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