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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> | |
34 | #include <asm/checksum.h> | |
35 | #include "internal.h" | |
36 | ||
37 | struct errormsg { | |
38 | struct cmsghdr cmsg; /* control message header */ | |
39 | struct sock_extended_err ee; /* extended error information */ | |
40 | struct sockaddr_in icmp_src; /* ICMP packet source address */ | |
41 | }; | |
42 | ||
43 | static DEFINE_SPINLOCK(rxrpc_transports_lock); | |
44 | static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports); | |
45 | ||
46 | __RXACCT_DECL(atomic_t rxrpc_transport_count); | |
47 | LIST_HEAD(rxrpc_proc_transports); | |
48 | DECLARE_RWSEM(rxrpc_proc_transports_sem); | |
49 | ||
50 | static void rxrpc_data_ready(struct sock *sk, int count); | |
51 | static void rxrpc_error_report(struct sock *sk); | |
52 | static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans, | |
53 | struct list_head *msgq); | |
54 | static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans); | |
55 | ||
56 | /*****************************************************************************/ | |
57 | /* | |
58 | * create a new transport endpoint using the specified UDP port | |
59 | */ | |
60 | int rxrpc_create_transport(unsigned short port, | |
61 | struct rxrpc_transport **_trans) | |
62 | { | |
63 | struct rxrpc_transport *trans; | |
64 | struct sockaddr_in sin; | |
65 | mm_segment_t oldfs; | |
66 | struct sock *sock; | |
67 | int ret, opt; | |
68 | ||
69 | _enter("%hu", port); | |
70 | ||
71 | trans = kmalloc(sizeof(struct rxrpc_transport), GFP_KERNEL); | |
72 | if (!trans) | |
73 | return -ENOMEM; | |
74 | ||
75 | memset(trans, 0, sizeof(struct rxrpc_transport)); | |
76 | atomic_set(&trans->usage, 1); | |
77 | INIT_LIST_HEAD(&trans->services); | |
78 | INIT_LIST_HEAD(&trans->link); | |
79 | INIT_LIST_HEAD(&trans->krxiodq_link); | |
80 | spin_lock_init(&trans->lock); | |
81 | INIT_LIST_HEAD(&trans->peer_active); | |
82 | INIT_LIST_HEAD(&trans->peer_graveyard); | |
83 | spin_lock_init(&trans->peer_gylock); | |
84 | init_waitqueue_head(&trans->peer_gy_waitq); | |
85 | rwlock_init(&trans->peer_lock); | |
86 | atomic_set(&trans->peer_count, 0); | |
87 | trans->port = port; | |
88 | ||
89 | /* create a UDP socket to be my actual transport endpoint */ | |
90 | ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket); | |
91 | if (ret < 0) | |
92 | goto error; | |
93 | ||
94 | /* use the specified port */ | |
95 | if (port) { | |
96 | memset(&sin, 0, sizeof(sin)); | |
97 | sin.sin_family = AF_INET; | |
98 | sin.sin_port = htons(port); | |
99 | ret = trans->socket->ops->bind(trans->socket, | |
100 | (struct sockaddr *) &sin, | |
101 | sizeof(sin)); | |
102 | if (ret < 0) | |
103 | goto error; | |
104 | } | |
105 | ||
106 | opt = 1; | |
107 | oldfs = get_fs(); | |
108 | set_fs(KERNEL_DS); | |
109 | ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR, | |
110 | (char *) &opt, sizeof(opt)); | |
111 | set_fs(oldfs); | |
112 | ||
113 | spin_lock(&rxrpc_transports_lock); | |
114 | list_add(&trans->link, &rxrpc_transports); | |
115 | spin_unlock(&rxrpc_transports_lock); | |
116 | ||
117 | /* set the socket up */ | |
118 | sock = trans->socket->sk; | |
119 | sock->sk_user_data = trans; | |
120 | sock->sk_data_ready = rxrpc_data_ready; | |
121 | sock->sk_error_report = rxrpc_error_report; | |
122 | ||
123 | down_write(&rxrpc_proc_transports_sem); | |
124 | list_add_tail(&trans->proc_link, &rxrpc_proc_transports); | |
125 | up_write(&rxrpc_proc_transports_sem); | |
126 | ||
127 | __RXACCT(atomic_inc(&rxrpc_transport_count)); | |
128 | ||
129 | *_trans = trans; | |
130 | _leave(" = 0 (%p)", trans); | |
131 | return 0; | |
132 | ||
133 | error: | |
134 | /* finish cleaning up the transport (not really needed here, but...) */ | |
135 | if (trans->socket) | |
136 | trans->socket->ops->shutdown(trans->socket, 2); | |
137 | ||
138 | /* close the socket */ | |
139 | if (trans->socket) { | |
140 | trans->socket->sk->sk_user_data = NULL; | |
141 | sock_release(trans->socket); | |
142 | trans->socket = NULL; | |
143 | } | |
144 | ||
145 | kfree(trans); | |
146 | ||
147 | ||
148 | _leave(" = %d", ret); | |
149 | return ret; | |
150 | } /* end rxrpc_create_transport() */ | |
151 | ||
152 | /*****************************************************************************/ | |
153 | /* | |
154 | * destroy a transport endpoint | |
155 | */ | |
156 | void rxrpc_put_transport(struct rxrpc_transport *trans) | |
157 | { | |
158 | _enter("%p{u=%d p=%hu}", | |
159 | trans, atomic_read(&trans->usage), trans->port); | |
160 | ||
161 | BUG_ON(atomic_read(&trans->usage) <= 0); | |
162 | ||
163 | /* to prevent a race, the decrement and the dequeue must be | |
164 | * effectively atomic */ | |
165 | spin_lock(&rxrpc_transports_lock); | |
166 | if (likely(!atomic_dec_and_test(&trans->usage))) { | |
167 | spin_unlock(&rxrpc_transports_lock); | |
168 | _leave(""); | |
169 | return; | |
170 | } | |
171 | ||
172 | list_del(&trans->link); | |
173 | spin_unlock(&rxrpc_transports_lock); | |
174 | ||
175 | /* finish cleaning up the transport */ | |
176 | if (trans->socket) | |
177 | trans->socket->ops->shutdown(trans->socket, 2); | |
178 | ||
179 | rxrpc_krxsecd_clear_transport(trans); | |
180 | rxrpc_krxiod_dequeue_transport(trans); | |
181 | ||
182 | /* discard all peer information */ | |
183 | rxrpc_peer_clearall(trans); | |
184 | ||
185 | down_write(&rxrpc_proc_transports_sem); | |
186 | list_del(&trans->proc_link); | |
187 | up_write(&rxrpc_proc_transports_sem); | |
188 | __RXACCT(atomic_dec(&rxrpc_transport_count)); | |
189 | ||
190 | /* close the socket */ | |
191 | if (trans->socket) { | |
192 | trans->socket->sk->sk_user_data = NULL; | |
193 | sock_release(trans->socket); | |
194 | trans->socket = NULL; | |
195 | } | |
196 | ||
197 | kfree(trans); | |
198 | ||
199 | _leave(""); | |
200 | } /* end rxrpc_put_transport() */ | |
201 | ||
202 | /*****************************************************************************/ | |
203 | /* | |
204 | * add a service to a transport to be listened upon | |
205 | */ | |
206 | int rxrpc_add_service(struct rxrpc_transport *trans, | |
207 | struct rxrpc_service *newsrv) | |
208 | { | |
209 | struct rxrpc_service *srv; | |
210 | struct list_head *_p; | |
211 | int ret = -EEXIST; | |
212 | ||
213 | _enter("%p{%hu},%p{%hu}", | |
214 | trans, trans->port, newsrv, newsrv->service_id); | |
215 | ||
216 | /* verify that the service ID is not already present */ | |
217 | spin_lock(&trans->lock); | |
218 | ||
219 | list_for_each(_p, &trans->services) { | |
220 | srv = list_entry(_p, struct rxrpc_service, link); | |
221 | if (srv->service_id == newsrv->service_id) | |
222 | goto out; | |
223 | } | |
224 | ||
225 | /* okay - add the transport to the list */ | |
226 | list_add_tail(&newsrv->link, &trans->services); | |
227 | rxrpc_get_transport(trans); | |
228 | ret = 0; | |
229 | ||
230 | out: | |
231 | spin_unlock(&trans->lock); | |
232 | ||
233 | _leave("= %d", ret); | |
234 | return ret; | |
235 | } /* end rxrpc_add_service() */ | |
236 | ||
237 | /*****************************************************************************/ | |
238 | /* | |
239 | * remove a service from a transport | |
240 | */ | |
241 | void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv) | |
242 | { | |
243 | _enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id); | |
244 | ||
245 | spin_lock(&trans->lock); | |
246 | list_del(&srv->link); | |
247 | spin_unlock(&trans->lock); | |
248 | ||
249 | rxrpc_put_transport(trans); | |
250 | ||
251 | _leave(""); | |
252 | } /* end rxrpc_del_service() */ | |
253 | ||
254 | /*****************************************************************************/ | |
255 | /* | |
256 | * INET callback when data has been received on the socket. | |
257 | */ | |
258 | static void rxrpc_data_ready(struct sock *sk, int count) | |
259 | { | |
260 | struct rxrpc_transport *trans; | |
261 | ||
262 | _enter("%p{t=%p},%d", sk, sk->sk_user_data, count); | |
263 | ||
264 | /* queue the transport for attention by krxiod */ | |
265 | trans = (struct rxrpc_transport *) sk->sk_user_data; | |
266 | if (trans) | |
267 | rxrpc_krxiod_queue_transport(trans); | |
268 | ||
269 | /* wake up anyone waiting on the socket */ | |
270 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
271 | wake_up_interruptible(sk->sk_sleep); | |
272 | ||
273 | _leave(""); | |
274 | } /* end rxrpc_data_ready() */ | |
275 | ||
276 | /*****************************************************************************/ | |
277 | /* | |
278 | * INET callback when an ICMP error packet is received | |
279 | * - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE) | |
280 | */ | |
281 | static void rxrpc_error_report(struct sock *sk) | |
282 | { | |
283 | struct rxrpc_transport *trans; | |
284 | ||
285 | _enter("%p{t=%p}", sk, sk->sk_user_data); | |
286 | ||
287 | /* queue the transport for attention by krxiod */ | |
288 | trans = (struct rxrpc_transport *) sk->sk_user_data; | |
289 | if (trans) { | |
290 | trans->error_rcvd = 1; | |
291 | rxrpc_krxiod_queue_transport(trans); | |
292 | } | |
293 | ||
294 | /* wake up anyone waiting on the socket */ | |
295 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
296 | wake_up_interruptible(sk->sk_sleep); | |
297 | ||
298 | _leave(""); | |
299 | } /* end rxrpc_error_report() */ | |
300 | ||
301 | /*****************************************************************************/ | |
302 | /* | |
303 | * split a message up, allocating message records and filling them in | |
304 | * from the contents of a socket buffer | |
305 | */ | |
306 | static int rxrpc_incoming_msg(struct rxrpc_transport *trans, | |
307 | struct sk_buff *pkt, | |
308 | struct list_head *msgq) | |
309 | { | |
310 | struct rxrpc_message *msg; | |
311 | int ret; | |
312 | ||
313 | _enter(""); | |
314 | ||
315 | msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL); | |
316 | if (!msg) { | |
317 | _leave(" = -ENOMEM"); | |
318 | return -ENOMEM; | |
319 | } | |
320 | ||
321 | memset(msg, 0, sizeof(*msg)); | |
322 | atomic_set(&msg->usage, 1); | |
323 | list_add_tail(&msg->link,msgq); | |
324 | ||
325 | /* dig out the Rx routing parameters */ | |
326 | if (skb_copy_bits(pkt, sizeof(struct udphdr), | |
327 | &msg->hdr, sizeof(msg->hdr)) < 0) { | |
328 | ret = -EBADMSG; | |
329 | goto error; | |
330 | } | |
331 | ||
332 | msg->trans = trans; | |
333 | msg->state = RXRPC_MSG_RECEIVED; | |
9deff7f2 | 334 | skb_get_timestamp(pkt, &msg->stamp); |
1da177e4 LT |
335 | if (msg->stamp.tv_sec == 0) { |
336 | do_gettimeofday(&msg->stamp); | |
337 | if (pkt->sk) | |
338 | sock_enable_timestamp(pkt->sk); | |
339 | } | |
340 | msg->seq = ntohl(msg->hdr.seq); | |
341 | ||
342 | /* attach the packet */ | |
343 | skb_get(pkt); | |
344 | msg->pkt = pkt; | |
345 | ||
346 | msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header); | |
347 | msg->dsize = msg->pkt->len - msg->offset; | |
348 | ||
349 | _net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)", | |
350 | msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server", | |
351 | ntohl(msg->hdr.epoch), | |
352 | (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT, | |
353 | ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK, | |
354 | ntohl(msg->hdr.callNumber), | |
355 | rxrpc_pkts[msg->hdr.type], | |
356 | msg->hdr.flags, | |
357 | ntohs(msg->hdr.serviceId), | |
358 | msg->hdr.securityIndex); | |
359 | ||
360 | __RXACCT(atomic_inc(&rxrpc_message_count)); | |
361 | ||
362 | /* split off jumbo packets */ | |
363 | while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
364 | msg->hdr.flags & RXRPC_JUMBO_PACKET | |
365 | ) { | |
366 | struct rxrpc_jumbo_header jumbo; | |
367 | struct rxrpc_message *jumbomsg = msg; | |
368 | ||
369 | _debug("split jumbo packet"); | |
370 | ||
371 | /* quick sanity check */ | |
372 | ret = -EBADMSG; | |
373 | if (msg->dsize < | |
374 | RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header)) | |
375 | goto error; | |
376 | if (msg->hdr.flags & RXRPC_LAST_PACKET) | |
377 | goto error; | |
378 | ||
379 | /* dig out the secondary header */ | |
380 | if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN, | |
381 | &jumbo, sizeof(jumbo)) < 0) | |
382 | goto error; | |
383 | ||
384 | /* allocate a new message record */ | |
385 | ret = -ENOMEM; | |
386 | msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL); | |
387 | if (!msg) | |
388 | goto error; | |
389 | ||
390 | memcpy(msg, jumbomsg, sizeof(*msg)); | |
391 | list_add_tail(&msg->link, msgq); | |
392 | ||
393 | /* adjust the jumbo packet */ | |
394 | jumbomsg->dsize = RXRPC_JUMBO_DATALEN; | |
395 | ||
396 | /* attach the packet here too */ | |
397 | skb_get(pkt); | |
398 | ||
399 | /* adjust the parameters */ | |
400 | msg->seq++; | |
401 | msg->hdr.seq = htonl(msg->seq); | |
402 | msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1); | |
403 | msg->offset += RXRPC_JUMBO_DATALEN + | |
404 | sizeof(struct rxrpc_jumbo_header); | |
405 | msg->dsize -= RXRPC_JUMBO_DATALEN + | |
406 | sizeof(struct rxrpc_jumbo_header); | |
407 | msg->hdr.flags = jumbo.flags; | |
408 | msg->hdr._rsvd = jumbo._rsvd; | |
409 | ||
410 | _net("Rx Split jumbo packet from %s" | |
411 | " (%08x;%08x,%1x,%d,%s,%02x,%d,%d)", | |
412 | msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server", | |
413 | ntohl(msg->hdr.epoch), | |
414 | (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT, | |
415 | ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK, | |
416 | ntohl(msg->hdr.callNumber), | |
417 | rxrpc_pkts[msg->hdr.type], | |
418 | msg->hdr.flags, | |
419 | ntohs(msg->hdr.serviceId), | |
420 | msg->hdr.securityIndex); | |
421 | ||
422 | __RXACCT(atomic_inc(&rxrpc_message_count)); | |
423 | } | |
424 | ||
425 | _leave(" = 0 #%d", atomic_read(&rxrpc_message_count)); | |
426 | return 0; | |
427 | ||
428 | error: | |
429 | while (!list_empty(msgq)) { | |
430 | msg = list_entry(msgq->next, struct rxrpc_message, link); | |
431 | list_del_init(&msg->link); | |
432 | ||
433 | rxrpc_put_message(msg); | |
434 | } | |
435 | ||
436 | _leave(" = %d", ret); | |
437 | return ret; | |
438 | } /* end rxrpc_incoming_msg() */ | |
439 | ||
440 | /*****************************************************************************/ | |
441 | /* | |
442 | * accept a new call | |
443 | * - called from krxiod in process context | |
444 | */ | |
445 | void rxrpc_trans_receive_packet(struct rxrpc_transport *trans) | |
446 | { | |
447 | struct rxrpc_message *msg; | |
448 | struct rxrpc_peer *peer; | |
449 | struct sk_buff *pkt; | |
450 | int ret; | |
451 | __be32 addr; | |
452 | __be16 port; | |
453 | ||
454 | LIST_HEAD(msgq); | |
455 | ||
456 | _enter("%p{%d}", trans, trans->port); | |
457 | ||
458 | for (;;) { | |
459 | /* deal with outstanting errors first */ | |
460 | if (trans->error_rcvd) | |
461 | rxrpc_trans_receive_error_report(trans); | |
462 | ||
463 | /* attempt to receive a packet */ | |
464 | pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret); | |
465 | if (!pkt) { | |
466 | if (ret == -EAGAIN) { | |
467 | _leave(" EAGAIN"); | |
468 | return; | |
469 | } | |
470 | ||
471 | /* an icmp error may have occurred */ | |
472 | rxrpc_krxiod_queue_transport(trans); | |
473 | _leave(" error %d\n", ret); | |
474 | return; | |
475 | } | |
476 | ||
477 | /* we'll probably need to checksum it (didn't call | |
478 | * sock_recvmsg) */ | |
fb286bb2 HX |
479 | if (skb_checksum_complete(pkt)) { |
480 | kfree_skb(pkt); | |
481 | rxrpc_krxiod_queue_transport(trans); | |
482 | _leave(" CSUM failed"); | |
483 | return; | |
1da177e4 LT |
484 | } |
485 | ||
486 | addr = pkt->nh.iph->saddr; | |
487 | port = pkt->h.uh->source; | |
488 | ||
489 | _net("Rx Received UDP packet from %08x:%04hu", | |
490 | ntohl(addr), ntohs(port)); | |
491 | ||
492 | /* unmarshall the Rx parameters and split jumbo packets */ | |
493 | ret = rxrpc_incoming_msg(trans, pkt, &msgq); | |
494 | if (ret < 0) { | |
495 | kfree_skb(pkt); | |
496 | rxrpc_krxiod_queue_transport(trans); | |
497 | _leave(" bad packet"); | |
498 | return; | |
499 | } | |
500 | ||
501 | BUG_ON(list_empty(&msgq)); | |
502 | ||
503 | msg = list_entry(msgq.next, struct rxrpc_message, link); | |
504 | ||
505 | /* locate the record for the peer from which it | |
506 | * originated */ | |
507 | ret = rxrpc_peer_lookup(trans, addr, &peer); | |
508 | if (ret < 0) { | |
509 | kdebug("Rx No connections from that peer"); | |
510 | rxrpc_trans_immediate_abort(trans, msg, -EINVAL); | |
511 | goto finished_msg; | |
512 | } | |
513 | ||
514 | /* try and find a matching connection */ | |
515 | ret = rxrpc_connection_lookup(peer, msg, &msg->conn); | |
516 | if (ret < 0) { | |
517 | kdebug("Rx Unknown Connection"); | |
518 | rxrpc_trans_immediate_abort(trans, msg, -EINVAL); | |
519 | rxrpc_put_peer(peer); | |
520 | goto finished_msg; | |
521 | } | |
522 | rxrpc_put_peer(peer); | |
523 | ||
524 | /* deal with the first packet of a new call */ | |
525 | if (msg->hdr.flags & RXRPC_CLIENT_INITIATED && | |
526 | msg->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
527 | ntohl(msg->hdr.seq) == 1 | |
528 | ) { | |
529 | _debug("Rx New server call"); | |
530 | rxrpc_trans_receive_new_call(trans, &msgq); | |
531 | goto finished_msg; | |
532 | } | |
533 | ||
534 | /* deal with subsequent packet(s) of call */ | |
535 | _debug("Rx Call packet"); | |
536 | while (!list_empty(&msgq)) { | |
537 | msg = list_entry(msgq.next, struct rxrpc_message, link); | |
538 | list_del_init(&msg->link); | |
539 | ||
540 | ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg); | |
541 | if (ret < 0) { | |
542 | rxrpc_trans_immediate_abort(trans, msg, ret); | |
543 | rxrpc_put_message(msg); | |
544 | goto finished_msg; | |
545 | } | |
546 | ||
547 | rxrpc_put_message(msg); | |
548 | } | |
549 | ||
550 | goto finished_msg; | |
551 | ||
552 | /* dispose of the packets */ | |
553 | finished_msg: | |
554 | while (!list_empty(&msgq)) { | |
555 | msg = list_entry(msgq.next, struct rxrpc_message, link); | |
556 | list_del_init(&msg->link); | |
557 | ||
558 | rxrpc_put_message(msg); | |
559 | } | |
560 | kfree_skb(pkt); | |
561 | } | |
562 | ||
563 | _leave(""); | |
564 | ||
565 | } /* end rxrpc_trans_receive_packet() */ | |
566 | ||
567 | /*****************************************************************************/ | |
568 | /* | |
569 | * accept a new call from a client trying to connect to one of my services | |
570 | * - called in process context | |
571 | */ | |
572 | static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans, | |
573 | struct list_head *msgq) | |
574 | { | |
575 | struct rxrpc_message *msg; | |
576 | ||
577 | _enter(""); | |
578 | ||
579 | /* only bother with the first packet */ | |
580 | msg = list_entry(msgq->next, struct rxrpc_message, link); | |
581 | list_del_init(&msg->link); | |
582 | rxrpc_krxsecd_queue_incoming_call(msg); | |
583 | rxrpc_put_message(msg); | |
584 | ||
585 | _leave(" = 0"); | |
586 | ||
587 | return 0; | |
588 | } /* end rxrpc_trans_receive_new_call() */ | |
589 | ||
590 | /*****************************************************************************/ | |
591 | /* | |
592 | * perform an immediate abort without connection or call structures | |
593 | */ | |
594 | int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans, | |
595 | struct rxrpc_message *msg, | |
596 | int error) | |
597 | { | |
598 | struct rxrpc_header ahdr; | |
599 | struct sockaddr_in sin; | |
600 | struct msghdr msghdr; | |
601 | struct kvec iov[2]; | |
602 | __be32 _error; | |
603 | int len, ret; | |
604 | ||
605 | _enter("%p,%p,%d", trans, msg, error); | |
606 | ||
607 | /* don't abort an abort packet */ | |
608 | if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) { | |
609 | _leave(" = 0"); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | _error = htonl(-error); | |
614 | ||
615 | /* set up the message to be transmitted */ | |
616 | memcpy(&ahdr, &msg->hdr, sizeof(ahdr)); | |
617 | ahdr.epoch = msg->hdr.epoch; | |
618 | ahdr.serial = htonl(1); | |
619 | ahdr.seq = 0; | |
620 | ahdr.type = RXRPC_PACKET_TYPE_ABORT; | |
621 | ahdr.flags = RXRPC_LAST_PACKET; | |
622 | ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED; | |
623 | ||
624 | iov[0].iov_len = sizeof(ahdr); | |
625 | iov[0].iov_base = &ahdr; | |
626 | iov[1].iov_len = sizeof(_error); | |
627 | iov[1].iov_base = &_error; | |
628 | ||
629 | len = sizeof(ahdr) + sizeof(_error); | |
630 | ||
631 | memset(&sin,0,sizeof(sin)); | |
632 | sin.sin_family = AF_INET; | |
633 | sin.sin_port = msg->pkt->h.uh->source; | |
634 | sin.sin_addr.s_addr = msg->pkt->nh.iph->saddr; | |
635 | ||
636 | msghdr.msg_name = &sin; | |
637 | msghdr.msg_namelen = sizeof(sin); | |
638 | msghdr.msg_control = NULL; | |
639 | msghdr.msg_controllen = 0; | |
640 | msghdr.msg_flags = MSG_DONTWAIT; | |
641 | ||
642 | _net("Sending message type %d of %d bytes to %08x:%d", | |
643 | ahdr.type, | |
644 | len, | |
645 | ntohl(sin.sin_addr.s_addr), | |
646 | ntohs(sin.sin_port)); | |
647 | ||
648 | /* send the message */ | |
649 | ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len); | |
650 | ||
651 | _leave(" = %d", ret); | |
652 | return ret; | |
653 | } /* end rxrpc_trans_immediate_abort() */ | |
654 | ||
655 | /*****************************************************************************/ | |
656 | /* | |
657 | * receive an ICMP error report and percolate it to all connections | |
658 | * heading to the affected host or port | |
659 | */ | |
660 | static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans) | |
661 | { | |
662 | struct rxrpc_connection *conn; | |
663 | struct sockaddr_in sin; | |
664 | struct rxrpc_peer *peer; | |
665 | struct list_head connq, *_p; | |
666 | struct errormsg emsg; | |
667 | struct msghdr msg; | |
668 | __be16 port; | |
669 | int local, err; | |
670 | ||
671 | _enter("%p", trans); | |
672 | ||
673 | for (;;) { | |
674 | trans->error_rcvd = 0; | |
675 | ||
676 | /* try and receive an error message */ | |
677 | msg.msg_name = &sin; | |
678 | msg.msg_namelen = sizeof(sin); | |
679 | msg.msg_control = &emsg; | |
680 | msg.msg_controllen = sizeof(emsg); | |
681 | msg.msg_flags = 0; | |
682 | ||
683 | err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0, | |
684 | MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC); | |
685 | ||
686 | if (err == -EAGAIN) { | |
687 | _leave(""); | |
688 | return; | |
689 | } | |
690 | ||
691 | if (err < 0) { | |
692 | printk("%s: unable to recv an error report: %d\n", | |
693 | __FUNCTION__, err); | |
694 | _leave(""); | |
695 | return; | |
696 | } | |
697 | ||
698 | msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg; | |
699 | ||
700 | if (msg.msg_controllen < sizeof(emsg.cmsg) || | |
701 | msg.msg_namelen < sizeof(sin)) { | |
702 | printk("%s: short control message" | |
703 | " (nlen=%u clen=%Zu fl=%x)\n", | |
704 | __FUNCTION__, | |
705 | msg.msg_namelen, | |
706 | msg.msg_controllen, | |
707 | msg.msg_flags); | |
708 | continue; | |
709 | } | |
710 | ||
711 | _net("Rx Received control message" | |
712 | " { len=%Zu level=%u type=%u }", | |
713 | emsg.cmsg.cmsg_len, | |
714 | emsg.cmsg.cmsg_level, | |
715 | emsg.cmsg.cmsg_type); | |
716 | ||
717 | if (sin.sin_family != AF_INET) { | |
718 | printk("Rx Ignoring error report with non-INET address" | |
719 | " (fam=%u)", | |
720 | sin.sin_family); | |
721 | continue; | |
722 | } | |
723 | ||
724 | _net("Rx Received message pertaining to host addr=%x port=%hu", | |
725 | ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port)); | |
726 | ||
727 | if (emsg.cmsg.cmsg_level != SOL_IP || | |
728 | emsg.cmsg.cmsg_type != IP_RECVERR) { | |
729 | printk("Rx Ignoring unknown error report" | |
730 | " { level=%u type=%u }", | |
731 | emsg.cmsg.cmsg_level, | |
732 | emsg.cmsg.cmsg_type); | |
733 | continue; | |
734 | } | |
735 | ||
736 | if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) { | |
737 | printk("%s: short error message (%Zu)\n", | |
738 | __FUNCTION__, msg.msg_controllen); | |
739 | _leave(""); | |
740 | return; | |
741 | } | |
742 | ||
743 | port = sin.sin_port; | |
744 | ||
745 | switch (emsg.ee.ee_origin) { | |
746 | case SO_EE_ORIGIN_ICMP: | |
747 | local = 0; | |
748 | switch (emsg.ee.ee_type) { | |
749 | case ICMP_DEST_UNREACH: | |
750 | switch (emsg.ee.ee_code) { | |
751 | case ICMP_NET_UNREACH: | |
752 | _net("Rx Received ICMP Network Unreachable"); | |
753 | port = 0; | |
754 | err = -ENETUNREACH; | |
755 | break; | |
756 | case ICMP_HOST_UNREACH: | |
757 | _net("Rx Received ICMP Host Unreachable"); | |
758 | port = 0; | |
759 | err = -EHOSTUNREACH; | |
760 | break; | |
761 | case ICMP_PORT_UNREACH: | |
762 | _net("Rx Received ICMP Port Unreachable"); | |
763 | err = -ECONNREFUSED; | |
764 | break; | |
765 | case ICMP_NET_UNKNOWN: | |
766 | _net("Rx Received ICMP Unknown Network"); | |
767 | port = 0; | |
768 | err = -ENETUNREACH; | |
769 | break; | |
770 | case ICMP_HOST_UNKNOWN: | |
771 | _net("Rx Received ICMP Unknown Host"); | |
772 | port = 0; | |
773 | err = -EHOSTUNREACH; | |
774 | break; | |
775 | default: | |
776 | _net("Rx Received ICMP DestUnreach { code=%u }", | |
777 | emsg.ee.ee_code); | |
778 | err = emsg.ee.ee_errno; | |
779 | break; | |
780 | } | |
781 | break; | |
782 | ||
783 | case ICMP_TIME_EXCEEDED: | |
784 | _net("Rx Received ICMP TTL Exceeded"); | |
785 | err = emsg.ee.ee_errno; | |
786 | break; | |
787 | ||
788 | default: | |
789 | _proto("Rx Received ICMP error { type=%u code=%u }", | |
790 | emsg.ee.ee_type, emsg.ee.ee_code); | |
791 | err = emsg.ee.ee_errno; | |
792 | break; | |
793 | } | |
794 | break; | |
795 | ||
796 | case SO_EE_ORIGIN_LOCAL: | |
797 | _proto("Rx Received local error { error=%d }", | |
798 | emsg.ee.ee_errno); | |
799 | local = 1; | |
800 | err = emsg.ee.ee_errno; | |
801 | break; | |
802 | ||
803 | case SO_EE_ORIGIN_NONE: | |
804 | case SO_EE_ORIGIN_ICMP6: | |
805 | default: | |
806 | _proto("Rx Received error report { orig=%u }", | |
807 | emsg.ee.ee_origin); | |
808 | local = 0; | |
809 | err = emsg.ee.ee_errno; | |
810 | break; | |
811 | } | |
812 | ||
813 | /* find all the connections between this transport and the | |
814 | * affected destination */ | |
815 | INIT_LIST_HEAD(&connq); | |
816 | ||
817 | if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr, | |
818 | &peer) == 0) { | |
819 | read_lock(&peer->conn_lock); | |
820 | list_for_each(_p, &peer->conn_active) { | |
821 | conn = list_entry(_p, struct rxrpc_connection, | |
822 | link); | |
823 | if (port && conn->addr.sin_port != port) | |
824 | continue; | |
825 | if (!list_empty(&conn->err_link)) | |
826 | continue; | |
827 | ||
828 | rxrpc_get_connection(conn); | |
829 | list_add_tail(&conn->err_link, &connq); | |
830 | } | |
831 | read_unlock(&peer->conn_lock); | |
832 | ||
833 | /* service all those connections */ | |
834 | while (!list_empty(&connq)) { | |
835 | conn = list_entry(connq.next, | |
836 | struct rxrpc_connection, | |
837 | err_link); | |
838 | list_del(&conn->err_link); | |
839 | ||
840 | rxrpc_conn_handle_error(conn, local, err); | |
841 | ||
842 | rxrpc_put_connection(conn); | |
843 | } | |
844 | ||
845 | rxrpc_put_peer(peer); | |
846 | } | |
847 | } | |
848 | ||
849 | _leave(""); | |
850 | return; | |
851 | } /* end rxrpc_trans_receive_error_report() */ |