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 | 18 | #include <linux/skbuff.h> |
5f2d9c44 | 19 | #include <linux/random.h> |
17926a79 DH |
20 | #include <linux/poll.h> |
21 | #include <linux/proc_fs.h> | |
76181c13 | 22 | #include <linux/key-type.h> |
457c4cbc | 23 | #include <net/net_namespace.h> |
17926a79 DH |
24 | #include <net/sock.h> |
25 | #include <net/af_rxrpc.h> | |
df844fd4 | 26 | #define CREATE_TRACE_POINTS |
17926a79 DH |
27 | #include "ar-internal.h" |
28 | ||
29 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
30 | MODULE_AUTHOR("Red Hat, Inc."); | |
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
33 | ||
95c96174 | 34 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 35 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 36 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 | 37 | |
17926a79 DH |
38 | static struct proto rxrpc_proto; |
39 | static const struct proto_ops rxrpc_rpc_ops; | |
40 | ||
17926a79 DH |
41 | /* current debugging ID */ |
42 | atomic_t rxrpc_debug_id; | |
43 | ||
44 | /* count of skbs currently in use */ | |
71f3ca40 | 45 | atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs; |
17926a79 | 46 | |
651350d1 DH |
47 | struct workqueue_struct *rxrpc_workqueue; |
48 | ||
17926a79 DH |
49 | static void rxrpc_sock_destructor(struct sock *); |
50 | ||
51 | /* | |
52 | * see if an RxRPC socket is currently writable | |
53 | */ | |
54 | static inline int rxrpc_writable(struct sock *sk) | |
55 | { | |
14afee4b | 56 | return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; |
17926a79 DH |
57 | } |
58 | ||
59 | /* | |
60 | * wait for write bufferage to become available | |
61 | */ | |
62 | static void rxrpc_write_space(struct sock *sk) | |
63 | { | |
64 | _enter("%p", sk); | |
43815482 | 65 | rcu_read_lock(); |
17926a79 | 66 | if (rxrpc_writable(sk)) { |
43815482 ED |
67 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
68 | ||
1ce0bf50 | 69 | if (skwq_has_sleeper(wq)) |
43815482 | 70 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 71 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 72 | } |
43815482 | 73 | rcu_read_unlock(); |
17926a79 DH |
74 | } |
75 | ||
76 | /* | |
77 | * validate an RxRPC address | |
78 | */ | |
79 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
80 | struct sockaddr_rxrpc *srx, | |
81 | int len) | |
82 | { | |
dad8aff7 | 83 | unsigned int tail; |
ab802ee0 | 84 | |
17926a79 DH |
85 | if (len < sizeof(struct sockaddr_rxrpc)) |
86 | return -EINVAL; | |
87 | ||
88 | if (srx->srx_family != AF_RXRPC) | |
89 | return -EAFNOSUPPORT; | |
90 | ||
91 | if (srx->transport_type != SOCK_DGRAM) | |
92 | return -ESOCKTNOSUPPORT; | |
93 | ||
94 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
95 | if (srx->transport_len < sizeof(sa_family_t) || | |
96 | srx->transport_len > len) | |
97 | return -EINVAL; | |
98 | ||
19ffa01c | 99 | if (srx->transport.family != rx->family) |
17926a79 DH |
100 | return -EAFNOSUPPORT; |
101 | ||
102 | switch (srx->transport.family) { | |
103 | case AF_INET: | |
4f95dd78 DH |
104 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
105 | return -EINVAL; | |
ab802ee0 | 106 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
107 | break; |
108 | ||
d1912747 | 109 | #ifdef CONFIG_AF_RXRPC_IPV6 |
17926a79 | 110 | case AF_INET6: |
75b54cb5 DH |
111 | if (srx->transport_len < sizeof(struct sockaddr_in6)) |
112 | return -EINVAL; | |
113 | tail = offsetof(struct sockaddr_rxrpc, transport) + | |
114 | sizeof(struct sockaddr_in6); | |
115 | break; | |
d1912747 | 116 | #endif |
75b54cb5 | 117 | |
17926a79 DH |
118 | default: |
119 | return -EAFNOSUPPORT; | |
120 | } | |
121 | ||
ab802ee0 DH |
122 | if (tail < len) |
123 | memset((void *)srx + tail, 0, len - tail); | |
75b54cb5 | 124 | _debug("INET: %pISp", &srx->transport); |
17926a79 DH |
125 | return 0; |
126 | } | |
127 | ||
128 | /* | |
129 | * bind a local address to an RxRPC socket | |
130 | */ | |
131 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
132 | { | |
b4f1342f | 133 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 | 134 | struct rxrpc_local *local; |
68d6d1ae | 135 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
1e9e5c95 | 136 | u16 service_id = srx->srx_service; |
17926a79 DH |
137 | int ret; |
138 | ||
139 | _enter("%p,%p,%d", rx, saddr, len); | |
140 | ||
141 | ret = rxrpc_validate_address(rx, srx, len); | |
142 | if (ret < 0) | |
143 | goto error; | |
144 | ||
145 | lock_sock(&rx->sk); | |
146 | ||
28036f44 DH |
147 | switch (rx->sk.sk_state) { |
148 | case RXRPC_UNBOUND: | |
149 | rx->srx = *srx; | |
150 | local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx); | |
151 | if (IS_ERR(local)) { | |
152 | ret = PTR_ERR(local); | |
153 | goto error_unlock; | |
154 | } | |
155 | ||
156 | if (service_id) { | |
157 | write_lock(&local->services_lock); | |
158 | if (rcu_access_pointer(local->service)) | |
159 | goto service_in_use; | |
160 | rx->local = local; | |
161 | rcu_assign_pointer(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; | |
17926a79 | 170 | |
28036f44 DH |
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(srx, &rx->srx, sizeof(*srx)) != 0) | |
181 | goto error_unlock; | |
182 | rx->second_service = service_id; | |
183 | rx->sk.sk_state = RXRPC_SERVER_BOUND2; | |
184 | break; | |
17926a79 | 185 | |
28036f44 DH |
186 | default: |
187 | ret = -EINVAL; | |
17926a79 DH |
188 | goto error_unlock; |
189 | } | |
190 | ||
17926a79 DH |
191 | release_sock(&rx->sk); |
192 | _leave(" = 0"); | |
193 | return 0; | |
194 | ||
195 | service_in_use: | |
248f219c | 196 | write_unlock(&local->services_lock); |
2341e077 DH |
197 | rxrpc_put_local(local); |
198 | ret = -EADDRINUSE; | |
17926a79 DH |
199 | error_unlock: |
200 | release_sock(&rx->sk); | |
201 | error: | |
202 | _leave(" = %d", ret); | |
203 | return ret; | |
204 | } | |
205 | ||
206 | /* | |
207 | * set the number of pending calls permitted on a listening socket | |
208 | */ | |
209 | static int rxrpc_listen(struct socket *sock, int backlog) | |
210 | { | |
211 | struct sock *sk = sock->sk; | |
212 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
00e90712 | 213 | unsigned int max, old; |
17926a79 DH |
214 | int ret; |
215 | ||
216 | _enter("%p,%d", rx, backlog); | |
217 | ||
218 | lock_sock(&rx->sk); | |
219 | ||
220 | switch (rx->sk.sk_state) { | |
2341e077 | 221 | case RXRPC_UNBOUND: |
17926a79 DH |
222 | ret = -EADDRNOTAVAIL; |
223 | break; | |
17926a79 | 224 | case RXRPC_SERVER_BOUND: |
28036f44 | 225 | case RXRPC_SERVER_BOUND2: |
17926a79 | 226 | ASSERT(rx->local != NULL); |
0e119b41 DH |
227 | max = READ_ONCE(rxrpc_max_backlog); |
228 | ret = -EINVAL; | |
229 | if (backlog == INT_MAX) | |
230 | backlog = max; | |
231 | else if (backlog < 0 || backlog > max) | |
232 | break; | |
00e90712 | 233 | old = sk->sk_max_ack_backlog; |
17926a79 | 234 | sk->sk_max_ack_backlog = backlog; |
00e90712 DH |
235 | ret = rxrpc_service_prealloc(rx, GFP_KERNEL); |
236 | if (ret == 0) | |
237 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
238 | else | |
239 | sk->sk_max_ack_backlog = old; | |
17926a79 | 240 | break; |
210f0353 DH |
241 | case RXRPC_SERVER_LISTENING: |
242 | if (backlog == 0) { | |
243 | rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED; | |
244 | sk->sk_max_ack_backlog = 0; | |
245 | rxrpc_discard_prealloc(rx); | |
246 | ret = 0; | |
247 | break; | |
248 | } | |
0e119b41 DH |
249 | default: |
250 | ret = -EBUSY; | |
251 | break; | |
17926a79 DH |
252 | } |
253 | ||
254 | release_sock(&rx->sk); | |
255 | _leave(" = %d", ret); | |
256 | return ret; | |
257 | } | |
258 | ||
651350d1 DH |
259 | /** |
260 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
261 | * @sock: The socket on which to make the call | |
2341e077 | 262 | * @srx: The address of the peer to contact |
651350d1 DH |
263 | * @key: The security context to use (defaults to socket setting) |
264 | * @user_call_ID: The ID to use | |
e754eba6 | 265 | * @tx_total_len: Total length of data to transmit during the call (or -1) |
d001648e DH |
266 | * @gfp: The allocation constraints |
267 | * @notify_rx: Where to send notifications instead of socket queue | |
651350d1 DH |
268 | * |
269 | * Allow a kernel service to begin a call on the nominated socket. This just | |
270 | * sets up all the internal tracking structures and allocates connection and | |
271 | * call IDs as appropriate. The call to be used is returned. | |
272 | * | |
273 | * The default socket destination address and security may be overridden by | |
274 | * supplying @srx and @key. | |
275 | */ | |
276 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
277 | struct sockaddr_rxrpc *srx, | |
278 | struct key *key, | |
279 | unsigned long user_call_ID, | |
e754eba6 | 280 | s64 tx_total_len, |
d001648e DH |
281 | gfp_t gfp, |
282 | rxrpc_notify_rx_t notify_rx) | |
651350d1 | 283 | { |
19ffa01c | 284 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
285 | struct rxrpc_call *call; |
286 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 287 | int ret; |
651350d1 DH |
288 | |
289 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
290 | ||
f4552c2d DH |
291 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
292 | if (ret < 0) | |
293 | return ERR_PTR(ret); | |
294 | ||
651350d1 DH |
295 | lock_sock(&rx->sk); |
296 | ||
19ffa01c DH |
297 | if (!key) |
298 | key = rx->key; | |
299 | if (key && !key->payload.data[0]) | |
300 | key = NULL; /* a no-security key */ | |
301 | ||
302 | memset(&cp, 0, sizeof(cp)); | |
303 | cp.local = rx->local; | |
304 | cp.key = key; | |
305 | cp.security_level = 0; | |
306 | cp.exclusive = false; | |
307 | cp.service_id = srx->srx_service; | |
e754eba6 DH |
308 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len, |
309 | gfp); | |
540b1c48 | 310 | /* The socket has been unlocked. */ |
d001648e DH |
311 | if (!IS_ERR(call)) |
312 | call->notify_rx = notify_rx; | |
19ffa01c | 313 | |
540b1c48 | 314 | mutex_unlock(&call->user_mutex); |
651350d1 DH |
315 | _leave(" = %p", call); |
316 | return call; | |
317 | } | |
651350d1 DH |
318 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
319 | ||
320 | /** | |
321 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
4de48af6 | 322 | * @sock: The socket the call is on |
651350d1 DH |
323 | * @call: The call to end |
324 | * | |
325 | * Allow a kernel service to end a call it was using. The call must be | |
326 | * complete before this is called (the call should be aborted if necessary). | |
327 | */ | |
4de48af6 | 328 | void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call) |
651350d1 DH |
329 | { |
330 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
540b1c48 DH |
331 | |
332 | mutex_lock(&call->user_mutex); | |
8d94aa38 | 333 | rxrpc_release_call(rxrpc_sk(sock->sk), call); |
540b1c48 | 334 | mutex_unlock(&call->user_mutex); |
cbd00891 | 335 | rxrpc_put_call(call, rxrpc_call_put_kernel); |
651350d1 | 336 | } |
651350d1 DH |
337 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
338 | ||
c038a58c DH |
339 | /** |
340 | * rxrpc_kernel_check_call - Check a call's state | |
341 | * @sock: The socket the call is on | |
342 | * @call: The call to check | |
343 | * @_compl: Where to store the completion state | |
344 | * @_abort_code: Where to store any abort code | |
345 | * | |
346 | * Allow a kernel service to query the state of a call and find out the manner | |
347 | * of its termination if it has completed. Returns -EINPROGRESS if the call is | |
348 | * still going, 0 if the call finished successfully, -ECONNABORTED if the call | |
349 | * was aborted and an appropriate error if the call failed in some other way. | |
350 | */ | |
351 | int rxrpc_kernel_check_call(struct socket *sock, struct rxrpc_call *call, | |
352 | enum rxrpc_call_completion *_compl, u32 *_abort_code) | |
353 | { | |
354 | if (call->state != RXRPC_CALL_COMPLETE) | |
355 | return -EINPROGRESS; | |
356 | smp_rmb(); | |
357 | *_compl = call->completion; | |
358 | *_abort_code = call->abort_code; | |
359 | return call->error; | |
360 | } | |
361 | EXPORT_SYMBOL(rxrpc_kernel_check_call); | |
362 | ||
363 | /** | |
364 | * rxrpc_kernel_retry_call - Allow a kernel service to retry a call | |
365 | * @sock: The socket the call is on | |
366 | * @call: The call to retry | |
367 | * @srx: The address of the peer to contact | |
368 | * @key: The security context to use (defaults to socket setting) | |
369 | * | |
370 | * Allow a kernel service to try resending a client call that failed due to a | |
371 | * network error to a new address. The Tx queue is maintained intact, thereby | |
372 | * relieving the need to re-encrypt any request data that has already been | |
373 | * buffered. | |
374 | */ | |
375 | int rxrpc_kernel_retry_call(struct socket *sock, struct rxrpc_call *call, | |
376 | struct sockaddr_rxrpc *srx, struct key *key) | |
377 | { | |
378 | struct rxrpc_conn_parameters cp; | |
379 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
380 | int ret; | |
381 | ||
382 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
383 | ||
384 | if (!key) | |
385 | key = rx->key; | |
386 | if (key && !key->payload.data[0]) | |
387 | key = NULL; /* a no-security key */ | |
388 | ||
389 | memset(&cp, 0, sizeof(cp)); | |
390 | cp.local = rx->local; | |
391 | cp.key = key; | |
392 | cp.security_level = 0; | |
393 | cp.exclusive = false; | |
394 | cp.service_id = srx->srx_service; | |
395 | ||
396 | mutex_lock(&call->user_mutex); | |
397 | ||
398 | ret = rxrpc_prepare_call_for_retry(rx, call); | |
399 | if (ret == 0) | |
400 | ret = rxrpc_retry_client_call(rx, call, &cp, srx, GFP_KERNEL); | |
401 | ||
402 | mutex_unlock(&call->user_mutex); | |
403 | _leave(" = %d", ret); | |
404 | return ret; | |
405 | } | |
406 | EXPORT_SYMBOL(rxrpc_kernel_retry_call); | |
407 | ||
651350d1 | 408 | /** |
d001648e | 409 | * rxrpc_kernel_new_call_notification - Get notifications of new calls |
651350d1 | 410 | * @sock: The socket to intercept received messages on |
d001648e | 411 | * @notify_new_call: Function to be called when new calls appear |
00e90712 | 412 | * @discard_new_call: Function to discard preallocated calls |
651350d1 | 413 | * |
d001648e | 414 | * Allow a kernel service to be given notifications about new calls. |
651350d1 | 415 | */ |
d001648e DH |
416 | void rxrpc_kernel_new_call_notification( |
417 | struct socket *sock, | |
00e90712 DH |
418 | rxrpc_notify_new_call_t notify_new_call, |
419 | rxrpc_discard_new_call_t discard_new_call) | |
651350d1 DH |
420 | { |
421 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
422 | ||
d001648e | 423 | rx->notify_new_call = notify_new_call; |
00e90712 | 424 | rx->discard_new_call = discard_new_call; |
651350d1 | 425 | } |
d001648e | 426 | EXPORT_SYMBOL(rxrpc_kernel_new_call_notification); |
651350d1 | 427 | |
17926a79 DH |
428 | /* |
429 | * connect an RxRPC socket | |
430 | * - this just targets it at a specific destination; no actual connection | |
431 | * negotiation takes place | |
432 | */ | |
433 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
434 | int addr_len, int flags) | |
435 | { | |
2341e077 DH |
436 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
437 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
438 | int ret; |
439 | ||
440 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
441 | ||
442 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
443 | if (ret < 0) { | |
444 | _leave(" = %d [bad addr]", ret); | |
445 | return ret; | |
446 | } | |
447 | ||
448 | lock_sock(&rx->sk); | |
449 | ||
2341e077 DH |
450 | ret = -EISCONN; |
451 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
452 | goto error; | |
453 | ||
17926a79 | 454 | switch (rx->sk.sk_state) { |
2341e077 DH |
455 | case RXRPC_UNBOUND: |
456 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
457 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
458 | case RXRPC_CLIENT_BOUND: |
459 | break; | |
17926a79 | 460 | default: |
2341e077 DH |
461 | ret = -EBUSY; |
462 | goto error; | |
17926a79 DH |
463 | } |
464 | ||
2341e077 DH |
465 | rx->connect_srx = *srx; |
466 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
467 | ret = 0; | |
17926a79 | 468 | |
2341e077 | 469 | error: |
17926a79 | 470 | release_sock(&rx->sk); |
2341e077 | 471 | return ret; |
17926a79 DH |
472 | } |
473 | ||
474 | /* | |
475 | * send a message through an RxRPC socket | |
476 | * - in a client this does a number of things: | |
477 | * - finds/sets up a connection for the security specified (if any) | |
478 | * - initiates a call (ID in control data) | |
479 | * - ends the request phase of a call (if MSG_MORE is not set) | |
480 | * - sends a call data packet | |
481 | * - may send an abort (abort code in control data) | |
482 | */ | |
1b784140 | 483 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 484 | { |
2341e077 | 485 | struct rxrpc_local *local; |
17926a79 DH |
486 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
487 | int ret; | |
488 | ||
489 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
490 | ||
491 | if (m->msg_flags & MSG_OOB) | |
492 | return -EOPNOTSUPP; | |
493 | ||
494 | if (m->msg_name) { | |
495 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
496 | if (ret < 0) { | |
497 | _leave(" = %d [bad addr]", ret); | |
498 | return ret; | |
499 | } | |
500 | } | |
501 | ||
17926a79 DH |
502 | lock_sock(&rx->sk); |
503 | ||
17926a79 | 504 | switch (rx->sk.sk_state) { |
2341e077 | 505 | case RXRPC_UNBOUND: |
cd5892c7 DH |
506 | rx->srx.srx_family = AF_RXRPC; |
507 | rx->srx.srx_service = 0; | |
508 | rx->srx.transport_type = SOCK_DGRAM; | |
509 | rx->srx.transport.family = rx->family; | |
510 | switch (rx->family) { | |
511 | case AF_INET: | |
512 | rx->srx.transport_len = sizeof(struct sockaddr_in); | |
513 | break; | |
d1912747 | 514 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
515 | case AF_INET6: |
516 | rx->srx.transport_len = sizeof(struct sockaddr_in6); | |
517 | break; | |
d1912747 | 518 | #endif |
cd5892c7 DH |
519 | default: |
520 | ret = -EAFNOSUPPORT; | |
521 | goto error_unlock; | |
522 | } | |
2baec2c3 | 523 | local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx); |
2341e077 DH |
524 | if (IS_ERR(local)) { |
525 | ret = PTR_ERR(local); | |
526 | goto error_unlock; | |
17926a79 | 527 | } |
2341e077 DH |
528 | |
529 | rx->local = local; | |
530 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
531 | /* Fall through */ | |
532 | ||
533 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 534 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
535 | if (!m->msg_name && |
536 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
537 | m->msg_name = &rx->connect_srx; | |
538 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 539 | } |
2341e077 DH |
540 | case RXRPC_SERVER_BOUND: |
541 | case RXRPC_SERVER_LISTENING: | |
542 | ret = rxrpc_do_sendmsg(rx, m, len); | |
540b1c48 DH |
543 | /* The socket has been unlocked */ |
544 | goto out; | |
17926a79 | 545 | default: |
2341e077 | 546 | ret = -EINVAL; |
540b1c48 | 547 | goto error_unlock; |
17926a79 DH |
548 | } |
549 | ||
2341e077 | 550 | error_unlock: |
17926a79 | 551 | release_sock(&rx->sk); |
540b1c48 | 552 | out: |
17926a79 DH |
553 | _leave(" = %d", ret); |
554 | return ret; | |
555 | } | |
556 | ||
557 | /* | |
558 | * set RxRPC socket options | |
559 | */ | |
560 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 561 | char __user *optval, unsigned int optlen) |
17926a79 DH |
562 | { |
563 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 564 | unsigned int min_sec_level; |
4722974d | 565 | u16 service_upgrade[2]; |
17926a79 DH |
566 | int ret; |
567 | ||
568 | _enter(",%d,%d,,%d", level, optname, optlen); | |
569 | ||
570 | lock_sock(&rx->sk); | |
571 | ret = -EOPNOTSUPP; | |
572 | ||
573 | if (level == SOL_RXRPC) { | |
574 | switch (optname) { | |
575 | case RXRPC_EXCLUSIVE_CONNECTION: | |
576 | ret = -EINVAL; | |
577 | if (optlen != 0) | |
578 | goto error; | |
579 | ret = -EISCONN; | |
2341e077 | 580 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 581 | goto error; |
cc8feb8e | 582 | rx->exclusive = true; |
17926a79 DH |
583 | goto success; |
584 | ||
585 | case RXRPC_SECURITY_KEY: | |
586 | ret = -EINVAL; | |
587 | if (rx->key) | |
588 | goto error; | |
589 | ret = -EISCONN; | |
2341e077 | 590 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
591 | goto error; |
592 | ret = rxrpc_request_key(rx, optval, optlen); | |
593 | goto error; | |
594 | ||
595 | case RXRPC_SECURITY_KEYRING: | |
596 | ret = -EINVAL; | |
597 | if (rx->key) | |
598 | goto error; | |
599 | ret = -EISCONN; | |
2341e077 | 600 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
601 | goto error; |
602 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
603 | goto error; | |
604 | ||
605 | case RXRPC_MIN_SECURITY_LEVEL: | |
606 | ret = -EINVAL; | |
95c96174 | 607 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
608 | goto error; |
609 | ret = -EISCONN; | |
2341e077 | 610 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
611 | goto error; |
612 | ret = get_user(min_sec_level, | |
95c96174 | 613 | (unsigned int __user *) optval); |
17926a79 DH |
614 | if (ret < 0) |
615 | goto error; | |
616 | ret = -EINVAL; | |
617 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
618 | goto error; | |
619 | rx->min_sec_level = min_sec_level; | |
620 | goto success; | |
621 | ||
4722974d DH |
622 | case RXRPC_UPGRADEABLE_SERVICE: |
623 | ret = -EINVAL; | |
624 | if (optlen != sizeof(service_upgrade) || | |
625 | rx->service_upgrade.from != 0) | |
626 | goto error; | |
627 | ret = -EISCONN; | |
628 | if (rx->sk.sk_state != RXRPC_SERVER_BOUND2) | |
629 | goto error; | |
630 | ret = -EFAULT; | |
631 | if (copy_from_user(service_upgrade, optval, | |
632 | sizeof(service_upgrade)) != 0) | |
633 | goto error; | |
634 | ret = -EINVAL; | |
635 | if ((service_upgrade[0] != rx->srx.srx_service || | |
636 | service_upgrade[1] != rx->second_service) && | |
637 | (service_upgrade[0] != rx->second_service || | |
638 | service_upgrade[1] != rx->srx.srx_service)) | |
639 | goto error; | |
640 | rx->service_upgrade.from = service_upgrade[0]; | |
641 | rx->service_upgrade.to = service_upgrade[1]; | |
642 | goto success; | |
643 | ||
17926a79 DH |
644 | default: |
645 | break; | |
646 | } | |
647 | } | |
648 | ||
649 | success: | |
650 | ret = 0; | |
651 | error: | |
652 | release_sock(&rx->sk); | |
653 | return ret; | |
654 | } | |
655 | ||
515559ca DH |
656 | /* |
657 | * Get socket options. | |
658 | */ | |
659 | static int rxrpc_getsockopt(struct socket *sock, int level, int optname, | |
660 | char __user *optval, int __user *_optlen) | |
661 | { | |
662 | int optlen; | |
3ec0efde | 663 | |
515559ca DH |
664 | if (level != SOL_RXRPC) |
665 | return -EOPNOTSUPP; | |
666 | ||
667 | if (get_user(optlen, _optlen)) | |
668 | return -EFAULT; | |
3ec0efde | 669 | |
515559ca DH |
670 | switch (optname) { |
671 | case RXRPC_SUPPORTED_CMSG: | |
672 | if (optlen < sizeof(int)) | |
673 | return -ETOOSMALL; | |
674 | if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) || | |
675 | put_user(sizeof(int), _optlen)) | |
676 | return -EFAULT; | |
677 | return 0; | |
3ec0efde | 678 | |
515559ca DH |
679 | default: |
680 | return -EOPNOTSUPP; | |
681 | } | |
682 | } | |
683 | ||
17926a79 DH |
684 | /* |
685 | * permit an RxRPC socket to be polled | |
686 | */ | |
687 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
688 | poll_table *wait) | |
689 | { | |
17926a79 | 690 | struct sock *sk = sock->sk; |
248f219c DH |
691 | struct rxrpc_sock *rx = rxrpc_sk(sk); |
692 | unsigned int mask; | |
17926a79 | 693 | |
aa395145 | 694 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
695 | mask = 0; |
696 | ||
697 | /* the socket is readable if there are any messages waiting on the Rx | |
698 | * queue */ | |
248f219c | 699 | if (!list_empty(&rx->recvmsg_q)) |
17926a79 DH |
700 | mask |= POLLIN | POLLRDNORM; |
701 | ||
702 | /* the socket is writable if there is space to add new data to the | |
703 | * socket; there is no guarantee that any particular call in progress | |
704 | * on the socket may have space in the Tx ACK window */ | |
705 | if (rxrpc_writable(sk)) | |
706 | mask |= POLLOUT | POLLWRNORM; | |
707 | ||
708 | return mask; | |
709 | } | |
710 | ||
711 | /* | |
712 | * create an RxRPC socket | |
713 | */ | |
3f378b68 EP |
714 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
715 | int kern) | |
17926a79 DH |
716 | { |
717 | struct rxrpc_sock *rx; | |
718 | struct sock *sk; | |
719 | ||
720 | _enter("%p,%d", sock, protocol); | |
721 | ||
b4f1342f | 722 | /* we support transport protocol UDP/UDP6 only */ |
d1912747 DH |
723 | if (protocol != PF_INET && |
724 | IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6) | |
17926a79 DH |
725 | return -EPROTONOSUPPORT; |
726 | ||
727 | if (sock->type != SOCK_DGRAM) | |
728 | return -ESOCKTNOSUPPORT; | |
729 | ||
730 | sock->ops = &rxrpc_rpc_ops; | |
731 | sock->state = SS_UNCONNECTED; | |
732 | ||
11aa9c28 | 733 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
734 | if (!sk) |
735 | return -ENOMEM; | |
736 | ||
737 | sock_init_data(sock, sk); | |
8d94aa38 | 738 | sock_set_flag(sk, SOCK_RCU_FREE); |
2341e077 | 739 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 740 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 741 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
742 | sk->sk_destruct = rxrpc_sock_destructor; |
743 | ||
744 | rx = rxrpc_sk(sk); | |
19ffa01c | 745 | rx->family = protocol; |
17926a79 DH |
746 | rx->calls = RB_ROOT; |
747 | ||
248f219c DH |
748 | spin_lock_init(&rx->incoming_lock); |
749 | INIT_LIST_HEAD(&rx->sock_calls); | |
750 | INIT_LIST_HEAD(&rx->to_be_accepted); | |
751 | INIT_LIST_HEAD(&rx->recvmsg_q); | |
752 | rwlock_init(&rx->recvmsg_lock); | |
17926a79 DH |
753 | rwlock_init(&rx->call_lock); |
754 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
755 | ||
756 | _leave(" = 0 [%p]", rx); | |
757 | return 0; | |
758 | } | |
759 | ||
248f219c DH |
760 | /* |
761 | * Kill all the calls on a socket and shut it down. | |
762 | */ | |
763 | static int rxrpc_shutdown(struct socket *sock, int flags) | |
764 | { | |
765 | struct sock *sk = sock->sk; | |
766 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
767 | int ret = 0; | |
768 | ||
769 | _enter("%p,%d", sk, flags); | |
770 | ||
771 | if (flags != SHUT_RDWR) | |
772 | return -EOPNOTSUPP; | |
773 | if (sk->sk_state == RXRPC_CLOSE) | |
774 | return -ESHUTDOWN; | |
775 | ||
776 | lock_sock(sk); | |
777 | ||
778 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
779 | if (sk->sk_state < RXRPC_CLOSE) { | |
780 | sk->sk_state = RXRPC_CLOSE; | |
781 | sk->sk_shutdown = SHUTDOWN_MASK; | |
782 | } else { | |
783 | ret = -ESHUTDOWN; | |
784 | } | |
785 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
786 | ||
787 | rxrpc_discard_prealloc(rx); | |
788 | ||
789 | release_sock(sk); | |
790 | return ret; | |
791 | } | |
792 | ||
17926a79 DH |
793 | /* |
794 | * RxRPC socket destructor | |
795 | */ | |
796 | static void rxrpc_sock_destructor(struct sock *sk) | |
797 | { | |
798 | _enter("%p", sk); | |
799 | ||
800 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
801 | ||
14afee4b | 802 | WARN_ON(refcount_read(&sk->sk_wmem_alloc)); |
547b792c IJ |
803 | WARN_ON(!sk_unhashed(sk)); |
804 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
805 | |
806 | if (!sock_flag(sk, SOCK_DEAD)) { | |
807 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
808 | return; | |
809 | } | |
810 | } | |
811 | ||
812 | /* | |
813 | * release an RxRPC socket | |
814 | */ | |
815 | static int rxrpc_release_sock(struct sock *sk) | |
816 | { | |
817 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
818 | ||
41c6d650 | 819 | _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt)); |
17926a79 DH |
820 | |
821 | /* declare the socket closed for business */ | |
822 | sock_orphan(sk); | |
823 | sk->sk_shutdown = SHUTDOWN_MASK; | |
824 | ||
825 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
826 | sk->sk_state = RXRPC_CLOSE; | |
827 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
828 | ||
b63452c1 | 829 | if (rx->local && rcu_access_pointer(rx->local->service) == rx) { |
248f219c | 830 | write_lock(&rx->local->services_lock); |
b63452c1 | 831 | rcu_assign_pointer(rx->local->service, NULL); |
248f219c | 832 | write_unlock(&rx->local->services_lock); |
17926a79 DH |
833 | } |
834 | ||
835 | /* try to flush out this socket */ | |
00e90712 | 836 | rxrpc_discard_prealloc(rx); |
17926a79 | 837 | rxrpc_release_calls_on_socket(rx); |
651350d1 | 838 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
839 | rxrpc_purge_queue(&sk->sk_receive_queue); |
840 | ||
5627cc8b DH |
841 | rxrpc_put_local(rx->local); |
842 | rx->local = NULL; | |
17926a79 DH |
843 | key_put(rx->key); |
844 | rx->key = NULL; | |
845 | key_put(rx->securities); | |
846 | rx->securities = NULL; | |
847 | sock_put(sk); | |
848 | ||
849 | _leave(" = 0"); | |
850 | return 0; | |
851 | } | |
852 | ||
853 | /* | |
854 | * release an RxRPC BSD socket on close() or equivalent | |
855 | */ | |
856 | static int rxrpc_release(struct socket *sock) | |
857 | { | |
858 | struct sock *sk = sock->sk; | |
859 | ||
860 | _enter("%p{%p}", sock, sk); | |
861 | ||
862 | if (!sk) | |
863 | return 0; | |
864 | ||
865 | sock->sk = NULL; | |
866 | ||
867 | return rxrpc_release_sock(sk); | |
868 | } | |
869 | ||
870 | /* | |
871 | * RxRPC network protocol | |
872 | */ | |
873 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 874 | .family = PF_RXRPC, |
17926a79 DH |
875 | .owner = THIS_MODULE, |
876 | .release = rxrpc_release, | |
877 | .bind = rxrpc_bind, | |
878 | .connect = rxrpc_connect, | |
879 | .socketpair = sock_no_socketpair, | |
880 | .accept = sock_no_accept, | |
881 | .getname = sock_no_getname, | |
882 | .poll = rxrpc_poll, | |
883 | .ioctl = sock_no_ioctl, | |
884 | .listen = rxrpc_listen, | |
248f219c | 885 | .shutdown = rxrpc_shutdown, |
17926a79 | 886 | .setsockopt = rxrpc_setsockopt, |
515559ca | 887 | .getsockopt = rxrpc_getsockopt, |
17926a79 DH |
888 | .sendmsg = rxrpc_sendmsg, |
889 | .recvmsg = rxrpc_recvmsg, | |
890 | .mmap = sock_no_mmap, | |
891 | .sendpage = sock_no_sendpage, | |
892 | }; | |
893 | ||
894 | static struct proto rxrpc_proto = { | |
895 | .name = "RXRPC", | |
896 | .owner = THIS_MODULE, | |
897 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 898 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
899 | }; |
900 | ||
ec1b4cf7 | 901 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
902 | .family = PF_RXRPC, |
903 | .create = rxrpc_create, | |
904 | .owner = THIS_MODULE, | |
905 | }; | |
906 | ||
907 | /* | |
908 | * initialise and register the RxRPC protocol | |
909 | */ | |
910 | static int __init af_rxrpc_init(void) | |
911 | { | |
17926a79 | 912 | int ret = -1; |
44430612 | 913 | unsigned int tmp; |
17926a79 | 914 | |
ce6654cf | 915 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 916 | |
44430612 MW |
917 | get_random_bytes(&tmp, sizeof(tmp)); |
918 | tmp &= 0x3fffffff; | |
919 | if (tmp == 0) | |
920 | tmp = 1; | |
921 | idr_set_cursor(&rxrpc_client_conn_ids, tmp); | |
17926a79 | 922 | |
651350d1 | 923 | ret = -ENOMEM; |
17926a79 DH |
924 | rxrpc_call_jar = kmem_cache_create( |
925 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 926 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 927 | if (!rxrpc_call_jar) { |
9b6d5398 | 928 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
929 | goto error_call_jar; |
930 | } | |
931 | ||
e1fcc7e2 | 932 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 933 | if (!rxrpc_workqueue) { |
9b6d5398 | 934 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
935 | goto error_work_queue; |
936 | } | |
937 | ||
648af7fc DH |
938 | ret = rxrpc_init_security(); |
939 | if (ret < 0) { | |
9b6d5398 | 940 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
941 | goto error_security; |
942 | } | |
943 | ||
2baec2c3 DH |
944 | ret = register_pernet_subsys(&rxrpc_net_ops); |
945 | if (ret) | |
946 | goto error_pernet; | |
947 | ||
17926a79 | 948 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 949 | if (ret < 0) { |
9b6d5398 | 950 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
951 | goto error_proto; |
952 | } | |
953 | ||
954 | ret = sock_register(&rxrpc_family_ops); | |
955 | if (ret < 0) { | |
9b6d5398 | 956 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
957 | goto error_sock; |
958 | } | |
959 | ||
960 | ret = register_key_type(&key_type_rxrpc); | |
961 | if (ret < 0) { | |
9b6d5398 | 962 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
963 | goto error_key_type; |
964 | } | |
965 | ||
966 | ret = register_key_type(&key_type_rxrpc_s); | |
967 | if (ret < 0) { | |
9b6d5398 | 968 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
969 | goto error_key_type_s; |
970 | } | |
971 | ||
5873c083 DH |
972 | ret = rxrpc_sysctl_init(); |
973 | if (ret < 0) { | |
9b6d5398 | 974 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
975 | goto error_sysctls; |
976 | } | |
977 | ||
17926a79 DH |
978 | return 0; |
979 | ||
5873c083 DH |
980 | error_sysctls: |
981 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
982 | error_key_type_s: |
983 | unregister_key_type(&key_type_rxrpc); | |
984 | error_key_type: | |
985 | sock_unregister(PF_RXRPC); | |
986 | error_sock: | |
987 | proto_unregister(&rxrpc_proto); | |
988 | error_proto: | |
2baec2c3 DH |
989 | unregister_pernet_subsys(&rxrpc_net_ops); |
990 | error_pernet: | |
648af7fc | 991 | rxrpc_exit_security(); |
8addc044 WY |
992 | error_security: |
993 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 994 | error_work_queue: |
17926a79 DH |
995 | kmem_cache_destroy(rxrpc_call_jar); |
996 | error_call_jar: | |
997 | return ret; | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * unregister the RxRPC protocol | |
1002 | */ | |
1003 | static void __exit af_rxrpc_exit(void) | |
1004 | { | |
1005 | _enter(""); | |
5873c083 | 1006 | rxrpc_sysctl_exit(); |
17926a79 DH |
1007 | unregister_key_type(&key_type_rxrpc_s); |
1008 | unregister_key_type(&key_type_rxrpc); | |
1009 | sock_unregister(PF_RXRPC); | |
1010 | proto_unregister(&rxrpc_proto); | |
2baec2c3 | 1011 | unregister_pernet_subsys(&rxrpc_net_ops); |
71f3ca40 DH |
1012 | ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0); |
1013 | ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0); | |
4f95dd78 | 1014 | |
2baec2c3 DH |
1015 | /* Make sure the local and peer records pinned by any dying connections |
1016 | * are released. | |
1017 | */ | |
1018 | rcu_barrier(); | |
1019 | rxrpc_destroy_client_conn_ids(); | |
1020 | ||
651350d1 | 1021 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 1022 | rxrpc_exit_security(); |
17926a79 DH |
1023 | kmem_cache_destroy(rxrpc_call_jar); |
1024 | _leave(""); | |
1025 | } | |
1026 | ||
1027 | module_init(af_rxrpc_init); | |
1028 | module_exit(af_rxrpc_exit); |