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drm: Rip out the racy, unused vblank signal code.
[linux-2.6/linux-2.6-openrd.git] / net / sunrpc / xprtsock.c
blob5cbb404c4cdf89da7a6dd328ec5d7137d2d54dbc
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 -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 -ECONNRESET:
700 xs_tcp_shutdown(xprt);
701 case -ECONNREFUSED:
702 case -ENOTCONN:
703 case -EPIPE:
704 status = -ENOTCONN;
705 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
706 break;
707 default:
708 dprintk("RPC: sendmsg returned unrecognized error %d\n",
709 -status);
710 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
711 xs_tcp_shutdown(xprt);
712 }
713
714 return status;
715 }
716
717 /**
718 * xs_tcp_release_xprt - clean up after a tcp transmission
719 * @xprt: transport
720 * @task: rpc task
721 *
722 * This cleans up if an error causes us to abort the transmission of a request.
723 * In this case, the socket may need to be reset in order to avoid confusing
724 * the server.
725 */
726 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
727 {
728 struct rpc_rqst *req;
729
730 if (task != xprt->snd_task)
731 return;
732 if (task == NULL)
733 goto out_release;
734 req = task->tk_rqstp;
735 if (req->rq_bytes_sent == 0)
736 goto out_release;
737 if (req->rq_bytes_sent == req->rq_snd_buf.len)
738 goto out_release;
739 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
740 out_release:
741 xprt_release_xprt(xprt, task);
742 }
743
744 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
745 {
746 transport->old_data_ready = sk->sk_data_ready;
747 transport->old_state_change = sk->sk_state_change;
748 transport->old_write_space = sk->sk_write_space;
749 transport->old_error_report = sk->sk_error_report;
750 }
751
752 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
753 {
754 sk->sk_data_ready = transport->old_data_ready;
755 sk->sk_state_change = transport->old_state_change;
756 sk->sk_write_space = transport->old_write_space;
757 sk->sk_error_report = transport->old_error_report;
758 }
759
760 /**
761 * xs_close - close a socket
762 * @xprt: transport
763 *
764 * This is used when all requests are complete; ie, no DRC state remains
765 * on the server we want to save.
766 */
767 static void xs_close(struct rpc_xprt *xprt)
768 {
769 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
770 struct socket *sock = transport->sock;
771 struct sock *sk = transport->inet;
772
773 if (!sk)
774 goto clear_close_wait;
775
776 dprintk("RPC: xs_close xprt %p\n", xprt);
777
778 write_lock_bh(&sk->sk_callback_lock);
779 transport->inet = NULL;
780 transport->sock = NULL;
781
782 sk->sk_user_data = NULL;
783
784 xs_restore_old_callbacks(transport, sk);
785 write_unlock_bh(&sk->sk_callback_lock);
786
787 sk->sk_no_check = 0;
788
789 sock_release(sock);
790 clear_close_wait:
791 smp_mb__before_clear_bit();
792 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
793 clear_bit(XPRT_CLOSING, &xprt->state);
794 smp_mb__after_clear_bit();
795 xprt_disconnect_done(xprt);
796 }
797
798 /**
799 * xs_destroy - prepare to shutdown a transport
800 * @xprt: doomed transport
801 *
802 */
803 static void xs_destroy(struct rpc_xprt *xprt)
804 {
805 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
806
807 dprintk("RPC: xs_destroy xprt %p\n", xprt);
808
809 cancel_rearming_delayed_work(&transport->connect_worker);
810
811 xs_close(xprt);
812 xs_free_peer_addresses(xprt);
813 kfree(xprt->slot);
814 kfree(xprt);
815 module_put(THIS_MODULE);
816 }
817
818 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
819 {
820 return (struct rpc_xprt *) sk->sk_user_data;
821 }
822
823 /**
824 * xs_udp_data_ready - "data ready" callback for UDP sockets
825 * @sk: socket with data to read
826 * @len: how much data to read
827 *
828 */
829 static void xs_udp_data_ready(struct sock *sk, int len)
830 {
831 struct rpc_task *task;
832 struct rpc_xprt *xprt;
833 struct rpc_rqst *rovr;
834 struct sk_buff *skb;
835 int err, repsize, copied;
836 u32 _xid;
837 __be32 *xp;
838
839 read_lock(&sk->sk_callback_lock);
840 dprintk("RPC: xs_udp_data_ready...\n");
841 if (!(xprt = xprt_from_sock(sk)))
842 goto out;
843
844 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
845 goto out;
846
847 if (xprt->shutdown)
848 goto dropit;
849
850 repsize = skb->len - sizeof(struct udphdr);
851 if (repsize < 4) {
852 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
853 goto dropit;
854 }
855
856 /* Copy the XID from the skb... */
857 xp = skb_header_pointer(skb, sizeof(struct udphdr),
858 sizeof(_xid), &_xid);
859 if (xp == NULL)
860 goto dropit;
861
862 /* Look up and lock the request corresponding to the given XID */
863 spin_lock(&xprt->transport_lock);
864 rovr = xprt_lookup_rqst(xprt, *xp);
865 if (!rovr)
866 goto out_unlock;
867 task = rovr->rq_task;
868
869 if ((copied = rovr->rq_private_buf.buflen) > repsize)
870 copied = repsize;
871
872 /* Suck it into the iovec, verify checksum if not done by hw. */
873 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
874 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
875 goto out_unlock;
876 }
877
878 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
879
880 /* Something worked... */
881 dst_confirm(skb->dst);
882
883 xprt_adjust_cwnd(task, copied);
884 xprt_update_rtt(task);
885 xprt_complete_rqst(task, copied);
886
887 out_unlock:
888 spin_unlock(&xprt->transport_lock);
889 dropit:
890 skb_free_datagram(sk, skb);
891 out:
892 read_unlock(&sk->sk_callback_lock);
893 }
894
895 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
896 {
897 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
898 size_t len, used;
899 char *p;
900
901 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
902 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
903 used = xdr_skb_read_bits(desc, p, len);
904 transport->tcp_offset += used;
905 if (used != len)
906 return;
907
908 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
909 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
910 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
911 else
912 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
913 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
914
915 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
916 transport->tcp_offset = 0;
917
918 /* Sanity check of the record length */
919 if (unlikely(transport->tcp_reclen < 4)) {
920 dprintk("RPC: invalid TCP record fragment length\n");
921 xprt_force_disconnect(xprt);
922 return;
923 }
924 dprintk("RPC: reading TCP record fragment of length %d\n",
925 transport->tcp_reclen);
926 }
927
928 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
929 {
930 if (transport->tcp_offset == transport->tcp_reclen) {
931 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
932 transport->tcp_offset = 0;
933 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
934 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
935 transport->tcp_flags |= TCP_RCV_COPY_XID;
936 transport->tcp_copied = 0;
937 }
938 }
939 }
940
941 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
942 {
943 size_t len, used;
944 char *p;
945
946 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
947 dprintk("RPC: reading XID (%Zu bytes)\n", len);
948 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
949 used = xdr_skb_read_bits(desc, p, len);
950 transport->tcp_offset += used;
951 if (used != len)
952 return;
953 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
954 transport->tcp_flags |= TCP_RCV_COPY_DATA;
955 transport->tcp_copied = 4;
956 dprintk("RPC: reading reply for XID %08x\n",
957 ntohl(transport->tcp_xid));
958 xs_tcp_check_fraghdr(transport);
959 }
960
961 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
962 {
963 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
964 struct rpc_rqst *req;
965 struct xdr_buf *rcvbuf;
966 size_t len;
967 ssize_t r;
968
969 /* Find and lock the request corresponding to this xid */
970 spin_lock(&xprt->transport_lock);
971 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
972 if (!req) {
973 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
974 dprintk("RPC: XID %08x request not found!\n",
975 ntohl(transport->tcp_xid));
976 spin_unlock(&xprt->transport_lock);
977 return;
978 }
979
980 rcvbuf = &req->rq_private_buf;
981 len = desc->count;
982 if (len > transport->tcp_reclen - transport->tcp_offset) {
983 struct xdr_skb_reader my_desc;
984
985 len = transport->tcp_reclen - transport->tcp_offset;
986 memcpy(&my_desc, desc, sizeof(my_desc));
987 my_desc.count = len;
988 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
989 &my_desc, xdr_skb_read_bits);
990 desc->count -= r;
991 desc->offset += r;
992 } else
993 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
994 desc, xdr_skb_read_bits);
995
996 if (r > 0) {
997 transport->tcp_copied += r;
998 transport->tcp_offset += r;
999 }
1000 if (r != len) {
1001 /* Error when copying to the receive buffer,
1002 * usually because we weren't able to allocate
1003 * additional buffer pages. All we can do now
1004 * is turn off TCP_RCV_COPY_DATA, so the request
1005 * will not receive any additional updates,
1006 * and time out.
1007 * Any remaining data from this record will
1008 * be discarded.
1009 */
1010 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1011 dprintk("RPC: XID %08x truncated request\n",
1012 ntohl(transport->tcp_xid));
1013 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1014 "tcp_offset = %u, tcp_reclen = %u\n",
1015 xprt, transport->tcp_copied,
1016 transport->tcp_offset, transport->tcp_reclen);
1017 goto out;
1018 }
1019
1020 dprintk("RPC: XID %08x read %Zd bytes\n",
1021 ntohl(transport->tcp_xid), r);
1022 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1023 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1024 transport->tcp_offset, transport->tcp_reclen);
1025
1026 if (transport->tcp_copied == req->rq_private_buf.buflen)
1027 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1028 else if (transport->tcp_offset == transport->tcp_reclen) {
1029 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1030 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1031 }
1032
1033 out:
1034 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1035 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1036 spin_unlock(&xprt->transport_lock);
1037 xs_tcp_check_fraghdr(transport);
1038 }
1039
1040 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1041 {
1042 size_t len;
1043
1044 len = transport->tcp_reclen - transport->tcp_offset;
1045 if (len > desc->count)
1046 len = desc->count;
1047 desc->count -= len;
1048 desc->offset += len;
1049 transport->tcp_offset += len;
1050 dprintk("RPC: discarded %Zu bytes\n", len);
1051 xs_tcp_check_fraghdr(transport);
1052 }
1053
1054 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1055 {
1056 struct rpc_xprt *xprt = rd_desc->arg.data;
1057 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1058 struct xdr_skb_reader desc = {
1059 .skb = skb,
1060 .offset = offset,
1061 .count = len,
1062 };
1063
1064 dprintk("RPC: xs_tcp_data_recv started\n");
1065 do {
1066 /* Read in a new fragment marker if necessary */
1067 /* Can we ever really expect to get completely empty fragments? */
1068 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1069 xs_tcp_read_fraghdr(xprt, &desc);
1070 continue;
1071 }
1072 /* Read in the xid if necessary */
1073 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1074 xs_tcp_read_xid(transport, &desc);
1075 continue;
1076 }
1077 /* Read in the request data */
1078 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1079 xs_tcp_read_request(xprt, &desc);
1080 continue;
1081 }
1082 /* Skip over any trailing bytes on short reads */
1083 xs_tcp_read_discard(transport, &desc);
1084 } while (desc.count);
1085 dprintk("RPC: xs_tcp_data_recv done\n");
1086 return len - desc.count;
1087 }
1088
1089 /**
1090 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1091 * @sk: socket with data to read
1092 * @bytes: how much data to read
1093 *
1094 */
1095 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1096 {
1097 struct rpc_xprt *xprt;
1098 read_descriptor_t rd_desc;
1099 int read;
1100
1101 dprintk("RPC: xs_tcp_data_ready...\n");
1102
1103 read_lock(&sk->sk_callback_lock);
1104 if (!(xprt = xprt_from_sock(sk)))
1105 goto out;
1106 if (xprt->shutdown)
1107 goto out;
1108
1109 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1110 rd_desc.arg.data = xprt;
1111 do {
1112 rd_desc.count = 65536;
1113 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1114 } while (read > 0);
1115 out:
1116 read_unlock(&sk->sk_callback_lock);
1117 }
1118
1119 /**
1120 * xs_tcp_state_change - callback to handle TCP socket state changes
1121 * @sk: socket whose state has changed
1122 *
1123 */
1124 static void xs_tcp_state_change(struct sock *sk)
1125 {
1126 struct rpc_xprt *xprt;
1127
1128 read_lock(&sk->sk_callback_lock);
1129 if (!(xprt = xprt_from_sock(sk)))
1130 goto out;
1131 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1132 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1133 sk->sk_state, xprt_connected(xprt),
1134 sock_flag(sk, SOCK_DEAD),
1135 sock_flag(sk, SOCK_ZAPPED));
1136
1137 switch (sk->sk_state) {
1138 case TCP_ESTABLISHED:
1139 spin_lock_bh(&xprt->transport_lock);
1140 if (!xprt_test_and_set_connected(xprt)) {
1141 struct sock_xprt *transport = container_of(xprt,
1142 struct sock_xprt, xprt);
1143
1144 /* Reset TCP record info */
1145 transport->tcp_offset = 0;
1146 transport->tcp_reclen = 0;
1147 transport->tcp_copied = 0;
1148 transport->tcp_flags =
1149 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1150
1151 xprt_wake_pending_tasks(xprt, 0);
1152 }
1153 spin_unlock_bh(&xprt->transport_lock);
1154 break;
1155 case TCP_FIN_WAIT1:
1156 /* The client initiated a shutdown of the socket */
1157 xprt->connect_cookie++;
1158 xprt->reestablish_timeout = 0;
1159 set_bit(XPRT_CLOSING, &xprt->state);
1160 smp_mb__before_clear_bit();
1161 clear_bit(XPRT_CONNECTED, &xprt->state);
1162 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1163 smp_mb__after_clear_bit();
1164 break;
1165 case TCP_CLOSE_WAIT:
1166 /* The server initiated a shutdown of the socket */
1167 set_bit(XPRT_CLOSING, &xprt->state);
1168 xprt_force_disconnect(xprt);
1169 case TCP_SYN_SENT:
1170 xprt->connect_cookie++;
1171 case TCP_CLOSING:
1172 /*
1173 * If the server closed down the connection, make sure that
1174 * we back off before reconnecting
1175 */
1176 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1177 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1178 break;
1179 case TCP_LAST_ACK:
1180 smp_mb__before_clear_bit();
1181 clear_bit(XPRT_CONNECTED, &xprt->state);
1182 smp_mb__after_clear_bit();
1183 break;
1184 case TCP_CLOSE:
1185 smp_mb__before_clear_bit();
1186 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1187 clear_bit(XPRT_CLOSING, &xprt->state);
1188 smp_mb__after_clear_bit();
1189 /* Mark transport as closed and wake up all pending tasks */
1190 xprt_disconnect_done(xprt);
1191 }
1192 out:
1193 read_unlock(&sk->sk_callback_lock);
1194 }
1195
1196 /**
1197 * xs_tcp_error_report - callback mainly for catching RST events
1198 * @sk: socket
1199 */
1200 static void xs_tcp_error_report(struct sock *sk)
1201 {
1202 struct rpc_xprt *xprt;
1203
1204 read_lock(&sk->sk_callback_lock);
1205 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1206 goto out;
1207 if (!(xprt = xprt_from_sock(sk)))
1208 goto out;
1209 dprintk("RPC: %s client %p...\n"
1210 "RPC: error %d\n",
1211 __func__, xprt, sk->sk_err);
1212
1213 xprt_force_disconnect(xprt);
1214 out:
1215 read_unlock(&sk->sk_callback_lock);
1216 }
1217
1218 /**
1219 * xs_udp_write_space - callback invoked when socket buffer space
1220 * becomes available
1221 * @sk: socket whose state has changed
1222 *
1223 * Called when more output buffer space is available for this socket.
1224 * We try not to wake our writers until they can make "significant"
1225 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1226 * with a bunch of small requests.
1227 */
1228 static void xs_udp_write_space(struct sock *sk)
1229 {
1230 read_lock(&sk->sk_callback_lock);
1231
1232 /* from net/core/sock.c:sock_def_write_space */
1233 if (sock_writeable(sk)) {
1234 struct socket *sock;
1235 struct rpc_xprt *xprt;
1236
1237 if (unlikely(!(sock = sk->sk_socket)))
1238 goto out;
1239 clear_bit(SOCK_NOSPACE, &sock->flags);
1240
1241 if (unlikely(!(xprt = xprt_from_sock(sk))))
1242 goto out;
1243 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1244 goto out;
1245
1246 xprt_write_space(xprt);
1247 }
1248
1249 out:
1250 read_unlock(&sk->sk_callback_lock);
1251 }
1252
1253 /**
1254 * xs_tcp_write_space - callback invoked when socket buffer space
1255 * becomes available
1256 * @sk: socket whose state has changed
1257 *
1258 * Called when more output buffer space is available for this socket.
1259 * We try not to wake our writers until they can make "significant"
1260 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1261 * with a bunch of small requests.
1262 */
1263 static void xs_tcp_write_space(struct sock *sk)
1264 {
1265 read_lock(&sk->sk_callback_lock);
1266
1267 /* from net/core/stream.c:sk_stream_write_space */
1268 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1269 struct socket *sock;
1270 struct rpc_xprt *xprt;
1271
1272 if (unlikely(!(sock = sk->sk_socket)))
1273 goto out;
1274 clear_bit(SOCK_NOSPACE, &sock->flags);
1275
1276 if (unlikely(!(xprt = xprt_from_sock(sk))))
1277 goto out;
1278 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1279 goto out;
1280
1281 xprt_write_space(xprt);
1282 }
1283
1284 out:
1285 read_unlock(&sk->sk_callback_lock);
1286 }
1287
1288 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1289 {
1290 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1291 struct sock *sk = transport->inet;
1292
1293 if (transport->rcvsize) {
1294 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1295 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1296 }
1297 if (transport->sndsize) {
1298 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1299 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1300 sk->sk_write_space(sk);
1301 }
1302 }
1303
1304 /**
1305 * xs_udp_set_buffer_size - set send and receive limits
1306 * @xprt: generic transport
1307 * @sndsize: requested size of send buffer, in bytes
1308 * @rcvsize: requested size of receive buffer, in bytes
1309 *
1310 * Set socket send and receive buffer size limits.
1311 */
1312 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1313 {
1314 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1315
1316 transport->sndsize = 0;
1317 if (sndsize)
1318 transport->sndsize = sndsize + 1024;
1319 transport->rcvsize = 0;
1320 if (rcvsize)
1321 transport->rcvsize = rcvsize + 1024;
1322
1323 xs_udp_do_set_buffer_size(xprt);
1324 }
1325
1326 /**
1327 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1328 * @task: task that timed out
1329 *
1330 * Adjust the congestion window after a retransmit timeout has occurred.
1331 */
1332 static void xs_udp_timer(struct rpc_task *task)
1333 {
1334 xprt_adjust_cwnd(task, -ETIMEDOUT);
1335 }
1336
1337 static unsigned short xs_get_random_port(void)
1338 {
1339 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1340 unsigned short rand = (unsigned short) net_random() % range;
1341 return rand + xprt_min_resvport;
1342 }
1343
1344 /**
1345 * xs_set_port - reset the port number in the remote endpoint address
1346 * @xprt: generic transport
1347 * @port: new port number
1348 *
1349 */
1350 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1351 {
1352 struct sockaddr *addr = xs_addr(xprt);
1353
1354 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1355
1356 switch (addr->sa_family) {
1357 case AF_INET:
1358 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1359 break;
1360 case AF_INET6:
1361 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1362 break;
1363 default:
1364 BUG();
1365 }
1366 }
1367
1368 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1369 {
1370 unsigned short port = transport->port;
1371
1372 if (port == 0 && transport->xprt.resvport)
1373 port = xs_get_random_port();
1374 return port;
1375 }
1376
1377 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1378 {
1379 if (transport->port != 0)
1380 transport->port = 0;
1381 if (!transport->xprt.resvport)
1382 return 0;
1383 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1384 return xprt_max_resvport;
1385 return --port;
1386 }
1387
1388 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1389 {
1390 struct sockaddr_in myaddr = {
1391 .sin_family = AF_INET,
1392 };
1393 struct sockaddr_in *sa;
1394 int err, nloop = 0;
1395 unsigned short port = xs_get_srcport(transport, sock);
1396 unsigned short last;
1397
1398 sa = (struct sockaddr_in *)&transport->addr;
1399 myaddr.sin_addr = sa->sin_addr;
1400 do {
1401 myaddr.sin_port = htons(port);
1402 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1403 sizeof(myaddr));
1404 if (port == 0)
1405 break;
1406 if (err == 0) {
1407 transport->port = port;
1408 break;
1409 }
1410 last = port;
1411 port = xs_next_srcport(transport, sock, port);
1412 if (port > last)
1413 nloop++;
1414 } while (err == -EADDRINUSE && nloop != 2);
1415 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1416 __func__, &myaddr.sin_addr,
1417 port, err ? "failed" : "ok", err);
1418 return err;
1419 }
1420
1421 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1422 {
1423 struct sockaddr_in6 myaddr = {
1424 .sin6_family = AF_INET6,
1425 };
1426 struct sockaddr_in6 *sa;
1427 int err, nloop = 0;
1428 unsigned short port = xs_get_srcport(transport, sock);
1429 unsigned short last;
1430
1431 sa = (struct sockaddr_in6 *)&transport->addr;
1432 myaddr.sin6_addr = sa->sin6_addr;
1433 do {
1434 myaddr.sin6_port = htons(port);
1435 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1436 sizeof(myaddr));
1437 if (port == 0)
1438 break;
1439 if (err == 0) {
1440 transport->port = port;
1441 break;
1442 }
1443 last = port;
1444 port = xs_next_srcport(transport, sock, port);
1445 if (port > last)
1446 nloop++;
1447 } while (err == -EADDRINUSE && nloop != 2);
1448 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1449 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1450 return err;
1451 }
1452
1453 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1454 static struct lock_class_key xs_key[2];
1455 static struct lock_class_key xs_slock_key[2];
1456
1457 static inline void xs_reclassify_socket4(struct socket *sock)
1458 {
1459 struct sock *sk = sock->sk;
1460
1461 BUG_ON(sock_owned_by_user(sk));
1462 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1463 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1464 }
1465
1466 static inline void xs_reclassify_socket6(struct socket *sock)
1467 {
1468 struct sock *sk = sock->sk;
1469
1470 BUG_ON(sock_owned_by_user(sk));
1471 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1472 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1473 }
1474 #else
1475 static inline void xs_reclassify_socket4(struct socket *sock)
1476 {
1477 }
1478
1479 static inline void xs_reclassify_socket6(struct socket *sock)
1480 {
1481 }
1482 #endif
1483
1484 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1485 {
1486 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1487
1488 if (!transport->inet) {
1489 struct sock *sk = sock->sk;
1490
1491 write_lock_bh(&sk->sk_callback_lock);
1492
1493 xs_save_old_callbacks(transport, sk);
1494
1495 sk->sk_user_data = xprt;
1496 sk->sk_data_ready = xs_udp_data_ready;
1497 sk->sk_write_space = xs_udp_write_space;
1498 sk->sk_no_check = UDP_CSUM_NORCV;
1499 sk->sk_allocation = GFP_ATOMIC;
1500
1501 xprt_set_connected(xprt);
1502
1503 /* Reset to new socket */
1504 transport->sock = sock;
1505 transport->inet = sk;
1506
1507 write_unlock_bh(&sk->sk_callback_lock);
1508 }
1509 xs_udp_do_set_buffer_size(xprt);
1510 }
1511
1512 /**
1513 * xs_udp_connect_worker4 - set up a UDP socket
1514 * @work: RPC transport to connect
1515 *
1516 * Invoked by a work queue tasklet.
1517 */
1518 static void xs_udp_connect_worker4(struct work_struct *work)
1519 {
1520 struct sock_xprt *transport =
1521 container_of(work, struct sock_xprt, connect_worker.work);
1522 struct rpc_xprt *xprt = &transport->xprt;
1523 struct socket *sock = transport->sock;
1524 int err, status = -EIO;
1525
1526 if (xprt->shutdown || !xprt_bound(xprt))
1527 goto out;
1528
1529 /* Start by resetting any existing state */
1530 xs_close(xprt);
1531
1532 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1533 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1534 goto out;
1535 }
1536 xs_reclassify_socket4(sock);
1537
1538 if (xs_bind4(transport, sock)) {
1539 sock_release(sock);
1540 goto out;
1541 }
1542
1543 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1544 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1545
1546 xs_udp_finish_connecting(xprt, sock);
1547 status = 0;
1548 out:
1549 xprt_wake_pending_tasks(xprt, status);
1550 xprt_clear_connecting(xprt);
1551 }
1552
1553 /**
1554 * xs_udp_connect_worker6 - set up a UDP socket
1555 * @work: RPC transport to connect
1556 *
1557 * Invoked by a work queue tasklet.
1558 */
1559 static void xs_udp_connect_worker6(struct work_struct *work)
1560 {
1561 struct sock_xprt *transport =
1562 container_of(work, struct sock_xprt, connect_worker.work);
1563 struct rpc_xprt *xprt = &transport->xprt;
1564 struct socket *sock = transport->sock;
1565 int err, status = -EIO;
1566
1567 if (xprt->shutdown || !xprt_bound(xprt))
1568 goto out;
1569
1570 /* Start by resetting any existing state */
1571 xs_close(xprt);
1572
1573 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1574 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1575 goto out;
1576 }
1577 xs_reclassify_socket6(sock);
1578
1579 if (xs_bind6(transport, sock) < 0) {
1580 sock_release(sock);
1581 goto out;
1582 }
1583
1584 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1585 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1586
1587 xs_udp_finish_connecting(xprt, sock);
1588 status = 0;
1589 out:
1590 xprt_wake_pending_tasks(xprt, status);
1591 xprt_clear_connecting(xprt);
1592 }
1593
1594 /*
1595 * We need to preserve the port number so the reply cache on the server can
1596 * find our cached RPC replies when we get around to reconnecting.
1597 */
1598 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1599 {
1600 int result;
1601 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1602 struct sockaddr any;
1603
1604 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1605
1606 /*
1607 * Disconnect the transport socket by doing a connect operation
1608 * with AF_UNSPEC. This should return immediately...
1609 */
1610 memset(&any, 0, sizeof(any));
1611 any.sa_family = AF_UNSPEC;
1612 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1613 if (result)
1614 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1615 result);
1616 }
1617
1618 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1619 {
1620 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1621
1622 if (!transport->inet) {
1623 struct sock *sk = sock->sk;
1624
1625 write_lock_bh(&sk->sk_callback_lock);
1626
1627 xs_save_old_callbacks(transport, sk);
1628
1629 sk->sk_user_data = xprt;
1630 sk->sk_data_ready = xs_tcp_data_ready;
1631 sk->sk_state_change = xs_tcp_state_change;
1632 sk->sk_write_space = xs_tcp_write_space;
1633 sk->sk_error_report = xs_tcp_error_report;
1634 sk->sk_allocation = GFP_ATOMIC;
1635
1636 /* socket options */
1637 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1638 sock_reset_flag(sk, SOCK_LINGER);
1639 tcp_sk(sk)->linger2 = 0;
1640 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1641
1642 xprt_clear_connected(xprt);
1643
1644 /* Reset to new socket */
1645 transport->sock = sock;
1646 transport->inet = sk;
1647
1648 write_unlock_bh(&sk->sk_callback_lock);
1649 }
1650
1651 /* Tell the socket layer to start connecting... */
1652 xprt->stat.connect_count++;
1653 xprt->stat.connect_start = jiffies;
1654 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1655 }
1656
1657 /**
1658 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1659 * @work: RPC transport to connect
1660 *
1661 * Invoked by a work queue tasklet.
1662 */
1663 static void xs_tcp_connect_worker4(struct work_struct *work)
1664 {
1665 struct sock_xprt *transport =
1666 container_of(work, struct sock_xprt, connect_worker.work);
1667 struct rpc_xprt *xprt = &transport->xprt;
1668 struct socket *sock = transport->sock;
1669 int err, status = -EIO;
1670
1671 if (xprt->shutdown || !xprt_bound(xprt))
1672 goto out;
1673
1674 if (!sock) {
1675 /* start from scratch */
1676 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1677 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1678 goto out;
1679 }
1680 xs_reclassify_socket4(sock);
1681
1682 if (xs_bind4(transport, sock) < 0) {
1683 sock_release(sock);
1684 goto out;
1685 }
1686 } else
1687 /* "close" the socket, preserving the local port */
1688 xs_tcp_reuse_connection(xprt);
1689
1690 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1691 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1692
1693 status = xs_tcp_finish_connecting(xprt, sock);
1694 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1695 xprt, -status, xprt_connected(xprt),
1696 sock->sk->sk_state);
1697 if (status < 0) {
1698 switch (status) {
1699 case -EINPROGRESS:
1700 case -EALREADY:
1701 goto out_clear;
1702 case -ECONNREFUSED:
1703 case -ECONNRESET:
1704 /* retry with existing socket, after a delay */
1705 break;
1706 default:
1707 /* get rid of existing socket, and retry */
1708 xs_tcp_shutdown(xprt);
1709 }
1710 }
1711 out:
1712 xprt_wake_pending_tasks(xprt, status);
1713 out_clear:
1714 xprt_clear_connecting(xprt);
1715 }
1716
1717 /**
1718 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1719 * @work: RPC transport to connect
1720 *
1721 * Invoked by a work queue tasklet.
1722 */
1723 static void xs_tcp_connect_worker6(struct work_struct *work)
1724 {
1725 struct sock_xprt *transport =
1726 container_of(work, struct sock_xprt, connect_worker.work);
1727 struct rpc_xprt *xprt = &transport->xprt;
1728 struct socket *sock = transport->sock;
1729 int err, status = -EIO;
1730
1731 if (xprt->shutdown || !xprt_bound(xprt))
1732 goto out;
1733
1734 if (!sock) {
1735 /* start from scratch */
1736 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1737 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1738 goto out;
1739 }
1740 xs_reclassify_socket6(sock);
1741
1742 if (xs_bind6(transport, sock) < 0) {
1743 sock_release(sock);
1744 goto out;
1745 }
1746 } else
1747 /* "close" the socket, preserving the local port */
1748 xs_tcp_reuse_connection(xprt);
1749
1750 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1751 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1752
1753 status = xs_tcp_finish_connecting(xprt, sock);
1754 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1755 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1756 if (status < 0) {
1757 switch (status) {
1758 case -EINPROGRESS:
1759 case -EALREADY:
1760 goto out_clear;
1761 case -ECONNREFUSED:
1762 case -ECONNRESET:
1763 /* retry with existing socket, after a delay */
1764 break;
1765 default:
1766 /* get rid of existing socket, and retry */
1767 xs_tcp_shutdown(xprt);
1768 }
1769 }
1770 out:
1771 xprt_wake_pending_tasks(xprt, status);
1772 out_clear:
1773 xprt_clear_connecting(xprt);
1774 }
1775
1776 /**
1777 * xs_connect - connect a socket to a remote endpoint
1778 * @task: address of RPC task that manages state of connect request
1779 *
1780 * TCP: If the remote end dropped the connection, delay reconnecting.
1781 *
1782 * UDP socket connects are synchronous, but we use a work queue anyway
1783 * to guarantee that even unprivileged user processes can set up a
1784 * socket on a privileged port.
1785 *
1786 * If a UDP socket connect fails, the delay behavior here prevents
1787 * retry floods (hard mounts).
1788 */
1789 static void xs_connect(struct rpc_task *task)
1790 {
1791 struct rpc_xprt *xprt = task->tk_xprt;
1792 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1793
1794 if (xprt_test_and_set_connecting(xprt))
1795 return;
1796
1797 if (transport->sock != NULL) {
1798 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1799 "seconds\n",
1800 xprt, xprt->reestablish_timeout / HZ);
1801 queue_delayed_work(rpciod_workqueue,
1802 &transport->connect_worker,
1803 xprt->reestablish_timeout);
1804 xprt->reestablish_timeout <<= 1;
1805 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1806 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1807 } else {
1808 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1809 queue_delayed_work(rpciod_workqueue,
1810 &transport->connect_worker, 0);
1811 }
1812 }
1813
1814 static void xs_tcp_connect(struct rpc_task *task)
1815 {
1816 struct rpc_xprt *xprt = task->tk_xprt;
1817
1818 /* Initiate graceful shutdown of the socket if not already done */
1819 if (test_bit(XPRT_CONNECTED, &xprt->state))
1820 xs_tcp_shutdown(xprt);
1821 /* Exit if we need to wait for socket shutdown to complete */
1822 if (test_bit(XPRT_CLOSING, &xprt->state))
1823 return;
1824 xs_connect(task);
1825 }
1826
1827 /**
1828 * xs_udp_print_stats - display UDP socket-specifc stats
1829 * @xprt: rpc_xprt struct containing statistics
1830 * @seq: output file
1831 *
1832 */
1833 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1834 {
1835 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1836
1837 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1838 transport->port,
1839 xprt->stat.bind_count,
1840 xprt->stat.sends,
1841 xprt->stat.recvs,
1842 xprt->stat.bad_xids,
1843 xprt->stat.req_u,
1844 xprt->stat.bklog_u);
1845 }
1846
1847 /**
1848 * xs_tcp_print_stats - display TCP socket-specifc stats
1849 * @xprt: rpc_xprt struct containing statistics
1850 * @seq: output file
1851 *
1852 */
1853 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1854 {
1855 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1856 long idle_time = 0;
1857
1858 if (xprt_connected(xprt))
1859 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1860
1861 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1862 transport->port,
1863 xprt->stat.bind_count,
1864 xprt->stat.connect_count,
1865 xprt->stat.connect_time,
1866 idle_time,
1867 xprt->stat.sends,
1868 xprt->stat.recvs,
1869 xprt->stat.bad_xids,
1870 xprt->stat.req_u,
1871 xprt->stat.bklog_u);
1872 }
1873
1874 static struct rpc_xprt_ops xs_udp_ops = {
1875 .set_buffer_size = xs_udp_set_buffer_size,
1876 .reserve_xprt = xprt_reserve_xprt_cong,
1877 .release_xprt = xprt_release_xprt_cong,
1878 .rpcbind = rpcb_getport_async,
1879 .set_port = xs_set_port,
1880 .connect = xs_connect,
1881 .buf_alloc = rpc_malloc,
1882 .buf_free = rpc_free,
1883 .send_request = xs_udp_send_request,
1884 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1885 .timer = xs_udp_timer,
1886 .release_request = xprt_release_rqst_cong,
1887 .close = xs_close,
1888 .destroy = xs_destroy,
1889 .print_stats = xs_udp_print_stats,
1890 };
1891
1892 static struct rpc_xprt_ops xs_tcp_ops = {
1893 .reserve_xprt = xprt_reserve_xprt,
1894 .release_xprt = xs_tcp_release_xprt,
1895 .rpcbind = rpcb_getport_async,
1896 .set_port = xs_set_port,
1897 .connect = xs_tcp_connect,
1898 .buf_alloc = rpc_malloc,
1899 .buf_free = rpc_free,
1900 .send_request = xs_tcp_send_request,
1901 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1902 .close = xs_tcp_shutdown,
1903 .destroy = xs_destroy,
1904 .print_stats = xs_tcp_print_stats,
1905 };
1906
1907 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1908 unsigned int slot_table_size)
1909 {
1910 struct rpc_xprt *xprt;
1911 struct sock_xprt *new;
1912
1913 if (args->addrlen > sizeof(xprt->addr)) {
1914 dprintk("RPC: xs_setup_xprt: address too large\n");
1915 return ERR_PTR(-EBADF);
1916 }
1917
1918 new = kzalloc(sizeof(*new), GFP_KERNEL);
1919 if (new == NULL) {
1920 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1921 "rpc_xprt\n");
1922 return ERR_PTR(-ENOMEM);
1923 }
1924 xprt = &new->xprt;
1925
1926 xprt->max_reqs = slot_table_size;
1927 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1928 if (xprt->slot == NULL) {
1929 kfree(xprt);
1930 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1931 "table\n");
1932 return ERR_PTR(-ENOMEM);
1933 }
1934
1935 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1936 xprt->addrlen = args->addrlen;
1937 if (args->srcaddr)
1938 memcpy(&new->addr, args->srcaddr, args->addrlen);
1939
1940 return xprt;
1941 }
1942
1943 static const struct rpc_timeout xs_udp_default_timeout = {
1944 .to_initval = 5 * HZ,
1945 .to_maxval = 30 * HZ,
1946 .to_increment = 5 * HZ,
1947 .to_retries = 5,
1948 };
1949
1950 /**
1951 * xs_setup_udp - Set up transport to use a UDP socket
1952 * @args: rpc transport creation arguments
1953 *
1954 */
1955 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1956 {
1957 struct sockaddr *addr = args->dstaddr;
1958 struct rpc_xprt *xprt;
1959 struct sock_xprt *transport;
1960
1961 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1962 if (IS_ERR(xprt))
1963 return xprt;
1964 transport = container_of(xprt, struct sock_xprt, xprt);
1965
1966 xprt->prot = IPPROTO_UDP;
1967 xprt->tsh_size = 0;
1968 /* XXX: header size can vary due to auth type, IPv6, etc. */
1969 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1970
1971 xprt->bind_timeout = XS_BIND_TO;
1972 xprt->connect_timeout = XS_UDP_CONN_TO;
1973 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1974 xprt->idle_timeout = XS_IDLE_DISC_TO;
1975
1976 xprt->ops = &xs_udp_ops;
1977
1978 xprt->timeout = &xs_udp_default_timeout;
1979
1980 switch (addr->sa_family) {
1981 case AF_INET:
1982 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1983 xprt_set_bound(xprt);
1984
1985 INIT_DELAYED_WORK(&transport->connect_worker,
1986 xs_udp_connect_worker4);
1987 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1988 break;
1989 case AF_INET6:
1990 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1991 xprt_set_bound(xprt);
1992
1993 INIT_DELAYED_WORK(&transport->connect_worker,
1994 xs_udp_connect_worker6);
1995 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1996 break;
1997 default:
1998 kfree(xprt);
1999 return ERR_PTR(-EAFNOSUPPORT);
2000 }
2001
2002 dprintk("RPC: set up transport to address %s\n",
2003 xprt->address_strings[RPC_DISPLAY_ALL]);
2004
2005 if (try_module_get(THIS_MODULE))
2006 return xprt;
2007
2008 kfree(xprt->slot);
2009 kfree(xprt);
2010 return ERR_PTR(-EINVAL);
2011 }
2012
2013 static const struct rpc_timeout xs_tcp_default_timeout = {
2014 .to_initval = 60 * HZ,
2015 .to_maxval = 60 * HZ,
2016 .to_retries = 2,
2017 };
2018
2019 /**
2020 * xs_setup_tcp - Set up transport to use a TCP socket
2021 * @args: rpc transport creation arguments
2022 *
2023 */
2024 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2025 {
2026 struct sockaddr *addr = args->dstaddr;
2027 struct rpc_xprt *xprt;
2028 struct sock_xprt *transport;
2029
2030 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2031 if (IS_ERR(xprt))
2032 return xprt;
2033 transport = container_of(xprt, struct sock_xprt, xprt);
2034
2035 xprt->prot = IPPROTO_TCP;
2036 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2037 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2038
2039 xprt->bind_timeout = XS_BIND_TO;
2040 xprt->connect_timeout = XS_TCP_CONN_TO;
2041 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2042 xprt->idle_timeout = XS_IDLE_DISC_TO;
2043
2044 xprt->ops = &xs_tcp_ops;
2045 xprt->timeout = &xs_tcp_default_timeout;
2046
2047 switch (addr->sa_family) {
2048 case AF_INET:
2049 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2050 xprt_set_bound(xprt);
2051
2052 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2053 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2054 break;
2055 case AF_INET6:
2056 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2057 xprt_set_bound(xprt);
2058
2059 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2060 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2061 break;
2062 default:
2063 kfree(xprt);
2064 return ERR_PTR(-EAFNOSUPPORT);
2065 }
2066
2067 dprintk("RPC: set up transport to address %s\n",
2068 xprt->address_strings[RPC_DISPLAY_ALL]);
2069
2070 if (try_module_get(THIS_MODULE))
2071 return xprt;
2072
2073 kfree(xprt->slot);
2074 kfree(xprt);
2075 return ERR_PTR(-EINVAL);
2076 }
2077
2078 static struct xprt_class xs_udp_transport = {
2079 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2080 .name = "udp",
2081 .owner = THIS_MODULE,
2082 .ident = IPPROTO_UDP,
2083 .setup = xs_setup_udp,
2084 };
2085
2086 static struct xprt_class xs_tcp_transport = {
2087 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2088 .name = "tcp",
2089 .owner = THIS_MODULE,
2090 .ident = IPPROTO_TCP,
2091 .setup = xs_setup_tcp,
2092 };
2093
2094 /**
2095 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2096 *
2097 */
2098 int init_socket_xprt(void)
2099 {
2100 #ifdef RPC_DEBUG
2101 if (!sunrpc_table_header)
2102 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2103 #endif
2104
2105 xprt_register_transport(&xs_udp_transport);
2106 xprt_register_transport(&xs_tcp_transport);
2107
2108 return 0;
2109 }
2110
2111 /**
2112 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2113 *
2114 */
2115 void cleanup_socket_xprt(void)
2116 {
2117 #ifdef RPC_DEBUG
2118 if (sunrpc_table_header) {
2119 unregister_sysctl_table(sunrpc_table_header);
2120 sunrpc_table_header = NULL;
2121 }
2122 #endif
2123
2124 xprt_unregister_transport(&xs_udp_transport);
2125 xprt_unregister_transport(&xs_tcp_transport);
2126 }
linux 2.6 git repository for openrd