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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_set_srcport(struct sock_xprt *transport, struct socket *sock);
66static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
67 struct socket *sock);
68
69/*
70 * xprtsock tunables
71 */
72static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
73static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
74static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
75
76static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
77static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
78
79#define XS_TCP_LINGER_TO (15U * HZ)
80static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
81
82/*
83 * We can register our own files under /proc/sys/sunrpc by
84 * calling register_sysctl() again. The files in that
85 * directory become the union of all files registered there.
86 *
87 * We simply need to make sure that we don't collide with
88 * someone else's file names!
89 */
90
91static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
92static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
93static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
94static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
95static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
96
97static struct ctl_table_header *sunrpc_table_header;
98
99static struct xprt_class xs_local_transport;
100static struct xprt_class xs_udp_transport;
101static struct xprt_class xs_tcp_transport;
102static struct xprt_class xs_tcp_tls_transport;
103static struct xprt_class xs_bc_tcp_transport;
104
105/*
106 * FIXME: changing the UDP slot table size should also resize the UDP
107 * socket buffers for existing UDP transports
108 */
109static struct ctl_table xs_tunables_table[] = {
110 {
111 .procname = "udp_slot_table_entries",
112 .data = &xprt_udp_slot_table_entries,
113 .maxlen = sizeof(unsigned int),
114 .mode = 0644,
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &min_slot_table_size,
117 .extra2 = &max_slot_table_size
118 },
119 {
120 .procname = "tcp_slot_table_entries",
121 .data = &xprt_tcp_slot_table_entries,
122 .maxlen = sizeof(unsigned int),
123 .mode = 0644,
124 .proc_handler = proc_dointvec_minmax,
125 .extra1 = &min_slot_table_size,
126 .extra2 = &max_slot_table_size
127 },
128 {
129 .procname = "tcp_max_slot_table_entries",
130 .data = &xprt_max_tcp_slot_table_entries,
131 .maxlen = sizeof(unsigned int),
132 .mode = 0644,
133 .proc_handler = proc_dointvec_minmax,
134 .extra1 = &min_slot_table_size,
135 .extra2 = &max_tcp_slot_table_limit
136 },
137 {
138 .procname = "min_resvport",
139 .data = &xprt_min_resvport,
140 .maxlen = sizeof(unsigned int),
141 .mode = 0644,
142 .proc_handler = proc_dointvec_minmax,
143 .extra1 = &xprt_min_resvport_limit,
144 .extra2 = &xprt_max_resvport_limit
145 },
146 {
147 .procname = "max_resvport",
148 .data = &xprt_max_resvport,
149 .maxlen = sizeof(unsigned int),
150 .mode = 0644,
151 .proc_handler = proc_dointvec_minmax,
152 .extra1 = &xprt_min_resvport_limit,
153 .extra2 = &xprt_max_resvport_limit
154 },
155 {
156 .procname = "tcp_fin_timeout",
157 .data = &xs_tcp_fin_timeout,
158 .maxlen = sizeof(xs_tcp_fin_timeout),
159 .mode = 0644,
160 .proc_handler = proc_dointvec_jiffies,
161 },
162 { },
163};
164
165/*
166 * Wait duration for a reply from the RPC portmapper.
167 */
168#define XS_BIND_TO (60U * HZ)
169
170/*
171 * Delay if a UDP socket connect error occurs. This is most likely some
172 * kind of resource problem on the local host.
173 */
174#define XS_UDP_REEST_TO (2U * HZ)
175
176/*
177 * The reestablish timeout allows clients to delay for a bit before attempting
178 * to reconnect to a server that just dropped our connection.
179 *
180 * We implement an exponential backoff when trying to reestablish a TCP
181 * transport connection with the server. Some servers like to drop a TCP
182 * connection when they are overworked, so we start with a short timeout and
183 * increase over time if the server is down or not responding.
184 */
185#define XS_TCP_INIT_REEST_TO (3U * HZ)
186
187/*
188 * TCP idle timeout; client drops the transport socket if it is idle
189 * for this long. Note that we also timeout UDP sockets to prevent
190 * holding port numbers when there is no RPC traffic.
191 */
192#define XS_IDLE_DISC_TO (5U * 60 * HZ)
193
194/*
195 * TLS handshake timeout.
196 */
197#define XS_TLS_HANDSHAKE_TO (10U * HZ)
198
199#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
200# undef RPC_DEBUG_DATA
201# define RPCDBG_FACILITY RPCDBG_TRANS
202#endif
203
204#ifdef RPC_DEBUG_DATA
205static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
206{
207 u8 *buf = (u8 *) packet;
208 int j;
209
210 dprintk("RPC: %s\n", msg);
211 for (j = 0; j < count && j < 128; j += 4) {
212 if (!(j & 31)) {
213 if (j)
214 dprintk("\n");
215 dprintk("0x%04x ", j);
216 }
217 dprintk("%02x%02x%02x%02x ",
218 buf[j], buf[j+1], buf[j+2], buf[j+3]);
219 }
220 dprintk("\n");
221}
222#else
223static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
224{
225 /* NOP */
226}
227#endif
228
229static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
230{
231 return (struct rpc_xprt *) sk->sk_user_data;
232}
233
234static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
235{
236 return (struct sockaddr *) &xprt->addr;
237}
238
239static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_un *) &xprt->addr;
242}
243
244static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
245{
246 return (struct sockaddr_in *) &xprt->addr;
247}
248
249static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
250{
251 return (struct sockaddr_in6 *) &xprt->addr;
252}
253
254static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
255{
256 struct sockaddr *sap = xs_addr(xprt);
257 struct sockaddr_in6 *sin6;
258 struct sockaddr_in *sin;
259 struct sockaddr_un *sun;
260 char buf[128];
261
262 switch (sap->sa_family) {
263 case AF_LOCAL:
264 sun = xs_addr_un(xprt);
265 if (sun->sun_path[0]) {
266 strscpy(buf, sun->sun_path, sizeof(buf));
267 } else {
268 buf[0] = '@';
269 strscpy(buf+1, sun->sun_path+1, sizeof(buf)-1);
270 }
271 xprt->address_strings[RPC_DISPLAY_ADDR] =
272 kstrdup(buf, GFP_KERNEL);
273 break;
274 case AF_INET:
275 (void)rpc_ntop(sap, buf, sizeof(buf));
276 xprt->address_strings[RPC_DISPLAY_ADDR] =
277 kstrdup(buf, GFP_KERNEL);
278 sin = xs_addr_in(xprt);
279 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
280 break;
281 case AF_INET6:
282 (void)rpc_ntop(sap, buf, sizeof(buf));
283 xprt->address_strings[RPC_DISPLAY_ADDR] =
284 kstrdup(buf, GFP_KERNEL);
285 sin6 = xs_addr_in6(xprt);
286 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
287 break;
288 default:
289 BUG();
290 }
291
292 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
293}
294
295static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
296{
297 struct sockaddr *sap = xs_addr(xprt);
298 char buf[128];
299
300 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
301 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
302
303 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
304 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
305}
306
307static void xs_format_peer_addresses(struct rpc_xprt *xprt,
308 const char *protocol,
309 const char *netid)
310{
311 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
312 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
313 xs_format_common_peer_addresses(xprt);
314 xs_format_common_peer_ports(xprt);
315}
316
317static void xs_update_peer_port(struct rpc_xprt *xprt)
318{
319 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
320 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
321
322 xs_format_common_peer_ports(xprt);
323}
324
325static void xs_free_peer_addresses(struct rpc_xprt *xprt)
326{
327 unsigned int i;
328
329 for (i = 0; i < RPC_DISPLAY_MAX; i++)
330 switch (i) {
331 case RPC_DISPLAY_PROTO:
332 case RPC_DISPLAY_NETID:
333 continue;
334 default:
335 kfree(xprt->address_strings[i]);
336 }
337}
338
339static size_t
340xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
341{
342 size_t i,n;
343
344 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
345 return want;
346 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
347 for (i = 0; i < n; i++) {
348 if (buf->pages[i])
349 continue;
350 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
351 if (!buf->pages[i]) {
352 i *= PAGE_SIZE;
353 return i > buf->page_base ? i - buf->page_base : 0;
354 }
355 }
356 return want;
357}
358
359static int
360xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
361 struct cmsghdr *cmsg, int ret)
362{
363 u8 content_type = tls_get_record_type(sock->sk, cmsg);
364 u8 level, description;
365
366 switch (content_type) {
367 case 0:
368 break;
369 case TLS_RECORD_TYPE_DATA:
370 /* TLS sets EOR at the end of each application data
371 * record, even though there might be more frames
372 * waiting to be decrypted.
373 */
374 msg->msg_flags &= ~MSG_EOR;
375 break;
376 case TLS_RECORD_TYPE_ALERT:
377 tls_alert_recv(sock->sk, msg, &level, &description);
378 ret = (level == TLS_ALERT_LEVEL_FATAL) ?
379 -EACCES : -EAGAIN;
380 break;
381 default:
382 /* discard this record type */
383 ret = -EAGAIN;
384 }
385 return ret;
386}
387
388static int
389xs_sock_recv_cmsg(struct socket *sock, struct msghdr *msg, int flags)
390{
391 union {
392 struct cmsghdr cmsg;
393 u8 buf[CMSG_SPACE(sizeof(u8))];
394 } u;
395 int ret;
396
397 msg->msg_control = &u;
398 msg->msg_controllen = sizeof(u);
399 ret = sock_recvmsg(sock, msg, flags);
400 if (msg->msg_controllen != sizeof(u))
401 ret = xs_sock_process_cmsg(sock, msg, &u.cmsg, ret);
402 return ret;
403}
404
405static ssize_t
406xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
407{
408 ssize_t ret;
409 if (seek != 0)
410 iov_iter_advance(&msg->msg_iter, seek);
411 ret = xs_sock_recv_cmsg(sock, msg, flags);
412 return ret > 0 ? ret + seek : ret;
413}
414
415static ssize_t
416xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
417 struct kvec *kvec, size_t count, size_t seek)
418{
419 iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count);
420 return xs_sock_recvmsg(sock, msg, flags, seek);
421}
422
423static ssize_t
424xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
425 struct bio_vec *bvec, unsigned long nr, size_t count,
426 size_t seek)
427{
428 iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count);
429 return xs_sock_recvmsg(sock, msg, flags, seek);
430}
431
432static ssize_t
433xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
434 size_t count)
435{
436 iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
437 return xs_sock_recv_cmsg(sock, msg, flags);
438}
439
440#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
441static void
442xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
443{
444 struct bvec_iter bi = {
445 .bi_size = count,
446 };
447 struct bio_vec bv;
448
449 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
450 for_each_bvec(bv, bvec, bi, bi)
451 flush_dcache_page(bv.bv_page);
452}
453#else
454static inline void
455xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
456{
457}
458#endif
459
460static ssize_t
461xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
462 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
463{
464 size_t want, seek_init = seek, offset = 0;
465 ssize_t ret;
466
467 want = min_t(size_t, count, buf->head[0].iov_len);
468 if (seek < want) {
469 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
470 if (ret <= 0)
471 goto sock_err;
472 offset += ret;
473 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
474 goto out;
475 if (ret != want)
476 goto out;
477 seek = 0;
478 } else {
479 seek -= want;
480 offset += want;
481 }
482
483 want = xs_alloc_sparse_pages(
484 buf, min_t(size_t, count - offset, buf->page_len),
485 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
486 if (seek < want) {
487 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
488 xdr_buf_pagecount(buf),
489 want + buf->page_base,
490 seek + buf->page_base);
491 if (ret <= 0)
492 goto sock_err;
493 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
494 ret -= buf->page_base;
495 offset += ret;
496 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
497 goto out;
498 if (ret != want)
499 goto out;
500 seek = 0;
501 } else {
502 seek -= want;
503 offset += want;
504 }
505
506 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
507 if (seek < want) {
508 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
509 if (ret <= 0)
510 goto sock_err;
511 offset += ret;
512 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
513 goto out;
514 if (ret != want)
515 goto out;
516 } else if (offset < seek_init)
517 offset = seek_init;
518 ret = -EMSGSIZE;
519out:
520 *read = offset - seek_init;
521 return ret;
522sock_err:
523 offset += seek;
524 goto out;
525}
526
527static void
528xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
529{
530 if (!transport->recv.copied) {
531 if (buf->head[0].iov_len >= transport->recv.offset)
532 memcpy(buf->head[0].iov_base,
533 &transport->recv.xid,
534 transport->recv.offset);
535 transport->recv.copied = transport->recv.offset;
536 }
537}
538
539static bool
540xs_read_stream_request_done(struct sock_xprt *transport)
541{
542 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
543}
544
545static void
546xs_read_stream_check_eor(struct sock_xprt *transport,
547 struct msghdr *msg)
548{
549 if (xs_read_stream_request_done(transport))
550 msg->msg_flags |= MSG_EOR;
551}
552
553static ssize_t
554xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
555 int flags, struct rpc_rqst *req)
556{
557 struct xdr_buf *buf = &req->rq_private_buf;
558 size_t want, read;
559 ssize_t ret;
560
561 xs_read_header(transport, buf);
562
563 want = transport->recv.len - transport->recv.offset;
564 if (want != 0) {
565 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
566 transport->recv.copied + want,
567 transport->recv.copied,
568 &read);
569 transport->recv.offset += read;
570 transport->recv.copied += read;
571 }
572
573 if (transport->recv.offset == transport->recv.len)
574 xs_read_stream_check_eor(transport, msg);
575
576 if (want == 0)
577 return 0;
578
579 switch (ret) {
580 default:
581 break;
582 case -EFAULT:
583 case -EMSGSIZE:
584 msg->msg_flags |= MSG_TRUNC;
585 return read;
586 case 0:
587 return -ESHUTDOWN;
588 }
589 return ret < 0 ? ret : read;
590}
591
592static size_t
593xs_read_stream_headersize(bool isfrag)
594{
595 if (isfrag)
596 return sizeof(__be32);
597 return 3 * sizeof(__be32);
598}
599
600static ssize_t
601xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
602 int flags, size_t want, size_t seek)
603{
604 struct kvec kvec = {
605 .iov_base = &transport->recv.fraghdr,
606 .iov_len = want,
607 };
608 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
609}
610
611#if defined(CONFIG_SUNRPC_BACKCHANNEL)
612static ssize_t
613xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
614{
615 struct rpc_xprt *xprt = &transport->xprt;
616 struct rpc_rqst *req;
617 ssize_t ret;
618
619 /* Is this transport associated with the backchannel? */
620 if (!xprt->bc_serv)
621 return -ESHUTDOWN;
622
623 /* Look up and lock the request corresponding to the given XID */
624 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
625 if (!req) {
626 printk(KERN_WARNING "Callback slot table overflowed\n");
627 return -ESHUTDOWN;
628 }
629 if (transport->recv.copied && !req->rq_private_buf.len)
630 return -ESHUTDOWN;
631
632 ret = xs_read_stream_request(transport, msg, flags, req);
633 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
634 xprt_complete_bc_request(req, transport->recv.copied);
635 else
636 req->rq_private_buf.len = transport->recv.copied;
637
638 return ret;
639}
640#else /* CONFIG_SUNRPC_BACKCHANNEL */
641static ssize_t
642xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
643{
644 return -ESHUTDOWN;
645}
646#endif /* CONFIG_SUNRPC_BACKCHANNEL */
647
648static ssize_t
649xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
650{
651 struct rpc_xprt *xprt = &transport->xprt;
652 struct rpc_rqst *req;
653 ssize_t ret = 0;
654
655 /* Look up and lock the request corresponding to the given XID */
656 spin_lock(&xprt->queue_lock);
657 req = xprt_lookup_rqst(xprt, transport->recv.xid);
658 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
659 msg->msg_flags |= MSG_TRUNC;
660 goto out;
661 }
662 xprt_pin_rqst(req);
663 spin_unlock(&xprt->queue_lock);
664
665 ret = xs_read_stream_request(transport, msg, flags, req);
666
667 spin_lock(&xprt->queue_lock);
668 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
669 xprt_complete_rqst(req->rq_task, transport->recv.copied);
670 else
671 req->rq_private_buf.len = transport->recv.copied;
672 xprt_unpin_rqst(req);
673out:
674 spin_unlock(&xprt->queue_lock);
675 return ret;
676}
677
678static ssize_t
679xs_read_stream(struct sock_xprt *transport, int flags)
680{
681 struct msghdr msg = { 0 };
682 size_t want, read = 0;
683 ssize_t ret = 0;
684
685 if (transport->recv.len == 0) {
686 want = xs_read_stream_headersize(transport->recv.copied != 0);
687 ret = xs_read_stream_header(transport, &msg, flags, want,
688 transport->recv.offset);
689 if (ret <= 0)
690 goto out_err;
691 transport->recv.offset = ret;
692 if (transport->recv.offset != want)
693 return transport->recv.offset;
694 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
695 RPC_FRAGMENT_SIZE_MASK;
696 transport->recv.offset -= sizeof(transport->recv.fraghdr);
697 read = ret;
698 }
699
700 switch (be32_to_cpu(transport->recv.calldir)) {
701 default:
702 msg.msg_flags |= MSG_TRUNC;
703 break;
704 case RPC_CALL:
705 ret = xs_read_stream_call(transport, &msg, flags);
706 break;
707 case RPC_REPLY:
708 ret = xs_read_stream_reply(transport, &msg, flags);
709 }
710 if (msg.msg_flags & MSG_TRUNC) {
711 transport->recv.calldir = cpu_to_be32(-1);
712 transport->recv.copied = -1;
713 }
714 if (ret < 0)
715 goto out_err;
716 read += ret;
717 if (transport->recv.offset < transport->recv.len) {
718 if (!(msg.msg_flags & MSG_TRUNC))
719 return read;
720 msg.msg_flags = 0;
721 ret = xs_read_discard(transport->sock, &msg, flags,
722 transport->recv.len - transport->recv.offset);
723 if (ret <= 0)
724 goto out_err;
725 transport->recv.offset += ret;
726 read += ret;
727 if (transport->recv.offset != transport->recv.len)
728 return read;
729 }
730 if (xs_read_stream_request_done(transport)) {
731 trace_xs_stream_read_request(transport);
732 transport->recv.copied = 0;
733 }
734 transport->recv.offset = 0;
735 transport->recv.len = 0;
736 return read;
737out_err:
738 return ret != 0 ? ret : -ESHUTDOWN;
739}
740
741static __poll_t xs_poll_socket(struct sock_xprt *transport)
742{
743 return transport->sock->ops->poll(transport->file, transport->sock,
744 NULL);
745}
746
747static bool xs_poll_socket_readable(struct sock_xprt *transport)
748{
749 __poll_t events = xs_poll_socket(transport);
750
751 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
752}
753
754static void xs_poll_check_readable(struct sock_xprt *transport)
755{
756
757 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
758 if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
759 return;
760 if (!xs_poll_socket_readable(transport))
761 return;
762 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
763 queue_work(xprtiod_workqueue, &transport->recv_worker);
764}
765
766static void xs_stream_data_receive(struct sock_xprt *transport)
767{
768 size_t read = 0;
769 ssize_t ret = 0;
770
771 mutex_lock(&transport->recv_mutex);
772 if (transport->sock == NULL)
773 goto out;
774 for (;;) {
775 ret = xs_read_stream(transport, MSG_DONTWAIT);
776 if (ret < 0)
777 break;
778 read += ret;
779 cond_resched();
780 }
781 if (ret == -ESHUTDOWN)
782 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
783 else if (ret == -EACCES)
784 xprt_wake_pending_tasks(&transport->xprt, -EACCES);
785 else
786 xs_poll_check_readable(transport);
787out:
788 mutex_unlock(&transport->recv_mutex);
789 trace_xs_stream_read_data(&transport->xprt, ret, read);
790}
791
792static void xs_stream_data_receive_workfn(struct work_struct *work)
793{
794 struct sock_xprt *transport =
795 container_of(work, struct sock_xprt, recv_worker);
796 unsigned int pflags = memalloc_nofs_save();
797
798 xs_stream_data_receive(transport);
799 memalloc_nofs_restore(pflags);
800}
801
802static void
803xs_stream_reset_connect(struct sock_xprt *transport)
804{
805 transport->recv.offset = 0;
806 transport->recv.len = 0;
807 transport->recv.copied = 0;
808 transport->xmit.offset = 0;
809}
810
811static void
812xs_stream_start_connect(struct sock_xprt *transport)
813{
814 transport->xprt.stat.connect_count++;
815 transport->xprt.stat.connect_start = jiffies;
816}
817
818#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
819
820/**
821 * xs_nospace - handle transmit was incomplete
822 * @req: pointer to RPC request
823 * @transport: pointer to struct sock_xprt
824 *
825 */
826static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
827{
828 struct rpc_xprt *xprt = &transport->xprt;
829 struct sock *sk = transport->inet;
830 int ret = -EAGAIN;
831
832 trace_rpc_socket_nospace(req, transport);
833
834 /* Protect against races with write_space */
835 spin_lock(&xprt->transport_lock);
836
837 /* Don't race with disconnect */
838 if (xprt_connected(xprt)) {
839 /* wait for more buffer space */
840 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
841 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
842 sk->sk_write_pending++;
843 xprt_wait_for_buffer_space(xprt);
844 } else
845 ret = -ENOTCONN;
846
847 spin_unlock(&xprt->transport_lock);
848 return ret;
849}
850
851static int xs_sock_nospace(struct rpc_rqst *req)
852{
853 struct sock_xprt *transport =
854 container_of(req->rq_xprt, struct sock_xprt, xprt);
855 struct sock *sk = transport->inet;
856 int ret = -EAGAIN;
857
858 lock_sock(sk);
859 if (!sock_writeable(sk))
860 ret = xs_nospace(req, transport);
861 release_sock(sk);
862 return ret;
863}
864
865static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
866{
867 struct sock_xprt *transport =
868 container_of(req->rq_xprt, struct sock_xprt, xprt);
869 struct sock *sk = transport->inet;
870 int ret = -EAGAIN;
871
872 if (vm_wait)
873 return -ENOBUFS;
874 lock_sock(sk);
875 if (!sk_stream_memory_free(sk))
876 ret = xs_nospace(req, transport);
877 release_sock(sk);
878 return ret;
879}
880
881static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
882{
883 return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
884}
885
886/*
887 * Determine if the previous message in the stream was aborted before it
888 * could complete transmission.
889 */
890static bool
891xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
892{
893 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
894}
895
896/*
897 * Return the stream record marker field for a record of length < 2^31-1
898 */
899static rpc_fraghdr
900xs_stream_record_marker(struct xdr_buf *xdr)
901{
902 if (!xdr->len)
903 return 0;
904 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
905}
906
907/**
908 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
909 * @req: pointer to RPC request
910 *
911 * Return values:
912 * 0: The request has been sent
913 * EAGAIN: The socket was blocked, please call again later to
914 * complete the request
915 * ENOTCONN: Caller needs to invoke connect logic then call again
916 * other: Some other error occurred, the request was not sent
917 */
918static int xs_local_send_request(struct rpc_rqst *req)
919{
920 struct rpc_xprt *xprt = req->rq_xprt;
921 struct sock_xprt *transport =
922 container_of(xprt, struct sock_xprt, xprt);
923 struct xdr_buf *xdr = &req->rq_snd_buf;
924 rpc_fraghdr rm = xs_stream_record_marker(xdr);
925 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
926 struct msghdr msg = {
927 .msg_flags = XS_SENDMSG_FLAGS,
928 };
929 bool vm_wait;
930 unsigned int sent;
931 int status;
932
933 /* Close the stream if the previous transmission was incomplete */
934 if (xs_send_request_was_aborted(transport, req)) {
935 xprt_force_disconnect(xprt);
936 return -ENOTCONN;
937 }
938
939 xs_pktdump("packet data:",
940 req->rq_svec->iov_base, req->rq_svec->iov_len);
941
942 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
943
944 req->rq_xtime = ktime_get();
945 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
946 transport->xmit.offset, rm, &sent);
947 dprintk("RPC: %s(%u) = %d\n",
948 __func__, xdr->len - transport->xmit.offset, status);
949
950 if (likely(sent > 0) || status == 0) {
951 transport->xmit.offset += sent;
952 req->rq_bytes_sent = transport->xmit.offset;
953 if (likely(req->rq_bytes_sent >= msglen)) {
954 req->rq_xmit_bytes_sent += transport->xmit.offset;
955 transport->xmit.offset = 0;
956 return 0;
957 }
958 status = -EAGAIN;
959 vm_wait = false;
960 }
961
962 switch (status) {
963 case -EAGAIN:
964 status = xs_stream_nospace(req, vm_wait);
965 break;
966 default:
967 dprintk("RPC: sendmsg returned unrecognized error %d\n",
968 -status);
969 fallthrough;
970 case -EPIPE:
971 xprt_force_disconnect(xprt);
972 status = -ENOTCONN;
973 }
974
975 return status;
976}
977
978/**
979 * xs_udp_send_request - write an RPC request to a UDP socket
980 * @req: pointer to RPC request
981 *
982 * Return values:
983 * 0: The request has been sent
984 * EAGAIN: The socket was blocked, please call again later to
985 * complete the request
986 * ENOTCONN: Caller needs to invoke connect logic then call again
987 * other: Some other error occurred, the request was not sent
988 */
989static int xs_udp_send_request(struct rpc_rqst *req)
990{
991 struct rpc_xprt *xprt = req->rq_xprt;
992 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
993 struct xdr_buf *xdr = &req->rq_snd_buf;
994 struct msghdr msg = {
995 .msg_name = xs_addr(xprt),
996 .msg_namelen = xprt->addrlen,
997 .msg_flags = XS_SENDMSG_FLAGS,
998 };
999 unsigned int sent;
1000 int status;
1001
1002 xs_pktdump("packet data:",
1003 req->rq_svec->iov_base,
1004 req->rq_svec->iov_len);
1005
1006 if (!xprt_bound(xprt))
1007 return -ENOTCONN;
1008
1009 if (!xprt_request_get_cong(xprt, req))
1010 return -EBADSLT;
1011
1012 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
1013 if (status < 0)
1014 return status;
1015 req->rq_xtime = ktime_get();
1016 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
1017
1018 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1019 xdr->len, status);
1020
1021 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
1022 if (status == -EPERM)
1023 goto process_status;
1024
1025 if (status == -EAGAIN && sock_writeable(transport->inet))
1026 status = -ENOBUFS;
1027
1028 if (sent > 0 || status == 0) {
1029 req->rq_xmit_bytes_sent += sent;
1030 if (sent >= req->rq_slen)
1031 return 0;
1032 /* Still some bytes left; set up for a retry later. */
1033 status = -EAGAIN;
1034 }
1035
1036process_status:
1037 switch (status) {
1038 case -ENOTSOCK:
1039 status = -ENOTCONN;
1040 /* Should we call xs_close() here? */
1041 break;
1042 case -EAGAIN:
1043 status = xs_sock_nospace(req);
1044 break;
1045 case -ENETUNREACH:
1046 case -ENOBUFS:
1047 case -EPIPE:
1048 case -ECONNREFUSED:
1049 case -EPERM:
1050 /* When the server has died, an ICMP port unreachable message
1051 * prompts ECONNREFUSED. */
1052 break;
1053 default:
1054 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1055 -status);
1056 }
1057
1058 return status;
1059}
1060
1061/**
1062 * xs_tcp_send_request - write an RPC request to a TCP socket
1063 * @req: pointer to RPC request
1064 *
1065 * Return values:
1066 * 0: The request has been sent
1067 * EAGAIN: The socket was blocked, please call again later to
1068 * complete the request
1069 * ENOTCONN: Caller needs to invoke connect logic then call again
1070 * other: Some other error occurred, the request was not sent
1071 *
1072 * XXX: In the case of soft timeouts, should we eventually give up
1073 * if sendmsg is not able to make progress?
1074 */
1075static int xs_tcp_send_request(struct rpc_rqst *req)
1076{
1077 struct rpc_xprt *xprt = req->rq_xprt;
1078 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1079 struct xdr_buf *xdr = &req->rq_snd_buf;
1080 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1081 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1082 struct msghdr msg = {
1083 .msg_flags = XS_SENDMSG_FLAGS,
1084 };
1085 bool vm_wait;
1086 unsigned int sent;
1087 int status;
1088
1089 /* Close the stream if the previous transmission was incomplete */
1090 if (xs_send_request_was_aborted(transport, req)) {
1091 if (transport->sock != NULL)
1092 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1093 return -ENOTCONN;
1094 }
1095 if (!transport->inet)
1096 return -ENOTCONN;
1097
1098 xs_pktdump("packet data:",
1099 req->rq_svec->iov_base,
1100 req->rq_svec->iov_len);
1101
1102 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1103 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1104
1105 xs_set_srcport(transport, transport->sock);
1106
1107 /* Continue transmitting the packet/record. We must be careful
1108 * to cope with writespace callbacks arriving _after_ we have
1109 * called sendmsg(). */
1110 req->rq_xtime = ktime_get();
1111 tcp_sock_set_cork(transport->inet, true);
1112
1113 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1114
1115 do {
1116 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1117 transport->xmit.offset, rm, &sent);
1118
1119 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1120 xdr->len - transport->xmit.offset, status);
1121
1122 /* If we've sent the entire packet, immediately
1123 * reset the count of bytes sent. */
1124 transport->xmit.offset += sent;
1125 req->rq_bytes_sent = transport->xmit.offset;
1126 if (likely(req->rq_bytes_sent >= msglen)) {
1127 req->rq_xmit_bytes_sent += transport->xmit.offset;
1128 transport->xmit.offset = 0;
1129 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1130 tcp_sock_set_cork(transport->inet, false);
1131 return 0;
1132 }
1133
1134 WARN_ON_ONCE(sent == 0 && status == 0);
1135
1136 if (sent > 0)
1137 vm_wait = false;
1138
1139 } while (status == 0);
1140
1141 switch (status) {
1142 case -ENOTSOCK:
1143 status = -ENOTCONN;
1144 /* Should we call xs_close() here? */
1145 break;
1146 case -EAGAIN:
1147 status = xs_stream_nospace(req, vm_wait);
1148 break;
1149 case -ECONNRESET:
1150 case -ECONNREFUSED:
1151 case -ENOTCONN:
1152 case -EADDRINUSE:
1153 case -ENOBUFS:
1154 case -EPIPE:
1155 break;
1156 default:
1157 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1158 -status);
1159 }
1160
1161 return status;
1162}
1163
1164static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1165{
1166 transport->old_data_ready = sk->sk_data_ready;
1167 transport->old_state_change = sk->sk_state_change;
1168 transport->old_write_space = sk->sk_write_space;
1169 transport->old_error_report = sk->sk_error_report;
1170}
1171
1172static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1173{
1174 sk->sk_data_ready = transport->old_data_ready;
1175 sk->sk_state_change = transport->old_state_change;
1176 sk->sk_write_space = transport->old_write_space;
1177 sk->sk_error_report = transport->old_error_report;
1178}
1179
1180static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1181{
1182 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1183
1184 transport->xprt_err = 0;
1185 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1186 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1187 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1188 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1189 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1190}
1191
1192static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1193{
1194 set_bit(nr, &transport->sock_state);
1195 queue_work(xprtiod_workqueue, &transport->error_worker);
1196}
1197
1198static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1199{
1200 xprt->connect_cookie++;
1201 smp_mb__before_atomic();
1202 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1203 clear_bit(XPRT_CLOSING, &xprt->state);
1204 xs_sock_reset_state_flags(xprt);
1205 smp_mb__after_atomic();
1206}
1207
1208/**
1209 * xs_error_report - callback to handle TCP socket state errors
1210 * @sk: socket
1211 *
1212 * Note: we don't call sock_error() since there may be a rpc_task
1213 * using the socket, and so we don't want to clear sk->sk_err.
1214 */
1215static void xs_error_report(struct sock *sk)
1216{
1217 struct sock_xprt *transport;
1218 struct rpc_xprt *xprt;
1219
1220 if (!(xprt = xprt_from_sock(sk)))
1221 return;
1222
1223 transport = container_of(xprt, struct sock_xprt, xprt);
1224 transport->xprt_err = -sk->sk_err;
1225 if (transport->xprt_err == 0)
1226 return;
1227 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1228 xprt, -transport->xprt_err);
1229 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1230
1231 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1232 smp_mb__before_atomic();
1233 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1234}
1235
1236static void xs_reset_transport(struct sock_xprt *transport)
1237{
1238 struct socket *sock = transport->sock;
1239 struct sock *sk = transport->inet;
1240 struct rpc_xprt *xprt = &transport->xprt;
1241 struct file *filp = transport->file;
1242
1243 if (sk == NULL)
1244 return;
1245 /*
1246 * Make sure we're calling this in a context from which it is safe
1247 * to call __fput_sync(). In practice that means rpciod and the
1248 * system workqueue.
1249 */
1250 if (!(current->flags & PF_WQ_WORKER)) {
1251 WARN_ON_ONCE(1);
1252 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1253 return;
1254 }
1255
1256 if (atomic_read(&transport->xprt.swapper))
1257 sk_clear_memalloc(sk);
1258
1259 tls_handshake_cancel(sk);
1260
1261 kernel_sock_shutdown(sock, SHUT_RDWR);
1262
1263 mutex_lock(&transport->recv_mutex);
1264 lock_sock(sk);
1265 transport->inet = NULL;
1266 transport->sock = NULL;
1267 transport->file = NULL;
1268
1269 sk->sk_user_data = NULL;
1270
1271 xs_restore_old_callbacks(transport, sk);
1272 xprt_clear_connected(xprt);
1273 xs_sock_reset_connection_flags(xprt);
1274 /* Reset stream record info */
1275 xs_stream_reset_connect(transport);
1276 release_sock(sk);
1277 mutex_unlock(&transport->recv_mutex);
1278
1279 trace_rpc_socket_close(xprt, sock);
1280 __fput_sync(filp);
1281
1282 xprt_disconnect_done(xprt);
1283}
1284
1285/**
1286 * xs_close - close a socket
1287 * @xprt: transport
1288 *
1289 * This is used when all requests are complete; ie, no DRC state remains
1290 * on the server we want to save.
1291 *
1292 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1293 * xs_reset_transport() zeroing the socket from underneath a writer.
1294 */
1295static void xs_close(struct rpc_xprt *xprt)
1296{
1297 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1298
1299 dprintk("RPC: xs_close xprt %p\n", xprt);
1300
1301 if (transport->sock)
1302 tls_handshake_close(transport->sock);
1303 xs_reset_transport(transport);
1304 xprt->reestablish_timeout = 0;
1305}
1306
1307static void xs_inject_disconnect(struct rpc_xprt *xprt)
1308{
1309 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1310 xprt);
1311 xprt_disconnect_done(xprt);
1312}
1313
1314static void xs_xprt_free(struct rpc_xprt *xprt)
1315{
1316 xs_free_peer_addresses(xprt);
1317 xprt_free(xprt);
1318}
1319
1320/**
1321 * xs_destroy - prepare to shutdown a transport
1322 * @xprt: doomed transport
1323 *
1324 */
1325static void xs_destroy(struct rpc_xprt *xprt)
1326{
1327 struct sock_xprt *transport = container_of(xprt,
1328 struct sock_xprt, xprt);
1329 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1330
1331 cancel_delayed_work_sync(&transport->connect_worker);
1332 xs_close(xprt);
1333 cancel_work_sync(&transport->recv_worker);
1334 cancel_work_sync(&transport->error_worker);
1335 xs_xprt_free(xprt);
1336 module_put(THIS_MODULE);
1337}
1338
1339/**
1340 * xs_udp_data_read_skb - receive callback for UDP sockets
1341 * @xprt: transport
1342 * @sk: socket
1343 * @skb: skbuff
1344 *
1345 */
1346static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1347 struct sock *sk,
1348 struct sk_buff *skb)
1349{
1350 struct rpc_task *task;
1351 struct rpc_rqst *rovr;
1352 int repsize, copied;
1353 u32 _xid;
1354 __be32 *xp;
1355
1356 repsize = skb->len;
1357 if (repsize < 4) {
1358 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1359 return;
1360 }
1361
1362 /* Copy the XID from the skb... */
1363 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1364 if (xp == NULL)
1365 return;
1366
1367 /* Look up and lock the request corresponding to the given XID */
1368 spin_lock(&xprt->queue_lock);
1369 rovr = xprt_lookup_rqst(xprt, *xp);
1370 if (!rovr)
1371 goto out_unlock;
1372 xprt_pin_rqst(rovr);
1373 xprt_update_rtt(rovr->rq_task);
1374 spin_unlock(&xprt->queue_lock);
1375 task = rovr->rq_task;
1376
1377 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1378 copied = repsize;
1379
1380 /* Suck it into the iovec, verify checksum if not done by hw. */
1381 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1382 spin_lock(&xprt->queue_lock);
1383 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1384 goto out_unpin;
1385 }
1386
1387
1388 spin_lock(&xprt->transport_lock);
1389 xprt_adjust_cwnd(xprt, task, copied);
1390 spin_unlock(&xprt->transport_lock);
1391 spin_lock(&xprt->queue_lock);
1392 xprt_complete_rqst(task, copied);
1393 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1394out_unpin:
1395 xprt_unpin_rqst(rovr);
1396 out_unlock:
1397 spin_unlock(&xprt->queue_lock);
1398}
1399
1400static void xs_udp_data_receive(struct sock_xprt *transport)
1401{
1402 struct sk_buff *skb;
1403 struct sock *sk;
1404 int err;
1405
1406 mutex_lock(&transport->recv_mutex);
1407 sk = transport->inet;
1408 if (sk == NULL)
1409 goto out;
1410 for (;;) {
1411 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err);
1412 if (skb == NULL)
1413 break;
1414 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1415 consume_skb(skb);
1416 cond_resched();
1417 }
1418 xs_poll_check_readable(transport);
1419out:
1420 mutex_unlock(&transport->recv_mutex);
1421}
1422
1423static void xs_udp_data_receive_workfn(struct work_struct *work)
1424{
1425 struct sock_xprt *transport =
1426 container_of(work, struct sock_xprt, recv_worker);
1427 unsigned int pflags = memalloc_nofs_save();
1428
1429 xs_udp_data_receive(transport);
1430 memalloc_nofs_restore(pflags);
1431}
1432
1433/**
1434 * xs_data_ready - "data ready" callback for sockets
1435 * @sk: socket with data to read
1436 *
1437 */
1438static void xs_data_ready(struct sock *sk)
1439{
1440 struct rpc_xprt *xprt;
1441
1442 trace_sk_data_ready(sk);
1443
1444 xprt = xprt_from_sock(sk);
1445 if (xprt != NULL) {
1446 struct sock_xprt *transport = container_of(xprt,
1447 struct sock_xprt, xprt);
1448
1449 trace_xs_data_ready(xprt);
1450
1451 transport->old_data_ready(sk);
1452
1453 if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
1454 return;
1455
1456 /* Any data means we had a useful conversation, so
1457 * then we don't need to delay the next reconnect
1458 */
1459 if (xprt->reestablish_timeout)
1460 xprt->reestablish_timeout = 0;
1461 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1462 queue_work(xprtiod_workqueue, &transport->recv_worker);
1463 }
1464}
1465
1466/*
1467 * Helper function to force a TCP close if the server is sending
1468 * junk and/or it has put us in CLOSE_WAIT
1469 */
1470static void xs_tcp_force_close(struct rpc_xprt *xprt)
1471{
1472 xprt_force_disconnect(xprt);
1473}
1474
1475#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1476static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1477{
1478 return PAGE_SIZE;
1479}
1480#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1481
1482/**
1483 * xs_local_state_change - callback to handle AF_LOCAL socket state changes
1484 * @sk: socket whose state has changed
1485 *
1486 */
1487static void xs_local_state_change(struct sock *sk)
1488{
1489 struct rpc_xprt *xprt;
1490 struct sock_xprt *transport;
1491
1492 if (!(xprt = xprt_from_sock(sk)))
1493 return;
1494 transport = container_of(xprt, struct sock_xprt, xprt);
1495 if (sk->sk_shutdown & SHUTDOWN_MASK) {
1496 clear_bit(XPRT_CONNECTED, &xprt->state);
1497 /* Trigger the socket release */
1498 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1499 }
1500}
1501
1502/**
1503 * xs_tcp_state_change - callback to handle TCP socket state changes
1504 * @sk: socket whose state has changed
1505 *
1506 */
1507static void xs_tcp_state_change(struct sock *sk)
1508{
1509 struct rpc_xprt *xprt;
1510 struct sock_xprt *transport;
1511
1512 if (!(xprt = xprt_from_sock(sk)))
1513 return;
1514 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1515 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1516 sk->sk_state, xprt_connected(xprt),
1517 sock_flag(sk, SOCK_DEAD),
1518 sock_flag(sk, SOCK_ZAPPED),
1519 sk->sk_shutdown);
1520
1521 transport = container_of(xprt, struct sock_xprt, xprt);
1522 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1523 switch (sk->sk_state) {
1524 case TCP_ESTABLISHED:
1525 if (!xprt_test_and_set_connected(xprt)) {
1526 xprt->connect_cookie++;
1527 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1528 xprt_clear_connecting(xprt);
1529
1530 xprt->stat.connect_count++;
1531 xprt->stat.connect_time += (long)jiffies -
1532 xprt->stat.connect_start;
1533 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1534 }
1535 break;
1536 case TCP_FIN_WAIT1:
1537 /* The client initiated a shutdown of the socket */
1538 xprt->connect_cookie++;
1539 xprt->reestablish_timeout = 0;
1540 set_bit(XPRT_CLOSING, &xprt->state);
1541 smp_mb__before_atomic();
1542 clear_bit(XPRT_CONNECTED, &xprt->state);
1543 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1544 smp_mb__after_atomic();
1545 break;
1546 case TCP_CLOSE_WAIT:
1547 /* The server initiated a shutdown of the socket */
1548 xprt->connect_cookie++;
1549 clear_bit(XPRT_CONNECTED, &xprt->state);
1550 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1551 fallthrough;
1552 case TCP_CLOSING:
1553 /*
1554 * If the server closed down the connection, make sure that
1555 * we back off before reconnecting
1556 */
1557 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1558 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1559 break;
1560 case TCP_LAST_ACK:
1561 set_bit(XPRT_CLOSING, &xprt->state);
1562 smp_mb__before_atomic();
1563 clear_bit(XPRT_CONNECTED, &xprt->state);
1564 smp_mb__after_atomic();
1565 break;
1566 case TCP_CLOSE:
1567 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1568 &transport->sock_state))
1569 xprt_clear_connecting(xprt);
1570 clear_bit(XPRT_CLOSING, &xprt->state);
1571 /* Trigger the socket release */
1572 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1573 }
1574}
1575
1576static void xs_write_space(struct sock *sk)
1577{
1578 struct sock_xprt *transport;
1579 struct rpc_xprt *xprt;
1580
1581 if (!sk->sk_socket)
1582 return;
1583 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1584
1585 if (unlikely(!(xprt = xprt_from_sock(sk))))
1586 return;
1587 transport = container_of(xprt, struct sock_xprt, xprt);
1588 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state))
1589 return;
1590 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1591 sk->sk_write_pending--;
1592}
1593
1594/**
1595 * xs_udp_write_space - callback invoked when socket buffer space
1596 * becomes available
1597 * @sk: socket whose state has changed
1598 *
1599 * Called when more output buffer space is available for this socket.
1600 * We try not to wake our writers until they can make "significant"
1601 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1602 * with a bunch of small requests.
1603 */
1604static void xs_udp_write_space(struct sock *sk)
1605{
1606 /* from net/core/sock.c:sock_def_write_space */
1607 if (sock_writeable(sk))
1608 xs_write_space(sk);
1609}
1610
1611/**
1612 * xs_tcp_write_space - callback invoked when socket buffer space
1613 * becomes available
1614 * @sk: socket whose state has changed
1615 *
1616 * Called when more output buffer space is available for this socket.
1617 * We try not to wake our writers until they can make "significant"
1618 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1619 * with a bunch of small requests.
1620 */
1621static void xs_tcp_write_space(struct sock *sk)
1622{
1623 /* from net/core/stream.c:sk_stream_write_space */
1624 if (sk_stream_is_writeable(sk))
1625 xs_write_space(sk);
1626}
1627
1628static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1629{
1630 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1631 struct sock *sk = transport->inet;
1632
1633 if (transport->rcvsize) {
1634 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1635 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1636 }
1637 if (transport->sndsize) {
1638 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1639 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1640 sk->sk_write_space(sk);
1641 }
1642}
1643
1644/**
1645 * xs_udp_set_buffer_size - set send and receive limits
1646 * @xprt: generic transport
1647 * @sndsize: requested size of send buffer, in bytes
1648 * @rcvsize: requested size of receive buffer, in bytes
1649 *
1650 * Set socket send and receive buffer size limits.
1651 */
1652static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1653{
1654 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1655
1656 transport->sndsize = 0;
1657 if (sndsize)
1658 transport->sndsize = sndsize + 1024;
1659 transport->rcvsize = 0;
1660 if (rcvsize)
1661 transport->rcvsize = rcvsize + 1024;
1662
1663 xs_udp_do_set_buffer_size(xprt);
1664}
1665
1666/**
1667 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1668 * @xprt: controlling transport
1669 * @task: task that timed out
1670 *
1671 * Adjust the congestion window after a retransmit timeout has occurred.
1672 */
1673static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1674{
1675 spin_lock(&xprt->transport_lock);
1676 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1677 spin_unlock(&xprt->transport_lock);
1678}
1679
1680static int xs_get_random_port(void)
1681{
1682 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1683 unsigned short range;
1684 unsigned short rand;
1685
1686 if (max < min)
1687 return -EADDRINUSE;
1688 range = max - min + 1;
1689 rand = get_random_u32_below(range);
1690 return rand + min;
1691}
1692
1693static unsigned short xs_sock_getport(struct socket *sock)
1694{
1695 struct sockaddr_storage buf;
1696 unsigned short port = 0;
1697
1698 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1699 goto out;
1700 switch (buf.ss_family) {
1701 case AF_INET6:
1702 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1703 break;
1704 case AF_INET:
1705 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1706 }
1707out:
1708 return port;
1709}
1710
1711/**
1712 * xs_set_port - reset the port number in the remote endpoint address
1713 * @xprt: generic transport
1714 * @port: new port number
1715 *
1716 */
1717static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1718{
1719 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1720
1721 rpc_set_port(xs_addr(xprt), port);
1722 xs_update_peer_port(xprt);
1723}
1724
1725static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1726{
1727 if (transport->srcport == 0 && transport->xprt.reuseport)
1728 transport->srcport = xs_sock_getport(sock);
1729}
1730
1731static int xs_get_srcport(struct sock_xprt *transport)
1732{
1733 int port = transport->srcport;
1734
1735 if (port == 0 && transport->xprt.resvport)
1736 port = xs_get_random_port();
1737 return port;
1738}
1739
1740static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1741{
1742 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1743 unsigned short ret = 0;
1744 mutex_lock(&sock->recv_mutex);
1745 if (sock->sock)
1746 ret = xs_sock_getport(sock->sock);
1747 mutex_unlock(&sock->recv_mutex);
1748 return ret;
1749}
1750
1751static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1752{
1753 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1754 union {
1755 struct sockaddr sa;
1756 struct sockaddr_storage st;
1757 } saddr;
1758 int ret = -ENOTCONN;
1759
1760 mutex_lock(&sock->recv_mutex);
1761 if (sock->sock) {
1762 ret = kernel_getsockname(sock->sock, &saddr.sa);
1763 if (ret >= 0)
1764 ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1765 }
1766 mutex_unlock(&sock->recv_mutex);
1767 return ret;
1768}
1769
1770static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1771{
1772 if (transport->srcport != 0)
1773 transport->srcport = 0;
1774 if (!transport->xprt.resvport)
1775 return 0;
1776 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1777 return xprt_max_resvport;
1778 return --port;
1779}
1780static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1781{
1782 struct sockaddr_storage myaddr;
1783 int err, nloop = 0;
1784 int port = xs_get_srcport(transport);
1785 unsigned short last;
1786
1787 /*
1788 * If we are asking for any ephemeral port (i.e. port == 0 &&
1789 * transport->xprt.resvport == 0), don't bind. Let the local
1790 * port selection happen implicitly when the socket is used
1791 * (for example at connect time).
1792 *
1793 * This ensures that we can continue to establish TCP
1794 * connections even when all local ephemeral ports are already
1795 * a part of some TCP connection. This makes no difference
1796 * for UDP sockets, but also doesn't harm them.
1797 *
1798 * If we're asking for any reserved port (i.e. port == 0 &&
1799 * transport->xprt.resvport == 1) xs_get_srcport above will
1800 * ensure that port is non-zero and we will bind as needed.
1801 */
1802 if (port <= 0)
1803 return port;
1804
1805 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1806 do {
1807 rpc_set_port((struct sockaddr *)&myaddr, port);
1808 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1809 transport->xprt.addrlen);
1810 if (err == 0) {
1811 if (transport->xprt.reuseport)
1812 transport->srcport = port;
1813 break;
1814 }
1815 last = port;
1816 port = xs_next_srcport(transport, port);
1817 if (port > last)
1818 nloop++;
1819 } while (err == -EADDRINUSE && nloop != 2);
1820
1821 if (myaddr.ss_family == AF_INET)
1822 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1823 &((struct sockaddr_in *)&myaddr)->sin_addr,
1824 port, err ? "failed" : "ok", err);
1825 else
1826 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1827 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1828 port, err ? "failed" : "ok", err);
1829 return err;
1830}
1831
1832/*
1833 * We don't support autobind on AF_LOCAL sockets
1834 */
1835static void xs_local_rpcbind(struct rpc_task *task)
1836{
1837 xprt_set_bound(task->tk_xprt);
1838}
1839
1840static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1841{
1842}
1843
1844#ifdef CONFIG_DEBUG_LOCK_ALLOC
1845static struct lock_class_key xs_key[3];
1846static struct lock_class_key xs_slock_key[3];
1847
1848static inline void xs_reclassify_socketu(struct socket *sock)
1849{
1850 struct sock *sk = sock->sk;
1851
1852 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1853 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1854}
1855
1856static inline void xs_reclassify_socket4(struct socket *sock)
1857{
1858 struct sock *sk = sock->sk;
1859
1860 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1861 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1862}
1863
1864static inline void xs_reclassify_socket6(struct socket *sock)
1865{
1866 struct sock *sk = sock->sk;
1867
1868 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1869 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1870}
1871
1872static inline void xs_reclassify_socket(int family, struct socket *sock)
1873{
1874 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1875 return;
1876
1877 switch (family) {
1878 case AF_LOCAL:
1879 xs_reclassify_socketu(sock);
1880 break;
1881 case AF_INET:
1882 xs_reclassify_socket4(sock);
1883 break;
1884 case AF_INET6:
1885 xs_reclassify_socket6(sock);
1886 break;
1887 }
1888}
1889#else
1890static inline void xs_reclassify_socket(int family, struct socket *sock)
1891{
1892}
1893#endif
1894
1895static void xs_dummy_setup_socket(struct work_struct *work)
1896{
1897}
1898
1899static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1900 struct sock_xprt *transport, int family, int type,
1901 int protocol, bool reuseport)
1902{
1903 struct file *filp;
1904 struct socket *sock;
1905 int err;
1906
1907 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1908 if (err < 0) {
1909 dprintk("RPC: can't create %d transport socket (%d).\n",
1910 protocol, -err);
1911 goto out;
1912 }
1913 xs_reclassify_socket(family, sock);
1914
1915 if (reuseport)
1916 sock_set_reuseport(sock->sk);
1917
1918 err = xs_bind(transport, sock);
1919 if (err) {
1920 sock_release(sock);
1921 goto out;
1922 }
1923
1924 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1925 if (IS_ERR(filp))
1926 return ERR_CAST(filp);
1927 transport->file = filp;
1928
1929 return sock;
1930out:
1931 return ERR_PTR(err);
1932}
1933
1934static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1935 struct socket *sock)
1936{
1937 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1938 xprt);
1939
1940 if (!transport->inet) {
1941 struct sock *sk = sock->sk;
1942
1943 lock_sock(sk);
1944
1945 xs_save_old_callbacks(transport, sk);
1946
1947 sk->sk_user_data = xprt;
1948 sk->sk_data_ready = xs_data_ready;
1949 sk->sk_write_space = xs_udp_write_space;
1950 sk->sk_state_change = xs_local_state_change;
1951 sk->sk_error_report = xs_error_report;
1952 sk->sk_use_task_frag = false;
1953
1954 xprt_clear_connected(xprt);
1955
1956 /* Reset to new socket */
1957 transport->sock = sock;
1958 transport->inet = sk;
1959
1960 release_sock(sk);
1961 }
1962
1963 xs_stream_start_connect(transport);
1964
1965 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1966}
1967
1968/**
1969 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1970 * @transport: socket transport to connect
1971 */
1972static int xs_local_setup_socket(struct sock_xprt *transport)
1973{
1974 struct rpc_xprt *xprt = &transport->xprt;
1975 struct file *filp;
1976 struct socket *sock;
1977 int status;
1978
1979 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1980 SOCK_STREAM, 0, &sock, 1);
1981 if (status < 0) {
1982 dprintk("RPC: can't create AF_LOCAL "
1983 "transport socket (%d).\n", -status);
1984 goto out;
1985 }
1986 xs_reclassify_socket(AF_LOCAL, sock);
1987
1988 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1989 if (IS_ERR(filp)) {
1990 status = PTR_ERR(filp);
1991 goto out;
1992 }
1993 transport->file = filp;
1994
1995 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1996 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1997
1998 status = xs_local_finish_connecting(xprt, sock);
1999 trace_rpc_socket_connect(xprt, sock, status);
2000 switch (status) {
2001 case 0:
2002 dprintk("RPC: xprt %p connected to %s\n",
2003 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2004 xprt->stat.connect_count++;
2005 xprt->stat.connect_time += (long)jiffies -
2006 xprt->stat.connect_start;
2007 xprt_set_connected(xprt);
2008 break;
2009 case -ENOBUFS:
2010 break;
2011 case -ENOENT:
2012 dprintk("RPC: xprt %p: socket %s does not exist\n",
2013 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2014 break;
2015 case -ECONNREFUSED:
2016 dprintk("RPC: xprt %p: connection refused for %s\n",
2017 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2018 break;
2019 default:
2020 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2021 __func__, -status,
2022 xprt->address_strings[RPC_DISPLAY_ADDR]);
2023 }
2024
2025out:
2026 xprt_clear_connecting(xprt);
2027 xprt_wake_pending_tasks(xprt, status);
2028 return status;
2029}
2030
2031static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2032{
2033 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2034 int ret;
2035
2036 if (transport->file)
2037 goto force_disconnect;
2038
2039 if (RPC_IS_ASYNC(task)) {
2040 /*
2041 * We want the AF_LOCAL connect to be resolved in the
2042 * filesystem namespace of the process making the rpc
2043 * call. Thus we connect synchronously.
2044 *
2045 * If we want to support asynchronous AF_LOCAL calls,
2046 * we'll need to figure out how to pass a namespace to
2047 * connect.
2048 */
2049 rpc_task_set_rpc_status(task, -ENOTCONN);
2050 goto out_wake;
2051 }
2052 ret = xs_local_setup_socket(transport);
2053 if (ret && !RPC_IS_SOFTCONN(task))
2054 msleep_interruptible(15000);
2055 return;
2056force_disconnect:
2057 xprt_force_disconnect(xprt);
2058out_wake:
2059 xprt_clear_connecting(xprt);
2060 xprt_wake_pending_tasks(xprt, -ENOTCONN);
2061}
2062
2063#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2064/*
2065 * Note that this should be called with XPRT_LOCKED held, or recv_mutex
2066 * held, or when we otherwise know that we have exclusive access to the
2067 * socket, to guard against races with xs_reset_transport.
2068 */
2069static void xs_set_memalloc(struct rpc_xprt *xprt)
2070{
2071 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2072 xprt);
2073
2074 /*
2075 * If there's no sock, then we have nothing to set. The
2076 * reconnecting process will get it for us.
2077 */
2078 if (!transport->inet)
2079 return;
2080 if (atomic_read(&xprt->swapper))
2081 sk_set_memalloc(transport->inet);
2082}
2083
2084/**
2085 * xs_enable_swap - Tag this transport as being used for swap.
2086 * @xprt: transport to tag
2087 *
2088 * Take a reference to this transport on behalf of the rpc_clnt, and
2089 * optionally mark it for swapping if it wasn't already.
2090 */
2091static int
2092xs_enable_swap(struct rpc_xprt *xprt)
2093{
2094 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2095
2096 mutex_lock(&xs->recv_mutex);
2097 if (atomic_inc_return(&xprt->swapper) == 1 &&
2098 xs->inet)
2099 sk_set_memalloc(xs->inet);
2100 mutex_unlock(&xs->recv_mutex);
2101 return 0;
2102}
2103
2104/**
2105 * xs_disable_swap - Untag this transport as being used for swap.
2106 * @xprt: transport to tag
2107 *
2108 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2109 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2110 */
2111static void
2112xs_disable_swap(struct rpc_xprt *xprt)
2113{
2114 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2115
2116 mutex_lock(&xs->recv_mutex);
2117 if (atomic_dec_and_test(&xprt->swapper) &&
2118 xs->inet)
2119 sk_clear_memalloc(xs->inet);
2120 mutex_unlock(&xs->recv_mutex);
2121}
2122#else
2123static void xs_set_memalloc(struct rpc_xprt *xprt)
2124{
2125}
2126
2127static int
2128xs_enable_swap(struct rpc_xprt *xprt)
2129{
2130 return -EINVAL;
2131}
2132
2133static void
2134xs_disable_swap(struct rpc_xprt *xprt)
2135{
2136}
2137#endif
2138
2139static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2140{
2141 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2142
2143 if (!transport->inet) {
2144 struct sock *sk = sock->sk;
2145
2146 lock_sock(sk);
2147
2148 xs_save_old_callbacks(transport, sk);
2149
2150 sk->sk_user_data = xprt;
2151 sk->sk_data_ready = xs_data_ready;
2152 sk->sk_write_space = xs_udp_write_space;
2153 sk->sk_use_task_frag = false;
2154
2155 xprt_set_connected(xprt);
2156
2157 /* Reset to new socket */
2158 transport->sock = sock;
2159 transport->inet = sk;
2160
2161 xs_set_memalloc(xprt);
2162
2163 release_sock(sk);
2164 }
2165 xs_udp_do_set_buffer_size(xprt);
2166
2167 xprt->stat.connect_start = jiffies;
2168}
2169
2170static void xs_udp_setup_socket(struct work_struct *work)
2171{
2172 struct sock_xprt *transport =
2173 container_of(work, struct sock_xprt, connect_worker.work);
2174 struct rpc_xprt *xprt = &transport->xprt;
2175 struct socket *sock;
2176 int status = -EIO;
2177 unsigned int pflags = current->flags;
2178
2179 if (atomic_read(&xprt->swapper))
2180 current->flags |= PF_MEMALLOC;
2181 sock = xs_create_sock(xprt, transport,
2182 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2183 IPPROTO_UDP, false);
2184 if (IS_ERR(sock))
2185 goto out;
2186
2187 dprintk("RPC: worker connecting xprt %p via %s to "
2188 "%s (port %s)\n", xprt,
2189 xprt->address_strings[RPC_DISPLAY_PROTO],
2190 xprt->address_strings[RPC_DISPLAY_ADDR],
2191 xprt->address_strings[RPC_DISPLAY_PORT]);
2192
2193 xs_udp_finish_connecting(xprt, sock);
2194 trace_rpc_socket_connect(xprt, sock, 0);
2195 status = 0;
2196out:
2197 xprt_clear_connecting(xprt);
2198 xprt_unlock_connect(xprt, transport);
2199 xprt_wake_pending_tasks(xprt, status);
2200 current_restore_flags(pflags, PF_MEMALLOC);
2201}
2202
2203/**
2204 * xs_tcp_shutdown - gracefully shut down a TCP socket
2205 * @xprt: transport
2206 *
2207 * Initiates a graceful shutdown of the TCP socket by calling the
2208 * equivalent of shutdown(SHUT_RDWR);
2209 */
2210static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2211{
2212 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2213 struct socket *sock = transport->sock;
2214 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2215
2216 if (sock == NULL)
2217 return;
2218 if (!xprt->reuseport) {
2219 xs_close(xprt);
2220 return;
2221 }
2222 switch (skst) {
2223 case TCP_FIN_WAIT1:
2224 case TCP_FIN_WAIT2:
2225 case TCP_LAST_ACK:
2226 break;
2227 case TCP_ESTABLISHED:
2228 case TCP_CLOSE_WAIT:
2229 kernel_sock_shutdown(sock, SHUT_RDWR);
2230 trace_rpc_socket_shutdown(xprt, sock);
2231 break;
2232 default:
2233 xs_reset_transport(transport);
2234 }
2235}
2236
2237static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2238 struct socket *sock)
2239{
2240 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2241 struct net *net = sock_net(sock->sk);
2242 unsigned long connect_timeout;
2243 unsigned long syn_retries;
2244 unsigned int keepidle;
2245 unsigned int keepcnt;
2246 unsigned int timeo;
2247 unsigned long t;
2248
2249 spin_lock(&xprt->transport_lock);
2250 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2251 keepcnt = xprt->timeout->to_retries + 1;
2252 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2253 (xprt->timeout->to_retries + 1);
2254 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2255 spin_unlock(&xprt->transport_lock);
2256
2257 /* TCP Keepalive options */
2258 sock_set_keepalive(sock->sk);
2259 tcp_sock_set_keepidle(sock->sk, keepidle);
2260 tcp_sock_set_keepintvl(sock->sk, keepidle);
2261 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2262
2263 /* TCP user timeout (see RFC5482) */
2264 tcp_sock_set_user_timeout(sock->sk, timeo);
2265
2266 /* Connect timeout */
2267 connect_timeout = max_t(unsigned long,
2268 DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
2269 syn_retries = max_t(unsigned long,
2270 READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
2271 for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
2272 ;
2273 if (t <= syn_retries)
2274 tcp_sock_set_syncnt(sock->sk, t - 1);
2275}
2276
2277static void xs_tcp_do_set_connect_timeout(struct rpc_xprt *xprt,
2278 unsigned long connect_timeout)
2279{
2280 struct sock_xprt *transport =
2281 container_of(xprt, struct sock_xprt, xprt);
2282 struct rpc_timeout to;
2283 unsigned long initval;
2284
2285 memcpy(&to, xprt->timeout, sizeof(to));
2286 /* Arbitrary lower limit */
2287 initval = max_t(unsigned long, connect_timeout, XS_TCP_INIT_REEST_TO);
2288 to.to_initval = initval;
2289 to.to_maxval = initval;
2290 to.to_retries = 0;
2291 memcpy(&transport->tcp_timeout, &to, sizeof(transport->tcp_timeout));
2292 xprt->timeout = &transport->tcp_timeout;
2293 xprt->connect_timeout = connect_timeout;
2294}
2295
2296static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2297 unsigned long connect_timeout,
2298 unsigned long reconnect_timeout)
2299{
2300 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2301
2302 spin_lock(&xprt->transport_lock);
2303 if (reconnect_timeout < xprt->max_reconnect_timeout)
2304 xprt->max_reconnect_timeout = reconnect_timeout;
2305 if (connect_timeout < xprt->connect_timeout)
2306 xs_tcp_do_set_connect_timeout(xprt, connect_timeout);
2307 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2308 spin_unlock(&xprt->transport_lock);
2309}
2310
2311static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2312{
2313 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2314
2315 if (!transport->inet) {
2316 struct sock *sk = sock->sk;
2317
2318 /* Avoid temporary address, they are bad for long-lived
2319 * connections such as NFS mounts.
2320 * RFC4941, section 3.6 suggests that:
2321 * Individual applications, which have specific
2322 * knowledge about the normal duration of connections,
2323 * MAY override this as appropriate.
2324 */
2325 if (xs_addr(xprt)->sa_family == PF_INET6) {
2326 ip6_sock_set_addr_preferences(sk,
2327 IPV6_PREFER_SRC_PUBLIC);
2328 }
2329
2330 xs_tcp_set_socket_timeouts(xprt, sock);
2331 tcp_sock_set_nodelay(sk);
2332
2333 lock_sock(sk);
2334
2335 xs_save_old_callbacks(transport, sk);
2336
2337 sk->sk_user_data = xprt;
2338 sk->sk_data_ready = xs_data_ready;
2339 sk->sk_state_change = xs_tcp_state_change;
2340 sk->sk_write_space = xs_tcp_write_space;
2341 sk->sk_error_report = xs_error_report;
2342 sk->sk_use_task_frag = false;
2343
2344 /* socket options */
2345 sock_reset_flag(sk, SOCK_LINGER);
2346
2347 xprt_clear_connected(xprt);
2348
2349 /* Reset to new socket */
2350 transport->sock = sock;
2351 transport->inet = sk;
2352
2353 release_sock(sk);
2354 }
2355
2356 if (!xprt_bound(xprt))
2357 return -ENOTCONN;
2358
2359 xs_set_memalloc(xprt);
2360
2361 xs_stream_start_connect(transport);
2362
2363 /* Tell the socket layer to start connecting... */
2364 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2365 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2366}
2367
2368/**
2369 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2370 * @work: queued work item
2371 *
2372 * Invoked by a work queue tasklet.
2373 */
2374static void xs_tcp_setup_socket(struct work_struct *work)
2375{
2376 struct sock_xprt *transport =
2377 container_of(work, struct sock_xprt, connect_worker.work);
2378 struct socket *sock = transport->sock;
2379 struct rpc_xprt *xprt = &transport->xprt;
2380 int status;
2381 unsigned int pflags = current->flags;
2382
2383 if (atomic_read(&xprt->swapper))
2384 current->flags |= PF_MEMALLOC;
2385
2386 if (xprt_connected(xprt))
2387 goto out;
2388 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2389 &transport->sock_state) ||
2390 !sock) {
2391 xs_reset_transport(transport);
2392 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2393 SOCK_STREAM, IPPROTO_TCP, true);
2394 if (IS_ERR(sock)) {
2395 xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2396 goto out;
2397 }
2398 }
2399
2400 dprintk("RPC: worker connecting xprt %p via %s to "
2401 "%s (port %s)\n", xprt,
2402 xprt->address_strings[RPC_DISPLAY_PROTO],
2403 xprt->address_strings[RPC_DISPLAY_ADDR],
2404 xprt->address_strings[RPC_DISPLAY_PORT]);
2405
2406 status = xs_tcp_finish_connecting(xprt, sock);
2407 trace_rpc_socket_connect(xprt, sock, status);
2408 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2409 xprt, -status, xprt_connected(xprt),
2410 sock->sk->sk_state);
2411 switch (status) {
2412 case 0:
2413 case -EINPROGRESS:
2414 /* SYN_SENT! */
2415 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2416 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2417 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2418 fallthrough;
2419 case -EALREADY:
2420 goto out_unlock;
2421 case -EADDRNOTAVAIL:
2422 /* Source port number is unavailable. Try a new one! */
2423 transport->srcport = 0;
2424 status = -EAGAIN;
2425 break;
2426 case -EINVAL:
2427 /* Happens, for instance, if the user specified a link
2428 * local IPv6 address without a scope-id.
2429 */
2430 case -ECONNREFUSED:
2431 case -ECONNRESET:
2432 case -ENETDOWN:
2433 case -ENETUNREACH:
2434 case -EHOSTUNREACH:
2435 case -EADDRINUSE:
2436 case -ENOBUFS:
2437 break;
2438 default:
2439 printk("%s: connect returned unhandled error %d\n",
2440 __func__, status);
2441 status = -EAGAIN;
2442 }
2443
2444 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2445 * We need to wake them first to ensure the correct error code.
2446 */
2447 xprt_wake_pending_tasks(xprt, status);
2448 xs_tcp_force_close(xprt);
2449out:
2450 xprt_clear_connecting(xprt);
2451out_unlock:
2452 xprt_unlock_connect(xprt, transport);
2453 current_restore_flags(pflags, PF_MEMALLOC);
2454}
2455
2456/*
2457 * Transfer the connected socket to @upper_transport, then mark that
2458 * xprt CONNECTED.
2459 */
2460static int xs_tcp_tls_finish_connecting(struct rpc_xprt *lower_xprt,
2461 struct sock_xprt *upper_transport)
2462{
2463 struct sock_xprt *lower_transport =
2464 container_of(lower_xprt, struct sock_xprt, xprt);
2465 struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2466
2467 if (!upper_transport->inet) {
2468 struct socket *sock = lower_transport->sock;
2469 struct sock *sk = sock->sk;
2470
2471 /* Avoid temporary address, they are bad for long-lived
2472 * connections such as NFS mounts.
2473 * RFC4941, section 3.6 suggests that:
2474 * Individual applications, which have specific
2475 * knowledge about the normal duration of connections,
2476 * MAY override this as appropriate.
2477 */
2478 if (xs_addr(upper_xprt)->sa_family == PF_INET6)
2479 ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2480
2481 xs_tcp_set_socket_timeouts(upper_xprt, sock);
2482 tcp_sock_set_nodelay(sk);
2483
2484 lock_sock(sk);
2485
2486 /* @sk is already connected, so it now has the RPC callbacks.
2487 * Reach into @lower_transport to save the original ones.
2488 */
2489 upper_transport->old_data_ready = lower_transport->old_data_ready;
2490 upper_transport->old_state_change = lower_transport->old_state_change;
2491 upper_transport->old_write_space = lower_transport->old_write_space;
2492 upper_transport->old_error_report = lower_transport->old_error_report;
2493 sk->sk_user_data = upper_xprt;
2494
2495 /* socket options */
2496 sock_reset_flag(sk, SOCK_LINGER);
2497
2498 xprt_clear_connected(upper_xprt);
2499
2500 upper_transport->sock = sock;
2501 upper_transport->inet = sk;
2502 upper_transport->file = lower_transport->file;
2503
2504 release_sock(sk);
2505
2506 /* Reset lower_transport before shutting down its clnt */
2507 mutex_lock(&lower_transport->recv_mutex);
2508 lower_transport->inet = NULL;
2509 lower_transport->sock = NULL;
2510 lower_transport->file = NULL;
2511
2512 xprt_clear_connected(lower_xprt);
2513 xs_sock_reset_connection_flags(lower_xprt);
2514 xs_stream_reset_connect(lower_transport);
2515 mutex_unlock(&lower_transport->recv_mutex);
2516 }
2517
2518 if (!xprt_bound(upper_xprt))
2519 return -ENOTCONN;
2520
2521 xs_set_memalloc(upper_xprt);
2522
2523 if (!xprt_test_and_set_connected(upper_xprt)) {
2524 upper_xprt->connect_cookie++;
2525 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2526 xprt_clear_connecting(upper_xprt);
2527
2528 upper_xprt->stat.connect_count++;
2529 upper_xprt->stat.connect_time += (long)jiffies -
2530 upper_xprt->stat.connect_start;
2531 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2532 }
2533 return 0;
2534}
2535
2536/**
2537 * xs_tls_handshake_done - TLS handshake completion handler
2538 * @data: address of xprt to wake
2539 * @status: status of handshake
2540 * @peerid: serial number of key containing the remote's identity
2541 *
2542 */
2543static void xs_tls_handshake_done(void *data, int status, key_serial_t peerid)
2544{
2545 struct rpc_xprt *lower_xprt = data;
2546 struct sock_xprt *lower_transport =
2547 container_of(lower_xprt, struct sock_xprt, xprt);
2548
2549 lower_transport->xprt_err = status ? -EACCES : 0;
2550 complete(&lower_transport->handshake_done);
2551 xprt_put(lower_xprt);
2552}
2553
2554static int xs_tls_handshake_sync(struct rpc_xprt *lower_xprt, struct xprtsec_parms *xprtsec)
2555{
2556 struct sock_xprt *lower_transport =
2557 container_of(lower_xprt, struct sock_xprt, xprt);
2558 struct tls_handshake_args args = {
2559 .ta_sock = lower_transport->sock,
2560 .ta_done = xs_tls_handshake_done,
2561 .ta_data = xprt_get(lower_xprt),
2562 .ta_peername = lower_xprt->servername,
2563 };
2564 struct sock *sk = lower_transport->inet;
2565 int rc;
2566
2567 init_completion(&lower_transport->handshake_done);
2568 set_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2569 lower_transport->xprt_err = -ETIMEDOUT;
2570 switch (xprtsec->policy) {
2571 case RPC_XPRTSEC_TLS_ANON:
2572 rc = tls_client_hello_anon(&args, GFP_KERNEL);
2573 if (rc)
2574 goto out_put_xprt;
2575 break;
2576 case RPC_XPRTSEC_TLS_X509:
2577 args.ta_my_cert = xprtsec->cert_serial;
2578 args.ta_my_privkey = xprtsec->privkey_serial;
2579 rc = tls_client_hello_x509(&args, GFP_KERNEL);
2580 if (rc)
2581 goto out_put_xprt;
2582 break;
2583 default:
2584 rc = -EACCES;
2585 goto out_put_xprt;
2586 }
2587
2588 rc = wait_for_completion_interruptible_timeout(&lower_transport->handshake_done,
2589 XS_TLS_HANDSHAKE_TO);
2590 if (rc <= 0) {
2591 if (!tls_handshake_cancel(sk)) {
2592 if (rc == 0)
2593 rc = -ETIMEDOUT;
2594 goto out_put_xprt;
2595 }
2596 }
2597
2598 rc = lower_transport->xprt_err;
2599
2600out:
2601 xs_stream_reset_connect(lower_transport);
2602 clear_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2603 return rc;
2604
2605out_put_xprt:
2606 xprt_put(lower_xprt);
2607 goto out;
2608}
2609
2610/**
2611 * xs_tcp_tls_setup_socket - establish a TLS session on a TCP socket
2612 * @work: queued work item
2613 *
2614 * Invoked by a work queue tasklet.
2615 *
2616 * For RPC-with-TLS, there is a two-stage connection process.
2617 *
2618 * The "upper-layer xprt" is visible to the RPC consumer. Once it has
2619 * been marked connected, the consumer knows that a TCP connection and
2620 * a TLS session have been established.
2621 *
2622 * A "lower-layer xprt", created in this function, handles the mechanics
2623 * of connecting the TCP socket, performing the RPC_AUTH_TLS probe, and
2624 * then driving the TLS handshake. Once all that is complete, the upper
2625 * layer xprt is marked connected.
2626 */
2627static void xs_tcp_tls_setup_socket(struct work_struct *work)
2628{
2629 struct sock_xprt *upper_transport =
2630 container_of(work, struct sock_xprt, connect_worker.work);
2631 struct rpc_clnt *upper_clnt = upper_transport->clnt;
2632 struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2633 struct rpc_create_args args = {
2634 .net = upper_xprt->xprt_net,
2635 .protocol = upper_xprt->prot,
2636 .address = (struct sockaddr *)&upper_xprt->addr,
2637 .addrsize = upper_xprt->addrlen,
2638 .timeout = upper_clnt->cl_timeout,
2639 .servername = upper_xprt->servername,
2640 .program = upper_clnt->cl_program,
2641 .prognumber = upper_clnt->cl_prog,
2642 .version = upper_clnt->cl_vers,
2643 .authflavor = RPC_AUTH_TLS,
2644 .cred = upper_clnt->cl_cred,
2645 .xprtsec = {
2646 .policy = RPC_XPRTSEC_NONE,
2647 },
2648 };
2649 unsigned int pflags = current->flags;
2650 struct rpc_clnt *lower_clnt;
2651 struct rpc_xprt *lower_xprt;
2652 int status;
2653
2654 if (atomic_read(&upper_xprt->swapper))
2655 current->flags |= PF_MEMALLOC;
2656
2657 xs_stream_start_connect(upper_transport);
2658
2659 /* This implicitly sends an RPC_AUTH_TLS probe */
2660 lower_clnt = rpc_create(&args);
2661 if (IS_ERR(lower_clnt)) {
2662 trace_rpc_tls_unavailable(upper_clnt, upper_xprt);
2663 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2664 xprt_clear_connecting(upper_xprt);
2665 xprt_wake_pending_tasks(upper_xprt, PTR_ERR(lower_clnt));
2666 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2667 goto out_unlock;
2668 }
2669
2670 /* RPC_AUTH_TLS probe was successful. Try a TLS handshake on
2671 * the lower xprt.
2672 */
2673 rcu_read_lock();
2674 lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
2675 rcu_read_unlock();
2676
2677 if (wait_on_bit_lock(&lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2678 goto out_unlock;
2679
2680 status = xs_tls_handshake_sync(lower_xprt, &upper_xprt->xprtsec);
2681 if (status) {
2682 trace_rpc_tls_not_started(upper_clnt, upper_xprt);
2683 goto out_close;
2684 }
2685
2686 status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
2687 if (status)
2688 goto out_close;
2689 xprt_release_write(lower_xprt, NULL);
2690
2691 trace_rpc_socket_connect(upper_xprt, upper_transport->sock, 0);
2692 if (!xprt_test_and_set_connected(upper_xprt)) {
2693 upper_xprt->connect_cookie++;
2694 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2695 xprt_clear_connecting(upper_xprt);
2696
2697 upper_xprt->stat.connect_count++;
2698 upper_xprt->stat.connect_time += (long)jiffies -
2699 upper_xprt->stat.connect_start;
2700 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2701 }
2702 rpc_shutdown_client(lower_clnt);
2703
2704out_unlock:
2705 current_restore_flags(pflags, PF_MEMALLOC);
2706 upper_transport->clnt = NULL;
2707 xprt_unlock_connect(upper_xprt, upper_transport);
2708 return;
2709
2710out_close:
2711 xprt_release_write(lower_xprt, NULL);
2712 rpc_shutdown_client(lower_clnt);
2713
2714 /* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2715 * Wake them first here to ensure they get our tk_status code.
2716 */
2717 xprt_wake_pending_tasks(upper_xprt, status);
2718 xs_tcp_force_close(upper_xprt);
2719 xprt_clear_connecting(upper_xprt);
2720 goto out_unlock;
2721}
2722
2723/**
2724 * xs_connect - connect a socket to a remote endpoint
2725 * @xprt: pointer to transport structure
2726 * @task: address of RPC task that manages state of connect request
2727 *
2728 * TCP: If the remote end dropped the connection, delay reconnecting.
2729 *
2730 * UDP socket connects are synchronous, but we use a work queue anyway
2731 * to guarantee that even unprivileged user processes can set up a
2732 * socket on a privileged port.
2733 *
2734 * If a UDP socket connect fails, the delay behavior here prevents
2735 * retry floods (hard mounts).
2736 */
2737static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2738{
2739 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2740 unsigned long delay = 0;
2741
2742 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2743
2744 if (transport->sock != NULL) {
2745 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2746 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2747
2748 delay = xprt_reconnect_delay(xprt);
2749 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2750
2751 } else
2752 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2753
2754 transport->clnt = task->tk_client;
2755 queue_delayed_work(xprtiod_workqueue,
2756 &transport->connect_worker,
2757 delay);
2758}
2759
2760static void xs_wake_disconnect(struct sock_xprt *transport)
2761{
2762 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2763 xs_tcp_force_close(&transport->xprt);
2764}
2765
2766static void xs_wake_write(struct sock_xprt *transport)
2767{
2768 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2769 xprt_write_space(&transport->xprt);
2770}
2771
2772static void xs_wake_error(struct sock_xprt *transport)
2773{
2774 int sockerr;
2775
2776 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2777 return;
2778 sockerr = xchg(&transport->xprt_err, 0);
2779 if (sockerr < 0) {
2780 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2781 xs_tcp_force_close(&transport->xprt);
2782 }
2783}
2784
2785static void xs_wake_pending(struct sock_xprt *transport)
2786{
2787 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2788 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2789}
2790
2791static void xs_error_handle(struct work_struct *work)
2792{
2793 struct sock_xprt *transport = container_of(work,
2794 struct sock_xprt, error_worker);
2795
2796 xs_wake_disconnect(transport);
2797 xs_wake_write(transport);
2798 xs_wake_error(transport);
2799 xs_wake_pending(transport);
2800}
2801
2802/**
2803 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2804 * @xprt: rpc_xprt struct containing statistics
2805 * @seq: output file
2806 *
2807 */
2808static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2809{
2810 long idle_time = 0;
2811
2812 if (xprt_connected(xprt))
2813 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2814
2815 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2816 "%llu %llu %lu %llu %llu\n",
2817 xprt->stat.bind_count,
2818 xprt->stat.connect_count,
2819 xprt->stat.connect_time / HZ,
2820 idle_time,
2821 xprt->stat.sends,
2822 xprt->stat.recvs,
2823 xprt->stat.bad_xids,
2824 xprt->stat.req_u,
2825 xprt->stat.bklog_u,
2826 xprt->stat.max_slots,
2827 xprt->stat.sending_u,
2828 xprt->stat.pending_u);
2829}
2830
2831/**
2832 * xs_udp_print_stats - display UDP socket-specific stats
2833 * @xprt: rpc_xprt struct containing statistics
2834 * @seq: output file
2835 *
2836 */
2837static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2838{
2839 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2840
2841 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2842 "%lu %llu %llu\n",
2843 transport->srcport,
2844 xprt->stat.bind_count,
2845 xprt->stat.sends,
2846 xprt->stat.recvs,
2847 xprt->stat.bad_xids,
2848 xprt->stat.req_u,
2849 xprt->stat.bklog_u,
2850 xprt->stat.max_slots,
2851 xprt->stat.sending_u,
2852 xprt->stat.pending_u);
2853}
2854
2855/**
2856 * xs_tcp_print_stats - display TCP socket-specific stats
2857 * @xprt: rpc_xprt struct containing statistics
2858 * @seq: output file
2859 *
2860 */
2861static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2862{
2863 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2864 long idle_time = 0;
2865
2866 if (xprt_connected(xprt))
2867 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2868
2869 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2870 "%llu %llu %lu %llu %llu\n",
2871 transport->srcport,
2872 xprt->stat.bind_count,
2873 xprt->stat.connect_count,
2874 xprt->stat.connect_time / HZ,
2875 idle_time,
2876 xprt->stat.sends,
2877 xprt->stat.recvs,
2878 xprt->stat.bad_xids,
2879 xprt->stat.req_u,
2880 xprt->stat.bklog_u,
2881 xprt->stat.max_slots,
2882 xprt->stat.sending_u,
2883 xprt->stat.pending_u);
2884}
2885
2886/*
2887 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2888 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2889 * to use the server side send routines.
2890 */
2891static int bc_malloc(struct rpc_task *task)
2892{
2893 struct rpc_rqst *rqst = task->tk_rqstp;
2894 size_t size = rqst->rq_callsize;
2895 struct page *page;
2896 struct rpc_buffer *buf;
2897
2898 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2899 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2900 size);
2901 return -EINVAL;
2902 }
2903
2904 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2905 if (!page)
2906 return -ENOMEM;
2907
2908 buf = page_address(page);
2909 buf->len = PAGE_SIZE;
2910
2911 rqst->rq_buffer = buf->data;
2912 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2913 return 0;
2914}
2915
2916/*
2917 * Free the space allocated in the bc_alloc routine
2918 */
2919static void bc_free(struct rpc_task *task)
2920{
2921 void *buffer = task->tk_rqstp->rq_buffer;
2922 struct rpc_buffer *buf;
2923
2924 buf = container_of(buffer, struct rpc_buffer, data);
2925 free_page((unsigned long)buf);
2926}
2927
2928static int bc_sendto(struct rpc_rqst *req)
2929{
2930 struct xdr_buf *xdr = &req->rq_snd_buf;
2931 struct sock_xprt *transport =
2932 container_of(req->rq_xprt, struct sock_xprt, xprt);
2933 struct msghdr msg = {
2934 .msg_flags = 0,
2935 };
2936 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2937 (u32)xdr->len);
2938 unsigned int sent = 0;
2939 int err;
2940
2941 req->rq_xtime = ktime_get();
2942 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2943 if (err < 0)
2944 return err;
2945 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2946 xdr_free_bvec(xdr);
2947 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2948 return -EAGAIN;
2949 return sent;
2950}
2951
2952/**
2953 * bc_send_request - Send a backchannel Call on a TCP socket
2954 * @req: rpc_rqst containing Call message to be sent
2955 *
2956 * xpt_mutex ensures @rqstp's whole message is written to the socket
2957 * without interruption.
2958 *
2959 * Return values:
2960 * %0 if the message was sent successfully
2961 * %ENOTCONN if the message was not sent
2962 */
2963static int bc_send_request(struct rpc_rqst *req)
2964{
2965 struct svc_xprt *xprt;
2966 int len;
2967
2968 /*
2969 * Get the server socket associated with this callback xprt
2970 */
2971 xprt = req->rq_xprt->bc_xprt;
2972
2973 /*
2974 * Grab the mutex to serialize data as the connection is shared
2975 * with the fore channel
2976 */
2977 mutex_lock(&xprt->xpt_mutex);
2978 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2979 len = -ENOTCONN;
2980 else
2981 len = bc_sendto(req);
2982 mutex_unlock(&xprt->xpt_mutex);
2983
2984 if (len > 0)
2985 len = 0;
2986
2987 return len;
2988}
2989
2990/*
2991 * The close routine. Since this is client initiated, we do nothing
2992 */
2993
2994static void bc_close(struct rpc_xprt *xprt)
2995{
2996 xprt_disconnect_done(xprt);
2997}
2998
2999/*
3000 * The xprt destroy routine. Again, because this connection is client
3001 * initiated, we do nothing
3002 */
3003
3004static void bc_destroy(struct rpc_xprt *xprt)
3005{
3006 dprintk("RPC: bc_destroy xprt %p\n", xprt);
3007
3008 xs_xprt_free(xprt);
3009 module_put(THIS_MODULE);
3010}
3011
3012static const struct rpc_xprt_ops xs_local_ops = {
3013 .reserve_xprt = xprt_reserve_xprt,
3014 .release_xprt = xprt_release_xprt,
3015 .alloc_slot = xprt_alloc_slot,
3016 .free_slot = xprt_free_slot,
3017 .rpcbind = xs_local_rpcbind,
3018 .set_port = xs_local_set_port,
3019 .connect = xs_local_connect,
3020 .buf_alloc = rpc_malloc,
3021 .buf_free = rpc_free,
3022 .prepare_request = xs_stream_prepare_request,
3023 .send_request = xs_local_send_request,
3024 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3025 .close = xs_close,
3026 .destroy = xs_destroy,
3027 .print_stats = xs_local_print_stats,
3028 .enable_swap = xs_enable_swap,
3029 .disable_swap = xs_disable_swap,
3030};
3031
3032static const struct rpc_xprt_ops xs_udp_ops = {
3033 .set_buffer_size = xs_udp_set_buffer_size,
3034 .reserve_xprt = xprt_reserve_xprt_cong,
3035 .release_xprt = xprt_release_xprt_cong,
3036 .alloc_slot = xprt_alloc_slot,
3037 .free_slot = xprt_free_slot,
3038 .rpcbind = rpcb_getport_async,
3039 .set_port = xs_set_port,
3040 .connect = xs_connect,
3041 .get_srcaddr = xs_sock_srcaddr,
3042 .get_srcport = xs_sock_srcport,
3043 .buf_alloc = rpc_malloc,
3044 .buf_free = rpc_free,
3045 .send_request = xs_udp_send_request,
3046 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3047 .timer = xs_udp_timer,
3048 .release_request = xprt_release_rqst_cong,
3049 .close = xs_close,
3050 .destroy = xs_destroy,
3051 .print_stats = xs_udp_print_stats,
3052 .enable_swap = xs_enable_swap,
3053 .disable_swap = xs_disable_swap,
3054 .inject_disconnect = xs_inject_disconnect,
3055};
3056
3057static const struct rpc_xprt_ops xs_tcp_ops = {
3058 .reserve_xprt = xprt_reserve_xprt,
3059 .release_xprt = xprt_release_xprt,
3060 .alloc_slot = xprt_alloc_slot,
3061 .free_slot = xprt_free_slot,
3062 .rpcbind = rpcb_getport_async,
3063 .set_port = xs_set_port,
3064 .connect = xs_connect,
3065 .get_srcaddr = xs_sock_srcaddr,
3066 .get_srcport = xs_sock_srcport,
3067 .buf_alloc = rpc_malloc,
3068 .buf_free = rpc_free,
3069 .prepare_request = xs_stream_prepare_request,
3070 .send_request = xs_tcp_send_request,
3071 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3072 .close = xs_tcp_shutdown,
3073 .destroy = xs_destroy,
3074 .set_connect_timeout = xs_tcp_set_connect_timeout,
3075 .print_stats = xs_tcp_print_stats,
3076 .enable_swap = xs_enable_swap,
3077 .disable_swap = xs_disable_swap,
3078 .inject_disconnect = xs_inject_disconnect,
3079#ifdef CONFIG_SUNRPC_BACKCHANNEL
3080 .bc_setup = xprt_setup_bc,
3081 .bc_maxpayload = xs_tcp_bc_maxpayload,
3082 .bc_num_slots = xprt_bc_max_slots,
3083 .bc_free_rqst = xprt_free_bc_rqst,
3084 .bc_destroy = xprt_destroy_bc,
3085#endif
3086};
3087
3088/*
3089 * The rpc_xprt_ops for the server backchannel
3090 */
3091
3092static const struct rpc_xprt_ops bc_tcp_ops = {
3093 .reserve_xprt = xprt_reserve_xprt,
3094 .release_xprt = xprt_release_xprt,
3095 .alloc_slot = xprt_alloc_slot,
3096 .free_slot = xprt_free_slot,
3097 .buf_alloc = bc_malloc,
3098 .buf_free = bc_free,
3099 .send_request = bc_send_request,
3100 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3101 .close = bc_close,
3102 .destroy = bc_destroy,
3103 .print_stats = xs_tcp_print_stats,
3104 .enable_swap = xs_enable_swap,
3105 .disable_swap = xs_disable_swap,
3106 .inject_disconnect = xs_inject_disconnect,
3107};
3108
3109static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3110{
3111 static const struct sockaddr_in sin = {
3112 .sin_family = AF_INET,
3113 .sin_addr.s_addr = htonl(INADDR_ANY),
3114 };
3115 static const struct sockaddr_in6 sin6 = {
3116 .sin6_family = AF_INET6,
3117 .sin6_addr = IN6ADDR_ANY_INIT,
3118 };
3119
3120 switch (family) {
3121 case AF_LOCAL:
3122 break;
3123 case AF_INET:
3124 memcpy(sap, &sin, sizeof(sin));
3125 break;
3126 case AF_INET6:
3127 memcpy(sap, &sin6, sizeof(sin6));
3128 break;
3129 default:
3130 dprintk("RPC: %s: Bad address family\n", __func__);
3131 return -EAFNOSUPPORT;
3132 }
3133 return 0;
3134}
3135
3136static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3137 unsigned int slot_table_size,
3138 unsigned int max_slot_table_size)
3139{
3140 struct rpc_xprt *xprt;
3141 struct sock_xprt *new;
3142
3143 if (args->addrlen > sizeof(xprt->addr)) {
3144 dprintk("RPC: xs_setup_xprt: address too large\n");
3145 return ERR_PTR(-EBADF);
3146 }
3147
3148 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
3149 max_slot_table_size);
3150 if (xprt == NULL) {
3151 dprintk("RPC: xs_setup_xprt: couldn't allocate "
3152 "rpc_xprt\n");
3153 return ERR_PTR(-ENOMEM);
3154 }
3155
3156 new = container_of(xprt, struct sock_xprt, xprt);
3157 mutex_init(&new->recv_mutex);
3158 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3159 xprt->addrlen = args->addrlen;
3160 if (args->srcaddr)
3161 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3162 else {
3163 int err;
3164 err = xs_init_anyaddr(args->dstaddr->sa_family,
3165 (struct sockaddr *)&new->srcaddr);
3166 if (err != 0) {
3167 xprt_free(xprt);
3168 return ERR_PTR(err);
3169 }
3170 }
3171
3172 return xprt;
3173}
3174
3175static const struct rpc_timeout xs_local_default_timeout = {
3176 .to_initval = 10 * HZ,
3177 .to_maxval = 10 * HZ,
3178 .to_retries = 2,
3179};
3180
3181/**
3182 * xs_setup_local - Set up transport to use an AF_LOCAL socket
3183 * @args: rpc transport creation arguments
3184 *
3185 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3186 */
3187static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3188{
3189 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3190 struct sock_xprt *transport;
3191 struct rpc_xprt *xprt;
3192 struct rpc_xprt *ret;
3193
3194 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3195 xprt_max_tcp_slot_table_entries);
3196 if (IS_ERR(xprt))
3197 return xprt;
3198 transport = container_of(xprt, struct sock_xprt, xprt);
3199
3200 xprt->prot = 0;
3201 xprt->xprt_class = &xs_local_transport;
3202 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3203
3204 xprt->bind_timeout = XS_BIND_TO;
3205 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3206 xprt->idle_timeout = XS_IDLE_DISC_TO;
3207
3208 xprt->ops = &xs_local_ops;
3209 xprt->timeout = &xs_local_default_timeout;
3210
3211 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3212 INIT_WORK(&transport->error_worker, xs_error_handle);
3213 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3214
3215 switch (sun->sun_family) {
3216 case AF_LOCAL:
3217 if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3218 dprintk("RPC: bad AF_LOCAL address: %s\n",
3219 sun->sun_path);
3220 ret = ERR_PTR(-EINVAL);
3221 goto out_err;
3222 }
3223 xprt_set_bound(xprt);
3224 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
3225 break;
3226 default:
3227 ret = ERR_PTR(-EAFNOSUPPORT);
3228 goto out_err;
3229 }
3230
3231 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
3232 xprt->address_strings[RPC_DISPLAY_ADDR]);
3233
3234 if (try_module_get(THIS_MODULE))
3235 return xprt;
3236 ret = ERR_PTR(-EINVAL);
3237out_err:
3238 xs_xprt_free(xprt);
3239 return ret;
3240}
3241
3242static const struct rpc_timeout xs_udp_default_timeout = {
3243 .to_initval = 5 * HZ,
3244 .to_maxval = 30 * HZ,
3245 .to_increment = 5 * HZ,
3246 .to_retries = 5,
3247};
3248
3249/**
3250 * xs_setup_udp - Set up transport to use a UDP socket
3251 * @args: rpc transport creation arguments
3252 *
3253 */
3254static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3255{
3256 struct sockaddr *addr = args->dstaddr;
3257 struct rpc_xprt *xprt;
3258 struct sock_xprt *transport;
3259 struct rpc_xprt *ret;
3260
3261 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3262 xprt_udp_slot_table_entries);
3263 if (IS_ERR(xprt))
3264 return xprt;
3265 transport = container_of(xprt, struct sock_xprt, xprt);
3266
3267 xprt->prot = IPPROTO_UDP;
3268 xprt->xprt_class = &xs_udp_transport;
3269 /* XXX: header size can vary due to auth type, IPv6, etc. */
3270 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3271
3272 xprt->bind_timeout = XS_BIND_TO;
3273 xprt->reestablish_timeout = XS_UDP_REEST_TO;
3274 xprt->idle_timeout = XS_IDLE_DISC_TO;
3275
3276 xprt->ops = &xs_udp_ops;
3277
3278 xprt->timeout = &xs_udp_default_timeout;
3279
3280 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3281 INIT_WORK(&transport->error_worker, xs_error_handle);
3282 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3283
3284 switch (addr->sa_family) {
3285 case AF_INET:
3286 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3287 xprt_set_bound(xprt);
3288
3289 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3290 break;
3291 case AF_INET6:
3292 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3293 xprt_set_bound(xprt);
3294
3295 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3296 break;
3297 default:
3298 ret = ERR_PTR(-EAFNOSUPPORT);
3299 goto out_err;
3300 }
3301
3302 if (xprt_bound(xprt))
3303 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3304 xprt->address_strings[RPC_DISPLAY_ADDR],
3305 xprt->address_strings[RPC_DISPLAY_PORT],
3306 xprt->address_strings[RPC_DISPLAY_PROTO]);
3307 else
3308 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3309 xprt->address_strings[RPC_DISPLAY_ADDR],
3310 xprt->address_strings[RPC_DISPLAY_PROTO]);
3311
3312 if (try_module_get(THIS_MODULE))
3313 return xprt;
3314 ret = ERR_PTR(-EINVAL);
3315out_err:
3316 xs_xprt_free(xprt);
3317 return ret;
3318}
3319
3320static const struct rpc_timeout xs_tcp_default_timeout = {
3321 .to_initval = 60 * HZ,
3322 .to_maxval = 60 * HZ,
3323 .to_retries = 2,
3324};
3325
3326/**
3327 * xs_setup_tcp - Set up transport to use a TCP socket
3328 * @args: rpc transport creation arguments
3329 *
3330 */
3331static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3332{
3333 struct sockaddr *addr = args->dstaddr;
3334 struct rpc_xprt *xprt;
3335 struct sock_xprt *transport;
3336 struct rpc_xprt *ret;
3337 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3338
3339 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3340 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3341
3342 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3343 max_slot_table_size);
3344 if (IS_ERR(xprt))
3345 return xprt;
3346 transport = container_of(xprt, struct sock_xprt, xprt);
3347
3348 xprt->prot = IPPROTO_TCP;
3349 xprt->xprt_class = &xs_tcp_transport;
3350 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3351
3352 xprt->bind_timeout = XS_BIND_TO;
3353 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3354 xprt->idle_timeout = XS_IDLE_DISC_TO;
3355
3356 xprt->ops = &xs_tcp_ops;
3357 xprt->timeout = &xs_tcp_default_timeout;
3358
3359 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3360 if (args->reconnect_timeout)
3361 xprt->max_reconnect_timeout = args->reconnect_timeout;
3362
3363 xprt->connect_timeout = xprt->timeout->to_initval *
3364 (xprt->timeout->to_retries + 1);
3365 if (args->connect_timeout)
3366 xs_tcp_do_set_connect_timeout(xprt, args->connect_timeout);
3367
3368 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3369 INIT_WORK(&transport->error_worker, xs_error_handle);
3370 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3371
3372 switch (addr->sa_family) {
3373 case AF_INET:
3374 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3375 xprt_set_bound(xprt);
3376
3377 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3378 break;
3379 case AF_INET6:
3380 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3381 xprt_set_bound(xprt);
3382
3383 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3384 break;
3385 default:
3386 ret = ERR_PTR(-EAFNOSUPPORT);
3387 goto out_err;
3388 }
3389
3390 if (xprt_bound(xprt))
3391 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3392 xprt->address_strings[RPC_DISPLAY_ADDR],
3393 xprt->address_strings[RPC_DISPLAY_PORT],
3394 xprt->address_strings[RPC_DISPLAY_PROTO]);
3395 else
3396 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3397 xprt->address_strings[RPC_DISPLAY_ADDR],
3398 xprt->address_strings[RPC_DISPLAY_PROTO]);
3399
3400 if (try_module_get(THIS_MODULE))
3401 return xprt;
3402 ret = ERR_PTR(-EINVAL);
3403out_err:
3404 xs_xprt_free(xprt);
3405 return ret;
3406}
3407
3408/**
3409 * xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3410 * @args: rpc transport creation arguments
3411 *
3412 */
3413static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3414{
3415 struct sockaddr *addr = args->dstaddr;
3416 struct rpc_xprt *xprt;
3417 struct sock_xprt *transport;
3418 struct rpc_xprt *ret;
3419 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3420
3421 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3422 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3423
3424 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3425 max_slot_table_size);
3426 if (IS_ERR(xprt))
3427 return xprt;
3428 transport = container_of(xprt, struct sock_xprt, xprt);
3429
3430 xprt->prot = IPPROTO_TCP;
3431 xprt->xprt_class = &xs_tcp_transport;
3432 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3433
3434 xprt->bind_timeout = XS_BIND_TO;
3435 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3436 xprt->idle_timeout = XS_IDLE_DISC_TO;
3437
3438 xprt->ops = &xs_tcp_ops;
3439 xprt->timeout = &xs_tcp_default_timeout;
3440
3441 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3442 xprt->connect_timeout = xprt->timeout->to_initval *
3443 (xprt->timeout->to_retries + 1);
3444
3445 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3446 INIT_WORK(&transport->error_worker, xs_error_handle);
3447
3448 switch (args->xprtsec.policy) {
3449 case RPC_XPRTSEC_TLS_ANON:
3450 case RPC_XPRTSEC_TLS_X509:
3451 xprt->xprtsec = args->xprtsec;
3452 INIT_DELAYED_WORK(&transport->connect_worker,
3453 xs_tcp_tls_setup_socket);
3454 break;
3455 default:
3456 ret = ERR_PTR(-EACCES);
3457 goto out_err;
3458 }
3459
3460 switch (addr->sa_family) {
3461 case AF_INET:
3462 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3463 xprt_set_bound(xprt);
3464
3465 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3466 break;
3467 case AF_INET6:
3468 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3469 xprt_set_bound(xprt);
3470
3471 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3472 break;
3473 default:
3474 ret = ERR_PTR(-EAFNOSUPPORT);
3475 goto out_err;
3476 }
3477
3478 if (xprt_bound(xprt))
3479 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3480 xprt->address_strings[RPC_DISPLAY_ADDR],
3481 xprt->address_strings[RPC_DISPLAY_PORT],
3482 xprt->address_strings[RPC_DISPLAY_PROTO]);
3483 else
3484 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3485 xprt->address_strings[RPC_DISPLAY_ADDR],
3486 xprt->address_strings[RPC_DISPLAY_PROTO]);
3487
3488 if (try_module_get(THIS_MODULE))
3489 return xprt;
3490 ret = ERR_PTR(-EINVAL);
3491out_err:
3492 xs_xprt_free(xprt);
3493 return ret;
3494}
3495
3496/**
3497 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3498 * @args: rpc transport creation arguments
3499 *
3500 */
3501static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3502{
3503 struct sockaddr *addr = args->dstaddr;
3504 struct rpc_xprt *xprt;
3505 struct sock_xprt *transport;
3506 struct svc_sock *bc_sock;
3507 struct rpc_xprt *ret;
3508
3509 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3510 xprt_tcp_slot_table_entries);
3511 if (IS_ERR(xprt))
3512 return xprt;
3513 transport = container_of(xprt, struct sock_xprt, xprt);
3514
3515 xprt->prot = IPPROTO_TCP;
3516 xprt->xprt_class = &xs_bc_tcp_transport;
3517 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3518 xprt->timeout = &xs_tcp_default_timeout;
3519
3520 /* backchannel */
3521 xprt_set_bound(xprt);
3522 xprt->bind_timeout = 0;
3523 xprt->reestablish_timeout = 0;
3524 xprt->idle_timeout = 0;
3525
3526 xprt->ops = &bc_tcp_ops;
3527
3528 switch (addr->sa_family) {
3529 case AF_INET:
3530 xs_format_peer_addresses(xprt, "tcp",
3531 RPCBIND_NETID_TCP);
3532 break;
3533 case AF_INET6:
3534 xs_format_peer_addresses(xprt, "tcp",
3535 RPCBIND_NETID_TCP6);
3536 break;
3537 default:
3538 ret = ERR_PTR(-EAFNOSUPPORT);
3539 goto out_err;
3540 }
3541
3542 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3543 xprt->address_strings[RPC_DISPLAY_ADDR],
3544 xprt->address_strings[RPC_DISPLAY_PORT],
3545 xprt->address_strings[RPC_DISPLAY_PROTO]);
3546
3547 /*
3548 * Once we've associated a backchannel xprt with a connection,
3549 * we want to keep it around as long as the connection lasts,
3550 * in case we need to start using it for a backchannel again;
3551 * this reference won't be dropped until bc_xprt is destroyed.
3552 */
3553 xprt_get(xprt);
3554 args->bc_xprt->xpt_bc_xprt = xprt;
3555 xprt->bc_xprt = args->bc_xprt;
3556 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3557 transport->sock = bc_sock->sk_sock;
3558 transport->inet = bc_sock->sk_sk;
3559
3560 /*
3561 * Since we don't want connections for the backchannel, we set
3562 * the xprt status to connected
3563 */
3564 xprt_set_connected(xprt);
3565
3566 if (try_module_get(THIS_MODULE))
3567 return xprt;
3568
3569 args->bc_xprt->xpt_bc_xprt = NULL;
3570 args->bc_xprt->xpt_bc_xps = NULL;
3571 xprt_put(xprt);
3572 ret = ERR_PTR(-EINVAL);
3573out_err:
3574 xs_xprt_free(xprt);
3575 return ret;
3576}
3577
3578static struct xprt_class xs_local_transport = {
3579 .list = LIST_HEAD_INIT(xs_local_transport.list),
3580 .name = "named UNIX socket",
3581 .owner = THIS_MODULE,
3582 .ident = XPRT_TRANSPORT_LOCAL,
3583 .setup = xs_setup_local,
3584 .netid = { "" },
3585};
3586
3587static struct xprt_class xs_udp_transport = {
3588 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3589 .name = "udp",
3590 .owner = THIS_MODULE,
3591 .ident = XPRT_TRANSPORT_UDP,
3592 .setup = xs_setup_udp,
3593 .netid = { "udp", "udp6", "" },
3594};
3595
3596static struct xprt_class xs_tcp_transport = {
3597 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3598 .name = "tcp",
3599 .owner = THIS_MODULE,
3600 .ident = XPRT_TRANSPORT_TCP,
3601 .setup = xs_setup_tcp,
3602 .netid = { "tcp", "tcp6", "" },
3603};
3604
3605static struct xprt_class xs_tcp_tls_transport = {
3606 .list = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3607 .name = "tcp-with-tls",
3608 .owner = THIS_MODULE,
3609 .ident = XPRT_TRANSPORT_TCP_TLS,
3610 .setup = xs_setup_tcp_tls,
3611 .netid = { "tcp", "tcp6", "" },
3612};
3613
3614static struct xprt_class xs_bc_tcp_transport = {
3615 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3616 .name = "tcp NFSv4.1 backchannel",
3617 .owner = THIS_MODULE,
3618 .ident = XPRT_TRANSPORT_BC_TCP,
3619 .setup = xs_setup_bc_tcp,
3620 .netid = { "" },
3621};
3622
3623/**
3624 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3625 *
3626 */
3627int init_socket_xprt(void)
3628{
3629 if (!sunrpc_table_header)
3630 sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3631
3632 xprt_register_transport(&xs_local_transport);
3633 xprt_register_transport(&xs_udp_transport);
3634 xprt_register_transport(&xs_tcp_transport);
3635 xprt_register_transport(&xs_tcp_tls_transport);
3636 xprt_register_transport(&xs_bc_tcp_transport);
3637
3638 return 0;
3639}
3640
3641/**
3642 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3643 *
3644 */
3645void cleanup_socket_xprt(void)
3646{
3647 if (sunrpc_table_header) {
3648 unregister_sysctl_table(sunrpc_table_header);
3649 sunrpc_table_header = NULL;
3650 }
3651
3652 xprt_unregister_transport(&xs_local_transport);
3653 xprt_unregister_transport(&xs_udp_transport);
3654 xprt_unregister_transport(&xs_tcp_transport);
3655 xprt_unregister_transport(&xs_tcp_tls_transport);
3656 xprt_unregister_transport(&xs_bc_tcp_transport);
3657}
3658
3659static int param_set_portnr(const char *val, const struct kernel_param *kp)
3660{
3661 return param_set_uint_minmax(val, kp,
3662 RPC_MIN_RESVPORT,
3663 RPC_MAX_RESVPORT);
3664}
3665
3666static const struct kernel_param_ops param_ops_portnr = {
3667 .set = param_set_portnr,
3668 .get = param_get_uint,
3669};
3670
3671#define param_check_portnr(name, p) \
3672 __param_check(name, p, unsigned int);
3673
3674module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3675module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3676
3677static int param_set_slot_table_size(const char *val,
3678 const struct kernel_param *kp)
3679{
3680 return param_set_uint_minmax(val, kp,
3681 RPC_MIN_SLOT_TABLE,
3682 RPC_MAX_SLOT_TABLE);
3683}
3684
3685static const struct kernel_param_ops param_ops_slot_table_size = {
3686 .set = param_set_slot_table_size,
3687 .get = param_get_uint,
3688};
3689
3690#define param_check_slot_table_size(name, p) \
3691 __param_check(name, p, unsigned int);
3692
3693static int param_set_max_slot_table_size(const char *val,
3694 const struct kernel_param *kp)
3695{
3696 return param_set_uint_minmax(val, kp,
3697 RPC_MIN_SLOT_TABLE,
3698 RPC_MAX_SLOT_TABLE_LIMIT);
3699}
3700
3701static const struct kernel_param_ops param_ops_max_slot_table_size = {
3702 .set = param_set_max_slot_table_size,
3703 .get = param_get_uint,
3704};
3705
3706#define param_check_max_slot_table_size(name, p) \
3707 __param_check(name, p, unsigned int);
3708
3709module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3710 slot_table_size, 0644);
3711module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3712 max_slot_table_size, 0644);
3713module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3714 slot_table_size, 0644);
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/sched.h>
37#include <linux/sunrpc/svcsock.h>
38#include <linux/sunrpc/xprtsock.h>
39#include <linux/file.h>
40#ifdef CONFIG_SUNRPC_BACKCHANNEL
41#include <linux/sunrpc/bc_xprt.h>
42#endif
43
44#include <net/sock.h>
45#include <net/checksum.h>
46#include <net/udp.h>
47#include <net/tcp.h>
48
49#include "sunrpc.h"
50
51static void xs_close(struct rpc_xprt *xprt);
52
53/*
54 * xprtsock tunables
55 */
56static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
57static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
58static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
59
60static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
61static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
62
63#define XS_TCP_LINGER_TO (15U * HZ)
64static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
65
66/*
67 * We can register our own files under /proc/sys/sunrpc by
68 * calling register_sysctl_table() again. The files in that
69 * directory become the union of all files registered there.
70 *
71 * We simply need to make sure that we don't collide with
72 * someone else's file names!
73 */
74
75#ifdef RPC_DEBUG
76
77static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
78static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
79static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
80static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
81static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
82
83static struct ctl_table_header *sunrpc_table_header;
84
85/*
86 * FIXME: changing the UDP slot table size should also resize the UDP
87 * socket buffers for existing UDP transports
88 */
89static ctl_table xs_tunables_table[] = {
90 {
91 .procname = "udp_slot_table_entries",
92 .data = &xprt_udp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
95 .proc_handler = proc_dointvec_minmax,
96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
100 .procname = "tcp_slot_table_entries",
101 .data = &xprt_tcp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
104 .proc_handler = proc_dointvec_minmax,
105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
109 .procname = "tcp_max_slot_table_entries",
110 .data = &xprt_max_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_tcp_slot_table_limit
116 },
117 {
118 .procname = "min_resvport",
119 .data = &xprt_min_resvport,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec_minmax,
123 .extra1 = &xprt_min_resvport_limit,
124 .extra2 = &xprt_max_resvport_limit
125 },
126 {
127 .procname = "max_resvport",
128 .data = &xprt_max_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_minmax,
132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
135 {
136 .procname = "tcp_fin_timeout",
137 .data = &xs_tcp_fin_timeout,
138 .maxlen = sizeof(xs_tcp_fin_timeout),
139 .mode = 0644,
140 .proc_handler = proc_dointvec_jiffies,
141 },
142 { },
143};
144
145static ctl_table sunrpc_table[] = {
146 {
147 .procname = "sunrpc",
148 .mode = 0555,
149 .child = xs_tunables_table
150 },
151 { },
152};
153
154#endif
155
156/*
157 * Wait duration for a reply from the RPC portmapper.
158 */
159#define XS_BIND_TO (60U * HZ)
160
161/*
162 * Delay if a UDP socket connect error occurs. This is most likely some
163 * kind of resource problem on the local host.
164 */
165#define XS_UDP_REEST_TO (2U * HZ)
166
167/*
168 * The reestablish timeout allows clients to delay for a bit before attempting
169 * to reconnect to a server that just dropped our connection.
170 *
171 * We implement an exponential backoff when trying to reestablish a TCP
172 * transport connection with the server. Some servers like to drop a TCP
173 * connection when they are overworked, so we start with a short timeout and
174 * increase over time if the server is down or not responding.
175 */
176#define XS_TCP_INIT_REEST_TO (3U * HZ)
177#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178
179/*
180 * TCP idle timeout; client drops the transport socket if it is idle
181 * for this long. Note that we also timeout UDP sockets to prevent
182 * holding port numbers when there is no RPC traffic.
183 */
184#define XS_IDLE_DISC_TO (5U * 60 * HZ)
185
186#ifdef RPC_DEBUG
187# undef RPC_DEBUG_DATA
188# define RPCDBG_FACILITY RPCDBG_TRANS
189#endif
190
191#ifdef RPC_DEBUG_DATA
192static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
193{
194 u8 *buf = (u8 *) packet;
195 int j;
196
197 dprintk("RPC: %s\n", msg);
198 for (j = 0; j < count && j < 128; j += 4) {
199 if (!(j & 31)) {
200 if (j)
201 dprintk("\n");
202 dprintk("0x%04x ", j);
203 }
204 dprintk("%02x%02x%02x%02x ",
205 buf[j], buf[j+1], buf[j+2], buf[j+3]);
206 }
207 dprintk("\n");
208}
209#else
210static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
211{
212 /* NOP */
213}
214#endif
215
216struct sock_xprt {
217 struct rpc_xprt xprt;
218
219 /*
220 * Network layer
221 */
222 struct socket * sock;
223 struct sock * inet;
224
225 /*
226 * State of TCP reply receive
227 */
228 __be32 tcp_fraghdr,
229 tcp_xid,
230 tcp_calldir;
231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
237
238 /*
239 * Connection of transports
240 */
241 struct delayed_work connect_worker;
242 struct sockaddr_storage srcaddr;
243 unsigned short srcport;
244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
257 void (*old_error_report)(struct sock *);
258};
259
260/*
261 * TCP receive state flags
262 */
263#define TCP_RCV_LAST_FRAG (1UL << 0)
264#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265#define TCP_RCV_COPY_XID (1UL << 2)
266#define TCP_RCV_COPY_DATA (1UL << 3)
267#define TCP_RCV_READ_CALLDIR (1UL << 4)
268#define TCP_RCV_COPY_CALLDIR (1UL << 5)
269
270/*
271 * TCP RPC flags
272 */
273#define TCP_RPC_REPLY (1UL << 6)
274
275static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
276{
277 return (struct sockaddr *) &xprt->addr;
278}
279
280static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
281{
282 return (struct sockaddr_un *) &xprt->addr;
283}
284
285static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
286{
287 return (struct sockaddr_in *) &xprt->addr;
288}
289
290static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
291{
292 return (struct sockaddr_in6 *) &xprt->addr;
293}
294
295static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
296{
297 struct sockaddr *sap = xs_addr(xprt);
298 struct sockaddr_in6 *sin6;
299 struct sockaddr_in *sin;
300 struct sockaddr_un *sun;
301 char buf[128];
302
303 switch (sap->sa_family) {
304 case AF_LOCAL:
305 sun = xs_addr_un(xprt);
306 strlcpy(buf, sun->sun_path, sizeof(buf));
307 xprt->address_strings[RPC_DISPLAY_ADDR] =
308 kstrdup(buf, GFP_KERNEL);
309 break;
310 case AF_INET:
311 (void)rpc_ntop(sap, buf, sizeof(buf));
312 xprt->address_strings[RPC_DISPLAY_ADDR] =
313 kstrdup(buf, GFP_KERNEL);
314 sin = xs_addr_in(xprt);
315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
316 break;
317 case AF_INET6:
318 (void)rpc_ntop(sap, buf, sizeof(buf));
319 xprt->address_strings[RPC_DISPLAY_ADDR] =
320 kstrdup(buf, GFP_KERNEL);
321 sin6 = xs_addr_in6(xprt);
322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
323 break;
324 default:
325 BUG();
326 }
327
328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
329}
330
331static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
332{
333 struct sockaddr *sap = xs_addr(xprt);
334 char buf[128];
335
336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
338
339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
341}
342
343static void xs_format_peer_addresses(struct rpc_xprt *xprt,
344 const char *protocol,
345 const char *netid)
346{
347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
348 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
349 xs_format_common_peer_addresses(xprt);
350 xs_format_common_peer_ports(xprt);
351}
352
353static void xs_update_peer_port(struct rpc_xprt *xprt)
354{
355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
357
358 xs_format_common_peer_ports(xprt);
359}
360
361static void xs_free_peer_addresses(struct rpc_xprt *xprt)
362{
363 unsigned int i;
364
365 for (i = 0; i < RPC_DISPLAY_MAX; i++)
366 switch (i) {
367 case RPC_DISPLAY_PROTO:
368 case RPC_DISPLAY_NETID:
369 continue;
370 default:
371 kfree(xprt->address_strings[i]);
372 }
373}
374
375#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
376
377static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
378{
379 struct msghdr msg = {
380 .msg_name = addr,
381 .msg_namelen = addrlen,
382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
383 };
384 struct kvec iov = {
385 .iov_base = vec->iov_base + base,
386 .iov_len = vec->iov_len - base,
387 };
388
389 if (iov.iov_len != 0)
390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
391 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
392}
393
394static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
395{
396 struct page **ppage;
397 unsigned int remainder;
398 int err, sent = 0;
399
400 remainder = xdr->page_len - base;
401 base += xdr->page_base;
402 ppage = xdr->pages + (base >> PAGE_SHIFT);
403 base &= ~PAGE_MASK;
404 for(;;) {
405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
406 int flags = XS_SENDMSG_FLAGS;
407
408 remainder -= len;
409 if (remainder != 0 || more)
410 flags |= MSG_MORE;
411 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
412 if (remainder == 0 || err != len)
413 break;
414 sent += err;
415 ppage++;
416 base = 0;
417 }
418 if (sent == 0)
419 return err;
420 if (err > 0)
421 sent += err;
422 return sent;
423}
424
425/**
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
432 *
433 */
434static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
435{
436 unsigned int remainder = xdr->len - base;
437 int err, sent = 0;
438
439 if (unlikely(!sock))
440 return -ENOTSOCK;
441
442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
443 if (base != 0) {
444 addr = NULL;
445 addrlen = 0;
446 }
447
448 if (base < xdr->head[0].iov_len || addr != NULL) {
449 unsigned int len = xdr->head[0].iov_len - base;
450 remainder -= len;
451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
452 if (remainder == 0 || err != len)
453 goto out;
454 sent += err;
455 base = 0;
456 } else
457 base -= xdr->head[0].iov_len;
458
459 if (base < xdr->page_len) {
460 unsigned int len = xdr->page_len - base;
461 remainder -= len;
462 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
463 if (remainder == 0 || err != len)
464 goto out;
465 sent += err;
466 base = 0;
467 } else
468 base -= xdr->page_len;
469
470 if (base >= xdr->tail[0].iov_len)
471 return sent;
472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
473out:
474 if (sent == 0)
475 return err;
476 if (err > 0)
477 sent += err;
478 return sent;
479}
480
481static void xs_nospace_callback(struct rpc_task *task)
482{
483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
484
485 transport->inet->sk_write_pending--;
486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
487}
488
489/**
490 * xs_nospace - place task on wait queue if transmit was incomplete
491 * @task: task to put to sleep
492 *
493 */
494static int xs_nospace(struct rpc_task *task)
495{
496 struct rpc_rqst *req = task->tk_rqstp;
497 struct rpc_xprt *xprt = req->rq_xprt;
498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
499 int ret = -EAGAIN;
500
501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
502 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
503 req->rq_slen);
504
505 /* Protect against races with write_space */
506 spin_lock_bh(&xprt->transport_lock);
507
508 /* Don't race with disconnect */
509 if (xprt_connected(xprt)) {
510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
511 /*
512 * Notify TCP that we're limited by the application
513 * window size
514 */
515 set_bit(SOCK_NOSPACE, &transport->sock->flags);
516 transport->inet->sk_write_pending++;
517 /* ...and wait for more buffer space */
518 xprt_wait_for_buffer_space(task, xs_nospace_callback);
519 }
520 } else {
521 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
522 ret = -ENOTCONN;
523 }
524
525 spin_unlock_bh(&xprt->transport_lock);
526 return ret;
527}
528
529/*
530 * Construct a stream transport record marker in @buf.
531 */
532static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
533{
534 u32 reclen = buf->len - sizeof(rpc_fraghdr);
535 rpc_fraghdr *base = buf->head[0].iov_base;
536 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
537}
538
539/**
540 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
541 * @task: RPC task that manages the state of an RPC request
542 *
543 * Return values:
544 * 0: The request has been sent
545 * EAGAIN: The socket was blocked, please call again later to
546 * complete the request
547 * ENOTCONN: Caller needs to invoke connect logic then call again
548 * other: Some other error occured, the request was not sent
549 */
550static int xs_local_send_request(struct rpc_task *task)
551{
552 struct rpc_rqst *req = task->tk_rqstp;
553 struct rpc_xprt *xprt = req->rq_xprt;
554 struct sock_xprt *transport =
555 container_of(xprt, struct sock_xprt, xprt);
556 struct xdr_buf *xdr = &req->rq_snd_buf;
557 int status;
558
559 xs_encode_stream_record_marker(&req->rq_snd_buf);
560
561 xs_pktdump("packet data:",
562 req->rq_svec->iov_base, req->rq_svec->iov_len);
563
564 status = xs_sendpages(transport->sock, NULL, 0,
565 xdr, req->rq_bytes_sent);
566 dprintk("RPC: %s(%u) = %d\n",
567 __func__, xdr->len - req->rq_bytes_sent, status);
568 if (likely(status >= 0)) {
569 req->rq_bytes_sent += status;
570 req->rq_xmit_bytes_sent += status;
571 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
572 req->rq_bytes_sent = 0;
573 return 0;
574 }
575 status = -EAGAIN;
576 }
577
578 switch (status) {
579 case -EAGAIN:
580 status = xs_nospace(task);
581 break;
582 default:
583 dprintk("RPC: sendmsg returned unrecognized error %d\n",
584 -status);
585 case -EPIPE:
586 xs_close(xprt);
587 status = -ENOTCONN;
588 }
589
590 return status;
591}
592
593/**
594 * xs_udp_send_request - write an RPC request to a UDP socket
595 * @task: address of RPC task that manages the state of an RPC request
596 *
597 * Return values:
598 * 0: The request has been sent
599 * EAGAIN: The socket was blocked, please call again later to
600 * complete the request
601 * ENOTCONN: Caller needs to invoke connect logic then call again
602 * other: Some other error occurred, the request was not sent
603 */
604static int xs_udp_send_request(struct rpc_task *task)
605{
606 struct rpc_rqst *req = task->tk_rqstp;
607 struct rpc_xprt *xprt = req->rq_xprt;
608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
609 struct xdr_buf *xdr = &req->rq_snd_buf;
610 int status;
611
612 xs_pktdump("packet data:",
613 req->rq_svec->iov_base,
614 req->rq_svec->iov_len);
615
616 if (!xprt_bound(xprt))
617 return -ENOTCONN;
618 status = xs_sendpages(transport->sock,
619 xs_addr(xprt),
620 xprt->addrlen, xdr,
621 req->rq_bytes_sent);
622
623 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
624 xdr->len - req->rq_bytes_sent, status);
625
626 if (status >= 0) {
627 req->rq_xmit_bytes_sent += status;
628 if (status >= req->rq_slen)
629 return 0;
630 /* Still some bytes left; set up for a retry later. */
631 status = -EAGAIN;
632 }
633
634 switch (status) {
635 case -ENOTSOCK:
636 status = -ENOTCONN;
637 /* Should we call xs_close() here? */
638 break;
639 case -EAGAIN:
640 status = xs_nospace(task);
641 break;
642 default:
643 dprintk("RPC: sendmsg returned unrecognized error %d\n",
644 -status);
645 case -ENETUNREACH:
646 case -EPIPE:
647 case -ECONNREFUSED:
648 /* When the server has died, an ICMP port unreachable message
649 * prompts ECONNREFUSED. */
650 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
651 }
652
653 return status;
654}
655
656/**
657 * xs_tcp_shutdown - gracefully shut down a TCP socket
658 * @xprt: transport
659 *
660 * Initiates a graceful shutdown of the TCP socket by calling the
661 * equivalent of shutdown(SHUT_WR);
662 */
663static void xs_tcp_shutdown(struct rpc_xprt *xprt)
664{
665 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
666 struct socket *sock = transport->sock;
667
668 if (sock != NULL)
669 kernel_sock_shutdown(sock, SHUT_WR);
670}
671
672/**
673 * xs_tcp_send_request - write an RPC request to a TCP socket
674 * @task: address of RPC task that manages the state of an RPC request
675 *
676 * Return values:
677 * 0: The request has been sent
678 * EAGAIN: The socket was blocked, please call again later to
679 * complete the request
680 * ENOTCONN: Caller needs to invoke connect logic then call again
681 * other: Some other error occurred, the request was not sent
682 *
683 * XXX: In the case of soft timeouts, should we eventually give up
684 * if sendmsg is not able to make progress?
685 */
686static int xs_tcp_send_request(struct rpc_task *task)
687{
688 struct rpc_rqst *req = task->tk_rqstp;
689 struct rpc_xprt *xprt = req->rq_xprt;
690 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
691 struct xdr_buf *xdr = &req->rq_snd_buf;
692 int status;
693
694 xs_encode_stream_record_marker(&req->rq_snd_buf);
695
696 xs_pktdump("packet data:",
697 req->rq_svec->iov_base,
698 req->rq_svec->iov_len);
699
700 /* Continue transmitting the packet/record. We must be careful
701 * to cope with writespace callbacks arriving _after_ we have
702 * called sendmsg(). */
703 while (1) {
704 status = xs_sendpages(transport->sock,
705 NULL, 0, xdr, req->rq_bytes_sent);
706
707 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
708 xdr->len - req->rq_bytes_sent, status);
709
710 if (unlikely(status < 0))
711 break;
712
713 /* If we've sent the entire packet, immediately
714 * reset the count of bytes sent. */
715 req->rq_bytes_sent += status;
716 req->rq_xmit_bytes_sent += status;
717 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
718 req->rq_bytes_sent = 0;
719 return 0;
720 }
721
722 if (status != 0)
723 continue;
724 status = -EAGAIN;
725 break;
726 }
727
728 switch (status) {
729 case -ENOTSOCK:
730 status = -ENOTCONN;
731 /* Should we call xs_close() here? */
732 break;
733 case -EAGAIN:
734 status = xs_nospace(task);
735 break;
736 default:
737 dprintk("RPC: sendmsg returned unrecognized error %d\n",
738 -status);
739 case -ECONNRESET:
740 case -EPIPE:
741 xs_tcp_shutdown(xprt);
742 case -ECONNREFUSED:
743 case -ENOTCONN:
744 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
745 }
746
747 return status;
748}
749
750/**
751 * xs_tcp_release_xprt - clean up after a tcp transmission
752 * @xprt: transport
753 * @task: rpc task
754 *
755 * This cleans up if an error causes us to abort the transmission of a request.
756 * In this case, the socket may need to be reset in order to avoid confusing
757 * the server.
758 */
759static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
760{
761 struct rpc_rqst *req;
762
763 if (task != xprt->snd_task)
764 return;
765 if (task == NULL)
766 goto out_release;
767 req = task->tk_rqstp;
768 if (req == NULL)
769 goto out_release;
770 if (req->rq_bytes_sent == 0)
771 goto out_release;
772 if (req->rq_bytes_sent == req->rq_snd_buf.len)
773 goto out_release;
774 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
775out_release:
776 xprt_release_xprt(xprt, task);
777}
778
779static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
780{
781 transport->old_data_ready = sk->sk_data_ready;
782 transport->old_state_change = sk->sk_state_change;
783 transport->old_write_space = sk->sk_write_space;
784 transport->old_error_report = sk->sk_error_report;
785}
786
787static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
788{
789 sk->sk_data_ready = transport->old_data_ready;
790 sk->sk_state_change = transport->old_state_change;
791 sk->sk_write_space = transport->old_write_space;
792 sk->sk_error_report = transport->old_error_report;
793}
794
795static void xs_reset_transport(struct sock_xprt *transport)
796{
797 struct socket *sock = transport->sock;
798 struct sock *sk = transport->inet;
799
800 if (sk == NULL)
801 return;
802
803 transport->srcport = 0;
804
805 write_lock_bh(&sk->sk_callback_lock);
806 transport->inet = NULL;
807 transport->sock = NULL;
808
809 sk->sk_user_data = NULL;
810
811 xs_restore_old_callbacks(transport, sk);
812 write_unlock_bh(&sk->sk_callback_lock);
813
814 sk->sk_no_check = 0;
815
816 sock_release(sock);
817}
818
819/**
820 * xs_close - close a socket
821 * @xprt: transport
822 *
823 * This is used when all requests are complete; ie, no DRC state remains
824 * on the server we want to save.
825 *
826 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
827 * xs_reset_transport() zeroing the socket from underneath a writer.
828 */
829static void xs_close(struct rpc_xprt *xprt)
830{
831 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
832
833 dprintk("RPC: xs_close xprt %p\n", xprt);
834
835 xs_reset_transport(transport);
836 xprt->reestablish_timeout = 0;
837
838 smp_mb__before_clear_bit();
839 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
840 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
841 clear_bit(XPRT_CLOSING, &xprt->state);
842 smp_mb__after_clear_bit();
843 xprt_disconnect_done(xprt);
844}
845
846static void xs_tcp_close(struct rpc_xprt *xprt)
847{
848 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
849 xs_close(xprt);
850 else
851 xs_tcp_shutdown(xprt);
852}
853
854/**
855 * xs_destroy - prepare to shutdown a transport
856 * @xprt: doomed transport
857 *
858 */
859static void xs_destroy(struct rpc_xprt *xprt)
860{
861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
862
863 dprintk("RPC: xs_destroy xprt %p\n", xprt);
864
865 cancel_delayed_work_sync(&transport->connect_worker);
866
867 xs_close(xprt);
868 xs_free_peer_addresses(xprt);
869 xprt_free(xprt);
870 module_put(THIS_MODULE);
871}
872
873static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
874{
875 return (struct rpc_xprt *) sk->sk_user_data;
876}
877
878static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
879{
880 struct xdr_skb_reader desc = {
881 .skb = skb,
882 .offset = sizeof(rpc_fraghdr),
883 .count = skb->len - sizeof(rpc_fraghdr),
884 };
885
886 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
887 return -1;
888 if (desc.count)
889 return -1;
890 return 0;
891}
892
893/**
894 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
895 * @sk: socket with data to read
896 * @len: how much data to read
897 *
898 * Currently this assumes we can read the whole reply in a single gulp.
899 */
900static void xs_local_data_ready(struct sock *sk, int len)
901{
902 struct rpc_task *task;
903 struct rpc_xprt *xprt;
904 struct rpc_rqst *rovr;
905 struct sk_buff *skb;
906 int err, repsize, copied;
907 u32 _xid;
908 __be32 *xp;
909
910 read_lock_bh(&sk->sk_callback_lock);
911 dprintk("RPC: %s...\n", __func__);
912 xprt = xprt_from_sock(sk);
913 if (xprt == NULL)
914 goto out;
915
916 skb = skb_recv_datagram(sk, 0, 1, &err);
917 if (skb == NULL)
918 goto out;
919
920 if (xprt->shutdown)
921 goto dropit;
922
923 repsize = skb->len - sizeof(rpc_fraghdr);
924 if (repsize < 4) {
925 dprintk("RPC: impossible RPC reply size %d\n", repsize);
926 goto dropit;
927 }
928
929 /* Copy the XID from the skb... */
930 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
931 if (xp == NULL)
932 goto dropit;
933
934 /* Look up and lock the request corresponding to the given XID */
935 spin_lock(&xprt->transport_lock);
936 rovr = xprt_lookup_rqst(xprt, *xp);
937 if (!rovr)
938 goto out_unlock;
939 task = rovr->rq_task;
940
941 copied = rovr->rq_private_buf.buflen;
942 if (copied > repsize)
943 copied = repsize;
944
945 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
946 dprintk("RPC: sk_buff copy failed\n");
947 goto out_unlock;
948 }
949
950 xprt_complete_rqst(task, copied);
951
952 out_unlock:
953 spin_unlock(&xprt->transport_lock);
954 dropit:
955 skb_free_datagram(sk, skb);
956 out:
957 read_unlock_bh(&sk->sk_callback_lock);
958}
959
960/**
961 * xs_udp_data_ready - "data ready" callback for UDP sockets
962 * @sk: socket with data to read
963 * @len: how much data to read
964 *
965 */
966static void xs_udp_data_ready(struct sock *sk, int len)
967{
968 struct rpc_task *task;
969 struct rpc_xprt *xprt;
970 struct rpc_rqst *rovr;
971 struct sk_buff *skb;
972 int err, repsize, copied;
973 u32 _xid;
974 __be32 *xp;
975
976 read_lock_bh(&sk->sk_callback_lock);
977 dprintk("RPC: xs_udp_data_ready...\n");
978 if (!(xprt = xprt_from_sock(sk)))
979 goto out;
980
981 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
982 goto out;
983
984 if (xprt->shutdown)
985 goto dropit;
986
987 repsize = skb->len - sizeof(struct udphdr);
988 if (repsize < 4) {
989 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
990 goto dropit;
991 }
992
993 /* Copy the XID from the skb... */
994 xp = skb_header_pointer(skb, sizeof(struct udphdr),
995 sizeof(_xid), &_xid);
996 if (xp == NULL)
997 goto dropit;
998
999 /* Look up and lock the request corresponding to the given XID */
1000 spin_lock(&xprt->transport_lock);
1001 rovr = xprt_lookup_rqst(xprt, *xp);
1002 if (!rovr)
1003 goto out_unlock;
1004 task = rovr->rq_task;
1005
1006 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1007 copied = repsize;
1008
1009 /* Suck it into the iovec, verify checksum if not done by hw. */
1010 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1011 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1012 goto out_unlock;
1013 }
1014
1015 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1016
1017 /* Something worked... */
1018 dst_confirm(skb_dst(skb));
1019
1020 xprt_adjust_cwnd(task, copied);
1021 xprt_complete_rqst(task, copied);
1022
1023 out_unlock:
1024 spin_unlock(&xprt->transport_lock);
1025 dropit:
1026 skb_free_datagram(sk, skb);
1027 out:
1028 read_unlock_bh(&sk->sk_callback_lock);
1029}
1030
1031static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1032{
1033 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1034 size_t len, used;
1035 char *p;
1036
1037 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1038 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1039 used = xdr_skb_read_bits(desc, p, len);
1040 transport->tcp_offset += used;
1041 if (used != len)
1042 return;
1043
1044 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1045 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1046 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1047 else
1048 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1049 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1050
1051 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1052 transport->tcp_offset = 0;
1053
1054 /* Sanity check of the record length */
1055 if (unlikely(transport->tcp_reclen < 8)) {
1056 dprintk("RPC: invalid TCP record fragment length\n");
1057 xprt_force_disconnect(xprt);
1058 return;
1059 }
1060 dprintk("RPC: reading TCP record fragment of length %d\n",
1061 transport->tcp_reclen);
1062}
1063
1064static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1065{
1066 if (transport->tcp_offset == transport->tcp_reclen) {
1067 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1068 transport->tcp_offset = 0;
1069 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1070 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1071 transport->tcp_flags |= TCP_RCV_COPY_XID;
1072 transport->tcp_copied = 0;
1073 }
1074 }
1075}
1076
1077static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1078{
1079 size_t len, used;
1080 char *p;
1081
1082 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1083 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1084 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1085 used = xdr_skb_read_bits(desc, p, len);
1086 transport->tcp_offset += used;
1087 if (used != len)
1088 return;
1089 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1090 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1091 transport->tcp_copied = 4;
1092 dprintk("RPC: reading %s XID %08x\n",
1093 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1094 : "request with",
1095 ntohl(transport->tcp_xid));
1096 xs_tcp_check_fraghdr(transport);
1097}
1098
1099static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1100 struct xdr_skb_reader *desc)
1101{
1102 size_t len, used;
1103 u32 offset;
1104 char *p;
1105
1106 /*
1107 * We want transport->tcp_offset to be 8 at the end of this routine
1108 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1109 * When this function is called for the first time,
1110 * transport->tcp_offset is 4 (after having already read the xid).
1111 */
1112 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1113 len = sizeof(transport->tcp_calldir) - offset;
1114 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1115 p = ((char *) &transport->tcp_calldir) + offset;
1116 used = xdr_skb_read_bits(desc, p, len);
1117 transport->tcp_offset += used;
1118 if (used != len)
1119 return;
1120 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1121 /*
1122 * We don't yet have the XDR buffer, so we will write the calldir
1123 * out after we get the buffer from the 'struct rpc_rqst'
1124 */
1125 switch (ntohl(transport->tcp_calldir)) {
1126 case RPC_REPLY:
1127 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1128 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1129 transport->tcp_flags |= TCP_RPC_REPLY;
1130 break;
1131 case RPC_CALL:
1132 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1133 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1134 transport->tcp_flags &= ~TCP_RPC_REPLY;
1135 break;
1136 default:
1137 dprintk("RPC: invalid request message type\n");
1138 xprt_force_disconnect(&transport->xprt);
1139 }
1140 xs_tcp_check_fraghdr(transport);
1141}
1142
1143static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1144 struct xdr_skb_reader *desc,
1145 struct rpc_rqst *req)
1146{
1147 struct sock_xprt *transport =
1148 container_of(xprt, struct sock_xprt, xprt);
1149 struct xdr_buf *rcvbuf;
1150 size_t len;
1151 ssize_t r;
1152
1153 rcvbuf = &req->rq_private_buf;
1154
1155 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1156 /*
1157 * Save the RPC direction in the XDR buffer
1158 */
1159 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1160 &transport->tcp_calldir,
1161 sizeof(transport->tcp_calldir));
1162 transport->tcp_copied += sizeof(transport->tcp_calldir);
1163 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1164 }
1165
1166 len = desc->count;
1167 if (len > transport->tcp_reclen - transport->tcp_offset) {
1168 struct xdr_skb_reader my_desc;
1169
1170 len = transport->tcp_reclen - transport->tcp_offset;
1171 memcpy(&my_desc, desc, sizeof(my_desc));
1172 my_desc.count = len;
1173 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1174 &my_desc, xdr_skb_read_bits);
1175 desc->count -= r;
1176 desc->offset += r;
1177 } else
1178 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1179 desc, xdr_skb_read_bits);
1180
1181 if (r > 0) {
1182 transport->tcp_copied += r;
1183 transport->tcp_offset += r;
1184 }
1185 if (r != len) {
1186 /* Error when copying to the receive buffer,
1187 * usually because we weren't able to allocate
1188 * additional buffer pages. All we can do now
1189 * is turn off TCP_RCV_COPY_DATA, so the request
1190 * will not receive any additional updates,
1191 * and time out.
1192 * Any remaining data from this record will
1193 * be discarded.
1194 */
1195 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1196 dprintk("RPC: XID %08x truncated request\n",
1197 ntohl(transport->tcp_xid));
1198 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1199 "tcp_offset = %u, tcp_reclen = %u\n",
1200 xprt, transport->tcp_copied,
1201 transport->tcp_offset, transport->tcp_reclen);
1202 return;
1203 }
1204
1205 dprintk("RPC: XID %08x read %Zd bytes\n",
1206 ntohl(transport->tcp_xid), r);
1207 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1208 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1209 transport->tcp_offset, transport->tcp_reclen);
1210
1211 if (transport->tcp_copied == req->rq_private_buf.buflen)
1212 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1213 else if (transport->tcp_offset == transport->tcp_reclen) {
1214 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1215 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1216 }
1217}
1218
1219/*
1220 * Finds the request corresponding to the RPC xid and invokes the common
1221 * tcp read code to read the data.
1222 */
1223static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1224 struct xdr_skb_reader *desc)
1225{
1226 struct sock_xprt *transport =
1227 container_of(xprt, struct sock_xprt, xprt);
1228 struct rpc_rqst *req;
1229
1230 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1231
1232 /* Find and lock the request corresponding to this xid */
1233 spin_lock(&xprt->transport_lock);
1234 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1235 if (!req) {
1236 dprintk("RPC: XID %08x request not found!\n",
1237 ntohl(transport->tcp_xid));
1238 spin_unlock(&xprt->transport_lock);
1239 return -1;
1240 }
1241
1242 xs_tcp_read_common(xprt, desc, req);
1243
1244 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1245 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1246
1247 spin_unlock(&xprt->transport_lock);
1248 return 0;
1249}
1250
1251#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1252/*
1253 * Obtains an rpc_rqst previously allocated and invokes the common
1254 * tcp read code to read the data. The result is placed in the callback
1255 * queue.
1256 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1257 * connection and return -1.
1258 */
1259static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1260 struct xdr_skb_reader *desc)
1261{
1262 struct sock_xprt *transport =
1263 container_of(xprt, struct sock_xprt, xprt);
1264 struct rpc_rqst *req;
1265
1266 req = xprt_alloc_bc_request(xprt);
1267 if (req == NULL) {
1268 printk(KERN_WARNING "Callback slot table overflowed\n");
1269 xprt_force_disconnect(xprt);
1270 return -1;
1271 }
1272
1273 req->rq_xid = transport->tcp_xid;
1274 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1275 xs_tcp_read_common(xprt, desc, req);
1276
1277 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1278 struct svc_serv *bc_serv = xprt->bc_serv;
1279
1280 /*
1281 * Add callback request to callback list. The callback
1282 * service sleeps on the sv_cb_waitq waiting for new
1283 * requests. Wake it up after adding enqueing the
1284 * request.
1285 */
1286 dprintk("RPC: add callback request to list\n");
1287 spin_lock(&bc_serv->sv_cb_lock);
1288 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1289 spin_unlock(&bc_serv->sv_cb_lock);
1290 wake_up(&bc_serv->sv_cb_waitq);
1291 }
1292
1293 req->rq_private_buf.len = transport->tcp_copied;
1294
1295 return 0;
1296}
1297
1298static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1299 struct xdr_skb_reader *desc)
1300{
1301 struct sock_xprt *transport =
1302 container_of(xprt, struct sock_xprt, xprt);
1303
1304 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1305 xs_tcp_read_reply(xprt, desc) :
1306 xs_tcp_read_callback(xprt, desc);
1307}
1308#else
1309static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1310 struct xdr_skb_reader *desc)
1311{
1312 return xs_tcp_read_reply(xprt, desc);
1313}
1314#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1315
1316/*
1317 * Read data off the transport. This can be either an RPC_CALL or an
1318 * RPC_REPLY. Relay the processing to helper functions.
1319 */
1320static void xs_tcp_read_data(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
1326 if (_xs_tcp_read_data(xprt, desc) == 0)
1327 xs_tcp_check_fraghdr(transport);
1328 else {
1329 /*
1330 * The transport_lock protects the request handling.
1331 * There's no need to hold it to update the tcp_flags.
1332 */
1333 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1334 }
1335}
1336
1337static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1338{
1339 size_t len;
1340
1341 len = transport->tcp_reclen - transport->tcp_offset;
1342 if (len > desc->count)
1343 len = desc->count;
1344 desc->count -= len;
1345 desc->offset += len;
1346 transport->tcp_offset += len;
1347 dprintk("RPC: discarded %Zu bytes\n", len);
1348 xs_tcp_check_fraghdr(transport);
1349}
1350
1351static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1352{
1353 struct rpc_xprt *xprt = rd_desc->arg.data;
1354 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1355 struct xdr_skb_reader desc = {
1356 .skb = skb,
1357 .offset = offset,
1358 .count = len,
1359 };
1360
1361 dprintk("RPC: xs_tcp_data_recv started\n");
1362 do {
1363 /* Read in a new fragment marker if necessary */
1364 /* Can we ever really expect to get completely empty fragments? */
1365 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1366 xs_tcp_read_fraghdr(xprt, &desc);
1367 continue;
1368 }
1369 /* Read in the xid if necessary */
1370 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1371 xs_tcp_read_xid(transport, &desc);
1372 continue;
1373 }
1374 /* Read in the call/reply flag */
1375 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1376 xs_tcp_read_calldir(transport, &desc);
1377 continue;
1378 }
1379 /* Read in the request data */
1380 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1381 xs_tcp_read_data(xprt, &desc);
1382 continue;
1383 }
1384 /* Skip over any trailing bytes on short reads */
1385 xs_tcp_read_discard(transport, &desc);
1386 } while (desc.count);
1387 dprintk("RPC: xs_tcp_data_recv done\n");
1388 return len - desc.count;
1389}
1390
1391/**
1392 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1393 * @sk: socket with data to read
1394 * @bytes: how much data to read
1395 *
1396 */
1397static void xs_tcp_data_ready(struct sock *sk, int bytes)
1398{
1399 struct rpc_xprt *xprt;
1400 read_descriptor_t rd_desc;
1401 int read;
1402
1403 dprintk("RPC: xs_tcp_data_ready...\n");
1404
1405 read_lock_bh(&sk->sk_callback_lock);
1406 if (!(xprt = xprt_from_sock(sk)))
1407 goto out;
1408 if (xprt->shutdown)
1409 goto out;
1410
1411 /* Any data means we had a useful conversation, so
1412 * the we don't need to delay the next reconnect
1413 */
1414 if (xprt->reestablish_timeout)
1415 xprt->reestablish_timeout = 0;
1416
1417 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1418 rd_desc.arg.data = xprt;
1419 do {
1420 rd_desc.count = 65536;
1421 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1422 } while (read > 0);
1423out:
1424 read_unlock_bh(&sk->sk_callback_lock);
1425}
1426
1427/*
1428 * Do the equivalent of linger/linger2 handling for dealing with
1429 * broken servers that don't close the socket in a timely
1430 * fashion
1431 */
1432static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1433 unsigned long timeout)
1434{
1435 struct sock_xprt *transport;
1436
1437 if (xprt_test_and_set_connecting(xprt))
1438 return;
1439 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1440 transport = container_of(xprt, struct sock_xprt, xprt);
1441 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1442 timeout);
1443}
1444
1445static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1446{
1447 struct sock_xprt *transport;
1448
1449 transport = container_of(xprt, struct sock_xprt, xprt);
1450
1451 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1452 !cancel_delayed_work(&transport->connect_worker))
1453 return;
1454 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1455 xprt_clear_connecting(xprt);
1456}
1457
1458static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1459{
1460 smp_mb__before_clear_bit();
1461 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1462 clear_bit(XPRT_CLOSING, &xprt->state);
1463 smp_mb__after_clear_bit();
1464 /* Mark transport as closed and wake up all pending tasks */
1465 xprt_disconnect_done(xprt);
1466}
1467
1468/**
1469 * xs_tcp_state_change - callback to handle TCP socket state changes
1470 * @sk: socket whose state has changed
1471 *
1472 */
1473static void xs_tcp_state_change(struct sock *sk)
1474{
1475 struct rpc_xprt *xprt;
1476
1477 read_lock_bh(&sk->sk_callback_lock);
1478 if (!(xprt = xprt_from_sock(sk)))
1479 goto out;
1480 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1481 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1482 sk->sk_state, xprt_connected(xprt),
1483 sock_flag(sk, SOCK_DEAD),
1484 sock_flag(sk, SOCK_ZAPPED),
1485 sk->sk_shutdown);
1486
1487 switch (sk->sk_state) {
1488 case TCP_ESTABLISHED:
1489 spin_lock(&xprt->transport_lock);
1490 if (!xprt_test_and_set_connected(xprt)) {
1491 struct sock_xprt *transport = container_of(xprt,
1492 struct sock_xprt, xprt);
1493
1494 /* Reset TCP record info */
1495 transport->tcp_offset = 0;
1496 transport->tcp_reclen = 0;
1497 transport->tcp_copied = 0;
1498 transport->tcp_flags =
1499 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1500
1501 xprt_wake_pending_tasks(xprt, -EAGAIN);
1502 }
1503 spin_unlock(&xprt->transport_lock);
1504 break;
1505 case TCP_FIN_WAIT1:
1506 /* The client initiated a shutdown of the socket */
1507 xprt->connect_cookie++;
1508 xprt->reestablish_timeout = 0;
1509 set_bit(XPRT_CLOSING, &xprt->state);
1510 smp_mb__before_clear_bit();
1511 clear_bit(XPRT_CONNECTED, &xprt->state);
1512 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1513 smp_mb__after_clear_bit();
1514 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1515 break;
1516 case TCP_CLOSE_WAIT:
1517 /* The server initiated a shutdown of the socket */
1518 xprt_force_disconnect(xprt);
1519 xprt->connect_cookie++;
1520 case TCP_CLOSING:
1521 /*
1522 * If the server closed down the connection, make sure that
1523 * we back off before reconnecting
1524 */
1525 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1526 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1527 break;
1528 case TCP_LAST_ACK:
1529 set_bit(XPRT_CLOSING, &xprt->state);
1530 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1531 smp_mb__before_clear_bit();
1532 clear_bit(XPRT_CONNECTED, &xprt->state);
1533 smp_mb__after_clear_bit();
1534 break;
1535 case TCP_CLOSE:
1536 xs_tcp_cancel_linger_timeout(xprt);
1537 xs_sock_mark_closed(xprt);
1538 }
1539 out:
1540 read_unlock_bh(&sk->sk_callback_lock);
1541}
1542
1543/**
1544 * xs_error_report - callback mainly for catching socket errors
1545 * @sk: socket
1546 */
1547static void xs_error_report(struct sock *sk)
1548{
1549 struct rpc_xprt *xprt;
1550
1551 read_lock_bh(&sk->sk_callback_lock);
1552 if (!(xprt = xprt_from_sock(sk)))
1553 goto out;
1554 dprintk("RPC: %s client %p...\n"
1555 "RPC: error %d\n",
1556 __func__, xprt, sk->sk_err);
1557 xprt_wake_pending_tasks(xprt, -EAGAIN);
1558out:
1559 read_unlock_bh(&sk->sk_callback_lock);
1560}
1561
1562static void xs_write_space(struct sock *sk)
1563{
1564 struct socket *sock;
1565 struct rpc_xprt *xprt;
1566
1567 if (unlikely(!(sock = sk->sk_socket)))
1568 return;
1569 clear_bit(SOCK_NOSPACE, &sock->flags);
1570
1571 if (unlikely(!(xprt = xprt_from_sock(sk))))
1572 return;
1573 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1574 return;
1575
1576 xprt_write_space(xprt);
1577}
1578
1579/**
1580 * xs_udp_write_space - callback invoked when socket buffer space
1581 * becomes available
1582 * @sk: socket whose state has changed
1583 *
1584 * Called when more output buffer space is available for this socket.
1585 * We try not to wake our writers until they can make "significant"
1586 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1587 * with a bunch of small requests.
1588 */
1589static void xs_udp_write_space(struct sock *sk)
1590{
1591 read_lock_bh(&sk->sk_callback_lock);
1592
1593 /* from net/core/sock.c:sock_def_write_space */
1594 if (sock_writeable(sk))
1595 xs_write_space(sk);
1596
1597 read_unlock_bh(&sk->sk_callback_lock);
1598}
1599
1600/**
1601 * xs_tcp_write_space - callback invoked when socket buffer space
1602 * becomes available
1603 * @sk: socket whose state has changed
1604 *
1605 * Called when more output buffer space is available for this socket.
1606 * We try not to wake our writers until they can make "significant"
1607 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1608 * with a bunch of small requests.
1609 */
1610static void xs_tcp_write_space(struct sock *sk)
1611{
1612 read_lock_bh(&sk->sk_callback_lock);
1613
1614 /* from net/core/stream.c:sk_stream_write_space */
1615 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1616 xs_write_space(sk);
1617
1618 read_unlock_bh(&sk->sk_callback_lock);
1619}
1620
1621static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1622{
1623 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1624 struct sock *sk = transport->inet;
1625
1626 if (transport->rcvsize) {
1627 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1628 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1629 }
1630 if (transport->sndsize) {
1631 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1632 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1633 sk->sk_write_space(sk);
1634 }
1635}
1636
1637/**
1638 * xs_udp_set_buffer_size - set send and receive limits
1639 * @xprt: generic transport
1640 * @sndsize: requested size of send buffer, in bytes
1641 * @rcvsize: requested size of receive buffer, in bytes
1642 *
1643 * Set socket send and receive buffer size limits.
1644 */
1645static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1646{
1647 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1648
1649 transport->sndsize = 0;
1650 if (sndsize)
1651 transport->sndsize = sndsize + 1024;
1652 transport->rcvsize = 0;
1653 if (rcvsize)
1654 transport->rcvsize = rcvsize + 1024;
1655
1656 xs_udp_do_set_buffer_size(xprt);
1657}
1658
1659/**
1660 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1661 * @task: task that timed out
1662 *
1663 * Adjust the congestion window after a retransmit timeout has occurred.
1664 */
1665static void xs_udp_timer(struct rpc_task *task)
1666{
1667 xprt_adjust_cwnd(task, -ETIMEDOUT);
1668}
1669
1670static unsigned short xs_get_random_port(void)
1671{
1672 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1673 unsigned short rand = (unsigned short) net_random() % range;
1674 return rand + xprt_min_resvport;
1675}
1676
1677/**
1678 * xs_set_port - reset the port number in the remote endpoint address
1679 * @xprt: generic transport
1680 * @port: new port number
1681 *
1682 */
1683static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1684{
1685 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1686
1687 rpc_set_port(xs_addr(xprt), port);
1688 xs_update_peer_port(xprt);
1689}
1690
1691static unsigned short xs_get_srcport(struct sock_xprt *transport)
1692{
1693 unsigned short port = transport->srcport;
1694
1695 if (port == 0 && transport->xprt.resvport)
1696 port = xs_get_random_port();
1697 return port;
1698}
1699
1700static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1701{
1702 if (transport->srcport != 0)
1703 transport->srcport = 0;
1704 if (!transport->xprt.resvport)
1705 return 0;
1706 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1707 return xprt_max_resvport;
1708 return --port;
1709}
1710static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1711{
1712 struct sockaddr_storage myaddr;
1713 int err, nloop = 0;
1714 unsigned short port = xs_get_srcport(transport);
1715 unsigned short last;
1716
1717 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1718 do {
1719 rpc_set_port((struct sockaddr *)&myaddr, port);
1720 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1721 transport->xprt.addrlen);
1722 if (port == 0)
1723 break;
1724 if (err == 0) {
1725 transport->srcport = port;
1726 break;
1727 }
1728 last = port;
1729 port = xs_next_srcport(transport, port);
1730 if (port > last)
1731 nloop++;
1732 } while (err == -EADDRINUSE && nloop != 2);
1733
1734 if (myaddr.ss_family == AF_INET)
1735 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1736 &((struct sockaddr_in *)&myaddr)->sin_addr,
1737 port, err ? "failed" : "ok", err);
1738 else
1739 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1740 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1741 port, err ? "failed" : "ok", err);
1742 return err;
1743}
1744
1745/*
1746 * We don't support autobind on AF_LOCAL sockets
1747 */
1748static void xs_local_rpcbind(struct rpc_task *task)
1749{
1750 xprt_set_bound(task->tk_xprt);
1751}
1752
1753static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1754{
1755}
1756
1757#ifdef CONFIG_DEBUG_LOCK_ALLOC
1758static struct lock_class_key xs_key[2];
1759static struct lock_class_key xs_slock_key[2];
1760
1761static inline void xs_reclassify_socketu(struct socket *sock)
1762{
1763 struct sock *sk = sock->sk;
1764
1765 BUG_ON(sock_owned_by_user(sk));
1766 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1767 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1768}
1769
1770static inline void xs_reclassify_socket4(struct socket *sock)
1771{
1772 struct sock *sk = sock->sk;
1773
1774 BUG_ON(sock_owned_by_user(sk));
1775 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1776 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1777}
1778
1779static inline void xs_reclassify_socket6(struct socket *sock)
1780{
1781 struct sock *sk = sock->sk;
1782
1783 BUG_ON(sock_owned_by_user(sk));
1784 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1785 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1786}
1787
1788static inline void xs_reclassify_socket(int family, struct socket *sock)
1789{
1790 switch (family) {
1791 case AF_LOCAL:
1792 xs_reclassify_socketu(sock);
1793 break;
1794 case AF_INET:
1795 xs_reclassify_socket4(sock);
1796 break;
1797 case AF_INET6:
1798 xs_reclassify_socket6(sock);
1799 break;
1800 }
1801}
1802#else
1803static inline void xs_reclassify_socketu(struct socket *sock)
1804{
1805}
1806
1807static inline void xs_reclassify_socket4(struct socket *sock)
1808{
1809}
1810
1811static inline void xs_reclassify_socket6(struct socket *sock)
1812{
1813}
1814
1815static inline void xs_reclassify_socket(int family, struct socket *sock)
1816{
1817}
1818#endif
1819
1820static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1821 struct sock_xprt *transport, int family, int type, int protocol)
1822{
1823 struct socket *sock;
1824 int err;
1825
1826 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1827 if (err < 0) {
1828 dprintk("RPC: can't create %d transport socket (%d).\n",
1829 protocol, -err);
1830 goto out;
1831 }
1832 xs_reclassify_socket(family, sock);
1833
1834 err = xs_bind(transport, sock);
1835 if (err) {
1836 sock_release(sock);
1837 goto out;
1838 }
1839
1840 return sock;
1841out:
1842 return ERR_PTR(err);
1843}
1844
1845static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1846 struct socket *sock)
1847{
1848 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1849 xprt);
1850
1851 if (!transport->inet) {
1852 struct sock *sk = sock->sk;
1853
1854 write_lock_bh(&sk->sk_callback_lock);
1855
1856 xs_save_old_callbacks(transport, sk);
1857
1858 sk->sk_user_data = xprt;
1859 sk->sk_data_ready = xs_local_data_ready;
1860 sk->sk_write_space = xs_udp_write_space;
1861 sk->sk_error_report = xs_error_report;
1862 sk->sk_allocation = GFP_ATOMIC;
1863
1864 xprt_clear_connected(xprt);
1865
1866 /* Reset to new socket */
1867 transport->sock = sock;
1868 transport->inet = sk;
1869
1870 write_unlock_bh(&sk->sk_callback_lock);
1871 }
1872
1873 /* Tell the socket layer to start connecting... */
1874 xprt->stat.connect_count++;
1875 xprt->stat.connect_start = jiffies;
1876 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1877}
1878
1879/**
1880 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1881 * @xprt: RPC transport to connect
1882 * @transport: socket transport to connect
1883 * @create_sock: function to create a socket of the correct type
1884 *
1885 * Invoked by a work queue tasklet.
1886 */
1887static void xs_local_setup_socket(struct work_struct *work)
1888{
1889 struct sock_xprt *transport =
1890 container_of(work, struct sock_xprt, connect_worker.work);
1891 struct rpc_xprt *xprt = &transport->xprt;
1892 struct socket *sock;
1893 int status = -EIO;
1894
1895 if (xprt->shutdown)
1896 goto out;
1897
1898 current->flags |= PF_FSTRANS;
1899
1900 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1901 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1902 SOCK_STREAM, 0, &sock, 1);
1903 if (status < 0) {
1904 dprintk("RPC: can't create AF_LOCAL "
1905 "transport socket (%d).\n", -status);
1906 goto out;
1907 }
1908 xs_reclassify_socketu(sock);
1909
1910 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1911 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1912
1913 status = xs_local_finish_connecting(xprt, sock);
1914 switch (status) {
1915 case 0:
1916 dprintk("RPC: xprt %p connected to %s\n",
1917 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1918 xprt_set_connected(xprt);
1919 break;
1920 case -ENOENT:
1921 dprintk("RPC: xprt %p: socket %s does not exist\n",
1922 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1923 break;
1924 default:
1925 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1926 __func__, -status,
1927 xprt->address_strings[RPC_DISPLAY_ADDR]);
1928 }
1929
1930out:
1931 xprt_clear_connecting(xprt);
1932 xprt_wake_pending_tasks(xprt, status);
1933 current->flags &= ~PF_FSTRANS;
1934}
1935
1936static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1937{
1938 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1939
1940 if (!transport->inet) {
1941 struct sock *sk = sock->sk;
1942
1943 write_lock_bh(&sk->sk_callback_lock);
1944
1945 xs_save_old_callbacks(transport, sk);
1946
1947 sk->sk_user_data = xprt;
1948 sk->sk_data_ready = xs_udp_data_ready;
1949 sk->sk_write_space = xs_udp_write_space;
1950 sk->sk_error_report = xs_error_report;
1951 sk->sk_no_check = UDP_CSUM_NORCV;
1952 sk->sk_allocation = GFP_ATOMIC;
1953
1954 xprt_set_connected(xprt);
1955
1956 /* Reset to new socket */
1957 transport->sock = sock;
1958 transport->inet = sk;
1959
1960 write_unlock_bh(&sk->sk_callback_lock);
1961 }
1962 xs_udp_do_set_buffer_size(xprt);
1963}
1964
1965static void xs_udp_setup_socket(struct work_struct *work)
1966{
1967 struct sock_xprt *transport =
1968 container_of(work, struct sock_xprt, connect_worker.work);
1969 struct rpc_xprt *xprt = &transport->xprt;
1970 struct socket *sock = transport->sock;
1971 int status = -EIO;
1972
1973 if (xprt->shutdown)
1974 goto out;
1975
1976 current->flags |= PF_FSTRANS;
1977
1978 /* Start by resetting any existing state */
1979 xs_reset_transport(transport);
1980 sock = xs_create_sock(xprt, transport,
1981 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1982 if (IS_ERR(sock))
1983 goto out;
1984
1985 dprintk("RPC: worker connecting xprt %p via %s to "
1986 "%s (port %s)\n", xprt,
1987 xprt->address_strings[RPC_DISPLAY_PROTO],
1988 xprt->address_strings[RPC_DISPLAY_ADDR],
1989 xprt->address_strings[RPC_DISPLAY_PORT]);
1990
1991 xs_udp_finish_connecting(xprt, sock);
1992 status = 0;
1993out:
1994 xprt_clear_connecting(xprt);
1995 xprt_wake_pending_tasks(xprt, status);
1996 current->flags &= ~PF_FSTRANS;
1997}
1998
1999/*
2000 * We need to preserve the port number so the reply cache on the server can
2001 * find our cached RPC replies when we get around to reconnecting.
2002 */
2003static void xs_abort_connection(struct sock_xprt *transport)
2004{
2005 int result;
2006 struct sockaddr any;
2007
2008 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2009
2010 /*
2011 * Disconnect the transport socket by doing a connect operation
2012 * with AF_UNSPEC. This should return immediately...
2013 */
2014 memset(&any, 0, sizeof(any));
2015 any.sa_family = AF_UNSPEC;
2016 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2017 if (!result)
2018 xs_sock_mark_closed(&transport->xprt);
2019 else
2020 dprintk("RPC: AF_UNSPEC connect return code %d\n",
2021 result);
2022}
2023
2024static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2025{
2026 unsigned int state = transport->inet->sk_state;
2027
2028 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2029 /* we don't need to abort the connection if the socket
2030 * hasn't undergone a shutdown
2031 */
2032 if (transport->inet->sk_shutdown == 0)
2033 return;
2034 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2035 __func__, transport->inet->sk_shutdown);
2036 }
2037 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2038 /* we don't need to abort the connection if the socket
2039 * hasn't undergone a shutdown
2040 */
2041 if (transport->inet->sk_shutdown == 0)
2042 return;
2043 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2044 "sk_shutdown set to %d\n",
2045 __func__, transport->inet->sk_shutdown);
2046 }
2047 xs_abort_connection(transport);
2048}
2049
2050static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2051{
2052 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2053 int ret = -ENOTCONN;
2054
2055 if (!transport->inet) {
2056 struct sock *sk = sock->sk;
2057
2058 write_lock_bh(&sk->sk_callback_lock);
2059
2060 xs_save_old_callbacks(transport, sk);
2061
2062 sk->sk_user_data = xprt;
2063 sk->sk_data_ready = xs_tcp_data_ready;
2064 sk->sk_state_change = xs_tcp_state_change;
2065 sk->sk_write_space = xs_tcp_write_space;
2066 sk->sk_error_report = xs_error_report;
2067 sk->sk_allocation = GFP_ATOMIC;
2068
2069 /* socket options */
2070 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2071 sock_reset_flag(sk, SOCK_LINGER);
2072 tcp_sk(sk)->linger2 = 0;
2073 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2074
2075 xprt_clear_connected(xprt);
2076
2077 /* Reset to new socket */
2078 transport->sock = sock;
2079 transport->inet = sk;
2080
2081 write_unlock_bh(&sk->sk_callback_lock);
2082 }
2083
2084 if (!xprt_bound(xprt))
2085 goto out;
2086
2087 /* Tell the socket layer to start connecting... */
2088 xprt->stat.connect_count++;
2089 xprt->stat.connect_start = jiffies;
2090 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2091 switch (ret) {
2092 case 0:
2093 case -EINPROGRESS:
2094 /* SYN_SENT! */
2095 xprt->connect_cookie++;
2096 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2097 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2098 }
2099out:
2100 return ret;
2101}
2102
2103/**
2104 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2105 * @xprt: RPC transport to connect
2106 * @transport: socket transport to connect
2107 * @create_sock: function to create a socket of the correct type
2108 *
2109 * Invoked by a work queue tasklet.
2110 */
2111static void xs_tcp_setup_socket(struct work_struct *work)
2112{
2113 struct sock_xprt *transport =
2114 container_of(work, struct sock_xprt, connect_worker.work);
2115 struct socket *sock = transport->sock;
2116 struct rpc_xprt *xprt = &transport->xprt;
2117 int status = -EIO;
2118
2119 if (xprt->shutdown)
2120 goto out;
2121
2122 current->flags |= PF_FSTRANS;
2123
2124 if (!sock) {
2125 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2126 sock = xs_create_sock(xprt, transport,
2127 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2128 if (IS_ERR(sock)) {
2129 status = PTR_ERR(sock);
2130 goto out;
2131 }
2132 } else {
2133 int abort_and_exit;
2134
2135 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2136 &xprt->state);
2137 /* "close" the socket, preserving the local port */
2138 xs_tcp_reuse_connection(transport);
2139
2140 if (abort_and_exit)
2141 goto out_eagain;
2142 }
2143
2144 dprintk("RPC: worker connecting xprt %p via %s to "
2145 "%s (port %s)\n", xprt,
2146 xprt->address_strings[RPC_DISPLAY_PROTO],
2147 xprt->address_strings[RPC_DISPLAY_ADDR],
2148 xprt->address_strings[RPC_DISPLAY_PORT]);
2149
2150 status = xs_tcp_finish_connecting(xprt, sock);
2151 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2152 xprt, -status, xprt_connected(xprt),
2153 sock->sk->sk_state);
2154 switch (status) {
2155 default:
2156 printk("%s: connect returned unhandled error %d\n",
2157 __func__, status);
2158 case -EADDRNOTAVAIL:
2159 /* We're probably in TIME_WAIT. Get rid of existing socket,
2160 * and retry
2161 */
2162 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
2163 xprt_force_disconnect(xprt);
2164 break;
2165 case -ECONNREFUSED:
2166 case -ECONNRESET:
2167 case -ENETUNREACH:
2168 /* retry with existing socket, after a delay */
2169 case 0:
2170 case -EINPROGRESS:
2171 case -EALREADY:
2172 xprt_clear_connecting(xprt);
2173 current->flags &= ~PF_FSTRANS;
2174 return;
2175 case -EINVAL:
2176 /* Happens, for instance, if the user specified a link
2177 * local IPv6 address without a scope-id.
2178 */
2179 goto out;
2180 }
2181out_eagain:
2182 status = -EAGAIN;
2183out:
2184 xprt_clear_connecting(xprt);
2185 xprt_wake_pending_tasks(xprt, status);
2186 current->flags &= ~PF_FSTRANS;
2187}
2188
2189/**
2190 * xs_connect - connect a socket to a remote endpoint
2191 * @task: address of RPC task that manages state of connect request
2192 *
2193 * TCP: If the remote end dropped the connection, delay reconnecting.
2194 *
2195 * UDP socket connects are synchronous, but we use a work queue anyway
2196 * to guarantee that even unprivileged user processes can set up a
2197 * socket on a privileged port.
2198 *
2199 * If a UDP socket connect fails, the delay behavior here prevents
2200 * retry floods (hard mounts).
2201 */
2202static void xs_connect(struct rpc_task *task)
2203{
2204 struct rpc_xprt *xprt = task->tk_xprt;
2205 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2206
2207 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2208 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2209 "seconds\n",
2210 xprt, xprt->reestablish_timeout / HZ);
2211 queue_delayed_work(rpciod_workqueue,
2212 &transport->connect_worker,
2213 xprt->reestablish_timeout);
2214 xprt->reestablish_timeout <<= 1;
2215 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2216 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2217 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2218 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2219 } else {
2220 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2221 queue_delayed_work(rpciod_workqueue,
2222 &transport->connect_worker, 0);
2223 }
2224}
2225
2226/**
2227 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2228 * @xprt: rpc_xprt struct containing statistics
2229 * @seq: output file
2230 *
2231 */
2232static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2233{
2234 long idle_time = 0;
2235
2236 if (xprt_connected(xprt))
2237 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2238
2239 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2240 "%llu %llu %lu %llu %llu\n",
2241 xprt->stat.bind_count,
2242 xprt->stat.connect_count,
2243 xprt->stat.connect_time,
2244 idle_time,
2245 xprt->stat.sends,
2246 xprt->stat.recvs,
2247 xprt->stat.bad_xids,
2248 xprt->stat.req_u,
2249 xprt->stat.bklog_u,
2250 xprt->stat.max_slots,
2251 xprt->stat.sending_u,
2252 xprt->stat.pending_u);
2253}
2254
2255/**
2256 * xs_udp_print_stats - display UDP socket-specifc stats
2257 * @xprt: rpc_xprt struct containing statistics
2258 * @seq: output file
2259 *
2260 */
2261static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2262{
2263 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2264
2265 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2266 "%lu %llu %llu\n",
2267 transport->srcport,
2268 xprt->stat.bind_count,
2269 xprt->stat.sends,
2270 xprt->stat.recvs,
2271 xprt->stat.bad_xids,
2272 xprt->stat.req_u,
2273 xprt->stat.bklog_u,
2274 xprt->stat.max_slots,
2275 xprt->stat.sending_u,
2276 xprt->stat.pending_u);
2277}
2278
2279/**
2280 * xs_tcp_print_stats - display TCP socket-specifc stats
2281 * @xprt: rpc_xprt struct containing statistics
2282 * @seq: output file
2283 *
2284 */
2285static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2286{
2287 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2288 long idle_time = 0;
2289
2290 if (xprt_connected(xprt))
2291 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2292
2293 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2294 "%llu %llu %lu %llu %llu\n",
2295 transport->srcport,
2296 xprt->stat.bind_count,
2297 xprt->stat.connect_count,
2298 xprt->stat.connect_time,
2299 idle_time,
2300 xprt->stat.sends,
2301 xprt->stat.recvs,
2302 xprt->stat.bad_xids,
2303 xprt->stat.req_u,
2304 xprt->stat.bklog_u,
2305 xprt->stat.max_slots,
2306 xprt->stat.sending_u,
2307 xprt->stat.pending_u);
2308}
2309
2310/*
2311 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2312 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2313 * to use the server side send routines.
2314 */
2315static void *bc_malloc(struct rpc_task *task, size_t size)
2316{
2317 struct page *page;
2318 struct rpc_buffer *buf;
2319
2320 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2321 page = alloc_page(GFP_KERNEL);
2322
2323 if (!page)
2324 return NULL;
2325
2326 buf = page_address(page);
2327 buf->len = PAGE_SIZE;
2328
2329 return buf->data;
2330}
2331
2332/*
2333 * Free the space allocated in the bc_alloc routine
2334 */
2335static void bc_free(void *buffer)
2336{
2337 struct rpc_buffer *buf;
2338
2339 if (!buffer)
2340 return;
2341
2342 buf = container_of(buffer, struct rpc_buffer, data);
2343 free_page((unsigned long)buf);
2344}
2345
2346/*
2347 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2348 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2349 */
2350static int bc_sendto(struct rpc_rqst *req)
2351{
2352 int len;
2353 struct xdr_buf *xbufp = &req->rq_snd_buf;
2354 struct rpc_xprt *xprt = req->rq_xprt;
2355 struct sock_xprt *transport =
2356 container_of(xprt, struct sock_xprt, xprt);
2357 struct socket *sock = transport->sock;
2358 unsigned long headoff;
2359 unsigned long tailoff;
2360
2361 xs_encode_stream_record_marker(xbufp);
2362
2363 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2364 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2365 len = svc_send_common(sock, xbufp,
2366 virt_to_page(xbufp->head[0].iov_base), headoff,
2367 xbufp->tail[0].iov_base, tailoff);
2368
2369 if (len != xbufp->len) {
2370 printk(KERN_NOTICE "Error sending entire callback!\n");
2371 len = -EAGAIN;
2372 }
2373
2374 return len;
2375}
2376
2377/*
2378 * The send routine. Borrows from svc_send
2379 */
2380static int bc_send_request(struct rpc_task *task)
2381{
2382 struct rpc_rqst *req = task->tk_rqstp;
2383 struct svc_xprt *xprt;
2384 struct svc_sock *svsk;
2385 u32 len;
2386
2387 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2388 /*
2389 * Get the server socket associated with this callback xprt
2390 */
2391 xprt = req->rq_xprt->bc_xprt;
2392 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2393
2394 /*
2395 * Grab the mutex to serialize data as the connection is shared
2396 * with the fore channel
2397 */
2398 if (!mutex_trylock(&xprt->xpt_mutex)) {
2399 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2400 if (!mutex_trylock(&xprt->xpt_mutex))
2401 return -EAGAIN;
2402 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2403 }
2404 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2405 len = -ENOTCONN;
2406 else
2407 len = bc_sendto(req);
2408 mutex_unlock(&xprt->xpt_mutex);
2409
2410 if (len > 0)
2411 len = 0;
2412
2413 return len;
2414}
2415
2416/*
2417 * The close routine. Since this is client initiated, we do nothing
2418 */
2419
2420static void bc_close(struct rpc_xprt *xprt)
2421{
2422}
2423
2424/*
2425 * The xprt destroy routine. Again, because this connection is client
2426 * initiated, we do nothing
2427 */
2428
2429static void bc_destroy(struct rpc_xprt *xprt)
2430{
2431}
2432
2433static struct rpc_xprt_ops xs_local_ops = {
2434 .reserve_xprt = xprt_reserve_xprt,
2435 .release_xprt = xs_tcp_release_xprt,
2436 .rpcbind = xs_local_rpcbind,
2437 .set_port = xs_local_set_port,
2438 .connect = xs_connect,
2439 .buf_alloc = rpc_malloc,
2440 .buf_free = rpc_free,
2441 .send_request = xs_local_send_request,
2442 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2443 .close = xs_close,
2444 .destroy = xs_destroy,
2445 .print_stats = xs_local_print_stats,
2446};
2447
2448static struct rpc_xprt_ops xs_udp_ops = {
2449 .set_buffer_size = xs_udp_set_buffer_size,
2450 .reserve_xprt = xprt_reserve_xprt_cong,
2451 .release_xprt = xprt_release_xprt_cong,
2452 .rpcbind = rpcb_getport_async,
2453 .set_port = xs_set_port,
2454 .connect = xs_connect,
2455 .buf_alloc = rpc_malloc,
2456 .buf_free = rpc_free,
2457 .send_request = xs_udp_send_request,
2458 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2459 .timer = xs_udp_timer,
2460 .release_request = xprt_release_rqst_cong,
2461 .close = xs_close,
2462 .destroy = xs_destroy,
2463 .print_stats = xs_udp_print_stats,
2464};
2465
2466static struct rpc_xprt_ops xs_tcp_ops = {
2467 .reserve_xprt = xprt_reserve_xprt,
2468 .release_xprt = xs_tcp_release_xprt,
2469 .rpcbind = rpcb_getport_async,
2470 .set_port = xs_set_port,
2471 .connect = xs_connect,
2472 .buf_alloc = rpc_malloc,
2473 .buf_free = rpc_free,
2474 .send_request = xs_tcp_send_request,
2475 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2476 .close = xs_tcp_close,
2477 .destroy = xs_destroy,
2478 .print_stats = xs_tcp_print_stats,
2479};
2480
2481/*
2482 * The rpc_xprt_ops for the server backchannel
2483 */
2484
2485static struct rpc_xprt_ops bc_tcp_ops = {
2486 .reserve_xprt = xprt_reserve_xprt,
2487 .release_xprt = xprt_release_xprt,
2488 .rpcbind = xs_local_rpcbind,
2489 .buf_alloc = bc_malloc,
2490 .buf_free = bc_free,
2491 .send_request = bc_send_request,
2492 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2493 .close = bc_close,
2494 .destroy = bc_destroy,
2495 .print_stats = xs_tcp_print_stats,
2496};
2497
2498static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2499{
2500 static const struct sockaddr_in sin = {
2501 .sin_family = AF_INET,
2502 .sin_addr.s_addr = htonl(INADDR_ANY),
2503 };
2504 static const struct sockaddr_in6 sin6 = {
2505 .sin6_family = AF_INET6,
2506 .sin6_addr = IN6ADDR_ANY_INIT,
2507 };
2508
2509 switch (family) {
2510 case AF_LOCAL:
2511 break;
2512 case AF_INET:
2513 memcpy(sap, &sin, sizeof(sin));
2514 break;
2515 case AF_INET6:
2516 memcpy(sap, &sin6, sizeof(sin6));
2517 break;
2518 default:
2519 dprintk("RPC: %s: Bad address family\n", __func__);
2520 return -EAFNOSUPPORT;
2521 }
2522 return 0;
2523}
2524
2525static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2526 unsigned int slot_table_size,
2527 unsigned int max_slot_table_size)
2528{
2529 struct rpc_xprt *xprt;
2530 struct sock_xprt *new;
2531
2532 if (args->addrlen > sizeof(xprt->addr)) {
2533 dprintk("RPC: xs_setup_xprt: address too large\n");
2534 return ERR_PTR(-EBADF);
2535 }
2536
2537 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2538 max_slot_table_size);
2539 if (xprt == NULL) {
2540 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2541 "rpc_xprt\n");
2542 return ERR_PTR(-ENOMEM);
2543 }
2544
2545 new = container_of(xprt, struct sock_xprt, xprt);
2546 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2547 xprt->addrlen = args->addrlen;
2548 if (args->srcaddr)
2549 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2550 else {
2551 int err;
2552 err = xs_init_anyaddr(args->dstaddr->sa_family,
2553 (struct sockaddr *)&new->srcaddr);
2554 if (err != 0) {
2555 xprt_free(xprt);
2556 return ERR_PTR(err);
2557 }
2558 }
2559
2560 return xprt;
2561}
2562
2563static const struct rpc_timeout xs_local_default_timeout = {
2564 .to_initval = 10 * HZ,
2565 .to_maxval = 10 * HZ,
2566 .to_retries = 2,
2567};
2568
2569/**
2570 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2571 * @args: rpc transport creation arguments
2572 *
2573 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2574 */
2575static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2576{
2577 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2578 struct sock_xprt *transport;
2579 struct rpc_xprt *xprt;
2580 struct rpc_xprt *ret;
2581
2582 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2583 xprt_max_tcp_slot_table_entries);
2584 if (IS_ERR(xprt))
2585 return xprt;
2586 transport = container_of(xprt, struct sock_xprt, xprt);
2587
2588 xprt->prot = 0;
2589 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2590 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2591
2592 xprt->bind_timeout = XS_BIND_TO;
2593 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2594 xprt->idle_timeout = XS_IDLE_DISC_TO;
2595
2596 xprt->ops = &xs_local_ops;
2597 xprt->timeout = &xs_local_default_timeout;
2598
2599 switch (sun->sun_family) {
2600 case AF_LOCAL:
2601 if (sun->sun_path[0] != '/') {
2602 dprintk("RPC: bad AF_LOCAL address: %s\n",
2603 sun->sun_path);
2604 ret = ERR_PTR(-EINVAL);
2605 goto out_err;
2606 }
2607 xprt_set_bound(xprt);
2608 INIT_DELAYED_WORK(&transport->connect_worker,
2609 xs_local_setup_socket);
2610 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2611 break;
2612 default:
2613 ret = ERR_PTR(-EAFNOSUPPORT);
2614 goto out_err;
2615 }
2616
2617 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2618 xprt->address_strings[RPC_DISPLAY_ADDR]);
2619
2620 if (try_module_get(THIS_MODULE))
2621 return xprt;
2622 ret = ERR_PTR(-EINVAL);
2623out_err:
2624 xprt_free(xprt);
2625 return ret;
2626}
2627
2628static const struct rpc_timeout xs_udp_default_timeout = {
2629 .to_initval = 5 * HZ,
2630 .to_maxval = 30 * HZ,
2631 .to_increment = 5 * HZ,
2632 .to_retries = 5,
2633};
2634
2635/**
2636 * xs_setup_udp - Set up transport to use a UDP socket
2637 * @args: rpc transport creation arguments
2638 *
2639 */
2640static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2641{
2642 struct sockaddr *addr = args->dstaddr;
2643 struct rpc_xprt *xprt;
2644 struct sock_xprt *transport;
2645 struct rpc_xprt *ret;
2646
2647 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2648 xprt_udp_slot_table_entries);
2649 if (IS_ERR(xprt))
2650 return xprt;
2651 transport = container_of(xprt, struct sock_xprt, xprt);
2652
2653 xprt->prot = IPPROTO_UDP;
2654 xprt->tsh_size = 0;
2655 /* XXX: header size can vary due to auth type, IPv6, etc. */
2656 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2657
2658 xprt->bind_timeout = XS_BIND_TO;
2659 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2660 xprt->idle_timeout = XS_IDLE_DISC_TO;
2661
2662 xprt->ops = &xs_udp_ops;
2663
2664 xprt->timeout = &xs_udp_default_timeout;
2665
2666 switch (addr->sa_family) {
2667 case AF_INET:
2668 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2669 xprt_set_bound(xprt);
2670
2671 INIT_DELAYED_WORK(&transport->connect_worker,
2672 xs_udp_setup_socket);
2673 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2674 break;
2675 case AF_INET6:
2676 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2677 xprt_set_bound(xprt);
2678
2679 INIT_DELAYED_WORK(&transport->connect_worker,
2680 xs_udp_setup_socket);
2681 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2682 break;
2683 default:
2684 ret = ERR_PTR(-EAFNOSUPPORT);
2685 goto out_err;
2686 }
2687
2688 if (xprt_bound(xprt))
2689 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2690 xprt->address_strings[RPC_DISPLAY_ADDR],
2691 xprt->address_strings[RPC_DISPLAY_PORT],
2692 xprt->address_strings[RPC_DISPLAY_PROTO]);
2693 else
2694 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2695 xprt->address_strings[RPC_DISPLAY_ADDR],
2696 xprt->address_strings[RPC_DISPLAY_PROTO]);
2697
2698 if (try_module_get(THIS_MODULE))
2699 return xprt;
2700 ret = ERR_PTR(-EINVAL);
2701out_err:
2702 xprt_free(xprt);
2703 return ret;
2704}
2705
2706static const struct rpc_timeout xs_tcp_default_timeout = {
2707 .to_initval = 60 * HZ,
2708 .to_maxval = 60 * HZ,
2709 .to_retries = 2,
2710};
2711
2712/**
2713 * xs_setup_tcp - Set up transport to use a TCP socket
2714 * @args: rpc transport creation arguments
2715 *
2716 */
2717static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2718{
2719 struct sockaddr *addr = args->dstaddr;
2720 struct rpc_xprt *xprt;
2721 struct sock_xprt *transport;
2722 struct rpc_xprt *ret;
2723
2724 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2725 xprt_max_tcp_slot_table_entries);
2726 if (IS_ERR(xprt))
2727 return xprt;
2728 transport = container_of(xprt, struct sock_xprt, xprt);
2729
2730 xprt->prot = IPPROTO_TCP;
2731 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2732 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2733
2734 xprt->bind_timeout = XS_BIND_TO;
2735 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2736 xprt->idle_timeout = XS_IDLE_DISC_TO;
2737
2738 xprt->ops = &xs_tcp_ops;
2739 xprt->timeout = &xs_tcp_default_timeout;
2740
2741 switch (addr->sa_family) {
2742 case AF_INET:
2743 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2744 xprt_set_bound(xprt);
2745
2746 INIT_DELAYED_WORK(&transport->connect_worker,
2747 xs_tcp_setup_socket);
2748 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2749 break;
2750 case AF_INET6:
2751 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2752 xprt_set_bound(xprt);
2753
2754 INIT_DELAYED_WORK(&transport->connect_worker,
2755 xs_tcp_setup_socket);
2756 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2757 break;
2758 default:
2759 ret = ERR_PTR(-EAFNOSUPPORT);
2760 goto out_err;
2761 }
2762
2763 if (xprt_bound(xprt))
2764 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2765 xprt->address_strings[RPC_DISPLAY_ADDR],
2766 xprt->address_strings[RPC_DISPLAY_PORT],
2767 xprt->address_strings[RPC_DISPLAY_PROTO]);
2768 else
2769 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2770 xprt->address_strings[RPC_DISPLAY_ADDR],
2771 xprt->address_strings[RPC_DISPLAY_PROTO]);
2772
2773
2774 if (try_module_get(THIS_MODULE))
2775 return xprt;
2776 ret = ERR_PTR(-EINVAL);
2777out_err:
2778 xprt_free(xprt);
2779 return ret;
2780}
2781
2782/**
2783 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2784 * @args: rpc transport creation arguments
2785 *
2786 */
2787static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2788{
2789 struct sockaddr *addr = args->dstaddr;
2790 struct rpc_xprt *xprt;
2791 struct sock_xprt *transport;
2792 struct svc_sock *bc_sock;
2793 struct rpc_xprt *ret;
2794
2795 if (args->bc_xprt->xpt_bc_xprt) {
2796 /*
2797 * This server connection already has a backchannel
2798 * export; we can't create a new one, as we wouldn't be
2799 * able to match replies based on xid any more. So,
2800 * reuse the already-existing one:
2801 */
2802 return args->bc_xprt->xpt_bc_xprt;
2803 }
2804 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2805 xprt_tcp_slot_table_entries);
2806 if (IS_ERR(xprt))
2807 return xprt;
2808 transport = container_of(xprt, struct sock_xprt, xprt);
2809
2810 xprt->prot = IPPROTO_TCP;
2811 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2812 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2813 xprt->timeout = &xs_tcp_default_timeout;
2814
2815 /* backchannel */
2816 xprt_set_bound(xprt);
2817 xprt->bind_timeout = 0;
2818 xprt->reestablish_timeout = 0;
2819 xprt->idle_timeout = 0;
2820
2821 xprt->ops = &bc_tcp_ops;
2822
2823 switch (addr->sa_family) {
2824 case AF_INET:
2825 xs_format_peer_addresses(xprt, "tcp",
2826 RPCBIND_NETID_TCP);
2827 break;
2828 case AF_INET6:
2829 xs_format_peer_addresses(xprt, "tcp",
2830 RPCBIND_NETID_TCP6);
2831 break;
2832 default:
2833 ret = ERR_PTR(-EAFNOSUPPORT);
2834 goto out_err;
2835 }
2836
2837 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2838 xprt->address_strings[RPC_DISPLAY_ADDR],
2839 xprt->address_strings[RPC_DISPLAY_PORT],
2840 xprt->address_strings[RPC_DISPLAY_PROTO]);
2841
2842 /*
2843 * Once we've associated a backchannel xprt with a connection,
2844 * we want to keep it around as long as long as the connection
2845 * lasts, in case we need to start using it for a backchannel
2846 * again; this reference won't be dropped until bc_xprt is
2847 * destroyed.
2848 */
2849 xprt_get(xprt);
2850 args->bc_xprt->xpt_bc_xprt = xprt;
2851 xprt->bc_xprt = args->bc_xprt;
2852 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2853 transport->sock = bc_sock->sk_sock;
2854 transport->inet = bc_sock->sk_sk;
2855
2856 /*
2857 * Since we don't want connections for the backchannel, we set
2858 * the xprt status to connected
2859 */
2860 xprt_set_connected(xprt);
2861
2862
2863 if (try_module_get(THIS_MODULE))
2864 return xprt;
2865 xprt_put(xprt);
2866 ret = ERR_PTR(-EINVAL);
2867out_err:
2868 xprt_free(xprt);
2869 return ret;
2870}
2871
2872static struct xprt_class xs_local_transport = {
2873 .list = LIST_HEAD_INIT(xs_local_transport.list),
2874 .name = "named UNIX socket",
2875 .owner = THIS_MODULE,
2876 .ident = XPRT_TRANSPORT_LOCAL,
2877 .setup = xs_setup_local,
2878};
2879
2880static struct xprt_class xs_udp_transport = {
2881 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2882 .name = "udp",
2883 .owner = THIS_MODULE,
2884 .ident = XPRT_TRANSPORT_UDP,
2885 .setup = xs_setup_udp,
2886};
2887
2888static struct xprt_class xs_tcp_transport = {
2889 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2890 .name = "tcp",
2891 .owner = THIS_MODULE,
2892 .ident = XPRT_TRANSPORT_TCP,
2893 .setup = xs_setup_tcp,
2894};
2895
2896static struct xprt_class xs_bc_tcp_transport = {
2897 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2898 .name = "tcp NFSv4.1 backchannel",
2899 .owner = THIS_MODULE,
2900 .ident = XPRT_TRANSPORT_BC_TCP,
2901 .setup = xs_setup_bc_tcp,
2902};
2903
2904/**
2905 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2906 *
2907 */
2908int init_socket_xprt(void)
2909{
2910#ifdef RPC_DEBUG
2911 if (!sunrpc_table_header)
2912 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2913#endif
2914
2915 xprt_register_transport(&xs_local_transport);
2916 xprt_register_transport(&xs_udp_transport);
2917 xprt_register_transport(&xs_tcp_transport);
2918 xprt_register_transport(&xs_bc_tcp_transport);
2919
2920 return 0;
2921}
2922
2923/**
2924 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2925 *
2926 */
2927void cleanup_socket_xprt(void)
2928{
2929#ifdef RPC_DEBUG
2930 if (sunrpc_table_header) {
2931 unregister_sysctl_table(sunrpc_table_header);
2932 sunrpc_table_header = NULL;
2933 }
2934#endif
2935
2936 xprt_unregister_transport(&xs_local_transport);
2937 xprt_unregister_transport(&xs_udp_transport);
2938 xprt_unregister_transport(&xs_tcp_transport);
2939 xprt_unregister_transport(&xs_bc_tcp_transport);
2940}
2941
2942static int param_set_uint_minmax(const char *val,
2943 const struct kernel_param *kp,
2944 unsigned int min, unsigned int max)
2945{
2946 unsigned long num;
2947 int ret;
2948
2949 if (!val)
2950 return -EINVAL;
2951 ret = strict_strtoul(val, 0, &num);
2952 if (ret == -EINVAL || num < min || num > max)
2953 return -EINVAL;
2954 *((unsigned int *)kp->arg) = num;
2955 return 0;
2956}
2957
2958static int param_set_portnr(const char *val, const struct kernel_param *kp)
2959{
2960 return param_set_uint_minmax(val, kp,
2961 RPC_MIN_RESVPORT,
2962 RPC_MAX_RESVPORT);
2963}
2964
2965static struct kernel_param_ops param_ops_portnr = {
2966 .set = param_set_portnr,
2967 .get = param_get_uint,
2968};
2969
2970#define param_check_portnr(name, p) \
2971 __param_check(name, p, unsigned int);
2972
2973module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2974module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2975
2976static int param_set_slot_table_size(const char *val,
2977 const struct kernel_param *kp)
2978{
2979 return param_set_uint_minmax(val, kp,
2980 RPC_MIN_SLOT_TABLE,
2981 RPC_MAX_SLOT_TABLE);
2982}
2983
2984static struct kernel_param_ops param_ops_slot_table_size = {
2985 .set = param_set_slot_table_size,
2986 .get = param_get_uint,
2987};
2988
2989#define param_check_slot_table_size(name, p) \
2990 __param_check(name, p, unsigned int);
2991
2992static int param_set_max_slot_table_size(const char *val,
2993 const struct kernel_param *kp)
2994{
2995 return param_set_uint_minmax(val, kp,
2996 RPC_MIN_SLOT_TABLE,
2997 RPC_MAX_SLOT_TABLE_LIMIT);
2998}
2999
3000static struct kernel_param_ops param_ops_max_slot_table_size = {
3001 .set = param_set_max_slot_table_size,
3002 .get = param_get_uint,
3003};
3004
3005#define param_check_max_slot_table_size(name, p) \
3006 __param_check(name, p, unsigned int);
3007
3008module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3009 slot_table_size, 0644);
3010module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3011 max_slot_table_size, 0644);
3012module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3013 slot_table_size, 0644);
3014