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Merge branch 'topic/jack-mechanical' into to-push
[deliverable/linux.git] / net / sunrpc / xprtsock.c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44 * xprtsock tunables
45 */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
56 *
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
59 */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
73 */
74 static ctl_table xs_tunables_table[] = {
75 {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
80 .mode = 0644,
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
85 },
86 {
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
91 .mode = 0644,
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
107 },
108 {
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .ctl_name = 0,
121 },
122 };
123
124 static ctl_table sunrpc_table[] = {
125 {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
128 .mode = 0555,
129 .child = xs_tunables_table
130 },
131 {
132 .ctl_name = 0,
133 },
134 };
135
136 #endif
137
138 /*
139 * Time out for an RPC UDP socket connect. UDP socket connects are
140 * synchronous, but we set a timeout anyway in case of resource
141 * exhaustion on the local host.
142 */
143 #define XS_UDP_CONN_TO (5U * HZ)
144
145 /*
146 * Wait duration for an RPC TCP connection to be established. Solaris
147 * NFS over TCP uses 60 seconds, for example, which is in line with how
148 * long a server takes to reboot.
149 */
150 #define XS_TCP_CONN_TO (60U * HZ)
151
152 /*
153 * Wait duration for a reply from the RPC portmapper.
154 */
155 #define XS_BIND_TO (60U * HZ)
156
157 /*
158 * Delay if a UDP socket connect error occurs. This is most likely some
159 * kind of resource problem on the local host.
160 */
161 #define XS_UDP_REEST_TO (2U * HZ)
162
163 /*
164 * The reestablish timeout allows clients to delay for a bit before attempting
165 * to reconnect to a server that just dropped our connection.
166 *
167 * We implement an exponential backoff when trying to reestablish a TCP
168 * transport connection with the server. Some servers like to drop a TCP
169 * connection when they are overworked, so we start with a short timeout and
170 * increase over time if the server is down or not responding.
171 */
172 #define XS_TCP_INIT_REEST_TO (3U * HZ)
173 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
174
175 /*
176 * TCP idle timeout; client drops the transport socket if it is idle
177 * for this long. Note that we also timeout UDP sockets to prevent
178 * holding port numbers when there is no RPC traffic.
179 */
180 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
181
182 #ifdef RPC_DEBUG
183 # undef RPC_DEBUG_DATA
184 # define RPCDBG_FACILITY RPCDBG_TRANS
185 #endif
186
187 #ifdef RPC_DEBUG_DATA
188 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
189 {
190 u8 *buf = (u8 *) packet;
191 int j;
192
193 dprintk("RPC: %s\n", msg);
194 for (j = 0; j < count && j < 128; j += 4) {
195 if (!(j & 31)) {
196 if (j)
197 dprintk("\n");
198 dprintk("0x%04x ", j);
199 }
200 dprintk("%02x%02x%02x%02x ",
201 buf[j], buf[j+1], buf[j+2], buf[j+3]);
202 }
203 dprintk("\n");
204 }
205 #else
206 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
207 {
208 /* NOP */
209 }
210 #endif
211
212 struct sock_xprt {
213 struct rpc_xprt xprt;
214
215 /*
216 * Network layer
217 */
218 struct socket * sock;
219 struct sock * inet;
220
221 /*
222 * State of TCP reply receive
223 */
224 __be32 tcp_fraghdr,
225 tcp_xid;
226
227 u32 tcp_offset,
228 tcp_reclen;
229
230 unsigned long tcp_copied,
231 tcp_flags;
232
233 /*
234 * Connection of transports
235 */
236 struct delayed_work connect_worker;
237 struct sockaddr_storage addr;
238 unsigned short port;
239
240 /*
241 * UDP socket buffer size parameters
242 */
243 size_t rcvsize,
244 sndsize;
245
246 /*
247 * Saved socket callback addresses
248 */
249 void (*old_data_ready)(struct sock *, int);
250 void (*old_state_change)(struct sock *);
251 void (*old_write_space)(struct sock *);
252 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, NIPQUAD_FMT,
288 NIPQUAD(addr->sin_addr.s_addr));
289 }
290 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
291
292 buf = kzalloc(8, GFP_KERNEL);
293 if (buf) {
294 snprintf(buf, 8, "%u",
295 ntohs(addr->sin_port));
296 }
297 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
298
299 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
300
301 buf = kzalloc(48, GFP_KERNEL);
302 if (buf) {
303 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
304 NIPQUAD(addr->sin_addr.s_addr),
305 ntohs(addr->sin_port),
306 protocol);
307 }
308 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
309
310 buf = kzalloc(10, GFP_KERNEL);
311 if (buf) {
312 snprintf(buf, 10, "%02x%02x%02x%02x",
313 NIPQUAD(addr->sin_addr.s_addr));
314 }
315 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
316
317 buf = kzalloc(8, GFP_KERNEL);
318 if (buf) {
319 snprintf(buf, 8, "%4hx",
320 ntohs(addr->sin_port));
321 }
322 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
323
324 buf = kzalloc(30, GFP_KERNEL);
325 if (buf) {
326 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
327 NIPQUAD(addr->sin_addr.s_addr),
328 ntohs(addr->sin_port) >> 8,
329 ntohs(addr->sin_port) & 0xff);
330 }
331 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
332
333 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
334 }
335
336 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
337 const char *protocol,
338 const char *netid)
339 {
340 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
341 char *buf;
342
343 buf = kzalloc(40, GFP_KERNEL);
344 if (buf) {
345 snprintf(buf, 40, NIP6_FMT,
346 NIP6(addr->sin6_addr));
347 }
348 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
349
350 buf = kzalloc(8, GFP_KERNEL);
351 if (buf) {
352 snprintf(buf, 8, "%u",
353 ntohs(addr->sin6_port));
354 }
355 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
356
357 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
358
359 buf = kzalloc(64, GFP_KERNEL);
360 if (buf) {
361 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
362 NIP6(addr->sin6_addr),
363 ntohs(addr->sin6_port),
364 protocol);
365 }
366 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
367
368 buf = kzalloc(36, GFP_KERNEL);
369 if (buf) {
370 snprintf(buf, 36, NIP6_SEQFMT,
371 NIP6(addr->sin6_addr));
372 }
373 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
374
375 buf = kzalloc(8, GFP_KERNEL);
376 if (buf) {
377 snprintf(buf, 8, "%4hx",
378 ntohs(addr->sin6_port));
379 }
380 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
381
382 buf = kzalloc(50, GFP_KERNEL);
383 if (buf) {
384 snprintf(buf, 50, NIP6_FMT".%u.%u",
385 NIP6(addr->sin6_addr),
386 ntohs(addr->sin6_port) >> 8,
387 ntohs(addr->sin6_port) & 0xff);
388 }
389 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
390
391 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
392 }
393
394 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
395 {
396 unsigned int i;
397
398 for (i = 0; i < RPC_DISPLAY_MAX; i++)
399 switch (i) {
400 case RPC_DISPLAY_PROTO:
401 case RPC_DISPLAY_NETID:
402 continue;
403 default:
404 kfree(xprt->address_strings[i]);
405 }
406 }
407
408 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
409
410 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
411 {
412 struct msghdr msg = {
413 .msg_name = addr,
414 .msg_namelen = addrlen,
415 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
416 };
417 struct kvec iov = {
418 .iov_base = vec->iov_base + base,
419 .iov_len = vec->iov_len - base,
420 };
421
422 if (iov.iov_len != 0)
423 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
424 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
425 }
426
427 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
428 {
429 struct page **ppage;
430 unsigned int remainder;
431 int err, sent = 0;
432
433 remainder = xdr->page_len - base;
434 base += xdr->page_base;
435 ppage = xdr->pages + (base >> PAGE_SHIFT);
436 base &= ~PAGE_MASK;
437 for(;;) {
438 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
439 int flags = XS_SENDMSG_FLAGS;
440
441 remainder -= len;
442 if (remainder != 0 || more)
443 flags |= MSG_MORE;
444 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
445 if (remainder == 0 || err != len)
446 break;
447 sent += err;
448 ppage++;
449 base = 0;
450 }
451 if (sent == 0)
452 return err;
453 if (err > 0)
454 sent += err;
455 return sent;
456 }
457
458 /**
459 * xs_sendpages - write pages directly to a socket
460 * @sock: socket to send on
461 * @addr: UDP only -- address of destination
462 * @addrlen: UDP only -- length of destination address
463 * @xdr: buffer containing this request
464 * @base: starting position in the buffer
465 *
466 */
467 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
468 {
469 unsigned int remainder = xdr->len - base;
470 int err, sent = 0;
471
472 if (unlikely(!sock))
473 return -ENOTCONN;
474
475 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
476 if (base != 0) {
477 addr = NULL;
478 addrlen = 0;
479 }
480
481 if (base < xdr->head[0].iov_len || addr != NULL) {
482 unsigned int len = xdr->head[0].iov_len - base;
483 remainder -= len;
484 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
485 if (remainder == 0 || err != len)
486 goto out;
487 sent += err;
488 base = 0;
489 } else
490 base -= xdr->head[0].iov_len;
491
492 if (base < xdr->page_len) {
493 unsigned int len = xdr->page_len - base;
494 remainder -= len;
495 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
496 if (remainder == 0 || err != len)
497 goto out;
498 sent += err;
499 base = 0;
500 } else
501 base -= xdr->page_len;
502
503 if (base >= xdr->tail[0].iov_len)
504 return sent;
505 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
506 out:
507 if (sent == 0)
508 return err;
509 if (err > 0)
510 sent += err;
511 return sent;
512 }
513
514 static void xs_nospace_callback(struct rpc_task *task)
515 {
516 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
517
518 transport->inet->sk_write_pending--;
519 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
520 }
521
522 /**
523 * xs_nospace - place task on wait queue if transmit was incomplete
524 * @task: task to put to sleep
525 *
526 */
527 static void xs_nospace(struct rpc_task *task)
528 {
529 struct rpc_rqst *req = task->tk_rqstp;
530 struct rpc_xprt *xprt = req->rq_xprt;
531 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
532
533 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
534 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
535 req->rq_slen);
536
537 /* Protect against races with write_space */
538 spin_lock_bh(&xprt->transport_lock);
539
540 /* Don't race with disconnect */
541 if (xprt_connected(xprt)) {
542 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
543 /*
544 * Notify TCP that we're limited by the application
545 * window size
546 */
547 set_bit(SOCK_NOSPACE, &transport->sock->flags);
548 transport->inet->sk_write_pending++;
549 /* ...and wait for more buffer space */
550 xprt_wait_for_buffer_space(task, xs_nospace_callback);
551 }
552 } else {
553 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
554 task->tk_status = -ENOTCONN;
555 }
556
557 spin_unlock_bh(&xprt->transport_lock);
558 }
559
560 /**
561 * xs_udp_send_request - write an RPC request to a UDP socket
562 * @task: address of RPC task that manages the state of an RPC request
563 *
564 * Return values:
565 * 0: The request has been sent
566 * EAGAIN: The socket was blocked, please call again later to
567 * complete the request
568 * ENOTCONN: Caller needs to invoke connect logic then call again
569 * other: Some other error occured, the request was not sent
570 */
571 static int xs_udp_send_request(struct rpc_task *task)
572 {
573 struct rpc_rqst *req = task->tk_rqstp;
574 struct rpc_xprt *xprt = req->rq_xprt;
575 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
576 struct xdr_buf *xdr = &req->rq_snd_buf;
577 int status;
578
579 xs_pktdump("packet data:",
580 req->rq_svec->iov_base,
581 req->rq_svec->iov_len);
582
583 status = xs_sendpages(transport->sock,
584 xs_addr(xprt),
585 xprt->addrlen, xdr,
586 req->rq_bytes_sent);
587
588 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
589 xdr->len - req->rq_bytes_sent, status);
590
591 if (status >= 0) {
592 task->tk_bytes_sent += status;
593 if (status >= req->rq_slen)
594 return 0;
595 /* Still some bytes left; set up for a retry later. */
596 status = -EAGAIN;
597 }
598
599 switch (status) {
600 case -EAGAIN:
601 xs_nospace(task);
602 break;
603 case -ENETUNREACH:
604 case -EPIPE:
605 case -ECONNREFUSED:
606 /* When the server has died, an ICMP port unreachable message
607 * prompts ECONNREFUSED. */
608 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
609 break;
610 default:
611 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
612 dprintk("RPC: sendmsg returned unrecognized error %d\n",
613 -status);
614 }
615
616 return status;
617 }
618
619 /**
620 * xs_tcp_shutdown - gracefully shut down a TCP socket
621 * @xprt: transport
622 *
623 * Initiates a graceful shutdown of the TCP socket by calling the
624 * equivalent of shutdown(SHUT_WR);
625 */
626 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
627 {
628 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
629 struct socket *sock = transport->sock;
630
631 if (sock != NULL)
632 kernel_sock_shutdown(sock, SHUT_WR);
633 }
634
635 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
636 {
637 u32 reclen = buf->len - sizeof(rpc_fraghdr);
638 rpc_fraghdr *base = buf->head[0].iov_base;
639 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
640 }
641
642 /**
643 * xs_tcp_send_request - write an RPC request to a TCP socket
644 * @task: address of RPC task that manages the state of an RPC request
645 *
646 * Return values:
647 * 0: The request has been sent
648 * EAGAIN: The socket was blocked, please call again later to
649 * complete the request
650 * ENOTCONN: Caller needs to invoke connect logic then call again
651 * other: Some other error occured, the request was not sent
652 *
653 * XXX: In the case of soft timeouts, should we eventually give up
654 * if sendmsg is not able to make progress?
655 */
656 static int xs_tcp_send_request(struct rpc_task *task)
657 {
658 struct rpc_rqst *req = task->tk_rqstp;
659 struct rpc_xprt *xprt = req->rq_xprt;
660 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
661 struct xdr_buf *xdr = &req->rq_snd_buf;
662 int status;
663
664 xs_encode_tcp_record_marker(&req->rq_snd_buf);
665
666 xs_pktdump("packet data:",
667 req->rq_svec->iov_base,
668 req->rq_svec->iov_len);
669
670 /* Continue transmitting the packet/record. We must be careful
671 * to cope with writespace callbacks arriving _after_ we have
672 * called sendmsg(). */
673 while (1) {
674 status = xs_sendpages(transport->sock,
675 NULL, 0, xdr, req->rq_bytes_sent);
676
677 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
678 xdr->len - req->rq_bytes_sent, status);
679
680 if (unlikely(status < 0))
681 break;
682
683 /* If we've sent the entire packet, immediately
684 * reset the count of bytes sent. */
685 req->rq_bytes_sent += status;
686 task->tk_bytes_sent += status;
687 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
688 req->rq_bytes_sent = 0;
689 return 0;
690 }
691
692 if (status != 0)
693 continue;
694 status = -EAGAIN;
695 break;
696 }
697
698 switch (status) {
699 case -EAGAIN:
700 xs_nospace(task);
701 break;
702 case -ECONNRESET:
703 xs_tcp_shutdown(xprt);
704 case -ECONNREFUSED:
705 case -ENOTCONN:
706 case -EPIPE:
707 status = -ENOTCONN;
708 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
709 break;
710 default:
711 dprintk("RPC: sendmsg returned unrecognized error %d\n",
712 -status);
713 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
714 xs_tcp_shutdown(xprt);
715 }
716
717 return status;
718 }
719
720 /**
721 * xs_tcp_release_xprt - clean up after a tcp transmission
722 * @xprt: transport
723 * @task: rpc task
724 *
725 * This cleans up if an error causes us to abort the transmission of a request.
726 * In this case, the socket may need to be reset in order to avoid confusing
727 * the server.
728 */
729 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
730 {
731 struct rpc_rqst *req;
732
733 if (task != xprt->snd_task)
734 return;
735 if (task == NULL)
736 goto out_release;
737 req = task->tk_rqstp;
738 if (req->rq_bytes_sent == 0)
739 goto out_release;
740 if (req->rq_bytes_sent == req->rq_snd_buf.len)
741 goto out_release;
742 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
743 out_release:
744 xprt_release_xprt(xprt, task);
745 }
746
747 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
748 {
749 transport->old_data_ready = sk->sk_data_ready;
750 transport->old_state_change = sk->sk_state_change;
751 transport->old_write_space = sk->sk_write_space;
752 transport->old_error_report = sk->sk_error_report;
753 }
754
755 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
756 {
757 sk->sk_data_ready = transport->old_data_ready;
758 sk->sk_state_change = transport->old_state_change;
759 sk->sk_write_space = transport->old_write_space;
760 sk->sk_error_report = transport->old_error_report;
761 }
762
763 /**
764 * xs_close - close a socket
765 * @xprt: transport
766 *
767 * This is used when all requests are complete; ie, no DRC state remains
768 * on the server we want to save.
769 */
770 static void xs_close(struct rpc_xprt *xprt)
771 {
772 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
773 struct socket *sock = transport->sock;
774 struct sock *sk = transport->inet;
775
776 if (!sk)
777 goto clear_close_wait;
778
779 dprintk("RPC: xs_close xprt %p\n", xprt);
780
781 write_lock_bh(&sk->sk_callback_lock);
782 transport->inet = NULL;
783 transport->sock = NULL;
784
785 sk->sk_user_data = NULL;
786
787 xs_restore_old_callbacks(transport, sk);
788 write_unlock_bh(&sk->sk_callback_lock);
789
790 sk->sk_no_check = 0;
791
792 sock_release(sock);
793 clear_close_wait:
794 smp_mb__before_clear_bit();
795 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
796 clear_bit(XPRT_CLOSING, &xprt->state);
797 smp_mb__after_clear_bit();
798 xprt_disconnect_done(xprt);
799 }
800
801 /**
802 * xs_destroy - prepare to shutdown a transport
803 * @xprt: doomed transport
804 *
805 */
806 static void xs_destroy(struct rpc_xprt *xprt)
807 {
808 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
809
810 dprintk("RPC: xs_destroy xprt %p\n", xprt);
811
812 cancel_rearming_delayed_work(&transport->connect_worker);
813
814 xs_close(xprt);
815 xs_free_peer_addresses(xprt);
816 kfree(xprt->slot);
817 kfree(xprt);
818 module_put(THIS_MODULE);
819 }
820
821 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
822 {
823 return (struct rpc_xprt *) sk->sk_user_data;
824 }
825
826 /**
827 * xs_udp_data_ready - "data ready" callback for UDP sockets
828 * @sk: socket with data to read
829 * @len: how much data to read
830 *
831 */
832 static void xs_udp_data_ready(struct sock *sk, int len)
833 {
834 struct rpc_task *task;
835 struct rpc_xprt *xprt;
836 struct rpc_rqst *rovr;
837 struct sk_buff *skb;
838 int err, repsize, copied;
839 u32 _xid;
840 __be32 *xp;
841
842 read_lock(&sk->sk_callback_lock);
843 dprintk("RPC: xs_udp_data_ready...\n");
844 if (!(xprt = xprt_from_sock(sk)))
845 goto out;
846
847 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
848 goto out;
849
850 if (xprt->shutdown)
851 goto dropit;
852
853 repsize = skb->len - sizeof(struct udphdr);
854 if (repsize < 4) {
855 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
856 goto dropit;
857 }
858
859 /* Copy the XID from the skb... */
860 xp = skb_header_pointer(skb, sizeof(struct udphdr),
861 sizeof(_xid), &_xid);
862 if (xp == NULL)
863 goto dropit;
864
865 /* Look up and lock the request corresponding to the given XID */
866 spin_lock(&xprt->transport_lock);
867 rovr = xprt_lookup_rqst(xprt, *xp);
868 if (!rovr)
869 goto out_unlock;
870 task = rovr->rq_task;
871
872 if ((copied = rovr->rq_private_buf.buflen) > repsize)
873 copied = repsize;
874
875 /* Suck it into the iovec, verify checksum if not done by hw. */
876 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
877 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
878 goto out_unlock;
879 }
880
881 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
882
883 /* Something worked... */
884 dst_confirm(skb->dst);
885
886 xprt_adjust_cwnd(task, copied);
887 xprt_update_rtt(task);
888 xprt_complete_rqst(task, copied);
889
890 out_unlock:
891 spin_unlock(&xprt->transport_lock);
892 dropit:
893 skb_free_datagram(sk, skb);
894 out:
895 read_unlock(&sk->sk_callback_lock);
896 }
897
898 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
899 {
900 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
901 size_t len, used;
902 char *p;
903
904 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
905 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
906 used = xdr_skb_read_bits(desc, p, len);
907 transport->tcp_offset += used;
908 if (used != len)
909 return;
910
911 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
912 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
913 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
914 else
915 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
916 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
917
918 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
919 transport->tcp_offset = 0;
920
921 /* Sanity check of the record length */
922 if (unlikely(transport->tcp_reclen < 4)) {
923 dprintk("RPC: invalid TCP record fragment length\n");
924 xprt_force_disconnect(xprt);
925 return;
926 }
927 dprintk("RPC: reading TCP record fragment of length %d\n",
928 transport->tcp_reclen);
929 }
930
931 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
932 {
933 if (transport->tcp_offset == transport->tcp_reclen) {
934 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
935 transport->tcp_offset = 0;
936 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
937 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
938 transport->tcp_flags |= TCP_RCV_COPY_XID;
939 transport->tcp_copied = 0;
940 }
941 }
942 }
943
944 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
945 {
946 size_t len, used;
947 char *p;
948
949 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
950 dprintk("RPC: reading XID (%Zu bytes)\n", len);
951 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
952 used = xdr_skb_read_bits(desc, p, len);
953 transport->tcp_offset += used;
954 if (used != len)
955 return;
956 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
957 transport->tcp_flags |= TCP_RCV_COPY_DATA;
958 transport->tcp_copied = 4;
959 dprintk("RPC: reading reply for XID %08x\n",
960 ntohl(transport->tcp_xid));
961 xs_tcp_check_fraghdr(transport);
962 }
963
964 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
965 {
966 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
967 struct rpc_rqst *req;
968 struct xdr_buf *rcvbuf;
969 size_t len;
970 ssize_t r;
971
972 /* Find and lock the request corresponding to this xid */
973 spin_lock(&xprt->transport_lock);
974 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
975 if (!req) {
976 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
977 dprintk("RPC: XID %08x request not found!\n",
978 ntohl(transport->tcp_xid));
979 spin_unlock(&xprt->transport_lock);
980 return;
981 }
982
983 rcvbuf = &req->rq_private_buf;
984 len = desc->count;
985 if (len > transport->tcp_reclen - transport->tcp_offset) {
986 struct xdr_skb_reader my_desc;
987
988 len = transport->tcp_reclen - transport->tcp_offset;
989 memcpy(&my_desc, desc, sizeof(my_desc));
990 my_desc.count = len;
991 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
992 &my_desc, xdr_skb_read_bits);
993 desc->count -= r;
994 desc->offset += r;
995 } else
996 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
997 desc, xdr_skb_read_bits);
998
999 if (r > 0) {
1000 transport->tcp_copied += r;
1001 transport->tcp_offset += r;
1002 }
1003 if (r != len) {
1004 /* Error when copying to the receive buffer,
1005 * usually because we weren't able to allocate
1006 * additional buffer pages. All we can do now
1007 * is turn off TCP_RCV_COPY_DATA, so the request
1008 * will not receive any additional updates,
1009 * and time out.
1010 * Any remaining data from this record will
1011 * be discarded.
1012 */
1013 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1014 dprintk("RPC: XID %08x truncated request\n",
1015 ntohl(transport->tcp_xid));
1016 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1017 "tcp_offset = %u, tcp_reclen = %u\n",
1018 xprt, transport->tcp_copied,
1019 transport->tcp_offset, transport->tcp_reclen);
1020 goto out;
1021 }
1022
1023 dprintk("RPC: XID %08x read %Zd bytes\n",
1024 ntohl(transport->tcp_xid), r);
1025 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1026 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1027 transport->tcp_offset, transport->tcp_reclen);
1028
1029 if (transport->tcp_copied == req->rq_private_buf.buflen)
1030 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1031 else if (transport->tcp_offset == transport->tcp_reclen) {
1032 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1033 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1034 }
1035
1036 out:
1037 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1038 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1039 spin_unlock(&xprt->transport_lock);
1040 xs_tcp_check_fraghdr(transport);
1041 }
1042
1043 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1044 {
1045 size_t len;
1046
1047 len = transport->tcp_reclen - transport->tcp_offset;
1048 if (len > desc->count)
1049 len = desc->count;
1050 desc->count -= len;
1051 desc->offset += len;
1052 transport->tcp_offset += len;
1053 dprintk("RPC: discarded %Zu bytes\n", len);
1054 xs_tcp_check_fraghdr(transport);
1055 }
1056
1057 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1058 {
1059 struct rpc_xprt *xprt = rd_desc->arg.data;
1060 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1061 struct xdr_skb_reader desc = {
1062 .skb = skb,
1063 .offset = offset,
1064 .count = len,
1065 };
1066
1067 dprintk("RPC: xs_tcp_data_recv started\n");
1068 do {
1069 /* Read in a new fragment marker if necessary */
1070 /* Can we ever really expect to get completely empty fragments? */
1071 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1072 xs_tcp_read_fraghdr(xprt, &desc);
1073 continue;
1074 }
1075 /* Read in the xid if necessary */
1076 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1077 xs_tcp_read_xid(transport, &desc);
1078 continue;
1079 }
1080 /* Read in the request data */
1081 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1082 xs_tcp_read_request(xprt, &desc);
1083 continue;
1084 }
1085 /* Skip over any trailing bytes on short reads */
1086 xs_tcp_read_discard(transport, &desc);
1087 } while (desc.count);
1088 dprintk("RPC: xs_tcp_data_recv done\n");
1089 return len - desc.count;
1090 }
1091
1092 /**
1093 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1094 * @sk: socket with data to read
1095 * @bytes: how much data to read
1096 *
1097 */
1098 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1099 {
1100 struct rpc_xprt *xprt;
1101 read_descriptor_t rd_desc;
1102 int read;
1103
1104 dprintk("RPC: xs_tcp_data_ready...\n");
1105
1106 read_lock(&sk->sk_callback_lock);
1107 if (!(xprt = xprt_from_sock(sk)))
1108 goto out;
1109 if (xprt->shutdown)
1110 goto out;
1111
1112 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1113 rd_desc.arg.data = xprt;
1114 do {
1115 rd_desc.count = 65536;
1116 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1117 } while (read > 0);
1118 out:
1119 read_unlock(&sk->sk_callback_lock);
1120 }
1121
1122 /**
1123 * xs_tcp_state_change - callback to handle TCP socket state changes
1124 * @sk: socket whose state has changed
1125 *
1126 */
1127 static void xs_tcp_state_change(struct sock *sk)
1128 {
1129 struct rpc_xprt *xprt;
1130
1131 read_lock(&sk->sk_callback_lock);
1132 if (!(xprt = xprt_from_sock(sk)))
1133 goto out;
1134 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1135 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1136 sk->sk_state, xprt_connected(xprt),
1137 sock_flag(sk, SOCK_DEAD),
1138 sock_flag(sk, SOCK_ZAPPED));
1139
1140 switch (sk->sk_state) {
1141 case TCP_ESTABLISHED:
1142 spin_lock_bh(&xprt->transport_lock);
1143 if (!xprt_test_and_set_connected(xprt)) {
1144 struct sock_xprt *transport = container_of(xprt,
1145 struct sock_xprt, xprt);
1146
1147 /* Reset TCP record info */
1148 transport->tcp_offset = 0;
1149 transport->tcp_reclen = 0;
1150 transport->tcp_copied = 0;
1151 transport->tcp_flags =
1152 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1153
1154 xprt_wake_pending_tasks(xprt, 0);
1155 }
1156 spin_unlock_bh(&xprt->transport_lock);
1157 break;
1158 case TCP_FIN_WAIT1:
1159 /* The client initiated a shutdown of the socket */
1160 xprt->connect_cookie++;
1161 xprt->reestablish_timeout = 0;
1162 set_bit(XPRT_CLOSING, &xprt->state);
1163 smp_mb__before_clear_bit();
1164 clear_bit(XPRT_CONNECTED, &xprt->state);
1165 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1166 smp_mb__after_clear_bit();
1167 break;
1168 case TCP_CLOSE_WAIT:
1169 /* The server initiated a shutdown of the socket */
1170 set_bit(XPRT_CLOSING, &xprt->state);
1171 xprt_force_disconnect(xprt);
1172 case TCP_SYN_SENT:
1173 xprt->connect_cookie++;
1174 case TCP_CLOSING:
1175 /*
1176 * If the server closed down the connection, make sure that
1177 * we back off before reconnecting
1178 */
1179 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1180 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1181 break;
1182 case TCP_LAST_ACK:
1183 smp_mb__before_clear_bit();
1184 clear_bit(XPRT_CONNECTED, &xprt->state);
1185 smp_mb__after_clear_bit();
1186 break;
1187 case TCP_CLOSE:
1188 smp_mb__before_clear_bit();
1189 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1190 clear_bit(XPRT_CLOSING, &xprt->state);
1191 smp_mb__after_clear_bit();
1192 /* Mark transport as closed and wake up all pending tasks */
1193 xprt_disconnect_done(xprt);
1194 }
1195 out:
1196 read_unlock(&sk->sk_callback_lock);
1197 }
1198
1199 /**
1200 * xs_tcp_error_report - callback mainly for catching RST events
1201 * @sk: socket
1202 */
1203 static void xs_tcp_error_report(struct sock *sk)
1204 {
1205 struct rpc_xprt *xprt;
1206
1207 read_lock(&sk->sk_callback_lock);
1208 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1209 goto out;
1210 if (!(xprt = xprt_from_sock(sk)))
1211 goto out;
1212 dprintk("RPC: %s client %p...\n"
1213 "RPC: error %d\n",
1214 __func__, xprt, sk->sk_err);
1215
1216 xprt_force_disconnect(xprt);
1217 out:
1218 read_unlock(&sk->sk_callback_lock);
1219 }
1220
1221 /**
1222 * xs_udp_write_space - callback invoked when socket buffer space
1223 * becomes available
1224 * @sk: socket whose state has changed
1225 *
1226 * Called when more output buffer space is available for this socket.
1227 * We try not to wake our writers until they can make "significant"
1228 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1229 * with a bunch of small requests.
1230 */
1231 static void xs_udp_write_space(struct sock *sk)
1232 {
1233 read_lock(&sk->sk_callback_lock);
1234
1235 /* from net/core/sock.c:sock_def_write_space */
1236 if (sock_writeable(sk)) {
1237 struct socket *sock;
1238 struct rpc_xprt *xprt;
1239
1240 if (unlikely(!(sock = sk->sk_socket)))
1241 goto out;
1242 clear_bit(SOCK_NOSPACE, &sock->flags);
1243
1244 if (unlikely(!(xprt = xprt_from_sock(sk))))
1245 goto out;
1246 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1247 goto out;
1248
1249 xprt_write_space(xprt);
1250 }
1251
1252 out:
1253 read_unlock(&sk->sk_callback_lock);
1254 }
1255
1256 /**
1257 * xs_tcp_write_space - callback invoked when socket buffer space
1258 * becomes available
1259 * @sk: socket whose state has changed
1260 *
1261 * Called when more output buffer space is available for this socket.
1262 * We try not to wake our writers until they can make "significant"
1263 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1264 * with a bunch of small requests.
1265 */
1266 static void xs_tcp_write_space(struct sock *sk)
1267 {
1268 read_lock(&sk->sk_callback_lock);
1269
1270 /* from net/core/stream.c:sk_stream_write_space */
1271 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1272 struct socket *sock;
1273 struct rpc_xprt *xprt;
1274
1275 if (unlikely(!(sock = sk->sk_socket)))
1276 goto out;
1277 clear_bit(SOCK_NOSPACE, &sock->flags);
1278
1279 if (unlikely(!(xprt = xprt_from_sock(sk))))
1280 goto out;
1281 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1282 goto out;
1283
1284 xprt_write_space(xprt);
1285 }
1286
1287 out:
1288 read_unlock(&sk->sk_callback_lock);
1289 }
1290
1291 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1292 {
1293 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1294 struct sock *sk = transport->inet;
1295
1296 if (transport->rcvsize) {
1297 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1298 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1299 }
1300 if (transport->sndsize) {
1301 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1302 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1303 sk->sk_write_space(sk);
1304 }
1305 }
1306
1307 /**
1308 * xs_udp_set_buffer_size - set send and receive limits
1309 * @xprt: generic transport
1310 * @sndsize: requested size of send buffer, in bytes
1311 * @rcvsize: requested size of receive buffer, in bytes
1312 *
1313 * Set socket send and receive buffer size limits.
1314 */
1315 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1316 {
1317 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1318
1319 transport->sndsize = 0;
1320 if (sndsize)
1321 transport->sndsize = sndsize + 1024;
1322 transport->rcvsize = 0;
1323 if (rcvsize)
1324 transport->rcvsize = rcvsize + 1024;
1325
1326 xs_udp_do_set_buffer_size(xprt);
1327 }
1328
1329 /**
1330 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1331 * @task: task that timed out
1332 *
1333 * Adjust the congestion window after a retransmit timeout has occurred.
1334 */
1335 static void xs_udp_timer(struct rpc_task *task)
1336 {
1337 xprt_adjust_cwnd(task, -ETIMEDOUT);
1338 }
1339
1340 static unsigned short xs_get_random_port(void)
1341 {
1342 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1343 unsigned short rand = (unsigned short) net_random() % range;
1344 return rand + xprt_min_resvport;
1345 }
1346
1347 /**
1348 * xs_set_port - reset the port number in the remote endpoint address
1349 * @xprt: generic transport
1350 * @port: new port number
1351 *
1352 */
1353 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1354 {
1355 struct sockaddr *addr = xs_addr(xprt);
1356
1357 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1358
1359 switch (addr->sa_family) {
1360 case AF_INET:
1361 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1362 break;
1363 case AF_INET6:
1364 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1365 break;
1366 default:
1367 BUG();
1368 }
1369 }
1370
1371 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1372 {
1373 unsigned short port = transport->port;
1374
1375 if (port == 0 && transport->xprt.resvport)
1376 port = xs_get_random_port();
1377 return port;
1378 }
1379
1380 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1381 {
1382 if (transport->port != 0)
1383 transport->port = 0;
1384 if (!transport->xprt.resvport)
1385 return 0;
1386 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1387 return xprt_max_resvport;
1388 return --port;
1389 }
1390
1391 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1392 {
1393 struct sockaddr_in myaddr = {
1394 .sin_family = AF_INET,
1395 };
1396 struct sockaddr_in *sa;
1397 int err, nloop = 0;
1398 unsigned short port = xs_get_srcport(transport, sock);
1399 unsigned short last;
1400
1401 sa = (struct sockaddr_in *)&transport->addr;
1402 myaddr.sin_addr = sa->sin_addr;
1403 do {
1404 myaddr.sin_port = htons(port);
1405 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1406 sizeof(myaddr));
1407 if (port == 0)
1408 break;
1409 if (err == 0) {
1410 transport->port = port;
1411 break;
1412 }
1413 last = port;
1414 port = xs_next_srcport(transport, sock, port);
1415 if (port > last)
1416 nloop++;
1417 } while (err == -EADDRINUSE && nloop != 2);
1418 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1419 __func__, NIPQUAD(myaddr.sin_addr),
1420 port, err ? "failed" : "ok", err);
1421 return err;
1422 }
1423
1424 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1425 {
1426 struct sockaddr_in6 myaddr = {
1427 .sin6_family = AF_INET6,
1428 };
1429 struct sockaddr_in6 *sa;
1430 int err, nloop = 0;
1431 unsigned short port = xs_get_srcport(transport, sock);
1432 unsigned short last;
1433
1434 sa = (struct sockaddr_in6 *)&transport->addr;
1435 myaddr.sin6_addr = sa->sin6_addr;
1436 do {
1437 myaddr.sin6_port = htons(port);
1438 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1439 sizeof(myaddr));
1440 if (port == 0)
1441 break;
1442 if (err == 0) {
1443 transport->port = port;
1444 break;
1445 }
1446 last = port;
1447 port = xs_next_srcport(transport, sock, port);
1448 if (port > last)
1449 nloop++;
1450 } while (err == -EADDRINUSE && nloop != 2);
1451 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1452 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1453 return err;
1454 }
1455
1456 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1457 static struct lock_class_key xs_key[2];
1458 static struct lock_class_key xs_slock_key[2];
1459
1460 static inline void xs_reclassify_socket4(struct socket *sock)
1461 {
1462 struct sock *sk = sock->sk;
1463
1464 BUG_ON(sock_owned_by_user(sk));
1465 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1466 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1467 }
1468
1469 static inline void xs_reclassify_socket6(struct socket *sock)
1470 {
1471 struct sock *sk = sock->sk;
1472
1473 BUG_ON(sock_owned_by_user(sk));
1474 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1475 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1476 }
1477 #else
1478 static inline void xs_reclassify_socket4(struct socket *sock)
1479 {
1480 }
1481
1482 static inline void xs_reclassify_socket6(struct socket *sock)
1483 {
1484 }
1485 #endif
1486
1487 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1488 {
1489 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1490
1491 if (!transport->inet) {
1492 struct sock *sk = sock->sk;
1493
1494 write_lock_bh(&sk->sk_callback_lock);
1495
1496 xs_save_old_callbacks(transport, sk);
1497
1498 sk->sk_user_data = xprt;
1499 sk->sk_data_ready = xs_udp_data_ready;
1500 sk->sk_write_space = xs_udp_write_space;
1501 sk->sk_no_check = UDP_CSUM_NORCV;
1502 sk->sk_allocation = GFP_ATOMIC;
1503
1504 xprt_set_connected(xprt);
1505
1506 /* Reset to new socket */
1507 transport->sock = sock;
1508 transport->inet = sk;
1509
1510 write_unlock_bh(&sk->sk_callback_lock);
1511 }
1512 xs_udp_do_set_buffer_size(xprt);
1513 }
1514
1515 /**
1516 * xs_udp_connect_worker4 - set up a UDP socket
1517 * @work: RPC transport to connect
1518 *
1519 * Invoked by a work queue tasklet.
1520 */
1521 static void xs_udp_connect_worker4(struct work_struct *work)
1522 {
1523 struct sock_xprt *transport =
1524 container_of(work, struct sock_xprt, connect_worker.work);
1525 struct rpc_xprt *xprt = &transport->xprt;
1526 struct socket *sock = transport->sock;
1527 int err, status = -EIO;
1528
1529 if (xprt->shutdown || !xprt_bound(xprt))
1530 goto out;
1531
1532 /* Start by resetting any existing state */
1533 xs_close(xprt);
1534
1535 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1536 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1537 goto out;
1538 }
1539 xs_reclassify_socket4(sock);
1540
1541 if (xs_bind4(transport, sock)) {
1542 sock_release(sock);
1543 goto out;
1544 }
1545
1546 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1547 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1548
1549 xs_udp_finish_connecting(xprt, sock);
1550 status = 0;
1551 out:
1552 xprt_wake_pending_tasks(xprt, status);
1553 xprt_clear_connecting(xprt);
1554 }
1555
1556 /**
1557 * xs_udp_connect_worker6 - set up a UDP socket
1558 * @work: RPC transport to connect
1559 *
1560 * Invoked by a work queue tasklet.
1561 */
1562 static void xs_udp_connect_worker6(struct work_struct *work)
1563 {
1564 struct sock_xprt *transport =
1565 container_of(work, struct sock_xprt, connect_worker.work);
1566 struct rpc_xprt *xprt = &transport->xprt;
1567 struct socket *sock = transport->sock;
1568 int err, status = -EIO;
1569
1570 if (xprt->shutdown || !xprt_bound(xprt))
1571 goto out;
1572
1573 /* Start by resetting any existing state */
1574 xs_close(xprt);
1575
1576 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1577 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1578 goto out;
1579 }
1580 xs_reclassify_socket6(sock);
1581
1582 if (xs_bind6(transport, sock) < 0) {
1583 sock_release(sock);
1584 goto out;
1585 }
1586
1587 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1588 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1589
1590 xs_udp_finish_connecting(xprt, sock);
1591 status = 0;
1592 out:
1593 xprt_wake_pending_tasks(xprt, status);
1594 xprt_clear_connecting(xprt);
1595 }
1596
1597 /*
1598 * We need to preserve the port number so the reply cache on the server can
1599 * find our cached RPC replies when we get around to reconnecting.
1600 */
1601 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1602 {
1603 int result;
1604 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1605 struct sockaddr any;
1606
1607 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1608
1609 /*
1610 * Disconnect the transport socket by doing a connect operation
1611 * with AF_UNSPEC. This should return immediately...
1612 */
1613 memset(&any, 0, sizeof(any));
1614 any.sa_family = AF_UNSPEC;
1615 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1616 if (result)
1617 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1618 result);
1619 }
1620
1621 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1622 {
1623 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1624
1625 if (!transport->inet) {
1626 struct sock *sk = sock->sk;
1627
1628 write_lock_bh(&sk->sk_callback_lock);
1629
1630 xs_save_old_callbacks(transport, sk);
1631
1632 sk->sk_user_data = xprt;
1633 sk->sk_data_ready = xs_tcp_data_ready;
1634 sk->sk_state_change = xs_tcp_state_change;
1635 sk->sk_write_space = xs_tcp_write_space;
1636 sk->sk_error_report = xs_tcp_error_report;
1637 sk->sk_allocation = GFP_ATOMIC;
1638
1639 /* socket options */
1640 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1641 sock_reset_flag(sk, SOCK_LINGER);
1642 tcp_sk(sk)->linger2 = 0;
1643 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1644
1645 xprt_clear_connected(xprt);
1646
1647 /* Reset to new socket */
1648 transport->sock = sock;
1649 transport->inet = sk;
1650
1651 write_unlock_bh(&sk->sk_callback_lock);
1652 }
1653
1654 /* Tell the socket layer to start connecting... */
1655 xprt->stat.connect_count++;
1656 xprt->stat.connect_start = jiffies;
1657 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1658 }
1659
1660 /**
1661 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1662 * @work: RPC transport to connect
1663 *
1664 * Invoked by a work queue tasklet.
1665 */
1666 static void xs_tcp_connect_worker4(struct work_struct *work)
1667 {
1668 struct sock_xprt *transport =
1669 container_of(work, struct sock_xprt, connect_worker.work);
1670 struct rpc_xprt *xprt = &transport->xprt;
1671 struct socket *sock = transport->sock;
1672 int err, status = -EIO;
1673
1674 if (xprt->shutdown || !xprt_bound(xprt))
1675 goto out;
1676
1677 if (!sock) {
1678 /* start from scratch */
1679 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1680 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1681 goto out;
1682 }
1683 xs_reclassify_socket4(sock);
1684
1685 if (xs_bind4(transport, sock) < 0) {
1686 sock_release(sock);
1687 goto out;
1688 }
1689 } else
1690 /* "close" the socket, preserving the local port */
1691 xs_tcp_reuse_connection(xprt);
1692
1693 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1694 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1695
1696 status = xs_tcp_finish_connecting(xprt, sock);
1697 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1698 xprt, -status, xprt_connected(xprt),
1699 sock->sk->sk_state);
1700 if (status < 0) {
1701 switch (status) {
1702 case -EINPROGRESS:
1703 case -EALREADY:
1704 goto out_clear;
1705 case -ECONNREFUSED:
1706 case -ECONNRESET:
1707 /* retry with existing socket, after a delay */
1708 break;
1709 default:
1710 /* get rid of existing socket, and retry */
1711 xs_tcp_shutdown(xprt);
1712 }
1713 }
1714 out:
1715 xprt_wake_pending_tasks(xprt, status);
1716 out_clear:
1717 xprt_clear_connecting(xprt);
1718 }
1719
1720 /**
1721 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1722 * @work: RPC transport to connect
1723 *
1724 * Invoked by a work queue tasklet.
1725 */
1726 static void xs_tcp_connect_worker6(struct work_struct *work)
1727 {
1728 struct sock_xprt *transport =
1729 container_of(work, struct sock_xprt, connect_worker.work);
1730 struct rpc_xprt *xprt = &transport->xprt;
1731 struct socket *sock = transport->sock;
1732 int err, status = -EIO;
1733
1734 if (xprt->shutdown || !xprt_bound(xprt))
1735 goto out;
1736
1737 if (!sock) {
1738 /* start from scratch */
1739 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1740 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1741 goto out;
1742 }
1743 xs_reclassify_socket6(sock);
1744
1745 if (xs_bind6(transport, sock) < 0) {
1746 sock_release(sock);
1747 goto out;
1748 }
1749 } else
1750 /* "close" the socket, preserving the local port */
1751 xs_tcp_reuse_connection(xprt);
1752
1753 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1754 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1755
1756 status = xs_tcp_finish_connecting(xprt, sock);
1757 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1758 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1759 if (status < 0) {
1760 switch (status) {
1761 case -EINPROGRESS:
1762 case -EALREADY:
1763 goto out_clear;
1764 case -ECONNREFUSED:
1765 case -ECONNRESET:
1766 /* retry with existing socket, after a delay */
1767 break;
1768 default:
1769 /* get rid of existing socket, and retry */
1770 xs_tcp_shutdown(xprt);
1771 }
1772 }
1773 out:
1774 xprt_wake_pending_tasks(xprt, status);
1775 out_clear:
1776 xprt_clear_connecting(xprt);
1777 }
1778
1779 /**
1780 * xs_connect - connect a socket to a remote endpoint
1781 * @task: address of RPC task that manages state of connect request
1782 *
1783 * TCP: If the remote end dropped the connection, delay reconnecting.
1784 *
1785 * UDP socket connects are synchronous, but we use a work queue anyway
1786 * to guarantee that even unprivileged user processes can set up a
1787 * socket on a privileged port.
1788 *
1789 * If a UDP socket connect fails, the delay behavior here prevents
1790 * retry floods (hard mounts).
1791 */
1792 static void xs_connect(struct rpc_task *task)
1793 {
1794 struct rpc_xprt *xprt = task->tk_xprt;
1795 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1796
1797 if (xprt_test_and_set_connecting(xprt))
1798 return;
1799
1800 if (transport->sock != NULL) {
1801 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1802 "seconds\n",
1803 xprt, xprt->reestablish_timeout / HZ);
1804 queue_delayed_work(rpciod_workqueue,
1805 &transport->connect_worker,
1806 xprt->reestablish_timeout);
1807 xprt->reestablish_timeout <<= 1;
1808 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1809 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1810 } else {
1811 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1812 queue_delayed_work(rpciod_workqueue,
1813 &transport->connect_worker, 0);
1814 }
1815 }
1816
1817 static void xs_tcp_connect(struct rpc_task *task)
1818 {
1819 struct rpc_xprt *xprt = task->tk_xprt;
1820
1821 /* Initiate graceful shutdown of the socket if not already done */
1822 if (test_bit(XPRT_CONNECTED, &xprt->state))
1823 xs_tcp_shutdown(xprt);
1824 /* Exit if we need to wait for socket shutdown to complete */
1825 if (test_bit(XPRT_CLOSING, &xprt->state))
1826 return;
1827 xs_connect(task);
1828 }
1829
1830 /**
1831 * xs_udp_print_stats - display UDP socket-specifc stats
1832 * @xprt: rpc_xprt struct containing statistics
1833 * @seq: output file
1834 *
1835 */
1836 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1837 {
1838 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1839
1840 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1841 transport->port,
1842 xprt->stat.bind_count,
1843 xprt->stat.sends,
1844 xprt->stat.recvs,
1845 xprt->stat.bad_xids,
1846 xprt->stat.req_u,
1847 xprt->stat.bklog_u);
1848 }
1849
1850 /**
1851 * xs_tcp_print_stats - display TCP socket-specifc stats
1852 * @xprt: rpc_xprt struct containing statistics
1853 * @seq: output file
1854 *
1855 */
1856 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1857 {
1858 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1859 long idle_time = 0;
1860
1861 if (xprt_connected(xprt))
1862 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1863
1864 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1865 transport->port,
1866 xprt->stat.bind_count,
1867 xprt->stat.connect_count,
1868 xprt->stat.connect_time,
1869 idle_time,
1870 xprt->stat.sends,
1871 xprt->stat.recvs,
1872 xprt->stat.bad_xids,
1873 xprt->stat.req_u,
1874 xprt->stat.bklog_u);
1875 }
1876
1877 static struct rpc_xprt_ops xs_udp_ops = {
1878 .set_buffer_size = xs_udp_set_buffer_size,
1879 .reserve_xprt = xprt_reserve_xprt_cong,
1880 .release_xprt = xprt_release_xprt_cong,
1881 .rpcbind = rpcb_getport_async,
1882 .set_port = xs_set_port,
1883 .connect = xs_connect,
1884 .buf_alloc = rpc_malloc,
1885 .buf_free = rpc_free,
1886 .send_request = xs_udp_send_request,
1887 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1888 .timer = xs_udp_timer,
1889 .release_request = xprt_release_rqst_cong,
1890 .close = xs_close,
1891 .destroy = xs_destroy,
1892 .print_stats = xs_udp_print_stats,
1893 };
1894
1895 static struct rpc_xprt_ops xs_tcp_ops = {
1896 .reserve_xprt = xprt_reserve_xprt,
1897 .release_xprt = xs_tcp_release_xprt,
1898 .rpcbind = rpcb_getport_async,
1899 .set_port = xs_set_port,
1900 .connect = xs_tcp_connect,
1901 .buf_alloc = rpc_malloc,
1902 .buf_free = rpc_free,
1903 .send_request = xs_tcp_send_request,
1904 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1905 .close = xs_tcp_shutdown,
1906 .destroy = xs_destroy,
1907 .print_stats = xs_tcp_print_stats,
1908 };
1909
1910 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1911 unsigned int slot_table_size)
1912 {
1913 struct rpc_xprt *xprt;
1914 struct sock_xprt *new;
1915
1916 if (args->addrlen > sizeof(xprt->addr)) {
1917 dprintk("RPC: xs_setup_xprt: address too large\n");
1918 return ERR_PTR(-EBADF);
1919 }
1920
1921 new = kzalloc(sizeof(*new), GFP_KERNEL);
1922 if (new == NULL) {
1923 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1924 "rpc_xprt\n");
1925 return ERR_PTR(-ENOMEM);
1926 }
1927 xprt = &new->xprt;
1928
1929 xprt->max_reqs = slot_table_size;
1930 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1931 if (xprt->slot == NULL) {
1932 kfree(xprt);
1933 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1934 "table\n");
1935 return ERR_PTR(-ENOMEM);
1936 }
1937
1938 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1939 xprt->addrlen = args->addrlen;
1940 if (args->srcaddr)
1941 memcpy(&new->addr, args->srcaddr, args->addrlen);
1942
1943 return xprt;
1944 }
1945
1946 static const struct rpc_timeout xs_udp_default_timeout = {
1947 .to_initval = 5 * HZ,
1948 .to_maxval = 30 * HZ,
1949 .to_increment = 5 * HZ,
1950 .to_retries = 5,
1951 };
1952
1953 /**
1954 * xs_setup_udp - Set up transport to use a UDP socket
1955 * @args: rpc transport creation arguments
1956 *
1957 */
1958 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1959 {
1960 struct sockaddr *addr = args->dstaddr;
1961 struct rpc_xprt *xprt;
1962 struct sock_xprt *transport;
1963
1964 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1965 if (IS_ERR(xprt))
1966 return xprt;
1967 transport = container_of(xprt, struct sock_xprt, xprt);
1968
1969 xprt->prot = IPPROTO_UDP;
1970 xprt->tsh_size = 0;
1971 /* XXX: header size can vary due to auth type, IPv6, etc. */
1972 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1973
1974 xprt->bind_timeout = XS_BIND_TO;
1975 xprt->connect_timeout = XS_UDP_CONN_TO;
1976 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1977 xprt->idle_timeout = XS_IDLE_DISC_TO;
1978
1979 xprt->ops = &xs_udp_ops;
1980
1981 xprt->timeout = &xs_udp_default_timeout;
1982
1983 switch (addr->sa_family) {
1984 case AF_INET:
1985 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1986 xprt_set_bound(xprt);
1987
1988 INIT_DELAYED_WORK(&transport->connect_worker,
1989 xs_udp_connect_worker4);
1990 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1991 break;
1992 case AF_INET6:
1993 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1994 xprt_set_bound(xprt);
1995
1996 INIT_DELAYED_WORK(&transport->connect_worker,
1997 xs_udp_connect_worker6);
1998 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1999 break;
2000 default:
2001 kfree(xprt);
2002 return ERR_PTR(-EAFNOSUPPORT);
2003 }
2004
2005 dprintk("RPC: set up transport to address %s\n",
2006 xprt->address_strings[RPC_DISPLAY_ALL]);
2007
2008 if (try_module_get(THIS_MODULE))
2009 return xprt;
2010
2011 kfree(xprt->slot);
2012 kfree(xprt);
2013 return ERR_PTR(-EINVAL);
2014 }
2015
2016 static const struct rpc_timeout xs_tcp_default_timeout = {
2017 .to_initval = 60 * HZ,
2018 .to_maxval = 60 * HZ,
2019 .to_retries = 2,
2020 };
2021
2022 /**
2023 * xs_setup_tcp - Set up transport to use a TCP socket
2024 * @args: rpc transport creation arguments
2025 *
2026 */
2027 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2028 {
2029 struct sockaddr *addr = args->dstaddr;
2030 struct rpc_xprt *xprt;
2031 struct sock_xprt *transport;
2032
2033 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2034 if (IS_ERR(xprt))
2035 return xprt;
2036 transport = container_of(xprt, struct sock_xprt, xprt);
2037
2038 xprt->prot = IPPROTO_TCP;
2039 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2040 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2041
2042 xprt->bind_timeout = XS_BIND_TO;
2043 xprt->connect_timeout = XS_TCP_CONN_TO;
2044 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2045 xprt->idle_timeout = XS_IDLE_DISC_TO;
2046
2047 xprt->ops = &xs_tcp_ops;
2048 xprt->timeout = &xs_tcp_default_timeout;
2049
2050 switch (addr->sa_family) {
2051 case AF_INET:
2052 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2053 xprt_set_bound(xprt);
2054
2055 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2056 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2057 break;
2058 case AF_INET6:
2059 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2060 xprt_set_bound(xprt);
2061
2062 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2063 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2064 break;
2065 default:
2066 kfree(xprt);
2067 return ERR_PTR(-EAFNOSUPPORT);
2068 }
2069
2070 dprintk("RPC: set up transport to address %s\n",
2071 xprt->address_strings[RPC_DISPLAY_ALL]);
2072
2073 if (try_module_get(THIS_MODULE))
2074 return xprt;
2075
2076 kfree(xprt->slot);
2077 kfree(xprt);
2078 return ERR_PTR(-EINVAL);
2079 }
2080
2081 static struct xprt_class xs_udp_transport = {
2082 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2083 .name = "udp",
2084 .owner = THIS_MODULE,
2085 .ident = IPPROTO_UDP,
2086 .setup = xs_setup_udp,
2087 };
2088
2089 static struct xprt_class xs_tcp_transport = {
2090 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2091 .name = "tcp",
2092 .owner = THIS_MODULE,
2093 .ident = IPPROTO_TCP,
2094 .setup = xs_setup_tcp,
2095 };
2096
2097 /**
2098 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2099 *
2100 */
2101 int init_socket_xprt(void)
2102 {
2103 #ifdef RPC_DEBUG
2104 if (!sunrpc_table_header)
2105 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2106 #endif
2107
2108 xprt_register_transport(&xs_udp_transport);
2109 xprt_register_transport(&xs_tcp_transport);
2110
2111 return 0;
2112 }
2113
2114 /**
2115 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2116 *
2117 */
2118 void cleanup_socket_xprt(void)
2119 {
2120 #ifdef RPC_DEBUG
2121 if (sunrpc_table_header) {
2122 unregister_sysctl_table(sunrpc_table_header);
2123 sunrpc_table_header = NULL;
2124 }
2125 #endif
2126
2127 xprt_unregister_transport(&xs_udp_transport);
2128 xprt_unregister_transport(&xs_tcp_transport);
2129 }
Linux kernel - Deliverables
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