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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* AF_RXRPC implementation
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/net.h>
13#include <linux/slab.h>
14#include <linux/skbuff.h>
15#include <linux/random.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#define CREATE_TRACE_POINTS
23#include "ar-internal.h"
24
25MODULE_DESCRIPTION("RxRPC network protocol");
26MODULE_AUTHOR("Red Hat, Inc.");
27MODULE_LICENSE("GPL");
28MODULE_ALIAS_NETPROTO(PF_RXRPC);
29
30unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
31module_param_named(debug, rxrpc_debug, uint, 0644);
32MODULE_PARM_DESC(debug, "RxRPC debugging mask");
33
34static struct proto rxrpc_proto;
35static const struct proto_ops rxrpc_rpc_ops;
36
37/* current debugging ID */
38atomic_t rxrpc_debug_id;
39EXPORT_SYMBOL(rxrpc_debug_id);
40
41/* count of skbs currently in use */
42atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
43
44struct workqueue_struct *rxrpc_workqueue;
45
46static void rxrpc_sock_destructor(struct sock *);
47
48/*
49 * see if an RxRPC socket is currently writable
50 */
51static inline int rxrpc_writable(struct sock *sk)
52{
53 return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
54}
55
56/*
57 * wait for write bufferage to become available
58 */
59static void rxrpc_write_space(struct sock *sk)
60{
61 _enter("%p", sk);
62 rcu_read_lock();
63 if (rxrpc_writable(sk)) {
64 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
65
66 if (skwq_has_sleeper(wq))
67 wake_up_interruptible(&wq->wait);
68 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
69 }
70 rcu_read_unlock();
71}
72
73/*
74 * validate an RxRPC address
75 */
76static int rxrpc_validate_address(struct rxrpc_sock *rx,
77 struct sockaddr_rxrpc *srx,
78 int len)
79{
80 unsigned int tail;
81
82 if (len < sizeof(struct sockaddr_rxrpc))
83 return -EINVAL;
84
85 if (srx->srx_family != AF_RXRPC)
86 return -EAFNOSUPPORT;
87
88 if (srx->transport_type != SOCK_DGRAM)
89 return -ESOCKTNOSUPPORT;
90
91 len -= offsetof(struct sockaddr_rxrpc, transport);
92 if (srx->transport_len < sizeof(sa_family_t) ||
93 srx->transport_len > len)
94 return -EINVAL;
95
96 if (srx->transport.family != rx->family &&
97 srx->transport.family == AF_INET && rx->family != AF_INET6)
98 return -EAFNOSUPPORT;
99
100 switch (srx->transport.family) {
101 case AF_INET:
102 if (srx->transport_len < sizeof(struct sockaddr_in))
103 return -EINVAL;
104 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
105 break;
106
107#ifdef CONFIG_AF_RXRPC_IPV6
108 case AF_INET6:
109 if (srx->transport_len < sizeof(struct sockaddr_in6))
110 return -EINVAL;
111 tail = offsetof(struct sockaddr_rxrpc, transport) +
112 sizeof(struct sockaddr_in6);
113 break;
114#endif
115
116 default:
117 return -EAFNOSUPPORT;
118 }
119
120 if (tail < len)
121 memset((void *)srx + tail, 0, len - tail);
122 _debug("INET: %pISp", &srx->transport);
123 return 0;
124}
125
126/*
127 * bind a local address to an RxRPC socket
128 */
129static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
130{
131 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
132 struct rxrpc_local *local;
133 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
134 u16 service_id;
135 int ret;
136
137 _enter("%p,%p,%d", rx, saddr, len);
138
139 ret = rxrpc_validate_address(rx, srx, len);
140 if (ret < 0)
141 goto error;
142 service_id = srx->srx_service;
143
144 lock_sock(&rx->sk);
145
146 switch (rx->sk.sk_state) {
147 case RXRPC_UNBOUND:
148 rx->srx = *srx;
149 local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
150 if (IS_ERR(local)) {
151 ret = PTR_ERR(local);
152 goto error_unlock;
153 }
154
155 if (service_id) {
156 write_lock(&local->services_lock);
157 if (rcu_access_pointer(local->service))
158 goto service_in_use;
159 rx->local = local;
160 rcu_assign_pointer(local->service, rx);
161 write_unlock(&local->services_lock);
162
163 rx->sk.sk_state = RXRPC_SERVER_BOUND;
164 } else {
165 rx->local = local;
166 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
167 }
168 break;
169
170 case RXRPC_SERVER_BOUND:
171 ret = -EINVAL;
172 if (service_id == 0)
173 goto error_unlock;
174 ret = -EADDRINUSE;
175 if (service_id == rx->srx.srx_service)
176 goto error_unlock;
177 ret = -EINVAL;
178 srx->srx_service = rx->srx.srx_service;
179 if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
180 goto error_unlock;
181 rx->second_service = service_id;
182 rx->sk.sk_state = RXRPC_SERVER_BOUND2;
183 break;
184
185 default:
186 ret = -EINVAL;
187 goto error_unlock;
188 }
189
190 release_sock(&rx->sk);
191 _leave(" = 0");
192 return 0;
193
194service_in_use:
195 write_unlock(&local->services_lock);
196 rxrpc_unuse_local(local);
197 rxrpc_put_local(local);
198 ret = -EADDRINUSE;
199error_unlock:
200 release_sock(&rx->sk);
201error:
202 _leave(" = %d", ret);
203 return ret;
204}
205
206/*
207 * set the number of pending calls permitted on a listening socket
208 */
209static int rxrpc_listen(struct socket *sock, int backlog)
210{
211 struct sock *sk = sock->sk;
212 struct rxrpc_sock *rx = rxrpc_sk(sk);
213 unsigned int max, old;
214 int ret;
215
216 _enter("%p,%d", rx, backlog);
217
218 lock_sock(&rx->sk);
219
220 switch (rx->sk.sk_state) {
221 case RXRPC_UNBOUND:
222 ret = -EADDRNOTAVAIL;
223 break;
224 case RXRPC_SERVER_BOUND:
225 case RXRPC_SERVER_BOUND2:
226 ASSERT(rx->local != NULL);
227 max = READ_ONCE(rxrpc_max_backlog);
228 ret = -EINVAL;
229 if (backlog == INT_MAX)
230 backlog = max;
231 else if (backlog < 0 || backlog > max)
232 break;
233 old = sk->sk_max_ack_backlog;
234 sk->sk_max_ack_backlog = backlog;
235 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
236 if (ret == 0)
237 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
238 else
239 sk->sk_max_ack_backlog = old;
240 break;
241 case RXRPC_SERVER_LISTENING:
242 if (backlog == 0) {
243 rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
244 sk->sk_max_ack_backlog = 0;
245 rxrpc_discard_prealloc(rx);
246 ret = 0;
247 break;
248 }
249 fallthrough;
250 default:
251 ret = -EBUSY;
252 break;
253 }
254
255 release_sock(&rx->sk);
256 _leave(" = %d", ret);
257 return ret;
258}
259
260/**
261 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
262 * @sock: The socket on which to make the call
263 * @srx: The address of the peer to contact
264 * @key: The security context to use (defaults to socket setting)
265 * @user_call_ID: The ID to use
266 * @tx_total_len: Total length of data to transmit during the call (or -1)
267 * @gfp: The allocation constraints
268 * @notify_rx: Where to send notifications instead of socket queue
269 * @upgrade: Request service upgrade for call
270 * @interruptibility: The call is interruptible, or can be canceled.
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 enum rxrpc_interruptibility interruptibility,
289 unsigned int debug_id)
290{
291 struct rxrpc_conn_parameters cp;
292 struct rxrpc_call_params p;
293 struct rxrpc_call *call;
294 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
295 int ret;
296
297 _enter(",,%x,%lx", key_serial(key), user_call_ID);
298
299 ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
300 if (ret < 0)
301 return ERR_PTR(ret);
302
303 lock_sock(&rx->sk);
304
305 if (!key)
306 key = rx->key;
307 if (key && !key->payload.data[0])
308 key = NULL; /* a no-security key */
309
310 memset(&p, 0, sizeof(p));
311 p.user_call_ID = user_call_ID;
312 p.tx_total_len = tx_total_len;
313 p.interruptibility = interruptibility;
314
315 memset(&cp, 0, sizeof(cp));
316 cp.local = rx->local;
317 cp.key = key;
318 cp.security_level = rx->min_sec_level;
319 cp.exclusive = false;
320 cp.upgrade = upgrade;
321 cp.service_id = srx->srx_service;
322 call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id);
323 /* The socket has been unlocked. */
324 if (!IS_ERR(call)) {
325 call->notify_rx = notify_rx;
326 mutex_unlock(&call->user_mutex);
327 }
328
329 rxrpc_put_peer(cp.peer);
330 _leave(" = %p", call);
331 return call;
332}
333EXPORT_SYMBOL(rxrpc_kernel_begin_call);
334
335/*
336 * Dummy function used to stop the notifier talking to recvmsg().
337 */
338static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
339 unsigned long call_user_ID)
340{
341}
342
343/**
344 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
345 * @sock: The socket the call is on
346 * @call: The call to end
347 *
348 * Allow a kernel service to end a call it was using. The call must be
349 * complete before this is called (the call should be aborted if necessary).
350 */
351void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
352{
353 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
354
355 mutex_lock(&call->user_mutex);
356 rxrpc_release_call(rxrpc_sk(sock->sk), call);
357
358 /* Make sure we're not going to call back into a kernel service */
359 if (call->notify_rx) {
360 spin_lock_bh(&call->notify_lock);
361 call->notify_rx = rxrpc_dummy_notify_rx;
362 spin_unlock_bh(&call->notify_lock);
363 }
364
365 mutex_unlock(&call->user_mutex);
366 rxrpc_put_call(call, rxrpc_call_put_kernel);
367}
368EXPORT_SYMBOL(rxrpc_kernel_end_call);
369
370/**
371 * rxrpc_kernel_check_life - Check to see whether a call is still alive
372 * @sock: The socket the call is on
373 * @call: The call to check
374 *
375 * Allow a kernel service to find out whether a call is still alive -
376 * ie. whether it has completed.
377 */
378bool rxrpc_kernel_check_life(const struct socket *sock,
379 const struct rxrpc_call *call)
380{
381 return call->state != RXRPC_CALL_COMPLETE;
382}
383EXPORT_SYMBOL(rxrpc_kernel_check_life);
384
385/**
386 * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
387 * @sock: The socket the call is on
388 * @call: The call to query
389 *
390 * Allow a kernel service to retrieve the epoch value from a service call to
391 * see if the client at the other end rebooted.
392 */
393u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
394{
395 return call->conn->proto.epoch;
396}
397EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
398
399/**
400 * rxrpc_kernel_new_call_notification - Get notifications of new calls
401 * @sock: The socket to intercept received messages on
402 * @notify_new_call: Function to be called when new calls appear
403 * @discard_new_call: Function to discard preallocated calls
404 *
405 * Allow a kernel service to be given notifications about new calls.
406 */
407void rxrpc_kernel_new_call_notification(
408 struct socket *sock,
409 rxrpc_notify_new_call_t notify_new_call,
410 rxrpc_discard_new_call_t discard_new_call)
411{
412 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
413
414 rx->notify_new_call = notify_new_call;
415 rx->discard_new_call = discard_new_call;
416}
417EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
418
419/**
420 * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
421 * @sock: The socket the call is on
422 * @call: The call to configure
423 * @hard_timeout: The maximum lifespan of the call in jiffies
424 *
425 * Set the maximum lifespan of a call. The call will end with ETIME or
426 * ETIMEDOUT if it takes longer than this.
427 */
428void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
429 unsigned long hard_timeout)
430{
431 unsigned long now;
432
433 mutex_lock(&call->user_mutex);
434
435 now = jiffies;
436 hard_timeout += now;
437 WRITE_ONCE(call->expect_term_by, hard_timeout);
438 rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
439
440 mutex_unlock(&call->user_mutex);
441}
442EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
443
444/*
445 * connect an RxRPC socket
446 * - this just targets it at a specific destination; no actual connection
447 * negotiation takes place
448 */
449static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
450 int addr_len, int flags)
451{
452 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
453 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
454 int ret;
455
456 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
457
458 ret = rxrpc_validate_address(rx, srx, addr_len);
459 if (ret < 0) {
460 _leave(" = %d [bad addr]", ret);
461 return ret;
462 }
463
464 lock_sock(&rx->sk);
465
466 ret = -EISCONN;
467 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
468 goto error;
469
470 switch (rx->sk.sk_state) {
471 case RXRPC_UNBOUND:
472 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
473 case RXRPC_CLIENT_UNBOUND:
474 case RXRPC_CLIENT_BOUND:
475 break;
476 default:
477 ret = -EBUSY;
478 goto error;
479 }
480
481 rx->connect_srx = *srx;
482 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
483 ret = 0;
484
485error:
486 release_sock(&rx->sk);
487 return ret;
488}
489
490/*
491 * send a message through an RxRPC socket
492 * - in a client this does a number of things:
493 * - finds/sets up a connection for the security specified (if any)
494 * - initiates a call (ID in control data)
495 * - ends the request phase of a call (if MSG_MORE is not set)
496 * - sends a call data packet
497 * - may send an abort (abort code in control data)
498 */
499static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
500{
501 struct rxrpc_local *local;
502 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
503 int ret;
504
505 _enter(",{%d},,%zu", rx->sk.sk_state, len);
506
507 if (m->msg_flags & MSG_OOB)
508 return -EOPNOTSUPP;
509
510 if (m->msg_name) {
511 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
512 if (ret < 0) {
513 _leave(" = %d [bad addr]", ret);
514 return ret;
515 }
516 }
517
518 lock_sock(&rx->sk);
519
520 switch (rx->sk.sk_state) {
521 case RXRPC_UNBOUND:
522 case RXRPC_CLIENT_UNBOUND:
523 rx->srx.srx_family = AF_RXRPC;
524 rx->srx.srx_service = 0;
525 rx->srx.transport_type = SOCK_DGRAM;
526 rx->srx.transport.family = rx->family;
527 switch (rx->family) {
528 case AF_INET:
529 rx->srx.transport_len = sizeof(struct sockaddr_in);
530 break;
531#ifdef CONFIG_AF_RXRPC_IPV6
532 case AF_INET6:
533 rx->srx.transport_len = sizeof(struct sockaddr_in6);
534 break;
535#endif
536 default:
537 ret = -EAFNOSUPPORT;
538 goto error_unlock;
539 }
540 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
541 if (IS_ERR(local)) {
542 ret = PTR_ERR(local);
543 goto error_unlock;
544 }
545
546 rx->local = local;
547 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
548 fallthrough;
549
550 case RXRPC_CLIENT_BOUND:
551 if (!m->msg_name &&
552 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
553 m->msg_name = &rx->connect_srx;
554 m->msg_namelen = sizeof(rx->connect_srx);
555 }
556 fallthrough;
557 case RXRPC_SERVER_BOUND:
558 case RXRPC_SERVER_LISTENING:
559 ret = rxrpc_do_sendmsg(rx, m, len);
560 /* The socket has been unlocked */
561 goto out;
562 default:
563 ret = -EINVAL;
564 goto error_unlock;
565 }
566
567error_unlock:
568 release_sock(&rx->sk);
569out:
570 _leave(" = %d", ret);
571 return ret;
572}
573
574int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
575{
576 if (sk->sk_state != RXRPC_UNBOUND)
577 return -EISCONN;
578 if (val > RXRPC_SECURITY_MAX)
579 return -EINVAL;
580 lock_sock(sk);
581 rxrpc_sk(sk)->min_sec_level = val;
582 release_sock(sk);
583 return 0;
584}
585EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
586
587/*
588 * set RxRPC socket options
589 */
590static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
591 sockptr_t optval, unsigned int optlen)
592{
593 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
594 unsigned int min_sec_level;
595 u16 service_upgrade[2];
596 int ret;
597
598 _enter(",%d,%d,,%d", level, optname, optlen);
599
600 lock_sock(&rx->sk);
601 ret = -EOPNOTSUPP;
602
603 if (level == SOL_RXRPC) {
604 switch (optname) {
605 case RXRPC_EXCLUSIVE_CONNECTION:
606 ret = -EINVAL;
607 if (optlen != 0)
608 goto error;
609 ret = -EISCONN;
610 if (rx->sk.sk_state != RXRPC_UNBOUND)
611 goto error;
612 rx->exclusive = true;
613 goto success;
614
615 case RXRPC_SECURITY_KEY:
616 ret = -EINVAL;
617 if (rx->key)
618 goto error;
619 ret = -EISCONN;
620 if (rx->sk.sk_state != RXRPC_UNBOUND)
621 goto error;
622 ret = rxrpc_request_key(rx, optval, optlen);
623 goto error;
624
625 case RXRPC_SECURITY_KEYRING:
626 ret = -EINVAL;
627 if (rx->key)
628 goto error;
629 ret = -EISCONN;
630 if (rx->sk.sk_state != RXRPC_UNBOUND)
631 goto error;
632 ret = rxrpc_server_keyring(rx, optval, optlen);
633 goto error;
634
635 case RXRPC_MIN_SECURITY_LEVEL:
636 ret = -EINVAL;
637 if (optlen != sizeof(unsigned int))
638 goto error;
639 ret = -EISCONN;
640 if (rx->sk.sk_state != RXRPC_UNBOUND)
641 goto error;
642 ret = copy_from_sockptr(&min_sec_level, optval,
643 sizeof(unsigned int));
644 if (ret < 0)
645 goto error;
646 ret = -EINVAL;
647 if (min_sec_level > RXRPC_SECURITY_MAX)
648 goto error;
649 rx->min_sec_level = min_sec_level;
650 goto success;
651
652 case RXRPC_UPGRADEABLE_SERVICE:
653 ret = -EINVAL;
654 if (optlen != sizeof(service_upgrade) ||
655 rx->service_upgrade.from != 0)
656 goto error;
657 ret = -EISCONN;
658 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
659 goto error;
660 ret = -EFAULT;
661 if (copy_from_sockptr(service_upgrade, optval,
662 sizeof(service_upgrade)) != 0)
663 goto error;
664 ret = -EINVAL;
665 if ((service_upgrade[0] != rx->srx.srx_service ||
666 service_upgrade[1] != rx->second_service) &&
667 (service_upgrade[0] != rx->second_service ||
668 service_upgrade[1] != rx->srx.srx_service))
669 goto error;
670 rx->service_upgrade.from = service_upgrade[0];
671 rx->service_upgrade.to = service_upgrade[1];
672 goto success;
673
674 default:
675 break;
676 }
677 }
678
679success:
680 ret = 0;
681error:
682 release_sock(&rx->sk);
683 return ret;
684}
685
686/*
687 * Get socket options.
688 */
689static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
690 char __user *optval, int __user *_optlen)
691{
692 int optlen;
693
694 if (level != SOL_RXRPC)
695 return -EOPNOTSUPP;
696
697 if (get_user(optlen, _optlen))
698 return -EFAULT;
699
700 switch (optname) {
701 case RXRPC_SUPPORTED_CMSG:
702 if (optlen < sizeof(int))
703 return -ETOOSMALL;
704 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
705 put_user(sizeof(int), _optlen))
706 return -EFAULT;
707 return 0;
708
709 default:
710 return -EOPNOTSUPP;
711 }
712}
713
714/*
715 * permit an RxRPC socket to be polled
716 */
717static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
718 poll_table *wait)
719{
720 struct sock *sk = sock->sk;
721 struct rxrpc_sock *rx = rxrpc_sk(sk);
722 __poll_t mask;
723
724 sock_poll_wait(file, sock, wait);
725 mask = 0;
726
727 /* the socket is readable if there are any messages waiting on the Rx
728 * queue */
729 if (!list_empty(&rx->recvmsg_q))
730 mask |= EPOLLIN | EPOLLRDNORM;
731
732 /* the socket is writable if there is space to add new data to the
733 * socket; there is no guarantee that any particular call in progress
734 * on the socket may have space in the Tx ACK window */
735 if (rxrpc_writable(sk))
736 mask |= EPOLLOUT | EPOLLWRNORM;
737
738 return mask;
739}
740
741/*
742 * create an RxRPC socket
743 */
744static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
745 int kern)
746{
747 struct rxrpc_net *rxnet;
748 struct rxrpc_sock *rx;
749 struct sock *sk;
750
751 _enter("%p,%d", sock, protocol);
752
753 /* we support transport protocol UDP/UDP6 only */
754 if (protocol != PF_INET &&
755 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
756 return -EPROTONOSUPPORT;
757
758 if (sock->type != SOCK_DGRAM)
759 return -ESOCKTNOSUPPORT;
760
761 sock->ops = &rxrpc_rpc_ops;
762 sock->state = SS_UNCONNECTED;
763
764 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
765 if (!sk)
766 return -ENOMEM;
767
768 sock_init_data(sock, sk);
769 sock_set_flag(sk, SOCK_RCU_FREE);
770 sk->sk_state = RXRPC_UNBOUND;
771 sk->sk_write_space = rxrpc_write_space;
772 sk->sk_max_ack_backlog = 0;
773 sk->sk_destruct = rxrpc_sock_destructor;
774
775 rx = rxrpc_sk(sk);
776 rx->family = protocol;
777 rx->calls = RB_ROOT;
778
779 spin_lock_init(&rx->incoming_lock);
780 INIT_LIST_HEAD(&rx->sock_calls);
781 INIT_LIST_HEAD(&rx->to_be_accepted);
782 INIT_LIST_HEAD(&rx->recvmsg_q);
783 rwlock_init(&rx->recvmsg_lock);
784 rwlock_init(&rx->call_lock);
785 memset(&rx->srx, 0, sizeof(rx->srx));
786
787 rxnet = rxrpc_net(sock_net(&rx->sk));
788 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
789
790 _leave(" = 0 [%p]", rx);
791 return 0;
792}
793
794/*
795 * Kill all the calls on a socket and shut it down.
796 */
797static int rxrpc_shutdown(struct socket *sock, int flags)
798{
799 struct sock *sk = sock->sk;
800 struct rxrpc_sock *rx = rxrpc_sk(sk);
801 int ret = 0;
802
803 _enter("%p,%d", sk, flags);
804
805 if (flags != SHUT_RDWR)
806 return -EOPNOTSUPP;
807 if (sk->sk_state == RXRPC_CLOSE)
808 return -ESHUTDOWN;
809
810 lock_sock(sk);
811
812 spin_lock_bh(&sk->sk_receive_queue.lock);
813 if (sk->sk_state < RXRPC_CLOSE) {
814 sk->sk_state = RXRPC_CLOSE;
815 sk->sk_shutdown = SHUTDOWN_MASK;
816 } else {
817 ret = -ESHUTDOWN;
818 }
819 spin_unlock_bh(&sk->sk_receive_queue.lock);
820
821 rxrpc_discard_prealloc(rx);
822
823 release_sock(sk);
824 return ret;
825}
826
827/*
828 * RxRPC socket destructor
829 */
830static void rxrpc_sock_destructor(struct sock *sk)
831{
832 _enter("%p", sk);
833
834 rxrpc_purge_queue(&sk->sk_receive_queue);
835
836 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
837 WARN_ON(!sk_unhashed(sk));
838 WARN_ON(sk->sk_socket);
839
840 if (!sock_flag(sk, SOCK_DEAD)) {
841 printk("Attempt to release alive rxrpc socket: %p\n", sk);
842 return;
843 }
844}
845
846/*
847 * release an RxRPC socket
848 */
849static int rxrpc_release_sock(struct sock *sk)
850{
851 struct rxrpc_sock *rx = rxrpc_sk(sk);
852
853 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
854
855 /* declare the socket closed for business */
856 sock_orphan(sk);
857 sk->sk_shutdown = SHUTDOWN_MASK;
858
859 /* We want to kill off all connections from a service socket
860 * as fast as possible because we can't share these; client
861 * sockets, on the other hand, can share an endpoint.
862 */
863 switch (sk->sk_state) {
864 case RXRPC_SERVER_BOUND:
865 case RXRPC_SERVER_BOUND2:
866 case RXRPC_SERVER_LISTENING:
867 case RXRPC_SERVER_LISTEN_DISABLED:
868 rx->local->service_closed = true;
869 break;
870 }
871
872 spin_lock_bh(&sk->sk_receive_queue.lock);
873 sk->sk_state = RXRPC_CLOSE;
874 spin_unlock_bh(&sk->sk_receive_queue.lock);
875
876 if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
877 write_lock(&rx->local->services_lock);
878 rcu_assign_pointer(rx->local->service, NULL);
879 write_unlock(&rx->local->services_lock);
880 }
881
882 /* try to flush out this socket */
883 rxrpc_discard_prealloc(rx);
884 rxrpc_release_calls_on_socket(rx);
885 flush_workqueue(rxrpc_workqueue);
886 rxrpc_purge_queue(&sk->sk_receive_queue);
887
888 rxrpc_unuse_local(rx->local);
889 rxrpc_put_local(rx->local);
890 rx->local = NULL;
891 key_put(rx->key);
892 rx->key = NULL;
893 key_put(rx->securities);
894 rx->securities = NULL;
895 sock_put(sk);
896
897 _leave(" = 0");
898 return 0;
899}
900
901/*
902 * release an RxRPC BSD socket on close() or equivalent
903 */
904static int rxrpc_release(struct socket *sock)
905{
906 struct sock *sk = sock->sk;
907
908 _enter("%p{%p}", sock, sk);
909
910 if (!sk)
911 return 0;
912
913 sock->sk = NULL;
914
915 return rxrpc_release_sock(sk);
916}
917
918/*
919 * RxRPC network protocol
920 */
921static const struct proto_ops rxrpc_rpc_ops = {
922 .family = PF_RXRPC,
923 .owner = THIS_MODULE,
924 .release = rxrpc_release,
925 .bind = rxrpc_bind,
926 .connect = rxrpc_connect,
927 .socketpair = sock_no_socketpair,
928 .accept = sock_no_accept,
929 .getname = sock_no_getname,
930 .poll = rxrpc_poll,
931 .ioctl = sock_no_ioctl,
932 .listen = rxrpc_listen,
933 .shutdown = rxrpc_shutdown,
934 .setsockopt = rxrpc_setsockopt,
935 .getsockopt = rxrpc_getsockopt,
936 .sendmsg = rxrpc_sendmsg,
937 .recvmsg = rxrpc_recvmsg,
938 .mmap = sock_no_mmap,
939 .sendpage = sock_no_sendpage,
940};
941
942static struct proto rxrpc_proto = {
943 .name = "RXRPC",
944 .owner = THIS_MODULE,
945 .obj_size = sizeof(struct rxrpc_sock),
946 .max_header = sizeof(struct rxrpc_wire_header),
947};
948
949static const struct net_proto_family rxrpc_family_ops = {
950 .family = PF_RXRPC,
951 .create = rxrpc_create,
952 .owner = THIS_MODULE,
953};
954
955/*
956 * initialise and register the RxRPC protocol
957 */
958static int __init af_rxrpc_init(void)
959{
960 int ret = -1;
961 unsigned int tmp;
962
963 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
964
965 get_random_bytes(&tmp, sizeof(tmp));
966 tmp &= 0x3fffffff;
967 if (tmp == 0)
968 tmp = 1;
969 idr_set_cursor(&rxrpc_client_conn_ids, tmp);
970
971 ret = -ENOMEM;
972 rxrpc_call_jar = kmem_cache_create(
973 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
974 SLAB_HWCACHE_ALIGN, NULL);
975 if (!rxrpc_call_jar) {
976 pr_notice("Failed to allocate call jar\n");
977 goto error_call_jar;
978 }
979
980 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
981 if (!rxrpc_workqueue) {
982 pr_notice("Failed to allocate work queue\n");
983 goto error_work_queue;
984 }
985
986 ret = rxrpc_init_security();
987 if (ret < 0) {
988 pr_crit("Cannot initialise security\n");
989 goto error_security;
990 }
991
992 ret = register_pernet_subsys(&rxrpc_net_ops);
993 if (ret)
994 goto error_pernet;
995
996 ret = proto_register(&rxrpc_proto, 1);
997 if (ret < 0) {
998 pr_crit("Cannot register protocol\n");
999 goto error_proto;
1000 }
1001
1002 ret = sock_register(&rxrpc_family_ops);
1003 if (ret < 0) {
1004 pr_crit("Cannot register socket family\n");
1005 goto error_sock;
1006 }
1007
1008 ret = register_key_type(&key_type_rxrpc);
1009 if (ret < 0) {
1010 pr_crit("Cannot register client key type\n");
1011 goto error_key_type;
1012 }
1013
1014 ret = register_key_type(&key_type_rxrpc_s);
1015 if (ret < 0) {
1016 pr_crit("Cannot register server key type\n");
1017 goto error_key_type_s;
1018 }
1019
1020 ret = rxrpc_sysctl_init();
1021 if (ret < 0) {
1022 pr_crit("Cannot register sysctls\n");
1023 goto error_sysctls;
1024 }
1025
1026 return 0;
1027
1028error_sysctls:
1029 unregister_key_type(&key_type_rxrpc_s);
1030error_key_type_s:
1031 unregister_key_type(&key_type_rxrpc);
1032error_key_type:
1033 sock_unregister(PF_RXRPC);
1034error_sock:
1035 proto_unregister(&rxrpc_proto);
1036error_proto:
1037 unregister_pernet_subsys(&rxrpc_net_ops);
1038error_pernet:
1039 rxrpc_exit_security();
1040error_security:
1041 destroy_workqueue(rxrpc_workqueue);
1042error_work_queue:
1043 kmem_cache_destroy(rxrpc_call_jar);
1044error_call_jar:
1045 return ret;
1046}
1047
1048/*
1049 * unregister the RxRPC protocol
1050 */
1051static void __exit af_rxrpc_exit(void)
1052{
1053 _enter("");
1054 rxrpc_sysctl_exit();
1055 unregister_key_type(&key_type_rxrpc_s);
1056 unregister_key_type(&key_type_rxrpc);
1057 sock_unregister(PF_RXRPC);
1058 proto_unregister(&rxrpc_proto);
1059 unregister_pernet_subsys(&rxrpc_net_ops);
1060 ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
1061 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1062
1063 /* Make sure the local and peer records pinned by any dying connections
1064 * are released.
1065 */
1066 rcu_barrier();
1067 rxrpc_destroy_client_conn_ids();
1068
1069 destroy_workqueue(rxrpc_workqueue);
1070 rxrpc_exit_security();
1071 kmem_cache_destroy(rxrpc_call_jar);
1072 _leave("");
1073}
1074
1075module_init(af_rxrpc_init);
1076module_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/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
25MODULE_DESCRIPTION("RxRPC network protocol");
26MODULE_AUTHOR("Red Hat, Inc.");
27MODULE_LICENSE("GPL");
28MODULE_ALIAS_NETPROTO(PF_RXRPC);
29
30unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
31module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
32MODULE_PARM_DESC(debug, "RxRPC debugging mask");
33
34static int sysctl_rxrpc_max_qlen __read_mostly = 10;
35
36static struct proto rxrpc_proto;
37static const struct proto_ops rxrpc_rpc_ops;
38
39/* local epoch for detecting local-end reset */
40u32 rxrpc_epoch;
41
42/* current debugging ID */
43atomic_t rxrpc_debug_id;
44
45/* count of skbs currently in use */
46atomic_t rxrpc_n_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 atomic_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->proto)
101 return -EAFNOSUPPORT;
102
103 switch (srx->transport.family) {
104 case AF_INET:
105 _debug("INET: %x @ %pI4",
106 ntohs(srx->transport.sin.sin_port),
107 &srx->transport.sin.sin_addr);
108 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
109 break;
110
111 case AF_INET6:
112 default:
113 return -EAFNOSUPPORT;
114 }
115
116 if (tail < len)
117 memset((void *)srx + tail, 0, len - tail);
118 return 0;
119}
120
121/*
122 * bind a local address to an RxRPC socket
123 */
124static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
125{
126 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
127 struct sock *sk = sock->sk;
128 struct rxrpc_local *local;
129 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
130 int ret;
131
132 _enter("%p,%p,%d", rx, saddr, len);
133
134 ret = rxrpc_validate_address(rx, srx, len);
135 if (ret < 0)
136 goto error;
137
138 lock_sock(&rx->sk);
139
140 if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
141 ret = -EINVAL;
142 goto error_unlock;
143 }
144
145 memcpy(&rx->srx, srx, sizeof(rx->srx));
146
147 /* Find or create a local transport endpoint to use */
148 local = rxrpc_lookup_local(&rx->srx);
149 if (IS_ERR(local)) {
150 ret = PTR_ERR(local);
151 goto error_unlock;
152 }
153
154 rx->local = local;
155 if (srx->srx_service) {
156 write_lock_bh(&local->services_lock);
157 list_for_each_entry(prx, &local->services, listen_link) {
158 if (prx->srx.srx_service == srx->srx_service)
159 goto service_in_use;
160 }
161
162 list_add_tail(&rx->listen_link, &local->services);
163 write_unlock_bh(&local->services_lock);
164
165 rx->sk.sk_state = RXRPC_SERVER_BOUND;
166 } else {
167 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
168 }
169
170 release_sock(&rx->sk);
171 _leave(" = 0");
172 return 0;
173
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
279 _enter(",,%x,%lx", key_serial(key), user_call_ID);
280
281 lock_sock(&rx->sk);
282
283 if (srx) {
284 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
285 sizeof(*srx), 0, gfp);
286 if (IS_ERR(trans)) {
287 call = ERR_CAST(trans);
288 trans = NULL;
289 goto out_notrans;
290 }
291 } else {
292 trans = rx->trans;
293 if (!trans) {
294 call = ERR_PTR(-ENOTCONN);
295 goto out_notrans;
296 }
297 atomic_inc(&trans->usage);
298 }
299
300 if (!srx)
301 srx = &rx->srx;
302 if (!key)
303 key = rx->key;
304 if (key && !key->payload.data[0])
305 key = NULL; /* a no-security key */
306
307 bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp);
308 if (IS_ERR(bundle)) {
309 call = ERR_CAST(bundle);
310 goto out;
311 }
312
313 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
314 gfp);
315 rxrpc_put_bundle(trans, bundle);
316out:
317 rxrpc_put_transport(trans);
318out_notrans:
319 release_sock(&rx->sk);
320 _leave(" = %p", call);
321 return call;
322}
323EXPORT_SYMBOL(rxrpc_kernel_begin_call);
324
325/**
326 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
327 * @call: The call to end
328 *
329 * Allow a kernel service to end a call it was using. The call must be
330 * complete before this is called (the call should be aborted if necessary).
331 */
332void rxrpc_kernel_end_call(struct rxrpc_call *call)
333{
334 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
335 rxrpc_remove_user_ID(call->socket, call);
336 rxrpc_put_call(call);
337}
338EXPORT_SYMBOL(rxrpc_kernel_end_call);
339
340/**
341 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
342 * @sock: The socket to intercept received messages on
343 * @interceptor: The function to pass the messages to
344 *
345 * Allow a kernel service to intercept messages heading for the Rx queue on an
346 * RxRPC socket. They get passed to the specified function instead.
347 * @interceptor should free the socket buffers it is given. @interceptor is
348 * called with the socket receive queue spinlock held and softirqs disabled -
349 * this ensures that the messages will be delivered in the right order.
350 */
351void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
352 rxrpc_interceptor_t interceptor)
353{
354 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
355
356 _enter("");
357 rx->interceptor = interceptor;
358}
359
360EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
361
362/*
363 * connect an RxRPC socket
364 * - this just targets it at a specific destination; no actual connection
365 * negotiation takes place
366 */
367static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
368 int addr_len, int flags)
369{
370 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
371 struct sock *sk = sock->sk;
372 struct rxrpc_transport *trans;
373 struct rxrpc_local *local;
374 struct rxrpc_sock *rx = rxrpc_sk(sk);
375 int ret;
376
377 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
378
379 ret = rxrpc_validate_address(rx, srx, addr_len);
380 if (ret < 0) {
381 _leave(" = %d [bad addr]", ret);
382 return ret;
383 }
384
385 lock_sock(&rx->sk);
386
387 switch (rx->sk.sk_state) {
388 case RXRPC_UNCONNECTED:
389 /* find a local transport endpoint if we don't have one already */
390 ASSERTCMP(rx->local, ==, NULL);
391 rx->srx.srx_family = AF_RXRPC;
392 rx->srx.srx_service = 0;
393 rx->srx.transport_type = srx->transport_type;
394 rx->srx.transport_len = sizeof(sa_family_t);
395 rx->srx.transport.family = srx->transport.family;
396 local = rxrpc_lookup_local(&rx->srx);
397 if (IS_ERR(local)) {
398 release_sock(&rx->sk);
399 return PTR_ERR(local);
400 }
401 rx->local = local;
402 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
403 case RXRPC_CLIENT_BOUND:
404 break;
405 case RXRPC_CLIENT_CONNECTED:
406 release_sock(&rx->sk);
407 return -EISCONN;
408 default:
409 release_sock(&rx->sk);
410 return -EBUSY; /* server sockets can't connect as well */
411 }
412
413 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
414 GFP_KERNEL);
415 if (IS_ERR(trans)) {
416 release_sock(&rx->sk);
417 _leave(" = %ld", PTR_ERR(trans));
418 return PTR_ERR(trans);
419 }
420
421 rx->trans = trans;
422 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
423
424 release_sock(&rx->sk);
425 return 0;
426}
427
428/*
429 * send a message through an RxRPC socket
430 * - in a client this does a number of things:
431 * - finds/sets up a connection for the security specified (if any)
432 * - initiates a call (ID in control data)
433 * - ends the request phase of a call (if MSG_MORE is not set)
434 * - sends a call data packet
435 * - may send an abort (abort code in control data)
436 */
437static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
438{
439 struct rxrpc_transport *trans;
440 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
441 int ret;
442
443 _enter(",{%d},,%zu", rx->sk.sk_state, len);
444
445 if (m->msg_flags & MSG_OOB)
446 return -EOPNOTSUPP;
447
448 if (m->msg_name) {
449 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
450 if (ret < 0) {
451 _leave(" = %d [bad addr]", ret);
452 return ret;
453 }
454 }
455
456 trans = NULL;
457 lock_sock(&rx->sk);
458
459 if (m->msg_name) {
460 ret = -EISCONN;
461 trans = rxrpc_name_to_transport(sock, m->msg_name,
462 m->msg_namelen, 0, GFP_KERNEL);
463 if (IS_ERR(trans)) {
464 ret = PTR_ERR(trans);
465 trans = NULL;
466 goto out;
467 }
468 } else {
469 trans = rx->trans;
470 if (trans)
471 atomic_inc(&trans->usage);
472 }
473
474 switch (rx->sk.sk_state) {
475 case RXRPC_SERVER_LISTENING:
476 if (!m->msg_name) {
477 ret = rxrpc_server_sendmsg(rx, m, len);
478 break;
479 }
480 case RXRPC_SERVER_BOUND:
481 case RXRPC_CLIENT_BOUND:
482 if (!m->msg_name) {
483 ret = -ENOTCONN;
484 break;
485 }
486 case RXRPC_CLIENT_CONNECTED:
487 ret = rxrpc_client_sendmsg(rx, trans, m, len);
488 break;
489 default:
490 ret = -ENOTCONN;
491 break;
492 }
493
494out:
495 release_sock(&rx->sk);
496 if (trans)
497 rxrpc_put_transport(trans);
498 _leave(" = %d", ret);
499 return ret;
500}
501
502/*
503 * set RxRPC socket options
504 */
505static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
506 char __user *optval, unsigned int optlen)
507{
508 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
509 unsigned int min_sec_level;
510 int ret;
511
512 _enter(",%d,%d,,%d", level, optname, optlen);
513
514 lock_sock(&rx->sk);
515 ret = -EOPNOTSUPP;
516
517 if (level == SOL_RXRPC) {
518 switch (optname) {
519 case RXRPC_EXCLUSIVE_CONNECTION:
520 ret = -EINVAL;
521 if (optlen != 0)
522 goto error;
523 ret = -EISCONN;
524 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
525 goto error;
526 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
527 goto success;
528
529 case RXRPC_SECURITY_KEY:
530 ret = -EINVAL;
531 if (rx->key)
532 goto error;
533 ret = -EISCONN;
534 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
535 goto error;
536 ret = rxrpc_request_key(rx, optval, optlen);
537 goto error;
538
539 case RXRPC_SECURITY_KEYRING:
540 ret = -EINVAL;
541 if (rx->key)
542 goto error;
543 ret = -EISCONN;
544 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
545 goto error;
546 ret = rxrpc_server_keyring(rx, optval, optlen);
547 goto error;
548
549 case RXRPC_MIN_SECURITY_LEVEL:
550 ret = -EINVAL;
551 if (optlen != sizeof(unsigned int))
552 goto error;
553 ret = -EISCONN;
554 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
555 goto error;
556 ret = get_user(min_sec_level,
557 (unsigned int __user *) optval);
558 if (ret < 0)
559 goto error;
560 ret = -EINVAL;
561 if (min_sec_level > RXRPC_SECURITY_MAX)
562 goto error;
563 rx->min_sec_level = min_sec_level;
564 goto success;
565
566 default:
567 break;
568 }
569 }
570
571success:
572 ret = 0;
573error:
574 release_sock(&rx->sk);
575 return ret;
576}
577
578/*
579 * permit an RxRPC socket to be polled
580 */
581static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
582 poll_table *wait)
583{
584 unsigned int mask;
585 struct sock *sk = sock->sk;
586
587 sock_poll_wait(file, sk_sleep(sk), wait);
588 mask = 0;
589
590 /* the socket is readable if there are any messages waiting on the Rx
591 * queue */
592 if (!skb_queue_empty(&sk->sk_receive_queue))
593 mask |= POLLIN | POLLRDNORM;
594
595 /* the socket is writable if there is space to add new data to the
596 * socket; there is no guarantee that any particular call in progress
597 * on the socket may have space in the Tx ACK window */
598 if (rxrpc_writable(sk))
599 mask |= POLLOUT | POLLWRNORM;
600
601 return mask;
602}
603
604/*
605 * create an RxRPC socket
606 */
607static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
608 int kern)
609{
610 struct rxrpc_sock *rx;
611 struct sock *sk;
612
613 _enter("%p,%d", sock, protocol);
614
615 if (!net_eq(net, &init_net))
616 return -EAFNOSUPPORT;
617
618 /* we support transport protocol UDP/UDP6 only */
619 if (protocol != PF_INET)
620 return -EPROTONOSUPPORT;
621
622 if (sock->type != SOCK_DGRAM)
623 return -ESOCKTNOSUPPORT;
624
625 sock->ops = &rxrpc_rpc_ops;
626 sock->state = SS_UNCONNECTED;
627
628 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
629 if (!sk)
630 return -ENOMEM;
631
632 sock_init_data(sock, sk);
633 sk->sk_state = RXRPC_UNCONNECTED;
634 sk->sk_write_space = rxrpc_write_space;
635 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
636 sk->sk_destruct = rxrpc_sock_destructor;
637
638 rx = rxrpc_sk(sk);
639 rx->proto = protocol;
640 rx->calls = RB_ROOT;
641
642 INIT_LIST_HEAD(&rx->listen_link);
643 INIT_LIST_HEAD(&rx->secureq);
644 INIT_LIST_HEAD(&rx->acceptq);
645 rwlock_init(&rx->call_lock);
646 memset(&rx->srx, 0, sizeof(rx->srx));
647
648 _leave(" = 0 [%p]", rx);
649 return 0;
650}
651
652/*
653 * RxRPC socket destructor
654 */
655static void rxrpc_sock_destructor(struct sock *sk)
656{
657 _enter("%p", sk);
658
659 rxrpc_purge_queue(&sk->sk_receive_queue);
660
661 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
662 WARN_ON(!sk_unhashed(sk));
663 WARN_ON(sk->sk_socket);
664
665 if (!sock_flag(sk, SOCK_DEAD)) {
666 printk("Attempt to release alive rxrpc socket: %p\n", sk);
667 return;
668 }
669}
670
671/*
672 * release an RxRPC socket
673 */
674static int rxrpc_release_sock(struct sock *sk)
675{
676 struct rxrpc_sock *rx = rxrpc_sk(sk);
677
678 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
679
680 /* declare the socket closed for business */
681 sock_orphan(sk);
682 sk->sk_shutdown = SHUTDOWN_MASK;
683
684 spin_lock_bh(&sk->sk_receive_queue.lock);
685 sk->sk_state = RXRPC_CLOSE;
686 spin_unlock_bh(&sk->sk_receive_queue.lock);
687
688 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
689
690 if (!list_empty(&rx->listen_link)) {
691 write_lock_bh(&rx->local->services_lock);
692 list_del(&rx->listen_link);
693 write_unlock_bh(&rx->local->services_lock);
694 }
695
696 /* try to flush out this socket */
697 rxrpc_release_calls_on_socket(rx);
698 flush_workqueue(rxrpc_workqueue);
699 rxrpc_purge_queue(&sk->sk_receive_queue);
700
701 if (rx->conn) {
702 rxrpc_put_connection(rx->conn);
703 rx->conn = NULL;
704 }
705
706 if (rx->bundle) {
707 rxrpc_put_bundle(rx->trans, rx->bundle);
708 rx->bundle = NULL;
709 }
710 if (rx->trans) {
711 rxrpc_put_transport(rx->trans);
712 rx->trans = NULL;
713 }
714 if (rx->local) {
715 rxrpc_put_local(rx->local);
716 rx->local = NULL;
717 }
718
719 key_put(rx->key);
720 rx->key = NULL;
721 key_put(rx->securities);
722 rx->securities = NULL;
723 sock_put(sk);
724
725 _leave(" = 0");
726 return 0;
727}
728
729/*
730 * release an RxRPC BSD socket on close() or equivalent
731 */
732static int rxrpc_release(struct socket *sock)
733{
734 struct sock *sk = sock->sk;
735
736 _enter("%p{%p}", sock, sk);
737
738 if (!sk)
739 return 0;
740
741 sock->sk = NULL;
742
743 return rxrpc_release_sock(sk);
744}
745
746/*
747 * RxRPC network protocol
748 */
749static const struct proto_ops rxrpc_rpc_ops = {
750 .family = PF_RXRPC,
751 .owner = THIS_MODULE,
752 .release = rxrpc_release,
753 .bind = rxrpc_bind,
754 .connect = rxrpc_connect,
755 .socketpair = sock_no_socketpair,
756 .accept = sock_no_accept,
757 .getname = sock_no_getname,
758 .poll = rxrpc_poll,
759 .ioctl = sock_no_ioctl,
760 .listen = rxrpc_listen,
761 .shutdown = sock_no_shutdown,
762 .setsockopt = rxrpc_setsockopt,
763 .getsockopt = sock_no_getsockopt,
764 .sendmsg = rxrpc_sendmsg,
765 .recvmsg = rxrpc_recvmsg,
766 .mmap = sock_no_mmap,
767 .sendpage = sock_no_sendpage,
768};
769
770static struct proto rxrpc_proto = {
771 .name = "RXRPC",
772 .owner = THIS_MODULE,
773 .obj_size = sizeof(struct rxrpc_sock),
774 .max_header = sizeof(struct rxrpc_wire_header),
775};
776
777static const struct net_proto_family rxrpc_family_ops = {
778 .family = PF_RXRPC,
779 .create = rxrpc_create,
780 .owner = THIS_MODULE,
781};
782
783/*
784 * initialise and register the RxRPC protocol
785 */
786static int __init af_rxrpc_init(void)
787{
788 int ret = -1;
789
790 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
791
792 rxrpc_epoch = get_seconds();
793
794 ret = -ENOMEM;
795 rxrpc_call_jar = kmem_cache_create(
796 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
797 SLAB_HWCACHE_ALIGN, NULL);
798 if (!rxrpc_call_jar) {
799 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
800 goto error_call_jar;
801 }
802
803 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
804 if (!rxrpc_workqueue) {
805 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
806 goto error_work_queue;
807 }
808
809 ret = proto_register(&rxrpc_proto, 1);
810 if (ret < 0) {
811 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
812 goto error_proto;
813 }
814
815 ret = sock_register(&rxrpc_family_ops);
816 if (ret < 0) {
817 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
818 goto error_sock;
819 }
820
821 ret = register_key_type(&key_type_rxrpc);
822 if (ret < 0) {
823 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
824 goto error_key_type;
825 }
826
827 ret = register_key_type(&key_type_rxrpc_s);
828 if (ret < 0) {
829 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
830 goto error_key_type_s;
831 }
832
833 ret = rxrpc_sysctl_init();
834 if (ret < 0) {
835 printk(KERN_CRIT "RxRPC: Cannot register sysctls\n");
836 goto error_sysctls;
837 }
838
839#ifdef CONFIG_PROC_FS
840 proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
841 proc_create("rxrpc_conns", 0, init_net.proc_net,
842 &rxrpc_connection_seq_fops);
843#endif
844 return 0;
845
846error_sysctls:
847 unregister_key_type(&key_type_rxrpc_s);
848error_key_type_s:
849 unregister_key_type(&key_type_rxrpc);
850error_key_type:
851 sock_unregister(PF_RXRPC);
852error_sock:
853 proto_unregister(&rxrpc_proto);
854error_proto:
855 destroy_workqueue(rxrpc_workqueue);
856error_work_queue:
857 kmem_cache_destroy(rxrpc_call_jar);
858error_call_jar:
859 return ret;
860}
861
862/*
863 * unregister the RxRPC protocol
864 */
865static void __exit af_rxrpc_exit(void)
866{
867 _enter("");
868 rxrpc_sysctl_exit();
869 unregister_key_type(&key_type_rxrpc_s);
870 unregister_key_type(&key_type_rxrpc);
871 sock_unregister(PF_RXRPC);
872 proto_unregister(&rxrpc_proto);
873 rxrpc_destroy_all_calls();
874 rxrpc_destroy_all_connections();
875 rxrpc_destroy_all_transports();
876 rxrpc_destroy_all_peers();
877 rxrpc_destroy_all_locals();
878
879 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
880
881 _debug("flush scheduled work");
882 flush_workqueue(rxrpc_workqueue);
883 remove_proc_entry("rxrpc_conns", init_net.proc_net);
884 remove_proc_entry("rxrpc_calls", init_net.proc_net);
885 destroy_workqueue(rxrpc_workqueue);
886 kmem_cache_destroy(rxrpc_call_jar);
887 _leave("");
888}
889
890module_init(af_rxrpc_init);
891module_exit(af_rxrpc_exit);