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718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
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 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
718e3744 | 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" | |
9bedbb1e | 42 | #include "bgpd/bgp_label.h" |
718e3744 | 43 | #include "bgpd/bgp_packet.h" |
44 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 45 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 46 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 47 | #include "bgpd/bgp_encap_types.h" |
65efcfce | 48 | #if ENABLE_BGP_VNC |
f8b6f499 | 49 | # include "bgpd/rfapi/bgp_rfapi_cfg.h" |
65efcfce LB |
50 | # include "bgp_encap_types.h" |
51 | # include "bgp_vnc_types.h" | |
52 | #endif | |
b18825eb PG |
53 | #include "bgp_encap_types.h" |
54 | #include "bgp_evpn.h" | |
6b0655a2 | 55 | |
718e3744 | 56 | /* Attribute strings for logging. */ |
9bddac4b | 57 | static const struct message attr_str [] = |
718e3744 | 58 | { |
59 | { BGP_ATTR_ORIGIN, "ORIGIN" }, | |
60 | { BGP_ATTR_AS_PATH, "AS_PATH" }, | |
61 | { BGP_ATTR_NEXT_HOP, "NEXT_HOP" }, | |
62 | { BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" }, | |
63 | { BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" }, | |
64 | { BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" }, | |
65 | { BGP_ATTR_AGGREGATOR, "AGGREGATOR" }, | |
66 | { BGP_ATTR_COMMUNITIES, "COMMUNITY" }, | |
67 | { BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" }, | |
f8627ff1 | 68 | { BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST" }, |
718e3744 | 69 | { BGP_ATTR_DPA, "DPA" }, |
70 | { BGP_ATTR_ADVERTISER, "ADVERTISER"} , | |
71 | { BGP_ATTR_RCID_PATH, "RCID_PATH" }, | |
72 | { BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" }, | |
73 | { BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" }, | |
0b2aa3a0 PJ |
74 | { BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" }, |
75 | { BGP_ATTR_AS4_PATH, "AS4_PATH" }, | |
76 | { BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" }, | |
77 | { BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" }, | |
f4c89855 | 78 | { BGP_ATTR_ENCAP, "ENCAP" }, |
65efcfce LB |
79 | #if ENABLE_BGP_VNC |
80 | { BGP_ATTR_VNC, "VNC" }, | |
81 | #endif | |
d39cdd93 | 82 | { BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY" }, |
56b40679 QY |
83 | { BGP_ATTR_PREFIX_SID, "PREFIX_SID" }, |
84 | { 0 } | |
718e3744 | 85 | }; |
afcb7679 DO |
86 | |
87 | static const struct message attr_flag_str[] = | |
88 | { | |
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 this list */ | |
93 | { BGP_ATTR_FLAG_EXTLEN, "Extended Length" }, | |
56b40679 | 94 | { 0 } |
afcb7679 | 95 | }; |
6b0655a2 | 96 | |
9bddac4b | 97 | static struct hash *cluster_hash; |
718e3744 | 98 | |
94f2b392 | 99 | static void * |
923de654 | 100 | cluster_hash_alloc (void *p) |
718e3744 | 101 | { |
ffd0c037 | 102 | const struct cluster_list *val = (const struct cluster_list *) p; |
718e3744 | 103 | struct cluster_list *cluster; |
104 | ||
105 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
106 | cluster->length = val->length; | |
107 | ||
108 | if (cluster->length) | |
109 | { | |
110 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
111 | memcpy (cluster->list, val->list, val->length); | |
112 | } | |
113 | else | |
114 | cluster->list = NULL; | |
115 | ||
116 | cluster->refcnt = 0; | |
117 | ||
118 | return cluster; | |
119 | } | |
120 | ||
121 | /* Cluster list related functions. */ | |
94f2b392 | 122 | static struct cluster_list * |
5228ad27 | 123 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 124 | { |
125 | struct cluster_list tmp; | |
126 | struct cluster_list *cluster; | |
127 | ||
128 | tmp.length = length; | |
5228ad27 | 129 | tmp.list = pnt; |
718e3744 | 130 | |
131 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
132 | cluster->refcnt++; | |
133 | return cluster; | |
134 | } | |
135 | ||
136 | int | |
137 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
138 | { | |
139 | int i; | |
140 | ||
141 | for (i = 0; i < cluster->length / 4; i++) | |
142 | if (cluster->list[i].s_addr == originator.s_addr) | |
143 | return 1; | |
144 | return 0; | |
145 | } | |
146 | ||
94f2b392 | 147 | static unsigned int |
923de654 | 148 | cluster_hash_key_make (void *p) |
718e3744 | 149 | { |
c8e7b895 | 150 | const struct cluster_list *cluster = p; |
718e3744 | 151 | |
c8e7b895 | 152 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 153 | } |
154 | ||
94f2b392 | 155 | static int |
ffe11cfb | 156 | cluster_hash_cmp (const void *p1, const void *p2) |
718e3744 | 157 | { |
ffe11cfb SH |
158 | const struct cluster_list * cluster1 = p1; |
159 | const struct cluster_list * cluster2 = p2; | |
923de654 | 160 | |
ffe11cfb SH |
161 | return (cluster1->length == cluster2->length && |
162 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 163 | } |
164 | ||
94f2b392 | 165 | static void |
718e3744 | 166 | cluster_free (struct cluster_list *cluster) |
167 | { | |
168 | if (cluster->list) | |
169 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
170 | XFREE (MTYPE_CLUSTER, cluster); | |
171 | } | |
172 | ||
94f2b392 | 173 | static struct cluster_list * |
718e3744 | 174 | cluster_dup (struct cluster_list *cluster) |
175 | { | |
176 | struct cluster_list *new; | |
177 | ||
393deb9b | 178 | new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); |
718e3744 | 179 | new->length = cluster->length; |
180 | ||
181 | if (cluster->length) | |
182 | { | |
183 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
184 | memcpy (new->list, cluster->list, cluster->length); | |
185 | } | |
186 | else | |
187 | new->list = NULL; | |
188 | ||
189 | return new; | |
190 | } | |
191 | ||
94f2b392 | 192 | static struct cluster_list * |
718e3744 | 193 | cluster_intern (struct cluster_list *cluster) |
194 | { | |
195 | struct cluster_list *find; | |
196 | ||
197 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
198 | find->refcnt++; | |
199 | ||
200 | return find; | |
201 | } | |
202 | ||
203 | void | |
204 | cluster_unintern (struct cluster_list *cluster) | |
205 | { | |
718e3744 | 206 | if (cluster->refcnt) |
207 | cluster->refcnt--; | |
208 | ||
209 | if (cluster->refcnt == 0) | |
210 | { | |
9206f9ec | 211 | hash_release (cluster_hash, cluster); |
718e3744 | 212 | cluster_free (cluster); |
213 | } | |
214 | } | |
215 | ||
94f2b392 | 216 | static void |
217 | cluster_init (void) | |
718e3744 | 218 | { |
dfd19ccc | 219 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp, NULL); |
718e3744 | 220 | } |
228da428 CC |
221 | |
222 | static void | |
223 | cluster_finish (void) | |
224 | { | |
289d2501 | 225 | hash_clean (cluster_hash, (void (*)(void *))cluster_free); |
228da428 CC |
226 | hash_free (cluster_hash); |
227 | cluster_hash = NULL; | |
228 | } | |
6b0655a2 | 229 | |
bede7744 LB |
230 | static struct hash *encap_hash = NULL; |
231 | #if ENABLE_BGP_VNC | |
232 | static struct hash *vnc_hash = NULL; | |
233 | #endif | |
234 | ||
f4c89855 LB |
235 | struct bgp_attr_encap_subtlv * |
236 | encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) | |
237 | { | |
238 | struct bgp_attr_encap_subtlv *new; | |
239 | struct bgp_attr_encap_subtlv *tail; | |
240 | struct bgp_attr_encap_subtlv *p; | |
241 | ||
242 | for (p = orig, tail = new = NULL; p; p = p->next) { | |
243 | int size = sizeof(struct bgp_attr_encap_subtlv) - 1 + p->length; | |
244 | if (tail) { | |
245 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
246 | tail = tail->next; | |
247 | } else { | |
248 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
249 | } | |
250 | assert(tail); | |
251 | memcpy(tail, p, size); | |
252 | tail->next = NULL; | |
253 | } | |
254 | ||
255 | return new; | |
256 | } | |
257 | ||
258 | static void | |
259 | encap_free(struct bgp_attr_encap_subtlv *p) | |
260 | { | |
261 | struct bgp_attr_encap_subtlv *next; | |
262 | while (p) { | |
263 | next = p->next; | |
264 | p->next = NULL; | |
265 | XFREE(MTYPE_ENCAP_TLV, p); | |
266 | p = next; | |
267 | } | |
268 | } | |
269 | ||
270 | void | |
271 | bgp_attr_flush_encap(struct attr *attr) | |
272 | { | |
aadc0905 | 273 | if (!attr) |
f4c89855 LB |
274 | return; |
275 | ||
aadc0905 DS |
276 | if (attr->encap_subtlvs) { |
277 | encap_free(attr->encap_subtlvs); | |
278 | attr->encap_subtlvs = NULL; | |
f4c89855 | 279 | } |
65efcfce | 280 | #if ENABLE_BGP_VNC |
aadc0905 DS |
281 | if (attr->vnc_subtlvs) { |
282 | encap_free(attr->vnc_subtlvs); | |
283 | attr->vnc_subtlvs = NULL; | |
65efcfce LB |
284 | } |
285 | #endif | |
f4c89855 LB |
286 | } |
287 | ||
288 | /* | |
289 | * Compare encap sub-tlv chains | |
290 | * | |
291 | * 1 = equivalent | |
292 | * 0 = not equivalent | |
293 | * | |
294 | * This algorithm could be made faster if needed | |
295 | */ | |
296 | static int | |
297 | encap_same(struct bgp_attr_encap_subtlv *h1, struct bgp_attr_encap_subtlv *h2) | |
298 | { | |
299 | struct bgp_attr_encap_subtlv *p; | |
300 | struct bgp_attr_encap_subtlv *q; | |
301 | ||
f4c89855 LB |
302 | if (h1 == h2) |
303 | return 1; | |
bede7744 LB |
304 | if (h1 == NULL || h2 == NULL) |
305 | return 0; | |
f4c89855 LB |
306 | |
307 | for (p = h1; p; p = p->next) { | |
308 | for (q = h2; q; q = q->next) { | |
309 | if ((p->type == q->type) && | |
310 | (p->length == q->length) && | |
311 | !memcmp(p->value, q->value, p->length)) { | |
312 | ||
313 | break; | |
314 | } | |
315 | } | |
316 | if (!q) | |
317 | return 0; | |
318 | } | |
319 | ||
320 | for (p = h2; p; p = p->next) { | |
321 | for (q = h1; q; q = q->next) { | |
322 | if ((p->type == q->type) && | |
323 | (p->length == q->length) && | |
324 | !memcmp(p->value, q->value, p->length)) { | |
325 | ||
326 | break; | |
327 | } | |
328 | } | |
329 | if (!q) | |
330 | return 0; | |
331 | } | |
332 | ||
333 | return 1; | |
334 | } | |
335 | ||
bede7744 LB |
336 | static void * |
337 | encap_hash_alloc (void *p) | |
338 | { | |
339 | /* Encap structure is already allocated. */ | |
340 | return p; | |
341 | } | |
342 | ||
343 | typedef enum | |
344 | { | |
345 | ENCAP_SUBTLV_TYPE, | |
346 | #if ENABLE_BGP_VNC | |
347 | VNC_SUBTLV_TYPE | |
348 | #endif | |
349 | } encap_subtlv_type; | |
350 | ||
351 | static struct bgp_attr_encap_subtlv * | |
352 | encap_intern (struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) | |
353 | { | |
354 | struct bgp_attr_encap_subtlv *find; | |
355 | struct hash *hash = encap_hash; | |
356 | #if ENABLE_BGP_VNC | |
357 | if (type == VNC_SUBTLV_TYPE) | |
358 | hash = vnc_hash; | |
359 | #endif | |
360 | ||
361 | find = hash_get (hash, encap, encap_hash_alloc); | |
362 | if (find != encap) | |
363 | encap_free (encap); | |
364 | find->refcnt++; | |
365 | ||
366 | return find; | |
367 | } | |
368 | ||
369 | static void | |
370 | encap_unintern (struct bgp_attr_encap_subtlv **encapp, encap_subtlv_type type) | |
371 | { | |
372 | struct bgp_attr_encap_subtlv *encap = *encapp; | |
373 | if (encap->refcnt) | |
374 | encap->refcnt--; | |
375 | ||
376 | if (encap->refcnt == 0) | |
377 | { | |
378 | struct hash *hash = encap_hash; | |
379 | #if ENABLE_BGP_VNC | |
380 | if (type == VNC_SUBTLV_TYPE) | |
381 | hash = vnc_hash; | |
382 | #endif | |
383 | hash_release (hash, encap); | |
384 | encap_free (encap); | |
385 | *encapp = NULL; | |
386 | } | |
387 | } | |
388 | ||
389 | static unsigned int | |
390 | encap_hash_key_make (void *p) | |
391 | { | |
392 | const struct bgp_attr_encap_subtlv * encap = p; | |
393 | ||
394 | return jhash(encap->value, encap->length, 0); | |
395 | } | |
396 | ||
397 | static int | |
398 | encap_hash_cmp (const void *p1, const void *p2) | |
399 | { | |
400 | return encap_same((struct bgp_attr_encap_subtlv *)p1, | |
401 | (struct bgp_attr_encap_subtlv *)p2); | |
402 | } | |
403 | ||
404 | static void | |
405 | encap_init (void) | |
406 | { | |
dfd19ccc | 407 | encap_hash = hash_create (encap_hash_key_make, encap_hash_cmp, NULL); |
bede7744 | 408 | #if ENABLE_BGP_VNC |
dfd19ccc | 409 | vnc_hash = hash_create (encap_hash_key_make, encap_hash_cmp, NULL); |
bede7744 LB |
410 | #endif |
411 | } | |
412 | ||
413 | static void | |
414 | encap_finish (void) | |
415 | { | |
416 | hash_clean (encap_hash, (void (*)(void *))encap_free); | |
417 | hash_free (encap_hash); | |
418 | encap_hash = NULL; | |
419 | #if ENABLE_BGP_VNC | |
420 | hash_clean (vnc_hash, (void (*)(void *))encap_free); | |
421 | hash_free (vnc_hash); | |
422 | vnc_hash = NULL; | |
423 | #endif | |
424 | } | |
425 | ||
684a7227 | 426 | static bool |
aadc0905 | 427 | overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 428 | { |
aadc0905 | 429 | if(!a1 && a2) |
684a7227 | 430 | return false; |
aadc0905 | 431 | if(!a2 && a1) |
684a7227 | 432 | return false; |
aadc0905 | 433 | if(!a1 && !a2) |
c298dae2 | 434 | return true; |
aadc0905 | 435 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), sizeof(struct overlay_index)); |
684a7227 PG |
436 | } |
437 | ||
718e3744 | 438 | /* Unknown transit attribute. */ |
9bddac4b | 439 | static struct hash *transit_hash; |
718e3744 | 440 | |
94f2b392 | 441 | static void |
718e3744 | 442 | transit_free (struct transit *transit) |
443 | { | |
444 | if (transit->val) | |
445 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
446 | XFREE (MTYPE_TRANSIT, transit); | |
447 | } | |
448 | ||
73ac8160 DS |
449 | static struct transit * |
450 | transit_dup (struct transit *transit) | |
451 | { | |
452 | struct transit *new; | |
453 | ||
454 | new = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); | |
455 | new->length = transit->length; | |
456 | if (new->length) | |
457 | { | |
458 | new->val = XMALLOC (MTYPE_TRANSIT_VAL, transit->length); | |
459 | memcpy (new->val, transit->val, transit->length); | |
460 | } | |
461 | else | |
462 | new->val = NULL; | |
463 | ||
464 | return new; | |
465 | } | |
923de654 | 466 | |
94f2b392 | 467 | static void * |
923de654 | 468 | transit_hash_alloc (void *p) |
718e3744 | 469 | { |
470 | /* Transit structure is already allocated. */ | |
923de654 | 471 | return p; |
718e3744 | 472 | } |
473 | ||
94f2b392 | 474 | static struct transit * |
718e3744 | 475 | transit_intern (struct transit *transit) |
476 | { | |
477 | struct transit *find; | |
478 | ||
479 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
480 | if (find != transit) | |
481 | transit_free (transit); | |
482 | find->refcnt++; | |
483 | ||
484 | return find; | |
485 | } | |
486 | ||
487 | void | |
488 | transit_unintern (struct transit *transit) | |
489 | { | |
718e3744 | 490 | if (transit->refcnt) |
491 | transit->refcnt--; | |
492 | ||
493 | if (transit->refcnt == 0) | |
494 | { | |
9206f9ec | 495 | hash_release (transit_hash, transit); |
718e3744 | 496 | transit_free (transit); |
497 | } | |
498 | } | |
499 | ||
94f2b392 | 500 | static unsigned int |
923de654 | 501 | transit_hash_key_make (void *p) |
718e3744 | 502 | { |
c8e7b895 | 503 | const struct transit * transit = p; |
718e3744 | 504 | |
c8e7b895 | 505 | return jhash(transit->val, transit->length, 0); |
718e3744 | 506 | } |
507 | ||
94f2b392 | 508 | static int |
ffe11cfb | 509 | transit_hash_cmp (const void *p1, const void *p2) |
718e3744 | 510 | { |
ffe11cfb SH |
511 | const struct transit * transit1 = p1; |
512 | const struct transit * transit2 = p2; | |
923de654 | 513 | |
ffe11cfb SH |
514 | return (transit1->length == transit2->length && |
515 | memcmp (transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 516 | } |
517 | ||
94f2b392 | 518 | static void |
66e5cd87 | 519 | transit_init (void) |
718e3744 | 520 | { |
dfd19ccc | 521 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp, NULL); |
718e3744 | 522 | } |
228da428 CC |
523 | |
524 | static void | |
525 | transit_finish (void) | |
526 | { | |
289d2501 | 527 | hash_clean (transit_hash, (void (*)(void *))transit_free); |
228da428 CC |
528 | hash_free (transit_hash); |
529 | transit_hash = NULL; | |
530 | } | |
6b0655a2 | 531 | |
718e3744 | 532 | /* Attribute hash routines. */ |
9bddac4b | 533 | static struct hash *attrhash; |
718e3744 | 534 | |
fb982c25 PJ |
535 | /* Shallow copy of an attribute |
536 | * Though, not so shallow that it doesn't copy the contents | |
537 | * of the attr_extra pointed to by 'extra' | |
538 | */ | |
539 | void | |
540 | bgp_attr_dup (struct attr *new, struct attr *orig) | |
541 | { | |
542 | *new = *orig; | |
fb982c25 PJ |
543 | } |
544 | ||
73ac8160 DS |
545 | void |
546 | bgp_attr_deep_dup (struct attr *new, struct attr *orig) | |
547 | { | |
548 | if (orig->aspath) | |
549 | new->aspath = aspath_dup(orig->aspath); | |
550 | ||
551 | if (orig->community) | |
552 | new->community = community_dup(orig->community); | |
553 | ||
aadc0905 DS |
554 | if (orig->ecommunity) |
555 | new->ecommunity = ecommunity_dup(orig->ecommunity); | |
556 | if (orig->cluster) | |
557 | new->cluster = cluster_dup(orig->cluster); | |
558 | if (orig->transit) | |
559 | new->transit = transit_dup(orig->transit); | |
560 | if (orig->encap_subtlvs) | |
561 | new->encap_subtlvs = encap_tlv_dup(orig->encap_subtlvs); | |
bede7744 | 562 | #if ENABLE_BGP_VNC |
aadc0905 DS |
563 | if (orig->vnc_subtlvs) |
564 | new->vnc_subtlvs = encap_tlv_dup(orig->vnc_subtlvs); | |
bede7744 | 565 | #endif |
73ac8160 DS |
566 | } |
567 | ||
568 | void | |
569 | bgp_attr_deep_free (struct attr *attr) | |
570 | { | |
571 | if (attr->aspath) | |
572 | aspath_free(attr->aspath); | |
573 | ||
574 | if (attr->community) | |
575 | community_free(attr->community); | |
576 | ||
aadc0905 DS |
577 | if (attr->ecommunity) |
578 | ecommunity_free(&attr->ecommunity); | |
579 | if (attr->cluster) | |
580 | cluster_free(attr->cluster); | |
581 | if (attr->transit) | |
582 | transit_free(attr->transit); | |
583 | if (attr->encap_subtlvs) | |
584 | encap_free(attr->encap_subtlvs); | |
bede7744 | 585 | #if ENABLE_BGP_VNC |
aadc0905 DS |
586 | if (attr->vnc_subtlvs) |
587 | encap_free(attr->vnc_subtlvs); | |
bede7744 | 588 | #endif |
73ac8160 DS |
589 | } |
590 | ||
cbdfbaa5 PJ |
591 | unsigned long int |
592 | attr_count (void) | |
593 | { | |
594 | return attrhash->count; | |
595 | } | |
596 | ||
597 | unsigned long int | |
598 | attr_unknown_count (void) | |
599 | { | |
600 | return transit_hash->count; | |
601 | } | |
602 | ||
718e3744 | 603 | unsigned int |
923de654 | 604 | attrhash_key_make (void *p) |
718e3744 | 605 | { |
7fb0cd82 | 606 | const struct attr *attr = (struct attr *) p; |
c8e7b895 SH |
607 | uint32_t key = 0; |
608 | #define MIX(val) key = jhash_1word(val, key) | |
609 | ||
610 | MIX(attr->origin); | |
611 | MIX(attr->nexthop.s_addr); | |
612 | MIX(attr->med); | |
613 | MIX(attr->local_pref); | |
718e3744 | 614 | |
c8f3fe30 PJ |
615 | key += attr->origin; |
616 | key += attr->nexthop.s_addr; | |
617 | key += attr->med; | |
618 | key += attr->local_pref; | |
fb982c25 | 619 | |
aadc0905 DS |
620 | MIX(attr->aggregator_as); |
621 | MIX(attr->aggregator_addr.s_addr); | |
622 | MIX(attr->weight); | |
623 | MIX(attr->mp_nexthop_global_in.s_addr); | |
624 | MIX(attr->originator_id.s_addr); | |
625 | MIX(attr->tag); | |
626 | MIX(attr->label); | |
627 | MIX(attr->label_index); | |
628 | ||
718e3744 | 629 | if (attr->aspath) |
c8e7b895 | 630 | MIX(aspath_key_make (attr->aspath)); |
718e3744 | 631 | if (attr->community) |
c8e7b895 | 632 | MIX(community_hash_make (attr->community)); |
aadc0905 DS |
633 | |
634 | if (attr->lcommunity) | |
635 | MIX(lcommunity_hash_make (attr->lcommunity)); | |
636 | if (attr->ecommunity) | |
637 | MIX(ecommunity_hash_make (attr->ecommunity)); | |
638 | if (attr->cluster) | |
639 | MIX(cluster_hash_key_make (attr->cluster)); | |
640 | if (attr->transit) | |
641 | MIX(transit_hash_key_make (attr->transit)); | |
642 | if (attr->encap_subtlvs) | |
643 | MIX(encap_hash_key_make (attr->encap_subtlvs)); | |
bede7744 | 644 | #if ENABLE_BGP_VNC |
aadc0905 DS |
645 | if (attr->vnc_subtlvs) |
646 | MIX(encap_hash_key_make (attr->vnc_subtlvs)); | |
bede7744 | 647 | #endif |
aadc0905 DS |
648 | MIX(attr->mp_nexthop_len); |
649 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
650 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
718e3744 | 651 | |
652 | return key; | |
653 | } | |
654 | ||
655 | int | |
ffe11cfb | 656 | attrhash_cmp (const void *p1, const void *p2) |
718e3744 | 657 | { |
ffe11cfb SH |
658 | const struct attr * attr1 = p1; |
659 | const struct attr * attr2 = p2; | |
923de654 | 660 | |
718e3744 | 661 | if (attr1->flag == attr2->flag |
662 | && attr1->origin == attr2->origin | |
663 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
fb982c25 PJ |
664 | && attr1->aspath == attr2->aspath |
665 | && attr1->community == attr2->community | |
718e3744 | 666 | && attr1->med == attr2->med |
3f9c7369 DS |
667 | && attr1->local_pref == attr2->local_pref |
668 | && attr1->rmap_change_flags == attr2->rmap_change_flags) | |
fb982c25 | 669 | { |
aadc0905 DS |
670 | if (attr1->aggregator_as == attr2->aggregator_as |
671 | && attr1->aggregator_addr.s_addr == attr2->aggregator_addr.s_addr | |
672 | && attr1->weight == attr2->weight | |
673 | && attr1->tag == attr2->tag | |
674 | && attr1->label_index == attr2->label_index | |
675 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
676 | && IPV6_ADDR_SAME (&attr1->mp_nexthop_global, &attr2->mp_nexthop_global) | |
677 | && IPV6_ADDR_SAME (&attr1->mp_nexthop_local, &attr2->mp_nexthop_local) | |
678 | && IPV4_ADDR_SAME (&attr1->mp_nexthop_global_in, &attr2->mp_nexthop_global_in) | |
679 | && attr1->ecommunity == attr2->ecommunity | |
680 | && attr1->lcommunity == attr2->lcommunity | |
681 | && attr1->cluster == attr2->cluster | |
682 | && attr1->transit == attr2->transit | |
683 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
684 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
65efcfce | 685 | #if ENABLE_BGP_VNC |
aadc0905 | 686 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) |
65efcfce | 687 | #endif |
aadc0905 DS |
688 | && IPV4_ADDR_SAME (&attr1->originator_id, &attr2->originator_id) |
689 | && overlay_index_same(attr1, attr2)) | |
fb982c25 | 690 | return 1; |
fb982c25 | 691 | } |
aadc0905 DS |
692 | |
693 | return 0; | |
718e3744 | 694 | } |
695 | ||
94f2b392 | 696 | static void |
ffe11cfb | 697 | attrhash_init (void) |
718e3744 | 698 | { |
dfd19ccc | 699 | attrhash = hash_create (attrhash_key_make, attrhash_cmp, "BGP Attributes"); |
718e3744 | 700 | } |
701 | ||
289d2501 LB |
702 | /* |
703 | * special for hash_clean below | |
704 | */ | |
705 | static void | |
706 | attr_vfree (void *attr) | |
707 | { | |
289d2501 LB |
708 | XFREE (MTYPE_ATTR, attr); |
709 | } | |
710 | ||
228da428 CC |
711 | static void |
712 | attrhash_finish (void) | |
713 | { | |
289d2501 | 714 | hash_clean(attrhash, attr_vfree); |
228da428 CC |
715 | hash_free (attrhash); |
716 | attrhash = NULL; | |
717 | } | |
718 | ||
94f2b392 | 719 | static void |
718e3744 | 720 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
721 | { | |
722 | struct attr *attr = backet->data; | |
723 | ||
5c7571d4 | 724 | vty_out (vty, "attr[%ld] nexthop %s\n", attr->refcnt, |
96ade3ed | 725 | inet_ntoa(attr->nexthop)); |
718e3744 | 726 | } |
727 | ||
728 | void | |
729 | attr_show_all (struct vty *vty) | |
730 | { | |
731 | hash_iterate (attrhash, | |
732 | (void (*)(struct hash_backet *, void *)) | |
733 | attr_show_all_iterator, | |
734 | vty); | |
735 | } | |
736 | ||
94f2b392 | 737 | static void * |
923de654 | 738 | bgp_attr_hash_alloc (void *p) |
718e3744 | 739 | { |
aadc0905 | 740 | struct attr * val = (struct attr *) p; |
718e3744 | 741 | struct attr *attr; |
742 | ||
743 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
744 | *attr = *val; | |
aadc0905 DS |
745 | if (val->encap_subtlvs) { |
746 | val->encap_subtlvs = NULL; | |
747 | } | |
65efcfce | 748 | #if ENABLE_BGP_VNC |
aadc0905 DS |
749 | if (val->vnc_subtlvs) { |
750 | val->vnc_subtlvs = NULL; | |
751 | } | |
65efcfce | 752 | #endif |
718e3744 | 753 | attr->refcnt = 0; |
754 | return attr; | |
755 | } | |
756 | ||
757 | /* Internet argument attribute. */ | |
758 | struct attr * | |
759 | bgp_attr_intern (struct attr *attr) | |
760 | { | |
761 | struct attr *find; | |
762 | ||
763 | /* Intern referenced strucutre. */ | |
764 | if (attr->aspath) | |
765 | { | |
766 | if (! attr->aspath->refcnt) | |
767 | attr->aspath = aspath_intern (attr->aspath); | |
768 | else | |
769 | attr->aspath->refcnt++; | |
770 | } | |
771 | if (attr->community) | |
772 | { | |
773 | if (! attr->community->refcnt) | |
774 | attr->community = community_intern (attr->community); | |
775 | else | |
776 | attr->community->refcnt++; | |
777 | } | |
aadc0905 DS |
778 | |
779 | if (attr->ecommunity) | |
718e3744 | 780 | { |
aadc0905 DS |
781 | if (! attr->ecommunity->refcnt) |
782 | attr->ecommunity = ecommunity_intern (attr->ecommunity); | |
783 | else | |
784 | attr->ecommunity->refcnt++; | |
785 | } | |
786 | if (attr->lcommunity) | |
787 | { | |
788 | if (! attr->lcommunity->refcnt) | |
789 | attr->lcommunity = lcommunity_intern (attr->lcommunity); | |
790 | else | |
791 | attr->lcommunity->refcnt++; | |
792 | } | |
793 | if (attr->cluster) | |
794 | { | |
795 | if (! attr->cluster->refcnt) | |
796 | attr->cluster = cluster_intern (attr->cluster); | |
797 | else | |
798 | attr->cluster->refcnt++; | |
799 | } | |
800 | if (attr->transit) | |
801 | { | |
802 | if (! attr->transit->refcnt) | |
803 | attr->transit = transit_intern (attr->transit); | |
804 | else | |
805 | attr->transit->refcnt++; | |
806 | } | |
807 | if (attr->encap_subtlvs) | |
808 | { | |
809 | if (! attr->encap_subtlvs->refcnt) | |
810 | attr->encap_subtlvs = encap_intern (attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
811 | else | |
812 | attr->encap_subtlvs->refcnt++; | |
813 | } | |
bede7744 | 814 | #if ENABLE_BGP_VNC |
aadc0905 DS |
815 | if (attr->vnc_subtlvs) |
816 | { | |
817 | if (! attr->vnc_subtlvs->refcnt) | |
818 | attr->vnc_subtlvs = encap_intern (attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
819 | else | |
820 | attr->vnc_subtlvs->refcnt++; | |
718e3744 | 821 | } |
aadc0905 | 822 | #endif |
f6f434b2 | 823 | |
718e3744 | 824 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); |
825 | find->refcnt++; | |
bede7744 | 826 | |
718e3744 | 827 | return find; |
828 | } | |
829 | ||
3f9c7369 DS |
830 | /** |
831 | * Increment the refcount on various structures that attr holds. | |
832 | * Note on usage: call _only_ when the 'attr' object has already | |
833 | * been 'intern'ed and exists in 'attrhash' table. The function | |
834 | * serves to hold a reference to that (real) object. | |
835 | * Note also that the caller can safely call bgp_attr_unintern() | |
836 | * after calling bgp_attr_refcount(). That would release the | |
837 | * reference and could result in a free() of the attr object. | |
838 | */ | |
839 | struct attr * | |
840 | bgp_attr_refcount (struct attr *attr) | |
841 | { | |
842 | /* Intern referenced strucutre. */ | |
843 | if (attr->aspath) | |
844 | attr->aspath->refcnt++; | |
845 | ||
846 | if (attr->community) | |
847 | attr->community->refcnt++; | |
848 | ||
aadc0905 DS |
849 | if (attr->ecommunity) |
850 | attr->ecommunity->refcnt++; | |
3f9c7369 | 851 | |
aadc0905 DS |
852 | if (attr->cluster) |
853 | attr->cluster->refcnt++; | |
3f9c7369 | 854 | |
aadc0905 DS |
855 | if (attr->transit) |
856 | attr->transit->refcnt++; | |
bede7744 | 857 | |
aadc0905 DS |
858 | if (attr->encap_subtlvs) |
859 | attr->encap_subtlvs->refcnt++; | |
bede7744 LB |
860 | |
861 | #if ENABLE_BGP_VNC | |
aadc0905 DS |
862 | if (attr->vnc_subtlvs) |
863 | attr->vnc_subtlvs->refcnt++; | |
bede7744 | 864 | #endif |
aadc0905 | 865 | |
3f9c7369 DS |
866 | attr->refcnt++; |
867 | return attr; | |
868 | } | |
03e214c8 | 869 | |
718e3744 | 870 | /* Make network statement's attribute. */ |
871 | struct attr * | |
872 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
873 | { | |
874 | memset (attr, 0, sizeof (struct attr)); | |
fb982c25 | 875 | |
718e3744 | 876 | attr->origin = origin; |
877 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
878 | attr->aspath = aspath_empty (); | |
879 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
aadc0905 DS |
880 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; |
881 | attr->tag = 0; | |
882 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
883 | attr->label = MPLS_INVALID_LABEL; | |
718e3744 | 884 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
aadc0905 | 885 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; |
03e214c8 | 886 | |
718e3744 | 887 | return attr; |
888 | } | |
889 | ||
b5d58c32 | 890 | /* Create the attributes for an aggregate */ |
718e3744 | 891 | struct attr * |
892 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
893 | struct aspath *aspath, | |
42f7e184 DS |
894 | struct community *community, int as_set, |
895 | u_char atomic_aggregate) | |
718e3744 | 896 | { |
897 | struct attr attr; | |
898 | struct attr *new; | |
899 | ||
900 | memset (&attr, 0, sizeof (struct attr)); | |
938ef3a2 | 901 | |
718e3744 | 902 | /* Origin attribute. */ |
903 | attr.origin = origin; | |
904 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
905 | ||
906 | /* AS path attribute. */ | |
907 | if (aspath) | |
908 | attr.aspath = aspath_intern (aspath); | |
909 | else | |
910 | attr.aspath = aspath_empty (); | |
911 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
912 | ||
913 | /* Next hop attribute. */ | |
914 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
915 | ||
916 | if (community) | |
917 | { | |
918 | attr.community = community; | |
919 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
920 | } | |
921 | ||
aadc0905 DS |
922 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
923 | attr.label = MPLS_INVALID_LABEL; | |
924 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
925 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
42f7e184 | 926 | if (! as_set || atomic_aggregate) |
718e3744 | 927 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); |
928 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
929 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
aadc0905 | 930 | attr.aggregator_as = bgp->confed_id; |
718e3744 | 931 | else |
aadc0905 DS |
932 | attr.aggregator_as = bgp->as; |
933 | attr.aggregator_addr = bgp->router_id; | |
934 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
935 | attr.label = MPLS_INVALID_LABEL; | |
718e3744 | 936 | |
937 | new = bgp_attr_intern (&attr); | |
938ef3a2 | 938 | |
f6f434b2 | 939 | aspath_unintern (&new->aspath); |
718e3744 | 940 | return new; |
941 | } | |
942 | ||
b881c707 PJ |
943 | /* Unintern just the sub-components of the attr, but not the attr */ |
944 | void | |
945 | bgp_attr_unintern_sub (struct attr *attr) | |
946 | { | |
947 | /* aspath refcount shoud be decrement. */ | |
948 | if (attr->aspath) | |
949 | aspath_unintern (&attr->aspath); | |
d92a2f39 | 950 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)); |
b881c707 PJ |
951 | |
952 | if (attr->community) | |
953 | community_unintern (&attr->community); | |
d92a2f39 | 954 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)); |
b881c707 | 955 | |
aadc0905 DS |
956 | if (attr->ecommunity) |
957 | ecommunity_unintern (&attr->ecommunity); | |
958 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES)); | |
57d187bc | 959 | |
aadc0905 DS |
960 | if (attr->lcommunity) |
961 | lcommunity_unintern (&attr->lcommunity); | |
962 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES)); | |
2acb4ac2 | 963 | |
aadc0905 DS |
964 | if (attr->cluster) |
965 | cluster_unintern (attr->cluster); | |
966 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST)); | |
967 | ||
968 | if (attr->transit) | |
969 | transit_unintern (attr->transit); | |
bede7744 | 970 | |
aadc0905 DS |
971 | if (attr->encap_subtlvs) |
972 | encap_unintern (&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 LB |
973 | |
974 | #if ENABLE_BGP_VNC | |
aadc0905 DS |
975 | if (attr->vnc_subtlvs) |
976 | encap_unintern (&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 977 | #endif |
b881c707 PJ |
978 | } |
979 | ||
718e3744 | 980 | /* Free bgp attribute and aspath. */ |
981 | void | |
1a2fd707 | 982 | bgp_attr_unintern (struct attr **pattr) |
718e3744 | 983 | { |
1a2fd707 | 984 | struct attr *attr = *pattr; |
718e3744 | 985 | struct attr *ret; |
b881c707 | 986 | struct attr tmp; |
aadc0905 | 987 | |
718e3744 | 988 | /* Decrement attribute reference. */ |
1a2fd707 | 989 | attr->refcnt--; |
aadc0905 | 990 | |
1a2fd707 | 991 | tmp = *attr; |
b881c707 | 992 | |
718e3744 | 993 | /* If reference becomes zero then free attribute object. */ |
1a2fd707 JBD |
994 | if (attr->refcnt == 0) |
995 | { | |
996 | ret = hash_release (attrhash, attr); | |
718e3744 | 997 | assert (ret != NULL); |
1a2fd707 JBD |
998 | XFREE (MTYPE_ATTR, attr); |
999 | *pattr = NULL; | |
718e3744 | 1000 | } |
1001 | ||
b881c707 | 1002 | bgp_attr_unintern_sub (&tmp); |
718e3744 | 1003 | } |
1004 | ||
1005 | void | |
1006 | bgp_attr_flush (struct attr *attr) | |
1007 | { | |
1008 | if (attr->aspath && ! attr->aspath->refcnt) | |
f9a3a260 LB |
1009 | { |
1010 | aspath_free (attr->aspath); | |
1011 | attr->aspath = NULL; | |
1012 | } | |
718e3744 | 1013 | if (attr->community && ! attr->community->refcnt) |
f9a3a260 LB |
1014 | { |
1015 | community_free (attr->community); | |
1016 | attr->community = NULL; | |
1017 | } | |
f6f434b2 | 1018 | |
aadc0905 DS |
1019 | if (attr->ecommunity && ! attr->ecommunity->refcnt) |
1020 | ecommunity_free (&attr->ecommunity); | |
1021 | if (attr->lcommunity && ! attr->lcommunity->refcnt) | |
1022 | lcommunity_free (&attr->lcommunity); | |
1023 | if (attr->cluster && ! attr->cluster->refcnt) | |
1024 | { | |
1025 | cluster_free (attr->cluster); | |
1026 | attr->cluster = NULL; | |
1027 | } | |
1028 | if (attr->transit && ! attr->transit->refcnt) | |
1029 | { | |
1030 | transit_free (attr->transit); | |
1031 | attr->transit = NULL; | |
1032 | } | |
1033 | if (attr->encap_subtlvs && ! attr->encap_subtlvs->refcnt) | |
1034 | { | |
1035 | encap_free(attr->encap_subtlvs); | |
1036 | attr->encap_subtlvs = NULL; | |
1037 | } | |
65efcfce | 1038 | #if ENABLE_BGP_VNC |
aadc0905 DS |
1039 | if (attr->vnc_subtlvs && ! attr->vnc_subtlvs->refcnt) |
1040 | { | |
1041 | encap_free(attr->vnc_subtlvs); | |
1042 | attr->vnc_subtlvs = NULL; | |
fb982c25 | 1043 | } |
aadc0905 | 1044 | #endif |
718e3744 | 1045 | } |
1046 | ||
b881c707 PJ |
1047 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1048 | * avoid resetting sessions for malformed attributes which are | |
1049 | * are partial/optional and hence where the error likely was not | |
1050 | * introduced by the sending neighbour. | |
1051 | */ | |
1052 | static bgp_attr_parse_ret_t | |
835315bf PJ |
1053 | bgp_attr_malformed (struct bgp_attr_parser_args *args, u_char subcode, |
1054 | bgp_size_t length) | |
b881c707 | 1055 | { |
835315bf PJ |
1056 | struct peer *const peer = args->peer; |
1057 | const u_int8_t flags = args->flags; | |
1058 | /* startp and length must be special-cased, as whether or not to | |
1059 | * send the attribute data with the NOTIFY depends on the error, | |
1060 | * the caller therefore signals this with the seperate length argument | |
1061 | */ | |
bd471fea | 1062 | u_char *notify_datap = (length > 0 ? args->startp : NULL); |
835315bf | 1063 | |
b881c707 | 1064 | /* Only relax error handling for eBGP peers */ |
6d85b15b | 1065 | if (peer->sort != BGP_PEER_EBGP) |
b881c707 PJ |
1066 | { |
1067 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 1068 | notify_datap, length); |
b881c707 PJ |
1069 | return BGP_ATTR_PARSE_ERROR; |
1070 | ||
1071 | } | |
1072 | ||
bd471fea PJ |
1073 | /* Adjust the stream getp to the end of the attribute, in case we can |
1074 | * still proceed but the caller hasn't read all the attribute. | |
1075 | */ | |
1076 | stream_set_getp (BGP_INPUT (peer), | |
1077 | (args->startp - STREAM_DATA (BGP_INPUT (peer))) | |
1078 | + args->total); | |
1079 | ||
835315bf | 1080 | switch (args->type) { |
fa61e16d PJ |
1081 | /* where an attribute is relatively inconsequential, e.g. it does not |
1082 | * affect route selection, and can be safely ignored, then any such | |
1083 | * attributes which are malformed should just be ignored and the route | |
1084 | * processed as normal. | |
b881c707 PJ |
1085 | */ |
1086 | case BGP_ATTR_AS4_AGGREGATOR: | |
1087 | case BGP_ATTR_AGGREGATOR: | |
1088 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1089 | return BGP_ATTR_PARSE_PROCEED; | |
1090 | ||
1091 | /* Core attributes, particularly ones which may influence route | |
fa61e16d | 1092 | * selection, should always cause session resets |
b881c707 PJ |
1093 | */ |
1094 | case BGP_ATTR_ORIGIN: | |
1095 | case BGP_ATTR_AS_PATH: | |
1096 | case BGP_ATTR_NEXT_HOP: | |
1097 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1098 | case BGP_ATTR_LOCAL_PREF: | |
1099 | case BGP_ATTR_COMMUNITIES: | |
1100 | case BGP_ATTR_ORIGINATOR_ID: | |
1101 | case BGP_ATTR_CLUSTER_LIST: | |
1102 | case BGP_ATTR_MP_REACH_NLRI: | |
1103 | case BGP_ATTR_MP_UNREACH_NLRI: | |
1104 | case BGP_ATTR_EXT_COMMUNITIES: | |
1105 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 1106 | notify_datap, length); |
b881c707 PJ |
1107 | return BGP_ATTR_PARSE_ERROR; |
1108 | } | |
1109 | ||
1110 | /* Partial optional attributes that are malformed should not cause | |
1111 | * the whole session to be reset. Instead treat it as a withdrawal | |
1112 | * of the routes, if possible. | |
1113 | */ | |
835315bf PJ |
1114 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS) |
1115 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1116 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
b881c707 PJ |
1117 | return BGP_ATTR_PARSE_WITHDRAW; |
1118 | ||
1119 | /* default to reset */ | |
f57000c0 | 1120 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
b881c707 PJ |
1121 | } |
1122 | ||
afcb7679 DO |
1123 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1124 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1125 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1126 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1127 | non-transitive" attribute. */ | |
1128 | static void | |
835315bf PJ |
1129 | bgp_attr_flags_diagnose (struct bgp_attr_parser_args *args, |
1130 | u_int8_t desired_flags /* how RFC says it must be */ | |
afcb7679 DO |
1131 | ) |
1132 | { | |
1133 | u_char seen = 0, i; | |
835315bf PJ |
1134 | u_char real_flags = args->flags; |
1135 | const u_int8_t attr_code = args->type; | |
1136 | ||
afcb7679 DO |
1137 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; |
1138 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1139 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1140 | if | |
1141 | ( | |
1142 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) != | |
1143 | CHECK_FLAG (real_flags, attr_flag_str[i].key) | |
1144 | ) | |
1145 | { | |
16286195 | 1146 | zlog_err ("%s attribute must%s be flagged as \"%s\"", |
56b40679 | 1147 | lookup_msg(attr_str, attr_code, NULL), |
16286195 DS |
1148 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) ? "" : " not", |
1149 | attr_flag_str[i].str); | |
afcb7679 DO |
1150 | seen = 1; |
1151 | } | |
fa5831e8 PJ |
1152 | if (!seen) |
1153 | { | |
16286195 DS |
1154 | zlog_debug ("Strange, %s called for attr %s, but no problem found with flags" |
1155 | " (real flags 0x%x, desired 0x%x)", | |
56b40679 | 1156 | __func__, lookup_msg(attr_str, attr_code, NULL), |
16286195 | 1157 | real_flags, desired_flags); |
fa5831e8 | 1158 | } |
afcb7679 DO |
1159 | } |
1160 | ||
3ecab4c8 PJ |
1161 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1162 | * as will PARTIAL for optional+transitive attributes. | |
1163 | */ | |
1164 | const u_int8_t attr_flags_values [] = { | |
1165 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1166 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1167 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1168 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1169 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1170 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1171 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1172 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1173 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1174 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1175 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1176 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1177 | [BGP_ATTR_EXT_COMMUNITIES] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1178 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1179 | [BGP_ATTR_AS4_AGGREGATOR] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
2acb4ac2 | 1180 | [BGP_ATTR_LARGE_COMMUNITIES]= BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
c5a543b4 | 1181 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
3ecab4c8 | 1182 | }; |
099111ef | 1183 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 PJ |
1184 | |
1185 | static int | |
835315bf | 1186 | bgp_attr_flag_invalid (struct bgp_attr_parser_args *args) |
3ecab4c8 PJ |
1187 | { |
1188 | u_int8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
835315bf PJ |
1189 | const u_int8_t flags = args->flags; |
1190 | const u_int8_t attr_code = args->type; | |
3ecab4c8 PJ |
1191 | |
1192 | /* there may be attributes we don't know about */ | |
1193 | if (attr_code > attr_flags_values_max) | |
1194 | return 0; | |
1195 | if (attr_flags_values[attr_code] == 0) | |
1196 | return 0; | |
1197 | ||
1198 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set to | |
1199 | * 1." | |
1200 | */ | |
1201 | if (!CHECK_FLAG (BGP_ATTR_FLAG_OPTIONAL, flags) | |
1202 | && !CHECK_FLAG (BGP_ATTR_FLAG_TRANS, flags)) | |
1203 | { | |
16286195 | 1204 | zlog_err ("%s well-known attributes must have transitive flag set (%x)", |
56b40679 | 1205 | lookup_msg(attr_str, attr_code, NULL), flags); |
3ecab4c8 PJ |
1206 | return 1; |
1207 | } | |
1208 | ||
1209 | /* "For well-known attributes and for optional non-transitive attributes, | |
1210 | * the Partial bit MUST be set to 0." | |
1211 | */ | |
1212 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
1213 | { | |
1214 | if (!CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL)) | |
1215 | { | |
16286195 DS |
1216 | zlog_err ("%s well-known attribute " |
1217 | "must NOT have the partial flag set (%x)", | |
56b40679 | 1218 | lookup_msg(attr_str, attr_code, NULL), flags); |
3ecab4c8 PJ |
1219 | return 1; |
1220 | } | |
1221 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1222 | && !CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1223 | { | |
16286195 DS |
1224 | zlog_err ("%s optional + transitive attribute " |
1225 | "must NOT have the partial flag set (%x)", | |
56b40679 | 1226 | lookup_msg(attr_str, attr_code, NULL), flags); |
3ecab4c8 PJ |
1227 | return 1; |
1228 | } | |
1229 | } | |
1230 | ||
1231 | /* Optional transitive attributes may go through speakers that don't | |
1232 | * reocgnise them and set the Partial bit. | |
1233 | */ | |
1234 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1235 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1236 | SET_FLAG (mask, BGP_ATTR_FLAG_PARTIAL); | |
1237 | ||
683f2b86 | 1238 | if ((flags & ~mask) |
3ecab4c8 PJ |
1239 | == attr_flags_values[attr_code]) |
1240 | return 0; | |
1241 | ||
835315bf | 1242 | bgp_attr_flags_diagnose (args, attr_flags_values[attr_code]); |
3ecab4c8 PJ |
1243 | return 1; |
1244 | } | |
1245 | ||
718e3744 | 1246 | /* Get origin attribute of the update message. */ |
b881c707 | 1247 | static bgp_attr_parse_ret_t |
835315bf | 1248 | bgp_attr_origin (struct bgp_attr_parser_args *args) |
718e3744 | 1249 | { |
835315bf PJ |
1250 | struct peer *const peer = args->peer; |
1251 | struct attr *const attr = args->attr; | |
1252 | const bgp_size_t length = args->length; | |
1253 | ||
718e3744 | 1254 | /* If any recognized attribute has Attribute Length that conflicts |
1255 | with the expected length (based on the attribute type code), then | |
1256 | the Error Subcode is set to Attribute Length Error. The Data | |
1257 | field contains the erroneous attribute (type, length and | |
1258 | value). */ | |
1259 | if (length != 1) | |
1260 | { | |
16286195 | 1261 | zlog_err ("Origin attribute length is not one %d", length); |
835315bf | 1262 | return bgp_attr_malformed (args, |
b881c707 | 1263 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1264 | args->total); |
718e3744 | 1265 | } |
1266 | ||
1267 | /* Fetch origin attribute. */ | |
1268 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
1269 | ||
1270 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1271 | Subcode is set to Invalid Origin Attribute. The Data field | |
1272 | contains the unrecognized attribute (type, length and value). */ | |
1273 | if ((attr->origin != BGP_ORIGIN_IGP) | |
1274 | && (attr->origin != BGP_ORIGIN_EGP) | |
1275 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
1276 | { | |
16286195 | 1277 | zlog_err ("Origin attribute value is invalid %d", attr->origin); |
835315bf | 1278 | return bgp_attr_malformed (args, |
b881c707 | 1279 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
835315bf | 1280 | args->total); |
718e3744 | 1281 | } |
1282 | ||
1283 | /* Set oring attribute flag. */ | |
1284 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
1285 | ||
1286 | return 0; | |
1287 | } | |
ab005298 PJ |
1288 | |
1289 | /* Parse AS path information. This function is wrapper of | |
1290 | aspath_parse. */ | |
1291 | static int | |
835315bf | 1292 | bgp_attr_aspath (struct bgp_attr_parser_args *args) |
718e3744 | 1293 | { |
835315bf PJ |
1294 | struct attr *const attr = args->attr; |
1295 | struct peer *const peer = args->peer; | |
1296 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1297 | |
ab005298 PJ |
1298 | /* |
1299 | * peer with AS4 => will get 4Byte ASnums | |
1300 | * otherwise, will get 16 Bit | |
0b2aa3a0 | 1301 | */ |
ab005298 PJ |
1302 | attr->aspath = aspath_parse (peer->ibuf, length, |
1303 | CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)); | |
0b2aa3a0 | 1304 | |
ab005298 PJ |
1305 | /* In case of IBGP, length will be zero. */ |
1306 | if (! attr->aspath) | |
cddb8112 | 1307 | { |
16286195 | 1308 | zlog_err ("Malformed AS path from %s, length is %d", peer->host, length); |
835315bf | 1309 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, 0); |
cddb8112 | 1310 | } |
cddb8112 | 1311 | |
ab005298 PJ |
1312 | /* Set aspath attribute flag. */ |
1313 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
0b2aa3a0 | 1314 | |
b881c707 | 1315 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1316 | } |
1317 | ||
b881c707 | 1318 | static bgp_attr_parse_ret_t |
835315bf | 1319 | bgp_attr_aspath_check (struct peer *const peer, struct attr *const attr) |
0b2aa3a0 PJ |
1320 | { |
1321 | /* These checks were part of bgp_attr_aspath, but with | |
1322 | * as4 we should to check aspath things when | |
1323 | * aspath synthesizing with as4_path has already taken place. | |
1324 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1325 | * not right. | |
1326 | * So do the checks later, i.e. here | |
1327 | */ | |
1328 | struct bgp *bgp = peer->bgp; | |
1329 | struct aspath *aspath; | |
1330 | ||
ca87e1d3 | 1331 | /* Confederation sanity check. */ |
6d85b15b JBD |
1332 | if ((peer->sort == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) || |
1333 | (peer->sort == BGP_PEER_EBGP && aspath_confed_check (attr->aspath))) | |
ca87e1d3 | 1334 | { |
16286195 | 1335 | zlog_err ("Malformed AS path from %s", peer->host); |
835315bf PJ |
1336 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1337 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1338 | return BGP_ATTR_PARSE_ERROR; | |
ca87e1d3 VT |
1339 | } |
1340 | ||
718e3744 | 1341 | /* First AS check for EBGP. */ |
1342 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
1343 | { | |
6d85b15b | 1344 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 1345 | && ! aspath_firstas_check (attr->aspath, peer->as)) |
1346 | { | |
16286195 | 1347 | zlog_err ("%s incorrect first AS (must be %u)", peer->host, peer->as); |
835315bf PJ |
1348 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1349 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1350 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 1351 | } |
1352 | } | |
1353 | ||
1354 | /* local-as prepend */ | |
1355 | if (peer->change_local_as && | |
1356 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
1357 | { | |
1358 | aspath = aspath_dup (attr->aspath); | |
1359 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
f6f434b2 | 1360 | aspath_unintern (&attr->aspath); |
718e3744 | 1361 | attr->aspath = aspath_intern (aspath); |
1362 | } | |
1363 | ||
b881c707 | 1364 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1365 | } |
1366 | ||
ab005298 PJ |
1367 | /* Parse AS4 path information. This function is another wrapper of |
1368 | aspath_parse. */ | |
1369 | static int | |
835315bf | 1370 | bgp_attr_as4_path (struct bgp_attr_parser_args *args, struct aspath **as4_path) |
ab005298 | 1371 | { |
835315bf PJ |
1372 | struct peer *const peer = args->peer; |
1373 | struct attr *const attr = args->attr; | |
1374 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1375 | |
ab005298 PJ |
1376 | *as4_path = aspath_parse (peer->ibuf, length, 1); |
1377 | ||
b881c707 PJ |
1378 | /* In case of IBGP, length will be zero. */ |
1379 | if (!*as4_path) | |
1380 | { | |
16286195 | 1381 | zlog_err ("Malformed AS4 path from %s, length is %d", peer->host, length); |
835315bf | 1382 | return bgp_attr_malformed (args, |
b881c707 | 1383 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
835315bf | 1384 | 0); |
b881c707 PJ |
1385 | } |
1386 | ||
ab005298 | 1387 | /* Set aspath attribute flag. */ |
46c3ce83 | 1388 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_PATH); |
ab005298 | 1389 | |
b881c707 | 1390 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1391 | } |
1392 | ||
718e3744 | 1393 | /* Nexthop attribute. */ |
b881c707 | 1394 | static bgp_attr_parse_ret_t |
835315bf | 1395 | bgp_attr_nexthop (struct bgp_attr_parser_args *args) |
718e3744 | 1396 | { |
835315bf PJ |
1397 | struct peer *const peer = args->peer; |
1398 | struct attr *const attr = args->attr; | |
1399 | const bgp_size_t length = args->length; | |
1400 | ||
bc3443eb | 1401 | in_addr_t nexthop_h, nexthop_n; |
718e3744 | 1402 | |
718e3744 | 1403 | /* Check nexthop attribute length. */ |
1404 | if (length != 4) | |
1405 | { | |
16286195 | 1406 | zlog_err ("Nexthop attribute length isn't four [%d]", length); |
718e3744 | 1407 | |
835315bf | 1408 | return bgp_attr_malformed (args, |
b881c707 | 1409 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1410 | args->total); |
718e3744 | 1411 | } |
1412 | ||
58298ccd DS |
1413 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP |
1414 | attribute must result in a NOTIFICATION message (this is implemented below). | |
1415 | At the same time, semantically incorrect NEXT_HOP is more likely to be just | |
1416 | logged locally (this is implemented somewhere else). The UPDATE message | |
1417 | gets ignored in any of these cases. */ | |
bc3443eb DO |
1418 | nexthop_n = stream_get_ipv4 (peer->ibuf); |
1419 | nexthop_h = ntohl (nexthop_n); | |
cebb7440 LB |
1420 | if ((IPV4_NET0 (nexthop_h) || IPV4_NET127 (nexthop_h) || IPV4_CLASS_DE (nexthop_h)) |
1421 | && !BGP_DEBUG (allow_martians, ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
bc3443eb DO |
1422 | { |
1423 | char buf[INET_ADDRSTRLEN]; | |
bb02b823 | 1424 | inet_ntop (AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); |
16286195 | 1425 | zlog_err ("Martian nexthop %s", buf); |
835315bf | 1426 | return bgp_attr_malformed (args, |
bc3443eb | 1427 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, |
835315bf | 1428 | args->total); |
bc3443eb DO |
1429 | } |
1430 | ||
1431 | attr->nexthop.s_addr = nexthop_n; | |
718e3744 | 1432 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
1433 | ||
b881c707 | 1434 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1435 | } |
1436 | ||
1437 | /* MED atrribute. */ | |
b881c707 | 1438 | static bgp_attr_parse_ret_t |
835315bf | 1439 | bgp_attr_med (struct bgp_attr_parser_args *args) |
718e3744 | 1440 | { |
835315bf PJ |
1441 | struct peer *const peer = args->peer; |
1442 | struct attr *const attr = args->attr; | |
1443 | const bgp_size_t length = args->length; | |
1444 | ||
718e3744 | 1445 | /* Length check. */ |
1446 | if (length != 4) | |
1447 | { | |
16286195 | 1448 | zlog_err ("MED attribute length isn't four [%d]", length); |
b881c707 | 1449 | |
835315bf | 1450 | return bgp_attr_malformed (args, |
b881c707 | 1451 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1452 | args->total); |
718e3744 | 1453 | } |
1454 | ||
1455 | attr->med = stream_getl (peer->ibuf); | |
1456 | ||
1457 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
1458 | ||
b881c707 | 1459 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1460 | } |
1461 | ||
1462 | /* Local preference attribute. */ | |
b881c707 | 1463 | static bgp_attr_parse_ret_t |
835315bf | 1464 | bgp_attr_local_pref (struct bgp_attr_parser_args *args) |
718e3744 | 1465 | { |
835315bf PJ |
1466 | struct peer *const peer = args->peer; |
1467 | struct attr *const attr = args->attr; | |
1468 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1469 | |
a624cae2 DO |
1470 | /* Length check. */ |
1471 | if (length != 4) | |
1472 | { | |
16286195 | 1473 | zlog_err ("LOCAL_PREF attribute length isn't 4 [%u]", length); |
835315bf | 1474 | return bgp_attr_malformed (args, |
a624cae2 | 1475 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1476 | args->total); |
a624cae2 | 1477 | } |
0ea968d2 | 1478 | |
718e3744 | 1479 | /* If it is contained in an UPDATE message that is received from an |
1480 | external peer, then this attribute MUST be ignored by the | |
1481 | receiving speaker. */ | |
6d85b15b | 1482 | if (peer->sort == BGP_PEER_EBGP) |
718e3744 | 1483 | { |
9985f83c | 1484 | stream_forward_getp (peer->ibuf, length); |
b881c707 | 1485 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1486 | } |
1487 | ||
a624cae2 | 1488 | attr->local_pref = stream_getl (peer->ibuf); |
718e3744 | 1489 | |
1490 | /* Set atomic aggregate flag. */ | |
1491 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
1492 | ||
b881c707 | 1493 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1494 | } |
1495 | ||
1496 | /* Atomic aggregate. */ | |
94f2b392 | 1497 | static int |
835315bf | 1498 | bgp_attr_atomic (struct bgp_attr_parser_args *args) |
718e3744 | 1499 | { |
835315bf PJ |
1500 | struct attr *const attr = args->attr; |
1501 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1502 | |
9eba2ada | 1503 | /* Length check. */ |
718e3744 | 1504 | if (length != 0) |
1505 | { | |
16286195 | 1506 | zlog_err ("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", length); |
835315bf | 1507 | return bgp_attr_malformed (args, |
b881c707 | 1508 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1509 | args->total); |
718e3744 | 1510 | } |
1511 | ||
1512 | /* Set atomic aggregate flag. */ | |
1513 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
1514 | ||
b881c707 | 1515 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1516 | } |
1517 | ||
1518 | /* Aggregator attribute */ | |
94f2b392 | 1519 | static int |
835315bf | 1520 | bgp_attr_aggregator (struct bgp_attr_parser_args *args) |
718e3744 | 1521 | { |
835315bf PJ |
1522 | struct peer *const peer = args->peer; |
1523 | struct attr *const attr = args->attr; | |
1524 | const bgp_size_t length = args->length; | |
1525 | ||
0b2aa3a0 | 1526 | int wantedlen = 6; |
3ecab4c8 | 1527 | |
0b2aa3a0 | 1528 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ |
b881c707 | 1529 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1530 | wantedlen = 8; |
1531 | ||
1532 | if (length != wantedlen) | |
718e3744 | 1533 | { |
16286195 | 1534 | zlog_err ("AGGREGATOR attribute length isn't %u [%u]", wantedlen, length); |
835315bf | 1535 | return bgp_attr_malformed (args, |
b881c707 | 1536 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1537 | args->total); |
718e3744 | 1538 | } |
0b2aa3a0 PJ |
1539 | |
1540 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
aadc0905 | 1541 | attr->aggregator_as = stream_getl (peer->ibuf); |
0b2aa3a0 | 1542 | else |
aadc0905 DS |
1543 | attr->aggregator_as = stream_getw (peer->ibuf); |
1544 | attr->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); | |
718e3744 | 1545 | |
1546 | /* Set atomic aggregate flag. */ | |
1547 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1548 | ||
b881c707 | 1549 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1550 | } |
1551 | ||
0b2aa3a0 | 1552 | /* New Aggregator attribute */ |
b881c707 | 1553 | static bgp_attr_parse_ret_t |
835315bf PJ |
1554 | bgp_attr_as4_aggregator (struct bgp_attr_parser_args *args, |
1555 | as_t *as4_aggregator_as, | |
1556 | struct in_addr *as4_aggregator_addr) | |
0b2aa3a0 | 1557 | { |
835315bf PJ |
1558 | struct peer *const peer = args->peer; |
1559 | struct attr *const attr = args->attr; | |
1560 | const bgp_size_t length = args->length; | |
1561 | ||
0b2aa3a0 PJ |
1562 | if (length != 8) |
1563 | { | |
16286195 | 1564 | zlog_err ("New Aggregator length is not 8 [%d]", length); |
835315bf | 1565 | return bgp_attr_malformed (args, |
b881c707 | 1566 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1567 | 0); |
0b2aa3a0 | 1568 | } |
3ecab4c8 | 1569 | |
0b2aa3a0 PJ |
1570 | *as4_aggregator_as = stream_getl (peer->ibuf); |
1571 | as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf); | |
1572 | ||
1573 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR); | |
1574 | ||
b881c707 | 1575 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1576 | } |
1577 | ||
1578 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1579 | */ | |
b881c707 | 1580 | static bgp_attr_parse_ret_t |
835315bf PJ |
1581 | bgp_attr_munge_as4_attrs (struct peer *const peer, |
1582 | struct attr *const attr, | |
0b2aa3a0 PJ |
1583 | struct aspath *as4_path, as_t as4_aggregator, |
1584 | struct in_addr *as4_aggregator_addr) | |
1585 | { | |
1586 | int ignore_as4_path = 0; | |
1587 | struct aspath *newpath; | |
bb7bef14 PJ |
1588 | |
1589 | if (!attr->aspath) | |
1590 | { | |
1591 | /* NULL aspath shouldn't be possible as bgp_attr_parse should have | |
1592 | * checked that all well-known, mandatory attributes were present. | |
1593 | * | |
1594 | * Can only be a problem with peer itself - hard error | |
1595 | */ | |
1596 | return BGP_ATTR_PARSE_ERROR; | |
1597 | } | |
1598 | ||
b881c707 | 1599 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1600 | { |
1601 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1602 | * if given. | |
1603 | * It is worth a warning though, because the peer really | |
1604 | * should not send them | |
1605 | */ | |
1606 | if (BGP_DEBUG(as4, AS4)) | |
1607 | { | |
1608 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1609 | zlog_debug ("[AS4] %s %s AS4_PATH", | |
1610 | peer->host, "AS4 capable peer, yet it sent"); | |
1611 | ||
1612 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1613 | zlog_debug ("[AS4] %s %s AS4_AGGREGATOR", | |
1614 | peer->host, "AS4 capable peer, yet it sent"); | |
1615 | } | |
1616 | ||
b881c707 | 1617 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1618 | } |
1619 | ||
0b2aa3a0 PJ |
1620 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR |
1621 | * because that may override AS4_PATH | |
1622 | */ | |
1623 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) ) | |
1624 | { | |
b881c707 | 1625 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) ) |
0b2aa3a0 PJ |
1626 | { |
1627 | /* received both. | |
1628 | * if the as_number in aggregator is not AS_TRANS, | |
1629 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1630 | * and the Aggregator shall be taken as | |
1631 | * info on the aggregating node, and the AS_PATH | |
1632 | * shall be taken as the AS_PATH | |
1633 | * otherwise | |
1634 | * the Aggregator shall be ignored and the | |
1635 | * AS4_AGGREGATOR shall be taken as the | |
1636 | * Aggregating node and the AS_PATH is to be | |
1637 | * constructed "as in all other cases" | |
1638 | */ | |
aadc0905 | 1639 | if (attr->aggregator_as != BGP_AS_TRANS) |
0b2aa3a0 PJ |
1640 | { |
1641 | /* ignore */ | |
1642 | if ( BGP_DEBUG(as4, AS4)) | |
1643 | zlog_debug ("[AS4] %s BGP not AS4 capable peer" | |
1644 | " send AGGREGATOR != AS_TRANS and" | |
1645 | " AS4_AGGREGATOR, so ignore" | |
1646 | " AS4_AGGREGATOR and AS4_PATH", peer->host); | |
1647 | ignore_as4_path = 1; | |
1648 | } | |
1649 | else | |
1650 | { | |
1651 | /* "New_aggregator shall be taken as aggregator" */ | |
aadc0905 DS |
1652 | attr->aggregator_as = as4_aggregator; |
1653 | attr->aggregator_addr.s_addr = as4_aggregator_addr->s_addr; | |
0b2aa3a0 PJ |
1654 | } |
1655 | } | |
1656 | else | |
1657 | { | |
1658 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1659 | * That is bogus - but reading the conditions | |
1660 | * we have to handle AS4_AGGREGATOR as if it were | |
1661 | * AGGREGATOR in that case | |
1662 | */ | |
1663 | if ( BGP_DEBUG(as4, AS4)) | |
1664 | zlog_debug ("[AS4] %s BGP not AS4 capable peer send" | |
1665 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1666 | " it as if AGGREGATOR with AS_TRANS had been there", peer->host); | |
aadc0905 | 1667 | attr->aggregator_as = as4_aggregator; |
0b2aa3a0 PJ |
1668 | /* sweep it under the carpet and simulate a "good" AGGREGATOR */ |
1669 | attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)); | |
1670 | } | |
1671 | } | |
1672 | ||
1673 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
b881c707 | 1674 | if (!ignore_as4_path && (attr->flag & (ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH)))) |
0b2aa3a0 | 1675 | { |
bb7bef14 PJ |
1676 | newpath = aspath_reconcile_as4 (attr->aspath, as4_path); |
1677 | aspath_unintern (&attr->aspath); | |
1678 | attr->aspath = aspath_intern (newpath); | |
0b2aa3a0 | 1679 | } |
b881c707 | 1680 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1681 | } |
1682 | ||
718e3744 | 1683 | /* Community attribute. */ |
b881c707 | 1684 | static bgp_attr_parse_ret_t |
835315bf | 1685 | bgp_attr_community (struct bgp_attr_parser_args *args) |
718e3744 | 1686 | { |
835315bf PJ |
1687 | struct peer *const peer = args->peer; |
1688 | struct attr *const attr = args->attr; | |
1689 | const bgp_size_t length = args->length; | |
b881c707 | 1690 | |
718e3744 | 1691 | if (length == 0) |
b2ceea18 PJ |
1692 | { |
1693 | attr->community = NULL; | |
b881c707 | 1694 | return BGP_ATTR_PARSE_PROCEED; |
b2ceea18 | 1695 | } |
0c466381 PJ |
1696 | |
1697 | attr->community = | |
1698 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
1699 | ||
1700 | /* XXX: fix community_parse to use stream API and remove this */ | |
1701 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1702 | |
0c466381 | 1703 | if (!attr->community) |
835315bf | 1704 | return bgp_attr_malformed (args, |
b881c707 | 1705 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
835315bf | 1706 | args->total); |
0c466381 | 1707 | |
718e3744 | 1708 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); |
1709 | ||
b881c707 | 1710 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1711 | } |
1712 | ||
1713 | /* Originator ID attribute. */ | |
b881c707 | 1714 | static bgp_attr_parse_ret_t |
835315bf | 1715 | bgp_attr_originator_id (struct bgp_attr_parser_args *args) |
718e3744 | 1716 | { |
835315bf PJ |
1717 | struct peer *const peer = args->peer; |
1718 | struct attr *const attr = args->attr; | |
1719 | const bgp_size_t length = args->length; | |
1720 | ||
d595b566 | 1721 | /* Length check. */ |
718e3744 | 1722 | if (length != 4) |
1723 | { | |
16286195 | 1724 | zlog_err ("Bad originator ID length %d", length); |
718e3744 | 1725 | |
835315bf | 1726 | return bgp_attr_malformed (args, |
b881c707 | 1727 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1728 | args->total); |
718e3744 | 1729 | } |
1730 | ||
aadc0905 | 1731 | attr->originator_id.s_addr = stream_get_ipv4 (peer->ibuf); |
718e3744 | 1732 | |
1733 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
1734 | ||
b881c707 | 1735 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1736 | } |
1737 | ||
1738 | /* Cluster list attribute. */ | |
b881c707 | 1739 | static bgp_attr_parse_ret_t |
835315bf | 1740 | bgp_attr_cluster_list (struct bgp_attr_parser_args *args) |
718e3744 | 1741 | { |
835315bf PJ |
1742 | struct peer *const peer = args->peer; |
1743 | struct attr *const attr = args->attr; | |
1744 | const bgp_size_t length = args->length; | |
1745 | ||
718e3744 | 1746 | /* Check length. */ |
1747 | if (length % 4) | |
1748 | { | |
16286195 | 1749 | zlog_err ("Bad cluster list length %d", length); |
718e3744 | 1750 | |
835315bf PJ |
1751 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1752 | args->total); | |
718e3744 | 1753 | } |
1754 | ||
aadc0905 | 1755 | attr->cluster = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length); |
b881c707 PJ |
1756 | |
1757 | /* XXX: Fix cluster_parse to use stream API and then remove this */ | |
1758 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1759 | |
1760 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
1761 | ||
b881c707 | 1762 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1763 | } |
1764 | ||
1765 | /* Multiprotocol reachability information parse. */ | |
03292809 | 1766 | int |
835315bf PJ |
1767 | bgp_mp_reach_parse (struct bgp_attr_parser_args *args, |
1768 | struct bgp_nlri *mp_update) | |
718e3744 | 1769 | { |
b58ed1f8 DS |
1770 | iana_afi_t pkt_afi; |
1771 | afi_t afi; | |
9cabb64b | 1772 | safi_t pkt_safi, safi; |
718e3744 | 1773 | bgp_size_t nlri_len; |
6e4ab12f | 1774 | size_t start; |
718e3744 | 1775 | struct stream *s; |
835315bf PJ |
1776 | struct peer *const peer = args->peer; |
1777 | struct attr *const attr = args->attr; | |
1778 | const bgp_size_t length = args->length; | |
835315bf | 1779 | |
718e3744 | 1780 | /* Set end of packet. */ |
6e4ab12f PJ |
1781 | s = BGP_INPUT(peer); |
1782 | start = stream_get_getp(s); | |
1783 | ||
1784 | /* safe to read statically sized header? */ | |
1785 | #define BGP_MP_REACH_MIN_SIZE 5 | |
03292809 | 1786 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
6e4ab12f | 1787 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) |
03292809 PJ |
1788 | { |
1789 | zlog_info ("%s: %s sent invalid length, %lu", | |
1790 | __func__, peer->host, (unsigned long)length); | |
f57000c0 | 1791 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1792 | } |
6e4ab12f | 1793 | |
718e3744 | 1794 | /* Load AFI, SAFI. */ |
9cabb64b | 1795 | pkt_afi = stream_getw (s); |
1796 | pkt_safi = stream_getc (s); | |
1797 | ||
1798 | /* Convert AFI, SAFI to internal values, check. */ | |
1799 | if (bgp_map_afi_safi_iana2int (pkt_afi, pkt_safi, &afi, &safi)) | |
1800 | { | |
1801 | /* Log if AFI or SAFI is unrecognized. This is not an error unless | |
1802 | * the attribute is otherwise malformed. | |
1803 | */ | |
1804 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1805 | zlog_debug ("%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1806 | peer->host, pkt_afi, pkt_safi); | |
1807 | return BGP_ATTR_PARSE_ERROR; | |
1808 | } | |
718e3744 | 1809 | |
1810 | /* Get nexthop length. */ | |
aadc0905 | 1811 | attr->mp_nexthop_len = stream_getc (s); |
6e4ab12f | 1812 | |
aadc0905 | 1813 | if (LEN_LEFT < attr->mp_nexthop_len) |
03292809 PJ |
1814 | { |
1815 | zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute", | |
aadc0905 | 1816 | __func__, peer->host, attr->mp_nexthop_len); |
f57000c0 | 1817 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1818 | } |
6e4ab12f | 1819 | |
718e3744 | 1820 | /* Nexthop length check. */ |
aadc0905 | 1821 | switch (attr->mp_nexthop_len) |
718e3744 | 1822 | { |
801a9bcc | 1823 | case BGP_ATTR_NHLEN_IPV4: |
aadc0905 | 1824 | stream_get (&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); |
66bed4f4 ML |
1825 | /* Probably needed for RFC 2283 */ |
1826 | if (attr->nexthop.s_addr == 0) | |
aadc0905 | 1827 | memcpy(&attr->nexthop.s_addr, &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); |
718e3744 | 1828 | break; |
801a9bcc | 1829 | case BGP_ATTR_NHLEN_VPNV4: |
9206f9ec SH |
1830 | stream_getl (s); /* RD high */ |
1831 | stream_getl (s); /* RD low */ | |
aadc0905 | 1832 | stream_get (&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); |
718e3744 | 1833 | break; |
801a9bcc | 1834 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
945c8fe9 | 1835 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: |
aadc0905 | 1836 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) |
945c8fe9 LB |
1837 | { |
1838 | stream_getl (s); /* RD high */ | |
1839 | stream_getl (s); /* RD low */ | |
1840 | } | |
aadc0905 | 1841 | stream_get (&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); |
718e3744 | 1842 | break; |
801a9bcc | 1843 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: |
945c8fe9 | 1844 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: |
aadc0905 | 1845 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) |
945c8fe9 LB |
1846 | { |
1847 | stream_getl (s); /* RD high */ | |
1848 | stream_getl (s); /* RD low */ | |
1849 | } | |
aadc0905 DS |
1850 | stream_get (&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); |
1851 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) | |
945c8fe9 LB |
1852 | { |
1853 | stream_getl (s); /* RD high */ | |
1854 | stream_getl (s); /* RD low */ | |
1855 | } | |
aadc0905 DS |
1856 | stream_get (&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); |
1857 | if (! IN6_IS_ADDR_LINKLOCAL (&attr->mp_nexthop_local)) | |
718e3744 | 1858 | { |
1859 | char buf1[INET6_ADDRSTRLEN]; | |
1860 | char buf2[INET6_ADDRSTRLEN]; | |
1861 | ||
3f9c7369 | 1862 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3dd32081 DS |
1863 | zlog_debug ("%s rcvd nexthops %s, %s -- ignoring non-LL value", |
1864 | peer->host, | |
aadc0905 | 1865 | inet_ntop (AF_INET6, &attr->mp_nexthop_global, |
718e3744 | 1866 | buf1, INET6_ADDRSTRLEN), |
aadc0905 | 1867 | inet_ntop (AF_INET6, &attr->mp_nexthop_local, |
718e3744 | 1868 | buf2, INET6_ADDRSTRLEN)); |
1869 | ||
aadc0905 | 1870 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 1871 | } |
1872 | break; | |
718e3744 | 1873 | default: |
03292809 | 1874 | zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d", |
aadc0905 | 1875 | __func__, peer->host, attr->mp_nexthop_len); |
f57000c0 | 1876 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
718e3744 | 1877 | } |
1878 | ||
03292809 PJ |
1879 | if (!LEN_LEFT) |
1880 | { | |
1881 | zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)", | |
1882 | __func__, peer->host); | |
f57000c0 | 1883 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1884 | } |
718e3744 | 1885 | |
6e4ab12f PJ |
1886 | { |
1887 | u_char val; | |
1888 | if ((val = stream_getc (s))) | |
1889 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
1890 | peer->host, val); | |
1891 | } | |
1892 | ||
1893 | /* must have nrli_len, what is left of the attribute */ | |
03292809 | 1894 | nlri_len = LEN_LEFT; |
6e4ab12f | 1895 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) |
03292809 PJ |
1896 | { |
1897 | zlog_info ("%s: (%s) Failed to read NLRI", | |
1898 | __func__, peer->host); | |
f57000c0 | 1899 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1900 | } |
718e3744 | 1901 | |
1902 | mp_update->afi = afi; | |
1903 | mp_update->safi = safi; | |
1904 | mp_update->nlri = stream_pnt (s); | |
1905 | mp_update->length = nlri_len; | |
1906 | ||
9985f83c | 1907 | stream_forward_getp (s, nlri_len); |
718e3744 | 1908 | |
37da8fa9 DL |
1909 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MP_REACH_NLRI); |
1910 | ||
b881c707 | 1911 | return BGP_ATTR_PARSE_PROCEED; |
03292809 | 1912 | #undef LEN_LEFT |
718e3744 | 1913 | } |
1914 | ||
1915 | /* Multiprotocol unreachable parse */ | |
03292809 | 1916 | int |
835315bf | 1917 | bgp_mp_unreach_parse (struct bgp_attr_parser_args *args, |
718e3744 | 1918 | struct bgp_nlri *mp_withdraw) |
1919 | { | |
1920 | struct stream *s; | |
b58ed1f8 | 1921 | iana_afi_t pkt_afi; |
4c9641ba | 1922 | afi_t afi; |
9cabb64b | 1923 | safi_t pkt_safi, safi; |
718e3744 | 1924 | u_int16_t withdraw_len; |
835315bf | 1925 | struct peer *const peer = args->peer; |
37da8fa9 | 1926 | struct attr *const attr = args->attr; |
835315bf | 1927 | const bgp_size_t length = args->length; |
718e3744 | 1928 | |
1929 | s = peer->ibuf; | |
6e4ab12f PJ |
1930 | |
1931 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
1932 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
f57000c0 | 1933 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
6e4ab12f | 1934 | |
9cabb64b | 1935 | pkt_afi = stream_getw (s); |
1936 | pkt_safi = stream_getc (s); | |
1937 | ||
1938 | /* Convert AFI, SAFI to internal values, check. */ | |
1939 | if (bgp_map_afi_safi_iana2int (pkt_afi, pkt_safi, &afi, &safi)) | |
1940 | { | |
1941 | /* Log if AFI or SAFI is unrecognized. This is not an error unless | |
1942 | * the attribute is otherwise malformed. | |
1943 | */ | |
1944 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1945 | zlog_debug ("%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
1946 | peer->host, pkt_afi, pkt_safi); | |
1947 | return BGP_ATTR_PARSE_ERROR; | |
1948 | } | |
1949 | ||
6e4ab12f | 1950 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 1951 | |
718e3744 | 1952 | mp_withdraw->afi = afi; |
1953 | mp_withdraw->safi = safi; | |
1954 | mp_withdraw->nlri = stream_pnt (s); | |
1955 | mp_withdraw->length = withdraw_len; | |
1956 | ||
9985f83c | 1957 | stream_forward_getp (s, withdraw_len); |
718e3744 | 1958 | |
37da8fa9 DL |
1959 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI); |
1960 | ||
b881c707 | 1961 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1962 | } |
1963 | ||
57d187bc JS |
1964 | /* Large Community attribute. */ |
1965 | static bgp_attr_parse_ret_t | |
1966 | bgp_attr_large_community (struct bgp_attr_parser_args *args) | |
1967 | { | |
1968 | struct peer *const peer = args->peer; | |
1969 | struct attr *const attr = args->attr; | |
1970 | const bgp_size_t length = args->length; | |
1971 | ||
1972 | /* | |
1973 | * Large community follows new attribute format. | |
1974 | */ | |
1975 | if (length == 0) | |
1976 | { | |
aadc0905 | 1977 | attr->lcommunity = NULL; |
57d187bc JS |
1978 | /* Empty extcomm doesn't seem to be invalid per se */ |
1979 | return BGP_ATTR_PARSE_PROCEED; | |
1980 | } | |
1981 | ||
aadc0905 | 1982 | attr->lcommunity = lcommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); |
57d187bc JS |
1983 | /* XXX: fix ecommunity_parse to use stream API */ |
1984 | stream_forward_getp (peer->ibuf, length); | |
1985 | ||
aadc0905 | 1986 | if (!attr->lcommunity) |
57d187bc JS |
1987 | return bgp_attr_malformed (args, |
1988 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1989 | args->total); | |
1990 | ||
1991 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES); | |
1992 | ||
1993 | return BGP_ATTR_PARSE_PROCEED; | |
1994 | } | |
1995 | ||
718e3744 | 1996 | /* Extended Community attribute. */ |
b881c707 | 1997 | static bgp_attr_parse_ret_t |
835315bf | 1998 | bgp_attr_ext_communities (struct bgp_attr_parser_args *args) |
718e3744 | 1999 | { |
835315bf PJ |
2000 | struct peer *const peer = args->peer; |
2001 | struct attr *const attr = args->attr; | |
2002 | const bgp_size_t length = args->length; | |
c85c03c7 | 2003 | u_char sticky = 0; |
b881c707 | 2004 | |
718e3744 | 2005 | if (length == 0) |
fb982c25 | 2006 | { |
aadc0905 | 2007 | attr->ecommunity = NULL; |
0c466381 | 2008 | /* Empty extcomm doesn't seem to be invalid per se */ |
b881c707 | 2009 | return BGP_ATTR_PARSE_PROCEED; |
fb982c25 | 2010 | } |
0c466381 | 2011 | |
aadc0905 | 2012 | attr->ecommunity = ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); |
0c466381 PJ |
2013 | /* XXX: fix ecommunity_parse to use stream API */ |
2014 | stream_forward_getp (peer->ibuf, length); | |
2015 | ||
aadc0905 | 2016 | if (!attr->ecommunity) |
835315bf PJ |
2017 | return bgp_attr_malformed (args, |
2018 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2019 | args->total); | |
0c466381 | 2020 | |
718e3744 | 2021 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); |
2022 | ||
128ea8ab | 2023 | /* Extract MAC mobility sequence number, if any. */ |
aadc0905 DS |
2024 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum (attr, &sticky); |
2025 | attr->sticky = sticky; | |
128ea8ab | 2026 | |
b881c707 | 2027 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2028 | } |
2029 | ||
f4c89855 LB |
2030 | /* Parse Tunnel Encap attribute in an UPDATE */ |
2031 | static int | |
2032 | bgp_attr_encap( | |
2033 | uint8_t type, | |
2034 | struct peer *peer, /* IN */ | |
2035 | bgp_size_t length, /* IN: attr's length field */ | |
2036 | struct attr *attr, /* IN: caller already allocated */ | |
2037 | u_char flag, /* IN: attr's flags field */ | |
2038 | u_char *startp) | |
2039 | { | |
2040 | bgp_size_t total; | |
f4c89855 | 2041 | struct bgp_attr_encap_subtlv *stlv_last = NULL; |
2de1475f | 2042 | uint16_t tunneltype = 0; |
f4c89855 LB |
2043 | |
2044 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2045 | ||
2046 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2047 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) | |
2048 | { | |
2049 | zlog_info ("Tunnel Encap attribute flag isn't optional and transitive %d", flag); | |
2050 | bgp_notify_send_with_data (peer, | |
2051 | BGP_NOTIFY_UPDATE_ERR, | |
2052 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2053 | startp, total); | |
2054 | return -1; | |
2055 | } | |
2056 | ||
2057 | if (BGP_ATTR_ENCAP == type) { | |
2058 | /* read outer TLV type and length */ | |
2059 | uint16_t tlv_length; | |
2060 | ||
2061 | if (length < 4) { | |
2062 | zlog_info ("Tunnel Encap attribute not long enough to contain outer T,L"); | |
2063 | bgp_notify_send_with_data(peer, | |
2064 | BGP_NOTIFY_UPDATE_ERR, | |
2065 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2066 | startp, total); | |
2067 | return -1; | |
2068 | } | |
2069 | tunneltype = stream_getw (BGP_INPUT (peer)); | |
2070 | tlv_length = stream_getw (BGP_INPUT (peer)); | |
2071 | length -= 4; | |
2072 | ||
2073 | if (tlv_length != length) { | |
2074 | zlog_info ("%s: tlv_length(%d) != length(%d)", | |
2075 | __func__, tlv_length, length); | |
2076 | } | |
2077 | } | |
2078 | ||
2079 | while (length >= 4) { | |
0f2b4f4d | 2080 | uint16_t subtype = 0; |
f4cafc65 | 2081 | uint16_t sublength = 0; |
f4c89855 LB |
2082 | struct bgp_attr_encap_subtlv *tlv; |
2083 | ||
587ff0fd LB |
2084 | if (BGP_ATTR_ENCAP == type) { |
2085 | subtype = stream_getc (BGP_INPUT (peer)); | |
2086 | sublength = stream_getc (BGP_INPUT (peer)); | |
2087 | length -= 2; | |
65efcfce LB |
2088 | #if ENABLE_BGP_VNC |
2089 | } else { | |
2090 | subtype = stream_getw (BGP_INPUT (peer)); | |
2091 | sublength = stream_getw (BGP_INPUT (peer)); | |
2092 | length -= 4; | |
2093 | #endif | |
587ff0fd | 2094 | } |
f4c89855 LB |
2095 | |
2096 | if (sublength > length) { | |
2097 | zlog_info ("Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2098 | sublength, length); | |
2099 | bgp_notify_send_with_data (peer, | |
2100 | BGP_NOTIFY_UPDATE_ERR, | |
2101 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2102 | startp, total); | |
2103 | return -1; | |
2104 | } | |
2105 | ||
2106 | /* alloc and copy sub-tlv */ | |
2107 | /* TBD make sure these are freed when attributes are released */ | |
2108 | tlv = XCALLOC (MTYPE_ENCAP_TLV, sizeof(struct bgp_attr_encap_subtlv)-1+sublength); | |
2109 | tlv->type = subtype; | |
2110 | tlv->length = sublength; | |
2111 | stream_get(tlv->value, peer->ibuf, sublength); | |
2112 | length -= sublength; | |
2113 | ||
2114 | /* attach tlv to encap chain */ | |
aadc0905 DS |
2115 | if (BGP_ATTR_ENCAP == type) { |
2116 | for (stlv_last = attr->encap_subtlvs; stlv_last && stlv_last->next; | |
2117 | stlv_last = stlv_last->next); | |
2118 | if (stlv_last) { | |
2119 | stlv_last->next = tlv; | |
2120 | } else { | |
2121 | attr->encap_subtlvs = tlv; | |
2122 | } | |
65efcfce | 2123 | #if ENABLE_BGP_VNC |
f4c89855 | 2124 | } else { |
aadc0905 DS |
2125 | for (stlv_last = attr->vnc_subtlvs; stlv_last && stlv_last->next; |
2126 | stlv_last = stlv_last->next); | |
2127 | if (stlv_last) { | |
2128 | stlv_last->next = tlv; | |
2129 | } else { | |
2130 | attr->vnc_subtlvs = tlv; | |
2131 | } | |
2132 | #endif | |
f4c89855 | 2133 | } |
aadc0905 | 2134 | stlv_last->next = tlv; |
f4c89855 LB |
2135 | } |
2136 | ||
ac73d8fb | 2137 | if (BGP_ATTR_ENCAP == type) { |
aadc0905 | 2138 | attr->encap_tunneltype = tunneltype; |
f4c89855 LB |
2139 | } |
2140 | ||
2141 | if (length) { | |
2142 | /* spurious leftover data */ | |
2143 | zlog_info ("Tunnel Encap attribute length is bad: %d leftover octets", length); | |
2144 | bgp_notify_send_with_data (peer, | |
2145 | BGP_NOTIFY_UPDATE_ERR, | |
2146 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2147 | startp, total); | |
2148 | return -1; | |
2149 | } | |
2150 | ||
2151 | return 0; | |
2152 | } | |
2153 | ||
c5a543b4 DW |
2154 | /* Prefix SID attribute |
2155 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2156 | */ | |
6cf48acc | 2157 | static bgp_attr_parse_ret_t |
c5a543b4 | 2158 | bgp_attr_prefix_sid (struct bgp_attr_parser_args *args, struct bgp_nlri *mp_update) |
6cf48acc VV |
2159 | { |
2160 | struct peer *const peer = args->peer; | |
2161 | struct attr *const attr = args->attr; | |
c5a543b4 DW |
2162 | int type; |
2163 | int length; | |
6cf48acc | 2164 | u_int32_t label_index; |
c5a543b4 DW |
2165 | struct in6_addr ipv6_sid; |
2166 | u_int32_t srgb_base; | |
2167 | u_int32_t srgb_range; | |
2168 | int srgb_count; | |
6cf48acc | 2169 | |
c5a543b4 DW |
2170 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_PREFIX_SID); |
2171 | ||
2172 | type = stream_getc (peer->ibuf); | |
2173 | length = stream_getw (peer->ibuf); | |
2174 | ||
2175 | if (type == BGP_PREFIX_SID_LABEL_INDEX) | |
6cf48acc | 2176 | { |
c5a543b4 DW |
2177 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) |
2178 | { | |
2179 | zlog_err ("Prefix SID label index length is %d instead of %d", length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
2180 | return bgp_attr_malformed (args, | |
2181 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2182 | args->total); | |
2183 | } | |
6cf48acc | 2184 | |
c5a543b4 DW |
2185 | /* Ignore flags and reserved */ |
2186 | stream_getc (peer->ibuf); | |
2187 | stream_getw (peer->ibuf); | |
6cf48acc | 2188 | |
c5a543b4 DW |
2189 | /* Fetch the label index and see if it is valid. */ |
2190 | label_index = stream_getl (peer->ibuf); | |
2191 | if (label_index == BGP_INVALID_LABEL_INDEX) | |
2192 | return bgp_attr_malformed (args, | |
2193 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2194 | args->total); | |
6cf48acc | 2195 | |
c5a543b4 | 2196 | /* Store label index; subsequently, we'll check on address-family */ |
aadc0905 | 2197 | attr->label_index = label_index; |
c5a543b4 DW |
2198 | |
2199 | /* | |
2200 | * Ignore the Label index attribute unless received for labeled-unicast | |
2201 | * SAFI. | |
2202 | */ | |
2203 | if (!mp_update->length || mp_update->safi != SAFI_LABELED_UNICAST) | |
aadc0905 | 2204 | attr->label_index = BGP_INVALID_LABEL_INDEX; |
c5a543b4 | 2205 | } |
6cf48acc | 2206 | |
c5a543b4 DW |
2207 | /* Placeholder code for the IPv6 SID type */ |
2208 | else if (type == BGP_PREFIX_SID_IPV6) | |
2209 | { | |
2210 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) | |
2211 | { | |
2212 | zlog_err ("Prefix SID IPv6 length is %d instead of %d", length, BGP_PREFIX_SID_IPV6_LENGTH); | |
2213 | return bgp_attr_malformed (args, | |
2214 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2215 | args->total); | |
2216 | } | |
6cf48acc | 2217 | |
c5a543b4 DW |
2218 | /* Ignore reserved */ |
2219 | stream_getc (peer->ibuf); | |
2220 | stream_getw (peer->ibuf); | |
6cf48acc | 2221 | |
c5a543b4 DW |
2222 | stream_get (&ipv6_sid, peer->ibuf, 16); |
2223 | } | |
2224 | ||
2225 | /* Placeholder code for the Originator SRGB type */ | |
2226 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) | |
6cf48acc | 2227 | { |
c5a543b4 DW |
2228 | /* Ignore flags */ |
2229 | stream_getw (peer->ibuf); | |
2230 | ||
2231 | length -= 2; | |
2232 | ||
2233 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) | |
2234 | { | |
2235 | zlog_err ("Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", | |
2236 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2237 | return bgp_attr_malformed (args, | |
2238 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2239 | args->total); | |
2240 | } | |
2241 | ||
2242 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2243 | ||
2244 | for (int i = 0; i < srgb_count; i++) | |
2245 | { | |
2246 | stream_get (&srgb_base, peer->ibuf, 3); | |
2247 | stream_get (&srgb_range, peer->ibuf, 3); | |
2248 | } | |
6cf48acc | 2249 | } |
c5a543b4 | 2250 | |
6cf48acc VV |
2251 | return BGP_ATTR_PARSE_PROCEED; |
2252 | } | |
2253 | ||
718e3744 | 2254 | /* BGP unknown attribute treatment. */ |
b881c707 | 2255 | static bgp_attr_parse_ret_t |
835315bf | 2256 | bgp_attr_unknown (struct bgp_attr_parser_args *args) |
718e3744 | 2257 | { |
8794e8d2 | 2258 | bgp_size_t total = args->total; |
718e3744 | 2259 | struct transit *transit; |
835315bf PJ |
2260 | struct peer *const peer = args->peer; |
2261 | struct attr *const attr = args->attr; | |
2262 | u_char *const startp = args->startp; | |
2263 | const u_char type = args->type; | |
2264 | const u_char flag = args->flags; | |
2265 | const bgp_size_t length = args->length; | |
2266 | ||
3f9c7369 | 2267 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
16286195 DS |
2268 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", |
2269 | peer->host, type, length); | |
f418446b | 2270 | |
718e3744 | 2271 | /* Forward read pointer of input stream. */ |
9985f83c | 2272 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 2273 | |
718e3744 | 2274 | /* If any of the mandatory well-known attributes are not recognized, |
2275 | then the Error Subcode is set to Unrecognized Well-known | |
2276 | Attribute. The Data field contains the unrecognized attribute | |
2277 | (type, length and value). */ | |
b881c707 | 2278 | if (!CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) |
718e3744 | 2279 | { |
835315bf | 2280 | return bgp_attr_malformed (args, |
b881c707 | 2281 | BGP_NOTIFY_UPDATE_UNREC_ATTR, |
835315bf | 2282 | args->total); |
718e3744 | 2283 | } |
2284 | ||
2285 | /* Unrecognized non-transitive optional attributes must be quietly | |
2286 | ignored and not passed along to other BGP peers. */ | |
2287 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
b881c707 | 2288 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2289 | |
2290 | /* If a path with recognized transitive optional attribute is | |
2291 | accepted and passed along to other BGP peers and the Partial bit | |
2292 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2293 | is not set back to 0 by the current AS. */ | |
2294 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
2295 | ||
2296 | /* Store transitive attribute to the end of attr->transit. */ | |
aadc0905 DS |
2297 | if (!attr->transit) |
2298 | attr->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); | |
718e3744 | 2299 | |
aadc0905 | 2300 | transit = attr->transit; |
718e3744 | 2301 | |
2302 | if (transit->val) | |
2303 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
2304 | transit->length + total); | |
2305 | else | |
2306 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
2307 | ||
2308 | memcpy (transit->val + transit->length, startp, total); | |
2309 | transit->length += total; | |
2310 | ||
b881c707 | 2311 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2312 | } |
2313 | ||
bb7bef14 PJ |
2314 | /* Well-known attribute check. */ |
2315 | static int | |
52a51fd3 | 2316 | bgp_attr_check (struct peer *peer, struct attr *attr) |
bb7bef14 PJ |
2317 | { |
2318 | u_char type = 0; | |
2319 | ||
67495ddb PJ |
2320 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an |
2321 | * empty UPDATE. */ | |
2322 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2323 | return BGP_ATTR_PARSE_PROCEED; | |
2324 | ||
2325 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2326 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2327 | are present, it should. Check for any other attribute being present | |
2328 | instead. | |
2329 | */ | |
2330 | if (attr->flag == ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI)) | |
2331 | return BGP_ATTR_PARSE_PROCEED; | |
2332 | ||
bb7bef14 PJ |
2333 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) |
2334 | type = BGP_ATTR_ORIGIN; | |
2335 | ||
2336 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
2337 | type = BGP_ATTR_AS_PATH; | |
2338 | ||
52a51fd3 DW |
2339 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present and |
2340 | * NLRI is empty. We can't easily check NLRI empty here though. | |
bb7bef14 | 2341 | */ |
52a51fd3 DW |
2342 | if (!CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
2343 | && !CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_MP_REACH_NLRI))) | |
2344 | type = BGP_ATTR_NEXT_HOP; | |
bb7bef14 PJ |
2345 | |
2346 | if (peer->sort == BGP_PEER_IBGP | |
2347 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) | |
2348 | type = BGP_ATTR_LOCAL_PREF; | |
2349 | ||
2350 | if (type) | |
2351 | { | |
52a51fd3 | 2352 | zlog_warn ("%s Missing well-known attribute %s.", peer->host, |
56b40679 | 2353 | lookup_msg(attr_str, type, NULL)); |
bb7bef14 PJ |
2354 | bgp_notify_send_with_data (peer, |
2355 | BGP_NOTIFY_UPDATE_ERR, | |
2356 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
2357 | &type, 1); | |
2358 | return BGP_ATTR_PARSE_ERROR; | |
2359 | } | |
2360 | return BGP_ATTR_PARSE_PROCEED; | |
2361 | } | |
2362 | ||
718e3744 | 2363 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2364 | bgp_update_receive() in bgp_packet.c. */ |
b881c707 | 2365 | bgp_attr_parse_ret_t |
718e3744 | 2366 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, |
52a51fd3 | 2367 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) |
718e3744 | 2368 | { |
2369 | int ret; | |
b881c707 | 2370 | u_char flag = 0; |
0b2aa3a0 | 2371 | u_char type = 0; |
718e3744 | 2372 | bgp_size_t length; |
2373 | u_char *startp, *endp; | |
2374 | u_char *attr_endp; | |
2375 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
0b2aa3a0 PJ |
2376 | /* we need the as4_path only until we have synthesized the as_path with it */ |
2377 | /* same goes for as4_aggregator */ | |
2378 | struct aspath *as4_path = NULL; | |
2379 | as_t as4_aggregator = 0; | |
19c3598b | 2380 | struct in_addr as4_aggregator_addr = { .s_addr = 0 }; |
718e3744 | 2381 | |
2382 | /* Initialize bitmap. */ | |
2383 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2384 | ||
2385 | /* End pointer of BGP attribute. */ | |
2386 | endp = BGP_INPUT_PNT (peer) + size; | |
b881c707 | 2387 | |
718e3744 | 2388 | /* Get attributes to the end of attribute length. */ |
2389 | while (BGP_INPUT_PNT (peer) < endp) | |
2390 | { | |
2391 | /* Check remaining length check.*/ | |
2392 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
2393 | { | |
c29fdba7 | 2394 | /* XXX warning: long int format, int arg (arg 5) */ |
16286195 DS |
2395 | zlog_warn ("%s: error BGP attribute length %lu is smaller than min len", |
2396 | peer->host, | |
2397 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
718e3744 | 2398 | |
2399 | bgp_notify_send (peer, | |
2400 | BGP_NOTIFY_UPDATE_ERR, | |
2401 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 2402 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2403 | } |
2404 | ||
2405 | /* Fetch attribute flag and type. */ | |
2406 | startp = BGP_INPUT_PNT (peer); | |
2d42e68a DO |
2407 | /* "The lower-order four bits of the Attribute Flags octet are |
2408 | unused. They MUST be zero when sent and MUST be ignored when | |
2409 | received." */ | |
2410 | flag = 0xF0 & stream_getc (BGP_INPUT (peer)); | |
718e3744 | 2411 | type = stream_getc (BGP_INPUT (peer)); |
2412 | ||
370b64a2 PJ |
2413 | /* Check whether Extended-Length applies and is in bounds */ |
2414 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) | |
2415 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) | |
2416 | { | |
16286195 DS |
2417 | zlog_warn ("%s: Extended length set, but just %lu bytes of attr header", |
2418 | peer->host, | |
2419 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
370b64a2 PJ |
2420 | |
2421 | bgp_notify_send (peer, | |
2422 | BGP_NOTIFY_UPDATE_ERR, | |
2423 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 2424 | return BGP_ATTR_PARSE_ERROR; |
370b64a2 | 2425 | } |
835315bf | 2426 | |
718e3744 | 2427 | /* Check extended attribue length bit. */ |
2428 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
2429 | length = stream_getw (BGP_INPUT (peer)); | |
2430 | else | |
2431 | length = stream_getc (BGP_INPUT (peer)); | |
2432 | ||
2433 | /* If any attribute appears more than once in the UPDATE | |
2434 | message, then the Error Subcode is set to Malformed Attribute | |
2435 | List. */ | |
2436 | ||
2437 | if (CHECK_BITMAP (seen, type)) | |
2438 | { | |
16286195 DS |
2439 | zlog_warn ("%s: error BGP attribute type %d appears twice in a message", |
2440 | peer->host, type); | |
718e3744 | 2441 | |
2442 | bgp_notify_send (peer, | |
2443 | BGP_NOTIFY_UPDATE_ERR, | |
2444 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 | 2445 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2446 | } |
2447 | ||
2448 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2449 | unsigned char so it never overflow bitmap range. */ | |
2450 | ||
2451 | SET_BITMAP (seen, type); | |
2452 | ||
2453 | /* Overflow check. */ | |
2454 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
2455 | ||
2456 | if (attr_endp > endp) | |
2457 | { | |
16286195 | 2458 | zlog_warn ("%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", peer->host, type, length, size, attr_endp, endp); |
b184ccd8 DS |
2459 | bgp_notify_send_with_data (peer, |
2460 | BGP_NOTIFY_UPDATE_ERR, | |
2461 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2462 | startp, attr_endp - startp); | |
b881c707 | 2463 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2464 | } |
835315bf PJ |
2465 | |
2466 | struct bgp_attr_parser_args attr_args = { | |
2467 | .peer = peer, | |
2468 | .length = length, | |
2469 | .attr = attr, | |
2470 | .type = type, | |
2471 | .flags = flag, | |
2472 | .startp = startp, | |
2473 | .total = attr_endp - startp, | |
2474 | }; | |
2475 | ||
2476 | ||
2477 | /* If any recognized attribute has Attribute Flags that conflict | |
2478 | with the Attribute Type Code, then the Error Subcode is set to | |
2479 | Attribute Flags Error. The Data field contains the erroneous | |
2480 | attribute (type, length and value). */ | |
2481 | if (bgp_attr_flag_invalid (&attr_args)) | |
fa61e16d PJ |
2482 | { |
2483 | bgp_attr_parse_ret_t ret; | |
2484 | ret = bgp_attr_malformed (&attr_args, | |
2485 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2486 | attr_args.total); | |
2487 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2488 | continue; | |
2489 | return ret; | |
2490 | } | |
718e3744 | 2491 | |
2492 | /* OK check attribute and store it's value. */ | |
2493 | switch (type) | |
2494 | { | |
2495 | case BGP_ATTR_ORIGIN: | |
835315bf | 2496 | ret = bgp_attr_origin (&attr_args); |
718e3744 | 2497 | break; |
2498 | case BGP_ATTR_AS_PATH: | |
835315bf | 2499 | ret = bgp_attr_aspath (&attr_args); |
718e3744 | 2500 | break; |
0b2aa3a0 | 2501 | case BGP_ATTR_AS4_PATH: |
835315bf | 2502 | ret = bgp_attr_as4_path (&attr_args, &as4_path); |
0b2aa3a0 | 2503 | break; |
718e3744 | 2504 | case BGP_ATTR_NEXT_HOP: |
835315bf | 2505 | ret = bgp_attr_nexthop (&attr_args); |
718e3744 | 2506 | break; |
2507 | case BGP_ATTR_MULTI_EXIT_DISC: | |
835315bf | 2508 | ret = bgp_attr_med (&attr_args); |
718e3744 | 2509 | break; |
2510 | case BGP_ATTR_LOCAL_PREF: | |
835315bf | 2511 | ret = bgp_attr_local_pref (&attr_args); |
718e3744 | 2512 | break; |
2513 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
835315bf | 2514 | ret = bgp_attr_atomic (&attr_args); |
718e3744 | 2515 | break; |
2516 | case BGP_ATTR_AGGREGATOR: | |
835315bf | 2517 | ret = bgp_attr_aggregator (&attr_args); |
718e3744 | 2518 | break; |
0b2aa3a0 | 2519 | case BGP_ATTR_AS4_AGGREGATOR: |
835315bf PJ |
2520 | ret = bgp_attr_as4_aggregator (&attr_args, |
2521 | &as4_aggregator, | |
2522 | &as4_aggregator_addr); | |
0b2aa3a0 | 2523 | break; |
718e3744 | 2524 | case BGP_ATTR_COMMUNITIES: |
835315bf | 2525 | ret = bgp_attr_community (&attr_args); |
718e3744 | 2526 | break; |
57d187bc JS |
2527 | case BGP_ATTR_LARGE_COMMUNITIES: |
2528 | ret = bgp_attr_large_community (&attr_args); | |
2529 | break; | |
718e3744 | 2530 | case BGP_ATTR_ORIGINATOR_ID: |
835315bf | 2531 | ret = bgp_attr_originator_id (&attr_args); |
718e3744 | 2532 | break; |
2533 | case BGP_ATTR_CLUSTER_LIST: | |
835315bf | 2534 | ret = bgp_attr_cluster_list (&attr_args); |
718e3744 | 2535 | break; |
2536 | case BGP_ATTR_MP_REACH_NLRI: | |
835315bf | 2537 | ret = bgp_mp_reach_parse (&attr_args, mp_update); |
718e3744 | 2538 | break; |
2539 | case BGP_ATTR_MP_UNREACH_NLRI: | |
835315bf | 2540 | ret = bgp_mp_unreach_parse (&attr_args, mp_withdraw); |
718e3744 | 2541 | break; |
2542 | case BGP_ATTR_EXT_COMMUNITIES: | |
835315bf | 2543 | ret = bgp_attr_ext_communities (&attr_args); |
718e3744 | 2544 | break; |
65efcfce LB |
2545 | #if ENABLE_BGP_VNC |
2546 | case BGP_ATTR_VNC: | |
2547 | #endif | |
f4c89855 LB |
2548 | case BGP_ATTR_ENCAP: |
2549 | ret = bgp_attr_encap (type, peer, length, attr, flag, startp); | |
2550 | break; | |
c5a543b4 DW |
2551 | case BGP_ATTR_PREFIX_SID: |
2552 | ret = bgp_attr_prefix_sid (&attr_args, mp_update); | |
6cf48acc | 2553 | break; |
718e3744 | 2554 | default: |
835315bf | 2555 | ret = bgp_attr_unknown (&attr_args); |
718e3744 | 2556 | break; |
2557 | } | |
b881c707 | 2558 | |
f57000c0 DL |
2559 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) |
2560 | { | |
2561 | bgp_notify_send (peer, | |
2562 | BGP_NOTIFY_UPDATE_ERR, | |
2563 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2564 | ret = BGP_ATTR_PARSE_ERROR; | |
2565 | } | |
2566 | ||
b881c707 PJ |
2567 | /* If hard error occured immediately return to the caller. */ |
2568 | if (ret == BGP_ATTR_PARSE_ERROR) | |
6e4ab12f | 2569 | { |
16286195 DS |
2570 | zlog_warn ("%s: Attribute %s, parse error", |
2571 | peer->host, | |
56b40679 | 2572 | lookup_msg(attr_str, type, NULL)); |
b881c707 PJ |
2573 | if (as4_path) |
2574 | aspath_unintern (&as4_path); | |
2575 | return ret; | |
6e4ab12f | 2576 | } |
b881c707 PJ |
2577 | if (ret == BGP_ATTR_PARSE_WITHDRAW) |
2578 | { | |
2579 | ||
16286195 DS |
2580 | zlog_warn ("%s: Attribute %s, parse error - treating as withdrawal", |
2581 | peer->host, | |
56b40679 | 2582 | lookup_msg(attr_str, type, NULL)); |
b881c707 PJ |
2583 | if (as4_path) |
2584 | aspath_unintern (&as4_path); | |
2585 | return ret; | |
2586 | } | |
2587 | ||
718e3744 | 2588 | /* Check the fetched length. */ |
2589 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
2590 | { | |
16286195 | 2591 | zlog_warn ("%s: BGP attribute %s, fetch error", |
56b40679 | 2592 | peer->host, lookup_msg(attr_str, type, NULL)); |
718e3744 | 2593 | bgp_notify_send (peer, |
2594 | BGP_NOTIFY_UPDATE_ERR, | |
2595 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2596 | if (as4_path) |
2597 | aspath_unintern (&as4_path); | |
2598 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2599 | } |
2600 | } | |
2601 | ||
2602 | /* Check final read pointer is same as end pointer. */ | |
2603 | if (BGP_INPUT_PNT (peer) != endp) | |
2604 | { | |
16286195 | 2605 | zlog_warn ("%s: BGP attribute %s, length mismatch", |
56b40679 | 2606 | peer->host, lookup_msg(attr_str, type, NULL)); |
718e3744 | 2607 | bgp_notify_send (peer, |
2608 | BGP_NOTIFY_UPDATE_ERR, | |
2609 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2610 | if (as4_path) |
2611 | aspath_unintern (&as4_path); | |
2612 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2613 | } |
2614 | ||
bb7bef14 PJ |
2615 | /* Check all mandatory well-known attributes are present */ |
2616 | { | |
2617 | bgp_attr_parse_ret_t ret; | |
52a51fd3 | 2618 | if ((ret = bgp_attr_check (peer, attr)) < 0) |
bb7bef14 PJ |
2619 | { |
2620 | if (as4_path) | |
2621 | aspath_unintern (&as4_path); | |
2622 | return ret; | |
2623 | } | |
2624 | } | |
2625 | ||
0b2aa3a0 PJ |
2626 | /* |
2627 | * At this place we can see whether we got AS4_PATH and/or | |
2628 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2629 | * We can not do this before we've read all attributes because | |
2630 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2631 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2632 | * in relationship to AGGREGATOR. | |
2633 | * So, to be defensive, we are not relying on any order and read | |
2634 | * all attributes first, including these 32bit ones, and now, | |
2635 | * afterwards, we look what and if something is to be done for as4. | |
67495ddb PJ |
2636 | * |
2637 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2638 | * MP_UNREACH_NLRI. | |
0b2aa3a0 | 2639 | */ |
f57000c0 DL |
2640 | /* actually... this doesn't ever return failure currently, but |
2641 | * better safe than sorry */ | |
67495ddb PJ |
2642 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)) |
2643 | && bgp_attr_munge_as4_attrs (peer, attr, as4_path, | |
0b2aa3a0 | 2644 | as4_aggregator, &as4_aggregator_addr)) |
b881c707 | 2645 | { |
f57000c0 DL |
2646 | bgp_notify_send (peer, |
2647 | BGP_NOTIFY_UPDATE_ERR, | |
2648 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 PJ |
2649 | if (as4_path) |
2650 | aspath_unintern (&as4_path); | |
2651 | return BGP_ATTR_PARSE_ERROR; | |
2652 | } | |
0b2aa3a0 PJ |
2653 | |
2654 | /* At this stage, we have done all fiddling with as4, and the | |
2655 | * resulting info is in attr->aggregator resp. attr->aspath | |
2656 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2657 | * order to save memory | |
2658 | */ | |
b881c707 | 2659 | if (as4_path) |
0b2aa3a0 | 2660 | { |
f6f434b2 | 2661 | aspath_unintern (&as4_path); /* unintern - it is in the hash */ |
0b2aa3a0 PJ |
2662 | /* The flag that we got this is still there, but that does not |
2663 | * do any trouble | |
2664 | */ | |
2665 | } | |
2666 | /* | |
2667 | * The "rest" of the code does nothing with as4_aggregator. | |
2668 | * there is no memory attached specifically which is not part | |
2669 | * of the attr. | |
2670 | * so ignoring just means do nothing. | |
2671 | */ | |
2672 | /* | |
2673 | * Finally do the checks on the aspath we did not do yet | |
2674 | * because we waited for a potentially synthesized aspath. | |
2675 | */ | |
b881c707 | 2676 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) |
0b2aa3a0 | 2677 | { |
835315bf | 2678 | ret = bgp_attr_aspath_check (peer, attr); |
b881c707 | 2679 | if (ret != BGP_ATTR_PARSE_PROCEED) |
0b2aa3a0 PJ |
2680 | return ret; |
2681 | } | |
aadc0905 DS |
2682 | /* Finally intern unknown attribute. */ |
2683 | if (attr->transit) | |
2684 | attr->transit = transit_intern (attr->transit); | |
2685 | if (attr->encap_subtlvs) | |
2686 | attr->encap_subtlvs = encap_intern (attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 2687 | #if ENABLE_BGP_VNC |
aadc0905 DS |
2688 | if (attr->vnc_subtlvs) |
2689 | attr->vnc_subtlvs = encap_intern (attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 2690 | #endif |
718e3744 | 2691 | |
b881c707 | 2692 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2693 | } |
2694 | ||
8c71e481 | 2695 | size_t |
2b26882d DW |
2696 | bgp_packet_mpattr_start (struct stream *s, struct peer *peer, |
2697 | afi_t afi, safi_t safi, | |
3f9c7369 | 2698 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 PM |
2699 | struct attr *attr) |
2700 | { | |
2701 | size_t sizep; | |
b58ed1f8 | 2702 | iana_afi_t pkt_afi; |
9cabb64b | 2703 | safi_t pkt_safi; |
2b26882d | 2704 | afi_t nh_afi; |
8c71e481 PM |
2705 | |
2706 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2707 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2708 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
2709 | sizep = stream_get_endp (s); | |
2710 | stream_putw (s, 0); /* Marker: Attribute length. */ | |
93b73dfa | 2711 | |
9cabb64b | 2712 | |
2713 | /* Convert AFI, SAFI to values for packet. */ | |
2714 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
2715 | ||
2716 | stream_putw (s, pkt_afi); /* AFI */ | |
2717 | stream_putc (s, pkt_safi); /* SAFI */ | |
aab1814c | 2718 | |
a080e8fb | 2719 | /* Nexthop AFI */ |
3684a40b | 2720 | if (afi == AFI_IP && safi == SAFI_UNICAST) |
2721 | { | |
2722 | nh_afi = peer_cap_enhe (peer, afi, safi) ? AFI_IP6 : AFI_IP; | |
2723 | } | |
2724 | else if (safi == SAFI_LABELED_UNICAST) | |
2725 | nh_afi = afi; | |
2726 | else | |
aadc0905 | 2727 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
aab1814c | 2728 | |
8c71e481 | 2729 | /* Nexthop */ |
3800c7b0 | 2730 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8a92a8a0 | 2731 | switch (nh_afi) |
8c71e481 PM |
2732 | { |
2733 | case AFI_IP: | |
2734 | switch (safi) | |
2735 | { | |
6407da5a | 2736 | case SAFI_UNICAST: |
8c71e481 | 2737 | case SAFI_MULTICAST: |
cd1964ff | 2738 | case SAFI_LABELED_UNICAST: |
8c71e481 PM |
2739 | stream_putc (s, 4); |
2740 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2741 | break; | |
2742 | case SAFI_MPLS_VPN: | |
2743 | stream_putc (s, 12); | |
93b73dfa | 2744 | stream_putl (s, 0); /* RD = 0, per RFC */ |
8c71e481 | 2745 | stream_putl (s, 0); |
aadc0905 | 2746 | stream_put (s, &attr->mp_nexthop_global_in, 4); |
8c71e481 | 2747 | break; |
587ff0fd | 2748 | case SAFI_ENCAP: |
3684a40b | 2749 | case SAFI_EVPN: |
587ff0fd | 2750 | stream_putc (s, 4); |
aadc0905 | 2751 | stream_put (s, &attr->mp_nexthop_global_in, 4); |
587ff0fd | 2752 | break; |
8c71e481 PM |
2753 | default: |
2754 | break; | |
2755 | } | |
2756 | break; | |
8c71e481 PM |
2757 | case AFI_IP6: |
2758 | switch (safi) | |
2759 | { | |
2760 | case SAFI_UNICAST: | |
2761 | case SAFI_MULTICAST: | |
cd1964ff | 2762 | case SAFI_LABELED_UNICAST: |
3684a40b | 2763 | case SAFI_EVPN: |
8c71e481 | 2764 | { |
aadc0905 | 2765 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { |
343e90c3 | 2766 | stream_putc (s, BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); |
aadc0905 DS |
2767 | stream_put (s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2768 | stream_put (s, &attr->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
343e90c3 DW |
2769 | } else { |
2770 | stream_putc (s, IPV6_MAX_BYTELEN); | |
aadc0905 | 2771 | stream_put (s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); |
343e90c3 | 2772 | } |
8c71e481 | 2773 | } |
93b73dfa LB |
2774 | break; |
2775 | case SAFI_MPLS_VPN: | |
2776 | { | |
aadc0905 | 2777 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL) { |
93b73dfa LB |
2778 | stream_putc (s, 24); |
2779 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2780 | stream_putl (s, 0); | |
aadc0905 DS |
2781 | stream_put (s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2782 | } else if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
93b73dfa LB |
2783 | stream_putc (s, 48); |
2784 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2785 | stream_putl (s, 0); | |
aadc0905 | 2786 | stream_put (s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); |
93b73dfa LB |
2787 | stream_putl (s, 0); /* RD = 0, per RFC */ |
2788 | stream_putl (s, 0); | |
aadc0905 | 2789 | stream_put (s, &attr->mp_nexthop_local, IPV6_MAX_BYTELEN); |
93b73dfa LB |
2790 | } |
2791 | } | |
2792 | break; | |
587ff0fd | 2793 | case SAFI_ENCAP: |
587ff0fd | 2794 | stream_putc (s, IPV6_MAX_BYTELEN); |
aadc0905 | 2795 | stream_put (s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); |
587ff0fd | 2796 | break; |
8c71e481 PM |
2797 | default: |
2798 | break; | |
2799 | } | |
2800 | break; | |
8c71e481 | 2801 | default: |
3684a40b | 2802 | zlog_err ("Bad nexthop when sening to %s, AFI %u SAFI %u nhlen %d", |
aadc0905 | 2803 | peer->host, afi, safi, attr->mp_nexthop_len); |
8c71e481 PM |
2804 | break; |
2805 | } | |
2806 | ||
2807 | /* SNPA */ | |
2808 | stream_putc (s, 0); | |
2809 | return sizep; | |
2810 | } | |
2811 | ||
2812 | void | |
2813 | bgp_packet_mpattr_prefix (struct stream *s, afi_t afi, safi_t safi, | |
2814 | struct prefix *p, struct prefix_rd *prd, | |
9bedbb1e | 2815 | mpls_label_t *label, int addpath_encode, |
b18825eb | 2816 | u_int32_t addpath_tx_id, struct attr *attr) |
8c71e481 | 2817 | { |
93b73dfa | 2818 | if (safi == SAFI_MPLS_VPN) |
8c71e481 | 2819 | { |
adbac85e DW |
2820 | if (addpath_encode) |
2821 | stream_putl(s, addpath_tx_id); | |
9bedbb1e | 2822 | /* Label, RD, Prefix write. */ |
8c71e481 | 2823 | stream_putc (s, p->prefixlen + 88); |
9bedbb1e | 2824 | stream_put (s, label, BGP_LABEL_BYTES); |
8c71e481 PM |
2825 | stream_put (s, prd->val, 8); |
2826 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
8c71e481 | 2827 | } |
128ea8ab | 2828 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) |
b18825eb | 2829 | { |
128ea8ab | 2830 | /* EVPN prefix - contents depend on type */ |
2831 | bgp_evpn_encode_prefix (s, p, prd, label, attr, | |
2832 | addpath_encode, addpath_tx_id); | |
b18825eb | 2833 | } |
cd1964ff DS |
2834 | else if (safi == SAFI_LABELED_UNICAST) |
2835 | { | |
2836 | /* Prefix write with label. */ | |
9bedbb1e | 2837 | stream_put_labeled_prefix(s, p, label); |
cd1964ff | 2838 | } |
93b73dfa LB |
2839 | else |
2840 | stream_put_prefix_addpath (s, p, addpath_encode, addpath_tx_id); | |
2841 | } | |
2842 | ||
2843 | size_t | |
2844 | bgp_packet_mpattr_prefix_size (afi_t afi, safi_t safi, struct prefix *p) | |
2845 | { | |
2846 | int size = PSIZE (p->prefixlen); | |
2847 | if (safi == SAFI_MPLS_VPN) | |
2848 | size += 88; | |
128ea8ab | 2849 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) |
2850 | size += 232; // TODO: Maximum possible for type-2, type-3 and type-5 | |
93b73dfa | 2851 | return size; |
8c71e481 PM |
2852 | } |
2853 | ||
f4c89855 | 2854 | /* |
65efcfce LB |
2855 | * Encodes the tunnel encapsulation attribute, |
2856 | * and with ENABLE_BGP_VNC the VNC attribute which uses | |
2857 | * almost the same TLV format | |
f4c89855 LB |
2858 | */ |
2859 | static void | |
2860 | bgp_packet_mpattr_tea( | |
2861 | struct bgp *bgp, | |
2862 | struct peer *peer, | |
2863 | struct stream *s, | |
2864 | struct attr *attr, | |
2865 | uint8_t attrtype) | |
2866 | { | |
2867 | unsigned int attrlenfield = 0; | |
587ff0fd | 2868 | unsigned int attrhdrlen = 0; |
f4c89855 LB |
2869 | struct bgp_attr_encap_subtlv *subtlvs; |
2870 | struct bgp_attr_encap_subtlv *st; | |
2871 | const char *attrname; | |
2872 | ||
aadc0905 | 2873 | if (!attr || |
ac73d8fb | 2874 | (attrtype == BGP_ATTR_ENCAP && |
aadc0905 DS |
2875 | (!attr->encap_tunneltype || |
2876 | attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
f4c89855 LB |
2877 | return; |
2878 | ||
2879 | switch (attrtype) { | |
2880 | case BGP_ATTR_ENCAP: | |
2881 | attrname = "Tunnel Encap"; | |
aadc0905 | 2882 | subtlvs = attr->encap_subtlvs; |
f4c6f62d LB |
2883 | if (subtlvs == NULL) /* nothing to do */ |
2884 | return; | |
f4c89855 LB |
2885 | /* |
2886 | * The tunnel encap attr has an "outer" tlv. | |
2887 | * T = tunneltype, | |
2888 | * L = total length of subtlvs, | |
2889 | * V = concatenated subtlvs. | |
2890 | */ | |
2891 | attrlenfield = 2 + 2; /* T + L */ | |
587ff0fd | 2892 | attrhdrlen = 1 + 1; /* subTLV T + L */ |
f4c89855 LB |
2893 | break; |
2894 | ||
65efcfce LB |
2895 | #if ENABLE_BGP_VNC |
2896 | case BGP_ATTR_VNC: | |
2897 | attrname = "VNC"; | |
aadc0905 | 2898 | subtlvs = attr->vnc_subtlvs; |
f4c6f62d LB |
2899 | if (subtlvs == NULL) /* nothing to do */ |
2900 | return; | |
65efcfce LB |
2901 | attrlenfield = 0; /* no outer T + L */ |
2902 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2903 | break; | |
2904 | #endif | |
2905 | ||
f4c89855 LB |
2906 | default: |
2907 | assert(0); | |
2908 | } | |
2909 | ||
f4c89855 LB |
2910 | /* compute attr length */ |
2911 | for (st = subtlvs; st; st = st->next) { | |
587ff0fd | 2912 | attrlenfield += (attrhdrlen + st->length); |
f4c89855 LB |
2913 | } |
2914 | ||
f4c89855 LB |
2915 | if (attrlenfield > 0xffff) { |
2916 | zlog_info ("%s attribute is too long (length=%d), can't send it", | |
2917 | attrname, | |
2918 | attrlenfield); | |
2919 | return; | |
2920 | } | |
2921 | ||
2922 | if (attrlenfield > 0xff) { | |
2923 | /* 2-octet length field */ | |
2924 | stream_putc (s, | |
2925 | BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2926 | stream_putc (s, attrtype); | |
2927 | stream_putw (s, attrlenfield & 0xffff); | |
2928 | } else { | |
2929 | /* 1-octet length field */ | |
2930 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL); | |
2931 | stream_putc (s, attrtype); | |
2932 | stream_putc (s, attrlenfield & 0xff); | |
2933 | } | |
2934 | ||
2935 | if (attrtype == BGP_ATTR_ENCAP) { | |
2936 | /* write outer T+L */ | |
aadc0905 | 2937 | stream_putw(s, attr->encap_tunneltype); |
f4c89855 LB |
2938 | stream_putw(s, attrlenfield - 4); |
2939 | } | |
2940 | ||
2941 | /* write each sub-tlv */ | |
2942 | for (st = subtlvs; st; st = st->next) { | |
587ff0fd LB |
2943 | if (attrtype == BGP_ATTR_ENCAP) { |
2944 | stream_putc (s, st->type); | |
2945 | stream_putc (s, st->length); | |
65efcfce LB |
2946 | #if ENABLE_BGP_VNC |
2947 | } else { | |
2948 | stream_putw (s, st->type); | |
2949 | stream_putw (s, st->length); | |
2950 | #endif | |
587ff0fd | 2951 | } |
f4c89855 LB |
2952 | stream_put (s, st->value, st->length); |
2953 | } | |
2954 | } | |
f4c89855 | 2955 | |
8c71e481 PM |
2956 | void |
2957 | bgp_packet_mpattr_end (struct stream *s, size_t sizep) | |
2958 | { | |
2959 | /* Set MP attribute length. Don't count the (2) bytes used to encode | |
2960 | the attr length */ | |
2961 | stream_putw_at (s, sizep, (stream_get_endp (s) - sizep) - 2); | |
2962 | } | |
2963 | ||
718e3744 | 2964 | /* Make attribute packet. */ |
2965 | bgp_size_t | |
2966 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
8c71e481 | 2967 | struct stream *s, struct attr *attr, |
3f9c7369 | 2968 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 | 2969 | struct prefix *p, afi_t afi, safi_t safi, |
9bedbb1e | 2970 | struct peer *from, struct prefix_rd *prd, mpls_label_t *label, |
adbac85e DW |
2971 | int addpath_encode, |
2972 | u_int32_t addpath_tx_id) | |
718e3744 | 2973 | { |
fe69a505 | 2974 | size_t cp; |
0b2aa3a0 | 2975 | size_t aspath_sizep; |
718e3744 | 2976 | struct aspath *aspath; |
0b2aa3a0 PJ |
2977 | int send_as4_path = 0; |
2978 | int send_as4_aggregator = 0; | |
2979 | int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
718e3744 | 2980 | |
2981 | if (! bgp) | |
75aead62 | 2982 | bgp = peer->bgp; |
718e3744 | 2983 | |
2984 | /* Remember current pointer. */ | |
9985f83c | 2985 | cp = stream_get_endp (s); |
718e3744 | 2986 | |
8a92a8a0 | 2987 | if (p && !((afi == AFI_IP && safi == SAFI_UNICAST) && |
343e90c3 | 2988 | !peer_cap_enhe(peer, afi, safi))) |
8c71e481 | 2989 | { |
93b73dfa LB |
2990 | size_t mpattrlen_pos = 0; |
2991 | ||
2b26882d | 2992 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, vecarr, attr); |
9bedbb1e | 2993 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
b18825eb | 2994 | addpath_encode, addpath_tx_id, attr); |
8c71e481 PM |
2995 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
2996 | } | |
2997 | ||
718e3744 | 2998 | /* Origin attribute. */ |
2999 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3000 | stream_putc (s, BGP_ATTR_ORIGIN); | |
3001 | stream_putc (s, 1); | |
3002 | stream_putc (s, attr->origin); | |
3003 | ||
3004 | /* AS path attribute. */ | |
3005 | ||
3006 | /* If remote-peer is EBGP */ | |
6d85b15b | 3007 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 3008 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) |
fe69a505 | 3009 | || attr->aspath->segments == NULL) |
fee0f4c6 | 3010 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 3011 | { |
3012 | aspath = aspath_dup (attr->aspath); | |
3013 | ||
66b199b2 DS |
3014 | /* Even though we may not be configured for confederations we may have |
3015 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3016 | aspath = aspath_delete_confed_seq (aspath); | |
3017 | ||
718e3744 | 3018 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) |
3019 | { | |
66b199b2 | 3020 | /* Stuff our path CONFED_ID on the front */ |
718e3744 | 3021 | aspath = aspath_add_seq (aspath, bgp->confed_id); |
3022 | } | |
3023 | else | |
3024 | { | |
9d3f9705 AC |
3025 | if (peer->change_local_as) { |
3026 | /* If replace-as is specified, we only use the change_local_as when | |
3027 | advertising routes. */ | |
3028 | if( ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) { | |
3029 | aspath = aspath_add_seq (aspath, peer->local_as); | |
3030 | } | |
718e3744 | 3031 | aspath = aspath_add_seq (aspath, peer->change_local_as); |
9d3f9705 AC |
3032 | } else { |
3033 | aspath = aspath_add_seq (aspath, peer->local_as); | |
3034 | } | |
718e3744 | 3035 | } |
3036 | } | |
6d85b15b | 3037 | else if (peer->sort == BGP_PEER_CONFED) |
718e3744 | 3038 | { |
3039 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
3040 | aspath = aspath_dup (attr->aspath); | |
3041 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
3042 | } | |
3043 | else | |
3044 | aspath = attr->aspath; | |
3045 | ||
0b2aa3a0 PJ |
3046 | /* If peer is not AS4 capable, then: |
3047 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3048 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment | |
3049 | * types are in it (i.e. exclude them if they are there) | |
3050 | * AND do this only if there is at least one asnum > 65535 in the path! | |
3051 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change | |
3052 | * all ASnums > 65535 to BGP_AS_TRANS | |
3053 | */ | |
3054 | ||
3055 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3056 | stream_putc (s, BGP_ATTR_AS_PATH); | |
3057 | aspath_sizep = stream_get_endp (s); | |
3058 | stream_putw (s, 0); | |
3059 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit)); | |
3060 | ||
3061 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3062 | * in the path | |
3063 | */ | |
3064 | if (!use32bit && aspath_has_as4 (aspath)) | |
3065 | send_as4_path = 1; /* we'll do this later, at the correct place */ | |
3066 | ||
718e3744 | 3067 | /* Nexthop attribute. */ |
343e90c3 | 3068 | if (afi == AFI_IP && safi == SAFI_UNICAST && !peer_cap_enhe(peer, afi, safi)) |
718e3744 | 3069 | { |
8a92a8a0 DS |
3070 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
3071 | { | |
3072 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3073 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3074 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3075 | stream_putc (s, 4); | |
3076 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
3077 | } | |
343e90c3 | 3078 | else if (peer_cap_enhe(from, afi, safi)) |
8a92a8a0 DS |
3079 | { |
3080 | /* | |
3081 | * Likely this is the case when an IPv4 prefix was received with | |
3082 | * Extended Next-hop capability and now being advertised to | |
3083 | * non-ENHE peers. | |
3084 | * Setting the mandatory (ipv4) next-hop attribute here to enable | |
3085 | * implicit next-hop self with correct (ipv4 address family). | |
3086 | */ | |
3087 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3088 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3089 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, NULL); | |
3090 | stream_putc (s, 4); | |
3091 | stream_put_ipv4 (s, 0); | |
3092 | } | |
718e3744 | 3093 | } |
3094 | ||
3095 | /* MED attribute. */ | |
abc920f8 DS |
3096 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC) || |
3097 | bgp->maxmed_active) | |
718e3744 | 3098 | { |
3099 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3100 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
3101 | stream_putc (s, 4); | |
abc920f8 | 3102 | stream_putl (s, (bgp->maxmed_active ? bgp->maxmed_value : attr->med)); |
718e3744 | 3103 | } |
3104 | ||
3105 | /* Local preference. */ | |
6d85b15b JBD |
3106 | if (peer->sort == BGP_PEER_IBGP || |
3107 | peer->sort == BGP_PEER_CONFED) | |
718e3744 | 3108 | { |
3109 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3110 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
3111 | stream_putc (s, 4); | |
3112 | stream_putl (s, attr->local_pref); | |
3113 | } | |
3114 | ||
3115 | /* Atomic aggregate. */ | |
3116 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
3117 | { | |
3118 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3119 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3120 | stream_putc (s, 0); | |
3121 | } | |
3122 | ||
3123 | /* Aggregator. */ | |
3124 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
3125 | { | |
0b2aa3a0 | 3126 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ |
718e3744 | 3127 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
3128 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
3129 | |
3130 | if (use32bit) | |
3131 | { | |
3132 | /* AS4 capable peer */ | |
3133 | stream_putc (s, 8); | |
aadc0905 | 3134 | stream_putl (s, attr->aggregator_as); |
0b2aa3a0 PJ |
3135 | } |
3136 | else | |
3137 | { | |
3138 | /* 2-byte AS peer */ | |
3139 | stream_putc (s, 6); | |
3140 | ||
3141 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */ | |
aadc0905 | 3142 | if ( attr->aggregator_as > 65535 ) |
0b2aa3a0 PJ |
3143 | { |
3144 | stream_putw (s, BGP_AS_TRANS); | |
3145 | ||
3146 | /* we have to send AS4_AGGREGATOR, too. | |
3147 | * we'll do that later in order to send attributes in ascending | |
3148 | * order. | |
3149 | */ | |
3150 | send_as4_aggregator = 1; | |
3151 | } | |
3152 | else | |
aadc0905 | 3153 | stream_putw (s, (u_int16_t) attr->aggregator_as); |
0b2aa3a0 | 3154 | } |
aadc0905 | 3155 | stream_put_ipv4 (s, attr->aggregator_addr.s_addr); |
718e3744 | 3156 | } |
3157 | ||
3158 | /* Community attribute. */ | |
3159 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3160 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
3161 | { | |
3162 | if (attr->community->size * 4 > 255) | |
3163 | { | |
3164 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3165 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3166 | stream_putw (s, attr->community->size * 4); | |
3167 | } | |
3168 | else | |
3169 | { | |
3170 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3171 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3172 | stream_putc (s, attr->community->size * 4); | |
3173 | } | |
3174 | stream_put (s, attr->community->val, attr->community->size * 4); | |
3175 | } | |
3176 | ||
57d187bc JS |
3177 | /* |
3178 | * Large Community attribute. | |
3179 | */ | |
aadc0905 | 3180 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_LARGE_COMMUNITY) |
57d187bc JS |
3181 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES))) |
3182 | { | |
aadc0905 | 3183 | if (attr->lcommunity->size * 12 > 255) |
2acb4ac2 DL |
3184 | { |
3185 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3186 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
aadc0905 | 3187 | stream_putw (s, attr->lcommunity->size * 12); |
2acb4ac2 | 3188 | } |
57d187bc | 3189 | else |
2acb4ac2 DL |
3190 | { |
3191 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3192 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
aadc0905 | 3193 | stream_putc (s, attr->lcommunity->size * 12); |
2acb4ac2 | 3194 | } |
aadc0905 | 3195 | stream_put (s, attr->lcommunity->val, attr->lcommunity->size * 12); |
57d187bc JS |
3196 | } |
3197 | ||
718e3744 | 3198 | /* Route Reflector. */ |
6d85b15b | 3199 | if (peer->sort == BGP_PEER_IBGP |
718e3744 | 3200 | && from |
6d85b15b | 3201 | && from->sort == BGP_PEER_IBGP) |
718e3744 | 3202 | { |
3203 | /* Originator ID. */ | |
3204 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3205 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
3206 | stream_putc (s, 4); | |
3207 | ||
3208 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
aadc0905 | 3209 | stream_put_in_addr (s, &attr->originator_id); |
34c3f81b PJ |
3210 | else |
3211 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 3212 | |
3213 | /* Cluster list. */ | |
3214 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3215 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
3216 | ||
aadc0905 | 3217 | if (attr->cluster) |
718e3744 | 3218 | { |
aadc0905 | 3219 | stream_putc (s, attr->cluster->length + 4); |
718e3744 | 3220 | /* If this peer configuration's parent BGP has cluster_id. */ |
3221 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3222 | stream_put_in_addr (s, &bgp->cluster_id); | |
3223 | else | |
3224 | stream_put_in_addr (s, &bgp->router_id); | |
aadc0905 DS |
3225 | stream_put (s, attr->cluster->list, |
3226 | attr->cluster->length); | |
718e3744 | 3227 | } |
3228 | else | |
3229 | { | |
3230 | stream_putc (s, 4); | |
3231 | /* If this peer configuration's parent BGP has cluster_id. */ | |
3232 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3233 | stream_put_in_addr (s, &bgp->cluster_id); | |
3234 | else | |
3235 | stream_put_in_addr (s, &bgp->router_id); | |
3236 | } | |
3237 | } | |
3238 | ||
718e3744 | 3239 | /* Extended Communities attribute. */ |
3240 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3241 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
3242 | { | |
6d85b15b JBD |
3243 | if (peer->sort == BGP_PEER_IBGP |
3244 | || peer->sort == BGP_PEER_CONFED) | |
718e3744 | 3245 | { |
aadc0905 | 3246 | if (attr->ecommunity->size * 8 > 255) |
4372df71 | 3247 | { |
3248 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3249 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
aadc0905 | 3250 | stream_putw (s, attr->ecommunity->size * 8); |
4372df71 | 3251 | } |
3252 | else | |
3253 | { | |
3254 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3255 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
aadc0905 | 3256 | stream_putc (s, attr->ecommunity->size * 8); |
4372df71 | 3257 | } |
aadc0905 | 3258 | stream_put (s, attr->ecommunity->val, attr->ecommunity->size * 8); |
718e3744 | 3259 | } |
3260 | else | |
3261 | { | |
5228ad27 | 3262 | u_int8_t *pnt; |
4372df71 | 3263 | int tbit; |
3264 | int ecom_tr_size = 0; | |
3265 | int i; | |
3266 | ||
aadc0905 | 3267 | for (i = 0; i < attr->ecommunity->size; i++) |
4372df71 | 3268 | { |
aadc0905 | 3269 | pnt = attr->ecommunity->val + (i * 8); |
4372df71 | 3270 | tbit = *pnt; |
3271 | ||
3272 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3273 | continue; | |
3274 | ||
3275 | ecom_tr_size++; | |
3276 | } | |
3277 | ||
3278 | if (ecom_tr_size) | |
3279 | { | |
3280 | if (ecom_tr_size * 8 > 255) | |
3281 | { | |
3282 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3283 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
3284 | stream_putw (s, ecom_tr_size * 8); | |
3285 | } | |
3286 | else | |
3287 | { | |
3288 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3289 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
3290 | stream_putc (s, ecom_tr_size * 8); | |
3291 | } | |
3292 | ||
aadc0905 | 3293 | for (i = 0; i < attr->ecommunity->size; i++) |
4372df71 | 3294 | { |
aadc0905 | 3295 | pnt = attr->ecommunity->val + (i * 8); |
4372df71 | 3296 | tbit = *pnt; |
3297 | ||
3298 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3299 | continue; | |
3300 | ||
3301 | stream_put (s, pnt, 8); | |
3302 | } | |
3303 | } | |
718e3744 | 3304 | } |
718e3744 | 3305 | } |
0b2aa3a0 | 3306 | |
6cf48acc VV |
3307 | /* Label index attribute. */ |
3308 | if (safi == SAFI_LABELED_UNICAST) | |
3309 | { | |
c5a543b4 | 3310 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_PREFIX_SID)) |
6cf48acc VV |
3311 | { |
3312 | u_int32_t label_index; | |
3313 | ||
aadc0905 | 3314 | label_index = attr->label_index; |
c5a543b4 DW |
3315 | |
3316 | if (label_index != BGP_INVALID_LABEL_INDEX) | |
3317 | { | |
3318 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3319 | stream_putc (s, BGP_ATTR_PREFIX_SID); | |
3320 | stream_putc (s, 10); | |
3321 | stream_putc (s, BGP_PREFIX_SID_LABEL_INDEX); | |
3322 | stream_putw (s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3323 | stream_putc (s, 0); // reserved | |
3324 | stream_putw (s, 0); // flags | |
3325 | stream_putl (s, label_index); | |
3326 | } | |
6cf48acc VV |
3327 | } |
3328 | } | |
3329 | ||
0b2aa3a0 PJ |
3330 | if ( send_as4_path ) |
3331 | { | |
3332 | /* If the peer is NOT As4 capable, AND */ | |
3333 | /* there are ASnums > 65535 in path THEN | |
3334 | * give out AS4_PATH */ | |
3335 | ||
3336 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3337 | * path segments! | |
3338 | * Hm, I wonder... confederation things *should* only be at | |
3339 | * the beginning of an aspath, right? Then we should use | |
3340 | * aspath_delete_confed_seq for this, because it is already | |
3341 | * there! (JK) | |
3342 | * Folks, talk to me: what is reasonable here!? | |
3343 | */ | |
3344 | aspath = aspath_delete_confed_seq (aspath); | |
3345 | ||
3346 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
3347 | stream_putc (s, BGP_ATTR_AS4_PATH); | |
3348 | aspath_sizep = stream_get_endp (s); | |
3349 | stream_putw (s, 0); | |
3350 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1)); | |
3351 | } | |
3352 | ||
3353 | if (aspath != attr->aspath) | |
3354 | aspath_free (aspath); | |
3355 | ||
3356 | if ( send_as4_aggregator ) | |
3357 | { | |
0b2aa3a0 PJ |
3358 | /* send AS4_AGGREGATOR, at this place */ |
3359 | /* this section of code moved here in order to ensure the correct | |
3360 | * *ascending* order of attributes | |
3361 | */ | |
3362 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3363 | stream_putc (s, BGP_ATTR_AS4_AGGREGATOR); | |
3364 | stream_putc (s, 8); | |
aadc0905 DS |
3365 | stream_putl (s, attr->aggregator_as); |
3366 | stream_put_ipv4 (s, attr->aggregator_addr.s_addr); | |
0b2aa3a0 | 3367 | } |
587ff0fd | 3368 | |
aee875b5 PG |
3369 | if (((afi == AFI_IP || afi == AFI_IP6) && |
3370 | (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) || | |
3371 | (afi == AFI_L2VPN && safi == SAFI_EVPN)) | |
587ff0fd LB |
3372 | { |
3373 | /* Tunnel Encap attribute */ | |
3374 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3375 | |
3376 | #if ENABLE_BGP_VNC | |
3377 | /* VNC attribute */ | |
3378 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
3379 | #endif | |
587ff0fd LB |
3380 | } |
3381 | ||
718e3744 | 3382 | /* Unknown transit attribute. */ |
aadc0905 DS |
3383 | if (attr->transit) |
3384 | stream_put (s, attr->transit->val, attr->transit->length); | |
718e3744 | 3385 | |
3386 | /* Return total size of attribute. */ | |
9985f83c | 3387 | return stream_get_endp (s) - cp; |
718e3744 | 3388 | } |
3389 | ||
8c71e481 PM |
3390 | size_t |
3391 | bgp_packet_mpunreach_start (struct stream *s, afi_t afi, safi_t safi) | |
718e3744 | 3392 | { |
718e3744 | 3393 | unsigned long attrlen_pnt; |
b58ed1f8 | 3394 | iana_afi_t pkt_afi; |
9cabb64b | 3395 | safi_t pkt_safi; |
718e3744 | 3396 | |
8c71e481 PM |
3397 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3398 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
718e3744 | 3399 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); |
3400 | ||
9985f83c | 3401 | attrlen_pnt = stream_get_endp (s); |
8c71e481 | 3402 | stream_putw (s, 0); /* Length of this attribute. */ |
718e3744 | 3403 | |
9cabb64b | 3404 | /* Convert AFI, SAFI to values for packet. */ |
3405 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
3406 | ||
3407 | stream_putw (s, pkt_afi); | |
3408 | stream_putc (s, pkt_safi); | |
3409 | ||
8c71e481 PM |
3410 | return attrlen_pnt; |
3411 | } | |
718e3744 | 3412 | |
8c71e481 PM |
3413 | void |
3414 | bgp_packet_mpunreach_prefix (struct stream *s, struct prefix *p, | |
3415 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
9bedbb1e | 3416 | mpls_label_t *label, int addpath_encode, |
b18825eb | 3417 | u_int32_t addpath_tx_id, struct attr *attr) |
8c71e481 | 3418 | { |
cd1964ff DS |
3419 | u_char wlabel[3] = {0x80, 0x00, 0x00}; |
3420 | ||
3421 | if (safi == SAFI_LABELED_UNICAST) | |
9bedbb1e | 3422 | label = (mpls_label_t *) wlabel; |
cd1964ff | 3423 | |
b18825eb | 3424 | return bgp_packet_mpattr_prefix (s, afi, safi, p, prd, |
9bedbb1e DW |
3425 | label, |
3426 | addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 3427 | } |
718e3744 | 3428 | |
8c71e481 PM |
3429 | void |
3430 | bgp_packet_mpunreach_end (struct stream *s, size_t attrlen_pnt) | |
3431 | { | |
93b73dfa | 3432 | bgp_packet_mpattr_end (s, attrlen_pnt); |
718e3744 | 3433 | } |
3434 | ||
3435 | /* Initialization of attribute. */ | |
3436 | void | |
fe69a505 | 3437 | bgp_attr_init (void) |
718e3744 | 3438 | { |
718e3744 | 3439 | aspath_init (); |
3440 | attrhash_init (); | |
3441 | community_init (); | |
3442 | ecommunity_init (); | |
57d187bc | 3443 | lcommunity_init (); |
718e3744 | 3444 | cluster_init (); |
3445 | transit_init (); | |
bede7744 | 3446 | encap_init (); |
718e3744 | 3447 | } |
3448 | ||
228da428 CC |
3449 | void |
3450 | bgp_attr_finish (void) | |
3451 | { | |
3452 | aspath_finish (); | |
3453 | attrhash_finish (); | |
3454 | community_finish (); | |
3455 | ecommunity_finish (); | |
57d187bc | 3456 | lcommunity_finish (); |
228da428 CC |
3457 | cluster_finish (); |
3458 | transit_finish (); | |
bede7744 | 3459 | encap_finish (); |
228da428 CC |
3460 | } |
3461 | ||
718e3744 | 3462 | /* Make attribute packet. */ |
3463 | void | |
a384592f | 3464 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
3465 | struct prefix *prefix) | |
718e3744 | 3466 | { |
3467 | unsigned long cp; | |
3468 | unsigned long len; | |
0b2aa3a0 | 3469 | size_t aspath_lenp; |
718e3744 | 3470 | struct aspath *aspath; |
adbac85e DW |
3471 | int addpath_encode = 0; |
3472 | u_int32_t addpath_tx_id = 0; | |
718e3744 | 3473 | |
3474 | /* Remember current pointer. */ | |
9985f83c | 3475 | cp = stream_get_endp (s); |
718e3744 | 3476 | |
3477 | /* Place holder of length. */ | |
3478 | stream_putw (s, 0); | |
3479 | ||
3480 | /* Origin attribute. */ | |
3481 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3482 | stream_putc (s, BGP_ATTR_ORIGIN); | |
3483 | stream_putc (s, 1); | |
3484 | stream_putc (s, attr->origin); | |
3485 | ||
3486 | aspath = attr->aspath; | |
0b2aa3a0 PJ |
3487 | |
3488 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3489 | stream_putc (s, BGP_ATTR_AS_PATH); | |
3490 | aspath_lenp = stream_get_endp (s); | |
3491 | stream_putw (s, 0); | |
3492 | ||
3493 | stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1)); | |
718e3744 | 3494 | |
3495 | /* Nexthop attribute. */ | |
a384592f | 3496 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
56c1f7d8 | 3497 | if(prefix != NULL && prefix->family != AF_INET6) |
a384592f | 3498 | { |
3499 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3500 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3501 | stream_putc (s, 4); | |
3502 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
3503 | } | |
718e3744 | 3504 | |
3505 | /* MED attribute. */ | |
3506 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
3507 | { | |
3508 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3509 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
3510 | stream_putc (s, 4); | |
3511 | stream_putl (s, attr->med); | |
3512 | } | |
3513 | ||
3514 | /* Local preference. */ | |
3515 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
3516 | { | |
3517 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3518 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
3519 | stream_putc (s, 4); | |
3520 | stream_putl (s, attr->local_pref); | |
3521 | } | |
3522 | ||
3523 | /* Atomic aggregate. */ | |
3524 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
3525 | { | |
3526 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3527 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3528 | stream_putc (s, 0); | |
3529 | } | |
3530 | ||
3531 | /* Aggregator. */ | |
3532 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
3533 | { | |
3534 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3535 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 | 3536 | stream_putc (s, 8); |
aadc0905 DS |
3537 | stream_putl (s, attr->aggregator_as); |
3538 | stream_put_ipv4 (s, attr->aggregator_addr.s_addr); | |
718e3744 | 3539 | } |
3540 | ||
3541 | /* Community attribute. */ | |
3542 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
3543 | { | |
3544 | if (attr->community->size * 4 > 255) | |
3545 | { | |
3546 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3547 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3548 | stream_putw (s, attr->community->size * 4); | |
3549 | } | |
3550 | else | |
3551 | { | |
3552 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3553 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3554 | stream_putc (s, attr->community->size * 4); | |
3555 | } | |
3556 | stream_put (s, attr->community->val, attr->community->size * 4); | |
3557 | } | |
3558 | ||
57d187bc | 3559 | /* Large Community attribute. */ |
aadc0905 | 3560 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES)) |
57d187bc | 3561 | { |
aadc0905 | 3562 | if (attr->lcommunity->size * 12 > 255) |
2acb4ac2 DL |
3563 | { |
3564 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3565 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
aadc0905 | 3566 | stream_putw (s, attr->lcommunity->size * 12); |
2acb4ac2 | 3567 | } |
57d187bc | 3568 | else |
2acb4ac2 DL |
3569 | { |
3570 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3571 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
aadc0905 | 3572 | stream_putc (s, attr->lcommunity->size * 12); |
2acb4ac2 | 3573 | } |
57d187bc | 3574 | |
aadc0905 | 3575 | stream_put (s, attr->lcommunity->val, attr->lcommunity->size * 12); |
57d187bc JS |
3576 | } |
3577 | ||
a384592f | 3578 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ |
aadc0905 DS |
3579 | if (prefix != NULL && prefix->family == AF_INET6 && |
3580 | (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL || | |
3581 | attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) ) | |
a384592f | 3582 | { |
3583 | int sizep; | |
aadc0905 | 3584 | |
a384592f | 3585 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); |
3586 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 3587 | sizep = stream_get_endp (s); |
a384592f | 3588 | |
3589 | /* MP header */ | |
fb982c25 | 3590 | stream_putc (s, 0); /* Marker: Attribute length. */ |
a384592f | 3591 | stream_putw(s, AFI_IP6); /* AFI */ |
3592 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3593 | ||
3594 | /* Next hop */ | |
aadc0905 DS |
3595 | stream_putc(s, attr->mp_nexthop_len); |
3596 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3597 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3598 | stream_put(s, &attr->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
a384592f | 3599 | |
3600 | /* SNPA */ | |
3601 | stream_putc(s, 0); | |
3602 | ||
3603 | /* Prefix */ | |
adbac85e | 3604 | stream_put_prefix_addpath (s, prefix, addpath_encode, addpath_tx_id); |
a384592f | 3605 | |
3606 | /* Set MP attribute length. */ | |
9985f83c | 3607 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 3608 | } |
a384592f | 3609 | |
c5a543b4 DW |
3610 | /* Prefix SID */ |
3611 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_PREFIX_SID)) | |
6cf48acc | 3612 | { |
aadc0905 | 3613 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) |
c5a543b4 DW |
3614 | { |
3615 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3616 | stream_putc (s, BGP_ATTR_PREFIX_SID); | |
3617 | stream_putc (s, 10); | |
3618 | stream_putc (s, BGP_PREFIX_SID_LABEL_INDEX); | |
3619 | stream_putc (s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3620 | stream_putc (s, 0); // reserved | |
3621 | stream_putw (s, 0); // flags | |
aadc0905 | 3622 | stream_putl (s, attr->label_index); |
c5a543b4 | 3623 | } |
6cf48acc VV |
3624 | } |
3625 | ||
718e3744 | 3626 | /* Return total size of attribute. */ |
9985f83c | 3627 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 3628 | stream_putw_at (s, cp, len); |
3629 | } |