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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6.git] / net / sunrpc / xprtsock.c
blobffd50348a509e392fa2255f17f35a9291239e91c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/net.h>
31 #include <linux/mm.h>
32 #include <linux/un.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/sched.h>
38 #include <linux/sunrpc/svcsock.h>
39 #include <linux/sunrpc/xprtsock.h>
40 #include <linux/file.h>
41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
42 #include <linux/sunrpc/bc_xprt.h>
43 #endif
44
45 #include <net/sock.h>
46 #include <net/checksum.h>
47 #include <net/udp.h>
48 #include <net/tcp.h>
49
50 #include "sunrpc.h"
51
52 static void xs_close(struct rpc_xprt *xprt);
53
54 /*
55 * xprtsock tunables
56 */
57 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
58 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
59 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
60
61 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
62 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
63
64 #define XS_TCP_LINGER_TO (15U * HZ)
65 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
66
67 /*
68 * We can register our own files under /proc/sys/sunrpc by
69 * calling register_sysctl_table() again. The files in that
70 * directory become the union of all files registered there.
71 *
72 * We simply need to make sure that we don't collide with
73 * someone else's file names!
74 */
75
76 #ifdef RPC_DEBUG
77
78 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
79 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
80 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
81 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
82 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
83
84 static struct ctl_table_header *sunrpc_table_header;
85
86 /*
87 * FIXME: changing the UDP slot table size should also resize the UDP
88 * socket buffers for existing UDP transports
89 */
90 static ctl_table xs_tunables_table[] = {
91 {
92 .procname = "udp_slot_table_entries",
93 .data = &xprt_udp_slot_table_entries,
94 .maxlen = sizeof(unsigned int),
95 .mode = 0644,
96 .proc_handler = proc_dointvec_minmax,
97 .extra1 = &min_slot_table_size,
98 .extra2 = &max_slot_table_size
99 },
100 {
101 .procname = "tcp_slot_table_entries",
102 .data = &xprt_tcp_slot_table_entries,
103 .maxlen = sizeof(unsigned int),
104 .mode = 0644,
105 .proc_handler = proc_dointvec_minmax,
106 .extra1 = &min_slot_table_size,
107 .extra2 = &max_slot_table_size
108 },
109 {
110 .procname = "tcp_max_slot_table_entries",
111 .data = &xprt_max_tcp_slot_table_entries,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = proc_dointvec_minmax,
115 .extra1 = &min_slot_table_size,
116 .extra2 = &max_tcp_slot_table_limit
117 },
118 {
119 .procname = "min_resvport",
120 .data = &xprt_min_resvport,
121 .maxlen = sizeof(unsigned int),
122 .mode = 0644,
123 .proc_handler = proc_dointvec_minmax,
124 .extra1 = &xprt_min_resvport_limit,
125 .extra2 = &xprt_max_resvport_limit
126 },
127 {
128 .procname = "max_resvport",
129 .data = &xprt_max_resvport,
130 .maxlen = sizeof(unsigned int),
131 .mode = 0644,
132 .proc_handler = proc_dointvec_minmax,
133 .extra1 = &xprt_min_resvport_limit,
134 .extra2 = &xprt_max_resvport_limit
135 },
136 {
137 .procname = "tcp_fin_timeout",
138 .data = &xs_tcp_fin_timeout,
139 .maxlen = sizeof(xs_tcp_fin_timeout),
140 .mode = 0644,
141 .proc_handler = proc_dointvec_jiffies,
142 },
143 { },
144 };
145
146 static ctl_table sunrpc_table[] = {
147 {
148 .procname = "sunrpc",
149 .mode = 0555,
150 .child = xs_tunables_table
151 },
152 { },
153 };
154
155 #endif
156
157 /*
158 * Wait duration for a reply from the RPC portmapper.
159 */
160 #define XS_BIND_TO (60U * HZ)
161
162 /*
163 * Delay if a UDP socket connect error occurs. This is most likely some
164 * kind of resource problem on the local host.
165 */
166 #define XS_UDP_REEST_TO (2U * HZ)
167
168 /*
169 * The reestablish timeout allows clients to delay for a bit before attempting
170 * to reconnect to a server that just dropped our connection.
171 *
172 * We implement an exponential backoff when trying to reestablish a TCP
173 * transport connection with the server. Some servers like to drop a TCP
174 * connection when they are overworked, so we start with a short timeout and
175 * increase over time if the server is down or not responding.
176 */
177 #define XS_TCP_INIT_REEST_TO (3U * HZ)
178 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
179
180 /*
181 * TCP idle timeout; client drops the transport socket if it is idle
182 * for this long. Note that we also timeout UDP sockets to prevent
183 * holding port numbers when there is no RPC traffic.
184 */
185 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
186
187 #ifdef RPC_DEBUG
188 # undef RPC_DEBUG_DATA
189 # define RPCDBG_FACILITY RPCDBG_TRANS
190 #endif
191
192 #ifdef RPC_DEBUG_DATA
193 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
194 {
195 u8 *buf = (u8 *) packet;
196 int j;
197
198 dprintk("RPC: %s\n", msg);
199 for (j = 0; j < count && j < 128; j += 4) {
200 if (!(j & 31)) {
201 if (j)
202 dprintk("\n");
203 dprintk("0x%04x ", j);
204 }
205 dprintk("%02x%02x%02x%02x ",
206 buf[j], buf[j+1], buf[j+2], buf[j+3]);
207 }
208 dprintk("\n");
209 }
210 #else
211 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
212 {
213 /* NOP */
214 }
215 #endif
216
217 struct sock_xprt {
218 struct rpc_xprt xprt;
219
220 /*
221 * Network layer
222 */
223 struct socket * sock;
224 struct sock * inet;
225
226 /*
227 * State of TCP reply receive
228 */
229 __be32 tcp_fraghdr,
230 tcp_xid,
231 tcp_calldir;
232
233 u32 tcp_offset,
234 tcp_reclen;
235
236 unsigned long tcp_copied,
237 tcp_flags;
238
239 /*
240 * Connection of transports
241 */
242 struct delayed_work connect_worker;
243 struct sockaddr_storage srcaddr;
244 unsigned short srcport;
245
246 /*
247 * UDP socket buffer size parameters
248 */
249 size_t rcvsize,
250 sndsize;
251
252 /*
253 * Saved socket callback addresses
254 */
255 void (*old_data_ready)(struct sock *, int);
256 void (*old_state_change)(struct sock *);
257 void (*old_write_space)(struct sock *);
258 };
259
260 /*
261 * TCP receive state flags
262 */
263 #define TCP_RCV_LAST_FRAG (1UL << 0)
264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265 #define TCP_RCV_COPY_XID (1UL << 2)
266 #define TCP_RCV_COPY_DATA (1UL << 3)
267 #define TCP_RCV_READ_CALLDIR (1UL << 4)
268 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
269
270 /*
271 * TCP RPC flags
272 */
273 #define TCP_RPC_REPLY (1UL << 6)
274
275 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
276 {
277 return (struct sockaddr *) &xprt->addr;
278 }
279
280 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
281 {
282 return (struct sockaddr_un *) &xprt->addr;
283 }
284
285 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
286 {
287 return (struct sockaddr_in *) &xprt->addr;
288 }
289
290 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
291 {
292 return (struct sockaddr_in6 *) &xprt->addr;
293 }
294
295 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
296 {
297 struct sockaddr *sap = xs_addr(xprt);
298 struct sockaddr_in6 *sin6;
299 struct sockaddr_in *sin;
300 struct sockaddr_un *sun;
301 char buf[128];
302
303 switch (sap->sa_family) {
304 case AF_LOCAL:
305 sun = xs_addr_un(xprt);
306 strlcpy(buf, sun->sun_path, sizeof(buf));
307 xprt->address_strings[RPC_DISPLAY_ADDR] =
308 kstrdup(buf, GFP_KERNEL);
309 break;
310 case AF_INET:
311 (void)rpc_ntop(sap, buf, sizeof(buf));
312 xprt->address_strings[RPC_DISPLAY_ADDR] =
313 kstrdup(buf, GFP_KERNEL);
314 sin = xs_addr_in(xprt);
315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
316 break;
317 case AF_INET6:
318 (void)rpc_ntop(sap, buf, sizeof(buf));
319 xprt->address_strings[RPC_DISPLAY_ADDR] =
320 kstrdup(buf, GFP_KERNEL);
321 sin6 = xs_addr_in6(xprt);
322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
323 break;
324 default:
325 BUG();
326 }
327
328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
329 }
330
331 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
332 {
333 struct sockaddr *sap = xs_addr(xprt);
334 char buf[128];
335
336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
338
339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
341 }
342
343 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
344 const char *protocol,
345 const char *netid)
346 {
347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
348 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
349 xs_format_common_peer_addresses(xprt);
350 xs_format_common_peer_ports(xprt);
351 }
352
353 static void xs_update_peer_port(struct rpc_xprt *xprt)
354 {
355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
357
358 xs_format_common_peer_ports(xprt);
359 }
360
361 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
362 {
363 unsigned int i;
364
365 for (i = 0; i < RPC_DISPLAY_MAX; i++)
366 switch (i) {
367 case RPC_DISPLAY_PROTO:
368 case RPC_DISPLAY_NETID:
369 continue;
370 default:
371 kfree(xprt->address_strings[i]);
372 }
373 }
374
375 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
376
377 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
378 {
379 struct msghdr msg = {
380 .msg_name = addr,
381 .msg_namelen = addrlen,
382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
383 };
384 struct kvec iov = {
385 .iov_base = vec->iov_base + base,
386 .iov_len = vec->iov_len - base,
387 };
388
389 if (iov.iov_len != 0)
390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
391 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
392 }
393
394 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
395 {
396 struct page **ppage;
397 unsigned int remainder;
398 int err, sent = 0;
399
400 remainder = xdr->page_len - base;
401 base += xdr->page_base;
402 ppage = xdr->pages + (base >> PAGE_SHIFT);
403 base &= ~PAGE_MASK;
404 for(;;) {
405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
406 int flags = XS_SENDMSG_FLAGS;
407
408 remainder -= len;
409 if (remainder != 0 || more)
410 flags |= MSG_MORE;
411 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
412 if (remainder == 0 || err != len)
413 break;
414 sent += err;
415 ppage++;
416 base = 0;
417 }
418 if (sent == 0)
419 return err;
420 if (err > 0)
421 sent += err;
422 return sent;
423 }
424
425 /**
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
432 *
433 */
434 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
435 {
436 unsigned int remainder = xdr->len - base;
437 int err, sent = 0;
438
439 if (unlikely(!sock))
440 return -ENOTSOCK;
441
442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
443 if (base != 0) {
444 addr = NULL;
445 addrlen = 0;
446 }
447
448 if (base < xdr->head[0].iov_len || addr != NULL) {
449 unsigned int len = xdr->head[0].iov_len - base;
450 remainder -= len;
451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
452 if (remainder == 0 || err != len)
453 goto out;
454 sent += err;
455 base = 0;
456 } else
457 base -= xdr->head[0].iov_len;
458
459 if (base < xdr->page_len) {
460 unsigned int len = xdr->page_len - base;
461 remainder -= len;
462 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
463 if (remainder == 0 || err != len)
464 goto out;
465 sent += err;
466 base = 0;
467 } else
468 base -= xdr->page_len;
469
470 if (base >= xdr->tail[0].iov_len)
471 return sent;
472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
473 out:
474 if (sent == 0)
475 return err;
476 if (err > 0)
477 sent += err;
478 return sent;
479 }
480
481 static void xs_nospace_callback(struct rpc_task *task)
482 {
483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
484
485 transport->inet->sk_write_pending--;
486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
487 }
488
489 /**
490 * xs_nospace - place task on wait queue if transmit was incomplete
491 * @task: task to put to sleep
492 *
493 */
494 static int xs_nospace(struct rpc_task *task)
495 {
496 struct rpc_rqst *req = task->tk_rqstp;
497 struct rpc_xprt *xprt = req->rq_xprt;
498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
499 int ret = -EAGAIN;
500
501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
502 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
503 req->rq_slen);
504
505 /* Protect against races with write_space */
506 spin_lock_bh(&xprt->transport_lock);
507
508 /* Don't race with disconnect */
509 if (xprt_connected(xprt)) {
510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
511 /*
512 * Notify TCP that we're limited by the application
513 * window size
514 */
515 set_bit(SOCK_NOSPACE, &transport->sock->flags);
516 transport->inet->sk_write_pending++;
517 /* ...and wait for more buffer space */
518 xprt_wait_for_buffer_space(task, xs_nospace_callback);
519 }
520 } else {
521 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
522 ret = -ENOTCONN;
523 }
524
525 spin_unlock_bh(&xprt->transport_lock);
526 return ret;
527 }
528
529 /*
530 * Construct a stream transport record marker in @buf.
531 */
532 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
533 {
534 u32 reclen = buf->len - sizeof(rpc_fraghdr);
535 rpc_fraghdr *base = buf->head[0].iov_base;
536 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
537 }
538
539 /**
540 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
541 * @task: RPC task that manages the state of an RPC request
542 *
543 * Return values:
544 * 0: The request has been sent
545 * EAGAIN: The socket was blocked, please call again later to
546 * complete the request
547 * ENOTCONN: Caller needs to invoke connect logic then call again
548 * other: Some other error occured, the request was not sent
549 */
550 static int xs_local_send_request(struct rpc_task *task)
551 {
552 struct rpc_rqst *req = task->tk_rqstp;
553 struct rpc_xprt *xprt = req->rq_xprt;
554 struct sock_xprt *transport =
555 container_of(xprt, struct sock_xprt, xprt);
556 struct xdr_buf *xdr = &req->rq_snd_buf;
557 int status;
558
559 xs_encode_stream_record_marker(&req->rq_snd_buf);
560
561 xs_pktdump("packet data:",
562 req->rq_svec->iov_base, req->rq_svec->iov_len);
563
564 status = xs_sendpages(transport->sock, NULL, 0,
565 xdr, req->rq_bytes_sent);
566 dprintk("RPC: %s(%u) = %d\n",
567 __func__, xdr->len - req->rq_bytes_sent, status);
568 if (likely(status >= 0)) {
569 req->rq_bytes_sent += status;
570 req->rq_xmit_bytes_sent += status;
571 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
572 req->rq_bytes_sent = 0;
573 return 0;
574 }
575 status = -EAGAIN;
576 }
577
578 switch (status) {
579 case -EAGAIN:
580 status = xs_nospace(task);
581 break;
582 default:
583 dprintk("RPC: sendmsg returned unrecognized error %d\n",
584 -status);
585 case -EPIPE:
586 xs_close(xprt);
587 status = -ENOTCONN;
588 }
589
590 return status;
591 }
592
593 /**
594 * xs_udp_send_request - write an RPC request to a UDP socket
595 * @task: address of RPC task that manages the state of an RPC request
596 *
597 * Return values:
598 * 0: The request has been sent
599 * EAGAIN: The socket was blocked, please call again later to
600 * complete the request
601 * ENOTCONN: Caller needs to invoke connect logic then call again
602 * other: Some other error occurred, the request was not sent
603 */
604 static int xs_udp_send_request(struct rpc_task *task)
605 {
606 struct rpc_rqst *req = task->tk_rqstp;
607 struct rpc_xprt *xprt = req->rq_xprt;
608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
609 struct xdr_buf *xdr = &req->rq_snd_buf;
610 int status;
611
612 xs_pktdump("packet data:",
613 req->rq_svec->iov_base,
614 req->rq_svec->iov_len);
615
616 if (!xprt_bound(xprt))
617 return -ENOTCONN;
618 status = xs_sendpages(transport->sock,
619 xs_addr(xprt),
620 xprt->addrlen, xdr,
621 req->rq_bytes_sent);
622
623 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
624 xdr->len - req->rq_bytes_sent, status);
625
626 if (status >= 0) {
627 req->rq_xmit_bytes_sent += status;
628 if (status >= req->rq_slen)
629 return 0;
630 /* Still some bytes left; set up for a retry later. */
631 status = -EAGAIN;
632 }
633
634 switch (status) {
635 case -ENOTSOCK:
636 status = -ENOTCONN;
637 /* Should we call xs_close() here? */
638 break;
639 case -EAGAIN:
640 status = xs_nospace(task);
641 break;
642 default:
643 dprintk("RPC: sendmsg returned unrecognized error %d\n",
644 -status);
645 case -ENETUNREACH:
646 case -EPIPE:
647 case -ECONNREFUSED:
648 /* When the server has died, an ICMP port unreachable message
649 * prompts ECONNREFUSED. */
650 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
651 }
652
653 return status;
654 }
655
656 /**
657 * xs_tcp_shutdown - gracefully shut down a TCP socket
658 * @xprt: transport
659 *
660 * Initiates a graceful shutdown of the TCP socket by calling the
661 * equivalent of shutdown(SHUT_WR);
662 */
663 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
664 {
665 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
666 struct socket *sock = transport->sock;
667
668 if (sock != NULL)
669 kernel_sock_shutdown(sock, SHUT_WR);
670 }
671
672 /**
673 * xs_tcp_send_request - write an RPC request to a TCP socket
674 * @task: address of RPC task that manages the state of an RPC request
675 *
676 * Return values:
677 * 0: The request has been sent
678 * EAGAIN: The socket was blocked, please call again later to
679 * complete the request
680 * ENOTCONN: Caller needs to invoke connect logic then call again
681 * other: Some other error occurred, the request was not sent
682 *
683 * XXX: In the case of soft timeouts, should we eventually give up
684 * if sendmsg is not able to make progress?
685 */
686 static int xs_tcp_send_request(struct rpc_task *task)
687 {
688 struct rpc_rqst *req = task->tk_rqstp;
689 struct rpc_xprt *xprt = req->rq_xprt;
690 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
691 struct xdr_buf *xdr = &req->rq_snd_buf;
692 int status;
693
694 xs_encode_stream_record_marker(&req->rq_snd_buf);
695
696 xs_pktdump("packet data:",
697 req->rq_svec->iov_base,
698 req->rq_svec->iov_len);
699
700 /* Continue transmitting the packet/record. We must be careful
701 * to cope with writespace callbacks arriving _after_ we have
702 * called sendmsg(). */
703 while (1) {
704 status = xs_sendpages(transport->sock,
705 NULL, 0, xdr, req->rq_bytes_sent);
706
707 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
708 xdr->len - req->rq_bytes_sent, status);
709
710 if (unlikely(status < 0))
711 break;
712
713 /* If we've sent the entire packet, immediately
714 * reset the count of bytes sent. */
715 req->rq_bytes_sent += status;
716 req->rq_xmit_bytes_sent += status;
717 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
718 req->rq_bytes_sent = 0;
719 return 0;
720 }
721
722 if (status != 0)
723 continue;
724 status = -EAGAIN;
725 break;
726 }
727
728 switch (status) {
729 case -ENOTSOCK:
730 status = -ENOTCONN;
731 /* Should we call xs_close() here? */
732 break;
733 case -EAGAIN:
734 status = xs_nospace(task);
735 break;
736 default:
737 dprintk("RPC: sendmsg returned unrecognized error %d\n",
738 -status);
739 case -ECONNRESET:
740 xs_tcp_shutdown(xprt);
741 case -ECONNREFUSED:
742 case -ENOTCONN:
743 case -EPIPE:
744 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
745 }
746
747 return status;
748 }
749
750 /**
751 * xs_tcp_release_xprt - clean up after a tcp transmission
752 * @xprt: transport
753 * @task: rpc task
754 *
755 * This cleans up if an error causes us to abort the transmission of a request.
756 * In this case, the socket may need to be reset in order to avoid confusing
757 * the server.
758 */
759 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
760 {
761 struct rpc_rqst *req;
762
763 if (task != xprt->snd_task)
764 return;
765 if (task == NULL)
766 goto out_release;
767 req = task->tk_rqstp;
768 if (req == NULL)
769 goto out_release;
770 if (req->rq_bytes_sent == 0)
771 goto out_release;
772 if (req->rq_bytes_sent == req->rq_snd_buf.len)
773 goto out_release;
774 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
775 out_release:
776 xprt_release_xprt(xprt, task);
777 }
778
779 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
780 {
781 transport->old_data_ready = sk->sk_data_ready;
782 transport->old_state_change = sk->sk_state_change;
783 transport->old_write_space = sk->sk_write_space;
784 }
785
786 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
787 {
788 sk->sk_data_ready = transport->old_data_ready;
789 sk->sk_state_change = transport->old_state_change;
790 sk->sk_write_space = transport->old_write_space;
791 }
792
793 static void xs_reset_transport(struct sock_xprt *transport)
794 {
795 struct socket *sock = transport->sock;
796 struct sock *sk = transport->inet;
797
798 if (sk == NULL)
799 return;
800
801 transport->srcport = 0;
802
803 write_lock_bh(&sk->sk_callback_lock);
804 transport->inet = NULL;
805 transport->sock = NULL;
806
807 sk->sk_user_data = NULL;
808
809 xs_restore_old_callbacks(transport, sk);
810 write_unlock_bh(&sk->sk_callback_lock);
811
812 sk->sk_no_check = 0;
813
814 sock_release(sock);
815 }
816
817 /**
818 * xs_close - close a socket
819 * @xprt: transport
820 *
821 * This is used when all requests are complete; ie, no DRC state remains
822 * on the server we want to save.
823 *
824 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
825 * xs_reset_transport() zeroing the socket from underneath a writer.
826 */
827 static void xs_close(struct rpc_xprt *xprt)
828 {
829 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
830
831 dprintk("RPC: xs_close xprt %p\n", xprt);
832
833 xs_reset_transport(transport);
834 xprt->reestablish_timeout = 0;
835
836 smp_mb__before_clear_bit();
837 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
838 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
839 clear_bit(XPRT_CLOSING, &xprt->state);
840 smp_mb__after_clear_bit();
841 xprt_disconnect_done(xprt);
842 }
843
844 static void xs_tcp_close(struct rpc_xprt *xprt)
845 {
846 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
847 xs_close(xprt);
848 else
849 xs_tcp_shutdown(xprt);
850 }
851
852 static void xs_local_destroy(struct rpc_xprt *xprt)
853 {
854 xs_close(xprt);
855 xs_free_peer_addresses(xprt);
856 xprt_free(xprt);
857 module_put(THIS_MODULE);
858 }
859
860 /**
861 * xs_destroy - prepare to shutdown a transport
862 * @xprt: doomed transport
863 *
864 */
865 static void xs_destroy(struct rpc_xprt *xprt)
866 {
867 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
868
869 dprintk("RPC: xs_destroy xprt %p\n", xprt);
870
871 cancel_delayed_work_sync(&transport->connect_worker);
872
873 xs_local_destroy(xprt);
874 }
875
876 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
877 {
878 return (struct rpc_xprt *) sk->sk_user_data;
879 }
880
881 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
882 {
883 struct xdr_skb_reader desc = {
884 .skb = skb,
885 .offset = sizeof(rpc_fraghdr),
886 .count = skb->len - sizeof(rpc_fraghdr),
887 };
888
889 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
890 return -1;
891 if (desc.count)
892 return -1;
893 return 0;
894 }
895
896 /**
897 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
898 * @sk: socket with data to read
899 * @len: how much data to read
900 *
901 * Currently this assumes we can read the whole reply in a single gulp.
902 */
903 static void xs_local_data_ready(struct sock *sk, int len)
904 {
905 struct rpc_task *task;
906 struct rpc_xprt *xprt;
907 struct rpc_rqst *rovr;
908 struct sk_buff *skb;
909 int err, repsize, copied;
910 u32 _xid;
911 __be32 *xp;
912
913 read_lock_bh(&sk->sk_callback_lock);
914 dprintk("RPC: %s...\n", __func__);
915 xprt = xprt_from_sock(sk);
916 if (xprt == NULL)
917 goto out;
918
919 skb = skb_recv_datagram(sk, 0, 1, &err);
920 if (skb == NULL)
921 goto out;
922
923 repsize = skb->len - sizeof(rpc_fraghdr);
924 if (repsize < 4) {
925 dprintk("RPC: impossible RPC reply size %d\n", repsize);
926 goto dropit;
927 }
928
929 /* Copy the XID from the skb... */
930 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
931 if (xp == NULL)
932 goto dropit;
933
934 /* Look up and lock the request corresponding to the given XID */
935 spin_lock(&xprt->transport_lock);
936 rovr = xprt_lookup_rqst(xprt, *xp);
937 if (!rovr)
938 goto out_unlock;
939 task = rovr->rq_task;
940
941 copied = rovr->rq_private_buf.buflen;
942 if (copied > repsize)
943 copied = repsize;
944
945 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
946 dprintk("RPC: sk_buff copy failed\n");
947 goto out_unlock;
948 }
949
950 xprt_complete_rqst(task, copied);
951
952 out_unlock:
953 spin_unlock(&xprt->transport_lock);
954 dropit:
955 skb_free_datagram(sk, skb);
956 out:
957 read_unlock_bh(&sk->sk_callback_lock);
958 }
959
960 /**
961 * xs_udp_data_ready - "data ready" callback for UDP sockets
962 * @sk: socket with data to read
963 * @len: how much data to read
964 *
965 */
966 static void xs_udp_data_ready(struct sock *sk, int len)
967 {
968 struct rpc_task *task;
969 struct rpc_xprt *xprt;
970 struct rpc_rqst *rovr;
971 struct sk_buff *skb;
972 int err, repsize, copied;
973 u32 _xid;
974 __be32 *xp;
975
976 read_lock_bh(&sk->sk_callback_lock);
977 dprintk("RPC: xs_udp_data_ready...\n");
978 if (!(xprt = xprt_from_sock(sk)))
979 goto out;
980
981 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
982 goto out;
983
984 repsize = skb->len - sizeof(struct udphdr);
985 if (repsize < 4) {
986 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
987 goto dropit;
988 }
989
990 /* Copy the XID from the skb... */
991 xp = skb_header_pointer(skb, sizeof(struct udphdr),
992 sizeof(_xid), &_xid);
993 if (xp == NULL)
994 goto dropit;
995
996 /* Look up and lock the request corresponding to the given XID */
997 spin_lock(&xprt->transport_lock);
998 rovr = xprt_lookup_rqst(xprt, *xp);
999 if (!rovr)
1000 goto out_unlock;
1001 task = rovr->rq_task;
1002
1003 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1004 copied = repsize;
1005
1006 /* Suck it into the iovec, verify checksum if not done by hw. */
1007 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1008 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1009 goto out_unlock;
1010 }
1011
1012 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1013
1014 xprt_adjust_cwnd(xprt, task, copied);
1015 xprt_complete_rqst(task, copied);
1016
1017 out_unlock:
1018 spin_unlock(&xprt->transport_lock);
1019 dropit:
1020 skb_free_datagram(sk, skb);
1021 out:
1022 read_unlock_bh(&sk->sk_callback_lock);
1023 }
1024
1025 /*
1026 * Helper function to force a TCP close if the server is sending
1027 * junk and/or it has put us in CLOSE_WAIT
1028 */
1029 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1030 {
1031 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1032 xprt_force_disconnect(xprt);
1033 }
1034
1035 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1036 {
1037 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1038 size_t len, used;
1039 char *p;
1040
1041 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1042 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1043 used = xdr_skb_read_bits(desc, p, len);
1044 transport->tcp_offset += used;
1045 if (used != len)
1046 return;
1047
1048 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1049 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1050 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1051 else
1052 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1053 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1054
1055 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1056 transport->tcp_offset = 0;
1057
1058 /* Sanity check of the record length */
1059 if (unlikely(transport->tcp_reclen < 8)) {
1060 dprintk("RPC: invalid TCP record fragment length\n");
1061 xs_tcp_force_close(xprt);
1062 return;
1063 }
1064 dprintk("RPC: reading TCP record fragment of length %d\n",
1065 transport->tcp_reclen);
1066 }
1067
1068 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1069 {
1070 if (transport->tcp_offset == transport->tcp_reclen) {
1071 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1072 transport->tcp_offset = 0;
1073 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1074 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1075 transport->tcp_flags |= TCP_RCV_COPY_XID;
1076 transport->tcp_copied = 0;
1077 }
1078 }
1079 }
1080
1081 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1082 {
1083 size_t len, used;
1084 char *p;
1085
1086 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1087 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1088 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1089 used = xdr_skb_read_bits(desc, p, len);
1090 transport->tcp_offset += used;
1091 if (used != len)
1092 return;
1093 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1094 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1095 transport->tcp_copied = 4;
1096 dprintk("RPC: reading %s XID %08x\n",
1097 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1098 : "request with",
1099 ntohl(transport->tcp_xid));
1100 xs_tcp_check_fraghdr(transport);
1101 }
1102
1103 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1104 struct xdr_skb_reader *desc)
1105 {
1106 size_t len, used;
1107 u32 offset;
1108 char *p;
1109
1110 /*
1111 * We want transport->tcp_offset to be 8 at the end of this routine
1112 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1113 * When this function is called for the first time,
1114 * transport->tcp_offset is 4 (after having already read the xid).
1115 */
1116 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1117 len = sizeof(transport->tcp_calldir) - offset;
1118 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1119 p = ((char *) &transport->tcp_calldir) + offset;
1120 used = xdr_skb_read_bits(desc, p, len);
1121 transport->tcp_offset += used;
1122 if (used != len)
1123 return;
1124 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1125 /*
1126 * We don't yet have the XDR buffer, so we will write the calldir
1127 * out after we get the buffer from the 'struct rpc_rqst'
1128 */
1129 switch (ntohl(transport->tcp_calldir)) {
1130 case RPC_REPLY:
1131 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1132 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1133 transport->tcp_flags |= TCP_RPC_REPLY;
1134 break;
1135 case RPC_CALL:
1136 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1137 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1138 transport->tcp_flags &= ~TCP_RPC_REPLY;
1139 break;
1140 default:
1141 dprintk("RPC: invalid request message type\n");
1142 xs_tcp_force_close(&transport->xprt);
1143 }
1144 xs_tcp_check_fraghdr(transport);
1145 }
1146
1147 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1148 struct xdr_skb_reader *desc,
1149 struct rpc_rqst *req)
1150 {
1151 struct sock_xprt *transport =
1152 container_of(xprt, struct sock_xprt, xprt);
1153 struct xdr_buf *rcvbuf;
1154 size_t len;
1155 ssize_t r;
1156
1157 rcvbuf = &req->rq_private_buf;
1158
1159 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1160 /*
1161 * Save the RPC direction in the XDR buffer
1162 */
1163 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1164 &transport->tcp_calldir,
1165 sizeof(transport->tcp_calldir));
1166 transport->tcp_copied += sizeof(transport->tcp_calldir);
1167 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1168 }
1169
1170 len = desc->count;
1171 if (len > transport->tcp_reclen - transport->tcp_offset) {
1172 struct xdr_skb_reader my_desc;
1173
1174 len = transport->tcp_reclen - transport->tcp_offset;
1175 memcpy(&my_desc, desc, sizeof(my_desc));
1176 my_desc.count = len;
1177 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1178 &my_desc, xdr_skb_read_bits);
1179 desc->count -= r;
1180 desc->offset += r;
1181 } else
1182 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1183 desc, xdr_skb_read_bits);
1184
1185 if (r > 0) {
1186 transport->tcp_copied += r;
1187 transport->tcp_offset += r;
1188 }
1189 if (r != len) {
1190 /* Error when copying to the receive buffer,
1191 * usually because we weren't able to allocate
1192 * additional buffer pages. All we can do now
1193 * is turn off TCP_RCV_COPY_DATA, so the request
1194 * will not receive any additional updates,
1195 * and time out.
1196 * Any remaining data from this record will
1197 * be discarded.
1198 */
1199 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1200 dprintk("RPC: XID %08x truncated request\n",
1201 ntohl(transport->tcp_xid));
1202 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1203 "tcp_offset = %u, tcp_reclen = %u\n",
1204 xprt, transport->tcp_copied,
1205 transport->tcp_offset, transport->tcp_reclen);
1206 return;
1207 }
1208
1209 dprintk("RPC: XID %08x read %Zd bytes\n",
1210 ntohl(transport->tcp_xid), r);
1211 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1212 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1213 transport->tcp_offset, transport->tcp_reclen);
1214
1215 if (transport->tcp_copied == req->rq_private_buf.buflen)
1216 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1217 else if (transport->tcp_offset == transport->tcp_reclen) {
1218 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1219 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1220 }
1221 }
1222
1223 /*
1224 * Finds the request corresponding to the RPC xid and invokes the common
1225 * tcp read code to read the data.
1226 */
1227 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1228 struct xdr_skb_reader *desc)
1229 {
1230 struct sock_xprt *transport =
1231 container_of(xprt, struct sock_xprt, xprt);
1232 struct rpc_rqst *req;
1233
1234 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1235
1236 /* Find and lock the request corresponding to this xid */
1237 spin_lock(&xprt->transport_lock);
1238 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1239 if (!req) {
1240 dprintk("RPC: XID %08x request not found!\n",
1241 ntohl(transport->tcp_xid));
1242 spin_unlock(&xprt->transport_lock);
1243 return -1;
1244 }
1245
1246 xs_tcp_read_common(xprt, desc, req);
1247
1248 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1249 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1250
1251 spin_unlock(&xprt->transport_lock);
1252 return 0;
1253 }
1254
1255 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1256 /*
1257 * Obtains an rpc_rqst previously allocated and invokes the common
1258 * tcp read code to read the data. The result is placed in the callback
1259 * queue.
1260 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1261 * connection and return -1.
1262 */
1263 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1264 struct xdr_skb_reader *desc)
1265 {
1266 struct sock_xprt *transport =
1267 container_of(xprt, struct sock_xprt, xprt);
1268 struct rpc_rqst *req;
1269
1270 req = xprt_alloc_bc_request(xprt);
1271 if (req == NULL) {
1272 printk(KERN_WARNING "Callback slot table overflowed\n");
1273 xprt_force_disconnect(xprt);
1274 return -1;
1275 }
1276
1277 req->rq_xid = transport->tcp_xid;
1278 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1279 xs_tcp_read_common(xprt, desc, req);
1280
1281 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1282 struct svc_serv *bc_serv = xprt->bc_serv;
1283
1284 /*
1285 * Add callback request to callback list. The callback
1286 * service sleeps on the sv_cb_waitq waiting for new
1287 * requests. Wake it up after adding enqueing the
1288 * request.
1289 */
1290 dprintk("RPC: add callback request to list\n");
1291 spin_lock(&bc_serv->sv_cb_lock);
1292 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1293 spin_unlock(&bc_serv->sv_cb_lock);
1294 wake_up(&bc_serv->sv_cb_waitq);
1295 }
1296
1297 req->rq_private_buf.len = transport->tcp_copied;
1298
1299 return 0;
1300 }
1301
1302 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1303 struct xdr_skb_reader *desc)
1304 {
1305 struct sock_xprt *transport =
1306 container_of(xprt, struct sock_xprt, xprt);
1307
1308 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1309 xs_tcp_read_reply(xprt, desc) :
1310 xs_tcp_read_callback(xprt, desc);
1311 }
1312 #else
1313 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1314 struct xdr_skb_reader *desc)
1315 {
1316 return xs_tcp_read_reply(xprt, desc);
1317 }
1318 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1319
1320 /*
1321 * Read data off the transport. This can be either an RPC_CALL or an
1322 * RPC_REPLY. Relay the processing to helper functions.
1323 */
1324 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1325 struct xdr_skb_reader *desc)
1326 {
1327 struct sock_xprt *transport =
1328 container_of(xprt, struct sock_xprt, xprt);
1329
1330 if (_xs_tcp_read_data(xprt, desc) == 0)
1331 xs_tcp_check_fraghdr(transport);
1332 else {
1333 /*
1334 * The transport_lock protects the request handling.
1335 * There's no need to hold it to update the tcp_flags.
1336 */
1337 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1338 }
1339 }
1340
1341 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1342 {
1343 size_t len;
1344
1345 len = transport->tcp_reclen - transport->tcp_offset;
1346 if (len > desc->count)
1347 len = desc->count;
1348 desc->count -= len;
1349 desc->offset += len;
1350 transport->tcp_offset += len;
1351 dprintk("RPC: discarded %Zu bytes\n", len);
1352 xs_tcp_check_fraghdr(transport);
1353 }
1354
1355 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1356 {
1357 struct rpc_xprt *xprt = rd_desc->arg.data;
1358 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1359 struct xdr_skb_reader desc = {
1360 .skb = skb,
1361 .offset = offset,
1362 .count = len,
1363 };
1364
1365 dprintk("RPC: xs_tcp_data_recv started\n");
1366 do {
1367 /* Read in a new fragment marker if necessary */
1368 /* Can we ever really expect to get completely empty fragments? */
1369 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1370 xs_tcp_read_fraghdr(xprt, &desc);
1371 continue;
1372 }
1373 /* Read in the xid if necessary */
1374 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1375 xs_tcp_read_xid(transport, &desc);
1376 continue;
1377 }
1378 /* Read in the call/reply flag */
1379 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1380 xs_tcp_read_calldir(transport, &desc);
1381 continue;
1382 }
1383 /* Read in the request data */
1384 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1385 xs_tcp_read_data(xprt, &desc);
1386 continue;
1387 }
1388 /* Skip over any trailing bytes on short reads */
1389 xs_tcp_read_discard(transport, &desc);
1390 } while (desc.count);
1391 dprintk("RPC: xs_tcp_data_recv done\n");
1392 return len - desc.count;
1393 }
1394
1395 /**
1396 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1397 * @sk: socket with data to read
1398 * @bytes: how much data to read
1399 *
1400 */
1401 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1402 {
1403 struct rpc_xprt *xprt;
1404 read_descriptor_t rd_desc;
1405 int read;
1406
1407 dprintk("RPC: xs_tcp_data_ready...\n");
1408
1409 read_lock_bh(&sk->sk_callback_lock);
1410 if (!(xprt = xprt_from_sock(sk)))
1411 goto out;
1412 /* Any data means we had a useful conversation, so
1413 * the we don't need to delay the next reconnect
1414 */
1415 if (xprt->reestablish_timeout)
1416 xprt->reestablish_timeout = 0;
1417
1418 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1419 rd_desc.arg.data = xprt;
1420 do {
1421 rd_desc.count = 65536;
1422 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1423 } while (read > 0);
1424 out:
1425 read_unlock_bh(&sk->sk_callback_lock);
1426 }
1427
1428 /*
1429 * Do the equivalent of linger/linger2 handling for dealing with
1430 * broken servers that don't close the socket in a timely
1431 * fashion
1432 */
1433 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1434 unsigned long timeout)
1435 {
1436 struct sock_xprt *transport;
1437
1438 if (xprt_test_and_set_connecting(xprt))
1439 return;
1440 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1441 transport = container_of(xprt, struct sock_xprt, xprt);
1442 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1443 timeout);
1444 }
1445
1446 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1447 {
1448 struct sock_xprt *transport;
1449
1450 transport = container_of(xprt, struct sock_xprt, xprt);
1451
1452 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1453 !cancel_delayed_work(&transport->connect_worker))
1454 return;
1455 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1456 xprt_clear_connecting(xprt);
1457 }
1458
1459 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1460 {
1461 smp_mb__before_clear_bit();
1462 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1463 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1464 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1465 clear_bit(XPRT_CLOSING, &xprt->state);
1466 smp_mb__after_clear_bit();
1467 }
1468
1469 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1470 {
1471 xs_sock_reset_connection_flags(xprt);
1472 /* Mark transport as closed and wake up all pending tasks */
1473 xprt_disconnect_done(xprt);
1474 }
1475
1476 /**
1477 * xs_tcp_state_change - callback to handle TCP socket state changes
1478 * @sk: socket whose state has changed
1479 *
1480 */
1481 static void xs_tcp_state_change(struct sock *sk)
1482 {
1483 struct rpc_xprt *xprt;
1484
1485 read_lock_bh(&sk->sk_callback_lock);
1486 if (!(xprt = xprt_from_sock(sk)))
1487 goto out;
1488 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1489 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1490 sk->sk_state, xprt_connected(xprt),
1491 sock_flag(sk, SOCK_DEAD),
1492 sock_flag(sk, SOCK_ZAPPED),
1493 sk->sk_shutdown);
1494
1495 switch (sk->sk_state) {
1496 case TCP_ESTABLISHED:
1497 spin_lock(&xprt->transport_lock);
1498 if (!xprt_test_and_set_connected(xprt)) {
1499 struct sock_xprt *transport = container_of(xprt,
1500 struct sock_xprt, xprt);
1501
1502 /* Reset TCP record info */
1503 transport->tcp_offset = 0;
1504 transport->tcp_reclen = 0;
1505 transport->tcp_copied = 0;
1506 transport->tcp_flags =
1507 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1508
1509 xprt_wake_pending_tasks(xprt, -EAGAIN);
1510 }
1511 spin_unlock(&xprt->transport_lock);
1512 break;
1513 case TCP_FIN_WAIT1:
1514 /* The client initiated a shutdown of the socket */
1515 xprt->connect_cookie++;
1516 xprt->reestablish_timeout = 0;
1517 set_bit(XPRT_CLOSING, &xprt->state);
1518 smp_mb__before_clear_bit();
1519 clear_bit(XPRT_CONNECTED, &xprt->state);
1520 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1521 smp_mb__after_clear_bit();
1522 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1523 break;
1524 case TCP_CLOSE_WAIT:
1525 /* The server initiated a shutdown of the socket */
1526 xprt->connect_cookie++;
1527 clear_bit(XPRT_CONNECTED, &xprt->state);
1528 xs_tcp_force_close(xprt);
1529 case TCP_CLOSING:
1530 /*
1531 * If the server closed down the connection, make sure that
1532 * we back off before reconnecting
1533 */
1534 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1535 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1536 break;
1537 case TCP_LAST_ACK:
1538 set_bit(XPRT_CLOSING, &xprt->state);
1539 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1540 smp_mb__before_clear_bit();
1541 clear_bit(XPRT_CONNECTED, &xprt->state);
1542 smp_mb__after_clear_bit();
1543 break;
1544 case TCP_CLOSE:
1545 xs_tcp_cancel_linger_timeout(xprt);
1546 xs_sock_mark_closed(xprt);
1547 }
1548 out:
1549 read_unlock_bh(&sk->sk_callback_lock);
1550 }
1551
1552 static void xs_write_space(struct sock *sk)
1553 {
1554 struct socket *sock;
1555 struct rpc_xprt *xprt;
1556
1557 if (unlikely(!(sock = sk->sk_socket)))
1558 return;
1559 clear_bit(SOCK_NOSPACE, &sock->flags);
1560
1561 if (unlikely(!(xprt = xprt_from_sock(sk))))
1562 return;
1563 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1564 return;
1565
1566 xprt_write_space(xprt);
1567 }
1568
1569 /**
1570 * xs_udp_write_space - callback invoked when socket buffer space
1571 * becomes available
1572 * @sk: socket whose state has changed
1573 *
1574 * Called when more output buffer space is available for this socket.
1575 * We try not to wake our writers until they can make "significant"
1576 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1577 * with a bunch of small requests.
1578 */
1579 static void xs_udp_write_space(struct sock *sk)
1580 {
1581 read_lock_bh(&sk->sk_callback_lock);
1582
1583 /* from net/core/sock.c:sock_def_write_space */
1584 if (sock_writeable(sk))
1585 xs_write_space(sk);
1586
1587 read_unlock_bh(&sk->sk_callback_lock);
1588 }
1589
1590 /**
1591 * xs_tcp_write_space - callback invoked when socket buffer space
1592 * becomes available
1593 * @sk: socket whose state has changed
1594 *
1595 * Called when more output buffer space is available for this socket.
1596 * We try not to wake our writers until they can make "significant"
1597 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1598 * with a bunch of small requests.
1599 */
1600 static void xs_tcp_write_space(struct sock *sk)
1601 {
1602 read_lock_bh(&sk->sk_callback_lock);
1603
1604 /* from net/core/stream.c:sk_stream_write_space */
1605 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1606 xs_write_space(sk);
1607
1608 read_unlock_bh(&sk->sk_callback_lock);
1609 }
1610
1611 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1612 {
1613 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1614 struct sock *sk = transport->inet;
1615
1616 if (transport->rcvsize) {
1617 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1618 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1619 }
1620 if (transport->sndsize) {
1621 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1622 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1623 sk->sk_write_space(sk);
1624 }
1625 }
1626
1627 /**
1628 * xs_udp_set_buffer_size - set send and receive limits
1629 * @xprt: generic transport
1630 * @sndsize: requested size of send buffer, in bytes
1631 * @rcvsize: requested size of receive buffer, in bytes
1632 *
1633 * Set socket send and receive buffer size limits.
1634 */
1635 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1636 {
1637 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1638
1639 transport->sndsize = 0;
1640 if (sndsize)
1641 transport->sndsize = sndsize + 1024;
1642 transport->rcvsize = 0;
1643 if (rcvsize)
1644 transport->rcvsize = rcvsize + 1024;
1645
1646 xs_udp_do_set_buffer_size(xprt);
1647 }
1648
1649 /**
1650 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1651 * @task: task that timed out
1652 *
1653 * Adjust the congestion window after a retransmit timeout has occurred.
1654 */
1655 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1656 {
1657 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1658 }
1659
1660 static unsigned short xs_get_random_port(void)
1661 {
1662 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1663 unsigned short rand = (unsigned short) net_random() % range;
1664 return rand + xprt_min_resvport;
1665 }
1666
1667 /**
1668 * xs_set_port - reset the port number in the remote endpoint address
1669 * @xprt: generic transport
1670 * @port: new port number
1671 *
1672 */
1673 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1674 {
1675 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1676
1677 rpc_set_port(xs_addr(xprt), port);
1678 xs_update_peer_port(xprt);
1679 }
1680
1681 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1682 {
1683 unsigned short port = transport->srcport;
1684
1685 if (port == 0 && transport->xprt.resvport)
1686 port = xs_get_random_port();
1687 return port;
1688 }
1689
1690 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1691 {
1692 if (transport->srcport != 0)
1693 transport->srcport = 0;
1694 if (!transport->xprt.resvport)
1695 return 0;
1696 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1697 return xprt_max_resvport;
1698 return --port;
1699 }
1700 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1701 {
1702 struct sockaddr_storage myaddr;
1703 int err, nloop = 0;
1704 unsigned short port = xs_get_srcport(transport);
1705 unsigned short last;
1706
1707 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1708 do {
1709 rpc_set_port((struct sockaddr *)&myaddr, port);
1710 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1711 transport->xprt.addrlen);
1712 if (port == 0)
1713 break;
1714 if (err == 0) {
1715 transport->srcport = port;
1716 break;
1717 }
1718 last = port;
1719 port = xs_next_srcport(transport, port);
1720 if (port > last)
1721 nloop++;
1722 } while (err == -EADDRINUSE && nloop != 2);
1723
1724 if (myaddr.ss_family == AF_INET)
1725 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1726 &((struct sockaddr_in *)&myaddr)->sin_addr,
1727 port, err ? "failed" : "ok", err);
1728 else
1729 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1730 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1731 port, err ? "failed" : "ok", err);
1732 return err;
1733 }
1734
1735 /*
1736 * We don't support autobind on AF_LOCAL sockets
1737 */
1738 static void xs_local_rpcbind(struct rpc_task *task)
1739 {
1740 rcu_read_lock();
1741 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1742 rcu_read_unlock();
1743 }
1744
1745 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1746 {
1747 }
1748
1749 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1750 static struct lock_class_key xs_key[2];
1751 static struct lock_class_key xs_slock_key[2];
1752
1753 static inline void xs_reclassify_socketu(struct socket *sock)
1754 {
1755 struct sock *sk = sock->sk;
1756
1757 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1758 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1759 }
1760
1761 static inline void xs_reclassify_socket4(struct socket *sock)
1762 {
1763 struct sock *sk = sock->sk;
1764
1765 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1766 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1767 }
1768
1769 static inline void xs_reclassify_socket6(struct socket *sock)
1770 {
1771 struct sock *sk = sock->sk;
1772
1773 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1774 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1775 }
1776
1777 static inline void xs_reclassify_socket(int family, struct socket *sock)
1778 {
1779 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1780 if (sock_owned_by_user(sock->sk))
1781 return;
1782
1783 switch (family) {
1784 case AF_LOCAL:
1785 xs_reclassify_socketu(sock);
1786 break;
1787 case AF_INET:
1788 xs_reclassify_socket4(sock);
1789 break;
1790 case AF_INET6:
1791 xs_reclassify_socket6(sock);
1792 break;
1793 }
1794 }
1795 #else
1796 static inline void xs_reclassify_socketu(struct socket *sock)
1797 {
1798 }
1799
1800 static inline void xs_reclassify_socket4(struct socket *sock)
1801 {
1802 }
1803
1804 static inline void xs_reclassify_socket6(struct socket *sock)
1805 {
1806 }
1807
1808 static inline void xs_reclassify_socket(int family, struct socket *sock)
1809 {
1810 }
1811 #endif
1812
1813 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1814 struct sock_xprt *transport, int family, int type, int protocol)
1815 {
1816 struct socket *sock;
1817 int err;
1818
1819 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1820 if (err < 0) {
1821 dprintk("RPC: can't create %d transport socket (%d).\n",
1822 protocol, -err);
1823 goto out;
1824 }
1825 xs_reclassify_socket(family, sock);
1826
1827 err = xs_bind(transport, sock);
1828 if (err) {
1829 sock_release(sock);
1830 goto out;
1831 }
1832
1833 return sock;
1834 out:
1835 return ERR_PTR(err);
1836 }
1837
1838 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1839 struct socket *sock)
1840 {
1841 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1842 xprt);
1843
1844 if (!transport->inet) {
1845 struct sock *sk = sock->sk;
1846
1847 write_lock_bh(&sk->sk_callback_lock);
1848
1849 xs_save_old_callbacks(transport, sk);
1850
1851 sk->sk_user_data = xprt;
1852 sk->sk_data_ready = xs_local_data_ready;
1853 sk->sk_write_space = xs_udp_write_space;
1854 sk->sk_allocation = GFP_ATOMIC;
1855
1856 xprt_clear_connected(xprt);
1857
1858 /* Reset to new socket */
1859 transport->sock = sock;
1860 transport->inet = sk;
1861
1862 write_unlock_bh(&sk->sk_callback_lock);
1863 }
1864
1865 /* Tell the socket layer to start connecting... */
1866 xprt->stat.connect_count++;
1867 xprt->stat.connect_start = jiffies;
1868 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1869 }
1870
1871 /**
1872 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1873 * @xprt: RPC transport to connect
1874 * @transport: socket transport to connect
1875 * @create_sock: function to create a socket of the correct type
1876 */
1877 static int xs_local_setup_socket(struct sock_xprt *transport)
1878 {
1879 struct rpc_xprt *xprt = &transport->xprt;
1880 struct socket *sock;
1881 int status = -EIO;
1882
1883 current->flags |= PF_FSTRANS;
1884
1885 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1886 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1887 SOCK_STREAM, 0, &sock, 1);
1888 if (status < 0) {
1889 dprintk("RPC: can't create AF_LOCAL "
1890 "transport socket (%d).\n", -status);
1891 goto out;
1892 }
1893 xs_reclassify_socketu(sock);
1894
1895 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1896 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1897
1898 status = xs_local_finish_connecting(xprt, sock);
1899 switch (status) {
1900 case 0:
1901 dprintk("RPC: xprt %p connected to %s\n",
1902 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1903 xprt_set_connected(xprt);
1904 break;
1905 case -ENOENT:
1906 dprintk("RPC: xprt %p: socket %s does not exist\n",
1907 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1908 break;
1909 case -ECONNREFUSED:
1910 dprintk("RPC: xprt %p: connection refused for %s\n",
1911 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1912 break;
1913 default:
1914 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1915 __func__, -status,
1916 xprt->address_strings[RPC_DISPLAY_ADDR]);
1917 }
1918
1919 out:
1920 xprt_clear_connecting(xprt);
1921 xprt_wake_pending_tasks(xprt, status);
1922 current->flags &= ~PF_FSTRANS;
1923 return status;
1924 }
1925
1926 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1927 {
1928 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1929 int ret;
1930
1931 if (RPC_IS_ASYNC(task)) {
1932 /*
1933 * We want the AF_LOCAL connect to be resolved in the
1934 * filesystem namespace of the process making the rpc
1935 * call. Thus we connect synchronously.
1936 *
1937 * If we want to support asynchronous AF_LOCAL calls,
1938 * we'll need to figure out how to pass a namespace to
1939 * connect.
1940 */
1941 rpc_exit(task, -ENOTCONN);
1942 return;
1943 }
1944 ret = xs_local_setup_socket(transport);
1945 if (ret && !RPC_IS_SOFTCONN(task))
1946 msleep_interruptible(15000);
1947 }
1948
1949 #ifdef CONFIG_SUNRPC_SWAP
1950 static void xs_set_memalloc(struct rpc_xprt *xprt)
1951 {
1952 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1953 xprt);
1954
1955 if (xprt->swapper)
1956 sk_set_memalloc(transport->inet);
1957 }
1958
1959 /**
1960 * xs_swapper - Tag this transport as being used for swap.
1961 * @xprt: transport to tag
1962 * @enable: enable/disable
1963 *
1964 */
1965 int xs_swapper(struct rpc_xprt *xprt, int enable)
1966 {
1967 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1968 xprt);
1969 int err = 0;
1970
1971 if (enable) {
1972 xprt->swapper++;
1973 xs_set_memalloc(xprt);
1974 } else if (xprt->swapper) {
1975 xprt->swapper--;
1976 sk_clear_memalloc(transport->inet);
1977 }
1978
1979 return err;
1980 }
1981 EXPORT_SYMBOL_GPL(xs_swapper);
1982 #else
1983 static void xs_set_memalloc(struct rpc_xprt *xprt)
1984 {
1985 }
1986 #endif
1987
1988 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1989 {
1990 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1991
1992 if (!transport->inet) {
1993 struct sock *sk = sock->sk;
1994
1995 write_lock_bh(&sk->sk_callback_lock);
1996
1997 xs_save_old_callbacks(transport, sk);
1998
1999 sk->sk_user_data = xprt;
2000 sk->sk_data_ready = xs_udp_data_ready;
2001 sk->sk_write_space = xs_udp_write_space;
2002 sk->sk_no_check = UDP_CSUM_NORCV;
2003 sk->sk_allocation = GFP_ATOMIC;
2004
2005 xprt_set_connected(xprt);
2006
2007 /* Reset to new socket */
2008 transport->sock = sock;
2009 transport->inet = sk;
2010
2011 xs_set_memalloc(xprt);
2012
2013 write_unlock_bh(&sk->sk_callback_lock);
2014 }
2015 xs_udp_do_set_buffer_size(xprt);
2016 }
2017
2018 static void xs_udp_setup_socket(struct work_struct *work)
2019 {
2020 struct sock_xprt *transport =
2021 container_of(work, struct sock_xprt, connect_worker.work);
2022 struct rpc_xprt *xprt = &transport->xprt;
2023 struct socket *sock = transport->sock;
2024 int status = -EIO;
2025
2026 current->flags |= PF_FSTRANS;
2027
2028 /* Start by resetting any existing state */
2029 xs_reset_transport(transport);
2030 sock = xs_create_sock(xprt, transport,
2031 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2032 if (IS_ERR(sock))
2033 goto out;
2034
2035 dprintk("RPC: worker connecting xprt %p via %s to "
2036 "%s (port %s)\n", xprt,
2037 xprt->address_strings[RPC_DISPLAY_PROTO],
2038 xprt->address_strings[RPC_DISPLAY_ADDR],
2039 xprt->address_strings[RPC_DISPLAY_PORT]);
2040
2041 xs_udp_finish_connecting(xprt, sock);
2042 status = 0;
2043 out:
2044 xprt_clear_connecting(xprt);
2045 xprt_wake_pending_tasks(xprt, status);
2046 current->flags &= ~PF_FSTRANS;
2047 }
2048
2049 /*
2050 * We need to preserve the port number so the reply cache on the server can
2051 * find our cached RPC replies when we get around to reconnecting.
2052 */
2053 static void xs_abort_connection(struct sock_xprt *transport)
2054 {
2055 int result;
2056 struct sockaddr any;
2057
2058 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2059
2060 /*
2061 * Disconnect the transport socket by doing a connect operation
2062 * with AF_UNSPEC. This should return immediately...
2063 */
2064 memset(&any, 0, sizeof(any));
2065 any.sa_family = AF_UNSPEC;
2066 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2067 if (!result)
2068 xs_sock_reset_connection_flags(&transport->xprt);
2069 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
2070 }
2071
2072 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2073 {
2074 unsigned int state = transport->inet->sk_state;
2075
2076 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2077 /* we don't need to abort the connection if the socket
2078 * hasn't undergone a shutdown
2079 */
2080 if (transport->inet->sk_shutdown == 0)
2081 return;
2082 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2083 __func__, transport->inet->sk_shutdown);
2084 }
2085 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2086 /* we don't need to abort the connection if the socket
2087 * hasn't undergone a shutdown
2088 */
2089 if (transport->inet->sk_shutdown == 0)
2090 return;
2091 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2092 "sk_shutdown set to %d\n",
2093 __func__, transport->inet->sk_shutdown);
2094 }
2095 xs_abort_connection(transport);
2096 }
2097
2098 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2099 {
2100 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2101 int ret = -ENOTCONN;
2102
2103 if (!transport->inet) {
2104 struct sock *sk = sock->sk;
2105
2106 write_lock_bh(&sk->sk_callback_lock);
2107
2108 xs_save_old_callbacks(transport, sk);
2109
2110 sk->sk_user_data = xprt;
2111 sk->sk_data_ready = xs_tcp_data_ready;
2112 sk->sk_state_change = xs_tcp_state_change;
2113 sk->sk_write_space = xs_tcp_write_space;
2114 sk->sk_allocation = GFP_ATOMIC;
2115
2116 /* socket options */
2117 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2118 sock_reset_flag(sk, SOCK_LINGER);
2119 tcp_sk(sk)->linger2 = 0;
2120 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2121
2122 xprt_clear_connected(xprt);
2123
2124 /* Reset to new socket */
2125 transport->sock = sock;
2126 transport->inet = sk;
2127
2128 write_unlock_bh(&sk->sk_callback_lock);
2129 }
2130
2131 if (!xprt_bound(xprt))
2132 goto out;
2133
2134 xs_set_memalloc(xprt);
2135
2136 /* Tell the socket layer to start connecting... */
2137 xprt->stat.connect_count++;
2138 xprt->stat.connect_start = jiffies;
2139 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2140 switch (ret) {
2141 case 0:
2142 case -EINPROGRESS:
2143 /* SYN_SENT! */
2144 xprt->connect_cookie++;
2145 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2146 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2147 }
2148 out:
2149 return ret;
2150 }
2151
2152 /**
2153 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2154 * @xprt: RPC transport to connect
2155 * @transport: socket transport to connect
2156 * @create_sock: function to create a socket of the correct type
2157 *
2158 * Invoked by a work queue tasklet.
2159 */
2160 static void xs_tcp_setup_socket(struct work_struct *work)
2161 {
2162 struct sock_xprt *transport =
2163 container_of(work, struct sock_xprt, connect_worker.work);
2164 struct socket *sock = transport->sock;
2165 struct rpc_xprt *xprt = &transport->xprt;
2166 int status = -EIO;
2167
2168 current->flags |= PF_FSTRANS;
2169
2170 if (!sock) {
2171 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2172 sock = xs_create_sock(xprt, transport,
2173 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2174 if (IS_ERR(sock)) {
2175 status = PTR_ERR(sock);
2176 goto out;
2177 }
2178 } else {
2179 int abort_and_exit;
2180
2181 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2182 &xprt->state);
2183 /* "close" the socket, preserving the local port */
2184 xs_tcp_reuse_connection(transport);
2185
2186 if (abort_and_exit)
2187 goto out_eagain;
2188 }
2189
2190 dprintk("RPC: worker connecting xprt %p via %s to "
2191 "%s (port %s)\n", xprt,
2192 xprt->address_strings[RPC_DISPLAY_PROTO],
2193 xprt->address_strings[RPC_DISPLAY_ADDR],
2194 xprt->address_strings[RPC_DISPLAY_PORT]);
2195
2196 status = xs_tcp_finish_connecting(xprt, sock);
2197 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2198 xprt, -status, xprt_connected(xprt),
2199 sock->sk->sk_state);
2200 switch (status) {
2201 default:
2202 printk("%s: connect returned unhandled error %d\n",
2203 __func__, status);
2204 case -EADDRNOTAVAIL:
2205 /* We're probably in TIME_WAIT. Get rid of existing socket,
2206 * and retry
2207 */
2208 xs_tcp_force_close(xprt);
2209 break;
2210 case 0:
2211 case -EINPROGRESS:
2212 case -EALREADY:
2213 xprt_clear_connecting(xprt);
2214 current->flags &= ~PF_FSTRANS;
2215 return;
2216 case -EINVAL:
2217 /* Happens, for instance, if the user specified a link
2218 * local IPv6 address without a scope-id.
2219 */
2220 case -ECONNREFUSED:
2221 case -ECONNRESET:
2222 case -ENETUNREACH:
2223 /* retry with existing socket, after a delay */
2224 goto out;
2225 }
2226 out_eagain:
2227 status = -EAGAIN;
2228 out:
2229 xprt_clear_connecting(xprt);
2230 xprt_wake_pending_tasks(xprt, status);
2231 current->flags &= ~PF_FSTRANS;
2232 }
2233
2234 /**
2235 * xs_connect - connect a socket to a remote endpoint
2236 * @xprt: pointer to transport structure
2237 * @task: address of RPC task that manages state of connect request
2238 *
2239 * TCP: If the remote end dropped the connection, delay reconnecting.
2240 *
2241 * UDP socket connects are synchronous, but we use a work queue anyway
2242 * to guarantee that even unprivileged user processes can set up a
2243 * socket on a privileged port.
2244 *
2245 * If a UDP socket connect fails, the delay behavior here prevents
2246 * retry floods (hard mounts).
2247 */
2248 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2249 {
2250 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2251
2252 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2253 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2254 "seconds\n",
2255 xprt, xprt->reestablish_timeout / HZ);
2256 queue_delayed_work(rpciod_workqueue,
2257 &transport->connect_worker,
2258 xprt->reestablish_timeout);
2259 xprt->reestablish_timeout <<= 1;
2260 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2261 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2262 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2263 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2264 } else {
2265 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2266 queue_delayed_work(rpciod_workqueue,
2267 &transport->connect_worker, 0);
2268 }
2269 }
2270
2271 /**
2272 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2273 * @xprt: rpc_xprt struct containing statistics
2274 * @seq: output file
2275 *
2276 */
2277 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2278 {
2279 long idle_time = 0;
2280
2281 if (xprt_connected(xprt))
2282 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2283
2284 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2285 "%llu %llu %lu %llu %llu\n",
2286 xprt->stat.bind_count,
2287 xprt->stat.connect_count,
2288 xprt->stat.connect_time,
2289 idle_time,
2290 xprt->stat.sends,
2291 xprt->stat.recvs,
2292 xprt->stat.bad_xids,
2293 xprt->stat.req_u,
2294 xprt->stat.bklog_u,
2295 xprt->stat.max_slots,
2296 xprt->stat.sending_u,
2297 xprt->stat.pending_u);
2298 }
2299
2300 /**
2301 * xs_udp_print_stats - display UDP socket-specifc stats
2302 * @xprt: rpc_xprt struct containing statistics
2303 * @seq: output file
2304 *
2305 */
2306 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2307 {
2308 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2309
2310 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2311 "%lu %llu %llu\n",
2312 transport->srcport,
2313 xprt->stat.bind_count,
2314 xprt->stat.sends,
2315 xprt->stat.recvs,
2316 xprt->stat.bad_xids,
2317 xprt->stat.req_u,
2318 xprt->stat.bklog_u,
2319 xprt->stat.max_slots,
2320 xprt->stat.sending_u,
2321 xprt->stat.pending_u);
2322 }
2323
2324 /**
2325 * xs_tcp_print_stats - display TCP socket-specifc stats
2326 * @xprt: rpc_xprt struct containing statistics
2327 * @seq: output file
2328 *
2329 */
2330 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2331 {
2332 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2333 long idle_time = 0;
2334
2335 if (xprt_connected(xprt))
2336 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2337
2338 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2339 "%llu %llu %lu %llu %llu\n",
2340 transport->srcport,
2341 xprt->stat.bind_count,
2342 xprt->stat.connect_count,
2343 xprt->stat.connect_time,
2344 idle_time,
2345 xprt->stat.sends,
2346 xprt->stat.recvs,
2347 xprt->stat.bad_xids,
2348 xprt->stat.req_u,
2349 xprt->stat.bklog_u,
2350 xprt->stat.max_slots,
2351 xprt->stat.sending_u,
2352 xprt->stat.pending_u);
2353 }
2354
2355 /*
2356 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2357 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2358 * to use the server side send routines.
2359 */
2360 static void *bc_malloc(struct rpc_task *task, size_t size)
2361 {
2362 struct page *page;
2363 struct rpc_buffer *buf;
2364
2365 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2366 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2367 return NULL;
2368
2369 page = alloc_page(GFP_KERNEL);
2370 if (!page)
2371 return NULL;
2372
2373 buf = page_address(page);
2374 buf->len = PAGE_SIZE;
2375
2376 return buf->data;
2377 }
2378
2379 /*
2380 * Free the space allocated in the bc_alloc routine
2381 */
2382 static void bc_free(void *buffer)
2383 {
2384 struct rpc_buffer *buf;
2385
2386 if (!buffer)
2387 return;
2388
2389 buf = container_of(buffer, struct rpc_buffer, data);
2390 free_page((unsigned long)buf);
2391 }
2392
2393 /*
2394 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2395 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2396 */
2397 static int bc_sendto(struct rpc_rqst *req)
2398 {
2399 int len;
2400 struct xdr_buf *xbufp = &req->rq_snd_buf;
2401 struct rpc_xprt *xprt = req->rq_xprt;
2402 struct sock_xprt *transport =
2403 container_of(xprt, struct sock_xprt, xprt);
2404 struct socket *sock = transport->sock;
2405 unsigned long headoff;
2406 unsigned long tailoff;
2407
2408 xs_encode_stream_record_marker(xbufp);
2409
2410 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2411 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2412 len = svc_send_common(sock, xbufp,
2413 virt_to_page(xbufp->head[0].iov_base), headoff,
2414 xbufp->tail[0].iov_base, tailoff);
2415
2416 if (len != xbufp->len) {
2417 printk(KERN_NOTICE "Error sending entire callback!\n");
2418 len = -EAGAIN;
2419 }
2420
2421 return len;
2422 }
2423
2424 /*
2425 * The send routine. Borrows from svc_send
2426 */
2427 static int bc_send_request(struct rpc_task *task)
2428 {
2429 struct rpc_rqst *req = task->tk_rqstp;
2430 struct svc_xprt *xprt;
2431 u32 len;
2432
2433 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2434 /*
2435 * Get the server socket associated with this callback xprt
2436 */
2437 xprt = req->rq_xprt->bc_xprt;
2438
2439 /*
2440 * Grab the mutex to serialize data as the connection is shared
2441 * with the fore channel
2442 */
2443 if (!mutex_trylock(&xprt->xpt_mutex)) {
2444 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2445 if (!mutex_trylock(&xprt->xpt_mutex))
2446 return -EAGAIN;
2447 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2448 }
2449 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2450 len = -ENOTCONN;
2451 else
2452 len = bc_sendto(req);
2453 mutex_unlock(&xprt->xpt_mutex);
2454
2455 if (len > 0)
2456 len = 0;
2457
2458 return len;
2459 }
2460
2461 /*
2462 * The close routine. Since this is client initiated, we do nothing
2463 */
2464
2465 static void bc_close(struct rpc_xprt *xprt)
2466 {
2467 }
2468
2469 /*
2470 * The xprt destroy routine. Again, because this connection is client
2471 * initiated, we do nothing
2472 */
2473
2474 static void bc_destroy(struct rpc_xprt *xprt)
2475 {
2476 }
2477
2478 static struct rpc_xprt_ops xs_local_ops = {
2479 .reserve_xprt = xprt_reserve_xprt,
2480 .release_xprt = xs_tcp_release_xprt,
2481 .alloc_slot = xprt_alloc_slot,
2482 .rpcbind = xs_local_rpcbind,
2483 .set_port = xs_local_set_port,
2484 .connect = xs_local_connect,
2485 .buf_alloc = rpc_malloc,
2486 .buf_free = rpc_free,
2487 .send_request = xs_local_send_request,
2488 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2489 .close = xs_close,
2490 .destroy = xs_local_destroy,
2491 .print_stats = xs_local_print_stats,
2492 };
2493
2494 static struct rpc_xprt_ops xs_udp_ops = {
2495 .set_buffer_size = xs_udp_set_buffer_size,
2496 .reserve_xprt = xprt_reserve_xprt_cong,
2497 .release_xprt = xprt_release_xprt_cong,
2498 .alloc_slot = xprt_alloc_slot,
2499 .rpcbind = rpcb_getport_async,
2500 .set_port = xs_set_port,
2501 .connect = xs_connect,
2502 .buf_alloc = rpc_malloc,
2503 .buf_free = rpc_free,
2504 .send_request = xs_udp_send_request,
2505 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2506 .timer = xs_udp_timer,
2507 .release_request = xprt_release_rqst_cong,
2508 .close = xs_close,
2509 .destroy = xs_destroy,
2510 .print_stats = xs_udp_print_stats,
2511 };
2512
2513 static struct rpc_xprt_ops xs_tcp_ops = {
2514 .reserve_xprt = xprt_reserve_xprt,
2515 .release_xprt = xs_tcp_release_xprt,
2516 .alloc_slot = xprt_lock_and_alloc_slot,
2517 .rpcbind = rpcb_getport_async,
2518 .set_port = xs_set_port,
2519 .connect = xs_connect,
2520 .buf_alloc = rpc_malloc,
2521 .buf_free = rpc_free,
2522 .send_request = xs_tcp_send_request,
2523 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2524 .close = xs_tcp_close,
2525 .destroy = xs_destroy,
2526 .print_stats = xs_tcp_print_stats,
2527 };
2528
2529 /*
2530 * The rpc_xprt_ops for the server backchannel
2531 */
2532
2533 static struct rpc_xprt_ops bc_tcp_ops = {
2534 .reserve_xprt = xprt_reserve_xprt,
2535 .release_xprt = xprt_release_xprt,
2536 .alloc_slot = xprt_alloc_slot,
2537 .rpcbind = xs_local_rpcbind,
2538 .buf_alloc = bc_malloc,
2539 .buf_free = bc_free,
2540 .send_request = bc_send_request,
2541 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2542 .close = bc_close,
2543 .destroy = bc_destroy,
2544 .print_stats = xs_tcp_print_stats,
2545 };
2546
2547 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2548 {
2549 static const struct sockaddr_in sin = {
2550 .sin_family = AF_INET,
2551 .sin_addr.s_addr = htonl(INADDR_ANY),
2552 };
2553 static const struct sockaddr_in6 sin6 = {
2554 .sin6_family = AF_INET6,
2555 .sin6_addr = IN6ADDR_ANY_INIT,
2556 };
2557
2558 switch (family) {
2559 case AF_LOCAL:
2560 break;
2561 case AF_INET:
2562 memcpy(sap, &sin, sizeof(sin));
2563 break;
2564 case AF_INET6:
2565 memcpy(sap, &sin6, sizeof(sin6));
2566 break;
2567 default:
2568 dprintk("RPC: %s: Bad address family\n", __func__);
2569 return -EAFNOSUPPORT;
2570 }
2571 return 0;
2572 }
2573
2574 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2575 unsigned int slot_table_size,
2576 unsigned int max_slot_table_size)
2577 {
2578 struct rpc_xprt *xprt;
2579 struct sock_xprt *new;
2580
2581 if (args->addrlen > sizeof(xprt->addr)) {
2582 dprintk("RPC: xs_setup_xprt: address too large\n");
2583 return ERR_PTR(-EBADF);
2584 }
2585
2586 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2587 max_slot_table_size);
2588 if (xprt == NULL) {
2589 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2590 "rpc_xprt\n");
2591 return ERR_PTR(-ENOMEM);
2592 }
2593
2594 new = container_of(xprt, struct sock_xprt, xprt);
2595 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2596 xprt->addrlen = args->addrlen;
2597 if (args->srcaddr)
2598 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2599 else {
2600 int err;
2601 err = xs_init_anyaddr(args->dstaddr->sa_family,
2602 (struct sockaddr *)&new->srcaddr);
2603 if (err != 0) {
2604 xprt_free(xprt);
2605 return ERR_PTR(err);
2606 }
2607 }
2608
2609 return xprt;
2610 }
2611
2612 static const struct rpc_timeout xs_local_default_timeout = {
2613 .to_initval = 10 * HZ,
2614 .to_maxval = 10 * HZ,
2615 .to_retries = 2,
2616 };
2617
2618 /**
2619 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2620 * @args: rpc transport creation arguments
2621 *
2622 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2623 */
2624 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2625 {
2626 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2627 struct sock_xprt *transport;
2628 struct rpc_xprt *xprt;
2629 struct rpc_xprt *ret;
2630
2631 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2632 xprt_max_tcp_slot_table_entries);
2633 if (IS_ERR(xprt))
2634 return xprt;
2635 transport = container_of(xprt, struct sock_xprt, xprt);
2636
2637 xprt->prot = 0;
2638 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2639 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2640
2641 xprt->bind_timeout = XS_BIND_TO;
2642 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2643 xprt->idle_timeout = XS_IDLE_DISC_TO;
2644
2645 xprt->ops = &xs_local_ops;
2646 xprt->timeout = &xs_local_default_timeout;
2647
2648 switch (sun->sun_family) {
2649 case AF_LOCAL:
2650 if (sun->sun_path[0] != '/') {
2651 dprintk("RPC: bad AF_LOCAL address: %s\n",
2652 sun->sun_path);
2653 ret = ERR_PTR(-EINVAL);
2654 goto out_err;
2655 }
2656 xprt_set_bound(xprt);
2657 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2658 ret = ERR_PTR(xs_local_setup_socket(transport));
2659 if (ret)
2660 goto out_err;
2661 break;
2662 default:
2663 ret = ERR_PTR(-EAFNOSUPPORT);
2664 goto out_err;
2665 }
2666
2667 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2668 xprt->address_strings[RPC_DISPLAY_ADDR]);
2669
2670 if (try_module_get(THIS_MODULE))
2671 return xprt;
2672 ret = ERR_PTR(-EINVAL);
2673 out_err:
2674 xprt_free(xprt);
2675 return ret;
2676 }
2677
2678 static const struct rpc_timeout xs_udp_default_timeout = {
2679 .to_initval = 5 * HZ,
2680 .to_maxval = 30 * HZ,
2681 .to_increment = 5 * HZ,
2682 .to_retries = 5,
2683 };
2684
2685 /**
2686 * xs_setup_udp - Set up transport to use a UDP socket
2687 * @args: rpc transport creation arguments
2688 *
2689 */
2690 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2691 {
2692 struct sockaddr *addr = args->dstaddr;
2693 struct rpc_xprt *xprt;
2694 struct sock_xprt *transport;
2695 struct rpc_xprt *ret;
2696
2697 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2698 xprt_udp_slot_table_entries);
2699 if (IS_ERR(xprt))
2700 return xprt;
2701 transport = container_of(xprt, struct sock_xprt, xprt);
2702
2703 xprt->prot = IPPROTO_UDP;
2704 xprt->tsh_size = 0;
2705 /* XXX: header size can vary due to auth type, IPv6, etc. */
2706 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2707
2708 xprt->bind_timeout = XS_BIND_TO;
2709 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2710 xprt->idle_timeout = XS_IDLE_DISC_TO;
2711
2712 xprt->ops = &xs_udp_ops;
2713
2714 xprt->timeout = &xs_udp_default_timeout;
2715
2716 switch (addr->sa_family) {
2717 case AF_INET:
2718 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2719 xprt_set_bound(xprt);
2720
2721 INIT_DELAYED_WORK(&transport->connect_worker,
2722 xs_udp_setup_socket);
2723 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2724 break;
2725 case AF_INET6:
2726 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2727 xprt_set_bound(xprt);
2728
2729 INIT_DELAYED_WORK(&transport->connect_worker,
2730 xs_udp_setup_socket);
2731 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2732 break;
2733 default:
2734 ret = ERR_PTR(-EAFNOSUPPORT);
2735 goto out_err;
2736 }
2737
2738 if (xprt_bound(xprt))
2739 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2740 xprt->address_strings[RPC_DISPLAY_ADDR],
2741 xprt->address_strings[RPC_DISPLAY_PORT],
2742 xprt->address_strings[RPC_DISPLAY_PROTO]);
2743 else
2744 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2745 xprt->address_strings[RPC_DISPLAY_ADDR],
2746 xprt->address_strings[RPC_DISPLAY_PROTO]);
2747
2748 if (try_module_get(THIS_MODULE))
2749 return xprt;
2750 ret = ERR_PTR(-EINVAL);
2751 out_err:
2752 xprt_free(xprt);
2753 return ret;
2754 }
2755
2756 static const struct rpc_timeout xs_tcp_default_timeout = {
2757 .to_initval = 60 * HZ,
2758 .to_maxval = 60 * HZ,
2759 .to_retries = 2,
2760 };
2761
2762 /**
2763 * xs_setup_tcp - Set up transport to use a TCP socket
2764 * @args: rpc transport creation arguments
2765 *
2766 */
2767 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2768 {
2769 struct sockaddr *addr = args->dstaddr;
2770 struct rpc_xprt *xprt;
2771 struct sock_xprt *transport;
2772 struct rpc_xprt *ret;
2773 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2774
2775 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2776 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2777
2778 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2779 max_slot_table_size);
2780 if (IS_ERR(xprt))
2781 return xprt;
2782 transport = container_of(xprt, struct sock_xprt, xprt);
2783
2784 xprt->prot = IPPROTO_TCP;
2785 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2786 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2787
2788 xprt->bind_timeout = XS_BIND_TO;
2789 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2790 xprt->idle_timeout = XS_IDLE_DISC_TO;
2791
2792 xprt->ops = &xs_tcp_ops;
2793 xprt->timeout = &xs_tcp_default_timeout;
2794
2795 switch (addr->sa_family) {
2796 case AF_INET:
2797 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2798 xprt_set_bound(xprt);
2799
2800 INIT_DELAYED_WORK(&transport->connect_worker,
2801 xs_tcp_setup_socket);
2802 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2803 break;
2804 case AF_INET6:
2805 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2806 xprt_set_bound(xprt);
2807
2808 INIT_DELAYED_WORK(&transport->connect_worker,
2809 xs_tcp_setup_socket);
2810 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2811 break;
2812 default:
2813 ret = ERR_PTR(-EAFNOSUPPORT);
2814 goto out_err;
2815 }
2816
2817 if (xprt_bound(xprt))
2818 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2819 xprt->address_strings[RPC_DISPLAY_ADDR],
2820 xprt->address_strings[RPC_DISPLAY_PORT],
2821 xprt->address_strings[RPC_DISPLAY_PROTO]);
2822 else
2823 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2824 xprt->address_strings[RPC_DISPLAY_ADDR],
2825 xprt->address_strings[RPC_DISPLAY_PROTO]);
2826
2827
2828 if (try_module_get(THIS_MODULE))
2829 return xprt;
2830 ret = ERR_PTR(-EINVAL);
2831 out_err:
2832 xprt_free(xprt);
2833 return ret;
2834 }
2835
2836 /**
2837 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2838 * @args: rpc transport creation arguments
2839 *
2840 */
2841 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2842 {
2843 struct sockaddr *addr = args->dstaddr;
2844 struct rpc_xprt *xprt;
2845 struct sock_xprt *transport;
2846 struct svc_sock *bc_sock;
2847 struct rpc_xprt *ret;
2848
2849 if (args->bc_xprt->xpt_bc_xprt) {
2850 /*
2851 * This server connection already has a backchannel
2852 * export; we can't create a new one, as we wouldn't be
2853 * able to match replies based on xid any more. So,
2854 * reuse the already-existing one:
2855 */
2856 return args->bc_xprt->xpt_bc_xprt;
2857 }
2858 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2859 xprt_tcp_slot_table_entries);
2860 if (IS_ERR(xprt))
2861 return xprt;
2862 transport = container_of(xprt, struct sock_xprt, xprt);
2863
2864 xprt->prot = IPPROTO_TCP;
2865 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2866 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2867 xprt->timeout = &xs_tcp_default_timeout;
2868
2869 /* backchannel */
2870 xprt_set_bound(xprt);
2871 xprt->bind_timeout = 0;
2872 xprt->reestablish_timeout = 0;
2873 xprt->idle_timeout = 0;
2874
2875 xprt->ops = &bc_tcp_ops;
2876
2877 switch (addr->sa_family) {
2878 case AF_INET:
2879 xs_format_peer_addresses(xprt, "tcp",
2880 RPCBIND_NETID_TCP);
2881 break;
2882 case AF_INET6:
2883 xs_format_peer_addresses(xprt, "tcp",
2884 RPCBIND_NETID_TCP6);
2885 break;
2886 default:
2887 ret = ERR_PTR(-EAFNOSUPPORT);
2888 goto out_err;
2889 }
2890
2891 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2892 xprt->address_strings[RPC_DISPLAY_ADDR],
2893 xprt->address_strings[RPC_DISPLAY_PORT],
2894 xprt->address_strings[RPC_DISPLAY_PROTO]);
2895
2896 /*
2897 * Once we've associated a backchannel xprt with a connection,
2898 * we want to keep it around as long as long as the connection
2899 * lasts, in case we need to start using it for a backchannel
2900 * again; this reference won't be dropped until bc_xprt is
2901 * destroyed.
2902 */
2903 xprt_get(xprt);
2904 args->bc_xprt->xpt_bc_xprt = xprt;
2905 xprt->bc_xprt = args->bc_xprt;
2906 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2907 transport->sock = bc_sock->sk_sock;
2908 transport->inet = bc_sock->sk_sk;
2909
2910 /*
2911 * Since we don't want connections for the backchannel, we set
2912 * the xprt status to connected
2913 */
2914 xprt_set_connected(xprt);
2915
2916
2917 if (try_module_get(THIS_MODULE))
2918 return xprt;
2919 xprt_put(xprt);
2920 ret = ERR_PTR(-EINVAL);
2921 out_err:
2922 xprt_free(xprt);
2923 return ret;
2924 }
2925
2926 static struct xprt_class xs_local_transport = {
2927 .list = LIST_HEAD_INIT(xs_local_transport.list),
2928 .name = "named UNIX socket",
2929 .owner = THIS_MODULE,
2930 .ident = XPRT_TRANSPORT_LOCAL,
2931 .setup = xs_setup_local,
2932 };
2933
2934 static struct xprt_class xs_udp_transport = {
2935 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2936 .name = "udp",
2937 .owner = THIS_MODULE,
2938 .ident = XPRT_TRANSPORT_UDP,
2939 .setup = xs_setup_udp,
2940 };
2941
2942 static struct xprt_class xs_tcp_transport = {
2943 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2944 .name = "tcp",
2945 .owner = THIS_MODULE,
2946 .ident = XPRT_TRANSPORT_TCP,
2947 .setup = xs_setup_tcp,
2948 };
2949
2950 static struct xprt_class xs_bc_tcp_transport = {
2951 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2952 .name = "tcp NFSv4.1 backchannel",
2953 .owner = THIS_MODULE,
2954 .ident = XPRT_TRANSPORT_BC_TCP,
2955 .setup = xs_setup_bc_tcp,
2956 };
2957
2958 /**
2959 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2960 *
2961 */
2962 int init_socket_xprt(void)
2963 {
2964 #ifdef RPC_DEBUG
2965 if (!sunrpc_table_header)
2966 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2967 #endif
2968
2969 xprt_register_transport(&xs_local_transport);
2970 xprt_register_transport(&xs_udp_transport);
2971 xprt_register_transport(&xs_tcp_transport);
2972 xprt_register_transport(&xs_bc_tcp_transport);
2973
2974 return 0;
2975 }
2976
2977 /**
2978 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2979 *
2980 */
2981 void cleanup_socket_xprt(void)
2982 {
2983 #ifdef RPC_DEBUG
2984 if (sunrpc_table_header) {
2985 unregister_sysctl_table(sunrpc_table_header);
2986 sunrpc_table_header = NULL;
2987 }
2988 #endif
2989
2990 xprt_unregister_transport(&xs_local_transport);
2991 xprt_unregister_transport(&xs_udp_transport);
2992 xprt_unregister_transport(&xs_tcp_transport);
2993 xprt_unregister_transport(&xs_bc_tcp_transport);
2994 }
2995
2996 static int param_set_uint_minmax(const char *val,
2997 const struct kernel_param *kp,
2998 unsigned int min, unsigned int max)
2999 {
3000 unsigned long num;
3001 int ret;
3002
3003 if (!val)
3004 return -EINVAL;
3005 ret = strict_strtoul(val, 0, &num);
3006 if (ret == -EINVAL || num < min || num > max)
3007 return -EINVAL;
3008 *((unsigned int *)kp->arg) = num;
3009 return 0;
3010 }
3011
3012 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3013 {
3014 return param_set_uint_minmax(val, kp,
3015 RPC_MIN_RESVPORT,
3016 RPC_MAX_RESVPORT);
3017 }
3018
3019 static struct kernel_param_ops param_ops_portnr = {
3020 .set = param_set_portnr,
3021 .get = param_get_uint,
3022 };
3023
3024 #define param_check_portnr(name, p) \
3025 __param_check(name, p, unsigned int);
3026
3027 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3028 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3029
3030 static int param_set_slot_table_size(const char *val,
3031 const struct kernel_param *kp)
3032 {
3033 return param_set_uint_minmax(val, kp,
3034 RPC_MIN_SLOT_TABLE,
3035 RPC_MAX_SLOT_TABLE);
3036 }
3037
3038 static struct kernel_param_ops param_ops_slot_table_size = {
3039 .set = param_set_slot_table_size,
3040 .get = param_get_uint,
3041 };
3042
3043 #define param_check_slot_table_size(name, p) \
3044 __param_check(name, p, unsigned int);
3045
3046 static int param_set_max_slot_table_size(const char *val,
3047 const struct kernel_param *kp)
3048 {
3049 return param_set_uint_minmax(val, kp,
3050 RPC_MIN_SLOT_TABLE,
3051 RPC_MAX_SLOT_TABLE_LIMIT);
3052 }
3053
3054 static struct kernel_param_ops param_ops_max_slot_table_size = {
3055 .set = param_set_max_slot_table_size,
3056 .get = param_get_uint,
3057 };
3058
3059 #define param_check_max_slot_table_size(name, p) \
3060 __param_check(name, p, unsigned int);
3061
3062 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3063 slot_table_size, 0644);
3064 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3065 max_slot_table_size, 0644);
3066 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3067 slot_table_size, 0644);
3068
Linus' kernel tree