1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	* linux/net/sunrpc/xprtsock.c
4	*
5	* Client-side transport implementation for sockets.
6	*
7	* TCP callback races fixes (C) 1998 Red Hat
8	* TCP send fixes (C) 1998 Red Hat
9	* TCP NFS related read + write fixes
10	* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11	*
12	* Rewrite of larges part of the code in order to stabilize TCP stuff.
13	* Fix behaviour when socket buffer is full.
14	* (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15	*
16	* IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17	*
18	* IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19	* <gilles.quillard@bull.net>
20	*/
21
22	#include <linux/types.h>
23	#include <linux/string.h>
24	#include <linux/slab.h>
25	#include <linux/module.h>
26	#include <linux/capability.h>
27	#include <linux/pagemap.h>
28	#include <linux/errno.h>
29	#include <linux/socket.h>
30	#include <linux/in.h>
31	#include <linux/net.h>
32	#include <linux/mm.h>
33	#include <linux/un.h>
34	#include <linux/udp.h>
35	#include <linux/tcp.h>
36	#include <linux/sunrpc/clnt.h>
37	#include <linux/sunrpc/addr.h>
38	#include <linux/sunrpc/sched.h>
39	#include <linux/sunrpc/svcsock.h>
40	#include <linux/sunrpc/xprtsock.h>
41	#include <linux/file.h>
42	#ifdef CONFIG_SUNRPC_BACKCHANNEL
43	#include <linux/sunrpc/bc_xprt.h>
44	#endif
45
46	#include <net/sock.h>
47	#include <net/checksum.h>
48	#include <net/udp.h>
49	#include <net/tcp.h>
50	#include <net/tls_prot.h>
51	#include <net/handshake.h>
52
53	#include <linux/bvec.h>
54	#include <linux/highmem.h>
55	#include <linux/uio.h>
56	#include <linux/sched/mm.h>
57
58	#include <trace/events/sock.h>
59	#include <trace/events/sunrpc.h>
60
61	#include "socklib.h"
62	#include "sunrpc.h"
63
64	static void xs_close(struct rpc_xprt *xprt);
65	static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
66	static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
67	struct socket *sock);
68
69	/*
70	* xprtsock tunables
71	*/
72	static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
73	static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
74	static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
75
76	static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
77	static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
78
79	#define XS_TCP_LINGER_TO (15U * HZ)
80	static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
81
82	/*
83	* We can register our own files under /proc/sys/sunrpc by
84	* calling register_sysctl() again. The files in that
85	* directory become the union of all files registered there.
86	*
87	* We simply need to make sure that we don't collide with
88	* someone else's file names!
89	*/
90
91	static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
92	static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
93	static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
94	static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
95	static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
96
97	static struct ctl_table_header *sunrpc_table_header;
98
99	static struct xprt_class xs_local_transport;
100	static struct xprt_class xs_udp_transport;
101	static struct xprt_class xs_tcp_transport;
102	static struct xprt_class xs_tcp_tls_transport;
103	static struct xprt_class xs_bc_tcp_transport;
104
105	/*
106	* FIXME: changing the UDP slot table size should also resize the UDP
107	* socket buffers for existing UDP transports
108	*/
109	static struct ctl_table xs_tunables_table[] = {
110	{
111	.procname = "udp_slot_table_entries",
112	.data = &xprt_udp_slot_table_entries,
113	.maxlen = sizeof(unsigned int),
114	.mode = 0644,
115	.proc_handler = proc_dointvec_minmax,
116	.extra1 = &min_slot_table_size,
117	.extra2 = &max_slot_table_size
118	},
119	{
120	.procname = "tcp_slot_table_entries",
121	.data = &xprt_tcp_slot_table_entries,
122	.maxlen = sizeof(unsigned int),
123	.mode = 0644,
124	.proc_handler = proc_dointvec_minmax,
125	.extra1 = &min_slot_table_size,
126	.extra2 = &max_slot_table_size
127	},
128	{
129	.procname = "tcp_max_slot_table_entries",
130	.data = &xprt_max_tcp_slot_table_entries,
131	.maxlen = sizeof(unsigned int),
132	.mode = 0644,
133	.proc_handler = proc_dointvec_minmax,
134	.extra1 = &min_slot_table_size,
135	.extra2 = &max_tcp_slot_table_limit
136	},
137	{
138	.procname = "min_resvport",
139	.data = &xprt_min_resvport,
140	.maxlen = sizeof(unsigned int),
141	.mode = 0644,
142	.proc_handler = proc_dointvec_minmax,
143	.extra1 = &xprt_min_resvport_limit,
144	.extra2 = &xprt_max_resvport_limit
145	},
146	{
147	.procname = "max_resvport",
148	.data = &xprt_max_resvport,
149	.maxlen = sizeof(unsigned int),
150	.mode = 0644,
151	.proc_handler = proc_dointvec_minmax,
152	.extra1 = &xprt_min_resvport_limit,
153	.extra2 = &xprt_max_resvport_limit
154	},
155	{
156	.procname = "tcp_fin_timeout",
157	.data = &xs_tcp_fin_timeout,
158	.maxlen = sizeof(xs_tcp_fin_timeout),
159	.mode = 0644,
160	.proc_handler = proc_dointvec_jiffies,
161	},
162	{ },
163	};
164
165	/*
166	* Wait duration for a reply from the RPC portmapper.
167	*/
168	#define XS_BIND_TO (60U * HZ)
169
170	/*
171	* Delay if a UDP socket connect error occurs. This is most likely some
172	* kind of resource problem on the local host.
173	*/
174	#define XS_UDP_REEST_TO (2U * HZ)
175
176	/*
177	* The reestablish timeout allows clients to delay for a bit before attempting
178	* to reconnect to a server that just dropped our connection.
179	*
180	* We implement an exponential backoff when trying to reestablish a TCP
181	* transport connection with the server. Some servers like to drop a TCP
182	* connection when they are overworked, so we start with a short timeout and
183	* increase over time if the server is down or not responding.
184	*/
185	#define XS_TCP_INIT_REEST_TO (3U * HZ)
186
187	/*
188	* TCP idle timeout; client drops the transport socket if it is idle
189	* for this long. Note that we also timeout UDP sockets to prevent
190	* holding port numbers when there is no RPC traffic.
191	*/
192	#define XS_IDLE_DISC_TO (5U * 60 * HZ)
193
194	/*
195	* TLS handshake timeout.
196	*/
197	#define XS_TLS_HANDSHAKE_TO (10U * HZ)
198
199	#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
200	# undef RPC_DEBUG_DATA
201	# define RPCDBG_FACILITY RPCDBG_TRANS
202	#endif
203
204	#ifdef RPC_DEBUG_DATA
205	static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
206	{
207	u8 *buf = (u8 *) packet;
208	int j;
209
210	dprintk("RPC: %s\n", msg);
211	for (j = 0; j < count && j < 128; j += 4) {
212	if (!(j & 31)) {
213	if (j)
214	dprintk("\n");
215	dprintk("0x%04x ", j);
216	}
217	dprintk("%02x%02x%02x%02x ",
218	buf[j], buf[j+1], buf[j+2], buf[j+3]);
219	}
220	dprintk("\n");
221	}
222	#else
223	static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
224	{
225	/* NOP */
226	}
227	#endif
228
229	static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
230	{
231	return (struct rpc_xprt *) sk->sk_user_data;
232	}
233
234	static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
235	{
236	return (struct sockaddr *) &xprt->addr;
237	}
238
239	static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
240	{
241	return (struct sockaddr_un *) &xprt->addr;
242	}
243
244	static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
245	{
246	return (struct sockaddr_in *) &xprt->addr;
247	}
248
249	static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
250	{
251	return (struct sockaddr_in6 *) &xprt->addr;
252	}
253
254	static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
255	{
256	struct sockaddr *sap = xs_addr(xprt);
257	struct sockaddr_in6 *sin6;
258	struct sockaddr_in *sin;
259	struct sockaddr_un *sun;
260	char buf[128];
261
262	switch (sap->sa_family) {
263	case AF_LOCAL:
264	sun = xs_addr_un(xprt);
265	if (sun->sun_path[0]) {
266	strscpy(p: buf, q: sun->sun_path, size: sizeof(buf));
267	} else {
268	buf[0] = '@';
269	strscpy(p: buf+1, q: sun->sun_path+1, size: sizeof(buf)-1);
270	}
271	xprt->address_strings[RPC_DISPLAY_ADDR] =
272	kstrdup(s: buf, GFP_KERNEL);
273	break;
274	case AF_INET:
275	(void)rpc_ntop(sap, buf, sizeof(buf));
276	xprt->address_strings[RPC_DISPLAY_ADDR] =
277	kstrdup(s: buf, GFP_KERNEL);
278	sin = xs_addr_in(xprt);
279	snprintf(buf, size: sizeof(buf), fmt: "%08x", ntohl(sin->sin_addr.s_addr));
280	break;
281	case AF_INET6:
282	(void)rpc_ntop(sap, buf, sizeof(buf));
283	xprt->address_strings[RPC_DISPLAY_ADDR] =
284	kstrdup(s: buf, GFP_KERNEL);
285	sin6 = xs_addr_in6(xprt);
286	snprintf(buf, size: sizeof(buf), fmt: "%pi6", &sin6->sin6_addr);
287	break;
288	default:
289	BUG();
290	}
291
292	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(s: buf, GFP_KERNEL);
293	}
294
295	static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
296	{
297	struct sockaddr *sap = xs_addr(xprt);
298	char buf[128];
299
300	snprintf(buf, size: sizeof(buf), fmt: "%u", rpc_get_port(sap));
301	xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(s: buf, GFP_KERNEL);
302
303	snprintf(buf, size: sizeof(buf), fmt: "%4hx", rpc_get_port(sap));
304	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(s: buf, GFP_KERNEL);
305	}
306
307	static void xs_format_peer_addresses(struct rpc_xprt *xprt,
308	const char *protocol,
309	const char *netid)
310	{
311	xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
312	xprt->address_strings[RPC_DISPLAY_NETID] = netid;
313	xs_format_common_peer_addresses(xprt);
314	xs_format_common_peer_ports(xprt);
315	}
316
317	static void xs_update_peer_port(struct rpc_xprt *xprt)
318	{
319	kfree(objp: xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
320	kfree(objp: xprt->address_strings[RPC_DISPLAY_PORT]);
321
322	xs_format_common_peer_ports(xprt);
323	}
324
325	static void xs_free_peer_addresses(struct rpc_xprt *xprt)
326	{
327	unsigned int i;
328
329	for (i = 0; i < RPC_DISPLAY_MAX; i++)
330	switch (i) {
331	case RPC_DISPLAY_PROTO:
332	case RPC_DISPLAY_NETID:
333	continue;
334	default:
335	kfree(objp: xprt->address_strings[i]);
336	}
337	}
338
339	static size_t
340	xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
341	{
342	size_t i,n;
343
344	if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
345	return want;
346	n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
347	for (i = 0; i < n; i++) {
348	if (buf->pages[i])
349	continue;
350	buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
351	if (!buf->pages[i]) {
352	i *= PAGE_SIZE;
353	return i > buf->page_base ? i - buf->page_base : 0;
354	}
355	}
356	return want;
357	}
358
359	static int
360	xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
361	struct cmsghdr *cmsg, int ret)
362	{
363	u8 content_type = tls_get_record_type(sk: sock->sk, msg: cmsg);
364	u8 level, description;
365
366	switch (content_type) {
367	case 0:
368	break;
369	case TLS_RECORD_TYPE_DATA:
370	/* TLS sets EOR at the end of each application data
371	* record, even though there might be more frames
372	* waiting to be decrypted.
373	*/
374	msg->msg_flags &= ~MSG_EOR;
375	break;
376	case TLS_RECORD_TYPE_ALERT:
377	tls_alert_recv(sk: sock->sk, msg, level: &level, description: &description);
378	ret = (level == TLS_ALERT_LEVEL_FATAL) ?
379	-EACCES : -EAGAIN;
380	break;
381	default:
382	/* discard this record type */
383	ret = -EAGAIN;
384	}
385	return ret;
386	}
387
388	static int
389	xs_sock_recv_cmsg(struct socket *sock, struct msghdr *msg, int flags)
390	{
391	union {
392	struct cmsghdr cmsg;
393	u8 buf[CMSG_SPACE(sizeof(u8))];
394	} u;
395	int ret;
396
397	msg->msg_control = &u;
398	msg->msg_controllen = sizeof(u);
399	ret = sock_recvmsg(sock, msg, flags);
400	if (msg->msg_controllen != sizeof(u))
401	ret = xs_sock_process_cmsg(sock, msg, cmsg: &u.cmsg, ret);
402	return ret;
403	}
404
405	static ssize_t
406	xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
407	{
408	ssize_t ret;
409	if (seek != 0)
410	iov_iter_advance(i: &msg->msg_iter, bytes: seek);
411	ret = xs_sock_recv_cmsg(sock, msg, flags);
412	return ret > 0 ? ret + seek : ret;
413	}
414
415	static ssize_t
416	xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
417	struct kvec *kvec, size_t count, size_t seek)
418	{
419	iov_iter_kvec(i: &msg->msg_iter, ITER_DEST, kvec, nr_segs: 1, count);
420	return xs_sock_recvmsg(sock, msg, flags, seek);
421	}
422
423	static ssize_t
424	xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
425	struct bio_vec *bvec, unsigned long nr, size_t count,
426	size_t seek)
427	{
428	iov_iter_bvec(i: &msg->msg_iter, ITER_DEST, bvec, nr_segs: nr, count);
429	return xs_sock_recvmsg(sock, msg, flags, seek);
430	}
431
432	static ssize_t
433	xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
434	size_t count)
435	{
436	iov_iter_discard(i: &msg->msg_iter, ITER_DEST, count);
437	return xs_sock_recv_cmsg(sock, msg, flags);
438	}
439
440	#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
441	static void
442	xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
443	{
444	struct bvec_iter bi = {
445	.bi_size = count,
446	};
447	struct bio_vec bv;
448
449	bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
450	for_each_bvec(bv, bvec, bi, bi)
451	flush_dcache_page(bv.bv_page);
452	}
453	#else
454	static inline void
455	xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
456	{
457	}
458	#endif
459
460	static ssize_t
461	xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
462	struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
463	{
464	size_t want, seek_init = seek, offset = 0;
465	ssize_t ret;
466
467	want = min_t(size_t, count, buf->head[0].iov_len);
468	if (seek < want) {
469	ret = xs_read_kvec(sock, msg, flags, kvec: &buf->head[0], count: want, seek);
470	if (ret <= 0)
471	goto sock_err;
472	offset += ret;
473	if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
474	goto out;
475	if (ret != want)
476	goto out;
477	seek = 0;
478	} else {
479	seek -= want;
480	offset += want;
481	}
482
483	want = xs_alloc_sparse_pages(
484	buf, min_t(size_t, count - offset, buf->page_len),
485	GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
486	if (seek < want) {
487	ret = xs_read_bvec(sock, msg, flags, bvec: buf->bvec,
488	nr: xdr_buf_pagecount(buf),
489	count: want + buf->page_base,
490	seek: seek + buf->page_base);
491	if (ret <= 0)
492	goto sock_err;
493	xs_flush_bvec(bvec: buf->bvec, count: ret, seek: seek + buf->page_base);
494	ret -= buf->page_base;
495	offset += ret;
496	if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
497	goto out;
498	if (ret != want)
499	goto out;
500	seek = 0;
501	} else {
502	seek -= want;
503	offset += want;
504	}
505
506	want = min_t(size_t, count - offset, buf->tail[0].iov_len);
507	if (seek < want) {
508	ret = xs_read_kvec(sock, msg, flags, kvec: &buf->tail[0], count: want, seek);
509	if (ret <= 0)
510	goto sock_err;
511	offset += ret;
512	if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
513	goto out;
514	if (ret != want)
515	goto out;
516	} else if (offset < seek_init)
517	offset = seek_init;
518	ret = -EMSGSIZE;
519	out:
520	*read = offset - seek_init;
521	return ret;
522	sock_err:
523	offset += seek;
524	goto out;
525	}
526
527	static void
528	xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
529	{
530	if (!transport->recv.copied) {
531	if (buf->head[0].iov_len >= transport->recv.offset)
532	memcpy(buf->head[0].iov_base,
533	&transport->recv.xid,
534	transport->recv.offset);
535	transport->recv.copied = transport->recv.offset;
536	}
537	}
538
539	static bool
540	xs_read_stream_request_done(struct sock_xprt *transport)
541	{
542	return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
543	}
544
545	static void
546	xs_read_stream_check_eor(struct sock_xprt *transport,
547	struct msghdr *msg)
548	{
549	if (xs_read_stream_request_done(transport))
550	msg->msg_flags |= MSG_EOR;
551	}
552
553	static ssize_t
554	xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
555	int flags, struct rpc_rqst *req)
556	{
557	struct xdr_buf *buf = &req->rq_private_buf;
558	size_t want, read;
559	ssize_t ret;
560
561	xs_read_header(transport, buf);
562
563	want = transport->recv.len - transport->recv.offset;
564	if (want != 0) {
565	ret = xs_read_xdr_buf(sock: transport->sock, msg, flags, buf,
566	count: transport->recv.copied + want,
567	seek: transport->recv.copied,
568	read: &read);
569	transport->recv.offset += read;
570	transport->recv.copied += read;
571	}
572
573	if (transport->recv.offset == transport->recv.len)
574	xs_read_stream_check_eor(transport, msg);
575
576	if (want == 0)
577	return 0;
578
579	switch (ret) {
580	default:
581	break;
582	case -EFAULT:
583	case -EMSGSIZE:
584	msg->msg_flags |= MSG_TRUNC;
585	return read;
586	case 0:
587	return -ESHUTDOWN;
588	}
589	return ret < 0 ? ret : read;
590	}
591
592	static size_t
593	xs_read_stream_headersize(bool isfrag)
594	{
595	if (isfrag)
596	return sizeof(__be32);
597	return 3 * sizeof(__be32);
598	}
599
600	static ssize_t
601	xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
602	int flags, size_t want, size_t seek)
603	{
604	struct kvec kvec = {
605	.iov_base = &transport->recv.fraghdr,
606	.iov_len = want,
607	};
608	return xs_read_kvec(sock: transport->sock, msg, flags, kvec: &kvec, count: want, seek);
609	}
610
611	#if defined(CONFIG_SUNRPC_BACKCHANNEL)
612	static ssize_t
613	xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
614	{
615	struct rpc_xprt *xprt = &transport->xprt;
616	struct rpc_rqst *req;
617	ssize_t ret;
618
619	/* Is this transport associated with the backchannel? */
620	if (!xprt->bc_serv)
621	return -ESHUTDOWN;
622
623	/* Look up and lock the request corresponding to the given XID */
624	req = xprt_lookup_bc_request(xprt, xid: transport->recv.xid);
625	if (!req) {
626	printk(KERN_WARNING "Callback slot table overflowed\n");
627	return -ESHUTDOWN;
628	}
629	if (transport->recv.copied && !req->rq_private_buf.len)
630	return -ESHUTDOWN;
631
632	ret = xs_read_stream_request(transport, msg, flags, req);
633	if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
634	xprt_complete_bc_request(req, copied: transport->recv.copied);
635	else
636	req->rq_private_buf.len = transport->recv.copied;
637
638	return ret;
639	}
640	#else /* CONFIG_SUNRPC_BACKCHANNEL */
641	static ssize_t
642	xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
643	{
644	return -ESHUTDOWN;
645	}
646	#endif /* CONFIG_SUNRPC_BACKCHANNEL */
647
648	static ssize_t
649	xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
650	{
651	struct rpc_xprt *xprt = &transport->xprt;
652	struct rpc_rqst *req;
653	ssize_t ret = 0;
654
655	/* Look up and lock the request corresponding to the given XID */
656	spin_lock(lock: &xprt->queue_lock);
657	req = xprt_lookup_rqst(xprt, xid: transport->recv.xid);
658	if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
659	msg->msg_flags |= MSG_TRUNC;
660	goto out;
661	}
662	xprt_pin_rqst(req);
663	spin_unlock(lock: &xprt->queue_lock);
664
665	ret = xs_read_stream_request(transport, msg, flags, req);
666
667	spin_lock(lock: &xprt->queue_lock);
668	if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
669	xprt_complete_rqst(task: req->rq_task, copied: transport->recv.copied);
670	else
671	req->rq_private_buf.len = transport->recv.copied;
672	xprt_unpin_rqst(req);
673	out:
674	spin_unlock(lock: &xprt->queue_lock);
675	return ret;
676	}
677
678	static ssize_t
679	xs_read_stream(struct sock_xprt *transport, int flags)
680	{
681	struct msghdr msg = { 0 };
682	size_t want, read = 0;
683	ssize_t ret = 0;
684
685	if (transport->recv.len == 0) {
686	want = xs_read_stream_headersize(isfrag: transport->recv.copied != 0);
687	ret = xs_read_stream_header(transport, msg: &msg, flags, want,
688	seek: transport->recv.offset);
689	if (ret <= 0)
690	goto out_err;
691	transport->recv.offset = ret;
692	if (transport->recv.offset != want)
693	return transport->recv.offset;
694	transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
695	RPC_FRAGMENT_SIZE_MASK;
696	transport->recv.offset -= sizeof(transport->recv.fraghdr);
697	read = ret;
698	}
699
700	switch (be32_to_cpu(transport->recv.calldir)) {
701	default:
702	msg.msg_flags |= MSG_TRUNC;
703	break;
704	case RPC_CALL:
705	ret = xs_read_stream_call(transport, msg: &msg, flags);
706	break;
707	case RPC_REPLY:
708	ret = xs_read_stream_reply(transport, msg: &msg, flags);
709	}
710	if (msg.msg_flags & MSG_TRUNC) {
711	transport->recv.calldir = cpu_to_be32(-1);
712	transport->recv.copied = -1;
713	}
714	if (ret < 0)
715	goto out_err;
716	read += ret;
717	if (transport->recv.offset < transport->recv.len) {
718	if (!(msg.msg_flags & MSG_TRUNC))
719	return read;
720	msg.msg_flags = 0;
721	ret = xs_read_discard(sock: transport->sock, msg: &msg, flags,
722	count: transport->recv.len - transport->recv.offset);
723	if (ret <= 0)
724	goto out_err;
725	transport->recv.offset += ret;
726	read += ret;
727	if (transport->recv.offset != transport->recv.len)
728	return read;
729	}
730	if (xs_read_stream_request_done(transport)) {
731	trace_xs_stream_read_request(xs: transport);
732	transport->recv.copied = 0;
733	}
734	transport->recv.offset = 0;
735	transport->recv.len = 0;
736	return read;
737	out_err:
738	return ret != 0 ? ret : -ESHUTDOWN;
739	}
740
741	static __poll_t xs_poll_socket(struct sock_xprt *transport)
742	{
743	return transport->sock->ops->poll(transport->file, transport->sock,
744	NULL);
745	}
746
747	static bool xs_poll_socket_readable(struct sock_xprt *transport)
748	{
749	__poll_t events = xs_poll_socket(transport);
750
751	return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
752	}
753
754	static void xs_poll_check_readable(struct sock_xprt *transport)
755	{
756
757	clear_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state);
758	if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
759	return;
760	if (!xs_poll_socket_readable(transport))
761	return;
762	if (!test_and_set_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state))
763	queue_work(wq: xprtiod_workqueue, work: &transport->recv_worker);
764	}
765
766	static void xs_stream_data_receive(struct sock_xprt *transport)
767	{
768	size_t read = 0;
769	ssize_t ret = 0;
770
771	mutex_lock(&transport->recv_mutex);
772	if (transport->sock == NULL)
773	goto out;
774	for (;;) {
775	ret = xs_read_stream(transport, MSG_DONTWAIT);
776	if (ret < 0)
777	break;
778	read += ret;
779	cond_resched();
780	}
781	if (ret == -ESHUTDOWN)
782	kernel_sock_shutdown(sock: transport->sock, how: SHUT_RDWR);
783	else if (ret == -EACCES)
784	xprt_wake_pending_tasks(xprt: &transport->xprt, status: -EACCES);
785	else
786	xs_poll_check_readable(transport);
787	out:
788	mutex_unlock(lock: &transport->recv_mutex);
789	trace_xs_stream_read_data(xprt: &transport->xprt, err: ret, total: read);
790	}
791
792	static void xs_stream_data_receive_workfn(struct work_struct *work)
793	{
794	struct sock_xprt *transport =
795	container_of(work, struct sock_xprt, recv_worker);
796	unsigned int pflags = memalloc_nofs_save();
797
798	xs_stream_data_receive(transport);
799	memalloc_nofs_restore(flags: pflags);
800	}
801
802	static void
803	xs_stream_reset_connect(struct sock_xprt *transport)
804	{
805	transport->recv.offset = 0;
806	transport->recv.len = 0;
807	transport->recv.copied = 0;
808	transport->xmit.offset = 0;
809	}
810
811	static void
812	xs_stream_start_connect(struct sock_xprt *transport)
813	{
814	transport->xprt.stat.connect_count++;
815	transport->xprt.stat.connect_start = jiffies;
816	}
817
818	#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
819
820	/**
821	* xs_nospace - handle transmit was incomplete
822	* @req: pointer to RPC request
823	* @transport: pointer to struct sock_xprt
824	*
825	*/
826	static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
827	{
828	struct rpc_xprt *xprt = &transport->xprt;
829	struct sock *sk = transport->inet;
830	int ret = -EAGAIN;
831
832	trace_rpc_socket_nospace(rqst: req, transport);
833
834	/* Protect against races with write_space */
835	spin_lock(lock: &xprt->transport_lock);
836
837	/* Don't race with disconnect */
838	if (xprt_connected(xprt)) {
839	/* wait for more buffer space */
840	set_bit(XPRT_SOCK_NOSPACE, addr: &transport->sock_state);
841	set_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags);
842	sk->sk_write_pending++;
843	xprt_wait_for_buffer_space(xprt);
844	} else
845	ret = -ENOTCONN;
846
847	spin_unlock(lock: &xprt->transport_lock);
848	return ret;
849	}
850
851	static int xs_sock_nospace(struct rpc_rqst *req)
852	{
853	struct sock_xprt *transport =
854	container_of(req->rq_xprt, struct sock_xprt, xprt);
855	struct sock *sk = transport->inet;
856	int ret = -EAGAIN;
857
858	lock_sock(sk);
859	if (!sock_writeable(sk))
860	ret = xs_nospace(req, transport);
861	release_sock(sk);
862	return ret;
863	}
864
865	static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
866	{
867	struct sock_xprt *transport =
868	container_of(req->rq_xprt, struct sock_xprt, xprt);
869	struct sock *sk = transport->inet;
870	int ret = -EAGAIN;
871
872	if (vm_wait)
873	return -ENOBUFS;
874	lock_sock(sk);
875	if (!sk_stream_memory_free(sk))
876	ret = xs_nospace(req, transport);
877	release_sock(sk);
878	return ret;
879	}
880
881	static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
882	{
883	return xdr_alloc_bvec(buf, gfp: rpc_task_gfp_mask());
884	}
885
886	/*
887	* Determine if the previous message in the stream was aborted before it
888	* could complete transmission.
889	*/
890	static bool
891	xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
892	{
893	return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
894	}
895
896	/*
897	* Return the stream record marker field for a record of length < 2^31-1
898	*/
899	static rpc_fraghdr
900	xs_stream_record_marker(struct xdr_buf *xdr)
901	{
902	if (!xdr->len)
903	return 0;
904	return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
905	}
906
907	/**
908	* xs_local_send_request - write an RPC request to an AF_LOCAL socket
909	* @req: pointer to RPC request
910	*
911	* Return values:
912	* 0: The request has been sent
913	* EAGAIN: The socket was blocked, please call again later to
914	* complete the request
915	* ENOTCONN: Caller needs to invoke connect logic then call again
916	* other: Some other error occurred, the request was not sent
917	*/
918	static int xs_local_send_request(struct rpc_rqst *req)
919	{
920	struct rpc_xprt *xprt = req->rq_xprt;
921	struct sock_xprt *transport =
922	container_of(xprt, struct sock_xprt, xprt);
923	struct xdr_buf *xdr = &req->rq_snd_buf;
924	rpc_fraghdr rm = xs_stream_record_marker(xdr);
925	unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
926	struct msghdr msg = {
927	.msg_flags = XS_SENDMSG_FLAGS,
928	};
929	bool vm_wait;
930	unsigned int sent;
931	int status;
932
933	/* Close the stream if the previous transmission was incomplete */
934	if (xs_send_request_was_aborted(transport, req)) {
935	xprt_force_disconnect(xprt);
936	return -ENOTCONN;
937	}
938
939	xs_pktdump(msg: "packet data:",
940	packet: req->rq_svec->iov_base, count: req->rq_svec->iov_len);
941
942	vm_wait = sk_stream_is_writeable(sk: transport->inet) ? true : false;
943
944	req->rq_xtime = ktime_get();
945	status = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr,
946	base: transport->xmit.offset, marker: rm, sent_p: &sent);
947	dprintk("RPC: %s(%u) = %d\n",
948	__func__, xdr->len - transport->xmit.offset, status);
949
950	if (likely(sent > 0) || status == 0) {
951	transport->xmit.offset += sent;
952	req->rq_bytes_sent = transport->xmit.offset;
953	if (likely(req->rq_bytes_sent >= msglen)) {
954	req->rq_xmit_bytes_sent += transport->xmit.offset;
955	transport->xmit.offset = 0;
956	return 0;
957	}
958	status = -EAGAIN;
959	vm_wait = false;
960	}
961
962	switch (status) {
963	case -EAGAIN:
964	status = xs_stream_nospace(req, vm_wait);
965	break;
966	default:
967	dprintk("RPC: sendmsg returned unrecognized error %d\n",
968	-status);
969	fallthrough;
970	case -EPIPE:
971	xprt_force_disconnect(xprt);
972	status = -ENOTCONN;
973	}
974
975	return status;
976	}
977
978	/**
979	* xs_udp_send_request - write an RPC request to a UDP socket
980	* @req: pointer to RPC request
981	*
982	* Return values:
983	* 0: The request has been sent
984	* EAGAIN: The socket was blocked, please call again later to
985	* complete the request
986	* ENOTCONN: Caller needs to invoke connect logic then call again
987	* other: Some other error occurred, the request was not sent
988	*/
989	static int xs_udp_send_request(struct rpc_rqst *req)
990	{
991	struct rpc_xprt *xprt = req->rq_xprt;
992	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
993	struct xdr_buf *xdr = &req->rq_snd_buf;
994	struct msghdr msg = {
995	.msg_name = xs_addr(xprt),
996	.msg_namelen = xprt->addrlen,
997	.msg_flags = XS_SENDMSG_FLAGS,
998	};
999	unsigned int sent;
1000	int status;
1001
1002	xs_pktdump(msg: "packet data:",
1003	packet: req->rq_svec->iov_base,
1004	count: req->rq_svec->iov_len);
1005
1006	if (!xprt_bound(xprt))
1007	return -ENOTCONN;
1008
1009	if (!xprt_request_get_cong(xprt, req))
1010	return -EBADSLT;
1011
1012	status = xdr_alloc_bvec(buf: xdr, gfp: rpc_task_gfp_mask());
1013	if (status < 0)
1014	return status;
1015	req->rq_xtime = ktime_get();
1016	status = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr, base: 0, marker: 0, sent_p: &sent);
1017
1018	dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1019	xdr->len, status);
1020
1021	/* firewall is blocking us, don't return -EAGAIN or we end up looping */
1022	if (status == -EPERM)
1023	goto process_status;
1024
1025	if (status == -EAGAIN && sock_writeable(sk: transport->inet))
1026	status = -ENOBUFS;
1027
1028	if (sent > 0 || status == 0) {
1029	req->rq_xmit_bytes_sent += sent;
1030	if (sent >= req->rq_slen)
1031	return 0;
1032	/* Still some bytes left; set up for a retry later. */
1033	status = -EAGAIN;
1034	}
1035
1036	process_status:
1037	switch (status) {
1038	case -ENOTSOCK:
1039	status = -ENOTCONN;
1040	/* Should we call xs_close() here? */
1041	break;
1042	case -EAGAIN:
1043	status = xs_sock_nospace(req);
1044	break;
1045	case -ENETUNREACH:
1046	case -ENOBUFS:
1047	case -EPIPE:
1048	case -ECONNREFUSED:
1049	case -EPERM:
1050	/* When the server has died, an ICMP port unreachable message
1051	* prompts ECONNREFUSED. */
1052	break;
1053	default:
1054	dprintk("RPC: sendmsg returned unrecognized error %d\n",
1055	-status);
1056	}
1057
1058	return status;
1059	}
1060
1061	/**
1062	* xs_tcp_send_request - write an RPC request to a TCP socket
1063	* @req: pointer to RPC request
1064	*
1065	* Return values:
1066	* 0: The request has been sent
1067	* EAGAIN: The socket was blocked, please call again later to
1068	* complete the request
1069	* ENOTCONN: Caller needs to invoke connect logic then call again
1070	* other: Some other error occurred, the request was not sent
1071	*
1072	* XXX: In the case of soft timeouts, should we eventually give up
1073	* if sendmsg is not able to make progress?
1074	*/
1075	static int xs_tcp_send_request(struct rpc_rqst *req)
1076	{
1077	struct rpc_xprt *xprt = req->rq_xprt;
1078	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1079	struct xdr_buf *xdr = &req->rq_snd_buf;
1080	rpc_fraghdr rm = xs_stream_record_marker(xdr);
1081	unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1082	struct msghdr msg = {
1083	.msg_flags = XS_SENDMSG_FLAGS,
1084	};
1085	bool vm_wait;
1086	unsigned int sent;
1087	int status;
1088
1089	/* Close the stream if the previous transmission was incomplete */
1090	if (xs_send_request_was_aborted(transport, req)) {
1091	if (transport->sock != NULL)
1092	kernel_sock_shutdown(sock: transport->sock, how: SHUT_RDWR);
1093	return -ENOTCONN;
1094	}
1095	if (!transport->inet)
1096	return -ENOTCONN;
1097
1098	xs_pktdump(msg: "packet data:",
1099	packet: req->rq_svec->iov_base,
1100	count: req->rq_svec->iov_len);
1101
1102	if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1103	xs_tcp_set_socket_timeouts(xprt, sock: transport->sock);
1104
1105	xs_set_srcport(transport, sock: transport->sock);
1106
1107	/* Continue transmitting the packet/record. We must be careful
1108	* to cope with writespace callbacks arriving _after_ we have
1109	* called sendmsg(). */
1110	req->rq_xtime = ktime_get();
1111	tcp_sock_set_cork(sk: transport->inet, on: true);
1112
1113	vm_wait = sk_stream_is_writeable(sk: transport->inet) ? true : false;
1114
1115	do {
1116	status = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr,
1117	base: transport->xmit.offset, marker: rm, sent_p: &sent);
1118
1119	dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1120	xdr->len - transport->xmit.offset, status);
1121
1122	/* If we've sent the entire packet, immediately
1123	* reset the count of bytes sent. */
1124	transport->xmit.offset += sent;
1125	req->rq_bytes_sent = transport->xmit.offset;
1126	if (likely(req->rq_bytes_sent >= msglen)) {
1127	req->rq_xmit_bytes_sent += transport->xmit.offset;
1128	transport->xmit.offset = 0;
1129	if (atomic_long_read(v: &xprt->xmit_queuelen) == 1)
1130	tcp_sock_set_cork(sk: transport->inet, on: false);
1131	return 0;
1132	}
1133
1134	WARN_ON_ONCE(sent == 0 && status == 0);
1135
1136	if (sent > 0)
1137	vm_wait = false;
1138
1139	} while (status == 0);
1140
1141	switch (status) {
1142	case -ENOTSOCK:
1143	status = -ENOTCONN;
1144	/* Should we call xs_close() here? */
1145	break;
1146	case -EAGAIN:
1147	status = xs_stream_nospace(req, vm_wait);
1148	break;
1149	case -ECONNRESET:
1150	case -ECONNREFUSED:
1151	case -ENOTCONN:
1152	case -EADDRINUSE:
1153	case -ENOBUFS:
1154	case -EPIPE:
1155	break;
1156	default:
1157	dprintk("RPC: sendmsg returned unrecognized error %d\n",
1158	-status);
1159	}
1160
1161	return status;
1162	}
1163
1164	static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1165	{
1166	transport->old_data_ready = sk->sk_data_ready;
1167	transport->old_state_change = sk->sk_state_change;
1168	transport->old_write_space = sk->sk_write_space;
1169	transport->old_error_report = sk->sk_error_report;
1170	}
1171
1172	static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1173	{
1174	sk->sk_data_ready = transport->old_data_ready;
1175	sk->sk_state_change = transport->old_state_change;
1176	sk->sk_write_space = transport->old_write_space;
1177	sk->sk_error_report = transport->old_error_report;
1178	}
1179
1180	static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1181	{
1182	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1183
1184	transport->xprt_err = 0;
1185	clear_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state);
1186	clear_bit(XPRT_SOCK_WAKE_ERROR, addr: &transport->sock_state);
1187	clear_bit(XPRT_SOCK_WAKE_WRITE, addr: &transport->sock_state);
1188	clear_bit(XPRT_SOCK_WAKE_DISCONNECT, addr: &transport->sock_state);
1189	clear_bit(XPRT_SOCK_NOSPACE, addr: &transport->sock_state);
1190	}
1191
1192	static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1193	{
1194	set_bit(nr, addr: &transport->sock_state);
1195	queue_work(wq: xprtiod_workqueue, work: &transport->error_worker);
1196	}
1197
1198	static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1199	{
1200	xprt->connect_cookie++;
1201	smp_mb__before_atomic();
1202	clear_bit(XPRT_CLOSE_WAIT, addr: &xprt->state);
1203	clear_bit(XPRT_CLOSING, addr: &xprt->state);
1204	xs_sock_reset_state_flags(xprt);
1205	smp_mb__after_atomic();
1206	}
1207
1208	/**
1209	* xs_error_report - callback to handle TCP socket state errors
1210	* @sk: socket
1211	*
1212	* Note: we don't call sock_error() since there may be a rpc_task
1213	* using the socket, and so we don't want to clear sk->sk_err.
1214	*/
1215	static void xs_error_report(struct sock *sk)
1216	{
1217	struct sock_xprt *transport;
1218	struct rpc_xprt *xprt;
1219
1220	if (!(xprt = xprt_from_sock(sk)))
1221	return;
1222
1223	transport = container_of(xprt, struct sock_xprt, xprt);
1224	transport->xprt_err = -sk->sk_err;
1225	if (transport->xprt_err == 0)
1226	return;
1227	dprintk("RPC: xs_error_report client %p, error=%d...\n",
1228	xprt, -transport->xprt_err);
1229	trace_rpc_socket_error(xprt, socket: sk->sk_socket, error: transport->xprt_err);
1230
1231	/* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1232	smp_mb__before_atomic();
1233	xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1234	}
1235
1236	static void xs_reset_transport(struct sock_xprt *transport)
1237	{
1238	struct socket *sock = transport->sock;
1239	struct sock *sk = transport->inet;
1240	struct rpc_xprt *xprt = &transport->xprt;
1241	struct file *filp = transport->file;
1242
1243	if (sk == NULL)
1244	return;
1245	/*
1246	* Make sure we're calling this in a context from which it is safe
1247	* to call __fput_sync(). In practice that means rpciod and the
1248	* system workqueue.
1249	*/
1250	if (!(current->flags & PF_WQ_WORKER)) {
1251	WARN_ON_ONCE(1);
1252	set_bit(XPRT_CLOSE_WAIT, addr: &xprt->state);
1253	return;
1254	}
1255
1256	if (atomic_read(v: &transport->xprt.swapper))
1257	sk_clear_memalloc(sk);
1258
1259	tls_handshake_cancel(sk);
1260
1261	kernel_sock_shutdown(sock, how: SHUT_RDWR);
1262
1263	mutex_lock(&transport->recv_mutex);
1264	lock_sock(sk);
1265	transport->inet = NULL;
1266	transport->sock = NULL;
1267	transport->file = NULL;
1268
1269	sk->sk_user_data = NULL;
1270
1271	xs_restore_old_callbacks(transport, sk);
1272	xprt_clear_connected(xprt);
1273	xs_sock_reset_connection_flags(xprt);
1274	/* Reset stream record info */
1275	xs_stream_reset_connect(transport);
1276	release_sock(sk);
1277	mutex_unlock(lock: &transport->recv_mutex);
1278
1279	trace_rpc_socket_close(xprt, socket: sock);
1280	__fput_sync(filp);
1281
1282	xprt_disconnect_done(xprt);
1283	}
1284
1285	/**
1286	* xs_close - close a socket
1287	* @xprt: transport
1288	*
1289	* This is used when all requests are complete; ie, no DRC state remains
1290	* on the server we want to save.
1291	*
1292	* The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1293	* xs_reset_transport() zeroing the socket from underneath a writer.
1294	*/
1295	static void xs_close(struct rpc_xprt *xprt)
1296	{
1297	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1298
1299	dprintk("RPC: xs_close xprt %p\n", xprt);
1300
1301	if (transport->sock)
1302	tls_handshake_close(sock: transport->sock);
1303	xs_reset_transport(transport);
1304	xprt->reestablish_timeout = 0;
1305	}
1306
1307	static void xs_inject_disconnect(struct rpc_xprt *xprt)
1308	{
1309	dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1310	xprt);
1311	xprt_disconnect_done(xprt);
1312	}
1313
1314	static void xs_xprt_free(struct rpc_xprt *xprt)
1315	{
1316	xs_free_peer_addresses(xprt);
1317	xprt_free(xprt);
1318	}
1319
1320	/**
1321	* xs_destroy - prepare to shutdown a transport
1322	* @xprt: doomed transport
1323	*
1324	*/
1325	static void xs_destroy(struct rpc_xprt *xprt)
1326	{
1327	struct sock_xprt *transport = container_of(xprt,
1328	struct sock_xprt, xprt);
1329	dprintk("RPC: xs_destroy xprt %p\n", xprt);
1330
1331	cancel_delayed_work_sync(dwork: &transport->connect_worker);
1332	xs_close(xprt);
1333	cancel_work_sync(work: &transport->recv_worker);
1334	cancel_work_sync(work: &transport->error_worker);
1335	xs_xprt_free(xprt);
1336	module_put(THIS_MODULE);
1337	}
1338
1339	/**
1340	* xs_udp_data_read_skb - receive callback for UDP sockets
1341	* @xprt: transport
1342	* @sk: socket
1343	* @skb: skbuff
1344	*
1345	*/
1346	static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1347	struct sock *sk,
1348	struct sk_buff *skb)
1349	{
1350	struct rpc_task *task;
1351	struct rpc_rqst *rovr;
1352	int repsize, copied;
1353	u32 _xid;
1354	__be32 *xp;
1355
1356	repsize = skb->len;
1357	if (repsize < 4) {
1358	dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1359	return;
1360	}
1361
1362	/* Copy the XID from the skb... */
1363	xp = skb_header_pointer(skb, offset: 0, len: sizeof(_xid), buffer: &_xid);
1364	if (xp == NULL)
1365	return;
1366
1367	/* Look up and lock the request corresponding to the given XID */
1368	spin_lock(lock: &xprt->queue_lock);
1369	rovr = xprt_lookup_rqst(xprt, xid: *xp);
1370	if (!rovr)
1371	goto out_unlock;
1372	xprt_pin_rqst(req: rovr);
1373	xprt_update_rtt(task: rovr->rq_task);
1374	spin_unlock(lock: &xprt->queue_lock);
1375	task = rovr->rq_task;
1376
1377	if ((copied = rovr->rq_private_buf.buflen) > repsize)
1378	copied = repsize;
1379
1380	/* Suck it into the iovec, verify checksum if not done by hw. */
1381	if (csum_partial_copy_to_xdr(xdr: &rovr->rq_private_buf, skb)) {
1382	spin_lock(lock: &xprt->queue_lock);
1383	__UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1384	goto out_unpin;
1385	}
1386
1387
1388	spin_lock(lock: &xprt->transport_lock);
1389	xprt_adjust_cwnd(xprt, task, result: copied);
1390	spin_unlock(lock: &xprt->transport_lock);
1391	spin_lock(lock: &xprt->queue_lock);
1392	xprt_complete_rqst(task, copied);
1393	__UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1394	out_unpin:
1395	xprt_unpin_rqst(req: rovr);
1396	out_unlock:
1397	spin_unlock(lock: &xprt->queue_lock);
1398	}
1399
1400	static void xs_udp_data_receive(struct sock_xprt *transport)
1401	{
1402	struct sk_buff *skb;
1403	struct sock *sk;
1404	int err;
1405
1406	mutex_lock(&transport->recv_mutex);
1407	sk = transport->inet;
1408	if (sk == NULL)
1409	goto out;
1410	for (;;) {
1411	skb = skb_recv_udp(sk, MSG_DONTWAIT, err: &err);
1412	if (skb == NULL)
1413	break;
1414	xs_udp_data_read_skb(xprt: &transport->xprt, sk, skb);
1415	consume_skb(skb);
1416	cond_resched();
1417	}
1418	xs_poll_check_readable(transport);
1419	out:
1420	mutex_unlock(lock: &transport->recv_mutex);
1421	}
1422
1423	static void xs_udp_data_receive_workfn(struct work_struct *work)
1424	{
1425	struct sock_xprt *transport =
1426	container_of(work, struct sock_xprt, recv_worker);
1427	unsigned int pflags = memalloc_nofs_save();
1428
1429	xs_udp_data_receive(transport);
1430	memalloc_nofs_restore(flags: pflags);
1431	}
1432
1433	/**
1434	* xs_data_ready - "data ready" callback for sockets
1435	* @sk: socket with data to read
1436	*
1437	*/
1438	static void xs_data_ready(struct sock *sk)
1439	{
1440	struct rpc_xprt *xprt;
1441
1442	trace_sk_data_ready(sk);
1443
1444	xprt = xprt_from_sock(sk);
1445	if (xprt != NULL) {
1446	struct sock_xprt *transport = container_of(xprt,
1447	struct sock_xprt, xprt);
1448
1449	trace_xs_data_ready(xprt);
1450
1451	transport->old_data_ready(sk);
1452
1453	if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
1454	return;
1455
1456	/* Any data means we had a useful conversation, so
1457	* then we don't need to delay the next reconnect
1458	*/
1459	if (xprt->reestablish_timeout)
1460	xprt->reestablish_timeout = 0;
1461	if (!test_and_set_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state))
1462	queue_work(wq: xprtiod_workqueue, work: &transport->recv_worker);
1463	}
1464	}
1465
1466	/*
1467	* Helper function to force a TCP close if the server is sending
1468	* junk and/or it has put us in CLOSE_WAIT
1469	*/
1470	static void xs_tcp_force_close(struct rpc_xprt *xprt)
1471	{
1472	xprt_force_disconnect(xprt);
1473	}
1474
1475	#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1476	static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1477	{
1478	return PAGE_SIZE;
1479	}
1480	#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1481
1482	/**
1483	* xs_local_state_change - callback to handle AF_LOCAL socket state changes
1484	* @sk: socket whose state has changed
1485	*
1486	*/
1487	static void xs_local_state_change(struct sock *sk)
1488	{
1489	struct rpc_xprt *xprt;
1490	struct sock_xprt *transport;
1491
1492	if (!(xprt = xprt_from_sock(sk)))
1493	return;
1494	transport = container_of(xprt, struct sock_xprt, xprt);
1495	if (sk->sk_shutdown & SHUTDOWN_MASK) {
1496	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1497	/* Trigger the socket release */
1498	xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1499	}
1500	}
1501
1502	/**
1503	* xs_tcp_state_change - callback to handle TCP socket state changes
1504	* @sk: socket whose state has changed
1505	*
1506	*/
1507	static void xs_tcp_state_change(struct sock *sk)
1508	{
1509	struct rpc_xprt *xprt;
1510	struct sock_xprt *transport;
1511
1512	if (!(xprt = xprt_from_sock(sk)))
1513	return;
1514	dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1515	dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1516	sk->sk_state, xprt_connected(xprt),
1517	sock_flag(sk, SOCK_DEAD),
1518	sock_flag(sk, SOCK_ZAPPED),
1519	sk->sk_shutdown);
1520
1521	transport = container_of(xprt, struct sock_xprt, xprt);
1522	trace_rpc_socket_state_change(xprt, socket: sk->sk_socket);
1523	switch (sk->sk_state) {
1524	case TCP_ESTABLISHED:
1525	if (!xprt_test_and_set_connected(xprt)) {
1526	xprt->connect_cookie++;
1527	clear_bit(XPRT_SOCK_CONNECTING, addr: &transport->sock_state);
1528	xprt_clear_connecting(xprt);
1529
1530	xprt->stat.connect_count++;
1531	xprt->stat.connect_time += (long)jiffies -
1532	xprt->stat.connect_start;
1533	xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1534	}
1535	break;
1536	case TCP_FIN_WAIT1:
1537	/* The client initiated a shutdown of the socket */
1538	xprt->connect_cookie++;
1539	xprt->reestablish_timeout = 0;
1540	set_bit(XPRT_CLOSING, addr: &xprt->state);
1541	smp_mb__before_atomic();
1542	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1543	clear_bit(XPRT_CLOSE_WAIT, addr: &xprt->state);
1544	smp_mb__after_atomic();
1545	break;
1546	case TCP_CLOSE_WAIT:
1547	/* The server initiated a shutdown of the socket */
1548	xprt->connect_cookie++;
1549	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1550	xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1551	fallthrough;
1552	case TCP_CLOSING:
1553	/*
1554	* If the server closed down the connection, make sure that
1555	* we back off before reconnecting
1556	*/
1557	if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1558	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1559	break;
1560	case TCP_LAST_ACK:
1561	set_bit(XPRT_CLOSING, addr: &xprt->state);
1562	smp_mb__before_atomic();
1563	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1564	smp_mb__after_atomic();
1565	break;
1566	case TCP_CLOSE:
1567	if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1568	addr: &transport->sock_state))
1569	xprt_clear_connecting(xprt);
1570	clear_bit(XPRT_CLOSING, addr: &xprt->state);
1571	/* Trigger the socket release */
1572	xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1573	}
1574	}
1575
1576	static void xs_write_space(struct sock *sk)
1577	{
1578	struct sock_xprt *transport;
1579	struct rpc_xprt *xprt;
1580
1581	if (!sk->sk_socket)
1582	return;
1583	clear_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags);
1584
1585	if (unlikely(!(xprt = xprt_from_sock(sk))))
1586	return;
1587	transport = container_of(xprt, struct sock_xprt, xprt);
1588	if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, addr: &transport->sock_state))
1589	return;
1590	xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1591	sk->sk_write_pending--;
1592	}
1593
1594	/**
1595	* xs_udp_write_space - callback invoked when socket buffer space
1596	* becomes available
1597	* @sk: socket whose state has changed
1598	*
1599	* Called when more output buffer space is available for this socket.
1600	* We try not to wake our writers until they can make "significant"
1601	* progress, otherwise we'll waste resources thrashing kernel_sendmsg
1602	* with a bunch of small requests.
1603	*/
1604	static void xs_udp_write_space(struct sock *sk)
1605	{
1606	/* from net/core/sock.c:sock_def_write_space */
1607	if (sock_writeable(sk))
1608	xs_write_space(sk);
1609	}
1610
1611	/**
1612	* xs_tcp_write_space - callback invoked when socket buffer space
1613	* becomes available
1614	* @sk: socket whose state has changed
1615	*
1616	* Called when more output buffer space is available for this socket.
1617	* We try not to wake our writers until they can make "significant"
1618	* progress, otherwise we'll waste resources thrashing kernel_sendmsg
1619	* with a bunch of small requests.
1620	*/
1621	static void xs_tcp_write_space(struct sock *sk)
1622	{
1623	/* from net/core/stream.c:sk_stream_write_space */
1624	if (sk_stream_is_writeable(sk))
1625	xs_write_space(sk);
1626	}
1627
1628	static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1629	{
1630	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1631	struct sock *sk = transport->inet;
1632
1633	if (transport->rcvsize) {
1634	sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1635	sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1636	}
1637	if (transport->sndsize) {
1638	sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1639	sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1640	sk->sk_write_space(sk);
1641	}
1642	}
1643
1644	/**
1645	* xs_udp_set_buffer_size - set send and receive limits
1646	* @xprt: generic transport
1647	* @sndsize: requested size of send buffer, in bytes
1648	* @rcvsize: requested size of receive buffer, in bytes
1649	*
1650	* Set socket send and receive buffer size limits.
1651	*/
1652	static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1653	{
1654	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1655
1656	transport->sndsize = 0;
1657	if (sndsize)
1658	transport->sndsize = sndsize + 1024;
1659	transport->rcvsize = 0;
1660	if (rcvsize)
1661	transport->rcvsize = rcvsize + 1024;
1662
1663	xs_udp_do_set_buffer_size(xprt);
1664	}
1665
1666	/**
1667	* xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1668	* @xprt: controlling transport
1669	* @task: task that timed out
1670	*
1671	* Adjust the congestion window after a retransmit timeout has occurred.
1672	*/
1673	static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1674	{
1675	spin_lock(lock: &xprt->transport_lock);
1676	xprt_adjust_cwnd(xprt, task, result: -ETIMEDOUT);
1677	spin_unlock(lock: &xprt->transport_lock);
1678	}
1679
1680	static int xs_get_random_port(void)
1681	{
1682	unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1683	unsigned short range;
1684	unsigned short rand;
1685
1686	if (max < min)
1687	return -EADDRINUSE;
1688	range = max - min + 1;
1689	rand = get_random_u32_below(ceil: range);
1690	return rand + min;
1691	}
1692
1693	static unsigned short xs_sock_getport(struct socket *sock)
1694	{
1695	struct sockaddr_storage buf;
1696	unsigned short port = 0;
1697
1698	if (kernel_getsockname(sock, addr: (struct sockaddr *)&buf) < 0)
1699	goto out;
1700	switch (buf.ss_family) {
1701	case AF_INET6:
1702	port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1703	break;
1704	case AF_INET:
1705	port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1706	}
1707	out:
1708	return port;
1709	}
1710
1711	/**
1712	* xs_set_port - reset the port number in the remote endpoint address
1713	* @xprt: generic transport
1714	* @port: new port number
1715	*
1716	*/
1717	static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1718	{
1719	dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1720
1721	rpc_set_port(sap: xs_addr(xprt), port);
1722	xs_update_peer_port(xprt);
1723	}
1724
1725	static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1726	{
1727	if (transport->srcport == 0 && transport->xprt.reuseport)
1728	transport->srcport = xs_sock_getport(sock);
1729	}
1730
1731	static int xs_get_srcport(struct sock_xprt *transport)
1732	{
1733	int port = transport->srcport;
1734
1735	if (port == 0 && transport->xprt.resvport)
1736	port = xs_get_random_port();
1737	return port;
1738	}
1739
1740	static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1741	{
1742	struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1743	unsigned short ret = 0;
1744	mutex_lock(&sock->recv_mutex);
1745	if (sock->sock)
1746	ret = xs_sock_getport(sock: sock->sock);
1747	mutex_unlock(lock: &sock->recv_mutex);
1748	return ret;
1749	}
1750
1751	static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1752	{
1753	struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1754	union {
1755	struct sockaddr sa;
1756	struct sockaddr_storage st;
1757	} saddr;
1758	int ret = -ENOTCONN;
1759
1760	mutex_lock(&sock->recv_mutex);
1761	if (sock->sock) {
1762	ret = kernel_getsockname(sock: sock->sock, addr: &saddr.sa);
1763	if (ret >= 0)
1764	ret = snprintf(buf, size: buflen, fmt: "%pISc", &saddr.sa);
1765	}
1766	mutex_unlock(lock: &sock->recv_mutex);
1767	return ret;
1768	}
1769
1770	static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1771	{
1772	if (transport->srcport != 0)
1773	transport->srcport = 0;
1774	if (!transport->xprt.resvport)
1775	return 0;
1776	if (port <= xprt_min_resvport || port > xprt_max_resvport)
1777	return xprt_max_resvport;
1778	return --port;
1779	}
1780	static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1781	{
1782	struct sockaddr_storage myaddr;
1783	int err, nloop = 0;
1784	int port = xs_get_srcport(transport);
1785	unsigned short last;
1786
1787	/*
1788	* If we are asking for any ephemeral port (i.e. port == 0 &&
1789	* transport->xprt.resvport == 0), don't bind. Let the local
1790	* port selection happen implicitly when the socket is used
1791	* (for example at connect time).
1792	*
1793	* This ensures that we can continue to establish TCP
1794	* connections even when all local ephemeral ports are already
1795	* a part of some TCP connection. This makes no difference
1796	* for UDP sockets, but also doesn't harm them.
1797	*
1798	* If we're asking for any reserved port (i.e. port == 0 &&
1799	* transport->xprt.resvport == 1) xs_get_srcport above will
1800	* ensure that port is non-zero and we will bind as needed.
1801	*/
1802	if (port <= 0)
1803	return port;
1804
1805	memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1806	do {
1807	rpc_set_port(sap: (struct sockaddr *)&myaddr, port);
1808	err = kernel_bind(sock, addr: (struct sockaddr *)&myaddr,
1809	addrlen: transport->xprt.addrlen);
1810	if (err == 0) {
1811	if (transport->xprt.reuseport)
1812	transport->srcport = port;
1813	break;
1814	}
1815	last = port;
1816	port = xs_next_srcport(transport, port);
1817	if (port > last)
1818	nloop++;
1819	} while (err == -EADDRINUSE && nloop != 2);
1820
1821	if (myaddr.ss_family == AF_INET)
1822	dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1823	&((struct sockaddr_in *)&myaddr)->sin_addr,
1824	port, err ? "failed" : "ok", err);
1825	else
1826	dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1827	&((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1828	port, err ? "failed" : "ok", err);
1829	return err;
1830	}
1831
1832	/*
1833	* We don't support autobind on AF_LOCAL sockets
1834	*/
1835	static void xs_local_rpcbind(struct rpc_task *task)
1836	{
1837	xprt_set_bound(xprt: task->tk_xprt);
1838	}
1839
1840	static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1841	{
1842	}
1843
1844	#ifdef CONFIG_DEBUG_LOCK_ALLOC
1845	static struct lock_class_key xs_key[3];
1846	static struct lock_class_key xs_slock_key[3];
1847
1848	static inline void xs_reclassify_socketu(struct socket *sock)
1849	{
1850	struct sock *sk = sock->sk;
1851
1852	sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1853	&xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1854	}
1855
1856	static inline void xs_reclassify_socket4(struct socket *sock)
1857	{
1858	struct sock *sk = sock->sk;
1859
1860	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1861	&xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1862	}
1863
1864	static inline void xs_reclassify_socket6(struct socket *sock)
1865	{
1866	struct sock *sk = sock->sk;
1867
1868	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1869	&xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1870	}
1871
1872	static inline void xs_reclassify_socket(int family, struct socket *sock)
1873	{
1874	if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1875	return;
1876
1877	switch (family) {
1878	case AF_LOCAL:
1879	xs_reclassify_socketu(sock);
1880	break;
1881	case AF_INET:
1882	xs_reclassify_socket4(sock);
1883	break;
1884	case AF_INET6:
1885	xs_reclassify_socket6(sock);
1886	break;
1887	}
1888	}
1889	#else
1890	static inline void xs_reclassify_socket(int family, struct socket *sock)
1891	{
1892	}
1893	#endif
1894
1895	static void xs_dummy_setup_socket(struct work_struct *work)
1896	{
1897	}
1898
1899	static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1900	struct sock_xprt *transport, int family, int type,
1901	int protocol, bool reuseport)
1902	{
1903	struct file *filp;
1904	struct socket *sock;
1905	int err;
1906
1907	err = __sock_create(net: xprt->xprt_net, family, type, proto: protocol, res: &sock, kern: 1);
1908	if (err < 0) {
1909	dprintk("RPC: can't create %d transport socket (%d).\n",
1910	protocol, -err);
1911	goto out;
1912	}
1913	xs_reclassify_socket(family, sock);
1914
1915	if (reuseport)
1916	sock_set_reuseport(sk: sock->sk);
1917
1918	err = xs_bind(transport, sock);
1919	if (err) {
1920	sock_release(sock);
1921	goto out;
1922	}
1923
1924	filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1925	if (IS_ERR(ptr: filp))
1926	return ERR_CAST(ptr: filp);
1927	transport->file = filp;
1928
1929	return sock;
1930	out:
1931	return ERR_PTR(error: err);
1932	}
1933
1934	static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1935	struct socket *sock)
1936	{
1937	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1938	xprt);
1939
1940	if (!transport->inet) {
1941	struct sock *sk = sock->sk;
1942
1943	lock_sock(sk);
1944
1945	xs_save_old_callbacks(transport, sk);
1946
1947	sk->sk_user_data = xprt;
1948	sk->sk_data_ready = xs_data_ready;
1949	sk->sk_write_space = xs_udp_write_space;
1950	sk->sk_state_change = xs_local_state_change;
1951	sk->sk_error_report = xs_error_report;
1952	sk->sk_use_task_frag = false;
1953
1954	xprt_clear_connected(xprt);
1955
1956	/* Reset to new socket */
1957	transport->sock = sock;
1958	transport->inet = sk;
1959
1960	release_sock(sk);
1961	}
1962
1963	xs_stream_start_connect(transport);
1964
1965	return kernel_connect(sock, addr: xs_addr(xprt), addrlen: xprt->addrlen, flags: 0);
1966	}
1967
1968	/**
1969	* xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1970	* @transport: socket transport to connect
1971	*/
1972	static int xs_local_setup_socket(struct sock_xprt *transport)
1973	{
1974	struct rpc_xprt *xprt = &transport->xprt;
1975	struct file *filp;
1976	struct socket *sock;
1977	int status;
1978
1979	status = __sock_create(net: xprt->xprt_net, AF_LOCAL,
1980	type: SOCK_STREAM, proto: 0, res: &sock, kern: 1);
1981	if (status < 0) {
1982	dprintk("RPC: can't create AF_LOCAL "
1983	"transport socket (%d).\n", -status);
1984	goto out;
1985	}
1986	xs_reclassify_socket(AF_LOCAL, sock);
1987
1988	filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1989	if (IS_ERR(ptr: filp)) {
1990	status = PTR_ERR(ptr: filp);
1991	goto out;
1992	}
1993	transport->file = filp;
1994
1995	dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1996	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1997
1998	status = xs_local_finish_connecting(xprt, sock);
1999	trace_rpc_socket_connect(xprt, socket: sock, error: status);
2000	switch (status) {
2001	case 0:
2002	dprintk("RPC: xprt %p connected to %s\n",
2003	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2004	xprt->stat.connect_count++;
2005	xprt->stat.connect_time += (long)jiffies -
2006	xprt->stat.connect_start;
2007	xprt_set_connected(xprt);
2008	break;
2009	case -ENOBUFS:
2010	break;
2011	case -ENOENT:
2012	dprintk("RPC: xprt %p: socket %s does not exist\n",
2013	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2014	break;
2015	case -ECONNREFUSED:
2016	dprintk("RPC: xprt %p: connection refused for %s\n",
2017	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2018	break;
2019	default:
2020	printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2021	__func__, -status,
2022	xprt->address_strings[RPC_DISPLAY_ADDR]);
2023	}
2024
2025	out:
2026	xprt_clear_connecting(xprt);
2027	xprt_wake_pending_tasks(xprt, status);
2028	return status;
2029	}
2030
2031	static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2032	{
2033	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2034	int ret;
2035
2036	if (transport->file)
2037	goto force_disconnect;
2038
2039	if (RPC_IS_ASYNC(task)) {
2040	/*
2041	* We want the AF_LOCAL connect to be resolved in the
2042	* filesystem namespace of the process making the rpc
2043	* call. Thus we connect synchronously.
2044	*
2045	* If we want to support asynchronous AF_LOCAL calls,
2046	* we'll need to figure out how to pass a namespace to
2047	* connect.
2048	*/
2049	rpc_task_set_rpc_status(task, rpc_status: -ENOTCONN);
2050	goto out_wake;
2051	}
2052	ret = xs_local_setup_socket(transport);
2053	if (ret && !RPC_IS_SOFTCONN(task))
2054	msleep_interruptible(msecs: 15000);
2055	return;
2056	force_disconnect:
2057	xprt_force_disconnect(xprt);
2058	out_wake:
2059	xprt_clear_connecting(xprt);
2060	xprt_wake_pending_tasks(xprt, status: -ENOTCONN);
2061	}
2062
2063	#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2064	/*
2065	* Note that this should be called with XPRT_LOCKED held, or recv_mutex
2066	* held, or when we otherwise know that we have exclusive access to the
2067	* socket, to guard against races with xs_reset_transport.
2068	*/
2069	static void xs_set_memalloc(struct rpc_xprt *xprt)
2070	{
2071	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2072	xprt);
2073
2074	/*
2075	* If there's no sock, then we have nothing to set. The
2076	* reconnecting process will get it for us.
2077	*/
2078	if (!transport->inet)
2079	return;
2080	if (atomic_read(v: &xprt->swapper))
2081	sk_set_memalloc(sk: transport->inet);
2082	}
2083
2084	/**
2085	* xs_enable_swap - Tag this transport as being used for swap.
2086	* @xprt: transport to tag
2087	*
2088	* Take a reference to this transport on behalf of the rpc_clnt, and
2089	* optionally mark it for swapping if it wasn't already.
2090	*/
2091	static int
2092	xs_enable_swap(struct rpc_xprt *xprt)
2093	{
2094	struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2095
2096	mutex_lock(&xs->recv_mutex);
2097	if (atomic_inc_return(v: &xprt->swapper) == 1 &&
2098	xs->inet)
2099	sk_set_memalloc(sk: xs->inet);
2100	mutex_unlock(lock: &xs->recv_mutex);
2101	return 0;
2102	}
2103
2104	/**
2105	* xs_disable_swap - Untag this transport as being used for swap.
2106	* @xprt: transport to tag
2107	*
2108	* Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2109	* swapper refcount goes to 0, untag the socket as a memalloc socket.
2110	*/
2111	static void
2112	xs_disable_swap(struct rpc_xprt *xprt)
2113	{
2114	struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2115
2116	mutex_lock(&xs->recv_mutex);
2117	if (atomic_dec_and_test(v: &xprt->swapper) &&
2118	xs->inet)
2119	sk_clear_memalloc(sk: xs->inet);
2120	mutex_unlock(lock: &xs->recv_mutex);
2121	}
2122	#else
2123	static void xs_set_memalloc(struct rpc_xprt *xprt)
2124	{
2125	}
2126
2127	static int
2128	xs_enable_swap(struct rpc_xprt *xprt)
2129	{
2130	return -EINVAL;
2131	}
2132
2133	static void
2134	xs_disable_swap(struct rpc_xprt *xprt)
2135	{
2136	}
2137	#endif
2138
2139	static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2140	{
2141	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2142
2143	if (!transport->inet) {
2144	struct sock *sk = sock->sk;
2145
2146	lock_sock(sk);
2147
2148	xs_save_old_callbacks(transport, sk);
2149
2150	sk->sk_user_data = xprt;
2151	sk->sk_data_ready = xs_data_ready;
2152	sk->sk_write_space = xs_udp_write_space;
2153	sk->sk_use_task_frag = false;
2154
2155	xprt_set_connected(xprt);
2156
2157	/* Reset to new socket */
2158	transport->sock = sock;
2159	transport->inet = sk;
2160
2161	xs_set_memalloc(xprt);
2162
2163	release_sock(sk);
2164	}
2165	xs_udp_do_set_buffer_size(xprt);
2166
2167	xprt->stat.connect_start = jiffies;
2168	}
2169
2170	static void xs_udp_setup_socket(struct work_struct *work)
2171	{
2172	struct sock_xprt *transport =
2173	container_of(work, struct sock_xprt, connect_worker.work);
2174	struct rpc_xprt *xprt = &transport->xprt;
2175	struct socket *sock;
2176	int status = -EIO;
2177	unsigned int pflags = current->flags;
2178
2179	if (atomic_read(v: &xprt->swapper))
2180	current->flags |= PF_MEMALLOC;
2181	sock = xs_create_sock(xprt, transport,
2182	family: xs_addr(xprt)->sa_family, type: SOCK_DGRAM,
2183	IPPROTO_UDP, reuseport: false);
2184	if (IS_ERR(ptr: sock))
2185	goto out;
2186
2187	dprintk("RPC: worker connecting xprt %p via %s to "
2188	"%s (port %s)\n", xprt,
2189	xprt->address_strings[RPC_DISPLAY_PROTO],
2190	xprt->address_strings[RPC_DISPLAY_ADDR],
2191	xprt->address_strings[RPC_DISPLAY_PORT]);
2192
2193	xs_udp_finish_connecting(xprt, sock);
2194	trace_rpc_socket_connect(xprt, socket: sock, error: 0);
2195	status = 0;
2196	out:
2197	xprt_clear_connecting(xprt);
2198	xprt_unlock_connect(xprt, transport);
2199	xprt_wake_pending_tasks(xprt, status);
2200	current_restore_flags(orig_flags: pflags, PF_MEMALLOC);
2201	}
2202
2203	/**
2204	* xs_tcp_shutdown - gracefully shut down a TCP socket
2205	* @xprt: transport
2206	*
2207	* Initiates a graceful shutdown of the TCP socket by calling the
2208	* equivalent of shutdown(SHUT_RDWR);
2209	*/
2210	static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2211	{
2212	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2213	struct socket *sock = transport->sock;
2214	int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2215
2216	if (sock == NULL)
2217	return;
2218	if (!xprt->reuseport) {
2219	xs_close(xprt);
2220	return;
2221	}
2222	switch (skst) {
2223	case TCP_FIN_WAIT1:
2224	case TCP_FIN_WAIT2:
2225	case TCP_LAST_ACK:
2226	break;
2227	case TCP_ESTABLISHED:
2228	case TCP_CLOSE_WAIT:
2229	kernel_sock_shutdown(sock, how: SHUT_RDWR);
2230	trace_rpc_socket_shutdown(xprt, socket: sock);
2231	break;
2232	default:
2233	xs_reset_transport(transport);
2234	}
2235	}
2236
2237	static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2238	struct socket *sock)
2239	{
2240	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2241	struct net *net = sock_net(sk: sock->sk);
2242	unsigned long connect_timeout;
2243	unsigned long syn_retries;
2244	unsigned int keepidle;
2245	unsigned int keepcnt;
2246	unsigned int timeo;
2247	unsigned long t;
2248
2249	spin_lock(lock: &xprt->transport_lock);
2250	keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2251	keepcnt = xprt->timeout->to_retries + 1;
2252	timeo = jiffies_to_msecs(j: xprt->timeout->to_initval) *
2253	(xprt->timeout->to_retries + 1);
2254	clear_bit(XPRT_SOCK_UPD_TIMEOUT, addr: &transport->sock_state);
2255	spin_unlock(lock: &xprt->transport_lock);
2256
2257	/* TCP Keepalive options */
2258	sock_set_keepalive(sk: sock->sk);
2259	tcp_sock_set_keepidle(sk: sock->sk, val: keepidle);
2260	tcp_sock_set_keepintvl(sk: sock->sk, val: keepidle);
2261	tcp_sock_set_keepcnt(sk: sock->sk, val: keepcnt);
2262
2263	/* TCP user timeout (see RFC5482) */
2264	tcp_sock_set_user_timeout(sk: sock->sk, val: timeo);
2265
2266	/* Connect timeout */
2267	connect_timeout = max_t(unsigned long,
2268	DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
2269	syn_retries = max_t(unsigned long,
2270	READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
2271	for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
2272	;
2273	if (t <= syn_retries)
2274	tcp_sock_set_syncnt(sk: sock->sk, val: t - 1);
2275	}
2276
2277	static void xs_tcp_do_set_connect_timeout(struct rpc_xprt *xprt,
2278	unsigned long connect_timeout)
2279	{
2280	struct sock_xprt *transport =
2281	container_of(xprt, struct sock_xprt, xprt);
2282	struct rpc_timeout to;
2283	unsigned long initval;
2284
2285	memcpy(&to, xprt->timeout, sizeof(to));
2286	/* Arbitrary lower limit */
2287	initval = max_t(unsigned long, connect_timeout, XS_TCP_INIT_REEST_TO);
2288	to.to_initval = initval;
2289	to.to_maxval = initval;
2290	to.to_retries = 0;
2291	memcpy(&transport->tcp_timeout, &to, sizeof(transport->tcp_timeout));
2292	xprt->timeout = &transport->tcp_timeout;
2293	xprt->connect_timeout = connect_timeout;
2294	}
2295
2296	static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2297	unsigned long connect_timeout,
2298	unsigned long reconnect_timeout)
2299	{
2300	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2301
2302	spin_lock(lock: &xprt->transport_lock);
2303	if (reconnect_timeout < xprt->max_reconnect_timeout)
2304	xprt->max_reconnect_timeout = reconnect_timeout;
2305	if (connect_timeout < xprt->connect_timeout)
2306	xs_tcp_do_set_connect_timeout(xprt, connect_timeout);
2307	set_bit(XPRT_SOCK_UPD_TIMEOUT, addr: &transport->sock_state);
2308	spin_unlock(lock: &xprt->transport_lock);
2309	}
2310
2311	static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2312	{
2313	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2314
2315	if (!transport->inet) {
2316	struct sock *sk = sock->sk;
2317
2318	/* Avoid temporary address, they are bad for long-lived
2319	* connections such as NFS mounts.
2320	* RFC4941, section 3.6 suggests that:
2321	* Individual applications, which have specific
2322	* knowledge about the normal duration of connections,
2323	* MAY override this as appropriate.
2324	*/
2325	if (xs_addr(xprt)->sa_family == PF_INET6) {
2326	ip6_sock_set_addr_preferences(sk,
2327	IPV6_PREFER_SRC_PUBLIC);
2328	}
2329
2330	xs_tcp_set_socket_timeouts(xprt, sock);
2331	tcp_sock_set_nodelay(sk);
2332
2333	lock_sock(sk);
2334
2335	xs_save_old_callbacks(transport, sk);
2336
2337	sk->sk_user_data = xprt;
2338	sk->sk_data_ready = xs_data_ready;
2339	sk->sk_state_change = xs_tcp_state_change;
2340	sk->sk_write_space = xs_tcp_write_space;
2341	sk->sk_error_report = xs_error_report;
2342	sk->sk_use_task_frag = false;
2343
2344	/* socket options */
2345	sock_reset_flag(sk, flag: SOCK_LINGER);
2346
2347	xprt_clear_connected(xprt);
2348
2349	/* Reset to new socket */
2350	transport->sock = sock;
2351	transport->inet = sk;
2352
2353	release_sock(sk);
2354	}
2355
2356	if (!xprt_bound(xprt))
2357	return -ENOTCONN;
2358
2359	xs_set_memalloc(xprt);
2360
2361	xs_stream_start_connect(transport);
2362
2363	/* Tell the socket layer to start connecting... */
2364	set_bit(XPRT_SOCK_CONNECTING, addr: &transport->sock_state);
2365	return kernel_connect(sock, addr: xs_addr(xprt), addrlen: xprt->addrlen, O_NONBLOCK);
2366	}
2367
2368	/**
2369	* xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2370	* @work: queued work item
2371	*
2372	* Invoked by a work queue tasklet.
2373	*/
2374	static void xs_tcp_setup_socket(struct work_struct *work)
2375	{
2376	struct sock_xprt *transport =
2377	container_of(work, struct sock_xprt, connect_worker.work);
2378	struct socket *sock = transport->sock;
2379	struct rpc_xprt *xprt = &transport->xprt;
2380	int status;
2381	unsigned int pflags = current->flags;
2382
2383	if (atomic_read(v: &xprt->swapper))
2384	current->flags |= PF_MEMALLOC;
2385
2386	if (xprt_connected(xprt))
2387	goto out;
2388	if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2389	addr: &transport->sock_state) ||
2390	!sock) {
2391	xs_reset_transport(transport);
2392	sock = xs_create_sock(xprt, transport, family: xs_addr(xprt)->sa_family,
2393	type: SOCK_STREAM, IPPROTO_TCP, reuseport: true);
2394	if (IS_ERR(ptr: sock)) {
2395	xprt_wake_pending_tasks(xprt, status: PTR_ERR(ptr: sock));
2396	goto out;
2397	}
2398	}
2399
2400	dprintk("RPC: worker connecting xprt %p via %s to "
2401	"%s (port %s)\n", xprt,
2402	xprt->address_strings[RPC_DISPLAY_PROTO],
2403	xprt->address_strings[RPC_DISPLAY_ADDR],
2404	xprt->address_strings[RPC_DISPLAY_PORT]);
2405
2406	status = xs_tcp_finish_connecting(xprt, sock);
2407	trace_rpc_socket_connect(xprt, socket: sock, error: status);
2408	dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2409	xprt, -status, xprt_connected(xprt),
2410	sock->sk->sk_state);
2411	switch (status) {
2412	case 0:
2413	case -EINPROGRESS:
2414	/* SYN_SENT! */
2415	set_bit(XPRT_SOCK_CONNECT_SENT, addr: &transport->sock_state);
2416	if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2417	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2418	fallthrough;
2419	case -EALREADY:
2420	goto out_unlock;
2421	case -EADDRNOTAVAIL:
2422	/* Source port number is unavailable. Try a new one! */
2423	transport->srcport = 0;
2424	status = -EAGAIN;
2425	break;
2426	case -EINVAL:
2427	/* Happens, for instance, if the user specified a link
2428	* local IPv6 address without a scope-id.
2429	*/
2430	case -ECONNREFUSED:
2431	case -ECONNRESET:
2432	case -ENETDOWN:
2433	case -ENETUNREACH:
2434	case -EHOSTUNREACH:
2435	case -EADDRINUSE:
2436	case -ENOBUFS:
2437	break;
2438	default:
2439	printk("%s: connect returned unhandled error %d\n",
2440	__func__, status);
2441	status = -EAGAIN;
2442	}
2443
2444	/* xs_tcp_force_close() wakes tasks with a fixed error code.
2445	* We need to wake them first to ensure the correct error code.
2446	*/
2447	xprt_wake_pending_tasks(xprt, status);
2448	xs_tcp_force_close(xprt);
2449	out:
2450	xprt_clear_connecting(xprt);
2451	out_unlock:
2452	xprt_unlock_connect(xprt, transport);
2453	current_restore_flags(orig_flags: pflags, PF_MEMALLOC);
2454	}
2455
2456	/*
2457	* Transfer the connected socket to @upper_transport, then mark that
2458	* xprt CONNECTED.
2459	*/
2460	static int xs_tcp_tls_finish_connecting(struct rpc_xprt *lower_xprt,
2461	struct sock_xprt *upper_transport)
2462	{
2463	struct sock_xprt *lower_transport =
2464	container_of(lower_xprt, struct sock_xprt, xprt);
2465	struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2466
2467	if (!upper_transport->inet) {
2468	struct socket *sock = lower_transport->sock;
2469	struct sock *sk = sock->sk;
2470
2471	/* Avoid temporary address, they are bad for long-lived
2472	* connections such as NFS mounts.
2473	* RFC4941, section 3.6 suggests that:
2474	* Individual applications, which have specific
2475	* knowledge about the normal duration of connections,
2476	* MAY override this as appropriate.
2477	*/
2478	if (xs_addr(xprt: upper_xprt)->sa_family == PF_INET6)
2479	ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2480
2481	xs_tcp_set_socket_timeouts(xprt: upper_xprt, sock);
2482	tcp_sock_set_nodelay(sk);
2483
2484	lock_sock(sk);
2485
2486	/* @sk is already connected, so it now has the RPC callbacks.
2487	* Reach into @lower_transport to save the original ones.
2488	*/
2489	upper_transport->old_data_ready = lower_transport->old_data_ready;
2490	upper_transport->old_state_change = lower_transport->old_state_change;
2491	upper_transport->old_write_space = lower_transport->old_write_space;
2492	upper_transport->old_error_report = lower_transport->old_error_report;
2493	sk->sk_user_data = upper_xprt;
2494
2495	/* socket options */
2496	sock_reset_flag(sk, flag: SOCK_LINGER);
2497
2498	xprt_clear_connected(xprt: upper_xprt);
2499
2500	upper_transport->sock = sock;
2501	upper_transport->inet = sk;
2502	upper_transport->file = lower_transport->file;
2503
2504	release_sock(sk);
2505
2506	/* Reset lower_transport before shutting down its clnt */
2507	mutex_lock(&lower_transport->recv_mutex);
2508	lower_transport->inet = NULL;
2509	lower_transport->sock = NULL;
2510	lower_transport->file = NULL;
2511
2512	xprt_clear_connected(xprt: lower_xprt);
2513	xs_sock_reset_connection_flags(xprt: lower_xprt);
2514	xs_stream_reset_connect(transport: lower_transport);
2515	mutex_unlock(lock: &lower_transport->recv_mutex);
2516	}
2517
2518	if (!xprt_bound(xprt: upper_xprt))
2519	return -ENOTCONN;
2520
2521	xs_set_memalloc(xprt: upper_xprt);
2522
2523	if (!xprt_test_and_set_connected(xprt: upper_xprt)) {
2524	upper_xprt->connect_cookie++;
2525	clear_bit(XPRT_SOCK_CONNECTING, addr: &upper_transport->sock_state);
2526	xprt_clear_connecting(xprt: upper_xprt);
2527
2528	upper_xprt->stat.connect_count++;
2529	upper_xprt->stat.connect_time += (long)jiffies -
2530	upper_xprt->stat.connect_start;
2531	xs_run_error_worker(transport: upper_transport, XPRT_SOCK_WAKE_PENDING);
2532	}
2533	return 0;
2534	}
2535
2536	/**
2537	* xs_tls_handshake_done - TLS handshake completion handler
2538	* @data: address of xprt to wake
2539	* @status: status of handshake
2540	* @peerid: serial number of key containing the remote's identity
2541	*
2542	*/
2543	static void xs_tls_handshake_done(void *data, int status, key_serial_t peerid)
2544	{
2545	struct rpc_xprt *lower_xprt = data;
2546	struct sock_xprt *lower_transport =
2547	container_of(lower_xprt, struct sock_xprt, xprt);
2548
2549	lower_transport->xprt_err = status ? -EACCES : 0;
2550	complete(&lower_transport->handshake_done);
2551	xprt_put(xprt: lower_xprt);
2552	}
2553
2554	static int xs_tls_handshake_sync(struct rpc_xprt *lower_xprt, struct xprtsec_parms *xprtsec)
2555	{
2556	struct sock_xprt *lower_transport =
2557	container_of(lower_xprt, struct sock_xprt, xprt);
2558	struct tls_handshake_args args = {
2559	.ta_sock = lower_transport->sock,
2560	.ta_done = xs_tls_handshake_done,
2561	.ta_data = xprt_get(xprt: lower_xprt),
2562	.ta_peername = lower_xprt->servername,
2563	};
2564	struct sock *sk = lower_transport->inet;
2565	int rc;
2566
2567	init_completion(x: &lower_transport->handshake_done);
2568	set_bit(XPRT_SOCK_IGNORE_RECV, addr: &lower_transport->sock_state);
2569	lower_transport->xprt_err = -ETIMEDOUT;
2570	switch (xprtsec->policy) {
2571	case RPC_XPRTSEC_TLS_ANON:
2572	rc = tls_client_hello_anon(args: &args, GFP_KERNEL);
2573	if (rc)
2574	goto out_put_xprt;
2575	break;
2576	case RPC_XPRTSEC_TLS_X509:
2577	args.ta_my_cert = xprtsec->cert_serial;
2578	args.ta_my_privkey = xprtsec->privkey_serial;
2579	rc = tls_client_hello_x509(args: &args, GFP_KERNEL);
2580	if (rc)
2581	goto out_put_xprt;
2582	break;
2583	default:
2584	rc = -EACCES;
2585	goto out_put_xprt;
2586	}
2587
2588	rc = wait_for_completion_interruptible_timeout(x: &lower_transport->handshake_done,
2589	XS_TLS_HANDSHAKE_TO);
2590	if (rc <= 0) {
2591	if (!tls_handshake_cancel(sk)) {
2592	if (rc == 0)
2593	rc = -ETIMEDOUT;
2594	goto out_put_xprt;
2595	}
2596	}
2597
2598	rc = lower_transport->xprt_err;
2599
2600	out:
2601	xs_stream_reset_connect(transport: lower_transport);
2602	clear_bit(XPRT_SOCK_IGNORE_RECV, addr: &lower_transport->sock_state);
2603	return rc;
2604
2605	out_put_xprt:
2606	xprt_put(xprt: lower_xprt);
2607	goto out;
2608	}
2609
2610	/**
2611	* xs_tcp_tls_setup_socket - establish a TLS session on a TCP socket
2612	* @work: queued work item
2613	*
2614	* Invoked by a work queue tasklet.
2615	*
2616	* For RPC-with-TLS, there is a two-stage connection process.
2617	*
2618	* The "upper-layer xprt" is visible to the RPC consumer. Once it has
2619	* been marked connected, the consumer knows that a TCP connection and
2620	* a TLS session have been established.
2621	*
2622	* A "lower-layer xprt", created in this function, handles the mechanics
2623	* of connecting the TCP socket, performing the RPC_AUTH_TLS probe, and
2624	* then driving the TLS handshake. Once all that is complete, the upper
2625	* layer xprt is marked connected.
2626	*/
2627	static void xs_tcp_tls_setup_socket(struct work_struct *work)
2628	{
2629	struct sock_xprt *upper_transport =
2630	container_of(work, struct sock_xprt, connect_worker.work);
2631	struct rpc_clnt *upper_clnt = upper_transport->clnt;
2632	struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2633	struct rpc_create_args args = {
2634	.net = upper_xprt->xprt_net,
2635	.protocol = upper_xprt->prot,
2636	.address = (struct sockaddr *)&upper_xprt->addr,
2637	.addrsize = upper_xprt->addrlen,
2638	.timeout = upper_clnt->cl_timeout,
2639	.servername = upper_xprt->servername,
2640	.program = upper_clnt->cl_program,
2641	.prognumber = upper_clnt->cl_prog,
2642	.version = upper_clnt->cl_vers,
2643	.authflavor = RPC_AUTH_TLS,
2644	.cred = upper_clnt->cl_cred,
2645	.xprtsec = {
2646	.policy = RPC_XPRTSEC_NONE,
2647	},
2648	};
2649	unsigned int pflags = current->flags;
2650	struct rpc_clnt *lower_clnt;
2651	struct rpc_xprt *lower_xprt;
2652	int status;
2653
2654	if (atomic_read(v: &upper_xprt->swapper))
2655	current->flags |= PF_MEMALLOC;
2656
2657	xs_stream_start_connect(transport: upper_transport);
2658
2659	/* This implicitly sends an RPC_AUTH_TLS probe */
2660	lower_clnt = rpc_create(args: &args);
2661	if (IS_ERR(ptr: lower_clnt)) {
2662	trace_rpc_tls_unavailable(clnt: upper_clnt, xprt: upper_xprt);
2663	clear_bit(XPRT_SOCK_CONNECTING, addr: &upper_transport->sock_state);
2664	xprt_clear_connecting(xprt: upper_xprt);
2665	xprt_wake_pending_tasks(xprt: upper_xprt, status: PTR_ERR(ptr: lower_clnt));
2666	xs_run_error_worker(transport: upper_transport, XPRT_SOCK_WAKE_PENDING);
2667	goto out_unlock;
2668	}
2669
2670	/* RPC_AUTH_TLS probe was successful. Try a TLS handshake on
2671	* the lower xprt.
2672	*/
2673	rcu_read_lock();
2674	lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
2675	rcu_read_unlock();
2676
2677	if (wait_on_bit_lock(word: &lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2678	goto out_unlock;
2679
2680	status = xs_tls_handshake_sync(lower_xprt, xprtsec: &upper_xprt->xprtsec);
2681	if (status) {
2682	trace_rpc_tls_not_started(clnt: upper_clnt, xprt: upper_xprt);
2683	goto out_close;
2684	}
2685
2686	status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
2687	if (status)
2688	goto out_close;
2689	xprt_release_write(lower_xprt, NULL);
2690
2691	trace_rpc_socket_connect(xprt: upper_xprt, socket: upper_transport->sock, error: 0);
2692	if (!xprt_test_and_set_connected(xprt: upper_xprt)) {
2693	upper_xprt->connect_cookie++;
2694	clear_bit(XPRT_SOCK_CONNECTING, addr: &upper_transport->sock_state);
2695	xprt_clear_connecting(xprt: upper_xprt);
2696
2697	upper_xprt->stat.connect_count++;
2698	upper_xprt->stat.connect_time += (long)jiffies -
2699	upper_xprt->stat.connect_start;
2700	xs_run_error_worker(transport: upper_transport, XPRT_SOCK_WAKE_PENDING);
2701	}
2702	rpc_shutdown_client(lower_clnt);
2703
2704	out_unlock:
2705	current_restore_flags(orig_flags: pflags, PF_MEMALLOC);
2706	upper_transport->clnt = NULL;
2707	xprt_unlock_connect(upper_xprt, upper_transport);
2708	return;
2709
2710	out_close:
2711	xprt_release_write(lower_xprt, NULL);
2712	rpc_shutdown_client(lower_clnt);
2713
2714	/* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2715	* Wake them first here to ensure they get our tk_status code.
2716	*/
2717	xprt_wake_pending_tasks(xprt: upper_xprt, status);
2718	xs_tcp_force_close(xprt: upper_xprt);
2719	xprt_clear_connecting(xprt: upper_xprt);
2720	goto out_unlock;
2721	}
2722
2723	/**
2724	* xs_connect - connect a socket to a remote endpoint
2725	* @xprt: pointer to transport structure
2726	* @task: address of RPC task that manages state of connect request
2727	*
2728	* TCP: If the remote end dropped the connection, delay reconnecting.
2729	*
2730	* UDP socket connects are synchronous, but we use a work queue anyway
2731	* to guarantee that even unprivileged user processes can set up a
2732	* socket on a privileged port.
2733	*
2734	* If a UDP socket connect fails, the delay behavior here prevents
2735	* retry floods (hard mounts).
2736	*/
2737	static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2738	{
2739	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2740	unsigned long delay = 0;
2741
2742	WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2743
2744	if (transport->sock != NULL) {
2745	dprintk("RPC: xs_connect delayed xprt %p for %lu "
2746	"seconds\n", xprt, xprt->reestablish_timeout / HZ);
2747
2748	delay = xprt_reconnect_delay(xprt);
2749	xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2750
2751	} else
2752	dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2753
2754	transport->clnt = task->tk_client;
2755	queue_delayed_work(wq: xprtiod_workqueue,
2756	dwork: &transport->connect_worker,
2757	delay);
2758	}
2759
2760	static void xs_wake_disconnect(struct sock_xprt *transport)
2761	{
2762	if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, addr: &transport->sock_state))
2763	xs_tcp_force_close(xprt: &transport->xprt);
2764	}
2765
2766	static void xs_wake_write(struct sock_xprt *transport)
2767	{
2768	if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, addr: &transport->sock_state))
2769	xprt_write_space(xprt: &transport->xprt);
2770	}
2771
2772	static void xs_wake_error(struct sock_xprt *transport)
2773	{
2774	int sockerr;
2775
2776	if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, addr: &transport->sock_state))
2777	return;
2778	sockerr = xchg(&transport->xprt_err, 0);
2779	if (sockerr < 0) {
2780	xprt_wake_pending_tasks(xprt: &transport->xprt, status: sockerr);
2781	xs_tcp_force_close(xprt: &transport->xprt);
2782	}
2783	}
2784
2785	static void xs_wake_pending(struct sock_xprt *transport)
2786	{
2787	if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, addr: &transport->sock_state))
2788	xprt_wake_pending_tasks(xprt: &transport->xprt, status: -EAGAIN);
2789	}
2790
2791	static void xs_error_handle(struct work_struct *work)
2792	{
2793	struct sock_xprt *transport = container_of(work,
2794	struct sock_xprt, error_worker);
2795
2796	xs_wake_disconnect(transport);
2797	xs_wake_write(transport);
2798	xs_wake_error(transport);
2799	xs_wake_pending(transport);
2800	}
2801
2802	/**
2803	* xs_local_print_stats - display AF_LOCAL socket-specific stats
2804	* @xprt: rpc_xprt struct containing statistics
2805	* @seq: output file
2806	*
2807	*/
2808	static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2809	{
2810	long idle_time = 0;
2811
2812	if (xprt_connected(xprt))
2813	idle_time = (long)(jiffies - xprt->last_used) / HZ;
2814
2815	seq_printf(m: seq, fmt: "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2816	"%llu %llu %lu %llu %llu\n",
2817	xprt->stat.bind_count,
2818	xprt->stat.connect_count,
2819	xprt->stat.connect_time / HZ,
2820	idle_time,
2821	xprt->stat.sends,
2822	xprt->stat.recvs,
2823	xprt->stat.bad_xids,
2824	xprt->stat.req_u,
2825	xprt->stat.bklog_u,
2826	xprt->stat.max_slots,
2827	xprt->stat.sending_u,
2828	xprt->stat.pending_u);
2829	}
2830
2831	/**
2832	* xs_udp_print_stats - display UDP socket-specific stats
2833	* @xprt: rpc_xprt struct containing statistics
2834	* @seq: output file
2835	*
2836	*/
2837	static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2838	{
2839	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2840
2841	seq_printf(m: seq, fmt: "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2842	"%lu %llu %llu\n",
2843	transport->srcport,
2844	xprt->stat.bind_count,
2845	xprt->stat.sends,
2846	xprt->stat.recvs,
2847	xprt->stat.bad_xids,
2848	xprt->stat.req_u,
2849	xprt->stat.bklog_u,
2850	xprt->stat.max_slots,
2851	xprt->stat.sending_u,
2852	xprt->stat.pending_u);
2853	}
2854
2855	/**
2856	* xs_tcp_print_stats - display TCP socket-specific stats
2857	* @xprt: rpc_xprt struct containing statistics
2858	* @seq: output file
2859	*
2860	*/
2861	static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2862	{
2863	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2864	long idle_time = 0;
2865
2866	if (xprt_connected(xprt))
2867	idle_time = (long)(jiffies - xprt->last_used) / HZ;
2868
2869	seq_printf(m: seq, fmt: "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2870	"%llu %llu %lu %llu %llu\n",
2871	transport->srcport,
2872	xprt->stat.bind_count,
2873	xprt->stat.connect_count,
2874	xprt->stat.connect_time / HZ,
2875	idle_time,
2876	xprt->stat.sends,
2877	xprt->stat.recvs,
2878	xprt->stat.bad_xids,
2879	xprt->stat.req_u,
2880	xprt->stat.bklog_u,
2881	xprt->stat.max_slots,
2882	xprt->stat.sending_u,
2883	xprt->stat.pending_u);
2884	}
2885
2886	/*
2887	* Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2888	* we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2889	* to use the server side send routines.
2890	*/
2891	static int bc_malloc(struct rpc_task *task)
2892	{
2893	struct rpc_rqst *rqst = task->tk_rqstp;
2894	size_t size = rqst->rq_callsize;
2895	struct page *page;
2896	struct rpc_buffer *buf;
2897
2898	if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2899	WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2900	size);
2901	return -EINVAL;
2902	}
2903
2904	page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2905	if (!page)
2906	return -ENOMEM;
2907
2908	buf = page_address(page);
2909	buf->len = PAGE_SIZE;
2910
2911	rqst->rq_buffer = buf->data;
2912	rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2913	return 0;
2914	}
2915
2916	/*
2917	* Free the space allocated in the bc_alloc routine
2918	*/
2919	static void bc_free(struct rpc_task *task)
2920	{
2921	void *buffer = task->tk_rqstp->rq_buffer;
2922	struct rpc_buffer *buf;
2923
2924	buf = container_of(buffer, struct rpc_buffer, data);
2925	free_page((unsigned long)buf);
2926	}
2927
2928	static int bc_sendto(struct rpc_rqst *req)
2929	{
2930	struct xdr_buf *xdr = &req->rq_snd_buf;
2931	struct sock_xprt *transport =
2932	container_of(req->rq_xprt, struct sock_xprt, xprt);
2933	struct msghdr msg = {
2934	.msg_flags = 0,
2935	};
2936	rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2937	(u32)xdr->len);
2938	unsigned int sent = 0;
2939	int err;
2940
2941	req->rq_xtime = ktime_get();
2942	err = xdr_alloc_bvec(buf: xdr, gfp: rpc_task_gfp_mask());
2943	if (err < 0)
2944	return err;
2945	err = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr, base: 0, marker, sent_p: &sent);
2946	xdr_free_bvec(buf: xdr);
2947	if (err < 0 || sent != (xdr->len + sizeof(marker)))
2948	return -EAGAIN;
2949	return sent;
2950	}
2951
2952	/**
2953	* bc_send_request - Send a backchannel Call on a TCP socket
2954	* @req: rpc_rqst containing Call message to be sent
2955	*
2956	* xpt_mutex ensures @rqstp's whole message is written to the socket
2957	* without interruption.
2958	*
2959	* Return values:
2960	* %0 if the message was sent successfully
2961	* %ENOTCONN if the message was not sent
2962	*/
2963	static int bc_send_request(struct rpc_rqst *req)
2964	{
2965	struct svc_xprt *xprt;
2966	int len;
2967
2968	/*
2969	* Get the server socket associated with this callback xprt
2970	*/
2971	xprt = req->rq_xprt->bc_xprt;
2972
2973	/*
2974	* Grab the mutex to serialize data as the connection is shared
2975	* with the fore channel
2976	*/
2977	mutex_lock(&xprt->xpt_mutex);
2978	if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2979	len = -ENOTCONN;
2980	else
2981	len = bc_sendto(req);
2982	mutex_unlock(lock: &xprt->xpt_mutex);
2983
2984	if (len > 0)
2985	len = 0;
2986
2987	return len;
2988	}
2989
2990	/*
2991	* The close routine. Since this is client initiated, we do nothing
2992	*/
2993
2994	static void bc_close(struct rpc_xprt *xprt)
2995	{
2996	xprt_disconnect_done(xprt);
2997	}
2998
2999	/*
3000	* The xprt destroy routine. Again, because this connection is client
3001	* initiated, we do nothing
3002	*/
3003
3004	static void bc_destroy(struct rpc_xprt *xprt)
3005	{
3006	dprintk("RPC: bc_destroy xprt %p\n", xprt);
3007
3008	xs_xprt_free(xprt);
3009	module_put(THIS_MODULE);
3010	}
3011
3012	static const struct rpc_xprt_ops xs_local_ops = {
3013	.reserve_xprt = xprt_reserve_xprt,
3014	.release_xprt = xprt_release_xprt,
3015	.alloc_slot = xprt_alloc_slot,
3016	.free_slot = xprt_free_slot,
3017	.rpcbind = xs_local_rpcbind,
3018	.set_port = xs_local_set_port,
3019	.connect = xs_local_connect,
3020	.buf_alloc = rpc_malloc,
3021	.buf_free = rpc_free,
3022	.prepare_request = xs_stream_prepare_request,
3023	.send_request = xs_local_send_request,
3024	.wait_for_reply_request = xprt_wait_for_reply_request_def,
3025	.close = xs_close,
3026	.destroy = xs_destroy,
3027	.print_stats = xs_local_print_stats,
3028	.enable_swap = xs_enable_swap,
3029	.disable_swap = xs_disable_swap,
3030	};
3031
3032	static const struct rpc_xprt_ops xs_udp_ops = {
3033	.set_buffer_size = xs_udp_set_buffer_size,
3034	.reserve_xprt = xprt_reserve_xprt_cong,
3035	.release_xprt = xprt_release_xprt_cong,
3036	.alloc_slot = xprt_alloc_slot,
3037	.free_slot = xprt_free_slot,
3038	.rpcbind = rpcb_getport_async,
3039	.set_port = xs_set_port,
3040	.connect = xs_connect,
3041	.get_srcaddr = xs_sock_srcaddr,
3042	.get_srcport = xs_sock_srcport,
3043	.buf_alloc = rpc_malloc,
3044	.buf_free = rpc_free,
3045	.send_request = xs_udp_send_request,
3046	.wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3047	.timer = xs_udp_timer,
3048	.release_request = xprt_release_rqst_cong,
3049	.close = xs_close,
3050	.destroy = xs_destroy,
3051	.print_stats = xs_udp_print_stats,
3052	.enable_swap = xs_enable_swap,
3053	.disable_swap = xs_disable_swap,
3054	.inject_disconnect = xs_inject_disconnect,
3055	};
3056
3057	static const struct rpc_xprt_ops xs_tcp_ops = {
3058	.reserve_xprt = xprt_reserve_xprt,
3059	.release_xprt = xprt_release_xprt,
3060	.alloc_slot = xprt_alloc_slot,
3061	.free_slot = xprt_free_slot,
3062	.rpcbind = rpcb_getport_async,
3063	.set_port = xs_set_port,
3064	.connect = xs_connect,
3065	.get_srcaddr = xs_sock_srcaddr,
3066	.get_srcport = xs_sock_srcport,
3067	.buf_alloc = rpc_malloc,
3068	.buf_free = rpc_free,
3069	.prepare_request = xs_stream_prepare_request,
3070	.send_request = xs_tcp_send_request,
3071	.wait_for_reply_request = xprt_wait_for_reply_request_def,
3072	.close = xs_tcp_shutdown,
3073	.destroy = xs_destroy,
3074	.set_connect_timeout = xs_tcp_set_connect_timeout,
3075	.print_stats = xs_tcp_print_stats,
3076	.enable_swap = xs_enable_swap,
3077	.disable_swap = xs_disable_swap,
3078	.inject_disconnect = xs_inject_disconnect,
3079	#ifdef CONFIG_SUNRPC_BACKCHANNEL
3080	.bc_setup = xprt_setup_bc,
3081	.bc_maxpayload = xs_tcp_bc_maxpayload,
3082	.bc_num_slots = xprt_bc_max_slots,
3083	.bc_free_rqst = xprt_free_bc_rqst,
3084	.bc_destroy = xprt_destroy_bc,
3085	#endif
3086	};
3087
3088	/*
3089	* The rpc_xprt_ops for the server backchannel
3090	*/
3091
3092	static const struct rpc_xprt_ops bc_tcp_ops = {
3093	.reserve_xprt = xprt_reserve_xprt,
3094	.release_xprt = xprt_release_xprt,
3095	.alloc_slot = xprt_alloc_slot,
3096	.free_slot = xprt_free_slot,
3097	.buf_alloc = bc_malloc,
3098	.buf_free = bc_free,
3099	.send_request = bc_send_request,
3100	.wait_for_reply_request = xprt_wait_for_reply_request_def,
3101	.close = bc_close,
3102	.destroy = bc_destroy,
3103	.print_stats = xs_tcp_print_stats,
3104	.enable_swap = xs_enable_swap,
3105	.disable_swap = xs_disable_swap,
3106	.inject_disconnect = xs_inject_disconnect,
3107	};
3108
3109	static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3110	{
3111	static const struct sockaddr_in sin = {
3112	.sin_family = AF_INET,
3113	.sin_addr.s_addr = htonl(INADDR_ANY),
3114	};
3115	static const struct sockaddr_in6 sin6 = {
3116	.sin6_family = AF_INET6,
3117	.sin6_addr = IN6ADDR_ANY_INIT,
3118	};
3119
3120	switch (family) {
3121	case AF_LOCAL:
3122	break;
3123	case AF_INET:
3124	memcpy(sap, &sin, sizeof(sin));
3125	break;
3126	case AF_INET6:
3127	memcpy(sap, &sin6, sizeof(sin6));
3128	break;
3129	default:
3130	dprintk("RPC: %s: Bad address family\n", __func__);
3131	return -EAFNOSUPPORT;
3132	}
3133	return 0;
3134	}
3135
3136	static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3137	unsigned int slot_table_size,
3138	unsigned int max_slot_table_size)
3139	{
3140	struct rpc_xprt *xprt;
3141	struct sock_xprt *new;
3142
3143	if (args->addrlen > sizeof(xprt->addr)) {
3144	dprintk("RPC: xs_setup_xprt: address too large\n");
3145	return ERR_PTR(error: -EBADF);
3146	}
3147
3148	xprt = xprt_alloc(net: args->net, size: sizeof(*new), num_prealloc: slot_table_size,
3149	max_req: max_slot_table_size);
3150	if (xprt == NULL) {
3151	dprintk("RPC: xs_setup_xprt: couldn't allocate "
3152	"rpc_xprt\n");
3153	return ERR_PTR(error: -ENOMEM);
3154	}
3155
3156	new = container_of(xprt, struct sock_xprt, xprt);
3157	mutex_init(&new->recv_mutex);
3158	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3159	xprt->addrlen = args->addrlen;
3160	if (args->srcaddr)
3161	memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3162	else {
3163	int err;
3164	err = xs_init_anyaddr(family: args->dstaddr->sa_family,
3165	sap: (struct sockaddr *)&new->srcaddr);
3166	if (err != 0) {
3167	xprt_free(xprt);
3168	return ERR_PTR(error: err);
3169	}
3170	}
3171
3172	return xprt;
3173	}
3174
3175	static const struct rpc_timeout xs_local_default_timeout = {
3176	.to_initval = 10 * HZ,
3177	.to_maxval = 10 * HZ,
3178	.to_retries = 2,
3179	};
3180
3181	/**
3182	* xs_setup_local - Set up transport to use an AF_LOCAL socket
3183	* @args: rpc transport creation arguments
3184	*
3185	* AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3186	*/
3187	static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3188	{
3189	struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3190	struct sock_xprt *transport;
3191	struct rpc_xprt *xprt;
3192	struct rpc_xprt *ret;
3193
3194	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3195	max_slot_table_size: xprt_max_tcp_slot_table_entries);
3196	if (IS_ERR(ptr: xprt))
3197	return xprt;
3198	transport = container_of(xprt, struct sock_xprt, xprt);
3199
3200	xprt->prot = 0;
3201	xprt->xprt_class = &xs_local_transport;
3202	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3203
3204	xprt->bind_timeout = XS_BIND_TO;
3205	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3206	xprt->idle_timeout = XS_IDLE_DISC_TO;
3207
3208	xprt->ops = &xs_local_ops;
3209	xprt->timeout = &xs_local_default_timeout;
3210
3211	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3212	INIT_WORK(&transport->error_worker, xs_error_handle);
3213	INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3214
3215	switch (sun->sun_family) {
3216	case AF_LOCAL:
3217	if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3218	dprintk("RPC: bad AF_LOCAL address: %s\n",
3219	sun->sun_path);
3220	ret = ERR_PTR(error: -EINVAL);
3221	goto out_err;
3222	}
3223	xprt_set_bound(xprt);
3224	xs_format_peer_addresses(xprt, protocol: "local", RPCBIND_NETID_LOCAL);
3225	break;
3226	default:
3227	ret = ERR_PTR(error: -EAFNOSUPPORT);
3228	goto out_err;
3229	}
3230
3231	dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
3232	xprt->address_strings[RPC_DISPLAY_ADDR]);
3233
3234	if (try_module_get(THIS_MODULE))
3235	return xprt;
3236	ret = ERR_PTR(error: -EINVAL);
3237	out_err:
3238	xs_xprt_free(xprt);
3239	return ret;
3240	}
3241
3242	static const struct rpc_timeout xs_udp_default_timeout = {
3243	.to_initval = 5 * HZ,
3244	.to_maxval = 30 * HZ,
3245	.to_increment = 5 * HZ,
3246	.to_retries = 5,
3247	};
3248
3249	/**
3250	* xs_setup_udp - Set up transport to use a UDP socket
3251	* @args: rpc transport creation arguments
3252	*
3253	*/
3254	static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3255	{
3256	struct sockaddr *addr = args->dstaddr;
3257	struct rpc_xprt *xprt;
3258	struct sock_xprt *transport;
3259	struct rpc_xprt *ret;
3260
3261	xprt = xs_setup_xprt(args, slot_table_size: xprt_udp_slot_table_entries,
3262	max_slot_table_size: xprt_udp_slot_table_entries);
3263	if (IS_ERR(ptr: xprt))
3264	return xprt;
3265	transport = container_of(xprt, struct sock_xprt, xprt);
3266
3267	xprt->prot = IPPROTO_UDP;
3268	xprt->xprt_class = &xs_udp_transport;
3269	/* XXX: header size can vary due to auth type, IPv6, etc. */
3270	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3271
3272	xprt->bind_timeout = XS_BIND_TO;
3273	xprt->reestablish_timeout = XS_UDP_REEST_TO;
3274	xprt->idle_timeout = XS_IDLE_DISC_TO;
3275
3276	xprt->ops = &xs_udp_ops;
3277
3278	xprt->timeout = &xs_udp_default_timeout;
3279
3280	INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3281	INIT_WORK(&transport->error_worker, xs_error_handle);
3282	INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3283
3284	switch (addr->sa_family) {
3285	case AF_INET:
3286	if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3287	xprt_set_bound(xprt);
3288
3289	xs_format_peer_addresses(xprt, protocol: "udp", RPCBIND_NETID_UDP);
3290	break;
3291	case AF_INET6:
3292	if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3293	xprt_set_bound(xprt);
3294
3295	xs_format_peer_addresses(xprt, protocol: "udp", RPCBIND_NETID_UDP6);
3296	break;
3297	default:
3298	ret = ERR_PTR(error: -EAFNOSUPPORT);
3299	goto out_err;
3300	}
3301
3302	if (xprt_bound(xprt))
3303	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3304	xprt->address_strings[RPC_DISPLAY_ADDR],
3305	xprt->address_strings[RPC_DISPLAY_PORT],
3306	xprt->address_strings[RPC_DISPLAY_PROTO]);
3307	else
3308	dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3309	xprt->address_strings[RPC_DISPLAY_ADDR],
3310	xprt->address_strings[RPC_DISPLAY_PROTO]);
3311
3312	if (try_module_get(THIS_MODULE))
3313	return xprt;
3314	ret = ERR_PTR(error: -EINVAL);
3315	out_err:
3316	xs_xprt_free(xprt);
3317	return ret;
3318	}
3319
3320	static const struct rpc_timeout xs_tcp_default_timeout = {
3321	.to_initval = 60 * HZ,
3322	.to_maxval = 60 * HZ,
3323	.to_retries = 2,
3324	};
3325
3326	/**
3327	* xs_setup_tcp - Set up transport to use a TCP socket
3328	* @args: rpc transport creation arguments
3329	*
3330	*/
3331	static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3332	{
3333	struct sockaddr *addr = args->dstaddr;
3334	struct rpc_xprt *xprt;
3335	struct sock_xprt *transport;
3336	struct rpc_xprt *ret;
3337	unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3338
3339	if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3340	max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3341
3342	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3343	max_slot_table_size);
3344	if (IS_ERR(ptr: xprt))
3345	return xprt;
3346	transport = container_of(xprt, struct sock_xprt, xprt);
3347
3348	xprt->prot = IPPROTO_TCP;
3349	xprt->xprt_class = &xs_tcp_transport;
3350	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3351
3352	xprt->bind_timeout = XS_BIND_TO;
3353	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3354	xprt->idle_timeout = XS_IDLE_DISC_TO;
3355
3356	xprt->ops = &xs_tcp_ops;
3357	xprt->timeout = &xs_tcp_default_timeout;
3358
3359	xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3360	if (args->reconnect_timeout)
3361	xprt->max_reconnect_timeout = args->reconnect_timeout;
3362
3363	xprt->connect_timeout = xprt->timeout->to_initval *
3364	(xprt->timeout->to_retries + 1);
3365	if (args->connect_timeout)
3366	xs_tcp_do_set_connect_timeout(xprt, connect_timeout: args->connect_timeout);
3367
3368	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3369	INIT_WORK(&transport->error_worker, xs_error_handle);
3370	INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3371
3372	switch (addr->sa_family) {
3373	case AF_INET:
3374	if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3375	xprt_set_bound(xprt);
3376
3377	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP);
3378	break;
3379	case AF_INET6:
3380	if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3381	xprt_set_bound(xprt);
3382
3383	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP6);
3384	break;
3385	default:
3386	ret = ERR_PTR(error: -EAFNOSUPPORT);
3387	goto out_err;
3388	}
3389
3390	if (xprt_bound(xprt))
3391	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3392	xprt->address_strings[RPC_DISPLAY_ADDR],
3393	xprt->address_strings[RPC_DISPLAY_PORT],
3394	xprt->address_strings[RPC_DISPLAY_PROTO]);
3395	else
3396	dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3397	xprt->address_strings[RPC_DISPLAY_ADDR],
3398	xprt->address_strings[RPC_DISPLAY_PROTO]);
3399
3400	if (try_module_get(THIS_MODULE))
3401	return xprt;
3402	ret = ERR_PTR(error: -EINVAL);
3403	out_err:
3404	xs_xprt_free(xprt);
3405	return ret;
3406	}
3407
3408	/**
3409	* xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3410	* @args: rpc transport creation arguments
3411	*
3412	*/
3413	static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3414	{
3415	struct sockaddr *addr = args->dstaddr;
3416	struct rpc_xprt *xprt;
3417	struct sock_xprt *transport;
3418	struct rpc_xprt *ret;
3419	unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3420
3421	if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3422	max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3423
3424	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3425	max_slot_table_size);
3426	if (IS_ERR(ptr: xprt))
3427	return xprt;
3428	transport = container_of(xprt, struct sock_xprt, xprt);
3429
3430	xprt->prot = IPPROTO_TCP;
3431	xprt->xprt_class = &xs_tcp_transport;
3432	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3433
3434	xprt->bind_timeout = XS_BIND_TO;
3435	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3436	xprt->idle_timeout = XS_IDLE_DISC_TO;
3437
3438	xprt->ops = &xs_tcp_ops;
3439	xprt->timeout = &xs_tcp_default_timeout;
3440
3441	xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3442	xprt->connect_timeout = xprt->timeout->to_initval *
3443	(xprt->timeout->to_retries + 1);
3444
3445	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3446	INIT_WORK(&transport->error_worker, xs_error_handle);
3447
3448	switch (args->xprtsec.policy) {
3449	case RPC_XPRTSEC_TLS_ANON:
3450	case RPC_XPRTSEC_TLS_X509:
3451	xprt->xprtsec = args->xprtsec;
3452	INIT_DELAYED_WORK(&transport->connect_worker,
3453	xs_tcp_tls_setup_socket);
3454	break;
3455	default:
3456	ret = ERR_PTR(error: -EACCES);
3457	goto out_err;
3458	}
3459
3460	switch (addr->sa_family) {
3461	case AF_INET:
3462	if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3463	xprt_set_bound(xprt);
3464
3465	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP);
3466	break;
3467	case AF_INET6:
3468	if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3469	xprt_set_bound(xprt);
3470
3471	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP6);
3472	break;
3473	default:
3474	ret = ERR_PTR(error: -EAFNOSUPPORT);
3475	goto out_err;
3476	}
3477
3478	if (xprt_bound(xprt))
3479	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3480	xprt->address_strings[RPC_DISPLAY_ADDR],
3481	xprt->address_strings[RPC_DISPLAY_PORT],
3482	xprt->address_strings[RPC_DISPLAY_PROTO]);
3483	else
3484	dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3485	xprt->address_strings[RPC_DISPLAY_ADDR],
3486	xprt->address_strings[RPC_DISPLAY_PROTO]);
3487
3488	if (try_module_get(THIS_MODULE))
3489	return xprt;
3490	ret = ERR_PTR(error: -EINVAL);
3491	out_err:
3492	xs_xprt_free(xprt);
3493	return ret;
3494	}
3495
3496	/**
3497	* xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3498	* @args: rpc transport creation arguments
3499	*
3500	*/
3501	static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3502	{
3503	struct sockaddr *addr = args->dstaddr;
3504	struct rpc_xprt *xprt;
3505	struct sock_xprt *transport;
3506	struct svc_sock *bc_sock;
3507	struct rpc_xprt *ret;
3508
3509	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3510	max_slot_table_size: xprt_tcp_slot_table_entries);
3511	if (IS_ERR(ptr: xprt))
3512	return xprt;
3513	transport = container_of(xprt, struct sock_xprt, xprt);
3514
3515	xprt->prot = IPPROTO_TCP;
3516	xprt->xprt_class = &xs_bc_tcp_transport;
3517	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3518	xprt->timeout = &xs_tcp_default_timeout;
3519
3520	/* backchannel */
3521	xprt_set_bound(xprt);
3522	xprt->bind_timeout = 0;
3523	xprt->reestablish_timeout = 0;
3524	xprt->idle_timeout = 0;
3525
3526	xprt->ops = &bc_tcp_ops;
3527
3528	switch (addr->sa_family) {
3529	case AF_INET:
3530	xs_format_peer_addresses(xprt, protocol: "tcp",
3531	RPCBIND_NETID_TCP);
3532	break;
3533	case AF_INET6:
3534	xs_format_peer_addresses(xprt, protocol: "tcp",
3535	RPCBIND_NETID_TCP6);
3536	break;
3537	default:
3538	ret = ERR_PTR(error: -EAFNOSUPPORT);
3539	goto out_err;
3540	}
3541
3542	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3543	xprt->address_strings[RPC_DISPLAY_ADDR],
3544	xprt->address_strings[RPC_DISPLAY_PORT],
3545	xprt->address_strings[RPC_DISPLAY_PROTO]);
3546
3547	/*
3548	* Once we've associated a backchannel xprt with a connection,
3549	* we want to keep it around as long as the connection lasts,
3550	* in case we need to start using it for a backchannel again;
3551	* this reference won't be dropped until bc_xprt is destroyed.
3552	*/
3553	xprt_get(xprt);
3554	args->bc_xprt->xpt_bc_xprt = xprt;
3555	xprt->bc_xprt = args->bc_xprt;
3556	bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3557	transport->sock = bc_sock->sk_sock;
3558	transport->inet = bc_sock->sk_sk;
3559
3560	/*
3561	* Since we don't want connections for the backchannel, we set
3562	* the xprt status to connected
3563	*/
3564	xprt_set_connected(xprt);
3565
3566	if (try_module_get(THIS_MODULE))
3567	return xprt;
3568
3569	args->bc_xprt->xpt_bc_xprt = NULL;
3570	args->bc_xprt->xpt_bc_xps = NULL;
3571	xprt_put(xprt);
3572	ret = ERR_PTR(error: -EINVAL);
3573	out_err:
3574	xs_xprt_free(xprt);
3575	return ret;
3576	}
3577
3578	static struct xprt_class xs_local_transport = {
3579	.list = LIST_HEAD_INIT(xs_local_transport.list),
3580	.name = "named UNIX socket",
3581	.owner = THIS_MODULE,
3582	.ident = XPRT_TRANSPORT_LOCAL,
3583	.setup = xs_setup_local,
3584	.netid = { "" },
3585	};
3586
3587	static struct xprt_class xs_udp_transport = {
3588	.list = LIST_HEAD_INIT(xs_udp_transport.list),
3589	.name = "udp",
3590	.owner = THIS_MODULE,
3591	.ident = XPRT_TRANSPORT_UDP,
3592	.setup = xs_setup_udp,
3593	.netid = { "udp", "udp6", "" },
3594	};
3595
3596	static struct xprt_class xs_tcp_transport = {
3597	.list = LIST_HEAD_INIT(xs_tcp_transport.list),
3598	.name = "tcp",
3599	.owner = THIS_MODULE,
3600	.ident = XPRT_TRANSPORT_TCP,
3601	.setup = xs_setup_tcp,
3602	.netid = { "tcp", "tcp6", "" },
3603	};
3604
3605	static struct xprt_class xs_tcp_tls_transport = {
3606	.list = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3607	.name = "tcp-with-tls",
3608	.owner = THIS_MODULE,
3609	.ident = XPRT_TRANSPORT_TCP_TLS,
3610	.setup = xs_setup_tcp_tls,
3611	.netid = { "tcp", "tcp6", "" },
3612	};
3613
3614	static struct xprt_class xs_bc_tcp_transport = {
3615	.list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3616	.name = "tcp NFSv4.1 backchannel",
3617	.owner = THIS_MODULE,
3618	.ident = XPRT_TRANSPORT_BC_TCP,
3619	.setup = xs_setup_bc_tcp,
3620	.netid = { "" },
3621	};
3622
3623	/**
3624	* init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3625	*
3626	*/
3627	int init_socket_xprt(void)
3628	{
3629	if (!sunrpc_table_header)
3630	sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3631
3632	xprt_register_transport(type: &xs_local_transport);
3633	xprt_register_transport(type: &xs_udp_transport);
3634	xprt_register_transport(type: &xs_tcp_transport);
3635	xprt_register_transport(type: &xs_tcp_tls_transport);
3636	xprt_register_transport(type: &xs_bc_tcp_transport);
3637
3638	return 0;
3639	}
3640
3641	/**
3642	* cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3643	*
3644	*/
3645	void cleanup_socket_xprt(void)
3646	{
3647	if (sunrpc_table_header) {
3648	unregister_sysctl_table(table: sunrpc_table_header);
3649	sunrpc_table_header = NULL;
3650	}
3651
3652	xprt_unregister_transport(type: &xs_local_transport);
3653	xprt_unregister_transport(type: &xs_udp_transport);
3654	xprt_unregister_transport(type: &xs_tcp_transport);
3655	xprt_unregister_transport(type: &xs_tcp_tls_transport);
3656	xprt_unregister_transport(type: &xs_bc_tcp_transport);
3657	}
3658
3659	static int param_set_portnr(const char *val, const struct kernel_param *kp)
3660	{
3661	return param_set_uint_minmax(val, kp,
3662	RPC_MIN_RESVPORT,
3663	RPC_MAX_RESVPORT);
3664	}
3665
3666	static const struct kernel_param_ops param_ops_portnr = {
3667	.set = param_set_portnr,
3668	.get = param_get_uint,
3669	};
3670
3671	#define param_check_portnr(name, p) \
3672	__param_check(name, p, unsigned int);
3673
3674	module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3675	module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3676
3677	static int param_set_slot_table_size(const char *val,
3678	const struct kernel_param *kp)
3679	{
3680	return param_set_uint_minmax(val, kp,
3681	RPC_MIN_SLOT_TABLE,
3682	RPC_MAX_SLOT_TABLE);
3683	}
3684
3685	static const struct kernel_param_ops param_ops_slot_table_size = {
3686	.set = param_set_slot_table_size,
3687	.get = param_get_uint,
3688	};
3689
3690	#define param_check_slot_table_size(name, p) \
3691	__param_check(name, p, unsigned int);
3692
3693	static int param_set_max_slot_table_size(const char *val,
3694	const struct kernel_param *kp)
3695	{
3696	return param_set_uint_minmax(val, kp,
3697	RPC_MIN_SLOT_TABLE,
3698	RPC_MAX_SLOT_TABLE_LIMIT);
3699	}
3700
3701	static const struct kernel_param_ops param_ops_max_slot_table_size = {
3702	.set = param_set_max_slot_table_size,
3703	.get = param_get_uint,
3704	};
3705
3706	#define param_check_max_slot_table_size(name, p) \
3707	__param_check(name, p, unsigned int);
3708
3709	module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3710	slot_table_size, 0644);
3711	module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3712	max_slot_table_size, 0644);
3713	module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3714	slot_table_size, 0644);
3715