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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
29MODULE_DESCRIPTION("RxRPC network protocol");
30MODULE_AUTHOR("Red Hat, Inc.");
31MODULE_LICENSE("GPL");
32MODULE_ALIAS_NETPROTO(PF_RXRPC);
33
34unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
35module_param_named(debug, rxrpc_debug, uint, 0644);
36MODULE_PARM_DESC(debug, "RxRPC debugging mask");
37
38static struct proto rxrpc_proto;
39static const struct proto_ops rxrpc_rpc_ops;
40
41/* current debugging ID */
42atomic_t rxrpc_debug_id;
43EXPORT_SYMBOL(rxrpc_debug_id);
44
45/* count of skbs currently in use */
46atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
47
48struct workqueue_struct *rxrpc_workqueue;
49
50static void rxrpc_sock_destructor(struct sock *);
51
52/*
53 * see if an RxRPC socket is currently writable
54 */
55static inline int rxrpc_writable(struct sock *sk)
56{
57 return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
58}
59
60/*
61 * wait for write bufferage to become available
62 */
63static 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 */
80static 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->family)
101 return -EAFNOSUPPORT;
102
103 switch (srx->transport.family) {
104 case AF_INET:
105 if (srx->transport_len < sizeof(struct sockaddr_in))
106 return -EINVAL;
107 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
108 break;
109
110#ifdef CONFIG_AF_RXRPC_IPV6
111 case AF_INET6:
112 if (srx->transport_len < sizeof(struct sockaddr_in6))
113 return -EINVAL;
114 tail = offsetof(struct sockaddr_rxrpc, transport) +
115 sizeof(struct sockaddr_in6);
116 break;
117#endif
118
119 default:
120 return -EAFNOSUPPORT;
121 }
122
123 if (tail < len)
124 memset((void *)srx + tail, 0, len - tail);
125 _debug("INET: %pISp", &srx->transport);
126 return 0;
127}
128
129/*
130 * bind a local address to an RxRPC socket
131 */
132static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
133{
134 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
135 struct rxrpc_local *local;
136 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
137 u16 service_id = srx->srx_service;
138 int ret;
139
140 _enter("%p,%p,%d", rx, saddr, len);
141
142 ret = rxrpc_validate_address(rx, srx, len);
143 if (ret < 0)
144 goto error;
145
146 lock_sock(&rx->sk);
147
148 switch (rx->sk.sk_state) {
149 case RXRPC_UNBOUND:
150 rx->srx = *srx;
151 local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
152 if (IS_ERR(local)) {
153 ret = PTR_ERR(local);
154 goto error_unlock;
155 }
156
157 if (service_id) {
158 write_lock(&local->services_lock);
159 if (rcu_access_pointer(local->service))
160 goto service_in_use;
161 rx->local = local;
162 rcu_assign_pointer(local->service, rx);
163 write_unlock(&local->services_lock);
164
165 rx->sk.sk_state = RXRPC_SERVER_BOUND;
166 } else {
167 rx->local = local;
168 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
169 }
170 break;
171
172 case RXRPC_SERVER_BOUND:
173 ret = -EINVAL;
174 if (service_id == 0)
175 goto error_unlock;
176 ret = -EADDRINUSE;
177 if (service_id == rx->srx.srx_service)
178 goto error_unlock;
179 ret = -EINVAL;
180 srx->srx_service = rx->srx.srx_service;
181 if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
182 goto error_unlock;
183 rx->second_service = service_id;
184 rx->sk.sk_state = RXRPC_SERVER_BOUND2;
185 break;
186
187 default:
188 ret = -EINVAL;
189 goto error_unlock;
190 }
191
192 release_sock(&rx->sk);
193 _leave(" = 0");
194 return 0;
195
196service_in_use:
197 write_unlock(&local->services_lock);
198 rxrpc_put_local(local);
199 ret = -EADDRINUSE;
200error_unlock:
201 release_sock(&rx->sk);
202error:
203 _leave(" = %d", ret);
204 return ret;
205}
206
207/*
208 * set the number of pending calls permitted on a listening socket
209 */
210static int rxrpc_listen(struct socket *sock, int backlog)
211{
212 struct sock *sk = sock->sk;
213 struct rxrpc_sock *rx = rxrpc_sk(sk);
214 unsigned int max, old;
215 int ret;
216
217 _enter("%p,%d", rx, backlog);
218
219 lock_sock(&rx->sk);
220
221 switch (rx->sk.sk_state) {
222 case RXRPC_UNBOUND:
223 ret = -EADDRNOTAVAIL;
224 break;
225 case RXRPC_SERVER_BOUND:
226 case RXRPC_SERVER_BOUND2:
227 ASSERT(rx->local != NULL);
228 max = READ_ONCE(rxrpc_max_backlog);
229 ret = -EINVAL;
230 if (backlog == INT_MAX)
231 backlog = max;
232 else if (backlog < 0 || backlog > max)
233 break;
234 old = sk->sk_max_ack_backlog;
235 sk->sk_max_ack_backlog = backlog;
236 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
237 if (ret == 0)
238 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
239 else
240 sk->sk_max_ack_backlog = old;
241 break;
242 case RXRPC_SERVER_LISTENING:
243 if (backlog == 0) {
244 rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
245 sk->sk_max_ack_backlog = 0;
246 rxrpc_discard_prealloc(rx);
247 ret = 0;
248 break;
249 }
250 /* Fall through */
251 default:
252 ret = -EBUSY;
253 break;
254 }
255
256 release_sock(&rx->sk);
257 _leave(" = %d", ret);
258 return ret;
259}
260
261/**
262 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
263 * @sock: The socket on which to make the call
264 * @srx: The address of the peer to contact
265 * @key: The security context to use (defaults to socket setting)
266 * @user_call_ID: The ID to use
267 * @tx_total_len: Total length of data to transmit during the call (or -1)
268 * @gfp: The allocation constraints
269 * @notify_rx: Where to send notifications instead of socket queue
270 * @upgrade: Request service upgrade for call
271 * @debug_id: The debug ID for tracing to be assigned to the call
272 *
273 * Allow a kernel service to begin a call on the nominated socket. This just
274 * sets up all the internal tracking structures and allocates connection and
275 * call IDs as appropriate. The call to be used is returned.
276 *
277 * The default socket destination address and security may be overridden by
278 * supplying @srx and @key.
279 */
280struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
281 struct sockaddr_rxrpc *srx,
282 struct key *key,
283 unsigned long user_call_ID,
284 s64 tx_total_len,
285 gfp_t gfp,
286 rxrpc_notify_rx_t notify_rx,
287 bool upgrade,
288 unsigned int debug_id)
289{
290 struct rxrpc_conn_parameters cp;
291 struct rxrpc_call_params p;
292 struct rxrpc_call *call;
293 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
294 int ret;
295
296 _enter(",,%x,%lx", key_serial(key), user_call_ID);
297
298 ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
299 if (ret < 0)
300 return ERR_PTR(ret);
301
302 lock_sock(&rx->sk);
303
304 if (!key)
305 key = rx->key;
306 if (key && !key->payload.data[0])
307 key = NULL; /* a no-security key */
308
309 memset(&p, 0, sizeof(p));
310 p.user_call_ID = user_call_ID;
311 p.tx_total_len = tx_total_len;
312
313 memset(&cp, 0, sizeof(cp));
314 cp.local = rx->local;
315 cp.key = key;
316 cp.security_level = rx->min_sec_level;
317 cp.exclusive = false;
318 cp.upgrade = upgrade;
319 cp.service_id = srx->srx_service;
320 call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id);
321 /* The socket has been unlocked. */
322 if (!IS_ERR(call)) {
323 call->notify_rx = notify_rx;
324 mutex_unlock(&call->user_mutex);
325 }
326
327 rxrpc_put_peer(cp.peer);
328 _leave(" = %p", call);
329 return call;
330}
331EXPORT_SYMBOL(rxrpc_kernel_begin_call);
332
333/*
334 * Dummy function used to stop the notifier talking to recvmsg().
335 */
336static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
337 unsigned long call_user_ID)
338{
339}
340
341/**
342 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
343 * @sock: The socket the call is on
344 * @call: The call to end
345 *
346 * Allow a kernel service to end a call it was using. The call must be
347 * complete before this is called (the call should be aborted if necessary).
348 */
349void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
350{
351 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
352
353 mutex_lock(&call->user_mutex);
354 rxrpc_release_call(rxrpc_sk(sock->sk), call);
355
356 /* Make sure we're not going to call back into a kernel service */
357 if (call->notify_rx) {
358 spin_lock_bh(&call->notify_lock);
359 call->notify_rx = rxrpc_dummy_notify_rx;
360 spin_unlock_bh(&call->notify_lock);
361 }
362
363 mutex_unlock(&call->user_mutex);
364 rxrpc_put_call(call, rxrpc_call_put_kernel);
365}
366EXPORT_SYMBOL(rxrpc_kernel_end_call);
367
368/**
369 * rxrpc_kernel_check_life - Check to see whether a call is still alive
370 * @sock: The socket the call is on
371 * @call: The call to check
372 *
373 * Allow a kernel service to find out whether a call is still alive - ie. we're
374 * getting ACKs from the server. Returns a number representing the life state
375 * which can be compared to that returned by a previous call.
376 *
377 * If this is a client call, ping ACKs will be sent to the server to find out
378 * whether it's still responsive and whether the call is still alive on the
379 * server.
380 */
381u32 rxrpc_kernel_check_life(struct socket *sock, struct rxrpc_call *call)
382{
383 return call->acks_latest;
384}
385EXPORT_SYMBOL(rxrpc_kernel_check_life);
386
387/**
388 * rxrpc_kernel_check_call - Check a call's state
389 * @sock: The socket the call is on
390 * @call: The call to check
391 * @_compl: Where to store the completion state
392 * @_abort_code: Where to store any abort code
393 *
394 * Allow a kernel service to query the state of a call and find out the manner
395 * of its termination if it has completed. Returns -EINPROGRESS if the call is
396 * still going, 0 if the call finished successfully, -ECONNABORTED if the call
397 * was aborted and an appropriate error if the call failed in some other way.
398 */
399int rxrpc_kernel_check_call(struct socket *sock, struct rxrpc_call *call,
400 enum rxrpc_call_completion *_compl, u32 *_abort_code)
401{
402 if (call->state != RXRPC_CALL_COMPLETE)
403 return -EINPROGRESS;
404 smp_rmb();
405 *_compl = call->completion;
406 *_abort_code = call->abort_code;
407 return call->error;
408}
409EXPORT_SYMBOL(rxrpc_kernel_check_call);
410
411/**
412 * rxrpc_kernel_retry_call - Allow a kernel service to retry a call
413 * @sock: The socket the call is on
414 * @call: The call to retry
415 * @srx: The address of the peer to contact
416 * @key: The security context to use (defaults to socket setting)
417 *
418 * Allow a kernel service to try resending a client call that failed due to a
419 * network error to a new address. The Tx queue is maintained intact, thereby
420 * relieving the need to re-encrypt any request data that has already been
421 * buffered.
422 */
423int rxrpc_kernel_retry_call(struct socket *sock, struct rxrpc_call *call,
424 struct sockaddr_rxrpc *srx, struct key *key)
425{
426 struct rxrpc_conn_parameters cp;
427 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
428 int ret;
429
430 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
431
432 if (!key)
433 key = rx->key;
434 if (key && !key->payload.data[0])
435 key = NULL; /* a no-security key */
436
437 memset(&cp, 0, sizeof(cp));
438 cp.local = rx->local;
439 cp.key = key;
440 cp.security_level = 0;
441 cp.exclusive = false;
442 cp.service_id = srx->srx_service;
443
444 mutex_lock(&call->user_mutex);
445
446 ret = rxrpc_prepare_call_for_retry(rx, call);
447 if (ret == 0)
448 ret = rxrpc_retry_client_call(rx, call, &cp, srx, GFP_KERNEL);
449
450 mutex_unlock(&call->user_mutex);
451 rxrpc_put_peer(cp.peer);
452 _leave(" = %d", ret);
453 return ret;
454}
455EXPORT_SYMBOL(rxrpc_kernel_retry_call);
456
457/**
458 * rxrpc_kernel_new_call_notification - Get notifications of new calls
459 * @sock: The socket to intercept received messages on
460 * @notify_new_call: Function to be called when new calls appear
461 * @discard_new_call: Function to discard preallocated calls
462 *
463 * Allow a kernel service to be given notifications about new calls.
464 */
465void rxrpc_kernel_new_call_notification(
466 struct socket *sock,
467 rxrpc_notify_new_call_t notify_new_call,
468 rxrpc_discard_new_call_t discard_new_call)
469{
470 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
471
472 rx->notify_new_call = notify_new_call;
473 rx->discard_new_call = discard_new_call;
474}
475EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
476
477/*
478 * connect an RxRPC socket
479 * - this just targets it at a specific destination; no actual connection
480 * negotiation takes place
481 */
482static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
483 int addr_len, int flags)
484{
485 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
486 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
487 int ret;
488
489 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
490
491 ret = rxrpc_validate_address(rx, srx, addr_len);
492 if (ret < 0) {
493 _leave(" = %d [bad addr]", ret);
494 return ret;
495 }
496
497 lock_sock(&rx->sk);
498
499 ret = -EISCONN;
500 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
501 goto error;
502
503 switch (rx->sk.sk_state) {
504 case RXRPC_UNBOUND:
505 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
506 case RXRPC_CLIENT_UNBOUND:
507 case RXRPC_CLIENT_BOUND:
508 break;
509 default:
510 ret = -EBUSY;
511 goto error;
512 }
513
514 rx->connect_srx = *srx;
515 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
516 ret = 0;
517
518error:
519 release_sock(&rx->sk);
520 return ret;
521}
522
523/*
524 * send a message through an RxRPC socket
525 * - in a client this does a number of things:
526 * - finds/sets up a connection for the security specified (if any)
527 * - initiates a call (ID in control data)
528 * - ends the request phase of a call (if MSG_MORE is not set)
529 * - sends a call data packet
530 * - may send an abort (abort code in control data)
531 */
532static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
533{
534 struct rxrpc_local *local;
535 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
536 int ret;
537
538 _enter(",{%d},,%zu", rx->sk.sk_state, len);
539
540 if (m->msg_flags & MSG_OOB)
541 return -EOPNOTSUPP;
542
543 if (m->msg_name) {
544 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
545 if (ret < 0) {
546 _leave(" = %d [bad addr]", ret);
547 return ret;
548 }
549 }
550
551 lock_sock(&rx->sk);
552
553 switch (rx->sk.sk_state) {
554 case RXRPC_UNBOUND:
555 rx->srx.srx_family = AF_RXRPC;
556 rx->srx.srx_service = 0;
557 rx->srx.transport_type = SOCK_DGRAM;
558 rx->srx.transport.family = rx->family;
559 switch (rx->family) {
560 case AF_INET:
561 rx->srx.transport_len = sizeof(struct sockaddr_in);
562 break;
563#ifdef CONFIG_AF_RXRPC_IPV6
564 case AF_INET6:
565 rx->srx.transport_len = sizeof(struct sockaddr_in6);
566 break;
567#endif
568 default:
569 ret = -EAFNOSUPPORT;
570 goto error_unlock;
571 }
572 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
573 if (IS_ERR(local)) {
574 ret = PTR_ERR(local);
575 goto error_unlock;
576 }
577
578 rx->local = local;
579 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
580 /* Fall through */
581
582 case RXRPC_CLIENT_UNBOUND:
583 case RXRPC_CLIENT_BOUND:
584 if (!m->msg_name &&
585 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
586 m->msg_name = &rx->connect_srx;
587 m->msg_namelen = sizeof(rx->connect_srx);
588 }
589 /* Fall through */
590 case RXRPC_SERVER_BOUND:
591 case RXRPC_SERVER_LISTENING:
592 ret = rxrpc_do_sendmsg(rx, m, len);
593 /* The socket has been unlocked */
594 goto out;
595 default:
596 ret = -EINVAL;
597 goto error_unlock;
598 }
599
600error_unlock:
601 release_sock(&rx->sk);
602out:
603 _leave(" = %d", ret);
604 return ret;
605}
606
607/*
608 * set RxRPC socket options
609 */
610static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
611 char __user *optval, unsigned int optlen)
612{
613 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
614 unsigned int min_sec_level;
615 u16 service_upgrade[2];
616 int ret;
617
618 _enter(",%d,%d,,%d", level, optname, optlen);
619
620 lock_sock(&rx->sk);
621 ret = -EOPNOTSUPP;
622
623 if (level == SOL_RXRPC) {
624 switch (optname) {
625 case RXRPC_EXCLUSIVE_CONNECTION:
626 ret = -EINVAL;
627 if (optlen != 0)
628 goto error;
629 ret = -EISCONN;
630 if (rx->sk.sk_state != RXRPC_UNBOUND)
631 goto error;
632 rx->exclusive = true;
633 goto success;
634
635 case RXRPC_SECURITY_KEY:
636 ret = -EINVAL;
637 if (rx->key)
638 goto error;
639 ret = -EISCONN;
640 if (rx->sk.sk_state != RXRPC_UNBOUND)
641 goto error;
642 ret = rxrpc_request_key(rx, optval, optlen);
643 goto error;
644
645 case RXRPC_SECURITY_KEYRING:
646 ret = -EINVAL;
647 if (rx->key)
648 goto error;
649 ret = -EISCONN;
650 if (rx->sk.sk_state != RXRPC_UNBOUND)
651 goto error;
652 ret = rxrpc_server_keyring(rx, optval, optlen);
653 goto error;
654
655 case RXRPC_MIN_SECURITY_LEVEL:
656 ret = -EINVAL;
657 if (optlen != sizeof(unsigned int))
658 goto error;
659 ret = -EISCONN;
660 if (rx->sk.sk_state != RXRPC_UNBOUND)
661 goto error;
662 ret = get_user(min_sec_level,
663 (unsigned int __user *) optval);
664 if (ret < 0)
665 goto error;
666 ret = -EINVAL;
667 if (min_sec_level > RXRPC_SECURITY_MAX)
668 goto error;
669 rx->min_sec_level = min_sec_level;
670 goto success;
671
672 case RXRPC_UPGRADEABLE_SERVICE:
673 ret = -EINVAL;
674 if (optlen != sizeof(service_upgrade) ||
675 rx->service_upgrade.from != 0)
676 goto error;
677 ret = -EISCONN;
678 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
679 goto error;
680 ret = -EFAULT;
681 if (copy_from_user(service_upgrade, optval,
682 sizeof(service_upgrade)) != 0)
683 goto error;
684 ret = -EINVAL;
685 if ((service_upgrade[0] != rx->srx.srx_service ||
686 service_upgrade[1] != rx->second_service) &&
687 (service_upgrade[0] != rx->second_service ||
688 service_upgrade[1] != rx->srx.srx_service))
689 goto error;
690 rx->service_upgrade.from = service_upgrade[0];
691 rx->service_upgrade.to = service_upgrade[1];
692 goto success;
693
694 default:
695 break;
696 }
697 }
698
699success:
700 ret = 0;
701error:
702 release_sock(&rx->sk);
703 return ret;
704}
705
706/*
707 * Get socket options.
708 */
709static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
710 char __user *optval, int __user *_optlen)
711{
712 int optlen;
713
714 if (level != SOL_RXRPC)
715 return -EOPNOTSUPP;
716
717 if (get_user(optlen, _optlen))
718 return -EFAULT;
719
720 switch (optname) {
721 case RXRPC_SUPPORTED_CMSG:
722 if (optlen < sizeof(int))
723 return -ETOOSMALL;
724 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
725 put_user(sizeof(int), _optlen))
726 return -EFAULT;
727 return 0;
728
729 default:
730 return -EOPNOTSUPP;
731 }
732}
733
734/*
735 * permit an RxRPC socket to be polled
736 */
737static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
738 poll_table *wait)
739{
740 struct sock *sk = sock->sk;
741 struct rxrpc_sock *rx = rxrpc_sk(sk);
742 __poll_t mask;
743
744 sock_poll_wait(file, sk_sleep(sk), wait);
745 mask = 0;
746
747 /* the socket is readable if there are any messages waiting on the Rx
748 * queue */
749 if (!list_empty(&rx->recvmsg_q))
750 mask |= EPOLLIN | EPOLLRDNORM;
751
752 /* the socket is writable if there is space to add new data to the
753 * socket; there is no guarantee that any particular call in progress
754 * on the socket may have space in the Tx ACK window */
755 if (rxrpc_writable(sk))
756 mask |= EPOLLOUT | EPOLLWRNORM;
757
758 return mask;
759}
760
761/*
762 * create an RxRPC socket
763 */
764static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
765 int kern)
766{
767 struct rxrpc_net *rxnet;
768 struct rxrpc_sock *rx;
769 struct sock *sk;
770
771 _enter("%p,%d", sock, protocol);
772
773 /* we support transport protocol UDP/UDP6 only */
774 if (protocol != PF_INET &&
775 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
776 return -EPROTONOSUPPORT;
777
778 if (sock->type != SOCK_DGRAM)
779 return -ESOCKTNOSUPPORT;
780
781 sock->ops = &rxrpc_rpc_ops;
782 sock->state = SS_UNCONNECTED;
783
784 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
785 if (!sk)
786 return -ENOMEM;
787
788 sock_init_data(sock, sk);
789 sock_set_flag(sk, SOCK_RCU_FREE);
790 sk->sk_state = RXRPC_UNBOUND;
791 sk->sk_write_space = rxrpc_write_space;
792 sk->sk_max_ack_backlog = 0;
793 sk->sk_destruct = rxrpc_sock_destructor;
794
795 rx = rxrpc_sk(sk);
796 rx->family = protocol;
797 rx->calls = RB_ROOT;
798
799 spin_lock_init(&rx->incoming_lock);
800 INIT_LIST_HEAD(&rx->sock_calls);
801 INIT_LIST_HEAD(&rx->to_be_accepted);
802 INIT_LIST_HEAD(&rx->recvmsg_q);
803 rwlock_init(&rx->recvmsg_lock);
804 rwlock_init(&rx->call_lock);
805 memset(&rx->srx, 0, sizeof(rx->srx));
806
807 rxnet = rxrpc_net(sock_net(&rx->sk));
808 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
809
810 _leave(" = 0 [%p]", rx);
811 return 0;
812}
813
814/*
815 * Kill all the calls on a socket and shut it down.
816 */
817static int rxrpc_shutdown(struct socket *sock, int flags)
818{
819 struct sock *sk = sock->sk;
820 struct rxrpc_sock *rx = rxrpc_sk(sk);
821 int ret = 0;
822
823 _enter("%p,%d", sk, flags);
824
825 if (flags != SHUT_RDWR)
826 return -EOPNOTSUPP;
827 if (sk->sk_state == RXRPC_CLOSE)
828 return -ESHUTDOWN;
829
830 lock_sock(sk);
831
832 spin_lock_bh(&sk->sk_receive_queue.lock);
833 if (sk->sk_state < RXRPC_CLOSE) {
834 sk->sk_state = RXRPC_CLOSE;
835 sk->sk_shutdown = SHUTDOWN_MASK;
836 } else {
837 ret = -ESHUTDOWN;
838 }
839 spin_unlock_bh(&sk->sk_receive_queue.lock);
840
841 rxrpc_discard_prealloc(rx);
842
843 release_sock(sk);
844 return ret;
845}
846
847/*
848 * RxRPC socket destructor
849 */
850static void rxrpc_sock_destructor(struct sock *sk)
851{
852 _enter("%p", sk);
853
854 rxrpc_purge_queue(&sk->sk_receive_queue);
855
856 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
857 WARN_ON(!sk_unhashed(sk));
858 WARN_ON(sk->sk_socket);
859
860 if (!sock_flag(sk, SOCK_DEAD)) {
861 printk("Attempt to release alive rxrpc socket: %p\n", sk);
862 return;
863 }
864}
865
866/*
867 * release an RxRPC socket
868 */
869static int rxrpc_release_sock(struct sock *sk)
870{
871 struct rxrpc_sock *rx = rxrpc_sk(sk);
872 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
873
874 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
875
876 /* declare the socket closed for business */
877 sock_orphan(sk);
878 sk->sk_shutdown = SHUTDOWN_MASK;
879
880 /* We want to kill off all connections from a service socket
881 * as fast as possible because we can't share these; client
882 * sockets, on the other hand, can share an endpoint.
883 */
884 switch (sk->sk_state) {
885 case RXRPC_SERVER_BOUND:
886 case RXRPC_SERVER_BOUND2:
887 case RXRPC_SERVER_LISTENING:
888 case RXRPC_SERVER_LISTEN_DISABLED:
889 rx->local->service_closed = true;
890 break;
891 }
892
893 spin_lock_bh(&sk->sk_receive_queue.lock);
894 sk->sk_state = RXRPC_CLOSE;
895 spin_unlock_bh(&sk->sk_receive_queue.lock);
896
897 if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
898 write_lock(&rx->local->services_lock);
899 rcu_assign_pointer(rx->local->service, NULL);
900 write_unlock(&rx->local->services_lock);
901 }
902
903 /* try to flush out this socket */
904 rxrpc_discard_prealloc(rx);
905 rxrpc_release_calls_on_socket(rx);
906 flush_workqueue(rxrpc_workqueue);
907 rxrpc_purge_queue(&sk->sk_receive_queue);
908 rxrpc_queue_work(&rxnet->service_conn_reaper);
909 rxrpc_queue_work(&rxnet->client_conn_reaper);
910
911 rxrpc_put_local(rx->local);
912 rx->local = NULL;
913 key_put(rx->key);
914 rx->key = NULL;
915 key_put(rx->securities);
916 rx->securities = NULL;
917 sock_put(sk);
918
919 _leave(" = 0");
920 return 0;
921}
922
923/*
924 * release an RxRPC BSD socket on close() or equivalent
925 */
926static int rxrpc_release(struct socket *sock)
927{
928 struct sock *sk = sock->sk;
929
930 _enter("%p{%p}", sock, sk);
931
932 if (!sk)
933 return 0;
934
935 sock->sk = NULL;
936
937 return rxrpc_release_sock(sk);
938}
939
940/*
941 * RxRPC network protocol
942 */
943static const struct proto_ops rxrpc_rpc_ops = {
944 .family = PF_RXRPC,
945 .owner = THIS_MODULE,
946 .release = rxrpc_release,
947 .bind = rxrpc_bind,
948 .connect = rxrpc_connect,
949 .socketpair = sock_no_socketpair,
950 .accept = sock_no_accept,
951 .getname = sock_no_getname,
952 .poll = rxrpc_poll,
953 .ioctl = sock_no_ioctl,
954 .listen = rxrpc_listen,
955 .shutdown = rxrpc_shutdown,
956 .setsockopt = rxrpc_setsockopt,
957 .getsockopt = rxrpc_getsockopt,
958 .sendmsg = rxrpc_sendmsg,
959 .recvmsg = rxrpc_recvmsg,
960 .mmap = sock_no_mmap,
961 .sendpage = sock_no_sendpage,
962};
963
964static struct proto rxrpc_proto = {
965 .name = "RXRPC",
966 .owner = THIS_MODULE,
967 .obj_size = sizeof(struct rxrpc_sock),
968 .max_header = sizeof(struct rxrpc_wire_header),
969};
970
971static const struct net_proto_family rxrpc_family_ops = {
972 .family = PF_RXRPC,
973 .create = rxrpc_create,
974 .owner = THIS_MODULE,
975};
976
977/*
978 * initialise and register the RxRPC protocol
979 */
980static int __init af_rxrpc_init(void)
981{
982 int ret = -1;
983 unsigned int tmp;
984
985 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
986
987 get_random_bytes(&tmp, sizeof(tmp));
988 tmp &= 0x3fffffff;
989 if (tmp == 0)
990 tmp = 1;
991 idr_set_cursor(&rxrpc_client_conn_ids, tmp);
992
993 ret = -ENOMEM;
994 rxrpc_call_jar = kmem_cache_create(
995 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
996 SLAB_HWCACHE_ALIGN, NULL);
997 if (!rxrpc_call_jar) {
998 pr_notice("Failed to allocate call jar\n");
999 goto error_call_jar;
1000 }
1001
1002 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
1003 if (!rxrpc_workqueue) {
1004 pr_notice("Failed to allocate work queue\n");
1005 goto error_work_queue;
1006 }
1007
1008 ret = rxrpc_init_security();
1009 if (ret < 0) {
1010 pr_crit("Cannot initialise security\n");
1011 goto error_security;
1012 }
1013
1014 ret = register_pernet_subsys(&rxrpc_net_ops);
1015 if (ret)
1016 goto error_pernet;
1017
1018 ret = proto_register(&rxrpc_proto, 1);
1019 if (ret < 0) {
1020 pr_crit("Cannot register protocol\n");
1021 goto error_proto;
1022 }
1023
1024 ret = sock_register(&rxrpc_family_ops);
1025 if (ret < 0) {
1026 pr_crit("Cannot register socket family\n");
1027 goto error_sock;
1028 }
1029
1030 ret = register_key_type(&key_type_rxrpc);
1031 if (ret < 0) {
1032 pr_crit("Cannot register client key type\n");
1033 goto error_key_type;
1034 }
1035
1036 ret = register_key_type(&key_type_rxrpc_s);
1037 if (ret < 0) {
1038 pr_crit("Cannot register server key type\n");
1039 goto error_key_type_s;
1040 }
1041
1042 ret = rxrpc_sysctl_init();
1043 if (ret < 0) {
1044 pr_crit("Cannot register sysctls\n");
1045 goto error_sysctls;
1046 }
1047
1048 return 0;
1049
1050error_sysctls:
1051 unregister_key_type(&key_type_rxrpc_s);
1052error_key_type_s:
1053 unregister_key_type(&key_type_rxrpc);
1054error_key_type:
1055 sock_unregister(PF_RXRPC);
1056error_sock:
1057 proto_unregister(&rxrpc_proto);
1058error_proto:
1059 unregister_pernet_subsys(&rxrpc_net_ops);
1060error_pernet:
1061 rxrpc_exit_security();
1062error_security:
1063 destroy_workqueue(rxrpc_workqueue);
1064error_work_queue:
1065 kmem_cache_destroy(rxrpc_call_jar);
1066error_call_jar:
1067 return ret;
1068}
1069
1070/*
1071 * unregister the RxRPC protocol
1072 */
1073static void __exit af_rxrpc_exit(void)
1074{
1075 _enter("");
1076 rxrpc_sysctl_exit();
1077 unregister_key_type(&key_type_rxrpc_s);
1078 unregister_key_type(&key_type_rxrpc);
1079 sock_unregister(PF_RXRPC);
1080 proto_unregister(&rxrpc_proto);
1081 unregister_pernet_subsys(&rxrpc_net_ops);
1082 ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
1083 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1084
1085 /* Make sure the local and peer records pinned by any dying connections
1086 * are released.
1087 */
1088 rcu_barrier();
1089 rxrpc_destroy_client_conn_ids();
1090
1091 destroy_workqueue(rxrpc_workqueue);
1092 rxrpc_exit_security();
1093 kmem_cache_destroy(rxrpc_call_jar);
1094 _leave("");
1095}
1096
1097module_init(af_rxrpc_init);
1098module_exit(af_rxrpc_exit);
1/* AF_RXRPC implementation
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/net.h>
14#include <linux/slab.h>
15#include <linux/skbuff.h>
16#include <linux/poll.h>
17#include <linux/proc_fs.h>
18#include <linux/key-type.h>
19#include <net/net_namespace.h>
20#include <net/sock.h>
21#include <net/af_rxrpc.h>
22#include "ar-internal.h"
23
24MODULE_DESCRIPTION("RxRPC network protocol");
25MODULE_AUTHOR("Red Hat, Inc.");
26MODULE_LICENSE("GPL");
27MODULE_ALIAS_NETPROTO(PF_RXRPC);
28
29unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
30module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
31MODULE_PARM_DESC(debug, "RxRPC debugging mask");
32
33static int sysctl_rxrpc_max_qlen __read_mostly = 10;
34
35static struct proto rxrpc_proto;
36static const struct proto_ops rxrpc_rpc_ops;
37
38/* local epoch for detecting local-end reset */
39__be32 rxrpc_epoch;
40
41/* current debugging ID */
42atomic_t rxrpc_debug_id;
43
44/* count of skbs currently in use */
45atomic_t rxrpc_n_skbs;
46
47struct workqueue_struct *rxrpc_workqueue;
48
49static void rxrpc_sock_destructor(struct sock *);
50
51/*
52 * see if an RxRPC socket is currently writable
53 */
54static inline int rxrpc_writable(struct sock *sk)
55{
56 return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
57}
58
59/*
60 * wait for write bufferage to become available
61 */
62static void rxrpc_write_space(struct sock *sk)
63{
64 _enter("%p", sk);
65 rcu_read_lock();
66 if (rxrpc_writable(sk)) {
67 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
68
69 if (wq_has_sleeper(wq))
70 wake_up_interruptible(&wq->wait);
71 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
72 }
73 rcu_read_unlock();
74}
75
76/*
77 * validate an RxRPC address
78 */
79static int rxrpc_validate_address(struct rxrpc_sock *rx,
80 struct sockaddr_rxrpc *srx,
81 int len)
82{
83 if (len < sizeof(struct sockaddr_rxrpc))
84 return -EINVAL;
85
86 if (srx->srx_family != AF_RXRPC)
87 return -EAFNOSUPPORT;
88
89 if (srx->transport_type != SOCK_DGRAM)
90 return -ESOCKTNOSUPPORT;
91
92 len -= offsetof(struct sockaddr_rxrpc, transport);
93 if (srx->transport_len < sizeof(sa_family_t) ||
94 srx->transport_len > len)
95 return -EINVAL;
96
97 if (srx->transport.family != rx->proto)
98 return -EAFNOSUPPORT;
99
100 switch (srx->transport.family) {
101 case AF_INET:
102 _debug("INET: %x @ %pI4",
103 ntohs(srx->transport.sin.sin_port),
104 &srx->transport.sin.sin_addr);
105 if (srx->transport_len > 8)
106 memset((void *)&srx->transport + 8, 0,
107 srx->transport_len - 8);
108 break;
109
110 case AF_INET6:
111 default:
112 return -EAFNOSUPPORT;
113 }
114
115 return 0;
116}
117
118/*
119 * bind a local address to an RxRPC socket
120 */
121static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
122{
123 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
124 struct sock *sk = sock->sk;
125 struct rxrpc_local *local;
126 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
127 __be16 service_id;
128 int ret;
129
130 _enter("%p,%p,%d", rx, saddr, len);
131
132 ret = rxrpc_validate_address(rx, srx, len);
133 if (ret < 0)
134 goto error;
135
136 lock_sock(&rx->sk);
137
138 if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
139 ret = -EINVAL;
140 goto error_unlock;
141 }
142
143 memcpy(&rx->srx, srx, sizeof(rx->srx));
144
145 /* find a local transport endpoint if we don't have one already */
146 local = rxrpc_lookup_local(&rx->srx);
147 if (IS_ERR(local)) {
148 ret = PTR_ERR(local);
149 goto error_unlock;
150 }
151
152 rx->local = local;
153 if (srx->srx_service) {
154 service_id = htons(srx->srx_service);
155 write_lock_bh(&local->services_lock);
156 list_for_each_entry(prx, &local->services, listen_link) {
157 if (prx->service_id == service_id)
158 goto service_in_use;
159 }
160
161 rx->service_id = service_id;
162 list_add_tail(&rx->listen_link, &local->services);
163 write_unlock_bh(&local->services_lock);
164
165 rx->sk.sk_state = RXRPC_SERVER_BOUND;
166 } else {
167 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
168 }
169
170 release_sock(&rx->sk);
171 _leave(" = 0");
172 return 0;
173
174service_in_use:
175 ret = -EADDRINUSE;
176 write_unlock_bh(&local->services_lock);
177error_unlock:
178 release_sock(&rx->sk);
179error:
180 _leave(" = %d", ret);
181 return ret;
182}
183
184/*
185 * set the number of pending calls permitted on a listening socket
186 */
187static 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 */
222static 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 */
268struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
269 struct sockaddr_rxrpc *srx,
270 struct key *key,
271 unsigned long user_call_ID,
272 gfp_t gfp)
273{
274 struct rxrpc_conn_bundle *bundle;
275 struct rxrpc_transport *trans;
276 struct rxrpc_call *call;
277 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
278 __be16 service_id;
279
280 _enter(",,%x,%lx", key_serial(key), user_call_ID);
281
282 lock_sock(&rx->sk);
283
284 if (srx) {
285 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
286 sizeof(*srx), 0, gfp);
287 if (IS_ERR(trans)) {
288 call = ERR_CAST(trans);
289 trans = NULL;
290 goto out_notrans;
291 }
292 } else {
293 trans = rx->trans;
294 if (!trans) {
295 call = ERR_PTR(-ENOTCONN);
296 goto out_notrans;
297 }
298 atomic_inc(&trans->usage);
299 }
300
301 service_id = rx->service_id;
302 if (srx)
303 service_id = htons(srx->srx_service);
304
305 if (!key)
306 key = rx->key;
307 if (key && !key->payload.data)
308 key = NULL; /* a no-security key */
309
310 bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
311 if (IS_ERR(bundle)) {
312 call = ERR_CAST(bundle);
313 goto out;
314 }
315
316 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
317 gfp);
318 rxrpc_put_bundle(trans, bundle);
319out:
320 rxrpc_put_transport(trans);
321out_notrans:
322 release_sock(&rx->sk);
323 _leave(" = %p", call);
324 return call;
325}
326
327EXPORT_SYMBOL(rxrpc_kernel_begin_call);
328
329/**
330 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
331 * @call: The call to end
332 *
333 * Allow a kernel service to end a call it was using. The call must be
334 * complete before this is called (the call should be aborted if necessary).
335 */
336void rxrpc_kernel_end_call(struct rxrpc_call *call)
337{
338 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
339 rxrpc_remove_user_ID(call->socket, call);
340 rxrpc_put_call(call);
341}
342
343EXPORT_SYMBOL(rxrpc_kernel_end_call);
344
345/**
346 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
347 * @sock: The socket to intercept received messages on
348 * @interceptor: The function to pass the messages to
349 *
350 * Allow a kernel service to intercept messages heading for the Rx queue on an
351 * RxRPC socket. They get passed to the specified function instead.
352 * @interceptor should free the socket buffers it is given. @interceptor is
353 * called with the socket receive queue spinlock held and softirqs disabled -
354 * this ensures that the messages will be delivered in the right order.
355 */
356void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
357 rxrpc_interceptor_t interceptor)
358{
359 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
360
361 _enter("");
362 rx->interceptor = interceptor;
363}
364
365EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
366
367/*
368 * connect an RxRPC socket
369 * - this just targets it at a specific destination; no actual connection
370 * negotiation takes place
371 */
372static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
373 int addr_len, int flags)
374{
375 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
376 struct sock *sk = sock->sk;
377 struct rxrpc_transport *trans;
378 struct rxrpc_local *local;
379 struct rxrpc_sock *rx = rxrpc_sk(sk);
380 int ret;
381
382 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
383
384 ret = rxrpc_validate_address(rx, srx, addr_len);
385 if (ret < 0) {
386 _leave(" = %d [bad addr]", ret);
387 return ret;
388 }
389
390 lock_sock(&rx->sk);
391
392 switch (rx->sk.sk_state) {
393 case RXRPC_UNCONNECTED:
394 /* find a local transport endpoint if we don't have one already */
395 ASSERTCMP(rx->local, ==, NULL);
396 rx->srx.srx_family = AF_RXRPC;
397 rx->srx.srx_service = 0;
398 rx->srx.transport_type = srx->transport_type;
399 rx->srx.transport_len = sizeof(sa_family_t);
400 rx->srx.transport.family = srx->transport.family;
401 local = rxrpc_lookup_local(&rx->srx);
402 if (IS_ERR(local)) {
403 release_sock(&rx->sk);
404 return PTR_ERR(local);
405 }
406 rx->local = local;
407 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
408 case RXRPC_CLIENT_BOUND:
409 break;
410 case RXRPC_CLIENT_CONNECTED:
411 release_sock(&rx->sk);
412 return -EISCONN;
413 default:
414 release_sock(&rx->sk);
415 return -EBUSY; /* server sockets can't connect as well */
416 }
417
418 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
419 GFP_KERNEL);
420 if (IS_ERR(trans)) {
421 release_sock(&rx->sk);
422 _leave(" = %ld", PTR_ERR(trans));
423 return PTR_ERR(trans);
424 }
425
426 rx->trans = trans;
427 rx->service_id = htons(srx->srx_service);
428 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
429
430 release_sock(&rx->sk);
431 return 0;
432}
433
434/*
435 * send a message through an RxRPC socket
436 * - in a client this does a number of things:
437 * - finds/sets up a connection for the security specified (if any)
438 * - initiates a call (ID in control data)
439 * - ends the request phase of a call (if MSG_MORE is not set)
440 * - sends a call data packet
441 * - may send an abort (abort code in control data)
442 */
443static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
444 struct msghdr *m, size_t len)
445{
446 struct rxrpc_transport *trans;
447 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
448 int ret;
449
450 _enter(",{%d},,%zu", rx->sk.sk_state, len);
451
452 if (m->msg_flags & MSG_OOB)
453 return -EOPNOTSUPP;
454
455 if (m->msg_name) {
456 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
457 if (ret < 0) {
458 _leave(" = %d [bad addr]", ret);
459 return ret;
460 }
461 }
462
463 trans = NULL;
464 lock_sock(&rx->sk);
465
466 if (m->msg_name) {
467 ret = -EISCONN;
468 trans = rxrpc_name_to_transport(sock, m->msg_name,
469 m->msg_namelen, 0, GFP_KERNEL);
470 if (IS_ERR(trans)) {
471 ret = PTR_ERR(trans);
472 trans = NULL;
473 goto out;
474 }
475 } else {
476 trans = rx->trans;
477 if (trans)
478 atomic_inc(&trans->usage);
479 }
480
481 switch (rx->sk.sk_state) {
482 case RXRPC_SERVER_LISTENING:
483 if (!m->msg_name) {
484 ret = rxrpc_server_sendmsg(iocb, rx, m, len);
485 break;
486 }
487 case RXRPC_SERVER_BOUND:
488 case RXRPC_CLIENT_BOUND:
489 if (!m->msg_name) {
490 ret = -ENOTCONN;
491 break;
492 }
493 case RXRPC_CLIENT_CONNECTED:
494 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
495 break;
496 default:
497 ret = -ENOTCONN;
498 break;
499 }
500
501out:
502 release_sock(&rx->sk);
503 if (trans)
504 rxrpc_put_transport(trans);
505 _leave(" = %d", ret);
506 return ret;
507}
508
509/*
510 * set RxRPC socket options
511 */
512static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
513 char __user *optval, unsigned int optlen)
514{
515 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
516 unsigned min_sec_level;
517 int ret;
518
519 _enter(",%d,%d,,%d", level, optname, optlen);
520
521 lock_sock(&rx->sk);
522 ret = -EOPNOTSUPP;
523
524 if (level == SOL_RXRPC) {
525 switch (optname) {
526 case RXRPC_EXCLUSIVE_CONNECTION:
527 ret = -EINVAL;
528 if (optlen != 0)
529 goto error;
530 ret = -EISCONN;
531 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
532 goto error;
533 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
534 goto success;
535
536 case RXRPC_SECURITY_KEY:
537 ret = -EINVAL;
538 if (rx->key)
539 goto error;
540 ret = -EISCONN;
541 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
542 goto error;
543 ret = rxrpc_request_key(rx, optval, optlen);
544 goto error;
545
546 case RXRPC_SECURITY_KEYRING:
547 ret = -EINVAL;
548 if (rx->key)
549 goto error;
550 ret = -EISCONN;
551 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
552 goto error;
553 ret = rxrpc_server_keyring(rx, optval, optlen);
554 goto error;
555
556 case RXRPC_MIN_SECURITY_LEVEL:
557 ret = -EINVAL;
558 if (optlen != sizeof(unsigned))
559 goto error;
560 ret = -EISCONN;
561 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
562 goto error;
563 ret = get_user(min_sec_level,
564 (unsigned __user *) optval);
565 if (ret < 0)
566 goto error;
567 ret = -EINVAL;
568 if (min_sec_level > RXRPC_SECURITY_MAX)
569 goto error;
570 rx->min_sec_level = min_sec_level;
571 goto success;
572
573 default:
574 break;
575 }
576 }
577
578success:
579 ret = 0;
580error:
581 release_sock(&rx->sk);
582 return ret;
583}
584
585/*
586 * permit an RxRPC socket to be polled
587 */
588static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
589 poll_table *wait)
590{
591 unsigned int mask;
592 struct sock *sk = sock->sk;
593
594 sock_poll_wait(file, sk_sleep(sk), wait);
595 mask = 0;
596
597 /* the socket is readable if there are any messages waiting on the Rx
598 * queue */
599 if (!skb_queue_empty(&sk->sk_receive_queue))
600 mask |= POLLIN | POLLRDNORM;
601
602 /* the socket is writable if there is space to add new data to the
603 * socket; there is no guarantee that any particular call in progress
604 * on the socket may have space in the Tx ACK window */
605 if (rxrpc_writable(sk))
606 mask |= POLLOUT | POLLWRNORM;
607
608 return mask;
609}
610
611/*
612 * create an RxRPC socket
613 */
614static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
615 int kern)
616{
617 struct rxrpc_sock *rx;
618 struct sock *sk;
619
620 _enter("%p,%d", sock, protocol);
621
622 if (!net_eq(net, &init_net))
623 return -EAFNOSUPPORT;
624
625 /* we support transport protocol UDP only */
626 if (protocol != PF_INET)
627 return -EPROTONOSUPPORT;
628
629 if (sock->type != SOCK_DGRAM)
630 return -ESOCKTNOSUPPORT;
631
632 sock->ops = &rxrpc_rpc_ops;
633 sock->state = SS_UNCONNECTED;
634
635 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
636 if (!sk)
637 return -ENOMEM;
638
639 sock_init_data(sock, sk);
640 sk->sk_state = RXRPC_UNCONNECTED;
641 sk->sk_write_space = rxrpc_write_space;
642 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
643 sk->sk_destruct = rxrpc_sock_destructor;
644
645 rx = rxrpc_sk(sk);
646 rx->proto = protocol;
647 rx->calls = RB_ROOT;
648
649 INIT_LIST_HEAD(&rx->listen_link);
650 INIT_LIST_HEAD(&rx->secureq);
651 INIT_LIST_HEAD(&rx->acceptq);
652 rwlock_init(&rx->call_lock);
653 memset(&rx->srx, 0, sizeof(rx->srx));
654
655 _leave(" = 0 [%p]", rx);
656 return 0;
657}
658
659/*
660 * RxRPC socket destructor
661 */
662static 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 */
681static int rxrpc_release_sock(struct sock *sk)
682{
683 struct rxrpc_sock *rx = rxrpc_sk(sk);
684
685 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
686
687 /* declare the socket closed for business */
688 sock_orphan(sk);
689 sk->sk_shutdown = SHUTDOWN_MASK;
690
691 spin_lock_bh(&sk->sk_receive_queue.lock);
692 sk->sk_state = RXRPC_CLOSE;
693 spin_unlock_bh(&sk->sk_receive_queue.lock);
694
695 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
696
697 if (!list_empty(&rx->listen_link)) {
698 write_lock_bh(&rx->local->services_lock);
699 list_del(&rx->listen_link);
700 write_unlock_bh(&rx->local->services_lock);
701 }
702
703 /* try to flush out this socket */
704 rxrpc_release_calls_on_socket(rx);
705 flush_workqueue(rxrpc_workqueue);
706 rxrpc_purge_queue(&sk->sk_receive_queue);
707
708 if (rx->conn) {
709 rxrpc_put_connection(rx->conn);
710 rx->conn = NULL;
711 }
712
713 if (rx->bundle) {
714 rxrpc_put_bundle(rx->trans, rx->bundle);
715 rx->bundle = NULL;
716 }
717 if (rx->trans) {
718 rxrpc_put_transport(rx->trans);
719 rx->trans = NULL;
720 }
721 if (rx->local) {
722 rxrpc_put_local(rx->local);
723 rx->local = NULL;
724 }
725
726 key_put(rx->key);
727 rx->key = NULL;
728 key_put(rx->securities);
729 rx->securities = NULL;
730 sock_put(sk);
731
732 _leave(" = 0");
733 return 0;
734}
735
736/*
737 * release an RxRPC BSD socket on close() or equivalent
738 */
739static int rxrpc_release(struct socket *sock)
740{
741 struct sock *sk = sock->sk;
742
743 _enter("%p{%p}", sock, sk);
744
745 if (!sk)
746 return 0;
747
748 sock->sk = NULL;
749
750 return rxrpc_release_sock(sk);
751}
752
753/*
754 * RxRPC network protocol
755 */
756static const struct proto_ops rxrpc_rpc_ops = {
757 .family = PF_UNIX,
758 .owner = THIS_MODULE,
759 .release = rxrpc_release,
760 .bind = rxrpc_bind,
761 .connect = rxrpc_connect,
762 .socketpair = sock_no_socketpair,
763 .accept = sock_no_accept,
764 .getname = sock_no_getname,
765 .poll = rxrpc_poll,
766 .ioctl = sock_no_ioctl,
767 .listen = rxrpc_listen,
768 .shutdown = sock_no_shutdown,
769 .setsockopt = rxrpc_setsockopt,
770 .getsockopt = sock_no_getsockopt,
771 .sendmsg = rxrpc_sendmsg,
772 .recvmsg = rxrpc_recvmsg,
773 .mmap = sock_no_mmap,
774 .sendpage = sock_no_sendpage,
775};
776
777static struct proto rxrpc_proto = {
778 .name = "RXRPC",
779 .owner = THIS_MODULE,
780 .obj_size = sizeof(struct rxrpc_sock),
781 .max_header = sizeof(struct rxrpc_header),
782};
783
784static const struct net_proto_family rxrpc_family_ops = {
785 .family = PF_RXRPC,
786 .create = rxrpc_create,
787 .owner = THIS_MODULE,
788};
789
790/*
791 * initialise and register the RxRPC protocol
792 */
793static int __init af_rxrpc_init(void)
794{
795 struct sk_buff *dummy_skb;
796 int ret = -1;
797
798 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
799
800 rxrpc_epoch = htonl(get_seconds());
801
802 ret = -ENOMEM;
803 rxrpc_call_jar = kmem_cache_create(
804 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
805 SLAB_HWCACHE_ALIGN, NULL);
806 if (!rxrpc_call_jar) {
807 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
808 goto error_call_jar;
809 }
810
811 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
812 if (!rxrpc_workqueue) {
813 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
814 goto error_work_queue;
815 }
816
817 ret = proto_register(&rxrpc_proto, 1);
818 if (ret < 0) {
819 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
820 goto error_proto;
821 }
822
823 ret = sock_register(&rxrpc_family_ops);
824 if (ret < 0) {
825 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
826 goto error_sock;
827 }
828
829 ret = register_key_type(&key_type_rxrpc);
830 if (ret < 0) {
831 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
832 goto error_key_type;
833 }
834
835 ret = register_key_type(&key_type_rxrpc_s);
836 if (ret < 0) {
837 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
838 goto error_key_type_s;
839 }
840
841#ifdef CONFIG_PROC_FS
842 proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
843 proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
844#endif
845 return 0;
846
847error_key_type_s:
848 unregister_key_type(&key_type_rxrpc);
849error_key_type:
850 sock_unregister(PF_RXRPC);
851error_sock:
852 proto_unregister(&rxrpc_proto);
853error_proto:
854 destroy_workqueue(rxrpc_workqueue);
855error_work_queue:
856 kmem_cache_destroy(rxrpc_call_jar);
857error_call_jar:
858 return ret;
859}
860
861/*
862 * unregister the RxRPC protocol
863 */
864static void __exit af_rxrpc_exit(void)
865{
866 _enter("");
867 unregister_key_type(&key_type_rxrpc_s);
868 unregister_key_type(&key_type_rxrpc);
869 sock_unregister(PF_RXRPC);
870 proto_unregister(&rxrpc_proto);
871 rxrpc_destroy_all_calls();
872 rxrpc_destroy_all_connections();
873 rxrpc_destroy_all_transports();
874 rxrpc_destroy_all_peers();
875 rxrpc_destroy_all_locals();
876
877 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
878
879 _debug("flush scheduled work");
880 flush_workqueue(rxrpc_workqueue);
881 proc_net_remove(&init_net, "rxrpc_conns");
882 proc_net_remove(&init_net, "rxrpc_calls");
883 destroy_workqueue(rxrpc_workqueue);
884 kmem_cache_destroy(rxrpc_call_jar);
885 _leave("");
886}
887
888module_init(af_rxrpc_init);
889module_exit(af_rxrpc_exit);