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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/net/sunrpc/xprtsock.c
4 *
5 * Client-side transport implementation for sockets.
6 *
7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
9 * TCP NFS related read + write fixes
10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 *
12 * Rewrite of larges part of the code in order to stabilize TCP stuff.
13 * Fix behaviour when socket buffer is full.
14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 *
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 *
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
20 */
21
22#include <linux/types.h>
23#include <linux/string.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/capability.h>
27#include <linux/pagemap.h>
28#include <linux/errno.h>
29#include <linux/socket.h>
30#include <linux/in.h>
31#include <linux/net.h>
32#include <linux/mm.h>
33#include <linux/un.h>
34#include <linux/udp.h>
35#include <linux/tcp.h>
36#include <linux/sunrpc/clnt.h>
37#include <linux/sunrpc/addr.h>
38#include <linux/sunrpc/sched.h>
39#include <linux/sunrpc/svcsock.h>
40#include <linux/sunrpc/xprtsock.h>
41#include <linux/file.h>
42#ifdef CONFIG_SUNRPC_BACKCHANNEL
43#include <linux/sunrpc/bc_xprt.h>
44#endif
45
46#include <net/sock.h>
47#include <net/checksum.h>
48#include <net/udp.h>
49#include <net/tcp.h>
50#include <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
2730 trace_rpc_socket_connect(upper_xprt, upper_transport->sock, 0);
2731 if (!xprt_test_and_set_connected(upper_xprt)) {
2732 upper_xprt->connect_cookie++;
2733 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2734 xprt_clear_connecting(upper_xprt);
2735
2736 upper_xprt->stat.connect_count++;
2737 upper_xprt->stat.connect_time += (long)jiffies -
2738 upper_xprt->stat.connect_start;
2739 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2740 }
2741 rpc_shutdown_client(lower_clnt);
2742
2743out_unlock:
2744 current_restore_flags(pflags, PF_MEMALLOC);
2745 upper_transport->clnt = NULL;
2746 xprt_unlock_connect(upper_xprt, upper_transport);
2747 return;
2748
2749out_close:
2750 xprt_release_write(lower_xprt, NULL);
2751 rpc_shutdown_client(lower_clnt);
2752
2753 /* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2754 * Wake them first here to ensure they get our tk_status code.
2755 */
2756 xprt_wake_pending_tasks(upper_xprt, status);
2757 xs_tcp_force_close(upper_xprt);
2758 xprt_clear_connecting(upper_xprt);
2759 goto out_unlock;
2760}
2761
2762/**
2763 * xs_connect - connect a socket to a remote endpoint
2764 * @xprt: pointer to transport structure
2765 * @task: address of RPC task that manages state of connect request
2766 *
2767 * TCP: If the remote end dropped the connection, delay reconnecting.
2768 *
2769 * UDP socket connects are synchronous, but we use a work queue anyway
2770 * to guarantee that even unprivileged user processes can set up a
2771 * socket on a privileged port.
2772 *
2773 * If a UDP socket connect fails, the delay behavior here prevents
2774 * retry floods (hard mounts).
2775 */
2776static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2777{
2778 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2779 unsigned long delay = 0;
2780
2781 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2782
2783 if (transport->sock != NULL) {
2784 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2785 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2786
2787 delay = xprt_reconnect_delay(xprt);
2788 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2789
2790 } else
2791 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2792
2793 transport->clnt = task->tk_client;
2794 queue_delayed_work(xprtiod_workqueue,
2795 &transport->connect_worker,
2796 delay);
2797}
2798
2799static void xs_wake_disconnect(struct sock_xprt *transport)
2800{
2801 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2802 xs_tcp_force_close(&transport->xprt);
2803}
2804
2805static void xs_wake_write(struct sock_xprt *transport)
2806{
2807 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2808 xprt_write_space(&transport->xprt);
2809}
2810
2811static void xs_wake_error(struct sock_xprt *transport)
2812{
2813 int sockerr;
2814
2815 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2816 return;
2817 sockerr = xchg(&transport->xprt_err, 0);
2818 if (sockerr < 0) {
2819 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2820 xs_tcp_force_close(&transport->xprt);
2821 }
2822}
2823
2824static void xs_wake_pending(struct sock_xprt *transport)
2825{
2826 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2827 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2828}
2829
2830static void xs_error_handle(struct work_struct *work)
2831{
2832 struct sock_xprt *transport = container_of(work,
2833 struct sock_xprt, error_worker);
2834
2835 xs_wake_disconnect(transport);
2836 xs_wake_write(transport);
2837 xs_wake_error(transport);
2838 xs_wake_pending(transport);
2839}
2840
2841/**
2842 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2843 * @xprt: rpc_xprt struct containing statistics
2844 * @seq: output file
2845 *
2846 */
2847static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2848{
2849 long idle_time = 0;
2850
2851 if (xprt_connected(xprt))
2852 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2853
2854 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2855 "%llu %llu %lu %llu %llu\n",
2856 xprt->stat.bind_count,
2857 xprt->stat.connect_count,
2858 xprt->stat.connect_time / HZ,
2859 idle_time,
2860 xprt->stat.sends,
2861 xprt->stat.recvs,
2862 xprt->stat.bad_xids,
2863 xprt->stat.req_u,
2864 xprt->stat.bklog_u,
2865 xprt->stat.max_slots,
2866 xprt->stat.sending_u,
2867 xprt->stat.pending_u);
2868}
2869
2870/**
2871 * xs_udp_print_stats - display UDP socket-specific stats
2872 * @xprt: rpc_xprt struct containing statistics
2873 * @seq: output file
2874 *
2875 */
2876static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2877{
2878 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2879
2880 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2881 "%lu %llu %llu\n",
2882 transport->srcport,
2883 xprt->stat.bind_count,
2884 xprt->stat.sends,
2885 xprt->stat.recvs,
2886 xprt->stat.bad_xids,
2887 xprt->stat.req_u,
2888 xprt->stat.bklog_u,
2889 xprt->stat.max_slots,
2890 xprt->stat.sending_u,
2891 xprt->stat.pending_u);
2892}
2893
2894/**
2895 * xs_tcp_print_stats - display TCP socket-specific stats
2896 * @xprt: rpc_xprt struct containing statistics
2897 * @seq: output file
2898 *
2899 */
2900static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2901{
2902 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2903 long idle_time = 0;
2904
2905 if (xprt_connected(xprt))
2906 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2907
2908 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2909 "%llu %llu %lu %llu %llu\n",
2910 transport->srcport,
2911 xprt->stat.bind_count,
2912 xprt->stat.connect_count,
2913 xprt->stat.connect_time / HZ,
2914 idle_time,
2915 xprt->stat.sends,
2916 xprt->stat.recvs,
2917 xprt->stat.bad_xids,
2918 xprt->stat.req_u,
2919 xprt->stat.bklog_u,
2920 xprt->stat.max_slots,
2921 xprt->stat.sending_u,
2922 xprt->stat.pending_u);
2923}
2924
2925/*
2926 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2927 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2928 * to use the server side send routines.
2929 */
2930static int bc_malloc(struct rpc_task *task)
2931{
2932 struct rpc_rqst *rqst = task->tk_rqstp;
2933 size_t size = rqst->rq_callsize;
2934 struct page *page;
2935 struct rpc_buffer *buf;
2936
2937 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2938 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2939 size);
2940 return -EINVAL;
2941 }
2942
2943 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2944 if (!page)
2945 return -ENOMEM;
2946
2947 buf = page_address(page);
2948 buf->len = PAGE_SIZE;
2949
2950 rqst->rq_buffer = buf->data;
2951 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2952 return 0;
2953}
2954
2955/*
2956 * Free the space allocated in the bc_alloc routine
2957 */
2958static void bc_free(struct rpc_task *task)
2959{
2960 void *buffer = task->tk_rqstp->rq_buffer;
2961 struct rpc_buffer *buf;
2962
2963 buf = container_of(buffer, struct rpc_buffer, data);
2964 free_page((unsigned long)buf);
2965}
2966
2967static int bc_sendto(struct rpc_rqst *req)
2968{
2969 struct xdr_buf *xdr = &req->rq_snd_buf;
2970 struct sock_xprt *transport =
2971 container_of(req->rq_xprt, struct sock_xprt, xprt);
2972 struct msghdr msg = {
2973 .msg_flags = 0,
2974 };
2975 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2976 (u32)xdr->len);
2977 unsigned int sent = 0;
2978 int err;
2979
2980 req->rq_xtime = ktime_get();
2981 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2982 if (err < 0)
2983 return err;
2984 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2985 xdr_free_bvec(xdr);
2986 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2987 return -EAGAIN;
2988 return sent;
2989}
2990
2991/**
2992 * bc_send_request - Send a backchannel Call on a TCP socket
2993 * @req: rpc_rqst containing Call message to be sent
2994 *
2995 * xpt_mutex ensures @rqstp's whole message is written to the socket
2996 * without interruption.
2997 *
2998 * Return values:
2999 * %0 if the message was sent successfully
3000 * %ENOTCONN if the message was not sent
3001 */
3002static int bc_send_request(struct rpc_rqst *req)
3003{
3004 struct svc_xprt *xprt;
3005 int len;
3006
3007 /*
3008 * Get the server socket associated with this callback xprt
3009 */
3010 xprt = req->rq_xprt->bc_xprt;
3011
3012 /*
3013 * Grab the mutex to serialize data as the connection is shared
3014 * with the fore channel
3015 */
3016 mutex_lock(&xprt->xpt_mutex);
3017 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
3018 len = -ENOTCONN;
3019 else
3020 len = bc_sendto(req);
3021 mutex_unlock(&xprt->xpt_mutex);
3022
3023 if (len > 0)
3024 len = 0;
3025
3026 return len;
3027}
3028
3029static void bc_close(struct rpc_xprt *xprt)
3030{
3031 xprt_disconnect_done(xprt);
3032}
3033
3034static void bc_destroy(struct rpc_xprt *xprt)
3035{
3036 dprintk("RPC: bc_destroy xprt %p\n", xprt);
3037
3038 xs_xprt_free(xprt);
3039 module_put(THIS_MODULE);
3040}
3041
3042static const struct rpc_xprt_ops xs_local_ops = {
3043 .reserve_xprt = xprt_reserve_xprt,
3044 .release_xprt = xprt_release_xprt,
3045 .alloc_slot = xprt_alloc_slot,
3046 .free_slot = xprt_free_slot,
3047 .rpcbind = xs_local_rpcbind,
3048 .set_port = xs_local_set_port,
3049 .connect = xs_local_connect,
3050 .buf_alloc = rpc_malloc,
3051 .buf_free = rpc_free,
3052 .prepare_request = xs_stream_prepare_request,
3053 .send_request = xs_local_send_request,
3054 .abort_send_request = xs_stream_abort_send_request,
3055 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3056 .close = xs_close,
3057 .destroy = xs_destroy,
3058 .print_stats = xs_local_print_stats,
3059 .enable_swap = xs_enable_swap,
3060 .disable_swap = xs_disable_swap,
3061};
3062
3063static const struct rpc_xprt_ops xs_udp_ops = {
3064 .set_buffer_size = xs_udp_set_buffer_size,
3065 .reserve_xprt = xprt_reserve_xprt_cong,
3066 .release_xprt = xprt_release_xprt_cong,
3067 .alloc_slot = xprt_alloc_slot,
3068 .free_slot = xprt_free_slot,
3069 .rpcbind = rpcb_getport_async,
3070 .set_port = xs_set_port,
3071 .connect = xs_connect,
3072 .get_srcaddr = xs_sock_srcaddr,
3073 .get_srcport = xs_sock_srcport,
3074 .buf_alloc = rpc_malloc,
3075 .buf_free = rpc_free,
3076 .send_request = xs_udp_send_request,
3077 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3078 .timer = xs_udp_timer,
3079 .release_request = xprt_release_rqst_cong,
3080 .close = xs_close,
3081 .destroy = xs_destroy,
3082 .print_stats = xs_udp_print_stats,
3083 .enable_swap = xs_enable_swap,
3084 .disable_swap = xs_disable_swap,
3085 .inject_disconnect = xs_inject_disconnect,
3086};
3087
3088static const struct rpc_xprt_ops xs_tcp_ops = {
3089 .reserve_xprt = xprt_reserve_xprt,
3090 .release_xprt = xprt_release_xprt,
3091 .alloc_slot = xprt_alloc_slot,
3092 .free_slot = xprt_free_slot,
3093 .rpcbind = rpcb_getport_async,
3094 .set_port = xs_set_port,
3095 .connect = xs_connect,
3096 .get_srcaddr = xs_sock_srcaddr,
3097 .get_srcport = xs_sock_srcport,
3098 .buf_alloc = rpc_malloc,
3099 .buf_free = rpc_free,
3100 .prepare_request = xs_stream_prepare_request,
3101 .send_request = xs_tcp_send_request,
3102 .abort_send_request = xs_stream_abort_send_request,
3103 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3104 .close = xs_tcp_shutdown,
3105 .destroy = xs_destroy,
3106 .set_connect_timeout = xs_tcp_set_connect_timeout,
3107 .print_stats = xs_tcp_print_stats,
3108 .enable_swap = xs_enable_swap,
3109 .disable_swap = xs_disable_swap,
3110 .inject_disconnect = xs_inject_disconnect,
3111#ifdef CONFIG_SUNRPC_BACKCHANNEL
3112 .bc_setup = xprt_setup_bc,
3113 .bc_maxpayload = xs_tcp_bc_maxpayload,
3114 .bc_num_slots = xprt_bc_max_slots,
3115 .bc_free_rqst = xprt_free_bc_rqst,
3116 .bc_destroy = xprt_destroy_bc,
3117#endif
3118};
3119
3120/*
3121 * The rpc_xprt_ops for the server backchannel
3122 */
3123
3124static const struct rpc_xprt_ops bc_tcp_ops = {
3125 .reserve_xprt = xprt_reserve_xprt,
3126 .release_xprt = xprt_release_xprt,
3127 .alloc_slot = xprt_alloc_slot,
3128 .free_slot = xprt_free_slot,
3129 .buf_alloc = bc_malloc,
3130 .buf_free = bc_free,
3131 .send_request = bc_send_request,
3132 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3133 .close = bc_close,
3134 .destroy = bc_destroy,
3135 .print_stats = xs_tcp_print_stats,
3136 .enable_swap = xs_enable_swap,
3137 .disable_swap = xs_disable_swap,
3138 .inject_disconnect = xs_inject_disconnect,
3139};
3140
3141static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3142{
3143 static const struct sockaddr_in sin = {
3144 .sin_family = AF_INET,
3145 .sin_addr.s_addr = htonl(INADDR_ANY),
3146 };
3147 static const struct sockaddr_in6 sin6 = {
3148 .sin6_family = AF_INET6,
3149 .sin6_addr = IN6ADDR_ANY_INIT,
3150 };
3151
3152 switch (family) {
3153 case AF_LOCAL:
3154 break;
3155 case AF_INET:
3156 memcpy(sap, &sin, sizeof(sin));
3157 break;
3158 case AF_INET6:
3159 memcpy(sap, &sin6, sizeof(sin6));
3160 break;
3161 default:
3162 dprintk("RPC: %s: Bad address family\n", __func__);
3163 return -EAFNOSUPPORT;
3164 }
3165 return 0;
3166}
3167
3168static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3169 unsigned int slot_table_size,
3170 unsigned int max_slot_table_size)
3171{
3172 struct rpc_xprt *xprt;
3173 struct sock_xprt *new;
3174
3175 if (args->addrlen > sizeof(xprt->addr)) {
3176 dprintk("RPC: xs_setup_xprt: address too large\n");
3177 return ERR_PTR(-EBADF);
3178 }
3179
3180 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
3181 max_slot_table_size);
3182 if (xprt == NULL) {
3183 dprintk("RPC: xs_setup_xprt: couldn't allocate "
3184 "rpc_xprt\n");
3185 return ERR_PTR(-ENOMEM);
3186 }
3187
3188 new = container_of(xprt, struct sock_xprt, xprt);
3189 mutex_init(&new->recv_mutex);
3190 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3191 xprt->addrlen = args->addrlen;
3192 if (args->srcaddr)
3193 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3194 else {
3195 int err;
3196 err = xs_init_anyaddr(args->dstaddr->sa_family,
3197 (struct sockaddr *)&new->srcaddr);
3198 if (err != 0) {
3199 xprt_free(xprt);
3200 return ERR_PTR(err);
3201 }
3202 }
3203
3204 return xprt;
3205}
3206
3207static const struct rpc_timeout xs_local_default_timeout = {
3208 .to_initval = 10 * HZ,
3209 .to_maxval = 10 * HZ,
3210 .to_retries = 2,
3211};
3212
3213/**
3214 * xs_setup_local - Set up transport to use an AF_LOCAL socket
3215 * @args: rpc transport creation arguments
3216 *
3217 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3218 */
3219static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3220{
3221 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3222 struct sock_xprt *transport;
3223 struct rpc_xprt *xprt;
3224 struct rpc_xprt *ret;
3225
3226 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3227 xprt_max_tcp_slot_table_entries);
3228 if (IS_ERR(xprt))
3229 return xprt;
3230 transport = container_of(xprt, struct sock_xprt, xprt);
3231
3232 xprt->prot = 0;
3233 xprt->xprt_class = &xs_local_transport;
3234 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3235
3236 xprt->bind_timeout = XS_BIND_TO;
3237 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3238 xprt->idle_timeout = XS_IDLE_DISC_TO;
3239
3240 xprt->ops = &xs_local_ops;
3241 xprt->timeout = &xs_local_default_timeout;
3242
3243 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3244 INIT_WORK(&transport->error_worker, xs_error_handle);
3245 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3246
3247 switch (sun->sun_family) {
3248 case AF_LOCAL:
3249 if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3250 dprintk("RPC: bad AF_LOCAL address: %s\n",
3251 sun->sun_path);
3252 ret = ERR_PTR(-EINVAL);
3253 goto out_err;
3254 }
3255 xprt_set_bound(xprt);
3256 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
3257 break;
3258 default:
3259 ret = ERR_PTR(-EAFNOSUPPORT);
3260 goto out_err;
3261 }
3262
3263 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
3264 xprt->address_strings[RPC_DISPLAY_ADDR]);
3265
3266 if (try_module_get(THIS_MODULE))
3267 return xprt;
3268 ret = ERR_PTR(-EINVAL);
3269out_err:
3270 xs_xprt_free(xprt);
3271 return ret;
3272}
3273
3274static const struct rpc_timeout xs_udp_default_timeout = {
3275 .to_initval = 5 * HZ,
3276 .to_maxval = 30 * HZ,
3277 .to_increment = 5 * HZ,
3278 .to_retries = 5,
3279};
3280
3281/**
3282 * xs_setup_udp - Set up transport to use a UDP socket
3283 * @args: rpc transport creation arguments
3284 *
3285 */
3286static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3287{
3288 struct sockaddr *addr = args->dstaddr;
3289 struct rpc_xprt *xprt;
3290 struct sock_xprt *transport;
3291 struct rpc_xprt *ret;
3292
3293 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3294 xprt_udp_slot_table_entries);
3295 if (IS_ERR(xprt))
3296 return xprt;
3297 transport = container_of(xprt, struct sock_xprt, xprt);
3298
3299 xprt->prot = IPPROTO_UDP;
3300 xprt->xprt_class = &xs_udp_transport;
3301 /* XXX: header size can vary due to auth type, IPv6, etc. */
3302 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3303
3304 xprt->bind_timeout = XS_BIND_TO;
3305 xprt->reestablish_timeout = XS_UDP_REEST_TO;
3306 xprt->idle_timeout = XS_IDLE_DISC_TO;
3307
3308 xprt->ops = &xs_udp_ops;
3309
3310 xprt->timeout = &xs_udp_default_timeout;
3311
3312 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3313 INIT_WORK(&transport->error_worker, xs_error_handle);
3314 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3315
3316 switch (addr->sa_family) {
3317 case AF_INET:
3318 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3319 xprt_set_bound(xprt);
3320
3321 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3322 break;
3323 case AF_INET6:
3324 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3325 xprt_set_bound(xprt);
3326
3327 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3328 break;
3329 default:
3330 ret = ERR_PTR(-EAFNOSUPPORT);
3331 goto out_err;
3332 }
3333
3334 if (xprt_bound(xprt))
3335 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3336 xprt->address_strings[RPC_DISPLAY_ADDR],
3337 xprt->address_strings[RPC_DISPLAY_PORT],
3338 xprt->address_strings[RPC_DISPLAY_PROTO]);
3339 else
3340 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3341 xprt->address_strings[RPC_DISPLAY_ADDR],
3342 xprt->address_strings[RPC_DISPLAY_PROTO]);
3343
3344 if (try_module_get(THIS_MODULE))
3345 return xprt;
3346 ret = ERR_PTR(-EINVAL);
3347out_err:
3348 xs_xprt_free(xprt);
3349 return ret;
3350}
3351
3352static const struct rpc_timeout xs_tcp_default_timeout = {
3353 .to_initval = 60 * HZ,
3354 .to_maxval = 60 * HZ,
3355 .to_retries = 2,
3356};
3357
3358/**
3359 * xs_setup_tcp - Set up transport to use a TCP socket
3360 * @args: rpc transport creation arguments
3361 *
3362 */
3363static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3364{
3365 struct sockaddr *addr = args->dstaddr;
3366 struct rpc_xprt *xprt;
3367 struct sock_xprt *transport;
3368 struct rpc_xprt *ret;
3369 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3370
3371 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3372 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3373
3374 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3375 max_slot_table_size);
3376 if (IS_ERR(xprt))
3377 return xprt;
3378 transport = container_of(xprt, struct sock_xprt, xprt);
3379
3380 xprt->prot = IPPROTO_TCP;
3381 xprt->xprt_class = &xs_tcp_transport;
3382 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3383
3384 xprt->bind_timeout = XS_BIND_TO;
3385 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3386 xprt->idle_timeout = XS_IDLE_DISC_TO;
3387
3388 xprt->ops = &xs_tcp_ops;
3389 xprt->timeout = &xs_tcp_default_timeout;
3390
3391 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3392 if (args->reconnect_timeout)
3393 xprt->max_reconnect_timeout = args->reconnect_timeout;
3394
3395 xprt->connect_timeout = xprt->timeout->to_initval *
3396 (xprt->timeout->to_retries + 1);
3397 if (args->connect_timeout)
3398 xs_tcp_do_set_connect_timeout(xprt, args->connect_timeout);
3399
3400 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3401 INIT_WORK(&transport->error_worker, xs_error_handle);
3402 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3403
3404 switch (addr->sa_family) {
3405 case AF_INET:
3406 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3407 xprt_set_bound(xprt);
3408
3409 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3410 break;
3411 case AF_INET6:
3412 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3413 xprt_set_bound(xprt);
3414
3415 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3416 break;
3417 default:
3418 ret = ERR_PTR(-EAFNOSUPPORT);
3419 goto out_err;
3420 }
3421
3422 if (xprt_bound(xprt))
3423 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3424 xprt->address_strings[RPC_DISPLAY_ADDR],
3425 xprt->address_strings[RPC_DISPLAY_PORT],
3426 xprt->address_strings[RPC_DISPLAY_PROTO]);
3427 else
3428 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3429 xprt->address_strings[RPC_DISPLAY_ADDR],
3430 xprt->address_strings[RPC_DISPLAY_PROTO]);
3431
3432 if (try_module_get(THIS_MODULE))
3433 return xprt;
3434 ret = ERR_PTR(-EINVAL);
3435out_err:
3436 xs_xprt_free(xprt);
3437 return ret;
3438}
3439
3440/**
3441 * xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3442 * @args: rpc transport creation arguments
3443 *
3444 */
3445static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3446{
3447 struct sockaddr *addr = args->dstaddr;
3448 struct rpc_xprt *xprt;
3449 struct sock_xprt *transport;
3450 struct rpc_xprt *ret;
3451 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3452
3453 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3454 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3455
3456 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3457 max_slot_table_size);
3458 if (IS_ERR(xprt))
3459 return xprt;
3460 transport = container_of(xprt, struct sock_xprt, xprt);
3461
3462 xprt->prot = IPPROTO_TCP;
3463 xprt->xprt_class = &xs_tcp_transport;
3464 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3465
3466 xprt->bind_timeout = XS_BIND_TO;
3467 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3468 xprt->idle_timeout = XS_IDLE_DISC_TO;
3469
3470 xprt->ops = &xs_tcp_ops;
3471 xprt->timeout = &xs_tcp_default_timeout;
3472
3473 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3474 xprt->connect_timeout = xprt->timeout->to_initval *
3475 (xprt->timeout->to_retries + 1);
3476
3477 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3478 INIT_WORK(&transport->error_worker, xs_error_handle);
3479
3480 switch (args->xprtsec.policy) {
3481 case RPC_XPRTSEC_TLS_ANON:
3482 case RPC_XPRTSEC_TLS_X509:
3483 xprt->xprtsec = args->xprtsec;
3484 INIT_DELAYED_WORK(&transport->connect_worker,
3485 xs_tcp_tls_setup_socket);
3486 break;
3487 default:
3488 ret = ERR_PTR(-EACCES);
3489 goto out_err;
3490 }
3491
3492 switch (addr->sa_family) {
3493 case AF_INET:
3494 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3495 xprt_set_bound(xprt);
3496
3497 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3498 break;
3499 case AF_INET6:
3500 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3501 xprt_set_bound(xprt);
3502
3503 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3504 break;
3505 default:
3506 ret = ERR_PTR(-EAFNOSUPPORT);
3507 goto out_err;
3508 }
3509
3510 if (xprt_bound(xprt))
3511 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3512 xprt->address_strings[RPC_DISPLAY_ADDR],
3513 xprt->address_strings[RPC_DISPLAY_PORT],
3514 xprt->address_strings[RPC_DISPLAY_PROTO]);
3515 else
3516 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3517 xprt->address_strings[RPC_DISPLAY_ADDR],
3518 xprt->address_strings[RPC_DISPLAY_PROTO]);
3519
3520 if (try_module_get(THIS_MODULE))
3521 return xprt;
3522 ret = ERR_PTR(-EINVAL);
3523out_err:
3524 xs_xprt_free(xprt);
3525 return ret;
3526}
3527
3528/**
3529 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3530 * @args: rpc transport creation arguments
3531 *
3532 */
3533static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3534{
3535 struct sockaddr *addr = args->dstaddr;
3536 struct rpc_xprt *xprt;
3537 struct sock_xprt *transport;
3538 struct svc_sock *bc_sock;
3539 struct rpc_xprt *ret;
3540
3541 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3542 xprt_tcp_slot_table_entries);
3543 if (IS_ERR(xprt))
3544 return xprt;
3545 transport = container_of(xprt, struct sock_xprt, xprt);
3546
3547 xprt->prot = IPPROTO_TCP;
3548 xprt->xprt_class = &xs_bc_tcp_transport;
3549 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3550 xprt->timeout = &xs_tcp_default_timeout;
3551
3552 /* backchannel */
3553 xprt_set_bound(xprt);
3554 xprt->bind_timeout = 0;
3555 xprt->reestablish_timeout = 0;
3556 xprt->idle_timeout = 0;
3557
3558 xprt->ops = &bc_tcp_ops;
3559
3560 switch (addr->sa_family) {
3561 case AF_INET:
3562 xs_format_peer_addresses(xprt, "tcp",
3563 RPCBIND_NETID_TCP);
3564 break;
3565 case AF_INET6:
3566 xs_format_peer_addresses(xprt, "tcp",
3567 RPCBIND_NETID_TCP6);
3568 break;
3569 default:
3570 ret = ERR_PTR(-EAFNOSUPPORT);
3571 goto out_err;
3572 }
3573
3574 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3575 xprt->address_strings[RPC_DISPLAY_ADDR],
3576 xprt->address_strings[RPC_DISPLAY_PORT],
3577 xprt->address_strings[RPC_DISPLAY_PROTO]);
3578
3579 /*
3580 * Once we've associated a backchannel xprt with a connection,
3581 * we want to keep it around as long as the connection lasts,
3582 * in case we need to start using it for a backchannel again;
3583 * this reference won't be dropped until bc_xprt is destroyed.
3584 */
3585 xprt_get(xprt);
3586 args->bc_xprt->xpt_bc_xprt = xprt;
3587 xprt->bc_xprt = args->bc_xprt;
3588 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3589 transport->sock = bc_sock->sk_sock;
3590 transport->inet = bc_sock->sk_sk;
3591
3592 /*
3593 * Since we don't want connections for the backchannel, we set
3594 * the xprt status to connected
3595 */
3596 xprt_set_connected(xprt);
3597
3598 if (try_module_get(THIS_MODULE))
3599 return xprt;
3600
3601 args->bc_xprt->xpt_bc_xprt = NULL;
3602 args->bc_xprt->xpt_bc_xps = NULL;
3603 xprt_put(xprt);
3604 ret = ERR_PTR(-EINVAL);
3605out_err:
3606 xs_xprt_free(xprt);
3607 return ret;
3608}
3609
3610static struct xprt_class xs_local_transport = {
3611 .list = LIST_HEAD_INIT(xs_local_transport.list),
3612 .name = "named UNIX socket",
3613 .owner = THIS_MODULE,
3614 .ident = XPRT_TRANSPORT_LOCAL,
3615 .setup = xs_setup_local,
3616 .netid = { "" },
3617};
3618
3619static struct xprt_class xs_udp_transport = {
3620 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3621 .name = "udp",
3622 .owner = THIS_MODULE,
3623 .ident = XPRT_TRANSPORT_UDP,
3624 .setup = xs_setup_udp,
3625 .netid = { "udp", "udp6", "" },
3626};
3627
3628static struct xprt_class xs_tcp_transport = {
3629 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3630 .name = "tcp",
3631 .owner = THIS_MODULE,
3632 .ident = XPRT_TRANSPORT_TCP,
3633 .setup = xs_setup_tcp,
3634 .netid = { "tcp", "tcp6", "" },
3635};
3636
3637static struct xprt_class xs_tcp_tls_transport = {
3638 .list = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3639 .name = "tcp-with-tls",
3640 .owner = THIS_MODULE,
3641 .ident = XPRT_TRANSPORT_TCP_TLS,
3642 .setup = xs_setup_tcp_tls,
3643 .netid = { "tcp", "tcp6", "" },
3644};
3645
3646static struct xprt_class xs_bc_tcp_transport = {
3647 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3648 .name = "tcp NFSv4.1 backchannel",
3649 .owner = THIS_MODULE,
3650 .ident = XPRT_TRANSPORT_BC_TCP,
3651 .setup = xs_setup_bc_tcp,
3652 .netid = { "" },
3653};
3654
3655/**
3656 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3657 *
3658 */
3659int init_socket_xprt(void)
3660{
3661 if (!sunrpc_table_header)
3662 sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3663
3664 xprt_register_transport(&xs_local_transport);
3665 xprt_register_transport(&xs_udp_transport);
3666 xprt_register_transport(&xs_tcp_transport);
3667 xprt_register_transport(&xs_tcp_tls_transport);
3668 xprt_register_transport(&xs_bc_tcp_transport);
3669
3670 return 0;
3671}
3672
3673/**
3674 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3675 *
3676 */
3677void cleanup_socket_xprt(void)
3678{
3679 if (sunrpc_table_header) {
3680 unregister_sysctl_table(sunrpc_table_header);
3681 sunrpc_table_header = NULL;
3682 }
3683
3684 xprt_unregister_transport(&xs_local_transport);
3685 xprt_unregister_transport(&xs_udp_transport);
3686 xprt_unregister_transport(&xs_tcp_transport);
3687 xprt_unregister_transport(&xs_tcp_tls_transport);
3688 xprt_unregister_transport(&xs_bc_tcp_transport);
3689}
3690
3691static int param_set_portnr(const char *val, const struct kernel_param *kp)
3692{
3693 return param_set_uint_minmax(val, kp,
3694 RPC_MIN_RESVPORT,
3695 RPC_MAX_RESVPORT);
3696}
3697
3698static const struct kernel_param_ops param_ops_portnr = {
3699 .set = param_set_portnr,
3700 .get = param_get_uint,
3701};
3702
3703#define param_check_portnr(name, p) \
3704 __param_check(name, p, unsigned int);
3705
3706module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3707module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3708
3709static int param_set_slot_table_size(const char *val,
3710 const struct kernel_param *kp)
3711{
3712 return param_set_uint_minmax(val, kp,
3713 RPC_MIN_SLOT_TABLE,
3714 RPC_MAX_SLOT_TABLE);
3715}
3716
3717static const struct kernel_param_ops param_ops_slot_table_size = {
3718 .set = param_set_slot_table_size,
3719 .get = param_get_uint,
3720};
3721
3722#define param_check_slot_table_size(name, p) \
3723 __param_check(name, p, unsigned int);
3724
3725static int param_set_max_slot_table_size(const char *val,
3726 const struct kernel_param *kp)
3727{
3728 return param_set_uint_minmax(val, kp,
3729 RPC_MIN_SLOT_TABLE,
3730 RPC_MAX_SLOT_TABLE_LIMIT);
3731}
3732
3733static const struct kernel_param_ops param_ops_max_slot_table_size = {
3734 .set = param_set_max_slot_table_size,
3735 .get = param_get_uint,
3736};
3737
3738#define param_check_max_slot_table_size(name, p) \
3739 __param_check(name, p, unsigned int);
3740
3741module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3742 slot_table_size, 0644);
3743module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3744 max_slot_table_size, 0644);
3745module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3746 slot_table_size, 0644);
1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/capability.h>
26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
32#include <linux/un.h>
33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
36#include <linux/sunrpc/addr.h>
37#include <linux/sunrpc/sched.h>
38#include <linux/sunrpc/svcsock.h>
39#include <linux/sunrpc/xprtsock.h>
40#include <linux/file.h>
41#ifdef CONFIG_SUNRPC_BACKCHANNEL
42#include <linux/sunrpc/bc_xprt.h>
43#endif
44
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
50#include <trace/events/sunrpc.h>
51
52#include "sunrpc.h"
53
54static void xs_close(struct rpc_xprt *xprt);
55
56/*
57 * xprtsock tunables
58 */
59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
62
63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
65
66#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
67
68#define XS_TCP_LINGER_TO (15U * HZ)
69static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
70
71/*
72 * We can register our own files under /proc/sys/sunrpc by
73 * calling register_sysctl_table() again. The files in that
74 * directory become the union of all files registered there.
75 *
76 * We simply need to make sure that we don't collide with
77 * someone else's file names!
78 */
79
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88/*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
92static struct ctl_table xs_tunables_table[] = {
93 {
94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_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_tcp_slot_table_limit
119 },
120 {
121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
143 .proc_handler = proc_dointvec_jiffies,
144 },
145 { },
146};
147
148static struct ctl_table sunrpc_table[] = {
149 {
150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
154 { },
155};
156
157#endif
158
159/*
160 * Wait duration for a reply from the RPC portmapper.
161 */
162#define XS_BIND_TO (60U * HZ)
163
164/*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168#define XS_UDP_REEST_TO (2U * HZ)
169
170/*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182/*
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
186 */
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
189#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
190# undef RPC_DEBUG_DATA
191# define RPCDBG_FACILITY RPCDBG_TRANS
192#endif
193
194#ifdef RPC_DEBUG_DATA
195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
196{
197 u8 *buf = (u8 *) packet;
198 int j;
199
200 dprintk("RPC: %s\n", msg);
201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
214{
215 /* NOP */
216}
217#endif
218
219static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220{
221 return (struct rpc_xprt *) sk->sk_user_data;
222}
223
224static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225{
226 return (struct sockaddr *) &xprt->addr;
227}
228
229static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230{
231 return (struct sockaddr_un *) &xprt->addr;
232}
233
234static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
235{
236 return (struct sockaddr_in *) &xprt->addr;
237}
238
239static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_in6 *) &xprt->addr;
242}
243
244static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
245{
246 struct sockaddr *sap = xs_addr(xprt);
247 struct sockaddr_in6 *sin6;
248 struct sockaddr_in *sin;
249 struct sockaddr_un *sun;
250 char buf[128];
251
252 switch (sap->sa_family) {
253 case AF_LOCAL:
254 sun = xs_addr_un(xprt);
255 strlcpy(buf, sun->sun_path, sizeof(buf));
256 xprt->address_strings[RPC_DISPLAY_ADDR] =
257 kstrdup(buf, GFP_KERNEL);
258 break;
259 case AF_INET:
260 (void)rpc_ntop(sap, buf, sizeof(buf));
261 xprt->address_strings[RPC_DISPLAY_ADDR] =
262 kstrdup(buf, GFP_KERNEL);
263 sin = xs_addr_in(xprt);
264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
265 break;
266 case AF_INET6:
267 (void)rpc_ntop(sap, buf, sizeof(buf));
268 xprt->address_strings[RPC_DISPLAY_ADDR] =
269 kstrdup(buf, GFP_KERNEL);
270 sin6 = xs_addr_in6(xprt);
271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
272 break;
273 default:
274 BUG();
275 }
276
277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
278}
279
280static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
281{
282 struct sockaddr *sap = xs_addr(xprt);
283 char buf[128];
284
285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
287
288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
290}
291
292static void xs_format_peer_addresses(struct rpc_xprt *xprt,
293 const char *protocol,
294 const char *netid)
295{
296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
297 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
298 xs_format_common_peer_addresses(xprt);
299 xs_format_common_peer_ports(xprt);
300}
301
302static void xs_update_peer_port(struct rpc_xprt *xprt)
303{
304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
306
307 xs_format_common_peer_ports(xprt);
308}
309
310static void xs_free_peer_addresses(struct rpc_xprt *xprt)
311{
312 unsigned int i;
313
314 for (i = 0; i < RPC_DISPLAY_MAX; i++)
315 switch (i) {
316 case RPC_DISPLAY_PROTO:
317 case RPC_DISPLAY_NETID:
318 continue;
319 default:
320 kfree(xprt->address_strings[i]);
321 }
322}
323
324#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
325
326static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
327{
328 struct msghdr msg = {
329 .msg_name = addr,
330 .msg_namelen = addrlen,
331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
332 };
333 struct kvec iov = {
334 .iov_base = vec->iov_base + base,
335 .iov_len = vec->iov_len - base,
336 };
337
338 if (iov.iov_len != 0)
339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
340 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
341}
342
343static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
344{
345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
346 int offset, size_t size, int flags);
347 struct page **ppage;
348 unsigned int remainder;
349 int err;
350
351 remainder = xdr->page_len - base;
352 base += xdr->page_base;
353 ppage = xdr->pages + (base >> PAGE_SHIFT);
354 base &= ~PAGE_MASK;
355 do_sendpage = sock->ops->sendpage;
356 if (!zerocopy)
357 do_sendpage = sock_no_sendpage;
358 for(;;) {
359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
360 int flags = XS_SENDMSG_FLAGS;
361
362 remainder -= len;
363 if (more)
364 flags |= MSG_MORE;
365 if (remainder != 0)
366 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
367 err = do_sendpage(sock, *ppage, base, len, flags);
368 if (remainder == 0 || err != len)
369 break;
370 *sent_p += err;
371 ppage++;
372 base = 0;
373 }
374 if (err > 0) {
375 *sent_p += err;
376 err = 0;
377 }
378 return err;
379}
380
381/**
382 * xs_sendpages - write pages directly to a socket
383 * @sock: socket to send on
384 * @addr: UDP only -- address of destination
385 * @addrlen: UDP only -- length of destination address
386 * @xdr: buffer containing this request
387 * @base: starting position in the buffer
388 * @zerocopy: true if it is safe to use sendpage()
389 * @sent_p: return the total number of bytes successfully queued for sending
390 *
391 */
392static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
393{
394 unsigned int remainder = xdr->len - base;
395 int err = 0;
396 int sent = 0;
397
398 if (unlikely(!sock))
399 return -ENOTSOCK;
400
401 if (base != 0) {
402 addr = NULL;
403 addrlen = 0;
404 }
405
406 if (base < xdr->head[0].iov_len || addr != NULL) {
407 unsigned int len = xdr->head[0].iov_len - base;
408 remainder -= len;
409 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
410 if (remainder == 0 || err != len)
411 goto out;
412 *sent_p += err;
413 base = 0;
414 } else
415 base -= xdr->head[0].iov_len;
416
417 if (base < xdr->page_len) {
418 unsigned int len = xdr->page_len - base;
419 remainder -= len;
420 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
421 *sent_p += sent;
422 if (remainder == 0 || sent != len)
423 goto out;
424 base = 0;
425 } else
426 base -= xdr->page_len;
427
428 if (base >= xdr->tail[0].iov_len)
429 return 0;
430 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
431out:
432 if (err > 0) {
433 *sent_p += err;
434 err = 0;
435 }
436 return err;
437}
438
439static void xs_nospace_callback(struct rpc_task *task)
440{
441 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
442
443 transport->inet->sk_write_pending--;
444}
445
446/**
447 * xs_nospace - place task on wait queue if transmit was incomplete
448 * @task: task to put to sleep
449 *
450 */
451static int xs_nospace(struct rpc_task *task)
452{
453 struct rpc_rqst *req = task->tk_rqstp;
454 struct rpc_xprt *xprt = req->rq_xprt;
455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
456 struct sock *sk = transport->inet;
457 int ret = -EAGAIN;
458
459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
460 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
461 req->rq_slen);
462
463 /* Protect against races with write_space */
464 spin_lock_bh(&xprt->transport_lock);
465
466 /* Don't race with disconnect */
467 if (xprt_connected(xprt)) {
468 /* wait for more buffer space */
469 sk->sk_write_pending++;
470 xprt_wait_for_buffer_space(task, xs_nospace_callback);
471 } else
472 ret = -ENOTCONN;
473
474 spin_unlock_bh(&xprt->transport_lock);
475
476 /* Race breaker in case memory is freed before above code is called */
477 sk->sk_write_space(sk);
478 return ret;
479}
480
481/*
482 * Construct a stream transport record marker in @buf.
483 */
484static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
485{
486 u32 reclen = buf->len - sizeof(rpc_fraghdr);
487 rpc_fraghdr *base = buf->head[0].iov_base;
488 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
489}
490
491/**
492 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
493 * @task: RPC task that manages the state of an RPC request
494 *
495 * Return values:
496 * 0: The request has been sent
497 * EAGAIN: The socket was blocked, please call again later to
498 * complete the request
499 * ENOTCONN: Caller needs to invoke connect logic then call again
500 * other: Some other error occured, the request was not sent
501 */
502static int xs_local_send_request(struct rpc_task *task)
503{
504 struct rpc_rqst *req = task->tk_rqstp;
505 struct rpc_xprt *xprt = req->rq_xprt;
506 struct sock_xprt *transport =
507 container_of(xprt, struct sock_xprt, xprt);
508 struct xdr_buf *xdr = &req->rq_snd_buf;
509 int status;
510 int sent = 0;
511
512 xs_encode_stream_record_marker(&req->rq_snd_buf);
513
514 xs_pktdump("packet data:",
515 req->rq_svec->iov_base, req->rq_svec->iov_len);
516
517 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
518 true, &sent);
519 dprintk("RPC: %s(%u) = %d\n",
520 __func__, xdr->len - req->rq_bytes_sent, status);
521
522 if (status == -EAGAIN && sock_writeable(transport->inet))
523 status = -ENOBUFS;
524
525 if (likely(sent > 0) || status == 0) {
526 req->rq_bytes_sent += sent;
527 req->rq_xmit_bytes_sent += sent;
528 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
529 req->rq_bytes_sent = 0;
530 return 0;
531 }
532 status = -EAGAIN;
533 }
534
535 switch (status) {
536 case -ENOBUFS:
537 break;
538 case -EAGAIN:
539 status = xs_nospace(task);
540 break;
541 default:
542 dprintk("RPC: sendmsg returned unrecognized error %d\n",
543 -status);
544 case -EPIPE:
545 xs_close(xprt);
546 status = -ENOTCONN;
547 }
548
549 return status;
550}
551
552/**
553 * xs_udp_send_request - write an RPC request to a UDP socket
554 * @task: address of RPC task that manages the state of an RPC request
555 *
556 * Return values:
557 * 0: The request has been sent
558 * EAGAIN: The socket was blocked, please call again later to
559 * complete the request
560 * ENOTCONN: Caller needs to invoke connect logic then call again
561 * other: Some other error occurred, the request was not sent
562 */
563static int xs_udp_send_request(struct rpc_task *task)
564{
565 struct rpc_rqst *req = task->tk_rqstp;
566 struct rpc_xprt *xprt = req->rq_xprt;
567 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
568 struct xdr_buf *xdr = &req->rq_snd_buf;
569 int sent = 0;
570 int status;
571
572 xs_pktdump("packet data:",
573 req->rq_svec->iov_base,
574 req->rq_svec->iov_len);
575
576 if (!xprt_bound(xprt))
577 return -ENOTCONN;
578 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
579 xdr, req->rq_bytes_sent, true, &sent);
580
581 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
582 xdr->len - req->rq_bytes_sent, status);
583
584 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
585 if (status == -EPERM)
586 goto process_status;
587
588 if (status == -EAGAIN && sock_writeable(transport->inet))
589 status = -ENOBUFS;
590
591 if (sent > 0 || status == 0) {
592 req->rq_xmit_bytes_sent += sent;
593 if (sent >= req->rq_slen)
594 return 0;
595 /* Still some bytes left; set up for a retry later. */
596 status = -EAGAIN;
597 }
598
599process_status:
600 switch (status) {
601 case -ENOTSOCK:
602 status = -ENOTCONN;
603 /* Should we call xs_close() here? */
604 break;
605 case -EAGAIN:
606 status = xs_nospace(task);
607 break;
608 case -ENETUNREACH:
609 case -ENOBUFS:
610 case -EPIPE:
611 case -ECONNREFUSED:
612 case -EPERM:
613 /* When the server has died, an ICMP port unreachable message
614 * prompts ECONNREFUSED. */
615 break;
616 default:
617 dprintk("RPC: sendmsg returned unrecognized error %d\n",
618 -status);
619 }
620
621 return status;
622}
623
624/**
625 * xs_tcp_send_request - write an RPC request to a TCP socket
626 * @task: address of RPC task that manages the state of an RPC request
627 *
628 * Return values:
629 * 0: The request has been sent
630 * EAGAIN: The socket was blocked, please call again later to
631 * complete the request
632 * ENOTCONN: Caller needs to invoke connect logic then call again
633 * other: Some other error occurred, the request was not sent
634 *
635 * XXX: In the case of soft timeouts, should we eventually give up
636 * if sendmsg is not able to make progress?
637 */
638static int xs_tcp_send_request(struct rpc_task *task)
639{
640 struct rpc_rqst *req = task->tk_rqstp;
641 struct rpc_xprt *xprt = req->rq_xprt;
642 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
643 struct xdr_buf *xdr = &req->rq_snd_buf;
644 bool zerocopy = true;
645 int status;
646 int sent;
647
648 xs_encode_stream_record_marker(&req->rq_snd_buf);
649
650 xs_pktdump("packet data:",
651 req->rq_svec->iov_base,
652 req->rq_svec->iov_len);
653 /* Don't use zero copy if this is a resend. If the RPC call
654 * completes while the socket holds a reference to the pages,
655 * then we may end up resending corrupted data.
656 */
657 if (task->tk_flags & RPC_TASK_SENT)
658 zerocopy = false;
659
660 /* Continue transmitting the packet/record. We must be careful
661 * to cope with writespace callbacks arriving _after_ we have
662 * called sendmsg(). */
663 while (1) {
664 sent = 0;
665 status = xs_sendpages(transport->sock, NULL, 0, xdr,
666 req->rq_bytes_sent, zerocopy, &sent);
667
668 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
669 xdr->len - req->rq_bytes_sent, status);
670
671 /* If we've sent the entire packet, immediately
672 * reset the count of bytes sent. */
673 req->rq_bytes_sent += sent;
674 req->rq_xmit_bytes_sent += sent;
675 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
676 req->rq_bytes_sent = 0;
677 return 0;
678 }
679
680 if (status < 0)
681 break;
682 if (sent == 0) {
683 status = -EAGAIN;
684 break;
685 }
686 }
687 if (status == -EAGAIN && sk_stream_is_writeable(transport->inet))
688 status = -ENOBUFS;
689
690 switch (status) {
691 case -ENOTSOCK:
692 status = -ENOTCONN;
693 /* Should we call xs_close() here? */
694 break;
695 case -EAGAIN:
696 status = xs_nospace(task);
697 break;
698 case -ECONNRESET:
699 case -ECONNREFUSED:
700 case -ENOTCONN:
701 case -EADDRINUSE:
702 case -ENOBUFS:
703 case -EPIPE:
704 break;
705 default:
706 dprintk("RPC: sendmsg returned unrecognized error %d\n",
707 -status);
708 }
709
710 return status;
711}
712
713/**
714 * xs_tcp_release_xprt - clean up after a tcp transmission
715 * @xprt: transport
716 * @task: rpc task
717 *
718 * This cleans up if an error causes us to abort the transmission of a request.
719 * In this case, the socket may need to be reset in order to avoid confusing
720 * the server.
721 */
722static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
723{
724 struct rpc_rqst *req;
725
726 if (task != xprt->snd_task)
727 return;
728 if (task == NULL)
729 goto out_release;
730 req = task->tk_rqstp;
731 if (req == NULL)
732 goto out_release;
733 if (req->rq_bytes_sent == 0)
734 goto out_release;
735 if (req->rq_bytes_sent == req->rq_snd_buf.len)
736 goto out_release;
737 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
738out_release:
739 xprt_release_xprt(xprt, task);
740}
741
742static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
743{
744 transport->old_data_ready = sk->sk_data_ready;
745 transport->old_state_change = sk->sk_state_change;
746 transport->old_write_space = sk->sk_write_space;
747 transport->old_error_report = sk->sk_error_report;
748}
749
750static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
751{
752 sk->sk_data_ready = transport->old_data_ready;
753 sk->sk_state_change = transport->old_state_change;
754 sk->sk_write_space = transport->old_write_space;
755 sk->sk_error_report = transport->old_error_report;
756}
757
758static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
759{
760 smp_mb__before_atomic();
761 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
762 clear_bit(XPRT_CLOSING, &xprt->state);
763 smp_mb__after_atomic();
764}
765
766static void xs_sock_mark_closed(struct rpc_xprt *xprt)
767{
768 xs_sock_reset_connection_flags(xprt);
769 /* Mark transport as closed and wake up all pending tasks */
770 xprt_disconnect_done(xprt);
771}
772
773/**
774 * xs_error_report - callback to handle TCP socket state errors
775 * @sk: socket
776 *
777 * Note: we don't call sock_error() since there may be a rpc_task
778 * using the socket, and so we don't want to clear sk->sk_err.
779 */
780static void xs_error_report(struct sock *sk)
781{
782 struct rpc_xprt *xprt;
783 int err;
784
785 read_lock_bh(&sk->sk_callback_lock);
786 if (!(xprt = xprt_from_sock(sk)))
787 goto out;
788
789 err = -sk->sk_err;
790 if (err == 0)
791 goto out;
792 /* Is this a reset event? */
793 if (sk->sk_state == TCP_CLOSE)
794 xs_sock_mark_closed(xprt);
795 dprintk("RPC: xs_error_report client %p, error=%d...\n",
796 xprt, -err);
797 trace_rpc_socket_error(xprt, sk->sk_socket, err);
798 xprt_wake_pending_tasks(xprt, err);
799 out:
800 read_unlock_bh(&sk->sk_callback_lock);
801}
802
803static void xs_reset_transport(struct sock_xprt *transport)
804{
805 struct socket *sock = transport->sock;
806 struct sock *sk = transport->inet;
807 struct rpc_xprt *xprt = &transport->xprt;
808
809 if (sk == NULL)
810 return;
811
812 if (atomic_read(&transport->xprt.swapper))
813 sk_clear_memalloc(sk);
814
815 kernel_sock_shutdown(sock, SHUT_RDWR);
816
817 mutex_lock(&transport->recv_mutex);
818 write_lock_bh(&sk->sk_callback_lock);
819 transport->inet = NULL;
820 transport->sock = NULL;
821
822 sk->sk_user_data = NULL;
823
824 xs_restore_old_callbacks(transport, sk);
825 xprt_clear_connected(xprt);
826 write_unlock_bh(&sk->sk_callback_lock);
827 xs_sock_reset_connection_flags(xprt);
828 mutex_unlock(&transport->recv_mutex);
829
830 trace_rpc_socket_close(xprt, sock);
831 sock_release(sock);
832}
833
834/**
835 * xs_close - close a socket
836 * @xprt: transport
837 *
838 * This is used when all requests are complete; ie, no DRC state remains
839 * on the server we want to save.
840 *
841 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
842 * xs_reset_transport() zeroing the socket from underneath a writer.
843 */
844static void xs_close(struct rpc_xprt *xprt)
845{
846 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
847
848 dprintk("RPC: xs_close xprt %p\n", xprt);
849
850 xs_reset_transport(transport);
851 xprt->reestablish_timeout = 0;
852
853 xprt_disconnect_done(xprt);
854}
855
856static void xs_inject_disconnect(struct rpc_xprt *xprt)
857{
858 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
859 xprt);
860 xprt_disconnect_done(xprt);
861}
862
863static void xs_xprt_free(struct rpc_xprt *xprt)
864{
865 xs_free_peer_addresses(xprt);
866 xprt_free(xprt);
867}
868
869/**
870 * xs_destroy - prepare to shutdown a transport
871 * @xprt: doomed transport
872 *
873 */
874static void xs_destroy(struct rpc_xprt *xprt)
875{
876 struct sock_xprt *transport = container_of(xprt,
877 struct sock_xprt, xprt);
878 dprintk("RPC: xs_destroy xprt %p\n", xprt);
879
880 cancel_delayed_work_sync(&transport->connect_worker);
881 xs_close(xprt);
882 cancel_work_sync(&transport->recv_worker);
883 xs_xprt_free(xprt);
884 module_put(THIS_MODULE);
885}
886
887static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
888{
889 struct xdr_skb_reader desc = {
890 .skb = skb,
891 .offset = sizeof(rpc_fraghdr),
892 .count = skb->len - sizeof(rpc_fraghdr),
893 };
894
895 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
896 return -1;
897 if (desc.count)
898 return -1;
899 return 0;
900}
901
902/**
903 * xs_local_data_read_skb
904 * @xprt: transport
905 * @sk: socket
906 * @skb: skbuff
907 *
908 * Currently this assumes we can read the whole reply in a single gulp.
909 */
910static void xs_local_data_read_skb(struct rpc_xprt *xprt,
911 struct sock *sk,
912 struct sk_buff *skb)
913{
914 struct rpc_task *task;
915 struct rpc_rqst *rovr;
916 int repsize, copied;
917 u32 _xid;
918 __be32 *xp;
919
920 repsize = skb->len - sizeof(rpc_fraghdr);
921 if (repsize < 4) {
922 dprintk("RPC: impossible RPC reply size %d\n", repsize);
923 return;
924 }
925
926 /* Copy the XID from the skb... */
927 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
928 if (xp == NULL)
929 return;
930
931 /* Look up and lock the request corresponding to the given XID */
932 spin_lock_bh(&xprt->transport_lock);
933 rovr = xprt_lookup_rqst(xprt, *xp);
934 if (!rovr)
935 goto out_unlock;
936 task = rovr->rq_task;
937
938 copied = rovr->rq_private_buf.buflen;
939 if (copied > repsize)
940 copied = repsize;
941
942 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
943 dprintk("RPC: sk_buff copy failed\n");
944 goto out_unlock;
945 }
946
947 xprt_complete_rqst(task, copied);
948
949 out_unlock:
950 spin_unlock_bh(&xprt->transport_lock);
951}
952
953static void xs_local_data_receive(struct sock_xprt *transport)
954{
955 struct sk_buff *skb;
956 struct sock *sk;
957 int err;
958
959 mutex_lock(&transport->recv_mutex);
960 sk = transport->inet;
961 if (sk == NULL)
962 goto out;
963 for (;;) {
964 skb = skb_recv_datagram(sk, 0, 1, &err);
965 if (skb == NULL)
966 break;
967 xs_local_data_read_skb(&transport->xprt, sk, skb);
968 skb_free_datagram(sk, skb);
969 }
970out:
971 mutex_unlock(&transport->recv_mutex);
972}
973
974static void xs_local_data_receive_workfn(struct work_struct *work)
975{
976 struct sock_xprt *transport =
977 container_of(work, struct sock_xprt, recv_worker);
978 xs_local_data_receive(transport);
979}
980
981/**
982 * xs_udp_data_read_skb - receive callback for UDP sockets
983 * @xprt: transport
984 * @sk: socket
985 * @skb: skbuff
986 *
987 */
988static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
989 struct sock *sk,
990 struct sk_buff *skb)
991{
992 struct rpc_task *task;
993 struct rpc_rqst *rovr;
994 int repsize, copied;
995 u32 _xid;
996 __be32 *xp;
997
998 repsize = skb->len - sizeof(struct udphdr);
999 if (repsize < 4) {
1000 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1001 return;
1002 }
1003
1004 /* Copy the XID from the skb... */
1005 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1006 sizeof(_xid), &_xid);
1007 if (xp == NULL)
1008 return;
1009
1010 /* Look up and lock the request corresponding to the given XID */
1011 spin_lock_bh(&xprt->transport_lock);
1012 rovr = xprt_lookup_rqst(xprt, *xp);
1013 if (!rovr)
1014 goto out_unlock;
1015 task = rovr->rq_task;
1016
1017 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1018 copied = repsize;
1019
1020 /* Suck it into the iovec, verify checksum if not done by hw. */
1021 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1022 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1023 goto out_unlock;
1024 }
1025
1026 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1027
1028 xprt_adjust_cwnd(xprt, task, copied);
1029 xprt_complete_rqst(task, copied);
1030
1031 out_unlock:
1032 spin_unlock_bh(&xprt->transport_lock);
1033}
1034
1035static void xs_udp_data_receive(struct sock_xprt *transport)
1036{
1037 struct sk_buff *skb;
1038 struct sock *sk;
1039 int err;
1040
1041 mutex_lock(&transport->recv_mutex);
1042 sk = transport->inet;
1043 if (sk == NULL)
1044 goto out;
1045 for (;;) {
1046 skb = skb_recv_datagram(sk, 0, 1, &err);
1047 if (skb == NULL)
1048 break;
1049 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1050 skb_free_datagram(sk, skb);
1051 }
1052out:
1053 mutex_unlock(&transport->recv_mutex);
1054}
1055
1056static void xs_udp_data_receive_workfn(struct work_struct *work)
1057{
1058 struct sock_xprt *transport =
1059 container_of(work, struct sock_xprt, recv_worker);
1060 xs_udp_data_receive(transport);
1061}
1062
1063/**
1064 * xs_data_ready - "data ready" callback for UDP sockets
1065 * @sk: socket with data to read
1066 *
1067 */
1068static void xs_data_ready(struct sock *sk)
1069{
1070 struct rpc_xprt *xprt;
1071
1072 read_lock_bh(&sk->sk_callback_lock);
1073 dprintk("RPC: xs_data_ready...\n");
1074 xprt = xprt_from_sock(sk);
1075 if (xprt != NULL) {
1076 struct sock_xprt *transport = container_of(xprt,
1077 struct sock_xprt, xprt);
1078 queue_work(rpciod_workqueue, &transport->recv_worker);
1079 }
1080 read_unlock_bh(&sk->sk_callback_lock);
1081}
1082
1083/*
1084 * Helper function to force a TCP close if the server is sending
1085 * junk and/or it has put us in CLOSE_WAIT
1086 */
1087static void xs_tcp_force_close(struct rpc_xprt *xprt)
1088{
1089 xprt_force_disconnect(xprt);
1090}
1091
1092static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1093{
1094 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1095 size_t len, used;
1096 char *p;
1097
1098 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1099 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1100 used = xdr_skb_read_bits(desc, p, len);
1101 transport->tcp_offset += used;
1102 if (used != len)
1103 return;
1104
1105 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1106 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1107 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1108 else
1109 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1110 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1111
1112 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1113 transport->tcp_offset = 0;
1114
1115 /* Sanity check of the record length */
1116 if (unlikely(transport->tcp_reclen < 8)) {
1117 dprintk("RPC: invalid TCP record fragment length\n");
1118 xs_tcp_force_close(xprt);
1119 return;
1120 }
1121 dprintk("RPC: reading TCP record fragment of length %d\n",
1122 transport->tcp_reclen);
1123}
1124
1125static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1126{
1127 if (transport->tcp_offset == transport->tcp_reclen) {
1128 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1129 transport->tcp_offset = 0;
1130 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1131 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1132 transport->tcp_flags |= TCP_RCV_COPY_XID;
1133 transport->tcp_copied = 0;
1134 }
1135 }
1136}
1137
1138static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1139{
1140 size_t len, used;
1141 char *p;
1142
1143 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1144 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1145 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1146 used = xdr_skb_read_bits(desc, p, len);
1147 transport->tcp_offset += used;
1148 if (used != len)
1149 return;
1150 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1151 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1152 transport->tcp_copied = 4;
1153 dprintk("RPC: reading %s XID %08x\n",
1154 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1155 : "request with",
1156 ntohl(transport->tcp_xid));
1157 xs_tcp_check_fraghdr(transport);
1158}
1159
1160static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1161 struct xdr_skb_reader *desc)
1162{
1163 size_t len, used;
1164 u32 offset;
1165 char *p;
1166
1167 /*
1168 * We want transport->tcp_offset to be 8 at the end of this routine
1169 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1170 * When this function is called for the first time,
1171 * transport->tcp_offset is 4 (after having already read the xid).
1172 */
1173 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1174 len = sizeof(transport->tcp_calldir) - offset;
1175 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1176 p = ((char *) &transport->tcp_calldir) + offset;
1177 used = xdr_skb_read_bits(desc, p, len);
1178 transport->tcp_offset += used;
1179 if (used != len)
1180 return;
1181 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1182 /*
1183 * We don't yet have the XDR buffer, so we will write the calldir
1184 * out after we get the buffer from the 'struct rpc_rqst'
1185 */
1186 switch (ntohl(transport->tcp_calldir)) {
1187 case RPC_REPLY:
1188 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1189 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1190 transport->tcp_flags |= TCP_RPC_REPLY;
1191 break;
1192 case RPC_CALL:
1193 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1194 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1195 transport->tcp_flags &= ~TCP_RPC_REPLY;
1196 break;
1197 default:
1198 dprintk("RPC: invalid request message type\n");
1199 xs_tcp_force_close(&transport->xprt);
1200 }
1201 xs_tcp_check_fraghdr(transport);
1202}
1203
1204static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1205 struct xdr_skb_reader *desc,
1206 struct rpc_rqst *req)
1207{
1208 struct sock_xprt *transport =
1209 container_of(xprt, struct sock_xprt, xprt);
1210 struct xdr_buf *rcvbuf;
1211 size_t len;
1212 ssize_t r;
1213
1214 rcvbuf = &req->rq_private_buf;
1215
1216 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1217 /*
1218 * Save the RPC direction in the XDR buffer
1219 */
1220 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1221 &transport->tcp_calldir,
1222 sizeof(transport->tcp_calldir));
1223 transport->tcp_copied += sizeof(transport->tcp_calldir);
1224 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1225 }
1226
1227 len = desc->count;
1228 if (len > transport->tcp_reclen - transport->tcp_offset) {
1229 struct xdr_skb_reader my_desc;
1230
1231 len = transport->tcp_reclen - transport->tcp_offset;
1232 memcpy(&my_desc, desc, sizeof(my_desc));
1233 my_desc.count = len;
1234 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1235 &my_desc, xdr_skb_read_bits);
1236 desc->count -= r;
1237 desc->offset += r;
1238 } else
1239 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1240 desc, xdr_skb_read_bits);
1241
1242 if (r > 0) {
1243 transport->tcp_copied += r;
1244 transport->tcp_offset += r;
1245 }
1246 if (r != len) {
1247 /* Error when copying to the receive buffer,
1248 * usually because we weren't able to allocate
1249 * additional buffer pages. All we can do now
1250 * is turn off TCP_RCV_COPY_DATA, so the request
1251 * will not receive any additional updates,
1252 * and time out.
1253 * Any remaining data from this record will
1254 * be discarded.
1255 */
1256 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1257 dprintk("RPC: XID %08x truncated request\n",
1258 ntohl(transport->tcp_xid));
1259 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1260 "tcp_offset = %u, tcp_reclen = %u\n",
1261 xprt, transport->tcp_copied,
1262 transport->tcp_offset, transport->tcp_reclen);
1263 return;
1264 }
1265
1266 dprintk("RPC: XID %08x read %Zd bytes\n",
1267 ntohl(transport->tcp_xid), r);
1268 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1269 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1270 transport->tcp_offset, transport->tcp_reclen);
1271
1272 if (transport->tcp_copied == req->rq_private_buf.buflen)
1273 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1274 else if (transport->tcp_offset == transport->tcp_reclen) {
1275 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1276 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1277 }
1278}
1279
1280/*
1281 * Finds the request corresponding to the RPC xid and invokes the common
1282 * tcp read code to read the data.
1283 */
1284static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1285 struct xdr_skb_reader *desc)
1286{
1287 struct sock_xprt *transport =
1288 container_of(xprt, struct sock_xprt, xprt);
1289 struct rpc_rqst *req;
1290
1291 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1292
1293 /* Find and lock the request corresponding to this xid */
1294 spin_lock_bh(&xprt->transport_lock);
1295 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1296 if (!req) {
1297 dprintk("RPC: XID %08x request not found!\n",
1298 ntohl(transport->tcp_xid));
1299 spin_unlock_bh(&xprt->transport_lock);
1300 return -1;
1301 }
1302
1303 xs_tcp_read_common(xprt, desc, req);
1304
1305 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1306 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1307
1308 spin_unlock_bh(&xprt->transport_lock);
1309 return 0;
1310}
1311
1312#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1313/*
1314 * Obtains an rpc_rqst previously allocated and invokes the common
1315 * tcp read code to read the data. The result is placed in the callback
1316 * queue.
1317 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1318 * connection and return -1.
1319 */
1320static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1321 struct xdr_skb_reader *desc)
1322{
1323 struct sock_xprt *transport =
1324 container_of(xprt, struct sock_xprt, xprt);
1325 struct rpc_rqst *req;
1326
1327 /* Look up and lock the request corresponding to the given XID */
1328 spin_lock_bh(&xprt->transport_lock);
1329 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1330 if (req == NULL) {
1331 spin_unlock_bh(&xprt->transport_lock);
1332 printk(KERN_WARNING "Callback slot table overflowed\n");
1333 xprt_force_disconnect(xprt);
1334 return -1;
1335 }
1336
1337 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1338 xs_tcp_read_common(xprt, desc, req);
1339
1340 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1341 xprt_complete_bc_request(req, transport->tcp_copied);
1342 spin_unlock_bh(&xprt->transport_lock);
1343
1344 return 0;
1345}
1346
1347static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1348 struct xdr_skb_reader *desc)
1349{
1350 struct sock_xprt *transport =
1351 container_of(xprt, struct sock_xprt, xprt);
1352
1353 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1354 xs_tcp_read_reply(xprt, desc) :
1355 xs_tcp_read_callback(xprt, desc);
1356}
1357
1358static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1359{
1360 int ret;
1361
1362 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1363 SVC_SOCK_ANONYMOUS);
1364 if (ret < 0)
1365 return ret;
1366 return 0;
1367}
1368#else
1369static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1370 struct xdr_skb_reader *desc)
1371{
1372 return xs_tcp_read_reply(xprt, desc);
1373}
1374#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1375
1376/*
1377 * Read data off the transport. This can be either an RPC_CALL or an
1378 * RPC_REPLY. Relay the processing to helper functions.
1379 */
1380static void xs_tcp_read_data(struct rpc_xprt *xprt,
1381 struct xdr_skb_reader *desc)
1382{
1383 struct sock_xprt *transport =
1384 container_of(xprt, struct sock_xprt, xprt);
1385
1386 if (_xs_tcp_read_data(xprt, desc) == 0)
1387 xs_tcp_check_fraghdr(transport);
1388 else {
1389 /*
1390 * The transport_lock protects the request handling.
1391 * There's no need to hold it to update the tcp_flags.
1392 */
1393 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1394 }
1395}
1396
1397static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1398{
1399 size_t len;
1400
1401 len = transport->tcp_reclen - transport->tcp_offset;
1402 if (len > desc->count)
1403 len = desc->count;
1404 desc->count -= len;
1405 desc->offset += len;
1406 transport->tcp_offset += len;
1407 dprintk("RPC: discarded %Zu bytes\n", len);
1408 xs_tcp_check_fraghdr(transport);
1409}
1410
1411static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1412{
1413 struct rpc_xprt *xprt = rd_desc->arg.data;
1414 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1415 struct xdr_skb_reader desc = {
1416 .skb = skb,
1417 .offset = offset,
1418 .count = len,
1419 };
1420
1421 dprintk("RPC: xs_tcp_data_recv started\n");
1422 do {
1423 trace_xs_tcp_data_recv(transport);
1424 /* Read in a new fragment marker if necessary */
1425 /* Can we ever really expect to get completely empty fragments? */
1426 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1427 xs_tcp_read_fraghdr(xprt, &desc);
1428 continue;
1429 }
1430 /* Read in the xid if necessary */
1431 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1432 xs_tcp_read_xid(transport, &desc);
1433 continue;
1434 }
1435 /* Read in the call/reply flag */
1436 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1437 xs_tcp_read_calldir(transport, &desc);
1438 continue;
1439 }
1440 /* Read in the request data */
1441 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1442 xs_tcp_read_data(xprt, &desc);
1443 continue;
1444 }
1445 /* Skip over any trailing bytes on short reads */
1446 xs_tcp_read_discard(transport, &desc);
1447 } while (desc.count);
1448 trace_xs_tcp_data_recv(transport);
1449 dprintk("RPC: xs_tcp_data_recv done\n");
1450 return len - desc.count;
1451}
1452
1453static void xs_tcp_data_receive(struct sock_xprt *transport)
1454{
1455 struct rpc_xprt *xprt = &transport->xprt;
1456 struct sock *sk;
1457 read_descriptor_t rd_desc = {
1458 .count = 2*1024*1024,
1459 .arg.data = xprt,
1460 };
1461 unsigned long total = 0;
1462 int read = 0;
1463
1464 mutex_lock(&transport->recv_mutex);
1465 sk = transport->inet;
1466 if (sk == NULL)
1467 goto out;
1468
1469 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1470 for (;;) {
1471 lock_sock(sk);
1472 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1473 release_sock(sk);
1474 if (read <= 0)
1475 break;
1476 total += read;
1477 rd_desc.count = 65536;
1478 }
1479out:
1480 mutex_unlock(&transport->recv_mutex);
1481 trace_xs_tcp_data_ready(xprt, read, total);
1482}
1483
1484static void xs_tcp_data_receive_workfn(struct work_struct *work)
1485{
1486 struct sock_xprt *transport =
1487 container_of(work, struct sock_xprt, recv_worker);
1488 xs_tcp_data_receive(transport);
1489}
1490
1491/**
1492 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1493 * @sk: socket with data to read
1494 *
1495 */
1496static void xs_tcp_data_ready(struct sock *sk)
1497{
1498 struct sock_xprt *transport;
1499 struct rpc_xprt *xprt;
1500
1501 dprintk("RPC: xs_tcp_data_ready...\n");
1502
1503 read_lock_bh(&sk->sk_callback_lock);
1504 if (!(xprt = xprt_from_sock(sk)))
1505 goto out;
1506 transport = container_of(xprt, struct sock_xprt, xprt);
1507
1508 /* Any data means we had a useful conversation, so
1509 * the we don't need to delay the next reconnect
1510 */
1511 if (xprt->reestablish_timeout)
1512 xprt->reestablish_timeout = 0;
1513 queue_work(rpciod_workqueue, &transport->recv_worker);
1514
1515out:
1516 read_unlock_bh(&sk->sk_callback_lock);
1517}
1518
1519/**
1520 * xs_tcp_state_change - callback to handle TCP socket state changes
1521 * @sk: socket whose state has changed
1522 *
1523 */
1524static void xs_tcp_state_change(struct sock *sk)
1525{
1526 struct rpc_xprt *xprt;
1527 struct sock_xprt *transport;
1528
1529 read_lock_bh(&sk->sk_callback_lock);
1530 if (!(xprt = xprt_from_sock(sk)))
1531 goto out;
1532 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1533 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1534 sk->sk_state, xprt_connected(xprt),
1535 sock_flag(sk, SOCK_DEAD),
1536 sock_flag(sk, SOCK_ZAPPED),
1537 sk->sk_shutdown);
1538
1539 transport = container_of(xprt, struct sock_xprt, xprt);
1540 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1541 switch (sk->sk_state) {
1542 case TCP_ESTABLISHED:
1543 spin_lock(&xprt->transport_lock);
1544 if (!xprt_test_and_set_connected(xprt)) {
1545
1546 /* Reset TCP record info */
1547 transport->tcp_offset = 0;
1548 transport->tcp_reclen = 0;
1549 transport->tcp_copied = 0;
1550 transport->tcp_flags =
1551 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1552 xprt->connect_cookie++;
1553 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1554 xprt_clear_connecting(xprt);
1555
1556 xprt_wake_pending_tasks(xprt, -EAGAIN);
1557 }
1558 spin_unlock(&xprt->transport_lock);
1559 break;
1560 case TCP_FIN_WAIT1:
1561 /* The client initiated a shutdown of the socket */
1562 xprt->connect_cookie++;
1563 xprt->reestablish_timeout = 0;
1564 set_bit(XPRT_CLOSING, &xprt->state);
1565 smp_mb__before_atomic();
1566 clear_bit(XPRT_CONNECTED, &xprt->state);
1567 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1568 smp_mb__after_atomic();
1569 break;
1570 case TCP_CLOSE_WAIT:
1571 /* The server initiated a shutdown of the socket */
1572 xprt->connect_cookie++;
1573 clear_bit(XPRT_CONNECTED, &xprt->state);
1574 xs_tcp_force_close(xprt);
1575 case TCP_CLOSING:
1576 /*
1577 * If the server closed down the connection, make sure that
1578 * we back off before reconnecting
1579 */
1580 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1581 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1582 break;
1583 case TCP_LAST_ACK:
1584 set_bit(XPRT_CLOSING, &xprt->state);
1585 smp_mb__before_atomic();
1586 clear_bit(XPRT_CONNECTED, &xprt->state);
1587 smp_mb__after_atomic();
1588 break;
1589 case TCP_CLOSE:
1590 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1591 &transport->sock_state))
1592 xprt_clear_connecting(xprt);
1593 xs_sock_mark_closed(xprt);
1594 }
1595 out:
1596 read_unlock_bh(&sk->sk_callback_lock);
1597}
1598
1599static void xs_write_space(struct sock *sk)
1600{
1601 struct socket_wq *wq;
1602 struct rpc_xprt *xprt;
1603
1604 if (!sk->sk_socket)
1605 return;
1606 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1607
1608 if (unlikely(!(xprt = xprt_from_sock(sk))))
1609 return;
1610 rcu_read_lock();
1611 wq = rcu_dereference(sk->sk_wq);
1612 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1613 goto out;
1614
1615 xprt_write_space(xprt);
1616out:
1617 rcu_read_unlock();
1618}
1619
1620/**
1621 * xs_udp_write_space - callback invoked when socket buffer space
1622 * becomes available
1623 * @sk: socket whose state has changed
1624 *
1625 * Called when more output buffer space is available for this socket.
1626 * We try not to wake our writers until they can make "significant"
1627 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1628 * with a bunch of small requests.
1629 */
1630static void xs_udp_write_space(struct sock *sk)
1631{
1632 read_lock_bh(&sk->sk_callback_lock);
1633
1634 /* from net/core/sock.c:sock_def_write_space */
1635 if (sock_writeable(sk))
1636 xs_write_space(sk);
1637
1638 read_unlock_bh(&sk->sk_callback_lock);
1639}
1640
1641/**
1642 * xs_tcp_write_space - callback invoked when socket buffer space
1643 * becomes available
1644 * @sk: socket whose state has changed
1645 *
1646 * Called when more output buffer space is available for this socket.
1647 * We try not to wake our writers until they can make "significant"
1648 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1649 * with a bunch of small requests.
1650 */
1651static void xs_tcp_write_space(struct sock *sk)
1652{
1653 read_lock_bh(&sk->sk_callback_lock);
1654
1655 /* from net/core/stream.c:sk_stream_write_space */
1656 if (sk_stream_is_writeable(sk))
1657 xs_write_space(sk);
1658
1659 read_unlock_bh(&sk->sk_callback_lock);
1660}
1661
1662static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1663{
1664 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1665 struct sock *sk = transport->inet;
1666
1667 if (transport->rcvsize) {
1668 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1669 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1670 }
1671 if (transport->sndsize) {
1672 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1673 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1674 sk->sk_write_space(sk);
1675 }
1676}
1677
1678/**
1679 * xs_udp_set_buffer_size - set send and receive limits
1680 * @xprt: generic transport
1681 * @sndsize: requested size of send buffer, in bytes
1682 * @rcvsize: requested size of receive buffer, in bytes
1683 *
1684 * Set socket send and receive buffer size limits.
1685 */
1686static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1687{
1688 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1689
1690 transport->sndsize = 0;
1691 if (sndsize)
1692 transport->sndsize = sndsize + 1024;
1693 transport->rcvsize = 0;
1694 if (rcvsize)
1695 transport->rcvsize = rcvsize + 1024;
1696
1697 xs_udp_do_set_buffer_size(xprt);
1698}
1699
1700/**
1701 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1702 * @task: task that timed out
1703 *
1704 * Adjust the congestion window after a retransmit timeout has occurred.
1705 */
1706static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1707{
1708 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1709}
1710
1711static unsigned short xs_get_random_port(void)
1712{
1713 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1714 unsigned short rand = (unsigned short) prandom_u32() % range;
1715 return rand + xprt_min_resvport;
1716}
1717
1718/**
1719 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1720 * @sock: socket
1721 *
1722 * Note that this function has to be called on all sockets that share the
1723 * same port, and it must be called before binding.
1724 */
1725static void xs_sock_set_reuseport(struct socket *sock)
1726{
1727 int opt = 1;
1728
1729 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1730 (char *)&opt, sizeof(opt));
1731}
1732
1733static unsigned short xs_sock_getport(struct socket *sock)
1734{
1735 struct sockaddr_storage buf;
1736 int buflen;
1737 unsigned short port = 0;
1738
1739 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1740 goto out;
1741 switch (buf.ss_family) {
1742 case AF_INET6:
1743 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1744 break;
1745 case AF_INET:
1746 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1747 }
1748out:
1749 return port;
1750}
1751
1752/**
1753 * xs_set_port - reset the port number in the remote endpoint address
1754 * @xprt: generic transport
1755 * @port: new port number
1756 *
1757 */
1758static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1759{
1760 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1761
1762 rpc_set_port(xs_addr(xprt), port);
1763 xs_update_peer_port(xprt);
1764}
1765
1766static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1767{
1768 if (transport->srcport == 0)
1769 transport->srcport = xs_sock_getport(sock);
1770}
1771
1772static unsigned short xs_get_srcport(struct sock_xprt *transport)
1773{
1774 unsigned short port = transport->srcport;
1775
1776 if (port == 0 && transport->xprt.resvport)
1777 port = xs_get_random_port();
1778 return port;
1779}
1780
1781static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1782{
1783 if (transport->srcport != 0)
1784 transport->srcport = 0;
1785 if (!transport->xprt.resvport)
1786 return 0;
1787 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1788 return xprt_max_resvport;
1789 return --port;
1790}
1791static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1792{
1793 struct sockaddr_storage myaddr;
1794 int err, nloop = 0;
1795 unsigned short port = xs_get_srcport(transport);
1796 unsigned short last;
1797
1798 /*
1799 * If we are asking for any ephemeral port (i.e. port == 0 &&
1800 * transport->xprt.resvport == 0), don't bind. Let the local
1801 * port selection happen implicitly when the socket is used
1802 * (for example at connect time).
1803 *
1804 * This ensures that we can continue to establish TCP
1805 * connections even when all local ephemeral ports are already
1806 * a part of some TCP connection. This makes no difference
1807 * for UDP sockets, but also doens't harm them.
1808 *
1809 * If we're asking for any reserved port (i.e. port == 0 &&
1810 * transport->xprt.resvport == 1) xs_get_srcport above will
1811 * ensure that port is non-zero and we will bind as needed.
1812 */
1813 if (port == 0)
1814 return 0;
1815
1816 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1817 do {
1818 rpc_set_port((struct sockaddr *)&myaddr, port);
1819 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1820 transport->xprt.addrlen);
1821 if (err == 0) {
1822 transport->srcport = port;
1823 break;
1824 }
1825 last = port;
1826 port = xs_next_srcport(transport, port);
1827 if (port > last)
1828 nloop++;
1829 } while (err == -EADDRINUSE && nloop != 2);
1830
1831 if (myaddr.ss_family == AF_INET)
1832 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1833 &((struct sockaddr_in *)&myaddr)->sin_addr,
1834 port, err ? "failed" : "ok", err);
1835 else
1836 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1837 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1838 port, err ? "failed" : "ok", err);
1839 return err;
1840}
1841
1842/*
1843 * We don't support autobind on AF_LOCAL sockets
1844 */
1845static void xs_local_rpcbind(struct rpc_task *task)
1846{
1847 xprt_set_bound(task->tk_xprt);
1848}
1849
1850static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1851{
1852}
1853
1854#ifdef CONFIG_DEBUG_LOCK_ALLOC
1855static struct lock_class_key xs_key[2];
1856static struct lock_class_key xs_slock_key[2];
1857
1858static inline void xs_reclassify_socketu(struct socket *sock)
1859{
1860 struct sock *sk = sock->sk;
1861
1862 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1863 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1864}
1865
1866static inline void xs_reclassify_socket4(struct socket *sock)
1867{
1868 struct sock *sk = sock->sk;
1869
1870 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1871 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1872}
1873
1874static inline void xs_reclassify_socket6(struct socket *sock)
1875{
1876 struct sock *sk = sock->sk;
1877
1878 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1879 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1880}
1881
1882static inline void xs_reclassify_socket(int family, struct socket *sock)
1883{
1884 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1885 if (sock_owned_by_user(sock->sk))
1886 return;
1887
1888 switch (family) {
1889 case AF_LOCAL:
1890 xs_reclassify_socketu(sock);
1891 break;
1892 case AF_INET:
1893 xs_reclassify_socket4(sock);
1894 break;
1895 case AF_INET6:
1896 xs_reclassify_socket6(sock);
1897 break;
1898 }
1899}
1900#else
1901static inline void xs_reclassify_socket(int family, struct socket *sock)
1902{
1903}
1904#endif
1905
1906static void xs_dummy_setup_socket(struct work_struct *work)
1907{
1908}
1909
1910static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1911 struct sock_xprt *transport, int family, int type,
1912 int protocol, bool reuseport)
1913{
1914 struct socket *sock;
1915 int err;
1916
1917 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1918 if (err < 0) {
1919 dprintk("RPC: can't create %d transport socket (%d).\n",
1920 protocol, -err);
1921 goto out;
1922 }
1923 xs_reclassify_socket(family, sock);
1924
1925 if (reuseport)
1926 xs_sock_set_reuseport(sock);
1927
1928 err = xs_bind(transport, sock);
1929 if (err) {
1930 sock_release(sock);
1931 goto out;
1932 }
1933
1934 return sock;
1935out:
1936 return ERR_PTR(err);
1937}
1938
1939static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1940 struct socket *sock)
1941{
1942 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1943 xprt);
1944
1945 if (!transport->inet) {
1946 struct sock *sk = sock->sk;
1947
1948 write_lock_bh(&sk->sk_callback_lock);
1949
1950 xs_save_old_callbacks(transport, sk);
1951
1952 sk->sk_user_data = xprt;
1953 sk->sk_data_ready = xs_data_ready;
1954 sk->sk_write_space = xs_udp_write_space;
1955 sk->sk_error_report = xs_error_report;
1956 sk->sk_allocation = GFP_NOIO;
1957
1958 xprt_clear_connected(xprt);
1959
1960 /* Reset to new socket */
1961 transport->sock = sock;
1962 transport->inet = sk;
1963
1964 write_unlock_bh(&sk->sk_callback_lock);
1965 }
1966
1967 /* Tell the socket layer to start connecting... */
1968 xprt->stat.connect_count++;
1969 xprt->stat.connect_start = jiffies;
1970 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1971}
1972
1973/**
1974 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1975 * @transport: socket transport to connect
1976 */
1977static int xs_local_setup_socket(struct sock_xprt *transport)
1978{
1979 struct rpc_xprt *xprt = &transport->xprt;
1980 struct socket *sock;
1981 int status = -EIO;
1982
1983 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1984 SOCK_STREAM, 0, &sock, 1);
1985 if (status < 0) {
1986 dprintk("RPC: can't create AF_LOCAL "
1987 "transport socket (%d).\n", -status);
1988 goto out;
1989 }
1990 xs_reclassify_socket(AF_LOCAL, sock);
1991
1992 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1993 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1994
1995 status = xs_local_finish_connecting(xprt, sock);
1996 trace_rpc_socket_connect(xprt, sock, status);
1997 switch (status) {
1998 case 0:
1999 dprintk("RPC: xprt %p connected to %s\n",
2000 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2001 xprt_set_connected(xprt);
2002 case -ENOBUFS:
2003 break;
2004 case -ENOENT:
2005 dprintk("RPC: xprt %p: socket %s does not exist\n",
2006 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2007 break;
2008 case -ECONNREFUSED:
2009 dprintk("RPC: xprt %p: connection refused for %s\n",
2010 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2011 break;
2012 default:
2013 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2014 __func__, -status,
2015 xprt->address_strings[RPC_DISPLAY_ADDR]);
2016 }
2017
2018out:
2019 xprt_clear_connecting(xprt);
2020 xprt_wake_pending_tasks(xprt, status);
2021 return status;
2022}
2023
2024static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2025{
2026 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2027 int ret;
2028
2029 if (RPC_IS_ASYNC(task)) {
2030 /*
2031 * We want the AF_LOCAL connect to be resolved in the
2032 * filesystem namespace of the process making the rpc
2033 * call. Thus we connect synchronously.
2034 *
2035 * If we want to support asynchronous AF_LOCAL calls,
2036 * we'll need to figure out how to pass a namespace to
2037 * connect.
2038 */
2039 rpc_exit(task, -ENOTCONN);
2040 return;
2041 }
2042 ret = xs_local_setup_socket(transport);
2043 if (ret && !RPC_IS_SOFTCONN(task))
2044 msleep_interruptible(15000);
2045}
2046
2047#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2048/*
2049 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2050 * know that we have exclusive access to the socket), to guard against
2051 * races with xs_reset_transport.
2052 */
2053static void xs_set_memalloc(struct rpc_xprt *xprt)
2054{
2055 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2056 xprt);
2057
2058 /*
2059 * If there's no sock, then we have nothing to set. The
2060 * reconnecting process will get it for us.
2061 */
2062 if (!transport->inet)
2063 return;
2064 if (atomic_read(&xprt->swapper))
2065 sk_set_memalloc(transport->inet);
2066}
2067
2068/**
2069 * xs_enable_swap - Tag this transport as being used for swap.
2070 * @xprt: transport to tag
2071 *
2072 * Take a reference to this transport on behalf of the rpc_clnt, and
2073 * optionally mark it for swapping if it wasn't already.
2074 */
2075static int
2076xs_enable_swap(struct rpc_xprt *xprt)
2077{
2078 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2079
2080 if (atomic_inc_return(&xprt->swapper) != 1)
2081 return 0;
2082 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2083 return -ERESTARTSYS;
2084 if (xs->inet)
2085 sk_set_memalloc(xs->inet);
2086 xprt_release_xprt(xprt, NULL);
2087 return 0;
2088}
2089
2090/**
2091 * xs_disable_swap - Untag this transport as being used for swap.
2092 * @xprt: transport to tag
2093 *
2094 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2095 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2096 */
2097static void
2098xs_disable_swap(struct rpc_xprt *xprt)
2099{
2100 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2101
2102 if (!atomic_dec_and_test(&xprt->swapper))
2103 return;
2104 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2105 return;
2106 if (xs->inet)
2107 sk_clear_memalloc(xs->inet);
2108 xprt_release_xprt(xprt, NULL);
2109}
2110#else
2111static void xs_set_memalloc(struct rpc_xprt *xprt)
2112{
2113}
2114
2115static int
2116xs_enable_swap(struct rpc_xprt *xprt)
2117{
2118 return -EINVAL;
2119}
2120
2121static void
2122xs_disable_swap(struct rpc_xprt *xprt)
2123{
2124}
2125#endif
2126
2127static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2128{
2129 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2130
2131 if (!transport->inet) {
2132 struct sock *sk = sock->sk;
2133
2134 write_lock_bh(&sk->sk_callback_lock);
2135
2136 xs_save_old_callbacks(transport, sk);
2137
2138 sk->sk_user_data = xprt;
2139 sk->sk_data_ready = xs_data_ready;
2140 sk->sk_write_space = xs_udp_write_space;
2141 sk->sk_allocation = GFP_NOIO;
2142
2143 xprt_set_connected(xprt);
2144
2145 /* Reset to new socket */
2146 transport->sock = sock;
2147 transport->inet = sk;
2148
2149 xs_set_memalloc(xprt);
2150
2151 write_unlock_bh(&sk->sk_callback_lock);
2152 }
2153 xs_udp_do_set_buffer_size(xprt);
2154}
2155
2156static void xs_udp_setup_socket(struct work_struct *work)
2157{
2158 struct sock_xprt *transport =
2159 container_of(work, struct sock_xprt, connect_worker.work);
2160 struct rpc_xprt *xprt = &transport->xprt;
2161 struct socket *sock = transport->sock;
2162 int status = -EIO;
2163
2164 sock = xs_create_sock(xprt, transport,
2165 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2166 IPPROTO_UDP, false);
2167 if (IS_ERR(sock))
2168 goto out;
2169
2170 dprintk("RPC: worker connecting xprt %p via %s to "
2171 "%s (port %s)\n", xprt,
2172 xprt->address_strings[RPC_DISPLAY_PROTO],
2173 xprt->address_strings[RPC_DISPLAY_ADDR],
2174 xprt->address_strings[RPC_DISPLAY_PORT]);
2175
2176 xs_udp_finish_connecting(xprt, sock);
2177 trace_rpc_socket_connect(xprt, sock, 0);
2178 status = 0;
2179out:
2180 xprt_unlock_connect(xprt, transport);
2181 xprt_clear_connecting(xprt);
2182 xprt_wake_pending_tasks(xprt, status);
2183}
2184
2185/**
2186 * xs_tcp_shutdown - gracefully shut down a TCP socket
2187 * @xprt: transport
2188 *
2189 * Initiates a graceful shutdown of the TCP socket by calling the
2190 * equivalent of shutdown(SHUT_RDWR);
2191 */
2192static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2193{
2194 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2195 struct socket *sock = transport->sock;
2196
2197 if (sock == NULL)
2198 return;
2199 if (xprt_connected(xprt)) {
2200 kernel_sock_shutdown(sock, SHUT_RDWR);
2201 trace_rpc_socket_shutdown(xprt, sock);
2202 } else
2203 xs_reset_transport(transport);
2204}
2205
2206static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2207{
2208 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2209 int ret = -ENOTCONN;
2210
2211 if (!transport->inet) {
2212 struct sock *sk = sock->sk;
2213 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2214 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2215 unsigned int opt_on = 1;
2216 unsigned int timeo;
2217
2218 /* TCP Keepalive options */
2219 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2220 (char *)&opt_on, sizeof(opt_on));
2221 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2222 (char *)&keepidle, sizeof(keepidle));
2223 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2224 (char *)&keepidle, sizeof(keepidle));
2225 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2226 (char *)&keepcnt, sizeof(keepcnt));
2227
2228 /* TCP user timeout (see RFC5482) */
2229 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2230 (xprt->timeout->to_retries + 1);
2231 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2232 (char *)&timeo, sizeof(timeo));
2233
2234 write_lock_bh(&sk->sk_callback_lock);
2235
2236 xs_save_old_callbacks(transport, sk);
2237
2238 sk->sk_user_data = xprt;
2239 sk->sk_data_ready = xs_tcp_data_ready;
2240 sk->sk_state_change = xs_tcp_state_change;
2241 sk->sk_write_space = xs_tcp_write_space;
2242 sk->sk_error_report = xs_error_report;
2243 sk->sk_allocation = GFP_NOIO;
2244
2245 /* socket options */
2246 sock_reset_flag(sk, SOCK_LINGER);
2247 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2248
2249 xprt_clear_connected(xprt);
2250
2251 /* Reset to new socket */
2252 transport->sock = sock;
2253 transport->inet = sk;
2254
2255 write_unlock_bh(&sk->sk_callback_lock);
2256 }
2257
2258 if (!xprt_bound(xprt))
2259 goto out;
2260
2261 xs_set_memalloc(xprt);
2262
2263 /* Tell the socket layer to start connecting... */
2264 xprt->stat.connect_count++;
2265 xprt->stat.connect_start = jiffies;
2266 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2267 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2268 switch (ret) {
2269 case 0:
2270 xs_set_srcport(transport, sock);
2271 case -EINPROGRESS:
2272 /* SYN_SENT! */
2273 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2274 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2275 }
2276out:
2277 return ret;
2278}
2279
2280/**
2281 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2282 *
2283 * Invoked by a work queue tasklet.
2284 */
2285static void xs_tcp_setup_socket(struct work_struct *work)
2286{
2287 struct sock_xprt *transport =
2288 container_of(work, struct sock_xprt, connect_worker.work);
2289 struct socket *sock = transport->sock;
2290 struct rpc_xprt *xprt = &transport->xprt;
2291 int status = -EIO;
2292
2293 if (!sock) {
2294 sock = xs_create_sock(xprt, transport,
2295 xs_addr(xprt)->sa_family, SOCK_STREAM,
2296 IPPROTO_TCP, true);
2297 if (IS_ERR(sock)) {
2298 status = PTR_ERR(sock);
2299 goto out;
2300 }
2301 }
2302
2303 dprintk("RPC: worker connecting xprt %p via %s to "
2304 "%s (port %s)\n", xprt,
2305 xprt->address_strings[RPC_DISPLAY_PROTO],
2306 xprt->address_strings[RPC_DISPLAY_ADDR],
2307 xprt->address_strings[RPC_DISPLAY_PORT]);
2308
2309 status = xs_tcp_finish_connecting(xprt, sock);
2310 trace_rpc_socket_connect(xprt, sock, status);
2311 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2312 xprt, -status, xprt_connected(xprt),
2313 sock->sk->sk_state);
2314 switch (status) {
2315 default:
2316 printk("%s: connect returned unhandled error %d\n",
2317 __func__, status);
2318 case -EADDRNOTAVAIL:
2319 /* We're probably in TIME_WAIT. Get rid of existing socket,
2320 * and retry
2321 */
2322 xs_tcp_force_close(xprt);
2323 break;
2324 case 0:
2325 case -EINPROGRESS:
2326 case -EALREADY:
2327 xprt_unlock_connect(xprt, transport);
2328 return;
2329 case -EINVAL:
2330 /* Happens, for instance, if the user specified a link
2331 * local IPv6 address without a scope-id.
2332 */
2333 case -ECONNREFUSED:
2334 case -ECONNRESET:
2335 case -ENETUNREACH:
2336 case -EADDRINUSE:
2337 case -ENOBUFS:
2338 /* retry with existing socket, after a delay */
2339 xs_tcp_force_close(xprt);
2340 goto out;
2341 }
2342 status = -EAGAIN;
2343out:
2344 xprt_unlock_connect(xprt, transport);
2345 xprt_clear_connecting(xprt);
2346 xprt_wake_pending_tasks(xprt, status);
2347}
2348
2349/**
2350 * xs_connect - connect a socket to a remote endpoint
2351 * @xprt: pointer to transport structure
2352 * @task: address of RPC task that manages state of connect request
2353 *
2354 * TCP: If the remote end dropped the connection, delay reconnecting.
2355 *
2356 * UDP socket connects are synchronous, but we use a work queue anyway
2357 * to guarantee that even unprivileged user processes can set up a
2358 * socket on a privileged port.
2359 *
2360 * If a UDP socket connect fails, the delay behavior here prevents
2361 * retry floods (hard mounts).
2362 */
2363static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2364{
2365 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2366
2367 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2368
2369 if (transport->sock != NULL) {
2370 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2371 "seconds\n",
2372 xprt, xprt->reestablish_timeout / HZ);
2373
2374 /* Start by resetting any existing state */
2375 xs_reset_transport(transport);
2376
2377 queue_delayed_work(rpciod_workqueue,
2378 &transport->connect_worker,
2379 xprt->reestablish_timeout);
2380 xprt->reestablish_timeout <<= 1;
2381 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2382 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2383 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2384 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2385 } else {
2386 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2387 queue_delayed_work(rpciod_workqueue,
2388 &transport->connect_worker, 0);
2389 }
2390}
2391
2392/**
2393 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2394 * @xprt: rpc_xprt struct containing statistics
2395 * @seq: output file
2396 *
2397 */
2398static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2399{
2400 long idle_time = 0;
2401
2402 if (xprt_connected(xprt))
2403 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2404
2405 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2406 "%llu %llu %lu %llu %llu\n",
2407 xprt->stat.bind_count,
2408 xprt->stat.connect_count,
2409 xprt->stat.connect_time,
2410 idle_time,
2411 xprt->stat.sends,
2412 xprt->stat.recvs,
2413 xprt->stat.bad_xids,
2414 xprt->stat.req_u,
2415 xprt->stat.bklog_u,
2416 xprt->stat.max_slots,
2417 xprt->stat.sending_u,
2418 xprt->stat.pending_u);
2419}
2420
2421/**
2422 * xs_udp_print_stats - display UDP socket-specifc stats
2423 * @xprt: rpc_xprt struct containing statistics
2424 * @seq: output file
2425 *
2426 */
2427static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2428{
2429 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2430
2431 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2432 "%lu %llu %llu\n",
2433 transport->srcport,
2434 xprt->stat.bind_count,
2435 xprt->stat.sends,
2436 xprt->stat.recvs,
2437 xprt->stat.bad_xids,
2438 xprt->stat.req_u,
2439 xprt->stat.bklog_u,
2440 xprt->stat.max_slots,
2441 xprt->stat.sending_u,
2442 xprt->stat.pending_u);
2443}
2444
2445/**
2446 * xs_tcp_print_stats - display TCP socket-specifc stats
2447 * @xprt: rpc_xprt struct containing statistics
2448 * @seq: output file
2449 *
2450 */
2451static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2452{
2453 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2454 long idle_time = 0;
2455
2456 if (xprt_connected(xprt))
2457 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2458
2459 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2460 "%llu %llu %lu %llu %llu\n",
2461 transport->srcport,
2462 xprt->stat.bind_count,
2463 xprt->stat.connect_count,
2464 xprt->stat.connect_time,
2465 idle_time,
2466 xprt->stat.sends,
2467 xprt->stat.recvs,
2468 xprt->stat.bad_xids,
2469 xprt->stat.req_u,
2470 xprt->stat.bklog_u,
2471 xprt->stat.max_slots,
2472 xprt->stat.sending_u,
2473 xprt->stat.pending_u);
2474}
2475
2476/*
2477 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2478 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2479 * to use the server side send routines.
2480 */
2481static void *bc_malloc(struct rpc_task *task, size_t size)
2482{
2483 struct page *page;
2484 struct rpc_buffer *buf;
2485
2486 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2487 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2488 return NULL;
2489
2490 page = alloc_page(GFP_KERNEL);
2491 if (!page)
2492 return NULL;
2493
2494 buf = page_address(page);
2495 buf->len = PAGE_SIZE;
2496
2497 return buf->data;
2498}
2499
2500/*
2501 * Free the space allocated in the bc_alloc routine
2502 */
2503static void bc_free(void *buffer)
2504{
2505 struct rpc_buffer *buf;
2506
2507 if (!buffer)
2508 return;
2509
2510 buf = container_of(buffer, struct rpc_buffer, data);
2511 free_page((unsigned long)buf);
2512}
2513
2514/*
2515 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2516 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2517 */
2518static int bc_sendto(struct rpc_rqst *req)
2519{
2520 int len;
2521 struct xdr_buf *xbufp = &req->rq_snd_buf;
2522 struct rpc_xprt *xprt = req->rq_xprt;
2523 struct sock_xprt *transport =
2524 container_of(xprt, struct sock_xprt, xprt);
2525 struct socket *sock = transport->sock;
2526 unsigned long headoff;
2527 unsigned long tailoff;
2528
2529 xs_encode_stream_record_marker(xbufp);
2530
2531 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2532 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2533 len = svc_send_common(sock, xbufp,
2534 virt_to_page(xbufp->head[0].iov_base), headoff,
2535 xbufp->tail[0].iov_base, tailoff);
2536
2537 if (len != xbufp->len) {
2538 printk(KERN_NOTICE "Error sending entire callback!\n");
2539 len = -EAGAIN;
2540 }
2541
2542 return len;
2543}
2544
2545/*
2546 * The send routine. Borrows from svc_send
2547 */
2548static int bc_send_request(struct rpc_task *task)
2549{
2550 struct rpc_rqst *req = task->tk_rqstp;
2551 struct svc_xprt *xprt;
2552 int len;
2553
2554 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2555 /*
2556 * Get the server socket associated with this callback xprt
2557 */
2558 xprt = req->rq_xprt->bc_xprt;
2559
2560 /*
2561 * Grab the mutex to serialize data as the connection is shared
2562 * with the fore channel
2563 */
2564 if (!mutex_trylock(&xprt->xpt_mutex)) {
2565 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2566 if (!mutex_trylock(&xprt->xpt_mutex))
2567 return -EAGAIN;
2568 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2569 }
2570 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2571 len = -ENOTCONN;
2572 else
2573 len = bc_sendto(req);
2574 mutex_unlock(&xprt->xpt_mutex);
2575
2576 if (len > 0)
2577 len = 0;
2578
2579 return len;
2580}
2581
2582/*
2583 * The close routine. Since this is client initiated, we do nothing
2584 */
2585
2586static void bc_close(struct rpc_xprt *xprt)
2587{
2588}
2589
2590/*
2591 * The xprt destroy routine. Again, because this connection is client
2592 * initiated, we do nothing
2593 */
2594
2595static void bc_destroy(struct rpc_xprt *xprt)
2596{
2597 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2598
2599 xs_xprt_free(xprt);
2600 module_put(THIS_MODULE);
2601}
2602
2603static struct rpc_xprt_ops xs_local_ops = {
2604 .reserve_xprt = xprt_reserve_xprt,
2605 .release_xprt = xs_tcp_release_xprt,
2606 .alloc_slot = xprt_alloc_slot,
2607 .rpcbind = xs_local_rpcbind,
2608 .set_port = xs_local_set_port,
2609 .connect = xs_local_connect,
2610 .buf_alloc = rpc_malloc,
2611 .buf_free = rpc_free,
2612 .send_request = xs_local_send_request,
2613 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2614 .close = xs_close,
2615 .destroy = xs_destroy,
2616 .print_stats = xs_local_print_stats,
2617 .enable_swap = xs_enable_swap,
2618 .disable_swap = xs_disable_swap,
2619};
2620
2621static struct rpc_xprt_ops xs_udp_ops = {
2622 .set_buffer_size = xs_udp_set_buffer_size,
2623 .reserve_xprt = xprt_reserve_xprt_cong,
2624 .release_xprt = xprt_release_xprt_cong,
2625 .alloc_slot = xprt_alloc_slot,
2626 .rpcbind = rpcb_getport_async,
2627 .set_port = xs_set_port,
2628 .connect = xs_connect,
2629 .buf_alloc = rpc_malloc,
2630 .buf_free = rpc_free,
2631 .send_request = xs_udp_send_request,
2632 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2633 .timer = xs_udp_timer,
2634 .release_request = xprt_release_rqst_cong,
2635 .close = xs_close,
2636 .destroy = xs_destroy,
2637 .print_stats = xs_udp_print_stats,
2638 .enable_swap = xs_enable_swap,
2639 .disable_swap = xs_disable_swap,
2640 .inject_disconnect = xs_inject_disconnect,
2641};
2642
2643static struct rpc_xprt_ops xs_tcp_ops = {
2644 .reserve_xprt = xprt_reserve_xprt,
2645 .release_xprt = xs_tcp_release_xprt,
2646 .alloc_slot = xprt_lock_and_alloc_slot,
2647 .rpcbind = rpcb_getport_async,
2648 .set_port = xs_set_port,
2649 .connect = xs_connect,
2650 .buf_alloc = rpc_malloc,
2651 .buf_free = rpc_free,
2652 .send_request = xs_tcp_send_request,
2653 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2654 .close = xs_tcp_shutdown,
2655 .destroy = xs_destroy,
2656 .print_stats = xs_tcp_print_stats,
2657 .enable_swap = xs_enable_swap,
2658 .disable_swap = xs_disable_swap,
2659 .inject_disconnect = xs_inject_disconnect,
2660#ifdef CONFIG_SUNRPC_BACKCHANNEL
2661 .bc_setup = xprt_setup_bc,
2662 .bc_up = xs_tcp_bc_up,
2663 .bc_free_rqst = xprt_free_bc_rqst,
2664 .bc_destroy = xprt_destroy_bc,
2665#endif
2666};
2667
2668/*
2669 * The rpc_xprt_ops for the server backchannel
2670 */
2671
2672static struct rpc_xprt_ops bc_tcp_ops = {
2673 .reserve_xprt = xprt_reserve_xprt,
2674 .release_xprt = xprt_release_xprt,
2675 .alloc_slot = xprt_alloc_slot,
2676 .buf_alloc = bc_malloc,
2677 .buf_free = bc_free,
2678 .send_request = bc_send_request,
2679 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2680 .close = bc_close,
2681 .destroy = bc_destroy,
2682 .print_stats = xs_tcp_print_stats,
2683 .enable_swap = xs_enable_swap,
2684 .disable_swap = xs_disable_swap,
2685 .inject_disconnect = xs_inject_disconnect,
2686};
2687
2688static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2689{
2690 static const struct sockaddr_in sin = {
2691 .sin_family = AF_INET,
2692 .sin_addr.s_addr = htonl(INADDR_ANY),
2693 };
2694 static const struct sockaddr_in6 sin6 = {
2695 .sin6_family = AF_INET6,
2696 .sin6_addr = IN6ADDR_ANY_INIT,
2697 };
2698
2699 switch (family) {
2700 case AF_LOCAL:
2701 break;
2702 case AF_INET:
2703 memcpy(sap, &sin, sizeof(sin));
2704 break;
2705 case AF_INET6:
2706 memcpy(sap, &sin6, sizeof(sin6));
2707 break;
2708 default:
2709 dprintk("RPC: %s: Bad address family\n", __func__);
2710 return -EAFNOSUPPORT;
2711 }
2712 return 0;
2713}
2714
2715static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2716 unsigned int slot_table_size,
2717 unsigned int max_slot_table_size)
2718{
2719 struct rpc_xprt *xprt;
2720 struct sock_xprt *new;
2721
2722 if (args->addrlen > sizeof(xprt->addr)) {
2723 dprintk("RPC: xs_setup_xprt: address too large\n");
2724 return ERR_PTR(-EBADF);
2725 }
2726
2727 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2728 max_slot_table_size);
2729 if (xprt == NULL) {
2730 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2731 "rpc_xprt\n");
2732 return ERR_PTR(-ENOMEM);
2733 }
2734
2735 new = container_of(xprt, struct sock_xprt, xprt);
2736 mutex_init(&new->recv_mutex);
2737 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2738 xprt->addrlen = args->addrlen;
2739 if (args->srcaddr)
2740 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2741 else {
2742 int err;
2743 err = xs_init_anyaddr(args->dstaddr->sa_family,
2744 (struct sockaddr *)&new->srcaddr);
2745 if (err != 0) {
2746 xprt_free(xprt);
2747 return ERR_PTR(err);
2748 }
2749 }
2750
2751 return xprt;
2752}
2753
2754static const struct rpc_timeout xs_local_default_timeout = {
2755 .to_initval = 10 * HZ,
2756 .to_maxval = 10 * HZ,
2757 .to_retries = 2,
2758};
2759
2760/**
2761 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2762 * @args: rpc transport creation arguments
2763 *
2764 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2765 */
2766static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2767{
2768 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2769 struct sock_xprt *transport;
2770 struct rpc_xprt *xprt;
2771 struct rpc_xprt *ret;
2772
2773 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2774 xprt_max_tcp_slot_table_entries);
2775 if (IS_ERR(xprt))
2776 return xprt;
2777 transport = container_of(xprt, struct sock_xprt, xprt);
2778
2779 xprt->prot = 0;
2780 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2781 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2782
2783 xprt->bind_timeout = XS_BIND_TO;
2784 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2785 xprt->idle_timeout = XS_IDLE_DISC_TO;
2786
2787 xprt->ops = &xs_local_ops;
2788 xprt->timeout = &xs_local_default_timeout;
2789
2790 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2791 INIT_DELAYED_WORK(&transport->connect_worker,
2792 xs_dummy_setup_socket);
2793
2794 switch (sun->sun_family) {
2795 case AF_LOCAL:
2796 if (sun->sun_path[0] != '/') {
2797 dprintk("RPC: bad AF_LOCAL address: %s\n",
2798 sun->sun_path);
2799 ret = ERR_PTR(-EINVAL);
2800 goto out_err;
2801 }
2802 xprt_set_bound(xprt);
2803 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2804 ret = ERR_PTR(xs_local_setup_socket(transport));
2805 if (ret)
2806 goto out_err;
2807 break;
2808 default:
2809 ret = ERR_PTR(-EAFNOSUPPORT);
2810 goto out_err;
2811 }
2812
2813 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2814 xprt->address_strings[RPC_DISPLAY_ADDR]);
2815
2816 if (try_module_get(THIS_MODULE))
2817 return xprt;
2818 ret = ERR_PTR(-EINVAL);
2819out_err:
2820 xs_xprt_free(xprt);
2821 return ret;
2822}
2823
2824static const struct rpc_timeout xs_udp_default_timeout = {
2825 .to_initval = 5 * HZ,
2826 .to_maxval = 30 * HZ,
2827 .to_increment = 5 * HZ,
2828 .to_retries = 5,
2829};
2830
2831/**
2832 * xs_setup_udp - Set up transport to use a UDP socket
2833 * @args: rpc transport creation arguments
2834 *
2835 */
2836static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2837{
2838 struct sockaddr *addr = args->dstaddr;
2839 struct rpc_xprt *xprt;
2840 struct sock_xprt *transport;
2841 struct rpc_xprt *ret;
2842
2843 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2844 xprt_udp_slot_table_entries);
2845 if (IS_ERR(xprt))
2846 return xprt;
2847 transport = container_of(xprt, struct sock_xprt, xprt);
2848
2849 xprt->prot = IPPROTO_UDP;
2850 xprt->tsh_size = 0;
2851 /* XXX: header size can vary due to auth type, IPv6, etc. */
2852 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2853
2854 xprt->bind_timeout = XS_BIND_TO;
2855 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2856 xprt->idle_timeout = XS_IDLE_DISC_TO;
2857
2858 xprt->ops = &xs_udp_ops;
2859
2860 xprt->timeout = &xs_udp_default_timeout;
2861
2862 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2863 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2864
2865 switch (addr->sa_family) {
2866 case AF_INET:
2867 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2868 xprt_set_bound(xprt);
2869
2870 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2871 break;
2872 case AF_INET6:
2873 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2874 xprt_set_bound(xprt);
2875
2876 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2877 break;
2878 default:
2879 ret = ERR_PTR(-EAFNOSUPPORT);
2880 goto out_err;
2881 }
2882
2883 if (xprt_bound(xprt))
2884 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2885 xprt->address_strings[RPC_DISPLAY_ADDR],
2886 xprt->address_strings[RPC_DISPLAY_PORT],
2887 xprt->address_strings[RPC_DISPLAY_PROTO]);
2888 else
2889 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2890 xprt->address_strings[RPC_DISPLAY_ADDR],
2891 xprt->address_strings[RPC_DISPLAY_PROTO]);
2892
2893 if (try_module_get(THIS_MODULE))
2894 return xprt;
2895 ret = ERR_PTR(-EINVAL);
2896out_err:
2897 xs_xprt_free(xprt);
2898 return ret;
2899}
2900
2901static const struct rpc_timeout xs_tcp_default_timeout = {
2902 .to_initval = 60 * HZ,
2903 .to_maxval = 60 * HZ,
2904 .to_retries = 2,
2905};
2906
2907/**
2908 * xs_setup_tcp - Set up transport to use a TCP socket
2909 * @args: rpc transport creation arguments
2910 *
2911 */
2912static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2913{
2914 struct sockaddr *addr = args->dstaddr;
2915 struct rpc_xprt *xprt;
2916 struct sock_xprt *transport;
2917 struct rpc_xprt *ret;
2918 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2919
2920 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2921 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2922
2923 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2924 max_slot_table_size);
2925 if (IS_ERR(xprt))
2926 return xprt;
2927 transport = container_of(xprt, struct sock_xprt, xprt);
2928
2929 xprt->prot = IPPROTO_TCP;
2930 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2931 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2932
2933 xprt->bind_timeout = XS_BIND_TO;
2934 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2935 xprt->idle_timeout = XS_IDLE_DISC_TO;
2936
2937 xprt->ops = &xs_tcp_ops;
2938 xprt->timeout = &xs_tcp_default_timeout;
2939
2940 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
2941 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2942
2943 switch (addr->sa_family) {
2944 case AF_INET:
2945 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2946 xprt_set_bound(xprt);
2947
2948 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2949 break;
2950 case AF_INET6:
2951 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2952 xprt_set_bound(xprt);
2953
2954 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2955 break;
2956 default:
2957 ret = ERR_PTR(-EAFNOSUPPORT);
2958 goto out_err;
2959 }
2960
2961 if (xprt_bound(xprt))
2962 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2963 xprt->address_strings[RPC_DISPLAY_ADDR],
2964 xprt->address_strings[RPC_DISPLAY_PORT],
2965 xprt->address_strings[RPC_DISPLAY_PROTO]);
2966 else
2967 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2968 xprt->address_strings[RPC_DISPLAY_ADDR],
2969 xprt->address_strings[RPC_DISPLAY_PROTO]);
2970
2971 if (try_module_get(THIS_MODULE))
2972 return xprt;
2973 ret = ERR_PTR(-EINVAL);
2974out_err:
2975 xs_xprt_free(xprt);
2976 return ret;
2977}
2978
2979/**
2980 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2981 * @args: rpc transport creation arguments
2982 *
2983 */
2984static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2985{
2986 struct sockaddr *addr = args->dstaddr;
2987 struct rpc_xprt *xprt;
2988 struct sock_xprt *transport;
2989 struct svc_sock *bc_sock;
2990 struct rpc_xprt *ret;
2991
2992 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2993 xprt_tcp_slot_table_entries);
2994 if (IS_ERR(xprt))
2995 return xprt;
2996 transport = container_of(xprt, struct sock_xprt, xprt);
2997
2998 xprt->prot = IPPROTO_TCP;
2999 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3000 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3001 xprt->timeout = &xs_tcp_default_timeout;
3002
3003 /* backchannel */
3004 xprt_set_bound(xprt);
3005 xprt->bind_timeout = 0;
3006 xprt->reestablish_timeout = 0;
3007 xprt->idle_timeout = 0;
3008
3009 xprt->ops = &bc_tcp_ops;
3010
3011 switch (addr->sa_family) {
3012 case AF_INET:
3013 xs_format_peer_addresses(xprt, "tcp",
3014 RPCBIND_NETID_TCP);
3015 break;
3016 case AF_INET6:
3017 xs_format_peer_addresses(xprt, "tcp",
3018 RPCBIND_NETID_TCP6);
3019 break;
3020 default:
3021 ret = ERR_PTR(-EAFNOSUPPORT);
3022 goto out_err;
3023 }
3024
3025 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3026 xprt->address_strings[RPC_DISPLAY_ADDR],
3027 xprt->address_strings[RPC_DISPLAY_PORT],
3028 xprt->address_strings[RPC_DISPLAY_PROTO]);
3029
3030 /*
3031 * Once we've associated a backchannel xprt with a connection,
3032 * we want to keep it around as long as the connection lasts,
3033 * in case we need to start using it for a backchannel again;
3034 * this reference won't be dropped until bc_xprt is destroyed.
3035 */
3036 xprt_get(xprt);
3037 args->bc_xprt->xpt_bc_xprt = xprt;
3038 xprt->bc_xprt = args->bc_xprt;
3039 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3040 transport->sock = bc_sock->sk_sock;
3041 transport->inet = bc_sock->sk_sk;
3042
3043 /*
3044 * Since we don't want connections for the backchannel, we set
3045 * the xprt status to connected
3046 */
3047 xprt_set_connected(xprt);
3048
3049 if (try_module_get(THIS_MODULE))
3050 return xprt;
3051
3052 args->bc_xprt->xpt_bc_xprt = NULL;
3053 xprt_put(xprt);
3054 ret = ERR_PTR(-EINVAL);
3055out_err:
3056 xs_xprt_free(xprt);
3057 return ret;
3058}
3059
3060static struct xprt_class xs_local_transport = {
3061 .list = LIST_HEAD_INIT(xs_local_transport.list),
3062 .name = "named UNIX socket",
3063 .owner = THIS_MODULE,
3064 .ident = XPRT_TRANSPORT_LOCAL,
3065 .setup = xs_setup_local,
3066};
3067
3068static struct xprt_class xs_udp_transport = {
3069 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3070 .name = "udp",
3071 .owner = THIS_MODULE,
3072 .ident = XPRT_TRANSPORT_UDP,
3073 .setup = xs_setup_udp,
3074};
3075
3076static struct xprt_class xs_tcp_transport = {
3077 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3078 .name = "tcp",
3079 .owner = THIS_MODULE,
3080 .ident = XPRT_TRANSPORT_TCP,
3081 .setup = xs_setup_tcp,
3082};
3083
3084static struct xprt_class xs_bc_tcp_transport = {
3085 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3086 .name = "tcp NFSv4.1 backchannel",
3087 .owner = THIS_MODULE,
3088 .ident = XPRT_TRANSPORT_BC_TCP,
3089 .setup = xs_setup_bc_tcp,
3090};
3091
3092/**
3093 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3094 *
3095 */
3096int init_socket_xprt(void)
3097{
3098#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3099 if (!sunrpc_table_header)
3100 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3101#endif
3102
3103 xprt_register_transport(&xs_local_transport);
3104 xprt_register_transport(&xs_udp_transport);
3105 xprt_register_transport(&xs_tcp_transport);
3106 xprt_register_transport(&xs_bc_tcp_transport);
3107
3108 return 0;
3109}
3110
3111/**
3112 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3113 *
3114 */
3115void cleanup_socket_xprt(void)
3116{
3117#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3118 if (sunrpc_table_header) {
3119 unregister_sysctl_table(sunrpc_table_header);
3120 sunrpc_table_header = NULL;
3121 }
3122#endif
3123
3124 xprt_unregister_transport(&xs_local_transport);
3125 xprt_unregister_transport(&xs_udp_transport);
3126 xprt_unregister_transport(&xs_tcp_transport);
3127 xprt_unregister_transport(&xs_bc_tcp_transport);
3128}
3129
3130static int param_set_uint_minmax(const char *val,
3131 const struct kernel_param *kp,
3132 unsigned int min, unsigned int max)
3133{
3134 unsigned int num;
3135 int ret;
3136
3137 if (!val)
3138 return -EINVAL;
3139 ret = kstrtouint(val, 0, &num);
3140 if (ret == -EINVAL || num < min || num > max)
3141 return -EINVAL;
3142 *((unsigned int *)kp->arg) = num;
3143 return 0;
3144}
3145
3146static int param_set_portnr(const char *val, const struct kernel_param *kp)
3147{
3148 return param_set_uint_minmax(val, kp,
3149 RPC_MIN_RESVPORT,
3150 RPC_MAX_RESVPORT);
3151}
3152
3153static const struct kernel_param_ops param_ops_portnr = {
3154 .set = param_set_portnr,
3155 .get = param_get_uint,
3156};
3157
3158#define param_check_portnr(name, p) \
3159 __param_check(name, p, unsigned int);
3160
3161module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3162module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3163
3164static int param_set_slot_table_size(const char *val,
3165 const struct kernel_param *kp)
3166{
3167 return param_set_uint_minmax(val, kp,
3168 RPC_MIN_SLOT_TABLE,
3169 RPC_MAX_SLOT_TABLE);
3170}
3171
3172static const struct kernel_param_ops param_ops_slot_table_size = {
3173 .set = param_set_slot_table_size,
3174 .get = param_get_uint,
3175};
3176
3177#define param_check_slot_table_size(name, p) \
3178 __param_check(name, p, unsigned int);
3179
3180static int param_set_max_slot_table_size(const char *val,
3181 const struct kernel_param *kp)
3182{
3183 return param_set_uint_minmax(val, kp,
3184 RPC_MIN_SLOT_TABLE,
3185 RPC_MAX_SLOT_TABLE_LIMIT);
3186}
3187
3188static const struct kernel_param_ops param_ops_max_slot_table_size = {
3189 .set = param_set_max_slot_table_size,
3190 .get = param_get_uint,
3191};
3192
3193#define param_check_max_slot_table_size(name, p) \
3194 __param_check(name, p, unsigned int);
3195
3196module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3197 slot_table_size, 0644);
3198module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3199 max_slot_table_size, 0644);
3200module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3201 slot_table_size, 0644);
3202