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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; | |
17926a79 | 77 | struct rxrpc_skb_priv *sp, *nsp; |
17926a79 DH |
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 | ||
d991b4a3 | 96 | conn = rxrpc_incoming_connection(local, srx, skb); |
17926a79 DH |
97 | if (IS_ERR(conn)) { |
98 | _debug("no conn"); | |
99 | ret = PTR_ERR(conn); | |
100 | goto error; | |
101 | } | |
102 | ||
42886ffe | 103 | call = rxrpc_incoming_call(rx, conn, skb); |
17926a79 DH |
104 | rxrpc_put_connection(conn); |
105 | if (IS_ERR(call)) { | |
106 | _debug("no call"); | |
107 | ret = PTR_ERR(call); | |
108 | goto error; | |
109 | } | |
110 | ||
111 | /* attach the call to the socket */ | |
112 | read_lock_bh(&local->services_lock); | |
113 | if (rx->sk.sk_state == RXRPC_CLOSE) | |
114 | goto invalid_service; | |
115 | ||
116 | write_lock(&rx->call_lock); | |
117 | if (!test_and_set_bit(RXRPC_CALL_INIT_ACCEPT, &call->flags)) { | |
118 | rxrpc_get_call(call); | |
119 | ||
120 | spin_lock(&call->conn->state_lock); | |
121 | if (sp->hdr.securityIndex > 0 && | |
bba304db | 122 | call->conn->state == RXRPC_CONN_SERVICE_UNSECURED) { |
17926a79 DH |
123 | _debug("await conn sec"); |
124 | list_add_tail(&call->accept_link, &rx->secureq); | |
bba304db | 125 | call->conn->state = RXRPC_CONN_SERVICE_CHALLENGING; |
bba304db | 126 | set_bit(RXRPC_CONN_EV_CHALLENGE, &call->conn->events); |
651350d1 | 127 | rxrpc_queue_conn(call->conn); |
17926a79 DH |
128 | } else { |
129 | _debug("conn ready"); | |
130 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
131 | list_add_tail(&call->accept_link, &rx->acceptq); | |
e34d4234 | 132 | rxrpc_get_call_for_skb(call, notification); |
17926a79 DH |
133 | nsp = rxrpc_skb(notification); |
134 | nsp->call = call; | |
135 | ||
136 | ASSERTCMP(atomic_read(&call->usage), >=, 3); | |
137 | ||
138 | _debug("notify"); | |
139 | spin_lock(&call->lock); | |
140 | ret = rxrpc_queue_rcv_skb(call, notification, true, | |
141 | false); | |
142 | spin_unlock(&call->lock); | |
143 | notification = NULL; | |
163e3cb7 | 144 | BUG_ON(ret < 0); |
17926a79 DH |
145 | } |
146 | spin_unlock(&call->conn->state_lock); | |
147 | ||
148 | _debug("queued"); | |
149 | } | |
150 | write_unlock(&rx->call_lock); | |
151 | ||
152 | _debug("process"); | |
153 | rxrpc_fast_process_packet(call, skb); | |
154 | ||
155 | _debug("done"); | |
156 | read_unlock_bh(&local->services_lock); | |
157 | rxrpc_free_skb(notification); | |
158 | rxrpc_put_call(call); | |
159 | _leave(" = 0"); | |
160 | return 0; | |
161 | ||
162 | invalid_service: | |
163 | _debug("invalid"); | |
164 | read_unlock_bh(&local->services_lock); | |
165 | ||
166 | read_lock_bh(&call->state_lock); | |
e721498a | 167 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && |
4c198ad1 | 168 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 | 169 | rxrpc_get_call(call); |
651350d1 | 170 | rxrpc_queue_call(call); |
17926a79 DH |
171 | } |
172 | read_unlock_bh(&call->state_lock); | |
173 | rxrpc_put_call(call); | |
174 | ret = -ECONNREFUSED; | |
175 | error: | |
176 | rxrpc_free_skb(notification); | |
c3824d21 | 177 | error_nofree: |
17926a79 DH |
178 | _leave(" = %d", ret); |
179 | return ret; | |
180 | } | |
181 | ||
182 | /* | |
183 | * accept incoming calls that need peer, transport and/or connection setting up | |
184 | * - the packets we get are all incoming client DATA packets that have seq == 1 | |
185 | */ | |
4f95dd78 | 186 | void rxrpc_accept_incoming_calls(struct rxrpc_local *local) |
17926a79 | 187 | { |
17926a79 DH |
188 | struct rxrpc_skb_priv *sp; |
189 | struct sockaddr_rxrpc srx; | |
190 | struct rxrpc_sock *rx; | |
0d12f8a4 | 191 | struct rxrpc_wire_header whdr; |
17926a79 | 192 | struct sk_buff *skb; |
17926a79 DH |
193 | int ret; |
194 | ||
195 | _enter("%d", local->debug_id); | |
196 | ||
17926a79 DH |
197 | skb = skb_dequeue(&local->accept_queue); |
198 | if (!skb) { | |
17926a79 DH |
199 | _leave("\n"); |
200 | return; | |
201 | } | |
202 | ||
203 | _net("incoming call skb %p", skb); | |
204 | ||
df844fd4 | 205 | rxrpc_see_skb(skb); |
17926a79 DH |
206 | sp = rxrpc_skb(skb); |
207 | ||
0d12f8a4 DH |
208 | /* Set up a response packet header in case we need it */ |
209 | whdr.epoch = htonl(sp->hdr.epoch); | |
210 | whdr.cid = htonl(sp->hdr.cid); | |
211 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
212 | whdr.seq = htonl(sp->hdr.seq); | |
213 | whdr.serial = 0; | |
214 | whdr.flags = 0; | |
215 | whdr.type = 0; | |
216 | whdr.userStatus = 0; | |
217 | whdr.securityIndex = sp->hdr.securityIndex; | |
218 | whdr._rsvd = 0; | |
219 | whdr.serviceId = htons(sp->hdr.serviceId); | |
220 | ||
d991b4a3 DH |
221 | if (rxrpc_extract_addr_from_skb(&srx, skb) < 0) |
222 | goto drop; | |
17926a79 DH |
223 | |
224 | /* get the socket providing the service */ | |
17926a79 DH |
225 | read_lock_bh(&local->services_lock); |
226 | list_for_each_entry(rx, &local->services, listen_link) { | |
0d12f8a4 | 227 | if (rx->srx.srx_service == sp->hdr.serviceId && |
17926a79 DH |
228 | rx->sk.sk_state != RXRPC_CLOSE) |
229 | goto found_service; | |
230 | } | |
231 | read_unlock_bh(&local->services_lock); | |
232 | goto invalid_service; | |
233 | ||
234 | found_service: | |
0d12f8a4 | 235 | _debug("found service %hd", rx->srx.srx_service); |
17926a79 DH |
236 | if (sk_acceptq_is_full(&rx->sk)) |
237 | goto backlog_full; | |
238 | sk_acceptq_added(&rx->sk); | |
239 | sock_hold(&rx->sk); | |
240 | read_unlock_bh(&local->services_lock); | |
241 | ||
242 | ret = rxrpc_accept_incoming_call(local, rx, skb, &srx); | |
243 | if (ret < 0) | |
244 | sk_acceptq_removed(&rx->sk); | |
245 | sock_put(&rx->sk); | |
246 | switch (ret) { | |
247 | case -ECONNRESET: /* old calls are ignored */ | |
248 | case -ECONNABORTED: /* aborted calls are reaborted or ignored */ | |
249 | case 0: | |
4f95dd78 | 250 | return; |
17926a79 DH |
251 | case -ECONNREFUSED: |
252 | goto invalid_service; | |
253 | case -EBUSY: | |
254 | goto busy; | |
255 | case -EKEYREJECTED: | |
256 | goto security_mismatch; | |
257 | default: | |
258 | BUG(); | |
259 | } | |
260 | ||
261 | backlog_full: | |
262 | read_unlock_bh(&local->services_lock); | |
263 | busy: | |
0d12f8a4 | 264 | rxrpc_busy(local, &srx, &whdr); |
17926a79 | 265 | rxrpc_free_skb(skb); |
4f95dd78 | 266 | return; |
17926a79 | 267 | |
d991b4a3 DH |
268 | drop: |
269 | rxrpc_free_skb(skb); | |
270 | return; | |
271 | ||
17926a79 DH |
272 | invalid_service: |
273 | skb->priority = RX_INVALID_OPERATION; | |
274 | rxrpc_reject_packet(local, skb); | |
4f95dd78 | 275 | return; |
17926a79 DH |
276 | |
277 | /* can't change connection security type mid-flow */ | |
278 | security_mismatch: | |
279 | skb->priority = RX_PROTOCOL_ERROR; | |
280 | rxrpc_reject_packet(local, skb); | |
4f95dd78 | 281 | return; |
17926a79 DH |
282 | } |
283 | ||
284 | /* | |
285 | * handle acceptance of a call by userspace | |
286 | * - assign the user call ID to the call at the front of the queue | |
287 | */ | |
651350d1 DH |
288 | struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx, |
289 | unsigned long user_call_ID) | |
17926a79 DH |
290 | { |
291 | struct rxrpc_call *call; | |
292 | struct rb_node *parent, **pp; | |
293 | int ret; | |
294 | ||
295 | _enter(",%lx", user_call_ID); | |
296 | ||
297 | ASSERT(!irqs_disabled()); | |
298 | ||
299 | write_lock(&rx->call_lock); | |
300 | ||
301 | ret = -ENODATA; | |
302 | if (list_empty(&rx->acceptq)) | |
303 | goto out; | |
304 | ||
305 | /* check the user ID isn't already in use */ | |
306 | ret = -EBADSLT; | |
307 | pp = &rx->calls.rb_node; | |
308 | parent = NULL; | |
309 | while (*pp) { | |
310 | parent = *pp; | |
311 | call = rb_entry(parent, struct rxrpc_call, sock_node); | |
312 | ||
313 | if (user_call_ID < call->user_call_ID) | |
314 | pp = &(*pp)->rb_left; | |
315 | else if (user_call_ID > call->user_call_ID) | |
316 | pp = &(*pp)->rb_right; | |
317 | else | |
318 | goto out; | |
319 | } | |
320 | ||
321 | /* dequeue the first call and check it's still valid */ | |
322 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); | |
323 | list_del_init(&call->accept_link); | |
324 | sk_acceptq_removed(&rx->sk); | |
e34d4234 | 325 | rxrpc_see_call(call); |
17926a79 DH |
326 | |
327 | write_lock_bh(&call->state_lock); | |
328 | switch (call->state) { | |
329 | case RXRPC_CALL_SERVER_ACCEPTING: | |
330 | call->state = RXRPC_CALL_SERVER_RECV_REQUEST; | |
331 | break; | |
f5c17aae DH |
332 | case RXRPC_CALL_COMPLETE: |
333 | ret = call->error; | |
17926a79 DH |
334 | goto out_release; |
335 | case RXRPC_CALL_DEAD: | |
336 | ret = -ETIME; | |
337 | goto out_discard; | |
338 | default: | |
339 | BUG(); | |
340 | } | |
341 | ||
342 | /* formalise the acceptance */ | |
343 | call->user_call_ID = user_call_ID; | |
344 | rb_link_node(&call->sock_node, parent, pp); | |
345 | rb_insert_color(&call->sock_node, &rx->calls); | |
346 | if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags)) | |
347 | BUG(); | |
4c198ad1 | 348 | if (test_and_set_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) |
17926a79 | 349 | BUG(); |
651350d1 | 350 | rxrpc_queue_call(call); |
17926a79 | 351 | |
651350d1 | 352 | rxrpc_get_call(call); |
17926a79 DH |
353 | write_unlock_bh(&call->state_lock); |
354 | write_unlock(&rx->call_lock); | |
651350d1 DH |
355 | _leave(" = %p{%d}", call, call->debug_id); |
356 | return call; | |
357 | ||
358 | /* if the call is already dying or dead, then we leave the socket's ref | |
359 | * on it to be released by rxrpc_dead_call_expired() as induced by | |
360 | * rxrpc_release_call() */ | |
361 | out_release: | |
362 | _debug("release %p", call); | |
363 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 364 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 DH |
365 | rxrpc_queue_call(call); |
366 | out_discard: | |
367 | write_unlock_bh(&call->state_lock); | |
368 | _debug("discard %p", call); | |
369 | out: | |
370 | write_unlock(&rx->call_lock); | |
371 | _leave(" = %d", ret); | |
372 | return ERR_PTR(ret); | |
373 | } | |
374 | ||
375 | /* | |
b4f1342f | 376 | * Handle rejection of a call by userspace |
651350d1 DH |
377 | * - reject the call at the front of the queue |
378 | */ | |
379 | int rxrpc_reject_call(struct rxrpc_sock *rx) | |
380 | { | |
381 | struct rxrpc_call *call; | |
382 | int ret; | |
383 | ||
384 | _enter(""); | |
385 | ||
386 | ASSERT(!irqs_disabled()); | |
387 | ||
388 | write_lock(&rx->call_lock); | |
389 | ||
390 | ret = -ENODATA; | |
391 | if (list_empty(&rx->acceptq)) | |
392 | goto out; | |
393 | ||
394 | /* dequeue the first call and check it's still valid */ | |
395 | call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link); | |
396 | list_del_init(&call->accept_link); | |
397 | sk_acceptq_removed(&rx->sk); | |
e34d4234 | 398 | rxrpc_see_call(call); |
651350d1 DH |
399 | |
400 | write_lock_bh(&call->state_lock); | |
401 | switch (call->state) { | |
402 | case RXRPC_CALL_SERVER_ACCEPTING: | |
f5c17aae DH |
403 | __rxrpc_set_call_completion(call, RXRPC_CALL_SERVER_BUSY, |
404 | 0, ECONNABORTED); | |
4c198ad1 | 405 | if (test_and_set_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) |
651350d1 DH |
406 | rxrpc_queue_call(call); |
407 | ret = 0; | |
408 | goto out_release; | |
f5c17aae DH |
409 | case RXRPC_CALL_COMPLETE: |
410 | ret = call->error; | |
651350d1 DH |
411 | goto out_release; |
412 | case RXRPC_CALL_DEAD: | |
413 | ret = -ETIME; | |
414 | goto out_discard; | |
415 | default: | |
416 | BUG(); | |
417 | } | |
17926a79 DH |
418 | |
419 | /* if the call is already dying or dead, then we leave the socket's ref | |
420 | * on it to be released by rxrpc_dead_call_expired() as induced by | |
421 | * rxrpc_release_call() */ | |
422 | out_release: | |
423 | _debug("release %p", call); | |
424 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 425 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 | 426 | rxrpc_queue_call(call); |
17926a79 DH |
427 | out_discard: |
428 | write_unlock_bh(&call->state_lock); | |
429 | _debug("discard %p", call); | |
430 | out: | |
431 | write_unlock(&rx->call_lock); | |
432 | _leave(" = %d", ret); | |
433 | return ret; | |
434 | } | |
651350d1 DH |
435 | |
436 | /** | |
437 | * rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call | |
438 | * @sock: The socket on which the impending call is waiting | |
439 | * @user_call_ID: The tag to attach to the call | |
440 | * | |
441 | * Allow a kernel service to accept an incoming call, assuming the incoming | |
442 | * call is still valid. | |
443 | */ | |
444 | struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock, | |
445 | unsigned long user_call_ID) | |
446 | { | |
447 | struct rxrpc_call *call; | |
448 | ||
449 | _enter(",%lx", user_call_ID); | |
450 | call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID); | |
451 | _leave(" = %p", call); | |
452 | return call; | |
453 | } | |
651350d1 DH |
454 | EXPORT_SYMBOL(rxrpc_kernel_accept_call); |
455 | ||
456 | /** | |
457 | * rxrpc_kernel_reject_call - Allow a kernel service to reject an incoming call | |
458 | * @sock: The socket on which the impending call is waiting | |
459 | * | |
460 | * Allow a kernel service to reject an incoming call with a BUSY message, | |
461 | * assuming the incoming call is still valid. | |
462 | */ | |
463 | int rxrpc_kernel_reject_call(struct socket *sock) | |
464 | { | |
465 | int ret; | |
466 | ||
467 | _enter(""); | |
468 | ret = rxrpc_reject_call(rxrpc_sk(sock->sk)); | |
469 | _leave(" = %d", ret); | |
470 | return ret; | |
471 | } | |
651350d1 | 472 | EXPORT_SYMBOL(rxrpc_kernel_reject_call); |