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ipv6: Pull IPv6 GSO registration out of the module
[linux/fpc-iii.git] / net / sunrpc / xprtsock.c
blob75853cabf4c97b153873eda4ce67cd228581fd15
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/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/net.h>
31 #include <linux/mm.h>
32 #include <linux/un.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/sched.h>
37 #include <linux/sunrpc/svcsock.h>
38 #include <linux/sunrpc/xprtsock.h>
39 #include <linux/file.h>
40 #ifdef CONFIG_SUNRPC_BACKCHANNEL
41 #include <linux/sunrpc/bc_xprt.h>
42 #endif
43
44 #include <net/sock.h>
45 #include <net/checksum.h>
46 #include <net/udp.h>
47 #include <net/tcp.h>
48
49 #include "sunrpc.h"
50
51 static void xs_close(struct rpc_xprt *xprt);
52
53 /*
54 * xprtsock tunables
55 */
56 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
57 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
58 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
59
60 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
61 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
62
63 #define XS_TCP_LINGER_TO (15U * HZ)
64 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
65
66 /*
67 * We can register our own files under /proc/sys/sunrpc by
68 * calling register_sysctl_table() again. The files in that
69 * directory become the union of all files registered there.
70 *
71 * We simply need to make sure that we don't collide with
72 * someone else's file names!
73 */
74
75 #ifdef RPC_DEBUG
76
77 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
78 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
79 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
80 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
81 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
82
83 static struct ctl_table_header *sunrpc_table_header;
84
85 /*
86 * FIXME: changing the UDP slot table size should also resize the UDP
87 * socket buffers for existing UDP transports
88 */
89 static ctl_table xs_tunables_table[] = {
90 {
91 .procname = "udp_slot_table_entries",
92 .data = &xprt_udp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
95 .proc_handler = proc_dointvec_minmax,
96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
100 .procname = "tcp_slot_table_entries",
101 .data = &xprt_tcp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
104 .proc_handler = proc_dointvec_minmax,
105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
109 .procname = "tcp_max_slot_table_entries",
110 .data = &xprt_max_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_tcp_slot_table_limit
116 },
117 {
118 .procname = "min_resvport",
119 .data = &xprt_min_resvport,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec_minmax,
123 .extra1 = &xprt_min_resvport_limit,
124 .extra2 = &xprt_max_resvport_limit
125 },
126 {
127 .procname = "max_resvport",
128 .data = &xprt_max_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_minmax,
132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
135 {
136 .procname = "tcp_fin_timeout",
137 .data = &xs_tcp_fin_timeout,
138 .maxlen = sizeof(xs_tcp_fin_timeout),
139 .mode = 0644,
140 .proc_handler = proc_dointvec_jiffies,
141 },
142 { },
143 };
144
145 static ctl_table sunrpc_table[] = {
146 {
147 .procname = "sunrpc",
148 .mode = 0555,
149 .child = xs_tunables_table
150 },
151 { },
152 };
153
154 #endif
155
156 /*
157 * Wait duration for a reply from the RPC portmapper.
158 */
159 #define XS_BIND_TO (60U * HZ)
160
161 /*
162 * Delay if a UDP socket connect error occurs. This is most likely some
163 * kind of resource problem on the local host.
164 */
165 #define XS_UDP_REEST_TO (2U * HZ)
166
167 /*
168 * The reestablish timeout allows clients to delay for a bit before attempting
169 * to reconnect to a server that just dropped our connection.
170 *
171 * We implement an exponential backoff when trying to reestablish a TCP
172 * transport connection with the server. Some servers like to drop a TCP
173 * connection when they are overworked, so we start with a short timeout and
174 * increase over time if the server is down or not responding.
175 */
176 #define XS_TCP_INIT_REEST_TO (3U * HZ)
177 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178
179 /*
180 * TCP idle timeout; client drops the transport socket if it is idle
181 * for this long. Note that we also timeout UDP sockets to prevent
182 * holding port numbers when there is no RPC traffic.
183 */
184 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
185
186 #ifdef RPC_DEBUG
187 # undef RPC_DEBUG_DATA
188 # define RPCDBG_FACILITY RPCDBG_TRANS
189 #endif
190
191 #ifdef RPC_DEBUG_DATA
192 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
193 {
194 u8 *buf = (u8 *) packet;
195 int j;
196
197 dprintk("RPC: %s\n", msg);
198 for (j = 0; j < count && j < 128; j += 4) {
199 if (!(j & 31)) {
200 if (j)
201 dprintk("\n");
202 dprintk("0x%04x ", j);
203 }
204 dprintk("%02x%02x%02x%02x ",
205 buf[j], buf[j+1], buf[j+2], buf[j+3]);
206 }
207 dprintk("\n");
208 }
209 #else
210 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
211 {
212 /* NOP */
213 }
214 #endif
215
216 struct sock_xprt {
217 struct rpc_xprt xprt;
218
219 /*
220 * Network layer
221 */
222 struct socket * sock;
223 struct sock * inet;
224
225 /*
226 * State of TCP reply receive
227 */
228 __be32 tcp_fraghdr,
229 tcp_xid,
230 tcp_calldir;
231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
237
238 /*
239 * Connection of transports
240 */
241 struct delayed_work connect_worker;
242 struct sockaddr_storage srcaddr;
243 unsigned short srcport;
244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
257 };
258
259 /*
260 * TCP receive state flags
261 */
262 #define TCP_RCV_LAST_FRAG (1UL << 0)
263 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
264 #define TCP_RCV_COPY_XID (1UL << 2)
265 #define TCP_RCV_COPY_DATA (1UL << 3)
266 #define TCP_RCV_READ_CALLDIR (1UL << 4)
267 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
268
269 /*
270 * TCP RPC flags
271 */
272 #define TCP_RPC_REPLY (1UL << 6)
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_un *xs_addr_un(struct rpc_xprt *xprt)
280 {
281 return (struct sockaddr_un *) &xprt->addr;
282 }
283
284 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
285 {
286 return (struct sockaddr_in *) &xprt->addr;
287 }
288
289 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
290 {
291 return (struct sockaddr_in6 *) &xprt->addr;
292 }
293
294 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
295 {
296 struct sockaddr *sap = xs_addr(xprt);
297 struct sockaddr_in6 *sin6;
298 struct sockaddr_in *sin;
299 struct sockaddr_un *sun;
300 char buf[128];
301
302 switch (sap->sa_family) {
303 case AF_LOCAL:
304 sun = xs_addr_un(xprt);
305 strlcpy(buf, sun->sun_path, sizeof(buf));
306 xprt->address_strings[RPC_DISPLAY_ADDR] =
307 kstrdup(buf, GFP_KERNEL);
308 break;
309 case AF_INET:
310 (void)rpc_ntop(sap, buf, sizeof(buf));
311 xprt->address_strings[RPC_DISPLAY_ADDR] =
312 kstrdup(buf, GFP_KERNEL);
313 sin = xs_addr_in(xprt);
314 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
315 break;
316 case AF_INET6:
317 (void)rpc_ntop(sap, buf, sizeof(buf));
318 xprt->address_strings[RPC_DISPLAY_ADDR] =
319 kstrdup(buf, GFP_KERNEL);
320 sin6 = xs_addr_in6(xprt);
321 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
322 break;
323 default:
324 BUG();
325 }
326
327 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
328 }
329
330 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
331 {
332 struct sockaddr *sap = xs_addr(xprt);
333 char buf[128];
334
335 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
336 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
337
338 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
339 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
340 }
341
342 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
343 const char *protocol,
344 const char *netid)
345 {
346 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
347 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
348 xs_format_common_peer_addresses(xprt);
349 xs_format_common_peer_ports(xprt);
350 }
351
352 static void xs_update_peer_port(struct rpc_xprt *xprt)
353 {
354 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
355 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
356
357 xs_format_common_peer_ports(xprt);
358 }
359
360 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
361 {
362 unsigned int i;
363
364 for (i = 0; i < RPC_DISPLAY_MAX; i++)
365 switch (i) {
366 case RPC_DISPLAY_PROTO:
367 case RPC_DISPLAY_NETID:
368 continue;
369 default:
370 kfree(xprt->address_strings[i]);
371 }
372 }
373
374 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
375
376 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
377 {
378 struct msghdr msg = {
379 .msg_name = addr,
380 .msg_namelen = addrlen,
381 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
382 };
383 struct kvec iov = {
384 .iov_base = vec->iov_base + base,
385 .iov_len = vec->iov_len - base,
386 };
387
388 if (iov.iov_len != 0)
389 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
390 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
391 }
392
393 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
394 {
395 struct page **ppage;
396 unsigned int remainder;
397 int err, sent = 0;
398
399 remainder = xdr->page_len - base;
400 base += xdr->page_base;
401 ppage = xdr->pages + (base >> PAGE_SHIFT);
402 base &= ~PAGE_MASK;
403 for(;;) {
404 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
405 int flags = XS_SENDMSG_FLAGS;
406
407 remainder -= len;
408 if (remainder != 0 || more)
409 flags |= MSG_MORE;
410 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
411 if (remainder == 0 || err != len)
412 break;
413 sent += err;
414 ppage++;
415 base = 0;
416 }
417 if (sent == 0)
418 return err;
419 if (err > 0)
420 sent += err;
421 return sent;
422 }
423
424 /**
425 * xs_sendpages - write pages directly to a socket
426 * @sock: socket to send on
427 * @addr: UDP only -- address of destination
428 * @addrlen: UDP only -- length of destination address
429 * @xdr: buffer containing this request
430 * @base: starting position in the buffer
431 *
432 */
433 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
434 {
435 unsigned int remainder = xdr->len - base;
436 int err, sent = 0;
437
438 if (unlikely(!sock))
439 return -ENOTSOCK;
440
441 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
442 if (base != 0) {
443 addr = NULL;
444 addrlen = 0;
445 }
446
447 if (base < xdr->head[0].iov_len || addr != NULL) {
448 unsigned int len = xdr->head[0].iov_len - base;
449 remainder -= len;
450 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
451 if (remainder == 0 || err != len)
452 goto out;
453 sent += err;
454 base = 0;
455 } else
456 base -= xdr->head[0].iov_len;
457
458 if (base < xdr->page_len) {
459 unsigned int len = xdr->page_len - base;
460 remainder -= len;
461 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
462 if (remainder == 0 || err != len)
463 goto out;
464 sent += err;
465 base = 0;
466 } else
467 base -= xdr->page_len;
468
469 if (base >= xdr->tail[0].iov_len)
470 return sent;
471 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
472 out:
473 if (sent == 0)
474 return err;
475 if (err > 0)
476 sent += err;
477 return sent;
478 }
479
480 static void xs_nospace_callback(struct rpc_task *task)
481 {
482 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
483
484 transport->inet->sk_write_pending--;
485 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
486 }
487
488 /**
489 * xs_nospace - place task on wait queue if transmit was incomplete
490 * @task: task to put to sleep
491 *
492 */
493 static int xs_nospace(struct rpc_task *task)
494 {
495 struct rpc_rqst *req = task->tk_rqstp;
496 struct rpc_xprt *xprt = req->rq_xprt;
497 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
498 int ret = -EAGAIN;
499
500 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
501 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
502 req->rq_slen);
503
504 /* Protect against races with write_space */
505 spin_lock_bh(&xprt->transport_lock);
506
507 /* Don't race with disconnect */
508 if (xprt_connected(xprt)) {
509 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
510 /*
511 * Notify TCP that we're limited by the application
512 * window size
513 */
514 set_bit(SOCK_NOSPACE, &transport->sock->flags);
515 transport->inet->sk_write_pending++;
516 /* ...and wait for more buffer space */
517 xprt_wait_for_buffer_space(task, xs_nospace_callback);
518 }
519 } else {
520 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
521 ret = -ENOTCONN;
522 }
523
524 spin_unlock_bh(&xprt->transport_lock);
525 return ret;
526 }
527
528 /*
529 * Construct a stream transport record marker in @buf.
530 */
531 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
532 {
533 u32 reclen = buf->len - sizeof(rpc_fraghdr);
534 rpc_fraghdr *base = buf->head[0].iov_base;
535 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
536 }
537
538 /**
539 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
540 * @task: RPC task that manages the state of an RPC request
541 *
542 * Return values:
543 * 0: The request has been sent
544 * EAGAIN: The socket was blocked, please call again later to
545 * complete the request
546 * ENOTCONN: Caller needs to invoke connect logic then call again
547 * other: Some other error occured, the request was not sent
548 */
549 static int xs_local_send_request(struct rpc_task *task)
550 {
551 struct rpc_rqst *req = task->tk_rqstp;
552 struct rpc_xprt *xprt = req->rq_xprt;
553 struct sock_xprt *transport =
554 container_of(xprt, struct sock_xprt, xprt);
555 struct xdr_buf *xdr = &req->rq_snd_buf;
556 int status;
557
558 xs_encode_stream_record_marker(&req->rq_snd_buf);
559
560 xs_pktdump("packet data:",
561 req->rq_svec->iov_base, req->rq_svec->iov_len);
562
563 status = xs_sendpages(transport->sock, NULL, 0,
564 xdr, req->rq_bytes_sent);
565 dprintk("RPC: %s(%u) = %d\n",
566 __func__, xdr->len - req->rq_bytes_sent, status);
567 if (likely(status >= 0)) {
568 req->rq_bytes_sent += status;
569 req->rq_xmit_bytes_sent += status;
570 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
571 req->rq_bytes_sent = 0;
572 return 0;
573 }
574 status = -EAGAIN;
575 }
576
577 switch (status) {
578 case -EAGAIN:
579 status = xs_nospace(task);
580 break;
581 default:
582 dprintk("RPC: sendmsg returned unrecognized error %d\n",
583 -status);
584 case -EPIPE:
585 xs_close(xprt);
586 status = -ENOTCONN;
587 }
588
589 return status;
590 }
591
592 /**
593 * xs_udp_send_request - write an RPC request to a UDP socket
594 * @task: address of RPC task that manages the state of an RPC request
595 *
596 * Return values:
597 * 0: The request has been sent
598 * EAGAIN: The socket was blocked, please call again later to
599 * complete the request
600 * ENOTCONN: Caller needs to invoke connect logic then call again
601 * other: Some other error occurred, the request was not sent
602 */
603 static int xs_udp_send_request(struct rpc_task *task)
604 {
605 struct rpc_rqst *req = task->tk_rqstp;
606 struct rpc_xprt *xprt = req->rq_xprt;
607 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
608 struct xdr_buf *xdr = &req->rq_snd_buf;
609 int status;
610
611 xs_pktdump("packet data:",
612 req->rq_svec->iov_base,
613 req->rq_svec->iov_len);
614
615 if (!xprt_bound(xprt))
616 return -ENOTCONN;
617 status = xs_sendpages(transport->sock,
618 xs_addr(xprt),
619 xprt->addrlen, xdr,
620 req->rq_bytes_sent);
621
622 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
623 xdr->len - req->rq_bytes_sent, status);
624
625 if (status >= 0) {
626 req->rq_xmit_bytes_sent += status;
627 if (status >= req->rq_slen)
628 return 0;
629 /* Still some bytes left; set up for a retry later. */
630 status = -EAGAIN;
631 }
632
633 switch (status) {
634 case -ENOTSOCK:
635 status = -ENOTCONN;
636 /* Should we call xs_close() here? */
637 break;
638 case -EAGAIN:
639 status = xs_nospace(task);
640 break;
641 default:
642 dprintk("RPC: sendmsg returned unrecognized error %d\n",
643 -status);
644 case -ENETUNREACH:
645 case -EPIPE:
646 case -ECONNREFUSED:
647 /* When the server has died, an ICMP port unreachable message
648 * prompts ECONNREFUSED. */
649 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
650 }
651
652 return status;
653 }
654
655 /**
656 * xs_tcp_shutdown - gracefully shut down a TCP socket
657 * @xprt: transport
658 *
659 * Initiates a graceful shutdown of the TCP socket by calling the
660 * equivalent of shutdown(SHUT_WR);
661 */
662 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
663 {
664 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
665 struct socket *sock = transport->sock;
666
667 if (sock != NULL)
668 kernel_sock_shutdown(sock, SHUT_WR);
669 }
670
671 /**
672 * xs_tcp_send_request - write an RPC request to a TCP socket
673 * @task: address of RPC task that manages the state of an RPC request
674 *
675 * Return values:
676 * 0: The request has been sent
677 * EAGAIN: The socket was blocked, please call again later to
678 * complete the request
679 * ENOTCONN: Caller needs to invoke connect logic then call again
680 * other: Some other error occurred, the request was not sent
681 *
682 * XXX: In the case of soft timeouts, should we eventually give up
683 * if sendmsg is not able to make progress?
684 */
685 static int xs_tcp_send_request(struct rpc_task *task)
686 {
687 struct rpc_rqst *req = task->tk_rqstp;
688 struct rpc_xprt *xprt = req->rq_xprt;
689 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
690 struct xdr_buf *xdr = &req->rq_snd_buf;
691 int status;
692
693 xs_encode_stream_record_marker(&req->rq_snd_buf);
694
695 xs_pktdump("packet data:",
696 req->rq_svec->iov_base,
697 req->rq_svec->iov_len);
698
699 /* Continue transmitting the packet/record. We must be careful
700 * to cope with writespace callbacks arriving _after_ we have
701 * called sendmsg(). */
702 while (1) {
703 status = xs_sendpages(transport->sock,
704 NULL, 0, xdr, req->rq_bytes_sent);
705
706 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
707 xdr->len - req->rq_bytes_sent, status);
708
709 if (unlikely(status < 0))
710 break;
711
712 /* If we've sent the entire packet, immediately
713 * reset the count of bytes sent. */
714 req->rq_bytes_sent += status;
715 req->rq_xmit_bytes_sent += status;
716 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
717 req->rq_bytes_sent = 0;
718 return 0;
719 }
720
721 if (status != 0)
722 continue;
723 status = -EAGAIN;
724 break;
725 }
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 xs_tcp_shutdown(xprt);
740 case -ECONNREFUSED:
741 case -ENOTCONN:
742 case -EPIPE:
743 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
744 }
745
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 == NULL)
768 goto out_release;
769 if (req->rq_bytes_sent == 0)
770 goto out_release;
771 if (req->rq_bytes_sent == req->rq_snd_buf.len)
772 goto out_release;
773 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
774 out_release:
775 xprt_release_xprt(xprt, task);
776 }
777
778 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
779 {
780 transport->old_data_ready = sk->sk_data_ready;
781 transport->old_state_change = sk->sk_state_change;
782 transport->old_write_space = sk->sk_write_space;
783 }
784
785 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
786 {
787 sk->sk_data_ready = transport->old_data_ready;
788 sk->sk_state_change = transport->old_state_change;
789 sk->sk_write_space = transport->old_write_space;
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 transport->srcport = 0;
801
802 write_lock_bh(&sk->sk_callback_lock);
803 transport->inet = NULL;
804 transport->sock = NULL;
805
806 sk->sk_user_data = NULL;
807
808 xs_restore_old_callbacks(transport, sk);
809 write_unlock_bh(&sk->sk_callback_lock);
810
811 sk->sk_no_check = 0;
812
813 sock_release(sock);
814 }
815
816 /**
817 * xs_close - close a socket
818 * @xprt: transport
819 *
820 * This is used when all requests are complete; ie, no DRC state remains
821 * on the server we want to save.
822 *
823 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
824 * xs_reset_transport() zeroing the socket from underneath a writer.
825 */
826 static void xs_close(struct rpc_xprt *xprt)
827 {
828 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
829
830 dprintk("RPC: xs_close xprt %p\n", xprt);
831
832 xs_reset_transport(transport);
833 xprt->reestablish_timeout = 0;
834
835 smp_mb__before_clear_bit();
836 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
837 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
838 clear_bit(XPRT_CLOSING, &xprt->state);
839 smp_mb__after_clear_bit();
840 xprt_disconnect_done(xprt);
841 }
842
843 static void xs_tcp_close(struct rpc_xprt *xprt)
844 {
845 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
846 xs_close(xprt);
847 else
848 xs_tcp_shutdown(xprt);
849 }
850
851 /**
852 * xs_destroy - prepare to shutdown a transport
853 * @xprt: doomed transport
854 *
855 */
856 static void xs_destroy(struct rpc_xprt *xprt)
857 {
858 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
859
860 dprintk("RPC: xs_destroy xprt %p\n", xprt);
861
862 cancel_delayed_work_sync(&transport->connect_worker);
863
864 xs_close(xprt);
865 xs_free_peer_addresses(xprt);
866 xprt_free(xprt);
867 module_put(THIS_MODULE);
868 }
869
870 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
871 {
872 return (struct rpc_xprt *) sk->sk_user_data;
873 }
874
875 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
876 {
877 struct xdr_skb_reader desc = {
878 .skb = skb,
879 .offset = sizeof(rpc_fraghdr),
880 .count = skb->len - sizeof(rpc_fraghdr),
881 };
882
883 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
884 return -1;
885 if (desc.count)
886 return -1;
887 return 0;
888 }
889
890 /**
891 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
892 * @sk: socket with data to read
893 * @len: how much data to read
894 *
895 * Currently this assumes we can read the whole reply in a single gulp.
896 */
897 static void xs_local_data_ready(struct sock *sk, int len)
898 {
899 struct rpc_task *task;
900 struct rpc_xprt *xprt;
901 struct rpc_rqst *rovr;
902 struct sk_buff *skb;
903 int err, repsize, copied;
904 u32 _xid;
905 __be32 *xp;
906
907 read_lock_bh(&sk->sk_callback_lock);
908 dprintk("RPC: %s...\n", __func__);
909 xprt = xprt_from_sock(sk);
910 if (xprt == NULL)
911 goto out;
912
913 skb = skb_recv_datagram(sk, 0, 1, &err);
914 if (skb == NULL)
915 goto out;
916
917 repsize = skb->len - sizeof(rpc_fraghdr);
918 if (repsize < 4) {
919 dprintk("RPC: impossible RPC reply size %d\n", repsize);
920 goto dropit;
921 }
922
923 /* Copy the XID from the skb... */
924 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
925 if (xp == NULL)
926 goto dropit;
927
928 /* Look up and lock the request corresponding to the given XID */
929 spin_lock(&xprt->transport_lock);
930 rovr = xprt_lookup_rqst(xprt, *xp);
931 if (!rovr)
932 goto out_unlock;
933 task = rovr->rq_task;
934
935 copied = rovr->rq_private_buf.buflen;
936 if (copied > repsize)
937 copied = repsize;
938
939 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
940 dprintk("RPC: sk_buff copy failed\n");
941 goto out_unlock;
942 }
943
944 xprt_complete_rqst(task, copied);
945
946 out_unlock:
947 spin_unlock(&xprt->transport_lock);
948 dropit:
949 skb_free_datagram(sk, skb);
950 out:
951 read_unlock_bh(&sk->sk_callback_lock);
952 }
953
954 /**
955 * xs_udp_data_ready - "data ready" callback for UDP sockets
956 * @sk: socket with data to read
957 * @len: how much data to read
958 *
959 */
960 static void xs_udp_data_ready(struct sock *sk, int len)
961 {
962 struct rpc_task *task;
963 struct rpc_xprt *xprt;
964 struct rpc_rqst *rovr;
965 struct sk_buff *skb;
966 int err, repsize, copied;
967 u32 _xid;
968 __be32 *xp;
969
970 read_lock_bh(&sk->sk_callback_lock);
971 dprintk("RPC: xs_udp_data_ready...\n");
972 if (!(xprt = xprt_from_sock(sk)))
973 goto out;
974
975 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
976 goto out;
977
978 repsize = skb->len - sizeof(struct udphdr);
979 if (repsize < 4) {
980 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
981 goto dropit;
982 }
983
984 /* Copy the XID from the skb... */
985 xp = skb_header_pointer(skb, sizeof(struct udphdr),
986 sizeof(_xid), &_xid);
987 if (xp == NULL)
988 goto dropit;
989
990 /* Look up and lock the request corresponding to the given XID */
991 spin_lock(&xprt->transport_lock);
992 rovr = xprt_lookup_rqst(xprt, *xp);
993 if (!rovr)
994 goto out_unlock;
995 task = rovr->rq_task;
996
997 if ((copied = rovr->rq_private_buf.buflen) > repsize)
998 copied = repsize;
999
1000 /* Suck it into the iovec, verify checksum if not done by hw. */
1001 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1002 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1003 goto out_unlock;
1004 }
1005
1006 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1007
1008 xprt_adjust_cwnd(task, copied);
1009 xprt_complete_rqst(task, copied);
1010
1011 out_unlock:
1012 spin_unlock(&xprt->transport_lock);
1013 dropit:
1014 skb_free_datagram(sk, skb);
1015 out:
1016 read_unlock_bh(&sk->sk_callback_lock);
1017 }
1018
1019 /*
1020 * Helper function to force a TCP close if the server is sending
1021 * junk and/or it has put us in CLOSE_WAIT
1022 */
1023 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1024 {
1025 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1026 xprt_force_disconnect(xprt);
1027 }
1028
1029 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1030 {
1031 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1032 size_t len, used;
1033 char *p;
1034
1035 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1036 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1037 used = xdr_skb_read_bits(desc, p, len);
1038 transport->tcp_offset += used;
1039 if (used != len)
1040 return;
1041
1042 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1043 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1044 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1045 else
1046 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1047 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1048
1049 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1050 transport->tcp_offset = 0;
1051
1052 /* Sanity check of the record length */
1053 if (unlikely(transport->tcp_reclen < 8)) {
1054 dprintk("RPC: invalid TCP record fragment length\n");
1055 xs_tcp_force_close(xprt);
1056 return;
1057 }
1058 dprintk("RPC: reading TCP record fragment of length %d\n",
1059 transport->tcp_reclen);
1060 }
1061
1062 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1063 {
1064 if (transport->tcp_offset == transport->tcp_reclen) {
1065 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1066 transport->tcp_offset = 0;
1067 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1068 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1069 transport->tcp_flags |= TCP_RCV_COPY_XID;
1070 transport->tcp_copied = 0;
1071 }
1072 }
1073 }
1074
1075 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1076 {
1077 size_t len, used;
1078 char *p;
1079
1080 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1081 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1082 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1083 used = xdr_skb_read_bits(desc, p, len);
1084 transport->tcp_offset += used;
1085 if (used != len)
1086 return;
1087 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1088 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1089 transport->tcp_copied = 4;
1090 dprintk("RPC: reading %s XID %08x\n",
1091 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1092 : "request with",
1093 ntohl(transport->tcp_xid));
1094 xs_tcp_check_fraghdr(transport);
1095 }
1096
1097 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1098 struct xdr_skb_reader *desc)
1099 {
1100 size_t len, used;
1101 u32 offset;
1102 char *p;
1103
1104 /*
1105 * We want transport->tcp_offset to be 8 at the end of this routine
1106 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1107 * When this function is called for the first time,
1108 * transport->tcp_offset is 4 (after having already read the xid).
1109 */
1110 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1111 len = sizeof(transport->tcp_calldir) - offset;
1112 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1113 p = ((char *) &transport->tcp_calldir) + offset;
1114 used = xdr_skb_read_bits(desc, p, len);
1115 transport->tcp_offset += used;
1116 if (used != len)
1117 return;
1118 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1119 /*
1120 * We don't yet have the XDR buffer, so we will write the calldir
1121 * out after we get the buffer from the 'struct rpc_rqst'
1122 */
1123 switch (ntohl(transport->tcp_calldir)) {
1124 case RPC_REPLY:
1125 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1126 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1127 transport->tcp_flags |= TCP_RPC_REPLY;
1128 break;
1129 case RPC_CALL:
1130 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1131 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1132 transport->tcp_flags &= ~TCP_RPC_REPLY;
1133 break;
1134 default:
1135 dprintk("RPC: invalid request message type\n");
1136 xs_tcp_force_close(&transport->xprt);
1137 }
1138 xs_tcp_check_fraghdr(transport);
1139 }
1140
1141 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1142 struct xdr_skb_reader *desc,
1143 struct rpc_rqst *req)
1144 {
1145 struct sock_xprt *transport =
1146 container_of(xprt, struct sock_xprt, xprt);
1147 struct xdr_buf *rcvbuf;
1148 size_t len;
1149 ssize_t r;
1150
1151 rcvbuf = &req->rq_private_buf;
1152
1153 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1154 /*
1155 * Save the RPC direction in the XDR buffer
1156 */
1157 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1158 &transport->tcp_calldir,
1159 sizeof(transport->tcp_calldir));
1160 transport->tcp_copied += sizeof(transport->tcp_calldir);
1161 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1162 }
1163
1164 len = desc->count;
1165 if (len > transport->tcp_reclen - transport->tcp_offset) {
1166 struct xdr_skb_reader my_desc;
1167
1168 len = transport->tcp_reclen - transport->tcp_offset;
1169 memcpy(&my_desc, desc, sizeof(my_desc));
1170 my_desc.count = len;
1171 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1172 &my_desc, xdr_skb_read_bits);
1173 desc->count -= r;
1174 desc->offset += r;
1175 } else
1176 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1177 desc, xdr_skb_read_bits);
1178
1179 if (r > 0) {
1180 transport->tcp_copied += r;
1181 transport->tcp_offset += r;
1182 }
1183 if (r != len) {
1184 /* Error when copying to the receive buffer,
1185 * usually because we weren't able to allocate
1186 * additional buffer pages. All we can do now
1187 * is turn off TCP_RCV_COPY_DATA, so the request
1188 * will not receive any additional updates,
1189 * and time out.
1190 * Any remaining data from this record will
1191 * be discarded.
1192 */
1193 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1194 dprintk("RPC: XID %08x truncated request\n",
1195 ntohl(transport->tcp_xid));
1196 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1197 "tcp_offset = %u, tcp_reclen = %u\n",
1198 xprt, transport->tcp_copied,
1199 transport->tcp_offset, transport->tcp_reclen);
1200 return;
1201 }
1202
1203 dprintk("RPC: XID %08x read %Zd bytes\n",
1204 ntohl(transport->tcp_xid), r);
1205 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1206 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1207 transport->tcp_offset, transport->tcp_reclen);
1208
1209 if (transport->tcp_copied == req->rq_private_buf.buflen)
1210 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1211 else if (transport->tcp_offset == transport->tcp_reclen) {
1212 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1214 }
1215 }
1216
1217 /*
1218 * Finds the request corresponding to the RPC xid and invokes the common
1219 * tcp read code to read the data.
1220 */
1221 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1222 struct xdr_skb_reader *desc)
1223 {
1224 struct sock_xprt *transport =
1225 container_of(xprt, struct sock_xprt, xprt);
1226 struct rpc_rqst *req;
1227
1228 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1229
1230 /* Find and lock the request corresponding to this xid */
1231 spin_lock(&xprt->transport_lock);
1232 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1233 if (!req) {
1234 dprintk("RPC: XID %08x request not found!\n",
1235 ntohl(transport->tcp_xid));
1236 spin_unlock(&xprt->transport_lock);
1237 return -1;
1238 }
1239
1240 xs_tcp_read_common(xprt, desc, req);
1241
1242 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1243 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1244
1245 spin_unlock(&xprt->transport_lock);
1246 return 0;
1247 }
1248
1249 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1250 /*
1251 * Obtains an rpc_rqst previously allocated and invokes the common
1252 * tcp read code to read the data. The result is placed in the callback
1253 * queue.
1254 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1255 * connection and return -1.
1256 */
1257 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1258 struct xdr_skb_reader *desc)
1259 {
1260 struct sock_xprt *transport =
1261 container_of(xprt, struct sock_xprt, xprt);
1262 struct rpc_rqst *req;
1263
1264 req = xprt_alloc_bc_request(xprt);
1265 if (req == NULL) {
1266 printk(KERN_WARNING "Callback slot table overflowed\n");
1267 xprt_force_disconnect(xprt);
1268 return -1;
1269 }
1270
1271 req->rq_xid = transport->tcp_xid;
1272 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1273 xs_tcp_read_common(xprt, desc, req);
1274
1275 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1276 struct svc_serv *bc_serv = xprt->bc_serv;
1277
1278 /*
1279 * Add callback request to callback list. The callback
1280 * service sleeps on the sv_cb_waitq waiting for new
1281 * requests. Wake it up after adding enqueing the
1282 * request.
1283 */
1284 dprintk("RPC: add callback request to list\n");
1285 spin_lock(&bc_serv->sv_cb_lock);
1286 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1287 spin_unlock(&bc_serv->sv_cb_lock);
1288 wake_up(&bc_serv->sv_cb_waitq);
1289 }
1290
1291 req->rq_private_buf.len = transport->tcp_copied;
1292
1293 return 0;
1294 }
1295
1296 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1297 struct xdr_skb_reader *desc)
1298 {
1299 struct sock_xprt *transport =
1300 container_of(xprt, struct sock_xprt, xprt);
1301
1302 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1303 xs_tcp_read_reply(xprt, desc) :
1304 xs_tcp_read_callback(xprt, desc);
1305 }
1306 #else
1307 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1308 struct xdr_skb_reader *desc)
1309 {
1310 return xs_tcp_read_reply(xprt, desc);
1311 }
1312 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1313
1314 /*
1315 * Read data off the transport. This can be either an RPC_CALL or an
1316 * RPC_REPLY. Relay the processing to helper functions.
1317 */
1318 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1319 struct xdr_skb_reader *desc)
1320 {
1321 struct sock_xprt *transport =
1322 container_of(xprt, struct sock_xprt, xprt);
1323
1324 if (_xs_tcp_read_data(xprt, desc) == 0)
1325 xs_tcp_check_fraghdr(transport);
1326 else {
1327 /*
1328 * The transport_lock protects the request handling.
1329 * There's no need to hold it to update the tcp_flags.
1330 */
1331 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1332 }
1333 }
1334
1335 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1336 {
1337 size_t len;
1338
1339 len = transport->tcp_reclen - transport->tcp_offset;
1340 if (len > desc->count)
1341 len = desc->count;
1342 desc->count -= len;
1343 desc->offset += len;
1344 transport->tcp_offset += len;
1345 dprintk("RPC: discarded %Zu bytes\n", len);
1346 xs_tcp_check_fraghdr(transport);
1347 }
1348
1349 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1350 {
1351 struct rpc_xprt *xprt = rd_desc->arg.data;
1352 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1353 struct xdr_skb_reader desc = {
1354 .skb = skb,
1355 .offset = offset,
1356 .count = len,
1357 };
1358
1359 dprintk("RPC: xs_tcp_data_recv started\n");
1360 do {
1361 /* Read in a new fragment marker if necessary */
1362 /* Can we ever really expect to get completely empty fragments? */
1363 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1364 xs_tcp_read_fraghdr(xprt, &desc);
1365 continue;
1366 }
1367 /* Read in the xid if necessary */
1368 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1369 xs_tcp_read_xid(transport, &desc);
1370 continue;
1371 }
1372 /* Read in the call/reply flag */
1373 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1374 xs_tcp_read_calldir(transport, &desc);
1375 continue;
1376 }
1377 /* Read in the request data */
1378 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1379 xs_tcp_read_data(xprt, &desc);
1380 continue;
1381 }
1382 /* Skip over any trailing bytes on short reads */
1383 xs_tcp_read_discard(transport, &desc);
1384 } while (desc.count);
1385 dprintk("RPC: xs_tcp_data_recv done\n");
1386 return len - desc.count;
1387 }
1388
1389 /**
1390 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1391 * @sk: socket with data to read
1392 * @bytes: how much data to read
1393 *
1394 */
1395 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1396 {
1397 struct rpc_xprt *xprt;
1398 read_descriptor_t rd_desc;
1399 int read;
1400
1401 dprintk("RPC: xs_tcp_data_ready...\n");
1402
1403 read_lock_bh(&sk->sk_callback_lock);
1404 if (!(xprt = xprt_from_sock(sk)))
1405 goto out;
1406 /* Any data means we had a useful conversation, so
1407 * the we don't need to delay the next reconnect
1408 */
1409 if (xprt->reestablish_timeout)
1410 xprt->reestablish_timeout = 0;
1411
1412 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1413 rd_desc.arg.data = xprt;
1414 do {
1415 rd_desc.count = 65536;
1416 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1417 } while (read > 0);
1418 out:
1419 read_unlock_bh(&sk->sk_callback_lock);
1420 }
1421
1422 /*
1423 * Do the equivalent of linger/linger2 handling for dealing with
1424 * broken servers that don't close the socket in a timely
1425 * fashion
1426 */
1427 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1428 unsigned long timeout)
1429 {
1430 struct sock_xprt *transport;
1431
1432 if (xprt_test_and_set_connecting(xprt))
1433 return;
1434 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1435 transport = container_of(xprt, struct sock_xprt, xprt);
1436 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1437 timeout);
1438 }
1439
1440 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1441 {
1442 struct sock_xprt *transport;
1443
1444 transport = container_of(xprt, struct sock_xprt, xprt);
1445
1446 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1447 !cancel_delayed_work(&transport->connect_worker))
1448 return;
1449 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1450 xprt_clear_connecting(xprt);
1451 }
1452
1453 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1454 {
1455 smp_mb__before_clear_bit();
1456 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1457 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1458 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1459 clear_bit(XPRT_CLOSING, &xprt->state);
1460 smp_mb__after_clear_bit();
1461 }
1462
1463 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1464 {
1465 xs_sock_reset_connection_flags(xprt);
1466 /* Mark transport as closed and wake up all pending tasks */
1467 xprt_disconnect_done(xprt);
1468 }
1469
1470 /**
1471 * xs_tcp_state_change - callback to handle TCP socket state changes
1472 * @sk: socket whose state has changed
1473 *
1474 */
1475 static void xs_tcp_state_change(struct sock *sk)
1476 {
1477 struct rpc_xprt *xprt;
1478
1479 read_lock_bh(&sk->sk_callback_lock);
1480 if (!(xprt = xprt_from_sock(sk)))
1481 goto out;
1482 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1483 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1484 sk->sk_state, xprt_connected(xprt),
1485 sock_flag(sk, SOCK_DEAD),
1486 sock_flag(sk, SOCK_ZAPPED),
1487 sk->sk_shutdown);
1488
1489 switch (sk->sk_state) {
1490 case TCP_ESTABLISHED:
1491 spin_lock(&xprt->transport_lock);
1492 if (!xprt_test_and_set_connected(xprt)) {
1493 struct sock_xprt *transport = container_of(xprt,
1494 struct sock_xprt, xprt);
1495
1496 /* Reset TCP record info */
1497 transport->tcp_offset = 0;
1498 transport->tcp_reclen = 0;
1499 transport->tcp_copied = 0;
1500 transport->tcp_flags =
1501 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1502
1503 xprt_wake_pending_tasks(xprt, -EAGAIN);
1504 }
1505 spin_unlock(&xprt->transport_lock);
1506 break;
1507 case TCP_FIN_WAIT1:
1508 /* The client initiated a shutdown of the socket */
1509 xprt->connect_cookie++;
1510 xprt->reestablish_timeout = 0;
1511 set_bit(XPRT_CLOSING, &xprt->state);
1512 smp_mb__before_clear_bit();
1513 clear_bit(XPRT_CONNECTED, &xprt->state);
1514 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1515 smp_mb__after_clear_bit();
1516 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1517 break;
1518 case TCP_CLOSE_WAIT:
1519 /* The server initiated a shutdown of the socket */
1520 xprt->connect_cookie++;
1521 clear_bit(XPRT_CONNECTED, &xprt->state);
1522 xs_tcp_force_close(xprt);
1523 case TCP_CLOSING:
1524 /*
1525 * If the server closed down the connection, make sure that
1526 * we back off before reconnecting
1527 */
1528 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1529 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1530 break;
1531 case TCP_LAST_ACK:
1532 set_bit(XPRT_CLOSING, &xprt->state);
1533 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1534 smp_mb__before_clear_bit();
1535 clear_bit(XPRT_CONNECTED, &xprt->state);
1536 smp_mb__after_clear_bit();
1537 break;
1538 case TCP_CLOSE:
1539 xs_tcp_cancel_linger_timeout(xprt);
1540 xs_sock_mark_closed(xprt);
1541 }
1542 out:
1543 read_unlock_bh(&sk->sk_callback_lock);
1544 }
1545
1546 static void xs_write_space(struct sock *sk)
1547 {
1548 struct socket *sock;
1549 struct rpc_xprt *xprt;
1550
1551 if (unlikely(!(sock = sk->sk_socket)))
1552 return;
1553 clear_bit(SOCK_NOSPACE, &sock->flags);
1554
1555 if (unlikely(!(xprt = xprt_from_sock(sk))))
1556 return;
1557 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1558 return;
1559
1560 xprt_write_space(xprt);
1561 }
1562
1563 /**
1564 * xs_udp_write_space - callback invoked when socket buffer space
1565 * becomes available
1566 * @sk: socket whose state has changed
1567 *
1568 * Called when more output buffer space is available for this socket.
1569 * We try not to wake our writers until they can make "significant"
1570 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1571 * with a bunch of small requests.
1572 */
1573 static void xs_udp_write_space(struct sock *sk)
1574 {
1575 read_lock_bh(&sk->sk_callback_lock);
1576
1577 /* from net/core/sock.c:sock_def_write_space */
1578 if (sock_writeable(sk))
1579 xs_write_space(sk);
1580
1581 read_unlock_bh(&sk->sk_callback_lock);
1582 }
1583
1584 /**
1585 * xs_tcp_write_space - callback invoked when socket buffer space
1586 * becomes available
1587 * @sk: socket whose state has changed
1588 *
1589 * Called when more output buffer space is available for this socket.
1590 * We try not to wake our writers until they can make "significant"
1591 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1592 * with a bunch of small requests.
1593 */
1594 static void xs_tcp_write_space(struct sock *sk)
1595 {
1596 read_lock_bh(&sk->sk_callback_lock);
1597
1598 /* from net/core/stream.c:sk_stream_write_space */
1599 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1600 xs_write_space(sk);
1601
1602 read_unlock_bh(&sk->sk_callback_lock);
1603 }
1604
1605 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1606 {
1607 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1608 struct sock *sk = transport->inet;
1609
1610 if (transport->rcvsize) {
1611 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1612 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1613 }
1614 if (transport->sndsize) {
1615 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1616 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1617 sk->sk_write_space(sk);
1618 }
1619 }
1620
1621 /**
1622 * xs_udp_set_buffer_size - set send and receive limits
1623 * @xprt: generic transport
1624 * @sndsize: requested size of send buffer, in bytes
1625 * @rcvsize: requested size of receive buffer, in bytes
1626 *
1627 * Set socket send and receive buffer size limits.
1628 */
1629 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1630 {
1631 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1632
1633 transport->sndsize = 0;
1634 if (sndsize)
1635 transport->sndsize = sndsize + 1024;
1636 transport->rcvsize = 0;
1637 if (rcvsize)
1638 transport->rcvsize = rcvsize + 1024;
1639
1640 xs_udp_do_set_buffer_size(xprt);
1641 }
1642
1643 /**
1644 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1645 * @task: task that timed out
1646 *
1647 * Adjust the congestion window after a retransmit timeout has occurred.
1648 */
1649 static void xs_udp_timer(struct rpc_task *task)
1650 {
1651 xprt_adjust_cwnd(task, -ETIMEDOUT);
1652 }
1653
1654 static unsigned short xs_get_random_port(void)
1655 {
1656 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1657 unsigned short rand = (unsigned short) net_random() % range;
1658 return rand + xprt_min_resvport;
1659 }
1660
1661 /**
1662 * xs_set_port - reset the port number in the remote endpoint address
1663 * @xprt: generic transport
1664 * @port: new port number
1665 *
1666 */
1667 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1668 {
1669 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1670
1671 rpc_set_port(xs_addr(xprt), port);
1672 xs_update_peer_port(xprt);
1673 }
1674
1675 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1676 {
1677 unsigned short port = transport->srcport;
1678
1679 if (port == 0 && transport->xprt.resvport)
1680 port = xs_get_random_port();
1681 return port;
1682 }
1683
1684 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1685 {
1686 if (transport->srcport != 0)
1687 transport->srcport = 0;
1688 if (!transport->xprt.resvport)
1689 return 0;
1690 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1691 return xprt_max_resvport;
1692 return --port;
1693 }
1694 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1695 {
1696 struct sockaddr_storage myaddr;
1697 int err, nloop = 0;
1698 unsigned short port = xs_get_srcport(transport);
1699 unsigned short last;
1700
1701 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1702 do {
1703 rpc_set_port((struct sockaddr *)&myaddr, port);
1704 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1705 transport->xprt.addrlen);
1706 if (port == 0)
1707 break;
1708 if (err == 0) {
1709 transport->srcport = port;
1710 break;
1711 }
1712 last = port;
1713 port = xs_next_srcport(transport, port);
1714 if (port > last)
1715 nloop++;
1716 } while (err == -EADDRINUSE && nloop != 2);
1717
1718 if (myaddr.ss_family == AF_INET)
1719 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1720 &((struct sockaddr_in *)&myaddr)->sin_addr,
1721 port, err ? "failed" : "ok", err);
1722 else
1723 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1724 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1725 port, err ? "failed" : "ok", err);
1726 return err;
1727 }
1728
1729 /*
1730 * We don't support autobind on AF_LOCAL sockets
1731 */
1732 static void xs_local_rpcbind(struct rpc_task *task)
1733 {
1734 xprt_set_bound(task->tk_xprt);
1735 }
1736
1737 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1738 {
1739 }
1740
1741 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1742 static struct lock_class_key xs_key[2];
1743 static struct lock_class_key xs_slock_key[2];
1744
1745 static inline void xs_reclassify_socketu(struct socket *sock)
1746 {
1747 struct sock *sk = sock->sk;
1748
1749 BUG_ON(sock_owned_by_user(sk));
1750 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1751 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1752 }
1753
1754 static inline void xs_reclassify_socket4(struct socket *sock)
1755 {
1756 struct sock *sk = sock->sk;
1757
1758 BUG_ON(sock_owned_by_user(sk));
1759 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1760 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1761 }
1762
1763 static inline void xs_reclassify_socket6(struct socket *sock)
1764 {
1765 struct sock *sk = sock->sk;
1766
1767 BUG_ON(sock_owned_by_user(sk));
1768 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1769 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1770 }
1771
1772 static inline void xs_reclassify_socket(int family, struct socket *sock)
1773 {
1774 switch (family) {
1775 case AF_LOCAL:
1776 xs_reclassify_socketu(sock);
1777 break;
1778 case AF_INET:
1779 xs_reclassify_socket4(sock);
1780 break;
1781 case AF_INET6:
1782 xs_reclassify_socket6(sock);
1783 break;
1784 }
1785 }
1786 #else
1787 static inline void xs_reclassify_socketu(struct socket *sock)
1788 {
1789 }
1790
1791 static inline void xs_reclassify_socket4(struct socket *sock)
1792 {
1793 }
1794
1795 static inline void xs_reclassify_socket6(struct socket *sock)
1796 {
1797 }
1798
1799 static inline void xs_reclassify_socket(int family, struct socket *sock)
1800 {
1801 }
1802 #endif
1803
1804 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1805 struct sock_xprt *transport, int family, int type, int protocol)
1806 {
1807 struct socket *sock;
1808 int err;
1809
1810 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1811 if (err < 0) {
1812 dprintk("RPC: can't create %d transport socket (%d).\n",
1813 protocol, -err);
1814 goto out;
1815 }
1816 xs_reclassify_socket(family, sock);
1817
1818 err = xs_bind(transport, sock);
1819 if (err) {
1820 sock_release(sock);
1821 goto out;
1822 }
1823
1824 return sock;
1825 out:
1826 return ERR_PTR(err);
1827 }
1828
1829 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1830 struct socket *sock)
1831 {
1832 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1833 xprt);
1834
1835 if (!transport->inet) {
1836 struct sock *sk = sock->sk;
1837
1838 write_lock_bh(&sk->sk_callback_lock);
1839
1840 xs_save_old_callbacks(transport, sk);
1841
1842 sk->sk_user_data = xprt;
1843 sk->sk_data_ready = xs_local_data_ready;
1844 sk->sk_write_space = xs_udp_write_space;
1845 sk->sk_allocation = GFP_ATOMIC;
1846
1847 xprt_clear_connected(xprt);
1848
1849 /* Reset to new socket */
1850 transport->sock = sock;
1851 transport->inet = sk;
1852
1853 write_unlock_bh(&sk->sk_callback_lock);
1854 }
1855
1856 /* Tell the socket layer to start connecting... */
1857 xprt->stat.connect_count++;
1858 xprt->stat.connect_start = jiffies;
1859 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1860 }
1861
1862 /**
1863 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1864 * @xprt: RPC transport to connect
1865 * @transport: socket transport to connect
1866 * @create_sock: function to create a socket of the correct type
1867 *
1868 * Invoked by a work queue tasklet.
1869 */
1870 static void xs_local_setup_socket(struct work_struct *work)
1871 {
1872 struct sock_xprt *transport =
1873 container_of(work, struct sock_xprt, connect_worker.work);
1874 struct rpc_xprt *xprt = &transport->xprt;
1875 struct socket *sock;
1876 int status = -EIO;
1877
1878 current->flags |= PF_FSTRANS;
1879
1880 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1881 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1882 SOCK_STREAM, 0, &sock, 1);
1883 if (status < 0) {
1884 dprintk("RPC: can't create AF_LOCAL "
1885 "transport socket (%d).\n", -status);
1886 goto out;
1887 }
1888 xs_reclassify_socketu(sock);
1889
1890 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1891 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1892
1893 status = xs_local_finish_connecting(xprt, sock);
1894 switch (status) {
1895 case 0:
1896 dprintk("RPC: xprt %p connected to %s\n",
1897 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1898 xprt_set_connected(xprt);
1899 break;
1900 case -ENOENT:
1901 dprintk("RPC: xprt %p: socket %s does not exist\n",
1902 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1903 break;
1904 default:
1905 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1906 __func__, -status,
1907 xprt->address_strings[RPC_DISPLAY_ADDR]);
1908 }
1909
1910 out:
1911 xprt_clear_connecting(xprt);
1912 xprt_wake_pending_tasks(xprt, status);
1913 current->flags &= ~PF_FSTRANS;
1914 }
1915
1916 #ifdef CONFIG_SUNRPC_SWAP
1917 static void xs_set_memalloc(struct rpc_xprt *xprt)
1918 {
1919 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1920 xprt);
1921
1922 if (xprt->swapper)
1923 sk_set_memalloc(transport->inet);
1924 }
1925
1926 /**
1927 * xs_swapper - Tag this transport as being used for swap.
1928 * @xprt: transport to tag
1929 * @enable: enable/disable
1930 *
1931 */
1932 int xs_swapper(struct rpc_xprt *xprt, int enable)
1933 {
1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1935 xprt);
1936 int err = 0;
1937
1938 if (enable) {
1939 xprt->swapper++;
1940 xs_set_memalloc(xprt);
1941 } else if (xprt->swapper) {
1942 xprt->swapper--;
1943 sk_clear_memalloc(transport->inet);
1944 }
1945
1946 return err;
1947 }
1948 EXPORT_SYMBOL_GPL(xs_swapper);
1949 #else
1950 static void xs_set_memalloc(struct rpc_xprt *xprt)
1951 {
1952 }
1953 #endif
1954
1955 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1956 {
1957 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1958
1959 if (!transport->inet) {
1960 struct sock *sk = sock->sk;
1961
1962 write_lock_bh(&sk->sk_callback_lock);
1963
1964 xs_save_old_callbacks(transport, sk);
1965
1966 sk->sk_user_data = xprt;
1967 sk->sk_data_ready = xs_udp_data_ready;
1968 sk->sk_write_space = xs_udp_write_space;
1969 sk->sk_no_check = UDP_CSUM_NORCV;
1970 sk->sk_allocation = GFP_ATOMIC;
1971
1972 xprt_set_connected(xprt);
1973
1974 /* Reset to new socket */
1975 transport->sock = sock;
1976 transport->inet = sk;
1977
1978 xs_set_memalloc(xprt);
1979
1980 write_unlock_bh(&sk->sk_callback_lock);
1981 }
1982 xs_udp_do_set_buffer_size(xprt);
1983 }
1984
1985 static void xs_udp_setup_socket(struct work_struct *work)
1986 {
1987 struct sock_xprt *transport =
1988 container_of(work, struct sock_xprt, connect_worker.work);
1989 struct rpc_xprt *xprt = &transport->xprt;
1990 struct socket *sock = transport->sock;
1991 int status = -EIO;
1992
1993 current->flags |= PF_FSTRANS;
1994
1995 /* Start by resetting any existing state */
1996 xs_reset_transport(transport);
1997 sock = xs_create_sock(xprt, transport,
1998 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1999 if (IS_ERR(sock))
2000 goto out;
2001
2002 dprintk("RPC: worker connecting xprt %p via %s to "
2003 "%s (port %s)\n", xprt,
2004 xprt->address_strings[RPC_DISPLAY_PROTO],
2005 xprt->address_strings[RPC_DISPLAY_ADDR],
2006 xprt->address_strings[RPC_DISPLAY_PORT]);
2007
2008 xs_udp_finish_connecting(xprt, sock);
2009 status = 0;
2010 out:
2011 xprt_clear_connecting(xprt);
2012 xprt_wake_pending_tasks(xprt, status);
2013 current->flags &= ~PF_FSTRANS;
2014 }
2015
2016 /*
2017 * We need to preserve the port number so the reply cache on the server can
2018 * find our cached RPC replies when we get around to reconnecting.
2019 */
2020 static void xs_abort_connection(struct sock_xprt *transport)
2021 {
2022 int result;
2023 struct sockaddr any;
2024
2025 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2026
2027 /*
2028 * Disconnect the transport socket by doing a connect operation
2029 * with AF_UNSPEC. This should return immediately...
2030 */
2031 memset(&any, 0, sizeof(any));
2032 any.sa_family = AF_UNSPEC;
2033 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2034 if (!result)
2035 xs_sock_reset_connection_flags(&transport->xprt);
2036 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
2037 }
2038
2039 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2040 {
2041 unsigned int state = transport->inet->sk_state;
2042
2043 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2044 /* we don't need to abort the connection if the socket
2045 * hasn't undergone a shutdown
2046 */
2047 if (transport->inet->sk_shutdown == 0)
2048 return;
2049 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2050 __func__, transport->inet->sk_shutdown);
2051 }
2052 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2053 /* we don't need to abort the connection if the socket
2054 * hasn't undergone a shutdown
2055 */
2056 if (transport->inet->sk_shutdown == 0)
2057 return;
2058 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2059 "sk_shutdown set to %d\n",
2060 __func__, transport->inet->sk_shutdown);
2061 }
2062 xs_abort_connection(transport);
2063 }
2064
2065 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2066 {
2067 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2068 int ret = -ENOTCONN;
2069
2070 if (!transport->inet) {
2071 struct sock *sk = sock->sk;
2072
2073 write_lock_bh(&sk->sk_callback_lock);
2074
2075 xs_save_old_callbacks(transport, sk);
2076
2077 sk->sk_user_data = xprt;
2078 sk->sk_data_ready = xs_tcp_data_ready;
2079 sk->sk_state_change = xs_tcp_state_change;
2080 sk->sk_write_space = xs_tcp_write_space;
2081 sk->sk_allocation = GFP_ATOMIC;
2082
2083 /* socket options */
2084 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2085 sock_reset_flag(sk, SOCK_LINGER);
2086 tcp_sk(sk)->linger2 = 0;
2087 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2088
2089 xprt_clear_connected(xprt);
2090
2091 /* Reset to new socket */
2092 transport->sock = sock;
2093 transport->inet = sk;
2094
2095 write_unlock_bh(&sk->sk_callback_lock);
2096 }
2097
2098 if (!xprt_bound(xprt))
2099 goto out;
2100
2101 xs_set_memalloc(xprt);
2102
2103 /* Tell the socket layer to start connecting... */
2104 xprt->stat.connect_count++;
2105 xprt->stat.connect_start = jiffies;
2106 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2107 switch (ret) {
2108 case 0:
2109 case -EINPROGRESS:
2110 /* SYN_SENT! */
2111 xprt->connect_cookie++;
2112 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2113 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2114 }
2115 out:
2116 return ret;
2117 }
2118
2119 /**
2120 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2121 * @xprt: RPC transport to connect
2122 * @transport: socket transport to connect
2123 * @create_sock: function to create a socket of the correct type
2124 *
2125 * Invoked by a work queue tasklet.
2126 */
2127 static void xs_tcp_setup_socket(struct work_struct *work)
2128 {
2129 struct sock_xprt *transport =
2130 container_of(work, struct sock_xprt, connect_worker.work);
2131 struct socket *sock = transport->sock;
2132 struct rpc_xprt *xprt = &transport->xprt;
2133 int status = -EIO;
2134
2135 current->flags |= PF_FSTRANS;
2136
2137 if (!sock) {
2138 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2139 sock = xs_create_sock(xprt, transport,
2140 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2141 if (IS_ERR(sock)) {
2142 status = PTR_ERR(sock);
2143 goto out;
2144 }
2145 } else {
2146 int abort_and_exit;
2147
2148 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2149 &xprt->state);
2150 /* "close" the socket, preserving the local port */
2151 xs_tcp_reuse_connection(transport);
2152
2153 if (abort_and_exit)
2154 goto out_eagain;
2155 }
2156
2157 dprintk("RPC: worker connecting xprt %p via %s to "
2158 "%s (port %s)\n", xprt,
2159 xprt->address_strings[RPC_DISPLAY_PROTO],
2160 xprt->address_strings[RPC_DISPLAY_ADDR],
2161 xprt->address_strings[RPC_DISPLAY_PORT]);
2162
2163 status = xs_tcp_finish_connecting(xprt, sock);
2164 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2165 xprt, -status, xprt_connected(xprt),
2166 sock->sk->sk_state);
2167 switch (status) {
2168 default:
2169 printk("%s: connect returned unhandled error %d\n",
2170 __func__, status);
2171 case -EADDRNOTAVAIL:
2172 /* We're probably in TIME_WAIT. Get rid of existing socket,
2173 * and retry
2174 */
2175 xs_tcp_force_close(xprt);
2176 break;
2177 case -ECONNREFUSED:
2178 case -ECONNRESET:
2179 case -ENETUNREACH:
2180 /* retry with existing socket, after a delay */
2181 case 0:
2182 case -EINPROGRESS:
2183 case -EALREADY:
2184 xprt_clear_connecting(xprt);
2185 current->flags &= ~PF_FSTRANS;
2186 return;
2187 case -EINVAL:
2188 /* Happens, for instance, if the user specified a link
2189 * local IPv6 address without a scope-id.
2190 */
2191 goto out;
2192 }
2193 out_eagain:
2194 status = -EAGAIN;
2195 out:
2196 xprt_clear_connecting(xprt);
2197 xprt_wake_pending_tasks(xprt, status);
2198 current->flags &= ~PF_FSTRANS;
2199 }
2200
2201 /**
2202 * xs_connect - connect a socket to a remote endpoint
2203 * @task: address of RPC task that manages state of connect request
2204 *
2205 * TCP: If the remote end dropped the connection, delay reconnecting.
2206 *
2207 * UDP socket connects are synchronous, but we use a work queue anyway
2208 * to guarantee that even unprivileged user processes can set up a
2209 * socket on a privileged port.
2210 *
2211 * If a UDP socket connect fails, the delay behavior here prevents
2212 * retry floods (hard mounts).
2213 */
2214 static void xs_connect(struct rpc_task *task)
2215 {
2216 struct rpc_xprt *xprt = task->tk_xprt;
2217 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2218
2219 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2220 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2221 "seconds\n",
2222 xprt, xprt->reestablish_timeout / HZ);
2223 queue_delayed_work(rpciod_workqueue,
2224 &transport->connect_worker,
2225 xprt->reestablish_timeout);
2226 xprt->reestablish_timeout <<= 1;
2227 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2228 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2229 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2230 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2231 } else {
2232 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2233 queue_delayed_work(rpciod_workqueue,
2234 &transport->connect_worker, 0);
2235 }
2236 }
2237
2238 /**
2239 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2240 * @xprt: rpc_xprt struct containing statistics
2241 * @seq: output file
2242 *
2243 */
2244 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2245 {
2246 long idle_time = 0;
2247
2248 if (xprt_connected(xprt))
2249 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2250
2251 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2252 "%llu %llu %lu %llu %llu\n",
2253 xprt->stat.bind_count,
2254 xprt->stat.connect_count,
2255 xprt->stat.connect_time,
2256 idle_time,
2257 xprt->stat.sends,
2258 xprt->stat.recvs,
2259 xprt->stat.bad_xids,
2260 xprt->stat.req_u,
2261 xprt->stat.bklog_u,
2262 xprt->stat.max_slots,
2263 xprt->stat.sending_u,
2264 xprt->stat.pending_u);
2265 }
2266
2267 /**
2268 * xs_udp_print_stats - display UDP socket-specifc stats
2269 * @xprt: rpc_xprt struct containing statistics
2270 * @seq: output file
2271 *
2272 */
2273 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2274 {
2275 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2276
2277 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2278 "%lu %llu %llu\n",
2279 transport->srcport,
2280 xprt->stat.bind_count,
2281 xprt->stat.sends,
2282 xprt->stat.recvs,
2283 xprt->stat.bad_xids,
2284 xprt->stat.req_u,
2285 xprt->stat.bklog_u,
2286 xprt->stat.max_slots,
2287 xprt->stat.sending_u,
2288 xprt->stat.pending_u);
2289 }
2290
2291 /**
2292 * xs_tcp_print_stats - display TCP socket-specifc stats
2293 * @xprt: rpc_xprt struct containing statistics
2294 * @seq: output file
2295 *
2296 */
2297 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2298 {
2299 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2300 long idle_time = 0;
2301
2302 if (xprt_connected(xprt))
2303 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2304
2305 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2306 "%llu %llu %lu %llu %llu\n",
2307 transport->srcport,
2308 xprt->stat.bind_count,
2309 xprt->stat.connect_count,
2310 xprt->stat.connect_time,
2311 idle_time,
2312 xprt->stat.sends,
2313 xprt->stat.recvs,
2314 xprt->stat.bad_xids,
2315 xprt->stat.req_u,
2316 xprt->stat.bklog_u,
2317 xprt->stat.max_slots,
2318 xprt->stat.sending_u,
2319 xprt->stat.pending_u);
2320 }
2321
2322 /*
2323 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2324 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2325 * to use the server side send routines.
2326 */
2327 static void *bc_malloc(struct rpc_task *task, size_t size)
2328 {
2329 struct page *page;
2330 struct rpc_buffer *buf;
2331
2332 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2333 page = alloc_page(GFP_KERNEL);
2334
2335 if (!page)
2336 return NULL;
2337
2338 buf = page_address(page);
2339 buf->len = PAGE_SIZE;
2340
2341 return buf->data;
2342 }
2343
2344 /*
2345 * Free the space allocated in the bc_alloc routine
2346 */
2347 static void bc_free(void *buffer)
2348 {
2349 struct rpc_buffer *buf;
2350
2351 if (!buffer)
2352 return;
2353
2354 buf = container_of(buffer, struct rpc_buffer, data);
2355 free_page((unsigned long)buf);
2356 }
2357
2358 /*
2359 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2360 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2361 */
2362 static int bc_sendto(struct rpc_rqst *req)
2363 {
2364 int len;
2365 struct xdr_buf *xbufp = &req->rq_snd_buf;
2366 struct rpc_xprt *xprt = req->rq_xprt;
2367 struct sock_xprt *transport =
2368 container_of(xprt, struct sock_xprt, xprt);
2369 struct socket *sock = transport->sock;
2370 unsigned long headoff;
2371 unsigned long tailoff;
2372
2373 xs_encode_stream_record_marker(xbufp);
2374
2375 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2376 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2377 len = svc_send_common(sock, xbufp,
2378 virt_to_page(xbufp->head[0].iov_base), headoff,
2379 xbufp->tail[0].iov_base, tailoff);
2380
2381 if (len != xbufp->len) {
2382 printk(KERN_NOTICE "Error sending entire callback!\n");
2383 len = -EAGAIN;
2384 }
2385
2386 return len;
2387 }
2388
2389 /*
2390 * The send routine. Borrows from svc_send
2391 */
2392 static int bc_send_request(struct rpc_task *task)
2393 {
2394 struct rpc_rqst *req = task->tk_rqstp;
2395 struct svc_xprt *xprt;
2396 struct svc_sock *svsk;
2397 u32 len;
2398
2399 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2400 /*
2401 * Get the server socket associated with this callback xprt
2402 */
2403 xprt = req->rq_xprt->bc_xprt;
2404 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2405
2406 /*
2407 * Grab the mutex to serialize data as the connection is shared
2408 * with the fore channel
2409 */
2410 if (!mutex_trylock(&xprt->xpt_mutex)) {
2411 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2412 if (!mutex_trylock(&xprt->xpt_mutex))
2413 return -EAGAIN;
2414 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2415 }
2416 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2417 len = -ENOTCONN;
2418 else
2419 len = bc_sendto(req);
2420 mutex_unlock(&xprt->xpt_mutex);
2421
2422 if (len > 0)
2423 len = 0;
2424
2425 return len;
2426 }
2427
2428 /*
2429 * The close routine. Since this is client initiated, we do nothing
2430 */
2431
2432 static void bc_close(struct rpc_xprt *xprt)
2433 {
2434 }
2435
2436 /*
2437 * The xprt destroy routine. Again, because this connection is client
2438 * initiated, we do nothing
2439 */
2440
2441 static void bc_destroy(struct rpc_xprt *xprt)
2442 {
2443 }
2444
2445 static struct rpc_xprt_ops xs_local_ops = {
2446 .reserve_xprt = xprt_reserve_xprt,
2447 .release_xprt = xs_tcp_release_xprt,
2448 .alloc_slot = xprt_alloc_slot,
2449 .rpcbind = xs_local_rpcbind,
2450 .set_port = xs_local_set_port,
2451 .connect = xs_connect,
2452 .buf_alloc = rpc_malloc,
2453 .buf_free = rpc_free,
2454 .send_request = xs_local_send_request,
2455 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2456 .close = xs_close,
2457 .destroy = xs_destroy,
2458 .print_stats = xs_local_print_stats,
2459 };
2460
2461 static struct rpc_xprt_ops xs_udp_ops = {
2462 .set_buffer_size = xs_udp_set_buffer_size,
2463 .reserve_xprt = xprt_reserve_xprt_cong,
2464 .release_xprt = xprt_release_xprt_cong,
2465 .alloc_slot = xprt_alloc_slot,
2466 .rpcbind = rpcb_getport_async,
2467 .set_port = xs_set_port,
2468 .connect = xs_connect,
2469 .buf_alloc = rpc_malloc,
2470 .buf_free = rpc_free,
2471 .send_request = xs_udp_send_request,
2472 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2473 .timer = xs_udp_timer,
2474 .release_request = xprt_release_rqst_cong,
2475 .close = xs_close,
2476 .destroy = xs_destroy,
2477 .print_stats = xs_udp_print_stats,
2478 };
2479
2480 static struct rpc_xprt_ops xs_tcp_ops = {
2481 .reserve_xprt = xprt_reserve_xprt,
2482 .release_xprt = xs_tcp_release_xprt,
2483 .alloc_slot = xprt_lock_and_alloc_slot,
2484 .rpcbind = rpcb_getport_async,
2485 .set_port = xs_set_port,
2486 .connect = xs_connect,
2487 .buf_alloc = rpc_malloc,
2488 .buf_free = rpc_free,
2489 .send_request = xs_tcp_send_request,
2490 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2491 .close = xs_tcp_close,
2492 .destroy = xs_destroy,
2493 .print_stats = xs_tcp_print_stats,
2494 };
2495
2496 /*
2497 * The rpc_xprt_ops for the server backchannel
2498 */
2499
2500 static struct rpc_xprt_ops bc_tcp_ops = {
2501 .reserve_xprt = xprt_reserve_xprt,
2502 .release_xprt = xprt_release_xprt,
2503 .alloc_slot = xprt_alloc_slot,
2504 .rpcbind = xs_local_rpcbind,
2505 .buf_alloc = bc_malloc,
2506 .buf_free = bc_free,
2507 .send_request = bc_send_request,
2508 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2509 .close = bc_close,
2510 .destroy = bc_destroy,
2511 .print_stats = xs_tcp_print_stats,
2512 };
2513
2514 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2515 {
2516 static const struct sockaddr_in sin = {
2517 .sin_family = AF_INET,
2518 .sin_addr.s_addr = htonl(INADDR_ANY),
2519 };
2520 static const struct sockaddr_in6 sin6 = {
2521 .sin6_family = AF_INET6,
2522 .sin6_addr = IN6ADDR_ANY_INIT,
2523 };
2524
2525 switch (family) {
2526 case AF_LOCAL:
2527 break;
2528 case AF_INET:
2529 memcpy(sap, &sin, sizeof(sin));
2530 break;
2531 case AF_INET6:
2532 memcpy(sap, &sin6, sizeof(sin6));
2533 break;
2534 default:
2535 dprintk("RPC: %s: Bad address family\n", __func__);
2536 return -EAFNOSUPPORT;
2537 }
2538 return 0;
2539 }
2540
2541 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2542 unsigned int slot_table_size,
2543 unsigned int max_slot_table_size)
2544 {
2545 struct rpc_xprt *xprt;
2546 struct sock_xprt *new;
2547
2548 if (args->addrlen > sizeof(xprt->addr)) {
2549 dprintk("RPC: xs_setup_xprt: address too large\n");
2550 return ERR_PTR(-EBADF);
2551 }
2552
2553 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2554 max_slot_table_size);
2555 if (xprt == NULL) {
2556 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2557 "rpc_xprt\n");
2558 return ERR_PTR(-ENOMEM);
2559 }
2560
2561 new = container_of(xprt, struct sock_xprt, xprt);
2562 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2563 xprt->addrlen = args->addrlen;
2564 if (args->srcaddr)
2565 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2566 else {
2567 int err;
2568 err = xs_init_anyaddr(args->dstaddr->sa_family,
2569 (struct sockaddr *)&new->srcaddr);
2570 if (err != 0) {
2571 xprt_free(xprt);
2572 return ERR_PTR(err);
2573 }
2574 }
2575
2576 return xprt;
2577 }
2578
2579 static const struct rpc_timeout xs_local_default_timeout = {
2580 .to_initval = 10 * HZ,
2581 .to_maxval = 10 * HZ,
2582 .to_retries = 2,
2583 };
2584
2585 /**
2586 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2587 * @args: rpc transport creation arguments
2588 *
2589 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2590 */
2591 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2592 {
2593 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2594 struct sock_xprt *transport;
2595 struct rpc_xprt *xprt;
2596 struct rpc_xprt *ret;
2597
2598 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2599 xprt_max_tcp_slot_table_entries);
2600 if (IS_ERR(xprt))
2601 return xprt;
2602 transport = container_of(xprt, struct sock_xprt, xprt);
2603
2604 xprt->prot = 0;
2605 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2606 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2607
2608 xprt->bind_timeout = XS_BIND_TO;
2609 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2610 xprt->idle_timeout = XS_IDLE_DISC_TO;
2611
2612 xprt->ops = &xs_local_ops;
2613 xprt->timeout = &xs_local_default_timeout;
2614
2615 switch (sun->sun_family) {
2616 case AF_LOCAL:
2617 if (sun->sun_path[0] != '/') {
2618 dprintk("RPC: bad AF_LOCAL address: %s\n",
2619 sun->sun_path);
2620 ret = ERR_PTR(-EINVAL);
2621 goto out_err;
2622 }
2623 xprt_set_bound(xprt);
2624 INIT_DELAYED_WORK(&transport->connect_worker,
2625 xs_local_setup_socket);
2626 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2627 break;
2628 default:
2629 ret = ERR_PTR(-EAFNOSUPPORT);
2630 goto out_err;
2631 }
2632
2633 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2634 xprt->address_strings[RPC_DISPLAY_ADDR]);
2635
2636 if (try_module_get(THIS_MODULE))
2637 return xprt;
2638 ret = ERR_PTR(-EINVAL);
2639 out_err:
2640 xprt_free(xprt);
2641 return ret;
2642 }
2643
2644 static const struct rpc_timeout xs_udp_default_timeout = {
2645 .to_initval = 5 * HZ,
2646 .to_maxval = 30 * HZ,
2647 .to_increment = 5 * HZ,
2648 .to_retries = 5,
2649 };
2650
2651 /**
2652 * xs_setup_udp - Set up transport to use a UDP socket
2653 * @args: rpc transport creation arguments
2654 *
2655 */
2656 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2657 {
2658 struct sockaddr *addr = args->dstaddr;
2659 struct rpc_xprt *xprt;
2660 struct sock_xprt *transport;
2661 struct rpc_xprt *ret;
2662
2663 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2664 xprt_udp_slot_table_entries);
2665 if (IS_ERR(xprt))
2666 return xprt;
2667 transport = container_of(xprt, struct sock_xprt, xprt);
2668
2669 xprt->prot = IPPROTO_UDP;
2670 xprt->tsh_size = 0;
2671 /* XXX: header size can vary due to auth type, IPv6, etc. */
2672 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2673
2674 xprt->bind_timeout = XS_BIND_TO;
2675 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2676 xprt->idle_timeout = XS_IDLE_DISC_TO;
2677
2678 xprt->ops = &xs_udp_ops;
2679
2680 xprt->timeout = &xs_udp_default_timeout;
2681
2682 switch (addr->sa_family) {
2683 case AF_INET:
2684 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2685 xprt_set_bound(xprt);
2686
2687 INIT_DELAYED_WORK(&transport->connect_worker,
2688 xs_udp_setup_socket);
2689 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2690 break;
2691 case AF_INET6:
2692 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2693 xprt_set_bound(xprt);
2694
2695 INIT_DELAYED_WORK(&transport->connect_worker,
2696 xs_udp_setup_socket);
2697 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2698 break;
2699 default:
2700 ret = ERR_PTR(-EAFNOSUPPORT);
2701 goto out_err;
2702 }
2703
2704 if (xprt_bound(xprt))
2705 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2706 xprt->address_strings[RPC_DISPLAY_ADDR],
2707 xprt->address_strings[RPC_DISPLAY_PORT],
2708 xprt->address_strings[RPC_DISPLAY_PROTO]);
2709 else
2710 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2711 xprt->address_strings[RPC_DISPLAY_ADDR],
2712 xprt->address_strings[RPC_DISPLAY_PROTO]);
2713
2714 if (try_module_get(THIS_MODULE))
2715 return xprt;
2716 ret = ERR_PTR(-EINVAL);
2717 out_err:
2718 xprt_free(xprt);
2719 return ret;
2720 }
2721
2722 static const struct rpc_timeout xs_tcp_default_timeout = {
2723 .to_initval = 60 * HZ,
2724 .to_maxval = 60 * HZ,
2725 .to_retries = 2,
2726 };
2727
2728 /**
2729 * xs_setup_tcp - Set up transport to use a TCP socket
2730 * @args: rpc transport creation arguments
2731 *
2732 */
2733 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2734 {
2735 struct sockaddr *addr = args->dstaddr;
2736 struct rpc_xprt *xprt;
2737 struct sock_xprt *transport;
2738 struct rpc_xprt *ret;
2739
2740 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2741 xprt_max_tcp_slot_table_entries);
2742 if (IS_ERR(xprt))
2743 return xprt;
2744 transport = container_of(xprt, struct sock_xprt, xprt);
2745
2746 xprt->prot = IPPROTO_TCP;
2747 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2748 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2749
2750 xprt->bind_timeout = XS_BIND_TO;
2751 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2752 xprt->idle_timeout = XS_IDLE_DISC_TO;
2753
2754 xprt->ops = &xs_tcp_ops;
2755 xprt->timeout = &xs_tcp_default_timeout;
2756
2757 switch (addr->sa_family) {
2758 case AF_INET:
2759 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2760 xprt_set_bound(xprt);
2761
2762 INIT_DELAYED_WORK(&transport->connect_worker,
2763 xs_tcp_setup_socket);
2764 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2765 break;
2766 case AF_INET6:
2767 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2768 xprt_set_bound(xprt);
2769
2770 INIT_DELAYED_WORK(&transport->connect_worker,
2771 xs_tcp_setup_socket);
2772 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2773 break;
2774 default:
2775 ret = ERR_PTR(-EAFNOSUPPORT);
2776 goto out_err;
2777 }
2778
2779 if (xprt_bound(xprt))
2780 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2781 xprt->address_strings[RPC_DISPLAY_ADDR],
2782 xprt->address_strings[RPC_DISPLAY_PORT],
2783 xprt->address_strings[RPC_DISPLAY_PROTO]);
2784 else
2785 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2786 xprt->address_strings[RPC_DISPLAY_ADDR],
2787 xprt->address_strings[RPC_DISPLAY_PROTO]);
2788
2789
2790 if (try_module_get(THIS_MODULE))
2791 return xprt;
2792 ret = ERR_PTR(-EINVAL);
2793 out_err:
2794 xprt_free(xprt);
2795 return ret;
2796 }
2797
2798 /**
2799 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2800 * @args: rpc transport creation arguments
2801 *
2802 */
2803 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2804 {
2805 struct sockaddr *addr = args->dstaddr;
2806 struct rpc_xprt *xprt;
2807 struct sock_xprt *transport;
2808 struct svc_sock *bc_sock;
2809 struct rpc_xprt *ret;
2810
2811 if (args->bc_xprt->xpt_bc_xprt) {
2812 /*
2813 * This server connection already has a backchannel
2814 * export; we can't create a new one, as we wouldn't be
2815 * able to match replies based on xid any more. So,
2816 * reuse the already-existing one:
2817 */
2818 return args->bc_xprt->xpt_bc_xprt;
2819 }
2820 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2821 xprt_tcp_slot_table_entries);
2822 if (IS_ERR(xprt))
2823 return xprt;
2824 transport = container_of(xprt, struct sock_xprt, xprt);
2825
2826 xprt->prot = IPPROTO_TCP;
2827 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2828 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2829 xprt->timeout = &xs_tcp_default_timeout;
2830
2831 /* backchannel */
2832 xprt_set_bound(xprt);
2833 xprt->bind_timeout = 0;
2834 xprt->reestablish_timeout = 0;
2835 xprt->idle_timeout = 0;
2836
2837 xprt->ops = &bc_tcp_ops;
2838
2839 switch (addr->sa_family) {
2840 case AF_INET:
2841 xs_format_peer_addresses(xprt, "tcp",
2842 RPCBIND_NETID_TCP);
2843 break;
2844 case AF_INET6:
2845 xs_format_peer_addresses(xprt, "tcp",
2846 RPCBIND_NETID_TCP6);
2847 break;
2848 default:
2849 ret = ERR_PTR(-EAFNOSUPPORT);
2850 goto out_err;
2851 }
2852
2853 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2854 xprt->address_strings[RPC_DISPLAY_ADDR],
2855 xprt->address_strings[RPC_DISPLAY_PORT],
2856 xprt->address_strings[RPC_DISPLAY_PROTO]);
2857
2858 /*
2859 * Once we've associated a backchannel xprt with a connection,
2860 * we want to keep it around as long as long as the connection
2861 * lasts, in case we need to start using it for a backchannel
2862 * again; this reference won't be dropped until bc_xprt is
2863 * destroyed.
2864 */
2865 xprt_get(xprt);
2866 args->bc_xprt->xpt_bc_xprt = xprt;
2867 xprt->bc_xprt = args->bc_xprt;
2868 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2869 transport->sock = bc_sock->sk_sock;
2870 transport->inet = bc_sock->sk_sk;
2871
2872 /*
2873 * Since we don't want connections for the backchannel, we set
2874 * the xprt status to connected
2875 */
2876 xprt_set_connected(xprt);
2877
2878
2879 if (try_module_get(THIS_MODULE))
2880 return xprt;
2881 xprt_put(xprt);
2882 ret = ERR_PTR(-EINVAL);
2883 out_err:
2884 xprt_free(xprt);
2885 return ret;
2886 }
2887
2888 static struct xprt_class xs_local_transport = {
2889 .list = LIST_HEAD_INIT(xs_local_transport.list),
2890 .name = "named UNIX socket",
2891 .owner = THIS_MODULE,
2892 .ident = XPRT_TRANSPORT_LOCAL,
2893 .setup = xs_setup_local,
2894 };
2895
2896 static struct xprt_class xs_udp_transport = {
2897 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2898 .name = "udp",
2899 .owner = THIS_MODULE,
2900 .ident = XPRT_TRANSPORT_UDP,
2901 .setup = xs_setup_udp,
2902 };
2903
2904 static struct xprt_class xs_tcp_transport = {
2905 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2906 .name = "tcp",
2907 .owner = THIS_MODULE,
2908 .ident = XPRT_TRANSPORT_TCP,
2909 .setup = xs_setup_tcp,
2910 };
2911
2912 static struct xprt_class xs_bc_tcp_transport = {
2913 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2914 .name = "tcp NFSv4.1 backchannel",
2915 .owner = THIS_MODULE,
2916 .ident = XPRT_TRANSPORT_BC_TCP,
2917 .setup = xs_setup_bc_tcp,
2918 };
2919
2920 /**
2921 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2922 *
2923 */
2924 int init_socket_xprt(void)
2925 {
2926 #ifdef RPC_DEBUG
2927 if (!sunrpc_table_header)
2928 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2929 #endif
2930
2931 xprt_register_transport(&xs_local_transport);
2932 xprt_register_transport(&xs_udp_transport);
2933 xprt_register_transport(&xs_tcp_transport);
2934 xprt_register_transport(&xs_bc_tcp_transport);
2935
2936 return 0;
2937 }
2938
2939 /**
2940 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2941 *
2942 */
2943 void cleanup_socket_xprt(void)
2944 {
2945 #ifdef RPC_DEBUG
2946 if (sunrpc_table_header) {
2947 unregister_sysctl_table(sunrpc_table_header);
2948 sunrpc_table_header = NULL;
2949 }
2950 #endif
2951
2952 xprt_unregister_transport(&xs_local_transport);
2953 xprt_unregister_transport(&xs_udp_transport);
2954 xprt_unregister_transport(&xs_tcp_transport);
2955 xprt_unregister_transport(&xs_bc_tcp_transport);
2956 }
2957
2958 static int param_set_uint_minmax(const char *val,
2959 const struct kernel_param *kp,
2960 unsigned int min, unsigned int max)
2961 {
2962 unsigned long num;
2963 int ret;
2964
2965 if (!val)
2966 return -EINVAL;
2967 ret = strict_strtoul(val, 0, &num);
2968 if (ret == -EINVAL || num < min || num > max)
2969 return -EINVAL;
2970 *((unsigned int *)kp->arg) = num;
2971 return 0;
2972 }
2973
2974 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2975 {
2976 return param_set_uint_minmax(val, kp,
2977 RPC_MIN_RESVPORT,
2978 RPC_MAX_RESVPORT);
2979 }
2980
2981 static struct kernel_param_ops param_ops_portnr = {
2982 .set = param_set_portnr,
2983 .get = param_get_uint,
2984 };
2985
2986 #define param_check_portnr(name, p) \
2987 __param_check(name, p, unsigned int);
2988
2989 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2990 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2991
2992 static int param_set_slot_table_size(const char *val,
2993 const struct kernel_param *kp)
2994 {
2995 return param_set_uint_minmax(val, kp,
2996 RPC_MIN_SLOT_TABLE,
2997 RPC_MAX_SLOT_TABLE);
2998 }
2999
3000 static struct kernel_param_ops param_ops_slot_table_size = {
3001 .set = param_set_slot_table_size,
3002 .get = param_get_uint,
3003 };
3004
3005 #define param_check_slot_table_size(name, p) \
3006 __param_check(name, p, unsigned int);
3007
3008 static int param_set_max_slot_table_size(const char *val,
3009 const struct kernel_param *kp)
3010 {
3011 return param_set_uint_minmax(val, kp,
3012 RPC_MIN_SLOT_TABLE,
3013 RPC_MAX_SLOT_TABLE_LIMIT);
3014 }
3015
3016 static struct kernel_param_ops param_ops_max_slot_table_size = {
3017 .set = param_set_max_slot_table_size,
3018 .get = param_get_uint,
3019 };
3020
3021 #define param_check_max_slot_table_size(name, p) \
3022 __param_check(name, p, unsigned int);
3023
3024 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3025 slot_table_size, 0644);
3026 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3027 max_slot_table_size, 0644);
3028 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3029 slot_table_size, 0644);
3030
Linux with added FPC-III support