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1/* AF_RXRPC implementation
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/net.h>
14#include <linux/slab.h>
15#include <linux/skbuff.h>
16#include <linux/poll.h>
17#include <linux/proc_fs.h>
18#include <linux/key-type.h>
19#include <net/net_namespace.h>
20#include <net/sock.h>
21#include <net/af_rxrpc.h>
22#include "ar-internal.h"
23
24MODULE_DESCRIPTION("RxRPC network protocol");
25MODULE_AUTHOR("Red Hat, Inc.");
26MODULE_LICENSE("GPL");
27MODULE_ALIAS_NETPROTO(PF_RXRPC);
28
29unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
30module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
31MODULE_PARM_DESC(debug, "RxRPC debugging mask");
32
33static int sysctl_rxrpc_max_qlen __read_mostly = 10;
34
35static struct proto rxrpc_proto;
36static const struct proto_ops rxrpc_rpc_ops;
37
38/* local epoch for detecting local-end reset */
39__be32 rxrpc_epoch;
40
41/* current debugging ID */
42atomic_t rxrpc_debug_id;
43
44/* count of skbs currently in use */
45atomic_t rxrpc_n_skbs;
46
47struct workqueue_struct *rxrpc_workqueue;
48
49static void rxrpc_sock_destructor(struct sock *);
50
51/*
52 * see if an RxRPC socket is currently writable
53 */
54static inline int rxrpc_writable(struct sock *sk)
55{
56 return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
57}
58
59/*
60 * wait for write bufferage to become available
61 */
62static void rxrpc_write_space(struct sock *sk)
63{
64 _enter("%p", sk);
65 rcu_read_lock();
66 if (rxrpc_writable(sk)) {
67 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
68
69 if (wq_has_sleeper(wq))
70 wake_up_interruptible(&wq->wait);
71 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
72 }
73 rcu_read_unlock();
74}
75
76/*
77 * validate an RxRPC address
78 */
79static int rxrpc_validate_address(struct rxrpc_sock *rx,
80 struct sockaddr_rxrpc *srx,
81 int len)
82{
83 if (len < sizeof(struct sockaddr_rxrpc))
84 return -EINVAL;
85
86 if (srx->srx_family != AF_RXRPC)
87 return -EAFNOSUPPORT;
88
89 if (srx->transport_type != SOCK_DGRAM)
90 return -ESOCKTNOSUPPORT;
91
92 len -= offsetof(struct sockaddr_rxrpc, transport);
93 if (srx->transport_len < sizeof(sa_family_t) ||
94 srx->transport_len > len)
95 return -EINVAL;
96
97 if (srx->transport.family != rx->proto)
98 return -EAFNOSUPPORT;
99
100 switch (srx->transport.family) {
101 case AF_INET:
102 _debug("INET: %x @ %pI4",
103 ntohs(srx->transport.sin.sin_port),
104 &srx->transport.sin.sin_addr);
105 if (srx->transport_len > 8)
106 memset((void *)&srx->transport + 8, 0,
107 srx->transport_len - 8);
108 break;
109
110 case AF_INET6:
111 default:
112 return -EAFNOSUPPORT;
113 }
114
115 return 0;
116}
117
118/*
119 * bind a local address to an RxRPC socket
120 */
121static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
122{
123 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
124 struct sock *sk = sock->sk;
125 struct rxrpc_local *local;
126 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
127 __be16 service_id;
128 int ret;
129
130 _enter("%p,%p,%d", rx, saddr, len);
131
132 ret = rxrpc_validate_address(rx, srx, len);
133 if (ret < 0)
134 goto error;
135
136 lock_sock(&rx->sk);
137
138 if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
139 ret = -EINVAL;
140 goto error_unlock;
141 }
142
143 memcpy(&rx->srx, srx, sizeof(rx->srx));
144
145 /* find a local transport endpoint if we don't have one already */
146 local = rxrpc_lookup_local(&rx->srx);
147 if (IS_ERR(local)) {
148 ret = PTR_ERR(local);
149 goto error_unlock;
150 }
151
152 rx->local = local;
153 if (srx->srx_service) {
154 service_id = htons(srx->srx_service);
155 write_lock_bh(&local->services_lock);
156 list_for_each_entry(prx, &local->services, listen_link) {
157 if (prx->service_id == service_id)
158 goto service_in_use;
159 }
160
161 rx->service_id = service_id;
162 list_add_tail(&rx->listen_link, &local->services);
163 write_unlock_bh(&local->services_lock);
164
165 rx->sk.sk_state = RXRPC_SERVER_BOUND;
166 } else {
167 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
168 }
169
170 release_sock(&rx->sk);
171 _leave(" = 0");
172 return 0;
173
174service_in_use:
175 ret = -EADDRINUSE;
176 write_unlock_bh(&local->services_lock);
177error_unlock:
178 release_sock(&rx->sk);
179error:
180 _leave(" = %d", ret);
181 return ret;
182}
183
184/*
185 * set the number of pending calls permitted on a listening socket
186 */
187static int rxrpc_listen(struct socket *sock, int backlog)
188{
189 struct sock *sk = sock->sk;
190 struct rxrpc_sock *rx = rxrpc_sk(sk);
191 int ret;
192
193 _enter("%p,%d", rx, backlog);
194
195 lock_sock(&rx->sk);
196
197 switch (rx->sk.sk_state) {
198 case RXRPC_UNCONNECTED:
199 ret = -EADDRNOTAVAIL;
200 break;
201 case RXRPC_CLIENT_BOUND:
202 case RXRPC_CLIENT_CONNECTED:
203 default:
204 ret = -EBUSY;
205 break;
206 case RXRPC_SERVER_BOUND:
207 ASSERT(rx->local != NULL);
208 sk->sk_max_ack_backlog = backlog;
209 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
210 ret = 0;
211 break;
212 }
213
214 release_sock(&rx->sk);
215 _leave(" = %d", ret);
216 return ret;
217}
218
219/*
220 * find a transport by address
221 */
222static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
223 struct sockaddr *addr,
224 int addr_len, int flags,
225 gfp_t gfp)
226{
227 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
228 struct rxrpc_transport *trans;
229 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
230 struct rxrpc_peer *peer;
231
232 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
233
234 ASSERT(rx->local != NULL);
235 ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
236
237 if (rx->srx.transport_type != srx->transport_type)
238 return ERR_PTR(-ESOCKTNOSUPPORT);
239 if (rx->srx.transport.family != srx->transport.family)
240 return ERR_PTR(-EAFNOSUPPORT);
241
242 /* find a remote transport endpoint from the local one */
243 peer = rxrpc_get_peer(srx, gfp);
244 if (IS_ERR(peer))
245 return ERR_CAST(peer);
246
247 /* find a transport */
248 trans = rxrpc_get_transport(rx->local, peer, gfp);
249 rxrpc_put_peer(peer);
250 _leave(" = %p", trans);
251 return trans;
252}
253
254/**
255 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
256 * @sock: The socket on which to make the call
257 * @srx: The address of the peer to contact (defaults to socket setting)
258 * @key: The security context to use (defaults to socket setting)
259 * @user_call_ID: The ID to use
260 *
261 * Allow a kernel service to begin a call on the nominated socket. This just
262 * sets up all the internal tracking structures and allocates connection and
263 * call IDs as appropriate. The call to be used is returned.
264 *
265 * The default socket destination address and security may be overridden by
266 * supplying @srx and @key.
267 */
268struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
269 struct sockaddr_rxrpc *srx,
270 struct key *key,
271 unsigned long user_call_ID,
272 gfp_t gfp)
273{
274 struct rxrpc_conn_bundle *bundle;
275 struct rxrpc_transport *trans;
276 struct rxrpc_call *call;
277 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
278 __be16 service_id;
279
280 _enter(",,%x,%lx", key_serial(key), user_call_ID);
281
282 lock_sock(&rx->sk);
283
284 if (srx) {
285 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
286 sizeof(*srx), 0, gfp);
287 if (IS_ERR(trans)) {
288 call = ERR_CAST(trans);
289 trans = NULL;
290 goto out_notrans;
291 }
292 } else {
293 trans = rx->trans;
294 if (!trans) {
295 call = ERR_PTR(-ENOTCONN);
296 goto out_notrans;
297 }
298 atomic_inc(&trans->usage);
299 }
300
301 service_id = rx->service_id;
302 if (srx)
303 service_id = htons(srx->srx_service);
304
305 if (!key)
306 key = rx->key;
307 if (key && !key->payload.data)
308 key = NULL; /* a no-security key */
309
310 bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
311 if (IS_ERR(bundle)) {
312 call = ERR_CAST(bundle);
313 goto out;
314 }
315
316 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
317 gfp);
318 rxrpc_put_bundle(trans, bundle);
319out:
320 rxrpc_put_transport(trans);
321out_notrans:
322 release_sock(&rx->sk);
323 _leave(" = %p", call);
324 return call;
325}
326
327EXPORT_SYMBOL(rxrpc_kernel_begin_call);
328
329/**
330 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
331 * @call: The call to end
332 *
333 * Allow a kernel service to end a call it was using. The call must be
334 * complete before this is called (the call should be aborted if necessary).
335 */
336void rxrpc_kernel_end_call(struct rxrpc_call *call)
337{
338 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
339 rxrpc_remove_user_ID(call->socket, call);
340 rxrpc_put_call(call);
341}
342
343EXPORT_SYMBOL(rxrpc_kernel_end_call);
344
345/**
346 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
347 * @sock: The socket to intercept received messages on
348 * @interceptor: The function to pass the messages to
349 *
350 * Allow a kernel service to intercept messages heading for the Rx queue on an
351 * RxRPC socket. They get passed to the specified function instead.
352 * @interceptor should free the socket buffers it is given. @interceptor is
353 * called with the socket receive queue spinlock held and softirqs disabled -
354 * this ensures that the messages will be delivered in the right order.
355 */
356void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
357 rxrpc_interceptor_t interceptor)
358{
359 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
360
361 _enter("");
362 rx->interceptor = interceptor;
363}
364
365EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
366
367/*
368 * connect an RxRPC socket
369 * - this just targets it at a specific destination; no actual connection
370 * negotiation takes place
371 */
372static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
373 int addr_len, int flags)
374{
375 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
376 struct sock *sk = sock->sk;
377 struct rxrpc_transport *trans;
378 struct rxrpc_local *local;
379 struct rxrpc_sock *rx = rxrpc_sk(sk);
380 int ret;
381
382 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
383
384 ret = rxrpc_validate_address(rx, srx, addr_len);
385 if (ret < 0) {
386 _leave(" = %d [bad addr]", ret);
387 return ret;
388 }
389
390 lock_sock(&rx->sk);
391
392 switch (rx->sk.sk_state) {
393 case RXRPC_UNCONNECTED:
394 /* find a local transport endpoint if we don't have one already */
395 ASSERTCMP(rx->local, ==, NULL);
396 rx->srx.srx_family = AF_RXRPC;
397 rx->srx.srx_service = 0;
398 rx->srx.transport_type = srx->transport_type;
399 rx->srx.transport_len = sizeof(sa_family_t);
400 rx->srx.transport.family = srx->transport.family;
401 local = rxrpc_lookup_local(&rx->srx);
402 if (IS_ERR(local)) {
403 release_sock(&rx->sk);
404 return PTR_ERR(local);
405 }
406 rx->local = local;
407 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
408 case RXRPC_CLIENT_BOUND:
409 break;
410 case RXRPC_CLIENT_CONNECTED:
411 release_sock(&rx->sk);
412 return -EISCONN;
413 default:
414 release_sock(&rx->sk);
415 return -EBUSY; /* server sockets can't connect as well */
416 }
417
418 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
419 GFP_KERNEL);
420 if (IS_ERR(trans)) {
421 release_sock(&rx->sk);
422 _leave(" = %ld", PTR_ERR(trans));
423 return PTR_ERR(trans);
424 }
425
426 rx->trans = trans;
427 rx->service_id = htons(srx->srx_service);
428 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
429
430 release_sock(&rx->sk);
431 return 0;
432}
433
434/*
435 * send a message through an RxRPC socket
436 * - in a client this does a number of things:
437 * - finds/sets up a connection for the security specified (if any)
438 * - initiates a call (ID in control data)
439 * - ends the request phase of a call (if MSG_MORE is not set)
440 * - sends a call data packet
441 * - may send an abort (abort code in control data)
442 */
443static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
444 struct msghdr *m, size_t len)
445{
446 struct rxrpc_transport *trans;
447 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
448 int ret;
449
450 _enter(",{%d},,%zu", rx->sk.sk_state, len);
451
452 if (m->msg_flags & MSG_OOB)
453 return -EOPNOTSUPP;
454
455 if (m->msg_name) {
456 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
457 if (ret < 0) {
458 _leave(" = %d [bad addr]", ret);
459 return ret;
460 }
461 }
462
463 trans = NULL;
464 lock_sock(&rx->sk);
465
466 if (m->msg_name) {
467 ret = -EISCONN;
468 trans = rxrpc_name_to_transport(sock, m->msg_name,
469 m->msg_namelen, 0, GFP_KERNEL);
470 if (IS_ERR(trans)) {
471 ret = PTR_ERR(trans);
472 trans = NULL;
473 goto out;
474 }
475 } else {
476 trans = rx->trans;
477 if (trans)
478 atomic_inc(&trans->usage);
479 }
480
481 switch (rx->sk.sk_state) {
482 case RXRPC_SERVER_LISTENING:
483 if (!m->msg_name) {
484 ret = rxrpc_server_sendmsg(iocb, rx, m, len);
485 break;
486 }
487 case RXRPC_SERVER_BOUND:
488 case RXRPC_CLIENT_BOUND:
489 if (!m->msg_name) {
490 ret = -ENOTCONN;
491 break;
492 }
493 case RXRPC_CLIENT_CONNECTED:
494 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
495 break;
496 default:
497 ret = -ENOTCONN;
498 break;
499 }
500
501out:
502 release_sock(&rx->sk);
503 if (trans)
504 rxrpc_put_transport(trans);
505 _leave(" = %d", ret);
506 return ret;
507}
508
509/*
510 * set RxRPC socket options
511 */
512static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
513 char __user *optval, unsigned int optlen)
514{
515 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
516 unsigned min_sec_level;
517 int ret;
518
519 _enter(",%d,%d,,%d", level, optname, optlen);
520
521 lock_sock(&rx->sk);
522 ret = -EOPNOTSUPP;
523
524 if (level == SOL_RXRPC) {
525 switch (optname) {
526 case RXRPC_EXCLUSIVE_CONNECTION:
527 ret = -EINVAL;
528 if (optlen != 0)
529 goto error;
530 ret = -EISCONN;
531 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
532 goto error;
533 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
534 goto success;
535
536 case RXRPC_SECURITY_KEY:
537 ret = -EINVAL;
538 if (rx->key)
539 goto error;
540 ret = -EISCONN;
541 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
542 goto error;
543 ret = rxrpc_request_key(rx, optval, optlen);
544 goto error;
545
546 case RXRPC_SECURITY_KEYRING:
547 ret = -EINVAL;
548 if (rx->key)
549 goto error;
550 ret = -EISCONN;
551 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
552 goto error;
553 ret = rxrpc_server_keyring(rx, optval, optlen);
554 goto error;
555
556 case RXRPC_MIN_SECURITY_LEVEL:
557 ret = -EINVAL;
558 if (optlen != sizeof(unsigned))
559 goto error;
560 ret = -EISCONN;
561 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
562 goto error;
563 ret = get_user(min_sec_level,
564 (unsigned __user *) optval);
565 if (ret < 0)
566 goto error;
567 ret = -EINVAL;
568 if (min_sec_level > RXRPC_SECURITY_MAX)
569 goto error;
570 rx->min_sec_level = min_sec_level;
571 goto success;
572
573 default:
574 break;
575 }
576 }
577
578success:
579 ret = 0;
580error:
581 release_sock(&rx->sk);
582 return ret;
583}
584
585/*
586 * permit an RxRPC socket to be polled
587 */
588static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
589 poll_table *wait)
590{
591 unsigned int mask;
592 struct sock *sk = sock->sk;
593
594 sock_poll_wait(file, sk_sleep(sk), wait);
595 mask = 0;
596
597 /* the socket is readable if there are any messages waiting on the Rx
598 * queue */
599 if (!skb_queue_empty(&sk->sk_receive_queue))
600 mask |= POLLIN | POLLRDNORM;
601
602 /* the socket is writable if there is space to add new data to the
603 * socket; there is no guarantee that any particular call in progress
604 * on the socket may have space in the Tx ACK window */
605 if (rxrpc_writable(sk))
606 mask |= POLLOUT | POLLWRNORM;
607
608 return mask;
609}
610
611/*
612 * create an RxRPC socket
613 */
614static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
615 int kern)
616{
617 struct rxrpc_sock *rx;
618 struct sock *sk;
619
620 _enter("%p,%d", sock, protocol);
621
622 if (!net_eq(net, &init_net))
623 return -EAFNOSUPPORT;
624
625 /* we support transport protocol UDP only */
626 if (protocol != PF_INET)
627 return -EPROTONOSUPPORT;
628
629 if (sock->type != SOCK_DGRAM)
630 return -ESOCKTNOSUPPORT;
631
632 sock->ops = &rxrpc_rpc_ops;
633 sock->state = SS_UNCONNECTED;
634
635 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
636 if (!sk)
637 return -ENOMEM;
638
639 sock_init_data(sock, sk);
640 sk->sk_state = RXRPC_UNCONNECTED;
641 sk->sk_write_space = rxrpc_write_space;
642 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
643 sk->sk_destruct = rxrpc_sock_destructor;
644
645 rx = rxrpc_sk(sk);
646 rx->proto = protocol;
647 rx->calls = RB_ROOT;
648
649 INIT_LIST_HEAD(&rx->listen_link);
650 INIT_LIST_HEAD(&rx->secureq);
651 INIT_LIST_HEAD(&rx->acceptq);
652 rwlock_init(&rx->call_lock);
653 memset(&rx->srx, 0, sizeof(rx->srx));
654
655 _leave(" = 0 [%p]", rx);
656 return 0;
657}
658
659/*
660 * RxRPC socket destructor
661 */
662static void rxrpc_sock_destructor(struct sock *sk)
663{
664 _enter("%p", sk);
665
666 rxrpc_purge_queue(&sk->sk_receive_queue);
667
668 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
669 WARN_ON(!sk_unhashed(sk));
670 WARN_ON(sk->sk_socket);
671
672 if (!sock_flag(sk, SOCK_DEAD)) {
673 printk("Attempt to release alive rxrpc socket: %p\n", sk);
674 return;
675 }
676}
677
678/*
679 * release an RxRPC socket
680 */
681static int rxrpc_release_sock(struct sock *sk)
682{
683 struct rxrpc_sock *rx = rxrpc_sk(sk);
684
685 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
686
687 /* declare the socket closed for business */
688 sock_orphan(sk);
689 sk->sk_shutdown = SHUTDOWN_MASK;
690
691 spin_lock_bh(&sk->sk_receive_queue.lock);
692 sk->sk_state = RXRPC_CLOSE;
693 spin_unlock_bh(&sk->sk_receive_queue.lock);
694
695 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
696
697 if (!list_empty(&rx->listen_link)) {
698 write_lock_bh(&rx->local->services_lock);
699 list_del(&rx->listen_link);
700 write_unlock_bh(&rx->local->services_lock);
701 }
702
703 /* try to flush out this socket */
704 rxrpc_release_calls_on_socket(rx);
705 flush_workqueue(rxrpc_workqueue);
706 rxrpc_purge_queue(&sk->sk_receive_queue);
707
708 if (rx->conn) {
709 rxrpc_put_connection(rx->conn);
710 rx->conn = NULL;
711 }
712
713 if (rx->bundle) {
714 rxrpc_put_bundle(rx->trans, rx->bundle);
715 rx->bundle = NULL;
716 }
717 if (rx->trans) {
718 rxrpc_put_transport(rx->trans);
719 rx->trans = NULL;
720 }
721 if (rx->local) {
722 rxrpc_put_local(rx->local);
723 rx->local = NULL;
724 }
725
726 key_put(rx->key);
727 rx->key = NULL;
728 key_put(rx->securities);
729 rx->securities = NULL;
730 sock_put(sk);
731
732 _leave(" = 0");
733 return 0;
734}
735
736/*
737 * release an RxRPC BSD socket on close() or equivalent
738 */
739static int rxrpc_release(struct socket *sock)
740{
741 struct sock *sk = sock->sk;
742
743 _enter("%p{%p}", sock, sk);
744
745 if (!sk)
746 return 0;
747
748 sock->sk = NULL;
749
750 return rxrpc_release_sock(sk);
751}
752
753/*
754 * RxRPC network protocol
755 */
756static const struct proto_ops rxrpc_rpc_ops = {
757 .family = PF_UNIX,
758 .owner = THIS_MODULE,
759 .release = rxrpc_release,
760 .bind = rxrpc_bind,
761 .connect = rxrpc_connect,
762 .socketpair = sock_no_socketpair,
763 .accept = sock_no_accept,
764 .getname = sock_no_getname,
765 .poll = rxrpc_poll,
766 .ioctl = sock_no_ioctl,
767 .listen = rxrpc_listen,
768 .shutdown = sock_no_shutdown,
769 .setsockopt = rxrpc_setsockopt,
770 .getsockopt = sock_no_getsockopt,
771 .sendmsg = rxrpc_sendmsg,
772 .recvmsg = rxrpc_recvmsg,
773 .mmap = sock_no_mmap,
774 .sendpage = sock_no_sendpage,
775};
776
777static struct proto rxrpc_proto = {
778 .name = "RXRPC",
779 .owner = THIS_MODULE,
780 .obj_size = sizeof(struct rxrpc_sock),
781 .max_header = sizeof(struct rxrpc_header),
782};
783
784static const struct net_proto_family rxrpc_family_ops = {
785 .family = PF_RXRPC,
786 .create = rxrpc_create,
787 .owner = THIS_MODULE,
788};
789
790/*
791 * initialise and register the RxRPC protocol
792 */
793static int __init af_rxrpc_init(void)
794{
795 struct sk_buff *dummy_skb;
796 int ret = -1;
797
798 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
799
800 rxrpc_epoch = htonl(get_seconds());
801
802 ret = -ENOMEM;
803 rxrpc_call_jar = kmem_cache_create(
804 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
805 SLAB_HWCACHE_ALIGN, NULL);
806 if (!rxrpc_call_jar) {
807 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
808 goto error_call_jar;
809 }
810
811 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
812 if (!rxrpc_workqueue) {
813 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
814 goto error_work_queue;
815 }
816
817 ret = proto_register(&rxrpc_proto, 1);
818 if (ret < 0) {
819 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
820 goto error_proto;
821 }
822
823 ret = sock_register(&rxrpc_family_ops);
824 if (ret < 0) {
825 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
826 goto error_sock;
827 }
828
829 ret = register_key_type(&key_type_rxrpc);
830 if (ret < 0) {
831 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
832 goto error_key_type;
833 }
834
835 ret = register_key_type(&key_type_rxrpc_s);
836 if (ret < 0) {
837 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
838 goto error_key_type_s;
839 }
840
841#ifdef CONFIG_PROC_FS
842 proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
843 proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
844#endif
845 return 0;
846
847error_key_type_s:
848 unregister_key_type(&key_type_rxrpc);
849error_key_type:
850 sock_unregister(PF_RXRPC);
851error_sock:
852 proto_unregister(&rxrpc_proto);
853error_proto:
854 destroy_workqueue(rxrpc_workqueue);
855error_work_queue:
856 kmem_cache_destroy(rxrpc_call_jar);
857error_call_jar:
858 return ret;
859}
860
861/*
862 * unregister the RxRPC protocol
863 */
864static void __exit af_rxrpc_exit(void)
865{
866 _enter("");
867 unregister_key_type(&key_type_rxrpc_s);
868 unregister_key_type(&key_type_rxrpc);
869 sock_unregister(PF_RXRPC);
870 proto_unregister(&rxrpc_proto);
871 rxrpc_destroy_all_calls();
872 rxrpc_destroy_all_connections();
873 rxrpc_destroy_all_transports();
874 rxrpc_destroy_all_peers();
875 rxrpc_destroy_all_locals();
876
877 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
878
879 _debug("flush scheduled work");
880 flush_workqueue(rxrpc_workqueue);
881 proc_net_remove(&init_net, "rxrpc_conns");
882 proc_net_remove(&init_net, "rxrpc_calls");
883 destroy_workqueue(rxrpc_workqueue);
884 kmem_cache_destroy(rxrpc_call_jar);
885 _leave("");
886}
887
888module_init(af_rxrpc_init);
889module_exit(af_rxrpc_exit);
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_rcu(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_lookup_peer - Obtain remote transport endpoint for an address
263 * @sock: The socket through which it will be accessed
264 * @srx: The network address
265 * @gfp: Allocation flags
266 *
267 * Lookup or create a remote transport endpoint record for the specified
268 * address and return it with a ref held.
269 */
270struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock,
271 struct sockaddr_rxrpc *srx, gfp_t gfp)
272{
273 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
274 int ret;
275
276 ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
277 if (ret < 0)
278 return ERR_PTR(ret);
279
280 return rxrpc_lookup_peer(rx->local, srx, gfp);
281}
282EXPORT_SYMBOL(rxrpc_kernel_lookup_peer);
283
284/**
285 * rxrpc_kernel_get_peer - Get a reference on a peer
286 * @peer: The peer to get a reference on.
287 *
288 * Get a record for the remote peer in a call.
289 */
290struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer)
291{
292 return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL;
293}
294EXPORT_SYMBOL(rxrpc_kernel_get_peer);
295
296/**
297 * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference
298 * @peer: The peer to drop a ref on
299 */
300void rxrpc_kernel_put_peer(struct rxrpc_peer *peer)
301{
302 rxrpc_put_peer(peer, rxrpc_peer_put_application);
303}
304EXPORT_SYMBOL(rxrpc_kernel_put_peer);
305
306/**
307 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
308 * @sock: The socket on which to make the call
309 * @peer: The peer to contact
310 * @key: The security context to use (defaults to socket setting)
311 * @user_call_ID: The ID to use
312 * @tx_total_len: Total length of data to transmit during the call (or -1)
313 * @hard_timeout: The maximum lifespan of the call in sec
314 * @gfp: The allocation constraints
315 * @notify_rx: Where to send notifications instead of socket queue
316 * @service_id: The ID of the service to contact
317 * @upgrade: Request service upgrade for call
318 * @interruptibility: The call is interruptible, or can be canceled.
319 * @debug_id: The debug ID for tracing to be assigned to the call
320 *
321 * Allow a kernel service to begin a call on the nominated socket. This just
322 * sets up all the internal tracking structures and allocates connection and
323 * call IDs as appropriate. The call to be used is returned.
324 *
325 * The default socket destination address and security may be overridden by
326 * supplying @srx and @key.
327 */
328struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
329 struct rxrpc_peer *peer,
330 struct key *key,
331 unsigned long user_call_ID,
332 s64 tx_total_len,
333 u32 hard_timeout,
334 gfp_t gfp,
335 rxrpc_notify_rx_t notify_rx,
336 u16 service_id,
337 bool upgrade,
338 enum rxrpc_interruptibility interruptibility,
339 unsigned int debug_id)
340{
341 struct rxrpc_conn_parameters cp;
342 struct rxrpc_call_params p;
343 struct rxrpc_call *call;
344 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
345
346 _enter(",,%x,%lx", key_serial(key), user_call_ID);
347
348 if (WARN_ON_ONCE(peer->local != rx->local))
349 return ERR_PTR(-EIO);
350
351 lock_sock(&rx->sk);
352
353 if (!key)
354 key = rx->key;
355 if (key && !key->payload.data[0])
356 key = NULL; /* a no-security key */
357
358 memset(&p, 0, sizeof(p));
359 p.user_call_ID = user_call_ID;
360 p.tx_total_len = tx_total_len;
361 p.interruptibility = interruptibility;
362 p.kernel = true;
363 p.timeouts.hard = hard_timeout;
364
365 memset(&cp, 0, sizeof(cp));
366 cp.local = rx->local;
367 cp.peer = peer;
368 cp.key = key;
369 cp.security_level = rx->min_sec_level;
370 cp.exclusive = false;
371 cp.upgrade = upgrade;
372 cp.service_id = service_id;
373 call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id);
374 /* The socket has been unlocked. */
375 if (!IS_ERR(call)) {
376 call->notify_rx = notify_rx;
377 mutex_unlock(&call->user_mutex);
378 }
379
380 _leave(" = %p", call);
381 return call;
382}
383EXPORT_SYMBOL(rxrpc_kernel_begin_call);
384
385/*
386 * Dummy function used to stop the notifier talking to recvmsg().
387 */
388static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
389 unsigned long call_user_ID)
390{
391}
392
393/**
394 * rxrpc_kernel_shutdown_call - Allow a kernel service to shut down a call it was using
395 * @sock: The socket the call is on
396 * @call: The call to end
397 *
398 * Allow a kernel service to shut down a call it was using. The call must be
399 * complete before this is called (the call should be aborted if necessary).
400 */
401void rxrpc_kernel_shutdown_call(struct socket *sock, struct rxrpc_call *call)
402{
403 _enter("%d{%d}", call->debug_id, refcount_read(&call->ref));
404
405 mutex_lock(&call->user_mutex);
406 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
407 rxrpc_release_call(rxrpc_sk(sock->sk), call);
408
409 /* Make sure we're not going to call back into a kernel service */
410 if (call->notify_rx) {
411 spin_lock(&call->notify_lock);
412 call->notify_rx = rxrpc_dummy_notify_rx;
413 spin_unlock(&call->notify_lock);
414 }
415 }
416 mutex_unlock(&call->user_mutex);
417}
418EXPORT_SYMBOL(rxrpc_kernel_shutdown_call);
419
420/**
421 * rxrpc_kernel_put_call - Release a reference to a call
422 * @sock: The socket the call is on
423 * @call: The call to put
424 *
425 * Drop the application's ref on an rxrpc call.
426 */
427void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call)
428{
429 rxrpc_put_call(call, rxrpc_call_put_kernel);
430}
431EXPORT_SYMBOL(rxrpc_kernel_put_call);
432
433/**
434 * rxrpc_kernel_check_life - Check to see whether a call is still alive
435 * @sock: The socket the call is on
436 * @call: The call to check
437 *
438 * Allow a kernel service to find out whether a call is still alive - whether
439 * it has completed successfully and all received data has been consumed.
440 */
441bool rxrpc_kernel_check_life(const struct socket *sock,
442 const struct rxrpc_call *call)
443{
444 if (!rxrpc_call_is_complete(call))
445 return true;
446 if (call->completion != RXRPC_CALL_SUCCEEDED)
447 return false;
448 return !skb_queue_empty(&call->recvmsg_queue);
449}
450EXPORT_SYMBOL(rxrpc_kernel_check_life);
451
452/**
453 * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
454 * @sock: The socket the call is on
455 * @call: The call to query
456 *
457 * Allow a kernel service to retrieve the epoch value from a service call to
458 * see if the client at the other end rebooted.
459 */
460u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
461{
462 return call->conn->proto.epoch;
463}
464EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
465
466/**
467 * rxrpc_kernel_new_call_notification - Get notifications of new calls
468 * @sock: The socket to intercept received messages on
469 * @notify_new_call: Function to be called when new calls appear
470 * @discard_new_call: Function to discard preallocated calls
471 *
472 * Allow a kernel service to be given notifications about new calls.
473 */
474void rxrpc_kernel_new_call_notification(
475 struct socket *sock,
476 rxrpc_notify_new_call_t notify_new_call,
477 rxrpc_discard_new_call_t discard_new_call)
478{
479 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
480
481 rx->notify_new_call = notify_new_call;
482 rx->discard_new_call = discard_new_call;
483}
484EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
485
486/**
487 * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
488 * @sock: The socket the call is on
489 * @call: The call to configure
490 * @hard_timeout: The maximum lifespan of the call in ms
491 *
492 * Set the maximum lifespan of a call. The call will end with ETIME or
493 * ETIMEDOUT if it takes longer than this.
494 */
495void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
496 unsigned long hard_timeout)
497{
498 ktime_t delay = ms_to_ktime(hard_timeout), expect_term_by;
499
500 mutex_lock(&call->user_mutex);
501
502 expect_term_by = ktime_add(ktime_get_real(), delay);
503 WRITE_ONCE(call->expect_term_by, expect_term_by);
504 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
505 rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
506
507 mutex_unlock(&call->user_mutex);
508}
509EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
510
511/*
512 * connect an RxRPC socket
513 * - this just targets it at a specific destination; no actual connection
514 * negotiation takes place
515 */
516static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
517 int addr_len, int flags)
518{
519 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
520 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
521 int ret;
522
523 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
524
525 ret = rxrpc_validate_address(rx, srx, addr_len);
526 if (ret < 0) {
527 _leave(" = %d [bad addr]", ret);
528 return ret;
529 }
530
531 lock_sock(&rx->sk);
532
533 ret = -EISCONN;
534 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
535 goto error;
536
537 switch (rx->sk.sk_state) {
538 case RXRPC_UNBOUND:
539 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
540 break;
541 case RXRPC_CLIENT_UNBOUND:
542 case RXRPC_CLIENT_BOUND:
543 break;
544 default:
545 ret = -EBUSY;
546 goto error;
547 }
548
549 rx->connect_srx = *srx;
550 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
551 ret = 0;
552
553error:
554 release_sock(&rx->sk);
555 return ret;
556}
557
558/*
559 * send a message through an RxRPC socket
560 * - in a client this does a number of things:
561 * - finds/sets up a connection for the security specified (if any)
562 * - initiates a call (ID in control data)
563 * - ends the request phase of a call (if MSG_MORE is not set)
564 * - sends a call data packet
565 * - may send an abort (abort code in control data)
566 */
567static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
568{
569 struct rxrpc_local *local;
570 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
571 int ret;
572
573 _enter(",{%d},,%zu", rx->sk.sk_state, len);
574
575 if (m->msg_flags & MSG_OOB)
576 return -EOPNOTSUPP;
577
578 if (m->msg_name) {
579 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
580 if (ret < 0) {
581 _leave(" = %d [bad addr]", ret);
582 return ret;
583 }
584 }
585
586 lock_sock(&rx->sk);
587
588 switch (rx->sk.sk_state) {
589 case RXRPC_UNBOUND:
590 case RXRPC_CLIENT_UNBOUND:
591 rx->srx.srx_family = AF_RXRPC;
592 rx->srx.srx_service = 0;
593 rx->srx.transport_type = SOCK_DGRAM;
594 rx->srx.transport.family = rx->family;
595 switch (rx->family) {
596 case AF_INET:
597 rx->srx.transport_len = sizeof(struct sockaddr_in);
598 break;
599#ifdef CONFIG_AF_RXRPC_IPV6
600 case AF_INET6:
601 rx->srx.transport_len = sizeof(struct sockaddr_in6);
602 break;
603#endif
604 default:
605 ret = -EAFNOSUPPORT;
606 goto error_unlock;
607 }
608 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
609 if (IS_ERR(local)) {
610 ret = PTR_ERR(local);
611 goto error_unlock;
612 }
613
614 rx->local = local;
615 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
616 fallthrough;
617
618 case RXRPC_CLIENT_BOUND:
619 if (!m->msg_name &&
620 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
621 m->msg_name = &rx->connect_srx;
622 m->msg_namelen = sizeof(rx->connect_srx);
623 }
624 fallthrough;
625 case RXRPC_SERVER_BOUND:
626 case RXRPC_SERVER_LISTENING:
627 ret = rxrpc_do_sendmsg(rx, m, len);
628 /* The socket has been unlocked */
629 goto out;
630 default:
631 ret = -EINVAL;
632 goto error_unlock;
633 }
634
635error_unlock:
636 release_sock(&rx->sk);
637out:
638 _leave(" = %d", ret);
639 return ret;
640}
641
642int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
643{
644 if (sk->sk_state != RXRPC_UNBOUND)
645 return -EISCONN;
646 if (val > RXRPC_SECURITY_MAX)
647 return -EINVAL;
648 lock_sock(sk);
649 rxrpc_sk(sk)->min_sec_level = val;
650 release_sock(sk);
651 return 0;
652}
653EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
654
655/*
656 * set RxRPC socket options
657 */
658static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
659 sockptr_t optval, unsigned int optlen)
660{
661 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
662 unsigned int min_sec_level;
663 u16 service_upgrade[2];
664 int ret;
665
666 _enter(",%d,%d,,%d", level, optname, optlen);
667
668 lock_sock(&rx->sk);
669 ret = -EOPNOTSUPP;
670
671 if (level == SOL_RXRPC) {
672 switch (optname) {
673 case RXRPC_EXCLUSIVE_CONNECTION:
674 ret = -EINVAL;
675 if (optlen != 0)
676 goto error;
677 ret = -EISCONN;
678 if (rx->sk.sk_state != RXRPC_UNBOUND)
679 goto error;
680 rx->exclusive = true;
681 goto success;
682
683 case RXRPC_SECURITY_KEY:
684 ret = -EINVAL;
685 if (rx->key)
686 goto error;
687 ret = -EISCONN;
688 if (rx->sk.sk_state != RXRPC_UNBOUND)
689 goto error;
690 ret = rxrpc_request_key(rx, optval, optlen);
691 goto error;
692
693 case RXRPC_SECURITY_KEYRING:
694 ret = -EINVAL;
695 if (rx->key)
696 goto error;
697 ret = -EISCONN;
698 if (rx->sk.sk_state != RXRPC_UNBOUND)
699 goto error;
700 ret = rxrpc_server_keyring(rx, optval, optlen);
701 goto error;
702
703 case RXRPC_MIN_SECURITY_LEVEL:
704 ret = -EINVAL;
705 if (optlen != sizeof(unsigned int))
706 goto error;
707 ret = -EISCONN;
708 if (rx->sk.sk_state != RXRPC_UNBOUND)
709 goto error;
710 ret = copy_safe_from_sockptr(&min_sec_level,
711 sizeof(min_sec_level),
712 optval, optlen);
713 if (ret)
714 goto error;
715 ret = -EINVAL;
716 if (min_sec_level > RXRPC_SECURITY_MAX)
717 goto error;
718 rx->min_sec_level = min_sec_level;
719 goto success;
720
721 case RXRPC_UPGRADEABLE_SERVICE:
722 ret = -EINVAL;
723 if (optlen != sizeof(service_upgrade) ||
724 rx->service_upgrade.from != 0)
725 goto error;
726 ret = -EISCONN;
727 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
728 goto error;
729 ret = -EFAULT;
730 if (copy_from_sockptr(service_upgrade, optval,
731 sizeof(service_upgrade)) != 0)
732 goto error;
733 ret = -EINVAL;
734 if ((service_upgrade[0] != rx->srx.srx_service ||
735 service_upgrade[1] != rx->second_service) &&
736 (service_upgrade[0] != rx->second_service ||
737 service_upgrade[1] != rx->srx.srx_service))
738 goto error;
739 rx->service_upgrade.from = service_upgrade[0];
740 rx->service_upgrade.to = service_upgrade[1];
741 goto success;
742
743 default:
744 break;
745 }
746 }
747
748success:
749 ret = 0;
750error:
751 release_sock(&rx->sk);
752 return ret;
753}
754
755/*
756 * Get socket options.
757 */
758static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
759 char __user *optval, int __user *_optlen)
760{
761 int optlen;
762
763 if (level != SOL_RXRPC)
764 return -EOPNOTSUPP;
765
766 if (get_user(optlen, _optlen))
767 return -EFAULT;
768
769 switch (optname) {
770 case RXRPC_SUPPORTED_CMSG:
771 if (optlen < sizeof(int))
772 return -ETOOSMALL;
773 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
774 put_user(sizeof(int), _optlen))
775 return -EFAULT;
776 return 0;
777
778 default:
779 return -EOPNOTSUPP;
780 }
781}
782
783/*
784 * permit an RxRPC socket to be polled
785 */
786static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
787 poll_table *wait)
788{
789 struct sock *sk = sock->sk;
790 struct rxrpc_sock *rx = rxrpc_sk(sk);
791 __poll_t mask;
792
793 sock_poll_wait(file, sock, wait);
794 mask = 0;
795
796 /* the socket is readable if there are any messages waiting on the Rx
797 * queue */
798 if (!list_empty(&rx->recvmsg_q))
799 mask |= EPOLLIN | EPOLLRDNORM;
800
801 /* the socket is writable if there is space to add new data to the
802 * socket; there is no guarantee that any particular call in progress
803 * on the socket may have space in the Tx ACK window */
804 if (rxrpc_writable(sk))
805 mask |= EPOLLOUT | EPOLLWRNORM;
806
807 return mask;
808}
809
810/*
811 * create an RxRPC socket
812 */
813static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
814 int kern)
815{
816 struct rxrpc_net *rxnet;
817 struct rxrpc_sock *rx;
818 struct sock *sk;
819
820 _enter("%p,%d", sock, protocol);
821
822 /* we support transport protocol UDP/UDP6 only */
823 if (protocol != PF_INET &&
824 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
825 return -EPROTONOSUPPORT;
826
827 if (sock->type != SOCK_DGRAM)
828 return -ESOCKTNOSUPPORT;
829
830 sock->ops = &rxrpc_rpc_ops;
831 sock->state = SS_UNCONNECTED;
832
833 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
834 if (!sk)
835 return -ENOMEM;
836
837 sock_init_data(sock, sk);
838 sock_set_flag(sk, SOCK_RCU_FREE);
839 sk->sk_state = RXRPC_UNBOUND;
840 sk->sk_write_space = rxrpc_write_space;
841 sk->sk_max_ack_backlog = 0;
842 sk->sk_destruct = rxrpc_sock_destructor;
843
844 rx = rxrpc_sk(sk);
845 rx->family = protocol;
846 rx->calls = RB_ROOT;
847
848 spin_lock_init(&rx->incoming_lock);
849 INIT_LIST_HEAD(&rx->sock_calls);
850 INIT_LIST_HEAD(&rx->to_be_accepted);
851 INIT_LIST_HEAD(&rx->recvmsg_q);
852 spin_lock_init(&rx->recvmsg_lock);
853 rwlock_init(&rx->call_lock);
854 memset(&rx->srx, 0, sizeof(rx->srx));
855
856 rxnet = rxrpc_net(sock_net(&rx->sk));
857 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
858
859 _leave(" = 0 [%p]", rx);
860 return 0;
861}
862
863/*
864 * Kill all the calls on a socket and shut it down.
865 */
866static int rxrpc_shutdown(struct socket *sock, int flags)
867{
868 struct sock *sk = sock->sk;
869 struct rxrpc_sock *rx = rxrpc_sk(sk);
870 int ret = 0;
871
872 _enter("%p,%d", sk, flags);
873
874 if (flags != SHUT_RDWR)
875 return -EOPNOTSUPP;
876 if (sk->sk_state == RXRPC_CLOSE)
877 return -ESHUTDOWN;
878
879 lock_sock(sk);
880
881 if (sk->sk_state < RXRPC_CLOSE) {
882 sk->sk_state = RXRPC_CLOSE;
883 sk->sk_shutdown = SHUTDOWN_MASK;
884 } else {
885 ret = -ESHUTDOWN;
886 }
887
888 rxrpc_discard_prealloc(rx);
889
890 release_sock(sk);
891 return ret;
892}
893
894/*
895 * RxRPC socket destructor
896 */
897static void rxrpc_sock_destructor(struct sock *sk)
898{
899 _enter("%p", sk);
900
901 rxrpc_purge_queue(&sk->sk_receive_queue);
902
903 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
904 WARN_ON(!sk_unhashed(sk));
905 WARN_ON(sk->sk_socket);
906
907 if (!sock_flag(sk, SOCK_DEAD)) {
908 printk("Attempt to release alive rxrpc socket: %p\n", sk);
909 return;
910 }
911}
912
913/*
914 * release an RxRPC socket
915 */
916static int rxrpc_release_sock(struct sock *sk)
917{
918 struct rxrpc_sock *rx = rxrpc_sk(sk);
919
920 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
921
922 /* declare the socket closed for business */
923 sock_orphan(sk);
924 sk->sk_shutdown = SHUTDOWN_MASK;
925
926 /* We want to kill off all connections from a service socket
927 * as fast as possible because we can't share these; client
928 * sockets, on the other hand, can share an endpoint.
929 */
930 switch (sk->sk_state) {
931 case RXRPC_SERVER_BOUND:
932 case RXRPC_SERVER_BOUND2:
933 case RXRPC_SERVER_LISTENING:
934 case RXRPC_SERVER_LISTEN_DISABLED:
935 rx->local->service_closed = true;
936 break;
937 }
938
939 sk->sk_state = RXRPC_CLOSE;
940
941 if (rx->local && rx->local->service == rx) {
942 write_lock(&rx->local->services_lock);
943 rx->local->service = NULL;
944 write_unlock(&rx->local->services_lock);
945 }
946
947 /* try to flush out this socket */
948 rxrpc_discard_prealloc(rx);
949 rxrpc_release_calls_on_socket(rx);
950 flush_workqueue(rxrpc_workqueue);
951 rxrpc_purge_queue(&sk->sk_receive_queue);
952
953 rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock);
954 rxrpc_put_local(rx->local, rxrpc_local_put_release_sock);
955 rx->local = NULL;
956 key_put(rx->key);
957 rx->key = NULL;
958 key_put(rx->securities);
959 rx->securities = NULL;
960 sock_put(sk);
961
962 _leave(" = 0");
963 return 0;
964}
965
966/*
967 * release an RxRPC BSD socket on close() or equivalent
968 */
969static int rxrpc_release(struct socket *sock)
970{
971 struct sock *sk = sock->sk;
972
973 _enter("%p{%p}", sock, sk);
974
975 if (!sk)
976 return 0;
977
978 sock->sk = NULL;
979
980 return rxrpc_release_sock(sk);
981}
982
983/*
984 * RxRPC network protocol
985 */
986static const struct proto_ops rxrpc_rpc_ops = {
987 .family = PF_RXRPC,
988 .owner = THIS_MODULE,
989 .release = rxrpc_release,
990 .bind = rxrpc_bind,
991 .connect = rxrpc_connect,
992 .socketpair = sock_no_socketpair,
993 .accept = sock_no_accept,
994 .getname = sock_no_getname,
995 .poll = rxrpc_poll,
996 .ioctl = sock_no_ioctl,
997 .listen = rxrpc_listen,
998 .shutdown = rxrpc_shutdown,
999 .setsockopt = rxrpc_setsockopt,
1000 .getsockopt = rxrpc_getsockopt,
1001 .sendmsg = rxrpc_sendmsg,
1002 .recvmsg = rxrpc_recvmsg,
1003 .mmap = sock_no_mmap,
1004};
1005
1006static struct proto rxrpc_proto = {
1007 .name = "RXRPC",
1008 .owner = THIS_MODULE,
1009 .obj_size = sizeof(struct rxrpc_sock),
1010 .max_header = sizeof(struct rxrpc_wire_header),
1011};
1012
1013static const struct net_proto_family rxrpc_family_ops = {
1014 .family = PF_RXRPC,
1015 .create = rxrpc_create,
1016 .owner = THIS_MODULE,
1017};
1018
1019/*
1020 * initialise and register the RxRPC protocol
1021 */
1022static int __init af_rxrpc_init(void)
1023{
1024 int ret = -1;
1025
1026 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
1027
1028 ret = -ENOMEM;
1029 rxrpc_gen_version_string();
1030 rxrpc_call_jar = kmem_cache_create(
1031 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
1032 SLAB_HWCACHE_ALIGN, NULL);
1033 if (!rxrpc_call_jar) {
1034 pr_notice("Failed to allocate call jar\n");
1035 goto error_call_jar;
1036 }
1037
1038 rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM);
1039 if (!rxrpc_workqueue) {
1040 pr_notice("Failed to allocate work queue\n");
1041 goto error_work_queue;
1042 }
1043
1044 ret = rxrpc_init_security();
1045 if (ret < 0) {
1046 pr_crit("Cannot initialise security\n");
1047 goto error_security;
1048 }
1049
1050 ret = register_pernet_device(&rxrpc_net_ops);
1051 if (ret)
1052 goto error_pernet;
1053
1054 ret = proto_register(&rxrpc_proto, 1);
1055 if (ret < 0) {
1056 pr_crit("Cannot register protocol\n");
1057 goto error_proto;
1058 }
1059
1060 ret = sock_register(&rxrpc_family_ops);
1061 if (ret < 0) {
1062 pr_crit("Cannot register socket family\n");
1063 goto error_sock;
1064 }
1065
1066 ret = register_key_type(&key_type_rxrpc);
1067 if (ret < 0) {
1068 pr_crit("Cannot register client key type\n");
1069 goto error_key_type;
1070 }
1071
1072 ret = register_key_type(&key_type_rxrpc_s);
1073 if (ret < 0) {
1074 pr_crit("Cannot register server key type\n");
1075 goto error_key_type_s;
1076 }
1077
1078 ret = rxrpc_sysctl_init();
1079 if (ret < 0) {
1080 pr_crit("Cannot register sysctls\n");
1081 goto error_sysctls;
1082 }
1083
1084 return 0;
1085
1086error_sysctls:
1087 unregister_key_type(&key_type_rxrpc_s);
1088error_key_type_s:
1089 unregister_key_type(&key_type_rxrpc);
1090error_key_type:
1091 sock_unregister(PF_RXRPC);
1092error_sock:
1093 proto_unregister(&rxrpc_proto);
1094error_proto:
1095 unregister_pernet_device(&rxrpc_net_ops);
1096error_pernet:
1097 rxrpc_exit_security();
1098error_security:
1099 destroy_workqueue(rxrpc_workqueue);
1100error_work_queue:
1101 kmem_cache_destroy(rxrpc_call_jar);
1102error_call_jar:
1103 return ret;
1104}
1105
1106/*
1107 * unregister the RxRPC protocol
1108 */
1109static void __exit af_rxrpc_exit(void)
1110{
1111 _enter("");
1112 rxrpc_sysctl_exit();
1113 unregister_key_type(&key_type_rxrpc_s);
1114 unregister_key_type(&key_type_rxrpc);
1115 sock_unregister(PF_RXRPC);
1116 proto_unregister(&rxrpc_proto);
1117 unregister_pernet_device(&rxrpc_net_ops);
1118 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1119
1120 /* Make sure the local and peer records pinned by any dying connections
1121 * are released.
1122 */
1123 rcu_barrier();
1124
1125 destroy_workqueue(rxrpc_workqueue);
1126 rxrpc_exit_security();
1127 kmem_cache_destroy(rxrpc_call_jar);
1128 _leave("");
1129}
1130
1131module_init(af_rxrpc_init);
1132module_exit(af_rxrpc_exit);