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[cor_2_6_31.git] / net / rxrpc / af_rxrpc.c
blobbfe493ebf27c36a7a82974af5a596ee8f75528c9
1 /* 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>
17 #include <linux/key-type.h>
18 #include <net/net_namespace.h>
19 #include <net/sock.h>
20 #include <net/af_rxrpc.h>
21 #include "ar-internal.h"
22
23 MODULE_DESCRIPTION("RxRPC network protocol");
24 MODULE_AUTHOR("Red Hat, Inc.");
25 MODULE_LICENSE("GPL");
26 MODULE_ALIAS_NETPROTO(PF_RXRPC);
27
28 unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
29 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
30 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
31
32 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
33
34 static struct proto rxrpc_proto;
35 static 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 */
41 atomic_t rxrpc_debug_id;
42
43 /* count of skbs currently in use */
44 atomic_t rxrpc_n_skbs;
45
46 struct workqueue_struct *rxrpc_workqueue;
47
48 static void rxrpc_sock_destructor(struct sock *);
49
50 /*
51 * see if an RxRPC socket is currently writable
52 */
53 static 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 */
61 static void rxrpc_write_space(struct sock *sk)
62 {
63 _enter("%p", sk);
64 read_lock(&sk->sk_callback_lock);
65 if (rxrpc_writable(sk)) {
66 if (sk_has_sleeper(sk))
67 wake_up_interruptible(sk->sk_sleep);
68 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
69 }
70 read_unlock(&sk->sk_callback_lock);
71 }
72
73 /*
74 * validate an RxRPC address
75 */
76 static 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:
99 _debug("INET: %x @ %pI4",
100 ntohs(srx->transport.sin.sin_port),
101 &srx->transport.sin.sin_addr);
102 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 */
118 static 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
171 service_in_use:
172 ret = -EADDRINUSE;
173 write_unlock_bh(&local->services_lock);
174 error_unlock:
175 release_sock(&rx->sk);
176 error:
177 _leave(" = %d", ret);
178 return ret;
179 }
180
181 /*
182 * set the number of pending calls permitted on a listening socket
183 */
184 static 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 */
219 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
220 struct sockaddr *addr,
221 int addr_len, int flags,
222 gfp_t gfp)
223 {
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 */
240 peer = rxrpc_get_peer(srx, gfp);
241 if (IS_ERR(peer))
242 return ERR_CAST(peer);
243
244 /* find a transport */
245 trans = rxrpc_get_transport(rx->local, peer, gfp);
246 rxrpc_put_peer(peer);
247 _leave(" = %p", trans);
248 return trans;
249 }
250
251 /**
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 */
265 struct 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)) {
285 call = ERR_CAST(trans);
286 trans = NULL;
287 goto out_notrans;
288 }
289 } else {
290 trans = rx->trans;
291 if (!trans) {
292 call = ERR_PTR(-ENOTCONN);
293 goto out_notrans;
294 }
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)) {
309 call = ERR_CAST(bundle);
310 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);
316 out:
317 rxrpc_put_transport(trans);
318 out_notrans:
319 release_sock(&rx->sk);
320 _leave(" = %p", call);
321 return call;
322 }
323
324 EXPORT_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 */
333 void 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
340 EXPORT_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 */
353 void 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
362 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
363
364 /*
365 * connect an RxRPC socket
366 * - this just targets it at a specific destination; no actual connection
367 * negotiation takes place
368 */
369 static 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
415 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
416 GFP_KERNEL);
417 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 */
440 static 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,
466 m->msg_namelen, 0, GFP_KERNEL);
467 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
498 out:
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 */
509 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
510 char __user *optval, int optlen)
511 {
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
575 success:
576 ret = 0;
577 error:
578 release_sock(&rx->sk);
579 return ret;
580 }
581
582 /*
583 * permit an RxRPC socket to be polled
584 */
585 static 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
591 sock_poll_wait(file, sk->sk_sleep, wait);
592 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 */
611 static int rxrpc_create(struct net *net, struct socket *sock, int protocol)
612 {
613 struct rxrpc_sock *rx;
614 struct sock *sk;
615
616 _enter("%p,%d", sock, protocol);
617
618 if (net != &init_net)
619 return -EAFNOSUPPORT;
620
621 /* we support transport protocol UDP only */
622 if (protocol != PF_INET)
623 return -EPROTONOSUPPORT;
624
625 if (sock->type != SOCK_DGRAM)
626 return -ESOCKTNOSUPPORT;
627
628 sock->ops = &rxrpc_rpc_ops;
629 sock->state = SS_UNCONNECTED;
630
631 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
632 if (!sk)
633 return -ENOMEM;
634
635 sock_init_data(sock, sk);
636 sk->sk_state = RXRPC_UNCONNECTED;
637 sk->sk_write_space = rxrpc_write_space;
638 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
639 sk->sk_destruct = rxrpc_sock_destructor;
640
641 rx = rxrpc_sk(sk);
642 rx->proto = protocol;
643 rx->calls = RB_ROOT;
644
645 INIT_LIST_HEAD(&rx->listen_link);
646 INIT_LIST_HEAD(&rx->secureq);
647 INIT_LIST_HEAD(&rx->acceptq);
648 rwlock_init(&rx->call_lock);
649 memset(&rx->srx, 0, sizeof(rx->srx));
650
651 _leave(" = 0 [%p]", rx);
652 return 0;
653 }
654
655 /*
656 * RxRPC socket destructor
657 */
658 static void rxrpc_sock_destructor(struct sock *sk)
659 {
660 _enter("%p", sk);
661
662 rxrpc_purge_queue(&sk->sk_receive_queue);
663
664 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
665 WARN_ON(!sk_unhashed(sk));
666 WARN_ON(sk->sk_socket);
667
668 if (!sock_flag(sk, SOCK_DEAD)) {
669 printk("Attempt to release alive rxrpc socket: %p\n", sk);
670 return;
671 }
672 }
673
674 /*
675 * release an RxRPC socket
676 */
677 static int rxrpc_release_sock(struct sock *sk)
678 {
679 struct rxrpc_sock *rx = rxrpc_sk(sk);
680
681 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
682
683 /* declare the socket closed for business */
684 sock_orphan(sk);
685 sk->sk_shutdown = SHUTDOWN_MASK;
686
687 spin_lock_bh(&sk->sk_receive_queue.lock);
688 sk->sk_state = RXRPC_CLOSE;
689 spin_unlock_bh(&sk->sk_receive_queue.lock);
690
691 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
692
693 if (!list_empty(&rx->listen_link)) {
694 write_lock_bh(&rx->local->services_lock);
695 list_del(&rx->listen_link);
696 write_unlock_bh(&rx->local->services_lock);
697 }
698
699 /* try to flush out this socket */
700 rxrpc_release_calls_on_socket(rx);
701 flush_workqueue(rxrpc_workqueue);
702 rxrpc_purge_queue(&sk->sk_receive_queue);
703
704 if (rx->conn) {
705 rxrpc_put_connection(rx->conn);
706 rx->conn = NULL;
707 }
708
709 if (rx->bundle) {
710 rxrpc_put_bundle(rx->trans, rx->bundle);
711 rx->bundle = NULL;
712 }
713 if (rx->trans) {
714 rxrpc_put_transport(rx->trans);
715 rx->trans = NULL;
716 }
717 if (rx->local) {
718 rxrpc_put_local(rx->local);
719 rx->local = NULL;
720 }
721
722 key_put(rx->key);
723 rx->key = NULL;
724 key_put(rx->securities);
725 rx->securities = NULL;
726 sock_put(sk);
727
728 _leave(" = 0");
729 return 0;
730 }
731
732 /*
733 * release an RxRPC BSD socket on close() or equivalent
734 */
735 static int rxrpc_release(struct socket *sock)
736 {
737 struct sock *sk = sock->sk;
738
739 _enter("%p{%p}", sock, sk);
740
741 if (!sk)
742 return 0;
743
744 sock->sk = NULL;
745
746 return rxrpc_release_sock(sk);
747 }
748
749 /*
750 * RxRPC network protocol
751 */
752 static const struct proto_ops rxrpc_rpc_ops = {
753 .family = PF_UNIX,
754 .owner = THIS_MODULE,
755 .release = rxrpc_release,
756 .bind = rxrpc_bind,
757 .connect = rxrpc_connect,
758 .socketpair = sock_no_socketpair,
759 .accept = sock_no_accept,
760 .getname = sock_no_getname,
761 .poll = rxrpc_poll,
762 .ioctl = sock_no_ioctl,
763 .listen = rxrpc_listen,
764 .shutdown = sock_no_shutdown,
765 .setsockopt = rxrpc_setsockopt,
766 .getsockopt = sock_no_getsockopt,
767 .sendmsg = rxrpc_sendmsg,
768 .recvmsg = rxrpc_recvmsg,
769 .mmap = sock_no_mmap,
770 .sendpage = sock_no_sendpage,
771 };
772
773 static struct proto rxrpc_proto = {
774 .name = "RXRPC",
775 .owner = THIS_MODULE,
776 .obj_size = sizeof(struct rxrpc_sock),
777 .max_header = sizeof(struct rxrpc_header),
778 };
779
780 static struct net_proto_family rxrpc_family_ops = {
781 .family = PF_RXRPC,
782 .create = rxrpc_create,
783 .owner = THIS_MODULE,
784 };
785
786 /*
787 * initialise and register the RxRPC protocol
788 */
789 static int __init af_rxrpc_init(void)
790 {
791 struct sk_buff *dummy_skb;
792 int ret = -1;
793
794 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
795
796 rxrpc_epoch = htonl(get_seconds());
797
798 ret = -ENOMEM;
799 rxrpc_call_jar = kmem_cache_create(
800 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
801 SLAB_HWCACHE_ALIGN, NULL);
802 if (!rxrpc_call_jar) {
803 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
804 goto error_call_jar;
805 }
806
807 rxrpc_workqueue = create_workqueue("krxrpcd");
808 if (!rxrpc_workqueue) {
809 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
810 goto error_work_queue;
811 }
812
813 ret = proto_register(&rxrpc_proto, 1);
814 if (ret < 0) {
815 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
816 goto error_proto;
817 }
818
819 ret = sock_register(&rxrpc_family_ops);
820 if (ret < 0) {
821 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
822 goto error_sock;
823 }
824
825 ret = register_key_type(&key_type_rxrpc);
826 if (ret < 0) {
827 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
828 goto error_key_type;
829 }
830
831 ret = register_key_type(&key_type_rxrpc_s);
832 if (ret < 0) {
833 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
834 goto error_key_type_s;
835 }
836
837 #ifdef CONFIG_PROC_FS
838 proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
839 proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
840 #endif
841 return 0;
842
843 error_key_type_s:
844 unregister_key_type(&key_type_rxrpc);
845 error_key_type:
846 sock_unregister(PF_RXRPC);
847 error_sock:
848 proto_unregister(&rxrpc_proto);
849 error_proto:
850 destroy_workqueue(rxrpc_workqueue);
851 error_work_queue:
852 kmem_cache_destroy(rxrpc_call_jar);
853 error_call_jar:
854 return ret;
855 }
856
857 /*
858 * unregister the RxRPC protocol
859 */
860 static void __exit af_rxrpc_exit(void)
861 {
862 _enter("");
863 unregister_key_type(&key_type_rxrpc_s);
864 unregister_key_type(&key_type_rxrpc);
865 sock_unregister(PF_RXRPC);
866 proto_unregister(&rxrpc_proto);
867 rxrpc_destroy_all_calls();
868 rxrpc_destroy_all_connections();
869 rxrpc_destroy_all_transports();
870 rxrpc_destroy_all_peers();
871 rxrpc_destroy_all_locals();
872
873 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
874
875 _debug("flush scheduled work");
876 flush_workqueue(rxrpc_workqueue);
877 proc_net_remove(&init_net, "rxrpc_conns");
878 proc_net_remove(&init_net, "rxrpc_calls");
879 destroy_workqueue(rxrpc_workqueue);
880 kmem_cache_destroy(rxrpc_call_jar);
881 _leave("");
882 }
883
884 module_init(af_rxrpc_init);
885 module_exit(af_rxrpc_exit);
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