1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* AF_RXRPC implementation |
3 | * |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
5 | * Written by David Howells (dhowells@redhat.com) |
6 | */ |
7 | |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/net.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/random.h> |
16 | #include <linux/poll.h> |
17 | #include <linux/proc_fs.h> |
18 | #include <linux/key-type.h> |
19 | #include <net/net_namespace.h> |
20 | #include <net/sock.h> |
21 | #include <net/af_rxrpc.h> |
22 | #define CREATE_TRACE_POINTS |
23 | #include "ar-internal.h" |
24 | |
25 | MODULE_DESCRIPTION("RxRPC network protocol" ); |
26 | MODULE_AUTHOR("Red Hat, Inc." ); |
27 | MODULE_LICENSE("GPL" ); |
28 | MODULE_ALIAS_NETPROTO(PF_RXRPC); |
29 | |
30 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
31 | module_param_named(debug, rxrpc_debug, uint, 0644); |
32 | MODULE_PARM_DESC(debug, "RxRPC debugging mask" ); |
33 | |
34 | static struct proto rxrpc_proto; |
35 | static const struct proto_ops rxrpc_rpc_ops; |
36 | |
37 | /* current debugging ID */ |
38 | atomic_t rxrpc_debug_id; |
39 | EXPORT_SYMBOL(rxrpc_debug_id); |
40 | |
41 | /* count of skbs currently in use */ |
42 | atomic_t rxrpc_n_rx_skbs; |
43 | |
44 | struct workqueue_struct *rxrpc_workqueue; |
45 | |
46 | static void rxrpc_sock_destructor(struct sock *); |
47 | |
48 | /* |
49 | * see if an RxRPC socket is currently writable |
50 | */ |
51 | static inline int rxrpc_writable(struct sock *sk) |
52 | { |
53 | return refcount_read(r: &sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; |
54 | } |
55 | |
56 | /* |
57 | * wait for write bufferage to become available |
58 | */ |
59 | static void rxrpc_write_space(struct sock *sk) |
60 | { |
61 | _enter("%p" , sk); |
62 | rcu_read_lock(); |
63 | if (rxrpc_writable(sk)) { |
64 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
65 | |
66 | if (skwq_has_sleeper(wq)) |
67 | wake_up_interruptible(&wq->wait); |
68 | sk_wake_async(sk, how: SOCK_WAKE_SPACE, POLL_OUT); |
69 | } |
70 | rcu_read_unlock(); |
71 | } |
72 | |
73 | /* |
74 | * validate an RxRPC address |
75 | */ |
76 | static int rxrpc_validate_address(struct rxrpc_sock *rx, |
77 | struct sockaddr_rxrpc *srx, |
78 | int len) |
79 | { |
80 | unsigned int tail; |
81 | |
82 | if (len < sizeof(struct sockaddr_rxrpc)) |
83 | return -EINVAL; |
84 | |
85 | if (srx->srx_family != AF_RXRPC) |
86 | return -EAFNOSUPPORT; |
87 | |
88 | if (srx->transport_type != SOCK_DGRAM) |
89 | return -ESOCKTNOSUPPORT; |
90 | |
91 | len -= offsetof(struct sockaddr_rxrpc, transport); |
92 | if (srx->transport_len < sizeof(sa_family_t) || |
93 | srx->transport_len > len) |
94 | return -EINVAL; |
95 | |
96 | 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 | */ |
130 | static 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 | |
195 | service_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; |
200 | error_unlock: |
201 | release_sock(sk: &rx->sk); |
202 | error: |
203 | _leave(" = %d" , ret); |
204 | return ret; |
205 | } |
206 | |
207 | /* |
208 | * set the number of pending calls permitted on a listening socket |
209 | */ |
210 | static 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 | */ |
270 | struct 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 | } |
282 | EXPORT_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 | */ |
290 | struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer) |
291 | { |
292 | return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL; |
293 | } |
294 | EXPORT_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 | */ |
300 | void rxrpc_kernel_put_peer(struct rxrpc_peer *peer) |
301 | { |
302 | rxrpc_put_peer(peer, rxrpc_peer_put_application); |
303 | } |
304 | EXPORT_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 | */ |
328 | struct 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 | } |
383 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
384 | |
385 | /* |
386 | * Dummy function used to stop the notifier talking to recvmsg(). |
387 | */ |
388 | static 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 | */ |
401 | void 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 | } |
418 | EXPORT_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 | */ |
427 | void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call) |
428 | { |
429 | rxrpc_put_call(call, rxrpc_call_put_kernel); |
430 | } |
431 | EXPORT_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 | */ |
441 | bool 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 | } |
450 | EXPORT_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 | */ |
460 | u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call) |
461 | { |
462 | return call->conn->proto.epoch; |
463 | } |
464 | EXPORT_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 | */ |
474 | void 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 | } |
484 | EXPORT_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 | */ |
495 | void 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 | } |
509 | EXPORT_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 | */ |
516 | static 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 | |
553 | error: |
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 | */ |
567 | static 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 | |
635 | error_unlock: |
636 | release_sock(sk: &rx->sk); |
637 | out: |
638 | _leave(" = %d" , ret); |
639 | return ret; |
640 | } |
641 | |
642 | int 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 | } |
653 | EXPORT_SYMBOL(rxrpc_sock_set_min_security_level); |
654 | |
655 | /* |
656 | * set RxRPC socket options |
657 | */ |
658 | static 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 | |
747 | success: |
748 | ret = 0; |
749 | error: |
750 | release_sock(sk: &rx->sk); |
751 | return ret; |
752 | } |
753 | |
754 | /* |
755 | * Get socket options. |
756 | */ |
757 | static 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 | */ |
785 | static __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 | */ |
812 | static 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 | */ |
865 | static 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 | */ |
896 | static 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 | */ |
915 | static 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 | */ |
968 | static 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 | */ |
985 | static 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 | |
1005 | static 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 | |
1012 | static 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 | */ |
1021 | static 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 | |
1085 | error_sysctls: |
1086 | unregister_key_type(ktype: &key_type_rxrpc_s); |
1087 | error_key_type_s: |
1088 | unregister_key_type(ktype: &key_type_rxrpc); |
1089 | error_key_type: |
1090 | sock_unregister(PF_RXRPC); |
1091 | error_sock: |
1092 | proto_unregister(prot: &rxrpc_proto); |
1093 | error_proto: |
1094 | unregister_pernet_device(&rxrpc_net_ops); |
1095 | error_pernet: |
1096 | rxrpc_exit_security(); |
1097 | error_security: |
1098 | destroy_workqueue(wq: rxrpc_workqueue); |
1099 | error_work_queue: |
1100 | kmem_cache_destroy(s: rxrpc_call_jar); |
1101 | error_call_jar: |
1102 | return ret; |
1103 | } |
1104 | |
1105 | /* |
1106 | * unregister the RxRPC protocol |
1107 | */ |
1108 | static 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 | |
1130 | module_init(af_rxrpc_init); |
1131 | module_exit(af_rxrpc_exit); |
1132 | |