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Commit | Line | Data |
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17926a79 DH |
1 | /* AF_RXRPC implementation |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 | 14 | #include <linux/module.h> |
ce6654cf | 15 | #include <linux/kernel.h> |
17926a79 | 16 | #include <linux/net.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
17926a79 DH |
18 | #include <linux/skbuff.h> |
19 | #include <linux/poll.h> | |
20 | #include <linux/proc_fs.h> | |
76181c13 | 21 | #include <linux/key-type.h> |
457c4cbc | 22 | #include <net/net_namespace.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include "ar-internal.h" | |
26 | ||
27 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
28 | MODULE_AUTHOR("Red Hat, Inc."); | |
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
31 | ||
95c96174 | 32 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 33 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 34 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 | 35 | |
17926a79 DH |
36 | static struct proto rxrpc_proto; |
37 | static const struct proto_ops rxrpc_rpc_ops; | |
38 | ||
39 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 40 | u32 rxrpc_epoch; |
17926a79 DH |
41 | |
42 | /* current debugging ID */ | |
43 | atomic_t rxrpc_debug_id; | |
44 | ||
45 | /* count of skbs currently in use */ | |
46 | atomic_t rxrpc_n_skbs; | |
47 | ||
651350d1 DH |
48 | struct workqueue_struct *rxrpc_workqueue; |
49 | ||
17926a79 DH |
50 | static void rxrpc_sock_destructor(struct sock *); |
51 | ||
52 | /* | |
53 | * see if an RxRPC socket is currently writable | |
54 | */ | |
55 | static inline int rxrpc_writable(struct sock *sk) | |
56 | { | |
57 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
58 | } | |
59 | ||
60 | /* | |
61 | * wait for write bufferage to become available | |
62 | */ | |
63 | static void rxrpc_write_space(struct sock *sk) | |
64 | { | |
65 | _enter("%p", sk); | |
43815482 | 66 | rcu_read_lock(); |
17926a79 | 67 | if (rxrpc_writable(sk)) { |
43815482 ED |
68 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
69 | ||
1ce0bf50 | 70 | if (skwq_has_sleeper(wq)) |
43815482 | 71 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 72 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 73 | } |
43815482 | 74 | rcu_read_unlock(); |
17926a79 DH |
75 | } |
76 | ||
77 | /* | |
78 | * validate an RxRPC address | |
79 | */ | |
80 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
81 | struct sockaddr_rxrpc *srx, | |
82 | int len) | |
83 | { | |
dad8aff7 | 84 | unsigned int tail; |
ab802ee0 | 85 | |
17926a79 DH |
86 | if (len < sizeof(struct sockaddr_rxrpc)) |
87 | return -EINVAL; | |
88 | ||
89 | if (srx->srx_family != AF_RXRPC) | |
90 | return -EAFNOSUPPORT; | |
91 | ||
92 | if (srx->transport_type != SOCK_DGRAM) | |
93 | return -ESOCKTNOSUPPORT; | |
94 | ||
95 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
96 | if (srx->transport_len < sizeof(sa_family_t) || | |
97 | srx->transport_len > len) | |
98 | return -EINVAL; | |
99 | ||
100 | if (srx->transport.family != rx->proto) | |
101 | return -EAFNOSUPPORT; | |
102 | ||
103 | switch (srx->transport.family) { | |
104 | case AF_INET: | |
4f95dd78 DH |
105 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
106 | return -EINVAL; | |
21454aaa | 107 | _debug("INET: %x @ %pI4", |
17926a79 | 108 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 109 | &srx->transport.sin.sin_addr); |
ab802ee0 | 110 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
111 | break; |
112 | ||
113 | case AF_INET6: | |
114 | default: | |
115 | return -EAFNOSUPPORT; | |
116 | } | |
117 | ||
ab802ee0 DH |
118 | if (tail < len) |
119 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
120 | return 0; |
121 | } | |
122 | ||
123 | /* | |
124 | * bind a local address to an RxRPC socket | |
125 | */ | |
126 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
127 | { | |
b4f1342f | 128 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
129 | struct sock *sk = sock->sk; |
130 | struct rxrpc_local *local; | |
131 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
132 | int ret; |
133 | ||
134 | _enter("%p,%p,%d", rx, saddr, len); | |
135 | ||
136 | ret = rxrpc_validate_address(rx, srx, len); | |
137 | if (ret < 0) | |
138 | goto error; | |
139 | ||
140 | lock_sock(&rx->sk); | |
141 | ||
2341e077 | 142 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
143 | ret = -EINVAL; |
144 | goto error_unlock; | |
145 | } | |
146 | ||
147 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
148 | ||
17926a79 DH |
149 | local = rxrpc_lookup_local(&rx->srx); |
150 | if (IS_ERR(local)) { | |
151 | ret = PTR_ERR(local); | |
152 | goto error_unlock; | |
153 | } | |
154 | ||
2341e077 | 155 | if (rx->srx.srx_service) { |
17926a79 DH |
156 | write_lock_bh(&local->services_lock); |
157 | list_for_each_entry(prx, &local->services, listen_link) { | |
2341e077 | 158 | if (prx->srx.srx_service == rx->srx.srx_service) |
17926a79 DH |
159 | goto service_in_use; |
160 | } | |
161 | ||
2341e077 | 162 | rx->local = local; |
17926a79 DH |
163 | list_add_tail(&rx->listen_link, &local->services); |
164 | write_unlock_bh(&local->services_lock); | |
165 | ||
166 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
167 | } else { | |
2341e077 | 168 | rx->local = local; |
17926a79 DH |
169 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
170 | } | |
171 | ||
172 | release_sock(&rx->sk); | |
173 | _leave(" = 0"); | |
174 | return 0; | |
175 | ||
176 | service_in_use: | |
17926a79 | 177 | write_unlock_bh(&local->services_lock); |
2341e077 DH |
178 | rxrpc_put_local(local); |
179 | ret = -EADDRINUSE; | |
17926a79 DH |
180 | error_unlock: |
181 | release_sock(&rx->sk); | |
182 | error: | |
183 | _leave(" = %d", ret); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * set the number of pending calls permitted on a listening socket | |
189 | */ | |
190 | static int rxrpc_listen(struct socket *sock, int backlog) | |
191 | { | |
192 | struct sock *sk = sock->sk; | |
193 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
0e119b41 | 194 | unsigned int max; |
17926a79 DH |
195 | int ret; |
196 | ||
197 | _enter("%p,%d", rx, backlog); | |
198 | ||
199 | lock_sock(&rx->sk); | |
200 | ||
201 | switch (rx->sk.sk_state) { | |
2341e077 | 202 | case RXRPC_UNBOUND: |
17926a79 DH |
203 | ret = -EADDRNOTAVAIL; |
204 | break; | |
17926a79 DH |
205 | case RXRPC_SERVER_BOUND: |
206 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
207 | max = READ_ONCE(rxrpc_max_backlog); |
208 | ret = -EINVAL; | |
209 | if (backlog == INT_MAX) | |
210 | backlog = max; | |
211 | else if (backlog < 0 || backlog > max) | |
212 | break; | |
17926a79 DH |
213 | sk->sk_max_ack_backlog = backlog; |
214 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
215 | ret = 0; | |
216 | break; | |
0e119b41 DH |
217 | default: |
218 | ret = -EBUSY; | |
219 | break; | |
17926a79 DH |
220 | } |
221 | ||
222 | release_sock(&rx->sk); | |
223 | _leave(" = %d", ret); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * find a transport by address | |
229 | */ | |
2341e077 DH |
230 | struct rxrpc_transport *rxrpc_name_to_transport(struct rxrpc_sock *rx, |
231 | struct sockaddr *addr, | |
232 | int addr_len, int flags, | |
233 | gfp_t gfp) | |
17926a79 DH |
234 | { |
235 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
236 | struct rxrpc_transport *trans; | |
17926a79 DH |
237 | struct rxrpc_peer *peer; |
238 | ||
239 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
240 | ||
241 | ASSERT(rx->local != NULL); | |
17926a79 DH |
242 | |
243 | if (rx->srx.transport_type != srx->transport_type) | |
244 | return ERR_PTR(-ESOCKTNOSUPPORT); | |
245 | if (rx->srx.transport.family != srx->transport.family) | |
246 | return ERR_PTR(-EAFNOSUPPORT); | |
247 | ||
248 | /* find a remote transport endpoint from the local one */ | |
be6e6707 | 249 | peer = rxrpc_lookup_peer(rx->local, srx, gfp); |
0e4699e4 DC |
250 | if (!peer) |
251 | return ERR_PTR(-ENOMEM); | |
17926a79 DH |
252 | |
253 | /* find a transport */ | |
651350d1 | 254 | trans = rxrpc_get_transport(rx->local, peer, gfp); |
17926a79 DH |
255 | rxrpc_put_peer(peer); |
256 | _leave(" = %p", trans); | |
257 | return trans; | |
258 | } | |
259 | ||
651350d1 DH |
260 | /** |
261 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
262 | * @sock: The socket on which to make the call | |
2341e077 | 263 | * @srx: The address of the peer to contact |
651350d1 DH |
264 | * @key: The security context to use (defaults to socket setting) |
265 | * @user_call_ID: The ID to use | |
266 | * | |
267 | * Allow a kernel service to begin a call on the nominated socket. This just | |
268 | * sets up all the internal tracking structures and allocates connection and | |
269 | * call IDs as appropriate. The call to be used is returned. | |
270 | * | |
271 | * The default socket destination address and security may be overridden by | |
272 | * supplying @srx and @key. | |
273 | */ | |
274 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
275 | struct sockaddr_rxrpc *srx, | |
276 | struct key *key, | |
277 | unsigned long user_call_ID, | |
278 | gfp_t gfp) | |
279 | { | |
280 | struct rxrpc_conn_bundle *bundle; | |
281 | struct rxrpc_transport *trans; | |
282 | struct rxrpc_call *call; | |
283 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
651350d1 DH |
284 | |
285 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
286 | ||
287 | lock_sock(&rx->sk); | |
288 | ||
2341e077 DH |
289 | trans = rxrpc_name_to_transport(rx, (struct sockaddr *)srx, |
290 | sizeof(*srx), 0, gfp); | |
291 | if (IS_ERR(trans)) { | |
292 | call = ERR_CAST(trans); | |
293 | trans = NULL; | |
294 | goto out_notrans; | |
651350d1 DH |
295 | } |
296 | ||
651350d1 DH |
297 | if (!key) |
298 | key = rx->key; | |
146aa8b1 | 299 | if (key && !key->payload.data[0]) |
651350d1 DH |
300 | key = NULL; /* a no-security key */ |
301 | ||
0d12f8a4 | 302 | bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp); |
651350d1 | 303 | if (IS_ERR(bundle)) { |
e231c2ee | 304 | call = ERR_CAST(bundle); |
651350d1 DH |
305 | goto out; |
306 | } | |
307 | ||
2341e077 | 308 | call = rxrpc_new_client_call(rx, trans, bundle, user_call_ID, gfp); |
651350d1 DH |
309 | rxrpc_put_bundle(trans, bundle); |
310 | out: | |
311 | rxrpc_put_transport(trans); | |
15bde727 | 312 | out_notrans: |
651350d1 DH |
313 | release_sock(&rx->sk); |
314 | _leave(" = %p", call); | |
315 | return call; | |
316 | } | |
651350d1 DH |
317 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
318 | ||
319 | /** | |
320 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
321 | * @call: The call to end | |
322 | * | |
323 | * Allow a kernel service to end a call it was using. The call must be | |
324 | * complete before this is called (the call should be aborted if necessary). | |
325 | */ | |
326 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
327 | { | |
328 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
329 | rxrpc_remove_user_ID(call->socket, call); | |
330 | rxrpc_put_call(call); | |
331 | } | |
651350d1 DH |
332 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
333 | ||
334 | /** | |
335 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
336 | * @sock: The socket to intercept received messages on | |
337 | * @interceptor: The function to pass the messages to | |
338 | * | |
339 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
340 | * RxRPC socket. They get passed to the specified function instead. | |
341 | * @interceptor should free the socket buffers it is given. @interceptor is | |
342 | * called with the socket receive queue spinlock held and softirqs disabled - | |
343 | * this ensures that the messages will be delivered in the right order. | |
344 | */ | |
345 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
346 | rxrpc_interceptor_t interceptor) | |
347 | { | |
348 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
349 | ||
350 | _enter(""); | |
351 | rx->interceptor = interceptor; | |
352 | } | |
353 | ||
354 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
355 | ||
17926a79 DH |
356 | /* |
357 | * connect an RxRPC socket | |
358 | * - this just targets it at a specific destination; no actual connection | |
359 | * negotiation takes place | |
360 | */ | |
361 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
362 | int addr_len, int flags) | |
363 | { | |
2341e077 DH |
364 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
365 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
366 | int ret; |
367 | ||
368 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
369 | ||
370 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
371 | if (ret < 0) { | |
372 | _leave(" = %d [bad addr]", ret); | |
373 | return ret; | |
374 | } | |
375 | ||
376 | lock_sock(&rx->sk); | |
377 | ||
2341e077 DH |
378 | ret = -EISCONN; |
379 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
380 | goto error; | |
381 | ||
17926a79 | 382 | switch (rx->sk.sk_state) { |
2341e077 DH |
383 | case RXRPC_UNBOUND: |
384 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
385 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
386 | case RXRPC_CLIENT_BOUND: |
387 | break; | |
17926a79 | 388 | default: |
2341e077 DH |
389 | ret = -EBUSY; |
390 | goto error; | |
17926a79 DH |
391 | } |
392 | ||
2341e077 DH |
393 | rx->connect_srx = *srx; |
394 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
395 | ret = 0; | |
17926a79 | 396 | |
2341e077 | 397 | error: |
17926a79 | 398 | release_sock(&rx->sk); |
2341e077 | 399 | return ret; |
17926a79 DH |
400 | } |
401 | ||
402 | /* | |
403 | * send a message through an RxRPC socket | |
404 | * - in a client this does a number of things: | |
405 | * - finds/sets up a connection for the security specified (if any) | |
406 | * - initiates a call (ID in control data) | |
407 | * - ends the request phase of a call (if MSG_MORE is not set) | |
408 | * - sends a call data packet | |
409 | * - may send an abort (abort code in control data) | |
410 | */ | |
1b784140 | 411 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 412 | { |
2341e077 | 413 | struct rxrpc_local *local; |
17926a79 DH |
414 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
415 | int ret; | |
416 | ||
417 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
418 | ||
419 | if (m->msg_flags & MSG_OOB) | |
420 | return -EOPNOTSUPP; | |
421 | ||
422 | if (m->msg_name) { | |
423 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
424 | if (ret < 0) { | |
425 | _leave(" = %d [bad addr]", ret); | |
426 | return ret; | |
427 | } | |
428 | } | |
429 | ||
17926a79 DH |
430 | lock_sock(&rx->sk); |
431 | ||
17926a79 | 432 | switch (rx->sk.sk_state) { |
2341e077 DH |
433 | case RXRPC_UNBOUND: |
434 | local = rxrpc_lookup_local(&rx->srx); | |
435 | if (IS_ERR(local)) { | |
436 | ret = PTR_ERR(local); | |
437 | goto error_unlock; | |
17926a79 | 438 | } |
2341e077 DH |
439 | |
440 | rx->local = local; | |
441 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
442 | /* Fall through */ | |
443 | ||
444 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 445 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
446 | if (!m->msg_name && |
447 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
448 | m->msg_name = &rx->connect_srx; | |
449 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 450 | } |
2341e077 DH |
451 | case RXRPC_SERVER_BOUND: |
452 | case RXRPC_SERVER_LISTENING: | |
453 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
454 | break; |
455 | default: | |
2341e077 | 456 | ret = -EINVAL; |
17926a79 DH |
457 | break; |
458 | } | |
459 | ||
2341e077 | 460 | error_unlock: |
17926a79 | 461 | release_sock(&rx->sk); |
17926a79 DH |
462 | _leave(" = %d", ret); |
463 | return ret; | |
464 | } | |
465 | ||
466 | /* | |
467 | * set RxRPC socket options | |
468 | */ | |
469 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 470 | char __user *optval, unsigned int optlen) |
17926a79 DH |
471 | { |
472 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 473 | unsigned int min_sec_level; |
17926a79 DH |
474 | int ret; |
475 | ||
476 | _enter(",%d,%d,,%d", level, optname, optlen); | |
477 | ||
478 | lock_sock(&rx->sk); | |
479 | ret = -EOPNOTSUPP; | |
480 | ||
481 | if (level == SOL_RXRPC) { | |
482 | switch (optname) { | |
483 | case RXRPC_EXCLUSIVE_CONNECTION: | |
484 | ret = -EINVAL; | |
485 | if (optlen != 0) | |
486 | goto error; | |
487 | ret = -EISCONN; | |
2341e077 | 488 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
489 | goto error; |
490 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
491 | goto success; | |
492 | ||
493 | case RXRPC_SECURITY_KEY: | |
494 | ret = -EINVAL; | |
495 | if (rx->key) | |
496 | goto error; | |
497 | ret = -EISCONN; | |
2341e077 | 498 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
499 | goto error; |
500 | ret = rxrpc_request_key(rx, optval, optlen); | |
501 | goto error; | |
502 | ||
503 | case RXRPC_SECURITY_KEYRING: | |
504 | ret = -EINVAL; | |
505 | if (rx->key) | |
506 | goto error; | |
507 | ret = -EISCONN; | |
2341e077 | 508 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
509 | goto error; |
510 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
511 | goto error; | |
512 | ||
513 | case RXRPC_MIN_SECURITY_LEVEL: | |
514 | ret = -EINVAL; | |
95c96174 | 515 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
516 | goto error; |
517 | ret = -EISCONN; | |
2341e077 | 518 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
519 | goto error; |
520 | ret = get_user(min_sec_level, | |
95c96174 | 521 | (unsigned int __user *) optval); |
17926a79 DH |
522 | if (ret < 0) |
523 | goto error; | |
524 | ret = -EINVAL; | |
525 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
526 | goto error; | |
527 | rx->min_sec_level = min_sec_level; | |
528 | goto success; | |
529 | ||
530 | default: | |
531 | break; | |
532 | } | |
533 | } | |
534 | ||
535 | success: | |
536 | ret = 0; | |
537 | error: | |
538 | release_sock(&rx->sk); | |
539 | return ret; | |
540 | } | |
541 | ||
542 | /* | |
543 | * permit an RxRPC socket to be polled | |
544 | */ | |
545 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
546 | poll_table *wait) | |
547 | { | |
548 | unsigned int mask; | |
549 | struct sock *sk = sock->sk; | |
550 | ||
aa395145 | 551 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
552 | mask = 0; |
553 | ||
554 | /* the socket is readable if there are any messages waiting on the Rx | |
555 | * queue */ | |
556 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
557 | mask |= POLLIN | POLLRDNORM; | |
558 | ||
559 | /* the socket is writable if there is space to add new data to the | |
560 | * socket; there is no guarantee that any particular call in progress | |
561 | * on the socket may have space in the Tx ACK window */ | |
562 | if (rxrpc_writable(sk)) | |
563 | mask |= POLLOUT | POLLWRNORM; | |
564 | ||
565 | return mask; | |
566 | } | |
567 | ||
568 | /* | |
569 | * create an RxRPC socket | |
570 | */ | |
3f378b68 EP |
571 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
572 | int kern) | |
17926a79 DH |
573 | { |
574 | struct rxrpc_sock *rx; | |
575 | struct sock *sk; | |
576 | ||
577 | _enter("%p,%d", sock, protocol); | |
578 | ||
09ad9bc7 | 579 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
580 | return -EAFNOSUPPORT; |
581 | ||
b4f1342f | 582 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
583 | if (protocol != PF_INET) |
584 | return -EPROTONOSUPPORT; | |
585 | ||
586 | if (sock->type != SOCK_DGRAM) | |
587 | return -ESOCKTNOSUPPORT; | |
588 | ||
589 | sock->ops = &rxrpc_rpc_ops; | |
590 | sock->state = SS_UNCONNECTED; | |
591 | ||
11aa9c28 | 592 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
593 | if (!sk) |
594 | return -ENOMEM; | |
595 | ||
596 | sock_init_data(sock, sk); | |
2341e077 | 597 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 598 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 599 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
600 | sk->sk_destruct = rxrpc_sock_destructor; |
601 | ||
602 | rx = rxrpc_sk(sk); | |
603 | rx->proto = protocol; | |
604 | rx->calls = RB_ROOT; | |
605 | ||
606 | INIT_LIST_HEAD(&rx->listen_link); | |
607 | INIT_LIST_HEAD(&rx->secureq); | |
608 | INIT_LIST_HEAD(&rx->acceptq); | |
609 | rwlock_init(&rx->call_lock); | |
610 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
611 | ||
612 | _leave(" = 0 [%p]", rx); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /* | |
617 | * RxRPC socket destructor | |
618 | */ | |
619 | static void rxrpc_sock_destructor(struct sock *sk) | |
620 | { | |
621 | _enter("%p", sk); | |
622 | ||
623 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
624 | ||
547b792c IJ |
625 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
626 | WARN_ON(!sk_unhashed(sk)); | |
627 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
628 | |
629 | if (!sock_flag(sk, SOCK_DEAD)) { | |
630 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
631 | return; | |
632 | } | |
633 | } | |
634 | ||
635 | /* | |
636 | * release an RxRPC socket | |
637 | */ | |
638 | static int rxrpc_release_sock(struct sock *sk) | |
639 | { | |
640 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
641 | ||
642 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
643 | ||
644 | /* declare the socket closed for business */ | |
645 | sock_orphan(sk); | |
646 | sk->sk_shutdown = SHUTDOWN_MASK; | |
647 | ||
648 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
649 | sk->sk_state = RXRPC_CLOSE; | |
650 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
651 | ||
652 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
653 | ||
654 | if (!list_empty(&rx->listen_link)) { | |
655 | write_lock_bh(&rx->local->services_lock); | |
656 | list_del(&rx->listen_link); | |
657 | write_unlock_bh(&rx->local->services_lock); | |
658 | } | |
659 | ||
660 | /* try to flush out this socket */ | |
661 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 662 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
663 | rxrpc_purge_queue(&sk->sk_receive_queue); |
664 | ||
665 | if (rx->conn) { | |
666 | rxrpc_put_connection(rx->conn); | |
667 | rx->conn = NULL; | |
668 | } | |
669 | ||
17926a79 DH |
670 | if (rx->local) { |
671 | rxrpc_put_local(rx->local); | |
672 | rx->local = NULL; | |
673 | } | |
674 | ||
675 | key_put(rx->key); | |
676 | rx->key = NULL; | |
677 | key_put(rx->securities); | |
678 | rx->securities = NULL; | |
679 | sock_put(sk); | |
680 | ||
681 | _leave(" = 0"); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | /* | |
686 | * release an RxRPC BSD socket on close() or equivalent | |
687 | */ | |
688 | static int rxrpc_release(struct socket *sock) | |
689 | { | |
690 | struct sock *sk = sock->sk; | |
691 | ||
692 | _enter("%p{%p}", sock, sk); | |
693 | ||
694 | if (!sk) | |
695 | return 0; | |
696 | ||
697 | sock->sk = NULL; | |
698 | ||
699 | return rxrpc_release_sock(sk); | |
700 | } | |
701 | ||
702 | /* | |
703 | * RxRPC network protocol | |
704 | */ | |
705 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 706 | .family = PF_RXRPC, |
17926a79 DH |
707 | .owner = THIS_MODULE, |
708 | .release = rxrpc_release, | |
709 | .bind = rxrpc_bind, | |
710 | .connect = rxrpc_connect, | |
711 | .socketpair = sock_no_socketpair, | |
712 | .accept = sock_no_accept, | |
713 | .getname = sock_no_getname, | |
714 | .poll = rxrpc_poll, | |
715 | .ioctl = sock_no_ioctl, | |
716 | .listen = rxrpc_listen, | |
717 | .shutdown = sock_no_shutdown, | |
718 | .setsockopt = rxrpc_setsockopt, | |
719 | .getsockopt = sock_no_getsockopt, | |
720 | .sendmsg = rxrpc_sendmsg, | |
721 | .recvmsg = rxrpc_recvmsg, | |
722 | .mmap = sock_no_mmap, | |
723 | .sendpage = sock_no_sendpage, | |
724 | }; | |
725 | ||
726 | static struct proto rxrpc_proto = { | |
727 | .name = "RXRPC", | |
728 | .owner = THIS_MODULE, | |
729 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 730 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
731 | }; |
732 | ||
ec1b4cf7 | 733 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
734 | .family = PF_RXRPC, |
735 | .create = rxrpc_create, | |
736 | .owner = THIS_MODULE, | |
737 | }; | |
738 | ||
739 | /* | |
740 | * initialise and register the RxRPC protocol | |
741 | */ | |
742 | static int __init af_rxrpc_init(void) | |
743 | { | |
17926a79 DH |
744 | int ret = -1; |
745 | ||
ce6654cf | 746 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 747 | |
0d12f8a4 | 748 | rxrpc_epoch = get_seconds(); |
17926a79 | 749 | |
651350d1 | 750 | ret = -ENOMEM; |
17926a79 DH |
751 | rxrpc_call_jar = kmem_cache_create( |
752 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 753 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 754 | if (!rxrpc_call_jar) { |
9b6d5398 | 755 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
756 | goto error_call_jar; |
757 | } | |
758 | ||
e1fcc7e2 | 759 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 760 | if (!rxrpc_workqueue) { |
9b6d5398 | 761 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
762 | goto error_work_queue; |
763 | } | |
764 | ||
648af7fc DH |
765 | ret = rxrpc_init_security(); |
766 | if (ret < 0) { | |
9b6d5398 | 767 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
768 | goto error_security; |
769 | } | |
770 | ||
17926a79 | 771 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 772 | if (ret < 0) { |
9b6d5398 | 773 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
774 | goto error_proto; |
775 | } | |
776 | ||
777 | ret = sock_register(&rxrpc_family_ops); | |
778 | if (ret < 0) { | |
9b6d5398 | 779 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
780 | goto error_sock; |
781 | } | |
782 | ||
783 | ret = register_key_type(&key_type_rxrpc); | |
784 | if (ret < 0) { | |
9b6d5398 | 785 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
786 | goto error_key_type; |
787 | } | |
788 | ||
789 | ret = register_key_type(&key_type_rxrpc_s); | |
790 | if (ret < 0) { | |
9b6d5398 | 791 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
792 | goto error_key_type_s; |
793 | } | |
794 | ||
5873c083 DH |
795 | ret = rxrpc_sysctl_init(); |
796 | if (ret < 0) { | |
9b6d5398 | 797 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
798 | goto error_sysctls; |
799 | } | |
800 | ||
17926a79 | 801 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
802 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
803 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
804 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
805 | #endif |
806 | return 0; | |
807 | ||
5873c083 DH |
808 | error_sysctls: |
809 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
810 | error_key_type_s: |
811 | unregister_key_type(&key_type_rxrpc); | |
812 | error_key_type: | |
813 | sock_unregister(PF_RXRPC); | |
814 | error_sock: | |
815 | proto_unregister(&rxrpc_proto); | |
816 | error_proto: | |
651350d1 | 817 | destroy_workqueue(rxrpc_workqueue); |
648af7fc DH |
818 | error_security: |
819 | rxrpc_exit_security(); | |
651350d1 | 820 | error_work_queue: |
17926a79 DH |
821 | kmem_cache_destroy(rxrpc_call_jar); |
822 | error_call_jar: | |
823 | return ret; | |
824 | } | |
825 | ||
826 | /* | |
827 | * unregister the RxRPC protocol | |
828 | */ | |
829 | static void __exit af_rxrpc_exit(void) | |
830 | { | |
831 | _enter(""); | |
5873c083 | 832 | rxrpc_sysctl_exit(); |
17926a79 DH |
833 | unregister_key_type(&key_type_rxrpc_s); |
834 | unregister_key_type(&key_type_rxrpc); | |
835 | sock_unregister(PF_RXRPC); | |
836 | proto_unregister(&rxrpc_proto); | |
837 | rxrpc_destroy_all_calls(); | |
838 | rxrpc_destroy_all_connections(); | |
839 | rxrpc_destroy_all_transports(); | |
17926a79 DH |
840 | |
841 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
842 | ||
4f95dd78 DH |
843 | /* We need to flush the scheduled work twice because the local endpoint |
844 | * records involve a work item in their destruction as they can only be | |
845 | * destroyed from process context. However, a connection may have a | |
846 | * work item outstanding - and this will pin the local endpoint record | |
847 | * until the connection goes away. | |
848 | * | |
849 | * Peers don't pin locals and calls pin sockets - which prevents the | |
850 | * module from being unloaded - so we should only need two flushes. | |
851 | */ | |
17926a79 | 852 | _debug("flush scheduled work"); |
651350d1 | 853 | flush_workqueue(rxrpc_workqueue); |
4f95dd78 DH |
854 | _debug("flush scheduled work 2"); |
855 | flush_workqueue(rxrpc_workqueue); | |
856 | _debug("synchronise RCU"); | |
857 | rcu_barrier(); | |
858 | _debug("destroy locals"); | |
859 | rxrpc_destroy_all_locals(); | |
860 | ||
ece31ffd G |
861 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
862 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 863 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 864 | rxrpc_exit_security(); |
17926a79 DH |
865 | kmem_cache_destroy(rxrpc_call_jar); |
866 | _leave(""); | |
867 | } | |
868 | ||
869 | module_init(af_rxrpc_init); | |
870 | module_exit(af_rxrpc_exit); |