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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> |
20 | #include <linux/gfp.h> |
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, |
30 | struct rxrpc_header *hdr) |
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 | |
39 | msg.msg_name = &srx->transport.sin; |
40 | msg.msg_namelen = sizeof(srx->transport.sin); |
41 | msg.msg_control = NULL; |
42 | msg.msg_controllen = 0; |
43 | msg.msg_flags = 0; |
44 | |
45 | hdr->seq = 0; |
46 | hdr->type = RXRPC_PACKET_TYPE_BUSY; |
47 | hdr->flags = 0; |
48 | hdr->userStatus = 0; |
49 | hdr->_rsvd = 0; |
50 | |
51 | iov[0].iov_base = hdr; |
52 | iov[0].iov_len = sizeof(*hdr); |
53 | |
54 | len = iov[0].iov_len; |
55 | |
56 | hdr->serial = htonl(1); |
57 | _proto("Tx BUSY %%%u", ntohl(hdr->serial)); |
58 | |
59 | ret = kernel_sendmsg(local->socket, &msg, iov, 1, len); |
60 | if (ret < 0) { |
61 | _leave(" = -EAGAIN [sendmsg failed: %d]", ret); |
62 | return -EAGAIN; |
63 | } |
64 | |
65 | _leave(" = 0"); |
66 | return 0; |
67 | } |
68 | |
69 | /* |
70 | * accept an incoming call that needs peer, transport and/or connection setting |
71 | * up |
72 | */ |
73 | static int rxrpc_accept_incoming_call(struct rxrpc_local *local, |
74 | struct rxrpc_sock *rx, |
75 | struct sk_buff *skb, |
76 | struct sockaddr_rxrpc *srx) |
77 | { |
78 | struct rxrpc_connection *conn; |
79 | struct rxrpc_transport *trans; |
80 | struct rxrpc_skb_priv *sp, *nsp; |
81 | struct rxrpc_peer *peer; |
82 | struct rxrpc_call *call; |
83 | struct sk_buff *notification; |
84 | int ret; |
85 | |
86 | _enter(""); |
87 | |
88 | sp = rxrpc_skb(skb); |
89 | |
90 | /* get a notification message to send to the server app */ |
91 | notification = alloc_skb(0, GFP_NOFS); |
92 | if (!notification) { |
93 | _debug("no memory"); |
94 | ret = -ENOMEM; |
95 | goto error_nofree; |
96 | } |
97 | rxrpc_new_skb(notification); |
98 | notification->mark = RXRPC_SKB_MARK_NEW_CALL; |
99 | |
100 | peer = rxrpc_get_peer(srx, GFP_NOIO); |
101 | if (IS_ERR(peer)) { |
102 | _debug("no peer"); |
103 | ret = -EBUSY; |
104 | goto error; |
105 | } |
106 | |
107 | trans = rxrpc_get_transport(local, peer, GFP_NOIO); |
108 | rxrpc_put_peer(peer); |
109 | if (IS_ERR(trans)) { |
110 | _debug("no trans"); |
111 | ret = -EBUSY; |
112 | goto error; |
113 | } |
114 | |
115 | conn = rxrpc_incoming_connection(trans, &sp->hdr, GFP_NOIO); |
116 | rxrpc_put_transport(trans); |
117 | if (IS_ERR(conn)) { |
118 | _debug("no conn"); |
119 | ret = PTR_ERR(conn); |
120 | goto error; |
121 | } |
122 | |
123 | call = rxrpc_incoming_call(rx, conn, &sp->hdr, GFP_NOIO); |
124 | rxrpc_put_connection(conn); |
125 | if (IS_ERR(call)) { |
126 | _debug("no call"); |
127 | ret = PTR_ERR(call); |
128 | goto error; |
129 | } |
130 | |
131 | /* attach the call to the socket */ |
132 | read_lock_bh(&local->services_lock); |
133 | if (rx->sk.sk_state == RXRPC_CLOSE) |
134 | goto invalid_service; |
135 | |
136 | write_lock(&rx->call_lock); |
137 | if (!test_and_set_bit(RXRPC_CALL_INIT_ACCEPT, &call->flags)) { |
138 | rxrpc_get_call(call); |
139 | |
140 | spin_lock(&call->conn->state_lock); |
141 | if (sp->hdr.securityIndex > 0 && |
142 | call->conn->state == RXRPC_CONN_SERVER_UNSECURED) { |
143 | _debug("await conn sec"); |
144 | list_add_tail(&call->accept_link, &rx->secureq); |
145 | call->conn->state = RXRPC_CONN_SERVER_CHALLENGING; |
146 | atomic_inc(&call->conn->usage); |
147 | set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events); |
148 | rxrpc_queue_conn(call->conn); |
149 | } else { |
150 | _debug("conn ready"); |
151 | call->state = RXRPC_CALL_SERVER_ACCEPTING; |
152 | list_add_tail(&call->accept_link, &rx->acceptq); |
153 | rxrpc_get_call(call); |
154 | nsp = rxrpc_skb(notification); |
155 | nsp->call = call; |
156 | |
157 | ASSERTCMP(atomic_read(&call->usage), >=, 3); |
158 | |
159 | _debug("notify"); |
160 | spin_lock(&call->lock); |
161 | ret = rxrpc_queue_rcv_skb(call, notification, true, |
162 | false); |
163 | spin_unlock(&call->lock); |
164 | notification = NULL; |
165 | BUG_ON(ret < 0); |
166 | } |
167 | spin_unlock(&call->conn->state_lock); |
168 | |
169 | _debug("queued"); |
170 | } |
171 | write_unlock(&rx->call_lock); |
172 | |
173 | _debug("process"); |
174 | rxrpc_fast_process_packet(call, skb); |
175 | |
176 | _debug("done"); |
177 | read_unlock_bh(&local->services_lock); |
178 | rxrpc_free_skb(notification); |
179 | rxrpc_put_call(call); |
180 | _leave(" = 0"); |
181 | return 0; |
182 | |
183 | invalid_service: |
184 | _debug("invalid"); |
185 | read_unlock_bh(&local->services_lock); |
186 | |
187 | read_lock_bh(&call->state_lock); |
188 | if (!test_bit(RXRPC_CALL_RELEASE, &call->flags) && |
189 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) { |
190 | rxrpc_get_call(call); |
191 | rxrpc_queue_call(call); |
192 | } |
193 | read_unlock_bh(&call->state_lock); |
194 | rxrpc_put_call(call); |
195 | ret = -ECONNREFUSED; |
196 | error: |
197 | rxrpc_free_skb(notification); |
198 | error_nofree: |
199 | _leave(" = %d", ret); |
200 | return ret; |
201 | } |
202 | |
203 | /* |
204 | * accept incoming calls that need peer, transport and/or connection setting up |
205 | * - the packets we get are all incoming client DATA packets that have seq == 1 |
206 | */ |
207 | void rxrpc_accept_incoming_calls(struct work_struct *work) |
208 | { |
209 | struct rxrpc_local *local = |
210 | container_of(work, struct rxrpc_local, acceptor); |
211 | struct rxrpc_skb_priv *sp; |
212 | struct sockaddr_rxrpc srx; |
213 | struct rxrpc_sock *rx; |
214 | struct sk_buff *skb; |
215 | __be16 service_id; |
216 | int ret; |
217 | |
218 | _enter("%d", local->debug_id); |
219 | |
220 | read_lock_bh(&rxrpc_local_lock); |
221 | if (atomic_read(&local->usage) > 0) |
222 | rxrpc_get_local(local); |
223 | else |
224 | local = NULL; |
225 | read_unlock_bh(&rxrpc_local_lock); |
226 | if (!local) { |
227 | _leave(" [local dead]"); |
228 | return; |
229 | } |
230 | |
231 | process_next_packet: |
232 | skb = skb_dequeue(&local->accept_queue); |
233 | if (!skb) { |
234 | rxrpc_put_local(local); |
235 | _leave("\n"); |
236 | return; |
237 | } |
238 | |
239 | _net("incoming call skb %p", skb); |
240 | |
241 | sp = rxrpc_skb(skb); |
242 | |
243 | /* determine the remote address */ |
244 | memset(&srx, 0, sizeof(srx)); |
245 | srx.srx_family = AF_RXRPC; |
246 | srx.transport.family = local->srx.transport.family; |
247 | srx.transport_type = local->srx.transport_type; |
248 | switch (srx.transport.family) { |
249 | case AF_INET: |
250 | srx.transport_len = sizeof(struct sockaddr_in); |
251 | srx.transport.sin.sin_port = udp_hdr(skb)->source; |
252 | srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; |
253 | break; |
254 | default: |
255 | goto busy; |
256 | } |
257 | |
258 | /* get the socket providing the service */ |
259 | service_id = sp->hdr.serviceId; |
260 | read_lock_bh(&local->services_lock); |
261 | list_for_each_entry(rx, &local->services, listen_link) { |
262 | if (rx->service_id == service_id && |
263 | rx->sk.sk_state != RXRPC_CLOSE) |
264 | goto found_service; |
265 | } |
266 | read_unlock_bh(&local->services_lock); |
267 | goto invalid_service; |
268 | |
269 | found_service: |
270 | _debug("found service %hd", ntohs(rx->service_id)); |
271 | if (sk_acceptq_is_full(&rx->sk)) |
272 | goto backlog_full; |
273 | sk_acceptq_added(&rx->sk); |
274 | sock_hold(&rx->sk); |
275 | read_unlock_bh(&local->services_lock); |
276 | |
277 | ret = rxrpc_accept_incoming_call(local, rx, skb, &srx); |
278 | if (ret < 0) |
279 | sk_acceptq_removed(&rx->sk); |
280 | sock_put(&rx->sk); |
281 | switch (ret) { |
282 | case -ECONNRESET: /* old calls are ignored */ |
283 | case -ECONNABORTED: /* aborted calls are reaborted or ignored */ |
284 | case 0: |
285 | goto process_next_packet; |
286 | case -ECONNREFUSED: |
287 | goto invalid_service; |
288 | case -EBUSY: |
289 | goto busy; |
290 | case -EKEYREJECTED: |
291 | goto security_mismatch; |
292 | default: |
293 | BUG(); |
294 | } |
295 | |
296 | backlog_full: |
297 | read_unlock_bh(&local->services_lock); |
298 | busy: |
299 | rxrpc_busy(local, &srx, &sp->hdr); |
300 | rxrpc_free_skb(skb); |
301 | goto process_next_packet; |
302 | |
303 | invalid_service: |
304 | skb->priority = RX_INVALID_OPERATION; |
305 | rxrpc_reject_packet(local, skb); |
306 | goto process_next_packet; |
307 | |
308 | /* can't change connection security type mid-flow */ |
309 | security_mismatch: |
310 | skb->priority = RX_PROTOCOL_ERROR; |
311 | rxrpc_reject_packet(local, skb); |
312 | goto process_next_packet; |
313 | } |
314 | |
315 | /* |
316 | * handle acceptance of a call by userspace |
317 | * - assign the user call ID to the call at the front of the queue |
318 | */ |
319 | struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx, |
320 | unsigned long user_call_ID) |
321 | { |
322 | struct rxrpc_call *call; |
323 | struct rb_node *parent, **pp; |
324 | int ret; |
325 | |
326 | _enter(",%lx", user_call_ID); |
327 | |
328 | ASSERT(!irqs_disabled()); |
329 | |
330 | write_lock(&rx->call_lock); |
331 | |
332 | ret = -ENODATA; |
333 | if (list_empty(&rx->acceptq)) |
334 | goto out; |
335 | |
336 | /* check the user ID isn't already in use */ |
337 | ret = -EBADSLT; |
338 | pp = &rx->calls.rb_node; |
339 | parent = NULL; |
340 | while (*pp) { |
341 | parent = *pp; |
342 | call = rb_entry(parent, struct rxrpc_call, sock_node); |
343 | |
344 | if (user_call_ID < call->user_call_ID) |
345 | pp = &(*pp)->rb_left; |
346 | else if (user_call_ID > call->user_call_ID) |
347 | pp = &(*pp)->rb_right; |
348 | else |
349 | goto out; |
350 | } |
351 | |
352 | /* dequeue the first call and check it's still valid */ |
353 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); |
354 | list_del_init(&call->accept_link); |
355 | sk_acceptq_removed(&rx->sk); |
356 | |
357 | write_lock_bh(&call->state_lock); |
358 | switch (call->state) { |
359 | case RXRPC_CALL_SERVER_ACCEPTING: |
360 | call->state = RXRPC_CALL_SERVER_RECV_REQUEST; |
361 | break; |
362 | case RXRPC_CALL_REMOTELY_ABORTED: |
363 | case RXRPC_CALL_LOCALLY_ABORTED: |
364 | ret = -ECONNABORTED; |
365 | goto out_release; |
366 | case RXRPC_CALL_NETWORK_ERROR: |
367 | ret = call->conn->error; |
368 | goto out_release; |
369 | case RXRPC_CALL_DEAD: |
370 | ret = -ETIME; |
371 | goto out_discard; |
372 | default: |
373 | BUG(); |
374 | } |
375 | |
376 | /* formalise the acceptance */ |
377 | call->user_call_ID = user_call_ID; |
378 | rb_link_node(&call->sock_node, parent, pp); |
379 | rb_insert_color(&call->sock_node, &rx->calls); |
380 | if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags)) |
381 | BUG(); |
382 | if (test_and_set_bit(RXRPC_CALL_ACCEPTED, &call->events)) |
383 | BUG(); |
384 | rxrpc_queue_call(call); |
385 | |
386 | rxrpc_get_call(call); |
387 | write_unlock_bh(&call->state_lock); |
388 | write_unlock(&rx->call_lock); |
389 | _leave(" = %p{%d}", call, call->debug_id); |
390 | return call; |
391 | |
392 | /* if the call is already dying or dead, then we leave the socket's ref |
393 | * on it to be released by rxrpc_dead_call_expired() as induced by |
394 | * rxrpc_release_call() */ |
395 | out_release: |
396 | _debug("release %p", call); |
397 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && |
398 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) |
399 | rxrpc_queue_call(call); |
400 | out_discard: |
401 | write_unlock_bh(&call->state_lock); |
402 | _debug("discard %p", call); |
403 | out: |
404 | write_unlock(&rx->call_lock); |
405 | _leave(" = %d", ret); |
406 | return ERR_PTR(ret); |
407 | } |
408 | |
409 | /* |
410 | * handle rejectance of a call by userspace |
411 | * - reject the call at the front of the queue |
412 | */ |
413 | int rxrpc_reject_call(struct rxrpc_sock *rx) |
414 | { |
415 | struct rxrpc_call *call; |
416 | int ret; |
417 | |
418 | _enter(""); |
419 | |
420 | ASSERT(!irqs_disabled()); |
421 | |
422 | write_lock(&rx->call_lock); |
423 | |
424 | ret = -ENODATA; |
425 | if (list_empty(&rx->acceptq)) |
426 | goto out; |
427 | |
428 | /* dequeue the first call and check it's still valid */ |
429 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); |
430 | list_del_init(&call->accept_link); |
431 | sk_acceptq_removed(&rx->sk); |
432 | |
433 | write_lock_bh(&call->state_lock); |
434 | switch (call->state) { |
435 | case RXRPC_CALL_SERVER_ACCEPTING: |
436 | call->state = RXRPC_CALL_SERVER_BUSY; |
437 | if (test_and_set_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) |
438 | rxrpc_queue_call(call); |
439 | ret = 0; |
440 | goto out_release; |
441 | case RXRPC_CALL_REMOTELY_ABORTED: |
442 | case RXRPC_CALL_LOCALLY_ABORTED: |
443 | ret = -ECONNABORTED; |
444 | goto out_release; |
445 | case RXRPC_CALL_NETWORK_ERROR: |
446 | ret = call->conn->error; |
447 | goto out_release; |
448 | case RXRPC_CALL_DEAD: |
449 | ret = -ETIME; |
450 | goto out_discard; |
451 | default: |
452 | BUG(); |
453 | } |
454 | |
455 | /* if the call is already dying or dead, then we leave the socket's ref |
456 | * on it to be released by rxrpc_dead_call_expired() as induced by |
457 | * rxrpc_release_call() */ |
458 | out_release: |
459 | _debug("release %p", call); |
460 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && |
461 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) |
462 | rxrpc_queue_call(call); |
463 | out_discard: |
464 | write_unlock_bh(&call->state_lock); |
465 | _debug("discard %p", call); |
466 | out: |
467 | write_unlock(&rx->call_lock); |
468 | _leave(" = %d", ret); |
469 | return ret; |
470 | } |
471 | |
472 | /** |
473 | * rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call |
474 | * @sock: The socket on which the impending call is waiting |
475 | * @user_call_ID: The tag to attach to the call |
476 | * |
477 | * Allow a kernel service to accept an incoming call, assuming the incoming |
478 | * call is still valid. |
479 | */ |
480 | struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock, |
481 | unsigned long user_call_ID) |
482 | { |
483 | struct rxrpc_call *call; |
484 | |
485 | _enter(",%lx", user_call_ID); |
486 | call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID); |
487 | _leave(" = %p", call); |
488 | return call; |
489 | } |
490 | |
491 | EXPORT_SYMBOL(rxrpc_kernel_accept_call); |
492 | |
493 | /** |
494 | * rxrpc_kernel_reject_call - Allow a kernel service to reject an incoming call |
495 | * @sock: The socket on which the impending call is waiting |
496 | * |
497 | * Allow a kernel service to reject an incoming call with a BUSY message, |
498 | * assuming the incoming call is still valid. |
499 | */ |
500 | int rxrpc_kernel_reject_call(struct socket *sock) |
501 | { |
502 | int ret; |
503 | |
504 | _enter(""); |
505 | ret = rxrpc_reject_call(rxrpc_sk(sock->sk)); |
506 | _leave(" = %d", ret); |
507 | return ret; |
508 | } |
509 | |
510 | EXPORT_SYMBOL(rxrpc_kernel_reject_call); |
511 |
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