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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-block.git] / net / sunrpc / xprtsock.c
... / ...
CommitLineData
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_reset_srcport(struct sock_xprt *transport);
66static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
67static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
68 struct socket *sock);
69
70/*
71 * xprtsock tunables
72 */
73static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
74static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
75static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
76
77static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
78static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
79
80#define XS_TCP_LINGER_TO (15U * HZ)
81static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
82
83/*
84 * We can register our own files under /proc/sys/sunrpc by
85 * calling register_sysctl() again. The files in that
86 * directory become the union of all files registered there.
87 *
88 * We simply need to make sure that we don't collide with
89 * someone else's file names!
90 */
91
92static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
93static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
94static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
95static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
96static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
97
98static struct ctl_table_header *sunrpc_table_header;
99
100static struct xprt_class xs_local_transport;
101static struct xprt_class xs_udp_transport;
102static struct xprt_class xs_tcp_transport;
103static struct xprt_class xs_tcp_tls_transport;
104static struct xprt_class xs_bc_tcp_transport;
105
106/*
107 * FIXME: changing the UDP slot table size should also resize the UDP
108 * socket buffers for existing UDP transports
109 */
110static struct ctl_table xs_tunables_table[] = {
111 {
112 .procname = "udp_slot_table_entries",
113 .data = &xprt_udp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_slot_table_size
119 },
120 {
121 .procname = "tcp_slot_table_entries",
122 .data = &xprt_tcp_slot_table_entries,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &min_slot_table_size,
127 .extra2 = &max_slot_table_size
128 },
129 {
130 .procname = "tcp_max_slot_table_entries",
131 .data = &xprt_max_tcp_slot_table_entries,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = &min_slot_table_size,
136 .extra2 = &max_tcp_slot_table_limit
137 },
138 {
139 .procname = "min_resvport",
140 .data = &xprt_min_resvport,
141 .maxlen = sizeof(unsigned int),
142 .mode = 0644,
143 .proc_handler = proc_dointvec_minmax,
144 .extra1 = &xprt_min_resvport_limit,
145 .extra2 = &xprt_max_resvport_limit
146 },
147 {
148 .procname = "max_resvport",
149 .data = &xprt_max_resvport,
150 .maxlen = sizeof(unsigned int),
151 .mode = 0644,
152 .proc_handler = proc_dointvec_minmax,
153 .extra1 = &xprt_min_resvport_limit,
154 .extra2 = &xprt_max_resvport_limit
155 },
156 {
157 .procname = "tcp_fin_timeout",
158 .data = &xs_tcp_fin_timeout,
159 .maxlen = sizeof(xs_tcp_fin_timeout),
160 .mode = 0644,
161 .proc_handler = proc_dointvec_jiffies,
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
886static void xs_stream_abort_send_request(struct rpc_rqst *req)
887{
888 struct rpc_xprt *xprt = req->rq_xprt;
889 struct sock_xprt *transport =
890 container_of(xprt, struct sock_xprt, xprt);
891
892 if (transport->xmit.offset != 0 &&
893 !test_bit(XPRT_CLOSE_WAIT, &xprt->state))
894 xprt_force_disconnect(xprt);
895}
896
897/*
898 * Determine if the previous message in the stream was aborted before it
899 * could complete transmission.
900 */
901static bool
902xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
903{
904 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
905}
906
907/*
908 * Return the stream record marker field for a record of length < 2^31-1
909 */
910static rpc_fraghdr
911xs_stream_record_marker(struct xdr_buf *xdr)
912{
913 if (!xdr->len)
914 return 0;
915 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
916}
917
918/**
919 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
920 * @req: pointer to RPC request
921 *
922 * Return values:
923 * 0: The request has been sent
924 * EAGAIN: The socket was blocked, please call again later to
925 * complete the request
926 * ENOTCONN: Caller needs to invoke connect logic then call again
927 * other: Some other error occurred, the request was not sent
928 */
929static int xs_local_send_request(struct rpc_rqst *req)
930{
931 struct rpc_xprt *xprt = req->rq_xprt;
932 struct sock_xprt *transport =
933 container_of(xprt, struct sock_xprt, xprt);
934 struct xdr_buf *xdr = &req->rq_snd_buf;
935 rpc_fraghdr rm = xs_stream_record_marker(xdr);
936 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
937 struct msghdr msg = {
938 .msg_flags = XS_SENDMSG_FLAGS,
939 };
940 bool vm_wait;
941 unsigned int sent;
942 int status;
943
944 /* Close the stream if the previous transmission was incomplete */
945 if (xs_send_request_was_aborted(transport, req)) {
946 xprt_force_disconnect(xprt);
947 return -ENOTCONN;
948 }
949
950 xs_pktdump("packet data:",
951 req->rq_svec->iov_base, req->rq_svec->iov_len);
952
953 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
954
955 req->rq_xtime = ktime_get();
956 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
957 transport->xmit.offset, rm, &sent);
958 dprintk("RPC: %s(%u) = %d\n",
959 __func__, xdr->len - transport->xmit.offset, status);
960
961 if (likely(sent > 0) || status == 0) {
962 transport->xmit.offset += sent;
963 req->rq_bytes_sent = transport->xmit.offset;
964 if (likely(req->rq_bytes_sent >= msglen)) {
965 req->rq_xmit_bytes_sent += transport->xmit.offset;
966 transport->xmit.offset = 0;
967 return 0;
968 }
969 status = -EAGAIN;
970 vm_wait = false;
971 }
972
973 switch (status) {
974 case -EAGAIN:
975 status = xs_stream_nospace(req, vm_wait);
976 break;
977 default:
978 dprintk("RPC: sendmsg returned unrecognized error %d\n",
979 -status);
980 fallthrough;
981 case -EPIPE:
982 xprt_force_disconnect(xprt);
983 status = -ENOTCONN;
984 }
985
986 return status;
987}
988
989/**
990 * xs_udp_send_request - write an RPC request to a UDP socket
991 * @req: pointer to RPC request
992 *
993 * Return values:
994 * 0: The request has been sent
995 * EAGAIN: The socket was blocked, please call again later to
996 * complete the request
997 * ENOTCONN: Caller needs to invoke connect logic then call again
998 * other: Some other error occurred, the request was not sent
999 */
1000static int xs_udp_send_request(struct rpc_rqst *req)
1001{
1002 struct rpc_xprt *xprt = req->rq_xprt;
1003 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1004 struct xdr_buf *xdr = &req->rq_snd_buf;
1005 struct msghdr msg = {
1006 .msg_name = xs_addr(xprt),
1007 .msg_namelen = xprt->addrlen,
1008 .msg_flags = XS_SENDMSG_FLAGS,
1009 };
1010 unsigned int sent;
1011 int status;
1012
1013 xs_pktdump("packet data:",
1014 req->rq_svec->iov_base,
1015 req->rq_svec->iov_len);
1016
1017 if (!xprt_bound(xprt))
1018 return -ENOTCONN;
1019
1020 if (!xprt_request_get_cong(xprt, req))
1021 return -EBADSLT;
1022
1023 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
1024 if (status < 0)
1025 return status;
1026 req->rq_xtime = ktime_get();
1027 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
1028
1029 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1030 xdr->len, status);
1031
1032 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
1033 if (status == -EPERM)
1034 goto process_status;
1035
1036 if (status == -EAGAIN && sock_writeable(transport->inet))
1037 status = -ENOBUFS;
1038
1039 if (sent > 0 || status == 0) {
1040 req->rq_xmit_bytes_sent += sent;
1041 if (sent >= req->rq_slen)
1042 return 0;
1043 /* Still some bytes left; set up for a retry later. */
1044 status = -EAGAIN;
1045 }
1046
1047process_status:
1048 switch (status) {
1049 case -ENOTSOCK:
1050 status = -ENOTCONN;
1051 /* Should we call xs_close() here? */
1052 break;
1053 case -EAGAIN:
1054 status = xs_sock_nospace(req);
1055 break;
1056 case -ENETUNREACH:
1057 case -ENOBUFS:
1058 case -EPIPE:
1059 case -ECONNREFUSED:
1060 case -EPERM:
1061 /* When the server has died, an ICMP port unreachable message
1062 * prompts ECONNREFUSED. */
1063 break;
1064 default:
1065 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1066 -status);
1067 }
1068
1069 return status;
1070}
1071
1072/**
1073 * xs_tcp_send_request - write an RPC request to a TCP socket
1074 * @req: pointer to RPC request
1075 *
1076 * Return values:
1077 * 0: The request has been sent
1078 * EAGAIN: The socket was blocked, please call again later to
1079 * complete the request
1080 * ENOTCONN: Caller needs to invoke connect logic then call again
1081 * other: Some other error occurred, the request was not sent
1082 *
1083 * XXX: In the case of soft timeouts, should we eventually give up
1084 * if sendmsg is not able to make progress?
1085 */
1086static int xs_tcp_send_request(struct rpc_rqst *req)
1087{
1088 struct rpc_xprt *xprt = req->rq_xprt;
1089 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1090 struct xdr_buf *xdr = &req->rq_snd_buf;
1091 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1092 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1093 struct msghdr msg = {
1094 .msg_flags = XS_SENDMSG_FLAGS,
1095 };
1096 bool vm_wait;
1097 unsigned int sent;
1098 int status;
1099
1100 /* Close the stream if the previous transmission was incomplete */
1101 if (xs_send_request_was_aborted(transport, req)) {
1102 if (transport->sock != NULL)
1103 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1104 return -ENOTCONN;
1105 }
1106 if (!transport->inet)
1107 return -ENOTCONN;
1108
1109 xs_pktdump("packet data:",
1110 req->rq_svec->iov_base,
1111 req->rq_svec->iov_len);
1112
1113 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1114 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1115
1116 xs_set_srcport(transport, transport->sock);
1117
1118 /* Continue transmitting the packet/record. We must be careful
1119 * to cope with writespace callbacks arriving _after_ we have
1120 * called sendmsg(). */
1121 req->rq_xtime = ktime_get();
1122 tcp_sock_set_cork(transport->inet, true);
1123
1124 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1125
1126 do {
1127 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1128 transport->xmit.offset, rm, &sent);
1129
1130 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1131 xdr->len - transport->xmit.offset, status);
1132
1133 /* If we've sent the entire packet, immediately
1134 * reset the count of bytes sent. */
1135 transport->xmit.offset += sent;
1136 req->rq_bytes_sent = transport->xmit.offset;
1137 if (likely(req->rq_bytes_sent >= msglen)) {
1138 req->rq_xmit_bytes_sent += transport->xmit.offset;
1139 transport->xmit.offset = 0;
1140 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1141 tcp_sock_set_cork(transport->inet, false);
1142 return 0;
1143 }
1144
1145 WARN_ON_ONCE(sent == 0 && status == 0);
1146
1147 if (sent > 0)
1148 vm_wait = false;
1149
1150 } while (status == 0);
1151
1152 switch (status) {
1153 case -ENOTSOCK:
1154 status = -ENOTCONN;
1155 /* Should we call xs_close() here? */
1156 break;
1157 case -EAGAIN:
1158 status = xs_stream_nospace(req, vm_wait);
1159 break;
1160 case -ECONNRESET:
1161 case -ECONNREFUSED:
1162 case -ENOTCONN:
1163 case -EADDRINUSE:
1164 case -ENOBUFS:
1165 case -EPIPE:
1166 break;
1167 default:
1168 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1169 -status);
1170 }
1171
1172 return status;
1173}
1174
1175static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1176{
1177 transport->old_data_ready = sk->sk_data_ready;
1178 transport->old_state_change = sk->sk_state_change;
1179 transport->old_write_space = sk->sk_write_space;
1180 transport->old_error_report = sk->sk_error_report;
1181}
1182
1183static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1184{
1185 sk->sk_data_ready = transport->old_data_ready;
1186 sk->sk_state_change = transport->old_state_change;
1187 sk->sk_write_space = transport->old_write_space;
1188 sk->sk_error_report = transport->old_error_report;
1189}
1190
1191static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1192{
1193 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1194
1195 transport->xprt_err = 0;
1196 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1197 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1198 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1199 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1200 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1201 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
1202}
1203
1204static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1205{
1206 set_bit(nr, &transport->sock_state);
1207 queue_work(xprtiod_workqueue, &transport->error_worker);
1208}
1209
1210static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1211{
1212 xprt->connect_cookie++;
1213 smp_mb__before_atomic();
1214 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1215 clear_bit(XPRT_CLOSING, &xprt->state);
1216 xs_sock_reset_state_flags(xprt);
1217 smp_mb__after_atomic();
1218}
1219
1220/**
1221 * xs_error_report - callback to handle TCP socket state errors
1222 * @sk: socket
1223 *
1224 * Note: we don't call sock_error() since there may be a rpc_task
1225 * using the socket, and so we don't want to clear sk->sk_err.
1226 */
1227static void xs_error_report(struct sock *sk)
1228{
1229 struct sock_xprt *transport;
1230 struct rpc_xprt *xprt;
1231
1232 if (!(xprt = xprt_from_sock(sk)))
1233 return;
1234
1235 transport = container_of(xprt, struct sock_xprt, xprt);
1236 transport->xprt_err = -sk->sk_err;
1237 if (transport->xprt_err == 0)
1238 return;
1239 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1240 xprt, -transport->xprt_err);
1241 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1242
1243 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1244 smp_mb__before_atomic();
1245 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1246}
1247
1248static void xs_reset_transport(struct sock_xprt *transport)
1249{
1250 struct socket *sock = transport->sock;
1251 struct sock *sk = transport->inet;
1252 struct rpc_xprt *xprt = &transport->xprt;
1253 struct file *filp = transport->file;
1254
1255 if (sk == NULL)
1256 return;
1257 /*
1258 * Make sure we're calling this in a context from which it is safe
1259 * to call __fput_sync(). In practice that means rpciod and the
1260 * system workqueue.
1261 */
1262 if (!(current->flags & PF_WQ_WORKER)) {
1263 WARN_ON_ONCE(1);
1264 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1265 return;
1266 }
1267
1268 if (atomic_read(&transport->xprt.swapper))
1269 sk_clear_memalloc(sk);
1270
1271 tls_handshake_cancel(sk);
1272
1273 kernel_sock_shutdown(sock, SHUT_RDWR);
1274
1275 mutex_lock(&transport->recv_mutex);
1276 lock_sock(sk);
1277 transport->inet = NULL;
1278 transport->sock = NULL;
1279 transport->file = NULL;
1280
1281 sk->sk_user_data = NULL;
1282 sk->sk_sndtimeo = 0;
1283
1284 xs_restore_old_callbacks(transport, sk);
1285 xprt_clear_connected(xprt);
1286 xs_sock_reset_connection_flags(xprt);
1287 /* Reset stream record info */
1288 xs_stream_reset_connect(transport);
1289 release_sock(sk);
1290 mutex_unlock(&transport->recv_mutex);
1291
1292 trace_rpc_socket_close(xprt, sock);
1293 __fput_sync(filp);
1294
1295 xprt_disconnect_done(xprt);
1296}
1297
1298/**
1299 * xs_close - close a socket
1300 * @xprt: transport
1301 *
1302 * This is used when all requests are complete; ie, no DRC state remains
1303 * on the server we want to save.
1304 *
1305 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1306 * xs_reset_transport() zeroing the socket from underneath a writer.
1307 */
1308static void xs_close(struct rpc_xprt *xprt)
1309{
1310 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1311
1312 dprintk("RPC: xs_close xprt %p\n", xprt);
1313
1314 if (transport->sock)
1315 tls_handshake_close(transport->sock);
1316 xs_reset_transport(transport);
1317 xprt->reestablish_timeout = 0;
1318}
1319
1320static void xs_inject_disconnect(struct rpc_xprt *xprt)
1321{
1322 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1323 xprt);
1324 xprt_disconnect_done(xprt);
1325}
1326
1327static void xs_xprt_free(struct rpc_xprt *xprt)
1328{
1329 xs_free_peer_addresses(xprt);
1330 xprt_free(xprt);
1331}
1332
1333/**
1334 * xs_destroy - prepare to shutdown a transport
1335 * @xprt: doomed transport
1336 *
1337 */
1338static void xs_destroy(struct rpc_xprt *xprt)
1339{
1340 struct sock_xprt *transport = container_of(xprt,
1341 struct sock_xprt, xprt);
1342 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1343
1344 cancel_delayed_work_sync(&transport->connect_worker);
1345 xs_close(xprt);
1346 cancel_work_sync(&transport->recv_worker);
1347 cancel_work_sync(&transport->error_worker);
1348 xs_xprt_free(xprt);
1349 module_put(THIS_MODULE);
1350}
1351
1352/**
1353 * xs_udp_data_read_skb - receive callback for UDP sockets
1354 * @xprt: transport
1355 * @sk: socket
1356 * @skb: skbuff
1357 *
1358 */
1359static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1360 struct sock *sk,
1361 struct sk_buff *skb)
1362{
1363 struct rpc_task *task;
1364 struct rpc_rqst *rovr;
1365 int repsize, copied;
1366 u32 _xid;
1367 __be32 *xp;
1368
1369 repsize = skb->len;
1370 if (repsize < 4) {
1371 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1372 return;
1373 }
1374
1375 /* Copy the XID from the skb... */
1376 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1377 if (xp == NULL)
1378 return;
1379
1380 /* Look up and lock the request corresponding to the given XID */
1381 spin_lock(&xprt->queue_lock);
1382 rovr = xprt_lookup_rqst(xprt, *xp);
1383 if (!rovr)
1384 goto out_unlock;
1385 xprt_pin_rqst(rovr);
1386 xprt_update_rtt(rovr->rq_task);
1387 spin_unlock(&xprt->queue_lock);
1388 task = rovr->rq_task;
1389
1390 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1391 copied = repsize;
1392
1393 /* Suck it into the iovec, verify checksum if not done by hw. */
1394 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1395 spin_lock(&xprt->queue_lock);
1396 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1397 goto out_unpin;
1398 }
1399
1400
1401 spin_lock(&xprt->transport_lock);
1402 xprt_adjust_cwnd(xprt, task, copied);
1403 spin_unlock(&xprt->transport_lock);
1404 spin_lock(&xprt->queue_lock);
1405 xprt_complete_rqst(task, copied);
1406 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1407out_unpin:
1408 xprt_unpin_rqst(rovr);
1409 out_unlock:
1410 spin_unlock(&xprt->queue_lock);
1411}
1412
1413static void xs_udp_data_receive(struct sock_xprt *transport)
1414{
1415 struct sk_buff *skb;
1416 struct sock *sk;
1417 int err;
1418
1419 mutex_lock(&transport->recv_mutex);
1420 sk = transport->inet;
1421 if (sk == NULL)
1422 goto out;
1423 for (;;) {
1424 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err);
1425 if (skb == NULL)
1426 break;
1427 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1428 consume_skb(skb);
1429 cond_resched();
1430 }
1431 xs_poll_check_readable(transport);
1432out:
1433 mutex_unlock(&transport->recv_mutex);
1434}
1435
1436static void xs_udp_data_receive_workfn(struct work_struct *work)
1437{
1438 struct sock_xprt *transport =
1439 container_of(work, struct sock_xprt, recv_worker);
1440 unsigned int pflags = memalloc_nofs_save();
1441
1442 xs_udp_data_receive(transport);
1443 memalloc_nofs_restore(pflags);
1444}
1445
1446/**
1447 * xs_data_ready - "data ready" callback for sockets
1448 * @sk: socket with data to read
1449 *
1450 */
1451static void xs_data_ready(struct sock *sk)
1452{
1453 struct rpc_xprt *xprt;
1454
1455 trace_sk_data_ready(sk);
1456
1457 xprt = xprt_from_sock(sk);
1458 if (xprt != NULL) {
1459 struct sock_xprt *transport = container_of(xprt,
1460 struct sock_xprt, xprt);
1461
1462 trace_xs_data_ready(xprt);
1463
1464 transport->old_data_ready(sk);
1465
1466 if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
1467 return;
1468
1469 /* Any data means we had a useful conversation, so
1470 * then we don't need to delay the next reconnect
1471 */
1472 if (xprt->reestablish_timeout)
1473 xprt->reestablish_timeout = 0;
1474 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1475 queue_work(xprtiod_workqueue, &transport->recv_worker);
1476 }
1477}
1478
1479/*
1480 * Helper function to force a TCP close if the server is sending
1481 * junk and/or it has put us in CLOSE_WAIT
1482 */
1483static void xs_tcp_force_close(struct rpc_xprt *xprt)
1484{
1485 xprt_force_disconnect(xprt);
1486}
1487
1488#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1489static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1490{
1491 return PAGE_SIZE;
1492}
1493#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1494
1495/**
1496 * xs_local_state_change - callback to handle AF_LOCAL socket state changes
1497 * @sk: socket whose state has changed
1498 *
1499 */
1500static void xs_local_state_change(struct sock *sk)
1501{
1502 struct rpc_xprt *xprt;
1503 struct sock_xprt *transport;
1504
1505 if (!(xprt = xprt_from_sock(sk)))
1506 return;
1507 transport = container_of(xprt, struct sock_xprt, xprt);
1508 if (sk->sk_shutdown & SHUTDOWN_MASK) {
1509 clear_bit(XPRT_CONNECTED, &xprt->state);
1510 /* Trigger the socket release */
1511 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1512 }
1513}
1514
1515/**
1516 * xs_tcp_state_change - callback to handle TCP socket state changes
1517 * @sk: socket whose state has changed
1518 *
1519 */
1520static void xs_tcp_state_change(struct sock *sk)
1521{
1522 struct rpc_xprt *xprt;
1523 struct sock_xprt *transport;
1524
1525 if (!(xprt = xprt_from_sock(sk)))
1526 return;
1527 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1528 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1529 sk->sk_state, xprt_connected(xprt),
1530 sock_flag(sk, SOCK_DEAD),
1531 sock_flag(sk, SOCK_ZAPPED),
1532 sk->sk_shutdown);
1533
1534 transport = container_of(xprt, struct sock_xprt, xprt);
1535 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1536 switch (sk->sk_state) {
1537 case TCP_ESTABLISHED:
1538 if (!xprt_test_and_set_connected(xprt)) {
1539 xprt->connect_cookie++;
1540 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1541 xprt_clear_connecting(xprt);
1542
1543 xprt->stat.connect_count++;
1544 xprt->stat.connect_time += (long)jiffies -
1545 xprt->stat.connect_start;
1546 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1547 }
1548 break;
1549 case TCP_FIN_WAIT1:
1550 /* The client initiated a shutdown of the socket */
1551 xprt->connect_cookie++;
1552 xprt->reestablish_timeout = 0;
1553 set_bit(XPRT_CLOSING, &xprt->state);
1554 smp_mb__before_atomic();
1555 clear_bit(XPRT_CONNECTED, &xprt->state);
1556 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1557 smp_mb__after_atomic();
1558 break;
1559 case TCP_CLOSE_WAIT:
1560 /* The server initiated a shutdown of the socket */
1561 xprt->connect_cookie++;
1562 clear_bit(XPRT_CONNECTED, &xprt->state);
1563 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1564 fallthrough;
1565 case TCP_CLOSING:
1566 /*
1567 * If the server closed down the connection, make sure that
1568 * we back off before reconnecting
1569 */
1570 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1571 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1572 break;
1573 case TCP_LAST_ACK:
1574 set_bit(XPRT_CLOSING, &xprt->state);
1575 smp_mb__before_atomic();
1576 clear_bit(XPRT_CONNECTED, &xprt->state);
1577 smp_mb__after_atomic();
1578 break;
1579 case TCP_CLOSE:
1580 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1581 &transport->sock_state)) {
1582 xs_reset_srcport(transport);
1583 xprt_clear_connecting(xprt);
1584 }
1585 clear_bit(XPRT_CLOSING, &xprt->state);
1586 /* Trigger the socket release */
1587 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1588 }
1589}
1590
1591static void xs_write_space(struct sock *sk)
1592{
1593 struct sock_xprt *transport;
1594 struct rpc_xprt *xprt;
1595
1596 if (!sk->sk_socket)
1597 return;
1598 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1599
1600 if (unlikely(!(xprt = xprt_from_sock(sk))))
1601 return;
1602 transport = container_of(xprt, struct sock_xprt, xprt);
1603 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state))
1604 return;
1605 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1606 sk->sk_write_pending--;
1607}
1608
1609/**
1610 * xs_udp_write_space - callback invoked when socket buffer space
1611 * becomes available
1612 * @sk: socket whose state has changed
1613 *
1614 * Called when more output buffer space is available for this socket.
1615 * We try not to wake our writers until they can make "significant"
1616 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1617 * with a bunch of small requests.
1618 */
1619static void xs_udp_write_space(struct sock *sk)
1620{
1621 /* from net/core/sock.c:sock_def_write_space */
1622 if (sock_writeable(sk))
1623 xs_write_space(sk);
1624}
1625
1626/**
1627 * xs_tcp_write_space - callback invoked when socket buffer space
1628 * becomes available
1629 * @sk: socket whose state has changed
1630 *
1631 * Called when more output buffer space is available for this socket.
1632 * We try not to wake our writers until they can make "significant"
1633 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1634 * with a bunch of small requests.
1635 */
1636static void xs_tcp_write_space(struct sock *sk)
1637{
1638 /* from net/core/stream.c:sk_stream_write_space */
1639 if (sk_stream_is_writeable(sk))
1640 xs_write_space(sk);
1641}
1642
1643static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1644{
1645 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1646 struct sock *sk = transport->inet;
1647
1648 if (transport->rcvsize) {
1649 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1650 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1651 }
1652 if (transport->sndsize) {
1653 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1654 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1655 sk->sk_write_space(sk);
1656 }
1657}
1658
1659/**
1660 * xs_udp_set_buffer_size - set send and receive limits
1661 * @xprt: generic transport
1662 * @sndsize: requested size of send buffer, in bytes
1663 * @rcvsize: requested size of receive buffer, in bytes
1664 *
1665 * Set socket send and receive buffer size limits.
1666 */
1667static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1668{
1669 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1670
1671 transport->sndsize = 0;
1672 if (sndsize)
1673 transport->sndsize = sndsize + 1024;
1674 transport->rcvsize = 0;
1675 if (rcvsize)
1676 transport->rcvsize = rcvsize + 1024;
1677
1678 xs_udp_do_set_buffer_size(xprt);
1679}
1680
1681/**
1682 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1683 * @xprt: controlling transport
1684 * @task: task that timed out
1685 *
1686 * Adjust the congestion window after a retransmit timeout has occurred.
1687 */
1688static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1689{
1690 spin_lock(&xprt->transport_lock);
1691 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1692 spin_unlock(&xprt->transport_lock);
1693}
1694
1695static int xs_get_random_port(void)
1696{
1697 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1698 unsigned short range;
1699 unsigned short rand;
1700
1701 if (max < min)
1702 return -EADDRINUSE;
1703 range = max - min + 1;
1704 rand = get_random_u32_below(range);
1705 return rand + min;
1706}
1707
1708static unsigned short xs_sock_getport(struct socket *sock)
1709{
1710 struct sockaddr_storage buf;
1711 unsigned short port = 0;
1712
1713 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1714 goto out;
1715 switch (buf.ss_family) {
1716 case AF_INET6:
1717 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1718 break;
1719 case AF_INET:
1720 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1721 }
1722out:
1723 return port;
1724}
1725
1726/**
1727 * xs_set_port - reset the port number in the remote endpoint address
1728 * @xprt: generic transport
1729 * @port: new port number
1730 *
1731 */
1732static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1733{
1734 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1735
1736 rpc_set_port(xs_addr(xprt), port);
1737 xs_update_peer_port(xprt);
1738}
1739
1740static void xs_reset_srcport(struct sock_xprt *transport)
1741{
1742 transport->srcport = 0;
1743}
1744
1745static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1746{
1747 if (transport->srcport == 0 && transport->xprt.reuseport)
1748 transport->srcport = xs_sock_getport(sock);
1749}
1750
1751static int xs_get_srcport(struct sock_xprt *transport)
1752{
1753 int port = transport->srcport;
1754
1755 if (port == 0 && transport->xprt.resvport)
1756 port = xs_get_random_port();
1757 return port;
1758}
1759
1760static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1761{
1762 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1763 unsigned short ret = 0;
1764 mutex_lock(&sock->recv_mutex);
1765 if (sock->sock)
1766 ret = xs_sock_getport(sock->sock);
1767 mutex_unlock(&sock->recv_mutex);
1768 return ret;
1769}
1770
1771static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1772{
1773 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1774 union {
1775 struct sockaddr sa;
1776 struct sockaddr_storage st;
1777 } saddr;
1778 int ret = -ENOTCONN;
1779
1780 mutex_lock(&sock->recv_mutex);
1781 if (sock->sock) {
1782 ret = kernel_getsockname(sock->sock, &saddr.sa);
1783 if (ret >= 0)
1784 ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1785 }
1786 mutex_unlock(&sock->recv_mutex);
1787 return ret;
1788}
1789
1790static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1791{
1792 if (transport->srcport != 0)
1793 transport->srcport = 0;
1794 if (!transport->xprt.resvport)
1795 return 0;
1796 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1797 return xprt_max_resvport;
1798 return --port;
1799}
1800static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1801{
1802 struct sockaddr_storage myaddr;
1803 int err, nloop = 0;
1804 int port = xs_get_srcport(transport);
1805 unsigned short last;
1806
1807 /*
1808 * If we are asking for any ephemeral port (i.e. port == 0 &&
1809 * transport->xprt.resvport == 0), don't bind. Let the local
1810 * port selection happen implicitly when the socket is used
1811 * (for example at connect time).
1812 *
1813 * This ensures that we can continue to establish TCP
1814 * connections even when all local ephemeral ports are already
1815 * a part of some TCP connection. This makes no difference
1816 * for UDP sockets, but also doesn't harm them.
1817 *
1818 * If we're asking for any reserved port (i.e. port == 0 &&
1819 * transport->xprt.resvport == 1) xs_get_srcport above will
1820 * ensure that port is non-zero and we will bind as needed.
1821 */
1822 if (port <= 0)
1823 return port;
1824
1825 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1826 do {
1827 rpc_set_port((struct sockaddr *)&myaddr, port);
1828 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1829 transport->xprt.addrlen);
1830 if (err == 0) {
1831 if (transport->xprt.reuseport)
1832 transport->srcport = port;
1833 break;
1834 }
1835 last = port;
1836 port = xs_next_srcport(transport, port);
1837 if (port > last)
1838 nloop++;
1839 } while (err == -EADDRINUSE && nloop != 2);
1840
1841 if (myaddr.ss_family == AF_INET)
1842 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1843 &((struct sockaddr_in *)&myaddr)->sin_addr,
1844 port, err ? "failed" : "ok", err);
1845 else
1846 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1847 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1848 port, err ? "failed" : "ok", err);
1849 return err;
1850}
1851
1852/*
1853 * We don't support autobind on AF_LOCAL sockets
1854 */
1855static void xs_local_rpcbind(struct rpc_task *task)
1856{
1857 xprt_set_bound(task->tk_xprt);
1858}
1859
1860static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1861{
1862}
1863
1864#ifdef CONFIG_DEBUG_LOCK_ALLOC
1865static struct lock_class_key xs_key[3];
1866static struct lock_class_key xs_slock_key[3];
1867
1868static inline void xs_reclassify_socketu(struct socket *sock)
1869{
1870 struct sock *sk = sock->sk;
1871
1872 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1873 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1874}
1875
1876static inline void xs_reclassify_socket4(struct socket *sock)
1877{
1878 struct sock *sk = sock->sk;
1879
1880 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1881 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1882}
1883
1884static inline void xs_reclassify_socket6(struct socket *sock)
1885{
1886 struct sock *sk = sock->sk;
1887
1888 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1889 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1890}
1891
1892static inline void xs_reclassify_socket(int family, struct socket *sock)
1893{
1894 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1895 return;
1896
1897 switch (family) {
1898 case AF_LOCAL:
1899 xs_reclassify_socketu(sock);
1900 break;
1901 case AF_INET:
1902 xs_reclassify_socket4(sock);
1903 break;
1904 case AF_INET6:
1905 xs_reclassify_socket6(sock);
1906 break;
1907 }
1908}
1909#else
1910static inline void xs_reclassify_socket(int family, struct socket *sock)
1911{
1912}
1913#endif
1914
1915static void xs_dummy_setup_socket(struct work_struct *work)
1916{
1917}
1918
1919static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1920 struct sock_xprt *transport, int family, int type,
1921 int protocol, bool reuseport)
1922{
1923 struct file *filp;
1924 struct socket *sock;
1925 int err;
1926
1927 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1928 if (err < 0) {
1929 dprintk("RPC: can't create %d transport socket (%d).\n",
1930 protocol, -err);
1931 goto out;
1932 }
1933 xs_reclassify_socket(family, sock);
1934
1935 if (reuseport)
1936 sock_set_reuseport(sock->sk);
1937
1938 err = xs_bind(transport, sock);
1939 if (err) {
1940 sock_release(sock);
1941 goto out;
1942 }
1943
1944 if (protocol == IPPROTO_TCP)
1945 sk_net_refcnt_upgrade(sock->sk);
1946
1947 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1948 if (IS_ERR(filp))
1949 return ERR_CAST(filp);
1950 transport->file = filp;
1951
1952 return sock;
1953out:
1954 return ERR_PTR(err);
1955}
1956
1957static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1958 struct socket *sock)
1959{
1960 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1961 xprt);
1962
1963 if (!transport->inet) {
1964 struct sock *sk = sock->sk;
1965
1966 lock_sock(sk);
1967
1968 xs_save_old_callbacks(transport, sk);
1969
1970 sk->sk_user_data = xprt;
1971 sk->sk_data_ready = xs_data_ready;
1972 sk->sk_write_space = xs_udp_write_space;
1973 sk->sk_state_change = xs_local_state_change;
1974 sk->sk_error_report = xs_error_report;
1975 sk->sk_use_task_frag = false;
1976
1977 xprt_clear_connected(xprt);
1978
1979 /* Reset to new socket */
1980 transport->sock = sock;
1981 transport->inet = sk;
1982
1983 release_sock(sk);
1984 }
1985
1986 xs_stream_start_connect(transport);
1987
1988 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1989}
1990
1991/**
1992 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1993 * @transport: socket transport to connect
1994 */
1995static int xs_local_setup_socket(struct sock_xprt *transport)
1996{
1997 struct rpc_xprt *xprt = &transport->xprt;
1998 struct file *filp;
1999 struct socket *sock;
2000 int status;
2001
2002 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2003 SOCK_STREAM, 0, &sock, 1);
2004 if (status < 0) {
2005 dprintk("RPC: can't create AF_LOCAL "
2006 "transport socket (%d).\n", -status);
2007 goto out;
2008 }
2009 xs_reclassify_socket(AF_LOCAL, sock);
2010
2011 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
2012 if (IS_ERR(filp)) {
2013 status = PTR_ERR(filp);
2014 goto out;
2015 }
2016 transport->file = filp;
2017
2018 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2019 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2020
2021 status = xs_local_finish_connecting(xprt, sock);
2022 trace_rpc_socket_connect(xprt, sock, status);
2023 switch (status) {
2024 case 0:
2025 dprintk("RPC: xprt %p connected to %s\n",
2026 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2027 xprt->stat.connect_count++;
2028 xprt->stat.connect_time += (long)jiffies -
2029 xprt->stat.connect_start;
2030 xprt_set_connected(xprt);
2031 break;
2032 case -ENOBUFS:
2033 break;
2034 case -ENOENT:
2035 dprintk("RPC: xprt %p: socket %s does not exist\n",
2036 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2037 break;
2038 case -ECONNREFUSED:
2039 dprintk("RPC: xprt %p: connection refused for %s\n",
2040 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2041 break;
2042 default:
2043 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2044 __func__, -status,
2045 xprt->address_strings[RPC_DISPLAY_ADDR]);
2046 }
2047
2048out:
2049 xprt_clear_connecting(xprt);
2050 xprt_wake_pending_tasks(xprt, status);
2051 return status;
2052}
2053
2054static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2055{
2056 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2057 int ret;
2058
2059 if (transport->file)
2060 goto force_disconnect;
2061
2062 if (RPC_IS_ASYNC(task)) {
2063 /*
2064 * We want the AF_LOCAL connect to be resolved in the
2065 * filesystem namespace of the process making the rpc
2066 * call. Thus we connect synchronously.
2067 *
2068 * If we want to support asynchronous AF_LOCAL calls,
2069 * we'll need to figure out how to pass a namespace to
2070 * connect.
2071 */
2072 rpc_task_set_rpc_status(task, -ENOTCONN);
2073 goto out_wake;
2074 }
2075 ret = xs_local_setup_socket(transport);
2076 if (ret && !RPC_IS_SOFTCONN(task))
2077 msleep_interruptible(15000);
2078 return;
2079force_disconnect:
2080 xprt_force_disconnect(xprt);
2081out_wake:
2082 xprt_clear_connecting(xprt);
2083 xprt_wake_pending_tasks(xprt, -ENOTCONN);
2084}
2085
2086#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2087/*
2088 * Note that this should be called with XPRT_LOCKED held, or recv_mutex
2089 * held, or when we otherwise know that we have exclusive access to the
2090 * socket, to guard against races with xs_reset_transport.
2091 */
2092static void xs_set_memalloc(struct rpc_xprt *xprt)
2093{
2094 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2095 xprt);
2096
2097 /*
2098 * If there's no sock, then we have nothing to set. The
2099 * reconnecting process will get it for us.
2100 */
2101 if (!transport->inet)
2102 return;
2103 if (atomic_read(&xprt->swapper))
2104 sk_set_memalloc(transport->inet);
2105}
2106
2107/**
2108 * xs_enable_swap - Tag this transport as being used for swap.
2109 * @xprt: transport to tag
2110 *
2111 * Take a reference to this transport on behalf of the rpc_clnt, and
2112 * optionally mark it for swapping if it wasn't already.
2113 */
2114static int
2115xs_enable_swap(struct rpc_xprt *xprt)
2116{
2117 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2118
2119 mutex_lock(&xs->recv_mutex);
2120 if (atomic_inc_return(&xprt->swapper) == 1 &&
2121 xs->inet)
2122 sk_set_memalloc(xs->inet);
2123 mutex_unlock(&xs->recv_mutex);
2124 return 0;
2125}
2126
2127/**
2128 * xs_disable_swap - Untag this transport as being used for swap.
2129 * @xprt: transport to tag
2130 *
2131 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2132 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2133 */
2134static void
2135xs_disable_swap(struct rpc_xprt *xprt)
2136{
2137 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2138
2139 mutex_lock(&xs->recv_mutex);
2140 if (atomic_dec_and_test(&xprt->swapper) &&
2141 xs->inet)
2142 sk_clear_memalloc(xs->inet);
2143 mutex_unlock(&xs->recv_mutex);
2144}
2145#else
2146static void xs_set_memalloc(struct rpc_xprt *xprt)
2147{
2148}
2149
2150static int
2151xs_enable_swap(struct rpc_xprt *xprt)
2152{
2153 return -EINVAL;
2154}
2155
2156static void
2157xs_disable_swap(struct rpc_xprt *xprt)
2158{
2159}
2160#endif
2161
2162static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2163{
2164 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2165
2166 if (!transport->inet) {
2167 struct sock *sk = sock->sk;
2168
2169 lock_sock(sk);
2170
2171 xs_save_old_callbacks(transport, sk);
2172
2173 sk->sk_user_data = xprt;
2174 sk->sk_data_ready = xs_data_ready;
2175 sk->sk_write_space = xs_udp_write_space;
2176 sk->sk_use_task_frag = false;
2177
2178 xprt_set_connected(xprt);
2179
2180 /* Reset to new socket */
2181 transport->sock = sock;
2182 transport->inet = sk;
2183
2184 xs_set_memalloc(xprt);
2185
2186 release_sock(sk);
2187 }
2188 xs_udp_do_set_buffer_size(xprt);
2189
2190 xprt->stat.connect_start = jiffies;
2191}
2192
2193static void xs_udp_setup_socket(struct work_struct *work)
2194{
2195 struct sock_xprt *transport =
2196 container_of(work, struct sock_xprt, connect_worker.work);
2197 struct rpc_xprt *xprt = &transport->xprt;
2198 struct socket *sock;
2199 int status = -EIO;
2200 unsigned int pflags = current->flags;
2201
2202 if (atomic_read(&xprt->swapper))
2203 current->flags |= PF_MEMALLOC;
2204 sock = xs_create_sock(xprt, transport,
2205 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2206 IPPROTO_UDP, false);
2207 if (IS_ERR(sock))
2208 goto out;
2209
2210 dprintk("RPC: worker connecting xprt %p via %s to "
2211 "%s (port %s)\n", xprt,
2212 xprt->address_strings[RPC_DISPLAY_PROTO],
2213 xprt->address_strings[RPC_DISPLAY_ADDR],
2214 xprt->address_strings[RPC_DISPLAY_PORT]);
2215
2216 xs_udp_finish_connecting(xprt, sock);
2217 trace_rpc_socket_connect(xprt, sock, 0);
2218 status = 0;
2219out:
2220 xprt_clear_connecting(xprt);
2221 xprt_unlock_connect(xprt, transport);
2222 xprt_wake_pending_tasks(xprt, status);
2223 current_restore_flags(pflags, PF_MEMALLOC);
2224}
2225
2226/**
2227 * xs_tcp_shutdown - gracefully shut down a TCP socket
2228 * @xprt: transport
2229 *
2230 * Initiates a graceful shutdown of the TCP socket by calling the
2231 * equivalent of shutdown(SHUT_RDWR);
2232 */
2233static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2234{
2235 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2236 struct socket *sock = transport->sock;
2237 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2238
2239 if (sock == NULL)
2240 return;
2241 if (!xprt->reuseport) {
2242 xs_close(xprt);
2243 return;
2244 }
2245 switch (skst) {
2246 case TCP_FIN_WAIT1:
2247 case TCP_FIN_WAIT2:
2248 case TCP_LAST_ACK:
2249 break;
2250 case TCP_ESTABLISHED:
2251 case TCP_CLOSE_WAIT:
2252 kernel_sock_shutdown(sock, SHUT_RDWR);
2253 trace_rpc_socket_shutdown(xprt, sock);
2254 break;
2255 default:
2256 xs_reset_transport(transport);
2257 }
2258}
2259
2260static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2261 struct socket *sock)
2262{
2263 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2264 struct net *net = sock_net(sock->sk);
2265 unsigned long connect_timeout;
2266 unsigned long syn_retries;
2267 unsigned int keepidle;
2268 unsigned int keepcnt;
2269 unsigned int timeo;
2270 unsigned long t;
2271
2272 spin_lock(&xprt->transport_lock);
2273 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2274 keepcnt = xprt->timeout->to_retries + 1;
2275 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2276 (xprt->timeout->to_retries + 1);
2277 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2278 spin_unlock(&xprt->transport_lock);
2279
2280 /* TCP Keepalive options */
2281 sock_set_keepalive(sock->sk);
2282 tcp_sock_set_keepidle(sock->sk, keepidle);
2283 tcp_sock_set_keepintvl(sock->sk, keepidle);
2284 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2285
2286 /* TCP user timeout (see RFC5482) */
2287 tcp_sock_set_user_timeout(sock->sk, timeo);
2288
2289 /* Connect timeout */
2290 connect_timeout = max_t(unsigned long,
2291 DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
2292 syn_retries = max_t(unsigned long,
2293 READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
2294 for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
2295 ;
2296 if (t <= syn_retries)
2297 tcp_sock_set_syncnt(sock->sk, t - 1);
2298}
2299
2300static void xs_tcp_do_set_connect_timeout(struct rpc_xprt *xprt,
2301 unsigned long connect_timeout)
2302{
2303 struct sock_xprt *transport =
2304 container_of(xprt, struct sock_xprt, xprt);
2305 struct rpc_timeout to;
2306 unsigned long initval;
2307
2308 memcpy(&to, xprt->timeout, sizeof(to));
2309 /* Arbitrary lower limit */
2310 initval = max_t(unsigned long, connect_timeout, XS_TCP_INIT_REEST_TO);
2311 to.to_initval = initval;
2312 to.to_maxval = initval;
2313 to.to_retries = 0;
2314 memcpy(&transport->tcp_timeout, &to, sizeof(transport->tcp_timeout));
2315 xprt->timeout = &transport->tcp_timeout;
2316 xprt->connect_timeout = connect_timeout;
2317}
2318
2319static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2320 unsigned long connect_timeout,
2321 unsigned long reconnect_timeout)
2322{
2323 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2324
2325 spin_lock(&xprt->transport_lock);
2326 if (reconnect_timeout < xprt->max_reconnect_timeout)
2327 xprt->max_reconnect_timeout = reconnect_timeout;
2328 if (connect_timeout < xprt->connect_timeout)
2329 xs_tcp_do_set_connect_timeout(xprt, connect_timeout);
2330 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2331 spin_unlock(&xprt->transport_lock);
2332}
2333
2334static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2335{
2336 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2337
2338 if (!transport->inet) {
2339 struct sock *sk = sock->sk;
2340
2341 /* Avoid temporary address, they are bad for long-lived
2342 * connections such as NFS mounts.
2343 * RFC4941, section 3.6 suggests that:
2344 * Individual applications, which have specific
2345 * knowledge about the normal duration of connections,
2346 * MAY override this as appropriate.
2347 */
2348 if (xs_addr(xprt)->sa_family == PF_INET6) {
2349 ip6_sock_set_addr_preferences(sk,
2350 IPV6_PREFER_SRC_PUBLIC);
2351 }
2352
2353 xs_tcp_set_socket_timeouts(xprt, sock);
2354 tcp_sock_set_nodelay(sk);
2355
2356 lock_sock(sk);
2357
2358 xs_save_old_callbacks(transport, sk);
2359
2360 sk->sk_user_data = xprt;
2361 sk->sk_data_ready = xs_data_ready;
2362 sk->sk_state_change = xs_tcp_state_change;
2363 sk->sk_write_space = xs_tcp_write_space;
2364 sk->sk_error_report = xs_error_report;
2365 sk->sk_use_task_frag = false;
2366
2367 /* socket options */
2368 sock_reset_flag(sk, SOCK_LINGER);
2369
2370 xprt_clear_connected(xprt);
2371
2372 /* Reset to new socket */
2373 transport->sock = sock;
2374 transport->inet = sk;
2375
2376 release_sock(sk);
2377 }
2378
2379 if (!xprt_bound(xprt))
2380 return -ENOTCONN;
2381
2382 xs_set_memalloc(xprt);
2383
2384 xs_stream_start_connect(transport);
2385
2386 /* Tell the socket layer to start connecting... */
2387 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2388 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2389}
2390
2391/**
2392 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2393 * @work: queued work item
2394 *
2395 * Invoked by a work queue tasklet.
2396 */
2397static void xs_tcp_setup_socket(struct work_struct *work)
2398{
2399 struct sock_xprt *transport =
2400 container_of(work, struct sock_xprt, connect_worker.work);
2401 struct socket *sock = transport->sock;
2402 struct rpc_xprt *xprt = &transport->xprt;
2403 int status;
2404 unsigned int pflags = current->flags;
2405
2406 if (atomic_read(&xprt->swapper))
2407 current->flags |= PF_MEMALLOC;
2408
2409 if (xprt_connected(xprt))
2410 goto out;
2411 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2412 &transport->sock_state) ||
2413 !sock) {
2414 xs_reset_transport(transport);
2415 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2416 SOCK_STREAM, IPPROTO_TCP, true);
2417 if (IS_ERR(sock)) {
2418 xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2419 goto out;
2420 }
2421 }
2422
2423 dprintk("RPC: worker connecting xprt %p via %s to "
2424 "%s (port %s)\n", xprt,
2425 xprt->address_strings[RPC_DISPLAY_PROTO],
2426 xprt->address_strings[RPC_DISPLAY_ADDR],
2427 xprt->address_strings[RPC_DISPLAY_PORT]);
2428
2429 status = xs_tcp_finish_connecting(xprt, sock);
2430 trace_rpc_socket_connect(xprt, sock, status);
2431 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2432 xprt, -status, xprt_connected(xprt),
2433 sock->sk->sk_state);
2434 switch (status) {
2435 case 0:
2436 case -EINPROGRESS:
2437 /* SYN_SENT! */
2438 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2439 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2440 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2441 fallthrough;
2442 case -EALREADY:
2443 goto out_unlock;
2444 case -EADDRNOTAVAIL:
2445 /* Source port number is unavailable. Try a new one! */
2446 transport->srcport = 0;
2447 status = -EAGAIN;
2448 break;
2449 case -EPERM:
2450 /* Happens, for instance, if a BPF program is preventing
2451 * the connect. Remap the error so upper layers can better
2452 * deal with it.
2453 */
2454 status = -ECONNREFUSED;
2455 fallthrough;
2456 case -EINVAL:
2457 /* Happens, for instance, if the user specified a link
2458 * local IPv6 address without a scope-id.
2459 */
2460 case -ECONNREFUSED:
2461 case -ECONNRESET:
2462 case -ENETDOWN:
2463 case -ENETUNREACH:
2464 case -EHOSTUNREACH:
2465 case -EADDRINUSE:
2466 case -ENOBUFS:
2467 case -ENOTCONN:
2468 break;
2469 default:
2470 printk("%s: connect returned unhandled error %d\n",
2471 __func__, status);
2472 status = -EAGAIN;
2473 }
2474
2475 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2476 * We need to wake them first to ensure the correct error code.
2477 */
2478 xprt_wake_pending_tasks(xprt, status);
2479 xs_tcp_force_close(xprt);
2480out:
2481 xprt_clear_connecting(xprt);
2482out_unlock:
2483 xprt_unlock_connect(xprt, transport);
2484 current_restore_flags(pflags, PF_MEMALLOC);
2485}
2486
2487/*
2488 * Transfer the connected socket to @upper_transport, then mark that
2489 * xprt CONNECTED.
2490 */
2491static int xs_tcp_tls_finish_connecting(struct rpc_xprt *lower_xprt,
2492 struct sock_xprt *upper_transport)
2493{
2494 struct sock_xprt *lower_transport =
2495 container_of(lower_xprt, struct sock_xprt, xprt);
2496 struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2497
2498 if (!upper_transport->inet) {
2499 struct socket *sock = lower_transport->sock;
2500 struct sock *sk = sock->sk;
2501
2502 /* Avoid temporary address, they are bad for long-lived
2503 * connections such as NFS mounts.
2504 * RFC4941, section 3.6 suggests that:
2505 * Individual applications, which have specific
2506 * knowledge about the normal duration of connections,
2507 * MAY override this as appropriate.
2508 */
2509 if (xs_addr(upper_xprt)->sa_family == PF_INET6)
2510 ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2511
2512 xs_tcp_set_socket_timeouts(upper_xprt, sock);
2513 tcp_sock_set_nodelay(sk);
2514
2515 lock_sock(sk);
2516
2517 /* @sk is already connected, so it now has the RPC callbacks.
2518 * Reach into @lower_transport to save the original ones.
2519 */
2520 upper_transport->old_data_ready = lower_transport->old_data_ready;
2521 upper_transport->old_state_change = lower_transport->old_state_change;
2522 upper_transport->old_write_space = lower_transport->old_write_space;
2523 upper_transport->old_error_report = lower_transport->old_error_report;
2524 sk->sk_user_data = upper_xprt;
2525
2526 /* socket options */
2527 sock_reset_flag(sk, SOCK_LINGER);
2528
2529 xprt_clear_connected(upper_xprt);
2530
2531 upper_transport->sock = sock;
2532 upper_transport->inet = sk;
2533 upper_transport->file = lower_transport->file;
2534
2535 release_sock(sk);
2536
2537 /* Reset lower_transport before shutting down its clnt */
2538 mutex_lock(&lower_transport->recv_mutex);
2539 lower_transport->inet = NULL;
2540 lower_transport->sock = NULL;
2541 lower_transport->file = NULL;
2542
2543 xprt_clear_connected(lower_xprt);
2544 xs_sock_reset_connection_flags(lower_xprt);
2545 xs_stream_reset_connect(lower_transport);
2546 mutex_unlock(&lower_transport->recv_mutex);
2547 }
2548
2549 if (!xprt_bound(upper_xprt))
2550 return -ENOTCONN;
2551
2552 xs_set_memalloc(upper_xprt);
2553
2554 if (!xprt_test_and_set_connected(upper_xprt)) {
2555 upper_xprt->connect_cookie++;
2556 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2557 xprt_clear_connecting(upper_xprt);
2558
2559 upper_xprt->stat.connect_count++;
2560 upper_xprt->stat.connect_time += (long)jiffies -
2561 upper_xprt->stat.connect_start;
2562 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2563 }
2564 return 0;
2565}
2566
2567/**
2568 * xs_tls_handshake_done - TLS handshake completion handler
2569 * @data: address of xprt to wake
2570 * @status: status of handshake
2571 * @peerid: serial number of key containing the remote's identity
2572 *
2573 */
2574static void xs_tls_handshake_done(void *data, int status, key_serial_t peerid)
2575{
2576 struct rpc_xprt *lower_xprt = data;
2577 struct sock_xprt *lower_transport =
2578 container_of(lower_xprt, struct sock_xprt, xprt);
2579
2580 switch (status) {
2581 case 0:
2582 case -EACCES:
2583 case -ETIMEDOUT:
2584 lower_transport->xprt_err = status;
2585 break;
2586 default:
2587 lower_transport->xprt_err = -EACCES;
2588 }
2589 complete(&lower_transport->handshake_done);
2590 xprt_put(lower_xprt);
2591}
2592
2593static int xs_tls_handshake_sync(struct rpc_xprt *lower_xprt, struct xprtsec_parms *xprtsec)
2594{
2595 struct sock_xprt *lower_transport =
2596 container_of(lower_xprt, struct sock_xprt, xprt);
2597 struct tls_handshake_args args = {
2598 .ta_sock = lower_transport->sock,
2599 .ta_done = xs_tls_handshake_done,
2600 .ta_data = xprt_get(lower_xprt),
2601 .ta_peername = lower_xprt->servername,
2602 };
2603 struct sock *sk = lower_transport->inet;
2604 int rc;
2605
2606 init_completion(&lower_transport->handshake_done);
2607 set_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2608 lower_transport->xprt_err = -ETIMEDOUT;
2609 switch (xprtsec->policy) {
2610 case RPC_XPRTSEC_TLS_ANON:
2611 rc = tls_client_hello_anon(&args, GFP_KERNEL);
2612 if (rc)
2613 goto out_put_xprt;
2614 break;
2615 case RPC_XPRTSEC_TLS_X509:
2616 args.ta_my_cert = xprtsec->cert_serial;
2617 args.ta_my_privkey = xprtsec->privkey_serial;
2618 rc = tls_client_hello_x509(&args, GFP_KERNEL);
2619 if (rc)
2620 goto out_put_xprt;
2621 break;
2622 default:
2623 rc = -EACCES;
2624 goto out_put_xprt;
2625 }
2626
2627 rc = wait_for_completion_interruptible_timeout(&lower_transport->handshake_done,
2628 XS_TLS_HANDSHAKE_TO);
2629 if (rc <= 0) {
2630 tls_handshake_cancel(sk);
2631 if (rc == 0)
2632 rc = -ETIMEDOUT;
2633 goto out_put_xprt;
2634 }
2635
2636 rc = lower_transport->xprt_err;
2637
2638out:
2639 xs_stream_reset_connect(lower_transport);
2640 clear_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2641 return rc;
2642
2643out_put_xprt:
2644 xprt_put(lower_xprt);
2645 goto out;
2646}
2647
2648/**
2649 * xs_tcp_tls_setup_socket - establish a TLS session on a TCP socket
2650 * @work: queued work item
2651 *
2652 * Invoked by a work queue tasklet.
2653 *
2654 * For RPC-with-TLS, there is a two-stage connection process.
2655 *
2656 * The "upper-layer xprt" is visible to the RPC consumer. Once it has
2657 * been marked connected, the consumer knows that a TCP connection and
2658 * a TLS session have been established.
2659 *
2660 * A "lower-layer xprt", created in this function, handles the mechanics
2661 * of connecting the TCP socket, performing the RPC_AUTH_TLS probe, and
2662 * then driving the TLS handshake. Once all that is complete, the upper
2663 * layer xprt is marked connected.
2664 */
2665static void xs_tcp_tls_setup_socket(struct work_struct *work)
2666{
2667 struct sock_xprt *upper_transport =
2668 container_of(work, struct sock_xprt, connect_worker.work);
2669 struct rpc_clnt *upper_clnt = upper_transport->clnt;
2670 struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2671 struct rpc_create_args args = {
2672 .net = upper_xprt->xprt_net,
2673 .protocol = upper_xprt->prot,
2674 .address = (struct sockaddr *)&upper_xprt->addr,
2675 .addrsize = upper_xprt->addrlen,
2676 .timeout = upper_clnt->cl_timeout,
2677 .servername = upper_xprt->servername,
2678 .program = upper_clnt->cl_program,
2679 .prognumber = upper_clnt->cl_prog,
2680 .version = upper_clnt->cl_vers,
2681 .authflavor = RPC_AUTH_TLS,
2682 .cred = upper_clnt->cl_cred,
2683 .xprtsec = {
2684 .policy = RPC_XPRTSEC_NONE,
2685 },
2686 .stats = upper_clnt->cl_stats,
2687 };
2688 unsigned int pflags = current->flags;
2689 struct rpc_clnt *lower_clnt;
2690 struct rpc_xprt *lower_xprt;
2691 int status;
2692
2693 if (atomic_read(&upper_xprt->swapper))
2694 current->flags |= PF_MEMALLOC;
2695
2696 xs_stream_start_connect(upper_transport);
2697
2698 /* This implicitly sends an RPC_AUTH_TLS probe */
2699 lower_clnt = rpc_create(&args);
2700 if (IS_ERR(lower_clnt)) {
2701 trace_rpc_tls_unavailable(upper_clnt, upper_xprt);
2702 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2703 xprt_clear_connecting(upper_xprt);
2704 xprt_wake_pending_tasks(upper_xprt, PTR_ERR(lower_clnt));
2705 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2706 goto out_unlock;
2707 }
2708
2709 /* RPC_AUTH_TLS probe was successful. Try a TLS handshake on
2710 * the lower xprt.
2711 */
2712 rcu_read_lock();
2713 lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
2714 rcu_read_unlock();
2715
2716 if (wait_on_bit_lock(&lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2717 goto out_unlock;
2718
2719 status = xs_tls_handshake_sync(lower_xprt, &upper_xprt->xprtsec);
2720 if (status) {
2721 trace_rpc_tls_not_started(upper_clnt, upper_xprt);
2722 goto out_close;
2723 }
2724
2725 status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
2726 if (status)
2727 goto out_close;
2728 xprt_release_write(lower_xprt, NULL);
2729 trace_rpc_socket_connect(upper_xprt, upper_transport->sock, 0);
2730 rpc_shutdown_client(lower_clnt);
2731
2732 /* Check for ingress data that arrived before the socket's
2733 * ->data_ready callback was set up.
2734 */
2735 xs_poll_check_readable(upper_transport);
2736
2737out_unlock:
2738 current_restore_flags(pflags, PF_MEMALLOC);
2739 upper_transport->clnt = NULL;
2740 xprt_unlock_connect(upper_xprt, upper_transport);
2741 return;
2742
2743out_close:
2744 xprt_release_write(lower_xprt, NULL);
2745 rpc_shutdown_client(lower_clnt);
2746
2747 /* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2748 * Wake them first here to ensure they get our tk_status code.
2749 */
2750 xprt_wake_pending_tasks(upper_xprt, status);
2751 xs_tcp_force_close(upper_xprt);
2752 xprt_clear_connecting(upper_xprt);
2753 goto out_unlock;
2754}
2755
2756/**
2757 * xs_connect - connect a socket to a remote endpoint
2758 * @xprt: pointer to transport structure
2759 * @task: address of RPC task that manages state of connect request
2760 *
2761 * TCP: If the remote end dropped the connection, delay reconnecting.
2762 *
2763 * UDP socket connects are synchronous, but we use a work queue anyway
2764 * to guarantee that even unprivileged user processes can set up a
2765 * socket on a privileged port.
2766 *
2767 * If a UDP socket connect fails, the delay behavior here prevents
2768 * retry floods (hard mounts).
2769 */
2770static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2771{
2772 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2773 unsigned long delay = 0;
2774
2775 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2776
2777 if (transport->sock != NULL) {
2778 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2779 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2780
2781 delay = xprt_reconnect_delay(xprt);
2782 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2783
2784 } else
2785 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2786
2787 transport->clnt = task->tk_client;
2788 queue_delayed_work(xprtiod_workqueue,
2789 &transport->connect_worker,
2790 delay);
2791}
2792
2793static void xs_wake_disconnect(struct sock_xprt *transport)
2794{
2795 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2796 xs_tcp_force_close(&transport->xprt);
2797}
2798
2799static void xs_wake_write(struct sock_xprt *transport)
2800{
2801 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2802 xprt_write_space(&transport->xprt);
2803}
2804
2805static void xs_wake_error(struct sock_xprt *transport)
2806{
2807 int sockerr;
2808
2809 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2810 return;
2811 sockerr = xchg(&transport->xprt_err, 0);
2812 if (sockerr < 0) {
2813 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2814 xs_tcp_force_close(&transport->xprt);
2815 }
2816}
2817
2818static void xs_wake_pending(struct sock_xprt *transport)
2819{
2820 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2821 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2822}
2823
2824static void xs_error_handle(struct work_struct *work)
2825{
2826 struct sock_xprt *transport = container_of(work,
2827 struct sock_xprt, error_worker);
2828
2829 xs_wake_disconnect(transport);
2830 xs_wake_write(transport);
2831 xs_wake_error(transport);
2832 xs_wake_pending(transport);
2833}
2834
2835/**
2836 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2837 * @xprt: rpc_xprt struct containing statistics
2838 * @seq: output file
2839 *
2840 */
2841static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2842{
2843 long idle_time = 0;
2844
2845 if (xprt_connected(xprt))
2846 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2847
2848 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2849 "%llu %llu %lu %llu %llu\n",
2850 xprt->stat.bind_count,
2851 xprt->stat.connect_count,
2852 xprt->stat.connect_time / HZ,
2853 idle_time,
2854 xprt->stat.sends,
2855 xprt->stat.recvs,
2856 xprt->stat.bad_xids,
2857 xprt->stat.req_u,
2858 xprt->stat.bklog_u,
2859 xprt->stat.max_slots,
2860 xprt->stat.sending_u,
2861 xprt->stat.pending_u);
2862}
2863
2864/**
2865 * xs_udp_print_stats - display UDP socket-specific stats
2866 * @xprt: rpc_xprt struct containing statistics
2867 * @seq: output file
2868 *
2869 */
2870static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2871{
2872 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2873
2874 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2875 "%lu %llu %llu\n",
2876 transport->srcport,
2877 xprt->stat.bind_count,
2878 xprt->stat.sends,
2879 xprt->stat.recvs,
2880 xprt->stat.bad_xids,
2881 xprt->stat.req_u,
2882 xprt->stat.bklog_u,
2883 xprt->stat.max_slots,
2884 xprt->stat.sending_u,
2885 xprt->stat.pending_u);
2886}
2887
2888/**
2889 * xs_tcp_print_stats - display TCP socket-specific stats
2890 * @xprt: rpc_xprt struct containing statistics
2891 * @seq: output file
2892 *
2893 */
2894static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2895{
2896 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2897 long idle_time = 0;
2898
2899 if (xprt_connected(xprt))
2900 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2901
2902 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2903 "%llu %llu %lu %llu %llu\n",
2904 transport->srcport,
2905 xprt->stat.bind_count,
2906 xprt->stat.connect_count,
2907 xprt->stat.connect_time / HZ,
2908 idle_time,
2909 xprt->stat.sends,
2910 xprt->stat.recvs,
2911 xprt->stat.bad_xids,
2912 xprt->stat.req_u,
2913 xprt->stat.bklog_u,
2914 xprt->stat.max_slots,
2915 xprt->stat.sending_u,
2916 xprt->stat.pending_u);
2917}
2918
2919/*
2920 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2921 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2922 * to use the server side send routines.
2923 */
2924static int bc_malloc(struct rpc_task *task)
2925{
2926 struct rpc_rqst *rqst = task->tk_rqstp;
2927 size_t size = rqst->rq_callsize;
2928 struct page *page;
2929 struct rpc_buffer *buf;
2930
2931 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2932 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2933 size);
2934 return -EINVAL;
2935 }
2936
2937 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2938 if (!page)
2939 return -ENOMEM;
2940
2941 buf = page_address(page);
2942 buf->len = PAGE_SIZE;
2943
2944 rqst->rq_buffer = buf->data;
2945 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2946 return 0;
2947}
2948
2949/*
2950 * Free the space allocated in the bc_alloc routine
2951 */
2952static void bc_free(struct rpc_task *task)
2953{
2954 void *buffer = task->tk_rqstp->rq_buffer;
2955 struct rpc_buffer *buf;
2956
2957 buf = container_of(buffer, struct rpc_buffer, data);
2958 free_page((unsigned long)buf);
2959}
2960
2961static int bc_sendto(struct rpc_rqst *req)
2962{
2963 struct xdr_buf *xdr = &req->rq_snd_buf;
2964 struct sock_xprt *transport =
2965 container_of(req->rq_xprt, struct sock_xprt, xprt);
2966 struct msghdr msg = {
2967 .msg_flags = 0,
2968 };
2969 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2970 (u32)xdr->len);
2971 unsigned int sent = 0;
2972 int err;
2973
2974 req->rq_xtime = ktime_get();
2975 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2976 if (err < 0)
2977 return err;
2978 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2979 xdr_free_bvec(xdr);
2980 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2981 return -EAGAIN;
2982 return sent;
2983}
2984
2985/**
2986 * bc_send_request - Send a backchannel Call on a TCP socket
2987 * @req: rpc_rqst containing Call message to be sent
2988 *
2989 * xpt_mutex ensures @rqstp's whole message is written to the socket
2990 * without interruption.
2991 *
2992 * Return values:
2993 * %0 if the message was sent successfully
2994 * %ENOTCONN if the message was not sent
2995 */
2996static int bc_send_request(struct rpc_rqst *req)
2997{
2998 struct svc_xprt *xprt;
2999 int len;
3000
3001 /*
3002 * Get the server socket associated with this callback xprt
3003 */
3004 xprt = req->rq_xprt->bc_xprt;
3005
3006 /*
3007 * Grab the mutex to serialize data as the connection is shared
3008 * with the fore channel
3009 */
3010 mutex_lock(&xprt->xpt_mutex);
3011 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
3012 len = -ENOTCONN;
3013 else
3014 len = bc_sendto(req);
3015 mutex_unlock(&xprt->xpt_mutex);
3016
3017 if (len > 0)
3018 len = 0;
3019
3020 return len;
3021}
3022
3023static void bc_close(struct rpc_xprt *xprt)
3024{
3025 xprt_disconnect_done(xprt);
3026}
3027
3028static void bc_destroy(struct rpc_xprt *xprt)
3029{
3030 dprintk("RPC: bc_destroy xprt %p\n", xprt);
3031
3032 xs_xprt_free(xprt);
3033 module_put(THIS_MODULE);
3034}
3035
3036static const struct rpc_xprt_ops xs_local_ops = {
3037 .reserve_xprt = xprt_reserve_xprt,
3038 .release_xprt = xprt_release_xprt,
3039 .alloc_slot = xprt_alloc_slot,
3040 .free_slot = xprt_free_slot,
3041 .rpcbind = xs_local_rpcbind,
3042 .set_port = xs_local_set_port,
3043 .connect = xs_local_connect,
3044 .buf_alloc = rpc_malloc,
3045 .buf_free = rpc_free,
3046 .prepare_request = xs_stream_prepare_request,
3047 .send_request = xs_local_send_request,
3048 .abort_send_request = xs_stream_abort_send_request,
3049 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3050 .close = xs_close,
3051 .destroy = xs_destroy,
3052 .print_stats = xs_local_print_stats,
3053 .enable_swap = xs_enable_swap,
3054 .disable_swap = xs_disable_swap,
3055};
3056
3057static const struct rpc_xprt_ops xs_udp_ops = {
3058 .set_buffer_size = xs_udp_set_buffer_size,
3059 .reserve_xprt = xprt_reserve_xprt_cong,
3060 .release_xprt = xprt_release_xprt_cong,
3061 .alloc_slot = xprt_alloc_slot,
3062 .free_slot = xprt_free_slot,
3063 .rpcbind = rpcb_getport_async,
3064 .set_port = xs_set_port,
3065 .connect = xs_connect,
3066 .get_srcaddr = xs_sock_srcaddr,
3067 .get_srcport = xs_sock_srcport,
3068 .buf_alloc = rpc_malloc,
3069 .buf_free = rpc_free,
3070 .send_request = xs_udp_send_request,
3071 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3072 .timer = xs_udp_timer,
3073 .release_request = xprt_release_rqst_cong,
3074 .close = xs_close,
3075 .destroy = xs_destroy,
3076 .print_stats = xs_udp_print_stats,
3077 .enable_swap = xs_enable_swap,
3078 .disable_swap = xs_disable_swap,
3079 .inject_disconnect = xs_inject_disconnect,
3080};
3081
3082static const struct rpc_xprt_ops xs_tcp_ops = {
3083 .reserve_xprt = xprt_reserve_xprt,
3084 .release_xprt = xprt_release_xprt,
3085 .alloc_slot = xprt_alloc_slot,
3086 .free_slot = xprt_free_slot,
3087 .rpcbind = rpcb_getport_async,
3088 .set_port = xs_set_port,
3089 .connect = xs_connect,
3090 .get_srcaddr = xs_sock_srcaddr,
3091 .get_srcport = xs_sock_srcport,
3092 .buf_alloc = rpc_malloc,
3093 .buf_free = rpc_free,
3094 .prepare_request = xs_stream_prepare_request,
3095 .send_request = xs_tcp_send_request,
3096 .abort_send_request = xs_stream_abort_send_request,
3097 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3098 .close = xs_tcp_shutdown,
3099 .destroy = xs_destroy,
3100 .set_connect_timeout = xs_tcp_set_connect_timeout,
3101 .print_stats = xs_tcp_print_stats,
3102 .enable_swap = xs_enable_swap,
3103 .disable_swap = xs_disable_swap,
3104 .inject_disconnect = xs_inject_disconnect,
3105#ifdef CONFIG_SUNRPC_BACKCHANNEL
3106 .bc_setup = xprt_setup_bc,
3107 .bc_maxpayload = xs_tcp_bc_maxpayload,
3108 .bc_num_slots = xprt_bc_max_slots,
3109 .bc_free_rqst = xprt_free_bc_rqst,
3110 .bc_destroy = xprt_destroy_bc,
3111#endif
3112};
3113
3114/*
3115 * The rpc_xprt_ops for the server backchannel
3116 */
3117
3118static const struct rpc_xprt_ops bc_tcp_ops = {
3119 .reserve_xprt = xprt_reserve_xprt,
3120 .release_xprt = xprt_release_xprt,
3121 .alloc_slot = xprt_alloc_slot,
3122 .free_slot = xprt_free_slot,
3123 .buf_alloc = bc_malloc,
3124 .buf_free = bc_free,
3125 .send_request = bc_send_request,
3126 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3127 .close = bc_close,
3128 .destroy = bc_destroy,
3129 .print_stats = xs_tcp_print_stats,
3130 .enable_swap = xs_enable_swap,
3131 .disable_swap = xs_disable_swap,
3132 .inject_disconnect = xs_inject_disconnect,
3133};
3134
3135static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3136{
3137 static const struct sockaddr_in sin = {
3138 .sin_family = AF_INET,
3139 .sin_addr.s_addr = htonl(INADDR_ANY),
3140 };
3141 static const struct sockaddr_in6 sin6 = {
3142 .sin6_family = AF_INET6,
3143 .sin6_addr = IN6ADDR_ANY_INIT,
3144 };
3145
3146 switch (family) {
3147 case AF_LOCAL:
3148 break;
3149 case AF_INET:
3150 memcpy(sap, &sin, sizeof(sin));
3151 break;
3152 case AF_INET6:
3153 memcpy(sap, &sin6, sizeof(sin6));
3154 break;
3155 default:
3156 dprintk("RPC: %s: Bad address family\n", __func__);
3157 return -EAFNOSUPPORT;
3158 }
3159 return 0;
3160}
3161
3162static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3163 unsigned int slot_table_size,
3164 unsigned int max_slot_table_size)
3165{
3166 struct rpc_xprt *xprt;
3167 struct sock_xprt *new;
3168
3169 if (args->addrlen > sizeof(xprt->addr)) {
3170 dprintk("RPC: xs_setup_xprt: address too large\n");
3171 return ERR_PTR(-EBADF);
3172 }
3173
3174 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
3175 max_slot_table_size);
3176 if (xprt == NULL) {
3177 dprintk("RPC: xs_setup_xprt: couldn't allocate "
3178 "rpc_xprt\n");
3179 return ERR_PTR(-ENOMEM);
3180 }
3181
3182 new = container_of(xprt, struct sock_xprt, xprt);
3183 mutex_init(&new->recv_mutex);
3184 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3185 xprt->addrlen = args->addrlen;
3186 if (args->srcaddr)
3187 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3188 else {
3189 int err;
3190 err = xs_init_anyaddr(args->dstaddr->sa_family,
3191 (struct sockaddr *)&new->srcaddr);
3192 if (err != 0) {
3193 xprt_free(xprt);
3194 return ERR_PTR(err);
3195 }
3196 }
3197
3198 return xprt;
3199}
3200
3201static const struct rpc_timeout xs_local_default_timeout = {
3202 .to_initval = 10 * HZ,
3203 .to_maxval = 10 * HZ,
3204 .to_retries = 2,
3205};
3206
3207/**
3208 * xs_setup_local - Set up transport to use an AF_LOCAL socket
3209 * @args: rpc transport creation arguments
3210 *
3211 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3212 */
3213static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3214{
3215 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3216 struct sock_xprt *transport;
3217 struct rpc_xprt *xprt;
3218 struct rpc_xprt *ret;
3219
3220 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3221 xprt_max_tcp_slot_table_entries);
3222 if (IS_ERR(xprt))
3223 return xprt;
3224 transport = container_of(xprt, struct sock_xprt, xprt);
3225
3226 xprt->prot = 0;
3227 xprt->xprt_class = &xs_local_transport;
3228 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3229
3230 xprt->bind_timeout = XS_BIND_TO;
3231 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3232 xprt->idle_timeout = XS_IDLE_DISC_TO;
3233
3234 xprt->ops = &xs_local_ops;
3235 xprt->timeout = &xs_local_default_timeout;
3236
3237 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3238 INIT_WORK(&transport->error_worker, xs_error_handle);
3239 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3240
3241 switch (sun->sun_family) {
3242 case AF_LOCAL:
3243 if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3244 dprintk("RPC: bad AF_LOCAL address: %s\n",
3245 sun->sun_path);
3246 ret = ERR_PTR(-EINVAL);
3247 goto out_err;
3248 }
3249 xprt_set_bound(xprt);
3250 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
3251 break;
3252 default:
3253 ret = ERR_PTR(-EAFNOSUPPORT);
3254 goto out_err;
3255 }
3256
3257 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
3258 xprt->address_strings[RPC_DISPLAY_ADDR]);
3259
3260 if (try_module_get(THIS_MODULE))
3261 return xprt;
3262 ret = ERR_PTR(-EINVAL);
3263out_err:
3264 xs_xprt_free(xprt);
3265 return ret;
3266}
3267
3268static const struct rpc_timeout xs_udp_default_timeout = {
3269 .to_initval = 5 * HZ,
3270 .to_maxval = 30 * HZ,
3271 .to_increment = 5 * HZ,
3272 .to_retries = 5,
3273};
3274
3275/**
3276 * xs_setup_udp - Set up transport to use a UDP socket
3277 * @args: rpc transport creation arguments
3278 *
3279 */
3280static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3281{
3282 struct sockaddr *addr = args->dstaddr;
3283 struct rpc_xprt *xprt;
3284 struct sock_xprt *transport;
3285 struct rpc_xprt *ret;
3286
3287 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3288 xprt_udp_slot_table_entries);
3289 if (IS_ERR(xprt))
3290 return xprt;
3291 transport = container_of(xprt, struct sock_xprt, xprt);
3292
3293 xprt->prot = IPPROTO_UDP;
3294 xprt->xprt_class = &xs_udp_transport;
3295 /* XXX: header size can vary due to auth type, IPv6, etc. */
3296 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3297
3298 xprt->bind_timeout = XS_BIND_TO;
3299 xprt->reestablish_timeout = XS_UDP_REEST_TO;
3300 xprt->idle_timeout = XS_IDLE_DISC_TO;
3301
3302 xprt->ops = &xs_udp_ops;
3303
3304 xprt->timeout = &xs_udp_default_timeout;
3305
3306 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3307 INIT_WORK(&transport->error_worker, xs_error_handle);
3308 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3309
3310 switch (addr->sa_family) {
3311 case AF_INET:
3312 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3313 xprt_set_bound(xprt);
3314
3315 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3316 break;
3317 case AF_INET6:
3318 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3319 xprt_set_bound(xprt);
3320
3321 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3322 break;
3323 default:
3324 ret = ERR_PTR(-EAFNOSUPPORT);
3325 goto out_err;
3326 }
3327
3328 if (xprt_bound(xprt))
3329 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3330 xprt->address_strings[RPC_DISPLAY_ADDR],
3331 xprt->address_strings[RPC_DISPLAY_PORT],
3332 xprt->address_strings[RPC_DISPLAY_PROTO]);
3333 else
3334 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3335 xprt->address_strings[RPC_DISPLAY_ADDR],
3336 xprt->address_strings[RPC_DISPLAY_PROTO]);
3337
3338 if (try_module_get(THIS_MODULE))
3339 return xprt;
3340 ret = ERR_PTR(-EINVAL);
3341out_err:
3342 xs_xprt_free(xprt);
3343 return ret;
3344}
3345
3346static const struct rpc_timeout xs_tcp_default_timeout = {
3347 .to_initval = 60 * HZ,
3348 .to_maxval = 60 * HZ,
3349 .to_retries = 2,
3350};
3351
3352/**
3353 * xs_setup_tcp - Set up transport to use a TCP socket
3354 * @args: rpc transport creation arguments
3355 *
3356 */
3357static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3358{
3359 struct sockaddr *addr = args->dstaddr;
3360 struct rpc_xprt *xprt;
3361 struct sock_xprt *transport;
3362 struct rpc_xprt *ret;
3363 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3364
3365 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3366 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3367
3368 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3369 max_slot_table_size);
3370 if (IS_ERR(xprt))
3371 return xprt;
3372 transport = container_of(xprt, struct sock_xprt, xprt);
3373
3374 xprt->prot = IPPROTO_TCP;
3375 xprt->xprt_class = &xs_tcp_transport;
3376 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3377
3378 xprt->bind_timeout = XS_BIND_TO;
3379 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3380 xprt->idle_timeout = XS_IDLE_DISC_TO;
3381
3382 xprt->ops = &xs_tcp_ops;
3383 xprt->timeout = &xs_tcp_default_timeout;
3384
3385 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3386 if (args->reconnect_timeout)
3387 xprt->max_reconnect_timeout = args->reconnect_timeout;
3388
3389 xprt->connect_timeout = xprt->timeout->to_initval *
3390 (xprt->timeout->to_retries + 1);
3391 if (args->connect_timeout)
3392 xs_tcp_do_set_connect_timeout(xprt, args->connect_timeout);
3393
3394 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3395 INIT_WORK(&transport->error_worker, xs_error_handle);
3396 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3397
3398 switch (addr->sa_family) {
3399 case AF_INET:
3400 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3401 xprt_set_bound(xprt);
3402
3403 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3404 break;
3405 case AF_INET6:
3406 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3407 xprt_set_bound(xprt);
3408
3409 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3410 break;
3411 default:
3412 ret = ERR_PTR(-EAFNOSUPPORT);
3413 goto out_err;
3414 }
3415
3416 if (xprt_bound(xprt))
3417 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3418 xprt->address_strings[RPC_DISPLAY_ADDR],
3419 xprt->address_strings[RPC_DISPLAY_PORT],
3420 xprt->address_strings[RPC_DISPLAY_PROTO]);
3421 else
3422 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3423 xprt->address_strings[RPC_DISPLAY_ADDR],
3424 xprt->address_strings[RPC_DISPLAY_PROTO]);
3425
3426 if (try_module_get(THIS_MODULE))
3427 return xprt;
3428 ret = ERR_PTR(-EINVAL);
3429out_err:
3430 xs_xprt_free(xprt);
3431 return ret;
3432}
3433
3434/**
3435 * xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3436 * @args: rpc transport creation arguments
3437 *
3438 */
3439static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3440{
3441 struct sockaddr *addr = args->dstaddr;
3442 struct rpc_xprt *xprt;
3443 struct sock_xprt *transport;
3444 struct rpc_xprt *ret;
3445 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3446
3447 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3448 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3449
3450 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3451 max_slot_table_size);
3452 if (IS_ERR(xprt))
3453 return xprt;
3454 transport = container_of(xprt, struct sock_xprt, xprt);
3455
3456 xprt->prot = IPPROTO_TCP;
3457 xprt->xprt_class = &xs_tcp_transport;
3458 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3459
3460 xprt->bind_timeout = XS_BIND_TO;
3461 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3462 xprt->idle_timeout = XS_IDLE_DISC_TO;
3463
3464 xprt->ops = &xs_tcp_ops;
3465 xprt->timeout = &xs_tcp_default_timeout;
3466
3467 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3468 xprt->connect_timeout = xprt->timeout->to_initval *
3469 (xprt->timeout->to_retries + 1);
3470
3471 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3472 INIT_WORK(&transport->error_worker, xs_error_handle);
3473
3474 switch (args->xprtsec.policy) {
3475 case RPC_XPRTSEC_TLS_ANON:
3476 case RPC_XPRTSEC_TLS_X509:
3477 xprt->xprtsec = args->xprtsec;
3478 INIT_DELAYED_WORK(&transport->connect_worker,
3479 xs_tcp_tls_setup_socket);
3480 break;
3481 default:
3482 ret = ERR_PTR(-EACCES);
3483 goto out_err;
3484 }
3485
3486 switch (addr->sa_family) {
3487 case AF_INET:
3488 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3489 xprt_set_bound(xprt);
3490
3491 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3492 break;
3493 case AF_INET6:
3494 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3495 xprt_set_bound(xprt);
3496
3497 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3498 break;
3499 default:
3500 ret = ERR_PTR(-EAFNOSUPPORT);
3501 goto out_err;
3502 }
3503
3504 if (xprt_bound(xprt))
3505 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3506 xprt->address_strings[RPC_DISPLAY_ADDR],
3507 xprt->address_strings[RPC_DISPLAY_PORT],
3508 xprt->address_strings[RPC_DISPLAY_PROTO]);
3509 else
3510 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3511 xprt->address_strings[RPC_DISPLAY_ADDR],
3512 xprt->address_strings[RPC_DISPLAY_PROTO]);
3513
3514 if (try_module_get(THIS_MODULE))
3515 return xprt;
3516 ret = ERR_PTR(-EINVAL);
3517out_err:
3518 xs_xprt_free(xprt);
3519 return ret;
3520}
3521
3522/**
3523 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3524 * @args: rpc transport creation arguments
3525 *
3526 */
3527static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3528{
3529 struct sockaddr *addr = args->dstaddr;
3530 struct rpc_xprt *xprt;
3531 struct sock_xprt *transport;
3532 struct svc_sock *bc_sock;
3533 struct rpc_xprt *ret;
3534
3535 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3536 xprt_tcp_slot_table_entries);
3537 if (IS_ERR(xprt))
3538 return xprt;
3539 transport = container_of(xprt, struct sock_xprt, xprt);
3540
3541 xprt->prot = IPPROTO_TCP;
3542 xprt->xprt_class = &xs_bc_tcp_transport;
3543 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3544 xprt->timeout = &xs_tcp_default_timeout;
3545
3546 /* backchannel */
3547 xprt_set_bound(xprt);
3548 xprt->bind_timeout = 0;
3549 xprt->reestablish_timeout = 0;
3550 xprt->idle_timeout = 0;
3551
3552 xprt->ops = &bc_tcp_ops;
3553
3554 switch (addr->sa_family) {
3555 case AF_INET:
3556 xs_format_peer_addresses(xprt, "tcp",
3557 RPCBIND_NETID_TCP);
3558 break;
3559 case AF_INET6:
3560 xs_format_peer_addresses(xprt, "tcp",
3561 RPCBIND_NETID_TCP6);
3562 break;
3563 default:
3564 ret = ERR_PTR(-EAFNOSUPPORT);
3565 goto out_err;
3566 }
3567
3568 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3569 xprt->address_strings[RPC_DISPLAY_ADDR],
3570 xprt->address_strings[RPC_DISPLAY_PORT],
3571 xprt->address_strings[RPC_DISPLAY_PROTO]);
3572
3573 /*
3574 * Once we've associated a backchannel xprt with a connection,
3575 * we want to keep it around as long as the connection lasts,
3576 * in case we need to start using it for a backchannel again;
3577 * this reference won't be dropped until bc_xprt is destroyed.
3578 */
3579 xprt_get(xprt);
3580 args->bc_xprt->xpt_bc_xprt = xprt;
3581 xprt->bc_xprt = args->bc_xprt;
3582 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3583 transport->sock = bc_sock->sk_sock;
3584 transport->inet = bc_sock->sk_sk;
3585
3586 /*
3587 * Since we don't want connections for the backchannel, we set
3588 * the xprt status to connected
3589 */
3590 xprt_set_connected(xprt);
3591
3592 if (try_module_get(THIS_MODULE))
3593 return xprt;
3594
3595 args->bc_xprt->xpt_bc_xprt = NULL;
3596 args->bc_xprt->xpt_bc_xps = NULL;
3597 xprt_put(xprt);
3598 ret = ERR_PTR(-EINVAL);
3599out_err:
3600 xs_xprt_free(xprt);
3601 return ret;
3602}
3603
3604static struct xprt_class xs_local_transport = {
3605 .list = LIST_HEAD_INIT(xs_local_transport.list),
3606 .name = "named UNIX socket",
3607 .owner = THIS_MODULE,
3608 .ident = XPRT_TRANSPORT_LOCAL,
3609 .setup = xs_setup_local,
3610 .netid = { "" },
3611};
3612
3613static struct xprt_class xs_udp_transport = {
3614 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3615 .name = "udp",
3616 .owner = THIS_MODULE,
3617 .ident = XPRT_TRANSPORT_UDP,
3618 .setup = xs_setup_udp,
3619 .netid = { "udp", "udp6", "" },
3620};
3621
3622static struct xprt_class xs_tcp_transport = {
3623 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3624 .name = "tcp",
3625 .owner = THIS_MODULE,
3626 .ident = XPRT_TRANSPORT_TCP,
3627 .setup = xs_setup_tcp,
3628 .netid = { "tcp", "tcp6", "" },
3629};
3630
3631static struct xprt_class xs_tcp_tls_transport = {
3632 .list = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3633 .name = "tcp-with-tls",
3634 .owner = THIS_MODULE,
3635 .ident = XPRT_TRANSPORT_TCP_TLS,
3636 .setup = xs_setup_tcp_tls,
3637 .netid = { "tcp", "tcp6", "" },
3638};
3639
3640static struct xprt_class xs_bc_tcp_transport = {
3641 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3642 .name = "tcp NFSv4.1 backchannel",
3643 .owner = THIS_MODULE,
3644 .ident = XPRT_TRANSPORT_BC_TCP,
3645 .setup = xs_setup_bc_tcp,
3646 .netid = { "" },
3647};
3648
3649/**
3650 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3651 *
3652 */
3653int init_socket_xprt(void)
3654{
3655 if (!sunrpc_table_header)
3656 sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3657
3658 xprt_register_transport(&xs_local_transport);
3659 xprt_register_transport(&xs_udp_transport);
3660 xprt_register_transport(&xs_tcp_transport);
3661 xprt_register_transport(&xs_tcp_tls_transport);
3662 xprt_register_transport(&xs_bc_tcp_transport);
3663
3664 return 0;
3665}
3666
3667/**
3668 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3669 *
3670 */
3671void cleanup_socket_xprt(void)
3672{
3673 if (sunrpc_table_header) {
3674 unregister_sysctl_table(sunrpc_table_header);
3675 sunrpc_table_header = NULL;
3676 }
3677
3678 xprt_unregister_transport(&xs_local_transport);
3679 xprt_unregister_transport(&xs_udp_transport);
3680 xprt_unregister_transport(&xs_tcp_transport);
3681 xprt_unregister_transport(&xs_tcp_tls_transport);
3682 xprt_unregister_transport(&xs_bc_tcp_transport);
3683}
3684
3685static int param_set_portnr(const char *val, const struct kernel_param *kp)
3686{
3687 return param_set_uint_minmax(val, kp,
3688 RPC_MIN_RESVPORT,
3689 RPC_MAX_RESVPORT);
3690}
3691
3692static const struct kernel_param_ops param_ops_portnr = {
3693 .set = param_set_portnr,
3694 .get = param_get_uint,
3695};
3696
3697#define param_check_portnr(name, p) \
3698 __param_check(name, p, unsigned int);
3699
3700module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3701module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3702
3703static int param_set_slot_table_size(const char *val,
3704 const struct kernel_param *kp)
3705{
3706 return param_set_uint_minmax(val, kp,
3707 RPC_MIN_SLOT_TABLE,
3708 RPC_MAX_SLOT_TABLE);
3709}
3710
3711static const struct kernel_param_ops param_ops_slot_table_size = {
3712 .set = param_set_slot_table_size,
3713 .get = param_get_uint,
3714};
3715
3716#define param_check_slot_table_size(name, p) \
3717 __param_check(name, p, unsigned int);
3718
3719static int param_set_max_slot_table_size(const char *val,
3720 const struct kernel_param *kp)
3721{
3722 return param_set_uint_minmax(val, kp,
3723 RPC_MIN_SLOT_TABLE,
3724 RPC_MAX_SLOT_TABLE_LIMIT);
3725}
3726
3727static const struct kernel_param_ops param_ops_max_slot_table_size = {
3728 .set = param_set_max_slot_table_size,
3729 .get = param_get_uint,
3730};
3731
3732#define param_check_max_slot_table_size(name, p) \
3733 __param_check(name, p, unsigned int);
3734
3735module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3736 slot_table_size, 0644);
3737module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3738 max_slot_table_size, 0644);
3739module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3740 slot_table_size, 0644);
Linux 6.x block layer and io_uring tree(s)