1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* inet_diag.c Module for monitoring INET transport protocols sockets.
4	*
5	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6	*/
7
8	#include <linux/kernel.h>
9	#include <linux/module.h>
10	#include <linux/types.h>
11	#include <linux/fcntl.h>
12	#include <linux/random.h>
13	#include <linux/slab.h>
14	#include <linux/cache.h>
15	#include <linux/init.h>
16	#include <linux/time.h>
17
18	#include <net/icmp.h>
19	#include <net/tcp.h>
20	#include <net/ipv6.h>
21	#include <net/inet_common.h>
22	#include <net/inet_connection_sock.h>
23	#include <net/inet_hashtables.h>
24	#include <net/inet_timewait_sock.h>
25	#include <net/inet6_hashtables.h>
26	#include <net/bpf_sk_storage.h>
27	#include <net/netlink.h>
28
29	#include <linux/inet.h>
30	#include <linux/stddef.h>
31
32	#include <linux/inet_diag.h>
33	#include <linux/sock_diag.h>
34
35	static const struct inet_diag_handler **inet_diag_table;
36
37	struct inet_diag_entry {
38	const __be32 *saddr;
39	const __be32 *daddr;
40	u16 sport;
41	u16 dport;
42	u16 family;
43	u16 userlocks;
44	u32 ifindex;
45	u32 mark;
46	#ifdef CONFIG_SOCK_CGROUP_DATA
47	u64 cgroup_id;
48	#endif
49	};
50
51	static DEFINE_MUTEX(inet_diag_table_mutex);
52
53	static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54	{
55	if (proto < 0 || proto >= IPPROTO_MAX) {
56	mutex_lock(&inet_diag_table_mutex);
57	return ERR_PTR(error: -ENOENT);
58	}
59
60	if (!inet_diag_table[proto])
61	sock_load_diag_module(AF_INET, protocol: proto);
62
63	mutex_lock(&inet_diag_table_mutex);
64	if (!inet_diag_table[proto])
65	return ERR_PTR(error: -ENOENT);
66
67	return inet_diag_table[proto];
68	}
69
70	static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
71	{
72	mutex_unlock(lock: &inet_diag_table_mutex);
73	}
74
75	void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
76	{
77	r->idiag_family = sk->sk_family;
78
79	r->id.idiag_sport = htons(sk->sk_num);
80	r->id.idiag_dport = sk->sk_dport;
81	r->id.idiag_if = sk->sk_bound_dev_if;
82	sock_diag_save_cookie(sk, cookie: r->id.idiag_cookie);
83
84	#if IS_ENABLED(CONFIG_IPV6)
85	if (sk->sk_family == AF_INET6) {
86	*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
87	*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
88	} else
89	#endif
90	{
91	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
92	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
93
94	r->id.idiag_src[0] = sk->sk_rcv_saddr;
95	r->id.idiag_dst[0] = sk->sk_daddr;
96	}
97	}
98	EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
99
100	static size_t inet_sk_attr_size(struct sock *sk,
101	const struct inet_diag_req_v2 *req,
102	bool net_admin)
103	{
104	const struct inet_diag_handler *handler;
105	size_t aux = 0;
106
107	handler = inet_diag_table[req->sdiag_protocol];
108	if (handler && handler->idiag_get_aux_size)
109	aux = handler->idiag_get_aux_size(sk, net_admin);
110
111	return nla_total_size(payload: sizeof(struct tcp_info))
112	+ nla_total_size(payload: sizeof(struct inet_diag_msg))
113	+ inet_diag_msg_attrs_size()
114	+ nla_total_size(payload: sizeof(struct inet_diag_meminfo))
115	+ nla_total_size(payload: SK_MEMINFO_VARS * sizeof(u32))
116	+ nla_total_size(TCP_CA_NAME_MAX)
117	+ nla_total_size(payload: sizeof(struct tcpvegas_info))
118	+ aux
119	+ 64;
120	}
121
122	int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
123	struct inet_diag_msg *r, int ext,
124	struct user_namespace *user_ns,
125	bool net_admin)
126	{
127	const struct inet_sock *inet = inet_sk(sk);
128	struct inet_diag_sockopt inet_sockopt;
129
130	if (nla_put_u8(skb, attrtype: INET_DIAG_SHUTDOWN, value: sk->sk_shutdown))
131	goto errout;
132
133	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
134	* hence this needs to be included regardless of socket family.
135	*/
136	if (ext & (1 << (INET_DIAG_TOS - 1)))
137	if (nla_put_u8(skb, attrtype: INET_DIAG_TOS, READ_ONCE(inet->tos)) < 0)
138	goto errout;
139
140	#if IS_ENABLED(CONFIG_IPV6)
141	if (r->idiag_family == AF_INET6) {
142	if (ext & (1 << (INET_DIAG_TCLASS - 1)))
143	if (nla_put_u8(skb, attrtype: INET_DIAG_TCLASS,
144	value: inet6_sk(sk: sk)->tclass) < 0)
145	goto errout;
146
147	if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
148	nla_put_u8(skb, attrtype: INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
149	goto errout;
150	}
151	#endif
152
153	if (net_admin && nla_put_u32(skb, attrtype: INET_DIAG_MARK, READ_ONCE(sk->sk_mark)))
154	goto errout;
155
156	if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
157	ext & (1 << (INET_DIAG_TCLASS - 1))) {
158	u32 classid = 0;
159
160	#ifdef CONFIG_SOCK_CGROUP_DATA
161	classid = sock_cgroup_classid(skcd: &sk->sk_cgrp_data);
162	#endif
163	/* Fallback to socket priority if class id isn't set.
164	* Classful qdiscs use it as direct reference to class.
165	* For cgroup2 classid is always zero.
166	*/
167	if (!classid)
168	classid = READ_ONCE(sk->sk_priority);
169
170	if (nla_put_u32(skb, attrtype: INET_DIAG_CLASS_ID, value: classid))
171	goto errout;
172	}
173
174	#ifdef CONFIG_SOCK_CGROUP_DATA
175	if (nla_put_u64_64bit(skb, attrtype: INET_DIAG_CGROUP_ID,
176	value: cgroup_id(cgrp: sock_cgroup_ptr(skcd: &sk->sk_cgrp_data)),
177	padattr: INET_DIAG_PAD))
178	goto errout;
179	#endif
180
181	r->idiag_uid = from_kuid_munged(to: user_ns, uid: sock_i_uid(sk));
182	r->idiag_inode = sock_i_ino(sk);
183
184	memset(&inet_sockopt, 0, sizeof(inet_sockopt));
185	inet_sockopt.recverr = inet_test_bit(RECVERR, sk);
186	inet_sockopt.is_icsk = inet_test_bit(IS_ICSK, sk);
187	inet_sockopt.freebind = inet_test_bit(FREEBIND, sk);
188	inet_sockopt.hdrincl = inet_test_bit(HDRINCL, sk);
189	inet_sockopt.mc_loop = inet_test_bit(MC_LOOP, sk);
190	inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
191	inet_sockopt.mc_all = inet_test_bit(MC_ALL, sk);
192	inet_sockopt.nodefrag = inet_test_bit(NODEFRAG, sk);
193	inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
194	inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
195	inet_sockopt.defer_connect = inet_test_bit(DEFER_CONNECT, sk);
196	if (nla_put(skb, attrtype: INET_DIAG_SOCKOPT, attrlen: sizeof(inet_sockopt),
197	data: &inet_sockopt))
198	goto errout;
199
200	return 0;
201	errout:
202	return 1;
203	}
204	EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
205
206	static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
207	struct nlattr **req_nlas)
208	{
209	struct nlattr *nla;
210	int remaining;
211
212	nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
213	int type = nla_type(nla);
214
215	if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
216	return -EINVAL;
217
218	if (type < __INET_DIAG_REQ_MAX)
219	req_nlas[type] = nla;
220	}
221	return 0;
222	}
223
224	static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
225	const struct inet_diag_dump_data *data)
226	{
227	if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
228	return nla_get_u32(nla: data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
229	return req->sdiag_protocol;
230	}
231
232	#define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
233
234	int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
235	struct sk_buff *skb, struct netlink_callback *cb,
236	const struct inet_diag_req_v2 *req,
237	u16 nlmsg_flags, bool net_admin)
238	{
239	const struct tcp_congestion_ops *ca_ops;
240	const struct inet_diag_handler *handler;
241	struct inet_diag_dump_data *cb_data;
242	int ext = req->idiag_ext;
243	struct inet_diag_msg *r;
244	struct nlmsghdr *nlh;
245	struct nlattr *attr;
246	void *info = NULL;
247
248	cb_data = cb->data;
249	handler = inet_diag_table[inet_diag_get_protocol(req, data: cb_data)];
250	BUG_ON(!handler);
251
252	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, seq: cb->nlh->nlmsg_seq,
253	type: cb->nlh->nlmsg_type, payload: sizeof(*r), flags: nlmsg_flags);
254	if (!nlh)
255	return -EMSGSIZE;
256
257	r = nlmsg_data(nlh);
258	BUG_ON(!sk_fullsock(sk));
259
260	inet_diag_msg_common_fill(r, sk);
261	r->idiag_state = sk->sk_state;
262	r->idiag_timer = 0;
263	r->idiag_retrans = 0;
264	r->idiag_expires = 0;
265
266	if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
267	sk_user_ns(NETLINK_CB(cb->skb).sk),
268	net_admin))
269	goto errout;
270
271	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
272	struct inet_diag_meminfo minfo = {
273	.idiag_rmem = sk_rmem_alloc_get(sk),
274	.idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
275	.idiag_fmem = sk_forward_alloc_get(sk),
276	.idiag_tmem = sk_wmem_alloc_get(sk),
277	};
278
279	if (nla_put(skb, attrtype: INET_DIAG_MEMINFO, attrlen: sizeof(minfo), data: &minfo) < 0)
280	goto errout;
281	}
282
283	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
284	if (sock_diag_put_meminfo(sk, skb, attr: INET_DIAG_SKMEMINFO))
285	goto errout;
286
287	/*
288	* RAW sockets might have user-defined protocols assigned,
289	* so report the one supplied on socket creation.
290	*/
291	if (sk->sk_type == SOCK_RAW) {
292	if (nla_put_u8(skb, attrtype: INET_DIAG_PROTOCOL, value: sk->sk_protocol))
293	goto errout;
294	}
295
296	if (!icsk) {
297	handler->idiag_get_info(sk, r, NULL);
298	goto out;
299	}
300
301	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
302	icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
303	icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
304	r->idiag_timer = 1;
305	r->idiag_retrans = icsk->icsk_retransmits;
306	r->idiag_expires =
307	jiffies_delta_to_msecs(delta: icsk->icsk_timeout - jiffies);
308	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
309	r->idiag_timer = 4;
310	r->idiag_retrans = icsk->icsk_probes_out;
311	r->idiag_expires =
312	jiffies_delta_to_msecs(delta: icsk->icsk_timeout - jiffies);
313	} else if (timer_pending(timer: &sk->sk_timer)) {
314	r->idiag_timer = 2;
315	r->idiag_retrans = icsk->icsk_probes_out;
316	r->idiag_expires =
317	jiffies_delta_to_msecs(delta: sk->sk_timer.expires - jiffies);
318	}
319
320	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
321	attr = nla_reserve_64bit(skb, attrtype: INET_DIAG_INFO,
322	attrlen: handler->idiag_info_size,
323	padattr: INET_DIAG_PAD);
324	if (!attr)
325	goto errout;
326
327	info = nla_data(nla: attr);
328	}
329
330	if (ext & (1 << (INET_DIAG_CONG - 1))) {
331	int err = 0;
332
333	rcu_read_lock();
334	ca_ops = READ_ONCE(icsk->icsk_ca_ops);
335	if (ca_ops)
336	err = nla_put_string(skb, attrtype: INET_DIAG_CONG, str: ca_ops->name);
337	rcu_read_unlock();
338	if (err < 0)
339	goto errout;
340	}
341
342	handler->idiag_get_info(sk, r, info);
343
344	if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
345	if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
346	goto errout;
347
348	if (sk->sk_state < TCP_TIME_WAIT) {
349	union tcp_cc_info info;
350	size_t sz = 0;
351	int attr;
352
353	rcu_read_lock();
354	ca_ops = READ_ONCE(icsk->icsk_ca_ops);
355	if (ca_ops && ca_ops->get_info)
356	sz = ca_ops->get_info(sk, ext, &attr, &info);
357	rcu_read_unlock();
358	if (sz && nla_put(skb, attrtype: attr, attrlen: sz, data: &info) < 0)
359	goto errout;
360	}
361
362	/* Keep it at the end for potential retry with a larger skb,
363	* or else do best-effort fitting, which is only done for the
364	* first_nlmsg.
365	*/
366	if (cb_data->bpf_stg_diag) {
367	bool first_nlmsg = ((unsigned char *)nlh == skb->data);
368	unsigned int prev_min_dump_alloc;
369	unsigned int total_nla_size = 0;
370	unsigned int msg_len;
371	int err;
372
373	msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
374	err = bpf_sk_storage_diag_put(diag: cb_data->bpf_stg_diag, sk, skb,
375	stg_array_type: INET_DIAG_SK_BPF_STORAGES,
376	res_diag_size: &total_nla_size);
377
378	if (!err)
379	goto out;
380
381	total_nla_size += msg_len;
382	prev_min_dump_alloc = cb->min_dump_alloc;
383	if (total_nla_size > prev_min_dump_alloc)
384	cb->min_dump_alloc = min_t(u32, total_nla_size,
385	MAX_DUMP_ALLOC_SIZE);
386
387	if (!first_nlmsg)
388	goto errout;
389
390	if (cb->min_dump_alloc > prev_min_dump_alloc)
391	/* Retry with pskb_expand_head() with
392	* __GFP_DIRECT_RECLAIM
393	*/
394	goto errout;
395
396	WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
397
398	/* Send what we have for this sk
399	* and move on to the next sk in the following
400	* dump()
401	*/
402	}
403
404	out:
405	nlmsg_end(skb, nlh);
406	return 0;
407
408	errout:
409	nlmsg_cancel(skb, nlh);
410	return -EMSGSIZE;
411	}
412	EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
413
414	static int inet_twsk_diag_fill(struct sock *sk,
415	struct sk_buff *skb,
416	struct netlink_callback *cb,
417	u16 nlmsg_flags, bool net_admin)
418	{
419	struct inet_timewait_sock *tw = inet_twsk(sk);
420	struct inet_diag_msg *r;
421	struct nlmsghdr *nlh;
422	long tmo;
423
424	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
425	seq: cb->nlh->nlmsg_seq, type: cb->nlh->nlmsg_type,
426	payload: sizeof(*r), flags: nlmsg_flags);
427	if (!nlh)
428	return -EMSGSIZE;
429
430	r = nlmsg_data(nlh);
431	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
432
433	inet_diag_msg_common_fill(r, sk);
434	r->idiag_retrans = 0;
435
436	r->idiag_state = tw->tw_substate;
437	r->idiag_timer = 3;
438	tmo = tw->tw_timer.expires - jiffies;
439	r->idiag_expires = jiffies_delta_to_msecs(delta: tmo);
440	r->idiag_rqueue = 0;
441	r->idiag_wqueue = 0;
442	r->idiag_uid = 0;
443	r->idiag_inode = 0;
444
445	if (net_admin && nla_put_u32(skb, attrtype: INET_DIAG_MARK,
446	value: tw->tw_mark)) {
447	nlmsg_cancel(skb, nlh);
448	return -EMSGSIZE;
449	}
450
451	nlmsg_end(skb, nlh);
452	return 0;
453	}
454
455	static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
456	struct netlink_callback *cb,
457	u16 nlmsg_flags, bool net_admin)
458	{
459	struct request_sock *reqsk = inet_reqsk(sk);
460	struct inet_diag_msg *r;
461	struct nlmsghdr *nlh;
462	long tmo;
463
464	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, seq: cb->nlh->nlmsg_seq,
465	type: cb->nlh->nlmsg_type, payload: sizeof(*r), flags: nlmsg_flags);
466	if (!nlh)
467	return -EMSGSIZE;
468
469	r = nlmsg_data(nlh);
470	inet_diag_msg_common_fill(r, sk);
471	r->idiag_state = TCP_SYN_RECV;
472	r->idiag_timer = 1;
473	r->idiag_retrans = reqsk->num_retrans;
474
475	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
476	offsetof(struct sock, sk_cookie));
477
478	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
479	r->idiag_expires = jiffies_delta_to_msecs(delta: tmo);
480	r->idiag_rqueue = 0;
481	r->idiag_wqueue = 0;
482	r->idiag_uid = 0;
483	r->idiag_inode = 0;
484
485	if (net_admin && nla_put_u32(skb, attrtype: INET_DIAG_MARK,
486	value: inet_rsk(sk: reqsk)->ir_mark)) {
487	nlmsg_cancel(skb, nlh);
488	return -EMSGSIZE;
489	}
490
491	nlmsg_end(skb, nlh);
492	return 0;
493	}
494
495	static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
496	struct netlink_callback *cb,
497	const struct inet_diag_req_v2 *r,
498	u16 nlmsg_flags, bool net_admin)
499	{
500	if (sk->sk_state == TCP_TIME_WAIT)
501	return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
502
503	if (sk->sk_state == TCP_NEW_SYN_RECV)
504	return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
505
506	return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
507	net_admin);
508	}
509
510	struct sock *inet_diag_find_one_icsk(struct net *net,
511	struct inet_hashinfo *hashinfo,
512	const struct inet_diag_req_v2 *req)
513	{
514	struct sock *sk;
515
516	rcu_read_lock();
517	if (req->sdiag_family == AF_INET)
518	sk = inet_lookup(net, hashinfo, NULL, doff: 0, saddr: req->id.idiag_dst[0],
519	sport: req->id.idiag_dport, daddr: req->id.idiag_src[0],
520	dport: req->id.idiag_sport, dif: req->id.idiag_if);
521	#if IS_ENABLED(CONFIG_IPV6)
522	else if (req->sdiag_family == AF_INET6) {
523	if (ipv6_addr_v4mapped(a: (struct in6_addr *)req->id.idiag_dst) &&
524	ipv6_addr_v4mapped(a: (struct in6_addr *)req->id.idiag_src))
525	sk = inet_lookup(net, hashinfo, NULL, doff: 0, saddr: req->id.idiag_dst[3],
526	sport: req->id.idiag_dport, daddr: req->id.idiag_src[3],
527	dport: req->id.idiag_sport, dif: req->id.idiag_if);
528	else
529	sk = inet6_lookup(net, hashinfo, NULL, doff: 0,
530	saddr: (struct in6_addr *)req->id.idiag_dst,
531	sport: req->id.idiag_dport,
532	daddr: (struct in6_addr *)req->id.idiag_src,
533	dport: req->id.idiag_sport,
534	dif: req->id.idiag_if);
535	}
536	#endif
537	else {
538	rcu_read_unlock();
539	return ERR_PTR(error: -EINVAL);
540	}
541	rcu_read_unlock();
542	if (!sk)
543	return ERR_PTR(error: -ENOENT);
544
545	if (sock_diag_check_cookie(sk, cookie: req->id.idiag_cookie)) {
546	sock_gen_put(sk);
547	return ERR_PTR(error: -ENOENT);
548	}
549
550	return sk;
551	}
552	EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
553
554	int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
555	struct netlink_callback *cb,
556	const struct inet_diag_req_v2 *req)
557	{
558	struct sk_buff *in_skb = cb->skb;
559	bool net_admin = netlink_net_capable(skb: in_skb, CAP_NET_ADMIN);
560	struct net *net = sock_net(sk: in_skb->sk);
561	struct sk_buff *rep;
562	struct sock *sk;
563	int err;
564
565	sk = inet_diag_find_one_icsk(net, hashinfo, req);
566	if (IS_ERR(ptr: sk))
567	return PTR_ERR(ptr: sk);
568
569	rep = nlmsg_new(payload: inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
570	if (!rep) {
571	err = -ENOMEM;
572	goto out;
573	}
574
575	err = sk_diag_fill(sk, skb: rep, cb, r: req, nlmsg_flags: 0, net_admin);
576	if (err < 0) {
577	WARN_ON(err == -EMSGSIZE);
578	nlmsg_free(skb: rep);
579	goto out;
580	}
581	err = nlmsg_unicast(sk: net->diag_nlsk, skb: rep, NETLINK_CB(in_skb).portid);
582
583	out:
584	if (sk)
585	sock_gen_put(sk);
586
587	return err;
588	}
589	EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
590
591	static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
592	const struct nlmsghdr *nlh,
593	int hdrlen,
594	const struct inet_diag_req_v2 *req)
595	{
596	const struct inet_diag_handler *handler;
597	struct inet_diag_dump_data dump_data;
598	int err, protocol;
599
600	memset(&dump_data, 0, sizeof(dump_data));
601	err = inet_diag_parse_attrs(nlh, hdrlen, req_nlas: dump_data.req_nlas);
602	if (err)
603	return err;
604
605	protocol = inet_diag_get_protocol(req, data: &dump_data);
606
607	handler = inet_diag_lock_handler(proto: protocol);
608	if (IS_ERR(ptr: handler)) {
609	err = PTR_ERR(ptr: handler);
610	} else if (cmd == SOCK_DIAG_BY_FAMILY) {
611	struct netlink_callback cb = {
612	.nlh = nlh,
613	.skb = in_skb,
614	.data = &dump_data,
615	};
616	err = handler->dump_one(&cb, req);
617	} else if (cmd == SOCK_DESTROY && handler->destroy) {
618	err = handler->destroy(in_skb, req);
619	} else {
620	err = -EOPNOTSUPP;
621	}
622	inet_diag_unlock_handler(handler);
623
624	return err;
625	}
626
627	static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
628	{
629	int words = bits >> 5;
630
631	bits &= 0x1f;
632
633	if (words) {
634	if (memcmp(p: a1, q: a2, size: words << 2))
635	return 0;
636	}
637	if (bits) {
638	__be32 w1, w2;
639	__be32 mask;
640
641	w1 = a1[words];
642	w2 = a2[words];
643
644	mask = htonl((0xffffffff) << (32 - bits));
645
646	if ((w1 ^ w2) & mask)
647	return 0;
648	}
649
650	return 1;
651	}
652
653	static int inet_diag_bc_run(const struct nlattr *_bc,
654	const struct inet_diag_entry *entry)
655	{
656	const void *bc = nla_data(nla: _bc);
657	int len = nla_len(nla: _bc);
658
659	while (len > 0) {
660	int yes = 1;
661	const struct inet_diag_bc_op *op = bc;
662
663	switch (op->code) {
664	case INET_DIAG_BC_NOP:
665	break;
666	case INET_DIAG_BC_JMP:
667	yes = 0;
668	break;
669	case INET_DIAG_BC_S_EQ:
670	yes = entry->sport == op[1].no;
671	break;
672	case INET_DIAG_BC_S_GE:
673	yes = entry->sport >= op[1].no;
674	break;
675	case INET_DIAG_BC_S_LE:
676	yes = entry->sport <= op[1].no;
677	break;
678	case INET_DIAG_BC_D_EQ:
679	yes = entry->dport == op[1].no;
680	break;
681	case INET_DIAG_BC_D_GE:
682	yes = entry->dport >= op[1].no;
683	break;
684	case INET_DIAG_BC_D_LE:
685	yes = entry->dport <= op[1].no;
686	break;
687	case INET_DIAG_BC_AUTO:
688	yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
689	break;
690	case INET_DIAG_BC_S_COND:
691	case INET_DIAG_BC_D_COND: {
692	const struct inet_diag_hostcond *cond;
693	const __be32 *addr;
694
695	cond = (const struct inet_diag_hostcond *)(op + 1);
696	if (cond->port != -1 &&
697	cond->port != (op->code == INET_DIAG_BC_S_COND ?
698	entry->sport : entry->dport)) {
699	yes = 0;
700	break;
701	}
702
703	if (op->code == INET_DIAG_BC_S_COND)
704	addr = entry->saddr;
705	else
706	addr = entry->daddr;
707
708	if (cond->family != AF_UNSPEC &&
709	cond->family != entry->family) {
710	if (entry->family == AF_INET6 &&
711	cond->family == AF_INET) {
712	if (addr[0] == 0 && addr[1] == 0 &&
713	addr[2] == htonl(0xffff) &&
714	bitstring_match(a1: addr + 3,
715	a2: cond->addr,
716	bits: cond->prefix_len))
717	break;
718	}
719	yes = 0;
720	break;
721	}
722
723	if (cond->prefix_len == 0)
724	break;
725	if (bitstring_match(a1: addr, a2: cond->addr,
726	bits: cond->prefix_len))
727	break;
728	yes = 0;
729	break;
730	}
731	case INET_DIAG_BC_DEV_COND: {
732	u32 ifindex;
733
734	ifindex = *((const u32 *)(op + 1));
735	if (ifindex != entry->ifindex)
736	yes = 0;
737	break;
738	}
739	case INET_DIAG_BC_MARK_COND: {
740	struct inet_diag_markcond *cond;
741
742	cond = (struct inet_diag_markcond *)(op + 1);
743	if ((entry->mark & cond->mask) != cond->mark)
744	yes = 0;
745	break;
746	}
747	#ifdef CONFIG_SOCK_CGROUP_DATA
748	case INET_DIAG_BC_CGROUP_COND: {
749	u64 cgroup_id;
750
751	cgroup_id = get_unaligned((const u64 *)(op + 1));
752	if (cgroup_id != entry->cgroup_id)
753	yes = 0;
754	break;
755	}
756	#endif
757	}
758
759	if (yes) {
760	len -= op->yes;
761	bc += op->yes;
762	} else {
763	len -= op->no;
764	bc += op->no;
765	}
766	}
767	return len == 0;
768	}
769
770	/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
771	*/
772	static void entry_fill_addrs(struct inet_diag_entry *entry,
773	const struct sock *sk)
774	{
775	#if IS_ENABLED(CONFIG_IPV6)
776	if (sk->sk_family == AF_INET6) {
777	entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
778	entry->daddr = sk->sk_v6_daddr.s6_addr32;
779	} else
780	#endif
781	{
782	entry->saddr = &sk->sk_rcv_saddr;
783	entry->daddr = &sk->sk_daddr;
784	}
785	}
786
787	int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
788	{
789	struct inet_sock *inet = inet_sk(sk);
790	struct inet_diag_entry entry;
791
792	if (!bc)
793	return 1;
794
795	entry.family = sk->sk_family;
796	entry_fill_addrs(entry: &entry, sk);
797	entry.sport = inet->inet_num;
798	entry.dport = ntohs(inet->inet_dport);
799	entry.ifindex = sk->sk_bound_dev_if;
800	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
801	if (sk_fullsock(sk))
802	entry.mark = READ_ONCE(sk->sk_mark);
803	else if (sk->sk_state == TCP_NEW_SYN_RECV)
804	entry.mark = inet_rsk(sk: inet_reqsk(sk))->ir_mark;
805	else if (sk->sk_state == TCP_TIME_WAIT)
806	entry.mark = inet_twsk(sk)->tw_mark;
807	else
808	entry.mark = 0;
809	#ifdef CONFIG_SOCK_CGROUP_DATA
810	entry.cgroup_id = sk_fullsock(sk) ?
811	cgroup_id(cgrp: sock_cgroup_ptr(skcd: &sk->sk_cgrp_data)) : 0;
812	#endif
813
814	return inet_diag_bc_run(bc: bc, entry: &entry);
815	}
816	EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
817
818	static int valid_cc(const void *bc, int len, int cc)
819	{
820	while (len >= 0) {
821	const struct inet_diag_bc_op *op = bc;
822
823	if (cc > len)
824	return 0;
825	if (cc == len)
826	return 1;
827	if (op->yes < 4 || op->yes & 3)
828	return 0;
829	len -= op->yes;
830	bc += op->yes;
831	}
832	return 0;
833	}
834
835	/* data is u32 ifindex */
836	static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
837	int *min_len)
838	{
839	/* Check ifindex space. */
840	*min_len += sizeof(u32);
841	if (len < *min_len)
842	return false;
843
844	return true;
845	}
846	/* Validate an inet_diag_hostcond. */
847	static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
848	int *min_len)
849	{
850	struct inet_diag_hostcond *cond;
851	int addr_len;
852
853	/* Check hostcond space. */
854	*min_len += sizeof(struct inet_diag_hostcond);
855	if (len < *min_len)
856	return false;
857	cond = (struct inet_diag_hostcond *)(op + 1);
858
859	/* Check address family and address length. */
860	switch (cond->family) {
861	case AF_UNSPEC:
862	addr_len = 0;
863	break;
864	case AF_INET:
865	addr_len = sizeof(struct in_addr);
866	break;
867	case AF_INET6:
868	addr_len = sizeof(struct in6_addr);
869	break;
870	default:
871	return false;
872	}
873	*min_len += addr_len;
874	if (len < *min_len)
875	return false;
876
877	/* Check prefix length (in bits) vs address length (in bytes). */
878	if (cond->prefix_len > 8 * addr_len)
879	return false;
880
881	return true;
882	}
883
884	/* Validate a port comparison operator. */
885	static bool valid_port_comparison(const struct inet_diag_bc_op *op,
886	int len, int *min_len)
887	{
888	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
889	*min_len += sizeof(struct inet_diag_bc_op);
890	if (len < *min_len)
891	return false;
892	return true;
893	}
894
895	static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
896	int *min_len)
897	{
898	*min_len += sizeof(struct inet_diag_markcond);
899	return len >= *min_len;
900	}
901
902	#ifdef CONFIG_SOCK_CGROUP_DATA
903	static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
904	int *min_len)
905	{
906	*min_len += sizeof(u64);
907	return len >= *min_len;
908	}
909	#endif
910
911	static int inet_diag_bc_audit(const struct nlattr *attr,
912	const struct sk_buff *skb)
913	{
914	bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
915	const void *bytecode, *bc;
916	int bytecode_len, len;
917
918	if (!attr || nla_len(nla: attr) < sizeof(struct inet_diag_bc_op))
919	return -EINVAL;
920
921	bytecode = bc = nla_data(nla: attr);
922	len = bytecode_len = nla_len(nla: attr);
923
924	while (len > 0) {
925	int min_len = sizeof(struct inet_diag_bc_op);
926	const struct inet_diag_bc_op *op = bc;
927
928	switch (op->code) {
929	case INET_DIAG_BC_S_COND:
930	case INET_DIAG_BC_D_COND:
931	if (!valid_hostcond(op: bc, len, min_len: &min_len))
932	return -EINVAL;
933	break;
934	case INET_DIAG_BC_DEV_COND:
935	if (!valid_devcond(op: bc, len, min_len: &min_len))
936	return -EINVAL;
937	break;
938	case INET_DIAG_BC_S_EQ:
939	case INET_DIAG_BC_S_GE:
940	case INET_DIAG_BC_S_LE:
941	case INET_DIAG_BC_D_EQ:
942	case INET_DIAG_BC_D_GE:
943	case INET_DIAG_BC_D_LE:
944	if (!valid_port_comparison(op: bc, len, min_len: &min_len))
945	return -EINVAL;
946	break;
947	case INET_DIAG_BC_MARK_COND:
948	if (!net_admin)
949	return -EPERM;
950	if (!valid_markcond(op: bc, len, min_len: &min_len))
951	return -EINVAL;
952	break;
953	#ifdef CONFIG_SOCK_CGROUP_DATA
954	case INET_DIAG_BC_CGROUP_COND:
955	if (!valid_cgroupcond(op: bc, len, min_len: &min_len))
956	return -EINVAL;
957	break;
958	#endif
959	case INET_DIAG_BC_AUTO:
960	case INET_DIAG_BC_JMP:
961	case INET_DIAG_BC_NOP:
962	break;
963	default:
964	return -EINVAL;
965	}
966
967	if (op->code != INET_DIAG_BC_NOP) {
968	if (op->no < min_len || op->no > len + 4 || op->no & 3)
969	return -EINVAL;
970	if (op->no < len &&
971	!valid_cc(bc: bytecode, len: bytecode_len, cc: len - op->no))
972	return -EINVAL;
973	}
974
975	if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
976	return -EINVAL;
977	bc += op->yes;
978	len -= op->yes;
979	}
980	return len == 0 ? 0 : -EINVAL;
981	}
982
983	static void twsk_build_assert(void)
984	{
985	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
986	offsetof(struct sock, sk_family));
987
988	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
989	offsetof(struct inet_sock, inet_num));
990
991	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
992	offsetof(struct inet_sock, inet_dport));
993
994	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
995	offsetof(struct inet_sock, inet_rcv_saddr));
996
997	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
998	offsetof(struct inet_sock, inet_daddr));
999
1000	#if IS_ENABLED(CONFIG_IPV6)
1001	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1002	offsetof(struct sock, sk_v6_rcv_saddr));
1003
1004	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1005	offsetof(struct sock, sk_v6_daddr));
1006	#endif
1007	}
1008
1009	void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1010	struct netlink_callback *cb,
1011	const struct inet_diag_req_v2 *r)
1012	{
1013	bool net_admin = netlink_net_capable(skb: cb->skb, CAP_NET_ADMIN);
1014	struct inet_diag_dump_data *cb_data = cb->data;
1015	struct net *net = sock_net(sk: skb->sk);
1016	u32 idiag_states = r->idiag_states;
1017	int i, num, s_i, s_num;
1018	struct nlattr *bc;
1019	struct sock *sk;
1020
1021	bc = cb_data->inet_diag_nla_bc;
1022	if (idiag_states & TCPF_SYN_RECV)
1023	idiag_states |= TCPF_NEW_SYN_RECV;
1024	s_i = cb->args[1];
1025	s_num = num = cb->args[2];
1026
1027	if (cb->args[0] == 0) {
1028	if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1029	goto skip_listen_ht;
1030
1031	for (i = s_i; i <= hashinfo->lhash2_mask; i++) {
1032	struct inet_listen_hashbucket *ilb;
1033	struct hlist_nulls_node *node;
1034
1035	num = 0;
1036	ilb = &hashinfo->lhash2[i];
1037
1038	spin_lock(lock: &ilb->lock);
1039	sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1040	struct inet_sock *inet = inet_sk(sk);
1041
1042	if (!net_eq(net1: sock_net(sk), net2: net))
1043	continue;
1044
1045	if (num < s_num) {
1046	num++;
1047	continue;
1048	}
1049
1050	if (r->sdiag_family != AF_UNSPEC &&
1051	sk->sk_family != r->sdiag_family)
1052	goto next_listen;
1053
1054	if (r->id.idiag_sport != inet->inet_sport &&
1055	r->id.idiag_sport)
1056	goto next_listen;
1057
1058	if (!inet_diag_bc_sk(bc, sk))
1059	goto next_listen;
1060
1061	if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1062	cb, r, NLM_F_MULTI,
1063	net_admin) < 0) {
1064	spin_unlock(lock: &ilb->lock);
1065	goto done;
1066	}
1067
1068	next_listen:
1069	++num;
1070	}
1071	spin_unlock(lock: &ilb->lock);
1072
1073	s_num = 0;
1074	}
1075	skip_listen_ht:
1076	cb->args[0] = 1;
1077	s_i = num = s_num = 0;
1078	}
1079
1080	if (!(idiag_states & ~TCPF_LISTEN))
1081	goto out;
1082
1083	#define SKARR_SZ 16
1084	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1085	struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1086	spinlock_t *lock = inet_ehash_lockp(hashinfo, hash: i);
1087	struct hlist_nulls_node *node;
1088	struct sock *sk_arr[SKARR_SZ];
1089	int num_arr[SKARR_SZ];
1090	int idx, accum, res;
1091
1092	if (hlist_nulls_empty(h: &head->chain))
1093	continue;
1094
1095	if (i > s_i)
1096	s_num = 0;
1097
1098	next_chunk:
1099	num = 0;
1100	accum = 0;
1101	spin_lock_bh(lock);
1102	sk_nulls_for_each(sk, node, &head->chain) {
1103	int state;
1104
1105	if (!net_eq(net1: sock_net(sk), net2: net))
1106	continue;
1107	if (num < s_num)
1108	goto next_normal;
1109	state = (sk->sk_state == TCP_TIME_WAIT) ?
1110	inet_twsk(sk)->tw_substate : sk->sk_state;
1111	if (!(idiag_states & (1 << state)))
1112	goto next_normal;
1113	if (r->sdiag_family != AF_UNSPEC &&
1114	sk->sk_family != r->sdiag_family)
1115	goto next_normal;
1116	if (r->id.idiag_sport != htons(sk->sk_num) &&
1117	r->id.idiag_sport)
1118	goto next_normal;
1119	if (r->id.idiag_dport != sk->sk_dport &&
1120	r->id.idiag_dport)
1121	goto next_normal;
1122	twsk_build_assert();
1123
1124	if (!inet_diag_bc_sk(bc, sk))
1125	goto next_normal;
1126
1127	if (!refcount_inc_not_zero(r: &sk->sk_refcnt))
1128	goto next_normal;
1129
1130	num_arr[accum] = num;
1131	sk_arr[accum] = sk;
1132	if (++accum == SKARR_SZ)
1133	break;
1134	next_normal:
1135	++num;
1136	}
1137	spin_unlock_bh(lock);
1138	res = 0;
1139	for (idx = 0; idx < accum; idx++) {
1140	if (res >= 0) {
1141	res = sk_diag_fill(sk: sk_arr[idx], skb, cb, r,
1142	NLM_F_MULTI, net_admin);
1143	if (res < 0)
1144	num = num_arr[idx];
1145	}
1146	sock_gen_put(sk: sk_arr[idx]);
1147	}
1148	if (res < 0)
1149	break;
1150	cond_resched();
1151	if (accum == SKARR_SZ) {
1152	s_num = num + 1;
1153	goto next_chunk;
1154	}
1155	}
1156
1157	done:
1158	cb->args[1] = i;
1159	cb->args[2] = num;
1160	out:
1161	;
1162	}
1163	EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1164
1165	static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1166	const struct inet_diag_req_v2 *r)
1167	{
1168	struct inet_diag_dump_data *cb_data = cb->data;
1169	const struct inet_diag_handler *handler;
1170	u32 prev_min_dump_alloc;
1171	int protocol, err = 0;
1172
1173	protocol = inet_diag_get_protocol(req: r, data: cb_data);
1174
1175	again:
1176	prev_min_dump_alloc = cb->min_dump_alloc;
1177	handler = inet_diag_lock_handler(proto: protocol);
1178	if (!IS_ERR(ptr: handler))
1179	handler->dump(skb, cb, r);
1180	else
1181	err = PTR_ERR(ptr: handler);
1182	inet_diag_unlock_handler(handler);
1183
1184	/* The skb is not large enough to fit one sk info and
1185	* inet_sk_diag_fill() has requested for a larger skb.
1186	*/
1187	if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1188	err = pskb_expand_head(skb, nhead: 0, ntail: cb->min_dump_alloc, GFP_KERNEL);
1189	if (!err)
1190	goto again;
1191	}
1192
1193	return err ? : skb->len;
1194	}
1195
1196	static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1197	{
1198	return __inet_diag_dump(skb, cb, r: nlmsg_data(nlh: cb->nlh));
1199	}
1200
1201	static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1202	{
1203	const struct nlmsghdr *nlh = cb->nlh;
1204	struct inet_diag_dump_data *cb_data;
1205	struct sk_buff *skb = cb->skb;
1206	struct nlattr *nla;
1207	int err;
1208
1209	cb_data = kzalloc(size: sizeof(*cb_data), GFP_KERNEL);
1210	if (!cb_data)
1211	return -ENOMEM;
1212
1213	err = inet_diag_parse_attrs(nlh, hdrlen, req_nlas: cb_data->req_nlas);
1214	if (err) {
1215	kfree(objp: cb_data);
1216	return err;
1217	}
1218	nla = cb_data->inet_diag_nla_bc;
1219	if (nla) {
1220	err = inet_diag_bc_audit(attr: nla, skb);
1221	if (err) {
1222	kfree(objp: cb_data);
1223	return err;
1224	}
1225	}
1226
1227	nla = cb_data->inet_diag_nla_bpf_stgs;
1228	if (nla) {
1229	struct bpf_sk_storage_diag *bpf_stg_diag;
1230
1231	bpf_stg_diag = bpf_sk_storage_diag_alloc(nla_stgs: nla);
1232	if (IS_ERR(ptr: bpf_stg_diag)) {
1233	kfree(objp: cb_data);
1234	return PTR_ERR(ptr: bpf_stg_diag);
1235	}
1236	cb_data->bpf_stg_diag = bpf_stg_diag;
1237	}
1238
1239	cb->data = cb_data;
1240	return 0;
1241	}
1242
1243	static int inet_diag_dump_start(struct netlink_callback *cb)
1244	{
1245	return __inet_diag_dump_start(cb, hdrlen: sizeof(struct inet_diag_req_v2));
1246	}
1247
1248	static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1249	{
1250	return __inet_diag_dump_start(cb, hdrlen: sizeof(struct inet_diag_req));
1251	}
1252
1253	static int inet_diag_dump_done(struct netlink_callback *cb)
1254	{
1255	struct inet_diag_dump_data *cb_data = cb->data;
1256
1257	bpf_sk_storage_diag_free(diag: cb_data->bpf_stg_diag);
1258	kfree(objp: cb->data);
1259
1260	return 0;
1261	}
1262
1263	static int inet_diag_type2proto(int type)
1264	{
1265	switch (type) {
1266	case TCPDIAG_GETSOCK:
1267	return IPPROTO_TCP;
1268	case DCCPDIAG_GETSOCK:
1269	return IPPROTO_DCCP;
1270	default:
1271	return 0;
1272	}
1273	}
1274
1275	static int inet_diag_dump_compat(struct sk_buff *skb,
1276	struct netlink_callback *cb)
1277	{
1278	struct inet_diag_req *rc = nlmsg_data(nlh: cb->nlh);
1279	struct inet_diag_req_v2 req;
1280
1281	req.sdiag_family = AF_UNSPEC; /* compatibility */
1282	req.sdiag_protocol = inet_diag_type2proto(type: cb->nlh->nlmsg_type);
1283	req.idiag_ext = rc->idiag_ext;
1284	req.idiag_states = rc->idiag_states;
1285	req.id = rc->id;
1286
1287	return __inet_diag_dump(skb, cb, r: &req);
1288	}
1289
1290	static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1291	const struct nlmsghdr *nlh)
1292	{
1293	struct inet_diag_req *rc = nlmsg_data(nlh);
1294	struct inet_diag_req_v2 req;
1295
1296	req.sdiag_family = rc->idiag_family;
1297	req.sdiag_protocol = inet_diag_type2proto(type: nlh->nlmsg_type);
1298	req.idiag_ext = rc->idiag_ext;
1299	req.idiag_states = rc->idiag_states;
1300	req.id = rc->id;
1301
1302	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1303	hdrlen: sizeof(struct inet_diag_req), req: &req);
1304	}
1305
1306	static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1307	{
1308	int hdrlen = sizeof(struct inet_diag_req);
1309	struct net *net = sock_net(sk: skb->sk);
1310
1311	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1312	nlmsg_len(nlh) < hdrlen)
1313	return -EINVAL;
1314
1315	if (nlh->nlmsg_flags & NLM_F_DUMP) {
1316	struct netlink_dump_control c = {
1317	.start = inet_diag_dump_start_compat,
1318	.done = inet_diag_dump_done,
1319	.dump = inet_diag_dump_compat,
1320	};
1321	return netlink_dump_start(ssk: net->diag_nlsk, skb, nlh, control: &c);
1322	}
1323
1324	return inet_diag_get_exact_compat(in_skb: skb, nlh);
1325	}
1326
1327	static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1328	{
1329	int hdrlen = sizeof(struct inet_diag_req_v2);
1330	struct net *net = sock_net(sk: skb->sk);
1331
1332	if (nlmsg_len(nlh: h) < hdrlen)
1333	return -EINVAL;
1334
1335	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1336	h->nlmsg_flags & NLM_F_DUMP) {
1337	struct netlink_dump_control c = {
1338	.start = inet_diag_dump_start,
1339	.done = inet_diag_dump_done,
1340	.dump = inet_diag_dump,
1341	};
1342	return netlink_dump_start(ssk: net->diag_nlsk, skb, nlh: h, control: &c);
1343	}
1344
1345	return inet_diag_cmd_exact(cmd: h->nlmsg_type, in_skb: skb, nlh: h, hdrlen,
1346	req: nlmsg_data(nlh: h));
1347	}
1348
1349	static
1350	int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1351	{
1352	const struct inet_diag_handler *handler;
1353	struct nlmsghdr *nlh;
1354	struct nlattr *attr;
1355	struct inet_diag_msg *r;
1356	void *info = NULL;
1357	int err = 0;
1358
1359	nlh = nlmsg_put(skb, portid: 0, seq: 0, SOCK_DIAG_BY_FAMILY, payload: sizeof(*r), flags: 0);
1360	if (!nlh)
1361	return -ENOMEM;
1362
1363	r = nlmsg_data(nlh);
1364	memset(r, 0, sizeof(*r));
1365	inet_diag_msg_common_fill(r, sk);
1366	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1367	r->id.idiag_sport = inet_sk(sk)->inet_sport;
1368	r->idiag_state = sk->sk_state;
1369
1370	if ((err = nla_put_u8(skb, attrtype: INET_DIAG_PROTOCOL, value: sk->sk_protocol))) {
1371	nlmsg_cancel(skb, nlh);
1372	return err;
1373	}
1374
1375	handler = inet_diag_lock_handler(proto: sk->sk_protocol);
1376	if (IS_ERR(ptr: handler)) {
1377	inet_diag_unlock_handler(handler);
1378	nlmsg_cancel(skb, nlh);
1379	return PTR_ERR(ptr: handler);
1380	}
1381
1382	attr = handler->idiag_info_size
1383	? nla_reserve_64bit(skb, attrtype: INET_DIAG_INFO,
1384	attrlen: handler->idiag_info_size,
1385	padattr: INET_DIAG_PAD)
1386	: NULL;
1387	if (attr)
1388	info = nla_data(nla: attr);
1389
1390	handler->idiag_get_info(sk, r, info);
1391	inet_diag_unlock_handler(handler);
1392
1393	nlmsg_end(skb, nlh);
1394	return 0;
1395	}
1396
1397	static const struct sock_diag_handler inet_diag_handler = {
1398	.family = AF_INET,
1399	.dump = inet_diag_handler_cmd,
1400	.get_info = inet_diag_handler_get_info,
1401	.destroy = inet_diag_handler_cmd,
1402	};
1403
1404	static const struct sock_diag_handler inet6_diag_handler = {
1405	.family = AF_INET6,
1406	.dump = inet_diag_handler_cmd,
1407	.get_info = inet_diag_handler_get_info,
1408	.destroy = inet_diag_handler_cmd,
1409	};
1410
1411	int inet_diag_register(const struct inet_diag_handler *h)
1412	{
1413	const __u16 type = h->idiag_type;
1414	int err = -EINVAL;
1415
1416	if (type >= IPPROTO_MAX)
1417	goto out;
1418
1419	mutex_lock(&inet_diag_table_mutex);
1420	err = -EEXIST;
1421	if (!inet_diag_table[type]) {
1422	inet_diag_table[type] = h;
1423	err = 0;
1424	}
1425	mutex_unlock(lock: &inet_diag_table_mutex);
1426	out:
1427	return err;
1428	}
1429	EXPORT_SYMBOL_GPL(inet_diag_register);
1430
1431	void inet_diag_unregister(const struct inet_diag_handler *h)
1432	{
1433	const __u16 type = h->idiag_type;
1434
1435	if (type >= IPPROTO_MAX)
1436	return;
1437
1438	mutex_lock(&inet_diag_table_mutex);
1439	inet_diag_table[type] = NULL;
1440	mutex_unlock(lock: &inet_diag_table_mutex);
1441	}
1442	EXPORT_SYMBOL_GPL(inet_diag_unregister);
1443
1444	static int __init inet_diag_init(void)
1445	{
1446	const int inet_diag_table_size = (IPPROTO_MAX *
1447	sizeof(struct inet_diag_handler *));
1448	int err = -ENOMEM;
1449
1450	inet_diag_table = kzalloc(size: inet_diag_table_size, GFP_KERNEL);
1451	if (!inet_diag_table)
1452	goto out;
1453
1454	err = sock_diag_register(h: &inet_diag_handler);
1455	if (err)
1456	goto out_free_nl;
1457
1458	err = sock_diag_register(h: &inet6_diag_handler);
1459	if (err)
1460	goto out_free_inet;
1461
1462	sock_diag_register_inet_compat(fn: inet_diag_rcv_msg_compat);
1463	out:
1464	return err;
1465
1466	out_free_inet:
1467	sock_diag_unregister(h: &inet_diag_handler);
1468	out_free_nl:
1469	kfree(objp: inet_diag_table);
1470	goto out;
1471	}
1472
1473	static void __exit inet_diag_exit(void)
1474	{
1475	sock_diag_unregister(h: &inet6_diag_handler);
1476	sock_diag_unregister(h: &inet_diag_handler);
1477	sock_diag_unregister_inet_compat(fn: inet_diag_rcv_msg_compat);
1478	kfree(objp: inet_diag_table);
1479	}
1480
1481	module_init(inet_diag_init);
1482	module_exit(inet_diag_exit);
1483	MODULE_LICENSE("GPL");
1484	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1485	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1486