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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> | |
df844fd4 | 25 | #define CREATE_TRACE_POINTS |
17926a79 DH |
26 | #include "ar-internal.h" |
27 | ||
28 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
29 | MODULE_AUTHOR("Red Hat, Inc."); | |
30 | MODULE_LICENSE("GPL"); | |
31 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
32 | ||
95c96174 | 33 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 34 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 35 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 | 36 | |
17926a79 DH |
37 | static struct proto rxrpc_proto; |
38 | static const struct proto_ops rxrpc_rpc_ops; | |
39 | ||
40 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 41 | u32 rxrpc_epoch; |
17926a79 DH |
42 | |
43 | /* current debugging ID */ | |
44 | atomic_t rxrpc_debug_id; | |
45 | ||
46 | /* count of skbs currently in use */ | |
47 | atomic_t rxrpc_n_skbs; | |
48 | ||
651350d1 DH |
49 | struct workqueue_struct *rxrpc_workqueue; |
50 | ||
17926a79 DH |
51 | static void rxrpc_sock_destructor(struct sock *); |
52 | ||
53 | /* | |
54 | * see if an RxRPC socket is currently writable | |
55 | */ | |
56 | static inline int rxrpc_writable(struct sock *sk) | |
57 | { | |
58 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
59 | } | |
60 | ||
61 | /* | |
62 | * wait for write bufferage to become available | |
63 | */ | |
64 | static void rxrpc_write_space(struct sock *sk) | |
65 | { | |
66 | _enter("%p", sk); | |
43815482 | 67 | rcu_read_lock(); |
17926a79 | 68 | if (rxrpc_writable(sk)) { |
43815482 ED |
69 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
70 | ||
1ce0bf50 | 71 | if (skwq_has_sleeper(wq)) |
43815482 | 72 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 73 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 74 | } |
43815482 | 75 | rcu_read_unlock(); |
17926a79 DH |
76 | } |
77 | ||
78 | /* | |
79 | * validate an RxRPC address | |
80 | */ | |
81 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
82 | struct sockaddr_rxrpc *srx, | |
83 | int len) | |
84 | { | |
dad8aff7 | 85 | unsigned int tail; |
ab802ee0 | 86 | |
17926a79 DH |
87 | if (len < sizeof(struct sockaddr_rxrpc)) |
88 | return -EINVAL; | |
89 | ||
90 | if (srx->srx_family != AF_RXRPC) | |
91 | return -EAFNOSUPPORT; | |
92 | ||
93 | if (srx->transport_type != SOCK_DGRAM) | |
94 | return -ESOCKTNOSUPPORT; | |
95 | ||
96 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
97 | if (srx->transport_len < sizeof(sa_family_t) || | |
98 | srx->transport_len > len) | |
99 | return -EINVAL; | |
100 | ||
19ffa01c | 101 | if (srx->transport.family != rx->family) |
17926a79 DH |
102 | return -EAFNOSUPPORT; |
103 | ||
104 | switch (srx->transport.family) { | |
105 | case AF_INET: | |
4f95dd78 DH |
106 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
107 | return -EINVAL; | |
21454aaa | 108 | _debug("INET: %x @ %pI4", |
17926a79 | 109 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 110 | &srx->transport.sin.sin_addr); |
ab802ee0 | 111 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
112 | break; |
113 | ||
114 | case AF_INET6: | |
115 | default: | |
116 | return -EAFNOSUPPORT; | |
117 | } | |
118 | ||
ab802ee0 DH |
119 | if (tail < len) |
120 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
121 | return 0; |
122 | } | |
123 | ||
124 | /* | |
125 | * bind a local address to an RxRPC socket | |
126 | */ | |
127 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
128 | { | |
b4f1342f | 129 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
130 | struct sock *sk = sock->sk; |
131 | struct rxrpc_local *local; | |
132 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
133 | int ret; |
134 | ||
135 | _enter("%p,%p,%d", rx, saddr, len); | |
136 | ||
137 | ret = rxrpc_validate_address(rx, srx, len); | |
138 | if (ret < 0) | |
139 | goto error; | |
140 | ||
141 | lock_sock(&rx->sk); | |
142 | ||
2341e077 | 143 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
144 | ret = -EINVAL; |
145 | goto error_unlock; | |
146 | } | |
147 | ||
148 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
149 | ||
17926a79 DH |
150 | local = rxrpc_lookup_local(&rx->srx); |
151 | if (IS_ERR(local)) { | |
152 | ret = PTR_ERR(local); | |
153 | goto error_unlock; | |
154 | } | |
155 | ||
2341e077 | 156 | if (rx->srx.srx_service) { |
17926a79 DH |
157 | write_lock_bh(&local->services_lock); |
158 | list_for_each_entry(prx, &local->services, listen_link) { | |
2341e077 | 159 | if (prx->srx.srx_service == rx->srx.srx_service) |
17926a79 DH |
160 | goto service_in_use; |
161 | } | |
162 | ||
2341e077 | 163 | rx->local = local; |
17926a79 DH |
164 | list_add_tail(&rx->listen_link, &local->services); |
165 | write_unlock_bh(&local->services_lock); | |
166 | ||
167 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
168 | } else { | |
2341e077 | 169 | rx->local = local; |
17926a79 DH |
170 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
171 | } | |
172 | ||
173 | release_sock(&rx->sk); | |
174 | _leave(" = 0"); | |
175 | return 0; | |
176 | ||
177 | service_in_use: | |
17926a79 | 178 | write_unlock_bh(&local->services_lock); |
2341e077 DH |
179 | rxrpc_put_local(local); |
180 | ret = -EADDRINUSE; | |
17926a79 DH |
181 | error_unlock: |
182 | release_sock(&rx->sk); | |
183 | error: | |
184 | _leave(" = %d", ret); | |
185 | return ret; | |
186 | } | |
187 | ||
188 | /* | |
189 | * set the number of pending calls permitted on a listening socket | |
190 | */ | |
191 | static int rxrpc_listen(struct socket *sock, int backlog) | |
192 | { | |
193 | struct sock *sk = sock->sk; | |
194 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
0e119b41 | 195 | unsigned int max; |
17926a79 DH |
196 | int ret; |
197 | ||
198 | _enter("%p,%d", rx, backlog); | |
199 | ||
200 | lock_sock(&rx->sk); | |
201 | ||
202 | switch (rx->sk.sk_state) { | |
2341e077 | 203 | case RXRPC_UNBOUND: |
17926a79 DH |
204 | ret = -EADDRNOTAVAIL; |
205 | break; | |
17926a79 DH |
206 | case RXRPC_SERVER_BOUND: |
207 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
208 | max = READ_ONCE(rxrpc_max_backlog); |
209 | ret = -EINVAL; | |
210 | if (backlog == INT_MAX) | |
211 | backlog = max; | |
212 | else if (backlog < 0 || backlog > max) | |
213 | break; | |
17926a79 DH |
214 | sk->sk_max_ack_backlog = backlog; |
215 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
216 | ret = 0; | |
217 | break; | |
0e119b41 DH |
218 | default: |
219 | ret = -EBUSY; | |
220 | break; | |
17926a79 DH |
221 | } |
222 | ||
223 | release_sock(&rx->sk); | |
224 | _leave(" = %d", ret); | |
225 | return ret; | |
226 | } | |
227 | ||
651350d1 DH |
228 | /** |
229 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
230 | * @sock: The socket on which to make the call | |
2341e077 | 231 | * @srx: The address of the peer to contact |
651350d1 DH |
232 | * @key: The security context to use (defaults to socket setting) |
233 | * @user_call_ID: The ID to use | |
d001648e DH |
234 | * @gfp: The allocation constraints |
235 | * @notify_rx: Where to send notifications instead of socket queue | |
651350d1 DH |
236 | * |
237 | * Allow a kernel service to begin a call on the nominated socket. This just | |
238 | * sets up all the internal tracking structures and allocates connection and | |
239 | * call IDs as appropriate. The call to be used is returned. | |
240 | * | |
241 | * The default socket destination address and security may be overridden by | |
242 | * supplying @srx and @key. | |
243 | */ | |
244 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
245 | struct sockaddr_rxrpc *srx, | |
246 | struct key *key, | |
247 | unsigned long user_call_ID, | |
d001648e DH |
248 | gfp_t gfp, |
249 | rxrpc_notify_rx_t notify_rx) | |
651350d1 | 250 | { |
19ffa01c | 251 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
252 | struct rxrpc_call *call; |
253 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 254 | int ret; |
651350d1 DH |
255 | |
256 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
257 | ||
f4552c2d DH |
258 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
259 | if (ret < 0) | |
260 | return ERR_PTR(ret); | |
261 | ||
651350d1 DH |
262 | lock_sock(&rx->sk); |
263 | ||
19ffa01c DH |
264 | if (!key) |
265 | key = rx->key; | |
266 | if (key && !key->payload.data[0]) | |
267 | key = NULL; /* a no-security key */ | |
268 | ||
269 | memset(&cp, 0, sizeof(cp)); | |
270 | cp.local = rx->local; | |
271 | cp.key = key; | |
272 | cp.security_level = 0; | |
273 | cp.exclusive = false; | |
274 | cp.service_id = srx->srx_service; | |
aa390bbe | 275 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); |
d001648e DH |
276 | if (!IS_ERR(call)) |
277 | call->notify_rx = notify_rx; | |
19ffa01c | 278 | |
651350d1 DH |
279 | release_sock(&rx->sk); |
280 | _leave(" = %p", call); | |
281 | return call; | |
282 | } | |
651350d1 DH |
283 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
284 | ||
285 | /** | |
286 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
4de48af6 | 287 | * @sock: The socket the call is on |
651350d1 DH |
288 | * @call: The call to end |
289 | * | |
290 | * Allow a kernel service to end a call it was using. The call must be | |
291 | * complete before this is called (the call should be aborted if necessary). | |
292 | */ | |
4de48af6 | 293 | void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call) |
651350d1 DH |
294 | { |
295 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
4de48af6 | 296 | rxrpc_remove_user_ID(rxrpc_sk(sock->sk), call); |
d001648e | 297 | rxrpc_purge_queue(&call->knlrecv_queue); |
651350d1 DH |
298 | rxrpc_put_call(call); |
299 | } | |
651350d1 DH |
300 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
301 | ||
302 | /** | |
d001648e | 303 | * rxrpc_kernel_new_call_notification - Get notifications of new calls |
651350d1 | 304 | * @sock: The socket to intercept received messages on |
d001648e | 305 | * @notify_new_call: Function to be called when new calls appear |
651350d1 | 306 | * |
d001648e | 307 | * Allow a kernel service to be given notifications about new calls. |
651350d1 | 308 | */ |
d001648e DH |
309 | void rxrpc_kernel_new_call_notification( |
310 | struct socket *sock, | |
311 | rxrpc_notify_new_call_t notify_new_call) | |
651350d1 DH |
312 | { |
313 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
314 | ||
d001648e | 315 | rx->notify_new_call = notify_new_call; |
651350d1 | 316 | } |
d001648e | 317 | EXPORT_SYMBOL(rxrpc_kernel_new_call_notification); |
651350d1 | 318 | |
17926a79 DH |
319 | /* |
320 | * connect an RxRPC socket | |
321 | * - this just targets it at a specific destination; no actual connection | |
322 | * negotiation takes place | |
323 | */ | |
324 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
325 | int addr_len, int flags) | |
326 | { | |
2341e077 DH |
327 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
328 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
329 | int ret; |
330 | ||
331 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
332 | ||
333 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
334 | if (ret < 0) { | |
335 | _leave(" = %d [bad addr]", ret); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | lock_sock(&rx->sk); | |
340 | ||
2341e077 DH |
341 | ret = -EISCONN; |
342 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
343 | goto error; | |
344 | ||
17926a79 | 345 | switch (rx->sk.sk_state) { |
2341e077 DH |
346 | case RXRPC_UNBOUND: |
347 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
348 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
349 | case RXRPC_CLIENT_BOUND: |
350 | break; | |
17926a79 | 351 | default: |
2341e077 DH |
352 | ret = -EBUSY; |
353 | goto error; | |
17926a79 DH |
354 | } |
355 | ||
2341e077 DH |
356 | rx->connect_srx = *srx; |
357 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
358 | ret = 0; | |
17926a79 | 359 | |
2341e077 | 360 | error: |
17926a79 | 361 | release_sock(&rx->sk); |
2341e077 | 362 | return ret; |
17926a79 DH |
363 | } |
364 | ||
365 | /* | |
366 | * send a message through an RxRPC socket | |
367 | * - in a client this does a number of things: | |
368 | * - finds/sets up a connection for the security specified (if any) | |
369 | * - initiates a call (ID in control data) | |
370 | * - ends the request phase of a call (if MSG_MORE is not set) | |
371 | * - sends a call data packet | |
372 | * - may send an abort (abort code in control data) | |
373 | */ | |
1b784140 | 374 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 375 | { |
2341e077 | 376 | struct rxrpc_local *local; |
17926a79 DH |
377 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
378 | int ret; | |
379 | ||
380 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
381 | ||
382 | if (m->msg_flags & MSG_OOB) | |
383 | return -EOPNOTSUPP; | |
384 | ||
385 | if (m->msg_name) { | |
386 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
387 | if (ret < 0) { | |
388 | _leave(" = %d [bad addr]", ret); | |
389 | return ret; | |
390 | } | |
391 | } | |
392 | ||
17926a79 DH |
393 | lock_sock(&rx->sk); |
394 | ||
17926a79 | 395 | switch (rx->sk.sk_state) { |
2341e077 DH |
396 | case RXRPC_UNBOUND: |
397 | local = rxrpc_lookup_local(&rx->srx); | |
398 | if (IS_ERR(local)) { | |
399 | ret = PTR_ERR(local); | |
400 | goto error_unlock; | |
17926a79 | 401 | } |
2341e077 DH |
402 | |
403 | rx->local = local; | |
404 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
405 | /* Fall through */ | |
406 | ||
407 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 408 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
409 | if (!m->msg_name && |
410 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
411 | m->msg_name = &rx->connect_srx; | |
412 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 413 | } |
2341e077 DH |
414 | case RXRPC_SERVER_BOUND: |
415 | case RXRPC_SERVER_LISTENING: | |
416 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
417 | break; |
418 | default: | |
2341e077 | 419 | ret = -EINVAL; |
17926a79 DH |
420 | break; |
421 | } | |
422 | ||
2341e077 | 423 | error_unlock: |
17926a79 | 424 | release_sock(&rx->sk); |
17926a79 DH |
425 | _leave(" = %d", ret); |
426 | return ret; | |
427 | } | |
428 | ||
429 | /* | |
430 | * set RxRPC socket options | |
431 | */ | |
432 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 433 | char __user *optval, unsigned int optlen) |
17926a79 DH |
434 | { |
435 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 436 | unsigned int min_sec_level; |
17926a79 DH |
437 | int ret; |
438 | ||
439 | _enter(",%d,%d,,%d", level, optname, optlen); | |
440 | ||
441 | lock_sock(&rx->sk); | |
442 | ret = -EOPNOTSUPP; | |
443 | ||
444 | if (level == SOL_RXRPC) { | |
445 | switch (optname) { | |
446 | case RXRPC_EXCLUSIVE_CONNECTION: | |
447 | ret = -EINVAL; | |
448 | if (optlen != 0) | |
449 | goto error; | |
450 | ret = -EISCONN; | |
2341e077 | 451 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 452 | goto error; |
cc8feb8e | 453 | rx->exclusive = true; |
17926a79 DH |
454 | goto success; |
455 | ||
456 | case RXRPC_SECURITY_KEY: | |
457 | ret = -EINVAL; | |
458 | if (rx->key) | |
459 | goto error; | |
460 | ret = -EISCONN; | |
2341e077 | 461 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
462 | goto error; |
463 | ret = rxrpc_request_key(rx, optval, optlen); | |
464 | goto error; | |
465 | ||
466 | case RXRPC_SECURITY_KEYRING: | |
467 | ret = -EINVAL; | |
468 | if (rx->key) | |
469 | goto error; | |
470 | ret = -EISCONN; | |
2341e077 | 471 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
472 | goto error; |
473 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
474 | goto error; | |
475 | ||
476 | case RXRPC_MIN_SECURITY_LEVEL: | |
477 | ret = -EINVAL; | |
95c96174 | 478 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
479 | goto error; |
480 | ret = -EISCONN; | |
2341e077 | 481 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
482 | goto error; |
483 | ret = get_user(min_sec_level, | |
95c96174 | 484 | (unsigned int __user *) optval); |
17926a79 DH |
485 | if (ret < 0) |
486 | goto error; | |
487 | ret = -EINVAL; | |
488 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
489 | goto error; | |
490 | rx->min_sec_level = min_sec_level; | |
491 | goto success; | |
492 | ||
493 | default: | |
494 | break; | |
495 | } | |
496 | } | |
497 | ||
498 | success: | |
499 | ret = 0; | |
500 | error: | |
501 | release_sock(&rx->sk); | |
502 | return ret; | |
503 | } | |
504 | ||
505 | /* | |
506 | * permit an RxRPC socket to be polled | |
507 | */ | |
508 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
509 | poll_table *wait) | |
510 | { | |
511 | unsigned int mask; | |
512 | struct sock *sk = sock->sk; | |
513 | ||
aa395145 | 514 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
515 | mask = 0; |
516 | ||
517 | /* the socket is readable if there are any messages waiting on the Rx | |
518 | * queue */ | |
519 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
520 | mask |= POLLIN | POLLRDNORM; | |
521 | ||
522 | /* the socket is writable if there is space to add new data to the | |
523 | * socket; there is no guarantee that any particular call in progress | |
524 | * on the socket may have space in the Tx ACK window */ | |
525 | if (rxrpc_writable(sk)) | |
526 | mask |= POLLOUT | POLLWRNORM; | |
527 | ||
528 | return mask; | |
529 | } | |
530 | ||
531 | /* | |
532 | * create an RxRPC socket | |
533 | */ | |
3f378b68 EP |
534 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
535 | int kern) | |
17926a79 DH |
536 | { |
537 | struct rxrpc_sock *rx; | |
538 | struct sock *sk; | |
539 | ||
540 | _enter("%p,%d", sock, protocol); | |
541 | ||
09ad9bc7 | 542 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
543 | return -EAFNOSUPPORT; |
544 | ||
b4f1342f | 545 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
546 | if (protocol != PF_INET) |
547 | return -EPROTONOSUPPORT; | |
548 | ||
549 | if (sock->type != SOCK_DGRAM) | |
550 | return -ESOCKTNOSUPPORT; | |
551 | ||
552 | sock->ops = &rxrpc_rpc_ops; | |
553 | sock->state = SS_UNCONNECTED; | |
554 | ||
11aa9c28 | 555 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
556 | if (!sk) |
557 | return -ENOMEM; | |
558 | ||
559 | sock_init_data(sock, sk); | |
2341e077 | 560 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 561 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 562 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
563 | sk->sk_destruct = rxrpc_sock_destructor; |
564 | ||
565 | rx = rxrpc_sk(sk); | |
19ffa01c | 566 | rx->family = protocol; |
17926a79 DH |
567 | rx->calls = RB_ROOT; |
568 | ||
569 | INIT_LIST_HEAD(&rx->listen_link); | |
570 | INIT_LIST_HEAD(&rx->secureq); | |
571 | INIT_LIST_HEAD(&rx->acceptq); | |
572 | rwlock_init(&rx->call_lock); | |
573 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
574 | ||
575 | _leave(" = 0 [%p]", rx); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* | |
580 | * RxRPC socket destructor | |
581 | */ | |
582 | static void rxrpc_sock_destructor(struct sock *sk) | |
583 | { | |
584 | _enter("%p", sk); | |
585 | ||
586 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
587 | ||
547b792c IJ |
588 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
589 | WARN_ON(!sk_unhashed(sk)); | |
590 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
591 | |
592 | if (!sock_flag(sk, SOCK_DEAD)) { | |
593 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
594 | return; | |
595 | } | |
596 | } | |
597 | ||
598 | /* | |
599 | * release an RxRPC socket | |
600 | */ | |
601 | static int rxrpc_release_sock(struct sock *sk) | |
602 | { | |
603 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
604 | ||
605 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
606 | ||
607 | /* declare the socket closed for business */ | |
608 | sock_orphan(sk); | |
609 | sk->sk_shutdown = SHUTDOWN_MASK; | |
610 | ||
611 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
612 | sk->sk_state = RXRPC_CLOSE; | |
613 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
614 | ||
615 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
616 | ||
617 | if (!list_empty(&rx->listen_link)) { | |
618 | write_lock_bh(&rx->local->services_lock); | |
619 | list_del(&rx->listen_link); | |
620 | write_unlock_bh(&rx->local->services_lock); | |
621 | } | |
622 | ||
623 | /* try to flush out this socket */ | |
624 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 625 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
626 | rxrpc_purge_queue(&sk->sk_receive_queue); |
627 | ||
5627cc8b DH |
628 | rxrpc_put_local(rx->local); |
629 | rx->local = NULL; | |
17926a79 DH |
630 | key_put(rx->key); |
631 | rx->key = NULL; | |
632 | key_put(rx->securities); | |
633 | rx->securities = NULL; | |
634 | sock_put(sk); | |
635 | ||
636 | _leave(" = 0"); | |
637 | return 0; | |
638 | } | |
639 | ||
640 | /* | |
641 | * release an RxRPC BSD socket on close() or equivalent | |
642 | */ | |
643 | static int rxrpc_release(struct socket *sock) | |
644 | { | |
645 | struct sock *sk = sock->sk; | |
646 | ||
647 | _enter("%p{%p}", sock, sk); | |
648 | ||
649 | if (!sk) | |
650 | return 0; | |
651 | ||
652 | sock->sk = NULL; | |
653 | ||
654 | return rxrpc_release_sock(sk); | |
655 | } | |
656 | ||
657 | /* | |
658 | * RxRPC network protocol | |
659 | */ | |
660 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 661 | .family = PF_RXRPC, |
17926a79 DH |
662 | .owner = THIS_MODULE, |
663 | .release = rxrpc_release, | |
664 | .bind = rxrpc_bind, | |
665 | .connect = rxrpc_connect, | |
666 | .socketpair = sock_no_socketpair, | |
667 | .accept = sock_no_accept, | |
668 | .getname = sock_no_getname, | |
669 | .poll = rxrpc_poll, | |
670 | .ioctl = sock_no_ioctl, | |
671 | .listen = rxrpc_listen, | |
672 | .shutdown = sock_no_shutdown, | |
673 | .setsockopt = rxrpc_setsockopt, | |
674 | .getsockopt = sock_no_getsockopt, | |
675 | .sendmsg = rxrpc_sendmsg, | |
676 | .recvmsg = rxrpc_recvmsg, | |
677 | .mmap = sock_no_mmap, | |
678 | .sendpage = sock_no_sendpage, | |
679 | }; | |
680 | ||
681 | static struct proto rxrpc_proto = { | |
682 | .name = "RXRPC", | |
683 | .owner = THIS_MODULE, | |
684 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 685 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
686 | }; |
687 | ||
ec1b4cf7 | 688 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
689 | .family = PF_RXRPC, |
690 | .create = rxrpc_create, | |
691 | .owner = THIS_MODULE, | |
692 | }; | |
693 | ||
694 | /* | |
695 | * initialise and register the RxRPC protocol | |
696 | */ | |
697 | static int __init af_rxrpc_init(void) | |
698 | { | |
17926a79 DH |
699 | int ret = -1; |
700 | ||
ce6654cf | 701 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 702 | |
0d12f8a4 | 703 | rxrpc_epoch = get_seconds(); |
17926a79 | 704 | |
651350d1 | 705 | ret = -ENOMEM; |
17926a79 DH |
706 | rxrpc_call_jar = kmem_cache_create( |
707 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 708 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 709 | if (!rxrpc_call_jar) { |
9b6d5398 | 710 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
711 | goto error_call_jar; |
712 | } | |
713 | ||
e1fcc7e2 | 714 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 715 | if (!rxrpc_workqueue) { |
9b6d5398 | 716 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
717 | goto error_work_queue; |
718 | } | |
719 | ||
648af7fc DH |
720 | ret = rxrpc_init_security(); |
721 | if (ret < 0) { | |
9b6d5398 | 722 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
723 | goto error_security; |
724 | } | |
725 | ||
17926a79 | 726 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 727 | if (ret < 0) { |
9b6d5398 | 728 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
729 | goto error_proto; |
730 | } | |
731 | ||
732 | ret = sock_register(&rxrpc_family_ops); | |
733 | if (ret < 0) { | |
9b6d5398 | 734 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
735 | goto error_sock; |
736 | } | |
737 | ||
738 | ret = register_key_type(&key_type_rxrpc); | |
739 | if (ret < 0) { | |
9b6d5398 | 740 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
741 | goto error_key_type; |
742 | } | |
743 | ||
744 | ret = register_key_type(&key_type_rxrpc_s); | |
745 | if (ret < 0) { | |
9b6d5398 | 746 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
747 | goto error_key_type_s; |
748 | } | |
749 | ||
5873c083 DH |
750 | ret = rxrpc_sysctl_init(); |
751 | if (ret < 0) { | |
9b6d5398 | 752 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
753 | goto error_sysctls; |
754 | } | |
755 | ||
17926a79 | 756 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
757 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
758 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
759 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
760 | #endif |
761 | return 0; | |
762 | ||
5873c083 DH |
763 | error_sysctls: |
764 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
765 | error_key_type_s: |
766 | unregister_key_type(&key_type_rxrpc); | |
767 | error_key_type: | |
768 | sock_unregister(PF_RXRPC); | |
769 | error_sock: | |
770 | proto_unregister(&rxrpc_proto); | |
771 | error_proto: | |
648af7fc | 772 | rxrpc_exit_security(); |
8addc044 WY |
773 | error_security: |
774 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 775 | error_work_queue: |
17926a79 DH |
776 | kmem_cache_destroy(rxrpc_call_jar); |
777 | error_call_jar: | |
778 | return ret; | |
779 | } | |
780 | ||
781 | /* | |
782 | * unregister the RxRPC protocol | |
783 | */ | |
784 | static void __exit af_rxrpc_exit(void) | |
785 | { | |
786 | _enter(""); | |
5873c083 | 787 | rxrpc_sysctl_exit(); |
17926a79 DH |
788 | unregister_key_type(&key_type_rxrpc_s); |
789 | unregister_key_type(&key_type_rxrpc); | |
790 | sock_unregister(PF_RXRPC); | |
791 | proto_unregister(&rxrpc_proto); | |
792 | rxrpc_destroy_all_calls(); | |
793 | rxrpc_destroy_all_connections(); | |
17926a79 | 794 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); |
4f95dd78 DH |
795 | rxrpc_destroy_all_locals(); |
796 | ||
ece31ffd G |
797 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
798 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 799 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 800 | rxrpc_exit_security(); |
17926a79 DH |
801 | kmem_cache_destroy(rxrpc_call_jar); |
802 | _leave(""); | |
803 | } | |
804 | ||
805 | module_init(af_rxrpc_init); | |
806 | module_exit(af_rxrpc_exit); |