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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 along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
27 | #include "stream.h" | |
28 | #include "log.h" | |
29 | #include "hash.h" | |
30 | #include "jhash.h" | |
31 | #include "queue.h" | |
32 | #include "table.h" | |
33 | #include "filter.h" | |
34 | #include "command.h" | |
35 | ||
36 | #include "bgpd/bgpd.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_route.h" | |
39 | #include "bgpd/bgp_aspath.h" | |
40 | #include "bgpd/bgp_community.h" | |
41 | #include "bgpd/bgp_debug.h" | |
42 | #include "bgpd/bgp_errors.h" | |
43 | #include "bgpd/bgp_label.h" | |
44 | #include "bgpd/bgp_packet.h" | |
45 | #include "bgpd/bgp_ecommunity.h" | |
46 | #include "bgpd/bgp_lcommunity.h" | |
47 | #include "bgpd/bgp_updgrp.h" | |
48 | #include "bgpd/bgp_encap_types.h" | |
49 | #if ENABLE_BGP_VNC | |
50 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" | |
51 | #include "bgp_encap_types.h" | |
52 | #include "bgp_vnc_types.h" | |
53 | #endif | |
54 | #include "bgp_encap_types.h" | |
55 | #include "bgp_evpn.h" | |
56 | #include "bgp_flowspec_private.h" | |
57 | ||
58 | /* Attribute strings for logging. */ | |
59 | static const struct message attr_str[] = { | |
60 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
61 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
62 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
63 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
64 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
65 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
66 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
67 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
68 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
69 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
70 | {BGP_ATTR_DPA, "DPA"}, | |
71 | {BGP_ATTR_ADVERTISER, "ADVERTISER"}, | |
72 | {BGP_ATTR_RCID_PATH, "RCID_PATH"}, | |
73 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, | |
74 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
75 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
76 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
77 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
78 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
79 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, | |
80 | {BGP_ATTR_ENCAP, "ENCAP"}, | |
81 | #if ENABLE_BGP_VNC | |
82 | {BGP_ATTR_VNC, "VNC"}, | |
83 | #endif | |
84 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, | |
85 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
86 | {0}}; | |
87 | ||
88 | static const struct message attr_flag_str[] = { | |
89 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
90 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
91 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
92 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
93 | this list */ | |
94 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
95 | {0}}; | |
96 | ||
97 | static struct hash *cluster_hash; | |
98 | ||
99 | static void *cluster_hash_alloc(void *p) | |
100 | { | |
101 | const struct cluster_list *val = (const struct cluster_list *)p; | |
102 | struct cluster_list *cluster; | |
103 | ||
104 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); | |
105 | cluster->length = val->length; | |
106 | ||
107 | if (cluster->length) { | |
108 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
109 | memcpy(cluster->list, val->list, val->length); | |
110 | } else | |
111 | cluster->list = NULL; | |
112 | ||
113 | cluster->refcnt = 0; | |
114 | ||
115 | return cluster; | |
116 | } | |
117 | ||
118 | /* Cluster list related functions. */ | |
119 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) | |
120 | { | |
121 | struct cluster_list tmp; | |
122 | struct cluster_list *cluster; | |
123 | ||
124 | tmp.length = length; | |
125 | tmp.list = pnt; | |
126 | ||
127 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); | |
128 | cluster->refcnt++; | |
129 | return cluster; | |
130 | } | |
131 | ||
132 | int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) | |
133 | { | |
134 | int i; | |
135 | ||
136 | for (i = 0; i < cluster->length / 4; i++) | |
137 | if (cluster->list[i].s_addr == originator.s_addr) | |
138 | return 1; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static unsigned int cluster_hash_key_make(void *p) | |
143 | { | |
144 | const struct cluster_list *cluster = p; | |
145 | ||
146 | return jhash(cluster->list, cluster->length, 0); | |
147 | } | |
148 | ||
149 | static bool cluster_hash_cmp(const void *p1, const void *p2) | |
150 | { | |
151 | const struct cluster_list *cluster1 = p1; | |
152 | const struct cluster_list *cluster2 = p2; | |
153 | ||
154 | return (cluster1->length == cluster2->length | |
155 | && memcmp(cluster1->list, cluster2->list, cluster1->length) | |
156 | == 0); | |
157 | } | |
158 | ||
159 | static void cluster_free(struct cluster_list *cluster) | |
160 | { | |
161 | if (cluster->list) | |
162 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); | |
163 | XFREE(MTYPE_CLUSTER, cluster); | |
164 | } | |
165 | ||
166 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) | |
167 | { | |
168 | struct cluster_list *find; | |
169 | ||
170 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); | |
171 | find->refcnt++; | |
172 | ||
173 | return find; | |
174 | } | |
175 | ||
176 | void cluster_unintern(struct cluster_list *cluster) | |
177 | { | |
178 | if (cluster->refcnt) | |
179 | cluster->refcnt--; | |
180 | ||
181 | if (cluster->refcnt == 0) { | |
182 | hash_release(cluster_hash, cluster); | |
183 | cluster_free(cluster); | |
184 | } | |
185 | } | |
186 | ||
187 | static void cluster_init(void) | |
188 | { | |
189 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, | |
190 | "BGP Cluster"); | |
191 | } | |
192 | ||
193 | static void cluster_finish(void) | |
194 | { | |
195 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); | |
196 | hash_free(cluster_hash); | |
197 | cluster_hash = NULL; | |
198 | } | |
199 | ||
200 | static struct hash *encap_hash = NULL; | |
201 | #if ENABLE_BGP_VNC | |
202 | static struct hash *vnc_hash = NULL; | |
203 | #endif | |
204 | ||
205 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) | |
206 | { | |
207 | struct bgp_attr_encap_subtlv *new; | |
208 | struct bgp_attr_encap_subtlv *tail; | |
209 | struct bgp_attr_encap_subtlv *p; | |
210 | ||
211 | for (p = orig, tail = new = NULL; p; p = p->next) { | |
212 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; | |
213 | if (tail) { | |
214 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
215 | tail = tail->next; | |
216 | } else { | |
217 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
218 | } | |
219 | assert(tail); | |
220 | memcpy(tail, p, size); | |
221 | tail->next = NULL; | |
222 | } | |
223 | ||
224 | return new; | |
225 | } | |
226 | ||
227 | static void encap_free(struct bgp_attr_encap_subtlv *p) | |
228 | { | |
229 | struct bgp_attr_encap_subtlv *next; | |
230 | while (p) { | |
231 | next = p->next; | |
232 | p->next = NULL; | |
233 | XFREE(MTYPE_ENCAP_TLV, p); | |
234 | p = next; | |
235 | } | |
236 | } | |
237 | ||
238 | void bgp_attr_flush_encap(struct attr *attr) | |
239 | { | |
240 | if (!attr) | |
241 | return; | |
242 | ||
243 | if (attr->encap_subtlvs) { | |
244 | encap_free(attr->encap_subtlvs); | |
245 | attr->encap_subtlvs = NULL; | |
246 | } | |
247 | #if ENABLE_BGP_VNC | |
248 | if (attr->vnc_subtlvs) { | |
249 | encap_free(attr->vnc_subtlvs); | |
250 | attr->vnc_subtlvs = NULL; | |
251 | } | |
252 | #endif | |
253 | } | |
254 | ||
255 | /* | |
256 | * Compare encap sub-tlv chains | |
257 | * | |
258 | * 1 = equivalent | |
259 | * 0 = not equivalent | |
260 | * | |
261 | * This algorithm could be made faster if needed | |
262 | */ | |
263 | static int encap_same(const struct bgp_attr_encap_subtlv *h1, | |
264 | const struct bgp_attr_encap_subtlv *h2) | |
265 | { | |
266 | const struct bgp_attr_encap_subtlv *p; | |
267 | const struct bgp_attr_encap_subtlv *q; | |
268 | ||
269 | if (h1 == h2) | |
270 | return 1; | |
271 | if (h1 == NULL || h2 == NULL) | |
272 | return 0; | |
273 | ||
274 | for (p = h1; p; p = p->next) { | |
275 | for (q = h2; q; q = q->next) { | |
276 | if ((p->type == q->type) && (p->length == q->length) | |
277 | && !memcmp(p->value, q->value, p->length)) { | |
278 | ||
279 | break; | |
280 | } | |
281 | } | |
282 | if (!q) | |
283 | return 0; | |
284 | } | |
285 | ||
286 | for (p = h2; p; p = p->next) { | |
287 | for (q = h1; q; q = q->next) { | |
288 | if ((p->type == q->type) && (p->length == q->length) | |
289 | && !memcmp(p->value, q->value, p->length)) { | |
290 | ||
291 | break; | |
292 | } | |
293 | } | |
294 | if (!q) | |
295 | return 0; | |
296 | } | |
297 | ||
298 | return 1; | |
299 | } | |
300 | ||
301 | static void *encap_hash_alloc(void *p) | |
302 | { | |
303 | /* Encap structure is already allocated. */ | |
304 | return p; | |
305 | } | |
306 | ||
307 | typedef enum { | |
308 | ENCAP_SUBTLV_TYPE, | |
309 | #if ENABLE_BGP_VNC | |
310 | VNC_SUBTLV_TYPE | |
311 | #endif | |
312 | } encap_subtlv_type; | |
313 | ||
314 | static struct bgp_attr_encap_subtlv * | |
315 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) | |
316 | { | |
317 | struct bgp_attr_encap_subtlv *find; | |
318 | struct hash *hash = encap_hash; | |
319 | #if ENABLE_BGP_VNC | |
320 | if (type == VNC_SUBTLV_TYPE) | |
321 | hash = vnc_hash; | |
322 | #endif | |
323 | ||
324 | find = hash_get(hash, encap, encap_hash_alloc); | |
325 | if (find != encap) | |
326 | encap_free(encap); | |
327 | find->refcnt++; | |
328 | ||
329 | return find; | |
330 | } | |
331 | ||
332 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, | |
333 | encap_subtlv_type type) | |
334 | { | |
335 | struct bgp_attr_encap_subtlv *encap = *encapp; | |
336 | if (encap->refcnt) | |
337 | encap->refcnt--; | |
338 | ||
339 | if (encap->refcnt == 0) { | |
340 | struct hash *hash = encap_hash; | |
341 | #if ENABLE_BGP_VNC | |
342 | if (type == VNC_SUBTLV_TYPE) | |
343 | hash = vnc_hash; | |
344 | #endif | |
345 | hash_release(hash, encap); | |
346 | encap_free(encap); | |
347 | *encapp = NULL; | |
348 | } | |
349 | } | |
350 | ||
351 | static unsigned int encap_hash_key_make(void *p) | |
352 | { | |
353 | const struct bgp_attr_encap_subtlv *encap = p; | |
354 | ||
355 | return jhash(encap->value, encap->length, 0); | |
356 | } | |
357 | ||
358 | static bool encap_hash_cmp(const void *p1, const void *p2) | |
359 | { | |
360 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, | |
361 | (const struct bgp_attr_encap_subtlv *)p2); | |
362 | } | |
363 | ||
364 | static void encap_init(void) | |
365 | { | |
366 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, | |
367 | "BGP Encap Hash"); | |
368 | #if ENABLE_BGP_VNC | |
369 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, | |
370 | "BGP VNC Hash"); | |
371 | #endif | |
372 | } | |
373 | ||
374 | static void encap_finish(void) | |
375 | { | |
376 | hash_clean(encap_hash, (void (*)(void *))encap_free); | |
377 | hash_free(encap_hash); | |
378 | encap_hash = NULL; | |
379 | #if ENABLE_BGP_VNC | |
380 | hash_clean(vnc_hash, (void (*)(void *))encap_free); | |
381 | hash_free(vnc_hash); | |
382 | vnc_hash = NULL; | |
383 | #endif | |
384 | } | |
385 | ||
386 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) | |
387 | { | |
388 | if (!a1 && a2) | |
389 | return false; | |
390 | if (!a2 && a1) | |
391 | return false; | |
392 | if (!a1 && !a2) | |
393 | return true; | |
394 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
395 | sizeof(struct overlay_index)); | |
396 | } | |
397 | ||
398 | /* Unknown transit attribute. */ | |
399 | static struct hash *transit_hash; | |
400 | ||
401 | static void transit_free(struct transit *transit) | |
402 | { | |
403 | if (transit->val) | |
404 | XFREE(MTYPE_TRANSIT_VAL, transit->val); | |
405 | XFREE(MTYPE_TRANSIT, transit); | |
406 | } | |
407 | ||
408 | static void *transit_hash_alloc(void *p) | |
409 | { | |
410 | /* Transit structure is already allocated. */ | |
411 | return p; | |
412 | } | |
413 | ||
414 | static struct transit *transit_intern(struct transit *transit) | |
415 | { | |
416 | struct transit *find; | |
417 | ||
418 | find = hash_get(transit_hash, transit, transit_hash_alloc); | |
419 | if (find != transit) | |
420 | transit_free(transit); | |
421 | find->refcnt++; | |
422 | ||
423 | return find; | |
424 | } | |
425 | ||
426 | void transit_unintern(struct transit *transit) | |
427 | { | |
428 | if (transit->refcnt) | |
429 | transit->refcnt--; | |
430 | ||
431 | if (transit->refcnt == 0) { | |
432 | hash_release(transit_hash, transit); | |
433 | transit_free(transit); | |
434 | } | |
435 | } | |
436 | ||
437 | static unsigned int transit_hash_key_make(void *p) | |
438 | { | |
439 | const struct transit *transit = p; | |
440 | ||
441 | return jhash(transit->val, transit->length, 0); | |
442 | } | |
443 | ||
444 | static bool transit_hash_cmp(const void *p1, const void *p2) | |
445 | { | |
446 | const struct transit *transit1 = p1; | |
447 | const struct transit *transit2 = p2; | |
448 | ||
449 | return (transit1->length == transit2->length | |
450 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
451 | } | |
452 | ||
453 | static void transit_init(void) | |
454 | { | |
455 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, | |
456 | "BGP Transit Hash"); | |
457 | } | |
458 | ||
459 | static void transit_finish(void) | |
460 | { | |
461 | hash_clean(transit_hash, (void (*)(void *))transit_free); | |
462 | hash_free(transit_hash); | |
463 | transit_hash = NULL; | |
464 | } | |
465 | ||
466 | /* Attribute hash routines. */ | |
467 | static struct hash *attrhash; | |
468 | ||
469 | /* Shallow copy of an attribute | |
470 | * Though, not so shallow that it doesn't copy the contents | |
471 | * of the attr_extra pointed to by 'extra' | |
472 | */ | |
473 | void bgp_attr_dup(struct attr *new, struct attr *orig) | |
474 | { | |
475 | *new = *orig; | |
476 | } | |
477 | ||
478 | unsigned long int attr_count(void) | |
479 | { | |
480 | return attrhash->count; | |
481 | } | |
482 | ||
483 | unsigned long int attr_unknown_count(void) | |
484 | { | |
485 | return transit_hash->count; | |
486 | } | |
487 | ||
488 | unsigned int attrhash_key_make(void *p) | |
489 | { | |
490 | const struct attr *attr = (struct attr *)p; | |
491 | uint32_t key = 0; | |
492 | #define MIX(val) key = jhash_1word(val, key) | |
493 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) | |
494 | ||
495 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); | |
496 | MIX3(attr->local_pref, attr->aggregator_as, | |
497 | attr->aggregator_addr.s_addr); | |
498 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, | |
499 | attr->originator_id.s_addr); | |
500 | MIX3(attr->tag, attr->label, attr->label_index); | |
501 | ||
502 | if (attr->aspath) | |
503 | MIX(aspath_key_make(attr->aspath)); | |
504 | if (attr->community) | |
505 | MIX(community_hash_make(attr->community)); | |
506 | ||
507 | if (attr->lcommunity) | |
508 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
509 | if (attr->ecommunity) | |
510 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
511 | if (attr->cluster) | |
512 | MIX(cluster_hash_key_make(attr->cluster)); | |
513 | if (attr->transit) | |
514 | MIX(transit_hash_key_make(attr->transit)); | |
515 | if (attr->encap_subtlvs) | |
516 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
517 | #if ENABLE_BGP_VNC | |
518 | if (attr->vnc_subtlvs) | |
519 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
520 | #endif | |
521 | MIX(attr->mp_nexthop_len); | |
522 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
523 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
524 | MIX(attr->nh_ifindex); | |
525 | MIX(attr->nh_lla_ifindex); | |
526 | ||
527 | return key; | |
528 | } | |
529 | ||
530 | bool attrhash_cmp(const void *p1, const void *p2) | |
531 | { | |
532 | const struct attr *attr1 = p1; | |
533 | const struct attr *attr2 = p2; | |
534 | ||
535 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
536 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
537 | && attr1->aspath == attr2->aspath | |
538 | && attr1->community == attr2->community && attr1->med == attr2->med | |
539 | && attr1->local_pref == attr2->local_pref | |
540 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
541 | if (attr1->aggregator_as == attr2->aggregator_as | |
542 | && attr1->aggregator_addr.s_addr | |
543 | == attr2->aggregator_addr.s_addr | |
544 | && attr1->weight == attr2->weight | |
545 | && attr1->tag == attr2->tag | |
546 | && attr1->label_index == attr2->label_index | |
547 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
548 | && attr1->ecommunity == attr2->ecommunity | |
549 | && attr1->lcommunity == attr2->lcommunity | |
550 | && attr1->cluster == attr2->cluster | |
551 | && attr1->transit == attr2->transit | |
552 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
553 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
554 | #if ENABLE_BGP_VNC | |
555 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) | |
556 | #endif | |
557 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, | |
558 | &attr2->mp_nexthop_global) | |
559 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
560 | &attr2->mp_nexthop_local) | |
561 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
562 | &attr2->mp_nexthop_global_in) | |
563 | && IPV4_ADDR_SAME(&attr1->originator_id, | |
564 | &attr2->originator_id) | |
565 | && overlay_index_same(attr1, attr2) | |
566 | && attr1->nh_ifindex == attr2->nh_ifindex | |
567 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex) | |
568 | return true; | |
569 | } | |
570 | ||
571 | return false; | |
572 | } | |
573 | ||
574 | static void attrhash_init(void) | |
575 | { | |
576 | attrhash = | |
577 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
578 | } | |
579 | ||
580 | /* | |
581 | * special for hash_clean below | |
582 | */ | |
583 | static void attr_vfree(void *attr) | |
584 | { | |
585 | XFREE(MTYPE_ATTR, attr); | |
586 | } | |
587 | ||
588 | static void attrhash_finish(void) | |
589 | { | |
590 | hash_clean(attrhash, attr_vfree); | |
591 | hash_free(attrhash); | |
592 | attrhash = NULL; | |
593 | } | |
594 | ||
595 | static void attr_show_all_iterator(struct hash_backet *backet, struct vty *vty) | |
596 | { | |
597 | struct attr *attr = backet->data; | |
598 | ||
599 | vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt, | |
600 | inet_ntoa(attr->nexthop)); | |
601 | vty_out(vty, "\tflags: %" PRIu64 " med: %u local_pref: %u origin: %u weight: %u label: %u\n", | |
602 | attr->flag, attr->med, attr->local_pref, attr->origin, | |
603 | attr->weight, attr->label); | |
604 | } | |
605 | ||
606 | void attr_show_all(struct vty *vty) | |
607 | { | |
608 | hash_iterate(attrhash, (void (*)(struct hash_backet *, | |
609 | void *))attr_show_all_iterator, | |
610 | vty); | |
611 | } | |
612 | ||
613 | static void *bgp_attr_hash_alloc(void *p) | |
614 | { | |
615 | struct attr *val = (struct attr *)p; | |
616 | struct attr *attr; | |
617 | ||
618 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); | |
619 | *attr = *val; | |
620 | if (val->encap_subtlvs) { | |
621 | val->encap_subtlvs = NULL; | |
622 | } | |
623 | #if ENABLE_BGP_VNC | |
624 | if (val->vnc_subtlvs) { | |
625 | val->vnc_subtlvs = NULL; | |
626 | } | |
627 | #endif | |
628 | attr->refcnt = 0; | |
629 | return attr; | |
630 | } | |
631 | ||
632 | /* Internet argument attribute. */ | |
633 | struct attr *bgp_attr_intern(struct attr *attr) | |
634 | { | |
635 | struct attr *find; | |
636 | ||
637 | /* Intern referenced strucutre. */ | |
638 | if (attr->aspath) { | |
639 | if (!attr->aspath->refcnt) | |
640 | attr->aspath = aspath_intern(attr->aspath); | |
641 | else | |
642 | attr->aspath->refcnt++; | |
643 | } | |
644 | if (attr->community) { | |
645 | if (!attr->community->refcnt) | |
646 | attr->community = community_intern(attr->community); | |
647 | else | |
648 | attr->community->refcnt++; | |
649 | } | |
650 | ||
651 | if (attr->ecommunity) { | |
652 | if (!attr->ecommunity->refcnt) | |
653 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
654 | else | |
655 | attr->ecommunity->refcnt++; | |
656 | } | |
657 | if (attr->lcommunity) { | |
658 | if (!attr->lcommunity->refcnt) | |
659 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
660 | else | |
661 | attr->lcommunity->refcnt++; | |
662 | } | |
663 | if (attr->cluster) { | |
664 | if (!attr->cluster->refcnt) | |
665 | attr->cluster = cluster_intern(attr->cluster); | |
666 | else | |
667 | attr->cluster->refcnt++; | |
668 | } | |
669 | if (attr->transit) { | |
670 | if (!attr->transit->refcnt) | |
671 | attr->transit = transit_intern(attr->transit); | |
672 | else | |
673 | attr->transit->refcnt++; | |
674 | } | |
675 | if (attr->encap_subtlvs) { | |
676 | if (!attr->encap_subtlvs->refcnt) | |
677 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
678 | ENCAP_SUBTLV_TYPE); | |
679 | else | |
680 | attr->encap_subtlvs->refcnt++; | |
681 | } | |
682 | #if ENABLE_BGP_VNC | |
683 | if (attr->vnc_subtlvs) { | |
684 | if (!attr->vnc_subtlvs->refcnt) | |
685 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
686 | VNC_SUBTLV_TYPE); | |
687 | else | |
688 | attr->vnc_subtlvs->refcnt++; | |
689 | } | |
690 | #endif | |
691 | ||
692 | /* At this point, attr only contains intern'd pointers. that means | |
693 | * if we find it in attrhash, it has all the same pointers and we | |
694 | * correctly updated the refcounts on these. | |
695 | * If we don't find it, we need to allocate a one because in all | |
696 | * cases this returns a new reference to a hashed attr, but the input | |
697 | * wasn't on hash. */ | |
698 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); | |
699 | find->refcnt++; | |
700 | ||
701 | return find; | |
702 | } | |
703 | ||
704 | /* Make network statement's attribute. */ | |
705 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) | |
706 | { | |
707 | memset(attr, 0, sizeof(struct attr)); | |
708 | ||
709 | attr->origin = origin; | |
710 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
711 | attr->aspath = aspath_empty(); | |
712 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
713 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
714 | attr->tag = 0; | |
715 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
716 | attr->label = MPLS_INVALID_LABEL; | |
717 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
718 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
719 | ||
720 | return attr; | |
721 | } | |
722 | ||
723 | /* Create the attributes for an aggregate */ | |
724 | struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, uint8_t origin, | |
725 | struct aspath *aspath, | |
726 | struct community *community, | |
727 | struct ecommunity *ecommunity, | |
728 | struct lcommunity *lcommunity, | |
729 | int as_set, uint8_t atomic_aggregate) | |
730 | { | |
731 | struct attr attr; | |
732 | struct attr *new; | |
733 | ||
734 | memset(&attr, 0, sizeof(struct attr)); | |
735 | ||
736 | /* Origin attribute. */ | |
737 | attr.origin = origin; | |
738 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
739 | ||
740 | /* AS path attribute. */ | |
741 | if (aspath) | |
742 | attr.aspath = aspath_intern(aspath); | |
743 | else | |
744 | attr.aspath = aspath_empty(); | |
745 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
746 | ||
747 | /* Next hop attribute. */ | |
748 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
749 | ||
750 | if (community) { | |
751 | uint32_t gshut = COMMUNITY_GSHUT; | |
752 | ||
753 | /* If we are not shutting down ourselves and we are | |
754 | * aggregating a route that contains the GSHUT community we | |
755 | * need to remove that community when creating the aggregate */ | |
756 | if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN) | |
757 | && community_include(community, gshut)) { | |
758 | community_del_val(community, &gshut); | |
759 | } | |
760 | ||
761 | attr.community = community; | |
762 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
763 | } | |
764 | ||
765 | if (ecommunity) { | |
766 | attr.ecommunity = ecommunity; | |
767 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
768 | } | |
769 | ||
770 | if (lcommunity) { | |
771 | attr.lcommunity = lcommunity; | |
772 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
773 | } | |
774 | ||
775 | if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) { | |
776 | bgp_attr_add_gshut_community(&attr); | |
777 | } | |
778 | ||
779 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
780 | attr.label = MPLS_INVALID_LABEL; | |
781 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
782 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
783 | if (!as_set || atomic_aggregate) | |
784 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
785 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
786 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
787 | attr.aggregator_as = bgp->confed_id; | |
788 | else | |
789 | attr.aggregator_as = bgp->as; | |
790 | attr.aggregator_addr = bgp->router_id; | |
791 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
792 | attr.label = MPLS_INVALID_LABEL; | |
793 | ||
794 | new = bgp_attr_intern(&attr); | |
795 | ||
796 | aspath_unintern(&new->aspath); | |
797 | return new; | |
798 | } | |
799 | ||
800 | /* Unintern just the sub-components of the attr, but not the attr */ | |
801 | void bgp_attr_unintern_sub(struct attr *attr) | |
802 | { | |
803 | /* aspath refcount shoud be decrement. */ | |
804 | if (attr->aspath) | |
805 | aspath_unintern(&attr->aspath); | |
806 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
807 | ||
808 | if (attr->community) | |
809 | community_unintern(&attr->community); | |
810 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
811 | ||
812 | if (attr->ecommunity) | |
813 | ecommunity_unintern(&attr->ecommunity); | |
814 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
815 | ||
816 | if (attr->lcommunity) | |
817 | lcommunity_unintern(&attr->lcommunity); | |
818 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
819 | ||
820 | if (attr->cluster) | |
821 | cluster_unintern(attr->cluster); | |
822 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); | |
823 | ||
824 | if (attr->transit) | |
825 | transit_unintern(attr->transit); | |
826 | ||
827 | if (attr->encap_subtlvs) | |
828 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
829 | ||
830 | #if ENABLE_BGP_VNC | |
831 | if (attr->vnc_subtlvs) | |
832 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
833 | #endif | |
834 | } | |
835 | ||
836 | /* | |
837 | * We have some show commands that let you experimentally | |
838 | * apply a route-map. When we apply the route-map | |
839 | * we are reseting values but not saving them for | |
840 | * posterity via intern'ing( because route-maps don't | |
841 | * do that) but at this point in time we need | |
842 | * to compare the new attr to the old and if the | |
843 | * routemap has changed it we need to, as Snoop Dog says, | |
844 | * Drop it like it's hot | |
845 | */ | |
846 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
847 | { | |
848 | if (new->aspath != old->aspath) | |
849 | aspath_free(new->aspath); | |
850 | ||
851 | if (new->community != old->community) | |
852 | community_free(&new->community); | |
853 | ||
854 | if (new->ecommunity != old->ecommunity) | |
855 | ecommunity_free(&new->ecommunity); | |
856 | ||
857 | if (new->lcommunity != old->lcommunity) | |
858 | lcommunity_free(&new->lcommunity); | |
859 | } | |
860 | ||
861 | /* Free bgp attribute and aspath. */ | |
862 | void bgp_attr_unintern(struct attr **pattr) | |
863 | { | |
864 | struct attr *attr = *pattr; | |
865 | struct attr *ret; | |
866 | struct attr tmp; | |
867 | ||
868 | /* Decrement attribute reference. */ | |
869 | attr->refcnt--; | |
870 | ||
871 | tmp = *attr; | |
872 | ||
873 | /* If reference becomes zero then free attribute object. */ | |
874 | if (attr->refcnt == 0) { | |
875 | ret = hash_release(attrhash, attr); | |
876 | assert(ret != NULL); | |
877 | XFREE(MTYPE_ATTR, attr); | |
878 | *pattr = NULL; | |
879 | } | |
880 | ||
881 | bgp_attr_unintern_sub(&tmp); | |
882 | } | |
883 | ||
884 | void bgp_attr_flush(struct attr *attr) | |
885 | { | |
886 | if (attr->aspath && !attr->aspath->refcnt) { | |
887 | aspath_free(attr->aspath); | |
888 | attr->aspath = NULL; | |
889 | } | |
890 | if (attr->community && !attr->community->refcnt) | |
891 | community_free(&attr->community); | |
892 | if (attr->ecommunity && !attr->ecommunity->refcnt) | |
893 | ecommunity_free(&attr->ecommunity); | |
894 | if (attr->lcommunity && !attr->lcommunity->refcnt) | |
895 | lcommunity_free(&attr->lcommunity); | |
896 | if (attr->cluster && !attr->cluster->refcnt) { | |
897 | cluster_free(attr->cluster); | |
898 | attr->cluster = NULL; | |
899 | } | |
900 | if (attr->transit && !attr->transit->refcnt) { | |
901 | transit_free(attr->transit); | |
902 | attr->transit = NULL; | |
903 | } | |
904 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
905 | encap_free(attr->encap_subtlvs); | |
906 | attr->encap_subtlvs = NULL; | |
907 | } | |
908 | #if ENABLE_BGP_VNC | |
909 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { | |
910 | encap_free(attr->vnc_subtlvs); | |
911 | attr->vnc_subtlvs = NULL; | |
912 | } | |
913 | #endif | |
914 | } | |
915 | ||
916 | /* Implement draft-scudder-idr-optional-transitive behaviour and | |
917 | * avoid resetting sessions for malformed attributes which are | |
918 | * are partial/optional and hence where the error likely was not | |
919 | * introduced by the sending neighbour. | |
920 | */ | |
921 | static bgp_attr_parse_ret_t | |
922 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, | |
923 | bgp_size_t length) | |
924 | { | |
925 | struct peer *const peer = args->peer; | |
926 | const uint8_t flags = args->flags; | |
927 | /* startp and length must be special-cased, as whether or not to | |
928 | * send the attribute data with the NOTIFY depends on the error, | |
929 | * the caller therefore signals this with the seperate length argument | |
930 | */ | |
931 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); | |
932 | ||
933 | /* Only relax error handling for eBGP peers */ | |
934 | if (peer->sort != BGP_PEER_EBGP) { | |
935 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
936 | notify_datap, length); | |
937 | return BGP_ATTR_PARSE_ERROR; | |
938 | } | |
939 | ||
940 | /* Adjust the stream getp to the end of the attribute, in case we can | |
941 | * still proceed but the caller hasn't read all the attribute. | |
942 | */ | |
943 | stream_set_getp(BGP_INPUT(peer), | |
944 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
945 | + args->total); | |
946 | ||
947 | switch (args->type) { | |
948 | /* where an attribute is relatively inconsequential, e.g. it does not | |
949 | * affect route selection, and can be safely ignored, then any such | |
950 | * attributes which are malformed should just be ignored and the route | |
951 | * processed as normal. | |
952 | */ | |
953 | case BGP_ATTR_AS4_AGGREGATOR: | |
954 | case BGP_ATTR_AGGREGATOR: | |
955 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
956 | return BGP_ATTR_PARSE_PROCEED; | |
957 | ||
958 | /* Core attributes, particularly ones which may influence route | |
959 | * selection, should always cause session resets | |
960 | */ | |
961 | case BGP_ATTR_ORIGIN: | |
962 | case BGP_ATTR_AS_PATH: | |
963 | case BGP_ATTR_NEXT_HOP: | |
964 | case BGP_ATTR_MULTI_EXIT_DISC: | |
965 | case BGP_ATTR_LOCAL_PREF: | |
966 | case BGP_ATTR_COMMUNITIES: | |
967 | case BGP_ATTR_ORIGINATOR_ID: | |
968 | case BGP_ATTR_CLUSTER_LIST: | |
969 | case BGP_ATTR_MP_REACH_NLRI: | |
970 | case BGP_ATTR_MP_UNREACH_NLRI: | |
971 | case BGP_ATTR_EXT_COMMUNITIES: | |
972 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
973 | notify_datap, length); | |
974 | return BGP_ATTR_PARSE_ERROR; | |
975 | } | |
976 | ||
977 | /* Partial optional attributes that are malformed should not cause | |
978 | * the whole session to be reset. Instead treat it as a withdrawal | |
979 | * of the routes, if possible. | |
980 | */ | |
981 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
982 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
983 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
984 | return BGP_ATTR_PARSE_WITHDRAW; | |
985 | ||
986 | /* default to reset */ | |
987 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
988 | } | |
989 | ||
990 | /* Find out what is wrong with the path attribute flag bits and log the error. | |
991 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
992 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
993 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
994 | non-transitive" attribute. */ | |
995 | static void | |
996 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, | |
997 | uint8_t desired_flags /* how RFC says it must be */ | |
998 | ) | |
999 | { | |
1000 | uint8_t seen = 0, i; | |
1001 | uint8_t real_flags = args->flags; | |
1002 | const uint8_t attr_code = args->type; | |
1003 | ||
1004 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1005 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1006 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1007 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1008 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1009 | flog_err(EC_BGP_ATTR_FLAG, | |
1010 | "%s attribute must%s be flagged as \"%s\"", | |
1011 | lookup_msg(attr_str, attr_code, NULL), | |
1012 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1013 | ? "" | |
1014 | : " not", | |
1015 | attr_flag_str[i].str); | |
1016 | seen = 1; | |
1017 | } | |
1018 | if (!seen) { | |
1019 | zlog_debug( | |
1020 | "Strange, %s called for attr %s, but no problem found with flags" | |
1021 | " (real flags 0x%x, desired 0x%x)", | |
1022 | __func__, lookup_msg(attr_str, attr_code, NULL), | |
1023 | real_flags, desired_flags); | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | /* Required flags for attributes. EXTLEN will be masked off when testing, | |
1028 | * as will PARTIAL for optional+transitive attributes. | |
1029 | */ | |
1030 | const uint8_t attr_flags_values[] = { | |
1031 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1032 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1033 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1034 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1035 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1036 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1037 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1038 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1039 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1040 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1041 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1042 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1043 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1044 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1045 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1046 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1047 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1048 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1049 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1050 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1051 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1052 | }; | |
1053 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; | |
1054 | ||
1055 | static int bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) | |
1056 | { | |
1057 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
1058 | const uint8_t flags = args->flags; | |
1059 | const uint8_t attr_code = args->type; | |
1060 | ||
1061 | /* there may be attributes we don't know about */ | |
1062 | if (attr_code > attr_flags_values_max) | |
1063 | return 0; | |
1064 | if (attr_flags_values[attr_code] == 0) | |
1065 | return 0; | |
1066 | ||
1067 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1068 | * to | |
1069 | * 1." | |
1070 | */ | |
1071 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1072 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
1073 | flog_err( | |
1074 | EC_BGP_ATTR_FLAG, | |
1075 | "%s well-known attributes must have transitive flag set (%x)", | |
1076 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1077 | return 1; | |
1078 | } | |
1079 | ||
1080 | /* "For well-known attributes and for optional non-transitive | |
1081 | * attributes, | |
1082 | * the Partial bit MUST be set to 0." | |
1083 | */ | |
1084 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1085 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
1086 | flog_err(EC_BGP_ATTR_FLAG, | |
1087 | "%s well-known attribute " | |
1088 | "must NOT have the partial flag set (%x)", | |
1089 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1090 | return 1; | |
1091 | } | |
1092 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1093 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
1094 | flog_err(EC_BGP_ATTR_FLAG, | |
1095 | "%s optional + transitive attribute " | |
1096 | "must NOT have the partial flag set (%x)", | |
1097 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1098 | return 1; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* Optional transitive attributes may go through speakers that don't | |
1103 | * reocgnise them and set the Partial bit. | |
1104 | */ | |
1105 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1106 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1107 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1108 | ||
1109 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
1110 | return 0; | |
1111 | ||
1112 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
1113 | return 1; | |
1114 | } | |
1115 | ||
1116 | /* Get origin attribute of the update message. */ | |
1117 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) | |
1118 | { | |
1119 | struct peer *const peer = args->peer; | |
1120 | struct attr *const attr = args->attr; | |
1121 | const bgp_size_t length = args->length; | |
1122 | ||
1123 | /* If any recognized attribute has Attribute Length that conflicts | |
1124 | with the expected length (based on the attribute type code), then | |
1125 | the Error Subcode is set to Attribute Length Error. The Data | |
1126 | field contains the erroneous attribute (type, length and | |
1127 | value). */ | |
1128 | if (length != 1) { | |
1129 | flog_err(EC_BGP_ATTR_LEN, | |
1130 | "Origin attribute length is not one %d", length); | |
1131 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1132 | args->total); | |
1133 | } | |
1134 | ||
1135 | /* Fetch origin attribute. */ | |
1136 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1137 | ||
1138 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1139 | Subcode is set to Invalid Origin Attribute. The Data field | |
1140 | contains the unrecognized attribute (type, length and value). */ | |
1141 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1142 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
1143 | flog_err(EC_BGP_ATTR_ORIGIN, | |
1144 | "Origin attribute value is invalid %d", attr->origin); | |
1145 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
1146 | args->total); | |
1147 | } | |
1148 | ||
1149 | /* Set oring attribute flag. */ | |
1150 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | /* Parse AS path information. This function is wrapper of | |
1156 | aspath_parse. */ | |
1157 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) | |
1158 | { | |
1159 | struct attr *const attr = args->attr; | |
1160 | struct peer *const peer = args->peer; | |
1161 | const bgp_size_t length = args->length; | |
1162 | ||
1163 | /* | |
1164 | * peer with AS4 => will get 4Byte ASnums | |
1165 | * otherwise, will get 16 Bit | |
1166 | */ | |
1167 | attr->aspath = aspath_parse(peer->curr, length, | |
1168 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); | |
1169 | ||
1170 | /* In case of IBGP, length will be zero. */ | |
1171 | if (!attr->aspath) { | |
1172 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, | |
1173 | "Malformed AS path from %s, length is %d", peer->host, | |
1174 | length); | |
1175 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1176 | 0); | |
1177 | } | |
1178 | ||
1179 | /* Set aspath attribute flag. */ | |
1180 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1181 | ||
1182 | return BGP_ATTR_PARSE_PROCEED; | |
1183 | } | |
1184 | ||
1185 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1186 | struct attr *const attr) | |
1187 | { | |
1188 | /* These checks were part of bgp_attr_aspath, but with | |
1189 | * as4 we should to check aspath things when | |
1190 | * aspath synthesizing with as4_path has already taken place. | |
1191 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1192 | * not right. | |
1193 | * So do the checks later, i.e. here | |
1194 | */ | |
1195 | struct aspath *aspath; | |
1196 | ||
1197 | /* Confederation sanity check. */ | |
1198 | if ((peer->sort == BGP_PEER_CONFED | |
1199 | && !aspath_left_confed_check(attr->aspath)) | |
1200 | || (peer->sort == BGP_PEER_EBGP | |
1201 | && aspath_confed_check(attr->aspath))) { | |
1202 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", | |
1203 | peer->host); | |
1204 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1205 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1206 | return BGP_ATTR_PARSE_ERROR; | |
1207 | } | |
1208 | ||
1209 | /* First AS check for EBGP. */ | |
1210 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { | |
1211 | if (peer->sort == BGP_PEER_EBGP | |
1212 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
1213 | flog_err(EC_BGP_ATTR_FIRST_AS, | |
1214 | "%s incorrect first AS (must be %u)", | |
1215 | peer->host, peer->as); | |
1216 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1217 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1218 | return BGP_ATTR_PARSE_ERROR; | |
1219 | } | |
1220 | } | |
1221 | ||
1222 | /* local-as prepend */ | |
1223 | if (peer->change_local_as | |
1224 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1225 | aspath = aspath_dup(attr->aspath); | |
1226 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1227 | aspath_unintern(&attr->aspath); | |
1228 | attr->aspath = aspath_intern(aspath); | |
1229 | } | |
1230 | ||
1231 | return BGP_ATTR_PARSE_PROCEED; | |
1232 | } | |
1233 | ||
1234 | /* Parse AS4 path information. This function is another wrapper of | |
1235 | aspath_parse. */ | |
1236 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, | |
1237 | struct aspath **as4_path) | |
1238 | { | |
1239 | struct peer *const peer = args->peer; | |
1240 | struct attr *const attr = args->attr; | |
1241 | const bgp_size_t length = args->length; | |
1242 | ||
1243 | *as4_path = aspath_parse(peer->curr, length, 1); | |
1244 | ||
1245 | /* In case of IBGP, length will be zero. */ | |
1246 | if (!*as4_path) { | |
1247 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, | |
1248 | "Malformed AS4 path from %s, length is %d", peer->host, | |
1249 | length); | |
1250 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1251 | 0); | |
1252 | } | |
1253 | ||
1254 | /* Set aspath attribute flag. */ | |
1255 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1256 | ||
1257 | return BGP_ATTR_PARSE_PROCEED; | |
1258 | } | |
1259 | ||
1260 | /* Nexthop attribute. */ | |
1261 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) | |
1262 | { | |
1263 | struct peer *const peer = args->peer; | |
1264 | struct attr *const attr = args->attr; | |
1265 | const bgp_size_t length = args->length; | |
1266 | ||
1267 | in_addr_t nexthop_h, nexthop_n; | |
1268 | ||
1269 | /* Check nexthop attribute length. */ | |
1270 | if (length != 4) { | |
1271 | flog_err(EC_BGP_ATTR_LEN, | |
1272 | "Nexthop attribute length isn't four [%d]", length); | |
1273 | ||
1274 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1275 | args->total); | |
1276 | } | |
1277 | ||
1278 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP | |
1279 | attribute must result in a NOTIFICATION message (this is implemented | |
1280 | below). | |
1281 | At the same time, semantically incorrect NEXT_HOP is more likely to | |
1282 | be just | |
1283 | logged locally (this is implemented somewhere else). The UPDATE | |
1284 | message | |
1285 | gets ignored in any of these cases. */ | |
1286 | nexthop_n = stream_get_ipv4(peer->curr); | |
1287 | nexthop_h = ntohl(nexthop_n); | |
1288 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1289 | || IPV4_CLASS_DE(nexthop_h)) | |
1290 | && !BGP_DEBUG( | |
1291 | allow_martians, | |
1292 | ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
1293 | { | |
1294 | char buf[INET_ADDRSTRLEN]; | |
1295 | inet_ntop(AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); | |
1296 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s", buf); | |
1297 | return bgp_attr_malformed( | |
1298 | args, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, args->total); | |
1299 | } | |
1300 | ||
1301 | attr->nexthop.s_addr = nexthop_n; | |
1302 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1303 | ||
1304 | return BGP_ATTR_PARSE_PROCEED; | |
1305 | } | |
1306 | ||
1307 | /* MED atrribute. */ | |
1308 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) | |
1309 | { | |
1310 | struct peer *const peer = args->peer; | |
1311 | struct attr *const attr = args->attr; | |
1312 | const bgp_size_t length = args->length; | |
1313 | ||
1314 | /* Length check. */ | |
1315 | if (length != 4) { | |
1316 | flog_err(EC_BGP_ATTR_LEN, | |
1317 | "MED attribute length isn't four [%d]", length); | |
1318 | ||
1319 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1320 | args->total); | |
1321 | } | |
1322 | ||
1323 | attr->med = stream_getl(peer->curr); | |
1324 | ||
1325 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); | |
1326 | ||
1327 | return BGP_ATTR_PARSE_PROCEED; | |
1328 | } | |
1329 | ||
1330 | /* Local preference attribute. */ | |
1331 | static bgp_attr_parse_ret_t | |
1332 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) | |
1333 | { | |
1334 | struct peer *const peer = args->peer; | |
1335 | struct attr *const attr = args->attr; | |
1336 | const bgp_size_t length = args->length; | |
1337 | ||
1338 | /* Length check. */ | |
1339 | if (length != 4) { | |
1340 | flog_err(EC_BGP_ATTR_LEN, | |
1341 | "LOCAL_PREF attribute length isn't 4 [%u]", length); | |
1342 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1343 | args->total); | |
1344 | } | |
1345 | ||
1346 | /* If it is contained in an UPDATE message that is received from an | |
1347 | external peer, then this attribute MUST be ignored by the | |
1348 | receiving speaker. */ | |
1349 | if (peer->sort == BGP_PEER_EBGP) { | |
1350 | stream_forward_getp(peer->curr, length); | |
1351 | return BGP_ATTR_PARSE_PROCEED; | |
1352 | } | |
1353 | ||
1354 | attr->local_pref = stream_getl(peer->curr); | |
1355 | ||
1356 | /* Set the local-pref flag. */ | |
1357 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); | |
1358 | ||
1359 | return BGP_ATTR_PARSE_PROCEED; | |
1360 | } | |
1361 | ||
1362 | /* Atomic aggregate. */ | |
1363 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) | |
1364 | { | |
1365 | struct attr *const attr = args->attr; | |
1366 | const bgp_size_t length = args->length; | |
1367 | ||
1368 | /* Length check. */ | |
1369 | if (length != 0) { | |
1370 | flog_err(EC_BGP_ATTR_LEN, | |
1371 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", | |
1372 | length); | |
1373 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1374 | args->total); | |
1375 | } | |
1376 | ||
1377 | /* Set atomic aggregate flag. */ | |
1378 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
1379 | ||
1380 | return BGP_ATTR_PARSE_PROCEED; | |
1381 | } | |
1382 | ||
1383 | /* Aggregator attribute */ | |
1384 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) | |
1385 | { | |
1386 | struct peer *const peer = args->peer; | |
1387 | struct attr *const attr = args->attr; | |
1388 | const bgp_size_t length = args->length; | |
1389 | ||
1390 | int wantedlen = 6; | |
1391 | ||
1392 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
1393 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1394 | wantedlen = 8; | |
1395 | ||
1396 | if (length != wantedlen) { | |
1397 | flog_err(EC_BGP_ATTR_LEN, | |
1398 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, | |
1399 | length); | |
1400 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1401 | args->total); | |
1402 | } | |
1403 | ||
1404 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1405 | attr->aggregator_as = stream_getl(peer->curr); | |
1406 | else | |
1407 | attr->aggregator_as = stream_getw(peer->curr); | |
1408 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1409 | ||
1410 | /* Set atomic aggregate flag. */ | |
1411 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1412 | ||
1413 | return BGP_ATTR_PARSE_PROCEED; | |
1414 | } | |
1415 | ||
1416 | /* New Aggregator attribute */ | |
1417 | static bgp_attr_parse_ret_t | |
1418 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, | |
1419 | as_t *as4_aggregator_as, | |
1420 | struct in_addr *as4_aggregator_addr) | |
1421 | { | |
1422 | struct peer *const peer = args->peer; | |
1423 | struct attr *const attr = args->attr; | |
1424 | const bgp_size_t length = args->length; | |
1425 | ||
1426 | if (length != 8) { | |
1427 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", | |
1428 | length); | |
1429 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1430 | 0); | |
1431 | } | |
1432 | ||
1433 | *as4_aggregator_as = stream_getl(peer->curr); | |
1434 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1435 | ||
1436 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1437 | ||
1438 | return BGP_ATTR_PARSE_PROCEED; | |
1439 | } | |
1440 | ||
1441 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1442 | */ | |
1443 | static bgp_attr_parse_ret_t | |
1444 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, | |
1445 | struct aspath *as4_path, as_t as4_aggregator, | |
1446 | struct in_addr *as4_aggregator_addr) | |
1447 | { | |
1448 | int ignore_as4_path = 0; | |
1449 | struct aspath *newpath; | |
1450 | ||
1451 | if (!attr->aspath) { | |
1452 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1453 | * have | |
1454 | * checked that all well-known, mandatory attributes were | |
1455 | * present. | |
1456 | * | |
1457 | * Can only be a problem with peer itself - hard error | |
1458 | */ | |
1459 | return BGP_ATTR_PARSE_ERROR; | |
1460 | } | |
1461 | ||
1462 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1463 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1464 | * if given. | |
1465 | * It is worth a warning though, because the peer really | |
1466 | * should not send them | |
1467 | */ | |
1468 | if (BGP_DEBUG(as4, AS4)) { | |
1469 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1470 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1471 | "AS4 capable peer, yet it sent"); | |
1472 | ||
1473 | if (attr->flag | |
1474 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1475 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1476 | peer->host, | |
1477 | "AS4 capable peer, yet it sent"); | |
1478 | } | |
1479 | ||
1480 | return BGP_ATTR_PARSE_PROCEED; | |
1481 | } | |
1482 | ||
1483 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1484 | * because that may override AS4_PATH | |
1485 | */ | |
1486 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1487 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1488 | /* received both. | |
1489 | * if the as_number in aggregator is not AS_TRANS, | |
1490 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1491 | * and the Aggregator shall be taken as | |
1492 | * info on the aggregating node, and the AS_PATH | |
1493 | * shall be taken as the AS_PATH | |
1494 | * otherwise | |
1495 | * the Aggregator shall be ignored and the | |
1496 | * AS4_AGGREGATOR shall be taken as the | |
1497 | * Aggregating node and the AS_PATH is to be | |
1498 | * constructed "as in all other cases" | |
1499 | */ | |
1500 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1501 | /* ignore */ | |
1502 | if (BGP_DEBUG(as4, AS4)) | |
1503 | zlog_debug( | |
1504 | "[AS4] %s BGP not AS4 capable peer" | |
1505 | " send AGGREGATOR != AS_TRANS and" | |
1506 | " AS4_AGGREGATOR, so ignore" | |
1507 | " AS4_AGGREGATOR and AS4_PATH", | |
1508 | peer->host); | |
1509 | ignore_as4_path = 1; | |
1510 | } else { | |
1511 | /* "New_aggregator shall be taken as aggregator" | |
1512 | */ | |
1513 | attr->aggregator_as = as4_aggregator; | |
1514 | attr->aggregator_addr.s_addr = | |
1515 | as4_aggregator_addr->s_addr; | |
1516 | } | |
1517 | } else { | |
1518 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1519 | * That is bogus - but reading the conditions | |
1520 | * we have to handle AS4_AGGREGATOR as if it were | |
1521 | * AGGREGATOR in that case | |
1522 | */ | |
1523 | if (BGP_DEBUG(as4, AS4)) | |
1524 | zlog_debug( | |
1525 | "[AS4] %s BGP not AS4 capable peer send" | |
1526 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1527 | " it as if AGGREGATOR with AS_TRANS had been there", | |
1528 | peer->host); | |
1529 | attr->aggregator_as = as4_aggregator; | |
1530 | /* sweep it under the carpet and simulate a "good" | |
1531 | * AGGREGATOR */ | |
1532 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1533 | } | |
1534 | } | |
1535 | ||
1536 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1537 | if (!ignore_as4_path | |
1538 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1539 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
1540 | if (!newpath) | |
1541 | return BGP_ATTR_PARSE_ERROR; | |
1542 | ||
1543 | aspath_unintern(&attr->aspath); | |
1544 | attr->aspath = aspath_intern(newpath); | |
1545 | } | |
1546 | return BGP_ATTR_PARSE_PROCEED; | |
1547 | } | |
1548 | ||
1549 | /* Community attribute. */ | |
1550 | static bgp_attr_parse_ret_t | |
1551 | bgp_attr_community(struct bgp_attr_parser_args *args) | |
1552 | { | |
1553 | struct peer *const peer = args->peer; | |
1554 | struct attr *const attr = args->attr; | |
1555 | const bgp_size_t length = args->length; | |
1556 | ||
1557 | if (length == 0) { | |
1558 | attr->community = NULL; | |
1559 | return BGP_ATTR_PARSE_PROCEED; | |
1560 | } | |
1561 | ||
1562 | attr->community = | |
1563 | community_parse((uint32_t *)stream_pnt(peer->curr), length); | |
1564 | ||
1565 | /* XXX: fix community_parse to use stream API and remove this */ | |
1566 | stream_forward_getp(peer->curr, length); | |
1567 | ||
1568 | if (!attr->community) | |
1569 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1570 | args->total); | |
1571 | ||
1572 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1573 | ||
1574 | return BGP_ATTR_PARSE_PROCEED; | |
1575 | } | |
1576 | ||
1577 | /* Originator ID attribute. */ | |
1578 | static bgp_attr_parse_ret_t | |
1579 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) | |
1580 | { | |
1581 | struct peer *const peer = args->peer; | |
1582 | struct attr *const attr = args->attr; | |
1583 | const bgp_size_t length = args->length; | |
1584 | ||
1585 | /* Length check. */ | |
1586 | if (length != 4) { | |
1587 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", | |
1588 | length); | |
1589 | ||
1590 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1591 | args->total); | |
1592 | } | |
1593 | ||
1594 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); | |
1595 | ||
1596 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); | |
1597 | ||
1598 | return BGP_ATTR_PARSE_PROCEED; | |
1599 | } | |
1600 | ||
1601 | /* Cluster list attribute. */ | |
1602 | static bgp_attr_parse_ret_t | |
1603 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) | |
1604 | { | |
1605 | struct peer *const peer = args->peer; | |
1606 | struct attr *const attr = args->attr; | |
1607 | const bgp_size_t length = args->length; | |
1608 | ||
1609 | /* Check length. */ | |
1610 | if (length % 4) { | |
1611 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); | |
1612 | ||
1613 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1614 | args->total); | |
1615 | } | |
1616 | ||
1617 | attr->cluster = | |
1618 | cluster_parse((struct in_addr *)stream_pnt(peer->curr), length); | |
1619 | ||
1620 | /* XXX: Fix cluster_parse to use stream API and then remove this */ | |
1621 | stream_forward_getp(peer->curr, length); | |
1622 | ||
1623 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); | |
1624 | ||
1625 | return BGP_ATTR_PARSE_PROCEED; | |
1626 | } | |
1627 | ||
1628 | /* Multiprotocol reachability information parse. */ | |
1629 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, | |
1630 | struct bgp_nlri *mp_update) | |
1631 | { | |
1632 | iana_afi_t pkt_afi; | |
1633 | afi_t afi; | |
1634 | iana_safi_t pkt_safi; | |
1635 | safi_t safi; | |
1636 | bgp_size_t nlri_len; | |
1637 | size_t start; | |
1638 | struct stream *s; | |
1639 | struct peer *const peer = args->peer; | |
1640 | struct attr *const attr = args->attr; | |
1641 | const bgp_size_t length = args->length; | |
1642 | ||
1643 | /* Set end of packet. */ | |
1644 | s = BGP_INPUT(peer); | |
1645 | start = stream_get_getp(s); | |
1646 | ||
1647 | /* safe to read statically sized header? */ | |
1648 | #define BGP_MP_REACH_MIN_SIZE 5 | |
1649 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) | |
1650 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { | |
1651 | zlog_info("%s: %s sent invalid length, %lu", __func__, | |
1652 | peer->host, (unsigned long)length); | |
1653 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1654 | } | |
1655 | ||
1656 | /* Load AFI, SAFI. */ | |
1657 | pkt_afi = stream_getw(s); | |
1658 | pkt_safi = stream_getc(s); | |
1659 | ||
1660 | /* Convert AFI, SAFI to internal values, check. */ | |
1661 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1662 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1663 | * unless | |
1664 | * the attribute is otherwise malformed. | |
1665 | */ | |
1666 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1667 | zlog_debug( | |
1668 | "%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1669 | peer->host, pkt_afi, pkt_safi); | |
1670 | return BGP_ATTR_PARSE_ERROR; | |
1671 | } | |
1672 | ||
1673 | /* Get nexthop length. */ | |
1674 | attr->mp_nexthop_len = stream_getc(s); | |
1675 | ||
1676 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1677 | zlog_info( | |
1678 | "%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1679 | __func__, peer->host, attr->mp_nexthop_len); | |
1680 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1681 | } | |
1682 | ||
1683 | /* Nexthop length check. */ | |
1684 | switch (attr->mp_nexthop_len) { | |
1685 | case 0: | |
1686 | if (safi != SAFI_FLOWSPEC) { | |
1687 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1688 | __func__, peer->host, attr->mp_nexthop_len); | |
1689 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1690 | } | |
1691 | break; | |
1692 | case BGP_ATTR_NHLEN_VPNV4: | |
1693 | stream_getl(s); /* RD high */ | |
1694 | stream_getl(s); /* RD low */ | |
1695 | /* | |
1696 | * NOTE: intentional fall through | |
1697 | * - for consistency in rx processing | |
1698 | * | |
1699 | * The following comment is to signal GCC this intention | |
1700 | * and suppress the warning | |
1701 | */ | |
1702 | /* FALLTHRU */ | |
1703 | case BGP_ATTR_NHLEN_IPV4: | |
1704 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1705 | /* Probably needed for RFC 2283 */ | |
1706 | if (attr->nexthop.s_addr == 0) | |
1707 | memcpy(&attr->nexthop.s_addr, | |
1708 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
1709 | break; | |
1710 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: | |
1711 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
1712 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
1713 | stream_getl(s); /* RD high */ | |
1714 | stream_getl(s); /* RD low */ | |
1715 | } | |
1716 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1717 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { | |
1718 | if (!peer->nexthop.ifp) { | |
1719 | zlog_warn("%s: interface not set appropriately to handle some attributes", | |
1720 | peer->host); | |
1721 | return BGP_ATTR_PARSE_WITHDRAW; | |
1722 | } | |
1723 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; | |
1724 | } | |
1725 | break; | |
1726 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
1727 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
1728 | if (attr->mp_nexthop_len | |
1729 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1730 | stream_getl(s); /* RD high */ | |
1731 | stream_getl(s); /* RD low */ | |
1732 | } | |
1733 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1734 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { | |
1735 | if (!peer->nexthop.ifp) { | |
1736 | zlog_warn("%s: interface not set appropriately to handle some attributes", | |
1737 | peer->host); | |
1738 | return BGP_ATTR_PARSE_WITHDRAW; | |
1739 | } | |
1740 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; | |
1741 | } | |
1742 | if (attr->mp_nexthop_len | |
1743 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1744 | stream_getl(s); /* RD high */ | |
1745 | stream_getl(s); /* RD low */ | |
1746 | } | |
1747 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
1748 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
1749 | char buf1[INET6_ADDRSTRLEN]; | |
1750 | char buf2[INET6_ADDRSTRLEN]; | |
1751 | ||
1752 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1753 | zlog_debug( | |
1754 | "%s rcvd nexthops %s, %s -- ignoring non-LL value", | |
1755 | peer->host, | |
1756 | inet_ntop(AF_INET6, | |
1757 | &attr->mp_nexthop_global, | |
1758 | buf1, INET6_ADDRSTRLEN), | |
1759 | inet_ntop(AF_INET6, | |
1760 | &attr->mp_nexthop_local, buf2, | |
1761 | INET6_ADDRSTRLEN)); | |
1762 | ||
1763 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
1764 | } | |
1765 | if (!peer->nexthop.ifp) { | |
1766 | zlog_warn("%s: Interface not set appropriately to handle this some attributes", | |
1767 | peer->host); | |
1768 | return BGP_ATTR_PARSE_WITHDRAW; | |
1769 | } | |
1770 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; | |
1771 | break; | |
1772 | default: | |
1773 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1774 | __func__, peer->host, attr->mp_nexthop_len); | |
1775 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1776 | } | |
1777 | ||
1778 | if (!LEN_LEFT) { | |
1779 | zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__, | |
1780 | peer->host); | |
1781 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1782 | } | |
1783 | ||
1784 | { | |
1785 | uint8_t val; | |
1786 | if ((val = stream_getc(s))) | |
1787 | flog_warn( | |
1788 | EC_BGP_DEFUNCT_SNPA_LEN, | |
1789 | "%s sent non-zero value, %u, for defunct SNPA-length field", | |
1790 | peer->host, val); | |
1791 | } | |
1792 | ||
1793 | /* must have nrli_len, what is left of the attribute */ | |
1794 | nlri_len = LEN_LEFT; | |
1795 | if (nlri_len > STREAM_READABLE(s)) { | |
1796 | zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host); | |
1797 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1798 | } | |
1799 | ||
1800 | if (!nlri_len) { | |
1801 | zlog_info("%s: (%s) No Reachability, Treating as a EOR marker", | |
1802 | __func__, peer->host); | |
1803 | ||
1804 | mp_update->afi = afi; | |
1805 | mp_update->safi = safi; | |
1806 | return BGP_ATTR_PARSE_EOR; | |
1807 | } | |
1808 | ||
1809 | mp_update->afi = afi; | |
1810 | mp_update->safi = safi; | |
1811 | mp_update->nlri = stream_pnt(s); | |
1812 | mp_update->length = nlri_len; | |
1813 | ||
1814 | stream_forward_getp(s, nlri_len); | |
1815 | ||
1816 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
1817 | ||
1818 | return BGP_ATTR_PARSE_PROCEED; | |
1819 | #undef LEN_LEFT | |
1820 | } | |
1821 | ||
1822 | /* Multiprotocol unreachable parse */ | |
1823 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, | |
1824 | struct bgp_nlri *mp_withdraw) | |
1825 | { | |
1826 | struct stream *s; | |
1827 | iana_afi_t pkt_afi; | |
1828 | afi_t afi; | |
1829 | iana_safi_t pkt_safi; | |
1830 | safi_t safi; | |
1831 | uint16_t withdraw_len; | |
1832 | struct peer *const peer = args->peer; | |
1833 | struct attr *const attr = args->attr; | |
1834 | const bgp_size_t length = args->length; | |
1835 | ||
1836 | s = peer->curr; | |
1837 | ||
1838 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
1839 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1840 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1841 | ||
1842 | pkt_afi = stream_getw(s); | |
1843 | pkt_safi = stream_getc(s); | |
1844 | ||
1845 | /* Convert AFI, SAFI to internal values, check. */ | |
1846 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1847 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1848 | * unless | |
1849 | * the attribute is otherwise malformed. | |
1850 | */ | |
1851 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1852 | zlog_debug( | |
1853 | "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
1854 | peer->host, pkt_afi, pkt_safi); | |
1855 | return BGP_ATTR_PARSE_ERROR; | |
1856 | } | |
1857 | ||
1858 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; | |
1859 | ||
1860 | mp_withdraw->afi = afi; | |
1861 | mp_withdraw->safi = safi; | |
1862 | mp_withdraw->nlri = stream_pnt(s); | |
1863 | mp_withdraw->length = withdraw_len; | |
1864 | ||
1865 | stream_forward_getp(s, withdraw_len); | |
1866 | ||
1867 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); | |
1868 | ||
1869 | return BGP_ATTR_PARSE_PROCEED; | |
1870 | } | |
1871 | ||
1872 | /* Large Community attribute. */ | |
1873 | static bgp_attr_parse_ret_t | |
1874 | bgp_attr_large_community(struct bgp_attr_parser_args *args) | |
1875 | { | |
1876 | struct peer *const peer = args->peer; | |
1877 | struct attr *const attr = args->attr; | |
1878 | const bgp_size_t length = args->length; | |
1879 | ||
1880 | /* | |
1881 | * Large community follows new attribute format. | |
1882 | */ | |
1883 | if (length == 0) { | |
1884 | attr->lcommunity = NULL; | |
1885 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1886 | return BGP_ATTR_PARSE_PROCEED; | |
1887 | } | |
1888 | ||
1889 | attr->lcommunity = | |
1890 | lcommunity_parse((uint8_t *)stream_pnt(peer->curr), length); | |
1891 | /* XXX: fix ecommunity_parse to use stream API */ | |
1892 | stream_forward_getp(peer->curr, length); | |
1893 | ||
1894 | if (!attr->lcommunity) | |
1895 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1896 | args->total); | |
1897 | ||
1898 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
1899 | ||
1900 | return BGP_ATTR_PARSE_PROCEED; | |
1901 | } | |
1902 | ||
1903 | /* Extended Community attribute. */ | |
1904 | static bgp_attr_parse_ret_t | |
1905 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) | |
1906 | { | |
1907 | struct peer *const peer = args->peer; | |
1908 | struct attr *const attr = args->attr; | |
1909 | const bgp_size_t length = args->length; | |
1910 | uint8_t sticky = 0; | |
1911 | ||
1912 | if (length == 0) { | |
1913 | attr->ecommunity = NULL; | |
1914 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1915 | return BGP_ATTR_PARSE_PROCEED; | |
1916 | } | |
1917 | ||
1918 | attr->ecommunity = | |
1919 | ecommunity_parse((uint8_t *)stream_pnt(peer->curr), length); | |
1920 | /* XXX: fix ecommunity_parse to use stream API */ | |
1921 | stream_forward_getp(peer->curr, length); | |
1922 | ||
1923 | if (!attr->ecommunity) | |
1924 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1925 | args->total); | |
1926 | ||
1927 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1928 | ||
1929 | /* Extract MAC mobility sequence number, if any. */ | |
1930 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
1931 | attr->sticky = sticky; | |
1932 | ||
1933 | /* Check if this is a Gateway MAC-IP advertisement */ | |
1934 | attr->default_gw = bgp_attr_default_gw(attr); | |
1935 | ||
1936 | /* Handle scenario where router flag ecommunity is not | |
1937 | * set but default gw ext community is present. | |
1938 | * Use default gateway, set and propogate R-bit. | |
1939 | */ | |
1940 | if (attr->default_gw) | |
1941 | attr->router_flag = 1; | |
1942 | ||
1943 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
1944 | bgp_attr_evpn_na_flag(attr, &attr->router_flag); | |
1945 | ||
1946 | /* Extract the Rmac, if any */ | |
1947 | bgp_attr_rmac(attr, &attr->rmac); | |
1948 | ||
1949 | return BGP_ATTR_PARSE_PROCEED; | |
1950 | } | |
1951 | ||
1952 | /* Parse Tunnel Encap attribute in an UPDATE */ | |
1953 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ | |
1954 | bgp_size_t length, /* IN: attr's length field */ | |
1955 | struct attr *attr, /* IN: caller already allocated */ | |
1956 | uint8_t flag, /* IN: attr's flags field */ | |
1957 | uint8_t *startp) | |
1958 | { | |
1959 | bgp_size_t total; | |
1960 | uint16_t tunneltype = 0; | |
1961 | ||
1962 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1963 | ||
1964 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
1965 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
1966 | zlog_info( | |
1967 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
1968 | flag); | |
1969 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1970 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1971 | startp, total); | |
1972 | return -1; | |
1973 | } | |
1974 | ||
1975 | if (BGP_ATTR_ENCAP == type) { | |
1976 | /* read outer TLV type and length */ | |
1977 | uint16_t tlv_length; | |
1978 | ||
1979 | if (length < 4) { | |
1980 | zlog_info( | |
1981 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
1982 | bgp_notify_send_with_data( | |
1983 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1984 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1985 | return -1; | |
1986 | } | |
1987 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
1988 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
1989 | length -= 4; | |
1990 | ||
1991 | if (tlv_length != length) { | |
1992 | zlog_info("%s: tlv_length(%d) != length(%d)", __func__, | |
1993 | tlv_length, length); | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | while (length >= 4) { | |
1998 | uint16_t subtype = 0; | |
1999 | uint16_t sublength = 0; | |
2000 | struct bgp_attr_encap_subtlv *tlv; | |
2001 | ||
2002 | if (BGP_ATTR_ENCAP == type) { | |
2003 | subtype = stream_getc(BGP_INPUT(peer)); | |
2004 | sublength = stream_getc(BGP_INPUT(peer)); | |
2005 | length -= 2; | |
2006 | #if ENABLE_BGP_VNC | |
2007 | } else { | |
2008 | subtype = stream_getw(BGP_INPUT(peer)); | |
2009 | sublength = stream_getw(BGP_INPUT(peer)); | |
2010 | length -= 4; | |
2011 | #endif | |
2012 | } | |
2013 | ||
2014 | if (sublength > length) { | |
2015 | zlog_info( | |
2016 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2017 | sublength, length); | |
2018 | bgp_notify_send_with_data( | |
2019 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2020 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2021 | return -1; | |
2022 | } | |
2023 | ||
2024 | /* alloc and copy sub-tlv */ | |
2025 | /* TBD make sure these are freed when attributes are released */ | |
2026 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
2027 | sizeof(struct bgp_attr_encap_subtlv) + sublength); | |
2028 | tlv->type = subtype; | |
2029 | tlv->length = sublength; | |
2030 | stream_get(tlv->value, peer->curr, sublength); | |
2031 | length -= sublength; | |
2032 | ||
2033 | /* attach tlv to encap chain */ | |
2034 | if (BGP_ATTR_ENCAP == type) { | |
2035 | struct bgp_attr_encap_subtlv *stlv_last; | |
2036 | for (stlv_last = attr->encap_subtlvs; | |
2037 | stlv_last && stlv_last->next; | |
2038 | stlv_last = stlv_last->next) | |
2039 | ; | |
2040 | if (stlv_last) { | |
2041 | stlv_last->next = tlv; | |
2042 | } else { | |
2043 | attr->encap_subtlvs = tlv; | |
2044 | } | |
2045 | #if ENABLE_BGP_VNC | |
2046 | } else { | |
2047 | struct bgp_attr_encap_subtlv *stlv_last; | |
2048 | for (stlv_last = attr->vnc_subtlvs; | |
2049 | stlv_last && stlv_last->next; | |
2050 | stlv_last = stlv_last->next) | |
2051 | ; | |
2052 | if (stlv_last) { | |
2053 | stlv_last->next = tlv; | |
2054 | } else { | |
2055 | attr->vnc_subtlvs = tlv; | |
2056 | } | |
2057 | #endif | |
2058 | } | |
2059 | } | |
2060 | ||
2061 | if (BGP_ATTR_ENCAP == type) { | |
2062 | attr->encap_tunneltype = tunneltype; | |
2063 | } | |
2064 | ||
2065 | if (length) { | |
2066 | /* spurious leftover data */ | |
2067 | zlog_info( | |
2068 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2069 | length); | |
2070 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2071 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2072 | startp, total); | |
2073 | return -1; | |
2074 | } | |
2075 | ||
2076 | return 0; | |
2077 | } | |
2078 | ||
2079 | /* | |
2080 | * Read an individual SID value returning how much data we have read | |
2081 | * Returns 0 if there was an error that needs to be passed up the stack | |
2082 | */ | |
2083 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(int32_t type, | |
2084 | int32_t length, | |
2085 | struct bgp_attr_parser_args *args, | |
2086 | struct bgp_nlri *mp_update) | |
2087 | { | |
2088 | struct peer *const peer = args->peer; | |
2089 | struct attr *const attr = args->attr; | |
2090 | uint32_t label_index; | |
2091 | struct in6_addr ipv6_sid; | |
2092 | uint32_t srgb_base; | |
2093 | uint32_t srgb_range; | |
2094 | int srgb_count; | |
2095 | ||
2096 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { | |
2097 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2098 | flog_err( | |
2099 | EC_BGP_ATTR_LEN, | |
2100 | "Prefix SID label index length is %d instead of %d", | |
2101 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
2102 | return bgp_attr_malformed(args, | |
2103 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2104 | args->total); | |
2105 | } | |
2106 | ||
2107 | /* Ignore flags and reserved */ | |
2108 | stream_getc(peer->curr); | |
2109 | stream_getw(peer->curr); | |
2110 | ||
2111 | /* Fetch the label index and see if it is valid. */ | |
2112 | label_index = stream_getl(peer->curr); | |
2113 | if (label_index == BGP_INVALID_LABEL_INDEX) | |
2114 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2115 | args->total); | |
2116 | ||
2117 | /* Store label index; subsequently, we'll check on | |
2118 | * address-family */ | |
2119 | attr->label_index = label_index; | |
2120 | ||
2121 | /* | |
2122 | * Ignore the Label index attribute unless received for | |
2123 | * labeled-unicast | |
2124 | * SAFI. | |
2125 | */ | |
2126 | if (!mp_update->length | |
2127 | || mp_update->safi != SAFI_LABELED_UNICAST) | |
2128 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
2129 | } | |
2130 | ||
2131 | /* Placeholder code for the IPv6 SID type */ | |
2132 | else if (type == BGP_PREFIX_SID_IPV6) { | |
2133 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
2134 | flog_err(EC_BGP_ATTR_LEN, | |
2135 | "Prefix SID IPv6 length is %d instead of %d", | |
2136 | length, BGP_PREFIX_SID_IPV6_LENGTH); | |
2137 | return bgp_attr_malformed(args, | |
2138 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2139 | args->total); | |
2140 | } | |
2141 | ||
2142 | /* Ignore reserved */ | |
2143 | stream_getc(peer->curr); | |
2144 | stream_getw(peer->curr); | |
2145 | ||
2146 | stream_get(&ipv6_sid, peer->curr, 16); | |
2147 | } | |
2148 | ||
2149 | /* Placeholder code for the Originator SRGB type */ | |
2150 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
2151 | /* Ignore flags */ | |
2152 | stream_getw(peer->curr); | |
2153 | ||
2154 | length -= 2; | |
2155 | ||
2156 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { | |
2157 | flog_err( | |
2158 | EC_BGP_ATTR_LEN, | |
2159 | "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", | |
2160 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2161 | return bgp_attr_malformed( | |
2162 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2163 | args->total); | |
2164 | } | |
2165 | ||
2166 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2167 | ||
2168 | for (int i = 0; i < srgb_count; i++) { | |
2169 | stream_get(&srgb_base, peer->curr, 3); | |
2170 | stream_get(&srgb_range, peer->curr, 3); | |
2171 | } | |
2172 | } | |
2173 | ||
2174 | return BGP_ATTR_PARSE_PROCEED; | |
2175 | } | |
2176 | ||
2177 | /* Prefix SID attribute | |
2178 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2179 | */ | |
2180 | bgp_attr_parse_ret_t | |
2181 | bgp_attr_prefix_sid(int32_t tlength, struct bgp_attr_parser_args *args, | |
2182 | struct bgp_nlri *mp_update) | |
2183 | { | |
2184 | struct peer *const peer = args->peer; | |
2185 | struct attr *const attr = args->attr; | |
2186 | bgp_attr_parse_ret_t ret; | |
2187 | ||
2188 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2189 | ||
2190 | while (tlength) { | |
2191 | int32_t type, length; | |
2192 | ||
2193 | type = stream_getc(peer->curr); | |
2194 | length = stream_getw(peer->curr); | |
2195 | ||
2196 | ret = bgp_attr_psid_sub(type, length, args, mp_update); | |
2197 | ||
2198 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2199 | return ret; | |
2200 | /* | |
2201 | * Subtract length + the T and the L | |
2202 | * since length is the Vector portion | |
2203 | */ | |
2204 | tlength -= length + 3; | |
2205 | ||
2206 | if (tlength < 0) { | |
2207 | flog_err( | |
2208 | EC_BGP_ATTR_LEN, | |
2209 | "Prefix SID internal length %d causes us to read beyond the total Prefix SID length", | |
2210 | length); | |
2211 | return bgp_attr_malformed(args, | |
2212 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2213 | args->total); | |
2214 | } | |
2215 | } | |
2216 | ||
2217 | return BGP_ATTR_PARSE_PROCEED; | |
2218 | } | |
2219 | ||
2220 | /* PMSI tunnel attribute (RFC 6514) | |
2221 | * Basic validation checks done here. | |
2222 | */ | |
2223 | static bgp_attr_parse_ret_t | |
2224 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2225 | { | |
2226 | struct peer *const peer = args->peer; | |
2227 | struct attr *const attr = args->attr; | |
2228 | const bgp_size_t length = args->length; | |
2229 | uint8_t tnl_type; | |
2230 | ||
2231 | /* Verify that the receiver is expecting "ingress replication" as we | |
2232 | * can only support that. | |
2233 | */ | |
2234 | if (length < 2) { | |
2235 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", | |
2236 | length); | |
2237 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2238 | args->total); | |
2239 | } | |
2240 | stream_getc(peer->curr); /* Flags */ | |
2241 | tnl_type = stream_getc(peer->curr); | |
2242 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
2243 | flog_err(EC_BGP_ATTR_PMSI_TYPE, | |
2244 | "Invalid PMSI tunnel attribute type %d", tnl_type); | |
2245 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2246 | args->total); | |
2247 | } | |
2248 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2249 | if (length != 9) { | |
2250 | flog_err(EC_BGP_ATTR_PMSI_LEN, | |
2251 | "Bad PMSI tunnel attribute length %d for IR", | |
2252 | length); | |
2253 | return bgp_attr_malformed( | |
2254 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2255 | args->total); | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2260 | attr->pmsi_tnl_type = tnl_type; | |
2261 | ||
2262 | /* Forward read pointer of input stream. */ | |
2263 | stream_forward_getp(peer->curr, length - 2); | |
2264 | ||
2265 | return BGP_ATTR_PARSE_PROCEED; | |
2266 | } | |
2267 | ||
2268 | /* BGP unknown attribute treatment. */ | |
2269 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) | |
2270 | { | |
2271 | bgp_size_t total = args->total; | |
2272 | struct transit *transit; | |
2273 | struct peer *const peer = args->peer; | |
2274 | struct attr *const attr = args->attr; | |
2275 | uint8_t *const startp = args->startp; | |
2276 | const uint8_t type = args->type; | |
2277 | const uint8_t flag = args->flags; | |
2278 | const bgp_size_t length = args->length; | |
2279 | ||
2280 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2281 | zlog_debug( | |
2282 | "%s Unknown attribute is received (type %d, length %d)", | |
2283 | peer->host, type, length); | |
2284 | ||
2285 | /* Forward read pointer of input stream. */ | |
2286 | stream_forward_getp(peer->curr, length); | |
2287 | ||
2288 | /* If any of the mandatory well-known attributes are not recognized, | |
2289 | then the Error Subcode is set to Unrecognized Well-known | |
2290 | Attribute. The Data field contains the unrecognized attribute | |
2291 | (type, length and value). */ | |
2292 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2293 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2294 | args->total); | |
2295 | } | |
2296 | ||
2297 | /* Unrecognized non-transitive optional attributes must be quietly | |
2298 | ignored and not passed along to other BGP peers. */ | |
2299 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2300 | return BGP_ATTR_PARSE_PROCEED; | |
2301 | ||
2302 | /* If a path with recognized transitive optional attribute is | |
2303 | accepted and passed along to other BGP peers and the Partial bit | |
2304 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2305 | is not set back to 0 by the current AS. */ | |
2306 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2307 | ||
2308 | /* Store transitive attribute to the end of attr->transit. */ | |
2309 | if (!attr->transit) | |
2310 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2311 | ||
2312 | transit = attr->transit; | |
2313 | ||
2314 | if (transit->val) | |
2315 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2316 | transit->length + total); | |
2317 | else | |
2318 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2319 | ||
2320 | memcpy(transit->val + transit->length, startp, total); | |
2321 | transit->length += total; | |
2322 | ||
2323 | return BGP_ATTR_PARSE_PROCEED; | |
2324 | } | |
2325 | ||
2326 | /* Well-known attribute check. */ | |
2327 | static int bgp_attr_check(struct peer *peer, struct attr *attr) | |
2328 | { | |
2329 | uint8_t type = 0; | |
2330 | ||
2331 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2332 | * empty UPDATE. */ | |
2333 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2334 | return BGP_ATTR_PARSE_PROCEED; | |
2335 | ||
2336 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2337 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2338 | are present, it should. Check for any other attribute being present | |
2339 | instead. | |
2340 | */ | |
2341 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && | |
2342 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
2343 | return BGP_ATTR_PARSE_PROCEED; | |
2344 | ||
2345 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2346 | type = BGP_ATTR_ORIGIN; | |
2347 | ||
2348 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2349 | type = BGP_ATTR_AS_PATH; | |
2350 | ||
2351 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2352 | * and | |
2353 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2354 | */ | |
2355 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2356 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2357 | type = BGP_ATTR_NEXT_HOP; | |
2358 | ||
2359 | if (peer->sort == BGP_PEER_IBGP | |
2360 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2361 | type = BGP_ATTR_LOCAL_PREF; | |
2362 | ||
2363 | if (type) { | |
2364 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, | |
2365 | "%s Missing well-known attribute %s.", peer->host, | |
2366 | lookup_msg(attr_str, type, NULL)); | |
2367 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2368 | BGP_NOTIFY_UPDATE_MISS_ATTR, &type, | |
2369 | 1); | |
2370 | return BGP_ATTR_PARSE_ERROR; | |
2371 | } | |
2372 | return BGP_ATTR_PARSE_PROCEED; | |
2373 | } | |
2374 | ||
2375 | /* Read attribute of update packet. This function is called from | |
2376 | bgp_update_receive() in bgp_packet.c. */ | |
2377 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, | |
2378 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2379 | struct bgp_nlri *mp_withdraw) | |
2380 | { | |
2381 | bgp_attr_parse_ret_t ret; | |
2382 | uint8_t flag = 0; | |
2383 | uint8_t type = 0; | |
2384 | bgp_size_t length; | |
2385 | uint8_t *startp, *endp; | |
2386 | uint8_t *attr_endp; | |
2387 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
2388 | /* we need the as4_path only until we have synthesized the as_path with | |
2389 | * it */ | |
2390 | /* same goes for as4_aggregator */ | |
2391 | struct aspath *as4_path = NULL; | |
2392 | as_t as4_aggregator = 0; | |
2393 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2394 | ||
2395 | /* Initialize bitmap. */ | |
2396 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2397 | ||
2398 | /* End pointer of BGP attribute. */ | |
2399 | endp = BGP_INPUT_PNT(peer) + size; | |
2400 | ||
2401 | /* Get attributes to the end of attribute length. */ | |
2402 | while (BGP_INPUT_PNT(peer) < endp) { | |
2403 | /* Check remaining length check.*/ | |
2404 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2405 | /* XXX warning: long int format, int arg (arg 5) */ | |
2406 | flog_warn( | |
2407 | EC_BGP_ATTRIBUTE_TOO_SMALL, | |
2408 | "%s: error BGP attribute length %lu is smaller than min len", | |
2409 | peer->host, | |
2410 | (unsigned long)(endp | |
2411 | - stream_pnt(BGP_INPUT(peer)))); | |
2412 | ||
2413 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2414 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2415 | return BGP_ATTR_PARSE_ERROR; | |
2416 | } | |
2417 | ||
2418 | /* Fetch attribute flag and type. */ | |
2419 | startp = BGP_INPUT_PNT(peer); | |
2420 | /* "The lower-order four bits of the Attribute Flags octet are | |
2421 | unused. They MUST be zero when sent and MUST be ignored when | |
2422 | received." */ | |
2423 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2424 | type = stream_getc(BGP_INPUT(peer)); | |
2425 | ||
2426 | /* Check whether Extended-Length applies and is in bounds */ | |
2427 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2428 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
2429 | flog_warn( | |
2430 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, | |
2431 | "%s: Extended length set, but just %lu bytes of attr header", | |
2432 | peer->host, | |
2433 | (unsigned long)(endp | |
2434 | - stream_pnt(BGP_INPUT(peer)))); | |
2435 | ||
2436 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2437 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2438 | return BGP_ATTR_PARSE_ERROR; | |
2439 | } | |
2440 | ||
2441 | /* Check extended attribue length bit. */ | |
2442 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2443 | length = stream_getw(BGP_INPUT(peer)); | |
2444 | else | |
2445 | length = stream_getc(BGP_INPUT(peer)); | |
2446 | ||
2447 | /* If any attribute appears more than once in the UPDATE | |
2448 | message, then the Error Subcode is set to Malformed Attribute | |
2449 | List. */ | |
2450 | ||
2451 | if (CHECK_BITMAP(seen, type)) { | |
2452 | flog_warn( | |
2453 | EC_BGP_ATTRIBUTE_REPEATED, | |
2454 | "%s: error BGP attribute type %d appears twice in a message", | |
2455 | peer->host, type); | |
2456 | ||
2457 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2458 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2459 | return BGP_ATTR_PARSE_ERROR; | |
2460 | } | |
2461 | ||
2462 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2463 | unsigned char so it never overflow bitmap range. */ | |
2464 | ||
2465 | SET_BITMAP(seen, type); | |
2466 | ||
2467 | /* Overflow check. */ | |
2468 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
2469 | ||
2470 | if (attr_endp > endp) { | |
2471 | flog_warn( | |
2472 | EC_BGP_ATTRIBUTE_TOO_LARGE, | |
2473 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", | |
2474 | peer->host, type, length, size, attr_endp, | |
2475 | endp); | |
2476 | /* | |
2477 | * RFC 4271 6.3 | |
2478 | * If any recognized attribute has an Attribute | |
2479 | * Length that conflicts with the expected length | |
2480 | * (based on the attribute type code), then the | |
2481 | * Error Subcode MUST be set to Attribute Length | |
2482 | * Error. The Data field MUST contain the erroneous | |
2483 | * attribute (type, length, and value). | |
2484 | * ---------- | |
2485 | * We do not currently have a good way to determine the | |
2486 | * length of the attribute independent of the length | |
2487 | * received in the message. Instead we send the | |
2488 | * minimum between the amount of data we have and the | |
2489 | * amount specified by the attribute length field. | |
2490 | * | |
2491 | * Instead of directly passing in the packet buffer and | |
2492 | * offset we use the stream_get* functions to read into | |
2493 | * a stack buffer, since they perform bounds checking | |
2494 | * and we are working with untrusted data. | |
2495 | */ | |
2496 | unsigned char ndata[BGP_MAX_PACKET_SIZE]; | |
2497 | memset(ndata, 0x00, sizeof(ndata)); | |
2498 | size_t lfl = | |
2499 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
2500 | /* Rewind to end of flag field */ | |
2501 | stream_forward_getp(BGP_INPUT(peer), -(1 + lfl)); | |
2502 | /* Type */ | |
2503 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
2504 | /* Length */ | |
2505 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
2506 | /* Value */ | |
2507 | size_t atl = attr_endp - startp; | |
2508 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
2509 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
2510 | ||
2511 | bgp_notify_send_with_data( | |
2512 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2513 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, | |
2514 | ndl + lfl + 1); | |
2515 | ||
2516 | return BGP_ATTR_PARSE_ERROR; | |
2517 | } | |
2518 | ||
2519 | struct bgp_attr_parser_args attr_args = { | |
2520 | .peer = peer, | |
2521 | .length = length, | |
2522 | .attr = attr, | |
2523 | .type = type, | |
2524 | .flags = flag, | |
2525 | .startp = startp, | |
2526 | .total = attr_endp - startp, | |
2527 | }; | |
2528 | ||
2529 | ||
2530 | /* If any recognized attribute has Attribute Flags that conflict | |
2531 | with the Attribute Type Code, then the Error Subcode is set | |
2532 | to | |
2533 | Attribute Flags Error. The Data field contains the erroneous | |
2534 | attribute (type, length and value). */ | |
2535 | if (bgp_attr_flag_invalid(&attr_args)) { | |
2536 | ret = bgp_attr_malformed( | |
2537 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2538 | attr_args.total); | |
2539 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2540 | continue; | |
2541 | return ret; | |
2542 | } | |
2543 | ||
2544 | /* OK check attribute and store it's value. */ | |
2545 | switch (type) { | |
2546 | case BGP_ATTR_ORIGIN: | |
2547 | ret = bgp_attr_origin(&attr_args); | |
2548 | break; | |
2549 | case BGP_ATTR_AS_PATH: | |
2550 | ret = bgp_attr_aspath(&attr_args); | |
2551 | break; | |
2552 | case BGP_ATTR_AS4_PATH: | |
2553 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
2554 | break; | |
2555 | case BGP_ATTR_NEXT_HOP: | |
2556 | ret = bgp_attr_nexthop(&attr_args); | |
2557 | break; | |
2558 | case BGP_ATTR_MULTI_EXIT_DISC: | |
2559 | ret = bgp_attr_med(&attr_args); | |
2560 | break; | |
2561 | case BGP_ATTR_LOCAL_PREF: | |
2562 | ret = bgp_attr_local_pref(&attr_args); | |
2563 | break; | |
2564 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
2565 | ret = bgp_attr_atomic(&attr_args); | |
2566 | break; | |
2567 | case BGP_ATTR_AGGREGATOR: | |
2568 | ret = bgp_attr_aggregator(&attr_args); | |
2569 | break; | |
2570 | case BGP_ATTR_AS4_AGGREGATOR: | |
2571 | ret = bgp_attr_as4_aggregator(&attr_args, | |
2572 | &as4_aggregator, | |
2573 | &as4_aggregator_addr); | |
2574 | break; | |
2575 | case BGP_ATTR_COMMUNITIES: | |
2576 | ret = bgp_attr_community(&attr_args); | |
2577 | break; | |
2578 | case BGP_ATTR_LARGE_COMMUNITIES: | |
2579 | ret = bgp_attr_large_community(&attr_args); | |
2580 | break; | |
2581 | case BGP_ATTR_ORIGINATOR_ID: | |
2582 | ret = bgp_attr_originator_id(&attr_args); | |
2583 | break; | |
2584 | case BGP_ATTR_CLUSTER_LIST: | |
2585 | ret = bgp_attr_cluster_list(&attr_args); | |
2586 | break; | |
2587 | case BGP_ATTR_MP_REACH_NLRI: | |
2588 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
2589 | break; | |
2590 | case BGP_ATTR_MP_UNREACH_NLRI: | |
2591 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
2592 | break; | |
2593 | case BGP_ATTR_EXT_COMMUNITIES: | |
2594 | ret = bgp_attr_ext_communities(&attr_args); | |
2595 | break; | |
2596 | #if ENABLE_BGP_VNC | |
2597 | case BGP_ATTR_VNC: | |
2598 | #endif | |
2599 | case BGP_ATTR_ENCAP: | |
2600 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
2601 | startp); | |
2602 | break; | |
2603 | case BGP_ATTR_PREFIX_SID: | |
2604 | ret = bgp_attr_prefix_sid(length, | |
2605 | &attr_args, mp_update); | |
2606 | break; | |
2607 | case BGP_ATTR_PMSI_TUNNEL: | |
2608 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
2609 | break; | |
2610 | default: | |
2611 | ret = bgp_attr_unknown(&attr_args); | |
2612 | break; | |
2613 | } | |
2614 | ||
2615 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
2616 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2617 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2618 | ret = BGP_ATTR_PARSE_ERROR; | |
2619 | } | |
2620 | ||
2621 | if (ret == BGP_ATTR_PARSE_EOR) { | |
2622 | if (as4_path) | |
2623 | aspath_unintern(&as4_path); | |
2624 | return ret; | |
2625 | } | |
2626 | ||
2627 | /* If hard error occurred immediately return to the caller. */ | |
2628 | if (ret == BGP_ATTR_PARSE_ERROR) { | |
2629 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, | |
2630 | "%s: Attribute %s, parse error", peer->host, | |
2631 | lookup_msg(attr_str, type, NULL)); | |
2632 | if (as4_path) | |
2633 | aspath_unintern(&as4_path); | |
2634 | return ret; | |
2635 | } | |
2636 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
2637 | ||
2638 | flog_warn( | |
2639 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, | |
2640 | "%s: Attribute %s, parse error - treating as withdrawal", | |
2641 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2642 | if (as4_path) | |
2643 | aspath_unintern(&as4_path); | |
2644 | return ret; | |
2645 | } | |
2646 | ||
2647 | /* Check the fetched length. */ | |
2648 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
2649 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, | |
2650 | "%s: BGP attribute %s, fetch error", | |
2651 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2652 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2653 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2654 | if (as4_path) | |
2655 | aspath_unintern(&as4_path); | |
2656 | return BGP_ATTR_PARSE_ERROR; | |
2657 | } | |
2658 | } | |
2659 | ||
2660 | /* Check final read pointer is same as end pointer. */ | |
2661 | if (BGP_INPUT_PNT(peer) != endp) { | |
2662 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, | |
2663 | "%s: BGP attribute %s, length mismatch", peer->host, | |
2664 | lookup_msg(attr_str, type, NULL)); | |
2665 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2666 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2667 | if (as4_path) | |
2668 | aspath_unintern(&as4_path); | |
2669 | return BGP_ATTR_PARSE_ERROR; | |
2670 | } | |
2671 | ||
2672 | /* Check all mandatory well-known attributes are present */ | |
2673 | if ((ret = bgp_attr_check(peer, attr)) < 0) { | |
2674 | if (as4_path) | |
2675 | aspath_unintern(&as4_path); | |
2676 | return ret; | |
2677 | } | |
2678 | ||
2679 | /* | |
2680 | * At this place we can see whether we got AS4_PATH and/or | |
2681 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2682 | * We can not do this before we've read all attributes because | |
2683 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2684 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2685 | * in relationship to AGGREGATOR. | |
2686 | * So, to be defensive, we are not relying on any order and read | |
2687 | * all attributes first, including these 32bit ones, and now, | |
2688 | * afterwards, we look what and if something is to be done for as4. | |
2689 | * | |
2690 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2691 | * MP_UNREACH_NLRI. | |
2692 | */ | |
2693 | /* actually... this doesn't ever return failure currently, but | |
2694 | * better safe than sorry */ | |
2695 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
2696 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
2697 | &as4_aggregator_addr)) { | |
2698 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2699 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2700 | if (as4_path) | |
2701 | aspath_unintern(&as4_path); | |
2702 | return BGP_ATTR_PARSE_ERROR; | |
2703 | } | |
2704 | ||
2705 | /* At this stage, we have done all fiddling with as4, and the | |
2706 | * resulting info is in attr->aggregator resp. attr->aspath | |
2707 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2708 | * order to save memory | |
2709 | */ | |
2710 | if (as4_path) { | |
2711 | aspath_unintern(&as4_path); /* unintern - it is in the hash */ | |
2712 | /* The flag that we got this is still there, but that does not | |
2713 | * do any trouble | |
2714 | */ | |
2715 | } | |
2716 | /* | |
2717 | * The "rest" of the code does nothing with as4_aggregator. | |
2718 | * there is no memory attached specifically which is not part | |
2719 | * of the attr. | |
2720 | * so ignoring just means do nothing. | |
2721 | */ | |
2722 | /* | |
2723 | * Finally do the checks on the aspath we did not do yet | |
2724 | * because we waited for a potentially synthesized aspath. | |
2725 | */ | |
2726 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
2727 | ret = bgp_attr_aspath_check(peer, attr); | |
2728 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2729 | return ret; | |
2730 | } | |
2731 | /* Finally intern unknown attribute. */ | |
2732 | if (attr->transit) | |
2733 | attr->transit = transit_intern(attr->transit); | |
2734 | if (attr->encap_subtlvs) | |
2735 | attr->encap_subtlvs = | |
2736 | encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
2737 | #if ENABLE_BGP_VNC | |
2738 | if (attr->vnc_subtlvs) | |
2739 | attr->vnc_subtlvs = | |
2740 | encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
2741 | #endif | |
2742 | ||
2743 | return BGP_ATTR_PARSE_PROCEED; | |
2744 | } | |
2745 | ||
2746 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, | |
2747 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
2748 | struct attr *attr) | |
2749 | { | |
2750 | size_t sizep; | |
2751 | iana_afi_t pkt_afi; | |
2752 | iana_safi_t pkt_safi; | |
2753 | afi_t nh_afi; | |
2754 | ||
2755 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2756 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
2757 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
2758 | sizep = stream_get_endp(s); | |
2759 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
2760 | ||
2761 | ||
2762 | /* Convert AFI, SAFI to values for packet. */ | |
2763 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
2764 | ||
2765 | stream_putw(s, pkt_afi); /* AFI */ | |
2766 | stream_putc(s, pkt_safi); /* SAFI */ | |
2767 | ||
2768 | /* Nexthop AFI */ | |
2769 | if (afi == AFI_IP | |
2770 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST)) | |
2771 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; | |
2772 | else | |
2773 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
2774 | ||
2775 | /* Nexthop */ | |
2776 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2777 | switch (nh_afi) { | |
2778 | case AFI_IP: | |
2779 | switch (safi) { | |
2780 | case SAFI_UNICAST: | |
2781 | case SAFI_MULTICAST: | |
2782 | case SAFI_LABELED_UNICAST: | |
2783 | stream_putc(s, 4); | |
2784 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2785 | break; | |
2786 | case SAFI_MPLS_VPN: | |
2787 | stream_putc(s, 12); | |
2788 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2789 | stream_putl(s, 0); | |
2790 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2791 | break; | |
2792 | case SAFI_ENCAP: | |
2793 | case SAFI_EVPN: | |
2794 | stream_putc(s, 4); | |
2795 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2796 | break; | |
2797 | case SAFI_FLOWSPEC: | |
2798 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
2799 | default: | |
2800 | break; | |
2801 | } | |
2802 | break; | |
2803 | case AFI_IP6: | |
2804 | switch (safi) { | |
2805 | case SAFI_UNICAST: | |
2806 | case SAFI_MULTICAST: | |
2807 | case SAFI_LABELED_UNICAST: | |
2808 | case SAFI_EVPN: { | |
2809 | if (attr->mp_nexthop_len | |
2810 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2811 | stream_putc(s, | |
2812 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
2813 | stream_put(s, &attr->mp_nexthop_global, | |
2814 | IPV6_MAX_BYTELEN); | |
2815 | stream_put(s, &attr->mp_nexthop_local, | |
2816 | IPV6_MAX_BYTELEN); | |
2817 | } else { | |
2818 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2819 | stream_put(s, &attr->mp_nexthop_global, | |
2820 | IPV6_MAX_BYTELEN); | |
2821 | } | |
2822 | } break; | |
2823 | case SAFI_MPLS_VPN: { | |
2824 | if (attr->mp_nexthop_len | |
2825 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
2826 | stream_putc(s, 24); | |
2827 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2828 | stream_putl(s, 0); | |
2829 | stream_put(s, &attr->mp_nexthop_global, | |
2830 | IPV6_MAX_BYTELEN); | |
2831 | } else if (attr->mp_nexthop_len | |
2832 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2833 | stream_putc(s, 48); | |
2834 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2835 | stream_putl(s, 0); | |
2836 | stream_put(s, &attr->mp_nexthop_global, | |
2837 | IPV6_MAX_BYTELEN); | |
2838 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2839 | stream_putl(s, 0); | |
2840 | stream_put(s, &attr->mp_nexthop_local, | |
2841 | IPV6_MAX_BYTELEN); | |
2842 | } | |
2843 | } break; | |
2844 | case SAFI_ENCAP: | |
2845 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2846 | stream_put(s, &attr->mp_nexthop_global, | |
2847 | IPV6_MAX_BYTELEN); | |
2848 | break; | |
2849 | case SAFI_FLOWSPEC: | |
2850 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
2851 | default: | |
2852 | break; | |
2853 | } | |
2854 | break; | |
2855 | default: | |
2856 | if (safi != SAFI_FLOWSPEC) | |
2857 | flog_err( | |
2858 | EC_BGP_ATTR_NH_SEND_LEN, | |
2859 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", | |
2860 | peer->host, afi, safi, attr->mp_nexthop_len); | |
2861 | break; | |
2862 | } | |
2863 | ||
2864 | /* SNPA */ | |
2865 | stream_putc(s, 0); | |
2866 | return sizep; | |
2867 | } | |
2868 | ||
2869 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
2870 | struct prefix *p, struct prefix_rd *prd, | |
2871 | mpls_label_t *label, uint32_t num_labels, | |
2872 | int addpath_encode, uint32_t addpath_tx_id, | |
2873 | struct attr *attr) | |
2874 | { | |
2875 | if (safi == SAFI_MPLS_VPN) { | |
2876 | if (addpath_encode) | |
2877 | stream_putl(s, addpath_tx_id); | |
2878 | /* Label, RD, Prefix write. */ | |
2879 | stream_putc(s, p->prefixlen + 88); | |
2880 | stream_put(s, label, BGP_LABEL_BYTES); | |
2881 | stream_put(s, prd->val, 8); | |
2882 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
2883 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
2884 | /* EVPN prefix - contents depend on type */ | |
2885 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, | |
2886 | addpath_encode, addpath_tx_id); | |
2887 | } else if (safi == SAFI_LABELED_UNICAST) { | |
2888 | /* Prefix write with label. */ | |
2889 | stream_put_labeled_prefix(s, p, label); | |
2890 | } else if (safi == SAFI_FLOWSPEC) { | |
2891 | if (PSIZE (p->prefixlen)+2 < FLOWSPEC_NLRI_SIZELIMIT) | |
2892 | stream_putc(s, PSIZE (p->prefixlen)+2); | |
2893 | else | |
2894 | stream_putw(s, (PSIZE (p->prefixlen)+2)|(0xf<<12)); | |
2895 | stream_putc(s, 2);/* Filter type */ | |
2896 | stream_putc(s, p->prefixlen);/* Prefix length */ | |
2897 | stream_put(s, &p->u.prefix, PSIZE (p->prefixlen)); | |
2898 | } else | |
2899 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
2900 | } | |
2901 | ||
2902 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p) | |
2903 | { | |
2904 | int size = PSIZE(p->prefixlen); | |
2905 | if (safi == SAFI_MPLS_VPN) | |
2906 | size += 88; | |
2907 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) | |
2908 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
2909 | // type-5 | |
2910 | return size; | |
2911 | } | |
2912 | ||
2913 | /* | |
2914 | * Encodes the tunnel encapsulation attribute, | |
2915 | * and with ENABLE_BGP_VNC the VNC attribute which uses | |
2916 | * almost the same TLV format | |
2917 | */ | |
2918 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, | |
2919 | struct stream *s, struct attr *attr, | |
2920 | uint8_t attrtype) | |
2921 | { | |
2922 | unsigned int attrlenfield = 0; | |
2923 | unsigned int attrhdrlen = 0; | |
2924 | struct bgp_attr_encap_subtlv *subtlvs; | |
2925 | struct bgp_attr_encap_subtlv *st; | |
2926 | const char *attrname; | |
2927 | ||
2928 | if (!attr || (attrtype == BGP_ATTR_ENCAP | |
2929 | && (!attr->encap_tunneltype | |
2930 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
2931 | return; | |
2932 | ||
2933 | switch (attrtype) { | |
2934 | case BGP_ATTR_ENCAP: | |
2935 | attrname = "Tunnel Encap"; | |
2936 | subtlvs = attr->encap_subtlvs; | |
2937 | if (subtlvs == NULL) /* nothing to do */ | |
2938 | return; | |
2939 | /* | |
2940 | * The tunnel encap attr has an "outer" tlv. | |
2941 | * T = tunneltype, | |
2942 | * L = total length of subtlvs, | |
2943 | * V = concatenated subtlvs. | |
2944 | */ | |
2945 | attrlenfield = 2 + 2; /* T + L */ | |
2946 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
2947 | break; | |
2948 | ||
2949 | #if ENABLE_BGP_VNC | |
2950 | case BGP_ATTR_VNC: | |
2951 | attrname = "VNC"; | |
2952 | subtlvs = attr->vnc_subtlvs; | |
2953 | if (subtlvs == NULL) /* nothing to do */ | |
2954 | return; | |
2955 | attrlenfield = 0; /* no outer T + L */ | |
2956 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2957 | break; | |
2958 | #endif | |
2959 | ||
2960 | default: | |
2961 | assert(0); | |
2962 | } | |
2963 | ||
2964 | /* compute attr length */ | |
2965 | for (st = subtlvs; st; st = st->next) { | |
2966 | attrlenfield += (attrhdrlen + st->length); | |
2967 | } | |
2968 | ||
2969 | if (attrlenfield > 0xffff) { | |
2970 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
2971 | attrname, attrlenfield); | |
2972 | return; | |
2973 | } | |
2974 | ||
2975 | if (attrlenfield > 0xff) { | |
2976 | /* 2-octet length field */ | |
2977 | stream_putc(s, | |
2978 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
2979 | | BGP_ATTR_FLAG_EXTLEN); | |
2980 | stream_putc(s, attrtype); | |
2981 | stream_putw(s, attrlenfield & 0xffff); | |
2982 | } else { | |
2983 | /* 1-octet length field */ | |
2984 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
2985 | stream_putc(s, attrtype); | |
2986 | stream_putc(s, attrlenfield & 0xff); | |
2987 | } | |
2988 | ||
2989 | if (attrtype == BGP_ATTR_ENCAP) { | |
2990 | /* write outer T+L */ | |
2991 | stream_putw(s, attr->encap_tunneltype); | |
2992 | stream_putw(s, attrlenfield - 4); | |
2993 | } | |
2994 | ||
2995 | /* write each sub-tlv */ | |
2996 | for (st = subtlvs; st; st = st->next) { | |
2997 | if (attrtype == BGP_ATTR_ENCAP) { | |
2998 | stream_putc(s, st->type); | |
2999 | stream_putc(s, st->length); | |
3000 | #if ENABLE_BGP_VNC | |
3001 | } else { | |
3002 | stream_putw(s, st->type); | |
3003 | stream_putw(s, st->length); | |
3004 | #endif | |
3005 | } | |
3006 | stream_put(s, st->value, st->length); | |
3007 | } | |
3008 | } | |
3009 | ||
3010 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) | |
3011 | { | |
3012 | /* Set MP attribute length. Don't count the (2) bytes used to encode | |
3013 | the attr length */ | |
3014 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
3015 | } | |
3016 | ||
3017 | /* Make attribute packet. */ | |
3018 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, | |
3019 | struct stream *s, struct attr *attr, | |
3020 | struct bpacket_attr_vec_arr *vecarr, | |
3021 | struct prefix *p, afi_t afi, safi_t safi, | |
3022 | struct peer *from, struct prefix_rd *prd, | |
3023 | mpls_label_t *label, uint32_t num_labels, | |
3024 | int addpath_encode, uint32_t addpath_tx_id) | |
3025 | { | |
3026 | size_t cp; | |
3027 | size_t aspath_sizep; | |
3028 | struct aspath *aspath; | |
3029 | int send_as4_path = 0; | |
3030 | int send_as4_aggregator = 0; | |
3031 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
3032 | ||
3033 | if (!bgp) | |
3034 | bgp = peer->bgp; | |
3035 | ||
3036 | /* Remember current pointer. */ | |
3037 | cp = stream_get_endp(s); | |
3038 | ||
3039 | if (p | |
3040 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3041 | && !peer_cap_enhe(peer, afi, safi))) { | |
3042 | size_t mpattrlen_pos = 0; | |
3043 | ||
3044 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3045 | vecarr, attr); | |
3046 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, | |
3047 | num_labels, addpath_encode, | |
3048 | addpath_tx_id, attr); | |
3049 | bgp_packet_mpattr_end(s, mpattrlen_pos); | |
3050 | } | |
3051 | ||
3052 | /* Origin attribute. */ | |
3053 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3054 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3055 | stream_putc(s, 1); | |
3056 | stream_putc(s, attr->origin); | |
3057 | ||
3058 | /* AS path attribute. */ | |
3059 | ||
3060 | /* If remote-peer is EBGP */ | |
3061 | if (peer->sort == BGP_PEER_EBGP | |
3062 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3063 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3064 | || attr->aspath->segments == NULL) | |
3065 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3066 | PEER_FLAG_RSERVER_CLIENT))) { | |
3067 | aspath = aspath_dup(attr->aspath); | |
3068 | ||
3069 | /* Even though we may not be configured for confederations we | |
3070 | * may have | |
3071 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3072 | aspath = aspath_delete_confed_seq(aspath); | |
3073 | ||
3074 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3075 | /* Stuff our path CONFED_ID on the front */ | |
3076 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3077 | } else { | |
3078 | if (peer->change_local_as) { | |
3079 | /* If replace-as is specified, we only use the | |
3080 | change_local_as when | |
3081 | advertising routes. */ | |
3082 | if (!CHECK_FLAG( | |
3083 | peer->flags, | |
3084 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) { | |
3085 | aspath = aspath_add_seq(aspath, | |
3086 | peer->local_as); | |
3087 | } | |
3088 | aspath = aspath_add_seq(aspath, | |
3089 | peer->change_local_as); | |
3090 | } else { | |
3091 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3092 | } | |
3093 | } | |
3094 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3095 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3096 | * thing */ | |
3097 | aspath = aspath_dup(attr->aspath); | |
3098 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3099 | } else | |
3100 | aspath = attr->aspath; | |
3101 | ||
3102 | /* If peer is not AS4 capable, then: | |
3103 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3104 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3105 | * segment | |
3106 | * types are in it (i.e. exclude them if they are there) | |
3107 | * AND do this only if there is at least one asnum > 65535 in the | |
3108 | * path! | |
3109 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3110 | * change | |
3111 | * all ASnums > 65535 to BGP_AS_TRANS | |
3112 | */ | |
3113 | ||
3114 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3115 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3116 | aspath_sizep = stream_get_endp(s); | |
3117 | stream_putw(s, 0); | |
3118 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3119 | ||
3120 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3121 | * in the path | |
3122 | */ | |
3123 | if (!use32bit && aspath_has_as4(aspath)) | |
3124 | send_as4_path = | |
3125 | 1; /* we'll do this later, at the correct place */ | |
3126 | ||
3127 | /* Nexthop attribute. */ | |
3128 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3129 | && !peer_cap_enhe(peer, afi, safi)) { | |
3130 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { | |
3131 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3132 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3133 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3134 | attr); | |
3135 | stream_putc(s, 4); | |
3136 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3137 | } else if (peer_cap_enhe(from, afi, safi)) { | |
3138 | /* | |
3139 | * Likely this is the case when an IPv4 prefix was | |
3140 | * received with | |
3141 | * Extended Next-hop capability and now being advertised | |
3142 | * to | |
3143 | * non-ENHE peers. | |
3144 | * Setting the mandatory (ipv4) next-hop attribute here | |
3145 | * to enable | |
3146 | * implicit next-hop self with correct (ipv4 address | |
3147 | * family). | |
3148 | */ | |
3149 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3150 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3151 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3152 | NULL); | |
3153 | stream_putc(s, 4); | |
3154 | stream_put_ipv4(s, 0); | |
3155 | } | |
3156 | } | |
3157 | ||
3158 | /* MED attribute. */ | |
3159 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
3160 | || bgp->maxmed_active) { | |
3161 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3162 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3163 | stream_putc(s, 4); | |
3164 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
3165 | : attr->med)); | |
3166 | } | |
3167 | ||
3168 | /* Local preference. */ | |
3169 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
3170 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3171 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3172 | stream_putc(s, 4); | |
3173 | stream_putl(s, attr->local_pref); | |
3174 | } | |
3175 | ||
3176 | /* Atomic aggregate. */ | |
3177 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3178 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3179 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3180 | stream_putc(s, 0); | |
3181 | } | |
3182 | ||
3183 | /* Aggregator. */ | |
3184 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3185 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3186 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3187 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3188 | ||
3189 | if (use32bit) { | |
3190 | /* AS4 capable peer */ | |
3191 | stream_putc(s, 8); | |
3192 | stream_putl(s, attr->aggregator_as); | |
3193 | } else { | |
3194 | /* 2-byte AS peer */ | |
3195 | stream_putc(s, 6); | |
3196 | ||
3197 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3198 | * used? */ | |
3199 | if (attr->aggregator_as > 65535) { | |
3200 | stream_putw(s, BGP_AS_TRANS); | |
3201 | ||
3202 | /* we have to send AS4_AGGREGATOR, too. | |
3203 | * we'll do that later in order to send | |
3204 | * attributes in ascending | |
3205 | * order. | |
3206 | */ | |
3207 | send_as4_aggregator = 1; | |
3208 | } else | |
3209 | stream_putw(s, (uint16_t)attr->aggregator_as); | |
3210 | } | |
3211 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3212 | } | |
3213 | ||
3214 | /* Community attribute. */ | |
3215 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3216 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3217 | if (attr->community->size * 4 > 255) { | |
3218 | stream_putc(s, | |
3219 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3220 | | BGP_ATTR_FLAG_EXTLEN); | |
3221 | stream_putc(s, BGP_ATTR_COMMUNITIES); | |
3222 | stream_putw(s, attr->community->size * 4); | |
3223 | } else { | |
3224 | stream_putc(s, | |
3225 | BGP_ATTR_FLAG_OPTIONAL | |
3226 | | BGP_ATTR_FLAG_TRANS); | |
3227 | stream_putc(s, BGP_ATTR_COMMUNITIES); | |
3228 | stream_putc(s, attr->community->size * 4); | |
3229 | } | |
3230 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3231 | } | |
3232 | ||
3233 | /* | |
3234 | * Large Community attribute. | |
3235 | */ | |
3236 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3237 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3238 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
3239 | if (lcom_length(attr->lcommunity) > 255) { | |
3240 | stream_putc(s, | |
3241 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3242 | | BGP_ATTR_FLAG_EXTLEN); | |
3243 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); | |
3244 | stream_putw(s, lcom_length(attr->lcommunity)); | |
3245 | } else { | |
3246 | stream_putc(s, | |
3247 | BGP_ATTR_FLAG_OPTIONAL | |
3248 | | BGP_ATTR_FLAG_TRANS); | |
3249 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); | |
3250 | stream_putc(s, lcom_length(attr->lcommunity)); | |
3251 | } | |
3252 | stream_put(s, attr->lcommunity->val, | |
3253 | lcom_length(attr->lcommunity)); | |
3254 | } | |
3255 | ||
3256 | /* Route Reflector. */ | |
3257 | if (peer->sort == BGP_PEER_IBGP && from | |
3258 | && from->sort == BGP_PEER_IBGP) { | |
3259 | /* Originator ID. */ | |
3260 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3261 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3262 | stream_putc(s, 4); | |
3263 | ||
3264 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3265 | stream_put_in_addr(s, &attr->originator_id); | |
3266 | else | |
3267 | stream_put_in_addr(s, &from->remote_id); | |
3268 | ||
3269 | /* Cluster list. */ | |
3270 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3271 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3272 | ||
3273 | if (attr->cluster) { | |
3274 | stream_putc(s, attr->cluster->length + 4); | |
3275 | /* If this peer configuration's parent BGP has | |
3276 | * cluster_id. */ | |
3277 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3278 | stream_put_in_addr(s, &bgp->cluster_id); | |
3279 | else | |
3280 | stream_put_in_addr(s, &bgp->router_id); | |
3281 | stream_put(s, attr->cluster->list, | |
3282 | attr->cluster->length); | |
3283 | } else { | |
3284 | stream_putc(s, 4); | |
3285 | /* If this peer configuration's parent BGP has | |
3286 | * cluster_id. */ | |
3287 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3288 | stream_put_in_addr(s, &bgp->cluster_id); | |
3289 | else | |
3290 | stream_put_in_addr(s, &bgp->router_id); | |
3291 | } | |
3292 | } | |
3293 | ||
3294 | /* Extended Communities attribute. */ | |
3295 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3296 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3297 | if (peer->sort == BGP_PEER_IBGP | |
3298 | || peer->sort == BGP_PEER_CONFED) { | |
3299 | if (attr->ecommunity->size * 8 > 255) { | |
3300 | stream_putc(s, | |
3301 | BGP_ATTR_FLAG_OPTIONAL | |
3302 | | BGP_ATTR_FLAG_TRANS | |
3303 | | BGP_ATTR_FLAG_EXTLEN); | |
3304 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); | |
3305 | stream_putw(s, attr->ecommunity->size * 8); | |
3306 | } else { | |
3307 | stream_putc(s, | |
3308 | BGP_ATTR_FLAG_OPTIONAL | |
3309 | | BGP_ATTR_FLAG_TRANS); | |
3310 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); | |
3311 | stream_putc(s, attr->ecommunity->size * 8); | |
3312 | } | |
3313 | stream_put(s, attr->ecommunity->val, | |
3314 | attr->ecommunity->size * 8); | |
3315 | } else { | |
3316 | uint8_t *pnt; | |
3317 | int tbit; | |
3318 | int ecom_tr_size = 0; | |
3319 | int i; | |
3320 | ||
3321 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3322 | pnt = attr->ecommunity->val + (i * 8); | |
3323 | tbit = *pnt; | |
3324 | ||
3325 | if (CHECK_FLAG(tbit, | |
3326 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3327 | continue; | |
3328 | ||
3329 | ecom_tr_size++; | |
3330 | } | |
3331 | ||
3332 | if (ecom_tr_size) { | |
3333 | if (ecom_tr_size * 8 > 255) { | |
3334 | stream_putc( | |
3335 | s, | |
3336 | BGP_ATTR_FLAG_OPTIONAL | |
3337 | | BGP_ATTR_FLAG_TRANS | |
3338 | | BGP_ATTR_FLAG_EXTLEN); | |
3339 | stream_putc(s, | |
3340 | BGP_ATTR_EXT_COMMUNITIES); | |
3341 | stream_putw(s, ecom_tr_size * 8); | |
3342 | } else { | |
3343 | stream_putc( | |
3344 | s, | |
3345 | BGP_ATTR_FLAG_OPTIONAL | |
3346 | | BGP_ATTR_FLAG_TRANS); | |
3347 | stream_putc(s, | |
3348 | BGP_ATTR_EXT_COMMUNITIES); | |
3349 | stream_putc(s, ecom_tr_size * 8); | |
3350 | } | |
3351 | ||
3352 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3353 | pnt = attr->ecommunity->val + (i * 8); | |
3354 | tbit = *pnt; | |
3355 | ||
3356 | if (CHECK_FLAG( | |
3357 | tbit, | |
3358 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3359 | continue; | |
3360 | ||
3361 | stream_put(s, pnt, 8); | |
3362 | } | |
3363 | } | |
3364 | } | |
3365 | } | |
3366 | ||
3367 | /* Label index attribute. */ | |
3368 | if (safi == SAFI_LABELED_UNICAST) { | |
3369 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3370 | uint32_t label_index; | |
3371 | ||
3372 | label_index = attr->label_index; | |
3373 | ||
3374 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
3375 | stream_putc(s, | |
3376 | BGP_ATTR_FLAG_OPTIONAL | |
3377 | | BGP_ATTR_FLAG_TRANS); | |
3378 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
3379 | stream_putc(s, 10); | |
3380 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3381 | stream_putw(s, | |
3382 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3383 | stream_putc(s, 0); // reserved | |
3384 | stream_putw(s, 0); // flags | |
3385 | stream_putl(s, label_index); | |
3386 | } | |
3387 | } | |
3388 | } | |
3389 | ||
3390 | if (send_as4_path) { | |
3391 | /* If the peer is NOT As4 capable, AND */ | |
3392 | /* there are ASnums > 65535 in path THEN | |
3393 | * give out AS4_PATH */ | |
3394 | ||
3395 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3396 | * path segments! | |
3397 | * Hm, I wonder... confederation things *should* only be at | |
3398 | * the beginning of an aspath, right? Then we should use | |
3399 | * aspath_delete_confed_seq for this, because it is already | |
3400 | * there! (JK) | |
3401 | * Folks, talk to me: what is reasonable here!? | |
3402 | */ | |
3403 | aspath = aspath_delete_confed_seq(aspath); | |
3404 | ||
3405 | stream_putc(s, | |
3406 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3407 | | BGP_ATTR_FLAG_EXTLEN); | |
3408 | stream_putc(s, BGP_ATTR_AS4_PATH); | |
3409 | aspath_sizep = stream_get_endp(s); | |
3410 | stream_putw(s, 0); | |
3411 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
3412 | } | |
3413 | ||
3414 | if (aspath != attr->aspath) | |
3415 | aspath_free(aspath); | |
3416 | ||
3417 | if (send_as4_aggregator) { | |
3418 | /* send AS4_AGGREGATOR, at this place */ | |
3419 | /* this section of code moved here in order to ensure the | |
3420 | * correct | |
3421 | * *ascending* order of attributes | |
3422 | */ | |
3423 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3424 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
3425 | stream_putc(s, 8); | |
3426 | stream_putl(s, attr->aggregator_as); | |
3427 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3428 | } | |
3429 | ||
3430 | if (((afi == AFI_IP || afi == AFI_IP6) | |
3431 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3432 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
3433 | /* Tunnel Encap attribute */ | |
3434 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
3435 | ||
3436 | #if ENABLE_BGP_VNC | |
3437 | /* VNC attribute */ | |
3438 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
3439 | #endif | |
3440 | } | |
3441 | ||
3442 | /* PMSI Tunnel */ | |
3443 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
3444 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3445 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
3446 | stream_putc(s, 9); // Length | |
3447 | stream_putc(s, 0); // Flags | |
3448 | stream_putc(s, PMSI_TNLTYPE_INGR_REPL); // IR (6) | |
3449 | stream_put(s, &(attr->label), | |
3450 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
3451 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3452 | // Unicast tunnel endpoint IP address | |
3453 | } | |
3454 | ||
3455 | /* Unknown transit attribute. */ | |
3456 | if (attr->transit) | |
3457 | stream_put(s, attr->transit->val, attr->transit->length); | |
3458 | ||
3459 | /* Return total size of attribute. */ | |
3460 | return stream_get_endp(s) - cp; | |
3461 | } | |
3462 | ||
3463 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) | |
3464 | { | |
3465 | unsigned long attrlen_pnt; | |
3466 | iana_afi_t pkt_afi; | |
3467 | iana_safi_t pkt_safi; | |
3468 | ||
3469 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3470 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3471 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
3472 | ||
3473 | attrlen_pnt = stream_get_endp(s); | |
3474 | stream_putw(s, 0); /* Length of this attribute. */ | |
3475 | ||
3476 | /* Convert AFI, SAFI to values for packet. */ | |
3477 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3478 | ||
3479 | stream_putw(s, pkt_afi); | |
3480 | stream_putc(s, pkt_safi); | |
3481 | ||
3482 | return attrlen_pnt; | |
3483 | } | |
3484 | ||
3485 | void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi, | |
3486 | safi_t safi, struct prefix_rd *prd, | |
3487 | mpls_label_t *label, uint32_t num_labels, | |
3488 | int addpath_encode, uint32_t addpath_tx_id, | |
3489 | struct attr *attr) | |
3490 | { | |
3491 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; | |
3492 | ||
3493 | if (safi == SAFI_LABELED_UNICAST) { | |
3494 | label = (mpls_label_t *)wlabel; | |
3495 | num_labels = 1; | |
3496 | } | |
3497 | ||
3498 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, | |
3499 | addpath_encode, addpath_tx_id, attr); | |
3500 | } | |
3501 | ||
3502 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) | |
3503 | { | |
3504 | bgp_packet_mpattr_end(s, attrlen_pnt); | |
3505 | } | |
3506 | ||
3507 | /* Initialization of attribute. */ | |
3508 | void bgp_attr_init(void) | |
3509 | { | |
3510 | aspath_init(); | |
3511 | attrhash_init(); | |
3512 | community_init(); | |
3513 | ecommunity_init(); | |
3514 | lcommunity_init(); | |
3515 | cluster_init(); | |
3516 | transit_init(); | |
3517 | encap_init(); | |
3518 | } | |
3519 | ||
3520 | void bgp_attr_finish(void) | |
3521 | { | |
3522 | aspath_finish(); | |
3523 | attrhash_finish(); | |
3524 | community_finish(); | |
3525 | ecommunity_finish(); | |
3526 | lcommunity_finish(); | |
3527 | cluster_finish(); | |
3528 | transit_finish(); | |
3529 | encap_finish(); | |
3530 | } | |
3531 | ||
3532 | /* Make attribute packet. */ | |
3533 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, | |
3534 | struct prefix *prefix) | |
3535 | { | |
3536 | unsigned long cp; | |
3537 | unsigned long len; | |
3538 | size_t aspath_lenp; | |
3539 | struct aspath *aspath; | |
3540 | int addpath_encode = 0; | |
3541 | uint32_t addpath_tx_id = 0; | |
3542 | ||
3543 | /* Remember current pointer. */ | |
3544 | cp = stream_get_endp(s); | |
3545 | ||
3546 | /* Place holder of length. */ | |
3547 | stream_putw(s, 0); | |
3548 | ||
3549 | /* Origin attribute. */ | |
3550 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3551 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3552 | stream_putc(s, 1); | |
3553 | stream_putc(s, attr->origin); | |
3554 | ||
3555 | aspath = attr->aspath; | |
3556 | ||
3557 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3558 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3559 | aspath_lenp = stream_get_endp(s); | |
3560 | stream_putw(s, 0); | |
3561 | ||
3562 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
3563 | ||
3564 | /* Nexthop attribute. */ | |
3565 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
3566 | if (prefix != NULL && prefix->family != AF_INET6) { | |
3567 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3568 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3569 | stream_putc(s, 4); | |
3570 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3571 | } | |
3572 | ||
3573 | /* MED attribute. */ | |
3574 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
3575 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3576 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3577 | stream_putc(s, 4); | |
3578 | stream_putl(s, attr->med); | |
3579 | } | |
3580 | ||
3581 | /* Local preference. */ | |
3582 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
3583 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3584 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3585 | stream_putc(s, 4); | |
3586 | stream_putl(s, attr->local_pref); | |
3587 | } | |
3588 | ||
3589 | /* Atomic aggregate. */ | |
3590 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3591 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3592 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3593 | stream_putc(s, 0); | |
3594 | } | |
3595 | ||
3596 | /* Aggregator. */ | |
3597 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3598 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3599 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3600 | stream_putc(s, 8); | |
3601 | stream_putl(s, attr->aggregator_as); | |
3602 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3603 | } | |
3604 | ||
3605 | /* Community attribute. */ | |
3606 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
3607 | if (attr->community->size * 4 > 255) { | |
3608 | stream_putc(s, | |
3609 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3610 | | BGP_ATTR_FLAG_EXTLEN); | |
3611 | stream_putc(s, BGP_ATTR_COMMUNITIES); | |
3612 | stream_putw(s, attr->community->size * 4); | |
3613 | } else { | |
3614 | stream_putc(s, | |
3615 | BGP_ATTR_FLAG_OPTIONAL | |
3616 | | BGP_ATTR_FLAG_TRANS); | |
3617 | stream_putc(s, BGP_ATTR_COMMUNITIES); | |
3618 | stream_putc(s, attr->community->size * 4); | |
3619 | } | |
3620 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3621 | } | |
3622 | ||
3623 | /* Large Community attribute. */ | |
3624 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
3625 | if (lcom_length(attr->lcommunity) > 255) { | |
3626 | stream_putc(s, | |
3627 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3628 | | BGP_ATTR_FLAG_EXTLEN); | |
3629 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); | |
3630 | stream_putw(s, lcom_length(attr->lcommunity)); | |
3631 | } else { | |
3632 | stream_putc(s, | |
3633 | BGP_ATTR_FLAG_OPTIONAL | |
3634 | | BGP_ATTR_FLAG_TRANS); | |
3635 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); | |
3636 | stream_putc(s, lcom_length(attr->lcommunity)); | |
3637 | } | |
3638 | ||
3639 | stream_put(s, attr->lcommunity->val, | |
3640 | lcom_length(attr->lcommunity)); | |
3641 | } | |
3642 | ||
3643 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
3644 | if (prefix != NULL && prefix->family == AF_INET6 | |
3645 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
3646 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
3647 | int sizep; | |
3648 | ||
3649 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3650 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3651 | sizep = stream_get_endp(s); | |
3652 | ||
3653 | /* MP header */ | |
3654 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
3655 | stream_putw(s, AFI_IP6); /* AFI */ | |
3656 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3657 | ||
3658 | /* Next hop */ | |
3659 | stream_putc(s, attr->mp_nexthop_len); | |
3660 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3661 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3662 | stream_put(s, &attr->mp_nexthop_local, | |
3663 | IPV6_MAX_BYTELEN); | |
3664 | ||
3665 | /* SNPA */ | |
3666 | stream_putc(s, 0); | |
3667 | ||
3668 | /* Prefix */ | |
3669 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
3670 | addpath_tx_id); | |
3671 | ||
3672 | /* Set MP attribute length. */ | |
3673 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
3674 | } | |
3675 | ||
3676 | /* Prefix SID */ | |
3677 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3678 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
3679 | stream_putc(s, | |
3680 | BGP_ATTR_FLAG_OPTIONAL | |
3681 | | BGP_ATTR_FLAG_TRANS); | |
3682 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
3683 | stream_putc(s, 10); | |
3684 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3685 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3686 | stream_putc(s, 0); // reserved | |
3687 | stream_putw(s, 0); // flags | |
3688 | stream_putl(s, attr->label_index); | |
3689 | } | |
3690 | } | |
3691 | ||
3692 | /* Return total size of attribute. */ | |
3693 | len = stream_get_endp(s) - cp - 2; | |
3694 | stream_putw_at(s, cp, len); | |
3695 | } |