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