blob: 287b1415cee93fae57a830fdd74ef9144b00c7d7 [file] [log] [blame]
David Howells17926a72007-04-26 15:48:28 -07001/* AF_RXRPC implementation
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/net.h>
14#include <linux/skbuff.h>
15#include <linux/poll.h>
16#include <linux/proc_fs.h>
David Howells76181c12007-10-16 23:29:46 -070017#include <linux/key-type.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020018#include <net/net_namespace.h>
David Howells17926a72007-04-26 15:48:28 -070019#include <net/sock.h>
20#include <net/af_rxrpc.h>
21#include "ar-internal.h"
22
23MODULE_DESCRIPTION("RxRPC network protocol");
24MODULE_AUTHOR("Red Hat, Inc.");
25MODULE_LICENSE("GPL");
26MODULE_ALIAS_NETPROTO(PF_RXRPC);
27
28unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
29module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
Paul Bolle424b00e2008-04-16 11:08:22 +010030MODULE_PARM_DESC(debug, "RxRPC debugging mask");
David Howells17926a72007-04-26 15:48:28 -070031
32static int sysctl_rxrpc_max_qlen __read_mostly = 10;
33
34static struct proto rxrpc_proto;
35static const struct proto_ops rxrpc_rpc_ops;
36
37/* local epoch for detecting local-end reset */
38__be32 rxrpc_epoch;
39
40/* current debugging ID */
41atomic_t rxrpc_debug_id;
42
43/* count of skbs currently in use */
44atomic_t rxrpc_n_skbs;
45
David Howells651350d2007-04-26 15:50:17 -070046struct workqueue_struct *rxrpc_workqueue;
47
David Howells17926a72007-04-26 15:48:28 -070048static void rxrpc_sock_destructor(struct sock *);
49
50/*
51 * see if an RxRPC socket is currently writable
52 */
53static inline int rxrpc_writable(struct sock *sk)
54{
55 return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
56}
57
58/*
59 * wait for write bufferage to become available
60 */
61static void rxrpc_write_space(struct sock *sk)
62{
63 _enter("%p", sk);
64 read_lock(&sk->sk_callback_lock);
65 if (rxrpc_writable(sk)) {
Jiri Olsaa57de0b2009-07-08 12:09:13 +000066 if (sk_has_sleeper(sk))
David Howells17926a72007-04-26 15:48:28 -070067 wake_up_interruptible(sk->sk_sleep);
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +080068 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
David Howells17926a72007-04-26 15:48:28 -070069 }
70 read_unlock(&sk->sk_callback_lock);
71}
72
73/*
74 * validate an RxRPC address
75 */
76static int rxrpc_validate_address(struct rxrpc_sock *rx,
77 struct sockaddr_rxrpc *srx,
78 int len)
79{
80 if (len < sizeof(struct sockaddr_rxrpc))
81 return -EINVAL;
82
83 if (srx->srx_family != AF_RXRPC)
84 return -EAFNOSUPPORT;
85
86 if (srx->transport_type != SOCK_DGRAM)
87 return -ESOCKTNOSUPPORT;
88
89 len -= offsetof(struct sockaddr_rxrpc, transport);
90 if (srx->transport_len < sizeof(sa_family_t) ||
91 srx->transport_len > len)
92 return -EINVAL;
93
94 if (srx->transport.family != rx->proto)
95 return -EAFNOSUPPORT;
96
97 switch (srx->transport.family) {
98 case AF_INET:
Harvey Harrison21454aa2008-10-31 00:54:56 -070099 _debug("INET: %x @ %pI4",
David Howells17926a72007-04-26 15:48:28 -0700100 ntohs(srx->transport.sin.sin_port),
Harvey Harrison21454aa2008-10-31 00:54:56 -0700101 &srx->transport.sin.sin_addr);
David Howells17926a72007-04-26 15:48:28 -0700102 if (srx->transport_len > 8)
103 memset((void *)&srx->transport + 8, 0,
104 srx->transport_len - 8);
105 break;
106
107 case AF_INET6:
108 default:
109 return -EAFNOSUPPORT;
110 }
111
112 return 0;
113}
114
115/*
116 * bind a local address to an RxRPC socket
117 */
118static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
119{
120 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
121 struct sock *sk = sock->sk;
122 struct rxrpc_local *local;
123 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
124 __be16 service_id;
125 int ret;
126
127 _enter("%p,%p,%d", rx, saddr, len);
128
129 ret = rxrpc_validate_address(rx, srx, len);
130 if (ret < 0)
131 goto error;
132
133 lock_sock(&rx->sk);
134
135 if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
136 ret = -EINVAL;
137 goto error_unlock;
138 }
139
140 memcpy(&rx->srx, srx, sizeof(rx->srx));
141
142 /* find a local transport endpoint if we don't have one already */
143 local = rxrpc_lookup_local(&rx->srx);
144 if (IS_ERR(local)) {
145 ret = PTR_ERR(local);
146 goto error_unlock;
147 }
148
149 rx->local = local;
150 if (srx->srx_service) {
151 service_id = htons(srx->srx_service);
152 write_lock_bh(&local->services_lock);
153 list_for_each_entry(prx, &local->services, listen_link) {
154 if (prx->service_id == service_id)
155 goto service_in_use;
156 }
157
158 rx->service_id = service_id;
159 list_add_tail(&rx->listen_link, &local->services);
160 write_unlock_bh(&local->services_lock);
161
162 rx->sk.sk_state = RXRPC_SERVER_BOUND;
163 } else {
164 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
165 }
166
167 release_sock(&rx->sk);
168 _leave(" = 0");
169 return 0;
170
171service_in_use:
172 ret = -EADDRINUSE;
173 write_unlock_bh(&local->services_lock);
174error_unlock:
175 release_sock(&rx->sk);
176error:
177 _leave(" = %d", ret);
178 return ret;
179}
180
181/*
182 * set the number of pending calls permitted on a listening socket
183 */
184static int rxrpc_listen(struct socket *sock, int backlog)
185{
186 struct sock *sk = sock->sk;
187 struct rxrpc_sock *rx = rxrpc_sk(sk);
188 int ret;
189
190 _enter("%p,%d", rx, backlog);
191
192 lock_sock(&rx->sk);
193
194 switch (rx->sk.sk_state) {
195 case RXRPC_UNCONNECTED:
196 ret = -EADDRNOTAVAIL;
197 break;
198 case RXRPC_CLIENT_BOUND:
199 case RXRPC_CLIENT_CONNECTED:
200 default:
201 ret = -EBUSY;
202 break;
203 case RXRPC_SERVER_BOUND:
204 ASSERT(rx->local != NULL);
205 sk->sk_max_ack_backlog = backlog;
206 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
207 ret = 0;
208 break;
209 }
210
211 release_sock(&rx->sk);
212 _leave(" = %d", ret);
213 return ret;
214}
215
216/*
217 * find a transport by address
218 */
219static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
220 struct sockaddr *addr,
David Howells651350d2007-04-26 15:50:17 -0700221 int addr_len, int flags,
222 gfp_t gfp)
David Howells17926a72007-04-26 15:48:28 -0700223{
224 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
225 struct rxrpc_transport *trans;
226 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
227 struct rxrpc_peer *peer;
228
229 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
230
231 ASSERT(rx->local != NULL);
232 ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
233
234 if (rx->srx.transport_type != srx->transport_type)
235 return ERR_PTR(-ESOCKTNOSUPPORT);
236 if (rx->srx.transport.family != srx->transport.family)
237 return ERR_PTR(-EAFNOSUPPORT);
238
239 /* find a remote transport endpoint from the local one */
David Howells651350d2007-04-26 15:50:17 -0700240 peer = rxrpc_get_peer(srx, gfp);
David Howells17926a72007-04-26 15:48:28 -0700241 if (IS_ERR(peer))
David Howellse231c2e2008-02-07 00:15:26 -0800242 return ERR_CAST(peer);
David Howells17926a72007-04-26 15:48:28 -0700243
244 /* find a transport */
David Howells651350d2007-04-26 15:50:17 -0700245 trans = rxrpc_get_transport(rx->local, peer, gfp);
David Howells17926a72007-04-26 15:48:28 -0700246 rxrpc_put_peer(peer);
247 _leave(" = %p", trans);
248 return trans;
249}
250
David Howells651350d2007-04-26 15:50:17 -0700251/**
252 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
253 * @sock: The socket on which to make the call
254 * @srx: The address of the peer to contact (defaults to socket setting)
255 * @key: The security context to use (defaults to socket setting)
256 * @user_call_ID: The ID to use
257 *
258 * Allow a kernel service to begin a call on the nominated socket. This just
259 * sets up all the internal tracking structures and allocates connection and
260 * call IDs as appropriate. The call to be used is returned.
261 *
262 * The default socket destination address and security may be overridden by
263 * supplying @srx and @key.
264 */
265struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
266 struct sockaddr_rxrpc *srx,
267 struct key *key,
268 unsigned long user_call_ID,
269 gfp_t gfp)
270{
271 struct rxrpc_conn_bundle *bundle;
272 struct rxrpc_transport *trans;
273 struct rxrpc_call *call;
274 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
275 __be16 service_id;
276
277 _enter(",,%x,%lx", key_serial(key), user_call_ID);
278
279 lock_sock(&rx->sk);
280
281 if (srx) {
282 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
283 sizeof(*srx), 0, gfp);
284 if (IS_ERR(trans)) {
David Howellse231c2e2008-02-07 00:15:26 -0800285 call = ERR_CAST(trans);
David Howells651350d2007-04-26 15:50:17 -0700286 trans = NULL;
David Howells15bde722009-02-06 21:50:52 -0800287 goto out_notrans;
David Howells651350d2007-04-26 15:50:17 -0700288 }
289 } else {
290 trans = rx->trans;
291 if (!trans) {
292 call = ERR_PTR(-ENOTCONN);
David Howells15bde722009-02-06 21:50:52 -0800293 goto out_notrans;
David Howells651350d2007-04-26 15:50:17 -0700294 }
295 atomic_inc(&trans->usage);
296 }
297
298 service_id = rx->service_id;
299 if (srx)
300 service_id = htons(srx->srx_service);
301
302 if (!key)
303 key = rx->key;
304 if (key && !key->payload.data)
305 key = NULL; /* a no-security key */
306
307 bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
308 if (IS_ERR(bundle)) {
David Howellse231c2e2008-02-07 00:15:26 -0800309 call = ERR_CAST(bundle);
David Howells651350d2007-04-26 15:50:17 -0700310 goto out;
311 }
312
313 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
314 gfp);
315 rxrpc_put_bundle(trans, bundle);
316out:
317 rxrpc_put_transport(trans);
David Howells15bde722009-02-06 21:50:52 -0800318out_notrans:
David Howells651350d2007-04-26 15:50:17 -0700319 release_sock(&rx->sk);
320 _leave(" = %p", call);
321 return call;
322}
323
324EXPORT_SYMBOL(rxrpc_kernel_begin_call);
325
326/**
327 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
328 * @call: The call to end
329 *
330 * Allow a kernel service to end a call it was using. The call must be
331 * complete before this is called (the call should be aborted if necessary).
332 */
333void rxrpc_kernel_end_call(struct rxrpc_call *call)
334{
335 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
336 rxrpc_remove_user_ID(call->socket, call);
337 rxrpc_put_call(call);
338}
339
340EXPORT_SYMBOL(rxrpc_kernel_end_call);
341
342/**
343 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
344 * @sock: The socket to intercept received messages on
345 * @interceptor: The function to pass the messages to
346 *
347 * Allow a kernel service to intercept messages heading for the Rx queue on an
348 * RxRPC socket. They get passed to the specified function instead.
349 * @interceptor should free the socket buffers it is given. @interceptor is
350 * called with the socket receive queue spinlock held and softirqs disabled -
351 * this ensures that the messages will be delivered in the right order.
352 */
353void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
354 rxrpc_interceptor_t interceptor)
355{
356 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
357
358 _enter("");
359 rx->interceptor = interceptor;
360}
361
362EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
363
David Howells17926a72007-04-26 15:48:28 -0700364/*
365 * connect an RxRPC socket
366 * - this just targets it at a specific destination; no actual connection
367 * negotiation takes place
368 */
369static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
370 int addr_len, int flags)
371{
372 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
373 struct sock *sk = sock->sk;
374 struct rxrpc_transport *trans;
375 struct rxrpc_local *local;
376 struct rxrpc_sock *rx = rxrpc_sk(sk);
377 int ret;
378
379 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
380
381 ret = rxrpc_validate_address(rx, srx, addr_len);
382 if (ret < 0) {
383 _leave(" = %d [bad addr]", ret);
384 return ret;
385 }
386
387 lock_sock(&rx->sk);
388
389 switch (rx->sk.sk_state) {
390 case RXRPC_UNCONNECTED:
391 /* find a local transport endpoint if we don't have one already */
392 ASSERTCMP(rx->local, ==, NULL);
393 rx->srx.srx_family = AF_RXRPC;
394 rx->srx.srx_service = 0;
395 rx->srx.transport_type = srx->transport_type;
396 rx->srx.transport_len = sizeof(sa_family_t);
397 rx->srx.transport.family = srx->transport.family;
398 local = rxrpc_lookup_local(&rx->srx);
399 if (IS_ERR(local)) {
400 release_sock(&rx->sk);
401 return PTR_ERR(local);
402 }
403 rx->local = local;
404 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
405 case RXRPC_CLIENT_BOUND:
406 break;
407 case RXRPC_CLIENT_CONNECTED:
408 release_sock(&rx->sk);
409 return -EISCONN;
410 default:
411 release_sock(&rx->sk);
412 return -EBUSY; /* server sockets can't connect as well */
413 }
414
David Howells651350d2007-04-26 15:50:17 -0700415 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
416 GFP_KERNEL);
David Howells17926a72007-04-26 15:48:28 -0700417 if (IS_ERR(trans)) {
418 release_sock(&rx->sk);
419 _leave(" = %ld", PTR_ERR(trans));
420 return PTR_ERR(trans);
421 }
422
423 rx->trans = trans;
424 rx->service_id = htons(srx->srx_service);
425 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
426
427 release_sock(&rx->sk);
428 return 0;
429}
430
431/*
432 * send a message through an RxRPC socket
433 * - in a client this does a number of things:
434 * - finds/sets up a connection for the security specified (if any)
435 * - initiates a call (ID in control data)
436 * - ends the request phase of a call (if MSG_MORE is not set)
437 * - sends a call data packet
438 * - may send an abort (abort code in control data)
439 */
440static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
441 struct msghdr *m, size_t len)
442{
443 struct rxrpc_transport *trans;
444 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
445 int ret;
446
447 _enter(",{%d},,%zu", rx->sk.sk_state, len);
448
449 if (m->msg_flags & MSG_OOB)
450 return -EOPNOTSUPP;
451
452 if (m->msg_name) {
453 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
454 if (ret < 0) {
455 _leave(" = %d [bad addr]", ret);
456 return ret;
457 }
458 }
459
460 trans = NULL;
461 lock_sock(&rx->sk);
462
463 if (m->msg_name) {
464 ret = -EISCONN;
465 trans = rxrpc_name_to_transport(sock, m->msg_name,
David Howells651350d2007-04-26 15:50:17 -0700466 m->msg_namelen, 0, GFP_KERNEL);
David Howells17926a72007-04-26 15:48:28 -0700467 if (IS_ERR(trans)) {
468 ret = PTR_ERR(trans);
469 trans = NULL;
470 goto out;
471 }
472 } else {
473 trans = rx->trans;
474 if (trans)
475 atomic_inc(&trans->usage);
476 }
477
478 switch (rx->sk.sk_state) {
479 case RXRPC_SERVER_LISTENING:
480 if (!m->msg_name) {
481 ret = rxrpc_server_sendmsg(iocb, rx, m, len);
482 break;
483 }
484 case RXRPC_SERVER_BOUND:
485 case RXRPC_CLIENT_BOUND:
486 if (!m->msg_name) {
487 ret = -ENOTCONN;
488 break;
489 }
490 case RXRPC_CLIENT_CONNECTED:
491 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
492 break;
493 default:
494 ret = -ENOTCONN;
495 break;
496 }
497
498out:
499 release_sock(&rx->sk);
500 if (trans)
501 rxrpc_put_transport(trans);
502 _leave(" = %d", ret);
503 return ret;
504}
505
506/*
507 * set RxRPC socket options
508 */
509static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700510 char __user *optval, unsigned int optlen)
David Howells17926a72007-04-26 15:48:28 -0700511{
512 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
513 unsigned min_sec_level;
514 int ret;
515
516 _enter(",%d,%d,,%d", level, optname, optlen);
517
518 lock_sock(&rx->sk);
519 ret = -EOPNOTSUPP;
520
521 if (level == SOL_RXRPC) {
522 switch (optname) {
523 case RXRPC_EXCLUSIVE_CONNECTION:
524 ret = -EINVAL;
525 if (optlen != 0)
526 goto error;
527 ret = -EISCONN;
528 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
529 goto error;
530 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
531 goto success;
532
533 case RXRPC_SECURITY_KEY:
534 ret = -EINVAL;
535 if (rx->key)
536 goto error;
537 ret = -EISCONN;
538 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
539 goto error;
540 ret = rxrpc_request_key(rx, optval, optlen);
541 goto error;
542
543 case RXRPC_SECURITY_KEYRING:
544 ret = -EINVAL;
545 if (rx->key)
546 goto error;
547 ret = -EISCONN;
548 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
549 goto error;
550 ret = rxrpc_server_keyring(rx, optval, optlen);
551 goto error;
552
553 case RXRPC_MIN_SECURITY_LEVEL:
554 ret = -EINVAL;
555 if (optlen != sizeof(unsigned))
556 goto error;
557 ret = -EISCONN;
558 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
559 goto error;
560 ret = get_user(min_sec_level,
561 (unsigned __user *) optval);
562 if (ret < 0)
563 goto error;
564 ret = -EINVAL;
565 if (min_sec_level > RXRPC_SECURITY_MAX)
566 goto error;
567 rx->min_sec_level = min_sec_level;
568 goto success;
569
570 default:
571 break;
572 }
573 }
574
575success:
576 ret = 0;
577error:
578 release_sock(&rx->sk);
579 return ret;
580}
581
582/*
583 * permit an RxRPC socket to be polled
584 */
585static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
586 poll_table *wait)
587{
588 unsigned int mask;
589 struct sock *sk = sock->sk;
590
Jiri Olsaa57de0b2009-07-08 12:09:13 +0000591 sock_poll_wait(file, sk->sk_sleep, wait);
David Howells17926a72007-04-26 15:48:28 -0700592 mask = 0;
593
594 /* the socket is readable if there are any messages waiting on the Rx
595 * queue */
596 if (!skb_queue_empty(&sk->sk_receive_queue))
597 mask |= POLLIN | POLLRDNORM;
598
599 /* the socket is writable if there is space to add new data to the
600 * socket; there is no guarantee that any particular call in progress
601 * on the socket may have space in the Tx ACK window */
602 if (rxrpc_writable(sk))
603 mask |= POLLOUT | POLLWRNORM;
604
605 return mask;
606}
607
608/*
609 * create an RxRPC socket
610 */
Eric Paris3f378b62009-11-05 22:18:14 -0800611static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
612 int kern)
David Howells17926a72007-04-26 15:48:28 -0700613{
614 struct rxrpc_sock *rx;
615 struct sock *sk;
616
617 _enter("%p,%d", sock, protocol);
618
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800619 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700620 return -EAFNOSUPPORT;
621
David Howells17926a72007-04-26 15:48:28 -0700622 /* we support transport protocol UDP only */
623 if (protocol != PF_INET)
624 return -EPROTONOSUPPORT;
625
626 if (sock->type != SOCK_DGRAM)
627 return -ESOCKTNOSUPPORT;
628
629 sock->ops = &rxrpc_rpc_ops;
630 sock->state = SS_UNCONNECTED;
631
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700632 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
David Howells17926a72007-04-26 15:48:28 -0700633 if (!sk)
634 return -ENOMEM;
635
636 sock_init_data(sock, sk);
637 sk->sk_state = RXRPC_UNCONNECTED;
638 sk->sk_write_space = rxrpc_write_space;
639 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
640 sk->sk_destruct = rxrpc_sock_destructor;
641
642 rx = rxrpc_sk(sk);
643 rx->proto = protocol;
644 rx->calls = RB_ROOT;
645
646 INIT_LIST_HEAD(&rx->listen_link);
647 INIT_LIST_HEAD(&rx->secureq);
648 INIT_LIST_HEAD(&rx->acceptq);
649 rwlock_init(&rx->call_lock);
650 memset(&rx->srx, 0, sizeof(rx->srx));
651
652 _leave(" = 0 [%p]", rx);
653 return 0;
654}
655
656/*
657 * RxRPC socket destructor
658 */
659static void rxrpc_sock_destructor(struct sock *sk)
660{
661 _enter("%p", sk);
662
663 rxrpc_purge_queue(&sk->sk_receive_queue);
664
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700665 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
666 WARN_ON(!sk_unhashed(sk));
667 WARN_ON(sk->sk_socket);
David Howells17926a72007-04-26 15:48:28 -0700668
669 if (!sock_flag(sk, SOCK_DEAD)) {
670 printk("Attempt to release alive rxrpc socket: %p\n", sk);
671 return;
672 }
673}
674
675/*
676 * release an RxRPC socket
677 */
678static int rxrpc_release_sock(struct sock *sk)
679{
680 struct rxrpc_sock *rx = rxrpc_sk(sk);
681
682 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
683
684 /* declare the socket closed for business */
685 sock_orphan(sk);
686 sk->sk_shutdown = SHUTDOWN_MASK;
687
688 spin_lock_bh(&sk->sk_receive_queue.lock);
689 sk->sk_state = RXRPC_CLOSE;
690 spin_unlock_bh(&sk->sk_receive_queue.lock);
691
692 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
693
694 if (!list_empty(&rx->listen_link)) {
695 write_lock_bh(&rx->local->services_lock);
696 list_del(&rx->listen_link);
697 write_unlock_bh(&rx->local->services_lock);
698 }
699
700 /* try to flush out this socket */
701 rxrpc_release_calls_on_socket(rx);
David Howells651350d2007-04-26 15:50:17 -0700702 flush_workqueue(rxrpc_workqueue);
David Howells17926a72007-04-26 15:48:28 -0700703 rxrpc_purge_queue(&sk->sk_receive_queue);
704
705 if (rx->conn) {
706 rxrpc_put_connection(rx->conn);
707 rx->conn = NULL;
708 }
709
710 if (rx->bundle) {
711 rxrpc_put_bundle(rx->trans, rx->bundle);
712 rx->bundle = NULL;
713 }
714 if (rx->trans) {
715 rxrpc_put_transport(rx->trans);
716 rx->trans = NULL;
717 }
718 if (rx->local) {
719 rxrpc_put_local(rx->local);
720 rx->local = NULL;
721 }
722
723 key_put(rx->key);
724 rx->key = NULL;
725 key_put(rx->securities);
726 rx->securities = NULL;
727 sock_put(sk);
728
729 _leave(" = 0");
730 return 0;
731}
732
733/*
734 * release an RxRPC BSD socket on close() or equivalent
735 */
736static int rxrpc_release(struct socket *sock)
737{
738 struct sock *sk = sock->sk;
739
740 _enter("%p{%p}", sock, sk);
741
742 if (!sk)
743 return 0;
744
745 sock->sk = NULL;
746
747 return rxrpc_release_sock(sk);
748}
749
750/*
751 * RxRPC network protocol
752 */
753static const struct proto_ops rxrpc_rpc_ops = {
754 .family = PF_UNIX,
755 .owner = THIS_MODULE,
756 .release = rxrpc_release,
757 .bind = rxrpc_bind,
758 .connect = rxrpc_connect,
759 .socketpair = sock_no_socketpair,
760 .accept = sock_no_accept,
761 .getname = sock_no_getname,
762 .poll = rxrpc_poll,
763 .ioctl = sock_no_ioctl,
764 .listen = rxrpc_listen,
765 .shutdown = sock_no_shutdown,
766 .setsockopt = rxrpc_setsockopt,
767 .getsockopt = sock_no_getsockopt,
768 .sendmsg = rxrpc_sendmsg,
769 .recvmsg = rxrpc_recvmsg,
770 .mmap = sock_no_mmap,
771 .sendpage = sock_no_sendpage,
772};
773
774static struct proto rxrpc_proto = {
775 .name = "RXRPC",
776 .owner = THIS_MODULE,
777 .obj_size = sizeof(struct rxrpc_sock),
778 .max_header = sizeof(struct rxrpc_header),
779};
780
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +0000781static const struct net_proto_family rxrpc_family_ops = {
David Howells17926a72007-04-26 15:48:28 -0700782 .family = PF_RXRPC,
783 .create = rxrpc_create,
784 .owner = THIS_MODULE,
785};
786
787/*
788 * initialise and register the RxRPC protocol
789 */
790static int __init af_rxrpc_init(void)
791{
792 struct sk_buff *dummy_skb;
793 int ret = -1;
794
795 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
796
john stultz2c6b47d2007-07-24 17:47:43 -0700797 rxrpc_epoch = htonl(get_seconds());
David Howells17926a72007-04-26 15:48:28 -0700798
David Howells651350d2007-04-26 15:50:17 -0700799 ret = -ENOMEM;
David Howells17926a72007-04-26 15:48:28 -0700800 rxrpc_call_jar = kmem_cache_create(
801 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +0900802 SLAB_HWCACHE_ALIGN, NULL);
David Howells17926a72007-04-26 15:48:28 -0700803 if (!rxrpc_call_jar) {
804 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
David Howells17926a72007-04-26 15:48:28 -0700805 goto error_call_jar;
806 }
807
David Howells651350d2007-04-26 15:50:17 -0700808 rxrpc_workqueue = create_workqueue("krxrpcd");
809 if (!rxrpc_workqueue) {
810 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
811 goto error_work_queue;
812 }
813
David Howells17926a72007-04-26 15:48:28 -0700814 ret = proto_register(&rxrpc_proto, 1);
YOSHIFUJI Hideaki1c899642007-07-19 10:44:44 +0900815 if (ret < 0) {
816 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
David Howells17926a72007-04-26 15:48:28 -0700817 goto error_proto;
818 }
819
820 ret = sock_register(&rxrpc_family_ops);
821 if (ret < 0) {
YOSHIFUJI Hideaki1c899642007-07-19 10:44:44 +0900822 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
David Howells17926a72007-04-26 15:48:28 -0700823 goto error_sock;
824 }
825
826 ret = register_key_type(&key_type_rxrpc);
827 if (ret < 0) {
YOSHIFUJI Hideaki1c899642007-07-19 10:44:44 +0900828 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
David Howells17926a72007-04-26 15:48:28 -0700829 goto error_key_type;
830 }
831
832 ret = register_key_type(&key_type_rxrpc_s);
833 if (ret < 0) {
YOSHIFUJI Hideaki1c899642007-07-19 10:44:44 +0900834 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
David Howells17926a72007-04-26 15:48:28 -0700835 goto error_key_type_s;
836 }
837
838#ifdef CONFIG_PROC_FS
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200839 proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
840 proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
David Howells17926a72007-04-26 15:48:28 -0700841#endif
842 return 0;
843
844error_key_type_s:
845 unregister_key_type(&key_type_rxrpc);
846error_key_type:
847 sock_unregister(PF_RXRPC);
848error_sock:
849 proto_unregister(&rxrpc_proto);
850error_proto:
David Howells651350d2007-04-26 15:50:17 -0700851 destroy_workqueue(rxrpc_workqueue);
852error_work_queue:
David Howells17926a72007-04-26 15:48:28 -0700853 kmem_cache_destroy(rxrpc_call_jar);
854error_call_jar:
855 return ret;
856}
857
858/*
859 * unregister the RxRPC protocol
860 */
861static void __exit af_rxrpc_exit(void)
862{
863 _enter("");
864 unregister_key_type(&key_type_rxrpc_s);
865 unregister_key_type(&key_type_rxrpc);
866 sock_unregister(PF_RXRPC);
867 proto_unregister(&rxrpc_proto);
868 rxrpc_destroy_all_calls();
869 rxrpc_destroy_all_connections();
870 rxrpc_destroy_all_transports();
871 rxrpc_destroy_all_peers();
872 rxrpc_destroy_all_locals();
873
874 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
875
876 _debug("flush scheduled work");
David Howells651350d2007-04-26 15:50:17 -0700877 flush_workqueue(rxrpc_workqueue);
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200878 proc_net_remove(&init_net, "rxrpc_conns");
879 proc_net_remove(&init_net, "rxrpc_calls");
David Howells651350d2007-04-26 15:50:17 -0700880 destroy_workqueue(rxrpc_workqueue);
David Howells17926a72007-04-26 15:48:28 -0700881 kmem_cache_destroy(rxrpc_call_jar);
882 _leave("");
883}
884
885module_init(af_rxrpc_init);
886module_exit(af_rxrpc_exit);