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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 #include <linux/module.h>
 13 #include <linux/kernel.h>
 14 #include <linux/net.h>
 15 #include <linux/slab.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/poll.h>
 18 #include <linux/proc_fs.h>
 19 #include <linux/key-type.h>
 20 #include <net/net_namespace.h>
 21 #include <net/sock.h>
 22 #include <net/af_rxrpc.h>
 23 #include "ar-internal.h"
 24 
 25 MODULE_DESCRIPTION("RxRPC network protocol");
 26 MODULE_AUTHOR("Red Hat, Inc.");
 27 MODULE_LICENSE("GPL");
 28 MODULE_ALIAS_NETPROTO(PF_RXRPC);
 29 
 30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
 31 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
 32 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
 33 
 34 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
 35 
 36 static struct proto rxrpc_proto;
 37 static const struct proto_ops rxrpc_rpc_ops;
 38 
 39 /* local epoch for detecting local-end reset */
 40 u32 rxrpc_epoch;
 41 
 42 /* current debugging ID */
 43 atomic_t rxrpc_debug_id;
 44 
 45 /* count of skbs currently in use */
 46 atomic_t rxrpc_n_skbs;
 47 
 48 struct workqueue_struct *rxrpc_workqueue;
 49 
 50 static void rxrpc_sock_destructor(struct sock *);
 51 
 52 /*
 53  * see if an RxRPC socket is currently writable
 54  */
 55 static inline int rxrpc_writable(struct sock *sk)
 56 {
 57         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
 58 }
 59 
 60 /*
 61  * wait for write bufferage to become available
 62  */
 63 static void rxrpc_write_space(struct sock *sk)
 64 {
 65         _enter("%p", sk);
 66         rcu_read_lock();
 67         if (rxrpc_writable(sk)) {
 68                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
 69 
 70                 if (skwq_has_sleeper(wq))
 71                         wake_up_interruptible(&wq->wait);
 72                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 73         }
 74         rcu_read_unlock();
 75 }
 76 
 77 /*
 78  * validate an RxRPC address
 79  */
 80 static int rxrpc_validate_address(struct rxrpc_sock *rx,
 81                                   struct sockaddr_rxrpc *srx,
 82                                   int len)
 83 {
 84         unsigned int tail;
 85 
 86         if (len < sizeof(struct sockaddr_rxrpc))
 87                 return -EINVAL;
 88 
 89         if (srx->srx_family != AF_RXRPC)
 90                 return -EAFNOSUPPORT;
 91 
 92         if (srx->transport_type != SOCK_DGRAM)
 93                 return -ESOCKTNOSUPPORT;
 94 
 95         len -= offsetof(struct sockaddr_rxrpc, transport);
 96         if (srx->transport_len < sizeof(sa_family_t) ||
 97             srx->transport_len > len)
 98                 return -EINVAL;
 99 
100         if (srx->transport.family != rx->proto)
101                 return -EAFNOSUPPORT;
102 
103         switch (srx->transport.family) {
104         case AF_INET:
105                 _debug("INET: %x @ %pI4",
106                        ntohs(srx->transport.sin.sin_port),
107                        &srx->transport.sin.sin_addr);
108                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
109                 break;
110 
111         case AF_INET6:
112         default:
113                 return -EAFNOSUPPORT;
114         }
115 
116         if (tail < len)
117                 memset((void *)srx + tail, 0, len - tail);
118         return 0;
119 }
120 
121 /*
122  * bind a local address to an RxRPC socket
123  */
124 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
125 {
126         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
127         struct sock *sk = sock->sk;
128         struct rxrpc_local *local;
129         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
130         int ret;
131 
132         _enter("%p,%p,%d", rx, saddr, len);
133 
134         ret = rxrpc_validate_address(rx, srx, len);
135         if (ret < 0)
136                 goto error;
137 
138         lock_sock(&rx->sk);
139 
140         if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
141                 ret = -EINVAL;
142                 goto error_unlock;
143         }
144 
145         memcpy(&rx->srx, srx, sizeof(rx->srx));
146 
147         /* Find or create a local transport endpoint to use */
148         local = rxrpc_lookup_local(&rx->srx);
149         if (IS_ERR(local)) {
150                 ret = PTR_ERR(local);
151                 goto error_unlock;
152         }
153 
154         rx->local = local;
155         if (srx->srx_service) {
156                 write_lock_bh(&local->services_lock);
157                 list_for_each_entry(prx, &local->services, listen_link) {
158                         if (prx->srx.srx_service == srx->srx_service)
159                                 goto service_in_use;
160                 }
161 
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 
279         _enter(",,%x,%lx", key_serial(key), user_call_ID);
280 
281         lock_sock(&rx->sk);
282 
283         if (srx) {
284                 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
285                                                 sizeof(*srx), 0, gfp);
286                 if (IS_ERR(trans)) {
287                         call = ERR_CAST(trans);
288                         trans = NULL;
289                         goto out_notrans;
290                 }
291         } else {
292                 trans = rx->trans;
293                 if (!trans) {
294                         call = ERR_PTR(-ENOTCONN);
295                         goto out_notrans;
296                 }
297                 atomic_inc(&trans->usage);
298         }
299 
300         if (!srx)
301                 srx = &rx->srx;
302         if (!key)
303                 key = rx->key;
304         if (key && !key->payload.data[0])
305                 key = NULL; /* a no-security key */
306 
307         bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, 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 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
324 
325 /**
326  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
327  * @call: The call to end
328  *
329  * Allow a kernel service to end a call it was using.  The call must be
330  * complete before this is called (the call should be aborted if necessary).
331  */
332 void rxrpc_kernel_end_call(struct rxrpc_call *call)
333 {
334         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
335         rxrpc_remove_user_ID(call->socket, call);
336         rxrpc_put_call(call);
337 }
338 EXPORT_SYMBOL(rxrpc_kernel_end_call);
339 
340 /**
341  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
342  * @sock: The socket to intercept received messages on
343  * @interceptor: The function to pass the messages to
344  *
345  * Allow a kernel service to intercept messages heading for the Rx queue on an
346  * RxRPC socket.  They get passed to the specified function instead.
347  * @interceptor should free the socket buffers it is given.  @interceptor is
348  * called with the socket receive queue spinlock held and softirqs disabled -
349  * this ensures that the messages will be delivered in the right order.
350  */
351 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
352                                         rxrpc_interceptor_t interceptor)
353 {
354         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
355 
356         _enter("");
357         rx->interceptor = interceptor;
358 }
359 
360 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
361 
362 /*
363  * connect an RxRPC socket
364  * - this just targets it at a specific destination; no actual connection
365  *   negotiation takes place
366  */
367 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
368                          int addr_len, int flags)
369 {
370         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
371         struct sock *sk = sock->sk;
372         struct rxrpc_transport *trans;
373         struct rxrpc_local *local;
374         struct rxrpc_sock *rx = rxrpc_sk(sk);
375         int ret;
376 
377         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
378 
379         ret = rxrpc_validate_address(rx, srx, addr_len);
380         if (ret < 0) {
381                 _leave(" = %d [bad addr]", ret);
382                 return ret;
383         }
384 
385         lock_sock(&rx->sk);
386 
387         switch (rx->sk.sk_state) {
388         case RXRPC_UNCONNECTED:
389                 /* find a local transport endpoint if we don't have one already */
390                 ASSERTCMP(rx->local, ==, NULL);
391                 rx->srx.srx_family = AF_RXRPC;
392                 rx->srx.srx_service = 0;
393                 rx->srx.transport_type = srx->transport_type;
394                 rx->srx.transport_len = sizeof(sa_family_t);
395                 rx->srx.transport.family = srx->transport.family;
396                 local = rxrpc_lookup_local(&rx->srx);
397                 if (IS_ERR(local)) {
398                         release_sock(&rx->sk);
399                         return PTR_ERR(local);
400                 }
401                 rx->local = local;
402                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
403         case RXRPC_CLIENT_BOUND:
404                 break;
405         case RXRPC_CLIENT_CONNECTED:
406                 release_sock(&rx->sk);
407                 return -EISCONN;
408         default:
409                 release_sock(&rx->sk);
410                 return -EBUSY; /* server sockets can't connect as well */
411         }
412 
413         trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
414                                         GFP_KERNEL);
415         if (IS_ERR(trans)) {
416                 release_sock(&rx->sk);
417                 _leave(" = %ld", PTR_ERR(trans));
418                 return PTR_ERR(trans);
419         }
420 
421         rx->trans = trans;
422         rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
423 
424         release_sock(&rx->sk);
425         return 0;
426 }
427 
428 /*
429  * send a message through an RxRPC socket
430  * - in a client this does a number of things:
431  *   - finds/sets up a connection for the security specified (if any)
432  *   - initiates a call (ID in control data)
433  *   - ends the request phase of a call (if MSG_MORE is not set)
434  *   - sends a call data packet
435  *   - may send an abort (abort code in control data)
436  */
437 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
438 {
439         struct rxrpc_transport *trans;
440         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
441         int ret;
442 
443         _enter(",{%d},,%zu", rx->sk.sk_state, len);
444 
445         if (m->msg_flags & MSG_OOB)
446                 return -EOPNOTSUPP;
447 
448         if (m->msg_name) {
449                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
450                 if (ret < 0) {
451                         _leave(" = %d [bad addr]", ret);
452                         return ret;
453                 }
454         }
455 
456         trans = NULL;
457         lock_sock(&rx->sk);
458 
459         if (m->msg_name) {
460                 ret = -EISCONN;
461                 trans = rxrpc_name_to_transport(sock, m->msg_name,
462                                                 m->msg_namelen, 0, GFP_KERNEL);
463                 if (IS_ERR(trans)) {
464                         ret = PTR_ERR(trans);
465                         trans = NULL;
466                         goto out;
467                 }
468         } else {
469                 trans = rx->trans;
470                 if (trans)
471                         atomic_inc(&trans->usage);
472         }
473 
474         switch (rx->sk.sk_state) {
475         case RXRPC_SERVER_LISTENING:
476                 if (!m->msg_name) {
477                         ret = rxrpc_server_sendmsg(rx, m, len);
478                         break;
479                 }
480         case RXRPC_SERVER_BOUND:
481         case RXRPC_CLIENT_BOUND:
482                 if (!m->msg_name) {
483                         ret = -ENOTCONN;
484                         break;
485                 }
486         case RXRPC_CLIENT_CONNECTED:
487                 ret = rxrpc_client_sendmsg(rx, trans, m, len);
488                 break;
489         default:
490                 ret = -ENOTCONN;
491                 break;
492         }
493 
494 out:
495         release_sock(&rx->sk);
496         if (trans)
497                 rxrpc_put_transport(trans);
498         _leave(" = %d", ret);
499         return ret;
500 }
501 
502 /*
503  * set RxRPC socket options
504  */
505 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
506                             char __user *optval, unsigned int optlen)
507 {
508         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
509         unsigned int min_sec_level;
510         int ret;
511 
512         _enter(",%d,%d,,%d", level, optname, optlen);
513 
514         lock_sock(&rx->sk);
515         ret = -EOPNOTSUPP;
516 
517         if (level == SOL_RXRPC) {
518                 switch (optname) {
519                 case RXRPC_EXCLUSIVE_CONNECTION:
520                         ret = -EINVAL;
521                         if (optlen != 0)
522                                 goto error;
523                         ret = -EISCONN;
524                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
525                                 goto error;
526                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
527                         goto success;
528 
529                 case RXRPC_SECURITY_KEY:
530                         ret = -EINVAL;
531                         if (rx->key)
532                                 goto error;
533                         ret = -EISCONN;
534                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
535                                 goto error;
536                         ret = rxrpc_request_key(rx, optval, optlen);
537                         goto error;
538 
539                 case RXRPC_SECURITY_KEYRING:
540                         ret = -EINVAL;
541                         if (rx->key)
542                                 goto error;
543                         ret = -EISCONN;
544                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
545                                 goto error;
546                         ret = rxrpc_server_keyring(rx, optval, optlen);
547                         goto error;
548 
549                 case RXRPC_MIN_SECURITY_LEVEL:
550                         ret = -EINVAL;
551                         if (optlen != sizeof(unsigned int))
552                                 goto error;
553                         ret = -EISCONN;
554                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
555                                 goto error;
556                         ret = get_user(min_sec_level,
557                                        (unsigned int __user *) optval);
558                         if (ret < 0)
559                                 goto error;
560                         ret = -EINVAL;
561                         if (min_sec_level > RXRPC_SECURITY_MAX)
562                                 goto error;
563                         rx->min_sec_level = min_sec_level;
564                         goto success;
565 
566                 default:
567                         break;
568                 }
569         }
570 
571 success:
572         ret = 0;
573 error:
574         release_sock(&rx->sk);
575         return ret;
576 }
577 
578 /*
579  * permit an RxRPC socket to be polled
580  */
581 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
582                                poll_table *wait)
583 {
584         unsigned int mask;
585         struct sock *sk = sock->sk;
586 
587         sock_poll_wait(file, sk_sleep(sk), wait);
588         mask = 0;
589 
590         /* the socket is readable if there are any messages waiting on the Rx
591          * queue */
592         if (!skb_queue_empty(&sk->sk_receive_queue))
593                 mask |= POLLIN | POLLRDNORM;
594 
595         /* the socket is writable if there is space to add new data to the
596          * socket; there is no guarantee that any particular call in progress
597          * on the socket may have space in the Tx ACK window */
598         if (rxrpc_writable(sk))
599                 mask |= POLLOUT | POLLWRNORM;
600 
601         return mask;
602 }
603 
604 /*
605  * create an RxRPC socket
606  */
607 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
608                         int kern)
609 {
610         struct rxrpc_sock *rx;
611         struct sock *sk;
612 
613         _enter("%p,%d", sock, protocol);
614 
615         if (!net_eq(net, &init_net))
616                 return -EAFNOSUPPORT;
617 
618         /* we support transport protocol UDP/UDP6 only */
619         if (protocol != PF_INET)
620                 return -EPROTONOSUPPORT;
621 
622         if (sock->type != SOCK_DGRAM)
623                 return -ESOCKTNOSUPPORT;
624 
625         sock->ops = &rxrpc_rpc_ops;
626         sock->state = SS_UNCONNECTED;
627 
628         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
629         if (!sk)
630                 return -ENOMEM;
631 
632         sock_init_data(sock, sk);
633         sk->sk_state            = RXRPC_UNCONNECTED;
634         sk->sk_write_space      = rxrpc_write_space;
635         sk->sk_max_ack_backlog  = sysctl_rxrpc_max_qlen;
636         sk->sk_destruct         = rxrpc_sock_destructor;
637 
638         rx = rxrpc_sk(sk);
639         rx->proto = protocol;
640         rx->calls = RB_ROOT;
641 
642         INIT_LIST_HEAD(&rx->listen_link);
643         INIT_LIST_HEAD(&rx->secureq);
644         INIT_LIST_HEAD(&rx->acceptq);
645         rwlock_init(&rx->call_lock);
646         memset(&rx->srx, 0, sizeof(rx->srx));
647 
648         _leave(" = 0 [%p]", rx);
649         return 0;
650 }
651 
652 /*
653  * RxRPC socket destructor
654  */
655 static void rxrpc_sock_destructor(struct sock *sk)
656 {
657         _enter("%p", sk);
658 
659         rxrpc_purge_queue(&sk->sk_receive_queue);
660 
661         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
662         WARN_ON(!sk_unhashed(sk));
663         WARN_ON(sk->sk_socket);
664 
665         if (!sock_flag(sk, SOCK_DEAD)) {
666                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
667                 return;
668         }
669 }
670 
671 /*
672  * release an RxRPC socket
673  */
674 static int rxrpc_release_sock(struct sock *sk)
675 {
676         struct rxrpc_sock *rx = rxrpc_sk(sk);
677 
678         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
679 
680         /* declare the socket closed for business */
681         sock_orphan(sk);
682         sk->sk_shutdown = SHUTDOWN_MASK;
683 
684         spin_lock_bh(&sk->sk_receive_queue.lock);
685         sk->sk_state = RXRPC_CLOSE;
686         spin_unlock_bh(&sk->sk_receive_queue.lock);
687 
688         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
689 
690         if (!list_empty(&rx->listen_link)) {
691                 write_lock_bh(&rx->local->services_lock);
692                 list_del(&rx->listen_link);
693                 write_unlock_bh(&rx->local->services_lock);
694         }
695 
696         /* try to flush out this socket */
697         rxrpc_release_calls_on_socket(rx);
698         flush_workqueue(rxrpc_workqueue);
699         rxrpc_purge_queue(&sk->sk_receive_queue);
700 
701         if (rx->conn) {
702                 rxrpc_put_connection(rx->conn);
703                 rx->conn = NULL;
704         }
705 
706         if (rx->bundle) {
707                 rxrpc_put_bundle(rx->trans, rx->bundle);
708                 rx->bundle = NULL;
709         }
710         if (rx->trans) {
711                 rxrpc_put_transport(rx->trans);
712                 rx->trans = NULL;
713         }
714         if (rx->local) {
715                 rxrpc_put_local(rx->local);
716                 rx->local = NULL;
717         }
718 
719         key_put(rx->key);
720         rx->key = NULL;
721         key_put(rx->securities);
722         rx->securities = NULL;
723         sock_put(sk);
724 
725         _leave(" = 0");
726         return 0;
727 }
728 
729 /*
730  * release an RxRPC BSD socket on close() or equivalent
731  */
732 static int rxrpc_release(struct socket *sock)
733 {
734         struct sock *sk = sock->sk;
735 
736         _enter("%p{%p}", sock, sk);
737 
738         if (!sk)
739                 return 0;
740 
741         sock->sk = NULL;
742 
743         return rxrpc_release_sock(sk);
744 }
745 
746 /*
747  * RxRPC network protocol
748  */
749 static const struct proto_ops rxrpc_rpc_ops = {
750         .family         = PF_RXRPC,
751         .owner          = THIS_MODULE,
752         .release        = rxrpc_release,
753         .bind           = rxrpc_bind,
754         .connect        = rxrpc_connect,
755         .socketpair     = sock_no_socketpair,
756         .accept         = sock_no_accept,
757         .getname        = sock_no_getname,
758         .poll           = rxrpc_poll,
759         .ioctl          = sock_no_ioctl,
760         .listen         = rxrpc_listen,
761         .shutdown       = sock_no_shutdown,
762         .setsockopt     = rxrpc_setsockopt,
763         .getsockopt     = sock_no_getsockopt,
764         .sendmsg        = rxrpc_sendmsg,
765         .recvmsg        = rxrpc_recvmsg,
766         .mmap           = sock_no_mmap,
767         .sendpage       = sock_no_sendpage,
768 };
769 
770 static struct proto rxrpc_proto = {
771         .name           = "RXRPC",
772         .owner          = THIS_MODULE,
773         .obj_size       = sizeof(struct rxrpc_sock),
774         .max_header     = sizeof(struct rxrpc_wire_header),
775 };
776 
777 static const struct net_proto_family rxrpc_family_ops = {
778         .family = PF_RXRPC,
779         .create = rxrpc_create,
780         .owner  = THIS_MODULE,
781 };
782 
783 /*
784  * initialise and register the RxRPC protocol
785  */
786 static int __init af_rxrpc_init(void)
787 {
788         int ret = -1;
789 
790         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
791 
792         rxrpc_epoch = get_seconds();
793 
794         ret = -ENOMEM;
795         rxrpc_call_jar = kmem_cache_create(
796                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
797                 SLAB_HWCACHE_ALIGN, NULL);
798         if (!rxrpc_call_jar) {
799                 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
800                 goto error_call_jar;
801         }
802 
803         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
804         if (!rxrpc_workqueue) {
805                 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
806                 goto error_work_queue;
807         }
808 
809         ret = proto_register(&rxrpc_proto, 1);
810         if (ret < 0) {
811                 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
812                 goto error_proto;
813         }
814 
815         ret = sock_register(&rxrpc_family_ops);
816         if (ret < 0) {
817                 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
818                 goto error_sock;
819         }
820 
821         ret = register_key_type(&key_type_rxrpc);
822         if (ret < 0) {
823                 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
824                 goto error_key_type;
825         }
826 
827         ret = register_key_type(&key_type_rxrpc_s);
828         if (ret < 0) {
829                 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
830                 goto error_key_type_s;
831         }
832 
833         ret = rxrpc_sysctl_init();
834         if (ret < 0) {
835                 printk(KERN_CRIT "RxRPC: Cannot register sysctls\n");
836                 goto error_sysctls;
837         }
838 
839 #ifdef CONFIG_PROC_FS
840         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
841         proc_create("rxrpc_conns", 0, init_net.proc_net,
842                     &rxrpc_connection_seq_fops);
843 #endif
844         return 0;
845 
846 error_sysctls:
847         unregister_key_type(&key_type_rxrpc_s);
848 error_key_type_s:
849         unregister_key_type(&key_type_rxrpc);
850 error_key_type:
851         sock_unregister(PF_RXRPC);
852 error_sock:
853         proto_unregister(&rxrpc_proto);
854 error_proto:
855         destroy_workqueue(rxrpc_workqueue);
856 error_work_queue:
857         kmem_cache_destroy(rxrpc_call_jar);
858 error_call_jar:
859         return ret;
860 }
861 
862 /*
863  * unregister the RxRPC protocol
864  */
865 static void __exit af_rxrpc_exit(void)
866 {
867         _enter("");
868         rxrpc_sysctl_exit();
869         unregister_key_type(&key_type_rxrpc_s);
870         unregister_key_type(&key_type_rxrpc);
871         sock_unregister(PF_RXRPC);
872         proto_unregister(&rxrpc_proto);
873         rxrpc_destroy_all_calls();
874         rxrpc_destroy_all_connections();
875         rxrpc_destroy_all_transports();
876         rxrpc_destroy_all_peers();
877         rxrpc_destroy_all_locals();
878 
879         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
880 
881         _debug("flush scheduled work");
882         flush_workqueue(rxrpc_workqueue);
883         remove_proc_entry("rxrpc_conns", init_net.proc_net);
884         remove_proc_entry("rxrpc_calls", init_net.proc_net);
885         destroy_workqueue(rxrpc_workqueue);
886         kmem_cache_destroy(rxrpc_call_jar);
887         _leave("");
888 }
889 
890 module_init(af_rxrpc_init);
891 module_exit(af_rxrpc_exit);
892 

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