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Commit | Line | Data |
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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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/net.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/errqueue.h> | |
18 | #include <linux/udp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/in6.h> | |
21 | #include <linux/icmp.h> | |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include <net/ip.h> | |
26 | #include "ar-internal.h" | |
27 | ||
28 | /* | |
29 | * generate a connection-level abort | |
30 | */ | |
31 | static int rxrpc_busy(struct rxrpc_local *local, struct sockaddr_rxrpc *srx, | |
0d12f8a4 | 32 | struct rxrpc_wire_header *whdr) |
17926a79 DH |
33 | { |
34 | struct msghdr msg; | |
35 | struct kvec iov[1]; | |
36 | size_t len; | |
37 | int ret; | |
38 | ||
39 | _enter("%d,,", local->debug_id); | |
40 | ||
0d12f8a4 DH |
41 | whdr->type = RXRPC_PACKET_TYPE_BUSY; |
42 | whdr->serial = htonl(1); | |
43 | ||
17926a79 DH |
44 | msg.msg_name = &srx->transport.sin; |
45 | msg.msg_namelen = sizeof(srx->transport.sin); | |
46 | msg.msg_control = NULL; | |
47 | msg.msg_controllen = 0; | |
48 | msg.msg_flags = 0; | |
49 | ||
0d12f8a4 DH |
50 | iov[0].iov_base = whdr; |
51 | iov[0].iov_len = sizeof(*whdr); | |
17926a79 DH |
52 | |
53 | len = iov[0].iov_len; | |
54 | ||
0d12f8a4 | 55 | _proto("Tx BUSY %%1"); |
17926a79 DH |
56 | |
57 | ret = kernel_sendmsg(local->socket, &msg, iov, 1, len); | |
58 | if (ret < 0) { | |
59 | _leave(" = -EAGAIN [sendmsg failed: %d]", ret); | |
60 | return -EAGAIN; | |
61 | } | |
62 | ||
63 | _leave(" = 0"); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | /* | |
68 | * accept an incoming call that needs peer, transport and/or connection setting | |
69 | * up | |
70 | */ | |
71 | static int rxrpc_accept_incoming_call(struct rxrpc_local *local, | |
72 | struct rxrpc_sock *rx, | |
73 | struct sk_buff *skb, | |
74 | struct sockaddr_rxrpc *srx) | |
75 | { | |
76 | struct rxrpc_connection *conn; | |
77 | struct rxrpc_transport *trans; | |
78 | struct rxrpc_skb_priv *sp, *nsp; | |
79 | struct rxrpc_peer *peer; | |
80 | struct rxrpc_call *call; | |
81 | struct sk_buff *notification; | |
82 | int ret; | |
83 | ||
84 | _enter(""); | |
85 | ||
86 | sp = rxrpc_skb(skb); | |
87 | ||
88 | /* get a notification message to send to the server app */ | |
89 | notification = alloc_skb(0, GFP_NOFS); | |
c3824d21 TH |
90 | if (!notification) { |
91 | _debug("no memory"); | |
92 | ret = -ENOMEM; | |
93 | goto error_nofree; | |
94 | } | |
17926a79 DH |
95 | rxrpc_new_skb(notification); |
96 | notification->mark = RXRPC_SKB_MARK_NEW_CALL; | |
97 | ||
be6e6707 | 98 | peer = rxrpc_lookup_peer(local, srx, GFP_NOIO); |
0e4699e4 | 99 | if (!peer) { |
17926a79 DH |
100 | _debug("no peer"); |
101 | ret = -EBUSY; | |
102 | goto error; | |
103 | } | |
104 | ||
105 | trans = rxrpc_get_transport(local, peer, GFP_NOIO); | |
106 | rxrpc_put_peer(peer); | |
34093d05 | 107 | if (IS_ERR(trans)) { |
17926a79 DH |
108 | _debug("no trans"); |
109 | ret = -EBUSY; | |
110 | goto error; | |
111 | } | |
112 | ||
843099ca | 113 | conn = rxrpc_incoming_connection(trans, &sp->hdr); |
17926a79 DH |
114 | rxrpc_put_transport(trans); |
115 | if (IS_ERR(conn)) { | |
116 | _debug("no conn"); | |
117 | ret = PTR_ERR(conn); | |
118 | goto error; | |
119 | } | |
120 | ||
843099ca | 121 | call = rxrpc_incoming_call(rx, conn, &sp->hdr); |
17926a79 DH |
122 | rxrpc_put_connection(conn); |
123 | if (IS_ERR(call)) { | |
124 | _debug("no call"); | |
125 | ret = PTR_ERR(call); | |
126 | goto error; | |
127 | } | |
128 | ||
129 | /* attach the call to the socket */ | |
130 | read_lock_bh(&local->services_lock); | |
131 | if (rx->sk.sk_state == RXRPC_CLOSE) | |
132 | goto invalid_service; | |
133 | ||
134 | write_lock(&rx->call_lock); | |
135 | if (!test_and_set_bit(RXRPC_CALL_INIT_ACCEPT, &call->flags)) { | |
136 | rxrpc_get_call(call); | |
137 | ||
138 | spin_lock(&call->conn->state_lock); | |
139 | if (sp->hdr.securityIndex > 0 && | |
140 | call->conn->state == RXRPC_CONN_SERVER_UNSECURED) { | |
141 | _debug("await conn sec"); | |
142 | list_add_tail(&call->accept_link, &rx->secureq); | |
143 | call->conn->state = RXRPC_CONN_SERVER_CHALLENGING; | |
144 | atomic_inc(&call->conn->usage); | |
145 | set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events); | |
651350d1 | 146 | rxrpc_queue_conn(call->conn); |
17926a79 DH |
147 | } else { |
148 | _debug("conn ready"); | |
149 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
150 | list_add_tail(&call->accept_link, &rx->acceptq); | |
151 | rxrpc_get_call(call); | |
152 | nsp = rxrpc_skb(notification); | |
153 | nsp->call = call; | |
154 | ||
155 | ASSERTCMP(atomic_read(&call->usage), >=, 3); | |
156 | ||
157 | _debug("notify"); | |
158 | spin_lock(&call->lock); | |
159 | ret = rxrpc_queue_rcv_skb(call, notification, true, | |
160 | false); | |
161 | spin_unlock(&call->lock); | |
162 | notification = NULL; | |
163e3cb7 | 163 | BUG_ON(ret < 0); |
17926a79 DH |
164 | } |
165 | spin_unlock(&call->conn->state_lock); | |
166 | ||
167 | _debug("queued"); | |
168 | } | |
169 | write_unlock(&rx->call_lock); | |
170 | ||
171 | _debug("process"); | |
172 | rxrpc_fast_process_packet(call, skb); | |
173 | ||
174 | _debug("done"); | |
175 | read_unlock_bh(&local->services_lock); | |
176 | rxrpc_free_skb(notification); | |
177 | rxrpc_put_call(call); | |
178 | _leave(" = 0"); | |
179 | return 0; | |
180 | ||
181 | invalid_service: | |
182 | _debug("invalid"); | |
183 | read_unlock_bh(&local->services_lock); | |
184 | ||
185 | read_lock_bh(&call->state_lock); | |
e721498a | 186 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && |
4c198ad1 | 187 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 | 188 | rxrpc_get_call(call); |
651350d1 | 189 | rxrpc_queue_call(call); |
17926a79 DH |
190 | } |
191 | read_unlock_bh(&call->state_lock); | |
192 | rxrpc_put_call(call); | |
193 | ret = -ECONNREFUSED; | |
194 | error: | |
195 | rxrpc_free_skb(notification); | |
c3824d21 | 196 | error_nofree: |
17926a79 DH |
197 | _leave(" = %d", ret); |
198 | return ret; | |
199 | } | |
200 | ||
201 | /* | |
202 | * accept incoming calls that need peer, transport and/or connection setting up | |
203 | * - the packets we get are all incoming client DATA packets that have seq == 1 | |
204 | */ | |
4f95dd78 | 205 | void rxrpc_accept_incoming_calls(struct rxrpc_local *local) |
17926a79 | 206 | { |
17926a79 DH |
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 | ||
17926a79 DH |
216 | skb = skb_dequeue(&local->accept_queue); |
217 | if (!skb) { | |
17926a79 DH |
218 | _leave("\n"); |
219 | return; | |
220 | } | |
221 | ||
222 | _net("incoming call skb %p", skb); | |
223 | ||
224 | sp = rxrpc_skb(skb); | |
225 | ||
0d12f8a4 DH |
226 | /* Set up a response packet header in case we need it */ |
227 | whdr.epoch = htonl(sp->hdr.epoch); | |
228 | whdr.cid = htonl(sp->hdr.cid); | |
229 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
230 | whdr.seq = htonl(sp->hdr.seq); | |
231 | whdr.serial = 0; | |
232 | whdr.flags = 0; | |
233 | whdr.type = 0; | |
234 | whdr.userStatus = 0; | |
235 | whdr.securityIndex = sp->hdr.securityIndex; | |
236 | whdr._rsvd = 0; | |
237 | whdr.serviceId = htons(sp->hdr.serviceId); | |
238 | ||
17926a79 DH |
239 | /* determine the remote address */ |
240 | memset(&srx, 0, sizeof(srx)); | |
241 | srx.srx_family = AF_RXRPC; | |
242 | srx.transport.family = local->srx.transport.family; | |
243 | srx.transport_type = local->srx.transport_type; | |
244 | switch (srx.transport.family) { | |
245 | case AF_INET: | |
246 | srx.transport_len = sizeof(struct sockaddr_in); | |
247 | srx.transport.sin.sin_port = udp_hdr(skb)->source; | |
248 | srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
249 | break; | |
250 | default: | |
251 | goto busy; | |
252 | } | |
253 | ||
254 | /* get the socket providing the service */ | |
17926a79 DH |
255 | read_lock_bh(&local->services_lock); |
256 | list_for_each_entry(rx, &local->services, listen_link) { | |
0d12f8a4 | 257 | if (rx->srx.srx_service == sp->hdr.serviceId && |
17926a79 DH |
258 | rx->sk.sk_state != RXRPC_CLOSE) |
259 | goto found_service; | |
260 | } | |
261 | read_unlock_bh(&local->services_lock); | |
262 | goto invalid_service; | |
263 | ||
264 | found_service: | |
0d12f8a4 | 265 | _debug("found service %hd", rx->srx.srx_service); |
17926a79 DH |
266 | if (sk_acceptq_is_full(&rx->sk)) |
267 | goto backlog_full; | |
268 | sk_acceptq_added(&rx->sk); | |
269 | sock_hold(&rx->sk); | |
270 | read_unlock_bh(&local->services_lock); | |
271 | ||
272 | ret = rxrpc_accept_incoming_call(local, rx, skb, &srx); | |
273 | if (ret < 0) | |
274 | sk_acceptq_removed(&rx->sk); | |
275 | sock_put(&rx->sk); | |
276 | switch (ret) { | |
277 | case -ECONNRESET: /* old calls are ignored */ | |
278 | case -ECONNABORTED: /* aborted calls are reaborted or ignored */ | |
279 | case 0: | |
4f95dd78 | 280 | return; |
17926a79 DH |
281 | case -ECONNREFUSED: |
282 | goto invalid_service; | |
283 | case -EBUSY: | |
284 | goto busy; | |
285 | case -EKEYREJECTED: | |
286 | goto security_mismatch; | |
287 | default: | |
288 | BUG(); | |
289 | } | |
290 | ||
291 | backlog_full: | |
292 | read_unlock_bh(&local->services_lock); | |
293 | busy: | |
0d12f8a4 | 294 | rxrpc_busy(local, &srx, &whdr); |
17926a79 | 295 | rxrpc_free_skb(skb); |
4f95dd78 | 296 | return; |
17926a79 DH |
297 | |
298 | invalid_service: | |
299 | skb->priority = RX_INVALID_OPERATION; | |
300 | rxrpc_reject_packet(local, skb); | |
4f95dd78 | 301 | return; |
17926a79 DH |
302 | |
303 | /* can't change connection security type mid-flow */ | |
304 | security_mismatch: | |
305 | skb->priority = RX_PROTOCOL_ERROR; | |
306 | rxrpc_reject_packet(local, skb); | |
4f95dd78 | 307 | return; |
17926a79 DH |
308 | } |
309 | ||
310 | /* | |
311 | * handle acceptance of a call by userspace | |
312 | * - assign the user call ID to the call at the front of the queue | |
313 | */ | |
651350d1 DH |
314 | struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx, |
315 | unsigned long user_call_ID) | |
17926a79 DH |
316 | { |
317 | struct rxrpc_call *call; | |
318 | struct rb_node *parent, **pp; | |
319 | int ret; | |
320 | ||
321 | _enter(",%lx", user_call_ID); | |
322 | ||
323 | ASSERT(!irqs_disabled()); | |
324 | ||
325 | write_lock(&rx->call_lock); | |
326 | ||
327 | ret = -ENODATA; | |
328 | if (list_empty(&rx->acceptq)) | |
329 | goto out; | |
330 | ||
331 | /* check the user ID isn't already in use */ | |
332 | ret = -EBADSLT; | |
333 | pp = &rx->calls.rb_node; | |
334 | parent = NULL; | |
335 | while (*pp) { | |
336 | parent = *pp; | |
337 | call = rb_entry(parent, struct rxrpc_call, sock_node); | |
338 | ||
339 | if (user_call_ID < call->user_call_ID) | |
340 | pp = &(*pp)->rb_left; | |
341 | else if (user_call_ID > call->user_call_ID) | |
342 | pp = &(*pp)->rb_right; | |
343 | else | |
344 | goto out; | |
345 | } | |
346 | ||
347 | /* dequeue the first call and check it's still valid */ | |
348 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); | |
349 | list_del_init(&call->accept_link); | |
350 | sk_acceptq_removed(&rx->sk); | |
351 | ||
352 | write_lock_bh(&call->state_lock); | |
353 | switch (call->state) { | |
354 | case RXRPC_CALL_SERVER_ACCEPTING: | |
355 | call->state = RXRPC_CALL_SERVER_RECV_REQUEST; | |
356 | break; | |
357 | case RXRPC_CALL_REMOTELY_ABORTED: | |
358 | case RXRPC_CALL_LOCALLY_ABORTED: | |
359 | ret = -ECONNABORTED; | |
360 | goto out_release; | |
361 | case RXRPC_CALL_NETWORK_ERROR: | |
362 | ret = call->conn->error; | |
363 | goto out_release; | |
364 | case RXRPC_CALL_DEAD: | |
365 | ret = -ETIME; | |
366 | goto out_discard; | |
367 | default: | |
368 | BUG(); | |
369 | } | |
370 | ||
371 | /* formalise the acceptance */ | |
372 | call->user_call_ID = user_call_ID; | |
373 | rb_link_node(&call->sock_node, parent, pp); | |
374 | rb_insert_color(&call->sock_node, &rx->calls); | |
375 | if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags)) | |
376 | BUG(); | |
4c198ad1 | 377 | if (test_and_set_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) |
17926a79 | 378 | BUG(); |
651350d1 | 379 | rxrpc_queue_call(call); |
17926a79 | 380 | |
651350d1 | 381 | rxrpc_get_call(call); |
17926a79 DH |
382 | write_unlock_bh(&call->state_lock); |
383 | write_unlock(&rx->call_lock); | |
651350d1 DH |
384 | _leave(" = %p{%d}", call, call->debug_id); |
385 | return call; | |
386 | ||
387 | /* if the call is already dying or dead, then we leave the socket's ref | |
388 | * on it to be released by rxrpc_dead_call_expired() as induced by | |
389 | * rxrpc_release_call() */ | |
390 | out_release: | |
391 | _debug("release %p", call); | |
392 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 393 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 DH |
394 | rxrpc_queue_call(call); |
395 | out_discard: | |
396 | write_unlock_bh(&call->state_lock); | |
397 | _debug("discard %p", call); | |
398 | out: | |
399 | write_unlock(&rx->call_lock); | |
400 | _leave(" = %d", ret); | |
401 | return ERR_PTR(ret); | |
402 | } | |
403 | ||
404 | /* | |
b4f1342f | 405 | * Handle rejection of a call by userspace |
651350d1 DH |
406 | * - reject the call at the front of the queue |
407 | */ | |
408 | int rxrpc_reject_call(struct rxrpc_sock *rx) | |
409 | { | |
410 | struct rxrpc_call *call; | |
411 | int ret; | |
412 | ||
413 | _enter(""); | |
414 | ||
415 | ASSERT(!irqs_disabled()); | |
416 | ||
417 | write_lock(&rx->call_lock); | |
418 | ||
419 | ret = -ENODATA; | |
420 | if (list_empty(&rx->acceptq)) | |
421 | goto out; | |
422 | ||
423 | /* dequeue the first call and check it's still valid */ | |
424 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); | |
425 | list_del_init(&call->accept_link); | |
426 | sk_acceptq_removed(&rx->sk); | |
427 | ||
428 | write_lock_bh(&call->state_lock); | |
429 | switch (call->state) { | |
430 | case RXRPC_CALL_SERVER_ACCEPTING: | |
431 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 432 | if (test_and_set_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) |
651350d1 DH |
433 | rxrpc_queue_call(call); |
434 | ret = 0; | |
435 | goto out_release; | |
436 | case RXRPC_CALL_REMOTELY_ABORTED: | |
437 | case RXRPC_CALL_LOCALLY_ABORTED: | |
438 | ret = -ECONNABORTED; | |
439 | goto out_release; | |
440 | case RXRPC_CALL_NETWORK_ERROR: | |
441 | ret = call->conn->error; | |
442 | goto out_release; | |
443 | case RXRPC_CALL_DEAD: | |
444 | ret = -ETIME; | |
445 | goto out_discard; | |
446 | default: | |
447 | BUG(); | |
448 | } | |
17926a79 DH |
449 | |
450 | /* if the call is already dying or dead, then we leave the socket's ref | |
451 | * on it to be released by rxrpc_dead_call_expired() as induced by | |
452 | * rxrpc_release_call() */ | |
453 | out_release: | |
454 | _debug("release %p", call); | |
455 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 456 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 | 457 | rxrpc_queue_call(call); |
17926a79 DH |
458 | out_discard: |
459 | write_unlock_bh(&call->state_lock); | |
460 | _debug("discard %p", call); | |
461 | out: | |
462 | write_unlock(&rx->call_lock); | |
463 | _leave(" = %d", ret); | |
464 | return ret; | |
465 | } | |
651350d1 DH |
466 | |
467 | /** | |
468 | * rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call | |
469 | * @sock: The socket on which the impending call is waiting | |
470 | * @user_call_ID: The tag to attach to the call | |
471 | * | |
472 | * Allow a kernel service to accept an incoming call, assuming the incoming | |
473 | * call is still valid. | |
474 | */ | |
475 | struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock, | |
476 | unsigned long user_call_ID) | |
477 | { | |
478 | struct rxrpc_call *call; | |
479 | ||
480 | _enter(",%lx", user_call_ID); | |
481 | call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID); | |
482 | _leave(" = %p", call); | |
483 | return call; | |
484 | } | |
651350d1 DH |
485 | EXPORT_SYMBOL(rxrpc_kernel_accept_call); |
486 | ||
487 | /** | |
488 | * rxrpc_kernel_reject_call - Allow a kernel service to reject an incoming call | |
489 | * @sock: The socket on which the impending call is waiting | |
490 | * | |
491 | * Allow a kernel service to reject an incoming call with a BUSY message, | |
492 | * assuming the incoming call is still valid. | |
493 | */ | |
494 | int rxrpc_kernel_reject_call(struct socket *sock) | |
495 | { | |
496 | int ret; | |
497 | ||
498 | _enter(""); | |
499 | ret = rxrpc_reject_call(rxrpc_sk(sock->sk)); | |
500 | _leave(" = %d", ret); | |
501 | return ret; | |
502 | } | |
651350d1 | 503 | EXPORT_SYMBOL(rxrpc_kernel_reject_call); |