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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. */ | |
9bddac4b | 42 | static const 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" }, | |
0b2aa3a0 PJ |
59 | { BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" }, |
60 | { BGP_ATTR_AS4_PATH, "AS4_PATH" }, | |
61 | { BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" }, | |
62 | { BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" }, | |
718e3744 | 63 | }; |
9bddac4b | 64 | static const int attr_str_max = sizeof(attr_str)/sizeof(attr_str[0]); |
718e3744 | 65 | \f |
9bddac4b | 66 | static struct hash *cluster_hash; |
718e3744 | 67 | |
94f2b392 | 68 | static void * |
923de654 | 69 | cluster_hash_alloc (void *p) |
718e3744 | 70 | { |
923de654 | 71 | struct cluster_list * val = (struct cluster_list *) p; |
718e3744 | 72 | struct cluster_list *cluster; |
73 | ||
74 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
75 | cluster->length = val->length; | |
76 | ||
77 | if (cluster->length) | |
78 | { | |
79 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
80 | memcpy (cluster->list, val->list, val->length); | |
81 | } | |
82 | else | |
83 | cluster->list = NULL; | |
84 | ||
85 | cluster->refcnt = 0; | |
86 | ||
87 | return cluster; | |
88 | } | |
89 | ||
90 | /* Cluster list related functions. */ | |
94f2b392 | 91 | static struct cluster_list * |
5228ad27 | 92 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 93 | { |
94 | struct cluster_list tmp; | |
95 | struct cluster_list *cluster; | |
96 | ||
97 | tmp.length = length; | |
5228ad27 | 98 | tmp.list = pnt; |
718e3744 | 99 | |
100 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
101 | cluster->refcnt++; | |
102 | return cluster; | |
103 | } | |
104 | ||
105 | int | |
106 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
107 | { | |
108 | int i; | |
109 | ||
110 | for (i = 0; i < cluster->length / 4; i++) | |
111 | if (cluster->list[i].s_addr == originator.s_addr) | |
112 | return 1; | |
113 | return 0; | |
114 | } | |
115 | ||
94f2b392 | 116 | static unsigned int |
923de654 | 117 | cluster_hash_key_make (void *p) |
718e3744 | 118 | { |
923de654 | 119 | struct cluster_list * cluster = (struct cluster_list *) p; |
718e3744 | 120 | unsigned int key = 0; |
121 | int length; | |
122 | caddr_t pnt; | |
123 | ||
124 | length = cluster->length; | |
125 | pnt = (caddr_t) cluster->list; | |
126 | ||
127 | while (length) | |
128 | key += pnt[--length]; | |
129 | ||
130 | return key; | |
131 | } | |
132 | ||
94f2b392 | 133 | static int |
ffe11cfb | 134 | cluster_hash_cmp (const void *p1, const void *p2) |
718e3744 | 135 | { |
ffe11cfb SH |
136 | const struct cluster_list * cluster1 = p1; |
137 | const struct cluster_list * cluster2 = p2; | |
923de654 | 138 | |
ffe11cfb SH |
139 | return (cluster1->length == cluster2->length && |
140 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 141 | } |
142 | ||
94f2b392 | 143 | static void |
718e3744 | 144 | cluster_free (struct cluster_list *cluster) |
145 | { | |
146 | if (cluster->list) | |
147 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
148 | XFREE (MTYPE_CLUSTER, cluster); | |
149 | } | |
150 | ||
228da428 | 151 | #if 0 |
94f2b392 | 152 | static struct cluster_list * |
718e3744 | 153 | cluster_dup (struct cluster_list *cluster) |
154 | { | |
155 | struct cluster_list *new; | |
156 | ||
393deb9b | 157 | new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); |
718e3744 | 158 | new->length = cluster->length; |
159 | ||
160 | if (cluster->length) | |
161 | { | |
162 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
163 | memcpy (new->list, cluster->list, cluster->length); | |
164 | } | |
165 | else | |
166 | new->list = NULL; | |
167 | ||
168 | return new; | |
169 | } | |
228da428 | 170 | #endif |
718e3744 | 171 | |
94f2b392 | 172 | static struct cluster_list * |
718e3744 | 173 | cluster_intern (struct cluster_list *cluster) |
174 | { | |
175 | struct cluster_list *find; | |
176 | ||
177 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
178 | find->refcnt++; | |
179 | ||
180 | return find; | |
181 | } | |
182 | ||
183 | void | |
184 | cluster_unintern (struct cluster_list *cluster) | |
185 | { | |
186 | struct cluster_list *ret; | |
187 | ||
188 | if (cluster->refcnt) | |
189 | cluster->refcnt--; | |
190 | ||
191 | if (cluster->refcnt == 0) | |
192 | { | |
193 | ret = hash_release (cluster_hash, cluster); | |
194 | cluster_free (cluster); | |
195 | } | |
196 | } | |
197 | ||
94f2b392 | 198 | static void |
199 | cluster_init (void) | |
718e3744 | 200 | { |
201 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp); | |
202 | } | |
228da428 CC |
203 | |
204 | static void | |
205 | cluster_finish (void) | |
206 | { | |
207 | hash_free (cluster_hash); | |
208 | cluster_hash = NULL; | |
209 | } | |
718e3744 | 210 | \f |
211 | /* Unknown transit attribute. */ | |
9bddac4b | 212 | static struct hash *transit_hash; |
718e3744 | 213 | |
94f2b392 | 214 | static void |
718e3744 | 215 | transit_free (struct transit *transit) |
216 | { | |
217 | if (transit->val) | |
218 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
219 | XFREE (MTYPE_TRANSIT, transit); | |
220 | } | |
221 | ||
923de654 | 222 | |
94f2b392 | 223 | static void * |
923de654 | 224 | transit_hash_alloc (void *p) |
718e3744 | 225 | { |
226 | /* Transit structure is already allocated. */ | |
923de654 | 227 | return p; |
718e3744 | 228 | } |
229 | ||
94f2b392 | 230 | static struct transit * |
718e3744 | 231 | transit_intern (struct transit *transit) |
232 | { | |
233 | struct transit *find; | |
234 | ||
235 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
236 | if (find != transit) | |
237 | transit_free (transit); | |
238 | find->refcnt++; | |
239 | ||
240 | return find; | |
241 | } | |
242 | ||
243 | void | |
244 | transit_unintern (struct transit *transit) | |
245 | { | |
246 | struct transit *ret; | |
247 | ||
248 | if (transit->refcnt) | |
249 | transit->refcnt--; | |
250 | ||
251 | if (transit->refcnt == 0) | |
252 | { | |
253 | ret = hash_release (transit_hash, transit); | |
254 | transit_free (transit); | |
255 | } | |
256 | } | |
257 | ||
94f2b392 | 258 | static unsigned int |
923de654 | 259 | transit_hash_key_make (void *p) |
718e3744 | 260 | { |
923de654 | 261 | struct transit * transit = (struct transit *) p; |
718e3744 | 262 | unsigned int key = 0; |
263 | int length; | |
264 | caddr_t pnt; | |
265 | ||
266 | length = transit->length; | |
267 | pnt = (caddr_t) transit->val; | |
268 | ||
269 | while (length) | |
270 | key += pnt[--length]; | |
271 | ||
272 | return key; | |
273 | } | |
274 | ||
94f2b392 | 275 | static int |
ffe11cfb | 276 | transit_hash_cmp (const void *p1, const void *p2) |
718e3744 | 277 | { |
ffe11cfb SH |
278 | const struct transit * transit1 = p1; |
279 | const struct transit * transit2 = p2; | |
923de654 | 280 | |
ffe11cfb SH |
281 | return (transit1->length == transit2->length && |
282 | memcmp (transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 283 | } |
284 | ||
94f2b392 | 285 | static void |
66e5cd87 | 286 | transit_init (void) |
718e3744 | 287 | { |
288 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp); | |
289 | } | |
228da428 CC |
290 | |
291 | static void | |
292 | transit_finish (void) | |
293 | { | |
294 | hash_free (transit_hash); | |
295 | transit_hash = NULL; | |
296 | } | |
718e3744 | 297 | \f |
298 | /* Attribute hash routines. */ | |
9bddac4b | 299 | static struct hash *attrhash; |
718e3744 | 300 | |
fb982c25 PJ |
301 | static struct attr_extra * |
302 | bgp_attr_extra_new (void) | |
303 | { | |
304 | return XCALLOC (MTYPE_ATTR_EXTRA, sizeof (struct attr_extra)); | |
305 | } | |
306 | ||
307 | void | |
308 | bgp_attr_extra_free (struct attr *attr) | |
309 | { | |
310 | if (attr->extra) | |
311 | { | |
312 | XFREE (MTYPE_ATTR_EXTRA, attr->extra); | |
313 | attr->extra = NULL; | |
314 | } | |
315 | } | |
316 | ||
317 | struct attr_extra * | |
318 | bgp_attr_extra_get (struct attr *attr) | |
319 | { | |
320 | if (!attr->extra) | |
321 | attr->extra = bgp_attr_extra_new(); | |
322 | return attr->extra; | |
323 | } | |
324 | ||
325 | /* Shallow copy of an attribute | |
326 | * Though, not so shallow that it doesn't copy the contents | |
327 | * of the attr_extra pointed to by 'extra' | |
328 | */ | |
329 | void | |
330 | bgp_attr_dup (struct attr *new, struct attr *orig) | |
331 | { | |
332 | *new = *orig; | |
333 | if (orig->extra) | |
334 | { | |
335 | new->extra = bgp_attr_extra_new(); | |
336 | *new->extra = *orig->extra; | |
337 | } | |
338 | } | |
339 | ||
cbdfbaa5 PJ |
340 | unsigned long int |
341 | attr_count (void) | |
342 | { | |
343 | return attrhash->count; | |
344 | } | |
345 | ||
346 | unsigned long int | |
347 | attr_unknown_count (void) | |
348 | { | |
349 | return transit_hash->count; | |
350 | } | |
351 | ||
718e3744 | 352 | unsigned int |
923de654 | 353 | attrhash_key_make (void *p) |
718e3744 | 354 | { |
923de654 | 355 | struct attr * attr = (struct attr *) p; |
718e3744 | 356 | unsigned int key = 0; |
357 | ||
358 | key += attr->origin; | |
359 | key += attr->nexthop.s_addr; | |
360 | key += attr->med; | |
361 | key += attr->local_pref; | |
41367172 PJ |
362 | if (attr->pathlimit.as) |
363 | { | |
364 | key += attr->pathlimit.ttl; | |
365 | key += attr->pathlimit.as; | |
366 | } | |
fb982c25 PJ |
367 | |
368 | if (attr->extra) | |
369 | { | |
370 | key += attr->extra->aggregator_as; | |
371 | key += attr->extra->aggregator_addr.s_addr; | |
372 | key += attr->extra->weight; | |
373 | key += attr->extra->mp_nexthop_global_in.s_addr; | |
374 | } | |
375 | ||
718e3744 | 376 | if (attr->aspath) |
377 | key += aspath_key_make (attr->aspath); | |
378 | if (attr->community) | |
379 | key += community_hash_make (attr->community); | |
fb982c25 PJ |
380 | |
381 | if (attr->extra) | |
382 | { | |
383 | if (attr->extra->ecommunity) | |
384 | key += ecommunity_hash_make (attr->extra->ecommunity); | |
385 | if (attr->extra->cluster) | |
386 | key += cluster_hash_key_make (attr->extra->cluster); | |
387 | if (attr->extra->transit) | |
388 | key += transit_hash_key_make (attr->extra->transit); | |
718e3744 | 389 | |
390 | #ifdef HAVE_IPV6 | |
fb982c25 PJ |
391 | { |
392 | int i; | |
393 | ||
394 | key += attr->extra->mp_nexthop_len; | |
395 | for (i = 0; i < 16; i++) | |
396 | key += attr->extra->mp_nexthop_global.s6_addr[i]; | |
397 | for (i = 0; i < 16; i++) | |
398 | key += attr->extra->mp_nexthop_local.s6_addr[i]; | |
399 | } | |
718e3744 | 400 | #endif /* HAVE_IPV6 */ |
fb982c25 | 401 | } |
718e3744 | 402 | |
403 | return key; | |
404 | } | |
405 | ||
406 | int | |
ffe11cfb | 407 | attrhash_cmp (const void *p1, const void *p2) |
718e3744 | 408 | { |
ffe11cfb SH |
409 | const struct attr * attr1 = p1; |
410 | const struct attr * attr2 = p2; | |
923de654 | 411 | |
718e3744 | 412 | if (attr1->flag == attr2->flag |
413 | && attr1->origin == attr2->origin | |
414 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
fb982c25 PJ |
415 | && attr1->aspath == attr2->aspath |
416 | && attr1->community == attr2->community | |
718e3744 | 417 | && attr1->med == attr2->med |
41367172 PJ |
418 | && attr1->local_pref == attr2->local_pref |
419 | && attr1->pathlimit.ttl == attr2->pathlimit.ttl | |
420 | && attr1->pathlimit.as == attr2->pathlimit.as) | |
fb982c25 | 421 | { |
ffe11cfb SH |
422 | const struct attr_extra *ae1 = attr1->extra; |
423 | const struct attr_extra *ae2 = attr2->extra; | |
fb982c25 PJ |
424 | |
425 | if (ae1 && ae2 | |
426 | && ae1->aggregator_as == ae2->aggregator_as | |
427 | && ae1->aggregator_addr.s_addr == ae2->aggregator_addr.s_addr | |
428 | && ae1->weight == ae2->weight | |
718e3744 | 429 | #ifdef HAVE_IPV6 |
fb982c25 PJ |
430 | && ae1->mp_nexthop_len == ae2->mp_nexthop_len |
431 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_global, &ae2->mp_nexthop_global) | |
432 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_local, &ae2->mp_nexthop_local) | |
718e3744 | 433 | #endif /* HAVE_IPV6 */ |
fb982c25 PJ |
434 | && IPV4_ADDR_SAME (&ae1->mp_nexthop_global_in, &ae2->mp_nexthop_global_in) |
435 | && ae1->ecommunity == ae2->ecommunity | |
436 | && ae1->cluster == ae2->cluster | |
437 | && ae1->transit == ae2->transit) | |
438 | return 1; | |
439 | else if (ae1 || ae2) | |
440 | return 0; | |
441 | /* neither attribute has extra attributes, so they're same */ | |
442 | return 1; | |
443 | } | |
718e3744 | 444 | else |
445 | return 0; | |
446 | } | |
447 | ||
94f2b392 | 448 | static void |
ffe11cfb | 449 | attrhash_init (void) |
718e3744 | 450 | { |
451 | attrhash = hash_create (attrhash_key_make, attrhash_cmp); | |
452 | } | |
453 | ||
228da428 CC |
454 | static void |
455 | attrhash_finish (void) | |
456 | { | |
457 | hash_free (attrhash); | |
458 | attrhash = NULL; | |
459 | } | |
460 | ||
94f2b392 | 461 | static void |
718e3744 | 462 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
463 | { | |
464 | struct attr *attr = backet->data; | |
465 | ||
466 | vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt, | |
467 | inet_ntoa (attr->nexthop), VTY_NEWLINE); | |
468 | } | |
469 | ||
470 | void | |
471 | attr_show_all (struct vty *vty) | |
472 | { | |
473 | hash_iterate (attrhash, | |
474 | (void (*)(struct hash_backet *, void *)) | |
475 | attr_show_all_iterator, | |
476 | vty); | |
477 | } | |
478 | ||
94f2b392 | 479 | static void * |
923de654 | 480 | bgp_attr_hash_alloc (void *p) |
718e3744 | 481 | { |
923de654 | 482 | struct attr * val = (struct attr *) p; |
718e3744 | 483 | struct attr *attr; |
484 | ||
485 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
486 | *attr = *val; | |
fb982c25 PJ |
487 | if (val->extra) |
488 | { | |
489 | attr->extra = bgp_attr_extra_new (); | |
490 | *attr->extra = *val->extra; | |
491 | } | |
718e3744 | 492 | attr->refcnt = 0; |
493 | return attr; | |
494 | } | |
495 | ||
496 | /* Internet argument attribute. */ | |
497 | struct attr * | |
498 | bgp_attr_intern (struct attr *attr) | |
499 | { | |
500 | struct attr *find; | |
501 | ||
502 | /* Intern referenced strucutre. */ | |
503 | if (attr->aspath) | |
504 | { | |
505 | if (! attr->aspath->refcnt) | |
506 | attr->aspath = aspath_intern (attr->aspath); | |
507 | else | |
508 | attr->aspath->refcnt++; | |
509 | } | |
510 | if (attr->community) | |
511 | { | |
512 | if (! attr->community->refcnt) | |
513 | attr->community = community_intern (attr->community); | |
514 | else | |
515 | attr->community->refcnt++; | |
516 | } | |
fb982c25 | 517 | if (attr->extra) |
718e3744 | 518 | { |
fb982c25 PJ |
519 | struct attr_extra *attre = attr->extra; |
520 | ||
521 | if (attre->ecommunity) | |
522 | { | |
523 | if (! attre->ecommunity->refcnt) | |
524 | attre->ecommunity = ecommunity_intern (attre->ecommunity); | |
525 | else | |
526 | attre->ecommunity->refcnt++; | |
527 | } | |
528 | if (attre->cluster) | |
529 | { | |
530 | if (! attre->cluster->refcnt) | |
531 | attre->cluster = cluster_intern (attre->cluster); | |
532 | else | |
533 | attre->cluster->refcnt++; | |
534 | } | |
535 | if (attre->transit) | |
536 | { | |
537 | if (! attre->transit->refcnt) | |
538 | attre->transit = transit_intern (attre->transit); | |
539 | else | |
540 | attre->transit->refcnt++; | |
541 | } | |
718e3744 | 542 | } |
543 | ||
544 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); | |
545 | find->refcnt++; | |
546 | ||
547 | return find; | |
548 | } | |
549 | ||
03e214c8 | 550 | |
718e3744 | 551 | /* Make network statement's attribute. */ |
552 | struct attr * | |
553 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
554 | { | |
555 | memset (attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
556 | bgp_attr_extra_get (attr); |
557 | ||
718e3744 | 558 | attr->origin = origin; |
559 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
560 | attr->aspath = aspath_empty (); | |
561 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
fb982c25 | 562 | attr->extra->weight = BGP_ATTR_DEFAULT_WEIGHT; |
718e3744 | 563 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
564 | #ifdef HAVE_IPV6 | |
fb982c25 | 565 | attr->extra->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 566 | #endif |
03e214c8 | 567 | |
718e3744 | 568 | return attr; |
569 | } | |
570 | ||
03e214c8 | 571 | |
718e3744 | 572 | /* Make network statement's attribute. */ |
573 | struct attr * | |
574 | bgp_attr_default_intern (u_char origin) | |
575 | { | |
576 | struct attr attr; | |
577 | struct attr *new; | |
fb982c25 PJ |
578 | struct attr_extra *attre; |
579 | ||
580 | memset (&attr, 0, sizeof (struct attr)); | |
581 | attre = bgp_attr_extra_get (&attr); | |
582 | ||
03e214c8 | 583 | bgp_attr_default_set(&attr, origin); |
718e3744 | 584 | |
585 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
586 | bgp_attr_extra_free (&attr); |
587 | ||
718e3744 | 588 | aspath_unintern (new->aspath); |
589 | return new; | |
590 | } | |
591 | ||
592 | struct attr * | |
593 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
594 | struct aspath *aspath, | |
595 | struct community *community, int as_set) | |
596 | { | |
597 | struct attr attr; | |
598 | struct attr *new; | |
fb982c25 | 599 | struct attr_extra *attre; |
718e3744 | 600 | |
601 | memset (&attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
602 | attre = bgp_attr_extra_get (&attr); |
603 | ||
718e3744 | 604 | /* Origin attribute. */ |
605 | attr.origin = origin; | |
606 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
607 | ||
608 | /* AS path attribute. */ | |
609 | if (aspath) | |
610 | attr.aspath = aspath_intern (aspath); | |
611 | else | |
612 | attr.aspath = aspath_empty (); | |
613 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
614 | ||
615 | /* Next hop attribute. */ | |
616 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
617 | ||
618 | if (community) | |
619 | { | |
620 | attr.community = community; | |
621 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
622 | } | |
623 | ||
fb982c25 | 624 | attre->weight = BGP_ATTR_DEFAULT_WEIGHT; |
718e3744 | 625 | #ifdef HAVE_IPV6 |
fb982c25 | 626 | attre->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 627 | #endif |
628 | if (! as_set) | |
629 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
630 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
631 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
fb982c25 | 632 | attre->aggregator_as = bgp->confed_id; |
718e3744 | 633 | else |
fb982c25 PJ |
634 | attre->aggregator_as = bgp->as; |
635 | attre->aggregator_addr = bgp->router_id; | |
718e3744 | 636 | |
637 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
638 | bgp_attr_extra_free (&attr); |
639 | ||
718e3744 | 640 | aspath_unintern (new->aspath); |
641 | return new; | |
642 | } | |
643 | ||
644 | /* Free bgp attribute and aspath. */ | |
645 | void | |
646 | bgp_attr_unintern (struct attr *attr) | |
647 | { | |
648 | struct attr *ret; | |
649 | struct aspath *aspath; | |
650 | struct community *community; | |
fb982c25 PJ |
651 | struct ecommunity *ecommunity = NULL; |
652 | struct cluster_list *cluster = NULL; | |
653 | struct transit *transit = NULL; | |
718e3744 | 654 | |
655 | /* Decrement attribute reference. */ | |
656 | attr->refcnt--; | |
657 | aspath = attr->aspath; | |
658 | community = attr->community; | |
fb982c25 PJ |
659 | if (attr->extra) |
660 | { | |
661 | ecommunity = attr->extra->ecommunity; | |
662 | cluster = attr->extra->cluster; | |
663 | transit = attr->extra->transit; | |
664 | } | |
718e3744 | 665 | |
666 | /* If reference becomes zero then free attribute object. */ | |
667 | if (attr->refcnt == 0) | |
668 | { | |
669 | ret = hash_release (attrhash, attr); | |
670 | assert (ret != NULL); | |
fb982c25 | 671 | bgp_attr_extra_free (attr); |
718e3744 | 672 | XFREE (MTYPE_ATTR, attr); |
673 | } | |
674 | ||
675 | /* aspath refcount shoud be decrement. */ | |
676 | if (aspath) | |
677 | aspath_unintern (aspath); | |
678 | if (community) | |
679 | community_unintern (community); | |
680 | if (ecommunity) | |
681 | ecommunity_unintern (ecommunity); | |
682 | if (cluster) | |
683 | cluster_unintern (cluster); | |
684 | if (transit) | |
685 | transit_unintern (transit); | |
686 | } | |
687 | ||
688 | void | |
689 | bgp_attr_flush (struct attr *attr) | |
690 | { | |
691 | if (attr->aspath && ! attr->aspath->refcnt) | |
692 | aspath_free (attr->aspath); | |
693 | if (attr->community && ! attr->community->refcnt) | |
694 | community_free (attr->community); | |
fb982c25 PJ |
695 | if (attr->extra) |
696 | { | |
697 | struct attr_extra *attre = attr->extra; | |
698 | if (attre->ecommunity && ! attre->ecommunity->refcnt) | |
699 | ecommunity_free (attre->ecommunity); | |
700 | if (attre->cluster && ! attre->cluster->refcnt) | |
701 | cluster_free (attre->cluster); | |
702 | if (attre->transit && ! attre->transit->refcnt) | |
703 | transit_free (attre->transit); | |
704 | } | |
718e3744 | 705 | } |
706 | ||
41367172 PJ |
707 | /* Parse AS_PATHLIMIT attribute in an UPDATE */ |
708 | static int | |
709 | bgp_attr_aspathlimit (struct peer *peer, bgp_size_t length, | |
710 | struct attr *attr, u_char flag, u_char *startp) | |
711 | { | |
712 | bgp_size_t total; | |
713 | ||
714 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
715 | ||
a15cfd16 PJ |
716 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) |
717 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) | |
41367172 PJ |
718 | { |
719 | zlog (peer->log, LOG_ERR, | |
720 | "AS-Pathlimit attribute flag isn't transitive %d", flag); | |
721 | bgp_notify_send_with_data (peer, | |
722 | BGP_NOTIFY_UPDATE_ERR, | |
723 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
724 | startp, total); | |
725 | return -1; | |
726 | } | |
727 | ||
728 | if (length != 5) | |
729 | { | |
730 | zlog (peer->log, LOG_ERR, | |
731 | "AS-Pathlimit length, %u, is not 5", length); | |
732 | bgp_notify_send_with_data (peer, | |
733 | BGP_NOTIFY_UPDATE_ERR, | |
734 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
735 | startp, total); | |
736 | return -1; | |
737 | } | |
738 | ||
739 | attr->pathlimit.ttl = stream_getc (BGP_INPUT(peer)); | |
740 | attr->pathlimit.as = stream_getl (BGP_INPUT(peer)); | |
741 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATHLIMIT); | |
742 | return 0; | |
743 | } | |
718e3744 | 744 | /* Get origin attribute of the update message. */ |
94f2b392 | 745 | static int |
718e3744 | 746 | bgp_attr_origin (struct peer *peer, bgp_size_t length, |
747 | struct attr *attr, u_char flag, u_char *startp) | |
748 | { | |
749 | bgp_size_t total; | |
750 | ||
751 | /* total is entire attribute length include Attribute Flags (1), | |
752 | Attribute Type code (1) and Attribute length (1 or 2). */ | |
753 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
754 | ||
755 | /* If any recognized attribute has Attribute Flags that conflict | |
756 | with the Attribute Type Code, then the Error Subcode is set to | |
757 | Attribute Flags Error. The Data field contains the erroneous | |
758 | attribute (type, length and value). */ | |
759 | if (flag != BGP_ATTR_FLAG_TRANS) | |
760 | { | |
761 | zlog (peer->log, LOG_ERR, | |
762 | "Origin attribute flag isn't transitive %d", flag); | |
763 | bgp_notify_send_with_data (peer, | |
764 | BGP_NOTIFY_UPDATE_ERR, | |
765 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
766 | startp, total); | |
767 | return -1; | |
768 | } | |
769 | ||
770 | /* If any recognized attribute has Attribute Length that conflicts | |
771 | with the expected length (based on the attribute type code), then | |
772 | the Error Subcode is set to Attribute Length Error. The Data | |
773 | field contains the erroneous attribute (type, length and | |
774 | value). */ | |
775 | if (length != 1) | |
776 | { | |
777 | zlog (peer->log, LOG_ERR, "Origin attribute length is not one %d", | |
778 | length); | |
779 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, | |
780 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
781 | startp, total); | |
782 | return -1; | |
783 | } | |
784 | ||
785 | /* Fetch origin attribute. */ | |
786 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
787 | ||
788 | /* If the ORIGIN attribute has an undefined value, then the Error | |
789 | Subcode is set to Invalid Origin Attribute. The Data field | |
790 | contains the unrecognized attribute (type, length and value). */ | |
791 | if ((attr->origin != BGP_ORIGIN_IGP) | |
792 | && (attr->origin != BGP_ORIGIN_EGP) | |
793 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
794 | { | |
795 | zlog (peer->log, LOG_ERR, "Origin attribute value is invalid %d", | |
796 | attr->origin); | |
797 | ||
798 | bgp_notify_send_with_data (peer, | |
799 | BGP_NOTIFY_UPDATE_ERR, | |
800 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
801 | startp, total); | |
802 | return -1; | |
803 | } | |
804 | ||
805 | /* Set oring attribute flag. */ | |
806 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
807 | ||
808 | return 0; | |
809 | } | |
cddb8112 CH |
810 | /* Parse AS path information. This function is wrapper of aspath_parse. |
811 | * | |
812 | * Parses AS_PATH or AS4_PATH. | |
813 | * | |
814 | * Returns: if valid: address of struct aspath in the hash of known aspaths, | |
815 | * with reference count incremented. | |
816 | * else: NULL | |
817 | * | |
818 | * NB: empty AS path (length == 0) is valid. The returned struct aspath will | |
819 | * have segments == NULL and str == zero length string (unique). | |
820 | */ | |
821 | static struct aspath * | |
718e3744 | 822 | bgp_attr_aspath (struct peer *peer, bgp_size_t length, |
cddb8112 | 823 | struct attr *attr, u_char flag, u_char *startp, int as4_path) |
718e3744 | 824 | { |
cddb8112 CH |
825 | u_char require ; |
826 | struct aspath *asp ; | |
718e3744 | 827 | |
cddb8112 CH |
828 | /* Check the attribute flags */ |
829 | require = as4_path ? BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
830 | : BGP_ATTR_FLAG_TRANS ; | |
718e3744 | 831 | |
cddb8112 | 832 | if ((flag & (BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS)) != require) |
718e3744 | 833 | { |
cddb8112 CH |
834 | const char* path_type ; |
835 | bgp_size_t total; | |
836 | ||
837 | path_type = as4_path ? "AS4_PATH" : "AS_PATH" ; | |
838 | ||
839 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
718e3744 | 840 | zlog (peer->log, LOG_ERR, |
cddb8112 CH |
841 | "%s attribute flag isn't transitive %d", path_type, flag) ; |
842 | ||
843 | if ((flag & BGP_ATTR_FLAG_OPTIONAL) != (require & BGP_ATTR_FLAG_OPTIONAL)) | |
844 | zlog (peer->log, LOG_ERR, | |
845 | "%s attribute flag must %sbe optional %d", path_type, | |
846 | (flag & BGP_ATTR_FLAG_OPTIONAL) ? "not " : "", flag) ; | |
847 | ||
848 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
849 | ||
718e3744 | 850 | bgp_notify_send_with_data (peer, |
851 | BGP_NOTIFY_UPDATE_ERR, | |
852 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
853 | startp, total); | |
718e3744 | 854 | |
cddb8112 CH |
855 | return NULL ; |
856 | } ; | |
857 | ||
858 | /* Parse the AS_PATH/AS4_PATH body. | |
859 | * | |
860 | * For AS_PATH peer with AS4 => 4Byte ASN otherwise 2Byte ASN | |
861 | * AS4_PATH 4Byte ASN | |
0b2aa3a0 | 862 | */ |
cddb8112 CH |
863 | asp = aspath_parse (peer->ibuf, length, |
864 | as4_path || CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV), as4_path) ; | |
0b2aa3a0 | 865 | |
cddb8112 CH |
866 | if (asp != NULL) |
867 | { | |
868 | attr->flag |= ATTR_FLAG_BIT (as4_path ? BGP_ATTR_AS4_PATH | |
869 | : BGP_ATTR_AS_PATH) ; | |
870 | } | |
871 | else | |
718e3744 | 872 | { |
873 | zlog (peer->log, LOG_ERR, "Malformed AS path length is %d", length); | |
cddb8112 CH |
874 | |
875 | /* TODO: should BGP_NOTIFY_UPDATE_MAL_AS_PATH be sent for AS4_PATH ?? */ | |
718e3744 | 876 | bgp_notify_send (peer, |
877 | BGP_NOTIFY_UPDATE_ERR, | |
878 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
cddb8112 | 879 | } ; |
0b2aa3a0 | 880 | |
cddb8112 | 881 | return asp ; |
0b2aa3a0 PJ |
882 | } |
883 | ||
884 | static int bgp_attr_aspath_check( struct peer *peer, | |
885 | struct attr *attr) | |
886 | { | |
887 | /* These checks were part of bgp_attr_aspath, but with | |
888 | * as4 we should to check aspath things when | |
889 | * aspath synthesizing with as4_path has already taken place. | |
890 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
891 | * not right. | |
892 | * So do the checks later, i.e. here | |
893 | */ | |
894 | struct bgp *bgp = peer->bgp; | |
895 | struct aspath *aspath; | |
896 | ||
718e3744 | 897 | bgp = peer->bgp; |
898 | ||
ca87e1d3 VT |
899 | /* Confederation sanity check. */ |
900 | if ((peer_sort (peer) == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) || | |
901 | (peer_sort (peer) == BGP_PEER_EBGP && aspath_confed_check (attr->aspath))) | |
902 | { | |
903 | zlog (peer->log, LOG_ERR, "Malformed AS path from %s", peer->host); | |
904 | bgp_notify_send (peer, | |
905 | BGP_NOTIFY_UPDATE_ERR, | |
906 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
907 | return -1; | |
908 | } | |
909 | ||
718e3744 | 910 | /* First AS check for EBGP. */ |
911 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
912 | { | |
913 | if (peer_sort (peer) == BGP_PEER_EBGP | |
914 | && ! aspath_firstas_check (attr->aspath, peer->as)) | |
915 | { | |
916 | zlog (peer->log, LOG_ERR, | |
aea339f7 | 917 | "%s incorrect first AS (must be %u)", peer->host, peer->as); |
718e3744 | 918 | bgp_notify_send (peer, |
919 | BGP_NOTIFY_UPDATE_ERR, | |
920 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
921 | return -1; | |
922 | } | |
923 | } | |
924 | ||
925 | /* local-as prepend */ | |
926 | if (peer->change_local_as && | |
927 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
928 | { | |
929 | aspath = aspath_dup (attr->aspath); | |
930 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
931 | aspath_unintern (attr->aspath); | |
932 | attr->aspath = aspath_intern (aspath); | |
933 | } | |
934 | ||
0b2aa3a0 PJ |
935 | return 0; |
936 | ||
937 | } | |
938 | ||
718e3744 | 939 | /* Nexthop attribute. */ |
94f2b392 | 940 | static int |
718e3744 | 941 | bgp_attr_nexthop (struct peer *peer, bgp_size_t length, |
942 | struct attr *attr, u_char flag, u_char *startp) | |
943 | { | |
944 | bgp_size_t total; | |
945 | ||
946 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
947 | ||
948 | /* Flag check. */ | |
949 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
950 | || ! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
951 | { | |
952 | zlog (peer->log, LOG_ERR, | |
953 | "Origin attribute flag isn't transitive %d", flag); | |
954 | bgp_notify_send_with_data (peer, | |
955 | BGP_NOTIFY_UPDATE_ERR, | |
956 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
957 | startp, total); | |
958 | return -1; | |
959 | } | |
960 | ||
961 | /* Check nexthop attribute length. */ | |
962 | if (length != 4) | |
963 | { | |
964 | zlog (peer->log, LOG_ERR, "Nexthop attribute length isn't four [%d]", | |
965 | length); | |
966 | ||
967 | bgp_notify_send_with_data (peer, | |
968 | BGP_NOTIFY_UPDATE_ERR, | |
969 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
970 | startp, total); | |
971 | return -1; | |
972 | } | |
973 | ||
974 | attr->nexthop.s_addr = stream_get_ipv4 (peer->ibuf); | |
975 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
976 | ||
977 | return 0; | |
978 | } | |
979 | ||
980 | /* MED atrribute. */ | |
94f2b392 | 981 | static int |
718e3744 | 982 | bgp_attr_med (struct peer *peer, bgp_size_t length, |
983 | struct attr *attr, u_char flag, u_char *startp) | |
984 | { | |
985 | bgp_size_t total; | |
986 | ||
987 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
988 | ||
989 | /* Length check. */ | |
990 | if (length != 4) | |
991 | { | |
992 | zlog (peer->log, LOG_ERR, | |
993 | "MED attribute length isn't four [%d]", length); | |
994 | ||
995 | bgp_notify_send_with_data (peer, | |
996 | BGP_NOTIFY_UPDATE_ERR, | |
997 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
998 | startp, total); | |
999 | return -1; | |
1000 | } | |
1001 | ||
1002 | attr->med = stream_getl (peer->ibuf); | |
1003 | ||
1004 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | /* Local preference attribute. */ | |
94f2b392 | 1010 | static int |
718e3744 | 1011 | bgp_attr_local_pref (struct peer *peer, bgp_size_t length, |
1012 | struct attr *attr, u_char flag) | |
1013 | { | |
1014 | /* If it is contained in an UPDATE message that is received from an | |
1015 | external peer, then this attribute MUST be ignored by the | |
1016 | receiving speaker. */ | |
1017 | if (peer_sort (peer) == BGP_PEER_EBGP) | |
1018 | { | |
9985f83c | 1019 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1020 | return 0; |
1021 | } | |
1022 | ||
1023 | if (length == 4) | |
1024 | attr->local_pref = stream_getl (peer->ibuf); | |
1025 | else | |
1026 | attr->local_pref = 0; | |
1027 | ||
1028 | /* Set atomic aggregate flag. */ | |
1029 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
1030 | ||
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | /* Atomic aggregate. */ | |
94f2b392 | 1035 | static int |
718e3744 | 1036 | bgp_attr_atomic (struct peer *peer, bgp_size_t length, |
1037 | struct attr *attr, u_char flag) | |
1038 | { | |
1039 | if (length != 0) | |
1040 | { | |
1041 | zlog (peer->log, LOG_ERR, "Bad atomic aggregate length %d", length); | |
1042 | ||
1043 | bgp_notify_send (peer, | |
1044 | BGP_NOTIFY_UPDATE_ERR, | |
1045 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1046 | return -1; | |
1047 | } | |
1048 | ||
1049 | /* Set atomic aggregate flag. */ | |
1050 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* Aggregator attribute */ | |
94f2b392 | 1056 | static int |
718e3744 | 1057 | bgp_attr_aggregator (struct peer *peer, bgp_size_t length, |
1058 | struct attr *attr, u_char flag) | |
1059 | { | |
0b2aa3a0 | 1060 | int wantedlen = 6; |
fb982c25 PJ |
1061 | struct attr_extra *attre = bgp_attr_extra_get (attr); |
1062 | ||
0b2aa3a0 PJ |
1063 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ |
1064 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
1065 | wantedlen = 8; | |
1066 | ||
1067 | if (length != wantedlen) | |
718e3744 | 1068 | { |
0b2aa3a0 | 1069 | zlog (peer->log, LOG_ERR, "Aggregator length is not %d [%d]", wantedlen, length); |
718e3744 | 1070 | |
1071 | bgp_notify_send (peer, | |
1072 | BGP_NOTIFY_UPDATE_ERR, | |
1073 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1074 | return -1; | |
1075 | } | |
0b2aa3a0 PJ |
1076 | |
1077 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
1078 | attre->aggregator_as = stream_getl (peer->ibuf); | |
1079 | else | |
1080 | attre->aggregator_as = stream_getw (peer->ibuf); | |
fb982c25 | 1081 | attre->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); |
718e3744 | 1082 | |
1083 | /* Set atomic aggregate flag. */ | |
1084 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1085 | ||
1086 | return 0; | |
1087 | } | |
1088 | ||
0b2aa3a0 PJ |
1089 | /* New Aggregator attribute */ |
1090 | static int | |
1091 | bgp_attr_as4_aggregator (struct peer *peer, bgp_size_t length, | |
1092 | struct attr *attr, as_t *as4_aggregator_as, | |
1093 | struct in_addr *as4_aggregator_addr) | |
1094 | { | |
1095 | if (length != 8) | |
1096 | { | |
1097 | zlog (peer->log, LOG_ERR, "New Aggregator length is not 8 [%d]", length); | |
1098 | ||
1099 | bgp_notify_send (peer, | |
1100 | BGP_NOTIFY_UPDATE_ERR, | |
1101 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1102 | return -1; | |
1103 | } | |
1104 | *as4_aggregator_as = stream_getl (peer->ibuf); | |
1105 | as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf); | |
1106 | ||
1107 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR); | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1113 | */ | |
1114 | static int | |
1115 | bgp_attr_munge_as4_attrs (struct peer *peer, struct attr *attr, | |
1116 | struct aspath *as4_path, as_t as4_aggregator, | |
1117 | struct in_addr *as4_aggregator_addr) | |
1118 | { | |
1119 | int ignore_as4_path = 0; | |
1120 | struct aspath *newpath; | |
1121 | struct attr_extra *attre = attr->extra; | |
1122 | ||
1123 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV) ) | |
1124 | { | |
1125 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1126 | * if given. | |
1127 | * It is worth a warning though, because the peer really | |
1128 | * should not send them | |
1129 | */ | |
1130 | if (BGP_DEBUG(as4, AS4)) | |
1131 | { | |
1132 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1133 | zlog_debug ("[AS4] %s %s AS4_PATH", | |
1134 | peer->host, "AS4 capable peer, yet it sent"); | |
1135 | ||
1136 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1137 | zlog_debug ("[AS4] %s %s AS4_AGGREGATOR", | |
1138 | peer->host, "AS4 capable peer, yet it sent"); | |
1139 | } | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | if (attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH)) | |
1145 | && !(attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS_PATH)))) | |
1146 | { | |
1147 | /* Hu? This is not supposed to happen at all! | |
1148 | * got as4_path and no aspath, | |
1149 | * This should already | |
1150 | * have been handled by 'well known attributes missing' | |
1151 | * But... yeah, paranoia | |
1152 | * Take this as a "malformed attribute" | |
1153 | */ | |
1154 | zlog (peer->log, LOG_ERR, | |
1155 | "%s BGP not AS4 capable peer sent AS4_PATH but" | |
1156 | " no AS_PATH, cant do anything here", peer->host); | |
1157 | bgp_notify_send (peer, | |
1158 | BGP_NOTIFY_UPDATE_ERR, | |
1159 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1160 | return -1; | |
1161 | } | |
1162 | ||
1163 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1164 | * because that may override AS4_PATH | |
1165 | */ | |
1166 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) ) | |
1167 | { | |
0b2aa3a0 PJ |
1168 | if ( attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) ) |
1169 | { | |
370b64a2 PJ |
1170 | assert (attre); |
1171 | ||
0b2aa3a0 PJ |
1172 | /* received both. |
1173 | * if the as_number in aggregator is not AS_TRANS, | |
1174 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1175 | * and the Aggregator shall be taken as | |
1176 | * info on the aggregating node, and the AS_PATH | |
1177 | * shall be taken as the AS_PATH | |
1178 | * otherwise | |
1179 | * the Aggregator shall be ignored and the | |
1180 | * AS4_AGGREGATOR shall be taken as the | |
1181 | * Aggregating node and the AS_PATH is to be | |
1182 | * constructed "as in all other cases" | |
1183 | */ | |
1184 | if ( attre->aggregator_as != BGP_AS_TRANS ) | |
1185 | { | |
1186 | /* ignore */ | |
1187 | if ( BGP_DEBUG(as4, AS4)) | |
1188 | zlog_debug ("[AS4] %s BGP not AS4 capable peer" | |
1189 | " send AGGREGATOR != AS_TRANS and" | |
1190 | " AS4_AGGREGATOR, so ignore" | |
1191 | " AS4_AGGREGATOR and AS4_PATH", peer->host); | |
1192 | ignore_as4_path = 1; | |
1193 | } | |
1194 | else | |
1195 | { | |
1196 | /* "New_aggregator shall be taken as aggregator" */ | |
1197 | attre->aggregator_as = as4_aggregator; | |
1198 | attre->aggregator_addr.s_addr = as4_aggregator_addr->s_addr; | |
1199 | } | |
1200 | } | |
1201 | else | |
1202 | { | |
1203 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1204 | * That is bogus - but reading the conditions | |
1205 | * we have to handle AS4_AGGREGATOR as if it were | |
1206 | * AGGREGATOR in that case | |
1207 | */ | |
1208 | if ( BGP_DEBUG(as4, AS4)) | |
1209 | zlog_debug ("[AS4] %s BGP not AS4 capable peer send" | |
1210 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1211 | " it as if AGGREGATOR with AS_TRANS had been there", peer->host); | |
370b64a2 | 1212 | (attre = bgp_attr_extra_get (attr))->aggregator_as = as4_aggregator; |
0b2aa3a0 PJ |
1213 | /* sweep it under the carpet and simulate a "good" AGGREGATOR */ |
1214 | attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)); | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1219 | if ( !ignore_as4_path && (attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH))) ) | |
1220 | { | |
1221 | newpath = aspath_reconcile_as4 (attr->aspath, as4_path); | |
1222 | aspath_unintern (attr->aspath); | |
1223 | attr->aspath = aspath_intern (newpath); | |
1224 | } | |
1225 | return 0; | |
1226 | } | |
1227 | ||
718e3744 | 1228 | /* Community attribute. */ |
94f2b392 | 1229 | static int |
718e3744 | 1230 | bgp_attr_community (struct peer *peer, bgp_size_t length, |
1231 | struct attr *attr, u_char flag) | |
1232 | { | |
1233 | if (length == 0) | |
b2ceea18 PJ |
1234 | { |
1235 | attr->community = NULL; | |
1236 | return 0; | |
1237 | } | |
718e3744 | 1238 | else |
1239 | { | |
5228ad27 | 1240 | attr->community = |
1241 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
9985f83c | 1242 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1243 | } |
1244 | ||
1245 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
1246 | ||
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | /* Originator ID attribute. */ | |
94f2b392 | 1251 | static int |
718e3744 | 1252 | bgp_attr_originator_id (struct peer *peer, bgp_size_t length, |
1253 | struct attr *attr, u_char flag) | |
1254 | { | |
1255 | if (length != 4) | |
1256 | { | |
1257 | zlog (peer->log, LOG_ERR, "Bad originator ID length %d", length); | |
1258 | ||
1259 | bgp_notify_send (peer, | |
1260 | BGP_NOTIFY_UPDATE_ERR, | |
1261 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1262 | return -1; | |
1263 | } | |
1264 | ||
fb982c25 PJ |
1265 | (bgp_attr_extra_get (attr))->originator_id.s_addr |
1266 | = stream_get_ipv4 (peer->ibuf); | |
718e3744 | 1267 | |
1268 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | /* Cluster list attribute. */ | |
94f2b392 | 1274 | static int |
718e3744 | 1275 | bgp_attr_cluster_list (struct peer *peer, bgp_size_t length, |
1276 | struct attr *attr, u_char flag) | |
1277 | { | |
1278 | /* Check length. */ | |
1279 | if (length % 4) | |
1280 | { | |
1281 | zlog (peer->log, LOG_ERR, "Bad cluster list length %d", length); | |
1282 | ||
1283 | bgp_notify_send (peer, | |
1284 | BGP_NOTIFY_UPDATE_ERR, | |
1285 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1286 | return -1; | |
1287 | } | |
1288 | ||
fb982c25 PJ |
1289 | (bgp_attr_extra_get (attr))->cluster |
1290 | = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length); | |
718e3744 | 1291 | |
9985f83c | 1292 | stream_forward_getp (peer->ibuf, length);; |
718e3744 | 1293 | |
1294 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | /* Multiprotocol reachability information parse. */ | |
03292809 | 1300 | int |
718e3744 | 1301 | bgp_mp_reach_parse (struct peer *peer, bgp_size_t length, struct attr *attr, |
1302 | struct bgp_nlri *mp_update) | |
1303 | { | |
4c9641ba ML |
1304 | afi_t afi; |
1305 | safi_t safi; | |
718e3744 | 1306 | bgp_size_t nlri_len; |
6e4ab12f | 1307 | size_t start; |
718e3744 | 1308 | int ret; |
1309 | struct stream *s; | |
fb982c25 | 1310 | struct attr_extra *attre = bgp_attr_extra_get(attr); |
718e3744 | 1311 | |
1312 | /* Set end of packet. */ | |
6e4ab12f PJ |
1313 | s = BGP_INPUT(peer); |
1314 | start = stream_get_getp(s); | |
1315 | ||
1316 | /* safe to read statically sized header? */ | |
1317 | #define BGP_MP_REACH_MIN_SIZE 5 | |
03292809 | 1318 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
6e4ab12f | 1319 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) |
03292809 PJ |
1320 | { |
1321 | zlog_info ("%s: %s sent invalid length, %lu", | |
1322 | __func__, peer->host, (unsigned long)length); | |
1323 | return -1; | |
1324 | } | |
6e4ab12f | 1325 | |
718e3744 | 1326 | /* Load AFI, SAFI. */ |
1327 | afi = stream_getw (s); | |
1328 | safi = stream_getc (s); | |
1329 | ||
1330 | /* Get nexthop length. */ | |
fb982c25 | 1331 | attre->mp_nexthop_len = stream_getc (s); |
6e4ab12f | 1332 | |
03292809 PJ |
1333 | if (LEN_LEFT < attre->mp_nexthop_len) |
1334 | { | |
1335 | zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1336 | __func__, peer->host, attre->mp_nexthop_len); | |
1337 | return -1; | |
1338 | } | |
6e4ab12f | 1339 | |
718e3744 | 1340 | /* Nexthop length check. */ |
fb982c25 | 1341 | switch (attre->mp_nexthop_len) |
718e3744 | 1342 | { |
1343 | case 4: | |
fb982c25 | 1344 | stream_get (&attre->mp_nexthop_global_in, s, 4); |
66bed4f4 ML |
1345 | /* Probably needed for RFC 2283 */ |
1346 | if (attr->nexthop.s_addr == 0) | |
1347 | memcpy(&attr->nexthop.s_addr, &attre->mp_nexthop_global_in, 4); | |
718e3744 | 1348 | break; |
1349 | case 12: | |
1350 | { | |
1351 | u_int32_t rd_high; | |
1352 | u_int32_t rd_low; | |
1353 | ||
1354 | rd_high = stream_getl (s); | |
1355 | rd_low = stream_getl (s); | |
fb982c25 | 1356 | stream_get (&attre->mp_nexthop_global_in, s, 4); |
718e3744 | 1357 | } |
1358 | break; | |
1359 | #ifdef HAVE_IPV6 | |
1360 | case 16: | |
fb982c25 | 1361 | stream_get (&attre->mp_nexthop_global, s, 16); |
718e3744 | 1362 | break; |
1363 | case 32: | |
fb982c25 PJ |
1364 | stream_get (&attre->mp_nexthop_global, s, 16); |
1365 | stream_get (&attre->mp_nexthop_local, s, 16); | |
1366 | if (! IN6_IS_ADDR_LINKLOCAL (&attre->mp_nexthop_local)) | |
718e3744 | 1367 | { |
1368 | char buf1[INET6_ADDRSTRLEN]; | |
1369 | char buf2[INET6_ADDRSTRLEN]; | |
1370 | ||
1371 | if (BGP_DEBUG (update, UPDATE_IN)) | |
557865c2 | 1372 | zlog_debug ("%s got two nexthop %s %s but second one is not a link-local nexthop", peer->host, |
fb982c25 | 1373 | inet_ntop (AF_INET6, &attre->mp_nexthop_global, |
718e3744 | 1374 | buf1, INET6_ADDRSTRLEN), |
fb982c25 | 1375 | inet_ntop (AF_INET6, &attre->mp_nexthop_local, |
718e3744 | 1376 | buf2, INET6_ADDRSTRLEN)); |
1377 | ||
fb982c25 | 1378 | attre->mp_nexthop_len = 16; |
718e3744 | 1379 | } |
1380 | break; | |
1381 | #endif /* HAVE_IPV6 */ | |
1382 | default: | |
03292809 PJ |
1383 | zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d", |
1384 | __func__, peer->host, attre->mp_nexthop_len); | |
718e3744 | 1385 | return -1; |
718e3744 | 1386 | } |
1387 | ||
03292809 PJ |
1388 | if (!LEN_LEFT) |
1389 | { | |
1390 | zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)", | |
1391 | __func__, peer->host); | |
1392 | return -1; | |
1393 | } | |
718e3744 | 1394 | |
6e4ab12f PJ |
1395 | { |
1396 | u_char val; | |
1397 | if ((val = stream_getc (s))) | |
1398 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
1399 | peer->host, val); | |
1400 | } | |
1401 | ||
1402 | /* must have nrli_len, what is left of the attribute */ | |
03292809 | 1403 | nlri_len = LEN_LEFT; |
6e4ab12f | 1404 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) |
03292809 PJ |
1405 | { |
1406 | zlog_info ("%s: (%s) Failed to read NLRI", | |
1407 | __func__, peer->host); | |
1408 | return -1; | |
1409 | } | |
718e3744 | 1410 | |
1411 | if (safi != BGP_SAFI_VPNV4) | |
1412 | { | |
1413 | ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), nlri_len); | |
03292809 PJ |
1414 | if (ret < 0) |
1415 | { | |
1416 | zlog_info ("%s: (%s) NLRI doesn't pass sanity check", | |
1417 | __func__, peer->host); | |
1418 | return -1; | |
1419 | } | |
718e3744 | 1420 | } |
1421 | ||
1422 | mp_update->afi = afi; | |
1423 | mp_update->safi = safi; | |
1424 | mp_update->nlri = stream_pnt (s); | |
1425 | mp_update->length = nlri_len; | |
1426 | ||
9985f83c | 1427 | stream_forward_getp (s, nlri_len); |
718e3744 | 1428 | |
1429 | return 0; | |
03292809 | 1430 | #undef LEN_LEFT |
718e3744 | 1431 | } |
1432 | ||
1433 | /* Multiprotocol unreachable parse */ | |
03292809 | 1434 | int |
6e4ab12f | 1435 | bgp_mp_unreach_parse (struct peer *peer, bgp_size_t length, |
718e3744 | 1436 | struct bgp_nlri *mp_withdraw) |
1437 | { | |
1438 | struct stream *s; | |
4c9641ba ML |
1439 | afi_t afi; |
1440 | safi_t safi; | |
718e3744 | 1441 | u_int16_t withdraw_len; |
1442 | int ret; | |
1443 | ||
1444 | s = peer->ibuf; | |
6e4ab12f PJ |
1445 | |
1446 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
1447 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1448 | return -1; | |
1449 | ||
718e3744 | 1450 | afi = stream_getw (s); |
1451 | safi = stream_getc (s); | |
6e4ab12f PJ |
1452 | |
1453 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; | |
718e3744 | 1454 | |
1455 | if (safi != BGP_SAFI_VPNV4) | |
1456 | { | |
1457 | ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), withdraw_len); | |
1458 | if (ret < 0) | |
1459 | return -1; | |
1460 | } | |
1461 | ||
1462 | mp_withdraw->afi = afi; | |
1463 | mp_withdraw->safi = safi; | |
1464 | mp_withdraw->nlri = stream_pnt (s); | |
1465 | mp_withdraw->length = withdraw_len; | |
1466 | ||
9985f83c | 1467 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1468 | |
1469 | return 0; | |
1470 | } | |
1471 | ||
1472 | /* Extended Community attribute. */ | |
94f2b392 | 1473 | static int |
718e3744 | 1474 | bgp_attr_ext_communities (struct peer *peer, bgp_size_t length, |
1475 | struct attr *attr, u_char flag) | |
1476 | { | |
1477 | if (length == 0) | |
fb982c25 PJ |
1478 | { |
1479 | if (attr->extra) | |
1480 | attr->extra->ecommunity = NULL; | |
1481 | } | |
718e3744 | 1482 | else |
1483 | { | |
fb982c25 | 1484 | (bgp_attr_extra_get (attr))->ecommunity = |
5228ad27 | 1485 | ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); |
9985f83c | 1486 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1487 | } |
1488 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); | |
1489 | ||
1490 | return 0; | |
1491 | } | |
1492 | ||
1493 | /* BGP unknown attribute treatment. */ | |
94f2b392 | 1494 | static int |
718e3744 | 1495 | bgp_attr_unknown (struct peer *peer, struct attr *attr, u_char flag, |
1496 | u_char type, bgp_size_t length, u_char *startp) | |
1497 | { | |
1498 | bgp_size_t total; | |
1499 | struct transit *transit; | |
fb982c25 | 1500 | struct attr_extra *attre; |
718e3744 | 1501 | |
f418446b | 1502 | if (BGP_DEBUG (normal, NORMAL)) |
1503 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", | |
1504 | peer->host, type, length); | |
1505 | ||
718e3744 | 1506 | if (BGP_DEBUG (events, EVENTS)) |
557865c2 | 1507 | zlog (peer->log, LOG_DEBUG, |
718e3744 | 1508 | "Unknown attribute type %d length %d is received", type, length); |
1509 | ||
1510 | /* Forward read pointer of input stream. */ | |
9985f83c | 1511 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1512 | |
1513 | /* Adjest total length to include type and length. */ | |
1514 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1515 | ||
1516 | /* If any of the mandatory well-known attributes are not recognized, | |
1517 | then the Error Subcode is set to Unrecognized Well-known | |
1518 | Attribute. The Data field contains the unrecognized attribute | |
1519 | (type, length and value). */ | |
1520 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) | |
1521 | { | |
1522 | /* Adjust startp to do not include flag value. */ | |
1523 | bgp_notify_send_with_data (peer, | |
1524 | BGP_NOTIFY_UPDATE_ERR, | |
1525 | BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
1526 | startp, total); | |
1527 | return -1; | |
1528 | } | |
1529 | ||
1530 | /* Unrecognized non-transitive optional attributes must be quietly | |
1531 | ignored and not passed along to other BGP peers. */ | |
1532 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
1533 | return 0; | |
1534 | ||
1535 | /* If a path with recognized transitive optional attribute is | |
1536 | accepted and passed along to other BGP peers and the Partial bit | |
1537 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
1538 | is not set back to 0 by the current AS. */ | |
1539 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
1540 | ||
1541 | /* Store transitive attribute to the end of attr->transit. */ | |
fb982c25 | 1542 | if (! ((attre = bgp_attr_extra_get(attr))->transit) ) |
393deb9b | 1543 | attre->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); |
718e3744 | 1544 | |
fb982c25 | 1545 | transit = attre->transit; |
718e3744 | 1546 | |
1547 | if (transit->val) | |
1548 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
1549 | transit->length + total); | |
1550 | else | |
1551 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
1552 | ||
1553 | memcpy (transit->val + transit->length, startp, total); | |
1554 | transit->length += total; | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /* Read attribute of update packet. This function is called from | |
1560 | bgp_update() in bgpd.c. */ | |
1561 | int | |
1562 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, | |
1563 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) | |
1564 | { | |
1565 | int ret; | |
1566 | u_char flag; | |
0b2aa3a0 | 1567 | u_char type = 0; |
718e3744 | 1568 | bgp_size_t length; |
1569 | u_char *startp, *endp; | |
1570 | u_char *attr_endp; | |
1571 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
0b2aa3a0 PJ |
1572 | /* we need the as4_path only until we have synthesized the as_path with it */ |
1573 | /* same goes for as4_aggregator */ | |
1574 | struct aspath *as4_path = NULL; | |
1575 | as_t as4_aggregator = 0; | |
1576 | struct in_addr as4_aggregator_addr = { 0 }; | |
718e3744 | 1577 | |
1578 | /* Initialize bitmap. */ | |
1579 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
1580 | ||
1581 | /* End pointer of BGP attribute. */ | |
1582 | endp = BGP_INPUT_PNT (peer) + size; | |
1583 | ||
1584 | /* Get attributes to the end of attribute length. */ | |
1585 | while (BGP_INPUT_PNT (peer) < endp) | |
1586 | { | |
1587 | /* Check remaining length check.*/ | |
1588 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
1589 | { | |
c29fdba7 | 1590 | /* XXX warning: long int format, int arg (arg 5) */ |
718e3744 | 1591 | zlog (peer->log, LOG_WARNING, |
41367172 | 1592 | "%s error BGP attribute length %lu is smaller than min len", |
0b2aa3a0 PJ |
1593 | peer->host, |
1594 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
718e3744 | 1595 | |
1596 | bgp_notify_send (peer, | |
1597 | BGP_NOTIFY_UPDATE_ERR, | |
1598 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1599 | return -1; | |
1600 | } | |
1601 | ||
1602 | /* Fetch attribute flag and type. */ | |
1603 | startp = BGP_INPUT_PNT (peer); | |
1604 | flag = stream_getc (BGP_INPUT (peer)); | |
1605 | type = stream_getc (BGP_INPUT (peer)); | |
1606 | ||
370b64a2 PJ |
1607 | /* Check whether Extended-Length applies and is in bounds */ |
1608 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) | |
1609 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) | |
1610 | { | |
1611 | zlog (peer->log, LOG_WARNING, | |
851a1a5c | 1612 | "%s Extended length set, but just %lu bytes of attr header", |
370b64a2 PJ |
1613 | peer->host, |
1614 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
1615 | ||
1616 | bgp_notify_send (peer, | |
1617 | BGP_NOTIFY_UPDATE_ERR, | |
1618 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1619 | return -1; | |
1620 | } | |
1621 | ||
718e3744 | 1622 | /* Check extended attribue length bit. */ |
1623 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
1624 | length = stream_getw (BGP_INPUT (peer)); | |
1625 | else | |
1626 | length = stream_getc (BGP_INPUT (peer)); | |
1627 | ||
1628 | /* If any attribute appears more than once in the UPDATE | |
1629 | message, then the Error Subcode is set to Malformed Attribute | |
1630 | List. */ | |
1631 | ||
1632 | if (CHECK_BITMAP (seen, type)) | |
1633 | { | |
1634 | zlog (peer->log, LOG_WARNING, | |
1635 | "%s error BGP attribute type %d appears twice in a message", | |
1636 | peer->host, type); | |
1637 | ||
1638 | bgp_notify_send (peer, | |
1639 | BGP_NOTIFY_UPDATE_ERR, | |
1640 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1641 | return -1; | |
1642 | } | |
1643 | ||
1644 | /* Set type to bitmap to check duplicate attribute. `type' is | |
1645 | unsigned char so it never overflow bitmap range. */ | |
1646 | ||
1647 | SET_BITMAP (seen, type); | |
1648 | ||
1649 | /* Overflow check. */ | |
1650 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
1651 | ||
1652 | if (attr_endp > endp) | |
1653 | { | |
1654 | zlog (peer->log, LOG_WARNING, | |
1655 | "%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); | |
1656 | bgp_notify_send (peer, | |
1657 | BGP_NOTIFY_UPDATE_ERR, | |
1658 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1659 | return -1; | |
1660 | } | |
1661 | ||
1662 | /* OK check attribute and store it's value. */ | |
1663 | switch (type) | |
1664 | { | |
1665 | case BGP_ATTR_ORIGIN: | |
1666 | ret = bgp_attr_origin (peer, length, attr, flag, startp); | |
1667 | break; | |
1668 | case BGP_ATTR_AS_PATH: | |
cddb8112 CH |
1669 | attr->aspath = bgp_attr_aspath (peer, length, attr, flag, startp, 0); |
1670 | ret = attr->aspath ? 0 : -1 ; | |
718e3744 | 1671 | break; |
0b2aa3a0 | 1672 | case BGP_ATTR_AS4_PATH: |
cddb8112 CH |
1673 | as4_path = bgp_attr_aspath (peer, length, attr, flag, startp, 1); |
1674 | ret = as4_path ? 0 : -1 ; | |
0b2aa3a0 | 1675 | break; |
718e3744 | 1676 | case BGP_ATTR_NEXT_HOP: |
1677 | ret = bgp_attr_nexthop (peer, length, attr, flag, startp); | |
1678 | break; | |
1679 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1680 | ret = bgp_attr_med (peer, length, attr, flag, startp); | |
1681 | break; | |
1682 | case BGP_ATTR_LOCAL_PREF: | |
1683 | ret = bgp_attr_local_pref (peer, length, attr, flag); | |
1684 | break; | |
1685 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1686 | ret = bgp_attr_atomic (peer, length, attr, flag); | |
1687 | break; | |
1688 | case BGP_ATTR_AGGREGATOR: | |
1689 | ret = bgp_attr_aggregator (peer, length, attr, flag); | |
1690 | break; | |
0b2aa3a0 PJ |
1691 | case BGP_ATTR_AS4_AGGREGATOR: |
1692 | ret = bgp_attr_as4_aggregator (peer, length, attr, &as4_aggregator, &as4_aggregator_addr); | |
1693 | break; | |
718e3744 | 1694 | case BGP_ATTR_COMMUNITIES: |
1695 | ret = bgp_attr_community (peer, length, attr, flag); | |
1696 | break; | |
1697 | case BGP_ATTR_ORIGINATOR_ID: | |
1698 | ret = bgp_attr_originator_id (peer, length, attr, flag); | |
1699 | break; | |
1700 | case BGP_ATTR_CLUSTER_LIST: | |
1701 | ret = bgp_attr_cluster_list (peer, length, attr, flag); | |
1702 | break; | |
1703 | case BGP_ATTR_MP_REACH_NLRI: | |
1704 | ret = bgp_mp_reach_parse (peer, length, attr, mp_update); | |
1705 | break; | |
1706 | case BGP_ATTR_MP_UNREACH_NLRI: | |
1707 | ret = bgp_mp_unreach_parse (peer, length, mp_withdraw); | |
1708 | break; | |
1709 | case BGP_ATTR_EXT_COMMUNITIES: | |
1710 | ret = bgp_attr_ext_communities (peer, length, attr, flag); | |
1711 | break; | |
41367172 PJ |
1712 | case BGP_ATTR_AS_PATHLIMIT: |
1713 | ret = bgp_attr_aspathlimit (peer, length, attr, flag, startp); | |
1714 | break; | |
718e3744 | 1715 | default: |
1716 | ret = bgp_attr_unknown (peer, attr, flag, type, length, startp); | |
1717 | break; | |
1718 | } | |
1719 | ||
1720 | /* If error occured immediately return to the caller. */ | |
1721 | if (ret < 0) | |
6e4ab12f PJ |
1722 | { |
1723 | zlog (peer->log, LOG_WARNING, | |
1724 | "%s: Attribute %s, parse error", | |
1725 | peer->host, | |
1726 | LOOKUP (attr_str, type)); | |
1727 | bgp_notify_send (peer, | |
1728 | BGP_NOTIFY_UPDATE_ERR, | |
1729 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1730 | return ret; | |
1731 | } | |
718e3744 | 1732 | |
1733 | /* Check the fetched length. */ | |
1734 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
1735 | { | |
1736 | zlog (peer->log, LOG_WARNING, | |
6e4ab12f PJ |
1737 | "%s: BGP attribute %s, fetch error", |
1738 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 1739 | bgp_notify_send (peer, |
1740 | BGP_NOTIFY_UPDATE_ERR, | |
1741 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1742 | return -1; | |
1743 | } | |
1744 | } | |
1745 | ||
1746 | /* Check final read pointer is same as end pointer. */ | |
1747 | if (BGP_INPUT_PNT (peer) != endp) | |
1748 | { | |
1749 | zlog (peer->log, LOG_WARNING, | |
6e4ab12f PJ |
1750 | "%s BGP attribute %s, length mismatch", |
1751 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 1752 | bgp_notify_send (peer, |
1753 | BGP_NOTIFY_UPDATE_ERR, | |
1754 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
1755 | return -1; | |
1756 | } | |
1757 | ||
0b2aa3a0 PJ |
1758 | /* |
1759 | * At this place we can see whether we got AS4_PATH and/or | |
1760 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
1761 | * We can not do this before we've read all attributes because | |
1762 | * the as4 handling does not say whether AS4_PATH has to be sent | |
1763 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
1764 | * in relationship to AGGREGATOR. | |
1765 | * So, to be defensive, we are not relying on any order and read | |
1766 | * all attributes first, including these 32bit ones, and now, | |
1767 | * afterwards, we look what and if something is to be done for as4. | |
1768 | */ | |
1769 | if (bgp_attr_munge_as4_attrs (peer, attr, as4_path, | |
1770 | as4_aggregator, &as4_aggregator_addr)) | |
1771 | return -1; | |
1772 | ||
1773 | /* At this stage, we have done all fiddling with as4, and the | |
1774 | * resulting info is in attr->aggregator resp. attr->aspath | |
1775 | * so we can chuck as4_aggregator and as4_path alltogether in | |
1776 | * order to save memory | |
1777 | */ | |
1778 | if ( as4_path ) | |
1779 | { | |
1780 | aspath_unintern( as4_path ); /* unintern - it is in the hash */ | |
1781 | as4_path = NULL; | |
1782 | /* The flag that we got this is still there, but that does not | |
1783 | * do any trouble | |
1784 | */ | |
1785 | } | |
1786 | /* | |
1787 | * The "rest" of the code does nothing with as4_aggregator. | |
1788 | * there is no memory attached specifically which is not part | |
1789 | * of the attr. | |
1790 | * so ignoring just means do nothing. | |
1791 | */ | |
1792 | /* | |
1793 | * Finally do the checks on the aspath we did not do yet | |
1794 | * because we waited for a potentially synthesized aspath. | |
1795 | */ | |
1796 | if ( attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS_PATH))) | |
1797 | { | |
1798 | ret = bgp_attr_aspath_check( peer, attr ); | |
1799 | if ( ret < 0 ) | |
1800 | return ret; | |
1801 | } | |
1802 | ||
718e3744 | 1803 | /* Finally intern unknown attribute. */ |
fb982c25 PJ |
1804 | if (attr->extra && attr->extra->transit) |
1805 | attr->extra->transit = transit_intern (attr->extra->transit); | |
718e3744 | 1806 | |
1807 | return 0; | |
1808 | } | |
1809 | ||
1810 | /* Well-known attribute check. */ | |
1811 | int | |
1812 | bgp_attr_check (struct peer *peer, struct attr *attr) | |
1813 | { | |
1814 | u_char type = 0; | |
1815 | ||
1816 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) | |
1817 | type = BGP_ATTR_ORIGIN; | |
1818 | ||
1819 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
1820 | type = BGP_ATTR_AS_PATH; | |
1821 | ||
1822 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP))) | |
1823 | type = BGP_ATTR_NEXT_HOP; | |
1824 | ||
1825 | if (peer_sort (peer) == BGP_PEER_IBGP | |
1826 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) | |
1827 | type = BGP_ATTR_LOCAL_PREF; | |
1828 | ||
1829 | if (type) | |
1830 | { | |
1831 | zlog (peer->log, LOG_WARNING, | |
1832 | "%s Missing well-known attribute %d.", | |
1833 | peer->host, type); | |
1834 | bgp_notify_send_with_data (peer, | |
1835 | BGP_NOTIFY_UPDATE_ERR, | |
1836 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
1837 | &type, 1); | |
1838 | return -1; | |
1839 | } | |
1840 | return 0; | |
1841 | } | |
1842 | \f | |
1843 | int stream_put_prefix (struct stream *, struct prefix *); | |
1844 | ||
1845 | /* Make attribute packet. */ | |
1846 | bgp_size_t | |
1847 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
1848 | struct stream *s, struct attr *attr, struct prefix *p, | |
1849 | afi_t afi, safi_t safi, struct peer *from, | |
a3b6ea56 | 1850 | struct prefix_rd *prd, u_char *tag) |
718e3744 | 1851 | { |
fe69a505 | 1852 | size_t cp; |
0b2aa3a0 | 1853 | size_t aspath_sizep; |
718e3744 | 1854 | struct aspath *aspath; |
0b2aa3a0 PJ |
1855 | int send_as4_path = 0; |
1856 | int send_as4_aggregator = 0; | |
1857 | int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
718e3744 | 1858 | |
1859 | if (! bgp) | |
1860 | bgp = bgp_get_default (); | |
1861 | ||
1862 | /* Remember current pointer. */ | |
9985f83c | 1863 | cp = stream_get_endp (s); |
718e3744 | 1864 | |
1865 | /* Origin attribute. */ | |
1866 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1867 | stream_putc (s, BGP_ATTR_ORIGIN); | |
1868 | stream_putc (s, 1); | |
1869 | stream_putc (s, attr->origin); | |
1870 | ||
1871 | /* AS path attribute. */ | |
1872 | ||
1873 | /* If remote-peer is EBGP */ | |
1874 | if (peer_sort (peer) == BGP_PEER_EBGP | |
1875 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) | |
fe69a505 | 1876 | || attr->aspath->segments == NULL) |
fee0f4c6 | 1877 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 1878 | { |
1879 | aspath = aspath_dup (attr->aspath); | |
1880 | ||
1881 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1882 | { | |
1883 | /* Strip the confed info, and then stuff our path CONFED_ID | |
1884 | on the front */ | |
1885 | aspath = aspath_delete_confed_seq (aspath); | |
1886 | aspath = aspath_add_seq (aspath, bgp->confed_id); | |
1887 | } | |
1888 | else | |
1889 | { | |
1890 | aspath = aspath_add_seq (aspath, peer->local_as); | |
1891 | if (peer->change_local_as) | |
1892 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
1893 | } | |
1894 | } | |
1895 | else if (peer_sort (peer) == BGP_PEER_CONFED) | |
1896 | { | |
1897 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
1898 | aspath = aspath_dup (attr->aspath); | |
1899 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
1900 | } | |
1901 | else | |
1902 | aspath = attr->aspath; | |
1903 | ||
0b2aa3a0 PJ |
1904 | /* If peer is not AS4 capable, then: |
1905 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
1906 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment | |
1907 | * types are in it (i.e. exclude them if they are there) | |
1908 | * AND do this only if there is at least one asnum > 65535 in the path! | |
1909 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change | |
1910 | * all ASnums > 65535 to BGP_AS_TRANS | |
1911 | */ | |
1912 | ||
1913 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
1914 | stream_putc (s, BGP_ATTR_AS_PATH); | |
1915 | aspath_sizep = stream_get_endp (s); | |
1916 | stream_putw (s, 0); | |
1917 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit)); | |
1918 | ||
1919 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
1920 | * in the path | |
1921 | */ | |
1922 | if (!use32bit && aspath_has_as4 (aspath)) | |
1923 | send_as4_path = 1; /* we'll do this later, at the correct place */ | |
1924 | ||
718e3744 | 1925 | /* Nexthop attribute. */ |
1926 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP) && afi == AFI_IP) | |
1927 | { | |
1928 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1929 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
1930 | stream_putc (s, 4); | |
1931 | if (safi == SAFI_MPLS_VPN) | |
1932 | { | |
1933 | if (attr->nexthop.s_addr == 0) | |
1934 | stream_put_ipv4 (s, peer->nexthop.v4.s_addr); | |
1935 | else | |
1936 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
1937 | } | |
1938 | else | |
1939 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
1940 | } | |
1941 | ||
1942 | /* MED attribute. */ | |
1943 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
1944 | { | |
1945 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
1946 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
1947 | stream_putc (s, 4); | |
1948 | stream_putl (s, attr->med); | |
1949 | } | |
1950 | ||
1951 | /* Local preference. */ | |
1952 | if (peer_sort (peer) == BGP_PEER_IBGP || | |
1953 | peer_sort (peer) == BGP_PEER_CONFED) | |
1954 | { | |
1955 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1956 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
1957 | stream_putc (s, 4); | |
1958 | stream_putl (s, attr->local_pref); | |
1959 | } | |
1960 | ||
1961 | /* Atomic aggregate. */ | |
1962 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
1963 | { | |
1964 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
1965 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
1966 | stream_putc (s, 0); | |
1967 | } | |
1968 | ||
1969 | /* Aggregator. */ | |
1970 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
1971 | { | |
fb982c25 | 1972 | assert (attr->extra); |
0b2aa3a0 PJ |
1973 | |
1974 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
718e3744 | 1975 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
1976 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
1977 | |
1978 | if (use32bit) | |
1979 | { | |
1980 | /* AS4 capable peer */ | |
1981 | stream_putc (s, 8); | |
1982 | stream_putl (s, attr->extra->aggregator_as); | |
1983 | } | |
1984 | else | |
1985 | { | |
1986 | /* 2-byte AS peer */ | |
1987 | stream_putc (s, 6); | |
1988 | ||
1989 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */ | |
1990 | if ( attr->extra->aggregator_as > 65535 ) | |
1991 | { | |
1992 | stream_putw (s, BGP_AS_TRANS); | |
1993 | ||
1994 | /* we have to send AS4_AGGREGATOR, too. | |
1995 | * we'll do that later in order to send attributes in ascending | |
1996 | * order. | |
1997 | */ | |
1998 | send_as4_aggregator = 1; | |
1999 | } | |
2000 | else | |
2001 | stream_putw (s, (u_int16_t) attr->extra->aggregator_as); | |
2002 | } | |
fb982c25 | 2003 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 2004 | } |
2005 | ||
2006 | /* Community attribute. */ | |
2007 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
2008 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
2009 | { | |
2010 | if (attr->community->size * 4 > 255) | |
2011 | { | |
2012 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2013 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2014 | stream_putw (s, attr->community->size * 4); | |
2015 | } | |
2016 | else | |
2017 | { | |
2018 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2019 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2020 | stream_putc (s, attr->community->size * 4); | |
2021 | } | |
2022 | stream_put (s, attr->community->val, attr->community->size * 4); | |
2023 | } | |
2024 | ||
2025 | /* Route Reflector. */ | |
2026 | if (peer_sort (peer) == BGP_PEER_IBGP | |
2027 | && from | |
2028 | && peer_sort (from) == BGP_PEER_IBGP) | |
2029 | { | |
2030 | /* Originator ID. */ | |
2031 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2032 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
2033 | stream_putc (s, 4); | |
2034 | ||
2035 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
fb982c25 | 2036 | stream_put_in_addr (s, &attr->extra->originator_id); |
34c3f81b PJ |
2037 | else |
2038 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 2039 | |
2040 | /* Cluster list. */ | |
2041 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2042 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
2043 | ||
9eda90ce | 2044 | if (attr->extra && attr->extra->cluster) |
718e3744 | 2045 | { |
fb982c25 | 2046 | stream_putc (s, attr->extra->cluster->length + 4); |
718e3744 | 2047 | /* If this peer configuration's parent BGP has cluster_id. */ |
2048 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
2049 | stream_put_in_addr (s, &bgp->cluster_id); | |
2050 | else | |
2051 | stream_put_in_addr (s, &bgp->router_id); | |
fb982c25 PJ |
2052 | stream_put (s, attr->extra->cluster->list, |
2053 | attr->extra->cluster->length); | |
718e3744 | 2054 | } |
2055 | else | |
2056 | { | |
2057 | stream_putc (s, 4); | |
2058 | /* If this peer configuration's parent BGP has cluster_id. */ | |
2059 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
2060 | stream_put_in_addr (s, &bgp->cluster_id); | |
2061 | else | |
2062 | stream_put_in_addr (s, &bgp->router_id); | |
2063 | } | |
2064 | } | |
2065 | ||
2066 | #ifdef HAVE_IPV6 | |
2067 | /* If p is IPv6 address put it into attribute. */ | |
2068 | if (p->family == AF_INET6) | |
2069 | { | |
2070 | unsigned long sizep; | |
fb982c25 PJ |
2071 | struct attr_extra *attre = attr->extra; |
2072 | ||
2073 | assert (attr->extra); | |
2074 | ||
718e3744 | 2075 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); |
2076 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2077 | sizep = stream_get_endp (s); |
fb982c25 | 2078 | stream_putc (s, 0); /* Marker: Attribute length. */ |
718e3744 | 2079 | stream_putw (s, AFI_IP6); /* AFI */ |
2080 | stream_putc (s, safi); /* SAFI */ | |
2081 | ||
fb982c25 | 2082 | stream_putc (s, attre->mp_nexthop_len); |
718e3744 | 2083 | |
fb982c25 PJ |
2084 | if (attre->mp_nexthop_len == 16) |
2085 | stream_put (s, &attre->mp_nexthop_global, 16); | |
2086 | else if (attre->mp_nexthop_len == 32) | |
718e3744 | 2087 | { |
fb982c25 PJ |
2088 | stream_put (s, &attre->mp_nexthop_global, 16); |
2089 | stream_put (s, &attre->mp_nexthop_local, 16); | |
718e3744 | 2090 | } |
2091 | ||
2092 | /* SNPA */ | |
2093 | stream_putc (s, 0); | |
2094 | ||
718e3744 | 2095 | /* Prefix write. */ |
2096 | stream_put_prefix (s, p); | |
2097 | ||
2098 | /* Set MP attribute length. */ | |
9985f83c | 2099 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 2100 | } |
2101 | #endif /* HAVE_IPV6 */ | |
2102 | ||
2103 | if (p->family == AF_INET && safi == SAFI_MULTICAST) | |
2104 | { | |
2105 | unsigned long sizep; | |
718e3744 | 2106 | |
2107 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2108 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2109 | sizep = stream_get_endp (s); |
fb982c25 | 2110 | stream_putc (s, 0); /* Marker: Attribute Length. */ |
718e3744 | 2111 | stream_putw (s, AFI_IP); /* AFI */ |
2112 | stream_putc (s, SAFI_MULTICAST); /* SAFI */ | |
2113 | ||
2114 | stream_putc (s, 4); | |
2115 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2116 | ||
2117 | /* SNPA */ | |
2118 | stream_putc (s, 0); | |
2119 | ||
718e3744 | 2120 | /* Prefix write. */ |
2121 | stream_put_prefix (s, p); | |
2122 | ||
2123 | /* Set MP attribute length. */ | |
9985f83c | 2124 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 2125 | } |
2126 | ||
2127 | if (p->family == AF_INET && safi == SAFI_MPLS_VPN) | |
2128 | { | |
2129 | unsigned long sizep; | |
718e3744 | 2130 | |
2131 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2132 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2133 | sizep = stream_get_endp (s); |
718e3744 | 2134 | stream_putc (s, 0); /* Length of this attribute. */ |
2135 | stream_putw (s, AFI_IP); /* AFI */ | |
2136 | stream_putc (s, BGP_SAFI_VPNV4); /* SAFI */ | |
2137 | ||
2138 | stream_putc (s, 12); | |
2139 | stream_putl (s, 0); | |
2140 | stream_putl (s, 0); | |
fb982c25 | 2141 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); |
718e3744 | 2142 | |
2143 | /* SNPA */ | |
2144 | stream_putc (s, 0); | |
2145 | ||
718e3744 | 2146 | /* Tag, RD, Prefix write. */ |
2147 | stream_putc (s, p->prefixlen + 88); | |
2148 | stream_put (s, tag, 3); | |
2149 | stream_put (s, prd->val, 8); | |
2150 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2151 | ||
2152 | /* Set MP attribute length. */ | |
9985f83c | 2153 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 2154 | } |
2155 | ||
2156 | /* Extended Communities attribute. */ | |
2157 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
2158 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
2159 | { | |
fb982c25 PJ |
2160 | struct attr_extra *attre = attr->extra; |
2161 | ||
2162 | assert (attre); | |
2163 | ||
2164 | if (peer_sort (peer) == BGP_PEER_IBGP | |
2165 | || peer_sort (peer) == BGP_PEER_CONFED) | |
718e3744 | 2166 | { |
fb982c25 | 2167 | if (attre->ecommunity->size * 8 > 255) |
4372df71 | 2168 | { |
2169 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2170 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 2171 | stream_putw (s, attre->ecommunity->size * 8); |
4372df71 | 2172 | } |
2173 | else | |
2174 | { | |
2175 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2176 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 2177 | stream_putc (s, attre->ecommunity->size * 8); |
4372df71 | 2178 | } |
fb982c25 | 2179 | stream_put (s, attre->ecommunity->val, attre->ecommunity->size * 8); |
718e3744 | 2180 | } |
2181 | else | |
2182 | { | |
5228ad27 | 2183 | u_int8_t *pnt; |
4372df71 | 2184 | int tbit; |
2185 | int ecom_tr_size = 0; | |
2186 | int i; | |
2187 | ||
fb982c25 | 2188 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 2189 | { |
fb982c25 | 2190 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 2191 | tbit = *pnt; |
2192 | ||
2193 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
2194 | continue; | |
2195 | ||
2196 | ecom_tr_size++; | |
2197 | } | |
2198 | ||
2199 | if (ecom_tr_size) | |
2200 | { | |
2201 | if (ecom_tr_size * 8 > 255) | |
2202 | { | |
2203 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2204 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
2205 | stream_putw (s, ecom_tr_size * 8); | |
2206 | } | |
2207 | else | |
2208 | { | |
2209 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2210 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
2211 | stream_putc (s, ecom_tr_size * 8); | |
2212 | } | |
2213 | ||
fb982c25 | 2214 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 2215 | { |
fb982c25 | 2216 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 2217 | tbit = *pnt; |
2218 | ||
2219 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
2220 | continue; | |
2221 | ||
2222 | stream_put (s, pnt, 8); | |
2223 | } | |
2224 | } | |
718e3744 | 2225 | } |
718e3744 | 2226 | } |
0b2aa3a0 PJ |
2227 | |
2228 | if ( send_as4_path ) | |
2229 | { | |
2230 | /* If the peer is NOT As4 capable, AND */ | |
2231 | /* there are ASnums > 65535 in path THEN | |
2232 | * give out AS4_PATH */ | |
2233 | ||
2234 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
2235 | * path segments! | |
2236 | * Hm, I wonder... confederation things *should* only be at | |
2237 | * the beginning of an aspath, right? Then we should use | |
2238 | * aspath_delete_confed_seq for this, because it is already | |
2239 | * there! (JK) | |
2240 | * Folks, talk to me: what is reasonable here!? | |
2241 | */ | |
2242 | aspath = aspath_delete_confed_seq (aspath); | |
2243 | ||
2244 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2245 | stream_putc (s, BGP_ATTR_AS4_PATH); | |
2246 | aspath_sizep = stream_get_endp (s); | |
2247 | stream_putw (s, 0); | |
2248 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1)); | |
2249 | } | |
2250 | ||
2251 | if (aspath != attr->aspath) | |
2252 | aspath_free (aspath); | |
2253 | ||
2254 | if ( send_as4_aggregator ) | |
2255 | { | |
2256 | assert (attr->extra); | |
2257 | ||
2258 | /* send AS4_AGGREGATOR, at this place */ | |
2259 | /* this section of code moved here in order to ensure the correct | |
2260 | * *ascending* order of attributes | |
2261 | */ | |
2262 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2263 | stream_putc (s, BGP_ATTR_AS4_AGGREGATOR); | |
2264 | stream_putc (s, 8); | |
2265 | stream_putl (s, attr->extra->aggregator_as); | |
2266 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); | |
2267 | } | |
41367172 PJ |
2268 | |
2269 | /* AS-Pathlimit */ | |
2270 | if (attr->pathlimit.ttl) | |
2271 | { | |
2272 | u_int32_t as = attr->pathlimit.as; | |
2273 | ||
2274 | /* should already have been done in announce_check(), | |
2275 | * but just in case.. | |
2276 | */ | |
2277 | if (!as) | |
2278 | as = peer->local_as; | |
2279 | ||
2280 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2281 | stream_putc (s, BGP_ATTR_AS_PATHLIMIT); | |
2282 | stream_putc (s, 5); | |
2283 | stream_putc (s, attr->pathlimit.ttl); | |
2284 | stream_putl (s, as); | |
2285 | } | |
2286 | ||
718e3744 | 2287 | /* Unknown transit attribute. */ |
fb982c25 PJ |
2288 | if (attr->extra && attr->extra->transit) |
2289 | stream_put (s, attr->extra->transit->val, attr->extra->transit->length); | |
718e3744 | 2290 | |
2291 | /* Return total size of attribute. */ | |
9985f83c | 2292 | return stream_get_endp (s) - cp; |
718e3744 | 2293 | } |
2294 | ||
2295 | bgp_size_t | |
2296 | bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p, | |
2297 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
a3b6ea56 | 2298 | u_char *tag) |
718e3744 | 2299 | { |
2300 | unsigned long cp; | |
2301 | unsigned long attrlen_pnt; | |
2302 | bgp_size_t size; | |
2303 | ||
9985f83c | 2304 | cp = stream_get_endp (s); |
718e3744 | 2305 | |
2306 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2307 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); | |
2308 | ||
9985f83c | 2309 | attrlen_pnt = stream_get_endp (s); |
718e3744 | 2310 | stream_putc (s, 0); /* Length of this attribute. */ |
2311 | ||
2312 | stream_putw (s, family2afi (p->family)); | |
2313 | ||
2314 | if (safi == SAFI_MPLS_VPN) | |
2315 | { | |
2316 | /* SAFI */ | |
2317 | stream_putc (s, BGP_SAFI_VPNV4); | |
2318 | ||
2319 | /* prefix. */ | |
2320 | stream_putc (s, p->prefixlen + 88); | |
2321 | stream_put (s, tag, 3); | |
2322 | stream_put (s, prd->val, 8); | |
2323 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2324 | } | |
2325 | else | |
2326 | { | |
2327 | /* SAFI */ | |
2328 | stream_putc (s, safi); | |
2329 | ||
2330 | /* prefix */ | |
2331 | stream_put_prefix (s, p); | |
2332 | } | |
2333 | ||
2334 | /* Set MP attribute length. */ | |
9985f83c | 2335 | size = stream_get_endp (s) - attrlen_pnt - 1; |
718e3744 | 2336 | stream_putc_at (s, attrlen_pnt, size); |
2337 | ||
9985f83c | 2338 | return stream_get_endp (s) - cp; |
718e3744 | 2339 | } |
2340 | ||
2341 | /* Initialization of attribute. */ | |
2342 | void | |
fe69a505 | 2343 | bgp_attr_init (void) |
718e3744 | 2344 | { |
718e3744 | 2345 | aspath_init (); |
2346 | attrhash_init (); | |
2347 | community_init (); | |
2348 | ecommunity_init (); | |
2349 | cluster_init (); | |
2350 | transit_init (); | |
2351 | } | |
2352 | ||
228da428 CC |
2353 | void |
2354 | bgp_attr_finish (void) | |
2355 | { | |
2356 | aspath_finish (); | |
2357 | attrhash_finish (); | |
2358 | community_finish (); | |
2359 | ecommunity_finish (); | |
2360 | cluster_finish (); | |
2361 | transit_finish (); | |
2362 | } | |
2363 | ||
718e3744 | 2364 | /* Make attribute packet. */ |
2365 | void | |
a384592f | 2366 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
2367 | struct prefix *prefix) | |
718e3744 | 2368 | { |
2369 | unsigned long cp; | |
2370 | unsigned long len; | |
0b2aa3a0 | 2371 | size_t aspath_lenp; |
718e3744 | 2372 | struct aspath *aspath; |
2373 | ||
2374 | /* Remember current pointer. */ | |
9985f83c | 2375 | cp = stream_get_endp (s); |
718e3744 | 2376 | |
2377 | /* Place holder of length. */ | |
2378 | stream_putw (s, 0); | |
2379 | ||
2380 | /* Origin attribute. */ | |
2381 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2382 | stream_putc (s, BGP_ATTR_ORIGIN); | |
2383 | stream_putc (s, 1); | |
2384 | stream_putc (s, attr->origin); | |
2385 | ||
2386 | aspath = attr->aspath; | |
0b2aa3a0 PJ |
2387 | |
2388 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2389 | stream_putc (s, BGP_ATTR_AS_PATH); | |
2390 | aspath_lenp = stream_get_endp (s); | |
2391 | stream_putw (s, 0); | |
2392 | ||
2393 | stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1)); | |
718e3744 | 2394 | |
2395 | /* Nexthop attribute. */ | |
a384592f | 2396 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
2397 | if(prefix != NULL | |
2398 | #ifdef HAVE_IPV6 | |
2399 | && prefix->family != AF_INET6 | |
2400 | #endif /* HAVE_IPV6 */ | |
2401 | ) | |
2402 | { | |
2403 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2404 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2405 | stream_putc (s, 4); | |
2406 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2407 | } | |
718e3744 | 2408 | |
2409 | /* MED attribute. */ | |
2410 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
2411 | { | |
2412 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2413 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
2414 | stream_putc (s, 4); | |
2415 | stream_putl (s, attr->med); | |
2416 | } | |
2417 | ||
2418 | /* Local preference. */ | |
2419 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
2420 | { | |
2421 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2422 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
2423 | stream_putc (s, 4); | |
2424 | stream_putl (s, attr->local_pref); | |
2425 | } | |
2426 | ||
2427 | /* Atomic aggregate. */ | |
2428 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
2429 | { | |
2430 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2431 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
2432 | stream_putc (s, 0); | |
2433 | } | |
2434 | ||
2435 | /* Aggregator. */ | |
2436 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
2437 | { | |
fb982c25 | 2438 | assert (attr->extra); |
718e3744 | 2439 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
2440 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
2441 | stream_putc (s, 8); |
2442 | stream_putl (s, attr->extra->aggregator_as); | |
fb982c25 | 2443 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 2444 | } |
2445 | ||
2446 | /* Community attribute. */ | |
2447 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
2448 | { | |
2449 | if (attr->community->size * 4 > 255) | |
2450 | { | |
2451 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2452 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2453 | stream_putw (s, attr->community->size * 4); | |
2454 | } | |
2455 | else | |
2456 | { | |
2457 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2458 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2459 | stream_putc (s, attr->community->size * 4); | |
2460 | } | |
2461 | stream_put (s, attr->community->val, attr->community->size * 4); | |
2462 | } | |
2463 | ||
a384592f | 2464 | #ifdef HAVE_IPV6 |
2465 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
fb982c25 PJ |
2466 | if (prefix != NULL && prefix->family == AF_INET6 && attr->extra && |
2467 | (attr->extra->mp_nexthop_len == 16 || attr->extra->mp_nexthop_len == 32) ) | |
a384592f | 2468 | { |
2469 | int sizep; | |
fb982c25 PJ |
2470 | struct attr_extra *attre = attr->extra; |
2471 | ||
a384592f | 2472 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); |
2473 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2474 | sizep = stream_get_endp (s); |
a384592f | 2475 | |
2476 | /* MP header */ | |
fb982c25 | 2477 | stream_putc (s, 0); /* Marker: Attribute length. */ |
a384592f | 2478 | stream_putw(s, AFI_IP6); /* AFI */ |
2479 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
2480 | ||
2481 | /* Next hop */ | |
fb982c25 PJ |
2482 | stream_putc(s, attre->mp_nexthop_len); |
2483 | stream_put(s, &attre->mp_nexthop_global, 16); | |
2484 | if (attre->mp_nexthop_len == 32) | |
2485 | stream_put(s, &attre->mp_nexthop_local, 16); | |
a384592f | 2486 | |
2487 | /* SNPA */ | |
2488 | stream_putc(s, 0); | |
2489 | ||
2490 | /* Prefix */ | |
2491 | stream_put_prefix(s, prefix); | |
2492 | ||
2493 | /* Set MP attribute length. */ | |
9985f83c | 2494 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 2495 | } |
2496 | #endif /* HAVE_IPV6 */ | |
2497 | ||
41367172 PJ |
2498 | /* AS-Pathlimit */ |
2499 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AS_PATHLIMIT)) | |
2500 | { | |
2501 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2502 | stream_putc (s, BGP_ATTR_AS_PATHLIMIT); | |
2503 | stream_putc (s, 5); | |
2504 | stream_putc (s, attr->pathlimit.ttl); | |
2505 | stream_putl (s, attr->pathlimit.as); | |
2506 | } | |
2507 | ||
718e3744 | 2508 | /* Return total size of attribute. */ |
9985f83c | 2509 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 2510 | stream_putw_at (s, cp, len); |
2511 | } |