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Merge branch 'akpm'
[linux-2.6/next.git] / net / rxrpc / af_rxrpc.c
blob74c064c0dfddca0c1aaf599ffaf66465b4259373
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/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/poll.h>
17 #include <linux/proc_fs.h>
18 #include <linux/key-type.h>
19 #include <net/net_namespace.h>
20 #include <net/sock.h>
21 #include <net/af_rxrpc.h>
22 #include "ar-internal.h"
23
24 MODULE_DESCRIPTION("RxRPC network protocol");
25 MODULE_AUTHOR("Red Hat, Inc.");
26 MODULE_LICENSE("GPL");
27 MODULE_ALIAS_NETPROTO(PF_RXRPC);
28
29 unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
30 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
31 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
32
33 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
34
35 static struct proto rxrpc_proto;
36 static const struct proto_ops rxrpc_rpc_ops;
37
38 /* local epoch for detecting local-end reset */
39 __be32 rxrpc_epoch;
40
41 /* current debugging ID */
42 atomic_t rxrpc_debug_id;
43
44 /* count of skbs currently in use */
45 atomic_t rxrpc_n_skbs;
46
47 struct workqueue_struct *rxrpc_workqueue;
48
49 static void rxrpc_sock_destructor(struct sock *);
50
51 /*
52 * see if an RxRPC socket is currently writable
53 */
54 static inline int rxrpc_writable(struct sock *sk)
55 {
56 return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
57 }
58
59 /*
60 * wait for write bufferage to become available
61 */
62 static void rxrpc_write_space(struct sock *sk)
63 {
64 _enter("%p", sk);
65 rcu_read_lock();
66 if (rxrpc_writable(sk)) {
67 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
68
69 if (wq_has_sleeper(wq))
70 wake_up_interruptible(&wq->wait);
71 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
72 }
73 rcu_read_unlock();
74 }
75
76 /*
77 * validate an RxRPC address
78 */
79 static int rxrpc_validate_address(struct rxrpc_sock *rx,
80 struct sockaddr_rxrpc *srx,
81 int len)
82 {
83 if (len < sizeof(struct sockaddr_rxrpc))
84 return -EINVAL;
85
86 if (srx->srx_family != AF_RXRPC)
87 return -EAFNOSUPPORT;
88
89 if (srx->transport_type != SOCK_DGRAM)
90 return -ESOCKTNOSUPPORT;
91
92 len -= offsetof(struct sockaddr_rxrpc, transport);
93 if (srx->transport_len < sizeof(sa_family_t) ||
94 srx->transport_len > len)
95 return -EINVAL;
96
97 if (srx->transport.family != rx->proto)
98 return -EAFNOSUPPORT;
99
100 switch (srx->transport.family) {
101 case AF_INET:
102 _debug("INET: %x @ %pI4",
103 ntohs(srx->transport.sin.sin_port),
104 &srx->transport.sin.sin_addr);
105 if (srx->transport_len > 8)
106 memset((void *)&srx->transport + 8, 0,
107 srx->transport_len - 8);
108 break;
109
110 case AF_INET6:
111 default:
112 return -EAFNOSUPPORT;
113 }
114
115 return 0;
116 }
117
118 /*
119 * bind a local address to an RxRPC socket
120 */
121 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
122 {
123 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
124 struct sock *sk = sock->sk;
125 struct rxrpc_local *local;
126 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
127 __be16 service_id;
128 int ret;
129
130 _enter("%p,%p,%d", rx, saddr, len);
131
132 ret = rxrpc_validate_address(rx, srx, len);
133 if (ret < 0)
134 goto error;
135
136 lock_sock(&rx->sk);
137
138 if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
139 ret = -EINVAL;
140 goto error_unlock;
141 }
142
143 memcpy(&rx->srx, srx, sizeof(rx->srx));
144
145 /* find a local transport endpoint if we don't have one already */
146 local = rxrpc_lookup_local(&rx->srx);
147 if (IS_ERR(local)) {
148 ret = PTR_ERR(local);
149 goto error_unlock;
150 }
151
152 rx->local = local;
153 if (srx->srx_service) {
154 service_id = htons(srx->srx_service);
155 write_lock_bh(&local->services_lock);
156 list_for_each_entry(prx, &local->services, listen_link) {
157 if (prx->service_id == service_id)
158 goto service_in_use;
159 }
160
161 rx->service_id = service_id;
162 list_add_tail(&rx->listen_link, &local->services);
163 write_unlock_bh(&local->services_lock);
164
165 rx->sk.sk_state = RXRPC_SERVER_BOUND;
166 } else {
167 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
168 }
169
170 release_sock(&rx->sk);
171 _leave(" = 0");
172 return 0;
173
174 service_in_use:
175 ret = -EADDRINUSE;
176 write_unlock_bh(&local->services_lock);
177 error_unlock:
178 release_sock(&rx->sk);
179 error:
180 _leave(" = %d", ret);
181 return ret;
182 }
183
184 /*
185 * set the number of pending calls permitted on a listening socket
186 */
187 static int rxrpc_listen(struct socket *sock, int backlog)
188 {
189 struct sock *sk = sock->sk;
190 struct rxrpc_sock *rx = rxrpc_sk(sk);
191 int ret;
192
193 _enter("%p,%d", rx, backlog);
194
195 lock_sock(&rx->sk);
196
197 switch (rx->sk.sk_state) {
198 case RXRPC_UNCONNECTED:
199 ret = -EADDRNOTAVAIL;
200 break;
201 case RXRPC_CLIENT_BOUND:
202 case RXRPC_CLIENT_CONNECTED:
203 default:
204 ret = -EBUSY;
205 break;
206 case RXRPC_SERVER_BOUND:
207 ASSERT(rx->local != NULL);
208 sk->sk_max_ack_backlog = backlog;
209 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
210 ret = 0;
211 break;
212 }
213
214 release_sock(&rx->sk);
215 _leave(" = %d", ret);
216 return ret;
217 }
218
219 /*
220 * find a transport by address
221 */
222 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
223 struct sockaddr *addr,
224 int addr_len, int flags,
225 gfp_t gfp)
226 {
227 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
228 struct rxrpc_transport *trans;
229 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
230 struct rxrpc_peer *peer;
231
232 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
233
234 ASSERT(rx->local != NULL);
235 ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
236
237 if (rx->srx.transport_type != srx->transport_type)
238 return ERR_PTR(-ESOCKTNOSUPPORT);
239 if (rx->srx.transport.family != srx->transport.family)
240 return ERR_PTR(-EAFNOSUPPORT);
241
242 /* find a remote transport endpoint from the local one */
243 peer = rxrpc_get_peer(srx, gfp);
244 if (IS_ERR(peer))
245 return ERR_CAST(peer);
246
247 /* find a transport */
248 trans = rxrpc_get_transport(rx->local, peer, gfp);
249 rxrpc_put_peer(peer);
250 _leave(" = %p", trans);
251 return trans;
252 }
253
254 /**
255 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
256 * @sock: The socket on which to make the call
257 * @srx: The address of the peer to contact (defaults to socket setting)
258 * @key: The security context to use (defaults to socket setting)
259 * @user_call_ID: The ID to use
260 *
261 * Allow a kernel service to begin a call on the nominated socket. This just
262 * sets up all the internal tracking structures and allocates connection and
263 * call IDs as appropriate. The call to be used is returned.
264 *
265 * The default socket destination address and security may be overridden by
266 * supplying @srx and @key.
267 */
268 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
269 struct sockaddr_rxrpc *srx,
270 struct key *key,
271 unsigned long user_call_ID,
272 gfp_t gfp)
273 {
274 struct rxrpc_conn_bundle *bundle;
275 struct rxrpc_transport *trans;
276 struct rxrpc_call *call;
277 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
278 __be16 service_id;
279
280 _enter(",,%x,%lx", key_serial(key), user_call_ID);
281
282 lock_sock(&rx->sk);
283
284 if (srx) {
285 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
286 sizeof(*srx), 0, gfp);
287 if (IS_ERR(trans)) {
288 call = ERR_CAST(trans);
289 trans = NULL;
290 goto out_notrans;
291 }
292 } else {
293 trans = rx->trans;
294 if (!trans) {
295 call = ERR_PTR(-ENOTCONN);
296 goto out_notrans;
297 }
298 atomic_inc(&trans->usage);
299 }
300
301 service_id = rx->service_id;
302 if (srx)
303 service_id = htons(srx->srx_service);
304
305 if (!key)
306 key = rx->key;
307 if (key && !key->payload.data)
308 key = NULL; /* a no-security key */
309
310 bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
311 if (IS_ERR(bundle)) {
312 call = ERR_CAST(bundle);
313 goto out;
314 }
315
316 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
317 gfp);
318 rxrpc_put_bundle(trans, bundle);
319 out:
320 rxrpc_put_transport(trans);
321 out_notrans:
322 release_sock(&rx->sk);
323 _leave(" = %p", call);
324 return call;
325 }
326
327 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
328
329 /**
330 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
331 * @call: The call to end
332 *
333 * Allow a kernel service to end a call it was using. The call must be
334 * complete before this is called (the call should be aborted if necessary).
335 */
336 void rxrpc_kernel_end_call(struct rxrpc_call *call)
337 {
338 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
339 rxrpc_remove_user_ID(call->socket, call);
340 rxrpc_put_call(call);
341 }
342
343 EXPORT_SYMBOL(rxrpc_kernel_end_call);
344
345 /**
346 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
347 * @sock: The socket to intercept received messages on
348 * @interceptor: The function to pass the messages to
349 *
350 * Allow a kernel service to intercept messages heading for the Rx queue on an
351 * RxRPC socket. They get passed to the specified function instead.
352 * @interceptor should free the socket buffers it is given. @interceptor is
353 * called with the socket receive queue spinlock held and softirqs disabled -
354 * this ensures that the messages will be delivered in the right order.
355 */
356 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
357 rxrpc_interceptor_t interceptor)
358 {
359 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
360
361 _enter("");
362 rx->interceptor = interceptor;
363 }
364
365 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
366
367 /*
368 * connect an RxRPC socket
369 * - this just targets it at a specific destination; no actual connection
370 * negotiation takes place
371 */
372 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
373 int addr_len, int flags)
374 {
375 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
376 struct sock *sk = sock->sk;
377 struct rxrpc_transport *trans;
378 struct rxrpc_local *local;
379 struct rxrpc_sock *rx = rxrpc_sk(sk);
380 int ret;
381
382 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
383
384 ret = rxrpc_validate_address(rx, srx, addr_len);
385 if (ret < 0) {
386 _leave(" = %d [bad addr]", ret);
387 return ret;
388 }
389
390 lock_sock(&rx->sk);
391
392 switch (rx->sk.sk_state) {
393 case RXRPC_UNCONNECTED:
394 /* find a local transport endpoint if we don't have one already */
395 ASSERTCMP(rx->local, ==, NULL);
396 rx->srx.srx_family = AF_RXRPC;
397 rx->srx.srx_service = 0;
398 rx->srx.transport_type = srx->transport_type;
399 rx->srx.transport_len = sizeof(sa_family_t);
400 rx->srx.transport.family = srx->transport.family;
401 local = rxrpc_lookup_local(&rx->srx);
402 if (IS_ERR(local)) {
403 release_sock(&rx->sk);
404 return PTR_ERR(local);
405 }
406 rx->local = local;
407 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
408 case RXRPC_CLIENT_BOUND:
409 break;
410 case RXRPC_CLIENT_CONNECTED:
411 release_sock(&rx->sk);
412 return -EISCONN;
413 default:
414 release_sock(&rx->sk);
415 return -EBUSY; /* server sockets can't connect as well */
416 }
417
418 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
419 GFP_KERNEL);
420 if (IS_ERR(trans)) {
421 release_sock(&rx->sk);
422 _leave(" = %ld", PTR_ERR(trans));
423 return PTR_ERR(trans);
424 }
425
426 rx->trans = trans;
427 rx->service_id = htons(srx->srx_service);
428 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
429
430 release_sock(&rx->sk);
431 return 0;
432 }
433
434 /*
435 * send a message through an RxRPC socket
436 * - in a client this does a number of things:
437 * - finds/sets up a connection for the security specified (if any)
438 * - initiates a call (ID in control data)
439 * - ends the request phase of a call (if MSG_MORE is not set)
440 * - sends a call data packet
441 * - may send an abort (abort code in control data)
442 */
443 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
444 struct msghdr *m, size_t len)
445 {
446 struct rxrpc_transport *trans;
447 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
448 int ret;
449
450 _enter(",{%d},,%zu", rx->sk.sk_state, len);
451
452 if (m->msg_flags & MSG_OOB)
453 return -EOPNOTSUPP;
454
455 if (m->msg_name) {
456 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
457 if (ret < 0) {
458 _leave(" = %d [bad addr]", ret);
459 return ret;
460 }
461 }
462
463 trans = NULL;
464 lock_sock(&rx->sk);
465
466 if (m->msg_name) {
467 ret = -EISCONN;
468 trans = rxrpc_name_to_transport(sock, m->msg_name,
469 m->msg_namelen, 0, GFP_KERNEL);
470 if (IS_ERR(trans)) {
471 ret = PTR_ERR(trans);
472 trans = NULL;
473 goto out;
474 }
475 } else {
476 trans = rx->trans;
477 if (trans)
478 atomic_inc(&trans->usage);
479 }
480
481 switch (rx->sk.sk_state) {
482 case RXRPC_SERVER_LISTENING:
483 if (!m->msg_name) {
484 ret = rxrpc_server_sendmsg(iocb, rx, m, len);
485 break;
486 }
487 case RXRPC_SERVER_BOUND:
488 case RXRPC_CLIENT_BOUND:
489 if (!m->msg_name) {
490 ret = -ENOTCONN;
491 break;
492 }
493 case RXRPC_CLIENT_CONNECTED:
494 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
495 break;
496 default:
497 ret = -ENOTCONN;
498 break;
499 }
500
501 out:
502 release_sock(&rx->sk);
503 if (trans)
504 rxrpc_put_transport(trans);
505 _leave(" = %d", ret);
506 return ret;
507 }
508
509 /*
510 * set RxRPC socket options
511 */
512 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
513 char __user *optval, unsigned int optlen)
514 {
515 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
516 unsigned min_sec_level;
517 int ret;
518
519 _enter(",%d,%d,,%d", level, optname, optlen);
520
521 lock_sock(&rx->sk);
522 ret = -EOPNOTSUPP;
523
524 if (level == SOL_RXRPC) {
525 switch (optname) {
526 case RXRPC_EXCLUSIVE_CONNECTION:
527 ret = -EINVAL;
528 if (optlen != 0)
529 goto error;
530 ret = -EISCONN;
531 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
532 goto error;
533 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
534 goto success;
535
536 case RXRPC_SECURITY_KEY:
537 ret = -EINVAL;
538 if (rx->key)
539 goto error;
540 ret = -EISCONN;
541 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
542 goto error;
543 ret = rxrpc_request_key(rx, optval, optlen);
544 goto error;
545
546 case RXRPC_SECURITY_KEYRING:
547 ret = -EINVAL;
548 if (rx->key)
549 goto error;
550 ret = -EISCONN;
551 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
552 goto error;
553 ret = rxrpc_server_keyring(rx, optval, optlen);
554 goto error;
555
556 case RXRPC_MIN_SECURITY_LEVEL:
557 ret = -EINVAL;
558 if (optlen != sizeof(unsigned))
559 goto error;
560 ret = -EISCONN;
561 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
562 goto error;
563 ret = get_user(min_sec_level,
564 (unsigned __user *) optval);
565 if (ret < 0)
566 goto error;
567 ret = -EINVAL;
568 if (min_sec_level > RXRPC_SECURITY_MAX)
569 goto error;
570 rx->min_sec_level = min_sec_level;
571 goto success;
572
573 default:
574 break;
575 }
576 }
577
578 success:
579 ret = 0;
580 error:
581 release_sock(&rx->sk);
582 return ret;
583 }
584
585 /*
586 * permit an RxRPC socket to be polled
587 */
588 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
589 poll_table *wait)
590 {
591 unsigned int mask;
592 struct sock *sk = sock->sk;
593
594 sock_poll_wait(file, sk_sleep(sk), wait);
595 mask = 0;
596
597 /* the socket is readable if there are any messages waiting on the Rx
598 * queue */
599 if (!skb_queue_empty(&sk->sk_receive_queue))
600 mask |= POLLIN | POLLRDNORM;
601
602 /* the socket is writable if there is space to add new data to the
603 * socket; there is no guarantee that any particular call in progress
604 * on the socket may have space in the Tx ACK window */
605 if (rxrpc_writable(sk))
606 mask |= POLLOUT | POLLWRNORM;
607
608 return mask;
609 }
610
611 /*
612 * create an RxRPC socket
613 */
614 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
615 int kern)
616 {
617 struct rxrpc_sock *rx;
618 struct sock *sk;
619
620 _enter("%p,%d", sock, protocol);
621
622 if (!net_eq(net, &init_net))
623 return -EAFNOSUPPORT;
624
625 /* we support transport protocol UDP only */
626 if (protocol != PF_INET)
627 return -EPROTONOSUPPORT;
628
629 if (sock->type != SOCK_DGRAM)
630 return -ESOCKTNOSUPPORT;
631
632 sock->ops = &rxrpc_rpc_ops;
633 sock->state = SS_UNCONNECTED;
634
635 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
636 if (!sk)
637 return -ENOMEM;
638
639 sock_init_data(sock, sk);
640 sk->sk_state = RXRPC_UNCONNECTED;
641 sk->sk_write_space = rxrpc_write_space;
642 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
643 sk->sk_destruct = rxrpc_sock_destructor;
644
645 rx = rxrpc_sk(sk);
646 rx->proto = protocol;
647 rx->calls = RB_ROOT;
648
649 INIT_LIST_HEAD(&rx->listen_link);
650 INIT_LIST_HEAD(&rx->secureq);
651 INIT_LIST_HEAD(&rx->acceptq);
652 rwlock_init(&rx->call_lock);
653 memset(&rx->srx, 0, sizeof(rx->srx));
654
655 _leave(" = 0 [%p]", rx);
656 return 0;
657 }
658
659 /*
660 * RxRPC socket destructor
661 */
662 static void rxrpc_sock_destructor(struct sock *sk)
663 {
664 _enter("%p", sk);
665
666 rxrpc_purge_queue(&sk->sk_receive_queue);
667
668 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
669 WARN_ON(!sk_unhashed(sk));
670 WARN_ON(sk->sk_socket);
671
672 if (!sock_flag(sk, SOCK_DEAD)) {
673 printk("Attempt to release alive rxrpc socket: %p\n", sk);
674 return;
675 }
676 }
677
678 /*
679 * release an RxRPC socket
680 */
681 static int rxrpc_release_sock(struct sock *sk)
682 {
683 struct rxrpc_sock *rx = rxrpc_sk(sk);
684
685 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
686
687 /* declare the socket closed for business */
688 sock_orphan(sk);
689 sk->sk_shutdown = SHUTDOWN_MASK;
690
691 spin_lock_bh(&sk->sk_receive_queue.lock);
692 sk->sk_state = RXRPC_CLOSE;
693 spin_unlock_bh(&sk->sk_receive_queue.lock);
694
695 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
696
697 if (!list_empty(&rx->listen_link)) {
698 write_lock_bh(&rx->local->services_lock);
699 list_del(&rx->listen_link);
700 write_unlock_bh(&rx->local->services_lock);
701 }
702
703 /* try to flush out this socket */
704 rxrpc_release_calls_on_socket(rx);
705 flush_workqueue(rxrpc_workqueue);
706 rxrpc_purge_queue(&sk->sk_receive_queue);
707
708 if (rx->conn) {
709 rxrpc_put_connection(rx->conn);
710 rx->conn = NULL;
711 }
712
713 if (rx->bundle) {
714 rxrpc_put_bundle(rx->trans, rx->bundle);
715 rx->bundle = NULL;
716 }
717 if (rx->trans) {
718 rxrpc_put_transport(rx->trans);
719 rx->trans = NULL;
720 }
721 if (rx->local) {
722 rxrpc_put_local(rx->local);
723 rx->local = NULL;
724 }
725
726 key_put(rx->key);
727 rx->key = NULL;
728 key_put(rx->securities);
729 rx->securities = NULL;
730 sock_put(sk);
731
732 _leave(" = 0");
733 return 0;
734 }
735
736 /*
737 * release an RxRPC BSD socket on close() or equivalent
738 */
739 static int rxrpc_release(struct socket *sock)
740 {
741 struct sock *sk = sock->sk;
742
743 _enter("%p{%p}", sock, sk);
744
745 if (!sk)
746 return 0;
747
748 sock->sk = NULL;
749
750 return rxrpc_release_sock(sk);
751 }
752
753 /*
754 * RxRPC network protocol
755 */
756 static const struct proto_ops rxrpc_rpc_ops = {
757 .family = PF_UNIX,
758 .owner = THIS_MODULE,
759 .release = rxrpc_release,
760 .bind = rxrpc_bind,
761 .connect = rxrpc_connect,
762 .socketpair = sock_no_socketpair,
763 .accept = sock_no_accept,
764 .getname = sock_no_getname,
765 .poll = rxrpc_poll,
766 .ioctl = sock_no_ioctl,
767 .listen = rxrpc_listen,
768 .shutdown = sock_no_shutdown,
769 .setsockopt = rxrpc_setsockopt,
770 .getsockopt = sock_no_getsockopt,
771 .sendmsg = rxrpc_sendmsg,
772 .recvmsg = rxrpc_recvmsg,
773 .mmap = sock_no_mmap,
774 .sendpage = sock_no_sendpage,
775 };
776
777 static struct proto rxrpc_proto = {
778 .name = "RXRPC",
779 .owner = THIS_MODULE,
780 .obj_size = sizeof(struct rxrpc_sock),
781 .max_header = sizeof(struct rxrpc_header),
782 };
783
784 static const struct net_proto_family rxrpc_family_ops = {
785 .family = PF_RXRPC,
786 .create = rxrpc_create,
787 .owner = THIS_MODULE,
788 };
789
790 /*
791 * initialise and register the RxRPC protocol
792 */
793 static int __init af_rxrpc_init(void)
794 {
795 struct sk_buff *dummy_skb;
796 int ret = -1;
797
798 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
799
800 rxrpc_epoch = htonl(get_seconds());
801
802 ret = -ENOMEM;
803 rxrpc_call_jar = kmem_cache_create(
804 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
805 SLAB_HWCACHE_ALIGN, NULL);
806 if (!rxrpc_call_jar) {
807 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
808 goto error_call_jar;
809 }
810
811 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
812 if (!rxrpc_workqueue) {
813 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
814 goto error_work_queue;
815 }
816
817 ret = proto_register(&rxrpc_proto, 1);
818 if (ret < 0) {
819 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
820 goto error_proto;
821 }
822
823 ret = sock_register(&rxrpc_family_ops);
824 if (ret < 0) {
825 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
826 goto error_sock;
827 }
828
829 ret = register_key_type(&key_type_rxrpc);
830 if (ret < 0) {
831 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
832 goto error_key_type;
833 }
834
835 ret = register_key_type(&key_type_rxrpc_s);
836 if (ret < 0) {
837 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
838 goto error_key_type_s;
839 }
840
841 #ifdef CONFIG_PROC_FS
842 proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
843 proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
844 #endif
845 return 0;
846
847 error_key_type_s:
848 unregister_key_type(&key_type_rxrpc);
849 error_key_type:
850 sock_unregister(PF_RXRPC);
851 error_sock:
852 proto_unregister(&rxrpc_proto);
853 error_proto:
854 destroy_workqueue(rxrpc_workqueue);
855 error_work_queue:
856 kmem_cache_destroy(rxrpc_call_jar);
857 error_call_jar:
858 return ret;
859 }
860
861 /*
862 * unregister the RxRPC protocol
863 */
864 static void __exit af_rxrpc_exit(void)
865 {
866 _enter("");
867 unregister_key_type(&key_type_rxrpc_s);
868 unregister_key_type(&key_type_rxrpc);
869 sock_unregister(PF_RXRPC);
870 proto_unregister(&rxrpc_proto);
871 rxrpc_destroy_all_calls();
872 rxrpc_destroy_all_connections();
873 rxrpc_destroy_all_transports();
874 rxrpc_destroy_all_peers();
875 rxrpc_destroy_all_locals();
876
877 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
878
879 _debug("flush scheduled work");
880 flush_workqueue(rxrpc_workqueue);
881 proc_net_remove(&init_net, "rxrpc_conns");
882 proc_net_remove(&init_net, "rxrpc_calls");
883 destroy_workqueue(rxrpc_workqueue);
884 kmem_cache_destroy(rxrpc_call_jar);
885 _leave("");
886 }
887
888 module_init(af_rxrpc_init);
889 module_exit(af_rxrpc_exit);
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