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FRV: Use generic show_interrupts()
[cris-mirror.git] / net / sunrpc / xprtsock.c
blob1e336a06d3e6375af0221b5a65f9db7236c2c4a0
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 transport->srcport = 0;
714
715 write_lock_bh(&sk->sk_callback_lock);
716 transport->inet = NULL;
717 transport->sock = NULL;
718
719 sk->sk_user_data = NULL;
720
721 xs_restore_old_callbacks(transport, sk);
722 write_unlock_bh(&sk->sk_callback_lock);
723
724 sk->sk_no_check = 0;
725
726 sock_release(sock);
727 }
728
729 /**
730 * xs_close - close a socket
731 * @xprt: transport
732 *
733 * This is used when all requests are complete; ie, no DRC state remains
734 * on the server we want to save.
735 *
736 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
737 * xs_reset_transport() zeroing the socket from underneath a writer.
738 */
739 static void xs_close(struct rpc_xprt *xprt)
740 {
741 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
742
743 dprintk("RPC: xs_close xprt %p\n", xprt);
744
745 xs_reset_transport(transport);
746 xprt->reestablish_timeout = 0;
747
748 smp_mb__before_clear_bit();
749 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
750 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
751 clear_bit(XPRT_CLOSING, &xprt->state);
752 smp_mb__after_clear_bit();
753 xprt_disconnect_done(xprt);
754 }
755
756 static void xs_tcp_close(struct rpc_xprt *xprt)
757 {
758 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
759 xs_close(xprt);
760 else
761 xs_tcp_shutdown(xprt);
762 }
763
764 /**
765 * xs_destroy - prepare to shutdown a transport
766 * @xprt: doomed transport
767 *
768 */
769 static void xs_destroy(struct rpc_xprt *xprt)
770 {
771 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
772
773 dprintk("RPC: xs_destroy xprt %p\n", xprt);
774
775 cancel_delayed_work_sync(&transport->connect_worker);
776
777 xs_close(xprt);
778 xs_free_peer_addresses(xprt);
779 xprt_free(xprt);
780 module_put(THIS_MODULE);
781 }
782
783 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
784 {
785 return (struct rpc_xprt *) sk->sk_user_data;
786 }
787
788 /**
789 * xs_udp_data_ready - "data ready" callback for UDP sockets
790 * @sk: socket with data to read
791 * @len: how much data to read
792 *
793 */
794 static void xs_udp_data_ready(struct sock *sk, int len)
795 {
796 struct rpc_task *task;
797 struct rpc_xprt *xprt;
798 struct rpc_rqst *rovr;
799 struct sk_buff *skb;
800 int err, repsize, copied;
801 u32 _xid;
802 __be32 *xp;
803
804 read_lock_bh(&sk->sk_callback_lock);
805 dprintk("RPC: xs_udp_data_ready...\n");
806 if (!(xprt = xprt_from_sock(sk)))
807 goto out;
808
809 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
810 goto out;
811
812 if (xprt->shutdown)
813 goto dropit;
814
815 repsize = skb->len - sizeof(struct udphdr);
816 if (repsize < 4) {
817 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
818 goto dropit;
819 }
820
821 /* Copy the XID from the skb... */
822 xp = skb_header_pointer(skb, sizeof(struct udphdr),
823 sizeof(_xid), &_xid);
824 if (xp == NULL)
825 goto dropit;
826
827 /* Look up and lock the request corresponding to the given XID */
828 spin_lock(&xprt->transport_lock);
829 rovr = xprt_lookup_rqst(xprt, *xp);
830 if (!rovr)
831 goto out_unlock;
832 task = rovr->rq_task;
833
834 if ((copied = rovr->rq_private_buf.buflen) > repsize)
835 copied = repsize;
836
837 /* Suck it into the iovec, verify checksum if not done by hw. */
838 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
839 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
840 goto out_unlock;
841 }
842
843 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
844
845 /* Something worked... */
846 dst_confirm(skb_dst(skb));
847
848 xprt_adjust_cwnd(task, copied);
849 xprt_complete_rqst(task, copied);
850
851 out_unlock:
852 spin_unlock(&xprt->transport_lock);
853 dropit:
854 skb_free_datagram(sk, skb);
855 out:
856 read_unlock_bh(&sk->sk_callback_lock);
857 }
858
859 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
860 {
861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
862 size_t len, used;
863 char *p;
864
865 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
866 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
867 used = xdr_skb_read_bits(desc, p, len);
868 transport->tcp_offset += used;
869 if (used != len)
870 return;
871
872 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
873 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
874 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
875 else
876 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
877 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
878
879 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
880 transport->tcp_offset = 0;
881
882 /* Sanity check of the record length */
883 if (unlikely(transport->tcp_reclen < 8)) {
884 dprintk("RPC: invalid TCP record fragment length\n");
885 xprt_force_disconnect(xprt);
886 return;
887 }
888 dprintk("RPC: reading TCP record fragment of length %d\n",
889 transport->tcp_reclen);
890 }
891
892 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
893 {
894 if (transport->tcp_offset == transport->tcp_reclen) {
895 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
896 transport->tcp_offset = 0;
897 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
898 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
899 transport->tcp_flags |= TCP_RCV_COPY_XID;
900 transport->tcp_copied = 0;
901 }
902 }
903 }
904
905 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
906 {
907 size_t len, used;
908 char *p;
909
910 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
911 dprintk("RPC: reading XID (%Zu bytes)\n", len);
912 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
913 used = xdr_skb_read_bits(desc, p, len);
914 transport->tcp_offset += used;
915 if (used != len)
916 return;
917 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
918 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
919 transport->tcp_copied = 4;
920 dprintk("RPC: reading %s XID %08x\n",
921 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
922 : "request with",
923 ntohl(transport->tcp_xid));
924 xs_tcp_check_fraghdr(transport);
925 }
926
927 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
928 struct xdr_skb_reader *desc)
929 {
930 size_t len, used;
931 u32 offset;
932 char *p;
933
934 /*
935 * We want transport->tcp_offset to be 8 at the end of this routine
936 * (4 bytes for the xid and 4 bytes for the call/reply flag).
937 * When this function is called for the first time,
938 * transport->tcp_offset is 4 (after having already read the xid).
939 */
940 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
941 len = sizeof(transport->tcp_calldir) - offset;
942 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
943 p = ((char *) &transport->tcp_calldir) + offset;
944 used = xdr_skb_read_bits(desc, p, len);
945 transport->tcp_offset += used;
946 if (used != len)
947 return;
948 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
949 /*
950 * We don't yet have the XDR buffer, so we will write the calldir
951 * out after we get the buffer from the 'struct rpc_rqst'
952 */
953 switch (ntohl(transport->tcp_calldir)) {
954 case RPC_REPLY:
955 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
956 transport->tcp_flags |= TCP_RCV_COPY_DATA;
957 transport->tcp_flags |= TCP_RPC_REPLY;
958 break;
959 case RPC_CALL:
960 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
961 transport->tcp_flags |= TCP_RCV_COPY_DATA;
962 transport->tcp_flags &= ~TCP_RPC_REPLY;
963 break;
964 default:
965 dprintk("RPC: invalid request message type\n");
966 xprt_force_disconnect(&transport->xprt);
967 }
968 xs_tcp_check_fraghdr(transport);
969 }
970
971 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
972 struct xdr_skb_reader *desc,
973 struct rpc_rqst *req)
974 {
975 struct sock_xprt *transport =
976 container_of(xprt, struct sock_xprt, xprt);
977 struct xdr_buf *rcvbuf;
978 size_t len;
979 ssize_t r;
980
981 rcvbuf = &req->rq_private_buf;
982
983 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
984 /*
985 * Save the RPC direction in the XDR buffer
986 */
987 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
988 &transport->tcp_calldir,
989 sizeof(transport->tcp_calldir));
990 transport->tcp_copied += sizeof(transport->tcp_calldir);
991 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
992 }
993
994 len = desc->count;
995 if (len > transport->tcp_reclen - transport->tcp_offset) {
996 struct xdr_skb_reader my_desc;
997
998 len = transport->tcp_reclen - transport->tcp_offset;
999 memcpy(&my_desc, desc, sizeof(my_desc));
1000 my_desc.count = len;
1001 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1002 &my_desc, xdr_skb_read_bits);
1003 desc->count -= r;
1004 desc->offset += r;
1005 } else
1006 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1007 desc, xdr_skb_read_bits);
1008
1009 if (r > 0) {
1010 transport->tcp_copied += r;
1011 transport->tcp_offset += r;
1012 }
1013 if (r != len) {
1014 /* Error when copying to the receive buffer,
1015 * usually because we weren't able to allocate
1016 * additional buffer pages. All we can do now
1017 * is turn off TCP_RCV_COPY_DATA, so the request
1018 * will not receive any additional updates,
1019 * and time out.
1020 * Any remaining data from this record will
1021 * be discarded.
1022 */
1023 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1024 dprintk("RPC: XID %08x truncated request\n",
1025 ntohl(transport->tcp_xid));
1026 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1027 "tcp_offset = %u, tcp_reclen = %u\n",
1028 xprt, transport->tcp_copied,
1029 transport->tcp_offset, transport->tcp_reclen);
1030 return;
1031 }
1032
1033 dprintk("RPC: XID %08x read %Zd bytes\n",
1034 ntohl(transport->tcp_xid), r);
1035 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1036 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1037 transport->tcp_offset, transport->tcp_reclen);
1038
1039 if (transport->tcp_copied == req->rq_private_buf.buflen)
1040 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1041 else if (transport->tcp_offset == transport->tcp_reclen) {
1042 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1043 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1044 }
1045 }
1046
1047 /*
1048 * Finds the request corresponding to the RPC xid and invokes the common
1049 * tcp read code to read the data.
1050 */
1051 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1052 struct xdr_skb_reader *desc)
1053 {
1054 struct sock_xprt *transport =
1055 container_of(xprt, struct sock_xprt, xprt);
1056 struct rpc_rqst *req;
1057
1058 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1059
1060 /* Find and lock the request corresponding to this xid */
1061 spin_lock(&xprt->transport_lock);
1062 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1063 if (!req) {
1064 dprintk("RPC: XID %08x request not found!\n",
1065 ntohl(transport->tcp_xid));
1066 spin_unlock(&xprt->transport_lock);
1067 return -1;
1068 }
1069
1070 xs_tcp_read_common(xprt, desc, req);
1071
1072 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1073 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1074
1075 spin_unlock(&xprt->transport_lock);
1076 return 0;
1077 }
1078
1079 #if defined(CONFIG_NFS_V4_1)
1080 /*
1081 * Obtains an rpc_rqst previously allocated and invokes the common
1082 * tcp read code to read the data. The result is placed in the callback
1083 * queue.
1084 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1085 * connection and return -1.
1086 */
1087 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1088 struct xdr_skb_reader *desc)
1089 {
1090 struct sock_xprt *transport =
1091 container_of(xprt, struct sock_xprt, xprt);
1092 struct rpc_rqst *req;
1093
1094 req = xprt_alloc_bc_request(xprt);
1095 if (req == NULL) {
1096 printk(KERN_WARNING "Callback slot table overflowed\n");
1097 xprt_force_disconnect(xprt);
1098 return -1;
1099 }
1100
1101 req->rq_xid = transport->tcp_xid;
1102 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1103 xs_tcp_read_common(xprt, desc, req);
1104
1105 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1106 struct svc_serv *bc_serv = xprt->bc_serv;
1107
1108 /*
1109 * Add callback request to callback list. The callback
1110 * service sleeps on the sv_cb_waitq waiting for new
1111 * requests. Wake it up after adding enqueing the
1112 * request.
1113 */
1114 dprintk("RPC: add callback request to list\n");
1115 spin_lock(&bc_serv->sv_cb_lock);
1116 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1117 spin_unlock(&bc_serv->sv_cb_lock);
1118 wake_up(&bc_serv->sv_cb_waitq);
1119 }
1120
1121 req->rq_private_buf.len = transport->tcp_copied;
1122
1123 return 0;
1124 }
1125
1126 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1127 struct xdr_skb_reader *desc)
1128 {
1129 struct sock_xprt *transport =
1130 container_of(xprt, struct sock_xprt, xprt);
1131
1132 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1133 xs_tcp_read_reply(xprt, desc) :
1134 xs_tcp_read_callback(xprt, desc);
1135 }
1136 #else
1137 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1138 struct xdr_skb_reader *desc)
1139 {
1140 return xs_tcp_read_reply(xprt, desc);
1141 }
1142 #endif /* CONFIG_NFS_V4_1 */
1143
1144 /*
1145 * Read data off the transport. This can be either an RPC_CALL or an
1146 * RPC_REPLY. Relay the processing to helper functions.
1147 */
1148 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1149 struct xdr_skb_reader *desc)
1150 {
1151 struct sock_xprt *transport =
1152 container_of(xprt, struct sock_xprt, xprt);
1153
1154 if (_xs_tcp_read_data(xprt, desc) == 0)
1155 xs_tcp_check_fraghdr(transport);
1156 else {
1157 /*
1158 * The transport_lock protects the request handling.
1159 * There's no need to hold it to update the tcp_flags.
1160 */
1161 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1162 }
1163 }
1164
1165 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1166 {
1167 size_t len;
1168
1169 len = transport->tcp_reclen - transport->tcp_offset;
1170 if (len > desc->count)
1171 len = desc->count;
1172 desc->count -= len;
1173 desc->offset += len;
1174 transport->tcp_offset += len;
1175 dprintk("RPC: discarded %Zu bytes\n", len);
1176 xs_tcp_check_fraghdr(transport);
1177 }
1178
1179 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1180 {
1181 struct rpc_xprt *xprt = rd_desc->arg.data;
1182 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1183 struct xdr_skb_reader desc = {
1184 .skb = skb,
1185 .offset = offset,
1186 .count = len,
1187 };
1188
1189 dprintk("RPC: xs_tcp_data_recv started\n");
1190 do {
1191 /* Read in a new fragment marker if necessary */
1192 /* Can we ever really expect to get completely empty fragments? */
1193 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1194 xs_tcp_read_fraghdr(xprt, &desc);
1195 continue;
1196 }
1197 /* Read in the xid if necessary */
1198 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1199 xs_tcp_read_xid(transport, &desc);
1200 continue;
1201 }
1202 /* Read in the call/reply flag */
1203 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1204 xs_tcp_read_calldir(transport, &desc);
1205 continue;
1206 }
1207 /* Read in the request data */
1208 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1209 xs_tcp_read_data(xprt, &desc);
1210 continue;
1211 }
1212 /* Skip over any trailing bytes on short reads */
1213 xs_tcp_read_discard(transport, &desc);
1214 } while (desc.count);
1215 dprintk("RPC: xs_tcp_data_recv done\n");
1216 return len - desc.count;
1217 }
1218
1219 /**
1220 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1221 * @sk: socket with data to read
1222 * @bytes: how much data to read
1223 *
1224 */
1225 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1226 {
1227 struct rpc_xprt *xprt;
1228 read_descriptor_t rd_desc;
1229 int read;
1230
1231 dprintk("RPC: xs_tcp_data_ready...\n");
1232
1233 read_lock_bh(&sk->sk_callback_lock);
1234 if (!(xprt = xprt_from_sock(sk)))
1235 goto out;
1236 if (xprt->shutdown)
1237 goto out;
1238
1239 /* Any data means we had a useful conversation, so
1240 * the we don't need to delay the next reconnect
1241 */
1242 if (xprt->reestablish_timeout)
1243 xprt->reestablish_timeout = 0;
1244
1245 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1246 rd_desc.arg.data = xprt;
1247 do {
1248 rd_desc.count = 65536;
1249 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1250 } while (read > 0);
1251 out:
1252 read_unlock_bh(&sk->sk_callback_lock);
1253 }
1254
1255 /*
1256 * Do the equivalent of linger/linger2 handling for dealing with
1257 * broken servers that don't close the socket in a timely
1258 * fashion
1259 */
1260 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1261 unsigned long timeout)
1262 {
1263 struct sock_xprt *transport;
1264
1265 if (xprt_test_and_set_connecting(xprt))
1266 return;
1267 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1268 transport = container_of(xprt, struct sock_xprt, xprt);
1269 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1270 timeout);
1271 }
1272
1273 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1274 {
1275 struct sock_xprt *transport;
1276
1277 transport = container_of(xprt, struct sock_xprt, xprt);
1278
1279 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1280 !cancel_delayed_work(&transport->connect_worker))
1281 return;
1282 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1283 xprt_clear_connecting(xprt);
1284 }
1285
1286 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1287 {
1288 smp_mb__before_clear_bit();
1289 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1290 clear_bit(XPRT_CLOSING, &xprt->state);
1291 smp_mb__after_clear_bit();
1292 /* Mark transport as closed and wake up all pending tasks */
1293 xprt_disconnect_done(xprt);
1294 }
1295
1296 /**
1297 * xs_tcp_state_change - callback to handle TCP socket state changes
1298 * @sk: socket whose state has changed
1299 *
1300 */
1301 static void xs_tcp_state_change(struct sock *sk)
1302 {
1303 struct rpc_xprt *xprt;
1304
1305 read_lock_bh(&sk->sk_callback_lock);
1306 if (!(xprt = xprt_from_sock(sk)))
1307 goto out;
1308 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1309 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1310 sk->sk_state, xprt_connected(xprt),
1311 sock_flag(sk, SOCK_DEAD),
1312 sock_flag(sk, SOCK_ZAPPED),
1313 sk->sk_shutdown);
1314
1315 switch (sk->sk_state) {
1316 case TCP_ESTABLISHED:
1317 spin_lock(&xprt->transport_lock);
1318 if (!xprt_test_and_set_connected(xprt)) {
1319 struct sock_xprt *transport = container_of(xprt,
1320 struct sock_xprt, xprt);
1321
1322 /* Reset TCP record info */
1323 transport->tcp_offset = 0;
1324 transport->tcp_reclen = 0;
1325 transport->tcp_copied = 0;
1326 transport->tcp_flags =
1327 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1328
1329 xprt_wake_pending_tasks(xprt, -EAGAIN);
1330 }
1331 spin_unlock(&xprt->transport_lock);
1332 break;
1333 case TCP_FIN_WAIT1:
1334 /* The client initiated a shutdown of the socket */
1335 xprt->connect_cookie++;
1336 xprt->reestablish_timeout = 0;
1337 set_bit(XPRT_CLOSING, &xprt->state);
1338 smp_mb__before_clear_bit();
1339 clear_bit(XPRT_CONNECTED, &xprt->state);
1340 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1341 smp_mb__after_clear_bit();
1342 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1343 break;
1344 case TCP_CLOSE_WAIT:
1345 /* The server initiated a shutdown of the socket */
1346 xprt_force_disconnect(xprt);
1347 case TCP_SYN_SENT:
1348 xprt->connect_cookie++;
1349 case TCP_CLOSING:
1350 /*
1351 * If the server closed down the connection, make sure that
1352 * we back off before reconnecting
1353 */
1354 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1355 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1356 break;
1357 case TCP_LAST_ACK:
1358 set_bit(XPRT_CLOSING, &xprt->state);
1359 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1360 smp_mb__before_clear_bit();
1361 clear_bit(XPRT_CONNECTED, &xprt->state);
1362 smp_mb__after_clear_bit();
1363 break;
1364 case TCP_CLOSE:
1365 xs_tcp_cancel_linger_timeout(xprt);
1366 xs_sock_mark_closed(xprt);
1367 }
1368 out:
1369 read_unlock_bh(&sk->sk_callback_lock);
1370 }
1371
1372 /**
1373 * xs_error_report - callback mainly for catching socket errors
1374 * @sk: socket
1375 */
1376 static void xs_error_report(struct sock *sk)
1377 {
1378 struct rpc_xprt *xprt;
1379
1380 read_lock_bh(&sk->sk_callback_lock);
1381 if (!(xprt = xprt_from_sock(sk)))
1382 goto out;
1383 dprintk("RPC: %s client %p...\n"
1384 "RPC: error %d\n",
1385 __func__, xprt, sk->sk_err);
1386 xprt_wake_pending_tasks(xprt, -EAGAIN);
1387 out:
1388 read_unlock_bh(&sk->sk_callback_lock);
1389 }
1390
1391 static void xs_write_space(struct sock *sk)
1392 {
1393 struct socket *sock;
1394 struct rpc_xprt *xprt;
1395
1396 if (unlikely(!(sock = sk->sk_socket)))
1397 return;
1398 clear_bit(SOCK_NOSPACE, &sock->flags);
1399
1400 if (unlikely(!(xprt = xprt_from_sock(sk))))
1401 return;
1402 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1403 return;
1404
1405 xprt_write_space(xprt);
1406 }
1407
1408 /**
1409 * xs_udp_write_space - callback invoked when socket buffer space
1410 * becomes available
1411 * @sk: socket whose state has changed
1412 *
1413 * Called when more output buffer space is available for this socket.
1414 * We try not to wake our writers until they can make "significant"
1415 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1416 * with a bunch of small requests.
1417 */
1418 static void xs_udp_write_space(struct sock *sk)
1419 {
1420 read_lock_bh(&sk->sk_callback_lock);
1421
1422 /* from net/core/sock.c:sock_def_write_space */
1423 if (sock_writeable(sk))
1424 xs_write_space(sk);
1425
1426 read_unlock_bh(&sk->sk_callback_lock);
1427 }
1428
1429 /**
1430 * xs_tcp_write_space - callback invoked when socket buffer space
1431 * becomes available
1432 * @sk: socket whose state has changed
1433 *
1434 * Called when more output buffer space is available for this socket.
1435 * We try not to wake our writers until they can make "significant"
1436 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1437 * with a bunch of small requests.
1438 */
1439 static void xs_tcp_write_space(struct sock *sk)
1440 {
1441 read_lock_bh(&sk->sk_callback_lock);
1442
1443 /* from net/core/stream.c:sk_stream_write_space */
1444 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1445 xs_write_space(sk);
1446
1447 read_unlock_bh(&sk->sk_callback_lock);
1448 }
1449
1450 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1451 {
1452 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1453 struct sock *sk = transport->inet;
1454
1455 if (transport->rcvsize) {
1456 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1457 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1458 }
1459 if (transport->sndsize) {
1460 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1461 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1462 sk->sk_write_space(sk);
1463 }
1464 }
1465
1466 /**
1467 * xs_udp_set_buffer_size - set send and receive limits
1468 * @xprt: generic transport
1469 * @sndsize: requested size of send buffer, in bytes
1470 * @rcvsize: requested size of receive buffer, in bytes
1471 *
1472 * Set socket send and receive buffer size limits.
1473 */
1474 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1475 {
1476 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1477
1478 transport->sndsize = 0;
1479 if (sndsize)
1480 transport->sndsize = sndsize + 1024;
1481 transport->rcvsize = 0;
1482 if (rcvsize)
1483 transport->rcvsize = rcvsize + 1024;
1484
1485 xs_udp_do_set_buffer_size(xprt);
1486 }
1487
1488 /**
1489 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1490 * @task: task that timed out
1491 *
1492 * Adjust the congestion window after a retransmit timeout has occurred.
1493 */
1494 static void xs_udp_timer(struct rpc_task *task)
1495 {
1496 xprt_adjust_cwnd(task, -ETIMEDOUT);
1497 }
1498
1499 static unsigned short xs_get_random_port(void)
1500 {
1501 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1502 unsigned short rand = (unsigned short) net_random() % range;
1503 return rand + xprt_min_resvport;
1504 }
1505
1506 /**
1507 * xs_set_port - reset the port number in the remote endpoint address
1508 * @xprt: generic transport
1509 * @port: new port number
1510 *
1511 */
1512 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1513 {
1514 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1515
1516 rpc_set_port(xs_addr(xprt), port);
1517 xs_update_peer_port(xprt);
1518 }
1519
1520 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1521 {
1522 unsigned short port = transport->srcport;
1523
1524 if (port == 0 && transport->xprt.resvport)
1525 port = xs_get_random_port();
1526 return port;
1527 }
1528
1529 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1530 {
1531 if (transport->srcport != 0)
1532 transport->srcport = 0;
1533 if (!transport->xprt.resvport)
1534 return 0;
1535 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1536 return xprt_max_resvport;
1537 return --port;
1538 }
1539 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1540 {
1541 struct sockaddr_storage myaddr;
1542 int err, nloop = 0;
1543 unsigned short port = xs_get_srcport(transport);
1544 unsigned short last;
1545
1546 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1547 do {
1548 rpc_set_port((struct sockaddr *)&myaddr, port);
1549 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1550 transport->xprt.addrlen);
1551 if (port == 0)
1552 break;
1553 if (err == 0) {
1554 transport->srcport = port;
1555 break;
1556 }
1557 last = port;
1558 port = xs_next_srcport(transport, port);
1559 if (port > last)
1560 nloop++;
1561 } while (err == -EADDRINUSE && nloop != 2);
1562
1563 if (myaddr.ss_family == AF_INET)
1564 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1565 &((struct sockaddr_in *)&myaddr)->sin_addr,
1566 port, err ? "failed" : "ok", err);
1567 else
1568 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1569 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1570 port, err ? "failed" : "ok", err);
1571 return err;
1572 }
1573
1574
1575 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1576 static struct lock_class_key xs_key[2];
1577 static struct lock_class_key xs_slock_key[2];
1578
1579 static inline void xs_reclassify_socket4(struct socket *sock)
1580 {
1581 struct sock *sk = sock->sk;
1582
1583 BUG_ON(sock_owned_by_user(sk));
1584 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1585 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1586 }
1587
1588 static inline void xs_reclassify_socket6(struct socket *sock)
1589 {
1590 struct sock *sk = sock->sk;
1591
1592 BUG_ON(sock_owned_by_user(sk));
1593 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1594 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1595 }
1596
1597 static inline void xs_reclassify_socket(int family, struct socket *sock)
1598 {
1599 switch (family) {
1600 case AF_INET:
1601 xs_reclassify_socket4(sock);
1602 break;
1603 case AF_INET6:
1604 xs_reclassify_socket6(sock);
1605 break;
1606 }
1607 }
1608 #else
1609 static inline void xs_reclassify_socket4(struct socket *sock)
1610 {
1611 }
1612
1613 static inline void xs_reclassify_socket6(struct socket *sock)
1614 {
1615 }
1616
1617 static inline void xs_reclassify_socket(int family, struct socket *sock)
1618 {
1619 }
1620 #endif
1621
1622 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1623 struct sock_xprt *transport, int family, int type, int protocol)
1624 {
1625 struct socket *sock;
1626 int err;
1627
1628 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1629 if (err < 0) {
1630 dprintk("RPC: can't create %d transport socket (%d).\n",
1631 protocol, -err);
1632 goto out;
1633 }
1634 xs_reclassify_socket(family, sock);
1635
1636 err = xs_bind(transport, sock);
1637 if (err) {
1638 sock_release(sock);
1639 goto out;
1640 }
1641
1642 return sock;
1643 out:
1644 return ERR_PTR(err);
1645 }
1646
1647 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1648 {
1649 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1650
1651 if (!transport->inet) {
1652 struct sock *sk = sock->sk;
1653
1654 write_lock_bh(&sk->sk_callback_lock);
1655
1656 xs_save_old_callbacks(transport, sk);
1657
1658 sk->sk_user_data = xprt;
1659 sk->sk_data_ready = xs_udp_data_ready;
1660 sk->sk_write_space = xs_udp_write_space;
1661 sk->sk_error_report = xs_error_report;
1662 sk->sk_no_check = UDP_CSUM_NORCV;
1663 sk->sk_allocation = GFP_ATOMIC;
1664
1665 xprt_set_connected(xprt);
1666
1667 /* Reset to new socket */
1668 transport->sock = sock;
1669 transport->inet = sk;
1670
1671 write_unlock_bh(&sk->sk_callback_lock);
1672 }
1673 xs_udp_do_set_buffer_size(xprt);
1674 }
1675
1676 static void xs_udp_setup_socket(struct work_struct *work)
1677 {
1678 struct sock_xprt *transport =
1679 container_of(work, struct sock_xprt, connect_worker.work);
1680 struct rpc_xprt *xprt = &transport->xprt;
1681 struct socket *sock = transport->sock;
1682 int status = -EIO;
1683
1684 if (xprt->shutdown)
1685 goto out;
1686
1687 /* Start by resetting any existing state */
1688 xs_reset_transport(transport);
1689 sock = xs_create_sock(xprt, transport,
1690 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1691 if (IS_ERR(sock))
1692 goto out;
1693
1694 dprintk("RPC: worker connecting xprt %p via %s to "
1695 "%s (port %s)\n", xprt,
1696 xprt->address_strings[RPC_DISPLAY_PROTO],
1697 xprt->address_strings[RPC_DISPLAY_ADDR],
1698 xprt->address_strings[RPC_DISPLAY_PORT]);
1699
1700 xs_udp_finish_connecting(xprt, sock);
1701 status = 0;
1702 out:
1703 xprt_clear_connecting(xprt);
1704 xprt_wake_pending_tasks(xprt, status);
1705 }
1706
1707 /*
1708 * We need to preserve the port number so the reply cache on the server can
1709 * find our cached RPC replies when we get around to reconnecting.
1710 */
1711 static void xs_abort_connection(struct sock_xprt *transport)
1712 {
1713 int result;
1714 struct sockaddr any;
1715
1716 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
1717
1718 /*
1719 * Disconnect the transport socket by doing a connect operation
1720 * with AF_UNSPEC. This should return immediately...
1721 */
1722 memset(&any, 0, sizeof(any));
1723 any.sa_family = AF_UNSPEC;
1724 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1725 if (!result)
1726 xs_sock_mark_closed(&transport->xprt);
1727 else
1728 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1729 result);
1730 }
1731
1732 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
1733 {
1734 unsigned int state = transport->inet->sk_state;
1735
1736 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
1737 /* we don't need to abort the connection if the socket
1738 * hasn't undergone a shutdown
1739 */
1740 if (transport->inet->sk_shutdown == 0)
1741 return;
1742 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
1743 __func__, transport->inet->sk_shutdown);
1744 }
1745 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
1746 /* we don't need to abort the connection if the socket
1747 * hasn't undergone a shutdown
1748 */
1749 if (transport->inet->sk_shutdown == 0)
1750 return;
1751 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
1752 "sk_shutdown set to %d\n",
1753 __func__, transport->inet->sk_shutdown);
1754 }
1755 xs_abort_connection(transport);
1756 }
1757
1758 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1759 {
1760 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1761
1762 if (!transport->inet) {
1763 struct sock *sk = sock->sk;
1764
1765 write_lock_bh(&sk->sk_callback_lock);
1766
1767 xs_save_old_callbacks(transport, sk);
1768
1769 sk->sk_user_data = xprt;
1770 sk->sk_data_ready = xs_tcp_data_ready;
1771 sk->sk_state_change = xs_tcp_state_change;
1772 sk->sk_write_space = xs_tcp_write_space;
1773 sk->sk_error_report = xs_error_report;
1774 sk->sk_allocation = GFP_ATOMIC;
1775
1776 /* socket options */
1777 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1778 sock_reset_flag(sk, SOCK_LINGER);
1779 tcp_sk(sk)->linger2 = 0;
1780 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1781
1782 xprt_clear_connected(xprt);
1783
1784 /* Reset to new socket */
1785 transport->sock = sock;
1786 transport->inet = sk;
1787
1788 write_unlock_bh(&sk->sk_callback_lock);
1789 }
1790
1791 if (!xprt_bound(xprt))
1792 return -ENOTCONN;
1793
1794 /* Tell the socket layer to start connecting... */
1795 xprt->stat.connect_count++;
1796 xprt->stat.connect_start = jiffies;
1797 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1798 }
1799
1800 /**
1801 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1802 * @xprt: RPC transport to connect
1803 * @transport: socket transport to connect
1804 * @create_sock: function to create a socket of the correct type
1805 *
1806 * Invoked by a work queue tasklet.
1807 */
1808 static void xs_tcp_setup_socket(struct work_struct *work)
1809 {
1810 struct sock_xprt *transport =
1811 container_of(work, struct sock_xprt, connect_worker.work);
1812 struct socket *sock = transport->sock;
1813 struct rpc_xprt *xprt = &transport->xprt;
1814 int status = -EIO;
1815
1816 if (xprt->shutdown)
1817 goto out;
1818
1819 if (!sock) {
1820 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1821 sock = xs_create_sock(xprt, transport,
1822 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
1823 if (IS_ERR(sock)) {
1824 status = PTR_ERR(sock);
1825 goto out;
1826 }
1827 } else {
1828 int abort_and_exit;
1829
1830 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1831 &xprt->state);
1832 /* "close" the socket, preserving the local port */
1833 xs_tcp_reuse_connection(transport);
1834
1835 if (abort_and_exit)
1836 goto out_eagain;
1837 }
1838
1839 dprintk("RPC: worker connecting xprt %p via %s to "
1840 "%s (port %s)\n", xprt,
1841 xprt->address_strings[RPC_DISPLAY_PROTO],
1842 xprt->address_strings[RPC_DISPLAY_ADDR],
1843 xprt->address_strings[RPC_DISPLAY_PORT]);
1844
1845 status = xs_tcp_finish_connecting(xprt, sock);
1846 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1847 xprt, -status, xprt_connected(xprt),
1848 sock->sk->sk_state);
1849 switch (status) {
1850 default:
1851 printk("%s: connect returned unhandled error %d\n",
1852 __func__, status);
1853 case -EADDRNOTAVAIL:
1854 /* We're probably in TIME_WAIT. Get rid of existing socket,
1855 * and retry
1856 */
1857 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1858 xprt_force_disconnect(xprt);
1859 break;
1860 case -ECONNREFUSED:
1861 case -ECONNRESET:
1862 case -ENETUNREACH:
1863 /* retry with existing socket, after a delay */
1864 case 0:
1865 case -EINPROGRESS:
1866 case -EALREADY:
1867 xprt_clear_connecting(xprt);
1868 return;
1869 case -EINVAL:
1870 /* Happens, for instance, if the user specified a link
1871 * local IPv6 address without a scope-id.
1872 */
1873 goto out;
1874 }
1875 out_eagain:
1876 status = -EAGAIN;
1877 out:
1878 xprt_clear_connecting(xprt);
1879 xprt_wake_pending_tasks(xprt, status);
1880 }
1881
1882 /**
1883 * xs_connect - connect a socket to a remote endpoint
1884 * @task: address of RPC task that manages state of connect request
1885 *
1886 * TCP: If the remote end dropped the connection, delay reconnecting.
1887 *
1888 * UDP socket connects are synchronous, but we use a work queue anyway
1889 * to guarantee that even unprivileged user processes can set up a
1890 * socket on a privileged port.
1891 *
1892 * If a UDP socket connect fails, the delay behavior here prevents
1893 * retry floods (hard mounts).
1894 */
1895 static void xs_connect(struct rpc_task *task)
1896 {
1897 struct rpc_xprt *xprt = task->tk_xprt;
1898 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1899
1900 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
1901 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1902 "seconds\n",
1903 xprt, xprt->reestablish_timeout / HZ);
1904 queue_delayed_work(rpciod_workqueue,
1905 &transport->connect_worker,
1906 xprt->reestablish_timeout);
1907 xprt->reestablish_timeout <<= 1;
1908 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1909 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1910 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1911 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1912 } else {
1913 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1914 queue_delayed_work(rpciod_workqueue,
1915 &transport->connect_worker, 0);
1916 }
1917 }
1918
1919 /**
1920 * xs_udp_print_stats - display UDP socket-specifc stats
1921 * @xprt: rpc_xprt struct containing statistics
1922 * @seq: output file
1923 *
1924 */
1925 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1926 {
1927 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1928
1929 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1930 transport->srcport,
1931 xprt->stat.bind_count,
1932 xprt->stat.sends,
1933 xprt->stat.recvs,
1934 xprt->stat.bad_xids,
1935 xprt->stat.req_u,
1936 xprt->stat.bklog_u);
1937 }
1938
1939 /**
1940 * xs_tcp_print_stats - display TCP socket-specifc stats
1941 * @xprt: rpc_xprt struct containing statistics
1942 * @seq: output file
1943 *
1944 */
1945 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1946 {
1947 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1948 long idle_time = 0;
1949
1950 if (xprt_connected(xprt))
1951 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1952
1953 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1954 transport->srcport,
1955 xprt->stat.bind_count,
1956 xprt->stat.connect_count,
1957 xprt->stat.connect_time,
1958 idle_time,
1959 xprt->stat.sends,
1960 xprt->stat.recvs,
1961 xprt->stat.bad_xids,
1962 xprt->stat.req_u,
1963 xprt->stat.bklog_u);
1964 }
1965
1966 /*
1967 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
1968 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
1969 * to use the server side send routines.
1970 */
1971 static void *bc_malloc(struct rpc_task *task, size_t size)
1972 {
1973 struct page *page;
1974 struct rpc_buffer *buf;
1975
1976 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
1977 page = alloc_page(GFP_KERNEL);
1978
1979 if (!page)
1980 return NULL;
1981
1982 buf = page_address(page);
1983 buf->len = PAGE_SIZE;
1984
1985 return buf->data;
1986 }
1987
1988 /*
1989 * Free the space allocated in the bc_alloc routine
1990 */
1991 static void bc_free(void *buffer)
1992 {
1993 struct rpc_buffer *buf;
1994
1995 if (!buffer)
1996 return;
1997
1998 buf = container_of(buffer, struct rpc_buffer, data);
1999 free_page((unsigned long)buf);
2000 }
2001
2002 /*
2003 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2004 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2005 */
2006 static int bc_sendto(struct rpc_rqst *req)
2007 {
2008 int len;
2009 struct xdr_buf *xbufp = &req->rq_snd_buf;
2010 struct rpc_xprt *xprt = req->rq_xprt;
2011 struct sock_xprt *transport =
2012 container_of(xprt, struct sock_xprt, xprt);
2013 struct socket *sock = transport->sock;
2014 unsigned long headoff;
2015 unsigned long tailoff;
2016
2017 /*
2018 * Set up the rpc header and record marker stuff
2019 */
2020 xs_encode_tcp_record_marker(xbufp);
2021
2022 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2023 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2024 len = svc_send_common(sock, xbufp,
2025 virt_to_page(xbufp->head[0].iov_base), headoff,
2026 xbufp->tail[0].iov_base, tailoff);
2027
2028 if (len != xbufp->len) {
2029 printk(KERN_NOTICE "Error sending entire callback!\n");
2030 len = -EAGAIN;
2031 }
2032
2033 return len;
2034 }
2035
2036 /*
2037 * The send routine. Borrows from svc_send
2038 */
2039 static int bc_send_request(struct rpc_task *task)
2040 {
2041 struct rpc_rqst *req = task->tk_rqstp;
2042 struct svc_xprt *xprt;
2043 struct svc_sock *svsk;
2044 u32 len;
2045
2046 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2047 /*
2048 * Get the server socket associated with this callback xprt
2049 */
2050 xprt = req->rq_xprt->bc_xprt;
2051 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2052
2053 /*
2054 * Grab the mutex to serialize data as the connection is shared
2055 * with the fore channel
2056 */
2057 if (!mutex_trylock(&xprt->xpt_mutex)) {
2058 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2059 if (!mutex_trylock(&xprt->xpt_mutex))
2060 return -EAGAIN;
2061 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2062 }
2063 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2064 len = -ENOTCONN;
2065 else
2066 len = bc_sendto(req);
2067 mutex_unlock(&xprt->xpt_mutex);
2068
2069 if (len > 0)
2070 len = 0;
2071
2072 return len;
2073 }
2074
2075 /*
2076 * The close routine. Since this is client initiated, we do nothing
2077 */
2078
2079 static void bc_close(struct rpc_xprt *xprt)
2080 {
2081 }
2082
2083 /*
2084 * The xprt destroy routine. Again, because this connection is client
2085 * initiated, we do nothing
2086 */
2087
2088 static void bc_destroy(struct rpc_xprt *xprt)
2089 {
2090 }
2091
2092 static struct rpc_xprt_ops xs_udp_ops = {
2093 .set_buffer_size = xs_udp_set_buffer_size,
2094 .reserve_xprt = xprt_reserve_xprt_cong,
2095 .release_xprt = xprt_release_xprt_cong,
2096 .rpcbind = rpcb_getport_async,
2097 .set_port = xs_set_port,
2098 .connect = xs_connect,
2099 .buf_alloc = rpc_malloc,
2100 .buf_free = rpc_free,
2101 .send_request = xs_udp_send_request,
2102 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2103 .timer = xs_udp_timer,
2104 .release_request = xprt_release_rqst_cong,
2105 .close = xs_close,
2106 .destroy = xs_destroy,
2107 .print_stats = xs_udp_print_stats,
2108 };
2109
2110 static struct rpc_xprt_ops xs_tcp_ops = {
2111 .reserve_xprt = xprt_reserve_xprt,
2112 .release_xprt = xs_tcp_release_xprt,
2113 .rpcbind = rpcb_getport_async,
2114 .set_port = xs_set_port,
2115 .connect = xs_connect,
2116 .buf_alloc = rpc_malloc,
2117 .buf_free = rpc_free,
2118 .send_request = xs_tcp_send_request,
2119 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2120 .close = xs_tcp_close,
2121 .destroy = xs_destroy,
2122 .print_stats = xs_tcp_print_stats,
2123 };
2124
2125 /*
2126 * The rpc_xprt_ops for the server backchannel
2127 */
2128
2129 static struct rpc_xprt_ops bc_tcp_ops = {
2130 .reserve_xprt = xprt_reserve_xprt,
2131 .release_xprt = xprt_release_xprt,
2132 .buf_alloc = bc_malloc,
2133 .buf_free = bc_free,
2134 .send_request = bc_send_request,
2135 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2136 .close = bc_close,
2137 .destroy = bc_destroy,
2138 .print_stats = xs_tcp_print_stats,
2139 };
2140
2141 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2142 {
2143 static const struct sockaddr_in sin = {
2144 .sin_family = AF_INET,
2145 .sin_addr.s_addr = htonl(INADDR_ANY),
2146 };
2147 static const struct sockaddr_in6 sin6 = {
2148 .sin6_family = AF_INET6,
2149 .sin6_addr = IN6ADDR_ANY_INIT,
2150 };
2151
2152 switch (family) {
2153 case AF_INET:
2154 memcpy(sap, &sin, sizeof(sin));
2155 break;
2156 case AF_INET6:
2157 memcpy(sap, &sin6, sizeof(sin6));
2158 break;
2159 default:
2160 dprintk("RPC: %s: Bad address family\n", __func__);
2161 return -EAFNOSUPPORT;
2162 }
2163 return 0;
2164 }
2165
2166 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2167 unsigned int slot_table_size)
2168 {
2169 struct rpc_xprt *xprt;
2170 struct sock_xprt *new;
2171
2172 if (args->addrlen > sizeof(xprt->addr)) {
2173 dprintk("RPC: xs_setup_xprt: address too large\n");
2174 return ERR_PTR(-EBADF);
2175 }
2176
2177 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size);
2178 if (xprt == NULL) {
2179 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2180 "rpc_xprt\n");
2181 return ERR_PTR(-ENOMEM);
2182 }
2183
2184 new = container_of(xprt, struct sock_xprt, xprt);
2185 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2186 xprt->addrlen = args->addrlen;
2187 if (args->srcaddr)
2188 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2189 else {
2190 int err;
2191 err = xs_init_anyaddr(args->dstaddr->sa_family,
2192 (struct sockaddr *)&new->srcaddr);
2193 if (err != 0)
2194 return ERR_PTR(err);
2195 }
2196
2197 return xprt;
2198 }
2199
2200 static const struct rpc_timeout xs_udp_default_timeout = {
2201 .to_initval = 5 * HZ,
2202 .to_maxval = 30 * HZ,
2203 .to_increment = 5 * HZ,
2204 .to_retries = 5,
2205 };
2206
2207 /**
2208 * xs_setup_udp - Set up transport to use a UDP socket
2209 * @args: rpc transport creation arguments
2210 *
2211 */
2212 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2213 {
2214 struct sockaddr *addr = args->dstaddr;
2215 struct rpc_xprt *xprt;
2216 struct sock_xprt *transport;
2217 struct rpc_xprt *ret;
2218
2219 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2220 if (IS_ERR(xprt))
2221 return xprt;
2222 transport = container_of(xprt, struct sock_xprt, xprt);
2223
2224 xprt->prot = IPPROTO_UDP;
2225 xprt->tsh_size = 0;
2226 /* XXX: header size can vary due to auth type, IPv6, etc. */
2227 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2228
2229 xprt->bind_timeout = XS_BIND_TO;
2230 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2231 xprt->idle_timeout = XS_IDLE_DISC_TO;
2232
2233 xprt->ops = &xs_udp_ops;
2234
2235 xprt->timeout = &xs_udp_default_timeout;
2236
2237 switch (addr->sa_family) {
2238 case AF_INET:
2239 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2240 xprt_set_bound(xprt);
2241
2242 INIT_DELAYED_WORK(&transport->connect_worker,
2243 xs_udp_setup_socket);
2244 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2245 break;
2246 case AF_INET6:
2247 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2248 xprt_set_bound(xprt);
2249
2250 INIT_DELAYED_WORK(&transport->connect_worker,
2251 xs_udp_setup_socket);
2252 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2253 break;
2254 default:
2255 ret = ERR_PTR(-EAFNOSUPPORT);
2256 goto out_err;
2257 }
2258
2259 if (xprt_bound(xprt))
2260 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2261 xprt->address_strings[RPC_DISPLAY_ADDR],
2262 xprt->address_strings[RPC_DISPLAY_PORT],
2263 xprt->address_strings[RPC_DISPLAY_PROTO]);
2264 else
2265 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2266 xprt->address_strings[RPC_DISPLAY_ADDR],
2267 xprt->address_strings[RPC_DISPLAY_PROTO]);
2268
2269 if (try_module_get(THIS_MODULE))
2270 return xprt;
2271 ret = ERR_PTR(-EINVAL);
2272 out_err:
2273 xprt_free(xprt);
2274 return ret;
2275 }
2276
2277 static const struct rpc_timeout xs_tcp_default_timeout = {
2278 .to_initval = 60 * HZ,
2279 .to_maxval = 60 * HZ,
2280 .to_retries = 2,
2281 };
2282
2283 /**
2284 * xs_setup_tcp - Set up transport to use a TCP socket
2285 * @args: rpc transport creation arguments
2286 *
2287 */
2288 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2289 {
2290 struct sockaddr *addr = args->dstaddr;
2291 struct rpc_xprt *xprt;
2292 struct sock_xprt *transport;
2293 struct rpc_xprt *ret;
2294
2295 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2296 if (IS_ERR(xprt))
2297 return xprt;
2298 transport = container_of(xprt, struct sock_xprt, xprt);
2299
2300 xprt->prot = IPPROTO_TCP;
2301 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2302 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2303
2304 xprt->bind_timeout = XS_BIND_TO;
2305 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2306 xprt->idle_timeout = XS_IDLE_DISC_TO;
2307
2308 xprt->ops = &xs_tcp_ops;
2309 xprt->timeout = &xs_tcp_default_timeout;
2310
2311 switch (addr->sa_family) {
2312 case AF_INET:
2313 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2314 xprt_set_bound(xprt);
2315
2316 INIT_DELAYED_WORK(&transport->connect_worker,
2317 xs_tcp_setup_socket);
2318 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2319 break;
2320 case AF_INET6:
2321 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2322 xprt_set_bound(xprt);
2323
2324 INIT_DELAYED_WORK(&transport->connect_worker,
2325 xs_tcp_setup_socket);
2326 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2327 break;
2328 default:
2329 ret = ERR_PTR(-EAFNOSUPPORT);
2330 goto out_err;
2331 }
2332
2333 if (xprt_bound(xprt))
2334 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2335 xprt->address_strings[RPC_DISPLAY_ADDR],
2336 xprt->address_strings[RPC_DISPLAY_PORT],
2337 xprt->address_strings[RPC_DISPLAY_PROTO]);
2338 else
2339 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2340 xprt->address_strings[RPC_DISPLAY_ADDR],
2341 xprt->address_strings[RPC_DISPLAY_PROTO]);
2342
2343
2344 if (try_module_get(THIS_MODULE))
2345 return xprt;
2346 ret = ERR_PTR(-EINVAL);
2347 out_err:
2348 xprt_free(xprt);
2349 return ret;
2350 }
2351
2352 /**
2353 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2354 * @args: rpc transport creation arguments
2355 *
2356 */
2357 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2358 {
2359 struct sockaddr *addr = args->dstaddr;
2360 struct rpc_xprt *xprt;
2361 struct sock_xprt *transport;
2362 struct svc_sock *bc_sock;
2363 struct rpc_xprt *ret;
2364
2365 if (args->bc_xprt->xpt_bc_xprt) {
2366 /*
2367 * This server connection already has a backchannel
2368 * export; we can't create a new one, as we wouldn't be
2369 * able to match replies based on xid any more. So,
2370 * reuse the already-existing one:
2371 */
2372 return args->bc_xprt->xpt_bc_xprt;
2373 }
2374 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2375 if (IS_ERR(xprt))
2376 return xprt;
2377 transport = container_of(xprt, struct sock_xprt, xprt);
2378
2379 xprt->prot = IPPROTO_TCP;
2380 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2381 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2382 xprt->timeout = &xs_tcp_default_timeout;
2383
2384 /* backchannel */
2385 xprt_set_bound(xprt);
2386 xprt->bind_timeout = 0;
2387 xprt->reestablish_timeout = 0;
2388 xprt->idle_timeout = 0;
2389
2390 xprt->ops = &bc_tcp_ops;
2391
2392 switch (addr->sa_family) {
2393 case AF_INET:
2394 xs_format_peer_addresses(xprt, "tcp",
2395 RPCBIND_NETID_TCP);
2396 break;
2397 case AF_INET6:
2398 xs_format_peer_addresses(xprt, "tcp",
2399 RPCBIND_NETID_TCP6);
2400 break;
2401 default:
2402 ret = ERR_PTR(-EAFNOSUPPORT);
2403 goto out_err;
2404 }
2405
2406 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2407 xprt->address_strings[RPC_DISPLAY_ADDR],
2408 xprt->address_strings[RPC_DISPLAY_PORT],
2409 xprt->address_strings[RPC_DISPLAY_PROTO]);
2410
2411 /*
2412 * Once we've associated a backchannel xprt with a connection,
2413 * we want to keep it around as long as long as the connection
2414 * lasts, in case we need to start using it for a backchannel
2415 * again; this reference won't be dropped until bc_xprt is
2416 * destroyed.
2417 */
2418 xprt_get(xprt);
2419 args->bc_xprt->xpt_bc_xprt = xprt;
2420 xprt->bc_xprt = args->bc_xprt;
2421 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2422 transport->sock = bc_sock->sk_sock;
2423 transport->inet = bc_sock->sk_sk;
2424
2425 /*
2426 * Since we don't want connections for the backchannel, we set
2427 * the xprt status to connected
2428 */
2429 xprt_set_connected(xprt);
2430
2431
2432 if (try_module_get(THIS_MODULE))
2433 return xprt;
2434 xprt_put(xprt);
2435 ret = ERR_PTR(-EINVAL);
2436 out_err:
2437 xprt_free(xprt);
2438 return ret;
2439 }
2440
2441 static struct xprt_class xs_udp_transport = {
2442 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2443 .name = "udp",
2444 .owner = THIS_MODULE,
2445 .ident = XPRT_TRANSPORT_UDP,
2446 .setup = xs_setup_udp,
2447 };
2448
2449 static struct xprt_class xs_tcp_transport = {
2450 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2451 .name = "tcp",
2452 .owner = THIS_MODULE,
2453 .ident = XPRT_TRANSPORT_TCP,
2454 .setup = xs_setup_tcp,
2455 };
2456
2457 static struct xprt_class xs_bc_tcp_transport = {
2458 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2459 .name = "tcp NFSv4.1 backchannel",
2460 .owner = THIS_MODULE,
2461 .ident = XPRT_TRANSPORT_BC_TCP,
2462 .setup = xs_setup_bc_tcp,
2463 };
2464
2465 /**
2466 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2467 *
2468 */
2469 int init_socket_xprt(void)
2470 {
2471 #ifdef RPC_DEBUG
2472 if (!sunrpc_table_header)
2473 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2474 #endif
2475
2476 xprt_register_transport(&xs_udp_transport);
2477 xprt_register_transport(&xs_tcp_transport);
2478 xprt_register_transport(&xs_bc_tcp_transport);
2479
2480 return 0;
2481 }
2482
2483 /**
2484 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2485 *
2486 */
2487 void cleanup_socket_xprt(void)
2488 {
2489 #ifdef RPC_DEBUG
2490 if (sunrpc_table_header) {
2491 unregister_sysctl_table(sunrpc_table_header);
2492 sunrpc_table_header = NULL;
2493 }
2494 #endif
2495
2496 xprt_unregister_transport(&xs_udp_transport);
2497 xprt_unregister_transport(&xs_tcp_transport);
2498 xprt_unregister_transport(&xs_bc_tcp_transport);
2499 }
2500
2501 static int param_set_uint_minmax(const char *val,
2502 const struct kernel_param *kp,
2503 unsigned int min, unsigned int max)
2504 {
2505 unsigned long num;
2506 int ret;
2507
2508 if (!val)
2509 return -EINVAL;
2510 ret = strict_strtoul(val, 0, &num);
2511 if (ret == -EINVAL || num < min || num > max)
2512 return -EINVAL;
2513 *((unsigned int *)kp->arg) = num;
2514 return 0;
2515 }
2516
2517 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2518 {
2519 return param_set_uint_minmax(val, kp,
2520 RPC_MIN_RESVPORT,
2521 RPC_MAX_RESVPORT);
2522 }
2523
2524 static struct kernel_param_ops param_ops_portnr = {
2525 .set = param_set_portnr,
2526 .get = param_get_uint,
2527 };
2528
2529 #define param_check_portnr(name, p) \
2530 __param_check(name, p, unsigned int);
2531
2532 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2533 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2534
2535 static int param_set_slot_table_size(const char *val,
2536 const struct kernel_param *kp)
2537 {
2538 return param_set_uint_minmax(val, kp,
2539 RPC_MIN_SLOT_TABLE,
2540 RPC_MAX_SLOT_TABLE);
2541 }
2542
2543 static struct kernel_param_ops param_ops_slot_table_size = {
2544 .set = param_set_slot_table_size,
2545 .get = param_get_uint,
2546 };
2547
2548 #define param_check_slot_table_size(name, p) \
2549 __param_check(name, p, unsigned int);
2550
2551 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2552 slot_table_size, 0644);
2553 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2554 slot_table_size, 0644);
2555
CRIS linux kernel tree