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