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net: replace %p6 with %pI6
[deliverable/linux.git] / net / sunrpc / xprtsock.c
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/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44 * xprtsock tunables
45 */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
56 *
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
59 */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
73 */
74 static ctl_table xs_tunables_table[] = {
75 {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
80 .mode = 0644,
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
85 },
86 {
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
91 .mode = 0644,
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
107 },
108 {
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .ctl_name = 0,
121 },
122 };
123
124 static ctl_table sunrpc_table[] = {
125 {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
128 .mode = 0555,
129 .child = xs_tunables_table
130 },
131 {
132 .ctl_name = 0,
133 },
134 };
135
136 #endif
137
138 /*
139 * Time out for an RPC UDP socket connect. UDP socket connects are
140 * synchronous, but we set a timeout anyway in case of resource
141 * exhaustion on the local host.
142 */
143 #define XS_UDP_CONN_TO (5U * HZ)
144
145 /*
146 * Wait duration for an RPC TCP connection to be established. Solaris
147 * NFS over TCP uses 60 seconds, for example, which is in line with how
148 * long a server takes to reboot.
149 */
150 #define XS_TCP_CONN_TO (60U * HZ)
151
152 /*
153 * Wait duration for a reply from the RPC portmapper.
154 */
155 #define XS_BIND_TO (60U * HZ)
156
157 /*
158 * Delay if a UDP socket connect error occurs. This is most likely some
159 * kind of resource problem on the local host.
160 */
161 #define XS_UDP_REEST_TO (2U * HZ)
162
163 /*
164 * The reestablish timeout allows clients to delay for a bit before attempting
165 * to reconnect to a server that just dropped our connection.
166 *
167 * We implement an exponential backoff when trying to reestablish a TCP
168 * transport connection with the server. Some servers like to drop a TCP
169 * connection when they are overworked, so we start with a short timeout and
170 * increase over time if the server is down or not responding.
171 */
172 #define XS_TCP_INIT_REEST_TO (3U * HZ)
173 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
174
175 /*
176 * TCP idle timeout; client drops the transport socket if it is idle
177 * for this long. Note that we also timeout UDP sockets to prevent
178 * holding port numbers when there is no RPC traffic.
179 */
180 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
181
182 #ifdef RPC_DEBUG
183 # undef RPC_DEBUG_DATA
184 # define RPCDBG_FACILITY RPCDBG_TRANS
185 #endif
186
187 #ifdef RPC_DEBUG_DATA
188 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
189 {
190 u8 *buf = (u8 *) packet;
191 int j;
192
193 dprintk("RPC: %s\n", msg);
194 for (j = 0; j < count && j < 128; j += 4) {
195 if (!(j & 31)) {
196 if (j)
197 dprintk("\n");
198 dprintk("0x%04x ", j);
199 }
200 dprintk("%02x%02x%02x%02x ",
201 buf[j], buf[j+1], buf[j+2], buf[j+3]);
202 }
203 dprintk("\n");
204 }
205 #else
206 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
207 {
208 /* NOP */
209 }
210 #endif
211
212 struct sock_xprt {
213 struct rpc_xprt xprt;
214
215 /*
216 * Network layer
217 */
218 struct socket * sock;
219 struct sock * inet;
220
221 /*
222 * State of TCP reply receive
223 */
224 __be32 tcp_fraghdr,
225 tcp_xid;
226
227 u32 tcp_offset,
228 tcp_reclen;
229
230 unsigned long tcp_copied,
231 tcp_flags;
232
233 /*
234 * Connection of transports
235 */
236 struct delayed_work connect_worker;
237 struct sockaddr_storage addr;
238 unsigned short port;
239
240 /*
241 * UDP socket buffer size parameters
242 */
243 size_t rcvsize,
244 sndsize;
245
246 /*
247 * Saved socket callback addresses
248 */
249 void (*old_data_ready)(struct sock *, int);
250 void (*old_state_change)(struct sock *);
251 void (*old_write_space)(struct sock *);
252 };
253
254 /*
255 * TCP receive state flags
256 */
257 #define TCP_RCV_LAST_FRAG (1UL << 0)
258 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
259 #define TCP_RCV_COPY_XID (1UL << 2)
260 #define TCP_RCV_COPY_DATA (1UL << 3)
261
262 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
263 {
264 return (struct sockaddr *) &xprt->addr;
265 }
266
267 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
268 {
269 return (struct sockaddr_in *) &xprt->addr;
270 }
271
272 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
273 {
274 return (struct sockaddr_in6 *) &xprt->addr;
275 }
276
277 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
278 const char *protocol,
279 const char *netid)
280 {
281 struct sockaddr_in *addr = xs_addr_in(xprt);
282 char *buf;
283
284 buf = kzalloc(20, GFP_KERNEL);
285 if (buf) {
286 snprintf(buf, 20, NIPQUAD_FMT,
287 NIPQUAD(addr->sin_addr.s_addr));
288 }
289 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
290
291 buf = kzalloc(8, GFP_KERNEL);
292 if (buf) {
293 snprintf(buf, 8, "%u",
294 ntohs(addr->sin_port));
295 }
296 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
297
298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299
300 buf = kzalloc(48, GFP_KERNEL);
301 if (buf) {
302 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
303 NIPQUAD(addr->sin_addr.s_addr),
304 ntohs(addr->sin_port),
305 protocol);
306 }
307 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
308
309 buf = kzalloc(10, GFP_KERNEL);
310 if (buf) {
311 snprintf(buf, 10, "%02x%02x%02x%02x",
312 NIPQUAD(addr->sin_addr.s_addr));
313 }
314 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
315
316 buf = kzalloc(8, GFP_KERNEL);
317 if (buf) {
318 snprintf(buf, 8, "%4hx",
319 ntohs(addr->sin_port));
320 }
321 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
322
323 buf = kzalloc(30, GFP_KERNEL);
324 if (buf) {
325 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
326 NIPQUAD(addr->sin_addr.s_addr),
327 ntohs(addr->sin_port) >> 8,
328 ntohs(addr->sin_port) & 0xff);
329 }
330 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
331
332 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
333 }
334
335 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
336 const char *protocol,
337 const char *netid)
338 {
339 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
340 char *buf;
341
342 buf = kzalloc(40, GFP_KERNEL);
343 if (buf) {
344 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
345 }
346 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
347
348 buf = kzalloc(8, GFP_KERNEL);
349 if (buf) {
350 snprintf(buf, 8, "%u",
351 ntohs(addr->sin6_port));
352 }
353 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
354
355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
356
357 buf = kzalloc(64, GFP_KERNEL);
358 if (buf) {
359 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
360 &addr->sin6_addr,
361 ntohs(addr->sin6_port),
362 protocol);
363 }
364 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
365
366 buf = kzalloc(36, GFP_KERNEL);
367 if (buf)
368 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
369
370 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
371
372 buf = kzalloc(8, GFP_KERNEL);
373 if (buf) {
374 snprintf(buf, 8, "%4hx",
375 ntohs(addr->sin6_port));
376 }
377 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
378
379 buf = kzalloc(50, GFP_KERNEL);
380 if (buf) {
381 snprintf(buf, 50, "%pI6.%u.%u",
382 &addr->sin6_addr,
383 ntohs(addr->sin6_port) >> 8,
384 ntohs(addr->sin6_port) & 0xff);
385 }
386 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
387
388 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
389 }
390
391 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
392 {
393 unsigned int i;
394
395 for (i = 0; i < RPC_DISPLAY_MAX; i++)
396 switch (i) {
397 case RPC_DISPLAY_PROTO:
398 case RPC_DISPLAY_NETID:
399 continue;
400 default:
401 kfree(xprt->address_strings[i]);
402 }
403 }
404
405 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
406
407 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
408 {
409 struct msghdr msg = {
410 .msg_name = addr,
411 .msg_namelen = addrlen,
412 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
413 };
414 struct kvec iov = {
415 .iov_base = vec->iov_base + base,
416 .iov_len = vec->iov_len - base,
417 };
418
419 if (iov.iov_len != 0)
420 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
421 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
422 }
423
424 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
425 {
426 struct page **ppage;
427 unsigned int remainder;
428 int err, sent = 0;
429
430 remainder = xdr->page_len - base;
431 base += xdr->page_base;
432 ppage = xdr->pages + (base >> PAGE_SHIFT);
433 base &= ~PAGE_MASK;
434 for(;;) {
435 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
436 int flags = XS_SENDMSG_FLAGS;
437
438 remainder -= len;
439 if (remainder != 0 || more)
440 flags |= MSG_MORE;
441 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
442 if (remainder == 0 || err != len)
443 break;
444 sent += err;
445 ppage++;
446 base = 0;
447 }
448 if (sent == 0)
449 return err;
450 if (err > 0)
451 sent += err;
452 return sent;
453 }
454
455 /**
456 * xs_sendpages - write pages directly to a socket
457 * @sock: socket to send on
458 * @addr: UDP only -- address of destination
459 * @addrlen: UDP only -- length of destination address
460 * @xdr: buffer containing this request
461 * @base: starting position in the buffer
462 *
463 */
464 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
465 {
466 unsigned int remainder = xdr->len - base;
467 int err, sent = 0;
468
469 if (unlikely(!sock))
470 return -ENOTCONN;
471
472 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
473 if (base != 0) {
474 addr = NULL;
475 addrlen = 0;
476 }
477
478 if (base < xdr->head[0].iov_len || addr != NULL) {
479 unsigned int len = xdr->head[0].iov_len - base;
480 remainder -= len;
481 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
482 if (remainder == 0 || err != len)
483 goto out;
484 sent += err;
485 base = 0;
486 } else
487 base -= xdr->head[0].iov_len;
488
489 if (base < xdr->page_len) {
490 unsigned int len = xdr->page_len - base;
491 remainder -= len;
492 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
493 if (remainder == 0 || err != len)
494 goto out;
495 sent += err;
496 base = 0;
497 } else
498 base -= xdr->page_len;
499
500 if (base >= xdr->tail[0].iov_len)
501 return sent;
502 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
503 out:
504 if (sent == 0)
505 return err;
506 if (err > 0)
507 sent += err;
508 return sent;
509 }
510
511 static void xs_nospace_callback(struct rpc_task *task)
512 {
513 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
514
515 transport->inet->sk_write_pending--;
516 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
517 }
518
519 /**
520 * xs_nospace - place task on wait queue if transmit was incomplete
521 * @task: task to put to sleep
522 *
523 */
524 static void xs_nospace(struct rpc_task *task)
525 {
526 struct rpc_rqst *req = task->tk_rqstp;
527 struct rpc_xprt *xprt = req->rq_xprt;
528 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
529
530 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
531 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
532 req->rq_slen);
533
534 /* Protect against races with write_space */
535 spin_lock_bh(&xprt->transport_lock);
536
537 /* Don't race with disconnect */
538 if (xprt_connected(xprt)) {
539 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
540 /*
541 * Notify TCP that we're limited by the application
542 * window size
543 */
544 set_bit(SOCK_NOSPACE, &transport->sock->flags);
545 transport->inet->sk_write_pending++;
546 /* ...and wait for more buffer space */
547 xprt_wait_for_buffer_space(task, xs_nospace_callback);
548 }
549 } else {
550 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
551 task->tk_status = -ENOTCONN;
552 }
553
554 spin_unlock_bh(&xprt->transport_lock);
555 }
556
557 /**
558 * xs_udp_send_request - write an RPC request to a UDP socket
559 * @task: address of RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568 static int xs_udp_send_request(struct rpc_task *task)
569 {
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
573 struct xdr_buf *xdr = &req->rq_snd_buf;
574 int status;
575
576 xs_pktdump("packet data:",
577 req->rq_svec->iov_base,
578 req->rq_svec->iov_len);
579
580 status = xs_sendpages(transport->sock,
581 xs_addr(xprt),
582 xprt->addrlen, xdr,
583 req->rq_bytes_sent);
584
585 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
586 xdr->len - req->rq_bytes_sent, status);
587
588 if (status >= 0) {
589 task->tk_bytes_sent += status;
590 if (status >= req->rq_slen)
591 return 0;
592 /* Still some bytes left; set up for a retry later. */
593 status = -EAGAIN;
594 }
595
596 switch (status) {
597 case -EAGAIN:
598 xs_nospace(task);
599 break;
600 case -ENETUNREACH:
601 case -EPIPE:
602 case -ECONNREFUSED:
603 /* When the server has died, an ICMP port unreachable message
604 * prompts ECONNREFUSED. */
605 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
606 break;
607 default:
608 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
609 dprintk("RPC: sendmsg returned unrecognized error %d\n",
610 -status);
611 }
612
613 return status;
614 }
615
616 /**
617 * xs_tcp_shutdown - gracefully shut down a TCP socket
618 * @xprt: transport
619 *
620 * Initiates a graceful shutdown of the TCP socket by calling the
621 * equivalent of shutdown(SHUT_WR);
622 */
623 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
624 {
625 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
626 struct socket *sock = transport->sock;
627
628 if (sock != NULL)
629 kernel_sock_shutdown(sock, SHUT_WR);
630 }
631
632 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
633 {
634 u32 reclen = buf->len - sizeof(rpc_fraghdr);
635 rpc_fraghdr *base = buf->head[0].iov_base;
636 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
637 }
638
639 /**
640 * xs_tcp_send_request - write an RPC request to a TCP socket
641 * @task: address of RPC task that manages the state of an RPC request
642 *
643 * Return values:
644 * 0: The request has been sent
645 * EAGAIN: The socket was blocked, please call again later to
646 * complete the request
647 * ENOTCONN: Caller needs to invoke connect logic then call again
648 * other: Some other error occured, the request was not sent
649 *
650 * XXX: In the case of soft timeouts, should we eventually give up
651 * if sendmsg is not able to make progress?
652 */
653 static int xs_tcp_send_request(struct rpc_task *task)
654 {
655 struct rpc_rqst *req = task->tk_rqstp;
656 struct rpc_xprt *xprt = req->rq_xprt;
657 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
658 struct xdr_buf *xdr = &req->rq_snd_buf;
659 int status;
660
661 xs_encode_tcp_record_marker(&req->rq_snd_buf);
662
663 xs_pktdump("packet data:",
664 req->rq_svec->iov_base,
665 req->rq_svec->iov_len);
666
667 /* Continue transmitting the packet/record. We must be careful
668 * to cope with writespace callbacks arriving _after_ we have
669 * called sendmsg(). */
670 while (1) {
671 status = xs_sendpages(transport->sock,
672 NULL, 0, xdr, req->rq_bytes_sent);
673
674 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
675 xdr->len - req->rq_bytes_sent, status);
676
677 if (unlikely(status < 0))
678 break;
679
680 /* If we've sent the entire packet, immediately
681 * reset the count of bytes sent. */
682 req->rq_bytes_sent += status;
683 task->tk_bytes_sent += status;
684 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
685 req->rq_bytes_sent = 0;
686 return 0;
687 }
688
689 if (status != 0)
690 continue;
691 status = -EAGAIN;
692 break;
693 }
694
695 switch (status) {
696 case -EAGAIN:
697 xs_nospace(task);
698 break;
699 case -ECONNREFUSED:
700 case -ECONNRESET:
701 case -ENOTCONN:
702 case -EPIPE:
703 status = -ENOTCONN;
704 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
705 break;
706 default:
707 dprintk("RPC: sendmsg returned unrecognized error %d\n",
708 -status);
709 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
710 xs_tcp_shutdown(xprt);
711 }
712
713 return status;
714 }
715
716 /**
717 * xs_tcp_release_xprt - clean up after a tcp transmission
718 * @xprt: transport
719 * @task: rpc task
720 *
721 * This cleans up if an error causes us to abort the transmission of a request.
722 * In this case, the socket may need to be reset in order to avoid confusing
723 * the server.
724 */
725 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
726 {
727 struct rpc_rqst *req;
728
729 if (task != xprt->snd_task)
730 return;
731 if (task == NULL)
732 goto out_release;
733 req = task->tk_rqstp;
734 if (req->rq_bytes_sent == 0)
735 goto out_release;
736 if (req->rq_bytes_sent == req->rq_snd_buf.len)
737 goto out_release;
738 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
739 out_release:
740 xprt_release_xprt(xprt, task);
741 }
742
743 /**
744 * xs_close - close a socket
745 * @xprt: transport
746 *
747 * This is used when all requests are complete; ie, no DRC state remains
748 * on the server we want to save.
749 */
750 static void xs_close(struct rpc_xprt *xprt)
751 {
752 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
753 struct socket *sock = transport->sock;
754 struct sock *sk = transport->inet;
755
756 if (!sk)
757 goto clear_close_wait;
758
759 dprintk("RPC: xs_close xprt %p\n", xprt);
760
761 write_lock_bh(&sk->sk_callback_lock);
762 transport->inet = NULL;
763 transport->sock = NULL;
764
765 sk->sk_user_data = NULL;
766 sk->sk_data_ready = transport->old_data_ready;
767 sk->sk_state_change = transport->old_state_change;
768 sk->sk_write_space = transport->old_write_space;
769 write_unlock_bh(&sk->sk_callback_lock);
770
771 sk->sk_no_check = 0;
772
773 sock_release(sock);
774 clear_close_wait:
775 smp_mb__before_clear_bit();
776 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
777 clear_bit(XPRT_CLOSING, &xprt->state);
778 smp_mb__after_clear_bit();
779 xprt_disconnect_done(xprt);
780 }
781
782 /**
783 * xs_destroy - prepare to shutdown a transport
784 * @xprt: doomed transport
785 *
786 */
787 static void xs_destroy(struct rpc_xprt *xprt)
788 {
789 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
790
791 dprintk("RPC: xs_destroy xprt %p\n", xprt);
792
793 cancel_rearming_delayed_work(&transport->connect_worker);
794
795 xs_close(xprt);
796 xs_free_peer_addresses(xprt);
797 kfree(xprt->slot);
798 kfree(xprt);
799 module_put(THIS_MODULE);
800 }
801
802 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
803 {
804 return (struct rpc_xprt *) sk->sk_user_data;
805 }
806
807 /**
808 * xs_udp_data_ready - "data ready" callback for UDP sockets
809 * @sk: socket with data to read
810 * @len: how much data to read
811 *
812 */
813 static void xs_udp_data_ready(struct sock *sk, int len)
814 {
815 struct rpc_task *task;
816 struct rpc_xprt *xprt;
817 struct rpc_rqst *rovr;
818 struct sk_buff *skb;
819 int err, repsize, copied;
820 u32 _xid;
821 __be32 *xp;
822
823 read_lock(&sk->sk_callback_lock);
824 dprintk("RPC: xs_udp_data_ready...\n");
825 if (!(xprt = xprt_from_sock(sk)))
826 goto out;
827
828 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
829 goto out;
830
831 if (xprt->shutdown)
832 goto dropit;
833
834 repsize = skb->len - sizeof(struct udphdr);
835 if (repsize < 4) {
836 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
837 goto dropit;
838 }
839
840 /* Copy the XID from the skb... */
841 xp = skb_header_pointer(skb, sizeof(struct udphdr),
842 sizeof(_xid), &_xid);
843 if (xp == NULL)
844 goto dropit;
845
846 /* Look up and lock the request corresponding to the given XID */
847 spin_lock(&xprt->transport_lock);
848 rovr = xprt_lookup_rqst(xprt, *xp);
849 if (!rovr)
850 goto out_unlock;
851 task = rovr->rq_task;
852
853 if ((copied = rovr->rq_private_buf.buflen) > repsize)
854 copied = repsize;
855
856 /* Suck it into the iovec, verify checksum if not done by hw. */
857 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
858 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
859 goto out_unlock;
860 }
861
862 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
863
864 /* Something worked... */
865 dst_confirm(skb->dst);
866
867 xprt_adjust_cwnd(task, copied);
868 xprt_update_rtt(task);
869 xprt_complete_rqst(task, copied);
870
871 out_unlock:
872 spin_unlock(&xprt->transport_lock);
873 dropit:
874 skb_free_datagram(sk, skb);
875 out:
876 read_unlock(&sk->sk_callback_lock);
877 }
878
879 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
880 {
881 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
882 size_t len, used;
883 char *p;
884
885 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
886 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
887 used = xdr_skb_read_bits(desc, p, len);
888 transport->tcp_offset += used;
889 if (used != len)
890 return;
891
892 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
893 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
894 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
895 else
896 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
897 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
898
899 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
900 transport->tcp_offset = 0;
901
902 /* Sanity check of the record length */
903 if (unlikely(transport->tcp_reclen < 4)) {
904 dprintk("RPC: invalid TCP record fragment length\n");
905 xprt_force_disconnect(xprt);
906 return;
907 }
908 dprintk("RPC: reading TCP record fragment of length %d\n",
909 transport->tcp_reclen);
910 }
911
912 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
913 {
914 if (transport->tcp_offset == transport->tcp_reclen) {
915 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
916 transport->tcp_offset = 0;
917 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
918 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
919 transport->tcp_flags |= TCP_RCV_COPY_XID;
920 transport->tcp_copied = 0;
921 }
922 }
923 }
924
925 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
926 {
927 size_t len, used;
928 char *p;
929
930 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
931 dprintk("RPC: reading XID (%Zu bytes)\n", len);
932 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
933 used = xdr_skb_read_bits(desc, p, len);
934 transport->tcp_offset += used;
935 if (used != len)
936 return;
937 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
938 transport->tcp_flags |= TCP_RCV_COPY_DATA;
939 transport->tcp_copied = 4;
940 dprintk("RPC: reading reply for XID %08x\n",
941 ntohl(transport->tcp_xid));
942 xs_tcp_check_fraghdr(transport);
943 }
944
945 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
946 {
947 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
948 struct rpc_rqst *req;
949 struct xdr_buf *rcvbuf;
950 size_t len;
951 ssize_t r;
952
953 /* Find and lock the request corresponding to this xid */
954 spin_lock(&xprt->transport_lock);
955 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
956 if (!req) {
957 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
958 dprintk("RPC: XID %08x request not found!\n",
959 ntohl(transport->tcp_xid));
960 spin_unlock(&xprt->transport_lock);
961 return;
962 }
963
964 rcvbuf = &req->rq_private_buf;
965 len = desc->count;
966 if (len > transport->tcp_reclen - transport->tcp_offset) {
967 struct xdr_skb_reader my_desc;
968
969 len = transport->tcp_reclen - transport->tcp_offset;
970 memcpy(&my_desc, desc, sizeof(my_desc));
971 my_desc.count = len;
972 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
973 &my_desc, xdr_skb_read_bits);
974 desc->count -= r;
975 desc->offset += r;
976 } else
977 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
978 desc, xdr_skb_read_bits);
979
980 if (r > 0) {
981 transport->tcp_copied += r;
982 transport->tcp_offset += r;
983 }
984 if (r != len) {
985 /* Error when copying to the receive buffer,
986 * usually because we weren't able to allocate
987 * additional buffer pages. All we can do now
988 * is turn off TCP_RCV_COPY_DATA, so the request
989 * will not receive any additional updates,
990 * and time out.
991 * Any remaining data from this record will
992 * be discarded.
993 */
994 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
995 dprintk("RPC: XID %08x truncated request\n",
996 ntohl(transport->tcp_xid));
997 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
998 "tcp_offset = %u, tcp_reclen = %u\n",
999 xprt, transport->tcp_copied,
1000 transport->tcp_offset, transport->tcp_reclen);
1001 goto out;
1002 }
1003
1004 dprintk("RPC: XID %08x read %Zd bytes\n",
1005 ntohl(transport->tcp_xid), r);
1006 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1007 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1008 transport->tcp_offset, transport->tcp_reclen);
1009
1010 if (transport->tcp_copied == req->rq_private_buf.buflen)
1011 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1012 else if (transport->tcp_offset == transport->tcp_reclen) {
1013 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1014 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1015 }
1016
1017 out:
1018 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1019 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1020 spin_unlock(&xprt->transport_lock);
1021 xs_tcp_check_fraghdr(transport);
1022 }
1023
1024 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1025 {
1026 size_t len;
1027
1028 len = transport->tcp_reclen - transport->tcp_offset;
1029 if (len > desc->count)
1030 len = desc->count;
1031 desc->count -= len;
1032 desc->offset += len;
1033 transport->tcp_offset += len;
1034 dprintk("RPC: discarded %Zu bytes\n", len);
1035 xs_tcp_check_fraghdr(transport);
1036 }
1037
1038 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1039 {
1040 struct rpc_xprt *xprt = rd_desc->arg.data;
1041 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1042 struct xdr_skb_reader desc = {
1043 .skb = skb,
1044 .offset = offset,
1045 .count = len,
1046 };
1047
1048 dprintk("RPC: xs_tcp_data_recv started\n");
1049 do {
1050 /* Read in a new fragment marker if necessary */
1051 /* Can we ever really expect to get completely empty fragments? */
1052 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1053 xs_tcp_read_fraghdr(xprt, &desc);
1054 continue;
1055 }
1056 /* Read in the xid if necessary */
1057 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1058 xs_tcp_read_xid(transport, &desc);
1059 continue;
1060 }
1061 /* Read in the request data */
1062 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1063 xs_tcp_read_request(xprt, &desc);
1064 continue;
1065 }
1066 /* Skip over any trailing bytes on short reads */
1067 xs_tcp_read_discard(transport, &desc);
1068 } while (desc.count);
1069 dprintk("RPC: xs_tcp_data_recv done\n");
1070 return len - desc.count;
1071 }
1072
1073 /**
1074 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1075 * @sk: socket with data to read
1076 * @bytes: how much data to read
1077 *
1078 */
1079 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1080 {
1081 struct rpc_xprt *xprt;
1082 read_descriptor_t rd_desc;
1083 int read;
1084
1085 dprintk("RPC: xs_tcp_data_ready...\n");
1086
1087 read_lock(&sk->sk_callback_lock);
1088 if (!(xprt = xprt_from_sock(sk)))
1089 goto out;
1090 if (xprt->shutdown)
1091 goto out;
1092
1093 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1094 rd_desc.arg.data = xprt;
1095 do {
1096 rd_desc.count = 65536;
1097 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1098 } while (read > 0);
1099 out:
1100 read_unlock(&sk->sk_callback_lock);
1101 }
1102
1103 /**
1104 * xs_tcp_state_change - callback to handle TCP socket state changes
1105 * @sk: socket whose state has changed
1106 *
1107 */
1108 static void xs_tcp_state_change(struct sock *sk)
1109 {
1110 struct rpc_xprt *xprt;
1111
1112 read_lock(&sk->sk_callback_lock);
1113 if (!(xprt = xprt_from_sock(sk)))
1114 goto out;
1115 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1116 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1117 sk->sk_state, xprt_connected(xprt),
1118 sock_flag(sk, SOCK_DEAD),
1119 sock_flag(sk, SOCK_ZAPPED));
1120
1121 switch (sk->sk_state) {
1122 case TCP_ESTABLISHED:
1123 spin_lock_bh(&xprt->transport_lock);
1124 if (!xprt_test_and_set_connected(xprt)) {
1125 struct sock_xprt *transport = container_of(xprt,
1126 struct sock_xprt, xprt);
1127
1128 /* Reset TCP record info */
1129 transport->tcp_offset = 0;
1130 transport->tcp_reclen = 0;
1131 transport->tcp_copied = 0;
1132 transport->tcp_flags =
1133 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1134
1135 xprt_wake_pending_tasks(xprt, 0);
1136 }
1137 spin_unlock_bh(&xprt->transport_lock);
1138 break;
1139 case TCP_FIN_WAIT1:
1140 /* The client initiated a shutdown of the socket */
1141 xprt->connect_cookie++;
1142 xprt->reestablish_timeout = 0;
1143 set_bit(XPRT_CLOSING, &xprt->state);
1144 smp_mb__before_clear_bit();
1145 clear_bit(XPRT_CONNECTED, &xprt->state);
1146 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1147 smp_mb__after_clear_bit();
1148 break;
1149 case TCP_CLOSE_WAIT:
1150 /* The server initiated a shutdown of the socket */
1151 set_bit(XPRT_CLOSING, &xprt->state);
1152 xprt_force_disconnect(xprt);
1153 case TCP_SYN_SENT:
1154 xprt->connect_cookie++;
1155 case TCP_CLOSING:
1156 /*
1157 * If the server closed down the connection, make sure that
1158 * we back off before reconnecting
1159 */
1160 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1161 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1162 break;
1163 case TCP_LAST_ACK:
1164 smp_mb__before_clear_bit();
1165 clear_bit(XPRT_CONNECTED, &xprt->state);
1166 smp_mb__after_clear_bit();
1167 break;
1168 case TCP_CLOSE:
1169 smp_mb__before_clear_bit();
1170 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1171 clear_bit(XPRT_CLOSING, &xprt->state);
1172 smp_mb__after_clear_bit();
1173 /* Mark transport as closed and wake up all pending tasks */
1174 xprt_disconnect_done(xprt);
1175 }
1176 out:
1177 read_unlock(&sk->sk_callback_lock);
1178 }
1179
1180 /**
1181 * xs_udp_write_space - callback invoked when socket buffer space
1182 * becomes available
1183 * @sk: socket whose state has changed
1184 *
1185 * Called when more output buffer space is available for this socket.
1186 * We try not to wake our writers until they can make "significant"
1187 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1188 * with a bunch of small requests.
1189 */
1190 static void xs_udp_write_space(struct sock *sk)
1191 {
1192 read_lock(&sk->sk_callback_lock);
1193
1194 /* from net/core/sock.c:sock_def_write_space */
1195 if (sock_writeable(sk)) {
1196 struct socket *sock;
1197 struct rpc_xprt *xprt;
1198
1199 if (unlikely(!(sock = sk->sk_socket)))
1200 goto out;
1201 clear_bit(SOCK_NOSPACE, &sock->flags);
1202
1203 if (unlikely(!(xprt = xprt_from_sock(sk))))
1204 goto out;
1205 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1206 goto out;
1207
1208 xprt_write_space(xprt);
1209 }
1210
1211 out:
1212 read_unlock(&sk->sk_callback_lock);
1213 }
1214
1215 /**
1216 * xs_tcp_write_space - callback invoked when socket buffer space
1217 * becomes available
1218 * @sk: socket whose state has changed
1219 *
1220 * Called when more output buffer space is available for this socket.
1221 * We try not to wake our writers until they can make "significant"
1222 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1223 * with a bunch of small requests.
1224 */
1225 static void xs_tcp_write_space(struct sock *sk)
1226 {
1227 read_lock(&sk->sk_callback_lock);
1228
1229 /* from net/core/stream.c:sk_stream_write_space */
1230 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1231 struct socket *sock;
1232 struct rpc_xprt *xprt;
1233
1234 if (unlikely(!(sock = sk->sk_socket)))
1235 goto out;
1236 clear_bit(SOCK_NOSPACE, &sock->flags);
1237
1238 if (unlikely(!(xprt = xprt_from_sock(sk))))
1239 goto out;
1240 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1241 goto out;
1242
1243 xprt_write_space(xprt);
1244 }
1245
1246 out:
1247 read_unlock(&sk->sk_callback_lock);
1248 }
1249
1250 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1251 {
1252 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1253 struct sock *sk = transport->inet;
1254
1255 if (transport->rcvsize) {
1256 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1257 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1258 }
1259 if (transport->sndsize) {
1260 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1261 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1262 sk->sk_write_space(sk);
1263 }
1264 }
1265
1266 /**
1267 * xs_udp_set_buffer_size - set send and receive limits
1268 * @xprt: generic transport
1269 * @sndsize: requested size of send buffer, in bytes
1270 * @rcvsize: requested size of receive buffer, in bytes
1271 *
1272 * Set socket send and receive buffer size limits.
1273 */
1274 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1275 {
1276 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1277
1278 transport->sndsize = 0;
1279 if (sndsize)
1280 transport->sndsize = sndsize + 1024;
1281 transport->rcvsize = 0;
1282 if (rcvsize)
1283 transport->rcvsize = rcvsize + 1024;
1284
1285 xs_udp_do_set_buffer_size(xprt);
1286 }
1287
1288 /**
1289 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1290 * @task: task that timed out
1291 *
1292 * Adjust the congestion window after a retransmit timeout has occurred.
1293 */
1294 static void xs_udp_timer(struct rpc_task *task)
1295 {
1296 xprt_adjust_cwnd(task, -ETIMEDOUT);
1297 }
1298
1299 static unsigned short xs_get_random_port(void)
1300 {
1301 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1302 unsigned short rand = (unsigned short) net_random() % range;
1303 return rand + xprt_min_resvport;
1304 }
1305
1306 /**
1307 * xs_set_port - reset the port number in the remote endpoint address
1308 * @xprt: generic transport
1309 * @port: new port number
1310 *
1311 */
1312 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1313 {
1314 struct sockaddr *addr = xs_addr(xprt);
1315
1316 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1317
1318 switch (addr->sa_family) {
1319 case AF_INET:
1320 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1321 break;
1322 case AF_INET6:
1323 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1324 break;
1325 default:
1326 BUG();
1327 }
1328 }
1329
1330 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1331 {
1332 unsigned short port = transport->port;
1333
1334 if (port == 0 && transport->xprt.resvport)
1335 port = xs_get_random_port();
1336 return port;
1337 }
1338
1339 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1340 {
1341 if (transport->port != 0)
1342 transport->port = 0;
1343 if (!transport->xprt.resvport)
1344 return 0;
1345 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1346 return xprt_max_resvport;
1347 return --port;
1348 }
1349
1350 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1351 {
1352 struct sockaddr_in myaddr = {
1353 .sin_family = AF_INET,
1354 };
1355 struct sockaddr_in *sa;
1356 int err, nloop = 0;
1357 unsigned short port = xs_get_srcport(transport, sock);
1358 unsigned short last;
1359
1360 sa = (struct sockaddr_in *)&transport->addr;
1361 myaddr.sin_addr = sa->sin_addr;
1362 do {
1363 myaddr.sin_port = htons(port);
1364 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1365 sizeof(myaddr));
1366 if (port == 0)
1367 break;
1368 if (err == 0) {
1369 transport->port = port;
1370 break;
1371 }
1372 last = port;
1373 port = xs_next_srcport(transport, sock, port);
1374 if (port > last)
1375 nloop++;
1376 } while (err == -EADDRINUSE && nloop != 2);
1377 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1378 __func__, NIPQUAD(myaddr.sin_addr),
1379 port, err ? "failed" : "ok", err);
1380 return err;
1381 }
1382
1383 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1384 {
1385 struct sockaddr_in6 myaddr = {
1386 .sin6_family = AF_INET6,
1387 };
1388 struct sockaddr_in6 *sa;
1389 int err, nloop = 0;
1390 unsigned short port = xs_get_srcport(transport, sock);
1391 unsigned short last;
1392
1393 sa = (struct sockaddr_in6 *)&transport->addr;
1394 myaddr.sin6_addr = sa->sin6_addr;
1395 do {
1396 myaddr.sin6_port = htons(port);
1397 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1398 sizeof(myaddr));
1399 if (port == 0)
1400 break;
1401 if (err == 0) {
1402 transport->port = port;
1403 break;
1404 }
1405 last = port;
1406 port = xs_next_srcport(transport, sock, port);
1407 if (port > last)
1408 nloop++;
1409 } while (err == -EADDRINUSE && nloop != 2);
1410 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1411 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1412 return err;
1413 }
1414
1415 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1416 static struct lock_class_key xs_key[2];
1417 static struct lock_class_key xs_slock_key[2];
1418
1419 static inline void xs_reclassify_socket4(struct socket *sock)
1420 {
1421 struct sock *sk = sock->sk;
1422
1423 BUG_ON(sock_owned_by_user(sk));
1424 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1425 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1426 }
1427
1428 static inline void xs_reclassify_socket6(struct socket *sock)
1429 {
1430 struct sock *sk = sock->sk;
1431
1432 BUG_ON(sock_owned_by_user(sk));
1433 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1434 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1435 }
1436 #else
1437 static inline void xs_reclassify_socket4(struct socket *sock)
1438 {
1439 }
1440
1441 static inline void xs_reclassify_socket6(struct socket *sock)
1442 {
1443 }
1444 #endif
1445
1446 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1447 {
1448 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1449
1450 if (!transport->inet) {
1451 struct sock *sk = sock->sk;
1452
1453 write_lock_bh(&sk->sk_callback_lock);
1454
1455 sk->sk_user_data = xprt;
1456 transport->old_data_ready = sk->sk_data_ready;
1457 transport->old_state_change = sk->sk_state_change;
1458 transport->old_write_space = sk->sk_write_space;
1459 sk->sk_data_ready = xs_udp_data_ready;
1460 sk->sk_write_space = xs_udp_write_space;
1461 sk->sk_no_check = UDP_CSUM_NORCV;
1462 sk->sk_allocation = GFP_ATOMIC;
1463
1464 xprt_set_connected(xprt);
1465
1466 /* Reset to new socket */
1467 transport->sock = sock;
1468 transport->inet = sk;
1469
1470 write_unlock_bh(&sk->sk_callback_lock);
1471 }
1472 xs_udp_do_set_buffer_size(xprt);
1473 }
1474
1475 /**
1476 * xs_udp_connect_worker4 - set up a UDP socket
1477 * @work: RPC transport to connect
1478 *
1479 * Invoked by a work queue tasklet.
1480 */
1481 static void xs_udp_connect_worker4(struct work_struct *work)
1482 {
1483 struct sock_xprt *transport =
1484 container_of(work, struct sock_xprt, connect_worker.work);
1485 struct rpc_xprt *xprt = &transport->xprt;
1486 struct socket *sock = transport->sock;
1487 int err, status = -EIO;
1488
1489 if (xprt->shutdown || !xprt_bound(xprt))
1490 goto out;
1491
1492 /* Start by resetting any existing state */
1493 xs_close(xprt);
1494
1495 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1496 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1497 goto out;
1498 }
1499 xs_reclassify_socket4(sock);
1500
1501 if (xs_bind4(transport, sock)) {
1502 sock_release(sock);
1503 goto out;
1504 }
1505
1506 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1507 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1508
1509 xs_udp_finish_connecting(xprt, sock);
1510 status = 0;
1511 out:
1512 xprt_wake_pending_tasks(xprt, status);
1513 xprt_clear_connecting(xprt);
1514 }
1515
1516 /**
1517 * xs_udp_connect_worker6 - set up a UDP socket
1518 * @work: RPC transport to connect
1519 *
1520 * Invoked by a work queue tasklet.
1521 */
1522 static void xs_udp_connect_worker6(struct work_struct *work)
1523 {
1524 struct sock_xprt *transport =
1525 container_of(work, struct sock_xprt, connect_worker.work);
1526 struct rpc_xprt *xprt = &transport->xprt;
1527 struct socket *sock = transport->sock;
1528 int err, status = -EIO;
1529
1530 if (xprt->shutdown || !xprt_bound(xprt))
1531 goto out;
1532
1533 /* Start by resetting any existing state */
1534 xs_close(xprt);
1535
1536 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1537 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1538 goto out;
1539 }
1540 xs_reclassify_socket6(sock);
1541
1542 if (xs_bind6(transport, sock) < 0) {
1543 sock_release(sock);
1544 goto out;
1545 }
1546
1547 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1548 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1549
1550 xs_udp_finish_connecting(xprt, sock);
1551 status = 0;
1552 out:
1553 xprt_wake_pending_tasks(xprt, status);
1554 xprt_clear_connecting(xprt);
1555 }
1556
1557 /*
1558 * We need to preserve the port number so the reply cache on the server can
1559 * find our cached RPC replies when we get around to reconnecting.
1560 */
1561 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1562 {
1563 int result;
1564 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1565 struct sockaddr any;
1566
1567 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1568
1569 /*
1570 * Disconnect the transport socket by doing a connect operation
1571 * with AF_UNSPEC. This should return immediately...
1572 */
1573 memset(&any, 0, sizeof(any));
1574 any.sa_family = AF_UNSPEC;
1575 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1576 if (result)
1577 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1578 result);
1579 }
1580
1581 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1582 {
1583 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1584
1585 if (!transport->inet) {
1586 struct sock *sk = sock->sk;
1587
1588 write_lock_bh(&sk->sk_callback_lock);
1589
1590 sk->sk_user_data = xprt;
1591 transport->old_data_ready = sk->sk_data_ready;
1592 transport->old_state_change = sk->sk_state_change;
1593 transport->old_write_space = sk->sk_write_space;
1594 sk->sk_data_ready = xs_tcp_data_ready;
1595 sk->sk_state_change = xs_tcp_state_change;
1596 sk->sk_write_space = xs_tcp_write_space;
1597 sk->sk_allocation = GFP_ATOMIC;
1598
1599 /* socket options */
1600 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1601 sock_reset_flag(sk, SOCK_LINGER);
1602 tcp_sk(sk)->linger2 = 0;
1603 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1604
1605 xprt_clear_connected(xprt);
1606
1607 /* Reset to new socket */
1608 transport->sock = sock;
1609 transport->inet = sk;
1610
1611 write_unlock_bh(&sk->sk_callback_lock);
1612 }
1613
1614 /* Tell the socket layer to start connecting... */
1615 xprt->stat.connect_count++;
1616 xprt->stat.connect_start = jiffies;
1617 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1618 }
1619
1620 /**
1621 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1622 * @work: RPC transport to connect
1623 *
1624 * Invoked by a work queue tasklet.
1625 */
1626 static void xs_tcp_connect_worker4(struct work_struct *work)
1627 {
1628 struct sock_xprt *transport =
1629 container_of(work, struct sock_xprt, connect_worker.work);
1630 struct rpc_xprt *xprt = &transport->xprt;
1631 struct socket *sock = transport->sock;
1632 int err, status = -EIO;
1633
1634 if (xprt->shutdown || !xprt_bound(xprt))
1635 goto out;
1636
1637 if (!sock) {
1638 /* start from scratch */
1639 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1640 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1641 goto out;
1642 }
1643 xs_reclassify_socket4(sock);
1644
1645 if (xs_bind4(transport, sock) < 0) {
1646 sock_release(sock);
1647 goto out;
1648 }
1649 } else
1650 /* "close" the socket, preserving the local port */
1651 xs_tcp_reuse_connection(xprt);
1652
1653 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1654 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1655
1656 status = xs_tcp_finish_connecting(xprt, sock);
1657 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1658 xprt, -status, xprt_connected(xprt),
1659 sock->sk->sk_state);
1660 if (status < 0) {
1661 switch (status) {
1662 case -EINPROGRESS:
1663 case -EALREADY:
1664 goto out_clear;
1665 case -ECONNREFUSED:
1666 case -ECONNRESET:
1667 /* retry with existing socket, after a delay */
1668 break;
1669 default:
1670 /* get rid of existing socket, and retry */
1671 xs_tcp_shutdown(xprt);
1672 }
1673 }
1674 out:
1675 xprt_wake_pending_tasks(xprt, status);
1676 out_clear:
1677 xprt_clear_connecting(xprt);
1678 }
1679
1680 /**
1681 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1682 * @work: RPC transport to connect
1683 *
1684 * Invoked by a work queue tasklet.
1685 */
1686 static void xs_tcp_connect_worker6(struct work_struct *work)
1687 {
1688 struct sock_xprt *transport =
1689 container_of(work, struct sock_xprt, connect_worker.work);
1690 struct rpc_xprt *xprt = &transport->xprt;
1691 struct socket *sock = transport->sock;
1692 int err, status = -EIO;
1693
1694 if (xprt->shutdown || !xprt_bound(xprt))
1695 goto out;
1696
1697 if (!sock) {
1698 /* start from scratch */
1699 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1700 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1701 goto out;
1702 }
1703 xs_reclassify_socket6(sock);
1704
1705 if (xs_bind6(transport, sock) < 0) {
1706 sock_release(sock);
1707 goto out;
1708 }
1709 } else
1710 /* "close" the socket, preserving the local port */
1711 xs_tcp_reuse_connection(xprt);
1712
1713 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1714 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1715
1716 status = xs_tcp_finish_connecting(xprt, sock);
1717 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1718 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1719 if (status < 0) {
1720 switch (status) {
1721 case -EINPROGRESS:
1722 case -EALREADY:
1723 goto out_clear;
1724 case -ECONNREFUSED:
1725 case -ECONNRESET:
1726 /* retry with existing socket, after a delay */
1727 break;
1728 default:
1729 /* get rid of existing socket, and retry */
1730 xs_tcp_shutdown(xprt);
1731 }
1732 }
1733 out:
1734 xprt_wake_pending_tasks(xprt, status);
1735 out_clear:
1736 xprt_clear_connecting(xprt);
1737 }
1738
1739 /**
1740 * xs_connect - connect a socket to a remote endpoint
1741 * @task: address of RPC task that manages state of connect request
1742 *
1743 * TCP: If the remote end dropped the connection, delay reconnecting.
1744 *
1745 * UDP socket connects are synchronous, but we use a work queue anyway
1746 * to guarantee that even unprivileged user processes can set up a
1747 * socket on a privileged port.
1748 *
1749 * If a UDP socket connect fails, the delay behavior here prevents
1750 * retry floods (hard mounts).
1751 */
1752 static void xs_connect(struct rpc_task *task)
1753 {
1754 struct rpc_xprt *xprt = task->tk_xprt;
1755 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1756
1757 if (xprt_test_and_set_connecting(xprt))
1758 return;
1759
1760 if (transport->sock != NULL) {
1761 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1762 "seconds\n",
1763 xprt, xprt->reestablish_timeout / HZ);
1764 queue_delayed_work(rpciod_workqueue,
1765 &transport->connect_worker,
1766 xprt->reestablish_timeout);
1767 xprt->reestablish_timeout <<= 1;
1768 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1769 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1770 } else {
1771 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1772 queue_delayed_work(rpciod_workqueue,
1773 &transport->connect_worker, 0);
1774 }
1775 }
1776
1777 static void xs_tcp_connect(struct rpc_task *task)
1778 {
1779 struct rpc_xprt *xprt = task->tk_xprt;
1780
1781 /* Initiate graceful shutdown of the socket if not already done */
1782 if (test_bit(XPRT_CONNECTED, &xprt->state))
1783 xs_tcp_shutdown(xprt);
1784 /* Exit if we need to wait for socket shutdown to complete */
1785 if (test_bit(XPRT_CLOSING, &xprt->state))
1786 return;
1787 xs_connect(task);
1788 }
1789
1790 /**
1791 * xs_udp_print_stats - display UDP socket-specifc stats
1792 * @xprt: rpc_xprt struct containing statistics
1793 * @seq: output file
1794 *
1795 */
1796 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1797 {
1798 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1799
1800 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1801 transport->port,
1802 xprt->stat.bind_count,
1803 xprt->stat.sends,
1804 xprt->stat.recvs,
1805 xprt->stat.bad_xids,
1806 xprt->stat.req_u,
1807 xprt->stat.bklog_u);
1808 }
1809
1810 /**
1811 * xs_tcp_print_stats - display TCP socket-specifc stats
1812 * @xprt: rpc_xprt struct containing statistics
1813 * @seq: output file
1814 *
1815 */
1816 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1817 {
1818 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1819 long idle_time = 0;
1820
1821 if (xprt_connected(xprt))
1822 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1823
1824 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1825 transport->port,
1826 xprt->stat.bind_count,
1827 xprt->stat.connect_count,
1828 xprt->stat.connect_time,
1829 idle_time,
1830 xprt->stat.sends,
1831 xprt->stat.recvs,
1832 xprt->stat.bad_xids,
1833 xprt->stat.req_u,
1834 xprt->stat.bklog_u);
1835 }
1836
1837 static struct rpc_xprt_ops xs_udp_ops = {
1838 .set_buffer_size = xs_udp_set_buffer_size,
1839 .reserve_xprt = xprt_reserve_xprt_cong,
1840 .release_xprt = xprt_release_xprt_cong,
1841 .rpcbind = rpcb_getport_async,
1842 .set_port = xs_set_port,
1843 .connect = xs_connect,
1844 .buf_alloc = rpc_malloc,
1845 .buf_free = rpc_free,
1846 .send_request = xs_udp_send_request,
1847 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1848 .timer = xs_udp_timer,
1849 .release_request = xprt_release_rqst_cong,
1850 .close = xs_close,
1851 .destroy = xs_destroy,
1852 .print_stats = xs_udp_print_stats,
1853 };
1854
1855 static struct rpc_xprt_ops xs_tcp_ops = {
1856 .reserve_xprt = xprt_reserve_xprt,
1857 .release_xprt = xs_tcp_release_xprt,
1858 .rpcbind = rpcb_getport_async,
1859 .set_port = xs_set_port,
1860 .connect = xs_tcp_connect,
1861 .buf_alloc = rpc_malloc,
1862 .buf_free = rpc_free,
1863 .send_request = xs_tcp_send_request,
1864 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1865 .close = xs_tcp_shutdown,
1866 .destroy = xs_destroy,
1867 .print_stats = xs_tcp_print_stats,
1868 };
1869
1870 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1871 unsigned int slot_table_size)
1872 {
1873 struct rpc_xprt *xprt;
1874 struct sock_xprt *new;
1875
1876 if (args->addrlen > sizeof(xprt->addr)) {
1877 dprintk("RPC: xs_setup_xprt: address too large\n");
1878 return ERR_PTR(-EBADF);
1879 }
1880
1881 new = kzalloc(sizeof(*new), GFP_KERNEL);
1882 if (new == NULL) {
1883 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1884 "rpc_xprt\n");
1885 return ERR_PTR(-ENOMEM);
1886 }
1887 xprt = &new->xprt;
1888
1889 xprt->max_reqs = slot_table_size;
1890 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1891 if (xprt->slot == NULL) {
1892 kfree(xprt);
1893 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1894 "table\n");
1895 return ERR_PTR(-ENOMEM);
1896 }
1897
1898 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1899 xprt->addrlen = args->addrlen;
1900 if (args->srcaddr)
1901 memcpy(&new->addr, args->srcaddr, args->addrlen);
1902
1903 return xprt;
1904 }
1905
1906 static const struct rpc_timeout xs_udp_default_timeout = {
1907 .to_initval = 5 * HZ,
1908 .to_maxval = 30 * HZ,
1909 .to_increment = 5 * HZ,
1910 .to_retries = 5,
1911 };
1912
1913 /**
1914 * xs_setup_udp - Set up transport to use a UDP socket
1915 * @args: rpc transport creation arguments
1916 *
1917 */
1918 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1919 {
1920 struct sockaddr *addr = args->dstaddr;
1921 struct rpc_xprt *xprt;
1922 struct sock_xprt *transport;
1923
1924 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1925 if (IS_ERR(xprt))
1926 return xprt;
1927 transport = container_of(xprt, struct sock_xprt, xprt);
1928
1929 xprt->prot = IPPROTO_UDP;
1930 xprt->tsh_size = 0;
1931 /* XXX: header size can vary due to auth type, IPv6, etc. */
1932 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1933
1934 xprt->bind_timeout = XS_BIND_TO;
1935 xprt->connect_timeout = XS_UDP_CONN_TO;
1936 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1937 xprt->idle_timeout = XS_IDLE_DISC_TO;
1938
1939 xprt->ops = &xs_udp_ops;
1940
1941 xprt->timeout = &xs_udp_default_timeout;
1942
1943 switch (addr->sa_family) {
1944 case AF_INET:
1945 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1946 xprt_set_bound(xprt);
1947
1948 INIT_DELAYED_WORK(&transport->connect_worker,
1949 xs_udp_connect_worker4);
1950 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1951 break;
1952 case AF_INET6:
1953 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1954 xprt_set_bound(xprt);
1955
1956 INIT_DELAYED_WORK(&transport->connect_worker,
1957 xs_udp_connect_worker6);
1958 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1959 break;
1960 default:
1961 kfree(xprt);
1962 return ERR_PTR(-EAFNOSUPPORT);
1963 }
1964
1965 dprintk("RPC: set up transport to address %s\n",
1966 xprt->address_strings[RPC_DISPLAY_ALL]);
1967
1968 if (try_module_get(THIS_MODULE))
1969 return xprt;
1970
1971 kfree(xprt->slot);
1972 kfree(xprt);
1973 return ERR_PTR(-EINVAL);
1974 }
1975
1976 static const struct rpc_timeout xs_tcp_default_timeout = {
1977 .to_initval = 60 * HZ,
1978 .to_maxval = 60 * HZ,
1979 .to_retries = 2,
1980 };
1981
1982 /**
1983 * xs_setup_tcp - Set up transport to use a TCP socket
1984 * @args: rpc transport creation arguments
1985 *
1986 */
1987 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1988 {
1989 struct sockaddr *addr = args->dstaddr;
1990 struct rpc_xprt *xprt;
1991 struct sock_xprt *transport;
1992
1993 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1994 if (IS_ERR(xprt))
1995 return xprt;
1996 transport = container_of(xprt, struct sock_xprt, xprt);
1997
1998 xprt->prot = IPPROTO_TCP;
1999 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2000 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2001
2002 xprt->bind_timeout = XS_BIND_TO;
2003 xprt->connect_timeout = XS_TCP_CONN_TO;
2004 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2005 xprt->idle_timeout = XS_IDLE_DISC_TO;
2006
2007 xprt->ops = &xs_tcp_ops;
2008 xprt->timeout = &xs_tcp_default_timeout;
2009
2010 switch (addr->sa_family) {
2011 case AF_INET:
2012 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2013 xprt_set_bound(xprt);
2014
2015 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2016 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2017 break;
2018 case AF_INET6:
2019 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2020 xprt_set_bound(xprt);
2021
2022 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2023 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2024 break;
2025 default:
2026 kfree(xprt);
2027 return ERR_PTR(-EAFNOSUPPORT);
2028 }
2029
2030 dprintk("RPC: set up transport to address %s\n",
2031 xprt->address_strings[RPC_DISPLAY_ALL]);
2032
2033 if (try_module_get(THIS_MODULE))
2034 return xprt;
2035
2036 kfree(xprt->slot);
2037 kfree(xprt);
2038 return ERR_PTR(-EINVAL);
2039 }
2040
2041 static struct xprt_class xs_udp_transport = {
2042 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2043 .name = "udp",
2044 .owner = THIS_MODULE,
2045 .ident = IPPROTO_UDP,
2046 .setup = xs_setup_udp,
2047 };
2048
2049 static struct xprt_class xs_tcp_transport = {
2050 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2051 .name = "tcp",
2052 .owner = THIS_MODULE,
2053 .ident = IPPROTO_TCP,
2054 .setup = xs_setup_tcp,
2055 };
2056
2057 /**
2058 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2059 *
2060 */
2061 int init_socket_xprt(void)
2062 {
2063 #ifdef RPC_DEBUG
2064 if (!sunrpc_table_header)
2065 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2066 #endif
2067
2068 xprt_register_transport(&xs_udp_transport);
2069 xprt_register_transport(&xs_tcp_transport);
2070
2071 return 0;
2072 }
2073
2074 /**
2075 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2076 *
2077 */
2078 void cleanup_socket_xprt(void)
2079 {
2080 #ifdef RPC_DEBUG
2081 if (sunrpc_table_header) {
2082 unregister_sysctl_table(sunrpc_table_header);
2083 sunrpc_table_header = NULL;
2084 }
2085 #endif
2086
2087 xprt_unregister_transport(&xs_udp_transport);
2088 xprt_unregister_transport(&xs_tcp_transport);
2089 }
Linux kernel - Deliverables
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