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Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes
[firewire-audio.git] / net / sunrpc / xprtsock.c
blobd40ff50887aa468544c500de540d7b6a29108b67
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 static void xs_close(struct rpc_xprt *xprt)
812 {
813 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
814
815 dprintk("RPC: xs_close xprt %p\n", xprt);
816
817 xs_reset_transport(transport);
818
819 smp_mb__before_clear_bit();
820 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
821 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
822 clear_bit(XPRT_CLOSING, &xprt->state);
823 smp_mb__after_clear_bit();
824 xprt_disconnect_done(xprt);
825 }
826
827 /**
828 * xs_destroy - prepare to shutdown a transport
829 * @xprt: doomed transport
830 *
831 */
832 static void xs_destroy(struct rpc_xprt *xprt)
833 {
834 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
835
836 dprintk("RPC: xs_destroy xprt %p\n", xprt);
837
838 cancel_rearming_delayed_work(&transport->connect_worker);
839
840 xs_close(xprt);
841 xs_free_peer_addresses(xprt);
842 kfree(xprt->slot);
843 kfree(xprt);
844 module_put(THIS_MODULE);
845 }
846
847 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
848 {
849 return (struct rpc_xprt *) sk->sk_user_data;
850 }
851
852 /**
853 * xs_udp_data_ready - "data ready" callback for UDP sockets
854 * @sk: socket with data to read
855 * @len: how much data to read
856 *
857 */
858 static void xs_udp_data_ready(struct sock *sk, int len)
859 {
860 struct rpc_task *task;
861 struct rpc_xprt *xprt;
862 struct rpc_rqst *rovr;
863 struct sk_buff *skb;
864 int err, repsize, copied;
865 u32 _xid;
866 __be32 *xp;
867
868 read_lock(&sk->sk_callback_lock);
869 dprintk("RPC: xs_udp_data_ready...\n");
870 if (!(xprt = xprt_from_sock(sk)))
871 goto out;
872
873 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
874 goto out;
875
876 if (xprt->shutdown)
877 goto dropit;
878
879 repsize = skb->len - sizeof(struct udphdr);
880 if (repsize < 4) {
881 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
882 goto dropit;
883 }
884
885 /* Copy the XID from the skb... */
886 xp = skb_header_pointer(skb, sizeof(struct udphdr),
887 sizeof(_xid), &_xid);
888 if (xp == NULL)
889 goto dropit;
890
891 /* Look up and lock the request corresponding to the given XID */
892 spin_lock(&xprt->transport_lock);
893 rovr = xprt_lookup_rqst(xprt, *xp);
894 if (!rovr)
895 goto out_unlock;
896 task = rovr->rq_task;
897
898 if ((copied = rovr->rq_private_buf.buflen) > repsize)
899 copied = repsize;
900
901 /* Suck it into the iovec, verify checksum if not done by hw. */
902 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
903 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
904 goto out_unlock;
905 }
906
907 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
908
909 /* Something worked... */
910 dst_confirm(skb->dst);
911
912 xprt_adjust_cwnd(task, copied);
913 xprt_update_rtt(task);
914 xprt_complete_rqst(task, copied);
915
916 out_unlock:
917 spin_unlock(&xprt->transport_lock);
918 dropit:
919 skb_free_datagram(sk, skb);
920 out:
921 read_unlock(&sk->sk_callback_lock);
922 }
923
924 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
925 {
926 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
927 size_t len, used;
928 char *p;
929
930 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
931 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
932 used = xdr_skb_read_bits(desc, p, len);
933 transport->tcp_offset += used;
934 if (used != len)
935 return;
936
937 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
938 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
939 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
940 else
941 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
942 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
943
944 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
945 transport->tcp_offset = 0;
946
947 /* Sanity check of the record length */
948 if (unlikely(transport->tcp_reclen < 4)) {
949 dprintk("RPC: invalid TCP record fragment length\n");
950 xprt_force_disconnect(xprt);
951 return;
952 }
953 dprintk("RPC: reading TCP record fragment of length %d\n",
954 transport->tcp_reclen);
955 }
956
957 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
958 {
959 if (transport->tcp_offset == transport->tcp_reclen) {
960 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
961 transport->tcp_offset = 0;
962 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
963 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
964 transport->tcp_flags |= TCP_RCV_COPY_XID;
965 transport->tcp_copied = 0;
966 }
967 }
968 }
969
970 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
971 {
972 size_t len, used;
973 char *p;
974
975 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
976 dprintk("RPC: reading XID (%Zu bytes)\n", len);
977 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
978 used = xdr_skb_read_bits(desc, p, len);
979 transport->tcp_offset += used;
980 if (used != len)
981 return;
982 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
983 transport->tcp_flags |= TCP_RCV_COPY_DATA;
984 transport->tcp_copied = 4;
985 dprintk("RPC: reading reply for XID %08x\n",
986 ntohl(transport->tcp_xid));
987 xs_tcp_check_fraghdr(transport);
988 }
989
990 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
991 {
992 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
993 struct rpc_rqst *req;
994 struct xdr_buf *rcvbuf;
995 size_t len;
996 ssize_t r;
997
998 /* Find and lock the request corresponding to this xid */
999 spin_lock(&xprt->transport_lock);
1000 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1001 if (!req) {
1002 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1003 dprintk("RPC: XID %08x request not found!\n",
1004 ntohl(transport->tcp_xid));
1005 spin_unlock(&xprt->transport_lock);
1006 return;
1007 }
1008
1009 rcvbuf = &req->rq_private_buf;
1010 len = desc->count;
1011 if (len > transport->tcp_reclen - transport->tcp_offset) {
1012 struct xdr_skb_reader my_desc;
1013
1014 len = transport->tcp_reclen - transport->tcp_offset;
1015 memcpy(&my_desc, desc, sizeof(my_desc));
1016 my_desc.count = len;
1017 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1018 &my_desc, xdr_skb_read_bits);
1019 desc->count -= r;
1020 desc->offset += r;
1021 } else
1022 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1023 desc, xdr_skb_read_bits);
1024
1025 if (r > 0) {
1026 transport->tcp_copied += r;
1027 transport->tcp_offset += r;
1028 }
1029 if (r != len) {
1030 /* Error when copying to the receive buffer,
1031 * usually because we weren't able to allocate
1032 * additional buffer pages. All we can do now
1033 * is turn off TCP_RCV_COPY_DATA, so the request
1034 * will not receive any additional updates,
1035 * and time out.
1036 * Any remaining data from this record will
1037 * be discarded.
1038 */
1039 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1040 dprintk("RPC: XID %08x truncated request\n",
1041 ntohl(transport->tcp_xid));
1042 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1043 "tcp_offset = %u, tcp_reclen = %u\n",
1044 xprt, transport->tcp_copied,
1045 transport->tcp_offset, transport->tcp_reclen);
1046 goto out;
1047 }
1048
1049 dprintk("RPC: XID %08x read %Zd bytes\n",
1050 ntohl(transport->tcp_xid), r);
1051 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1052 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1053 transport->tcp_offset, transport->tcp_reclen);
1054
1055 if (transport->tcp_copied == req->rq_private_buf.buflen)
1056 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1057 else if (transport->tcp_offset == transport->tcp_reclen) {
1058 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1059 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1060 }
1061
1062 out:
1063 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1064 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1065 spin_unlock(&xprt->transport_lock);
1066 xs_tcp_check_fraghdr(transport);
1067 }
1068
1069 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1070 {
1071 size_t len;
1072
1073 len = transport->tcp_reclen - transport->tcp_offset;
1074 if (len > desc->count)
1075 len = desc->count;
1076 desc->count -= len;
1077 desc->offset += len;
1078 transport->tcp_offset += len;
1079 dprintk("RPC: discarded %Zu bytes\n", len);
1080 xs_tcp_check_fraghdr(transport);
1081 }
1082
1083 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1084 {
1085 struct rpc_xprt *xprt = rd_desc->arg.data;
1086 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1087 struct xdr_skb_reader desc = {
1088 .skb = skb,
1089 .offset = offset,
1090 .count = len,
1091 };
1092
1093 dprintk("RPC: xs_tcp_data_recv started\n");
1094 do {
1095 /* Read in a new fragment marker if necessary */
1096 /* Can we ever really expect to get completely empty fragments? */
1097 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1098 xs_tcp_read_fraghdr(xprt, &desc);
1099 continue;
1100 }
1101 /* Read in the xid if necessary */
1102 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1103 xs_tcp_read_xid(transport, &desc);
1104 continue;
1105 }
1106 /* Read in the request data */
1107 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1108 xs_tcp_read_request(xprt, &desc);
1109 continue;
1110 }
1111 /* Skip over any trailing bytes on short reads */
1112 xs_tcp_read_discard(transport, &desc);
1113 } while (desc.count);
1114 dprintk("RPC: xs_tcp_data_recv done\n");
1115 return len - desc.count;
1116 }
1117
1118 /**
1119 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1120 * @sk: socket with data to read
1121 * @bytes: how much data to read
1122 *
1123 */
1124 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1125 {
1126 struct rpc_xprt *xprt;
1127 read_descriptor_t rd_desc;
1128 int read;
1129
1130 dprintk("RPC: xs_tcp_data_ready...\n");
1131
1132 read_lock(&sk->sk_callback_lock);
1133 if (!(xprt = xprt_from_sock(sk)))
1134 goto out;
1135 if (xprt->shutdown)
1136 goto out;
1137
1138 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1139 rd_desc.arg.data = xprt;
1140 do {
1141 rd_desc.count = 65536;
1142 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1143 } while (read > 0);
1144 out:
1145 read_unlock(&sk->sk_callback_lock);
1146 }
1147
1148 /*
1149 * Do the equivalent of linger/linger2 handling for dealing with
1150 * broken servers that don't close the socket in a timely
1151 * fashion
1152 */
1153 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1154 unsigned long timeout)
1155 {
1156 struct sock_xprt *transport;
1157
1158 if (xprt_test_and_set_connecting(xprt))
1159 return;
1160 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1161 transport = container_of(xprt, struct sock_xprt, xprt);
1162 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1163 timeout);
1164 }
1165
1166 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1167 {
1168 struct sock_xprt *transport;
1169
1170 transport = container_of(xprt, struct sock_xprt, xprt);
1171
1172 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1173 !cancel_delayed_work(&transport->connect_worker))
1174 return;
1175 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1176 xprt_clear_connecting(xprt);
1177 }
1178
1179 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1180 {
1181 smp_mb__before_clear_bit();
1182 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1183 clear_bit(XPRT_CLOSING, &xprt->state);
1184 smp_mb__after_clear_bit();
1185 /* Mark transport as closed and wake up all pending tasks */
1186 xprt_disconnect_done(xprt);
1187 }
1188
1189 /**
1190 * xs_tcp_state_change - callback to handle TCP socket state changes
1191 * @sk: socket whose state has changed
1192 *
1193 */
1194 static void xs_tcp_state_change(struct sock *sk)
1195 {
1196 struct rpc_xprt *xprt;
1197
1198 read_lock(&sk->sk_callback_lock);
1199 if (!(xprt = xprt_from_sock(sk)))
1200 goto out;
1201 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1202 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1203 sk->sk_state, xprt_connected(xprt),
1204 sock_flag(sk, SOCK_DEAD),
1205 sock_flag(sk, SOCK_ZAPPED));
1206
1207 switch (sk->sk_state) {
1208 case TCP_ESTABLISHED:
1209 spin_lock_bh(&xprt->transport_lock);
1210 if (!xprt_test_and_set_connected(xprt)) {
1211 struct sock_xprt *transport = container_of(xprt,
1212 struct sock_xprt, xprt);
1213
1214 /* Reset TCP record info */
1215 transport->tcp_offset = 0;
1216 transport->tcp_reclen = 0;
1217 transport->tcp_copied = 0;
1218 transport->tcp_flags =
1219 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1220
1221 xprt_wake_pending_tasks(xprt, -EAGAIN);
1222 }
1223 spin_unlock_bh(&xprt->transport_lock);
1224 break;
1225 case TCP_FIN_WAIT1:
1226 /* The client initiated a shutdown of the socket */
1227 xprt->connect_cookie++;
1228 xprt->reestablish_timeout = 0;
1229 set_bit(XPRT_CLOSING, &xprt->state);
1230 smp_mb__before_clear_bit();
1231 clear_bit(XPRT_CONNECTED, &xprt->state);
1232 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1233 smp_mb__after_clear_bit();
1234 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1235 break;
1236 case TCP_CLOSE_WAIT:
1237 /* The server initiated a shutdown of the socket */
1238 xprt_force_disconnect(xprt);
1239 case TCP_SYN_SENT:
1240 xprt->connect_cookie++;
1241 case TCP_CLOSING:
1242 /*
1243 * If the server closed down the connection, make sure that
1244 * we back off before reconnecting
1245 */
1246 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1247 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1248 break;
1249 case TCP_LAST_ACK:
1250 set_bit(XPRT_CLOSING, &xprt->state);
1251 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1252 smp_mb__before_clear_bit();
1253 clear_bit(XPRT_CONNECTED, &xprt->state);
1254 smp_mb__after_clear_bit();
1255 break;
1256 case TCP_CLOSE:
1257 xs_tcp_cancel_linger_timeout(xprt);
1258 xs_sock_mark_closed(xprt);
1259 }
1260 out:
1261 read_unlock(&sk->sk_callback_lock);
1262 }
1263
1264 /**
1265 * xs_error_report - callback mainly for catching socket errors
1266 * @sk: socket
1267 */
1268 static void xs_error_report(struct sock *sk)
1269 {
1270 struct rpc_xprt *xprt;
1271
1272 read_lock(&sk->sk_callback_lock);
1273 if (!(xprt = xprt_from_sock(sk)))
1274 goto out;
1275 dprintk("RPC: %s client %p...\n"
1276 "RPC: error %d\n",
1277 __func__, xprt, sk->sk_err);
1278 xprt_wake_pending_tasks(xprt, -EAGAIN);
1279 out:
1280 read_unlock(&sk->sk_callback_lock);
1281 }
1282
1283 static void xs_write_space(struct sock *sk)
1284 {
1285 struct socket *sock;
1286 struct rpc_xprt *xprt;
1287
1288 if (unlikely(!(sock = sk->sk_socket)))
1289 return;
1290 clear_bit(SOCK_NOSPACE, &sock->flags);
1291
1292 if (unlikely(!(xprt = xprt_from_sock(sk))))
1293 return;
1294 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1295 return;
1296
1297 xprt_write_space(xprt);
1298 }
1299
1300 /**
1301 * xs_udp_write_space - callback invoked when socket buffer space
1302 * becomes available
1303 * @sk: socket whose state has changed
1304 *
1305 * Called when more output buffer space is available for this socket.
1306 * We try not to wake our writers until they can make "significant"
1307 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1308 * with a bunch of small requests.
1309 */
1310 static void xs_udp_write_space(struct sock *sk)
1311 {
1312 read_lock(&sk->sk_callback_lock);
1313
1314 /* from net/core/sock.c:sock_def_write_space */
1315 if (sock_writeable(sk))
1316 xs_write_space(sk);
1317
1318 read_unlock(&sk->sk_callback_lock);
1319 }
1320
1321 /**
1322 * xs_tcp_write_space - callback invoked when socket buffer space
1323 * becomes available
1324 * @sk: socket whose state has changed
1325 *
1326 * Called when more output buffer space is available for this socket.
1327 * We try not to wake our writers until they can make "significant"
1328 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1329 * with a bunch of small requests.
1330 */
1331 static void xs_tcp_write_space(struct sock *sk)
1332 {
1333 read_lock(&sk->sk_callback_lock);
1334
1335 /* from net/core/stream.c:sk_stream_write_space */
1336 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1337 xs_write_space(sk);
1338
1339 read_unlock(&sk->sk_callback_lock);
1340 }
1341
1342 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1343 {
1344 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1345 struct sock *sk = transport->inet;
1346
1347 if (transport->rcvsize) {
1348 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1349 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1350 }
1351 if (transport->sndsize) {
1352 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1353 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1354 sk->sk_write_space(sk);
1355 }
1356 }
1357
1358 /**
1359 * xs_udp_set_buffer_size - set send and receive limits
1360 * @xprt: generic transport
1361 * @sndsize: requested size of send buffer, in bytes
1362 * @rcvsize: requested size of receive buffer, in bytes
1363 *
1364 * Set socket send and receive buffer size limits.
1365 */
1366 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1367 {
1368 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1369
1370 transport->sndsize = 0;
1371 if (sndsize)
1372 transport->sndsize = sndsize + 1024;
1373 transport->rcvsize = 0;
1374 if (rcvsize)
1375 transport->rcvsize = rcvsize + 1024;
1376
1377 xs_udp_do_set_buffer_size(xprt);
1378 }
1379
1380 /**
1381 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1382 * @task: task that timed out
1383 *
1384 * Adjust the congestion window after a retransmit timeout has occurred.
1385 */
1386 static void xs_udp_timer(struct rpc_task *task)
1387 {
1388 xprt_adjust_cwnd(task, -ETIMEDOUT);
1389 }
1390
1391 static unsigned short xs_get_random_port(void)
1392 {
1393 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1394 unsigned short rand = (unsigned short) net_random() % range;
1395 return rand + xprt_min_resvport;
1396 }
1397
1398 /**
1399 * xs_set_port - reset the port number in the remote endpoint address
1400 * @xprt: generic transport
1401 * @port: new port number
1402 *
1403 */
1404 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1405 {
1406 struct sockaddr *addr = xs_addr(xprt);
1407
1408 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1409
1410 switch (addr->sa_family) {
1411 case AF_INET:
1412 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1413 break;
1414 case AF_INET6:
1415 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1416 break;
1417 default:
1418 BUG();
1419 }
1420 }
1421
1422 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1423 {
1424 unsigned short port = transport->port;
1425
1426 if (port == 0 && transport->xprt.resvport)
1427 port = xs_get_random_port();
1428 return port;
1429 }
1430
1431 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1432 {
1433 if (transport->port != 0)
1434 transport->port = 0;
1435 if (!transport->xprt.resvport)
1436 return 0;
1437 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1438 return xprt_max_resvport;
1439 return --port;
1440 }
1441
1442 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1443 {
1444 struct sockaddr_in myaddr = {
1445 .sin_family = AF_INET,
1446 };
1447 struct sockaddr_in *sa;
1448 int err, nloop = 0;
1449 unsigned short port = xs_get_srcport(transport, sock);
1450 unsigned short last;
1451
1452 sa = (struct sockaddr_in *)&transport->addr;
1453 myaddr.sin_addr = sa->sin_addr;
1454 do {
1455 myaddr.sin_port = htons(port);
1456 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1457 sizeof(myaddr));
1458 if (port == 0)
1459 break;
1460 if (err == 0) {
1461 transport->port = port;
1462 break;
1463 }
1464 last = port;
1465 port = xs_next_srcport(transport, sock, port);
1466 if (port > last)
1467 nloop++;
1468 } while (err == -EADDRINUSE && nloop != 2);
1469 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1470 __func__, &myaddr.sin_addr,
1471 port, err ? "failed" : "ok", err);
1472 return err;
1473 }
1474
1475 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1476 {
1477 struct sockaddr_in6 myaddr = {
1478 .sin6_family = AF_INET6,
1479 };
1480 struct sockaddr_in6 *sa;
1481 int err, nloop = 0;
1482 unsigned short port = xs_get_srcport(transport, sock);
1483 unsigned short last;
1484
1485 sa = (struct sockaddr_in6 *)&transport->addr;
1486 myaddr.sin6_addr = sa->sin6_addr;
1487 do {
1488 myaddr.sin6_port = htons(port);
1489 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1490 sizeof(myaddr));
1491 if (port == 0)
1492 break;
1493 if (err == 0) {
1494 transport->port = port;
1495 break;
1496 }
1497 last = port;
1498 port = xs_next_srcport(transport, sock, port);
1499 if (port > last)
1500 nloop++;
1501 } while (err == -EADDRINUSE && nloop != 2);
1502 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1503 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1504 return err;
1505 }
1506
1507 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1508 static struct lock_class_key xs_key[2];
1509 static struct lock_class_key xs_slock_key[2];
1510
1511 static inline void xs_reclassify_socket4(struct socket *sock)
1512 {
1513 struct sock *sk = sock->sk;
1514
1515 BUG_ON(sock_owned_by_user(sk));
1516 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1517 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1518 }
1519
1520 static inline void xs_reclassify_socket6(struct socket *sock)
1521 {
1522 struct sock *sk = sock->sk;
1523
1524 BUG_ON(sock_owned_by_user(sk));
1525 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1526 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1527 }
1528 #else
1529 static inline void xs_reclassify_socket4(struct socket *sock)
1530 {
1531 }
1532
1533 static inline void xs_reclassify_socket6(struct socket *sock)
1534 {
1535 }
1536 #endif
1537
1538 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1539 {
1540 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1541
1542 if (!transport->inet) {
1543 struct sock *sk = sock->sk;
1544
1545 write_lock_bh(&sk->sk_callback_lock);
1546
1547 xs_save_old_callbacks(transport, sk);
1548
1549 sk->sk_user_data = xprt;
1550 sk->sk_data_ready = xs_udp_data_ready;
1551 sk->sk_write_space = xs_udp_write_space;
1552 sk->sk_error_report = xs_error_report;
1553 sk->sk_no_check = UDP_CSUM_NORCV;
1554 sk->sk_allocation = GFP_ATOMIC;
1555
1556 xprt_set_connected(xprt);
1557
1558 /* Reset to new socket */
1559 transport->sock = sock;
1560 transport->inet = sk;
1561
1562 write_unlock_bh(&sk->sk_callback_lock);
1563 }
1564 xs_udp_do_set_buffer_size(xprt);
1565 }
1566
1567 /**
1568 * xs_udp_connect_worker4 - set up a UDP socket
1569 * @work: RPC transport to connect
1570 *
1571 * Invoked by a work queue tasklet.
1572 */
1573 static void xs_udp_connect_worker4(struct work_struct *work)
1574 {
1575 struct sock_xprt *transport =
1576 container_of(work, struct sock_xprt, connect_worker.work);
1577 struct rpc_xprt *xprt = &transport->xprt;
1578 struct socket *sock = transport->sock;
1579 int err, status = -EIO;
1580
1581 if (xprt->shutdown)
1582 goto out;
1583
1584 /* Start by resetting any existing state */
1585 xs_reset_transport(transport);
1586
1587 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1588 if (err < 0) {
1589 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1590 goto out;
1591 }
1592 xs_reclassify_socket4(sock);
1593
1594 if (xs_bind4(transport, sock)) {
1595 sock_release(sock);
1596 goto out;
1597 }
1598
1599 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1600 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1601
1602 xs_udp_finish_connecting(xprt, sock);
1603 status = 0;
1604 out:
1605 xprt_clear_connecting(xprt);
1606 xprt_wake_pending_tasks(xprt, status);
1607 }
1608
1609 /**
1610 * xs_udp_connect_worker6 - set up a UDP socket
1611 * @work: RPC transport to connect
1612 *
1613 * Invoked by a work queue tasklet.
1614 */
1615 static void xs_udp_connect_worker6(struct work_struct *work)
1616 {
1617 struct sock_xprt *transport =
1618 container_of(work, struct sock_xprt, connect_worker.work);
1619 struct rpc_xprt *xprt = &transport->xprt;
1620 struct socket *sock = transport->sock;
1621 int err, status = -EIO;
1622
1623 if (xprt->shutdown)
1624 goto out;
1625
1626 /* Start by resetting any existing state */
1627 xs_reset_transport(transport);
1628
1629 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1630 if (err < 0) {
1631 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1632 goto out;
1633 }
1634 xs_reclassify_socket6(sock);
1635
1636 if (xs_bind6(transport, sock) < 0) {
1637 sock_release(sock);
1638 goto out;
1639 }
1640
1641 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1642 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1643
1644 xs_udp_finish_connecting(xprt, sock);
1645 status = 0;
1646 out:
1647 xprt_clear_connecting(xprt);
1648 xprt_wake_pending_tasks(xprt, status);
1649 }
1650
1651 /*
1652 * We need to preserve the port number so the reply cache on the server can
1653 * find our cached RPC replies when we get around to reconnecting.
1654 */
1655 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1656 {
1657 int result;
1658 struct sockaddr any;
1659
1660 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1661
1662 /*
1663 * Disconnect the transport socket by doing a connect operation
1664 * with AF_UNSPEC. This should return immediately...
1665 */
1666 memset(&any, 0, sizeof(any));
1667 any.sa_family = AF_UNSPEC;
1668 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1669 if (!result)
1670 xs_sock_mark_closed(xprt);
1671 else
1672 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1673 result);
1674 }
1675
1676 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1677 {
1678 unsigned int state = transport->inet->sk_state;
1679
1680 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1681 return;
1682 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1683 return;
1684 xs_abort_connection(xprt, transport);
1685 }
1686
1687 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1688 {
1689 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1690
1691 if (!transport->inet) {
1692 struct sock *sk = sock->sk;
1693
1694 write_lock_bh(&sk->sk_callback_lock);
1695
1696 xs_save_old_callbacks(transport, sk);
1697
1698 sk->sk_user_data = xprt;
1699 sk->sk_data_ready = xs_tcp_data_ready;
1700 sk->sk_state_change = xs_tcp_state_change;
1701 sk->sk_write_space = xs_tcp_write_space;
1702 sk->sk_error_report = xs_error_report;
1703 sk->sk_allocation = GFP_ATOMIC;
1704
1705 /* socket options */
1706 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1707 sock_reset_flag(sk, SOCK_LINGER);
1708 tcp_sk(sk)->linger2 = 0;
1709 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1710
1711 xprt_clear_connected(xprt);
1712
1713 /* Reset to new socket */
1714 transport->sock = sock;
1715 transport->inet = sk;
1716
1717 write_unlock_bh(&sk->sk_callback_lock);
1718 }
1719
1720 if (!xprt_bound(xprt))
1721 return -ENOTCONN;
1722
1723 /* Tell the socket layer to start connecting... */
1724 xprt->stat.connect_count++;
1725 xprt->stat.connect_start = jiffies;
1726 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1727 }
1728
1729 /**
1730 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1731 * @xprt: RPC transport to connect
1732 * @transport: socket transport to connect
1733 * @create_sock: function to create a socket of the correct type
1734 *
1735 * Invoked by a work queue tasklet.
1736 */
1737 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1738 struct sock_xprt *transport,
1739 struct socket *(*create_sock)(struct rpc_xprt *,
1740 struct sock_xprt *))
1741 {
1742 struct socket *sock = transport->sock;
1743 int status = -EIO;
1744
1745 if (xprt->shutdown)
1746 goto out;
1747
1748 if (!sock) {
1749 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1750 sock = create_sock(xprt, transport);
1751 if (IS_ERR(sock)) {
1752 status = PTR_ERR(sock);
1753 goto out;
1754 }
1755 } else {
1756 int abort_and_exit;
1757
1758 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1759 &xprt->state);
1760 /* "close" the socket, preserving the local port */
1761 xs_tcp_reuse_connection(xprt, transport);
1762
1763 if (abort_and_exit)
1764 goto out_eagain;
1765 }
1766
1767 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1768 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1769
1770 status = xs_tcp_finish_connecting(xprt, sock);
1771 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1772 xprt, -status, xprt_connected(xprt),
1773 sock->sk->sk_state);
1774 switch (status) {
1775 case -ECONNREFUSED:
1776 case -ECONNRESET:
1777 case -ENETUNREACH:
1778 /* retry with existing socket, after a delay */
1779 case 0:
1780 case -EINPROGRESS:
1781 case -EALREADY:
1782 xprt_clear_connecting(xprt);
1783 return;
1784 }
1785 /* get rid of existing socket, and retry */
1786 xs_tcp_shutdown(xprt);
1787 printk("%s: connect returned unhandled error %d\n",
1788 __func__, status);
1789 out_eagain:
1790 status = -EAGAIN;
1791 out:
1792 xprt_clear_connecting(xprt);
1793 xprt_wake_pending_tasks(xprt, status);
1794 }
1795
1796 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1797 struct sock_xprt *transport)
1798 {
1799 struct socket *sock;
1800 int err;
1801
1802 /* start from scratch */
1803 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1804 if (err < 0) {
1805 dprintk("RPC: can't create TCP transport socket (%d).\n",
1806 -err);
1807 goto out_err;
1808 }
1809 xs_reclassify_socket4(sock);
1810
1811 if (xs_bind4(transport, sock) < 0) {
1812 sock_release(sock);
1813 goto out_err;
1814 }
1815 return sock;
1816 out_err:
1817 return ERR_PTR(-EIO);
1818 }
1819
1820 /**
1821 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1822 * @work: RPC transport to connect
1823 *
1824 * Invoked by a work queue tasklet.
1825 */
1826 static void xs_tcp_connect_worker4(struct work_struct *work)
1827 {
1828 struct sock_xprt *transport =
1829 container_of(work, struct sock_xprt, connect_worker.work);
1830 struct rpc_xprt *xprt = &transport->xprt;
1831
1832 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1833 }
1834
1835 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1836 struct sock_xprt *transport)
1837 {
1838 struct socket *sock;
1839 int err;
1840
1841 /* start from scratch */
1842 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1843 if (err < 0) {
1844 dprintk("RPC: can't create TCP transport socket (%d).\n",
1845 -err);
1846 goto out_err;
1847 }
1848 xs_reclassify_socket6(sock);
1849
1850 if (xs_bind6(transport, sock) < 0) {
1851 sock_release(sock);
1852 goto out_err;
1853 }
1854 return sock;
1855 out_err:
1856 return ERR_PTR(-EIO);
1857 }
1858
1859 /**
1860 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1861 * @work: RPC transport to connect
1862 *
1863 * Invoked by a work queue tasklet.
1864 */
1865 static void xs_tcp_connect_worker6(struct work_struct *work)
1866 {
1867 struct sock_xprt *transport =
1868 container_of(work, struct sock_xprt, connect_worker.work);
1869 struct rpc_xprt *xprt = &transport->xprt;
1870
1871 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
1872 }
1873
1874 /**
1875 * xs_connect - connect a socket to a remote endpoint
1876 * @task: address of RPC task that manages state of connect request
1877 *
1878 * TCP: If the remote end dropped the connection, delay reconnecting.
1879 *
1880 * UDP socket connects are synchronous, but we use a work queue anyway
1881 * to guarantee that even unprivileged user processes can set up a
1882 * socket on a privileged port.
1883 *
1884 * If a UDP socket connect fails, the delay behavior here prevents
1885 * retry floods (hard mounts).
1886 */
1887 static void xs_connect(struct rpc_task *task)
1888 {
1889 struct rpc_xprt *xprt = task->tk_xprt;
1890 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1891
1892 if (xprt_test_and_set_connecting(xprt))
1893 return;
1894
1895 if (transport->sock != NULL) {
1896 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1897 "seconds\n",
1898 xprt, xprt->reestablish_timeout / HZ);
1899 queue_delayed_work(rpciod_workqueue,
1900 &transport->connect_worker,
1901 xprt->reestablish_timeout);
1902 xprt->reestablish_timeout <<= 1;
1903 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1904 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1905 } else {
1906 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1907 queue_delayed_work(rpciod_workqueue,
1908 &transport->connect_worker, 0);
1909 }
1910 }
1911
1912 static void xs_tcp_connect(struct rpc_task *task)
1913 {
1914 struct rpc_xprt *xprt = task->tk_xprt;
1915
1916 /* Exit if we need to wait for socket shutdown to complete */
1917 if (test_bit(XPRT_CLOSING, &xprt->state))
1918 return;
1919 xs_connect(task);
1920 }
1921
1922 /**
1923 * xs_udp_print_stats - display UDP socket-specifc stats
1924 * @xprt: rpc_xprt struct containing statistics
1925 * @seq: output file
1926 *
1927 */
1928 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1929 {
1930 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1931
1932 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1933 transport->port,
1934 xprt->stat.bind_count,
1935 xprt->stat.sends,
1936 xprt->stat.recvs,
1937 xprt->stat.bad_xids,
1938 xprt->stat.req_u,
1939 xprt->stat.bklog_u);
1940 }
1941
1942 /**
1943 * xs_tcp_print_stats - display TCP socket-specifc stats
1944 * @xprt: rpc_xprt struct containing statistics
1945 * @seq: output file
1946 *
1947 */
1948 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1949 {
1950 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1951 long idle_time = 0;
1952
1953 if (xprt_connected(xprt))
1954 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1955
1956 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1957 transport->port,
1958 xprt->stat.bind_count,
1959 xprt->stat.connect_count,
1960 xprt->stat.connect_time,
1961 idle_time,
1962 xprt->stat.sends,
1963 xprt->stat.recvs,
1964 xprt->stat.bad_xids,
1965 xprt->stat.req_u,
1966 xprt->stat.bklog_u);
1967 }
1968
1969 static struct rpc_xprt_ops xs_udp_ops = {
1970 .set_buffer_size = xs_udp_set_buffer_size,
1971 .reserve_xprt = xprt_reserve_xprt_cong,
1972 .release_xprt = xprt_release_xprt_cong,
1973 .rpcbind = rpcb_getport_async,
1974 .set_port = xs_set_port,
1975 .connect = xs_connect,
1976 .buf_alloc = rpc_malloc,
1977 .buf_free = rpc_free,
1978 .send_request = xs_udp_send_request,
1979 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1980 .timer = xs_udp_timer,
1981 .release_request = xprt_release_rqst_cong,
1982 .close = xs_close,
1983 .destroy = xs_destroy,
1984 .print_stats = xs_udp_print_stats,
1985 };
1986
1987 static struct rpc_xprt_ops xs_tcp_ops = {
1988 .reserve_xprt = xprt_reserve_xprt,
1989 .release_xprt = xs_tcp_release_xprt,
1990 .rpcbind = rpcb_getport_async,
1991 .set_port = xs_set_port,
1992 .connect = xs_tcp_connect,
1993 .buf_alloc = rpc_malloc,
1994 .buf_free = rpc_free,
1995 .send_request = xs_tcp_send_request,
1996 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1997 .close = xs_tcp_shutdown,
1998 .destroy = xs_destroy,
1999 .print_stats = xs_tcp_print_stats,
2000 };
2001
2002 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2003 unsigned int slot_table_size)
2004 {
2005 struct rpc_xprt *xprt;
2006 struct sock_xprt *new;
2007
2008 if (args->addrlen > sizeof(xprt->addr)) {
2009 dprintk("RPC: xs_setup_xprt: address too large\n");
2010 return ERR_PTR(-EBADF);
2011 }
2012
2013 new = kzalloc(sizeof(*new), GFP_KERNEL);
2014 if (new == NULL) {
2015 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2016 "rpc_xprt\n");
2017 return ERR_PTR(-ENOMEM);
2018 }
2019 xprt = &new->xprt;
2020
2021 xprt->max_reqs = slot_table_size;
2022 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2023 if (xprt->slot == NULL) {
2024 kfree(xprt);
2025 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2026 "table\n");
2027 return ERR_PTR(-ENOMEM);
2028 }
2029
2030 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2031 xprt->addrlen = args->addrlen;
2032 if (args->srcaddr)
2033 memcpy(&new->addr, args->srcaddr, args->addrlen);
2034
2035 return xprt;
2036 }
2037
2038 static const struct rpc_timeout xs_udp_default_timeout = {
2039 .to_initval = 5 * HZ,
2040 .to_maxval = 30 * HZ,
2041 .to_increment = 5 * HZ,
2042 .to_retries = 5,
2043 };
2044
2045 /**
2046 * xs_setup_udp - Set up transport to use a UDP socket
2047 * @args: rpc transport creation arguments
2048 *
2049 */
2050 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2051 {
2052 struct sockaddr *addr = args->dstaddr;
2053 struct rpc_xprt *xprt;
2054 struct sock_xprt *transport;
2055
2056 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2057 if (IS_ERR(xprt))
2058 return xprt;
2059 transport = container_of(xprt, struct sock_xprt, xprt);
2060
2061 xprt->prot = IPPROTO_UDP;
2062 xprt->tsh_size = 0;
2063 /* XXX: header size can vary due to auth type, IPv6, etc. */
2064 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2065
2066 xprt->bind_timeout = XS_BIND_TO;
2067 xprt->connect_timeout = XS_UDP_CONN_TO;
2068 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2069 xprt->idle_timeout = XS_IDLE_DISC_TO;
2070
2071 xprt->ops = &xs_udp_ops;
2072
2073 xprt->timeout = &xs_udp_default_timeout;
2074
2075 switch (addr->sa_family) {
2076 case AF_INET:
2077 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2078 xprt_set_bound(xprt);
2079
2080 INIT_DELAYED_WORK(&transport->connect_worker,
2081 xs_udp_connect_worker4);
2082 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2083 break;
2084 case AF_INET6:
2085 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2086 xprt_set_bound(xprt);
2087
2088 INIT_DELAYED_WORK(&transport->connect_worker,
2089 xs_udp_connect_worker6);
2090 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2091 break;
2092 default:
2093 kfree(xprt);
2094 return ERR_PTR(-EAFNOSUPPORT);
2095 }
2096
2097 dprintk("RPC: set up transport to address %s\n",
2098 xprt->address_strings[RPC_DISPLAY_ALL]);
2099
2100 if (try_module_get(THIS_MODULE))
2101 return xprt;
2102
2103 kfree(xprt->slot);
2104 kfree(xprt);
2105 return ERR_PTR(-EINVAL);
2106 }
2107
2108 static const struct rpc_timeout xs_tcp_default_timeout = {
2109 .to_initval = 60 * HZ,
2110 .to_maxval = 60 * HZ,
2111 .to_retries = 2,
2112 };
2113
2114 /**
2115 * xs_setup_tcp - Set up transport to use a TCP socket
2116 * @args: rpc transport creation arguments
2117 *
2118 */
2119 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2120 {
2121 struct sockaddr *addr = args->dstaddr;
2122 struct rpc_xprt *xprt;
2123 struct sock_xprt *transport;
2124
2125 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2126 if (IS_ERR(xprt))
2127 return xprt;
2128 transport = container_of(xprt, struct sock_xprt, xprt);
2129
2130 xprt->prot = IPPROTO_TCP;
2131 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2132 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2133
2134 xprt->bind_timeout = XS_BIND_TO;
2135 xprt->connect_timeout = XS_TCP_CONN_TO;
2136 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2137 xprt->idle_timeout = XS_IDLE_DISC_TO;
2138
2139 xprt->ops = &xs_tcp_ops;
2140 xprt->timeout = &xs_tcp_default_timeout;
2141
2142 switch (addr->sa_family) {
2143 case AF_INET:
2144 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2145 xprt_set_bound(xprt);
2146
2147 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2148 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2149 break;
2150 case AF_INET6:
2151 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2152 xprt_set_bound(xprt);
2153
2154 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2155 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2156 break;
2157 default:
2158 kfree(xprt);
2159 return ERR_PTR(-EAFNOSUPPORT);
2160 }
2161
2162 dprintk("RPC: set up transport to address %s\n",
2163 xprt->address_strings[RPC_DISPLAY_ALL]);
2164
2165 if (try_module_get(THIS_MODULE))
2166 return xprt;
2167
2168 kfree(xprt->slot);
2169 kfree(xprt);
2170 return ERR_PTR(-EINVAL);
2171 }
2172
2173 static struct xprt_class xs_udp_transport = {
2174 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2175 .name = "udp",
2176 .owner = THIS_MODULE,
2177 .ident = IPPROTO_UDP,
2178 .setup = xs_setup_udp,
2179 };
2180
2181 static struct xprt_class xs_tcp_transport = {
2182 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2183 .name = "tcp",
2184 .owner = THIS_MODULE,
2185 .ident = IPPROTO_TCP,
2186 .setup = xs_setup_tcp,
2187 };
2188
2189 /**
2190 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2191 *
2192 */
2193 int init_socket_xprt(void)
2194 {
2195 #ifdef RPC_DEBUG
2196 if (!sunrpc_table_header)
2197 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2198 #endif
2199
2200 xprt_register_transport(&xs_udp_transport);
2201 xprt_register_transport(&xs_tcp_transport);
2202
2203 return 0;
2204 }
2205
2206 /**
2207 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2208 *
2209 */
2210 void cleanup_socket_xprt(void)
2211 {
2212 #ifdef RPC_DEBUG
2213 if (sunrpc_table_header) {
2214 unregister_sysctl_table(sunrpc_table_header);
2215 sunrpc_table_header = NULL;
2216 }
2217 #endif
2218
2219 xprt_unregister_transport(&xs_udp_transport);
2220 xprt_unregister_transport(&xs_tcp_transport);
2221 }
AMDTP streaming driver for the Linux FireWire stack (Juju)