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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" |
718e3744 | 32 | |
33 | #include "bgpd/bgpd.h" | |
34 | #include "bgpd/bgp_attr.h" | |
35 | #include "bgpd/bgp_route.h" | |
36 | #include "bgpd/bgp_aspath.h" | |
37 | #include "bgpd/bgp_community.h" | |
38 | #include "bgpd/bgp_debug.h" | |
39 | #include "bgpd/bgp_packet.h" | |
40 | #include "bgpd/bgp_ecommunity.h" | |
41 | \f | |
42 | /* Attribute strings for logging. */ | |
9bddac4b | 43 | static const struct message attr_str [] = |
718e3744 | 44 | { |
45 | { BGP_ATTR_ORIGIN, "ORIGIN" }, | |
46 | { BGP_ATTR_AS_PATH, "AS_PATH" }, | |
47 | { BGP_ATTR_NEXT_HOP, "NEXT_HOP" }, | |
48 | { BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" }, | |
49 | { BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" }, | |
50 | { BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" }, | |
51 | { BGP_ATTR_AGGREGATOR, "AGGREGATOR" }, | |
52 | { BGP_ATTR_COMMUNITIES, "COMMUNITY" }, | |
53 | { BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" }, | |
54 | { BGP_ATTR_CLUSTER_LIST, "CLUSTERLIST" }, | |
55 | { BGP_ATTR_DPA, "DPA" }, | |
56 | { BGP_ATTR_ADVERTISER, "ADVERTISER"} , | |
57 | { BGP_ATTR_RCID_PATH, "RCID_PATH" }, | |
58 | { BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" }, | |
59 | { BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" }, | |
0b2aa3a0 PJ |
60 | { BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" }, |
61 | { BGP_ATTR_AS4_PATH, "AS4_PATH" }, | |
62 | { BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" }, | |
63 | { BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" }, | |
718e3744 | 64 | }; |
9bddac4b | 65 | static const int attr_str_max = sizeof(attr_str)/sizeof(attr_str[0]); |
718e3744 | 66 | \f |
9bddac4b | 67 | static struct hash *cluster_hash; |
718e3744 | 68 | |
94f2b392 | 69 | static void * |
923de654 | 70 | cluster_hash_alloc (void *p) |
718e3744 | 71 | { |
923de654 | 72 | struct cluster_list * val = (struct cluster_list *) p; |
718e3744 | 73 | struct cluster_list *cluster; |
74 | ||
75 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
76 | cluster->length = val->length; | |
77 | ||
78 | if (cluster->length) | |
79 | { | |
80 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
81 | memcpy (cluster->list, val->list, val->length); | |
82 | } | |
83 | else | |
84 | cluster->list = NULL; | |
85 | ||
86 | cluster->refcnt = 0; | |
87 | ||
88 | return cluster; | |
89 | } | |
90 | ||
91 | /* Cluster list related functions. */ | |
94f2b392 | 92 | static struct cluster_list * |
5228ad27 | 93 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 94 | { |
95 | struct cluster_list tmp; | |
96 | struct cluster_list *cluster; | |
97 | ||
98 | tmp.length = length; | |
5228ad27 | 99 | tmp.list = pnt; |
718e3744 | 100 | |
101 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
102 | cluster->refcnt++; | |
103 | return cluster; | |
104 | } | |
105 | ||
106 | int | |
107 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
108 | { | |
109 | int i; | |
110 | ||
111 | for (i = 0; i < cluster->length / 4; i++) | |
112 | if (cluster->list[i].s_addr == originator.s_addr) | |
113 | return 1; | |
114 | return 0; | |
115 | } | |
116 | ||
94f2b392 | 117 | static unsigned int |
923de654 | 118 | cluster_hash_key_make (void *p) |
718e3744 | 119 | { |
c8e7b895 | 120 | const struct cluster_list *cluster = p; |
718e3744 | 121 | |
c8e7b895 | 122 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 123 | } |
124 | ||
94f2b392 | 125 | static int |
ffe11cfb | 126 | cluster_hash_cmp (const void *p1, const void *p2) |
718e3744 | 127 | { |
ffe11cfb SH |
128 | const struct cluster_list * cluster1 = p1; |
129 | const struct cluster_list * cluster2 = p2; | |
923de654 | 130 | |
ffe11cfb SH |
131 | return (cluster1->length == cluster2->length && |
132 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 133 | } |
134 | ||
94f2b392 | 135 | static void |
718e3744 | 136 | cluster_free (struct cluster_list *cluster) |
137 | { | |
138 | if (cluster->list) | |
139 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
140 | XFREE (MTYPE_CLUSTER, cluster); | |
141 | } | |
142 | ||
228da428 | 143 | #if 0 |
94f2b392 | 144 | static struct cluster_list * |
718e3744 | 145 | cluster_dup (struct cluster_list *cluster) |
146 | { | |
147 | struct cluster_list *new; | |
148 | ||
393deb9b | 149 | new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); |
718e3744 | 150 | new->length = cluster->length; |
151 | ||
152 | if (cluster->length) | |
153 | { | |
154 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
155 | memcpy (new->list, cluster->list, cluster->length); | |
156 | } | |
157 | else | |
158 | new->list = NULL; | |
159 | ||
160 | return new; | |
161 | } | |
228da428 | 162 | #endif |
718e3744 | 163 | |
94f2b392 | 164 | static struct cluster_list * |
718e3744 | 165 | cluster_intern (struct cluster_list *cluster) |
166 | { | |
167 | struct cluster_list *find; | |
168 | ||
169 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
170 | find->refcnt++; | |
171 | ||
172 | return find; | |
173 | } | |
174 | ||
175 | void | |
176 | cluster_unintern (struct cluster_list *cluster) | |
177 | { | |
178 | struct cluster_list *ret; | |
179 | ||
180 | if (cluster->refcnt) | |
181 | cluster->refcnt--; | |
182 | ||
183 | if (cluster->refcnt == 0) | |
184 | { | |
185 | ret = hash_release (cluster_hash, cluster); | |
186 | cluster_free (cluster); | |
187 | } | |
188 | } | |
189 | ||
94f2b392 | 190 | static void |
191 | cluster_init (void) | |
718e3744 | 192 | { |
193 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp); | |
194 | } | |
228da428 CC |
195 | |
196 | static void | |
197 | cluster_finish (void) | |
198 | { | |
199 | hash_free (cluster_hash); | |
200 | cluster_hash = NULL; | |
201 | } | |
718e3744 | 202 | \f |
203 | /* Unknown transit attribute. */ | |
9bddac4b | 204 | static struct hash *transit_hash; |
718e3744 | 205 | |
94f2b392 | 206 | static void |
718e3744 | 207 | transit_free (struct transit *transit) |
208 | { | |
209 | if (transit->val) | |
210 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
211 | XFREE (MTYPE_TRANSIT, transit); | |
212 | } | |
213 | ||
923de654 | 214 | |
94f2b392 | 215 | static void * |
923de654 | 216 | transit_hash_alloc (void *p) |
718e3744 | 217 | { |
218 | /* Transit structure is already allocated. */ | |
923de654 | 219 | return p; |
718e3744 | 220 | } |
221 | ||
94f2b392 | 222 | static struct transit * |
718e3744 | 223 | transit_intern (struct transit *transit) |
224 | { | |
225 | struct transit *find; | |
226 | ||
227 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
228 | if (find != transit) | |
229 | transit_free (transit); | |
230 | find->refcnt++; | |
231 | ||
232 | return find; | |
233 | } | |
234 | ||
235 | void | |
236 | transit_unintern (struct transit *transit) | |
237 | { | |
238 | struct transit *ret; | |
239 | ||
240 | if (transit->refcnt) | |
241 | transit->refcnt--; | |
242 | ||
243 | if (transit->refcnt == 0) | |
244 | { | |
245 | ret = hash_release (transit_hash, transit); | |
246 | transit_free (transit); | |
247 | } | |
248 | } | |
249 | ||
94f2b392 | 250 | static unsigned int |
923de654 | 251 | transit_hash_key_make (void *p) |
718e3744 | 252 | { |
c8e7b895 | 253 | const struct transit * transit = p; |
718e3744 | 254 | |
c8e7b895 | 255 | return jhash(transit->val, transit->length, 0); |
718e3744 | 256 | } |
257 | ||
94f2b392 | 258 | static int |
ffe11cfb | 259 | transit_hash_cmp (const void *p1, const void *p2) |
718e3744 | 260 | { |
ffe11cfb SH |
261 | const struct transit * transit1 = p1; |
262 | const struct transit * transit2 = p2; | |
923de654 | 263 | |
ffe11cfb SH |
264 | return (transit1->length == transit2->length && |
265 | memcmp (transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 266 | } |
267 | ||
94f2b392 | 268 | static void |
66e5cd87 | 269 | transit_init (void) |
718e3744 | 270 | { |
271 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp); | |
272 | } | |
228da428 CC |
273 | |
274 | static void | |
275 | transit_finish (void) | |
276 | { | |
277 | hash_free (transit_hash); | |
278 | transit_hash = NULL; | |
279 | } | |
718e3744 | 280 | \f |
281 | /* Attribute hash routines. */ | |
9bddac4b | 282 | static struct hash *attrhash; |
718e3744 | 283 | |
fb982c25 PJ |
284 | static struct attr_extra * |
285 | bgp_attr_extra_new (void) | |
286 | { | |
287 | return XCALLOC (MTYPE_ATTR_EXTRA, sizeof (struct attr_extra)); | |
288 | } | |
289 | ||
290 | void | |
291 | bgp_attr_extra_free (struct attr *attr) | |
292 | { | |
293 | if (attr->extra) | |
294 | { | |
295 | XFREE (MTYPE_ATTR_EXTRA, attr->extra); | |
296 | attr->extra = NULL; | |
297 | } | |
298 | } | |
299 | ||
300 | struct attr_extra * | |
301 | bgp_attr_extra_get (struct attr *attr) | |
302 | { | |
303 | if (!attr->extra) | |
304 | attr->extra = bgp_attr_extra_new(); | |
305 | return attr->extra; | |
306 | } | |
307 | ||
308 | /* Shallow copy of an attribute | |
309 | * Though, not so shallow that it doesn't copy the contents | |
310 | * of the attr_extra pointed to by 'extra' | |
311 | */ | |
312 | void | |
313 | bgp_attr_dup (struct attr *new, struct attr *orig) | |
314 | { | |
315 | *new = *orig; | |
316 | if (orig->extra) | |
317 | { | |
318 | new->extra = bgp_attr_extra_new(); | |
319 | *new->extra = *orig->extra; | |
320 | } | |
321 | } | |
322 | ||
cbdfbaa5 PJ |
323 | unsigned long int |
324 | attr_count (void) | |
325 | { | |
326 | return attrhash->count; | |
327 | } | |
328 | ||
329 | unsigned long int | |
330 | attr_unknown_count (void) | |
331 | { | |
332 | return transit_hash->count; | |
333 | } | |
334 | ||
718e3744 | 335 | unsigned int |
923de654 | 336 | attrhash_key_make (void *p) |
718e3744 | 337 | { |
c8e7b895 SH |
338 | const struct attr * attr = (struct attr *) p; |
339 | uint32_t key = 0; | |
340 | #define MIX(val) key = jhash_1word(val, key) | |
341 | ||
342 | MIX(attr->origin); | |
343 | MIX(attr->nexthop.s_addr); | |
344 | MIX(attr->med); | |
345 | MIX(attr->local_pref); | |
718e3744 | 346 | |
c8f3fe30 PJ |
347 | key += attr->origin; |
348 | key += attr->nexthop.s_addr; | |
349 | key += attr->med; | |
350 | key += attr->local_pref; | |
fb982c25 PJ |
351 | |
352 | if (attr->extra) | |
353 | { | |
c8e7b895 SH |
354 | MIX(attr->extra->aggregator_as); |
355 | MIX(attr->extra->aggregator_addr.s_addr); | |
356 | MIX(attr->extra->weight); | |
357 | MIX(attr->extra->mp_nexthop_global_in.s_addr); | |
fb982c25 PJ |
358 | } |
359 | ||
718e3744 | 360 | if (attr->aspath) |
c8e7b895 | 361 | MIX(aspath_key_make (attr->aspath)); |
718e3744 | 362 | if (attr->community) |
c8e7b895 | 363 | MIX(community_hash_make (attr->community)); |
fb982c25 PJ |
364 | |
365 | if (attr->extra) | |
366 | { | |
367 | if (attr->extra->ecommunity) | |
c8e7b895 | 368 | MIX(ecommunity_hash_make (attr->extra->ecommunity)); |
fb982c25 | 369 | if (attr->extra->cluster) |
c8e7b895 | 370 | MIX(cluster_hash_key_make (attr->extra->cluster)); |
fb982c25 | 371 | if (attr->extra->transit) |
c8e7b895 | 372 | MIX(transit_hash_key_make (attr->extra->transit)); |
718e3744 | 373 | |
374 | #ifdef HAVE_IPV6 | |
c8e7b895 | 375 | MIX(attr->extra->mp_nexthop_len); |
31d0f1b3 PJ |
376 | key = jhash(attr->extra->mp_nexthop_global.s6_addr, 16, key); |
377 | key = jhash(attr->extra->mp_nexthop_local.s6_addr, 16, key); | |
718e3744 | 378 | #endif /* HAVE_IPV6 */ |
fb982c25 | 379 | } |
718e3744 | 380 | |
381 | return key; | |
382 | } | |
383 | ||
384 | int | |
ffe11cfb | 385 | attrhash_cmp (const void *p1, const void *p2) |
718e3744 | 386 | { |
ffe11cfb SH |
387 | const struct attr * attr1 = p1; |
388 | const struct attr * attr2 = p2; | |
923de654 | 389 | |
718e3744 | 390 | if (attr1->flag == attr2->flag |
391 | && attr1->origin == attr2->origin | |
392 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
fb982c25 PJ |
393 | && attr1->aspath == attr2->aspath |
394 | && attr1->community == attr2->community | |
718e3744 | 395 | && attr1->med == attr2->med |
c8f3fe30 | 396 | && attr1->local_pref == attr2->local_pref) |
fb982c25 | 397 | { |
ffe11cfb SH |
398 | const struct attr_extra *ae1 = attr1->extra; |
399 | const struct attr_extra *ae2 = attr2->extra; | |
fb982c25 PJ |
400 | |
401 | if (ae1 && ae2 | |
402 | && ae1->aggregator_as == ae2->aggregator_as | |
403 | && ae1->aggregator_addr.s_addr == ae2->aggregator_addr.s_addr | |
404 | && ae1->weight == ae2->weight | |
718e3744 | 405 | #ifdef HAVE_IPV6 |
fb982c25 PJ |
406 | && ae1->mp_nexthop_len == ae2->mp_nexthop_len |
407 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_global, &ae2->mp_nexthop_global) | |
408 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_local, &ae2->mp_nexthop_local) | |
718e3744 | 409 | #endif /* HAVE_IPV6 */ |
fb982c25 PJ |
410 | && IPV4_ADDR_SAME (&ae1->mp_nexthop_global_in, &ae2->mp_nexthop_global_in) |
411 | && ae1->ecommunity == ae2->ecommunity | |
412 | && ae1->cluster == ae2->cluster | |
413 | && ae1->transit == ae2->transit) | |
414 | return 1; | |
415 | else if (ae1 || ae2) | |
416 | return 0; | |
417 | /* neither attribute has extra attributes, so they're same */ | |
418 | return 1; | |
419 | } | |
718e3744 | 420 | else |
421 | return 0; | |
422 | } | |
423 | ||
94f2b392 | 424 | static void |
ffe11cfb | 425 | attrhash_init (void) |
718e3744 | 426 | { |
427 | attrhash = hash_create (attrhash_key_make, attrhash_cmp); | |
428 | } | |
429 | ||
228da428 CC |
430 | static void |
431 | attrhash_finish (void) | |
432 | { | |
433 | hash_free (attrhash); | |
434 | attrhash = NULL; | |
435 | } | |
436 | ||
94f2b392 | 437 | static void |
718e3744 | 438 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
439 | { | |
440 | struct attr *attr = backet->data; | |
441 | ||
442 | vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt, | |
443 | inet_ntoa (attr->nexthop), VTY_NEWLINE); | |
444 | } | |
445 | ||
446 | void | |
447 | attr_show_all (struct vty *vty) | |
448 | { | |
449 | hash_iterate (attrhash, | |
450 | (void (*)(struct hash_backet *, void *)) | |
451 | attr_show_all_iterator, | |
452 | vty); | |
453 | } | |
454 | ||
94f2b392 | 455 | static void * |
923de654 | 456 | bgp_attr_hash_alloc (void *p) |
718e3744 | 457 | { |
923de654 | 458 | struct attr * val = (struct attr *) p; |
718e3744 | 459 | struct attr *attr; |
460 | ||
461 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
462 | *attr = *val; | |
fb982c25 PJ |
463 | if (val->extra) |
464 | { | |
465 | attr->extra = bgp_attr_extra_new (); | |
466 | *attr->extra = *val->extra; | |
467 | } | |
718e3744 | 468 | attr->refcnt = 0; |
469 | return attr; | |
470 | } | |
471 | ||
472 | /* Internet argument attribute. */ | |
473 | struct attr * | |
474 | bgp_attr_intern (struct attr *attr) | |
475 | { | |
476 | struct attr *find; | |
477 | ||
478 | /* Intern referenced strucutre. */ | |
479 | if (attr->aspath) | |
480 | { | |
481 | if (! attr->aspath->refcnt) | |
482 | attr->aspath = aspath_intern (attr->aspath); | |
483 | else | |
484 | attr->aspath->refcnt++; | |
485 | } | |
486 | if (attr->community) | |
487 | { | |
488 | if (! attr->community->refcnt) | |
489 | attr->community = community_intern (attr->community); | |
490 | else | |
491 | attr->community->refcnt++; | |
492 | } | |
fb982c25 | 493 | if (attr->extra) |
718e3744 | 494 | { |
fb982c25 PJ |
495 | struct attr_extra *attre = attr->extra; |
496 | ||
497 | if (attre->ecommunity) | |
498 | { | |
499 | if (! attre->ecommunity->refcnt) | |
500 | attre->ecommunity = ecommunity_intern (attre->ecommunity); | |
501 | else | |
502 | attre->ecommunity->refcnt++; | |
f6f434b2 | 503 | |
fb982c25 PJ |
504 | } |
505 | if (attre->cluster) | |
506 | { | |
507 | if (! attre->cluster->refcnt) | |
508 | attre->cluster = cluster_intern (attre->cluster); | |
509 | else | |
510 | attre->cluster->refcnt++; | |
511 | } | |
512 | if (attre->transit) | |
513 | { | |
514 | if (! attre->transit->refcnt) | |
515 | attre->transit = transit_intern (attre->transit); | |
516 | else | |
517 | attre->transit->refcnt++; | |
518 | } | |
718e3744 | 519 | } |
f6f434b2 | 520 | |
718e3744 | 521 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); |
522 | find->refcnt++; | |
f6f434b2 | 523 | |
718e3744 | 524 | return find; |
525 | } | |
526 | ||
03e214c8 | 527 | |
718e3744 | 528 | /* Make network statement's attribute. */ |
529 | struct attr * | |
530 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
531 | { | |
532 | memset (attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
533 | bgp_attr_extra_get (attr); |
534 | ||
718e3744 | 535 | attr->origin = origin; |
536 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
537 | attr->aspath = aspath_empty (); | |
538 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
fb982c25 | 539 | attr->extra->weight = BGP_ATTR_DEFAULT_WEIGHT; |
718e3744 | 540 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
541 | #ifdef HAVE_IPV6 | |
fb982c25 | 542 | attr->extra->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 543 | #endif |
03e214c8 | 544 | |
718e3744 | 545 | return attr; |
546 | } | |
547 | ||
03e214c8 | 548 | |
718e3744 | 549 | /* Make network statement's attribute. */ |
550 | struct attr * | |
551 | bgp_attr_default_intern (u_char origin) | |
552 | { | |
553 | struct attr attr; | |
554 | struct attr *new; | |
fb982c25 PJ |
555 | struct attr_extra *attre; |
556 | ||
557 | memset (&attr, 0, sizeof (struct attr)); | |
558 | attre = bgp_attr_extra_get (&attr); | |
559 | ||
03e214c8 | 560 | bgp_attr_default_set(&attr, origin); |
718e3744 | 561 | |
562 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
563 | bgp_attr_extra_free (&attr); |
564 | ||
f6f434b2 | 565 | aspath_unintern (&new->aspath); |
718e3744 | 566 | return new; |
567 | } | |
568 | ||
569 | struct attr * | |
570 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
571 | struct aspath *aspath, | |
572 | struct community *community, int as_set) | |
573 | { | |
574 | struct attr attr; | |
575 | struct attr *new; | |
fb982c25 | 576 | struct attr_extra *attre; |
718e3744 | 577 | |
578 | memset (&attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
579 | attre = bgp_attr_extra_get (&attr); |
580 | ||
718e3744 | 581 | /* Origin attribute. */ |
582 | attr.origin = origin; | |
583 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
584 | ||
585 | /* AS path attribute. */ | |
586 | if (aspath) | |
587 | attr.aspath = aspath_intern (aspath); | |
588 | else | |
589 | attr.aspath = aspath_empty (); | |
590 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
591 | ||
592 | /* Next hop attribute. */ | |
593 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
594 | ||
595 | if (community) | |
596 | { | |
597 | attr.community = community; | |
598 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
599 | } | |
600 | ||
fb982c25 | 601 | attre->weight = BGP_ATTR_DEFAULT_WEIGHT; |
718e3744 | 602 | #ifdef HAVE_IPV6 |
fb982c25 | 603 | attre->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 604 | #endif |
605 | if (! as_set) | |
606 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
607 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
608 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
fb982c25 | 609 | attre->aggregator_as = bgp->confed_id; |
718e3744 | 610 | else |
fb982c25 PJ |
611 | attre->aggregator_as = bgp->as; |
612 | attre->aggregator_addr = bgp->router_id; | |
718e3744 | 613 | |
614 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
615 | bgp_attr_extra_free (&attr); |
616 | ||
f6f434b2 | 617 | aspath_unintern (&new->aspath); |
718e3744 | 618 | return new; |
619 | } | |
620 | ||
b881c707 PJ |
621 | /* Unintern just the sub-components of the attr, but not the attr */ |
622 | void | |
623 | bgp_attr_unintern_sub (struct attr *attr) | |
624 | { | |
625 | /* aspath refcount shoud be decrement. */ | |
626 | if (attr->aspath) | |
627 | aspath_unintern (&attr->aspath); | |
628 | UNSET_FLAG(attr->flag, BGP_ATTR_AS_PATH); | |
629 | ||
630 | if (attr->community) | |
631 | community_unintern (&attr->community); | |
632 | UNSET_FLAG(attr->flag, BGP_ATTR_COMMUNITIES); | |
633 | ||
634 | if (attr->extra) | |
635 | { | |
636 | if (attr->extra->ecommunity) | |
637 | ecommunity_unintern (&attr->extra->ecommunity); | |
638 | UNSET_FLAG(attr->flag, BGP_ATTR_EXT_COMMUNITIES); | |
639 | ||
640 | if (attr->extra->cluster) | |
641 | cluster_unintern (attr->extra->cluster); | |
642 | UNSET_FLAG(attr->flag, BGP_ATTR_CLUSTER_LIST); | |
643 | ||
644 | if (attr->extra->transit) | |
645 | transit_unintern (attr->extra->transit); | |
646 | } | |
647 | } | |
648 | ||
718e3744 | 649 | /* Free bgp attribute and aspath. */ |
650 | void | |
f6f434b2 | 651 | bgp_attr_unintern (struct attr **attr) |
718e3744 | 652 | { |
653 | struct attr *ret; | |
b881c707 | 654 | struct attr tmp; |
f6f434b2 | 655 | |
718e3744 | 656 | /* Decrement attribute reference. */ |
f6f434b2 | 657 | (*attr)->refcnt--; |
b881c707 PJ |
658 | |
659 | tmp = *(*attr); | |
660 | ||
f6f434b2 | 661 | if ((*attr)->extra) |
fb982c25 | 662 | { |
b881c707 PJ |
663 | tmp.extra = bgp_attr_extra_new (); |
664 | memcpy (tmp.extra, (*attr)->extra, sizeof (struct attr_extra)); | |
fb982c25 | 665 | } |
f6f434b2 | 666 | |
718e3744 | 667 | /* If reference becomes zero then free attribute object. */ |
f6f434b2 | 668 | if ((*attr)->refcnt == 0) |
718e3744 | 669 | { |
f6f434b2 | 670 | ret = hash_release (attrhash, *attr); |
718e3744 | 671 | assert (ret != NULL); |
f6f434b2 PJ |
672 | bgp_attr_extra_free (*attr); |
673 | XFREE (MTYPE_ATTR, *attr); | |
674 | *attr = NULL; | |
718e3744 | 675 | } |
676 | ||
b881c707 | 677 | bgp_attr_unintern_sub (&tmp); |
718e3744 | 678 | } |
679 | ||
680 | void | |
681 | bgp_attr_flush (struct attr *attr) | |
682 | { | |
683 | if (attr->aspath && ! attr->aspath->refcnt) | |
684 | aspath_free (attr->aspath); | |
685 | if (attr->community && ! attr->community->refcnt) | |
686 | community_free (attr->community); | |
fb982c25 PJ |
687 | if (attr->extra) |
688 | { | |
689 | struct attr_extra *attre = attr->extra; | |
f6f434b2 | 690 | |
fb982c25 | 691 | if (attre->ecommunity && ! attre->ecommunity->refcnt) |
f6f434b2 | 692 | ecommunity_free (&attre->ecommunity); |
fb982c25 PJ |
693 | if (attre->cluster && ! attre->cluster->refcnt) |
694 | cluster_free (attre->cluster); | |
695 | if (attre->transit && ! attre->transit->refcnt) | |
696 | transit_free (attre->transit); | |
697 | } | |
718e3744 | 698 | } |
699 | ||
b881c707 PJ |
700 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
701 | * avoid resetting sessions for malformed attributes which are | |
702 | * are partial/optional and hence where the error likely was not | |
703 | * introduced by the sending neighbour. | |
704 | */ | |
705 | static bgp_attr_parse_ret_t | |
706 | bgp_attr_malformed (struct peer *peer, u_char type, u_char flag, | |
707 | u_char subcode, u_char *startp, bgp_size_t length) | |
708 | { | |
709 | /* Only relax error handling for eBGP peers */ | |
710 | if (peer_sort (peer) != BGP_PEER_EBGP) | |
711 | { | |
712 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
713 | startp, length); | |
714 | return BGP_ATTR_PARSE_ERROR; | |
715 | ||
716 | } | |
717 | ||
718 | switch (type) { | |
719 | /* where an optional attribute is inconsequential, e.g. it does not affect | |
720 | * route selection, and can be safely ignored then any such attributes | |
721 | * which are malformed should just be ignored and the route processed as | |
722 | * normal. | |
723 | */ | |
724 | case BGP_ATTR_AS4_AGGREGATOR: | |
725 | case BGP_ATTR_AGGREGATOR: | |
726 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
727 | return BGP_ATTR_PARSE_PROCEED; | |
728 | ||
729 | /* Core attributes, particularly ones which may influence route | |
730 | * selection should always cause session resets | |
731 | */ | |
732 | case BGP_ATTR_ORIGIN: | |
733 | case BGP_ATTR_AS_PATH: | |
734 | case BGP_ATTR_NEXT_HOP: | |
735 | case BGP_ATTR_MULTI_EXIT_DISC: | |
736 | case BGP_ATTR_LOCAL_PREF: | |
737 | case BGP_ATTR_COMMUNITIES: | |
738 | case BGP_ATTR_ORIGINATOR_ID: | |
739 | case BGP_ATTR_CLUSTER_LIST: | |
740 | case BGP_ATTR_MP_REACH_NLRI: | |
741 | case BGP_ATTR_MP_UNREACH_NLRI: | |
742 | case BGP_ATTR_EXT_COMMUNITIES: | |
743 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
744 | startp, length); | |
745 | return BGP_ATTR_PARSE_ERROR; | |
746 | } | |
747 | ||
748 | /* Partial optional attributes that are malformed should not cause | |
749 | * the whole session to be reset. Instead treat it as a withdrawal | |
750 | * of the routes, if possible. | |
751 | */ | |
752 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS) | |
753 | && CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
754 | && CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL)) | |
755 | return BGP_ATTR_PARSE_WITHDRAW; | |
756 | ||
757 | /* default to reset */ | |
758 | return BGP_ATTR_PARSE_ERROR; | |
759 | } | |
760 | ||
718e3744 | 761 | /* Get origin attribute of the update message. */ |
b881c707 | 762 | static bgp_attr_parse_ret_t |
718e3744 | 763 | bgp_attr_origin (struct peer *peer, bgp_size_t length, |
764 | struct attr *attr, u_char flag, u_char *startp) | |
765 | { | |
766 | bgp_size_t total; | |
767 | ||
768 | /* total is entire attribute length include Attribute Flags (1), | |
769 | Attribute Type code (1) and Attribute length (1 or 2). */ | |
770 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
771 | ||
772 | /* If any recognized attribute has Attribute Flags that conflict | |
773 | with the Attribute Type Code, then the Error Subcode is set to | |
774 | Attribute Flags Error. The Data field contains the erroneous | |
775 | attribute (type, length and value). */ | |
776 | if (flag != BGP_ATTR_FLAG_TRANS) | |
777 | { | |
778 | zlog (peer->log, LOG_ERR, | |
779 | "Origin attribute flag isn't transitive %d", flag); | |
b881c707 PJ |
780 | return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag, |
781 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
782 | startp, total); | |
718e3744 | 783 | } |
784 | ||
785 | /* If any recognized attribute has Attribute Length that conflicts | |
786 | with the expected length (based on the attribute type code), then | |
787 | the Error Subcode is set to Attribute Length Error. The Data | |
788 | field contains the erroneous attribute (type, length and | |
789 | value). */ | |
790 | if (length != 1) | |
791 | { | |
792 | zlog (peer->log, LOG_ERR, "Origin attribute length is not one %d", | |
793 | length); | |
b881c707 PJ |
794 | return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag, |
795 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
796 | startp, total); | |
718e3744 | 797 | } |
798 | ||
799 | /* Fetch origin attribute. */ | |
800 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
801 | ||
802 | /* If the ORIGIN attribute has an undefined value, then the Error | |
803 | Subcode is set to Invalid Origin Attribute. The Data field | |
804 | contains the unrecognized attribute (type, length and value). */ | |
805 | if ((attr->origin != BGP_ORIGIN_IGP) | |
806 | && (attr->origin != BGP_ORIGIN_EGP) | |
807 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
808 | { | |
809 | zlog (peer->log, LOG_ERR, "Origin attribute value is invalid %d", | |
810 | attr->origin); | |
b881c707 PJ |
811 | return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag, |
812 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
813 | startp, total); | |
718e3744 | 814 | } |
815 | ||
816 | /* Set oring attribute flag. */ | |
817 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
818 | ||
819 | return 0; | |
820 | } | |
ab005298 PJ |
821 | |
822 | /* Parse AS path information. This function is wrapper of | |
823 | aspath_parse. */ | |
824 | static int | |
718e3744 | 825 | bgp_attr_aspath (struct peer *peer, bgp_size_t length, |
ab005298 | 826 | struct attr *attr, u_char flag, u_char *startp) |
718e3744 | 827 | { |
ab005298 | 828 | bgp_size_t total; |
718e3744 | 829 | |
ab005298 | 830 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); |
718e3744 | 831 | |
ab005298 PJ |
832 | /* Flag check. */ |
833 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
834 | || ! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
718e3744 | 835 | { |
836 | zlog (peer->log, LOG_ERR, | |
ab005298 | 837 | "As-Path attribute flag isn't transitive %d", flag); |
b881c707 PJ |
838 | return bgp_attr_malformed (peer, BGP_ATTR_AS_PATH, flag, |
839 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
840 | startp, total); | |
ab005298 | 841 | } |
cddb8112 | 842 | |
ab005298 PJ |
843 | /* |
844 | * peer with AS4 => will get 4Byte ASnums | |
845 | * otherwise, will get 16 Bit | |
0b2aa3a0 | 846 | */ |
ab005298 PJ |
847 | attr->aspath = aspath_parse (peer->ibuf, length, |
848 | CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)); | |
0b2aa3a0 | 849 | |
ab005298 PJ |
850 | /* In case of IBGP, length will be zero. */ |
851 | if (! attr->aspath) | |
cddb8112 | 852 | { |
b881c707 PJ |
853 | zlog (peer->log, LOG_ERR, |
854 | "Malformed AS path from %s, length is %d", | |
855 | peer->host, length); | |
856 | return bgp_attr_malformed (peer, BGP_ATTR_AS_PATH, flag, | |
857 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
858 | NULL, 0); | |
cddb8112 | 859 | } |
cddb8112 | 860 | |
ab005298 PJ |
861 | /* Set aspath attribute flag. */ |
862 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
0b2aa3a0 | 863 | |
b881c707 | 864 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
865 | } |
866 | ||
b881c707 PJ |
867 | static bgp_attr_parse_ret_t |
868 | bgp_attr_aspath_check (struct peer *peer, struct attr *attr, u_char flag) | |
0b2aa3a0 PJ |
869 | { |
870 | /* These checks were part of bgp_attr_aspath, but with | |
871 | * as4 we should to check aspath things when | |
872 | * aspath synthesizing with as4_path has already taken place. | |
873 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
874 | * not right. | |
875 | * So do the checks later, i.e. here | |
876 | */ | |
877 | struct bgp *bgp = peer->bgp; | |
878 | struct aspath *aspath; | |
879 | ||
718e3744 | 880 | bgp = peer->bgp; |
881 | ||
ca87e1d3 VT |
882 | /* Confederation sanity check. */ |
883 | if ((peer_sort (peer) == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) || | |
884 | (peer_sort (peer) == BGP_PEER_EBGP && aspath_confed_check (attr->aspath))) | |
885 | { | |
886 | zlog (peer->log, LOG_ERR, "Malformed AS path from %s", peer->host); | |
b881c707 PJ |
887 | return bgp_attr_malformed (peer, BGP_ATTR_AS_PATH, flag, |
888 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
889 | NULL, 0); | |
ca87e1d3 VT |
890 | } |
891 | ||
718e3744 | 892 | /* First AS check for EBGP. */ |
893 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
894 | { | |
895 | if (peer_sort (peer) == BGP_PEER_EBGP | |
896 | && ! aspath_firstas_check (attr->aspath, peer->as)) | |
897 | { | |
898 | zlog (peer->log, LOG_ERR, | |
aea339f7 | 899 | "%s incorrect first AS (must be %u)", peer->host, peer->as); |
b881c707 PJ |
900 | return bgp_attr_malformed (peer, BGP_ATTR_AS_PATH, flag, |
901 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
902 | NULL, 0); | |
718e3744 | 903 | } |
904 | } | |
905 | ||
906 | /* local-as prepend */ | |
907 | if (peer->change_local_as && | |
908 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
909 | { | |
910 | aspath = aspath_dup (attr->aspath); | |
911 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
f6f434b2 | 912 | aspath_unintern (&attr->aspath); |
718e3744 | 913 | attr->aspath = aspath_intern (aspath); |
914 | } | |
915 | ||
b881c707 | 916 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
917 | } |
918 | ||
ab005298 PJ |
919 | /* Parse AS4 path information. This function is another wrapper of |
920 | aspath_parse. */ | |
921 | static int | |
b881c707 PJ |
922 | bgp_attr_as4_path (struct peer *peer, bgp_size_t length, |
923 | struct attr *attr, u_char flag, u_char *startp, | |
924 | struct aspath **as4_path) | |
ab005298 | 925 | { |
b881c707 PJ |
926 | bgp_size_t total; |
927 | ||
928 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
0b2aa3a0 | 929 | |
b881c707 PJ |
930 | /* Flag check. */ |
931 | if (!CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
932 | || !CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
933 | { | |
934 | zlog (peer->log, LOG_ERR, | |
935 | "As4-Path attribute flag isn't optional/transitive %d", flag); | |
936 | return bgp_attr_malformed (peer, BGP_ATTR_AS_PATH, flag, | |
937 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
938 | startp, total); | |
939 | } | |
940 | ||
ab005298 PJ |
941 | *as4_path = aspath_parse (peer->ibuf, length, 1); |
942 | ||
b881c707 PJ |
943 | /* In case of IBGP, length will be zero. */ |
944 | if (!*as4_path) | |
945 | { | |
946 | zlog (peer->log, LOG_ERR, | |
947 | "Malformed AS4 path from %s, length is %d", | |
948 | peer->host, length); | |
949 | return bgp_attr_malformed (peer, BGP_ATTR_AS4_PATH, flag, | |
950 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
951 | NULL, 0); | |
952 | } | |
953 | ||
ab005298 PJ |
954 | /* Set aspath attribute flag. */ |
955 | if (as4_path) | |
956 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_PATH); | |
957 | ||
b881c707 | 958 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
959 | } |
960 | ||
718e3744 | 961 | /* Nexthop attribute. */ |
b881c707 | 962 | static bgp_attr_parse_ret_t |
718e3744 | 963 | bgp_attr_nexthop (struct peer *peer, bgp_size_t length, |
964 | struct attr *attr, u_char flag, u_char *startp) | |
965 | { | |
966 | bgp_size_t total; | |
967 | ||
968 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
969 | ||
970 | /* Flag check. */ | |
971 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL) | |
972 | || ! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
973 | { | |
974 | zlog (peer->log, LOG_ERR, | |
975 | "Origin attribute flag isn't transitive %d", flag); | |
b881c707 PJ |
976 | return bgp_attr_malformed (peer, BGP_ATTR_NEXT_HOP, flag, |
977 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
978 | startp, total); | |
718e3744 | 979 | } |
980 | ||
981 | /* Check nexthop attribute length. */ | |
982 | if (length != 4) | |
983 | { | |
984 | zlog (peer->log, LOG_ERR, "Nexthop attribute length isn't four [%d]", | |
985 | length); | |
986 | ||
b881c707 PJ |
987 | return bgp_attr_malformed (peer, BGP_ATTR_NEXT_HOP, flag, |
988 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
989 | startp, total); | |
718e3744 | 990 | } |
991 | ||
992 | attr->nexthop.s_addr = stream_get_ipv4 (peer->ibuf); | |
993 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
994 | ||
b881c707 | 995 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 996 | } |
997 | ||
998 | /* MED atrribute. */ | |
b881c707 | 999 | static bgp_attr_parse_ret_t |
718e3744 | 1000 | bgp_attr_med (struct peer *peer, bgp_size_t length, |
1001 | struct attr *attr, u_char flag, u_char *startp) | |
1002 | { | |
1003 | bgp_size_t total; | |
1004 | ||
1005 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1006 | ||
2cfadf09 DO |
1007 | /* Flag checks. */ |
1008 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) | |
1009 | { | |
1010 | zlog (peer->log, LOG_ERR, | |
1011 | "MULTI_EXIT_DISC attribute must be flagged as \"optional\" (%u)", flag); | |
1012 | bgp_notify_send_with_data (peer, | |
1013 | BGP_NOTIFY_UPDATE_ERR, | |
1014 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1015 | startp, total); | |
1016 | return -1; | |
1017 | } | |
1018 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
1019 | { | |
1020 | zlog (peer->log, LOG_ERR, | |
1021 | "MULTI_EXIT_DISC attribute must not be flagged as \"transitive\" (%u)", flag); | |
1022 | bgp_notify_send_with_data (peer, | |
1023 | BGP_NOTIFY_UPDATE_ERR, | |
1024 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1025 | startp, total); | |
1026 | return -1; | |
1027 | } | |
1028 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL)) | |
1029 | { | |
1030 | zlog (peer->log, LOG_ERR, | |
1031 | "MULTI_EXIT_DISC attribute must not be flagged as \"partial\" (%u)", flag); | |
1032 | bgp_notify_send_with_data (peer, | |
1033 | BGP_NOTIFY_UPDATE_ERR, | |
1034 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1035 | startp, total); | |
1036 | return -1; | |
1037 | } | |
1038 | ||
718e3744 | 1039 | /* Length check. */ |
1040 | if (length != 4) | |
1041 | { | |
1042 | zlog (peer->log, LOG_ERR, | |
1043 | "MED attribute length isn't four [%d]", length); | |
b881c707 PJ |
1044 | |
1045 | return bgp_attr_malformed (peer, BGP_ATTR_MULTI_EXIT_DISC, flag, | |
1046 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1047 | startp, total); | |
718e3744 | 1048 | } |
1049 | ||
1050 | attr->med = stream_getl (peer->ibuf); | |
1051 | ||
1052 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
1053 | ||
b881c707 | 1054 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1055 | } |
1056 | ||
1057 | /* Local preference attribute. */ | |
b881c707 | 1058 | static bgp_attr_parse_ret_t |
718e3744 | 1059 | bgp_attr_local_pref (struct peer *peer, bgp_size_t length, |
0ea968d2 | 1060 | struct attr *attr, u_char flag, u_char *startp) |
718e3744 | 1061 | { |
0ea968d2 DO |
1062 | bgp_size_t total; |
1063 | ||
1064 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1065 | /* Flag checks. */ | |
1066 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) | |
1067 | { | |
1068 | zlog (peer->log, LOG_ERR, | |
1069 | "LOCAL_PREF attribute must be flagged as \"well-known\" (%u)", flag); | |
1070 | bgp_notify_send_with_data (peer, | |
1071 | BGP_NOTIFY_UPDATE_ERR, | |
1072 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1073 | startp, total); | |
1074 | return -1; | |
1075 | } | |
1076 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
1077 | { | |
1078 | zlog (peer->log, LOG_ERR, | |
1079 | "LOCAL_PREF attribute must be flagged as \"transitive\" (%u)", flag); | |
1080 | bgp_notify_send_with_data (peer, | |
1081 | BGP_NOTIFY_UPDATE_ERR, | |
1082 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1083 | startp, total); | |
1084 | return -1; | |
1085 | } | |
1086 | ||
718e3744 | 1087 | /* If it is contained in an UPDATE message that is received from an |
1088 | external peer, then this attribute MUST be ignored by the | |
1089 | receiving speaker. */ | |
1090 | if (peer_sort (peer) == BGP_PEER_EBGP) | |
1091 | { | |
9985f83c | 1092 | stream_forward_getp (peer->ibuf, length); |
b881c707 | 1093 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1094 | } |
1095 | ||
1096 | if (length == 4) | |
1097 | attr->local_pref = stream_getl (peer->ibuf); | |
1098 | else | |
1099 | attr->local_pref = 0; | |
1100 | ||
1101 | /* Set atomic aggregate flag. */ | |
1102 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
1103 | ||
b881c707 | 1104 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1105 | } |
1106 | ||
1107 | /* Atomic aggregate. */ | |
94f2b392 | 1108 | static int |
718e3744 | 1109 | bgp_attr_atomic (struct peer *peer, bgp_size_t length, |
9eba2ada | 1110 | struct attr *attr, u_char flag, u_char *startp) |
718e3744 | 1111 | { |
9eba2ada DO |
1112 | bgp_size_t total; |
1113 | ||
1114 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1115 | /* Flag checks. */ | |
1116 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) | |
1117 | { | |
1118 | zlog (peer->log, LOG_ERR, | |
1119 | "ATOMIC_AGGREGATE attribute must not be flagged as \"optional\" (%u)", flag); | |
1120 | bgp_notify_send_with_data (peer, | |
1121 | BGP_NOTIFY_UPDATE_ERR, | |
1122 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1123 | startp, total); | |
1124 | return -1; | |
1125 | } | |
1126 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
1127 | { | |
1128 | zlog (peer->log, LOG_ERR, | |
1129 | "ATOMIC_AGGREGATE attribute must be flagged as \"transitive\" (%u)", flag); | |
1130 | bgp_notify_send_with_data (peer, | |
1131 | BGP_NOTIFY_UPDATE_ERR, | |
1132 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1133 | startp, total); | |
1134 | return -1; | |
1135 | } | |
1136 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL)) | |
1137 | { | |
1138 | zlog (peer->log, LOG_ERR, | |
1139 | "ATOMIC_AGGREGATE attribute must not be flagged as \"partial\" (%u)", flag); | |
1140 | bgp_notify_send_with_data (peer, | |
1141 | BGP_NOTIFY_UPDATE_ERR, | |
1142 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1143 | startp, total); | |
1144 | return -1; | |
1145 | } | |
1146 | ||
1147 | /* Length check. */ | |
718e3744 | 1148 | if (length != 0) |
1149 | { | |
1150 | zlog (peer->log, LOG_ERR, "Bad atomic aggregate length %d", length); | |
1151 | ||
b881c707 PJ |
1152 | return bgp_attr_malformed (peer, BGP_ATTR_ATOMIC_AGGREGATE, flag, |
1153 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1154 | NULL, 0); | |
718e3744 | 1155 | } |
1156 | ||
1157 | /* Set atomic aggregate flag. */ | |
1158 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
1159 | ||
b881c707 | 1160 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1161 | } |
1162 | ||
1163 | /* Aggregator attribute */ | |
94f2b392 | 1164 | static int |
718e3744 | 1165 | bgp_attr_aggregator (struct peer *peer, bgp_size_t length, |
1166 | struct attr *attr, u_char flag) | |
1167 | { | |
0b2aa3a0 | 1168 | int wantedlen = 6; |
fb982c25 PJ |
1169 | struct attr_extra *attre = bgp_attr_extra_get (attr); |
1170 | ||
0b2aa3a0 | 1171 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ |
b881c707 | 1172 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1173 | wantedlen = 8; |
1174 | ||
1175 | if (length != wantedlen) | |
718e3744 | 1176 | { |
0b2aa3a0 | 1177 | zlog (peer->log, LOG_ERR, "Aggregator length is not %d [%d]", wantedlen, length); |
718e3744 | 1178 | |
b881c707 PJ |
1179 | return bgp_attr_malformed (peer, BGP_ATTR_AGGREGATOR, flag, |
1180 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1181 | NULL, 0); | |
718e3744 | 1182 | } |
0b2aa3a0 PJ |
1183 | |
1184 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
1185 | attre->aggregator_as = stream_getl (peer->ibuf); | |
1186 | else | |
1187 | attre->aggregator_as = stream_getw (peer->ibuf); | |
fb982c25 | 1188 | attre->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); |
718e3744 | 1189 | |
1190 | /* Set atomic aggregate flag. */ | |
1191 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1192 | ||
b881c707 | 1193 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1194 | } |
1195 | ||
0b2aa3a0 | 1196 | /* New Aggregator attribute */ |
b881c707 | 1197 | static bgp_attr_parse_ret_t |
0b2aa3a0 | 1198 | bgp_attr_as4_aggregator (struct peer *peer, bgp_size_t length, |
b881c707 PJ |
1199 | struct attr *attr, u_char flag, |
1200 | as_t *as4_aggregator_as, | |
0b2aa3a0 PJ |
1201 | struct in_addr *as4_aggregator_addr) |
1202 | { | |
1203 | if (length != 8) | |
1204 | { | |
1205 | zlog (peer->log, LOG_ERR, "New Aggregator length is not 8 [%d]", length); | |
b881c707 PJ |
1206 | return bgp_attr_malformed (peer, BGP_ATTR_AS4_AGGREGATOR, flag, |
1207 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1208 | NULL, 0); | |
0b2aa3a0 PJ |
1209 | } |
1210 | *as4_aggregator_as = stream_getl (peer->ibuf); | |
1211 | as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf); | |
1212 | ||
1213 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR); | |
1214 | ||
b881c707 | 1215 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1216 | } |
1217 | ||
1218 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1219 | */ | |
b881c707 PJ |
1220 | static bgp_attr_parse_ret_t |
1221 | bgp_attr_munge_as4_attrs (struct peer *peer, struct attr *attr, u_char flag, | |
0b2aa3a0 PJ |
1222 | struct aspath *as4_path, as_t as4_aggregator, |
1223 | struct in_addr *as4_aggregator_addr) | |
1224 | { | |
1225 | int ignore_as4_path = 0; | |
1226 | struct aspath *newpath; | |
1227 | struct attr_extra *attre = attr->extra; | |
1228 | ||
b881c707 | 1229 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1230 | { |
1231 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1232 | * if given. | |
1233 | * It is worth a warning though, because the peer really | |
1234 | * should not send them | |
1235 | */ | |
1236 | if (BGP_DEBUG(as4, AS4)) | |
1237 | { | |
1238 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1239 | zlog_debug ("[AS4] %s %s AS4_PATH", | |
1240 | peer->host, "AS4 capable peer, yet it sent"); | |
1241 | ||
1242 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1243 | zlog_debug ("[AS4] %s %s AS4_AGGREGATOR", | |
1244 | peer->host, "AS4 capable peer, yet it sent"); | |
1245 | } | |
1246 | ||
b881c707 | 1247 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1248 | } |
1249 | ||
b881c707 PJ |
1250 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_PATH)) |
1251 | && !(attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)))) | |
0b2aa3a0 PJ |
1252 | { |
1253 | /* Hu? This is not supposed to happen at all! | |
1254 | * got as4_path and no aspath, | |
1255 | * This should already | |
1256 | * have been handled by 'well known attributes missing' | |
1257 | * But... yeah, paranoia | |
1258 | * Take this as a "malformed attribute" | |
1259 | */ | |
1260 | zlog (peer->log, LOG_ERR, | |
1261 | "%s BGP not AS4 capable peer sent AS4_PATH but" | |
1262 | " no AS_PATH, cant do anything here", peer->host); | |
b881c707 PJ |
1263 | return bgp_attr_malformed (peer, BGP_ATTR_AS_PATH, flag, |
1264 | BGP_NOTIFY_UPDATE_MAL_ATTR, | |
1265 | NULL, 0); | |
0b2aa3a0 PJ |
1266 | } |
1267 | ||
1268 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1269 | * because that may override AS4_PATH | |
1270 | */ | |
1271 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) ) | |
1272 | { | |
b881c707 | 1273 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) ) |
0b2aa3a0 | 1274 | { |
370b64a2 PJ |
1275 | assert (attre); |
1276 | ||
0b2aa3a0 PJ |
1277 | /* received both. |
1278 | * if the as_number in aggregator is not AS_TRANS, | |
1279 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1280 | * and the Aggregator shall be taken as | |
1281 | * info on the aggregating node, and the AS_PATH | |
1282 | * shall be taken as the AS_PATH | |
1283 | * otherwise | |
1284 | * the Aggregator shall be ignored and the | |
1285 | * AS4_AGGREGATOR shall be taken as the | |
1286 | * Aggregating node and the AS_PATH is to be | |
1287 | * constructed "as in all other cases" | |
1288 | */ | |
b881c707 | 1289 | if (attre->aggregator_as != BGP_AS_TRANS) |
0b2aa3a0 PJ |
1290 | { |
1291 | /* ignore */ | |
1292 | if ( BGP_DEBUG(as4, AS4)) | |
1293 | zlog_debug ("[AS4] %s BGP not AS4 capable peer" | |
1294 | " send AGGREGATOR != AS_TRANS and" | |
1295 | " AS4_AGGREGATOR, so ignore" | |
1296 | " AS4_AGGREGATOR and AS4_PATH", peer->host); | |
1297 | ignore_as4_path = 1; | |
1298 | } | |
1299 | else | |
1300 | { | |
1301 | /* "New_aggregator shall be taken as aggregator" */ | |
1302 | attre->aggregator_as = as4_aggregator; | |
1303 | attre->aggregator_addr.s_addr = as4_aggregator_addr->s_addr; | |
1304 | } | |
1305 | } | |
1306 | else | |
1307 | { | |
1308 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1309 | * That is bogus - but reading the conditions | |
1310 | * we have to handle AS4_AGGREGATOR as if it were | |
1311 | * AGGREGATOR in that case | |
1312 | */ | |
1313 | if ( BGP_DEBUG(as4, AS4)) | |
1314 | zlog_debug ("[AS4] %s BGP not AS4 capable peer send" | |
1315 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1316 | " it as if AGGREGATOR with AS_TRANS had been there", peer->host); | |
370b64a2 | 1317 | (attre = bgp_attr_extra_get (attr))->aggregator_as = as4_aggregator; |
0b2aa3a0 PJ |
1318 | /* sweep it under the carpet and simulate a "good" AGGREGATOR */ |
1319 | attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)); | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
b881c707 | 1324 | if (!ignore_as4_path && (attr->flag & (ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH)))) |
0b2aa3a0 PJ |
1325 | { |
1326 | newpath = aspath_reconcile_as4 (attr->aspath, as4_path); | |
f6f434b2 | 1327 | aspath_unintern (&attr->aspath); |
0b2aa3a0 PJ |
1328 | attr->aspath = aspath_intern (newpath); |
1329 | } | |
b881c707 | 1330 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1331 | } |
1332 | ||
718e3744 | 1333 | /* Community attribute. */ |
b881c707 | 1334 | static bgp_attr_parse_ret_t |
718e3744 | 1335 | bgp_attr_community (struct peer *peer, bgp_size_t length, |
b881c707 | 1336 | struct attr *attr, u_char flag, u_char *startp) |
718e3744 | 1337 | { |
b881c707 PJ |
1338 | bgp_size_t total |
1339 | = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1340 | ||
718e3744 | 1341 | if (length == 0) |
b2ceea18 PJ |
1342 | { |
1343 | attr->community = NULL; | |
b881c707 | 1344 | return BGP_ATTR_PARSE_PROCEED; |
b2ceea18 | 1345 | } |
0c466381 PJ |
1346 | |
1347 | attr->community = | |
1348 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
1349 | ||
1350 | /* XXX: fix community_parse to use stream API and remove this */ | |
1351 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1352 | |
0c466381 | 1353 | if (!attr->community) |
b881c707 PJ |
1354 | return bgp_attr_malformed (peer, BGP_ATTR_COMMUNITIES, flag, |
1355 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1356 | startp, total); | |
0c466381 | 1357 | |
718e3744 | 1358 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); |
1359 | ||
b881c707 | 1360 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1361 | } |
1362 | ||
1363 | /* Originator ID attribute. */ | |
b881c707 | 1364 | static bgp_attr_parse_ret_t |
718e3744 | 1365 | bgp_attr_originator_id (struct peer *peer, bgp_size_t length, |
1366 | struct attr *attr, u_char flag) | |
1367 | { | |
1368 | if (length != 4) | |
1369 | { | |
1370 | zlog (peer->log, LOG_ERR, "Bad originator ID length %d", length); | |
1371 | ||
b881c707 PJ |
1372 | return bgp_attr_malformed (peer, BGP_ATTR_ORIGINATOR_ID, flag, |
1373 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1374 | NULL, 0); | |
718e3744 | 1375 | } |
1376 | ||
fb982c25 PJ |
1377 | (bgp_attr_extra_get (attr))->originator_id.s_addr |
1378 | = stream_get_ipv4 (peer->ibuf); | |
718e3744 | 1379 | |
1380 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
1381 | ||
b881c707 | 1382 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1383 | } |
1384 | ||
1385 | /* Cluster list attribute. */ | |
b881c707 | 1386 | static bgp_attr_parse_ret_t |
718e3744 | 1387 | bgp_attr_cluster_list (struct peer *peer, bgp_size_t length, |
1388 | struct attr *attr, u_char flag) | |
1389 | { | |
1390 | /* Check length. */ | |
1391 | if (length % 4) | |
1392 | { | |
1393 | zlog (peer->log, LOG_ERR, "Bad cluster list length %d", length); | |
1394 | ||
b881c707 PJ |
1395 | return bgp_attr_malformed (peer, BGP_ATTR_CLUSTER_LIST, flag, |
1396 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1397 | NULL, 0); | |
718e3744 | 1398 | } |
1399 | ||
fb982c25 PJ |
1400 | (bgp_attr_extra_get (attr))->cluster |
1401 | = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length); | |
b881c707 PJ |
1402 | |
1403 | /* XXX: Fix cluster_parse to use stream API and then remove this */ | |
1404 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1405 | |
1406 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
1407 | ||
b881c707 | 1408 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1409 | } |
1410 | ||
1411 | /* Multiprotocol reachability information parse. */ | |
03292809 | 1412 | int |
718e3744 | 1413 | bgp_mp_reach_parse (struct peer *peer, bgp_size_t length, struct attr *attr, |
1414 | struct bgp_nlri *mp_update) | |
1415 | { | |
4c9641ba ML |
1416 | afi_t afi; |
1417 | safi_t safi; | |
718e3744 | 1418 | bgp_size_t nlri_len; |
6e4ab12f | 1419 | size_t start; |
718e3744 | 1420 | int ret; |
1421 | struct stream *s; | |
fb982c25 | 1422 | struct attr_extra *attre = bgp_attr_extra_get(attr); |
718e3744 | 1423 | |
1424 | /* Set end of packet. */ | |
6e4ab12f PJ |
1425 | s = BGP_INPUT(peer); |
1426 | start = stream_get_getp(s); | |
1427 | ||
1428 | /* safe to read statically sized header? */ | |
1429 | #define BGP_MP_REACH_MIN_SIZE 5 | |
03292809 | 1430 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
6e4ab12f | 1431 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) |
03292809 PJ |
1432 | { |
1433 | zlog_info ("%s: %s sent invalid length, %lu", | |
1434 | __func__, peer->host, (unsigned long)length); | |
b881c707 | 1435 | return BGP_ATTR_PARSE_ERROR; |
03292809 | 1436 | } |
6e4ab12f | 1437 | |
718e3744 | 1438 | /* Load AFI, SAFI. */ |
1439 | afi = stream_getw (s); | |
1440 | safi = stream_getc (s); | |
1441 | ||
1442 | /* Get nexthop length. */ | |
fb982c25 | 1443 | attre->mp_nexthop_len = stream_getc (s); |
6e4ab12f | 1444 | |
03292809 PJ |
1445 | if (LEN_LEFT < attre->mp_nexthop_len) |
1446 | { | |
1447 | zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1448 | __func__, peer->host, attre->mp_nexthop_len); | |
b881c707 | 1449 | return BGP_ATTR_PARSE_ERROR; |
03292809 | 1450 | } |
6e4ab12f | 1451 | |
718e3744 | 1452 | /* Nexthop length check. */ |
fb982c25 | 1453 | switch (attre->mp_nexthop_len) |
718e3744 | 1454 | { |
1455 | case 4: | |
fb982c25 | 1456 | stream_get (&attre->mp_nexthop_global_in, s, 4); |
66bed4f4 ML |
1457 | /* Probably needed for RFC 2283 */ |
1458 | if (attr->nexthop.s_addr == 0) | |
1459 | memcpy(&attr->nexthop.s_addr, &attre->mp_nexthop_global_in, 4); | |
718e3744 | 1460 | break; |
1461 | case 12: | |
1462 | { | |
1463 | u_int32_t rd_high; | |
1464 | u_int32_t rd_low; | |
1465 | ||
1466 | rd_high = stream_getl (s); | |
1467 | rd_low = stream_getl (s); | |
fb982c25 | 1468 | stream_get (&attre->mp_nexthop_global_in, s, 4); |
718e3744 | 1469 | } |
1470 | break; | |
1471 | #ifdef HAVE_IPV6 | |
1472 | case 16: | |
fb982c25 | 1473 | stream_get (&attre->mp_nexthop_global, s, 16); |
718e3744 | 1474 | break; |
1475 | case 32: | |
fb982c25 PJ |
1476 | stream_get (&attre->mp_nexthop_global, s, 16); |
1477 | stream_get (&attre->mp_nexthop_local, s, 16); | |
1478 | if (! IN6_IS_ADDR_LINKLOCAL (&attre->mp_nexthop_local)) | |
718e3744 | 1479 | { |
1480 | char buf1[INET6_ADDRSTRLEN]; | |
1481 | char buf2[INET6_ADDRSTRLEN]; | |
1482 | ||
1483 | if (BGP_DEBUG (update, UPDATE_IN)) | |
557865c2 | 1484 | zlog_debug ("%s got two nexthop %s %s but second one is not a link-local nexthop", peer->host, |
fb982c25 | 1485 | inet_ntop (AF_INET6, &attre->mp_nexthop_global, |
718e3744 | 1486 | buf1, INET6_ADDRSTRLEN), |
fb982c25 | 1487 | inet_ntop (AF_INET6, &attre->mp_nexthop_local, |
718e3744 | 1488 | buf2, INET6_ADDRSTRLEN)); |
1489 | ||
fb982c25 | 1490 | attre->mp_nexthop_len = 16; |
718e3744 | 1491 | } |
1492 | break; | |
1493 | #endif /* HAVE_IPV6 */ | |
1494 | default: | |
03292809 PJ |
1495 | zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d", |
1496 | __func__, peer->host, attre->mp_nexthop_len); | |
b881c707 | 1497 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1498 | } |
1499 | ||
03292809 PJ |
1500 | if (!LEN_LEFT) |
1501 | { | |
1502 | zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)", | |
1503 | __func__, peer->host); | |
b881c707 | 1504 | return BGP_ATTR_PARSE_ERROR; |
03292809 | 1505 | } |
718e3744 | 1506 | |
6e4ab12f PJ |
1507 | { |
1508 | u_char val; | |
1509 | if ((val = stream_getc (s))) | |
1510 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
1511 | peer->host, val); | |
1512 | } | |
1513 | ||
1514 | /* must have nrli_len, what is left of the attribute */ | |
03292809 | 1515 | nlri_len = LEN_LEFT; |
6e4ab12f | 1516 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) |
03292809 PJ |
1517 | { |
1518 | zlog_info ("%s: (%s) Failed to read NLRI", | |
1519 | __func__, peer->host); | |
b881c707 | 1520 | return BGP_ATTR_PARSE_ERROR; |
03292809 | 1521 | } |
718e3744 | 1522 | |
42e6d745 | 1523 | if (safi != SAFI_MPLS_LABELED_VPN) |
718e3744 | 1524 | { |
1525 | ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), nlri_len); | |
03292809 PJ |
1526 | if (ret < 0) |
1527 | { | |
1528 | zlog_info ("%s: (%s) NLRI doesn't pass sanity check", | |
1529 | __func__, peer->host); | |
b881c707 | 1530 | return BGP_ATTR_PARSE_ERROR; |
03292809 | 1531 | } |
718e3744 | 1532 | } |
1533 | ||
1534 | mp_update->afi = afi; | |
1535 | mp_update->safi = safi; | |
1536 | mp_update->nlri = stream_pnt (s); | |
1537 | mp_update->length = nlri_len; | |
1538 | ||
9985f83c | 1539 | stream_forward_getp (s, nlri_len); |
718e3744 | 1540 | |
b881c707 | 1541 | return BGP_ATTR_PARSE_PROCEED; |
03292809 | 1542 | #undef LEN_LEFT |
718e3744 | 1543 | } |
1544 | ||
1545 | /* Multiprotocol unreachable parse */ | |
03292809 | 1546 | int |
6e4ab12f | 1547 | bgp_mp_unreach_parse (struct peer *peer, bgp_size_t length, |
718e3744 | 1548 | struct bgp_nlri *mp_withdraw) |
1549 | { | |
1550 | struct stream *s; | |
4c9641ba ML |
1551 | afi_t afi; |
1552 | safi_t safi; | |
718e3744 | 1553 | u_int16_t withdraw_len; |
1554 | int ret; | |
1555 | ||
1556 | s = peer->ibuf; | |
6e4ab12f PJ |
1557 | |
1558 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
1559 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
b881c707 | 1560 | return BGP_ATTR_PARSE_ERROR; |
6e4ab12f | 1561 | |
718e3744 | 1562 | afi = stream_getw (s); |
1563 | safi = stream_getc (s); | |
6e4ab12f PJ |
1564 | |
1565 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; | |
718e3744 | 1566 | |
42e6d745 | 1567 | if (safi != SAFI_MPLS_LABELED_VPN) |
718e3744 | 1568 | { |
1569 | ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), withdraw_len); | |
1570 | if (ret < 0) | |
b881c707 | 1571 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1572 | } |
1573 | ||
1574 | mp_withdraw->afi = afi; | |
1575 | mp_withdraw->safi = safi; | |
1576 | mp_withdraw->nlri = stream_pnt (s); | |
1577 | mp_withdraw->length = withdraw_len; | |
1578 | ||
9985f83c | 1579 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1580 | |
b881c707 | 1581 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1582 | } |
1583 | ||
1584 | /* Extended Community attribute. */ | |
b881c707 | 1585 | static bgp_attr_parse_ret_t |
718e3744 | 1586 | bgp_attr_ext_communities (struct peer *peer, bgp_size_t length, |
b881c707 | 1587 | struct attr *attr, u_char flag, u_char *startp) |
718e3744 | 1588 | { |
b881c707 PJ |
1589 | bgp_size_t total |
1590 | = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1591 | ||
718e3744 | 1592 | if (length == 0) |
fb982c25 PJ |
1593 | { |
1594 | if (attr->extra) | |
1595 | attr->extra->ecommunity = NULL; | |
0c466381 | 1596 | /* Empty extcomm doesn't seem to be invalid per se */ |
b881c707 | 1597 | return BGP_ATTR_PARSE_PROCEED; |
fb982c25 | 1598 | } |
0c466381 PJ |
1599 | |
1600 | (bgp_attr_extra_get (attr))->ecommunity = | |
1601 | ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); | |
1602 | /* XXX: fix ecommunity_parse to use stream API */ | |
1603 | stream_forward_getp (peer->ibuf, length); | |
1604 | ||
1605 | if (!attr->extra->ecommunity) | |
b881c707 PJ |
1606 | return bgp_attr_malformed (peer, BGP_ATTR_EXT_COMMUNITIES, |
1607 | flag, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1608 | startp, total); | |
0c466381 | 1609 | |
718e3744 | 1610 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); |
1611 | ||
b881c707 | 1612 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1613 | } |
1614 | ||
1615 | /* BGP unknown attribute treatment. */ | |
b881c707 | 1616 | static bgp_attr_parse_ret_t |
718e3744 | 1617 | bgp_attr_unknown (struct peer *peer, struct attr *attr, u_char flag, |
1618 | u_char type, bgp_size_t length, u_char *startp) | |
1619 | { | |
1620 | bgp_size_t total; | |
1621 | struct transit *transit; | |
fb982c25 | 1622 | struct attr_extra *attre; |
718e3744 | 1623 | |
f418446b | 1624 | if (BGP_DEBUG (normal, NORMAL)) |
1625 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", | |
1626 | peer->host, type, length); | |
1627 | ||
718e3744 | 1628 | if (BGP_DEBUG (events, EVENTS)) |
557865c2 | 1629 | zlog (peer->log, LOG_DEBUG, |
718e3744 | 1630 | "Unknown attribute type %d length %d is received", type, length); |
1631 | ||
1632 | /* Forward read pointer of input stream. */ | |
9985f83c | 1633 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 1634 | |
1635 | /* Adjest total length to include type and length. */ | |
1636 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1637 | ||
1638 | /* If any of the mandatory well-known attributes are not recognized, | |
1639 | then the Error Subcode is set to Unrecognized Well-known | |
1640 | Attribute. The Data field contains the unrecognized attribute | |
1641 | (type, length and value). */ | |
b881c707 | 1642 | if (!CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) |
718e3744 | 1643 | { |
b881c707 PJ |
1644 | return bgp_attr_malformed (peer, type, flag, |
1645 | BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
1646 | startp, total); | |
718e3744 | 1647 | } |
1648 | ||
1649 | /* Unrecognized non-transitive optional attributes must be quietly | |
1650 | ignored and not passed along to other BGP peers. */ | |
1651 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
b881c707 | 1652 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1653 | |
1654 | /* If a path with recognized transitive optional attribute is | |
1655 | accepted and passed along to other BGP peers and the Partial bit | |
1656 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
1657 | is not set back to 0 by the current AS. */ | |
1658 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
1659 | ||
1660 | /* Store transitive attribute to the end of attr->transit. */ | |
fb982c25 | 1661 | if (! ((attre = bgp_attr_extra_get(attr))->transit) ) |
393deb9b | 1662 | attre->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); |
718e3744 | 1663 | |
fb982c25 | 1664 | transit = attre->transit; |
718e3744 | 1665 | |
1666 | if (transit->val) | |
1667 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
1668 | transit->length + total); | |
1669 | else | |
1670 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
1671 | ||
1672 | memcpy (transit->val + transit->length, startp, total); | |
1673 | transit->length += total; | |
1674 | ||
b881c707 | 1675 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1676 | } |
1677 | ||
1678 | /* Read attribute of update packet. This function is called from | |
1679 | bgp_update() in bgpd.c. */ | |
b881c707 | 1680 | bgp_attr_parse_ret_t |
718e3744 | 1681 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, |
1682 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) | |
1683 | { | |
1684 | int ret; | |
b881c707 | 1685 | u_char flag = 0; |
0b2aa3a0 | 1686 | u_char type = 0; |
718e3744 | 1687 | bgp_size_t length; |
1688 | u_char *startp, *endp; | |
1689 | u_char *attr_endp; | |
1690 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
0b2aa3a0 PJ |
1691 | /* we need the as4_path only until we have synthesized the as_path with it */ |
1692 | /* same goes for as4_aggregator */ | |
1693 | struct aspath *as4_path = NULL; | |
1694 | as_t as4_aggregator = 0; | |
1695 | struct in_addr as4_aggregator_addr = { 0 }; | |
718e3744 | 1696 | |
1697 | /* Initialize bitmap. */ | |
1698 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
1699 | ||
1700 | /* End pointer of BGP attribute. */ | |
1701 | endp = BGP_INPUT_PNT (peer) + size; | |
b881c707 | 1702 | |
718e3744 | 1703 | /* Get attributes to the end of attribute length. */ |
1704 | while (BGP_INPUT_PNT (peer) < endp) | |
1705 | { | |
1706 | /* Check remaining length check.*/ | |
1707 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
1708 | { | |
c29fdba7 | 1709 | /* XXX warning: long int format, int arg (arg 5) */ |
718e3744 | 1710 | zlog (peer->log, LOG_WARNING, |
d68ab100 | 1711 | "%s: error BGP attribute length %lu is smaller than min len", |
0b2aa3a0 PJ |
1712 | peer->host, |
1713 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
718e3744 | 1714 | |
1715 | bgp_notify_send (peer, | |
1716 | BGP_NOTIFY_UPDATE_ERR, | |
1717 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 1718 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1719 | } |
1720 | ||
1721 | /* Fetch attribute flag and type. */ | |
1722 | startp = BGP_INPUT_PNT (peer); | |
1723 | flag = stream_getc (BGP_INPUT (peer)); | |
1724 | type = stream_getc (BGP_INPUT (peer)); | |
1725 | ||
370b64a2 PJ |
1726 | /* Check whether Extended-Length applies and is in bounds */ |
1727 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) | |
1728 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) | |
1729 | { | |
1730 | zlog (peer->log, LOG_WARNING, | |
d68ab100 | 1731 | "%s: Extended length set, but just %lu bytes of attr header", |
370b64a2 PJ |
1732 | peer->host, |
1733 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
1734 | ||
1735 | bgp_notify_send (peer, | |
1736 | BGP_NOTIFY_UPDATE_ERR, | |
1737 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 1738 | return BGP_ATTR_PARSE_ERROR; |
370b64a2 PJ |
1739 | } |
1740 | ||
718e3744 | 1741 | /* Check extended attribue length bit. */ |
1742 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
1743 | length = stream_getw (BGP_INPUT (peer)); | |
1744 | else | |
1745 | length = stream_getc (BGP_INPUT (peer)); | |
1746 | ||
1747 | /* If any attribute appears more than once in the UPDATE | |
1748 | message, then the Error Subcode is set to Malformed Attribute | |
1749 | List. */ | |
1750 | ||
1751 | if (CHECK_BITMAP (seen, type)) | |
1752 | { | |
1753 | zlog (peer->log, LOG_WARNING, | |
d68ab100 | 1754 | "%s: error BGP attribute type %d appears twice in a message", |
718e3744 | 1755 | peer->host, type); |
1756 | ||
1757 | bgp_notify_send (peer, | |
1758 | BGP_NOTIFY_UPDATE_ERR, | |
1759 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 | 1760 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1761 | } |
1762 | ||
1763 | /* Set type to bitmap to check duplicate attribute. `type' is | |
1764 | unsigned char so it never overflow bitmap range. */ | |
1765 | ||
1766 | SET_BITMAP (seen, type); | |
1767 | ||
1768 | /* Overflow check. */ | |
1769 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
1770 | ||
1771 | if (attr_endp > endp) | |
1772 | { | |
1773 | zlog (peer->log, LOG_WARNING, | |
d68ab100 | 1774 | "%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); |
718e3744 | 1775 | bgp_notify_send (peer, |
1776 | BGP_NOTIFY_UPDATE_ERR, | |
1777 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 1778 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1779 | } |
1780 | ||
1781 | /* OK check attribute and store it's value. */ | |
1782 | switch (type) | |
1783 | { | |
1784 | case BGP_ATTR_ORIGIN: | |
1785 | ret = bgp_attr_origin (peer, length, attr, flag, startp); | |
1786 | break; | |
1787 | case BGP_ATTR_AS_PATH: | |
ab005298 | 1788 | ret = bgp_attr_aspath (peer, length, attr, flag, startp); |
718e3744 | 1789 | break; |
0b2aa3a0 | 1790 | case BGP_ATTR_AS4_PATH: |
b881c707 | 1791 | ret = bgp_attr_as4_path (peer, length, attr, flag, startp, &as4_path); |
0b2aa3a0 | 1792 | break; |
718e3744 | 1793 | case BGP_ATTR_NEXT_HOP: |
1794 | ret = bgp_attr_nexthop (peer, length, attr, flag, startp); | |
1795 | break; | |
1796 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1797 | ret = bgp_attr_med (peer, length, attr, flag, startp); | |
1798 | break; | |
1799 | case BGP_ATTR_LOCAL_PREF: | |
0ea968d2 | 1800 | ret = bgp_attr_local_pref (peer, length, attr, flag, startp); |
718e3744 | 1801 | break; |
1802 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
9eba2ada | 1803 | ret = bgp_attr_atomic (peer, length, attr, flag, startp); |
718e3744 | 1804 | break; |
1805 | case BGP_ATTR_AGGREGATOR: | |
1806 | ret = bgp_attr_aggregator (peer, length, attr, flag); | |
1807 | break; | |
0b2aa3a0 | 1808 | case BGP_ATTR_AS4_AGGREGATOR: |
b881c707 PJ |
1809 | ret = bgp_attr_as4_aggregator (peer, length, attr, flag, |
1810 | &as4_aggregator, | |
1811 | &as4_aggregator_addr); | |
0b2aa3a0 | 1812 | break; |
718e3744 | 1813 | case BGP_ATTR_COMMUNITIES: |
b881c707 | 1814 | ret = bgp_attr_community (peer, length, attr, flag, startp); |
718e3744 | 1815 | break; |
1816 | case BGP_ATTR_ORIGINATOR_ID: | |
1817 | ret = bgp_attr_originator_id (peer, length, attr, flag); | |
1818 | break; | |
1819 | case BGP_ATTR_CLUSTER_LIST: | |
1820 | ret = bgp_attr_cluster_list (peer, length, attr, flag); | |
1821 | break; | |
1822 | case BGP_ATTR_MP_REACH_NLRI: | |
1823 | ret = bgp_mp_reach_parse (peer, length, attr, mp_update); | |
1824 | break; | |
1825 | case BGP_ATTR_MP_UNREACH_NLRI: | |
1826 | ret = bgp_mp_unreach_parse (peer, length, mp_withdraw); | |
1827 | break; | |
1828 | case BGP_ATTR_EXT_COMMUNITIES: | |
b881c707 | 1829 | ret = bgp_attr_ext_communities (peer, length, attr, flag, startp); |
718e3744 | 1830 | break; |
1831 | default: | |
1832 | ret = bgp_attr_unknown (peer, attr, flag, type, length, startp); | |
1833 | break; | |
1834 | } | |
b881c707 PJ |
1835 | |
1836 | /* If hard error occured immediately return to the caller. */ | |
1837 | if (ret == BGP_ATTR_PARSE_ERROR) | |
6e4ab12f PJ |
1838 | { |
1839 | zlog (peer->log, LOG_WARNING, | |
1840 | "%s: Attribute %s, parse error", | |
1841 | peer->host, | |
1842 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
1843 | bgp_notify_send (peer, |
1844 | BGP_NOTIFY_UPDATE_ERR, | |
1845 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
1846 | if (as4_path) | |
1847 | aspath_unintern (&as4_path); | |
1848 | return ret; | |
6e4ab12f | 1849 | } |
b881c707 PJ |
1850 | if (ret == BGP_ATTR_PARSE_WITHDRAW) |
1851 | { | |
1852 | ||
1853 | zlog (peer->log, LOG_WARNING, | |
1854 | "%s: Attribute %s, parse error - treating as withdrawal", | |
1855 | peer->host, | |
1856 | LOOKUP (attr_str, type)); | |
1857 | if (as4_path) | |
1858 | aspath_unintern (&as4_path); | |
1859 | return ret; | |
1860 | } | |
1861 | ||
718e3744 | 1862 | /* Check the fetched length. */ |
1863 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
1864 | { | |
1865 | zlog (peer->log, LOG_WARNING, | |
6e4ab12f PJ |
1866 | "%s: BGP attribute %s, fetch error", |
1867 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 1868 | bgp_notify_send (peer, |
1869 | BGP_NOTIFY_UPDATE_ERR, | |
1870 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
1871 | if (as4_path) |
1872 | aspath_unintern (&as4_path); | |
1873 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 1874 | } |
1875 | } | |
1876 | ||
1877 | /* Check final read pointer is same as end pointer. */ | |
1878 | if (BGP_INPUT_PNT (peer) != endp) | |
1879 | { | |
1880 | zlog (peer->log, LOG_WARNING, | |
d68ab100 | 1881 | "%s: BGP attribute %s, length mismatch", |
6e4ab12f | 1882 | peer->host, LOOKUP (attr_str, type)); |
718e3744 | 1883 | bgp_notify_send (peer, |
1884 | BGP_NOTIFY_UPDATE_ERR, | |
1885 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
1886 | if (as4_path) |
1887 | aspath_unintern (&as4_path); | |
1888 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 1889 | } |
1890 | ||
0b2aa3a0 PJ |
1891 | /* |
1892 | * At this place we can see whether we got AS4_PATH and/or | |
1893 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
1894 | * We can not do this before we've read all attributes because | |
1895 | * the as4 handling does not say whether AS4_PATH has to be sent | |
1896 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
1897 | * in relationship to AGGREGATOR. | |
1898 | * So, to be defensive, we are not relying on any order and read | |
1899 | * all attributes first, including these 32bit ones, and now, | |
1900 | * afterwards, we look what and if something is to be done for as4. | |
1901 | */ | |
b881c707 | 1902 | if (bgp_attr_munge_as4_attrs (peer, attr, flag, as4_path, |
0b2aa3a0 | 1903 | as4_aggregator, &as4_aggregator_addr)) |
b881c707 PJ |
1904 | { |
1905 | if (as4_path) | |
1906 | aspath_unintern (&as4_path); | |
1907 | return BGP_ATTR_PARSE_ERROR; | |
1908 | } | |
0b2aa3a0 PJ |
1909 | |
1910 | /* At this stage, we have done all fiddling with as4, and the | |
1911 | * resulting info is in attr->aggregator resp. attr->aspath | |
1912 | * so we can chuck as4_aggregator and as4_path alltogether in | |
1913 | * order to save memory | |
1914 | */ | |
b881c707 | 1915 | if (as4_path) |
0b2aa3a0 | 1916 | { |
f6f434b2 | 1917 | aspath_unintern (&as4_path); /* unintern - it is in the hash */ |
0b2aa3a0 PJ |
1918 | /* The flag that we got this is still there, but that does not |
1919 | * do any trouble | |
1920 | */ | |
1921 | } | |
1922 | /* | |
1923 | * The "rest" of the code does nothing with as4_aggregator. | |
1924 | * there is no memory attached specifically which is not part | |
1925 | * of the attr. | |
1926 | * so ignoring just means do nothing. | |
1927 | */ | |
1928 | /* | |
1929 | * Finally do the checks on the aspath we did not do yet | |
1930 | * because we waited for a potentially synthesized aspath. | |
1931 | */ | |
b881c707 | 1932 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) |
0b2aa3a0 | 1933 | { |
b881c707 PJ |
1934 | ret = bgp_attr_aspath_check (peer, attr, flag); |
1935 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
0b2aa3a0 PJ |
1936 | return ret; |
1937 | } | |
1938 | ||
718e3744 | 1939 | /* Finally intern unknown attribute. */ |
fb982c25 PJ |
1940 | if (attr->extra && attr->extra->transit) |
1941 | attr->extra->transit = transit_intern (attr->extra->transit); | |
718e3744 | 1942 | |
b881c707 | 1943 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1944 | } |
1945 | ||
1946 | /* Well-known attribute check. */ | |
1947 | int | |
1948 | bgp_attr_check (struct peer *peer, struct attr *attr) | |
1949 | { | |
1950 | u_char type = 0; | |
1951 | ||
1952 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) | |
1953 | type = BGP_ATTR_ORIGIN; | |
1954 | ||
1955 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
1956 | type = BGP_ATTR_AS_PATH; | |
1957 | ||
1958 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP))) | |
1959 | type = BGP_ATTR_NEXT_HOP; | |
1960 | ||
1961 | if (peer_sort (peer) == BGP_PEER_IBGP | |
1962 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) | |
1963 | type = BGP_ATTR_LOCAL_PREF; | |
1964 | ||
1965 | if (type) | |
1966 | { | |
1967 | zlog (peer->log, LOG_WARNING, | |
1968 | "%s Missing well-known attribute %d.", | |
1969 | peer->host, type); | |
1970 | bgp_notify_send_with_data (peer, | |
1971 | BGP_NOTIFY_UPDATE_ERR, | |
1972 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
1973 | &type, 1); | |
b881c707 | 1974 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 1975 | } |
b881c707 | 1976 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1977 | } |
1978 | \f | |
1979 | int stream_put_prefix (struct stream *, struct prefix *); | |
1980 | ||
1981 | /* Make attribute packet. */ | |
1982 | bgp_size_t | |
1983 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
1984 | struct stream *s, struct attr *attr, struct prefix *p, | |
1985 | afi_t afi, safi_t safi, struct peer *from, | |
a3b6ea56 | 1986 | struct prefix_rd *prd, u_char *tag) |
718e3744 | 1987 | { |
fe69a505 | 1988 | size_t cp; |
0b2aa3a0 | 1989 | size_t aspath_sizep; |
718e3744 | 1990 | struct aspath *aspath; |
0b2aa3a0 PJ |
1991 | int send_as4_path = 0; |
1992 | int send_as4_aggregator = 0; | |
1993 | int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
718e3744 | 1994 | |
1995 | if (! bgp) | |
1996 | bgp = bgp_get_default (); | |
1997 | ||
1998 | /* Remember current pointer. */ | |
9985f83c | 1999 | cp = stream_get_endp (s); |
718e3744 | 2000 | |
2001 | /* Origin attribute. */ | |
2002 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2003 | stream_putc (s, BGP_ATTR_ORIGIN); | |
2004 | stream_putc (s, 1); | |
2005 | stream_putc (s, attr->origin); | |
2006 | ||
2007 | /* AS path attribute. */ | |
2008 | ||
2009 | /* If remote-peer is EBGP */ | |
2010 | if (peer_sort (peer) == BGP_PEER_EBGP | |
2011 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) | |
fe69a505 | 2012 | || attr->aspath->segments == NULL) |
fee0f4c6 | 2013 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 2014 | { |
2015 | aspath = aspath_dup (attr->aspath); | |
2016 | ||
2017 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
2018 | { | |
2019 | /* Strip the confed info, and then stuff our path CONFED_ID | |
2020 | on the front */ | |
2021 | aspath = aspath_delete_confed_seq (aspath); | |
2022 | aspath = aspath_add_seq (aspath, bgp->confed_id); | |
2023 | } | |
2024 | else | |
2025 | { | |
2026 | aspath = aspath_add_seq (aspath, peer->local_as); | |
2027 | if (peer->change_local_as) | |
2028 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
2029 | } | |
2030 | } | |
2031 | else if (peer_sort (peer) == BGP_PEER_CONFED) | |
2032 | { | |
2033 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
2034 | aspath = aspath_dup (attr->aspath); | |
2035 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
2036 | } | |
2037 | else | |
2038 | aspath = attr->aspath; | |
2039 | ||
0b2aa3a0 PJ |
2040 | /* If peer is not AS4 capable, then: |
2041 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
2042 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment | |
2043 | * types are in it (i.e. exclude them if they are there) | |
2044 | * AND do this only if there is at least one asnum > 65535 in the path! | |
2045 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change | |
2046 | * all ASnums > 65535 to BGP_AS_TRANS | |
2047 | */ | |
2048 | ||
2049 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2050 | stream_putc (s, BGP_ATTR_AS_PATH); | |
2051 | aspath_sizep = stream_get_endp (s); | |
2052 | stream_putw (s, 0); | |
2053 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit)); | |
2054 | ||
2055 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
2056 | * in the path | |
2057 | */ | |
2058 | if (!use32bit && aspath_has_as4 (aspath)) | |
2059 | send_as4_path = 1; /* we'll do this later, at the correct place */ | |
2060 | ||
718e3744 | 2061 | /* Nexthop attribute. */ |
2062 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP) && afi == AFI_IP) | |
2063 | { | |
2064 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2065 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2066 | stream_putc (s, 4); | |
2067 | if (safi == SAFI_MPLS_VPN) | |
2068 | { | |
2069 | if (attr->nexthop.s_addr == 0) | |
2070 | stream_put_ipv4 (s, peer->nexthop.v4.s_addr); | |
2071 | else | |
2072 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2073 | } | |
2074 | else | |
2075 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2076 | } | |
2077 | ||
2078 | /* MED attribute. */ | |
2079 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
2080 | { | |
2081 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2082 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
2083 | stream_putc (s, 4); | |
2084 | stream_putl (s, attr->med); | |
2085 | } | |
2086 | ||
2087 | /* Local preference. */ | |
2088 | if (peer_sort (peer) == BGP_PEER_IBGP || | |
2089 | peer_sort (peer) == BGP_PEER_CONFED) | |
2090 | { | |
2091 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2092 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
2093 | stream_putc (s, 4); | |
2094 | stream_putl (s, attr->local_pref); | |
2095 | } | |
2096 | ||
2097 | /* Atomic aggregate. */ | |
2098 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
2099 | { | |
2100 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2101 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
2102 | stream_putc (s, 0); | |
2103 | } | |
2104 | ||
2105 | /* Aggregator. */ | |
2106 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
2107 | { | |
fb982c25 | 2108 | assert (attr->extra); |
0b2aa3a0 PJ |
2109 | |
2110 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
718e3744 | 2111 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
2112 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
2113 | |
2114 | if (use32bit) | |
2115 | { | |
2116 | /* AS4 capable peer */ | |
2117 | stream_putc (s, 8); | |
2118 | stream_putl (s, attr->extra->aggregator_as); | |
2119 | } | |
2120 | else | |
2121 | { | |
2122 | /* 2-byte AS peer */ | |
2123 | stream_putc (s, 6); | |
2124 | ||
2125 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */ | |
2126 | if ( attr->extra->aggregator_as > 65535 ) | |
2127 | { | |
2128 | stream_putw (s, BGP_AS_TRANS); | |
2129 | ||
2130 | /* we have to send AS4_AGGREGATOR, too. | |
2131 | * we'll do that later in order to send attributes in ascending | |
2132 | * order. | |
2133 | */ | |
2134 | send_as4_aggregator = 1; | |
2135 | } | |
2136 | else | |
2137 | stream_putw (s, (u_int16_t) attr->extra->aggregator_as); | |
2138 | } | |
fb982c25 | 2139 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 2140 | } |
2141 | ||
2142 | /* Community attribute. */ | |
2143 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
2144 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
2145 | { | |
2146 | if (attr->community->size * 4 > 255) | |
2147 | { | |
2148 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2149 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2150 | stream_putw (s, attr->community->size * 4); | |
2151 | } | |
2152 | else | |
2153 | { | |
2154 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2155 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2156 | stream_putc (s, attr->community->size * 4); | |
2157 | } | |
2158 | stream_put (s, attr->community->val, attr->community->size * 4); | |
2159 | } | |
2160 | ||
2161 | /* Route Reflector. */ | |
2162 | if (peer_sort (peer) == BGP_PEER_IBGP | |
2163 | && from | |
2164 | && peer_sort (from) == BGP_PEER_IBGP) | |
2165 | { | |
2166 | /* Originator ID. */ | |
2167 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2168 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
2169 | stream_putc (s, 4); | |
2170 | ||
2171 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
fb982c25 | 2172 | stream_put_in_addr (s, &attr->extra->originator_id); |
34c3f81b PJ |
2173 | else |
2174 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 2175 | |
2176 | /* Cluster list. */ | |
2177 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2178 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
2179 | ||
9eda90ce | 2180 | if (attr->extra && attr->extra->cluster) |
718e3744 | 2181 | { |
fb982c25 | 2182 | stream_putc (s, attr->extra->cluster->length + 4); |
718e3744 | 2183 | /* If this peer configuration's parent BGP has cluster_id. */ |
2184 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
2185 | stream_put_in_addr (s, &bgp->cluster_id); | |
2186 | else | |
2187 | stream_put_in_addr (s, &bgp->router_id); | |
fb982c25 PJ |
2188 | stream_put (s, attr->extra->cluster->list, |
2189 | attr->extra->cluster->length); | |
718e3744 | 2190 | } |
2191 | else | |
2192 | { | |
2193 | stream_putc (s, 4); | |
2194 | /* If this peer configuration's parent BGP has cluster_id. */ | |
2195 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
2196 | stream_put_in_addr (s, &bgp->cluster_id); | |
2197 | else | |
2198 | stream_put_in_addr (s, &bgp->router_id); | |
2199 | } | |
2200 | } | |
2201 | ||
2202 | #ifdef HAVE_IPV6 | |
2203 | /* If p is IPv6 address put it into attribute. */ | |
2204 | if (p->family == AF_INET6) | |
2205 | { | |
2206 | unsigned long sizep; | |
fb982c25 PJ |
2207 | struct attr_extra *attre = attr->extra; |
2208 | ||
2209 | assert (attr->extra); | |
2210 | ||
718e3744 | 2211 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); |
2212 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2213 | sizep = stream_get_endp (s); |
fb982c25 | 2214 | stream_putc (s, 0); /* Marker: Attribute length. */ |
718e3744 | 2215 | stream_putw (s, AFI_IP6); /* AFI */ |
2216 | stream_putc (s, safi); /* SAFI */ | |
2217 | ||
fb982c25 | 2218 | stream_putc (s, attre->mp_nexthop_len); |
718e3744 | 2219 | |
fb982c25 PJ |
2220 | if (attre->mp_nexthop_len == 16) |
2221 | stream_put (s, &attre->mp_nexthop_global, 16); | |
2222 | else if (attre->mp_nexthop_len == 32) | |
718e3744 | 2223 | { |
fb982c25 PJ |
2224 | stream_put (s, &attre->mp_nexthop_global, 16); |
2225 | stream_put (s, &attre->mp_nexthop_local, 16); | |
718e3744 | 2226 | } |
2227 | ||
2228 | /* SNPA */ | |
2229 | stream_putc (s, 0); | |
2230 | ||
718e3744 | 2231 | /* Prefix write. */ |
2232 | stream_put_prefix (s, p); | |
2233 | ||
2234 | /* Set MP attribute length. */ | |
9985f83c | 2235 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 2236 | } |
2237 | #endif /* HAVE_IPV6 */ | |
2238 | ||
2239 | if (p->family == AF_INET && safi == SAFI_MULTICAST) | |
2240 | { | |
2241 | unsigned long sizep; | |
718e3744 | 2242 | |
2243 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2244 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2245 | sizep = stream_get_endp (s); |
fb982c25 | 2246 | stream_putc (s, 0); /* Marker: Attribute Length. */ |
718e3744 | 2247 | stream_putw (s, AFI_IP); /* AFI */ |
2248 | stream_putc (s, SAFI_MULTICAST); /* SAFI */ | |
2249 | ||
2250 | stream_putc (s, 4); | |
2251 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2252 | ||
2253 | /* SNPA */ | |
2254 | stream_putc (s, 0); | |
2255 | ||
718e3744 | 2256 | /* Prefix write. */ |
2257 | stream_put_prefix (s, p); | |
2258 | ||
2259 | /* Set MP attribute length. */ | |
9985f83c | 2260 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 2261 | } |
2262 | ||
2263 | if (p->family == AF_INET && safi == SAFI_MPLS_VPN) | |
2264 | { | |
2265 | unsigned long sizep; | |
718e3744 | 2266 | |
2267 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2268 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2269 | sizep = stream_get_endp (s); |
718e3744 | 2270 | stream_putc (s, 0); /* Length of this attribute. */ |
2271 | stream_putw (s, AFI_IP); /* AFI */ | |
42e6d745 | 2272 | stream_putc (s, SAFI_MPLS_LABELED_VPN); /* SAFI */ |
718e3744 | 2273 | |
2274 | stream_putc (s, 12); | |
2275 | stream_putl (s, 0); | |
2276 | stream_putl (s, 0); | |
fb982c25 | 2277 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); |
718e3744 | 2278 | |
2279 | /* SNPA */ | |
2280 | stream_putc (s, 0); | |
2281 | ||
718e3744 | 2282 | /* Tag, RD, Prefix write. */ |
2283 | stream_putc (s, p->prefixlen + 88); | |
2284 | stream_put (s, tag, 3); | |
2285 | stream_put (s, prd->val, 8); | |
2286 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2287 | ||
2288 | /* Set MP attribute length. */ | |
9985f83c | 2289 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
718e3744 | 2290 | } |
2291 | ||
2292 | /* Extended Communities attribute. */ | |
2293 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
2294 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
2295 | { | |
fb982c25 PJ |
2296 | struct attr_extra *attre = attr->extra; |
2297 | ||
2298 | assert (attre); | |
2299 | ||
2300 | if (peer_sort (peer) == BGP_PEER_IBGP | |
2301 | || peer_sort (peer) == BGP_PEER_CONFED) | |
718e3744 | 2302 | { |
fb982c25 | 2303 | if (attre->ecommunity->size * 8 > 255) |
4372df71 | 2304 | { |
2305 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2306 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 2307 | stream_putw (s, attre->ecommunity->size * 8); |
4372df71 | 2308 | } |
2309 | else | |
2310 | { | |
2311 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2312 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 2313 | stream_putc (s, attre->ecommunity->size * 8); |
4372df71 | 2314 | } |
fb982c25 | 2315 | stream_put (s, attre->ecommunity->val, attre->ecommunity->size * 8); |
718e3744 | 2316 | } |
2317 | else | |
2318 | { | |
5228ad27 | 2319 | u_int8_t *pnt; |
4372df71 | 2320 | int tbit; |
2321 | int ecom_tr_size = 0; | |
2322 | int i; | |
2323 | ||
fb982c25 | 2324 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 2325 | { |
fb982c25 | 2326 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 2327 | tbit = *pnt; |
2328 | ||
2329 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
2330 | continue; | |
2331 | ||
2332 | ecom_tr_size++; | |
2333 | } | |
2334 | ||
2335 | if (ecom_tr_size) | |
2336 | { | |
2337 | if (ecom_tr_size * 8 > 255) | |
2338 | { | |
2339 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2340 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
2341 | stream_putw (s, ecom_tr_size * 8); | |
2342 | } | |
2343 | else | |
2344 | { | |
2345 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2346 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
2347 | stream_putc (s, ecom_tr_size * 8); | |
2348 | } | |
2349 | ||
fb982c25 | 2350 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 2351 | { |
fb982c25 | 2352 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 2353 | tbit = *pnt; |
2354 | ||
2355 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
2356 | continue; | |
2357 | ||
2358 | stream_put (s, pnt, 8); | |
2359 | } | |
2360 | } | |
718e3744 | 2361 | } |
718e3744 | 2362 | } |
0b2aa3a0 PJ |
2363 | |
2364 | if ( send_as4_path ) | |
2365 | { | |
2366 | /* If the peer is NOT As4 capable, AND */ | |
2367 | /* there are ASnums > 65535 in path THEN | |
2368 | * give out AS4_PATH */ | |
2369 | ||
2370 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
2371 | * path segments! | |
2372 | * Hm, I wonder... confederation things *should* only be at | |
2373 | * the beginning of an aspath, right? Then we should use | |
2374 | * aspath_delete_confed_seq for this, because it is already | |
2375 | * there! (JK) | |
2376 | * Folks, talk to me: what is reasonable here!? | |
2377 | */ | |
2378 | aspath = aspath_delete_confed_seq (aspath); | |
2379 | ||
2380 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2381 | stream_putc (s, BGP_ATTR_AS4_PATH); | |
2382 | aspath_sizep = stream_get_endp (s); | |
2383 | stream_putw (s, 0); | |
2384 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1)); | |
2385 | } | |
2386 | ||
2387 | if (aspath != attr->aspath) | |
2388 | aspath_free (aspath); | |
2389 | ||
2390 | if ( send_as4_aggregator ) | |
2391 | { | |
2392 | assert (attr->extra); | |
2393 | ||
2394 | /* send AS4_AGGREGATOR, at this place */ | |
2395 | /* this section of code moved here in order to ensure the correct | |
2396 | * *ascending* order of attributes | |
2397 | */ | |
2398 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2399 | stream_putc (s, BGP_ATTR_AS4_AGGREGATOR); | |
2400 | stream_putc (s, 8); | |
2401 | stream_putl (s, attr->extra->aggregator_as); | |
2402 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); | |
2403 | } | |
41367172 | 2404 | |
718e3744 | 2405 | /* Unknown transit attribute. */ |
fb982c25 PJ |
2406 | if (attr->extra && attr->extra->transit) |
2407 | stream_put (s, attr->extra->transit->val, attr->extra->transit->length); | |
718e3744 | 2408 | |
2409 | /* Return total size of attribute. */ | |
9985f83c | 2410 | return stream_get_endp (s) - cp; |
718e3744 | 2411 | } |
2412 | ||
2413 | bgp_size_t | |
2414 | bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p, | |
2415 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
a3b6ea56 | 2416 | u_char *tag) |
718e3744 | 2417 | { |
2418 | unsigned long cp; | |
2419 | unsigned long attrlen_pnt; | |
2420 | bgp_size_t size; | |
2421 | ||
9985f83c | 2422 | cp = stream_get_endp (s); |
718e3744 | 2423 | |
2424 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2425 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); | |
2426 | ||
9985f83c | 2427 | attrlen_pnt = stream_get_endp (s); |
718e3744 | 2428 | stream_putc (s, 0); /* Length of this attribute. */ |
2429 | ||
2430 | stream_putw (s, family2afi (p->family)); | |
2431 | ||
2432 | if (safi == SAFI_MPLS_VPN) | |
2433 | { | |
2434 | /* SAFI */ | |
42e6d745 | 2435 | stream_putc (s, SAFI_MPLS_LABELED_VPN); |
718e3744 | 2436 | |
2437 | /* prefix. */ | |
2438 | stream_putc (s, p->prefixlen + 88); | |
2439 | stream_put (s, tag, 3); | |
2440 | stream_put (s, prd->val, 8); | |
2441 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2442 | } | |
2443 | else | |
2444 | { | |
2445 | /* SAFI */ | |
2446 | stream_putc (s, safi); | |
2447 | ||
2448 | /* prefix */ | |
2449 | stream_put_prefix (s, p); | |
2450 | } | |
2451 | ||
2452 | /* Set MP attribute length. */ | |
9985f83c | 2453 | size = stream_get_endp (s) - attrlen_pnt - 1; |
718e3744 | 2454 | stream_putc_at (s, attrlen_pnt, size); |
2455 | ||
9985f83c | 2456 | return stream_get_endp (s) - cp; |
718e3744 | 2457 | } |
2458 | ||
2459 | /* Initialization of attribute. */ | |
2460 | void | |
fe69a505 | 2461 | bgp_attr_init (void) |
718e3744 | 2462 | { |
718e3744 | 2463 | aspath_init (); |
2464 | attrhash_init (); | |
2465 | community_init (); | |
2466 | ecommunity_init (); | |
2467 | cluster_init (); | |
2468 | transit_init (); | |
2469 | } | |
2470 | ||
228da428 CC |
2471 | void |
2472 | bgp_attr_finish (void) | |
2473 | { | |
2474 | aspath_finish (); | |
2475 | attrhash_finish (); | |
2476 | community_finish (); | |
2477 | ecommunity_finish (); | |
2478 | cluster_finish (); | |
2479 | transit_finish (); | |
2480 | } | |
2481 | ||
718e3744 | 2482 | /* Make attribute packet. */ |
2483 | void | |
a384592f | 2484 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
2485 | struct prefix *prefix) | |
718e3744 | 2486 | { |
2487 | unsigned long cp; | |
2488 | unsigned long len; | |
0b2aa3a0 | 2489 | size_t aspath_lenp; |
718e3744 | 2490 | struct aspath *aspath; |
2491 | ||
2492 | /* Remember current pointer. */ | |
9985f83c | 2493 | cp = stream_get_endp (s); |
718e3744 | 2494 | |
2495 | /* Place holder of length. */ | |
2496 | stream_putw (s, 0); | |
2497 | ||
2498 | /* Origin attribute. */ | |
2499 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2500 | stream_putc (s, BGP_ATTR_ORIGIN); | |
2501 | stream_putc (s, 1); | |
2502 | stream_putc (s, attr->origin); | |
2503 | ||
2504 | aspath = attr->aspath; | |
0b2aa3a0 PJ |
2505 | |
2506 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2507 | stream_putc (s, BGP_ATTR_AS_PATH); | |
2508 | aspath_lenp = stream_get_endp (s); | |
2509 | stream_putw (s, 0); | |
2510 | ||
2511 | stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1)); | |
718e3744 | 2512 | |
2513 | /* Nexthop attribute. */ | |
a384592f | 2514 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
2515 | if(prefix != NULL | |
2516 | #ifdef HAVE_IPV6 | |
2517 | && prefix->family != AF_INET6 | |
2518 | #endif /* HAVE_IPV6 */ | |
2519 | ) | |
2520 | { | |
2521 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2522 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2523 | stream_putc (s, 4); | |
2524 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2525 | } | |
718e3744 | 2526 | |
2527 | /* MED attribute. */ | |
2528 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
2529 | { | |
2530 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
2531 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
2532 | stream_putc (s, 4); | |
2533 | stream_putl (s, attr->med); | |
2534 | } | |
2535 | ||
2536 | /* Local preference. */ | |
2537 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
2538 | { | |
2539 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2540 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
2541 | stream_putc (s, 4); | |
2542 | stream_putl (s, attr->local_pref); | |
2543 | } | |
2544 | ||
2545 | /* Atomic aggregate. */ | |
2546 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
2547 | { | |
2548 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2549 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
2550 | stream_putc (s, 0); | |
2551 | } | |
2552 | ||
2553 | /* Aggregator. */ | |
2554 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
2555 | { | |
fb982c25 | 2556 | assert (attr->extra); |
718e3744 | 2557 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
2558 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
2559 | stream_putc (s, 8); |
2560 | stream_putl (s, attr->extra->aggregator_as); | |
fb982c25 | 2561 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 2562 | } |
2563 | ||
2564 | /* Community attribute. */ | |
2565 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
2566 | { | |
2567 | if (attr->community->size * 4 > 255) | |
2568 | { | |
2569 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2570 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2571 | stream_putw (s, attr->community->size * 4); | |
2572 | } | |
2573 | else | |
2574 | { | |
2575 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
2576 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
2577 | stream_putc (s, attr->community->size * 4); | |
2578 | } | |
2579 | stream_put (s, attr->community->val, attr->community->size * 4); | |
2580 | } | |
2581 | ||
a384592f | 2582 | #ifdef HAVE_IPV6 |
2583 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
fb982c25 PJ |
2584 | if (prefix != NULL && prefix->family == AF_INET6 && attr->extra && |
2585 | (attr->extra->mp_nexthop_len == 16 || attr->extra->mp_nexthop_len == 32) ) | |
a384592f | 2586 | { |
2587 | int sizep; | |
fb982c25 PJ |
2588 | struct attr_extra *attre = attr->extra; |
2589 | ||
a384592f | 2590 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); |
2591 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 2592 | sizep = stream_get_endp (s); |
a384592f | 2593 | |
2594 | /* MP header */ | |
fb982c25 | 2595 | stream_putc (s, 0); /* Marker: Attribute length. */ |
a384592f | 2596 | stream_putw(s, AFI_IP6); /* AFI */ |
2597 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
2598 | ||
2599 | /* Next hop */ | |
fb982c25 PJ |
2600 | stream_putc(s, attre->mp_nexthop_len); |
2601 | stream_put(s, &attre->mp_nexthop_global, 16); | |
2602 | if (attre->mp_nexthop_len == 32) | |
2603 | stream_put(s, &attre->mp_nexthop_local, 16); | |
a384592f | 2604 | |
2605 | /* SNPA */ | |
2606 | stream_putc(s, 0); | |
2607 | ||
2608 | /* Prefix */ | |
2609 | stream_put_prefix(s, prefix); | |
2610 | ||
2611 | /* Set MP attribute length. */ | |
9985f83c | 2612 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 2613 | } |
2614 | #endif /* HAVE_IPV6 */ | |
2615 | ||
718e3744 | 2616 | /* Return total size of attribute. */ |
9985f83c | 2617 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 2618 | stream_putw_at (s, cp, len); |
2619 | } |