Commit | Line | Data |
---|---|---|
17926a79 DH |
1 | /* incoming call handling |
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 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/net.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/errqueue.h> | |
16 | #include <linux/udp.h> | |
17 | #include <linux/in.h> | |
18 | #include <linux/in6.h> | |
19 | #include <linux/icmp.h> | |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
17926a79 DH |
21 | #include <net/sock.h> |
22 | #include <net/af_rxrpc.h> | |
23 | #include <net/ip.h> | |
24 | #include "ar-internal.h" | |
25 | ||
26 | /* | |
27 | * generate a connection-level abort | |
28 | */ | |
29 | static int rxrpc_busy(struct rxrpc_local *local, struct sockaddr_rxrpc *srx, | |
0d12f8a4 | 30 | struct rxrpc_wire_header *whdr) |
17926a79 DH |
31 | { |
32 | struct msghdr msg; | |
33 | struct kvec iov[1]; | |
34 | size_t len; | |
35 | int ret; | |
36 | ||
37 | _enter("%d,,", local->debug_id); | |
38 | ||
0d12f8a4 DH |
39 | whdr->type = RXRPC_PACKET_TYPE_BUSY; |
40 | whdr->serial = htonl(1); | |
41 | ||
17926a79 DH |
42 | msg.msg_name = &srx->transport.sin; |
43 | msg.msg_namelen = sizeof(srx->transport.sin); | |
44 | msg.msg_control = NULL; | |
45 | msg.msg_controllen = 0; | |
46 | msg.msg_flags = 0; | |
47 | ||
0d12f8a4 DH |
48 | iov[0].iov_base = whdr; |
49 | iov[0].iov_len = sizeof(*whdr); | |
17926a79 DH |
50 | |
51 | len = iov[0].iov_len; | |
52 | ||
0d12f8a4 | 53 | _proto("Tx BUSY %%1"); |
17926a79 DH |
54 | |
55 | ret = kernel_sendmsg(local->socket, &msg, iov, 1, len); | |
56 | if (ret < 0) { | |
57 | _leave(" = -EAGAIN [sendmsg failed: %d]", ret); | |
58 | return -EAGAIN; | |
59 | } | |
60 | ||
61 | _leave(" = 0"); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | /* | |
66 | * accept an incoming call that needs peer, transport and/or connection setting | |
67 | * up | |
68 | */ | |
69 | static int rxrpc_accept_incoming_call(struct rxrpc_local *local, | |
70 | struct rxrpc_sock *rx, | |
71 | struct sk_buff *skb, | |
72 | struct sockaddr_rxrpc *srx) | |
73 | { | |
74 | struct rxrpc_connection *conn; | |
75 | struct rxrpc_transport *trans; | |
76 | struct rxrpc_skb_priv *sp, *nsp; | |
77 | struct rxrpc_peer *peer; | |
78 | struct rxrpc_call *call; | |
79 | struct sk_buff *notification; | |
80 | int ret; | |
81 | ||
82 | _enter(""); | |
83 | ||
84 | sp = rxrpc_skb(skb); | |
85 | ||
86 | /* get a notification message to send to the server app */ | |
87 | notification = alloc_skb(0, GFP_NOFS); | |
c3824d21 TH |
88 | if (!notification) { |
89 | _debug("no memory"); | |
90 | ret = -ENOMEM; | |
91 | goto error_nofree; | |
92 | } | |
17926a79 DH |
93 | rxrpc_new_skb(notification); |
94 | notification->mark = RXRPC_SKB_MARK_NEW_CALL; | |
95 | ||
96 | peer = rxrpc_get_peer(srx, GFP_NOIO); | |
97 | if (IS_ERR(peer)) { | |
98 | _debug("no peer"); | |
99 | ret = -EBUSY; | |
100 | goto error; | |
101 | } | |
102 | ||
103 | trans = rxrpc_get_transport(local, peer, GFP_NOIO); | |
104 | rxrpc_put_peer(peer); | |
34093d05 | 105 | if (IS_ERR(trans)) { |
17926a79 DH |
106 | _debug("no trans"); |
107 | ret = -EBUSY; | |
108 | goto error; | |
109 | } | |
110 | ||
111 | conn = rxrpc_incoming_connection(trans, &sp->hdr, GFP_NOIO); | |
112 | rxrpc_put_transport(trans); | |
113 | if (IS_ERR(conn)) { | |
114 | _debug("no conn"); | |
115 | ret = PTR_ERR(conn); | |
116 | goto error; | |
117 | } | |
118 | ||
119 | call = rxrpc_incoming_call(rx, conn, &sp->hdr, GFP_NOIO); | |
120 | rxrpc_put_connection(conn); | |
121 | if (IS_ERR(call)) { | |
122 | _debug("no call"); | |
123 | ret = PTR_ERR(call); | |
124 | goto error; | |
125 | } | |
126 | ||
127 | /* attach the call to the socket */ | |
128 | read_lock_bh(&local->services_lock); | |
129 | if (rx->sk.sk_state == RXRPC_CLOSE) | |
130 | goto invalid_service; | |
131 | ||
132 | write_lock(&rx->call_lock); | |
133 | if (!test_and_set_bit(RXRPC_CALL_INIT_ACCEPT, &call->flags)) { | |
134 | rxrpc_get_call(call); | |
135 | ||
136 | spin_lock(&call->conn->state_lock); | |
137 | if (sp->hdr.securityIndex > 0 && | |
138 | call->conn->state == RXRPC_CONN_SERVER_UNSECURED) { | |
139 | _debug("await conn sec"); | |
140 | list_add_tail(&call->accept_link, &rx->secureq); | |
141 | call->conn->state = RXRPC_CONN_SERVER_CHALLENGING; | |
142 | atomic_inc(&call->conn->usage); | |
143 | set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events); | |
651350d1 | 144 | rxrpc_queue_conn(call->conn); |
17926a79 DH |
145 | } else { |
146 | _debug("conn ready"); | |
147 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
148 | list_add_tail(&call->accept_link, &rx->acceptq); | |
149 | rxrpc_get_call(call); | |
150 | nsp = rxrpc_skb(notification); | |
151 | nsp->call = call; | |
152 | ||
153 | ASSERTCMP(atomic_read(&call->usage), >=, 3); | |
154 | ||
155 | _debug("notify"); | |
156 | spin_lock(&call->lock); | |
157 | ret = rxrpc_queue_rcv_skb(call, notification, true, | |
158 | false); | |
159 | spin_unlock(&call->lock); | |
160 | notification = NULL; | |
163e3cb7 | 161 | BUG_ON(ret < 0); |
17926a79 DH |
162 | } |
163 | spin_unlock(&call->conn->state_lock); | |
164 | ||
165 | _debug("queued"); | |
166 | } | |
167 | write_unlock(&rx->call_lock); | |
168 | ||
169 | _debug("process"); | |
170 | rxrpc_fast_process_packet(call, skb); | |
171 | ||
172 | _debug("done"); | |
173 | read_unlock_bh(&local->services_lock); | |
174 | rxrpc_free_skb(notification); | |
175 | rxrpc_put_call(call); | |
176 | _leave(" = 0"); | |
177 | return 0; | |
178 | ||
179 | invalid_service: | |
180 | _debug("invalid"); | |
181 | read_unlock_bh(&local->services_lock); | |
182 | ||
183 | read_lock_bh(&call->state_lock); | |
e721498a | 184 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && |
4c198ad1 | 185 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 | 186 | rxrpc_get_call(call); |
651350d1 | 187 | rxrpc_queue_call(call); |
17926a79 DH |
188 | } |
189 | read_unlock_bh(&call->state_lock); | |
190 | rxrpc_put_call(call); | |
191 | ret = -ECONNREFUSED; | |
192 | error: | |
193 | rxrpc_free_skb(notification); | |
c3824d21 | 194 | error_nofree: |
17926a79 DH |
195 | _leave(" = %d", ret); |
196 | return ret; | |
197 | } | |
198 | ||
199 | /* | |
200 | * accept incoming calls that need peer, transport and/or connection setting up | |
201 | * - the packets we get are all incoming client DATA packets that have seq == 1 | |
202 | */ | |
203 | void rxrpc_accept_incoming_calls(struct work_struct *work) | |
204 | { | |
205 | struct rxrpc_local *local = | |
206 | container_of(work, struct rxrpc_local, acceptor); | |
207 | struct rxrpc_skb_priv *sp; | |
208 | struct sockaddr_rxrpc srx; | |
209 | struct rxrpc_sock *rx; | |
0d12f8a4 | 210 | struct rxrpc_wire_header whdr; |
17926a79 | 211 | struct sk_buff *skb; |
17926a79 DH |
212 | int ret; |
213 | ||
214 | _enter("%d", local->debug_id); | |
215 | ||
216 | read_lock_bh(&rxrpc_local_lock); | |
217 | if (atomic_read(&local->usage) > 0) | |
218 | rxrpc_get_local(local); | |
219 | else | |
220 | local = NULL; | |
221 | read_unlock_bh(&rxrpc_local_lock); | |
222 | if (!local) { | |
223 | _leave(" [local dead]"); | |
224 | return; | |
225 | } | |
226 | ||
227 | process_next_packet: | |
228 | skb = skb_dequeue(&local->accept_queue); | |
229 | if (!skb) { | |
230 | rxrpc_put_local(local); | |
231 | _leave("\n"); | |
232 | return; | |
233 | } | |
234 | ||
235 | _net("incoming call skb %p", skb); | |
236 | ||
237 | sp = rxrpc_skb(skb); | |
238 | ||
0d12f8a4 DH |
239 | /* Set up a response packet header in case we need it */ |
240 | whdr.epoch = htonl(sp->hdr.epoch); | |
241 | whdr.cid = htonl(sp->hdr.cid); | |
242 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
243 | whdr.seq = htonl(sp->hdr.seq); | |
244 | whdr.serial = 0; | |
245 | whdr.flags = 0; | |
246 | whdr.type = 0; | |
247 | whdr.userStatus = 0; | |
248 | whdr.securityIndex = sp->hdr.securityIndex; | |
249 | whdr._rsvd = 0; | |
250 | whdr.serviceId = htons(sp->hdr.serviceId); | |
251 | ||
17926a79 DH |
252 | /* determine the remote address */ |
253 | memset(&srx, 0, sizeof(srx)); | |
254 | srx.srx_family = AF_RXRPC; | |
255 | srx.transport.family = local->srx.transport.family; | |
256 | srx.transport_type = local->srx.transport_type; | |
257 | switch (srx.transport.family) { | |
258 | case AF_INET: | |
259 | srx.transport_len = sizeof(struct sockaddr_in); | |
260 | srx.transport.sin.sin_port = udp_hdr(skb)->source; | |
261 | srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
262 | break; | |
263 | default: | |
264 | goto busy; | |
265 | } | |
266 | ||
267 | /* get the socket providing the service */ | |
17926a79 DH |
268 | read_lock_bh(&local->services_lock); |
269 | list_for_each_entry(rx, &local->services, listen_link) { | |
0d12f8a4 | 270 | if (rx->srx.srx_service == sp->hdr.serviceId && |
17926a79 DH |
271 | rx->sk.sk_state != RXRPC_CLOSE) |
272 | goto found_service; | |
273 | } | |
274 | read_unlock_bh(&local->services_lock); | |
275 | goto invalid_service; | |
276 | ||
277 | found_service: | |
0d12f8a4 | 278 | _debug("found service %hd", rx->srx.srx_service); |
17926a79 DH |
279 | if (sk_acceptq_is_full(&rx->sk)) |
280 | goto backlog_full; | |
281 | sk_acceptq_added(&rx->sk); | |
282 | sock_hold(&rx->sk); | |
283 | read_unlock_bh(&local->services_lock); | |
284 | ||
285 | ret = rxrpc_accept_incoming_call(local, rx, skb, &srx); | |
286 | if (ret < 0) | |
287 | sk_acceptq_removed(&rx->sk); | |
288 | sock_put(&rx->sk); | |
289 | switch (ret) { | |
290 | case -ECONNRESET: /* old calls are ignored */ | |
291 | case -ECONNABORTED: /* aborted calls are reaborted or ignored */ | |
292 | case 0: | |
293 | goto process_next_packet; | |
294 | case -ECONNREFUSED: | |
295 | goto invalid_service; | |
296 | case -EBUSY: | |
297 | goto busy; | |
298 | case -EKEYREJECTED: | |
299 | goto security_mismatch; | |
300 | default: | |
301 | BUG(); | |
302 | } | |
303 | ||
304 | backlog_full: | |
305 | read_unlock_bh(&local->services_lock); | |
306 | busy: | |
0d12f8a4 | 307 | rxrpc_busy(local, &srx, &whdr); |
17926a79 DH |
308 | rxrpc_free_skb(skb); |
309 | goto process_next_packet; | |
310 | ||
311 | invalid_service: | |
312 | skb->priority = RX_INVALID_OPERATION; | |
313 | rxrpc_reject_packet(local, skb); | |
314 | goto process_next_packet; | |
315 | ||
316 | /* can't change connection security type mid-flow */ | |
317 | security_mismatch: | |
318 | skb->priority = RX_PROTOCOL_ERROR; | |
319 | rxrpc_reject_packet(local, skb); | |
320 | goto process_next_packet; | |
321 | } | |
322 | ||
323 | /* | |
324 | * handle acceptance of a call by userspace | |
325 | * - assign the user call ID to the call at the front of the queue | |
326 | */ | |
651350d1 DH |
327 | struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx, |
328 | unsigned long user_call_ID) | |
17926a79 DH |
329 | { |
330 | struct rxrpc_call *call; | |
331 | struct rb_node *parent, **pp; | |
332 | int ret; | |
333 | ||
334 | _enter(",%lx", user_call_ID); | |
335 | ||
336 | ASSERT(!irqs_disabled()); | |
337 | ||
338 | write_lock(&rx->call_lock); | |
339 | ||
340 | ret = -ENODATA; | |
341 | if (list_empty(&rx->acceptq)) | |
342 | goto out; | |
343 | ||
344 | /* check the user ID isn't already in use */ | |
345 | ret = -EBADSLT; | |
346 | pp = &rx->calls.rb_node; | |
347 | parent = NULL; | |
348 | while (*pp) { | |
349 | parent = *pp; | |
350 | call = rb_entry(parent, struct rxrpc_call, sock_node); | |
351 | ||
352 | if (user_call_ID < call->user_call_ID) | |
353 | pp = &(*pp)->rb_left; | |
354 | else if (user_call_ID > call->user_call_ID) | |
355 | pp = &(*pp)->rb_right; | |
356 | else | |
357 | goto out; | |
358 | } | |
359 | ||
360 | /* dequeue the first call and check it's still valid */ | |
361 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); | |
362 | list_del_init(&call->accept_link); | |
363 | sk_acceptq_removed(&rx->sk); | |
364 | ||
365 | write_lock_bh(&call->state_lock); | |
366 | switch (call->state) { | |
367 | case RXRPC_CALL_SERVER_ACCEPTING: | |
368 | call->state = RXRPC_CALL_SERVER_RECV_REQUEST; | |
369 | break; | |
370 | case RXRPC_CALL_REMOTELY_ABORTED: | |
371 | case RXRPC_CALL_LOCALLY_ABORTED: | |
372 | ret = -ECONNABORTED; | |
373 | goto out_release; | |
374 | case RXRPC_CALL_NETWORK_ERROR: | |
375 | ret = call->conn->error; | |
376 | goto out_release; | |
377 | case RXRPC_CALL_DEAD: | |
378 | ret = -ETIME; | |
379 | goto out_discard; | |
380 | default: | |
381 | BUG(); | |
382 | } | |
383 | ||
384 | /* formalise the acceptance */ | |
385 | call->user_call_ID = user_call_ID; | |
386 | rb_link_node(&call->sock_node, parent, pp); | |
387 | rb_insert_color(&call->sock_node, &rx->calls); | |
388 | if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags)) | |
389 | BUG(); | |
4c198ad1 | 390 | if (test_and_set_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) |
17926a79 | 391 | BUG(); |
651350d1 | 392 | rxrpc_queue_call(call); |
17926a79 | 393 | |
651350d1 | 394 | rxrpc_get_call(call); |
17926a79 DH |
395 | write_unlock_bh(&call->state_lock); |
396 | write_unlock(&rx->call_lock); | |
651350d1 DH |
397 | _leave(" = %p{%d}", call, call->debug_id); |
398 | return call; | |
399 | ||
400 | /* if the call is already dying or dead, then we leave the socket's ref | |
401 | * on it to be released by rxrpc_dead_call_expired() as induced by | |
402 | * rxrpc_release_call() */ | |
403 | out_release: | |
404 | _debug("release %p", call); | |
405 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 406 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 DH |
407 | rxrpc_queue_call(call); |
408 | out_discard: | |
409 | write_unlock_bh(&call->state_lock); | |
410 | _debug("discard %p", call); | |
411 | out: | |
412 | write_unlock(&rx->call_lock); | |
413 | _leave(" = %d", ret); | |
414 | return ERR_PTR(ret); | |
415 | } | |
416 | ||
417 | /* | |
b4f1342f | 418 | * Handle rejection of a call by userspace |
651350d1 DH |
419 | * - reject the call at the front of the queue |
420 | */ | |
421 | int rxrpc_reject_call(struct rxrpc_sock *rx) | |
422 | { | |
423 | struct rxrpc_call *call; | |
424 | int ret; | |
425 | ||
426 | _enter(""); | |
427 | ||
428 | ASSERT(!irqs_disabled()); | |
429 | ||
430 | write_lock(&rx->call_lock); | |
431 | ||
432 | ret = -ENODATA; | |
433 | if (list_empty(&rx->acceptq)) | |
434 | goto out; | |
435 | ||
436 | /* dequeue the first call and check it's still valid */ | |
437 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); | |
438 | list_del_init(&call->accept_link); | |
439 | sk_acceptq_removed(&rx->sk); | |
440 | ||
441 | write_lock_bh(&call->state_lock); | |
442 | switch (call->state) { | |
443 | case RXRPC_CALL_SERVER_ACCEPTING: | |
444 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 445 | if (test_and_set_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) |
651350d1 DH |
446 | rxrpc_queue_call(call); |
447 | ret = 0; | |
448 | goto out_release; | |
449 | case RXRPC_CALL_REMOTELY_ABORTED: | |
450 | case RXRPC_CALL_LOCALLY_ABORTED: | |
451 | ret = -ECONNABORTED; | |
452 | goto out_release; | |
453 | case RXRPC_CALL_NETWORK_ERROR: | |
454 | ret = call->conn->error; | |
455 | goto out_release; | |
456 | case RXRPC_CALL_DEAD: | |
457 | ret = -ETIME; | |
458 | goto out_discard; | |
459 | default: | |
460 | BUG(); | |
461 | } | |
17926a79 DH |
462 | |
463 | /* if the call is already dying or dead, then we leave the socket's ref | |
464 | * on it to be released by rxrpc_dead_call_expired() as induced by | |
465 | * rxrpc_release_call() */ | |
466 | out_release: | |
467 | _debug("release %p", call); | |
468 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 469 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 | 470 | rxrpc_queue_call(call); |
17926a79 DH |
471 | out_discard: |
472 | write_unlock_bh(&call->state_lock); | |
473 | _debug("discard %p", call); | |
474 | out: | |
475 | write_unlock(&rx->call_lock); | |
476 | _leave(" = %d", ret); | |
477 | return ret; | |
478 | } | |
651350d1 DH |
479 | |
480 | /** | |
481 | * rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call | |
482 | * @sock: The socket on which the impending call is waiting | |
483 | * @user_call_ID: The tag to attach to the call | |
484 | * | |
485 | * Allow a kernel service to accept an incoming call, assuming the incoming | |
486 | * call is still valid. | |
487 | */ | |
488 | struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock, | |
489 | unsigned long user_call_ID) | |
490 | { | |
491 | struct rxrpc_call *call; | |
492 | ||
493 | _enter(",%lx", user_call_ID); | |
494 | call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID); | |
495 | _leave(" = %p", call); | |
496 | return call; | |
497 | } | |
651350d1 DH |
498 | EXPORT_SYMBOL(rxrpc_kernel_accept_call); |
499 | ||
500 | /** | |
501 | * rxrpc_kernel_reject_call - Allow a kernel service to reject an incoming call | |
502 | * @sock: The socket on which the impending call is waiting | |
503 | * | |
504 | * Allow a kernel service to reject an incoming call with a BUSY message, | |
505 | * assuming the incoming call is still valid. | |
506 | */ | |
507 | int rxrpc_kernel_reject_call(struct socket *sock) | |
508 | { | |
509 | int ret; | |
510 | ||
511 | _enter(""); | |
512 | ret = rxrpc_reject_call(rxrpc_sk(sock->sk)); | |
513 | _leave(" = %d", ret); | |
514 | return ret; | |
515 | } | |
651350d1 | 516 | EXPORT_SYMBOL(rxrpc_kernel_reject_call); |