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Linux/net/rxrpc/af_rxrpc.c

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  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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 
 14 #include <linux/module.h>
 15 #include <linux/kernel.h>
 16 #include <linux/net.h>
 17 #include <linux/slab.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/random.h>
 20 #include <linux/poll.h>
 21 #include <linux/proc_fs.h>
 22 #include <linux/key-type.h>
 23 #include <net/net_namespace.h>
 24 #include <net/sock.h>
 25 #include <net/af_rxrpc.h>
 26 #define CREATE_TRACE_POINTS
 27 #include "ar-internal.h"
 28 
 29 MODULE_DESCRIPTION("RxRPC network protocol");
 30 MODULE_AUTHOR("Red Hat, Inc.");
 31 MODULE_LICENSE("GPL");
 32 MODULE_ALIAS_NETPROTO(PF_RXRPC);
 33 
 34 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
 35 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
 36 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
 37 
 38 static struct proto rxrpc_proto;
 39 static const struct proto_ops rxrpc_rpc_ops;
 40 
 41 /* local epoch for detecting local-end reset */
 42 u32 rxrpc_epoch;
 43 
 44 /* current debugging ID */
 45 atomic_t rxrpc_debug_id;
 46 
 47 /* count of skbs currently in use */
 48 atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 49 
 50 struct workqueue_struct *rxrpc_workqueue;
 51 
 52 static void rxrpc_sock_destructor(struct sock *);
 53 
 54 /*
 55  * see if an RxRPC socket is currently writable
 56  */
 57 static inline int rxrpc_writable(struct sock *sk)
 58 {
 59         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
 60 }
 61 
 62 /*
 63  * wait for write bufferage to become available
 64  */
 65 static void rxrpc_write_space(struct sock *sk)
 66 {
 67         _enter("%p", sk);
 68         rcu_read_lock();
 69         if (rxrpc_writable(sk)) {
 70                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
 71 
 72                 if (skwq_has_sleeper(wq))
 73                         wake_up_interruptible(&wq->wait);
 74                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 75         }
 76         rcu_read_unlock();
 77 }
 78 
 79 /*
 80  * validate an RxRPC address
 81  */
 82 static int rxrpc_validate_address(struct rxrpc_sock *rx,
 83                                   struct sockaddr_rxrpc *srx,
 84                                   int len)
 85 {
 86         unsigned int tail;
 87 
 88         if (len < sizeof(struct sockaddr_rxrpc))
 89                 return -EINVAL;
 90 
 91         if (srx->srx_family != AF_RXRPC)
 92                 return -EAFNOSUPPORT;
 93 
 94         if (srx->transport_type != SOCK_DGRAM)
 95                 return -ESOCKTNOSUPPORT;
 96 
 97         len -= offsetof(struct sockaddr_rxrpc, transport);
 98         if (srx->transport_len < sizeof(sa_family_t) ||
 99             srx->transport_len > len)
100                 return -EINVAL;
101 
102         if (srx->transport.family != rx->family)
103                 return -EAFNOSUPPORT;
104 
105         switch (srx->transport.family) {
106         case AF_INET:
107                 if (srx->transport_len < sizeof(struct sockaddr_in))
108                         return -EINVAL;
109                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
110                 break;
111 
112 #ifdef CONFIG_AF_RXRPC_IPV6
113         case AF_INET6:
114                 if (srx->transport_len < sizeof(struct sockaddr_in6))
115                         return -EINVAL;
116                 tail = offsetof(struct sockaddr_rxrpc, transport) +
117                         sizeof(struct sockaddr_in6);
118                 break;
119 #endif
120 
121         default:
122                 return -EAFNOSUPPORT;
123         }
124 
125         if (tail < len)
126                 memset((void *)srx + tail, 0, len - tail);
127         _debug("INET: %pISp", &srx->transport);
128         return 0;
129 }
130 
131 /*
132  * bind a local address to an RxRPC socket
133  */
134 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
135 {
136         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
137         struct sock *sk = sock->sk;
138         struct rxrpc_local *local;
139         struct rxrpc_sock *rx = rxrpc_sk(sk);
140         u16 service_id = srx->srx_service;
141         int ret;
142 
143         _enter("%p,%p,%d", rx, saddr, len);
144 
145         ret = rxrpc_validate_address(rx, srx, len);
146         if (ret < 0)
147                 goto error;
148 
149         lock_sock(&rx->sk);
150 
151         if (rx->sk.sk_state != RXRPC_UNBOUND) {
152                 ret = -EINVAL;
153                 goto error_unlock;
154         }
155 
156         memcpy(&rx->srx, srx, sizeof(rx->srx));
157 
158         local = rxrpc_lookup_local(&rx->srx);
159         if (IS_ERR(local)) {
160                 ret = PTR_ERR(local);
161                 goto error_unlock;
162         }
163 
164         if (service_id) {
165                 write_lock(&local->services_lock);
166                 if (rcu_access_pointer(local->service))
167                         goto service_in_use;
168                 rx->local = local;
169                 rcu_assign_pointer(local->service, rx);
170                 write_unlock(&local->services_lock);
171 
172                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
173         } else {
174                 rx->local = local;
175                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
176         }
177 
178         release_sock(&rx->sk);
179         _leave(" = 0");
180         return 0;
181 
182 service_in_use:
183         write_unlock(&local->services_lock);
184         rxrpc_put_local(local);
185         ret = -EADDRINUSE;
186 error_unlock:
187         release_sock(&rx->sk);
188 error:
189         _leave(" = %d", ret);
190         return ret;
191 }
192 
193 /*
194  * set the number of pending calls permitted on a listening socket
195  */
196 static int rxrpc_listen(struct socket *sock, int backlog)
197 {
198         struct sock *sk = sock->sk;
199         struct rxrpc_sock *rx = rxrpc_sk(sk);
200         unsigned int max, old;
201         int ret;
202 
203         _enter("%p,%d", rx, backlog);
204 
205         lock_sock(&rx->sk);
206 
207         switch (rx->sk.sk_state) {
208         case RXRPC_UNBOUND:
209                 ret = -EADDRNOTAVAIL;
210                 break;
211         case RXRPC_SERVER_BOUND:
212                 ASSERT(rx->local != NULL);
213                 max = READ_ONCE(rxrpc_max_backlog);
214                 ret = -EINVAL;
215                 if (backlog == INT_MAX)
216                         backlog = max;
217                 else if (backlog < 0 || backlog > max)
218                         break;
219                 old = sk->sk_max_ack_backlog;
220                 sk->sk_max_ack_backlog = backlog;
221                 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
222                 if (ret == 0)
223                         rx->sk.sk_state = RXRPC_SERVER_LISTENING;
224                 else
225                         sk->sk_max_ack_backlog = old;
226                 break;
227         case RXRPC_SERVER_LISTENING:
228                 if (backlog == 0) {
229                         rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
230                         sk->sk_max_ack_backlog = 0;
231                         rxrpc_discard_prealloc(rx);
232                         ret = 0;
233                         break;
234                 }
235         default:
236                 ret = -EBUSY;
237                 break;
238         }
239 
240         release_sock(&rx->sk);
241         _leave(" = %d", ret);
242         return ret;
243 }
244 
245 /**
246  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
247  * @sock: The socket on which to make the call
248  * @srx: The address of the peer to contact
249  * @key: The security context to use (defaults to socket setting)
250  * @user_call_ID: The ID to use
251  * @gfp: The allocation constraints
252  * @notify_rx: Where to send notifications instead of socket queue
253  *
254  * Allow a kernel service to begin a call on the nominated socket.  This just
255  * sets up all the internal tracking structures and allocates connection and
256  * call IDs as appropriate.  The call to be used is returned.
257  *
258  * The default socket destination address and security may be overridden by
259  * supplying @srx and @key.
260  */
261 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
262                                            struct sockaddr_rxrpc *srx,
263                                            struct key *key,
264                                            unsigned long user_call_ID,
265                                            gfp_t gfp,
266                                            rxrpc_notify_rx_t notify_rx)
267 {
268         struct rxrpc_conn_parameters cp;
269         struct rxrpc_call *call;
270         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
271         int ret;
272 
273         _enter(",,%x,%lx", key_serial(key), user_call_ID);
274 
275         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
276         if (ret < 0)
277                 return ERR_PTR(ret);
278 
279         lock_sock(&rx->sk);
280 
281         if (!key)
282                 key = rx->key;
283         if (key && !key->payload.data[0])
284                 key = NULL; /* a no-security key */
285 
286         memset(&cp, 0, sizeof(cp));
287         cp.local                = rx->local;
288         cp.key                  = key;
289         cp.security_level       = 0;
290         cp.exclusive            = false;
291         cp.service_id           = srx->srx_service;
292         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
293         /* The socket has been unlocked. */
294         if (!IS_ERR(call))
295                 call->notify_rx = notify_rx;
296 
297         mutex_unlock(&call->user_mutex);
298         _leave(" = %p", call);
299         return call;
300 }
301 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
302 
303 /**
304  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
305  * @sock: The socket the call is on
306  * @call: The call to end
307  *
308  * Allow a kernel service to end a call it was using.  The call must be
309  * complete before this is called (the call should be aborted if necessary).
310  */
311 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
312 {
313         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
314 
315         mutex_lock(&call->user_mutex);
316         rxrpc_release_call(rxrpc_sk(sock->sk), call);
317         mutex_unlock(&call->user_mutex);
318         rxrpc_put_call(call, rxrpc_call_put_kernel);
319 }
320 EXPORT_SYMBOL(rxrpc_kernel_end_call);
321 
322 /**
323  * rxrpc_kernel_new_call_notification - Get notifications of new calls
324  * @sock: The socket to intercept received messages on
325  * @notify_new_call: Function to be called when new calls appear
326  * @discard_new_call: Function to discard preallocated calls
327  *
328  * Allow a kernel service to be given notifications about new calls.
329  */
330 void rxrpc_kernel_new_call_notification(
331         struct socket *sock,
332         rxrpc_notify_new_call_t notify_new_call,
333         rxrpc_discard_new_call_t discard_new_call)
334 {
335         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
336 
337         rx->notify_new_call = notify_new_call;
338         rx->discard_new_call = discard_new_call;
339 }
340 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
341 
342 /*
343  * connect an RxRPC socket
344  * - this just targets it at a specific destination; no actual connection
345  *   negotiation takes place
346  */
347 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
348                          int addr_len, int flags)
349 {
350         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
351         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
352         int ret;
353 
354         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
355 
356         ret = rxrpc_validate_address(rx, srx, addr_len);
357         if (ret < 0) {
358                 _leave(" = %d [bad addr]", ret);
359                 return ret;
360         }
361 
362         lock_sock(&rx->sk);
363 
364         ret = -EISCONN;
365         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
366                 goto error;
367 
368         switch (rx->sk.sk_state) {
369         case RXRPC_UNBOUND:
370                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
371         case RXRPC_CLIENT_UNBOUND:
372         case RXRPC_CLIENT_BOUND:
373                 break;
374         default:
375                 ret = -EBUSY;
376                 goto error;
377         }
378 
379         rx->connect_srx = *srx;
380         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
381         ret = 0;
382 
383 error:
384         release_sock(&rx->sk);
385         return ret;
386 }
387 
388 /*
389  * send a message through an RxRPC socket
390  * - in a client this does a number of things:
391  *   - finds/sets up a connection for the security specified (if any)
392  *   - initiates a call (ID in control data)
393  *   - ends the request phase of a call (if MSG_MORE is not set)
394  *   - sends a call data packet
395  *   - may send an abort (abort code in control data)
396  */
397 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
398 {
399         struct rxrpc_local *local;
400         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
401         int ret;
402 
403         _enter(",{%d},,%zu", rx->sk.sk_state, len);
404 
405         if (m->msg_flags & MSG_OOB)
406                 return -EOPNOTSUPP;
407 
408         if (m->msg_name) {
409                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
410                 if (ret < 0) {
411                         _leave(" = %d [bad addr]", ret);
412                         return ret;
413                 }
414         }
415 
416         lock_sock(&rx->sk);
417 
418         switch (rx->sk.sk_state) {
419         case RXRPC_UNBOUND:
420                 rx->srx.srx_family = AF_RXRPC;
421                 rx->srx.srx_service = 0;
422                 rx->srx.transport_type = SOCK_DGRAM;
423                 rx->srx.transport.family = rx->family;
424                 switch (rx->family) {
425                 case AF_INET:
426                         rx->srx.transport_len = sizeof(struct sockaddr_in);
427                         break;
428 #ifdef CONFIG_AF_RXRPC_IPV6
429                 case AF_INET6:
430                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
431                         break;
432 #endif
433                 default:
434                         ret = -EAFNOSUPPORT;
435                         goto error_unlock;
436                 }
437                 local = rxrpc_lookup_local(&rx->srx);
438                 if (IS_ERR(local)) {
439                         ret = PTR_ERR(local);
440                         goto error_unlock;
441                 }
442 
443                 rx->local = local;
444                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
445                 /* Fall through */
446 
447         case RXRPC_CLIENT_UNBOUND:
448         case RXRPC_CLIENT_BOUND:
449                 if (!m->msg_name &&
450                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
451                         m->msg_name = &rx->connect_srx;
452                         m->msg_namelen = sizeof(rx->connect_srx);
453                 }
454         case RXRPC_SERVER_BOUND:
455         case RXRPC_SERVER_LISTENING:
456                 ret = rxrpc_do_sendmsg(rx, m, len);
457                 /* The socket has been unlocked */
458                 goto out;
459         default:
460                 ret = -EINVAL;
461                 goto error_unlock;
462         }
463 
464 error_unlock:
465         release_sock(&rx->sk);
466 out:
467         _leave(" = %d", ret);
468         return ret;
469 }
470 
471 /*
472  * set RxRPC socket options
473  */
474 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
475                             char __user *optval, unsigned int optlen)
476 {
477         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
478         unsigned int min_sec_level;
479         int ret;
480 
481         _enter(",%d,%d,,%d", level, optname, optlen);
482 
483         lock_sock(&rx->sk);
484         ret = -EOPNOTSUPP;
485 
486         if (level == SOL_RXRPC) {
487                 switch (optname) {
488                 case RXRPC_EXCLUSIVE_CONNECTION:
489                         ret = -EINVAL;
490                         if (optlen != 0)
491                                 goto error;
492                         ret = -EISCONN;
493                         if (rx->sk.sk_state != RXRPC_UNBOUND)
494                                 goto error;
495                         rx->exclusive = true;
496                         goto success;
497 
498                 case RXRPC_SECURITY_KEY:
499                         ret = -EINVAL;
500                         if (rx->key)
501                                 goto error;
502                         ret = -EISCONN;
503                         if (rx->sk.sk_state != RXRPC_UNBOUND)
504                                 goto error;
505                         ret = rxrpc_request_key(rx, optval, optlen);
506                         goto error;
507 
508                 case RXRPC_SECURITY_KEYRING:
509                         ret = -EINVAL;
510                         if (rx->key)
511                                 goto error;
512                         ret = -EISCONN;
513                         if (rx->sk.sk_state != RXRPC_UNBOUND)
514                                 goto error;
515                         ret = rxrpc_server_keyring(rx, optval, optlen);
516                         goto error;
517 
518                 case RXRPC_MIN_SECURITY_LEVEL:
519                         ret = -EINVAL;
520                         if (optlen != sizeof(unsigned int))
521                                 goto error;
522                         ret = -EISCONN;
523                         if (rx->sk.sk_state != RXRPC_UNBOUND)
524                                 goto error;
525                         ret = get_user(min_sec_level,
526                                        (unsigned int __user *) optval);
527                         if (ret < 0)
528                                 goto error;
529                         ret = -EINVAL;
530                         if (min_sec_level > RXRPC_SECURITY_MAX)
531                                 goto error;
532                         rx->min_sec_level = min_sec_level;
533                         goto success;
534 
535                 default:
536                         break;
537                 }
538         }
539 
540 success:
541         ret = 0;
542 error:
543         release_sock(&rx->sk);
544         return ret;
545 }
546 
547 /*
548  * permit an RxRPC socket to be polled
549  */
550 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
551                                poll_table *wait)
552 {
553         struct sock *sk = sock->sk;
554         struct rxrpc_sock *rx = rxrpc_sk(sk);
555         unsigned int mask;
556 
557         sock_poll_wait(file, sk_sleep(sk), wait);
558         mask = 0;
559 
560         /* the socket is readable if there are any messages waiting on the Rx
561          * queue */
562         if (!list_empty(&rx->recvmsg_q))
563                 mask |= POLLIN | POLLRDNORM;
564 
565         /* the socket is writable if there is space to add new data to the
566          * socket; there is no guarantee that any particular call in progress
567          * on the socket may have space in the Tx ACK window */
568         if (rxrpc_writable(sk))
569                 mask |= POLLOUT | POLLWRNORM;
570 
571         return mask;
572 }
573 
574 /*
575  * create an RxRPC socket
576  */
577 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
578                         int kern)
579 {
580         struct rxrpc_sock *rx;
581         struct sock *sk;
582 
583         _enter("%p,%d", sock, protocol);
584 
585         if (!net_eq(net, &init_net))
586                 return -EAFNOSUPPORT;
587 
588         /* we support transport protocol UDP/UDP6 only */
589         if (protocol != PF_INET &&
590             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
591                 return -EPROTONOSUPPORT;
592 
593         if (sock->type != SOCK_DGRAM)
594                 return -ESOCKTNOSUPPORT;
595 
596         sock->ops = &rxrpc_rpc_ops;
597         sock->state = SS_UNCONNECTED;
598 
599         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
600         if (!sk)
601                 return -ENOMEM;
602 
603         sock_init_data(sock, sk);
604         sock_set_flag(sk, SOCK_RCU_FREE);
605         sk->sk_state            = RXRPC_UNBOUND;
606         sk->sk_write_space      = rxrpc_write_space;
607         sk->sk_max_ack_backlog  = 0;
608         sk->sk_destruct         = rxrpc_sock_destructor;
609 
610         rx = rxrpc_sk(sk);
611         rx->family = protocol;
612         rx->calls = RB_ROOT;
613 
614         spin_lock_init(&rx->incoming_lock);
615         INIT_LIST_HEAD(&rx->sock_calls);
616         INIT_LIST_HEAD(&rx->to_be_accepted);
617         INIT_LIST_HEAD(&rx->recvmsg_q);
618         rwlock_init(&rx->recvmsg_lock);
619         rwlock_init(&rx->call_lock);
620         memset(&rx->srx, 0, sizeof(rx->srx));
621 
622         _leave(" = 0 [%p]", rx);
623         return 0;
624 }
625 
626 /*
627  * Kill all the calls on a socket and shut it down.
628  */
629 static int rxrpc_shutdown(struct socket *sock, int flags)
630 {
631         struct sock *sk = sock->sk;
632         struct rxrpc_sock *rx = rxrpc_sk(sk);
633         int ret = 0;
634 
635         _enter("%p,%d", sk, flags);
636 
637         if (flags != SHUT_RDWR)
638                 return -EOPNOTSUPP;
639         if (sk->sk_state == RXRPC_CLOSE)
640                 return -ESHUTDOWN;
641 
642         lock_sock(sk);
643 
644         spin_lock_bh(&sk->sk_receive_queue.lock);
645         if (sk->sk_state < RXRPC_CLOSE) {
646                 sk->sk_state = RXRPC_CLOSE;
647                 sk->sk_shutdown = SHUTDOWN_MASK;
648         } else {
649                 ret = -ESHUTDOWN;
650         }
651         spin_unlock_bh(&sk->sk_receive_queue.lock);
652 
653         rxrpc_discard_prealloc(rx);
654 
655         release_sock(sk);
656         return ret;
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         if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
696                 write_lock(&rx->local->services_lock);
697                 rcu_assign_pointer(rx->local->service, NULL);
698                 write_unlock(&rx->local->services_lock);
699         }
700 
701         /* try to flush out this socket */
702         rxrpc_discard_prealloc(rx);
703         rxrpc_release_calls_on_socket(rx);
704         flush_workqueue(rxrpc_workqueue);
705         rxrpc_purge_queue(&sk->sk_receive_queue);
706 
707         rxrpc_put_local(rx->local);
708         rx->local = NULL;
709         key_put(rx->key);
710         rx->key = NULL;
711         key_put(rx->securities);
712         rx->securities = NULL;
713         sock_put(sk);
714 
715         _leave(" = 0");
716         return 0;
717 }
718 
719 /*
720  * release an RxRPC BSD socket on close() or equivalent
721  */
722 static int rxrpc_release(struct socket *sock)
723 {
724         struct sock *sk = sock->sk;
725 
726         _enter("%p{%p}", sock, sk);
727 
728         if (!sk)
729                 return 0;
730 
731         sock->sk = NULL;
732 
733         return rxrpc_release_sock(sk);
734 }
735 
736 /*
737  * RxRPC network protocol
738  */
739 static const struct proto_ops rxrpc_rpc_ops = {
740         .family         = PF_RXRPC,
741         .owner          = THIS_MODULE,
742         .release        = rxrpc_release,
743         .bind           = rxrpc_bind,
744         .connect        = rxrpc_connect,
745         .socketpair     = sock_no_socketpair,
746         .accept         = sock_no_accept,
747         .getname        = sock_no_getname,
748         .poll           = rxrpc_poll,
749         .ioctl          = sock_no_ioctl,
750         .listen         = rxrpc_listen,
751         .shutdown       = rxrpc_shutdown,
752         .setsockopt     = rxrpc_setsockopt,
753         .getsockopt     = sock_no_getsockopt,
754         .sendmsg        = rxrpc_sendmsg,
755         .recvmsg        = rxrpc_recvmsg,
756         .mmap           = sock_no_mmap,
757         .sendpage       = sock_no_sendpage,
758 };
759 
760 static struct proto rxrpc_proto = {
761         .name           = "RXRPC",
762         .owner          = THIS_MODULE,
763         .obj_size       = sizeof(struct rxrpc_sock),
764         .max_header     = sizeof(struct rxrpc_wire_header),
765 };
766 
767 static const struct net_proto_family rxrpc_family_ops = {
768         .family = PF_RXRPC,
769         .create = rxrpc_create,
770         .owner  = THIS_MODULE,
771 };
772 
773 /*
774  * initialise and register the RxRPC protocol
775  */
776 static int __init af_rxrpc_init(void)
777 {
778         int ret = -1;
779         unsigned int tmp;
780 
781         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
782 
783         get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
784         rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
785         get_random_bytes(&tmp, sizeof(tmp));
786         tmp &= 0x3fffffff;
787         if (tmp == 0)
788                 tmp = 1;
789         idr_set_cursor(&rxrpc_client_conn_ids, tmp);
790 
791         ret = -ENOMEM;
792         rxrpc_call_jar = kmem_cache_create(
793                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
794                 SLAB_HWCACHE_ALIGN, NULL);
795         if (!rxrpc_call_jar) {
796                 pr_notice("Failed to allocate call jar\n");
797                 goto error_call_jar;
798         }
799 
800         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
801         if (!rxrpc_workqueue) {
802                 pr_notice("Failed to allocate work queue\n");
803                 goto error_work_queue;
804         }
805 
806         ret = rxrpc_init_security();
807         if (ret < 0) {
808                 pr_crit("Cannot initialise security\n");
809                 goto error_security;
810         }
811 
812         ret = proto_register(&rxrpc_proto, 1);
813         if (ret < 0) {
814                 pr_crit("Cannot register protocol\n");
815                 goto error_proto;
816         }
817 
818         ret = sock_register(&rxrpc_family_ops);
819         if (ret < 0) {
820                 pr_crit("Cannot register socket family\n");
821                 goto error_sock;
822         }
823 
824         ret = register_key_type(&key_type_rxrpc);
825         if (ret < 0) {
826                 pr_crit("Cannot register client key type\n");
827                 goto error_key_type;
828         }
829 
830         ret = register_key_type(&key_type_rxrpc_s);
831         if (ret < 0) {
832                 pr_crit("Cannot register server key type\n");
833                 goto error_key_type_s;
834         }
835 
836         ret = rxrpc_sysctl_init();
837         if (ret < 0) {
838                 pr_crit("Cannot register sysctls\n");
839                 goto error_sysctls;
840         }
841 
842 #ifdef CONFIG_PROC_FS
843         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
844         proc_create("rxrpc_conns", 0, init_net.proc_net,
845                     &rxrpc_connection_seq_fops);
846 #endif
847         return 0;
848 
849 error_sysctls:
850         unregister_key_type(&key_type_rxrpc_s);
851 error_key_type_s:
852         unregister_key_type(&key_type_rxrpc);
853 error_key_type:
854         sock_unregister(PF_RXRPC);
855 error_sock:
856         proto_unregister(&rxrpc_proto);
857 error_proto:
858         rxrpc_exit_security();
859 error_security:
860         destroy_workqueue(rxrpc_workqueue);
861 error_work_queue:
862         kmem_cache_destroy(rxrpc_call_jar);
863 error_call_jar:
864         return ret;
865 }
866 
867 /*
868  * unregister the RxRPC protocol
869  */
870 static void __exit af_rxrpc_exit(void)
871 {
872         _enter("");
873         rxrpc_sysctl_exit();
874         unregister_key_type(&key_type_rxrpc_s);
875         unregister_key_type(&key_type_rxrpc);
876         sock_unregister(PF_RXRPC);
877         proto_unregister(&rxrpc_proto);
878         rxrpc_destroy_all_calls();
879         rxrpc_destroy_all_connections();
880         ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
881         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
882         rxrpc_destroy_all_locals();
883 
884         remove_proc_entry("rxrpc_conns", init_net.proc_net);
885         remove_proc_entry("rxrpc_calls", init_net.proc_net);
886         destroy_workqueue(rxrpc_workqueue);
887         rxrpc_exit_security();
888         kmem_cache_destroy(rxrpc_call_jar);
889         _leave("");
890 }
891 
892 module_init(af_rxrpc_init);
893 module_exit(af_rxrpc_exit);
894 

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