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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 () */ | |
31 | #include "linklist.h" | |
32 | #include "plist.h" | |
33 | ||
34 | #include "bgpd/bgpd.h" | |
35 | #include "bgpd/bgp_table.h" | |
36 | #include "bgpd/bgp_dump.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_debug.h" | |
39 | #include "bgpd/bgp_fsm.h" | |
40 | #include "bgpd/bgp_route.h" | |
41 | #include "bgpd/bgp_packet.h" | |
42 | #include "bgpd/bgp_open.h" | |
43 | #include "bgpd/bgp_aspath.h" | |
44 | #include "bgpd/bgp_community.h" | |
45 | #include "bgpd/bgp_ecommunity.h" | |
46 | #include "bgpd/bgp_network.h" | |
47 | #include "bgpd/bgp_mplsvpn.h" | |
48 | #include "bgpd/bgp_advertise.h" | |
93406d87 | 49 | #include "bgpd/bgp_vty.h" |
718e3744 | 50 | |
51 | int stream_put_prefix (struct stream *, struct prefix *); | |
6b0655a2 | 52 | |
718e3744 | 53 | /* Set up BGP packet marker and packet type. */ |
54 | static int | |
55 | bgp_packet_set_marker (struct stream *s, u_char type) | |
56 | { | |
57 | int i; | |
58 | ||
59 | /* Fill in marker. */ | |
60 | for (i = 0; i < BGP_MARKER_SIZE; i++) | |
61 | stream_putc (s, 0xff); | |
62 | ||
63 | /* Dummy total length. This field is should be filled in later on. */ | |
64 | stream_putw (s, 0); | |
65 | ||
66 | /* BGP packet type. */ | |
67 | stream_putc (s, type); | |
68 | ||
69 | /* Return current stream size. */ | |
9985f83c | 70 | return stream_get_endp (s); |
718e3744 | 71 | } |
72 | ||
73 | /* Set BGP packet header size entry. If size is zero then use current | |
74 | stream size. */ | |
75 | static int | |
76 | bgp_packet_set_size (struct stream *s) | |
77 | { | |
78 | int cp; | |
79 | ||
80 | /* Preserve current pointer. */ | |
9985f83c | 81 | cp = stream_get_endp (s); |
82 | stream_putw_at (s, BGP_MARKER_SIZE, cp); | |
718e3744 | 83 | |
84 | return cp; | |
85 | } | |
86 | ||
87 | /* Add new packet to the peer. */ | |
94f2b392 | 88 | static void |
718e3744 | 89 | bgp_packet_add (struct peer *peer, struct stream *s) |
90 | { | |
91 | /* Add packet to the end of list. */ | |
92 | stream_fifo_push (peer->obuf, s); | |
93 | } | |
94 | ||
95 | /* Free first packet. */ | |
94f2b392 | 96 | static void |
718e3744 | 97 | bgp_packet_delete (struct peer *peer) |
98 | { | |
99 | stream_free (stream_fifo_pop (peer->obuf)); | |
100 | } | |
101 | ||
718e3744 | 102 | /* Check file descriptor whether connect is established. */ |
fc9a856f DS |
103 | int |
104 | bgp_connect_check (struct peer *peer, int change_state) | |
718e3744 | 105 | { |
106 | int status; | |
5228ad27 | 107 | socklen_t slen; |
718e3744 | 108 | int ret; |
109 | ||
110 | /* Anyway I have to reset read and write thread. */ | |
111 | BGP_READ_OFF (peer->t_read); | |
112 | BGP_WRITE_OFF (peer->t_write); | |
113 | ||
114 | /* Check file descriptor. */ | |
115 | slen = sizeof (status); | |
eb821189 | 116 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *) &status, &slen); |
718e3744 | 117 | |
118 | /* If getsockopt is fail, this is fatal error. */ | |
119 | if (ret < 0) | |
120 | { | |
121 | zlog (peer->log, LOG_INFO, "can't get sockopt for nonblocking connect"); | |
122 | BGP_EVENT_ADD (peer, TCP_fatal_error); | |
fc9a856f | 123 | return -1; |
718e3744 | 124 | } |
125 | ||
126 | /* When status is 0 then TCP connection is established. */ | |
127 | if (status == 0) | |
128 | { | |
129 | BGP_EVENT_ADD (peer, TCP_connection_open); | |
fc9a856f | 130 | return 1; |
718e3744 | 131 | } |
132 | else | |
133 | { | |
134 | if (BGP_DEBUG (events, EVENTS)) | |
6b51474d | 135 | plog_debug (peer->log, "%s [Event] Connect failed (%s)", |
6099b3b5 | 136 | peer->host, safe_strerror (errno)); |
fc9a856f DS |
137 | if (change_state) |
138 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
139 | return 0; | |
718e3744 | 140 | } |
141 | } | |
142 | ||
143 | /* Make BGP update packet. */ | |
94f2b392 | 144 | static struct stream * |
718e3744 | 145 | bgp_update_packet (struct peer *peer, afi_t afi, safi_t safi) |
146 | { | |
147 | struct stream *s; | |
8c71e481 | 148 | struct stream *snlri; |
718e3744 | 149 | struct bgp_adj_out *adj; |
150 | struct bgp_advertise *adv; | |
151 | struct stream *packet; | |
152 | struct bgp_node *rn = NULL; | |
153 | struct bgp_info *binfo = NULL; | |
154 | bgp_size_t total_attr_len = 0; | |
8c71e481 | 155 | unsigned long attrlen_pos = 0; |
0a91ff55 DS |
156 | int space_remaining = 0; |
157 | int space_needed = 0; | |
8c71e481 PM |
158 | size_t mpattrlen_pos = 0; |
159 | size_t mpattr_pos = 0; | |
718e3744 | 160 | |
161 | s = peer->work; | |
162 | stream_reset (s); | |
8c71e481 PM |
163 | snlri = peer->scratch; |
164 | stream_reset (snlri); | |
718e3744 | 165 | |
166 | adv = FIFO_HEAD (&peer->sync[afi][safi]->update); | |
167 | ||
168 | while (adv) | |
169 | { | |
ed3ebfa3 PJ |
170 | assert (adv->rn); |
171 | rn = adv->rn; | |
718e3744 | 172 | adj = adv->adj; |
173 | if (adv->binfo) | |
174 | binfo = adv->binfo; | |
718e3744 | 175 | |
0a91ff55 DS |
176 | space_remaining = STREAM_CONCAT_REMAIN (s, snlri, STREAM_SIZE(s)) - |
177 | BGP_MAX_PACKET_SIZE_OVERFLOW; | |
178 | space_needed = BGP_NLRI_LENGTH + PSIZE (rn->p.prefixlen); | |
179 | ||
718e3744 | 180 | /* When remaining space can't include NLRI and it's length. */ |
0a91ff55 | 181 | if (space_remaining < space_needed) |
718e3744 | 182 | break; |
183 | ||
184 | /* If packet is empty, set attribute. */ | |
185 | if (stream_empty (s)) | |
186 | { | |
ed3ebfa3 | 187 | struct peer *from = NULL; |
8c71e481 | 188 | |
d3ddb22e | 189 | if (binfo) |
8c71e481 PM |
190 | from = binfo->peer; |
191 | ||
192 | /* 1: Write the BGP message header - 16 bytes marker, 2 bytes length, | |
193 | * one byte message type. | |
194 | */ | |
718e3744 | 195 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); |
8c71e481 PM |
196 | |
197 | /* 2: withdrawn routes length */ | |
198 | stream_putw (s, 0); | |
199 | ||
200 | /* 3: total attributes length - attrlen_pos stores the position */ | |
201 | attrlen_pos = stream_get_endp (s); | |
718e3744 | 202 | stream_putw (s, 0); |
8c71e481 PM |
203 | |
204 | /* 4: if there is MP_REACH_NLRI attribute, that should be the first | |
205 | * attribute, according to draft-ietf-idr-error-handling. Save the | |
206 | * position. | |
207 | */ | |
208 | mpattr_pos = stream_get_endp(s); | |
209 | ||
210 | /* 5: Encode all the attributes, except MP_REACH_NLRI attr. */ | |
211 | total_attr_len = bgp_packet_attribute (NULL, peer, s, | |
5228ad27 | 212 | adv->baa->attr, |
8c71e481 PM |
213 | NULL, afi, safi, |
214 | from, NULL, NULL); | |
0a91ff55 DS |
215 | |
216 | space_remaining = STREAM_CONCAT_REMAIN (s, snlri, STREAM_SIZE(s)) - | |
217 | BGP_MAX_PACKET_SIZE_OVERFLOW; | |
218 | space_needed = BGP_NLRI_LENGTH + PSIZE (rn->p.prefixlen); | |
219 | ||
220 | /* If the attributes alone do not leave any room for NLRI then | |
221 | * return */ | |
222 | if (space_remaining < space_needed) | |
223 | { | |
224 | zlog_err ("%s cannot send UPDATE, the attributes do not leave " | |
225 | "room for NLRI", peer->host); | |
226 | /* Flush the FIFO update queue */ | |
227 | while (adv) | |
228 | adv = bgp_advertise_clean (peer, adv->adj, afi, safi); | |
229 | return NULL; | |
230 | } | |
718e3744 | 231 | } |
232 | ||
233 | if (afi == AFI_IP && safi == SAFI_UNICAST) | |
234 | stream_put_prefix (s, &rn->p); | |
8c71e481 PM |
235 | else |
236 | { | |
237 | /* Encode the prefix in MP_REACH_NLRI attribute */ | |
238 | struct prefix_rd *prd = NULL; | |
239 | u_char *tag = NULL; | |
240 | ||
241 | if (rn->prn) | |
242 | prd = (struct prefix_rd *) &rn->prn->p; | |
243 | if (binfo && binfo->extra) | |
244 | tag = binfo->extra->tag; | |
245 | ||
246 | if (stream_empty(snlri)) | |
247 | mpattrlen_pos = bgp_packet_mpattr_start(snlri, afi, safi, | |
248 | adv->baa->attr); | |
249 | bgp_packet_mpattr_prefix(snlri, afi, safi, &rn->p, prd, tag); | |
250 | } | |
718e3744 | 251 | if (BGP_DEBUG (update, UPDATE_OUT)) |
14542f3e JBD |
252 | { |
253 | char buf[INET6_BUFSIZ]; | |
254 | ||
255 | zlog (peer->log, LOG_DEBUG, "%s send UPDATE %s/%d", | |
256 | peer->host, | |
257 | inet_ntop (rn->p.family, &(rn->p.u.prefix), buf, INET6_BUFSIZ), | |
258 | rn->p.prefixlen); | |
259 | } | |
718e3744 | 260 | |
261 | /* Synchnorize attribute. */ | |
262 | if (adj->attr) | |
f6f434b2 | 263 | bgp_attr_unintern (&adj->attr); |
718e3744 | 264 | else |
265 | peer->scount[afi][safi]++; | |
266 | ||
267 | adj->attr = bgp_attr_intern (adv->baa->attr); | |
268 | ||
269 | adv = bgp_advertise_clean (peer, adj, afi, safi); | |
718e3744 | 270 | } |
8c71e481 | 271 | |
718e3744 | 272 | if (! stream_empty (s)) |
273 | { | |
8c71e481 PM |
274 | if (!stream_empty(snlri)) |
275 | { | |
276 | bgp_packet_mpattr_end(snlri, mpattrlen_pos); | |
277 | total_attr_len += stream_get_endp(snlri); | |
278 | } | |
279 | ||
280 | /* set the total attribute length correctly */ | |
281 | stream_putw_at (s, attrlen_pos, total_attr_len); | |
282 | ||
283 | if (!stream_empty(snlri)) | |
284 | packet = stream_dupcat(s, snlri, mpattr_pos); | |
285 | else | |
286 | packet = stream_dup (s); | |
287 | bgp_packet_set_size (packet); | |
718e3744 | 288 | bgp_packet_add (peer, packet); |
eb821189 | 289 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 290 | stream_reset (s); |
8c71e481 | 291 | stream_reset (snlri); |
718e3744 | 292 | return packet; |
293 | } | |
294 | return NULL; | |
93406d87 | 295 | } |
296 | ||
94f2b392 | 297 | static struct stream * |
93406d87 | 298 | bgp_update_packet_eor (struct peer *peer, afi_t afi, safi_t safi) |
299 | { | |
300 | struct stream *s; | |
301 | struct stream *packet; | |
302 | ||
750e8146 PJ |
303 | if (DISABLE_BGP_ANNOUNCE) |
304 | return NULL; | |
93406d87 | 305 | |
306 | if (BGP_DEBUG (normal, NORMAL)) | |
307 | zlog_debug ("send End-of-RIB for %s to %s", afi_safi_print (afi, safi), peer->host); | |
308 | ||
309 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
310 | ||
311 | /* Make BGP update packet. */ | |
312 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
313 | ||
314 | /* Unfeasible Routes Length */ | |
315 | stream_putw (s, 0); | |
718e3744 | 316 | |
93406d87 | 317 | if (afi == AFI_IP && safi == SAFI_UNICAST) |
318 | { | |
319 | /* Total Path Attribute Length */ | |
320 | stream_putw (s, 0); | |
321 | } | |
322 | else | |
323 | { | |
324 | /* Total Path Attribute Length */ | |
325 | stream_putw (s, 6); | |
326 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
327 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); | |
328 | stream_putc (s, 3); | |
329 | stream_putw (s, afi); | |
330 | stream_putc (s, safi); | |
331 | } | |
332 | ||
333 | bgp_packet_set_size (s); | |
e83e2080 | 334 | packet = stream_dup (s); |
93406d87 | 335 | bgp_packet_add (peer, packet); |
336 | stream_free (s); | |
337 | return packet; | |
718e3744 | 338 | } |
339 | ||
340 | /* Make BGP withdraw packet. */ | |
8c71e481 PM |
341 | /* For ipv4 unicast: |
342 | 16-octet marker | 2-octet length | 1-octet type | | |
343 | 2-octet withdrawn route length | withdrawn prefixes | 2-octet attrlen (=0) | |
344 | */ | |
345 | /* For other afi/safis: | |
346 | 16-octet marker | 2-octet length | 1-octet type | | |
347 | 2-octet withdrawn route length (=0) | 2-octet attrlen | | |
348 | mp_unreach attr type | attr len | afi | safi | withdrawn prefixes | |
349 | */ | |
94f2b392 | 350 | static struct stream * |
718e3744 | 351 | bgp_withdraw_packet (struct peer *peer, afi_t afi, safi_t safi) |
352 | { | |
353 | struct stream *s; | |
354 | struct stream *packet; | |
355 | struct bgp_adj_out *adj; | |
356 | struct bgp_advertise *adv; | |
357 | struct bgp_node *rn; | |
358 | unsigned long pos; | |
359 | bgp_size_t unfeasible_len; | |
360 | bgp_size_t total_attr_len; | |
8c71e481 PM |
361 | size_t mp_start = 0; |
362 | size_t attrlen_pos = 0; | |
363 | size_t mplen_pos = 0; | |
364 | u_char first_time = 1; | |
0a91ff55 DS |
365 | int space_remaining = 0; |
366 | int space_needed = 0; | |
718e3744 | 367 | |
368 | s = peer->work; | |
369 | stream_reset (s); | |
370 | ||
371 | while ((adv = FIFO_HEAD (&peer->sync[afi][safi]->withdraw)) != NULL) | |
372 | { | |
ed3ebfa3 | 373 | assert (adv->rn); |
718e3744 | 374 | adj = adv->adj; |
375 | rn = adv->rn; | |
718e3744 | 376 | |
0a91ff55 DS |
377 | space_remaining = STREAM_REMAIN (s) - |
378 | BGP_MAX_PACKET_SIZE_OVERFLOW; | |
379 | space_needed = (BGP_NLRI_LENGTH + BGP_TOTAL_ATTR_LEN + | |
380 | PSIZE (rn->p.prefixlen)); | |
381 | ||
382 | if (space_remaining < space_needed) | |
718e3744 | 383 | break; |
384 | ||
385 | if (stream_empty (s)) | |
386 | { | |
387 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
8c71e481 | 388 | stream_putw (s, 0); /* unfeasible routes length */ |
718e3744 | 389 | } |
8c71e481 PM |
390 | else |
391 | first_time = 0; | |
718e3744 | 392 | |
393 | if (afi == AFI_IP && safi == SAFI_UNICAST) | |
394 | stream_put_prefix (s, &rn->p); | |
395 | else | |
396 | { | |
a3b6ea56 | 397 | struct prefix_rd *prd = NULL; |
8c71e481 | 398 | |
a3b6ea56 PJ |
399 | if (rn->prn) |
400 | prd = (struct prefix_rd *) &rn->prn->p; | |
8c71e481 PM |
401 | |
402 | /* If first time, format the MP_UNREACH header */ | |
403 | if (first_time) | |
404 | { | |
405 | attrlen_pos = stream_get_endp (s); | |
406 | /* total attr length = 0 for now. reevaluate later */ | |
407 | stream_putw (s, 0); | |
408 | mp_start = stream_get_endp (s); | |
409 | mplen_pos = bgp_packet_mpunreach_start(s, afi, safi); | |
410 | } | |
411 | ||
412 | bgp_packet_mpunreach_prefix(s, &rn->p, afi, safi, prd, NULL); | |
718e3744 | 413 | } |
414 | ||
415 | if (BGP_DEBUG (update, UPDATE_OUT)) | |
14542f3e JBD |
416 | { |
417 | char buf[INET6_BUFSIZ]; | |
418 | ||
419 | zlog (peer->log, LOG_DEBUG, "%s send UPDATE %s/%d -- unreachable", | |
420 | peer->host, | |
421 | inet_ntop (rn->p.family, &(rn->p.u.prefix), buf, INET6_BUFSIZ), | |
422 | rn->p.prefixlen); | |
423 | } | |
718e3744 | 424 | |
425 | peer->scount[afi][safi]--; | |
426 | ||
427 | bgp_adj_out_remove (rn, adj, peer, afi, safi); | |
428 | bgp_unlock_node (rn); | |
718e3744 | 429 | } |
430 | ||
431 | if (! stream_empty (s)) | |
432 | { | |
433 | if (afi == AFI_IP && safi == SAFI_UNICAST) | |
434 | { | |
8c71e481 | 435 | unfeasible_len |
9985f83c | 436 | = stream_get_endp (s) - BGP_HEADER_SIZE - BGP_UNFEASIBLE_LEN; |
718e3744 | 437 | stream_putw_at (s, BGP_HEADER_SIZE, unfeasible_len); |
438 | stream_putw (s, 0); | |
439 | } | |
8c71e481 PM |
440 | else |
441 | { | |
442 | /* Set the mp_unreach attr's length */ | |
443 | bgp_packet_mpunreach_end(s, mplen_pos); | |
444 | ||
445 | /* Set total path attribute length. */ | |
446 | total_attr_len = stream_get_endp(s) - mp_start; | |
447 | stream_putw_at (s, attrlen_pos, total_attr_len); | |
448 | } | |
718e3744 | 449 | bgp_packet_set_size (s); |
e83e2080 | 450 | packet = stream_dup (s); |
718e3744 | 451 | bgp_packet_add (peer, packet); |
452 | stream_reset (s); | |
453 | return packet; | |
454 | } | |
455 | ||
456 | return NULL; | |
457 | } | |
458 | ||
459 | void | |
460 | bgp_default_update_send (struct peer *peer, struct attr *attr, | |
461 | afi_t afi, safi_t safi, struct peer *from) | |
462 | { | |
463 | struct stream *s; | |
464 | struct stream *packet; | |
465 | struct prefix p; | |
466 | unsigned long pos; | |
467 | bgp_size_t total_attr_len; | |
718e3744 | 468 | |
750e8146 PJ |
469 | if (DISABLE_BGP_ANNOUNCE) |
470 | return; | |
718e3744 | 471 | |
472 | if (afi == AFI_IP) | |
473 | str2prefix ("0.0.0.0/0", &p); | |
474 | #ifdef HAVE_IPV6 | |
475 | else | |
476 | str2prefix ("::/0", &p); | |
477 | #endif /* HAVE_IPV6 */ | |
478 | ||
479 | /* Logging the attribute. */ | |
480 | if (BGP_DEBUG (update, UPDATE_OUT)) | |
481 | { | |
14542f3e JBD |
482 | char attrstr[BUFSIZ]; |
483 | char buf[INET6_BUFSIZ]; | |
484 | attrstr[0] = '\0'; | |
485 | ||
718e3744 | 486 | bgp_dump_attr (peer, attr, attrstr, BUFSIZ); |
6b51474d | 487 | zlog (peer->log, LOG_DEBUG, "%s send UPDATE %s/%d %s", |
14542f3e | 488 | peer->host, inet_ntop(p.family, &(p.u.prefix), buf, INET6_BUFSIZ), |
718e3744 | 489 | p.prefixlen, attrstr); |
490 | } | |
491 | ||
492 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
493 | ||
494 | /* Make BGP update packet. */ | |
495 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
496 | ||
497 | /* Unfeasible Routes Length. */ | |
498 | stream_putw (s, 0); | |
499 | ||
500 | /* Make place for total attribute length. */ | |
9985f83c | 501 | pos = stream_get_endp (s); |
718e3744 | 502 | stream_putw (s, 0); |
503 | total_attr_len = bgp_packet_attribute (NULL, peer, s, attr, &p, afi, safi, from, NULL, NULL); | |
504 | ||
505 | /* Set Total Path Attribute Length. */ | |
506 | stream_putw_at (s, pos, total_attr_len); | |
507 | ||
508 | /* NLRI set. */ | |
509 | if (p.family == AF_INET && safi == SAFI_UNICAST) | |
510 | stream_put_prefix (s, &p); | |
511 | ||
512 | /* Set size. */ | |
513 | bgp_packet_set_size (s); | |
514 | ||
e83e2080 | 515 | packet = stream_dup (s); |
718e3744 | 516 | stream_free (s); |
517 | ||
518 | /* Dump packet if debug option is set. */ | |
519 | #ifdef DEBUG | |
2d74db55 | 520 | /* bgp_packet_dump (packet); */ |
718e3744 | 521 | #endif /* DEBUG */ |
522 | ||
523 | /* Add packet to the peer. */ | |
524 | bgp_packet_add (peer, packet); | |
525 | ||
eb821189 | 526 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 527 | } |
528 | ||
529 | void | |
530 | bgp_default_withdraw_send (struct peer *peer, afi_t afi, safi_t safi) | |
531 | { | |
532 | struct stream *s; | |
533 | struct stream *packet; | |
534 | struct prefix p; | |
8c71e481 | 535 | unsigned long attrlen_pos = 0; |
718e3744 | 536 | unsigned long cp; |
537 | bgp_size_t unfeasible_len; | |
538 | bgp_size_t total_attr_len; | |
8c71e481 PM |
539 | size_t mp_start = 0; |
540 | size_t mplen_pos = 0; | |
718e3744 | 541 | |
750e8146 PJ |
542 | if (DISABLE_BGP_ANNOUNCE) |
543 | return; | |
718e3744 | 544 | |
545 | if (afi == AFI_IP) | |
546 | str2prefix ("0.0.0.0/0", &p); | |
547 | #ifdef HAVE_IPV6 | |
548 | else | |
549 | str2prefix ("::/0", &p); | |
550 | #endif /* HAVE_IPV6 */ | |
551 | ||
552 | total_attr_len = 0; | |
718e3744 | 553 | |
554 | if (BGP_DEBUG (update, UPDATE_OUT)) | |
14542f3e JBD |
555 | { |
556 | char buf[INET6_BUFSIZ]; | |
557 | ||
558 | zlog (peer->log, LOG_DEBUG, "%s send UPDATE %s/%d -- unreachable", | |
559 | peer->host, inet_ntop(p.family, &(p.u.prefix), buf, INET6_BUFSIZ), | |
560 | p.prefixlen); | |
561 | } | |
718e3744 | 562 | |
563 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
564 | ||
565 | /* Make BGP update packet. */ | |
566 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
567 | ||
568 | /* Unfeasible Routes Length. */; | |
9985f83c | 569 | cp = stream_get_endp (s); |
718e3744 | 570 | stream_putw (s, 0); |
571 | ||
572 | /* Withdrawn Routes. */ | |
573 | if (p.family == AF_INET && safi == SAFI_UNICAST) | |
574 | { | |
575 | stream_put_prefix (s, &p); | |
576 | ||
9985f83c | 577 | unfeasible_len = stream_get_endp (s) - cp - 2; |
718e3744 | 578 | |
579 | /* Set unfeasible len. */ | |
580 | stream_putw_at (s, cp, unfeasible_len); | |
581 | ||
582 | /* Set total path attribute length. */ | |
583 | stream_putw (s, 0); | |
584 | } | |
585 | else | |
586 | { | |
8c71e481 | 587 | attrlen_pos = stream_get_endp (s); |
718e3744 | 588 | stream_putw (s, 0); |
8c71e481 PM |
589 | mp_start = stream_get_endp (s); |
590 | mplen_pos = bgp_packet_mpunreach_start(s, afi, safi); | |
591 | bgp_packet_mpunreach_prefix(s, &p, afi, safi, NULL, NULL); | |
592 | ||
593 | /* Set the mp_unreach attr's length */ | |
594 | bgp_packet_mpunreach_end(s, mplen_pos); | |
718e3744 | 595 | |
596 | /* Set total path attribute length. */ | |
8c71e481 PM |
597 | total_attr_len = stream_get_endp(s) - mp_start; |
598 | stream_putw_at (s, attrlen_pos, total_attr_len); | |
718e3744 | 599 | } |
600 | ||
601 | bgp_packet_set_size (s); | |
602 | ||
e83e2080 | 603 | packet = stream_dup (s); |
718e3744 | 604 | stream_free (s); |
605 | ||
606 | /* Add packet to the peer. */ | |
607 | bgp_packet_add (peer, packet); | |
608 | ||
eb821189 | 609 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 610 | } |
611 | ||
612 | /* Get next packet to be written. */ | |
94f2b392 | 613 | static struct stream * |
718e3744 | 614 | bgp_write_packet (struct peer *peer) |
615 | { | |
616 | afi_t afi; | |
617 | safi_t safi; | |
618 | struct stream *s = NULL; | |
619 | struct bgp_advertise *adv; | |
620 | ||
621 | s = stream_fifo_head (peer->obuf); | |
622 | if (s) | |
623 | return s; | |
624 | ||
4a16ae86 DS |
625 | /* The code beyond this part deals with update packets, check if updates |
626 | are on hold as part of the update-delay post processing stages. */ | |
627 | if (peer->bgp && (peer->bgp->main_peers_update_hold || | |
628 | peer->bgp->rsclient_peers_update_hold)) | |
629 | return NULL; | |
630 | ||
718e3744 | 631 | for (afi = AFI_IP; afi < AFI_MAX; afi++) |
632 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
633 | { | |
634 | adv = FIFO_HEAD (&peer->sync[afi][safi]->withdraw); | |
635 | if (adv) | |
636 | { | |
637 | s = bgp_withdraw_packet (peer, afi, safi); | |
638 | if (s) | |
639 | return s; | |
640 | } | |
641 | } | |
642 | ||
643 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
644 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
645 | { | |
646 | adv = FIFO_HEAD (&peer->sync[afi][safi]->update); | |
647 | if (adv) | |
648 | { | |
cb1faec9 | 649 | if (adv->binfo && adv->binfo->uptime <= peer->synctime) |
93406d87 | 650 | { |
651 | if (CHECK_FLAG (adv->binfo->peer->cap, PEER_CAP_RESTART_RCV) | |
652 | && CHECK_FLAG (adv->binfo->peer->cap, PEER_CAP_RESTART_ADV) | |
fe7d2a48 DS |
653 | && ! (CHECK_FLAG (adv->binfo->peer->cap, |
654 | PEER_CAP_RESTART_BIT_RCV) && | |
655 | CHECK_FLAG (adv->binfo->peer->cap, | |
656 | PEER_CAP_RESTART_BIT_ADV)) | |
93406d87 | 657 | && ! CHECK_FLAG (adv->binfo->flags, BGP_INFO_STALE) |
658 | && safi != SAFI_MPLS_VPN) | |
659 | { | |
660 | if (CHECK_FLAG (adv->binfo->peer->af_sflags[afi][safi], | |
661 | PEER_STATUS_EOR_RECEIVED)) | |
662 | s = bgp_update_packet (peer, afi, safi); | |
663 | } | |
664 | else | |
665 | s = bgp_update_packet (peer, afi, safi); | |
666 | } | |
718e3744 | 667 | |
668 | if (s) | |
669 | return s; | |
670 | } | |
93406d87 | 671 | |
672 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV)) | |
673 | { | |
674 | if (peer->afc_nego[afi][safi] && peer->synctime | |
675 | && ! CHECK_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_EOR_SEND) | |
676 | && safi != SAFI_MPLS_VPN) | |
677 | { | |
678 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_EOR_SEND); | |
679 | return bgp_update_packet_eor (peer, afi, safi); | |
680 | } | |
681 | } | |
718e3744 | 682 | } |
683 | ||
684 | return NULL; | |
685 | } | |
686 | ||
687 | /* Is there partially written packet or updates we can send right | |
688 | now. */ | |
94f2b392 | 689 | static int |
718e3744 | 690 | bgp_write_proceed (struct peer *peer) |
691 | { | |
692 | afi_t afi; | |
693 | safi_t safi; | |
694 | struct bgp_advertise *adv; | |
695 | ||
696 | if (stream_fifo_head (peer->obuf)) | |
697 | return 1; | |
698 | ||
699 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
700 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
701 | if (FIFO_HEAD (&peer->sync[afi][safi]->withdraw)) | |
702 | return 1; | |
703 | ||
704 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
705 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
706 | if ((adv = FIFO_HEAD (&peer->sync[afi][safi]->update)) != NULL) | |
707 | if (adv->binfo->uptime < peer->synctime) | |
708 | return 1; | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | /* Write packet to the peer. */ | |
714 | int | |
715 | bgp_write (struct thread *thread) | |
716 | { | |
717 | struct peer *peer; | |
718 | u_char type; | |
719 | struct stream *s; | |
720 | int num; | |
fd79ac91 | 721 | unsigned int count = 0; |
cb1faec9 | 722 | int oc = 0; |
718e3744 | 723 | |
724 | /* Yes first of all get peer pointer. */ | |
725 | peer = THREAD_ARG (thread); | |
726 | peer->t_write = NULL; | |
727 | ||
728 | /* For non-blocking IO check. */ | |
729 | if (peer->status == Connect) | |
730 | { | |
fc9a856f | 731 | bgp_connect_check (peer, 1); |
718e3744 | 732 | return 0; |
733 | } | |
734 | ||
eac5702d SH |
735 | s = bgp_write_packet (peer); |
736 | if (!s) | |
737 | return 0; /* nothing to send */ | |
738 | ||
739 | sockopt_cork (peer->fd, 1); | |
740 | ||
cb1faec9 DS |
741 | oc = peer->update_out; |
742 | ||
eac5702d SH |
743 | /* Nonblocking write until TCP output buffer is full. */ |
744 | do | |
718e3744 | 745 | { |
746 | int writenum; | |
718e3744 | 747 | |
748 | /* Number of bytes to be sent. */ | |
749 | writenum = stream_get_endp (s) - stream_get_getp (s); | |
750 | ||
751 | /* Call write() system call. */ | |
eb821189 | 752 | num = write (peer->fd, STREAM_PNT (s), writenum); |
35398589 | 753 | if (num < 0) |
718e3744 | 754 | { |
eac5702d SH |
755 | /* write failed either retry needed or error */ |
756 | if (ERRNO_IO_RETRY(errno)) | |
757 | break; | |
758 | ||
759 | BGP_EVENT_ADD (peer, TCP_fatal_error); | |
718e3744 | 760 | return 0; |
761 | } | |
35398589 | 762 | |
718e3744 | 763 | if (num != writenum) |
764 | { | |
35398589 | 765 | /* Partial write */ |
9985f83c | 766 | stream_forward_getp (s, num); |
eac5702d | 767 | break; |
718e3744 | 768 | } |
769 | ||
770 | /* Retrieve BGP packet type. */ | |
771 | stream_set_getp (s, BGP_MARKER_SIZE + 2); | |
772 | type = stream_getc (s); | |
773 | ||
774 | switch (type) | |
775 | { | |
776 | case BGP_MSG_OPEN: | |
777 | peer->open_out++; | |
778 | break; | |
779 | case BGP_MSG_UPDATE: | |
780 | peer->update_out++; | |
781 | break; | |
782 | case BGP_MSG_NOTIFY: | |
783 | peer->notify_out++; | |
784 | /* Double start timer. */ | |
785 | peer->v_start *= 2; | |
786 | ||
787 | /* Overflow check. */ | |
788 | if (peer->v_start >= (60 * 2)) | |
789 | peer->v_start = (60 * 2); | |
790 | ||
ca058a30 | 791 | /* Flush any existing events */ |
dcdf399f | 792 | BGP_EVENT_ADD (peer, BGP_Stop); |
3a69f74a SH |
793 | goto done; |
794 | ||
718e3744 | 795 | case BGP_MSG_KEEPALIVE: |
796 | peer->keepalive_out++; | |
797 | break; | |
798 | case BGP_MSG_ROUTE_REFRESH_NEW: | |
799 | case BGP_MSG_ROUTE_REFRESH_OLD: | |
800 | peer->refresh_out++; | |
801 | break; | |
802 | case BGP_MSG_CAPABILITY: | |
803 | peer->dynamic_cap_out++; | |
804 | break; | |
805 | } | |
806 | ||
807 | /* OK we send packet so delete it. */ | |
808 | bgp_packet_delete (peer); | |
718e3744 | 809 | } |
cb1faec9 | 810 | while (++count < peer->bgp->wpkt_quanta && |
eac5702d | 811 | (s = bgp_write_packet (peer)) != NULL); |
cb1faec9 | 812 | |
718e3744 | 813 | if (bgp_write_proceed (peer)) |
eb821189 | 814 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
3a69f74a SH |
815 | |
816 | done: | |
cb1faec9 DS |
817 | /* Update the last write if some updates were written. */ |
818 | if (peer->update_out > oc) | |
819 | peer->last_write = bgp_clock (); | |
820 | ||
3a69f74a | 821 | sockopt_cork (peer->fd, 0); |
718e3744 | 822 | return 0; |
823 | } | |
824 | ||
825 | /* This is only for sending NOTIFICATION message to neighbor. */ | |
94f2b392 | 826 | static int |
718e3744 | 827 | bgp_write_notify (struct peer *peer) |
828 | { | |
35398589 | 829 | int ret, val; |
718e3744 | 830 | u_char type; |
831 | struct stream *s; | |
832 | ||
833 | /* There should be at least one packet. */ | |
834 | s = stream_fifo_head (peer->obuf); | |
835 | if (!s) | |
836 | return 0; | |
837 | assert (stream_get_endp (s) >= BGP_HEADER_SIZE); | |
838 | ||
86998bc2 LR |
839 | /* Stop collecting data within the socket */ |
840 | sockopt_cork (peer->fd, 0); | |
841 | ||
8ff202e2 DL |
842 | /* socket is in nonblocking mode, if we can't deliver the NOTIFY, well, |
843 | * we only care about getting a clean shutdown at this point. */ | |
86998bc2 | 844 | ret = write (peer->fd, STREAM_DATA (s), stream_get_endp (s)); |
8ff202e2 DL |
845 | |
846 | /* only connection reset/close gets counted as TCP_fatal_error, failure | |
847 | * to write the entire NOTIFY doesn't get different FSM treatment */ | |
718e3744 | 848 | if (ret <= 0) |
849 | { | |
dcdf399f | 850 | BGP_EVENT_ADD (peer, TCP_fatal_error); |
718e3744 | 851 | return 0; |
852 | } | |
853 | ||
86998bc2 LR |
854 | /* Disable Nagle, make NOTIFY packet go out right away */ |
855 | val = 1; | |
856 | (void) setsockopt (peer->fd, IPPROTO_TCP, TCP_NODELAY, | |
857 | (char *) &val, sizeof (val)); | |
858 | ||
718e3744 | 859 | /* Retrieve BGP packet type. */ |
860 | stream_set_getp (s, BGP_MARKER_SIZE + 2); | |
861 | type = stream_getc (s); | |
862 | ||
863 | assert (type == BGP_MSG_NOTIFY); | |
864 | ||
865 | /* Type should be notify. */ | |
866 | peer->notify_out++; | |
867 | ||
868 | /* Double start timer. */ | |
869 | peer->v_start *= 2; | |
870 | ||
871 | /* Overflow check. */ | |
872 | if (peer->v_start >= (60 * 2)) | |
873 | peer->v_start = (60 * 2); | |
874 | ||
1ff9a340 DS |
875 | /* Handle Graceful Restart case where the state changes to |
876 | Connect instead of Idle */ | |
dcdf399f | 877 | BGP_EVENT_ADD (peer, BGP_Stop); |
718e3744 | 878 | |
879 | return 0; | |
880 | } | |
881 | ||
882 | /* Make keepalive packet and send it to the peer. */ | |
883 | void | |
884 | bgp_keepalive_send (struct peer *peer) | |
885 | { | |
886 | struct stream *s; | |
887 | int length; | |
888 | ||
889 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
890 | ||
891 | /* Make keepalive packet. */ | |
892 | bgp_packet_set_marker (s, BGP_MSG_KEEPALIVE); | |
893 | ||
894 | /* Set packet size. */ | |
895 | length = bgp_packet_set_size (s); | |
896 | ||
897 | /* Dump packet if debug option is set. */ | |
898 | /* bgp_packet_dump (s); */ | |
899 | ||
900 | if (BGP_DEBUG (keepalive, KEEPALIVE)) | |
6b51474d | 901 | zlog_debug ("%s sending KEEPALIVE", peer->host); |
718e3744 | 902 | if (BGP_DEBUG (normal, NORMAL)) |
6b51474d | 903 | zlog_debug ("%s send message type %d, length (incl. header) %d", |
718e3744 | 904 | peer->host, BGP_MSG_KEEPALIVE, length); |
905 | ||
906 | /* Add packet to the peer. */ | |
907 | bgp_packet_add (peer, s); | |
908 | ||
eb821189 | 909 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 910 | } |
911 | ||
912 | /* Make open packet and send it to the peer. */ | |
913 | void | |
914 | bgp_open_send (struct peer *peer) | |
915 | { | |
916 | struct stream *s; | |
917 | int length; | |
918 | u_int16_t send_holdtime; | |
919 | as_t local_as; | |
920 | ||
921 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
922 | send_holdtime = peer->holdtime; | |
923 | else | |
924 | send_holdtime = peer->bgp->default_holdtime; | |
925 | ||
926 | /* local-as Change */ | |
927 | if (peer->change_local_as) | |
928 | local_as = peer->change_local_as; | |
929 | else | |
930 | local_as = peer->local_as; | |
931 | ||
932 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
933 | ||
934 | /* Make open packet. */ | |
935 | bgp_packet_set_marker (s, BGP_MSG_OPEN); | |
936 | ||
937 | /* Set open packet values. */ | |
938 | stream_putc (s, BGP_VERSION_4); /* BGP version */ | |
0b2aa3a0 PJ |
939 | stream_putw (s, (local_as <= BGP_AS_MAX) ? (u_int16_t) local_as |
940 | : BGP_AS_TRANS); | |
718e3744 | 941 | stream_putw (s, send_holdtime); /* Hold Time */ |
942 | stream_put_in_addr (s, &peer->local_id); /* BGP Identifier */ | |
943 | ||
944 | /* Set capability code. */ | |
945 | bgp_open_capability (s, peer); | |
946 | ||
947 | /* Set BGP packet length. */ | |
948 | length = bgp_packet_set_size (s); | |
949 | ||
950 | if (BGP_DEBUG (normal, NORMAL)) | |
aea339f7 | 951 | zlog_debug ("%s sending OPEN, version %d, my as %u, holdtime %d, id %s", |
718e3744 | 952 | peer->host, BGP_VERSION_4, local_as, |
953 | send_holdtime, inet_ntoa (peer->local_id)); | |
954 | ||
955 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 956 | zlog_debug ("%s send message type %d, length (incl. header) %d", |
718e3744 | 957 | peer->host, BGP_MSG_OPEN, length); |
958 | ||
959 | /* Dump packet if debug option is set. */ | |
960 | /* bgp_packet_dump (s); */ | |
961 | ||
962 | /* Add packet to the peer. */ | |
963 | bgp_packet_add (peer, s); | |
964 | ||
eb821189 | 965 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 966 | } |
967 | ||
968 | /* Send BGP notify packet with data potion. */ | |
969 | void | |
970 | bgp_notify_send_with_data (struct peer *peer, u_char code, u_char sub_code, | |
971 | u_char *data, size_t datalen) | |
972 | { | |
973 | struct stream *s; | |
974 | int length; | |
975 | ||
976 | /* Allocate new stream. */ | |
977 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
978 | ||
979 | /* Make nitify packet. */ | |
980 | bgp_packet_set_marker (s, BGP_MSG_NOTIFY); | |
981 | ||
982 | /* Set notify packet values. */ | |
983 | stream_putc (s, code); /* BGP notify code */ | |
984 | stream_putc (s, sub_code); /* BGP notify sub_code */ | |
985 | ||
986 | /* If notify data is present. */ | |
987 | if (data) | |
988 | stream_write (s, data, datalen); | |
989 | ||
990 | /* Set BGP packet length. */ | |
991 | length = bgp_packet_set_size (s); | |
992 | ||
993 | /* Add packet to the peer. */ | |
994 | stream_fifo_clean (peer->obuf); | |
995 | bgp_packet_add (peer, s); | |
996 | ||
997 | /* For debug */ | |
998 | { | |
999 | struct bgp_notify bgp_notify; | |
1000 | int first = 0; | |
1001 | int i; | |
1002 | char c[4]; | |
1003 | ||
1004 | bgp_notify.code = code; | |
1005 | bgp_notify.subcode = sub_code; | |
1006 | bgp_notify.data = NULL; | |
1007 | bgp_notify.length = length - BGP_MSG_NOTIFY_MIN_SIZE; | |
1008 | ||
1009 | if (bgp_notify.length) | |
1010 | { | |
1011 | bgp_notify.data = XMALLOC (MTYPE_TMP, bgp_notify.length * 3); | |
1012 | for (i = 0; i < bgp_notify.length; i++) | |
1013 | if (first) | |
1014 | { | |
1015 | sprintf (c, " %02x", data[i]); | |
1016 | strcat (bgp_notify.data, c); | |
1017 | } | |
1018 | else | |
1019 | { | |
1020 | first = 1; | |
1021 | sprintf (c, "%02x", data[i]); | |
1022 | strcpy (bgp_notify.data, c); | |
1023 | } | |
1024 | } | |
1025 | bgp_notify_print (peer, &bgp_notify, "sending"); | |
1026 | if (bgp_notify.data) | |
1027 | XFREE (MTYPE_TMP, bgp_notify.data); | |
1028 | } | |
1029 | ||
1030 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1031 | zlog_debug ("%s send message type %d, length (incl. header) %d", |
718e3744 | 1032 | peer->host, BGP_MSG_NOTIFY, length); |
1033 | ||
e0701b79 | 1034 | /* peer reset cause */ |
1035 | if (sub_code != BGP_NOTIFY_CEASE_CONFIG_CHANGE) | |
1036 | { | |
1037 | if (sub_code == BGP_NOTIFY_CEASE_ADMIN_RESET) | |
1212dc19 | 1038 | { |
1039 | peer->last_reset = PEER_DOWN_USER_RESET; | |
1040 | zlog_info ("Notification sent to neighbor %s: User reset", peer->host); | |
1041 | } | |
e0701b79 | 1042 | else if (sub_code == BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN) |
1212dc19 | 1043 | { |
1044 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; | |
1045 | zlog_info ("Notification sent to neighbor %s: shutdown", peer->host); | |
1046 | } | |
e0701b79 | 1047 | else |
1212dc19 | 1048 | { |
1049 | peer->last_reset = PEER_DOWN_NOTIFY_SEND; | |
1050 | zlog_info ("Notification sent to neighbor %s: type %u/%u", | |
1051 | peer->host, code, sub_code); | |
1052 | } | |
e0701b79 | 1053 | } |
1212dc19 | 1054 | else |
1ff9a340 DS |
1055 | zlog_info ("Notification sent to neighbor %s:%d: configuration change", |
1056 | peer->host, peer->fd); | |
e0701b79 | 1057 | |
7ccf5e59 | 1058 | /* Call immediately. */ |
718e3744 | 1059 | BGP_WRITE_OFF (peer->t_write); |
1060 | ||
1061 | bgp_write_notify (peer); | |
1062 | } | |
1063 | ||
1064 | /* Send BGP notify packet. */ | |
1065 | void | |
1066 | bgp_notify_send (struct peer *peer, u_char code, u_char sub_code) | |
1067 | { | |
1068 | bgp_notify_send_with_data (peer, code, sub_code, NULL, 0); | |
1069 | } | |
1070 | ||
718e3744 | 1071 | /* Send route refresh message to the peer. */ |
1072 | void | |
1073 | bgp_route_refresh_send (struct peer *peer, afi_t afi, safi_t safi, | |
1074 | u_char orf_type, u_char when_to_refresh, int remove) | |
1075 | { | |
1076 | struct stream *s; | |
1077 | struct stream *packet; | |
1078 | int length; | |
1079 | struct bgp_filter *filter; | |
1080 | int orf_refresh = 0; | |
1081 | ||
750e8146 PJ |
1082 | if (DISABLE_BGP_ANNOUNCE) |
1083 | return; | |
718e3744 | 1084 | |
1085 | filter = &peer->filter[afi][safi]; | |
1086 | ||
1087 | /* Adjust safi code. */ | |
1088 | if (safi == SAFI_MPLS_VPN) | |
42e6d745 | 1089 | safi = SAFI_MPLS_LABELED_VPN; |
718e3744 | 1090 | |
1091 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
1092 | ||
1093 | /* Make BGP update packet. */ | |
1094 | if (CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_NEW_RCV)) | |
1095 | bgp_packet_set_marker (s, BGP_MSG_ROUTE_REFRESH_NEW); | |
1096 | else | |
1097 | bgp_packet_set_marker (s, BGP_MSG_ROUTE_REFRESH_OLD); | |
1098 | ||
1099 | /* Encode Route Refresh message. */ | |
1100 | stream_putw (s, afi); | |
1101 | stream_putc (s, 0); | |
1102 | stream_putc (s, safi); | |
1103 | ||
1104 | if (orf_type == ORF_TYPE_PREFIX | |
1105 | || orf_type == ORF_TYPE_PREFIX_OLD) | |
1106 | if (remove || filter->plist[FILTER_IN].plist) | |
1107 | { | |
1108 | u_int16_t orf_len; | |
1109 | unsigned long orfp; | |
1110 | ||
1111 | orf_refresh = 1; | |
1112 | stream_putc (s, when_to_refresh); | |
1113 | stream_putc (s, orf_type); | |
9985f83c | 1114 | orfp = stream_get_endp (s); |
718e3744 | 1115 | stream_putw (s, 0); |
1116 | ||
1117 | if (remove) | |
1118 | { | |
1119 | UNSET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_PREFIX_SEND); | |
1120 | stream_putc (s, ORF_COMMON_PART_REMOVE_ALL); | |
1121 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1122 | zlog_debug ("%s sending REFRESH_REQ to remove ORF(%d) (%s) for afi/safi: %d/%d", |
718e3744 | 1123 | peer->host, orf_type, |
1124 | (when_to_refresh == REFRESH_DEFER ? "defer" : "immediate"), | |
1125 | afi, safi); | |
1126 | } | |
1127 | else | |
1128 | { | |
1129 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_PREFIX_SEND); | |
1130 | prefix_bgp_orf_entry (s, filter->plist[FILTER_IN].plist, | |
1131 | ORF_COMMON_PART_ADD, ORF_COMMON_PART_PERMIT, | |
1132 | ORF_COMMON_PART_DENY); | |
1133 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1134 | zlog_debug ("%s sending REFRESH_REQ with pfxlist ORF(%d) (%s) for afi/safi: %d/%d", |
718e3744 | 1135 | peer->host, orf_type, |
1136 | (when_to_refresh == REFRESH_DEFER ? "defer" : "immediate"), | |
1137 | afi, safi); | |
1138 | } | |
1139 | ||
1140 | /* Total ORF Entry Len. */ | |
9985f83c | 1141 | orf_len = stream_get_endp (s) - orfp - 2; |
718e3744 | 1142 | stream_putw_at (s, orfp, orf_len); |
1143 | } | |
1144 | ||
1145 | /* Set packet size. */ | |
1146 | length = bgp_packet_set_size (s); | |
1147 | ||
1148 | if (BGP_DEBUG (normal, NORMAL)) | |
1149 | { | |
1150 | if (! orf_refresh) | |
6b51474d | 1151 | zlog_debug ("%s sending REFRESH_REQ for afi/safi: %d/%d", |
718e3744 | 1152 | peer->host, afi, safi); |
6b51474d | 1153 | zlog_debug ("%s send message type %d, length (incl. header) %d", |
718e3744 | 1154 | peer->host, CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_NEW_RCV) ? |
1155 | BGP_MSG_ROUTE_REFRESH_NEW : BGP_MSG_ROUTE_REFRESH_OLD, length); | |
1156 | } | |
1157 | ||
1158 | /* Make real packet. */ | |
e83e2080 | 1159 | packet = stream_dup (s); |
718e3744 | 1160 | stream_free (s); |
1161 | ||
1162 | /* Add packet to the peer. */ | |
1163 | bgp_packet_add (peer, packet); | |
1164 | ||
eb821189 | 1165 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 1166 | } |
1167 | ||
1168 | /* Send capability message to the peer. */ | |
1169 | void | |
1170 | bgp_capability_send (struct peer *peer, afi_t afi, safi_t safi, | |
1171 | int capability_code, int action) | |
1172 | { | |
1173 | struct stream *s; | |
1174 | struct stream *packet; | |
1175 | int length; | |
1176 | ||
1177 | /* Adjust safi code. */ | |
1178 | if (safi == SAFI_MPLS_VPN) | |
42e6d745 | 1179 | safi = SAFI_MPLS_LABELED_VPN; |
718e3744 | 1180 | |
1181 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
1182 | ||
1183 | /* Make BGP update packet. */ | |
1184 | bgp_packet_set_marker (s, BGP_MSG_CAPABILITY); | |
1185 | ||
1186 | /* Encode MP_EXT capability. */ | |
1187 | if (capability_code == CAPABILITY_CODE_MP) | |
1188 | { | |
1189 | stream_putc (s, action); | |
1190 | stream_putc (s, CAPABILITY_CODE_MP); | |
1191 | stream_putc (s, CAPABILITY_CODE_MP_LEN); | |
1192 | stream_putw (s, afi); | |
1193 | stream_putc (s, 0); | |
1194 | stream_putc (s, safi); | |
1195 | ||
1196 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1197 | zlog_debug ("%s sending CAPABILITY has %s MP_EXT CAP for afi/safi: %d/%d", |
718e3744 | 1198 | peer->host, action == CAPABILITY_ACTION_SET ? |
1199 | "Advertising" : "Removing", afi, safi); | |
1200 | } | |
1201 | ||
718e3744 | 1202 | /* Set packet size. */ |
1203 | length = bgp_packet_set_size (s); | |
1204 | ||
1205 | /* Make real packet. */ | |
e83e2080 | 1206 | packet = stream_dup (s); |
718e3744 | 1207 | stream_free (s); |
1208 | ||
1209 | /* Add packet to the peer. */ | |
1210 | bgp_packet_add (peer, packet); | |
1211 | ||
1212 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1213 | zlog_debug ("%s send message type %d, length (incl. header) %d", |
718e3744 | 1214 | peer->host, BGP_MSG_CAPABILITY, length); |
1215 | ||
eb821189 | 1216 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 1217 | } |
6b0655a2 | 1218 | |
718e3744 | 1219 | /* RFC1771 6.8 Connection collision detection. */ |
94f2b392 | 1220 | static int |
eb821189 | 1221 | bgp_collision_detect (struct peer *new, struct in_addr remote_id) |
718e3744 | 1222 | { |
eb821189 | 1223 | struct peer *peer; |
718e3744 | 1224 | |
718e3744 | 1225 | /* Upon receipt of an OPEN message, the local system must examine |
1226 | all of its connections that are in the OpenConfirm state. A BGP | |
1227 | speaker may also examine connections in an OpenSent state if it | |
1228 | knows the BGP Identifier of the peer by means outside of the | |
1229 | protocol. If among these connections there is a connection to a | |
1230 | remote BGP speaker whose BGP Identifier equals the one in the | |
1231 | OPEN message, then the local system performs the following | |
1232 | collision resolution procedure: */ | |
1233 | ||
1ff9a340 | 1234 | if ((peer = new->doppelganger) != NULL) |
718e3744 | 1235 | { |
1ff9a340 DS |
1236 | /* Do not accept the new connection in Established or Clearing states. |
1237 | * Note that a peer GR is handled by closing the existing connection | |
1238 | * upon receipt of new one. | |
1239 | */ | |
1240 | if (peer->status == Established || peer->status == Clearing) | |
1241 | { | |
1242 | bgp_notify_send (new, BGP_NOTIFY_CEASE, | |
1243 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1244 | return (-1); | |
1245 | } | |
1246 | else if ((peer->status == OpenConfirm) || (peer->status == OpenSent)) | |
eb821189 | 1247 | { |
718e3744 | 1248 | /* 1. The BGP Identifier of the local system is compared to |
1249 | the BGP Identifier of the remote system (as specified in | |
1250 | the OPEN message). */ | |
1251 | ||
1252 | if (ntohl (peer->local_id.s_addr) < ntohl (remote_id.s_addr)) | |
1ff9a340 DS |
1253 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
1254 | { | |
1255 | /* 2. If the value of the local BGP Identifier is less | |
1256 | than the remote one, the local system closes BGP | |
1257 | connection that already exists (the one that is | |
1258 | already in the OpenConfirm state), and accepts BGP | |
1259 | connection initiated by the remote system. */ | |
1260 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, | |
1261 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1262 | return 1; | |
1263 | } | |
1264 | else | |
1265 | { | |
1266 | bgp_notify_send (new, BGP_NOTIFY_CEASE, | |
1267 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1268 | return -1; | |
1269 | } | |
718e3744 | 1270 | else |
1271 | { | |
1272 | /* 3. Otherwise, the local system closes newly created | |
1273 | BGP connection (the one associated with the newly | |
1274 | received OPEN message), and continues to use the | |
1275 | existing one (the one that is already in the | |
1276 | OpenConfirm state). */ | |
1ff9a340 DS |
1277 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
1278 | { | |
1279 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, | |
1280 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1281 | return 1; | |
1282 | } | |
1283 | else | |
1284 | { | |
1285 | bgp_notify_send (new, BGP_NOTIFY_CEASE, | |
1286 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1287 | return -1; | |
1288 | } | |
718e3744 | 1289 | } |
eb821189 | 1290 | } |
1291 | } | |
718e3744 | 1292 | return 0; |
1293 | } | |
1294 | ||
94f2b392 | 1295 | static int |
718e3744 | 1296 | bgp_open_receive (struct peer *peer, bgp_size_t size) |
1297 | { | |
1298 | int ret; | |
1299 | u_char version; | |
1300 | u_char optlen; | |
1301 | u_int16_t holdtime; | |
1302 | u_int16_t send_holdtime; | |
1303 | as_t remote_as; | |
0b2aa3a0 | 1304 | as_t as4 = 0; |
1ff9a340 | 1305 | struct peer *active_peer = NULL; |
718e3744 | 1306 | struct in_addr remote_id; |
3b381c32 | 1307 | int mp_capability; |
5228ad27 | 1308 | u_int8_t notify_data_remote_as[2]; |
1309 | u_int8_t notify_data_remote_id[4]; | |
718e3744 | 1310 | |
718e3744 | 1311 | /* Parse open packet. */ |
1312 | version = stream_getc (peer->ibuf); | |
1313 | memcpy (notify_data_remote_as, stream_pnt (peer->ibuf), 2); | |
1314 | remote_as = stream_getw (peer->ibuf); | |
1315 | holdtime = stream_getw (peer->ibuf); | |
1316 | memcpy (notify_data_remote_id, stream_pnt (peer->ibuf), 4); | |
1317 | remote_id.s_addr = stream_get_ipv4 (peer->ibuf); | |
1318 | ||
1319 | /* Receive OPEN message log */ | |
1320 | if (BGP_DEBUG (normal, NORMAL)) | |
aea339f7 | 1321 | zlog_debug ("%s rcv OPEN, version %d, remote-as (in open) %u," |
0b2aa3a0 PJ |
1322 | " holdtime %d, id %s", |
1323 | peer->host, version, remote_as, holdtime, | |
1324 | inet_ntoa (remote_id)); | |
1325 | ||
1326 | /* BEGIN to read the capability here, but dont do it yet */ | |
3b381c32 | 1327 | mp_capability = 0; |
0b2aa3a0 PJ |
1328 | optlen = stream_getc (peer->ibuf); |
1329 | ||
1330 | if (optlen != 0) | |
1331 | { | |
1332 | /* We need the as4 capability value *right now* because | |
1333 | * if it is there, we have not got the remote_as yet, and without | |
1334 | * that we do not know which peer is connecting to us now. | |
1335 | */ | |
1336 | as4 = peek_for_as4_capability (peer, optlen); | |
1337 | } | |
1338 | ||
1339 | /* Just in case we have a silly peer who sends AS4 capability set to 0 */ | |
1340 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV) && !as4) | |
1341 | { | |
1342 | zlog_err ("%s bad OPEN, got AS4 capability, but AS4 set to 0", | |
1343 | peer->host); | |
1344 | bgp_notify_send (peer, BGP_NOTIFY_OPEN_ERR, | |
1345 | BGP_NOTIFY_OPEN_BAD_PEER_AS); | |
1346 | return -1; | |
1347 | } | |
1348 | ||
1349 | if (remote_as == BGP_AS_TRANS) | |
1350 | { | |
1351 | /* Take the AS4 from the capability. We must have received the | |
1352 | * capability now! Otherwise we have a asn16 peer who uses | |
1353 | * BGP_AS_TRANS, for some unknown reason. | |
1354 | */ | |
1355 | if (as4 == BGP_AS_TRANS) | |
1356 | { | |
1357 | zlog_err ("%s [AS4] NEW speaker using AS_TRANS for AS4, not allowed", | |
1358 | peer->host); | |
1ff9a340 DS |
1359 | bgp_notify_send (peer, BGP_NOTIFY_OPEN_ERR, |
1360 | BGP_NOTIFY_OPEN_BAD_PEER_AS); | |
0b2aa3a0 PJ |
1361 | return -1; |
1362 | } | |
1363 | ||
1364 | if (!as4 && BGP_DEBUG (as4, AS4)) | |
1365 | zlog_debug ("%s [AS4] OPEN remote_as is AS_TRANS, but no AS4." | |
1366 | " Odd, but proceeding.", peer->host); | |
1367 | else if (as4 < BGP_AS_MAX && BGP_DEBUG (as4, AS4)) | |
0df7c91f | 1368 | zlog_debug ("%s [AS4] OPEN remote_as is AS_TRANS, but AS4 (%u) fits " |
0b2aa3a0 PJ |
1369 | "in 2-bytes, very odd peer.", peer->host, as4); |
1370 | if (as4) | |
1371 | remote_as = as4; | |
1372 | } | |
1373 | else | |
1374 | { | |
1375 | /* We may have a partner with AS4 who has an asno < BGP_AS_MAX */ | |
1376 | /* If we have got the capability, peer->as4cap must match remote_as */ | |
1377 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV) | |
1378 | && as4 != remote_as) | |
1379 | { | |
1380 | /* raise error, log this, close session */ | |
1381 | zlog_err ("%s bad OPEN, got AS4 capability, but remote_as %u" | |
1382 | " mismatch with 16bit 'myasn' %u in open", | |
1383 | peer->host, as4, remote_as); | |
1384 | bgp_notify_send (peer, BGP_NOTIFY_OPEN_ERR, | |
1385 | BGP_NOTIFY_OPEN_BAD_PEER_AS); | |
1386 | return -1; | |
1387 | } | |
1388 | } | |
1389 | ||
718e3744 | 1390 | /* remote router-id check. */ |
1391 | if (remote_id.s_addr == 0 | |
733cd9e5 | 1392 | || IPV4_CLASS_DE (ntohl (remote_id.s_addr)) |
718e3744 | 1393 | || ntohl (peer->local_id.s_addr) == ntohl (remote_id.s_addr)) |
1394 | { | |
1395 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1396 | zlog_debug ("%s bad OPEN, wrong router identifier %s", |
718e3744 | 1397 | peer->host, inet_ntoa (remote_id)); |
1398 | bgp_notify_send_with_data (peer, | |
1399 | BGP_NOTIFY_OPEN_ERR, | |
1400 | BGP_NOTIFY_OPEN_BAD_BGP_IDENT, | |
1401 | notify_data_remote_id, 4); | |
1402 | return -1; | |
1403 | } | |
1404 | ||
1405 | /* Set remote router-id */ | |
1406 | peer->remote_id = remote_id; | |
1407 | ||
1408 | /* Peer BGP version check. */ | |
1409 | if (version != BGP_VERSION_4) | |
1410 | { | |
a689e6a9 LR |
1411 | u_int16_t maxver = htons(BGP_VERSION_4); |
1412 | /* XXX this reply may not be correct if version < 4 XXX */ | |
718e3744 | 1413 | if (BGP_DEBUG (normal, NORMAL)) |
6b51474d | 1414 | zlog_debug ("%s bad protocol version, remote requested %d, local request %d", |
718e3744 | 1415 | peer->host, version, BGP_VERSION_4); |
a689e6a9 | 1416 | /* Data must be in network byte order here */ |
718e3744 | 1417 | bgp_notify_send_with_data (peer, |
1418 | BGP_NOTIFY_OPEN_ERR, | |
1419 | BGP_NOTIFY_OPEN_UNSUP_VERSION, | |
a689e6a9 | 1420 | (u_int8_t *) &maxver, 2); |
718e3744 | 1421 | return -1; |
1422 | } | |
1423 | ||
1424 | /* Check neighbor as number. */ | |
1425 | if (remote_as != peer->as) | |
1426 | { | |
1427 | if (BGP_DEBUG (normal, NORMAL)) | |
aea339f7 | 1428 | zlog_debug ("%s bad OPEN, remote AS is %u, expected %u", |
718e3744 | 1429 | peer->host, remote_as, peer->as); |
1430 | bgp_notify_send_with_data (peer, | |
1431 | BGP_NOTIFY_OPEN_ERR, | |
1432 | BGP_NOTIFY_OPEN_BAD_PEER_AS, | |
1433 | notify_data_remote_as, 2); | |
1434 | return -1; | |
1435 | } | |
1436 | ||
1437 | /* From the rfc: Upon receipt of an OPEN message, a BGP speaker MUST | |
1438 | calculate the value of the Hold Timer by using the smaller of its | |
1439 | configured Hold Time and the Hold Time received in the OPEN message. | |
1440 | The Hold Time MUST be either zero or at least three seconds. An | |
1441 | implementation may reject connections on the basis of the Hold Time. */ | |
1442 | ||
1443 | if (holdtime < 3 && holdtime != 0) | |
1444 | { | |
1445 | bgp_notify_send (peer, | |
1446 | BGP_NOTIFY_OPEN_ERR, | |
1447 | BGP_NOTIFY_OPEN_UNACEP_HOLDTIME); | |
1448 | return -1; | |
1449 | } | |
1450 | ||
1451 | /* From the rfc: A reasonable maximum time between KEEPALIVE messages | |
1452 | would be one third of the Hold Time interval. KEEPALIVE messages | |
1453 | MUST NOT be sent more frequently than one per second. An | |
1454 | implementation MAY adjust the rate at which it sends KEEPALIVE | |
1455 | messages as a function of the Hold Time interval. */ | |
1456 | ||
1457 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
1458 | send_holdtime = peer->holdtime; | |
1459 | else | |
1460 | send_holdtime = peer->bgp->default_holdtime; | |
1461 | ||
1462 | if (holdtime < send_holdtime) | |
1463 | peer->v_holdtime = holdtime; | |
1464 | else | |
1465 | peer->v_holdtime = send_holdtime; | |
1466 | ||
1467 | peer->v_keepalive = peer->v_holdtime / 3; | |
1468 | ||
1469 | /* Open option part parse. */ | |
718e3744 | 1470 | if (optlen != 0) |
1471 | { | |
3b381c32 | 1472 | if ((ret = bgp_open_option_parse (peer, optlen, &mp_capability)) < 0) |
5861739f PJ |
1473 | { |
1474 | bgp_notify_send (peer, | |
1475 | BGP_NOTIFY_OPEN_ERR, | |
1476 | BGP_NOTIFY_OPEN_UNACEP_HOLDTIME); | |
1477 | return ret; | |
1478 | } | |
718e3744 | 1479 | } |
1480 | else | |
1481 | { | |
1482 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1483 | zlog_debug ("%s rcvd OPEN w/ OPTION parameter len: 0", |
718e3744 | 1484 | peer->host); |
1485 | } | |
1486 | ||
3b381c32 AS |
1487 | /* |
1488 | * Assume that the peer supports the locally configured set of | |
1489 | * AFI/SAFIs if the peer did not send us any Mulitiprotocol | |
1490 | * capabilities, or if 'override-capability' is configured. | |
1491 | */ | |
1492 | if (! mp_capability || | |
1493 | CHECK_FLAG (peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY)) | |
718e3744 | 1494 | { |
1495 | peer->afc_nego[AFI_IP][SAFI_UNICAST] = peer->afc[AFI_IP][SAFI_UNICAST]; | |
1496 | peer->afc_nego[AFI_IP][SAFI_MULTICAST] = peer->afc[AFI_IP][SAFI_MULTICAST]; | |
1497 | peer->afc_nego[AFI_IP6][SAFI_UNICAST] = peer->afc[AFI_IP6][SAFI_UNICAST]; | |
1498 | peer->afc_nego[AFI_IP6][SAFI_MULTICAST] = peer->afc[AFI_IP6][SAFI_MULTICAST]; | |
1499 | } | |
1500 | ||
1ff9a340 DS |
1501 | /* When collision is detected and this peer is closed. Retrun |
1502 | immidiately. */ | |
1503 | ret = bgp_collision_detect (peer, remote_id); | |
1504 | if (ret < 0) | |
1505 | return ret; | |
1506 | ||
718e3744 | 1507 | /* Get sockname. */ |
1ff9a340 DS |
1508 | if ((ret = bgp_getsockname (peer)) < 0) |
1509 | { | |
1510 | zlog_err("%s: bgp_getsockname() failed for peer: %s", __FUNCTION__, | |
1511 | peer->host); | |
1512 | return (ret); | |
1513 | } | |
718e3744 | 1514 | |
1ff9a340 DS |
1515 | if ((ret = bgp_event_update(peer, Receive_OPEN_message)) < 0) |
1516 | { | |
1517 | zlog_err("%s: BGP event update failed for peer: %s", __FUNCTION__, | |
1518 | peer->host); | |
1519 | /* DD: bgp send notify and reset state */ | |
1520 | return (ret); | |
1521 | } | |
718e3744 | 1522 | |
1523 | peer->packet_size = 0; | |
1524 | if (peer->ibuf) | |
1525 | stream_reset (peer->ibuf); | |
1526 | ||
1527 | return 0; | |
1528 | } | |
1529 | ||
f188f2c4 DS |
1530 | /* Called when there is a change in the EOR(implicit or explicit) status of a peer. |
1531 | Ends the update-delay if all expected peers are done with EORs. */ | |
1532 | void | |
1533 | bgp_check_update_delay(struct bgp *bgp) | |
1534 | { | |
1535 | struct listnode *node, *nnode; | |
1536 | struct peer *peer; | |
1537 | ||
1538 | if (BGP_DEBUG (normal, NORMAL)) | |
1539 | zlog_debug ("Checking update delay, T: %d R: %d I:%d E: %d", bgp->established, | |
1540 | bgp->restarted_peers, bgp->implicit_eors, bgp->explicit_eors); | |
1541 | ||
1542 | if (bgp->established <= | |
1543 | bgp->restarted_peers + bgp->implicit_eors + bgp->explicit_eors) | |
1544 | { | |
1545 | /* This is an extra sanity check to make sure we wait for all the | |
1546 | eligible configured peers. This check is performed if establish wait | |
1547 | timer is on, or establish wait option is not given with the | |
1548 | update-delay command */ | |
1549 | if (bgp->t_establish_wait || | |
1550 | (bgp->v_establish_wait == bgp->v_update_delay)) | |
1551 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
1552 | { | |
1ff9a340 DS |
1553 | if (CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1554 | && !CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN) | |
f188f2c4 DS |
1555 | && !peer->update_delay_over) |
1556 | { | |
1557 | if (BGP_DEBUG (normal, NORMAL)) | |
1558 | zlog_debug (" Peer %s pending, continuing read-only mode", | |
1559 | peer->host); | |
1560 | return; | |
1561 | } | |
1562 | } | |
1563 | ||
1564 | zlog_info ("Update delay ended, restarted: %d, EORs implicit: %d, explicit: %d", | |
1565 | bgp->restarted_peers, bgp->implicit_eors, bgp->explicit_eors); | |
1566 | bgp_update_delay_end(bgp); | |
1567 | } | |
1568 | } | |
1569 | ||
1570 | /* Called if peer is known to have restarted. The restart-state bit in | |
1571 | Graceful-Restart capability is used for that */ | |
1572 | void | |
1573 | bgp_update_restarted_peers (struct peer *peer) | |
1574 | { | |
1575 | if (!bgp_update_delay_active(peer->bgp)) return; /* BGP update delay has ended */ | |
1576 | if (peer->update_delay_over) return; /* This peer has already been considered */ | |
1577 | ||
1578 | if (BGP_DEBUG (normal, NORMAL)) | |
1579 | zlog_debug ("Peer %s: Checking restarted", peer->host); | |
1580 | ||
1581 | if (peer->status == Established) | |
1582 | { | |
1583 | peer->update_delay_over = 1; | |
1584 | peer->bgp->restarted_peers++; | |
1585 | bgp_check_update_delay(peer->bgp); | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | /* Called as peer receives a keep-alive. Determines if this occurence can be | |
1590 | taken as an implicit EOR for this peer. | |
1591 | NOTE: The very first keep-alive after the Established state of a peer is | |
1592 | considered implicit EOR for the update-delay purposes */ | |
1593 | void | |
1594 | bgp_update_implicit_eors (struct peer *peer) | |
1595 | { | |
1596 | if (!bgp_update_delay_active(peer->bgp)) return; /* BGP update delay has ended */ | |
1597 | if (peer->update_delay_over) return; /* This peer has already been considered */ | |
1598 | ||
1599 | if (BGP_DEBUG (normal, NORMAL)) | |
1600 | zlog_debug ("Peer %s: Checking implicit EORs", peer->host); | |
1601 | ||
1602 | if (peer->status == Established) | |
1603 | { | |
1604 | peer->update_delay_over = 1; | |
1605 | peer->bgp->implicit_eors++; | |
1606 | bgp_check_update_delay(peer->bgp); | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | /* Should be called only when there is a change in the EOR_RECEIVED status | |
1611 | for any afi/safi on a peer */ | |
1612 | static void | |
1613 | bgp_update_explicit_eors (struct peer *peer) | |
1614 | { | |
1615 | afi_t afi; | |
1616 | safi_t safi; | |
1617 | ||
1618 | if (!bgp_update_delay_active(peer->bgp)) return; /* BGP update delay has ended */ | |
1619 | if (peer->update_delay_over) return; /* This peer has already been considered */ | |
1620 | ||
1621 | if (BGP_DEBUG (normal, NORMAL)) | |
1622 | zlog_debug ("Peer %s: Checking explicit EORs", peer->host); | |
1623 | ||
1624 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
1625 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
1626 | { | |
1627 | if (peer->afc_nego[afi][safi] && | |
1628 | !CHECK_FLAG(peer->af_sflags[afi][safi], PEER_STATUS_EOR_RECEIVED)) | |
1629 | { | |
1630 | if (BGP_DEBUG (normal, NORMAL)) | |
1631 | zlog_debug (" afi %d safi %d didnt receive EOR", afi, safi); | |
1632 | return; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | peer->update_delay_over = 1; | |
1637 | peer->bgp->explicit_eors++; | |
1638 | bgp_check_update_delay(peer->bgp); | |
1639 | } | |
1640 | ||
718e3744 | 1641 | /* Parse BGP Update packet and make attribute object. */ |
94f2b392 | 1642 | static int |
718e3744 | 1643 | bgp_update_receive (struct peer *peer, bgp_size_t size) |
1644 | { | |
1645 | int ret; | |
1646 | u_char *end; | |
1647 | struct stream *s; | |
1648 | struct attr attr; | |
489d005a | 1649 | struct attr_extra extra; |
718e3744 | 1650 | bgp_size_t attribute_len; |
1651 | bgp_size_t update_len; | |
1652 | bgp_size_t withdraw_len; | |
1653 | struct bgp_nlri update; | |
1654 | struct bgp_nlri withdraw; | |
1655 | struct bgp_nlri mp_update; | |
1656 | struct bgp_nlri mp_withdraw; | |
718e3744 | 1657 | |
1658 | /* Status must be Established. */ | |
1659 | if (peer->status != Established) | |
1660 | { | |
1661 | zlog_err ("%s [FSM] Update packet received under status %s", | |
1662 | peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
1663 | bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1664 | return -1; | |
1665 | } | |
1666 | ||
1667 | /* Set initial values. */ | |
1668 | memset (&attr, 0, sizeof (struct attr)); | |
489d005a | 1669 | memset (&extra, 0, sizeof (struct attr_extra)); |
718e3744 | 1670 | memset (&update, 0, sizeof (struct bgp_nlri)); |
1671 | memset (&withdraw, 0, sizeof (struct bgp_nlri)); | |
1672 | memset (&mp_update, 0, sizeof (struct bgp_nlri)); | |
1673 | memset (&mp_withdraw, 0, sizeof (struct bgp_nlri)); | |
489d005a | 1674 | attr.extra = &extra; |
718e3744 | 1675 | |
1676 | s = peer->ibuf; | |
1677 | end = stream_pnt (s) + size; | |
1678 | ||
1679 | /* RFC1771 6.3 If the Unfeasible Routes Length or Total Attribute | |
1680 | Length is too large (i.e., if Unfeasible Routes Length + Total | |
1681 | Attribute Length + 23 exceeds the message Length), then the Error | |
1682 | Subcode is set to Malformed Attribute List. */ | |
1683 | if (stream_pnt (s) + 2 > end) | |
1684 | { | |
1685 | zlog_err ("%s [Error] Update packet error" | |
1686 | " (packet length is short for unfeasible length)", | |
1687 | peer->host); | |
1688 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1689 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1690 | return -1; | |
1691 | } | |
1692 | ||
1693 | /* Unfeasible Route Length. */ | |
1694 | withdraw_len = stream_getw (s); | |
1695 | ||
1696 | /* Unfeasible Route Length check. */ | |
1697 | if (stream_pnt (s) + withdraw_len > end) | |
1698 | { | |
1699 | zlog_err ("%s [Error] Update packet error" | |
1700 | " (packet unfeasible length overflow %d)", | |
1701 | peer->host, withdraw_len); | |
1702 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1703 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1704 | return -1; | |
1705 | } | |
1706 | ||
1707 | /* Unfeasible Route packet format check. */ | |
1708 | if (withdraw_len > 0) | |
1709 | { | |
1710 | ret = bgp_nlri_sanity_check (peer, AFI_IP, stream_pnt (s), withdraw_len); | |
1711 | if (ret < 0) | |
1712 | return -1; | |
1713 | ||
1714 | if (BGP_DEBUG (packet, PACKET_RECV)) | |
6b51474d | 1715 | zlog_debug ("%s [Update:RECV] Unfeasible NLRI received", peer->host); |
718e3744 | 1716 | |
1717 | withdraw.afi = AFI_IP; | |
1718 | withdraw.safi = SAFI_UNICAST; | |
1719 | withdraw.nlri = stream_pnt (s); | |
1720 | withdraw.length = withdraw_len; | |
9985f83c | 1721 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1722 | } |
1723 | ||
1724 | /* Attribute total length check. */ | |
1725 | if (stream_pnt (s) + 2 > end) | |
1726 | { | |
1727 | zlog_warn ("%s [Error] Packet Error" | |
1728 | " (update packet is short for attribute length)", | |
1729 | peer->host); | |
1730 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1731 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1732 | return -1; | |
1733 | } | |
1734 | ||
1735 | /* Fetch attribute total length. */ | |
1736 | attribute_len = stream_getw (s); | |
1737 | ||
1738 | /* Attribute length check. */ | |
1739 | if (stream_pnt (s) + attribute_len > end) | |
1740 | { | |
1741 | zlog_warn ("%s [Error] Packet Error" | |
1742 | " (update packet attribute length overflow %d)", | |
1743 | peer->host, attribute_len); | |
1744 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, | |
1745 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1746 | return -1; | |
1747 | } | |
b881c707 PJ |
1748 | |
1749 | /* Certain attribute parsing errors should not be considered bad enough | |
1750 | * to reset the session for, most particularly any partial/optional | |
1751 | * attributes that have 'tunneled' over speakers that don't understand | |
1752 | * them. Instead we withdraw only the prefix concerned. | |
1753 | * | |
1754 | * Complicates the flow a little though.. | |
1755 | */ | |
1756 | bgp_attr_parse_ret_t attr_parse_ret = BGP_ATTR_PARSE_PROCEED; | |
1757 | /* This define morphs the update case into a withdraw when lower levels | |
1758 | * have signalled an error condition where this is best. | |
1759 | */ | |
1760 | #define NLRI_ATTR_ARG (attr_parse_ret != BGP_ATTR_PARSE_WITHDRAW ? &attr : NULL) | |
718e3744 | 1761 | |
1762 | /* Parse attribute when it exists. */ | |
1763 | if (attribute_len) | |
1764 | { | |
b881c707 | 1765 | attr_parse_ret = bgp_attr_parse (peer, &attr, attribute_len, |
718e3744 | 1766 | &mp_update, &mp_withdraw); |
b881c707 | 1767 | if (attr_parse_ret == BGP_ATTR_PARSE_ERROR) |
f80f838b DL |
1768 | { |
1769 | bgp_attr_unintern_sub (&attr); | |
1770 | return -1; | |
1771 | } | |
718e3744 | 1772 | } |
b881c707 | 1773 | |
718e3744 | 1774 | /* Logging the attribute. */ |
b881c707 PJ |
1775 | if (attr_parse_ret == BGP_ATTR_PARSE_WITHDRAW |
1776 | || BGP_DEBUG (update, UPDATE_IN)) | |
718e3744 | 1777 | { |
14542f3e JBD |
1778 | char attrstr[BUFSIZ]; |
1779 | attrstr[0] = '\0'; | |
1780 | ||
e01f9cbb | 1781 | ret= bgp_dump_attr (peer, &attr, attrstr, BUFSIZ); |
b881c707 PJ |
1782 | int lvl = (attr_parse_ret == BGP_ATTR_PARSE_WITHDRAW) |
1783 | ? LOG_ERR : LOG_DEBUG; | |
1784 | ||
1785 | if (attr_parse_ret == BGP_ATTR_PARSE_WITHDRAW) | |
1786 | zlog (peer->log, LOG_ERR, | |
1787 | "%s rcvd UPDATE with errors in attr(s)!! Withdrawing route.", | |
1788 | peer->host); | |
e01f9cbb | 1789 | |
1790 | if (ret) | |
b881c707 | 1791 | zlog (peer->log, lvl, "%s rcvd UPDATE w/ attr: %s", |
e01f9cbb | 1792 | peer->host, attrstr); |
718e3744 | 1793 | } |
b881c707 | 1794 | |
718e3744 | 1795 | /* Network Layer Reachability Information. */ |
1796 | update_len = end - stream_pnt (s); | |
1797 | ||
1798 | if (update_len) | |
1799 | { | |
1800 | /* Check NLRI packet format and prefix length. */ | |
1801 | ret = bgp_nlri_sanity_check (peer, AFI_IP, stream_pnt (s), update_len); | |
1802 | if (ret < 0) | |
b881c707 PJ |
1803 | { |
1804 | bgp_attr_unintern_sub (&attr); | |
b881c707 PJ |
1805 | return -1; |
1806 | } | |
718e3744 | 1807 | |
1808 | /* Set NLRI portion to structure. */ | |
1809 | update.afi = AFI_IP; | |
1810 | update.safi = SAFI_UNICAST; | |
1811 | update.nlri = stream_pnt (s); | |
1812 | update.length = update_len; | |
9985f83c | 1813 | stream_forward_getp (s, update_len); |
718e3744 | 1814 | } |
1815 | ||
1816 | /* NLRI is processed only when the peer is configured specific | |
1817 | Address Family and Subsequent Address Family. */ | |
1818 | if (peer->afc[AFI_IP][SAFI_UNICAST]) | |
1819 | { | |
1820 | if (withdraw.length) | |
1821 | bgp_nlri_parse (peer, NULL, &withdraw); | |
1822 | ||
1823 | if (update.length) | |
1824 | { | |
1825 | /* We check well-known attribute only for IPv4 unicast | |
1826 | update. */ | |
1827 | ret = bgp_attr_check (peer, &attr); | |
1828 | if (ret < 0) | |
b881c707 PJ |
1829 | { |
1830 | bgp_attr_unintern_sub (&attr); | |
b881c707 PJ |
1831 | return -1; |
1832 | } | |
718e3744 | 1833 | |
b881c707 | 1834 | bgp_nlri_parse (peer, NLRI_ATTR_ARG, &update); |
718e3744 | 1835 | } |
e01f9cbb | 1836 | |
f418446b | 1837 | if (mp_update.length |
1838 | && mp_update.afi == AFI_IP | |
1839 | && mp_update.safi == SAFI_UNICAST) | |
b881c707 | 1840 | bgp_nlri_parse (peer, NLRI_ATTR_ARG, &mp_update); |
f418446b | 1841 | |
1842 | if (mp_withdraw.length | |
1843 | && mp_withdraw.afi == AFI_IP | |
1844 | && mp_withdraw.safi == SAFI_UNICAST) | |
1845 | bgp_nlri_parse (peer, NULL, &mp_withdraw); | |
1846 | ||
e01f9cbb | 1847 | if (! attribute_len && ! withdraw_len) |
1848 | { | |
1849 | /* End-of-RIB received */ | |
f188f2c4 DS |
1850 | if (!CHECK_FLAG(peer->af_sflags[AFI_IP][SAFI_UNICAST], |
1851 | PEER_STATUS_EOR_RECEIVED)) | |
1852 | { | |
1853 | SET_FLAG (peer->af_sflags[AFI_IP][SAFI_UNICAST], | |
1854 | PEER_STATUS_EOR_RECEIVED); | |
1855 | bgp_update_explicit_eors(peer); | |
1856 | } | |
e01f9cbb | 1857 | |
93406d87 | 1858 | /* NSF delete stale route */ |
1859 | if (peer->nsf[AFI_IP][SAFI_UNICAST]) | |
1860 | bgp_clear_stale_route (peer, AFI_IP, SAFI_UNICAST); | |
1861 | ||
1862 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1863 | zlog (peer->log, LOG_DEBUG, "rcvd End-of-RIB for IPv4 Unicast from %s", |
e01f9cbb | 1864 | peer->host); |
1865 | } | |
718e3744 | 1866 | } |
1867 | if (peer->afc[AFI_IP][SAFI_MULTICAST]) | |
1868 | { | |
1869 | if (mp_update.length | |
1870 | && mp_update.afi == AFI_IP | |
1871 | && mp_update.safi == SAFI_MULTICAST) | |
b881c707 | 1872 | bgp_nlri_parse (peer, NLRI_ATTR_ARG, &mp_update); |
718e3744 | 1873 | |
1874 | if (mp_withdraw.length | |
1875 | && mp_withdraw.afi == AFI_IP | |
1876 | && mp_withdraw.safi == SAFI_MULTICAST) | |
1877 | bgp_nlri_parse (peer, NULL, &mp_withdraw); | |
e01f9cbb | 1878 | |
93406d87 | 1879 | if (! withdraw_len |
e01f9cbb | 1880 | && mp_withdraw.afi == AFI_IP |
1881 | && mp_withdraw.safi == SAFI_MULTICAST | |
1882 | && mp_withdraw.length == 0) | |
1883 | { | |
1884 | /* End-of-RIB received */ | |
f188f2c4 DS |
1885 | if (!CHECK_FLAG (peer->af_sflags[AFI_IP][SAFI_MULTICAST], |
1886 | PEER_STATUS_EOR_RECEIVED)) | |
1887 | { | |
1888 | SET_FLAG (peer->af_sflags[AFI_IP][SAFI_MULTICAST], | |
1889 | PEER_STATUS_EOR_RECEIVED); | |
1890 | bgp_update_explicit_eors(peer); | |
1891 | } | |
e01f9cbb | 1892 | |
93406d87 | 1893 | /* NSF delete stale route */ |
1894 | if (peer->nsf[AFI_IP][SAFI_MULTICAST]) | |
1895 | bgp_clear_stale_route (peer, AFI_IP, SAFI_MULTICAST); | |
1896 | ||
1897 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1898 | zlog (peer->log, LOG_DEBUG, "rcvd End-of-RIB for IPv4 Multicast from %s", |
e01f9cbb | 1899 | peer->host); |
1900 | } | |
718e3744 | 1901 | } |
1902 | if (peer->afc[AFI_IP6][SAFI_UNICAST]) | |
1903 | { | |
1904 | if (mp_update.length | |
1905 | && mp_update.afi == AFI_IP6 | |
1906 | && mp_update.safi == SAFI_UNICAST) | |
b881c707 | 1907 | bgp_nlri_parse (peer, NLRI_ATTR_ARG, &mp_update); |
718e3744 | 1908 | |
1909 | if (mp_withdraw.length | |
1910 | && mp_withdraw.afi == AFI_IP6 | |
1911 | && mp_withdraw.safi == SAFI_UNICAST) | |
1912 | bgp_nlri_parse (peer, NULL, &mp_withdraw); | |
e01f9cbb | 1913 | |
93406d87 | 1914 | if (! withdraw_len |
e01f9cbb | 1915 | && mp_withdraw.afi == AFI_IP6 |
1916 | && mp_withdraw.safi == SAFI_UNICAST | |
1917 | && mp_withdraw.length == 0) | |
1918 | { | |
1919 | /* End-of-RIB received */ | |
f188f2c4 DS |
1920 | if (!CHECK_FLAG (peer->af_sflags[AFI_IP6][SAFI_UNICAST], |
1921 | PEER_STATUS_EOR_RECEIVED)) | |
1922 | { | |
1923 | SET_FLAG (peer->af_sflags[AFI_IP6][SAFI_UNICAST], PEER_STATUS_EOR_RECEIVED); | |
1924 | bgp_update_explicit_eors(peer); | |
1925 | } | |
e01f9cbb | 1926 | |
93406d87 | 1927 | /* NSF delete stale route */ |
1928 | if (peer->nsf[AFI_IP6][SAFI_UNICAST]) | |
1929 | bgp_clear_stale_route (peer, AFI_IP6, SAFI_UNICAST); | |
1930 | ||
1931 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 1932 | zlog (peer->log, LOG_DEBUG, "rcvd End-of-RIB for IPv6 Unicast from %s", |
e01f9cbb | 1933 | peer->host); |
1934 | } | |
718e3744 | 1935 | } |
1936 | if (peer->afc[AFI_IP6][SAFI_MULTICAST]) | |
1937 | { | |
1938 | if (mp_update.length | |
1939 | && mp_update.afi == AFI_IP6 | |
1940 | && mp_update.safi == SAFI_MULTICAST) | |
b881c707 | 1941 | bgp_nlri_parse (peer, NLRI_ATTR_ARG, &mp_update); |
718e3744 | 1942 | |
1943 | if (mp_withdraw.length | |
1944 | && mp_withdraw.afi == AFI_IP6 | |
1945 | && mp_withdraw.safi == SAFI_MULTICAST) | |
1946 | bgp_nlri_parse (peer, NULL, &mp_withdraw); | |
e01f9cbb | 1947 | |
93406d87 | 1948 | if (! withdraw_len |
e01f9cbb | 1949 | && mp_withdraw.afi == AFI_IP6 |
1950 | && mp_withdraw.safi == SAFI_MULTICAST | |
1951 | && mp_withdraw.length == 0) | |
1952 | { | |
1953 | /* End-of-RIB received */ | |
f188f2c4 DS |
1954 | if (!CHECK_FLAG (peer->af_sflags[AFI_IP6][SAFI_MULTICAST], |
1955 | PEER_STATUS_EOR_RECEIVED)) | |
1956 | { | |
1957 | SET_FLAG (peer->af_sflags[AFI_IP6][SAFI_MULTICAST], PEER_STATUS_EOR_RECEIVED); | |
1958 | bgp_update_explicit_eors(peer); | |
1959 | } | |
1960 | ||
e01f9cbb | 1961 | |
93406d87 | 1962 | /* NSF delete stale route */ |
1963 | if (peer->nsf[AFI_IP6][SAFI_MULTICAST]) | |
1964 | bgp_clear_stale_route (peer, AFI_IP6, SAFI_MULTICAST); | |
1965 | ||
e01f9cbb | 1966 | if (BGP_DEBUG (update, UPDATE_IN)) |
6b51474d | 1967 | zlog (peer->log, LOG_DEBUG, "rcvd End-of-RIB for IPv6 Multicast from %s", |
e01f9cbb | 1968 | peer->host); |
1969 | } | |
718e3744 | 1970 | } |
1971 | if (peer->afc[AFI_IP][SAFI_MPLS_VPN]) | |
1972 | { | |
1973 | if (mp_update.length | |
1974 | && mp_update.afi == AFI_IP | |
42e6d745 | 1975 | && mp_update.safi == SAFI_MPLS_LABELED_VPN) |
b881c707 | 1976 | bgp_nlri_parse_vpnv4 (peer, NLRI_ATTR_ARG, &mp_update); |
718e3744 | 1977 | |
1978 | if (mp_withdraw.length | |
1979 | && mp_withdraw.afi == AFI_IP | |
42e6d745 | 1980 | && mp_withdraw.safi == SAFI_MPLS_LABELED_VPN) |
718e3744 | 1981 | bgp_nlri_parse_vpnv4 (peer, NULL, &mp_withdraw); |
e01f9cbb | 1982 | |
93406d87 | 1983 | if (! withdraw_len |
e01f9cbb | 1984 | && mp_withdraw.afi == AFI_IP |
42e6d745 | 1985 | && mp_withdraw.safi == SAFI_MPLS_LABELED_VPN |
e01f9cbb | 1986 | && mp_withdraw.length == 0) |
1987 | { | |
1988 | /* End-of-RIB received */ | |
f188f2c4 DS |
1989 | if (!CHECK_FLAG (peer->af_sflags[AFI_IP][SAFI_MPLS_VPN], |
1990 | PEER_STATUS_EOR_RECEIVED)) | |
1991 | { | |
1992 | SET_FLAG (peer->af_sflags[AFI_IP][SAFI_MPLS_VPN], PEER_STATUS_EOR_RECEIVED); | |
1993 | bgp_update_explicit_eors(peer); | |
1994 | } | |
e01f9cbb | 1995 | |
1996 | if (BGP_DEBUG (update, UPDATE_IN)) | |
6b51474d | 1997 | zlog (peer->log, LOG_DEBUG, "rcvd End-of-RIB for VPNv4 Unicast from %s", |
e01f9cbb | 1998 | peer->host); |
1999 | } | |
718e3744 | 2000 | } |
2001 | ||
2002 | /* Everything is done. We unintern temporary structures which | |
2003 | interned in bgp_attr_parse(). */ | |
b881c707 | 2004 | bgp_attr_unintern_sub (&attr); |
489d005a | 2005 | |
718e3744 | 2006 | /* If peering is stopped due to some reason, do not generate BGP |
2007 | event. */ | |
2008 | if (peer->status != Established) | |
2009 | return 0; | |
2010 | ||
2011 | /* Increment packet counter. */ | |
2012 | peer->update_in++; | |
65957886 | 2013 | peer->update_time = bgp_clock (); |
718e3744 | 2014 | |
e2c38e6c | 2015 | /* Rearm holdtime timer */ |
6a4677b7 | 2016 | BGP_TIMER_OFF (peer->t_holdtime); |
e2c38e6c | 2017 | bgp_timer_set (peer); |
718e3744 | 2018 | |
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | /* Notify message treatment function. */ | |
94f2b392 | 2023 | static void |
718e3744 | 2024 | bgp_notify_receive (struct peer *peer, bgp_size_t size) |
2025 | { | |
2026 | struct bgp_notify bgp_notify; | |
2027 | ||
2028 | if (peer->notify.data) | |
2029 | { | |
2030 | XFREE (MTYPE_TMP, peer->notify.data); | |
2031 | peer->notify.data = NULL; | |
2032 | peer->notify.length = 0; | |
2033 | } | |
2034 | ||
2035 | bgp_notify.code = stream_getc (peer->ibuf); | |
2036 | bgp_notify.subcode = stream_getc (peer->ibuf); | |
2037 | bgp_notify.length = size - 2; | |
2038 | bgp_notify.data = NULL; | |
2039 | ||
2040 | /* Preserv notify code and sub code. */ | |
2041 | peer->notify.code = bgp_notify.code; | |
2042 | peer->notify.subcode = bgp_notify.subcode; | |
2043 | /* For further diagnostic record returned Data. */ | |
2044 | if (bgp_notify.length) | |
2045 | { | |
2046 | peer->notify.length = size - 2; | |
2047 | peer->notify.data = XMALLOC (MTYPE_TMP, size - 2); | |
2048 | memcpy (peer->notify.data, stream_pnt (peer->ibuf), size - 2); | |
2049 | } | |
2050 | ||
2051 | /* For debug */ | |
2052 | { | |
2053 | int i; | |
2054 | int first = 0; | |
2055 | char c[4]; | |
2056 | ||
2057 | if (bgp_notify.length) | |
2058 | { | |
2059 | bgp_notify.data = XMALLOC (MTYPE_TMP, bgp_notify.length * 3); | |
2060 | for (i = 0; i < bgp_notify.length; i++) | |
2061 | if (first) | |
2062 | { | |
2063 | sprintf (c, " %02x", stream_getc (peer->ibuf)); | |
2064 | strcat (bgp_notify.data, c); | |
2065 | } | |
2066 | else | |
2067 | { | |
2068 | first = 1; | |
2069 | sprintf (c, "%02x", stream_getc (peer->ibuf)); | |
2070 | strcpy (bgp_notify.data, c); | |
2071 | } | |
2072 | } | |
2073 | ||
2074 | bgp_notify_print(peer, &bgp_notify, "received"); | |
2075 | if (bgp_notify.data) | |
2076 | XFREE (MTYPE_TMP, bgp_notify.data); | |
2077 | } | |
2078 | ||
2079 | /* peer count update */ | |
2080 | peer->notify_in++; | |
2081 | ||
e0701b79 | 2082 | if (peer->status == Established) |
2083 | peer->last_reset = PEER_DOWN_NOTIFY_RECEIVED; | |
2084 | ||
718e3744 | 2085 | /* We have to check for Notify with Unsupported Optional Parameter. |
2086 | in that case we fallback to open without the capability option. | |
2087 | But this done in bgp_stop. We just mark it here to avoid changing | |
2088 | the fsm tables. */ | |
2089 | if (bgp_notify.code == BGP_NOTIFY_OPEN_ERR && | |
2090 | bgp_notify.subcode == BGP_NOTIFY_OPEN_UNSUP_PARAM ) | |
2091 | UNSET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
2092 | ||
718e3744 | 2093 | BGP_EVENT_ADD (peer, Receive_NOTIFICATION_message); |
2094 | } | |
2095 | ||
2096 | /* Keepalive treatment function -- get keepalive send keepalive */ | |
94f2b392 | 2097 | static void |
718e3744 | 2098 | bgp_keepalive_receive (struct peer *peer, bgp_size_t size) |
2099 | { | |
2100 | if (BGP_DEBUG (keepalive, KEEPALIVE)) | |
6b51474d | 2101 | zlog_debug ("%s KEEPALIVE rcvd", peer->host); |
718e3744 | 2102 | |
2103 | BGP_EVENT_ADD (peer, Receive_KEEPALIVE_message); | |
2104 | } | |
2105 | ||
2106 | /* Route refresh message is received. */ | |
94f2b392 | 2107 | static void |
718e3744 | 2108 | bgp_route_refresh_receive (struct peer *peer, bgp_size_t size) |
2109 | { | |
2110 | afi_t afi; | |
2111 | safi_t safi; | |
2112 | u_char reserved; | |
2113 | struct stream *s; | |
2114 | ||
2115 | /* If peer does not have the capability, send notification. */ | |
2116 | if (! CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_ADV)) | |
2117 | { | |
2118 | plog_err (peer->log, "%s [Error] BGP route refresh is not enabled", | |
2119 | peer->host); | |
2120 | bgp_notify_send (peer, | |
2121 | BGP_NOTIFY_HEADER_ERR, | |
2122 | BGP_NOTIFY_HEADER_BAD_MESTYPE); | |
2123 | return; | |
2124 | } | |
2125 | ||
2126 | /* Status must be Established. */ | |
2127 | if (peer->status != Established) | |
2128 | { | |
2129 | plog_err (peer->log, | |
2130 | "%s [Error] Route refresh packet received under status %s", | |
2131 | peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
2132 | bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0); | |
2133 | return; | |
2134 | } | |
2135 | ||
2136 | s = peer->ibuf; | |
2137 | ||
2138 | /* Parse packet. */ | |
2139 | afi = stream_getw (s); | |
2140 | reserved = stream_getc (s); | |
2141 | safi = stream_getc (s); | |
2142 | ||
2143 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2144 | zlog_debug ("%s rcvd REFRESH_REQ for afi/safi: %d/%d", |
718e3744 | 2145 | peer->host, afi, safi); |
2146 | ||
2147 | /* Check AFI and SAFI. */ | |
2148 | if ((afi != AFI_IP && afi != AFI_IP6) | |
2149 | || (safi != SAFI_UNICAST && safi != SAFI_MULTICAST | |
42e6d745 | 2150 | && safi != SAFI_MPLS_LABELED_VPN)) |
718e3744 | 2151 | { |
2152 | if (BGP_DEBUG (normal, NORMAL)) | |
2153 | { | |
6b51474d | 2154 | zlog_debug ("%s REFRESH_REQ for unrecognized afi/safi: %d/%d - ignored", |
718e3744 | 2155 | peer->host, afi, safi); |
2156 | } | |
2157 | return; | |
2158 | } | |
2159 | ||
2160 | /* Adjust safi code. */ | |
42e6d745 | 2161 | if (safi == SAFI_MPLS_LABELED_VPN) |
718e3744 | 2162 | safi = SAFI_MPLS_VPN; |
2163 | ||
2164 | if (size != BGP_MSG_ROUTE_REFRESH_MIN_SIZE - BGP_HEADER_SIZE) | |
2165 | { | |
2166 | u_char *end; | |
2167 | u_char when_to_refresh; | |
2168 | u_char orf_type; | |
2169 | u_int16_t orf_len; | |
2170 | ||
2171 | if (size - (BGP_MSG_ROUTE_REFRESH_MIN_SIZE - BGP_HEADER_SIZE) < 5) | |
2172 | { | |
2173 | zlog_info ("%s ORF route refresh length error", peer->host); | |
2174 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
2175 | return; | |
2176 | } | |
2177 | ||
2178 | when_to_refresh = stream_getc (s); | |
2179 | end = stream_pnt (s) + (size - 5); | |
2180 | ||
370b64a2 | 2181 | while ((stream_pnt (s) + 2) < end) |
718e3744 | 2182 | { |
2183 | orf_type = stream_getc (s); | |
2184 | orf_len = stream_getw (s); | |
370b64a2 PJ |
2185 | |
2186 | /* orf_len in bounds? */ | |
2187 | if ((stream_pnt (s) + orf_len) > end) | |
2188 | break; /* XXX: Notify instead?? */ | |
718e3744 | 2189 | if (orf_type == ORF_TYPE_PREFIX |
2190 | || orf_type == ORF_TYPE_PREFIX_OLD) | |
2191 | { | |
2192 | u_char *p_pnt = stream_pnt (s); | |
2193 | u_char *p_end = stream_pnt (s) + orf_len; | |
2194 | struct orf_prefix orfp; | |
2195 | u_char common = 0; | |
2196 | u_int32_t seq; | |
2197 | int psize; | |
2198 | char name[BUFSIZ]; | |
718e3744 | 2199 | int ret; |
2200 | ||
2201 | if (BGP_DEBUG (normal, NORMAL)) | |
2202 | { | |
6b51474d | 2203 | zlog_debug ("%s rcvd Prefixlist ORF(%d) length %d", |
718e3744 | 2204 | peer->host, orf_type, orf_len); |
2205 | } | |
2206 | ||
370b64a2 PJ |
2207 | /* we're going to read at least 1 byte of common ORF header, |
2208 | * and 7 bytes of ORF Address-filter entry from the stream | |
2209 | */ | |
2210 | if (orf_len < 7) | |
2211 | break; | |
2212 | ||
718e3744 | 2213 | /* ORF prefix-list name */ |
2214 | sprintf (name, "%s.%d.%d", peer->host, afi, safi); | |
2215 | ||
2216 | while (p_pnt < p_end) | |
2217 | { | |
d64379e8 CH |
2218 | /* If the ORF entry is malformed, want to read as much of it |
2219 | * as possible without going beyond the bounds of the entry, | |
2220 | * to maximise debug information. | |
2221 | */ | |
fdbc8e77 | 2222 | int ok; |
718e3744 | 2223 | memset (&orfp, 0, sizeof (struct orf_prefix)); |
2224 | common = *p_pnt++; | |
d64379e8 | 2225 | /* after ++: p_pnt <= p_end */ |
718e3744 | 2226 | if (common & ORF_COMMON_PART_REMOVE_ALL) |
2227 | { | |
2228 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2229 | zlog_debug ("%s rcvd Remove-All pfxlist ORF request", peer->host); |
718e3744 | 2230 | prefix_bgp_orf_remove_all (name); |
2231 | break; | |
2232 | } | |
d64379e8 | 2233 | ok = ((p_end - p_pnt) >= sizeof(u_int32_t)) ; |
bb915f5f | 2234 | if (ok) |
d64379e8 | 2235 | { |
fdbc8e77 PJ |
2236 | memcpy (&seq, p_pnt, sizeof (u_int32_t)); |
2237 | p_pnt += sizeof (u_int32_t); | |
2238 | orfp.seq = ntohl (seq); | |
d64379e8 CH |
2239 | } |
2240 | else | |
2241 | p_pnt = p_end ; | |
2242 | ||
2243 | if ((ok = (p_pnt < p_end))) | |
2244 | orfp.ge = *p_pnt++ ; /* value checked in prefix_bgp_orf_set() */ | |
2245 | if ((ok = (p_pnt < p_end))) | |
2246 | orfp.le = *p_pnt++ ; /* value checked in prefix_bgp_orf_set() */ | |
2247 | if ((ok = (p_pnt < p_end))) | |
2248 | orfp.p.prefixlen = *p_pnt++ ; | |
2249 | orfp.p.family = afi2family (afi); /* afi checked already */ | |
2250 | ||
2251 | psize = PSIZE (orfp.p.prefixlen); /* 0 if not ok */ | |
2252 | if (psize > prefix_blen(&orfp.p)) /* valid for family ? */ | |
2253 | { | |
2254 | ok = 0 ; | |
2255 | psize = prefix_blen(&orfp.p) ; | |
2256 | } | |
2257 | if (psize > (p_end - p_pnt)) /* valid for packet ? */ | |
2258 | { | |
2259 | ok = 0 ; | |
2260 | psize = p_end - p_pnt ; | |
2261 | } | |
2262 | ||
2263 | if (psize > 0) | |
2264 | memcpy (&orfp.p.u.prefix, p_pnt, psize); | |
718e3744 | 2265 | p_pnt += psize; |
2266 | ||
2267 | if (BGP_DEBUG (normal, NORMAL)) | |
14542f3e JBD |
2268 | { |
2269 | char buf[INET6_BUFSIZ]; | |
2270 | ||
2271 | zlog_debug ("%s rcvd %s %s seq %u %s/%d ge %d le %d%s", | |
2272 | peer->host, | |
2273 | (common & ORF_COMMON_PART_REMOVE ? "Remove" : "Add"), | |
2274 | (common & ORF_COMMON_PART_DENY ? "deny" : "permit"), | |
2275 | orfp.seq, | |
2276 | inet_ntop (orfp.p.family, &orfp.p.u.prefix, buf, INET6_BUFSIZ), | |
2277 | orfp.p.prefixlen, orfp.ge, orfp.le, | |
2278 | ok ? "" : " MALFORMED"); | |
2279 | } | |
2280 | ||
d64379e8 | 2281 | if (ok) |
fdbc8e77 PJ |
2282 | ret = prefix_bgp_orf_set (name, afi, &orfp, |
2283 | (common & ORF_COMMON_PART_DENY ? 0 : 1 ), | |
2284 | (common & ORF_COMMON_PART_REMOVE ? 0 : 1)); | |
718e3744 | 2285 | |
d64379e8 | 2286 | if (!ok || (ret != CMD_SUCCESS)) |
718e3744 | 2287 | { |
2288 | if (BGP_DEBUG (normal, NORMAL)) | |
fdbc8e77 PJ |
2289 | zlog_debug ("%s Received misformatted prefixlist ORF." |
2290 | " Remove All pfxlist", peer->host); | |
718e3744 | 2291 | prefix_bgp_orf_remove_all (name); |
2292 | break; | |
2293 | } | |
2294 | } | |
2295 | peer->orf_plist[afi][safi] = | |
2296 | prefix_list_lookup (AFI_ORF_PREFIX, name); | |
2297 | } | |
9985f83c | 2298 | stream_forward_getp (s, orf_len); |
718e3744 | 2299 | } |
2300 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2301 | zlog_debug ("%s rcvd Refresh %s ORF request", peer->host, |
718e3744 | 2302 | when_to_refresh == REFRESH_DEFER ? "Defer" : "Immediate"); |
2303 | if (when_to_refresh == REFRESH_DEFER) | |
2304 | return; | |
2305 | } | |
2306 | ||
2307 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
2308 | if (CHECK_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH)) | |
2309 | UNSET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
2310 | ||
2311 | /* Perform route refreshment to the peer */ | |
2312 | bgp_announce_route (peer, afi, safi); | |
2313 | } | |
2314 | ||
94f2b392 | 2315 | static int |
718e3744 | 2316 | bgp_capability_msg_parse (struct peer *peer, u_char *pnt, bgp_size_t length) |
2317 | { | |
2318 | u_char *end; | |
6d58272b PJ |
2319 | struct capability_mp_data mpc; |
2320 | struct capability_header *hdr; | |
718e3744 | 2321 | u_char action; |
2322 | struct bgp *bgp; | |
2323 | afi_t afi; | |
2324 | safi_t safi; | |
2325 | ||
2326 | bgp = peer->bgp; | |
2327 | end = pnt + length; | |
2328 | ||
2329 | while (pnt < end) | |
6d58272b | 2330 | { |
718e3744 | 2331 | /* We need at least action, capability code and capability length. */ |
2332 | if (pnt + 3 > end) | |
2333 | { | |
2334 | zlog_info ("%s Capability length error", peer->host); | |
2335 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
2336 | return -1; | |
2337 | } | |
718e3744 | 2338 | action = *pnt; |
6d58272b PJ |
2339 | hdr = (struct capability_header *)(pnt + 1); |
2340 | ||
718e3744 | 2341 | /* Action value check. */ |
2342 | if (action != CAPABILITY_ACTION_SET | |
2343 | && action != CAPABILITY_ACTION_UNSET) | |
2344 | { | |
2345 | zlog_info ("%s Capability Action Value error %d", | |
2346 | peer->host, action); | |
2347 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
2348 | return -1; | |
2349 | } | |
2350 | ||
2351 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2352 | zlog_debug ("%s CAPABILITY has action: %d, code: %u, length %u", |
6d58272b | 2353 | peer->host, action, hdr->code, hdr->length); |
718e3744 | 2354 | |
2355 | /* Capability length check. */ | |
6d58272b | 2356 | if ((pnt + hdr->length + 3) > end) |
718e3744 | 2357 | { |
2358 | zlog_info ("%s Capability length error", peer->host); | |
2359 | bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0); | |
2360 | return -1; | |
2361 | } | |
2362 | ||
6d58272b PJ |
2363 | /* Fetch structure to the byte stream. */ |
2364 | memcpy (&mpc, pnt + 3, sizeof (struct capability_mp_data)); | |
2365 | ||
718e3744 | 2366 | /* We know MP Capability Code. */ |
6d58272b | 2367 | if (hdr->code == CAPABILITY_CODE_MP) |
718e3744 | 2368 | { |
6d58272b PJ |
2369 | afi = ntohs (mpc.afi); |
2370 | safi = mpc.safi; | |
718e3744 | 2371 | |
2372 | /* Ignore capability when override-capability is set. */ | |
2373 | if (CHECK_FLAG (peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY)) | |
2374 | continue; | |
6d58272b PJ |
2375 | |
2376 | if (!bgp_afi_safi_valid_indices (afi, &safi)) | |
2377 | { | |
2378 | if (BGP_DEBUG (normal, NORMAL)) | |
0b2aa3a0 PJ |
2379 | zlog_debug ("%s Dynamic Capability MP_EXT afi/safi invalid " |
2380 | "(%u/%u)", peer->host, afi, safi); | |
6d58272b PJ |
2381 | continue; |
2382 | } | |
2383 | ||
718e3744 | 2384 | /* Address family check. */ |
6d58272b PJ |
2385 | if (BGP_DEBUG (normal, NORMAL)) |
2386 | zlog_debug ("%s CAPABILITY has %s MP_EXT CAP for afi/safi: %u/%u", | |
2387 | peer->host, | |
2388 | action == CAPABILITY_ACTION_SET | |
2389 | ? "Advertising" : "Removing", | |
2390 | ntohs(mpc.afi) , mpc.safi); | |
2391 | ||
2392 | if (action == CAPABILITY_ACTION_SET) | |
2393 | { | |
2394 | peer->afc_recv[afi][safi] = 1; | |
2395 | if (peer->afc[afi][safi]) | |
2396 | { | |
2397 | peer->afc_nego[afi][safi] = 1; | |
2398 | bgp_announce_route (peer, afi, safi); | |
2399 | } | |
2400 | } | |
2401 | else | |
2402 | { | |
2403 | peer->afc_recv[afi][safi] = 0; | |
2404 | peer->afc_nego[afi][safi] = 0; | |
2405 | ||
2406 | if (peer_active_nego (peer)) | |
228da428 | 2407 | bgp_clear_route (peer, afi, safi, BGP_CLEAR_ROUTE_NORMAL); |
6d58272b PJ |
2408 | else |
2409 | BGP_EVENT_ADD (peer, BGP_Stop); | |
2410 | } | |
718e3744 | 2411 | } |
718e3744 | 2412 | else |
2413 | { | |
2414 | zlog_warn ("%s unrecognized capability code: %d - ignored", | |
6d58272b | 2415 | peer->host, hdr->code); |
718e3744 | 2416 | } |
6d58272b | 2417 | pnt += hdr->length + 3; |
718e3744 | 2418 | } |
2419 | return 0; | |
2420 | } | |
2421 | ||
01b7ce2d PJ |
2422 | /* Dynamic Capability is received. |
2423 | * | |
2424 | * This is exported for unit-test purposes | |
2425 | */ | |
6d58272b | 2426 | int |
718e3744 | 2427 | bgp_capability_receive (struct peer *peer, bgp_size_t size) |
2428 | { | |
2429 | u_char *pnt; | |
718e3744 | 2430 | |
2431 | /* Fetch pointer. */ | |
2432 | pnt = stream_pnt (peer->ibuf); | |
2433 | ||
2434 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2435 | zlog_debug ("%s rcv CAPABILITY", peer->host); |
718e3744 | 2436 | |
2437 | /* If peer does not have the capability, send notification. */ | |
2438 | if (! CHECK_FLAG (peer->cap, PEER_CAP_DYNAMIC_ADV)) | |
2439 | { | |
2440 | plog_err (peer->log, "%s [Error] BGP dynamic capability is not enabled", | |
2441 | peer->host); | |
2442 | bgp_notify_send (peer, | |
2443 | BGP_NOTIFY_HEADER_ERR, | |
2444 | BGP_NOTIFY_HEADER_BAD_MESTYPE); | |
0b2aa3a0 | 2445 | return -1; |
718e3744 | 2446 | } |
2447 | ||
2448 | /* Status must be Established. */ | |
2449 | if (peer->status != Established) | |
2450 | { | |
2451 | plog_err (peer->log, | |
2452 | "%s [Error] Dynamic capability packet received under status %s", peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
2453 | bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0); | |
0b2aa3a0 | 2454 | return -1; |
718e3744 | 2455 | } |
2456 | ||
2457 | /* Parse packet. */ | |
6d58272b | 2458 | return bgp_capability_msg_parse (peer, pnt, size); |
718e3744 | 2459 | } |
6b0655a2 | 2460 | |
718e3744 | 2461 | /* BGP read utility function. */ |
94f2b392 | 2462 | static int |
718e3744 | 2463 | bgp_read_packet (struct peer *peer) |
2464 | { | |
2465 | int nbytes; | |
2466 | int readsize; | |
2467 | ||
9985f83c | 2468 | readsize = peer->packet_size - stream_get_endp (peer->ibuf); |
718e3744 | 2469 | |
2470 | /* If size is zero then return. */ | |
2471 | if (! readsize) | |
2472 | return 0; | |
2473 | ||
2474 | /* Read packet from fd. */ | |
35398589 | 2475 | nbytes = stream_read_try (peer->ibuf, peer->fd, readsize); |
718e3744 | 2476 | |
2477 | /* If read byte is smaller than zero then error occured. */ | |
2478 | if (nbytes < 0) | |
2479 | { | |
35398589 SH |
2480 | /* Transient error should retry */ |
2481 | if (nbytes == -2) | |
718e3744 | 2482 | return -1; |
2483 | ||
2484 | plog_err (peer->log, "%s [Error] bgp_read_packet error: %s", | |
6099b3b5 | 2485 | peer->host, safe_strerror (errno)); |
93406d87 | 2486 | |
2487 | if (peer->status == Established) | |
2488 | { | |
2489 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_MODE)) | |
2490 | { | |
2491 | peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
2492 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
2493 | } | |
2494 | else | |
2495 | peer->last_reset = PEER_DOWN_CLOSE_SESSION; | |
2496 | } | |
2497 | ||
718e3744 | 2498 | BGP_EVENT_ADD (peer, TCP_fatal_error); |
2499 | return -1; | |
2500 | } | |
2501 | ||
2502 | /* When read byte is zero : clear bgp peer and return */ | |
2503 | if (nbytes == 0) | |
2504 | { | |
2505 | if (BGP_DEBUG (events, EVENTS)) | |
6b51474d | 2506 | plog_debug (peer->log, "%s [Event] BGP connection closed fd %d", |
eb821189 | 2507 | peer->host, peer->fd); |
e0701b79 | 2508 | |
2509 | if (peer->status == Established) | |
93406d87 | 2510 | { |
2511 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_MODE)) | |
2512 | { | |
2513 | peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
2514 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
2515 | } | |
2516 | else | |
2517 | peer->last_reset = PEER_DOWN_CLOSE_SESSION; | |
2518 | } | |
e0701b79 | 2519 | |
718e3744 | 2520 | BGP_EVENT_ADD (peer, TCP_connection_closed); |
2521 | return -1; | |
2522 | } | |
2523 | ||
2524 | /* We read partial packet. */ | |
9985f83c | 2525 | if (stream_get_endp (peer->ibuf) != peer->packet_size) |
718e3744 | 2526 | return -1; |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | /* Marker check. */ | |
94f2b392 | 2532 | static int |
718e3744 | 2533 | bgp_marker_all_one (struct stream *s, int length) |
2534 | { | |
2535 | int i; | |
2536 | ||
2537 | for (i = 0; i < length; i++) | |
2538 | if (s->data[i] != 0xff) | |
2539 | return 0; | |
2540 | ||
2541 | return 1; | |
2542 | } | |
2543 | ||
d61c1bbd SH |
2544 | /* Recent thread time. |
2545 | On same clock base as bgp_clock (MONOTONIC) | |
2546 | but can be time of last context switch to bgp_read thread. */ | |
2547 | static time_t | |
2548 | bgp_recent_clock (void) | |
2549 | { | |
2550 | return recent_relative_time().tv_sec; | |
2551 | } | |
2552 | ||
718e3744 | 2553 | /* Starting point of packet process function. */ |
2554 | int | |
2555 | bgp_read (struct thread *thread) | |
2556 | { | |
2557 | int ret; | |
2558 | u_char type = 0; | |
2559 | struct peer *peer; | |
2560 | bgp_size_t size; | |
2561 | char notify_data_length[2]; | |
d6661008 | 2562 | u_int32_t notify_out; |
718e3744 | 2563 | |
2564 | /* Yes first of all get peer pointer. */ | |
2565 | peer = THREAD_ARG (thread); | |
2566 | peer->t_read = NULL; | |
2567 | ||
d6661008 DS |
2568 | /* Note notify_out so we can check later to see if we sent another one */ |
2569 | notify_out = peer->notify_out; | |
2570 | ||
718e3744 | 2571 | /* For non-blocking IO check. */ |
2572 | if (peer->status == Connect) | |
2573 | { | |
fc9a856f | 2574 | bgp_connect_check (peer, 1); |
718e3744 | 2575 | goto done; |
2576 | } | |
2577 | else | |
2578 | { | |
eb821189 | 2579 | if (peer->fd < 0) |
718e3744 | 2580 | { |
eb821189 | 2581 | zlog_err ("bgp_read peer's fd is negative value %d", peer->fd); |
718e3744 | 2582 | return -1; |
2583 | } | |
eb821189 | 2584 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
718e3744 | 2585 | } |
2586 | ||
2587 | /* Read packet header to determine type of the packet */ | |
2588 | if (peer->packet_size == 0) | |
2589 | peer->packet_size = BGP_HEADER_SIZE; | |
2590 | ||
9985f83c | 2591 | if (stream_get_endp (peer->ibuf) < BGP_HEADER_SIZE) |
718e3744 | 2592 | { |
2593 | ret = bgp_read_packet (peer); | |
2594 | ||
2595 | /* Header read error or partial read packet. */ | |
2596 | if (ret < 0) | |
2597 | goto done; | |
2598 | ||
2599 | /* Get size and type. */ | |
9985f83c | 2600 | stream_forward_getp (peer->ibuf, BGP_MARKER_SIZE); |
718e3744 | 2601 | memcpy (notify_data_length, stream_pnt (peer->ibuf), 2); |
2602 | size = stream_getw (peer->ibuf); | |
2603 | type = stream_getc (peer->ibuf); | |
2604 | ||
2605 | if (BGP_DEBUG (normal, NORMAL) && type != 2 && type != 0) | |
6b51474d | 2606 | zlog_debug ("%s rcv message type %d, length (excl. header) %d", |
718e3744 | 2607 | peer->host, type, size - BGP_HEADER_SIZE); |
2608 | ||
2609 | /* Marker check */ | |
f5ba3874 | 2610 | if (((type == BGP_MSG_OPEN) || (type == BGP_MSG_KEEPALIVE)) |
718e3744 | 2611 | && ! bgp_marker_all_one (peer->ibuf, BGP_MARKER_SIZE)) |
2612 | { | |
2613 | bgp_notify_send (peer, | |
2614 | BGP_NOTIFY_HEADER_ERR, | |
2615 | BGP_NOTIFY_HEADER_NOT_SYNC); | |
2616 | goto done; | |
2617 | } | |
2618 | ||
2619 | /* BGP type check. */ | |
2620 | if (type != BGP_MSG_OPEN && type != BGP_MSG_UPDATE | |
2621 | && type != BGP_MSG_NOTIFY && type != BGP_MSG_KEEPALIVE | |
2622 | && type != BGP_MSG_ROUTE_REFRESH_NEW | |
2623 | && type != BGP_MSG_ROUTE_REFRESH_OLD | |
2624 | && type != BGP_MSG_CAPABILITY) | |
2625 | { | |
2626 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2627 | plog_debug (peer->log, |
718e3744 | 2628 | "%s unknown message type 0x%02x", |
2629 | peer->host, type); | |
2630 | bgp_notify_send_with_data (peer, | |
2631 | BGP_NOTIFY_HEADER_ERR, | |
2632 | BGP_NOTIFY_HEADER_BAD_MESTYPE, | |
2633 | &type, 1); | |
2634 | goto done; | |
2635 | } | |
2636 | /* Mimimum packet length check. */ | |
2637 | if ((size < BGP_HEADER_SIZE) | |
2638 | || (size > BGP_MAX_PACKET_SIZE) | |
2639 | || (type == BGP_MSG_OPEN && size < BGP_MSG_OPEN_MIN_SIZE) | |
2640 | || (type == BGP_MSG_UPDATE && size < BGP_MSG_UPDATE_MIN_SIZE) | |
2641 | || (type == BGP_MSG_NOTIFY && size < BGP_MSG_NOTIFY_MIN_SIZE) | |
2642 | || (type == BGP_MSG_KEEPALIVE && size != BGP_MSG_KEEPALIVE_MIN_SIZE) | |
2643 | || (type == BGP_MSG_ROUTE_REFRESH_NEW && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE) | |
2644 | || (type == BGP_MSG_ROUTE_REFRESH_OLD && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE) | |
2645 | || (type == BGP_MSG_CAPABILITY && size < BGP_MSG_CAPABILITY_MIN_SIZE)) | |
2646 | { | |
2647 | if (BGP_DEBUG (normal, NORMAL)) | |
6b51474d | 2648 | plog_debug (peer->log, |
718e3744 | 2649 | "%s bad message length - %d for %s", |
2650 | peer->host, size, | |
2651 | type == 128 ? "ROUTE-REFRESH" : | |
2652 | bgp_type_str[(int) type]); | |
2653 | bgp_notify_send_with_data (peer, | |
2654 | BGP_NOTIFY_HEADER_ERR, | |
2655 | BGP_NOTIFY_HEADER_BAD_MESLEN, | |
c9e52be3 | 2656 | (u_char *) notify_data_length, 2); |
718e3744 | 2657 | goto done; |
2658 | } | |
2659 | ||
2660 | /* Adjust size to message length. */ | |
2661 | peer->packet_size = size; | |
2662 | } | |
2663 | ||
2664 | ret = bgp_read_packet (peer); | |
2665 | if (ret < 0) | |
2666 | goto done; | |
2667 | ||
2668 | /* Get size and type again. */ | |
2669 | size = stream_getw_from (peer->ibuf, BGP_MARKER_SIZE); | |
2670 | type = stream_getc_from (peer->ibuf, BGP_MARKER_SIZE + 2); | |
2671 | ||
2672 | /* BGP packet dump function. */ | |
2673 | bgp_dump_packet (peer, type, peer->ibuf); | |
2674 | ||
2675 | size = (peer->packet_size - BGP_HEADER_SIZE); | |
2676 | ||
2677 | /* Read rest of the packet and call each sort of packet routine */ | |
2678 | switch (type) | |
2679 | { | |
2680 | case BGP_MSG_OPEN: | |
2681 | peer->open_in++; | |
f5ba3874 | 2682 | bgp_open_receive (peer, size); /* XXX return value ignored! */ |
718e3744 | 2683 | break; |
2684 | case BGP_MSG_UPDATE: | |
d61c1bbd | 2685 | peer->readtime = bgp_recent_clock (); |
718e3744 | 2686 | bgp_update_receive (peer, size); |
2687 | break; | |
2688 | case BGP_MSG_NOTIFY: | |
2689 | bgp_notify_receive (peer, size); | |
2690 | break; | |
2691 | case BGP_MSG_KEEPALIVE: | |
d61c1bbd | 2692 | peer->readtime = bgp_recent_clock (); |
718e3744 | 2693 | bgp_keepalive_receive (peer, size); |
2694 | break; | |
2695 | case BGP_MSG_ROUTE_REFRESH_NEW: | |
2696 | case BGP_MSG_ROUTE_REFRESH_OLD: | |
2697 | peer->refresh_in++; | |
2698 | bgp_route_refresh_receive (peer, size); | |
2699 | break; | |
2700 | case BGP_MSG_CAPABILITY: | |
2701 | peer->dynamic_cap_in++; | |
2702 | bgp_capability_receive (peer, size); | |
2703 | break; | |
2704 | } | |
2705 | ||
d6661008 DS |
2706 | /* If reading this packet caused us to send a NOTIFICATION then store a copy |
2707 | * of the packet for troubleshooting purposes | |
2708 | */ | |
2709 | if (notify_out < peer->notify_out) | |
2710 | { | |
2711 | memcpy(peer->last_reset_cause, peer->ibuf->data, peer->packet_size); | |
2712 | peer->last_reset_cause_size = peer->packet_size; | |
2713 | notify_out = peer->notify_out; | |
2714 | } | |
2715 | ||
718e3744 | 2716 | /* Clear input buffer. */ |
2717 | peer->packet_size = 0; | |
2718 | if (peer->ibuf) | |
2719 | stream_reset (peer->ibuf); | |
2720 | ||
2721 | done: | |
d6661008 DS |
2722 | /* If reading this packet caused us to send a NOTIFICATION then store a copy |
2723 | * of the packet for troubleshooting purposes | |
2724 | */ | |
2725 | if (notify_out < peer->notify_out) | |
2726 | { | |
2727 | memcpy(peer->last_reset_cause, peer->ibuf->data, peer->packet_size); | |
2728 | peer->last_reset_cause_size = peer->packet_size; | |
2729 | } | |
2730 | ||
718e3744 | 2731 | return 0; |
2732 | } |