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Commit | Line | Data |
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718e3744 | 1 | /* BGP packet management routine. |
2 | Copyright (C) 1999 Kunihiro Ishiguro | |
3 | ||
4 | This file is part of GNU Zebra. | |
5 | ||
6 | GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 2, or (at your option) any | |
9 | later version. | |
10 | ||
11 | GNU Zebra is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "thread.h" | |
24 | #include "stream.h" | |
25 | #include "network.h" | |
26 | #include "prefix.h" | |
27 | #include "command.h" | |
28 | #include "log.h" | |
29 | #include "memory.h" | |
30 | #include "sockunion.h" /* for inet_ntop () */ | |
baa376fc | 31 | #include "sockopt.h" |
718e3744 | 32 | #include "linklist.h" |
33 | #include "plist.h" | |
3f9c7369 | 34 | #include "queue.h" |
039f3a34 | 35 | #include "filter.h" |
718e3744 | 36 | |
37 | #include "bgpd/bgpd.h" | |
38 | #include "bgpd/bgp_table.h" | |
39 | #include "bgpd/bgp_dump.h" | |
40 | #include "bgpd/bgp_attr.h" | |
41 | #include "bgpd/bgp_debug.h" | |
42 | #include "bgpd/bgp_fsm.h" | |
43 | #include "bgpd/bgp_route.h" | |
44 | #include "bgpd/bgp_packet.h" | |
45 | #include "bgpd/bgp_open.h" | |
46 | #include "bgpd/bgp_aspath.h" | |
47 | #include "bgpd/bgp_community.h" | |
48 | #include "bgpd/bgp_ecommunity.h" | |
49 | #include "bgpd/bgp_network.h" | |
50 | #include "bgpd/bgp_mplsvpn.h" | |
587ff0fd | 51 | #include "bgpd/bgp_encap.h" |
718e3744 | 52 | #include "bgpd/bgp_advertise.h" |
93406d87 | 53 | #include "bgpd/bgp_vty.h" |
3f9c7369 | 54 | #include "bgpd/bgp_updgrp.h" |
718e3744 | 55 | |
718e3744 | 56 | /* Set up BGP packet marker and packet type. */ |
3f9c7369 | 57 | int |
718e3744 | 58 | bgp_packet_set_marker (struct stream *s, u_char type) |
59 | { | |
60 | int i; | |
61 | ||
62 | /* Fill in marker. */ | |
63 | for (i = 0; i < BGP_MARKER_SIZE; i++) | |
64 | stream_putc (s, 0xff); | |
65 | ||
66 | /* Dummy total length. This field is should be filled in later on. */ | |
67 | stream_putw (s, 0); | |
68 | ||
69 | /* BGP packet type. */ | |
70 | stream_putc (s, type); | |
71 | ||
72 | /* Return current stream size. */ | |
9985f83c | 73 | return stream_get_endp (s); |
718e3744 | 74 | } |
75 | ||
76 | /* Set BGP packet header size entry. If size is zero then use current | |
77 | stream size. */ | |
3f9c7369 | 78 | int |
718e3744 | 79 | bgp_packet_set_size (struct stream *s) |
80 | { | |
81 | int cp; | |
82 | ||
83 | /* Preserve current pointer. */ | |
9985f83c | 84 | cp = stream_get_endp (s); |
85 | stream_putw_at (s, BGP_MARKER_SIZE, cp); | |
718e3744 | 86 | |
87 | return cp; | |
88 | } | |
89 | ||
90 | /* Add new packet to the peer. */ | |
3f9c7369 | 91 | void |
718e3744 | 92 | bgp_packet_add (struct peer *peer, struct stream *s) |
93 | { | |
94 | /* Add packet to the end of list. */ | |
95 | stream_fifo_push (peer->obuf, s); | |
96 | } | |
97 | ||
98 | /* Free first packet. */ | |
94f2b392 | 99 | static void |
718e3744 | 100 | bgp_packet_delete (struct peer *peer) |
101 | { | |
102 | stream_free (stream_fifo_pop (peer->obuf)); | |
103 | } | |
104 | ||
718e3744 | 105 | /* Check file descriptor whether connect is established. */ |
fc9a856f DS |
106 | int |
107 | bgp_connect_check (struct peer *peer, int change_state) | |
718e3744 | 108 | { |
109 | int status; | |
5228ad27 | 110 | socklen_t slen; |
718e3744 | 111 | int ret; |
112 | ||
113 | /* Anyway I have to reset read and write thread. */ | |
114 | BGP_READ_OFF (peer->t_read); | |
115 | BGP_WRITE_OFF (peer->t_write); | |
116 | ||
117 | /* Check file descriptor. */ | |
118 | slen = sizeof (status); | |
eb821189 | 119 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *) &status, &slen); |
718e3744 | 120 | |
121 | /* If getsockopt is fail, this is fatal error. */ | |
122 | if (ret < 0) | |
123 | { | |
16286195 | 124 | zlog_info ("can't get sockopt for nonblocking connect"); |
718e3744 | 125 | BGP_EVENT_ADD (peer, TCP_fatal_error); |
fc9a856f | 126 | return -1; |
718e3744 | 127 | } |
128 | ||
129 | /* When status is 0 then TCP connection is established. */ | |
130 | if (status == 0) | |
131 | { | |
132 | BGP_EVENT_ADD (peer, TCP_connection_open); | |
fc9a856f | 133 | return 1; |
718e3744 | 134 | } |
135 | else | |
136 | { | |
16286195 DS |
137 | if (bgp_debug_neighbor_events(peer)) |
138 | zlog_debug ("%s [Event] Connect failed (%s)", | |
139 | peer->host, safe_strerror (errno)); | |
fc9a856f DS |
140 | if (change_state) |
141 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
142 | return 0; | |
718e3744 | 143 | } |
144 | } | |
145 | ||
94f2b392 | 146 | static struct stream * |
93406d87 | 147 | bgp_update_packet_eor (struct peer *peer, afi_t afi, safi_t safi) |
148 | { | |
149 | struct stream *s; | |
9cabb64b | 150 | afi_t pkt_afi; |
151 | safi_t pkt_safi; | |
93406d87 | 152 | |
750e8146 PJ |
153 | if (DISABLE_BGP_ANNOUNCE) |
154 | return NULL; | |
93406d87 | 155 | |
16286195 | 156 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 157 | zlog_debug ("send End-of-RIB for %s to %s", afi_safi_print (afi, safi), peer->host); |
158 | ||
159 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
160 | ||
161 | /* Make BGP update packet. */ | |
162 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
163 | ||
164 | /* Unfeasible Routes Length */ | |
165 | stream_putw (s, 0); | |
718e3744 | 166 | |
93406d87 | 167 | if (afi == AFI_IP && safi == SAFI_UNICAST) |
168 | { | |
169 | /* Total Path Attribute Length */ | |
170 | stream_putw (s, 0); | |
171 | } | |
172 | else | |
173 | { | |
9cabb64b | 174 | /* Convert AFI, SAFI to values for packet. */ |
175 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
176 | ||
93406d87 | 177 | /* Total Path Attribute Length */ |
178 | stream_putw (s, 6); | |
179 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
180 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); | |
181 | stream_putc (s, 3); | |
9cabb64b | 182 | stream_putw (s, pkt_afi); |
183 | stream_putc (s, pkt_safi); | |
93406d87 | 184 | } |
185 | ||
186 | bgp_packet_set_size (s); | |
af4b20d2 DS |
187 | bgp_packet_add (peer, s); |
188 | return s; | |
718e3744 | 189 | } |
190 | ||
718e3744 | 191 | /* Get next packet to be written. */ |
94f2b392 | 192 | static struct stream * |
718e3744 | 193 | bgp_write_packet (struct peer *peer) |
194 | { | |
3f9c7369 DS |
195 | struct stream *s = NULL; |
196 | struct peer_af *paf; | |
197 | struct bpacket *next_pkt; | |
718e3744 | 198 | afi_t afi; |
199 | safi_t safi; | |
718e3744 | 200 | |
201 | s = stream_fifo_head (peer->obuf); | |
202 | if (s) | |
203 | return s; | |
204 | ||
3f9c7369 DS |
205 | /* |
206 | * The code beyond this part deals with update packets, proceed only | |
207 | * if peer is Established and updates are not on hold (as part of | |
208 | * update-delay post processing). | |
209 | */ | |
210 | if (peer->status != Established) | |
211 | return NULL; | |
212 | ||
2a3d5731 | 213 | if (peer->bgp && peer->bgp->main_peers_update_hold) |
4a16ae86 DS |
214 | return NULL; |
215 | ||
718e3744 | 216 | for (afi = AFI_IP; afi < AFI_MAX; afi++) |
217 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
218 | { | |
3f9c7369 DS |
219 | paf = peer_af_find (peer, afi, safi); |
220 | if (!paf || !PAF_SUBGRP(paf)) | |
221 | continue; | |
222 | next_pkt = paf->next_pkt_to_send; | |
223 | ||
224 | /* Try to generate a packet for the peer if we are at the end of | |
225 | * the list. Always try to push out WITHDRAWs first. */ | |
226 | if (!next_pkt || !next_pkt->buffer) | |
718e3744 | 227 | { |
3f9c7369 DS |
228 | next_pkt = subgroup_withdraw_packet(PAF_SUBGRP(paf)); |
229 | if (!next_pkt || !next_pkt->buffer) | |
230 | subgroup_update_packet (PAF_SUBGRP(paf)); | |
231 | next_pkt = paf->next_pkt_to_send; | |
718e3744 | 232 | } |
3f9c7369 DS |
233 | |
234 | /* If we still don't have a packet to send to the peer, then | |
235 | * try to find out out if we have to send eor or if not, skip to | |
236 | * the next AFI, SAFI. | |
237 | * Don't send the EOR prematurely... if the subgroup's coalesce | |
238 | * timer is running, the adjacency-out structure is not created | |
239 | * yet. | |
240 | */ | |
241 | if (!next_pkt || !next_pkt->buffer) | |
242 | { | |
243 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV)) | |
93406d87 | 244 | { |
3f9c7369 DS |
245 | if (!(PAF_SUBGRP(paf))->t_coalesce && |
246 | peer->afc_nego[afi][safi] && peer->synctime | |
247 | && ! CHECK_FLAG (peer->af_sflags[afi][safi], | |
44012991 | 248 | PEER_STATUS_EOR_SEND)) |
93406d87 | 249 | { |
3f9c7369 DS |
250 | SET_FLAG (peer->af_sflags[afi][safi], |
251 | PEER_STATUS_EOR_SEND); | |
252 | return bgp_update_packet_eor (peer, afi, safi); | |
93406d87 | 253 | } |
718e3744 | 254 | |
93406d87 | 255 | } |
3f9c7369 | 256 | continue; |
93406d87 | 257 | } |
718e3744 | 258 | |
718e3744 | 259 | |
3f9c7369 DS |
260 | /* |
261 | * Found a packet template to send, overwrite packet with appropriate | |
262 | * attributes from peer and advance peer | |
263 | */ | |
264 | s = bpacket_reformat_for_peer (next_pkt, paf); | |
265 | bpacket_queue_advance_peer (paf); | |
3f9c7369 DS |
266 | return s; |
267 | } | |
718e3744 | 268 | |
3f9c7369 | 269 | return NULL; |
d889623f DS |
270 | } |
271 | ||
3f9c7369 DS |
272 | /* The next action for the peer from a write perspective */ |
273 | static void | |
274 | bgp_write_proceed_actions (struct peer *peer) | |
d889623f DS |
275 | { |
276 | afi_t afi; | |
277 | safi_t safi; | |
3f9c7369 DS |
278 | struct peer_af *paf; |
279 | struct bpacket *next_pkt; | |
280 | int fullq_found = 0; | |
638dc828 | 281 | struct update_subgroup *subgrp; |
d889623f | 282 | |
3f9c7369 | 283 | if (stream_fifo_head (peer->obuf)) |
d889623f | 284 | { |
d889623f | 285 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
3f9c7369 | 286 | return; |
d889623f DS |
287 | } |
288 | ||
3f9c7369 DS |
289 | for (afi = AFI_IP; afi < AFI_MAX; afi++) |
290 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
291 | { | |
292 | paf = peer_af_find (peer, afi, safi); | |
293 | if (!paf) | |
294 | continue; | |
638dc828 DS |
295 | subgrp = paf->subgroup; |
296 | if (!subgrp) | |
297 | continue; | |
298 | ||
3f9c7369 DS |
299 | next_pkt = paf->next_pkt_to_send; |
300 | if (next_pkt && next_pkt->buffer) | |
301 | { | |
302 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
303 | return; | |
304 | } | |
638dc828 | 305 | |
3f9c7369 DS |
306 | /* No packets readily available for AFI/SAFI, are there subgroup packets |
307 | * that need to be generated? */ | |
638dc828 DS |
308 | if (bpacket_queue_is_full(SUBGRP_INST(subgrp), |
309 | SUBGRP_PKTQ(subgrp))) | |
3f9c7369 | 310 | fullq_found = 1; |
638dc828 | 311 | else if (subgroup_packets_to_build (subgrp)) |
3f9c7369 DS |
312 | { |
313 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
314 | return; | |
315 | } | |
638dc828 DS |
316 | |
317 | /* No packets to send, see if EOR is pending */ | |
318 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV)) | |
319 | { | |
320 | if (!subgrp->t_coalesce && | |
321 | peer->afc_nego[afi][safi] && | |
322 | peer->synctime && | |
323 | !CHECK_FLAG(peer->af_sflags[afi][safi], | |
324 | PEER_STATUS_EOR_SEND) && | |
325 | safi != SAFI_MPLS_VPN) | |
326 | { | |
327 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
328 | return; | |
329 | } | |
330 | ||
331 | } | |
3f9c7369 DS |
332 | } |
333 | if (fullq_found) | |
d889623f | 334 | { |
3f9c7369 DS |
335 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
336 | return; | |
d889623f DS |
337 | } |
338 | } | |
339 | ||
718e3744 | 340 | /* Write packet to the peer. */ |
341 | int | |
342 | bgp_write (struct thread *thread) | |
343 | { | |
344 | struct peer *peer; | |
345 | u_char type; | |
3f9c7369 | 346 | struct stream *s; |
718e3744 | 347 | int num; |
1ba2a97a | 348 | int update_last_write = 0; |
fd79ac91 | 349 | unsigned int count = 0; |
ffd0c037 | 350 | unsigned int oc = 0; |
718e3744 | 351 | |
352 | /* Yes first of all get peer pointer. */ | |
353 | peer = THREAD_ARG (thread); | |
354 | peer->t_write = NULL; | |
355 | ||
356 | /* For non-blocking IO check. */ | |
357 | if (peer->status == Connect) | |
358 | { | |
fc9a856f | 359 | bgp_connect_check (peer, 1); |
718e3744 | 360 | return 0; |
361 | } | |
362 | ||
eac5702d SH |
363 | s = bgp_write_packet (peer); |
364 | if (!s) | |
3f9c7369 DS |
365 | { |
366 | bgp_write_proceed_actions (peer); | |
367 | return 0; | |
368 | } | |
eac5702d SH |
369 | |
370 | sockopt_cork (peer->fd, 1); | |
371 | ||
cb1faec9 DS |
372 | oc = peer->update_out; |
373 | ||
eac5702d SH |
374 | /* Nonblocking write until TCP output buffer is full. */ |
375 | do | |
718e3744 | 376 | { |
377 | int writenum; | |
718e3744 | 378 | |
379 | /* Number of bytes to be sent. */ | |
380 | writenum = stream_get_endp (s) - stream_get_getp (s); | |
381 | ||
382 | /* Call write() system call. */ | |
eb821189 | 383 | num = write (peer->fd, STREAM_PNT (s), writenum); |
35398589 | 384 | if (num < 0) |
718e3744 | 385 | { |
eac5702d SH |
386 | /* write failed either retry needed or error */ |
387 | if (ERRNO_IO_RETRY(errno)) | |
388 | break; | |
389 | ||
390 | BGP_EVENT_ADD (peer, TCP_fatal_error); | |
718e3744 | 391 | return 0; |
392 | } | |
35398589 | 393 | |
718e3744 | 394 | if (num != writenum) |
395 | { | |
35398589 | 396 | /* Partial write */ |
9985f83c | 397 | stream_forward_getp (s, num); |
eac5702d | 398 | break; |
718e3744 | 399 | } |
400 | ||
401 | /* Retrieve BGP packet type. */ | |
402 | stream_set_getp (s, BGP_MARKER_SIZE + 2); | |
403 | type = stream_getc (s); | |
404 | ||
405 | switch (type) | |
406 | { | |
407 | case BGP_MSG_OPEN: | |
408 | peer->open_out++; | |
409 | break; | |
410 | case BGP_MSG_UPDATE: | |
411 | peer->update_out++; | |
412 | break; | |
413 | case BGP_MSG_NOTIFY: | |
414 | peer->notify_out++; | |
415 | /* Double start timer. */ | |
416 | peer->v_start *= 2; | |
417 | ||
418 | /* Overflow check. */ | |
419 | if (peer->v_start >= (60 * 2)) | |
420 | peer->v_start = (60 * 2); | |
421 | ||
ca058a30 | 422 | /* Flush any existing events */ |
dcdf399f | 423 | BGP_EVENT_ADD (peer, BGP_Stop); |
3a69f74a SH |
424 | goto done; |
425 | ||
718e3744 | 426 | case BGP_MSG_KEEPALIVE: |
427 | peer->keepalive_out++; | |
428 | break; | |
429 | case BGP_MSG_ROUTE_REFRESH_NEW: | |
430 | case BGP_MSG_ROUTE_REFRESH_OLD: | |
431 | peer->refresh_out++; | |
432 | break; | |
433 | case BGP_MSG_CAPABILITY: | |
434 | peer->dynamic_cap_out++; | |
435 | break; | |
436 | } | |
437 | ||
438 | /* OK we send packet so delete it. */ | |
439 | bgp_packet_delete (peer); | |
1ba2a97a | 440 | update_last_write = 1; |
718e3744 | 441 | } |
cb1faec9 | 442 | while (++count < peer->bgp->wpkt_quanta && |
eac5702d | 443 | (s = bgp_write_packet (peer)) != NULL); |
cb1faec9 | 444 | |
3f9c7369 | 445 | bgp_write_proceed_actions (peer); |
3a69f74a SH |
446 | |
447 | done: | |
1ba2a97a | 448 | /* Update last_update if UPDATEs were written. */ |
cb1faec9 | 449 | if (peer->update_out > oc) |
1ba2a97a DW |
450 | peer->last_update = bgp_clock (); |
451 | ||
452 | /* If we TXed any flavor of packet update last_write */ | |
453 | if (update_last_write) | |
cb1faec9 DS |
454 | peer->last_write = bgp_clock (); |
455 | ||
3a69f74a | 456 | sockopt_cork (peer->fd, 0); |
718e3744 | 457 | return 0; |
458 | } | |
459 | ||
460 | /* This is only for sending NOTIFICATION message to neighbor. */ | |
94f2b392 | 461 | static int |
718e3744 | 462 | bgp_write_notify (struct peer *peer) |
463 | { | |
35398589 | 464 | int ret, val; |
718e3744 | 465 | u_char type; |
3f9c7369 | 466 | struct stream *s; |
718e3744 | 467 | |
468 | /* There should be at least one packet. */ | |
469 | s = stream_fifo_head (peer->obuf); | |
470 | if (!s) | |
471 | return 0; | |
472 | assert (stream_get_endp (s) >= BGP_HEADER_SIZE); | |
473 | ||
86998bc2 LR |
474 | /* Stop collecting data within the socket */ |
475 | sockopt_cork (peer->fd, 0); | |
476 | ||
8ff202e2 DL |
477 | /* socket is in nonblocking mode, if we can't deliver the NOTIFY, well, |
478 | * we only care about getting a clean shutdown at this point. */ | |
86998bc2 | 479 | ret = write (peer->fd, STREAM_DATA (s), stream_get_endp (s)); |
8ff202e2 DL |
480 | |
481 | /* only connection reset/close gets counted as TCP_fatal_error, failure | |
482 | * to write the entire NOTIFY doesn't get different FSM treatment */ | |
718e3744 | 483 | if (ret <= 0) |
484 | { | |
dcdf399f | 485 | BGP_EVENT_ADD (peer, TCP_fatal_error); |
718e3744 | 486 | return 0; |
487 | } | |
488 | ||
86998bc2 LR |
489 | /* Disable Nagle, make NOTIFY packet go out right away */ |
490 | val = 1; | |
491 | (void) setsockopt (peer->fd, IPPROTO_TCP, TCP_NODELAY, | |
492 | (char *) &val, sizeof (val)); | |
493 | ||
718e3744 | 494 | /* Retrieve BGP packet type. */ |
495 | stream_set_getp (s, BGP_MARKER_SIZE + 2); | |
496 | type = stream_getc (s); | |
497 | ||
498 | assert (type == BGP_MSG_NOTIFY); | |
499 | ||
500 | /* Type should be notify. */ | |
501 | peer->notify_out++; | |
502 | ||
503 | /* Double start timer. */ | |
504 | peer->v_start *= 2; | |
505 | ||
506 | /* Overflow check. */ | |
507 | if (peer->v_start >= (60 * 2)) | |
508 | peer->v_start = (60 * 2); | |
509 | ||
1ff9a340 DS |
510 | /* Handle Graceful Restart case where the state changes to |
511 | Connect instead of Idle */ | |
dcdf399f | 512 | BGP_EVENT_ADD (peer, BGP_Stop); |
718e3744 | 513 | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /* Make keepalive packet and send it to the peer. */ | |
518 | void | |
519 | bgp_keepalive_send (struct peer *peer) | |
520 | { | |
521 | struct stream *s; | |
718e3744 | 522 | |
523 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
524 | ||
525 | /* Make keepalive packet. */ | |
526 | bgp_packet_set_marker (s, BGP_MSG_KEEPALIVE); | |
527 | ||
528 | /* Set packet size. */ | |
ffd0c037 | 529 | (void)bgp_packet_set_size (s); |
718e3744 | 530 | |
531 | /* Dump packet if debug option is set. */ | |
532 | /* bgp_packet_dump (s); */ | |
533 | ||
16286195 | 534 | if (bgp_debug_keepalive(peer)) |
6b51474d | 535 | zlog_debug ("%s sending KEEPALIVE", peer->host); |
718e3744 | 536 | |
537 | /* Add packet to the peer. */ | |
538 | bgp_packet_add (peer, s); | |
539 | ||
eb821189 | 540 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 541 | } |
542 | ||
543 | /* Make open packet and send it to the peer. */ | |
544 | void | |
545 | bgp_open_send (struct peer *peer) | |
546 | { | |
547 | struct stream *s; | |
718e3744 | 548 | u_int16_t send_holdtime; |
549 | as_t local_as; | |
550 | ||
551 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
552 | send_holdtime = peer->holdtime; | |
553 | else | |
554 | send_holdtime = peer->bgp->default_holdtime; | |
555 | ||
556 | /* local-as Change */ | |
557 | if (peer->change_local_as) | |
558 | local_as = peer->change_local_as; | |
559 | else | |
560 | local_as = peer->local_as; | |
561 | ||
562 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
563 | ||
564 | /* Make open packet. */ | |
565 | bgp_packet_set_marker (s, BGP_MSG_OPEN); | |
566 | ||
567 | /* Set open packet values. */ | |
568 | stream_putc (s, BGP_VERSION_4); /* BGP version */ | |
0b2aa3a0 PJ |
569 | stream_putw (s, (local_as <= BGP_AS_MAX) ? (u_int16_t) local_as |
570 | : BGP_AS_TRANS); | |
718e3744 | 571 | stream_putw (s, send_holdtime); /* Hold Time */ |
572 | stream_put_in_addr (s, &peer->local_id); /* BGP Identifier */ | |
573 | ||
574 | /* Set capability code. */ | |
575 | bgp_open_capability (s, peer); | |
576 | ||
577 | /* Set BGP packet length. */ | |
ffd0c037 | 578 | (void)bgp_packet_set_size (s); |
718e3744 | 579 | |
16286195 | 580 | if (bgp_debug_neighbor_events(peer)) |
aea339f7 | 581 | zlog_debug ("%s sending OPEN, version %d, my as %u, holdtime %d, id %s", |
718e3744 | 582 | peer->host, BGP_VERSION_4, local_as, |
583 | send_holdtime, inet_ntoa (peer->local_id)); | |
584 | ||
718e3744 | 585 | /* Dump packet if debug option is set. */ |
586 | /* bgp_packet_dump (s); */ | |
587 | ||
588 | /* Add packet to the peer. */ | |
589 | bgp_packet_add (peer, s); | |
590 | ||
eb821189 | 591 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 592 | } |
593 | ||
594 | /* Send BGP notify packet with data potion. */ | |
595 | void | |
596 | bgp_notify_send_with_data (struct peer *peer, u_char code, u_char sub_code, | |
597 | u_char *data, size_t datalen) | |
598 | { | |
599 | struct stream *s; | |
600 | int length; | |
601 | ||
602 | /* Allocate new stream. */ | |
603 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
604 | ||
605 | /* Make nitify packet. */ | |
606 | bgp_packet_set_marker (s, BGP_MSG_NOTIFY); | |
607 | ||
608 | /* Set notify packet values. */ | |
609 | stream_putc (s, code); /* BGP notify code */ | |
610 | stream_putc (s, sub_code); /* BGP notify sub_code */ | |
611 | ||
612 | /* If notify data is present. */ | |
613 | if (data) | |
614 | stream_write (s, data, datalen); | |
615 | ||
616 | /* Set BGP packet length. */ | |
617 | length = bgp_packet_set_size (s); | |
618 | ||
619 | /* Add packet to the peer. */ | |
620 | stream_fifo_clean (peer->obuf); | |
621 | bgp_packet_add (peer, s); | |
622 | ||
623 | /* For debug */ | |
624 | { | |
625 | struct bgp_notify bgp_notify; | |
626 | int first = 0; | |
627 | int i; | |
628 | char c[4]; | |
629 | ||
630 | bgp_notify.code = code; | |
631 | bgp_notify.subcode = sub_code; | |
632 | bgp_notify.data = NULL; | |
633 | bgp_notify.length = length - BGP_MSG_NOTIFY_MIN_SIZE; | |
3a8c7ba1 DW |
634 | |
635 | peer->notify.code = bgp_notify.code; | |
636 | peer->notify.subcode = bgp_notify.subcode; | |
718e3744 | 637 | |
638 | if (bgp_notify.length) | |
639 | { | |
640 | bgp_notify.data = XMALLOC (MTYPE_TMP, bgp_notify.length * 3); | |
641 | for (i = 0; i < bgp_notify.length; i++) | |
642 | if (first) | |
643 | { | |
644 | sprintf (c, " %02x", data[i]); | |
645 | strcat (bgp_notify.data, c); | |
646 | } | |
647 | else | |
648 | { | |
649 | first = 1; | |
650 | sprintf (c, "%02x", data[i]); | |
651 | strcpy (bgp_notify.data, c); | |
652 | } | |
653 | } | |
654 | bgp_notify_print (peer, &bgp_notify, "sending"); | |
9e08021c | 655 | |
718e3744 | 656 | if (bgp_notify.data) |
9e08021c DW |
657 | { |
658 | XFREE (MTYPE_TMP, bgp_notify.data); | |
659 | bgp_notify.data = NULL; | |
660 | bgp_notify.length = 0; | |
661 | } | |
718e3744 | 662 | } |
663 | ||
e0701b79 | 664 | /* peer reset cause */ |
3a8c7ba1 | 665 | if (code == BGP_NOTIFY_CEASE) |
e0701b79 | 666 | { |
667 | if (sub_code == BGP_NOTIFY_CEASE_ADMIN_RESET) | |
1212dc19 | 668 | peer->last_reset = PEER_DOWN_USER_RESET; |
e0701b79 | 669 | else if (sub_code == BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN) |
1212dc19 | 670 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; |
e0701b79 | 671 | else |
1212dc19 | 672 | peer->last_reset = PEER_DOWN_NOTIFY_SEND; |
e0701b79 | 673 | } |
3a8c7ba1 DW |
674 | else |
675 | peer->last_reset = PEER_DOWN_NOTIFY_SEND; | |
e0701b79 | 676 | |
7ccf5e59 | 677 | /* Call immediately. */ |
718e3744 | 678 | BGP_WRITE_OFF (peer->t_write); |
679 | ||
680 | bgp_write_notify (peer); | |
681 | } | |
682 | ||
683 | /* Send BGP notify packet. */ | |
684 | void | |
685 | bgp_notify_send (struct peer *peer, u_char code, u_char sub_code) | |
686 | { | |
687 | bgp_notify_send_with_data (peer, code, sub_code, NULL, 0); | |
688 | } | |
689 | ||
718e3744 | 690 | /* Send route refresh message to the peer. */ |
691 | void | |
692 | bgp_route_refresh_send (struct peer *peer, afi_t afi, safi_t safi, | |
693 | u_char orf_type, u_char when_to_refresh, int remove) | |
694 | { | |
695 | struct stream *s; | |
718e3744 | 696 | struct bgp_filter *filter; |
697 | int orf_refresh = 0; | |
9cabb64b | 698 | afi_t pkt_afi; |
699 | safi_t pkt_safi; | |
718e3744 | 700 | |
750e8146 PJ |
701 | if (DISABLE_BGP_ANNOUNCE) |
702 | return; | |
718e3744 | 703 | |
704 | filter = &peer->filter[afi][safi]; | |
705 | ||
9cabb64b | 706 | /* Convert AFI, SAFI to values for packet. */ |
707 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
718e3744 | 708 | |
709 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
710 | ||
711 | /* Make BGP update packet. */ | |
712 | if (CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_NEW_RCV)) | |
713 | bgp_packet_set_marker (s, BGP_MSG_ROUTE_REFRESH_NEW); | |
714 | else | |
715 | bgp_packet_set_marker (s, BGP_MSG_ROUTE_REFRESH_OLD); | |
716 | ||
717 | /* Encode Route Refresh message. */ | |
9cabb64b | 718 | stream_putw (s, pkt_afi); |
718e3744 | 719 | stream_putc (s, 0); |
9cabb64b | 720 | stream_putc (s, pkt_safi); |
718e3744 | 721 | |
722 | if (orf_type == ORF_TYPE_PREFIX | |
723 | || orf_type == ORF_TYPE_PREFIX_OLD) | |
724 | if (remove || filter->plist[FILTER_IN].plist) | |
725 | { | |
726 | u_int16_t orf_len; | |
727 | unsigned long orfp; | |
728 | ||
729 | orf_refresh = 1; | |
730 | stream_putc (s, when_to_refresh); | |
731 | stream_putc (s, orf_type); | |
9985f83c | 732 | orfp = stream_get_endp (s); |
718e3744 | 733 | stream_putw (s, 0); |
734 | ||
735 | if (remove) | |
736 | { | |
737 | UNSET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_PREFIX_SEND); | |
738 | stream_putc (s, ORF_COMMON_PART_REMOVE_ALL); | |
16286195 | 739 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 740 | zlog_debug ("%s sending REFRESH_REQ to remove ORF(%d) (%s) for afi/safi: %d/%d", |
718e3744 | 741 | peer->host, orf_type, |
742 | (when_to_refresh == REFRESH_DEFER ? "defer" : "immediate"), | |
9cabb64b | 743 | pkt_afi, pkt_safi); |
718e3744 | 744 | } |
745 | else | |
746 | { | |
747 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_PREFIX_SEND); | |
748 | prefix_bgp_orf_entry (s, filter->plist[FILTER_IN].plist, | |
749 | ORF_COMMON_PART_ADD, ORF_COMMON_PART_PERMIT, | |
750 | ORF_COMMON_PART_DENY); | |
16286195 | 751 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 752 | zlog_debug ("%s sending REFRESH_REQ with pfxlist ORF(%d) (%s) for afi/safi: %d/%d", |
718e3744 | 753 | peer->host, orf_type, |
754 | (when_to_refresh == REFRESH_DEFER ? "defer" : "immediate"), | |
9cabb64b | 755 | pkt_afi, pkt_safi); |
718e3744 | 756 | } |
757 | ||
758 | /* Total ORF Entry Len. */ | |
9985f83c | 759 | orf_len = stream_get_endp (s) - orfp - 2; |
718e3744 | 760 | stream_putw_at (s, orfp, orf_len); |
761 | } | |
762 | ||
763 | /* Set packet size. */ | |
ffd0c037 | 764 | (void)bgp_packet_set_size (s); |
718e3744 | 765 | |
16286195 | 766 | if (bgp_debug_neighbor_events(peer)) |
718e3744 | 767 | { |
768 | if (! orf_refresh) | |
6b51474d | 769 | zlog_debug ("%s sending REFRESH_REQ for afi/safi: %d/%d", |
9cabb64b | 770 | peer->host, pkt_afi, pkt_safi); |
718e3744 | 771 | } |
772 | ||
718e3744 | 773 | /* Add packet to the peer. */ |
af4b20d2 | 774 | bgp_packet_add (peer, s); |
718e3744 | 775 | |
eb821189 | 776 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 777 | } |
778 | ||
779 | /* Send capability message to the peer. */ | |
780 | void | |
781 | bgp_capability_send (struct peer *peer, afi_t afi, safi_t safi, | |
782 | int capability_code, int action) | |
783 | { | |
784 | struct stream *s; | |
9cabb64b | 785 | afi_t pkt_afi; |
786 | safi_t pkt_safi; | |
718e3744 | 787 | |
9cabb64b | 788 | /* Convert AFI, SAFI to values for packet. */ |
789 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
718e3744 | 790 | |
791 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
792 | ||
793 | /* Make BGP update packet. */ | |
794 | bgp_packet_set_marker (s, BGP_MSG_CAPABILITY); | |
795 | ||
796 | /* Encode MP_EXT capability. */ | |
797 | if (capability_code == CAPABILITY_CODE_MP) | |
798 | { | |
799 | stream_putc (s, action); | |
800 | stream_putc (s, CAPABILITY_CODE_MP); | |
801 | stream_putc (s, CAPABILITY_CODE_MP_LEN); | |
9cabb64b | 802 | stream_putw (s, pkt_afi); |
718e3744 | 803 | stream_putc (s, 0); |
9cabb64b | 804 | stream_putc (s, pkt_safi); |
718e3744 | 805 | |
16286195 | 806 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 807 | zlog_debug ("%s sending CAPABILITY has %s MP_EXT CAP for afi/safi: %d/%d", |
718e3744 | 808 | peer->host, action == CAPABILITY_ACTION_SET ? |
9cabb64b | 809 | "Advertising" : "Removing", pkt_afi, pkt_safi); |
718e3744 | 810 | } |
811 | ||
718e3744 | 812 | /* Set packet size. */ |
ffd0c037 | 813 | (void)bgp_packet_set_size (s); |
718e3744 | 814 | |
718e3744 | 815 | /* Add packet to the peer. */ |
af4b20d2 | 816 | bgp_packet_add (peer, s); |
718e3744 | 817 | |
eb821189 | 818 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 819 | } |
6b0655a2 | 820 | |
718e3744 | 821 | /* RFC1771 6.8 Connection collision detection. */ |
94f2b392 | 822 | static int |
eb821189 | 823 | bgp_collision_detect (struct peer *new, struct in_addr remote_id) |
718e3744 | 824 | { |
eb821189 | 825 | struct peer *peer; |
718e3744 | 826 | |
718e3744 | 827 | /* Upon receipt of an OPEN message, the local system must examine |
828 | all of its connections that are in the OpenConfirm state. A BGP | |
829 | speaker may also examine connections in an OpenSent state if it | |
830 | knows the BGP Identifier of the peer by means outside of the | |
831 | protocol. If among these connections there is a connection to a | |
832 | remote BGP speaker whose BGP Identifier equals the one in the | |
833 | OPEN message, then the local system performs the following | |
834 | collision resolution procedure: */ | |
835 | ||
1ff9a340 | 836 | if ((peer = new->doppelganger) != NULL) |
718e3744 | 837 | { |
1ff9a340 DS |
838 | /* Do not accept the new connection in Established or Clearing states. |
839 | * Note that a peer GR is handled by closing the existing connection | |
840 | * upon receipt of new one. | |
841 | */ | |
842 | if (peer->status == Established || peer->status == Clearing) | |
843 | { | |
844 | bgp_notify_send (new, BGP_NOTIFY_CEASE, | |
845 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
846 | return (-1); | |
847 | } | |
848 | else if ((peer->status == OpenConfirm) || (peer->status == OpenSent)) | |
eb821189 | 849 | { |
718e3744 | 850 | /* 1. The BGP Identifier of the local system is compared to |
851 | the BGP Identifier of the remote system (as specified in | |
852 | the OPEN message). */ | |
853 | ||
854 | if (ntohl (peer->local_id.s_addr) < ntohl (remote_id.s_addr)) | |
1ff9a340 DS |
855 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
856 | { | |
857 | /* 2. If the value of the local BGP Identifier is less | |
858 | than the remote one, the local system closes BGP | |
859 | connection that already exists (the one that is | |
860 | already in the OpenConfirm state), and accepts BGP | |
861 | connection initiated by the remote system. */ | |
862 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, | |
863 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
864 | return 1; | |
865 | } | |
866 | else | |
867 | { | |
868 | bgp_notify_send (new, BGP_NOTIFY_CEASE, | |
869 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
870 | return -1; | |
871 | } | |
718e3744 | 872 | else |
873 | { | |
874 | /* 3. Otherwise, the local system closes newly created | |
875 | BGP connection (the one associated with the newly | |
876 | received OPEN message), and continues to use the | |
877 | existing one (the one that is already in the | |
878 | OpenConfirm state). */ | |
1ff9a340 DS |
879 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
880 | { | |
881 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, | |
882 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
883 | return 1; | |
884 | } | |
885 | else | |
886 | { | |
887 | bgp_notify_send (new, BGP_NOTIFY_CEASE, | |
888 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
889 | return -1; | |
890 | } | |
718e3744 | 891 | } |
eb821189 | 892 | } |
893 | } | |
718e3744 | 894 | return 0; |
895 | } | |
896 | ||
94f2b392 | 897 | static int |
718e3744 | 898 | bgp_open_receive (struct peer *peer, bgp_size_t size) |
899 | { | |
900 | int ret; | |
901 | u_char version; | |
902 | u_char optlen; | |
903 | u_int16_t holdtime; | |
904 | u_int16_t send_holdtime; | |
905 | as_t remote_as; | |
0b2aa3a0 | 906 | as_t as4 = 0; |
718e3744 | 907 | struct in_addr remote_id; |
3b381c32 | 908 | int mp_capability; |
5228ad27 | 909 | u_int8_t notify_data_remote_as[2]; |
c9e3a6f4 | 910 | u_int8_t notify_data_remote_as4[4]; |
5228ad27 | 911 | u_int8_t notify_data_remote_id[4]; |
b184ccd8 | 912 | u_int16_t *holdtime_ptr; |
718e3744 | 913 | |
718e3744 | 914 | /* Parse open packet. */ |
915 | version = stream_getc (peer->ibuf); | |
916 | memcpy (notify_data_remote_as, stream_pnt (peer->ibuf), 2); | |
917 | remote_as = stream_getw (peer->ibuf); | |
ffd0c037 | 918 | holdtime_ptr = (u_int16_t *)stream_pnt (peer->ibuf); |
718e3744 | 919 | holdtime = stream_getw (peer->ibuf); |
920 | memcpy (notify_data_remote_id, stream_pnt (peer->ibuf), 4); | |
921 | remote_id.s_addr = stream_get_ipv4 (peer->ibuf); | |
922 | ||
923 | /* Receive OPEN message log */ | |
16286195 | 924 | if (bgp_debug_neighbor_events(peer)) |
aea339f7 | 925 | zlog_debug ("%s rcv OPEN, version %d, remote-as (in open) %u," |
0b2aa3a0 PJ |
926 | " holdtime %d, id %s", |
927 | peer->host, version, remote_as, holdtime, | |
928 | inet_ntoa (remote_id)); | |
929 | ||
930 | /* BEGIN to read the capability here, but dont do it yet */ | |
3b381c32 | 931 | mp_capability = 0; |
0b2aa3a0 PJ |
932 | optlen = stream_getc (peer->ibuf); |
933 | ||
934 | if (optlen != 0) | |
935 | { | |
09825025 | 936 | /* If not enough bytes, it is an error. */ |
937 | if (STREAM_READABLE(peer->ibuf) < optlen) | |
938 | { | |
939 | bgp_notify_send (peer, BGP_NOTIFY_OPEN_ERR, | |
940 | BGP_NOTIFY_OPEN_MALFORMED_ATTR); | |
941 | return -1; | |
942 | } | |
943 | ||
0b2aa3a0 PJ |
944 | /* We need the as4 capability value *right now* because |
945 | * if it is there, we have not got the remote_as yet, and without | |
946 | * that we do not know which peer is connecting to us now. | |
947 | */ | |
948 | as4 = peek_for_as4_capability (peer, optlen); | |
c9e3a6f4 | 949 | memcpy (notify_data_remote_as4, &as4, 4); |
0b2aa3a0 PJ |
950 | } |
951 | ||
952 | /* Just in case we have a silly peer who sends AS4 capability set to 0 */ | |
953 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV) && !as4) | |
954 | { | |
955 | zlog_err ("%s bad OPEN, got AS4 capability, but AS4 set to 0", | |
956 | peer->host); | |
c9e3a6f4 DS |
957 | bgp_notify_send_with_data (peer, |
958 | BGP_NOTIFY_OPEN_ERR, | |
959 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
960 | notify_data_remote_as4, 4); | |
0b2aa3a0 PJ |
961 | return -1; |
962 | } | |
963 | ||
964 | if (remote_as == BGP_AS_TRANS) | |
965 | { | |
966 | /* Take the AS4 from the capability. We must have received the | |
967 | * capability now! Otherwise we have a asn16 peer who uses | |
968 | * BGP_AS_TRANS, for some unknown reason. | |
969 | */ | |
970 | if (as4 == BGP_AS_TRANS) | |
971 | { | |
972 | zlog_err ("%s [AS4] NEW speaker using AS_TRANS for AS4, not allowed", | |
973 | peer->host); | |
c9e3a6f4 DS |
974 | bgp_notify_send_with_data (peer, |
975 | BGP_NOTIFY_OPEN_ERR, | |
976 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
977 | notify_data_remote_as4, 4); | |
0b2aa3a0 PJ |
978 | return -1; |
979 | } | |
980 | ||
981 | if (!as4 && BGP_DEBUG (as4, AS4)) | |
982 | zlog_debug ("%s [AS4] OPEN remote_as is AS_TRANS, but no AS4." | |
983 | " Odd, but proceeding.", peer->host); | |
984 | else if (as4 < BGP_AS_MAX && BGP_DEBUG (as4, AS4)) | |
0df7c91f | 985 | zlog_debug ("%s [AS4] OPEN remote_as is AS_TRANS, but AS4 (%u) fits " |
0b2aa3a0 PJ |
986 | "in 2-bytes, very odd peer.", peer->host, as4); |
987 | if (as4) | |
988 | remote_as = as4; | |
989 | } | |
990 | else | |
991 | { | |
992 | /* We may have a partner with AS4 who has an asno < BGP_AS_MAX */ | |
993 | /* If we have got the capability, peer->as4cap must match remote_as */ | |
994 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV) | |
995 | && as4 != remote_as) | |
996 | { | |
997 | /* raise error, log this, close session */ | |
998 | zlog_err ("%s bad OPEN, got AS4 capability, but remote_as %u" | |
999 | " mismatch with 16bit 'myasn' %u in open", | |
1000 | peer->host, as4, remote_as); | |
c9e3a6f4 DS |
1001 | bgp_notify_send_with_data (peer, |
1002 | BGP_NOTIFY_OPEN_ERR, | |
1003 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
1004 | notify_data_remote_as4, 4); | |
0b2aa3a0 PJ |
1005 | return -1; |
1006 | } | |
1007 | } | |
1008 | ||
718e3744 | 1009 | /* remote router-id check. */ |
58298ccd DS |
1010 | if (remote_id.s_addr == 0 |
1011 | || IPV4_CLASS_DE (ntohl (remote_id.s_addr)) | |
1012 | || ntohl (peer->local_id.s_addr) == ntohl (remote_id.s_addr)) | |
718e3744 | 1013 | { |
16286195 | 1014 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 1015 | zlog_debug ("%s bad OPEN, wrong router identifier %s", |
718e3744 | 1016 | peer->host, inet_ntoa (remote_id)); |
1017 | bgp_notify_send_with_data (peer, | |
1018 | BGP_NOTIFY_OPEN_ERR, | |
1019 | BGP_NOTIFY_OPEN_BAD_BGP_IDENT, | |
1020 | notify_data_remote_id, 4); | |
1021 | return -1; | |
1022 | } | |
1023 | ||
1024 | /* Set remote router-id */ | |
1025 | peer->remote_id = remote_id; | |
1026 | ||
1027 | /* Peer BGP version check. */ | |
1028 | if (version != BGP_VERSION_4) | |
1029 | { | |
a689e6a9 LR |
1030 | u_int16_t maxver = htons(BGP_VERSION_4); |
1031 | /* XXX this reply may not be correct if version < 4 XXX */ | |
16286195 | 1032 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 1033 | zlog_debug ("%s bad protocol version, remote requested %d, local request %d", |
718e3744 | 1034 | peer->host, version, BGP_VERSION_4); |
a689e6a9 | 1035 | /* Data must be in network byte order here */ |
718e3744 | 1036 | bgp_notify_send_with_data (peer, |
1037 | BGP_NOTIFY_OPEN_ERR, | |
1038 | BGP_NOTIFY_OPEN_UNSUP_VERSION, | |
a689e6a9 | 1039 | (u_int8_t *) &maxver, 2); |
718e3744 | 1040 | return -1; |
1041 | } | |
1042 | ||
1043 | /* Check neighbor as number. */ | |
f8cfafda DS |
1044 | if (peer->as_type == AS_UNSPECIFIED) |
1045 | { | |
1046 | if (bgp_debug_neighbor_events(peer)) | |
1047 | zlog_debug("%s bad OPEN, remote AS is unspecified currently", peer->host); | |
1048 | bgp_notify_send_with_data(peer, | |
1049 | BGP_NOTIFY_OPEN_ERR, | |
1050 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
1051 | notify_data_remote_as, 2); | |
1052 | return -1; | |
1053 | } | |
1054 | else if (peer->as_type == AS_INTERNAL) | |
0299c004 DS |
1055 | { |
1056 | if (remote_as != peer->bgp->as) | |
1057 | { | |
1058 | if (bgp_debug_neighbor_events(peer)) | |
1059 | zlog_debug ("%s bad OPEN, remote AS is %u, internal specified", | |
1060 | peer->host, remote_as); | |
1061 | bgp_notify_send_with_data (peer, | |
1062 | BGP_NOTIFY_OPEN_ERR, | |
1063 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
1064 | notify_data_remote_as, 2); | |
1065 | return -1; | |
1066 | } | |
1067 | peer->as = peer->local_as; | |
1068 | } | |
1069 | else if (peer->as_type == AS_EXTERNAL) | |
1070 | { | |
1071 | if (remote_as == peer->bgp->as) | |
1072 | { | |
1073 | if (bgp_debug_neighbor_events(peer)) | |
1074 | zlog_debug ("%s bad OPEN, remote AS is %u, external specified", | |
1075 | peer->host, remote_as); | |
1076 | bgp_notify_send_with_data (peer, | |
1077 | BGP_NOTIFY_OPEN_ERR, | |
1078 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
1079 | notify_data_remote_as, 2); | |
1080 | return -1; | |
1081 | } | |
1082 | peer->as = remote_as; | |
1083 | } | |
1084 | else if ((peer->as_type == AS_SPECIFIED) && (remote_as != peer->as)) | |
718e3744 | 1085 | { |
16286195 | 1086 | if (bgp_debug_neighbor_events(peer)) |
aea339f7 | 1087 | zlog_debug ("%s bad OPEN, remote AS is %u, expected %u", |
0299c004 DS |
1088 | peer->host, remote_as, peer->as); |
1089 | bgp_notify_send_with_data (peer, | |
1090 | BGP_NOTIFY_OPEN_ERR, | |
718e3744 | 1091 | BGP_NOTIFY_OPEN_BAD_PEER_AS, |
1092 | notify_data_remote_as, 2); | |
1093 | return -1; | |
1094 | } | |
1095 | ||
1096 | /* From the rfc: Upon receipt of an OPEN message, a BGP speaker MUST | |
1097 | calculate the value of the Hold Timer by using the smaller of its | |
1098 | configured Hold Time and the Hold Time received in the OPEN message. | |
1099 | The Hold Time MUST be either zero or at least three seconds. An | |
1100 | implementation may reject connections on the basis of the Hold Time. */ | |
1101 | ||
1102 | if (holdtime < 3 && holdtime != 0) | |
1103 | { | |
b184ccd8 DS |
1104 | bgp_notify_send_with_data (peer, |
1105 | BGP_NOTIFY_OPEN_ERR, | |
1106 | BGP_NOTIFY_OPEN_UNACEP_HOLDTIME, | |
ffd0c037 | 1107 | (u_char *)holdtime_ptr, 2); |
718e3744 | 1108 | return -1; |
1109 | } | |
1110 | ||
1111 | /* From the rfc: A reasonable maximum time between KEEPALIVE messages | |
1112 | would be one third of the Hold Time interval. KEEPALIVE messages | |
1113 | MUST NOT be sent more frequently than one per second. An | |
1114 | implementation MAY adjust the rate at which it sends KEEPALIVE | |
1115 | messages as a function of the Hold Time interval. */ | |
1116 | ||
1117 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
1118 | send_holdtime = peer->holdtime; | |
1119 | else | |
1120 | send_holdtime = peer->bgp->default_holdtime; | |
1121 | ||
1122 | if (holdtime < send_holdtime) | |
1123 | peer->v_holdtime = holdtime; | |
1124 | else | |
1125 | peer->v_holdtime = send_holdtime; | |
1126 | ||
1127 | peer->v_keepalive = peer->v_holdtime / 3; | |
1128 | ||
1129 | /* Open option part parse. */ | |
718e3744 | 1130 | if (optlen != 0) |
1131 | { | |
3b381c32 | 1132 | if ((ret = bgp_open_option_parse (peer, optlen, &mp_capability)) < 0) |
14051b36 | 1133 | return ret; |
718e3744 | 1134 | } |
1135 | else | |
1136 | { | |
16286195 | 1137 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 1138 | zlog_debug ("%s rcvd OPEN w/ OPTION parameter len: 0", |
718e3744 | 1139 | peer->host); |
1140 | } | |
1141 | ||
3b381c32 AS |
1142 | /* |
1143 | * Assume that the peer supports the locally configured set of | |
1144 | * AFI/SAFIs if the peer did not send us any Mulitiprotocol | |
1145 | * capabilities, or if 'override-capability' is configured. | |
1146 | */ | |
1147 | if (! mp_capability || | |
1148 | CHECK_FLAG (peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY)) | |
718e3744 | 1149 | { |
1150 | peer->afc_nego[AFI_IP][SAFI_UNICAST] = peer->afc[AFI_IP][SAFI_UNICAST]; | |
1151 | peer->afc_nego[AFI_IP][SAFI_MULTICAST] = peer->afc[AFI_IP][SAFI_MULTICAST]; | |
1152 | peer->afc_nego[AFI_IP6][SAFI_UNICAST] = peer->afc[AFI_IP6][SAFI_UNICAST]; | |
1153 | peer->afc_nego[AFI_IP6][SAFI_MULTICAST] = peer->afc[AFI_IP6][SAFI_MULTICAST]; | |
1154 | } | |
1155 | ||
1ff9a340 DS |
1156 | /* When collision is detected and this peer is closed. Retrun |
1157 | immidiately. */ | |
1158 | ret = bgp_collision_detect (peer, remote_id); | |
1159 | if (ret < 0) | |
1160 | return ret; | |
1161 | ||
718e3744 | 1162 | /* Get sockname. */ |
1ff9a340 DS |
1163 | if ((ret = bgp_getsockname (peer)) < 0) |
1164 | { | |
1165 | zlog_err("%s: bgp_getsockname() failed for peer: %s", __FUNCTION__, | |
1166 | peer->host); | |
1167 | return (ret); | |
1168 | } | |
718e3744 | 1169 | |
e33a4880 | 1170 | /* Verify valid local address present based on negotiated address-families. */ |
1171 | if (peer->afc_nego[AFI_IP][SAFI_UNICAST] || | |
1172 | peer->afc_nego[AFI_IP][SAFI_MULTICAST] || | |
587ff0fd LB |
1173 | peer->afc_nego[AFI_IP][SAFI_MPLS_VPN] || |
1174 | peer->afc_nego[AFI_IP][SAFI_ENCAP]) | |
e33a4880 | 1175 | { |
1176 | if (!peer->nexthop.v4.s_addr) | |
1177 | { | |
4d41dd8b | 1178 | #if defined (HAVE_CUMULUS) |
e33a4880 | 1179 | zlog_err ("%s: No local IPv4 addr resetting connection, fd %d", |
1180 | peer->host, peer->fd); | |
1181 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, BGP_NOTIFY_SUBCODE_UNSPECIFIC); | |
1182 | return -1; | |
1d808091 | 1183 | #endif |
e33a4880 | 1184 | } |
1185 | } | |
1186 | if (peer->afc_nego[AFI_IP6][SAFI_UNICAST] || | |
6407da5a | 1187 | peer->afc_nego[AFI_IP6][SAFI_MULTICAST] || |
587ff0fd LB |
1188 | peer->afc_nego[AFI_IP6][SAFI_MPLS_VPN] || |
1189 | peer->afc_nego[AFI_IP6][SAFI_ENCAP]) | |
e33a4880 | 1190 | { |
1191 | if (IN6_IS_ADDR_UNSPECIFIED (&peer->nexthop.v6_global)) | |
1192 | { | |
4d41dd8b | 1193 | #if defined (HAVE_CUMULUS) |
e33a4880 | 1194 | zlog_err ("%s: No local IPv6 addr resetting connection, fd %d", |
1195 | peer->host, peer->fd); | |
1196 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, BGP_NOTIFY_SUBCODE_UNSPECIFIC); | |
1197 | return -1; | |
1d808091 | 1198 | #endif |
e33a4880 | 1199 | } |
1200 | } | |
0cd0d979 | 1201 | peer->rtt = sockopt_tcp_rtt (peer->fd); |
e33a4880 | 1202 | |
1ff9a340 DS |
1203 | if ((ret = bgp_event_update(peer, Receive_OPEN_message)) < 0) |
1204 | { | |
1205 | zlog_err("%s: BGP event update failed for peer: %s", __FUNCTION__, | |
1206 | peer->host); | |
1207 | /* DD: bgp send notify and reset state */ | |
1208 | return (ret); | |
1209 | } | |
718e3744 | 1210 | |
1211 | peer->packet_size = 0; | |
1212 | if (peer->ibuf) | |
1213 | stream_reset (peer->ibuf); | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
f188f2c4 DS |
1218 | /* Called when there is a change in the EOR(implicit or explicit) status of a peer. |
1219 | Ends the update-delay if all expected peers are done with EORs. */ | |
1220 | void | |
1221 | bgp_check_update_delay(struct bgp *bgp) | |
1222 | { | |
1223 | struct listnode *node, *nnode; | |
ffd0c037 | 1224 | struct peer *peer = NULL; |
f188f2c4 | 1225 | |
16286195 | 1226 | if (bgp_debug_neighbor_events(peer)) |
f188f2c4 DS |
1227 | zlog_debug ("Checking update delay, T: %d R: %d I:%d E: %d", bgp->established, |
1228 | bgp->restarted_peers, bgp->implicit_eors, bgp->explicit_eors); | |
1229 | ||
1230 | if (bgp->established <= | |
1231 | bgp->restarted_peers + bgp->implicit_eors + bgp->explicit_eors) | |
1232 | { | |
1233 | /* This is an extra sanity check to make sure we wait for all the | |
1234 | eligible configured peers. This check is performed if establish wait | |
1235 | timer is on, or establish wait option is not given with the | |
1236 | update-delay command */ | |
1237 | if (bgp->t_establish_wait || | |
1238 | (bgp->v_establish_wait == bgp->v_update_delay)) | |
1239 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
1240 | { | |
1ff9a340 DS |
1241 | if (CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1242 | && !CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN) | |
f188f2c4 DS |
1243 | && !peer->update_delay_over) |
1244 | { | |
16286195 | 1245 | if (bgp_debug_neighbor_events(peer)) |
f188f2c4 DS |
1246 | zlog_debug (" Peer %s pending, continuing read-only mode", |
1247 | peer->host); | |
1248 | return; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | zlog_info ("Update delay ended, restarted: %d, EORs implicit: %d, explicit: %d", | |
1253 | bgp->restarted_peers, bgp->implicit_eors, bgp->explicit_eors); | |
1254 | bgp_update_delay_end(bgp); | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | /* Called if peer is known to have restarted. The restart-state bit in | |
1259 | Graceful-Restart capability is used for that */ | |
1260 | void | |
1261 | bgp_update_restarted_peers (struct peer *peer) | |
1262 | { | |
1263 | if (!bgp_update_delay_active(peer->bgp)) return; /* BGP update delay has ended */ | |
1264 | if (peer->update_delay_over) return; /* This peer has already been considered */ | |
1265 | ||
16286195 | 1266 | if (bgp_debug_neighbor_events(peer)) |
f188f2c4 DS |
1267 | zlog_debug ("Peer %s: Checking restarted", peer->host); |
1268 | ||
1269 | if (peer->status == Established) | |
1270 | { | |
1271 | peer->update_delay_over = 1; | |
1272 | peer->bgp->restarted_peers++; | |
1273 | bgp_check_update_delay(peer->bgp); | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* Called as peer receives a keep-alive. Determines if this occurence can be | |
1278 | taken as an implicit EOR for this peer. | |
1279 | NOTE: The very first keep-alive after the Established state of a peer is | |
1280 | considered implicit EOR for the update-delay purposes */ | |
1281 | void | |
1282 | bgp_update_implicit_eors (struct peer *peer) | |
1283 | { | |
1284 | if (!bgp_update_delay_active(peer->bgp)) return; /* BGP update delay has ended */ | |
1285 | if (peer->update_delay_over) return; /* This peer has already been considered */ | |
1286 | ||
16286195 | 1287 | if (bgp_debug_neighbor_events(peer)) |
f188f2c4 DS |
1288 | zlog_debug ("Peer %s: Checking implicit EORs", peer->host); |
1289 | ||
1290 | if (peer->status == Established) | |
1291 | { | |
1292 | peer->update_delay_over = 1; | |
1293 | peer->bgp->implicit_eors++; | |
1294 | bgp_check_update_delay(peer->bgp); | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | /* Should be called only when there is a change in the EOR_RECEIVED status | |
1299 | for any afi/safi on a peer */ | |
1300 | static void | |
1301 | bgp_update_explicit_eors (struct peer *peer) | |
1302 | { | |
1303 | afi_t afi; | |
1304 | safi_t safi; | |
1305 | ||
1306 | if (!bgp_update_delay_active(peer->bgp)) return; /* BGP update delay has ended */ | |
1307 | if (peer->update_delay_over) return; /* This peer has already been considered */ | |
1308 | ||
16286195 | 1309 | if (bgp_debug_neighbor_events(peer)) |
f188f2c4 DS |
1310 | zlog_debug ("Peer %s: Checking explicit EORs", peer->host); |
1311 | ||
1312 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
1313 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
1314 | { | |
1315 | if (peer->afc_nego[afi][safi] && | |
1316 | !CHECK_FLAG(peer->af_sflags[afi][safi], PEER_STATUS_EOR_RECEIVED)) | |
1317 | { | |
16286195 | 1318 | if (bgp_debug_neighbor_events(peer)) |
f188f2c4 DS |
1319 | zlog_debug (" afi %d safi %d didnt receive EOR", afi, safi); |
1320 | return; | |
1321 | } | |
1322 | } | |
1323 | ||
1324 | peer->update_delay_over = 1; | |
1325 | peer->bgp->explicit_eors++; | |
1326 | bgp_check_update_delay(peer->bgp); | |
1327 | } | |
1328 | ||
96e52474 PJ |
1329 | /* Frontend for NLRI parsing, to fan-out to AFI/SAFI specific parsers */ |
1330 | int | |
1331 | bgp_nlri_parse (struct peer *peer, struct attr *attr, struct bgp_nlri *packet) | |
1332 | { | |
1333 | switch (packet->safi) | |
1334 | { | |
1335 | case SAFI_UNICAST: | |
1336 | case SAFI_MULTICAST: | |
1337 | return bgp_nlri_parse_ip (peer, attr, packet); | |
1338 | case SAFI_MPLS_VPN: | |
96e52474 PJ |
1339 | return bgp_nlri_parse_vpn (peer, attr, packet); |
1340 | case SAFI_ENCAP: | |
1341 | return bgp_nlri_parse_encap (peer, attr, packet); | |
1342 | } | |
1343 | return -1; | |
1344 | } | |
1345 | ||
718e3744 | 1346 | /* Parse BGP Update packet and make attribute object. */ |
94f2b392 | 1347 | static int |
718e3744 | 1348 | bgp_update_receive (struct peer *peer, bgp_size_t size) |
1349 | { | |
96e52474 | 1350 | int ret, nlri_ret; |
718e3744 | 1351 | u_char *end; |
1352 | struct stream *s; | |
1353 | struct attr attr; | |
489d005a | 1354 | struct attr_extra extra; |
718e3744 | 1355 | bgp_size_t attribute_len; |
1356 | bgp_size_t update_len; | |
1357 | bgp_size_t withdraw_len; | |
718e3744 | 1358 | |
96e52474 PJ |
1359 | enum NLRI_TYPES { |
1360 | NLRI_UPDATE, | |
1361 | NLRI_WITHDRAW, | |
1362 | NLRI_MP_UPDATE, | |
1363 | NLRI_MP_WITHDRAW, | |
1364 | NLRI_TYPE_MAX | |
1365 | }; | |
1366 | struct bgp_nlri nlris[NLRI_TYPE_MAX]; | |
1367 | ||
718e3744 | 1368 | /* Status must be Established. */ |
1369 | if (peer->status != Established) | |
1370 | { | |
1371 | zlog_err ("%s [FSM] Update packet received under status %s", | |
1372 | peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
1373 | bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1374 | return -1; | |
1375 | } | |
1376 | ||
1377 | /* Set initial values. */ | |
1378 | memset (&attr, 0, sizeof (struct attr)); | |
489d005a | 1379 | memset (&extra, 0, sizeof (struct attr_extra)); |
96e52474 | 1380 | memset (&nlris, 0, sizeof (nlris)); |
489d005a | 1381 | attr.extra = &extra; |
16286195 DS |
1382 | memset (peer->rcvd_attr_str, 0, BUFSIZ); |
1383 | peer->rcvd_attr_printed = 0; | |
718e3744 | 1384 | |
1385 | s = peer->ibuf; | |
1386 | end = stream_pnt (s) + size; | |
1387 | ||
1388 | /* RFC1771 6.3 If the Unfeasible Routes Length or Total Attribute | |
1389 | Length is too large (i.e., if Unfeasible Routes Length + Total | |
1390 | Attribute Length + 23 exceeds the message Length), then the Error | |
1391 | Subcode is set to Malformed Attribute List. */ | |
1392 | if (stream_pnt (s) + 2 > end) | |
1393 | { | |
1394 | zlog_err ("%s [Error] Update packet error" | |
1395 | " (packet length is short for unfeasible length)", | |
1396 | peer->host); | |
1397 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1398 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1399 | return -1; | |
1400 | } | |
1401 | ||
1402 | /* Unfeasible Route Length. */ | |
1403 | withdraw_len = stream_getw (s); | |
1404 | ||
1405 | /* Unfeasible Route Length check. */ | |
1406 | if (stream_pnt (s) + withdraw_len > end) | |
1407 | { | |
1408 | zlog_err ("%s [Error] Update packet error" | |
1409 | " (packet unfeasible length overflow %d)", | |
1410 | peer->host, withdraw_len); | |
1411 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1412 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1413 | return -1; | |
1414 | } | |
1415 | ||
1416 | /* Unfeasible Route packet format check. */ | |
1417 | if (withdraw_len > 0) | |
1418 | { | |
96e52474 PJ |
1419 | nlris[NLRI_WITHDRAW].afi = AFI_IP; |
1420 | nlris[NLRI_WITHDRAW].safi = SAFI_UNICAST; | |
1421 | nlris[NLRI_WITHDRAW].nlri = stream_pnt (s); | |
1422 | nlris[NLRI_WITHDRAW].length = withdraw_len; | |
9985f83c | 1423 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1424 | } |
1425 | ||
1426 | /* Attribute total length check. */ | |
1427 | if (stream_pnt (s) + 2 > end) | |
1428 | { | |
1429 | zlog_warn ("%s [Error] Packet Error" | |
1430 | " (update packet is short for attribute length)", | |
1431 | peer->host); | |
1432 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1433 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1434 | return -1; | |
1435 | } | |
1436 | ||
1437 | /* Fetch attribute total length. */ | |
1438 | attribute_len = stream_getw (s); | |
1439 | ||
1440 | /* Attribute length check. */ | |
1441 | if (stream_pnt (s) + attribute_len > end) | |
1442 | { | |
1443 | zlog_warn ("%s [Error] Packet Error" | |
1444 | " (update packet attribute length overflow %d)", | |
1445 | peer->host, attribute_len); | |
1446 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1447 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1448 | return -1; | |
1449 | } | |
b881c707 PJ |
1450 | |
1451 | /* Certain attribute parsing errors should not be considered bad enough | |
1452 | * to reset the session for, most particularly any partial/optional | |
1453 | * attributes that have 'tunneled' over speakers that don't understand | |
1454 | * them. Instead we withdraw only the prefix concerned. | |
1455 | * | |
1456 | * Complicates the flow a little though.. | |
1457 | */ | |
1458 | bgp_attr_parse_ret_t attr_parse_ret = BGP_ATTR_PARSE_PROCEED; | |
1459 | /* This define morphs the update case into a withdraw when lower levels | |
1460 | * have signalled an error condition where this is best. | |
1461 | */ | |
1462 | #define NLRI_ATTR_ARG (attr_parse_ret != BGP_ATTR_PARSE_WITHDRAW ? &attr : NULL) | |
718e3744 | 1463 | |
1464 | /* Parse attribute when it exists. */ | |
1465 | if (attribute_len) | |
1466 | { | |
b881c707 | 1467 | attr_parse_ret = bgp_attr_parse (peer, &attr, attribute_len, |
96e52474 | 1468 | &nlris[NLRI_MP_UPDATE], &nlris[NLRI_MP_WITHDRAW]); |
b881c707 | 1469 | if (attr_parse_ret == BGP_ATTR_PARSE_ERROR) |
f80f838b DL |
1470 | { |
1471 | bgp_attr_unintern_sub (&attr); | |
1472 | return -1; | |
1473 | } | |
718e3744 | 1474 | } |
b881c707 | 1475 | |
718e3744 | 1476 | /* Logging the attribute. */ |
16286195 DS |
1477 | if (attr_parse_ret == BGP_ATTR_PARSE_WITHDRAW || |
1478 | BGP_DEBUG (update, UPDATE_IN) || | |
1479 | BGP_DEBUG (update, UPDATE_PREFIX)) | |
718e3744 | 1480 | { |
16286195 | 1481 | ret = bgp_dump_attr (peer, &attr, peer->rcvd_attr_str, BUFSIZ); |
b881c707 PJ |
1482 | |
1483 | if (attr_parse_ret == BGP_ATTR_PARSE_WITHDRAW) | |
16286195 DS |
1484 | zlog_err ("%s rcvd UPDATE with errors in attr(s)!! Withdrawing route.", |
1485 | peer->host); | |
e01f9cbb | 1486 | |
3f9c7369 | 1487 | if (ret && bgp_debug_update(peer, NULL, NULL, 1)) |
16286195 DS |
1488 | { |
1489 | zlog_debug ("%s rcvd UPDATE w/ attr: %s", peer->host, peer->rcvd_attr_str); | |
1490 | peer->rcvd_attr_printed = 1; | |
1491 | } | |
718e3744 | 1492 | } |
b881c707 | 1493 | |
718e3744 | 1494 | /* Network Layer Reachability Information. */ |
1495 | update_len = end - stream_pnt (s); | |
1496 | ||
1497 | if (update_len) | |
1498 | { | |
48a5452b | 1499 | /* Set NLRI portion to structure. */ |
96e52474 PJ |
1500 | nlris[NLRI_UPDATE].afi = AFI_IP; |
1501 | nlris[NLRI_UPDATE].safi = SAFI_UNICAST; | |
1502 | nlris[NLRI_UPDATE].nlri = stream_pnt (s); | |
1503 | nlris[NLRI_UPDATE].length = update_len; | |
9985f83c | 1504 | stream_forward_getp (s, update_len); |
718e3744 | 1505 | } |
1506 | ||
d889623f | 1507 | if (BGP_DEBUG (update, UPDATE_IN)) |
ebd12e62 PJ |
1508 | zlog_debug("%s rcvd UPDATE wlen %d attrlen %d alen %d", |
1509 | peer->host, withdraw_len, attribute_len, update_len); | |
d889623f | 1510 | |
96e52474 PJ |
1511 | /* Parse any given NLRIs */ |
1512 | for (int i = NLRI_UPDATE; i < NLRI_TYPE_MAX; i++) | |
718e3744 | 1513 | { |
8628876f PJ |
1514 | if (!nlris[i].nlri) |
1515 | continue; | |
1516 | ||
96e52474 PJ |
1517 | /* NLRI is processed iff the peer if configured for the specific afi/safi */ |
1518 | if (!peer->afc[nlris[i].afi][nlris[i].safi]) | |
1519 | { | |
1520 | zlog_info ("%s [Info] UPDATE for non-enabled AFI/SAFI %u/%u", | |
1521 | peer->host, nlris[i].afi, nlris[i].safi); | |
1522 | continue; | |
1523 | } | |
93406d87 | 1524 | |
96e52474 PJ |
1525 | /* EoR handled later */ |
1526 | if (nlris[i].length == 0) | |
1527 | continue; | |
e01f9cbb | 1528 | |
96e52474 PJ |
1529 | switch (i) |
1530 | { | |
1531 | case NLRI_UPDATE: | |
1532 | case NLRI_MP_UPDATE: | |
1533 | nlri_ret = bgp_nlri_parse (peer, NLRI_ATTR_ARG, &nlris[i]); | |
1534 | break; | |
1535 | case NLRI_WITHDRAW: | |
1536 | case NLRI_MP_WITHDRAW: | |
1537 | nlri_ret = bgp_nlri_parse (peer, NULL, &nlris[i]); | |
1538 | break; | |
1539 | default: | |
1540 | nlri_ret = -1; | |
1541 | } | |
93406d87 | 1542 | |
96e52474 PJ |
1543 | if (nlri_ret < 0) |
1544 | { | |
1545 | zlog_err("%s [Error] Error parsing NLRI", peer->host); | |
1546 | if (peer->status == Established) | |
1547 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1548 | i <= NLRI_WITHDRAW ? BGP_NOTIFY_UPDATE_INVAL_NETWORK | |
1549 | : BGP_NOTIFY_UPDATE_OPT_ATTR_ERR); | |
1550 | bgp_attr_unintern_sub (&attr); | |
1551 | return -1; | |
1552 | } | |
718e3744 | 1553 | } |
e01f9cbb | 1554 | |
96e52474 PJ |
1555 | /* EoR checks |
1556 | * | |
1557 | * Non-MP IPv4/Unicast EoR is a completely empty UPDATE | |
1558 | * and MP EoR should have only an empty MP_UNREACH | |
1559 | */ | |
1560 | if (!update_len && !withdraw_len | |
1561 | && nlris[NLRI_MP_UPDATE].length == 0) | |
718e3744 | 1562 | { |
96e52474 PJ |
1563 | afi_t afi = 0; |
1564 | safi_t safi; | |
16286195 | 1565 | |
96e52474 PJ |
1566 | /* Non-MP IPv4/Unicast is a completely emtpy UPDATE - already checked |
1567 | * update and withdraw NLRI lengths are 0. | |
1568 | */ | |
1569 | if (!attribute_len) | |
1570 | { | |
1571 | afi = AFI_IP; | |
1572 | safi = SAFI_UNICAST; | |
1573 | } | |
18ef625f | 1574 | else if (attr.flag & ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI) |
9cabb64b | 1575 | && nlris[NLRI_MP_WITHDRAW].length == 0) |
96e52474 PJ |
1576 | { |
1577 | afi = nlris[NLRI_MP_WITHDRAW].afi; | |
1578 | safi = nlris[NLRI_MP_WITHDRAW].safi; | |
1579 | } | |
e01f9cbb | 1580 | |
96e52474 PJ |
1581 | if (afi && peer->afc[afi][safi]) |
1582 | { | |
945c8fe9 | 1583 | /* End-of-RIB received */ |
96e52474 | 1584 | if (!CHECK_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_EOR_RECEIVED)) |
945c8fe9 | 1585 | { |
96e52474 PJ |
1586 | SET_FLAG (peer->af_sflags[afi][safi], |
1587 | PEER_STATUS_EOR_RECEIVED); | |
945c8fe9 LB |
1588 | bgp_update_explicit_eors(peer); |
1589 | } | |
1590 | ||
96e52474 PJ |
1591 | /* NSF delete stale route */ |
1592 | if (peer->nsf[afi][safi]) | |
1593 | bgp_clear_stale_route (peer, afi, safi); | |
587ff0fd LB |
1594 | |
1595 | if (bgp_debug_neighbor_events(peer)) | |
587ff0fd | 1596 | { |
96e52474 PJ |
1597 | zlog_debug ("rcvd End-of-RIB for %s from %s", |
1598 | afi_safi_print (afi, safi), peer->host); | |
587ff0fd | 1599 | } |
96e52474 | 1600 | } |
587ff0fd | 1601 | } |
718e3744 | 1602 | |
1603 | /* Everything is done. We unintern temporary structures which | |
1604 | interned in bgp_attr_parse(). */ | |
b881c707 | 1605 | bgp_attr_unintern_sub (&attr); |
489d005a | 1606 | |
718e3744 | 1607 | /* If peering is stopped due to some reason, do not generate BGP |
1608 | event. */ | |
1609 | if (peer->status != Established) | |
1610 | return 0; | |
1611 | ||
1612 | /* Increment packet counter. */ | |
1613 | peer->update_in++; | |
65957886 | 1614 | peer->update_time = bgp_clock (); |
718e3744 | 1615 | |
e2c38e6c | 1616 | /* Rearm holdtime timer */ |
6a4677b7 | 1617 | BGP_TIMER_OFF (peer->t_holdtime); |
e2c38e6c | 1618 | bgp_timer_set (peer); |
718e3744 | 1619 | |
1620 | return 0; | |
1621 | } | |
1622 | ||
1623 | /* Notify message treatment function. */ | |
94f2b392 | 1624 | static void |
718e3744 | 1625 | bgp_notify_receive (struct peer *peer, bgp_size_t size) |
1626 | { | |
1627 | struct bgp_notify bgp_notify; | |
1628 | ||
1629 | if (peer->notify.data) | |
1630 | { | |
1631 | XFREE (MTYPE_TMP, peer->notify.data); | |
1632 | peer->notify.data = NULL; | |
1633 | peer->notify.length = 0; | |
1634 | } | |
1635 | ||
1636 | bgp_notify.code = stream_getc (peer->ibuf); | |
1637 | bgp_notify.subcode = stream_getc (peer->ibuf); | |
1638 | bgp_notify.length = size - 2; | |
1639 | bgp_notify.data = NULL; | |
1640 | ||
1641 | /* Preserv notify code and sub code. */ | |
1642 | peer->notify.code = bgp_notify.code; | |
1643 | peer->notify.subcode = bgp_notify.subcode; | |
1644 | /* For further diagnostic record returned Data. */ | |
1645 | if (bgp_notify.length) | |
1646 | { | |
1647 | peer->notify.length = size - 2; | |
1648 | peer->notify.data = XMALLOC (MTYPE_TMP, size - 2); | |
1649 | memcpy (peer->notify.data, stream_pnt (peer->ibuf), size - 2); | |
1650 | } | |
1651 | ||
1652 | /* For debug */ | |
1653 | { | |
1654 | int i; | |
1655 | int first = 0; | |
1656 | char c[4]; | |
1657 | ||
1658 | if (bgp_notify.length) | |
1659 | { | |
1660 | bgp_notify.data = XMALLOC (MTYPE_TMP, bgp_notify.length * 3); | |
1661 | for (i = 0; i < bgp_notify.length; i++) | |
1662 | if (first) | |
1663 | { | |
1664 | sprintf (c, " %02x", stream_getc (peer->ibuf)); | |
1665 | strcat (bgp_notify.data, c); | |
1666 | } | |
1667 | else | |
1668 | { | |
1669 | first = 1; | |
1670 | sprintf (c, "%02x", stream_getc (peer->ibuf)); | |
1671 | strcpy (bgp_notify.data, c); | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | bgp_notify_print(peer, &bgp_notify, "received"); | |
1676 | if (bgp_notify.data) | |
9e08021c DW |
1677 | { |
1678 | XFREE (MTYPE_TMP, bgp_notify.data); | |
1679 | bgp_notify.data = NULL; | |
1680 | bgp_notify.length = 0; | |
1681 | } | |
718e3744 | 1682 | } |
1683 | ||
1684 | /* peer count update */ | |
1685 | peer->notify_in++; | |
1686 | ||
3a8c7ba1 | 1687 | peer->last_reset = PEER_DOWN_NOTIFY_RECEIVED; |
e0701b79 | 1688 | |
718e3744 | 1689 | /* We have to check for Notify with Unsupported Optional Parameter. |
1690 | in that case we fallback to open without the capability option. | |
1691 | But this done in bgp_stop. We just mark it here to avoid changing | |
1692 | the fsm tables. */ | |
1693 | if (bgp_notify.code == BGP_NOTIFY_OPEN_ERR && | |
1694 | bgp_notify.subcode == BGP_NOTIFY_OPEN_UNSUP_PARAM ) | |
1695 | UNSET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1696 | ||
718e3744 | 1697 | BGP_EVENT_ADD (peer, Receive_NOTIFICATION_message); |
1698 | } | |
1699 | ||
1700 | /* Keepalive treatment function -- get keepalive send keepalive */ | |
94f2b392 | 1701 | static void |
718e3744 | 1702 | bgp_keepalive_receive (struct peer *peer, bgp_size_t size) |
1703 | { | |
16286195 | 1704 | if (bgp_debug_keepalive(peer)) |
6b51474d | 1705 | zlog_debug ("%s KEEPALIVE rcvd", peer->host); |
718e3744 | 1706 | |
1707 | BGP_EVENT_ADD (peer, Receive_KEEPALIVE_message); | |
1708 | } | |
1709 | ||
1710 | /* Route refresh message is received. */ | |
94f2b392 | 1711 | static void |
718e3744 | 1712 | bgp_route_refresh_receive (struct peer *peer, bgp_size_t size) |
1713 | { | |
9cabb64b | 1714 | afi_t pkt_afi, afi; |
1715 | safi_t pkt_safi, safi; | |
718e3744 | 1716 | struct stream *s; |
b3657166 | 1717 | struct peer_af *paf; |
40d2700d DW |
1718 | struct update_group *updgrp; |
1719 | struct peer *updgrp_peer; | |
718e3744 | 1720 | |
1721 | /* If peer does not have the capability, send notification. */ | |
1722 | if (! CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_ADV)) | |
1723 | { | |
16286195 | 1724 | zlog_err ("%s [Error] BGP route refresh is not enabled", |
718e3744 | 1725 | peer->host); |
1726 | bgp_notify_send (peer, | |
1727 | BGP_NOTIFY_HEADER_ERR, | |
1728 | BGP_NOTIFY_HEADER_BAD_MESTYPE); | |
1729 | return; | |
1730 | } | |
1731 | ||
1732 | /* Status must be Established. */ | |
1733 | if (peer->status != Established) | |
1734 | { | |
16286195 | 1735 | zlog_err ("%s [Error] Route refresh packet received under status %s", |
718e3744 | 1736 | peer->host, LOOKUP (bgp_status_msg, peer->status)); |
1737 | bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1738 | return; | |
1739 | } | |
1740 | ||
1741 | s = peer->ibuf; | |
1742 | ||
1743 | /* Parse packet. */ | |
9cabb64b | 1744 | pkt_afi = stream_getw (s); |
ffd0c037 | 1745 | (void)stream_getc (s); |
9cabb64b | 1746 | pkt_safi = stream_getc (s); |
718e3744 | 1747 | |
3f9c7369 | 1748 | if (bgp_debug_update(peer, NULL, NULL, 0)) |
6b51474d | 1749 | zlog_debug ("%s rcvd REFRESH_REQ for afi/safi: %d/%d", |
9cabb64b | 1750 | peer->host, pkt_afi, pkt_safi); |
718e3744 | 1751 | |
9cabb64b | 1752 | /* Convert AFI, SAFI to internal values and check. */ |
1753 | if (bgp_map_afi_safi_iana2int (pkt_afi, pkt_safi, &afi, &safi)) | |
718e3744 | 1754 | { |
16286195 | 1755 | zlog_info ("%s REFRESH_REQ for unrecognized afi/safi: %d/%d - ignored", |
9cabb64b | 1756 | peer->host, pkt_afi, pkt_safi); |
718e3744 | 1757 | return; |
1758 | } | |
1759 | ||
718e3744 | 1760 | if (size != BGP_MSG_ROUTE_REFRESH_MIN_SIZE - BGP_HEADER_SIZE) |
1761 | { | |
1762 | u_char *end; | |
1763 | u_char when_to_refresh; | |
1764 | u_char orf_type; | |
1765 | u_int16_t orf_len; | |
1766 | ||
1767 | if (size - (BGP_MSG_ROUTE_REFRESH_MIN_SIZE - BGP_HEADER_SIZE) < 5) | |
1768 | { | |
1769 | zlog_info ("%s ORF route refresh length error", peer->host); | |
1770 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
1771 | return; | |
1772 | } | |
1773 | ||
1774 | when_to_refresh = stream_getc (s); | |
1775 | end = stream_pnt (s) + (size - 5); | |
1776 | ||
370b64a2 | 1777 | while ((stream_pnt (s) + 2) < end) |
718e3744 | 1778 | { |
1779 | orf_type = stream_getc (s); | |
1780 | orf_len = stream_getw (s); | |
370b64a2 PJ |
1781 | |
1782 | /* orf_len in bounds? */ | |
1783 | if ((stream_pnt (s) + orf_len) > end) | |
1784 | break; /* XXX: Notify instead?? */ | |
718e3744 | 1785 | if (orf_type == ORF_TYPE_PREFIX |
1786 | || orf_type == ORF_TYPE_PREFIX_OLD) | |
1787 | { | |
1f9a9fff PJ |
1788 | uint8_t *p_pnt = stream_pnt (s); |
1789 | uint8_t *p_end = stream_pnt (s) + orf_len; | |
718e3744 | 1790 | struct orf_prefix orfp; |
1791 | u_char common = 0; | |
1792 | u_int32_t seq; | |
1793 | int psize; | |
1794 | char name[BUFSIZ]; | |
ffd0c037 | 1795 | int ret = CMD_SUCCESS; |
718e3744 | 1796 | |
16286195 | 1797 | if (bgp_debug_neighbor_events(peer)) |
718e3744 | 1798 | { |
6b51474d | 1799 | zlog_debug ("%s rcvd Prefixlist ORF(%d) length %d", |
718e3744 | 1800 | peer->host, orf_type, orf_len); |
1801 | } | |
1802 | ||
370b64a2 PJ |
1803 | /* we're going to read at least 1 byte of common ORF header, |
1804 | * and 7 bytes of ORF Address-filter entry from the stream | |
1805 | */ | |
1806 | if (orf_len < 7) | |
1807 | break; | |
1808 | ||
718e3744 | 1809 | /* ORF prefix-list name */ |
1810 | sprintf (name, "%s.%d.%d", peer->host, afi, safi); | |
1811 | ||
1812 | while (p_pnt < p_end) | |
1813 | { | |
d64379e8 CH |
1814 | /* If the ORF entry is malformed, want to read as much of it |
1815 | * as possible without going beyond the bounds of the entry, | |
1816 | * to maximise debug information. | |
1817 | */ | |
fdbc8e77 | 1818 | int ok; |
718e3744 | 1819 | memset (&orfp, 0, sizeof (struct orf_prefix)); |
1820 | common = *p_pnt++; | |
d64379e8 | 1821 | /* after ++: p_pnt <= p_end */ |
718e3744 | 1822 | if (common & ORF_COMMON_PART_REMOVE_ALL) |
1823 | { | |
16286195 | 1824 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 1825 | zlog_debug ("%s rcvd Remove-All pfxlist ORF request", peer->host); |
c7da3d50 | 1826 | prefix_bgp_orf_remove_all (afi, name); |
718e3744 | 1827 | break; |
1828 | } | |
ffd0c037 | 1829 | ok = ((u_int32_t)(p_end - p_pnt) >= sizeof(u_int32_t)) ; |
bb915f5f | 1830 | if (ok) |
d64379e8 | 1831 | { |
fdbc8e77 PJ |
1832 | memcpy (&seq, p_pnt, sizeof (u_int32_t)); |
1833 | p_pnt += sizeof (u_int32_t); | |
1834 | orfp.seq = ntohl (seq); | |
d64379e8 CH |
1835 | } |
1836 | else | |
1837 | p_pnt = p_end ; | |
1838 | ||
1839 | if ((ok = (p_pnt < p_end))) | |
1840 | orfp.ge = *p_pnt++ ; /* value checked in prefix_bgp_orf_set() */ | |
1841 | if ((ok = (p_pnt < p_end))) | |
1842 | orfp.le = *p_pnt++ ; /* value checked in prefix_bgp_orf_set() */ | |
1843 | if ((ok = (p_pnt < p_end))) | |
1844 | orfp.p.prefixlen = *p_pnt++ ; | |
1845 | orfp.p.family = afi2family (afi); /* afi checked already */ | |
1846 | ||
1847 | psize = PSIZE (orfp.p.prefixlen); /* 0 if not ok */ | |
1848 | if (psize > prefix_blen(&orfp.p)) /* valid for family ? */ | |
1849 | { | |
1850 | ok = 0 ; | |
1851 | psize = prefix_blen(&orfp.p) ; | |
1852 | } | |
1853 | if (psize > (p_end - p_pnt)) /* valid for packet ? */ | |
1854 | { | |
1855 | ok = 0 ; | |
1856 | psize = p_end - p_pnt ; | |
1857 | } | |
1858 | ||
1859 | if (psize > 0) | |
1860 | memcpy (&orfp.p.u.prefix, p_pnt, psize); | |
718e3744 | 1861 | p_pnt += psize; |
1862 | ||
16286195 | 1863 | if (bgp_debug_neighbor_events(peer)) |
14542f3e JBD |
1864 | { |
1865 | char buf[INET6_BUFSIZ]; | |
1866 | ||
1867 | zlog_debug ("%s rcvd %s %s seq %u %s/%d ge %d le %d%s", | |
1868 | peer->host, | |
1869 | (common & ORF_COMMON_PART_REMOVE ? "Remove" : "Add"), | |
1870 | (common & ORF_COMMON_PART_DENY ? "deny" : "permit"), | |
1871 | orfp.seq, | |
1872 | inet_ntop (orfp.p.family, &orfp.p.u.prefix, buf, INET6_BUFSIZ), | |
1873 | orfp.p.prefixlen, orfp.ge, orfp.le, | |
1874 | ok ? "" : " MALFORMED"); | |
1875 | } | |
1876 | ||
d64379e8 | 1877 | if (ok) |
fdbc8e77 PJ |
1878 | ret = prefix_bgp_orf_set (name, afi, &orfp, |
1879 | (common & ORF_COMMON_PART_DENY ? 0 : 1 ), | |
1880 | (common & ORF_COMMON_PART_REMOVE ? 0 : 1)); | |
718e3744 | 1881 | |
1f9a9fff | 1882 | if (!ok || (ok && ret != CMD_SUCCESS)) |
718e3744 | 1883 | { |
16286195 DS |
1884 | zlog_info ("%s Received misformatted prefixlist ORF." |
1885 | " Remove All pfxlist", peer->host); | |
c7da3d50 | 1886 | prefix_bgp_orf_remove_all (afi, name); |
718e3744 | 1887 | break; |
1888 | } | |
1889 | } | |
40d2700d DW |
1890 | |
1891 | peer->orf_plist[afi][safi] = prefix_bgp_orf_lookup (afi, name); | |
718e3744 | 1892 | } |
9985f83c | 1893 | stream_forward_getp (s, orf_len); |
718e3744 | 1894 | } |
16286195 | 1895 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 1896 | zlog_debug ("%s rcvd Refresh %s ORF request", peer->host, |
718e3744 | 1897 | when_to_refresh == REFRESH_DEFER ? "Defer" : "Immediate"); |
1898 | if (when_to_refresh == REFRESH_DEFER) | |
1899 | return; | |
1900 | } | |
1901 | ||
1902 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
1903 | if (CHECK_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH)) | |
1904 | UNSET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
1905 | ||
b3657166 | 1906 | paf = peer_af_find (peer, afi, safi); |
40d2700d DW |
1907 | if (paf && paf->subgroup) |
1908 | { | |
1909 | if (peer->orf_plist[afi][safi]) | |
1910 | { | |
1911 | updgrp = PAF_UPDGRP(paf); | |
1912 | updgrp_peer = UPDGRP_PEER(updgrp); | |
1913 | updgrp_peer->orf_plist[afi][safi] = peer->orf_plist[afi][safi]; | |
1914 | } | |
1915 | ||
1916 | /* If the peer is configured for default-originate clear the | |
1917 | * SUBGRP_STATUS_DEFAULT_ORIGINATE flag so that we will re-advertise the | |
1918 | * default | |
1919 | */ | |
1920 | if (CHECK_FLAG (paf->subgroup->sflags, SUBGRP_STATUS_DEFAULT_ORIGINATE)) | |
1921 | UNSET_FLAG (paf->subgroup->sflags, SUBGRP_STATUS_DEFAULT_ORIGINATE); | |
1922 | } | |
b3657166 | 1923 | |
718e3744 | 1924 | /* Perform route refreshment to the peer */ |
1925 | bgp_announce_route (peer, afi, safi); | |
1926 | } | |
1927 | ||
94f2b392 | 1928 | static int |
718e3744 | 1929 | bgp_capability_msg_parse (struct peer *peer, u_char *pnt, bgp_size_t length) |
1930 | { | |
1931 | u_char *end; | |
6d58272b PJ |
1932 | struct capability_mp_data mpc; |
1933 | struct capability_header *hdr; | |
718e3744 | 1934 | u_char action; |
9cabb64b | 1935 | afi_t pkt_afi, afi; |
1936 | safi_t pkt_safi, safi; | |
718e3744 | 1937 | |
718e3744 | 1938 | end = pnt + length; |
1939 | ||
1940 | while (pnt < end) | |
6d58272b | 1941 | { |
718e3744 | 1942 | /* We need at least action, capability code and capability length. */ |
1943 | if (pnt + 3 > end) | |
1944 | { | |
1945 | zlog_info ("%s Capability length error", peer->host); | |
1946 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
1947 | return -1; | |
1948 | } | |
718e3744 | 1949 | action = *pnt; |
6d58272b PJ |
1950 | hdr = (struct capability_header *)(pnt + 1); |
1951 | ||
718e3744 | 1952 | /* Action value check. */ |
1953 | if (action != CAPABILITY_ACTION_SET | |
1954 | && action != CAPABILITY_ACTION_UNSET) | |
1955 | { | |
1956 | zlog_info ("%s Capability Action Value error %d", | |
1957 | peer->host, action); | |
1958 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
1959 | return -1; | |
1960 | } | |
1961 | ||
16286195 | 1962 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 1963 | zlog_debug ("%s CAPABILITY has action: %d, code: %u, length %u", |
6d58272b | 1964 | peer->host, action, hdr->code, hdr->length); |
718e3744 | 1965 | |
1966 | /* Capability length check. */ | |
6d58272b | 1967 | if ((pnt + hdr->length + 3) > end) |
718e3744 | 1968 | { |
1969 | zlog_info ("%s Capability length error", peer->host); | |
1970 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
1971 | return -1; | |
1972 | } | |
1973 | ||
6d58272b PJ |
1974 | /* Fetch structure to the byte stream. */ |
1975 | memcpy (&mpc, pnt + 3, sizeof (struct capability_mp_data)); | |
1976 | ||
718e3744 | 1977 | /* We know MP Capability Code. */ |
6d58272b | 1978 | if (hdr->code == CAPABILITY_CODE_MP) |
718e3744 | 1979 | { |
9cabb64b | 1980 | pkt_afi = ntohs (mpc.afi); |
1981 | pkt_safi = mpc.safi; | |
718e3744 | 1982 | |
1983 | /* Ignore capability when override-capability is set. */ | |
1984 | if (CHECK_FLAG (peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY)) | |
1985 | continue; | |
6d58272b | 1986 | |
9cabb64b | 1987 | /* Convert AFI, SAFI to internal values. */ |
1988 | if (bgp_map_afi_safi_iana2int (pkt_afi, pkt_safi, &afi, &safi)) | |
6d58272b | 1989 | { |
16286195 | 1990 | if (bgp_debug_neighbor_events(peer)) |
0b2aa3a0 | 1991 | zlog_debug ("%s Dynamic Capability MP_EXT afi/safi invalid " |
9cabb64b | 1992 | "(%u/%u)", peer->host, pkt_afi, pkt_safi); |
6d58272b PJ |
1993 | continue; |
1994 | } | |
1995 | ||
718e3744 | 1996 | /* Address family check. */ |
16286195 | 1997 | if (bgp_debug_neighbor_events(peer)) |
6d58272b PJ |
1998 | zlog_debug ("%s CAPABILITY has %s MP_EXT CAP for afi/safi: %u/%u", |
1999 | peer->host, | |
2000 | action == CAPABILITY_ACTION_SET | |
2001 | ? "Advertising" : "Removing", | |
9cabb64b | 2002 | pkt_afi, pkt_safi); |
6d58272b PJ |
2003 | |
2004 | if (action == CAPABILITY_ACTION_SET) | |
2005 | { | |
2006 | peer->afc_recv[afi][safi] = 1; | |
2007 | if (peer->afc[afi][safi]) | |
2008 | { | |
2009 | peer->afc_nego[afi][safi] = 1; | |
2010 | bgp_announce_route (peer, afi, safi); | |
2011 | } | |
2012 | } | |
2013 | else | |
2014 | { | |
2015 | peer->afc_recv[afi][safi] = 0; | |
2016 | peer->afc_nego[afi][safi] = 0; | |
2017 | ||
2018 | if (peer_active_nego (peer)) | |
2a3d5731 | 2019 | bgp_clear_route (peer, afi, safi); |
6d58272b PJ |
2020 | else |
2021 | BGP_EVENT_ADD (peer, BGP_Stop); | |
2022 | } | |
718e3744 | 2023 | } |
718e3744 | 2024 | else |
2025 | { | |
2026 | zlog_warn ("%s unrecognized capability code: %d - ignored", | |
6d58272b | 2027 | peer->host, hdr->code); |
718e3744 | 2028 | } |
6d58272b | 2029 | pnt += hdr->length + 3; |
718e3744 | 2030 | } |
2031 | return 0; | |
2032 | } | |
2033 | ||
01b7ce2d PJ |
2034 | /* Dynamic Capability is received. |
2035 | * | |
2036 | * This is exported for unit-test purposes | |
2037 | */ | |
6d58272b | 2038 | int |
718e3744 | 2039 | bgp_capability_receive (struct peer *peer, bgp_size_t size) |
2040 | { | |
2041 | u_char *pnt; | |
718e3744 | 2042 | |
2043 | /* Fetch pointer. */ | |
2044 | pnt = stream_pnt (peer->ibuf); | |
2045 | ||
16286195 | 2046 | if (bgp_debug_neighbor_events(peer)) |
6b51474d | 2047 | zlog_debug ("%s rcv CAPABILITY", peer->host); |
718e3744 | 2048 | |
2049 | /* If peer does not have the capability, send notification. */ | |
2050 | if (! CHECK_FLAG (peer->cap, PEER_CAP_DYNAMIC_ADV)) | |
2051 | { | |
16286195 | 2052 | zlog_err ("%s [Error] BGP dynamic capability is not enabled", |
718e3744 | 2053 | peer->host); |
2054 | bgp_notify_send (peer, | |
2055 | BGP_NOTIFY_HEADER_ERR, | |
2056 | BGP_NOTIFY_HEADER_BAD_MESTYPE); | |
0b2aa3a0 | 2057 | return -1; |
718e3744 | 2058 | } |
2059 | ||
2060 | /* Status must be Established. */ | |
2061 | if (peer->status != Established) | |
2062 | { | |
16286195 DS |
2063 | zlog_err ("%s [Error] Dynamic capability packet received under status %s", |
2064 | peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
718e3744 | 2065 | bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0); |
0b2aa3a0 | 2066 | return -1; |
718e3744 | 2067 | } |
2068 | ||
2069 | /* Parse packet. */ | |
6d58272b | 2070 | return bgp_capability_msg_parse (peer, pnt, size); |
718e3744 | 2071 | } |
6b0655a2 | 2072 | |
718e3744 | 2073 | /* BGP read utility function. */ |
94f2b392 | 2074 | static int |
718e3744 | 2075 | bgp_read_packet (struct peer *peer) |
2076 | { | |
2077 | int nbytes; | |
2078 | int readsize; | |
2079 | ||
9985f83c | 2080 | readsize = peer->packet_size - stream_get_endp (peer->ibuf); |
718e3744 | 2081 | |
2082 | /* If size is zero then return. */ | |
2083 | if (! readsize) | |
2084 | return 0; | |
2085 | ||
2086 | /* Read packet from fd. */ | |
35398589 | 2087 | nbytes = stream_read_try (peer->ibuf, peer->fd, readsize); |
718e3744 | 2088 | |
2089 | /* If read byte is smaller than zero then error occured. */ | |
2090 | if (nbytes < 0) | |
2091 | { | |
35398589 SH |
2092 | /* Transient error should retry */ |
2093 | if (nbytes == -2) | |
718e3744 | 2094 | return -1; |
2095 | ||
16286195 DS |
2096 | zlog_err ("%s [Error] bgp_read_packet error: %s", |
2097 | peer->host, safe_strerror (errno)); | |
93406d87 | 2098 | |
2099 | if (peer->status == Established) | |
2100 | { | |
2101 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_MODE)) | |
2102 | { | |
2103 | peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
2104 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
2105 | } | |
2106 | else | |
2107 | peer->last_reset = PEER_DOWN_CLOSE_SESSION; | |
2108 | } | |
2109 | ||
718e3744 | 2110 | BGP_EVENT_ADD (peer, TCP_fatal_error); |
2111 | return -1; | |
2112 | } | |
2113 | ||
2114 | /* When read byte is zero : clear bgp peer and return */ | |
2115 | if (nbytes == 0) | |
2116 | { | |
16286195 DS |
2117 | if (bgp_debug_neighbor_events(peer)) |
2118 | zlog_debug ("%s [Event] BGP connection closed fd %d", | |
2119 | peer->host, peer->fd); | |
e0701b79 | 2120 | |
2121 | if (peer->status == Established) | |
93406d87 | 2122 | { |
2123 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_MODE)) | |
2124 | { | |
2125 | peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
2126 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
2127 | } | |
2128 | else | |
2129 | peer->last_reset = PEER_DOWN_CLOSE_SESSION; | |
2130 | } | |
e0701b79 | 2131 | |
718e3744 | 2132 | BGP_EVENT_ADD (peer, TCP_connection_closed); |
2133 | return -1; | |
2134 | } | |
2135 | ||
2136 | /* We read partial packet. */ | |
9985f83c | 2137 | if (stream_get_endp (peer->ibuf) != peer->packet_size) |
718e3744 | 2138 | return -1; |
2139 | ||
2140 | return 0; | |
2141 | } | |
2142 | ||
2143 | /* Marker check. */ | |
94f2b392 | 2144 | static int |
718e3744 | 2145 | bgp_marker_all_one (struct stream *s, int length) |
2146 | { | |
2147 | int i; | |
2148 | ||
2149 | for (i = 0; i < length; i++) | |
2150 | if (s->data[i] != 0xff) | |
2151 | return 0; | |
2152 | ||
2153 | return 1; | |
2154 | } | |
2155 | ||
d61c1bbd SH |
2156 | /* Recent thread time. |
2157 | On same clock base as bgp_clock (MONOTONIC) | |
2158 | but can be time of last context switch to bgp_read thread. */ | |
2159 | static time_t | |
2160 | bgp_recent_clock (void) | |
2161 | { | |
2162 | return recent_relative_time().tv_sec; | |
2163 | } | |
2164 | ||
718e3744 | 2165 | /* Starting point of packet process function. */ |
2166 | int | |
2167 | bgp_read (struct thread *thread) | |
2168 | { | |
2169 | int ret; | |
2170 | u_char type = 0; | |
2171 | struct peer *peer; | |
2172 | bgp_size_t size; | |
2173 | char notify_data_length[2]; | |
d6661008 | 2174 | u_int32_t notify_out; |
718e3744 | 2175 | |
2176 | /* Yes first of all get peer pointer. */ | |
2177 | peer = THREAD_ARG (thread); | |
2178 | peer->t_read = NULL; | |
2179 | ||
d6661008 DS |
2180 | /* Note notify_out so we can check later to see if we sent another one */ |
2181 | notify_out = peer->notify_out; | |
2182 | ||
718e3744 | 2183 | /* For non-blocking IO check. */ |
2184 | if (peer->status == Connect) | |
2185 | { | |
fc9a856f | 2186 | bgp_connect_check (peer, 1); |
718e3744 | 2187 | goto done; |
2188 | } | |
2189 | else | |
2190 | { | |
eb821189 | 2191 | if (peer->fd < 0) |
718e3744 | 2192 | { |
eb821189 | 2193 | zlog_err ("bgp_read peer's fd is negative value %d", peer->fd); |
718e3744 | 2194 | return -1; |
2195 | } | |
eb821189 | 2196 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
718e3744 | 2197 | } |
2198 | ||
2199 | /* Read packet header to determine type of the packet */ | |
2200 | if (peer->packet_size == 0) | |
2201 | peer->packet_size = BGP_HEADER_SIZE; | |
2202 | ||
9985f83c | 2203 | if (stream_get_endp (peer->ibuf) < BGP_HEADER_SIZE) |
718e3744 | 2204 | { |
2205 | ret = bgp_read_packet (peer); | |
2206 | ||
2207 | /* Header read error or partial read packet. */ | |
2208 | if (ret < 0) | |
2209 | goto done; | |
2210 | ||
2211 | /* Get size and type. */ | |
9985f83c | 2212 | stream_forward_getp (peer->ibuf, BGP_MARKER_SIZE); |
718e3744 | 2213 | memcpy (notify_data_length, stream_pnt (peer->ibuf), 2); |
2214 | size = stream_getw (peer->ibuf); | |
2215 | type = stream_getc (peer->ibuf); | |
2216 | ||
718e3744 | 2217 | /* Marker check */ |
f5ba3874 | 2218 | if (((type == BGP_MSG_OPEN) || (type == BGP_MSG_KEEPALIVE)) |
718e3744 | 2219 | && ! bgp_marker_all_one (peer->ibuf, BGP_MARKER_SIZE)) |
2220 | { | |
2221 | bgp_notify_send (peer, | |
2222 | BGP_NOTIFY_HEADER_ERR, | |
2223 | BGP_NOTIFY_HEADER_NOT_SYNC); | |
2224 | goto done; | |
2225 | } | |
2226 | ||
2227 | /* BGP type check. */ | |
2228 | if (type != BGP_MSG_OPEN && type != BGP_MSG_UPDATE | |
2229 | && type != BGP_MSG_NOTIFY && type != BGP_MSG_KEEPALIVE | |
2230 | && type != BGP_MSG_ROUTE_REFRESH_NEW | |
2231 | && type != BGP_MSG_ROUTE_REFRESH_OLD | |
2232 | && type != BGP_MSG_CAPABILITY) | |
2233 | { | |
16286195 DS |
2234 | if (bgp_debug_neighbor_events(peer)) |
2235 | zlog_debug ("%s unknown message type 0x%02x", | |
2236 | peer->host, type); | |
718e3744 | 2237 | bgp_notify_send_with_data (peer, |
2238 | BGP_NOTIFY_HEADER_ERR, | |
2239 | BGP_NOTIFY_HEADER_BAD_MESTYPE, | |
2240 | &type, 1); | |
2241 | goto done; | |
2242 | } | |
2243 | /* Mimimum packet length check. */ | |
2244 | if ((size < BGP_HEADER_SIZE) | |
2245 | || (size > BGP_MAX_PACKET_SIZE) | |
2246 | || (type == BGP_MSG_OPEN && size < BGP_MSG_OPEN_MIN_SIZE) | |
2247 | || (type == BGP_MSG_UPDATE && size < BGP_MSG_UPDATE_MIN_SIZE) | |
2248 | || (type == BGP_MSG_NOTIFY && size < BGP_MSG_NOTIFY_MIN_SIZE) | |
2249 | || (type == BGP_MSG_KEEPALIVE && size != BGP_MSG_KEEPALIVE_MIN_SIZE) | |
2250 | || (type == BGP_MSG_ROUTE_REFRESH_NEW && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE) | |
2251 | || (type == BGP_MSG_ROUTE_REFRESH_OLD && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE) | |
2252 | || (type == BGP_MSG_CAPABILITY && size < BGP_MSG_CAPABILITY_MIN_SIZE)) | |
2253 | { | |
16286195 DS |
2254 | if (bgp_debug_neighbor_events(peer)) |
2255 | zlog_debug ("%s bad message length - %d for %s", | |
2256 | peer->host, size, | |
2257 | type == 128 ? "ROUTE-REFRESH" : | |
2258 | bgp_type_str[(int) type]); | |
718e3744 | 2259 | bgp_notify_send_with_data (peer, |
2260 | BGP_NOTIFY_HEADER_ERR, | |
2261 | BGP_NOTIFY_HEADER_BAD_MESLEN, | |
c9e52be3 | 2262 | (u_char *) notify_data_length, 2); |
718e3744 | 2263 | goto done; |
2264 | } | |
2265 | ||
2266 | /* Adjust size to message length. */ | |
2267 | peer->packet_size = size; | |
2268 | } | |
2269 | ||
2270 | ret = bgp_read_packet (peer); | |
2271 | if (ret < 0) | |
2272 | goto done; | |
2273 | ||
2274 | /* Get size and type again. */ | |
18f1dc06 | 2275 | (void)stream_getw_from (peer->ibuf, BGP_MARKER_SIZE); |
718e3744 | 2276 | type = stream_getc_from (peer->ibuf, BGP_MARKER_SIZE + 2); |
2277 | ||
2278 | /* BGP packet dump function. */ | |
2279 | bgp_dump_packet (peer, type, peer->ibuf); | |
2280 | ||
2281 | size = (peer->packet_size - BGP_HEADER_SIZE); | |
2282 | ||
2283 | /* Read rest of the packet and call each sort of packet routine */ | |
2284 | switch (type) | |
2285 | { | |
2286 | case BGP_MSG_OPEN: | |
2287 | peer->open_in++; | |
f5ba3874 | 2288 | bgp_open_receive (peer, size); /* XXX return value ignored! */ |
718e3744 | 2289 | break; |
2290 | case BGP_MSG_UPDATE: | |
d61c1bbd | 2291 | peer->readtime = bgp_recent_clock (); |
718e3744 | 2292 | bgp_update_receive (peer, size); |
2293 | break; | |
2294 | case BGP_MSG_NOTIFY: | |
2295 | bgp_notify_receive (peer, size); | |
2296 | break; | |
2297 | case BGP_MSG_KEEPALIVE: | |
d61c1bbd | 2298 | peer->readtime = bgp_recent_clock (); |
718e3744 | 2299 | bgp_keepalive_receive (peer, size); |
2300 | break; | |
2301 | case BGP_MSG_ROUTE_REFRESH_NEW: | |
2302 | case BGP_MSG_ROUTE_REFRESH_OLD: | |
2303 | peer->refresh_in++; | |
2304 | bgp_route_refresh_receive (peer, size); | |
2305 | break; | |
2306 | case BGP_MSG_CAPABILITY: | |
2307 | peer->dynamic_cap_in++; | |
2308 | bgp_capability_receive (peer, size); | |
2309 | break; | |
2310 | } | |
2311 | ||
d6661008 DS |
2312 | /* If reading this packet caused us to send a NOTIFICATION then store a copy |
2313 | * of the packet for troubleshooting purposes | |
2314 | */ | |
2315 | if (notify_out < peer->notify_out) | |
2316 | { | |
2317 | memcpy(peer->last_reset_cause, peer->ibuf->data, peer->packet_size); | |
2318 | peer->last_reset_cause_size = peer->packet_size; | |
2319 | notify_out = peer->notify_out; | |
2320 | } | |
2321 | ||
718e3744 | 2322 | /* Clear input buffer. */ |
2323 | peer->packet_size = 0; | |
2324 | if (peer->ibuf) | |
2325 | stream_reset (peer->ibuf); | |
2326 | ||
2327 | done: | |
d6661008 DS |
2328 | /* If reading this packet caused us to send a NOTIFICATION then store a copy |
2329 | * of the packet for troubleshooting purposes | |
2330 | */ | |
2331 | if (notify_out < peer->notify_out) | |
2332 | { | |
2333 | memcpy(peer->last_reset_cause, peer->ibuf->data, peer->packet_size); | |
2334 | peer->last_reset_cause_size = peer->packet_size; | |
2335 | } | |
2336 | ||
718e3744 | 2337 | return 0; |
2338 | } |