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[POWERPC] Generic DCR infrastructure
[linux-2.6.22.y-op.git] / net / rxrpc / transport.c
blob4268b38d92d25e4d66a972e1b498793b6004400b
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 <linux/skbuff.h>
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 "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 = kzalloc(sizeof(struct rxrpc_transport), GFP_KERNEL);
71 if (!trans)
72 return -ENOMEM;
73
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
313 msg = kzalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
314 if (!msg) {
315 _leave(" = -ENOMEM");
316 return -ENOMEM;
317 }
318
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;
331 skb_get_timestamp(pkt, &msg->stamp);
332 if (msg->stamp.tv_sec == 0) {
333 do_gettimeofday(&msg->stamp);
334 if (pkt->sk)
335 sock_enable_timestamp(pkt->sk);
336 }
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;
383 msg = kmemdup(jumbomsg, sizeof(struct rxrpc_message), GFP_KERNEL);
384 if (!msg)
385 goto error;
386
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) */
475 if (skb_checksum_complete(pkt)) {
476 kfree_skb(pkt);
477 rxrpc_krxiod_queue_transport(trans);
478 _leave(" CSUM failed");
479 return;
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() */
linux v2.6.22.y-op