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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 | 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 | ||
41 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 42 | u32 rxrpc_epoch; |
17926a79 DH |
43 | |
44 | /* current debugging ID */ | |
45 | atomic_t rxrpc_debug_id; | |
46 | ||
47 | /* count of skbs currently in use */ | |
71f3ca40 | 48 | atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs; |
17926a79 | 49 | |
651350d1 DH |
50 | struct workqueue_struct *rxrpc_workqueue; |
51 | ||
17926a79 DH |
52 | static void rxrpc_sock_destructor(struct sock *); |
53 | ||
54 | /* | |
55 | * see if an RxRPC socket is currently writable | |
56 | */ | |
57 | static inline int rxrpc_writable(struct sock *sk) | |
58 | { | |
59 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
60 | } | |
61 | ||
62 | /* | |
63 | * wait for write bufferage to become available | |
64 | */ | |
65 | static void rxrpc_write_space(struct sock *sk) | |
66 | { | |
67 | _enter("%p", sk); | |
43815482 | 68 | rcu_read_lock(); |
17926a79 | 69 | if (rxrpc_writable(sk)) { |
43815482 ED |
70 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
71 | ||
1ce0bf50 | 72 | if (skwq_has_sleeper(wq)) |
43815482 | 73 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 74 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 75 | } |
43815482 | 76 | rcu_read_unlock(); |
17926a79 DH |
77 | } |
78 | ||
79 | /* | |
80 | * validate an RxRPC address | |
81 | */ | |
82 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
83 | struct sockaddr_rxrpc *srx, | |
84 | int len) | |
85 | { | |
dad8aff7 | 86 | unsigned int tail; |
ab802ee0 | 87 | |
17926a79 DH |
88 | if (len < sizeof(struct sockaddr_rxrpc)) |
89 | return -EINVAL; | |
90 | ||
91 | if (srx->srx_family != AF_RXRPC) | |
92 | return -EAFNOSUPPORT; | |
93 | ||
94 | if (srx->transport_type != SOCK_DGRAM) | |
95 | return -ESOCKTNOSUPPORT; | |
96 | ||
97 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
98 | if (srx->transport_len < sizeof(sa_family_t) || | |
99 | srx->transport_len > len) | |
100 | return -EINVAL; | |
101 | ||
19ffa01c | 102 | if (srx->transport.family != rx->family) |
17926a79 DH |
103 | return -EAFNOSUPPORT; |
104 | ||
105 | switch (srx->transport.family) { | |
106 | case AF_INET: | |
4f95dd78 DH |
107 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
108 | return -EINVAL; | |
ab802ee0 | 109 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
110 | break; |
111 | ||
d1912747 | 112 | #ifdef CONFIG_AF_RXRPC_IPV6 |
17926a79 | 113 | case AF_INET6: |
75b54cb5 DH |
114 | if (srx->transport_len < sizeof(struct sockaddr_in6)) |
115 | return -EINVAL; | |
116 | tail = offsetof(struct sockaddr_rxrpc, transport) + | |
117 | sizeof(struct sockaddr_in6); | |
118 | break; | |
d1912747 | 119 | #endif |
75b54cb5 | 120 | |
17926a79 DH |
121 | default: |
122 | return -EAFNOSUPPORT; | |
123 | } | |
124 | ||
ab802ee0 DH |
125 | if (tail < len) |
126 | memset((void *)srx + tail, 0, len - tail); | |
75b54cb5 | 127 | _debug("INET: %pISp", &srx->transport); |
17926a79 DH |
128 | return 0; |
129 | } | |
130 | ||
131 | /* | |
132 | * bind a local address to an RxRPC socket | |
133 | */ | |
134 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
135 | { | |
b4f1342f | 136 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
137 | struct sock *sk = sock->sk; |
138 | struct rxrpc_local *local; | |
1e9e5c95 DH |
139 | struct rxrpc_sock *rx = rxrpc_sk(sk); |
140 | u16 service_id = srx->srx_service; | |
17926a79 DH |
141 | int ret; |
142 | ||
143 | _enter("%p,%p,%d", rx, saddr, len); | |
144 | ||
145 | ret = rxrpc_validate_address(rx, srx, len); | |
146 | if (ret < 0) | |
147 | goto error; | |
148 | ||
149 | lock_sock(&rx->sk); | |
150 | ||
2341e077 | 151 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
152 | ret = -EINVAL; |
153 | goto error_unlock; | |
154 | } | |
155 | ||
156 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
157 | ||
17926a79 DH |
158 | local = rxrpc_lookup_local(&rx->srx); |
159 | if (IS_ERR(local)) { | |
160 | ret = PTR_ERR(local); | |
161 | goto error_unlock; | |
162 | } | |
163 | ||
1e9e5c95 | 164 | if (service_id) { |
248f219c | 165 | write_lock(&local->services_lock); |
1e9e5c95 DH |
166 | if (rcu_access_pointer(local->service)) |
167 | goto service_in_use; | |
2341e077 | 168 | rx->local = local; |
1e9e5c95 | 169 | rcu_assign_pointer(local->service, rx); |
248f219c | 170 | write_unlock(&local->services_lock); |
17926a79 DH |
171 | |
172 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
173 | } else { | |
2341e077 | 174 | rx->local = local; |
17926a79 DH |
175 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
176 | } | |
177 | ||
178 | release_sock(&rx->sk); | |
179 | _leave(" = 0"); | |
180 | return 0; | |
181 | ||
182 | service_in_use: | |
248f219c | 183 | write_unlock(&local->services_lock); |
2341e077 DH |
184 | rxrpc_put_local(local); |
185 | ret = -EADDRINUSE; | |
17926a79 DH |
186 | error_unlock: |
187 | release_sock(&rx->sk); | |
188 | error: | |
189 | _leave(" = %d", ret); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | /* | |
194 | * set the number of pending calls permitted on a listening socket | |
195 | */ | |
196 | static int rxrpc_listen(struct socket *sock, int backlog) | |
197 | { | |
198 | struct sock *sk = sock->sk; | |
199 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
00e90712 | 200 | unsigned int max, old; |
17926a79 DH |
201 | int ret; |
202 | ||
203 | _enter("%p,%d", rx, backlog); | |
204 | ||
205 | lock_sock(&rx->sk); | |
206 | ||
207 | switch (rx->sk.sk_state) { | |
2341e077 | 208 | case RXRPC_UNBOUND: |
17926a79 DH |
209 | ret = -EADDRNOTAVAIL; |
210 | break; | |
17926a79 DH |
211 | case RXRPC_SERVER_BOUND: |
212 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
213 | max = READ_ONCE(rxrpc_max_backlog); |
214 | ret = -EINVAL; | |
215 | if (backlog == INT_MAX) | |
216 | backlog = max; | |
217 | else if (backlog < 0 || backlog > max) | |
218 | break; | |
00e90712 | 219 | old = sk->sk_max_ack_backlog; |
17926a79 | 220 | sk->sk_max_ack_backlog = backlog; |
00e90712 DH |
221 | ret = rxrpc_service_prealloc(rx, GFP_KERNEL); |
222 | if (ret == 0) | |
223 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
224 | else | |
225 | sk->sk_max_ack_backlog = old; | |
17926a79 | 226 | break; |
210f0353 DH |
227 | case RXRPC_SERVER_LISTENING: |
228 | if (backlog == 0) { | |
229 | rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED; | |
230 | sk->sk_max_ack_backlog = 0; | |
231 | rxrpc_discard_prealloc(rx); | |
232 | ret = 0; | |
233 | break; | |
234 | } | |
0e119b41 DH |
235 | default: |
236 | ret = -EBUSY; | |
237 | break; | |
17926a79 DH |
238 | } |
239 | ||
240 | release_sock(&rx->sk); | |
241 | _leave(" = %d", ret); | |
242 | return ret; | |
243 | } | |
244 | ||
651350d1 DH |
245 | /** |
246 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
247 | * @sock: The socket on which to make the call | |
2341e077 | 248 | * @srx: The address of the peer to contact |
651350d1 DH |
249 | * @key: The security context to use (defaults to socket setting) |
250 | * @user_call_ID: The ID to use | |
d001648e DH |
251 | * @gfp: The allocation constraints |
252 | * @notify_rx: Where to send notifications instead of socket queue | |
651350d1 DH |
253 | * |
254 | * Allow a kernel service to begin a call on the nominated socket. This just | |
255 | * sets up all the internal tracking structures and allocates connection and | |
256 | * call IDs as appropriate. The call to be used is returned. | |
257 | * | |
258 | * The default socket destination address and security may be overridden by | |
259 | * supplying @srx and @key. | |
260 | */ | |
261 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
262 | struct sockaddr_rxrpc *srx, | |
263 | struct key *key, | |
264 | unsigned long user_call_ID, | |
d001648e DH |
265 | gfp_t gfp, |
266 | rxrpc_notify_rx_t notify_rx) | |
651350d1 | 267 | { |
19ffa01c | 268 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
269 | struct rxrpc_call *call; |
270 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 271 | int ret; |
651350d1 DH |
272 | |
273 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
274 | ||
f4552c2d DH |
275 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
276 | if (ret < 0) | |
277 | return ERR_PTR(ret); | |
278 | ||
651350d1 DH |
279 | lock_sock(&rx->sk); |
280 | ||
19ffa01c DH |
281 | if (!key) |
282 | key = rx->key; | |
283 | if (key && !key->payload.data[0]) | |
284 | key = NULL; /* a no-security key */ | |
285 | ||
286 | memset(&cp, 0, sizeof(cp)); | |
287 | cp.local = rx->local; | |
288 | cp.key = key; | |
289 | cp.security_level = 0; | |
290 | cp.exclusive = false; | |
291 | cp.service_id = srx->srx_service; | |
aa390bbe | 292 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); |
540b1c48 | 293 | /* The socket has been unlocked. */ |
d001648e DH |
294 | if (!IS_ERR(call)) |
295 | call->notify_rx = notify_rx; | |
19ffa01c | 296 | |
540b1c48 | 297 | mutex_unlock(&call->user_mutex); |
651350d1 DH |
298 | _leave(" = %p", call); |
299 | return call; | |
300 | } | |
651350d1 DH |
301 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
302 | ||
303 | /** | |
304 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
4de48af6 | 305 | * @sock: The socket the call is on |
651350d1 DH |
306 | * @call: The call to end |
307 | * | |
308 | * Allow a kernel service to end a call it was using. The call must be | |
309 | * complete before this is called (the call should be aborted if necessary). | |
310 | */ | |
4de48af6 | 311 | void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call) |
651350d1 DH |
312 | { |
313 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
540b1c48 DH |
314 | |
315 | mutex_lock(&call->user_mutex); | |
8d94aa38 | 316 | rxrpc_release_call(rxrpc_sk(sock->sk), call); |
540b1c48 | 317 | mutex_unlock(&call->user_mutex); |
cbd00891 | 318 | rxrpc_put_call(call, rxrpc_call_put_kernel); |
651350d1 | 319 | } |
651350d1 DH |
320 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
321 | ||
322 | /** | |
d001648e | 323 | * rxrpc_kernel_new_call_notification - Get notifications of new calls |
651350d1 | 324 | * @sock: The socket to intercept received messages on |
d001648e | 325 | * @notify_new_call: Function to be called when new calls appear |
00e90712 | 326 | * @discard_new_call: Function to discard preallocated calls |
651350d1 | 327 | * |
d001648e | 328 | * Allow a kernel service to be given notifications about new calls. |
651350d1 | 329 | */ |
d001648e DH |
330 | void rxrpc_kernel_new_call_notification( |
331 | struct socket *sock, | |
00e90712 DH |
332 | rxrpc_notify_new_call_t notify_new_call, |
333 | rxrpc_discard_new_call_t discard_new_call) | |
651350d1 DH |
334 | { |
335 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
336 | ||
d001648e | 337 | rx->notify_new_call = notify_new_call; |
00e90712 | 338 | rx->discard_new_call = discard_new_call; |
651350d1 | 339 | } |
d001648e | 340 | EXPORT_SYMBOL(rxrpc_kernel_new_call_notification); |
651350d1 | 341 | |
17926a79 DH |
342 | /* |
343 | * connect an RxRPC socket | |
344 | * - this just targets it at a specific destination; no actual connection | |
345 | * negotiation takes place | |
346 | */ | |
347 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
348 | int addr_len, int flags) | |
349 | { | |
2341e077 DH |
350 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
351 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
352 | int ret; |
353 | ||
354 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
355 | ||
356 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
357 | if (ret < 0) { | |
358 | _leave(" = %d [bad addr]", ret); | |
359 | return ret; | |
360 | } | |
361 | ||
362 | lock_sock(&rx->sk); | |
363 | ||
2341e077 DH |
364 | ret = -EISCONN; |
365 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
366 | goto error; | |
367 | ||
17926a79 | 368 | switch (rx->sk.sk_state) { |
2341e077 DH |
369 | case RXRPC_UNBOUND: |
370 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
371 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
372 | case RXRPC_CLIENT_BOUND: |
373 | break; | |
17926a79 | 374 | default: |
2341e077 DH |
375 | ret = -EBUSY; |
376 | goto error; | |
17926a79 DH |
377 | } |
378 | ||
2341e077 DH |
379 | rx->connect_srx = *srx; |
380 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
381 | ret = 0; | |
17926a79 | 382 | |
2341e077 | 383 | error: |
17926a79 | 384 | release_sock(&rx->sk); |
2341e077 | 385 | return ret; |
17926a79 DH |
386 | } |
387 | ||
388 | /* | |
389 | * send a message through an RxRPC socket | |
390 | * - in a client this does a number of things: | |
391 | * - finds/sets up a connection for the security specified (if any) | |
392 | * - initiates a call (ID in control data) | |
393 | * - ends the request phase of a call (if MSG_MORE is not set) | |
394 | * - sends a call data packet | |
395 | * - may send an abort (abort code in control data) | |
396 | */ | |
1b784140 | 397 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 398 | { |
2341e077 | 399 | struct rxrpc_local *local; |
17926a79 DH |
400 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
401 | int ret; | |
402 | ||
403 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
404 | ||
405 | if (m->msg_flags & MSG_OOB) | |
406 | return -EOPNOTSUPP; | |
407 | ||
408 | if (m->msg_name) { | |
409 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
410 | if (ret < 0) { | |
411 | _leave(" = %d [bad addr]", ret); | |
412 | return ret; | |
413 | } | |
414 | } | |
415 | ||
17926a79 DH |
416 | lock_sock(&rx->sk); |
417 | ||
17926a79 | 418 | switch (rx->sk.sk_state) { |
2341e077 | 419 | case RXRPC_UNBOUND: |
cd5892c7 DH |
420 | rx->srx.srx_family = AF_RXRPC; |
421 | rx->srx.srx_service = 0; | |
422 | rx->srx.transport_type = SOCK_DGRAM; | |
423 | rx->srx.transport.family = rx->family; | |
424 | switch (rx->family) { | |
425 | case AF_INET: | |
426 | rx->srx.transport_len = sizeof(struct sockaddr_in); | |
427 | break; | |
d1912747 | 428 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
429 | case AF_INET6: |
430 | rx->srx.transport_len = sizeof(struct sockaddr_in6); | |
431 | break; | |
d1912747 | 432 | #endif |
cd5892c7 DH |
433 | default: |
434 | ret = -EAFNOSUPPORT; | |
435 | goto error_unlock; | |
436 | } | |
2341e077 DH |
437 | local = rxrpc_lookup_local(&rx->srx); |
438 | if (IS_ERR(local)) { | |
439 | ret = PTR_ERR(local); | |
440 | goto error_unlock; | |
17926a79 | 441 | } |
2341e077 DH |
442 | |
443 | rx->local = local; | |
444 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
445 | /* Fall through */ | |
446 | ||
447 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 448 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
449 | if (!m->msg_name && |
450 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
451 | m->msg_name = &rx->connect_srx; | |
452 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 453 | } |
2341e077 DH |
454 | case RXRPC_SERVER_BOUND: |
455 | case RXRPC_SERVER_LISTENING: | |
456 | ret = rxrpc_do_sendmsg(rx, m, len); | |
540b1c48 DH |
457 | /* The socket has been unlocked */ |
458 | goto out; | |
17926a79 | 459 | default: |
2341e077 | 460 | ret = -EINVAL; |
540b1c48 | 461 | goto error_unlock; |
17926a79 DH |
462 | } |
463 | ||
2341e077 | 464 | error_unlock: |
17926a79 | 465 | release_sock(&rx->sk); |
540b1c48 | 466 | out: |
17926a79 DH |
467 | _leave(" = %d", ret); |
468 | return ret; | |
469 | } | |
470 | ||
471 | /* | |
472 | * set RxRPC socket options | |
473 | */ | |
474 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 475 | char __user *optval, unsigned int optlen) |
17926a79 DH |
476 | { |
477 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 478 | unsigned int min_sec_level; |
17926a79 DH |
479 | int ret; |
480 | ||
481 | _enter(",%d,%d,,%d", level, optname, optlen); | |
482 | ||
483 | lock_sock(&rx->sk); | |
484 | ret = -EOPNOTSUPP; | |
485 | ||
486 | if (level == SOL_RXRPC) { | |
487 | switch (optname) { | |
488 | case RXRPC_EXCLUSIVE_CONNECTION: | |
489 | ret = -EINVAL; | |
490 | if (optlen != 0) | |
491 | goto error; | |
492 | ret = -EISCONN; | |
2341e077 | 493 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 494 | goto error; |
cc8feb8e | 495 | rx->exclusive = true; |
17926a79 DH |
496 | goto success; |
497 | ||
498 | case RXRPC_SECURITY_KEY: | |
499 | ret = -EINVAL; | |
500 | if (rx->key) | |
501 | goto error; | |
502 | ret = -EISCONN; | |
2341e077 | 503 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
504 | goto error; |
505 | ret = rxrpc_request_key(rx, optval, optlen); | |
506 | goto error; | |
507 | ||
508 | case RXRPC_SECURITY_KEYRING: | |
509 | ret = -EINVAL; | |
510 | if (rx->key) | |
511 | goto error; | |
512 | ret = -EISCONN; | |
2341e077 | 513 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
514 | goto error; |
515 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
516 | goto error; | |
517 | ||
518 | case RXRPC_MIN_SECURITY_LEVEL: | |
519 | ret = -EINVAL; | |
95c96174 | 520 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
521 | goto error; |
522 | ret = -EISCONN; | |
2341e077 | 523 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
524 | goto error; |
525 | ret = get_user(min_sec_level, | |
95c96174 | 526 | (unsigned int __user *) optval); |
17926a79 DH |
527 | if (ret < 0) |
528 | goto error; | |
529 | ret = -EINVAL; | |
530 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
531 | goto error; | |
532 | rx->min_sec_level = min_sec_level; | |
533 | goto success; | |
534 | ||
535 | default: | |
536 | break; | |
537 | } | |
538 | } | |
539 | ||
540 | success: | |
541 | ret = 0; | |
542 | error: | |
543 | release_sock(&rx->sk); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | /* | |
548 | * permit an RxRPC socket to be polled | |
549 | */ | |
550 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
551 | poll_table *wait) | |
552 | { | |
17926a79 | 553 | struct sock *sk = sock->sk; |
248f219c DH |
554 | struct rxrpc_sock *rx = rxrpc_sk(sk); |
555 | unsigned int mask; | |
17926a79 | 556 | |
aa395145 | 557 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
558 | mask = 0; |
559 | ||
560 | /* the socket is readable if there are any messages waiting on the Rx | |
561 | * queue */ | |
248f219c | 562 | if (!list_empty(&rx->recvmsg_q)) |
17926a79 DH |
563 | mask |= POLLIN | POLLRDNORM; |
564 | ||
565 | /* the socket is writable if there is space to add new data to the | |
566 | * socket; there is no guarantee that any particular call in progress | |
567 | * on the socket may have space in the Tx ACK window */ | |
568 | if (rxrpc_writable(sk)) | |
569 | mask |= POLLOUT | POLLWRNORM; | |
570 | ||
571 | return mask; | |
572 | } | |
573 | ||
574 | /* | |
575 | * create an RxRPC socket | |
576 | */ | |
3f378b68 EP |
577 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
578 | int kern) | |
17926a79 DH |
579 | { |
580 | struct rxrpc_sock *rx; | |
581 | struct sock *sk; | |
582 | ||
583 | _enter("%p,%d", sock, protocol); | |
584 | ||
09ad9bc7 | 585 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
586 | return -EAFNOSUPPORT; |
587 | ||
b4f1342f | 588 | /* we support transport protocol UDP/UDP6 only */ |
d1912747 DH |
589 | if (protocol != PF_INET && |
590 | IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6) | |
17926a79 DH |
591 | return -EPROTONOSUPPORT; |
592 | ||
593 | if (sock->type != SOCK_DGRAM) | |
594 | return -ESOCKTNOSUPPORT; | |
595 | ||
596 | sock->ops = &rxrpc_rpc_ops; | |
597 | sock->state = SS_UNCONNECTED; | |
598 | ||
11aa9c28 | 599 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
600 | if (!sk) |
601 | return -ENOMEM; | |
602 | ||
603 | sock_init_data(sock, sk); | |
8d94aa38 | 604 | sock_set_flag(sk, SOCK_RCU_FREE); |
2341e077 | 605 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 606 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 607 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
608 | sk->sk_destruct = rxrpc_sock_destructor; |
609 | ||
610 | rx = rxrpc_sk(sk); | |
19ffa01c | 611 | rx->family = protocol; |
17926a79 DH |
612 | rx->calls = RB_ROOT; |
613 | ||
248f219c DH |
614 | spin_lock_init(&rx->incoming_lock); |
615 | INIT_LIST_HEAD(&rx->sock_calls); | |
616 | INIT_LIST_HEAD(&rx->to_be_accepted); | |
617 | INIT_LIST_HEAD(&rx->recvmsg_q); | |
618 | rwlock_init(&rx->recvmsg_lock); | |
17926a79 DH |
619 | rwlock_init(&rx->call_lock); |
620 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
621 | ||
622 | _leave(" = 0 [%p]", rx); | |
623 | return 0; | |
624 | } | |
625 | ||
248f219c DH |
626 | /* |
627 | * Kill all the calls on a socket and shut it down. | |
628 | */ | |
629 | static int rxrpc_shutdown(struct socket *sock, int flags) | |
630 | { | |
631 | struct sock *sk = sock->sk; | |
632 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
633 | int ret = 0; | |
634 | ||
635 | _enter("%p,%d", sk, flags); | |
636 | ||
637 | if (flags != SHUT_RDWR) | |
638 | return -EOPNOTSUPP; | |
639 | if (sk->sk_state == RXRPC_CLOSE) | |
640 | return -ESHUTDOWN; | |
641 | ||
642 | lock_sock(sk); | |
643 | ||
644 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
645 | if (sk->sk_state < RXRPC_CLOSE) { | |
646 | sk->sk_state = RXRPC_CLOSE; | |
647 | sk->sk_shutdown = SHUTDOWN_MASK; | |
648 | } else { | |
649 | ret = -ESHUTDOWN; | |
650 | } | |
651 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
652 | ||
653 | rxrpc_discard_prealloc(rx); | |
654 | ||
655 | release_sock(sk); | |
656 | return ret; | |
657 | } | |
658 | ||
17926a79 DH |
659 | /* |
660 | * RxRPC socket destructor | |
661 | */ | |
662 | static void rxrpc_sock_destructor(struct sock *sk) | |
663 | { | |
664 | _enter("%p", sk); | |
665 | ||
666 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
667 | ||
547b792c IJ |
668 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
669 | WARN_ON(!sk_unhashed(sk)); | |
670 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
671 | |
672 | if (!sock_flag(sk, SOCK_DEAD)) { | |
673 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
674 | return; | |
675 | } | |
676 | } | |
677 | ||
678 | /* | |
679 | * release an RxRPC socket | |
680 | */ | |
681 | static int rxrpc_release_sock(struct sock *sk) | |
682 | { | |
683 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
684 | ||
685 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
686 | ||
687 | /* declare the socket closed for business */ | |
688 | sock_orphan(sk); | |
689 | sk->sk_shutdown = SHUTDOWN_MASK; | |
690 | ||
691 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
692 | sk->sk_state = RXRPC_CLOSE; | |
693 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
694 | ||
b63452c1 | 695 | if (rx->local && rcu_access_pointer(rx->local->service) == rx) { |
248f219c | 696 | write_lock(&rx->local->services_lock); |
b63452c1 | 697 | rcu_assign_pointer(rx->local->service, NULL); |
248f219c | 698 | write_unlock(&rx->local->services_lock); |
17926a79 DH |
699 | } |
700 | ||
701 | /* try to flush out this socket */ | |
00e90712 | 702 | rxrpc_discard_prealloc(rx); |
17926a79 | 703 | rxrpc_release_calls_on_socket(rx); |
651350d1 | 704 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
705 | rxrpc_purge_queue(&sk->sk_receive_queue); |
706 | ||
5627cc8b DH |
707 | rxrpc_put_local(rx->local); |
708 | rx->local = NULL; | |
17926a79 DH |
709 | key_put(rx->key); |
710 | rx->key = NULL; | |
711 | key_put(rx->securities); | |
712 | rx->securities = NULL; | |
713 | sock_put(sk); | |
714 | ||
715 | _leave(" = 0"); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | /* | |
720 | * release an RxRPC BSD socket on close() or equivalent | |
721 | */ | |
722 | static int rxrpc_release(struct socket *sock) | |
723 | { | |
724 | struct sock *sk = sock->sk; | |
725 | ||
726 | _enter("%p{%p}", sock, sk); | |
727 | ||
728 | if (!sk) | |
729 | return 0; | |
730 | ||
731 | sock->sk = NULL; | |
732 | ||
733 | return rxrpc_release_sock(sk); | |
734 | } | |
735 | ||
736 | /* | |
737 | * RxRPC network protocol | |
738 | */ | |
739 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 740 | .family = PF_RXRPC, |
17926a79 DH |
741 | .owner = THIS_MODULE, |
742 | .release = rxrpc_release, | |
743 | .bind = rxrpc_bind, | |
744 | .connect = rxrpc_connect, | |
745 | .socketpair = sock_no_socketpair, | |
746 | .accept = sock_no_accept, | |
747 | .getname = sock_no_getname, | |
748 | .poll = rxrpc_poll, | |
749 | .ioctl = sock_no_ioctl, | |
750 | .listen = rxrpc_listen, | |
248f219c | 751 | .shutdown = rxrpc_shutdown, |
17926a79 DH |
752 | .setsockopt = rxrpc_setsockopt, |
753 | .getsockopt = sock_no_getsockopt, | |
754 | .sendmsg = rxrpc_sendmsg, | |
755 | .recvmsg = rxrpc_recvmsg, | |
756 | .mmap = sock_no_mmap, | |
757 | .sendpage = sock_no_sendpage, | |
758 | }; | |
759 | ||
760 | static struct proto rxrpc_proto = { | |
761 | .name = "RXRPC", | |
762 | .owner = THIS_MODULE, | |
763 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 764 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
765 | }; |
766 | ||
ec1b4cf7 | 767 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
768 | .family = PF_RXRPC, |
769 | .create = rxrpc_create, | |
770 | .owner = THIS_MODULE, | |
771 | }; | |
772 | ||
773 | /* | |
774 | * initialise and register the RxRPC protocol | |
775 | */ | |
776 | static int __init af_rxrpc_init(void) | |
777 | { | |
17926a79 | 778 | int ret = -1; |
44430612 | 779 | unsigned int tmp; |
17926a79 | 780 | |
ce6654cf | 781 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 782 | |
5f2d9c44 DH |
783 | get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch)); |
784 | rxrpc_epoch |= RXRPC_RANDOM_EPOCH; | |
44430612 MW |
785 | get_random_bytes(&tmp, sizeof(tmp)); |
786 | tmp &= 0x3fffffff; | |
787 | if (tmp == 0) | |
788 | tmp = 1; | |
789 | idr_set_cursor(&rxrpc_client_conn_ids, tmp); | |
17926a79 | 790 | |
651350d1 | 791 | ret = -ENOMEM; |
17926a79 DH |
792 | rxrpc_call_jar = kmem_cache_create( |
793 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 794 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 795 | if (!rxrpc_call_jar) { |
9b6d5398 | 796 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
797 | goto error_call_jar; |
798 | } | |
799 | ||
e1fcc7e2 | 800 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 801 | if (!rxrpc_workqueue) { |
9b6d5398 | 802 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
803 | goto error_work_queue; |
804 | } | |
805 | ||
648af7fc DH |
806 | ret = rxrpc_init_security(); |
807 | if (ret < 0) { | |
9b6d5398 | 808 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
809 | goto error_security; |
810 | } | |
811 | ||
17926a79 | 812 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 813 | if (ret < 0) { |
9b6d5398 | 814 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
815 | goto error_proto; |
816 | } | |
817 | ||
818 | ret = sock_register(&rxrpc_family_ops); | |
819 | if (ret < 0) { | |
9b6d5398 | 820 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
821 | goto error_sock; |
822 | } | |
823 | ||
824 | ret = register_key_type(&key_type_rxrpc); | |
825 | if (ret < 0) { | |
9b6d5398 | 826 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
827 | goto error_key_type; |
828 | } | |
829 | ||
830 | ret = register_key_type(&key_type_rxrpc_s); | |
831 | if (ret < 0) { | |
9b6d5398 | 832 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
833 | goto error_key_type_s; |
834 | } | |
835 | ||
5873c083 DH |
836 | ret = rxrpc_sysctl_init(); |
837 | if (ret < 0) { | |
9b6d5398 | 838 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
839 | goto error_sysctls; |
840 | } | |
841 | ||
17926a79 | 842 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
843 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
844 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
845 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
846 | #endif |
847 | return 0; | |
848 | ||
5873c083 DH |
849 | error_sysctls: |
850 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
851 | error_key_type_s: |
852 | unregister_key_type(&key_type_rxrpc); | |
853 | error_key_type: | |
854 | sock_unregister(PF_RXRPC); | |
855 | error_sock: | |
856 | proto_unregister(&rxrpc_proto); | |
857 | error_proto: | |
648af7fc | 858 | rxrpc_exit_security(); |
8addc044 WY |
859 | error_security: |
860 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 861 | error_work_queue: |
17926a79 DH |
862 | kmem_cache_destroy(rxrpc_call_jar); |
863 | error_call_jar: | |
864 | return ret; | |
865 | } | |
866 | ||
867 | /* | |
868 | * unregister the RxRPC protocol | |
869 | */ | |
870 | static void __exit af_rxrpc_exit(void) | |
871 | { | |
872 | _enter(""); | |
5873c083 | 873 | rxrpc_sysctl_exit(); |
17926a79 DH |
874 | unregister_key_type(&key_type_rxrpc_s); |
875 | unregister_key_type(&key_type_rxrpc); | |
876 | sock_unregister(PF_RXRPC); | |
877 | proto_unregister(&rxrpc_proto); | |
878 | rxrpc_destroy_all_calls(); | |
879 | rxrpc_destroy_all_connections(); | |
71f3ca40 DH |
880 | ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0); |
881 | ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0); | |
4f95dd78 DH |
882 | rxrpc_destroy_all_locals(); |
883 | ||
ece31ffd G |
884 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
885 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 886 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 887 | rxrpc_exit_security(); |
17926a79 DH |
888 | kmem_cache_destroy(rxrpc_call_jar); |
889 | _leave(""); | |
890 | } | |
891 | ||
892 | module_init(af_rxrpc_init); | |
893 | module_exit(af_rxrpc_exit); |