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New locking/refcounting for fs_struct
[linux-2.6.git] / net / sunrpc / xprtsock.c
blob568330eebbfeb68e469ead8f23f8f059093850b4
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 void (*old_error_report)(struct sock *);
253 };
254
255 /*
256 * TCP receive state flags
257 */
258 #define TCP_RCV_LAST_FRAG (1UL << 0)
259 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
260 #define TCP_RCV_COPY_XID (1UL << 2)
261 #define TCP_RCV_COPY_DATA (1UL << 3)
262
263 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
264 {
265 return (struct sockaddr *) &xprt->addr;
266 }
267
268 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
269 {
270 return (struct sockaddr_in *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
274 {
275 return (struct sockaddr_in6 *) &xprt->addr;
276 }
277
278 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
279 const char *protocol,
280 const char *netid)
281 {
282 struct sockaddr_in *addr = xs_addr_in(xprt);
283 char *buf;
284
285 buf = kzalloc(20, GFP_KERNEL);
286 if (buf) {
287 snprintf(buf, 20, "%pI4", &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=%pI4 port=%u proto=%s",
303 &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, "%pI4.%u.%u",
326 &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 -ENOTSOCK;
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 if (!xprt_bound(xprt))
581 return -ENOTCONN;
582 status = xs_sendpages(transport->sock,
583 xs_addr(xprt),
584 xprt->addrlen, xdr,
585 req->rq_bytes_sent);
586
587 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
588 xdr->len - req->rq_bytes_sent, status);
589
590 if (status >= 0) {
591 task->tk_bytes_sent += status;
592 if (status >= req->rq_slen)
593 return 0;
594 /* Still some bytes left; set up for a retry later. */
595 status = -EAGAIN;
596 }
597
598 switch (status) {
599 case -ENOTSOCK:
600 status = -ENOTCONN;
601 /* Should we call xs_close() here? */
602 break;
603 case -EAGAIN:
604 xs_nospace(task);
605 break;
606 case -ENETUNREACH:
607 case -EPIPE:
608 case -ECONNREFUSED:
609 /* When the server has died, an ICMP port unreachable message
610 * prompts ECONNREFUSED. */
611 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
612 break;
613 default:
614 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
615 dprintk("RPC: sendmsg returned unrecognized error %d\n",
616 -status);
617 }
618
619 return status;
620 }
621
622 /**
623 * xs_tcp_shutdown - gracefully shut down a TCP socket
624 * @xprt: transport
625 *
626 * Initiates a graceful shutdown of the TCP socket by calling the
627 * equivalent of shutdown(SHUT_WR);
628 */
629 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
630 {
631 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
632 struct socket *sock = transport->sock;
633
634 if (sock != NULL)
635 kernel_sock_shutdown(sock, SHUT_WR);
636 }
637
638 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
639 {
640 u32 reclen = buf->len - sizeof(rpc_fraghdr);
641 rpc_fraghdr *base = buf->head[0].iov_base;
642 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
643 }
644
645 /**
646 * xs_tcp_send_request - write an RPC request to a TCP socket
647 * @task: address of RPC task that manages the state of an RPC request
648 *
649 * Return values:
650 * 0: The request has been sent
651 * EAGAIN: The socket was blocked, please call again later to
652 * complete the request
653 * ENOTCONN: Caller needs to invoke connect logic then call again
654 * other: Some other error occured, the request was not sent
655 *
656 * XXX: In the case of soft timeouts, should we eventually give up
657 * if sendmsg is not able to make progress?
658 */
659 static int xs_tcp_send_request(struct rpc_task *task)
660 {
661 struct rpc_rqst *req = task->tk_rqstp;
662 struct rpc_xprt *xprt = req->rq_xprt;
663 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
664 struct xdr_buf *xdr = &req->rq_snd_buf;
665 int status;
666
667 xs_encode_tcp_record_marker(&req->rq_snd_buf);
668
669 xs_pktdump("packet data:",
670 req->rq_svec->iov_base,
671 req->rq_svec->iov_len);
672
673 /* Continue transmitting the packet/record. We must be careful
674 * to cope with writespace callbacks arriving _after_ we have
675 * called sendmsg(). */
676 while (1) {
677 status = xs_sendpages(transport->sock,
678 NULL, 0, xdr, req->rq_bytes_sent);
679
680 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
681 xdr->len - req->rq_bytes_sent, status);
682
683 if (unlikely(status < 0))
684 break;
685
686 /* If we've sent the entire packet, immediately
687 * reset the count of bytes sent. */
688 req->rq_bytes_sent += status;
689 task->tk_bytes_sent += status;
690 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
691 req->rq_bytes_sent = 0;
692 return 0;
693 }
694
695 if (status != 0)
696 continue;
697 status = -EAGAIN;
698 break;
699 }
700
701 switch (status) {
702 case -ENOTSOCK:
703 status = -ENOTCONN;
704 /* Should we call xs_close() here? */
705 break;
706 case -EAGAIN:
707 xs_nospace(task);
708 break;
709 case -ECONNRESET:
710 xs_tcp_shutdown(xprt);
711 case -ECONNREFUSED:
712 case -ENOTCONN:
713 case -EPIPE:
714 status = -ENOTCONN;
715 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
716 break;
717 default:
718 dprintk("RPC: sendmsg returned unrecognized error %d\n",
719 -status);
720 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
721 xs_tcp_shutdown(xprt);
722 }
723
724 return status;
725 }
726
727 /**
728 * xs_tcp_release_xprt - clean up after a tcp transmission
729 * @xprt: transport
730 * @task: rpc task
731 *
732 * This cleans up if an error causes us to abort the transmission of a request.
733 * In this case, the socket may need to be reset in order to avoid confusing
734 * the server.
735 */
736 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
737 {
738 struct rpc_rqst *req;
739
740 if (task != xprt->snd_task)
741 return;
742 if (task == NULL)
743 goto out_release;
744 req = task->tk_rqstp;
745 if (req->rq_bytes_sent == 0)
746 goto out_release;
747 if (req->rq_bytes_sent == req->rq_snd_buf.len)
748 goto out_release;
749 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
750 out_release:
751 xprt_release_xprt(xprt, task);
752 }
753
754 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
755 {
756 transport->old_data_ready = sk->sk_data_ready;
757 transport->old_state_change = sk->sk_state_change;
758 transport->old_write_space = sk->sk_write_space;
759 transport->old_error_report = sk->sk_error_report;
760 }
761
762 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
763 {
764 sk->sk_data_ready = transport->old_data_ready;
765 sk->sk_state_change = transport->old_state_change;
766 sk->sk_write_space = transport->old_write_space;
767 sk->sk_error_report = transport->old_error_report;
768 }
769
770 /**
771 * xs_close - close a socket
772 * @xprt: transport
773 *
774 * This is used when all requests are complete; ie, no DRC state remains
775 * on the server we want to save.
776 */
777 static void xs_close(struct rpc_xprt *xprt)
778 {
779 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
780 struct socket *sock = transport->sock;
781 struct sock *sk = transport->inet;
782
783 if (!sk)
784 goto clear_close_wait;
785
786 dprintk("RPC: xs_close xprt %p\n", xprt);
787
788 write_lock_bh(&sk->sk_callback_lock);
789 transport->inet = NULL;
790 transport->sock = NULL;
791
792 sk->sk_user_data = NULL;
793
794 xs_restore_old_callbacks(transport, sk);
795 write_unlock_bh(&sk->sk_callback_lock);
796
797 sk->sk_no_check = 0;
798
799 sock_release(sock);
800 clear_close_wait:
801 smp_mb__before_clear_bit();
802 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
803 clear_bit(XPRT_CLOSING, &xprt->state);
804 smp_mb__after_clear_bit();
805 xprt_disconnect_done(xprt);
806 }
807
808 /**
809 * xs_destroy - prepare to shutdown a transport
810 * @xprt: doomed transport
811 *
812 */
813 static void xs_destroy(struct rpc_xprt *xprt)
814 {
815 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
816
817 dprintk("RPC: xs_destroy xprt %p\n", xprt);
818
819 cancel_rearming_delayed_work(&transport->connect_worker);
820
821 xs_close(xprt);
822 xs_free_peer_addresses(xprt);
823 kfree(xprt->slot);
824 kfree(xprt);
825 module_put(THIS_MODULE);
826 }
827
828 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
829 {
830 return (struct rpc_xprt *) sk->sk_user_data;
831 }
832
833 /**
834 * xs_udp_data_ready - "data ready" callback for UDP sockets
835 * @sk: socket with data to read
836 * @len: how much data to read
837 *
838 */
839 static void xs_udp_data_ready(struct sock *sk, int len)
840 {
841 struct rpc_task *task;
842 struct rpc_xprt *xprt;
843 struct rpc_rqst *rovr;
844 struct sk_buff *skb;
845 int err, repsize, copied;
846 u32 _xid;
847 __be32 *xp;
848
849 read_lock(&sk->sk_callback_lock);
850 dprintk("RPC: xs_udp_data_ready...\n");
851 if (!(xprt = xprt_from_sock(sk)))
852 goto out;
853
854 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
855 goto out;
856
857 if (xprt->shutdown)
858 goto dropit;
859
860 repsize = skb->len - sizeof(struct udphdr);
861 if (repsize < 4) {
862 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
863 goto dropit;
864 }
865
866 /* Copy the XID from the skb... */
867 xp = skb_header_pointer(skb, sizeof(struct udphdr),
868 sizeof(_xid), &_xid);
869 if (xp == NULL)
870 goto dropit;
871
872 /* Look up and lock the request corresponding to the given XID */
873 spin_lock(&xprt->transport_lock);
874 rovr = xprt_lookup_rqst(xprt, *xp);
875 if (!rovr)
876 goto out_unlock;
877 task = rovr->rq_task;
878
879 if ((copied = rovr->rq_private_buf.buflen) > repsize)
880 copied = repsize;
881
882 /* Suck it into the iovec, verify checksum if not done by hw. */
883 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
884 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
885 goto out_unlock;
886 }
887
888 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
889
890 /* Something worked... */
891 dst_confirm(skb->dst);
892
893 xprt_adjust_cwnd(task, copied);
894 xprt_update_rtt(task);
895 xprt_complete_rqst(task, copied);
896
897 out_unlock:
898 spin_unlock(&xprt->transport_lock);
899 dropit:
900 skb_free_datagram(sk, skb);
901 out:
902 read_unlock(&sk->sk_callback_lock);
903 }
904
905 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
906 {
907 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
908 size_t len, used;
909 char *p;
910
911 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
912 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
913 used = xdr_skb_read_bits(desc, p, len);
914 transport->tcp_offset += used;
915 if (used != len)
916 return;
917
918 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
919 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
920 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
921 else
922 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
923 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
924
925 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
926 transport->tcp_offset = 0;
927
928 /* Sanity check of the record length */
929 if (unlikely(transport->tcp_reclen < 4)) {
930 dprintk("RPC: invalid TCP record fragment length\n");
931 xprt_force_disconnect(xprt);
932 return;
933 }
934 dprintk("RPC: reading TCP record fragment of length %d\n",
935 transport->tcp_reclen);
936 }
937
938 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
939 {
940 if (transport->tcp_offset == transport->tcp_reclen) {
941 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
942 transport->tcp_offset = 0;
943 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
944 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
945 transport->tcp_flags |= TCP_RCV_COPY_XID;
946 transport->tcp_copied = 0;
947 }
948 }
949 }
950
951 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
952 {
953 size_t len, used;
954 char *p;
955
956 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
957 dprintk("RPC: reading XID (%Zu bytes)\n", len);
958 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
959 used = xdr_skb_read_bits(desc, p, len);
960 transport->tcp_offset += used;
961 if (used != len)
962 return;
963 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
964 transport->tcp_flags |= TCP_RCV_COPY_DATA;
965 transport->tcp_copied = 4;
966 dprintk("RPC: reading reply for XID %08x\n",
967 ntohl(transport->tcp_xid));
968 xs_tcp_check_fraghdr(transport);
969 }
970
971 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
972 {
973 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
974 struct rpc_rqst *req;
975 struct xdr_buf *rcvbuf;
976 size_t len;
977 ssize_t r;
978
979 /* Find and lock the request corresponding to this xid */
980 spin_lock(&xprt->transport_lock);
981 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
982 if (!req) {
983 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
984 dprintk("RPC: XID %08x request not found!\n",
985 ntohl(transport->tcp_xid));
986 spin_unlock(&xprt->transport_lock);
987 return;
988 }
989
990 rcvbuf = &req->rq_private_buf;
991 len = desc->count;
992 if (len > transport->tcp_reclen - transport->tcp_offset) {
993 struct xdr_skb_reader my_desc;
994
995 len = transport->tcp_reclen - transport->tcp_offset;
996 memcpy(&my_desc, desc, sizeof(my_desc));
997 my_desc.count = len;
998 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
999 &my_desc, xdr_skb_read_bits);
1000 desc->count -= r;
1001 desc->offset += r;
1002 } else
1003 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1004 desc, xdr_skb_read_bits);
1005
1006 if (r > 0) {
1007 transport->tcp_copied += r;
1008 transport->tcp_offset += r;
1009 }
1010 if (r != len) {
1011 /* Error when copying to the receive buffer,
1012 * usually because we weren't able to allocate
1013 * additional buffer pages. All we can do now
1014 * is turn off TCP_RCV_COPY_DATA, so the request
1015 * will not receive any additional updates,
1016 * and time out.
1017 * Any remaining data from this record will
1018 * be discarded.
1019 */
1020 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1021 dprintk("RPC: XID %08x truncated request\n",
1022 ntohl(transport->tcp_xid));
1023 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1024 "tcp_offset = %u, tcp_reclen = %u\n",
1025 xprt, transport->tcp_copied,
1026 transport->tcp_offset, transport->tcp_reclen);
1027 goto out;
1028 }
1029
1030 dprintk("RPC: XID %08x read %Zd bytes\n",
1031 ntohl(transport->tcp_xid), r);
1032 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1033 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1034 transport->tcp_offset, transport->tcp_reclen);
1035
1036 if (transport->tcp_copied == req->rq_private_buf.buflen)
1037 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1038 else if (transport->tcp_offset == transport->tcp_reclen) {
1039 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1040 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1041 }
1042
1043 out:
1044 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1045 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1046 spin_unlock(&xprt->transport_lock);
1047 xs_tcp_check_fraghdr(transport);
1048 }
1049
1050 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1051 {
1052 size_t len;
1053
1054 len = transport->tcp_reclen - transport->tcp_offset;
1055 if (len > desc->count)
1056 len = desc->count;
1057 desc->count -= len;
1058 desc->offset += len;
1059 transport->tcp_offset += len;
1060 dprintk("RPC: discarded %Zu bytes\n", len);
1061 xs_tcp_check_fraghdr(transport);
1062 }
1063
1064 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1065 {
1066 struct rpc_xprt *xprt = rd_desc->arg.data;
1067 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1068 struct xdr_skb_reader desc = {
1069 .skb = skb,
1070 .offset = offset,
1071 .count = len,
1072 };
1073
1074 dprintk("RPC: xs_tcp_data_recv started\n");
1075 do {
1076 /* Read in a new fragment marker if necessary */
1077 /* Can we ever really expect to get completely empty fragments? */
1078 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1079 xs_tcp_read_fraghdr(xprt, &desc);
1080 continue;
1081 }
1082 /* Read in the xid if necessary */
1083 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1084 xs_tcp_read_xid(transport, &desc);
1085 continue;
1086 }
1087 /* Read in the request data */
1088 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1089 xs_tcp_read_request(xprt, &desc);
1090 continue;
1091 }
1092 /* Skip over any trailing bytes on short reads */
1093 xs_tcp_read_discard(transport, &desc);
1094 } while (desc.count);
1095 dprintk("RPC: xs_tcp_data_recv done\n");
1096 return len - desc.count;
1097 }
1098
1099 /**
1100 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1101 * @sk: socket with data to read
1102 * @bytes: how much data to read
1103 *
1104 */
1105 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1106 {
1107 struct rpc_xprt *xprt;
1108 read_descriptor_t rd_desc;
1109 int read;
1110
1111 dprintk("RPC: xs_tcp_data_ready...\n");
1112
1113 read_lock(&sk->sk_callback_lock);
1114 if (!(xprt = xprt_from_sock(sk)))
1115 goto out;
1116 if (xprt->shutdown)
1117 goto out;
1118
1119 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1120 rd_desc.arg.data = xprt;
1121 do {
1122 rd_desc.count = 65536;
1123 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1124 } while (read > 0);
1125 out:
1126 read_unlock(&sk->sk_callback_lock);
1127 }
1128
1129 /**
1130 * xs_tcp_state_change - callback to handle TCP socket state changes
1131 * @sk: socket whose state has changed
1132 *
1133 */
1134 static void xs_tcp_state_change(struct sock *sk)
1135 {
1136 struct rpc_xprt *xprt;
1137
1138 read_lock(&sk->sk_callback_lock);
1139 if (!(xprt = xprt_from_sock(sk)))
1140 goto out;
1141 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1142 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1143 sk->sk_state, xprt_connected(xprt),
1144 sock_flag(sk, SOCK_DEAD),
1145 sock_flag(sk, SOCK_ZAPPED));
1146
1147 switch (sk->sk_state) {
1148 case TCP_ESTABLISHED:
1149 spin_lock_bh(&xprt->transport_lock);
1150 if (!xprt_test_and_set_connected(xprt)) {
1151 struct sock_xprt *transport = container_of(xprt,
1152 struct sock_xprt, xprt);
1153
1154 /* Reset TCP record info */
1155 transport->tcp_offset = 0;
1156 transport->tcp_reclen = 0;
1157 transport->tcp_copied = 0;
1158 transport->tcp_flags =
1159 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1160
1161 xprt_wake_pending_tasks(xprt, 0);
1162 }
1163 spin_unlock_bh(&xprt->transport_lock);
1164 break;
1165 case TCP_FIN_WAIT1:
1166 /* The client initiated a shutdown of the socket */
1167 xprt->connect_cookie++;
1168 xprt->reestablish_timeout = 0;
1169 set_bit(XPRT_CLOSING, &xprt->state);
1170 smp_mb__before_clear_bit();
1171 clear_bit(XPRT_CONNECTED, &xprt->state);
1172 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1173 smp_mb__after_clear_bit();
1174 break;
1175 case TCP_CLOSE_WAIT:
1176 /* The server initiated a shutdown of the socket */
1177 set_bit(XPRT_CLOSING, &xprt->state);
1178 xprt_force_disconnect(xprt);
1179 case TCP_SYN_SENT:
1180 xprt->connect_cookie++;
1181 case TCP_CLOSING:
1182 /*
1183 * If the server closed down the connection, make sure that
1184 * we back off before reconnecting
1185 */
1186 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1187 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1188 break;
1189 case TCP_LAST_ACK:
1190 smp_mb__before_clear_bit();
1191 clear_bit(XPRT_CONNECTED, &xprt->state);
1192 smp_mb__after_clear_bit();
1193 break;
1194 case TCP_CLOSE:
1195 smp_mb__before_clear_bit();
1196 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1197 clear_bit(XPRT_CLOSING, &xprt->state);
1198 smp_mb__after_clear_bit();
1199 /* Mark transport as closed and wake up all pending tasks */
1200 xprt_disconnect_done(xprt);
1201 }
1202 out:
1203 read_unlock(&sk->sk_callback_lock);
1204 }
1205
1206 /**
1207 * xs_tcp_error_report - callback mainly for catching RST events
1208 * @sk: socket
1209 */
1210 static void xs_tcp_error_report(struct sock *sk)
1211 {
1212 struct rpc_xprt *xprt;
1213
1214 read_lock(&sk->sk_callback_lock);
1215 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1216 goto out;
1217 if (!(xprt = xprt_from_sock(sk)))
1218 goto out;
1219 dprintk("RPC: %s client %p...\n"
1220 "RPC: error %d\n",
1221 __func__, xprt, sk->sk_err);
1222
1223 xprt_force_disconnect(xprt);
1224 out:
1225 read_unlock(&sk->sk_callback_lock);
1226 }
1227
1228 static void xs_write_space(struct sock *sk)
1229 {
1230 struct socket *sock;
1231 struct rpc_xprt *xprt;
1232
1233 if (unlikely(!(sock = sk->sk_socket)))
1234 return;
1235 clear_bit(SOCK_NOSPACE, &sock->flags);
1236
1237 if (unlikely(!(xprt = xprt_from_sock(sk))))
1238 return;
1239 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1240 return;
1241
1242 xprt_write_space(xprt);
1243 }
1244
1245 /**
1246 * xs_udp_write_space - callback invoked when socket buffer space
1247 * becomes available
1248 * @sk: socket whose state has changed
1249 *
1250 * Called when more output buffer space is available for this socket.
1251 * We try not to wake our writers until they can make "significant"
1252 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1253 * with a bunch of small requests.
1254 */
1255 static void xs_udp_write_space(struct sock *sk)
1256 {
1257 read_lock(&sk->sk_callback_lock);
1258
1259 /* from net/core/sock.c:sock_def_write_space */
1260 if (sock_writeable(sk))
1261 xs_write_space(sk);
1262
1263 read_unlock(&sk->sk_callback_lock);
1264 }
1265
1266 /**
1267 * xs_tcp_write_space - callback invoked when socket buffer space
1268 * becomes available
1269 * @sk: socket whose state has changed
1270 *
1271 * Called when more output buffer space is available for this socket.
1272 * We try not to wake our writers until they can make "significant"
1273 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1274 * with a bunch of small requests.
1275 */
1276 static void xs_tcp_write_space(struct sock *sk)
1277 {
1278 read_lock(&sk->sk_callback_lock);
1279
1280 /* from net/core/stream.c:sk_stream_write_space */
1281 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1282 xs_write_space(sk);
1283
1284 read_unlock(&sk->sk_callback_lock);
1285 }
1286
1287 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1288 {
1289 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1290 struct sock *sk = transport->inet;
1291
1292 if (transport->rcvsize) {
1293 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1294 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1295 }
1296 if (transport->sndsize) {
1297 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1298 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1299 sk->sk_write_space(sk);
1300 }
1301 }
1302
1303 /**
1304 * xs_udp_set_buffer_size - set send and receive limits
1305 * @xprt: generic transport
1306 * @sndsize: requested size of send buffer, in bytes
1307 * @rcvsize: requested size of receive buffer, in bytes
1308 *
1309 * Set socket send and receive buffer size limits.
1310 */
1311 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1312 {
1313 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1314
1315 transport->sndsize = 0;
1316 if (sndsize)
1317 transport->sndsize = sndsize + 1024;
1318 transport->rcvsize = 0;
1319 if (rcvsize)
1320 transport->rcvsize = rcvsize + 1024;
1321
1322 xs_udp_do_set_buffer_size(xprt);
1323 }
1324
1325 /**
1326 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1327 * @task: task that timed out
1328 *
1329 * Adjust the congestion window after a retransmit timeout has occurred.
1330 */
1331 static void xs_udp_timer(struct rpc_task *task)
1332 {
1333 xprt_adjust_cwnd(task, -ETIMEDOUT);
1334 }
1335
1336 static unsigned short xs_get_random_port(void)
1337 {
1338 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1339 unsigned short rand = (unsigned short) net_random() % range;
1340 return rand + xprt_min_resvport;
1341 }
1342
1343 /**
1344 * xs_set_port - reset the port number in the remote endpoint address
1345 * @xprt: generic transport
1346 * @port: new port number
1347 *
1348 */
1349 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1350 {
1351 struct sockaddr *addr = xs_addr(xprt);
1352
1353 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1354
1355 switch (addr->sa_family) {
1356 case AF_INET:
1357 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1358 break;
1359 case AF_INET6:
1360 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1361 break;
1362 default:
1363 BUG();
1364 }
1365 }
1366
1367 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1368 {
1369 unsigned short port = transport->port;
1370
1371 if (port == 0 && transport->xprt.resvport)
1372 port = xs_get_random_port();
1373 return port;
1374 }
1375
1376 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1377 {
1378 if (transport->port != 0)
1379 transport->port = 0;
1380 if (!transport->xprt.resvport)
1381 return 0;
1382 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1383 return xprt_max_resvport;
1384 return --port;
1385 }
1386
1387 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1388 {
1389 struct sockaddr_in myaddr = {
1390 .sin_family = AF_INET,
1391 };
1392 struct sockaddr_in *sa;
1393 int err, nloop = 0;
1394 unsigned short port = xs_get_srcport(transport, sock);
1395 unsigned short last;
1396
1397 sa = (struct sockaddr_in *)&transport->addr;
1398 myaddr.sin_addr = sa->sin_addr;
1399 do {
1400 myaddr.sin_port = htons(port);
1401 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1402 sizeof(myaddr));
1403 if (port == 0)
1404 break;
1405 if (err == 0) {
1406 transport->port = port;
1407 break;
1408 }
1409 last = port;
1410 port = xs_next_srcport(transport, sock, port);
1411 if (port > last)
1412 nloop++;
1413 } while (err == -EADDRINUSE && nloop != 2);
1414 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1415 __func__, &myaddr.sin_addr,
1416 port, err ? "failed" : "ok", err);
1417 return err;
1418 }
1419
1420 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1421 {
1422 struct sockaddr_in6 myaddr = {
1423 .sin6_family = AF_INET6,
1424 };
1425 struct sockaddr_in6 *sa;
1426 int err, nloop = 0;
1427 unsigned short port = xs_get_srcport(transport, sock);
1428 unsigned short last;
1429
1430 sa = (struct sockaddr_in6 *)&transport->addr;
1431 myaddr.sin6_addr = sa->sin6_addr;
1432 do {
1433 myaddr.sin6_port = htons(port);
1434 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1435 sizeof(myaddr));
1436 if (port == 0)
1437 break;
1438 if (err == 0) {
1439 transport->port = port;
1440 break;
1441 }
1442 last = port;
1443 port = xs_next_srcport(transport, sock, port);
1444 if (port > last)
1445 nloop++;
1446 } while (err == -EADDRINUSE && nloop != 2);
1447 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1448 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1449 return err;
1450 }
1451
1452 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1453 static struct lock_class_key xs_key[2];
1454 static struct lock_class_key xs_slock_key[2];
1455
1456 static inline void xs_reclassify_socket4(struct socket *sock)
1457 {
1458 struct sock *sk = sock->sk;
1459
1460 BUG_ON(sock_owned_by_user(sk));
1461 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1462 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1463 }
1464
1465 static inline void xs_reclassify_socket6(struct socket *sock)
1466 {
1467 struct sock *sk = sock->sk;
1468
1469 BUG_ON(sock_owned_by_user(sk));
1470 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1471 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1472 }
1473 #else
1474 static inline void xs_reclassify_socket4(struct socket *sock)
1475 {
1476 }
1477
1478 static inline void xs_reclassify_socket6(struct socket *sock)
1479 {
1480 }
1481 #endif
1482
1483 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1484 {
1485 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1486
1487 if (!transport->inet) {
1488 struct sock *sk = sock->sk;
1489
1490 write_lock_bh(&sk->sk_callback_lock);
1491
1492 xs_save_old_callbacks(transport, sk);
1493
1494 sk->sk_user_data = xprt;
1495 sk->sk_data_ready = xs_udp_data_ready;
1496 sk->sk_write_space = xs_udp_write_space;
1497 sk->sk_no_check = UDP_CSUM_NORCV;
1498 sk->sk_allocation = GFP_ATOMIC;
1499
1500 xprt_set_connected(xprt);
1501
1502 /* Reset to new socket */
1503 transport->sock = sock;
1504 transport->inet = sk;
1505
1506 write_unlock_bh(&sk->sk_callback_lock);
1507 }
1508 xs_udp_do_set_buffer_size(xprt);
1509 }
1510
1511 /**
1512 * xs_udp_connect_worker4 - set up a UDP socket
1513 * @work: RPC transport to connect
1514 *
1515 * Invoked by a work queue tasklet.
1516 */
1517 static void xs_udp_connect_worker4(struct work_struct *work)
1518 {
1519 struct sock_xprt *transport =
1520 container_of(work, struct sock_xprt, connect_worker.work);
1521 struct rpc_xprt *xprt = &transport->xprt;
1522 struct socket *sock = transport->sock;
1523 int err, status = -EIO;
1524
1525 if (xprt->shutdown)
1526 goto out;
1527
1528 /* Start by resetting any existing state */
1529 xs_close(xprt);
1530
1531 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1532 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1533 goto out;
1534 }
1535 xs_reclassify_socket4(sock);
1536
1537 if (xs_bind4(transport, sock)) {
1538 sock_release(sock);
1539 goto out;
1540 }
1541
1542 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1543 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1544
1545 xs_udp_finish_connecting(xprt, sock);
1546 status = 0;
1547 out:
1548 xprt_wake_pending_tasks(xprt, status);
1549 xprt_clear_connecting(xprt);
1550 }
1551
1552 /**
1553 * xs_udp_connect_worker6 - set up a UDP socket
1554 * @work: RPC transport to connect
1555 *
1556 * Invoked by a work queue tasklet.
1557 */
1558 static void xs_udp_connect_worker6(struct work_struct *work)
1559 {
1560 struct sock_xprt *transport =
1561 container_of(work, struct sock_xprt, connect_worker.work);
1562 struct rpc_xprt *xprt = &transport->xprt;
1563 struct socket *sock = transport->sock;
1564 int err, status = -EIO;
1565
1566 if (xprt->shutdown)
1567 goto out;
1568
1569 /* Start by resetting any existing state */
1570 xs_close(xprt);
1571
1572 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1573 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1574 goto out;
1575 }
1576 xs_reclassify_socket6(sock);
1577
1578 if (xs_bind6(transport, sock) < 0) {
1579 sock_release(sock);
1580 goto out;
1581 }
1582
1583 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1584 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1585
1586 xs_udp_finish_connecting(xprt, sock);
1587 status = 0;
1588 out:
1589 xprt_wake_pending_tasks(xprt, status);
1590 xprt_clear_connecting(xprt);
1591 }
1592
1593 /*
1594 * We need to preserve the port number so the reply cache on the server can
1595 * find our cached RPC replies when we get around to reconnecting.
1596 */
1597 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1598 {
1599 int result;
1600 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1601 struct sockaddr any;
1602
1603 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1604
1605 /*
1606 * Disconnect the transport socket by doing a connect operation
1607 * with AF_UNSPEC. This should return immediately...
1608 */
1609 memset(&any, 0, sizeof(any));
1610 any.sa_family = AF_UNSPEC;
1611 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1612 if (result)
1613 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1614 result);
1615 }
1616
1617 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1618 {
1619 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1620
1621 if (!transport->inet) {
1622 struct sock *sk = sock->sk;
1623
1624 write_lock_bh(&sk->sk_callback_lock);
1625
1626 xs_save_old_callbacks(transport, sk);
1627
1628 sk->sk_user_data = xprt;
1629 sk->sk_data_ready = xs_tcp_data_ready;
1630 sk->sk_state_change = xs_tcp_state_change;
1631 sk->sk_write_space = xs_tcp_write_space;
1632 sk->sk_error_report = xs_tcp_error_report;
1633 sk->sk_allocation = GFP_ATOMIC;
1634
1635 /* socket options */
1636 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1637 sock_reset_flag(sk, SOCK_LINGER);
1638 tcp_sk(sk)->linger2 = 0;
1639 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1640
1641 xprt_clear_connected(xprt);
1642
1643 /* Reset to new socket */
1644 transport->sock = sock;
1645 transport->inet = sk;
1646
1647 write_unlock_bh(&sk->sk_callback_lock);
1648 }
1649
1650 if (!xprt_bound(xprt))
1651 return -ENOTCONN;
1652
1653 /* Tell the socket layer to start connecting... */
1654 xprt->stat.connect_count++;
1655 xprt->stat.connect_start = jiffies;
1656 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1657 }
1658
1659 /**
1660 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1661 * @work: RPC transport to connect
1662 *
1663 * Invoked by a work queue tasklet.
1664 */
1665 static void xs_tcp_connect_worker4(struct work_struct *work)
1666 {
1667 struct sock_xprt *transport =
1668 container_of(work, struct sock_xprt, connect_worker.work);
1669 struct rpc_xprt *xprt = &transport->xprt;
1670 struct socket *sock = transport->sock;
1671 int err, status = -EIO;
1672
1673 if (xprt->shutdown)
1674 goto out;
1675
1676 if (!sock) {
1677 /* start from scratch */
1678 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1679 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1680 goto out;
1681 }
1682 xs_reclassify_socket4(sock);
1683
1684 if (xs_bind4(transport, sock) < 0) {
1685 sock_release(sock);
1686 goto out;
1687 }
1688 } else
1689 /* "close" the socket, preserving the local port */
1690 xs_tcp_reuse_connection(xprt);
1691
1692 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1693 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1694
1695 status = xs_tcp_finish_connecting(xprt, sock);
1696 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1697 xprt, -status, xprt_connected(xprt),
1698 sock->sk->sk_state);
1699 if (status < 0) {
1700 switch (status) {
1701 case -EINPROGRESS:
1702 case -EALREADY:
1703 goto out_clear;
1704 case -ECONNREFUSED:
1705 case -ECONNRESET:
1706 /* retry with existing socket, after a delay */
1707 break;
1708 default:
1709 /* get rid of existing socket, and retry */
1710 xs_tcp_shutdown(xprt);
1711 }
1712 }
1713 out:
1714 xprt_wake_pending_tasks(xprt, status);
1715 out_clear:
1716 xprt_clear_connecting(xprt);
1717 }
1718
1719 /**
1720 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1721 * @work: RPC transport to connect
1722 *
1723 * Invoked by a work queue tasklet.
1724 */
1725 static void xs_tcp_connect_worker6(struct work_struct *work)
1726 {
1727 struct sock_xprt *transport =
1728 container_of(work, struct sock_xprt, connect_worker.work);
1729 struct rpc_xprt *xprt = &transport->xprt;
1730 struct socket *sock = transport->sock;
1731 int err, status = -EIO;
1732
1733 if (xprt->shutdown)
1734 goto out;
1735
1736 if (!sock) {
1737 /* start from scratch */
1738 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1739 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1740 goto out;
1741 }
1742 xs_reclassify_socket6(sock);
1743
1744 if (xs_bind6(transport, sock) < 0) {
1745 sock_release(sock);
1746 goto out;
1747 }
1748 } else
1749 /* "close" the socket, preserving the local port */
1750 xs_tcp_reuse_connection(xprt);
1751
1752 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1753 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1754
1755 status = xs_tcp_finish_connecting(xprt, sock);
1756 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1757 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1758 if (status < 0) {
1759 switch (status) {
1760 case -EINPROGRESS:
1761 case -EALREADY:
1762 goto out_clear;
1763 case -ECONNREFUSED:
1764 case -ECONNRESET:
1765 /* retry with existing socket, after a delay */
1766 break;
1767 default:
1768 /* get rid of existing socket, and retry */
1769 xs_tcp_shutdown(xprt);
1770 }
1771 }
1772 out:
1773 xprt_wake_pending_tasks(xprt, status);
1774 out_clear:
1775 xprt_clear_connecting(xprt);
1776 }
1777
1778 /**
1779 * xs_connect - connect a socket to a remote endpoint
1780 * @task: address of RPC task that manages state of connect request
1781 *
1782 * TCP: If the remote end dropped the connection, delay reconnecting.
1783 *
1784 * UDP socket connects are synchronous, but we use a work queue anyway
1785 * to guarantee that even unprivileged user processes can set up a
1786 * socket on a privileged port.
1787 *
1788 * If a UDP socket connect fails, the delay behavior here prevents
1789 * retry floods (hard mounts).
1790 */
1791 static void xs_connect(struct rpc_task *task)
1792 {
1793 struct rpc_xprt *xprt = task->tk_xprt;
1794 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1795
1796 if (xprt_test_and_set_connecting(xprt))
1797 return;
1798
1799 if (transport->sock != NULL) {
1800 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1801 "seconds\n",
1802 xprt, xprt->reestablish_timeout / HZ);
1803 queue_delayed_work(rpciod_workqueue,
1804 &transport->connect_worker,
1805 xprt->reestablish_timeout);
1806 xprt->reestablish_timeout <<= 1;
1807 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1808 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1809 } else {
1810 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1811 queue_delayed_work(rpciod_workqueue,
1812 &transport->connect_worker, 0);
1813 }
1814 }
1815
1816 static void xs_tcp_connect(struct rpc_task *task)
1817 {
1818 struct rpc_xprt *xprt = task->tk_xprt;
1819
1820 /* Initiate graceful shutdown of the socket if not already done */
1821 if (test_bit(XPRT_CONNECTED, &xprt->state))
1822 xs_tcp_shutdown(xprt);
1823 /* Exit if we need to wait for socket shutdown to complete */
1824 if (test_bit(XPRT_CLOSING, &xprt->state))
1825 return;
1826 xs_connect(task);
1827 }
1828
1829 /**
1830 * xs_udp_print_stats - display UDP socket-specifc stats
1831 * @xprt: rpc_xprt struct containing statistics
1832 * @seq: output file
1833 *
1834 */
1835 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1836 {
1837 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1838
1839 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1840 transport->port,
1841 xprt->stat.bind_count,
1842 xprt->stat.sends,
1843 xprt->stat.recvs,
1844 xprt->stat.bad_xids,
1845 xprt->stat.req_u,
1846 xprt->stat.bklog_u);
1847 }
1848
1849 /**
1850 * xs_tcp_print_stats - display TCP socket-specifc stats
1851 * @xprt: rpc_xprt struct containing statistics
1852 * @seq: output file
1853 *
1854 */
1855 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1856 {
1857 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1858 long idle_time = 0;
1859
1860 if (xprt_connected(xprt))
1861 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1862
1863 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1864 transport->port,
1865 xprt->stat.bind_count,
1866 xprt->stat.connect_count,
1867 xprt->stat.connect_time,
1868 idle_time,
1869 xprt->stat.sends,
1870 xprt->stat.recvs,
1871 xprt->stat.bad_xids,
1872 xprt->stat.req_u,
1873 xprt->stat.bklog_u);
1874 }
1875
1876 static struct rpc_xprt_ops xs_udp_ops = {
1877 .set_buffer_size = xs_udp_set_buffer_size,
1878 .reserve_xprt = xprt_reserve_xprt_cong,
1879 .release_xprt = xprt_release_xprt_cong,
1880 .rpcbind = rpcb_getport_async,
1881 .set_port = xs_set_port,
1882 .connect = xs_connect,
1883 .buf_alloc = rpc_malloc,
1884 .buf_free = rpc_free,
1885 .send_request = xs_udp_send_request,
1886 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1887 .timer = xs_udp_timer,
1888 .release_request = xprt_release_rqst_cong,
1889 .close = xs_close,
1890 .destroy = xs_destroy,
1891 .print_stats = xs_udp_print_stats,
1892 };
1893
1894 static struct rpc_xprt_ops xs_tcp_ops = {
1895 .reserve_xprt = xprt_reserve_xprt,
1896 .release_xprt = xs_tcp_release_xprt,
1897 .rpcbind = rpcb_getport_async,
1898 .set_port = xs_set_port,
1899 .connect = xs_tcp_connect,
1900 .buf_alloc = rpc_malloc,
1901 .buf_free = rpc_free,
1902 .send_request = xs_tcp_send_request,
1903 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1904 .close = xs_tcp_shutdown,
1905 .destroy = xs_destroy,
1906 .print_stats = xs_tcp_print_stats,
1907 };
1908
1909 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1910 unsigned int slot_table_size)
1911 {
1912 struct rpc_xprt *xprt;
1913 struct sock_xprt *new;
1914
1915 if (args->addrlen > sizeof(xprt->addr)) {
1916 dprintk("RPC: xs_setup_xprt: address too large\n");
1917 return ERR_PTR(-EBADF);
1918 }
1919
1920 new = kzalloc(sizeof(*new), GFP_KERNEL);
1921 if (new == NULL) {
1922 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1923 "rpc_xprt\n");
1924 return ERR_PTR(-ENOMEM);
1925 }
1926 xprt = &new->xprt;
1927
1928 xprt->max_reqs = slot_table_size;
1929 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1930 if (xprt->slot == NULL) {
1931 kfree(xprt);
1932 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1933 "table\n");
1934 return ERR_PTR(-ENOMEM);
1935 }
1936
1937 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1938 xprt->addrlen = args->addrlen;
1939 if (args->srcaddr)
1940 memcpy(&new->addr, args->srcaddr, args->addrlen);
1941
1942 return xprt;
1943 }
1944
1945 static const struct rpc_timeout xs_udp_default_timeout = {
1946 .to_initval = 5 * HZ,
1947 .to_maxval = 30 * HZ,
1948 .to_increment = 5 * HZ,
1949 .to_retries = 5,
1950 };
1951
1952 /**
1953 * xs_setup_udp - Set up transport to use a UDP socket
1954 * @args: rpc transport creation arguments
1955 *
1956 */
1957 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1958 {
1959 struct sockaddr *addr = args->dstaddr;
1960 struct rpc_xprt *xprt;
1961 struct sock_xprt *transport;
1962
1963 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1964 if (IS_ERR(xprt))
1965 return xprt;
1966 transport = container_of(xprt, struct sock_xprt, xprt);
1967
1968 xprt->prot = IPPROTO_UDP;
1969 xprt->tsh_size = 0;
1970 /* XXX: header size can vary due to auth type, IPv6, etc. */
1971 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1972
1973 xprt->bind_timeout = XS_BIND_TO;
1974 xprt->connect_timeout = XS_UDP_CONN_TO;
1975 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1976 xprt->idle_timeout = XS_IDLE_DISC_TO;
1977
1978 xprt->ops = &xs_udp_ops;
1979
1980 xprt->timeout = &xs_udp_default_timeout;
1981
1982 switch (addr->sa_family) {
1983 case AF_INET:
1984 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1985 xprt_set_bound(xprt);
1986
1987 INIT_DELAYED_WORK(&transport->connect_worker,
1988 xs_udp_connect_worker4);
1989 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1990 break;
1991 case AF_INET6:
1992 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1993 xprt_set_bound(xprt);
1994
1995 INIT_DELAYED_WORK(&transport->connect_worker,
1996 xs_udp_connect_worker6);
1997 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1998 break;
1999 default:
2000 kfree(xprt);
2001 return ERR_PTR(-EAFNOSUPPORT);
2002 }
2003
2004 dprintk("RPC: set up transport to address %s\n",
2005 xprt->address_strings[RPC_DISPLAY_ALL]);
2006
2007 if (try_module_get(THIS_MODULE))
2008 return xprt;
2009
2010 kfree(xprt->slot);
2011 kfree(xprt);
2012 return ERR_PTR(-EINVAL);
2013 }
2014
2015 static const struct rpc_timeout xs_tcp_default_timeout = {
2016 .to_initval = 60 * HZ,
2017 .to_maxval = 60 * HZ,
2018 .to_retries = 2,
2019 };
2020
2021 /**
2022 * xs_setup_tcp - Set up transport to use a TCP socket
2023 * @args: rpc transport creation arguments
2024 *
2025 */
2026 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2027 {
2028 struct sockaddr *addr = args->dstaddr;
2029 struct rpc_xprt *xprt;
2030 struct sock_xprt *transport;
2031
2032 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2033 if (IS_ERR(xprt))
2034 return xprt;
2035 transport = container_of(xprt, struct sock_xprt, xprt);
2036
2037 xprt->prot = IPPROTO_TCP;
2038 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2039 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2040
2041 xprt->bind_timeout = XS_BIND_TO;
2042 xprt->connect_timeout = XS_TCP_CONN_TO;
2043 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2044 xprt->idle_timeout = XS_IDLE_DISC_TO;
2045
2046 xprt->ops = &xs_tcp_ops;
2047 xprt->timeout = &xs_tcp_default_timeout;
2048
2049 switch (addr->sa_family) {
2050 case AF_INET:
2051 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2052 xprt_set_bound(xprt);
2053
2054 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2055 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2056 break;
2057 case AF_INET6:
2058 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2059 xprt_set_bound(xprt);
2060
2061 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2062 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2063 break;
2064 default:
2065 kfree(xprt);
2066 return ERR_PTR(-EAFNOSUPPORT);
2067 }
2068
2069 dprintk("RPC: set up transport to address %s\n",
2070 xprt->address_strings[RPC_DISPLAY_ALL]);
2071
2072 if (try_module_get(THIS_MODULE))
2073 return xprt;
2074
2075 kfree(xprt->slot);
2076 kfree(xprt);
2077 return ERR_PTR(-EINVAL);
2078 }
2079
2080 static struct xprt_class xs_udp_transport = {
2081 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2082 .name = "udp",
2083 .owner = THIS_MODULE,
2084 .ident = IPPROTO_UDP,
2085 .setup = xs_setup_udp,
2086 };
2087
2088 static struct xprt_class xs_tcp_transport = {
2089 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2090 .name = "tcp",
2091 .owner = THIS_MODULE,
2092 .ident = IPPROTO_TCP,
2093 .setup = xs_setup_tcp,
2094 };
2095
2096 /**
2097 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2098 *
2099 */
2100 int init_socket_xprt(void)
2101 {
2102 #ifdef RPC_DEBUG
2103 if (!sunrpc_table_header)
2104 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2105 #endif
2106
2107 xprt_register_transport(&xs_udp_transport);
2108 xprt_register_transport(&xs_tcp_transport);
2109
2110 return 0;
2111 }
2112
2113 /**
2114 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2115 *
2116 */
2117 void cleanup_socket_xprt(void)
2118 {
2119 #ifdef RPC_DEBUG
2120 if (sunrpc_table_header) {
2121 unregister_sysctl_table(sunrpc_table_header);
2122 sunrpc_table_header = NULL;
2123 }
2124 #endif
2125
2126 xprt_unregister_transport(&xs_udp_transport);
2127 xprt_unregister_transport(&xs_tcp_transport);
2128 }
Linus' kernel tree