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davinci: add spi devices support for da850/omap-l138/am18x evm
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / xprtsock.c
blobc431f5a579605bfa5ea33161ff45188ab4bd570d
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/svcsock.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/file.h>
38 #ifdef CONFIG_NFS_V4_1
39 #include <linux/sunrpc/bc_xprt.h>
40 #endif
41
42 #include <net/sock.h>
43 #include <net/checksum.h>
44 #include <net/udp.h>
45 #include <net/tcp.h>
46
47 #include "sunrpc.h"
48 /*
49 * xprtsock tunables
50 */
51 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
52 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
53
54 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
55 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
56
57 #define XS_TCP_LINGER_TO (15U * HZ)
58 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
59
60 /*
61 * We can register our own files under /proc/sys/sunrpc by
62 * calling register_sysctl_table() again. The files in that
63 * directory become the union of all files registered there.
64 *
65 * We simply need to make sure that we don't collide with
66 * someone else's file names!
67 */
68
69 #ifdef RPC_DEBUG
70
71 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
72 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
73 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
74 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
75
76 static struct ctl_table_header *sunrpc_table_header;
77
78 /*
79 * FIXME: changing the UDP slot table size should also resize the UDP
80 * socket buffers for existing UDP transports
81 */
82 static ctl_table xs_tunables_table[] = {
83 {
84 .procname = "udp_slot_table_entries",
85 .data = &xprt_udp_slot_table_entries,
86 .maxlen = sizeof(unsigned int),
87 .mode = 0644,
88 .proc_handler = proc_dointvec_minmax,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
91 },
92 {
93 .procname = "tcp_slot_table_entries",
94 .data = &xprt_tcp_slot_table_entries,
95 .maxlen = sizeof(unsigned int),
96 .mode = 0644,
97 .proc_handler = proc_dointvec_minmax,
98 .extra1 = &min_slot_table_size,
99 .extra2 = &max_slot_table_size
100 },
101 {
102 .procname = "min_resvport",
103 .data = &xprt_min_resvport,
104 .maxlen = sizeof(unsigned int),
105 .mode = 0644,
106 .proc_handler = proc_dointvec_minmax,
107 .extra1 = &xprt_min_resvport_limit,
108 .extra2 = &xprt_max_resvport_limit
109 },
110 {
111 .procname = "max_resvport",
112 .data = &xprt_max_resvport,
113 .maxlen = sizeof(unsigned int),
114 .mode = 0644,
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .procname = "tcp_fin_timeout",
121 .data = &xs_tcp_fin_timeout,
122 .maxlen = sizeof(xs_tcp_fin_timeout),
123 .mode = 0644,
124 .proc_handler = proc_dointvec_jiffies,
125 },
126 { },
127 };
128
129 static ctl_table sunrpc_table[] = {
130 {
131 .procname = "sunrpc",
132 .mode = 0555,
133 .child = xs_tunables_table
134 },
135 { },
136 };
137
138 #endif
139
140 /*
141 * Wait duration for a reply from the RPC portmapper.
142 */
143 #define XS_BIND_TO (60U * HZ)
144
145 /*
146 * Delay if a UDP socket connect error occurs. This is most likely some
147 * kind of resource problem on the local host.
148 */
149 #define XS_UDP_REEST_TO (2U * HZ)
150
151 /*
152 * The reestablish timeout allows clients to delay for a bit before attempting
153 * to reconnect to a server that just dropped our connection.
154 *
155 * We implement an exponential backoff when trying to reestablish a TCP
156 * transport connection with the server. Some servers like to drop a TCP
157 * connection when they are overworked, so we start with a short timeout and
158 * increase over time if the server is down or not responding.
159 */
160 #define XS_TCP_INIT_REEST_TO (3U * HZ)
161 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
162
163 /*
164 * TCP idle timeout; client drops the transport socket if it is idle
165 * for this long. Note that we also timeout UDP sockets to prevent
166 * holding port numbers when there is no RPC traffic.
167 */
168 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
169
170 #ifdef RPC_DEBUG
171 # undef RPC_DEBUG_DATA
172 # define RPCDBG_FACILITY RPCDBG_TRANS
173 #endif
174
175 #ifdef RPC_DEBUG_DATA
176 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
177 {
178 u8 *buf = (u8 *) packet;
179 int j;
180
181 dprintk("RPC: %s\n", msg);
182 for (j = 0; j < count && j < 128; j += 4) {
183 if (!(j & 31)) {
184 if (j)
185 dprintk("\n");
186 dprintk("0x%04x ", j);
187 }
188 dprintk("%02x%02x%02x%02x ",
189 buf[j], buf[j+1], buf[j+2], buf[j+3]);
190 }
191 dprintk("\n");
192 }
193 #else
194 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
195 {
196 /* NOP */
197 }
198 #endif
199
200 struct sock_xprt {
201 struct rpc_xprt xprt;
202
203 /*
204 * Network layer
205 */
206 struct socket * sock;
207 struct sock * inet;
208
209 /*
210 * State of TCP reply receive
211 */
212 __be32 tcp_fraghdr,
213 tcp_xid,
214 tcp_calldir;
215
216 u32 tcp_offset,
217 tcp_reclen;
218
219 unsigned long tcp_copied,
220 tcp_flags;
221
222 /*
223 * Connection of transports
224 */
225 struct delayed_work connect_worker;
226 struct sockaddr_storage srcaddr;
227 unsigned short srcport;
228
229 /*
230 * UDP socket buffer size parameters
231 */
232 size_t rcvsize,
233 sndsize;
234
235 /*
236 * Saved socket callback addresses
237 */
238 void (*old_data_ready)(struct sock *, int);
239 void (*old_state_change)(struct sock *);
240 void (*old_write_space)(struct sock *);
241 void (*old_error_report)(struct sock *);
242 };
243
244 /*
245 * TCP receive state flags
246 */
247 #define TCP_RCV_LAST_FRAG (1UL << 0)
248 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
249 #define TCP_RCV_COPY_XID (1UL << 2)
250 #define TCP_RCV_COPY_DATA (1UL << 3)
251 #define TCP_RCV_READ_CALLDIR (1UL << 4)
252 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
253
254 /*
255 * TCP RPC flags
256 */
257 #define TCP_RPC_REPLY (1UL << 6)
258
259 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
260 {
261 return (struct sockaddr *) &xprt->addr;
262 }
263
264 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
265 {
266 return (struct sockaddr_in *) &xprt->addr;
267 }
268
269 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
270 {
271 return (struct sockaddr_in6 *) &xprt->addr;
272 }
273
274 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
275 {
276 struct sockaddr *sap = xs_addr(xprt);
277 struct sockaddr_in6 *sin6;
278 struct sockaddr_in *sin;
279 char buf[128];
280
281 (void)rpc_ntop(sap, buf, sizeof(buf));
282 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
283
284 switch (sap->sa_family) {
285 case AF_INET:
286 sin = xs_addr_in(xprt);
287 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
288 break;
289 case AF_INET6:
290 sin6 = xs_addr_in6(xprt);
291 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
292 break;
293 default:
294 BUG();
295 }
296 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
297 }
298
299 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
300 {
301 struct sockaddr *sap = xs_addr(xprt);
302 char buf[128];
303
304 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
305 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
306
307 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
308 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
309 }
310
311 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
312 const char *protocol,
313 const char *netid)
314 {
315 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
316 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
317 xs_format_common_peer_addresses(xprt);
318 xs_format_common_peer_ports(xprt);
319 }
320
321 static void xs_update_peer_port(struct rpc_xprt *xprt)
322 {
323 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
324 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
325
326 xs_format_common_peer_ports(xprt);
327 }
328
329 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
330 {
331 unsigned int i;
332
333 for (i = 0; i < RPC_DISPLAY_MAX; i++)
334 switch (i) {
335 case RPC_DISPLAY_PROTO:
336 case RPC_DISPLAY_NETID:
337 continue;
338 default:
339 kfree(xprt->address_strings[i]);
340 }
341 }
342
343 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
344
345 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
346 {
347 struct msghdr msg = {
348 .msg_name = addr,
349 .msg_namelen = addrlen,
350 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
351 };
352 struct kvec iov = {
353 .iov_base = vec->iov_base + base,
354 .iov_len = vec->iov_len - base,
355 };
356
357 if (iov.iov_len != 0)
358 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
359 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
360 }
361
362 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
363 {
364 struct page **ppage;
365 unsigned int remainder;
366 int err, sent = 0;
367
368 remainder = xdr->page_len - base;
369 base += xdr->page_base;
370 ppage = xdr->pages + (base >> PAGE_SHIFT);
371 base &= ~PAGE_MASK;
372 for(;;) {
373 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
374 int flags = XS_SENDMSG_FLAGS;
375
376 remainder -= len;
377 if (remainder != 0 || more)
378 flags |= MSG_MORE;
379 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
380 if (remainder == 0 || err != len)
381 break;
382 sent += err;
383 ppage++;
384 base = 0;
385 }
386 if (sent == 0)
387 return err;
388 if (err > 0)
389 sent += err;
390 return sent;
391 }
392
393 /**
394 * xs_sendpages - write pages directly to a socket
395 * @sock: socket to send on
396 * @addr: UDP only -- address of destination
397 * @addrlen: UDP only -- length of destination address
398 * @xdr: buffer containing this request
399 * @base: starting position in the buffer
400 *
401 */
402 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
403 {
404 unsigned int remainder = xdr->len - base;
405 int err, sent = 0;
406
407 if (unlikely(!sock))
408 return -ENOTSOCK;
409
410 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
411 if (base != 0) {
412 addr = NULL;
413 addrlen = 0;
414 }
415
416 if (base < xdr->head[0].iov_len || addr != NULL) {
417 unsigned int len = xdr->head[0].iov_len - base;
418 remainder -= len;
419 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
420 if (remainder == 0 || err != len)
421 goto out;
422 sent += err;
423 base = 0;
424 } else
425 base -= xdr->head[0].iov_len;
426
427 if (base < xdr->page_len) {
428 unsigned int len = xdr->page_len - base;
429 remainder -= len;
430 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
431 if (remainder == 0 || err != len)
432 goto out;
433 sent += err;
434 base = 0;
435 } else
436 base -= xdr->page_len;
437
438 if (base >= xdr->tail[0].iov_len)
439 return sent;
440 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
441 out:
442 if (sent == 0)
443 return err;
444 if (err > 0)
445 sent += err;
446 return sent;
447 }
448
449 static void xs_nospace_callback(struct rpc_task *task)
450 {
451 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
452
453 transport->inet->sk_write_pending--;
454 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
455 }
456
457 /**
458 * xs_nospace - place task on wait queue if transmit was incomplete
459 * @task: task to put to sleep
460 *
461 */
462 static int xs_nospace(struct rpc_task *task)
463 {
464 struct rpc_rqst *req = task->tk_rqstp;
465 struct rpc_xprt *xprt = req->rq_xprt;
466 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
467 int ret = 0;
468
469 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
470 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
471 req->rq_slen);
472
473 /* Protect against races with write_space */
474 spin_lock_bh(&xprt->transport_lock);
475
476 /* Don't race with disconnect */
477 if (xprt_connected(xprt)) {
478 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
479 ret = -EAGAIN;
480 /*
481 * Notify TCP that we're limited by the application
482 * window size
483 */
484 set_bit(SOCK_NOSPACE, &transport->sock->flags);
485 transport->inet->sk_write_pending++;
486 /* ...and wait for more buffer space */
487 xprt_wait_for_buffer_space(task, xs_nospace_callback);
488 }
489 } else {
490 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
491 ret = -ENOTCONN;
492 }
493
494 spin_unlock_bh(&xprt->transport_lock);
495 return ret;
496 }
497
498 /**
499 * xs_udp_send_request - write an RPC request to a UDP socket
500 * @task: address of RPC task that manages the state of an RPC request
501 *
502 * Return values:
503 * 0: The request has been sent
504 * EAGAIN: The socket was blocked, please call again later to
505 * complete the request
506 * ENOTCONN: Caller needs to invoke connect logic then call again
507 * other: Some other error occured, the request was not sent
508 */
509 static int xs_udp_send_request(struct rpc_task *task)
510 {
511 struct rpc_rqst *req = task->tk_rqstp;
512 struct rpc_xprt *xprt = req->rq_xprt;
513 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
514 struct xdr_buf *xdr = &req->rq_snd_buf;
515 int status;
516
517 xs_pktdump("packet data:",
518 req->rq_svec->iov_base,
519 req->rq_svec->iov_len);
520
521 if (!xprt_bound(xprt))
522 return -ENOTCONN;
523 status = xs_sendpages(transport->sock,
524 xs_addr(xprt),
525 xprt->addrlen, xdr,
526 req->rq_bytes_sent);
527
528 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
529 xdr->len - req->rq_bytes_sent, status);
530
531 if (status >= 0) {
532 req->rq_xmit_bytes_sent += status;
533 if (status >= req->rq_slen)
534 return 0;
535 /* Still some bytes left; set up for a retry later. */
536 status = -EAGAIN;
537 }
538
539 switch (status) {
540 case -ENOTSOCK:
541 status = -ENOTCONN;
542 /* Should we call xs_close() here? */
543 break;
544 case -EAGAIN:
545 status = xs_nospace(task);
546 break;
547 default:
548 dprintk("RPC: sendmsg returned unrecognized error %d\n",
549 -status);
550 case -ENETUNREACH:
551 case -EPIPE:
552 case -ECONNREFUSED:
553 /* When the server has died, an ICMP port unreachable message
554 * prompts ECONNREFUSED. */
555 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
556 }
557
558 return status;
559 }
560
561 /**
562 * xs_tcp_shutdown - gracefully shut down a TCP socket
563 * @xprt: transport
564 *
565 * Initiates a graceful shutdown of the TCP socket by calling the
566 * equivalent of shutdown(SHUT_WR);
567 */
568 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
569 {
570 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
571 struct socket *sock = transport->sock;
572
573 if (sock != NULL)
574 kernel_sock_shutdown(sock, SHUT_WR);
575 }
576
577 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
578 {
579 u32 reclen = buf->len - sizeof(rpc_fraghdr);
580 rpc_fraghdr *base = buf->head[0].iov_base;
581 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
582 }
583
584 /**
585 * xs_tcp_send_request - write an RPC request to a TCP socket
586 * @task: address of RPC task that manages the state of an RPC request
587 *
588 * Return values:
589 * 0: The request has been sent
590 * EAGAIN: The socket was blocked, please call again later to
591 * complete the request
592 * ENOTCONN: Caller needs to invoke connect logic then call again
593 * other: Some other error occured, the request was not sent
594 *
595 * XXX: In the case of soft timeouts, should we eventually give up
596 * if sendmsg is not able to make progress?
597 */
598 static int xs_tcp_send_request(struct rpc_task *task)
599 {
600 struct rpc_rqst *req = task->tk_rqstp;
601 struct rpc_xprt *xprt = req->rq_xprt;
602 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
603 struct xdr_buf *xdr = &req->rq_snd_buf;
604 int status;
605
606 xs_encode_tcp_record_marker(&req->rq_snd_buf);
607
608 xs_pktdump("packet data:",
609 req->rq_svec->iov_base,
610 req->rq_svec->iov_len);
611
612 /* Continue transmitting the packet/record. We must be careful
613 * to cope with writespace callbacks arriving _after_ we have
614 * called sendmsg(). */
615 while (1) {
616 status = xs_sendpages(transport->sock,
617 NULL, 0, xdr, req->rq_bytes_sent);
618
619 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
620 xdr->len - req->rq_bytes_sent, status);
621
622 if (unlikely(status < 0))
623 break;
624
625 /* If we've sent the entire packet, immediately
626 * reset the count of bytes sent. */
627 req->rq_bytes_sent += status;
628 req->rq_xmit_bytes_sent += status;
629 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
630 req->rq_bytes_sent = 0;
631 return 0;
632 }
633
634 if (status != 0)
635 continue;
636 status = -EAGAIN;
637 break;
638 }
639
640 switch (status) {
641 case -ENOTSOCK:
642 status = -ENOTCONN;
643 /* Should we call xs_close() here? */
644 break;
645 case -EAGAIN:
646 status = xs_nospace(task);
647 break;
648 default:
649 dprintk("RPC: sendmsg returned unrecognized error %d\n",
650 -status);
651 case -ECONNRESET:
652 case -EPIPE:
653 xs_tcp_shutdown(xprt);
654 case -ECONNREFUSED:
655 case -ENOTCONN:
656 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
657 }
658
659 return status;
660 }
661
662 /**
663 * xs_tcp_release_xprt - clean up after a tcp transmission
664 * @xprt: transport
665 * @task: rpc task
666 *
667 * This cleans up if an error causes us to abort the transmission of a request.
668 * In this case, the socket may need to be reset in order to avoid confusing
669 * the server.
670 */
671 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
672 {
673 struct rpc_rqst *req;
674
675 if (task != xprt->snd_task)
676 return;
677 if (task == NULL)
678 goto out_release;
679 req = task->tk_rqstp;
680 if (req->rq_bytes_sent == 0)
681 goto out_release;
682 if (req->rq_bytes_sent == req->rq_snd_buf.len)
683 goto out_release;
684 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
685 out_release:
686 xprt_release_xprt(xprt, task);
687 }
688
689 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
690 {
691 transport->old_data_ready = sk->sk_data_ready;
692 transport->old_state_change = sk->sk_state_change;
693 transport->old_write_space = sk->sk_write_space;
694 transport->old_error_report = sk->sk_error_report;
695 }
696
697 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
698 {
699 sk->sk_data_ready = transport->old_data_ready;
700 sk->sk_state_change = transport->old_state_change;
701 sk->sk_write_space = transport->old_write_space;
702 sk->sk_error_report = transport->old_error_report;
703 }
704
705 static void xs_reset_transport(struct sock_xprt *transport)
706 {
707 struct socket *sock = transport->sock;
708 struct sock *sk = transport->inet;
709
710 if (sk == NULL)
711 return;
712
713 write_lock_bh(&sk->sk_callback_lock);
714 transport->inet = NULL;
715 transport->sock = NULL;
716
717 sk->sk_user_data = NULL;
718
719 xs_restore_old_callbacks(transport, sk);
720 write_unlock_bh(&sk->sk_callback_lock);
721
722 sk->sk_no_check = 0;
723
724 sock_release(sock);
725 }
726
727 /**
728 * xs_close - close a socket
729 * @xprt: transport
730 *
731 * This is used when all requests are complete; ie, no DRC state remains
732 * on the server we want to save.
733 *
734 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
735 * xs_reset_transport() zeroing the socket from underneath a writer.
736 */
737 static void xs_close(struct rpc_xprt *xprt)
738 {
739 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
740
741 dprintk("RPC: xs_close xprt %p\n", xprt);
742
743 xs_reset_transport(transport);
744 xprt->reestablish_timeout = 0;
745
746 smp_mb__before_clear_bit();
747 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
748 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
749 clear_bit(XPRT_CLOSING, &xprt->state);
750 smp_mb__after_clear_bit();
751 xprt_disconnect_done(xprt);
752 }
753
754 static void xs_tcp_close(struct rpc_xprt *xprt)
755 {
756 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
757 xs_close(xprt);
758 else
759 xs_tcp_shutdown(xprt);
760 }
761
762 /**
763 * xs_destroy - prepare to shutdown a transport
764 * @xprt: doomed transport
765 *
766 */
767 static void xs_destroy(struct rpc_xprt *xprt)
768 {
769 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
770
771 dprintk("RPC: xs_destroy xprt %p\n", xprt);
772
773 cancel_delayed_work_sync(&transport->connect_worker);
774
775 xs_close(xprt);
776 xs_free_peer_addresses(xprt);
777 xprt_free(xprt);
778 module_put(THIS_MODULE);
779 }
780
781 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
782 {
783 return (struct rpc_xprt *) sk->sk_user_data;
784 }
785
786 /**
787 * xs_udp_data_ready - "data ready" callback for UDP sockets
788 * @sk: socket with data to read
789 * @len: how much data to read
790 *
791 */
792 static void xs_udp_data_ready(struct sock *sk, int len)
793 {
794 struct rpc_task *task;
795 struct rpc_xprt *xprt;
796 struct rpc_rqst *rovr;
797 struct sk_buff *skb;
798 int err, repsize, copied;
799 u32 _xid;
800 __be32 *xp;
801
802 read_lock_bh(&sk->sk_callback_lock);
803 dprintk("RPC: xs_udp_data_ready...\n");
804 if (!(xprt = xprt_from_sock(sk)))
805 goto out;
806
807 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
808 goto out;
809
810 if (xprt->shutdown)
811 goto dropit;
812
813 repsize = skb->len - sizeof(struct udphdr);
814 if (repsize < 4) {
815 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
816 goto dropit;
817 }
818
819 /* Copy the XID from the skb... */
820 xp = skb_header_pointer(skb, sizeof(struct udphdr),
821 sizeof(_xid), &_xid);
822 if (xp == NULL)
823 goto dropit;
824
825 /* Look up and lock the request corresponding to the given XID */
826 spin_lock(&xprt->transport_lock);
827 rovr = xprt_lookup_rqst(xprt, *xp);
828 if (!rovr)
829 goto out_unlock;
830 task = rovr->rq_task;
831
832 if ((copied = rovr->rq_private_buf.buflen) > repsize)
833 copied = repsize;
834
835 /* Suck it into the iovec, verify checksum if not done by hw. */
836 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
837 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
838 goto out_unlock;
839 }
840
841 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
842
843 /* Something worked... */
844 dst_confirm(skb_dst(skb));
845
846 xprt_adjust_cwnd(task, copied);
847 xprt_complete_rqst(task, copied);
848
849 out_unlock:
850 spin_unlock(&xprt->transport_lock);
851 dropit:
852 skb_free_datagram(sk, skb);
853 out:
854 read_unlock_bh(&sk->sk_callback_lock);
855 }
856
857 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
858 {
859 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
860 size_t len, used;
861 char *p;
862
863 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
864 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
865 used = xdr_skb_read_bits(desc, p, len);
866 transport->tcp_offset += used;
867 if (used != len)
868 return;
869
870 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
871 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
872 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
873 else
874 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
875 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
876
877 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
878 transport->tcp_offset = 0;
879
880 /* Sanity check of the record length */
881 if (unlikely(transport->tcp_reclen < 8)) {
882 dprintk("RPC: invalid TCP record fragment length\n");
883 xprt_force_disconnect(xprt);
884 return;
885 }
886 dprintk("RPC: reading TCP record fragment of length %d\n",
887 transport->tcp_reclen);
888 }
889
890 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
891 {
892 if (transport->tcp_offset == transport->tcp_reclen) {
893 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
894 transport->tcp_offset = 0;
895 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
896 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
897 transport->tcp_flags |= TCP_RCV_COPY_XID;
898 transport->tcp_copied = 0;
899 }
900 }
901 }
902
903 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
904 {
905 size_t len, used;
906 char *p;
907
908 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
909 dprintk("RPC: reading XID (%Zu bytes)\n", len);
910 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
911 used = xdr_skb_read_bits(desc, p, len);
912 transport->tcp_offset += used;
913 if (used != len)
914 return;
915 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
916 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
917 transport->tcp_copied = 4;
918 dprintk("RPC: reading %s XID %08x\n",
919 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
920 : "request with",
921 ntohl(transport->tcp_xid));
922 xs_tcp_check_fraghdr(transport);
923 }
924
925 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
926 struct xdr_skb_reader *desc)
927 {
928 size_t len, used;
929 u32 offset;
930 char *p;
931
932 /*
933 * We want transport->tcp_offset to be 8 at the end of this routine
934 * (4 bytes for the xid and 4 bytes for the call/reply flag).
935 * When this function is called for the first time,
936 * transport->tcp_offset is 4 (after having already read the xid).
937 */
938 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
939 len = sizeof(transport->tcp_calldir) - offset;
940 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
941 p = ((char *) &transport->tcp_calldir) + offset;
942 used = xdr_skb_read_bits(desc, p, len);
943 transport->tcp_offset += used;
944 if (used != len)
945 return;
946 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
947 /*
948 * We don't yet have the XDR buffer, so we will write the calldir
949 * out after we get the buffer from the 'struct rpc_rqst'
950 */
951 switch (ntohl(transport->tcp_calldir)) {
952 case RPC_REPLY:
953 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
954 transport->tcp_flags |= TCP_RCV_COPY_DATA;
955 transport->tcp_flags |= TCP_RPC_REPLY;
956 break;
957 case RPC_CALL:
958 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
959 transport->tcp_flags |= TCP_RCV_COPY_DATA;
960 transport->tcp_flags &= ~TCP_RPC_REPLY;
961 break;
962 default:
963 dprintk("RPC: invalid request message type\n");
964 xprt_force_disconnect(&transport->xprt);
965 }
966 xs_tcp_check_fraghdr(transport);
967 }
968
969 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
970 struct xdr_skb_reader *desc,
971 struct rpc_rqst *req)
972 {
973 struct sock_xprt *transport =
974 container_of(xprt, struct sock_xprt, xprt);
975 struct xdr_buf *rcvbuf;
976 size_t len;
977 ssize_t r;
978
979 rcvbuf = &req->rq_private_buf;
980
981 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
982 /*
983 * Save the RPC direction in the XDR buffer
984 */
985 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
986 &transport->tcp_calldir,
987 sizeof(transport->tcp_calldir));
988 transport->tcp_copied += sizeof(transport->tcp_calldir);
989 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
990 }
991
992 len = desc->count;
993 if (len > transport->tcp_reclen - transport->tcp_offset) {
994 struct xdr_skb_reader my_desc;
995
996 len = transport->tcp_reclen - transport->tcp_offset;
997 memcpy(&my_desc, desc, sizeof(my_desc));
998 my_desc.count = len;
999 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1000 &my_desc, xdr_skb_read_bits);
1001 desc->count -= r;
1002 desc->offset += r;
1003 } else
1004 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1005 desc, xdr_skb_read_bits);
1006
1007 if (r > 0) {
1008 transport->tcp_copied += r;
1009 transport->tcp_offset += r;
1010 }
1011 if (r != len) {
1012 /* Error when copying to the receive buffer,
1013 * usually because we weren't able to allocate
1014 * additional buffer pages. All we can do now
1015 * is turn off TCP_RCV_COPY_DATA, so the request
1016 * will not receive any additional updates,
1017 * and time out.
1018 * Any remaining data from this record will
1019 * be discarded.
1020 */
1021 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1022 dprintk("RPC: XID %08x truncated request\n",
1023 ntohl(transport->tcp_xid));
1024 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1025 "tcp_offset = %u, tcp_reclen = %u\n",
1026 xprt, transport->tcp_copied,
1027 transport->tcp_offset, transport->tcp_reclen);
1028 return;
1029 }
1030
1031 dprintk("RPC: XID %08x read %Zd bytes\n",
1032 ntohl(transport->tcp_xid), r);
1033 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1034 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1035 transport->tcp_offset, transport->tcp_reclen);
1036
1037 if (transport->tcp_copied == req->rq_private_buf.buflen)
1038 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1039 else if (transport->tcp_offset == transport->tcp_reclen) {
1040 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1041 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1042 }
1043 }
1044
1045 /*
1046 * Finds the request corresponding to the RPC xid and invokes the common
1047 * tcp read code to read the data.
1048 */
1049 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1050 struct xdr_skb_reader *desc)
1051 {
1052 struct sock_xprt *transport =
1053 container_of(xprt, struct sock_xprt, xprt);
1054 struct rpc_rqst *req;
1055
1056 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1057
1058 /* Find and lock the request corresponding to this xid */
1059 spin_lock(&xprt->transport_lock);
1060 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1061 if (!req) {
1062 dprintk("RPC: XID %08x request not found!\n",
1063 ntohl(transport->tcp_xid));
1064 spin_unlock(&xprt->transport_lock);
1065 return -1;
1066 }
1067
1068 xs_tcp_read_common(xprt, desc, req);
1069
1070 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1071 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1072
1073 spin_unlock(&xprt->transport_lock);
1074 return 0;
1075 }
1076
1077 #if defined(CONFIG_NFS_V4_1)
1078 /*
1079 * Obtains an rpc_rqst previously allocated and invokes the common
1080 * tcp read code to read the data. The result is placed in the callback
1081 * queue.
1082 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1083 * connection and return -1.
1084 */
1085 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1086 struct xdr_skb_reader *desc)
1087 {
1088 struct sock_xprt *transport =
1089 container_of(xprt, struct sock_xprt, xprt);
1090 struct rpc_rqst *req;
1091
1092 req = xprt_alloc_bc_request(xprt);
1093 if (req == NULL) {
1094 printk(KERN_WARNING "Callback slot table overflowed\n");
1095 xprt_force_disconnect(xprt);
1096 return -1;
1097 }
1098
1099 req->rq_xid = transport->tcp_xid;
1100 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1101 xs_tcp_read_common(xprt, desc, req);
1102
1103 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1104 struct svc_serv *bc_serv = xprt->bc_serv;
1105
1106 /*
1107 * Add callback request to callback list. The callback
1108 * service sleeps on the sv_cb_waitq waiting for new
1109 * requests. Wake it up after adding enqueing the
1110 * request.
1111 */
1112 dprintk("RPC: add callback request to list\n");
1113 spin_lock(&bc_serv->sv_cb_lock);
1114 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1115 spin_unlock(&bc_serv->sv_cb_lock);
1116 wake_up(&bc_serv->sv_cb_waitq);
1117 }
1118
1119 req->rq_private_buf.len = transport->tcp_copied;
1120
1121 return 0;
1122 }
1123
1124 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1125 struct xdr_skb_reader *desc)
1126 {
1127 struct sock_xprt *transport =
1128 container_of(xprt, struct sock_xprt, xprt);
1129
1130 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1131 xs_tcp_read_reply(xprt, desc) :
1132 xs_tcp_read_callback(xprt, desc);
1133 }
1134 #else
1135 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1136 struct xdr_skb_reader *desc)
1137 {
1138 return xs_tcp_read_reply(xprt, desc);
1139 }
1140 #endif /* CONFIG_NFS_V4_1 */
1141
1142 /*
1143 * Read data off the transport. This can be either an RPC_CALL or an
1144 * RPC_REPLY. Relay the processing to helper functions.
1145 */
1146 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1147 struct xdr_skb_reader *desc)
1148 {
1149 struct sock_xprt *transport =
1150 container_of(xprt, struct sock_xprt, xprt);
1151
1152 if (_xs_tcp_read_data(xprt, desc) == 0)
1153 xs_tcp_check_fraghdr(transport);
1154 else {
1155 /*
1156 * The transport_lock protects the request handling.
1157 * There's no need to hold it to update the tcp_flags.
1158 */
1159 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1160 }
1161 }
1162
1163 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1164 {
1165 size_t len;
1166
1167 len = transport->tcp_reclen - transport->tcp_offset;
1168 if (len > desc->count)
1169 len = desc->count;
1170 desc->count -= len;
1171 desc->offset += len;
1172 transport->tcp_offset += len;
1173 dprintk("RPC: discarded %Zu bytes\n", len);
1174 xs_tcp_check_fraghdr(transport);
1175 }
1176
1177 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1178 {
1179 struct rpc_xprt *xprt = rd_desc->arg.data;
1180 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1181 struct xdr_skb_reader desc = {
1182 .skb = skb,
1183 .offset = offset,
1184 .count = len,
1185 };
1186
1187 dprintk("RPC: xs_tcp_data_recv started\n");
1188 do {
1189 /* Read in a new fragment marker if necessary */
1190 /* Can we ever really expect to get completely empty fragments? */
1191 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1192 xs_tcp_read_fraghdr(xprt, &desc);
1193 continue;
1194 }
1195 /* Read in the xid if necessary */
1196 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1197 xs_tcp_read_xid(transport, &desc);
1198 continue;
1199 }
1200 /* Read in the call/reply flag */
1201 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1202 xs_tcp_read_calldir(transport, &desc);
1203 continue;
1204 }
1205 /* Read in the request data */
1206 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1207 xs_tcp_read_data(xprt, &desc);
1208 continue;
1209 }
1210 /* Skip over any trailing bytes on short reads */
1211 xs_tcp_read_discard(transport, &desc);
1212 } while (desc.count);
1213 dprintk("RPC: xs_tcp_data_recv done\n");
1214 return len - desc.count;
1215 }
1216
1217 /**
1218 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1219 * @sk: socket with data to read
1220 * @bytes: how much data to read
1221 *
1222 */
1223 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1224 {
1225 struct rpc_xprt *xprt;
1226 read_descriptor_t rd_desc;
1227 int read;
1228
1229 dprintk("RPC: xs_tcp_data_ready...\n");
1230
1231 read_lock_bh(&sk->sk_callback_lock);
1232 if (!(xprt = xprt_from_sock(sk)))
1233 goto out;
1234 if (xprt->shutdown)
1235 goto out;
1236
1237 /* Any data means we had a useful conversation, so
1238 * the we don't need to delay the next reconnect
1239 */
1240 if (xprt->reestablish_timeout)
1241 xprt->reestablish_timeout = 0;
1242
1243 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1244 rd_desc.arg.data = xprt;
1245 do {
1246 rd_desc.count = 65536;
1247 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1248 } while (read > 0);
1249 out:
1250 read_unlock_bh(&sk->sk_callback_lock);
1251 }
1252
1253 /*
1254 * Do the equivalent of linger/linger2 handling for dealing with
1255 * broken servers that don't close the socket in a timely
1256 * fashion
1257 */
1258 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1259 unsigned long timeout)
1260 {
1261 struct sock_xprt *transport;
1262
1263 if (xprt_test_and_set_connecting(xprt))
1264 return;
1265 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1266 transport = container_of(xprt, struct sock_xprt, xprt);
1267 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1268 timeout);
1269 }
1270
1271 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1272 {
1273 struct sock_xprt *transport;
1274
1275 transport = container_of(xprt, struct sock_xprt, xprt);
1276
1277 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1278 !cancel_delayed_work(&transport->connect_worker))
1279 return;
1280 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1281 xprt_clear_connecting(xprt);
1282 }
1283
1284 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1285 {
1286 smp_mb__before_clear_bit();
1287 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1288 clear_bit(XPRT_CLOSING, &xprt->state);
1289 smp_mb__after_clear_bit();
1290 /* Mark transport as closed and wake up all pending tasks */
1291 xprt_disconnect_done(xprt);
1292 }
1293
1294 /**
1295 * xs_tcp_state_change - callback to handle TCP socket state changes
1296 * @sk: socket whose state has changed
1297 *
1298 */
1299 static void xs_tcp_state_change(struct sock *sk)
1300 {
1301 struct rpc_xprt *xprt;
1302
1303 read_lock_bh(&sk->sk_callback_lock);
1304 if (!(xprt = xprt_from_sock(sk)))
1305 goto out;
1306 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1307 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1308 sk->sk_state, xprt_connected(xprt),
1309 sock_flag(sk, SOCK_DEAD),
1310 sock_flag(sk, SOCK_ZAPPED),
1311 sk->sk_shutdown);
1312
1313 switch (sk->sk_state) {
1314 case TCP_ESTABLISHED:
1315 spin_lock(&xprt->transport_lock);
1316 if (!xprt_test_and_set_connected(xprt)) {
1317 struct sock_xprt *transport = container_of(xprt,
1318 struct sock_xprt, xprt);
1319
1320 /* Reset TCP record info */
1321 transport->tcp_offset = 0;
1322 transport->tcp_reclen = 0;
1323 transport->tcp_copied = 0;
1324 transport->tcp_flags =
1325 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1326
1327 xprt_wake_pending_tasks(xprt, -EAGAIN);
1328 }
1329 spin_unlock(&xprt->transport_lock);
1330 break;
1331 case TCP_FIN_WAIT1:
1332 /* The client initiated a shutdown of the socket */
1333 xprt->connect_cookie++;
1334 xprt->reestablish_timeout = 0;
1335 set_bit(XPRT_CLOSING, &xprt->state);
1336 smp_mb__before_clear_bit();
1337 clear_bit(XPRT_CONNECTED, &xprt->state);
1338 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1339 smp_mb__after_clear_bit();
1340 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1341 break;
1342 case TCP_CLOSE_WAIT:
1343 /* The server initiated a shutdown of the socket */
1344 xprt_force_disconnect(xprt);
1345 case TCP_SYN_SENT:
1346 xprt->connect_cookie++;
1347 case TCP_CLOSING:
1348 /*
1349 * If the server closed down the connection, make sure that
1350 * we back off before reconnecting
1351 */
1352 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1353 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1354 break;
1355 case TCP_LAST_ACK:
1356 set_bit(XPRT_CLOSING, &xprt->state);
1357 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1358 smp_mb__before_clear_bit();
1359 clear_bit(XPRT_CONNECTED, &xprt->state);
1360 smp_mb__after_clear_bit();
1361 break;
1362 case TCP_CLOSE:
1363 xs_tcp_cancel_linger_timeout(xprt);
1364 xs_sock_mark_closed(xprt);
1365 }
1366 out:
1367 read_unlock_bh(&sk->sk_callback_lock);
1368 }
1369
1370 /**
1371 * xs_error_report - callback mainly for catching socket errors
1372 * @sk: socket
1373 */
1374 static void xs_error_report(struct sock *sk)
1375 {
1376 struct rpc_xprt *xprt;
1377
1378 read_lock_bh(&sk->sk_callback_lock);
1379 if (!(xprt = xprt_from_sock(sk)))
1380 goto out;
1381 dprintk("RPC: %s client %p...\n"
1382 "RPC: error %d\n",
1383 __func__, xprt, sk->sk_err);
1384 xprt_wake_pending_tasks(xprt, -EAGAIN);
1385 out:
1386 read_unlock_bh(&sk->sk_callback_lock);
1387 }
1388
1389 static void xs_write_space(struct sock *sk)
1390 {
1391 struct socket *sock;
1392 struct rpc_xprt *xprt;
1393
1394 if (unlikely(!(sock = sk->sk_socket)))
1395 return;
1396 clear_bit(SOCK_NOSPACE, &sock->flags);
1397
1398 if (unlikely(!(xprt = xprt_from_sock(sk))))
1399 return;
1400 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1401 return;
1402
1403 xprt_write_space(xprt);
1404 }
1405
1406 /**
1407 * xs_udp_write_space - callback invoked when socket buffer space
1408 * becomes available
1409 * @sk: socket whose state has changed
1410 *
1411 * Called when more output buffer space is available for this socket.
1412 * We try not to wake our writers until they can make "significant"
1413 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1414 * with a bunch of small requests.
1415 */
1416 static void xs_udp_write_space(struct sock *sk)
1417 {
1418 read_lock_bh(&sk->sk_callback_lock);
1419
1420 /* from net/core/sock.c:sock_def_write_space */
1421 if (sock_writeable(sk))
1422 xs_write_space(sk);
1423
1424 read_unlock_bh(&sk->sk_callback_lock);
1425 }
1426
1427 /**
1428 * xs_tcp_write_space - callback invoked when socket buffer space
1429 * becomes available
1430 * @sk: socket whose state has changed
1431 *
1432 * Called when more output buffer space is available for this socket.
1433 * We try not to wake our writers until they can make "significant"
1434 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1435 * with a bunch of small requests.
1436 */
1437 static void xs_tcp_write_space(struct sock *sk)
1438 {
1439 read_lock_bh(&sk->sk_callback_lock);
1440
1441 /* from net/core/stream.c:sk_stream_write_space */
1442 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1443 xs_write_space(sk);
1444
1445 read_unlock_bh(&sk->sk_callback_lock);
1446 }
1447
1448 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1449 {
1450 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1451 struct sock *sk = transport->inet;
1452
1453 if (transport->rcvsize) {
1454 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1455 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1456 }
1457 if (transport->sndsize) {
1458 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1459 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1460 sk->sk_write_space(sk);
1461 }
1462 }
1463
1464 /**
1465 * xs_udp_set_buffer_size - set send and receive limits
1466 * @xprt: generic transport
1467 * @sndsize: requested size of send buffer, in bytes
1468 * @rcvsize: requested size of receive buffer, in bytes
1469 *
1470 * Set socket send and receive buffer size limits.
1471 */
1472 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1473 {
1474 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1475
1476 transport->sndsize = 0;
1477 if (sndsize)
1478 transport->sndsize = sndsize + 1024;
1479 transport->rcvsize = 0;
1480 if (rcvsize)
1481 transport->rcvsize = rcvsize + 1024;
1482
1483 xs_udp_do_set_buffer_size(xprt);
1484 }
1485
1486 /**
1487 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1488 * @task: task that timed out
1489 *
1490 * Adjust the congestion window after a retransmit timeout has occurred.
1491 */
1492 static void xs_udp_timer(struct rpc_task *task)
1493 {
1494 xprt_adjust_cwnd(task, -ETIMEDOUT);
1495 }
1496
1497 static unsigned short xs_get_random_port(void)
1498 {
1499 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1500 unsigned short rand = (unsigned short) net_random() % range;
1501 return rand + xprt_min_resvport;
1502 }
1503
1504 /**
1505 * xs_set_port - reset the port number in the remote endpoint address
1506 * @xprt: generic transport
1507 * @port: new port number
1508 *
1509 */
1510 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1511 {
1512 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1513
1514 rpc_set_port(xs_addr(xprt), port);
1515 xs_update_peer_port(xprt);
1516 }
1517
1518 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1519 {
1520 unsigned short port = transport->srcport;
1521
1522 if (port == 0 && transport->xprt.resvport)
1523 port = xs_get_random_port();
1524 return port;
1525 }
1526
1527 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1528 {
1529 if (transport->srcport != 0)
1530 transport->srcport = 0;
1531 if (!transport->xprt.resvport)
1532 return 0;
1533 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1534 return xprt_max_resvport;
1535 return --port;
1536 }
1537 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1538 {
1539 struct sockaddr_storage myaddr;
1540 int err, nloop = 0;
1541 unsigned short port = xs_get_srcport(transport);
1542 unsigned short last;
1543
1544 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1545 do {
1546 rpc_set_port((struct sockaddr *)&myaddr, port);
1547 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1548 transport->xprt.addrlen);
1549 if (port == 0)
1550 break;
1551 if (err == 0) {
1552 transport->srcport = port;
1553 break;
1554 }
1555 last = port;
1556 port = xs_next_srcport(transport, port);
1557 if (port > last)
1558 nloop++;
1559 } while (err == -EADDRINUSE && nloop != 2);
1560
1561 if (myaddr.ss_family == AF_INET)
1562 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1563 &((struct sockaddr_in *)&myaddr)->sin_addr,
1564 port, err ? "failed" : "ok", err);
1565 else
1566 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1567 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1568 port, err ? "failed" : "ok", err);
1569 return err;
1570 }
1571
1572
1573 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1574 static struct lock_class_key xs_key[2];
1575 static struct lock_class_key xs_slock_key[2];
1576
1577 static inline void xs_reclassify_socket4(struct socket *sock)
1578 {
1579 struct sock *sk = sock->sk;
1580
1581 BUG_ON(sock_owned_by_user(sk));
1582 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1583 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1584 }
1585
1586 static inline void xs_reclassify_socket6(struct socket *sock)
1587 {
1588 struct sock *sk = sock->sk;
1589
1590 BUG_ON(sock_owned_by_user(sk));
1591 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1592 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1593 }
1594
1595 static inline void xs_reclassify_socket(int family, struct socket *sock)
1596 {
1597 switch (family) {
1598 case AF_INET:
1599 xs_reclassify_socket4(sock);
1600 break;
1601 case AF_INET6:
1602 xs_reclassify_socket6(sock);
1603 break;
1604 }
1605 }
1606 #else
1607 static inline void xs_reclassify_socket4(struct socket *sock)
1608 {
1609 }
1610
1611 static inline void xs_reclassify_socket6(struct socket *sock)
1612 {
1613 }
1614
1615 static inline void xs_reclassify_socket(int family, struct socket *sock)
1616 {
1617 }
1618 #endif
1619
1620 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1621 struct sock_xprt *transport, int family, int type, int protocol)
1622 {
1623 struct socket *sock;
1624 int err;
1625
1626 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1627 if (err < 0) {
1628 dprintk("RPC: can't create %d transport socket (%d).\n",
1629 protocol, -err);
1630 goto out;
1631 }
1632 xs_reclassify_socket(family, sock);
1633
1634 if (xs_bind(transport, sock)) {
1635 sock_release(sock);
1636 goto out;
1637 }
1638
1639 return sock;
1640 out:
1641 return ERR_PTR(err);
1642 }
1643
1644 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1645 {
1646 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1647
1648 if (!transport->inet) {
1649 struct sock *sk = sock->sk;
1650
1651 write_lock_bh(&sk->sk_callback_lock);
1652
1653 xs_save_old_callbacks(transport, sk);
1654
1655 sk->sk_user_data = xprt;
1656 sk->sk_data_ready = xs_udp_data_ready;
1657 sk->sk_write_space = xs_udp_write_space;
1658 sk->sk_error_report = xs_error_report;
1659 sk->sk_no_check = UDP_CSUM_NORCV;
1660 sk->sk_allocation = GFP_ATOMIC;
1661
1662 xprt_set_connected(xprt);
1663
1664 /* Reset to new socket */
1665 transport->sock = sock;
1666 transport->inet = sk;
1667
1668 write_unlock_bh(&sk->sk_callback_lock);
1669 }
1670 xs_udp_do_set_buffer_size(xprt);
1671 }
1672
1673 static void xs_udp_setup_socket(struct work_struct *work)
1674 {
1675 struct sock_xprt *transport =
1676 container_of(work, struct sock_xprt, connect_worker.work);
1677 struct rpc_xprt *xprt = &transport->xprt;
1678 struct socket *sock = transport->sock;
1679 int status = -EIO;
1680
1681 if (xprt->shutdown)
1682 goto out;
1683
1684 /* Start by resetting any existing state */
1685 xs_reset_transport(transport);
1686 sock = xs_create_sock(xprt, transport,
1687 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1688 if (IS_ERR(sock))
1689 goto out;
1690
1691 dprintk("RPC: worker connecting xprt %p via %s to "
1692 "%s (port %s)\n", xprt,
1693 xprt->address_strings[RPC_DISPLAY_PROTO],
1694 xprt->address_strings[RPC_DISPLAY_ADDR],
1695 xprt->address_strings[RPC_DISPLAY_PORT]);
1696
1697 xs_udp_finish_connecting(xprt, sock);
1698 status = 0;
1699 out:
1700 xprt_clear_connecting(xprt);
1701 xprt_wake_pending_tasks(xprt, status);
1702 }
1703
1704 /*
1705 * We need to preserve the port number so the reply cache on the server can
1706 * find our cached RPC replies when we get around to reconnecting.
1707 */
1708 static void xs_abort_connection(struct sock_xprt *transport)
1709 {
1710 int result;
1711 struct sockaddr any;
1712
1713 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
1714
1715 /*
1716 * Disconnect the transport socket by doing a connect operation
1717 * with AF_UNSPEC. This should return immediately...
1718 */
1719 memset(&any, 0, sizeof(any));
1720 any.sa_family = AF_UNSPEC;
1721 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1722 if (!result)
1723 xs_sock_mark_closed(&transport->xprt);
1724 else
1725 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1726 result);
1727 }
1728
1729 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
1730 {
1731 unsigned int state = transport->inet->sk_state;
1732
1733 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
1734 /* we don't need to abort the connection if the socket
1735 * hasn't undergone a shutdown
1736 */
1737 if (transport->inet->sk_shutdown == 0)
1738 return;
1739 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
1740 __func__, transport->inet->sk_shutdown);
1741 }
1742 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
1743 /* we don't need to abort the connection if the socket
1744 * hasn't undergone a shutdown
1745 */
1746 if (transport->inet->sk_shutdown == 0)
1747 return;
1748 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
1749 "sk_shutdown set to %d\n",
1750 __func__, transport->inet->sk_shutdown);
1751 }
1752 xs_abort_connection(transport);
1753 }
1754
1755 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1756 {
1757 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1758
1759 if (!transport->inet) {
1760 struct sock *sk = sock->sk;
1761
1762 write_lock_bh(&sk->sk_callback_lock);
1763
1764 xs_save_old_callbacks(transport, sk);
1765
1766 sk->sk_user_data = xprt;
1767 sk->sk_data_ready = xs_tcp_data_ready;
1768 sk->sk_state_change = xs_tcp_state_change;
1769 sk->sk_write_space = xs_tcp_write_space;
1770 sk->sk_error_report = xs_error_report;
1771 sk->sk_allocation = GFP_ATOMIC;
1772
1773 /* socket options */
1774 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1775 sock_reset_flag(sk, SOCK_LINGER);
1776 tcp_sk(sk)->linger2 = 0;
1777 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1778
1779 xprt_clear_connected(xprt);
1780
1781 /* Reset to new socket */
1782 transport->sock = sock;
1783 transport->inet = sk;
1784
1785 write_unlock_bh(&sk->sk_callback_lock);
1786 }
1787
1788 if (!xprt_bound(xprt))
1789 return -ENOTCONN;
1790
1791 /* Tell the socket layer to start connecting... */
1792 xprt->stat.connect_count++;
1793 xprt->stat.connect_start = jiffies;
1794 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1795 }
1796
1797 /**
1798 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1799 * @xprt: RPC transport to connect
1800 * @transport: socket transport to connect
1801 * @create_sock: function to create a socket of the correct type
1802 *
1803 * Invoked by a work queue tasklet.
1804 */
1805 static void xs_tcp_setup_socket(struct work_struct *work)
1806 {
1807 struct sock_xprt *transport =
1808 container_of(work, struct sock_xprt, connect_worker.work);
1809 struct socket *sock = transport->sock;
1810 struct rpc_xprt *xprt = &transport->xprt;
1811 int status = -EIO;
1812
1813 if (xprt->shutdown)
1814 goto out;
1815
1816 if (!sock) {
1817 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1818 sock = xs_create_sock(xprt, transport,
1819 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
1820 if (IS_ERR(sock)) {
1821 status = PTR_ERR(sock);
1822 goto out;
1823 }
1824 } else {
1825 int abort_and_exit;
1826
1827 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1828 &xprt->state);
1829 /* "close" the socket, preserving the local port */
1830 xs_tcp_reuse_connection(transport);
1831
1832 if (abort_and_exit)
1833 goto out_eagain;
1834 }
1835
1836 dprintk("RPC: worker connecting xprt %p via %s to "
1837 "%s (port %s)\n", xprt,
1838 xprt->address_strings[RPC_DISPLAY_PROTO],
1839 xprt->address_strings[RPC_DISPLAY_ADDR],
1840 xprt->address_strings[RPC_DISPLAY_PORT]);
1841
1842 status = xs_tcp_finish_connecting(xprt, sock);
1843 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1844 xprt, -status, xprt_connected(xprt),
1845 sock->sk->sk_state);
1846 switch (status) {
1847 default:
1848 printk("%s: connect returned unhandled error %d\n",
1849 __func__, status);
1850 case -EADDRNOTAVAIL:
1851 /* We're probably in TIME_WAIT. Get rid of existing socket,
1852 * and retry
1853 */
1854 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1855 xprt_force_disconnect(xprt);
1856 break;
1857 case -ECONNREFUSED:
1858 case -ECONNRESET:
1859 case -ENETUNREACH:
1860 /* retry with existing socket, after a delay */
1861 case 0:
1862 case -EINPROGRESS:
1863 case -EALREADY:
1864 xprt_clear_connecting(xprt);
1865 return;
1866 case -EINVAL:
1867 /* Happens, for instance, if the user specified a link
1868 * local IPv6 address without a scope-id.
1869 */
1870 goto out;
1871 }
1872 out_eagain:
1873 status = -EAGAIN;
1874 out:
1875 xprt_clear_connecting(xprt);
1876 xprt_wake_pending_tasks(xprt, status);
1877 }
1878
1879 /**
1880 * xs_connect - connect a socket to a remote endpoint
1881 * @task: address of RPC task that manages state of connect request
1882 *
1883 * TCP: If the remote end dropped the connection, delay reconnecting.
1884 *
1885 * UDP socket connects are synchronous, but we use a work queue anyway
1886 * to guarantee that even unprivileged user processes can set up a
1887 * socket on a privileged port.
1888 *
1889 * If a UDP socket connect fails, the delay behavior here prevents
1890 * retry floods (hard mounts).
1891 */
1892 static void xs_connect(struct rpc_task *task)
1893 {
1894 struct rpc_xprt *xprt = task->tk_xprt;
1895 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1896
1897 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
1898 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1899 "seconds\n",
1900 xprt, xprt->reestablish_timeout / HZ);
1901 queue_delayed_work(rpciod_workqueue,
1902 &transport->connect_worker,
1903 xprt->reestablish_timeout);
1904 xprt->reestablish_timeout <<= 1;
1905 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1906 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1907 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1908 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1909 } else {
1910 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1911 queue_delayed_work(rpciod_workqueue,
1912 &transport->connect_worker, 0);
1913 }
1914 }
1915
1916 /**
1917 * xs_udp_print_stats - display UDP socket-specifc stats
1918 * @xprt: rpc_xprt struct containing statistics
1919 * @seq: output file
1920 *
1921 */
1922 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1923 {
1924 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1925
1926 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1927 transport->srcport,
1928 xprt->stat.bind_count,
1929 xprt->stat.sends,
1930 xprt->stat.recvs,
1931 xprt->stat.bad_xids,
1932 xprt->stat.req_u,
1933 xprt->stat.bklog_u);
1934 }
1935
1936 /**
1937 * xs_tcp_print_stats - display TCP socket-specifc stats
1938 * @xprt: rpc_xprt struct containing statistics
1939 * @seq: output file
1940 *
1941 */
1942 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1943 {
1944 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1945 long idle_time = 0;
1946
1947 if (xprt_connected(xprt))
1948 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1949
1950 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1951 transport->srcport,
1952 xprt->stat.bind_count,
1953 xprt->stat.connect_count,
1954 xprt->stat.connect_time,
1955 idle_time,
1956 xprt->stat.sends,
1957 xprt->stat.recvs,
1958 xprt->stat.bad_xids,
1959 xprt->stat.req_u,
1960 xprt->stat.bklog_u);
1961 }
1962
1963 /*
1964 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
1965 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
1966 * to use the server side send routines.
1967 */
1968 static void *bc_malloc(struct rpc_task *task, size_t size)
1969 {
1970 struct page *page;
1971 struct rpc_buffer *buf;
1972
1973 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
1974 page = alloc_page(GFP_KERNEL);
1975
1976 if (!page)
1977 return NULL;
1978
1979 buf = page_address(page);
1980 buf->len = PAGE_SIZE;
1981
1982 return buf->data;
1983 }
1984
1985 /*
1986 * Free the space allocated in the bc_alloc routine
1987 */
1988 static void bc_free(void *buffer)
1989 {
1990 struct rpc_buffer *buf;
1991
1992 if (!buffer)
1993 return;
1994
1995 buf = container_of(buffer, struct rpc_buffer, data);
1996 free_page((unsigned long)buf);
1997 }
1998
1999 /*
2000 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2001 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2002 */
2003 static int bc_sendto(struct rpc_rqst *req)
2004 {
2005 int len;
2006 struct xdr_buf *xbufp = &req->rq_snd_buf;
2007 struct rpc_xprt *xprt = req->rq_xprt;
2008 struct sock_xprt *transport =
2009 container_of(xprt, struct sock_xprt, xprt);
2010 struct socket *sock = transport->sock;
2011 unsigned long headoff;
2012 unsigned long tailoff;
2013
2014 /*
2015 * Set up the rpc header and record marker stuff
2016 */
2017 xs_encode_tcp_record_marker(xbufp);
2018
2019 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2020 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2021 len = svc_send_common(sock, xbufp,
2022 virt_to_page(xbufp->head[0].iov_base), headoff,
2023 xbufp->tail[0].iov_base, tailoff);
2024
2025 if (len != xbufp->len) {
2026 printk(KERN_NOTICE "Error sending entire callback!\n");
2027 len = -EAGAIN;
2028 }
2029
2030 return len;
2031 }
2032
2033 /*
2034 * The send routine. Borrows from svc_send
2035 */
2036 static int bc_send_request(struct rpc_task *task)
2037 {
2038 struct rpc_rqst *req = task->tk_rqstp;
2039 struct svc_xprt *xprt;
2040 struct svc_sock *svsk;
2041 u32 len;
2042
2043 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2044 /*
2045 * Get the server socket associated with this callback xprt
2046 */
2047 xprt = req->rq_xprt->bc_xprt;
2048 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2049
2050 /*
2051 * Grab the mutex to serialize data as the connection is shared
2052 * with the fore channel
2053 */
2054 if (!mutex_trylock(&xprt->xpt_mutex)) {
2055 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2056 if (!mutex_trylock(&xprt->xpt_mutex))
2057 return -EAGAIN;
2058 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2059 }
2060 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2061 len = -ENOTCONN;
2062 else
2063 len = bc_sendto(req);
2064 mutex_unlock(&xprt->xpt_mutex);
2065
2066 if (len > 0)
2067 len = 0;
2068
2069 return len;
2070 }
2071
2072 /*
2073 * The close routine. Since this is client initiated, we do nothing
2074 */
2075
2076 static void bc_close(struct rpc_xprt *xprt)
2077 {
2078 }
2079
2080 /*
2081 * The xprt destroy routine. Again, because this connection is client
2082 * initiated, we do nothing
2083 */
2084
2085 static void bc_destroy(struct rpc_xprt *xprt)
2086 {
2087 }
2088
2089 static struct rpc_xprt_ops xs_udp_ops = {
2090 .set_buffer_size = xs_udp_set_buffer_size,
2091 .reserve_xprt = xprt_reserve_xprt_cong,
2092 .release_xprt = xprt_release_xprt_cong,
2093 .rpcbind = rpcb_getport_async,
2094 .set_port = xs_set_port,
2095 .connect = xs_connect,
2096 .buf_alloc = rpc_malloc,
2097 .buf_free = rpc_free,
2098 .send_request = xs_udp_send_request,
2099 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2100 .timer = xs_udp_timer,
2101 .release_request = xprt_release_rqst_cong,
2102 .close = xs_close,
2103 .destroy = xs_destroy,
2104 .print_stats = xs_udp_print_stats,
2105 };
2106
2107 static struct rpc_xprt_ops xs_tcp_ops = {
2108 .reserve_xprt = xprt_reserve_xprt,
2109 .release_xprt = xs_tcp_release_xprt,
2110 .rpcbind = rpcb_getport_async,
2111 .set_port = xs_set_port,
2112 .connect = xs_connect,
2113 .buf_alloc = rpc_malloc,
2114 .buf_free = rpc_free,
2115 .send_request = xs_tcp_send_request,
2116 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2117 .close = xs_tcp_close,
2118 .destroy = xs_destroy,
2119 .print_stats = xs_tcp_print_stats,
2120 };
2121
2122 /*
2123 * The rpc_xprt_ops for the server backchannel
2124 */
2125
2126 static struct rpc_xprt_ops bc_tcp_ops = {
2127 .reserve_xprt = xprt_reserve_xprt,
2128 .release_xprt = xprt_release_xprt,
2129 .buf_alloc = bc_malloc,
2130 .buf_free = bc_free,
2131 .send_request = bc_send_request,
2132 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2133 .close = bc_close,
2134 .destroy = bc_destroy,
2135 .print_stats = xs_tcp_print_stats,
2136 };
2137
2138 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2139 {
2140 static const struct sockaddr_in sin = {
2141 .sin_family = AF_INET,
2142 .sin_addr.s_addr = htonl(INADDR_ANY),
2143 };
2144 static const struct sockaddr_in6 sin6 = {
2145 .sin6_family = AF_INET6,
2146 .sin6_addr = IN6ADDR_ANY_INIT,
2147 };
2148
2149 switch (family) {
2150 case AF_INET:
2151 memcpy(sap, &sin, sizeof(sin));
2152 break;
2153 case AF_INET6:
2154 memcpy(sap, &sin6, sizeof(sin6));
2155 break;
2156 default:
2157 dprintk("RPC: %s: Bad address family\n", __func__);
2158 return -EAFNOSUPPORT;
2159 }
2160 return 0;
2161 }
2162
2163 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2164 unsigned int slot_table_size)
2165 {
2166 struct rpc_xprt *xprt;
2167 struct sock_xprt *new;
2168
2169 if (args->addrlen > sizeof(xprt->addr)) {
2170 dprintk("RPC: xs_setup_xprt: address too large\n");
2171 return ERR_PTR(-EBADF);
2172 }
2173
2174 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size);
2175 if (xprt == NULL) {
2176 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2177 "rpc_xprt\n");
2178 return ERR_PTR(-ENOMEM);
2179 }
2180
2181 new = container_of(xprt, struct sock_xprt, xprt);
2182 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2183 xprt->addrlen = args->addrlen;
2184 if (args->srcaddr)
2185 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2186 else {
2187 int err;
2188 err = xs_init_anyaddr(args->dstaddr->sa_family,
2189 (struct sockaddr *)&new->srcaddr);
2190 if (err != 0)
2191 return ERR_PTR(err);
2192 }
2193
2194 return xprt;
2195 }
2196
2197 static const struct rpc_timeout xs_udp_default_timeout = {
2198 .to_initval = 5 * HZ,
2199 .to_maxval = 30 * HZ,
2200 .to_increment = 5 * HZ,
2201 .to_retries = 5,
2202 };
2203
2204 /**
2205 * xs_setup_udp - Set up transport to use a UDP socket
2206 * @args: rpc transport creation arguments
2207 *
2208 */
2209 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2210 {
2211 struct sockaddr *addr = args->dstaddr;
2212 struct rpc_xprt *xprt;
2213 struct sock_xprt *transport;
2214 struct rpc_xprt *ret;
2215
2216 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2217 if (IS_ERR(xprt))
2218 return xprt;
2219 transport = container_of(xprt, struct sock_xprt, xprt);
2220
2221 xprt->prot = IPPROTO_UDP;
2222 xprt->tsh_size = 0;
2223 /* XXX: header size can vary due to auth type, IPv6, etc. */
2224 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2225
2226 xprt->bind_timeout = XS_BIND_TO;
2227 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2228 xprt->idle_timeout = XS_IDLE_DISC_TO;
2229
2230 xprt->ops = &xs_udp_ops;
2231
2232 xprt->timeout = &xs_udp_default_timeout;
2233
2234 switch (addr->sa_family) {
2235 case AF_INET:
2236 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2237 xprt_set_bound(xprt);
2238
2239 INIT_DELAYED_WORK(&transport->connect_worker,
2240 xs_udp_setup_socket);
2241 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2242 break;
2243 case AF_INET6:
2244 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2245 xprt_set_bound(xprt);
2246
2247 INIT_DELAYED_WORK(&transport->connect_worker,
2248 xs_udp_setup_socket);
2249 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2250 break;
2251 default:
2252 ret = ERR_PTR(-EAFNOSUPPORT);
2253 goto out_err;
2254 }
2255
2256 if (xprt_bound(xprt))
2257 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2258 xprt->address_strings[RPC_DISPLAY_ADDR],
2259 xprt->address_strings[RPC_DISPLAY_PORT],
2260 xprt->address_strings[RPC_DISPLAY_PROTO]);
2261 else
2262 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2263 xprt->address_strings[RPC_DISPLAY_ADDR],
2264 xprt->address_strings[RPC_DISPLAY_PROTO]);
2265
2266 if (try_module_get(THIS_MODULE))
2267 return xprt;
2268 ret = ERR_PTR(-EINVAL);
2269 out_err:
2270 xprt_free(xprt);
2271 return ret;
2272 }
2273
2274 static const struct rpc_timeout xs_tcp_default_timeout = {
2275 .to_initval = 60 * HZ,
2276 .to_maxval = 60 * HZ,
2277 .to_retries = 2,
2278 };
2279
2280 /**
2281 * xs_setup_tcp - Set up transport to use a TCP socket
2282 * @args: rpc transport creation arguments
2283 *
2284 */
2285 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2286 {
2287 struct sockaddr *addr = args->dstaddr;
2288 struct rpc_xprt *xprt;
2289 struct sock_xprt *transport;
2290 struct rpc_xprt *ret;
2291
2292 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2293 if (IS_ERR(xprt))
2294 return xprt;
2295 transport = container_of(xprt, struct sock_xprt, xprt);
2296
2297 xprt->prot = IPPROTO_TCP;
2298 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2299 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2300
2301 xprt->bind_timeout = XS_BIND_TO;
2302 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2303 xprt->idle_timeout = XS_IDLE_DISC_TO;
2304
2305 xprt->ops = &xs_tcp_ops;
2306 xprt->timeout = &xs_tcp_default_timeout;
2307
2308 switch (addr->sa_family) {
2309 case AF_INET:
2310 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2311 xprt_set_bound(xprt);
2312
2313 INIT_DELAYED_WORK(&transport->connect_worker,
2314 xs_tcp_setup_socket);
2315 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2316 break;
2317 case AF_INET6:
2318 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2319 xprt_set_bound(xprt);
2320
2321 INIT_DELAYED_WORK(&transport->connect_worker,
2322 xs_tcp_setup_socket);
2323 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2324 break;
2325 default:
2326 ret = ERR_PTR(-EAFNOSUPPORT);
2327 goto out_err;
2328 }
2329
2330 if (xprt_bound(xprt))
2331 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2332 xprt->address_strings[RPC_DISPLAY_ADDR],
2333 xprt->address_strings[RPC_DISPLAY_PORT],
2334 xprt->address_strings[RPC_DISPLAY_PROTO]);
2335 else
2336 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2337 xprt->address_strings[RPC_DISPLAY_ADDR],
2338 xprt->address_strings[RPC_DISPLAY_PROTO]);
2339
2340
2341 if (try_module_get(THIS_MODULE))
2342 return xprt;
2343 ret = ERR_PTR(-EINVAL);
2344 out_err:
2345 xprt_free(xprt);
2346 return ret;
2347 }
2348
2349 /**
2350 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2351 * @args: rpc transport creation arguments
2352 *
2353 */
2354 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2355 {
2356 struct sockaddr *addr = args->dstaddr;
2357 struct rpc_xprt *xprt;
2358 struct sock_xprt *transport;
2359 struct svc_sock *bc_sock;
2360 struct rpc_xprt *ret;
2361
2362 if (args->bc_xprt->xpt_bc_xprt) {
2363 /*
2364 * This server connection already has a backchannel
2365 * export; we can't create a new one, as we wouldn't be
2366 * able to match replies based on xid any more. So,
2367 * reuse the already-existing one:
2368 */
2369 return args->bc_xprt->xpt_bc_xprt;
2370 }
2371 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2372 if (IS_ERR(xprt))
2373 return xprt;
2374 transport = container_of(xprt, struct sock_xprt, xprt);
2375
2376 xprt->prot = IPPROTO_TCP;
2377 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2378 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2379 xprt->timeout = &xs_tcp_default_timeout;
2380
2381 /* backchannel */
2382 xprt_set_bound(xprt);
2383 xprt->bind_timeout = 0;
2384 xprt->reestablish_timeout = 0;
2385 xprt->idle_timeout = 0;
2386
2387 xprt->ops = &bc_tcp_ops;
2388
2389 switch (addr->sa_family) {
2390 case AF_INET:
2391 xs_format_peer_addresses(xprt, "tcp",
2392 RPCBIND_NETID_TCP);
2393 break;
2394 case AF_INET6:
2395 xs_format_peer_addresses(xprt, "tcp",
2396 RPCBIND_NETID_TCP6);
2397 break;
2398 default:
2399 ret = ERR_PTR(-EAFNOSUPPORT);
2400 goto out_err;
2401 }
2402
2403 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2404 xprt->address_strings[RPC_DISPLAY_ADDR],
2405 xprt->address_strings[RPC_DISPLAY_PORT],
2406 xprt->address_strings[RPC_DISPLAY_PROTO]);
2407
2408 /*
2409 * Once we've associated a backchannel xprt with a connection,
2410 * we want to keep it around as long as long as the connection
2411 * lasts, in case we need to start using it for a backchannel
2412 * again; this reference won't be dropped until bc_xprt is
2413 * destroyed.
2414 */
2415 xprt_get(xprt);
2416 args->bc_xprt->xpt_bc_xprt = xprt;
2417 xprt->bc_xprt = args->bc_xprt;
2418 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2419 transport->sock = bc_sock->sk_sock;
2420 transport->inet = bc_sock->sk_sk;
2421
2422 /*
2423 * Since we don't want connections for the backchannel, we set
2424 * the xprt status to connected
2425 */
2426 xprt_set_connected(xprt);
2427
2428
2429 if (try_module_get(THIS_MODULE))
2430 return xprt;
2431 xprt_put(xprt);
2432 ret = ERR_PTR(-EINVAL);
2433 out_err:
2434 xprt_free(xprt);
2435 return ret;
2436 }
2437
2438 static struct xprt_class xs_udp_transport = {
2439 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2440 .name = "udp",
2441 .owner = THIS_MODULE,
2442 .ident = XPRT_TRANSPORT_UDP,
2443 .setup = xs_setup_udp,
2444 };
2445
2446 static struct xprt_class xs_tcp_transport = {
2447 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2448 .name = "tcp",
2449 .owner = THIS_MODULE,
2450 .ident = XPRT_TRANSPORT_TCP,
2451 .setup = xs_setup_tcp,
2452 };
2453
2454 static struct xprt_class xs_bc_tcp_transport = {
2455 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2456 .name = "tcp NFSv4.1 backchannel",
2457 .owner = THIS_MODULE,
2458 .ident = XPRT_TRANSPORT_BC_TCP,
2459 .setup = xs_setup_bc_tcp,
2460 };
2461
2462 /**
2463 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2464 *
2465 */
2466 int init_socket_xprt(void)
2467 {
2468 #ifdef RPC_DEBUG
2469 if (!sunrpc_table_header)
2470 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2471 #endif
2472
2473 xprt_register_transport(&xs_udp_transport);
2474 xprt_register_transport(&xs_tcp_transport);
2475 xprt_register_transport(&xs_bc_tcp_transport);
2476
2477 return 0;
2478 }
2479
2480 /**
2481 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2482 *
2483 */
2484 void cleanup_socket_xprt(void)
2485 {
2486 #ifdef RPC_DEBUG
2487 if (sunrpc_table_header) {
2488 unregister_sysctl_table(sunrpc_table_header);
2489 sunrpc_table_header = NULL;
2490 }
2491 #endif
2492
2493 xprt_unregister_transport(&xs_udp_transport);
2494 xprt_unregister_transport(&xs_tcp_transport);
2495 xprt_unregister_transport(&xs_bc_tcp_transport);
2496 }
2497
2498 static int param_set_uint_minmax(const char *val,
2499 const struct kernel_param *kp,
2500 unsigned int min, unsigned int max)
2501 {
2502 unsigned long num;
2503 int ret;
2504
2505 if (!val)
2506 return -EINVAL;
2507 ret = strict_strtoul(val, 0, &num);
2508 if (ret == -EINVAL || num < min || num > max)
2509 return -EINVAL;
2510 *((unsigned int *)kp->arg) = num;
2511 return 0;
2512 }
2513
2514 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2515 {
2516 return param_set_uint_minmax(val, kp,
2517 RPC_MIN_RESVPORT,
2518 RPC_MAX_RESVPORT);
2519 }
2520
2521 static struct kernel_param_ops param_ops_portnr = {
2522 .set = param_set_portnr,
2523 .get = param_get_uint,
2524 };
2525
2526 #define param_check_portnr(name, p) \
2527 __param_check(name, p, unsigned int);
2528
2529 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2530 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2531
2532 static int param_set_slot_table_size(const char *val,
2533 const struct kernel_param *kp)
2534 {
2535 return param_set_uint_minmax(val, kp,
2536 RPC_MIN_SLOT_TABLE,
2537 RPC_MAX_SLOT_TABLE);
2538 }
2539
2540 static struct kernel_param_ops param_ops_slot_table_size = {
2541 .set = param_set_slot_table_size,
2542 .get = param_get_uint,
2543 };
2544
2545 #define param_check_slot_table_size(name, p) \
2546 __param_check(name, p, unsigned int);
2547
2548 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2549 slot_table_size, 0644);
2550 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2551 slot_table_size, 0644);
2552
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree