?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
compat_ioctl: Add RS-485 IOCTLs to the list
[linux-2.6.git] / net / sunrpc / xprtsock.c
bloba35b8e52e551d4b931110a78727604c8d6af8283
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/net.h>
31 #include <linux/mm.h>
32 #include <linux/un.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/sched.h>
37 #include <linux/sunrpc/svcsock.h>
38 #include <linux/sunrpc/xprtsock.h>
39 #include <linux/file.h>
40 #ifdef CONFIG_SUNRPC_BACKCHANNEL
41 #include <linux/sunrpc/bc_xprt.h>
42 #endif
43
44 #include <net/sock.h>
45 #include <net/checksum.h>
46 #include <net/udp.h>
47 #include <net/tcp.h>
48
49 #include "sunrpc.h"
50
51 static void xs_close(struct rpc_xprt *xprt);
52
53 /*
54 * xprtsock tunables
55 */
56 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
57 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
58 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
59
60 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
61 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
62
63 #define XS_TCP_LINGER_TO (15U * HZ)
64 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
65
66 /*
67 * We can register our own files under /proc/sys/sunrpc by
68 * calling register_sysctl_table() again. The files in that
69 * directory become the union of all files registered there.
70 *
71 * We simply need to make sure that we don't collide with
72 * someone else's file names!
73 */
74
75 #ifdef RPC_DEBUG
76
77 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
78 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
79 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
80 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
81 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
82
83 static struct ctl_table_header *sunrpc_table_header;
84
85 /*
86 * FIXME: changing the UDP slot table size should also resize the UDP
87 * socket buffers for existing UDP transports
88 */
89 static ctl_table xs_tunables_table[] = {
90 {
91 .procname = "udp_slot_table_entries",
92 .data = &xprt_udp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
95 .proc_handler = proc_dointvec_minmax,
96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
100 .procname = "tcp_slot_table_entries",
101 .data = &xprt_tcp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
104 .proc_handler = proc_dointvec_minmax,
105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
109 .procname = "tcp_max_slot_table_entries",
110 .data = &xprt_max_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_tcp_slot_table_limit
116 },
117 {
118 .procname = "min_resvport",
119 .data = &xprt_min_resvport,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec_minmax,
123 .extra1 = &xprt_min_resvport_limit,
124 .extra2 = &xprt_max_resvport_limit
125 },
126 {
127 .procname = "max_resvport",
128 .data = &xprt_max_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_minmax,
132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
135 {
136 .procname = "tcp_fin_timeout",
137 .data = &xs_tcp_fin_timeout,
138 .maxlen = sizeof(xs_tcp_fin_timeout),
139 .mode = 0644,
140 .proc_handler = proc_dointvec_jiffies,
141 },
142 { },
143 };
144
145 static ctl_table sunrpc_table[] = {
146 {
147 .procname = "sunrpc",
148 .mode = 0555,
149 .child = xs_tunables_table
150 },
151 { },
152 };
153
154 #endif
155
156 /*
157 * Wait duration for a reply from the RPC portmapper.
158 */
159 #define XS_BIND_TO (60U * HZ)
160
161 /*
162 * Delay if a UDP socket connect error occurs. This is most likely some
163 * kind of resource problem on the local host.
164 */
165 #define XS_UDP_REEST_TO (2U * HZ)
166
167 /*
168 * The reestablish timeout allows clients to delay for a bit before attempting
169 * to reconnect to a server that just dropped our connection.
170 *
171 * We implement an exponential backoff when trying to reestablish a TCP
172 * transport connection with the server. Some servers like to drop a TCP
173 * connection when they are overworked, so we start with a short timeout and
174 * increase over time if the server is down or not responding.
175 */
176 #define XS_TCP_INIT_REEST_TO (3U * HZ)
177 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178
179 /*
180 * TCP idle timeout; client drops the transport socket if it is idle
181 * for this long. Note that we also timeout UDP sockets to prevent
182 * holding port numbers when there is no RPC traffic.
183 */
184 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
185
186 #ifdef RPC_DEBUG
187 # undef RPC_DEBUG_DATA
188 # define RPCDBG_FACILITY RPCDBG_TRANS
189 #endif
190
191 #ifdef RPC_DEBUG_DATA
192 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
193 {
194 u8 *buf = (u8 *) packet;
195 int j;
196
197 dprintk("RPC: %s\n", msg);
198 for (j = 0; j < count && j < 128; j += 4) {
199 if (!(j & 31)) {
200 if (j)
201 dprintk("\n");
202 dprintk("0x%04x ", j);
203 }
204 dprintk("%02x%02x%02x%02x ",
205 buf[j], buf[j+1], buf[j+2], buf[j+3]);
206 }
207 dprintk("\n");
208 }
209 #else
210 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
211 {
212 /* NOP */
213 }
214 #endif
215
216 struct sock_xprt {
217 struct rpc_xprt xprt;
218
219 /*
220 * Network layer
221 */
222 struct socket * sock;
223 struct sock * inet;
224
225 /*
226 * State of TCP reply receive
227 */
228 __be32 tcp_fraghdr,
229 tcp_xid,
230 tcp_calldir;
231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
237
238 /*
239 * Connection of transports
240 */
241 struct delayed_work connect_worker;
242 struct sockaddr_storage srcaddr;
243 unsigned short srcport;
244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
257 void (*old_error_report)(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 case -EPIPE:
741 xs_tcp_shutdown(xprt);
742 case -ECONNREFUSED:
743 case -ENOTCONN:
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, &task->tk_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 transport->old_error_report = sk->sk_error_report;
785 }
786
787 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
788 {
789 sk->sk_data_ready = transport->old_data_ready;
790 sk->sk_state_change = transport->old_state_change;
791 sk->sk_write_space = transport->old_write_space;
792 sk->sk_error_report = transport->old_error_report;
793 }
794
795 static void xs_reset_transport(struct sock_xprt *transport)
796 {
797 struct socket *sock = transport->sock;
798 struct sock *sk = transport->inet;
799
800 if (sk == NULL)
801 return;
802
803 transport->srcport = 0;
804
805 write_lock_bh(&sk->sk_callback_lock);
806 transport->inet = NULL;
807 transport->sock = NULL;
808
809 sk->sk_user_data = NULL;
810
811 xs_restore_old_callbacks(transport, sk);
812 write_unlock_bh(&sk->sk_callback_lock);
813
814 sk->sk_no_check = 0;
815
816 sock_release(sock);
817 }
818
819 /**
820 * xs_close - close a socket
821 * @xprt: transport
822 *
823 * This is used when all requests are complete; ie, no DRC state remains
824 * on the server we want to save.
825 *
826 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
827 * xs_reset_transport() zeroing the socket from underneath a writer.
828 */
829 static void xs_close(struct rpc_xprt *xprt)
830 {
831 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
832
833 dprintk("RPC: xs_close xprt %p\n", xprt);
834
835 xs_reset_transport(transport);
836 xprt->reestablish_timeout = 0;
837
838 smp_mb__before_clear_bit();
839 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
840 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
841 clear_bit(XPRT_CLOSING, &xprt->state);
842 smp_mb__after_clear_bit();
843 xprt_disconnect_done(xprt);
844 }
845
846 static void xs_tcp_close(struct rpc_xprt *xprt)
847 {
848 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
849 xs_close(xprt);
850 else
851 xs_tcp_shutdown(xprt);
852 }
853
854 /**
855 * xs_destroy - prepare to shutdown a transport
856 * @xprt: doomed transport
857 *
858 */
859 static void xs_destroy(struct rpc_xprt *xprt)
860 {
861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
862
863 dprintk("RPC: xs_destroy xprt %p\n", xprt);
864
865 cancel_delayed_work_sync(&transport->connect_worker);
866
867 xs_close(xprt);
868 xs_free_peer_addresses(xprt);
869 xprt_free(xprt);
870 module_put(THIS_MODULE);
871 }
872
873 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
874 {
875 return (struct rpc_xprt *) sk->sk_user_data;
876 }
877
878 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
879 {
880 struct xdr_skb_reader desc = {
881 .skb = skb,
882 .offset = sizeof(rpc_fraghdr),
883 .count = skb->len - sizeof(rpc_fraghdr),
884 };
885
886 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
887 return -1;
888 if (desc.count)
889 return -1;
890 return 0;
891 }
892
893 /**
894 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
895 * @sk: socket with data to read
896 * @len: how much data to read
897 *
898 * Currently this assumes we can read the whole reply in a single gulp.
899 */
900 static void xs_local_data_ready(struct sock *sk, int len)
901 {
902 struct rpc_task *task;
903 struct rpc_xprt *xprt;
904 struct rpc_rqst *rovr;
905 struct sk_buff *skb;
906 int err, repsize, copied;
907 u32 _xid;
908 __be32 *xp;
909
910 read_lock_bh(&sk->sk_callback_lock);
911 dprintk("RPC: %s...\n", __func__);
912 xprt = xprt_from_sock(sk);
913 if (xprt == NULL)
914 goto out;
915
916 skb = skb_recv_datagram(sk, 0, 1, &err);
917 if (skb == NULL)
918 goto out;
919
920 if (xprt->shutdown)
921 goto dropit;
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 if (xprt->shutdown)
985 goto dropit;
986
987 repsize = skb->len - sizeof(struct udphdr);
988 if (repsize < 4) {
989 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
990 goto dropit;
991 }
992
993 /* Copy the XID from the skb... */
994 xp = skb_header_pointer(skb, sizeof(struct udphdr),
995 sizeof(_xid), &_xid);
996 if (xp == NULL)
997 goto dropit;
998
999 /* Look up and lock the request corresponding to the given XID */
1000 spin_lock(&xprt->transport_lock);
1001 rovr = xprt_lookup_rqst(xprt, *xp);
1002 if (!rovr)
1003 goto out_unlock;
1004 task = rovr->rq_task;
1005
1006 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1007 copied = repsize;
1008
1009 /* Suck it into the iovec, verify checksum if not done by hw. */
1010 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1011 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1012 goto out_unlock;
1013 }
1014
1015 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1016
1017 xprt_adjust_cwnd(task, copied);
1018 xprt_complete_rqst(task, copied);
1019
1020 out_unlock:
1021 spin_unlock(&xprt->transport_lock);
1022 dropit:
1023 skb_free_datagram(sk, skb);
1024 out:
1025 read_unlock_bh(&sk->sk_callback_lock);
1026 }
1027
1028 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1029 {
1030 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1031 size_t len, used;
1032 char *p;
1033
1034 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1035 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1036 used = xdr_skb_read_bits(desc, p, len);
1037 transport->tcp_offset += used;
1038 if (used != len)
1039 return;
1040
1041 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1042 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1043 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1044 else
1045 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1046 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1047
1048 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1049 transport->tcp_offset = 0;
1050
1051 /* Sanity check of the record length */
1052 if (unlikely(transport->tcp_reclen < 8)) {
1053 dprintk("RPC: invalid TCP record fragment length\n");
1054 xprt_force_disconnect(xprt);
1055 return;
1056 }
1057 dprintk("RPC: reading TCP record fragment of length %d\n",
1058 transport->tcp_reclen);
1059 }
1060
1061 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1062 {
1063 if (transport->tcp_offset == transport->tcp_reclen) {
1064 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1065 transport->tcp_offset = 0;
1066 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1067 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1068 transport->tcp_flags |= TCP_RCV_COPY_XID;
1069 transport->tcp_copied = 0;
1070 }
1071 }
1072 }
1073
1074 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1075 {
1076 size_t len, used;
1077 char *p;
1078
1079 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1080 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1081 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1082 used = xdr_skb_read_bits(desc, p, len);
1083 transport->tcp_offset += used;
1084 if (used != len)
1085 return;
1086 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1087 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1088 transport->tcp_copied = 4;
1089 dprintk("RPC: reading %s XID %08x\n",
1090 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1091 : "request with",
1092 ntohl(transport->tcp_xid));
1093 xs_tcp_check_fraghdr(transport);
1094 }
1095
1096 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1097 struct xdr_skb_reader *desc)
1098 {
1099 size_t len, used;
1100 u32 offset;
1101 char *p;
1102
1103 /*
1104 * We want transport->tcp_offset to be 8 at the end of this routine
1105 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1106 * When this function is called for the first time,
1107 * transport->tcp_offset is 4 (after having already read the xid).
1108 */
1109 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1110 len = sizeof(transport->tcp_calldir) - offset;
1111 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1112 p = ((char *) &transport->tcp_calldir) + offset;
1113 used = xdr_skb_read_bits(desc, p, len);
1114 transport->tcp_offset += used;
1115 if (used != len)
1116 return;
1117 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1118 /*
1119 * We don't yet have the XDR buffer, so we will write the calldir
1120 * out after we get the buffer from the 'struct rpc_rqst'
1121 */
1122 switch (ntohl(transport->tcp_calldir)) {
1123 case RPC_REPLY:
1124 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1125 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1126 transport->tcp_flags |= TCP_RPC_REPLY;
1127 break;
1128 case RPC_CALL:
1129 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1130 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1131 transport->tcp_flags &= ~TCP_RPC_REPLY;
1132 break;
1133 default:
1134 dprintk("RPC: invalid request message type\n");
1135 xprt_force_disconnect(&transport->xprt);
1136 }
1137 xs_tcp_check_fraghdr(transport);
1138 }
1139
1140 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1141 struct xdr_skb_reader *desc,
1142 struct rpc_rqst *req)
1143 {
1144 struct sock_xprt *transport =
1145 container_of(xprt, struct sock_xprt, xprt);
1146 struct xdr_buf *rcvbuf;
1147 size_t len;
1148 ssize_t r;
1149
1150 rcvbuf = &req->rq_private_buf;
1151
1152 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1153 /*
1154 * Save the RPC direction in the XDR buffer
1155 */
1156 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1157 &transport->tcp_calldir,
1158 sizeof(transport->tcp_calldir));
1159 transport->tcp_copied += sizeof(transport->tcp_calldir);
1160 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1161 }
1162
1163 len = desc->count;
1164 if (len > transport->tcp_reclen - transport->tcp_offset) {
1165 struct xdr_skb_reader my_desc;
1166
1167 len = transport->tcp_reclen - transport->tcp_offset;
1168 memcpy(&my_desc, desc, sizeof(my_desc));
1169 my_desc.count = len;
1170 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1171 &my_desc, xdr_skb_read_bits);
1172 desc->count -= r;
1173 desc->offset += r;
1174 } else
1175 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1176 desc, xdr_skb_read_bits);
1177
1178 if (r > 0) {
1179 transport->tcp_copied += r;
1180 transport->tcp_offset += r;
1181 }
1182 if (r != len) {
1183 /* Error when copying to the receive buffer,
1184 * usually because we weren't able to allocate
1185 * additional buffer pages. All we can do now
1186 * is turn off TCP_RCV_COPY_DATA, so the request
1187 * will not receive any additional updates,
1188 * and time out.
1189 * Any remaining data from this record will
1190 * be discarded.
1191 */
1192 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1193 dprintk("RPC: XID %08x truncated request\n",
1194 ntohl(transport->tcp_xid));
1195 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1196 "tcp_offset = %u, tcp_reclen = %u\n",
1197 xprt, transport->tcp_copied,
1198 transport->tcp_offset, transport->tcp_reclen);
1199 return;
1200 }
1201
1202 dprintk("RPC: XID %08x read %Zd bytes\n",
1203 ntohl(transport->tcp_xid), r);
1204 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1205 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1206 transport->tcp_offset, transport->tcp_reclen);
1207
1208 if (transport->tcp_copied == req->rq_private_buf.buflen)
1209 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1210 else if (transport->tcp_offset == transport->tcp_reclen) {
1211 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1212 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1213 }
1214 }
1215
1216 /*
1217 * Finds the request corresponding to the RPC xid and invokes the common
1218 * tcp read code to read the data.
1219 */
1220 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1221 struct xdr_skb_reader *desc)
1222 {
1223 struct sock_xprt *transport =
1224 container_of(xprt, struct sock_xprt, xprt);
1225 struct rpc_rqst *req;
1226
1227 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1228
1229 /* Find and lock the request corresponding to this xid */
1230 spin_lock(&xprt->transport_lock);
1231 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1232 if (!req) {
1233 dprintk("RPC: XID %08x request not found!\n",
1234 ntohl(transport->tcp_xid));
1235 spin_unlock(&xprt->transport_lock);
1236 return -1;
1237 }
1238
1239 xs_tcp_read_common(xprt, desc, req);
1240
1241 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1242 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1243
1244 spin_unlock(&xprt->transport_lock);
1245 return 0;
1246 }
1247
1248 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1249 /*
1250 * Obtains an rpc_rqst previously allocated and invokes the common
1251 * tcp read code to read the data. The result is placed in the callback
1252 * queue.
1253 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1254 * connection and return -1.
1255 */
1256 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1257 struct xdr_skb_reader *desc)
1258 {
1259 struct sock_xprt *transport =
1260 container_of(xprt, struct sock_xprt, xprt);
1261 struct rpc_rqst *req;
1262
1263 req = xprt_alloc_bc_request(xprt);
1264 if (req == NULL) {
1265 printk(KERN_WARNING "Callback slot table overflowed\n");
1266 xprt_force_disconnect(xprt);
1267 return -1;
1268 }
1269
1270 req->rq_xid = transport->tcp_xid;
1271 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1272 xs_tcp_read_common(xprt, desc, req);
1273
1274 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1275 struct svc_serv *bc_serv = xprt->bc_serv;
1276
1277 /*
1278 * Add callback request to callback list. The callback
1279 * service sleeps on the sv_cb_waitq waiting for new
1280 * requests. Wake it up after adding enqueing the
1281 * request.
1282 */
1283 dprintk("RPC: add callback request to list\n");
1284 spin_lock(&bc_serv->sv_cb_lock);
1285 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1286 spin_unlock(&bc_serv->sv_cb_lock);
1287 wake_up(&bc_serv->sv_cb_waitq);
1288 }
1289
1290 req->rq_private_buf.len = transport->tcp_copied;
1291
1292 return 0;
1293 }
1294
1295 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1296 struct xdr_skb_reader *desc)
1297 {
1298 struct sock_xprt *transport =
1299 container_of(xprt, struct sock_xprt, xprt);
1300
1301 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1302 xs_tcp_read_reply(xprt, desc) :
1303 xs_tcp_read_callback(xprt, desc);
1304 }
1305 #else
1306 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1307 struct xdr_skb_reader *desc)
1308 {
1309 return xs_tcp_read_reply(xprt, desc);
1310 }
1311 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1312
1313 /*
1314 * Read data off the transport. This can be either an RPC_CALL or an
1315 * RPC_REPLY. Relay the processing to helper functions.
1316 */
1317 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1318 struct xdr_skb_reader *desc)
1319 {
1320 struct sock_xprt *transport =
1321 container_of(xprt, struct sock_xprt, xprt);
1322
1323 if (_xs_tcp_read_data(xprt, desc) == 0)
1324 xs_tcp_check_fraghdr(transport);
1325 else {
1326 /*
1327 * The transport_lock protects the request handling.
1328 * There's no need to hold it to update the tcp_flags.
1329 */
1330 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1331 }
1332 }
1333
1334 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1335 {
1336 size_t len;
1337
1338 len = transport->tcp_reclen - transport->tcp_offset;
1339 if (len > desc->count)
1340 len = desc->count;
1341 desc->count -= len;
1342 desc->offset += len;
1343 transport->tcp_offset += len;
1344 dprintk("RPC: discarded %Zu bytes\n", len);
1345 xs_tcp_check_fraghdr(transport);
1346 }
1347
1348 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1349 {
1350 struct rpc_xprt *xprt = rd_desc->arg.data;
1351 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1352 struct xdr_skb_reader desc = {
1353 .skb = skb,
1354 .offset = offset,
1355 .count = len,
1356 };
1357
1358 dprintk("RPC: xs_tcp_data_recv started\n");
1359 do {
1360 /* Read in a new fragment marker if necessary */
1361 /* Can we ever really expect to get completely empty fragments? */
1362 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1363 xs_tcp_read_fraghdr(xprt, &desc);
1364 continue;
1365 }
1366 /* Read in the xid if necessary */
1367 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1368 xs_tcp_read_xid(transport, &desc);
1369 continue;
1370 }
1371 /* Read in the call/reply flag */
1372 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1373 xs_tcp_read_calldir(transport, &desc);
1374 continue;
1375 }
1376 /* Read in the request data */
1377 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1378 xs_tcp_read_data(xprt, &desc);
1379 continue;
1380 }
1381 /* Skip over any trailing bytes on short reads */
1382 xs_tcp_read_discard(transport, &desc);
1383 } while (desc.count);
1384 dprintk("RPC: xs_tcp_data_recv done\n");
1385 return len - desc.count;
1386 }
1387
1388 /**
1389 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1390 * @sk: socket with data to read
1391 * @bytes: how much data to read
1392 *
1393 */
1394 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1395 {
1396 struct rpc_xprt *xprt;
1397 read_descriptor_t rd_desc;
1398 int read;
1399
1400 dprintk("RPC: xs_tcp_data_ready...\n");
1401
1402 read_lock_bh(&sk->sk_callback_lock);
1403 if (!(xprt = xprt_from_sock(sk)))
1404 goto out;
1405 if (xprt->shutdown)
1406 goto out;
1407
1408 /* Any data means we had a useful conversation, so
1409 * the we don't need to delay the next reconnect
1410 */
1411 if (xprt->reestablish_timeout)
1412 xprt->reestablish_timeout = 0;
1413
1414 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1415 rd_desc.arg.data = xprt;
1416 do {
1417 rd_desc.count = 65536;
1418 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1419 } while (read > 0);
1420 out:
1421 read_unlock_bh(&sk->sk_callback_lock);
1422 }
1423
1424 /*
1425 * Do the equivalent of linger/linger2 handling for dealing with
1426 * broken servers that don't close the socket in a timely
1427 * fashion
1428 */
1429 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1430 unsigned long timeout)
1431 {
1432 struct sock_xprt *transport;
1433
1434 if (xprt_test_and_set_connecting(xprt))
1435 return;
1436 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1437 transport = container_of(xprt, struct sock_xprt, xprt);
1438 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1439 timeout);
1440 }
1441
1442 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1443 {
1444 struct sock_xprt *transport;
1445
1446 transport = container_of(xprt, struct sock_xprt, xprt);
1447
1448 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1449 !cancel_delayed_work(&transport->connect_worker))
1450 return;
1451 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1452 xprt_clear_connecting(xprt);
1453 }
1454
1455 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1456 {
1457 smp_mb__before_clear_bit();
1458 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1459 clear_bit(XPRT_CLOSING, &xprt->state);
1460 smp_mb__after_clear_bit();
1461 /* Mark transport as closed and wake up all pending tasks */
1462 xprt_disconnect_done(xprt);
1463 }
1464
1465 /**
1466 * xs_tcp_state_change - callback to handle TCP socket state changes
1467 * @sk: socket whose state has changed
1468 *
1469 */
1470 static void xs_tcp_state_change(struct sock *sk)
1471 {
1472 struct rpc_xprt *xprt;
1473
1474 read_lock_bh(&sk->sk_callback_lock);
1475 if (!(xprt = xprt_from_sock(sk)))
1476 goto out;
1477 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1478 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1479 sk->sk_state, xprt_connected(xprt),
1480 sock_flag(sk, SOCK_DEAD),
1481 sock_flag(sk, SOCK_ZAPPED),
1482 sk->sk_shutdown);
1483
1484 switch (sk->sk_state) {
1485 case TCP_ESTABLISHED:
1486 spin_lock(&xprt->transport_lock);
1487 if (!xprt_test_and_set_connected(xprt)) {
1488 struct sock_xprt *transport = container_of(xprt,
1489 struct sock_xprt, xprt);
1490
1491 /* Reset TCP record info */
1492 transport->tcp_offset = 0;
1493 transport->tcp_reclen = 0;
1494 transport->tcp_copied = 0;
1495 transport->tcp_flags =
1496 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1497
1498 xprt_wake_pending_tasks(xprt, -EAGAIN);
1499 }
1500 spin_unlock(&xprt->transport_lock);
1501 break;
1502 case TCP_FIN_WAIT1:
1503 /* The client initiated a shutdown of the socket */
1504 xprt->connect_cookie++;
1505 xprt->reestablish_timeout = 0;
1506 set_bit(XPRT_CLOSING, &xprt->state);
1507 smp_mb__before_clear_bit();
1508 clear_bit(XPRT_CONNECTED, &xprt->state);
1509 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1510 smp_mb__after_clear_bit();
1511 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1512 break;
1513 case TCP_CLOSE_WAIT:
1514 /* The server initiated a shutdown of the socket */
1515 xprt_force_disconnect(xprt);
1516 xprt->connect_cookie++;
1517 case TCP_CLOSING:
1518 /*
1519 * If the server closed down the connection, make sure that
1520 * we back off before reconnecting
1521 */
1522 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1523 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1524 break;
1525 case TCP_LAST_ACK:
1526 set_bit(XPRT_CLOSING, &xprt->state);
1527 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1528 smp_mb__before_clear_bit();
1529 clear_bit(XPRT_CONNECTED, &xprt->state);
1530 smp_mb__after_clear_bit();
1531 break;
1532 case TCP_CLOSE:
1533 xs_tcp_cancel_linger_timeout(xprt);
1534 xs_sock_mark_closed(xprt);
1535 }
1536 out:
1537 read_unlock_bh(&sk->sk_callback_lock);
1538 }
1539
1540 /**
1541 * xs_error_report - callback mainly for catching socket errors
1542 * @sk: socket
1543 */
1544 static void xs_error_report(struct sock *sk)
1545 {
1546 struct rpc_xprt *xprt;
1547
1548 read_lock_bh(&sk->sk_callback_lock);
1549 if (!(xprt = xprt_from_sock(sk)))
1550 goto out;
1551 dprintk("RPC: %s client %p...\n"
1552 "RPC: error %d\n",
1553 __func__, xprt, sk->sk_err);
1554 xprt_wake_pending_tasks(xprt, -EAGAIN);
1555 out:
1556 read_unlock_bh(&sk->sk_callback_lock);
1557 }
1558
1559 static void xs_write_space(struct sock *sk)
1560 {
1561 struct socket *sock;
1562 struct rpc_xprt *xprt;
1563
1564 if (unlikely(!(sock = sk->sk_socket)))
1565 return;
1566 clear_bit(SOCK_NOSPACE, &sock->flags);
1567
1568 if (unlikely(!(xprt = xprt_from_sock(sk))))
1569 return;
1570 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1571 return;
1572
1573 xprt_write_space(xprt);
1574 }
1575
1576 /**
1577 * xs_udp_write_space - callback invoked when socket buffer space
1578 * becomes available
1579 * @sk: socket whose state has changed
1580 *
1581 * Called when more output buffer space is available for this socket.
1582 * We try not to wake our writers until they can make "significant"
1583 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1584 * with a bunch of small requests.
1585 */
1586 static void xs_udp_write_space(struct sock *sk)
1587 {
1588 read_lock_bh(&sk->sk_callback_lock);
1589
1590 /* from net/core/sock.c:sock_def_write_space */
1591 if (sock_writeable(sk))
1592 xs_write_space(sk);
1593
1594 read_unlock_bh(&sk->sk_callback_lock);
1595 }
1596
1597 /**
1598 * xs_tcp_write_space - callback invoked when socket buffer space
1599 * becomes available
1600 * @sk: socket whose state has changed
1601 *
1602 * Called when more output buffer space is available for this socket.
1603 * We try not to wake our writers until they can make "significant"
1604 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1605 * with a bunch of small requests.
1606 */
1607 static void xs_tcp_write_space(struct sock *sk)
1608 {
1609 read_lock_bh(&sk->sk_callback_lock);
1610
1611 /* from net/core/stream.c:sk_stream_write_space */
1612 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1613 xs_write_space(sk);
1614
1615 read_unlock_bh(&sk->sk_callback_lock);
1616 }
1617
1618 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1619 {
1620 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1621 struct sock *sk = transport->inet;
1622
1623 if (transport->rcvsize) {
1624 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1625 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1626 }
1627 if (transport->sndsize) {
1628 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1629 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1630 sk->sk_write_space(sk);
1631 }
1632 }
1633
1634 /**
1635 * xs_udp_set_buffer_size - set send and receive limits
1636 * @xprt: generic transport
1637 * @sndsize: requested size of send buffer, in bytes
1638 * @rcvsize: requested size of receive buffer, in bytes
1639 *
1640 * Set socket send and receive buffer size limits.
1641 */
1642 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1643 {
1644 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1645
1646 transport->sndsize = 0;
1647 if (sndsize)
1648 transport->sndsize = sndsize + 1024;
1649 transport->rcvsize = 0;
1650 if (rcvsize)
1651 transport->rcvsize = rcvsize + 1024;
1652
1653 xs_udp_do_set_buffer_size(xprt);
1654 }
1655
1656 /**
1657 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1658 * @task: task that timed out
1659 *
1660 * Adjust the congestion window after a retransmit timeout has occurred.
1661 */
1662 static void xs_udp_timer(struct rpc_task *task)
1663 {
1664 xprt_adjust_cwnd(task, -ETIMEDOUT);
1665 }
1666
1667 static unsigned short xs_get_random_port(void)
1668 {
1669 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1670 unsigned short rand = (unsigned short) net_random() % range;
1671 return rand + xprt_min_resvport;
1672 }
1673
1674 /**
1675 * xs_set_port - reset the port number in the remote endpoint address
1676 * @xprt: generic transport
1677 * @port: new port number
1678 *
1679 */
1680 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1681 {
1682 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1683
1684 rpc_set_port(xs_addr(xprt), port);
1685 xs_update_peer_port(xprt);
1686 }
1687
1688 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1689 {
1690 unsigned short port = transport->srcport;
1691
1692 if (port == 0 && transport->xprt.resvport)
1693 port = xs_get_random_port();
1694 return port;
1695 }
1696
1697 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1698 {
1699 if (transport->srcport != 0)
1700 transport->srcport = 0;
1701 if (!transport->xprt.resvport)
1702 return 0;
1703 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1704 return xprt_max_resvport;
1705 return --port;
1706 }
1707 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1708 {
1709 struct sockaddr_storage myaddr;
1710 int err, nloop = 0;
1711 unsigned short port = xs_get_srcport(transport);
1712 unsigned short last;
1713
1714 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1715 do {
1716 rpc_set_port((struct sockaddr *)&myaddr, port);
1717 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1718 transport->xprt.addrlen);
1719 if (port == 0)
1720 break;
1721 if (err == 0) {
1722 transport->srcport = port;
1723 break;
1724 }
1725 last = port;
1726 port = xs_next_srcport(transport, port);
1727 if (port > last)
1728 nloop++;
1729 } while (err == -EADDRINUSE && nloop != 2);
1730
1731 if (myaddr.ss_family == AF_INET)
1732 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1733 &((struct sockaddr_in *)&myaddr)->sin_addr,
1734 port, err ? "failed" : "ok", err);
1735 else
1736 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1737 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1738 port, err ? "failed" : "ok", err);
1739 return err;
1740 }
1741
1742 /*
1743 * We don't support autobind on AF_LOCAL sockets
1744 */
1745 static void xs_local_rpcbind(struct rpc_task *task)
1746 {
1747 xprt_set_bound(task->tk_xprt);
1748 }
1749
1750 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1751 {
1752 }
1753
1754 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1755 static struct lock_class_key xs_key[2];
1756 static struct lock_class_key xs_slock_key[2];
1757
1758 static inline void xs_reclassify_socketu(struct socket *sock)
1759 {
1760 struct sock *sk = sock->sk;
1761
1762 BUG_ON(sock_owned_by_user(sk));
1763 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1764 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1765 }
1766
1767 static inline void xs_reclassify_socket4(struct socket *sock)
1768 {
1769 struct sock *sk = sock->sk;
1770
1771 BUG_ON(sock_owned_by_user(sk));
1772 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1773 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1774 }
1775
1776 static inline void xs_reclassify_socket6(struct socket *sock)
1777 {
1778 struct sock *sk = sock->sk;
1779
1780 BUG_ON(sock_owned_by_user(sk));
1781 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1782 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1783 }
1784
1785 static inline void xs_reclassify_socket(int family, struct socket *sock)
1786 {
1787 switch (family) {
1788 case AF_LOCAL:
1789 xs_reclassify_socketu(sock);
1790 break;
1791 case AF_INET:
1792 xs_reclassify_socket4(sock);
1793 break;
1794 case AF_INET6:
1795 xs_reclassify_socket6(sock);
1796 break;
1797 }
1798 }
1799 #else
1800 static inline void xs_reclassify_socketu(struct socket *sock)
1801 {
1802 }
1803
1804 static inline void xs_reclassify_socket4(struct socket *sock)
1805 {
1806 }
1807
1808 static inline void xs_reclassify_socket6(struct socket *sock)
1809 {
1810 }
1811
1812 static inline void xs_reclassify_socket(int family, struct socket *sock)
1813 {
1814 }
1815 #endif
1816
1817 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1818 struct sock_xprt *transport, int family, int type, int protocol)
1819 {
1820 struct socket *sock;
1821 int err;
1822
1823 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1824 if (err < 0) {
1825 dprintk("RPC: can't create %d transport socket (%d).\n",
1826 protocol, -err);
1827 goto out;
1828 }
1829 xs_reclassify_socket(family, sock);
1830
1831 err = xs_bind(transport, sock);
1832 if (err) {
1833 sock_release(sock);
1834 goto out;
1835 }
1836
1837 return sock;
1838 out:
1839 return ERR_PTR(err);
1840 }
1841
1842 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1843 struct socket *sock)
1844 {
1845 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1846 xprt);
1847
1848 if (!transport->inet) {
1849 struct sock *sk = sock->sk;
1850
1851 write_lock_bh(&sk->sk_callback_lock);
1852
1853 xs_save_old_callbacks(transport, sk);
1854
1855 sk->sk_user_data = xprt;
1856 sk->sk_data_ready = xs_local_data_ready;
1857 sk->sk_write_space = xs_udp_write_space;
1858 sk->sk_error_report = xs_error_report;
1859 sk->sk_allocation = GFP_ATOMIC;
1860
1861 xprt_clear_connected(xprt);
1862
1863 /* Reset to new socket */
1864 transport->sock = sock;
1865 transport->inet = sk;
1866
1867 write_unlock_bh(&sk->sk_callback_lock);
1868 }
1869
1870 /* Tell the socket layer to start connecting... */
1871 xprt->stat.connect_count++;
1872 xprt->stat.connect_start = jiffies;
1873 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1874 }
1875
1876 /**
1877 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1878 * @xprt: RPC transport to connect
1879 * @transport: socket transport to connect
1880 * @create_sock: function to create a socket of the correct type
1881 *
1882 * Invoked by a work queue tasklet.
1883 */
1884 static void xs_local_setup_socket(struct work_struct *work)
1885 {
1886 struct sock_xprt *transport =
1887 container_of(work, struct sock_xprt, connect_worker.work);
1888 struct rpc_xprt *xprt = &transport->xprt;
1889 struct socket *sock;
1890 int status = -EIO;
1891
1892 if (xprt->shutdown)
1893 goto out;
1894
1895 current->flags |= PF_FSTRANS;
1896
1897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1898 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1899 SOCK_STREAM, 0, &sock, 1);
1900 if (status < 0) {
1901 dprintk("RPC: can't create AF_LOCAL "
1902 "transport socket (%d).\n", -status);
1903 goto out;
1904 }
1905 xs_reclassify_socketu(sock);
1906
1907 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1908 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1909
1910 status = xs_local_finish_connecting(xprt, sock);
1911 switch (status) {
1912 case 0:
1913 dprintk("RPC: xprt %p connected to %s\n",
1914 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1915 xprt_set_connected(xprt);
1916 break;
1917 case -ENOENT:
1918 dprintk("RPC: xprt %p: socket %s does not exist\n",
1919 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1920 break;
1921 default:
1922 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1923 __func__, -status,
1924 xprt->address_strings[RPC_DISPLAY_ADDR]);
1925 }
1926
1927 out:
1928 xprt_clear_connecting(xprt);
1929 xprt_wake_pending_tasks(xprt, status);
1930 current->flags &= ~PF_FSTRANS;
1931 }
1932
1933 #ifdef CONFIG_SUNRPC_SWAP
1934 static void xs_set_memalloc(struct rpc_xprt *xprt)
1935 {
1936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1937 xprt);
1938
1939 if (xprt->swapper)
1940 sk_set_memalloc(transport->inet);
1941 }
1942
1943 /**
1944 * xs_swapper - Tag this transport as being used for swap.
1945 * @xprt: transport to tag
1946 * @enable: enable/disable
1947 *
1948 */
1949 int xs_swapper(struct rpc_xprt *xprt, int enable)
1950 {
1951 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1952 xprt);
1953 int err = 0;
1954
1955 if (enable) {
1956 xprt->swapper++;
1957 xs_set_memalloc(xprt);
1958 } else if (xprt->swapper) {
1959 xprt->swapper--;
1960 sk_clear_memalloc(transport->inet);
1961 }
1962
1963 return err;
1964 }
1965 EXPORT_SYMBOL_GPL(xs_swapper);
1966 #else
1967 static void xs_set_memalloc(struct rpc_xprt *xprt)
1968 {
1969 }
1970 #endif
1971
1972 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1973 {
1974 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1975
1976 if (!transport->inet) {
1977 struct sock *sk = sock->sk;
1978
1979 write_lock_bh(&sk->sk_callback_lock);
1980
1981 xs_save_old_callbacks(transport, sk);
1982
1983 sk->sk_user_data = xprt;
1984 sk->sk_data_ready = xs_udp_data_ready;
1985 sk->sk_write_space = xs_udp_write_space;
1986 sk->sk_error_report = xs_error_report;
1987 sk->sk_no_check = UDP_CSUM_NORCV;
1988 sk->sk_allocation = GFP_ATOMIC;
1989
1990 xprt_set_connected(xprt);
1991
1992 /* Reset to new socket */
1993 transport->sock = sock;
1994 transport->inet = sk;
1995
1996 xs_set_memalloc(xprt);
1997
1998 write_unlock_bh(&sk->sk_callback_lock);
1999 }
2000 xs_udp_do_set_buffer_size(xprt);
2001 }
2002
2003 static void xs_udp_setup_socket(struct work_struct *work)
2004 {
2005 struct sock_xprt *transport =
2006 container_of(work, struct sock_xprt, connect_worker.work);
2007 struct rpc_xprt *xprt = &transport->xprt;
2008 struct socket *sock = transport->sock;
2009 int status = -EIO;
2010
2011 if (xprt->shutdown)
2012 goto out;
2013
2014 current->flags |= PF_FSTRANS;
2015
2016 /* Start by resetting any existing state */
2017 xs_reset_transport(transport);
2018 sock = xs_create_sock(xprt, transport,
2019 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2020 if (IS_ERR(sock))
2021 goto out;
2022
2023 dprintk("RPC: worker connecting xprt %p via %s to "
2024 "%s (port %s)\n", xprt,
2025 xprt->address_strings[RPC_DISPLAY_PROTO],
2026 xprt->address_strings[RPC_DISPLAY_ADDR],
2027 xprt->address_strings[RPC_DISPLAY_PORT]);
2028
2029 xs_udp_finish_connecting(xprt, sock);
2030 status = 0;
2031 out:
2032 xprt_clear_connecting(xprt);
2033 xprt_wake_pending_tasks(xprt, status);
2034 current->flags &= ~PF_FSTRANS;
2035 }
2036
2037 /*
2038 * We need to preserve the port number so the reply cache on the server can
2039 * find our cached RPC replies when we get around to reconnecting.
2040 */
2041 static void xs_abort_connection(struct sock_xprt *transport)
2042 {
2043 int result;
2044 struct sockaddr any;
2045
2046 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2047
2048 /*
2049 * Disconnect the transport socket by doing a connect operation
2050 * with AF_UNSPEC. This should return immediately...
2051 */
2052 memset(&any, 0, sizeof(any));
2053 any.sa_family = AF_UNSPEC;
2054 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2055 if (!result)
2056 xs_sock_mark_closed(&transport->xprt);
2057 else
2058 dprintk("RPC: AF_UNSPEC connect return code %d\n",
2059 result);
2060 }
2061
2062 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2063 {
2064 unsigned int state = transport->inet->sk_state;
2065
2066 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2067 /* we don't need to abort the connection if the socket
2068 * hasn't undergone a shutdown
2069 */
2070 if (transport->inet->sk_shutdown == 0)
2071 return;
2072 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2073 __func__, transport->inet->sk_shutdown);
2074 }
2075 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2076 /* we don't need to abort the connection if the socket
2077 * hasn't undergone a shutdown
2078 */
2079 if (transport->inet->sk_shutdown == 0)
2080 return;
2081 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2082 "sk_shutdown set to %d\n",
2083 __func__, transport->inet->sk_shutdown);
2084 }
2085 xs_abort_connection(transport);
2086 }
2087
2088 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2089 {
2090 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2091 int ret = -ENOTCONN;
2092
2093 if (!transport->inet) {
2094 struct sock *sk = sock->sk;
2095
2096 write_lock_bh(&sk->sk_callback_lock);
2097
2098 xs_save_old_callbacks(transport, sk);
2099
2100 sk->sk_user_data = xprt;
2101 sk->sk_data_ready = xs_tcp_data_ready;
2102 sk->sk_state_change = xs_tcp_state_change;
2103 sk->sk_write_space = xs_tcp_write_space;
2104 sk->sk_error_report = xs_error_report;
2105 sk->sk_allocation = GFP_ATOMIC;
2106
2107 /* socket options */
2108 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2109 sock_reset_flag(sk, SOCK_LINGER);
2110 tcp_sk(sk)->linger2 = 0;
2111 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2112
2113 xprt_clear_connected(xprt);
2114
2115 /* Reset to new socket */
2116 transport->sock = sock;
2117 transport->inet = sk;
2118
2119 write_unlock_bh(&sk->sk_callback_lock);
2120 }
2121
2122 if (!xprt_bound(xprt))
2123 goto out;
2124
2125 xs_set_memalloc(xprt);
2126
2127 /* Tell the socket layer to start connecting... */
2128 xprt->stat.connect_count++;
2129 xprt->stat.connect_start = jiffies;
2130 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2131 switch (ret) {
2132 case 0:
2133 case -EINPROGRESS:
2134 /* SYN_SENT! */
2135 xprt->connect_cookie++;
2136 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2137 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2138 }
2139 out:
2140 return ret;
2141 }
2142
2143 /**
2144 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2145 * @xprt: RPC transport to connect
2146 * @transport: socket transport to connect
2147 * @create_sock: function to create a socket of the correct type
2148 *
2149 * Invoked by a work queue tasklet.
2150 */
2151 static void xs_tcp_setup_socket(struct work_struct *work)
2152 {
2153 struct sock_xprt *transport =
2154 container_of(work, struct sock_xprt, connect_worker.work);
2155 struct socket *sock = transport->sock;
2156 struct rpc_xprt *xprt = &transport->xprt;
2157 int status = -EIO;
2158
2159 if (xprt->shutdown)
2160 goto out;
2161
2162 current->flags |= PF_FSTRANS;
2163
2164 if (!sock) {
2165 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2166 sock = xs_create_sock(xprt, transport,
2167 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2168 if (IS_ERR(sock)) {
2169 status = PTR_ERR(sock);
2170 goto out;
2171 }
2172 } else {
2173 int abort_and_exit;
2174
2175 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2176 &xprt->state);
2177 /* "close" the socket, preserving the local port */
2178 xs_tcp_reuse_connection(transport);
2179
2180 if (abort_and_exit)
2181 goto out_eagain;
2182 }
2183
2184 dprintk("RPC: worker connecting xprt %p via %s to "
2185 "%s (port %s)\n", xprt,
2186 xprt->address_strings[RPC_DISPLAY_PROTO],
2187 xprt->address_strings[RPC_DISPLAY_ADDR],
2188 xprt->address_strings[RPC_DISPLAY_PORT]);
2189
2190 status = xs_tcp_finish_connecting(xprt, sock);
2191 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2192 xprt, -status, xprt_connected(xprt),
2193 sock->sk->sk_state);
2194 switch (status) {
2195 default:
2196 printk("%s: connect returned unhandled error %d\n",
2197 __func__, status);
2198 case -EADDRNOTAVAIL:
2199 /* We're probably in TIME_WAIT. Get rid of existing socket,
2200 * and retry
2201 */
2202 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
2203 xprt_force_disconnect(xprt);
2204 break;
2205 case -ECONNREFUSED:
2206 case -ECONNRESET:
2207 case -ENETUNREACH:
2208 /* retry with existing socket, after a delay */
2209 case 0:
2210 case -EINPROGRESS:
2211 case -EALREADY:
2212 xprt_clear_connecting(xprt);
2213 current->flags &= ~PF_FSTRANS;
2214 return;
2215 case -EINVAL:
2216 /* Happens, for instance, if the user specified a link
2217 * local IPv6 address without a scope-id.
2218 */
2219 goto out;
2220 }
2221 out_eagain:
2222 status = -EAGAIN;
2223 out:
2224 xprt_clear_connecting(xprt);
2225 xprt_wake_pending_tasks(xprt, status);
2226 current->flags &= ~PF_FSTRANS;
2227 }
2228
2229 /**
2230 * xs_connect - connect a socket to a remote endpoint
2231 * @task: address of RPC task that manages state of connect request
2232 *
2233 * TCP: If the remote end dropped the connection, delay reconnecting.
2234 *
2235 * UDP socket connects are synchronous, but we use a work queue anyway
2236 * to guarantee that even unprivileged user processes can set up a
2237 * socket on a privileged port.
2238 *
2239 * If a UDP socket connect fails, the delay behavior here prevents
2240 * retry floods (hard mounts).
2241 */
2242 static void xs_connect(struct rpc_task *task)
2243 {
2244 struct rpc_xprt *xprt = task->tk_xprt;
2245 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2246
2247 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2248 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2249 "seconds\n",
2250 xprt, xprt->reestablish_timeout / HZ);
2251 queue_delayed_work(rpciod_workqueue,
2252 &transport->connect_worker,
2253 xprt->reestablish_timeout);
2254 xprt->reestablish_timeout <<= 1;
2255 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2256 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2257 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2258 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2259 } else {
2260 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2261 queue_delayed_work(rpciod_workqueue,
2262 &transport->connect_worker, 0);
2263 }
2264 }
2265
2266 /**
2267 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2268 * @xprt: rpc_xprt struct containing statistics
2269 * @seq: output file
2270 *
2271 */
2272 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2273 {
2274 long idle_time = 0;
2275
2276 if (xprt_connected(xprt))
2277 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2278
2279 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2280 "%llu %llu %lu %llu %llu\n",
2281 xprt->stat.bind_count,
2282 xprt->stat.connect_count,
2283 xprt->stat.connect_time,
2284 idle_time,
2285 xprt->stat.sends,
2286 xprt->stat.recvs,
2287 xprt->stat.bad_xids,
2288 xprt->stat.req_u,
2289 xprt->stat.bklog_u,
2290 xprt->stat.max_slots,
2291 xprt->stat.sending_u,
2292 xprt->stat.pending_u);
2293 }
2294
2295 /**
2296 * xs_udp_print_stats - display UDP socket-specifc stats
2297 * @xprt: rpc_xprt struct containing statistics
2298 * @seq: output file
2299 *
2300 */
2301 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2302 {
2303 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2304
2305 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2306 "%lu %llu %llu\n",
2307 transport->srcport,
2308 xprt->stat.bind_count,
2309 xprt->stat.sends,
2310 xprt->stat.recvs,
2311 xprt->stat.bad_xids,
2312 xprt->stat.req_u,
2313 xprt->stat.bklog_u,
2314 xprt->stat.max_slots,
2315 xprt->stat.sending_u,
2316 xprt->stat.pending_u);
2317 }
2318
2319 /**
2320 * xs_tcp_print_stats - display TCP socket-specifc stats
2321 * @xprt: rpc_xprt struct containing statistics
2322 * @seq: output file
2323 *
2324 */
2325 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2326 {
2327 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2328 long idle_time = 0;
2329
2330 if (xprt_connected(xprt))
2331 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2332
2333 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2334 "%llu %llu %lu %llu %llu\n",
2335 transport->srcport,
2336 xprt->stat.bind_count,
2337 xprt->stat.connect_count,
2338 xprt->stat.connect_time,
2339 idle_time,
2340 xprt->stat.sends,
2341 xprt->stat.recvs,
2342 xprt->stat.bad_xids,
2343 xprt->stat.req_u,
2344 xprt->stat.bklog_u,
2345 xprt->stat.max_slots,
2346 xprt->stat.sending_u,
2347 xprt->stat.pending_u);
2348 }
2349
2350 /*
2351 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2352 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2353 * to use the server side send routines.
2354 */
2355 static void *bc_malloc(struct rpc_task *task, size_t size)
2356 {
2357 struct page *page;
2358 struct rpc_buffer *buf;
2359
2360 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2361 page = alloc_page(GFP_KERNEL);
2362
2363 if (!page)
2364 return NULL;
2365
2366 buf = page_address(page);
2367 buf->len = PAGE_SIZE;
2368
2369 return buf->data;
2370 }
2371
2372 /*
2373 * Free the space allocated in the bc_alloc routine
2374 */
2375 static void bc_free(void *buffer)
2376 {
2377 struct rpc_buffer *buf;
2378
2379 if (!buffer)
2380 return;
2381
2382 buf = container_of(buffer, struct rpc_buffer, data);
2383 free_page((unsigned long)buf);
2384 }
2385
2386 /*
2387 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2388 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2389 */
2390 static int bc_sendto(struct rpc_rqst *req)
2391 {
2392 int len;
2393 struct xdr_buf *xbufp = &req->rq_snd_buf;
2394 struct rpc_xprt *xprt = req->rq_xprt;
2395 struct sock_xprt *transport =
2396 container_of(xprt, struct sock_xprt, xprt);
2397 struct socket *sock = transport->sock;
2398 unsigned long headoff;
2399 unsigned long tailoff;
2400
2401 xs_encode_stream_record_marker(xbufp);
2402
2403 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2404 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2405 len = svc_send_common(sock, xbufp,
2406 virt_to_page(xbufp->head[0].iov_base), headoff,
2407 xbufp->tail[0].iov_base, tailoff);
2408
2409 if (len != xbufp->len) {
2410 printk(KERN_NOTICE "Error sending entire callback!\n");
2411 len = -EAGAIN;
2412 }
2413
2414 return len;
2415 }
2416
2417 /*
2418 * The send routine. Borrows from svc_send
2419 */
2420 static int bc_send_request(struct rpc_task *task)
2421 {
2422 struct rpc_rqst *req = task->tk_rqstp;
2423 struct svc_xprt *xprt;
2424 struct svc_sock *svsk;
2425 u32 len;
2426
2427 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2428 /*
2429 * Get the server socket associated with this callback xprt
2430 */
2431 xprt = req->rq_xprt->bc_xprt;
2432 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2433
2434 /*
2435 * Grab the mutex to serialize data as the connection is shared
2436 * with the fore channel
2437 */
2438 if (!mutex_trylock(&xprt->xpt_mutex)) {
2439 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2440 if (!mutex_trylock(&xprt->xpt_mutex))
2441 return -EAGAIN;
2442 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2443 }
2444 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2445 len = -ENOTCONN;
2446 else
2447 len = bc_sendto(req);
2448 mutex_unlock(&xprt->xpt_mutex);
2449
2450 if (len > 0)
2451 len = 0;
2452
2453 return len;
2454 }
2455
2456 /*
2457 * The close routine. Since this is client initiated, we do nothing
2458 */
2459
2460 static void bc_close(struct rpc_xprt *xprt)
2461 {
2462 }
2463
2464 /*
2465 * The xprt destroy routine. Again, because this connection is client
2466 * initiated, we do nothing
2467 */
2468
2469 static void bc_destroy(struct rpc_xprt *xprt)
2470 {
2471 }
2472
2473 static struct rpc_xprt_ops xs_local_ops = {
2474 .reserve_xprt = xprt_reserve_xprt,
2475 .release_xprt = xs_tcp_release_xprt,
2476 .alloc_slot = xprt_alloc_slot,
2477 .rpcbind = xs_local_rpcbind,
2478 .set_port = xs_local_set_port,
2479 .connect = xs_connect,
2480 .buf_alloc = rpc_malloc,
2481 .buf_free = rpc_free,
2482 .send_request = xs_local_send_request,
2483 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2484 .close = xs_close,
2485 .destroy = xs_destroy,
2486 .print_stats = xs_local_print_stats,
2487 };
2488
2489 static struct rpc_xprt_ops xs_udp_ops = {
2490 .set_buffer_size = xs_udp_set_buffer_size,
2491 .reserve_xprt = xprt_reserve_xprt_cong,
2492 .release_xprt = xprt_release_xprt_cong,
2493 .alloc_slot = xprt_alloc_slot,
2494 .rpcbind = rpcb_getport_async,
2495 .set_port = xs_set_port,
2496 .connect = xs_connect,
2497 .buf_alloc = rpc_malloc,
2498 .buf_free = rpc_free,
2499 .send_request = xs_udp_send_request,
2500 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2501 .timer = xs_udp_timer,
2502 .release_request = xprt_release_rqst_cong,
2503 .close = xs_close,
2504 .destroy = xs_destroy,
2505 .print_stats = xs_udp_print_stats,
2506 };
2507
2508 static struct rpc_xprt_ops xs_tcp_ops = {
2509 .reserve_xprt = xprt_reserve_xprt,
2510 .release_xprt = xs_tcp_release_xprt,
2511 .alloc_slot = xprt_lock_and_alloc_slot,
2512 .rpcbind = rpcb_getport_async,
2513 .set_port = xs_set_port,
2514 .connect = xs_connect,
2515 .buf_alloc = rpc_malloc,
2516 .buf_free = rpc_free,
2517 .send_request = xs_tcp_send_request,
2518 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2519 .close = xs_tcp_close,
2520 .destroy = xs_destroy,
2521 .print_stats = xs_tcp_print_stats,
2522 };
2523
2524 /*
2525 * The rpc_xprt_ops for the server backchannel
2526 */
2527
2528 static struct rpc_xprt_ops bc_tcp_ops = {
2529 .reserve_xprt = xprt_reserve_xprt,
2530 .release_xprt = xprt_release_xprt,
2531 .rpcbind = xs_local_rpcbind,
2532 .buf_alloc = bc_malloc,
2533 .buf_free = bc_free,
2534 .send_request = bc_send_request,
2535 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2536 .close = bc_close,
2537 .destroy = bc_destroy,
2538 .print_stats = xs_tcp_print_stats,
2539 };
2540
2541 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2542 {
2543 static const struct sockaddr_in sin = {
2544 .sin_family = AF_INET,
2545 .sin_addr.s_addr = htonl(INADDR_ANY),
2546 };
2547 static const struct sockaddr_in6 sin6 = {
2548 .sin6_family = AF_INET6,
2549 .sin6_addr = IN6ADDR_ANY_INIT,
2550 };
2551
2552 switch (family) {
2553 case AF_LOCAL:
2554 break;
2555 case AF_INET:
2556 memcpy(sap, &sin, sizeof(sin));
2557 break;
2558 case AF_INET6:
2559 memcpy(sap, &sin6, sizeof(sin6));
2560 break;
2561 default:
2562 dprintk("RPC: %s: Bad address family\n", __func__);
2563 return -EAFNOSUPPORT;
2564 }
2565 return 0;
2566 }
2567
2568 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2569 unsigned int slot_table_size,
2570 unsigned int max_slot_table_size)
2571 {
2572 struct rpc_xprt *xprt;
2573 struct sock_xprt *new;
2574
2575 if (args->addrlen > sizeof(xprt->addr)) {
2576 dprintk("RPC: xs_setup_xprt: address too large\n");
2577 return ERR_PTR(-EBADF);
2578 }
2579
2580 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2581 max_slot_table_size);
2582 if (xprt == NULL) {
2583 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2584 "rpc_xprt\n");
2585 return ERR_PTR(-ENOMEM);
2586 }
2587
2588 new = container_of(xprt, struct sock_xprt, xprt);
2589 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2590 xprt->addrlen = args->addrlen;
2591 if (args->srcaddr)
2592 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2593 else {
2594 int err;
2595 err = xs_init_anyaddr(args->dstaddr->sa_family,
2596 (struct sockaddr *)&new->srcaddr);
2597 if (err != 0) {
2598 xprt_free(xprt);
2599 return ERR_PTR(err);
2600 }
2601 }
2602
2603 return xprt;
2604 }
2605
2606 static const struct rpc_timeout xs_local_default_timeout = {
2607 .to_initval = 10 * HZ,
2608 .to_maxval = 10 * HZ,
2609 .to_retries = 2,
2610 };
2611
2612 /**
2613 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2614 * @args: rpc transport creation arguments
2615 *
2616 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2617 */
2618 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2619 {
2620 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2621 struct sock_xprt *transport;
2622 struct rpc_xprt *xprt;
2623 struct rpc_xprt *ret;
2624
2625 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2626 xprt_max_tcp_slot_table_entries);
2627 if (IS_ERR(xprt))
2628 return xprt;
2629 transport = container_of(xprt, struct sock_xprt, xprt);
2630
2631 xprt->prot = 0;
2632 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2633 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2634
2635 xprt->bind_timeout = XS_BIND_TO;
2636 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2637 xprt->idle_timeout = XS_IDLE_DISC_TO;
2638
2639 xprt->ops = &xs_local_ops;
2640 xprt->timeout = &xs_local_default_timeout;
2641
2642 switch (sun->sun_family) {
2643 case AF_LOCAL:
2644 if (sun->sun_path[0] != '/') {
2645 dprintk("RPC: bad AF_LOCAL address: %s\n",
2646 sun->sun_path);
2647 ret = ERR_PTR(-EINVAL);
2648 goto out_err;
2649 }
2650 xprt_set_bound(xprt);
2651 INIT_DELAYED_WORK(&transport->connect_worker,
2652 xs_local_setup_socket);
2653 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2654 break;
2655 default:
2656 ret = ERR_PTR(-EAFNOSUPPORT);
2657 goto out_err;
2658 }
2659
2660 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2661 xprt->address_strings[RPC_DISPLAY_ADDR]);
2662
2663 if (try_module_get(THIS_MODULE))
2664 return xprt;
2665 ret = ERR_PTR(-EINVAL);
2666 out_err:
2667 xprt_free(xprt);
2668 return ret;
2669 }
2670
2671 static const struct rpc_timeout xs_udp_default_timeout = {
2672 .to_initval = 5 * HZ,
2673 .to_maxval = 30 * HZ,
2674 .to_increment = 5 * HZ,
2675 .to_retries = 5,
2676 };
2677
2678 /**
2679 * xs_setup_udp - Set up transport to use a UDP socket
2680 * @args: rpc transport creation arguments
2681 *
2682 */
2683 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2684 {
2685 struct sockaddr *addr = args->dstaddr;
2686 struct rpc_xprt *xprt;
2687 struct sock_xprt *transport;
2688 struct rpc_xprt *ret;
2689
2690 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2691 xprt_udp_slot_table_entries);
2692 if (IS_ERR(xprt))
2693 return xprt;
2694 transport = container_of(xprt, struct sock_xprt, xprt);
2695
2696 xprt->prot = IPPROTO_UDP;
2697 xprt->tsh_size = 0;
2698 /* XXX: header size can vary due to auth type, IPv6, etc. */
2699 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2700
2701 xprt->bind_timeout = XS_BIND_TO;
2702 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2703 xprt->idle_timeout = XS_IDLE_DISC_TO;
2704
2705 xprt->ops = &xs_udp_ops;
2706
2707 xprt->timeout = &xs_udp_default_timeout;
2708
2709 switch (addr->sa_family) {
2710 case AF_INET:
2711 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2712 xprt_set_bound(xprt);
2713
2714 INIT_DELAYED_WORK(&transport->connect_worker,
2715 xs_udp_setup_socket);
2716 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2717 break;
2718 case AF_INET6:
2719 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2720 xprt_set_bound(xprt);
2721
2722 INIT_DELAYED_WORK(&transport->connect_worker,
2723 xs_udp_setup_socket);
2724 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2725 break;
2726 default:
2727 ret = ERR_PTR(-EAFNOSUPPORT);
2728 goto out_err;
2729 }
2730
2731 if (xprt_bound(xprt))
2732 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2733 xprt->address_strings[RPC_DISPLAY_ADDR],
2734 xprt->address_strings[RPC_DISPLAY_PORT],
2735 xprt->address_strings[RPC_DISPLAY_PROTO]);
2736 else
2737 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2738 xprt->address_strings[RPC_DISPLAY_ADDR],
2739 xprt->address_strings[RPC_DISPLAY_PROTO]);
2740
2741 if (try_module_get(THIS_MODULE))
2742 return xprt;
2743 ret = ERR_PTR(-EINVAL);
2744 out_err:
2745 xprt_free(xprt);
2746 return ret;
2747 }
2748
2749 static const struct rpc_timeout xs_tcp_default_timeout = {
2750 .to_initval = 60 * HZ,
2751 .to_maxval = 60 * HZ,
2752 .to_retries = 2,
2753 };
2754
2755 /**
2756 * xs_setup_tcp - Set up transport to use a TCP socket
2757 * @args: rpc transport creation arguments
2758 *
2759 */
2760 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2761 {
2762 struct sockaddr *addr = args->dstaddr;
2763 struct rpc_xprt *xprt;
2764 struct sock_xprt *transport;
2765 struct rpc_xprt *ret;
2766
2767 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2768 xprt_max_tcp_slot_table_entries);
2769 if (IS_ERR(xprt))
2770 return xprt;
2771 transport = container_of(xprt, struct sock_xprt, xprt);
2772
2773 xprt->prot = IPPROTO_TCP;
2774 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2775 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2776
2777 xprt->bind_timeout = XS_BIND_TO;
2778 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2779 xprt->idle_timeout = XS_IDLE_DISC_TO;
2780
2781 xprt->ops = &xs_tcp_ops;
2782 xprt->timeout = &xs_tcp_default_timeout;
2783
2784 switch (addr->sa_family) {
2785 case AF_INET:
2786 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2787 xprt_set_bound(xprt);
2788
2789 INIT_DELAYED_WORK(&transport->connect_worker,
2790 xs_tcp_setup_socket);
2791 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2792 break;
2793 case AF_INET6:
2794 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2795 xprt_set_bound(xprt);
2796
2797 INIT_DELAYED_WORK(&transport->connect_worker,
2798 xs_tcp_setup_socket);
2799 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2800 break;
2801 default:
2802 ret = ERR_PTR(-EAFNOSUPPORT);
2803 goto out_err;
2804 }
2805
2806 if (xprt_bound(xprt))
2807 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2808 xprt->address_strings[RPC_DISPLAY_ADDR],
2809 xprt->address_strings[RPC_DISPLAY_PORT],
2810 xprt->address_strings[RPC_DISPLAY_PROTO]);
2811 else
2812 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2813 xprt->address_strings[RPC_DISPLAY_ADDR],
2814 xprt->address_strings[RPC_DISPLAY_PROTO]);
2815
2816
2817 if (try_module_get(THIS_MODULE))
2818 return xprt;
2819 ret = ERR_PTR(-EINVAL);
2820 out_err:
2821 xprt_free(xprt);
2822 return ret;
2823 }
2824
2825 /**
2826 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2827 * @args: rpc transport creation arguments
2828 *
2829 */
2830 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2831 {
2832 struct sockaddr *addr = args->dstaddr;
2833 struct rpc_xprt *xprt;
2834 struct sock_xprt *transport;
2835 struct svc_sock *bc_sock;
2836 struct rpc_xprt *ret;
2837
2838 if (args->bc_xprt->xpt_bc_xprt) {
2839 /*
2840 * This server connection already has a backchannel
2841 * export; we can't create a new one, as we wouldn't be
2842 * able to match replies based on xid any more. So,
2843 * reuse the already-existing one:
2844 */
2845 return args->bc_xprt->xpt_bc_xprt;
2846 }
2847 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2848 xprt_tcp_slot_table_entries);
2849 if (IS_ERR(xprt))
2850 return xprt;
2851 transport = container_of(xprt, struct sock_xprt, xprt);
2852
2853 xprt->prot = IPPROTO_TCP;
2854 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2855 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2856 xprt->timeout = &xs_tcp_default_timeout;
2857
2858 /* backchannel */
2859 xprt_set_bound(xprt);
2860 xprt->bind_timeout = 0;
2861 xprt->reestablish_timeout = 0;
2862 xprt->idle_timeout = 0;
2863
2864 xprt->ops = &bc_tcp_ops;
2865
2866 switch (addr->sa_family) {
2867 case AF_INET:
2868 xs_format_peer_addresses(xprt, "tcp",
2869 RPCBIND_NETID_TCP);
2870 break;
2871 case AF_INET6:
2872 xs_format_peer_addresses(xprt, "tcp",
2873 RPCBIND_NETID_TCP6);
2874 break;
2875 default:
2876 ret = ERR_PTR(-EAFNOSUPPORT);
2877 goto out_err;
2878 }
2879
2880 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2881 xprt->address_strings[RPC_DISPLAY_ADDR],
2882 xprt->address_strings[RPC_DISPLAY_PORT],
2883 xprt->address_strings[RPC_DISPLAY_PROTO]);
2884
2885 /*
2886 * Once we've associated a backchannel xprt with a connection,
2887 * we want to keep it around as long as long as the connection
2888 * lasts, in case we need to start using it for a backchannel
2889 * again; this reference won't be dropped until bc_xprt is
2890 * destroyed.
2891 */
2892 xprt_get(xprt);
2893 args->bc_xprt->xpt_bc_xprt = xprt;
2894 xprt->bc_xprt = args->bc_xprt;
2895 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2896 transport->sock = bc_sock->sk_sock;
2897 transport->inet = bc_sock->sk_sk;
2898
2899 /*
2900 * Since we don't want connections for the backchannel, we set
2901 * the xprt status to connected
2902 */
2903 xprt_set_connected(xprt);
2904
2905
2906 if (try_module_get(THIS_MODULE))
2907 return xprt;
2908 xprt_put(xprt);
2909 ret = ERR_PTR(-EINVAL);
2910 out_err:
2911 xprt_free(xprt);
2912 return ret;
2913 }
2914
2915 static struct xprt_class xs_local_transport = {
2916 .list = LIST_HEAD_INIT(xs_local_transport.list),
2917 .name = "named UNIX socket",
2918 .owner = THIS_MODULE,
2919 .ident = XPRT_TRANSPORT_LOCAL,
2920 .setup = xs_setup_local,
2921 };
2922
2923 static struct xprt_class xs_udp_transport = {
2924 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2925 .name = "udp",
2926 .owner = THIS_MODULE,
2927 .ident = XPRT_TRANSPORT_UDP,
2928 .setup = xs_setup_udp,
2929 };
2930
2931 static struct xprt_class xs_tcp_transport = {
2932 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2933 .name = "tcp",
2934 .owner = THIS_MODULE,
2935 .ident = XPRT_TRANSPORT_TCP,
2936 .setup = xs_setup_tcp,
2937 };
2938
2939 static struct xprt_class xs_bc_tcp_transport = {
2940 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2941 .name = "tcp NFSv4.1 backchannel",
2942 .owner = THIS_MODULE,
2943 .ident = XPRT_TRANSPORT_BC_TCP,
2944 .setup = xs_setup_bc_tcp,
2945 };
2946
2947 /**
2948 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2949 *
2950 */
2951 int init_socket_xprt(void)
2952 {
2953 #ifdef RPC_DEBUG
2954 if (!sunrpc_table_header)
2955 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2956 #endif
2957
2958 xprt_register_transport(&xs_local_transport);
2959 xprt_register_transport(&xs_udp_transport);
2960 xprt_register_transport(&xs_tcp_transport);
2961 xprt_register_transport(&xs_bc_tcp_transport);
2962
2963 return 0;
2964 }
2965
2966 /**
2967 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2968 *
2969 */
2970 void cleanup_socket_xprt(void)
2971 {
2972 #ifdef RPC_DEBUG
2973 if (sunrpc_table_header) {
2974 unregister_sysctl_table(sunrpc_table_header);
2975 sunrpc_table_header = NULL;
2976 }
2977 #endif
2978
2979 xprt_unregister_transport(&xs_local_transport);
2980 xprt_unregister_transport(&xs_udp_transport);
2981 xprt_unregister_transport(&xs_tcp_transport);
2982 xprt_unregister_transport(&xs_bc_tcp_transport);
2983 }
2984
2985 static int param_set_uint_minmax(const char *val,
2986 const struct kernel_param *kp,
2987 unsigned int min, unsigned int max)
2988 {
2989 unsigned long num;
2990 int ret;
2991
2992 if (!val)
2993 return -EINVAL;
2994 ret = strict_strtoul(val, 0, &num);
2995 if (ret == -EINVAL || num < min || num > max)
2996 return -EINVAL;
2997 *((unsigned int *)kp->arg) = num;
2998 return 0;
2999 }
3000
3001 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3002 {
3003 return param_set_uint_minmax(val, kp,
3004 RPC_MIN_RESVPORT,
3005 RPC_MAX_RESVPORT);
3006 }
3007
3008 static struct kernel_param_ops param_ops_portnr = {
3009 .set = param_set_portnr,
3010 .get = param_get_uint,
3011 };
3012
3013 #define param_check_portnr(name, p) \
3014 __param_check(name, p, unsigned int);
3015
3016 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3017 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3018
3019 static int param_set_slot_table_size(const char *val,
3020 const struct kernel_param *kp)
3021 {
3022 return param_set_uint_minmax(val, kp,
3023 RPC_MIN_SLOT_TABLE,
3024 RPC_MAX_SLOT_TABLE);
3025 }
3026
3027 static struct kernel_param_ops param_ops_slot_table_size = {
3028 .set = param_set_slot_table_size,
3029 .get = param_get_uint,
3030 };
3031
3032 #define param_check_slot_table_size(name, p) \
3033 __param_check(name, p, unsigned int);
3034
3035 static int param_set_max_slot_table_size(const char *val,
3036 const struct kernel_param *kp)
3037 {
3038 return param_set_uint_minmax(val, kp,
3039 RPC_MIN_SLOT_TABLE,
3040 RPC_MAX_SLOT_TABLE_LIMIT);
3041 }
3042
3043 static struct kernel_param_ops param_ops_max_slot_table_size = {
3044 .set = param_set_max_slot_table_size,
3045 .get = param_get_uint,
3046 };
3047
3048 #define param_check_max_slot_table_size(name, p) \
3049 __param_check(name, p, unsigned int);
3050
3051 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3052 slot_table_size, 0644);
3053 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3054 max_slot_table_size, 0644);
3055 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3056 slot_table_size, 0644);
3057
Linus' kernel tree