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