]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* transport.c: Rx Transport routines |
2 | * | |
3 | * Copyright (C) 2002 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 | ||
1da177e4 LT |
12 | #include <linux/slab.h> |
13 | #include <linux/module.h> | |
14 | #include <rxrpc/transport.h> | |
15 | #include <rxrpc/peer.h> | |
16 | #include <rxrpc/connection.h> | |
17 | #include <rxrpc/call.h> | |
18 | #include <rxrpc/message.h> | |
19 | #include <rxrpc/krxiod.h> | |
20 | #include <rxrpc/krxsecd.h> | |
21 | #include <linux/udp.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/in6.h> | |
24 | #include <linux/icmp.h> | |
fb286bb2 | 25 | #include <linux/skbuff.h> |
1da177e4 LT |
26 | #include <net/sock.h> |
27 | #include <net/ip.h> | |
28 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
29 | #include <linux/ipv6.h> /* this should _really_ be in errqueue.h.. */ | |
30 | #endif | |
31 | #include <linux/errqueue.h> | |
32 | #include <asm/uaccess.h> | |
1da177e4 LT |
33 | #include "internal.h" |
34 | ||
35 | struct errormsg { | |
36 | struct cmsghdr cmsg; /* control message header */ | |
37 | struct sock_extended_err ee; /* extended error information */ | |
38 | struct sockaddr_in icmp_src; /* ICMP packet source address */ | |
39 | }; | |
40 | ||
41 | static DEFINE_SPINLOCK(rxrpc_transports_lock); | |
42 | static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports); | |
43 | ||
44 | __RXACCT_DECL(atomic_t rxrpc_transport_count); | |
45 | LIST_HEAD(rxrpc_proc_transports); | |
46 | DECLARE_RWSEM(rxrpc_proc_transports_sem); | |
47 | ||
48 | static void rxrpc_data_ready(struct sock *sk, int count); | |
49 | static void rxrpc_error_report(struct sock *sk); | |
50 | static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans, | |
51 | struct list_head *msgq); | |
52 | static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans); | |
53 | ||
54 | /*****************************************************************************/ | |
55 | /* | |
56 | * create a new transport endpoint using the specified UDP port | |
57 | */ | |
58 | int rxrpc_create_transport(unsigned short port, | |
59 | struct rxrpc_transport **_trans) | |
60 | { | |
61 | struct rxrpc_transport *trans; | |
62 | struct sockaddr_in sin; | |
63 | mm_segment_t oldfs; | |
64 | struct sock *sock; | |
65 | int ret, opt; | |
66 | ||
67 | _enter("%hu", port); | |
68 | ||
0da974f4 | 69 | trans = kzalloc(sizeof(struct rxrpc_transport), GFP_KERNEL); |
1da177e4 LT |
70 | if (!trans) |
71 | return -ENOMEM; | |
72 | ||
1da177e4 LT |
73 | atomic_set(&trans->usage, 1); |
74 | INIT_LIST_HEAD(&trans->services); | |
75 | INIT_LIST_HEAD(&trans->link); | |
76 | INIT_LIST_HEAD(&trans->krxiodq_link); | |
77 | spin_lock_init(&trans->lock); | |
78 | INIT_LIST_HEAD(&trans->peer_active); | |
79 | INIT_LIST_HEAD(&trans->peer_graveyard); | |
80 | spin_lock_init(&trans->peer_gylock); | |
81 | init_waitqueue_head(&trans->peer_gy_waitq); | |
82 | rwlock_init(&trans->peer_lock); | |
83 | atomic_set(&trans->peer_count, 0); | |
84 | trans->port = port; | |
85 | ||
86 | /* create a UDP socket to be my actual transport endpoint */ | |
87 | ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket); | |
88 | if (ret < 0) | |
89 | goto error; | |
90 | ||
91 | /* use the specified port */ | |
92 | if (port) { | |
93 | memset(&sin, 0, sizeof(sin)); | |
94 | sin.sin_family = AF_INET; | |
95 | sin.sin_port = htons(port); | |
96 | ret = trans->socket->ops->bind(trans->socket, | |
97 | (struct sockaddr *) &sin, | |
98 | sizeof(sin)); | |
99 | if (ret < 0) | |
100 | goto error; | |
101 | } | |
102 | ||
103 | opt = 1; | |
104 | oldfs = get_fs(); | |
105 | set_fs(KERNEL_DS); | |
106 | ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR, | |
107 | (char *) &opt, sizeof(opt)); | |
108 | set_fs(oldfs); | |
109 | ||
110 | spin_lock(&rxrpc_transports_lock); | |
111 | list_add(&trans->link, &rxrpc_transports); | |
112 | spin_unlock(&rxrpc_transports_lock); | |
113 | ||
114 | /* set the socket up */ | |
115 | sock = trans->socket->sk; | |
116 | sock->sk_user_data = trans; | |
117 | sock->sk_data_ready = rxrpc_data_ready; | |
118 | sock->sk_error_report = rxrpc_error_report; | |
119 | ||
120 | down_write(&rxrpc_proc_transports_sem); | |
121 | list_add_tail(&trans->proc_link, &rxrpc_proc_transports); | |
122 | up_write(&rxrpc_proc_transports_sem); | |
123 | ||
124 | __RXACCT(atomic_inc(&rxrpc_transport_count)); | |
125 | ||
126 | *_trans = trans; | |
127 | _leave(" = 0 (%p)", trans); | |
128 | return 0; | |
129 | ||
130 | error: | |
131 | /* finish cleaning up the transport (not really needed here, but...) */ | |
132 | if (trans->socket) | |
133 | trans->socket->ops->shutdown(trans->socket, 2); | |
134 | ||
135 | /* close the socket */ | |
136 | if (trans->socket) { | |
137 | trans->socket->sk->sk_user_data = NULL; | |
138 | sock_release(trans->socket); | |
139 | trans->socket = NULL; | |
140 | } | |
141 | ||
142 | kfree(trans); | |
143 | ||
144 | ||
145 | _leave(" = %d", ret); | |
146 | return ret; | |
147 | } /* end rxrpc_create_transport() */ | |
148 | ||
149 | /*****************************************************************************/ | |
150 | /* | |
151 | * destroy a transport endpoint | |
152 | */ | |
153 | void rxrpc_put_transport(struct rxrpc_transport *trans) | |
154 | { | |
155 | _enter("%p{u=%d p=%hu}", | |
156 | trans, atomic_read(&trans->usage), trans->port); | |
157 | ||
158 | BUG_ON(atomic_read(&trans->usage) <= 0); | |
159 | ||
160 | /* to prevent a race, the decrement and the dequeue must be | |
161 | * effectively atomic */ | |
162 | spin_lock(&rxrpc_transports_lock); | |
163 | if (likely(!atomic_dec_and_test(&trans->usage))) { | |
164 | spin_unlock(&rxrpc_transports_lock); | |
165 | _leave(""); | |
166 | return; | |
167 | } | |
168 | ||
169 | list_del(&trans->link); | |
170 | spin_unlock(&rxrpc_transports_lock); | |
171 | ||
172 | /* finish cleaning up the transport */ | |
173 | if (trans->socket) | |
174 | trans->socket->ops->shutdown(trans->socket, 2); | |
175 | ||
176 | rxrpc_krxsecd_clear_transport(trans); | |
177 | rxrpc_krxiod_dequeue_transport(trans); | |
178 | ||
179 | /* discard all peer information */ | |
180 | rxrpc_peer_clearall(trans); | |
181 | ||
182 | down_write(&rxrpc_proc_transports_sem); | |
183 | list_del(&trans->proc_link); | |
184 | up_write(&rxrpc_proc_transports_sem); | |
185 | __RXACCT(atomic_dec(&rxrpc_transport_count)); | |
186 | ||
187 | /* close the socket */ | |
188 | if (trans->socket) { | |
189 | trans->socket->sk->sk_user_data = NULL; | |
190 | sock_release(trans->socket); | |
191 | trans->socket = NULL; | |
192 | } | |
193 | ||
194 | kfree(trans); | |
195 | ||
196 | _leave(""); | |
197 | } /* end rxrpc_put_transport() */ | |
198 | ||
199 | /*****************************************************************************/ | |
200 | /* | |
201 | * add a service to a transport to be listened upon | |
202 | */ | |
203 | int rxrpc_add_service(struct rxrpc_transport *trans, | |
204 | struct rxrpc_service *newsrv) | |
205 | { | |
206 | struct rxrpc_service *srv; | |
207 | struct list_head *_p; | |
208 | int ret = -EEXIST; | |
209 | ||
210 | _enter("%p{%hu},%p{%hu}", | |
211 | trans, trans->port, newsrv, newsrv->service_id); | |
212 | ||
213 | /* verify that the service ID is not already present */ | |
214 | spin_lock(&trans->lock); | |
215 | ||
216 | list_for_each(_p, &trans->services) { | |
217 | srv = list_entry(_p, struct rxrpc_service, link); | |
218 | if (srv->service_id == newsrv->service_id) | |
219 | goto out; | |
220 | } | |
221 | ||
222 | /* okay - add the transport to the list */ | |
223 | list_add_tail(&newsrv->link, &trans->services); | |
224 | rxrpc_get_transport(trans); | |
225 | ret = 0; | |
226 | ||
227 | out: | |
228 | spin_unlock(&trans->lock); | |
229 | ||
230 | _leave("= %d", ret); | |
231 | return ret; | |
232 | } /* end rxrpc_add_service() */ | |
233 | ||
234 | /*****************************************************************************/ | |
235 | /* | |
236 | * remove a service from a transport | |
237 | */ | |
238 | void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv) | |
239 | { | |
240 | _enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id); | |
241 | ||
242 | spin_lock(&trans->lock); | |
243 | list_del(&srv->link); | |
244 | spin_unlock(&trans->lock); | |
245 | ||
246 | rxrpc_put_transport(trans); | |
247 | ||
248 | _leave(""); | |
249 | } /* end rxrpc_del_service() */ | |
250 | ||
251 | /*****************************************************************************/ | |
252 | /* | |
253 | * INET callback when data has been received on the socket. | |
254 | */ | |
255 | static void rxrpc_data_ready(struct sock *sk, int count) | |
256 | { | |
257 | struct rxrpc_transport *trans; | |
258 | ||
259 | _enter("%p{t=%p},%d", sk, sk->sk_user_data, count); | |
260 | ||
261 | /* queue the transport for attention by krxiod */ | |
262 | trans = (struct rxrpc_transport *) sk->sk_user_data; | |
263 | if (trans) | |
264 | rxrpc_krxiod_queue_transport(trans); | |
265 | ||
266 | /* wake up anyone waiting on the socket */ | |
267 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
268 | wake_up_interruptible(sk->sk_sleep); | |
269 | ||
270 | _leave(""); | |
271 | } /* end rxrpc_data_ready() */ | |
272 | ||
273 | /*****************************************************************************/ | |
274 | /* | |
275 | * INET callback when an ICMP error packet is received | |
276 | * - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE) | |
277 | */ | |
278 | static void rxrpc_error_report(struct sock *sk) | |
279 | { | |
280 | struct rxrpc_transport *trans; | |
281 | ||
282 | _enter("%p{t=%p}", sk, sk->sk_user_data); | |
283 | ||
284 | /* queue the transport for attention by krxiod */ | |
285 | trans = (struct rxrpc_transport *) sk->sk_user_data; | |
286 | if (trans) { | |
287 | trans->error_rcvd = 1; | |
288 | rxrpc_krxiod_queue_transport(trans); | |
289 | } | |
290 | ||
291 | /* wake up anyone waiting on the socket */ | |
292 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
293 | wake_up_interruptible(sk->sk_sleep); | |
294 | ||
295 | _leave(""); | |
296 | } /* end rxrpc_error_report() */ | |
297 | ||
298 | /*****************************************************************************/ | |
299 | /* | |
300 | * split a message up, allocating message records and filling them in | |
301 | * from the contents of a socket buffer | |
302 | */ | |
303 | static int rxrpc_incoming_msg(struct rxrpc_transport *trans, | |
304 | struct sk_buff *pkt, | |
305 | struct list_head *msgq) | |
306 | { | |
307 | struct rxrpc_message *msg; | |
308 | int ret; | |
309 | ||
310 | _enter(""); | |
311 | ||
0da974f4 | 312 | msg = kzalloc(sizeof(struct rxrpc_message), GFP_KERNEL); |
1da177e4 LT |
313 | if (!msg) { |
314 | _leave(" = -ENOMEM"); | |
315 | return -ENOMEM; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | atomic_set(&msg->usage, 1); |
319 | list_add_tail(&msg->link,msgq); | |
320 | ||
321 | /* dig out the Rx routing parameters */ | |
322 | if (skb_copy_bits(pkt, sizeof(struct udphdr), | |
323 | &msg->hdr, sizeof(msg->hdr)) < 0) { | |
324 | ret = -EBADMSG; | |
325 | goto error; | |
326 | } | |
327 | ||
328 | msg->trans = trans; | |
329 | msg->state = RXRPC_MSG_RECEIVED; | |
9deff7f2 | 330 | skb_get_timestamp(pkt, &msg->stamp); |
1da177e4 | 331 | if (msg->stamp.tv_sec == 0) { |
7612713f YH |
332 | do_gettimeofday(&msg->stamp); |
333 | if (pkt->sk) | |
1da177e4 | 334 | sock_enable_timestamp(pkt->sk); |
7612713f | 335 | } |
1da177e4 LT |
336 | msg->seq = ntohl(msg->hdr.seq); |
337 | ||
338 | /* attach the packet */ | |
339 | skb_get(pkt); | |
340 | msg->pkt = pkt; | |
341 | ||
342 | msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header); | |
343 | msg->dsize = msg->pkt->len - msg->offset; | |
344 | ||
345 | _net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)", | |
346 | msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server", | |
347 | ntohl(msg->hdr.epoch), | |
348 | (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT, | |
349 | ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK, | |
350 | ntohl(msg->hdr.callNumber), | |
351 | rxrpc_pkts[msg->hdr.type], | |
352 | msg->hdr.flags, | |
353 | ntohs(msg->hdr.serviceId), | |
354 | msg->hdr.securityIndex); | |
355 | ||
356 | __RXACCT(atomic_inc(&rxrpc_message_count)); | |
357 | ||
358 | /* split off jumbo packets */ | |
359 | while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
360 | msg->hdr.flags & RXRPC_JUMBO_PACKET | |
361 | ) { | |
362 | struct rxrpc_jumbo_header jumbo; | |
363 | struct rxrpc_message *jumbomsg = msg; | |
364 | ||
365 | _debug("split jumbo packet"); | |
366 | ||
367 | /* quick sanity check */ | |
368 | ret = -EBADMSG; | |
369 | if (msg->dsize < | |
370 | RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header)) | |
371 | goto error; | |
372 | if (msg->hdr.flags & RXRPC_LAST_PACKET) | |
373 | goto error; | |
374 | ||
375 | /* dig out the secondary header */ | |
376 | if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN, | |
377 | &jumbo, sizeof(jumbo)) < 0) | |
378 | goto error; | |
379 | ||
380 | /* allocate a new message record */ | |
381 | ret = -ENOMEM; | |
52978be6 | 382 | msg = kmemdup(jumbomsg, sizeof(struct rxrpc_message), GFP_KERNEL); |
1da177e4 LT |
383 | if (!msg) |
384 | goto error; | |
385 | ||
1da177e4 LT |
386 | list_add_tail(&msg->link, msgq); |
387 | ||
388 | /* adjust the jumbo packet */ | |
389 | jumbomsg->dsize = RXRPC_JUMBO_DATALEN; | |
390 | ||
391 | /* attach the packet here too */ | |
392 | skb_get(pkt); | |
393 | ||
394 | /* adjust the parameters */ | |
395 | msg->seq++; | |
396 | msg->hdr.seq = htonl(msg->seq); | |
397 | msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1); | |
398 | msg->offset += RXRPC_JUMBO_DATALEN + | |
399 | sizeof(struct rxrpc_jumbo_header); | |
400 | msg->dsize -= RXRPC_JUMBO_DATALEN + | |
401 | sizeof(struct rxrpc_jumbo_header); | |
402 | msg->hdr.flags = jumbo.flags; | |
403 | msg->hdr._rsvd = jumbo._rsvd; | |
404 | ||
405 | _net("Rx Split jumbo packet from %s" | |
406 | " (%08x;%08x,%1x,%d,%s,%02x,%d,%d)", | |
407 | msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server", | |
408 | ntohl(msg->hdr.epoch), | |
409 | (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT, | |
410 | ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK, | |
411 | ntohl(msg->hdr.callNumber), | |
412 | rxrpc_pkts[msg->hdr.type], | |
413 | msg->hdr.flags, | |
414 | ntohs(msg->hdr.serviceId), | |
415 | msg->hdr.securityIndex); | |
416 | ||
417 | __RXACCT(atomic_inc(&rxrpc_message_count)); | |
418 | } | |
419 | ||
420 | _leave(" = 0 #%d", atomic_read(&rxrpc_message_count)); | |
421 | return 0; | |
422 | ||
423 | error: | |
424 | while (!list_empty(msgq)) { | |
425 | msg = list_entry(msgq->next, struct rxrpc_message, link); | |
426 | list_del_init(&msg->link); | |
427 | ||
428 | rxrpc_put_message(msg); | |
429 | } | |
430 | ||
431 | _leave(" = %d", ret); | |
432 | return ret; | |
433 | } /* end rxrpc_incoming_msg() */ | |
434 | ||
435 | /*****************************************************************************/ | |
436 | /* | |
437 | * accept a new call | |
438 | * - called from krxiod in process context | |
439 | */ | |
440 | void rxrpc_trans_receive_packet(struct rxrpc_transport *trans) | |
441 | { | |
442 | struct rxrpc_message *msg; | |
443 | struct rxrpc_peer *peer; | |
444 | struct sk_buff *pkt; | |
445 | int ret; | |
446 | __be32 addr; | |
447 | __be16 port; | |
448 | ||
449 | LIST_HEAD(msgq); | |
450 | ||
451 | _enter("%p{%d}", trans, trans->port); | |
452 | ||
453 | for (;;) { | |
454 | /* deal with outstanting errors first */ | |
455 | if (trans->error_rcvd) | |
456 | rxrpc_trans_receive_error_report(trans); | |
457 | ||
458 | /* attempt to receive a packet */ | |
459 | pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret); | |
460 | if (!pkt) { | |
461 | if (ret == -EAGAIN) { | |
462 | _leave(" EAGAIN"); | |
463 | return; | |
464 | } | |
465 | ||
466 | /* an icmp error may have occurred */ | |
467 | rxrpc_krxiod_queue_transport(trans); | |
468 | _leave(" error %d\n", ret); | |
469 | return; | |
470 | } | |
471 | ||
472 | /* we'll probably need to checksum it (didn't call | |
473 | * sock_recvmsg) */ | |
fb286bb2 HX |
474 | if (skb_checksum_complete(pkt)) { |
475 | kfree_skb(pkt); | |
476 | rxrpc_krxiod_queue_transport(trans); | |
477 | _leave(" CSUM failed"); | |
478 | return; | |
1da177e4 LT |
479 | } |
480 | ||
eddc9ec5 | 481 | addr = ip_hdr(pkt)->saddr; |
1da177e4 LT |
482 | port = pkt->h.uh->source; |
483 | ||
484 | _net("Rx Received UDP packet from %08x:%04hu", | |
485 | ntohl(addr), ntohs(port)); | |
486 | ||
487 | /* unmarshall the Rx parameters and split jumbo packets */ | |
488 | ret = rxrpc_incoming_msg(trans, pkt, &msgq); | |
489 | if (ret < 0) { | |
490 | kfree_skb(pkt); | |
491 | rxrpc_krxiod_queue_transport(trans); | |
492 | _leave(" bad packet"); | |
493 | return; | |
494 | } | |
495 | ||
496 | BUG_ON(list_empty(&msgq)); | |
497 | ||
498 | msg = list_entry(msgq.next, struct rxrpc_message, link); | |
499 | ||
500 | /* locate the record for the peer from which it | |
501 | * originated */ | |
502 | ret = rxrpc_peer_lookup(trans, addr, &peer); | |
503 | if (ret < 0) { | |
504 | kdebug("Rx No connections from that peer"); | |
505 | rxrpc_trans_immediate_abort(trans, msg, -EINVAL); | |
506 | goto finished_msg; | |
507 | } | |
508 | ||
509 | /* try and find a matching connection */ | |
510 | ret = rxrpc_connection_lookup(peer, msg, &msg->conn); | |
511 | if (ret < 0) { | |
512 | kdebug("Rx Unknown Connection"); | |
513 | rxrpc_trans_immediate_abort(trans, msg, -EINVAL); | |
514 | rxrpc_put_peer(peer); | |
515 | goto finished_msg; | |
516 | } | |
517 | rxrpc_put_peer(peer); | |
518 | ||
519 | /* deal with the first packet of a new call */ | |
520 | if (msg->hdr.flags & RXRPC_CLIENT_INITIATED && | |
521 | msg->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
522 | ntohl(msg->hdr.seq) == 1 | |
523 | ) { | |
524 | _debug("Rx New server call"); | |
525 | rxrpc_trans_receive_new_call(trans, &msgq); | |
526 | goto finished_msg; | |
527 | } | |
528 | ||
529 | /* deal with subsequent packet(s) of call */ | |
530 | _debug("Rx Call packet"); | |
531 | while (!list_empty(&msgq)) { | |
532 | msg = list_entry(msgq.next, struct rxrpc_message, link); | |
533 | list_del_init(&msg->link); | |
534 | ||
535 | ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg); | |
536 | if (ret < 0) { | |
537 | rxrpc_trans_immediate_abort(trans, msg, ret); | |
538 | rxrpc_put_message(msg); | |
539 | goto finished_msg; | |
540 | } | |
541 | ||
542 | rxrpc_put_message(msg); | |
543 | } | |
544 | ||
545 | goto finished_msg; | |
546 | ||
547 | /* dispose of the packets */ | |
548 | finished_msg: | |
549 | while (!list_empty(&msgq)) { | |
550 | msg = list_entry(msgq.next, struct rxrpc_message, link); | |
551 | list_del_init(&msg->link); | |
552 | ||
553 | rxrpc_put_message(msg); | |
554 | } | |
555 | kfree_skb(pkt); | |
556 | } | |
557 | ||
558 | _leave(""); | |
559 | ||
560 | } /* end rxrpc_trans_receive_packet() */ | |
561 | ||
562 | /*****************************************************************************/ | |
563 | /* | |
564 | * accept a new call from a client trying to connect to one of my services | |
565 | * - called in process context | |
566 | */ | |
567 | static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans, | |
568 | struct list_head *msgq) | |
569 | { | |
570 | struct rxrpc_message *msg; | |
571 | ||
572 | _enter(""); | |
573 | ||
574 | /* only bother with the first packet */ | |
575 | msg = list_entry(msgq->next, struct rxrpc_message, link); | |
576 | list_del_init(&msg->link); | |
577 | rxrpc_krxsecd_queue_incoming_call(msg); | |
578 | rxrpc_put_message(msg); | |
579 | ||
580 | _leave(" = 0"); | |
581 | ||
582 | return 0; | |
583 | } /* end rxrpc_trans_receive_new_call() */ | |
584 | ||
585 | /*****************************************************************************/ | |
586 | /* | |
587 | * perform an immediate abort without connection or call structures | |
588 | */ | |
589 | int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans, | |
590 | struct rxrpc_message *msg, | |
591 | int error) | |
592 | { | |
593 | struct rxrpc_header ahdr; | |
594 | struct sockaddr_in sin; | |
595 | struct msghdr msghdr; | |
596 | struct kvec iov[2]; | |
597 | __be32 _error; | |
598 | int len, ret; | |
599 | ||
600 | _enter("%p,%p,%d", trans, msg, error); | |
601 | ||
602 | /* don't abort an abort packet */ | |
603 | if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) { | |
604 | _leave(" = 0"); | |
605 | return 0; | |
606 | } | |
607 | ||
608 | _error = htonl(-error); | |
609 | ||
610 | /* set up the message to be transmitted */ | |
611 | memcpy(&ahdr, &msg->hdr, sizeof(ahdr)); | |
612 | ahdr.epoch = msg->hdr.epoch; | |
613 | ahdr.serial = htonl(1); | |
614 | ahdr.seq = 0; | |
615 | ahdr.type = RXRPC_PACKET_TYPE_ABORT; | |
616 | ahdr.flags = RXRPC_LAST_PACKET; | |
617 | ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED; | |
618 | ||
619 | iov[0].iov_len = sizeof(ahdr); | |
620 | iov[0].iov_base = &ahdr; | |
621 | iov[1].iov_len = sizeof(_error); | |
622 | iov[1].iov_base = &_error; | |
623 | ||
624 | len = sizeof(ahdr) + sizeof(_error); | |
625 | ||
626 | memset(&sin,0,sizeof(sin)); | |
627 | sin.sin_family = AF_INET; | |
628 | sin.sin_port = msg->pkt->h.uh->source; | |
eddc9ec5 | 629 | sin.sin_addr.s_addr = ip_hdr(msg->pkt)->saddr; |
1da177e4 LT |
630 | |
631 | msghdr.msg_name = &sin; | |
632 | msghdr.msg_namelen = sizeof(sin); | |
633 | msghdr.msg_control = NULL; | |
634 | msghdr.msg_controllen = 0; | |
635 | msghdr.msg_flags = MSG_DONTWAIT; | |
636 | ||
637 | _net("Sending message type %d of %d bytes to %08x:%d", | |
638 | ahdr.type, | |
639 | len, | |
640 | ntohl(sin.sin_addr.s_addr), | |
641 | ntohs(sin.sin_port)); | |
642 | ||
643 | /* send the message */ | |
644 | ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len); | |
645 | ||
646 | _leave(" = %d", ret); | |
647 | return ret; | |
648 | } /* end rxrpc_trans_immediate_abort() */ | |
649 | ||
650 | /*****************************************************************************/ | |
651 | /* | |
652 | * receive an ICMP error report and percolate it to all connections | |
653 | * heading to the affected host or port | |
654 | */ | |
655 | static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans) | |
656 | { | |
657 | struct rxrpc_connection *conn; | |
658 | struct sockaddr_in sin; | |
659 | struct rxrpc_peer *peer; | |
660 | struct list_head connq, *_p; | |
661 | struct errormsg emsg; | |
662 | struct msghdr msg; | |
663 | __be16 port; | |
664 | int local, err; | |
665 | ||
666 | _enter("%p", trans); | |
667 | ||
668 | for (;;) { | |
669 | trans->error_rcvd = 0; | |
670 | ||
671 | /* try and receive an error message */ | |
672 | msg.msg_name = &sin; | |
673 | msg.msg_namelen = sizeof(sin); | |
674 | msg.msg_control = &emsg; | |
675 | msg.msg_controllen = sizeof(emsg); | |
676 | msg.msg_flags = 0; | |
677 | ||
678 | err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0, | |
679 | MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC); | |
680 | ||
681 | if (err == -EAGAIN) { | |
682 | _leave(""); | |
683 | return; | |
684 | } | |
685 | ||
686 | if (err < 0) { | |
687 | printk("%s: unable to recv an error report: %d\n", | |
688 | __FUNCTION__, err); | |
689 | _leave(""); | |
690 | return; | |
691 | } | |
692 | ||
693 | msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg; | |
694 | ||
695 | if (msg.msg_controllen < sizeof(emsg.cmsg) || | |
696 | msg.msg_namelen < sizeof(sin)) { | |
697 | printk("%s: short control message" | |
698 | " (nlen=%u clen=%Zu fl=%x)\n", | |
699 | __FUNCTION__, | |
700 | msg.msg_namelen, | |
701 | msg.msg_controllen, | |
702 | msg.msg_flags); | |
703 | continue; | |
704 | } | |
705 | ||
706 | _net("Rx Received control message" | |
707 | " { len=%Zu level=%u type=%u }", | |
708 | emsg.cmsg.cmsg_len, | |
709 | emsg.cmsg.cmsg_level, | |
710 | emsg.cmsg.cmsg_type); | |
711 | ||
712 | if (sin.sin_family != AF_INET) { | |
713 | printk("Rx Ignoring error report with non-INET address" | |
714 | " (fam=%u)", | |
715 | sin.sin_family); | |
716 | continue; | |
717 | } | |
718 | ||
719 | _net("Rx Received message pertaining to host addr=%x port=%hu", | |
720 | ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port)); | |
721 | ||
722 | if (emsg.cmsg.cmsg_level != SOL_IP || | |
723 | emsg.cmsg.cmsg_type != IP_RECVERR) { | |
724 | printk("Rx Ignoring unknown error report" | |
725 | " { level=%u type=%u }", | |
726 | emsg.cmsg.cmsg_level, | |
727 | emsg.cmsg.cmsg_type); | |
728 | continue; | |
729 | } | |
730 | ||
731 | if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) { | |
732 | printk("%s: short error message (%Zu)\n", | |
733 | __FUNCTION__, msg.msg_controllen); | |
734 | _leave(""); | |
735 | return; | |
736 | } | |
737 | ||
738 | port = sin.sin_port; | |
739 | ||
740 | switch (emsg.ee.ee_origin) { | |
741 | case SO_EE_ORIGIN_ICMP: | |
742 | local = 0; | |
743 | switch (emsg.ee.ee_type) { | |
744 | case ICMP_DEST_UNREACH: | |
745 | switch (emsg.ee.ee_code) { | |
746 | case ICMP_NET_UNREACH: | |
747 | _net("Rx Received ICMP Network Unreachable"); | |
748 | port = 0; | |
749 | err = -ENETUNREACH; | |
750 | break; | |
751 | case ICMP_HOST_UNREACH: | |
752 | _net("Rx Received ICMP Host Unreachable"); | |
753 | port = 0; | |
754 | err = -EHOSTUNREACH; | |
755 | break; | |
756 | case ICMP_PORT_UNREACH: | |
757 | _net("Rx Received ICMP Port Unreachable"); | |
758 | err = -ECONNREFUSED; | |
759 | break; | |
760 | case ICMP_NET_UNKNOWN: | |
761 | _net("Rx Received ICMP Unknown Network"); | |
762 | port = 0; | |
763 | err = -ENETUNREACH; | |
764 | break; | |
765 | case ICMP_HOST_UNKNOWN: | |
766 | _net("Rx Received ICMP Unknown Host"); | |
767 | port = 0; | |
768 | err = -EHOSTUNREACH; | |
769 | break; | |
770 | default: | |
771 | _net("Rx Received ICMP DestUnreach { code=%u }", | |
772 | emsg.ee.ee_code); | |
773 | err = emsg.ee.ee_errno; | |
774 | break; | |
775 | } | |
776 | break; | |
777 | ||
778 | case ICMP_TIME_EXCEEDED: | |
779 | _net("Rx Received ICMP TTL Exceeded"); | |
780 | err = emsg.ee.ee_errno; | |
781 | break; | |
782 | ||
783 | default: | |
784 | _proto("Rx Received ICMP error { type=%u code=%u }", | |
785 | emsg.ee.ee_type, emsg.ee.ee_code); | |
786 | err = emsg.ee.ee_errno; | |
787 | break; | |
788 | } | |
789 | break; | |
790 | ||
791 | case SO_EE_ORIGIN_LOCAL: | |
792 | _proto("Rx Received local error { error=%d }", | |
793 | emsg.ee.ee_errno); | |
794 | local = 1; | |
795 | err = emsg.ee.ee_errno; | |
796 | break; | |
797 | ||
798 | case SO_EE_ORIGIN_NONE: | |
799 | case SO_EE_ORIGIN_ICMP6: | |
800 | default: | |
801 | _proto("Rx Received error report { orig=%u }", | |
802 | emsg.ee.ee_origin); | |
803 | local = 0; | |
804 | err = emsg.ee.ee_errno; | |
805 | break; | |
806 | } | |
807 | ||
808 | /* find all the connections between this transport and the | |
809 | * affected destination */ | |
810 | INIT_LIST_HEAD(&connq); | |
811 | ||
812 | if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr, | |
813 | &peer) == 0) { | |
814 | read_lock(&peer->conn_lock); | |
815 | list_for_each(_p, &peer->conn_active) { | |
816 | conn = list_entry(_p, struct rxrpc_connection, | |
817 | link); | |
818 | if (port && conn->addr.sin_port != port) | |
819 | continue; | |
820 | if (!list_empty(&conn->err_link)) | |
821 | continue; | |
822 | ||
823 | rxrpc_get_connection(conn); | |
824 | list_add_tail(&conn->err_link, &connq); | |
825 | } | |
826 | read_unlock(&peer->conn_lock); | |
827 | ||
828 | /* service all those connections */ | |
829 | while (!list_empty(&connq)) { | |
830 | conn = list_entry(connq.next, | |
831 | struct rxrpc_connection, | |
832 | err_link); | |
833 | list_del(&conn->err_link); | |
834 | ||
835 | rxrpc_conn_handle_error(conn, local, err); | |
836 | ||
837 | rxrpc_put_connection(conn); | |
838 | } | |
839 | ||
840 | rxrpc_put_peer(peer); | |
841 | } | |
842 | } | |
843 | ||
844 | _leave(""); | |
845 | return; | |
846 | } /* end rxrpc_trans_receive_error_report() */ |