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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 __be32 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 (wq_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         if (len < sizeof(struct sockaddr_rxrpc))
 85                 return -EINVAL;
 86 
 87         if (srx->srx_family != AF_RXRPC)
 88                 return -EAFNOSUPPORT;
 89 
 90         if (srx->transport_type != SOCK_DGRAM)
 91                 return -ESOCKTNOSUPPORT;
 92 
 93         len -= offsetof(struct sockaddr_rxrpc, transport);
 94         if (srx->transport_len < sizeof(sa_family_t) ||
 95             srx->transport_len > len)
 96                 return -EINVAL;
 97 
 98         if (srx->transport.family != rx->proto)
 99                 return -EAFNOSUPPORT;
100 
101         switch (srx->transport.family) {
102         case AF_INET:
103                 _debug("INET: %x @ %pI4",
104                        ntohs(srx->transport.sin.sin_port),
105                        &srx->transport.sin.sin_addr);
106                 if (srx->transport_len > 8)
107                         memset((void *)&srx->transport + 8, 0,
108                                srx->transport_len - 8);
109                 break;
110 
111         case AF_INET6:
112         default:
113                 return -EAFNOSUPPORT;
114         }
115 
116         return 0;
117 }
118 
119 /*
120  * bind a local address to an RxRPC socket
121  */
122 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
123 {
124         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
125         struct sock *sk = sock->sk;
126         struct rxrpc_local *local;
127         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
128         __be16 service_id;
129         int ret;
130 
131         _enter("%p,%p,%d", rx, saddr, len);
132 
133         ret = rxrpc_validate_address(rx, srx, len);
134         if (ret < 0)
135                 goto error;
136 
137         lock_sock(&rx->sk);
138 
139         if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
140                 ret = -EINVAL;
141                 goto error_unlock;
142         }
143 
144         memcpy(&rx->srx, srx, sizeof(rx->srx));
145 
146         /* find a local transport endpoint if we don't have one already */
147         local = rxrpc_lookup_local(&rx->srx);
148         if (IS_ERR(local)) {
149                 ret = PTR_ERR(local);
150                 goto error_unlock;
151         }
152 
153         rx->local = local;
154         if (srx->srx_service) {
155                 service_id = htons(srx->srx_service);
156                 write_lock_bh(&local->services_lock);
157                 list_for_each_entry(prx, &local->services, listen_link) {
158                         if (prx->service_id == service_id)
159                                 goto service_in_use;
160                 }
161 
162                 rx->service_id = service_id;
163                 list_add_tail(&rx->listen_link, &local->services);
164                 write_unlock_bh(&local->services_lock);
165 
166                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
167         } else {
168                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
169         }
170 
171         release_sock(&rx->sk);
172         _leave(" = 0");
173         return 0;
174 
175 service_in_use:
176         ret = -EADDRINUSE;
177         write_unlock_bh(&local->services_lock);
178 error_unlock:
179         release_sock(&rx->sk);
180 error:
181         _leave(" = %d", ret);
182         return ret;
183 }
184 
185 /*
186  * set the number of pending calls permitted on a listening socket
187  */
188 static int rxrpc_listen(struct socket *sock, int backlog)
189 {
190         struct sock *sk = sock->sk;
191         struct rxrpc_sock *rx = rxrpc_sk(sk);
192         int ret;
193 
194         _enter("%p,%d", rx, backlog);
195 
196         lock_sock(&rx->sk);
197 
198         switch (rx->sk.sk_state) {
199         case RXRPC_UNCONNECTED:
200                 ret = -EADDRNOTAVAIL;
201                 break;
202         case RXRPC_CLIENT_BOUND:
203         case RXRPC_CLIENT_CONNECTED:
204         default:
205                 ret = -EBUSY;
206                 break;
207         case RXRPC_SERVER_BOUND:
208                 ASSERT(rx->local != NULL);
209                 sk->sk_max_ack_backlog = backlog;
210                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
211                 ret = 0;
212                 break;
213         }
214 
215         release_sock(&rx->sk);
216         _leave(" = %d", ret);
217         return ret;
218 }
219 
220 /*
221  * find a transport by address
222  */
223 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
224                                                        struct sockaddr *addr,
225                                                        int addr_len, int flags,
226                                                        gfp_t gfp)
227 {
228         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
229         struct rxrpc_transport *trans;
230         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
231         struct rxrpc_peer *peer;
232 
233         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
234 
235         ASSERT(rx->local != NULL);
236         ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
237 
238         if (rx->srx.transport_type != srx->transport_type)
239                 return ERR_PTR(-ESOCKTNOSUPPORT);
240         if (rx->srx.transport.family != srx->transport.family)
241                 return ERR_PTR(-EAFNOSUPPORT);
242 
243         /* find a remote transport endpoint from the local one */
244         peer = rxrpc_get_peer(srx, gfp);
245         if (IS_ERR(peer))
246                 return ERR_CAST(peer);
247 
248         /* find a transport */
249         trans = rxrpc_get_transport(rx->local, peer, gfp);
250         rxrpc_put_peer(peer);
251         _leave(" = %p", trans);
252         return trans;
253 }
254 
255 /**
256  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
257  * @sock: The socket on which to make the call
258  * @srx: The address of the peer to contact (defaults to socket setting)
259  * @key: The security context to use (defaults to socket setting)
260  * @user_call_ID: The ID to use
261  *
262  * Allow a kernel service to begin a call on the nominated socket.  This just
263  * sets up all the internal tracking structures and allocates connection and
264  * call IDs as appropriate.  The call to be used is returned.
265  *
266  * The default socket destination address and security may be overridden by
267  * supplying @srx and @key.
268  */
269 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
270                                            struct sockaddr_rxrpc *srx,
271                                            struct key *key,
272                                            unsigned long user_call_ID,
273                                            gfp_t gfp)
274 {
275         struct rxrpc_conn_bundle *bundle;
276         struct rxrpc_transport *trans;
277         struct rxrpc_call *call;
278         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
279         __be16 service_id;
280 
281         _enter(",,%x,%lx", key_serial(key), user_call_ID);
282 
283         lock_sock(&rx->sk);
284 
285         if (srx) {
286                 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
287                                                 sizeof(*srx), 0, gfp);
288                 if (IS_ERR(trans)) {
289                         call = ERR_CAST(trans);
290                         trans = NULL;
291                         goto out_notrans;
292                 }
293         } else {
294                 trans = rx->trans;
295                 if (!trans) {
296                         call = ERR_PTR(-ENOTCONN);
297                         goto out_notrans;
298                 }
299                 atomic_inc(&trans->usage);
300         }
301 
302         service_id = rx->service_id;
303         if (srx)
304                 service_id = htons(srx->srx_service);
305 
306         if (!key)
307                 key = rx->key;
308         if (key && !key->payload.data)
309                 key = NULL; /* a no-security key */
310 
311         bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
312         if (IS_ERR(bundle)) {
313                 call = ERR_CAST(bundle);
314                 goto out;
315         }
316 
317         call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
318                                      gfp);
319         rxrpc_put_bundle(trans, bundle);
320 out:
321         rxrpc_put_transport(trans);
322 out_notrans:
323         release_sock(&rx->sk);
324         _leave(" = %p", call);
325         return call;
326 }
327 
328 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
329 
330 /**
331  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
332  * @call: The call to end
333  *
334  * Allow a kernel service to end a call it was using.  The call must be
335  * complete before this is called (the call should be aborted if necessary).
336  */
337 void rxrpc_kernel_end_call(struct rxrpc_call *call)
338 {
339         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
340         rxrpc_remove_user_ID(call->socket, call);
341         rxrpc_put_call(call);
342 }
343 
344 EXPORT_SYMBOL(rxrpc_kernel_end_call);
345 
346 /**
347  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
348  * @sock: The socket to intercept received messages on
349  * @interceptor: The function to pass the messages to
350  *
351  * Allow a kernel service to intercept messages heading for the Rx queue on an
352  * RxRPC socket.  They get passed to the specified function instead.
353  * @interceptor should free the socket buffers it is given.  @interceptor is
354  * called with the socket receive queue spinlock held and softirqs disabled -
355  * this ensures that the messages will be delivered in the right order.
356  */
357 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
358                                         rxrpc_interceptor_t interceptor)
359 {
360         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
361 
362         _enter("");
363         rx->interceptor = interceptor;
364 }
365 
366 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
367 
368 /*
369  * connect an RxRPC socket
370  * - this just targets it at a specific destination; no actual connection
371  *   negotiation takes place
372  */
373 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
374                          int addr_len, int flags)
375 {
376         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
377         struct sock *sk = sock->sk;
378         struct rxrpc_transport *trans;
379         struct rxrpc_local *local;
380         struct rxrpc_sock *rx = rxrpc_sk(sk);
381         int ret;
382 
383         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
384 
385         ret = rxrpc_validate_address(rx, srx, addr_len);
386         if (ret < 0) {
387                 _leave(" = %d [bad addr]", ret);
388                 return ret;
389         }
390 
391         lock_sock(&rx->sk);
392 
393         switch (rx->sk.sk_state) {
394         case RXRPC_UNCONNECTED:
395                 /* find a local transport endpoint if we don't have one already */
396                 ASSERTCMP(rx->local, ==, NULL);
397                 rx->srx.srx_family = AF_RXRPC;
398                 rx->srx.srx_service = 0;
399                 rx->srx.transport_type = srx->transport_type;
400                 rx->srx.transport_len = sizeof(sa_family_t);
401                 rx->srx.transport.family = srx->transport.family;
402                 local = rxrpc_lookup_local(&rx->srx);
403                 if (IS_ERR(local)) {
404                         release_sock(&rx->sk);
405                         return PTR_ERR(local);
406                 }
407                 rx->local = local;
408                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
409         case RXRPC_CLIENT_BOUND:
410                 break;
411         case RXRPC_CLIENT_CONNECTED:
412                 release_sock(&rx->sk);
413                 return -EISCONN;
414         default:
415                 release_sock(&rx->sk);
416                 return -EBUSY; /* server sockets can't connect as well */
417         }
418 
419         trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
420                                         GFP_KERNEL);
421         if (IS_ERR(trans)) {
422                 release_sock(&rx->sk);
423                 _leave(" = %ld", PTR_ERR(trans));
424                 return PTR_ERR(trans);
425         }
426 
427         rx->trans = trans;
428         rx->service_id = htons(srx->srx_service);
429         rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
430 
431         release_sock(&rx->sk);
432         return 0;
433 }
434 
435 /*
436  * send a message through an RxRPC socket
437  * - in a client this does a number of things:
438  *   - finds/sets up a connection for the security specified (if any)
439  *   - initiates a call (ID in control data)
440  *   - ends the request phase of a call (if MSG_MORE is not set)
441  *   - sends a call data packet
442  *   - may send an abort (abort code in control data)
443  */
444 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
445                          struct msghdr *m, size_t len)
446 {
447         struct rxrpc_transport *trans;
448         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
449         int ret;
450 
451         _enter(",{%d},,%zu", rx->sk.sk_state, len);
452 
453         if (m->msg_flags & MSG_OOB)
454                 return -EOPNOTSUPP;
455 
456         if (m->msg_name) {
457                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
458                 if (ret < 0) {
459                         _leave(" = %d [bad addr]", ret);
460                         return ret;
461                 }
462         }
463 
464         trans = NULL;
465         lock_sock(&rx->sk);
466 
467         if (m->msg_name) {
468                 ret = -EISCONN;
469                 trans = rxrpc_name_to_transport(sock, m->msg_name,
470                                                 m->msg_namelen, 0, GFP_KERNEL);
471                 if (IS_ERR(trans)) {
472                         ret = PTR_ERR(trans);
473                         trans = NULL;
474                         goto out;
475                 }
476         } else {
477                 trans = rx->trans;
478                 if (trans)
479                         atomic_inc(&trans->usage);
480         }
481 
482         switch (rx->sk.sk_state) {
483         case RXRPC_SERVER_LISTENING:
484                 if (!m->msg_name) {
485                         ret = rxrpc_server_sendmsg(iocb, rx, m, len);
486                         break;
487                 }
488         case RXRPC_SERVER_BOUND:
489         case RXRPC_CLIENT_BOUND:
490                 if (!m->msg_name) {
491                         ret = -ENOTCONN;
492                         break;
493                 }
494         case RXRPC_CLIENT_CONNECTED:
495                 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
496                 break;
497         default:
498                 ret = -ENOTCONN;
499                 break;
500         }
501 
502 out:
503         release_sock(&rx->sk);
504         if (trans)
505                 rxrpc_put_transport(trans);
506         _leave(" = %d", ret);
507         return ret;
508 }
509 
510 /*
511  * set RxRPC socket options
512  */
513 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
514                             char __user *optval, unsigned int optlen)
515 {
516         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
517         unsigned int min_sec_level;
518         int ret;
519 
520         _enter(",%d,%d,,%d", level, optname, optlen);
521 
522         lock_sock(&rx->sk);
523         ret = -EOPNOTSUPP;
524 
525         if (level == SOL_RXRPC) {
526                 switch (optname) {
527                 case RXRPC_EXCLUSIVE_CONNECTION:
528                         ret = -EINVAL;
529                         if (optlen != 0)
530                                 goto error;
531                         ret = -EISCONN;
532                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
533                                 goto error;
534                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
535                         goto success;
536 
537                 case RXRPC_SECURITY_KEY:
538                         ret = -EINVAL;
539                         if (rx->key)
540                                 goto error;
541                         ret = -EISCONN;
542                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
543                                 goto error;
544                         ret = rxrpc_request_key(rx, optval, optlen);
545                         goto error;
546 
547                 case RXRPC_SECURITY_KEYRING:
548                         ret = -EINVAL;
549                         if (rx->key)
550                                 goto error;
551                         ret = -EISCONN;
552                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
553                                 goto error;
554                         ret = rxrpc_server_keyring(rx, optval, optlen);
555                         goto error;
556 
557                 case RXRPC_MIN_SECURITY_LEVEL:
558                         ret = -EINVAL;
559                         if (optlen != sizeof(unsigned int))
560                                 goto error;
561                         ret = -EISCONN;
562                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
563                                 goto error;
564                         ret = get_user(min_sec_level,
565                                        (unsigned int __user *) optval);
566                         if (ret < 0)
567                                 goto error;
568                         ret = -EINVAL;
569                         if (min_sec_level > RXRPC_SECURITY_MAX)
570                                 goto error;
571                         rx->min_sec_level = min_sec_level;
572                         goto success;
573 
574                 default:
575                         break;
576                 }
577         }
578 
579 success:
580         ret = 0;
581 error:
582         release_sock(&rx->sk);
583         return ret;
584 }
585 
586 /*
587  * permit an RxRPC socket to be polled
588  */
589 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
590                                poll_table *wait)
591 {
592         unsigned int mask;
593         struct sock *sk = sock->sk;
594 
595         sock_poll_wait(file, sk_sleep(sk), wait);
596         mask = 0;
597 
598         /* the socket is readable if there are any messages waiting on the Rx
599          * queue */
600         if (!skb_queue_empty(&sk->sk_receive_queue))
601                 mask |= POLLIN | POLLRDNORM;
602 
603         /* the socket is writable if there is space to add new data to the
604          * socket; there is no guarantee that any particular call in progress
605          * on the socket may have space in the Tx ACK window */
606         if (rxrpc_writable(sk))
607                 mask |= POLLOUT | POLLWRNORM;
608 
609         return mask;
610 }
611 
612 /*
613  * create an RxRPC socket
614  */
615 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
616                         int kern)
617 {
618         struct rxrpc_sock *rx;
619         struct sock *sk;
620 
621         _enter("%p,%d", sock, protocol);
622 
623         if (!net_eq(net, &init_net))
624                 return -EAFNOSUPPORT;
625 
626         /* we support transport protocol UDP only */
627         if (protocol != PF_INET)
628                 return -EPROTONOSUPPORT;
629 
630         if (sock->type != SOCK_DGRAM)
631                 return -ESOCKTNOSUPPORT;
632 
633         sock->ops = &rxrpc_rpc_ops;
634         sock->state = SS_UNCONNECTED;
635 
636         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
637         if (!sk)
638                 return -ENOMEM;
639 
640         sock_init_data(sock, sk);
641         sk->sk_state            = RXRPC_UNCONNECTED;
642         sk->sk_write_space      = rxrpc_write_space;
643         sk->sk_max_ack_backlog  = sysctl_rxrpc_max_qlen;
644         sk->sk_destruct         = rxrpc_sock_destructor;
645 
646         rx = rxrpc_sk(sk);
647         rx->proto = protocol;
648         rx->calls = RB_ROOT;
649 
650         INIT_LIST_HEAD(&rx->listen_link);
651         INIT_LIST_HEAD(&rx->secureq);
652         INIT_LIST_HEAD(&rx->acceptq);
653         rwlock_init(&rx->call_lock);
654         memset(&rx->srx, 0, sizeof(rx->srx));
655 
656         _leave(" = 0 [%p]", rx);
657         return 0;
658 }
659 
660 /*
661  * RxRPC socket destructor
662  */
663 static void rxrpc_sock_destructor(struct sock *sk)
664 {
665         _enter("%p", sk);
666 
667         rxrpc_purge_queue(&sk->sk_receive_queue);
668 
669         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
670         WARN_ON(!sk_unhashed(sk));
671         WARN_ON(sk->sk_socket);
672 
673         if (!sock_flag(sk, SOCK_DEAD)) {
674                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
675                 return;
676         }
677 }
678 
679 /*
680  * release an RxRPC socket
681  */
682 static int rxrpc_release_sock(struct sock *sk)
683 {
684         struct rxrpc_sock *rx = rxrpc_sk(sk);
685 
686         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
687 
688         /* declare the socket closed for business */
689         sock_orphan(sk);
690         sk->sk_shutdown = SHUTDOWN_MASK;
691 
692         spin_lock_bh(&sk->sk_receive_queue.lock);
693         sk->sk_state = RXRPC_CLOSE;
694         spin_unlock_bh(&sk->sk_receive_queue.lock);
695 
696         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
697 
698         if (!list_empty(&rx->listen_link)) {
699                 write_lock_bh(&rx->local->services_lock);
700                 list_del(&rx->listen_link);
701                 write_unlock_bh(&rx->local->services_lock);
702         }
703 
704         /* try to flush out this socket */
705         rxrpc_release_calls_on_socket(rx);
706         flush_workqueue(rxrpc_workqueue);
707         rxrpc_purge_queue(&sk->sk_receive_queue);
708 
709         if (rx->conn) {
710                 rxrpc_put_connection(rx->conn);
711                 rx->conn = NULL;
712         }
713 
714         if (rx->bundle) {
715                 rxrpc_put_bundle(rx->trans, rx->bundle);
716                 rx->bundle = NULL;
717         }
718         if (rx->trans) {
719                 rxrpc_put_transport(rx->trans);
720                 rx->trans = NULL;
721         }
722         if (rx->local) {
723                 rxrpc_put_local(rx->local);
724                 rx->local = NULL;
725         }
726 
727         key_put(rx->key);
728         rx->key = NULL;
729         key_put(rx->securities);
730         rx->securities = NULL;
731         sock_put(sk);
732 
733         _leave(" = 0");
734         return 0;
735 }
736 
737 /*
738  * release an RxRPC BSD socket on close() or equivalent
739  */
740 static int rxrpc_release(struct socket *sock)
741 {
742         struct sock *sk = sock->sk;
743 
744         _enter("%p{%p}", sock, sk);
745 
746         if (!sk)
747                 return 0;
748 
749         sock->sk = NULL;
750 
751         return rxrpc_release_sock(sk);
752 }
753 
754 /*
755  * RxRPC network protocol
756  */
757 static const struct proto_ops rxrpc_rpc_ops = {
758         .family         = PF_UNIX,
759         .owner          = THIS_MODULE,
760         .release        = rxrpc_release,
761         .bind           = rxrpc_bind,
762         .connect        = rxrpc_connect,
763         .socketpair     = sock_no_socketpair,
764         .accept         = sock_no_accept,
765         .getname        = sock_no_getname,
766         .poll           = rxrpc_poll,
767         .ioctl          = sock_no_ioctl,
768         .listen         = rxrpc_listen,
769         .shutdown       = sock_no_shutdown,
770         .setsockopt     = rxrpc_setsockopt,
771         .getsockopt     = sock_no_getsockopt,
772         .sendmsg        = rxrpc_sendmsg,
773         .recvmsg        = rxrpc_recvmsg,
774         .mmap           = sock_no_mmap,
775         .sendpage       = sock_no_sendpage,
776 };
777 
778 static struct proto rxrpc_proto = {
779         .name           = "RXRPC",
780         .owner          = THIS_MODULE,
781         .obj_size       = sizeof(struct rxrpc_sock),
782         .max_header     = sizeof(struct rxrpc_header),
783 };
784 
785 static const struct net_proto_family rxrpc_family_ops = {
786         .family = PF_RXRPC,
787         .create = rxrpc_create,
788         .owner  = THIS_MODULE,
789 };
790 
791 /*
792  * initialise and register the RxRPC protocol
793  */
794 static int __init af_rxrpc_init(void)
795 {
796         int ret = -1;
797 
798         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, 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_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
843         proc_create("rxrpc_conns", 0, init_net.proc_net,
844                     &rxrpc_connection_seq_fops);
845 #endif
846         return 0;
847 
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         unregister_key_type(&key_type_rxrpc_s);
869         unregister_key_type(&key_type_rxrpc);
870         sock_unregister(PF_RXRPC);
871         proto_unregister(&rxrpc_proto);
872         rxrpc_destroy_all_calls();
873         rxrpc_destroy_all_connections();
874         rxrpc_destroy_all_transports();
875         rxrpc_destroy_all_peers();
876         rxrpc_destroy_all_locals();
877 
878         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
879 
880         _debug("flush scheduled work");
881         flush_workqueue(rxrpc_workqueue);
882         remove_proc_entry("rxrpc_conns", init_net.proc_net);
883         remove_proc_entry("rxrpc_calls", init_net.proc_net);
884         destroy_workqueue(rxrpc_workqueue);
885         kmem_cache_destroy(rxrpc_call_jar);
886         _leave("");
887 }
888 
889 module_init(af_rxrpc_init);
890 module_exit(af_rxrpc_exit);
891 

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