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(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 *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 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, len: sizeof(*srx));
277 if (ret < 0)
278 return ERR_PTR(error: ret);
279
280 return rxrpc_lookup_peer(local: 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(error: -EIO);
350
351 lock_sock(sk: &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(ptr: call)) {
376 call->notify_rx = notify_rx;
377 mutex_unlock(lock: &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(lock: &call->notify_lock);
412 call->notify_rx = rxrpc_dummy_notify_rx;
413 spin_unlock(lock: &call->notify_lock);
414 }
415 }
416 mutex_unlock(lock: &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(list: &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(ms: 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, why: rxrpc_timer_trace_hard);
505 rxrpc_poke_call(call, what: rxrpc_call_poke_set_timeout);
506
507 mutex_unlock(lock: &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, len: addr_len);
526 if (ret < 0) {
527 _leave(" = %d [bad addr]", ret);
528 return ret;
529 }
530
531 lock_sock(sk: &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, addr: &rx->flags);
551 ret = 0;
552
553error:
554 release_sock(sk: &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, srx: m->msg_name, len: m->msg_namelen);
580 if (ret < 0) {
581 _leave(" = %d [bad addr]", ret);
582 return ret;
583 }
584 }
585
586 lock_sock(sk: &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(sk: sock->sk), &rx->srx);
609 if (IS_ERR(ptr: local)) {
610 ret = PTR_ERR(ptr: 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(sk: &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(sk: &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_from_sockptr(dst: &min_sec_level, src: optval,
711 size: sizeof(unsigned int));
712 if (ret < 0)
713 goto error;
714 ret = -EINVAL;
715 if (min_sec_level > RXRPC_SECURITY_MAX)
716 goto error;
717 rx->min_sec_level = min_sec_level;
718 goto success;
719
720 case RXRPC_UPGRADEABLE_SERVICE:
721 ret = -EINVAL;
722 if (optlen != sizeof(service_upgrade) ||
723 rx->service_upgrade.from != 0)
724 goto error;
725 ret = -EISCONN;
726 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
727 goto error;
728 ret = -EFAULT;
729 if (copy_from_sockptr(dst: service_upgrade, src: optval,
730 size: sizeof(service_upgrade)) != 0)
731 goto error;
732 ret = -EINVAL;
733 if ((service_upgrade[0] != rx->srx.srx_service ||
734 service_upgrade[1] != rx->second_service) &&
735 (service_upgrade[0] != rx->second_service ||
736 service_upgrade[1] != rx->srx.srx_service))
737 goto error;
738 rx->service_upgrade.from = service_upgrade[0];
739 rx->service_upgrade.to = service_upgrade[1];
740 goto success;
741
742 default:
743 break;
744 }
745 }
746
747success:
748 ret = 0;
749error:
750 release_sock(sk: &rx->sk);
751 return ret;
752}
753
754/*
755 * Get socket options.
756 */
757static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
758 char __user *optval, int __user *_optlen)
759{
760 int optlen;
761
762 if (level != SOL_RXRPC)
763 return -EOPNOTSUPP;
764
765 if (get_user(optlen, _optlen))
766 return -EFAULT;
767
768 switch (optname) {
769 case RXRPC_SUPPORTED_CMSG:
770 if (optlen < sizeof(int))
771 return -ETOOSMALL;
772 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
773 put_user(sizeof(int), _optlen))
774 return -EFAULT;
775 return 0;
776
777 default:
778 return -EOPNOTSUPP;
779 }
780}
781
782/*
783 * permit an RxRPC socket to be polled
784 */
785static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
786 poll_table *wait)
787{
788 struct sock *sk = sock->sk;
789 struct rxrpc_sock *rx = rxrpc_sk(sk);
790 __poll_t mask;
791
792 sock_poll_wait(filp: file, sock, p: wait);
793 mask = 0;
794
795 /* the socket is readable if there are any messages waiting on the Rx
796 * queue */
797 if (!list_empty(head: &rx->recvmsg_q))
798 mask |= EPOLLIN | EPOLLRDNORM;
799
800 /* the socket is writable if there is space to add new data to the
801 * socket; there is no guarantee that any particular call in progress
802 * on the socket may have space in the Tx ACK window */
803 if (rxrpc_writable(sk))
804 mask |= EPOLLOUT | EPOLLWRNORM;
805
806 return mask;
807}
808
809/*
810 * create an RxRPC socket
811 */
812static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
813 int kern)
814{
815 struct rxrpc_net *rxnet;
816 struct rxrpc_sock *rx;
817 struct sock *sk;
818
819 _enter("%p,%d", sock, protocol);
820
821 /* we support transport protocol UDP/UDP6 only */
822 if (protocol != PF_INET &&
823 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
824 return -EPROTONOSUPPORT;
825
826 if (sock->type != SOCK_DGRAM)
827 return -ESOCKTNOSUPPORT;
828
829 sock->ops = &rxrpc_rpc_ops;
830 sock->state = SS_UNCONNECTED;
831
832 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, prot: &rxrpc_proto, kern);
833 if (!sk)
834 return -ENOMEM;
835
836 sock_init_data(sock, sk);
837 sock_set_flag(sk, flag: SOCK_RCU_FREE);
838 sk->sk_state = RXRPC_UNBOUND;
839 sk->sk_write_space = rxrpc_write_space;
840 sk->sk_max_ack_backlog = 0;
841 sk->sk_destruct = rxrpc_sock_destructor;
842
843 rx = rxrpc_sk(sk);
844 rx->family = protocol;
845 rx->calls = RB_ROOT;
846
847 spin_lock_init(&rx->incoming_lock);
848 INIT_LIST_HEAD(list: &rx->sock_calls);
849 INIT_LIST_HEAD(list: &rx->to_be_accepted);
850 INIT_LIST_HEAD(list: &rx->recvmsg_q);
851 spin_lock_init(&rx->recvmsg_lock);
852 rwlock_init(&rx->call_lock);
853 memset(&rx->srx, 0, sizeof(rx->srx));
854
855 rxnet = rxrpc_net(net: sock_net(sk: &rx->sk));
856 timer_reduce(timer: &rxnet->peer_keepalive_timer, expires: jiffies + 1);
857
858 _leave(" = 0 [%p]", rx);
859 return 0;
860}
861
862/*
863 * Kill all the calls on a socket and shut it down.
864 */
865static int rxrpc_shutdown(struct socket *sock, int flags)
866{
867 struct sock *sk = sock->sk;
868 struct rxrpc_sock *rx = rxrpc_sk(sk);
869 int ret = 0;
870
871 _enter("%p,%d", sk, flags);
872
873 if (flags != SHUT_RDWR)
874 return -EOPNOTSUPP;
875 if (sk->sk_state == RXRPC_CLOSE)
876 return -ESHUTDOWN;
877
878 lock_sock(sk);
879
880 if (sk->sk_state < RXRPC_CLOSE) {
881 sk->sk_state = RXRPC_CLOSE;
882 sk->sk_shutdown = SHUTDOWN_MASK;
883 } else {
884 ret = -ESHUTDOWN;
885 }
886
887 rxrpc_discard_prealloc(rx);
888
889 release_sock(sk);
890 return ret;
891}
892
893/*
894 * RxRPC socket destructor
895 */
896static void rxrpc_sock_destructor(struct sock *sk)
897{
898 _enter("%p", sk);
899
900 rxrpc_purge_queue(&sk->sk_receive_queue);
901
902 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
903 WARN_ON(!sk_unhashed(sk));
904 WARN_ON(sk->sk_socket);
905
906 if (!sock_flag(sk, flag: SOCK_DEAD)) {
907 printk("Attempt to release alive rxrpc socket: %p\n", sk);
908 return;
909 }
910}
911
912/*
913 * release an RxRPC socket
914 */
915static int rxrpc_release_sock(struct sock *sk)
916{
917 struct rxrpc_sock *rx = rxrpc_sk(sk);
918
919 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
920
921 /* declare the socket closed for business */
922 sock_orphan(sk);
923 sk->sk_shutdown = SHUTDOWN_MASK;
924
925 /* We want to kill off all connections from a service socket
926 * as fast as possible because we can't share these; client
927 * sockets, on the other hand, can share an endpoint.
928 */
929 switch (sk->sk_state) {
930 case RXRPC_SERVER_BOUND:
931 case RXRPC_SERVER_BOUND2:
932 case RXRPC_SERVER_LISTENING:
933 case RXRPC_SERVER_LISTEN_DISABLED:
934 rx->local->service_closed = true;
935 break;
936 }
937
938 sk->sk_state = RXRPC_CLOSE;
939
940 if (rx->local && rx->local->service == rx) {
941 write_lock(&rx->local->services_lock);
942 rx->local->service = NULL;
943 write_unlock(&rx->local->services_lock);
944 }
945
946 /* try to flush out this socket */
947 rxrpc_discard_prealloc(rx);
948 rxrpc_release_calls_on_socket(rx);
949 flush_workqueue(rxrpc_workqueue);
950 rxrpc_purge_queue(&sk->sk_receive_queue);
951
952 rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock);
953 rxrpc_put_local(rx->local, rxrpc_local_put_release_sock);
954 rx->local = NULL;
955 key_put(key: rx->key);
956 rx->key = NULL;
957 key_put(key: rx->securities);
958 rx->securities = NULL;
959 sock_put(sk);
960
961 _leave(" = 0");
962 return 0;
963}
964
965/*
966 * release an RxRPC BSD socket on close() or equivalent
967 */
968static int rxrpc_release(struct socket *sock)
969{
970 struct sock *sk = sock->sk;
971
972 _enter("%p{%p}", sock, sk);
973
974 if (!sk)
975 return 0;
976
977 sock->sk = NULL;
978
979 return rxrpc_release_sock(sk);
980}
981
982/*
983 * RxRPC network protocol
984 */
985static const struct proto_ops rxrpc_rpc_ops = {
986 .family = PF_RXRPC,
987 .owner = THIS_MODULE,
988 .release = rxrpc_release,
989 .bind = rxrpc_bind,
990 .connect = rxrpc_connect,
991 .socketpair = sock_no_socketpair,
992 .accept = sock_no_accept,
993 .getname = sock_no_getname,
994 .poll = rxrpc_poll,
995 .ioctl = sock_no_ioctl,
996 .listen = rxrpc_listen,
997 .shutdown = rxrpc_shutdown,
998 .setsockopt = rxrpc_setsockopt,
999 .getsockopt = rxrpc_getsockopt,
1000 .sendmsg = rxrpc_sendmsg,
1001 .recvmsg = rxrpc_recvmsg,
1002 .mmap = sock_no_mmap,
1003};
1004
1005static struct proto rxrpc_proto = {
1006 .name = "RXRPC",
1007 .owner = THIS_MODULE,
1008 .obj_size = sizeof(struct rxrpc_sock),
1009 .max_header = sizeof(struct rxrpc_wire_header),
1010};
1011
1012static const struct net_proto_family rxrpc_family_ops = {
1013 .family = PF_RXRPC,
1014 .create = rxrpc_create,
1015 .owner = THIS_MODULE,
1016};
1017
1018/*
1019 * initialise and register the RxRPC protocol
1020 */
1021static int __init af_rxrpc_init(void)
1022{
1023 int ret = -1;
1024
1025 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
1026
1027 ret = -ENOMEM;
1028 rxrpc_gen_version_string();
1029 rxrpc_call_jar = kmem_cache_create(
1030 name: "rxrpc_call_jar", size: sizeof(struct rxrpc_call), align: 0,
1031 SLAB_HWCACHE_ALIGN, NULL);
1032 if (!rxrpc_call_jar) {
1033 pr_notice("Failed to allocate call jar\n");
1034 goto error_call_jar;
1035 }
1036
1037 rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM);
1038 if (!rxrpc_workqueue) {
1039 pr_notice("Failed to allocate work queue\n");
1040 goto error_work_queue;
1041 }
1042
1043 ret = rxrpc_init_security();
1044 if (ret < 0) {
1045 pr_crit("Cannot initialise security\n");
1046 goto error_security;
1047 }
1048
1049 ret = register_pernet_device(&rxrpc_net_ops);
1050 if (ret)
1051 goto error_pernet;
1052
1053 ret = proto_register(prot: &rxrpc_proto, alloc_slab: 1);
1054 if (ret < 0) {
1055 pr_crit("Cannot register protocol\n");
1056 goto error_proto;
1057 }
1058
1059 ret = sock_register(fam: &rxrpc_family_ops);
1060 if (ret < 0) {
1061 pr_crit("Cannot register socket family\n");
1062 goto error_sock;
1063 }
1064
1065 ret = register_key_type(ktype: &key_type_rxrpc);
1066 if (ret < 0) {
1067 pr_crit("Cannot register client key type\n");
1068 goto error_key_type;
1069 }
1070
1071 ret = register_key_type(ktype: &key_type_rxrpc_s);
1072 if (ret < 0) {
1073 pr_crit("Cannot register server key type\n");
1074 goto error_key_type_s;
1075 }
1076
1077 ret = rxrpc_sysctl_init();
1078 if (ret < 0) {
1079 pr_crit("Cannot register sysctls\n");
1080 goto error_sysctls;
1081 }
1082
1083 return 0;
1084
1085error_sysctls:
1086 unregister_key_type(ktype: &key_type_rxrpc_s);
1087error_key_type_s:
1088 unregister_key_type(ktype: &key_type_rxrpc);
1089error_key_type:
1090 sock_unregister(PF_RXRPC);
1091error_sock:
1092 proto_unregister(prot: &rxrpc_proto);
1093error_proto:
1094 unregister_pernet_device(&rxrpc_net_ops);
1095error_pernet:
1096 rxrpc_exit_security();
1097error_security:
1098 destroy_workqueue(wq: rxrpc_workqueue);
1099error_work_queue:
1100 kmem_cache_destroy(s: rxrpc_call_jar);
1101error_call_jar:
1102 return ret;
1103}
1104
1105/*
1106 * unregister the RxRPC protocol
1107 */
1108static void __exit af_rxrpc_exit(void)
1109{
1110 _enter("");
1111 rxrpc_sysctl_exit();
1112 unregister_key_type(ktype: &key_type_rxrpc_s);
1113 unregister_key_type(ktype: &key_type_rxrpc);
1114 sock_unregister(PF_RXRPC);
1115 proto_unregister(prot: &rxrpc_proto);
1116 unregister_pernet_device(&rxrpc_net_ops);
1117 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1118
1119 /* Make sure the local and peer records pinned by any dying connections
1120 * are released.
1121 */
1122 rcu_barrier();
1123
1124 destroy_workqueue(wq: rxrpc_workqueue);
1125 rxrpc_exit_security();
1126 kmem_cache_destroy(s: rxrpc_call_jar);
1127 _leave("");
1128}
1129
1130module_init(af_rxrpc_init);
1131module_exit(af_rxrpc_exit);
1132

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