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warning removal
[cor_2_6_31.git] / net / sunrpc / xprtsock.c
blob83c73c4d017ad9ec91b4f1895344749c51b9839b
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 #ifdef CONFIG_NFS_V4_1
38 #include <linux/sunrpc/bc_xprt.h>
39 #endif
40
41 #include <net/sock.h>
42 #include <net/checksum.h>
43 #include <net/udp.h>
44 #include <net/tcp.h>
45
46 /*
47 * xprtsock tunables
48 */
49 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
50 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
51
52 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
53 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
54
55 #define XS_TCP_LINGER_TO (15U * HZ)
56 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
57
58 /*
59 * We can register our own files under /proc/sys/sunrpc by
60 * calling register_sysctl_table() again. The files in that
61 * directory become the union of all files registered there.
62 *
63 * We simply need to make sure that we don't collide with
64 * someone else's file names!
65 */
66
67 #ifdef RPC_DEBUG
68
69 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
70 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
71 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
72 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
73
74 static struct ctl_table_header *sunrpc_table_header;
75
76 /*
77 * FIXME: changing the UDP slot table size should also resize the UDP
78 * socket buffers for existing UDP transports
79 */
80 static ctl_table xs_tunables_table[] = {
81 {
82 .ctl_name = CTL_SLOTTABLE_UDP,
83 .procname = "udp_slot_table_entries",
84 .data = &xprt_udp_slot_table_entries,
85 .maxlen = sizeof(unsigned int),
86 .mode = 0644,
87 .proc_handler = &proc_dointvec_minmax,
88 .strategy = &sysctl_intvec,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
91 },
92 {
93 .ctl_name = CTL_SLOTTABLE_TCP,
94 .procname = "tcp_slot_table_entries",
95 .data = &xprt_tcp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = &proc_dointvec_minmax,
99 .strategy = &sysctl_intvec,
100 .extra1 = &min_slot_table_size,
101 .extra2 = &max_slot_table_size
102 },
103 {
104 .ctl_name = CTL_MIN_RESVPORT,
105 .procname = "min_resvport",
106 .data = &xprt_min_resvport,
107 .maxlen = sizeof(unsigned int),
108 .mode = 0644,
109 .proc_handler = &proc_dointvec_minmax,
110 .strategy = &sysctl_intvec,
111 .extra1 = &xprt_min_resvport_limit,
112 .extra2 = &xprt_max_resvport_limit
113 },
114 {
115 .ctl_name = CTL_MAX_RESVPORT,
116 .procname = "max_resvport",
117 .data = &xprt_max_resvport,
118 .maxlen = sizeof(unsigned int),
119 .mode = 0644,
120 .proc_handler = &proc_dointvec_minmax,
121 .strategy = &sysctl_intvec,
122 .extra1 = &xprt_min_resvport_limit,
123 .extra2 = &xprt_max_resvport_limit
124 },
125 {
126 .procname = "tcp_fin_timeout",
127 .data = &xs_tcp_fin_timeout,
128 .maxlen = sizeof(xs_tcp_fin_timeout),
129 .mode = 0644,
130 .proc_handler = &proc_dointvec_jiffies,
131 .strategy = sysctl_jiffies
132 },
133 {
134 .ctl_name = 0,
135 },
136 };
137
138 static ctl_table sunrpc_table[] = {
139 {
140 .ctl_name = CTL_SUNRPC,
141 .procname = "sunrpc",
142 .mode = 0555,
143 .child = xs_tunables_table
144 },
145 {
146 .ctl_name = 0,
147 },
148 };
149
150 #endif
151
152 /*
153 * Time out for an RPC UDP socket connect. UDP socket connects are
154 * synchronous, but we set a timeout anyway in case of resource
155 * exhaustion on the local host.
156 */
157 #define XS_UDP_CONN_TO (5U * HZ)
158
159 /*
160 * Wait duration for an RPC TCP connection to be established. Solaris
161 * NFS over TCP uses 60 seconds, for example, which is in line with how
162 * long a server takes to reboot.
163 */
164 #define XS_TCP_CONN_TO (60U * HZ)
165
166 /*
167 * Wait duration for a reply from the RPC portmapper.
168 */
169 #define XS_BIND_TO (60U * HZ)
170
171 /*
172 * Delay if a UDP socket connect error occurs. This is most likely some
173 * kind of resource problem on the local host.
174 */
175 #define XS_UDP_REEST_TO (2U * HZ)
176
177 /*
178 * The reestablish timeout allows clients to delay for a bit before attempting
179 * to reconnect to a server that just dropped our connection.
180 *
181 * We implement an exponential backoff when trying to reestablish a TCP
182 * transport connection with the server. Some servers like to drop a TCP
183 * connection when they are overworked, so we start with a short timeout and
184 * increase over time if the server is down or not responding.
185 */
186 #define XS_TCP_INIT_REEST_TO (3U * HZ)
187 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
188
189 /*
190 * TCP idle timeout; client drops the transport socket if it is idle
191 * for this long. Note that we also timeout UDP sockets to prevent
192 * holding port numbers when there is no RPC traffic.
193 */
194 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
195
196 #ifdef RPC_DEBUG
197 # undef RPC_DEBUG_DATA
198 # define RPCDBG_FACILITY RPCDBG_TRANS
199 #endif
200
201 #ifdef RPC_DEBUG_DATA
202 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
203 {
204 u8 *buf = (u8 *) packet;
205 int j;
206
207 dprintk("RPC: %s\n", msg);
208 for (j = 0; j < count && j < 128; j += 4) {
209 if (!(j & 31)) {
210 if (j)
211 dprintk("\n");
212 dprintk("0x%04x ", j);
213 }
214 dprintk("%02x%02x%02x%02x ",
215 buf[j], buf[j+1], buf[j+2], buf[j+3]);
216 }
217 dprintk("\n");
218 }
219 #else
220 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
221 {
222 /* NOP */
223 }
224 #endif
225
226 struct sock_xprt {
227 struct rpc_xprt xprt;
228
229 /*
230 * Network layer
231 */
232 struct socket * sock;
233 struct sock * inet;
234
235 /*
236 * State of TCP reply receive
237 */
238 __be32 tcp_fraghdr,
239 tcp_xid;
240
241 u32 tcp_offset,
242 tcp_reclen;
243
244 unsigned long tcp_copied,
245 tcp_flags;
246
247 /*
248 * Connection of transports
249 */
250 struct delayed_work connect_worker;
251 struct sockaddr_storage addr;
252 unsigned short port;
253
254 /*
255 * UDP socket buffer size parameters
256 */
257 size_t rcvsize,
258 sndsize;
259
260 /*
261 * Saved socket callback addresses
262 */
263 void (*old_data_ready)(struct sock *, int);
264 void (*old_state_change)(struct sock *);
265 void (*old_write_space)(struct sock *);
266 void (*old_error_report)(struct sock *);
267 };
268
269 /*
270 * TCP receive state flags
271 */
272 #define TCP_RCV_LAST_FRAG (1UL << 0)
273 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
274 #define TCP_RCV_COPY_XID (1UL << 2)
275 #define TCP_RCV_COPY_DATA (1UL << 3)
276 #define TCP_RCV_READ_CALLDIR (1UL << 4)
277 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
278
279 /*
280 * TCP RPC flags
281 */
282 #define TCP_RPC_REPLY (1UL << 6)
283
284 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
285 {
286 return (struct sockaddr *) &xprt->addr;
287 }
288
289 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
290 {
291 return (struct sockaddr_in *) &xprt->addr;
292 }
293
294 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
295 {
296 return (struct sockaddr_in6 *) &xprt->addr;
297 }
298
299 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
300 const char *protocol,
301 const char *netid)
302 {
303 struct sockaddr_in *addr = xs_addr_in(xprt);
304 char *buf;
305
306 buf = kzalloc(20, GFP_KERNEL);
307 if (buf) {
308 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
309 }
310 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
311
312 buf = kzalloc(8, GFP_KERNEL);
313 if (buf) {
314 snprintf(buf, 8, "%u",
315 ntohs(addr->sin_port));
316 }
317 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
318
319 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
320
321 buf = kzalloc(48, GFP_KERNEL);
322 if (buf) {
323 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s",
324 &addr->sin_addr.s_addr,
325 ntohs(addr->sin_port),
326 protocol);
327 }
328 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
329
330 buf = kzalloc(10, GFP_KERNEL);
331 if (buf) {
332 snprintf(buf, 10, "%02x%02x%02x%02x",
333 NIPQUAD(addr->sin_addr.s_addr));
334 }
335 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
336
337 buf = kzalloc(8, GFP_KERNEL);
338 if (buf) {
339 snprintf(buf, 8, "%4hx",
340 ntohs(addr->sin_port));
341 }
342 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
343
344 buf = kzalloc(30, GFP_KERNEL);
345 if (buf) {
346 snprintf(buf, 30, "%pI4.%u.%u",
347 &addr->sin_addr.s_addr,
348 ntohs(addr->sin_port) >> 8,
349 ntohs(addr->sin_port) & 0xff);
350 }
351 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
352
353 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
354 }
355
356 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
357 const char *protocol,
358 const char *netid)
359 {
360 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
361 char *buf;
362
363 buf = kzalloc(40, GFP_KERNEL);
364 if (buf) {
365 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
366 }
367 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
368
369 buf = kzalloc(8, GFP_KERNEL);
370 if (buf) {
371 snprintf(buf, 8, "%u",
372 ntohs(addr->sin6_port));
373 }
374 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
375
376 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
377
378 buf = kzalloc(64, GFP_KERNEL);
379 if (buf) {
380 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
381 &addr->sin6_addr,
382 ntohs(addr->sin6_port),
383 protocol);
384 }
385 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
386
387 buf = kzalloc(36, GFP_KERNEL);
388 if (buf)
389 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
390
391 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
392
393 buf = kzalloc(8, GFP_KERNEL);
394 if (buf) {
395 snprintf(buf, 8, "%4hx",
396 ntohs(addr->sin6_port));
397 }
398 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
399
400 buf = kzalloc(50, GFP_KERNEL);
401 if (buf) {
402 snprintf(buf, 50, "%pI6.%u.%u",
403 &addr->sin6_addr,
404 ntohs(addr->sin6_port) >> 8,
405 ntohs(addr->sin6_port) & 0xff);
406 }
407 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
408
409 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
410 }
411
412 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
413 {
414 unsigned int i;
415
416 for (i = 0; i < RPC_DISPLAY_MAX; i++)
417 switch (i) {
418 case RPC_DISPLAY_PROTO:
419 case RPC_DISPLAY_NETID:
420 continue;
421 default:
422 kfree(xprt->address_strings[i]);
423 }
424 }
425
426 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
427
428 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
429 {
430 struct msghdr msg = {
431 .msg_name = addr,
432 .msg_namelen = addrlen,
433 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
434 };
435 struct kvec iov = {
436 .iov_base = vec->iov_base + base,
437 .iov_len = vec->iov_len - base,
438 };
439
440 if (iov.iov_len != 0)
441 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
442 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
443 }
444
445 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
446 {
447 struct page **ppage;
448 unsigned int remainder;
449 int err, sent = 0;
450
451 remainder = xdr->page_len - base;
452 base += xdr->page_base;
453 ppage = xdr->pages + (base >> PAGE_SHIFT);
454 base &= ~PAGE_MASK;
455 for(;;) {
456 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
457 int flags = XS_SENDMSG_FLAGS;
458
459 remainder -= len;
460 if (remainder != 0 || more)
461 flags |= MSG_MORE;
462 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
463 if (remainder == 0 || err != len)
464 break;
465 sent += err;
466 ppage++;
467 base = 0;
468 }
469 if (sent == 0)
470 return err;
471 if (err > 0)
472 sent += err;
473 return sent;
474 }
475
476 /**
477 * xs_sendpages - write pages directly to a socket
478 * @sock: socket to send on
479 * @addr: UDP only -- address of destination
480 * @addrlen: UDP only -- length of destination address
481 * @xdr: buffer containing this request
482 * @base: starting position in the buffer
483 *
484 */
485 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
486 {
487 unsigned int remainder = xdr->len - base;
488 int err, sent = 0;
489
490 if (unlikely(!sock))
491 return -ENOTSOCK;
492
493 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
494 if (base != 0) {
495 addr = NULL;
496 addrlen = 0;
497 }
498
499 if (base < xdr->head[0].iov_len || addr != NULL) {
500 unsigned int len = xdr->head[0].iov_len - base;
501 remainder -= len;
502 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
503 if (remainder == 0 || err != len)
504 goto out;
505 sent += err;
506 base = 0;
507 } else
508 base -= xdr->head[0].iov_len;
509
510 if (base < xdr->page_len) {
511 unsigned int len = xdr->page_len - base;
512 remainder -= len;
513 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
514 if (remainder == 0 || err != len)
515 goto out;
516 sent += err;
517 base = 0;
518 } else
519 base -= xdr->page_len;
520
521 if (base >= xdr->tail[0].iov_len)
522 return sent;
523 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
524 out:
525 if (sent == 0)
526 return err;
527 if (err > 0)
528 sent += err;
529 return sent;
530 }
531
532 static void xs_nospace_callback(struct rpc_task *task)
533 {
534 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
535
536 transport->inet->sk_write_pending--;
537 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
538 }
539
540 /**
541 * xs_nospace - place task on wait queue if transmit was incomplete
542 * @task: task to put to sleep
543 *
544 */
545 static int xs_nospace(struct rpc_task *task)
546 {
547 struct rpc_rqst *req = task->tk_rqstp;
548 struct rpc_xprt *xprt = req->rq_xprt;
549 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
550 int ret = 0;
551
552 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
553 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
554 req->rq_slen);
555
556 /* Protect against races with write_space */
557 spin_lock_bh(&xprt->transport_lock);
558
559 /* Don't race with disconnect */
560 if (xprt_connected(xprt)) {
561 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
562 ret = -EAGAIN;
563 /*
564 * Notify TCP that we're limited by the application
565 * window size
566 */
567 set_bit(SOCK_NOSPACE, &transport->sock->flags);
568 transport->inet->sk_write_pending++;
569 /* ...and wait for more buffer space */
570 xprt_wait_for_buffer_space(task, xs_nospace_callback);
571 }
572 } else {
573 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
574 ret = -ENOTCONN;
575 }
576
577 spin_unlock_bh(&xprt->transport_lock);
578 return ret;
579 }
580
581 /**
582 * xs_udp_send_request - write an RPC request to a UDP socket
583 * @task: address of RPC task that manages the state of an RPC request
584 *
585 * Return values:
586 * 0: The request has been sent
587 * EAGAIN: The socket was blocked, please call again later to
588 * complete the request
589 * ENOTCONN: Caller needs to invoke connect logic then call again
590 * other: Some other error occured, the request was not sent
591 */
592 static int xs_udp_send_request(struct rpc_task *task)
593 {
594 struct rpc_rqst *req = task->tk_rqstp;
595 struct rpc_xprt *xprt = req->rq_xprt;
596 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
597 struct xdr_buf *xdr = &req->rq_snd_buf;
598 int status;
599
600 xs_pktdump("packet data:",
601 req->rq_svec->iov_base,
602 req->rq_svec->iov_len);
603
604 if (!xprt_bound(xprt))
605 return -ENOTCONN;
606 status = xs_sendpages(transport->sock,
607 xs_addr(xprt),
608 xprt->addrlen, xdr,
609 req->rq_bytes_sent);
610
611 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
612 xdr->len - req->rq_bytes_sent, status);
613
614 if (status >= 0) {
615 task->tk_bytes_sent += status;
616 if (status >= req->rq_slen)
617 return 0;
618 /* Still some bytes left; set up for a retry later. */
619 status = -EAGAIN;
620 }
621 if (!transport->sock)
622 goto out;
623
624 switch (status) {
625 case -ENOTSOCK:
626 status = -ENOTCONN;
627 /* Should we call xs_close() here? */
628 break;
629 case -EAGAIN:
630 status = xs_nospace(task);
631 break;
632 default:
633 dprintk("RPC: sendmsg returned unrecognized error %d\n",
634 -status);
635 case -ENETUNREACH:
636 case -EPIPE:
637 case -ECONNREFUSED:
638 /* When the server has died, an ICMP port unreachable message
639 * prompts ECONNREFUSED. */
640 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
641 }
642 out:
643 return status;
644 }
645
646 /**
647 * xs_tcp_shutdown - gracefully shut down a TCP socket
648 * @xprt: transport
649 *
650 * Initiates a graceful shutdown of the TCP socket by calling the
651 * equivalent of shutdown(SHUT_WR);
652 */
653 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
654 {
655 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
656 struct socket *sock = transport->sock;
657
658 if (sock != NULL)
659 kernel_sock_shutdown(sock, SHUT_WR);
660 }
661
662 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
663 {
664 u32 reclen = buf->len - sizeof(rpc_fraghdr);
665 rpc_fraghdr *base = buf->head[0].iov_base;
666 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
667 }
668
669 /**
670 * xs_tcp_send_request - write an RPC request to a TCP socket
671 * @task: address of RPC task that manages the state of an RPC request
672 *
673 * Return values:
674 * 0: The request has been sent
675 * EAGAIN: The socket was blocked, please call again later to
676 * complete the request
677 * ENOTCONN: Caller needs to invoke connect logic then call again
678 * other: Some other error occured, the request was not sent
679 *
680 * XXX: In the case of soft timeouts, should we eventually give up
681 * if sendmsg is not able to make progress?
682 */
683 static int xs_tcp_send_request(struct rpc_task *task)
684 {
685 struct rpc_rqst *req = task->tk_rqstp;
686 struct rpc_xprt *xprt = req->rq_xprt;
687 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
688 struct xdr_buf *xdr = &req->rq_snd_buf;
689 int status;
690
691 xs_encode_tcp_record_marker(&req->rq_snd_buf);
692
693 xs_pktdump("packet data:",
694 req->rq_svec->iov_base,
695 req->rq_svec->iov_len);
696
697 /* Continue transmitting the packet/record. We must be careful
698 * to cope with writespace callbacks arriving _after_ we have
699 * called sendmsg(). */
700 while (1) {
701 status = xs_sendpages(transport->sock,
702 NULL, 0, xdr, req->rq_bytes_sent);
703
704 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
705 xdr->len - req->rq_bytes_sent, status);
706
707 if (unlikely(status < 0))
708 break;
709
710 /* If we've sent the entire packet, immediately
711 * reset the count of bytes sent. */
712 req->rq_bytes_sent += status;
713 task->tk_bytes_sent += status;
714 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
715 req->rq_bytes_sent = 0;
716 return 0;
717 }
718
719 if (status != 0)
720 continue;
721 status = -EAGAIN;
722 break;
723 }
724 if (!transport->sock)
725 goto out;
726
727 switch (status) {
728 case -ENOTSOCK:
729 status = -ENOTCONN;
730 /* Should we call xs_close() here? */
731 break;
732 case -EAGAIN:
733 status = xs_nospace(task);
734 break;
735 default:
736 dprintk("RPC: sendmsg returned unrecognized error %d\n",
737 -status);
738 case -ECONNRESET:
739 case -EPIPE:
740 xs_tcp_shutdown(xprt);
741 case -ECONNREFUSED:
742 case -ENOTCONN:
743 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
744 }
745 out:
746 return status;
747 }
748
749 /**
750 * xs_tcp_release_xprt - clean up after a tcp transmission
751 * @xprt: transport
752 * @task: rpc task
753 *
754 * This cleans up if an error causes us to abort the transmission of a request.
755 * In this case, the socket may need to be reset in order to avoid confusing
756 * the server.
757 */
758 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
759 {
760 struct rpc_rqst *req;
761
762 if (task != xprt->snd_task)
763 return;
764 if (task == NULL)
765 goto out_release;
766 req = task->tk_rqstp;
767 if (req->rq_bytes_sent == 0)
768 goto out_release;
769 if (req->rq_bytes_sent == req->rq_snd_buf.len)
770 goto out_release;
771 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
772 out_release:
773 xprt_release_xprt(xprt, task);
774 }
775
776 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
777 {
778 transport->old_data_ready = sk->sk_data_ready;
779 transport->old_state_change = sk->sk_state_change;
780 transport->old_write_space = sk->sk_write_space;
781 transport->old_error_report = sk->sk_error_report;
782 }
783
784 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
785 {
786 sk->sk_data_ready = transport->old_data_ready;
787 sk->sk_state_change = transport->old_state_change;
788 sk->sk_write_space = transport->old_write_space;
789 sk->sk_error_report = transport->old_error_report;
790 }
791
792 static void xs_reset_transport(struct sock_xprt *transport)
793 {
794 struct socket *sock = transport->sock;
795 struct sock *sk = transport->inet;
796
797 if (sk == NULL)
798 return;
799
800 write_lock_bh(&sk->sk_callback_lock);
801 transport->inet = NULL;
802 transport->sock = NULL;
803
804 sk->sk_user_data = NULL;
805
806 xs_restore_old_callbacks(transport, sk);
807 write_unlock_bh(&sk->sk_callback_lock);
808
809 sk->sk_no_check = 0;
810
811 sock_release(sock);
812 }
813
814 /**
815 * xs_close - close a socket
816 * @xprt: transport
817 *
818 * This is used when all requests are complete; ie, no DRC state remains
819 * on the server we want to save.
820 *
821 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
822 * xs_reset_transport() zeroing the socket from underneath a writer.
823 */
824 static void xs_close(struct rpc_xprt *xprt)
825 {
826 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
827
828 dprintk("RPC: xs_close xprt %p\n", xprt);
829
830 xs_reset_transport(transport);
831
832 smp_mb__before_clear_bit();
833 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
834 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
835 clear_bit(XPRT_CLOSING, &xprt->state);
836 smp_mb__after_clear_bit();
837 xprt_disconnect_done(xprt);
838 }
839
840 static void xs_tcp_close(struct rpc_xprt *xprt)
841 {
842 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
843 xs_close(xprt);
844 else
845 xs_tcp_shutdown(xprt);
846 }
847
848 /**
849 * xs_destroy - prepare to shutdown a transport
850 * @xprt: doomed transport
851 *
852 */
853 static void xs_destroy(struct rpc_xprt *xprt)
854 {
855 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
856
857 dprintk("RPC: xs_destroy xprt %p\n", xprt);
858
859 cancel_rearming_delayed_work(&transport->connect_worker);
860
861 xs_close(xprt);
862 xs_free_peer_addresses(xprt);
863 kfree(xprt->slot);
864 kfree(xprt);
865 module_put(THIS_MODULE);
866 }
867
868 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
869 {
870 return (struct rpc_xprt *) sk->sk_user_data;
871 }
872
873 /**
874 * xs_udp_data_ready - "data ready" callback for UDP sockets
875 * @sk: socket with data to read
876 * @len: how much data to read
877 *
878 */
879 static void xs_udp_data_ready(struct sock *sk, int len)
880 {
881 struct rpc_task *task;
882 struct rpc_xprt *xprt;
883 struct rpc_rqst *rovr;
884 struct sk_buff *skb;
885 int err, repsize, copied;
886 u32 _xid;
887 __be32 *xp;
888
889 read_lock(&sk->sk_callback_lock);
890 dprintk("RPC: xs_udp_data_ready...\n");
891 if (!(xprt = xprt_from_sock(sk)))
892 goto out;
893
894 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
895 goto out;
896
897 if (xprt->shutdown)
898 goto dropit;
899
900 repsize = skb->len - sizeof(struct udphdr);
901 if (repsize < 4) {
902 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
903 goto dropit;
904 }
905
906 /* Copy the XID from the skb... */
907 xp = skb_header_pointer(skb, sizeof(struct udphdr),
908 sizeof(_xid), &_xid);
909 if (xp == NULL)
910 goto dropit;
911
912 /* Look up and lock the request corresponding to the given XID */
913 spin_lock(&xprt->transport_lock);
914 rovr = xprt_lookup_rqst(xprt, *xp);
915 if (!rovr)
916 goto out_unlock;
917 task = rovr->rq_task;
918
919 if ((copied = rovr->rq_private_buf.buflen) > repsize)
920 copied = repsize;
921
922 /* Suck it into the iovec, verify checksum if not done by hw. */
923 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
924 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
925 goto out_unlock;
926 }
927
928 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
929
930 /* Something worked... */
931 dst_confirm(skb_dst(skb));
932
933 xprt_adjust_cwnd(task, copied);
934 xprt_update_rtt(task);
935 xprt_complete_rqst(task, copied);
936
937 out_unlock:
938 spin_unlock(&xprt->transport_lock);
939 dropit:
940 skb_free_datagram(sk, skb);
941 out:
942 read_unlock(&sk->sk_callback_lock);
943 }
944
945 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
946 {
947 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
948 size_t len, used;
949 char *p;
950
951 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
952 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
953 used = xdr_skb_read_bits(desc, p, len);
954 transport->tcp_offset += used;
955 if (used != len)
956 return;
957
958 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
959 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
960 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
961 else
962 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
963 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
964
965 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
966 transport->tcp_offset = 0;
967
968 /* Sanity check of the record length */
969 if (unlikely(transport->tcp_reclen < 8)) {
970 dprintk("RPC: invalid TCP record fragment length\n");
971 xprt_force_disconnect(xprt);
972 return;
973 }
974 dprintk("RPC: reading TCP record fragment of length %d\n",
975 transport->tcp_reclen);
976 }
977
978 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
979 {
980 if (transport->tcp_offset == transport->tcp_reclen) {
981 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
982 transport->tcp_offset = 0;
983 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
984 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
985 transport->tcp_flags |= TCP_RCV_COPY_XID;
986 transport->tcp_copied = 0;
987 }
988 }
989 }
990
991 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
992 {
993 size_t len, used;
994 char *p;
995
996 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
997 dprintk("RPC: reading XID (%Zu bytes)\n", len);
998 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
999 used = xdr_skb_read_bits(desc, p, len);
1000 transport->tcp_offset += used;
1001 if (used != len)
1002 return;
1003 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1004 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1005 transport->tcp_copied = 4;
1006 dprintk("RPC: reading %s XID %08x\n",
1007 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1008 : "request with",
1009 ntohl(transport->tcp_xid));
1010 xs_tcp_check_fraghdr(transport);
1011 }
1012
1013 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1014 struct xdr_skb_reader *desc)
1015 {
1016 size_t len, used;
1017 u32 offset;
1018 __be32 calldir;
1019
1020 /*
1021 * We want transport->tcp_offset to be 8 at the end of this routine
1022 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1023 * When this function is called for the first time,
1024 * transport->tcp_offset is 4 (after having already read the xid).
1025 */
1026 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1027 len = sizeof(calldir) - offset;
1028 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1029 used = xdr_skb_read_bits(desc, &calldir, len);
1030 transport->tcp_offset += used;
1031 if (used != len)
1032 return;
1033 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1034 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1035 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1036 /*
1037 * We don't yet have the XDR buffer, so we will write the calldir
1038 * out after we get the buffer from the 'struct rpc_rqst'
1039 */
1040 if (ntohl(calldir) == RPC_REPLY)
1041 transport->tcp_flags |= TCP_RPC_REPLY;
1042 else
1043 transport->tcp_flags &= ~TCP_RPC_REPLY;
1044 dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
1045 (transport->tcp_flags & TCP_RPC_REPLY) ?
1046 "reply for" : "request with", calldir);
1047 xs_tcp_check_fraghdr(transport);
1048 }
1049
1050 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1051 struct xdr_skb_reader *desc,
1052 struct rpc_rqst *req)
1053 {
1054 struct sock_xprt *transport =
1055 container_of(xprt, struct sock_xprt, xprt);
1056 struct xdr_buf *rcvbuf;
1057 size_t len;
1058 ssize_t r;
1059
1060 rcvbuf = &req->rq_private_buf;
1061
1062 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1063 /*
1064 * Save the RPC direction in the XDR buffer
1065 */
1066 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
1067 htonl(RPC_REPLY) : 0;
1068
1069 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1070 &calldir, sizeof(calldir));
1071 transport->tcp_copied += sizeof(calldir);
1072 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1073 }
1074
1075 len = desc->count;
1076 if (len > transport->tcp_reclen - transport->tcp_offset) {
1077 struct xdr_skb_reader my_desc;
1078
1079 len = transport->tcp_reclen - transport->tcp_offset;
1080 memcpy(&my_desc, desc, sizeof(my_desc));
1081 my_desc.count = len;
1082 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1083 &my_desc, xdr_skb_read_bits);
1084 desc->count -= r;
1085 desc->offset += r;
1086 } else
1087 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1088 desc, xdr_skb_read_bits);
1089
1090 if (r > 0) {
1091 transport->tcp_copied += r;
1092 transport->tcp_offset += r;
1093 }
1094 if (r != len) {
1095 /* Error when copying to the receive buffer,
1096 * usually because we weren't able to allocate
1097 * additional buffer pages. All we can do now
1098 * is turn off TCP_RCV_COPY_DATA, so the request
1099 * will not receive any additional updates,
1100 * and time out.
1101 * Any remaining data from this record will
1102 * be discarded.
1103 */
1104 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1105 dprintk("RPC: XID %08x truncated request\n",
1106 ntohl(transport->tcp_xid));
1107 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1108 "tcp_offset = %u, tcp_reclen = %u\n",
1109 xprt, transport->tcp_copied,
1110 transport->tcp_offset, transport->tcp_reclen);
1111 return;
1112 }
1113
1114 dprintk("RPC: XID %08x read %Zd bytes\n",
1115 ntohl(transport->tcp_xid), r);
1116 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1117 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1118 transport->tcp_offset, transport->tcp_reclen);
1119
1120 if (transport->tcp_copied == req->rq_private_buf.buflen)
1121 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1122 else if (transport->tcp_offset == transport->tcp_reclen) {
1123 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1124 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1125 }
1126
1127 return;
1128 }
1129
1130 /*
1131 * Finds the request corresponding to the RPC xid and invokes the common
1132 * tcp read code to read the data.
1133 */
1134 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1135 struct xdr_skb_reader *desc)
1136 {
1137 struct sock_xprt *transport =
1138 container_of(xprt, struct sock_xprt, xprt);
1139 struct rpc_rqst *req;
1140
1141 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1142
1143 /* Find and lock the request corresponding to this xid */
1144 spin_lock(&xprt->transport_lock);
1145 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1146 if (!req) {
1147 dprintk("RPC: XID %08x request not found!\n",
1148 ntohl(transport->tcp_xid));
1149 spin_unlock(&xprt->transport_lock);
1150 return -1;
1151 }
1152
1153 xs_tcp_read_common(xprt, desc, req);
1154
1155 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1156 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1157
1158 spin_unlock(&xprt->transport_lock);
1159 return 0;
1160 }
1161
1162 #if defined(CONFIG_NFS_V4_1)
1163 /*
1164 * Obtains an rpc_rqst previously allocated and invokes the common
1165 * tcp read code to read the data. The result is placed in the callback
1166 * queue.
1167 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1168 * connection and return -1.
1169 */
1170 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1171 struct xdr_skb_reader *desc)
1172 {
1173 struct sock_xprt *transport =
1174 container_of(xprt, struct sock_xprt, xprt);
1175 struct rpc_rqst *req;
1176
1177 req = xprt_alloc_bc_request(xprt);
1178 if (req == NULL) {
1179 printk(KERN_WARNING "Callback slot table overflowed\n");
1180 xprt_force_disconnect(xprt);
1181 return -1;
1182 }
1183
1184 req->rq_xid = transport->tcp_xid;
1185 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1186 xs_tcp_read_common(xprt, desc, req);
1187
1188 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1189 struct svc_serv *bc_serv = xprt->bc_serv;
1190
1191 /*
1192 * Add callback request to callback list. The callback
1193 * service sleeps on the sv_cb_waitq waiting for new
1194 * requests. Wake it up after adding enqueing the
1195 * request.
1196 */
1197 dprintk("RPC: add callback request to list\n");
1198 spin_lock(&bc_serv->sv_cb_lock);
1199 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1200 spin_unlock(&bc_serv->sv_cb_lock);
1201 wake_up(&bc_serv->sv_cb_waitq);
1202 }
1203
1204 req->rq_private_buf.len = transport->tcp_copied;
1205
1206 return 0;
1207 }
1208
1209 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1210 struct xdr_skb_reader *desc)
1211 {
1212 struct sock_xprt *transport =
1213 container_of(xprt, struct sock_xprt, xprt);
1214
1215 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1216 xs_tcp_read_reply(xprt, desc) :
1217 xs_tcp_read_callback(xprt, desc);
1218 }
1219 #else
1220 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1221 struct xdr_skb_reader *desc)
1222 {
1223 return xs_tcp_read_reply(xprt, desc);
1224 }
1225 #endif /* CONFIG_NFS_V4_1 */
1226
1227 /*
1228 * Read data off the transport. This can be either an RPC_CALL or an
1229 * RPC_REPLY. Relay the processing to helper functions.
1230 */
1231 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1232 struct xdr_skb_reader *desc)
1233 {
1234 struct sock_xprt *transport =
1235 container_of(xprt, struct sock_xprt, xprt);
1236
1237 if (_xs_tcp_read_data(xprt, desc) == 0)
1238 xs_tcp_check_fraghdr(transport);
1239 else {
1240 /*
1241 * The transport_lock protects the request handling.
1242 * There's no need to hold it to update the tcp_flags.
1243 */
1244 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1245 }
1246 }
1247
1248 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1249 {
1250 size_t len;
1251
1252 len = transport->tcp_reclen - transport->tcp_offset;
1253 if (len > desc->count)
1254 len = desc->count;
1255 desc->count -= len;
1256 desc->offset += len;
1257 transport->tcp_offset += len;
1258 dprintk("RPC: discarded %Zu bytes\n", len);
1259 xs_tcp_check_fraghdr(transport);
1260 }
1261
1262 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1263 {
1264 struct rpc_xprt *xprt = rd_desc->arg.data;
1265 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1266 struct xdr_skb_reader desc = {
1267 .skb = skb,
1268 .offset = offset,
1269 .count = len,
1270 };
1271
1272 dprintk("RPC: xs_tcp_data_recv started\n");
1273 do {
1274 /* Read in a new fragment marker if necessary */
1275 /* Can we ever really expect to get completely empty fragments? */
1276 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1277 xs_tcp_read_fraghdr(xprt, &desc);
1278 continue;
1279 }
1280 /* Read in the xid if necessary */
1281 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1282 xs_tcp_read_xid(transport, &desc);
1283 continue;
1284 }
1285 /* Read in the call/reply flag */
1286 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1287 xs_tcp_read_calldir(transport, &desc);
1288 continue;
1289 }
1290 /* Read in the request data */
1291 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1292 xs_tcp_read_data(xprt, &desc);
1293 continue;
1294 }
1295 /* Skip over any trailing bytes on short reads */
1296 xs_tcp_read_discard(transport, &desc);
1297 } while (desc.count);
1298 dprintk("RPC: xs_tcp_data_recv done\n");
1299 return len - desc.count;
1300 }
1301
1302 /**
1303 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1304 * @sk: socket with data to read
1305 * @bytes: how much data to read
1306 *
1307 */
1308 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1309 {
1310 struct rpc_xprt *xprt;
1311 read_descriptor_t rd_desc;
1312 int read;
1313
1314 dprintk("RPC: xs_tcp_data_ready...\n");
1315
1316 read_lock(&sk->sk_callback_lock);
1317 if (!(xprt = xprt_from_sock(sk)))
1318 goto out;
1319 if (xprt->shutdown)
1320 goto out;
1321
1322 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1323 rd_desc.arg.data = xprt;
1324 do {
1325 rd_desc.count = 65536;
1326 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1327 } while (read > 0);
1328 out:
1329 read_unlock(&sk->sk_callback_lock);
1330 }
1331
1332 /*
1333 * Do the equivalent of linger/linger2 handling for dealing with
1334 * broken servers that don't close the socket in a timely
1335 * fashion
1336 */
1337 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1338 unsigned long timeout)
1339 {
1340 struct sock_xprt *transport;
1341
1342 if (xprt_test_and_set_connecting(xprt))
1343 return;
1344 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1345 transport = container_of(xprt, struct sock_xprt, xprt);
1346 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1347 timeout);
1348 }
1349
1350 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1351 {
1352 struct sock_xprt *transport;
1353
1354 transport = container_of(xprt, struct sock_xprt, xprt);
1355
1356 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1357 !cancel_delayed_work(&transport->connect_worker))
1358 return;
1359 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1360 xprt_clear_connecting(xprt);
1361 }
1362
1363 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1364 {
1365 smp_mb__before_clear_bit();
1366 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1367 clear_bit(XPRT_CLOSING, &xprt->state);
1368 smp_mb__after_clear_bit();
1369 /* Mark transport as closed and wake up all pending tasks */
1370 xprt_disconnect_done(xprt);
1371 }
1372
1373 /**
1374 * xs_tcp_state_change - callback to handle TCP socket state changes
1375 * @sk: socket whose state has changed
1376 *
1377 */
1378 static void xs_tcp_state_change(struct sock *sk)
1379 {
1380 struct rpc_xprt *xprt;
1381
1382 read_lock(&sk->sk_callback_lock);
1383 if (!(xprt = xprt_from_sock(sk)))
1384 goto out;
1385 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1386 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1387 sk->sk_state, xprt_connected(xprt),
1388 sock_flag(sk, SOCK_DEAD),
1389 sock_flag(sk, SOCK_ZAPPED));
1390
1391 switch (sk->sk_state) {
1392 case TCP_ESTABLISHED:
1393 spin_lock_bh(&xprt->transport_lock);
1394 if (!xprt_test_and_set_connected(xprt)) {
1395 struct sock_xprt *transport = container_of(xprt,
1396 struct sock_xprt, xprt);
1397
1398 /* Reset TCP record info */
1399 transport->tcp_offset = 0;
1400 transport->tcp_reclen = 0;
1401 transport->tcp_copied = 0;
1402 transport->tcp_flags =
1403 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1404
1405 xprt_wake_pending_tasks(xprt, -EAGAIN);
1406 }
1407 spin_unlock_bh(&xprt->transport_lock);
1408 break;
1409 case TCP_FIN_WAIT1:
1410 /* The client initiated a shutdown of the socket */
1411 xprt->connect_cookie++;
1412 xprt->reestablish_timeout = 0;
1413 set_bit(XPRT_CLOSING, &xprt->state);
1414 smp_mb__before_clear_bit();
1415 clear_bit(XPRT_CONNECTED, &xprt->state);
1416 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1417 smp_mb__after_clear_bit();
1418 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1419 break;
1420 case TCP_CLOSE_WAIT:
1421 /* The server initiated a shutdown of the socket */
1422 xprt_force_disconnect(xprt);
1423 case TCP_SYN_SENT:
1424 xprt->connect_cookie++;
1425 case TCP_CLOSING:
1426 /*
1427 * If the server closed down the connection, make sure that
1428 * we back off before reconnecting
1429 */
1430 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1431 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1432 break;
1433 case TCP_LAST_ACK:
1434 set_bit(XPRT_CLOSING, &xprt->state);
1435 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1436 smp_mb__before_clear_bit();
1437 clear_bit(XPRT_CONNECTED, &xprt->state);
1438 smp_mb__after_clear_bit();
1439 break;
1440 case TCP_CLOSE:
1441 xs_tcp_cancel_linger_timeout(xprt);
1442 xs_sock_mark_closed(xprt);
1443 }
1444 out:
1445 read_unlock(&sk->sk_callback_lock);
1446 }
1447
1448 /**
1449 * xs_error_report - callback mainly for catching socket errors
1450 * @sk: socket
1451 */
1452 static void xs_error_report(struct sock *sk)
1453 {
1454 struct rpc_xprt *xprt;
1455
1456 read_lock(&sk->sk_callback_lock);
1457 if (!(xprt = xprt_from_sock(sk)))
1458 goto out;
1459 dprintk("RPC: %s client %p...\n"
1460 "RPC: error %d\n",
1461 __func__, xprt, sk->sk_err);
1462 xprt_wake_pending_tasks(xprt, -EAGAIN);
1463 out:
1464 read_unlock(&sk->sk_callback_lock);
1465 }
1466
1467 static void xs_write_space(struct sock *sk)
1468 {
1469 struct socket *sock;
1470 struct rpc_xprt *xprt;
1471
1472 if (unlikely(!(sock = sk->sk_socket)))
1473 return;
1474 clear_bit(SOCK_NOSPACE, &sock->flags);
1475
1476 if (unlikely(!(xprt = xprt_from_sock(sk))))
1477 return;
1478 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1479 return;
1480
1481 xprt_write_space(xprt);
1482 }
1483
1484 /**
1485 * xs_udp_write_space - callback invoked when socket buffer space
1486 * becomes available
1487 * @sk: socket whose state has changed
1488 *
1489 * Called when more output buffer space is available for this socket.
1490 * We try not to wake our writers until they can make "significant"
1491 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1492 * with a bunch of small requests.
1493 */
1494 static void xs_udp_write_space(struct sock *sk)
1495 {
1496 read_lock(&sk->sk_callback_lock);
1497
1498 /* from net/core/sock.c:sock_def_write_space */
1499 if (sock_writeable(sk))
1500 xs_write_space(sk);
1501
1502 read_unlock(&sk->sk_callback_lock);
1503 }
1504
1505 /**
1506 * xs_tcp_write_space - callback invoked when socket buffer space
1507 * becomes available
1508 * @sk: socket whose state has changed
1509 *
1510 * Called when more output buffer space is available for this socket.
1511 * We try not to wake our writers until they can make "significant"
1512 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1513 * with a bunch of small requests.
1514 */
1515 static void xs_tcp_write_space(struct sock *sk)
1516 {
1517 read_lock(&sk->sk_callback_lock);
1518
1519 /* from net/core/stream.c:sk_stream_write_space */
1520 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1521 xs_write_space(sk);
1522
1523 read_unlock(&sk->sk_callback_lock);
1524 }
1525
1526 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1527 {
1528 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1529 struct sock *sk = transport->inet;
1530
1531 if (transport->rcvsize) {
1532 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1533 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1534 }
1535 if (transport->sndsize) {
1536 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1537 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1538 sk->sk_write_space(sk);
1539 }
1540 }
1541
1542 /**
1543 * xs_udp_set_buffer_size - set send and receive limits
1544 * @xprt: generic transport
1545 * @sndsize: requested size of send buffer, in bytes
1546 * @rcvsize: requested size of receive buffer, in bytes
1547 *
1548 * Set socket send and receive buffer size limits.
1549 */
1550 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1551 {
1552 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1553
1554 transport->sndsize = 0;
1555 if (sndsize)
1556 transport->sndsize = sndsize + 1024;
1557 transport->rcvsize = 0;
1558 if (rcvsize)
1559 transport->rcvsize = rcvsize + 1024;
1560
1561 xs_udp_do_set_buffer_size(xprt);
1562 }
1563
1564 /**
1565 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1566 * @task: task that timed out
1567 *
1568 * Adjust the congestion window after a retransmit timeout has occurred.
1569 */
1570 static void xs_udp_timer(struct rpc_task *task)
1571 {
1572 xprt_adjust_cwnd(task, -ETIMEDOUT);
1573 }
1574
1575 static unsigned short xs_get_random_port(void)
1576 {
1577 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1578 unsigned short rand = (unsigned short) net_random() % range;
1579 return rand + xprt_min_resvport;
1580 }
1581
1582 /**
1583 * xs_set_port - reset the port number in the remote endpoint address
1584 * @xprt: generic transport
1585 * @port: new port number
1586 *
1587 */
1588 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1589 {
1590 struct sockaddr *addr = xs_addr(xprt);
1591
1592 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1593
1594 switch (addr->sa_family) {
1595 case AF_INET:
1596 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1597 break;
1598 case AF_INET6:
1599 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1600 break;
1601 default:
1602 BUG();
1603 }
1604 }
1605
1606 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1607 {
1608 unsigned short port = transport->port;
1609
1610 if (port == 0 && transport->xprt.resvport)
1611 port = xs_get_random_port();
1612 return port;
1613 }
1614
1615 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1616 {
1617 if (transport->port != 0)
1618 transport->port = 0;
1619 if (!transport->xprt.resvport)
1620 return 0;
1621 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1622 return xprt_max_resvport;
1623 return --port;
1624 }
1625
1626 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1627 {
1628 struct sockaddr_in myaddr = {
1629 .sin_family = AF_INET,
1630 };
1631 struct sockaddr_in *sa;
1632 int err, nloop = 0;
1633 unsigned short port = xs_get_srcport(transport, sock);
1634 unsigned short last;
1635
1636 sa = (struct sockaddr_in *)&transport->addr;
1637 myaddr.sin_addr = sa->sin_addr;
1638 do {
1639 myaddr.sin_port = htons(port);
1640 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1641 sizeof(myaddr));
1642 if (port == 0)
1643 break;
1644 if (err == 0) {
1645 transport->port = port;
1646 break;
1647 }
1648 last = port;
1649 port = xs_next_srcport(transport, sock, port);
1650 if (port > last)
1651 nloop++;
1652 } while (err == -EADDRINUSE && nloop != 2);
1653 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1654 __func__, &myaddr.sin_addr,
1655 port, err ? "failed" : "ok", err);
1656 return err;
1657 }
1658
1659 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1660 {
1661 struct sockaddr_in6 myaddr = {
1662 .sin6_family = AF_INET6,
1663 };
1664 struct sockaddr_in6 *sa;
1665 int err, nloop = 0;
1666 unsigned short port = xs_get_srcport(transport, sock);
1667 unsigned short last;
1668
1669 sa = (struct sockaddr_in6 *)&transport->addr;
1670 myaddr.sin6_addr = sa->sin6_addr;
1671 do {
1672 myaddr.sin6_port = htons(port);
1673 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1674 sizeof(myaddr));
1675 if (port == 0)
1676 break;
1677 if (err == 0) {
1678 transport->port = port;
1679 break;
1680 }
1681 last = port;
1682 port = xs_next_srcport(transport, sock, port);
1683 if (port > last)
1684 nloop++;
1685 } while (err == -EADDRINUSE && nloop != 2);
1686 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1687 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1688 return err;
1689 }
1690
1691 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1692 static struct lock_class_key xs_key[2];
1693 static struct lock_class_key xs_slock_key[2];
1694
1695 static inline void xs_reclassify_socket4(struct socket *sock)
1696 {
1697 struct sock *sk = sock->sk;
1698
1699 BUG_ON(sock_owned_by_user(sk));
1700 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1701 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1702 }
1703
1704 static inline void xs_reclassify_socket6(struct socket *sock)
1705 {
1706 struct sock *sk = sock->sk;
1707
1708 BUG_ON(sock_owned_by_user(sk));
1709 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1710 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1711 }
1712 #else
1713 static inline void xs_reclassify_socket4(struct socket *sock)
1714 {
1715 }
1716
1717 static inline void xs_reclassify_socket6(struct socket *sock)
1718 {
1719 }
1720 #endif
1721
1722 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1723 {
1724 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1725
1726 if (!transport->inet) {
1727 struct sock *sk = sock->sk;
1728
1729 write_lock_bh(&sk->sk_callback_lock);
1730
1731 xs_save_old_callbacks(transport, sk);
1732
1733 sk->sk_user_data = xprt;
1734 sk->sk_data_ready = xs_udp_data_ready;
1735 sk->sk_write_space = xs_udp_write_space;
1736 sk->sk_error_report = xs_error_report;
1737 sk->sk_no_check = UDP_CSUM_NORCV;
1738 sk->sk_allocation = GFP_ATOMIC;
1739
1740 xprt_set_connected(xprt);
1741
1742 /* Reset to new socket */
1743 transport->sock = sock;
1744 transport->inet = sk;
1745
1746 write_unlock_bh(&sk->sk_callback_lock);
1747 }
1748 xs_udp_do_set_buffer_size(xprt);
1749 }
1750
1751 /**
1752 * xs_udp_connect_worker4 - set up a UDP socket
1753 * @work: RPC transport to connect
1754 *
1755 * Invoked by a work queue tasklet.
1756 */
1757 static void xs_udp_connect_worker4(struct work_struct *work)
1758 {
1759 struct sock_xprt *transport =
1760 container_of(work, struct sock_xprt, connect_worker.work);
1761 struct rpc_xprt *xprt = &transport->xprt;
1762 struct socket *sock = transport->sock;
1763 int err, status = -EIO;
1764
1765 if (xprt->shutdown)
1766 goto out;
1767
1768 /* Start by resetting any existing state */
1769 xs_reset_transport(transport);
1770
1771 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1772 if (err < 0) {
1773 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1774 goto out;
1775 }
1776 xs_reclassify_socket4(sock);
1777
1778 if (xs_bind4(transport, sock)) {
1779 sock_release(sock);
1780 goto out;
1781 }
1782
1783 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1784 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1785
1786 xs_udp_finish_connecting(xprt, sock);
1787 status = 0;
1788 out:
1789 xprt_clear_connecting(xprt);
1790 xprt_wake_pending_tasks(xprt, status);
1791 }
1792
1793 /**
1794 * xs_udp_connect_worker6 - set up a UDP socket
1795 * @work: RPC transport to connect
1796 *
1797 * Invoked by a work queue tasklet.
1798 */
1799 static void xs_udp_connect_worker6(struct work_struct *work)
1800 {
1801 struct sock_xprt *transport =
1802 container_of(work, struct sock_xprt, connect_worker.work);
1803 struct rpc_xprt *xprt = &transport->xprt;
1804 struct socket *sock = transport->sock;
1805 int err, status = -EIO;
1806
1807 if (xprt->shutdown)
1808 goto out;
1809
1810 /* Start by resetting any existing state */
1811 xs_reset_transport(transport);
1812
1813 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1814 if (err < 0) {
1815 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1816 goto out;
1817 }
1818 xs_reclassify_socket6(sock);
1819
1820 if (xs_bind6(transport, sock) < 0) {
1821 sock_release(sock);
1822 goto out;
1823 }
1824
1825 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1826 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1827
1828 xs_udp_finish_connecting(xprt, sock);
1829 status = 0;
1830 out:
1831 xprt_clear_connecting(xprt);
1832 xprt_wake_pending_tasks(xprt, status);
1833 }
1834
1835 /*
1836 * We need to preserve the port number so the reply cache on the server can
1837 * find our cached RPC replies when we get around to reconnecting.
1838 */
1839 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1840 {
1841 int result;
1842 struct sockaddr any;
1843
1844 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1845
1846 /*
1847 * Disconnect the transport socket by doing a connect operation
1848 * with AF_UNSPEC. This should return immediately...
1849 */
1850 memset(&any, 0, sizeof(any));
1851 any.sa_family = AF_UNSPEC;
1852 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1853 if (!result)
1854 xs_sock_mark_closed(xprt);
1855 else
1856 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1857 result);
1858 }
1859
1860 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1861 {
1862 unsigned int state = transport->inet->sk_state;
1863
1864 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1865 return;
1866 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1867 return;
1868 xs_abort_connection(xprt, transport);
1869 }
1870
1871 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1872 {
1873 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1874
1875 if (!transport->inet) {
1876 struct sock *sk = sock->sk;
1877
1878 write_lock_bh(&sk->sk_callback_lock);
1879
1880 xs_save_old_callbacks(transport, sk);
1881
1882 sk->sk_user_data = xprt;
1883 sk->sk_data_ready = xs_tcp_data_ready;
1884 sk->sk_state_change = xs_tcp_state_change;
1885 sk->sk_write_space = xs_tcp_write_space;
1886 sk->sk_error_report = xs_error_report;
1887 sk->sk_allocation = GFP_ATOMIC;
1888
1889 /* socket options */
1890 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1891 sock_reset_flag(sk, SOCK_LINGER);
1892 tcp_sk(sk)->linger2 = 0;
1893 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1894
1895 xprt_clear_connected(xprt);
1896
1897 /* Reset to new socket */
1898 transport->sock = sock;
1899 transport->inet = sk;
1900
1901 write_unlock_bh(&sk->sk_callback_lock);
1902 }
1903
1904 if (!xprt_bound(xprt))
1905 return -ENOTCONN;
1906
1907 /* Tell the socket layer to start connecting... */
1908 xprt->stat.connect_count++;
1909 xprt->stat.connect_start = jiffies;
1910 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1911 }
1912
1913 /**
1914 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1915 * @xprt: RPC transport to connect
1916 * @transport: socket transport to connect
1917 * @create_sock: function to create a socket of the correct type
1918 *
1919 * Invoked by a work queue tasklet.
1920 */
1921 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1922 struct sock_xprt *transport,
1923 struct socket *(*create_sock)(struct rpc_xprt *,
1924 struct sock_xprt *))
1925 {
1926 struct socket *sock = transport->sock;
1927 int status = -EIO;
1928
1929 if (xprt->shutdown)
1930 goto out;
1931
1932 if (!sock) {
1933 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1934 sock = create_sock(xprt, transport);
1935 if (IS_ERR(sock)) {
1936 status = PTR_ERR(sock);
1937 goto out;
1938 }
1939 } else {
1940 int abort_and_exit;
1941
1942 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1943 &xprt->state);
1944 /* "close" the socket, preserving the local port */
1945 xs_tcp_reuse_connection(xprt, transport);
1946
1947 if (abort_and_exit)
1948 goto out_eagain;
1949 }
1950
1951 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1952 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1953
1954 status = xs_tcp_finish_connecting(xprt, sock);
1955 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1956 xprt, -status, xprt_connected(xprt),
1957 sock->sk->sk_state);
1958 switch (status) {
1959 default:
1960 printk("%s: connect returned unhandled error %d\n",
1961 __func__, status);
1962 case -EADDRNOTAVAIL:
1963 /* We're probably in TIME_WAIT. Get rid of existing socket,
1964 * and retry
1965 */
1966 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1967 xprt_force_disconnect(xprt);
1968 break;
1969 case -ECONNREFUSED:
1970 case -ECONNRESET:
1971 case -ENETUNREACH:
1972 /* retry with existing socket, after a delay */
1973 case 0:
1974 case -EINPROGRESS:
1975 case -EALREADY:
1976 xprt_clear_connecting(xprt);
1977 return;
1978 }
1979 out_eagain:
1980 status = -EAGAIN;
1981 out:
1982 xprt_clear_connecting(xprt);
1983 xprt_wake_pending_tasks(xprt, status);
1984 }
1985
1986 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1987 struct sock_xprt *transport)
1988 {
1989 struct socket *sock;
1990 int err;
1991
1992 /* start from scratch */
1993 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1994 if (err < 0) {
1995 dprintk("RPC: can't create TCP transport socket (%d).\n",
1996 -err);
1997 goto out_err;
1998 }
1999 xs_reclassify_socket4(sock);
2000
2001 if (xs_bind4(transport, sock) < 0) {
2002 sock_release(sock);
2003 goto out_err;
2004 }
2005 return sock;
2006 out_err:
2007 return ERR_PTR(-EIO);
2008 }
2009
2010 /**
2011 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
2012 * @work: RPC transport to connect
2013 *
2014 * Invoked by a work queue tasklet.
2015 */
2016 static void xs_tcp_connect_worker4(struct work_struct *work)
2017 {
2018 struct sock_xprt *transport =
2019 container_of(work, struct sock_xprt, connect_worker.work);
2020 struct rpc_xprt *xprt = &transport->xprt;
2021
2022 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
2023 }
2024
2025 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
2026 struct sock_xprt *transport)
2027 {
2028 struct socket *sock;
2029 int err;
2030
2031 /* start from scratch */
2032 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
2033 if (err < 0) {
2034 dprintk("RPC: can't create TCP transport socket (%d).\n",
2035 -err);
2036 goto out_err;
2037 }
2038 xs_reclassify_socket6(sock);
2039
2040 if (xs_bind6(transport, sock) < 0) {
2041 sock_release(sock);
2042 goto out_err;
2043 }
2044 return sock;
2045 out_err:
2046 return ERR_PTR(-EIO);
2047 }
2048
2049 /**
2050 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
2051 * @work: RPC transport to connect
2052 *
2053 * Invoked by a work queue tasklet.
2054 */
2055 static void xs_tcp_connect_worker6(struct work_struct *work)
2056 {
2057 struct sock_xprt *transport =
2058 container_of(work, struct sock_xprt, connect_worker.work);
2059 struct rpc_xprt *xprt = &transport->xprt;
2060
2061 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
2062 }
2063
2064 /**
2065 * xs_connect - connect a socket to a remote endpoint
2066 * @task: address of RPC task that manages state of connect request
2067 *
2068 * TCP: If the remote end dropped the connection, delay reconnecting.
2069 *
2070 * UDP socket connects are synchronous, but we use a work queue anyway
2071 * to guarantee that even unprivileged user processes can set up a
2072 * socket on a privileged port.
2073 *
2074 * If a UDP socket connect fails, the delay behavior here prevents
2075 * retry floods (hard mounts).
2076 */
2077 static void xs_connect(struct rpc_task *task)
2078 {
2079 struct rpc_xprt *xprt = task->tk_xprt;
2080 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2081
2082 if (xprt_test_and_set_connecting(xprt))
2083 return;
2084
2085 if (transport->sock != NULL) {
2086 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2087 "seconds\n",
2088 xprt, xprt->reestablish_timeout / HZ);
2089 queue_delayed_work(rpciod_workqueue,
2090 &transport->connect_worker,
2091 xprt->reestablish_timeout);
2092 xprt->reestablish_timeout <<= 1;
2093 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2094 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2095 } else {
2096 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2097 queue_delayed_work(rpciod_workqueue,
2098 &transport->connect_worker, 0);
2099 }
2100 }
2101
2102 static void xs_tcp_connect(struct rpc_task *task)
2103 {
2104 struct rpc_xprt *xprt = task->tk_xprt;
2105
2106 /* Exit if we need to wait for socket shutdown to complete */
2107 if (test_bit(XPRT_CLOSING, &xprt->state))
2108 return;
2109 xs_connect(task);
2110 }
2111
2112 /**
2113 * xs_udp_print_stats - display UDP socket-specifc stats
2114 * @xprt: rpc_xprt struct containing statistics
2115 * @seq: output file
2116 *
2117 */
2118 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2119 {
2120 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2121
2122 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2123 transport->port,
2124 xprt->stat.bind_count,
2125 xprt->stat.sends,
2126 xprt->stat.recvs,
2127 xprt->stat.bad_xids,
2128 xprt->stat.req_u,
2129 xprt->stat.bklog_u);
2130 }
2131
2132 /**
2133 * xs_tcp_print_stats - display TCP socket-specifc stats
2134 * @xprt: rpc_xprt struct containing statistics
2135 * @seq: output file
2136 *
2137 */
2138 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2139 {
2140 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2141 long idle_time = 0;
2142
2143 if (xprt_connected(xprt))
2144 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2145
2146 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2147 transport->port,
2148 xprt->stat.bind_count,
2149 xprt->stat.connect_count,
2150 xprt->stat.connect_time,
2151 idle_time,
2152 xprt->stat.sends,
2153 xprt->stat.recvs,
2154 xprt->stat.bad_xids,
2155 xprt->stat.req_u,
2156 xprt->stat.bklog_u);
2157 }
2158
2159 static struct rpc_xprt_ops xs_udp_ops = {
2160 .set_buffer_size = xs_udp_set_buffer_size,
2161 .reserve_xprt = xprt_reserve_xprt_cong,
2162 .release_xprt = xprt_release_xprt_cong,
2163 .rpcbind = rpcb_getport_async,
2164 .set_port = xs_set_port,
2165 .connect = xs_connect,
2166 .buf_alloc = rpc_malloc,
2167 .buf_free = rpc_free,
2168 .send_request = xs_udp_send_request,
2169 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2170 .timer = xs_udp_timer,
2171 .release_request = xprt_release_rqst_cong,
2172 .close = xs_close,
2173 .destroy = xs_destroy,
2174 .print_stats = xs_udp_print_stats,
2175 };
2176
2177 static struct rpc_xprt_ops xs_tcp_ops = {
2178 .reserve_xprt = xprt_reserve_xprt,
2179 .release_xprt = xs_tcp_release_xprt,
2180 .rpcbind = rpcb_getport_async,
2181 .set_port = xs_set_port,
2182 .connect = xs_tcp_connect,
2183 .buf_alloc = rpc_malloc,
2184 .buf_free = rpc_free,
2185 .send_request = xs_tcp_send_request,
2186 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2187 #if defined(CONFIG_NFS_V4_1)
2188 .release_request = bc_release_request,
2189 #endif /* CONFIG_NFS_V4_1 */
2190 .close = xs_tcp_close,
2191 .destroy = xs_destroy,
2192 .print_stats = xs_tcp_print_stats,
2193 };
2194
2195 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2196 unsigned int slot_table_size)
2197 {
2198 struct rpc_xprt *xprt;
2199 struct sock_xprt *new;
2200
2201 if (args->addrlen > sizeof(xprt->addr)) {
2202 dprintk("RPC: xs_setup_xprt: address too large\n");
2203 return ERR_PTR(-EBADF);
2204 }
2205
2206 new = kzalloc(sizeof(*new), GFP_KERNEL);
2207 if (new == NULL) {
2208 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2209 "rpc_xprt\n");
2210 return ERR_PTR(-ENOMEM);
2211 }
2212 xprt = &new->xprt;
2213
2214 xprt->max_reqs = slot_table_size;
2215 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2216 if (xprt->slot == NULL) {
2217 kfree(xprt);
2218 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2219 "table\n");
2220 return ERR_PTR(-ENOMEM);
2221 }
2222
2223 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2224 xprt->addrlen = args->addrlen;
2225 if (args->srcaddr)
2226 memcpy(&new->addr, args->srcaddr, args->addrlen);
2227
2228 return xprt;
2229 }
2230
2231 static const struct rpc_timeout xs_udp_default_timeout = {
2232 .to_initval = 5 * HZ,
2233 .to_maxval = 30 * HZ,
2234 .to_increment = 5 * HZ,
2235 .to_retries = 5,
2236 };
2237
2238 /**
2239 * xs_setup_udp - Set up transport to use a UDP socket
2240 * @args: rpc transport creation arguments
2241 *
2242 */
2243 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2244 {
2245 struct sockaddr *addr = args->dstaddr;
2246 struct rpc_xprt *xprt;
2247 struct sock_xprt *transport;
2248
2249 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2250 if (IS_ERR(xprt))
2251 return xprt;
2252 transport = container_of(xprt, struct sock_xprt, xprt);
2253
2254 xprt->prot = IPPROTO_UDP;
2255 xprt->tsh_size = 0;
2256 /* XXX: header size can vary due to auth type, IPv6, etc. */
2257 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2258
2259 xprt->bind_timeout = XS_BIND_TO;
2260 xprt->connect_timeout = XS_UDP_CONN_TO;
2261 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2262 xprt->idle_timeout = XS_IDLE_DISC_TO;
2263
2264 xprt->ops = &xs_udp_ops;
2265
2266 xprt->timeout = &xs_udp_default_timeout;
2267
2268 switch (addr->sa_family) {
2269 case AF_INET:
2270 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2271 xprt_set_bound(xprt);
2272
2273 INIT_DELAYED_WORK(&transport->connect_worker,
2274 xs_udp_connect_worker4);
2275 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2276 break;
2277 case AF_INET6:
2278 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2279 xprt_set_bound(xprt);
2280
2281 INIT_DELAYED_WORK(&transport->connect_worker,
2282 xs_udp_connect_worker6);
2283 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2284 break;
2285 default:
2286 kfree(xprt);
2287 return ERR_PTR(-EAFNOSUPPORT);
2288 }
2289
2290 dprintk("RPC: set up transport to address %s\n",
2291 xprt->address_strings[RPC_DISPLAY_ALL]);
2292
2293 if (try_module_get(THIS_MODULE))
2294 return xprt;
2295
2296 kfree(xprt->slot);
2297 kfree(xprt);
2298 return ERR_PTR(-EINVAL);
2299 }
2300
2301 static const struct rpc_timeout xs_tcp_default_timeout = {
2302 .to_initval = 60 * HZ,
2303 .to_maxval = 60 * HZ,
2304 .to_retries = 2,
2305 };
2306
2307 /**
2308 * xs_setup_tcp - Set up transport to use a TCP socket
2309 * @args: rpc transport creation arguments
2310 *
2311 */
2312 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2313 {
2314 struct sockaddr *addr = args->dstaddr;
2315 struct rpc_xprt *xprt;
2316 struct sock_xprt *transport;
2317
2318 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2319 if (IS_ERR(xprt))
2320 return xprt;
2321 transport = container_of(xprt, struct sock_xprt, xprt);
2322
2323 xprt->prot = IPPROTO_TCP;
2324 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2325 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2326
2327 xprt->bind_timeout = XS_BIND_TO;
2328 xprt->connect_timeout = XS_TCP_CONN_TO;
2329 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2330 xprt->idle_timeout = XS_IDLE_DISC_TO;
2331
2332 xprt->ops = &xs_tcp_ops;
2333 xprt->timeout = &xs_tcp_default_timeout;
2334
2335 switch (addr->sa_family) {
2336 case AF_INET:
2337 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2338 xprt_set_bound(xprt);
2339
2340 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2341 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2342 break;
2343 case AF_INET6:
2344 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2345 xprt_set_bound(xprt);
2346
2347 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2348 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2349 break;
2350 default:
2351 kfree(xprt);
2352 return ERR_PTR(-EAFNOSUPPORT);
2353 }
2354
2355 dprintk("RPC: set up transport to address %s\n",
2356 xprt->address_strings[RPC_DISPLAY_ALL]);
2357
2358 if (try_module_get(THIS_MODULE))
2359 return xprt;
2360
2361 kfree(xprt->slot);
2362 kfree(xprt);
2363 return ERR_PTR(-EINVAL);
2364 }
2365
2366 static struct xprt_class xs_udp_transport = {
2367 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2368 .name = "udp",
2369 .owner = THIS_MODULE,
2370 .ident = IPPROTO_UDP,
2371 .setup = xs_setup_udp,
2372 };
2373
2374 static struct xprt_class xs_tcp_transport = {
2375 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2376 .name = "tcp",
2377 .owner = THIS_MODULE,
2378 .ident = IPPROTO_TCP,
2379 .setup = xs_setup_tcp,
2380 };
2381
2382 /**
2383 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2384 *
2385 */
2386 int init_socket_xprt(void)
2387 {
2388 #ifdef RPC_DEBUG
2389 if (!sunrpc_table_header)
2390 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2391 #endif
2392
2393 xprt_register_transport(&xs_udp_transport);
2394 xprt_register_transport(&xs_tcp_transport);
2395
2396 return 0;
2397 }
2398
2399 /**
2400 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2401 *
2402 */
2403 void cleanup_socket_xprt(void)
2404 {
2405 #ifdef RPC_DEBUG
2406 if (sunrpc_table_header) {
2407 unregister_sysctl_table(sunrpc_table_header);
2408 sunrpc_table_header = NULL;
2409 }
2410 #endif
2411
2412 xprt_unregister_transport(&xs_udp_transport);
2413 xprt_unregister_transport(&xs_tcp_transport);
2414 }
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