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SUNRPC: Fix a missing "break" option in xs_tcp_setup_socket()
[linux-2.6/verdex.git] / net / sunrpc / xprtsock.c
blobf7f3dfd211ea7ac64f2901c9dc8df14b3859f41a
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 #define XS_TCP_LINGER_TO (15U * HZ)
53 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
54
55 /*
56 * We can register our own files under /proc/sys/sunrpc by
57 * calling register_sysctl_table() again. The files in that
58 * directory become the union of all files registered there.
59 *
60 * We simply need to make sure that we don't collide with
61 * someone else's file names!
62 */
63
64 #ifdef RPC_DEBUG
65
66 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
67 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
68 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
69 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
70
71 static struct ctl_table_header *sunrpc_table_header;
72
73 /*
74 * FIXME: changing the UDP slot table size should also resize the UDP
75 * socket buffers for existing UDP transports
76 */
77 static ctl_table xs_tunables_table[] = {
78 {
79 .ctl_name = CTL_SLOTTABLE_UDP,
80 .procname = "udp_slot_table_entries",
81 .data = &xprt_udp_slot_table_entries,
82 .maxlen = sizeof(unsigned int),
83 .mode = 0644,
84 .proc_handler = &proc_dointvec_minmax,
85 .strategy = &sysctl_intvec,
86 .extra1 = &min_slot_table_size,
87 .extra2 = &max_slot_table_size
88 },
89 {
90 .ctl_name = CTL_SLOTTABLE_TCP,
91 .procname = "tcp_slot_table_entries",
92 .data = &xprt_tcp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
95 .proc_handler = &proc_dointvec_minmax,
96 .strategy = &sysctl_intvec,
97 .extra1 = &min_slot_table_size,
98 .extra2 = &max_slot_table_size
99 },
100 {
101 .ctl_name = CTL_MIN_RESVPORT,
102 .procname = "min_resvport",
103 .data = &xprt_min_resvport,
104 .maxlen = sizeof(unsigned int),
105 .mode = 0644,
106 .proc_handler = &proc_dointvec_minmax,
107 .strategy = &sysctl_intvec,
108 .extra1 = &xprt_min_resvport_limit,
109 .extra2 = &xprt_max_resvport_limit
110 },
111 {
112 .ctl_name = CTL_MAX_RESVPORT,
113 .procname = "max_resvport",
114 .data = &xprt_max_resvport,
115 .maxlen = sizeof(unsigned int),
116 .mode = 0644,
117 .proc_handler = &proc_dointvec_minmax,
118 .strategy = &sysctl_intvec,
119 .extra1 = &xprt_min_resvport_limit,
120 .extra2 = &xprt_max_resvport_limit
121 },
122 {
123 .procname = "tcp_fin_timeout",
124 .data = &xs_tcp_fin_timeout,
125 .maxlen = sizeof(xs_tcp_fin_timeout),
126 .mode = 0644,
127 .proc_handler = &proc_dointvec_jiffies,
128 .strategy = sysctl_jiffies
129 },
130 {
131 .ctl_name = 0,
132 },
133 };
134
135 static ctl_table sunrpc_table[] = {
136 {
137 .ctl_name = CTL_SUNRPC,
138 .procname = "sunrpc",
139 .mode = 0555,
140 .child = xs_tunables_table
141 },
142 {
143 .ctl_name = 0,
144 },
145 };
146
147 #endif
148
149 /*
150 * Time out for an RPC UDP socket connect. UDP socket connects are
151 * synchronous, but we set a timeout anyway in case of resource
152 * exhaustion on the local host.
153 */
154 #define XS_UDP_CONN_TO (5U * HZ)
155
156 /*
157 * Wait duration for an RPC TCP connection to be established. Solaris
158 * NFS over TCP uses 60 seconds, for example, which is in line with how
159 * long a server takes to reboot.
160 */
161 #define XS_TCP_CONN_TO (60U * HZ)
162
163 /*
164 * Wait duration for a reply from the RPC portmapper.
165 */
166 #define XS_BIND_TO (60U * HZ)
167
168 /*
169 * Delay if a UDP socket connect error occurs. This is most likely some
170 * kind of resource problem on the local host.
171 */
172 #define XS_UDP_REEST_TO (2U * HZ)
173
174 /*
175 * The reestablish timeout allows clients to delay for a bit before attempting
176 * to reconnect to a server that just dropped our connection.
177 *
178 * We implement an exponential backoff when trying to reestablish a TCP
179 * transport connection with the server. Some servers like to drop a TCP
180 * connection when they are overworked, so we start with a short timeout and
181 * increase over time if the server is down or not responding.
182 */
183 #define XS_TCP_INIT_REEST_TO (3U * HZ)
184 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
185
186 /*
187 * TCP idle timeout; client drops the transport socket if it is idle
188 * for this long. Note that we also timeout UDP sockets to prevent
189 * holding port numbers when there is no RPC traffic.
190 */
191 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
192
193 #ifdef RPC_DEBUG
194 # undef RPC_DEBUG_DATA
195 # define RPCDBG_FACILITY RPCDBG_TRANS
196 #endif
197
198 #ifdef RPC_DEBUG_DATA
199 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
200 {
201 u8 *buf = (u8 *) packet;
202 int j;
203
204 dprintk("RPC: %s\n", msg);
205 for (j = 0; j < count && j < 128; j += 4) {
206 if (!(j & 31)) {
207 if (j)
208 dprintk("\n");
209 dprintk("0x%04x ", j);
210 }
211 dprintk("%02x%02x%02x%02x ",
212 buf[j], buf[j+1], buf[j+2], buf[j+3]);
213 }
214 dprintk("\n");
215 }
216 #else
217 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
218 {
219 /* NOP */
220 }
221 #endif
222
223 struct sock_xprt {
224 struct rpc_xprt xprt;
225
226 /*
227 * Network layer
228 */
229 struct socket * sock;
230 struct sock * inet;
231
232 /*
233 * State of TCP reply receive
234 */
235 __be32 tcp_fraghdr,
236 tcp_xid;
237
238 u32 tcp_offset,
239 tcp_reclen;
240
241 unsigned long tcp_copied,
242 tcp_flags;
243
244 /*
245 * Connection of transports
246 */
247 struct delayed_work connect_worker;
248 struct sockaddr_storage addr;
249 unsigned short port;
250
251 /*
252 * UDP socket buffer size parameters
253 */
254 size_t rcvsize,
255 sndsize;
256
257 /*
258 * Saved socket callback addresses
259 */
260 void (*old_data_ready)(struct sock *, int);
261 void (*old_state_change)(struct sock *);
262 void (*old_write_space)(struct sock *);
263 void (*old_error_report)(struct sock *);
264 };
265
266 /*
267 * TCP receive state flags
268 */
269 #define TCP_RCV_LAST_FRAG (1UL << 0)
270 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
271 #define TCP_RCV_COPY_XID (1UL << 2)
272 #define TCP_RCV_COPY_DATA (1UL << 3)
273
274 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
275 {
276 return (struct sockaddr *) &xprt->addr;
277 }
278
279 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
280 {
281 return (struct sockaddr_in *) &xprt->addr;
282 }
283
284 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
285 {
286 return (struct sockaddr_in6 *) &xprt->addr;
287 }
288
289 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
290 const char *protocol,
291 const char *netid)
292 {
293 struct sockaddr_in *addr = xs_addr_in(xprt);
294 char *buf;
295
296 buf = kzalloc(20, GFP_KERNEL);
297 if (buf) {
298 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
299 }
300 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
301
302 buf = kzalloc(8, GFP_KERNEL);
303 if (buf) {
304 snprintf(buf, 8, "%u",
305 ntohs(addr->sin_port));
306 }
307 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
308
309 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
310
311 buf = kzalloc(48, GFP_KERNEL);
312 if (buf) {
313 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s",
314 &addr->sin_addr.s_addr,
315 ntohs(addr->sin_port),
316 protocol);
317 }
318 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
319
320 buf = kzalloc(10, GFP_KERNEL);
321 if (buf) {
322 snprintf(buf, 10, "%02x%02x%02x%02x",
323 NIPQUAD(addr->sin_addr.s_addr));
324 }
325 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
326
327 buf = kzalloc(8, GFP_KERNEL);
328 if (buf) {
329 snprintf(buf, 8, "%4hx",
330 ntohs(addr->sin_port));
331 }
332 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
333
334 buf = kzalloc(30, GFP_KERNEL);
335 if (buf) {
336 snprintf(buf, 30, "%pI4.%u.%u",
337 &addr->sin_addr.s_addr,
338 ntohs(addr->sin_port) >> 8,
339 ntohs(addr->sin_port) & 0xff);
340 }
341 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
342
343 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
344 }
345
346 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
347 const char *protocol,
348 const char *netid)
349 {
350 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
351 char *buf;
352
353 buf = kzalloc(40, GFP_KERNEL);
354 if (buf) {
355 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
356 }
357 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
358
359 buf = kzalloc(8, GFP_KERNEL);
360 if (buf) {
361 snprintf(buf, 8, "%u",
362 ntohs(addr->sin6_port));
363 }
364 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
365
366 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
367
368 buf = kzalloc(64, GFP_KERNEL);
369 if (buf) {
370 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
371 &addr->sin6_addr,
372 ntohs(addr->sin6_port),
373 protocol);
374 }
375 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
376
377 buf = kzalloc(36, GFP_KERNEL);
378 if (buf)
379 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
380
381 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
382
383 buf = kzalloc(8, GFP_KERNEL);
384 if (buf) {
385 snprintf(buf, 8, "%4hx",
386 ntohs(addr->sin6_port));
387 }
388 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
389
390 buf = kzalloc(50, GFP_KERNEL);
391 if (buf) {
392 snprintf(buf, 50, "%pI6.%u.%u",
393 &addr->sin6_addr,
394 ntohs(addr->sin6_port) >> 8,
395 ntohs(addr->sin6_port) & 0xff);
396 }
397 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
398
399 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
400 }
401
402 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
403 {
404 unsigned int i;
405
406 for (i = 0; i < RPC_DISPLAY_MAX; i++)
407 switch (i) {
408 case RPC_DISPLAY_PROTO:
409 case RPC_DISPLAY_NETID:
410 continue;
411 default:
412 kfree(xprt->address_strings[i]);
413 }
414 }
415
416 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
417
418 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
419 {
420 struct msghdr msg = {
421 .msg_name = addr,
422 .msg_namelen = addrlen,
423 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
424 };
425 struct kvec iov = {
426 .iov_base = vec->iov_base + base,
427 .iov_len = vec->iov_len - base,
428 };
429
430 if (iov.iov_len != 0)
431 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
432 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
433 }
434
435 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
436 {
437 struct page **ppage;
438 unsigned int remainder;
439 int err, sent = 0;
440
441 remainder = xdr->page_len - base;
442 base += xdr->page_base;
443 ppage = xdr->pages + (base >> PAGE_SHIFT);
444 base &= ~PAGE_MASK;
445 for(;;) {
446 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
447 int flags = XS_SENDMSG_FLAGS;
448
449 remainder -= len;
450 if (remainder != 0 || more)
451 flags |= MSG_MORE;
452 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
453 if (remainder == 0 || err != len)
454 break;
455 sent += err;
456 ppage++;
457 base = 0;
458 }
459 if (sent == 0)
460 return err;
461 if (err > 0)
462 sent += err;
463 return sent;
464 }
465
466 /**
467 * xs_sendpages - write pages directly to a socket
468 * @sock: socket to send on
469 * @addr: UDP only -- address of destination
470 * @addrlen: UDP only -- length of destination address
471 * @xdr: buffer containing this request
472 * @base: starting position in the buffer
473 *
474 */
475 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
476 {
477 unsigned int remainder = xdr->len - base;
478 int err, sent = 0;
479
480 if (unlikely(!sock))
481 return -ENOTSOCK;
482
483 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
484 if (base != 0) {
485 addr = NULL;
486 addrlen = 0;
487 }
488
489 if (base < xdr->head[0].iov_len || addr != NULL) {
490 unsigned int len = xdr->head[0].iov_len - base;
491 remainder -= len;
492 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
493 if (remainder == 0 || err != len)
494 goto out;
495 sent += err;
496 base = 0;
497 } else
498 base -= xdr->head[0].iov_len;
499
500 if (base < xdr->page_len) {
501 unsigned int len = xdr->page_len - base;
502 remainder -= len;
503 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
504 if (remainder == 0 || err != len)
505 goto out;
506 sent += err;
507 base = 0;
508 } else
509 base -= xdr->page_len;
510
511 if (base >= xdr->tail[0].iov_len)
512 return sent;
513 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
514 out:
515 if (sent == 0)
516 return err;
517 if (err > 0)
518 sent += err;
519 return sent;
520 }
521
522 static void xs_nospace_callback(struct rpc_task *task)
523 {
524 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
525
526 transport->inet->sk_write_pending--;
527 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
528 }
529
530 /**
531 * xs_nospace - place task on wait queue if transmit was incomplete
532 * @task: task to put to sleep
533 *
534 */
535 static int xs_nospace(struct rpc_task *task)
536 {
537 struct rpc_rqst *req = task->tk_rqstp;
538 struct rpc_xprt *xprt = req->rq_xprt;
539 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
540 int ret = 0;
541
542 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
543 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
544 req->rq_slen);
545
546 /* Protect against races with write_space */
547 spin_lock_bh(&xprt->transport_lock);
548
549 /* Don't race with disconnect */
550 if (xprt_connected(xprt)) {
551 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
552 ret = -EAGAIN;
553 /*
554 * Notify TCP that we're limited by the application
555 * window size
556 */
557 set_bit(SOCK_NOSPACE, &transport->sock->flags);
558 transport->inet->sk_write_pending++;
559 /* ...and wait for more buffer space */
560 xprt_wait_for_buffer_space(task, xs_nospace_callback);
561 }
562 } else {
563 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
564 ret = -ENOTCONN;
565 }
566
567 spin_unlock_bh(&xprt->transport_lock);
568 return ret;
569 }
570
571 /**
572 * xs_udp_send_request - write an RPC request to a UDP socket
573 * @task: address of RPC task that manages the state of an RPC request
574 *
575 * Return values:
576 * 0: The request has been sent
577 * EAGAIN: The socket was blocked, please call again later to
578 * complete the request
579 * ENOTCONN: Caller needs to invoke connect logic then call again
580 * other: Some other error occured, the request was not sent
581 */
582 static int xs_udp_send_request(struct rpc_task *task)
583 {
584 struct rpc_rqst *req = task->tk_rqstp;
585 struct rpc_xprt *xprt = req->rq_xprt;
586 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
587 struct xdr_buf *xdr = &req->rq_snd_buf;
588 int status;
589
590 xs_pktdump("packet data:",
591 req->rq_svec->iov_base,
592 req->rq_svec->iov_len);
593
594 if (!xprt_bound(xprt))
595 return -ENOTCONN;
596 status = xs_sendpages(transport->sock,
597 xs_addr(xprt),
598 xprt->addrlen, xdr,
599 req->rq_bytes_sent);
600
601 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
602 xdr->len - req->rq_bytes_sent, status);
603
604 if (status >= 0) {
605 task->tk_bytes_sent += status;
606 if (status >= req->rq_slen)
607 return 0;
608 /* Still some bytes left; set up for a retry later. */
609 status = -EAGAIN;
610 }
611 if (!transport->sock)
612 goto out;
613
614 switch (status) {
615 case -ENOTSOCK:
616 status = -ENOTCONN;
617 /* Should we call xs_close() here? */
618 break;
619 case -EAGAIN:
620 status = xs_nospace(task);
621 break;
622 default:
623 dprintk("RPC: sendmsg returned unrecognized error %d\n",
624 -status);
625 case -ENETUNREACH:
626 case -EPIPE:
627 case -ECONNREFUSED:
628 /* When the server has died, an ICMP port unreachable message
629 * prompts ECONNREFUSED. */
630 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
631 }
632 out:
633 return status;
634 }
635
636 /**
637 * xs_tcp_shutdown - gracefully shut down a TCP socket
638 * @xprt: transport
639 *
640 * Initiates a graceful shutdown of the TCP socket by calling the
641 * equivalent of shutdown(SHUT_WR);
642 */
643 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
644 {
645 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
646 struct socket *sock = transport->sock;
647
648 if (sock != NULL)
649 kernel_sock_shutdown(sock, SHUT_WR);
650 }
651
652 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
653 {
654 u32 reclen = buf->len - sizeof(rpc_fraghdr);
655 rpc_fraghdr *base = buf->head[0].iov_base;
656 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
657 }
658
659 /**
660 * xs_tcp_send_request - write an RPC request to a TCP socket
661 * @task: address of RPC task that manages the state of an RPC request
662 *
663 * Return values:
664 * 0: The request has been sent
665 * EAGAIN: The socket was blocked, please call again later to
666 * complete the request
667 * ENOTCONN: Caller needs to invoke connect logic then call again
668 * other: Some other error occured, the request was not sent
669 *
670 * XXX: In the case of soft timeouts, should we eventually give up
671 * if sendmsg is not able to make progress?
672 */
673 static int xs_tcp_send_request(struct rpc_task *task)
674 {
675 struct rpc_rqst *req = task->tk_rqstp;
676 struct rpc_xprt *xprt = req->rq_xprt;
677 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
678 struct xdr_buf *xdr = &req->rq_snd_buf;
679 int status;
680
681 xs_encode_tcp_record_marker(&req->rq_snd_buf);
682
683 xs_pktdump("packet data:",
684 req->rq_svec->iov_base,
685 req->rq_svec->iov_len);
686
687 /* Continue transmitting the packet/record. We must be careful
688 * to cope with writespace callbacks arriving _after_ we have
689 * called sendmsg(). */
690 while (1) {
691 status = xs_sendpages(transport->sock,
692 NULL, 0, xdr, req->rq_bytes_sent);
693
694 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
695 xdr->len - req->rq_bytes_sent, status);
696
697 if (unlikely(status < 0))
698 break;
699
700 /* If we've sent the entire packet, immediately
701 * reset the count of bytes sent. */
702 req->rq_bytes_sent += status;
703 task->tk_bytes_sent += status;
704 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
705 req->rq_bytes_sent = 0;
706 return 0;
707 }
708
709 if (status != 0)
710 continue;
711 status = -EAGAIN;
712 break;
713 }
714 if (!transport->sock)
715 goto out;
716
717 switch (status) {
718 case -ENOTSOCK:
719 status = -ENOTCONN;
720 /* Should we call xs_close() here? */
721 break;
722 case -EAGAIN:
723 status = xs_nospace(task);
724 break;
725 default:
726 dprintk("RPC: sendmsg returned unrecognized error %d\n",
727 -status);
728 case -ECONNRESET:
729 case -EPIPE:
730 xs_tcp_shutdown(xprt);
731 case -ECONNREFUSED:
732 case -ENOTCONN:
733 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
734 }
735 out:
736 return status;
737 }
738
739 /**
740 * xs_tcp_release_xprt - clean up after a tcp transmission
741 * @xprt: transport
742 * @task: rpc task
743 *
744 * This cleans up if an error causes us to abort the transmission of a request.
745 * In this case, the socket may need to be reset in order to avoid confusing
746 * the server.
747 */
748 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
749 {
750 struct rpc_rqst *req;
751
752 if (task != xprt->snd_task)
753 return;
754 if (task == NULL)
755 goto out_release;
756 req = task->tk_rqstp;
757 if (req->rq_bytes_sent == 0)
758 goto out_release;
759 if (req->rq_bytes_sent == req->rq_snd_buf.len)
760 goto out_release;
761 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
762 out_release:
763 xprt_release_xprt(xprt, task);
764 }
765
766 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
767 {
768 transport->old_data_ready = sk->sk_data_ready;
769 transport->old_state_change = sk->sk_state_change;
770 transport->old_write_space = sk->sk_write_space;
771 transport->old_error_report = sk->sk_error_report;
772 }
773
774 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
775 {
776 sk->sk_data_ready = transport->old_data_ready;
777 sk->sk_state_change = transport->old_state_change;
778 sk->sk_write_space = transport->old_write_space;
779 sk->sk_error_report = transport->old_error_report;
780 }
781
782 static void xs_reset_transport(struct sock_xprt *transport)
783 {
784 struct socket *sock = transport->sock;
785 struct sock *sk = transport->inet;
786
787 if (sk == NULL)
788 return;
789
790 write_lock_bh(&sk->sk_callback_lock);
791 transport->inet = NULL;
792 transport->sock = NULL;
793
794 sk->sk_user_data = NULL;
795
796 xs_restore_old_callbacks(transport, sk);
797 write_unlock_bh(&sk->sk_callback_lock);
798
799 sk->sk_no_check = 0;
800
801 sock_release(sock);
802 }
803
804 /**
805 * xs_close - close a socket
806 * @xprt: transport
807 *
808 * This is used when all requests are complete; ie, no DRC state remains
809 * on the server we want to save.
810 *
811 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
812 * xs_reset_transport() zeroing the socket from underneath a writer.
813 */
814 static void xs_close(struct rpc_xprt *xprt)
815 {
816 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
817
818 dprintk("RPC: xs_close xprt %p\n", xprt);
819
820 xs_reset_transport(transport);
821
822 smp_mb__before_clear_bit();
823 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
824 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
825 clear_bit(XPRT_CLOSING, &xprt->state);
826 smp_mb__after_clear_bit();
827 xprt_disconnect_done(xprt);
828 }
829
830 static void xs_tcp_close(struct rpc_xprt *xprt)
831 {
832 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
833 xs_close(xprt);
834 else
835 xs_tcp_shutdown(xprt);
836 }
837
838 /**
839 * xs_destroy - prepare to shutdown a transport
840 * @xprt: doomed transport
841 *
842 */
843 static void xs_destroy(struct rpc_xprt *xprt)
844 {
845 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
846
847 dprintk("RPC: xs_destroy xprt %p\n", xprt);
848
849 cancel_rearming_delayed_work(&transport->connect_worker);
850
851 xs_close(xprt);
852 xs_free_peer_addresses(xprt);
853 kfree(xprt->slot);
854 kfree(xprt);
855 module_put(THIS_MODULE);
856 }
857
858 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
859 {
860 return (struct rpc_xprt *) sk->sk_user_data;
861 }
862
863 /**
864 * xs_udp_data_ready - "data ready" callback for UDP sockets
865 * @sk: socket with data to read
866 * @len: how much data to read
867 *
868 */
869 static void xs_udp_data_ready(struct sock *sk, int len)
870 {
871 struct rpc_task *task;
872 struct rpc_xprt *xprt;
873 struct rpc_rqst *rovr;
874 struct sk_buff *skb;
875 int err, repsize, copied;
876 u32 _xid;
877 __be32 *xp;
878
879 read_lock(&sk->sk_callback_lock);
880 dprintk("RPC: xs_udp_data_ready...\n");
881 if (!(xprt = xprt_from_sock(sk)))
882 goto out;
883
884 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
885 goto out;
886
887 if (xprt->shutdown)
888 goto dropit;
889
890 repsize = skb->len - sizeof(struct udphdr);
891 if (repsize < 4) {
892 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
893 goto dropit;
894 }
895
896 /* Copy the XID from the skb... */
897 xp = skb_header_pointer(skb, sizeof(struct udphdr),
898 sizeof(_xid), &_xid);
899 if (xp == NULL)
900 goto dropit;
901
902 /* Look up and lock the request corresponding to the given XID */
903 spin_lock(&xprt->transport_lock);
904 rovr = xprt_lookup_rqst(xprt, *xp);
905 if (!rovr)
906 goto out_unlock;
907 task = rovr->rq_task;
908
909 if ((copied = rovr->rq_private_buf.buflen) > repsize)
910 copied = repsize;
911
912 /* Suck it into the iovec, verify checksum if not done by hw. */
913 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
914 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
915 goto out_unlock;
916 }
917
918 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
919
920 /* Something worked... */
921 dst_confirm(skb_dst(skb));
922
923 xprt_adjust_cwnd(task, copied);
924 xprt_update_rtt(task);
925 xprt_complete_rqst(task, copied);
926
927 out_unlock:
928 spin_unlock(&xprt->transport_lock);
929 dropit:
930 skb_free_datagram(sk, skb);
931 out:
932 read_unlock(&sk->sk_callback_lock);
933 }
934
935 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
936 {
937 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
938 size_t len, used;
939 char *p;
940
941 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
942 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
943 used = xdr_skb_read_bits(desc, p, len);
944 transport->tcp_offset += used;
945 if (used != len)
946 return;
947
948 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
949 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
950 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
951 else
952 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
953 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
954
955 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
956 transport->tcp_offset = 0;
957
958 /* Sanity check of the record length */
959 if (unlikely(transport->tcp_reclen < 4)) {
960 dprintk("RPC: invalid TCP record fragment length\n");
961 xprt_force_disconnect(xprt);
962 return;
963 }
964 dprintk("RPC: reading TCP record fragment of length %d\n",
965 transport->tcp_reclen);
966 }
967
968 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
969 {
970 if (transport->tcp_offset == transport->tcp_reclen) {
971 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
972 transport->tcp_offset = 0;
973 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
974 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
975 transport->tcp_flags |= TCP_RCV_COPY_XID;
976 transport->tcp_copied = 0;
977 }
978 }
979 }
980
981 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
982 {
983 size_t len, used;
984 char *p;
985
986 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
987 dprintk("RPC: reading XID (%Zu bytes)\n", len);
988 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
989 used = xdr_skb_read_bits(desc, p, len);
990 transport->tcp_offset += used;
991 if (used != len)
992 return;
993 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
994 transport->tcp_flags |= TCP_RCV_COPY_DATA;
995 transport->tcp_copied = 4;
996 dprintk("RPC: reading reply for XID %08x\n",
997 ntohl(transport->tcp_xid));
998 xs_tcp_check_fraghdr(transport);
999 }
1000
1001 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1002 {
1003 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1004 struct rpc_rqst *req;
1005 struct xdr_buf *rcvbuf;
1006 size_t len;
1007 ssize_t r;
1008
1009 /* Find and lock the request corresponding to this xid */
1010 spin_lock(&xprt->transport_lock);
1011 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1012 if (!req) {
1013 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1014 dprintk("RPC: XID %08x request not found!\n",
1015 ntohl(transport->tcp_xid));
1016 spin_unlock(&xprt->transport_lock);
1017 return;
1018 }
1019
1020 rcvbuf = &req->rq_private_buf;
1021 len = desc->count;
1022 if (len > transport->tcp_reclen - transport->tcp_offset) {
1023 struct xdr_skb_reader my_desc;
1024
1025 len = transport->tcp_reclen - transport->tcp_offset;
1026 memcpy(&my_desc, desc, sizeof(my_desc));
1027 my_desc.count = len;
1028 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1029 &my_desc, xdr_skb_read_bits);
1030 desc->count -= r;
1031 desc->offset += r;
1032 } else
1033 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1034 desc, xdr_skb_read_bits);
1035
1036 if (r > 0) {
1037 transport->tcp_copied += r;
1038 transport->tcp_offset += r;
1039 }
1040 if (r != len) {
1041 /* Error when copying to the receive buffer,
1042 * usually because we weren't able to allocate
1043 * additional buffer pages. All we can do now
1044 * is turn off TCP_RCV_COPY_DATA, so the request
1045 * will not receive any additional updates,
1046 * and time out.
1047 * Any remaining data from this record will
1048 * be discarded.
1049 */
1050 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1051 dprintk("RPC: XID %08x truncated request\n",
1052 ntohl(transport->tcp_xid));
1053 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1054 "tcp_offset = %u, tcp_reclen = %u\n",
1055 xprt, transport->tcp_copied,
1056 transport->tcp_offset, transport->tcp_reclen);
1057 goto out;
1058 }
1059
1060 dprintk("RPC: XID %08x read %Zd bytes\n",
1061 ntohl(transport->tcp_xid), r);
1062 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1063 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1064 transport->tcp_offset, transport->tcp_reclen);
1065
1066 if (transport->tcp_copied == req->rq_private_buf.buflen)
1067 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1068 else if (transport->tcp_offset == transport->tcp_reclen) {
1069 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1070 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1071 }
1072
1073 out:
1074 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1075 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1076 spin_unlock(&xprt->transport_lock);
1077 xs_tcp_check_fraghdr(transport);
1078 }
1079
1080 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1081 {
1082 size_t len;
1083
1084 len = transport->tcp_reclen - transport->tcp_offset;
1085 if (len > desc->count)
1086 len = desc->count;
1087 desc->count -= len;
1088 desc->offset += len;
1089 transport->tcp_offset += len;
1090 dprintk("RPC: discarded %Zu bytes\n", len);
1091 xs_tcp_check_fraghdr(transport);
1092 }
1093
1094 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1095 {
1096 struct rpc_xprt *xprt = rd_desc->arg.data;
1097 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1098 struct xdr_skb_reader desc = {
1099 .skb = skb,
1100 .offset = offset,
1101 .count = len,
1102 };
1103
1104 dprintk("RPC: xs_tcp_data_recv started\n");
1105 do {
1106 /* Read in a new fragment marker if necessary */
1107 /* Can we ever really expect to get completely empty fragments? */
1108 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1109 xs_tcp_read_fraghdr(xprt, &desc);
1110 continue;
1111 }
1112 /* Read in the xid if necessary */
1113 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1114 xs_tcp_read_xid(transport, &desc);
1115 continue;
1116 }
1117 /* Read in the request data */
1118 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1119 xs_tcp_read_request(xprt, &desc);
1120 continue;
1121 }
1122 /* Skip over any trailing bytes on short reads */
1123 xs_tcp_read_discard(transport, &desc);
1124 } while (desc.count);
1125 dprintk("RPC: xs_tcp_data_recv done\n");
1126 return len - desc.count;
1127 }
1128
1129 /**
1130 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1131 * @sk: socket with data to read
1132 * @bytes: how much data to read
1133 *
1134 */
1135 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1136 {
1137 struct rpc_xprt *xprt;
1138 read_descriptor_t rd_desc;
1139 int read;
1140
1141 dprintk("RPC: xs_tcp_data_ready...\n");
1142
1143 read_lock(&sk->sk_callback_lock);
1144 if (!(xprt = xprt_from_sock(sk)))
1145 goto out;
1146 if (xprt->shutdown)
1147 goto out;
1148
1149 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1150 rd_desc.arg.data = xprt;
1151 do {
1152 rd_desc.count = 65536;
1153 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1154 } while (read > 0);
1155 out:
1156 read_unlock(&sk->sk_callback_lock);
1157 }
1158
1159 /*
1160 * Do the equivalent of linger/linger2 handling for dealing with
1161 * broken servers that don't close the socket in a timely
1162 * fashion
1163 */
1164 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1165 unsigned long timeout)
1166 {
1167 struct sock_xprt *transport;
1168
1169 if (xprt_test_and_set_connecting(xprt))
1170 return;
1171 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1172 transport = container_of(xprt, struct sock_xprt, xprt);
1173 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1174 timeout);
1175 }
1176
1177 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1178 {
1179 struct sock_xprt *transport;
1180
1181 transport = container_of(xprt, struct sock_xprt, xprt);
1182
1183 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1184 !cancel_delayed_work(&transport->connect_worker))
1185 return;
1186 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1187 xprt_clear_connecting(xprt);
1188 }
1189
1190 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1191 {
1192 smp_mb__before_clear_bit();
1193 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1194 clear_bit(XPRT_CLOSING, &xprt->state);
1195 smp_mb__after_clear_bit();
1196 /* Mark transport as closed and wake up all pending tasks */
1197 xprt_disconnect_done(xprt);
1198 }
1199
1200 /**
1201 * xs_tcp_state_change - callback to handle TCP socket state changes
1202 * @sk: socket whose state has changed
1203 *
1204 */
1205 static void xs_tcp_state_change(struct sock *sk)
1206 {
1207 struct rpc_xprt *xprt;
1208
1209 read_lock(&sk->sk_callback_lock);
1210 if (!(xprt = xprt_from_sock(sk)))
1211 goto out;
1212 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1213 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1214 sk->sk_state, xprt_connected(xprt),
1215 sock_flag(sk, SOCK_DEAD),
1216 sock_flag(sk, SOCK_ZAPPED));
1217
1218 switch (sk->sk_state) {
1219 case TCP_ESTABLISHED:
1220 spin_lock_bh(&xprt->transport_lock);
1221 if (!xprt_test_and_set_connected(xprt)) {
1222 struct sock_xprt *transport = container_of(xprt,
1223 struct sock_xprt, xprt);
1224
1225 /* Reset TCP record info */
1226 transport->tcp_offset = 0;
1227 transport->tcp_reclen = 0;
1228 transport->tcp_copied = 0;
1229 transport->tcp_flags =
1230 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1231
1232 xprt_wake_pending_tasks(xprt, -EAGAIN);
1233 }
1234 spin_unlock_bh(&xprt->transport_lock);
1235 break;
1236 case TCP_FIN_WAIT1:
1237 /* The client initiated a shutdown of the socket */
1238 xprt->connect_cookie++;
1239 xprt->reestablish_timeout = 0;
1240 set_bit(XPRT_CLOSING, &xprt->state);
1241 smp_mb__before_clear_bit();
1242 clear_bit(XPRT_CONNECTED, &xprt->state);
1243 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1244 smp_mb__after_clear_bit();
1245 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1246 break;
1247 case TCP_CLOSE_WAIT:
1248 /* The server initiated a shutdown of the socket */
1249 xprt_force_disconnect(xprt);
1250 case TCP_SYN_SENT:
1251 xprt->connect_cookie++;
1252 case TCP_CLOSING:
1253 /*
1254 * If the server closed down the connection, make sure that
1255 * we back off before reconnecting
1256 */
1257 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1258 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1259 break;
1260 case TCP_LAST_ACK:
1261 set_bit(XPRT_CLOSING, &xprt->state);
1262 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1263 smp_mb__before_clear_bit();
1264 clear_bit(XPRT_CONNECTED, &xprt->state);
1265 smp_mb__after_clear_bit();
1266 break;
1267 case TCP_CLOSE:
1268 xs_tcp_cancel_linger_timeout(xprt);
1269 xs_sock_mark_closed(xprt);
1270 }
1271 out:
1272 read_unlock(&sk->sk_callback_lock);
1273 }
1274
1275 /**
1276 * xs_error_report - callback mainly for catching socket errors
1277 * @sk: socket
1278 */
1279 static void xs_error_report(struct sock *sk)
1280 {
1281 struct rpc_xprt *xprt;
1282
1283 read_lock(&sk->sk_callback_lock);
1284 if (!(xprt = xprt_from_sock(sk)))
1285 goto out;
1286 dprintk("RPC: %s client %p...\n"
1287 "RPC: error %d\n",
1288 __func__, xprt, sk->sk_err);
1289 xprt_wake_pending_tasks(xprt, -EAGAIN);
1290 out:
1291 read_unlock(&sk->sk_callback_lock);
1292 }
1293
1294 static void xs_write_space(struct sock *sk)
1295 {
1296 struct socket *sock;
1297 struct rpc_xprt *xprt;
1298
1299 if (unlikely(!(sock = sk->sk_socket)))
1300 return;
1301 clear_bit(SOCK_NOSPACE, &sock->flags);
1302
1303 if (unlikely(!(xprt = xprt_from_sock(sk))))
1304 return;
1305 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1306 return;
1307
1308 xprt_write_space(xprt);
1309 }
1310
1311 /**
1312 * xs_udp_write_space - callback invoked when socket buffer space
1313 * becomes available
1314 * @sk: socket whose state has changed
1315 *
1316 * Called when more output buffer space is available for this socket.
1317 * We try not to wake our writers until they can make "significant"
1318 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1319 * with a bunch of small requests.
1320 */
1321 static void xs_udp_write_space(struct sock *sk)
1322 {
1323 read_lock(&sk->sk_callback_lock);
1324
1325 /* from net/core/sock.c:sock_def_write_space */
1326 if (sock_writeable(sk))
1327 xs_write_space(sk);
1328
1329 read_unlock(&sk->sk_callback_lock);
1330 }
1331
1332 /**
1333 * xs_tcp_write_space - callback invoked when socket buffer space
1334 * becomes available
1335 * @sk: socket whose state has changed
1336 *
1337 * Called when more output buffer space is available for this socket.
1338 * We try not to wake our writers until they can make "significant"
1339 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1340 * with a bunch of small requests.
1341 */
1342 static void xs_tcp_write_space(struct sock *sk)
1343 {
1344 read_lock(&sk->sk_callback_lock);
1345
1346 /* from net/core/stream.c:sk_stream_write_space */
1347 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1348 xs_write_space(sk);
1349
1350 read_unlock(&sk->sk_callback_lock);
1351 }
1352
1353 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1354 {
1355 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1356 struct sock *sk = transport->inet;
1357
1358 if (transport->rcvsize) {
1359 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1360 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1361 }
1362 if (transport->sndsize) {
1363 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1364 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1365 sk->sk_write_space(sk);
1366 }
1367 }
1368
1369 /**
1370 * xs_udp_set_buffer_size - set send and receive limits
1371 * @xprt: generic transport
1372 * @sndsize: requested size of send buffer, in bytes
1373 * @rcvsize: requested size of receive buffer, in bytes
1374 *
1375 * Set socket send and receive buffer size limits.
1376 */
1377 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1378 {
1379 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1380
1381 transport->sndsize = 0;
1382 if (sndsize)
1383 transport->sndsize = sndsize + 1024;
1384 transport->rcvsize = 0;
1385 if (rcvsize)
1386 transport->rcvsize = rcvsize + 1024;
1387
1388 xs_udp_do_set_buffer_size(xprt);
1389 }
1390
1391 /**
1392 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1393 * @task: task that timed out
1394 *
1395 * Adjust the congestion window after a retransmit timeout has occurred.
1396 */
1397 static void xs_udp_timer(struct rpc_task *task)
1398 {
1399 xprt_adjust_cwnd(task, -ETIMEDOUT);
1400 }
1401
1402 static unsigned short xs_get_random_port(void)
1403 {
1404 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1405 unsigned short rand = (unsigned short) net_random() % range;
1406 return rand + xprt_min_resvport;
1407 }
1408
1409 /**
1410 * xs_set_port - reset the port number in the remote endpoint address
1411 * @xprt: generic transport
1412 * @port: new port number
1413 *
1414 */
1415 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1416 {
1417 struct sockaddr *addr = xs_addr(xprt);
1418
1419 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1420
1421 switch (addr->sa_family) {
1422 case AF_INET:
1423 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1424 break;
1425 case AF_INET6:
1426 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1427 break;
1428 default:
1429 BUG();
1430 }
1431 }
1432
1433 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1434 {
1435 unsigned short port = transport->port;
1436
1437 if (port == 0 && transport->xprt.resvport)
1438 port = xs_get_random_port();
1439 return port;
1440 }
1441
1442 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1443 {
1444 if (transport->port != 0)
1445 transport->port = 0;
1446 if (!transport->xprt.resvport)
1447 return 0;
1448 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1449 return xprt_max_resvport;
1450 return --port;
1451 }
1452
1453 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1454 {
1455 struct sockaddr_in myaddr = {
1456 .sin_family = AF_INET,
1457 };
1458 struct sockaddr_in *sa;
1459 int err, nloop = 0;
1460 unsigned short port = xs_get_srcport(transport, sock);
1461 unsigned short last;
1462
1463 sa = (struct sockaddr_in *)&transport->addr;
1464 myaddr.sin_addr = sa->sin_addr;
1465 do {
1466 myaddr.sin_port = htons(port);
1467 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1468 sizeof(myaddr));
1469 if (port == 0)
1470 break;
1471 if (err == 0) {
1472 transport->port = port;
1473 break;
1474 }
1475 last = port;
1476 port = xs_next_srcport(transport, sock, port);
1477 if (port > last)
1478 nloop++;
1479 } while (err == -EADDRINUSE && nloop != 2);
1480 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1481 __func__, &myaddr.sin_addr,
1482 port, err ? "failed" : "ok", err);
1483 return err;
1484 }
1485
1486 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1487 {
1488 struct sockaddr_in6 myaddr = {
1489 .sin6_family = AF_INET6,
1490 };
1491 struct sockaddr_in6 *sa;
1492 int err, nloop = 0;
1493 unsigned short port = xs_get_srcport(transport, sock);
1494 unsigned short last;
1495
1496 sa = (struct sockaddr_in6 *)&transport->addr;
1497 myaddr.sin6_addr = sa->sin6_addr;
1498 do {
1499 myaddr.sin6_port = htons(port);
1500 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1501 sizeof(myaddr));
1502 if (port == 0)
1503 break;
1504 if (err == 0) {
1505 transport->port = port;
1506 break;
1507 }
1508 last = port;
1509 port = xs_next_srcport(transport, sock, port);
1510 if (port > last)
1511 nloop++;
1512 } while (err == -EADDRINUSE && nloop != 2);
1513 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1514 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1515 return err;
1516 }
1517
1518 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1519 static struct lock_class_key xs_key[2];
1520 static struct lock_class_key xs_slock_key[2];
1521
1522 static inline void xs_reclassify_socket4(struct socket *sock)
1523 {
1524 struct sock *sk = sock->sk;
1525
1526 BUG_ON(sock_owned_by_user(sk));
1527 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1528 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1529 }
1530
1531 static inline void xs_reclassify_socket6(struct socket *sock)
1532 {
1533 struct sock *sk = sock->sk;
1534
1535 BUG_ON(sock_owned_by_user(sk));
1536 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1537 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1538 }
1539 #else
1540 static inline void xs_reclassify_socket4(struct socket *sock)
1541 {
1542 }
1543
1544 static inline void xs_reclassify_socket6(struct socket *sock)
1545 {
1546 }
1547 #endif
1548
1549 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1550 {
1551 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1552
1553 if (!transport->inet) {
1554 struct sock *sk = sock->sk;
1555
1556 write_lock_bh(&sk->sk_callback_lock);
1557
1558 xs_save_old_callbacks(transport, sk);
1559
1560 sk->sk_user_data = xprt;
1561 sk->sk_data_ready = xs_udp_data_ready;
1562 sk->sk_write_space = xs_udp_write_space;
1563 sk->sk_error_report = xs_error_report;
1564 sk->sk_no_check = UDP_CSUM_NORCV;
1565 sk->sk_allocation = GFP_ATOMIC;
1566
1567 xprt_set_connected(xprt);
1568
1569 /* Reset to new socket */
1570 transport->sock = sock;
1571 transport->inet = sk;
1572
1573 write_unlock_bh(&sk->sk_callback_lock);
1574 }
1575 xs_udp_do_set_buffer_size(xprt);
1576 }
1577
1578 /**
1579 * xs_udp_connect_worker4 - set up a UDP socket
1580 * @work: RPC transport to connect
1581 *
1582 * Invoked by a work queue tasklet.
1583 */
1584 static void xs_udp_connect_worker4(struct work_struct *work)
1585 {
1586 struct sock_xprt *transport =
1587 container_of(work, struct sock_xprt, connect_worker.work);
1588 struct rpc_xprt *xprt = &transport->xprt;
1589 struct socket *sock = transport->sock;
1590 int err, status = -EIO;
1591
1592 if (xprt->shutdown)
1593 goto out;
1594
1595 /* Start by resetting any existing state */
1596 xs_reset_transport(transport);
1597
1598 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1599 if (err < 0) {
1600 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1601 goto out;
1602 }
1603 xs_reclassify_socket4(sock);
1604
1605 if (xs_bind4(transport, sock)) {
1606 sock_release(sock);
1607 goto out;
1608 }
1609
1610 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1611 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1612
1613 xs_udp_finish_connecting(xprt, sock);
1614 status = 0;
1615 out:
1616 xprt_clear_connecting(xprt);
1617 xprt_wake_pending_tasks(xprt, status);
1618 }
1619
1620 /**
1621 * xs_udp_connect_worker6 - set up a UDP socket
1622 * @work: RPC transport to connect
1623 *
1624 * Invoked by a work queue tasklet.
1625 */
1626 static void xs_udp_connect_worker6(struct work_struct *work)
1627 {
1628 struct sock_xprt *transport =
1629 container_of(work, struct sock_xprt, connect_worker.work);
1630 struct rpc_xprt *xprt = &transport->xprt;
1631 struct socket *sock = transport->sock;
1632 int err, status = -EIO;
1633
1634 if (xprt->shutdown)
1635 goto out;
1636
1637 /* Start by resetting any existing state */
1638 xs_reset_transport(transport);
1639
1640 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1641 if (err < 0) {
1642 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1643 goto out;
1644 }
1645 xs_reclassify_socket6(sock);
1646
1647 if (xs_bind6(transport, sock) < 0) {
1648 sock_release(sock);
1649 goto out;
1650 }
1651
1652 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1653 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1654
1655 xs_udp_finish_connecting(xprt, sock);
1656 status = 0;
1657 out:
1658 xprt_clear_connecting(xprt);
1659 xprt_wake_pending_tasks(xprt, status);
1660 }
1661
1662 /*
1663 * We need to preserve the port number so the reply cache on the server can
1664 * find our cached RPC replies when we get around to reconnecting.
1665 */
1666 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1667 {
1668 int result;
1669 struct sockaddr any;
1670
1671 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1672
1673 /*
1674 * Disconnect the transport socket by doing a connect operation
1675 * with AF_UNSPEC. This should return immediately...
1676 */
1677 memset(&any, 0, sizeof(any));
1678 any.sa_family = AF_UNSPEC;
1679 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1680 if (!result)
1681 xs_sock_mark_closed(xprt);
1682 else
1683 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1684 result);
1685 }
1686
1687 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1688 {
1689 unsigned int state = transport->inet->sk_state;
1690
1691 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1692 return;
1693 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1694 return;
1695 xs_abort_connection(xprt, transport);
1696 }
1697
1698 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1699 {
1700 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1701
1702 if (!transport->inet) {
1703 struct sock *sk = sock->sk;
1704
1705 write_lock_bh(&sk->sk_callback_lock);
1706
1707 xs_save_old_callbacks(transport, sk);
1708
1709 sk->sk_user_data = xprt;
1710 sk->sk_data_ready = xs_tcp_data_ready;
1711 sk->sk_state_change = xs_tcp_state_change;
1712 sk->sk_write_space = xs_tcp_write_space;
1713 sk->sk_error_report = xs_error_report;
1714 sk->sk_allocation = GFP_ATOMIC;
1715
1716 /* socket options */
1717 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1718 sock_reset_flag(sk, SOCK_LINGER);
1719 tcp_sk(sk)->linger2 = 0;
1720 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1721
1722 xprt_clear_connected(xprt);
1723
1724 /* Reset to new socket */
1725 transport->sock = sock;
1726 transport->inet = sk;
1727
1728 write_unlock_bh(&sk->sk_callback_lock);
1729 }
1730
1731 if (!xprt_bound(xprt))
1732 return -ENOTCONN;
1733
1734 /* Tell the socket layer to start connecting... */
1735 xprt->stat.connect_count++;
1736 xprt->stat.connect_start = jiffies;
1737 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1738 }
1739
1740 /**
1741 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1742 * @xprt: RPC transport to connect
1743 * @transport: socket transport to connect
1744 * @create_sock: function to create a socket of the correct type
1745 *
1746 * Invoked by a work queue tasklet.
1747 */
1748 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1749 struct sock_xprt *transport,
1750 struct socket *(*create_sock)(struct rpc_xprt *,
1751 struct sock_xprt *))
1752 {
1753 struct socket *sock = transport->sock;
1754 int status = -EIO;
1755
1756 if (xprt->shutdown)
1757 goto out;
1758
1759 if (!sock) {
1760 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1761 sock = create_sock(xprt, transport);
1762 if (IS_ERR(sock)) {
1763 status = PTR_ERR(sock);
1764 goto out;
1765 }
1766 } else {
1767 int abort_and_exit;
1768
1769 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1770 &xprt->state);
1771 /* "close" the socket, preserving the local port */
1772 xs_tcp_reuse_connection(xprt, transport);
1773
1774 if (abort_and_exit)
1775 goto out_eagain;
1776 }
1777
1778 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1779 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1780
1781 status = xs_tcp_finish_connecting(xprt, sock);
1782 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1783 xprt, -status, xprt_connected(xprt),
1784 sock->sk->sk_state);
1785 switch (status) {
1786 default:
1787 printk("%s: connect returned unhandled error %d\n",
1788 __func__, status);
1789 case -EADDRNOTAVAIL:
1790 /* We're probably in TIME_WAIT. Get rid of existing socket,
1791 * and retry
1792 */
1793 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1794 xprt_force_disconnect(xprt);
1795 break;
1796 case -ECONNREFUSED:
1797 case -ECONNRESET:
1798 case -ENETUNREACH:
1799 /* retry with existing socket, after a delay */
1800 case 0:
1801 case -EINPROGRESS:
1802 case -EALREADY:
1803 xprt_clear_connecting(xprt);
1804 return;
1805 }
1806 out_eagain:
1807 status = -EAGAIN;
1808 out:
1809 xprt_clear_connecting(xprt);
1810 xprt_wake_pending_tasks(xprt, status);
1811 }
1812
1813 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1814 struct sock_xprt *transport)
1815 {
1816 struct socket *sock;
1817 int err;
1818
1819 /* start from scratch */
1820 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1821 if (err < 0) {
1822 dprintk("RPC: can't create TCP transport socket (%d).\n",
1823 -err);
1824 goto out_err;
1825 }
1826 xs_reclassify_socket4(sock);
1827
1828 if (xs_bind4(transport, sock) < 0) {
1829 sock_release(sock);
1830 goto out_err;
1831 }
1832 return sock;
1833 out_err:
1834 return ERR_PTR(-EIO);
1835 }
1836
1837 /**
1838 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1839 * @work: RPC transport to connect
1840 *
1841 * Invoked by a work queue tasklet.
1842 */
1843 static void xs_tcp_connect_worker4(struct work_struct *work)
1844 {
1845 struct sock_xprt *transport =
1846 container_of(work, struct sock_xprt, connect_worker.work);
1847 struct rpc_xprt *xprt = &transport->xprt;
1848
1849 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1850 }
1851
1852 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1853 struct sock_xprt *transport)
1854 {
1855 struct socket *sock;
1856 int err;
1857
1858 /* start from scratch */
1859 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1860 if (err < 0) {
1861 dprintk("RPC: can't create TCP transport socket (%d).\n",
1862 -err);
1863 goto out_err;
1864 }
1865 xs_reclassify_socket6(sock);
1866
1867 if (xs_bind6(transport, sock) < 0) {
1868 sock_release(sock);
1869 goto out_err;
1870 }
1871 return sock;
1872 out_err:
1873 return ERR_PTR(-EIO);
1874 }
1875
1876 /**
1877 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1878 * @work: RPC transport to connect
1879 *
1880 * Invoked by a work queue tasklet.
1881 */
1882 static void xs_tcp_connect_worker6(struct work_struct *work)
1883 {
1884 struct sock_xprt *transport =
1885 container_of(work, struct sock_xprt, connect_worker.work);
1886 struct rpc_xprt *xprt = &transport->xprt;
1887
1888 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
1889 }
1890
1891 /**
1892 * xs_connect - connect a socket to a remote endpoint
1893 * @task: address of RPC task that manages state of connect request
1894 *
1895 * TCP: If the remote end dropped the connection, delay reconnecting.
1896 *
1897 * UDP socket connects are synchronous, but we use a work queue anyway
1898 * to guarantee that even unprivileged user processes can set up a
1899 * socket on a privileged port.
1900 *
1901 * If a UDP socket connect fails, the delay behavior here prevents
1902 * retry floods (hard mounts).
1903 */
1904 static void xs_connect(struct rpc_task *task)
1905 {
1906 struct rpc_xprt *xprt = task->tk_xprt;
1907 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1908
1909 if (xprt_test_and_set_connecting(xprt))
1910 return;
1911
1912 if (transport->sock != NULL) {
1913 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1914 "seconds\n",
1915 xprt, xprt->reestablish_timeout / HZ);
1916 queue_delayed_work(rpciod_workqueue,
1917 &transport->connect_worker,
1918 xprt->reestablish_timeout);
1919 xprt->reestablish_timeout <<= 1;
1920 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1921 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1922 } else {
1923 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1924 queue_delayed_work(rpciod_workqueue,
1925 &transport->connect_worker, 0);
1926 }
1927 }
1928
1929 static void xs_tcp_connect(struct rpc_task *task)
1930 {
1931 struct rpc_xprt *xprt = task->tk_xprt;
1932
1933 /* Exit if we need to wait for socket shutdown to complete */
1934 if (test_bit(XPRT_CLOSING, &xprt->state))
1935 return;
1936 xs_connect(task);
1937 }
1938
1939 /**
1940 * xs_udp_print_stats - display UDP socket-specifc stats
1941 * @xprt: rpc_xprt struct containing statistics
1942 * @seq: output file
1943 *
1944 */
1945 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1946 {
1947 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1948
1949 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1950 transport->port,
1951 xprt->stat.bind_count,
1952 xprt->stat.sends,
1953 xprt->stat.recvs,
1954 xprt->stat.bad_xids,
1955 xprt->stat.req_u,
1956 xprt->stat.bklog_u);
1957 }
1958
1959 /**
1960 * xs_tcp_print_stats - display TCP socket-specifc stats
1961 * @xprt: rpc_xprt struct containing statistics
1962 * @seq: output file
1963 *
1964 */
1965 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1966 {
1967 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1968 long idle_time = 0;
1969
1970 if (xprt_connected(xprt))
1971 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1972
1973 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1974 transport->port,
1975 xprt->stat.bind_count,
1976 xprt->stat.connect_count,
1977 xprt->stat.connect_time,
1978 idle_time,
1979 xprt->stat.sends,
1980 xprt->stat.recvs,
1981 xprt->stat.bad_xids,
1982 xprt->stat.req_u,
1983 xprt->stat.bklog_u);
1984 }
1985
1986 static struct rpc_xprt_ops xs_udp_ops = {
1987 .set_buffer_size = xs_udp_set_buffer_size,
1988 .reserve_xprt = xprt_reserve_xprt_cong,
1989 .release_xprt = xprt_release_xprt_cong,
1990 .rpcbind = rpcb_getport_async,
1991 .set_port = xs_set_port,
1992 .connect = xs_connect,
1993 .buf_alloc = rpc_malloc,
1994 .buf_free = rpc_free,
1995 .send_request = xs_udp_send_request,
1996 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1997 .timer = xs_udp_timer,
1998 .release_request = xprt_release_rqst_cong,
1999 .close = xs_close,
2000 .destroy = xs_destroy,
2001 .print_stats = xs_udp_print_stats,
2002 };
2003
2004 static struct rpc_xprt_ops xs_tcp_ops = {
2005 .reserve_xprt = xprt_reserve_xprt,
2006 .release_xprt = xs_tcp_release_xprt,
2007 .rpcbind = rpcb_getport_async,
2008 .set_port = xs_set_port,
2009 .connect = xs_tcp_connect,
2010 .buf_alloc = rpc_malloc,
2011 .buf_free = rpc_free,
2012 .send_request = xs_tcp_send_request,
2013 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2014 .close = xs_tcp_close,
2015 .destroy = xs_destroy,
2016 .print_stats = xs_tcp_print_stats,
2017 };
2018
2019 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2020 unsigned int slot_table_size)
2021 {
2022 struct rpc_xprt *xprt;
2023 struct sock_xprt *new;
2024
2025 if (args->addrlen > sizeof(xprt->addr)) {
2026 dprintk("RPC: xs_setup_xprt: address too large\n");
2027 return ERR_PTR(-EBADF);
2028 }
2029
2030 new = kzalloc(sizeof(*new), GFP_KERNEL);
2031 if (new == NULL) {
2032 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2033 "rpc_xprt\n");
2034 return ERR_PTR(-ENOMEM);
2035 }
2036 xprt = &new->xprt;
2037
2038 xprt->max_reqs = slot_table_size;
2039 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2040 if (xprt->slot == NULL) {
2041 kfree(xprt);
2042 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2043 "table\n");
2044 return ERR_PTR(-ENOMEM);
2045 }
2046
2047 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2048 xprt->addrlen = args->addrlen;
2049 if (args->srcaddr)
2050 memcpy(&new->addr, args->srcaddr, args->addrlen);
2051
2052 return xprt;
2053 }
2054
2055 static const struct rpc_timeout xs_udp_default_timeout = {
2056 .to_initval = 5 * HZ,
2057 .to_maxval = 30 * HZ,
2058 .to_increment = 5 * HZ,
2059 .to_retries = 5,
2060 };
2061
2062 /**
2063 * xs_setup_udp - Set up transport to use a UDP socket
2064 * @args: rpc transport creation arguments
2065 *
2066 */
2067 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2068 {
2069 struct sockaddr *addr = args->dstaddr;
2070 struct rpc_xprt *xprt;
2071 struct sock_xprt *transport;
2072
2073 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2074 if (IS_ERR(xprt))
2075 return xprt;
2076 transport = container_of(xprt, struct sock_xprt, xprt);
2077
2078 xprt->prot = IPPROTO_UDP;
2079 xprt->tsh_size = 0;
2080 /* XXX: header size can vary due to auth type, IPv6, etc. */
2081 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2082
2083 xprt->bind_timeout = XS_BIND_TO;
2084 xprt->connect_timeout = XS_UDP_CONN_TO;
2085 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2086 xprt->idle_timeout = XS_IDLE_DISC_TO;
2087
2088 xprt->ops = &xs_udp_ops;
2089
2090 xprt->timeout = &xs_udp_default_timeout;
2091
2092 switch (addr->sa_family) {
2093 case AF_INET:
2094 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2095 xprt_set_bound(xprt);
2096
2097 INIT_DELAYED_WORK(&transport->connect_worker,
2098 xs_udp_connect_worker4);
2099 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2100 break;
2101 case AF_INET6:
2102 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2103 xprt_set_bound(xprt);
2104
2105 INIT_DELAYED_WORK(&transport->connect_worker,
2106 xs_udp_connect_worker6);
2107 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2108 break;
2109 default:
2110 kfree(xprt);
2111 return ERR_PTR(-EAFNOSUPPORT);
2112 }
2113
2114 dprintk("RPC: set up transport to address %s\n",
2115 xprt->address_strings[RPC_DISPLAY_ALL]);
2116
2117 if (try_module_get(THIS_MODULE))
2118 return xprt;
2119
2120 kfree(xprt->slot);
2121 kfree(xprt);
2122 return ERR_PTR(-EINVAL);
2123 }
2124
2125 static const struct rpc_timeout xs_tcp_default_timeout = {
2126 .to_initval = 60 * HZ,
2127 .to_maxval = 60 * HZ,
2128 .to_retries = 2,
2129 };
2130
2131 /**
2132 * xs_setup_tcp - Set up transport to use a TCP socket
2133 * @args: rpc transport creation arguments
2134 *
2135 */
2136 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2137 {
2138 struct sockaddr *addr = args->dstaddr;
2139 struct rpc_xprt *xprt;
2140 struct sock_xprt *transport;
2141
2142 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2143 if (IS_ERR(xprt))
2144 return xprt;
2145 transport = container_of(xprt, struct sock_xprt, xprt);
2146
2147 xprt->prot = IPPROTO_TCP;
2148 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2149 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2150
2151 xprt->bind_timeout = XS_BIND_TO;
2152 xprt->connect_timeout = XS_TCP_CONN_TO;
2153 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2154 xprt->idle_timeout = XS_IDLE_DISC_TO;
2155
2156 xprt->ops = &xs_tcp_ops;
2157 xprt->timeout = &xs_tcp_default_timeout;
2158
2159 switch (addr->sa_family) {
2160 case AF_INET:
2161 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2162 xprt_set_bound(xprt);
2163
2164 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2165 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2166 break;
2167 case AF_INET6:
2168 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2169 xprt_set_bound(xprt);
2170
2171 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2172 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2173 break;
2174 default:
2175 kfree(xprt);
2176 return ERR_PTR(-EAFNOSUPPORT);
2177 }
2178
2179 dprintk("RPC: set up transport to address %s\n",
2180 xprt->address_strings[RPC_DISPLAY_ALL]);
2181
2182 if (try_module_get(THIS_MODULE))
2183 return xprt;
2184
2185 kfree(xprt->slot);
2186 kfree(xprt);
2187 return ERR_PTR(-EINVAL);
2188 }
2189
2190 static struct xprt_class xs_udp_transport = {
2191 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2192 .name = "udp",
2193 .owner = THIS_MODULE,
2194 .ident = IPPROTO_UDP,
2195 .setup = xs_setup_udp,
2196 };
2197
2198 static struct xprt_class xs_tcp_transport = {
2199 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2200 .name = "tcp",
2201 .owner = THIS_MODULE,
2202 .ident = IPPROTO_TCP,
2203 .setup = xs_setup_tcp,
2204 };
2205
2206 /**
2207 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2208 *
2209 */
2210 int init_socket_xprt(void)
2211 {
2212 #ifdef RPC_DEBUG
2213 if (!sunrpc_table_header)
2214 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2215 #endif
2216
2217 xprt_register_transport(&xs_udp_transport);
2218 xprt_register_transport(&xs_tcp_transport);
2219
2220 return 0;
2221 }
2222
2223 /**
2224 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2225 *
2226 */
2227 void cleanup_socket_xprt(void)
2228 {
2229 #ifdef RPC_DEBUG
2230 if (sunrpc_table_header) {
2231 unregister_sysctl_table(sunrpc_table_header);
2232 sunrpc_table_header = NULL;
2233 }
2234 #endif
2235
2236 xprt_unregister_transport(&xs_udp_transport);
2237 xprt_unregister_transport(&xs_tcp_transport);
2238 }
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