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 */
rxrpc_writable(struct sock * sk)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 */
rxrpc_write_space(struct sock * sk)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 */
rxrpc_validate_address(struct rxrpc_sock * rx,struct sockaddr_rxrpc * srx,int len)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 */
rxrpc_bind(struct socket * sock,struct sockaddr * saddr,int len)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 */
rxrpc_listen(struct socket * sock,int backlog)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 default:
228 ret = -EBUSY;
229 break;
230 }
231
232 release_sock(&rx->sk);
233 _leave(" = %d", ret);
234 return ret;
235 }
236
237 /**
238 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
239 * @sock: The socket on which to make the call
240 * @srx: The address of the peer to contact
241 * @key: The security context to use (defaults to socket setting)
242 * @user_call_ID: The ID to use
243 * @gfp: The allocation constraints
244 * @notify_rx: Where to send notifications instead of socket queue
245 *
246 * Allow a kernel service to begin a call on the nominated socket. This just
247 * sets up all the internal tracking structures and allocates connection and
248 * call IDs as appropriate. The call to be used is returned.
249 *
250 * The default socket destination address and security may be overridden by
251 * supplying @srx and @key.
252 */
rxrpc_kernel_begin_call(struct socket * sock,struct sockaddr_rxrpc * srx,struct key * key,unsigned long user_call_ID,gfp_t gfp,rxrpc_notify_rx_t notify_rx)253 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
254 struct sockaddr_rxrpc *srx,
255 struct key *key,
256 unsigned long user_call_ID,
257 gfp_t gfp,
258 rxrpc_notify_rx_t notify_rx)
259 {
260 struct rxrpc_conn_parameters cp;
261 struct rxrpc_call *call;
262 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
263 int ret;
264
265 _enter(",,%x,%lx", key_serial(key), user_call_ID);
266
267 ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
268 if (ret < 0)
269 return ERR_PTR(ret);
270
271 lock_sock(&rx->sk);
272
273 if (!key)
274 key = rx->key;
275 if (key && !key->payload.data[0])
276 key = NULL; /* a no-security key */
277
278 memset(&cp, 0, sizeof(cp));
279 cp.local = rx->local;
280 cp.key = key;
281 cp.security_level = 0;
282 cp.exclusive = false;
283 cp.service_id = srx->srx_service;
284 call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
285 if (!IS_ERR(call))
286 call->notify_rx = notify_rx;
287
288 release_sock(&rx->sk);
289 _leave(" = %p", call);
290 return call;
291 }
292 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
293
294 /**
295 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
296 * @sock: The socket the call is on
297 * @call: The call to end
298 *
299 * Allow a kernel service to end a call it was using. The call must be
300 * complete before this is called (the call should be aborted if necessary).
301 */
rxrpc_kernel_end_call(struct socket * sock,struct rxrpc_call * call)302 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
303 {
304 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
305 rxrpc_release_call(rxrpc_sk(sock->sk), call);
306 rxrpc_put_call(call, rxrpc_call_put_kernel);
307 }
308 EXPORT_SYMBOL(rxrpc_kernel_end_call);
309
310 /**
311 * rxrpc_kernel_new_call_notification - Get notifications of new calls
312 * @sock: The socket to intercept received messages on
313 * @notify_new_call: Function to be called when new calls appear
314 * @discard_new_call: Function to discard preallocated calls
315 *
316 * Allow a kernel service to be given notifications about new calls.
317 */
rxrpc_kernel_new_call_notification(struct socket * sock,rxrpc_notify_new_call_t notify_new_call,rxrpc_discard_new_call_t discard_new_call)318 void rxrpc_kernel_new_call_notification(
319 struct socket *sock,
320 rxrpc_notify_new_call_t notify_new_call,
321 rxrpc_discard_new_call_t discard_new_call)
322 {
323 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
324
325 rx->notify_new_call = notify_new_call;
326 rx->discard_new_call = discard_new_call;
327 }
328 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
329
330 /*
331 * connect an RxRPC socket
332 * - this just targets it at a specific destination; no actual connection
333 * negotiation takes place
334 */
rxrpc_connect(struct socket * sock,struct sockaddr * addr,int addr_len,int flags)335 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
336 int addr_len, int flags)
337 {
338 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
339 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
340 int ret;
341
342 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
343
344 ret = rxrpc_validate_address(rx, srx, addr_len);
345 if (ret < 0) {
346 _leave(" = %d [bad addr]", ret);
347 return ret;
348 }
349
350 lock_sock(&rx->sk);
351
352 ret = -EISCONN;
353 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
354 goto error;
355
356 switch (rx->sk.sk_state) {
357 case RXRPC_UNBOUND:
358 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
359 case RXRPC_CLIENT_UNBOUND:
360 case RXRPC_CLIENT_BOUND:
361 break;
362 default:
363 ret = -EBUSY;
364 goto error;
365 }
366
367 rx->connect_srx = *srx;
368 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
369 ret = 0;
370
371 error:
372 release_sock(&rx->sk);
373 return ret;
374 }
375
376 /*
377 * send a message through an RxRPC socket
378 * - in a client this does a number of things:
379 * - finds/sets up a connection for the security specified (if any)
380 * - initiates a call (ID in control data)
381 * - ends the request phase of a call (if MSG_MORE is not set)
382 * - sends a call data packet
383 * - may send an abort (abort code in control data)
384 */
rxrpc_sendmsg(struct socket * sock,struct msghdr * m,size_t len)385 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
386 {
387 struct rxrpc_local *local;
388 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
389 int ret;
390
391 _enter(",{%d},,%zu", rx->sk.sk_state, len);
392
393 if (m->msg_flags & MSG_OOB)
394 return -EOPNOTSUPP;
395
396 if (m->msg_name) {
397 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
398 if (ret < 0) {
399 _leave(" = %d [bad addr]", ret);
400 return ret;
401 }
402 }
403
404 lock_sock(&rx->sk);
405
406 switch (rx->sk.sk_state) {
407 case RXRPC_UNBOUND:
408 rx->srx.srx_family = AF_RXRPC;
409 rx->srx.srx_service = 0;
410 rx->srx.transport_type = SOCK_DGRAM;
411 rx->srx.transport.family = rx->family;
412 switch (rx->family) {
413 case AF_INET:
414 rx->srx.transport_len = sizeof(struct sockaddr_in);
415 break;
416 #ifdef CONFIG_AF_RXRPC_IPV6
417 case AF_INET6:
418 rx->srx.transport_len = sizeof(struct sockaddr_in6);
419 break;
420 #endif
421 default:
422 ret = -EAFNOSUPPORT;
423 goto error_unlock;
424 }
425 local = rxrpc_lookup_local(&rx->srx);
426 if (IS_ERR(local)) {
427 ret = PTR_ERR(local);
428 goto error_unlock;
429 }
430
431 rx->local = local;
432 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
433 /* Fall through */
434
435 case RXRPC_CLIENT_UNBOUND:
436 case RXRPC_CLIENT_BOUND:
437 if (!m->msg_name &&
438 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
439 m->msg_name = &rx->connect_srx;
440 m->msg_namelen = sizeof(rx->connect_srx);
441 }
442 case RXRPC_SERVER_BOUND:
443 case RXRPC_SERVER_LISTENING:
444 ret = rxrpc_do_sendmsg(rx, m, len);
445 break;
446 default:
447 ret = -EINVAL;
448 break;
449 }
450
451 error_unlock:
452 release_sock(&rx->sk);
453 _leave(" = %d", ret);
454 return ret;
455 }
456
457 /*
458 * set RxRPC socket options
459 */
rxrpc_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)460 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
461 char __user *optval, unsigned int optlen)
462 {
463 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
464 unsigned int min_sec_level;
465 int ret;
466
467 _enter(",%d,%d,,%d", level, optname, optlen);
468
469 lock_sock(&rx->sk);
470 ret = -EOPNOTSUPP;
471
472 if (level == SOL_RXRPC) {
473 switch (optname) {
474 case RXRPC_EXCLUSIVE_CONNECTION:
475 ret = -EINVAL;
476 if (optlen != 0)
477 goto error;
478 ret = -EISCONN;
479 if (rx->sk.sk_state != RXRPC_UNBOUND)
480 goto error;
481 rx->exclusive = true;
482 goto success;
483
484 case RXRPC_SECURITY_KEY:
485 ret = -EINVAL;
486 if (rx->key)
487 goto error;
488 ret = -EISCONN;
489 if (rx->sk.sk_state != RXRPC_UNBOUND)
490 goto error;
491 ret = rxrpc_request_key(rx, optval, optlen);
492 goto error;
493
494 case RXRPC_SECURITY_KEYRING:
495 ret = -EINVAL;
496 if (rx->key)
497 goto error;
498 ret = -EISCONN;
499 if (rx->sk.sk_state != RXRPC_UNBOUND)
500 goto error;
501 ret = rxrpc_server_keyring(rx, optval, optlen);
502 goto error;
503
504 case RXRPC_MIN_SECURITY_LEVEL:
505 ret = -EINVAL;
506 if (optlen != sizeof(unsigned int))
507 goto error;
508 ret = -EISCONN;
509 if (rx->sk.sk_state != RXRPC_UNBOUND)
510 goto error;
511 ret = get_user(min_sec_level,
512 (unsigned int __user *) optval);
513 if (ret < 0)
514 goto error;
515 ret = -EINVAL;
516 if (min_sec_level > RXRPC_SECURITY_MAX)
517 goto error;
518 rx->min_sec_level = min_sec_level;
519 goto success;
520
521 default:
522 break;
523 }
524 }
525
526 success:
527 ret = 0;
528 error:
529 release_sock(&rx->sk);
530 return ret;
531 }
532
533 /*
534 * permit an RxRPC socket to be polled
535 */
rxrpc_poll(struct file * file,struct socket * sock,poll_table * wait)536 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
537 poll_table *wait)
538 {
539 struct sock *sk = sock->sk;
540 struct rxrpc_sock *rx = rxrpc_sk(sk);
541 unsigned int mask;
542
543 sock_poll_wait(file, sk_sleep(sk), wait);
544 mask = 0;
545
546 /* the socket is readable if there are any messages waiting on the Rx
547 * queue */
548 if (!list_empty(&rx->recvmsg_q))
549 mask |= POLLIN | POLLRDNORM;
550
551 /* the socket is writable if there is space to add new data to the
552 * socket; there is no guarantee that any particular call in progress
553 * on the socket may have space in the Tx ACK window */
554 if (rxrpc_writable(sk))
555 mask |= POLLOUT | POLLWRNORM;
556
557 return mask;
558 }
559
560 /*
561 * create an RxRPC socket
562 */
rxrpc_create(struct net * net,struct socket * sock,int protocol,int kern)563 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
564 int kern)
565 {
566 struct rxrpc_sock *rx;
567 struct sock *sk;
568
569 _enter("%p,%d", sock, protocol);
570
571 if (!net_eq(net, &init_net))
572 return -EAFNOSUPPORT;
573
574 /* we support transport protocol UDP/UDP6 only */
575 if (protocol != PF_INET &&
576 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
577 return -EPROTONOSUPPORT;
578
579 if (sock->type != SOCK_DGRAM)
580 return -ESOCKTNOSUPPORT;
581
582 sock->ops = &rxrpc_rpc_ops;
583 sock->state = SS_UNCONNECTED;
584
585 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
586 if (!sk)
587 return -ENOMEM;
588
589 sock_init_data(sock, sk);
590 sock_set_flag(sk, SOCK_RCU_FREE);
591 sk->sk_state = RXRPC_UNBOUND;
592 sk->sk_write_space = rxrpc_write_space;
593 sk->sk_max_ack_backlog = 0;
594 sk->sk_destruct = rxrpc_sock_destructor;
595
596 rx = rxrpc_sk(sk);
597 rx->family = protocol;
598 rx->calls = RB_ROOT;
599
600 spin_lock_init(&rx->incoming_lock);
601 INIT_LIST_HEAD(&rx->sock_calls);
602 INIT_LIST_HEAD(&rx->to_be_accepted);
603 INIT_LIST_HEAD(&rx->recvmsg_q);
604 rwlock_init(&rx->recvmsg_lock);
605 rwlock_init(&rx->call_lock);
606 memset(&rx->srx, 0, sizeof(rx->srx));
607
608 _leave(" = 0 [%p]", rx);
609 return 0;
610 }
611
612 /*
613 * Kill all the calls on a socket and shut it down.
614 */
rxrpc_shutdown(struct socket * sock,int flags)615 static int rxrpc_shutdown(struct socket *sock, int flags)
616 {
617 struct sock *sk = sock->sk;
618 struct rxrpc_sock *rx = rxrpc_sk(sk);
619 int ret = 0;
620
621 _enter("%p,%d", sk, flags);
622
623 if (flags != SHUT_RDWR)
624 return -EOPNOTSUPP;
625 if (sk->sk_state == RXRPC_CLOSE)
626 return -ESHUTDOWN;
627
628 lock_sock(sk);
629
630 spin_lock_bh(&sk->sk_receive_queue.lock);
631 if (sk->sk_state < RXRPC_CLOSE) {
632 sk->sk_state = RXRPC_CLOSE;
633 sk->sk_shutdown = SHUTDOWN_MASK;
634 } else {
635 ret = -ESHUTDOWN;
636 }
637 spin_unlock_bh(&sk->sk_receive_queue.lock);
638
639 rxrpc_discard_prealloc(rx);
640
641 release_sock(sk);
642 return ret;
643 }
644
645 /*
646 * RxRPC socket destructor
647 */
rxrpc_sock_destructor(struct sock * sk)648 static void rxrpc_sock_destructor(struct sock *sk)
649 {
650 _enter("%p", sk);
651
652 rxrpc_purge_queue(&sk->sk_receive_queue);
653
654 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
655 WARN_ON(!sk_unhashed(sk));
656 WARN_ON(sk->sk_socket);
657
658 if (!sock_flag(sk, SOCK_DEAD)) {
659 printk("Attempt to release alive rxrpc socket: %p\n", sk);
660 return;
661 }
662 }
663
664 /*
665 * release an RxRPC socket
666 */
rxrpc_release_sock(struct sock * sk)667 static int rxrpc_release_sock(struct sock *sk)
668 {
669 struct rxrpc_sock *rx = rxrpc_sk(sk);
670
671 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
672
673 /* declare the socket closed for business */
674 sock_orphan(sk);
675 sk->sk_shutdown = SHUTDOWN_MASK;
676
677 spin_lock_bh(&sk->sk_receive_queue.lock);
678 sk->sk_state = RXRPC_CLOSE;
679 spin_unlock_bh(&sk->sk_receive_queue.lock);
680
681 if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
682 write_lock(&rx->local->services_lock);
683 rcu_assign_pointer(rx->local->service, NULL);
684 write_unlock(&rx->local->services_lock);
685 }
686
687 /* try to flush out this socket */
688 rxrpc_discard_prealloc(rx);
689 rxrpc_release_calls_on_socket(rx);
690 flush_workqueue(rxrpc_workqueue);
691 rxrpc_purge_queue(&sk->sk_receive_queue);
692
693 rxrpc_put_local(rx->local);
694 rx->local = NULL;
695 key_put(rx->key);
696 rx->key = NULL;
697 key_put(rx->securities);
698 rx->securities = NULL;
699 sock_put(sk);
700
701 _leave(" = 0");
702 return 0;
703 }
704
705 /*
706 * release an RxRPC BSD socket on close() or equivalent
707 */
rxrpc_release(struct socket * sock)708 static int rxrpc_release(struct socket *sock)
709 {
710 struct sock *sk = sock->sk;
711
712 _enter("%p{%p}", sock, sk);
713
714 if (!sk)
715 return 0;
716
717 sock->sk = NULL;
718
719 return rxrpc_release_sock(sk);
720 }
721
722 /*
723 * RxRPC network protocol
724 */
725 static const struct proto_ops rxrpc_rpc_ops = {
726 .family = PF_RXRPC,
727 .owner = THIS_MODULE,
728 .release = rxrpc_release,
729 .bind = rxrpc_bind,
730 .connect = rxrpc_connect,
731 .socketpair = sock_no_socketpair,
732 .accept = sock_no_accept,
733 .getname = sock_no_getname,
734 .poll = rxrpc_poll,
735 .ioctl = sock_no_ioctl,
736 .listen = rxrpc_listen,
737 .shutdown = rxrpc_shutdown,
738 .setsockopt = rxrpc_setsockopt,
739 .getsockopt = sock_no_getsockopt,
740 .sendmsg = rxrpc_sendmsg,
741 .recvmsg = rxrpc_recvmsg,
742 .mmap = sock_no_mmap,
743 .sendpage = sock_no_sendpage,
744 };
745
746 static struct proto rxrpc_proto = {
747 .name = "RXRPC",
748 .owner = THIS_MODULE,
749 .obj_size = sizeof(struct rxrpc_sock),
750 .max_header = sizeof(struct rxrpc_wire_header),
751 };
752
753 static const struct net_proto_family rxrpc_family_ops = {
754 .family = PF_RXRPC,
755 .create = rxrpc_create,
756 .owner = THIS_MODULE,
757 };
758
759 /*
760 * initialise and register the RxRPC protocol
761 */
af_rxrpc_init(void)762 static int __init af_rxrpc_init(void)
763 {
764 int ret = -1;
765
766 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
767
768 get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
769 rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
770 get_random_bytes(&rxrpc_client_conn_ids.cur,
771 sizeof(rxrpc_client_conn_ids.cur));
772 rxrpc_client_conn_ids.cur &= 0x3fffffff;
773 if (rxrpc_client_conn_ids.cur == 0)
774 rxrpc_client_conn_ids.cur = 1;
775
776 ret = -ENOMEM;
777 rxrpc_call_jar = kmem_cache_create(
778 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
779 SLAB_HWCACHE_ALIGN, NULL);
780 if (!rxrpc_call_jar) {
781 pr_notice("Failed to allocate call jar\n");
782 goto error_call_jar;
783 }
784
785 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
786 if (!rxrpc_workqueue) {
787 pr_notice("Failed to allocate work queue\n");
788 goto error_work_queue;
789 }
790
791 ret = rxrpc_init_security();
792 if (ret < 0) {
793 pr_crit("Cannot initialise security\n");
794 goto error_security;
795 }
796
797 ret = proto_register(&rxrpc_proto, 1);
798 if (ret < 0) {
799 pr_crit("Cannot register protocol\n");
800 goto error_proto;
801 }
802
803 ret = sock_register(&rxrpc_family_ops);
804 if (ret < 0) {
805 pr_crit("Cannot register socket family\n");
806 goto error_sock;
807 }
808
809 ret = register_key_type(&key_type_rxrpc);
810 if (ret < 0) {
811 pr_crit("Cannot register client key type\n");
812 goto error_key_type;
813 }
814
815 ret = register_key_type(&key_type_rxrpc_s);
816 if (ret < 0) {
817 pr_crit("Cannot register server key type\n");
818 goto error_key_type_s;
819 }
820
821 ret = rxrpc_sysctl_init();
822 if (ret < 0) {
823 pr_crit("Cannot register sysctls\n");
824 goto error_sysctls;
825 }
826
827 #ifdef CONFIG_PROC_FS
828 proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
829 proc_create("rxrpc_conns", 0, init_net.proc_net,
830 &rxrpc_connection_seq_fops);
831 #endif
832 return 0;
833
834 error_sysctls:
835 unregister_key_type(&key_type_rxrpc_s);
836 error_key_type_s:
837 unregister_key_type(&key_type_rxrpc);
838 error_key_type:
839 sock_unregister(PF_RXRPC);
840 error_sock:
841 proto_unregister(&rxrpc_proto);
842 error_proto:
843 rxrpc_exit_security();
844 error_security:
845 destroy_workqueue(rxrpc_workqueue);
846 error_work_queue:
847 kmem_cache_destroy(rxrpc_call_jar);
848 error_call_jar:
849 return ret;
850 }
851
852 /*
853 * unregister the RxRPC protocol
854 */
af_rxrpc_exit(void)855 static void __exit af_rxrpc_exit(void)
856 {
857 _enter("");
858 rxrpc_sysctl_exit();
859 unregister_key_type(&key_type_rxrpc_s);
860 unregister_key_type(&key_type_rxrpc);
861 sock_unregister(PF_RXRPC);
862 proto_unregister(&rxrpc_proto);
863 rxrpc_destroy_all_calls();
864 rxrpc_destroy_all_connections();
865 ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
866 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
867 rxrpc_destroy_all_locals();
868
869 remove_proc_entry("rxrpc_conns", init_net.proc_net);
870 remove_proc_entry("rxrpc_calls", init_net.proc_net);
871 destroy_workqueue(rxrpc_workqueue);
872 rxrpc_exit_security();
873 kmem_cache_destroy(rxrpc_call_jar);
874 _leave("");
875 }
876
877 module_init(af_rxrpc_init);
878 module_exit(af_rxrpc_exit);
879