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[cor.git] / net / rxrpc / af_rxrpc.c
blobd72ddb67bb742a0f6db6db765dd0035c94f636e8
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
25 MODULE_DESCRIPTION("RxRPC network protocol");
26 MODULE_AUTHOR("Red Hat, Inc.");
27 MODULE_LICENSE("GPL");
28 MODULE_ALIAS_NETPROTO(PF_RXRPC);
29
30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
31 module_param_named(debug, rxrpc_debug, uint, 0644);
32 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
33
34 static struct proto rxrpc_proto;
35 static const struct proto_ops rxrpc_rpc_ops;
36
37 /* current debugging ID */
38 atomic_t rxrpc_debug_id;
39 EXPORT_SYMBOL(rxrpc_debug_id);
40
41 /* count of skbs currently in use */
42 atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
43
44 struct workqueue_struct *rxrpc_workqueue;
45
46 static void rxrpc_sock_destructor(struct sock *);
47
48 /*
49 * see if an RxRPC socket is currently writable
50 */
51 static 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 */
59 static 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 */
76 static 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 */
129 static 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
194 service_in_use:
195 write_unlock(&local->services_lock);
196 rxrpc_unuse_local(local);
197 ret = -EADDRINUSE;
198 error_unlock:
199 release_sock(&rx->sk);
200 error:
201 _leave(" = %d", ret);
202 return ret;
203 }
204
205 /*
206 * set the number of pending calls permitted on a listening socket
207 */
208 static int rxrpc_listen(struct socket *sock, int backlog)
209 {
210 struct sock *sk = sock->sk;
211 struct rxrpc_sock *rx = rxrpc_sk(sk);
212 unsigned int max, old;
213 int ret;
214
215 _enter("%p,%d", rx, backlog);
216
217 lock_sock(&rx->sk);
218
219 switch (rx->sk.sk_state) {
220 case RXRPC_UNBOUND:
221 ret = -EADDRNOTAVAIL;
222 break;
223 case RXRPC_SERVER_BOUND:
224 case RXRPC_SERVER_BOUND2:
225 ASSERT(rx->local != NULL);
226 max = READ_ONCE(rxrpc_max_backlog);
227 ret = -EINVAL;
228 if (backlog == INT_MAX)
229 backlog = max;
230 else if (backlog < 0 || backlog > max)
231 break;
232 old = sk->sk_max_ack_backlog;
233 sk->sk_max_ack_backlog = backlog;
234 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
235 if (ret == 0)
236 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
237 else
238 sk->sk_max_ack_backlog = old;
239 break;
240 case RXRPC_SERVER_LISTENING:
241 if (backlog == 0) {
242 rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
243 sk->sk_max_ack_backlog = 0;
244 rxrpc_discard_prealloc(rx);
245 ret = 0;
246 break;
247 }
248 /* Fall through */
249 default:
250 ret = -EBUSY;
251 break;
252 }
253
254 release_sock(&rx->sk);
255 _leave(" = %d", ret);
256 return ret;
257 }
258
259 /**
260 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
261 * @sock: The socket on which to make the call
262 * @srx: The address of the peer to contact
263 * @key: The security context to use (defaults to socket setting)
264 * @user_call_ID: The ID to use
265 * @tx_total_len: Total length of data to transmit during the call (or -1)
266 * @gfp: The allocation constraints
267 * @notify_rx: Where to send notifications instead of socket queue
268 * @upgrade: Request service upgrade for call
269 * @intr: The call is interruptible
270 * @debug_id: The debug ID for tracing to be assigned to the call
271 *
272 * Allow a kernel service to begin a call on the nominated socket. This just
273 * sets up all the internal tracking structures and allocates connection and
274 * call IDs as appropriate. The call to be used is returned.
275 *
276 * The default socket destination address and security may be overridden by
277 * supplying @srx and @key.
278 */
279 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
280 struct sockaddr_rxrpc *srx,
281 struct key *key,
282 unsigned long user_call_ID,
283 s64 tx_total_len,
284 gfp_t gfp,
285 rxrpc_notify_rx_t notify_rx,
286 bool upgrade,
287 bool intr,
288 unsigned int debug_id)
289 {
290 struct rxrpc_conn_parameters cp;
291 struct rxrpc_call_params p;
292 struct rxrpc_call *call;
293 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
294 int ret;
295
296 _enter(",,%x,%lx", key_serial(key), user_call_ID);
297
298 ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
299 if (ret < 0)
300 return ERR_PTR(ret);
301
302 lock_sock(&rx->sk);
303
304 if (!key)
305 key = rx->key;
306 if (key && !key->payload.data[0])
307 key = NULL; /* a no-security key */
308
309 memset(&p, 0, sizeof(p));
310 p.user_call_ID = user_call_ID;
311 p.tx_total_len = tx_total_len;
312 p.intr = intr;
313
314 memset(&cp, 0, sizeof(cp));
315 cp.local = rx->local;
316 cp.key = key;
317 cp.security_level = rx->min_sec_level;
318 cp.exclusive = false;
319 cp.upgrade = upgrade;
320 cp.service_id = srx->srx_service;
321 call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id);
322 /* The socket has been unlocked. */
323 if (!IS_ERR(call)) {
324 call->notify_rx = notify_rx;
325 mutex_unlock(&call->user_mutex);
326 }
327
328 rxrpc_put_peer(cp.peer);
329 _leave(" = %p", call);
330 return call;
331 }
332 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
333
334 /*
335 * Dummy function used to stop the notifier talking to recvmsg().
336 */
337 static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
338 unsigned long call_user_ID)
339 {
340 }
341
342 /**
343 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
344 * @sock: The socket the call is on
345 * @call: The call to end
346 *
347 * Allow a kernel service to end a call it was using. The call must be
348 * complete before this is called (the call should be aborted if necessary).
349 */
350 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
351 {
352 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
353
354 mutex_lock(&call->user_mutex);
355 rxrpc_release_call(rxrpc_sk(sock->sk), call);
356
357 /* Make sure we're not going to call back into a kernel service */
358 if (call->notify_rx) {
359 spin_lock_bh(&call->notify_lock);
360 call->notify_rx = rxrpc_dummy_notify_rx;
361 spin_unlock_bh(&call->notify_lock);
362 }
363
364 mutex_unlock(&call->user_mutex);
365 rxrpc_put_call(call, rxrpc_call_put_kernel);
366 }
367 EXPORT_SYMBOL(rxrpc_kernel_end_call);
368
369 /**
370 * rxrpc_kernel_check_life - Check to see whether a call is still alive
371 * @sock: The socket the call is on
372 * @call: The call to check
373 * @_life: Where to store the life value
374 *
375 * Allow a kernel service to find out whether a call is still alive - ie. we're
376 * getting ACKs from the server. Passes back in *_life a number representing
377 * the life state which can be compared to that returned by a previous call and
378 * return true if the call is still alive.
379 *
380 * If the life state stalls, rxrpc_kernel_probe_life() should be called and
381 * then 2RTT waited.
382 */
383 bool rxrpc_kernel_check_life(const struct socket *sock,
384 const struct rxrpc_call *call,
385 u32 *_life)
386 {
387 *_life = call->acks_latest;
388 return call->state != RXRPC_CALL_COMPLETE;
389 }
390 EXPORT_SYMBOL(rxrpc_kernel_check_life);
391
392 /**
393 * rxrpc_kernel_probe_life - Poke the peer to see if it's still alive
394 * @sock: The socket the call is on
395 * @call: The call to check
396 *
397 * In conjunction with rxrpc_kernel_check_life(), allow a kernel service to
398 * find out whether a call is still alive by pinging it. This should cause the
399 * life state to be bumped in about 2*RTT.
400 *
401 * The must be called in TASK_RUNNING state on pain of might_sleep() objecting.
402 */
403 void rxrpc_kernel_probe_life(struct socket *sock, struct rxrpc_call *call)
404 {
405 rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, true, false,
406 rxrpc_propose_ack_ping_for_check_life);
407 rxrpc_send_ack_packet(call, true, NULL);
408 }
409 EXPORT_SYMBOL(rxrpc_kernel_probe_life);
410
411 /**
412 * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
413 * @sock: The socket the call is on
414 * @call: The call to query
415 *
416 * Allow a kernel service to retrieve the epoch value from a service call to
417 * see if the client at the other end rebooted.
418 */
419 u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
420 {
421 return call->conn->proto.epoch;
422 }
423 EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
424
425 /**
426 * rxrpc_kernel_new_call_notification - Get notifications of new calls
427 * @sock: The socket to intercept received messages on
428 * @notify_new_call: Function to be called when new calls appear
429 * @discard_new_call: Function to discard preallocated calls
430 *
431 * Allow a kernel service to be given notifications about new calls.
432 */
433 void rxrpc_kernel_new_call_notification(
434 struct socket *sock,
435 rxrpc_notify_new_call_t notify_new_call,
436 rxrpc_discard_new_call_t discard_new_call)
437 {
438 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
439
440 rx->notify_new_call = notify_new_call;
441 rx->discard_new_call = discard_new_call;
442 }
443 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
444
445 /**
446 * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
447 * @sock: The socket the call is on
448 * @call: The call to configure
449 * @hard_timeout: The maximum lifespan of the call in jiffies
450 *
451 * Set the maximum lifespan of a call. The call will end with ETIME or
452 * ETIMEDOUT if it takes longer than this.
453 */
454 void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
455 unsigned long hard_timeout)
456 {
457 unsigned long now;
458
459 mutex_lock(&call->user_mutex);
460
461 now = jiffies;
462 hard_timeout += now;
463 WRITE_ONCE(call->expect_term_by, hard_timeout);
464 rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
465
466 mutex_unlock(&call->user_mutex);
467 }
468 EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
469
470 /*
471 * connect an RxRPC socket
472 * - this just targets it at a specific destination; no actual connection
473 * negotiation takes place
474 */
475 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
476 int addr_len, int flags)
477 {
478 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
479 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
480 int ret;
481
482 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
483
484 ret = rxrpc_validate_address(rx, srx, addr_len);
485 if (ret < 0) {
486 _leave(" = %d [bad addr]", ret);
487 return ret;
488 }
489
490 lock_sock(&rx->sk);
491
492 ret = -EISCONN;
493 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
494 goto error;
495
496 switch (rx->sk.sk_state) {
497 case RXRPC_UNBOUND:
498 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
499 case RXRPC_CLIENT_UNBOUND:
500 case RXRPC_CLIENT_BOUND:
501 break;
502 default:
503 ret = -EBUSY;
504 goto error;
505 }
506
507 rx->connect_srx = *srx;
508 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
509 ret = 0;
510
511 error:
512 release_sock(&rx->sk);
513 return ret;
514 }
515
516 /*
517 * send a message through an RxRPC socket
518 * - in a client this does a number of things:
519 * - finds/sets up a connection for the security specified (if any)
520 * - initiates a call (ID in control data)
521 * - ends the request phase of a call (if MSG_MORE is not set)
522 * - sends a call data packet
523 * - may send an abort (abort code in control data)
524 */
525 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
526 {
527 struct rxrpc_local *local;
528 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
529 int ret;
530
531 _enter(",{%d},,%zu", rx->sk.sk_state, len);
532
533 if (m->msg_flags & MSG_OOB)
534 return -EOPNOTSUPP;
535
536 if (m->msg_name) {
537 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
538 if (ret < 0) {
539 _leave(" = %d [bad addr]", ret);
540 return ret;
541 }
542 }
543
544 lock_sock(&rx->sk);
545
546 switch (rx->sk.sk_state) {
547 case RXRPC_UNBOUND:
548 case RXRPC_CLIENT_UNBOUND:
549 rx->srx.srx_family = AF_RXRPC;
550 rx->srx.srx_service = 0;
551 rx->srx.transport_type = SOCK_DGRAM;
552 rx->srx.transport.family = rx->family;
553 switch (rx->family) {
554 case AF_INET:
555 rx->srx.transport_len = sizeof(struct sockaddr_in);
556 break;
557 #ifdef CONFIG_AF_RXRPC_IPV6
558 case AF_INET6:
559 rx->srx.transport_len = sizeof(struct sockaddr_in6);
560 break;
561 #endif
562 default:
563 ret = -EAFNOSUPPORT;
564 goto error_unlock;
565 }
566 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
567 if (IS_ERR(local)) {
568 ret = PTR_ERR(local);
569 goto error_unlock;
570 }
571
572 rx->local = local;
573 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
574 /* Fall through */
575
576 case RXRPC_CLIENT_BOUND:
577 if (!m->msg_name &&
578 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
579 m->msg_name = &rx->connect_srx;
580 m->msg_namelen = sizeof(rx->connect_srx);
581 }
582 /* Fall through */
583 case RXRPC_SERVER_BOUND:
584 case RXRPC_SERVER_LISTENING:
585 ret = rxrpc_do_sendmsg(rx, m, len);
586 /* The socket has been unlocked */
587 goto out;
588 default:
589 ret = -EINVAL;
590 goto error_unlock;
591 }
592
593 error_unlock:
594 release_sock(&rx->sk);
595 out:
596 _leave(" = %d", ret);
597 return ret;
598 }
599
600 /*
601 * set RxRPC socket options
602 */
603 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
604 char __user *optval, unsigned int optlen)
605 {
606 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
607 unsigned int min_sec_level;
608 u16 service_upgrade[2];
609 int ret;
610
611 _enter(",%d,%d,,%d", level, optname, optlen);
612
613 lock_sock(&rx->sk);
614 ret = -EOPNOTSUPP;
615
616 if (level == SOL_RXRPC) {
617 switch (optname) {
618 case RXRPC_EXCLUSIVE_CONNECTION:
619 ret = -EINVAL;
620 if (optlen != 0)
621 goto error;
622 ret = -EISCONN;
623 if (rx->sk.sk_state != RXRPC_UNBOUND)
624 goto error;
625 rx->exclusive = true;
626 goto success;
627
628 case RXRPC_SECURITY_KEY:
629 ret = -EINVAL;
630 if (rx->key)
631 goto error;
632 ret = -EISCONN;
633 if (rx->sk.sk_state != RXRPC_UNBOUND)
634 goto error;
635 ret = rxrpc_request_key(rx, optval, optlen);
636 goto error;
637
638 case RXRPC_SECURITY_KEYRING:
639 ret = -EINVAL;
640 if (rx->key)
641 goto error;
642 ret = -EISCONN;
643 if (rx->sk.sk_state != RXRPC_UNBOUND)
644 goto error;
645 ret = rxrpc_server_keyring(rx, optval, optlen);
646 goto error;
647
648 case RXRPC_MIN_SECURITY_LEVEL:
649 ret = -EINVAL;
650 if (optlen != sizeof(unsigned int))
651 goto error;
652 ret = -EISCONN;
653 if (rx->sk.sk_state != RXRPC_UNBOUND)
654 goto error;
655 ret = get_user(min_sec_level,
656 (unsigned int __user *) optval);
657 if (ret < 0)
658 goto error;
659 ret = -EINVAL;
660 if (min_sec_level > RXRPC_SECURITY_MAX)
661 goto error;
662 rx->min_sec_level = min_sec_level;
663 goto success;
664
665 case RXRPC_UPGRADEABLE_SERVICE:
666 ret = -EINVAL;
667 if (optlen != sizeof(service_upgrade) ||
668 rx->service_upgrade.from != 0)
669 goto error;
670 ret = -EISCONN;
671 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
672 goto error;
673 ret = -EFAULT;
674 if (copy_from_user(service_upgrade, optval,
675 sizeof(service_upgrade)) != 0)
676 goto error;
677 ret = -EINVAL;
678 if ((service_upgrade[0] != rx->srx.srx_service ||
679 service_upgrade[1] != rx->second_service) &&
680 (service_upgrade[0] != rx->second_service ||
681 service_upgrade[1] != rx->srx.srx_service))
682 goto error;
683 rx->service_upgrade.from = service_upgrade[0];
684 rx->service_upgrade.to = service_upgrade[1];
685 goto success;
686
687 default:
688 break;
689 }
690 }
691
692 success:
693 ret = 0;
694 error:
695 release_sock(&rx->sk);
696 return ret;
697 }
698
699 /*
700 * Get socket options.
701 */
702 static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
703 char __user *optval, int __user *_optlen)
704 {
705 int optlen;
706
707 if (level != SOL_RXRPC)
708 return -EOPNOTSUPP;
709
710 if (get_user(optlen, _optlen))
711 return -EFAULT;
712
713 switch (optname) {
714 case RXRPC_SUPPORTED_CMSG:
715 if (optlen < sizeof(int))
716 return -ETOOSMALL;
717 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
718 put_user(sizeof(int), _optlen))
719 return -EFAULT;
720 return 0;
721
722 default:
723 return -EOPNOTSUPP;
724 }
725 }
726
727 /*
728 * permit an RxRPC socket to be polled
729 */
730 static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
731 poll_table *wait)
732 {
733 struct sock *sk = sock->sk;
734 struct rxrpc_sock *rx = rxrpc_sk(sk);
735 __poll_t mask;
736
737 sock_poll_wait(file, sock, wait);
738 mask = 0;
739
740 /* the socket is readable if there are any messages waiting on the Rx
741 * queue */
742 if (!list_empty(&rx->recvmsg_q))
743 mask |= EPOLLIN | EPOLLRDNORM;
744
745 /* the socket is writable if there is space to add new data to the
746 * socket; there is no guarantee that any particular call in progress
747 * on the socket may have space in the Tx ACK window */
748 if (rxrpc_writable(sk))
749 mask |= EPOLLOUT | EPOLLWRNORM;
750
751 return mask;
752 }
753
754 /*
755 * create an RxRPC socket
756 */
757 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
758 int kern)
759 {
760 struct rxrpc_net *rxnet;
761 struct rxrpc_sock *rx;
762 struct sock *sk;
763
764 _enter("%p,%d", sock, protocol);
765
766 /* we support transport protocol UDP/UDP6 only */
767 if (protocol != PF_INET &&
768 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
769 return -EPROTONOSUPPORT;
770
771 if (sock->type != SOCK_DGRAM)
772 return -ESOCKTNOSUPPORT;
773
774 sock->ops = &rxrpc_rpc_ops;
775 sock->state = SS_UNCONNECTED;
776
777 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
778 if (!sk)
779 return -ENOMEM;
780
781 sock_init_data(sock, sk);
782 sock_set_flag(sk, SOCK_RCU_FREE);
783 sk->sk_state = RXRPC_UNBOUND;
784 sk->sk_write_space = rxrpc_write_space;
785 sk->sk_max_ack_backlog = 0;
786 sk->sk_destruct = rxrpc_sock_destructor;
787
788 rx = rxrpc_sk(sk);
789 rx->family = protocol;
790 rx->calls = RB_ROOT;
791
792 spin_lock_init(&rx->incoming_lock);
793 INIT_LIST_HEAD(&rx->sock_calls);
794 INIT_LIST_HEAD(&rx->to_be_accepted);
795 INIT_LIST_HEAD(&rx->recvmsg_q);
796 rwlock_init(&rx->recvmsg_lock);
797 rwlock_init(&rx->call_lock);
798 memset(&rx->srx, 0, sizeof(rx->srx));
799
800 rxnet = rxrpc_net(sock_net(&rx->sk));
801 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
802
803 _leave(" = 0 [%p]", rx);
804 return 0;
805 }
806
807 /*
808 * Kill all the calls on a socket and shut it down.
809 */
810 static int rxrpc_shutdown(struct socket *sock, int flags)
811 {
812 struct sock *sk = sock->sk;
813 struct rxrpc_sock *rx = rxrpc_sk(sk);
814 int ret = 0;
815
816 _enter("%p,%d", sk, flags);
817
818 if (flags != SHUT_RDWR)
819 return -EOPNOTSUPP;
820 if (sk->sk_state == RXRPC_CLOSE)
821 return -ESHUTDOWN;
822
823 lock_sock(sk);
824
825 spin_lock_bh(&sk->sk_receive_queue.lock);
826 if (sk->sk_state < RXRPC_CLOSE) {
827 sk->sk_state = RXRPC_CLOSE;
828 sk->sk_shutdown = SHUTDOWN_MASK;
829 } else {
830 ret = -ESHUTDOWN;
831 }
832 spin_unlock_bh(&sk->sk_receive_queue.lock);
833
834 rxrpc_discard_prealloc(rx);
835
836 release_sock(sk);
837 return ret;
838 }
839
840 /*
841 * RxRPC socket destructor
842 */
843 static void rxrpc_sock_destructor(struct sock *sk)
844 {
845 _enter("%p", sk);
846
847 rxrpc_purge_queue(&sk->sk_receive_queue);
848
849 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
850 WARN_ON(!sk_unhashed(sk));
851 WARN_ON(sk->sk_socket);
852
853 if (!sock_flag(sk, SOCK_DEAD)) {
854 printk("Attempt to release alive rxrpc socket: %p\n", sk);
855 return;
856 }
857 }
858
859 /*
860 * release an RxRPC socket
861 */
862 static int rxrpc_release_sock(struct sock *sk)
863 {
864 struct rxrpc_sock *rx = rxrpc_sk(sk);
865
866 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
867
868 /* declare the socket closed for business */
869 sock_orphan(sk);
870 sk->sk_shutdown = SHUTDOWN_MASK;
871
872 /* We want to kill off all connections from a service socket
873 * as fast as possible because we can't share these; client
874 * sockets, on the other hand, can share an endpoint.
875 */
876 switch (sk->sk_state) {
877 case RXRPC_SERVER_BOUND:
878 case RXRPC_SERVER_BOUND2:
879 case RXRPC_SERVER_LISTENING:
880 case RXRPC_SERVER_LISTEN_DISABLED:
881 rx->local->service_closed = true;
882 break;
883 }
884
885 spin_lock_bh(&sk->sk_receive_queue.lock);
886 sk->sk_state = RXRPC_CLOSE;
887 spin_unlock_bh(&sk->sk_receive_queue.lock);
888
889 if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
890 write_lock(&rx->local->services_lock);
891 rcu_assign_pointer(rx->local->service, NULL);
892 write_unlock(&rx->local->services_lock);
893 }
894
895 /* try to flush out this socket */
896 rxrpc_discard_prealloc(rx);
897 rxrpc_release_calls_on_socket(rx);
898 flush_workqueue(rxrpc_workqueue);
899 rxrpc_purge_queue(&sk->sk_receive_queue);
900
901 rxrpc_unuse_local(rx->local);
902 rx->local = NULL;
903 key_put(rx->key);
904 rx->key = NULL;
905 key_put(rx->securities);
906 rx->securities = NULL;
907 sock_put(sk);
908
909 _leave(" = 0");
910 return 0;
911 }
912
913 /*
914 * release an RxRPC BSD socket on close() or equivalent
915 */
916 static int rxrpc_release(struct socket *sock)
917 {
918 struct sock *sk = sock->sk;
919
920 _enter("%p{%p}", sock, sk);
921
922 if (!sk)
923 return 0;
924
925 sock->sk = NULL;
926
927 return rxrpc_release_sock(sk);
928 }
929
930 /*
931 * RxRPC network protocol
932 */
933 static const struct proto_ops rxrpc_rpc_ops = {
934 .family = PF_RXRPC,
935 .owner = THIS_MODULE,
936 .release = rxrpc_release,
937 .bind = rxrpc_bind,
938 .connect = rxrpc_connect,
939 .socketpair = sock_no_socketpair,
940 .accept = sock_no_accept,
941 .getname = sock_no_getname,
942 .poll = rxrpc_poll,
943 .ioctl = sock_no_ioctl,
944 .listen = rxrpc_listen,
945 .shutdown = rxrpc_shutdown,
946 .setsockopt = rxrpc_setsockopt,
947 .getsockopt = rxrpc_getsockopt,
948 .sendmsg = rxrpc_sendmsg,
949 .recvmsg = rxrpc_recvmsg,
950 .mmap = sock_no_mmap,
951 .sendpage = sock_no_sendpage,
952 };
953
954 static struct proto rxrpc_proto = {
955 .name = "RXRPC",
956 .owner = THIS_MODULE,
957 .obj_size = sizeof(struct rxrpc_sock),
958 .max_header = sizeof(struct rxrpc_wire_header),
959 };
960
961 static const struct net_proto_family rxrpc_family_ops = {
962 .family = PF_RXRPC,
963 .create = rxrpc_create,
964 .owner = THIS_MODULE,
965 };
966
967 /*
968 * initialise and register the RxRPC protocol
969 */
970 static int __init af_rxrpc_init(void)
971 {
972 int ret = -1;
973 unsigned int tmp;
974
975 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
976
977 get_random_bytes(&tmp, sizeof(tmp));
978 tmp &= 0x3fffffff;
979 if (tmp == 0)
980 tmp = 1;
981 idr_set_cursor(&rxrpc_client_conn_ids, tmp);
982
983 ret = -ENOMEM;
984 rxrpc_call_jar = kmem_cache_create(
985 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
986 SLAB_HWCACHE_ALIGN, NULL);
987 if (!rxrpc_call_jar) {
988 pr_notice("Failed to allocate call jar\n");
989 goto error_call_jar;
990 }
991
992 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
993 if (!rxrpc_workqueue) {
994 pr_notice("Failed to allocate work queue\n");
995 goto error_work_queue;
996 }
997
998 ret = rxrpc_init_security();
999 if (ret < 0) {
1000 pr_crit("Cannot initialise security\n");
1001 goto error_security;
1002 }
1003
1004 ret = register_pernet_subsys(&rxrpc_net_ops);
1005 if (ret)
1006 goto error_pernet;
1007
1008 ret = proto_register(&rxrpc_proto, 1);
1009 if (ret < 0) {
1010 pr_crit("Cannot register protocol\n");
1011 goto error_proto;
1012 }
1013
1014 ret = sock_register(&rxrpc_family_ops);
1015 if (ret < 0) {
1016 pr_crit("Cannot register socket family\n");
1017 goto error_sock;
1018 }
1019
1020 ret = register_key_type(&key_type_rxrpc);
1021 if (ret < 0) {
1022 pr_crit("Cannot register client key type\n");
1023 goto error_key_type;
1024 }
1025
1026 ret = register_key_type(&key_type_rxrpc_s);
1027 if (ret < 0) {
1028 pr_crit("Cannot register server key type\n");
1029 goto error_key_type_s;
1030 }
1031
1032 ret = rxrpc_sysctl_init();
1033 if (ret < 0) {
1034 pr_crit("Cannot register sysctls\n");
1035 goto error_sysctls;
1036 }
1037
1038 return 0;
1039
1040 error_sysctls:
1041 unregister_key_type(&key_type_rxrpc_s);
1042 error_key_type_s:
1043 unregister_key_type(&key_type_rxrpc);
1044 error_key_type:
1045 sock_unregister(PF_RXRPC);
1046 error_sock:
1047 proto_unregister(&rxrpc_proto);
1048 error_proto:
1049 unregister_pernet_subsys(&rxrpc_net_ops);
1050 error_pernet:
1051 rxrpc_exit_security();
1052 error_security:
1053 destroy_workqueue(rxrpc_workqueue);
1054 error_work_queue:
1055 kmem_cache_destroy(rxrpc_call_jar);
1056 error_call_jar:
1057 return ret;
1058 }
1059
1060 /*
1061 * unregister the RxRPC protocol
1062 */
1063 static void __exit af_rxrpc_exit(void)
1064 {
1065 _enter("");
1066 rxrpc_sysctl_exit();
1067 unregister_key_type(&key_type_rxrpc_s);
1068 unregister_key_type(&key_type_rxrpc);
1069 sock_unregister(PF_RXRPC);
1070 proto_unregister(&rxrpc_proto);
1071 unregister_pernet_subsys(&rxrpc_net_ops);
1072 ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
1073 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1074
1075 /* Make sure the local and peer records pinned by any dying connections
1076 * are released.
1077 */
1078 rcu_barrier();
1079 rxrpc_destroy_client_conn_ids();
1080
1081 destroy_workqueue(rxrpc_workqueue);
1082 rxrpc_exit_security();
1083 kmem_cache_destroy(rxrpc_call_jar);
1084 _leave("");
1085 }
1086
1087 module_init(af_rxrpc_init);
1088 module_exit(af_rxrpc_exit);
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