1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/* SCTP kernel implementation
3	* (C) Copyright IBM Corp. 2001, 2004
4	* Copyright (c) 1999-2000 Cisco, Inc.
5	* Copyright (c) 1999-2001 Motorola, Inc.
6	* Copyright (c) 2001-2003 Intel Corp.
7	* Copyright (c) 2001-2002 Nokia, Inc.
8	* Copyright (c) 2001 La Monte H.P. Yarroll
9	*
10	* This file is part of the SCTP kernel implementation
11	*
12	* These functions interface with the sockets layer to implement the
13	* SCTP Extensions for the Sockets API.
14	*
15	* Note that the descriptions from the specification are USER level
16	* functions--this file is the functions which populate the struct proto
17	* for SCTP which is the BOTTOM of the sockets interface.
18	*
19	* Please send any bug reports or fixes you make to the
20	* email address(es):
21	* lksctp developers <linux-sctp@vger.kernel.org>
22	*
23	* Written or modified by:
24	* La Monte H.P. Yarroll <piggy@acm.org>
25	* Narasimha Budihal <narsi@refcode.org>
26	* Karl Knutson <karl@athena.chicago.il.us>
27	* Jon Grimm <jgrimm@us.ibm.com>
28	* Xingang Guo <xingang.guo@intel.com>
29	* Daisy Chang <daisyc@us.ibm.com>
30	* Sridhar Samudrala <samudrala@us.ibm.com>
31	* Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32	* Ardelle Fan <ardelle.fan@intel.com>
33	* Ryan Layer <rmlayer@us.ibm.com>
34	* Anup Pemmaiah <pemmaiah@cc.usu.edu>
35	* Kevin Gao <kevin.gao@intel.com>
36	*/
37
38	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40	#include <crypto/hash.h>
41	#include <linux/types.h>
42	#include <linux/kernel.h>
43	#include <linux/wait.h>
44	#include <linux/time.h>
45	#include <linux/sched/signal.h>
46	#include <linux/ip.h>
47	#include <linux/capability.h>
48	#include <linux/fcntl.h>
49	#include <linux/poll.h>
50	#include <linux/init.h>
51	#include <linux/slab.h>
52	#include <linux/file.h>
53	#include <linux/compat.h>
54	#include <linux/rhashtable.h>
55
56	#include <net/ip.h>
57	#include <net/icmp.h>
58	#include <net/route.h>
59	#include <net/ipv6.h>
60	#include <net/inet_common.h>
61	#include <net/busy_poll.h>
62	#include <trace/events/sock.h>
63
64	#include <linux/socket.h> /* for sa_family_t */
65	#include <linux/export.h>
66	#include <net/sock.h>
67	#include <net/sctp/sctp.h>
68	#include <net/sctp/sm.h>
69	#include <net/sctp/stream_sched.h>
70
71	/* Forward declarations for internal helper functions. */
72	static bool sctp_writeable(const struct sock *sk);
73	static void sctp_wfree(struct sk_buff *skb);
74	static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
75	size_t msg_len);
76	static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
77	static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
78	static int sctp_wait_for_accept(struct sock *sk, long timeo);
79	static void sctp_wait_for_close(struct sock *sk, long timeo);
80	static void sctp_destruct_sock(struct sock *sk);
81	static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
82	union sctp_addr *addr, int len);
83	static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
84	static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
85	static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
86	static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
87	static int sctp_send_asconf(struct sctp_association *asoc,
88	struct sctp_chunk *chunk);
89	static int sctp_do_bind(struct sock *, union sctp_addr *, int);
90	static int sctp_autobind(struct sock *sk);
91	static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
92	struct sctp_association *assoc,
93	enum sctp_socket_type type);
94
95	static unsigned long sctp_memory_pressure;
96	static atomic_long_t sctp_memory_allocated;
97	static DEFINE_PER_CPU(int, sctp_memory_per_cpu_fw_alloc);
98	struct percpu_counter sctp_sockets_allocated;
99
100	static void sctp_enter_memory_pressure(struct sock *sk)
101	{
102	WRITE_ONCE(sctp_memory_pressure, 1);
103	}
104
105
106	/* Get the sndbuf space available at the time on the association. */
107	static inline int sctp_wspace(struct sctp_association *asoc)
108	{
109	struct sock *sk = asoc->base.sk;
110
111	return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
112	: sk_stream_wspace(sk);
113	}
114
115	/* Increment the used sndbuf space count of the corresponding association by
116	* the size of the outgoing data chunk.
117	* Also, set the skb destructor for sndbuf accounting later.
118	*
119	* Since it is always 1-1 between chunk and skb, and also a new skb is always
120	* allocated for chunk bundling in sctp_packet_transmit(), we can use the
121	* destructor in the data chunk skb for the purpose of the sndbuf space
122	* tracking.
123	*/
124	static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
125	{
126	struct sctp_association *asoc = chunk->asoc;
127	struct sock *sk = asoc->base.sk;
128
129	/* The sndbuf space is tracked per association. */
130	sctp_association_hold(asoc);
131
132	if (chunk->shkey)
133	sctp_auth_shkey_hold(sh_key: chunk->shkey);
134
135	skb_set_owner_w(skb: chunk->skb, sk);
136
137	chunk->skb->destructor = sctp_wfree;
138	/* Save the chunk pointer in skb for sctp_wfree to use later. */
139	skb_shinfo(chunk->skb)->destructor_arg = chunk;
140
141	refcount_add(i: sizeof(struct sctp_chunk), r: &sk->sk_wmem_alloc);
142	asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
143	sk_wmem_queued_add(sk, val: chunk->skb->truesize + sizeof(struct sctp_chunk));
144	sk_mem_charge(sk, size: chunk->skb->truesize);
145	}
146
147	static void sctp_clear_owner_w(struct sctp_chunk *chunk)
148	{
149	skb_orphan(skb: chunk->skb);
150	}
151
152	#define traverse_and_process() \
153	do { \
154	msg = chunk->msg; \
155	if (msg == prev_msg) \
156	continue; \
157	list_for_each_entry(c, &msg->chunks, frag_list) { \
158	if ((clear && asoc->base.sk == c->skb->sk) || \
159	(!clear && asoc->base.sk != c->skb->sk)) \
160	cb(c); \
161	} \
162	prev_msg = msg; \
163	} while (0)
164
165	static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
166	bool clear,
167	void (*cb)(struct sctp_chunk *))
168
169	{
170	struct sctp_datamsg *msg, *prev_msg = NULL;
171	struct sctp_outq *q = &asoc->outqueue;
172	struct sctp_chunk *chunk, *c;
173	struct sctp_transport *t;
174
175	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
176	list_for_each_entry(chunk, &t->transmitted, transmitted_list)
177	traverse_and_process();
178
179	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
180	traverse_and_process();
181
182	list_for_each_entry(chunk, &q->sacked, transmitted_list)
183	traverse_and_process();
184
185	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
186	traverse_and_process();
187
188	list_for_each_entry(chunk, &q->out_chunk_list, list)
189	traverse_and_process();
190	}
191
192	static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
193	void (*cb)(struct sk_buff *, struct sock *))
194
195	{
196	struct sk_buff *skb, *tmp;
197
198	sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
199	cb(skb, sk);
200
201	sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
202	cb(skb, sk);
203
204	sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
205	cb(skb, sk);
206	}
207
208	/* Verify that this is a valid address. */
209	static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
210	int len)
211	{
212	struct sctp_af *af;
213
214	/* Verify basic sockaddr. */
215	af = sctp_sockaddr_af(opt: sctp_sk(sk), addr, len);
216	if (!af)
217	return -EINVAL;
218
219	/* Is this a valid SCTP address? */
220	if (!af->addr_valid(addr, sctp_sk(sk), NULL))
221	return -EINVAL;
222
223	if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
224	return -EINVAL;
225
226	return 0;
227	}
228
229	/* Look up the association by its id. If this is not a UDP-style
230	* socket, the ID field is always ignored.
231	*/
232	struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
233	{
234	struct sctp_association *asoc = NULL;
235
236	/* If this is not a UDP-style socket, assoc id should be ignored. */
237	if (!sctp_style(sk, UDP)) {
238	/* Return NULL if the socket state is not ESTABLISHED. It
239	* could be a TCP-style listening socket or a socket which
240	* hasn't yet called connect() to establish an association.
241	*/
242	if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
243	return NULL;
244
245	/* Get the first and the only association from the list. */
246	if (!list_empty(head: &sctp_sk(sk)->ep->asocs))
247	asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
248	struct sctp_association, asocs);
249	return asoc;
250	}
251
252	/* Otherwise this is a UDP-style socket. */
253	if (id <= SCTP_ALL_ASSOC)
254	return NULL;
255
256	spin_lock_bh(lock: &sctp_assocs_id_lock);
257	asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, id: (int)id);
258	if (asoc && (asoc->base.sk != sk || asoc->base.dead))
259	asoc = NULL;
260	spin_unlock_bh(lock: &sctp_assocs_id_lock);
261
262	return asoc;
263	}
264
265	/* Look up the transport from an address and an assoc id. If both address and
266	* id are specified, the associations matching the address and the id should be
267	* the same.
268	*/
269	static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
270	struct sockaddr_storage *addr,
271	sctp_assoc_t id)
272	{
273	struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
274	struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
275	union sctp_addr *laddr = (union sctp_addr *)addr;
276	struct sctp_transport *transport;
277
278	if (!af || sctp_verify_addr(sk, addr: laddr, len: af->sockaddr_len))
279	return NULL;
280
281	addr_asoc = sctp_endpoint_lookup_assoc(ep: sctp_sk(sk)->ep,
282	paddr: laddr,
283	&transport);
284
285	if (!addr_asoc)
286	return NULL;
287
288	id_asoc = sctp_id2assoc(sk, id);
289	if (id_asoc && (id_asoc != addr_asoc))
290	return NULL;
291
292	sctp_get_pf_specific(family: sk->sk_family)->addr_to_user(sctp_sk(sk),
293	(union sctp_addr *)addr);
294
295	return transport;
296	}
297
298	/* API 3.1.2 bind() - UDP Style Syntax
299	* The syntax of bind() is,
300	*
301	* ret = bind(int sd, struct sockaddr *addr, int addrlen);
302	*
303	* sd - the socket descriptor returned by socket().
304	* addr - the address structure (struct sockaddr_in or struct
305	* sockaddr_in6 [RFC 2553]),
306	* addr_len - the size of the address structure.
307	*/
308	static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
309	{
310	int retval = 0;
311
312	lock_sock(sk);
313
314	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
315	addr, addr_len);
316
317	/* Disallow binding twice. */
318	if (!sctp_sk(sk)->ep->base.bind_addr.port)
319	retval = sctp_do_bind(sk, (union sctp_addr *)addr,
320	addr_len);
321	else
322	retval = -EINVAL;
323
324	release_sock(sk);
325
326	return retval;
327	}
328
329	static int sctp_get_port_local(struct sock *, union sctp_addr *);
330
331	/* Verify this is a valid sockaddr. */
332	static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
333	union sctp_addr *addr, int len)
334	{
335	struct sctp_af *af;
336
337	/* Check minimum size. */
338	if (len < sizeof (struct sockaddr))
339	return NULL;
340
341	if (!opt->pf->af_supported(addr->sa.sa_family, opt))
342	return NULL;
343
344	if (addr->sa.sa_family == AF_INET6) {
345	if (len < SIN6_LEN_RFC2133)
346	return NULL;
347	/* V4 mapped address are really of AF_INET family */
348	if (ipv6_addr_v4mapped(a: &addr->v6.sin6_addr) &&
349	!opt->pf->af_supported(AF_INET, opt))
350	return NULL;
351	}
352
353	/* If we get this far, af is valid. */
354	af = sctp_get_af_specific(addr->sa.sa_family);
355
356	if (len < af->sockaddr_len)
357	return NULL;
358
359	return af;
360	}
361
362	static void sctp_auto_asconf_init(struct sctp_sock *sp)
363	{
364	struct net *net = sock_net(sk: &sp->inet.sk);
365
366	if (net->sctp.default_auto_asconf) {
367	spin_lock_bh(lock: &net->sctp.addr_wq_lock);
368	list_add_tail(new: &sp->auto_asconf_list, head: &net->sctp.auto_asconf_splist);
369	spin_unlock_bh(lock: &net->sctp.addr_wq_lock);
370	sp->do_auto_asconf = 1;
371	}
372	}
373
374	/* Bind a local address either to an endpoint or to an association. */
375	static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
376	{
377	struct net *net = sock_net(sk);
378	struct sctp_sock *sp = sctp_sk(sk);
379	struct sctp_endpoint *ep = sp->ep;
380	struct sctp_bind_addr *bp = &ep->base.bind_addr;
381	struct sctp_af *af;
382	unsigned short snum;
383	int ret = 0;
384
385	/* Common sockaddr verification. */
386	af = sctp_sockaddr_af(opt: sp, addr, len);
387	if (!af) {
388	pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
389	__func__, sk, addr, len);
390	return -EINVAL;
391	}
392
393	snum = ntohs(addr->v4.sin_port);
394
395	pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
396	__func__, sk, &addr->sa, bp->port, snum, len);
397
398	/* PF specific bind() address verification. */
399	if (!sp->pf->bind_verify(sp, addr))
400	return -EADDRNOTAVAIL;
401
402	/* We must either be unbound, or bind to the same port.
403	* It's OK to allow 0 ports if we are already bound.
404	* We'll just inhert an already bound port in this case
405	*/
406	if (bp->port) {
407	if (!snum)
408	snum = bp->port;
409	else if (snum != bp->port) {
410	pr_debug("%s: new port %d doesn't match existing port "
411	"%d\n", __func__, snum, bp->port);
412	return -EINVAL;
413	}
414	}
415
416	if (snum && inet_port_requires_bind_service(net, port: snum) &&
417	!ns_capable(ns: net->user_ns, CAP_NET_BIND_SERVICE))
418	return -EACCES;
419
420	/* See if the address matches any of the addresses we may have
421	* already bound before checking against other endpoints.
422	*/
423	if (sctp_bind_addr_match(bp, addr, sp))
424	return -EINVAL;
425
426	/* Make sure we are allowed to bind here.
427	* The function sctp_get_port_local() does duplicate address
428	* detection.
429	*/
430	addr->v4.sin_port = htons(snum);
431	if (sctp_get_port_local(sk, addr))
432	return -EADDRINUSE;
433
434	/* Refresh ephemeral port. */
435	if (!bp->port) {
436	bp->port = inet_sk(sk)->inet_num;
437	sctp_auto_asconf_init(sp);
438	}
439
440	/* Add the address to the bind address list.
441	* Use GFP_ATOMIC since BHs will be disabled.
442	*/
443	ret = sctp_add_bind_addr(bp, addr, new_size: af->sockaddr_len,
444	addr_state: SCTP_ADDR_SRC, GFP_ATOMIC);
445
446	if (ret) {
447	sctp_put_port(sk);
448	return ret;
449	}
450	/* Copy back into socket for getsockname() use. */
451	inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
452	sp->pf->to_sk_saddr(addr, sk);
453
454	return ret;
455	}
456
457	/* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
458	*
459	* R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
460	* at any one time. If a sender, after sending an ASCONF chunk, decides
461	* it needs to transfer another ASCONF Chunk, it MUST wait until the
462	* ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
463	* subsequent ASCONF. Note this restriction binds each side, so at any
464	* time two ASCONF may be in-transit on any given association (one sent
465	* from each endpoint).
466	*/
467	static int sctp_send_asconf(struct sctp_association *asoc,
468	struct sctp_chunk *chunk)
469	{
470	int retval = 0;
471
472	/* If there is an outstanding ASCONF chunk, queue it for later
473	* transmission.
474	*/
475	if (asoc->addip_last_asconf) {
476	list_add_tail(new: &chunk->list, head: &asoc->addip_chunk_list);
477	goto out;
478	}
479
480	/* Hold the chunk until an ASCONF_ACK is received. */
481	sctp_chunk_hold(chunk);
482	retval = sctp_primitive_ASCONF(asoc->base.net, asoc, arg: chunk);
483	if (retval)
484	sctp_chunk_free(chunk);
485	else
486	asoc->addip_last_asconf = chunk;
487
488	out:
489	return retval;
490	}
491
492	/* Add a list of addresses as bind addresses to local endpoint or
493	* association.
494	*
495	* Basically run through each address specified in the addrs/addrcnt
496	* array/length pair, determine if it is IPv6 or IPv4 and call
497	* sctp_do_bind() on it.
498	*
499	* If any of them fails, then the operation will be reversed and the
500	* ones that were added will be removed.
501	*
502	* Only sctp_setsockopt_bindx() is supposed to call this function.
503	*/
504	static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
505	{
506	int cnt;
507	int retval = 0;
508	void *addr_buf;
509	struct sockaddr *sa_addr;
510	struct sctp_af *af;
511
512	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
513	addrs, addrcnt);
514
515	addr_buf = addrs;
516	for (cnt = 0; cnt < addrcnt; cnt++) {
517	/* The list may contain either IPv4 or IPv6 address;
518	* determine the address length for walking thru the list.
519	*/
520	sa_addr = addr_buf;
521	af = sctp_get_af_specific(sa_addr->sa_family);
522	if (!af) {
523	retval = -EINVAL;
524	goto err_bindx_add;
525	}
526
527	retval = sctp_do_bind(sk, addr: (union sctp_addr *)sa_addr,
528	len: af->sockaddr_len);
529
530	addr_buf += af->sockaddr_len;
531
532	err_bindx_add:
533	if (retval < 0) {
534	/* Failed. Cleanup the ones that have been added */
535	if (cnt > 0)
536	sctp_bindx_rem(sk, addrs, cnt);
537	return retval;
538	}
539	}
540
541	return retval;
542	}
543
544	/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
545	* associations that are part of the endpoint indicating that a list of local
546	* addresses are added to the endpoint.
547	*
548	* If any of the addresses is already in the bind address list of the
549	* association, we do not send the chunk for that association. But it will not
550	* affect other associations.
551	*
552	* Only sctp_setsockopt_bindx() is supposed to call this function.
553	*/
554	static int sctp_send_asconf_add_ip(struct sock *sk,
555	struct sockaddr *addrs,
556	int addrcnt)
557	{
558	struct sctp_sock *sp;
559	struct sctp_endpoint *ep;
560	struct sctp_association *asoc;
561	struct sctp_bind_addr *bp;
562	struct sctp_chunk *chunk;
563	struct sctp_sockaddr_entry *laddr;
564	union sctp_addr *addr;
565	union sctp_addr saveaddr;
566	void *addr_buf;
567	struct sctp_af *af;
568	struct list_head *p;
569	int i;
570	int retval = 0;
571
572	sp = sctp_sk(sk);
573	ep = sp->ep;
574
575	if (!ep->asconf_enable)
576	return retval;
577
578	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
579	__func__, sk, addrs, addrcnt);
580
581	list_for_each_entry(asoc, &ep->asocs, asocs) {
582	if (!asoc->peer.asconf_capable)
583	continue;
584
585	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
586	continue;
587
588	if (!sctp_state(asoc, ESTABLISHED))
589	continue;
590
591	/* Check if any address in the packed array of addresses is
592	* in the bind address list of the association. If so,
593	* do not send the asconf chunk to its peer, but continue with
594	* other associations.
595	*/
596	addr_buf = addrs;
597	for (i = 0; i < addrcnt; i++) {
598	addr = addr_buf;
599	af = sctp_get_af_specific(addr->v4.sin_family);
600	if (!af) {
601	retval = -EINVAL;
602	goto out;
603	}
604
605	if (sctp_assoc_lookup_laddr(asoc, laddr: addr))
606	break;
607
608	addr_buf += af->sockaddr_len;
609	}
610	if (i < addrcnt)
611	continue;
612
613	/* Use the first valid address in bind addr list of
614	* association as Address Parameter of ASCONF CHUNK.
615	*/
616	bp = &asoc->base.bind_addr;
617	p = bp->address_list.next;
618	laddr = list_entry(p, struct sctp_sockaddr_entry, list);
619	chunk = sctp_make_asconf_update_ip(asoc, laddr: &laddr->a, addrs,
620	addrcnt, flags: SCTP_PARAM_ADD_IP);
621	if (!chunk) {
622	retval = -ENOMEM;
623	goto out;
624	}
625
626	/* Add the new addresses to the bind address list with
627	* use_as_src set to 0.
628	*/
629	addr_buf = addrs;
630	for (i = 0; i < addrcnt; i++) {
631	addr = addr_buf;
632	af = sctp_get_af_specific(addr->v4.sin_family);
633	memcpy(&saveaddr, addr, af->sockaddr_len);
634	retval = sctp_add_bind_addr(bp, &saveaddr,
635	new_size: sizeof(saveaddr),
636	addr_state: SCTP_ADDR_NEW, GFP_ATOMIC);
637	addr_buf += af->sockaddr_len;
638	}
639	if (asoc->src_out_of_asoc_ok) {
640	struct sctp_transport *trans;
641
642	list_for_each_entry(trans,
643	&asoc->peer.transport_addr_list, transports) {
644	trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
645	2*asoc->pathmtu, 4380));
646	trans->ssthresh = asoc->peer.i.a_rwnd;
647	trans->rto = asoc->rto_initial;
648	sctp_max_rto(asoc, trans);
649	trans->rtt = trans->srtt = trans->rttvar = 0;
650	/* Clear the source and route cache */
651	sctp_transport_route(trans, NULL,
652	sctp_sk(sk: asoc->base.sk));
653	}
654	}
655	retval = sctp_send_asconf(asoc, chunk);
656	}
657
658	out:
659	return retval;
660	}
661
662	/* Remove a list of addresses from bind addresses list. Do not remove the
663	* last address.
664	*
665	* Basically run through each address specified in the addrs/addrcnt
666	* array/length pair, determine if it is IPv6 or IPv4 and call
667	* sctp_del_bind() on it.
668	*
669	* If any of them fails, then the operation will be reversed and the
670	* ones that were removed will be added back.
671	*
672	* At least one address has to be left; if only one address is
673	* available, the operation will return -EBUSY.
674	*
675	* Only sctp_setsockopt_bindx() is supposed to call this function.
676	*/
677	static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
678	{
679	struct sctp_sock *sp = sctp_sk(sk);
680	struct sctp_endpoint *ep = sp->ep;
681	int cnt;
682	struct sctp_bind_addr *bp = &ep->base.bind_addr;
683	int retval = 0;
684	void *addr_buf;
685	union sctp_addr *sa_addr;
686	struct sctp_af *af;
687
688	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
689	__func__, sk, addrs, addrcnt);
690
691	addr_buf = addrs;
692	for (cnt = 0; cnt < addrcnt; cnt++) {
693	/* If the bind address list is empty or if there is only one
694	* bind address, there is nothing more to be removed (we need
695	* at least one address here).
696	*/
697	if (list_empty(head: &bp->address_list) ||
698	(sctp_list_single_entry(head: &bp->address_list))) {
699	retval = -EBUSY;
700	goto err_bindx_rem;
701	}
702
703	sa_addr = addr_buf;
704	af = sctp_get_af_specific(sa_addr->sa.sa_family);
705	if (!af) {
706	retval = -EINVAL;
707	goto err_bindx_rem;
708	}
709
710	if (!af->addr_valid(sa_addr, sp, NULL)) {
711	retval = -EADDRNOTAVAIL;
712	goto err_bindx_rem;
713	}
714
715	if (sa_addr->v4.sin_port &&
716	sa_addr->v4.sin_port != htons(bp->port)) {
717	retval = -EINVAL;
718	goto err_bindx_rem;
719	}
720
721	if (!sa_addr->v4.sin_port)
722	sa_addr->v4.sin_port = htons(bp->port);
723
724	/* FIXME - There is probably a need to check if sk->sk_saddr and
725	* sk->sk_rcv_addr are currently set to one of the addresses to
726	* be removed. This is something which needs to be looked into
727	* when we are fixing the outstanding issues with multi-homing
728	* socket routing and failover schemes. Refer to comments in
729	* sctp_do_bind(). -daisy
730	*/
731	retval = sctp_del_bind_addr(bp, sa_addr);
732
733	addr_buf += af->sockaddr_len;
734	err_bindx_rem:
735	if (retval < 0) {
736	/* Failed. Add the ones that has been removed back */
737	if (cnt > 0)
738	sctp_bindx_add(sk, addrs, addrcnt: cnt);
739	return retval;
740	}
741	}
742
743	return retval;
744	}
745
746	/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
747	* the associations that are part of the endpoint indicating that a list of
748	* local addresses are removed from the endpoint.
749	*
750	* If any of the addresses is already in the bind address list of the
751	* association, we do not send the chunk for that association. But it will not
752	* affect other associations.
753	*
754	* Only sctp_setsockopt_bindx() is supposed to call this function.
755	*/
756	static int sctp_send_asconf_del_ip(struct sock *sk,
757	struct sockaddr *addrs,
758	int addrcnt)
759	{
760	struct sctp_sock *sp;
761	struct sctp_endpoint *ep;
762	struct sctp_association *asoc;
763	struct sctp_transport *transport;
764	struct sctp_bind_addr *bp;
765	struct sctp_chunk *chunk;
766	union sctp_addr *laddr;
767	void *addr_buf;
768	struct sctp_af *af;
769	struct sctp_sockaddr_entry *saddr;
770	int i;
771	int retval = 0;
772	int stored = 0;
773
774	chunk = NULL;
775	sp = sctp_sk(sk);
776	ep = sp->ep;
777
778	if (!ep->asconf_enable)
779	return retval;
780
781	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
782	__func__, sk, addrs, addrcnt);
783
784	list_for_each_entry(asoc, &ep->asocs, asocs) {
785
786	if (!asoc->peer.asconf_capable)
787	continue;
788
789	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
790	continue;
791
792	if (!sctp_state(asoc, ESTABLISHED))
793	continue;
794
795	/* Check if any address in the packed array of addresses is
796	* not present in the bind address list of the association.
797	* If so, do not send the asconf chunk to its peer, but
798	* continue with other associations.
799	*/
800	addr_buf = addrs;
801	for (i = 0; i < addrcnt; i++) {
802	laddr = addr_buf;
803	af = sctp_get_af_specific(laddr->v4.sin_family);
804	if (!af) {
805	retval = -EINVAL;
806	goto out;
807	}
808
809	if (!sctp_assoc_lookup_laddr(asoc, laddr))
810	break;
811
812	addr_buf += af->sockaddr_len;
813	}
814	if (i < addrcnt)
815	continue;
816
817	/* Find one address in the association's bind address list
818	* that is not in the packed array of addresses. This is to
819	* make sure that we do not delete all the addresses in the
820	* association.
821	*/
822	bp = &asoc->base.bind_addr;
823	laddr = sctp_find_unmatch_addr(bp, addrs: (union sctp_addr *)addrs,
824	addrcnt, opt: sp);
825	if ((laddr == NULL) && (addrcnt == 1)) {
826	if (asoc->asconf_addr_del_pending)
827	continue;
828	asoc->asconf_addr_del_pending =
829	kzalloc(size: sizeof(union sctp_addr), GFP_ATOMIC);
830	if (asoc->asconf_addr_del_pending == NULL) {
831	retval = -ENOMEM;
832	goto out;
833	}
834	asoc->asconf_addr_del_pending->sa.sa_family =
835	addrs->sa_family;
836	asoc->asconf_addr_del_pending->v4.sin_port =
837	htons(bp->port);
838	if (addrs->sa_family == AF_INET) {
839	struct sockaddr_in *sin;
840
841	sin = (struct sockaddr_in *)addrs;
842	asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
843	} else if (addrs->sa_family == AF_INET6) {
844	struct sockaddr_in6 *sin6;
845
846	sin6 = (struct sockaddr_in6 *)addrs;
847	asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
848	}
849
850	pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
851	__func__, asoc, &asoc->asconf_addr_del_pending->sa,
852	asoc->asconf_addr_del_pending);
853
854	asoc->src_out_of_asoc_ok = 1;
855	stored = 1;
856	goto skip_mkasconf;
857	}
858
859	if (laddr == NULL)
860	return -EINVAL;
861
862	/* We do not need RCU protection throughout this loop
863	* because this is done under a socket lock from the
864	* setsockopt call.
865	*/
866	chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
867	flags: SCTP_PARAM_DEL_IP);
868	if (!chunk) {
869	retval = -ENOMEM;
870	goto out;
871	}
872
873	skip_mkasconf:
874	/* Reset use_as_src flag for the addresses in the bind address
875	* list that are to be deleted.
876	*/
877	addr_buf = addrs;
878	for (i = 0; i < addrcnt; i++) {
879	laddr = addr_buf;
880	af = sctp_get_af_specific(laddr->v4.sin_family);
881	list_for_each_entry(saddr, &bp->address_list, list) {
882	if (sctp_cmp_addr_exact(ss1: &saddr->a, ss2: laddr))
883	saddr->state = SCTP_ADDR_DEL;
884	}
885	addr_buf += af->sockaddr_len;
886	}
887
888	/* Update the route and saddr entries for all the transports
889	* as some of the addresses in the bind address list are
890	* about to be deleted and cannot be used as source addresses.
891	*/
892	list_for_each_entry(transport, &asoc->peer.transport_addr_list,
893	transports) {
894	sctp_transport_route(transport, NULL,
895	sctp_sk(sk: asoc->base.sk));
896	}
897
898	if (stored)
899	/* We don't need to transmit ASCONF */
900	continue;
901	retval = sctp_send_asconf(asoc, chunk);
902	}
903	out:
904	return retval;
905	}
906
907	/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
908	int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
909	{
910	struct sock *sk = sctp_opt2sk(sp);
911	union sctp_addr *addr;
912	struct sctp_af *af;
913
914	/* It is safe to write port space in caller. */
915	addr = &addrw->a;
916	addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
917	af = sctp_get_af_specific(addr->sa.sa_family);
918	if (!af)
919	return -EINVAL;
920	if (sctp_verify_addr(sk, addr, len: af->sockaddr_len))
921	return -EINVAL;
922
923	if (addrw->state == SCTP_ADDR_NEW)
924	return sctp_send_asconf_add_ip(sk, addrs: (struct sockaddr *)addr, addrcnt: 1);
925	else
926	return sctp_send_asconf_del_ip(sk, addrs: (struct sockaddr *)addr, addrcnt: 1);
927	}
928
929	/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
930	*
931	* API 8.1
932	* int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
933	* int flags);
934	*
935	* If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
936	* If the sd is an IPv6 socket, the addresses passed can either be IPv4
937	* or IPv6 addresses.
938	*
939	* A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
940	* Section 3.1.2 for this usage.
941	*
942	* addrs is a pointer to an array of one or more socket addresses. Each
943	* address is contained in its appropriate structure (i.e. struct
944	* sockaddr_in or struct sockaddr_in6) the family of the address type
945	* must be used to distinguish the address length (note that this
946	* representation is termed a "packed array" of addresses). The caller
947	* specifies the number of addresses in the array with addrcnt.
948	*
949	* On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
950	* -1, and sets errno to the appropriate error code.
951	*
952	* For SCTP, the port given in each socket address must be the same, or
953	* sctp_bindx() will fail, setting errno to EINVAL.
954	*
955	* The flags parameter is formed from the bitwise OR of zero or more of
956	* the following currently defined flags:
957	*
958	* SCTP_BINDX_ADD_ADDR
959	*
960	* SCTP_BINDX_REM_ADDR
961	*
962	* SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
963	* association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
964	* addresses from the association. The two flags are mutually exclusive;
965	* if both are given, sctp_bindx() will fail with EINVAL. A caller may
966	* not remove all addresses from an association; sctp_bindx() will
967	* reject such an attempt with EINVAL.
968	*
969	* An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
970	* additional addresses with an endpoint after calling bind(). Or use
971	* sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
972	* socket is associated with so that no new association accepted will be
973	* associated with those addresses. If the endpoint supports dynamic
974	* address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
975	* endpoint to send the appropriate message to the peer to change the
976	* peers address lists.
977	*
978	* Adding and removing addresses from a connected association is
979	* optional functionality. Implementations that do not support this
980	* functionality should return EOPNOTSUPP.
981	*
982	* Basically do nothing but copying the addresses from user to kernel
983	* land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
984	* This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
985	* from userspace.
986	*
987	* On exit there is no need to do sockfd_put(), sys_setsockopt() does
988	* it.
989	*
990	* sk The sk of the socket
991	* addrs The pointer to the addresses
992	* addrssize Size of the addrs buffer
993	* op Operation to perform (add or remove, see the flags of
994	* sctp_bindx)
995	*
996	* Returns 0 if ok, <0 errno code on error.
997	*/
998	static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
999	int addrs_size, int op)
1000	{
1001	int err;
1002	int addrcnt = 0;
1003	int walk_size = 0;
1004	struct sockaddr *sa_addr;
1005	void *addr_buf = addrs;
1006	struct sctp_af *af;
1007
1008	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1009	__func__, sk, addr_buf, addrs_size, op);
1010
1011	if (unlikely(addrs_size <= 0))
1012	return -EINVAL;
1013
1014	/* Walk through the addrs buffer and count the number of addresses. */
1015	while (walk_size < addrs_size) {
1016	if (walk_size + sizeof(sa_family_t) > addrs_size)
1017	return -EINVAL;
1018
1019	sa_addr = addr_buf;
1020	af = sctp_get_af_specific(sa_addr->sa_family);
1021
1022	/* If the address family is not supported or if this address
1023	* causes the address buffer to overflow return EINVAL.
1024	*/
1025	if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1026	return -EINVAL;
1027	addrcnt++;
1028	addr_buf += af->sockaddr_len;
1029	walk_size += af->sockaddr_len;
1030	}
1031
1032	/* Do the work. */
1033	switch (op) {
1034	case SCTP_BINDX_ADD_ADDR:
1035	/* Allow security module to validate bindx addresses. */
1036	err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1037	address: addrs, addrlen: addrs_size);
1038	if (err)
1039	return err;
1040	err = sctp_bindx_add(sk, addrs, addrcnt);
1041	if (err)
1042	return err;
1043	return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1044	case SCTP_BINDX_REM_ADDR:
1045	err = sctp_bindx_rem(sk, addrs, addrcnt);
1046	if (err)
1047	return err;
1048	return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1049
1050	default:
1051	return -EINVAL;
1052	}
1053	}
1054
1055	static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1056	int addrlen)
1057	{
1058	int err;
1059
1060	lock_sock(sk);
1061	err = sctp_setsockopt_bindx(sk, addrs, addrs_size: addrlen, SCTP_BINDX_ADD_ADDR);
1062	release_sock(sk);
1063	return err;
1064	}
1065
1066	static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1067	const union sctp_addr *daddr,
1068	const struct sctp_initmsg *init,
1069	struct sctp_transport **tp)
1070	{
1071	struct sctp_association *asoc;
1072	struct sock *sk = ep->base.sk;
1073	struct net *net = sock_net(sk);
1074	enum sctp_scope scope;
1075	int err;
1076
1077	if (sctp_endpoint_is_peeled_off(ep, paddr: daddr))
1078	return -EADDRNOTAVAIL;
1079
1080	if (!ep->base.bind_addr.port) {
1081	if (sctp_autobind(sk))
1082	return -EAGAIN;
1083	} else {
1084	if (inet_port_requires_bind_service(net, port: ep->base.bind_addr.port) &&
1085	!ns_capable(ns: net->user_ns, CAP_NET_BIND_SERVICE))
1086	return -EACCES;
1087	}
1088
1089	scope = sctp_scope(addr: daddr);
1090	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1091	if (!asoc)
1092	return -ENOMEM;
1093
1094	err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1095	if (err < 0)
1096	goto free;
1097
1098	*tp = sctp_assoc_add_peer(asoc, address: daddr, GFP_KERNEL, peer_state: SCTP_UNKNOWN);
1099	if (!*tp) {
1100	err = -ENOMEM;
1101	goto free;
1102	}
1103
1104	if (!init)
1105	return 0;
1106
1107	if (init->sinit_num_ostreams) {
1108	__u16 outcnt = init->sinit_num_ostreams;
1109
1110	asoc->c.sinit_num_ostreams = outcnt;
1111	/* outcnt has been changed, need to re-init stream */
1112	err = sctp_stream_init(stream: &asoc->stream, outcnt, incnt: 0, GFP_KERNEL);
1113	if (err)
1114	goto free;
1115	}
1116
1117	if (init->sinit_max_instreams)
1118	asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1119
1120	if (init->sinit_max_attempts)
1121	asoc->max_init_attempts = init->sinit_max_attempts;
1122
1123	if (init->sinit_max_init_timeo)
1124	asoc->max_init_timeo =
1125	msecs_to_jiffies(m: init->sinit_max_init_timeo);
1126
1127	return 0;
1128	free:
1129	sctp_association_free(asoc);
1130	return err;
1131	}
1132
1133	static int sctp_connect_add_peer(struct sctp_association *asoc,
1134	union sctp_addr *daddr, int addr_len)
1135	{
1136	struct sctp_endpoint *ep = asoc->ep;
1137	struct sctp_association *old;
1138	struct sctp_transport *t;
1139	int err;
1140
1141	err = sctp_verify_addr(sk: ep->base.sk, addr: daddr, len: addr_len);
1142	if (err)
1143	return err;
1144
1145	old = sctp_endpoint_lookup_assoc(ep, paddr: daddr, &t);
1146	if (old && old != asoc)
1147	return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1148	: -EALREADY;
1149
1150	if (sctp_endpoint_is_peeled_off(ep, paddr: daddr))
1151	return -EADDRNOTAVAIL;
1152
1153	t = sctp_assoc_add_peer(asoc, address: daddr, GFP_KERNEL, peer_state: SCTP_UNKNOWN);
1154	if (!t)
1155	return -ENOMEM;
1156
1157	return 0;
1158	}
1159
1160	/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1161	*
1162	* Common routine for handling connect() and sctp_connectx().
1163	* Connect will come in with just a single address.
1164	*/
1165	static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1166	int addrs_size, int flags, sctp_assoc_t *assoc_id)
1167	{
1168	struct sctp_sock *sp = sctp_sk(sk);
1169	struct sctp_endpoint *ep = sp->ep;
1170	struct sctp_transport *transport;
1171	struct sctp_association *asoc;
1172	void *addr_buf = kaddrs;
1173	union sctp_addr *daddr;
1174	struct sctp_af *af;
1175	int walk_size, err;
1176	long timeo;
1177
1178	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1179	(sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1180	return -EISCONN;
1181
1182	daddr = addr_buf;
1183	af = sctp_get_af_specific(daddr->sa.sa_family);
1184	if (!af || af->sockaddr_len > addrs_size)
1185	return -EINVAL;
1186
1187	err = sctp_verify_addr(sk, addr: daddr, len: af->sockaddr_len);
1188	if (err)
1189	return err;
1190
1191	asoc = sctp_endpoint_lookup_assoc(ep, paddr: daddr, &transport);
1192	if (asoc)
1193	return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1194	: -EALREADY;
1195
1196	err = sctp_connect_new_asoc(ep, daddr, NULL, tp: &transport);
1197	if (err)
1198	return err;
1199	asoc = transport->asoc;
1200
1201	addr_buf += af->sockaddr_len;
1202	walk_size = af->sockaddr_len;
1203	while (walk_size < addrs_size) {
1204	err = -EINVAL;
1205	if (walk_size + sizeof(sa_family_t) > addrs_size)
1206	goto out_free;
1207
1208	daddr = addr_buf;
1209	af = sctp_get_af_specific(daddr->sa.sa_family);
1210	if (!af || af->sockaddr_len + walk_size > addrs_size)
1211	goto out_free;
1212
1213	if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1214	goto out_free;
1215
1216	err = sctp_connect_add_peer(asoc, daddr, addr_len: af->sockaddr_len);
1217	if (err)
1218	goto out_free;
1219
1220	addr_buf += af->sockaddr_len;
1221	walk_size += af->sockaddr_len;
1222	}
1223
1224	/* In case the user of sctp_connectx() wants an association
1225	* id back, assign one now.
1226	*/
1227	if (assoc_id) {
1228	err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1229	if (err < 0)
1230	goto out_free;
1231	}
1232
1233	err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1234	if (err < 0)
1235	goto out_free;
1236
1237	/* Initialize sk's dport and daddr for getpeername() */
1238	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1239	sp->pf->to_sk_daddr(daddr, sk);
1240	sk->sk_err = 0;
1241
1242	if (assoc_id)
1243	*assoc_id = asoc->assoc_id;
1244
1245	timeo = sock_sndtimeo(sk, noblock: flags & O_NONBLOCK);
1246	return sctp_wait_for_connect(asoc, timeo_p: &timeo);
1247
1248	out_free:
1249	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1250	__func__, asoc, kaddrs, err);
1251	sctp_association_free(asoc);
1252	return err;
1253	}
1254
1255	/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1256	*
1257	* API 8.9
1258	* int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1259	* sctp_assoc_t *asoc);
1260	*
1261	* If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1262	* If the sd is an IPv6 socket, the addresses passed can either be IPv4
1263	* or IPv6 addresses.
1264	*
1265	* A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1266	* Section 3.1.2 for this usage.
1267	*
1268	* addrs is a pointer to an array of one or more socket addresses. Each
1269	* address is contained in its appropriate structure (i.e. struct
1270	* sockaddr_in or struct sockaddr_in6) the family of the address type
1271	* must be used to distengish the address length (note that this
1272	* representation is termed a "packed array" of addresses). The caller
1273	* specifies the number of addresses in the array with addrcnt.
1274	*
1275	* On success, sctp_connectx() returns 0. It also sets the assoc_id to
1276	* the association id of the new association. On failure, sctp_connectx()
1277	* returns -1, and sets errno to the appropriate error code. The assoc_id
1278	* is not touched by the kernel.
1279	*
1280	* For SCTP, the port given in each socket address must be the same, or
1281	* sctp_connectx() will fail, setting errno to EINVAL.
1282	*
1283	* An application can use sctp_connectx to initiate an association with
1284	* an endpoint that is multi-homed. Much like sctp_bindx() this call
1285	* allows a caller to specify multiple addresses at which a peer can be
1286	* reached. The way the SCTP stack uses the list of addresses to set up
1287	* the association is implementation dependent. This function only
1288	* specifies that the stack will try to make use of all the addresses in
1289	* the list when needed.
1290	*
1291	* Note that the list of addresses passed in is only used for setting up
1292	* the association. It does not necessarily equal the set of addresses
1293	* the peer uses for the resulting association. If the caller wants to
1294	* find out the set of peer addresses, it must use sctp_getpaddrs() to
1295	* retrieve them after the association has been set up.
1296	*
1297	* Basically do nothing but copying the addresses from user to kernel
1298	* land and invoking either sctp_connectx(). This is used for tunneling
1299	* the sctp_connectx() request through sctp_setsockopt() from userspace.
1300	*
1301	* On exit there is no need to do sockfd_put(), sys_setsockopt() does
1302	* it.
1303	*
1304	* sk The sk of the socket
1305	* addrs The pointer to the addresses
1306	* addrssize Size of the addrs buffer
1307	*
1308	* Returns >=0 if ok, <0 errno code on error.
1309	*/
1310	static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1311	int addrs_size, sctp_assoc_t *assoc_id)
1312	{
1313	int err = 0, flags = 0;
1314
1315	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1316	__func__, sk, kaddrs, addrs_size);
1317
1318	/* make sure the 1st addr's sa_family is accessible later */
1319	if (unlikely(addrs_size < sizeof(sa_family_t)))
1320	return -EINVAL;
1321
1322	/* Allow security module to validate connectx addresses. */
1323	err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1324	address: (struct sockaddr *)kaddrs,
1325	addrlen: addrs_size);
1326	if (err)
1327	return err;
1328
1329	/* in-kernel sockets don't generally have a file allocated to them
1330	* if all they do is call sock_create_kern().
1331	*/
1332	if (sk->sk_socket->file)
1333	flags = sk->sk_socket->file->f_flags;
1334
1335	return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1336	}
1337
1338	/*
1339	* This is an older interface. It's kept for backward compatibility
1340	* to the option that doesn't provide association id.
1341	*/
1342	static int sctp_setsockopt_connectx_old(struct sock *sk,
1343	struct sockaddr *kaddrs,
1344	int addrs_size)
1345	{
1346	return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1347	}
1348
1349	/*
1350	* New interface for the API. The since the API is done with a socket
1351	* option, to make it simple we feed back the association id is as a return
1352	* indication to the call. Error is always negative and association id is
1353	* always positive.
1354	*/
1355	static int sctp_setsockopt_connectx(struct sock *sk,
1356	struct sockaddr *kaddrs,
1357	int addrs_size)
1358	{
1359	sctp_assoc_t assoc_id = 0;
1360	int err = 0;
1361
1362	err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, assoc_id: &assoc_id);
1363
1364	if (err)
1365	return err;
1366	else
1367	return assoc_id;
1368	}
1369
1370	/*
1371	* New (hopefully final) interface for the API.
1372	* We use the sctp_getaddrs_old structure so that use-space library
1373	* can avoid any unnecessary allocations. The only different part
1374	* is that we store the actual length of the address buffer into the
1375	* addrs_num structure member. That way we can re-use the existing
1376	* code.
1377	*/
1378	#ifdef CONFIG_COMPAT
1379	struct compat_sctp_getaddrs_old {
1380	sctp_assoc_t assoc_id;
1381	s32 addr_num;
1382	compat_uptr_t addrs; /* struct sockaddr * */
1383	};
1384	#endif
1385
1386	static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1387	char __user *optval,
1388	int __user *optlen)
1389	{
1390	struct sctp_getaddrs_old param;
1391	sctp_assoc_t assoc_id = 0;
1392	struct sockaddr *kaddrs;
1393	int err = 0;
1394
1395	#ifdef CONFIG_COMPAT
1396	if (in_compat_syscall()) {
1397	struct compat_sctp_getaddrs_old param32;
1398
1399	if (len < sizeof(param32))
1400	return -EINVAL;
1401	if (copy_from_user(to: &param32, from: optval, n: sizeof(param32)))
1402	return -EFAULT;
1403
1404	param.assoc_id = param32.assoc_id;
1405	param.addr_num = param32.addr_num;
1406	param.addrs = compat_ptr(uptr: param32.addrs);
1407	} else
1408	#endif
1409	{
1410	if (len < sizeof(param))
1411	return -EINVAL;
1412	if (copy_from_user(to: &param, from: optval, n: sizeof(param)))
1413	return -EFAULT;
1414	}
1415
1416	kaddrs = memdup_user(param.addrs, param.addr_num);
1417	if (IS_ERR(ptr: kaddrs))
1418	return PTR_ERR(ptr: kaddrs);
1419
1420	err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size: param.addr_num, assoc_id: &assoc_id);
1421	kfree(objp: kaddrs);
1422	if (err == 0 || err == -EINPROGRESS) {
1423	if (copy_to_user(to: optval, from: &assoc_id, n: sizeof(assoc_id)))
1424	return -EFAULT;
1425	if (put_user(sizeof(assoc_id), optlen))
1426	return -EFAULT;
1427	}
1428
1429	return err;
1430	}
1431
1432	/* API 3.1.4 close() - UDP Style Syntax
1433	* Applications use close() to perform graceful shutdown (as described in
1434	* Section 10.1 of [SCTP]) on ALL the associations currently represented
1435	* by a UDP-style socket.
1436	*
1437	* The syntax is
1438	*
1439	* ret = close(int sd);
1440	*
1441	* sd - the socket descriptor of the associations to be closed.
1442	*
1443	* To gracefully shutdown a specific association represented by the
1444	* UDP-style socket, an application should use the sendmsg() call,
1445	* passing no user data, but including the appropriate flag in the
1446	* ancillary data (see Section xxxx).
1447	*
1448	* If sd in the close() call is a branched-off socket representing only
1449	* one association, the shutdown is performed on that association only.
1450	*
1451	* 4.1.6 close() - TCP Style Syntax
1452	*
1453	* Applications use close() to gracefully close down an association.
1454	*
1455	* The syntax is:
1456	*
1457	* int close(int sd);
1458	*
1459	* sd - the socket descriptor of the association to be closed.
1460	*
1461	* After an application calls close() on a socket descriptor, no further
1462	* socket operations will succeed on that descriptor.
1463	*
1464	* API 7.1.4 SO_LINGER
1465	*
1466	* An application using the TCP-style socket can use this option to
1467	* perform the SCTP ABORT primitive. The linger option structure is:
1468	*
1469	* struct linger {
1470	* int l_onoff; // option on/off
1471	* int l_linger; // linger time
1472	* };
1473	*
1474	* To enable the option, set l_onoff to 1. If the l_linger value is set
1475	* to 0, calling close() is the same as the ABORT primitive. If the
1476	* value is set to a negative value, the setsockopt() call will return
1477	* an error. If the value is set to a positive value linger_time, the
1478	* close() can be blocked for at most linger_time ms. If the graceful
1479	* shutdown phase does not finish during this period, close() will
1480	* return but the graceful shutdown phase continues in the system.
1481	*/
1482	static void sctp_close(struct sock *sk, long timeout)
1483	{
1484	struct net *net = sock_net(sk);
1485	struct sctp_endpoint *ep;
1486	struct sctp_association *asoc;
1487	struct list_head *pos, *temp;
1488	unsigned int data_was_unread;
1489
1490	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1491
1492	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1493	sk->sk_shutdown = SHUTDOWN_MASK;
1494	inet_sk_set_state(sk, state: SCTP_SS_CLOSING);
1495
1496	ep = sctp_sk(sk)->ep;
1497
1498	/* Clean up any skbs sitting on the receive queue. */
1499	data_was_unread = sctp_queue_purge_ulpevents(list: &sk->sk_receive_queue);
1500	data_was_unread += sctp_queue_purge_ulpevents(list: &sctp_sk(sk)->pd_lobby);
1501
1502	/* Walk all associations on an endpoint. */
1503	list_for_each_safe(pos, temp, &ep->asocs) {
1504	asoc = list_entry(pos, struct sctp_association, asocs);
1505
1506	if (sctp_style(sk, TCP)) {
1507	/* A closed association can still be in the list if
1508	* it belongs to a TCP-style listening socket that is
1509	* not yet accepted. If so, free it. If not, send an
1510	* ABORT or SHUTDOWN based on the linger options.
1511	*/
1512	if (sctp_state(asoc, CLOSED)) {
1513	sctp_association_free(asoc);
1514	continue;
1515	}
1516	}
1517
1518	if (data_was_unread || !skb_queue_empty(list: &asoc->ulpq.lobby) ||
1519	!skb_queue_empty(list: &asoc->ulpq.reasm) ||
1520	!skb_queue_empty(list: &asoc->ulpq.reasm_uo) ||
1521	(sock_flag(sk, flag: SOCK_LINGER) && !sk->sk_lingertime)) {
1522	struct sctp_chunk *chunk;
1523
1524	chunk = sctp_make_abort_user(asoc, NULL, msg_len: 0);
1525	sctp_primitive_ABORT(net, asoc, arg: chunk);
1526	} else
1527	sctp_primitive_SHUTDOWN(net, asoc, NULL);
1528	}
1529
1530	/* On a TCP-style socket, block for at most linger_time if set. */
1531	if (sctp_style(sk, TCP) && timeout)
1532	sctp_wait_for_close(sk, timeo: timeout);
1533
1534	/* This will run the backlog queue. */
1535	release_sock(sk);
1536
1537	/* Supposedly, no process has access to the socket, but
1538	* the net layers still may.
1539	* Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1540	* held and that should be grabbed before socket lock.
1541	*/
1542	spin_lock_bh(lock: &net->sctp.addr_wq_lock);
1543	bh_lock_sock_nested(sk);
1544
1545	/* Hold the sock, since sk_common_release() will put sock_put()
1546	* and we have just a little more cleanup.
1547	*/
1548	sock_hold(sk);
1549	sk_common_release(sk);
1550
1551	bh_unlock_sock(sk);
1552	spin_unlock_bh(lock: &net->sctp.addr_wq_lock);
1553
1554	sock_put(sk);
1555
1556	SCTP_DBG_OBJCNT_DEC(sock);
1557	}
1558
1559	/* Handle EPIPE error. */
1560	static int sctp_error(struct sock *sk, int flags, int err)
1561	{
1562	if (err == -EPIPE)
1563	err = sock_error(sk) ? : -EPIPE;
1564	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1565	send_sig(SIGPIPE, current, 0);
1566	return err;
1567	}
1568
1569	/* API 3.1.3 sendmsg() - UDP Style Syntax
1570	*
1571	* An application uses sendmsg() and recvmsg() calls to transmit data to
1572	* and receive data from its peer.
1573	*
1574	* ssize_t sendmsg(int socket, const struct msghdr *message,
1575	* int flags);
1576	*
1577	* socket - the socket descriptor of the endpoint.
1578	* message - pointer to the msghdr structure which contains a single
1579	* user message and possibly some ancillary data.
1580	*
1581	* See Section 5 for complete description of the data
1582	* structures.
1583	*
1584	* flags - flags sent or received with the user message, see Section
1585	* 5 for complete description of the flags.
1586	*
1587	* Note: This function could use a rewrite especially when explicit
1588	* connect support comes in.
1589	*/
1590	/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1591
1592	static int sctp_msghdr_parse(const struct msghdr *msg,
1593	struct sctp_cmsgs *cmsgs);
1594
1595	static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1596	struct sctp_sndrcvinfo *srinfo,
1597	const struct msghdr *msg, size_t msg_len)
1598	{
1599	__u16 sflags;
1600	int err;
1601
1602	if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1603	return -EPIPE;
1604
1605	if (msg_len > sk->sk_sndbuf)
1606	return -EMSGSIZE;
1607
1608	memset(cmsgs, 0, sizeof(*cmsgs));
1609	err = sctp_msghdr_parse(msg, cmsgs);
1610	if (err) {
1611	pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1612	return err;
1613	}
1614
1615	memset(srinfo, 0, sizeof(*srinfo));
1616	if (cmsgs->srinfo) {
1617	srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1618	srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1619	srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1620	srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1621	srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1622	srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1623	}
1624
1625	if (cmsgs->sinfo) {
1626	srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1627	srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1628	srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1629	srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1630	srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1631	}
1632
1633	if (cmsgs->prinfo) {
1634	srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1635	SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1636	cmsgs->prinfo->pr_policy);
1637	}
1638
1639	sflags = srinfo->sinfo_flags;
1640	if (!sflags && msg_len)
1641	return 0;
1642
1643	if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1644	return -EINVAL;
1645
1646	if (((sflags & SCTP_EOF) && msg_len > 0) ||
1647	(!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1648	return -EINVAL;
1649
1650	if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1651	return -EINVAL;
1652
1653	return 0;
1654	}
1655
1656	static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1657	struct sctp_cmsgs *cmsgs,
1658	union sctp_addr *daddr,
1659	struct sctp_transport **tp)
1660	{
1661	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1662	struct sctp_association *asoc;
1663	struct cmsghdr *cmsg;
1664	__be32 flowinfo = 0;
1665	struct sctp_af *af;
1666	int err;
1667
1668	*tp = NULL;
1669
1670	if (sflags & (SCTP_EOF | SCTP_ABORT))
1671	return -EINVAL;
1672
1673	if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1674	sctp_sstate(sk, CLOSING)))
1675	return -EADDRNOTAVAIL;
1676
1677	/* Label connection socket for first association 1-to-many
1678	* style for client sequence socket()->sendmsg(). This
1679	* needs to be done before sctp_assoc_add_peer() as that will
1680	* set up the initial packet that needs to account for any
1681	* security ip options (CIPSO/CALIPSO) added to the packet.
1682	*/
1683	af = sctp_get_af_specific(daddr->sa.sa_family);
1684	if (!af)
1685	return -EINVAL;
1686	err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1687	address: (struct sockaddr *)daddr,
1688	addrlen: af->sockaddr_len);
1689	if (err < 0)
1690	return err;
1691
1692	err = sctp_connect_new_asoc(ep, daddr, init: cmsgs->init, tp);
1693	if (err)
1694	return err;
1695	asoc = (*tp)->asoc;
1696
1697	if (!cmsgs->addrs_msg)
1698	return 0;
1699
1700	if (daddr->sa.sa_family == AF_INET6)
1701	flowinfo = daddr->v6.sin6_flowinfo;
1702
1703	/* sendv addr list parse */
1704	for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1705	union sctp_addr _daddr;
1706	int dlen;
1707
1708	if (cmsg->cmsg_level != IPPROTO_SCTP ||
1709	(cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1710	cmsg->cmsg_type != SCTP_DSTADDRV6))
1711	continue;
1712
1713	daddr = &_daddr;
1714	memset(daddr, 0, sizeof(*daddr));
1715	dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1716	if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1717	if (dlen < sizeof(struct in_addr)) {
1718	err = -EINVAL;
1719	goto free;
1720	}
1721
1722	dlen = sizeof(struct in_addr);
1723	daddr->v4.sin_family = AF_INET;
1724	daddr->v4.sin_port = htons(asoc->peer.port);
1725	memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1726	} else {
1727	if (dlen < sizeof(struct in6_addr)) {
1728	err = -EINVAL;
1729	goto free;
1730	}
1731
1732	dlen = sizeof(struct in6_addr);
1733	daddr->v6.sin6_flowinfo = flowinfo;
1734	daddr->v6.sin6_family = AF_INET6;
1735	daddr->v6.sin6_port = htons(asoc->peer.port);
1736	memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1737	}
1738
1739	err = sctp_connect_add_peer(asoc, daddr, addr_len: sizeof(*daddr));
1740	if (err)
1741	goto free;
1742	}
1743
1744	return 0;
1745
1746	free:
1747	sctp_association_free(asoc);
1748	return err;
1749	}
1750
1751	static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1752	__u16 sflags, struct msghdr *msg,
1753	size_t msg_len)
1754	{
1755	struct sock *sk = asoc->base.sk;
1756	struct net *net = sock_net(sk);
1757
1758	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1759	return -EPIPE;
1760
1761	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1762	!sctp_state(asoc, ESTABLISHED))
1763	return 0;
1764
1765	if (sflags & SCTP_EOF) {
1766	pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1767	sctp_primitive_SHUTDOWN(net, asoc, NULL);
1768
1769	return 0;
1770	}
1771
1772	if (sflags & SCTP_ABORT) {
1773	struct sctp_chunk *chunk;
1774
1775	chunk = sctp_make_abort_user(asoc, msg, msg_len);
1776	if (!chunk)
1777	return -ENOMEM;
1778
1779	pr_debug("%s: aborting association:%p\n", __func__, asoc);
1780	sctp_primitive_ABORT(net, asoc, arg: chunk);
1781	iov_iter_revert(i: &msg->msg_iter, bytes: msg_len);
1782
1783	return 0;
1784	}
1785
1786	return 1;
1787	}
1788
1789	static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1790	struct msghdr *msg, size_t msg_len,
1791	struct sctp_transport *transport,
1792	struct sctp_sndrcvinfo *sinfo)
1793	{
1794	struct sock *sk = asoc->base.sk;
1795	struct sctp_sock *sp = sctp_sk(sk);
1796	struct net *net = sock_net(sk);
1797	struct sctp_datamsg *datamsg;
1798	bool wait_connect = false;
1799	struct sctp_chunk *chunk;
1800	long timeo;
1801	int err;
1802
1803	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1804	err = -EINVAL;
1805	goto err;
1806	}
1807
1808	if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1809	err = sctp_stream_init_ext(stream: &asoc->stream, sid: sinfo->sinfo_stream);
1810	if (err)
1811	goto err;
1812	}
1813
1814	if (sp->disable_fragments && msg_len > asoc->frag_point) {
1815	err = -EMSGSIZE;
1816	goto err;
1817	}
1818
1819	if (asoc->pmtu_pending) {
1820	if (sp->param_flags & SPP_PMTUD_ENABLE)
1821	sctp_assoc_sync_pmtu(asoc);
1822	asoc->pmtu_pending = 0;
1823	}
1824
1825	if (sctp_wspace(asoc) < (int)msg_len)
1826	sctp_prsctp_prune(asoc, sinfo, msg_len: msg_len - sctp_wspace(asoc));
1827
1828	if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, size: msg_len)) {
1829	timeo = sock_sndtimeo(sk, noblock: msg->msg_flags & MSG_DONTWAIT);
1830	err = sctp_wait_for_sndbuf(asoc, timeo_p: &timeo, msg_len);
1831	if (err)
1832	goto err;
1833	if (unlikely(sinfo->sinfo_stream >= asoc->stream.outcnt)) {
1834	err = -EINVAL;
1835	goto err;
1836	}
1837	}
1838
1839	if (sctp_state(asoc, CLOSED)) {
1840	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1841	if (err)
1842	goto err;
1843
1844	if (asoc->ep->intl_enable) {
1845	timeo = sock_sndtimeo(sk, noblock: 0);
1846	err = sctp_wait_for_connect(asoc, timeo_p: &timeo);
1847	if (err) {
1848	err = -ESRCH;
1849	goto err;
1850	}
1851	} else {
1852	wait_connect = true;
1853	}
1854
1855	pr_debug("%s: we associated primitively\n", __func__);
1856	}
1857
1858	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1859	if (IS_ERR(ptr: datamsg)) {
1860	err = PTR_ERR(ptr: datamsg);
1861	goto err;
1862	}
1863
1864	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1865
1866	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1867	sctp_chunk_hold(chunk);
1868	sctp_set_owner_w(chunk);
1869	chunk->transport = transport;
1870	}
1871
1872	err = sctp_primitive_SEND(net, asoc, arg: datamsg);
1873	if (err) {
1874	sctp_datamsg_free(datamsg);
1875	goto err;
1876	}
1877
1878	pr_debug("%s: we sent primitively\n", __func__);
1879
1880	sctp_datamsg_put(datamsg);
1881
1882	if (unlikely(wait_connect)) {
1883	timeo = sock_sndtimeo(sk, noblock: msg->msg_flags & MSG_DONTWAIT);
1884	sctp_wait_for_connect(asoc, timeo_p: &timeo);
1885	}
1886
1887	err = msg_len;
1888
1889	err:
1890	return err;
1891	}
1892
1893	static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1894	const struct msghdr *msg,
1895	struct sctp_cmsgs *cmsgs)
1896	{
1897	union sctp_addr *daddr = NULL;
1898	int err;
1899
1900	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1901	int len = msg->msg_namelen;
1902
1903	if (len > sizeof(*daddr))
1904	len = sizeof(*daddr);
1905
1906	daddr = (union sctp_addr *)msg->msg_name;
1907
1908	err = sctp_verify_addr(sk, addr: daddr, len);
1909	if (err)
1910	return ERR_PTR(error: err);
1911	}
1912
1913	return daddr;
1914	}
1915
1916	static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1917	struct sctp_sndrcvinfo *sinfo,
1918	struct sctp_cmsgs *cmsgs)
1919	{
1920	if (!cmsgs->srinfo && !cmsgs->sinfo) {
1921	sinfo->sinfo_stream = asoc->default_stream;
1922	sinfo->sinfo_ppid = asoc->default_ppid;
1923	sinfo->sinfo_context = asoc->default_context;
1924	sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1925
1926	if (!cmsgs->prinfo)
1927	sinfo->sinfo_flags = asoc->default_flags;
1928	}
1929
1930	if (!cmsgs->srinfo && !cmsgs->prinfo)
1931	sinfo->sinfo_timetolive = asoc->default_timetolive;
1932
1933	if (cmsgs->authinfo) {
1934	/* Reuse sinfo_tsn to indicate that authinfo was set and
1935	* sinfo_ssn to save the keyid on tx path.
1936	*/
1937	sinfo->sinfo_tsn = 1;
1938	sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1939	}
1940	}
1941
1942	static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1943	{
1944	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1945	struct sctp_transport *transport = NULL;
1946	struct sctp_sndrcvinfo _sinfo, *sinfo;
1947	struct sctp_association *asoc, *tmp;
1948	struct sctp_cmsgs cmsgs;
1949	union sctp_addr *daddr;
1950	bool new = false;
1951	__u16 sflags;
1952	int err;
1953
1954	/* Parse and get snd_info */
1955	err = sctp_sendmsg_parse(sk, cmsgs: &cmsgs, srinfo: &_sinfo, msg, msg_len);
1956	if (err)
1957	goto out;
1958
1959	sinfo = &_sinfo;
1960	sflags = sinfo->sinfo_flags;
1961
1962	/* Get daddr from msg */
1963	daddr = sctp_sendmsg_get_daddr(sk, msg, cmsgs: &cmsgs);
1964	if (IS_ERR(ptr: daddr)) {
1965	err = PTR_ERR(ptr: daddr);
1966	goto out;
1967	}
1968
1969	lock_sock(sk);
1970
1971	/* SCTP_SENDALL process */
1972	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1973	list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1974	err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1975	msg_len);
1976	if (err == 0)
1977	continue;
1978	if (err < 0)
1979	goto out_unlock;
1980
1981	sctp_sendmsg_update_sinfo(asoc, sinfo, cmsgs: &cmsgs);
1982
1983	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1984	NULL, sinfo);
1985	if (err < 0)
1986	goto out_unlock;
1987
1988	iov_iter_revert(i: &msg->msg_iter, bytes: err);
1989	}
1990
1991	goto out_unlock;
1992	}
1993
1994	/* Get and check or create asoc */
1995	if (daddr) {
1996	asoc = sctp_endpoint_lookup_assoc(ep, paddr: daddr, &transport);
1997	if (asoc) {
1998	err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1999	msg_len);
2000	if (err <= 0)
2001	goto out_unlock;
2002	} else {
2003	err = sctp_sendmsg_new_asoc(sk, sflags, cmsgs: &cmsgs, daddr,
2004	tp: &transport);
2005	if (err)
2006	goto out_unlock;
2007
2008	asoc = transport->asoc;
2009	new = true;
2010	}
2011
2012	if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2013	transport = NULL;
2014	} else {
2015	asoc = sctp_id2assoc(sk, id: sinfo->sinfo_assoc_id);
2016	if (!asoc) {
2017	err = -EPIPE;
2018	goto out_unlock;
2019	}
2020
2021	err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2022	if (err <= 0)
2023	goto out_unlock;
2024	}
2025
2026	/* Update snd_info with the asoc */
2027	sctp_sendmsg_update_sinfo(asoc, sinfo, cmsgs: &cmsgs);
2028
2029	/* Send msg to the asoc */
2030	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2031	if (err < 0 && err != -ESRCH && new)
2032	sctp_association_free(asoc);
2033
2034	out_unlock:
2035	release_sock(sk);
2036	out:
2037	return sctp_error(sk, flags: msg->msg_flags, err);
2038	}
2039
2040	/* This is an extended version of skb_pull() that removes the data from the
2041	* start of a skb even when data is spread across the list of skb's in the
2042	* frag_list. len specifies the total amount of data that needs to be removed.
2043	* when 'len' bytes could be removed from the skb, it returns 0.
2044	* If 'len' exceeds the total skb length, it returns the no. of bytes that
2045	* could not be removed.
2046	*/
2047	static int sctp_skb_pull(struct sk_buff *skb, int len)
2048	{
2049	struct sk_buff *list;
2050	int skb_len = skb_headlen(skb);
2051	int rlen;
2052
2053	if (len <= skb_len) {
2054	__skb_pull(skb, len);
2055	return 0;
2056	}
2057	len -= skb_len;
2058	__skb_pull(skb, len: skb_len);
2059
2060	skb_walk_frags(skb, list) {
2061	rlen = sctp_skb_pull(skb: list, len);
2062	skb->len -= (len-rlen);
2063	skb->data_len -= (len-rlen);
2064
2065	if (!rlen)
2066	return 0;
2067
2068	len = rlen;
2069	}
2070
2071	return len;
2072	}
2073
2074	/* API 3.1.3 recvmsg() - UDP Style Syntax
2075	*
2076	* ssize_t recvmsg(int socket, struct msghdr *message,
2077	* int flags);
2078	*
2079	* socket - the socket descriptor of the endpoint.
2080	* message - pointer to the msghdr structure which contains a single
2081	* user message and possibly some ancillary data.
2082	*
2083	* See Section 5 for complete description of the data
2084	* structures.
2085	*
2086	* flags - flags sent or received with the user message, see Section
2087	* 5 for complete description of the flags.
2088	*/
2089	static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2090	int flags, int *addr_len)
2091	{
2092	struct sctp_ulpevent *event = NULL;
2093	struct sctp_sock *sp = sctp_sk(sk);
2094	struct sk_buff *skb, *head_skb;
2095	int copied;
2096	int err = 0;
2097	int skb_len;
2098
2099	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
2100	__func__, sk, msg, len, flags, addr_len);
2101
2102	lock_sock(sk);
2103
2104	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2105	!sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2106	err = -ENOTCONN;
2107	goto out;
2108	}
2109
2110	skb = sctp_skb_recv_datagram(sk, flags, &err);
2111	if (!skb)
2112	goto out;
2113
2114	/* Get the total length of the skb including any skb's in the
2115	* frag_list.
2116	*/
2117	skb_len = skb->len;
2118
2119	copied = skb_len;
2120	if (copied > len)
2121	copied = len;
2122
2123	err = skb_copy_datagram_msg(from: skb, offset: 0, msg, size: copied);
2124
2125	event = sctp_skb2event(skb);
2126
2127	if (err)
2128	goto out_free;
2129
2130	if (event->chunk && event->chunk->head_skb)
2131	head_skb = event->chunk->head_skb;
2132	else
2133	head_skb = skb;
2134	sock_recv_cmsgs(msg, sk, skb: head_skb);
2135	if (sctp_ulpevent_is_notification(event)) {
2136	msg->msg_flags |= MSG_NOTIFICATION;
2137	sp->pf->event_msgname(event, msg->msg_name, addr_len);
2138	} else {
2139	sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2140	}
2141
2142	/* Check if we allow SCTP_NXTINFO. */
2143	if (sp->recvnxtinfo)
2144	sctp_ulpevent_read_nxtinfo(event, msg, sk);
2145	/* Check if we allow SCTP_RCVINFO. */
2146	if (sp->recvrcvinfo)
2147	sctp_ulpevent_read_rcvinfo(event, msg);
2148	/* Check if we allow SCTP_SNDRCVINFO. */
2149	if (sctp_ulpevent_type_enabled(subscribe: sp->subscribe, SCTP_DATA_IO_EVENT))
2150	sctp_ulpevent_read_sndrcvinfo(event, msg);
2151
2152	err = copied;
2153
2154	/* If skb's length exceeds the user's buffer, update the skb and
2155	* push it back to the receive_queue so that the next call to
2156	* recvmsg() will return the remaining data. Don't set MSG_EOR.
2157	*/
2158	if (skb_len > copied) {
2159	msg->msg_flags &= ~MSG_EOR;
2160	if (flags & MSG_PEEK)
2161	goto out_free;
2162	sctp_skb_pull(skb, len: copied);
2163	skb_queue_head(list: &sk->sk_receive_queue, newsk: skb);
2164
2165	/* When only partial message is copied to the user, increase
2166	* rwnd by that amount. If all the data in the skb is read,
2167	* rwnd is updated when the event is freed.
2168	*/
2169	if (!sctp_ulpevent_is_notification(event))
2170	sctp_assoc_rwnd_increase(event->asoc, copied);
2171	goto out;
2172	} else if ((event->msg_flags & MSG_NOTIFICATION) ||
2173	(event->msg_flags & MSG_EOR))
2174	msg->msg_flags |= MSG_EOR;
2175	else
2176	msg->msg_flags &= ~MSG_EOR;
2177
2178	out_free:
2179	if (flags & MSG_PEEK) {
2180	/* Release the skb reference acquired after peeking the skb in
2181	* sctp_skb_recv_datagram().
2182	*/
2183	kfree_skb(skb);
2184	} else {
2185	/* Free the event which includes releasing the reference to
2186	* the owner of the skb, freeing the skb and updating the
2187	* rwnd.
2188	*/
2189	sctp_ulpevent_free(event);
2190	}
2191	out:
2192	release_sock(sk);
2193	return err;
2194	}
2195
2196	/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2197	*
2198	* This option is a on/off flag. If enabled no SCTP message
2199	* fragmentation will be performed. Instead if a message being sent
2200	* exceeds the current PMTU size, the message will NOT be sent and
2201	* instead a error will be indicated to the user.
2202	*/
2203	static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2204	unsigned int optlen)
2205	{
2206	if (optlen < sizeof(int))
2207	return -EINVAL;
2208	sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2209	return 0;
2210	}
2211
2212	static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2213	unsigned int optlen)
2214	{
2215	struct sctp_sock *sp = sctp_sk(sk);
2216	struct sctp_association *asoc;
2217	int i;
2218
2219	if (optlen > sizeof(struct sctp_event_subscribe))
2220	return -EINVAL;
2221
2222	for (i = 0; i < optlen; i++)
2223	sctp_ulpevent_type_set(subscribe: &sp->subscribe, sn_type: SCTP_SN_TYPE_BASE + i,
2224	on: sn_type[i]);
2225
2226	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2227	asoc->subscribe = sctp_sk(sk)->subscribe;
2228
2229	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2230	* if there is no data to be sent or retransmit, the stack will
2231	* immediately send up this notification.
2232	*/
2233	if (sctp_ulpevent_type_enabled(subscribe: sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2234	struct sctp_ulpevent *event;
2235
2236	asoc = sctp_id2assoc(sk, id: 0);
2237	if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2238	event = sctp_ulpevent_make_sender_dry_event(asoc,
2239	GFP_USER | __GFP_NOWARN);
2240	if (!event)
2241	return -ENOMEM;
2242
2243	asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2244	}
2245	}
2246
2247	return 0;
2248	}
2249
2250	/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2251	*
2252	* This socket option is applicable to the UDP-style socket only. When
2253	* set it will cause associations that are idle for more than the
2254	* specified number of seconds to automatically close. An association
2255	* being idle is defined an association that has NOT sent or received
2256	* user data. The special value of '0' indicates that no automatic
2257	* close of any associations should be performed. The option expects an
2258	* integer defining the number of seconds of idle time before an
2259	* association is closed.
2260	*/
2261	static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2262	unsigned int optlen)
2263	{
2264	struct sctp_sock *sp = sctp_sk(sk);
2265	struct net *net = sock_net(sk);
2266
2267	/* Applicable to UDP-style socket only */
2268	if (sctp_style(sk, TCP))
2269	return -EOPNOTSUPP;
2270	if (optlen != sizeof(int))
2271	return -EINVAL;
2272
2273	sp->autoclose = *optval;
2274	if (sp->autoclose > net->sctp.max_autoclose)
2275	sp->autoclose = net->sctp.max_autoclose;
2276
2277	return 0;
2278	}
2279
2280	/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2281	*
2282	* Applications can enable or disable heartbeats for any peer address of
2283	* an association, modify an address's heartbeat interval, force a
2284	* heartbeat to be sent immediately, and adjust the address's maximum
2285	* number of retransmissions sent before an address is considered
2286	* unreachable. The following structure is used to access and modify an
2287	* address's parameters:
2288	*
2289	* struct sctp_paddrparams {
2290	* sctp_assoc_t spp_assoc_id;
2291	* struct sockaddr_storage spp_address;
2292	* uint32_t spp_hbinterval;
2293	* uint16_t spp_pathmaxrxt;
2294	* uint32_t spp_pathmtu;
2295	* uint32_t spp_sackdelay;
2296	* uint32_t spp_flags;
2297	* uint32_t spp_ipv6_flowlabel;
2298	* uint8_t spp_dscp;
2299	* };
2300	*
2301	* spp_assoc_id - (one-to-many style socket) This is filled in the
2302	* application, and identifies the association for
2303	* this query.
2304	* spp_address - This specifies which address is of interest.
2305	* spp_hbinterval - This contains the value of the heartbeat interval,
2306	* in milliseconds. If a value of zero
2307	* is present in this field then no changes are to
2308	* be made to this parameter.
2309	* spp_pathmaxrxt - This contains the maximum number of
2310	* retransmissions before this address shall be
2311	* considered unreachable. If a value of zero
2312	* is present in this field then no changes are to
2313	* be made to this parameter.
2314	* spp_pathmtu - When Path MTU discovery is disabled the value
2315	* specified here will be the "fixed" path mtu.
2316	* Note that if the spp_address field is empty
2317	* then all associations on this address will
2318	* have this fixed path mtu set upon them.
2319	*
2320	* spp_sackdelay - When delayed sack is enabled, this value specifies
2321	* the number of milliseconds that sacks will be delayed
2322	* for. This value will apply to all addresses of an
2323	* association if the spp_address field is empty. Note
2324	* also, that if delayed sack is enabled and this
2325	* value is set to 0, no change is made to the last
2326	* recorded delayed sack timer value.
2327	*
2328	* spp_flags - These flags are used to control various features
2329	* on an association. The flag field may contain
2330	* zero or more of the following options.
2331	*
2332	* SPP_HB_ENABLE - Enable heartbeats on the
2333	* specified address. Note that if the address
2334	* field is empty all addresses for the association
2335	* have heartbeats enabled upon them.
2336	*
2337	* SPP_HB_DISABLE - Disable heartbeats on the
2338	* speicifed address. Note that if the address
2339	* field is empty all addresses for the association
2340	* will have their heartbeats disabled. Note also
2341	* that SPP_HB_ENABLE and SPP_HB_DISABLE are
2342	* mutually exclusive, only one of these two should
2343	* be specified. Enabling both fields will have
2344	* undetermined results.
2345	*
2346	* SPP_HB_DEMAND - Request a user initiated heartbeat
2347	* to be made immediately.
2348	*
2349	* SPP_HB_TIME_IS_ZERO - Specify's that the time for
2350	* heartbeat delayis to be set to the value of 0
2351	* milliseconds.
2352	*
2353	* SPP_PMTUD_ENABLE - This field will enable PMTU
2354	* discovery upon the specified address. Note that
2355	* if the address feild is empty then all addresses
2356	* on the association are effected.
2357	*
2358	* SPP_PMTUD_DISABLE - This field will disable PMTU
2359	* discovery upon the specified address. Note that
2360	* if the address feild is empty then all addresses
2361	* on the association are effected. Not also that
2362	* SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2363	* exclusive. Enabling both will have undetermined
2364	* results.
2365	*
2366	* SPP_SACKDELAY_ENABLE - Setting this flag turns
2367	* on delayed sack. The time specified in spp_sackdelay
2368	* is used to specify the sack delay for this address. Note
2369	* that if spp_address is empty then all addresses will
2370	* enable delayed sack and take on the sack delay
2371	* value specified in spp_sackdelay.
2372	* SPP_SACKDELAY_DISABLE - Setting this flag turns
2373	* off delayed sack. If the spp_address field is blank then
2374	* delayed sack is disabled for the entire association. Note
2375	* also that this field is mutually exclusive to
2376	* SPP_SACKDELAY_ENABLE, setting both will have undefined
2377	* results.
2378	*
2379	* SPP_IPV6_FLOWLABEL: Setting this flag enables the
2380	* setting of the IPV6 flow label value. The value is
2381	* contained in the spp_ipv6_flowlabel field.
2382	* Upon retrieval, this flag will be set to indicate that
2383	* the spp_ipv6_flowlabel field has a valid value returned.
2384	* If a specific destination address is set (in the
2385	* spp_address field), then the value returned is that of
2386	* the address. If just an association is specified (and
2387	* no address), then the association's default flow label
2388	* is returned. If neither an association nor a destination
2389	* is specified, then the socket's default flow label is
2390	* returned. For non-IPv6 sockets, this flag will be left
2391	* cleared.
2392	*
2393	* SPP_DSCP: Setting this flag enables the setting of the
2394	* Differentiated Services Code Point (DSCP) value
2395	* associated with either the association or a specific
2396	* address. The value is obtained in the spp_dscp field.
2397	* Upon retrieval, this flag will be set to indicate that
2398	* the spp_dscp field has a valid value returned. If a
2399	* specific destination address is set when called (in the
2400	* spp_address field), then that specific destination
2401	* address's DSCP value is returned. If just an association
2402	* is specified, then the association's default DSCP is
2403	* returned. If neither an association nor a destination is
2404	* specified, then the socket's default DSCP is returned.
2405	*
2406	* spp_ipv6_flowlabel
2407	* - This field is used in conjunction with the
2408	* SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2409	* The 20 least significant bits are used for the flow
2410	* label. This setting has precedence over any IPv6-layer
2411	* setting.
2412	*
2413	* spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2414	* and contains the DSCP. The 6 most significant bits are
2415	* used for the DSCP. This setting has precedence over any
2416	* IPv4- or IPv6- layer setting.
2417	*/
2418	static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2419	struct sctp_transport *trans,
2420	struct sctp_association *asoc,
2421	struct sctp_sock *sp,
2422	int hb_change,
2423	int pmtud_change,
2424	int sackdelay_change)
2425	{
2426	int error;
2427
2428	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2429	error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2430	trans->asoc, arg: trans);
2431	if (error)
2432	return error;
2433	}
2434
2435	/* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2436	* this field is ignored. Note also that a value of zero indicates
2437	* the current setting should be left unchanged.
2438	*/
2439	if (params->spp_flags & SPP_HB_ENABLE) {
2440
2441	/* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2442	* set. This lets us use 0 value when this flag
2443	* is set.
2444	*/
2445	if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2446	params->spp_hbinterval = 0;
2447
2448	if (params->spp_hbinterval ||
2449	(params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2450	if (trans) {
2451	trans->hbinterval =
2452	msecs_to_jiffies(m: params->spp_hbinterval);
2453	sctp_transport_reset_hb_timer(trans);
2454	} else if (asoc) {
2455	asoc->hbinterval =
2456	msecs_to_jiffies(m: params->spp_hbinterval);
2457	} else {
2458	sp->hbinterval = params->spp_hbinterval;
2459	}
2460	}
2461	}
2462
2463	if (hb_change) {
2464	if (trans) {
2465	trans->param_flags =
2466	(trans->param_flags & ~SPP_HB) | hb_change;
2467	} else if (asoc) {
2468	asoc->param_flags =
2469	(asoc->param_flags & ~SPP_HB) | hb_change;
2470	} else {
2471	sp->param_flags =
2472	(sp->param_flags & ~SPP_HB) | hb_change;
2473	}
2474	}
2475
2476	/* When Path MTU discovery is disabled the value specified here will
2477	* be the "fixed" path mtu (i.e. the value of the spp_flags field must
2478	* include the flag SPP_PMTUD_DISABLE for this field to have any
2479	* effect).
2480	*/
2481	if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2482	if (trans) {
2483	trans->pathmtu = params->spp_pathmtu;
2484	sctp_assoc_sync_pmtu(asoc);
2485	} else if (asoc) {
2486	sctp_assoc_set_pmtu(asoc, pmtu: params->spp_pathmtu);
2487	} else {
2488	sp->pathmtu = params->spp_pathmtu;
2489	}
2490	}
2491
2492	if (pmtud_change) {
2493	if (trans) {
2494	int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2495	(params->spp_flags & SPP_PMTUD_ENABLE);
2496	trans->param_flags =
2497	(trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2498	if (update) {
2499	sctp_transport_pmtu(trans, sk: sctp_opt2sk(sp));
2500	sctp_assoc_sync_pmtu(asoc);
2501	}
2502	sctp_transport_pl_reset(t: trans);
2503	} else if (asoc) {
2504	asoc->param_flags =
2505	(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2506	} else {
2507	sp->param_flags =
2508	(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2509	}
2510	}
2511
2512	/* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2513	* value of this field is ignored. Note also that a value of zero
2514	* indicates the current setting should be left unchanged.
2515	*/
2516	if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2517	if (trans) {
2518	trans->sackdelay =
2519	msecs_to_jiffies(m: params->spp_sackdelay);
2520	} else if (asoc) {
2521	asoc->sackdelay =
2522	msecs_to_jiffies(m: params->spp_sackdelay);
2523	} else {
2524	sp->sackdelay = params->spp_sackdelay;
2525	}
2526	}
2527
2528	if (sackdelay_change) {
2529	if (trans) {
2530	trans->param_flags =
2531	(trans->param_flags & ~SPP_SACKDELAY) |
2532	sackdelay_change;
2533	} else if (asoc) {
2534	asoc->param_flags =
2535	(asoc->param_flags & ~SPP_SACKDELAY) |
2536	sackdelay_change;
2537	} else {
2538	sp->param_flags =
2539	(sp->param_flags & ~SPP_SACKDELAY) |
2540	sackdelay_change;
2541	}
2542	}
2543
2544	/* Note that a value of zero indicates the current setting should be
2545	left unchanged.
2546	*/
2547	if (params->spp_pathmaxrxt) {
2548	if (trans) {
2549	trans->pathmaxrxt = params->spp_pathmaxrxt;
2550	} else if (asoc) {
2551	asoc->pathmaxrxt = params->spp_pathmaxrxt;
2552	} else {
2553	sp->pathmaxrxt = params->spp_pathmaxrxt;
2554	}
2555	}
2556
2557	if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2558	if (trans) {
2559	if (trans->ipaddr.sa.sa_family == AF_INET6) {
2560	trans->flowlabel = params->spp_ipv6_flowlabel &
2561	SCTP_FLOWLABEL_VAL_MASK;
2562	trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2563	}
2564	} else if (asoc) {
2565	struct sctp_transport *t;
2566
2567	list_for_each_entry(t, &asoc->peer.transport_addr_list,
2568	transports) {
2569	if (t->ipaddr.sa.sa_family != AF_INET6)
2570	continue;
2571	t->flowlabel = params->spp_ipv6_flowlabel &
2572	SCTP_FLOWLABEL_VAL_MASK;
2573	t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2574	}
2575	asoc->flowlabel = params->spp_ipv6_flowlabel &
2576	SCTP_FLOWLABEL_VAL_MASK;
2577	asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2578	} else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2579	sp->flowlabel = params->spp_ipv6_flowlabel &
2580	SCTP_FLOWLABEL_VAL_MASK;
2581	sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2582	}
2583	}
2584
2585	if (params->spp_flags & SPP_DSCP) {
2586	if (trans) {
2587	trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2588	trans->dscp |= SCTP_DSCP_SET_MASK;
2589	} else if (asoc) {
2590	struct sctp_transport *t;
2591
2592	list_for_each_entry(t, &asoc->peer.transport_addr_list,
2593	transports) {
2594	t->dscp = params->spp_dscp &
2595	SCTP_DSCP_VAL_MASK;
2596	t->dscp |= SCTP_DSCP_SET_MASK;
2597	}
2598	asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2599	asoc->dscp |= SCTP_DSCP_SET_MASK;
2600	} else {
2601	sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2602	sp->dscp |= SCTP_DSCP_SET_MASK;
2603	}
2604	}
2605
2606	return 0;
2607	}
2608
2609	static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2610	struct sctp_paddrparams *params,
2611	unsigned int optlen)
2612	{
2613	struct sctp_transport *trans = NULL;
2614	struct sctp_association *asoc = NULL;
2615	struct sctp_sock *sp = sctp_sk(sk);
2616	int error;
2617	int hb_change, pmtud_change, sackdelay_change;
2618
2619	if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2620	spp_ipv6_flowlabel), 4)) {
2621	if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2622	return -EINVAL;
2623	} else if (optlen != sizeof(*params)) {
2624	return -EINVAL;
2625	}
2626
2627	/* Validate flags and value parameters. */
2628	hb_change = params->spp_flags & SPP_HB;
2629	pmtud_change = params->spp_flags & SPP_PMTUD;
2630	sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2631
2632	if (hb_change == SPP_HB ||
2633	pmtud_change == SPP_PMTUD ||
2634	sackdelay_change == SPP_SACKDELAY ||
2635	params->spp_sackdelay > 500 ||
2636	(params->spp_pathmtu &&
2637	params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2638	return -EINVAL;
2639
2640	/* If an address other than INADDR_ANY is specified, and
2641	* no transport is found, then the request is invalid.
2642	*/
2643	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params->spp_address)) {
2644	trans = sctp_addr_id2transport(sk, addr: &params->spp_address,
2645	id: params->spp_assoc_id);
2646	if (!trans)
2647	return -EINVAL;
2648	}
2649
2650	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2651	* socket is a one to many style socket, and an association
2652	* was not found, then the id was invalid.
2653	*/
2654	asoc = sctp_id2assoc(sk, id: params->spp_assoc_id);
2655	if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2656	sctp_style(sk, UDP))
2657	return -EINVAL;
2658
2659	/* Heartbeat demand can only be sent on a transport or
2660	* association, but not a socket.
2661	*/
2662	if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2663	return -EINVAL;
2664
2665	/* Process parameters. */
2666	error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2667	hb_change, pmtud_change,
2668	sackdelay_change);
2669
2670	if (error)
2671	return error;
2672
2673	/* If changes are for association, also apply parameters to each
2674	* transport.
2675	*/
2676	if (!trans && asoc) {
2677	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2678	transports) {
2679	sctp_apply_peer_addr_params(params, trans, asoc, sp,
2680	hb_change, pmtud_change,
2681	sackdelay_change);
2682	}
2683	}
2684
2685	return 0;
2686	}
2687
2688	static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2689	{
2690	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2691	}
2692
2693	static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2694	{
2695	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2696	}
2697
2698	static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2699	struct sctp_association *asoc)
2700	{
2701	struct sctp_transport *trans;
2702
2703	if (params->sack_delay) {
2704	asoc->sackdelay = msecs_to_jiffies(m: params->sack_delay);
2705	asoc->param_flags =
2706	sctp_spp_sackdelay_enable(param_flags: asoc->param_flags);
2707	}
2708	if (params->sack_freq == 1) {
2709	asoc->param_flags =
2710	sctp_spp_sackdelay_disable(param_flags: asoc->param_flags);
2711	} else if (params->sack_freq > 1) {
2712	asoc->sackfreq = params->sack_freq;
2713	asoc->param_flags =
2714	sctp_spp_sackdelay_enable(param_flags: asoc->param_flags);
2715	}
2716
2717	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2718	transports) {
2719	if (params->sack_delay) {
2720	trans->sackdelay = msecs_to_jiffies(m: params->sack_delay);
2721	trans->param_flags =
2722	sctp_spp_sackdelay_enable(param_flags: trans->param_flags);
2723	}
2724	if (params->sack_freq == 1) {
2725	trans->param_flags =
2726	sctp_spp_sackdelay_disable(param_flags: trans->param_flags);
2727	} else if (params->sack_freq > 1) {
2728	trans->sackfreq = params->sack_freq;
2729	trans->param_flags =
2730	sctp_spp_sackdelay_enable(param_flags: trans->param_flags);
2731	}
2732	}
2733	}
2734
2735	/*
2736	* 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2737	*
2738	* This option will effect the way delayed acks are performed. This
2739	* option allows you to get or set the delayed ack time, in
2740	* milliseconds. It also allows changing the delayed ack frequency.
2741	* Changing the frequency to 1 disables the delayed sack algorithm. If
2742	* the assoc_id is 0, then this sets or gets the endpoints default
2743	* values. If the assoc_id field is non-zero, then the set or get
2744	* effects the specified association for the one to many model (the
2745	* assoc_id field is ignored by the one to one model). Note that if
2746	* sack_delay or sack_freq are 0 when setting this option, then the
2747	* current values will remain unchanged.
2748	*
2749	* struct sctp_sack_info {
2750	* sctp_assoc_t sack_assoc_id;
2751	* uint32_t sack_delay;
2752	* uint32_t sack_freq;
2753	* };
2754	*
2755	* sack_assoc_id - This parameter, indicates which association the user
2756	* is performing an action upon. Note that if this field's value is
2757	* zero then the endpoints default value is changed (effecting future
2758	* associations only).
2759	*
2760	* sack_delay - This parameter contains the number of milliseconds that
2761	* the user is requesting the delayed ACK timer be set to. Note that
2762	* this value is defined in the standard to be between 200 and 500
2763	* milliseconds.
2764	*
2765	* sack_freq - This parameter contains the number of packets that must
2766	* be received before a sack is sent without waiting for the delay
2767	* timer to expire. The default value for this is 2, setting this
2768	* value to 1 will disable the delayed sack algorithm.
2769	*/
2770	static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2771	struct sctp_sack_info *params)
2772	{
2773	struct sctp_sock *sp = sctp_sk(sk);
2774	struct sctp_association *asoc;
2775
2776	/* Validate value parameter. */
2777	if (params->sack_delay > 500)
2778	return -EINVAL;
2779
2780	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2781	* socket is a one to many style socket, and an association
2782	* was not found, then the id was invalid.
2783	*/
2784	asoc = sctp_id2assoc(sk, id: params->sack_assoc_id);
2785	if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2786	sctp_style(sk, UDP))
2787	return -EINVAL;
2788
2789	if (asoc) {
2790	sctp_apply_asoc_delayed_ack(params, asoc);
2791
2792	return 0;
2793	}
2794
2795	if (sctp_style(sk, TCP))
2796	params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2797
2798	if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2799	params->sack_assoc_id == SCTP_ALL_ASSOC) {
2800	if (params->sack_delay) {
2801	sp->sackdelay = params->sack_delay;
2802	sp->param_flags =
2803	sctp_spp_sackdelay_enable(param_flags: sp->param_flags);
2804	}
2805	if (params->sack_freq == 1) {
2806	sp->param_flags =
2807	sctp_spp_sackdelay_disable(param_flags: sp->param_flags);
2808	} else if (params->sack_freq > 1) {
2809	sp->sackfreq = params->sack_freq;
2810	sp->param_flags =
2811	sctp_spp_sackdelay_enable(param_flags: sp->param_flags);
2812	}
2813	}
2814
2815	if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2816	params->sack_assoc_id == SCTP_ALL_ASSOC)
2817	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2818	sctp_apply_asoc_delayed_ack(params, asoc);
2819
2820	return 0;
2821	}
2822
2823	static int sctp_setsockopt_delayed_ack(struct sock *sk,
2824	struct sctp_sack_info *params,
2825	unsigned int optlen)
2826	{
2827	if (optlen == sizeof(struct sctp_assoc_value)) {
2828	struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2829	struct sctp_sack_info p;
2830
2831	pr_warn_ratelimited(DEPRECATED
2832	"%s (pid %d) "
2833	"Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2834	"Use struct sctp_sack_info instead\n",
2835	current->comm, task_pid_nr(current));
2836
2837	p.sack_assoc_id = v->assoc_id;
2838	p.sack_delay = v->assoc_value;
2839	p.sack_freq = v->assoc_value ? 0 : 1;
2840	return __sctp_setsockopt_delayed_ack(sk, params: &p);
2841	}
2842
2843	if (optlen != sizeof(struct sctp_sack_info))
2844	return -EINVAL;
2845	if (params->sack_delay == 0 && params->sack_freq == 0)
2846	return 0;
2847	return __sctp_setsockopt_delayed_ack(sk, params);
2848	}
2849
2850	/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2851	*
2852	* Applications can specify protocol parameters for the default association
2853	* initialization. The option name argument to setsockopt() and getsockopt()
2854	* is SCTP_INITMSG.
2855	*
2856	* Setting initialization parameters is effective only on an unconnected
2857	* socket (for UDP-style sockets only future associations are effected
2858	* by the change). With TCP-style sockets, this option is inherited by
2859	* sockets derived from a listener socket.
2860	*/
2861	static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2862	unsigned int optlen)
2863	{
2864	struct sctp_sock *sp = sctp_sk(sk);
2865
2866	if (optlen != sizeof(struct sctp_initmsg))
2867	return -EINVAL;
2868
2869	if (sinit->sinit_num_ostreams)
2870	sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2871	if (sinit->sinit_max_instreams)
2872	sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2873	if (sinit->sinit_max_attempts)
2874	sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2875	if (sinit->sinit_max_init_timeo)
2876	sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2877
2878	return 0;
2879	}
2880
2881	/*
2882	* 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2883	*
2884	* Applications that wish to use the sendto() system call may wish to
2885	* specify a default set of parameters that would normally be supplied
2886	* through the inclusion of ancillary data. This socket option allows
2887	* such an application to set the default sctp_sndrcvinfo structure.
2888	* The application that wishes to use this socket option simply passes
2889	* in to this call the sctp_sndrcvinfo structure defined in Section
2890	* 5.2.2) The input parameters accepted by this call include
2891	* sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2892	* sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2893	* to this call if the caller is using the UDP model.
2894	*/
2895	static int sctp_setsockopt_default_send_param(struct sock *sk,
2896	struct sctp_sndrcvinfo *info,
2897	unsigned int optlen)
2898	{
2899	struct sctp_sock *sp = sctp_sk(sk);
2900	struct sctp_association *asoc;
2901
2902	if (optlen != sizeof(*info))
2903	return -EINVAL;
2904	if (info->sinfo_flags &
2905	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2906	SCTP_ABORT | SCTP_EOF))
2907	return -EINVAL;
2908
2909	asoc = sctp_id2assoc(sk, id: info->sinfo_assoc_id);
2910	if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2911	sctp_style(sk, UDP))
2912	return -EINVAL;
2913
2914	if (asoc) {
2915	asoc->default_stream = info->sinfo_stream;
2916	asoc->default_flags = info->sinfo_flags;
2917	asoc->default_ppid = info->sinfo_ppid;
2918	asoc->default_context = info->sinfo_context;
2919	asoc->default_timetolive = info->sinfo_timetolive;
2920
2921	return 0;
2922	}
2923
2924	if (sctp_style(sk, TCP))
2925	info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2926
2927	if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2928	info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2929	sp->default_stream = info->sinfo_stream;
2930	sp->default_flags = info->sinfo_flags;
2931	sp->default_ppid = info->sinfo_ppid;
2932	sp->default_context = info->sinfo_context;
2933	sp->default_timetolive = info->sinfo_timetolive;
2934	}
2935
2936	if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2937	info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2938	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2939	asoc->default_stream = info->sinfo_stream;
2940	asoc->default_flags = info->sinfo_flags;
2941	asoc->default_ppid = info->sinfo_ppid;
2942	asoc->default_context = info->sinfo_context;
2943	asoc->default_timetolive = info->sinfo_timetolive;
2944	}
2945	}
2946
2947	return 0;
2948	}
2949
2950	/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2951	* (SCTP_DEFAULT_SNDINFO)
2952	*/
2953	static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2954	struct sctp_sndinfo *info,
2955	unsigned int optlen)
2956	{
2957	struct sctp_sock *sp = sctp_sk(sk);
2958	struct sctp_association *asoc;
2959
2960	if (optlen != sizeof(*info))
2961	return -EINVAL;
2962	if (info->snd_flags &
2963	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2964	SCTP_ABORT | SCTP_EOF))
2965	return -EINVAL;
2966
2967	asoc = sctp_id2assoc(sk, id: info->snd_assoc_id);
2968	if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2969	sctp_style(sk, UDP))
2970	return -EINVAL;
2971
2972	if (asoc) {
2973	asoc->default_stream = info->snd_sid;
2974	asoc->default_flags = info->snd_flags;
2975	asoc->default_ppid = info->snd_ppid;
2976	asoc->default_context = info->snd_context;
2977
2978	return 0;
2979	}
2980
2981	if (sctp_style(sk, TCP))
2982	info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2983
2984	if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2985	info->snd_assoc_id == SCTP_ALL_ASSOC) {
2986	sp->default_stream = info->snd_sid;
2987	sp->default_flags = info->snd_flags;
2988	sp->default_ppid = info->snd_ppid;
2989	sp->default_context = info->snd_context;
2990	}
2991
2992	if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2993	info->snd_assoc_id == SCTP_ALL_ASSOC) {
2994	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2995	asoc->default_stream = info->snd_sid;
2996	asoc->default_flags = info->snd_flags;
2997	asoc->default_ppid = info->snd_ppid;
2998	asoc->default_context = info->snd_context;
2999	}
3000	}
3001
3002	return 0;
3003	}
3004
3005	/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3006	*
3007	* Requests that the local SCTP stack use the enclosed peer address as
3008	* the association primary. The enclosed address must be one of the
3009	* association peer's addresses.
3010	*/
3011	static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3012	unsigned int optlen)
3013	{
3014	struct sctp_transport *trans;
3015	struct sctp_af *af;
3016	int err;
3017
3018	if (optlen != sizeof(struct sctp_prim))
3019	return -EINVAL;
3020
3021	/* Allow security module to validate address but need address len. */
3022	af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3023	if (!af)
3024	return -EINVAL;
3025
3026	err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3027	address: (struct sockaddr *)&prim->ssp_addr,
3028	addrlen: af->sockaddr_len);
3029	if (err)
3030	return err;
3031
3032	trans = sctp_addr_id2transport(sk, addr: &prim->ssp_addr, id: prim->ssp_assoc_id);
3033	if (!trans)
3034	return -EINVAL;
3035
3036	sctp_assoc_set_primary(trans->asoc, trans);
3037
3038	return 0;
3039	}
3040
3041	/*
3042	* 7.1.5 SCTP_NODELAY
3043	*
3044	* Turn on/off any Nagle-like algorithm. This means that packets are
3045	* generally sent as soon as possible and no unnecessary delays are
3046	* introduced, at the cost of more packets in the network. Expects an
3047	* integer boolean flag.
3048	*/
3049	static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3050	unsigned int optlen)
3051	{
3052	if (optlen < sizeof(int))
3053	return -EINVAL;
3054	sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3055	return 0;
3056	}
3057
3058	/*
3059	*
3060	* 7.1.1 SCTP_RTOINFO
3061	*
3062	* The protocol parameters used to initialize and bound retransmission
3063	* timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3064	* and modify these parameters.
3065	* All parameters are time values, in milliseconds. A value of 0, when
3066	* modifying the parameters, indicates that the current value should not
3067	* be changed.
3068	*
3069	*/
3070	static int sctp_setsockopt_rtoinfo(struct sock *sk,
3071	struct sctp_rtoinfo *rtoinfo,
3072	unsigned int optlen)
3073	{
3074	struct sctp_association *asoc;
3075	unsigned long rto_min, rto_max;
3076	struct sctp_sock *sp = sctp_sk(sk);
3077
3078	if (optlen != sizeof (struct sctp_rtoinfo))
3079	return -EINVAL;
3080
3081	asoc = sctp_id2assoc(sk, id: rtoinfo->srto_assoc_id);
3082
3083	/* Set the values to the specific association */
3084	if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3085	sctp_style(sk, UDP))
3086	return -EINVAL;
3087
3088	rto_max = rtoinfo->srto_max;
3089	rto_min = rtoinfo->srto_min;
3090
3091	if (rto_max)
3092	rto_max = asoc ? msecs_to_jiffies(m: rto_max) : rto_max;
3093	else
3094	rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3095
3096	if (rto_min)
3097	rto_min = asoc ? msecs_to_jiffies(m: rto_min) : rto_min;
3098	else
3099	rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3100
3101	if (rto_min > rto_max)
3102	return -EINVAL;
3103
3104	if (asoc) {
3105	if (rtoinfo->srto_initial != 0)
3106	asoc->rto_initial =
3107	msecs_to_jiffies(m: rtoinfo->srto_initial);
3108	asoc->rto_max = rto_max;
3109	asoc->rto_min = rto_min;
3110	} else {
3111	/* If there is no association or the association-id = 0
3112	* set the values to the endpoint.
3113	*/
3114	if (rtoinfo->srto_initial != 0)
3115	sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3116	sp->rtoinfo.srto_max = rto_max;
3117	sp->rtoinfo.srto_min = rto_min;
3118	}
3119
3120	return 0;
3121	}
3122
3123	/*
3124	*
3125	* 7.1.2 SCTP_ASSOCINFO
3126	*
3127	* This option is used to tune the maximum retransmission attempts
3128	* of the association.
3129	* Returns an error if the new association retransmission value is
3130	* greater than the sum of the retransmission value of the peer.
3131	* See [SCTP] for more information.
3132	*
3133	*/
3134	static int sctp_setsockopt_associnfo(struct sock *sk,
3135	struct sctp_assocparams *assocparams,
3136	unsigned int optlen)
3137	{
3138
3139	struct sctp_association *asoc;
3140
3141	if (optlen != sizeof(struct sctp_assocparams))
3142	return -EINVAL;
3143
3144	asoc = sctp_id2assoc(sk, id: assocparams->sasoc_assoc_id);
3145
3146	if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3147	sctp_style(sk, UDP))
3148	return -EINVAL;
3149
3150	/* Set the values to the specific association */
3151	if (asoc) {
3152	if (assocparams->sasoc_asocmaxrxt != 0) {
3153	__u32 path_sum = 0;
3154	int paths = 0;
3155	struct sctp_transport *peer_addr;
3156
3157	list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3158	transports) {
3159	path_sum += peer_addr->pathmaxrxt;
3160	paths++;
3161	}
3162
3163	/* Only validate asocmaxrxt if we have more than
3164	* one path/transport. We do this because path
3165	* retransmissions are only counted when we have more
3166	* then one path.
3167	*/
3168	if (paths > 1 &&
3169	assocparams->sasoc_asocmaxrxt > path_sum)
3170	return -EINVAL;
3171
3172	asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3173	}
3174
3175	if (assocparams->sasoc_cookie_life != 0)
3176	asoc->cookie_life =
3177	ms_to_ktime(ms: assocparams->sasoc_cookie_life);
3178	} else {
3179	/* Set the values to the endpoint */
3180	struct sctp_sock *sp = sctp_sk(sk);
3181
3182	if (assocparams->sasoc_asocmaxrxt != 0)
3183	sp->assocparams.sasoc_asocmaxrxt =
3184	assocparams->sasoc_asocmaxrxt;
3185	if (assocparams->sasoc_cookie_life != 0)
3186	sp->assocparams.sasoc_cookie_life =
3187	assocparams->sasoc_cookie_life;
3188	}
3189	return 0;
3190	}
3191
3192	/*
3193	* 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3194	*
3195	* This socket option is a boolean flag which turns on or off mapped V4
3196	* addresses. If this option is turned on and the socket is type
3197	* PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3198	* If this option is turned off, then no mapping will be done of V4
3199	* addresses and a user will receive both PF_INET6 and PF_INET type
3200	* addresses on the socket.
3201	*/
3202	static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3203	unsigned int optlen)
3204	{
3205	struct sctp_sock *sp = sctp_sk(sk);
3206
3207	if (optlen < sizeof(int))
3208	return -EINVAL;
3209	if (*val)
3210	sp->v4mapped = 1;
3211	else
3212	sp->v4mapped = 0;
3213
3214	return 0;
3215	}
3216
3217	/*
3218	* 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3219	* This option will get or set the maximum size to put in any outgoing
3220	* SCTP DATA chunk. If a message is larger than this size it will be
3221	* fragmented by SCTP into the specified size. Note that the underlying
3222	* SCTP implementation may fragment into smaller sized chunks when the
3223	* PMTU of the underlying association is smaller than the value set by
3224	* the user. The default value for this option is '0' which indicates
3225	* the user is NOT limiting fragmentation and only the PMTU will effect
3226	* SCTP's choice of DATA chunk size. Note also that values set larger
3227	* than the maximum size of an IP datagram will effectively let SCTP
3228	* control fragmentation (i.e. the same as setting this option to 0).
3229	*
3230	* The following structure is used to access and modify this parameter:
3231	*
3232	* struct sctp_assoc_value {
3233	* sctp_assoc_t assoc_id;
3234	* uint32_t assoc_value;
3235	* };
3236	*
3237	* assoc_id: This parameter is ignored for one-to-one style sockets.
3238	* For one-to-many style sockets this parameter indicates which
3239	* association the user is performing an action upon. Note that if
3240	* this field's value is zero then the endpoints default value is
3241	* changed (effecting future associations only).
3242	* assoc_value: This parameter specifies the maximum size in bytes.
3243	*/
3244	static int sctp_setsockopt_maxseg(struct sock *sk,
3245	struct sctp_assoc_value *params,
3246	unsigned int optlen)
3247	{
3248	struct sctp_sock *sp = sctp_sk(sk);
3249	struct sctp_association *asoc;
3250	sctp_assoc_t assoc_id;
3251	int val;
3252
3253	if (optlen == sizeof(int)) {
3254	pr_warn_ratelimited(DEPRECATED
3255	"%s (pid %d) "
3256	"Use of int in maxseg socket option.\n"
3257	"Use struct sctp_assoc_value instead\n",
3258	current->comm, task_pid_nr(current));
3259	assoc_id = SCTP_FUTURE_ASSOC;
3260	val = *(int *)params;
3261	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3262	assoc_id = params->assoc_id;
3263	val = params->assoc_value;
3264	} else {
3265	return -EINVAL;
3266	}
3267
3268	asoc = sctp_id2assoc(sk, id: assoc_id);
3269	if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3270	sctp_style(sk, UDP))
3271	return -EINVAL;
3272
3273	if (val) {
3274	int min_len, max_len;
3275	__u16 datasize = asoc ? sctp_datachk_len(stream: &asoc->stream) :
3276	sizeof(struct sctp_data_chunk);
3277
3278	min_len = sctp_min_frag_point(sp, datasize);
3279	max_len = SCTP_MAX_CHUNK_LEN - datasize;
3280
3281	if (val < min_len || val > max_len)
3282	return -EINVAL;
3283	}
3284
3285	if (asoc) {
3286	asoc->user_frag = val;
3287	sctp_assoc_update_frag_point(asoc);
3288	} else {
3289	sp->user_frag = val;
3290	}
3291
3292	return 0;
3293	}
3294
3295
3296	/*
3297	* 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3298	*
3299	* Requests that the peer mark the enclosed address as the association
3300	* primary. The enclosed address must be one of the association's
3301	* locally bound addresses. The following structure is used to make a
3302	* set primary request:
3303	*/
3304	static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3305	struct sctp_setpeerprim *prim,
3306	unsigned int optlen)
3307	{
3308	struct sctp_sock *sp;
3309	struct sctp_association *asoc = NULL;
3310	struct sctp_chunk *chunk;
3311	struct sctp_af *af;
3312	int err;
3313
3314	sp = sctp_sk(sk);
3315
3316	if (!sp->ep->asconf_enable)
3317	return -EPERM;
3318
3319	if (optlen != sizeof(struct sctp_setpeerprim))
3320	return -EINVAL;
3321
3322	asoc = sctp_id2assoc(sk, id: prim->sspp_assoc_id);
3323	if (!asoc)
3324	return -EINVAL;
3325
3326	if (!asoc->peer.asconf_capable)
3327	return -EPERM;
3328
3329	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3330	return -EPERM;
3331
3332	if (!sctp_state(asoc, ESTABLISHED))
3333	return -ENOTCONN;
3334
3335	af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3336	if (!af)
3337	return -EINVAL;
3338
3339	if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3340	return -EADDRNOTAVAIL;
3341
3342	if (!sctp_assoc_lookup_laddr(asoc, laddr: (union sctp_addr *)&prim->sspp_addr))
3343	return -EADDRNOTAVAIL;
3344
3345	/* Allow security module to validate address. */
3346	err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3347	address: (struct sockaddr *)&prim->sspp_addr,
3348	addrlen: af->sockaddr_len);
3349	if (err)
3350	return err;
3351
3352	/* Create an ASCONF chunk with SET_PRIMARY parameter */
3353	chunk = sctp_make_asconf_set_prim(asoc,
3354	addr: (union sctp_addr *)&prim->sspp_addr);
3355	if (!chunk)
3356	return -ENOMEM;
3357
3358	err = sctp_send_asconf(asoc, chunk);
3359
3360	pr_debug("%s: we set peer primary addr primitively\n", __func__);
3361
3362	return err;
3363	}
3364
3365	static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3366	struct sctp_setadaptation *adapt,
3367	unsigned int optlen)
3368	{
3369	if (optlen != sizeof(struct sctp_setadaptation))
3370	return -EINVAL;
3371
3372	sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3373
3374	return 0;
3375	}
3376
3377	/*
3378	* 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3379	*
3380	* The context field in the sctp_sndrcvinfo structure is normally only
3381	* used when a failed message is retrieved holding the value that was
3382	* sent down on the actual send call. This option allows the setting of
3383	* a default context on an association basis that will be received on
3384	* reading messages from the peer. This is especially helpful in the
3385	* one-2-many model for an application to keep some reference to an
3386	* internal state machine that is processing messages on the
3387	* association. Note that the setting of this value only effects
3388	* received messages from the peer and does not effect the value that is
3389	* saved with outbound messages.
3390	*/
3391	static int sctp_setsockopt_context(struct sock *sk,
3392	struct sctp_assoc_value *params,
3393	unsigned int optlen)
3394	{
3395	struct sctp_sock *sp = sctp_sk(sk);
3396	struct sctp_association *asoc;
3397
3398	if (optlen != sizeof(struct sctp_assoc_value))
3399	return -EINVAL;
3400
3401	asoc = sctp_id2assoc(sk, id: params->assoc_id);
3402	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3403	sctp_style(sk, UDP))
3404	return -EINVAL;
3405
3406	if (asoc) {
3407	asoc->default_rcv_context = params->assoc_value;
3408
3409	return 0;
3410	}
3411
3412	if (sctp_style(sk, TCP))
3413	params->assoc_id = SCTP_FUTURE_ASSOC;
3414
3415	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3416	params->assoc_id == SCTP_ALL_ASSOC)
3417	sp->default_rcv_context = params->assoc_value;
3418
3419	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3420	params->assoc_id == SCTP_ALL_ASSOC)
3421	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3422	asoc->default_rcv_context = params->assoc_value;
3423
3424	return 0;
3425	}
3426
3427	/*
3428	* 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3429	*
3430	* This options will at a minimum specify if the implementation is doing
3431	* fragmented interleave. Fragmented interleave, for a one to many
3432	* socket, is when subsequent calls to receive a message may return
3433	* parts of messages from different associations. Some implementations
3434	* may allow you to turn this value on or off. If so, when turned off,
3435	* no fragment interleave will occur (which will cause a head of line
3436	* blocking amongst multiple associations sharing the same one to many
3437	* socket). When this option is turned on, then each receive call may
3438	* come from a different association (thus the user must receive data
3439	* with the extended calls (e.g. sctp_recvmsg) to keep track of which
3440	* association each receive belongs to.
3441	*
3442	* This option takes a boolean value. A non-zero value indicates that
3443	* fragmented interleave is on. A value of zero indicates that
3444	* fragmented interleave is off.
3445	*
3446	* Note that it is important that an implementation that allows this
3447	* option to be turned on, have it off by default. Otherwise an unaware
3448	* application using the one to many model may become confused and act
3449	* incorrectly.
3450	*/
3451	static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3452	unsigned int optlen)
3453	{
3454	if (optlen != sizeof(int))
3455	return -EINVAL;
3456
3457	sctp_sk(sk)->frag_interleave = !!*val;
3458
3459	if (!sctp_sk(sk)->frag_interleave)
3460	sctp_sk(sk)->ep->intl_enable = 0;
3461
3462	return 0;
3463	}
3464
3465	/*
3466	* 8.1.21. Set or Get the SCTP Partial Delivery Point
3467	* (SCTP_PARTIAL_DELIVERY_POINT)
3468	*
3469	* This option will set or get the SCTP partial delivery point. This
3470	* point is the size of a message where the partial delivery API will be
3471	* invoked to help free up rwnd space for the peer. Setting this to a
3472	* lower value will cause partial deliveries to happen more often. The
3473	* calls argument is an integer that sets or gets the partial delivery
3474	* point. Note also that the call will fail if the user attempts to set
3475	* this value larger than the socket receive buffer size.
3476	*
3477	* Note that any single message having a length smaller than or equal to
3478	* the SCTP partial delivery point will be delivered in one single read
3479	* call as long as the user provided buffer is large enough to hold the
3480	* message.
3481	*/
3482	static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3483	unsigned int optlen)
3484	{
3485	if (optlen != sizeof(u32))
3486	return -EINVAL;
3487
3488	/* Note: We double the receive buffer from what the user sets
3489	* it to be, also initial rwnd is based on rcvbuf/2.
3490	*/
3491	if (*val > (sk->sk_rcvbuf >> 1))
3492	return -EINVAL;
3493
3494	sctp_sk(sk)->pd_point = *val;
3495
3496	return 0; /* is this the right error code? */
3497	}
3498
3499	/*
3500	* 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3501	*
3502	* This option will allow a user to change the maximum burst of packets
3503	* that can be emitted by this association. Note that the default value
3504	* is 4, and some implementations may restrict this setting so that it
3505	* can only be lowered.
3506	*
3507	* NOTE: This text doesn't seem right. Do this on a socket basis with
3508	* future associations inheriting the socket value.
3509	*/
3510	static int sctp_setsockopt_maxburst(struct sock *sk,
3511	struct sctp_assoc_value *params,
3512	unsigned int optlen)
3513	{
3514	struct sctp_sock *sp = sctp_sk(sk);
3515	struct sctp_association *asoc;
3516	sctp_assoc_t assoc_id;
3517	u32 assoc_value;
3518
3519	if (optlen == sizeof(int)) {
3520	pr_warn_ratelimited(DEPRECATED
3521	"%s (pid %d) "
3522	"Use of int in max_burst socket option deprecated.\n"
3523	"Use struct sctp_assoc_value instead\n",
3524	current->comm, task_pid_nr(current));
3525	assoc_id = SCTP_FUTURE_ASSOC;
3526	assoc_value = *((int *)params);
3527	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3528	assoc_id = params->assoc_id;
3529	assoc_value = params->assoc_value;
3530	} else
3531	return -EINVAL;
3532
3533	asoc = sctp_id2assoc(sk, id: assoc_id);
3534	if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3535	return -EINVAL;
3536
3537	if (asoc) {
3538	asoc->max_burst = assoc_value;
3539
3540	return 0;
3541	}
3542
3543	if (sctp_style(sk, TCP))
3544	assoc_id = SCTP_FUTURE_ASSOC;
3545
3546	if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3547	sp->max_burst = assoc_value;
3548
3549	if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3550	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3551	asoc->max_burst = assoc_value;
3552
3553	return 0;
3554	}
3555
3556	/*
3557	* 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3558	*
3559	* This set option adds a chunk type that the user is requesting to be
3560	* received only in an authenticated way. Changes to the list of chunks
3561	* will only effect future associations on the socket.
3562	*/
3563	static int sctp_setsockopt_auth_chunk(struct sock *sk,
3564	struct sctp_authchunk *val,
3565	unsigned int optlen)
3566	{
3567	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3568
3569	if (!ep->auth_enable)
3570	return -EACCES;
3571
3572	if (optlen != sizeof(struct sctp_authchunk))
3573	return -EINVAL;
3574
3575	switch (val->sauth_chunk) {
3576	case SCTP_CID_INIT:
3577	case SCTP_CID_INIT_ACK:
3578	case SCTP_CID_SHUTDOWN_COMPLETE:
3579	case SCTP_CID_AUTH:
3580	return -EINVAL;
3581	}
3582
3583	/* add this chunk id to the endpoint */
3584	return sctp_auth_ep_add_chunkid(ep, chunk_id: val->sauth_chunk);
3585	}
3586
3587	/*
3588	* 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3589	*
3590	* This option gets or sets the list of HMAC algorithms that the local
3591	* endpoint requires the peer to use.
3592	*/
3593	static int sctp_setsockopt_hmac_ident(struct sock *sk,
3594	struct sctp_hmacalgo *hmacs,
3595	unsigned int optlen)
3596	{
3597	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3598	u32 idents;
3599
3600	if (!ep->auth_enable)
3601	return -EACCES;
3602
3603	if (optlen < sizeof(struct sctp_hmacalgo))
3604	return -EINVAL;
3605	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3606	SCTP_AUTH_NUM_HMACS * sizeof(u16));
3607
3608	idents = hmacs->shmac_num_idents;
3609	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3610	(idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3611	return -EINVAL;
3612
3613	return sctp_auth_ep_set_hmacs(ep, hmacs);
3614	}
3615
3616	/*
3617	* 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3618	*
3619	* This option will set a shared secret key which is used to build an
3620	* association shared key.
3621	*/
3622	static int sctp_setsockopt_auth_key(struct sock *sk,
3623	struct sctp_authkey *authkey,
3624	unsigned int optlen)
3625	{
3626	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3627	struct sctp_association *asoc;
3628	int ret = -EINVAL;
3629
3630	if (optlen <= sizeof(struct sctp_authkey))
3631	return -EINVAL;
3632	/* authkey->sca_keylength is u16, so optlen can't be bigger than
3633	* this.
3634	*/
3635	optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3636
3637	if (authkey->sca_keylength > optlen - sizeof(*authkey))
3638	goto out;
3639
3640	asoc = sctp_id2assoc(sk, id: authkey->sca_assoc_id);
3641	if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3642	sctp_style(sk, UDP))
3643	goto out;
3644
3645	if (asoc) {
3646	ret = sctp_auth_set_key(ep, asoc, auth_key: authkey);
3647	goto out;
3648	}
3649
3650	if (sctp_style(sk, TCP))
3651	authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3652
3653	if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3654	authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3655	ret = sctp_auth_set_key(ep, asoc, auth_key: authkey);
3656	if (ret)
3657	goto out;
3658	}
3659
3660	ret = 0;
3661
3662	if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3663	authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3664	list_for_each_entry(asoc, &ep->asocs, asocs) {
3665	int res = sctp_auth_set_key(ep, asoc, auth_key: authkey);
3666
3667	if (res && !ret)
3668	ret = res;
3669	}
3670	}
3671
3672	out:
3673	memzero_explicit(s: authkey, count: optlen);
3674	return ret;
3675	}
3676
3677	/*
3678	* 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3679	*
3680	* This option will get or set the active shared key to be used to build
3681	* the association shared key.
3682	*/
3683	static int sctp_setsockopt_active_key(struct sock *sk,
3684	struct sctp_authkeyid *val,
3685	unsigned int optlen)
3686	{
3687	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3688	struct sctp_association *asoc;
3689	int ret = 0;
3690
3691	if (optlen != sizeof(struct sctp_authkeyid))
3692	return -EINVAL;
3693
3694	asoc = sctp_id2assoc(sk, id: val->scact_assoc_id);
3695	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3696	sctp_style(sk, UDP))
3697	return -EINVAL;
3698
3699	if (asoc)
3700	return sctp_auth_set_active_key(ep, asoc, key_id: val->scact_keynumber);
3701
3702	if (sctp_style(sk, TCP))
3703	val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3704
3705	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3706	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3707	ret = sctp_auth_set_active_key(ep, asoc, key_id: val->scact_keynumber);
3708	if (ret)
3709	return ret;
3710	}
3711
3712	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3713	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3714	list_for_each_entry(asoc, &ep->asocs, asocs) {
3715	int res = sctp_auth_set_active_key(ep, asoc,
3716	key_id: val->scact_keynumber);
3717
3718	if (res && !ret)
3719	ret = res;
3720	}
3721	}
3722
3723	return ret;
3724	}
3725
3726	/*
3727	* 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3728	*
3729	* This set option will delete a shared secret key from use.
3730	*/
3731	static int sctp_setsockopt_del_key(struct sock *sk,
3732	struct sctp_authkeyid *val,
3733	unsigned int optlen)
3734	{
3735	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3736	struct sctp_association *asoc;
3737	int ret = 0;
3738
3739	if (optlen != sizeof(struct sctp_authkeyid))
3740	return -EINVAL;
3741
3742	asoc = sctp_id2assoc(sk, id: val->scact_assoc_id);
3743	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3744	sctp_style(sk, UDP))
3745	return -EINVAL;
3746
3747	if (asoc)
3748	return sctp_auth_del_key_id(ep, asoc, key_id: val->scact_keynumber);
3749
3750	if (sctp_style(sk, TCP))
3751	val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3752
3753	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3754	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3755	ret = sctp_auth_del_key_id(ep, asoc, key_id: val->scact_keynumber);
3756	if (ret)
3757	return ret;
3758	}
3759
3760	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3761	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3762	list_for_each_entry(asoc, &ep->asocs, asocs) {
3763	int res = sctp_auth_del_key_id(ep, asoc,
3764	key_id: val->scact_keynumber);
3765
3766	if (res && !ret)
3767	ret = res;
3768	}
3769	}
3770
3771	return ret;
3772	}
3773
3774	/*
3775	* 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3776	*
3777	* This set option will deactivate a shared secret key.
3778	*/
3779	static int sctp_setsockopt_deactivate_key(struct sock *sk,
3780	struct sctp_authkeyid *val,
3781	unsigned int optlen)
3782	{
3783	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3784	struct sctp_association *asoc;
3785	int ret = 0;
3786
3787	if (optlen != sizeof(struct sctp_authkeyid))
3788	return -EINVAL;
3789
3790	asoc = sctp_id2assoc(sk, id: val->scact_assoc_id);
3791	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3792	sctp_style(sk, UDP))
3793	return -EINVAL;
3794
3795	if (asoc)
3796	return sctp_auth_deact_key_id(ep, asoc, key_id: val->scact_keynumber);
3797
3798	if (sctp_style(sk, TCP))
3799	val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3800
3801	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3802	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3803	ret = sctp_auth_deact_key_id(ep, asoc, key_id: val->scact_keynumber);
3804	if (ret)
3805	return ret;
3806	}
3807
3808	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3809	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3810	list_for_each_entry(asoc, &ep->asocs, asocs) {
3811	int res = sctp_auth_deact_key_id(ep, asoc,
3812	key_id: val->scact_keynumber);
3813
3814	if (res && !ret)
3815	ret = res;
3816	}
3817	}
3818
3819	return ret;
3820	}
3821
3822	/*
3823	* 8.1.23 SCTP_AUTO_ASCONF
3824	*
3825	* This option will enable or disable the use of the automatic generation of
3826	* ASCONF chunks to add and delete addresses to an existing association. Note
3827	* that this option has two caveats namely: a) it only affects sockets that
3828	* are bound to all addresses available to the SCTP stack, and b) the system
3829	* administrator may have an overriding control that turns the ASCONF feature
3830	* off no matter what setting the socket option may have.
3831	* This option expects an integer boolean flag, where a non-zero value turns on
3832	* the option, and a zero value turns off the option.
3833	* Note. In this implementation, socket operation overrides default parameter
3834	* being set by sysctl as well as FreeBSD implementation
3835	*/
3836	static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3837	unsigned int optlen)
3838	{
3839	struct sctp_sock *sp = sctp_sk(sk);
3840
3841	if (optlen < sizeof(int))
3842	return -EINVAL;
3843	if (!sctp_is_ep_boundall(sk) && *val)
3844	return -EINVAL;
3845	if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3846	return 0;
3847
3848	spin_lock_bh(lock: &sock_net(sk)->sctp.addr_wq_lock);
3849	if (*val == 0 && sp->do_auto_asconf) {
3850	list_del(entry: &sp->auto_asconf_list);
3851	sp->do_auto_asconf = 0;
3852	} else if (*val && !sp->do_auto_asconf) {
3853	list_add_tail(new: &sp->auto_asconf_list,
3854	head: &sock_net(sk)->sctp.auto_asconf_splist);
3855	sp->do_auto_asconf = 1;
3856	}
3857	spin_unlock_bh(lock: &sock_net(sk)->sctp.addr_wq_lock);
3858	return 0;
3859	}
3860
3861	/*
3862	* SCTP_PEER_ADDR_THLDS
3863	*
3864	* This option allows us to alter the partially failed threshold for one or all
3865	* transports in an association. See Section 6.1 of:
3866	* http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3867	*/
3868	static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3869	struct sctp_paddrthlds_v2 *val,
3870	unsigned int optlen, bool v2)
3871	{
3872	struct sctp_transport *trans;
3873	struct sctp_association *asoc;
3874	int len;
3875
3876	len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3877	if (optlen < len)
3878	return -EINVAL;
3879
3880	if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3881	return -EINVAL;
3882
3883	if (!sctp_is_any(sk, addr: (const union sctp_addr *)&val->spt_address)) {
3884	trans = sctp_addr_id2transport(sk, addr: &val->spt_address,
3885	id: val->spt_assoc_id);
3886	if (!trans)
3887	return -ENOENT;
3888
3889	if (val->spt_pathmaxrxt)
3890	trans->pathmaxrxt = val->spt_pathmaxrxt;
3891	if (v2)
3892	trans->ps_retrans = val->spt_pathcpthld;
3893	trans->pf_retrans = val->spt_pathpfthld;
3894
3895	return 0;
3896	}
3897
3898	asoc = sctp_id2assoc(sk, id: val->spt_assoc_id);
3899	if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3900	sctp_style(sk, UDP))
3901	return -EINVAL;
3902
3903	if (asoc) {
3904	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3905	transports) {
3906	if (val->spt_pathmaxrxt)
3907	trans->pathmaxrxt = val->spt_pathmaxrxt;
3908	if (v2)
3909	trans->ps_retrans = val->spt_pathcpthld;
3910	trans->pf_retrans = val->spt_pathpfthld;
3911	}
3912
3913	if (val->spt_pathmaxrxt)
3914	asoc->pathmaxrxt = val->spt_pathmaxrxt;
3915	if (v2)
3916	asoc->ps_retrans = val->spt_pathcpthld;
3917	asoc->pf_retrans = val->spt_pathpfthld;
3918	} else {
3919	struct sctp_sock *sp = sctp_sk(sk);
3920
3921	if (val->spt_pathmaxrxt)
3922	sp->pathmaxrxt = val->spt_pathmaxrxt;
3923	if (v2)
3924	sp->ps_retrans = val->spt_pathcpthld;
3925	sp->pf_retrans = val->spt_pathpfthld;
3926	}
3927
3928	return 0;
3929	}
3930
3931	static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3932	unsigned int optlen)
3933	{
3934	if (optlen < sizeof(int))
3935	return -EINVAL;
3936
3937	sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3938
3939	return 0;
3940	}
3941
3942	static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3943	unsigned int optlen)
3944	{
3945	if (optlen < sizeof(int))
3946	return -EINVAL;
3947
3948	sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3949
3950	return 0;
3951	}
3952
3953	static int sctp_setsockopt_pr_supported(struct sock *sk,
3954	struct sctp_assoc_value *params,
3955	unsigned int optlen)
3956	{
3957	struct sctp_association *asoc;
3958
3959	if (optlen != sizeof(*params))
3960	return -EINVAL;
3961
3962	asoc = sctp_id2assoc(sk, id: params->assoc_id);
3963	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3964	sctp_style(sk, UDP))
3965	return -EINVAL;
3966
3967	sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3968
3969	return 0;
3970	}
3971
3972	static int sctp_setsockopt_default_prinfo(struct sock *sk,
3973	struct sctp_default_prinfo *info,
3974	unsigned int optlen)
3975	{
3976	struct sctp_sock *sp = sctp_sk(sk);
3977	struct sctp_association *asoc;
3978	int retval = -EINVAL;
3979
3980	if (optlen != sizeof(*info))
3981	goto out;
3982
3983	if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3984	goto out;
3985
3986	if (info->pr_policy == SCTP_PR_SCTP_NONE)
3987	info->pr_value = 0;
3988
3989	asoc = sctp_id2assoc(sk, id: info->pr_assoc_id);
3990	if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3991	sctp_style(sk, UDP))
3992	goto out;
3993
3994	retval = 0;
3995
3996	if (asoc) {
3997	SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3998	asoc->default_timetolive = info->pr_value;
3999	goto out;
4000	}
4001
4002	if (sctp_style(sk, TCP))
4003	info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4004
4005	if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4006	info->pr_assoc_id == SCTP_ALL_ASSOC) {
4007	SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4008	sp->default_timetolive = info->pr_value;
4009	}
4010
4011	if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4012	info->pr_assoc_id == SCTP_ALL_ASSOC) {
4013	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4014	SCTP_PR_SET_POLICY(asoc->default_flags,
4015	info->pr_policy);
4016	asoc->default_timetolive = info->pr_value;
4017	}
4018	}
4019
4020	out:
4021	return retval;
4022	}
4023
4024	static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4025	struct sctp_assoc_value *params,
4026	unsigned int optlen)
4027	{
4028	struct sctp_association *asoc;
4029	int retval = -EINVAL;
4030
4031	if (optlen != sizeof(*params))
4032	goto out;
4033
4034	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4035	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4036	sctp_style(sk, UDP))
4037	goto out;
4038
4039	sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4040
4041	retval = 0;
4042
4043	out:
4044	return retval;
4045	}
4046
4047	static int sctp_setsockopt_enable_strreset(struct sock *sk,
4048	struct sctp_assoc_value *params,
4049	unsigned int optlen)
4050	{
4051	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4052	struct sctp_association *asoc;
4053	int retval = -EINVAL;
4054
4055	if (optlen != sizeof(*params))
4056	goto out;
4057
4058	if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4059	goto out;
4060
4061	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4062	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4063	sctp_style(sk, UDP))
4064	goto out;
4065
4066	retval = 0;
4067
4068	if (asoc) {
4069	asoc->strreset_enable = params->assoc_value;
4070	goto out;
4071	}
4072
4073	if (sctp_style(sk, TCP))
4074	params->assoc_id = SCTP_FUTURE_ASSOC;
4075
4076	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4077	params->assoc_id == SCTP_ALL_ASSOC)
4078	ep->strreset_enable = params->assoc_value;
4079
4080	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4081	params->assoc_id == SCTP_ALL_ASSOC)
4082	list_for_each_entry(asoc, &ep->asocs, asocs)
4083	asoc->strreset_enable = params->assoc_value;
4084
4085	out:
4086	return retval;
4087	}
4088
4089	static int sctp_setsockopt_reset_streams(struct sock *sk,
4090	struct sctp_reset_streams *params,
4091	unsigned int optlen)
4092	{
4093	struct sctp_association *asoc;
4094
4095	if (optlen < sizeof(*params))
4096	return -EINVAL;
4097	/* srs_number_streams is u16, so optlen can't be bigger than this. */
4098	optlen = min_t(unsigned int, optlen, USHRT_MAX +
4099	sizeof(__u16) * sizeof(*params));
4100
4101	if (params->srs_number_streams * sizeof(__u16) >
4102	optlen - sizeof(*params))
4103	return -EINVAL;
4104
4105	asoc = sctp_id2assoc(sk, id: params->srs_assoc_id);
4106	if (!asoc)
4107	return -EINVAL;
4108
4109	return sctp_send_reset_streams(asoc, params);
4110	}
4111
4112	static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4113	unsigned int optlen)
4114	{
4115	struct sctp_association *asoc;
4116
4117	if (optlen != sizeof(*associd))
4118	return -EINVAL;
4119
4120	asoc = sctp_id2assoc(sk, id: *associd);
4121	if (!asoc)
4122	return -EINVAL;
4123
4124	return sctp_send_reset_assoc(asoc);
4125	}
4126
4127	static int sctp_setsockopt_add_streams(struct sock *sk,
4128	struct sctp_add_streams *params,
4129	unsigned int optlen)
4130	{
4131	struct sctp_association *asoc;
4132
4133	if (optlen != sizeof(*params))
4134	return -EINVAL;
4135
4136	asoc = sctp_id2assoc(sk, id: params->sas_assoc_id);
4137	if (!asoc)
4138	return -EINVAL;
4139
4140	return sctp_send_add_streams(asoc, params);
4141	}
4142
4143	static int sctp_setsockopt_scheduler(struct sock *sk,
4144	struct sctp_assoc_value *params,
4145	unsigned int optlen)
4146	{
4147	struct sctp_sock *sp = sctp_sk(sk);
4148	struct sctp_association *asoc;
4149	int retval = 0;
4150
4151	if (optlen < sizeof(*params))
4152	return -EINVAL;
4153
4154	if (params->assoc_value > SCTP_SS_MAX)
4155	return -EINVAL;
4156
4157	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4158	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4159	sctp_style(sk, UDP))
4160	return -EINVAL;
4161
4162	if (asoc)
4163	return sctp_sched_set_sched(asoc, sched: params->assoc_value);
4164
4165	if (sctp_style(sk, TCP))
4166	params->assoc_id = SCTP_FUTURE_ASSOC;
4167
4168	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4169	params->assoc_id == SCTP_ALL_ASSOC)
4170	sp->default_ss = params->assoc_value;
4171
4172	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4173	params->assoc_id == SCTP_ALL_ASSOC) {
4174	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4175	int ret = sctp_sched_set_sched(asoc,
4176	sched: params->assoc_value);
4177
4178	if (ret && !retval)
4179	retval = ret;
4180	}
4181	}
4182
4183	return retval;
4184	}
4185
4186	static int sctp_setsockopt_scheduler_value(struct sock *sk,
4187	struct sctp_stream_value *params,
4188	unsigned int optlen)
4189	{
4190	struct sctp_association *asoc;
4191	int retval = -EINVAL;
4192
4193	if (optlen < sizeof(*params))
4194	goto out;
4195
4196	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4197	if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4198	sctp_style(sk, UDP))
4199	goto out;
4200
4201	if (asoc) {
4202	retval = sctp_sched_set_value(asoc, sid: params->stream_id,
4203	value: params->stream_value, GFP_KERNEL);
4204	goto out;
4205	}
4206
4207	retval = 0;
4208
4209	list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4210	int ret = sctp_sched_set_value(asoc, sid: params->stream_id,
4211	value: params->stream_value,
4212	GFP_KERNEL);
4213	if (ret && !retval) /* try to return the 1st error. */
4214	retval = ret;
4215	}
4216
4217	out:
4218	return retval;
4219	}
4220
4221	static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4222	struct sctp_assoc_value *p,
4223	unsigned int optlen)
4224	{
4225	struct sctp_sock *sp = sctp_sk(sk);
4226	struct sctp_association *asoc;
4227
4228	if (optlen < sizeof(*p))
4229	return -EINVAL;
4230
4231	asoc = sctp_id2assoc(sk, id: p->assoc_id);
4232	if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4233	return -EINVAL;
4234
4235	if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4236	return -EPERM;
4237	}
4238
4239	sp->ep->intl_enable = !!p->assoc_value;
4240	return 0;
4241	}
4242
4243	static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4244	unsigned int optlen)
4245	{
4246	if (!sctp_style(sk, TCP))
4247	return -EOPNOTSUPP;
4248
4249	if (sctp_sk(sk)->ep->base.bind_addr.port)
4250	return -EFAULT;
4251
4252	if (optlen < sizeof(int))
4253	return -EINVAL;
4254
4255	sctp_sk(sk)->reuse = !!*val;
4256
4257	return 0;
4258	}
4259
4260	static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4261	struct sctp_association *asoc)
4262	{
4263	struct sctp_ulpevent *event;
4264
4265	sctp_ulpevent_type_set(subscribe: &asoc->subscribe, sn_type: param->se_type, on: param->se_on);
4266
4267	if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4268	if (sctp_outq_is_empty(&asoc->outqueue)) {
4269	event = sctp_ulpevent_make_sender_dry_event(asoc,
4270	GFP_USER | __GFP_NOWARN);
4271	if (!event)
4272	return -ENOMEM;
4273
4274	asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4275	}
4276	}
4277
4278	return 0;
4279	}
4280
4281	static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4282	unsigned int optlen)
4283	{
4284	struct sctp_sock *sp = sctp_sk(sk);
4285	struct sctp_association *asoc;
4286	int retval = 0;
4287
4288	if (optlen < sizeof(*param))
4289	return -EINVAL;
4290
4291	if (param->se_type < SCTP_SN_TYPE_BASE ||
4292	param->se_type > SCTP_SN_TYPE_MAX)
4293	return -EINVAL;
4294
4295	asoc = sctp_id2assoc(sk, id: param->se_assoc_id);
4296	if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4297	sctp_style(sk, UDP))
4298	return -EINVAL;
4299
4300	if (asoc)
4301	return sctp_assoc_ulpevent_type_set(param, asoc);
4302
4303	if (sctp_style(sk, TCP))
4304	param->se_assoc_id = SCTP_FUTURE_ASSOC;
4305
4306	if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4307	param->se_assoc_id == SCTP_ALL_ASSOC)
4308	sctp_ulpevent_type_set(subscribe: &sp->subscribe,
4309	sn_type: param->se_type, on: param->se_on);
4310
4311	if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4312	param->se_assoc_id == SCTP_ALL_ASSOC) {
4313	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4314	int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4315
4316	if (ret && !retval)
4317	retval = ret;
4318	}
4319	}
4320
4321	return retval;
4322	}
4323
4324	static int sctp_setsockopt_asconf_supported(struct sock *sk,
4325	struct sctp_assoc_value *params,
4326	unsigned int optlen)
4327	{
4328	struct sctp_association *asoc;
4329	struct sctp_endpoint *ep;
4330	int retval = -EINVAL;
4331
4332	if (optlen != sizeof(*params))
4333	goto out;
4334
4335	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4336	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4337	sctp_style(sk, UDP))
4338	goto out;
4339
4340	ep = sctp_sk(sk)->ep;
4341	ep->asconf_enable = !!params->assoc_value;
4342
4343	if (ep->asconf_enable && ep->auth_enable) {
4344	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF);
4345	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF_ACK);
4346	}
4347
4348	retval = 0;
4349
4350	out:
4351	return retval;
4352	}
4353
4354	static int sctp_setsockopt_auth_supported(struct sock *sk,
4355	struct sctp_assoc_value *params,
4356	unsigned int optlen)
4357	{
4358	struct sctp_association *asoc;
4359	struct sctp_endpoint *ep;
4360	int retval = -EINVAL;
4361
4362	if (optlen != sizeof(*params))
4363	goto out;
4364
4365	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4366	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4367	sctp_style(sk, UDP))
4368	goto out;
4369
4370	ep = sctp_sk(sk)->ep;
4371	if (params->assoc_value) {
4372	retval = sctp_auth_init(ep, GFP_KERNEL);
4373	if (retval)
4374	goto out;
4375	if (ep->asconf_enable) {
4376	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF);
4377	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF_ACK);
4378	}
4379	}
4380
4381	ep->auth_enable = !!params->assoc_value;
4382	retval = 0;
4383
4384	out:
4385	return retval;
4386	}
4387
4388	static int sctp_setsockopt_ecn_supported(struct sock *sk,
4389	struct sctp_assoc_value *params,
4390	unsigned int optlen)
4391	{
4392	struct sctp_association *asoc;
4393	int retval = -EINVAL;
4394
4395	if (optlen != sizeof(*params))
4396	goto out;
4397
4398	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4399	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4400	sctp_style(sk, UDP))
4401	goto out;
4402
4403	sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4404	retval = 0;
4405
4406	out:
4407	return retval;
4408	}
4409
4410	static int sctp_setsockopt_pf_expose(struct sock *sk,
4411	struct sctp_assoc_value *params,
4412	unsigned int optlen)
4413	{
4414	struct sctp_association *asoc;
4415	int retval = -EINVAL;
4416
4417	if (optlen != sizeof(*params))
4418	goto out;
4419
4420	if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4421	goto out;
4422
4423	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4424	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4425	sctp_style(sk, UDP))
4426	goto out;
4427
4428	if (asoc)
4429	asoc->pf_expose = params->assoc_value;
4430	else
4431	sctp_sk(sk)->pf_expose = params->assoc_value;
4432	retval = 0;
4433
4434	out:
4435	return retval;
4436	}
4437
4438	static int sctp_setsockopt_encap_port(struct sock *sk,
4439	struct sctp_udpencaps *encap,
4440	unsigned int optlen)
4441	{
4442	struct sctp_association *asoc;
4443	struct sctp_transport *t;
4444	__be16 encap_port;
4445
4446	if (optlen != sizeof(*encap))
4447	return -EINVAL;
4448
4449	/* If an address other than INADDR_ANY is specified, and
4450	* no transport is found, then the request is invalid.
4451	*/
4452	encap_port = (__force __be16)encap->sue_port;
4453	if (!sctp_is_any(sk, addr: (union sctp_addr *)&encap->sue_address)) {
4454	t = sctp_addr_id2transport(sk, addr: &encap->sue_address,
4455	id: encap->sue_assoc_id);
4456	if (!t)
4457	return -EINVAL;
4458
4459	t->encap_port = encap_port;
4460	return 0;
4461	}
4462
4463	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4464	* socket is a one to many style socket, and an association
4465	* was not found, then the id was invalid.
4466	*/
4467	asoc = sctp_id2assoc(sk, id: encap->sue_assoc_id);
4468	if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4469	sctp_style(sk, UDP))
4470	return -EINVAL;
4471
4472	/* If changes are for association, also apply encap_port to
4473	* each transport.
4474	*/
4475	if (asoc) {
4476	list_for_each_entry(t, &asoc->peer.transport_addr_list,
4477	transports)
4478	t->encap_port = encap_port;
4479
4480	asoc->encap_port = encap_port;
4481	return 0;
4482	}
4483
4484	sctp_sk(sk)->encap_port = encap_port;
4485	return 0;
4486	}
4487
4488	static int sctp_setsockopt_probe_interval(struct sock *sk,
4489	struct sctp_probeinterval *params,
4490	unsigned int optlen)
4491	{
4492	struct sctp_association *asoc;
4493	struct sctp_transport *t;
4494	__u32 probe_interval;
4495
4496	if (optlen != sizeof(*params))
4497	return -EINVAL;
4498
4499	probe_interval = params->spi_interval;
4500	if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4501	return -EINVAL;
4502
4503	/* If an address other than INADDR_ANY is specified, and
4504	* no transport is found, then the request is invalid.
4505	*/
4506	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params->spi_address)) {
4507	t = sctp_addr_id2transport(sk, addr: &params->spi_address,
4508	id: params->spi_assoc_id);
4509	if (!t)
4510	return -EINVAL;
4511
4512	t->probe_interval = msecs_to_jiffies(m: probe_interval);
4513	sctp_transport_pl_reset(t);
4514	return 0;
4515	}
4516
4517	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4518	* socket is a one to many style socket, and an association
4519	* was not found, then the id was invalid.
4520	*/
4521	asoc = sctp_id2assoc(sk, id: params->spi_assoc_id);
4522	if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4523	sctp_style(sk, UDP))
4524	return -EINVAL;
4525
4526	/* If changes are for association, also apply probe_interval to
4527	* each transport.
4528	*/
4529	if (asoc) {
4530	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4531	t->probe_interval = msecs_to_jiffies(m: probe_interval);
4532	sctp_transport_pl_reset(t);
4533	}
4534
4535	asoc->probe_interval = msecs_to_jiffies(m: probe_interval);
4536	return 0;
4537	}
4538
4539	sctp_sk(sk)->probe_interval = probe_interval;
4540	return 0;
4541	}
4542
4543	/* API 6.2 setsockopt(), getsockopt()
4544	*
4545	* Applications use setsockopt() and getsockopt() to set or retrieve
4546	* socket options. Socket options are used to change the default
4547	* behavior of sockets calls. They are described in Section 7.
4548	*
4549	* The syntax is:
4550	*
4551	* ret = getsockopt(int sd, int level, int optname, void __user *optval,
4552	* int __user *optlen);
4553	* ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4554	* int optlen);
4555	*
4556	* sd - the socket descript.
4557	* level - set to IPPROTO_SCTP for all SCTP options.
4558	* optname - the option name.
4559	* optval - the buffer to store the value of the option.
4560	* optlen - the size of the buffer.
4561	*/
4562	static int sctp_setsockopt(struct sock *sk, int level, int optname,
4563	sockptr_t optval, unsigned int optlen)
4564	{
4565	void *kopt = NULL;
4566	int retval = 0;
4567
4568	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4569
4570	/* I can hardly begin to describe how wrong this is. This is
4571	* so broken as to be worse than useless. The API draft
4572	* REALLY is NOT helpful here... I am not convinced that the
4573	* semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4574	* are at all well-founded.
4575	*/
4576	if (level != SOL_SCTP) {
4577	struct sctp_af *af = sctp_sk(sk)->pf->af;
4578
4579	return af->setsockopt(sk, level, optname, optval, optlen);
4580	}
4581
4582	if (optlen > 0) {
4583	/* Trim it to the biggest size sctp sockopt may need if necessary */
4584	optlen = min_t(unsigned int, optlen,
4585	PAGE_ALIGN(USHRT_MAX +
4586	sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4587	kopt = memdup_sockptr(src: optval, len: optlen);
4588	if (IS_ERR(ptr: kopt))
4589	return PTR_ERR(ptr: kopt);
4590	}
4591
4592	lock_sock(sk);
4593
4594	switch (optname) {
4595	case SCTP_SOCKOPT_BINDX_ADD:
4596	/* 'optlen' is the size of the addresses buffer. */
4597	retval = sctp_setsockopt_bindx(sk, addrs: kopt, addrs_size: optlen,
4598	SCTP_BINDX_ADD_ADDR);
4599	break;
4600
4601	case SCTP_SOCKOPT_BINDX_REM:
4602	/* 'optlen' is the size of the addresses buffer. */
4603	retval = sctp_setsockopt_bindx(sk, addrs: kopt, addrs_size: optlen,
4604	SCTP_BINDX_REM_ADDR);
4605	break;
4606
4607	case SCTP_SOCKOPT_CONNECTX_OLD:
4608	/* 'optlen' is the size of the addresses buffer. */
4609	retval = sctp_setsockopt_connectx_old(sk, kaddrs: kopt, addrs_size: optlen);
4610	break;
4611
4612	case SCTP_SOCKOPT_CONNECTX:
4613	/* 'optlen' is the size of the addresses buffer. */
4614	retval = sctp_setsockopt_connectx(sk, kaddrs: kopt, addrs_size: optlen);
4615	break;
4616
4617	case SCTP_DISABLE_FRAGMENTS:
4618	retval = sctp_setsockopt_disable_fragments(sk, val: kopt, optlen);
4619	break;
4620
4621	case SCTP_EVENTS:
4622	retval = sctp_setsockopt_events(sk, sn_type: kopt, optlen);
4623	break;
4624
4625	case SCTP_AUTOCLOSE:
4626	retval = sctp_setsockopt_autoclose(sk, optval: kopt, optlen);
4627	break;
4628
4629	case SCTP_PEER_ADDR_PARAMS:
4630	retval = sctp_setsockopt_peer_addr_params(sk, params: kopt, optlen);
4631	break;
4632
4633	case SCTP_DELAYED_SACK:
4634	retval = sctp_setsockopt_delayed_ack(sk, params: kopt, optlen);
4635	break;
4636	case SCTP_PARTIAL_DELIVERY_POINT:
4637	retval = sctp_setsockopt_partial_delivery_point(sk, val: kopt, optlen);
4638	break;
4639
4640	case SCTP_INITMSG:
4641	retval = sctp_setsockopt_initmsg(sk, sinit: kopt, optlen);
4642	break;
4643	case SCTP_DEFAULT_SEND_PARAM:
4644	retval = sctp_setsockopt_default_send_param(sk, info: kopt, optlen);
4645	break;
4646	case SCTP_DEFAULT_SNDINFO:
4647	retval = sctp_setsockopt_default_sndinfo(sk, info: kopt, optlen);
4648	break;
4649	case SCTP_PRIMARY_ADDR:
4650	retval = sctp_setsockopt_primary_addr(sk, prim: kopt, optlen);
4651	break;
4652	case SCTP_SET_PEER_PRIMARY_ADDR:
4653	retval = sctp_setsockopt_peer_primary_addr(sk, prim: kopt, optlen);
4654	break;
4655	case SCTP_NODELAY:
4656	retval = sctp_setsockopt_nodelay(sk, val: kopt, optlen);
4657	break;
4658	case SCTP_RTOINFO:
4659	retval = sctp_setsockopt_rtoinfo(sk, rtoinfo: kopt, optlen);
4660	break;
4661	case SCTP_ASSOCINFO:
4662	retval = sctp_setsockopt_associnfo(sk, assocparams: kopt, optlen);
4663	break;
4664	case SCTP_I_WANT_MAPPED_V4_ADDR:
4665	retval = sctp_setsockopt_mappedv4(sk, val: kopt, optlen);
4666	break;
4667	case SCTP_MAXSEG:
4668	retval = sctp_setsockopt_maxseg(sk, params: kopt, optlen);
4669	break;
4670	case SCTP_ADAPTATION_LAYER:
4671	retval = sctp_setsockopt_adaptation_layer(sk, adapt: kopt, optlen);
4672	break;
4673	case SCTP_CONTEXT:
4674	retval = sctp_setsockopt_context(sk, params: kopt, optlen);
4675	break;
4676	case SCTP_FRAGMENT_INTERLEAVE:
4677	retval = sctp_setsockopt_fragment_interleave(sk, val: kopt, optlen);
4678	break;
4679	case SCTP_MAX_BURST:
4680	retval = sctp_setsockopt_maxburst(sk, params: kopt, optlen);
4681	break;
4682	case SCTP_AUTH_CHUNK:
4683	retval = sctp_setsockopt_auth_chunk(sk, val: kopt, optlen);
4684	break;
4685	case SCTP_HMAC_IDENT:
4686	retval = sctp_setsockopt_hmac_ident(sk, hmacs: kopt, optlen);
4687	break;
4688	case SCTP_AUTH_KEY:
4689	retval = sctp_setsockopt_auth_key(sk, authkey: kopt, optlen);
4690	break;
4691	case SCTP_AUTH_ACTIVE_KEY:
4692	retval = sctp_setsockopt_active_key(sk, val: kopt, optlen);
4693	break;
4694	case SCTP_AUTH_DELETE_KEY:
4695	retval = sctp_setsockopt_del_key(sk, val: kopt, optlen);
4696	break;
4697	case SCTP_AUTH_DEACTIVATE_KEY:
4698	retval = sctp_setsockopt_deactivate_key(sk, val: kopt, optlen);
4699	break;
4700	case SCTP_AUTO_ASCONF:
4701	retval = sctp_setsockopt_auto_asconf(sk, val: kopt, optlen);
4702	break;
4703	case SCTP_PEER_ADDR_THLDS:
4704	retval = sctp_setsockopt_paddr_thresholds(sk, val: kopt, optlen,
4705	v2: false);
4706	break;
4707	case SCTP_PEER_ADDR_THLDS_V2:
4708	retval = sctp_setsockopt_paddr_thresholds(sk, val: kopt, optlen,
4709	v2: true);
4710	break;
4711	case SCTP_RECVRCVINFO:
4712	retval = sctp_setsockopt_recvrcvinfo(sk, val: kopt, optlen);
4713	break;
4714	case SCTP_RECVNXTINFO:
4715	retval = sctp_setsockopt_recvnxtinfo(sk, val: kopt, optlen);
4716	break;
4717	case SCTP_PR_SUPPORTED:
4718	retval = sctp_setsockopt_pr_supported(sk, params: kopt, optlen);
4719	break;
4720	case SCTP_DEFAULT_PRINFO:
4721	retval = sctp_setsockopt_default_prinfo(sk, info: kopt, optlen);
4722	break;
4723	case SCTP_RECONFIG_SUPPORTED:
4724	retval = sctp_setsockopt_reconfig_supported(sk, params: kopt, optlen);
4725	break;
4726	case SCTP_ENABLE_STREAM_RESET:
4727	retval = sctp_setsockopt_enable_strreset(sk, params: kopt, optlen);
4728	break;
4729	case SCTP_RESET_STREAMS:
4730	retval = sctp_setsockopt_reset_streams(sk, params: kopt, optlen);
4731	break;
4732	case SCTP_RESET_ASSOC:
4733	retval = sctp_setsockopt_reset_assoc(sk, associd: kopt, optlen);
4734	break;
4735	case SCTP_ADD_STREAMS:
4736	retval = sctp_setsockopt_add_streams(sk, params: kopt, optlen);
4737	break;
4738	case SCTP_STREAM_SCHEDULER:
4739	retval = sctp_setsockopt_scheduler(sk, params: kopt, optlen);
4740	break;
4741	case SCTP_STREAM_SCHEDULER_VALUE:
4742	retval = sctp_setsockopt_scheduler_value(sk, params: kopt, optlen);
4743	break;
4744	case SCTP_INTERLEAVING_SUPPORTED:
4745	retval = sctp_setsockopt_interleaving_supported(sk, p: kopt,
4746	optlen);
4747	break;
4748	case SCTP_REUSE_PORT:
4749	retval = sctp_setsockopt_reuse_port(sk, val: kopt, optlen);
4750	break;
4751	case SCTP_EVENT:
4752	retval = sctp_setsockopt_event(sk, param: kopt, optlen);
4753	break;
4754	case SCTP_ASCONF_SUPPORTED:
4755	retval = sctp_setsockopt_asconf_supported(sk, params: kopt, optlen);
4756	break;
4757	case SCTP_AUTH_SUPPORTED:
4758	retval = sctp_setsockopt_auth_supported(sk, params: kopt, optlen);
4759	break;
4760	case SCTP_ECN_SUPPORTED:
4761	retval = sctp_setsockopt_ecn_supported(sk, params: kopt, optlen);
4762	break;
4763	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4764	retval = sctp_setsockopt_pf_expose(sk, params: kopt, optlen);
4765	break;
4766	case SCTP_REMOTE_UDP_ENCAPS_PORT:
4767	retval = sctp_setsockopt_encap_port(sk, encap: kopt, optlen);
4768	break;
4769	case SCTP_PLPMTUD_PROBE_INTERVAL:
4770	retval = sctp_setsockopt_probe_interval(sk, params: kopt, optlen);
4771	break;
4772	default:
4773	retval = -ENOPROTOOPT;
4774	break;
4775	}
4776
4777	release_sock(sk);
4778	kfree(objp: kopt);
4779	return retval;
4780	}
4781
4782	/* API 3.1.6 connect() - UDP Style Syntax
4783	*
4784	* An application may use the connect() call in the UDP model to initiate an
4785	* association without sending data.
4786	*
4787	* The syntax is:
4788	*
4789	* ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4790	*
4791	* sd: the socket descriptor to have a new association added to.
4792	*
4793	* nam: the address structure (either struct sockaddr_in or struct
4794	* sockaddr_in6 defined in RFC2553 [7]).
4795	*
4796	* len: the size of the address.
4797	*/
4798	static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4799	int addr_len, int flags)
4800	{
4801	struct sctp_af *af;
4802	int err = -EINVAL;
4803
4804	lock_sock(sk);
4805	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4806	addr, addr_len);
4807
4808	/* Validate addr_len before calling common connect/connectx routine. */
4809	af = sctp_get_af_specific(addr->sa_family);
4810	if (af && addr_len >= af->sockaddr_len)
4811	err = __sctp_connect(sk, kaddrs: addr, addrs_size: af->sockaddr_len, flags, NULL);
4812
4813	release_sock(sk);
4814	return err;
4815	}
4816
4817	int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4818	int addr_len, int flags)
4819	{
4820	if (addr_len < sizeof(uaddr->sa_family))
4821	return -EINVAL;
4822
4823	if (uaddr->sa_family == AF_UNSPEC)
4824	return -EOPNOTSUPP;
4825
4826	return sctp_connect(sk: sock->sk, addr: uaddr, addr_len, flags);
4827	}
4828
4829	/* FIXME: Write comments. */
4830	static int sctp_disconnect(struct sock *sk, int flags)
4831	{
4832	return -EOPNOTSUPP; /* STUB */
4833	}
4834
4835	/* 4.1.4 accept() - TCP Style Syntax
4836	*
4837	* Applications use accept() call to remove an established SCTP
4838	* association from the accept queue of the endpoint. A new socket
4839	* descriptor will be returned from accept() to represent the newly
4840	* formed association.
4841	*/
4842	static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4843	{
4844	struct sctp_sock *sp;
4845	struct sctp_endpoint *ep;
4846	struct sock *newsk = NULL;
4847	struct sctp_association *asoc;
4848	long timeo;
4849	int error = 0;
4850
4851	lock_sock(sk);
4852
4853	sp = sctp_sk(sk);
4854	ep = sp->ep;
4855
4856	if (!sctp_style(sk, TCP)) {
4857	error = -EOPNOTSUPP;
4858	goto out;
4859	}
4860
4861	if (!sctp_sstate(sk, LISTENING)) {
4862	error = -EINVAL;
4863	goto out;
4864	}
4865
4866	timeo = sock_rcvtimeo(sk, noblock: flags & O_NONBLOCK);
4867
4868	error = sctp_wait_for_accept(sk, timeo);
4869	if (error)
4870	goto out;
4871
4872	/* We treat the list of associations on the endpoint as the accept
4873	* queue and pick the first association on the list.
4874	*/
4875	asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4876
4877	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4878	if (!newsk) {
4879	error = -ENOMEM;
4880	goto out;
4881	}
4882
4883	/* Populate the fields of the newsk from the oldsk and migrate the
4884	* asoc to the newsk.
4885	*/
4886	error = sctp_sock_migrate(oldsk: sk, newsk, assoc: asoc, type: SCTP_SOCKET_TCP);
4887	if (error) {
4888	sk_common_release(sk: newsk);
4889	newsk = NULL;
4890	}
4891
4892	out:
4893	release_sock(sk);
4894	*err = error;
4895	return newsk;
4896	}
4897
4898	/* The SCTP ioctl handler. */
4899	static int sctp_ioctl(struct sock *sk, int cmd, int *karg)
4900	{
4901	int rc = -ENOTCONN;
4902
4903	lock_sock(sk);
4904
4905	/*
4906	* SEQPACKET-style sockets in LISTENING state are valid, for
4907	* SCTP, so only discard TCP-style sockets in LISTENING state.
4908	*/
4909	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4910	goto out;
4911
4912	switch (cmd) {
4913	case SIOCINQ: {
4914	struct sk_buff *skb;
4915	*karg = 0;
4916
4917	skb = skb_peek(list_: &sk->sk_receive_queue);
4918	if (skb != NULL) {
4919	/*
4920	* We will only return the amount of this packet since
4921	* that is all that will be read.
4922	*/
4923	*karg = skb->len;
4924	}
4925	rc = 0;
4926	break;
4927	}
4928	default:
4929	rc = -ENOIOCTLCMD;
4930	break;
4931	}
4932	out:
4933	release_sock(sk);
4934	return rc;
4935	}
4936
4937	/* This is the function which gets called during socket creation to
4938	* initialized the SCTP-specific portion of the sock.
4939	* The sock structure should already be zero-filled memory.
4940	*/
4941	static int sctp_init_sock(struct sock *sk)
4942	{
4943	struct net *net = sock_net(sk);
4944	struct sctp_sock *sp;
4945
4946	pr_debug("%s: sk:%p\n", __func__, sk);
4947
4948	sp = sctp_sk(sk);
4949
4950	/* Initialize the SCTP per socket area. */
4951	switch (sk->sk_type) {
4952	case SOCK_SEQPACKET:
4953	sp->type = SCTP_SOCKET_UDP;
4954	break;
4955	case SOCK_STREAM:
4956	sp->type = SCTP_SOCKET_TCP;
4957	break;
4958	default:
4959	return -ESOCKTNOSUPPORT;
4960	}
4961
4962	sk->sk_gso_type = SKB_GSO_SCTP;
4963
4964	/* Initialize default send parameters. These parameters can be
4965	* modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4966	*/
4967	sp->default_stream = 0;
4968	sp->default_ppid = 0;
4969	sp->default_flags = 0;
4970	sp->default_context = 0;
4971	sp->default_timetolive = 0;
4972
4973	sp->default_rcv_context = 0;
4974	sp->max_burst = net->sctp.max_burst;
4975
4976	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4977
4978	/* Initialize default setup parameters. These parameters
4979	* can be modified with the SCTP_INITMSG socket option or
4980	* overridden by the SCTP_INIT CMSG.
4981	*/
4982	sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4983	sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4984	sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4985	sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4986
4987	/* Initialize default RTO related parameters. These parameters can
4988	* be modified for with the SCTP_RTOINFO socket option.
4989	*/
4990	sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4991	sp->rtoinfo.srto_max = net->sctp.rto_max;
4992	sp->rtoinfo.srto_min = net->sctp.rto_min;
4993
4994	/* Initialize default association related parameters. These parameters
4995	* can be modified with the SCTP_ASSOCINFO socket option.
4996	*/
4997	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4998	sp->assocparams.sasoc_number_peer_destinations = 0;
4999	sp->assocparams.sasoc_peer_rwnd = 0;
5000	sp->assocparams.sasoc_local_rwnd = 0;
5001	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5002
5003	/* Initialize default event subscriptions. By default, all the
5004	* options are off.
5005	*/
5006	sp->subscribe = 0;
5007
5008	/* Default Peer Address Parameters. These defaults can
5009	* be modified via SCTP_PEER_ADDR_PARAMS
5010	*/
5011	sp->hbinterval = net->sctp.hb_interval;
5012	sp->udp_port = htons(net->sctp.udp_port);
5013	sp->encap_port = htons(net->sctp.encap_port);
5014	sp->pathmaxrxt = net->sctp.max_retrans_path;
5015	sp->pf_retrans = net->sctp.pf_retrans;
5016	sp->ps_retrans = net->sctp.ps_retrans;
5017	sp->pf_expose = net->sctp.pf_expose;
5018	sp->pathmtu = 0; /* allow default discovery */
5019	sp->sackdelay = net->sctp.sack_timeout;
5020	sp->sackfreq = 2;
5021	sp->param_flags = SPP_HB_ENABLE |
5022	SPP_PMTUD_ENABLE |
5023	SPP_SACKDELAY_ENABLE;
5024	sp->default_ss = SCTP_SS_DEFAULT;
5025
5026	/* If enabled no SCTP message fragmentation will be performed.
5027	* Configure through SCTP_DISABLE_FRAGMENTS socket option.
5028	*/
5029	sp->disable_fragments = 0;
5030
5031	/* Enable Nagle algorithm by default. */
5032	sp->nodelay = 0;
5033
5034	sp->recvrcvinfo = 0;
5035	sp->recvnxtinfo = 0;
5036
5037	/* Enable by default. */
5038	sp->v4mapped = 1;
5039
5040	/* Auto-close idle associations after the configured
5041	* number of seconds. A value of 0 disables this
5042	* feature. Configure through the SCTP_AUTOCLOSE socket option,
5043	* for UDP-style sockets only.
5044	*/
5045	sp->autoclose = 0;
5046
5047	/* User specified fragmentation limit. */
5048	sp->user_frag = 0;
5049
5050	sp->adaptation_ind = 0;
5051
5052	sp->pf = sctp_get_pf_specific(family: sk->sk_family);
5053
5054	/* Control variables for partial data delivery. */
5055	atomic_set(v: &sp->pd_mode, i: 0);
5056	skb_queue_head_init(list: &sp->pd_lobby);
5057	sp->frag_interleave = 0;
5058	sp->probe_interval = net->sctp.probe_interval;
5059
5060	/* Create a per socket endpoint structure. Even if we
5061	* change the data structure relationships, this may still
5062	* be useful for storing pre-connect address information.
5063	*/
5064	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5065	if (!sp->ep)
5066	return -ENOMEM;
5067
5068	sp->hmac = NULL;
5069
5070	sk->sk_destruct = sctp_destruct_sock;
5071
5072	SCTP_DBG_OBJCNT_INC(sock);
5073
5074	sk_sockets_allocated_inc(sk);
5075	sock_prot_inuse_add(net, prot: sk->sk_prot, val: 1);
5076
5077	return 0;
5078	}
5079
5080	/* Cleanup any SCTP per socket resources. Must be called with
5081	* sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5082	*/
5083	static void sctp_destroy_sock(struct sock *sk)
5084	{
5085	struct sctp_sock *sp;
5086
5087	pr_debug("%s: sk:%p\n", __func__, sk);
5088
5089	/* Release our hold on the endpoint. */
5090	sp = sctp_sk(sk);
5091	/* This could happen during socket init, thus we bail out
5092	* early, since the rest of the below is not setup either.
5093	*/
5094	if (sp->ep == NULL)
5095	return;
5096
5097	if (sp->do_auto_asconf) {
5098	sp->do_auto_asconf = 0;
5099	list_del(entry: &sp->auto_asconf_list);
5100	}
5101	sctp_endpoint_free(sp->ep);
5102	sk_sockets_allocated_dec(sk);
5103	sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: -1);
5104	}
5105
5106	/* Triggered when there are no references on the socket anymore */
5107	static void sctp_destruct_common(struct sock *sk)
5108	{
5109	struct sctp_sock *sp = sctp_sk(sk);
5110
5111	/* Free up the HMAC transform. */
5112	crypto_free_shash(tfm: sp->hmac);
5113	}
5114
5115	static void sctp_destruct_sock(struct sock *sk)
5116	{
5117	sctp_destruct_common(sk);
5118	inet_sock_destruct(sk);
5119	}
5120
5121	/* API 4.1.7 shutdown() - TCP Style Syntax
5122	* int shutdown(int socket, int how);
5123	*
5124	* sd - the socket descriptor of the association to be closed.
5125	* how - Specifies the type of shutdown. The values are
5126	* as follows:
5127	* SHUT_RD
5128	* Disables further receive operations. No SCTP
5129	* protocol action is taken.
5130	* SHUT_WR
5131	* Disables further send operations, and initiates
5132	* the SCTP shutdown sequence.
5133	* SHUT_RDWR
5134	* Disables further send and receive operations
5135	* and initiates the SCTP shutdown sequence.
5136	*/
5137	static void sctp_shutdown(struct sock *sk, int how)
5138	{
5139	struct net *net = sock_net(sk);
5140	struct sctp_endpoint *ep;
5141
5142	if (!sctp_style(sk, TCP))
5143	return;
5144
5145	ep = sctp_sk(sk)->ep;
5146	if (how & SEND_SHUTDOWN && !list_empty(head: &ep->asocs)) {
5147	struct sctp_association *asoc;
5148
5149	inet_sk_set_state(sk, state: SCTP_SS_CLOSING);
5150	asoc = list_entry(ep->asocs.next,
5151	struct sctp_association, asocs);
5152	sctp_primitive_SHUTDOWN(net, asoc, NULL);
5153	}
5154	}
5155
5156	int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5157	struct sctp_info *info)
5158	{
5159	struct sctp_transport *prim;
5160	struct list_head *pos;
5161	int mask;
5162
5163	memset(info, 0, sizeof(*info));
5164	if (!asoc) {
5165	struct sctp_sock *sp = sctp_sk(sk);
5166
5167	info->sctpi_s_autoclose = sp->autoclose;
5168	info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5169	info->sctpi_s_pd_point = sp->pd_point;
5170	info->sctpi_s_nodelay = sp->nodelay;
5171	info->sctpi_s_disable_fragments = sp->disable_fragments;
5172	info->sctpi_s_v4mapped = sp->v4mapped;
5173	info->sctpi_s_frag_interleave = sp->frag_interleave;
5174	info->sctpi_s_type = sp->type;
5175
5176	return 0;
5177	}
5178
5179	info->sctpi_tag = asoc->c.my_vtag;
5180	info->sctpi_state = asoc->state;
5181	info->sctpi_rwnd = asoc->a_rwnd;
5182	info->sctpi_unackdata = asoc->unack_data;
5183	info->sctpi_penddata = sctp_tsnmap_pending(map: &asoc->peer.tsn_map);
5184	info->sctpi_instrms = asoc->stream.incnt;
5185	info->sctpi_outstrms = asoc->stream.outcnt;
5186	list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5187	info->sctpi_inqueue++;
5188	list_for_each(pos, &asoc->outqueue.out_chunk_list)
5189	info->sctpi_outqueue++;
5190	info->sctpi_overall_error = asoc->overall_error_count;
5191	info->sctpi_max_burst = asoc->max_burst;
5192	info->sctpi_maxseg = asoc->frag_point;
5193	info->sctpi_peer_rwnd = asoc->peer.rwnd;
5194	info->sctpi_peer_tag = asoc->c.peer_vtag;
5195
5196	mask = asoc->peer.intl_capable << 1;
5197	mask = (mask | asoc->peer.ecn_capable) << 1;
5198	mask = (mask | asoc->peer.ipv4_address) << 1;
5199	mask = (mask | asoc->peer.ipv6_address) << 1;
5200	mask = (mask | asoc->peer.reconf_capable) << 1;
5201	mask = (mask | asoc->peer.asconf_capable) << 1;
5202	mask = (mask | asoc->peer.prsctp_capable) << 1;
5203	mask = (mask | asoc->peer.auth_capable);
5204	info->sctpi_peer_capable = mask;
5205	mask = asoc->peer.sack_needed << 1;
5206	mask = (mask | asoc->peer.sack_generation) << 1;
5207	mask = (mask | asoc->peer.zero_window_announced);
5208	info->sctpi_peer_sack = mask;
5209
5210	info->sctpi_isacks = asoc->stats.isacks;
5211	info->sctpi_osacks = asoc->stats.osacks;
5212	info->sctpi_opackets = asoc->stats.opackets;
5213	info->sctpi_ipackets = asoc->stats.ipackets;
5214	info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5215	info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5216	info->sctpi_idupchunks = asoc->stats.idupchunks;
5217	info->sctpi_gapcnt = asoc->stats.gapcnt;
5218	info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5219	info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5220	info->sctpi_oodchunks = asoc->stats.oodchunks;
5221	info->sctpi_iodchunks = asoc->stats.iodchunks;
5222	info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5223	info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5224
5225	prim = asoc->peer.primary_path;
5226	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5227	info->sctpi_p_state = prim->state;
5228	info->sctpi_p_cwnd = prim->cwnd;
5229	info->sctpi_p_srtt = prim->srtt;
5230	info->sctpi_p_rto = jiffies_to_msecs(j: prim->rto);
5231	info->sctpi_p_hbinterval = prim->hbinterval;
5232	info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5233	info->sctpi_p_sackdelay = jiffies_to_msecs(j: prim->sackdelay);
5234	info->sctpi_p_ssthresh = prim->ssthresh;
5235	info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5236	info->sctpi_p_flight_size = prim->flight_size;
5237	info->sctpi_p_error = prim->error_count;
5238
5239	return 0;
5240	}
5241	EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5242
5243	/* use callback to avoid exporting the core structure */
5244	void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5245	{
5246	rhltable_walk_enter(hlt: &sctp_transport_hashtable, iter);
5247
5248	rhashtable_walk_start(iter);
5249	}
5250
5251	void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5252	{
5253	rhashtable_walk_stop(iter);
5254	rhashtable_walk_exit(iter);
5255	}
5256
5257	struct sctp_transport *sctp_transport_get_next(struct net *net,
5258	struct rhashtable_iter *iter)
5259	{
5260	struct sctp_transport *t;
5261
5262	t = rhashtable_walk_next(iter);
5263	for (; t; t = rhashtable_walk_next(iter)) {
5264	if (IS_ERR(ptr: t)) {
5265	if (PTR_ERR(ptr: t) == -EAGAIN)
5266	continue;
5267	break;
5268	}
5269
5270	if (!sctp_transport_hold(t))
5271	continue;
5272
5273	if (net_eq(net1: t->asoc->base.net, net2: net) &&
5274	t->asoc->peer.primary_path == t)
5275	break;
5276
5277	sctp_transport_put(t);
5278	}
5279
5280	return t;
5281	}
5282
5283	struct sctp_transport *sctp_transport_get_idx(struct net *net,
5284	struct rhashtable_iter *iter,
5285	int pos)
5286	{
5287	struct sctp_transport *t;
5288
5289	if (!pos)
5290	return SEQ_START_TOKEN;
5291
5292	while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(ptr: t)) {
5293	if (!--pos)
5294	break;
5295	sctp_transport_put(t);
5296	}
5297
5298	return t;
5299	}
5300
5301	int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5302	void *p) {
5303	int err = 0;
5304	int hash = 0;
5305	struct sctp_endpoint *ep;
5306	struct sctp_hashbucket *head;
5307
5308	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5309	hash++, head++) {
5310	read_lock_bh(&head->lock);
5311	sctp_for_each_hentry(ep, &head->chain) {
5312	err = cb(ep, p);
5313	if (err)
5314	break;
5315	}
5316	read_unlock_bh(&head->lock);
5317	}
5318
5319	return err;
5320	}
5321	EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5322
5323	int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
5324	const union sctp_addr *laddr,
5325	const union sctp_addr *paddr, void *p, int dif)
5326	{
5327	struct sctp_transport *transport;
5328	struct sctp_endpoint *ep;
5329	int err = -ENOENT;
5330
5331	rcu_read_lock();
5332	transport = sctp_addrs_lookup_transport(net, laddr, paddr, dif, sdif: dif);
5333	if (!transport) {
5334	rcu_read_unlock();
5335	return err;
5336	}
5337	ep = transport->asoc->ep;
5338	if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5339	sctp_transport_put(transport);
5340	rcu_read_unlock();
5341	return err;
5342	}
5343	rcu_read_unlock();
5344
5345	err = cb(ep, transport, p);
5346	sctp_endpoint_put(ep);
5347	sctp_transport_put(transport);
5348	return err;
5349	}
5350	EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5351
5352	int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
5353	struct net *net, int *pos, void *p)
5354	{
5355	struct rhashtable_iter hti;
5356	struct sctp_transport *tsp;
5357	struct sctp_endpoint *ep;
5358	int ret;
5359
5360	again:
5361	ret = 0;
5362	sctp_transport_walk_start(iter: &hti);
5363
5364	tsp = sctp_transport_get_idx(net, iter: &hti, pos: *pos + 1);
5365	for (; !IS_ERR_OR_NULL(ptr: tsp); tsp = sctp_transport_get_next(net, iter: &hti)) {
5366	ep = tsp->asoc->ep;
5367	if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5368	ret = cb(ep, tsp, p);
5369	if (ret)
5370	break;
5371	sctp_endpoint_put(ep);
5372	}
5373	(*pos)++;
5374	sctp_transport_put(tsp);
5375	}
5376	sctp_transport_walk_stop(iter: &hti);
5377
5378	if (ret) {
5379	if (cb_done && !cb_done(ep, tsp, p)) {
5380	(*pos)++;
5381	sctp_endpoint_put(ep);
5382	sctp_transport_put(tsp);
5383	goto again;
5384	}
5385	sctp_endpoint_put(ep);
5386	sctp_transport_put(tsp);
5387	}
5388
5389	return ret;
5390	}
5391	EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
5392
5393	/* 7.2.1 Association Status (SCTP_STATUS)
5394
5395	* Applications can retrieve current status information about an
5396	* association, including association state, peer receiver window size,
5397	* number of unacked data chunks, and number of data chunks pending
5398	* receipt. This information is read-only.
5399	*/
5400	static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5401	char __user *optval,
5402	int __user *optlen)
5403	{
5404	struct sctp_status status;
5405	struct sctp_association *asoc = NULL;
5406	struct sctp_transport *transport;
5407	sctp_assoc_t associd;
5408	int retval = 0;
5409
5410	if (len < sizeof(status)) {
5411	retval = -EINVAL;
5412	goto out;
5413	}
5414
5415	len = sizeof(status);
5416	if (copy_from_user(to: &status, from: optval, n: len)) {
5417	retval = -EFAULT;
5418	goto out;
5419	}
5420
5421	associd = status.sstat_assoc_id;
5422	asoc = sctp_id2assoc(sk, id: associd);
5423	if (!asoc) {
5424	retval = -EINVAL;
5425	goto out;
5426	}
5427
5428	transport = asoc->peer.primary_path;
5429
5430	status.sstat_assoc_id = sctp_assoc2id(asoc);
5431	status.sstat_state = sctp_assoc_to_state(asoc);
5432	status.sstat_rwnd = asoc->peer.rwnd;
5433	status.sstat_unackdata = asoc->unack_data;
5434
5435	status.sstat_penddata = sctp_tsnmap_pending(map: &asoc->peer.tsn_map);
5436	status.sstat_instrms = asoc->stream.incnt;
5437	status.sstat_outstrms = asoc->stream.outcnt;
5438	status.sstat_fragmentation_point = asoc->frag_point;
5439	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(asoc: transport->asoc);
5440	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5441	transport->af_specific->sockaddr_len);
5442	/* Map ipv4 address into v4-mapped-on-v6 address. */
5443	sctp_get_pf_specific(family: sk->sk_family)->addr_to_user(sctp_sk(sk),
5444	(union sctp_addr *)&status.sstat_primary.spinfo_address);
5445	status.sstat_primary.spinfo_state = transport->state;
5446	status.sstat_primary.spinfo_cwnd = transport->cwnd;
5447	status.sstat_primary.spinfo_srtt = transport->srtt;
5448	status.sstat_primary.spinfo_rto = jiffies_to_msecs(j: transport->rto);
5449	status.sstat_primary.spinfo_mtu = transport->pathmtu;
5450
5451	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5452	status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5453
5454	if (put_user(len, optlen)) {
5455	retval = -EFAULT;
5456	goto out;
5457	}
5458
5459	pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5460	__func__, len, status.sstat_state, status.sstat_rwnd,
5461	status.sstat_assoc_id);
5462
5463	if (copy_to_user(to: optval, from: &status, n: len)) {
5464	retval = -EFAULT;
5465	goto out;
5466	}
5467
5468	out:
5469	return retval;
5470	}
5471
5472
5473	/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5474	*
5475	* Applications can retrieve information about a specific peer address
5476	* of an association, including its reachability state, congestion
5477	* window, and retransmission timer values. This information is
5478	* read-only.
5479	*/
5480	static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5481	char __user *optval,
5482	int __user *optlen)
5483	{
5484	struct sctp_paddrinfo pinfo;
5485	struct sctp_transport *transport;
5486	int retval = 0;
5487
5488	if (len < sizeof(pinfo)) {
5489	retval = -EINVAL;
5490	goto out;
5491	}
5492
5493	len = sizeof(pinfo);
5494	if (copy_from_user(to: &pinfo, from: optval, n: len)) {
5495	retval = -EFAULT;
5496	goto out;
5497	}
5498
5499	transport = sctp_addr_id2transport(sk, addr: &pinfo.spinfo_address,
5500	id: pinfo.spinfo_assoc_id);
5501	if (!transport) {
5502	retval = -EINVAL;
5503	goto out;
5504	}
5505
5506	if (transport->state == SCTP_PF &&
5507	transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5508	retval = -EACCES;
5509	goto out;
5510	}
5511
5512	pinfo.spinfo_assoc_id = sctp_assoc2id(asoc: transport->asoc);
5513	pinfo.spinfo_state = transport->state;
5514	pinfo.spinfo_cwnd = transport->cwnd;
5515	pinfo.spinfo_srtt = transport->srtt;
5516	pinfo.spinfo_rto = jiffies_to_msecs(j: transport->rto);
5517	pinfo.spinfo_mtu = transport->pathmtu;
5518
5519	if (pinfo.spinfo_state == SCTP_UNKNOWN)
5520	pinfo.spinfo_state = SCTP_ACTIVE;
5521
5522	if (put_user(len, optlen)) {
5523	retval = -EFAULT;
5524	goto out;
5525	}
5526
5527	if (copy_to_user(to: optval, from: &pinfo, n: len)) {
5528	retval = -EFAULT;
5529	goto out;
5530	}
5531
5532	out:
5533	return retval;
5534	}
5535
5536	/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5537	*
5538	* This option is a on/off flag. If enabled no SCTP message
5539	* fragmentation will be performed. Instead if a message being sent
5540	* exceeds the current PMTU size, the message will NOT be sent and
5541	* instead a error will be indicated to the user.
5542	*/
5543	static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5544	char __user *optval, int __user *optlen)
5545	{
5546	int val;
5547
5548	if (len < sizeof(int))
5549	return -EINVAL;
5550
5551	len = sizeof(int);
5552	val = (sctp_sk(sk)->disable_fragments == 1);
5553	if (put_user(len, optlen))
5554	return -EFAULT;
5555	if (copy_to_user(to: optval, from: &val, n: len))
5556	return -EFAULT;
5557	return 0;
5558	}
5559
5560	/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5561	*
5562	* This socket option is used to specify various notifications and
5563	* ancillary data the user wishes to receive.
5564	*/
5565	static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5566	int __user *optlen)
5567	{
5568	struct sctp_event_subscribe subscribe;
5569	__u8 *sn_type = (__u8 *)&subscribe;
5570	int i;
5571
5572	if (len == 0)
5573	return -EINVAL;
5574	if (len > sizeof(struct sctp_event_subscribe))
5575	len = sizeof(struct sctp_event_subscribe);
5576	if (put_user(len, optlen))
5577	return -EFAULT;
5578
5579	for (i = 0; i < len; i++)
5580	sn_type[i] = sctp_ulpevent_type_enabled(subscribe: sctp_sk(sk)->subscribe,
5581	sn_type: SCTP_SN_TYPE_BASE + i);
5582
5583	if (copy_to_user(to: optval, from: &subscribe, n: len))
5584	return -EFAULT;
5585
5586	return 0;
5587	}
5588
5589	/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5590	*
5591	* This socket option is applicable to the UDP-style socket only. When
5592	* set it will cause associations that are idle for more than the
5593	* specified number of seconds to automatically close. An association
5594	* being idle is defined an association that has NOT sent or received
5595	* user data. The special value of '0' indicates that no automatic
5596	* close of any associations should be performed. The option expects an
5597	* integer defining the number of seconds of idle time before an
5598	* association is closed.
5599	*/
5600	static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5601	{
5602	/* Applicable to UDP-style socket only */
5603	if (sctp_style(sk, TCP))
5604	return -EOPNOTSUPP;
5605	if (len < sizeof(int))
5606	return -EINVAL;
5607	len = sizeof(int);
5608	if (put_user(len, optlen))
5609	return -EFAULT;
5610	if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5611	return -EFAULT;
5612	return 0;
5613	}
5614
5615	/* Helper routine to branch off an association to a new socket. */
5616	int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5617	{
5618	struct sctp_association *asoc = sctp_id2assoc(sk, id);
5619	struct sctp_sock *sp = sctp_sk(sk);
5620	struct socket *sock;
5621	int err = 0;
5622
5623	/* Do not peel off from one netns to another one. */
5624	if (!net_eq(current->nsproxy->net_ns, net2: sock_net(sk)))
5625	return -EINVAL;
5626
5627	if (!asoc)
5628	return -EINVAL;
5629
5630	/* An association cannot be branched off from an already peeled-off
5631	* socket, nor is this supported for tcp style sockets.
5632	*/
5633	if (!sctp_style(sk, UDP))
5634	return -EINVAL;
5635
5636	/* Create a new socket. */
5637	err = sock_create(family: sk->sk_family, type: SOCK_SEQPACKET, IPPROTO_SCTP, res: &sock);
5638	if (err < 0)
5639	return err;
5640
5641	sctp_copy_sock(newsk: sock->sk, sk, asoc);
5642
5643	/* Make peeled-off sockets more like 1-1 accepted sockets.
5644	* Set the daddr and initialize id to something more random and also
5645	* copy over any ip options.
5646	*/
5647	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sock->sk);
5648	sp->pf->copy_ip_options(sk, sock->sk);
5649
5650	/* Populate the fields of the newsk from the oldsk and migrate the
5651	* asoc to the newsk.
5652	*/
5653	err = sctp_sock_migrate(oldsk: sk, newsk: sock->sk, assoc: asoc,
5654	type: SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5655	if (err) {
5656	sock_release(sock);
5657	sock = NULL;
5658	}
5659
5660	*sockp = sock;
5661
5662	return err;
5663	}
5664	EXPORT_SYMBOL(sctp_do_peeloff);
5665
5666	static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5667	struct file **newfile, unsigned flags)
5668	{
5669	struct socket *newsock;
5670	int retval;
5671
5672	retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5673	if (retval < 0)
5674	goto out;
5675
5676	/* Map the socket to an unused fd that can be returned to the user. */
5677	retval = get_unused_fd_flags(flags: flags & SOCK_CLOEXEC);
5678	if (retval < 0) {
5679	sock_release(sock: newsock);
5680	goto out;
5681	}
5682
5683	*newfile = sock_alloc_file(sock: newsock, flags: 0, NULL);
5684	if (IS_ERR(ptr: *newfile)) {
5685	put_unused_fd(fd: retval);
5686	retval = PTR_ERR(ptr: *newfile);
5687	*newfile = NULL;
5688	return retval;
5689	}
5690
5691	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5692	retval);
5693
5694	peeloff->sd = retval;
5695
5696	if (flags & SOCK_NONBLOCK)
5697	(*newfile)->f_flags |= O_NONBLOCK;
5698	out:
5699	return retval;
5700	}
5701
5702	static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5703	{
5704	sctp_peeloff_arg_t peeloff;
5705	struct file *newfile = NULL;
5706	int retval = 0;
5707
5708	if (len < sizeof(sctp_peeloff_arg_t))
5709	return -EINVAL;
5710	len = sizeof(sctp_peeloff_arg_t);
5711	if (copy_from_user(to: &peeloff, from: optval, n: len))
5712	return -EFAULT;
5713
5714	retval = sctp_getsockopt_peeloff_common(sk, peeloff: &peeloff, newfile: &newfile, flags: 0);
5715	if (retval < 0)
5716	goto out;
5717
5718	/* Return the fd mapped to the new socket. */
5719	if (put_user(len, optlen)) {
5720	fput(newfile);
5721	put_unused_fd(fd: retval);
5722	return -EFAULT;
5723	}
5724
5725	if (copy_to_user(to: optval, from: &peeloff, n: len)) {
5726	fput(newfile);
5727	put_unused_fd(fd: retval);
5728	return -EFAULT;
5729	}
5730	fd_install(fd: retval, file: newfile);
5731	out:
5732	return retval;
5733	}
5734
5735	static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5736	char __user *optval, int __user *optlen)
5737	{
5738	sctp_peeloff_flags_arg_t peeloff;
5739	struct file *newfile = NULL;
5740	int retval = 0;
5741
5742	if (len < sizeof(sctp_peeloff_flags_arg_t))
5743	return -EINVAL;
5744	len = sizeof(sctp_peeloff_flags_arg_t);
5745	if (copy_from_user(to: &peeloff, from: optval, n: len))
5746	return -EFAULT;
5747
5748	retval = sctp_getsockopt_peeloff_common(sk, peeloff: &peeloff.p_arg,
5749	newfile: &newfile, flags: peeloff.flags);
5750	if (retval < 0)
5751	goto out;
5752
5753	/* Return the fd mapped to the new socket. */
5754	if (put_user(len, optlen)) {
5755	fput(newfile);
5756	put_unused_fd(fd: retval);
5757	return -EFAULT;
5758	}
5759
5760	if (copy_to_user(to: optval, from: &peeloff, n: len)) {
5761	fput(newfile);
5762	put_unused_fd(fd: retval);
5763	return -EFAULT;
5764	}
5765	fd_install(fd: retval, file: newfile);
5766	out:
5767	return retval;
5768	}
5769
5770	/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5771	*
5772	* Applications can enable or disable heartbeats for any peer address of
5773	* an association, modify an address's heartbeat interval, force a
5774	* heartbeat to be sent immediately, and adjust the address's maximum
5775	* number of retransmissions sent before an address is considered
5776	* unreachable. The following structure is used to access and modify an
5777	* address's parameters:
5778	*
5779	* struct sctp_paddrparams {
5780	* sctp_assoc_t spp_assoc_id;
5781	* struct sockaddr_storage spp_address;
5782	* uint32_t spp_hbinterval;
5783	* uint16_t spp_pathmaxrxt;
5784	* uint32_t spp_pathmtu;
5785	* uint32_t spp_sackdelay;
5786	* uint32_t spp_flags;
5787	* };
5788	*
5789	* spp_assoc_id - (one-to-many style socket) This is filled in the
5790	* application, and identifies the association for
5791	* this query.
5792	* spp_address - This specifies which address is of interest.
5793	* spp_hbinterval - This contains the value of the heartbeat interval,
5794	* in milliseconds. If a value of zero
5795	* is present in this field then no changes are to
5796	* be made to this parameter.
5797	* spp_pathmaxrxt - This contains the maximum number of
5798	* retransmissions before this address shall be
5799	* considered unreachable. If a value of zero
5800	* is present in this field then no changes are to
5801	* be made to this parameter.
5802	* spp_pathmtu - When Path MTU discovery is disabled the value
5803	* specified here will be the "fixed" path mtu.
5804	* Note that if the spp_address field is empty
5805	* then all associations on this address will
5806	* have this fixed path mtu set upon them.
5807	*
5808	* spp_sackdelay - When delayed sack is enabled, this value specifies
5809	* the number of milliseconds that sacks will be delayed
5810	* for. This value will apply to all addresses of an
5811	* association if the spp_address field is empty. Note
5812	* also, that if delayed sack is enabled and this
5813	* value is set to 0, no change is made to the last
5814	* recorded delayed sack timer value.
5815	*
5816	* spp_flags - These flags are used to control various features
5817	* on an association. The flag field may contain
5818	* zero or more of the following options.
5819	*
5820	* SPP_HB_ENABLE - Enable heartbeats on the
5821	* specified address. Note that if the address
5822	* field is empty all addresses for the association
5823	* have heartbeats enabled upon them.
5824	*
5825	* SPP_HB_DISABLE - Disable heartbeats on the
5826	* speicifed address. Note that if the address
5827	* field is empty all addresses for the association
5828	* will have their heartbeats disabled. Note also
5829	* that SPP_HB_ENABLE and SPP_HB_DISABLE are
5830	* mutually exclusive, only one of these two should
5831	* be specified. Enabling both fields will have
5832	* undetermined results.
5833	*
5834	* SPP_HB_DEMAND - Request a user initiated heartbeat
5835	* to be made immediately.
5836	*
5837	* SPP_PMTUD_ENABLE - This field will enable PMTU
5838	* discovery upon the specified address. Note that
5839	* if the address feild is empty then all addresses
5840	* on the association are effected.
5841	*
5842	* SPP_PMTUD_DISABLE - This field will disable PMTU
5843	* discovery upon the specified address. Note that
5844	* if the address feild is empty then all addresses
5845	* on the association are effected. Not also that
5846	* SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5847	* exclusive. Enabling both will have undetermined
5848	* results.
5849	*
5850	* SPP_SACKDELAY_ENABLE - Setting this flag turns
5851	* on delayed sack. The time specified in spp_sackdelay
5852	* is used to specify the sack delay for this address. Note
5853	* that if spp_address is empty then all addresses will
5854	* enable delayed sack and take on the sack delay
5855	* value specified in spp_sackdelay.
5856	* SPP_SACKDELAY_DISABLE - Setting this flag turns
5857	* off delayed sack. If the spp_address field is blank then
5858	* delayed sack is disabled for the entire association. Note
5859	* also that this field is mutually exclusive to
5860	* SPP_SACKDELAY_ENABLE, setting both will have undefined
5861	* results.
5862	*
5863	* SPP_IPV6_FLOWLABEL: Setting this flag enables the
5864	* setting of the IPV6 flow label value. The value is
5865	* contained in the spp_ipv6_flowlabel field.
5866	* Upon retrieval, this flag will be set to indicate that
5867	* the spp_ipv6_flowlabel field has a valid value returned.
5868	* If a specific destination address is set (in the
5869	* spp_address field), then the value returned is that of
5870	* the address. If just an association is specified (and
5871	* no address), then the association's default flow label
5872	* is returned. If neither an association nor a destination
5873	* is specified, then the socket's default flow label is
5874	* returned. For non-IPv6 sockets, this flag will be left
5875	* cleared.
5876	*
5877	* SPP_DSCP: Setting this flag enables the setting of the
5878	* Differentiated Services Code Point (DSCP) value
5879	* associated with either the association or a specific
5880	* address. The value is obtained in the spp_dscp field.
5881	* Upon retrieval, this flag will be set to indicate that
5882	* the spp_dscp field has a valid value returned. If a
5883	* specific destination address is set when called (in the
5884	* spp_address field), then that specific destination
5885	* address's DSCP value is returned. If just an association
5886	* is specified, then the association's default DSCP is
5887	* returned. If neither an association nor a destination is
5888	* specified, then the socket's default DSCP is returned.
5889	*
5890	* spp_ipv6_flowlabel
5891	* - This field is used in conjunction with the
5892	* SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5893	* The 20 least significant bits are used for the flow
5894	* label. This setting has precedence over any IPv6-layer
5895	* setting.
5896	*
5897	* spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5898	* and contains the DSCP. The 6 most significant bits are
5899	* used for the DSCP. This setting has precedence over any
5900	* IPv4- or IPv6- layer setting.
5901	*/
5902	static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5903	char __user *optval, int __user *optlen)
5904	{
5905	struct sctp_paddrparams params;
5906	struct sctp_transport *trans = NULL;
5907	struct sctp_association *asoc = NULL;
5908	struct sctp_sock *sp = sctp_sk(sk);
5909
5910	if (len >= sizeof(params))
5911	len = sizeof(params);
5912	else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5913	spp_ipv6_flowlabel), 4))
5914	len = ALIGN(offsetof(struct sctp_paddrparams,
5915	spp_ipv6_flowlabel), 4);
5916	else
5917	return -EINVAL;
5918
5919	if (copy_from_user(to: &params, from: optval, n: len))
5920	return -EFAULT;
5921
5922	/* If an address other than INADDR_ANY is specified, and
5923	* no transport is found, then the request is invalid.
5924	*/
5925	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params.spp_address)) {
5926	trans = sctp_addr_id2transport(sk, addr: &params.spp_address,
5927	id: params.spp_assoc_id);
5928	if (!trans) {
5929	pr_debug("%s: failed no transport\n", __func__);
5930	return -EINVAL;
5931	}
5932	}
5933
5934	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5935	* socket is a one to many style socket, and an association
5936	* was not found, then the id was invalid.
5937	*/
5938	asoc = sctp_id2assoc(sk, id: params.spp_assoc_id);
5939	if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5940	sctp_style(sk, UDP)) {
5941	pr_debug("%s: failed no association\n", __func__);
5942	return -EINVAL;
5943	}
5944
5945	if (trans) {
5946	/* Fetch transport values. */
5947	params.spp_hbinterval = jiffies_to_msecs(j: trans->hbinterval);
5948	params.spp_pathmtu = trans->pathmtu;
5949	params.spp_pathmaxrxt = trans->pathmaxrxt;
5950	params.spp_sackdelay = jiffies_to_msecs(j: trans->sackdelay);
5951
5952	/*draft-11 doesn't say what to return in spp_flags*/
5953	params.spp_flags = trans->param_flags;
5954	if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5955	params.spp_ipv6_flowlabel = trans->flowlabel &
5956	SCTP_FLOWLABEL_VAL_MASK;
5957	params.spp_flags |= SPP_IPV6_FLOWLABEL;
5958	}
5959	if (trans->dscp & SCTP_DSCP_SET_MASK) {
5960	params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5961	params.spp_flags |= SPP_DSCP;
5962	}
5963	} else if (asoc) {
5964	/* Fetch association values. */
5965	params.spp_hbinterval = jiffies_to_msecs(j: asoc->hbinterval);
5966	params.spp_pathmtu = asoc->pathmtu;
5967	params.spp_pathmaxrxt = asoc->pathmaxrxt;
5968	params.spp_sackdelay = jiffies_to_msecs(j: asoc->sackdelay);
5969
5970	/*draft-11 doesn't say what to return in spp_flags*/
5971	params.spp_flags = asoc->param_flags;
5972	if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5973	params.spp_ipv6_flowlabel = asoc->flowlabel &
5974	SCTP_FLOWLABEL_VAL_MASK;
5975	params.spp_flags |= SPP_IPV6_FLOWLABEL;
5976	}
5977	if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5978	params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5979	params.spp_flags |= SPP_DSCP;
5980	}
5981	} else {
5982	/* Fetch socket values. */
5983	params.spp_hbinterval = sp->hbinterval;
5984	params.spp_pathmtu = sp->pathmtu;
5985	params.spp_sackdelay = sp->sackdelay;
5986	params.spp_pathmaxrxt = sp->pathmaxrxt;
5987
5988	/*draft-11 doesn't say what to return in spp_flags*/
5989	params.spp_flags = sp->param_flags;
5990	if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5991	params.spp_ipv6_flowlabel = sp->flowlabel &
5992	SCTP_FLOWLABEL_VAL_MASK;
5993	params.spp_flags |= SPP_IPV6_FLOWLABEL;
5994	}
5995	if (sp->dscp & SCTP_DSCP_SET_MASK) {
5996	params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5997	params.spp_flags |= SPP_DSCP;
5998	}
5999	}
6000
6001	if (copy_to_user(to: optval, from: &params, n: len))
6002	return -EFAULT;
6003
6004	if (put_user(len, optlen))
6005	return -EFAULT;
6006
6007	return 0;
6008	}
6009
6010	/*
6011	* 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6012	*
6013	* This option will effect the way delayed acks are performed. This
6014	* option allows you to get or set the delayed ack time, in
6015	* milliseconds. It also allows changing the delayed ack frequency.
6016	* Changing the frequency to 1 disables the delayed sack algorithm. If
6017	* the assoc_id is 0, then this sets or gets the endpoints default
6018	* values. If the assoc_id field is non-zero, then the set or get
6019	* effects the specified association for the one to many model (the
6020	* assoc_id field is ignored by the one to one model). Note that if
6021	* sack_delay or sack_freq are 0 when setting this option, then the
6022	* current values will remain unchanged.
6023	*
6024	* struct sctp_sack_info {
6025	* sctp_assoc_t sack_assoc_id;
6026	* uint32_t sack_delay;
6027	* uint32_t sack_freq;
6028	* };
6029	*
6030	* sack_assoc_id - This parameter, indicates which association the user
6031	* is performing an action upon. Note that if this field's value is
6032	* zero then the endpoints default value is changed (effecting future
6033	* associations only).
6034	*
6035	* sack_delay - This parameter contains the number of milliseconds that
6036	* the user is requesting the delayed ACK timer be set to. Note that
6037	* this value is defined in the standard to be between 200 and 500
6038	* milliseconds.
6039	*
6040	* sack_freq - This parameter contains the number of packets that must
6041	* be received before a sack is sent without waiting for the delay
6042	* timer to expire. The default value for this is 2, setting this
6043	* value to 1 will disable the delayed sack algorithm.
6044	*/
6045	static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6046	char __user *optval,
6047	int __user *optlen)
6048	{
6049	struct sctp_sack_info params;
6050	struct sctp_association *asoc = NULL;
6051	struct sctp_sock *sp = sctp_sk(sk);
6052
6053	if (len >= sizeof(struct sctp_sack_info)) {
6054	len = sizeof(struct sctp_sack_info);
6055
6056	if (copy_from_user(to: &params, from: optval, n: len))
6057	return -EFAULT;
6058	} else if (len == sizeof(struct sctp_assoc_value)) {
6059	pr_warn_ratelimited(DEPRECATED
6060	"%s (pid %d) "
6061	"Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6062	"Use struct sctp_sack_info instead\n",
6063	current->comm, task_pid_nr(current));
6064	if (copy_from_user(to: &params, from: optval, n: len))
6065	return -EFAULT;
6066	} else
6067	return -EINVAL;
6068
6069	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6070	* socket is a one to many style socket, and an association
6071	* was not found, then the id was invalid.
6072	*/
6073	asoc = sctp_id2assoc(sk, id: params.sack_assoc_id);
6074	if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6075	sctp_style(sk, UDP))
6076	return -EINVAL;
6077
6078	if (asoc) {
6079	/* Fetch association values. */
6080	if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6081	params.sack_delay = jiffies_to_msecs(j: asoc->sackdelay);
6082	params.sack_freq = asoc->sackfreq;
6083
6084	} else {
6085	params.sack_delay = 0;
6086	params.sack_freq = 1;
6087	}
6088	} else {
6089	/* Fetch socket values. */
6090	if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6091	params.sack_delay = sp->sackdelay;
6092	params.sack_freq = sp->sackfreq;
6093	} else {
6094	params.sack_delay = 0;
6095	params.sack_freq = 1;
6096	}
6097	}
6098
6099	if (copy_to_user(to: optval, from: &params, n: len))
6100	return -EFAULT;
6101
6102	if (put_user(len, optlen))
6103	return -EFAULT;
6104
6105	return 0;
6106	}
6107
6108	/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6109	*
6110	* Applications can specify protocol parameters for the default association
6111	* initialization. The option name argument to setsockopt() and getsockopt()
6112	* is SCTP_INITMSG.
6113	*
6114	* Setting initialization parameters is effective only on an unconnected
6115	* socket (for UDP-style sockets only future associations are effected
6116	* by the change). With TCP-style sockets, this option is inherited by
6117	* sockets derived from a listener socket.
6118	*/
6119	static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6120	{
6121	if (len < sizeof(struct sctp_initmsg))
6122	return -EINVAL;
6123	len = sizeof(struct sctp_initmsg);
6124	if (put_user(len, optlen))
6125	return -EFAULT;
6126	if (copy_to_user(to: optval, from: &sctp_sk(sk)->initmsg, n: len))
6127	return -EFAULT;
6128	return 0;
6129	}
6130
6131
6132	static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6133	char __user *optval, int __user *optlen)
6134	{
6135	struct sctp_association *asoc;
6136	int cnt = 0;
6137	struct sctp_getaddrs getaddrs;
6138	struct sctp_transport *from;
6139	void __user *to;
6140	union sctp_addr temp;
6141	struct sctp_sock *sp = sctp_sk(sk);
6142	int addrlen;
6143	size_t space_left;
6144	int bytes_copied;
6145
6146	if (len < sizeof(struct sctp_getaddrs))
6147	return -EINVAL;
6148
6149	if (copy_from_user(to: &getaddrs, from: optval, n: sizeof(struct sctp_getaddrs)))
6150	return -EFAULT;
6151
6152	/* For UDP-style sockets, id specifies the association to query. */
6153	asoc = sctp_id2assoc(sk, id: getaddrs.assoc_id);
6154	if (!asoc)
6155	return -EINVAL;
6156
6157	to = optval + offsetof(struct sctp_getaddrs, addrs);
6158	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6159
6160	list_for_each_entry(from, &asoc->peer.transport_addr_list,
6161	transports) {
6162	memcpy(&temp, &from->ipaddr, sizeof(temp));
6163	addrlen = sctp_get_pf_specific(family: sk->sk_family)
6164	->addr_to_user(sp, &temp);
6165	if (space_left < addrlen)
6166	return -ENOMEM;
6167	if (copy_to_user(to, from: &temp, n: addrlen))
6168	return -EFAULT;
6169	to += addrlen;
6170	cnt++;
6171	space_left -= addrlen;
6172	}
6173
6174	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6175	return -EFAULT;
6176	bytes_copied = ((char __user *)to) - optval;
6177	if (put_user(bytes_copied, optlen))
6178	return -EFAULT;
6179
6180	return 0;
6181	}
6182
6183	static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6184	size_t space_left, int *bytes_copied)
6185	{
6186	struct sctp_sockaddr_entry *addr;
6187	union sctp_addr temp;
6188	int cnt = 0;
6189	int addrlen;
6190	struct net *net = sock_net(sk);
6191
6192	rcu_read_lock();
6193	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6194	if (!addr->valid)
6195	continue;
6196
6197	if ((PF_INET == sk->sk_family) &&
6198	(AF_INET6 == addr->a.sa.sa_family))
6199	continue;
6200	if ((PF_INET6 == sk->sk_family) &&
6201	inet_v6_ipv6only(sk) &&
6202	(AF_INET == addr->a.sa.sa_family))
6203	continue;
6204	memcpy(&temp, &addr->a, sizeof(temp));
6205	if (!temp.v4.sin_port)
6206	temp.v4.sin_port = htons(port);
6207
6208	addrlen = sctp_get_pf_specific(family: sk->sk_family)
6209	->addr_to_user(sctp_sk(sk), &temp);
6210
6211	if (space_left < addrlen) {
6212	cnt = -ENOMEM;
6213	break;
6214	}
6215	memcpy(to, &temp, addrlen);
6216
6217	to += addrlen;
6218	cnt++;
6219	space_left -= addrlen;
6220	*bytes_copied += addrlen;
6221	}
6222	rcu_read_unlock();
6223
6224	return cnt;
6225	}
6226
6227
6228	static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6229	char __user *optval, int __user *optlen)
6230	{
6231	struct sctp_bind_addr *bp;
6232	struct sctp_association *asoc;
6233	int cnt = 0;
6234	struct sctp_getaddrs getaddrs;
6235	struct sctp_sockaddr_entry *addr;
6236	void __user *to;
6237	union sctp_addr temp;
6238	struct sctp_sock *sp = sctp_sk(sk);
6239	int addrlen;
6240	int err = 0;
6241	size_t space_left;
6242	int bytes_copied = 0;
6243	void *addrs;
6244	void *buf;
6245
6246	if (len < sizeof(struct sctp_getaddrs))
6247	return -EINVAL;
6248
6249	if (copy_from_user(to: &getaddrs, from: optval, n: sizeof(struct sctp_getaddrs)))
6250	return -EFAULT;
6251
6252	/*
6253	* For UDP-style sockets, id specifies the association to query.
6254	* If the id field is set to the value '0' then the locally bound
6255	* addresses are returned without regard to any particular
6256	* association.
6257	*/
6258	if (0 == getaddrs.assoc_id) {
6259	bp = &sctp_sk(sk)->ep->base.bind_addr;
6260	} else {
6261	asoc = sctp_id2assoc(sk, id: getaddrs.assoc_id);
6262	if (!asoc)
6263	return -EINVAL;
6264	bp = &asoc->base.bind_addr;
6265	}
6266
6267	to = optval + offsetof(struct sctp_getaddrs, addrs);
6268	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6269
6270	addrs = kmalloc(size: space_left, GFP_USER | __GFP_NOWARN);
6271	if (!addrs)
6272	return -ENOMEM;
6273
6274	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6275	* addresses from the global local address list.
6276	*/
6277	if (sctp_list_single_entry(head: &bp->address_list)) {
6278	addr = list_entry(bp->address_list.next,
6279	struct sctp_sockaddr_entry, list);
6280	if (sctp_is_any(sk, addr: &addr->a)) {
6281	cnt = sctp_copy_laddrs(sk, port: bp->port, to: addrs,
6282	space_left, bytes_copied: &bytes_copied);
6283	if (cnt < 0) {
6284	err = cnt;
6285	goto out;
6286	}
6287	goto copy_getaddrs;
6288	}
6289	}
6290
6291	buf = addrs;
6292	/* Protection on the bound address list is not needed since
6293	* in the socket option context we hold a socket lock and
6294	* thus the bound address list can't change.
6295	*/
6296	list_for_each_entry(addr, &bp->address_list, list) {
6297	memcpy(&temp, &addr->a, sizeof(temp));
6298	addrlen = sctp_get_pf_specific(family: sk->sk_family)
6299	->addr_to_user(sp, &temp);
6300	if (space_left < addrlen) {
6301	err = -ENOMEM; /*fixme: right error?*/
6302	goto out;
6303	}
6304	memcpy(buf, &temp, addrlen);
6305	buf += addrlen;
6306	bytes_copied += addrlen;
6307	cnt++;
6308	space_left -= addrlen;
6309	}
6310
6311	copy_getaddrs:
6312	if (copy_to_user(to, from: addrs, n: bytes_copied)) {
6313	err = -EFAULT;
6314	goto out;
6315	}
6316	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6317	err = -EFAULT;
6318	goto out;
6319	}
6320	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6321	* but we can't change it anymore.
6322	*/
6323	if (put_user(bytes_copied, optlen))
6324	err = -EFAULT;
6325	out:
6326	kfree(objp: addrs);
6327	return err;
6328	}
6329
6330	/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6331	*
6332	* Requests that the local SCTP stack use the enclosed peer address as
6333	* the association primary. The enclosed address must be one of the
6334	* association peer's addresses.
6335	*/
6336	static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6337	char __user *optval, int __user *optlen)
6338	{
6339	struct sctp_prim prim;
6340	struct sctp_association *asoc;
6341	struct sctp_sock *sp = sctp_sk(sk);
6342
6343	if (len < sizeof(struct sctp_prim))
6344	return -EINVAL;
6345
6346	len = sizeof(struct sctp_prim);
6347
6348	if (copy_from_user(to: &prim, from: optval, n: len))
6349	return -EFAULT;
6350
6351	asoc = sctp_id2assoc(sk, id: prim.ssp_assoc_id);
6352	if (!asoc)
6353	return -EINVAL;
6354
6355	if (!asoc->peer.primary_path)
6356	return -ENOTCONN;
6357
6358	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6359	asoc->peer.primary_path->af_specific->sockaddr_len);
6360
6361	sctp_get_pf_specific(family: sk->sk_family)->addr_to_user(sp,
6362	(union sctp_addr *)&prim.ssp_addr);
6363
6364	if (put_user(len, optlen))
6365	return -EFAULT;
6366	if (copy_to_user(to: optval, from: &prim, n: len))
6367	return -EFAULT;
6368
6369	return 0;
6370	}
6371
6372	/*
6373	* 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6374	*
6375	* Requests that the local endpoint set the specified Adaptation Layer
6376	* Indication parameter for all future INIT and INIT-ACK exchanges.
6377	*/
6378	static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6379	char __user *optval, int __user *optlen)
6380	{
6381	struct sctp_setadaptation adaptation;
6382
6383	if (len < sizeof(struct sctp_setadaptation))
6384	return -EINVAL;
6385
6386	len = sizeof(struct sctp_setadaptation);
6387
6388	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6389
6390	if (put_user(len, optlen))
6391	return -EFAULT;
6392	if (copy_to_user(to: optval, from: &adaptation, n: len))
6393	return -EFAULT;
6394
6395	return 0;
6396	}
6397
6398	/*
6399	*
6400	* 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6401	*
6402	* Applications that wish to use the sendto() system call may wish to
6403	* specify a default set of parameters that would normally be supplied
6404	* through the inclusion of ancillary data. This socket option allows
6405	* such an application to set the default sctp_sndrcvinfo structure.
6406
6407
6408	* The application that wishes to use this socket option simply passes
6409	* in to this call the sctp_sndrcvinfo structure defined in Section
6410	* 5.2.2) The input parameters accepted by this call include
6411	* sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6412	* sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6413	* to this call if the caller is using the UDP model.
6414	*
6415	* For getsockopt, it get the default sctp_sndrcvinfo structure.
6416	*/
6417	static int sctp_getsockopt_default_send_param(struct sock *sk,
6418	int len, char __user *optval,
6419	int __user *optlen)
6420	{
6421	struct sctp_sock *sp = sctp_sk(sk);
6422	struct sctp_association *asoc;
6423	struct sctp_sndrcvinfo info;
6424
6425	if (len < sizeof(info))
6426	return -EINVAL;
6427
6428	len = sizeof(info);
6429
6430	if (copy_from_user(to: &info, from: optval, n: len))
6431	return -EFAULT;
6432
6433	asoc = sctp_id2assoc(sk, id: info.sinfo_assoc_id);
6434	if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6435	sctp_style(sk, UDP))
6436	return -EINVAL;
6437
6438	if (asoc) {
6439	info.sinfo_stream = asoc->default_stream;
6440	info.sinfo_flags = asoc->default_flags;
6441	info.sinfo_ppid = asoc->default_ppid;
6442	info.sinfo_context = asoc->default_context;
6443	info.sinfo_timetolive = asoc->default_timetolive;
6444	} else {
6445	info.sinfo_stream = sp->default_stream;
6446	info.sinfo_flags = sp->default_flags;
6447	info.sinfo_ppid = sp->default_ppid;
6448	info.sinfo_context = sp->default_context;
6449	info.sinfo_timetolive = sp->default_timetolive;
6450	}
6451
6452	if (put_user(len, optlen))
6453	return -EFAULT;
6454	if (copy_to_user(to: optval, from: &info, n: len))
6455	return -EFAULT;
6456
6457	return 0;
6458	}
6459
6460	/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6461	* (SCTP_DEFAULT_SNDINFO)
6462	*/
6463	static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6464	char __user *optval,
6465	int __user *optlen)
6466	{
6467	struct sctp_sock *sp = sctp_sk(sk);
6468	struct sctp_association *asoc;
6469	struct sctp_sndinfo info;
6470
6471	if (len < sizeof(info))
6472	return -EINVAL;
6473
6474	len = sizeof(info);
6475
6476	if (copy_from_user(to: &info, from: optval, n: len))
6477	return -EFAULT;
6478
6479	asoc = sctp_id2assoc(sk, id: info.snd_assoc_id);
6480	if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6481	sctp_style(sk, UDP))
6482	return -EINVAL;
6483
6484	if (asoc) {
6485	info.snd_sid = asoc->default_stream;
6486	info.snd_flags = asoc->default_flags;
6487	info.snd_ppid = asoc->default_ppid;
6488	info.snd_context = asoc->default_context;
6489	} else {
6490	info.snd_sid = sp->default_stream;
6491	info.snd_flags = sp->default_flags;
6492	info.snd_ppid = sp->default_ppid;
6493	info.snd_context = sp->default_context;
6494	}
6495
6496	if (put_user(len, optlen))
6497	return -EFAULT;
6498	if (copy_to_user(to: optval, from: &info, n: len))
6499	return -EFAULT;
6500
6501	return 0;
6502	}
6503
6504	/*
6505	*
6506	* 7.1.5 SCTP_NODELAY
6507	*
6508	* Turn on/off any Nagle-like algorithm. This means that packets are
6509	* generally sent as soon as possible and no unnecessary delays are
6510	* introduced, at the cost of more packets in the network. Expects an
6511	* integer boolean flag.
6512	*/
6513
6514	static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6515	char __user *optval, int __user *optlen)
6516	{
6517	int val;
6518
6519	if (len < sizeof(int))
6520	return -EINVAL;
6521
6522	len = sizeof(int);
6523	val = (sctp_sk(sk)->nodelay == 1);
6524	if (put_user(len, optlen))
6525	return -EFAULT;
6526	if (copy_to_user(to: optval, from: &val, n: len))
6527	return -EFAULT;
6528	return 0;
6529	}
6530
6531	/*
6532	*
6533	* 7.1.1 SCTP_RTOINFO
6534	*
6535	* The protocol parameters used to initialize and bound retransmission
6536	* timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6537	* and modify these parameters.
6538	* All parameters are time values, in milliseconds. A value of 0, when
6539	* modifying the parameters, indicates that the current value should not
6540	* be changed.
6541	*
6542	*/
6543	static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6544	char __user *optval,
6545	int __user *optlen) {
6546	struct sctp_rtoinfo rtoinfo;
6547	struct sctp_association *asoc;
6548
6549	if (len < sizeof (struct sctp_rtoinfo))
6550	return -EINVAL;
6551
6552	len = sizeof(struct sctp_rtoinfo);
6553
6554	if (copy_from_user(to: &rtoinfo, from: optval, n: len))
6555	return -EFAULT;
6556
6557	asoc = sctp_id2assoc(sk, id: rtoinfo.srto_assoc_id);
6558
6559	if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6560	sctp_style(sk, UDP))
6561	return -EINVAL;
6562
6563	/* Values corresponding to the specific association. */
6564	if (asoc) {
6565	rtoinfo.srto_initial = jiffies_to_msecs(j: asoc->rto_initial);
6566	rtoinfo.srto_max = jiffies_to_msecs(j: asoc->rto_max);
6567	rtoinfo.srto_min = jiffies_to_msecs(j: asoc->rto_min);
6568	} else {
6569	/* Values corresponding to the endpoint. */
6570	struct sctp_sock *sp = sctp_sk(sk);
6571
6572	rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6573	rtoinfo.srto_max = sp->rtoinfo.srto_max;
6574	rtoinfo.srto_min = sp->rtoinfo.srto_min;
6575	}
6576
6577	if (put_user(len, optlen))
6578	return -EFAULT;
6579
6580	if (copy_to_user(to: optval, from: &rtoinfo, n: len))
6581	return -EFAULT;
6582
6583	return 0;
6584	}
6585
6586	/*
6587	*
6588	* 7.1.2 SCTP_ASSOCINFO
6589	*
6590	* This option is used to tune the maximum retransmission attempts
6591	* of the association.
6592	* Returns an error if the new association retransmission value is
6593	* greater than the sum of the retransmission value of the peer.
6594	* See [SCTP] for more information.
6595	*
6596	*/
6597	static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6598	char __user *optval,
6599	int __user *optlen)
6600	{
6601
6602	struct sctp_assocparams assocparams;
6603	struct sctp_association *asoc;
6604	struct list_head *pos;
6605	int cnt = 0;
6606
6607	if (len < sizeof (struct sctp_assocparams))
6608	return -EINVAL;
6609
6610	len = sizeof(struct sctp_assocparams);
6611
6612	if (copy_from_user(to: &assocparams, from: optval, n: len))
6613	return -EFAULT;
6614
6615	asoc = sctp_id2assoc(sk, id: assocparams.sasoc_assoc_id);
6616
6617	if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6618	sctp_style(sk, UDP))
6619	return -EINVAL;
6620
6621	/* Values correspoinding to the specific association */
6622	if (asoc) {
6623	assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6624	assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6625	assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6626	assocparams.sasoc_cookie_life = ktime_to_ms(kt: asoc->cookie_life);
6627
6628	list_for_each(pos, &asoc->peer.transport_addr_list) {
6629	cnt++;
6630	}
6631
6632	assocparams.sasoc_number_peer_destinations = cnt;
6633	} else {
6634	/* Values corresponding to the endpoint */
6635	struct sctp_sock *sp = sctp_sk(sk);
6636
6637	assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6638	assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6639	assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6640	assocparams.sasoc_cookie_life =
6641	sp->assocparams.sasoc_cookie_life;
6642	assocparams.sasoc_number_peer_destinations =
6643	sp->assocparams.
6644	sasoc_number_peer_destinations;
6645	}
6646
6647	if (put_user(len, optlen))
6648	return -EFAULT;
6649
6650	if (copy_to_user(to: optval, from: &assocparams, n: len))
6651	return -EFAULT;
6652
6653	return 0;
6654	}
6655
6656	/*
6657	* 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6658	*
6659	* This socket option is a boolean flag which turns on or off mapped V4
6660	* addresses. If this option is turned on and the socket is type
6661	* PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6662	* If this option is turned off, then no mapping will be done of V4
6663	* addresses and a user will receive both PF_INET6 and PF_INET type
6664	* addresses on the socket.
6665	*/
6666	static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6667	char __user *optval, int __user *optlen)
6668	{
6669	int val;
6670	struct sctp_sock *sp = sctp_sk(sk);
6671
6672	if (len < sizeof(int))
6673	return -EINVAL;
6674
6675	len = sizeof(int);
6676	val = sp->v4mapped;
6677	if (put_user(len, optlen))
6678	return -EFAULT;
6679	if (copy_to_user(to: optval, from: &val, n: len))
6680	return -EFAULT;
6681
6682	return 0;
6683	}
6684
6685	/*
6686	* 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6687	* (chapter and verse is quoted at sctp_setsockopt_context())
6688	*/
6689	static int sctp_getsockopt_context(struct sock *sk, int len,
6690	char __user *optval, int __user *optlen)
6691	{
6692	struct sctp_assoc_value params;
6693	struct sctp_association *asoc;
6694
6695	if (len < sizeof(struct sctp_assoc_value))
6696	return -EINVAL;
6697
6698	len = sizeof(struct sctp_assoc_value);
6699
6700	if (copy_from_user(to: &params, from: optval, n: len))
6701	return -EFAULT;
6702
6703	asoc = sctp_id2assoc(sk, id: params.assoc_id);
6704	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6705	sctp_style(sk, UDP))
6706	return -EINVAL;
6707
6708	params.assoc_value = asoc ? asoc->default_rcv_context
6709	: sctp_sk(sk)->default_rcv_context;
6710
6711	if (put_user(len, optlen))
6712	return -EFAULT;
6713	if (copy_to_user(to: optval, from: &params, n: len))
6714	return -EFAULT;
6715
6716	return 0;
6717	}
6718
6719	/*
6720	* 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6721	* This option will get or set the maximum size to put in any outgoing
6722	* SCTP DATA chunk. If a message is larger than this size it will be
6723	* fragmented by SCTP into the specified size. Note that the underlying
6724	* SCTP implementation may fragment into smaller sized chunks when the
6725	* PMTU of the underlying association is smaller than the value set by
6726	* the user. The default value for this option is '0' which indicates
6727	* the user is NOT limiting fragmentation and only the PMTU will effect
6728	* SCTP's choice of DATA chunk size. Note also that values set larger
6729	* than the maximum size of an IP datagram will effectively let SCTP
6730	* control fragmentation (i.e. the same as setting this option to 0).
6731	*
6732	* The following structure is used to access and modify this parameter:
6733	*
6734	* struct sctp_assoc_value {
6735	* sctp_assoc_t assoc_id;
6736	* uint32_t assoc_value;
6737	* };
6738	*
6739	* assoc_id: This parameter is ignored for one-to-one style sockets.
6740	* For one-to-many style sockets this parameter indicates which
6741	* association the user is performing an action upon. Note that if
6742	* this field's value is zero then the endpoints default value is
6743	* changed (effecting future associations only).
6744	* assoc_value: This parameter specifies the maximum size in bytes.
6745	*/
6746	static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6747	char __user *optval, int __user *optlen)
6748	{
6749	struct sctp_assoc_value params;
6750	struct sctp_association *asoc;
6751
6752	if (len == sizeof(int)) {
6753	pr_warn_ratelimited(DEPRECATED
6754	"%s (pid %d) "
6755	"Use of int in maxseg socket option.\n"
6756	"Use struct sctp_assoc_value instead\n",
6757	current->comm, task_pid_nr(current));
6758	params.assoc_id = SCTP_FUTURE_ASSOC;
6759	} else if (len >= sizeof(struct sctp_assoc_value)) {
6760	len = sizeof(struct sctp_assoc_value);
6761	if (copy_from_user(to: &params, from: optval, n: len))
6762	return -EFAULT;
6763	} else
6764	return -EINVAL;
6765
6766	asoc = sctp_id2assoc(sk, id: params.assoc_id);
6767	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6768	sctp_style(sk, UDP))
6769	return -EINVAL;
6770
6771	if (asoc)
6772	params.assoc_value = asoc->frag_point;
6773	else
6774	params.assoc_value = sctp_sk(sk)->user_frag;
6775
6776	if (put_user(len, optlen))
6777	return -EFAULT;
6778	if (len == sizeof(int)) {
6779	if (copy_to_user(to: optval, from: &params.assoc_value, n: len))
6780	return -EFAULT;
6781	} else {
6782	if (copy_to_user(to: optval, from: &params, n: len))
6783	return -EFAULT;
6784	}
6785
6786	return 0;
6787	}
6788
6789	/*
6790	* 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6791	* (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6792	*/
6793	static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6794	char __user *optval, int __user *optlen)
6795	{
6796	int val;
6797
6798	if (len < sizeof(int))
6799	return -EINVAL;
6800
6801	len = sizeof(int);
6802
6803	val = sctp_sk(sk)->frag_interleave;
6804	if (put_user(len, optlen))
6805	return -EFAULT;
6806	if (copy_to_user(to: optval, from: &val, n: len))
6807	return -EFAULT;
6808
6809	return 0;
6810	}
6811
6812	/*
6813	* 7.1.25. Set or Get the sctp partial delivery point
6814	* (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6815	*/
6816	static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6817	char __user *optval,
6818	int __user *optlen)
6819	{
6820	u32 val;
6821
6822	if (len < sizeof(u32))
6823	return -EINVAL;
6824
6825	len = sizeof(u32);
6826
6827	val = sctp_sk(sk)->pd_point;
6828	if (put_user(len, optlen))
6829	return -EFAULT;
6830	if (copy_to_user(to: optval, from: &val, n: len))
6831	return -EFAULT;
6832
6833	return 0;
6834	}
6835
6836	/*
6837	* 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6838	* (chapter and verse is quoted at sctp_setsockopt_maxburst())
6839	*/
6840	static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6841	char __user *optval,
6842	int __user *optlen)
6843	{
6844	struct sctp_assoc_value params;
6845	struct sctp_association *asoc;
6846
6847	if (len == sizeof(int)) {
6848	pr_warn_ratelimited(DEPRECATED
6849	"%s (pid %d) "
6850	"Use of int in max_burst socket option.\n"
6851	"Use struct sctp_assoc_value instead\n",
6852	current->comm, task_pid_nr(current));
6853	params.assoc_id = SCTP_FUTURE_ASSOC;
6854	} else if (len >= sizeof(struct sctp_assoc_value)) {
6855	len = sizeof(struct sctp_assoc_value);
6856	if (copy_from_user(to: &params, from: optval, n: len))
6857	return -EFAULT;
6858	} else
6859	return -EINVAL;
6860
6861	asoc = sctp_id2assoc(sk, id: params.assoc_id);
6862	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6863	sctp_style(sk, UDP))
6864	return -EINVAL;
6865
6866	params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6867
6868	if (len == sizeof(int)) {
6869	if (copy_to_user(to: optval, from: &params.assoc_value, n: len))
6870	return -EFAULT;
6871	} else {
6872	if (copy_to_user(to: optval, from: &params, n: len))
6873	return -EFAULT;
6874	}
6875
6876	return 0;
6877
6878	}
6879
6880	static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6881	char __user *optval, int __user *optlen)
6882	{
6883	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6884	struct sctp_hmacalgo __user *p = (void __user *)optval;
6885	struct sctp_hmac_algo_param *hmacs;
6886	__u16 data_len = 0;
6887	u32 num_idents;
6888	int i;
6889
6890	if (!ep->auth_enable)
6891	return -EACCES;
6892
6893	hmacs = ep->auth_hmacs_list;
6894	data_len = ntohs(hmacs->param_hdr.length) -
6895	sizeof(struct sctp_paramhdr);
6896
6897	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6898	return -EINVAL;
6899
6900	len = sizeof(struct sctp_hmacalgo) + data_len;
6901	num_idents = data_len / sizeof(u16);
6902
6903	if (put_user(len, optlen))
6904	return -EFAULT;
6905	if (put_user(num_idents, &p->shmac_num_idents))
6906	return -EFAULT;
6907	for (i = 0; i < num_idents; i++) {
6908	__u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6909
6910	if (copy_to_user(to: &p->shmac_idents[i], from: &hmacid, n: sizeof(__u16)))
6911	return -EFAULT;
6912	}
6913	return 0;
6914	}
6915
6916	static int sctp_getsockopt_active_key(struct sock *sk, int len,
6917	char __user *optval, int __user *optlen)
6918	{
6919	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6920	struct sctp_authkeyid val;
6921	struct sctp_association *asoc;
6922
6923	if (len < sizeof(struct sctp_authkeyid))
6924	return -EINVAL;
6925
6926	len = sizeof(struct sctp_authkeyid);
6927	if (copy_from_user(to: &val, from: optval, n: len))
6928	return -EFAULT;
6929
6930	asoc = sctp_id2assoc(sk, id: val.scact_assoc_id);
6931	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6932	return -EINVAL;
6933
6934	if (asoc) {
6935	if (!asoc->peer.auth_capable)
6936	return -EACCES;
6937	val.scact_keynumber = asoc->active_key_id;
6938	} else {
6939	if (!ep->auth_enable)
6940	return -EACCES;
6941	val.scact_keynumber = ep->active_key_id;
6942	}
6943
6944	if (put_user(len, optlen))
6945	return -EFAULT;
6946	if (copy_to_user(to: optval, from: &val, n: len))
6947	return -EFAULT;
6948
6949	return 0;
6950	}
6951
6952	static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6953	char __user *optval, int __user *optlen)
6954	{
6955	struct sctp_authchunks __user *p = (void __user *)optval;
6956	struct sctp_authchunks val;
6957	struct sctp_association *asoc;
6958	struct sctp_chunks_param *ch;
6959	u32 num_chunks = 0;
6960	char __user *to;
6961
6962	if (len < sizeof(struct sctp_authchunks))
6963	return -EINVAL;
6964
6965	if (copy_from_user(to: &val, from: optval, n: sizeof(val)))
6966	return -EFAULT;
6967
6968	to = p->gauth_chunks;
6969	asoc = sctp_id2assoc(sk, id: val.gauth_assoc_id);
6970	if (!asoc)
6971	return -EINVAL;
6972
6973	if (!asoc->peer.auth_capable)
6974	return -EACCES;
6975
6976	ch = asoc->peer.peer_chunks;
6977	if (!ch)
6978	goto num;
6979
6980	/* See if the user provided enough room for all the data */
6981	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6982	if (len < num_chunks)
6983	return -EINVAL;
6984
6985	if (copy_to_user(to, from: ch->chunks, n: num_chunks))
6986	return -EFAULT;
6987	num:
6988	len = sizeof(struct sctp_authchunks) + num_chunks;
6989	if (put_user(len, optlen))
6990	return -EFAULT;
6991	if (put_user(num_chunks, &p->gauth_number_of_chunks))
6992	return -EFAULT;
6993	return 0;
6994	}
6995
6996	static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6997	char __user *optval, int __user *optlen)
6998	{
6999	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7000	struct sctp_authchunks __user *p = (void __user *)optval;
7001	struct sctp_authchunks val;
7002	struct sctp_association *asoc;
7003	struct sctp_chunks_param *ch;
7004	u32 num_chunks = 0;
7005	char __user *to;
7006
7007	if (len < sizeof(struct sctp_authchunks))
7008	return -EINVAL;
7009
7010	if (copy_from_user(to: &val, from: optval, n: sizeof(val)))
7011	return -EFAULT;
7012
7013	to = p->gauth_chunks;
7014	asoc = sctp_id2assoc(sk, id: val.gauth_assoc_id);
7015	if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7016	sctp_style(sk, UDP))
7017	return -EINVAL;
7018
7019	if (asoc) {
7020	if (!asoc->peer.auth_capable)
7021	return -EACCES;
7022	ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7023	} else {
7024	if (!ep->auth_enable)
7025	return -EACCES;
7026	ch = ep->auth_chunk_list;
7027	}
7028	if (!ch)
7029	goto num;
7030
7031	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7032	if (len < sizeof(struct sctp_authchunks) + num_chunks)
7033	return -EINVAL;
7034
7035	if (copy_to_user(to, from: ch->chunks, n: num_chunks))
7036	return -EFAULT;
7037	num:
7038	len = sizeof(struct sctp_authchunks) + num_chunks;
7039	if (put_user(len, optlen))
7040	return -EFAULT;
7041	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7042	return -EFAULT;
7043
7044	return 0;
7045	}
7046
7047	/*
7048	* 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7049	* This option gets the current number of associations that are attached
7050	* to a one-to-many style socket. The option value is an uint32_t.
7051	*/
7052	static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7053	char __user *optval, int __user *optlen)
7054	{
7055	struct sctp_sock *sp = sctp_sk(sk);
7056	struct sctp_association *asoc;
7057	u32 val = 0;
7058
7059	if (sctp_style(sk, TCP))
7060	return -EOPNOTSUPP;
7061
7062	if (len < sizeof(u32))
7063	return -EINVAL;
7064
7065	len = sizeof(u32);
7066
7067	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7068	val++;
7069	}
7070
7071	if (put_user(len, optlen))
7072	return -EFAULT;
7073	if (copy_to_user(to: optval, from: &val, n: len))
7074	return -EFAULT;
7075
7076	return 0;
7077	}
7078
7079	/*
7080	* 8.1.23 SCTP_AUTO_ASCONF
7081	* See the corresponding setsockopt entry as description
7082	*/
7083	static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7084	char __user *optval, int __user *optlen)
7085	{
7086	int val = 0;
7087
7088	if (len < sizeof(int))
7089	return -EINVAL;
7090
7091	len = sizeof(int);
7092	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7093	val = 1;
7094	if (put_user(len, optlen))
7095	return -EFAULT;
7096	if (copy_to_user(to: optval, from: &val, n: len))
7097	return -EFAULT;
7098	return 0;
7099	}
7100
7101	/*
7102	* 8.2.6. Get the Current Identifiers of Associations
7103	* (SCTP_GET_ASSOC_ID_LIST)
7104	*
7105	* This option gets the current list of SCTP association identifiers of
7106	* the SCTP associations handled by a one-to-many style socket.
7107	*/
7108	static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7109	char __user *optval, int __user *optlen)
7110	{
7111	struct sctp_sock *sp = sctp_sk(sk);
7112	struct sctp_association *asoc;
7113	struct sctp_assoc_ids *ids;
7114	u32 num = 0;
7115
7116	if (sctp_style(sk, TCP))
7117	return -EOPNOTSUPP;
7118
7119	if (len < sizeof(struct sctp_assoc_ids))
7120	return -EINVAL;
7121
7122	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7123	num++;
7124	}
7125
7126	if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7127	return -EINVAL;
7128
7129	len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7130
7131	ids = kmalloc(size: len, GFP_USER | __GFP_NOWARN);
7132	if (unlikely(!ids))
7133	return -ENOMEM;
7134
7135	ids->gaids_number_of_ids = num;
7136	num = 0;
7137	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7138	ids->gaids_assoc_id[num++] = asoc->assoc_id;
7139	}
7140
7141	if (put_user(len, optlen) || copy_to_user(to: optval, from: ids, n: len)) {
7142	kfree(objp: ids);
7143	return -EFAULT;
7144	}
7145
7146	kfree(objp: ids);
7147	return 0;
7148	}
7149
7150	/*
7151	* SCTP_PEER_ADDR_THLDS
7152	*
7153	* This option allows us to fetch the partially failed threshold for one or all
7154	* transports in an association. See Section 6.1 of:
7155	* http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7156	*/
7157	static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7158	char __user *optval, int len,
7159	int __user *optlen, bool v2)
7160	{
7161	struct sctp_paddrthlds_v2 val;
7162	struct sctp_transport *trans;
7163	struct sctp_association *asoc;
7164	int min;
7165
7166	min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7167	if (len < min)
7168	return -EINVAL;
7169	len = min;
7170	if (copy_from_user(to: &val, from: optval, n: len))
7171	return -EFAULT;
7172
7173	if (!sctp_is_any(sk, addr: (const union sctp_addr *)&val.spt_address)) {
7174	trans = sctp_addr_id2transport(sk, addr: &val.spt_address,
7175	id: val.spt_assoc_id);
7176	if (!trans)
7177	return -ENOENT;
7178
7179	val.spt_pathmaxrxt = trans->pathmaxrxt;
7180	val.spt_pathpfthld = trans->pf_retrans;
7181	val.spt_pathcpthld = trans->ps_retrans;
7182
7183	goto out;
7184	}
7185
7186	asoc = sctp_id2assoc(sk, id: val.spt_assoc_id);
7187	if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7188	sctp_style(sk, UDP))
7189	return -EINVAL;
7190
7191	if (asoc) {
7192	val.spt_pathpfthld = asoc->pf_retrans;
7193	val.spt_pathmaxrxt = asoc->pathmaxrxt;
7194	val.spt_pathcpthld = asoc->ps_retrans;
7195	} else {
7196	struct sctp_sock *sp = sctp_sk(sk);
7197
7198	val.spt_pathpfthld = sp->pf_retrans;
7199	val.spt_pathmaxrxt = sp->pathmaxrxt;
7200	val.spt_pathcpthld = sp->ps_retrans;
7201	}
7202
7203	out:
7204	if (put_user(len, optlen) || copy_to_user(to: optval, from: &val, n: len))
7205	return -EFAULT;
7206
7207	return 0;
7208	}
7209
7210	/*
7211	* SCTP_GET_ASSOC_STATS
7212	*
7213	* This option retrieves local per endpoint statistics. It is modeled
7214	* after OpenSolaris' implementation
7215	*/
7216	static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7217	char __user *optval,
7218	int __user *optlen)
7219	{
7220	struct sctp_assoc_stats sas;
7221	struct sctp_association *asoc = NULL;
7222
7223	/* User must provide at least the assoc id */
7224	if (len < sizeof(sctp_assoc_t))
7225	return -EINVAL;
7226
7227	/* Allow the struct to grow and fill in as much as possible */
7228	len = min_t(size_t, len, sizeof(sas));
7229
7230	if (copy_from_user(to: &sas, from: optval, n: len))
7231	return -EFAULT;
7232
7233	asoc = sctp_id2assoc(sk, id: sas.sas_assoc_id);
7234	if (!asoc)
7235	return -EINVAL;
7236
7237	sas.sas_rtxchunks = asoc->stats.rtxchunks;
7238	sas.sas_gapcnt = asoc->stats.gapcnt;
7239	sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7240	sas.sas_osacks = asoc->stats.osacks;
7241	sas.sas_isacks = asoc->stats.isacks;
7242	sas.sas_octrlchunks = asoc->stats.octrlchunks;
7243	sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7244	sas.sas_oodchunks = asoc->stats.oodchunks;
7245	sas.sas_iodchunks = asoc->stats.iodchunks;
7246	sas.sas_ouodchunks = asoc->stats.ouodchunks;
7247	sas.sas_iuodchunks = asoc->stats.iuodchunks;
7248	sas.sas_idupchunks = asoc->stats.idupchunks;
7249	sas.sas_opackets = asoc->stats.opackets;
7250	sas.sas_ipackets = asoc->stats.ipackets;
7251
7252	/* New high max rto observed, will return 0 if not a single
7253	* RTO update took place. obs_rto_ipaddr will be bogus
7254	* in such a case
7255	*/
7256	sas.sas_maxrto = asoc->stats.max_obs_rto;
7257	memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7258	sizeof(struct sockaddr_storage));
7259
7260	/* Mark beginning of a new observation period */
7261	asoc->stats.max_obs_rto = asoc->rto_min;
7262
7263	if (put_user(len, optlen))
7264	return -EFAULT;
7265
7266	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7267
7268	if (copy_to_user(to: optval, from: &sas, n: len))
7269	return -EFAULT;
7270
7271	return 0;
7272	}
7273
7274	static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7275	char __user *optval,
7276	int __user *optlen)
7277	{
7278	int val = 0;
7279
7280	if (len < sizeof(int))
7281	return -EINVAL;
7282
7283	len = sizeof(int);
7284	if (sctp_sk(sk)->recvrcvinfo)
7285	val = 1;
7286	if (put_user(len, optlen))
7287	return -EFAULT;
7288	if (copy_to_user(to: optval, from: &val, n: len))
7289	return -EFAULT;
7290
7291	return 0;
7292	}
7293
7294	static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7295	char __user *optval,
7296	int __user *optlen)
7297	{
7298	int val = 0;
7299
7300	if (len < sizeof(int))
7301	return -EINVAL;
7302
7303	len = sizeof(int);
7304	if (sctp_sk(sk)->recvnxtinfo)
7305	val = 1;
7306	if (put_user(len, optlen))
7307	return -EFAULT;
7308	if (copy_to_user(to: optval, from: &val, n: len))
7309	return -EFAULT;
7310
7311	return 0;
7312	}
7313
7314	static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7315	char __user *optval,
7316	int __user *optlen)
7317	{
7318	struct sctp_assoc_value params;
7319	struct sctp_association *asoc;
7320	int retval = -EFAULT;
7321
7322	if (len < sizeof(params)) {
7323	retval = -EINVAL;
7324	goto out;
7325	}
7326
7327	len = sizeof(params);
7328	if (copy_from_user(to: &params, from: optval, n: len))
7329	goto out;
7330
7331	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7332	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7333	sctp_style(sk, UDP)) {
7334	retval = -EINVAL;
7335	goto out;
7336	}
7337
7338	params.assoc_value = asoc ? asoc->peer.prsctp_capable
7339	: sctp_sk(sk)->ep->prsctp_enable;
7340
7341	if (put_user(len, optlen))
7342	goto out;
7343
7344	if (copy_to_user(to: optval, from: &params, n: len))
7345	goto out;
7346
7347	retval = 0;
7348
7349	out:
7350	return retval;
7351	}
7352
7353	static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7354	char __user *optval,
7355	int __user *optlen)
7356	{
7357	struct sctp_default_prinfo info;
7358	struct sctp_association *asoc;
7359	int retval = -EFAULT;
7360
7361	if (len < sizeof(info)) {
7362	retval = -EINVAL;
7363	goto out;
7364	}
7365
7366	len = sizeof(info);
7367	if (copy_from_user(to: &info, from: optval, n: len))
7368	goto out;
7369
7370	asoc = sctp_id2assoc(sk, id: info.pr_assoc_id);
7371	if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7372	sctp_style(sk, UDP)) {
7373	retval = -EINVAL;
7374	goto out;
7375	}
7376
7377	if (asoc) {
7378	info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7379	info.pr_value = asoc->default_timetolive;
7380	} else {
7381	struct sctp_sock *sp = sctp_sk(sk);
7382
7383	info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7384	info.pr_value = sp->default_timetolive;
7385	}
7386
7387	if (put_user(len, optlen))
7388	goto out;
7389
7390	if (copy_to_user(to: optval, from: &info, n: len))
7391	goto out;
7392
7393	retval = 0;
7394
7395	out:
7396	return retval;
7397	}
7398
7399	static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7400	char __user *optval,
7401	int __user *optlen)
7402	{
7403	struct sctp_prstatus params;
7404	struct sctp_association *asoc;
7405	int policy;
7406	int retval = -EINVAL;
7407
7408	if (len < sizeof(params))
7409	goto out;
7410
7411	len = sizeof(params);
7412	if (copy_from_user(to: &params, from: optval, n: len)) {
7413	retval = -EFAULT;
7414	goto out;
7415	}
7416
7417	policy = params.sprstat_policy;
7418	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7419	((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7420	goto out;
7421
7422	asoc = sctp_id2assoc(sk, id: params.sprstat_assoc_id);
7423	if (!asoc)
7424	goto out;
7425
7426	if (policy == SCTP_PR_SCTP_ALL) {
7427	params.sprstat_abandoned_unsent = 0;
7428	params.sprstat_abandoned_sent = 0;
7429	for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7430	params.sprstat_abandoned_unsent +=
7431	asoc->abandoned_unsent[policy];
7432	params.sprstat_abandoned_sent +=
7433	asoc->abandoned_sent[policy];
7434	}
7435	} else {
7436	params.sprstat_abandoned_unsent =
7437	asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7438	params.sprstat_abandoned_sent =
7439	asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7440	}
7441
7442	if (put_user(len, optlen)) {
7443	retval = -EFAULT;
7444	goto out;
7445	}
7446
7447	if (copy_to_user(to: optval, from: &params, n: len)) {
7448	retval = -EFAULT;
7449	goto out;
7450	}
7451
7452	retval = 0;
7453
7454	out:
7455	return retval;
7456	}
7457
7458	static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7459	char __user *optval,
7460	int __user *optlen)
7461	{
7462	struct sctp_stream_out_ext *streamoute;
7463	struct sctp_association *asoc;
7464	struct sctp_prstatus params;
7465	int retval = -EINVAL;
7466	int policy;
7467
7468	if (len < sizeof(params))
7469	goto out;
7470
7471	len = sizeof(params);
7472	if (copy_from_user(to: &params, from: optval, n: len)) {
7473	retval = -EFAULT;
7474	goto out;
7475	}
7476
7477	policy = params.sprstat_policy;
7478	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7479	((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7480	goto out;
7481
7482	asoc = sctp_id2assoc(sk, id: params.sprstat_assoc_id);
7483	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7484	goto out;
7485
7486	streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7487	if (!streamoute) {
7488	/* Not allocated yet, means all stats are 0 */
7489	params.sprstat_abandoned_unsent = 0;
7490	params.sprstat_abandoned_sent = 0;
7491	retval = 0;
7492	goto out;
7493	}
7494
7495	if (policy == SCTP_PR_SCTP_ALL) {
7496	params.sprstat_abandoned_unsent = 0;
7497	params.sprstat_abandoned_sent = 0;
7498	for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7499	params.sprstat_abandoned_unsent +=
7500	streamoute->abandoned_unsent[policy];
7501	params.sprstat_abandoned_sent +=
7502	streamoute->abandoned_sent[policy];
7503	}
7504	} else {
7505	params.sprstat_abandoned_unsent =
7506	streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7507	params.sprstat_abandoned_sent =
7508	streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7509	}
7510
7511	if (put_user(len, optlen) || copy_to_user(to: optval, from: &params, n: len)) {
7512	retval = -EFAULT;
7513	goto out;
7514	}
7515
7516	retval = 0;
7517
7518	out:
7519	return retval;
7520	}
7521
7522	static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7523	char __user *optval,
7524	int __user *optlen)
7525	{
7526	struct sctp_assoc_value params;
7527	struct sctp_association *asoc;
7528	int retval = -EFAULT;
7529
7530	if (len < sizeof(params)) {
7531	retval = -EINVAL;
7532	goto out;
7533	}
7534
7535	len = sizeof(params);
7536	if (copy_from_user(to: &params, from: optval, n: len))
7537	goto out;
7538
7539	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7540	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7541	sctp_style(sk, UDP)) {
7542	retval = -EINVAL;
7543	goto out;
7544	}
7545
7546	params.assoc_value = asoc ? asoc->peer.reconf_capable
7547	: sctp_sk(sk)->ep->reconf_enable;
7548
7549	if (put_user(len, optlen))
7550	goto out;
7551
7552	if (copy_to_user(to: optval, from: &params, n: len))
7553	goto out;
7554
7555	retval = 0;
7556
7557	out:
7558	return retval;
7559	}
7560
7561	static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7562	char __user *optval,
7563	int __user *optlen)
7564	{
7565	struct sctp_assoc_value params;
7566	struct sctp_association *asoc;
7567	int retval = -EFAULT;
7568
7569	if (len < sizeof(params)) {
7570	retval = -EINVAL;
7571	goto out;
7572	}
7573
7574	len = sizeof(params);
7575	if (copy_from_user(to: &params, from: optval, n: len))
7576	goto out;
7577
7578	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7579	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7580	sctp_style(sk, UDP)) {
7581	retval = -EINVAL;
7582	goto out;
7583	}
7584
7585	params.assoc_value = asoc ? asoc->strreset_enable
7586	: sctp_sk(sk)->ep->strreset_enable;
7587
7588	if (put_user(len, optlen))
7589	goto out;
7590
7591	if (copy_to_user(to: optval, from: &params, n: len))
7592	goto out;
7593
7594	retval = 0;
7595
7596	out:
7597	return retval;
7598	}
7599
7600	static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7601	char __user *optval,
7602	int __user *optlen)
7603	{
7604	struct sctp_assoc_value params;
7605	struct sctp_association *asoc;
7606	int retval = -EFAULT;
7607
7608	if (len < sizeof(params)) {
7609	retval = -EINVAL;
7610	goto out;
7611	}
7612
7613	len = sizeof(params);
7614	if (copy_from_user(to: &params, from: optval, n: len))
7615	goto out;
7616
7617	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7618	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7619	sctp_style(sk, UDP)) {
7620	retval = -EINVAL;
7621	goto out;
7622	}
7623
7624	params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7625	: sctp_sk(sk)->default_ss;
7626
7627	if (put_user(len, optlen))
7628	goto out;
7629
7630	if (copy_to_user(to: optval, from: &params, n: len))
7631	goto out;
7632
7633	retval = 0;
7634
7635	out:
7636	return retval;
7637	}
7638
7639	static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7640	char __user *optval,
7641	int __user *optlen)
7642	{
7643	struct sctp_stream_value params;
7644	struct sctp_association *asoc;
7645	int retval = -EFAULT;
7646
7647	if (len < sizeof(params)) {
7648	retval = -EINVAL;
7649	goto out;
7650	}
7651
7652	len = sizeof(params);
7653	if (copy_from_user(to: &params, from: optval, n: len))
7654	goto out;
7655
7656	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7657	if (!asoc) {
7658	retval = -EINVAL;
7659	goto out;
7660	}
7661
7662	retval = sctp_sched_get_value(asoc, sid: params.stream_id,
7663	value: &params.stream_value);
7664	if (retval)
7665	goto out;
7666
7667	if (put_user(len, optlen)) {
7668	retval = -EFAULT;
7669	goto out;
7670	}
7671
7672	if (copy_to_user(to: optval, from: &params, n: len)) {
7673	retval = -EFAULT;
7674	goto out;
7675	}
7676
7677	out:
7678	return retval;
7679	}
7680
7681	static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7682	char __user *optval,
7683	int __user *optlen)
7684	{
7685	struct sctp_assoc_value params;
7686	struct sctp_association *asoc;
7687	int retval = -EFAULT;
7688
7689	if (len < sizeof(params)) {
7690	retval = -EINVAL;
7691	goto out;
7692	}
7693
7694	len = sizeof(params);
7695	if (copy_from_user(to: &params, from: optval, n: len))
7696	goto out;
7697
7698	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7699	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7700	sctp_style(sk, UDP)) {
7701	retval = -EINVAL;
7702	goto out;
7703	}
7704
7705	params.assoc_value = asoc ? asoc->peer.intl_capable
7706	: sctp_sk(sk)->ep->intl_enable;
7707
7708	if (put_user(len, optlen))
7709	goto out;
7710
7711	if (copy_to_user(to: optval, from: &params, n: len))
7712	goto out;
7713
7714	retval = 0;
7715
7716	out:
7717	return retval;
7718	}
7719
7720	static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7721	char __user *optval,
7722	int __user *optlen)
7723	{
7724	int val;
7725
7726	if (len < sizeof(int))
7727	return -EINVAL;
7728
7729	len = sizeof(int);
7730	val = sctp_sk(sk)->reuse;
7731	if (put_user(len, optlen))
7732	return -EFAULT;
7733
7734	if (copy_to_user(to: optval, from: &val, n: len))
7735	return -EFAULT;
7736
7737	return 0;
7738	}
7739
7740	static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7741	int __user *optlen)
7742	{
7743	struct sctp_association *asoc;
7744	struct sctp_event param;
7745	__u16 subscribe;
7746
7747	if (len < sizeof(param))
7748	return -EINVAL;
7749
7750	len = sizeof(param);
7751	if (copy_from_user(to: &param, from: optval, n: len))
7752	return -EFAULT;
7753
7754	if (param.se_type < SCTP_SN_TYPE_BASE ||
7755	param.se_type > SCTP_SN_TYPE_MAX)
7756	return -EINVAL;
7757
7758	asoc = sctp_id2assoc(sk, id: param.se_assoc_id);
7759	if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7760	sctp_style(sk, UDP))
7761	return -EINVAL;
7762
7763	subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7764	param.se_on = sctp_ulpevent_type_enabled(subscribe, sn_type: param.se_type);
7765
7766	if (put_user(len, optlen))
7767	return -EFAULT;
7768
7769	if (copy_to_user(to: optval, from: &param, n: len))
7770	return -EFAULT;
7771
7772	return 0;
7773	}
7774
7775	static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7776	char __user *optval,
7777	int __user *optlen)
7778	{
7779	struct sctp_assoc_value params;
7780	struct sctp_association *asoc;
7781	int retval = -EFAULT;
7782
7783	if (len < sizeof(params)) {
7784	retval = -EINVAL;
7785	goto out;
7786	}
7787
7788	len = sizeof(params);
7789	if (copy_from_user(to: &params, from: optval, n: len))
7790	goto out;
7791
7792	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7793	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7794	sctp_style(sk, UDP)) {
7795	retval = -EINVAL;
7796	goto out;
7797	}
7798
7799	params.assoc_value = asoc ? asoc->peer.asconf_capable
7800	: sctp_sk(sk)->ep->asconf_enable;
7801
7802	if (put_user(len, optlen))
7803	goto out;
7804
7805	if (copy_to_user(to: optval, from: &params, n: len))
7806	goto out;
7807
7808	retval = 0;
7809
7810	out:
7811	return retval;
7812	}
7813
7814	static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7815	char __user *optval,
7816	int __user *optlen)
7817	{
7818	struct sctp_assoc_value params;
7819	struct sctp_association *asoc;
7820	int retval = -EFAULT;
7821
7822	if (len < sizeof(params)) {
7823	retval = -EINVAL;
7824	goto out;
7825	}
7826
7827	len = sizeof(params);
7828	if (copy_from_user(to: &params, from: optval, n: len))
7829	goto out;
7830
7831	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7832	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7833	sctp_style(sk, UDP)) {
7834	retval = -EINVAL;
7835	goto out;
7836	}
7837
7838	params.assoc_value = asoc ? asoc->peer.auth_capable
7839	: sctp_sk(sk)->ep->auth_enable;
7840
7841	if (put_user(len, optlen))
7842	goto out;
7843
7844	if (copy_to_user(to: optval, from: &params, n: len))
7845	goto out;
7846
7847	retval = 0;
7848
7849	out:
7850	return retval;
7851	}
7852
7853	static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7854	char __user *optval,
7855	int __user *optlen)
7856	{
7857	struct sctp_assoc_value params;
7858	struct sctp_association *asoc;
7859	int retval = -EFAULT;
7860
7861	if (len < sizeof(params)) {
7862	retval = -EINVAL;
7863	goto out;
7864	}
7865
7866	len = sizeof(params);
7867	if (copy_from_user(to: &params, from: optval, n: len))
7868	goto out;
7869
7870	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7871	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7872	sctp_style(sk, UDP)) {
7873	retval = -EINVAL;
7874	goto out;
7875	}
7876
7877	params.assoc_value = asoc ? asoc->peer.ecn_capable
7878	: sctp_sk(sk)->ep->ecn_enable;
7879
7880	if (put_user(len, optlen))
7881	goto out;
7882
7883	if (copy_to_user(to: optval, from: &params, n: len))
7884	goto out;
7885
7886	retval = 0;
7887
7888	out:
7889	return retval;
7890	}
7891
7892	static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7893	char __user *optval,
7894	int __user *optlen)
7895	{
7896	struct sctp_assoc_value params;
7897	struct sctp_association *asoc;
7898	int retval = -EFAULT;
7899
7900	if (len < sizeof(params)) {
7901	retval = -EINVAL;
7902	goto out;
7903	}
7904
7905	len = sizeof(params);
7906	if (copy_from_user(to: &params, from: optval, n: len))
7907	goto out;
7908
7909	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7910	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7911	sctp_style(sk, UDP)) {
7912	retval = -EINVAL;
7913	goto out;
7914	}
7915
7916	params.assoc_value = asoc ? asoc->pf_expose
7917	: sctp_sk(sk)->pf_expose;
7918
7919	if (put_user(len, optlen))
7920	goto out;
7921
7922	if (copy_to_user(to: optval, from: &params, n: len))
7923	goto out;
7924
7925	retval = 0;
7926
7927	out:
7928	return retval;
7929	}
7930
7931	static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7932	char __user *optval, int __user *optlen)
7933	{
7934	struct sctp_association *asoc;
7935	struct sctp_udpencaps encap;
7936	struct sctp_transport *t;
7937	__be16 encap_port;
7938
7939	if (len < sizeof(encap))
7940	return -EINVAL;
7941
7942	len = sizeof(encap);
7943	if (copy_from_user(to: &encap, from: optval, n: len))
7944	return -EFAULT;
7945
7946	/* If an address other than INADDR_ANY is specified, and
7947	* no transport is found, then the request is invalid.
7948	*/
7949	if (!sctp_is_any(sk, addr: (union sctp_addr *)&encap.sue_address)) {
7950	t = sctp_addr_id2transport(sk, addr: &encap.sue_address,
7951	id: encap.sue_assoc_id);
7952	if (!t) {
7953	pr_debug("%s: failed no transport\n", __func__);
7954	return -EINVAL;
7955	}
7956
7957	encap_port = t->encap_port;
7958	goto out;
7959	}
7960
7961	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7962	* socket is a one to many style socket, and an association
7963	* was not found, then the id was invalid.
7964	*/
7965	asoc = sctp_id2assoc(sk, id: encap.sue_assoc_id);
7966	if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7967	sctp_style(sk, UDP)) {
7968	pr_debug("%s: failed no association\n", __func__);
7969	return -EINVAL;
7970	}
7971
7972	if (asoc) {
7973	encap_port = asoc->encap_port;
7974	goto out;
7975	}
7976
7977	encap_port = sctp_sk(sk)->encap_port;
7978
7979	out:
7980	encap.sue_port = (__force uint16_t)encap_port;
7981	if (copy_to_user(to: optval, from: &encap, n: len))
7982	return -EFAULT;
7983
7984	if (put_user(len, optlen))
7985	return -EFAULT;
7986
7987	return 0;
7988	}
7989
7990	static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
7991	char __user *optval,
7992	int __user *optlen)
7993	{
7994	struct sctp_probeinterval params;
7995	struct sctp_association *asoc;
7996	struct sctp_transport *t;
7997	__u32 probe_interval;
7998
7999	if (len < sizeof(params))
8000	return -EINVAL;
8001
8002	len = sizeof(params);
8003	if (copy_from_user(to: &params, from: optval, n: len))
8004	return -EFAULT;
8005
8006	/* If an address other than INADDR_ANY is specified, and
8007	* no transport is found, then the request is invalid.
8008	*/
8009	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params.spi_address)) {
8010	t = sctp_addr_id2transport(sk, addr: &params.spi_address,
8011	id: params.spi_assoc_id);
8012	if (!t) {
8013	pr_debug("%s: failed no transport\n", __func__);
8014	return -EINVAL;
8015	}
8016
8017	probe_interval = jiffies_to_msecs(j: t->probe_interval);
8018	goto out;
8019	}
8020
8021	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
8022	* socket is a one to many style socket, and an association
8023	* was not found, then the id was invalid.
8024	*/
8025	asoc = sctp_id2assoc(sk, id: params.spi_assoc_id);
8026	if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
8027	sctp_style(sk, UDP)) {
8028	pr_debug("%s: failed no association\n", __func__);
8029	return -EINVAL;
8030	}
8031
8032	if (asoc) {
8033	probe_interval = jiffies_to_msecs(j: asoc->probe_interval);
8034	goto out;
8035	}
8036
8037	probe_interval = sctp_sk(sk)->probe_interval;
8038
8039	out:
8040	params.spi_interval = probe_interval;
8041	if (copy_to_user(to: optval, from: &params, n: len))
8042	return -EFAULT;
8043
8044	if (put_user(len, optlen))
8045	return -EFAULT;
8046
8047	return 0;
8048	}
8049
8050	static int sctp_getsockopt(struct sock *sk, int level, int optname,
8051	char __user *optval, int __user *optlen)
8052	{
8053	int retval = 0;
8054	int len;
8055
8056	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8057
8058	/* I can hardly begin to describe how wrong this is. This is
8059	* so broken as to be worse than useless. The API draft
8060	* REALLY is NOT helpful here... I am not convinced that the
8061	* semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8062	* are at all well-founded.
8063	*/
8064	if (level != SOL_SCTP) {
8065	struct sctp_af *af = sctp_sk(sk)->pf->af;
8066
8067	retval = af->getsockopt(sk, level, optname, optval, optlen);
8068	return retval;
8069	}
8070
8071	if (get_user(len, optlen))
8072	return -EFAULT;
8073
8074	if (len < 0)
8075	return -EINVAL;
8076
8077	lock_sock(sk);
8078
8079	switch (optname) {
8080	case SCTP_STATUS:
8081	retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8082	break;
8083	case SCTP_DISABLE_FRAGMENTS:
8084	retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8085	optlen);
8086	break;
8087	case SCTP_EVENTS:
8088	retval = sctp_getsockopt_events(sk, len, optval, optlen);
8089	break;
8090	case SCTP_AUTOCLOSE:
8091	retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8092	break;
8093	case SCTP_SOCKOPT_PEELOFF:
8094	retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8095	break;
8096	case SCTP_SOCKOPT_PEELOFF_FLAGS:
8097	retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8098	break;
8099	case SCTP_PEER_ADDR_PARAMS:
8100	retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8101	optlen);
8102	break;
8103	case SCTP_DELAYED_SACK:
8104	retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8105	optlen);
8106	break;
8107	case SCTP_INITMSG:
8108	retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8109	break;
8110	case SCTP_GET_PEER_ADDRS:
8111	retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8112	optlen);
8113	break;
8114	case SCTP_GET_LOCAL_ADDRS:
8115	retval = sctp_getsockopt_local_addrs(sk, len, optval,
8116	optlen);
8117	break;
8118	case SCTP_SOCKOPT_CONNECTX3:
8119	retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8120	break;
8121	case SCTP_DEFAULT_SEND_PARAM:
8122	retval = sctp_getsockopt_default_send_param(sk, len,
8123	optval, optlen);
8124	break;
8125	case SCTP_DEFAULT_SNDINFO:
8126	retval = sctp_getsockopt_default_sndinfo(sk, len,
8127	optval, optlen);
8128	break;
8129	case SCTP_PRIMARY_ADDR:
8130	retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8131	break;
8132	case SCTP_NODELAY:
8133	retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8134	break;
8135	case SCTP_RTOINFO:
8136	retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8137	break;
8138	case SCTP_ASSOCINFO:
8139	retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8140	break;
8141	case SCTP_I_WANT_MAPPED_V4_ADDR:
8142	retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8143	break;
8144	case SCTP_MAXSEG:
8145	retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8146	break;
8147	case SCTP_GET_PEER_ADDR_INFO:
8148	retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8149	optlen);
8150	break;
8151	case SCTP_ADAPTATION_LAYER:
8152	retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8153	optlen);
8154	break;
8155	case SCTP_CONTEXT:
8156	retval = sctp_getsockopt_context(sk, len, optval, optlen);
8157	break;
8158	case SCTP_FRAGMENT_INTERLEAVE:
8159	retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8160	optlen);
8161	break;
8162	case SCTP_PARTIAL_DELIVERY_POINT:
8163	retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8164	optlen);
8165	break;
8166	case SCTP_MAX_BURST:
8167	retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8168	break;
8169	case SCTP_AUTH_KEY:
8170	case SCTP_AUTH_CHUNK:
8171	case SCTP_AUTH_DELETE_KEY:
8172	case SCTP_AUTH_DEACTIVATE_KEY:
8173	retval = -EOPNOTSUPP;
8174	break;
8175	case SCTP_HMAC_IDENT:
8176	retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8177	break;
8178	case SCTP_AUTH_ACTIVE_KEY:
8179	retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8180	break;
8181	case SCTP_PEER_AUTH_CHUNKS:
8182	retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8183	optlen);
8184	break;
8185	case SCTP_LOCAL_AUTH_CHUNKS:
8186	retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8187	optlen);
8188	break;
8189	case SCTP_GET_ASSOC_NUMBER:
8190	retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8191	break;
8192	case SCTP_GET_ASSOC_ID_LIST:
8193	retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8194	break;
8195	case SCTP_AUTO_ASCONF:
8196	retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8197	break;
8198	case SCTP_PEER_ADDR_THLDS:
8199	retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8200	optlen, v2: false);
8201	break;
8202	case SCTP_PEER_ADDR_THLDS_V2:
8203	retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8204	optlen, v2: true);
8205	break;
8206	case SCTP_GET_ASSOC_STATS:
8207	retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8208	break;
8209	case SCTP_RECVRCVINFO:
8210	retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8211	break;
8212	case SCTP_RECVNXTINFO:
8213	retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8214	break;
8215	case SCTP_PR_SUPPORTED:
8216	retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8217	break;
8218	case SCTP_DEFAULT_PRINFO:
8219	retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8220	optlen);
8221	break;
8222	case SCTP_PR_ASSOC_STATUS:
8223	retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8224	optlen);
8225	break;
8226	case SCTP_PR_STREAM_STATUS:
8227	retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8228	optlen);
8229	break;
8230	case SCTP_RECONFIG_SUPPORTED:
8231	retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8232	optlen);
8233	break;
8234	case SCTP_ENABLE_STREAM_RESET:
8235	retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8236	optlen);
8237	break;
8238	case SCTP_STREAM_SCHEDULER:
8239	retval = sctp_getsockopt_scheduler(sk, len, optval,
8240	optlen);
8241	break;
8242	case SCTP_STREAM_SCHEDULER_VALUE:
8243	retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8244	optlen);
8245	break;
8246	case SCTP_INTERLEAVING_SUPPORTED:
8247	retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8248	optlen);
8249	break;
8250	case SCTP_REUSE_PORT:
8251	retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8252	break;
8253	case SCTP_EVENT:
8254	retval = sctp_getsockopt_event(sk, len, optval, optlen);
8255	break;
8256	case SCTP_ASCONF_SUPPORTED:
8257	retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8258	optlen);
8259	break;
8260	case SCTP_AUTH_SUPPORTED:
8261	retval = sctp_getsockopt_auth_supported(sk, len, optval,
8262	optlen);
8263	break;
8264	case SCTP_ECN_SUPPORTED:
8265	retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8266	break;
8267	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8268	retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8269	break;
8270	case SCTP_REMOTE_UDP_ENCAPS_PORT:
8271	retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8272	break;
8273	case SCTP_PLPMTUD_PROBE_INTERVAL:
8274	retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
8275	break;
8276	default:
8277	retval = -ENOPROTOOPT;
8278	break;
8279	}
8280
8281	release_sock(sk);
8282	return retval;
8283	}
8284
8285	static bool sctp_bpf_bypass_getsockopt(int level, int optname)
8286	{
8287	if (level == SOL_SCTP) {
8288	switch (optname) {
8289	case SCTP_SOCKOPT_PEELOFF:
8290	case SCTP_SOCKOPT_PEELOFF_FLAGS:
8291	case SCTP_SOCKOPT_CONNECTX3:
8292	return true;
8293	default:
8294	return false;
8295	}
8296	}
8297
8298	return false;
8299	}
8300
8301	static int sctp_hash(struct sock *sk)
8302	{
8303	/* STUB */
8304	return 0;
8305	}
8306
8307	static void sctp_unhash(struct sock *sk)
8308	{
8309	/* STUB */
8310	}
8311
8312	/* Check if port is acceptable. Possibly find first available port.
8313	*
8314	* The port hash table (contained in the 'global' SCTP protocol storage
8315	* returned by struct sctp_protocol *sctp_get_protocol()). The hash
8316	* table is an array of 4096 lists (sctp_bind_hashbucket). Each
8317	* list (the list number is the port number hashed out, so as you
8318	* would expect from a hash function, all the ports in a given list have
8319	* such a number that hashes out to the same list number; you were
8320	* expecting that, right?); so each list has a set of ports, with a
8321	* link to the socket (struct sock) that uses it, the port number and
8322	* a fastreuse flag (FIXME: NPI ipg).
8323	*/
8324	static struct sctp_bind_bucket *sctp_bucket_create(
8325	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8326
8327	static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8328	{
8329	struct sctp_sock *sp = sctp_sk(sk);
8330	bool reuse = (sk->sk_reuse || sp->reuse);
8331	struct sctp_bind_hashbucket *head; /* hash list */
8332	struct net *net = sock_net(sk);
8333	kuid_t uid = sock_i_uid(sk);
8334	struct sctp_bind_bucket *pp;
8335	unsigned short snum;
8336	int ret;
8337
8338	snum = ntohs(addr->v4.sin_port);
8339
8340	pr_debug("%s: begins, snum:%d\n", __func__, snum);
8341
8342	if (snum == 0) {
8343	/* Search for an available port. */
8344	int low, high, remaining, index;
8345	unsigned int rover;
8346
8347	inet_sk_get_local_port_range(sk, low: &low, high: &high);
8348	remaining = (high - low) + 1;
8349	rover = get_random_u32_below(ceil: remaining) + low;
8350
8351	do {
8352	rover++;
8353	if ((rover < low) || (rover > high))
8354	rover = low;
8355	if (inet_is_local_reserved_port(net, port: rover))
8356	continue;
8357	index = sctp_phashfn(net, lport: rover);
8358	head = &sctp_port_hashtable[index];
8359	spin_lock_bh(lock: &head->lock);
8360	sctp_for_each_hentry(pp, &head->chain)
8361	if ((pp->port == rover) &&
8362	net_eq(net1: net, net2: pp->net))
8363	goto next;
8364	break;
8365	next:
8366	spin_unlock_bh(lock: &head->lock);
8367	cond_resched();
8368	} while (--remaining > 0);
8369
8370	/* Exhausted local port range during search? */
8371	ret = 1;
8372	if (remaining <= 0)
8373	return ret;
8374
8375	/* OK, here is the one we will use. HEAD (the port
8376	* hash table list entry) is non-NULL and we hold it's
8377	* mutex.
8378	*/
8379	snum = rover;
8380	} else {
8381	/* We are given an specific port number; we verify
8382	* that it is not being used. If it is used, we will
8383	* exahust the search in the hash list corresponding
8384	* to the port number (snum) - we detect that with the
8385	* port iterator, pp being NULL.
8386	*/
8387	head = &sctp_port_hashtable[sctp_phashfn(net, lport: snum)];
8388	spin_lock_bh(lock: &head->lock);
8389	sctp_for_each_hentry(pp, &head->chain) {
8390	if ((pp->port == snum) && net_eq(net1: pp->net, net2: net))
8391	goto pp_found;
8392	}
8393	}
8394	pp = NULL;
8395	goto pp_not_found;
8396	pp_found:
8397	if (!hlist_empty(h: &pp->owner)) {
8398	/* We had a port hash table hit - there is an
8399	* available port (pp != NULL) and it is being
8400	* used by other socket (pp->owner not empty); that other
8401	* socket is going to be sk2.
8402	*/
8403	struct sock *sk2;
8404
8405	pr_debug("%s: found a possible match\n", __func__);
8406
8407	if ((pp->fastreuse && reuse &&
8408	sk->sk_state != SCTP_SS_LISTENING) ||
8409	(pp->fastreuseport && sk->sk_reuseport &&
8410	uid_eq(left: pp->fastuid, right: uid)))
8411	goto success;
8412
8413	/* Run through the list of sockets bound to the port
8414	* (pp->port) [via the pointers bind_next and
8415	* bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8416	* we get the endpoint they describe and run through
8417	* the endpoint's list of IP (v4 or v6) addresses,
8418	* comparing each of the addresses with the address of
8419	* the socket sk. If we find a match, then that means
8420	* that this port/socket (sk) combination are already
8421	* in an endpoint.
8422	*/
8423	sk_for_each_bound(sk2, &pp->owner) {
8424	int bound_dev_if2 = READ_ONCE(sk2->sk_bound_dev_if);
8425	struct sctp_sock *sp2 = sctp_sk(sk: sk2);
8426	struct sctp_endpoint *ep2 = sp2->ep;
8427
8428	if (sk == sk2 ||
8429	(reuse && (sk2->sk_reuse || sp2->reuse) &&
8430	sk2->sk_state != SCTP_SS_LISTENING) ||
8431	(sk->sk_reuseport && sk2->sk_reuseport &&
8432	uid_eq(left: uid, right: sock_i_uid(sk: sk2))))
8433	continue;
8434
8435	if ((!sk->sk_bound_dev_if || !bound_dev_if2 ||
8436	sk->sk_bound_dev_if == bound_dev_if2) &&
8437	sctp_bind_addr_conflict(&ep2->base.bind_addr,
8438	addr, sp2, sp)) {
8439	ret = 1;
8440	goto fail_unlock;
8441	}
8442	}
8443
8444	pr_debug("%s: found a match\n", __func__);
8445	}
8446	pp_not_found:
8447	/* If there was a hash table miss, create a new port. */
8448	ret = 1;
8449	if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8450	goto fail_unlock;
8451
8452	/* In either case (hit or miss), make sure fastreuse is 1 only
8453	* if sk->sk_reuse is too (that is, if the caller requested
8454	* SO_REUSEADDR on this socket -sk-).
8455	*/
8456	if (hlist_empty(h: &pp->owner)) {
8457	if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8458	pp->fastreuse = 1;
8459	else
8460	pp->fastreuse = 0;
8461
8462	if (sk->sk_reuseport) {
8463	pp->fastreuseport = 1;
8464	pp->fastuid = uid;
8465	} else {
8466	pp->fastreuseport = 0;
8467	}
8468	} else {
8469	if (pp->fastreuse &&
8470	(!reuse || sk->sk_state == SCTP_SS_LISTENING))
8471	pp->fastreuse = 0;
8472
8473	if (pp->fastreuseport &&
8474	(!sk->sk_reuseport || !uid_eq(left: pp->fastuid, right: uid)))
8475	pp->fastreuseport = 0;
8476	}
8477
8478	/* We are set, so fill up all the data in the hash table
8479	* entry, tie the socket list information with the rest of the
8480	* sockets FIXME: Blurry, NPI (ipg).
8481	*/
8482	success:
8483	if (!sp->bind_hash) {
8484	inet_sk(sk)->inet_num = snum;
8485	sk_add_bind_node(sk, list: &pp->owner);
8486	sp->bind_hash = pp;
8487	}
8488	ret = 0;
8489
8490	fail_unlock:
8491	spin_unlock_bh(lock: &head->lock);
8492	return ret;
8493	}
8494
8495	/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8496	* port is requested.
8497	*/
8498	static int sctp_get_port(struct sock *sk, unsigned short snum)
8499	{
8500	union sctp_addr addr;
8501	struct sctp_af *af = sctp_sk(sk)->pf->af;
8502
8503	/* Set up a dummy address struct from the sk. */
8504	af->from_sk(&addr, sk);
8505	addr.v4.sin_port = htons(snum);
8506
8507	/* Note: sk->sk_num gets filled in if ephemeral port request. */
8508	return sctp_get_port_local(sk, addr: &addr);
8509	}
8510
8511	/*
8512	* Move a socket to LISTENING state.
8513	*/
8514	static int sctp_listen_start(struct sock *sk, int backlog)
8515	{
8516	struct sctp_sock *sp = sctp_sk(sk);
8517	struct sctp_endpoint *ep = sp->ep;
8518	struct crypto_shash *tfm = NULL;
8519	char alg[32];
8520
8521	/* Allocate HMAC for generating cookie. */
8522	if (!sp->hmac && sp->sctp_hmac_alg) {
8523	sprintf(buf: alg, fmt: "hmac(%s)", sp->sctp_hmac_alg);
8524	tfm = crypto_alloc_shash(alg_name: alg, type: 0, mask: 0);
8525	if (IS_ERR(ptr: tfm)) {
8526	net_info_ratelimited("failed to load transform for %s: %ld\n",
8527	sp->sctp_hmac_alg, PTR_ERR(tfm));
8528	return -ENOSYS;
8529	}
8530	sctp_sk(sk)->hmac = tfm;
8531	}
8532
8533	/*
8534	* If a bind() or sctp_bindx() is not called prior to a listen()
8535	* call that allows new associations to be accepted, the system
8536	* picks an ephemeral port and will choose an address set equivalent
8537	* to binding with a wildcard address.
8538	*
8539	* This is not currently spelled out in the SCTP sockets
8540	* extensions draft, but follows the practice as seen in TCP
8541	* sockets.
8542	*
8543	*/
8544	inet_sk_set_state(sk, state: SCTP_SS_LISTENING);
8545	if (!ep->base.bind_addr.port) {
8546	if (sctp_autobind(sk))
8547	return -EAGAIN;
8548	} else {
8549	if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8550	inet_sk_set_state(sk, state: SCTP_SS_CLOSED);
8551	return -EADDRINUSE;
8552	}
8553	}
8554
8555	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8556	return sctp_hash_endpoint(ep);
8557	}
8558
8559	/*
8560	* 4.1.3 / 5.1.3 listen()
8561	*
8562	* By default, new associations are not accepted for UDP style sockets.
8563	* An application uses listen() to mark a socket as being able to
8564	* accept new associations.
8565	*
8566	* On TCP style sockets, applications use listen() to ready the SCTP
8567	* endpoint for accepting inbound associations.
8568	*
8569	* On both types of endpoints a backlog of '0' disables listening.
8570	*
8571	* Move a socket to LISTENING state.
8572	*/
8573	int sctp_inet_listen(struct socket *sock, int backlog)
8574	{
8575	struct sock *sk = sock->sk;
8576	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8577	int err = -EINVAL;
8578
8579	if (unlikely(backlog < 0))
8580	return err;
8581
8582	lock_sock(sk);
8583
8584	/* Peeled-off sockets are not allowed to listen(). */
8585	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8586	goto out;
8587
8588	if (sock->state != SS_UNCONNECTED)
8589	goto out;
8590
8591	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8592	goto out;
8593
8594	/* If backlog is zero, disable listening. */
8595	if (!backlog) {
8596	if (sctp_sstate(sk, CLOSED))
8597	goto out;
8598
8599	err = 0;
8600	sctp_unhash_endpoint(ep);
8601	sk->sk_state = SCTP_SS_CLOSED;
8602	if (sk->sk_reuse || sctp_sk(sk)->reuse)
8603	sctp_sk(sk)->bind_hash->fastreuse = 1;
8604	goto out;
8605	}
8606
8607	/* If we are already listening, just update the backlog */
8608	if (sctp_sstate(sk, LISTENING))
8609	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8610	else {
8611	err = sctp_listen_start(sk, backlog);
8612	if (err)
8613	goto out;
8614	}
8615
8616	err = 0;
8617	out:
8618	release_sock(sk);
8619	return err;
8620	}
8621
8622	/*
8623	* This function is done by modeling the current datagram_poll() and the
8624	* tcp_poll(). Note that, based on these implementations, we don't
8625	* lock the socket in this function, even though it seems that,
8626	* ideally, locking or some other mechanisms can be used to ensure
8627	* the integrity of the counters (sndbuf and wmem_alloc) used
8628	* in this place. We assume that we don't need locks either until proven
8629	* otherwise.
8630	*
8631	* Another thing to note is that we include the Async I/O support
8632	* here, again, by modeling the current TCP/UDP code. We don't have
8633	* a good way to test with it yet.
8634	*/
8635	__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8636	{
8637	struct sock *sk = sock->sk;
8638	struct sctp_sock *sp = sctp_sk(sk);
8639	__poll_t mask;
8640
8641	poll_wait(filp: file, wait_address: sk_sleep(sk), p: wait);
8642
8643	sock_rps_record_flow(sk);
8644
8645	/* A TCP-style listening socket becomes readable when the accept queue
8646	* is not empty.
8647	*/
8648	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8649	return (!list_empty(head: &sp->ep->asocs)) ?
8650	(EPOLLIN | EPOLLRDNORM) : 0;
8651
8652	mask = 0;
8653
8654	/* Is there any exceptional events? */
8655	if (sk->sk_err || !skb_queue_empty_lockless(list: &sk->sk_error_queue))
8656	mask |= EPOLLERR |
8657	(sock_flag(sk, flag: SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8658	if (sk->sk_shutdown & RCV_SHUTDOWN)
8659	mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8660	if (sk->sk_shutdown == SHUTDOWN_MASK)
8661	mask |= EPOLLHUP;
8662
8663	/* Is it readable? Reconsider this code with TCP-style support. */
8664	if (!skb_queue_empty_lockless(list: &sk->sk_receive_queue))
8665	mask |= EPOLLIN | EPOLLRDNORM;
8666
8667	/* The association is either gone or not ready. */
8668	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8669	return mask;
8670
8671	/* Is it writable? */
8672	if (sctp_writeable(sk)) {
8673	mask |= EPOLLOUT | EPOLLWRNORM;
8674	} else {
8675	sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8676	/*
8677	* Since the socket is not locked, the buffer
8678	* might be made available after the writeable check and
8679	* before the bit is set. This could cause a lost I/O
8680	* signal. tcp_poll() has a race breaker for this race
8681	* condition. Based on their implementation, we put
8682	* in the following code to cover it as well.
8683	*/
8684	if (sctp_writeable(sk))
8685	mask |= EPOLLOUT | EPOLLWRNORM;
8686	}
8687	return mask;
8688	}
8689
8690	/********************************************************************
8691	* 2nd Level Abstractions
8692	********************************************************************/
8693
8694	static struct sctp_bind_bucket *sctp_bucket_create(
8695	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8696	{
8697	struct sctp_bind_bucket *pp;
8698
8699	pp = kmem_cache_alloc(cachep: sctp_bucket_cachep, GFP_ATOMIC);
8700	if (pp) {
8701	SCTP_DBG_OBJCNT_INC(bind_bucket);
8702	pp->port = snum;
8703	pp->fastreuse = 0;
8704	INIT_HLIST_HEAD(&pp->owner);
8705	pp->net = net;
8706	hlist_add_head(n: &pp->node, h: &head->chain);
8707	}
8708	return pp;
8709	}
8710
8711	/* Caller must hold hashbucket lock for this tb with local BH disabled */
8712	static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8713	{
8714	if (pp && hlist_empty(h: &pp->owner)) {
8715	__hlist_del(n: &pp->node);
8716	kmem_cache_free(s: sctp_bucket_cachep, objp: pp);
8717	SCTP_DBG_OBJCNT_DEC(bind_bucket);
8718	}
8719	}
8720
8721	/* Release this socket's reference to a local port. */
8722	static inline void __sctp_put_port(struct sock *sk)
8723	{
8724	struct sctp_bind_hashbucket *head =
8725	&sctp_port_hashtable[sctp_phashfn(net: sock_net(sk),
8726	inet_sk(sk)->inet_num)];
8727	struct sctp_bind_bucket *pp;
8728
8729	spin_lock(lock: &head->lock);
8730	pp = sctp_sk(sk)->bind_hash;
8731	__sk_del_bind_node(sk);
8732	sctp_sk(sk)->bind_hash = NULL;
8733	inet_sk(sk)->inet_num = 0;
8734	sctp_bucket_destroy(pp);
8735	spin_unlock(lock: &head->lock);
8736	}
8737
8738	void sctp_put_port(struct sock *sk)
8739	{
8740	local_bh_disable();
8741	__sctp_put_port(sk);
8742	local_bh_enable();
8743	}
8744
8745	/*
8746	* The system picks an ephemeral port and choose an address set equivalent
8747	* to binding with a wildcard address.
8748	* One of those addresses will be the primary address for the association.
8749	* This automatically enables the multihoming capability of SCTP.
8750	*/
8751	static int sctp_autobind(struct sock *sk)
8752	{
8753	union sctp_addr autoaddr;
8754	struct sctp_af *af;
8755	__be16 port;
8756
8757	/* Initialize a local sockaddr structure to INADDR_ANY. */
8758	af = sctp_sk(sk)->pf->af;
8759
8760	port = htons(inet_sk(sk)->inet_num);
8761	af->inaddr_any(&autoaddr, port);
8762
8763	return sctp_do_bind(sk, addr: &autoaddr, len: af->sockaddr_len);
8764	}
8765
8766	/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8767	*
8768	* From RFC 2292
8769	* 4.2 The cmsghdr Structure *
8770	*
8771	* When ancillary data is sent or received, any number of ancillary data
8772	* objects can be specified by the msg_control and msg_controllen members of
8773	* the msghdr structure, because each object is preceded by
8774	* a cmsghdr structure defining the object's length (the cmsg_len member).
8775	* Historically Berkeley-derived implementations have passed only one object
8776	* at a time, but this API allows multiple objects to be
8777	* passed in a single call to sendmsg() or recvmsg(). The following example
8778	* shows two ancillary data objects in a control buffer.
8779	*
8780	* |<--------------------------- msg_controllen -------------------------->|
8781	* | |
8782	*
8783	* |<----- ancillary data object ----->|<----- ancillary data object ----->|
8784	*
8785	* |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8786	* | | |
8787	*
8788	* |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8789	*
8790	* |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8791	* | | | | |
8792	*
8793	* +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8794	* |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8795	*
8796	* |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8797	*
8798	* +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8799	* ^
8800	* |
8801	*
8802	* msg_control
8803	* points here
8804	*/
8805	static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8806	{
8807	struct msghdr *my_msg = (struct msghdr *)msg;
8808	struct cmsghdr *cmsg;
8809
8810	for_each_cmsghdr(cmsg, my_msg) {
8811	if (!CMSG_OK(my_msg, cmsg))
8812	return -EINVAL;
8813
8814	/* Should we parse this header or ignore? */
8815	if (cmsg->cmsg_level != IPPROTO_SCTP)
8816	continue;
8817
8818	/* Strictly check lengths following example in SCM code. */
8819	switch (cmsg->cmsg_type) {
8820	case SCTP_INIT:
8821	/* SCTP Socket API Extension
8822	* 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8823	*
8824	* This cmsghdr structure provides information for
8825	* initializing new SCTP associations with sendmsg().
8826	* The SCTP_INITMSG socket option uses this same data
8827	* structure. This structure is not used for
8828	* recvmsg().
8829	*
8830	* cmsg_level cmsg_type cmsg_data[]
8831	* ------------ ------------ ----------------------
8832	* IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8833	*/
8834	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8835	return -EINVAL;
8836
8837	cmsgs->init = CMSG_DATA(cmsg);
8838	break;
8839
8840	case SCTP_SNDRCV:
8841	/* SCTP Socket API Extension
8842	* 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8843	*
8844	* This cmsghdr structure specifies SCTP options for
8845	* sendmsg() and describes SCTP header information
8846	* about a received message through recvmsg().
8847	*
8848	* cmsg_level cmsg_type cmsg_data[]
8849	* ------------ ------------ ----------------------
8850	* IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8851	*/
8852	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8853	return -EINVAL;
8854
8855	cmsgs->srinfo = CMSG_DATA(cmsg);
8856
8857	if (cmsgs->srinfo->sinfo_flags &
8858	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8859	SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8860	SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8861	return -EINVAL;
8862	break;
8863
8864	case SCTP_SNDINFO:
8865	/* SCTP Socket API Extension
8866	* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8867	*
8868	* This cmsghdr structure specifies SCTP options for
8869	* sendmsg(). This structure and SCTP_RCVINFO replaces
8870	* SCTP_SNDRCV which has been deprecated.
8871	*
8872	* cmsg_level cmsg_type cmsg_data[]
8873	* ------------ ------------ ---------------------
8874	* IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8875	*/
8876	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8877	return -EINVAL;
8878
8879	cmsgs->sinfo = CMSG_DATA(cmsg);
8880
8881	if (cmsgs->sinfo->snd_flags &
8882	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8883	SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8884	SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8885	return -EINVAL;
8886	break;
8887	case SCTP_PRINFO:
8888	/* SCTP Socket API Extension
8889	* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8890	*
8891	* This cmsghdr structure specifies SCTP options for sendmsg().
8892	*
8893	* cmsg_level cmsg_type cmsg_data[]
8894	* ------------ ------------ ---------------------
8895	* IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8896	*/
8897	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8898	return -EINVAL;
8899
8900	cmsgs->prinfo = CMSG_DATA(cmsg);
8901	if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8902	return -EINVAL;
8903
8904	if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8905	cmsgs->prinfo->pr_value = 0;
8906	break;
8907	case SCTP_AUTHINFO:
8908	/* SCTP Socket API Extension
8909	* 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8910	*
8911	* This cmsghdr structure specifies SCTP options for sendmsg().
8912	*
8913	* cmsg_level cmsg_type cmsg_data[]
8914	* ------------ ------------ ---------------------
8915	* IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8916	*/
8917	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8918	return -EINVAL;
8919
8920	cmsgs->authinfo = CMSG_DATA(cmsg);
8921	break;
8922	case SCTP_DSTADDRV4:
8923	case SCTP_DSTADDRV6:
8924	/* SCTP Socket API Extension
8925	* 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8926	*
8927	* This cmsghdr structure specifies SCTP options for sendmsg().
8928	*
8929	* cmsg_level cmsg_type cmsg_data[]
8930	* ------------ ------------ ---------------------
8931	* IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8932	* ------------ ------------ ---------------------
8933	* IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8934	*/
8935	cmsgs->addrs_msg = my_msg;
8936	break;
8937	default:
8938	return -EINVAL;
8939	}
8940	}
8941
8942	return 0;
8943	}
8944
8945	/*
8946	* Wait for a packet..
8947	* Note: This function is the same function as in core/datagram.c
8948	* with a few modifications to make lksctp work.
8949	*/
8950	static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8951	{
8952	int error;
8953	DEFINE_WAIT(wait);
8954
8955	prepare_to_wait_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait, TASK_INTERRUPTIBLE);
8956
8957	/* Socket errors? */
8958	error = sock_error(sk);
8959	if (error)
8960	goto out;
8961
8962	if (!skb_queue_empty(list: &sk->sk_receive_queue))
8963	goto ready;
8964
8965	/* Socket shut down? */
8966	if (sk->sk_shutdown & RCV_SHUTDOWN)
8967	goto out;
8968
8969	/* Sequenced packets can come disconnected. If so we report the
8970	* problem.
8971	*/
8972	error = -ENOTCONN;
8973
8974	/* Is there a good reason to think that we may receive some data? */
8975	if (list_empty(head: &sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8976	goto out;
8977
8978	/* Handle signals. */
8979	if (signal_pending(current))
8980	goto interrupted;
8981
8982	/* Let another process have a go. Since we are going to sleep
8983	* anyway. Note: This may cause odd behaviors if the message
8984	* does not fit in the user's buffer, but this seems to be the
8985	* only way to honor MSG_DONTWAIT realistically.
8986	*/
8987	release_sock(sk);
8988	*timeo_p = schedule_timeout(timeout: *timeo_p);
8989	lock_sock(sk);
8990
8991	ready:
8992	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
8993	return 0;
8994
8995	interrupted:
8996	error = sock_intr_errno(timeo: *timeo_p);
8997
8998	out:
8999	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9000	*err = error;
9001	return error;
9002	}
9003
9004	/* Receive a datagram.
9005	* Note: This is pretty much the same routine as in core/datagram.c
9006	* with a few changes to make lksctp work.
9007	*/
9008	struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err)
9009	{
9010	int error;
9011	struct sk_buff *skb;
9012	long timeo;
9013
9014	timeo = sock_rcvtimeo(sk, noblock: flags & MSG_DONTWAIT);
9015
9016	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
9017	MAX_SCHEDULE_TIMEOUT);
9018
9019	do {
9020	/* Again only user level code calls this function,
9021	* so nothing interrupt level
9022	* will suddenly eat the receive_queue.
9023	*
9024	* Look at current nfs client by the way...
9025	* However, this function was correct in any case. 8)
9026	*/
9027	if (flags & MSG_PEEK) {
9028	skb = skb_peek(list_: &sk->sk_receive_queue);
9029	if (skb)
9030	refcount_inc(r: &skb->users);
9031	} else {
9032	skb = __skb_dequeue(list: &sk->sk_receive_queue);
9033	}
9034
9035	if (skb)
9036	return skb;
9037
9038	/* Caller is allowed not to check sk->sk_err before calling. */
9039	error = sock_error(sk);
9040	if (error)
9041	goto no_packet;
9042
9043	if (sk->sk_shutdown & RCV_SHUTDOWN)
9044	break;
9045
9046	if (sk_can_busy_loop(sk)) {
9047	sk_busy_loop(sk, nonblock: flags & MSG_DONTWAIT);
9048
9049	if (!skb_queue_empty_lockless(list: &sk->sk_receive_queue))
9050	continue;
9051	}
9052
9053	/* User doesn't want to wait. */
9054	error = -EAGAIN;
9055	if (!timeo)
9056	goto no_packet;
9057	} while (sctp_wait_for_packet(sk, err, timeo_p: &timeo) == 0);
9058
9059	return NULL;
9060
9061	no_packet:
9062	*err = error;
9063	return NULL;
9064	}
9065
9066	/* If sndbuf has changed, wake up per association sndbuf waiters. */
9067	static void __sctp_write_space(struct sctp_association *asoc)
9068	{
9069	struct sock *sk = asoc->base.sk;
9070
9071	if (sctp_wspace(asoc) <= 0)
9072	return;
9073
9074	if (waitqueue_active(wq_head: &asoc->wait))
9075	wake_up_interruptible(&asoc->wait);
9076
9077	if (sctp_writeable(sk)) {
9078	struct socket_wq *wq;
9079
9080	rcu_read_lock();
9081	wq = rcu_dereference(sk->sk_wq);
9082	if (wq) {
9083	if (waitqueue_active(wq_head: &wq->wait))
9084	wake_up_interruptible(&wq->wait);
9085
9086	/* Note that we try to include the Async I/O support
9087	* here by modeling from the current TCP/UDP code.
9088	* We have not tested with it yet.
9089	*/
9090	if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9091	sock_wake_async(sk_wq: wq, how: SOCK_WAKE_SPACE, POLL_OUT);
9092	}
9093	rcu_read_unlock();
9094	}
9095	}
9096
9097	static void sctp_wake_up_waiters(struct sock *sk,
9098	struct sctp_association *asoc)
9099	{
9100	struct sctp_association *tmp = asoc;
9101
9102	/* We do accounting for the sndbuf space per association,
9103	* so we only need to wake our own association.
9104	*/
9105	if (asoc->ep->sndbuf_policy)
9106	return __sctp_write_space(asoc);
9107
9108	/* If association goes down and is just flushing its
9109	* outq, then just normally notify others.
9110	*/
9111	if (asoc->base.dead)
9112	return sctp_write_space(sk);
9113
9114	/* Accounting for the sndbuf space is per socket, so we
9115	* need to wake up others, try to be fair and in case of
9116	* other associations, let them have a go first instead
9117	* of just doing a sctp_write_space() call.
9118	*
9119	* Note that we reach sctp_wake_up_waiters() only when
9120	* associations free up queued chunks, thus we are under
9121	* lock and the list of associations on a socket is
9122	* guaranteed not to change.
9123	*/
9124	for (tmp = list_next_entry(tmp, asocs); 1;
9125	tmp = list_next_entry(tmp, asocs)) {
9126	/* Manually skip the head element. */
9127	if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9128	continue;
9129	/* Wake up association. */
9130	__sctp_write_space(asoc: tmp);
9131	/* We've reached the end. */
9132	if (tmp == asoc)
9133	break;
9134	}
9135	}
9136
9137	/* Do accounting for the sndbuf space.
9138	* Decrement the used sndbuf space of the corresponding association by the
9139	* data size which was just transmitted(freed).
9140	*/
9141	static void sctp_wfree(struct sk_buff *skb)
9142	{
9143	struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9144	struct sctp_association *asoc = chunk->asoc;
9145	struct sock *sk = asoc->base.sk;
9146
9147	sk_mem_uncharge(sk, size: skb->truesize);
9148	sk_wmem_queued_add(sk, val: -(skb->truesize + sizeof(struct sctp_chunk)));
9149	asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9150	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9151	&sk->sk_wmem_alloc));
9152
9153	if (chunk->shkey) {
9154	struct sctp_shared_key *shkey = chunk->shkey;
9155
9156	/* refcnt == 2 and !list_empty mean after this release, it's
9157	* not being used anywhere, and it's time to notify userland
9158	* that this shkey can be freed if it's been deactivated.
9159	*/
9160	if (shkey->deactivated && !list_empty(head: &shkey->key_list) &&
9161	refcount_read(r: &shkey->refcnt) == 2) {
9162	struct sctp_ulpevent *ev;
9163
9164	ev = sctp_ulpevent_make_authkey(asoc, key_id: shkey->key_id,
9165	indication: SCTP_AUTH_FREE_KEY,
9166	GFP_KERNEL);
9167	if (ev)
9168	asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9169	}
9170	sctp_auth_shkey_release(sh_key: chunk->shkey);
9171	}
9172
9173	sock_wfree(skb);
9174	sctp_wake_up_waiters(sk, asoc);
9175
9176	sctp_association_put(asoc);
9177	}
9178
9179	/* Do accounting for the receive space on the socket.
9180	* Accounting for the association is done in ulpevent.c
9181	* We set this as a destructor for the cloned data skbs so that
9182	* accounting is done at the correct time.
9183	*/
9184	void sctp_sock_rfree(struct sk_buff *skb)
9185	{
9186	struct sock *sk = skb->sk;
9187	struct sctp_ulpevent *event = sctp_skb2event(skb);
9188
9189	atomic_sub(i: event->rmem_len, v: &sk->sk_rmem_alloc);
9190
9191	/*
9192	* Mimic the behavior of sock_rfree
9193	*/
9194	sk_mem_uncharge(sk, size: event->rmem_len);
9195	}
9196
9197
9198	/* Helper function to wait for space in the sndbuf. */
9199	static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9200	size_t msg_len)
9201	{
9202	struct sock *sk = asoc->base.sk;
9203	long current_timeo = *timeo_p;
9204	DEFINE_WAIT(wait);
9205	int err = 0;
9206
9207	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9208	*timeo_p, msg_len);
9209
9210	/* Increment the association's refcnt. */
9211	sctp_association_hold(asoc);
9212
9213	/* Wait on the association specific sndbuf space. */
9214	for (;;) {
9215	prepare_to_wait_exclusive(wq_head: &asoc->wait, wq_entry: &wait,
9216	TASK_INTERRUPTIBLE);
9217	if (asoc->base.dead)
9218	goto do_dead;
9219	if (!*timeo_p)
9220	goto do_nonblock;
9221	if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9222	goto do_error;
9223	if (signal_pending(current))
9224	goto do_interrupted;
9225	if ((int)msg_len <= sctp_wspace(asoc) &&
9226	sk_wmem_schedule(sk, size: msg_len))
9227	break;
9228
9229	/* Let another process have a go. Since we are going
9230	* to sleep anyway.
9231	*/
9232	release_sock(sk);
9233	current_timeo = schedule_timeout(timeout: current_timeo);
9234	lock_sock(sk);
9235	if (sk != asoc->base.sk)
9236	goto do_error;
9237
9238	*timeo_p = current_timeo;
9239	}
9240
9241	out:
9242	finish_wait(wq_head: &asoc->wait, wq_entry: &wait);
9243
9244	/* Release the association's refcnt. */
9245	sctp_association_put(asoc);
9246
9247	return err;
9248
9249	do_dead:
9250	err = -ESRCH;
9251	goto out;
9252
9253	do_error:
9254	err = -EPIPE;
9255	goto out;
9256
9257	do_interrupted:
9258	err = sock_intr_errno(timeo: *timeo_p);
9259	goto out;
9260
9261	do_nonblock:
9262	err = -EAGAIN;
9263	goto out;
9264	}
9265
9266	void sctp_data_ready(struct sock *sk)
9267	{
9268	struct socket_wq *wq;
9269
9270	trace_sk_data_ready(sk);
9271
9272	rcu_read_lock();
9273	wq = rcu_dereference(sk->sk_wq);
9274	if (skwq_has_sleeper(wq))
9275	wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9276	EPOLLRDNORM | EPOLLRDBAND);
9277	sk_wake_async(sk, how: SOCK_WAKE_WAITD, POLL_IN);
9278	rcu_read_unlock();
9279	}
9280
9281	/* If socket sndbuf has changed, wake up all per association waiters. */
9282	void sctp_write_space(struct sock *sk)
9283	{
9284	struct sctp_association *asoc;
9285
9286	/* Wake up the tasks in each wait queue. */
9287	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9288	__sctp_write_space(asoc);
9289	}
9290	}
9291
9292	/* Is there any sndbuf space available on the socket?
9293	*
9294	* Note that sk_wmem_alloc is the sum of the send buffers on all of the
9295	* associations on the same socket. For a UDP-style socket with
9296	* multiple associations, it is possible for it to be "unwriteable"
9297	* prematurely. I assume that this is acceptable because
9298	* a premature "unwriteable" is better than an accidental "writeable" which
9299	* would cause an unwanted block under certain circumstances. For the 1-1
9300	* UDP-style sockets or TCP-style sockets, this code should work.
9301	* - Daisy
9302	*/
9303	static bool sctp_writeable(const struct sock *sk)
9304	{
9305	return READ_ONCE(sk->sk_sndbuf) > READ_ONCE(sk->sk_wmem_queued);
9306	}
9307
9308	/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9309	* returns immediately with EINPROGRESS.
9310	*/
9311	static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9312	{
9313	struct sock *sk = asoc->base.sk;
9314	int err = 0;
9315	long current_timeo = *timeo_p;
9316	DEFINE_WAIT(wait);
9317
9318	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9319
9320	/* Increment the association's refcnt. */
9321	sctp_association_hold(asoc);
9322
9323	for (;;) {
9324	prepare_to_wait_exclusive(wq_head: &asoc->wait, wq_entry: &wait,
9325	TASK_INTERRUPTIBLE);
9326	if (!*timeo_p)
9327	goto do_nonblock;
9328	if (sk->sk_shutdown & RCV_SHUTDOWN)
9329	break;
9330	if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9331	asoc->base.dead)
9332	goto do_error;
9333	if (signal_pending(current))
9334	goto do_interrupted;
9335
9336	if (sctp_state(asoc, ESTABLISHED))
9337	break;
9338
9339	/* Let another process have a go. Since we are going
9340	* to sleep anyway.
9341	*/
9342	release_sock(sk);
9343	current_timeo = schedule_timeout(timeout: current_timeo);
9344	lock_sock(sk);
9345
9346	*timeo_p = current_timeo;
9347	}
9348
9349	out:
9350	finish_wait(wq_head: &asoc->wait, wq_entry: &wait);
9351
9352	/* Release the association's refcnt. */
9353	sctp_association_put(asoc);
9354
9355	return err;
9356
9357	do_error:
9358	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9359	err = -ETIMEDOUT;
9360	else
9361	err = -ECONNREFUSED;
9362	goto out;
9363
9364	do_interrupted:
9365	err = sock_intr_errno(timeo: *timeo_p);
9366	goto out;
9367
9368	do_nonblock:
9369	err = -EINPROGRESS;
9370	goto out;
9371	}
9372
9373	static int sctp_wait_for_accept(struct sock *sk, long timeo)
9374	{
9375	struct sctp_endpoint *ep;
9376	int err = 0;
9377	DEFINE_WAIT(wait);
9378
9379	ep = sctp_sk(sk)->ep;
9380
9381
9382	for (;;) {
9383	prepare_to_wait_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait,
9384	TASK_INTERRUPTIBLE);
9385
9386	if (list_empty(head: &ep->asocs)) {
9387	release_sock(sk);
9388	timeo = schedule_timeout(timeout: timeo);
9389	lock_sock(sk);
9390	}
9391
9392	err = -EINVAL;
9393	if (!sctp_sstate(sk, LISTENING))
9394	break;
9395
9396	err = 0;
9397	if (!list_empty(head: &ep->asocs))
9398	break;
9399
9400	err = sock_intr_errno(timeo);
9401	if (signal_pending(current))
9402	break;
9403
9404	err = -EAGAIN;
9405	if (!timeo)
9406	break;
9407	}
9408
9409	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9410
9411	return err;
9412	}
9413
9414	static void sctp_wait_for_close(struct sock *sk, long timeout)
9415	{
9416	DEFINE_WAIT(wait);
9417
9418	do {
9419	prepare_to_wait(wq_head: sk_sleep(sk), wq_entry: &wait, TASK_INTERRUPTIBLE);
9420	if (list_empty(head: &sctp_sk(sk)->ep->asocs))
9421	break;
9422	release_sock(sk);
9423	timeout = schedule_timeout(timeout);
9424	lock_sock(sk);
9425	} while (!signal_pending(current) && timeout);
9426
9427	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9428	}
9429
9430	static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9431	{
9432	struct sk_buff *frag;
9433
9434	if (!skb->data_len)
9435	goto done;
9436
9437	/* Don't forget the fragments. */
9438	skb_walk_frags(skb, frag)
9439	sctp_skb_set_owner_r_frag(skb: frag, sk);
9440
9441	done:
9442	sctp_skb_set_owner_r(skb, sk);
9443	}
9444
9445	void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9446	struct sctp_association *asoc)
9447	{
9448	struct inet_sock *inet = inet_sk(sk);
9449	struct inet_sock *newinet;
9450	struct sctp_sock *sp = sctp_sk(sk);
9451
9452	newsk->sk_type = sk->sk_type;
9453	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9454	newsk->sk_flags = sk->sk_flags;
9455	newsk->sk_tsflags = sk->sk_tsflags;
9456	newsk->sk_no_check_tx = sk->sk_no_check_tx;
9457	newsk->sk_no_check_rx = sk->sk_no_check_rx;
9458	newsk->sk_reuse = sk->sk_reuse;
9459	sctp_sk(sk: newsk)->reuse = sp->reuse;
9460
9461	newsk->sk_shutdown = sk->sk_shutdown;
9462	newsk->sk_destruct = sk->sk_destruct;
9463	newsk->sk_family = sk->sk_family;
9464	newsk->sk_protocol = IPPROTO_SCTP;
9465	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9466	newsk->sk_sndbuf = sk->sk_sndbuf;
9467	newsk->sk_rcvbuf = sk->sk_rcvbuf;
9468	newsk->sk_lingertime = sk->sk_lingertime;
9469	newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9470	newsk->sk_sndtimeo = sk->sk_sndtimeo;
9471	newsk->sk_rxhash = sk->sk_rxhash;
9472
9473	newinet = inet_sk(newsk);
9474
9475	/* Initialize sk's sport, dport, rcv_saddr and daddr for
9476	* getsockname() and getpeername()
9477	*/
9478	newinet->inet_sport = inet->inet_sport;
9479	newinet->inet_saddr = inet->inet_saddr;
9480	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9481	newinet->inet_dport = htons(asoc->peer.port);
9482	newinet->pmtudisc = inet->pmtudisc;
9483	atomic_set(v: &newinet->inet_id, i: get_random_u16());
9484
9485	newinet->uc_ttl = inet->uc_ttl;
9486	inet_set_bit(MC_LOOP, newsk);
9487	newinet->mc_ttl = 1;
9488	newinet->mc_index = 0;
9489	newinet->mc_list = NULL;
9490
9491	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9492	net_enable_timestamp();
9493
9494	/* Set newsk security attributes from original sk and connection
9495	* security attribute from asoc.
9496	*/
9497	security_sctp_sk_clone(asoc, sk, newsk);
9498	}
9499
9500	static inline void sctp_copy_descendant(struct sock *sk_to,
9501	const struct sock *sk_from)
9502	{
9503	size_t ancestor_size = sizeof(struct inet_sock);
9504
9505	ancestor_size += sk_from->sk_prot->obj_size;
9506	ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9507	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9508	}
9509
9510	/* Populate the fields of the newsk from the oldsk and migrate the assoc
9511	* and its messages to the newsk.
9512	*/
9513	static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9514	struct sctp_association *assoc,
9515	enum sctp_socket_type type)
9516	{
9517	struct sctp_sock *oldsp = sctp_sk(sk: oldsk);
9518	struct sctp_sock *newsp = sctp_sk(sk: newsk);
9519	struct sctp_bind_bucket *pp; /* hash list port iterator */
9520	struct sctp_endpoint *newep = newsp->ep;
9521	struct sk_buff *skb, *tmp;
9522	struct sctp_ulpevent *event;
9523	struct sctp_bind_hashbucket *head;
9524	int err;
9525
9526	/* Migrate socket buffer sizes and all the socket level options to the
9527	* new socket.
9528	*/
9529	newsk->sk_sndbuf = oldsk->sk_sndbuf;
9530	newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9531	/* Brute force copy old sctp opt. */
9532	sctp_copy_descendant(sk_to: newsk, sk_from: oldsk);
9533
9534	/* Restore the ep value that was overwritten with the above structure
9535	* copy.
9536	*/
9537	newsp->ep = newep;
9538	newsp->hmac = NULL;
9539
9540	/* Hook this new socket in to the bind_hash list. */
9541	head = &sctp_port_hashtable[sctp_phashfn(net: sock_net(sk: oldsk),
9542	inet_sk(oldsk)->inet_num)];
9543	spin_lock_bh(lock: &head->lock);
9544	pp = sctp_sk(sk: oldsk)->bind_hash;
9545	sk_add_bind_node(sk: newsk, list: &pp->owner);
9546	sctp_sk(sk: newsk)->bind_hash = pp;
9547	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9548	spin_unlock_bh(lock: &head->lock);
9549
9550	/* Copy the bind_addr list from the original endpoint to the new
9551	* endpoint so that we can handle restarts properly
9552	*/
9553	err = sctp_bind_addr_dup(dest: &newsp->ep->base.bind_addr,
9554	src: &oldsp->ep->base.bind_addr, GFP_KERNEL);
9555	if (err)
9556	return err;
9557
9558	/* New ep's auth_hmacs should be set if old ep's is set, in case
9559	* that net->sctp.auth_enable has been changed to 0 by users and
9560	* new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9561	*/
9562	if (oldsp->ep->auth_hmacs) {
9563	err = sctp_auth_init_hmacs(ep: newsp->ep, GFP_KERNEL);
9564	if (err)
9565	return err;
9566	}
9567
9568	sctp_auto_asconf_init(sp: newsp);
9569
9570	/* Move any messages in the old socket's receive queue that are for the
9571	* peeled off association to the new socket's receive queue.
9572	*/
9573	sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9574	event = sctp_skb2event(skb);
9575	if (event->asoc == assoc) {
9576	__skb_unlink(skb, list: &oldsk->sk_receive_queue);
9577	__skb_queue_tail(list: &newsk->sk_receive_queue, newsk: skb);
9578	sctp_skb_set_owner_r_frag(skb, sk: newsk);
9579	}
9580	}
9581
9582	/* Clean up any messages pending delivery due to partial
9583	* delivery. Three cases:
9584	* 1) No partial deliver; no work.
9585	* 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9586	* 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9587	*/
9588	atomic_set(v: &sctp_sk(sk: newsk)->pd_mode, i: assoc->ulpq.pd_mode);
9589
9590	if (atomic_read(v: &sctp_sk(sk: oldsk)->pd_mode)) {
9591	struct sk_buff_head *queue;
9592
9593	/* Decide which queue to move pd_lobby skbs to. */
9594	if (assoc->ulpq.pd_mode) {
9595	queue = &newsp->pd_lobby;
9596	} else
9597	queue = &newsk->sk_receive_queue;
9598
9599	/* Walk through the pd_lobby, looking for skbs that
9600	* need moved to the new socket.
9601	*/
9602	sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9603	event = sctp_skb2event(skb);
9604	if (event->asoc == assoc) {
9605	__skb_unlink(skb, list: &oldsp->pd_lobby);
9606	__skb_queue_tail(list: queue, newsk: skb);
9607	sctp_skb_set_owner_r_frag(skb, sk: newsk);
9608	}
9609	}
9610
9611	/* Clear up any skbs waiting for the partial
9612	* delivery to finish.
9613	*/
9614	if (assoc->ulpq.pd_mode)
9615	sctp_clear_pd(sk: oldsk, NULL);
9616
9617	}
9618
9619	sctp_for_each_rx_skb(asoc: assoc, sk: newsk, cb: sctp_skb_set_owner_r_frag);
9620
9621	/* Set the type of socket to indicate that it is peeled off from the
9622	* original UDP-style socket or created with the accept() call on a
9623	* TCP-style socket..
9624	*/
9625	newsp->type = type;
9626
9627	/* Mark the new socket "in-use" by the user so that any packets
9628	* that may arrive on the association after we've moved it are
9629	* queued to the backlog. This prevents a potential race between
9630	* backlog processing on the old socket and new-packet processing
9631	* on the new socket.
9632	*
9633	* The caller has just allocated newsk so we can guarantee that other
9634	* paths won't try to lock it and then oldsk.
9635	*/
9636	lock_sock_nested(sk: newsk, SINGLE_DEPTH_NESTING);
9637	sctp_for_each_tx_datachunk(asoc: assoc, clear: true, cb: sctp_clear_owner_w);
9638	sctp_assoc_migrate(assoc, newsk);
9639	sctp_for_each_tx_datachunk(asoc: assoc, clear: false, cb: sctp_set_owner_w);
9640
9641	/* If the association on the newsk is already closed before accept()
9642	* is called, set RCV_SHUTDOWN flag.
9643	*/
9644	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9645	inet_sk_set_state(sk: newsk, state: SCTP_SS_CLOSED);
9646	newsk->sk_shutdown |= RCV_SHUTDOWN;
9647	} else {
9648	inet_sk_set_state(sk: newsk, state: SCTP_SS_ESTABLISHED);
9649	}
9650
9651	release_sock(sk: newsk);
9652
9653	return 0;
9654	}
9655
9656
9657	/* This proto struct describes the ULP interface for SCTP. */
9658	struct proto sctp_prot = {
9659	.name = "SCTP",
9660	.owner = THIS_MODULE,
9661	.close = sctp_close,
9662	.disconnect = sctp_disconnect,
9663	.accept = sctp_accept,
9664	.ioctl = sctp_ioctl,
9665	.init = sctp_init_sock,
9666	.destroy = sctp_destroy_sock,
9667	.shutdown = sctp_shutdown,
9668	.setsockopt = sctp_setsockopt,
9669	.getsockopt = sctp_getsockopt,
9670	.bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9671	.sendmsg = sctp_sendmsg,
9672	.recvmsg = sctp_recvmsg,
9673	.bind = sctp_bind,
9674	.bind_add = sctp_bind_add,
9675	.backlog_rcv = sctp_backlog_rcv,
9676	.hash = sctp_hash,
9677	.unhash = sctp_unhash,
9678	.no_autobind = true,
9679	.obj_size = sizeof(struct sctp_sock),
9680	.useroffset = offsetof(struct sctp_sock, subscribe),
9681	.usersize = offsetof(struct sctp_sock, initmsg) -
9682	offsetof(struct sctp_sock, subscribe) +
9683	sizeof_field(struct sctp_sock, initmsg),
9684	.sysctl_mem = sysctl_sctp_mem,
9685	.sysctl_rmem = sysctl_sctp_rmem,
9686	.sysctl_wmem = sysctl_sctp_wmem,
9687	.memory_pressure = &sctp_memory_pressure,
9688	.enter_memory_pressure = sctp_enter_memory_pressure,
9689
9690	.memory_allocated = &sctp_memory_allocated,
9691	.per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9692
9693	.sockets_allocated = &sctp_sockets_allocated,
9694	};
9695
9696	#if IS_ENABLED(CONFIG_IPV6)
9697
9698	static void sctp_v6_destruct_sock(struct sock *sk)
9699	{
9700	sctp_destruct_common(sk);
9701	inet6_sock_destruct(sk);
9702	}
9703
9704	static int sctp_v6_init_sock(struct sock *sk)
9705	{
9706	int ret = sctp_init_sock(sk);
9707
9708	if (!ret)
9709	sk->sk_destruct = sctp_v6_destruct_sock;
9710
9711	return ret;
9712	}
9713
9714	struct proto sctpv6_prot = {
9715	.name = "SCTPv6",
9716	.owner = THIS_MODULE,
9717	.close = sctp_close,
9718	.disconnect = sctp_disconnect,
9719	.accept = sctp_accept,
9720	.ioctl = sctp_ioctl,
9721	.init = sctp_v6_init_sock,
9722	.destroy = sctp_destroy_sock,
9723	.shutdown = sctp_shutdown,
9724	.setsockopt = sctp_setsockopt,
9725	.getsockopt = sctp_getsockopt,
9726	.bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9727	.sendmsg = sctp_sendmsg,
9728	.recvmsg = sctp_recvmsg,
9729	.bind = sctp_bind,
9730	.bind_add = sctp_bind_add,
9731	.backlog_rcv = sctp_backlog_rcv,
9732	.hash = sctp_hash,
9733	.unhash = sctp_unhash,
9734	.no_autobind = true,
9735	.obj_size = sizeof(struct sctp6_sock),
9736	.ipv6_pinfo_offset = offsetof(struct sctp6_sock, inet6),
9737	.useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9738	.usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9739	offsetof(struct sctp6_sock, sctp.subscribe) +
9740	sizeof_field(struct sctp6_sock, sctp.initmsg),
9741	.sysctl_mem = sysctl_sctp_mem,
9742	.sysctl_rmem = sysctl_sctp_rmem,
9743	.sysctl_wmem = sysctl_sctp_wmem,
9744	.memory_pressure = &sctp_memory_pressure,
9745	.enter_memory_pressure = sctp_enter_memory_pressure,
9746
9747	.memory_allocated = &sctp_memory_allocated,
9748	.per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9749
9750	.sockets_allocated = &sctp_sockets_allocated,
9751	};
9752	#endif /* IS_ENABLED(CONFIG_IPV6) */
9753