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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" | |
c8e7b895 | 31 | #include "jhash.h" |
3f9c7369 | 32 | #include "queue.h" |
718e3744 | 33 | |
34 | #include "bgpd/bgpd.h" | |
35 | #include "bgpd/bgp_attr.h" | |
36 | #include "bgpd/bgp_route.h" | |
37 | #include "bgpd/bgp_aspath.h" | |
38 | #include "bgpd/bgp_community.h" | |
39 | #include "bgpd/bgp_debug.h" | |
40 | #include "bgpd/bgp_packet.h" | |
41 | #include "bgpd/bgp_ecommunity.h" | |
3f9c7369 | 42 | #include "bgpd/bgp_updgrp.h" |
6b0655a2 | 43 | |
718e3744 | 44 | /* Attribute strings for logging. */ |
9bddac4b | 45 | static const struct message attr_str [] = |
718e3744 | 46 | { |
47 | { BGP_ATTR_ORIGIN, "ORIGIN" }, | |
48 | { BGP_ATTR_AS_PATH, "AS_PATH" }, | |
49 | { BGP_ATTR_NEXT_HOP, "NEXT_HOP" }, | |
50 | { BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" }, | |
51 | { BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" }, | |
52 | { BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" }, | |
53 | { BGP_ATTR_AGGREGATOR, "AGGREGATOR" }, | |
54 | { BGP_ATTR_COMMUNITIES, "COMMUNITY" }, | |
55 | { BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" }, | |
f8627ff1 | 56 | { BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST" }, |
718e3744 | 57 | { BGP_ATTR_DPA, "DPA" }, |
58 | { BGP_ATTR_ADVERTISER, "ADVERTISER"} , | |
59 | { BGP_ATTR_RCID_PATH, "RCID_PATH" }, | |
60 | { BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" }, | |
61 | { BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" }, | |
0b2aa3a0 PJ |
62 | { BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" }, |
63 | { BGP_ATTR_AS4_PATH, "AS4_PATH" }, | |
64 | { BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" }, | |
65 | { BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" }, | |
718e3744 | 66 | }; |
837d16cc | 67 | static const int attr_str_max = array_size(attr_str); |
afcb7679 DO |
68 | |
69 | static const struct message attr_flag_str[] = | |
70 | { | |
71 | { BGP_ATTR_FLAG_OPTIONAL, "Optional" }, | |
72 | { BGP_ATTR_FLAG_TRANS, "Transitive" }, | |
73 | { BGP_ATTR_FLAG_PARTIAL, "Partial" }, | |
74 | /* bgp_attr_flags_diagnose() relies on this bit being last in this list */ | |
75 | { BGP_ATTR_FLAG_EXTLEN, "Extended Length" }, | |
76 | }; | |
6b0655a2 | 77 | |
9bddac4b | 78 | static struct hash *cluster_hash; |
718e3744 | 79 | |
94f2b392 | 80 | static void * |
923de654 | 81 | cluster_hash_alloc (void *p) |
718e3744 | 82 | { |
ffd0c037 | 83 | const struct cluster_list *val = (const struct cluster_list *) p; |
718e3744 | 84 | struct cluster_list *cluster; |
85 | ||
86 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
87 | cluster->length = val->length; | |
88 | ||
89 | if (cluster->length) | |
90 | { | |
91 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
92 | memcpy (cluster->list, val->list, val->length); | |
93 | } | |
94 | else | |
95 | cluster->list = NULL; | |
96 | ||
97 | cluster->refcnt = 0; | |
98 | ||
99 | return cluster; | |
100 | } | |
101 | ||
102 | /* Cluster list related functions. */ | |
94f2b392 | 103 | static struct cluster_list * |
5228ad27 | 104 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 105 | { |
106 | struct cluster_list tmp; | |
107 | struct cluster_list *cluster; | |
108 | ||
109 | tmp.length = length; | |
5228ad27 | 110 | tmp.list = pnt; |
718e3744 | 111 | |
112 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
113 | cluster->refcnt++; | |
114 | return cluster; | |
115 | } | |
116 | ||
117 | int | |
118 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
119 | { | |
120 | int i; | |
121 | ||
122 | for (i = 0; i < cluster->length / 4; i++) | |
123 | if (cluster->list[i].s_addr == originator.s_addr) | |
124 | return 1; | |
125 | return 0; | |
126 | } | |
127 | ||
94f2b392 | 128 | static unsigned int |
923de654 | 129 | cluster_hash_key_make (void *p) |
718e3744 | 130 | { |
c8e7b895 | 131 | const struct cluster_list *cluster = p; |
718e3744 | 132 | |
c8e7b895 | 133 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 134 | } |
135 | ||
94f2b392 | 136 | static int |
ffe11cfb | 137 | cluster_hash_cmp (const void *p1, const void *p2) |
718e3744 | 138 | { |
ffe11cfb SH |
139 | const struct cluster_list * cluster1 = p1; |
140 | const struct cluster_list * cluster2 = p2; | |
923de654 | 141 | |
ffe11cfb SH |
142 | return (cluster1->length == cluster2->length && |
143 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 144 | } |
145 | ||
94f2b392 | 146 | static void |
718e3744 | 147 | cluster_free (struct cluster_list *cluster) |
148 | { | |
149 | if (cluster->list) | |
150 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
151 | XFREE (MTYPE_CLUSTER, cluster); | |
152 | } | |
153 | ||
94f2b392 | 154 | static struct cluster_list * |
718e3744 | 155 | cluster_dup (struct cluster_list *cluster) |
156 | { | |
157 | struct cluster_list *new; | |
158 | ||
393deb9b | 159 | new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); |
718e3744 | 160 | new->length = cluster->length; |
161 | ||
162 | if (cluster->length) | |
163 | { | |
164 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
165 | memcpy (new->list, cluster->list, cluster->length); | |
166 | } | |
167 | else | |
168 | new->list = NULL; | |
169 | ||
170 | return new; | |
171 | } | |
172 | ||
94f2b392 | 173 | static struct cluster_list * |
718e3744 | 174 | cluster_intern (struct cluster_list *cluster) |
175 | { | |
176 | struct cluster_list *find; | |
177 | ||
178 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
179 | find->refcnt++; | |
180 | ||
181 | return find; | |
182 | } | |
183 | ||
184 | void | |
185 | cluster_unintern (struct cluster_list *cluster) | |
186 | { | |
718e3744 | 187 | if (cluster->refcnt) |
188 | cluster->refcnt--; | |
189 | ||
190 | if (cluster->refcnt == 0) | |
191 | { | |
9206f9ec | 192 | hash_release (cluster_hash, cluster); |
718e3744 | 193 | cluster_free (cluster); |
194 | } | |
195 | } | |
196 | ||
94f2b392 | 197 | static void |
198 | cluster_init (void) | |
718e3744 | 199 | { |
200 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp); | |
201 | } | |
228da428 CC |
202 | |
203 | static void | |
204 | cluster_finish (void) | |
205 | { | |
206 | hash_free (cluster_hash); | |
207 | cluster_hash = NULL; | |
208 | } | |
6b0655a2 | 209 | |
718e3744 | 210 | /* Unknown transit attribute. */ |
9bddac4b | 211 | static struct hash *transit_hash; |
718e3744 | 212 | |
94f2b392 | 213 | static void |
718e3744 | 214 | transit_free (struct transit *transit) |
215 | { | |
216 | if (transit->val) | |
217 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
218 | XFREE (MTYPE_TRANSIT, transit); | |
219 | } | |
220 | ||
73ac8160 DS |
221 | static struct transit * |
222 | transit_dup (struct transit *transit) | |
223 | { | |
224 | struct transit *new; | |
225 | ||
226 | new = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); | |
227 | new->length = transit->length; | |
228 | if (new->length) | |
229 | { | |
230 | new->val = XMALLOC (MTYPE_TRANSIT_VAL, transit->length); | |
231 | memcpy (new->val, transit->val, transit->length); | |
232 | } | |
233 | else | |
234 | new->val = NULL; | |
235 | ||
236 | return new; | |
237 | } | |
923de654 | 238 | |
94f2b392 | 239 | static void * |
923de654 | 240 | transit_hash_alloc (void *p) |
718e3744 | 241 | { |
242 | /* Transit structure is already allocated. */ | |
923de654 | 243 | return p; |
718e3744 | 244 | } |
245 | ||
94f2b392 | 246 | static struct transit * |
718e3744 | 247 | transit_intern (struct transit *transit) |
248 | { | |
249 | struct transit *find; | |
250 | ||
251 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
252 | if (find != transit) | |
253 | transit_free (transit); | |
254 | find->refcnt++; | |
255 | ||
256 | return find; | |
257 | } | |
258 | ||
259 | void | |
260 | transit_unintern (struct transit *transit) | |
261 | { | |
718e3744 | 262 | if (transit->refcnt) |
263 | transit->refcnt--; | |
264 | ||
265 | if (transit->refcnt == 0) | |
266 | { | |
9206f9ec | 267 | hash_release (transit_hash, transit); |
718e3744 | 268 | transit_free (transit); |
269 | } | |
270 | } | |
271 | ||
94f2b392 | 272 | static unsigned int |
923de654 | 273 | transit_hash_key_make (void *p) |
718e3744 | 274 | { |
c8e7b895 | 275 | const struct transit * transit = p; |
718e3744 | 276 | |
c8e7b895 | 277 | return jhash(transit->val, transit->length, 0); |
718e3744 | 278 | } |
279 | ||
94f2b392 | 280 | static int |
ffe11cfb | 281 | transit_hash_cmp (const void *p1, const void *p2) |
718e3744 | 282 | { |
ffe11cfb SH |
283 | const struct transit * transit1 = p1; |
284 | const struct transit * transit2 = p2; | |
923de654 | 285 | |
ffe11cfb SH |
286 | return (transit1->length == transit2->length && |
287 | memcmp (transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 288 | } |
289 | ||
94f2b392 | 290 | static void |
66e5cd87 | 291 | transit_init (void) |
718e3744 | 292 | { |
293 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp); | |
294 | } | |
228da428 CC |
295 | |
296 | static void | |
297 | transit_finish (void) | |
298 | { | |
299 | hash_free (transit_hash); | |
300 | transit_hash = NULL; | |
301 | } | |
6b0655a2 | 302 | |
718e3744 | 303 | /* Attribute hash routines. */ |
9bddac4b | 304 | static struct hash *attrhash; |
718e3744 | 305 | |
fb982c25 PJ |
306 | static struct attr_extra * |
307 | bgp_attr_extra_new (void) | |
308 | { | |
309 | return XCALLOC (MTYPE_ATTR_EXTRA, sizeof (struct attr_extra)); | |
310 | } | |
311 | ||
312 | void | |
313 | bgp_attr_extra_free (struct attr *attr) | |
314 | { | |
315 | if (attr->extra) | |
316 | { | |
317 | XFREE (MTYPE_ATTR_EXTRA, attr->extra); | |
318 | attr->extra = NULL; | |
319 | } | |
320 | } | |
321 | ||
322 | struct attr_extra * | |
323 | bgp_attr_extra_get (struct attr *attr) | |
324 | { | |
325 | if (!attr->extra) | |
326 | attr->extra = bgp_attr_extra_new(); | |
327 | return attr->extra; | |
328 | } | |
329 | ||
330 | /* Shallow copy of an attribute | |
331 | * Though, not so shallow that it doesn't copy the contents | |
332 | * of the attr_extra pointed to by 'extra' | |
333 | */ | |
334 | void | |
335 | bgp_attr_dup (struct attr *new, struct attr *orig) | |
336 | { | |
558d1fec JBD |
337 | struct attr_extra *extra = new->extra; |
338 | ||
fb982c25 | 339 | *new = *orig; |
a0de1d16 CF |
340 | /* if caller provided attr_extra space, use it in any case. |
341 | * | |
342 | * This is neccesary even if orig->extra equals NULL, because otherwise | |
343 | * memory may be later allocated on the heap by bgp_attr_extra_get. | |
344 | * | |
345 | * That memory would eventually be leaked, because the caller must not | |
346 | * call bgp_attr_extra_free if he provided attr_extra on the stack. | |
347 | */ | |
348 | if (extra) | |
349 | { | |
350 | new->extra = extra; | |
351 | memset(new->extra, 0, sizeof(struct attr_extra)); | |
352 | if (orig->extra) | |
353 | *new->extra = *orig->extra; | |
354 | } | |
355 | else if (orig->extra) | |
fb982c25 | 356 | { |
a0de1d16 | 357 | new->extra = bgp_attr_extra_new(); |
fb982c25 PJ |
358 | *new->extra = *orig->extra; |
359 | } | |
360 | } | |
361 | ||
73ac8160 DS |
362 | void |
363 | bgp_attr_deep_dup (struct attr *new, struct attr *orig) | |
364 | { | |
365 | if (orig->aspath) | |
366 | new->aspath = aspath_dup(orig->aspath); | |
367 | ||
368 | if (orig->community) | |
369 | new->community = community_dup(orig->community); | |
370 | ||
371 | if (orig->extra) | |
372 | { | |
373 | if (orig->extra->ecommunity) | |
374 | new->extra->ecommunity = ecommunity_dup(orig->extra->ecommunity); | |
375 | if (orig->extra->cluster) | |
376 | new->extra->cluster = cluster_dup(orig->extra->cluster); | |
377 | if (orig->extra->transit) | |
378 | new->extra->transit = transit_dup(orig->extra->transit); | |
379 | } | |
380 | } | |
381 | ||
382 | void | |
383 | bgp_attr_deep_free (struct attr *attr) | |
384 | { | |
385 | if (attr->aspath) | |
386 | aspath_free(attr->aspath); | |
387 | ||
388 | if (attr->community) | |
389 | community_free(attr->community); | |
390 | ||
391 | if (attr->extra) | |
392 | { | |
393 | if (attr->extra->ecommunity) | |
394 | ecommunity_free(&attr->extra->ecommunity); | |
395 | if (attr->extra->cluster) | |
396 | cluster_free(attr->extra->cluster); | |
397 | if (attr->extra->transit) | |
398 | transit_free(attr->extra->transit); | |
399 | } | |
400 | } | |
401 | ||
cbdfbaa5 PJ |
402 | unsigned long int |
403 | attr_count (void) | |
404 | { | |
405 | return attrhash->count; | |
406 | } | |
407 | ||
408 | unsigned long int | |
409 | attr_unknown_count (void) | |
410 | { | |
411 | return transit_hash->count; | |
412 | } | |
413 | ||
718e3744 | 414 | unsigned int |
923de654 | 415 | attrhash_key_make (void *p) |
718e3744 | 416 | { |
7fb0cd82 JBD |
417 | const struct attr *attr = (struct attr *) p; |
418 | const struct attr_extra *extra = attr->extra; | |
c8e7b895 SH |
419 | uint32_t key = 0; |
420 | #define MIX(val) key = jhash_1word(val, key) | |
421 | ||
422 | MIX(attr->origin); | |
423 | MIX(attr->nexthop.s_addr); | |
424 | MIX(attr->med); | |
425 | MIX(attr->local_pref); | |
718e3744 | 426 | |
c8f3fe30 PJ |
427 | key += attr->origin; |
428 | key += attr->nexthop.s_addr; | |
429 | key += attr->med; | |
430 | key += attr->local_pref; | |
fb982c25 | 431 | |
7fb0cd82 | 432 | if (extra) |
fb982c25 | 433 | { |
7fb0cd82 JBD |
434 | MIX(extra->aggregator_as); |
435 | MIX(extra->aggregator_addr.s_addr); | |
436 | MIX(extra->weight); | |
437 | MIX(extra->mp_nexthop_global_in.s_addr); | |
689bb66c | 438 | MIX(extra->originator_id.s_addr); |
0d9551dc | 439 | MIX(extra->tag); |
fb982c25 PJ |
440 | } |
441 | ||
718e3744 | 442 | if (attr->aspath) |
c8e7b895 | 443 | MIX(aspath_key_make (attr->aspath)); |
718e3744 | 444 | if (attr->community) |
c8e7b895 | 445 | MIX(community_hash_make (attr->community)); |
fb982c25 | 446 | |
7fb0cd82 | 447 | if (extra) |
fb982c25 | 448 | { |
7fb0cd82 JBD |
449 | if (extra->ecommunity) |
450 | MIX(ecommunity_hash_make (extra->ecommunity)); | |
451 | if (extra->cluster) | |
452 | MIX(cluster_hash_key_make (extra->cluster)); | |
453 | if (extra->transit) | |
454 | MIX(transit_hash_key_make (extra->transit)); | |
718e3744 | 455 | |
456 | #ifdef HAVE_IPV6 | |
7fb0cd82 | 457 | MIX(extra->mp_nexthop_len); |
801a9bcc DS |
458 | key = jhash(extra->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); |
459 | key = jhash(extra->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
718e3744 | 460 | #endif /* HAVE_IPV6 */ |
fb982c25 | 461 | } |
718e3744 | 462 | |
463 | return key; | |
464 | } | |
465 | ||
466 | int | |
ffe11cfb | 467 | attrhash_cmp (const void *p1, const void *p2) |
718e3744 | 468 | { |
ffe11cfb SH |
469 | const struct attr * attr1 = p1; |
470 | const struct attr * attr2 = p2; | |
923de654 | 471 | |
718e3744 | 472 | if (attr1->flag == attr2->flag |
473 | && attr1->origin == attr2->origin | |
474 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
fb982c25 PJ |
475 | && attr1->aspath == attr2->aspath |
476 | && attr1->community == attr2->community | |
718e3744 | 477 | && attr1->med == attr2->med |
3f9c7369 DS |
478 | && attr1->local_pref == attr2->local_pref |
479 | && attr1->rmap_change_flags == attr2->rmap_change_flags) | |
fb982c25 | 480 | { |
ffe11cfb SH |
481 | const struct attr_extra *ae1 = attr1->extra; |
482 | const struct attr_extra *ae2 = attr2->extra; | |
fb982c25 PJ |
483 | |
484 | if (ae1 && ae2 | |
485 | && ae1->aggregator_as == ae2->aggregator_as | |
486 | && ae1->aggregator_addr.s_addr == ae2->aggregator_addr.s_addr | |
487 | && ae1->weight == ae2->weight | |
0d9551dc | 488 | && ae1->tag == ae2->tag |
718e3744 | 489 | #ifdef HAVE_IPV6 |
fb982c25 PJ |
490 | && ae1->mp_nexthop_len == ae2->mp_nexthop_len |
491 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_global, &ae2->mp_nexthop_global) | |
492 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_local, &ae2->mp_nexthop_local) | |
718e3744 | 493 | #endif /* HAVE_IPV6 */ |
fb982c25 PJ |
494 | && IPV4_ADDR_SAME (&ae1->mp_nexthop_global_in, &ae2->mp_nexthop_global_in) |
495 | && ae1->ecommunity == ae2->ecommunity | |
496 | && ae1->cluster == ae2->cluster | |
689bb66c PM |
497 | && ae1->transit == ae2->transit |
498 | && IPV4_ADDR_SAME (&ae1->originator_id, &ae2->originator_id)) | |
fb982c25 PJ |
499 | return 1; |
500 | else if (ae1 || ae2) | |
501 | return 0; | |
502 | /* neither attribute has extra attributes, so they're same */ | |
503 | return 1; | |
504 | } | |
718e3744 | 505 | else |
506 | return 0; | |
507 | } | |
508 | ||
94f2b392 | 509 | static void |
ffe11cfb | 510 | attrhash_init (void) |
718e3744 | 511 | { |
512 | attrhash = hash_create (attrhash_key_make, attrhash_cmp); | |
513 | } | |
514 | ||
228da428 CC |
515 | static void |
516 | attrhash_finish (void) | |
517 | { | |
518 | hash_free (attrhash); | |
519 | attrhash = NULL; | |
520 | } | |
521 | ||
94f2b392 | 522 | static void |
718e3744 | 523 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
524 | { | |
525 | struct attr *attr = backet->data; | |
526 | ||
527 | vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt, | |
528 | inet_ntoa (attr->nexthop), VTY_NEWLINE); | |
529 | } | |
530 | ||
531 | void | |
532 | attr_show_all (struct vty *vty) | |
533 | { | |
534 | hash_iterate (attrhash, | |
535 | (void (*)(struct hash_backet *, void *)) | |
536 | attr_show_all_iterator, | |
537 | vty); | |
538 | } | |
539 | ||
94f2b392 | 540 | static void * |
923de654 | 541 | bgp_attr_hash_alloc (void *p) |
718e3744 | 542 | { |
ffd0c037 | 543 | const struct attr * val = (const struct attr *) p; |
718e3744 | 544 | struct attr *attr; |
545 | ||
546 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
547 | *attr = *val; | |
fb982c25 PJ |
548 | if (val->extra) |
549 | { | |
550 | attr->extra = bgp_attr_extra_new (); | |
551 | *attr->extra = *val->extra; | |
552 | } | |
718e3744 | 553 | attr->refcnt = 0; |
554 | return attr; | |
555 | } | |
556 | ||
557 | /* Internet argument attribute. */ | |
558 | struct attr * | |
559 | bgp_attr_intern (struct attr *attr) | |
560 | { | |
561 | struct attr *find; | |
562 | ||
563 | /* Intern referenced strucutre. */ | |
564 | if (attr->aspath) | |
565 | { | |
566 | if (! attr->aspath->refcnt) | |
567 | attr->aspath = aspath_intern (attr->aspath); | |
568 | else | |
569 | attr->aspath->refcnt++; | |
570 | } | |
571 | if (attr->community) | |
572 | { | |
573 | if (! attr->community->refcnt) | |
574 | attr->community = community_intern (attr->community); | |
575 | else | |
576 | attr->community->refcnt++; | |
577 | } | |
fb982c25 | 578 | if (attr->extra) |
718e3744 | 579 | { |
fb982c25 PJ |
580 | struct attr_extra *attre = attr->extra; |
581 | ||
582 | if (attre->ecommunity) | |
583 | { | |
584 | if (! attre->ecommunity->refcnt) | |
585 | attre->ecommunity = ecommunity_intern (attre->ecommunity); | |
586 | else | |
587 | attre->ecommunity->refcnt++; | |
f6f434b2 | 588 | |
fb982c25 PJ |
589 | } |
590 | if (attre->cluster) | |
591 | { | |
592 | if (! attre->cluster->refcnt) | |
593 | attre->cluster = cluster_intern (attre->cluster); | |
594 | else | |
595 | attre->cluster->refcnt++; | |
596 | } | |
597 | if (attre->transit) | |
598 | { | |
599 | if (! attre->transit->refcnt) | |
600 | attre->transit = transit_intern (attre->transit); | |
601 | else | |
602 | attre->transit->refcnt++; | |
603 | } | |
718e3744 | 604 | } |
f6f434b2 | 605 | |
718e3744 | 606 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); |
607 | find->refcnt++; | |
f6f434b2 | 608 | |
718e3744 | 609 | return find; |
610 | } | |
611 | ||
3f9c7369 DS |
612 | /** |
613 | * Increment the refcount on various structures that attr holds. | |
614 | * Note on usage: call _only_ when the 'attr' object has already | |
615 | * been 'intern'ed and exists in 'attrhash' table. The function | |
616 | * serves to hold a reference to that (real) object. | |
617 | * Note also that the caller can safely call bgp_attr_unintern() | |
618 | * after calling bgp_attr_refcount(). That would release the | |
619 | * reference and could result in a free() of the attr object. | |
620 | */ | |
621 | struct attr * | |
622 | bgp_attr_refcount (struct attr *attr) | |
623 | { | |
624 | /* Intern referenced strucutre. */ | |
625 | if (attr->aspath) | |
626 | attr->aspath->refcnt++; | |
627 | ||
628 | if (attr->community) | |
629 | attr->community->refcnt++; | |
630 | ||
631 | if (attr->extra) | |
632 | { | |
633 | struct attr_extra *attre = attr->extra; | |
634 | if (attre->ecommunity) | |
635 | attre->ecommunity->refcnt++; | |
636 | ||
637 | if (attre->cluster) | |
638 | attre->cluster->refcnt++; | |
639 | ||
640 | if (attre->transit) | |
641 | attre->transit->refcnt++; | |
642 | } | |
643 | attr->refcnt++; | |
644 | return attr; | |
645 | } | |
03e214c8 | 646 | |
718e3744 | 647 | /* Make network statement's attribute. */ |
648 | struct attr * | |
649 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
650 | { | |
651 | memset (attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
652 | bgp_attr_extra_get (attr); |
653 | ||
718e3744 | 654 | attr->origin = origin; |
655 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
656 | attr->aspath = aspath_empty (); | |
657 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
fb982c25 | 658 | attr->extra->weight = BGP_ATTR_DEFAULT_WEIGHT; |
0d9551dc | 659 | attr->extra->tag = 0; |
718e3744 | 660 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
661 | #ifdef HAVE_IPV6 | |
fb982c25 | 662 | attr->extra->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 663 | #endif |
03e214c8 | 664 | |
718e3744 | 665 | return attr; |
666 | } | |
667 | ||
03e214c8 | 668 | |
718e3744 | 669 | /* Make network statement's attribute. */ |
670 | struct attr * | |
671 | bgp_attr_default_intern (u_char origin) | |
672 | { | |
673 | struct attr attr; | |
674 | struct attr *new; | |
e16a4133 | 675 | |
03e214c8 | 676 | bgp_attr_default_set(&attr, origin); |
718e3744 | 677 | |
678 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
679 | bgp_attr_extra_free (&attr); |
680 | ||
f6f434b2 | 681 | aspath_unintern (&new->aspath); |
718e3744 | 682 | return new; |
683 | } | |
684 | ||
b5d58c32 | 685 | /* Create the attributes for an aggregate */ |
718e3744 | 686 | struct attr * |
687 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
688 | struct aspath *aspath, | |
42f7e184 DS |
689 | struct community *community, int as_set, |
690 | u_char atomic_aggregate) | |
718e3744 | 691 | { |
692 | struct attr attr; | |
693 | struct attr *new; | |
938ef3a2 | 694 | struct attr_extra attre; |
718e3744 | 695 | |
696 | memset (&attr, 0, sizeof (struct attr)); | |
938ef3a2 JBD |
697 | memset (&attre, 0, sizeof (struct attr_extra)); |
698 | attr.extra = &attre; | |
699 | ||
718e3744 | 700 | /* Origin attribute. */ |
701 | attr.origin = origin; | |
702 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
703 | ||
704 | /* AS path attribute. */ | |
705 | if (aspath) | |
706 | attr.aspath = aspath_intern (aspath); | |
707 | else | |
708 | attr.aspath = aspath_empty (); | |
709 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
710 | ||
711 | /* Next hop attribute. */ | |
712 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
713 | ||
714 | if (community) | |
715 | { | |
716 | attr.community = community; | |
717 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
718 | } | |
719 | ||
938ef3a2 | 720 | attre.weight = BGP_ATTR_DEFAULT_WEIGHT; |
718e3744 | 721 | #ifdef HAVE_IPV6 |
938ef3a2 | 722 | attre.mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 723 | #endif |
42f7e184 | 724 | if (! as_set || atomic_aggregate) |
718e3744 | 725 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); |
726 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
727 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
938ef3a2 | 728 | attre.aggregator_as = bgp->confed_id; |
718e3744 | 729 | else |
938ef3a2 JBD |
730 | attre.aggregator_as = bgp->as; |
731 | attre.aggregator_addr = bgp->router_id; | |
718e3744 | 732 | |
733 | new = bgp_attr_intern (&attr); | |
938ef3a2 | 734 | |
f6f434b2 | 735 | aspath_unintern (&new->aspath); |
718e3744 | 736 | return new; |
737 | } | |
738 | ||
b881c707 PJ |
739 | /* Unintern just the sub-components of the attr, but not the attr */ |
740 | void | |
741 | bgp_attr_unintern_sub (struct attr *attr) | |
742 | { | |
743 | /* aspath refcount shoud be decrement. */ | |
744 | if (attr->aspath) | |
745 | aspath_unintern (&attr->aspath); | |
d92a2f39 | 746 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)); |
b881c707 PJ |
747 | |
748 | if (attr->community) | |
749 | community_unintern (&attr->community); | |
d92a2f39 | 750 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)); |
b881c707 PJ |
751 | |
752 | if (attr->extra) | |
753 | { | |
754 | if (attr->extra->ecommunity) | |
755 | ecommunity_unintern (&attr->extra->ecommunity); | |
d92a2f39 | 756 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES)); |
b881c707 PJ |
757 | |
758 | if (attr->extra->cluster) | |
759 | cluster_unintern (attr->extra->cluster); | |
d92a2f39 | 760 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST)); |
b881c707 PJ |
761 | |
762 | if (attr->extra->transit) | |
763 | transit_unintern (attr->extra->transit); | |
764 | } | |
765 | } | |
766 | ||
718e3744 | 767 | /* Free bgp attribute and aspath. */ |
768 | void | |
1a2fd707 | 769 | bgp_attr_unintern (struct attr **pattr) |
718e3744 | 770 | { |
1a2fd707 | 771 | struct attr *attr = *pattr; |
718e3744 | 772 | struct attr *ret; |
b881c707 | 773 | struct attr tmp; |
b9f1dca1 | 774 | struct attr_extra tmp_extra; |
f6f434b2 | 775 | |
718e3744 | 776 | /* Decrement attribute reference. */ |
1a2fd707 | 777 | attr->refcnt--; |
b881c707 | 778 | |
1a2fd707 | 779 | tmp = *attr; |
b881c707 | 780 | |
1a2fd707 | 781 | if (attr->extra) |
fb982c25 | 782 | { |
b9f1dca1 | 783 | tmp.extra = &tmp_extra; |
1a2fd707 | 784 | memcpy (tmp.extra, attr->extra, sizeof (struct attr_extra)); |
fb982c25 | 785 | } |
f6f434b2 | 786 | |
718e3744 | 787 | /* If reference becomes zero then free attribute object. */ |
1a2fd707 JBD |
788 | if (attr->refcnt == 0) |
789 | { | |
790 | ret = hash_release (attrhash, attr); | |
718e3744 | 791 | assert (ret != NULL); |
1a2fd707 JBD |
792 | bgp_attr_extra_free (attr); |
793 | XFREE (MTYPE_ATTR, attr); | |
794 | *pattr = NULL; | |
718e3744 | 795 | } |
796 | ||
b881c707 | 797 | bgp_attr_unintern_sub (&tmp); |
718e3744 | 798 | } |
799 | ||
800 | void | |
801 | bgp_attr_flush (struct attr *attr) | |
802 | { | |
803 | if (attr->aspath && ! attr->aspath->refcnt) | |
804 | aspath_free (attr->aspath); | |
805 | if (attr->community && ! attr->community->refcnt) | |
806 | community_free (attr->community); | |
fb982c25 PJ |
807 | if (attr->extra) |
808 | { | |
809 | struct attr_extra *attre = attr->extra; | |
f6f434b2 | 810 | |
fb982c25 | 811 | if (attre->ecommunity && ! attre->ecommunity->refcnt) |
f6f434b2 | 812 | ecommunity_free (&attre->ecommunity); |
fb982c25 PJ |
813 | if (attre->cluster && ! attre->cluster->refcnt) |
814 | cluster_free (attre->cluster); | |
815 | if (attre->transit && ! attre->transit->refcnt) | |
816 | transit_free (attre->transit); | |
817 | } | |
718e3744 | 818 | } |
819 | ||
b881c707 PJ |
820 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
821 | * avoid resetting sessions for malformed attributes which are | |
822 | * are partial/optional and hence where the error likely was not | |
823 | * introduced by the sending neighbour. | |
824 | */ | |
825 | static bgp_attr_parse_ret_t | |
835315bf PJ |
826 | bgp_attr_malformed (struct bgp_attr_parser_args *args, u_char subcode, |
827 | bgp_size_t length) | |
b881c707 | 828 | { |
835315bf PJ |
829 | struct peer *const peer = args->peer; |
830 | const u_int8_t flags = args->flags; | |
831 | /* startp and length must be special-cased, as whether or not to | |
832 | * send the attribute data with the NOTIFY depends on the error, | |
833 | * the caller therefore signals this with the seperate length argument | |
834 | */ | |
bd471fea | 835 | u_char *notify_datap = (length > 0 ? args->startp : NULL); |
835315bf | 836 | |
b881c707 | 837 | /* Only relax error handling for eBGP peers */ |
6d85b15b | 838 | if (peer->sort != BGP_PEER_EBGP) |
b881c707 PJ |
839 | { |
840 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 841 | notify_datap, length); |
b881c707 PJ |
842 | return BGP_ATTR_PARSE_ERROR; |
843 | ||
844 | } | |
845 | ||
bd471fea PJ |
846 | /* Adjust the stream getp to the end of the attribute, in case we can |
847 | * still proceed but the caller hasn't read all the attribute. | |
848 | */ | |
849 | stream_set_getp (BGP_INPUT (peer), | |
850 | (args->startp - STREAM_DATA (BGP_INPUT (peer))) | |
851 | + args->total); | |
852 | ||
835315bf | 853 | switch (args->type) { |
fa61e16d PJ |
854 | /* where an attribute is relatively inconsequential, e.g. it does not |
855 | * affect route selection, and can be safely ignored, then any such | |
856 | * attributes which are malformed should just be ignored and the route | |
857 | * processed as normal. | |
b881c707 PJ |
858 | */ |
859 | case BGP_ATTR_AS4_AGGREGATOR: | |
860 | case BGP_ATTR_AGGREGATOR: | |
861 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
862 | return BGP_ATTR_PARSE_PROCEED; | |
863 | ||
864 | /* Core attributes, particularly ones which may influence route | |
fa61e16d | 865 | * selection, should always cause session resets |
b881c707 PJ |
866 | */ |
867 | case BGP_ATTR_ORIGIN: | |
868 | case BGP_ATTR_AS_PATH: | |
869 | case BGP_ATTR_NEXT_HOP: | |
870 | case BGP_ATTR_MULTI_EXIT_DISC: | |
871 | case BGP_ATTR_LOCAL_PREF: | |
872 | case BGP_ATTR_COMMUNITIES: | |
873 | case BGP_ATTR_ORIGINATOR_ID: | |
874 | case BGP_ATTR_CLUSTER_LIST: | |
875 | case BGP_ATTR_MP_REACH_NLRI: | |
876 | case BGP_ATTR_MP_UNREACH_NLRI: | |
877 | case BGP_ATTR_EXT_COMMUNITIES: | |
878 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 879 | notify_datap, length); |
b881c707 PJ |
880 | return BGP_ATTR_PARSE_ERROR; |
881 | } | |
882 | ||
883 | /* Partial optional attributes that are malformed should not cause | |
884 | * the whole session to be reset. Instead treat it as a withdrawal | |
885 | * of the routes, if possible. | |
886 | */ | |
835315bf PJ |
887 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS) |
888 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
889 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
b881c707 PJ |
890 | return BGP_ATTR_PARSE_WITHDRAW; |
891 | ||
892 | /* default to reset */ | |
f57000c0 | 893 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
b881c707 PJ |
894 | } |
895 | ||
afcb7679 DO |
896 | /* Find out what is wrong with the path attribute flag bits and log the error. |
897 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
898 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
899 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
900 | non-transitive" attribute. */ | |
901 | static void | |
835315bf PJ |
902 | bgp_attr_flags_diagnose (struct bgp_attr_parser_args *args, |
903 | u_int8_t desired_flags /* how RFC says it must be */ | |
afcb7679 DO |
904 | ) |
905 | { | |
906 | u_char seen = 0, i; | |
835315bf PJ |
907 | u_char real_flags = args->flags; |
908 | const u_int8_t attr_code = args->type; | |
909 | ||
afcb7679 DO |
910 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; |
911 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
912 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
913 | if | |
914 | ( | |
915 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) != | |
916 | CHECK_FLAG (real_flags, attr_flag_str[i].key) | |
917 | ) | |
918 | { | |
16286195 DS |
919 | zlog_err ("%s attribute must%s be flagged as \"%s\"", |
920 | LOOKUP (attr_str, attr_code), | |
921 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) ? "" : " not", | |
922 | attr_flag_str[i].str); | |
afcb7679 DO |
923 | seen = 1; |
924 | } | |
fa5831e8 PJ |
925 | if (!seen) |
926 | { | |
16286195 DS |
927 | zlog_debug ("Strange, %s called for attr %s, but no problem found with flags" |
928 | " (real flags 0x%x, desired 0x%x)", | |
929 | __func__, LOOKUP (attr_str, attr_code), | |
930 | real_flags, desired_flags); | |
fa5831e8 | 931 | } |
afcb7679 DO |
932 | } |
933 | ||
3ecab4c8 PJ |
934 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
935 | * as will PARTIAL for optional+transitive attributes. | |
936 | */ | |
937 | const u_int8_t attr_flags_values [] = { | |
938 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
939 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
940 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
941 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
942 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
943 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
944 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
945 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
946 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
947 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
948 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
949 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
950 | [BGP_ATTR_EXT_COMMUNITIES] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
951 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
952 | [BGP_ATTR_AS4_AGGREGATOR] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
953 | }; | |
954 | static const size_t attr_flags_values_max = | |
955 | sizeof (attr_flags_values) / sizeof (attr_flags_values[0]); | |
956 | ||
957 | static int | |
835315bf | 958 | bgp_attr_flag_invalid (struct bgp_attr_parser_args *args) |
3ecab4c8 PJ |
959 | { |
960 | u_int8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
835315bf PJ |
961 | const u_int8_t flags = args->flags; |
962 | const u_int8_t attr_code = args->type; | |
3ecab4c8 PJ |
963 | |
964 | /* there may be attributes we don't know about */ | |
965 | if (attr_code > attr_flags_values_max) | |
966 | return 0; | |
967 | if (attr_flags_values[attr_code] == 0) | |
968 | return 0; | |
969 | ||
970 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set to | |
971 | * 1." | |
972 | */ | |
973 | if (!CHECK_FLAG (BGP_ATTR_FLAG_OPTIONAL, flags) | |
974 | && !CHECK_FLAG (BGP_ATTR_FLAG_TRANS, flags)) | |
975 | { | |
16286195 DS |
976 | zlog_err ("%s well-known attributes must have transitive flag set (%x)", |
977 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
978 | return 1; |
979 | } | |
980 | ||
981 | /* "For well-known attributes and for optional non-transitive attributes, | |
982 | * the Partial bit MUST be set to 0." | |
983 | */ | |
984 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
985 | { | |
986 | if (!CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL)) | |
987 | { | |
16286195 DS |
988 | zlog_err ("%s well-known attribute " |
989 | "must NOT have the partial flag set (%x)", | |
990 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
991 | return 1; |
992 | } | |
993 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
994 | && !CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
995 | { | |
16286195 DS |
996 | zlog_err ("%s optional + transitive attribute " |
997 | "must NOT have the partial flag set (%x)", | |
998 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
999 | return 1; |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* Optional transitive attributes may go through speakers that don't | |
1004 | * reocgnise them and set the Partial bit. | |
1005 | */ | |
1006 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1007 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1008 | SET_FLAG (mask, BGP_ATTR_FLAG_PARTIAL); | |
1009 | ||
683f2b86 | 1010 | if ((flags & ~mask) |
3ecab4c8 PJ |
1011 | == attr_flags_values[attr_code]) |
1012 | return 0; | |
1013 | ||
835315bf | 1014 | bgp_attr_flags_diagnose (args, attr_flags_values[attr_code]); |
3ecab4c8 PJ |
1015 | return 1; |
1016 | } | |
1017 | ||
718e3744 | 1018 | /* Get origin attribute of the update message. */ |
b881c707 | 1019 | static bgp_attr_parse_ret_t |
835315bf | 1020 | bgp_attr_origin (struct bgp_attr_parser_args *args) |
718e3744 | 1021 | { |
835315bf PJ |
1022 | struct peer *const peer = args->peer; |
1023 | struct attr *const attr = args->attr; | |
1024 | const bgp_size_t length = args->length; | |
1025 | ||
718e3744 | 1026 | /* If any recognized attribute has Attribute Length that conflicts |
1027 | with the expected length (based on the attribute type code), then | |
1028 | the Error Subcode is set to Attribute Length Error. The Data | |
1029 | field contains the erroneous attribute (type, length and | |
1030 | value). */ | |
1031 | if (length != 1) | |
1032 | { | |
16286195 | 1033 | zlog_err ("Origin attribute length is not one %d", length); |
835315bf | 1034 | return bgp_attr_malformed (args, |
b881c707 | 1035 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1036 | args->total); |
718e3744 | 1037 | } |
1038 | ||
1039 | /* Fetch origin attribute. */ | |
1040 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
1041 | ||
1042 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1043 | Subcode is set to Invalid Origin Attribute. The Data field | |
1044 | contains the unrecognized attribute (type, length and value). */ | |
1045 | if ((attr->origin != BGP_ORIGIN_IGP) | |
1046 | && (attr->origin != BGP_ORIGIN_EGP) | |
1047 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
1048 | { | |
16286195 | 1049 | zlog_err ("Origin attribute value is invalid %d", attr->origin); |
835315bf | 1050 | return bgp_attr_malformed (args, |
b881c707 | 1051 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
835315bf | 1052 | args->total); |
718e3744 | 1053 | } |
1054 | ||
1055 | /* Set oring attribute flag. */ | |
1056 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
ab005298 PJ |
1060 | |
1061 | /* Parse AS path information. This function is wrapper of | |
1062 | aspath_parse. */ | |
1063 | static int | |
835315bf | 1064 | bgp_attr_aspath (struct bgp_attr_parser_args *args) |
718e3744 | 1065 | { |
835315bf PJ |
1066 | struct attr *const attr = args->attr; |
1067 | struct peer *const peer = args->peer; | |
1068 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1069 | |
ab005298 PJ |
1070 | /* |
1071 | * peer with AS4 => will get 4Byte ASnums | |
1072 | * otherwise, will get 16 Bit | |
0b2aa3a0 | 1073 | */ |
ab005298 PJ |
1074 | attr->aspath = aspath_parse (peer->ibuf, length, |
1075 | CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)); | |
0b2aa3a0 | 1076 | |
ab005298 PJ |
1077 | /* In case of IBGP, length will be zero. */ |
1078 | if (! attr->aspath) | |
cddb8112 | 1079 | { |
16286195 | 1080 | zlog_err ("Malformed AS path from %s, length is %d", peer->host, length); |
835315bf | 1081 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, 0); |
cddb8112 | 1082 | } |
cddb8112 | 1083 | |
ab005298 PJ |
1084 | /* Set aspath attribute flag. */ |
1085 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
0b2aa3a0 | 1086 | |
b881c707 | 1087 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1088 | } |
1089 | ||
b881c707 | 1090 | static bgp_attr_parse_ret_t |
835315bf | 1091 | bgp_attr_aspath_check (struct peer *const peer, struct attr *const attr) |
0b2aa3a0 PJ |
1092 | { |
1093 | /* These checks were part of bgp_attr_aspath, but with | |
1094 | * as4 we should to check aspath things when | |
1095 | * aspath synthesizing with as4_path has already taken place. | |
1096 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1097 | * not right. | |
1098 | * So do the checks later, i.e. here | |
1099 | */ | |
1100 | struct bgp *bgp = peer->bgp; | |
1101 | struct aspath *aspath; | |
1102 | ||
ca87e1d3 | 1103 | /* Confederation sanity check. */ |
6d85b15b JBD |
1104 | if ((peer->sort == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) || |
1105 | (peer->sort == BGP_PEER_EBGP && aspath_confed_check (attr->aspath))) | |
ca87e1d3 | 1106 | { |
16286195 | 1107 | zlog_err ("Malformed AS path from %s", peer->host); |
835315bf PJ |
1108 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1109 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1110 | return BGP_ATTR_PARSE_ERROR; | |
ca87e1d3 VT |
1111 | } |
1112 | ||
718e3744 | 1113 | /* First AS check for EBGP. */ |
1114 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
1115 | { | |
6d85b15b | 1116 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 1117 | && ! aspath_firstas_check (attr->aspath, peer->as)) |
1118 | { | |
16286195 | 1119 | zlog_err ("%s incorrect first AS (must be %u)", peer->host, peer->as); |
835315bf PJ |
1120 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1121 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1122 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 1123 | } |
1124 | } | |
1125 | ||
1126 | /* local-as prepend */ | |
1127 | if (peer->change_local_as && | |
1128 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
1129 | { | |
1130 | aspath = aspath_dup (attr->aspath); | |
1131 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
f6f434b2 | 1132 | aspath_unintern (&attr->aspath); |
718e3744 | 1133 | attr->aspath = aspath_intern (aspath); |
1134 | } | |
1135 | ||
b881c707 | 1136 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1137 | } |
1138 | ||
ab005298 PJ |
1139 | /* Parse AS4 path information. This function is another wrapper of |
1140 | aspath_parse. */ | |
1141 | static int | |
835315bf | 1142 | bgp_attr_as4_path (struct bgp_attr_parser_args *args, struct aspath **as4_path) |
ab005298 | 1143 | { |
835315bf PJ |
1144 | struct peer *const peer = args->peer; |
1145 | struct attr *const attr = args->attr; | |
1146 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1147 | |
ab005298 PJ |
1148 | *as4_path = aspath_parse (peer->ibuf, length, 1); |
1149 | ||
b881c707 PJ |
1150 | /* In case of IBGP, length will be zero. */ |
1151 | if (!*as4_path) | |
1152 | { | |
16286195 | 1153 | zlog_err ("Malformed AS4 path from %s, length is %d", peer->host, length); |
835315bf | 1154 | return bgp_attr_malformed (args, |
b881c707 | 1155 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
835315bf | 1156 | 0); |
b881c707 PJ |
1157 | } |
1158 | ||
ab005298 PJ |
1159 | /* Set aspath attribute flag. */ |
1160 | if (as4_path) | |
1161 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_PATH); | |
1162 | ||
b881c707 | 1163 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1164 | } |
1165 | ||
718e3744 | 1166 | /* Nexthop attribute. */ |
b881c707 | 1167 | static bgp_attr_parse_ret_t |
835315bf | 1168 | bgp_attr_nexthop (struct bgp_attr_parser_args *args) |
718e3744 | 1169 | { |
835315bf PJ |
1170 | struct peer *const peer = args->peer; |
1171 | struct attr *const attr = args->attr; | |
1172 | const bgp_size_t length = args->length; | |
1173 | ||
bc3443eb | 1174 | in_addr_t nexthop_h, nexthop_n; |
718e3744 | 1175 | |
718e3744 | 1176 | /* Check nexthop attribute length. */ |
1177 | if (length != 4) | |
1178 | { | |
16286195 | 1179 | zlog_err ("Nexthop attribute length isn't four [%d]", length); |
718e3744 | 1180 | |
835315bf | 1181 | return bgp_attr_malformed (args, |
b881c707 | 1182 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1183 | args->total); |
718e3744 | 1184 | } |
1185 | ||
58298ccd DS |
1186 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP |
1187 | attribute must result in a NOTIFICATION message (this is implemented below). | |
1188 | At the same time, semantically incorrect NEXT_HOP is more likely to be just | |
1189 | logged locally (this is implemented somewhere else). The UPDATE message | |
1190 | gets ignored in any of these cases. */ | |
bc3443eb DO |
1191 | nexthop_n = stream_get_ipv4 (peer->ibuf); |
1192 | nexthop_h = ntohl (nexthop_n); | |
58298ccd | 1193 | if (IPV4_NET0 (nexthop_h) || IPV4_NET127 (nexthop_h) || IPV4_CLASS_DE (nexthop_h)) |
bc3443eb DO |
1194 | { |
1195 | char buf[INET_ADDRSTRLEN]; | |
bb02b823 | 1196 | inet_ntop (AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); |
16286195 | 1197 | zlog_err ("Martian nexthop %s", buf); |
835315bf | 1198 | return bgp_attr_malformed (args, |
bc3443eb | 1199 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, |
835315bf | 1200 | args->total); |
bc3443eb DO |
1201 | } |
1202 | ||
1203 | attr->nexthop.s_addr = nexthop_n; | |
718e3744 | 1204 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
1205 | ||
b881c707 | 1206 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1207 | } |
1208 | ||
1209 | /* MED atrribute. */ | |
b881c707 | 1210 | static bgp_attr_parse_ret_t |
835315bf | 1211 | bgp_attr_med (struct bgp_attr_parser_args *args) |
718e3744 | 1212 | { |
835315bf PJ |
1213 | struct peer *const peer = args->peer; |
1214 | struct attr *const attr = args->attr; | |
1215 | const bgp_size_t length = args->length; | |
1216 | ||
718e3744 | 1217 | /* Length check. */ |
1218 | if (length != 4) | |
1219 | { | |
16286195 | 1220 | zlog_err ("MED attribute length isn't four [%d]", length); |
b881c707 | 1221 | |
835315bf | 1222 | return bgp_attr_malformed (args, |
b881c707 | 1223 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1224 | args->total); |
718e3744 | 1225 | } |
1226 | ||
1227 | attr->med = stream_getl (peer->ibuf); | |
1228 | ||
1229 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
1230 | ||
b881c707 | 1231 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1232 | } |
1233 | ||
1234 | /* Local preference attribute. */ | |
b881c707 | 1235 | static bgp_attr_parse_ret_t |
835315bf | 1236 | bgp_attr_local_pref (struct bgp_attr_parser_args *args) |
718e3744 | 1237 | { |
835315bf PJ |
1238 | struct peer *const peer = args->peer; |
1239 | struct attr *const attr = args->attr; | |
1240 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1241 | |
a624cae2 DO |
1242 | /* Length check. */ |
1243 | if (length != 4) | |
1244 | { | |
16286195 | 1245 | zlog_err ("LOCAL_PREF attribute length isn't 4 [%u]", length); |
835315bf | 1246 | return bgp_attr_malformed (args, |
a624cae2 | 1247 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1248 | args->total); |
a624cae2 | 1249 | } |
0ea968d2 | 1250 | |
718e3744 | 1251 | /* If it is contained in an UPDATE message that is received from an |
1252 | external peer, then this attribute MUST be ignored by the | |
1253 | receiving speaker. */ | |
6d85b15b | 1254 | if (peer->sort == BGP_PEER_EBGP) |
718e3744 | 1255 | { |
9985f83c | 1256 | stream_forward_getp (peer->ibuf, length); |
b881c707 | 1257 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1258 | } |
1259 | ||
a624cae2 | 1260 | attr->local_pref = stream_getl (peer->ibuf); |
718e3744 | 1261 | |
1262 | /* Set atomic aggregate flag. */ | |
1263 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
1264 | ||
b881c707 | 1265 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1266 | } |
1267 | ||
1268 | /* Atomic aggregate. */ | |
94f2b392 | 1269 | static int |
835315bf | 1270 | bgp_attr_atomic (struct bgp_attr_parser_args *args) |
718e3744 | 1271 | { |
835315bf PJ |
1272 | struct attr *const attr = args->attr; |
1273 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1274 | |
9eba2ada | 1275 | /* Length check. */ |
718e3744 | 1276 | if (length != 0) |
1277 | { | |
16286195 | 1278 | zlog_err ("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", length); |
835315bf | 1279 | return bgp_attr_malformed (args, |
b881c707 | 1280 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1281 | args->total); |
718e3744 | 1282 | } |
1283 | ||
1284 | /* Set atomic aggregate flag. */ | |
1285 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
1286 | ||
b881c707 | 1287 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1288 | } |
1289 | ||
1290 | /* Aggregator attribute */ | |
94f2b392 | 1291 | static int |
835315bf | 1292 | bgp_attr_aggregator (struct bgp_attr_parser_args *args) |
718e3744 | 1293 | { |
835315bf PJ |
1294 | struct peer *const peer = args->peer; |
1295 | struct attr *const attr = args->attr; | |
1296 | const bgp_size_t length = args->length; | |
1297 | ||
0b2aa3a0 | 1298 | int wantedlen = 6; |
fb982c25 | 1299 | struct attr_extra *attre = bgp_attr_extra_get (attr); |
3ecab4c8 | 1300 | |
0b2aa3a0 | 1301 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ |
b881c707 | 1302 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1303 | wantedlen = 8; |
1304 | ||
1305 | if (length != wantedlen) | |
718e3744 | 1306 | { |
16286195 | 1307 | zlog_err ("AGGREGATOR attribute length isn't %u [%u]", wantedlen, length); |
835315bf | 1308 | return bgp_attr_malformed (args, |
b881c707 | 1309 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1310 | args->total); |
718e3744 | 1311 | } |
0b2aa3a0 PJ |
1312 | |
1313 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
1314 | attre->aggregator_as = stream_getl (peer->ibuf); | |
1315 | else | |
1316 | attre->aggregator_as = stream_getw (peer->ibuf); | |
fb982c25 | 1317 | attre->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); |
718e3744 | 1318 | |
1319 | /* Set atomic aggregate flag. */ | |
1320 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1321 | ||
b881c707 | 1322 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1323 | } |
1324 | ||
0b2aa3a0 | 1325 | /* New Aggregator attribute */ |
b881c707 | 1326 | static bgp_attr_parse_ret_t |
835315bf PJ |
1327 | bgp_attr_as4_aggregator (struct bgp_attr_parser_args *args, |
1328 | as_t *as4_aggregator_as, | |
1329 | struct in_addr *as4_aggregator_addr) | |
0b2aa3a0 | 1330 | { |
835315bf PJ |
1331 | struct peer *const peer = args->peer; |
1332 | struct attr *const attr = args->attr; | |
1333 | const bgp_size_t length = args->length; | |
1334 | ||
0b2aa3a0 PJ |
1335 | if (length != 8) |
1336 | { | |
16286195 | 1337 | zlog_err ("New Aggregator length is not 8 [%d]", length); |
835315bf | 1338 | return bgp_attr_malformed (args, |
b881c707 | 1339 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1340 | 0); |
0b2aa3a0 | 1341 | } |
3ecab4c8 | 1342 | |
0b2aa3a0 PJ |
1343 | *as4_aggregator_as = stream_getl (peer->ibuf); |
1344 | as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf); | |
1345 | ||
1346 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR); | |
1347 | ||
b881c707 | 1348 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1349 | } |
1350 | ||
1351 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1352 | */ | |
b881c707 | 1353 | static bgp_attr_parse_ret_t |
835315bf PJ |
1354 | bgp_attr_munge_as4_attrs (struct peer *const peer, |
1355 | struct attr *const attr, | |
0b2aa3a0 PJ |
1356 | struct aspath *as4_path, as_t as4_aggregator, |
1357 | struct in_addr *as4_aggregator_addr) | |
1358 | { | |
1359 | int ignore_as4_path = 0; | |
1360 | struct aspath *newpath; | |
1361 | struct attr_extra *attre = attr->extra; | |
1362 | ||
b881c707 | 1363 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1364 | { |
1365 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1366 | * if given. | |
1367 | * It is worth a warning though, because the peer really | |
1368 | * should not send them | |
1369 | */ | |
1370 | if (BGP_DEBUG(as4, AS4)) | |
1371 | { | |
1372 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1373 | zlog_debug ("[AS4] %s %s AS4_PATH", | |
1374 | peer->host, "AS4 capable peer, yet it sent"); | |
1375 | ||
1376 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1377 | zlog_debug ("[AS4] %s %s AS4_AGGREGATOR", | |
1378 | peer->host, "AS4 capable peer, yet it sent"); | |
1379 | } | |
1380 | ||
b881c707 | 1381 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1382 | } |
1383 | ||
0b2aa3a0 PJ |
1384 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR |
1385 | * because that may override AS4_PATH | |
1386 | */ | |
1387 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) ) | |
1388 | { | |
b881c707 | 1389 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) ) |
0b2aa3a0 | 1390 | { |
370b64a2 PJ |
1391 | assert (attre); |
1392 | ||
0b2aa3a0 PJ |
1393 | /* received both. |
1394 | * if the as_number in aggregator is not AS_TRANS, | |
1395 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1396 | * and the Aggregator shall be taken as | |
1397 | * info on the aggregating node, and the AS_PATH | |
1398 | * shall be taken as the AS_PATH | |
1399 | * otherwise | |
1400 | * the Aggregator shall be ignored and the | |
1401 | * AS4_AGGREGATOR shall be taken as the | |
1402 | * Aggregating node and the AS_PATH is to be | |
1403 | * constructed "as in all other cases" | |
1404 | */ | |
b881c707 | 1405 | if (attre->aggregator_as != BGP_AS_TRANS) |
0b2aa3a0 PJ |
1406 | { |
1407 | /* ignore */ | |
1408 | if ( BGP_DEBUG(as4, AS4)) | |
1409 | zlog_debug ("[AS4] %s BGP not AS4 capable peer" | |
1410 | " send AGGREGATOR != AS_TRANS and" | |
1411 | " AS4_AGGREGATOR, so ignore" | |
1412 | " AS4_AGGREGATOR and AS4_PATH", peer->host); | |
1413 | ignore_as4_path = 1; | |
1414 | } | |
1415 | else | |
1416 | { | |
1417 | /* "New_aggregator shall be taken as aggregator" */ | |
1418 | attre->aggregator_as = as4_aggregator; | |
1419 | attre->aggregator_addr.s_addr = as4_aggregator_addr->s_addr; | |
1420 | } | |
1421 | } | |
1422 | else | |
1423 | { | |
1424 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1425 | * That is bogus - but reading the conditions | |
1426 | * we have to handle AS4_AGGREGATOR as if it were | |
1427 | * AGGREGATOR in that case | |
1428 | */ | |
1429 | if ( BGP_DEBUG(as4, AS4)) | |
1430 | zlog_debug ("[AS4] %s BGP not AS4 capable peer send" | |
1431 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1432 | " it as if AGGREGATOR with AS_TRANS had been there", peer->host); | |
370b64a2 | 1433 | (attre = bgp_attr_extra_get (attr))->aggregator_as = as4_aggregator; |
0b2aa3a0 PJ |
1434 | /* sweep it under the carpet and simulate a "good" AGGREGATOR */ |
1435 | attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)); | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
b881c707 | 1440 | if (!ignore_as4_path && (attr->flag & (ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH)))) |
0b2aa3a0 | 1441 | { |
f47e5a18 DL |
1442 | if (!attr->aspath) |
1443 | return BGP_ATTR_PARSE_PROCEED; | |
1444 | ||
0b2aa3a0 | 1445 | newpath = aspath_reconcile_as4 (attr->aspath, as4_path); |
f6f434b2 | 1446 | aspath_unintern (&attr->aspath); |
0b2aa3a0 PJ |
1447 | attr->aspath = aspath_intern (newpath); |
1448 | } | |
b881c707 | 1449 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1450 | } |
1451 | ||
718e3744 | 1452 | /* Community attribute. */ |
b881c707 | 1453 | static bgp_attr_parse_ret_t |
835315bf | 1454 | bgp_attr_community (struct bgp_attr_parser_args *args) |
718e3744 | 1455 | { |
835315bf PJ |
1456 | struct peer *const peer = args->peer; |
1457 | struct attr *const attr = args->attr; | |
1458 | const bgp_size_t length = args->length; | |
b881c707 | 1459 | |
718e3744 | 1460 | if (length == 0) |
b2ceea18 PJ |
1461 | { |
1462 | attr->community = NULL; | |
b881c707 | 1463 | return BGP_ATTR_PARSE_PROCEED; |
b2ceea18 | 1464 | } |
0c466381 PJ |
1465 | |
1466 | attr->community = | |
1467 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
1468 | ||
1469 | /* XXX: fix community_parse to use stream API and remove this */ | |
1470 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1471 | |
0c466381 | 1472 | if (!attr->community) |
835315bf | 1473 | return bgp_attr_malformed (args, |
b881c707 | 1474 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
835315bf | 1475 | args->total); |
0c466381 | 1476 | |
718e3744 | 1477 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); |
1478 | ||
b881c707 | 1479 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1480 | } |
1481 | ||
1482 | /* Originator ID attribute. */ | |
b881c707 | 1483 | static bgp_attr_parse_ret_t |
835315bf | 1484 | bgp_attr_originator_id (struct bgp_attr_parser_args *args) |
718e3744 | 1485 | { |
835315bf PJ |
1486 | struct peer *const peer = args->peer; |
1487 | struct attr *const attr = args->attr; | |
1488 | const bgp_size_t length = args->length; | |
1489 | ||
d595b566 | 1490 | /* Length check. */ |
718e3744 | 1491 | if (length != 4) |
1492 | { | |
16286195 | 1493 | zlog_err ("Bad originator ID length %d", length); |
718e3744 | 1494 | |
835315bf | 1495 | return bgp_attr_malformed (args, |
b881c707 | 1496 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1497 | args->total); |
718e3744 | 1498 | } |
1499 | ||
fb982c25 PJ |
1500 | (bgp_attr_extra_get (attr))->originator_id.s_addr |
1501 | = stream_get_ipv4 (peer->ibuf); | |
718e3744 | 1502 | |
1503 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
1504 | ||
b881c707 | 1505 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1506 | } |
1507 | ||
1508 | /* Cluster list attribute. */ | |
b881c707 | 1509 | static bgp_attr_parse_ret_t |
835315bf | 1510 | bgp_attr_cluster_list (struct bgp_attr_parser_args *args) |
718e3744 | 1511 | { |
835315bf PJ |
1512 | struct peer *const peer = args->peer; |
1513 | struct attr *const attr = args->attr; | |
1514 | const bgp_size_t length = args->length; | |
1515 | ||
718e3744 | 1516 | /* Check length. */ |
1517 | if (length % 4) | |
1518 | { | |
16286195 | 1519 | zlog_err ("Bad cluster list length %d", length); |
718e3744 | 1520 | |
835315bf PJ |
1521 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1522 | args->total); | |
718e3744 | 1523 | } |
1524 | ||
fb982c25 PJ |
1525 | (bgp_attr_extra_get (attr))->cluster |
1526 | = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length); | |
b881c707 PJ |
1527 | |
1528 | /* XXX: Fix cluster_parse to use stream API and then remove this */ | |
1529 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1530 | |
1531 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
1532 | ||
b881c707 | 1533 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1534 | } |
1535 | ||
1536 | /* Multiprotocol reachability information parse. */ | |
03292809 | 1537 | int |
835315bf PJ |
1538 | bgp_mp_reach_parse (struct bgp_attr_parser_args *args, |
1539 | struct bgp_nlri *mp_update) | |
718e3744 | 1540 | { |
4c9641ba ML |
1541 | afi_t afi; |
1542 | safi_t safi; | |
718e3744 | 1543 | bgp_size_t nlri_len; |
6e4ab12f | 1544 | size_t start; |
718e3744 | 1545 | int ret; |
d889623f | 1546 | int num_mp_pfx = 0; |
718e3744 | 1547 | struct stream *s; |
835315bf PJ |
1548 | struct peer *const peer = args->peer; |
1549 | struct attr *const attr = args->attr; | |
1550 | const bgp_size_t length = args->length; | |
fb982c25 | 1551 | struct attr_extra *attre = bgp_attr_extra_get(attr); |
835315bf | 1552 | |
718e3744 | 1553 | /* Set end of packet. */ |
6e4ab12f PJ |
1554 | s = BGP_INPUT(peer); |
1555 | start = stream_get_getp(s); | |
1556 | ||
1557 | /* safe to read statically sized header? */ | |
1558 | #define BGP_MP_REACH_MIN_SIZE 5 | |
03292809 | 1559 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
6e4ab12f | 1560 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) |
03292809 PJ |
1561 | { |
1562 | zlog_info ("%s: %s sent invalid length, %lu", | |
1563 | __func__, peer->host, (unsigned long)length); | |
f57000c0 | 1564 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1565 | } |
6e4ab12f | 1566 | |
718e3744 | 1567 | /* Load AFI, SAFI. */ |
1568 | afi = stream_getw (s); | |
1569 | safi = stream_getc (s); | |
1570 | ||
1571 | /* Get nexthop length. */ | |
fb982c25 | 1572 | attre->mp_nexthop_len = stream_getc (s); |
6e4ab12f | 1573 | |
03292809 PJ |
1574 | if (LEN_LEFT < attre->mp_nexthop_len) |
1575 | { | |
1576 | zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1577 | __func__, peer->host, attre->mp_nexthop_len); | |
f57000c0 | 1578 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1579 | } |
6e4ab12f | 1580 | |
718e3744 | 1581 | /* Nexthop length check. */ |
fb982c25 | 1582 | switch (attre->mp_nexthop_len) |
718e3744 | 1583 | { |
801a9bcc DS |
1584 | case BGP_ATTR_NHLEN_IPV4: |
1585 | stream_get (&attre->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
66bed4f4 ML |
1586 | /* Probably needed for RFC 2283 */ |
1587 | if (attr->nexthop.s_addr == 0) | |
801a9bcc | 1588 | memcpy(&attr->nexthop.s_addr, &attre->mp_nexthop_global_in, IPV4_MAX_BYTELEN); |
718e3744 | 1589 | break; |
801a9bcc | 1590 | case BGP_ATTR_NHLEN_VPNV4: |
9206f9ec SH |
1591 | stream_getl (s); /* RD high */ |
1592 | stream_getl (s); /* RD low */ | |
801a9bcc | 1593 | stream_get (&attre->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); |
718e3744 | 1594 | break; |
1595 | #ifdef HAVE_IPV6 | |
801a9bcc DS |
1596 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
1597 | stream_get (&attre->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
718e3744 | 1598 | break; |
801a9bcc DS |
1599 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: |
1600 | stream_get (&attre->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1601 | stream_get (&attre->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
fb982c25 | 1602 | if (! IN6_IS_ADDR_LINKLOCAL (&attre->mp_nexthop_local)) |
718e3744 | 1603 | { |
1604 | char buf1[INET6_ADDRSTRLEN]; | |
1605 | char buf2[INET6_ADDRSTRLEN]; | |
1606 | ||
3f9c7369 | 1607 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3dd32081 DS |
1608 | zlog_debug ("%s rcvd nexthops %s, %s -- ignoring non-LL value", |
1609 | peer->host, | |
fb982c25 | 1610 | inet_ntop (AF_INET6, &attre->mp_nexthop_global, |
718e3744 | 1611 | buf1, INET6_ADDRSTRLEN), |
fb982c25 | 1612 | inet_ntop (AF_INET6, &attre->mp_nexthop_local, |
718e3744 | 1613 | buf2, INET6_ADDRSTRLEN)); |
1614 | ||
801a9bcc | 1615 | attre->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 1616 | } |
1617 | break; | |
1618 | #endif /* HAVE_IPV6 */ | |
1619 | default: | |
03292809 PJ |
1620 | zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d", |
1621 | __func__, peer->host, attre->mp_nexthop_len); | |
f57000c0 | 1622 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
718e3744 | 1623 | } |
1624 | ||
03292809 PJ |
1625 | if (!LEN_LEFT) |
1626 | { | |
1627 | zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)", | |
1628 | __func__, peer->host); | |
f57000c0 | 1629 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1630 | } |
718e3744 | 1631 | |
6e4ab12f PJ |
1632 | { |
1633 | u_char val; | |
1634 | if ((val = stream_getc (s))) | |
1635 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
1636 | peer->host, val); | |
1637 | } | |
1638 | ||
1639 | /* must have nrli_len, what is left of the attribute */ | |
03292809 | 1640 | nlri_len = LEN_LEFT; |
6e4ab12f | 1641 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) |
03292809 PJ |
1642 | { |
1643 | zlog_info ("%s: (%s) Failed to read NLRI", | |
1644 | __func__, peer->host); | |
f57000c0 | 1645 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1646 | } |
718e3744 | 1647 | |
42e6d745 | 1648 | if (safi != SAFI_MPLS_LABELED_VPN) |
718e3744 | 1649 | { |
a82478b9 DS |
1650 | ret = bgp_nlri_sanity_check (peer, afi, safi, stream_pnt (s), |
1651 | nlri_len, &num_mp_pfx); | |
03292809 PJ |
1652 | if (ret < 0) |
1653 | { | |
1654 | zlog_info ("%s: (%s) NLRI doesn't pass sanity check", | |
1655 | __func__, peer->host); | |
f57000c0 | 1656 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1657 | } |
718e3744 | 1658 | } |
1659 | ||
1660 | mp_update->afi = afi; | |
1661 | mp_update->safi = safi; | |
1662 | mp_update->nlri = stream_pnt (s); | |
1663 | mp_update->length = nlri_len; | |
1664 | ||
9985f83c | 1665 | stream_forward_getp (s, nlri_len); |
718e3744 | 1666 | |
b881c707 | 1667 | return BGP_ATTR_PARSE_PROCEED; |
03292809 | 1668 | #undef LEN_LEFT |
718e3744 | 1669 | } |
1670 | ||
1671 | /* Multiprotocol unreachable parse */ | |
03292809 | 1672 | int |
835315bf | 1673 | bgp_mp_unreach_parse (struct bgp_attr_parser_args *args, |
718e3744 | 1674 | struct bgp_nlri *mp_withdraw) |
1675 | { | |
1676 | struct stream *s; | |
4c9641ba ML |
1677 | afi_t afi; |
1678 | safi_t safi; | |
718e3744 | 1679 | u_int16_t withdraw_len; |
1680 | int ret; | |
d889623f | 1681 | int num_mp_pfx = 0; |
835315bf PJ |
1682 | struct peer *const peer = args->peer; |
1683 | const bgp_size_t length = args->length; | |
718e3744 | 1684 | |
1685 | s = peer->ibuf; | |
6e4ab12f PJ |
1686 | |
1687 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
1688 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
f57000c0 | 1689 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
6e4ab12f | 1690 | |
718e3744 | 1691 | afi = stream_getw (s); |
1692 | safi = stream_getc (s); | |
6e4ab12f PJ |
1693 | |
1694 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; | |
718e3744 | 1695 | |
42e6d745 | 1696 | if (safi != SAFI_MPLS_LABELED_VPN) |
718e3744 | 1697 | { |
a82478b9 DS |
1698 | ret = bgp_nlri_sanity_check (peer, afi, safi, stream_pnt (s), |
1699 | withdraw_len, &num_mp_pfx); | |
718e3744 | 1700 | if (ret < 0) |
f57000c0 | 1701 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
718e3744 | 1702 | } |
1703 | ||
1704 | mp_withdraw->afi = afi; | |
1705 | mp_withdraw->safi = safi; | |
1706 | mp_withdraw->nlri = stream_pnt (s); | |
1707 | mp_withdraw->length = withdraw_len; | |
1708 | ||
9985f83c | 1709 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1710 | |
b881c707 | 1711 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1712 | } |
1713 | ||
1714 | /* Extended Community attribute. */ | |
b881c707 | 1715 | static bgp_attr_parse_ret_t |
835315bf | 1716 | bgp_attr_ext_communities (struct bgp_attr_parser_args *args) |
718e3744 | 1717 | { |
835315bf PJ |
1718 | struct peer *const peer = args->peer; |
1719 | struct attr *const attr = args->attr; | |
1720 | const bgp_size_t length = args->length; | |
b881c707 | 1721 | |
718e3744 | 1722 | if (length == 0) |
fb982c25 PJ |
1723 | { |
1724 | if (attr->extra) | |
1725 | attr->extra->ecommunity = NULL; | |
0c466381 | 1726 | /* Empty extcomm doesn't seem to be invalid per se */ |
b881c707 | 1727 | return BGP_ATTR_PARSE_PROCEED; |
fb982c25 | 1728 | } |
0c466381 PJ |
1729 | |
1730 | (bgp_attr_extra_get (attr))->ecommunity = | |
1731 | ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); | |
1732 | /* XXX: fix ecommunity_parse to use stream API */ | |
1733 | stream_forward_getp (peer->ibuf, length); | |
1734 | ||
1735 | if (!attr->extra->ecommunity) | |
835315bf PJ |
1736 | return bgp_attr_malformed (args, |
1737 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1738 | args->total); | |
0c466381 | 1739 | |
718e3744 | 1740 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); |
1741 | ||
b881c707 | 1742 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1743 | } |
1744 | ||
1745 | /* BGP unknown attribute treatment. */ | |
b881c707 | 1746 | static bgp_attr_parse_ret_t |
835315bf | 1747 | bgp_attr_unknown (struct bgp_attr_parser_args *args) |
718e3744 | 1748 | { |
8794e8d2 | 1749 | bgp_size_t total = args->total; |
718e3744 | 1750 | struct transit *transit; |
fb982c25 | 1751 | struct attr_extra *attre; |
835315bf PJ |
1752 | struct peer *const peer = args->peer; |
1753 | struct attr *const attr = args->attr; | |
1754 | u_char *const startp = args->startp; | |
1755 | const u_char type = args->type; | |
1756 | const u_char flag = args->flags; | |
1757 | const bgp_size_t length = args->length; | |
1758 | ||
3f9c7369 | 1759 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
16286195 DS |
1760 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", |
1761 | peer->host, type, length); | |
f418446b | 1762 | |
718e3744 | 1763 | /* Forward read pointer of input stream. */ |
9985f83c | 1764 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1765 | |
718e3744 | 1766 | /* If any of the mandatory well-known attributes are not recognized, |
1767 | then the Error Subcode is set to Unrecognized Well-known | |
1768 | Attribute. The Data field contains the unrecognized attribute | |
1769 | (type, length and value). */ | |
b881c707 | 1770 | if (!CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) |
718e3744 | 1771 | { |
835315bf | 1772 | return bgp_attr_malformed (args, |
b881c707 | 1773 | BGP_NOTIFY_UPDATE_UNREC_ATTR, |
835315bf | 1774 | args->total); |
718e3744 | 1775 | } |
1776 | ||
1777 | /* Unrecognized non-transitive optional attributes must be quietly | |
1778 | ignored and not passed along to other BGP peers. */ | |
1779 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
b881c707 | 1780 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1781 | |
1782 | /* If a path with recognized transitive optional attribute is | |
1783 | accepted and passed along to other BGP peers and the Partial bit | |
1784 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
1785 | is not set back to 0 by the current AS. */ | |
1786 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
1787 | ||
1788 | /* Store transitive attribute to the end of attr->transit. */ | |
fb982c25 | 1789 | if (! ((attre = bgp_attr_extra_get(attr))->transit) ) |
393deb9b | 1790 | attre->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); |
718e3744 | 1791 | |
fb982c25 | 1792 | transit = attre->transit; |
718e3744 | 1793 | |
1794 | if (transit->val) | |
1795 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
1796 | transit->length + total); | |
1797 | else | |
1798 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
1799 | ||
1800 | memcpy (transit->val + transit->length, startp, total); | |
1801 | transit->length += total; | |
1802 | ||
b881c707 | 1803 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1804 | } |
1805 | ||
1806 | /* Read attribute of update packet. This function is called from | |
8b366b9c | 1807 | bgp_update_receive() in bgp_packet.c. */ |
b881c707 | 1808 | bgp_attr_parse_ret_t |
718e3744 | 1809 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, |
1810 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) | |
1811 | { | |
1812 | int ret; | |
b881c707 | 1813 | u_char flag = 0; |
0b2aa3a0 | 1814 | u_char type = 0; |
718e3744 | 1815 | bgp_size_t length; |
1816 | u_char *startp, *endp; | |
1817 | u_char *attr_endp; | |
1818 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
0b2aa3a0 PJ |
1819 | /* we need the as4_path only until we have synthesized the as_path with it */ |
1820 | /* same goes for as4_aggregator */ | |
1821 | struct aspath *as4_path = NULL; | |
1822 | as_t as4_aggregator = 0; | |
1823 | struct in_addr as4_aggregator_addr = { 0 }; | |
718e3744 | 1824 | |
1825 | /* Initialize bitmap. */ | |
1826 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
1827 | ||
1828 | /* End pointer of BGP attribute. */ | |
1829 | endp = BGP_INPUT_PNT (peer) + size; | |
b881c707 | 1830 | |
718e3744 | 1831 | /* Get attributes to the end of attribute length. */ |
1832 | while (BGP_INPUT_PNT (peer) < endp) | |
1833 | { | |
1834 | /* Check remaining length check.*/ | |
1835 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
1836 | { | |
c29fdba7 | 1837 | /* XXX warning: long int format, int arg (arg 5) */ |
16286195 DS |
1838 | zlog_warn ("%s: error BGP attribute length %lu is smaller than min len", |
1839 | peer->host, | |
1840 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
718e3744 | 1841 | |
1842 | bgp_notify_send (peer, | |
1843 | BGP_NOTIFY_UPDATE_ERR, | |
1844 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 1845 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1846 | } |
1847 | ||
1848 | /* Fetch attribute flag and type. */ | |
1849 | startp = BGP_INPUT_PNT (peer); | |
2d42e68a DO |
1850 | /* "The lower-order four bits of the Attribute Flags octet are |
1851 | unused. They MUST be zero when sent and MUST be ignored when | |
1852 | received." */ | |
1853 | flag = 0xF0 & stream_getc (BGP_INPUT (peer)); | |
718e3744 | 1854 | type = stream_getc (BGP_INPUT (peer)); |
1855 | ||
370b64a2 PJ |
1856 | /* Check whether Extended-Length applies and is in bounds */ |
1857 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) | |
1858 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) | |
1859 | { | |
16286195 DS |
1860 | zlog_warn ("%s: Extended length set, but just %lu bytes of attr header", |
1861 | peer->host, | |
1862 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
370b64a2 PJ |
1863 | |
1864 | bgp_notify_send (peer, | |
1865 | BGP_NOTIFY_UPDATE_ERR, | |
1866 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 1867 | return BGP_ATTR_PARSE_ERROR; |
370b64a2 | 1868 | } |
835315bf | 1869 | |
718e3744 | 1870 | /* Check extended attribue length bit. */ |
1871 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
1872 | length = stream_getw (BGP_INPUT (peer)); | |
1873 | else | |
1874 | length = stream_getc (BGP_INPUT (peer)); | |
1875 | ||
1876 | /* If any attribute appears more than once in the UPDATE | |
1877 | message, then the Error Subcode is set to Malformed Attribute | |
1878 | List. */ | |
1879 | ||
1880 | if (CHECK_BITMAP (seen, type)) | |
1881 | { | |
16286195 DS |
1882 | zlog_warn ("%s: error BGP attribute type %d appears twice in a message", |
1883 | peer->host, type); | |
718e3744 | 1884 | |
1885 | bgp_notify_send (peer, | |
1886 | BGP_NOTIFY_UPDATE_ERR, | |
1887 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 | 1888 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1889 | } |
1890 | ||
1891 | /* Set type to bitmap to check duplicate attribute. `type' is | |
1892 | unsigned char so it never overflow bitmap range. */ | |
1893 | ||
1894 | SET_BITMAP (seen, type); | |
1895 | ||
1896 | /* Overflow check. */ | |
1897 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
1898 | ||
1899 | if (attr_endp > endp) | |
1900 | { | |
16286195 | 1901 | zlog_warn ("%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); |
b184ccd8 DS |
1902 | bgp_notify_send_with_data (peer, |
1903 | BGP_NOTIFY_UPDATE_ERR, | |
1904 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1905 | startp, attr_endp - startp); | |
b881c707 | 1906 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1907 | } |
835315bf PJ |
1908 | |
1909 | struct bgp_attr_parser_args attr_args = { | |
1910 | .peer = peer, | |
1911 | .length = length, | |
1912 | .attr = attr, | |
1913 | .type = type, | |
1914 | .flags = flag, | |
1915 | .startp = startp, | |
1916 | .total = attr_endp - startp, | |
1917 | }; | |
1918 | ||
1919 | ||
1920 | /* If any recognized attribute has Attribute Flags that conflict | |
1921 | with the Attribute Type Code, then the Error Subcode is set to | |
1922 | Attribute Flags Error. The Data field contains the erroneous | |
1923 | attribute (type, length and value). */ | |
1924 | if (bgp_attr_flag_invalid (&attr_args)) | |
fa61e16d PJ |
1925 | { |
1926 | bgp_attr_parse_ret_t ret; | |
1927 | ret = bgp_attr_malformed (&attr_args, | |
1928 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1929 | attr_args.total); | |
1930 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
1931 | continue; | |
1932 | return ret; | |
1933 | } | |
718e3744 | 1934 | |
1935 | /* OK check attribute and store it's value. */ | |
1936 | switch (type) | |
1937 | { | |
1938 | case BGP_ATTR_ORIGIN: | |
835315bf | 1939 | ret = bgp_attr_origin (&attr_args); |
718e3744 | 1940 | break; |
1941 | case BGP_ATTR_AS_PATH: | |
835315bf | 1942 | ret = bgp_attr_aspath (&attr_args); |
718e3744 | 1943 | break; |
0b2aa3a0 | 1944 | case BGP_ATTR_AS4_PATH: |
835315bf | 1945 | ret = bgp_attr_as4_path (&attr_args, &as4_path); |
0b2aa3a0 | 1946 | break; |
718e3744 | 1947 | case BGP_ATTR_NEXT_HOP: |
835315bf | 1948 | ret = bgp_attr_nexthop (&attr_args); |
718e3744 | 1949 | break; |
1950 | case BGP_ATTR_MULTI_EXIT_DISC: | |
835315bf | 1951 | ret = bgp_attr_med (&attr_args); |
718e3744 | 1952 | break; |
1953 | case BGP_ATTR_LOCAL_PREF: | |
835315bf | 1954 | ret = bgp_attr_local_pref (&attr_args); |
718e3744 | 1955 | break; |
1956 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
835315bf | 1957 | ret = bgp_attr_atomic (&attr_args); |
718e3744 | 1958 | break; |
1959 | case BGP_ATTR_AGGREGATOR: | |
835315bf | 1960 | ret = bgp_attr_aggregator (&attr_args); |
718e3744 | 1961 | break; |
0b2aa3a0 | 1962 | case BGP_ATTR_AS4_AGGREGATOR: |
835315bf PJ |
1963 | ret = bgp_attr_as4_aggregator (&attr_args, |
1964 | &as4_aggregator, | |
1965 | &as4_aggregator_addr); | |
0b2aa3a0 | 1966 | break; |
718e3744 | 1967 | case BGP_ATTR_COMMUNITIES: |
835315bf | 1968 | ret = bgp_attr_community (&attr_args); |
718e3744 | 1969 | break; |
1970 | case BGP_ATTR_ORIGINATOR_ID: | |
835315bf | 1971 | ret = bgp_attr_originator_id (&attr_args); |
718e3744 | 1972 | break; |
1973 | case BGP_ATTR_CLUSTER_LIST: | |
835315bf | 1974 | ret = bgp_attr_cluster_list (&attr_args); |
718e3744 | 1975 | break; |
1976 | case BGP_ATTR_MP_REACH_NLRI: | |
835315bf | 1977 | ret = bgp_mp_reach_parse (&attr_args, mp_update); |
718e3744 | 1978 | break; |
1979 | case BGP_ATTR_MP_UNREACH_NLRI: | |
835315bf | 1980 | ret = bgp_mp_unreach_parse (&attr_args, mp_withdraw); |
718e3744 | 1981 | break; |
1982 | case BGP_ATTR_EXT_COMMUNITIES: | |
835315bf | 1983 | ret = bgp_attr_ext_communities (&attr_args); |
718e3744 | 1984 | break; |
1985 | default: | |
835315bf | 1986 | ret = bgp_attr_unknown (&attr_args); |
718e3744 | 1987 | break; |
1988 | } | |
b881c707 | 1989 | |
f57000c0 DL |
1990 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) |
1991 | { | |
1992 | bgp_notify_send (peer, | |
1993 | BGP_NOTIFY_UPDATE_ERR, | |
1994 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1995 | ret = BGP_ATTR_PARSE_ERROR; | |
1996 | } | |
1997 | ||
b881c707 PJ |
1998 | /* If hard error occured immediately return to the caller. */ |
1999 | if (ret == BGP_ATTR_PARSE_ERROR) | |
6e4ab12f | 2000 | { |
16286195 DS |
2001 | zlog_warn ("%s: Attribute %s, parse error", |
2002 | peer->host, | |
2003 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
2004 | if (as4_path) |
2005 | aspath_unintern (&as4_path); | |
2006 | return ret; | |
6e4ab12f | 2007 | } |
b881c707 PJ |
2008 | if (ret == BGP_ATTR_PARSE_WITHDRAW) |
2009 | { | |
2010 | ||
16286195 DS |
2011 | zlog_warn ("%s: Attribute %s, parse error - treating as withdrawal", |
2012 | peer->host, | |
2013 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
2014 | if (as4_path) |
2015 | aspath_unintern (&as4_path); | |
2016 | return ret; | |
2017 | } | |
2018 | ||
718e3744 | 2019 | /* Check the fetched length. */ |
2020 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
2021 | { | |
16286195 DS |
2022 | zlog_warn ("%s: BGP attribute %s, fetch error", |
2023 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 2024 | bgp_notify_send (peer, |
2025 | BGP_NOTIFY_UPDATE_ERR, | |
2026 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2027 | if (as4_path) |
2028 | aspath_unintern (&as4_path); | |
2029 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2030 | } |
2031 | } | |
2032 | ||
2033 | /* Check final read pointer is same as end pointer. */ | |
2034 | if (BGP_INPUT_PNT (peer) != endp) | |
2035 | { | |
16286195 DS |
2036 | zlog_warn ("%s: BGP attribute %s, length mismatch", |
2037 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 2038 | bgp_notify_send (peer, |
2039 | BGP_NOTIFY_UPDATE_ERR, | |
2040 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2041 | if (as4_path) |
2042 | aspath_unintern (&as4_path); | |
2043 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2044 | } |
2045 | ||
0b2aa3a0 PJ |
2046 | /* |
2047 | * At this place we can see whether we got AS4_PATH and/or | |
2048 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2049 | * We can not do this before we've read all attributes because | |
2050 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2051 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2052 | * in relationship to AGGREGATOR. | |
2053 | * So, to be defensive, we are not relying on any order and read | |
2054 | * all attributes first, including these 32bit ones, and now, | |
2055 | * afterwards, we look what and if something is to be done for as4. | |
2056 | */ | |
f57000c0 DL |
2057 | /* actually... this doesn't ever return failure currently, but |
2058 | * better safe than sorry */ | |
835315bf | 2059 | if (bgp_attr_munge_as4_attrs (peer, attr, as4_path, |
0b2aa3a0 | 2060 | as4_aggregator, &as4_aggregator_addr)) |
b881c707 | 2061 | { |
f57000c0 DL |
2062 | bgp_notify_send (peer, |
2063 | BGP_NOTIFY_UPDATE_ERR, | |
2064 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 PJ |
2065 | if (as4_path) |
2066 | aspath_unintern (&as4_path); | |
2067 | return BGP_ATTR_PARSE_ERROR; | |
2068 | } | |
0b2aa3a0 PJ |
2069 | |
2070 | /* At this stage, we have done all fiddling with as4, and the | |
2071 | * resulting info is in attr->aggregator resp. attr->aspath | |
2072 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2073 | * order to save memory | |
2074 | */ | |
b881c707 | 2075 | if (as4_path) |
0b2aa3a0 | 2076 | { |
f6f434b2 | 2077 | aspath_unintern (&as4_path); /* unintern - it is in the hash */ |
0b2aa3a0 PJ |
2078 | /* The flag that we got this is still there, but that does not |
2079 | * do any trouble | |
2080 | */ | |
2081 | } | |
2082 | /* | |
2083 | * The "rest" of the code does nothing with as4_aggregator. | |
2084 | * there is no memory attached specifically which is not part | |
2085 | * of the attr. | |
2086 | * so ignoring just means do nothing. | |
2087 | */ | |
2088 | /* | |
2089 | * Finally do the checks on the aspath we did not do yet | |
2090 | * because we waited for a potentially synthesized aspath. | |
2091 | */ | |
b881c707 | 2092 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) |
0b2aa3a0 | 2093 | { |
835315bf | 2094 | ret = bgp_attr_aspath_check (peer, attr); |
b881c707 | 2095 | if (ret != BGP_ATTR_PARSE_PROCEED) |
0b2aa3a0 PJ |
2096 | return ret; |
2097 | } | |
2098 | ||
718e3744 | 2099 | /* Finally intern unknown attribute. */ |
fb982c25 PJ |
2100 | if (attr->extra && attr->extra->transit) |
2101 | attr->extra->transit = transit_intern (attr->extra->transit); | |
718e3744 | 2102 | |
b881c707 | 2103 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2104 | } |
2105 | ||
2106 | /* Well-known attribute check. */ | |
2107 | int | |
43ccf9f4 | 2108 | bgp_attr_check (struct peer *peer, struct attr *attr, bgp_size_t nlri_len) |
718e3744 | 2109 | { |
2110 | u_char type = 0; | |
2111 | ||
2112 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) | |
2113 | type = BGP_ATTR_ORIGIN; | |
2114 | ||
2115 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
2116 | type = BGP_ATTR_AS_PATH; | |
2117 | ||
43ccf9f4 DS |
2118 | /* As per RFC 2858, NEXT_HOP is needed only if the update contains NLRI |
2119 | * other than in MP_REACH. In fact, if only MP_REACH_NLRI is present, the | |
2120 | * update should not contain NEXT_HOP but it should be ignored, if recvd. | |
2121 | */ | |
2122 | if (nlri_len) | |
2123 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP))) | |
2124 | type = BGP_ATTR_NEXT_HOP; | |
718e3744 | 2125 | |
6d85b15b | 2126 | if (peer->sort == BGP_PEER_IBGP |
718e3744 | 2127 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) |
2128 | type = BGP_ATTR_LOCAL_PREF; | |
2129 | ||
2130 | if (type) | |
2131 | { | |
16286195 | 2132 | zlog_warn ("%s Missing well-known attribute %d.", peer->host, type); |
718e3744 | 2133 | bgp_notify_send_with_data (peer, |
2134 | BGP_NOTIFY_UPDATE_ERR, | |
2135 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
2136 | &type, 1); | |
b881c707 | 2137 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2138 | } |
b881c707 | 2139 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2140 | } |
6b0655a2 | 2141 | |
8c71e481 | 2142 | size_t |
8a92a8a0 | 2143 | bgp_packet_mpattr_start (struct stream *s, afi_t afi, safi_t safi, afi_t nh_afi, |
3f9c7369 | 2144 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 PM |
2145 | struct attr *attr) |
2146 | { | |
2147 | size_t sizep; | |
2148 | ||
2149 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2150 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2151 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
2152 | sizep = stream_get_endp (s); | |
2153 | stream_putw (s, 0); /* Marker: Attribute length. */ | |
2154 | stream_putw (s, afi); /* AFI */ | |
2155 | stream_putc (s, safi); /* SAFI */ | |
2156 | ||
2157 | /* Nexthop */ | |
8a92a8a0 | 2158 | switch (nh_afi) |
8c71e481 PM |
2159 | { |
2160 | case AFI_IP: | |
2161 | switch (safi) | |
2162 | { | |
2163 | case SAFI_UNICAST: | |
2164 | case SAFI_MULTICAST: | |
3f9c7369 | 2165 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 PM |
2166 | stream_putc (s, 4); |
2167 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2168 | break; | |
2169 | case SAFI_MPLS_VPN: | |
3f9c7369 | 2170 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 PM |
2171 | stream_putc (s, 12); |
2172 | stream_putl (s, 0); | |
2173 | stream_putl (s, 0); | |
2174 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); | |
2175 | break; | |
2176 | default: | |
2177 | break; | |
2178 | } | |
2179 | break; | |
2180 | #ifdef HAVE_IPV6 | |
2181 | case AFI_IP6: | |
2182 | switch (safi) | |
2183 | { | |
2184 | case SAFI_UNICAST: | |
2185 | case SAFI_MULTICAST: | |
2186 | { | |
8c71e481 PM |
2187 | struct attr_extra *attre = attr->extra; |
2188 | ||
2189 | assert (attr->extra); | |
3f9c7369 | 2190 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 | 2191 | stream_putc (s, attre->mp_nexthop_len); |
801a9bcc DS |
2192 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2193 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
2194 | stream_put (s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
8c71e481 PM |
2195 | } |
2196 | default: | |
2197 | break; | |
2198 | } | |
2199 | break; | |
2200 | #endif /*HAVE_IPV6*/ | |
2201 | default: | |
2202 | break; | |
2203 | } | |
2204 | ||
2205 | /* SNPA */ | |
2206 | stream_putc (s, 0); | |
2207 | return sizep; | |
2208 | } | |
2209 | ||
2210 | void | |
2211 | bgp_packet_mpattr_prefix (struct stream *s, afi_t afi, safi_t safi, | |
2212 | struct prefix *p, struct prefix_rd *prd, | |
adbac85e DW |
2213 | u_char *tag, int addpath_encode, |
2214 | u_int32_t addpath_tx_id) | |
8c71e481 PM |
2215 | { |
2216 | switch (safi) | |
2217 | { | |
2218 | case SAFI_MPLS_VPN: | |
adbac85e DW |
2219 | /* addpath TX ID */ |
2220 | if (addpath_encode) | |
2221 | stream_putl(s, addpath_tx_id); | |
2222 | ||
8c71e481 PM |
2223 | /* Tag, RD, Prefix write. */ |
2224 | stream_putc (s, p->prefixlen + 88); | |
2225 | stream_put (s, tag, 3); | |
2226 | stream_put (s, prd->val, 8); | |
2227 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2228 | break; | |
2229 | default: | |
2230 | /* Prefix write. */ | |
adbac85e | 2231 | stream_put_prefix_addpath (s, p, addpath_encode, addpath_tx_id); |
8c71e481 PM |
2232 | break; |
2233 | } | |
2234 | } | |
2235 | ||
2236 | void | |
2237 | bgp_packet_mpattr_end (struct stream *s, size_t sizep) | |
2238 | { | |
2239 | /* Set MP attribute length. Don't count the (2) bytes used to encode | |
2240 | the attr length */ | |
2241 | stream_putw_at (s, sizep, (stream_get_endp (s) - sizep) - 2); | |
2242 | } | |
2243 | ||
718e3744 | 2244 | /* Make attribute packet. */ |
2245 | bgp_size_t | |
2246 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
8c71e481 | 2247 | struct stream *s, struct attr *attr, |
3f9c7369 | 2248 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 | 2249 | struct prefix *p, afi_t afi, safi_t safi, |
adbac85e DW |
2250 | struct peer *from, struct prefix_rd *prd, u_char *tag, |
2251 | int addpath_encode, | |
2252 | u_int32_t addpath_tx_id) | |
718e3744 | 2253 | { |
fe69a505 | 2254 | size_t cp; |
0b2aa3a0 | 2255 | size_t aspath_sizep; |
718e3744 | 2256 | struct aspath *aspath; |
0b2aa3a0 PJ |
2257 | int send_as4_path = 0; |
2258 | int send_as4_aggregator = 0; | |
2259 | int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
8c71e481 | 2260 | size_t mpattrlen_pos = 0; |
718e3744 | 2261 | |
2262 | if (! bgp) | |
75aead62 | 2263 | bgp = peer->bgp; |
718e3744 | 2264 | |
2265 | /* Remember current pointer. */ | |
9985f83c | 2266 | cp = stream_get_endp (s); |
718e3744 | 2267 | |
8a92a8a0 DS |
2268 | if (p && !((afi == AFI_IP && safi == SAFI_UNICAST) && |
2269 | !peer_cap_enhe(peer))) | |
8c71e481 | 2270 | { |
8a92a8a0 DS |
2271 | mpattrlen_pos = bgp_packet_mpattr_start(s, afi, safi, |
2272 | (peer_cap_enhe(peer) ? AFI_IP6 : afi), | |
2273 | vecarr, attr); | |
adbac85e DW |
2274 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, tag, |
2275 | addpath_encode, addpath_tx_id); | |
8c71e481 PM |
2276 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
2277 | } | |
2278 | ||
718e3744 | 2279 | /* Origin attribute. */ |
2280 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2281 | stream_putc (s, BGP_ATTR_ORIGIN); | |
2282 | stream_putc (s, 1); | |
2283 | stream_putc (s, attr->origin); | |
2284 | ||
2285 | /* AS path attribute. */ | |
2286 | ||
2287 | /* If remote-peer is EBGP */ | |
6d85b15b | 2288 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 2289 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) |
fe69a505 | 2290 | || attr->aspath->segments == NULL) |
fee0f4c6 | 2291 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 2292 | { |
2293 | aspath = aspath_dup (attr->aspath); | |
2294 | ||
66b199b2 DS |
2295 | /* Even though we may not be configured for confederations we may have |
2296 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
2297 | aspath = aspath_delete_confed_seq (aspath); | |
2298 | ||
718e3744 | 2299 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) |
2300 | { | |
66b199b2 | 2301 | /* Stuff our path CONFED_ID on the front */ |
718e3744 | 2302 | aspath = aspath_add_seq (aspath, bgp->confed_id); |
2303 | } | |
2304 | else | |
2305 | { | |
9d3f9705 AC |
2306 | if (peer->change_local_as) { |
2307 | /* If replace-as is specified, we only use the change_local_as when | |
2308 | advertising routes. */ | |
2309 | if( ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) { | |
2310 | aspath = aspath_add_seq (aspath, peer->local_as); | |
2311 | } | |
718e3744 | 2312 | aspath = aspath_add_seq (aspath, peer->change_local_as); |
9d3f9705 AC |
2313 | } else { |
2314 | aspath = aspath_add_seq (aspath, peer->local_as); | |
2315 | } | |
718e3744 | 2316 | } |
2317 | } | |
6d85b15b | 2318 | else if (peer->sort == BGP_PEER_CONFED) |
718e3744 | 2319 | { |
2320 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
2321 | aspath = aspath_dup (attr->aspath); | |
2322 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
2323 | } | |
2324 | else | |
2325 | aspath = attr->aspath; | |
2326 | ||
0b2aa3a0 PJ |
2327 | /* If peer is not AS4 capable, then: |
2328 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
2329 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment | |
2330 | * types are in it (i.e. exclude them if they are there) | |
2331 | * AND do this only if there is at least one asnum > 65535 in the path! | |
2332 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change | |
2333 | * all ASnums > 65535 to BGP_AS_TRANS | |
2334 | */ | |
2335 | ||
2336 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2337 | stream_putc (s, BGP_ATTR_AS_PATH); | |
2338 | aspath_sizep = stream_get_endp (s); | |
2339 | stream_putw (s, 0); | |
2340 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit)); | |
2341 | ||
2342 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
2343 | * in the path | |
2344 | */ | |
2345 | if (!use32bit && aspath_has_as4 (aspath)) | |
2346 | send_as4_path = 1; /* we'll do this later, at the correct place */ | |
2347 | ||
718e3744 | 2348 | /* Nexthop attribute. */ |
8a92a8a0 | 2349 | if (afi == AFI_IP && !peer_cap_enhe(peer)) |
718e3744 | 2350 | { |
8a92a8a0 DS |
2351 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
2352 | { | |
2353 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2354 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2355 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2356 | stream_putc (s, 4); | |
2357 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2358 | } | |
2359 | else if (safi == SAFI_UNICAST && peer_cap_enhe(from)) | |
2360 | { | |
2361 | /* | |
2362 | * Likely this is the case when an IPv4 prefix was received with | |
2363 | * Extended Next-hop capability and now being advertised to | |
2364 | * non-ENHE peers. | |
2365 | * Setting the mandatory (ipv4) next-hop attribute here to enable | |
2366 | * implicit next-hop self with correct (ipv4 address family). | |
2367 | */ | |
2368 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2369 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2370 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, NULL); | |
2371 | stream_putc (s, 4); | |
2372 | stream_put_ipv4 (s, 0); | |
2373 | } | |
718e3744 | 2374 | } |
2375 | ||
2376 | /* MED attribute. */ | |
abc920f8 DS |
2377 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC) || |
2378 | bgp->maxmed_active) | |
718e3744 | 2379 | { |
2380 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2381 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
2382 | stream_putc (s, 4); | |
abc920f8 | 2383 | stream_putl (s, (bgp->maxmed_active ? bgp->maxmed_value : attr->med)); |
718e3744 | 2384 | } |
2385 | ||
2386 | /* Local preference. */ | |
6d85b15b JBD |
2387 | if (peer->sort == BGP_PEER_IBGP || |
2388 | peer->sort == BGP_PEER_CONFED) | |
718e3744 | 2389 | { |
2390 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2391 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
2392 | stream_putc (s, 4); | |
2393 | stream_putl (s, attr->local_pref); | |
2394 | } | |
2395 | ||
2396 | /* Atomic aggregate. */ | |
2397 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
2398 | { | |
2399 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2400 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
2401 | stream_putc (s, 0); | |
2402 | } | |
2403 | ||
2404 | /* Aggregator. */ | |
2405 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
2406 | { | |
fb982c25 | 2407 | assert (attr->extra); |
0b2aa3a0 PJ |
2408 | |
2409 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
718e3744 | 2410 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
2411 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
2412 | |
2413 | if (use32bit) | |
2414 | { | |
2415 | /* AS4 capable peer */ | |
2416 | stream_putc (s, 8); | |
2417 | stream_putl (s, attr->extra->aggregator_as); | |
2418 | } | |
2419 | else | |
2420 | { | |
2421 | /* 2-byte AS peer */ | |
2422 | stream_putc (s, 6); | |
2423 | ||
2424 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */ | |
2425 | if ( attr->extra->aggregator_as > 65535 ) | |
2426 | { | |
2427 | stream_putw (s, BGP_AS_TRANS); | |
2428 | ||
2429 | /* we have to send AS4_AGGREGATOR, too. | |
2430 | * we'll do that later in order to send attributes in ascending | |
2431 | * order. | |
2432 | */ | |
2433 | send_as4_aggregator = 1; | |
2434 | } | |
2435 | else | |
2436 | stream_putw (s, (u_int16_t) attr->extra->aggregator_as); | |
2437 | } | |
fb982c25 | 2438 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 2439 | } |
2440 | ||
2441 | /* Community attribute. */ | |
2442 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
2443 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
2444 | { | |
2445 | if (attr->community->size * 4 > 255) | |
2446 | { | |
2447 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2448 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2449 | stream_putw (s, attr->community->size * 4); | |
2450 | } | |
2451 | else | |
2452 | { | |
2453 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2454 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2455 | stream_putc (s, attr->community->size * 4); | |
2456 | } | |
2457 | stream_put (s, attr->community->val, attr->community->size * 4); | |
2458 | } | |
2459 | ||
2460 | /* Route Reflector. */ | |
6d85b15b | 2461 | if (peer->sort == BGP_PEER_IBGP |
718e3744 | 2462 | && from |
6d85b15b | 2463 | && from->sort == BGP_PEER_IBGP) |
718e3744 | 2464 | { |
2465 | /* Originator ID. */ | |
2466 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2467 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
2468 | stream_putc (s, 4); | |
2469 | ||
2470 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
fb982c25 | 2471 | stream_put_in_addr (s, &attr->extra->originator_id); |
34c3f81b PJ |
2472 | else |
2473 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 2474 | |
2475 | /* Cluster list. */ | |
2476 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2477 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
2478 | ||
9eda90ce | 2479 | if (attr->extra && attr->extra->cluster) |
718e3744 | 2480 | { |
fb982c25 | 2481 | stream_putc (s, attr->extra->cluster->length + 4); |
718e3744 | 2482 | /* If this peer configuration's parent BGP has cluster_id. */ |
2483 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
2484 | stream_put_in_addr (s, &bgp->cluster_id); | |
2485 | else | |
2486 | stream_put_in_addr (s, &bgp->router_id); | |
fb982c25 PJ |
2487 | stream_put (s, attr->extra->cluster->list, |
2488 | attr->extra->cluster->length); | |
718e3744 | 2489 | } |
2490 | else | |
2491 | { | |
2492 | stream_putc (s, 4); | |
2493 | /* If this peer configuration's parent BGP has cluster_id. */ | |
2494 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
2495 | stream_put_in_addr (s, &bgp->cluster_id); | |
2496 | else | |
2497 | stream_put_in_addr (s, &bgp->router_id); | |
2498 | } | |
2499 | } | |
2500 | ||
718e3744 | 2501 | /* Extended Communities attribute. */ |
2502 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
2503 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
2504 | { | |
fb982c25 PJ |
2505 | struct attr_extra *attre = attr->extra; |
2506 | ||
2507 | assert (attre); | |
2508 | ||
6d85b15b JBD |
2509 | if (peer->sort == BGP_PEER_IBGP |
2510 | || peer->sort == BGP_PEER_CONFED) | |
718e3744 | 2511 | { |
fb982c25 | 2512 | if (attre->ecommunity->size * 8 > 255) |
4372df71 | 2513 | { |
2514 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2515 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 2516 | stream_putw (s, attre->ecommunity->size * 8); |
4372df71 | 2517 | } |
2518 | else | |
2519 | { | |
2520 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2521 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 2522 | stream_putc (s, attre->ecommunity->size * 8); |
4372df71 | 2523 | } |
fb982c25 | 2524 | stream_put (s, attre->ecommunity->val, attre->ecommunity->size * 8); |
718e3744 | 2525 | } |
2526 | else | |
2527 | { | |
5228ad27 | 2528 | u_int8_t *pnt; |
4372df71 | 2529 | int tbit; |
2530 | int ecom_tr_size = 0; | |
2531 | int i; | |
2532 | ||
fb982c25 | 2533 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 2534 | { |
fb982c25 | 2535 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 2536 | tbit = *pnt; |
2537 | ||
2538 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
2539 | continue; | |
2540 | ||
2541 | ecom_tr_size++; | |
2542 | } | |
2543 | ||
2544 | if (ecom_tr_size) | |
2545 | { | |
2546 | if (ecom_tr_size * 8 > 255) | |
2547 | { | |
2548 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2549 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
2550 | stream_putw (s, ecom_tr_size * 8); | |
2551 | } | |
2552 | else | |
2553 | { | |
2554 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2555 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
2556 | stream_putc (s, ecom_tr_size * 8); | |
2557 | } | |
2558 | ||
fb982c25 | 2559 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 2560 | { |
fb982c25 | 2561 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 2562 | tbit = *pnt; |
2563 | ||
2564 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
2565 | continue; | |
2566 | ||
2567 | stream_put (s, pnt, 8); | |
2568 | } | |
2569 | } | |
718e3744 | 2570 | } |
718e3744 | 2571 | } |
0b2aa3a0 PJ |
2572 | |
2573 | if ( send_as4_path ) | |
2574 | { | |
2575 | /* If the peer is NOT As4 capable, AND */ | |
2576 | /* there are ASnums > 65535 in path THEN | |
2577 | * give out AS4_PATH */ | |
2578 | ||
2579 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
2580 | * path segments! | |
2581 | * Hm, I wonder... confederation things *should* only be at | |
2582 | * the beginning of an aspath, right? Then we should use | |
2583 | * aspath_delete_confed_seq for this, because it is already | |
2584 | * there! (JK) | |
2585 | * Folks, talk to me: what is reasonable here!? | |
2586 | */ | |
2587 | aspath = aspath_delete_confed_seq (aspath); | |
2588 | ||
2589 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2590 | stream_putc (s, BGP_ATTR_AS4_PATH); | |
2591 | aspath_sizep = stream_get_endp (s); | |
2592 | stream_putw (s, 0); | |
2593 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1)); | |
2594 | } | |
2595 | ||
2596 | if (aspath != attr->aspath) | |
2597 | aspath_free (aspath); | |
2598 | ||
2599 | if ( send_as4_aggregator ) | |
2600 | { | |
2601 | assert (attr->extra); | |
2602 | ||
2603 | /* send AS4_AGGREGATOR, at this place */ | |
2604 | /* this section of code moved here in order to ensure the correct | |
2605 | * *ascending* order of attributes | |
2606 | */ | |
2607 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2608 | stream_putc (s, BGP_ATTR_AS4_AGGREGATOR); | |
2609 | stream_putc (s, 8); | |
2610 | stream_putl (s, attr->extra->aggregator_as); | |
2611 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); | |
2612 | } | |
41367172 | 2613 | |
718e3744 | 2614 | /* Unknown transit attribute. */ |
fb982c25 PJ |
2615 | if (attr->extra && attr->extra->transit) |
2616 | stream_put (s, attr->extra->transit->val, attr->extra->transit->length); | |
718e3744 | 2617 | |
2618 | /* Return total size of attribute. */ | |
9985f83c | 2619 | return stream_get_endp (s) - cp; |
718e3744 | 2620 | } |
2621 | ||
8c71e481 PM |
2622 | size_t |
2623 | bgp_packet_mpunreach_start (struct stream *s, afi_t afi, safi_t safi) | |
718e3744 | 2624 | { |
718e3744 | 2625 | unsigned long attrlen_pnt; |
718e3744 | 2626 | |
8c71e481 PM |
2627 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
2628 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
718e3744 | 2629 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); |
2630 | ||
9985f83c | 2631 | attrlen_pnt = stream_get_endp (s); |
8c71e481 | 2632 | stream_putw (s, 0); /* Length of this attribute. */ |
718e3744 | 2633 | |
8c71e481 PM |
2634 | stream_putw (s, afi); |
2635 | safi = (safi == SAFI_MPLS_VPN) ? SAFI_MPLS_LABELED_VPN : safi; | |
2636 | stream_putc (s, safi); | |
2637 | return attrlen_pnt; | |
2638 | } | |
718e3744 | 2639 | |
8c71e481 PM |
2640 | void |
2641 | bgp_packet_mpunreach_prefix (struct stream *s, struct prefix *p, | |
2642 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
adbac85e DW |
2643 | u_char *tag, int addpath_encode, |
2644 | u_int32_t addpath_tx_id) | |
8c71e481 | 2645 | { |
718e3744 | 2646 | if (safi == SAFI_MPLS_VPN) |
2647 | { | |
adbac85e DW |
2648 | /* addpath TX ID */ |
2649 | if (addpath_encode) | |
2650 | stream_putl(s, addpath_tx_id); | |
2651 | ||
718e3744 | 2652 | stream_putc (s, p->prefixlen + 88); |
2653 | stream_put (s, tag, 3); | |
2654 | stream_put (s, prd->val, 8); | |
2655 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2656 | } | |
2657 | else | |
adbac85e | 2658 | stream_put_prefix_addpath (s, p, addpath_encode, addpath_tx_id); |
8c71e481 | 2659 | } |
718e3744 | 2660 | |
8c71e481 PM |
2661 | void |
2662 | bgp_packet_mpunreach_end (struct stream *s, size_t attrlen_pnt) | |
2663 | { | |
2664 | bgp_size_t size; | |
718e3744 | 2665 | |
8c71e481 PM |
2666 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
2667 | the attr length */ | |
2668 | size = stream_get_endp (s) - attrlen_pnt - 2; | |
2669 | stream_putw_at (s, attrlen_pnt, size); | |
718e3744 | 2670 | } |
2671 | ||
2672 | /* Initialization of attribute. */ | |
2673 | void | |
fe69a505 | 2674 | bgp_attr_init (void) |
718e3744 | 2675 | { |
718e3744 | 2676 | aspath_init (); |
2677 | attrhash_init (); | |
2678 | community_init (); | |
2679 | ecommunity_init (); | |
2680 | cluster_init (); | |
2681 | transit_init (); | |
2682 | } | |
2683 | ||
228da428 CC |
2684 | void |
2685 | bgp_attr_finish (void) | |
2686 | { | |
2687 | aspath_finish (); | |
2688 | attrhash_finish (); | |
2689 | community_finish (); | |
2690 | ecommunity_finish (); | |
2691 | cluster_finish (); | |
2692 | transit_finish (); | |
2693 | } | |
2694 | ||
718e3744 | 2695 | /* Make attribute packet. */ |
2696 | void | |
a384592f | 2697 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
2698 | struct prefix *prefix) | |
718e3744 | 2699 | { |
2700 | unsigned long cp; | |
2701 | unsigned long len; | |
0b2aa3a0 | 2702 | size_t aspath_lenp; |
718e3744 | 2703 | struct aspath *aspath; |
adbac85e DW |
2704 | int addpath_encode = 0; |
2705 | u_int32_t addpath_tx_id = 0; | |
718e3744 | 2706 | |
2707 | /* Remember current pointer. */ | |
9985f83c | 2708 | cp = stream_get_endp (s); |
718e3744 | 2709 | |
2710 | /* Place holder of length. */ | |
2711 | stream_putw (s, 0); | |
2712 | ||
2713 | /* Origin attribute. */ | |
2714 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2715 | stream_putc (s, BGP_ATTR_ORIGIN); | |
2716 | stream_putc (s, 1); | |
2717 | stream_putc (s, attr->origin); | |
2718 | ||
2719 | aspath = attr->aspath; | |
0b2aa3a0 PJ |
2720 | |
2721 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2722 | stream_putc (s, BGP_ATTR_AS_PATH); | |
2723 | aspath_lenp = stream_get_endp (s); | |
2724 | stream_putw (s, 0); | |
2725 | ||
2726 | stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1)); | |
718e3744 | 2727 | |
2728 | /* Nexthop attribute. */ | |
a384592f | 2729 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
2730 | if(prefix != NULL | |
2731 | #ifdef HAVE_IPV6 | |
2732 | && prefix->family != AF_INET6 | |
2733 | #endif /* HAVE_IPV6 */ | |
2734 | ) | |
2735 | { | |
2736 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2737 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2738 | stream_putc (s, 4); | |
2739 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2740 | } | |
718e3744 | 2741 | |
2742 | /* MED attribute. */ | |
2743 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
2744 | { | |
2745 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2746 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
2747 | stream_putc (s, 4); | |
2748 | stream_putl (s, attr->med); | |
2749 | } | |
2750 | ||
2751 | /* Local preference. */ | |
2752 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
2753 | { | |
2754 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2755 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
2756 | stream_putc (s, 4); | |
2757 | stream_putl (s, attr->local_pref); | |
2758 | } | |
2759 | ||
2760 | /* Atomic aggregate. */ | |
2761 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
2762 | { | |
2763 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2764 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
2765 | stream_putc (s, 0); | |
2766 | } | |
2767 | ||
2768 | /* Aggregator. */ | |
2769 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
2770 | { | |
fb982c25 | 2771 | assert (attr->extra); |
718e3744 | 2772 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
2773 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
2774 | stream_putc (s, 8); |
2775 | stream_putl (s, attr->extra->aggregator_as); | |
fb982c25 | 2776 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 2777 | } |
2778 | ||
2779 | /* Community attribute. */ | |
2780 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
2781 | { | |
2782 | if (attr->community->size * 4 > 255) | |
2783 | { | |
2784 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2785 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2786 | stream_putw (s, attr->community->size * 4); | |
2787 | } | |
2788 | else | |
2789 | { | |
2790 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2791 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2792 | stream_putc (s, attr->community->size * 4); | |
2793 | } | |
2794 | stream_put (s, attr->community->val, attr->community->size * 4); | |
2795 | } | |
2796 | ||
a384592f | 2797 | #ifdef HAVE_IPV6 |
2798 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
fb982c25 | 2799 | if (prefix != NULL && prefix->family == AF_INET6 && attr->extra && |
801a9bcc DS |
2800 | (attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL || |
2801 | attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) ) | |
a384592f | 2802 | { |
2803 | int sizep; | |
fb982c25 PJ |
2804 | struct attr_extra *attre = attr->extra; |
2805 | ||
a384592f | 2806 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); |
2807 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2808 | sizep = stream_get_endp (s); |
a384592f | 2809 | |
2810 | /* MP header */ | |
fb982c25 | 2811 | stream_putc (s, 0); /* Marker: Attribute length. */ |
a384592f | 2812 | stream_putw(s, AFI_IP6); /* AFI */ |
2813 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
2814 | ||
2815 | /* Next hop */ | |
fb982c25 | 2816 | stream_putc(s, attre->mp_nexthop_len); |
801a9bcc DS |
2817 | stream_put(s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2818 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
2819 | stream_put(s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
a384592f | 2820 | |
2821 | /* SNPA */ | |
2822 | stream_putc(s, 0); | |
2823 | ||
2824 | /* Prefix */ | |
adbac85e | 2825 | stream_put_prefix_addpath (s, prefix, addpath_encode, addpath_tx_id); |
a384592f | 2826 | |
2827 | /* Set MP attribute length. */ | |
9985f83c | 2828 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 2829 | } |
2830 | #endif /* HAVE_IPV6 */ | |
2831 | ||
718e3744 | 2832 | /* Return total size of attribute. */ |
9985f83c | 2833 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 2834 | stream_putw_at (s, cp, len); |
2835 | } |