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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 <linux/bvec.h>
51#include <linux/highmem.h>
52#include <linux/uio.h>
53#include <linux/sched/mm.h>
54
55#include <trace/events/sunrpc.h>
56
57#include "socklib.h"
58#include "sunrpc.h"
59
60static void xs_close(struct rpc_xprt *xprt);
61static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
62 struct socket *sock);
63
64/*
65 * xprtsock tunables
66 */
67static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
68static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
69static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
70
71static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
72static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
73
74#define XS_TCP_LINGER_TO (15U * HZ)
75static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
76
77/*
78 * We can register our own files under /proc/sys/sunrpc by
79 * calling register_sysctl_table() again. The files in that
80 * directory become the union of all files registered there.
81 *
82 * We simply need to make sure that we don't collide with
83 * someone else's file names!
84 */
85
86static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
87static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
88static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
89static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
90static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
91
92static struct ctl_table_header *sunrpc_table_header;
93
94/*
95 * FIXME: changing the UDP slot table size should also resize the UDP
96 * socket buffers for existing UDP transports
97 */
98static struct ctl_table xs_tunables_table[] = {
99 {
100 .procname = "udp_slot_table_entries",
101 .data = &xprt_udp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
104 .proc_handler = proc_dointvec_minmax,
105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
109 .procname = "tcp_slot_table_entries",
110 .data = &xprt_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_slot_table_size
116 },
117 {
118 .procname = "tcp_max_slot_table_entries",
119 .data = &xprt_max_tcp_slot_table_entries,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec_minmax,
123 .extra1 = &min_slot_table_size,
124 .extra2 = &max_tcp_slot_table_limit
125 },
126 {
127 .procname = "min_resvport",
128 .data = &xprt_min_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_minmax,
132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
135 {
136 .procname = "max_resvport",
137 .data = &xprt_max_resvport,
138 .maxlen = sizeof(unsigned int),
139 .mode = 0644,
140 .proc_handler = proc_dointvec_minmax,
141 .extra1 = &xprt_min_resvport_limit,
142 .extra2 = &xprt_max_resvport_limit
143 },
144 {
145 .procname = "tcp_fin_timeout",
146 .data = &xs_tcp_fin_timeout,
147 .maxlen = sizeof(xs_tcp_fin_timeout),
148 .mode = 0644,
149 .proc_handler = proc_dointvec_jiffies,
150 },
151 { },
152};
153
154static struct ctl_table sunrpc_table[] = {
155 {
156 .procname = "sunrpc",
157 .mode = 0555,
158 .child = xs_tunables_table
159 },
160 { },
161};
162
163/*
164 * Wait duration for a reply from the RPC portmapper.
165 */
166#define XS_BIND_TO (60U * HZ)
167
168/*
169 * Delay if a UDP socket connect error occurs. This is most likely some
170 * kind of resource problem on the local host.
171 */
172#define XS_UDP_REEST_TO (2U * HZ)
173
174/*
175 * The reestablish timeout allows clients to delay for a bit before attempting
176 * to reconnect to a server that just dropped our connection.
177 *
178 * We implement an exponential backoff when trying to reestablish a TCP
179 * transport connection with the server. Some servers like to drop a TCP
180 * connection when they are overworked, so we start with a short timeout and
181 * increase over time if the server is down or not responding.
182 */
183#define XS_TCP_INIT_REEST_TO (3U * HZ)
184
185/*
186 * TCP idle timeout; client drops the transport socket if it is idle
187 * for this long. Note that we also timeout UDP sockets to prevent
188 * holding port numbers when there is no RPC traffic.
189 */
190#define XS_IDLE_DISC_TO (5U * 60 * HZ)
191
192#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
193# undef RPC_DEBUG_DATA
194# define RPCDBG_FACILITY RPCDBG_TRANS
195#endif
196
197#ifdef RPC_DEBUG_DATA
198static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
199{
200 u8 *buf = (u8 *) packet;
201 int j;
202
203 dprintk("RPC: %s\n", msg);
204 for (j = 0; j < count && j < 128; j += 4) {
205 if (!(j & 31)) {
206 if (j)
207 dprintk("\n");
208 dprintk("0x%04x ", j);
209 }
210 dprintk("%02x%02x%02x%02x ",
211 buf[j], buf[j+1], buf[j+2], buf[j+3]);
212 }
213 dprintk("\n");
214}
215#else
216static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
217{
218 /* NOP */
219}
220#endif
221
222static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
223{
224 return (struct rpc_xprt *) sk->sk_user_data;
225}
226
227static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
228{
229 return (struct sockaddr *) &xprt->addr;
230}
231
232static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
233{
234 return (struct sockaddr_un *) &xprt->addr;
235}
236
237static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
238{
239 return (struct sockaddr_in *) &xprt->addr;
240}
241
242static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
243{
244 return (struct sockaddr_in6 *) &xprt->addr;
245}
246
247static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
248{
249 struct sockaddr *sap = xs_addr(xprt);
250 struct sockaddr_in6 *sin6;
251 struct sockaddr_in *sin;
252 struct sockaddr_un *sun;
253 char buf[128];
254
255 switch (sap->sa_family) {
256 case AF_LOCAL:
257 sun = xs_addr_un(xprt);
258 strlcpy(buf, sun->sun_path, sizeof(buf));
259 xprt->address_strings[RPC_DISPLAY_ADDR] =
260 kstrdup(buf, GFP_KERNEL);
261 break;
262 case AF_INET:
263 (void)rpc_ntop(sap, buf, sizeof(buf));
264 xprt->address_strings[RPC_DISPLAY_ADDR] =
265 kstrdup(buf, GFP_KERNEL);
266 sin = xs_addr_in(xprt);
267 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
268 break;
269 case AF_INET6:
270 (void)rpc_ntop(sap, buf, sizeof(buf));
271 xprt->address_strings[RPC_DISPLAY_ADDR] =
272 kstrdup(buf, GFP_KERNEL);
273 sin6 = xs_addr_in6(xprt);
274 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
275 break;
276 default:
277 BUG();
278 }
279
280 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
281}
282
283static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
284{
285 struct sockaddr *sap = xs_addr(xprt);
286 char buf[128];
287
288 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
289 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
290
291 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
292 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
293}
294
295static void xs_format_peer_addresses(struct rpc_xprt *xprt,
296 const char *protocol,
297 const char *netid)
298{
299 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
300 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
301 xs_format_common_peer_addresses(xprt);
302 xs_format_common_peer_ports(xprt);
303}
304
305static void xs_update_peer_port(struct rpc_xprt *xprt)
306{
307 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
308 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
309
310 xs_format_common_peer_ports(xprt);
311}
312
313static void xs_free_peer_addresses(struct rpc_xprt *xprt)
314{
315 unsigned int i;
316
317 for (i = 0; i < RPC_DISPLAY_MAX; i++)
318 switch (i) {
319 case RPC_DISPLAY_PROTO:
320 case RPC_DISPLAY_NETID:
321 continue;
322 default:
323 kfree(xprt->address_strings[i]);
324 }
325}
326
327static size_t
328xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
329{
330 size_t i,n;
331
332 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
333 return want;
334 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
335 for (i = 0; i < n; i++) {
336 if (buf->pages[i])
337 continue;
338 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
339 if (!buf->pages[i]) {
340 i *= PAGE_SIZE;
341 return i > buf->page_base ? i - buf->page_base : 0;
342 }
343 }
344 return want;
345}
346
347static ssize_t
348xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
349{
350 ssize_t ret;
351 if (seek != 0)
352 iov_iter_advance(&msg->msg_iter, seek);
353 ret = sock_recvmsg(sock, msg, flags);
354 return ret > 0 ? ret + seek : ret;
355}
356
357static ssize_t
358xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
359 struct kvec *kvec, size_t count, size_t seek)
360{
361 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
362 return xs_sock_recvmsg(sock, msg, flags, seek);
363}
364
365static ssize_t
366xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
367 struct bio_vec *bvec, unsigned long nr, size_t count,
368 size_t seek)
369{
370 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
371 return xs_sock_recvmsg(sock, msg, flags, seek);
372}
373
374static ssize_t
375xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
376 size_t count)
377{
378 iov_iter_discard(&msg->msg_iter, READ, count);
379 return sock_recvmsg(sock, msg, flags);
380}
381
382#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
383static void
384xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
385{
386 struct bvec_iter bi = {
387 .bi_size = count,
388 };
389 struct bio_vec bv;
390
391 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
392 for_each_bvec(bv, bvec, bi, bi)
393 flush_dcache_page(bv.bv_page);
394}
395#else
396static inline void
397xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
398{
399}
400#endif
401
402static ssize_t
403xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
404 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
405{
406 size_t want, seek_init = seek, offset = 0;
407 ssize_t ret;
408
409 want = min_t(size_t, count, buf->head[0].iov_len);
410 if (seek < want) {
411 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
412 if (ret <= 0)
413 goto sock_err;
414 offset += ret;
415 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
416 goto out;
417 if (ret != want)
418 goto out;
419 seek = 0;
420 } else {
421 seek -= want;
422 offset += want;
423 }
424
425 want = xs_alloc_sparse_pages(buf,
426 min_t(size_t, count - offset, buf->page_len),
427 GFP_KERNEL);
428 if (seek < want) {
429 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
430 xdr_buf_pagecount(buf),
431 want + buf->page_base,
432 seek + buf->page_base);
433 if (ret <= 0)
434 goto sock_err;
435 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
436 offset += ret - buf->page_base;
437 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
438 goto out;
439 if (ret != want)
440 goto out;
441 seek = 0;
442 } else {
443 seek -= want;
444 offset += want;
445 }
446
447 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
448 if (seek < want) {
449 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
450 if (ret <= 0)
451 goto sock_err;
452 offset += ret;
453 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
454 goto out;
455 if (ret != want)
456 goto out;
457 } else if (offset < seek_init)
458 offset = seek_init;
459 ret = -EMSGSIZE;
460out:
461 *read = offset - seek_init;
462 return ret;
463sock_err:
464 offset += seek;
465 goto out;
466}
467
468static void
469xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
470{
471 if (!transport->recv.copied) {
472 if (buf->head[0].iov_len >= transport->recv.offset)
473 memcpy(buf->head[0].iov_base,
474 &transport->recv.xid,
475 transport->recv.offset);
476 transport->recv.copied = transport->recv.offset;
477 }
478}
479
480static bool
481xs_read_stream_request_done(struct sock_xprt *transport)
482{
483 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
484}
485
486static void
487xs_read_stream_check_eor(struct sock_xprt *transport,
488 struct msghdr *msg)
489{
490 if (xs_read_stream_request_done(transport))
491 msg->msg_flags |= MSG_EOR;
492}
493
494static ssize_t
495xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
496 int flags, struct rpc_rqst *req)
497{
498 struct xdr_buf *buf = &req->rq_private_buf;
499 size_t want, read;
500 ssize_t ret;
501
502 xs_read_header(transport, buf);
503
504 want = transport->recv.len - transport->recv.offset;
505 if (want != 0) {
506 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
507 transport->recv.copied + want,
508 transport->recv.copied,
509 &read);
510 transport->recv.offset += read;
511 transport->recv.copied += read;
512 }
513
514 if (transport->recv.offset == transport->recv.len)
515 xs_read_stream_check_eor(transport, msg);
516
517 if (want == 0)
518 return 0;
519
520 switch (ret) {
521 default:
522 break;
523 case -EFAULT:
524 case -EMSGSIZE:
525 msg->msg_flags |= MSG_TRUNC;
526 return read;
527 case 0:
528 return -ESHUTDOWN;
529 }
530 return ret < 0 ? ret : read;
531}
532
533static size_t
534xs_read_stream_headersize(bool isfrag)
535{
536 if (isfrag)
537 return sizeof(__be32);
538 return 3 * sizeof(__be32);
539}
540
541static ssize_t
542xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
543 int flags, size_t want, size_t seek)
544{
545 struct kvec kvec = {
546 .iov_base = &transport->recv.fraghdr,
547 .iov_len = want,
548 };
549 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
550}
551
552#if defined(CONFIG_SUNRPC_BACKCHANNEL)
553static ssize_t
554xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
555{
556 struct rpc_xprt *xprt = &transport->xprt;
557 struct rpc_rqst *req;
558 ssize_t ret;
559
560 /* Look up and lock the request corresponding to the given XID */
561 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
562 if (!req) {
563 printk(KERN_WARNING "Callback slot table overflowed\n");
564 return -ESHUTDOWN;
565 }
566 if (transport->recv.copied && !req->rq_private_buf.len)
567 return -ESHUTDOWN;
568
569 ret = xs_read_stream_request(transport, msg, flags, req);
570 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
571 xprt_complete_bc_request(req, transport->recv.copied);
572 else
573 req->rq_private_buf.len = transport->recv.copied;
574
575 return ret;
576}
577#else /* CONFIG_SUNRPC_BACKCHANNEL */
578static ssize_t
579xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
580{
581 return -ESHUTDOWN;
582}
583#endif /* CONFIG_SUNRPC_BACKCHANNEL */
584
585static ssize_t
586xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
587{
588 struct rpc_xprt *xprt = &transport->xprt;
589 struct rpc_rqst *req;
590 ssize_t ret = 0;
591
592 /* Look up and lock the request corresponding to the given XID */
593 spin_lock(&xprt->queue_lock);
594 req = xprt_lookup_rqst(xprt, transport->recv.xid);
595 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
596 msg->msg_flags |= MSG_TRUNC;
597 goto out;
598 }
599 xprt_pin_rqst(req);
600 spin_unlock(&xprt->queue_lock);
601
602 ret = xs_read_stream_request(transport, msg, flags, req);
603
604 spin_lock(&xprt->queue_lock);
605 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
606 xprt_complete_rqst(req->rq_task, transport->recv.copied);
607 else
608 req->rq_private_buf.len = transport->recv.copied;
609 xprt_unpin_rqst(req);
610out:
611 spin_unlock(&xprt->queue_lock);
612 return ret;
613}
614
615static ssize_t
616xs_read_stream(struct sock_xprt *transport, int flags)
617{
618 struct msghdr msg = { 0 };
619 size_t want, read = 0;
620 ssize_t ret = 0;
621
622 if (transport->recv.len == 0) {
623 want = xs_read_stream_headersize(transport->recv.copied != 0);
624 ret = xs_read_stream_header(transport, &msg, flags, want,
625 transport->recv.offset);
626 if (ret <= 0)
627 goto out_err;
628 transport->recv.offset = ret;
629 if (transport->recv.offset != want)
630 return transport->recv.offset;
631 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
632 RPC_FRAGMENT_SIZE_MASK;
633 transport->recv.offset -= sizeof(transport->recv.fraghdr);
634 read = ret;
635 }
636
637 switch (be32_to_cpu(transport->recv.calldir)) {
638 default:
639 msg.msg_flags |= MSG_TRUNC;
640 break;
641 case RPC_CALL:
642 ret = xs_read_stream_call(transport, &msg, flags);
643 break;
644 case RPC_REPLY:
645 ret = xs_read_stream_reply(transport, &msg, flags);
646 }
647 if (msg.msg_flags & MSG_TRUNC) {
648 transport->recv.calldir = cpu_to_be32(-1);
649 transport->recv.copied = -1;
650 }
651 if (ret < 0)
652 goto out_err;
653 read += ret;
654 if (transport->recv.offset < transport->recv.len) {
655 if (!(msg.msg_flags & MSG_TRUNC))
656 return read;
657 msg.msg_flags = 0;
658 ret = xs_read_discard(transport->sock, &msg, flags,
659 transport->recv.len - transport->recv.offset);
660 if (ret <= 0)
661 goto out_err;
662 transport->recv.offset += ret;
663 read += ret;
664 if (transport->recv.offset != transport->recv.len)
665 return read;
666 }
667 if (xs_read_stream_request_done(transport)) {
668 trace_xs_stream_read_request(transport);
669 transport->recv.copied = 0;
670 }
671 transport->recv.offset = 0;
672 transport->recv.len = 0;
673 return read;
674out_err:
675 return ret != 0 ? ret : -ESHUTDOWN;
676}
677
678static __poll_t xs_poll_socket(struct sock_xprt *transport)
679{
680 return transport->sock->ops->poll(transport->file, transport->sock,
681 NULL);
682}
683
684static bool xs_poll_socket_readable(struct sock_xprt *transport)
685{
686 __poll_t events = xs_poll_socket(transport);
687
688 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
689}
690
691static void xs_poll_check_readable(struct sock_xprt *transport)
692{
693
694 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
695 if (!xs_poll_socket_readable(transport))
696 return;
697 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
698 queue_work(xprtiod_workqueue, &transport->recv_worker);
699}
700
701static void xs_stream_data_receive(struct sock_xprt *transport)
702{
703 size_t read = 0;
704 ssize_t ret = 0;
705
706 mutex_lock(&transport->recv_mutex);
707 if (transport->sock == NULL)
708 goto out;
709 for (;;) {
710 ret = xs_read_stream(transport, MSG_DONTWAIT);
711 if (ret < 0)
712 break;
713 read += ret;
714 cond_resched();
715 }
716 if (ret == -ESHUTDOWN)
717 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
718 else
719 xs_poll_check_readable(transport);
720out:
721 mutex_unlock(&transport->recv_mutex);
722 trace_xs_stream_read_data(&transport->xprt, ret, read);
723}
724
725static void xs_stream_data_receive_workfn(struct work_struct *work)
726{
727 struct sock_xprt *transport =
728 container_of(work, struct sock_xprt, recv_worker);
729 unsigned int pflags = memalloc_nofs_save();
730
731 xs_stream_data_receive(transport);
732 memalloc_nofs_restore(pflags);
733}
734
735static void
736xs_stream_reset_connect(struct sock_xprt *transport)
737{
738 transport->recv.offset = 0;
739 transport->recv.len = 0;
740 transport->recv.copied = 0;
741 transport->xmit.offset = 0;
742}
743
744static void
745xs_stream_start_connect(struct sock_xprt *transport)
746{
747 transport->xprt.stat.connect_count++;
748 transport->xprt.stat.connect_start = jiffies;
749}
750
751#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
752
753/**
754 * xs_nospace - handle transmit was incomplete
755 * @req: pointer to RPC request
756 *
757 */
758static int xs_nospace(struct rpc_rqst *req)
759{
760 struct rpc_xprt *xprt = req->rq_xprt;
761 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
762 struct sock *sk = transport->inet;
763 int ret = -EAGAIN;
764
765 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
766 req->rq_task->tk_pid,
767 req->rq_slen - transport->xmit.offset,
768 req->rq_slen);
769
770 /* Protect against races with write_space */
771 spin_lock(&xprt->transport_lock);
772
773 /* Don't race with disconnect */
774 if (xprt_connected(xprt)) {
775 /* wait for more buffer space */
776 sk->sk_write_pending++;
777 xprt_wait_for_buffer_space(xprt);
778 } else
779 ret = -ENOTCONN;
780
781 spin_unlock(&xprt->transport_lock);
782
783 /* Race breaker in case memory is freed before above code is called */
784 if (ret == -EAGAIN) {
785 struct socket_wq *wq;
786
787 rcu_read_lock();
788 wq = rcu_dereference(sk->sk_wq);
789 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
790 rcu_read_unlock();
791
792 sk->sk_write_space(sk);
793 }
794 return ret;
795}
796
797static void
798xs_stream_prepare_request(struct rpc_rqst *req)
799{
800 xdr_free_bvec(&req->rq_rcv_buf);
801 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
802}
803
804/*
805 * Determine if the previous message in the stream was aborted before it
806 * could complete transmission.
807 */
808static bool
809xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
810{
811 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
812}
813
814/*
815 * Return the stream record marker field for a record of length < 2^31-1
816 */
817static rpc_fraghdr
818xs_stream_record_marker(struct xdr_buf *xdr)
819{
820 if (!xdr->len)
821 return 0;
822 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
823}
824
825/**
826 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
827 * @req: pointer to RPC request
828 *
829 * Return values:
830 * 0: The request has been sent
831 * EAGAIN: The socket was blocked, please call again later to
832 * complete the request
833 * ENOTCONN: Caller needs to invoke connect logic then call again
834 * other: Some other error occured, the request was not sent
835 */
836static int xs_local_send_request(struct rpc_rqst *req)
837{
838 struct rpc_xprt *xprt = req->rq_xprt;
839 struct sock_xprt *transport =
840 container_of(xprt, struct sock_xprt, xprt);
841 struct xdr_buf *xdr = &req->rq_snd_buf;
842 rpc_fraghdr rm = xs_stream_record_marker(xdr);
843 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
844 struct msghdr msg = {
845 .msg_flags = XS_SENDMSG_FLAGS,
846 };
847 unsigned int sent;
848 int status;
849
850 /* Close the stream if the previous transmission was incomplete */
851 if (xs_send_request_was_aborted(transport, req)) {
852 xs_close(xprt);
853 return -ENOTCONN;
854 }
855
856 xs_pktdump("packet data:",
857 req->rq_svec->iov_base, req->rq_svec->iov_len);
858
859 req->rq_xtime = ktime_get();
860 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
861 transport->xmit.offset, rm, &sent);
862 dprintk("RPC: %s(%u) = %d\n",
863 __func__, xdr->len - transport->xmit.offset, status);
864
865 if (status == -EAGAIN && sock_writeable(transport->inet))
866 status = -ENOBUFS;
867
868 if (likely(sent > 0) || status == 0) {
869 transport->xmit.offset += sent;
870 req->rq_bytes_sent = transport->xmit.offset;
871 if (likely(req->rq_bytes_sent >= msglen)) {
872 req->rq_xmit_bytes_sent += transport->xmit.offset;
873 transport->xmit.offset = 0;
874 return 0;
875 }
876 status = -EAGAIN;
877 }
878
879 switch (status) {
880 case -ENOBUFS:
881 break;
882 case -EAGAIN:
883 status = xs_nospace(req);
884 break;
885 default:
886 dprintk("RPC: sendmsg returned unrecognized error %d\n",
887 -status);
888 fallthrough;
889 case -EPIPE:
890 xs_close(xprt);
891 status = -ENOTCONN;
892 }
893
894 return status;
895}
896
897/**
898 * xs_udp_send_request - write an RPC request to a UDP socket
899 * @req: pointer to RPC request
900 *
901 * Return values:
902 * 0: The request has been sent
903 * EAGAIN: The socket was blocked, please call again later to
904 * complete the request
905 * ENOTCONN: Caller needs to invoke connect logic then call again
906 * other: Some other error occurred, the request was not sent
907 */
908static int xs_udp_send_request(struct rpc_rqst *req)
909{
910 struct rpc_xprt *xprt = req->rq_xprt;
911 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
912 struct xdr_buf *xdr = &req->rq_snd_buf;
913 struct msghdr msg = {
914 .msg_name = xs_addr(xprt),
915 .msg_namelen = xprt->addrlen,
916 .msg_flags = XS_SENDMSG_FLAGS,
917 };
918 unsigned int sent;
919 int status;
920
921 xs_pktdump("packet data:",
922 req->rq_svec->iov_base,
923 req->rq_svec->iov_len);
924
925 if (!xprt_bound(xprt))
926 return -ENOTCONN;
927
928 if (!xprt_request_get_cong(xprt, req))
929 return -EBADSLT;
930
931 req->rq_xtime = ktime_get();
932 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
933
934 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
935 xdr->len, status);
936
937 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
938 if (status == -EPERM)
939 goto process_status;
940
941 if (status == -EAGAIN && sock_writeable(transport->inet))
942 status = -ENOBUFS;
943
944 if (sent > 0 || status == 0) {
945 req->rq_xmit_bytes_sent += sent;
946 if (sent >= req->rq_slen)
947 return 0;
948 /* Still some bytes left; set up for a retry later. */
949 status = -EAGAIN;
950 }
951
952process_status:
953 switch (status) {
954 case -ENOTSOCK:
955 status = -ENOTCONN;
956 /* Should we call xs_close() here? */
957 break;
958 case -EAGAIN:
959 status = xs_nospace(req);
960 break;
961 case -ENETUNREACH:
962 case -ENOBUFS:
963 case -EPIPE:
964 case -ECONNREFUSED:
965 case -EPERM:
966 /* When the server has died, an ICMP port unreachable message
967 * prompts ECONNREFUSED. */
968 break;
969 default:
970 dprintk("RPC: sendmsg returned unrecognized error %d\n",
971 -status);
972 }
973
974 return status;
975}
976
977/**
978 * xs_tcp_send_request - write an RPC request to a TCP socket
979 * @req: pointer to RPC request
980 *
981 * Return values:
982 * 0: The request has been sent
983 * EAGAIN: The socket was blocked, please call again later to
984 * complete the request
985 * ENOTCONN: Caller needs to invoke connect logic then call again
986 * other: Some other error occurred, the request was not sent
987 *
988 * XXX: In the case of soft timeouts, should we eventually give up
989 * if sendmsg is not able to make progress?
990 */
991static int xs_tcp_send_request(struct rpc_rqst *req)
992{
993 struct rpc_xprt *xprt = req->rq_xprt;
994 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
995 struct xdr_buf *xdr = &req->rq_snd_buf;
996 rpc_fraghdr rm = xs_stream_record_marker(xdr);
997 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
998 struct msghdr msg = {
999 .msg_flags = XS_SENDMSG_FLAGS,
1000 };
1001 bool vm_wait = false;
1002 unsigned int sent;
1003 int status;
1004
1005 /* Close the stream if the previous transmission was incomplete */
1006 if (xs_send_request_was_aborted(transport, req)) {
1007 if (transport->sock != NULL)
1008 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1009 return -ENOTCONN;
1010 }
1011
1012 xs_pktdump("packet data:",
1013 req->rq_svec->iov_base,
1014 req->rq_svec->iov_len);
1015
1016 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1017 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1018
1019 /* Continue transmitting the packet/record. We must be careful
1020 * to cope with writespace callbacks arriving _after_ we have
1021 * called sendmsg(). */
1022 req->rq_xtime = ktime_get();
1023 while (1) {
1024 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1025 transport->xmit.offset, rm, &sent);
1026
1027 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1028 xdr->len - transport->xmit.offset, status);
1029
1030 /* If we've sent the entire packet, immediately
1031 * reset the count of bytes sent. */
1032 transport->xmit.offset += sent;
1033 req->rq_bytes_sent = transport->xmit.offset;
1034 if (likely(req->rq_bytes_sent >= msglen)) {
1035 req->rq_xmit_bytes_sent += transport->xmit.offset;
1036 transport->xmit.offset = 0;
1037 return 0;
1038 }
1039
1040 WARN_ON_ONCE(sent == 0 && status == 0);
1041
1042 if (status == -EAGAIN ) {
1043 /*
1044 * Return EAGAIN if we're sure we're hitting the
1045 * socket send buffer limits.
1046 */
1047 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1048 break;
1049 /*
1050 * Did we hit a memory allocation failure?
1051 */
1052 if (sent == 0) {
1053 status = -ENOBUFS;
1054 if (vm_wait)
1055 break;
1056 /* Retry, knowing now that we're below the
1057 * socket send buffer limit
1058 */
1059 vm_wait = true;
1060 }
1061 continue;
1062 }
1063 if (status < 0)
1064 break;
1065 vm_wait = false;
1066 }
1067
1068 switch (status) {
1069 case -ENOTSOCK:
1070 status = -ENOTCONN;
1071 /* Should we call xs_close() here? */
1072 break;
1073 case -EAGAIN:
1074 status = xs_nospace(req);
1075 break;
1076 case -ECONNRESET:
1077 case -ECONNREFUSED:
1078 case -ENOTCONN:
1079 case -EADDRINUSE:
1080 case -ENOBUFS:
1081 case -EPIPE:
1082 break;
1083 default:
1084 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1085 -status);
1086 }
1087
1088 return status;
1089}
1090
1091static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1092{
1093 transport->old_data_ready = sk->sk_data_ready;
1094 transport->old_state_change = sk->sk_state_change;
1095 transport->old_write_space = sk->sk_write_space;
1096 transport->old_error_report = sk->sk_error_report;
1097}
1098
1099static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1100{
1101 sk->sk_data_ready = transport->old_data_ready;
1102 sk->sk_state_change = transport->old_state_change;
1103 sk->sk_write_space = transport->old_write_space;
1104 sk->sk_error_report = transport->old_error_report;
1105}
1106
1107static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1108{
1109 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1110
1111 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1112 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1113 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1114 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1115}
1116
1117static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1118{
1119 set_bit(nr, &transport->sock_state);
1120 queue_work(xprtiod_workqueue, &transport->error_worker);
1121}
1122
1123static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1124{
1125 smp_mb__before_atomic();
1126 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1127 clear_bit(XPRT_CLOSING, &xprt->state);
1128 xs_sock_reset_state_flags(xprt);
1129 smp_mb__after_atomic();
1130}
1131
1132/**
1133 * xs_error_report - callback to handle TCP socket state errors
1134 * @sk: socket
1135 *
1136 * Note: we don't call sock_error() since there may be a rpc_task
1137 * using the socket, and so we don't want to clear sk->sk_err.
1138 */
1139static void xs_error_report(struct sock *sk)
1140{
1141 struct sock_xprt *transport;
1142 struct rpc_xprt *xprt;
1143
1144 read_lock_bh(&sk->sk_callback_lock);
1145 if (!(xprt = xprt_from_sock(sk)))
1146 goto out;
1147
1148 transport = container_of(xprt, struct sock_xprt, xprt);
1149 transport->xprt_err = -sk->sk_err;
1150 if (transport->xprt_err == 0)
1151 goto out;
1152 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1153 xprt, -transport->xprt_err);
1154 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1155
1156 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1157 smp_mb__before_atomic();
1158 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1159 out:
1160 read_unlock_bh(&sk->sk_callback_lock);
1161}
1162
1163static void xs_reset_transport(struct sock_xprt *transport)
1164{
1165 struct socket *sock = transport->sock;
1166 struct sock *sk = transport->inet;
1167 struct rpc_xprt *xprt = &transport->xprt;
1168 struct file *filp = transport->file;
1169
1170 if (sk == NULL)
1171 return;
1172
1173 if (atomic_read(&transport->xprt.swapper))
1174 sk_clear_memalloc(sk);
1175
1176 kernel_sock_shutdown(sock, SHUT_RDWR);
1177
1178 mutex_lock(&transport->recv_mutex);
1179 write_lock_bh(&sk->sk_callback_lock);
1180 transport->inet = NULL;
1181 transport->sock = NULL;
1182 transport->file = NULL;
1183
1184 sk->sk_user_data = NULL;
1185
1186 xs_restore_old_callbacks(transport, sk);
1187 xprt_clear_connected(xprt);
1188 write_unlock_bh(&sk->sk_callback_lock);
1189 xs_sock_reset_connection_flags(xprt);
1190 /* Reset stream record info */
1191 xs_stream_reset_connect(transport);
1192 mutex_unlock(&transport->recv_mutex);
1193
1194 trace_rpc_socket_close(xprt, sock);
1195 fput(filp);
1196
1197 xprt_disconnect_done(xprt);
1198}
1199
1200/**
1201 * xs_close - close a socket
1202 * @xprt: transport
1203 *
1204 * This is used when all requests are complete; ie, no DRC state remains
1205 * on the server we want to save.
1206 *
1207 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1208 * xs_reset_transport() zeroing the socket from underneath a writer.
1209 */
1210static void xs_close(struct rpc_xprt *xprt)
1211{
1212 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1213
1214 dprintk("RPC: xs_close xprt %p\n", xprt);
1215
1216 xs_reset_transport(transport);
1217 xprt->reestablish_timeout = 0;
1218}
1219
1220static void xs_inject_disconnect(struct rpc_xprt *xprt)
1221{
1222 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1223 xprt);
1224 xprt_disconnect_done(xprt);
1225}
1226
1227static void xs_xprt_free(struct rpc_xprt *xprt)
1228{
1229 xs_free_peer_addresses(xprt);
1230 xprt_free(xprt);
1231}
1232
1233/**
1234 * xs_destroy - prepare to shutdown a transport
1235 * @xprt: doomed transport
1236 *
1237 */
1238static void xs_destroy(struct rpc_xprt *xprt)
1239{
1240 struct sock_xprt *transport = container_of(xprt,
1241 struct sock_xprt, xprt);
1242 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1243
1244 cancel_delayed_work_sync(&transport->connect_worker);
1245 xs_close(xprt);
1246 cancel_work_sync(&transport->recv_worker);
1247 cancel_work_sync(&transport->error_worker);
1248 xs_xprt_free(xprt);
1249 module_put(THIS_MODULE);
1250}
1251
1252/**
1253 * xs_udp_data_read_skb - receive callback for UDP sockets
1254 * @xprt: transport
1255 * @sk: socket
1256 * @skb: skbuff
1257 *
1258 */
1259static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1260 struct sock *sk,
1261 struct sk_buff *skb)
1262{
1263 struct rpc_task *task;
1264 struct rpc_rqst *rovr;
1265 int repsize, copied;
1266 u32 _xid;
1267 __be32 *xp;
1268
1269 repsize = skb->len;
1270 if (repsize < 4) {
1271 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1272 return;
1273 }
1274
1275 /* Copy the XID from the skb... */
1276 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1277 if (xp == NULL)
1278 return;
1279
1280 /* Look up and lock the request corresponding to the given XID */
1281 spin_lock(&xprt->queue_lock);
1282 rovr = xprt_lookup_rqst(xprt, *xp);
1283 if (!rovr)
1284 goto out_unlock;
1285 xprt_pin_rqst(rovr);
1286 xprt_update_rtt(rovr->rq_task);
1287 spin_unlock(&xprt->queue_lock);
1288 task = rovr->rq_task;
1289
1290 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1291 copied = repsize;
1292
1293 /* Suck it into the iovec, verify checksum if not done by hw. */
1294 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1295 spin_lock(&xprt->queue_lock);
1296 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1297 goto out_unpin;
1298 }
1299
1300
1301 spin_lock(&xprt->transport_lock);
1302 xprt_adjust_cwnd(xprt, task, copied);
1303 spin_unlock(&xprt->transport_lock);
1304 spin_lock(&xprt->queue_lock);
1305 xprt_complete_rqst(task, copied);
1306 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1307out_unpin:
1308 xprt_unpin_rqst(rovr);
1309 out_unlock:
1310 spin_unlock(&xprt->queue_lock);
1311}
1312
1313static void xs_udp_data_receive(struct sock_xprt *transport)
1314{
1315 struct sk_buff *skb;
1316 struct sock *sk;
1317 int err;
1318
1319 mutex_lock(&transport->recv_mutex);
1320 sk = transport->inet;
1321 if (sk == NULL)
1322 goto out;
1323 for (;;) {
1324 skb = skb_recv_udp(sk, 0, 1, &err);
1325 if (skb == NULL)
1326 break;
1327 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1328 consume_skb(skb);
1329 cond_resched();
1330 }
1331 xs_poll_check_readable(transport);
1332out:
1333 mutex_unlock(&transport->recv_mutex);
1334}
1335
1336static void xs_udp_data_receive_workfn(struct work_struct *work)
1337{
1338 struct sock_xprt *transport =
1339 container_of(work, struct sock_xprt, recv_worker);
1340 unsigned int pflags = memalloc_nofs_save();
1341
1342 xs_udp_data_receive(transport);
1343 memalloc_nofs_restore(pflags);
1344}
1345
1346/**
1347 * xs_data_ready - "data ready" callback for UDP sockets
1348 * @sk: socket with data to read
1349 *
1350 */
1351static void xs_data_ready(struct sock *sk)
1352{
1353 struct rpc_xprt *xprt;
1354
1355 read_lock_bh(&sk->sk_callback_lock);
1356 dprintk("RPC: xs_data_ready...\n");
1357 xprt = xprt_from_sock(sk);
1358 if (xprt != NULL) {
1359 struct sock_xprt *transport = container_of(xprt,
1360 struct sock_xprt, xprt);
1361 transport->old_data_ready(sk);
1362 /* Any data means we had a useful conversation, so
1363 * then we don't need to delay the next reconnect
1364 */
1365 if (xprt->reestablish_timeout)
1366 xprt->reestablish_timeout = 0;
1367 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1368 queue_work(xprtiod_workqueue, &transport->recv_worker);
1369 }
1370 read_unlock_bh(&sk->sk_callback_lock);
1371}
1372
1373/*
1374 * Helper function to force a TCP close if the server is sending
1375 * junk and/or it has put us in CLOSE_WAIT
1376 */
1377static void xs_tcp_force_close(struct rpc_xprt *xprt)
1378{
1379 xprt_force_disconnect(xprt);
1380}
1381
1382#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1383static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1384{
1385 return PAGE_SIZE;
1386}
1387#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1388
1389/**
1390 * xs_tcp_state_change - callback to handle TCP socket state changes
1391 * @sk: socket whose state has changed
1392 *
1393 */
1394static void xs_tcp_state_change(struct sock *sk)
1395{
1396 struct rpc_xprt *xprt;
1397 struct sock_xprt *transport;
1398
1399 read_lock_bh(&sk->sk_callback_lock);
1400 if (!(xprt = xprt_from_sock(sk)))
1401 goto out;
1402 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1403 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1404 sk->sk_state, xprt_connected(xprt),
1405 sock_flag(sk, SOCK_DEAD),
1406 sock_flag(sk, SOCK_ZAPPED),
1407 sk->sk_shutdown);
1408
1409 transport = container_of(xprt, struct sock_xprt, xprt);
1410 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1411 switch (sk->sk_state) {
1412 case TCP_ESTABLISHED:
1413 if (!xprt_test_and_set_connected(xprt)) {
1414 xprt->connect_cookie++;
1415 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1416 xprt_clear_connecting(xprt);
1417
1418 xprt->stat.connect_count++;
1419 xprt->stat.connect_time += (long)jiffies -
1420 xprt->stat.connect_start;
1421 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1422 }
1423 break;
1424 case TCP_FIN_WAIT1:
1425 /* The client initiated a shutdown of the socket */
1426 xprt->connect_cookie++;
1427 xprt->reestablish_timeout = 0;
1428 set_bit(XPRT_CLOSING, &xprt->state);
1429 smp_mb__before_atomic();
1430 clear_bit(XPRT_CONNECTED, &xprt->state);
1431 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1432 smp_mb__after_atomic();
1433 break;
1434 case TCP_CLOSE_WAIT:
1435 /* The server initiated a shutdown of the socket */
1436 xprt->connect_cookie++;
1437 clear_bit(XPRT_CONNECTED, &xprt->state);
1438 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1439 fallthrough;
1440 case TCP_CLOSING:
1441 /*
1442 * If the server closed down the connection, make sure that
1443 * we back off before reconnecting
1444 */
1445 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1446 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1447 break;
1448 case TCP_LAST_ACK:
1449 set_bit(XPRT_CLOSING, &xprt->state);
1450 smp_mb__before_atomic();
1451 clear_bit(XPRT_CONNECTED, &xprt->state);
1452 smp_mb__after_atomic();
1453 break;
1454 case TCP_CLOSE:
1455 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1456 &transport->sock_state))
1457 xprt_clear_connecting(xprt);
1458 clear_bit(XPRT_CLOSING, &xprt->state);
1459 /* Trigger the socket release */
1460 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1461 }
1462 out:
1463 read_unlock_bh(&sk->sk_callback_lock);
1464}
1465
1466static void xs_write_space(struct sock *sk)
1467{
1468 struct socket_wq *wq;
1469 struct sock_xprt *transport;
1470 struct rpc_xprt *xprt;
1471
1472 if (!sk->sk_socket)
1473 return;
1474 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1475
1476 if (unlikely(!(xprt = xprt_from_sock(sk))))
1477 return;
1478 transport = container_of(xprt, struct sock_xprt, xprt);
1479 rcu_read_lock();
1480 wq = rcu_dereference(sk->sk_wq);
1481 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1482 goto out;
1483
1484 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1485 sk->sk_write_pending--;
1486out:
1487 rcu_read_unlock();
1488}
1489
1490/**
1491 * xs_udp_write_space - callback invoked when socket buffer space
1492 * becomes available
1493 * @sk: socket whose state has changed
1494 *
1495 * Called when more output buffer space is available for this socket.
1496 * We try not to wake our writers until they can make "significant"
1497 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1498 * with a bunch of small requests.
1499 */
1500static void xs_udp_write_space(struct sock *sk)
1501{
1502 read_lock_bh(&sk->sk_callback_lock);
1503
1504 /* from net/core/sock.c:sock_def_write_space */
1505 if (sock_writeable(sk))
1506 xs_write_space(sk);
1507
1508 read_unlock_bh(&sk->sk_callback_lock);
1509}
1510
1511/**
1512 * xs_tcp_write_space - callback invoked when socket buffer space
1513 * becomes available
1514 * @sk: socket whose state has changed
1515 *
1516 * Called when more output buffer space is available for this socket.
1517 * We try not to wake our writers until they can make "significant"
1518 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1519 * with a bunch of small requests.
1520 */
1521static void xs_tcp_write_space(struct sock *sk)
1522{
1523 read_lock_bh(&sk->sk_callback_lock);
1524
1525 /* from net/core/stream.c:sk_stream_write_space */
1526 if (sk_stream_is_writeable(sk))
1527 xs_write_space(sk);
1528
1529 read_unlock_bh(&sk->sk_callback_lock);
1530}
1531
1532static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1533{
1534 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1535 struct sock *sk = transport->inet;
1536
1537 if (transport->rcvsize) {
1538 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1539 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1540 }
1541 if (transport->sndsize) {
1542 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1543 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1544 sk->sk_write_space(sk);
1545 }
1546}
1547
1548/**
1549 * xs_udp_set_buffer_size - set send and receive limits
1550 * @xprt: generic transport
1551 * @sndsize: requested size of send buffer, in bytes
1552 * @rcvsize: requested size of receive buffer, in bytes
1553 *
1554 * Set socket send and receive buffer size limits.
1555 */
1556static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1557{
1558 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1559
1560 transport->sndsize = 0;
1561 if (sndsize)
1562 transport->sndsize = sndsize + 1024;
1563 transport->rcvsize = 0;
1564 if (rcvsize)
1565 transport->rcvsize = rcvsize + 1024;
1566
1567 xs_udp_do_set_buffer_size(xprt);
1568}
1569
1570/**
1571 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1572 * @xprt: controlling transport
1573 * @task: task that timed out
1574 *
1575 * Adjust the congestion window after a retransmit timeout has occurred.
1576 */
1577static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1578{
1579 spin_lock(&xprt->transport_lock);
1580 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1581 spin_unlock(&xprt->transport_lock);
1582}
1583
1584static int xs_get_random_port(void)
1585{
1586 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1587 unsigned short range;
1588 unsigned short rand;
1589
1590 if (max < min)
1591 return -EADDRINUSE;
1592 range = max - min + 1;
1593 rand = (unsigned short) prandom_u32() % range;
1594 return rand + min;
1595}
1596
1597static unsigned short xs_sock_getport(struct socket *sock)
1598{
1599 struct sockaddr_storage buf;
1600 unsigned short port = 0;
1601
1602 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1603 goto out;
1604 switch (buf.ss_family) {
1605 case AF_INET6:
1606 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1607 break;
1608 case AF_INET:
1609 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1610 }
1611out:
1612 return port;
1613}
1614
1615/**
1616 * xs_set_port - reset the port number in the remote endpoint address
1617 * @xprt: generic transport
1618 * @port: new port number
1619 *
1620 */
1621static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1622{
1623 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1624
1625 rpc_set_port(xs_addr(xprt), port);
1626 xs_update_peer_port(xprt);
1627}
1628
1629static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1630{
1631 if (transport->srcport == 0 && transport->xprt.reuseport)
1632 transport->srcport = xs_sock_getport(sock);
1633}
1634
1635static int xs_get_srcport(struct sock_xprt *transport)
1636{
1637 int port = transport->srcport;
1638
1639 if (port == 0 && transport->xprt.resvport)
1640 port = xs_get_random_port();
1641 return port;
1642}
1643
1644static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1645{
1646 if (transport->srcport != 0)
1647 transport->srcport = 0;
1648 if (!transport->xprt.resvport)
1649 return 0;
1650 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1651 return xprt_max_resvport;
1652 return --port;
1653}
1654static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1655{
1656 struct sockaddr_storage myaddr;
1657 int err, nloop = 0;
1658 int port = xs_get_srcport(transport);
1659 unsigned short last;
1660
1661 /*
1662 * If we are asking for any ephemeral port (i.e. port == 0 &&
1663 * transport->xprt.resvport == 0), don't bind. Let the local
1664 * port selection happen implicitly when the socket is used
1665 * (for example at connect time).
1666 *
1667 * This ensures that we can continue to establish TCP
1668 * connections even when all local ephemeral ports are already
1669 * a part of some TCP connection. This makes no difference
1670 * for UDP sockets, but also doens't harm them.
1671 *
1672 * If we're asking for any reserved port (i.e. port == 0 &&
1673 * transport->xprt.resvport == 1) xs_get_srcport above will
1674 * ensure that port is non-zero and we will bind as needed.
1675 */
1676 if (port <= 0)
1677 return port;
1678
1679 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1680 do {
1681 rpc_set_port((struct sockaddr *)&myaddr, port);
1682 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1683 transport->xprt.addrlen);
1684 if (err == 0) {
1685 transport->srcport = port;
1686 break;
1687 }
1688 last = port;
1689 port = xs_next_srcport(transport, port);
1690 if (port > last)
1691 nloop++;
1692 } while (err == -EADDRINUSE && nloop != 2);
1693
1694 if (myaddr.ss_family == AF_INET)
1695 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1696 &((struct sockaddr_in *)&myaddr)->sin_addr,
1697 port, err ? "failed" : "ok", err);
1698 else
1699 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1700 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1701 port, err ? "failed" : "ok", err);
1702 return err;
1703}
1704
1705/*
1706 * We don't support autobind on AF_LOCAL sockets
1707 */
1708static void xs_local_rpcbind(struct rpc_task *task)
1709{
1710 xprt_set_bound(task->tk_xprt);
1711}
1712
1713static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1714{
1715}
1716
1717#ifdef CONFIG_DEBUG_LOCK_ALLOC
1718static struct lock_class_key xs_key[2];
1719static struct lock_class_key xs_slock_key[2];
1720
1721static inline void xs_reclassify_socketu(struct socket *sock)
1722{
1723 struct sock *sk = sock->sk;
1724
1725 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1726 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1727}
1728
1729static inline void xs_reclassify_socket4(struct socket *sock)
1730{
1731 struct sock *sk = sock->sk;
1732
1733 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1734 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1735}
1736
1737static inline void xs_reclassify_socket6(struct socket *sock)
1738{
1739 struct sock *sk = sock->sk;
1740
1741 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1742 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1743}
1744
1745static inline void xs_reclassify_socket(int family, struct socket *sock)
1746{
1747 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1748 return;
1749
1750 switch (family) {
1751 case AF_LOCAL:
1752 xs_reclassify_socketu(sock);
1753 break;
1754 case AF_INET:
1755 xs_reclassify_socket4(sock);
1756 break;
1757 case AF_INET6:
1758 xs_reclassify_socket6(sock);
1759 break;
1760 }
1761}
1762#else
1763static inline void xs_reclassify_socket(int family, struct socket *sock)
1764{
1765}
1766#endif
1767
1768static void xs_dummy_setup_socket(struct work_struct *work)
1769{
1770}
1771
1772static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1773 struct sock_xprt *transport, int family, int type,
1774 int protocol, bool reuseport)
1775{
1776 struct file *filp;
1777 struct socket *sock;
1778 int err;
1779
1780 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1781 if (err < 0) {
1782 dprintk("RPC: can't create %d transport socket (%d).\n",
1783 protocol, -err);
1784 goto out;
1785 }
1786 xs_reclassify_socket(family, sock);
1787
1788 if (reuseport)
1789 sock_set_reuseport(sock->sk);
1790
1791 err = xs_bind(transport, sock);
1792 if (err) {
1793 sock_release(sock);
1794 goto out;
1795 }
1796
1797 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1798 if (IS_ERR(filp))
1799 return ERR_CAST(filp);
1800 transport->file = filp;
1801
1802 return sock;
1803out:
1804 return ERR_PTR(err);
1805}
1806
1807static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1808 struct socket *sock)
1809{
1810 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1811 xprt);
1812
1813 if (!transport->inet) {
1814 struct sock *sk = sock->sk;
1815
1816 write_lock_bh(&sk->sk_callback_lock);
1817
1818 xs_save_old_callbacks(transport, sk);
1819
1820 sk->sk_user_data = xprt;
1821 sk->sk_data_ready = xs_data_ready;
1822 sk->sk_write_space = xs_udp_write_space;
1823 sock_set_flag(sk, SOCK_FASYNC);
1824 sk->sk_error_report = xs_error_report;
1825
1826 xprt_clear_connected(xprt);
1827
1828 /* Reset to new socket */
1829 transport->sock = sock;
1830 transport->inet = sk;
1831
1832 write_unlock_bh(&sk->sk_callback_lock);
1833 }
1834
1835 xs_stream_start_connect(transport);
1836
1837 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1838}
1839
1840/**
1841 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1842 * @transport: socket transport to connect
1843 */
1844static int xs_local_setup_socket(struct sock_xprt *transport)
1845{
1846 struct rpc_xprt *xprt = &transport->xprt;
1847 struct file *filp;
1848 struct socket *sock;
1849 int status;
1850
1851 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1852 SOCK_STREAM, 0, &sock, 1);
1853 if (status < 0) {
1854 dprintk("RPC: can't create AF_LOCAL "
1855 "transport socket (%d).\n", -status);
1856 goto out;
1857 }
1858 xs_reclassify_socket(AF_LOCAL, sock);
1859
1860 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1861 if (IS_ERR(filp)) {
1862 status = PTR_ERR(filp);
1863 goto out;
1864 }
1865 transport->file = filp;
1866
1867 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1868 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1869
1870 status = xs_local_finish_connecting(xprt, sock);
1871 trace_rpc_socket_connect(xprt, sock, status);
1872 switch (status) {
1873 case 0:
1874 dprintk("RPC: xprt %p connected to %s\n",
1875 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1876 xprt->stat.connect_count++;
1877 xprt->stat.connect_time += (long)jiffies -
1878 xprt->stat.connect_start;
1879 xprt_set_connected(xprt);
1880 case -ENOBUFS:
1881 break;
1882 case -ENOENT:
1883 dprintk("RPC: xprt %p: socket %s does not exist\n",
1884 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1885 break;
1886 case -ECONNREFUSED:
1887 dprintk("RPC: xprt %p: connection refused for %s\n",
1888 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1889 break;
1890 default:
1891 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1892 __func__, -status,
1893 xprt->address_strings[RPC_DISPLAY_ADDR]);
1894 }
1895
1896out:
1897 xprt_clear_connecting(xprt);
1898 xprt_wake_pending_tasks(xprt, status);
1899 return status;
1900}
1901
1902static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1903{
1904 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1905 int ret;
1906
1907 if (RPC_IS_ASYNC(task)) {
1908 /*
1909 * We want the AF_LOCAL connect to be resolved in the
1910 * filesystem namespace of the process making the rpc
1911 * call. Thus we connect synchronously.
1912 *
1913 * If we want to support asynchronous AF_LOCAL calls,
1914 * we'll need to figure out how to pass a namespace to
1915 * connect.
1916 */
1917 task->tk_rpc_status = -ENOTCONN;
1918 rpc_exit(task, -ENOTCONN);
1919 return;
1920 }
1921 ret = xs_local_setup_socket(transport);
1922 if (ret && !RPC_IS_SOFTCONN(task))
1923 msleep_interruptible(15000);
1924}
1925
1926#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1927/*
1928 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1929 * know that we have exclusive access to the socket), to guard against
1930 * races with xs_reset_transport.
1931 */
1932static void xs_set_memalloc(struct rpc_xprt *xprt)
1933{
1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1935 xprt);
1936
1937 /*
1938 * If there's no sock, then we have nothing to set. The
1939 * reconnecting process will get it for us.
1940 */
1941 if (!transport->inet)
1942 return;
1943 if (atomic_read(&xprt->swapper))
1944 sk_set_memalloc(transport->inet);
1945}
1946
1947/**
1948 * xs_enable_swap - Tag this transport as being used for swap.
1949 * @xprt: transport to tag
1950 *
1951 * Take a reference to this transport on behalf of the rpc_clnt, and
1952 * optionally mark it for swapping if it wasn't already.
1953 */
1954static int
1955xs_enable_swap(struct rpc_xprt *xprt)
1956{
1957 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
1958
1959 if (atomic_inc_return(&xprt->swapper) != 1)
1960 return 0;
1961 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1962 return -ERESTARTSYS;
1963 if (xs->inet)
1964 sk_set_memalloc(xs->inet);
1965 xprt_release_xprt(xprt, NULL);
1966 return 0;
1967}
1968
1969/**
1970 * xs_disable_swap - Untag this transport as being used for swap.
1971 * @xprt: transport to tag
1972 *
1973 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
1974 * swapper refcount goes to 0, untag the socket as a memalloc socket.
1975 */
1976static void
1977xs_disable_swap(struct rpc_xprt *xprt)
1978{
1979 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
1980
1981 if (!atomic_dec_and_test(&xprt->swapper))
1982 return;
1983 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1984 return;
1985 if (xs->inet)
1986 sk_clear_memalloc(xs->inet);
1987 xprt_release_xprt(xprt, NULL);
1988}
1989#else
1990static void xs_set_memalloc(struct rpc_xprt *xprt)
1991{
1992}
1993
1994static int
1995xs_enable_swap(struct rpc_xprt *xprt)
1996{
1997 return -EINVAL;
1998}
1999
2000static void
2001xs_disable_swap(struct rpc_xprt *xprt)
2002{
2003}
2004#endif
2005
2006static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2007{
2008 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2009
2010 if (!transport->inet) {
2011 struct sock *sk = sock->sk;
2012
2013 write_lock_bh(&sk->sk_callback_lock);
2014
2015 xs_save_old_callbacks(transport, sk);
2016
2017 sk->sk_user_data = xprt;
2018 sk->sk_data_ready = xs_data_ready;
2019 sk->sk_write_space = xs_udp_write_space;
2020 sock_set_flag(sk, SOCK_FASYNC);
2021
2022 xprt_set_connected(xprt);
2023
2024 /* Reset to new socket */
2025 transport->sock = sock;
2026 transport->inet = sk;
2027
2028 xs_set_memalloc(xprt);
2029
2030 write_unlock_bh(&sk->sk_callback_lock);
2031 }
2032 xs_udp_do_set_buffer_size(xprt);
2033
2034 xprt->stat.connect_start = jiffies;
2035}
2036
2037static void xs_udp_setup_socket(struct work_struct *work)
2038{
2039 struct sock_xprt *transport =
2040 container_of(work, struct sock_xprt, connect_worker.work);
2041 struct rpc_xprt *xprt = &transport->xprt;
2042 struct socket *sock;
2043 int status = -EIO;
2044
2045 sock = xs_create_sock(xprt, transport,
2046 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2047 IPPROTO_UDP, false);
2048 if (IS_ERR(sock))
2049 goto out;
2050
2051 dprintk("RPC: worker connecting xprt %p via %s to "
2052 "%s (port %s)\n", xprt,
2053 xprt->address_strings[RPC_DISPLAY_PROTO],
2054 xprt->address_strings[RPC_DISPLAY_ADDR],
2055 xprt->address_strings[RPC_DISPLAY_PORT]);
2056
2057 xs_udp_finish_connecting(xprt, sock);
2058 trace_rpc_socket_connect(xprt, sock, 0);
2059 status = 0;
2060out:
2061 xprt_clear_connecting(xprt);
2062 xprt_unlock_connect(xprt, transport);
2063 xprt_wake_pending_tasks(xprt, status);
2064}
2065
2066/**
2067 * xs_tcp_shutdown - gracefully shut down a TCP socket
2068 * @xprt: transport
2069 *
2070 * Initiates a graceful shutdown of the TCP socket by calling the
2071 * equivalent of shutdown(SHUT_RDWR);
2072 */
2073static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2074{
2075 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2076 struct socket *sock = transport->sock;
2077 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2078
2079 if (sock == NULL)
2080 return;
2081 switch (skst) {
2082 default:
2083 kernel_sock_shutdown(sock, SHUT_RDWR);
2084 trace_rpc_socket_shutdown(xprt, sock);
2085 break;
2086 case TCP_CLOSE:
2087 case TCP_TIME_WAIT:
2088 xs_reset_transport(transport);
2089 }
2090}
2091
2092static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2093 struct socket *sock)
2094{
2095 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2096 unsigned int keepidle;
2097 unsigned int keepcnt;
2098 unsigned int timeo;
2099
2100 spin_lock(&xprt->transport_lock);
2101 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2102 keepcnt = xprt->timeout->to_retries + 1;
2103 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2104 (xprt->timeout->to_retries + 1);
2105 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2106 spin_unlock(&xprt->transport_lock);
2107
2108 /* TCP Keepalive options */
2109 sock_set_keepalive(sock->sk);
2110 tcp_sock_set_keepidle(sock->sk, keepidle);
2111 tcp_sock_set_keepintvl(sock->sk, keepidle);
2112 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2113
2114 /* TCP user timeout (see RFC5482) */
2115 tcp_sock_set_user_timeout(sock->sk, timeo);
2116}
2117
2118static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2119 unsigned long connect_timeout,
2120 unsigned long reconnect_timeout)
2121{
2122 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2123 struct rpc_timeout to;
2124 unsigned long initval;
2125
2126 spin_lock(&xprt->transport_lock);
2127 if (reconnect_timeout < xprt->max_reconnect_timeout)
2128 xprt->max_reconnect_timeout = reconnect_timeout;
2129 if (connect_timeout < xprt->connect_timeout) {
2130 memcpy(&to, xprt->timeout, sizeof(to));
2131 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2132 /* Arbitrary lower limit */
2133 if (initval < XS_TCP_INIT_REEST_TO << 1)
2134 initval = XS_TCP_INIT_REEST_TO << 1;
2135 to.to_initval = initval;
2136 to.to_maxval = initval;
2137 memcpy(&transport->tcp_timeout, &to,
2138 sizeof(transport->tcp_timeout));
2139 xprt->timeout = &transport->tcp_timeout;
2140 xprt->connect_timeout = connect_timeout;
2141 }
2142 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2143 spin_unlock(&xprt->transport_lock);
2144}
2145
2146static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2147{
2148 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2149 int ret = -ENOTCONN;
2150
2151 if (!transport->inet) {
2152 struct sock *sk = sock->sk;
2153
2154 /* Avoid temporary address, they are bad for long-lived
2155 * connections such as NFS mounts.
2156 * RFC4941, section 3.6 suggests that:
2157 * Individual applications, which have specific
2158 * knowledge about the normal duration of connections,
2159 * MAY override this as appropriate.
2160 */
2161 if (xs_addr(xprt)->sa_family == PF_INET6) {
2162 ip6_sock_set_addr_preferences(sk,
2163 IPV6_PREFER_SRC_PUBLIC);
2164 }
2165
2166 xs_tcp_set_socket_timeouts(xprt, sock);
2167
2168 write_lock_bh(&sk->sk_callback_lock);
2169
2170 xs_save_old_callbacks(transport, sk);
2171
2172 sk->sk_user_data = xprt;
2173 sk->sk_data_ready = xs_data_ready;
2174 sk->sk_state_change = xs_tcp_state_change;
2175 sk->sk_write_space = xs_tcp_write_space;
2176 sock_set_flag(sk, SOCK_FASYNC);
2177 sk->sk_error_report = xs_error_report;
2178
2179 /* socket options */
2180 sock_reset_flag(sk, SOCK_LINGER);
2181 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2182
2183 xprt_clear_connected(xprt);
2184
2185 /* Reset to new socket */
2186 transport->sock = sock;
2187 transport->inet = sk;
2188
2189 write_unlock_bh(&sk->sk_callback_lock);
2190 }
2191
2192 if (!xprt_bound(xprt))
2193 goto out;
2194
2195 xs_set_memalloc(xprt);
2196
2197 xs_stream_start_connect(transport);
2198
2199 /* Tell the socket layer to start connecting... */
2200 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2201 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2202 switch (ret) {
2203 case 0:
2204 xs_set_srcport(transport, sock);
2205 fallthrough;
2206 case -EINPROGRESS:
2207 /* SYN_SENT! */
2208 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2209 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2210 break;
2211 case -EADDRNOTAVAIL:
2212 /* Source port number is unavailable. Try a new one! */
2213 transport->srcport = 0;
2214 }
2215out:
2216 return ret;
2217}
2218
2219/**
2220 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2221 * @work: queued work item
2222 *
2223 * Invoked by a work queue tasklet.
2224 */
2225static void xs_tcp_setup_socket(struct work_struct *work)
2226{
2227 struct sock_xprt *transport =
2228 container_of(work, struct sock_xprt, connect_worker.work);
2229 struct socket *sock = transport->sock;
2230 struct rpc_xprt *xprt = &transport->xprt;
2231 int status = -EIO;
2232
2233 if (!sock) {
2234 sock = xs_create_sock(xprt, transport,
2235 xs_addr(xprt)->sa_family, SOCK_STREAM,
2236 IPPROTO_TCP, true);
2237 if (IS_ERR(sock)) {
2238 status = PTR_ERR(sock);
2239 goto out;
2240 }
2241 }
2242
2243 dprintk("RPC: worker connecting xprt %p via %s to "
2244 "%s (port %s)\n", xprt,
2245 xprt->address_strings[RPC_DISPLAY_PROTO],
2246 xprt->address_strings[RPC_DISPLAY_ADDR],
2247 xprt->address_strings[RPC_DISPLAY_PORT]);
2248
2249 status = xs_tcp_finish_connecting(xprt, sock);
2250 trace_rpc_socket_connect(xprt, sock, status);
2251 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2252 xprt, -status, xprt_connected(xprt),
2253 sock->sk->sk_state);
2254 switch (status) {
2255 default:
2256 printk("%s: connect returned unhandled error %d\n",
2257 __func__, status);
2258 fallthrough;
2259 case -EADDRNOTAVAIL:
2260 /* We're probably in TIME_WAIT. Get rid of existing socket,
2261 * and retry
2262 */
2263 xs_tcp_force_close(xprt);
2264 break;
2265 case 0:
2266 case -EINPROGRESS:
2267 case -EALREADY:
2268 xprt_unlock_connect(xprt, transport);
2269 return;
2270 case -EINVAL:
2271 /* Happens, for instance, if the user specified a link
2272 * local IPv6 address without a scope-id.
2273 */
2274 case -ECONNREFUSED:
2275 case -ECONNRESET:
2276 case -ENETDOWN:
2277 case -ENETUNREACH:
2278 case -EHOSTUNREACH:
2279 case -EADDRINUSE:
2280 case -ENOBUFS:
2281 /*
2282 * xs_tcp_force_close() wakes tasks with -EIO.
2283 * We need to wake them first to ensure the
2284 * correct error code.
2285 */
2286 xprt_wake_pending_tasks(xprt, status);
2287 xs_tcp_force_close(xprt);
2288 goto out;
2289 }
2290 status = -EAGAIN;
2291out:
2292 xprt_clear_connecting(xprt);
2293 xprt_unlock_connect(xprt, transport);
2294 xprt_wake_pending_tasks(xprt, status);
2295}
2296
2297/**
2298 * xs_connect - connect a socket to a remote endpoint
2299 * @xprt: pointer to transport structure
2300 * @task: address of RPC task that manages state of connect request
2301 *
2302 * TCP: If the remote end dropped the connection, delay reconnecting.
2303 *
2304 * UDP socket connects are synchronous, but we use a work queue anyway
2305 * to guarantee that even unprivileged user processes can set up a
2306 * socket on a privileged port.
2307 *
2308 * If a UDP socket connect fails, the delay behavior here prevents
2309 * retry floods (hard mounts).
2310 */
2311static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2312{
2313 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2314 unsigned long delay = 0;
2315
2316 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2317
2318 if (transport->sock != NULL) {
2319 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2320 "seconds\n",
2321 xprt, xprt->reestablish_timeout / HZ);
2322
2323 /* Start by resetting any existing state */
2324 xs_reset_transport(transport);
2325
2326 delay = xprt_reconnect_delay(xprt);
2327 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2328
2329 } else
2330 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2331
2332 queue_delayed_work(xprtiod_workqueue,
2333 &transport->connect_worker,
2334 delay);
2335}
2336
2337static void xs_wake_disconnect(struct sock_xprt *transport)
2338{
2339 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2340 xs_tcp_force_close(&transport->xprt);
2341}
2342
2343static void xs_wake_write(struct sock_xprt *transport)
2344{
2345 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2346 xprt_write_space(&transport->xprt);
2347}
2348
2349static void xs_wake_error(struct sock_xprt *transport)
2350{
2351 int sockerr;
2352
2353 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2354 return;
2355 mutex_lock(&transport->recv_mutex);
2356 if (transport->sock == NULL)
2357 goto out;
2358 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2359 goto out;
2360 sockerr = xchg(&transport->xprt_err, 0);
2361 if (sockerr < 0)
2362 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2363out:
2364 mutex_unlock(&transport->recv_mutex);
2365}
2366
2367static void xs_wake_pending(struct sock_xprt *transport)
2368{
2369 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2370 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2371}
2372
2373static void xs_error_handle(struct work_struct *work)
2374{
2375 struct sock_xprt *transport = container_of(work,
2376 struct sock_xprt, error_worker);
2377
2378 xs_wake_disconnect(transport);
2379 xs_wake_write(transport);
2380 xs_wake_error(transport);
2381 xs_wake_pending(transport);
2382}
2383
2384/**
2385 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2386 * @xprt: rpc_xprt struct containing statistics
2387 * @seq: output file
2388 *
2389 */
2390static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2391{
2392 long idle_time = 0;
2393
2394 if (xprt_connected(xprt))
2395 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2396
2397 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2398 "%llu %llu %lu %llu %llu\n",
2399 xprt->stat.bind_count,
2400 xprt->stat.connect_count,
2401 xprt->stat.connect_time / HZ,
2402 idle_time,
2403 xprt->stat.sends,
2404 xprt->stat.recvs,
2405 xprt->stat.bad_xids,
2406 xprt->stat.req_u,
2407 xprt->stat.bklog_u,
2408 xprt->stat.max_slots,
2409 xprt->stat.sending_u,
2410 xprt->stat.pending_u);
2411}
2412
2413/**
2414 * xs_udp_print_stats - display UDP socket-specifc stats
2415 * @xprt: rpc_xprt struct containing statistics
2416 * @seq: output file
2417 *
2418 */
2419static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2420{
2421 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2422
2423 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2424 "%lu %llu %llu\n",
2425 transport->srcport,
2426 xprt->stat.bind_count,
2427 xprt->stat.sends,
2428 xprt->stat.recvs,
2429 xprt->stat.bad_xids,
2430 xprt->stat.req_u,
2431 xprt->stat.bklog_u,
2432 xprt->stat.max_slots,
2433 xprt->stat.sending_u,
2434 xprt->stat.pending_u);
2435}
2436
2437/**
2438 * xs_tcp_print_stats - display TCP socket-specifc stats
2439 * @xprt: rpc_xprt struct containing statistics
2440 * @seq: output file
2441 *
2442 */
2443static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2444{
2445 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2446 long idle_time = 0;
2447
2448 if (xprt_connected(xprt))
2449 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2450
2451 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2452 "%llu %llu %lu %llu %llu\n",
2453 transport->srcport,
2454 xprt->stat.bind_count,
2455 xprt->stat.connect_count,
2456 xprt->stat.connect_time / HZ,
2457 idle_time,
2458 xprt->stat.sends,
2459 xprt->stat.recvs,
2460 xprt->stat.bad_xids,
2461 xprt->stat.req_u,
2462 xprt->stat.bklog_u,
2463 xprt->stat.max_slots,
2464 xprt->stat.sending_u,
2465 xprt->stat.pending_u);
2466}
2467
2468/*
2469 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2470 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2471 * to use the server side send routines.
2472 */
2473static int bc_malloc(struct rpc_task *task)
2474{
2475 struct rpc_rqst *rqst = task->tk_rqstp;
2476 size_t size = rqst->rq_callsize;
2477 struct page *page;
2478 struct rpc_buffer *buf;
2479
2480 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2481 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2482 size);
2483 return -EINVAL;
2484 }
2485
2486 page = alloc_page(GFP_KERNEL);
2487 if (!page)
2488 return -ENOMEM;
2489
2490 buf = page_address(page);
2491 buf->len = PAGE_SIZE;
2492
2493 rqst->rq_buffer = buf->data;
2494 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2495 return 0;
2496}
2497
2498/*
2499 * Free the space allocated in the bc_alloc routine
2500 */
2501static void bc_free(struct rpc_task *task)
2502{
2503 void *buffer = task->tk_rqstp->rq_buffer;
2504 struct rpc_buffer *buf;
2505
2506 buf = container_of(buffer, struct rpc_buffer, data);
2507 free_page((unsigned long)buf);
2508}
2509
2510static int bc_sendto(struct rpc_rqst *req)
2511{
2512 struct xdr_buf *xdr = &req->rq_snd_buf;
2513 struct sock_xprt *transport =
2514 container_of(req->rq_xprt, struct sock_xprt, xprt);
2515 struct msghdr msg = {
2516 .msg_flags = 0,
2517 };
2518 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2519 (u32)xdr->len);
2520 unsigned int sent = 0;
2521 int err;
2522
2523 req->rq_xtime = ktime_get();
2524 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2525 xdr_free_bvec(xdr);
2526 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2527 return -EAGAIN;
2528 return sent;
2529}
2530
2531/**
2532 * bc_send_request - Send a backchannel Call on a TCP socket
2533 * @req: rpc_rqst containing Call message to be sent
2534 *
2535 * xpt_mutex ensures @rqstp's whole message is written to the socket
2536 * without interruption.
2537 *
2538 * Return values:
2539 * %0 if the message was sent successfully
2540 * %ENOTCONN if the message was not sent
2541 */
2542static int bc_send_request(struct rpc_rqst *req)
2543{
2544 struct svc_xprt *xprt;
2545 int len;
2546
2547 /*
2548 * Get the server socket associated with this callback xprt
2549 */
2550 xprt = req->rq_xprt->bc_xprt;
2551
2552 /*
2553 * Grab the mutex to serialize data as the connection is shared
2554 * with the fore channel
2555 */
2556 mutex_lock(&xprt->xpt_mutex);
2557 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2558 len = -ENOTCONN;
2559 else
2560 len = bc_sendto(req);
2561 mutex_unlock(&xprt->xpt_mutex);
2562
2563 if (len > 0)
2564 len = 0;
2565
2566 return len;
2567}
2568
2569/*
2570 * The close routine. Since this is client initiated, we do nothing
2571 */
2572
2573static void bc_close(struct rpc_xprt *xprt)
2574{
2575 xprt_disconnect_done(xprt);
2576}
2577
2578/*
2579 * The xprt destroy routine. Again, because this connection is client
2580 * initiated, we do nothing
2581 */
2582
2583static void bc_destroy(struct rpc_xprt *xprt)
2584{
2585 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2586
2587 xs_xprt_free(xprt);
2588 module_put(THIS_MODULE);
2589}
2590
2591static const struct rpc_xprt_ops xs_local_ops = {
2592 .reserve_xprt = xprt_reserve_xprt,
2593 .release_xprt = xprt_release_xprt,
2594 .alloc_slot = xprt_alloc_slot,
2595 .free_slot = xprt_free_slot,
2596 .rpcbind = xs_local_rpcbind,
2597 .set_port = xs_local_set_port,
2598 .connect = xs_local_connect,
2599 .buf_alloc = rpc_malloc,
2600 .buf_free = rpc_free,
2601 .prepare_request = xs_stream_prepare_request,
2602 .send_request = xs_local_send_request,
2603 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2604 .close = xs_close,
2605 .destroy = xs_destroy,
2606 .print_stats = xs_local_print_stats,
2607 .enable_swap = xs_enable_swap,
2608 .disable_swap = xs_disable_swap,
2609};
2610
2611static const struct rpc_xprt_ops xs_udp_ops = {
2612 .set_buffer_size = xs_udp_set_buffer_size,
2613 .reserve_xprt = xprt_reserve_xprt_cong,
2614 .release_xprt = xprt_release_xprt_cong,
2615 .alloc_slot = xprt_alloc_slot,
2616 .free_slot = xprt_free_slot,
2617 .rpcbind = rpcb_getport_async,
2618 .set_port = xs_set_port,
2619 .connect = xs_connect,
2620 .buf_alloc = rpc_malloc,
2621 .buf_free = rpc_free,
2622 .send_request = xs_udp_send_request,
2623 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2624 .timer = xs_udp_timer,
2625 .release_request = xprt_release_rqst_cong,
2626 .close = xs_close,
2627 .destroy = xs_destroy,
2628 .print_stats = xs_udp_print_stats,
2629 .enable_swap = xs_enable_swap,
2630 .disable_swap = xs_disable_swap,
2631 .inject_disconnect = xs_inject_disconnect,
2632};
2633
2634static const struct rpc_xprt_ops xs_tcp_ops = {
2635 .reserve_xprt = xprt_reserve_xprt,
2636 .release_xprt = xprt_release_xprt,
2637 .alloc_slot = xprt_alloc_slot,
2638 .free_slot = xprt_free_slot,
2639 .rpcbind = rpcb_getport_async,
2640 .set_port = xs_set_port,
2641 .connect = xs_connect,
2642 .buf_alloc = rpc_malloc,
2643 .buf_free = rpc_free,
2644 .prepare_request = xs_stream_prepare_request,
2645 .send_request = xs_tcp_send_request,
2646 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2647 .close = xs_tcp_shutdown,
2648 .destroy = xs_destroy,
2649 .set_connect_timeout = xs_tcp_set_connect_timeout,
2650 .print_stats = xs_tcp_print_stats,
2651 .enable_swap = xs_enable_swap,
2652 .disable_swap = xs_disable_swap,
2653 .inject_disconnect = xs_inject_disconnect,
2654#ifdef CONFIG_SUNRPC_BACKCHANNEL
2655 .bc_setup = xprt_setup_bc,
2656 .bc_maxpayload = xs_tcp_bc_maxpayload,
2657 .bc_num_slots = xprt_bc_max_slots,
2658 .bc_free_rqst = xprt_free_bc_rqst,
2659 .bc_destroy = xprt_destroy_bc,
2660#endif
2661};
2662
2663/*
2664 * The rpc_xprt_ops for the server backchannel
2665 */
2666
2667static const struct rpc_xprt_ops bc_tcp_ops = {
2668 .reserve_xprt = xprt_reserve_xprt,
2669 .release_xprt = xprt_release_xprt,
2670 .alloc_slot = xprt_alloc_slot,
2671 .free_slot = xprt_free_slot,
2672 .buf_alloc = bc_malloc,
2673 .buf_free = bc_free,
2674 .send_request = bc_send_request,
2675 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2676 .close = bc_close,
2677 .destroy = bc_destroy,
2678 .print_stats = xs_tcp_print_stats,
2679 .enable_swap = xs_enable_swap,
2680 .disable_swap = xs_disable_swap,
2681 .inject_disconnect = xs_inject_disconnect,
2682};
2683
2684static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2685{
2686 static const struct sockaddr_in sin = {
2687 .sin_family = AF_INET,
2688 .sin_addr.s_addr = htonl(INADDR_ANY),
2689 };
2690 static const struct sockaddr_in6 sin6 = {
2691 .sin6_family = AF_INET6,
2692 .sin6_addr = IN6ADDR_ANY_INIT,
2693 };
2694
2695 switch (family) {
2696 case AF_LOCAL:
2697 break;
2698 case AF_INET:
2699 memcpy(sap, &sin, sizeof(sin));
2700 break;
2701 case AF_INET6:
2702 memcpy(sap, &sin6, sizeof(sin6));
2703 break;
2704 default:
2705 dprintk("RPC: %s: Bad address family\n", __func__);
2706 return -EAFNOSUPPORT;
2707 }
2708 return 0;
2709}
2710
2711static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2712 unsigned int slot_table_size,
2713 unsigned int max_slot_table_size)
2714{
2715 struct rpc_xprt *xprt;
2716 struct sock_xprt *new;
2717
2718 if (args->addrlen > sizeof(xprt->addr)) {
2719 dprintk("RPC: xs_setup_xprt: address too large\n");
2720 return ERR_PTR(-EBADF);
2721 }
2722
2723 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2724 max_slot_table_size);
2725 if (xprt == NULL) {
2726 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2727 "rpc_xprt\n");
2728 return ERR_PTR(-ENOMEM);
2729 }
2730
2731 new = container_of(xprt, struct sock_xprt, xprt);
2732 mutex_init(&new->recv_mutex);
2733 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2734 xprt->addrlen = args->addrlen;
2735 if (args->srcaddr)
2736 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2737 else {
2738 int err;
2739 err = xs_init_anyaddr(args->dstaddr->sa_family,
2740 (struct sockaddr *)&new->srcaddr);
2741 if (err != 0) {
2742 xprt_free(xprt);
2743 return ERR_PTR(err);
2744 }
2745 }
2746
2747 return xprt;
2748}
2749
2750static const struct rpc_timeout xs_local_default_timeout = {
2751 .to_initval = 10 * HZ,
2752 .to_maxval = 10 * HZ,
2753 .to_retries = 2,
2754};
2755
2756/**
2757 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2758 * @args: rpc transport creation arguments
2759 *
2760 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2761 */
2762static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2763{
2764 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2765 struct sock_xprt *transport;
2766 struct rpc_xprt *xprt;
2767 struct rpc_xprt *ret;
2768
2769 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2770 xprt_max_tcp_slot_table_entries);
2771 if (IS_ERR(xprt))
2772 return xprt;
2773 transport = container_of(xprt, struct sock_xprt, xprt);
2774
2775 xprt->prot = 0;
2776 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2777
2778 xprt->bind_timeout = XS_BIND_TO;
2779 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2780 xprt->idle_timeout = XS_IDLE_DISC_TO;
2781
2782 xprt->ops = &xs_local_ops;
2783 xprt->timeout = &xs_local_default_timeout;
2784
2785 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2786 INIT_WORK(&transport->error_worker, xs_error_handle);
2787 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2788
2789 switch (sun->sun_family) {
2790 case AF_LOCAL:
2791 if (sun->sun_path[0] != '/') {
2792 dprintk("RPC: bad AF_LOCAL address: %s\n",
2793 sun->sun_path);
2794 ret = ERR_PTR(-EINVAL);
2795 goto out_err;
2796 }
2797 xprt_set_bound(xprt);
2798 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2799 ret = ERR_PTR(xs_local_setup_socket(transport));
2800 if (ret)
2801 goto out_err;
2802 break;
2803 default:
2804 ret = ERR_PTR(-EAFNOSUPPORT);
2805 goto out_err;
2806 }
2807
2808 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2809 xprt->address_strings[RPC_DISPLAY_ADDR]);
2810
2811 if (try_module_get(THIS_MODULE))
2812 return xprt;
2813 ret = ERR_PTR(-EINVAL);
2814out_err:
2815 xs_xprt_free(xprt);
2816 return ret;
2817}
2818
2819static const struct rpc_timeout xs_udp_default_timeout = {
2820 .to_initval = 5 * HZ,
2821 .to_maxval = 30 * HZ,
2822 .to_increment = 5 * HZ,
2823 .to_retries = 5,
2824};
2825
2826/**
2827 * xs_setup_udp - Set up transport to use a UDP socket
2828 * @args: rpc transport creation arguments
2829 *
2830 */
2831static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2832{
2833 struct sockaddr *addr = args->dstaddr;
2834 struct rpc_xprt *xprt;
2835 struct sock_xprt *transport;
2836 struct rpc_xprt *ret;
2837
2838 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2839 xprt_udp_slot_table_entries);
2840 if (IS_ERR(xprt))
2841 return xprt;
2842 transport = container_of(xprt, struct sock_xprt, xprt);
2843
2844 xprt->prot = IPPROTO_UDP;
2845 /* XXX: header size can vary due to auth type, IPv6, etc. */
2846 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2847
2848 xprt->bind_timeout = XS_BIND_TO;
2849 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2850 xprt->idle_timeout = XS_IDLE_DISC_TO;
2851
2852 xprt->ops = &xs_udp_ops;
2853
2854 xprt->timeout = &xs_udp_default_timeout;
2855
2856 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2857 INIT_WORK(&transport->error_worker, xs_error_handle);
2858 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2859
2860 switch (addr->sa_family) {
2861 case AF_INET:
2862 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2863 xprt_set_bound(xprt);
2864
2865 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2866 break;
2867 case AF_INET6:
2868 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2869 xprt_set_bound(xprt);
2870
2871 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2872 break;
2873 default:
2874 ret = ERR_PTR(-EAFNOSUPPORT);
2875 goto out_err;
2876 }
2877
2878 if (xprt_bound(xprt))
2879 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2880 xprt->address_strings[RPC_DISPLAY_ADDR],
2881 xprt->address_strings[RPC_DISPLAY_PORT],
2882 xprt->address_strings[RPC_DISPLAY_PROTO]);
2883 else
2884 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2885 xprt->address_strings[RPC_DISPLAY_ADDR],
2886 xprt->address_strings[RPC_DISPLAY_PROTO]);
2887
2888 if (try_module_get(THIS_MODULE))
2889 return xprt;
2890 ret = ERR_PTR(-EINVAL);
2891out_err:
2892 xs_xprt_free(xprt);
2893 return ret;
2894}
2895
2896static const struct rpc_timeout xs_tcp_default_timeout = {
2897 .to_initval = 60 * HZ,
2898 .to_maxval = 60 * HZ,
2899 .to_retries = 2,
2900};
2901
2902/**
2903 * xs_setup_tcp - Set up transport to use a TCP socket
2904 * @args: rpc transport creation arguments
2905 *
2906 */
2907static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2908{
2909 struct sockaddr *addr = args->dstaddr;
2910 struct rpc_xprt *xprt;
2911 struct sock_xprt *transport;
2912 struct rpc_xprt *ret;
2913 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2914
2915 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2916 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2917
2918 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2919 max_slot_table_size);
2920 if (IS_ERR(xprt))
2921 return xprt;
2922 transport = container_of(xprt, struct sock_xprt, xprt);
2923
2924 xprt->prot = IPPROTO_TCP;
2925 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2926
2927 xprt->bind_timeout = XS_BIND_TO;
2928 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2929 xprt->idle_timeout = XS_IDLE_DISC_TO;
2930
2931 xprt->ops = &xs_tcp_ops;
2932 xprt->timeout = &xs_tcp_default_timeout;
2933
2934 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
2935 xprt->connect_timeout = xprt->timeout->to_initval *
2936 (xprt->timeout->to_retries + 1);
2937
2938 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2939 INIT_WORK(&transport->error_worker, xs_error_handle);
2940 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2941
2942 switch (addr->sa_family) {
2943 case AF_INET:
2944 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2945 xprt_set_bound(xprt);
2946
2947 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2948 break;
2949 case AF_INET6:
2950 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2951 xprt_set_bound(xprt);
2952
2953 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2954 break;
2955 default:
2956 ret = ERR_PTR(-EAFNOSUPPORT);
2957 goto out_err;
2958 }
2959
2960 if (xprt_bound(xprt))
2961 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2962 xprt->address_strings[RPC_DISPLAY_ADDR],
2963 xprt->address_strings[RPC_DISPLAY_PORT],
2964 xprt->address_strings[RPC_DISPLAY_PROTO]);
2965 else
2966 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2967 xprt->address_strings[RPC_DISPLAY_ADDR],
2968 xprt->address_strings[RPC_DISPLAY_PROTO]);
2969
2970 if (try_module_get(THIS_MODULE))
2971 return xprt;
2972 ret = ERR_PTR(-EINVAL);
2973out_err:
2974 xs_xprt_free(xprt);
2975 return ret;
2976}
2977
2978/**
2979 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2980 * @args: rpc transport creation arguments
2981 *
2982 */
2983static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2984{
2985 struct sockaddr *addr = args->dstaddr;
2986 struct rpc_xprt *xprt;
2987 struct sock_xprt *transport;
2988 struct svc_sock *bc_sock;
2989 struct rpc_xprt *ret;
2990
2991 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2992 xprt_tcp_slot_table_entries);
2993 if (IS_ERR(xprt))
2994 return xprt;
2995 transport = container_of(xprt, struct sock_xprt, xprt);
2996
2997 xprt->prot = IPPROTO_TCP;
2998 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2999 xprt->timeout = &xs_tcp_default_timeout;
3000
3001 /* backchannel */
3002 xprt_set_bound(xprt);
3003 xprt->bind_timeout = 0;
3004 xprt->reestablish_timeout = 0;
3005 xprt->idle_timeout = 0;
3006
3007 xprt->ops = &bc_tcp_ops;
3008
3009 switch (addr->sa_family) {
3010 case AF_INET:
3011 xs_format_peer_addresses(xprt, "tcp",
3012 RPCBIND_NETID_TCP);
3013 break;
3014 case AF_INET6:
3015 xs_format_peer_addresses(xprt, "tcp",
3016 RPCBIND_NETID_TCP6);
3017 break;
3018 default:
3019 ret = ERR_PTR(-EAFNOSUPPORT);
3020 goto out_err;
3021 }
3022
3023 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3024 xprt->address_strings[RPC_DISPLAY_ADDR],
3025 xprt->address_strings[RPC_DISPLAY_PORT],
3026 xprt->address_strings[RPC_DISPLAY_PROTO]);
3027
3028 /*
3029 * Once we've associated a backchannel xprt with a connection,
3030 * we want to keep it around as long as the connection lasts,
3031 * in case we need to start using it for a backchannel again;
3032 * this reference won't be dropped until bc_xprt is destroyed.
3033 */
3034 xprt_get(xprt);
3035 args->bc_xprt->xpt_bc_xprt = xprt;
3036 xprt->bc_xprt = args->bc_xprt;
3037 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3038 transport->sock = bc_sock->sk_sock;
3039 transport->inet = bc_sock->sk_sk;
3040
3041 /*
3042 * Since we don't want connections for the backchannel, we set
3043 * the xprt status to connected
3044 */
3045 xprt_set_connected(xprt);
3046
3047 if (try_module_get(THIS_MODULE))
3048 return xprt;
3049
3050 args->bc_xprt->xpt_bc_xprt = NULL;
3051 args->bc_xprt->xpt_bc_xps = NULL;
3052 xprt_put(xprt);
3053 ret = ERR_PTR(-EINVAL);
3054out_err:
3055 xs_xprt_free(xprt);
3056 return ret;
3057}
3058
3059static struct xprt_class xs_local_transport = {
3060 .list = LIST_HEAD_INIT(xs_local_transport.list),
3061 .name = "named UNIX socket",
3062 .owner = THIS_MODULE,
3063 .ident = XPRT_TRANSPORT_LOCAL,
3064 .setup = xs_setup_local,
3065};
3066
3067static struct xprt_class xs_udp_transport = {
3068 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3069 .name = "udp",
3070 .owner = THIS_MODULE,
3071 .ident = XPRT_TRANSPORT_UDP,
3072 .setup = xs_setup_udp,
3073};
3074
3075static struct xprt_class xs_tcp_transport = {
3076 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3077 .name = "tcp",
3078 .owner = THIS_MODULE,
3079 .ident = XPRT_TRANSPORT_TCP,
3080 .setup = xs_setup_tcp,
3081};
3082
3083static struct xprt_class xs_bc_tcp_transport = {
3084 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3085 .name = "tcp NFSv4.1 backchannel",
3086 .owner = THIS_MODULE,
3087 .ident = XPRT_TRANSPORT_BC_TCP,
3088 .setup = xs_setup_bc_tcp,
3089};
3090
3091/**
3092 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3093 *
3094 */
3095int init_socket_xprt(void)
3096{
3097 if (!sunrpc_table_header)
3098 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3099
3100 xprt_register_transport(&xs_local_transport);
3101 xprt_register_transport(&xs_udp_transport);
3102 xprt_register_transport(&xs_tcp_transport);
3103 xprt_register_transport(&xs_bc_tcp_transport);
3104
3105 return 0;
3106}
3107
3108/**
3109 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3110 *
3111 */
3112void cleanup_socket_xprt(void)
3113{
3114 if (sunrpc_table_header) {
3115 unregister_sysctl_table(sunrpc_table_header);
3116 sunrpc_table_header = NULL;
3117 }
3118
3119 xprt_unregister_transport(&xs_local_transport);
3120 xprt_unregister_transport(&xs_udp_transport);
3121 xprt_unregister_transport(&xs_tcp_transport);
3122 xprt_unregister_transport(&xs_bc_tcp_transport);
3123}
3124
3125static int param_set_uint_minmax(const char *val,
3126 const struct kernel_param *kp,
3127 unsigned int min, unsigned int max)
3128{
3129 unsigned int num;
3130 int ret;
3131
3132 if (!val)
3133 return -EINVAL;
3134 ret = kstrtouint(val, 0, &num);
3135 if (ret)
3136 return ret;
3137 if (num < min || num > max)
3138 return -EINVAL;
3139 *((unsigned int *)kp->arg) = num;
3140 return 0;
3141}
3142
3143static int param_set_portnr(const char *val, const struct kernel_param *kp)
3144{
3145 return param_set_uint_minmax(val, kp,
3146 RPC_MIN_RESVPORT,
3147 RPC_MAX_RESVPORT);
3148}
3149
3150static const struct kernel_param_ops param_ops_portnr = {
3151 .set = param_set_portnr,
3152 .get = param_get_uint,
3153};
3154
3155#define param_check_portnr(name, p) \
3156 __param_check(name, p, unsigned int);
3157
3158module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3159module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3160
3161static int param_set_slot_table_size(const char *val,
3162 const struct kernel_param *kp)
3163{
3164 return param_set_uint_minmax(val, kp,
3165 RPC_MIN_SLOT_TABLE,
3166 RPC_MAX_SLOT_TABLE);
3167}
3168
3169static const struct kernel_param_ops param_ops_slot_table_size = {
3170 .set = param_set_slot_table_size,
3171 .get = param_get_uint,
3172};
3173
3174#define param_check_slot_table_size(name, p) \
3175 __param_check(name, p, unsigned int);
3176
3177static int param_set_max_slot_table_size(const char *val,
3178 const struct kernel_param *kp)
3179{
3180 return param_set_uint_minmax(val, kp,
3181 RPC_MIN_SLOT_TABLE,
3182 RPC_MAX_SLOT_TABLE_LIMIT);
3183}
3184
3185static const struct kernel_param_ops param_ops_max_slot_table_size = {
3186 .set = param_set_max_slot_table_size,
3187 .get = param_get_uint,
3188};
3189
3190#define param_check_max_slot_table_size(name, p) \
3191 __param_check(name, p, unsigned int);
3192
3193module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3194 slot_table_size, 0644);
3195module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3196 max_slot_table_size, 0644);
3197module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3198 slot_table_size, 0644);
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
64static void xs_close(struct rpc_xprt *xprt);
65static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
66static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
67 struct socket *sock);
68
69/*
70 * xprtsock tunables
71 */
72static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
73static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
74static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
75
76static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
77static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
78
79#define XS_TCP_LINGER_TO (15U * HZ)
80static 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
91static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
92static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
93static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
94static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
95static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
96
97static struct ctl_table_header *sunrpc_table_header;
98
99static struct xprt_class xs_local_transport;
100static struct xprt_class xs_udp_transport;
101static struct xprt_class xs_tcp_transport;
102static struct xprt_class xs_tcp_tls_transport;
103static 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 */
109static 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
205static 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
223static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
224{
225 /* NOP */
226}
227#endif
228
229static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
230{
231 return (struct rpc_xprt *) sk->sk_user_data;
232}
233
234static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
235{
236 return (struct sockaddr *) &xprt->addr;
237}
238
239static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_un *) &xprt->addr;
242}
243
244static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
245{
246 return (struct sockaddr_in *) &xprt->addr;
247}
248
249static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
250{
251 return (struct sockaddr_in6 *) &xprt->addr;
252}
253
254static 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(buf, sun->sun_path, sizeof(buf));
267 } else {
268 buf[0] = '@';
269 strscpy(buf+1, sun->sun_path+1, sizeof(buf)-1);
270 }
271 xprt->address_strings[RPC_DISPLAY_ADDR] =
272 kstrdup(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(buf, GFP_KERNEL);
278 sin = xs_addr_in(xprt);
279 snprintf(buf, sizeof(buf), "%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(buf, GFP_KERNEL);
285 sin6 = xs_addr_in6(xprt);
286 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
287 break;
288 default:
289 BUG();
290 }
291
292 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
293}
294
295static 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, sizeof(buf), "%u", rpc_get_port(sap));
301 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
302
303 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
304 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
305}
306
307static 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
317static void xs_update_peer_port(struct rpc_xprt *xprt)
318{
319 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
320 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
321
322 xs_format_common_peer_ports(xprt);
323}
324
325static 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(xprt->address_strings[i]);
336 }
337}
338
339static size_t
340xs_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
359static int
360xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
361 struct cmsghdr *cmsg, int ret)
362{
363 u8 content_type = tls_get_record_type(sock->sk, 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(sock->sk, msg, &level, &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
388static int
389xs_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, &u.cmsg, ret);
402 return ret;
403}
404
405static ssize_t
406xs_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(&msg->msg_iter, seek);
411 ret = xs_sock_recv_cmsg(sock, msg, flags);
412 return ret > 0 ? ret + seek : ret;
413}
414
415static ssize_t
416xs_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(&msg->msg_iter, ITER_DEST, kvec, 1, count);
420 return xs_sock_recvmsg(sock, msg, flags, seek);
421}
422
423static ssize_t
424xs_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(&msg->msg_iter, ITER_DEST, bvec, nr, count);
429 return xs_sock_recvmsg(sock, msg, flags, seek);
430}
431
432static ssize_t
433xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
434 size_t count)
435{
436 iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
437 return xs_sock_recv_cmsg(sock, msg, flags);
438}
439
440#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
441static void
442xs_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
454static inline void
455xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
456{
457}
458#endif
459
460static ssize_t
461xs_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, &buf->head[0], 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, buf->bvec,
488 xdr_buf_pagecount(buf),
489 want + buf->page_base,
490 seek + buf->page_base);
491 if (ret <= 0)
492 goto sock_err;
493 xs_flush_bvec(buf->bvec, ret, 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, &buf->tail[0], 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;
519out:
520 *read = offset - seek_init;
521 return ret;
522sock_err:
523 offset += seek;
524 goto out;
525}
526
527static void
528xs_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
539static bool
540xs_read_stream_request_done(struct sock_xprt *transport)
541{
542 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
543}
544
545static void
546xs_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
553static ssize_t
554xs_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(transport->sock, msg, flags, buf,
566 transport->recv.copied + want,
567 transport->recv.copied,
568 &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
592static size_t
593xs_read_stream_headersize(bool isfrag)
594{
595 if (isfrag)
596 return sizeof(__be32);
597 return 3 * sizeof(__be32);
598}
599
600static ssize_t
601xs_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(transport->sock, msg, flags, &kvec, want, seek);
609}
610
611#if defined(CONFIG_SUNRPC_BACKCHANNEL)
612static ssize_t
613xs_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, 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, transport->recv.copied);
635 else
636 req->rq_private_buf.len = transport->recv.copied;
637
638 return ret;
639}
640#else /* CONFIG_SUNRPC_BACKCHANNEL */
641static ssize_t
642xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
643{
644 return -ESHUTDOWN;
645}
646#endif /* CONFIG_SUNRPC_BACKCHANNEL */
647
648static ssize_t
649xs_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(&xprt->queue_lock);
657 req = xprt_lookup_rqst(xprt, 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(&xprt->queue_lock);
664
665 ret = xs_read_stream_request(transport, msg, flags, req);
666
667 spin_lock(&xprt->queue_lock);
668 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
669 xprt_complete_rqst(req->rq_task, transport->recv.copied);
670 else
671 req->rq_private_buf.len = transport->recv.copied;
672 xprt_unpin_rqst(req);
673out:
674 spin_unlock(&xprt->queue_lock);
675 return ret;
676}
677
678static ssize_t
679xs_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(transport->recv.copied != 0);
687 ret = xs_read_stream_header(transport, &msg, flags, want,
688 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, flags);
706 break;
707 case RPC_REPLY:
708 ret = xs_read_stream_reply(transport, &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(transport->sock, &msg, flags,
722 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(transport);
732 transport->recv.copied = 0;
733 }
734 transport->recv.offset = 0;
735 transport->recv.len = 0;
736 return read;
737out_err:
738 return ret != 0 ? ret : -ESHUTDOWN;
739}
740
741static __poll_t xs_poll_socket(struct sock_xprt *transport)
742{
743 return transport->sock->ops->poll(transport->file, transport->sock,
744 NULL);
745}
746
747static 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
754static void xs_poll_check_readable(struct sock_xprt *transport)
755{
756
757 clear_bit(XPRT_SOCK_DATA_READY, &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, &transport->sock_state))
763 queue_work(xprtiod_workqueue, &transport->recv_worker);
764}
765
766static 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(transport->sock, SHUT_RDWR);
783 else if (ret == -EACCES)
784 xprt_wake_pending_tasks(&transport->xprt, -EACCES);
785 else
786 xs_poll_check_readable(transport);
787out:
788 mutex_unlock(&transport->recv_mutex);
789 trace_xs_stream_read_data(&transport->xprt, ret, read);
790}
791
792static 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(pflags);
800}
801
802static void
803xs_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
811static void
812xs_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 */
826static 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(req, transport);
833
834 /* Protect against races with write_space */
835 spin_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, &transport->sock_state);
841 set_bit(SOCK_NOSPACE, &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(&xprt->transport_lock);
848 return ret;
849}
850
851static 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
865static 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
881static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
882{
883 return xdr_alloc_bvec(buf, 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 */
890static bool
891xs_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 */
899static rpc_fraghdr
900xs_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 */
918static 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("packet data:",
940 req->rq_svec->iov_base, req->rq_svec->iov_len);
941
942 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
943
944 req->rq_xtime = ktime_get();
945 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
946 transport->xmit.offset, rm, &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 */
989static 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("packet data:",
1003 req->rq_svec->iov_base,
1004 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(xdr, rpc_task_gfp_mask());
1013 if (status < 0)
1014 return status;
1015 req->rq_xtime = ktime_get();
1016 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &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(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
1036process_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 */
1075static 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(transport->sock, SHUT_RDWR);
1093 return -ENOTCONN;
1094 }
1095 if (!transport->inet)
1096 return -ENOTCONN;
1097
1098 xs_pktdump("packet data:",
1099 req->rq_svec->iov_base,
1100 req->rq_svec->iov_len);
1101
1102 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1103 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1104
1105 xs_set_srcport(transport, 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(transport->inet, true);
1112
1113 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1114
1115 do {
1116 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1117 transport->xmit.offset, rm, &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(&xprt->xmit_queuelen) == 1)
1130 tcp_sock_set_cork(transport->inet, 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
1164static 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
1172static 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
1180static 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, &transport->sock_state);
1186 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1187 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1188 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1189 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1190}
1191
1192static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1193{
1194 set_bit(nr, &transport->sock_state);
1195 queue_work(xprtiod_workqueue, &transport->error_worker);
1196}
1197
1198static 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, &xprt->state);
1203 clear_bit(XPRT_CLOSING, &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 */
1215static 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, sk->sk_socket, 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
1236static 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, &xprt->state);
1253 return;
1254 }
1255
1256 if (atomic_read(&transport->xprt.swapper))
1257 sk_clear_memalloc(sk);
1258
1259 tls_handshake_cancel(sk);
1260
1261 kernel_sock_shutdown(sock, 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(&transport->recv_mutex);
1278
1279 trace_rpc_socket_close(xprt, 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 */
1295static 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(transport->sock);
1303 xs_reset_transport(transport);
1304 xprt->reestablish_timeout = 0;
1305}
1306
1307static 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
1314static 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 */
1325static 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(&transport->connect_worker);
1332 xs_close(xprt);
1333 cancel_work_sync(&transport->recv_worker);
1334 cancel_work_sync(&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 */
1346static 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, 0, sizeof(_xid), &_xid);
1364 if (xp == NULL)
1365 return;
1366
1367 /* Look up and lock the request corresponding to the given XID */
1368 spin_lock(&xprt->queue_lock);
1369 rovr = xprt_lookup_rqst(xprt, *xp);
1370 if (!rovr)
1371 goto out_unlock;
1372 xprt_pin_rqst(rovr);
1373 xprt_update_rtt(rovr->rq_task);
1374 spin_unlock(&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(&rovr->rq_private_buf, skb)) {
1382 spin_lock(&xprt->queue_lock);
1383 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1384 goto out_unpin;
1385 }
1386
1387
1388 spin_lock(&xprt->transport_lock);
1389 xprt_adjust_cwnd(xprt, task, copied);
1390 spin_unlock(&xprt->transport_lock);
1391 spin_lock(&xprt->queue_lock);
1392 xprt_complete_rqst(task, copied);
1393 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1394out_unpin:
1395 xprt_unpin_rqst(rovr);
1396 out_unlock:
1397 spin_unlock(&xprt->queue_lock);
1398}
1399
1400static 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);
1412 if (skb == NULL)
1413 break;
1414 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1415 consume_skb(skb);
1416 cond_resched();
1417 }
1418 xs_poll_check_readable(transport);
1419out:
1420 mutex_unlock(&transport->recv_mutex);
1421}
1422
1423static 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(pflags);
1431}
1432
1433/**
1434 * xs_data_ready - "data ready" callback for sockets
1435 * @sk: socket with data to read
1436 *
1437 */
1438static 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, &transport->sock_state))
1462 queue_work(xprtiod_workqueue, &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 */
1470static void xs_tcp_force_close(struct rpc_xprt *xprt)
1471{
1472 xprt_force_disconnect(xprt);
1473}
1474
1475#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1476static 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 */
1487static 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, &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 */
1507static 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, 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, &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, &xprt->state);
1541 smp_mb__before_atomic();
1542 clear_bit(XPRT_CONNECTED, &xprt->state);
1543 clear_bit(XPRT_CLOSE_WAIT, &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, &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, &xprt->state);
1562 smp_mb__before_atomic();
1563 clear_bit(XPRT_CONNECTED, &xprt->state);
1564 smp_mb__after_atomic();
1565 break;
1566 case TCP_CLOSE:
1567 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1568 &transport->sock_state))
1569 xprt_clear_connecting(xprt);
1570 clear_bit(XPRT_CLOSING, &xprt->state);
1571 /* Trigger the socket release */
1572 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1573 }
1574}
1575
1576static 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, &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, &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 */
1604static 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 */
1621static 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
1628static 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 */
1652static 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 */
1673static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1674{
1675 spin_lock(&xprt->transport_lock);
1676 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1677 spin_unlock(&xprt->transport_lock);
1678}
1679
1680static 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(range);
1690 return rand + min;
1691}
1692
1693static 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, (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 }
1707out:
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 */
1717static 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(xs_addr(xprt), port);
1722 xs_update_peer_port(xprt);
1723}
1724
1725static 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
1731static 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
1740static 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);
1747 mutex_unlock(&sock->recv_mutex);
1748 return ret;
1749}
1750
1751static 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, &saddr.sa);
1763 if (ret >= 0)
1764 ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1765 }
1766 mutex_unlock(&sock->recv_mutex);
1767 return ret;
1768}
1769
1770static 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}
1780static 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((struct sockaddr *)&myaddr, port);
1808 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1809 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 */
1835static void xs_local_rpcbind(struct rpc_task *task)
1836{
1837 xprt_set_bound(task->tk_xprt);
1838}
1839
1840static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1841{
1842}
1843
1844#ifdef CONFIG_DEBUG_LOCK_ALLOC
1845static struct lock_class_key xs_key[3];
1846static struct lock_class_key xs_slock_key[3];
1847
1848static 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
1856static 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
1864static 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
1872static 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
1890static inline void xs_reclassify_socket(int family, struct socket *sock)
1891{
1892}
1893#endif
1894
1895static void xs_dummy_setup_socket(struct work_struct *work)
1896{
1897}
1898
1899static 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(xprt->xprt_net, family, type, protocol, &sock, 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(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(filp))
1926 return ERR_CAST(filp);
1927 transport->file = filp;
1928
1929 return sock;
1930out:
1931 return ERR_PTR(err);
1932}
1933
1934static 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, xs_addr(xprt), xprt->addrlen, 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 */
1972static 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(xprt->xprt_net, AF_LOCAL,
1980 SOCK_STREAM, 0, &sock, 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(filp)) {
1990 status = PTR_ERR(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, sock, 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
2025out:
2026 xprt_clear_connecting(xprt);
2027 xprt_wake_pending_tasks(xprt, status);
2028 return status;
2029}
2030
2031static 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, -ENOTCONN);
2050 goto out_wake;
2051 }
2052 ret = xs_local_setup_socket(transport);
2053 if (ret && !RPC_IS_SOFTCONN(task))
2054 msleep_interruptible(15000);
2055 return;
2056force_disconnect:
2057 xprt_force_disconnect(xprt);
2058out_wake:
2059 xprt_clear_connecting(xprt);
2060 xprt_wake_pending_tasks(xprt, -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 */
2069static 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(&xprt->swapper))
2081 sk_set_memalloc(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 */
2091static int
2092xs_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(&xprt->swapper) == 1 &&
2098 xs->inet)
2099 sk_set_memalloc(xs->inet);
2100 mutex_unlock(&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 */
2111static void
2112xs_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(&xprt->swapper) &&
2118 xs->inet)
2119 sk_clear_memalloc(xs->inet);
2120 mutex_unlock(&xs->recv_mutex);
2121}
2122#else
2123static void xs_set_memalloc(struct rpc_xprt *xprt)
2124{
2125}
2126
2127static int
2128xs_enable_swap(struct rpc_xprt *xprt)
2129{
2130 return -EINVAL;
2131}
2132
2133static void
2134xs_disable_swap(struct rpc_xprt *xprt)
2135{
2136}
2137#endif
2138
2139static 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
2170static 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(&xprt->swapper))
2180 current->flags |= PF_MEMALLOC;
2181 sock = xs_create_sock(xprt, transport,
2182 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2183 IPPROTO_UDP, false);
2184 if (IS_ERR(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, sock, 0);
2195 status = 0;
2196out:
2197 xprt_clear_connecting(xprt);
2198 xprt_unlock_connect(xprt, transport);
2199 xprt_wake_pending_tasks(xprt, status);
2200 current_restore_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 */
2210static 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, SHUT_RDWR);
2230 trace_rpc_socket_shutdown(xprt, sock);
2231 break;
2232 default:
2233 xs_reset_transport(transport);
2234 }
2235}
2236
2237static 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(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(&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(xprt->timeout->to_initval) *
2253 (xprt->timeout->to_retries + 1);
2254 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2255 spin_unlock(&xprt->transport_lock);
2256
2257 /* TCP Keepalive options */
2258 sock_set_keepalive(sock->sk);
2259 tcp_sock_set_keepidle(sock->sk, keepidle);
2260 tcp_sock_set_keepintvl(sock->sk, keepidle);
2261 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2262
2263 /* TCP user timeout (see RFC5482) */
2264 tcp_sock_set_user_timeout(sock->sk, 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(sock->sk, t - 1);
2275}
2276
2277static 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
2296static 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(&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, &transport->sock_state);
2308 spin_unlock(&xprt->transport_lock);
2309}
2310
2311static 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, 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, &transport->sock_state);
2365 return kernel_connect(sock, xs_addr(xprt), 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 */
2374static 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(&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 &transport->sock_state) ||
2390 !sock) {
2391 xs_reset_transport(transport);
2392 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2393 SOCK_STREAM, IPPROTO_TCP, true);
2394 if (IS_ERR(sock)) {
2395 xprt_wake_pending_tasks(xprt, PTR_ERR(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, sock, 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, &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);
2449out:
2450 xprt_clear_connecting(xprt);
2451out_unlock:
2452 xprt_unlock_connect(xprt, transport);
2453 current_restore_flags(pflags, PF_MEMALLOC);
2454}
2455
2456/*
2457 * Transfer the connected socket to @upper_transport, then mark that
2458 * xprt CONNECTED.
2459 */
2460static 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(upper_xprt)->sa_family == PF_INET6)
2479 ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2480
2481 xs_tcp_set_socket_timeouts(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, SOCK_LINGER);
2497
2498 xprt_clear_connected(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(lower_xprt);
2513 xs_sock_reset_connection_flags(lower_xprt);
2514 xs_stream_reset_connect(lower_transport);
2515 mutex_unlock(&lower_transport->recv_mutex);
2516 }
2517
2518 if (!xprt_bound(upper_xprt))
2519 return -ENOTCONN;
2520
2521 xs_set_memalloc(upper_xprt);
2522
2523 if (!xprt_test_and_set_connected(upper_xprt)) {
2524 upper_xprt->connect_cookie++;
2525 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2526 xprt_clear_connecting(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(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 */
2543static 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(lower_xprt);
2552}
2553
2554static 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(lower_xprt),
2562 .ta_peername = lower_xprt->servername,
2563 };
2564 struct sock *sk = lower_transport->inet;
2565 int rc;
2566
2567 init_completion(&lower_transport->handshake_done);
2568 set_bit(XPRT_SOCK_IGNORE_RECV, &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, 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, 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(&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
2600out:
2601 xs_stream_reset_connect(lower_transport);
2602 clear_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2603 return rc;
2604
2605out_put_xprt:
2606 xprt_put(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 */
2627static 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(&upper_xprt->swapper))
2655 current->flags |= PF_MEMALLOC;
2656
2657 xs_stream_start_connect(upper_transport);
2658
2659 /* This implicitly sends an RPC_AUTH_TLS probe */
2660 lower_clnt = rpc_create(&args);
2661 if (IS_ERR(lower_clnt)) {
2662 trace_rpc_tls_unavailable(upper_clnt, upper_xprt);
2663 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2664 xprt_clear_connecting(upper_xprt);
2665 xprt_wake_pending_tasks(upper_xprt, PTR_ERR(lower_clnt));
2666 xs_run_error_worker(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(&lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2678 goto out_unlock;
2679
2680 status = xs_tls_handshake_sync(lower_xprt, &upper_xprt->xprtsec);
2681 if (status) {
2682 trace_rpc_tls_not_started(upper_clnt, 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(upper_xprt, upper_transport->sock, 0);
2692 if (!xprt_test_and_set_connected(upper_xprt)) {
2693 upper_xprt->connect_cookie++;
2694 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2695 xprt_clear_connecting(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(upper_transport, XPRT_SOCK_WAKE_PENDING);
2701 }
2702 rpc_shutdown_client(lower_clnt);
2703
2704out_unlock:
2705 current_restore_flags(pflags, PF_MEMALLOC);
2706 upper_transport->clnt = NULL;
2707 xprt_unlock_connect(upper_xprt, upper_transport);
2708 return;
2709
2710out_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(upper_xprt, status);
2718 xs_tcp_force_close(upper_xprt);
2719 xprt_clear_connecting(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 */
2737static 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(xprtiod_workqueue,
2756 &transport->connect_worker,
2757 delay);
2758}
2759
2760static void xs_wake_disconnect(struct sock_xprt *transport)
2761{
2762 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2763 xs_tcp_force_close(&transport->xprt);
2764}
2765
2766static void xs_wake_write(struct sock_xprt *transport)
2767{
2768 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2769 xprt_write_space(&transport->xprt);
2770}
2771
2772static void xs_wake_error(struct sock_xprt *transport)
2773{
2774 int sockerr;
2775
2776 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2777 return;
2778 sockerr = xchg(&transport->xprt_err, 0);
2779 if (sockerr < 0) {
2780 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2781 xs_tcp_force_close(&transport->xprt);
2782 }
2783}
2784
2785static void xs_wake_pending(struct sock_xprt *transport)
2786{
2787 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2788 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2789}
2790
2791static 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 */
2808static 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(seq, "\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 */
2837static 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(seq, "\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 */
2861static 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(seq, "\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 */
2891static 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 */
2919static 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
2928static 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(xdr, rpc_task_gfp_mask());
2943 if (err < 0)
2944 return err;
2945 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2946 xdr_free_bvec(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 */
2963static 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(&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
2994static 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
3004static 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
3012static 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
3032static 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
3057static 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
3092static 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
3109static 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
3136static 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(-EBADF);
3146 }
3147
3148 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
3149 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(-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(args->dstaddr->sa_family,
3165 (struct sockaddr *)&new->srcaddr);
3166 if (err != 0) {
3167 xprt_free(xprt);
3168 return ERR_PTR(err);
3169 }
3170 }
3171
3172 return xprt;
3173}
3174
3175static 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 */
3187static 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, xprt_tcp_slot_table_entries,
3195 xprt_max_tcp_slot_table_entries);
3196 if (IS_ERR(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(-EINVAL);
3221 goto out_err;
3222 }
3223 xprt_set_bound(xprt);
3224 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
3225 break;
3226 default:
3227 ret = ERR_PTR(-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(-EINVAL);
3237out_err:
3238 xs_xprt_free(xprt);
3239 return ret;
3240}
3241
3242static 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 */
3254static 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, xprt_udp_slot_table_entries,
3262 xprt_udp_slot_table_entries);
3263 if (IS_ERR(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, "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, "udp", RPCBIND_NETID_UDP6);
3296 break;
3297 default:
3298 ret = ERR_PTR(-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(-EINVAL);
3315out_err:
3316 xs_xprt_free(xprt);
3317 return ret;
3318}
3319
3320static 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 */
3331static 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, xprt_tcp_slot_table_entries,
3343 max_slot_table_size);
3344 if (IS_ERR(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, 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, "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, "tcp", RPCBIND_NETID_TCP6);
3384 break;
3385 default:
3386 ret = ERR_PTR(-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(-EINVAL);
3403out_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 */
3413static 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, xprt_tcp_slot_table_entries,
3425 max_slot_table_size);
3426 if (IS_ERR(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(-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, "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, "tcp", RPCBIND_NETID_TCP6);
3472 break;
3473 default:
3474 ret = ERR_PTR(-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(-EINVAL);
3491out_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 */
3501static 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, xprt_tcp_slot_table_entries,
3510 xprt_tcp_slot_table_entries);
3511 if (IS_ERR(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, "tcp",
3531 RPCBIND_NETID_TCP);
3532 break;
3533 case AF_INET6:
3534 xs_format_peer_addresses(xprt, "tcp",
3535 RPCBIND_NETID_TCP6);
3536 break;
3537 default:
3538 ret = ERR_PTR(-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(-EINVAL);
3573out_err:
3574 xs_xprt_free(xprt);
3575 return ret;
3576}
3577
3578static 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
3587static 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
3596static 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
3605static 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
3614static 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 */
3627int 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(&xs_local_transport);
3633 xprt_register_transport(&xs_udp_transport);
3634 xprt_register_transport(&xs_tcp_transport);
3635 xprt_register_transport(&xs_tcp_tls_transport);
3636 xprt_register_transport(&xs_bc_tcp_transport);
3637
3638 return 0;
3639}
3640
3641/**
3642 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3643 *
3644 */
3645void cleanup_socket_xprt(void)
3646{
3647 if (sunrpc_table_header) {
3648 unregister_sysctl_table(sunrpc_table_header);
3649 sunrpc_table_header = NULL;
3650 }
3651
3652 xprt_unregister_transport(&xs_local_transport);
3653 xprt_unregister_transport(&xs_udp_transport);
3654 xprt_unregister_transport(&xs_tcp_transport);
3655 xprt_unregister_transport(&xs_tcp_tls_transport);
3656 xprt_unregister_transport(&xs_bc_tcp_transport);
3657}
3658
3659static 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
3666static 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
3674module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3675module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3676
3677static 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
3685static 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
3693static 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
3701static 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
3709module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3710 slot_table_size, 0644);
3711module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3712 max_slot_table_size, 0644);
3713module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3714 slot_table_size, 0644);