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(r: &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, how: 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_unsized *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(sk: &rx->sk);
146
147 switch (rx->sk.sk_state) {
148 case RXRPC_UNBOUND:
149 rx->srx = *srx;
150 local = rxrpc_lookup_local(sock_net(sk: &rx->sk), &rx->srx);
151 if (IS_ERR(ptr: local)) {
152 ret = PTR_ERR(ptr: 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(p: srx, q: &rx->srx, size: 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(sk: &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(sk: &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(sk: &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(sk: &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.
269 *
270 * Return: The peer record found with a reference, %NULL if no record is found
271 * or a negative error code if the address is invalid or unsupported.
272 */
273struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock,
274 struct sockaddr_rxrpc *srx, gfp_t gfp)
275{
276 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
277 int ret;
278
279 ret = rxrpc_validate_address(rx, srx, len: sizeof(*srx));
280 if (ret < 0)
281 return ERR_PTR(error: ret);
282
283 return rxrpc_lookup_peer(local: rx->local, srx, gfp);
284}
285EXPORT_SYMBOL(rxrpc_kernel_lookup_peer);
286
287/**
288 * rxrpc_kernel_get_peer - Get a reference on a peer
289 * @peer: The peer to get a reference on (may be NULL).
290 *
291 * Get a reference for a remote peer record (if not NULL).
292 *
293 * Return: The @peer argument.
294 */
295struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer)
296{
297 return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL;
298}
299EXPORT_SYMBOL(rxrpc_kernel_get_peer);
300
301/**
302 * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference
303 * @peer: The peer to drop a ref on
304 *
305 * Drop a reference on a peer record.
306 */
307void rxrpc_kernel_put_peer(struct rxrpc_peer *peer)
308{
309 rxrpc_put_peer(peer, rxrpc_peer_put_application);
310}
311EXPORT_SYMBOL(rxrpc_kernel_put_peer);
312
313/**
314 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
315 * @sock: The socket on which to make the call
316 * @peer: The peer to contact
317 * @key: The security context to use (defaults to socket setting)
318 * @user_call_ID: The ID to use
319 * @tx_total_len: Total length of data to transmit during the call (or -1)
320 * @hard_timeout: The maximum lifespan of the call in sec
321 * @gfp: The allocation constraints
322 * @notify_rx: Where to send notifications instead of socket queue
323 * @service_id: The ID of the service to contact
324 * @upgrade: Request service upgrade for call
325 * @interruptibility: The call is interruptible, or can be canceled.
326 * @debug_id: The debug ID for tracing to be assigned to the call
327 *
328 * Allow a kernel service to begin a call on the nominated socket. This just
329 * sets up all the internal tracking structures and allocates connection and
330 * call IDs as appropriate.
331 *
332 * The default socket destination address and security may be overridden by
333 * supplying @srx and @key.
334 *
335 * Return: The new call or an error code.
336 */
337struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
338 struct rxrpc_peer *peer,
339 struct key *key,
340 unsigned long user_call_ID,
341 s64 tx_total_len,
342 u32 hard_timeout,
343 gfp_t gfp,
344 rxrpc_notify_rx_t notify_rx,
345 u16 service_id,
346 bool upgrade,
347 enum rxrpc_interruptibility interruptibility,
348 unsigned int debug_id)
349{
350 struct rxrpc_conn_parameters cp;
351 struct rxrpc_call_params p;
352 struct rxrpc_call *call;
353 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
354
355 _enter(",,%x,%lx", key_serial(key), user_call_ID);
356
357 if (WARN_ON_ONCE(peer->local != rx->local))
358 return ERR_PTR(error: -EIO);
359
360 lock_sock(sk: &rx->sk);
361
362 if (!key)
363 key = rx->key;
364 if (key && !key->payload.data[0])
365 key = NULL; /* a no-security key */
366
367 memset(&p, 0, sizeof(p));
368 p.user_call_ID = user_call_ID;
369 p.tx_total_len = tx_total_len;
370 p.interruptibility = interruptibility;
371 p.kernel = true;
372 p.timeouts.hard = hard_timeout;
373
374 memset(&cp, 0, sizeof(cp));
375 cp.local = rx->local;
376 cp.peer = peer;
377 cp.key = key;
378 cp.security_level = rx->min_sec_level;
379 cp.exclusive = false;
380 cp.upgrade = upgrade;
381 cp.service_id = service_id;
382 call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id);
383 /* The socket has been unlocked. */
384 if (!IS_ERR(ptr: call)) {
385 call->notify_rx = notify_rx;
386 mutex_unlock(lock: &call->user_mutex);
387 }
388
389 _leave(" = %p", call);
390 return call;
391}
392EXPORT_SYMBOL(rxrpc_kernel_begin_call);
393
394/*
395 * Dummy function used to stop the notifier talking to recvmsg().
396 */
397static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
398 unsigned long call_user_ID)
399{
400}
401
402/**
403 * rxrpc_kernel_shutdown_call - Allow a kernel service to shut down a call it was using
404 * @sock: The socket the call is on
405 * @call: The call to end
406 *
407 * Allow a kernel service to shut down a call it was using. The call must be
408 * complete before this is called (the call should be aborted if necessary).
409 */
410void rxrpc_kernel_shutdown_call(struct socket *sock, struct rxrpc_call *call)
411{
412 _enter("%d{%d}", call->debug_id, refcount_read(&call->ref));
413
414 mutex_lock(&call->user_mutex);
415 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
416 rxrpc_release_call(rxrpc_sk(sock->sk), call);
417
418 /* Make sure we're not going to call back into a kernel service */
419 if (call->notify_rx) {
420 spin_lock_irq(lock: &call->notify_lock);
421 call->notify_rx = rxrpc_dummy_notify_rx;
422 spin_unlock_irq(lock: &call->notify_lock);
423 }
424 }
425 mutex_unlock(lock: &call->user_mutex);
426}
427EXPORT_SYMBOL(rxrpc_kernel_shutdown_call);
428
429/**
430 * rxrpc_kernel_put_call - Release a reference to a call
431 * @sock: The socket the call is on
432 * @call: The call to put
433 *
434 * Drop the application's ref on an rxrpc call.
435 */
436void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call)
437{
438 rxrpc_put_call(call, rxrpc_call_put_kernel);
439}
440EXPORT_SYMBOL(rxrpc_kernel_put_call);
441
442/**
443 * rxrpc_kernel_check_life - Check to see whether a call is still alive
444 * @sock: The socket the call is on
445 * @call: The call to check
446 *
447 * Allow a kernel service to find out whether a call is still alive - whether
448 * it has completed successfully and all received data has been consumed.
449 *
450 * Return: %true if the call is still ongoing and %false if it has completed.
451 */
452bool rxrpc_kernel_check_life(const struct socket *sock,
453 const struct rxrpc_call *call)
454{
455 if (!rxrpc_call_is_complete(call))
456 return true;
457 if (call->completion != RXRPC_CALL_SUCCEEDED)
458 return false;
459 return !skb_queue_empty(list: &call->recvmsg_queue);
460}
461EXPORT_SYMBOL(rxrpc_kernel_check_life);
462
463/**
464 * rxrpc_kernel_set_notifications - Set table of callback operations
465 * @sock: The socket to install table upon
466 * @app_ops: Callback operation table to set
467 *
468 * Allow a kernel service to set a table of event notifications on a socket.
469 */
470void rxrpc_kernel_set_notifications(struct socket *sock,
471 const struct rxrpc_kernel_ops *app_ops)
472{
473 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
474
475 rx->app_ops = app_ops;
476}
477EXPORT_SYMBOL(rxrpc_kernel_set_notifications);
478
479/*
480 * connect an RxRPC socket
481 * - this just targets it at a specific destination; no actual connection
482 * negotiation takes place
483 */
484static int rxrpc_connect(struct socket *sock, struct sockaddr_unsized *addr,
485 int addr_len, int flags)
486{
487 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
488 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
489 int ret;
490
491 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
492
493 ret = rxrpc_validate_address(rx, srx, len: addr_len);
494 if (ret < 0) {
495 _leave(" = %d [bad addr]", ret);
496 return ret;
497 }
498
499 lock_sock(sk: &rx->sk);
500
501 ret = -EISCONN;
502 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
503 goto error;
504
505 switch (rx->sk.sk_state) {
506 case RXRPC_UNBOUND:
507 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
508 break;
509 case RXRPC_CLIENT_UNBOUND:
510 case RXRPC_CLIENT_BOUND:
511 break;
512 default:
513 ret = -EBUSY;
514 goto error;
515 }
516
517 rx->connect_srx = *srx;
518 set_bit(RXRPC_SOCK_CONNECTED, addr: &rx->flags);
519 ret = 0;
520
521error:
522 release_sock(sk: &rx->sk);
523 return ret;
524}
525
526/*
527 * send a message through an RxRPC socket
528 * - in a client this does a number of things:
529 * - finds/sets up a connection for the security specified (if any)
530 * - initiates a call (ID in control data)
531 * - ends the request phase of a call (if MSG_MORE is not set)
532 * - sends a call data packet
533 * - may send an abort (abort code in control data)
534 */
535static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
536{
537 struct rxrpc_local *local;
538 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
539 int ret;
540
541 _enter(",{%d},,%zu", rx->sk.sk_state, len);
542
543 if (m->msg_flags & MSG_OOB)
544 return -EOPNOTSUPP;
545
546 if (m->msg_name) {
547 ret = rxrpc_validate_address(rx, srx: m->msg_name, len: m->msg_namelen);
548 if (ret < 0) {
549 _leave(" = %d [bad addr]", ret);
550 return ret;
551 }
552 }
553
554 lock_sock(sk: &rx->sk);
555
556 switch (rx->sk.sk_state) {
557 case RXRPC_UNBOUND:
558 case RXRPC_CLIENT_UNBOUND:
559 rx->srx.srx_family = AF_RXRPC;
560 rx->srx.srx_service = 0;
561 rx->srx.transport_type = SOCK_DGRAM;
562 rx->srx.transport.family = rx->family;
563 switch (rx->family) {
564 case AF_INET:
565 rx->srx.transport_len = sizeof(struct sockaddr_in);
566 break;
567#ifdef CONFIG_AF_RXRPC_IPV6
568 case AF_INET6:
569 rx->srx.transport_len = sizeof(struct sockaddr_in6);
570 break;
571#endif
572 default:
573 ret = -EAFNOSUPPORT;
574 goto error_unlock;
575 }
576 local = rxrpc_lookup_local(sock_net(sk: sock->sk), &rx->srx);
577 if (IS_ERR(ptr: local)) {
578 ret = PTR_ERR(ptr: local);
579 goto error_unlock;
580 }
581
582 rx->local = local;
583 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
584 fallthrough;
585
586 case RXRPC_CLIENT_BOUND:
587 if (!m->msg_name &&
588 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
589 m->msg_name = &rx->connect_srx;
590 m->msg_namelen = sizeof(rx->connect_srx);
591 }
592 fallthrough;
593 case RXRPC_SERVER_BOUND:
594 case RXRPC_SERVER_LISTENING:
595 if (m->msg_flags & MSG_OOB)
596 ret = rxrpc_sendmsg_oob(rx, msg: m, len);
597 else
598 ret = rxrpc_do_sendmsg(rx, m, len);
599 /* The socket has been unlocked */
600 goto out;
601 default:
602 ret = -EINVAL;
603 goto error_unlock;
604 }
605
606error_unlock:
607 release_sock(sk: &rx->sk);
608out:
609 _leave(" = %d", ret);
610 return ret;
611}
612
613int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
614{
615 if (sk->sk_state != RXRPC_UNBOUND)
616 return -EISCONN;
617 if (val > RXRPC_SECURITY_MAX)
618 return -EINVAL;
619 lock_sock(sk);
620 rxrpc_sk(sk)->min_sec_level = val;
621 release_sock(sk);
622 return 0;
623}
624EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
625
626/*
627 * set RxRPC socket options
628 */
629static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
630 sockptr_t optval, unsigned int optlen)
631{
632 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
633 unsigned int min_sec_level, val;
634 u16 service_upgrade[2];
635 int ret;
636
637 _enter(",%d,%d,,%d", level, optname, optlen);
638
639 lock_sock(sk: &rx->sk);
640 ret = -EOPNOTSUPP;
641
642 if (level == SOL_RXRPC) {
643 switch (optname) {
644 case RXRPC_EXCLUSIVE_CONNECTION:
645 ret = -EINVAL;
646 if (optlen != 0)
647 goto error;
648 ret = -EISCONN;
649 if (rx->sk.sk_state != RXRPC_UNBOUND)
650 goto error;
651 rx->exclusive = true;
652 goto success;
653
654 case RXRPC_SECURITY_KEY:
655 ret = -EINVAL;
656 if (rx->key)
657 goto error;
658 ret = -EISCONN;
659 if (rx->sk.sk_state != RXRPC_UNBOUND)
660 goto error;
661 ret = rxrpc_request_key(rx, optval, optlen);
662 goto error;
663
664 case RXRPC_SECURITY_KEYRING:
665 ret = -EINVAL;
666 if (rx->key)
667 goto error;
668 ret = -EISCONN;
669 if (rx->sk.sk_state != RXRPC_UNBOUND)
670 goto error;
671 ret = rxrpc_server_keyring(rx, optval, optlen);
672 goto error;
673
674 case RXRPC_MIN_SECURITY_LEVEL:
675 ret = -EINVAL;
676 if (optlen != sizeof(unsigned int))
677 goto error;
678 ret = -EISCONN;
679 if (rx->sk.sk_state != RXRPC_UNBOUND)
680 goto error;
681 ret = copy_safe_from_sockptr(dst: &min_sec_level,
682 ksize: sizeof(min_sec_level),
683 optval, optlen);
684 if (ret)
685 goto error;
686 ret = -EINVAL;
687 if (min_sec_level > RXRPC_SECURITY_MAX)
688 goto error;
689 rx->min_sec_level = min_sec_level;
690 goto success;
691
692 case RXRPC_UPGRADEABLE_SERVICE:
693 ret = -EINVAL;
694 if (optlen != sizeof(service_upgrade) ||
695 rx->service_upgrade.from != 0)
696 goto error;
697 ret = -EISCONN;
698 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
699 goto error;
700 ret = -EFAULT;
701 if (copy_from_sockptr(dst: service_upgrade, src: optval,
702 size: sizeof(service_upgrade)) != 0)
703 goto error;
704 ret = -EINVAL;
705 if ((service_upgrade[0] != rx->srx.srx_service ||
706 service_upgrade[1] != rx->second_service) &&
707 (service_upgrade[0] != rx->second_service ||
708 service_upgrade[1] != rx->srx.srx_service))
709 goto error;
710 rx->service_upgrade.from = service_upgrade[0];
711 rx->service_upgrade.to = service_upgrade[1];
712 goto success;
713
714 case RXRPC_MANAGE_RESPONSE:
715 ret = -EINVAL;
716 if (optlen != sizeof(unsigned int))
717 goto error;
718 ret = -EISCONN;
719 if (rx->sk.sk_state != RXRPC_UNBOUND)
720 goto error;
721 ret = copy_safe_from_sockptr(dst: &val, ksize: sizeof(val),
722 optval, optlen);
723 if (ret)
724 goto error;
725 ret = -EINVAL;
726 if (val > 1)
727 goto error;
728 if (val)
729 set_bit(RXRPC_SOCK_MANAGE_RESPONSE, addr: &rx->flags);
730 else
731 clear_bit(RXRPC_SOCK_MANAGE_RESPONSE, addr: &rx->flags);
732 goto success;
733
734 default:
735 break;
736 }
737 }
738
739success:
740 ret = 0;
741error:
742 release_sock(sk: &rx->sk);
743 return ret;
744}
745
746/*
747 * Get socket options.
748 */
749static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
750 char __user *optval, int __user *_optlen)
751{
752 int optlen;
753
754 if (level != SOL_RXRPC)
755 return -EOPNOTSUPP;
756
757 if (get_user(optlen, _optlen))
758 return -EFAULT;
759
760 switch (optname) {
761 case RXRPC_SUPPORTED_CMSG:
762 if (optlen < sizeof(int))
763 return -ETOOSMALL;
764 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
765 put_user(sizeof(int), _optlen))
766 return -EFAULT;
767 return 0;
768
769 default:
770 return -EOPNOTSUPP;
771 }
772}
773
774/*
775 * permit an RxRPC socket to be polled
776 */
777static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
778 poll_table *wait)
779{
780 struct sock *sk = sock->sk;
781 struct rxrpc_sock *rx = rxrpc_sk(sk);
782 __poll_t mask;
783
784 sock_poll_wait(filp: file, sock, p: wait);
785 mask = 0;
786
787 /* the socket is readable if there are any messages waiting on the Rx
788 * queue */
789 if (!list_empty(head: &rx->recvmsg_q))
790 mask |= EPOLLIN | EPOLLRDNORM;
791
792 /* the socket is writable if there is space to add new data to the
793 * socket; there is no guarantee that any particular call in progress
794 * on the socket may have space in the Tx ACK window */
795 if (rxrpc_writable(sk))
796 mask |= EPOLLOUT | EPOLLWRNORM;
797
798 return mask;
799}
800
801/*
802 * create an RxRPC socket
803 */
804static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
805 int kern)
806{
807 struct rxrpc_net *rxnet;
808 struct rxrpc_sock *rx;
809 struct sock *sk;
810
811 _enter("%p,%d", sock, protocol);
812
813 /* we support transport protocol UDP/UDP6 only */
814 if (protocol != PF_INET &&
815 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
816 return -EPROTONOSUPPORT;
817
818 if (sock->type != SOCK_DGRAM)
819 return -ESOCKTNOSUPPORT;
820
821 sock->ops = &rxrpc_rpc_ops;
822 sock->state = SS_UNCONNECTED;
823
824 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, prot: &rxrpc_proto, kern);
825 if (!sk)
826 return -ENOMEM;
827
828 sock_init_data(sock, sk);
829 sock_set_flag(sk, flag: SOCK_RCU_FREE);
830 sk->sk_state = RXRPC_UNBOUND;
831 sk->sk_write_space = rxrpc_write_space;
832 sk->sk_max_ack_backlog = 0;
833 sk->sk_destruct = rxrpc_sock_destructor;
834
835 rx = rxrpc_sk(sk);
836 rx->family = protocol;
837 rx->calls = RB_ROOT;
838
839 spin_lock_init(&rx->incoming_lock);
840 skb_queue_head_init(list: &rx->recvmsg_oobq);
841 rx->pending_oobq = RB_ROOT;
842 INIT_LIST_HEAD(list: &rx->sock_calls);
843 INIT_LIST_HEAD(list: &rx->to_be_accepted);
844 INIT_LIST_HEAD(list: &rx->recvmsg_q);
845 spin_lock_init(&rx->recvmsg_lock);
846 rwlock_init(&rx->call_lock);
847 memset(&rx->srx, 0, sizeof(rx->srx));
848
849 rxnet = rxrpc_net(net: sock_net(sk: &rx->sk));
850 timer_reduce(timer: &rxnet->peer_keepalive_timer, expires: jiffies + 1);
851
852 _leave(" = 0 [%p]", rx);
853 return 0;
854}
855
856/*
857 * Kill all the calls on a socket and shut it down.
858 */
859static int rxrpc_shutdown(struct socket *sock, int flags)
860{
861 struct sock *sk = sock->sk;
862 struct rxrpc_sock *rx = rxrpc_sk(sk);
863 int ret = 0;
864
865 _enter("%p,%d", sk, flags);
866
867 if (flags != SHUT_RDWR)
868 return -EOPNOTSUPP;
869 if (sk->sk_state == RXRPC_CLOSE)
870 return -ESHUTDOWN;
871
872 lock_sock(sk);
873
874 if (sk->sk_state < RXRPC_CLOSE) {
875 spin_lock_irq(lock: &rx->recvmsg_lock);
876 sk->sk_state = RXRPC_CLOSE;
877 sk->sk_shutdown = SHUTDOWN_MASK;
878 spin_unlock_irq(lock: &rx->recvmsg_lock);
879 } else {
880 ret = -ESHUTDOWN;
881 }
882
883 rxrpc_discard_prealloc(rx);
884
885 release_sock(sk);
886 return ret;
887}
888
889/*
890 * Purge the out-of-band queue.
891 */
892static void rxrpc_purge_oob_queue(struct sock *sk)
893{
894 struct rxrpc_sock *rx = rxrpc_sk(sk);
895 struct sk_buff *skb;
896
897 while ((skb = skb_dequeue(list: &rx->recvmsg_oobq)))
898 rxrpc_kernel_free_oob(oob: skb);
899 while (!RB_EMPTY_ROOT(&rx->pending_oobq)) {
900 skb = rb_entry(rx->pending_oobq.rb_node, struct sk_buff, rbnode);
901 rb_erase(&skb->rbnode, &rx->pending_oobq);
902 rxrpc_kernel_free_oob(oob: skb);
903 }
904}
905
906/*
907 * RxRPC socket destructor
908 */
909static void rxrpc_sock_destructor(struct sock *sk)
910{
911 _enter("%p", sk);
912
913 rxrpc_purge_oob_queue(sk);
914 rxrpc_purge_queue(&sk->sk_receive_queue);
915
916 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
917 WARN_ON(!sk_unhashed(sk));
918 WARN_ON(sk->sk_socket);
919
920 if (!sock_flag(sk, flag: SOCK_DEAD)) {
921 printk("Attempt to release alive rxrpc socket: %p\n", sk);
922 return;
923 }
924}
925
926/*
927 * release an RxRPC socket
928 */
929static int rxrpc_release_sock(struct sock *sk)
930{
931 struct rxrpc_sock *rx = rxrpc_sk(sk);
932
933 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
934
935 /* declare the socket closed for business */
936 sock_orphan(sk);
937 sk->sk_shutdown = SHUTDOWN_MASK;
938
939 /* We want to kill off all connections from a service socket
940 * as fast as possible because we can't share these; client
941 * sockets, on the other hand, can share an endpoint.
942 */
943 switch (sk->sk_state) {
944 case RXRPC_SERVER_BOUND:
945 case RXRPC_SERVER_BOUND2:
946 case RXRPC_SERVER_LISTENING:
947 case RXRPC_SERVER_LISTEN_DISABLED:
948 rx->local->service_closed = true;
949 break;
950 }
951
952 spin_lock_irq(lock: &rx->recvmsg_lock);
953 sk->sk_state = RXRPC_CLOSE;
954 spin_unlock_irq(lock: &rx->recvmsg_lock);
955
956 if (rx->local && rx->local->service == rx) {
957 write_lock(&rx->local->services_lock);
958 rx->local->service = NULL;
959 write_unlock(&rx->local->services_lock);
960 }
961
962 /* try to flush out this socket */
963 rxrpc_discard_prealloc(rx);
964 rxrpc_release_calls_on_socket(rx);
965 flush_workqueue(rxrpc_workqueue);
966 rxrpc_purge_oob_queue(sk);
967 rxrpc_purge_queue(&sk->sk_receive_queue);
968
969 rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock);
970 rxrpc_put_local(rx->local, rxrpc_local_put_release_sock);
971 rx->local = NULL;
972 key_put(key: rx->key);
973 rx->key = NULL;
974 key_put(key: rx->securities);
975 rx->securities = NULL;
976 sock_put(sk);
977
978 _leave(" = 0");
979 return 0;
980}
981
982/*
983 * release an RxRPC BSD socket on close() or equivalent
984 */
985static int rxrpc_release(struct socket *sock)
986{
987 struct sock *sk = sock->sk;
988
989 _enter("%p{%p}", sock, sk);
990
991 if (!sk)
992 return 0;
993
994 sock->sk = NULL;
995
996 return rxrpc_release_sock(sk);
997}
998
999/*
1000 * RxRPC network protocol
1001 */
1002static const struct proto_ops rxrpc_rpc_ops = {
1003 .family = PF_RXRPC,
1004 .owner = THIS_MODULE,
1005 .release = rxrpc_release,
1006 .bind = rxrpc_bind,
1007 .connect = rxrpc_connect,
1008 .socketpair = sock_no_socketpair,
1009 .accept = sock_no_accept,
1010 .getname = sock_no_getname,
1011 .poll = rxrpc_poll,
1012 .ioctl = sock_no_ioctl,
1013 .listen = rxrpc_listen,
1014 .shutdown = rxrpc_shutdown,
1015 .setsockopt = rxrpc_setsockopt,
1016 .getsockopt = rxrpc_getsockopt,
1017 .sendmsg = rxrpc_sendmsg,
1018 .recvmsg = rxrpc_recvmsg,
1019 .mmap = sock_no_mmap,
1020};
1021
1022static struct proto rxrpc_proto = {
1023 .name = "RXRPC",
1024 .owner = THIS_MODULE,
1025 .obj_size = sizeof(struct rxrpc_sock),
1026 .max_header = sizeof(struct rxrpc_wire_header),
1027};
1028
1029static const struct net_proto_family rxrpc_family_ops = {
1030 .family = PF_RXRPC,
1031 .create = rxrpc_create,
1032 .owner = THIS_MODULE,
1033};
1034
1035/*
1036 * initialise and register the RxRPC protocol
1037 */
1038static int __init af_rxrpc_init(void)
1039{
1040 int ret = -1;
1041
1042 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
1043
1044 ret = -ENOMEM;
1045 rxrpc_gen_version_string();
1046 rxrpc_call_jar = kmem_cache_create(
1047 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
1048 SLAB_HWCACHE_ALIGN, NULL);
1049 if (!rxrpc_call_jar) {
1050 pr_notice("Failed to allocate call jar\n");
1051 goto error_call_jar;
1052 }
1053
1054 rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM);
1055 if (!rxrpc_workqueue) {
1056 pr_notice("Failed to allocate work queue\n");
1057 goto error_work_queue;
1058 }
1059
1060 ret = rxrpc_init_security();
1061 if (ret < 0) {
1062 pr_crit("Cannot initialise security\n");
1063 goto error_security;
1064 }
1065
1066 ret = register_pernet_device(&rxrpc_net_ops);
1067 if (ret)
1068 goto error_pernet;
1069
1070 ret = proto_register(prot: &rxrpc_proto, alloc_slab: 1);
1071 if (ret < 0) {
1072 pr_crit("Cannot register protocol\n");
1073 goto error_proto;
1074 }
1075
1076 ret = sock_register(fam: &rxrpc_family_ops);
1077 if (ret < 0) {
1078 pr_crit("Cannot register socket family\n");
1079 goto error_sock;
1080 }
1081
1082 ret = register_key_type(ktype: &key_type_rxrpc);
1083 if (ret < 0) {
1084 pr_crit("Cannot register client key type\n");
1085 goto error_key_type;
1086 }
1087
1088 ret = register_key_type(ktype: &key_type_rxrpc_s);
1089 if (ret < 0) {
1090 pr_crit("Cannot register server key type\n");
1091 goto error_key_type_s;
1092 }
1093
1094 ret = rxrpc_sysctl_init();
1095 if (ret < 0) {
1096 pr_crit("Cannot register sysctls\n");
1097 goto error_sysctls;
1098 }
1099
1100 return 0;
1101
1102error_sysctls:
1103 unregister_key_type(ktype: &key_type_rxrpc_s);
1104error_key_type_s:
1105 unregister_key_type(ktype: &key_type_rxrpc);
1106error_key_type:
1107 sock_unregister(PF_RXRPC);
1108error_sock:
1109 proto_unregister(prot: &rxrpc_proto);
1110error_proto:
1111 unregister_pernet_device(&rxrpc_net_ops);
1112error_pernet:
1113 rxrpc_exit_security();
1114error_security:
1115 destroy_workqueue(wq: rxrpc_workqueue);
1116error_work_queue:
1117 kmem_cache_destroy(s: rxrpc_call_jar);
1118error_call_jar:
1119 return ret;
1120}
1121
1122/*
1123 * unregister the RxRPC protocol
1124 */
1125static void __exit af_rxrpc_exit(void)
1126{
1127 _enter("");
1128 rxrpc_sysctl_exit();
1129 unregister_key_type(ktype: &key_type_rxrpc_s);
1130 unregister_key_type(ktype: &key_type_rxrpc);
1131 sock_unregister(PF_RXRPC);
1132 proto_unregister(prot: &rxrpc_proto);
1133 unregister_pernet_device(&rxrpc_net_ops);
1134 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1135
1136 /* Make sure the local and peer records pinned by any dying connections
1137 * are released.
1138 */
1139 rcu_barrier();
1140
1141 destroy_workqueue(wq: rxrpc_workqueue);
1142 rxrpc_exit_security();
1143 kmem_cache_destroy(s: rxrpc_call_jar);
1144 _leave("");
1145}
1146
1147module_init(af_rxrpc_init);
1148module_exit(af_rxrpc_exit);
1149

source code of linux/net/rxrpc/af_rxrpc.c