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718e3744 | 1 | /* BGP attributes management routines. |
2 | Copyright (C) 1996, 97, 98, 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 "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
27 | #include "vty.h" | |
28 | #include "stream.h" | |
29 | #include "log.h" | |
30 | #include "hash.h" | |
31 | ||
32 | #include "bgpd/bgpd.h" | |
33 | #include "bgpd/bgp_attr.h" | |
34 | #include "bgpd/bgp_route.h" | |
35 | #include "bgpd/bgp_aspath.h" | |
36 | #include "bgpd/bgp_community.h" | |
37 | #include "bgpd/bgp_debug.h" | |
38 | #include "bgpd/bgp_packet.h" | |
39 | #include "bgpd/bgp_ecommunity.h" | |
40 | \f | |
41 | /* Attribute strings for logging. */ | |
6e4ab12f | 42 | static struct message attr_str [] = |
718e3744 | 43 | { |
44 | { BGP_ATTR_ORIGIN, "ORIGIN" }, | |
45 | { BGP_ATTR_AS_PATH, "AS_PATH" }, | |
46 | { BGP_ATTR_NEXT_HOP, "NEXT_HOP" }, | |
47 | { BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" }, | |
48 | { BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" }, | |
49 | { BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" }, | |
50 | { BGP_ATTR_AGGREGATOR, "AGGREGATOR" }, | |
51 | { BGP_ATTR_COMMUNITIES, "COMMUNITY" }, | |
52 | { BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" }, | |
53 | { BGP_ATTR_CLUSTER_LIST, "CLUSTERLIST" }, | |
54 | { BGP_ATTR_DPA, "DPA" }, | |
55 | { BGP_ATTR_ADVERTISER, "ADVERTISER"} , | |
56 | { BGP_ATTR_RCID_PATH, "RCID_PATH" }, | |
57 | { BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" }, | |
58 | { BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" }, | |
59 | { 0, NULL } | |
60 | }; | |
6e4ab12f | 61 | int attr_str_max = sizeof(attr_str)/sizeof(attr_str[0]); |
718e3744 | 62 | \f |
63 | struct hash *cluster_hash; | |
64 | ||
94f2b392 | 65 | static void * |
718e3744 | 66 | cluster_hash_alloc (struct cluster_list *val) |
67 | { | |
68 | struct cluster_list *cluster; | |
69 | ||
70 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
71 | cluster->length = val->length; | |
72 | ||
73 | if (cluster->length) | |
74 | { | |
75 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
76 | memcpy (cluster->list, val->list, val->length); | |
77 | } | |
78 | else | |
79 | cluster->list = NULL; | |
80 | ||
81 | cluster->refcnt = 0; | |
82 | ||
83 | return cluster; | |
84 | } | |
85 | ||
86 | /* Cluster list related functions. */ | |
94f2b392 | 87 | static struct cluster_list * |
5228ad27 | 88 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 89 | { |
90 | struct cluster_list tmp; | |
91 | struct cluster_list *cluster; | |
92 | ||
93 | tmp.length = length; | |
5228ad27 | 94 | tmp.list = pnt; |
718e3744 | 95 | |
96 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
97 | cluster->refcnt++; | |
98 | return cluster; | |
99 | } | |
100 | ||
101 | int | |
102 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
103 | { | |
104 | int i; | |
105 | ||
106 | for (i = 0; i < cluster->length / 4; i++) | |
107 | if (cluster->list[i].s_addr == originator.s_addr) | |
108 | return 1; | |
109 | return 0; | |
110 | } | |
111 | ||
94f2b392 | 112 | static unsigned int |
718e3744 | 113 | cluster_hash_key_make (struct cluster_list *cluster) |
114 | { | |
115 | unsigned int key = 0; | |
116 | int length; | |
117 | caddr_t pnt; | |
118 | ||
119 | length = cluster->length; | |
120 | pnt = (caddr_t) cluster->list; | |
121 | ||
122 | while (length) | |
123 | key += pnt[--length]; | |
124 | ||
125 | return key; | |
126 | } | |
127 | ||
94f2b392 | 128 | static int |
718e3744 | 129 | cluster_hash_cmp (struct cluster_list *cluster1, struct cluster_list *cluster2) |
130 | { | |
131 | if (cluster1->length == cluster2->length && | |
132 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0) | |
133 | return 1; | |
134 | return 0; | |
135 | } | |
136 | ||
94f2b392 | 137 | static void |
718e3744 | 138 | cluster_free (struct cluster_list *cluster) |
139 | { | |
140 | if (cluster->list) | |
141 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
142 | XFREE (MTYPE_CLUSTER, cluster); | |
143 | } | |
144 | ||
94f2b392 | 145 | static struct cluster_list * |
718e3744 | 146 | cluster_dup (struct cluster_list *cluster) |
147 | { | |
148 | struct cluster_list *new; | |
149 | ||
150 | new = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
151 | memset (new, 0, sizeof (struct cluster_list)); | |
152 | new->length = cluster->length; | |
153 | ||
154 | if (cluster->length) | |
155 | { | |
156 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
157 | memcpy (new->list, cluster->list, cluster->length); | |
158 | } | |
159 | else | |
160 | new->list = NULL; | |
161 | ||
162 | return new; | |
163 | } | |
164 | ||
94f2b392 | 165 | static struct cluster_list * |
718e3744 | 166 | cluster_intern (struct cluster_list *cluster) |
167 | { | |
168 | struct cluster_list *find; | |
169 | ||
170 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
171 | find->refcnt++; | |
172 | ||
173 | return find; | |
174 | } | |
175 | ||
176 | void | |
177 | cluster_unintern (struct cluster_list *cluster) | |
178 | { | |
179 | struct cluster_list *ret; | |
180 | ||
181 | if (cluster->refcnt) | |
182 | cluster->refcnt--; | |
183 | ||
184 | if (cluster->refcnt == 0) | |
185 | { | |
186 | ret = hash_release (cluster_hash, cluster); | |
187 | cluster_free (cluster); | |
188 | } | |
189 | } | |
190 | ||
94f2b392 | 191 | static void |
192 | cluster_init (void) | |
718e3744 | 193 | { |
194 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp); | |
195 | } | |
196 | \f | |
197 | /* Unknown transit attribute. */ | |
198 | struct hash *transit_hash; | |
199 | ||
94f2b392 | 200 | static void |
718e3744 | 201 | transit_free (struct transit *transit) |
202 | { | |
203 | if (transit->val) | |
204 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
205 | XFREE (MTYPE_TRANSIT, transit); | |
206 | } | |
207 | ||
94f2b392 | 208 | static void * |
718e3744 | 209 | transit_hash_alloc (struct transit *transit) |
210 | { | |
211 | /* Transit structure is already allocated. */ | |
212 | return transit; | |
213 | } | |
214 | ||
94f2b392 | 215 | static struct transit * |
718e3744 | 216 | transit_intern (struct transit *transit) |
217 | { | |
218 | struct transit *find; | |
219 | ||
220 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
221 | if (find != transit) | |
222 | transit_free (transit); | |
223 | find->refcnt++; | |
224 | ||
225 | return find; | |
226 | } | |
227 | ||
228 | void | |
229 | transit_unintern (struct transit *transit) | |
230 | { | |
231 | struct transit *ret; | |
232 | ||
233 | if (transit->refcnt) | |
234 | transit->refcnt--; | |
235 | ||
236 | if (transit->refcnt == 0) | |
237 | { | |
238 | ret = hash_release (transit_hash, transit); | |
239 | transit_free (transit); | |
240 | } | |
241 | } | |
242 | ||
94f2b392 | 243 | static unsigned int |
718e3744 | 244 | transit_hash_key_make (struct transit *transit) |
245 | { | |
246 | unsigned int key = 0; | |
247 | int length; | |
248 | caddr_t pnt; | |
249 | ||
250 | length = transit->length; | |
251 | pnt = (caddr_t) transit->val; | |
252 | ||
253 | while (length) | |
254 | key += pnt[--length]; | |
255 | ||
256 | return key; | |
257 | } | |
258 | ||
94f2b392 | 259 | static int |
718e3744 | 260 | transit_hash_cmp (struct transit *transit1, struct transit *transit2) |
261 | { | |
262 | if (transit1->length == transit2->length && | |
263 | memcmp (transit1->val, transit2->val, transit1->length) == 0) | |
264 | return 1; | |
265 | return 0; | |
266 | } | |
267 | ||
94f2b392 | 268 | static void |
718e3744 | 269 | transit_init () |
270 | { | |
271 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp); | |
272 | } | |
273 | \f | |
274 | /* Attribute hash routines. */ | |
275 | ||
276 | struct hash *attrhash; | |
277 | ||
cbdfbaa5 PJ |
278 | unsigned long int |
279 | attr_count (void) | |
280 | { | |
281 | return attrhash->count; | |
282 | } | |
283 | ||
284 | unsigned long int | |
285 | attr_unknown_count (void) | |
286 | { | |
287 | return transit_hash->count; | |
288 | } | |
289 | ||
718e3744 | 290 | unsigned int |
291 | attrhash_key_make (struct attr *attr) | |
292 | { | |
293 | unsigned int key = 0; | |
294 | ||
295 | key += attr->origin; | |
296 | key += attr->nexthop.s_addr; | |
297 | key += attr->med; | |
298 | key += attr->local_pref; | |
299 | key += attr->aggregator_as; | |
300 | key += attr->aggregator_addr.s_addr; | |
301 | key += attr->weight; | |
302 | ||
303 | key += attr->mp_nexthop_global_in.s_addr; | |
304 | if (attr->aspath) | |
305 | key += aspath_key_make (attr->aspath); | |
306 | if (attr->community) | |
307 | key += community_hash_make (attr->community); | |
308 | if (attr->ecommunity) | |
309 | key += ecommunity_hash_make (attr->ecommunity); | |
310 | if (attr->cluster) | |
311 | key += cluster_hash_key_make (attr->cluster); | |
312 | if (attr->transit) | |
313 | key += transit_hash_key_make (attr->transit); | |
314 | ||
315 | #ifdef HAVE_IPV6 | |
316 | { | |
317 | int i; | |
318 | ||
319 | key += attr->mp_nexthop_len; | |
320 | for (i = 0; i < 16; i++) | |
321 | key += attr->mp_nexthop_global.s6_addr[i]; | |
322 | for (i = 0; i < 16; i++) | |
323 | key += attr->mp_nexthop_local.s6_addr[i]; | |
324 | } | |
325 | #endif /* HAVE_IPV6 */ | |
326 | ||
327 | return key; | |
328 | } | |
329 | ||
330 | int | |
331 | attrhash_cmp (struct attr *attr1, struct attr *attr2) | |
332 | { | |
333 | if (attr1->flag == attr2->flag | |
334 | && attr1->origin == attr2->origin | |
335 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
336 | && attr1->med == attr2->med | |
337 | && attr1->local_pref == attr2->local_pref | |
338 | && attr1->aggregator_as == attr2->aggregator_as | |
339 | && attr1->aggregator_addr.s_addr == attr2->aggregator_addr.s_addr | |
340 | && attr1->weight == attr2->weight | |
341 | #ifdef HAVE_IPV6 | |
342 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
343 | && IPV6_ADDR_SAME (&attr1->mp_nexthop_global, &attr2->mp_nexthop_global) | |
344 | && IPV6_ADDR_SAME (&attr1->mp_nexthop_local, &attr2->mp_nexthop_local) | |
345 | #endif /* HAVE_IPV6 */ | |
346 | && IPV4_ADDR_SAME (&attr1->mp_nexthop_global_in, &attr2->mp_nexthop_global_in) | |
347 | && attr1->aspath == attr2->aspath | |
348 | && attr1->community == attr2->community | |
349 | && attr1->ecommunity == attr2->ecommunity | |
350 | && attr1->cluster == attr2->cluster | |
351 | && attr1->transit == attr2->transit) | |
352 | return 1; | |
353 | else | |
354 | return 0; | |
355 | } | |
356 | ||
94f2b392 | 357 | static void |
718e3744 | 358 | attrhash_init () |
359 | { | |
360 | attrhash = hash_create (attrhash_key_make, attrhash_cmp); | |
361 | } | |
362 | ||
94f2b392 | 363 | static void |
718e3744 | 364 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
365 | { | |
366 | struct attr *attr = backet->data; | |
367 | ||
368 | vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt, | |
369 | inet_ntoa (attr->nexthop), VTY_NEWLINE); | |
370 | } | |
371 | ||
372 | void | |
373 | attr_show_all (struct vty *vty) | |
374 | { | |
375 | hash_iterate (attrhash, | |
376 | (void (*)(struct hash_backet *, void *)) | |
377 | attr_show_all_iterator, | |
378 | vty); | |
379 | } | |
380 | ||
94f2b392 | 381 | static void * |
718e3744 | 382 | bgp_attr_hash_alloc (struct attr *val) |
383 | { | |
384 | struct attr *attr; | |
385 | ||
386 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
387 | *attr = *val; | |
388 | attr->refcnt = 0; | |
389 | return attr; | |
390 | } | |
391 | ||
392 | /* Internet argument attribute. */ | |
393 | struct attr * | |
394 | bgp_attr_intern (struct attr *attr) | |
395 | { | |
396 | struct attr *find; | |
397 | ||
398 | /* Intern referenced strucutre. */ | |
399 | if (attr->aspath) | |
400 | { | |
401 | if (! attr->aspath->refcnt) | |
402 | attr->aspath = aspath_intern (attr->aspath); | |
403 | else | |
404 | attr->aspath->refcnt++; | |
405 | } | |
406 | if (attr->community) | |
407 | { | |
408 | if (! attr->community->refcnt) | |
409 | attr->community = community_intern (attr->community); | |
410 | else | |
411 | attr->community->refcnt++; | |
412 | } | |
413 | if (attr->ecommunity) | |
414 | { | |
415 | if (! attr->ecommunity->refcnt) | |
416 | attr->ecommunity = ecommunity_intern (attr->ecommunity); | |
417 | else | |
418 | attr->ecommunity->refcnt++; | |
419 | } | |
420 | if (attr->cluster) | |
421 | { | |
422 | if (! attr->cluster->refcnt) | |
423 | attr->cluster = cluster_intern (attr->cluster); | |
424 | else | |
425 | attr->cluster->refcnt++; | |
426 | } | |
427 | if (attr->transit) | |
428 | { | |
429 | if (! attr->transit->refcnt) | |
430 | attr->transit = transit_intern (attr->transit); | |
431 | else | |
432 | attr->transit->refcnt++; | |
433 | } | |
434 | ||
435 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); | |
436 | find->refcnt++; | |
437 | ||
438 | return find; | |
439 | } | |
440 | ||
441 | /* Make network statement's attribute. */ | |
442 | struct attr * | |
443 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
444 | { | |
445 | memset (attr, 0, sizeof (struct attr)); | |
446 | ||
447 | attr->origin = origin; | |
448 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
449 | attr->aspath = aspath_empty (); | |
450 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
451 | attr->weight = 32768; | |
452 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
453 | #ifdef HAVE_IPV6 | |
454 | attr->mp_nexthop_len = 16; | |
455 | #endif | |
456 | return attr; | |
457 | } | |
458 | ||
459 | /* Make network statement's attribute. */ | |
460 | struct attr * | |
461 | bgp_attr_default_intern (u_char origin) | |
462 | { | |
463 | struct attr attr; | |
464 | struct attr *new; | |
465 | ||
466 | memset (&attr, 0, sizeof (struct attr)); | |
467 | ||
468 | attr.origin = origin; | |
469 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
470 | attr.aspath = aspath_empty (); | |
471 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
472 | attr.weight = 32768; | |
473 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
474 | #ifdef HAVE_IPV6 | |
475 | attr.mp_nexthop_len = 16; | |
476 | #endif | |
477 | ||
478 | new = bgp_attr_intern (&attr); | |
479 | aspath_unintern (new->aspath); | |
480 | return new; | |
481 | } | |
482 | ||
483 | struct attr * | |
484 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
485 | struct aspath *aspath, | |
486 | struct community *community, int as_set) | |
487 | { | |
488 | struct attr attr; | |
489 | struct attr *new; | |
490 | ||
491 | memset (&attr, 0, sizeof (struct attr)); | |
492 | ||
493 | /* Origin attribute. */ | |
494 | attr.origin = origin; | |
495 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
496 | ||
497 | /* AS path attribute. */ | |
498 | if (aspath) | |
499 | attr.aspath = aspath_intern (aspath); | |
500 | else | |
501 | attr.aspath = aspath_empty (); | |
502 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
503 | ||
504 | /* Next hop attribute. */ | |
505 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
506 | ||
507 | if (community) | |
508 | { | |
509 | attr.community = community; | |
510 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
511 | } | |
512 | ||
513 | attr.weight = 32768; | |
514 | #ifdef HAVE_IPV6 | |
515 | attr.mp_nexthop_len = 16; | |
516 | #endif | |
517 | if (! as_set) | |
518 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
519 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
520 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
521 | attr.aggregator_as = bgp->confed_id; | |
522 | else | |
523 | attr.aggregator_as = bgp->as; | |
524 | attr.aggregator_addr = bgp->router_id; | |
525 | ||
526 | new = bgp_attr_intern (&attr); | |
527 | aspath_unintern (new->aspath); | |
528 | return new; | |
529 | } | |
530 | ||
531 | /* Free bgp attribute and aspath. */ | |
532 | void | |
533 | bgp_attr_unintern (struct attr *attr) | |
534 | { | |
535 | struct attr *ret; | |
536 | struct aspath *aspath; | |
537 | struct community *community; | |
538 | struct ecommunity *ecommunity; | |
539 | struct cluster_list *cluster; | |
540 | struct transit *transit; | |
541 | ||
542 | /* Decrement attribute reference. */ | |
543 | attr->refcnt--; | |
544 | aspath = attr->aspath; | |
545 | community = attr->community; | |
546 | ecommunity = attr->ecommunity; | |
547 | cluster = attr->cluster; | |
548 | transit = attr->transit; | |
549 | ||
550 | /* If reference becomes zero then free attribute object. */ | |
551 | if (attr->refcnt == 0) | |
552 | { | |
553 | ret = hash_release (attrhash, attr); | |
554 | assert (ret != NULL); | |
555 | XFREE (MTYPE_ATTR, attr); | |
556 | } | |
557 | ||
558 | /* aspath refcount shoud be decrement. */ | |
559 | if (aspath) | |
560 | aspath_unintern (aspath); | |
561 | if (community) | |
562 | community_unintern (community); | |
563 | if (ecommunity) | |
564 | ecommunity_unintern (ecommunity); | |
565 | if (cluster) | |
566 | cluster_unintern (cluster); | |
567 | if (transit) | |
568 | transit_unintern (transit); | |
569 | } | |
570 | ||
571 | void | |
572 | bgp_attr_flush (struct attr *attr) | |
573 | { | |
574 | if (attr->aspath && ! attr->aspath->refcnt) | |
575 | aspath_free (attr->aspath); | |
576 | if (attr->community && ! attr->community->refcnt) | |
577 | community_free (attr->community); | |
578 | if (attr->ecommunity && ! attr->ecommunity->refcnt) | |
579 | ecommunity_free (attr->ecommunity); | |
580 | if (attr->cluster && ! attr->cluster->refcnt) | |
581 | cluster_free (attr->cluster); | |
582 | if (attr->transit && ! attr->transit->refcnt) | |
583 | transit_free (attr->transit); | |
584 | } | |
585 | ||
586 | /* Get origin attribute of the update message. */ | |
94f2b392 | 587 | static int |
718e3744 | 588 | bgp_attr_origin (struct peer *peer, bgp_size_t length, |
589 | struct attr *attr, u_char flag, u_char *startp) | |
590 | { | |
591 | bgp_size_t total; | |
592 | ||
593 | /* total is entire attribute length include Attribute Flags (1), | |
594 | Attribute Type code (1) and Attribute length (1 or 2). */ | |
595 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
596 | ||
597 | /* If any recognized attribute has Attribute Flags that conflict | |
598 | with the Attribute Type Code, then the Error Subcode is set to | |
599 | Attribute Flags Error. The Data field contains the erroneous | |
600 | attribute (type, length and value). */ | |
601 | if (flag != BGP_ATTR_FLAG_TRANS) | |
602 | { | |
603 | zlog (peer->log, LOG_ERR, | |
604 | "Origin attribute flag isn't transitive %d", flag); | |
605 | bgp_notify_send_with_data (peer, | |
606 | BGP_NOTIFY_UPDATE_ERR, | |
607 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
608 | startp, total); | |
609 | return -1; | |
610 | } | |
611 | ||
612 | /* If any recognized attribute has Attribute Length that conflicts | |
613 | with the expected length (based on the attribute type code), then | |
614 | the Error Subcode is set to Attribute Length Error. The Data | |
615 | field contains the erroneous attribute (type, length and | |
616 | value). */ | |
617 | if (length != 1) | |
618 | { | |
619 | zlog (peer->log, LOG_ERR, "Origin attribute length is not one %d", | |
620 | length); | |
621 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, | |
622 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
623 | startp, total); | |
624 | return -1; | |
625 | } | |
626 | ||
627 | /* Fetch origin attribute. */ | |
628 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
629 | ||
630 | /* If the ORIGIN attribute has an undefined value, then the Error | |
631 | Subcode is set to Invalid Origin Attribute. The Data field | |
632 | contains the unrecognized attribute (type, length and value). */ | |
633 | if ((attr->origin != BGP_ORIGIN_IGP) | |
634 | && (attr->origin != BGP_ORIGIN_EGP) | |
635 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
636 | { | |
637 | zlog (peer->log, LOG_ERR, "Origin attribute value is invalid %d", | |
638 | attr->origin); | |
639 | ||
640 | bgp_notify_send_with_data (peer, | |
641 | BGP_NOTIFY_UPDATE_ERR, | |
642 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
643 | startp, total); | |
644 | return -1; | |
645 | } | |
646 | ||
647 | /* Set oring attribute flag. */ | |
648 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | /* Parse AS path information. This function is wrapper of | |
654 | aspath_parse. */ | |
94f2b392 | 655 | static int |
718e3744 | 656 | bgp_attr_aspath (struct peer *peer, bgp_size_t length, |
657 | struct attr *attr, u_char flag, u_char *startp) | |
658 | { | |
659 | struct bgp *bgp; | |
660 | struct aspath *aspath; | |
661 | bgp_size_t total; | |
662 | ||
663 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
664 | ||
665 | /* Flag check. */ | |
666 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
667 | || ! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
668 | { | |
669 | zlog (peer->log, LOG_ERR, | |
670 | "Origin attribute flag isn't transitive %d", flag); | |
671 | bgp_notify_send_with_data (peer, | |
672 | BGP_NOTIFY_UPDATE_ERR, | |
673 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
674 | startp, total); | |
675 | return -1; | |
676 | } | |
677 | ||
678 | /* In case of IBGP, length will be zero. */ | |
fe69a505 | 679 | attr->aspath = aspath_parse (peer->ibuf, length); |
718e3744 | 680 | if (! attr->aspath) |
681 | { | |
682 | zlog (peer->log, LOG_ERR, "Malformed AS path length is %d", length); | |
683 | bgp_notify_send (peer, | |
684 | BGP_NOTIFY_UPDATE_ERR, | |
685 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
686 | return -1; | |
687 | } | |
688 | ||
689 | bgp = peer->bgp; | |
690 | ||
691 | /* First AS check for EBGP. */ | |
692 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
693 | { | |
694 | if (peer_sort (peer) == BGP_PEER_EBGP | |
695 | && ! aspath_firstas_check (attr->aspath, peer->as)) | |
696 | { | |
697 | zlog (peer->log, LOG_ERR, | |
698 | "%s incorrect first AS (must be %d)", peer->host, peer->as); | |
699 | bgp_notify_send (peer, | |
700 | BGP_NOTIFY_UPDATE_ERR, | |
701 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
702 | return -1; | |
703 | } | |
704 | } | |
705 | ||
706 | /* local-as prepend */ | |
707 | if (peer->change_local_as && | |
708 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
709 | { | |
710 | aspath = aspath_dup (attr->aspath); | |
711 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
712 | aspath_unintern (attr->aspath); | |
713 | attr->aspath = aspath_intern (aspath); | |
714 | } | |
715 | ||
716 | /* Forward pointer. */ | |
fe69a505 | 717 | /* stream_forward_getp (peer->ibuf, length);*/ |
718e3744 | 718 | |
719 | /* Set aspath attribute flag. */ | |
720 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
725 | /* Nexthop attribute. */ | |
94f2b392 | 726 | static int |
718e3744 | 727 | bgp_attr_nexthop (struct peer *peer, bgp_size_t length, |
728 | struct attr *attr, u_char flag, u_char *startp) | |
729 | { | |
730 | bgp_size_t total; | |
731 | ||
732 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
733 | ||
734 | /* Flag check. */ | |
735 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
736 | || ! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
737 | { | |
738 | zlog (peer->log, LOG_ERR, | |
739 | "Origin attribute flag isn't transitive %d", flag); | |
740 | bgp_notify_send_with_data (peer, | |
741 | BGP_NOTIFY_UPDATE_ERR, | |
742 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
743 | startp, total); | |
744 | return -1; | |
745 | } | |
746 | ||
747 | /* Check nexthop attribute length. */ | |
748 | if (length != 4) | |
749 | { | |
750 | zlog (peer->log, LOG_ERR, "Nexthop attribute length isn't four [%d]", | |
751 | length); | |
752 | ||
753 | bgp_notify_send_with_data (peer, | |
754 | BGP_NOTIFY_UPDATE_ERR, | |
755 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
756 | startp, total); | |
757 | return -1; | |
758 | } | |
759 | ||
760 | attr->nexthop.s_addr = stream_get_ipv4 (peer->ibuf); | |
761 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | /* MED atrribute. */ | |
94f2b392 | 767 | static int |
718e3744 | 768 | bgp_attr_med (struct peer *peer, bgp_size_t length, |
769 | struct attr *attr, u_char flag, u_char *startp) | |
770 | { | |
771 | bgp_size_t total; | |
772 | ||
773 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
774 | ||
775 | /* Length check. */ | |
776 | if (length != 4) | |
777 | { | |
778 | zlog (peer->log, LOG_ERR, | |
779 | "MED attribute length isn't four [%d]", length); | |
780 | ||
781 | bgp_notify_send_with_data (peer, | |
782 | BGP_NOTIFY_UPDATE_ERR, | |
783 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
784 | startp, total); | |
785 | return -1; | |
786 | } | |
787 | ||
788 | attr->med = stream_getl (peer->ibuf); | |
789 | ||
790 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | /* Local preference attribute. */ | |
94f2b392 | 796 | static int |
718e3744 | 797 | bgp_attr_local_pref (struct peer *peer, bgp_size_t length, |
798 | struct attr *attr, u_char flag) | |
799 | { | |
800 | /* If it is contained in an UPDATE message that is received from an | |
801 | external peer, then this attribute MUST be ignored by the | |
802 | receiving speaker. */ | |
803 | if (peer_sort (peer) == BGP_PEER_EBGP) | |
804 | { | |
9985f83c | 805 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 806 | return 0; |
807 | } | |
808 | ||
809 | if (length == 4) | |
810 | attr->local_pref = stream_getl (peer->ibuf); | |
811 | else | |
812 | attr->local_pref = 0; | |
813 | ||
814 | /* Set atomic aggregate flag. */ | |
815 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
820 | /* Atomic aggregate. */ | |
94f2b392 | 821 | static int |
718e3744 | 822 | bgp_attr_atomic (struct peer *peer, bgp_size_t length, |
823 | struct attr *attr, u_char flag) | |
824 | { | |
825 | if (length != 0) | |
826 | { | |
827 | zlog (peer->log, LOG_ERR, "Bad atomic aggregate length %d", length); | |
828 | ||
829 | bgp_notify_send (peer, | |
830 | BGP_NOTIFY_UPDATE_ERR, | |
831 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
832 | return -1; | |
833 | } | |
834 | ||
835 | /* Set atomic aggregate flag. */ | |
836 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | /* Aggregator attribute */ | |
94f2b392 | 842 | static int |
718e3744 | 843 | bgp_attr_aggregator (struct peer *peer, bgp_size_t length, |
844 | struct attr *attr, u_char flag) | |
845 | { | |
846 | if (length != 6) | |
847 | { | |
848 | zlog (peer->log, LOG_ERR, "Aggregator length is not 6 [%d]", length); | |
849 | ||
850 | bgp_notify_send (peer, | |
851 | BGP_NOTIFY_UPDATE_ERR, | |
852 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
853 | return -1; | |
854 | } | |
855 | attr->aggregator_as = stream_getw (peer->ibuf); | |
856 | attr->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); | |
857 | ||
858 | /* Set atomic aggregate flag. */ | |
859 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | /* Community attribute. */ | |
94f2b392 | 865 | static int |
718e3744 | 866 | bgp_attr_community (struct peer *peer, bgp_size_t length, |
867 | struct attr *attr, u_char flag) | |
868 | { | |
869 | if (length == 0) | |
870 | attr->community = NULL; | |
871 | else | |
872 | { | |
5228ad27 | 873 | attr->community = |
874 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
9985f83c | 875 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 876 | } |
877 | ||
878 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
883 | /* Originator ID attribute. */ | |
94f2b392 | 884 | static int |
718e3744 | 885 | bgp_attr_originator_id (struct peer *peer, bgp_size_t length, |
886 | struct attr *attr, u_char flag) | |
887 | { | |
888 | if (length != 4) | |
889 | { | |
890 | zlog (peer->log, LOG_ERR, "Bad originator ID length %d", length); | |
891 | ||
892 | bgp_notify_send (peer, | |
893 | BGP_NOTIFY_UPDATE_ERR, | |
894 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
895 | return -1; | |
896 | } | |
897 | ||
898 | attr->originator_id.s_addr = stream_get_ipv4 (peer->ibuf); | |
899 | ||
900 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | /* Cluster list attribute. */ | |
94f2b392 | 906 | static int |
718e3744 | 907 | bgp_attr_cluster_list (struct peer *peer, bgp_size_t length, |
908 | struct attr *attr, u_char flag) | |
909 | { | |
910 | /* Check length. */ | |
911 | if (length % 4) | |
912 | { | |
913 | zlog (peer->log, LOG_ERR, "Bad cluster list length %d", length); | |
914 | ||
915 | bgp_notify_send (peer, | |
916 | BGP_NOTIFY_UPDATE_ERR, | |
917 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
918 | return -1; | |
919 | } | |
920 | ||
5228ad27 | 921 | attr->cluster = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), |
922 | length); | |
718e3744 | 923 | |
9985f83c | 924 | stream_forward_getp (peer->ibuf, length);; |
718e3744 | 925 | |
926 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | /* Multiprotocol reachability information parse. */ | |
94f2b392 | 932 | static int |
718e3744 | 933 | bgp_mp_reach_parse (struct peer *peer, bgp_size_t length, struct attr *attr, |
934 | struct bgp_nlri *mp_update) | |
935 | { | |
936 | u_int16_t afi; | |
937 | u_char safi; | |
718e3744 | 938 | bgp_size_t nlri_len; |
6e4ab12f | 939 | size_t start; |
718e3744 | 940 | int ret; |
941 | struct stream *s; | |
942 | ||
943 | /* Set end of packet. */ | |
6e4ab12f PJ |
944 | s = BGP_INPUT(peer); |
945 | start = stream_get_getp(s); | |
946 | ||
947 | /* safe to read statically sized header? */ | |
948 | #define BGP_MP_REACH_MIN_SIZE 5 | |
949 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) | |
950 | return -1; | |
951 | ||
718e3744 | 952 | /* Load AFI, SAFI. */ |
953 | afi = stream_getw (s); | |
954 | safi = stream_getc (s); | |
955 | ||
956 | /* Get nexthop length. */ | |
957 | attr->mp_nexthop_len = stream_getc (s); | |
6e4ab12f PJ |
958 | |
959 | if (STREAM_READABLE(s) < attr->mp_nexthop_len) | |
960 | return -1; | |
961 | ||
718e3744 | 962 | /* Nexthop length check. */ |
963 | switch (attr->mp_nexthop_len) | |
964 | { | |
965 | case 4: | |
966 | stream_get (&attr->mp_nexthop_global_in, s, 4); | |
967 | break; | |
968 | case 12: | |
969 | { | |
970 | u_int32_t rd_high; | |
971 | u_int32_t rd_low; | |
972 | ||
973 | rd_high = stream_getl (s); | |
974 | rd_low = stream_getl (s); | |
975 | stream_get (&attr->mp_nexthop_global_in, s, 4); | |
976 | } | |
977 | break; | |
978 | #ifdef HAVE_IPV6 | |
979 | case 16: | |
980 | stream_get (&attr->mp_nexthop_global, s, 16); | |
981 | break; | |
982 | case 32: | |
983 | stream_get (&attr->mp_nexthop_global, s, 16); | |
984 | stream_get (&attr->mp_nexthop_local, s, 16); | |
985 | if (! IN6_IS_ADDR_LINKLOCAL (&attr->mp_nexthop_local)) | |
986 | { | |
987 | char buf1[INET6_ADDRSTRLEN]; | |
988 | char buf2[INET6_ADDRSTRLEN]; | |
989 | ||
990 | if (BGP_DEBUG (update, UPDATE_IN)) | |
557865c2 | 991 | zlog_debug ("%s got two nexthop %s %s but second one is not a link-local nexthop", peer->host, |
718e3744 | 992 | inet_ntop (AF_INET6, &attr->mp_nexthop_global, |
993 | buf1, INET6_ADDRSTRLEN), | |
994 | inet_ntop (AF_INET6, &attr->mp_nexthop_local, | |
995 | buf2, INET6_ADDRSTRLEN)); | |
996 | ||
997 | attr->mp_nexthop_len = 16; | |
998 | } | |
999 | break; | |
1000 | #endif /* HAVE_IPV6 */ | |
1001 | default: | |
1002 | zlog_info ("Wrong multiprotocol next hop length: %d", | |
1003 | attr->mp_nexthop_len); | |
1004 | return -1; | |
718e3744 | 1005 | } |
1006 | ||
6e4ab12f PJ |
1007 | if (!STREAM_READABLE(s)) |
1008 | return -1; | |
718e3744 | 1009 | |
6e4ab12f PJ |
1010 | { |
1011 | u_char val; | |
1012 | if ((val = stream_getc (s))) | |
1013 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
1014 | peer->host, val); | |
1015 | } | |
1016 | ||
1017 | /* must have nrli_len, what is left of the attribute */ | |
1018 | nlri_len = length - (stream_get_getp(s) - start); | |
1019 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) | |
1020 | return -1; | |
718e3744 | 1021 | |
1022 | if (safi != BGP_SAFI_VPNV4) | |
1023 | { | |
1024 | ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), nlri_len); | |
1025 | if (ret < 0) | |
1026 | return -1; | |
1027 | } | |
1028 | ||
1029 | mp_update->afi = afi; | |
1030 | mp_update->safi = safi; | |
1031 | mp_update->nlri = stream_pnt (s); | |
1032 | mp_update->length = nlri_len; | |
1033 | ||
9985f83c | 1034 | stream_forward_getp (s, nlri_len); |
718e3744 | 1035 | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | /* Multiprotocol unreachable parse */ | |
94f2b392 | 1040 | static int |
6e4ab12f | 1041 | bgp_mp_unreach_parse (struct peer *peer, bgp_size_t length, |
718e3744 | 1042 | struct bgp_nlri *mp_withdraw) |
1043 | { | |
1044 | struct stream *s; | |
1045 | u_int16_t afi; | |
1046 | u_char safi; | |
718e3744 | 1047 | u_int16_t withdraw_len; |
1048 | int ret; | |
1049 | ||
1050 | s = peer->ibuf; | |
6e4ab12f PJ |
1051 | |
1052 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
1053 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1054 | return -1; | |
1055 | ||
718e3744 | 1056 | afi = stream_getw (s); |
1057 | safi = stream_getc (s); | |
6e4ab12f PJ |
1058 | |
1059 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; | |
718e3744 | 1060 | |
1061 | if (safi != BGP_SAFI_VPNV4) | |
1062 | { | |
1063 | ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), withdraw_len); | |
1064 | if (ret < 0) | |
1065 | return -1; | |
1066 | } | |
1067 | ||
1068 | mp_withdraw->afi = afi; | |
1069 | mp_withdraw->safi = safi; | |
1070 | mp_withdraw->nlri = stream_pnt (s); | |
1071 | mp_withdraw->length = withdraw_len; | |
1072 | ||
9985f83c | 1073 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1074 | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | /* Extended Community attribute. */ | |
94f2b392 | 1079 | static int |
718e3744 | 1080 | bgp_attr_ext_communities (struct peer *peer, bgp_size_t length, |
1081 | struct attr *attr, u_char flag) | |
1082 | { | |
1083 | if (length == 0) | |
1084 | attr->ecommunity = NULL; | |
1085 | else | |
1086 | { | |
5228ad27 | 1087 | attr->ecommunity = |
1088 | ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); | |
9985f83c | 1089 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1090 | } |
1091 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | /* BGP unknown attribute treatment. */ | |
94f2b392 | 1097 | static int |
718e3744 | 1098 | bgp_attr_unknown (struct peer *peer, struct attr *attr, u_char flag, |
1099 | u_char type, bgp_size_t length, u_char *startp) | |
1100 | { | |
1101 | bgp_size_t total; | |
1102 | struct transit *transit; | |
1103 | ||
f418446b | 1104 | if (BGP_DEBUG (normal, NORMAL)) |
1105 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", | |
1106 | peer->host, type, length); | |
1107 | ||
718e3744 | 1108 | if (BGP_DEBUG (events, EVENTS)) |
557865c2 | 1109 | zlog (peer->log, LOG_DEBUG, |
718e3744 | 1110 | "Unknown attribute type %d length %d is received", type, length); |
1111 | ||
1112 | /* Forward read pointer of input stream. */ | |
9985f83c | 1113 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1114 | |
1115 | /* Adjest total length to include type and length. */ | |
1116 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1117 | ||
1118 | /* If any of the mandatory well-known attributes are not recognized, | |
1119 | then the Error Subcode is set to Unrecognized Well-known | |
1120 | Attribute. The Data field contains the unrecognized attribute | |
1121 | (type, length and value). */ | |
1122 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) | |
1123 | { | |
1124 | /* Adjust startp to do not include flag value. */ | |
1125 | bgp_notify_send_with_data (peer, | |
1126 | BGP_NOTIFY_UPDATE_ERR, | |
1127 | BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
1128 | startp, total); | |
1129 | return -1; | |
1130 | } | |
1131 | ||
1132 | /* Unrecognized non-transitive optional attributes must be quietly | |
1133 | ignored and not passed along to other BGP peers. */ | |
1134 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
1135 | return 0; | |
1136 | ||
1137 | /* If a path with recognized transitive optional attribute is | |
1138 | accepted and passed along to other BGP peers and the Partial bit | |
1139 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
1140 | is not set back to 0 by the current AS. */ | |
1141 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
1142 | ||
1143 | /* Store transitive attribute to the end of attr->transit. */ | |
1144 | if (! attr->transit) | |
1145 | { | |
1146 | attr->transit = XMALLOC (MTYPE_TRANSIT, sizeof (struct transit)); | |
1147 | memset (attr->transit, 0, sizeof (struct transit)); | |
1148 | } | |
1149 | ||
1150 | transit = attr->transit; | |
1151 | ||
1152 | if (transit->val) | |
1153 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
1154 | transit->length + total); | |
1155 | else | |
1156 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
1157 | ||
1158 | memcpy (transit->val + transit->length, startp, total); | |
1159 | transit->length += total; | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | /* Read attribute of update packet. This function is called from | |
1165 | bgp_update() in bgpd.c. */ | |
1166 | int | |
1167 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, | |
1168 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) | |
1169 | { | |
1170 | int ret; | |
1171 | u_char flag; | |
1172 | u_char type; | |
1173 | bgp_size_t length; | |
1174 | u_char *startp, *endp; | |
1175 | u_char *attr_endp; | |
1176 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
1177 | ||
1178 | /* Initialize bitmap. */ | |
1179 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
1180 | ||
1181 | /* End pointer of BGP attribute. */ | |
1182 | endp = BGP_INPUT_PNT (peer) + size; | |
1183 | ||
1184 | /* Get attributes to the end of attribute length. */ | |
1185 | while (BGP_INPUT_PNT (peer) < endp) | |
1186 | { | |
1187 | /* Check remaining length check.*/ | |
1188 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
1189 | { | |
c29fdba7 | 1190 | /* XXX warning: long int format, int arg (arg 5) */ |
718e3744 | 1191 | zlog (peer->log, LOG_WARNING, |
a2b1ecd2 | 1192 | "%s error BGP attribute length %ld is smaller than min len", |
718e3744 | 1193 | peer->host, endp - STREAM_PNT (BGP_INPUT (peer))); |
1194 | ||
1195 | bgp_notify_send (peer, | |
1196 | BGP_NOTIFY_UPDATE_ERR, | |
1197 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1198 | return -1; | |
1199 | } | |
1200 | ||
1201 | /* Fetch attribute flag and type. */ | |
1202 | startp = BGP_INPUT_PNT (peer); | |
1203 | flag = stream_getc (BGP_INPUT (peer)); | |
1204 | type = stream_getc (BGP_INPUT (peer)); | |
1205 | ||
1206 | /* Check extended attribue length bit. */ | |
1207 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
1208 | length = stream_getw (BGP_INPUT (peer)); | |
1209 | else | |
1210 | length = stream_getc (BGP_INPUT (peer)); | |
1211 | ||
1212 | /* If any attribute appears more than once in the UPDATE | |
1213 | message, then the Error Subcode is set to Malformed Attribute | |
1214 | List. */ | |
1215 | ||
1216 | if (CHECK_BITMAP (seen, type)) | |
1217 | { | |
1218 | zlog (peer->log, LOG_WARNING, | |
1219 | "%s error BGP attribute type %d appears twice in a message", | |
1220 | peer->host, type); | |
1221 | ||
1222 | bgp_notify_send (peer, | |
1223 | BGP_NOTIFY_UPDATE_ERR, | |
1224 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1225 | return -1; | |
1226 | } | |
1227 | ||
1228 | /* Set type to bitmap to check duplicate attribute. `type' is | |
1229 | unsigned char so it never overflow bitmap range. */ | |
1230 | ||
1231 | SET_BITMAP (seen, type); | |
1232 | ||
1233 | /* Overflow check. */ | |
1234 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
1235 | ||
1236 | if (attr_endp > endp) | |
1237 | { | |
1238 | zlog (peer->log, LOG_WARNING, | |
1239 | "%s BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", peer->host, type, length, size, attr_endp, endp); | |
1240 | bgp_notify_send (peer, | |
1241 | BGP_NOTIFY_UPDATE_ERR, | |
1242 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1243 | return -1; | |
1244 | } | |
1245 | ||
1246 | /* OK check attribute and store it's value. */ | |
1247 | switch (type) | |
1248 | { | |
1249 | case BGP_ATTR_ORIGIN: | |
1250 | ret = bgp_attr_origin (peer, length, attr, flag, startp); | |
1251 | break; | |
1252 | case BGP_ATTR_AS_PATH: | |
1253 | ret = bgp_attr_aspath (peer, length, attr, flag, startp); | |
1254 | break; | |
1255 | case BGP_ATTR_NEXT_HOP: | |
1256 | ret = bgp_attr_nexthop (peer, length, attr, flag, startp); | |
1257 | break; | |
1258 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1259 | ret = bgp_attr_med (peer, length, attr, flag, startp); | |
1260 | break; | |
1261 | case BGP_ATTR_LOCAL_PREF: | |
1262 | ret = bgp_attr_local_pref (peer, length, attr, flag); | |
1263 | break; | |
1264 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1265 | ret = bgp_attr_atomic (peer, length, attr, flag); | |
1266 | break; | |
1267 | case BGP_ATTR_AGGREGATOR: | |
1268 | ret = bgp_attr_aggregator (peer, length, attr, flag); | |
1269 | break; | |
1270 | case BGP_ATTR_COMMUNITIES: | |
1271 | ret = bgp_attr_community (peer, length, attr, flag); | |
1272 | break; | |
1273 | case BGP_ATTR_ORIGINATOR_ID: | |
1274 | ret = bgp_attr_originator_id (peer, length, attr, flag); | |
1275 | break; | |
1276 | case BGP_ATTR_CLUSTER_LIST: | |
1277 | ret = bgp_attr_cluster_list (peer, length, attr, flag); | |
1278 | break; | |
1279 | case BGP_ATTR_MP_REACH_NLRI: | |
1280 | ret = bgp_mp_reach_parse (peer, length, attr, mp_update); | |
1281 | break; | |
1282 | case BGP_ATTR_MP_UNREACH_NLRI: | |
1283 | ret = bgp_mp_unreach_parse (peer, length, mp_withdraw); | |
1284 | break; | |
1285 | case BGP_ATTR_EXT_COMMUNITIES: | |
1286 | ret = bgp_attr_ext_communities (peer, length, attr, flag); | |
1287 | break; | |
1288 | default: | |
1289 | ret = bgp_attr_unknown (peer, attr, flag, type, length, startp); | |
1290 | break; | |
1291 | } | |
1292 | ||
1293 | /* If error occured immediately return to the caller. */ | |
1294 | if (ret < 0) | |
6e4ab12f PJ |
1295 | { |
1296 | zlog (peer->log, LOG_WARNING, | |
1297 | "%s: Attribute %s, parse error", | |
1298 | peer->host, | |
1299 | LOOKUP (attr_str, type)); | |
1300 | bgp_notify_send (peer, | |
1301 | BGP_NOTIFY_UPDATE_ERR, | |
1302 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1303 | return ret; | |
1304 | } | |
718e3744 | 1305 | |
1306 | /* Check the fetched length. */ | |
1307 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
1308 | { | |
1309 | zlog (peer->log, LOG_WARNING, | |
6e4ab12f PJ |
1310 | "%s: BGP attribute %s, fetch error", |
1311 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 1312 | bgp_notify_send (peer, |
1313 | BGP_NOTIFY_UPDATE_ERR, | |
1314 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1315 | return -1; | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | /* Check final read pointer is same as end pointer. */ | |
1320 | if (BGP_INPUT_PNT (peer) != endp) | |
1321 | { | |
1322 | zlog (peer->log, LOG_WARNING, | |
6e4ab12f PJ |
1323 | "%s BGP attribute %s, length mismatch", |
1324 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 1325 | bgp_notify_send (peer, |
1326 | BGP_NOTIFY_UPDATE_ERR, | |
1327 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1328 | return -1; | |
1329 | } | |
1330 | ||
1331 | /* Finally intern unknown attribute. */ | |
1332 | if (attr->transit) | |
1333 | attr->transit = transit_intern (attr->transit); | |
1334 | ||
1335 | return 0; | |
1336 | } | |
1337 | ||
1338 | /* Well-known attribute check. */ | |
1339 | int | |
1340 | bgp_attr_check (struct peer *peer, struct attr *attr) | |
1341 | { | |
1342 | u_char type = 0; | |
1343 | ||
1344 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) | |
1345 | type = BGP_ATTR_ORIGIN; | |
1346 | ||
1347 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
1348 | type = BGP_ATTR_AS_PATH; | |
1349 | ||
1350 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP))) | |
1351 | type = BGP_ATTR_NEXT_HOP; | |
1352 | ||
1353 | if (peer_sort (peer) == BGP_PEER_IBGP | |
1354 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) | |
1355 | type = BGP_ATTR_LOCAL_PREF; | |
1356 | ||
1357 | if (type) | |
1358 | { | |
1359 | zlog (peer->log, LOG_WARNING, | |
1360 | "%s Missing well-known attribute %d.", | |
1361 | peer->host, type); | |
1362 | bgp_notify_send_with_data (peer, | |
1363 | BGP_NOTIFY_UPDATE_ERR, | |
1364 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
1365 | &type, 1); | |
1366 | return -1; | |
1367 | } | |
1368 | return 0; | |
1369 | } | |
1370 | \f | |
1371 | int stream_put_prefix (struct stream *, struct prefix *); | |
1372 | ||
1373 | /* Make attribute packet. */ | |
1374 | bgp_size_t | |
1375 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
1376 | struct stream *s, struct attr *attr, struct prefix *p, | |
1377 | afi_t afi, safi_t safi, struct peer *from, | |
a3b6ea56 | 1378 | struct prefix_rd *prd, u_char *tag) |
718e3744 | 1379 | { |
fe69a505 | 1380 | size_t cp; |
1381 | unsigned int aspath_data_size; | |
718e3744 | 1382 | struct aspath *aspath; |
1383 | ||
1384 | if (! bgp) | |
1385 | bgp = bgp_get_default (); | |
1386 | ||
1387 | /* Remember current pointer. */ | |
9985f83c | 1388 | cp = stream_get_endp (s); |
718e3744 | 1389 | |
1390 | /* Origin attribute. */ | |
1391 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1392 | stream_putc (s, BGP_ATTR_ORIGIN); | |
1393 | stream_putc (s, 1); | |
1394 | stream_putc (s, attr->origin); | |
1395 | ||
1396 | /* AS path attribute. */ | |
1397 | ||
1398 | /* If remote-peer is EBGP */ | |
1399 | if (peer_sort (peer) == BGP_PEER_EBGP | |
1400 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) | |
fe69a505 | 1401 | || attr->aspath->segments == NULL) |
fee0f4c6 | 1402 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 1403 | { |
1404 | aspath = aspath_dup (attr->aspath); | |
1405 | ||
1406 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1407 | { | |
1408 | /* Strip the confed info, and then stuff our path CONFED_ID | |
1409 | on the front */ | |
1410 | aspath = aspath_delete_confed_seq (aspath); | |
1411 | aspath = aspath_add_seq (aspath, bgp->confed_id); | |
1412 | } | |
1413 | else | |
1414 | { | |
1415 | aspath = aspath_add_seq (aspath, peer->local_as); | |
1416 | if (peer->change_local_as) | |
1417 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
1418 | } | |
1419 | } | |
1420 | else if (peer_sort (peer) == BGP_PEER_CONFED) | |
1421 | { | |
1422 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
1423 | aspath = aspath_dup (attr->aspath); | |
1424 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
1425 | } | |
1426 | else | |
1427 | aspath = attr->aspath; | |
1428 | ||
1429 | /* AS path attribute extended length bit check. */ | |
fe69a505 | 1430 | aspath_data_size = aspath_size (aspath); |
1431 | if (aspath_data_size > 255) | |
718e3744 | 1432 | { |
1433 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1434 | stream_putc (s, BGP_ATTR_AS_PATH); | |
fe69a505 | 1435 | stream_putw (s, aspath_data_size); |
718e3744 | 1436 | } |
1437 | else | |
1438 | { | |
1439 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
fe69a505 | 1440 | stream_putc (s, BGP_ATTR_AS_PATH); |
1441 | stream_putc (s, aspath_data_size); | |
718e3744 | 1442 | } |
fe69a505 | 1443 | aspath_put (s, aspath); |
718e3744 | 1444 | |
1445 | if (aspath != attr->aspath) | |
1446 | aspath_free (aspath); | |
1447 | ||
1448 | /* Nexthop attribute. */ | |
1449 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP) && afi == AFI_IP) | |
1450 | { | |
1451 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1452 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
1453 | stream_putc (s, 4); | |
1454 | if (safi == SAFI_MPLS_VPN) | |
1455 | { | |
1456 | if (attr->nexthop.s_addr == 0) | |
1457 | stream_put_ipv4 (s, peer->nexthop.v4.s_addr); | |
1458 | else | |
1459 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
1460 | } | |
1461 | else | |
1462 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
1463 | } | |
1464 | ||
1465 | /* MED attribute. */ | |
1466 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
1467 | { | |
1468 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1469 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
1470 | stream_putc (s, 4); | |
1471 | stream_putl (s, attr->med); | |
1472 | } | |
1473 | ||
1474 | /* Local preference. */ | |
1475 | if (peer_sort (peer) == BGP_PEER_IBGP || | |
1476 | peer_sort (peer) == BGP_PEER_CONFED) | |
1477 | { | |
1478 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1479 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
1480 | stream_putc (s, 4); | |
1481 | stream_putl (s, attr->local_pref); | |
1482 | } | |
1483 | ||
1484 | /* Atomic aggregate. */ | |
1485 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
1486 | { | |
1487 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1488 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
1489 | stream_putc (s, 0); | |
1490 | } | |
1491 | ||
1492 | /* Aggregator. */ | |
1493 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
1494 | { | |
1495 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
1496 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
1497 | stream_putc (s, 6); | |
1498 | stream_putw (s, attr->aggregator_as); | |
1499 | stream_put_ipv4 (s, attr->aggregator_addr.s_addr); | |
1500 | } | |
1501 | ||
1502 | /* Community attribute. */ | |
1503 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
1504 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
1505 | { | |
1506 | if (attr->community->size * 4 > 255) | |
1507 | { | |
1508 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1509 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
1510 | stream_putw (s, attr->community->size * 4); | |
1511 | } | |
1512 | else | |
1513 | { | |
1514 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
1515 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
1516 | stream_putc (s, attr->community->size * 4); | |
1517 | } | |
1518 | stream_put (s, attr->community->val, attr->community->size * 4); | |
1519 | } | |
1520 | ||
1521 | /* Route Reflector. */ | |
1522 | if (peer_sort (peer) == BGP_PEER_IBGP | |
1523 | && from | |
1524 | && peer_sort (from) == BGP_PEER_IBGP) | |
1525 | { | |
1526 | /* Originator ID. */ | |
1527 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1528 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
1529 | stream_putc (s, 4); | |
1530 | ||
1531 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
1532 | stream_put_in_addr (s, &attr->originator_id); | |
34c3f81b PJ |
1533 | else |
1534 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 1535 | |
1536 | /* Cluster list. */ | |
1537 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1538 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
1539 | ||
1540 | if (attr->cluster) | |
1541 | { | |
1542 | stream_putc (s, attr->cluster->length + 4); | |
1543 | /* If this peer configuration's parent BGP has cluster_id. */ | |
1544 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
1545 | stream_put_in_addr (s, &bgp->cluster_id); | |
1546 | else | |
1547 | stream_put_in_addr (s, &bgp->router_id); | |
1548 | stream_put (s, attr->cluster->list, attr->cluster->length); | |
1549 | } | |
1550 | else | |
1551 | { | |
1552 | stream_putc (s, 4); | |
1553 | /* If this peer configuration's parent BGP has cluster_id. */ | |
1554 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
1555 | stream_put_in_addr (s, &bgp->cluster_id); | |
1556 | else | |
1557 | stream_put_in_addr (s, &bgp->router_id); | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | #ifdef HAVE_IPV6 | |
1562 | /* If p is IPv6 address put it into attribute. */ | |
1563 | if (p->family == AF_INET6) | |
1564 | { | |
1565 | unsigned long sizep; | |
718e3744 | 1566 | |
1567 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1568 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 1569 | sizep = stream_get_endp (s); |
718e3744 | 1570 | stream_putc (s, 0); /* Length of this attribute. */ |
1571 | stream_putw (s, AFI_IP6); /* AFI */ | |
1572 | stream_putc (s, safi); /* SAFI */ | |
1573 | ||
1574 | stream_putc (s, attr->mp_nexthop_len); | |
1575 | ||
1576 | if (attr->mp_nexthop_len == 16) | |
1577 | stream_put (s, &attr->mp_nexthop_global, 16); | |
1578 | else if (attr->mp_nexthop_len == 32) | |
1579 | { | |
1580 | stream_put (s, &attr->mp_nexthop_global, 16); | |
1581 | stream_put (s, &attr->mp_nexthop_local, 16); | |
1582 | } | |
1583 | ||
1584 | /* SNPA */ | |
1585 | stream_putc (s, 0); | |
1586 | ||
718e3744 | 1587 | /* Prefix write. */ |
1588 | stream_put_prefix (s, p); | |
1589 | ||
1590 | /* Set MP attribute length. */ | |
9985f83c | 1591 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 1592 | } |
1593 | #endif /* HAVE_IPV6 */ | |
1594 | ||
1595 | if (p->family == AF_INET && safi == SAFI_MULTICAST) | |
1596 | { | |
1597 | unsigned long sizep; | |
718e3744 | 1598 | |
1599 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1600 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 1601 | sizep = stream_get_endp (s); |
718e3744 | 1602 | stream_putc (s, 0); /* Length of this attribute. */ |
1603 | stream_putw (s, AFI_IP); /* AFI */ | |
1604 | stream_putc (s, SAFI_MULTICAST); /* SAFI */ | |
1605 | ||
1606 | stream_putc (s, 4); | |
1607 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
1608 | ||
1609 | /* SNPA */ | |
1610 | stream_putc (s, 0); | |
1611 | ||
718e3744 | 1612 | /* Prefix write. */ |
1613 | stream_put_prefix (s, p); | |
1614 | ||
1615 | /* Set MP attribute length. */ | |
9985f83c | 1616 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 1617 | } |
1618 | ||
1619 | if (p->family == AF_INET && safi == SAFI_MPLS_VPN) | |
1620 | { | |
1621 | unsigned long sizep; | |
718e3744 | 1622 | |
1623 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1624 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 1625 | sizep = stream_get_endp (s); |
718e3744 | 1626 | stream_putc (s, 0); /* Length of this attribute. */ |
1627 | stream_putw (s, AFI_IP); /* AFI */ | |
1628 | stream_putc (s, BGP_SAFI_VPNV4); /* SAFI */ | |
1629 | ||
1630 | stream_putc (s, 12); | |
1631 | stream_putl (s, 0); | |
1632 | stream_putl (s, 0); | |
1633 | stream_put (s, &attr->mp_nexthop_global_in, 4); | |
1634 | ||
1635 | /* SNPA */ | |
1636 | stream_putc (s, 0); | |
1637 | ||
718e3744 | 1638 | /* Tag, RD, Prefix write. */ |
1639 | stream_putc (s, p->prefixlen + 88); | |
1640 | stream_put (s, tag, 3); | |
1641 | stream_put (s, prd->val, 8); | |
1642 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
1643 | ||
1644 | /* Set MP attribute length. */ | |
9985f83c | 1645 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 1646 | } |
1647 | ||
1648 | /* Extended Communities attribute. */ | |
1649 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
1650 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
1651 | { | |
4372df71 | 1652 | if (peer_sort (peer) == BGP_PEER_IBGP || peer_sort (peer) == BGP_PEER_CONFED) |
718e3744 | 1653 | { |
4372df71 | 1654 | if (attr->ecommunity->size * 8 > 255) |
1655 | { | |
1656 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1657 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
1658 | stream_putw (s, attr->ecommunity->size * 8); | |
1659 | } | |
1660 | else | |
1661 | { | |
1662 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
1663 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
1664 | stream_putc (s, attr->ecommunity->size * 8); | |
1665 | } | |
1666 | stream_put (s, attr->ecommunity->val, attr->ecommunity->size * 8); | |
718e3744 | 1667 | } |
1668 | else | |
1669 | { | |
5228ad27 | 1670 | u_int8_t *pnt; |
4372df71 | 1671 | int tbit; |
1672 | int ecom_tr_size = 0; | |
1673 | int i; | |
1674 | ||
1675 | for (i = 0; i < attr->ecommunity->size; i++) | |
1676 | { | |
1677 | pnt = attr->ecommunity->val + (i * 8); | |
1678 | tbit = *pnt; | |
1679 | ||
1680 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
1681 | continue; | |
1682 | ||
1683 | ecom_tr_size++; | |
1684 | } | |
1685 | ||
1686 | if (ecom_tr_size) | |
1687 | { | |
1688 | if (ecom_tr_size * 8 > 255) | |
1689 | { | |
1690 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1691 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
1692 | stream_putw (s, ecom_tr_size * 8); | |
1693 | } | |
1694 | else | |
1695 | { | |
1696 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
1697 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
1698 | stream_putc (s, ecom_tr_size * 8); | |
1699 | } | |
1700 | ||
1701 | for (i = 0; i < attr->ecommunity->size; i++) | |
1702 | { | |
1703 | pnt = attr->ecommunity->val + (i * 8); | |
1704 | tbit = *pnt; | |
1705 | ||
1706 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
1707 | continue; | |
1708 | ||
1709 | stream_put (s, pnt, 8); | |
1710 | } | |
1711 | } | |
718e3744 | 1712 | } |
718e3744 | 1713 | } |
1714 | ||
1715 | /* Unknown transit attribute. */ | |
1716 | if (attr->transit) | |
1717 | stream_put (s, attr->transit->val, attr->transit->length); | |
1718 | ||
1719 | /* Return total size of attribute. */ | |
9985f83c | 1720 | return stream_get_endp (s) - cp; |
718e3744 | 1721 | } |
1722 | ||
1723 | bgp_size_t | |
1724 | bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p, | |
1725 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
a3b6ea56 | 1726 | u_char *tag) |
718e3744 | 1727 | { |
1728 | unsigned long cp; | |
1729 | unsigned long attrlen_pnt; | |
1730 | bgp_size_t size; | |
1731 | ||
9985f83c | 1732 | cp = stream_get_endp (s); |
718e3744 | 1733 | |
1734 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1735 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); | |
1736 | ||
9985f83c | 1737 | attrlen_pnt = stream_get_endp (s); |
718e3744 | 1738 | stream_putc (s, 0); /* Length of this attribute. */ |
1739 | ||
1740 | stream_putw (s, family2afi (p->family)); | |
1741 | ||
1742 | if (safi == SAFI_MPLS_VPN) | |
1743 | { | |
1744 | /* SAFI */ | |
1745 | stream_putc (s, BGP_SAFI_VPNV4); | |
1746 | ||
1747 | /* prefix. */ | |
1748 | stream_putc (s, p->prefixlen + 88); | |
1749 | stream_put (s, tag, 3); | |
1750 | stream_put (s, prd->val, 8); | |
1751 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
1752 | } | |
1753 | else | |
1754 | { | |
1755 | /* SAFI */ | |
1756 | stream_putc (s, safi); | |
1757 | ||
1758 | /* prefix */ | |
1759 | stream_put_prefix (s, p); | |
1760 | } | |
1761 | ||
1762 | /* Set MP attribute length. */ | |
9985f83c | 1763 | size = stream_get_endp (s) - attrlen_pnt - 1; |
718e3744 | 1764 | stream_putc_at (s, attrlen_pnt, size); |
1765 | ||
9985f83c | 1766 | return stream_get_endp (s) - cp; |
718e3744 | 1767 | } |
1768 | ||
1769 | /* Initialization of attribute. */ | |
1770 | void | |
fe69a505 | 1771 | bgp_attr_init (void) |
718e3744 | 1772 | { |
1773 | void attrhash_init (); | |
1774 | ||
1775 | aspath_init (); | |
1776 | attrhash_init (); | |
1777 | community_init (); | |
1778 | ecommunity_init (); | |
1779 | cluster_init (); | |
1780 | transit_init (); | |
1781 | } | |
1782 | ||
1783 | /* Make attribute packet. */ | |
1784 | void | |
a384592f | 1785 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
1786 | struct prefix *prefix) | |
718e3744 | 1787 | { |
1788 | unsigned long cp; | |
1789 | unsigned long len; | |
fe69a505 | 1790 | unsigned int aspathlen; |
718e3744 | 1791 | struct aspath *aspath; |
1792 | ||
1793 | /* Remember current pointer. */ | |
9985f83c | 1794 | cp = stream_get_endp (s); |
718e3744 | 1795 | |
1796 | /* Place holder of length. */ | |
1797 | stream_putw (s, 0); | |
1798 | ||
1799 | /* Origin attribute. */ | |
1800 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1801 | stream_putc (s, BGP_ATTR_ORIGIN); | |
1802 | stream_putc (s, 1); | |
1803 | stream_putc (s, attr->origin); | |
1804 | ||
1805 | aspath = attr->aspath; | |
1806 | ||
fe69a505 | 1807 | if ( (aspathlen = aspath_size (aspath)) > 255 ) |
718e3744 | 1808 | { |
1809 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1810 | stream_putc (s, BGP_ATTR_AS_PATH); | |
fe69a505 | 1811 | stream_putw (s, aspathlen); |
718e3744 | 1812 | } |
1813 | else | |
1814 | { | |
1815 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1816 | stream_putc (s, BGP_ATTR_AS_PATH); | |
fe69a505 | 1817 | stream_putc (s, aspathlen); |
718e3744 | 1818 | } |
fe69a505 | 1819 | aspath_put (s, aspath); |
718e3744 | 1820 | |
1821 | /* Nexthop attribute. */ | |
a384592f | 1822 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
1823 | if(prefix != NULL | |
1824 | #ifdef HAVE_IPV6 | |
1825 | && prefix->family != AF_INET6 | |
1826 | #endif /* HAVE_IPV6 */ | |
1827 | ) | |
1828 | { | |
1829 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1830 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
1831 | stream_putc (s, 4); | |
1832 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
1833 | } | |
718e3744 | 1834 | |
1835 | /* MED attribute. */ | |
1836 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
1837 | { | |
1838 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1839 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
1840 | stream_putc (s, 4); | |
1841 | stream_putl (s, attr->med); | |
1842 | } | |
1843 | ||
1844 | /* Local preference. */ | |
1845 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
1846 | { | |
1847 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1848 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
1849 | stream_putc (s, 4); | |
1850 | stream_putl (s, attr->local_pref); | |
1851 | } | |
1852 | ||
1853 | /* Atomic aggregate. */ | |
1854 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
1855 | { | |
1856 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1857 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
1858 | stream_putc (s, 0); | |
1859 | } | |
1860 | ||
1861 | /* Aggregator. */ | |
1862 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
1863 | { | |
1864 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
1865 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
1866 | stream_putc (s, 6); | |
1867 | stream_putw (s, attr->aggregator_as); | |
1868 | stream_put_ipv4 (s, attr->aggregator_addr.s_addr); | |
1869 | } | |
1870 | ||
1871 | /* Community attribute. */ | |
1872 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
1873 | { | |
1874 | if (attr->community->size * 4 > 255) | |
1875 | { | |
1876 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1877 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
1878 | stream_putw (s, attr->community->size * 4); | |
1879 | } | |
1880 | else | |
1881 | { | |
1882 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
1883 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
1884 | stream_putc (s, attr->community->size * 4); | |
1885 | } | |
1886 | stream_put (s, attr->community->val, attr->community->size * 4); | |
1887 | } | |
1888 | ||
a384592f | 1889 | #ifdef HAVE_IPV6 |
1890 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
1891 | if(prefix != NULL && prefix->family == AF_INET6 && | |
1892 | (attr->mp_nexthop_len == 16 || attr->mp_nexthop_len == 32) ) | |
1893 | { | |
1894 | int sizep; | |
1895 | ||
1896 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
1897 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 1898 | sizep = stream_get_endp (s); |
a384592f | 1899 | |
1900 | /* MP header */ | |
1901 | stream_putc (s, 0); /* Length of this attribute. */ | |
1902 | stream_putw(s, AFI_IP6); /* AFI */ | |
1903 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
1904 | ||
1905 | /* Next hop */ | |
1906 | stream_putc(s, attr->mp_nexthop_len); | |
1907 | stream_put(s, &attr->mp_nexthop_global, 16); | |
1908 | if(attr->mp_nexthop_len == 32) | |
1909 | stream_put(s, &attr->mp_nexthop_local, 16); | |
1910 | ||
1911 | /* SNPA */ | |
1912 | stream_putc(s, 0); | |
1913 | ||
1914 | /* Prefix */ | |
1915 | stream_put_prefix(s, prefix); | |
1916 | ||
1917 | /* Set MP attribute length. */ | |
9985f83c | 1918 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 1919 | } |
1920 | #endif /* HAVE_IPV6 */ | |
1921 | ||
718e3744 | 1922 | /* Return total size of attribute. */ |
9985f83c | 1923 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 1924 | stream_putw_at (s, cp, len); |
1925 | } |