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Merge pull request #2944 from thbtcllt/master
[mirror_frr.git] / bgpd / bgp_attr.c
CommitLineData
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"
14454c9f 42#include "bgpd/bgp_errors.h"
9bedbb1e 43#include "bgpd/bgp_label.h"
718e3744 44#include "bgpd/bgp_packet.h"
45#include "bgpd/bgp_ecommunity.h"
57d187bc 46#include "bgpd/bgp_lcommunity.h"
3f9c7369 47#include "bgpd/bgp_updgrp.h"
6407da5a 48#include "bgpd/bgp_encap_types.h"
65efcfce 49#if ENABLE_BGP_VNC
d62a17ae 50#include "bgpd/rfapi/bgp_rfapi_cfg.h"
51#include "bgp_encap_types.h"
52#include "bgp_vnc_types.h"
65efcfce 53#endif
b18825eb
PG		 54#include "bgp_encap_types.h"
55#include "bgp_evpn.h"
7c40bf39 56#include "bgp_flowspec_private.h"
6b0655a2 57
718e3744 58/* Attribute strings for logging. */
d62a17ae 59static const struct message attr_str[] = {
60 {BGP_ATTR_ORIGIN, "ORIGIN"},
61 {BGP_ATTR_AS_PATH, "AS_PATH"},
62 {BGP_ATTR_NEXT_HOP, "NEXT_HOP"},
63 {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"},
64 {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"},
65 {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"},
66 {BGP_ATTR_AGGREGATOR, "AGGREGATOR"},
67 {BGP_ATTR_COMMUNITIES, "COMMUNITY"},
68 {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"},
69 {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"},
70 {BGP_ATTR_DPA, "DPA"},
71 {BGP_ATTR_ADVERTISER, "ADVERTISER"},
72 {BGP_ATTR_RCID_PATH, "RCID_PATH"},
73 {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"},
74 {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"},
75 {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"},
76 {BGP_ATTR_AS4_PATH, "AS4_PATH"},
77 {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"},
78 {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"},
a21bd7a3 79 {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"},
d62a17ae 80 {BGP_ATTR_ENCAP, "ENCAP"},
65efcfce 81#if ENABLE_BGP_VNC
d62a17ae 82 {BGP_ATTR_VNC, "VNC"},
65efcfce 83#endif
d62a17ae 84 {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"},
85 {BGP_ATTR_PREFIX_SID, "PREFIX_SID"},
86 {0}};
afcb7679 87
996c9314
LB		 88static const struct message attr_flag_str[] = {
89 {BGP_ATTR_FLAG_OPTIONAL, "Optional"},
90 {BGP_ATTR_FLAG_TRANS, "Transitive"},
91 {BGP_ATTR_FLAG_PARTIAL, "Partial"},
92 /* bgp_attr_flags_diagnose() relies on this bit being last in
93 this list */
94 {BGP_ATTR_FLAG_EXTLEN, "Extended Length"},
95 {0}};
6b0655a2 96
9bddac4b 97static struct hash *cluster_hash;
718e3744 98
d62a17ae 99static void *cluster_hash_alloc(void *p)
718e3744 100{
d62a17ae 101 const struct cluster_list *val = (const struct cluster_list *)p;
102 struct cluster_list *cluster;
718e3744 103
d62a17ae 104 cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list));
105 cluster->length = val->length;
718e3744 106
d62a17ae 107 if (cluster->length) {
108 cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length);
109 memcpy(cluster->list, val->list, val->length);
110 } else
111 cluster->list = NULL;
718e3744 112
d62a17ae 113 cluster->refcnt = 0;
718e3744 114
d62a17ae 115 return cluster;
718e3744 116}
117
118/* Cluster list related functions. */
d62a17ae 119static struct cluster_list *cluster_parse(struct in_addr *pnt, int length)
718e3744 120{
d62a17ae 121 struct cluster_list tmp;
122 struct cluster_list *cluster;
718e3744 123
d62a17ae 124 tmp.length = length;
125 tmp.list = pnt;
718e3744 126
d62a17ae 127 cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc);
128 cluster->refcnt++;
129 return cluster;
718e3744 130}
131
d62a17ae 132int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator)
718e3744 133{
d62a17ae 134 int i;
135
136 for (i = 0; i < cluster->length / 4; i++)
137 if (cluster->list[i].s_addr == originator.s_addr)
138 return 1;
139 return 0;
718e3744 140}
141
d62a17ae 142static unsigned int cluster_hash_key_make(void *p)
718e3744 143{
d62a17ae 144 const struct cluster_list *cluster = p;
718e3744 145
d62a17ae 146 return jhash(cluster->list, cluster->length, 0);
718e3744 147}
148
d62a17ae 149static int cluster_hash_cmp(const void *p1, const void *p2)
718e3744 150{
d62a17ae 151 const struct cluster_list *cluster1 = p1;
152 const struct cluster_list *cluster2 = p2;
923de654 153
d62a17ae 154 return (cluster1->length == cluster2->length
155 && memcmp(cluster1->list, cluster2->list, cluster1->length)
156 == 0);
718e3744 157}
158
d62a17ae 159static void cluster_free(struct cluster_list *cluster)
718e3744 160{
d62a17ae 161 if (cluster->list)
162 XFREE(MTYPE_CLUSTER_VAL, cluster->list);
163 XFREE(MTYPE_CLUSTER, cluster);
718e3744 164}
165
d62a17ae 166static struct cluster_list *cluster_intern(struct cluster_list *cluster)
718e3744 167{
d62a17ae 168 struct cluster_list *find;
718e3744 169
d62a17ae 170 find = hash_get(cluster_hash, cluster, cluster_hash_alloc);
171 find->refcnt++;
718e3744 172
d62a17ae 173 return find;
718e3744 174}
175
d62a17ae 176void cluster_unintern(struct cluster_list *cluster)
718e3744 177{
d62a17ae 178 if (cluster->refcnt)
179 cluster->refcnt--;
718e3744 180
d62a17ae 181 if (cluster->refcnt == 0) {
182 hash_release(cluster_hash, cluster);
183 cluster_free(cluster);
184 }
718e3744 185}
186
d62a17ae 187static void cluster_init(void)
718e3744 188{
996c9314 189 cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp,
3f65c5b1 190 "BGP Cluster");
718e3744 191}
228da428 192
d62a17ae 193static void cluster_finish(void)
228da428 194{
d62a17ae 195 hash_clean(cluster_hash, (void (*)(void *))cluster_free);
196 hash_free(cluster_hash);
197 cluster_hash = NULL;
228da428 198}
6b0655a2 199
bede7744
LB		 200static struct hash *encap_hash = NULL;
201#if ENABLE_BGP_VNC
202static struct hash *vnc_hash = NULL;
203#endif
204
d62a17ae 205struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig)
f4c89855 206{
d62a17ae 207 struct bgp_attr_encap_subtlv *new;
208 struct bgp_attr_encap_subtlv *tail;
209 struct bgp_attr_encap_subtlv *p;
f4c89855 210
d62a17ae 211 for (p = orig, tail = new = NULL; p; p = p->next) {
12f70478 212 int size = sizeof(struct bgp_attr_encap_subtlv) + p->length;
d62a17ae 213 if (tail) {
214 tail->next = XCALLOC(MTYPE_ENCAP_TLV, size);
215 tail = tail->next;
216 } else {
217 tail = new = XCALLOC(MTYPE_ENCAP_TLV, size);
218 }
219 assert(tail);
220 memcpy(tail, p, size);
221 tail->next = NULL;
f4c89855 222 }
f4c89855 223
d62a17ae 224 return new;
f4c89855
LB		 225}
226
d62a17ae 227static void encap_free(struct bgp_attr_encap_subtlv *p)
f4c89855 228{
d62a17ae 229 struct bgp_attr_encap_subtlv *next;
230 while (p) {
231 next = p->next;
232 p->next = NULL;
233 XFREE(MTYPE_ENCAP_TLV, p);
234 p = next;
235 }
f4c89855
LB		 236}
237
d62a17ae 238void bgp_attr_flush_encap(struct attr *attr)
f4c89855 239{
d62a17ae 240 if (!attr)
241 return;
f4c89855 242
d62a17ae 243 if (attr->encap_subtlvs) {
244 encap_free(attr->encap_subtlvs);
245 attr->encap_subtlvs = NULL;
246 }
65efcfce 247#if ENABLE_BGP_VNC
d62a17ae 248 if (attr->vnc_subtlvs) {
249 encap_free(attr->vnc_subtlvs);
250 attr->vnc_subtlvs = NULL;
251 }
65efcfce 252#endif
f4c89855
LB		 253}
254
255/*
256 * Compare encap sub-tlv chains
257 *
258 * 1 = equivalent
259 * 0 = not equivalent
260 *
261 * This algorithm could be made faster if needed
262 */
d62a17ae 263static int encap_same(struct bgp_attr_encap_subtlv *h1,
264 struct bgp_attr_encap_subtlv *h2)
f4c89855 265{
d62a17ae 266 struct bgp_attr_encap_subtlv *p;
267 struct bgp_attr_encap_subtlv *q;
f4c89855 268
d62a17ae 269 if (h1 == h2)
270 return 1;
271 if (h1 == NULL || h2 == NULL)
272 return 0;
f4c89855 273
d62a17ae 274 for (p = h1; p; p = p->next) {
275 for (q = h2; q; q = q->next) {
276 if ((p->type == q->type) && (p->length == q->length)
277 && !memcmp(p->value, q->value, p->length)) {
f4c89855 278
d62a17ae 279 break;
280 }
281 }
282 if (!q)
283 return 0;
f4c89855 284 }
f4c89855 285
d62a17ae 286 for (p = h2; p; p = p->next) {
287 for (q = h1; q; q = q->next) {
288 if ((p->type == q->type) && (p->length == q->length)
289 && !memcmp(p->value, q->value, p->length)) {
f4c89855 290
d62a17ae 291 break;
292 }
293 }
294 if (!q)
295 return 0;
f4c89855 296 }
f4c89855 297
d62a17ae 298 return 1;
f4c89855
LB		 299}
300
d62a17ae 301static void *encap_hash_alloc(void *p)
bede7744 302{
d62a17ae 303 /* Encap structure is already allocated. */
304 return p;
bede7744
LB		 305}
306
d62a17ae 307typedef enum {
308 ENCAP_SUBTLV_TYPE,
bede7744 309#if ENABLE_BGP_VNC
d62a17ae 310 VNC_SUBTLV_TYPE
bede7744
LB		 311#endif
312} encap_subtlv_type;
313
314static struct bgp_attr_encap_subtlv *
d62a17ae 315encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type)
bede7744 316{
d62a17ae 317 struct bgp_attr_encap_subtlv *find;
318 struct hash *hash = encap_hash;
bede7744 319#if ENABLE_BGP_VNC
d62a17ae 320 if (type == VNC_SUBTLV_TYPE)
321 hash = vnc_hash;
bede7744
LB		 322#endif
323
d62a17ae 324 find = hash_get(hash, encap, encap_hash_alloc);
325 if (find != encap)
326 encap_free(encap);
327 find->refcnt++;
bede7744 328
d62a17ae 329 return find;
bede7744
LB		 330}
331
d62a17ae 332static void encap_unintern(struct bgp_attr_encap_subtlv **encapp,
333 encap_subtlv_type type)
bede7744 334{
d62a17ae 335 struct bgp_attr_encap_subtlv *encap = *encapp;
336 if (encap->refcnt)
337 encap->refcnt--;
bede7744 338
d62a17ae 339 if (encap->refcnt == 0) {
340 struct hash *hash = encap_hash;
bede7744 341#if ENABLE_BGP_VNC
d62a17ae 342 if (type == VNC_SUBTLV_TYPE)
343 hash = vnc_hash;
bede7744 344#endif
d62a17ae 345 hash_release(hash, encap);
346 encap_free(encap);
347 *encapp = NULL;
348 }
bede7744
LB		 349}
350
d62a17ae 351static unsigned int encap_hash_key_make(void *p)
bede7744 352{
d62a17ae 353 const struct bgp_attr_encap_subtlv *encap = p;
bede7744 354
d62a17ae 355 return jhash(encap->value, encap->length, 0);
bede7744
LB		 356}
357
d62a17ae 358static int encap_hash_cmp(const void *p1, const void *p2)
bede7744 359{
d62a17ae 360 return encap_same((struct bgp_attr_encap_subtlv *)p1,
361 (struct bgp_attr_encap_subtlv *)p2);
bede7744
LB		 362}
363
d62a17ae 364static void encap_init(void)
bede7744 365{
996c9314 366 encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp,
3f65c5b1 367 "BGP Encap Hash");
bede7744 368#if ENABLE_BGP_VNC
996c9314 369 vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp,
3f65c5b1 370 "BGP VNC Hash");
bede7744
LB		 371#endif
372}
373
d62a17ae 374static void encap_finish(void)
bede7744 375{
d62a17ae 376 hash_clean(encap_hash, (void (*)(void *))encap_free);
377 hash_free(encap_hash);
378 encap_hash = NULL;
bede7744 379#if ENABLE_BGP_VNC
d62a17ae 380 hash_clean(vnc_hash, (void (*)(void *))encap_free);
381 hash_free(vnc_hash);
382 vnc_hash = NULL;
bede7744
LB		 383#endif
384}
385
d62a17ae 386static bool overlay_index_same(const struct attr *a1, const struct attr *a2)
684a7227 387{
d62a17ae 388 if (!a1 && a2)
389 return false;
390 if (!a2 && a1)
391 return false;
392 if (!a1 && !a2)
393 return true;
394 return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay),
395 sizeof(struct overlay_index));
684a7227
PG		 396}
397
718e3744 398/* Unknown transit attribute. */
9bddac4b 399static struct hash *transit_hash;
718e3744 400
d62a17ae 401static void transit_free(struct transit *transit)
718e3744 402{
d62a17ae 403 if (transit->val)
404 XFREE(MTYPE_TRANSIT_VAL, transit->val);
405 XFREE(MTYPE_TRANSIT, transit);
718e3744 406}
407
d62a17ae 408static void *transit_hash_alloc(void *p)
718e3744 409{
d62a17ae 410 /* Transit structure is already allocated. */
411 return p;
718e3744 412}
413
d62a17ae 414static struct transit *transit_intern(struct transit *transit)
718e3744 415{
d62a17ae 416 struct transit *find;
718e3744 417
d62a17ae 418 find = hash_get(transit_hash, transit, transit_hash_alloc);
419 if (find != transit)
420 transit_free(transit);
421 find->refcnt++;
718e3744 422
d62a17ae 423 return find;
718e3744 424}
425
d62a17ae 426void transit_unintern(struct transit *transit)
718e3744 427{
d62a17ae 428 if (transit->refcnt)
429 transit->refcnt--;
718e3744 430
d62a17ae 431 if (transit->refcnt == 0) {
432 hash_release(transit_hash, transit);
433 transit_free(transit);
434 }
718e3744 435}
436
d62a17ae 437static unsigned int transit_hash_key_make(void *p)
718e3744 438{
d62a17ae 439 const struct transit *transit = p;
718e3744 440
d62a17ae 441 return jhash(transit->val, transit->length, 0);
718e3744 442}
443
d62a17ae 444static int transit_hash_cmp(const void *p1, const void *p2)
718e3744 445{
d62a17ae 446 const struct transit *transit1 = p1;
447 const struct transit *transit2 = p2;
923de654 448
d62a17ae 449 return (transit1->length == transit2->length
450 && memcmp(transit1->val, transit2->val, transit1->length) == 0);
718e3744 451}
452
d62a17ae 453static void transit_init(void)
718e3744 454{
996c9314 455 transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp,
3f65c5b1 456 "BGP Transit Hash");
718e3744 457}
228da428 458
d62a17ae 459static void transit_finish(void)
228da428 460{
d62a17ae 461 hash_clean(transit_hash, (void (*)(void *))transit_free);
462 hash_free(transit_hash);
463 transit_hash = NULL;
228da428 464}
6b0655a2 465
718e3744 466/* Attribute hash routines. */
9bddac4b 467static struct hash *attrhash;
718e3744 468
fb982c25
PJ		 469/* Shallow copy of an attribute
470 * Though, not so shallow that it doesn't copy the contents
471 * of the attr_extra pointed to by 'extra'
472 */
d62a17ae 473void bgp_attr_dup(struct attr *new, struct attr *orig)
fb982c25 474{
d62a17ae 475 *new = *orig;
fb982c25
PJ		 476}
477
d62a17ae 478unsigned long int attr_count(void)
cbdfbaa5 479{
d62a17ae 480 return attrhash->count;
cbdfbaa5
PJ		 481}
482
d62a17ae 483unsigned long int attr_unknown_count(void)
cbdfbaa5 484{
d62a17ae 485 return transit_hash->count;
cbdfbaa5
PJ		 486}
487
d62a17ae 488unsigned int attrhash_key_make(void *p)
718e3744 489{
d62a17ae 490 const struct attr *attr = (struct attr *)p;
491 uint32_t key = 0;
c8e7b895 492#define MIX(val) key = jhash_1word(val, key)
0d0268a6 493#define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key)
c8e7b895 494
0d0268a6 495 MIX3(attr->origin, attr->nexthop.s_addr, attr->med);
996c9314
LB		 496 MIX3(attr->local_pref, attr->aggregator_as,
497 attr->aggregator_addr.s_addr);
0d0268a6
LB		 498 MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr,
499 attr->originator_id.s_addr);
500 MIX3(attr->tag, attr->label, attr->label_index);
d62a17ae 501
502 if (attr->aspath)
503 MIX(aspath_key_make(attr->aspath));
504 if (attr->community)
505 MIX(community_hash_make(attr->community));
506
507 if (attr->lcommunity)
508 MIX(lcommunity_hash_make(attr->lcommunity));
509 if (attr->ecommunity)
510 MIX(ecommunity_hash_make(attr->ecommunity));
511 if (attr->cluster)
512 MIX(cluster_hash_key_make(attr->cluster));
513 if (attr->transit)
514 MIX(transit_hash_key_make(attr->transit));
515 if (attr->encap_subtlvs)
516 MIX(encap_hash_key_make(attr->encap_subtlvs));
bede7744 517#if ENABLE_BGP_VNC
d62a17ae 518 if (attr->vnc_subtlvs)
519 MIX(encap_hash_key_make(attr->vnc_subtlvs));
bede7744 520#endif
d62a17ae 521 MIX(attr->mp_nexthop_len);
522 key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key);
523 key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key);
77e62f2b 524 MIX(attr->nh_ifindex);
525 MIX(attr->nh_lla_ifindex);
d62a17ae 526
527 return key;
528}
529
530int attrhash_cmp(const void *p1, const void *p2)
531{
532 const struct attr *attr1 = p1;
533 const struct attr *attr2 = p2;
534
535 if (attr1->flag == attr2->flag && attr1->origin == attr2->origin
536 && attr1->nexthop.s_addr == attr2->nexthop.s_addr
537 && attr1->aspath == attr2->aspath
538 && attr1->community == attr2->community && attr1->med == attr2->med
539 && attr1->local_pref == attr2->local_pref
540 && attr1->rmap_change_flags == attr2->rmap_change_flags) {
541 if (attr1->aggregator_as == attr2->aggregator_as
542 && attr1->aggregator_addr.s_addr
543 == attr2->aggregator_addr.s_addr
544 && attr1->weight == attr2->weight
545 && attr1->tag == attr2->tag
546 && attr1->label_index == attr2->label_index
547 && attr1->mp_nexthop_len == attr2->mp_nexthop_len
d62a17ae 548 && attr1->ecommunity == attr2->ecommunity
549 && attr1->lcommunity == attr2->lcommunity
550 && attr1->cluster == attr2->cluster
551 && attr1->transit == attr2->transit
552 && (attr1->encap_tunneltype == attr2->encap_tunneltype)
553 && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs)
65efcfce 554#if ENABLE_BGP_VNC
d62a17ae 555 && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs)
65efcfce 556#endif
0d0268a6
LB		 557 && IPV6_ADDR_SAME(&attr1->mp_nexthop_global,
558 &attr2->mp_nexthop_global)
559 && IPV6_ADDR_SAME(&attr1->mp_nexthop_local,
560 &attr2->mp_nexthop_local)
561 && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in,
562 &attr2->mp_nexthop_global_in)
d62a17ae 563 && IPV4_ADDR_SAME(&attr1->originator_id,
564 &attr2->originator_id)
77e62f2b 565 && overlay_index_same(attr1, attr2)
566 && attr1->nh_ifindex == attr2->nh_ifindex
567 && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex)
d62a17ae 568 return 1;
569 }
aadc0905 570
d62a17ae 571 return 0;
718e3744 572}
573
d62a17ae 574static void attrhash_init(void)
718e3744 575{
996c9314
LB		 576 attrhash =
577 hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes");
718e3744 578}
579
289d2501
LB		 580/*
581 * special for hash_clean below
582 */
d62a17ae 583static void attr_vfree(void *attr)
289d2501 584{
d62a17ae 585 XFREE(MTYPE_ATTR, attr);
289d2501
LB		 586}
587
d62a17ae 588static void attrhash_finish(void)
228da428 589{
d62a17ae 590 hash_clean(attrhash, attr_vfree);
591 hash_free(attrhash);
592 attrhash = NULL;
228da428
CC		 593}
594
d62a17ae 595static void attr_show_all_iterator(struct hash_backet *backet, struct vty *vty)
718e3744 596{
d62a17ae 597 struct attr *attr = backet->data;
718e3744 598
d62a17ae 599 vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt,
600 inet_ntoa(attr->nexthop));
13b7e7f0 601 vty_out(vty, "\tflags: %" PRIu64 " med: %u local_pref: %u origin: %u weight: %u label: %u\n",
23a2a47e 602 attr->flag, attr->med, attr->local_pref, attr->origin,
13b7e7f0 603 attr->weight, attr->label);
718e3744 604}
605
d62a17ae 606void attr_show_all(struct vty *vty)
718e3744 607{
9d303b37
DL		 608 hash_iterate(attrhash, (void (*)(struct hash_backet *,
609 void *))attr_show_all_iterator,
610 vty);
718e3744 611}
612
d62a17ae 613static void *bgp_attr_hash_alloc(void *p)
718e3744 614{
d62a17ae 615 struct attr *val = (struct attr *)p;
616 struct attr *attr;
718e3744 617
d62a17ae 618 attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr));
619 *attr = *val;
620 if (val->encap_subtlvs) {
621 val->encap_subtlvs = NULL;
622 }
65efcfce 623#if ENABLE_BGP_VNC
d62a17ae 624 if (val->vnc_subtlvs) {
625 val->vnc_subtlvs = NULL;
626 }
65efcfce 627#endif
d62a17ae 628 attr->refcnt = 0;
629 return attr;
718e3744 630}
631
632/* Internet argument attribute. */
d62a17ae 633struct attr *bgp_attr_intern(struct attr *attr)
634{
635 struct attr *find;
636
637 /* Intern referenced strucutre. */
638 if (attr->aspath) {
639 if (!attr->aspath->refcnt)
640 attr->aspath = aspath_intern(attr->aspath);
641 else
642 attr->aspath->refcnt++;
643 }
644 if (attr->community) {
645 if (!attr->community->refcnt)
646 attr->community = community_intern(attr->community);
647 else
648 attr->community->refcnt++;
649 }
650
651 if (attr->ecommunity) {
652 if (!attr->ecommunity->refcnt)
653 attr->ecommunity = ecommunity_intern(attr->ecommunity);
654 else
655 attr->ecommunity->refcnt++;
656 }
657 if (attr->lcommunity) {
658 if (!attr->lcommunity->refcnt)
659 attr->lcommunity = lcommunity_intern(attr->lcommunity);
660 else
661 attr->lcommunity->refcnt++;
662 }
663 if (attr->cluster) {
664 if (!attr->cluster->refcnt)
665 attr->cluster = cluster_intern(attr->cluster);
666 else
667 attr->cluster->refcnt++;
668 }
669 if (attr->transit) {
670 if (!attr->transit->refcnt)
671 attr->transit = transit_intern(attr->transit);
672 else
673 attr->transit->refcnt++;
674 }
675 if (attr->encap_subtlvs) {
676 if (!attr->encap_subtlvs->refcnt)
677 attr->encap_subtlvs = encap_intern(attr->encap_subtlvs,
678 ENCAP_SUBTLV_TYPE);
679 else
680 attr->encap_subtlvs->refcnt++;
681 }
bede7744 682#if ENABLE_BGP_VNC
d62a17ae 683 if (attr->vnc_subtlvs) {
684 if (!attr->vnc_subtlvs->refcnt)
685 attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs,
686 VNC_SUBTLV_TYPE);
687 else
688 attr->vnc_subtlvs->refcnt++;
689 }
aadc0905 690#endif
bede7744 691
dbbac180
DL		 692 /* At this point, attr only contains intern'd pointers. that means
693 * if we find it in attrhash, it has all the same pointers and we
694 * correctly updated the refcounts on these.
695 * If we don't find it, we need to allocate a one because in all
696 * cases this returns a new reference to a hashed attr, but the input
697 * wasn't on hash. */
d62a17ae 698 find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc);
699 find->refcnt++;
700
701 return find;
718e3744 702}
703
704/* Make network statement's attribute. */
d7c0a89a 705struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin)
718e3744 706{
d62a17ae 707 memset(attr, 0, sizeof(struct attr));
03e214c8 708
d62a17ae 709 attr->origin = origin;
710 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN);
711 attr->aspath = aspath_empty();
712 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH);
713 attr->weight = BGP_ATTR_DEFAULT_WEIGHT;
714 attr->tag = 0;
715 attr->label_index = BGP_INVALID_LABEL_INDEX;
716 attr->label = MPLS_INVALID_LABEL;
717 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
718 attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
719
720 return attr;
718e3744 721}
722
b5d58c32 723/* Create the attributes for an aggregate */
d7c0a89a 724struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, uint8_t origin,
d62a17ae 725 struct aspath *aspath,
726 struct community *community, int as_set,
d7c0a89a 727 uint8_t atomic_aggregate)
d62a17ae 728{
729 struct attr attr;
730 struct attr *new;
731
732 memset(&attr, 0, sizeof(struct attr));
733
734 /* Origin attribute. */
735 attr.origin = origin;
736 attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN);
737
738 /* AS path attribute. */
739 if (aspath)
740 attr.aspath = aspath_intern(aspath);
741 else
742 attr.aspath = aspath_empty();
743 attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH);
744
745 /* Next hop attribute. */
746 attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
747
748 if (community) {
d7c0a89a 749 uint32_t gshut = COMMUNITY_GSHUT;
7f323236
DW		 750
751 /* If we are not shutting down ourselves and we are
752 * aggregating a route that contains the GSHUT community we
753 * need to remove that community when creating the aggregate */
996c9314
LB		 754 if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)
755 && community_include(community, gshut)) {
7f323236
DW		 756 community_del_val(community, &gshut);
757 }
758
d62a17ae 759 attr.community = community;
760 attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES);
761 }
762
7f323236
DW		 763 if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) {
764 bgp_attr_add_gshut_community(&attr);
765 }
766
d62a17ae 767 attr.label_index = BGP_INVALID_LABEL_INDEX;
768 attr.label = MPLS_INVALID_LABEL;
769 attr.weight = BGP_ATTR_DEFAULT_WEIGHT;
770 attr.mp_nexthop_len = IPV6_MAX_BYTELEN;
771 if (!as_set || atomic_aggregate)
772 attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE);
773 attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR);
774 if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION))
775 attr.aggregator_as = bgp->confed_id;
776 else
777 attr.aggregator_as = bgp->as;
778 attr.aggregator_addr = bgp->router_id;
779 attr.label_index = BGP_INVALID_LABEL_INDEX;
780 attr.label = MPLS_INVALID_LABEL;
781
782 new = bgp_attr_intern(&attr);
783
784 aspath_unintern(&new->aspath);
785 return new;
718e3744 786}
787
b881c707 788/* Unintern just the sub-components of the attr, but not the attr */
d62a17ae 789void bgp_attr_unintern_sub(struct attr *attr)
790{
791 /* aspath refcount shoud be decrement. */
792 if (attr->aspath)
793 aspath_unintern(&attr->aspath);
794 UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH));
795
796 if (attr->community)
797 community_unintern(&attr->community);
798 UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES));
799
800 if (attr->ecommunity)
801 ecommunity_unintern(&attr->ecommunity);
802 UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES));
803
804 if (attr->lcommunity)
805 lcommunity_unintern(&attr->lcommunity);
806 UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES));
807
808 if (attr->cluster)
809 cluster_unintern(attr->cluster);
810 UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST));
811
812 if (attr->transit)
813 transit_unintern(attr->transit);
814
815 if (attr->encap_subtlvs)
816 encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE);
bede7744
LB		 817
818#if ENABLE_BGP_VNC
d62a17ae 819 if (attr->vnc_subtlvs)
820 encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE);
bede7744 821#endif
b881c707
PJ		 822}
823
f46d8e1e
DS		 824/*
825 * We have some show commands that let you experimentally
826 * apply a route-map. When we apply the route-map
827 * we are reseting values but not saving them for
828 * posterity via intern'ing( because route-maps don't
829 * do that) but at this point in time we need
830 * to compare the new attr to the old and if the
831 * routemap has changed it we need to, as Snoop Dog says,
832 * Drop it like it's hot
833 */
834void bgp_attr_undup(struct attr *new, struct attr *old)
835{
836 if (new->aspath != old->aspath)
837 aspath_free(new->aspath);
838
839 if (new->community != old->community)
840 community_free(new->community);
841
842 if (new->ecommunity != old->ecommunity)
843 ecommunity_free(&new->ecommunity);
844
845 if (new->lcommunity != old->lcommunity)
846 lcommunity_free(&new->lcommunity);
f46d8e1e
DS		 847}
848
718e3744 849/* Free bgp attribute and aspath. */
d62a17ae 850void bgp_attr_unintern(struct attr **pattr)
851{
852 struct attr *attr = *pattr;
853 struct attr *ret;
854 struct attr tmp;
855
856 /* Decrement attribute reference. */
857 attr->refcnt--;
858
859 tmp = *attr;
860
861 /* If reference becomes zero then free attribute object. */
862 if (attr->refcnt == 0) {
863 ret = hash_release(attrhash, attr);
864 assert(ret != NULL);
865 XFREE(MTYPE_ATTR, attr);
866 *pattr = NULL;
867 }
868
869 bgp_attr_unintern_sub(&tmp);
870}
871
872void bgp_attr_flush(struct attr *attr)
873{
874 if (attr->aspath && !attr->aspath->refcnt) {
875 aspath_free(attr->aspath);
876 attr->aspath = NULL;
877 }
878 if (attr->community && !attr->community->refcnt) {
879 community_free(attr->community);
880 attr->community = NULL;
881 }
882
883 if (attr->ecommunity && !attr->ecommunity->refcnt)
884 ecommunity_free(&attr->ecommunity);
885 if (attr->lcommunity && !attr->lcommunity->refcnt)
886 lcommunity_free(&attr->lcommunity);
887 if (attr->cluster && !attr->cluster->refcnt) {
888 cluster_free(attr->cluster);
889 attr->cluster = NULL;
890 }
891 if (attr->transit && !attr->transit->refcnt) {
892 transit_free(attr->transit);
893 attr->transit = NULL;
894 }
895 if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) {
896 encap_free(attr->encap_subtlvs);
897 attr->encap_subtlvs = NULL;
898 }
65efcfce 899#if ENABLE_BGP_VNC
d62a17ae 900 if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) {
901 encap_free(attr->vnc_subtlvs);
902 attr->vnc_subtlvs = NULL;
903 }
aadc0905 904#endif
718e3744 905}
906
b881c707
PJ		 907/* Implement draft-scudder-idr-optional-transitive behaviour and
908 * avoid resetting sessions for malformed attributes which are
909 * are partial/optional and hence where the error likely was not
910 * introduced by the sending neighbour.
911 */
912static bgp_attr_parse_ret_t
d7c0a89a 913bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode,
d62a17ae 914 bgp_size_t length)
915{
916 struct peer *const peer = args->peer;
d7c0a89a 917 const uint8_t flags = args->flags;
d62a17ae 918 /* startp and length must be special-cased, as whether or not to
919 * send the attribute data with the NOTIFY depends on the error,
920 * the caller therefore signals this with the seperate length argument
921 */
d7c0a89a 922 uint8_t *notify_datap = (length > 0 ? args->startp : NULL);
d62a17ae 923
924 /* Only relax error handling for eBGP peers */
925 if (peer->sort != BGP_PEER_EBGP) {
926 bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode,
927 notify_datap, length);
928 return BGP_ATTR_PARSE_ERROR;
929 }
930
931 /* Adjust the stream getp to the end of the attribute, in case we can
932 * still proceed but the caller hasn't read all the attribute.
933 */
934 stream_set_getp(BGP_INPUT(peer),
935 (args->startp - STREAM_DATA(BGP_INPUT(peer)))
936 + args->total);
937
938 switch (args->type) {
939 /* where an attribute is relatively inconsequential, e.g. it does not
940 * affect route selection, and can be safely ignored, then any such
941 * attributes which are malformed should just be ignored and the route
942 * processed as normal.
943 */
944 case BGP_ATTR_AS4_AGGREGATOR:
945 case BGP_ATTR_AGGREGATOR:
946 case BGP_ATTR_ATOMIC_AGGREGATE:
947 return BGP_ATTR_PARSE_PROCEED;
948
949 /* Core attributes, particularly ones which may influence route
950 * selection, should always cause session resets
951 */
952 case BGP_ATTR_ORIGIN:
953 case BGP_ATTR_AS_PATH:
954 case BGP_ATTR_NEXT_HOP:
955 case BGP_ATTR_MULTI_EXIT_DISC:
956 case BGP_ATTR_LOCAL_PREF:
957 case BGP_ATTR_COMMUNITIES:
958 case BGP_ATTR_ORIGINATOR_ID:
959 case BGP_ATTR_CLUSTER_LIST:
960 case BGP_ATTR_MP_REACH_NLRI:
961 case BGP_ATTR_MP_UNREACH_NLRI:
962 case BGP_ATTR_EXT_COMMUNITIES:
963 bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode,
964 notify_datap, length);
965 return BGP_ATTR_PARSE_ERROR;
966 }
967
968 /* Partial optional attributes that are malformed should not cause
969 * the whole session to be reset. Instead treat it as a withdrawal
970 * of the routes, if possible.
971 */
972 if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)
973 && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)
974 && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL))
975 return BGP_ATTR_PARSE_WITHDRAW;
976
977 /* default to reset */
978 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
b881c707
PJ		 979}
980
afcb7679
DO		 981/* Find out what is wrong with the path attribute flag bits and log the error.
982 "Flag bits" here stand for Optional, Transitive and Partial, but not for
983 Extended Length. Checking O/T/P bits at once implies, that the attribute
984 being diagnosed is defined by RFC as either a "well-known" or an "optional,
985 non-transitive" attribute. */
986static void
d62a17ae 987bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args,
d7c0a89a
QY		 988 uint8_t desired_flags /* how RFC says it must be */
989)
d62a17ae 990{
d7c0a89a
QY		 991 uint8_t seen = 0, i;
992 uint8_t real_flags = args->flags;
993 const uint8_t attr_code = args->type;
d62a17ae 994
995 desired_flags &= ~BGP_ATTR_FLAG_EXTLEN;
996 real_flags &= ~BGP_ATTR_FLAG_EXTLEN;
997 for (i = 0; i <= 2; i++) /* O,T,P, but not E */
998 if (CHECK_FLAG(desired_flags, attr_flag_str[i].key)
999 != CHECK_FLAG(real_flags, attr_flag_str[i].key)) {
af4c2728 1000 flog_err(
14454c9f
DS		 1001 BGP_ERR_ATTR_FLAG,
1002 "%s attribute must%s be flagged as \"%s\"",
1003 lookup_msg(attr_str, attr_code, NULL),
1004 CHECK_FLAG(desired_flags, attr_flag_str[i].key)
1005 ? ""
1006 : " not",
1007 attr_flag_str[i].str);
d62a17ae 1008 seen = 1;
1009 }
1010 if (!seen) {
1011 zlog_debug(
1012 "Strange, %s called for attr %s, but no problem found with flags"
1013 " (real flags 0x%x, desired 0x%x)",
1014 __func__, lookup_msg(attr_str, attr_code, NULL),
1015 real_flags, desired_flags);
1016 }
afcb7679
DO		 1017}
1018
3ecab4c8
PJ		 1019/* Required flags for attributes. EXTLEN will be masked off when testing,
1020 * as will PARTIAL for optional+transitive attributes.
1021 */
d7c0a89a
QY		 1022const uint8_t attr_flags_values[] = {
1023 [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS,
1024 [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS,
1025 [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS,
1026 [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL,
1027 [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS,
1028 [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS,
1029 [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL,
1030 [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL,
1031 [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL,
1032 [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL,
1033 [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL,
1034 [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL,
1035 [BGP_ATTR_EXT_COMMUNITIES] =
1036 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
1037 [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
1038 [BGP_ATTR_AS4_AGGREGATOR] =
1039 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
1040 [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
1041 [BGP_ATTR_LARGE_COMMUNITIES] =
1042 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
1043 [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
3ecab4c8 1044};
099111ef 1045static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1;
3ecab4c8 1046
d62a17ae 1047static int bgp_attr_flag_invalid(struct bgp_attr_parser_args *args)
1048{
d7c0a89a
QY		 1049 uint8_t mask = BGP_ATTR_FLAG_EXTLEN;
1050 const uint8_t flags = args->flags;
1051 const uint8_t attr_code = args->type;
d62a17ae 1052
1053 /* there may be attributes we don't know about */
1054 if (attr_code > attr_flags_values_max)
1055 return 0;
1056 if (attr_flags_values[attr_code] == 0)
1057 return 0;
1058
1059 /* RFC4271, "For well-known attributes, the Transitive bit MUST be set
1060 * to
1061 * 1."
1062 */
1063 if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags)
1064 && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) {
af4c2728 1065 flog_err(
14454c9f 1066 BGP_ERR_ATTR_FLAG,
d62a17ae 1067 "%s well-known attributes must have transitive flag set (%x)",
1068 lookup_msg(attr_str, attr_code, NULL), flags);
1069 return 1;
1070 }
1071
1072 /* "For well-known attributes and for optional non-transitive
1073 * attributes,
1074 * the Partial bit MUST be set to 0."
1075 */
1076 if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) {
1077 if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) {
af4c2728 1078 flog_err(BGP_ERR_ATTR_FLAG,
14454c9f
DS		 1079 "%s well-known attribute "
1080 "must NOT have the partial flag set (%x)",
1081 lookup_msg(attr_str, attr_code, NULL), flags);
d62a17ae 1082 return 1;
1083 }
1084 if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)
1085 && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) {
af4c2728 1086 flog_err(BGP_ERR_ATTR_FLAG,
14454c9f
DS		 1087 "%s optional + transitive attribute "
1088 "must NOT have the partial flag set (%x)",
1089 lookup_msg(attr_str, attr_code, NULL), flags);
d62a17ae 1090 return 1;
1091 }
1092 }
1093
1094 /* Optional transitive attributes may go through speakers that don't
1095 * reocgnise them and set the Partial bit.
1096 */
1097 if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)
1098 && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS))
1099 SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL);
1100
1101 if ((flags & ~mask) == attr_flags_values[attr_code])
1102 return 0;
1103
1104 bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]);
1105 return 1;
3ecab4c8
PJ		 1106}
1107
718e3744 1108/* Get origin attribute of the update message. */
d62a17ae 1109static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args)
1110{
1111 struct peer *const peer = args->peer;
1112 struct attr *const attr = args->attr;
1113 const bgp_size_t length = args->length;
1114
1115 /* If any recognized attribute has Attribute Length that conflicts
1116 with the expected length (based on the attribute type code), then
1117 the Error Subcode is set to Attribute Length Error. The Data
1118 field contains the erroneous attribute (type, length and
1119 value). */
1120 if (length != 1) {
af4c2728 1121 flog_err(BGP_ERR_ATTR_LEN,
14454c9f 1122 "Origin attribute length is not one %d", length);
d62a17ae 1123 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1124 args->total);
1125 }
1126
1127 /* Fetch origin attribute. */
1128 attr->origin = stream_getc(BGP_INPUT(peer));
1129
1130 /* If the ORIGIN attribute has an undefined value, then the Error
1131 Subcode is set to Invalid Origin Attribute. The Data field
1132 contains the unrecognized attribute (type, length and value). */
1133 if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP)
1134 && (attr->origin != BGP_ORIGIN_INCOMPLETE)) {
af4c2728 1135 flog_err(BGP_ERR_ATTR_ORIGIN,
14454c9f 1136 "Origin attribute value is invalid %d", attr->origin);
d62a17ae 1137 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN,
1138 args->total);
1139 }
1140
1141 /* Set oring attribute flag. */
1142 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN);
1143
1144 return 0;
718e3744 1145}
ab005298
PJ		 1146
1147/* Parse AS path information. This function is wrapper of
1148 aspath_parse. */
d62a17ae 1149static int bgp_attr_aspath(struct bgp_attr_parser_args *args)
1150{
1151 struct attr *const attr = args->attr;
1152 struct peer *const peer = args->peer;
1153 const bgp_size_t length = args->length;
1154
1155 /*
1156 * peer with AS4 => will get 4Byte ASnums
1157 * otherwise, will get 16 Bit
1158 */
424ab01d 1159 attr->aspath = aspath_parse(peer->curr, length,
d62a17ae 1160 CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV));
1161
1162 /* In case of IBGP, length will be zero. */
1163 if (!attr->aspath) {
af4c2728 1164 flog_err(BGP_ERR_ATTR_MAL_AS_PATH,
14454c9f
DS		 1165 "Malformed AS path from %s, length is %d", peer->host,
1166 length);
d62a17ae 1167 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
1168 0);
1169 }
0b2aa3a0 1170
d62a17ae 1171 /* Set aspath attribute flag. */
1172 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH);
1173
1174 return BGP_ATTR_PARSE_PROCEED;
1175}
1176
1177static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer,
1178 struct attr *const attr)
1179{
1180 /* These checks were part of bgp_attr_aspath, but with
1181 * as4 we should to check aspath things when
1182 * aspath synthesizing with as4_path has already taken place.
1183 * Otherwise we check ASPATH and use the synthesized thing, and that is
1184 * not right.
1185 * So do the checks later, i.e. here
1186 */
d62a17ae 1187 struct aspath *aspath;
1188
1189 /* Confederation sanity check. */
1190 if ((peer->sort == BGP_PEER_CONFED
1191 && !aspath_left_confed_check(attr->aspath))
1192 || (peer->sort == BGP_PEER_EBGP
1193 && aspath_confed_check(attr->aspath))) {
af4c2728 1194 flog_err(BGP_ERR_ATTR_MAL_AS_PATH, "Malformed AS path from %s",
14454c9f 1195 peer->host);
d62a17ae 1196 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
1197 BGP_NOTIFY_UPDATE_MAL_AS_PATH);
1198 return BGP_ATTR_PARSE_ERROR;
1199 }
cddb8112 1200
d62a17ae 1201 /* First AS check for EBGP. */
47cbc09b 1202 if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) {
d62a17ae 1203 if (peer->sort == BGP_PEER_EBGP
1204 && !aspath_firstas_check(attr->aspath, peer->as)) {
af4c2728 1205 flog_err(BGP_ERR_ATTR_FIRST_AS,
14454c9f
DS		 1206 "%s incorrect first AS (must be %u)",
1207 peer->host, peer->as);
d62a17ae 1208 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
1209 BGP_NOTIFY_UPDATE_MAL_AS_PATH);
1210 return BGP_ATTR_PARSE_ERROR;
1211 }
1212 }
0b2aa3a0 1213
d62a17ae 1214 /* local-as prepend */
1215 if (peer->change_local_as
1216 && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) {
1217 aspath = aspath_dup(attr->aspath);
1218 aspath = aspath_add_seq(aspath, peer->change_local_as);
1219 aspath_unintern(&attr->aspath);
1220 attr->aspath = aspath_intern(aspath);
1221 }
0b2aa3a0 1222
d62a17ae 1223 return BGP_ATTR_PARSE_PROCEED;
0b2aa3a0
PJ		 1224}
1225
ab005298
PJ		 1226/* Parse AS4 path information. This function is another wrapper of
1227 aspath_parse. */
d62a17ae 1228static int bgp_attr_as4_path(struct bgp_attr_parser_args *args,
1229 struct aspath **as4_path)
ab005298 1230{
d62a17ae 1231 struct peer *const peer = args->peer;
1232 struct attr *const attr = args->attr;
1233 const bgp_size_t length = args->length;
ab005298 1234
424ab01d 1235 *as4_path = aspath_parse(peer->curr, length, 1);
b881c707 1236
d62a17ae 1237 /* In case of IBGP, length will be zero. */
1238 if (!*as4_path) {
af4c2728 1239 flog_err(BGP_ERR_ATTR_MAL_AS_PATH,
14454c9f
DS		 1240 "Malformed AS4 path from %s, length is %d",
1241 peer->host, length);
d62a17ae 1242 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
1243 0);
1244 }
ab005298 1245
d62a17ae 1246 /* Set aspath attribute flag. */
1247 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH);
1248
1249 return BGP_ATTR_PARSE_PROCEED;
0b2aa3a0
PJ		 1250}
1251
718e3744 1252/* Nexthop attribute. */
d62a17ae 1253static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args)
1254{
1255 struct peer *const peer = args->peer;
1256 struct attr *const attr = args->attr;
1257 const bgp_size_t length = args->length;
1258
1259 in_addr_t nexthop_h, nexthop_n;
1260
1261 /* Check nexthop attribute length. */
1262 if (length != 4) {
af4c2728 1263 flog_err(BGP_ERR_ATTR_LEN,
14454c9f 1264 "Nexthop attribute length isn't four [%d]", length);
d62a17ae 1265
1266 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1267 args->total);
1268 }
1269
1270 /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP
1271 attribute must result in a NOTIFICATION message (this is implemented
1272 below).
1273 At the same time, semantically incorrect NEXT_HOP is more likely to
1274 be just
1275 logged locally (this is implemented somewhere else). The UPDATE
1276 message
1277 gets ignored in any of these cases. */
424ab01d 1278 nexthop_n = stream_get_ipv4(peer->curr);
d62a17ae 1279 nexthop_h = ntohl(nexthop_n);
1280 if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h)
1281 || IPV4_CLASS_DE(nexthop_h))
1282 && !BGP_DEBUG(
1283 allow_martians,
1284 ALLOW_MARTIANS)) /* loopbacks may be used in testing */
1285 {
1286 char buf[INET_ADDRSTRLEN];
1287 inet_ntop(AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN);
af4c2728 1288 flog_err(BGP_ERR_ATTR_MARTIAN_NH, "Martian nexthop %s", buf);
d62a17ae 1289 return bgp_attr_malformed(
1290 args, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, args->total);
1291 }
1292
1293 attr->nexthop.s_addr = nexthop_n;
1294 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
1295
1296 return BGP_ATTR_PARSE_PROCEED;
718e3744 1297}
1298
1299/* MED atrribute. */
d62a17ae 1300static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args)
718e3744 1301{
d62a17ae 1302 struct peer *const peer = args->peer;
1303 struct attr *const attr = args->attr;
1304 const bgp_size_t length = args->length;
b881c707 1305
d62a17ae 1306 /* Length check. */
1307 if (length != 4) {
af4c2728 1308 flog_err(BGP_ERR_ATTR_LEN,
14454c9f 1309 "MED attribute length isn't four [%d]", length);
718e3744 1310
d62a17ae 1311 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1312 args->total);
1313 }
1314
424ab01d 1315 attr->med = stream_getl(peer->curr);
718e3744 1316
d62a17ae 1317 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC);
718e3744 1318
d62a17ae 1319 return BGP_ATTR_PARSE_PROCEED;
718e3744 1320}
1321
1322/* Local preference attribute. */
b881c707 1323static bgp_attr_parse_ret_t
d62a17ae 1324bgp_attr_local_pref(struct bgp_attr_parser_args *args)
1325{
1326 struct peer *const peer = args->peer;
1327 struct attr *const attr = args->attr;
1328 const bgp_size_t length = args->length;
1329
1330 /* Length check. */
1331 if (length != 4) {
af4c2728 1332 flog_err(BGP_ERR_ATTR_LEN,
14454c9f 1333 "LOCAL_PREF attribute length isn't 4 [%u]", length);
d62a17ae 1334 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1335 args->total);
1336 }
1337
1338 /* If it is contained in an UPDATE message that is received from an
1339 external peer, then this attribute MUST be ignored by the
1340 receiving speaker. */
1341 if (peer->sort == BGP_PEER_EBGP) {
424ab01d 1342 stream_forward_getp(peer->curr, length);
d62a17ae 1343 return BGP_ATTR_PARSE_PROCEED;
1344 }
1345
424ab01d 1346 attr->local_pref = stream_getl(peer->curr);
d62a17ae 1347
7f323236 1348 /* Set the local-pref flag. */
d62a17ae 1349 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF);
1350
1351 return BGP_ATTR_PARSE_PROCEED;
718e3744 1352}
1353
1354/* Atomic aggregate. */
d62a17ae 1355static int bgp_attr_atomic(struct bgp_attr_parser_args *args)
718e3744 1356{
d62a17ae 1357 struct attr *const attr = args->attr;
1358 const bgp_size_t length = args->length;
1359
1360 /* Length check. */
1361 if (length != 0) {
af4c2728 1362 flog_err(BGP_ERR_ATTR_LEN,
14454c9f
DS		 1363 "ATOMIC_AGGREGATE attribute length isn't 0 [%u]",
1364 length);
d62a17ae 1365 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1366 args->total);
1367 }
718e3744 1368
d62a17ae 1369 /* Set atomic aggregate flag. */
1370 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE);
718e3744 1371
d62a17ae 1372 return BGP_ATTR_PARSE_PROCEED;
718e3744 1373}
1374
1375/* Aggregator attribute */
d62a17ae 1376static int bgp_attr_aggregator(struct bgp_attr_parser_args *args)
1377{
1378 struct peer *const peer = args->peer;
1379 struct attr *const attr = args->attr;
1380 const bgp_size_t length = args->length;
1381
1382 int wantedlen = 6;
1383
1384 /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */
1385 if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV))
1386 wantedlen = 8;
1387
1388 if (length != wantedlen) {
af4c2728 1389 flog_err(BGP_ERR_ATTR_LEN,
14454c9f
DS		 1390 "AGGREGATOR attribute length isn't %u [%u]",
1391 wantedlen, length);
d62a17ae 1392 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1393 args->total);
1394 }
1395
1396 if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV))
424ab01d 1397 attr->aggregator_as = stream_getl(peer->curr);
d62a17ae 1398 else
424ab01d
QY		 1399 attr->aggregator_as = stream_getw(peer->curr);
1400 attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr);
d62a17ae 1401
1402 /* Set atomic aggregate flag. */
1403 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR);
1404
1405 return BGP_ATTR_PARSE_PROCEED;
718e3744 1406}
1407
0b2aa3a0 1408/* New Aggregator attribute */
b881c707 1409static bgp_attr_parse_ret_t
d62a17ae 1410bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args,
1411 as_t *as4_aggregator_as,
1412 struct in_addr *as4_aggregator_addr)
1413{
1414 struct peer *const peer = args->peer;
1415 struct attr *const attr = args->attr;
1416 const bgp_size_t length = args->length;
1417
1418 if (length != 8) {
af4c2728 1419 flog_err(BGP_ERR_ATTR_LEN,
14454c9f 1420 "New Aggregator length is not 8 [%d]", length);
d62a17ae 1421 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1422 0);
1423 }
1424
424ab01d
QY		 1425 *as4_aggregator_as = stream_getl(peer->curr);
1426 as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr);
d62a17ae 1427
1428 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR);
1429
1430 return BGP_ATTR_PARSE_PROCEED;
0b2aa3a0
PJ		 1431}
1432
1433/* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH.
1434 */
b881c707 1435static bgp_attr_parse_ret_t
d62a17ae 1436bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr,
1437 struct aspath *as4_path, as_t as4_aggregator,
1438 struct in_addr *as4_aggregator_addr)
1439{
1440 int ignore_as4_path = 0;
1441 struct aspath *newpath;
1442
1443 if (!attr->aspath) {
1444 /* NULL aspath shouldn't be possible as bgp_attr_parse should
1445 * have
1446 * checked that all well-known, mandatory attributes were
1447 * present.
1448 *
1449 * Can only be a problem with peer itself - hard error
1450 */
1451 return BGP_ATTR_PARSE_ERROR;
1452 }
1453
1454 if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) {
1455 /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR
1456 * if given.
1457 * It is worth a warning though, because the peer really
1458 * should not send them
1459 */
1460 if (BGP_DEBUG(as4, AS4)) {
1461 if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))
1462 zlog_debug("[AS4] %s %s AS4_PATH", peer->host,
1463 "AS4 capable peer, yet it sent");
1464
1465 if (attr->flag
1466 & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR)))
1467 zlog_debug("[AS4] %s %s AS4_AGGREGATOR",
1468 peer->host,
1469 "AS4 capable peer, yet it sent");
1470 }
1471
1472 return BGP_ATTR_PARSE_PROCEED;
1473 }
1474
1475 /* We have a asn16 peer. First, look for AS4_AGGREGATOR
1476 * because that may override AS4_PATH
1477 */
1478 if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) {
1479 if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) {
1480 /* received both.
1481 * if the as_number in aggregator is not AS_TRANS,
1482 * then AS4_AGGREGATOR and AS4_PATH shall be ignored
1483 * and the Aggregator shall be taken as
1484 * info on the aggregating node, and the AS_PATH
1485 * shall be taken as the AS_PATH
1486 * otherwise
1487 * the Aggregator shall be ignored and the
1488 * AS4_AGGREGATOR shall be taken as the
1489 * Aggregating node and the AS_PATH is to be
1490 * constructed "as in all other cases"
1491 */
1492 if (attr->aggregator_as != BGP_AS_TRANS) {
1493 /* ignore */
1494 if (BGP_DEBUG(as4, AS4))
1495 zlog_debug(
1496 "[AS4] %s BGP not AS4 capable peer"
1497 " send AGGREGATOR != AS_TRANS and"
1498 " AS4_AGGREGATOR, so ignore"
1499 " AS4_AGGREGATOR and AS4_PATH",
1500 peer->host);
1501 ignore_as4_path = 1;
1502 } else {
1503 /* "New_aggregator shall be taken as aggregator"
1504 */
1505 attr->aggregator_as = as4_aggregator;
1506 attr->aggregator_addr.s_addr =
1507 as4_aggregator_addr->s_addr;
1508 }
1509 } else {
1510 /* We received a AS4_AGGREGATOR but no AGGREGATOR.
1511 * That is bogus - but reading the conditions
1512 * we have to handle AS4_AGGREGATOR as if it were
1513 * AGGREGATOR in that case
1514 */
1515 if (BGP_DEBUG(as4, AS4))
1516 zlog_debug(
1517 "[AS4] %s BGP not AS4 capable peer send"
1518 " AS4_AGGREGATOR but no AGGREGATOR, will take"
1519 " it as if AGGREGATOR with AS_TRANS had been there",
1520 peer->host);
1521 attr->aggregator_as = as4_aggregator;
1522 /* sweep it under the carpet and simulate a "good"
1523 * AGGREGATOR */
1524 attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR));
1525 }
1526 }
1527
1528 /* need to reconcile NEW_AS_PATH and AS_PATH */
1529 if (!ignore_as4_path
1530 && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) {
1531 newpath = aspath_reconcile_as4(attr->aspath, as4_path);
e8a3a0a0 1532 if (!newpath)
1533 return BGP_ATTR_PARSE_ERROR;
1534
d62a17ae 1535 aspath_unintern(&attr->aspath);
1536 attr->aspath = aspath_intern(newpath);
1537 }
1538 return BGP_ATTR_PARSE_PROCEED;
0b2aa3a0
PJ		 1539}
1540
718e3744 1541/* Community attribute. */
b881c707 1542static bgp_attr_parse_ret_t
d62a17ae 1543bgp_attr_community(struct bgp_attr_parser_args *args)
1544{
1545 struct peer *const peer = args->peer;
1546 struct attr *const attr = args->attr;
1547 const bgp_size_t length = args->length;
1548
1549 if (length == 0) {
1550 attr->community = NULL;
1551 return BGP_ATTR_PARSE_PROCEED;
1552 }
1553
1554 attr->community =
d7c0a89a 1555 community_parse((uint32_t *)stream_pnt(peer->curr), length);
d62a17ae 1556
1557 /* XXX: fix community_parse to use stream API and remove this */
424ab01d 1558 stream_forward_getp(peer->curr, length);
d62a17ae 1559
1560 if (!attr->community)
1561 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
1562 args->total);
1563
1564 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES);
1565
1566 return BGP_ATTR_PARSE_PROCEED;
718e3744 1567}
1568
1569/* Originator ID attribute. */
b881c707 1570static bgp_attr_parse_ret_t
d62a17ae 1571bgp_attr_originator_id(struct bgp_attr_parser_args *args)
718e3744 1572{
d62a17ae 1573 struct peer *const peer = args->peer;
1574 struct attr *const attr = args->attr;
1575 const bgp_size_t length = args->length;
718e3744 1576
d62a17ae 1577 /* Length check. */
1578 if (length != 4) {
af4c2728 1579 flog_err(BGP_ERR_ATTR_LEN, "Bad originator ID length %d",
14454c9f 1580 length);
718e3744 1581
d62a17ae 1582 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1583 args->total);
1584 }
1585
424ab01d 1586 attr->originator_id.s_addr = stream_get_ipv4(peer->curr);
718e3744 1587
d62a17ae 1588 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID);
718e3744 1589
d62a17ae 1590 return BGP_ATTR_PARSE_PROCEED;
718e3744 1591}
1592
1593/* Cluster list attribute. */
b881c707 1594static bgp_attr_parse_ret_t
d62a17ae 1595bgp_attr_cluster_list(struct bgp_attr_parser_args *args)
718e3744 1596{
d62a17ae 1597 struct peer *const peer = args->peer;
1598 struct attr *const attr = args->attr;
1599 const bgp_size_t length = args->length;
1600
1601 /* Check length. */
1602 if (length % 4) {
af4c2728 1603 flog_err(BGP_ERR_ATTR_LEN, "Bad cluster list length %d",
14454c9f 1604 length);
718e3744 1605
d62a17ae 1606 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
1607 args->total);
1608 }
1609
1610 attr->cluster =
424ab01d 1611 cluster_parse((struct in_addr *)stream_pnt(peer->curr), length);
718e3744 1612
d62a17ae 1613 /* XXX: Fix cluster_parse to use stream API and then remove this */
424ab01d 1614 stream_forward_getp(peer->curr, length);
718e3744 1615
d62a17ae 1616 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST);
718e3744 1617
d62a17ae 1618 return BGP_ATTR_PARSE_PROCEED;
718e3744 1619}
1620
1621/* Multiprotocol reachability information parse. */
d62a17ae 1622int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
1623 struct bgp_nlri *mp_update)
1624{
1625 iana_afi_t pkt_afi;
1626 afi_t afi;
5c525538
RW		 1627 iana_safi_t pkt_safi;
1628 safi_t safi;
d62a17ae 1629 bgp_size_t nlri_len;
1630 size_t start;
1631 struct stream *s;
1632 struct peer *const peer = args->peer;
1633 struct attr *const attr = args->attr;
1634 const bgp_size_t length = args->length;
1635
1636 /* Set end of packet. */
1637 s = BGP_INPUT(peer);
1638 start = stream_get_getp(s);
1639
1640/* safe to read statically sized header? */
6e4ab12f 1641#define BGP_MP_REACH_MIN_SIZE 5
03292809 1642#define LEN_LEFT (length - (stream_get_getp(s) - start))
d62a17ae 1643 if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) {
1644 zlog_info("%s: %s sent invalid length, %lu", __func__,
1645 peer->host, (unsigned long)length);
1646 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1647 }
1648
1649 /* Load AFI, SAFI. */
1650 pkt_afi = stream_getw(s);
1651 pkt_safi = stream_getc(s);
1652
1653 /* Convert AFI, SAFI to internal values, check. */
1654 if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
1655 /* Log if AFI or SAFI is unrecognized. This is not an error
1656 * unless
1657 * the attribute is otherwise malformed.
1658 */
1659 if (bgp_debug_update(peer, NULL, NULL, 0))
1660 zlog_debug(
1661 "%s: MP_REACH received AFI %u or SAFI %u is unrecognized",
1662 peer->host, pkt_afi, pkt_safi);
1663 return BGP_ATTR_PARSE_ERROR;
1664 }
1665
1666 /* Get nexthop length. */
1667 attr->mp_nexthop_len = stream_getc(s);
1668
1669 if (LEN_LEFT < attr->mp_nexthop_len) {
1670 zlog_info(
1671 "%s: %s, MP nexthop length, %u, goes past end of attribute",
1672 __func__, peer->host, attr->mp_nexthop_len);
1673 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1674 }
1675
1676 /* Nexthop length check. */
1677 switch (attr->mp_nexthop_len) {
7c40bf39 1678 case 0:
1679 if (safi != SAFI_FLOWSPEC) {
1680 zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d",
1681 __func__, peer->host, attr->mp_nexthop_len);
1682 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1683 }
1684 break;
b6453163
LB		 1685 case BGP_ATTR_NHLEN_VPNV4:
1686 stream_getl(s); /* RD high */
1687 stream_getl(s); /* RD low */
996c9314
LB		 1688 /*
1689 * NOTE: intentional fall through
1690 * - for consistency in rx processing
1691 *
1692 * The following comment is to signal GCC this intention
1693 * and supress the warning
1694 */
1695 /* FALLTHRU */
d62a17ae 1696 case BGP_ATTR_NHLEN_IPV4:
1697 stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN);
1698 /* Probably needed for RFC 2283 */
1699 if (attr->nexthop.s_addr == 0)
1700 memcpy(&attr->nexthop.s_addr,
1701 &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN);
1702 break;
d62a17ae 1703 case BGP_ATTR_NHLEN_IPV6_GLOBAL:
1704 case BGP_ATTR_NHLEN_VPNV6_GLOBAL:
1705 if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) {
1706 stream_getl(s); /* RD high */
1707 stream_getl(s); /* RD low */
1708 }
1709 stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN);
77e62f2b 1710 if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global))
1711 attr->nh_ifindex = peer->nexthop.ifp->ifindex;
d62a17ae 1712 break;
1713 case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL:
1714 case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL:
1715 if (attr->mp_nexthop_len
1716 == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
1717 stream_getl(s); /* RD high */
1718 stream_getl(s); /* RD low */
1719 }
1720 stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN);
77e62f2b 1721 if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global))
1722 attr->nh_ifindex = peer->nexthop.ifp->ifindex;
d62a17ae 1723 if (attr->mp_nexthop_len
1724 == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
1725 stream_getl(s); /* RD high */
1726 stream_getl(s); /* RD low */
1727 }
1728 stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN);
1729 if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) {
1730 char buf1[INET6_ADDRSTRLEN];
1731 char buf2[INET6_ADDRSTRLEN];
1732
1733 if (bgp_debug_update(peer, NULL, NULL, 1))
1734 zlog_debug(
1735 "%s rcvd nexthops %s, %s -- ignoring non-LL value",
1736 peer->host,
1737 inet_ntop(AF_INET6,
1738 &attr->mp_nexthop_global,
1739 buf1, INET6_ADDRSTRLEN),
1740 inet_ntop(AF_INET6,
1741 &attr->mp_nexthop_local, buf2,
1742 INET6_ADDRSTRLEN));
1743
1744 attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
1745 }
77e62f2b 1746 attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex;
d62a17ae 1747 break;
1748 default:
1749 zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d",
1750 __func__, peer->host, attr->mp_nexthop_len);
1751 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1752 }
1753
1754 if (!LEN_LEFT) {
1755 zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__,
1756 peer->host);
1757 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1758 }
1759
718e3744 1760 {
d7c0a89a 1761 uint8_t val;
d62a17ae 1762 if ((val = stream_getc(s)))
1763 zlog_warn(
1764 "%s sent non-zero value, %u, for defunct SNPA-length field",
1765 peer->host, val);
1766 }
1767
1768 /* must have nrli_len, what is left of the attribute */
1769 nlri_len = LEN_LEFT;
9b9df989 1770 if (nlri_len > STREAM_READABLE(s)) {
d62a17ae 1771 zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host);
1772 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1773 }
1774
9b9df989
DS		 1775 if (!nlri_len) {
1776 zlog_info("%s: (%s) No Reachability, Treating as a EOR marker",
1777 __func__, peer->host);
1778
1779 mp_update->afi = afi;
1780 mp_update->safi = safi;
1781 return BGP_ATTR_PARSE_EOR;
1782 }
1783
d62a17ae 1784 mp_update->afi = afi;
1785 mp_update->safi = safi;
1786 mp_update->nlri = stream_pnt(s);
1787 mp_update->length = nlri_len;
1788
1789 stream_forward_getp(s, nlri_len);
1790
1791 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI);
1792
1793 return BGP_ATTR_PARSE_PROCEED;
03292809 1794#undef LEN_LEFT
718e3744 1795}
1796
1797/* Multiprotocol unreachable parse */
d62a17ae 1798int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args,
1799 struct bgp_nlri *mp_withdraw)
1800{
1801 struct stream *s;
1802 iana_afi_t pkt_afi;
1803 afi_t afi;
5c525538
RW		 1804 iana_safi_t pkt_safi;
1805 safi_t safi;
d7c0a89a 1806 uint16_t withdraw_len;
d62a17ae 1807 struct peer *const peer = args->peer;
1808 struct attr *const attr = args->attr;
1809 const bgp_size_t length = args->length;
9cabb64b 1810
424ab01d 1811 s = peer->curr;
9cabb64b 1812
d62a17ae 1813#define BGP_MP_UNREACH_MIN_SIZE 3
1814 if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE))
1815 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
1816
1817 pkt_afi = stream_getw(s);
1818 pkt_safi = stream_getc(s);
1819
1820 /* Convert AFI, SAFI to internal values, check. */
1821 if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
1822 /* Log if AFI or SAFI is unrecognized. This is not an error
1823 * unless
1824 * the attribute is otherwise malformed.
1825 */
1826 if (bgp_debug_update(peer, NULL, NULL, 0))
1827 zlog_debug(
1828 "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized",
1829 peer->host, pkt_afi, pkt_safi);
1830 return BGP_ATTR_PARSE_ERROR;
1831 }
718e3744 1832
d62a17ae 1833 withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE;
718e3744 1834
d62a17ae 1835 mp_withdraw->afi = afi;
1836 mp_withdraw->safi = safi;
1837 mp_withdraw->nlri = stream_pnt(s);
1838 mp_withdraw->length = withdraw_len;
718e3744 1839
d62a17ae 1840 stream_forward_getp(s, withdraw_len);
37da8fa9 1841
d62a17ae 1842 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI);
1843
1844 return BGP_ATTR_PARSE_PROCEED;
718e3744 1845}
1846
57d187bc
JS		 1847/* Large Community attribute. */
1848static bgp_attr_parse_ret_t
d62a17ae 1849bgp_attr_large_community(struct bgp_attr_parser_args *args)
1850{
1851 struct peer *const peer = args->peer;
1852 struct attr *const attr = args->attr;
1853 const bgp_size_t length = args->length;
1854
1855 /*
1856 * Large community follows new attribute format.
1857 */
1858 if (length == 0) {
1859 attr->lcommunity = NULL;
1860 /* Empty extcomm doesn't seem to be invalid per se */
1861 return BGP_ATTR_PARSE_PROCEED;
1862 }
57d187bc 1863
d62a17ae 1864 attr->lcommunity =
d7c0a89a 1865 lcommunity_parse((uint8_t *)stream_pnt(peer->curr), length);
d62a17ae 1866 /* XXX: fix ecommunity_parse to use stream API */
424ab01d 1867 stream_forward_getp(peer->curr, length);
57d187bc 1868
d62a17ae 1869 if (!attr->lcommunity)
1870 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
1871 args->total);
57d187bc 1872
d62a17ae 1873 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES);
57d187bc 1874
d62a17ae 1875 return BGP_ATTR_PARSE_PROCEED;
57d187bc
JS		 1876}
1877
718e3744 1878/* Extended Community attribute. */
b881c707 1879static bgp_attr_parse_ret_t
d62a17ae 1880bgp_attr_ext_communities(struct bgp_attr_parser_args *args)
1881{
1882 struct peer *const peer = args->peer;
1883 struct attr *const attr = args->attr;
1884 const bgp_size_t length = args->length;
d7c0a89a 1885 uint8_t sticky = 0;
d62a17ae 1886
1887 if (length == 0) {
1888 attr->ecommunity = NULL;
1889 /* Empty extcomm doesn't seem to be invalid per se */
1890 return BGP_ATTR_PARSE_PROCEED;
1891 }
1892
1893 attr->ecommunity =
d7c0a89a 1894 ecommunity_parse((uint8_t *)stream_pnt(peer->curr), length);
d62a17ae 1895 /* XXX: fix ecommunity_parse to use stream API */
424ab01d 1896 stream_forward_getp(peer->curr, length);
d62a17ae 1897
1898 if (!attr->ecommunity)
1899 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
1900 args->total);
1901
1902 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
1903
1904 /* Extract MAC mobility sequence number, if any. */
1905 attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky);
1906 attr->sticky = sticky;
1907
ead40654
MK		 1908 /* Check if this is a Gateway MAC-IP advertisement */
1909 attr->default_gw = bgp_attr_default_gw(attr);
1910
68e33151
CS		 1911 /* Handle scenario where router flag ecommunity is not
1912 * set but default gw ext community is present.
1913 * Use default gateway, set and propogate R-bit.
1914 */
1915 if (attr->default_gw)
1916 attr->router_flag = 1;
1917
1918 /* Check EVPN Neighbor advertisement flags, R-bit */
1919 bgp_attr_evpn_na_flag(attr, &attr->router_flag);
1920
bc59a672
MK		 1921 /* Extract the Rmac, if any */
1922 bgp_attr_rmac(attr, &attr->rmac);
1923
d62a17ae 1924 return BGP_ATTR_PARSE_PROCEED;
718e3744 1925}
1926
f4c89855 1927/* Parse Tunnel Encap attribute in an UPDATE */
d62a17ae 1928static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
1929 bgp_size_t length, /* IN: attr's length field */
1930 struct attr *attr, /* IN: caller already allocated */
d7c0a89a
QY		 1931 uint8_t flag, /* IN: attr's flags field */
1932 uint8_t *startp)
d62a17ae 1933{
1934 bgp_size_t total;
d62a17ae 1935 uint16_t tunneltype = 0;
1936
1937 total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
1938
1939 if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)
1940 || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) {
1941 zlog_info(
1942 "Tunnel Encap attribute flag isn't optional and transitive %d",
1943 flag);
1944 bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
1945 BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
1946 startp, total);
1947 return -1;
1948 }
1949
1950 if (BGP_ATTR_ENCAP == type) {
1951 /* read outer TLV type and length */
1952 uint16_t tlv_length;
1953
1954 if (length < 4) {
1955 zlog_info(
1956 "Tunnel Encap attribute not long enough to contain outer T,L");
1957 bgp_notify_send_with_data(
1958 peer, BGP_NOTIFY_UPDATE_ERR,
1959 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
1960 return -1;
1961 }
1962 tunneltype = stream_getw(BGP_INPUT(peer));
1963 tlv_length = stream_getw(BGP_INPUT(peer));
1964 length -= 4;
1965
1966 if (tlv_length != length) {
1967 zlog_info("%s: tlv_length(%d) != length(%d)", __func__,
1968 tlv_length, length);
1969 }
1970 }
1971
1972 while (length >= 4) {
1973 uint16_t subtype = 0;
1974 uint16_t sublength = 0;
1975 struct bgp_attr_encap_subtlv *tlv;
1976
1977 if (BGP_ATTR_ENCAP == type) {
1978 subtype = stream_getc(BGP_INPUT(peer));
1979 sublength = stream_getc(BGP_INPUT(peer));
1980 length -= 2;
65efcfce 1981#if ENABLE_BGP_VNC
d62a17ae 1982 } else {
1983 subtype = stream_getw(BGP_INPUT(peer));
1984 sublength = stream_getw(BGP_INPUT(peer));
1985 length -= 4;
65efcfce 1986#endif
d62a17ae 1987 }
1988
1989 if (sublength > length) {
1990 zlog_info(
1991 "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
1992 sublength, length);
1993 bgp_notify_send_with_data(
1994 peer, BGP_NOTIFY_UPDATE_ERR,
1995 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
1996 return -1;
1997 }
1998
1999 /* alloc and copy sub-tlv */
2000 /* TBD make sure these are freed when attributes are released */
2001 tlv = XCALLOC(MTYPE_ENCAP_TLV,
996c9314 2002 sizeof(struct bgp_attr_encap_subtlv) + sublength);
d62a17ae 2003 tlv->type = subtype;
2004 tlv->length = sublength;
424ab01d 2005 stream_get(tlv->value, peer->curr, sublength);
d62a17ae 2006 length -= sublength;
2007
2008 /* attach tlv to encap chain */
2009 if (BGP_ATTR_ENCAP == type) {
e4002056 2010 struct bgp_attr_encap_subtlv *stlv_last;
d62a17ae 2011 for (stlv_last = attr->encap_subtlvs;
2012 stlv_last && stlv_last->next;
2013 stlv_last = stlv_last->next)
2014 ;
2015 if (stlv_last) {
2016 stlv_last->next = tlv;
2017 } else {
2018 attr->encap_subtlvs = tlv;
2019 }
65efcfce 2020#if ENABLE_BGP_VNC
d62a17ae 2021 } else {
e4002056 2022 struct bgp_attr_encap_subtlv *stlv_last;
d62a17ae 2023 for (stlv_last = attr->vnc_subtlvs;
2024 stlv_last && stlv_last->next;
2025 stlv_last = stlv_last->next)
2026 ;
2027 if (stlv_last) {
2028 stlv_last->next = tlv;
2029 } else {
2030 attr->vnc_subtlvs = tlv;
2031 }
aadc0905 2032#endif
d62a17ae 2033 }
d62a17ae 2034 }
f4c89855 2035
d62a17ae 2036 if (BGP_ATTR_ENCAP == type) {
2037 attr->encap_tunneltype = tunneltype;
2038 }
f4c89855 2039
d62a17ae 2040 if (length) {
2041 /* spurious leftover data */
2042 zlog_info(
2043 "Tunnel Encap attribute length is bad: %d leftover octets",
2044 length);
2045 bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
2046 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
2047 startp, total);
2048 return -1;
2049 }
f4c89855 2050
d62a17ae 2051 return 0;
f4c89855
LB		 2052}
2053
30adbd4e
DS		 2054/*
2055 * Read an individual SID value returning how much data we have read
2056 * Returns 0 if there was an error that needs to be passed up the stack
c5a543b4 2057 */
30adbd4e
DS		 2058static bgp_attr_parse_ret_t bgp_attr_psid_sub(int32_t type,
2059 int32_t length,
2060 struct bgp_attr_parser_args *args,
2061 struct bgp_nlri *mp_update)
d62a17ae 2062{
2063 struct peer *const peer = args->peer;
2064 struct attr *const attr = args->attr;
d7c0a89a 2065 uint32_t label_index;
d62a17ae 2066 struct in6_addr ipv6_sid;
d7c0a89a
QY		 2067 uint32_t srgb_base;
2068 uint32_t srgb_range;
d62a17ae 2069 int srgb_count;
2070
d62a17ae 2071 if (type == BGP_PREFIX_SID_LABEL_INDEX) {
2072 if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) {
af4c2728 2073 flog_err(
14454c9f
DS		 2074 BGP_ERR_ATTR_LEN,
2075 "Prefix SID label index length is %d instead of %d",
2076 length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
30adbd4e
DS		 2077 return bgp_attr_malformed(args,
2078 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
2079 args->total);
d62a17ae 2080 }
2081
2082 /* Ignore flags and reserved */
424ab01d
QY		 2083 stream_getc(peer->curr);
2084 stream_getw(peer->curr);
d62a17ae 2085
2086 /* Fetch the label index and see if it is valid. */
424ab01d 2087 label_index = stream_getl(peer->curr);
d62a17ae 2088 if (label_index == BGP_INVALID_LABEL_INDEX)
30adbd4e
DS		 2089 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
2090 args->total);
d62a17ae 2091
2092 /* Store label index; subsequently, we'll check on
2093 * address-family */
2094 attr->label_index = label_index;
2095
2096 /*
2097 * Ignore the Label index attribute unless received for
2098 * labeled-unicast
2099 * SAFI.
2100 */
2101 if (!mp_update->length
2102 || mp_update->safi != SAFI_LABELED_UNICAST)
2103 attr->label_index = BGP_INVALID_LABEL_INDEX;
2104 }
2105
2106 /* Placeholder code for the IPv6 SID type */
2107 else if (type == BGP_PREFIX_SID_IPV6) {
2108 if (length != BGP_PREFIX_SID_IPV6_LENGTH) {
af4c2728 2109 flog_err(BGP_ERR_ATTR_LEN,
14454c9f
DS		 2110 "Prefix SID IPv6 length is %d instead of %d",
2111 length, BGP_PREFIX_SID_IPV6_LENGTH);
30adbd4e
DS		 2112 return bgp_attr_malformed(args,
2113 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
2114 args->total);
d62a17ae 2115 }
2116
2117 /* Ignore reserved */
424ab01d
QY		 2118 stream_getc(peer->curr);
2119 stream_getw(peer->curr);
d62a17ae 2120
424ab01d 2121 stream_get(&ipv6_sid, peer->curr, 16);
d62a17ae 2122 }
2123
2124 /* Placeholder code for the Originator SRGB type */
2125 else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) {
2126 /* Ignore flags */
424ab01d 2127 stream_getw(peer->curr);
d62a17ae 2128
2129 length -= 2;
2130
2131 if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) {
af4c2728 2132 flog_err(
14454c9f 2133 BGP_ERR_ATTR_LEN,
d62a17ae 2134 "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ",
2135 length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH);
2136 return bgp_attr_malformed(
2137 args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
2138 args->total);
2139 }
2140
2141 srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH;
2142
2143 for (int i = 0; i < srgb_count; i++) {
424ab01d
QY		 2144 stream_get(&srgb_base, peer->curr, 3);
2145 stream_get(&srgb_range, peer->curr, 3);
d62a17ae 2146 }
2147 }
2148
2149 return BGP_ATTR_PARSE_PROCEED;
6cf48acc
VV		 2150}
2151
30adbd4e
DS		 2152/* Prefix SID attribute
2153 * draft-ietf-idr-bgp-prefix-sid-05
2154 */
2155bgp_attr_parse_ret_t
2156bgp_attr_prefix_sid(int32_t tlength, struct bgp_attr_parser_args *args,
2157 struct bgp_nlri *mp_update)
2158{
2159 struct peer *const peer = args->peer;
2160 struct attr *const attr = args->attr;
2161 bgp_attr_parse_ret_t ret;
2162
2163 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID);
2164
2165 while (tlength) {
2166 int32_t type, length;
2167
2168 type = stream_getc(peer->curr);
2169 length = stream_getw(peer->curr);
2170
2171 ret = bgp_attr_psid_sub(type, length, args, mp_update);
2172
2173 if (ret != BGP_ATTR_PARSE_PROCEED)
2174 return ret;
2175 /*
2176 * Subtract length + the T and the L
2177 * since length is the Vector portion
2178 */
2179 tlength -= length + 3;
2180
2181 if (tlength < 0) {
af4c2728 2182 flog_err(
14454c9f
DS		 2183 BGP_ERR_ATTR_LEN,
2184 "Prefix SID internal length %d causes us to read beyond the total Prefix SID length",
2185 length);
30adbd4e
DS		 2186 return bgp_attr_malformed(args,
2187 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
2188 args->total);
2189 }
2190 }
2191
2192 return BGP_ATTR_PARSE_PROCEED;
2193}
2194
7fd077aa 2195/* PMSI tunnel attribute (RFC 6514)
2196 * Basic validation checks done here.
2197 */
2198static bgp_attr_parse_ret_t
2199bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args)
2200{
2201 struct peer *const peer = args->peer;
2202 struct attr *const attr = args->attr;
2203 const bgp_size_t length = args->length;
d7c0a89a 2204 uint8_t tnl_type;
7fd077aa 2205
2206 /* Verify that the receiver is expecting "ingress replication" as we
2207 * can only support that.
2208 */
2209 if (length < 2) {
af4c2728 2210 flog_err(BGP_ERR_ATTR_LEN,
14454c9f 2211 "Bad PMSI tunnel attribute length %d", length);
7fd077aa 2212 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
2213 args->total);
2214 }
2215 stream_getc(peer->curr); /* Flags */
2216 tnl_type = stream_getc(peer->curr);
2217 if (tnl_type > PMSI_TNLTYPE_MAX) {
af4c2728 2218 flog_err(BGP_ERR_ATTR_PMSI_TYPE,
14454c9f 2219 "Invalid PMSI tunnel attribute type %d", tnl_type);
7fd077aa 2220 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
2221 args->total);
2222 }
2223 if (tnl_type == PMSI_TNLTYPE_INGR_REPL) {
2224 if (length != 9) {
af4c2728 2225 flog_err(BGP_ERR_ATTR_PMSI_LEN,
14454c9f
DS		 2226 "Bad PMSI tunnel attribute length %d for IR",
2227 length);
052ea98b 2228 return bgp_attr_malformed(
2229 args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
2230 args->total);
7fd077aa 2231 }
2232 }
2233
2234 attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL);
2235 attr->pmsi_tnl_type = tnl_type;
2236
2237 /* Forward read pointer of input stream. */
2238 stream_forward_getp(peer->curr, length - 2);
2239
2240 return BGP_ATTR_PARSE_PROCEED;
2241}
2242
718e3744 2243/* BGP unknown attribute treatment. */
d62a17ae 2244static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args)
2245{
2246 bgp_size_t total = args->total;
2247 struct transit *transit;
2248 struct peer *const peer = args->peer;
2249 struct attr *const attr = args->attr;
d7c0a89a
QY		 2250 uint8_t *const startp = args->startp;
2251 const uint8_t type = args->type;
2252 const uint8_t flag = args->flags;
d62a17ae 2253 const bgp_size_t length = args->length;
2254
2255 if (bgp_debug_update(peer, NULL, NULL, 1))
2256 zlog_debug(
2257 "%s Unknown attribute is received (type %d, length %d)",
2258 peer->host, type, length);
2259
2260 /* Forward read pointer of input stream. */
424ab01d 2261 stream_forward_getp(peer->curr, length);
d62a17ae 2262
2263 /* If any of the mandatory well-known attributes are not recognized,
2264 then the Error Subcode is set to Unrecognized Well-known
2265 Attribute. The Data field contains the unrecognized attribute
2266 (type, length and value). */
2267 if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) {
2268 return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR,
2269 args->total);
2270 }
2271
2272 /* Unrecognized non-transitive optional attributes must be quietly
2273 ignored and not passed along to other BGP peers. */
2274 if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS))
2275 return BGP_ATTR_PARSE_PROCEED;
2276
2277 /* If a path with recognized transitive optional attribute is
2278 accepted and passed along to other BGP peers and the Partial bit
2279 in the Attribute Flags octet is set to 1 by some previous AS, it
2280 is not set back to 0 by the current AS. */
2281 SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL);
2282
2283 /* Store transitive attribute to the end of attr->transit. */
2284 if (!attr->transit)
2285 attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit));
2286
2287 transit = attr->transit;
2288
2289 if (transit->val)
2290 transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val,
2291 transit->length + total);
2292 else
2293 transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total);
2294
2295 memcpy(transit->val + transit->length, startp, total);
2296 transit->length += total;
2297
2298 return BGP_ATTR_PARSE_PROCEED;
718e3744 2299}
2300
bb7bef14 2301/* Well-known attribute check. */
d62a17ae 2302static int bgp_attr_check(struct peer *peer, struct attr *attr)
2303{
d7c0a89a 2304 uint8_t type = 0;
d62a17ae 2305
2306 /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an
2307 * empty UPDATE. */
2308 if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag)
2309 return BGP_ATTR_PARSE_PROCEED;
2310
2311 /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required
2312 to carry any other path attributes.", though if MP_REACH_NLRI or NLRI
2313 are present, it should. Check for any other attribute being present
2314 instead.
2315 */
404c82d5
PG		 2316 if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) &&
2317 CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI))))
d62a17ae 2318 return BGP_ATTR_PARSE_PROCEED;
2319
2320 if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN)))
2321 type = BGP_ATTR_ORIGIN;
2322
2323 if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)))
2324 type = BGP_ATTR_AS_PATH;
2325
2326 /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present
2327 * and
2328 * NLRI is empty. We can't easily check NLRI empty here though.
2329 */
2330 if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP))
2331 && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)))
2332 type = BGP_ATTR_NEXT_HOP;
2333
2334 if (peer->sort == BGP_PEER_IBGP
2335 && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)))
2336 type = BGP_ATTR_LOCAL_PREF;
2337
2338 if (type) {
2339 zlog_warn("%s Missing well-known attribute %s.", peer->host,
2340 lookup_msg(attr_str, type, NULL));
2341 bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
2342 BGP_NOTIFY_UPDATE_MISS_ATTR, &type,
2343 1);
2344 return BGP_ATTR_PARSE_ERROR;
2345 }
2346 return BGP_ATTR_PARSE_PROCEED;
bb7bef14
PJ		 2347}
2348
718e3744 2349/* Read attribute of update packet. This function is called from
8b366b9c 2350 bgp_update_receive() in bgp_packet.c. */
d62a17ae 2351bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr,
2352 bgp_size_t size, struct bgp_nlri *mp_update,
2353 struct bgp_nlri *mp_withdraw)
2354{
2355 int ret;
d7c0a89a
QY		 2356 uint8_t flag = 0;
2357 uint8_t type = 0;
d62a17ae 2358 bgp_size_t length;
d7c0a89a
QY		 2359 uint8_t *startp, *endp;
2360 uint8_t *attr_endp;
2361 uint8_t seen[BGP_ATTR_BITMAP_SIZE];
d62a17ae 2362 /* we need the as4_path only until we have synthesized the as_path with
2363 * it */
2364 /* same goes for as4_aggregator */
2365 struct aspath *as4_path = NULL;
2366 as_t as4_aggregator = 0;
2367 struct in_addr as4_aggregator_addr = {.s_addr = 0};
2368
2369 /* Initialize bitmap. */
2370 memset(seen, 0, BGP_ATTR_BITMAP_SIZE);
2371
2372 /* End pointer of BGP attribute. */
2373 endp = BGP_INPUT_PNT(peer) + size;
2374
2375 /* Get attributes to the end of attribute length. */
2376 while (BGP_INPUT_PNT(peer) < endp) {
2377 /* Check remaining length check.*/
2378 if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) {
2379 /* XXX warning: long int format, int arg (arg 5) */
2380 zlog_warn(
2381 "%s: error BGP attribute length %lu is smaller than min len",
2382 peer->host,
2383 (unsigned long)(endp
2d34fb80 2384 - stream_pnt(BGP_INPUT(peer))));
d62a17ae 2385
2386 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2387 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
2388 return BGP_ATTR_PARSE_ERROR;
2389 }
718e3744 2390
d62a17ae 2391 /* Fetch attribute flag and type. */
2392 startp = BGP_INPUT_PNT(peer);
2393 /* "The lower-order four bits of the Attribute Flags octet are
2394 unused. They MUST be zero when sent and MUST be ignored when
2395 received." */
2396 flag = 0xF0 & stream_getc(BGP_INPUT(peer));
2397 type = stream_getc(BGP_INPUT(peer));
2398
2399 /* Check whether Extended-Length applies and is in bounds */
2400 if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)
2401 && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) {
2402 zlog_warn(
2403 "%s: Extended length set, but just %lu bytes of attr header",
2404 peer->host,
2405 (unsigned long)(endp
2d34fb80 2406 - stream_pnt(BGP_INPUT(peer))));
d62a17ae 2407
2408 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2409 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
2410 return BGP_ATTR_PARSE_ERROR;
2411 }
718e3744 2412
d62a17ae 2413 /* Check extended attribue length bit. */
2414 if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN))
2415 length = stream_getw(BGP_INPUT(peer));
2416 else
2417 length = stream_getc(BGP_INPUT(peer));
718e3744 2418
d62a17ae 2419 /* If any attribute appears more than once in the UPDATE
2420 message, then the Error Subcode is set to Malformed Attribute
2421 List. */
718e3744 2422
d62a17ae 2423 if (CHECK_BITMAP(seen, type)) {
2424 zlog_warn(
2425 "%s: error BGP attribute type %d appears twice in a message",
2426 peer->host, type);
718e3744 2427
d62a17ae 2428 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2429 BGP_NOTIFY_UPDATE_MAL_ATTR);
2430 return BGP_ATTR_PARSE_ERROR;
2431 }
2432
2433 /* Set type to bitmap to check duplicate attribute. `type' is
2434 unsigned char so it never overflow bitmap range. */
2435
2436 SET_BITMAP(seen, type);
2437
2438 /* Overflow check. */
2439 attr_endp = BGP_INPUT_PNT(peer) + length;
2440
2441 if (attr_endp > endp) {
2442 zlog_warn(
2443 "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p",
2444 peer->host, type, length, size, attr_endp,
2445 endp);
dacffad4
QY		 2446 /*
2447 * RFC 4271 6.3
2448 * If any recognized attribute has an Attribute
2449 * Length that conflicts with the expected length
2450 * (based on the attribute type code), then the
2451 * Error Subcode MUST be set to Attribute Length
2452 * Error. The Data field MUST contain the erroneous
2453 * attribute (type, length, and value).
2454 * ----------
2455 * We do not currently have a good way to determine the
2456 * length of the attribute independent of the length
2457 * received in the message. Instead we send the
2458 * minimum between the amount of data we have and the
2459 * amount specified by the attribute length field.
2460 *
2461 * Instead of directly passing in the packet buffer and
2462 * offset we use the stream_get* functions to read into
2463 * a stack buffer, since they perform bounds checking
2464 * and we are working with untrusted data.
2465 */
2466 unsigned char ndata[BGP_MAX_PACKET_SIZE];
2467 memset(ndata, 0x00, sizeof(ndata));
2468 size_t lfl =
2469 CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1;
2470 /* Rewind to end of flag field */
2471 stream_forward_getp(BGP_INPUT(peer), -(1 + lfl));
2472 /* Type */
2473 stream_get(&ndata[0], BGP_INPUT(peer), 1);
2474 /* Length */
2475 stream_get(&ndata[1], BGP_INPUT(peer), lfl);
2476 /* Value */
2477 size_t atl = attr_endp - startp;
2478 size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer)));
2479 stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl);
2480
d62a17ae 2481 bgp_notify_send_with_data(
2482 peer, BGP_NOTIFY_UPDATE_ERR,
dacffad4
QY		 2483 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata,
2484 ndl + lfl + 1);
2485
d62a17ae 2486 return BGP_ATTR_PARSE_ERROR;
2487 }
2488
2489 struct bgp_attr_parser_args attr_args = {
2490 .peer = peer,
2491 .length = length,
2492 .attr = attr,
2493 .type = type,
2494 .flags = flag,
2495 .startp = startp,
2496 .total = attr_endp - startp,
2497 };
2498
2499
2500 /* If any recognized attribute has Attribute Flags that conflict
2501 with the Attribute Type Code, then the Error Subcode is set
2502 to
2503 Attribute Flags Error. The Data field contains the erroneous
2504 attribute (type, length and value). */
2505 if (bgp_attr_flag_invalid(&attr_args)) {
2506 bgp_attr_parse_ret_t ret;
2507 ret = bgp_attr_malformed(
2508 &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
2509 attr_args.total);
2510 if (ret == BGP_ATTR_PARSE_PROCEED)
2511 continue;
2512 return ret;
2513 }
2514
2515 /* OK check attribute and store it's value. */
2516 switch (type) {
2517 case BGP_ATTR_ORIGIN:
2518 ret = bgp_attr_origin(&attr_args);
2519 break;
2520 case BGP_ATTR_AS_PATH:
2521 ret = bgp_attr_aspath(&attr_args);
2522 break;
2523 case BGP_ATTR_AS4_PATH:
2524 ret = bgp_attr_as4_path(&attr_args, &as4_path);
2525 break;
2526 case BGP_ATTR_NEXT_HOP:
2527 ret = bgp_attr_nexthop(&attr_args);
2528 break;
2529 case BGP_ATTR_MULTI_EXIT_DISC:
2530 ret = bgp_attr_med(&attr_args);
2531 break;
2532 case BGP_ATTR_LOCAL_PREF:
2533 ret = bgp_attr_local_pref(&attr_args);
2534 break;
2535 case BGP_ATTR_ATOMIC_AGGREGATE:
2536 ret = bgp_attr_atomic(&attr_args);
2537 break;
2538 case BGP_ATTR_AGGREGATOR:
2539 ret = bgp_attr_aggregator(&attr_args);
2540 break;
2541 case BGP_ATTR_AS4_AGGREGATOR:
2542 ret = bgp_attr_as4_aggregator(&attr_args,
2543 &as4_aggregator,
2544 &as4_aggregator_addr);
2545 break;
2546 case BGP_ATTR_COMMUNITIES:
2547 ret = bgp_attr_community(&attr_args);
2548 break;
2549 case BGP_ATTR_LARGE_COMMUNITIES:
2550 ret = bgp_attr_large_community(&attr_args);
2551 break;
2552 case BGP_ATTR_ORIGINATOR_ID:
2553 ret = bgp_attr_originator_id(&attr_args);
2554 break;
2555 case BGP_ATTR_CLUSTER_LIST:
2556 ret = bgp_attr_cluster_list(&attr_args);
2557 break;
2558 case BGP_ATTR_MP_REACH_NLRI:
2559 ret = bgp_mp_reach_parse(&attr_args, mp_update);
2560 break;
2561 case BGP_ATTR_MP_UNREACH_NLRI:
2562 ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw);
2563 break;
2564 case BGP_ATTR_EXT_COMMUNITIES:
2565 ret = bgp_attr_ext_communities(&attr_args);
2566 break;
65efcfce 2567#if ENABLE_BGP_VNC
d62a17ae 2568 case BGP_ATTR_VNC:
65efcfce 2569#endif
d62a17ae 2570 case BGP_ATTR_ENCAP:
2571 ret = bgp_attr_encap(type, peer, length, attr, flag,
2572 startp);
2573 break;
2574 case BGP_ATTR_PREFIX_SID:
30adbd4e
DS		 2575 ret = bgp_attr_prefix_sid(length,
2576 &attr_args, mp_update);
d62a17ae 2577 break;
7fd077aa 2578 case BGP_ATTR_PMSI_TUNNEL:
2579 ret = bgp_attr_pmsi_tunnel(&attr_args);
2580 break;
d62a17ae 2581 default:
2582 ret = bgp_attr_unknown(&attr_args);
2583 break;
2584 }
2585
2586 if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) {
2587 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2588 BGP_NOTIFY_UPDATE_MAL_ATTR);
2589 ret = BGP_ATTR_PARSE_ERROR;
2590 }
2591
9b9df989
DS		 2592 if (ret == BGP_ATTR_PARSE_EOR) {
2593 if (as4_path)
2594 aspath_unintern(&as4_path);
2595 return ret;
2596 }
2597
d62a17ae 2598 /* If hard error occured immediately return to the caller. */
2599 if (ret == BGP_ATTR_PARSE_ERROR) {
2600 zlog_warn("%s: Attribute %s, parse error", peer->host,
2601 lookup_msg(attr_str, type, NULL));
2602 if (as4_path)
2603 aspath_unintern(&as4_path);
2604 return ret;
2605 }
2606 if (ret == BGP_ATTR_PARSE_WITHDRAW) {
2607
2608 zlog_warn(
2609 "%s: Attribute %s, parse error - treating as withdrawal",
2610 peer->host, lookup_msg(attr_str, type, NULL));
2611 if (as4_path)
2612 aspath_unintern(&as4_path);
2613 return ret;
2614 }
2615
2616 /* Check the fetched length. */
2617 if (BGP_INPUT_PNT(peer) != attr_endp) {
2618 zlog_warn("%s: BGP attribute %s, fetch error",
2619 peer->host, lookup_msg(attr_str, type, NULL));
2620 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2621 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
2622 if (as4_path)
2623 aspath_unintern(&as4_path);
2624 return BGP_ATTR_PARSE_ERROR;
2625 }
718e3744 2626 }
d62a17ae 2627
2628 /* Check final read pointer is same as end pointer. */
2629 if (BGP_INPUT_PNT(peer) != endp) {
2630 zlog_warn("%s: BGP attribute %s, length mismatch", peer->host,
2631 lookup_msg(attr_str, type, NULL));
2632 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2633 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
2634 if (as4_path)
2635 aspath_unintern(&as4_path);
2636 return BGP_ATTR_PARSE_ERROR;
2637 }
2638
2639 /* Check all mandatory well-known attributes are present */
718e3744 2640 {
d62a17ae 2641 bgp_attr_parse_ret_t ret;
2642 if ((ret = bgp_attr_check(peer, attr)) < 0) {
2643 if (as4_path)
2644 aspath_unintern(&as4_path);
2645 return ret;
2646 }
2647 }
2648
2649 /*
2650 * At this place we can see whether we got AS4_PATH and/or
2651 * AS4_AGGREGATOR from a 16Bit peer and act accordingly.
2652 * We can not do this before we've read all attributes because
2653 * the as4 handling does not say whether AS4_PATH has to be sent
2654 * after AS_PATH or not - and when AS4_AGGREGATOR will be send
2655 * in relationship to AGGREGATOR.
2656 * So, to be defensive, we are not relying on any order and read
2657 * all attributes first, including these 32bit ones, and now,
2658 * afterwards, we look what and if something is to be done for as4.
2659 *
2660 * It is possible to not have AS_PATH, e.g. GR EoR and sole
2661 * MP_UNREACH_NLRI.
2662 */
2663 /* actually... this doesn't ever return failure currently, but
2664 * better safe than sorry */
2665 if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))
2666 && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator,
2667 &as4_aggregator_addr)) {
2668 bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
2669 BGP_NOTIFY_UPDATE_MAL_ATTR);
2670 if (as4_path)
2671 aspath_unintern(&as4_path);
2672 return BGP_ATTR_PARSE_ERROR;
2673 }
2674
2675 /* At this stage, we have done all fiddling with as4, and the
2676 * resulting info is in attr->aggregator resp. attr->aspath
2677 * so we can chuck as4_aggregator and as4_path alltogether in
2678 * order to save memory
2679 */
2680 if (as4_path) {
2681 aspath_unintern(&as4_path); /* unintern - it is in the hash */
2682 /* The flag that we got this is still there, but that does not
2683 * do any trouble
2684 */
2685 }
2686 /*
2687 * The "rest" of the code does nothing with as4_aggregator.
2688 * there is no memory attached specifically which is not part
2689 * of the attr.
2690 * so ignoring just means do nothing.
2691 */
2692 /*
2693 * Finally do the checks on the aspath we did not do yet
2694 * because we waited for a potentially synthesized aspath.
2695 */
2696 if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) {
2697 ret = bgp_attr_aspath_check(peer, attr);
2698 if (ret != BGP_ATTR_PARSE_PROCEED)
2699 return ret;
2700 }
2701 /* Finally intern unknown attribute. */
2702 if (attr->transit)
2703 attr->transit = transit_intern(attr->transit);
2704 if (attr->encap_subtlvs)
2705 attr->encap_subtlvs =
2706 encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE);
bede7744 2707#if ENABLE_BGP_VNC
d62a17ae 2708 if (attr->vnc_subtlvs)
2709 attr->vnc_subtlvs =
2710 encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE);
bede7744 2711#endif
718e3744 2712
d62a17ae 2713 return BGP_ATTR_PARSE_PROCEED;
2714}
2715
2716size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi,
2717 safi_t safi, struct bpacket_attr_vec_arr *vecarr,
2718 struct attr *attr)
2719{
2720 size_t sizep;
2721 iana_afi_t pkt_afi;
5c525538 2722 iana_safi_t pkt_safi;
d62a17ae 2723 afi_t nh_afi;
2724
2725 /* Set extended bit always to encode the attribute length as 2 bytes */
2726 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN);
2727 stream_putc(s, BGP_ATTR_MP_REACH_NLRI);
2728 sizep = stream_get_endp(s);
2729 stream_putw(s, 0); /* Marker: Attribute length. */
2730
2731
2732 /* Convert AFI, SAFI to values for packet. */
2733 bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi);
2734
2735 stream_putw(s, pkt_afi); /* AFI */
2736 stream_putc(s, pkt_safi); /* SAFI */
2737
2738 /* Nexthop AFI */
ce78a6fb 2739 if (afi == AFI_IP
2740 && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST))
d62a17ae 2741 nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP;
d62a17ae 2742 else
2743 nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len);
2744
2745 /* Nexthop */
2746 bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr);
2747 switch (nh_afi) {
2748 case AFI_IP:
2749 switch (safi) {
2750 case SAFI_UNICAST:
2751 case SAFI_MULTICAST:
2752 case SAFI_LABELED_UNICAST:
2753 stream_putc(s, 4);
2754 stream_put_ipv4(s, attr->nexthop.s_addr);
2755 break;
2756 case SAFI_MPLS_VPN:
2757 stream_putc(s, 12);
2758 stream_putl(s, 0); /* RD = 0, per RFC */
2759 stream_putl(s, 0);
2760 stream_put(s, &attr->mp_nexthop_global_in, 4);
2761 break;
2762 case SAFI_ENCAP:
2763 case SAFI_EVPN:
2764 stream_putc(s, 4);
2765 stream_put(s, &attr->mp_nexthop_global_in, 4);
2766 break;
7c40bf39 2767 case SAFI_FLOWSPEC:
2768 stream_putc(s, 0); /* no nexthop for flowspec */
d62a17ae 2769 default:
2770 break;
2771 }
2772 break;
2773 case AFI_IP6:
2774 switch (safi) {
2775 case SAFI_UNICAST:
2776 case SAFI_MULTICAST:
2777 case SAFI_LABELED_UNICAST:
2778 case SAFI_EVPN: {
2779 if (attr->mp_nexthop_len
2780 == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) {
2781 stream_putc(s,
2782 BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL);
2783 stream_put(s, &attr->mp_nexthop_global,
2784 IPV6_MAX_BYTELEN);
2785 stream_put(s, &attr->mp_nexthop_local,
2786 IPV6_MAX_BYTELEN);
2787 } else {
2788 stream_putc(s, IPV6_MAX_BYTELEN);
2789 stream_put(s, &attr->mp_nexthop_global,
2790 IPV6_MAX_BYTELEN);
2791 }
2792 } break;
2793 case SAFI_MPLS_VPN: {
2794 if (attr->mp_nexthop_len
2795 == BGP_ATTR_NHLEN_IPV6_GLOBAL) {
2796 stream_putc(s, 24);
2797 stream_putl(s, 0); /* RD = 0, per RFC */
2798 stream_putl(s, 0);
2799 stream_put(s, &attr->mp_nexthop_global,
2800 IPV6_MAX_BYTELEN);
2801 } else if (attr->mp_nexthop_len
2802 == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) {
2803 stream_putc(s, 48);
2804 stream_putl(s, 0); /* RD = 0, per RFC */
2805 stream_putl(s, 0);
2806 stream_put(s, &attr->mp_nexthop_global,
2807 IPV6_MAX_BYTELEN);
2808 stream_putl(s, 0); /* RD = 0, per RFC */
2809 stream_putl(s, 0);
2810 stream_put(s, &attr->mp_nexthop_local,
2811 IPV6_MAX_BYTELEN);
2812 }
2813 } break;
2814 case SAFI_ENCAP:
2815 stream_putc(s, IPV6_MAX_BYTELEN);
2816 stream_put(s, &attr->mp_nexthop_global,
2817 IPV6_MAX_BYTELEN);
2818 break;
7c40bf39 2819 case SAFI_FLOWSPEC:
2820 stream_putc(s, 0); /* no nexthop for flowspec */
d62a17ae 2821 default:
2822 break;
2823 }
2824 break;
8c71e481 2825 default:
a83da8e1 2826 if (safi != SAFI_FLOWSPEC)
af4c2728 2827 flog_err(
14454c9f
DS		 2828 BGP_ERR_ATTR_NH_SEND_LEN,
2829 "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d",
2830 peer->host, afi, safi, attr->mp_nexthop_len);
d62a17ae 2831 break;
2832 }
2833
2834 /* SNPA */
2835 stream_putc(s, 0);
2836 return sizep;
2837}
2838
2839void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi,
2840 struct prefix *p, struct prefix_rd *prd,
d7c0a89a
QY		 2841 mpls_label_t *label, uint32_t num_labels,
2842 int addpath_encode, uint32_t addpath_tx_id,
b57ba6d2 2843 struct attr *attr)
d62a17ae 2844{
2845 if (safi == SAFI_MPLS_VPN) {
2846 if (addpath_encode)
2847 stream_putl(s, addpath_tx_id);
2848 /* Label, RD, Prefix write. */
2849 stream_putc(s, p->prefixlen + 88);
2850 stream_put(s, label, BGP_LABEL_BYTES);
2851 stream_put(s, prd->val, 8);
2852 stream_put(s, &p->u.prefix, PSIZE(p->prefixlen));
2853 } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) {
2854 /* EVPN prefix - contents depend on type */
996c9314
LB		 2855 bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr,
2856 addpath_encode, addpath_tx_id);
d62a17ae 2857 } else if (safi == SAFI_LABELED_UNICAST) {
2858 /* Prefix write with label. */
2859 stream_put_labeled_prefix(s, p, label);
7c40bf39 2860 } else if (safi == SAFI_FLOWSPEC) {
2861 if (PSIZE (p->prefixlen)+2 < FLOWSPEC_NLRI_SIZELIMIT)
2862 stream_putc(s, PSIZE (p->prefixlen)+2);
2863 else
2864 stream_putw(s, (PSIZE (p->prefixlen)+2)|(0xf<<12));
2865 stream_putc(s, 2);/* Filter type */
2866 stream_putc(s, p->prefixlen);/* Prefix length */
2867 stream_put(s, &p->u.prefix, PSIZE (p->prefixlen));
d62a17ae 2868 } else
2869 stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id);
2870}
2871
2872size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p)
2873{
2874 int size = PSIZE(p->prefixlen);
2875 if (safi == SAFI_MPLS_VPN)
2876 size += 88;
2877 else if (afi == AFI_L2VPN && safi == SAFI_EVPN)
2878 size += 232; // TODO: Maximum possible for type-2, type-3 and
2879 // type-5
2880 return size;
8c71e481
PM		 2881}
2882
f4c89855 2883/*
65efcfce 2884 * Encodes the tunnel encapsulation attribute,
d62a17ae 2885 * and with ENABLE_BGP_VNC the VNC attribute which uses
65efcfce 2886 * almost the same TLV format
f4c89855 2887 */
d62a17ae 2888static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer,
2889 struct stream *s, struct attr *attr,
2890 uint8_t attrtype)
2891{
2892 unsigned int attrlenfield = 0;
2893 unsigned int attrhdrlen = 0;
2894 struct bgp_attr_encap_subtlv *subtlvs;
2895 struct bgp_attr_encap_subtlv *st;
2896 const char *attrname;
2897
9d303b37
DL		 2898 if (!attr || (attrtype == BGP_ATTR_ENCAP
2899 && (!attr->encap_tunneltype
2900 || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS)))
d62a17ae 2901 return;
2902
2903 switch (attrtype) {
f4c89855 2904 case BGP_ATTR_ENCAP:
d62a17ae 2905 attrname = "Tunnel Encap";
2906 subtlvs = attr->encap_subtlvs;
2907 if (subtlvs == NULL) /* nothing to do */
2908 return;
2909 /*
2910 * The tunnel encap attr has an "outer" tlv.
2911 * T = tunneltype,
2912 * L = total length of subtlvs,
2913 * V = concatenated subtlvs.
2914 */
2915 attrlenfield = 2 + 2; /* T + L */
2916 attrhdrlen = 1 + 1; /* subTLV T + L */
2917 break;
f4c89855 2918
65efcfce
LB		 2919#if ENABLE_BGP_VNC
2920 case BGP_ATTR_VNC:
d62a17ae 2921 attrname = "VNC";
2922 subtlvs = attr->vnc_subtlvs;
2923 if (subtlvs == NULL) /* nothing to do */
2924 return;
2925 attrlenfield = 0; /* no outer T + L */
2926 attrhdrlen = 2 + 2; /* subTLV T + L */
2927 break;
65efcfce
LB		 2928#endif
2929
f4c89855 2930 default:
d62a17ae 2931 assert(0);
2932 }
2933
2934 /* compute attr length */
2935 for (st = subtlvs; st; st = st->next) {
2936 attrlenfield += (attrhdrlen + st->length);
2937 }
2938
2939 if (attrlenfield > 0xffff) {
2940 zlog_info("%s attribute is too long (length=%d), can't send it",
2941 attrname, attrlenfield);
2942 return;
2943 }
2944
2945 if (attrlenfield > 0xff) {
2946 /* 2-octet length field */
996c9314
LB		 2947 stream_putc(s,
2948 BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL
2949 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 2950 stream_putc(s, attrtype);
2951 stream_putw(s, attrlenfield & 0xffff);
2952 } else {
2953 /* 1-octet length field */
2954 stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL);
2955 stream_putc(s, attrtype);
2956 stream_putc(s, attrlenfield & 0xff);
2957 }
2958
2959 if (attrtype == BGP_ATTR_ENCAP) {
2960 /* write outer T+L */
2961 stream_putw(s, attr->encap_tunneltype);
2962 stream_putw(s, attrlenfield - 4);
2963 }
2964
2965 /* write each sub-tlv */
2966 for (st = subtlvs; st; st = st->next) {
2967 if (attrtype == BGP_ATTR_ENCAP) {
2968 stream_putc(s, st->type);
2969 stream_putc(s, st->length);
65efcfce 2970#if ENABLE_BGP_VNC
d62a17ae 2971 } else {
2972 stream_putw(s, st->type);
2973 stream_putw(s, st->length);
65efcfce 2974#endif
d62a17ae 2975 }
2976 stream_put(s, st->value, st->length);
2977 }
f4c89855 2978}
f4c89855 2979
d62a17ae 2980void bgp_packet_mpattr_end(struct stream *s, size_t sizep)
8c71e481 2981{
d62a17ae 2982 /* Set MP attribute length. Don't count the (2) bytes used to encode
2983 the attr length */
2984 stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2);
8c71e481
PM		 2985}
2986
718e3744 2987/* Make attribute packet. */
d62a17ae 2988bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer,
2989 struct stream *s, struct attr *attr,
2990 struct bpacket_attr_vec_arr *vecarr,
2991 struct prefix *p, afi_t afi, safi_t safi,
2992 struct peer *from, struct prefix_rd *prd,
d7c0a89a
QY		 2993 mpls_label_t *label, uint32_t num_labels,
2994 int addpath_encode, uint32_t addpath_tx_id)
d62a17ae 2995{
2996 size_t cp;
2997 size_t aspath_sizep;
2998 struct aspath *aspath;
2999 int send_as4_path = 0;
3000 int send_as4_aggregator = 0;
3001 int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0;
3002
3003 if (!bgp)
3004 bgp = peer->bgp;
3005
3006 /* Remember current pointer. */
3007 cp = stream_get_endp(s);
3008
3009 if (p
3010 && !((afi == AFI_IP && safi == SAFI_UNICAST)
3011 && !peer_cap_enhe(peer, afi, safi))) {
3012 size_t mpattrlen_pos = 0;
3013
3014 mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi,
3015 vecarr, attr);
996c9314
LB		 3016 bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label,
3017 num_labels, addpath_encode,
3018 addpath_tx_id, attr);
d62a17ae 3019 bgp_packet_mpattr_end(s, mpattrlen_pos);
718e3744 3020 }
d62a17ae 3021
3022 /* Origin attribute. */
3023 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3024 stream_putc(s, BGP_ATTR_ORIGIN);
3025 stream_putc(s, 1);
3026 stream_putc(s, attr->origin);
3027
3028 /* AS path attribute. */
3029
3030 /* If remote-peer is EBGP */
3031 if (peer->sort == BGP_PEER_EBGP
3032 && (!CHECK_FLAG(peer->af_flags[afi][safi],
3033 PEER_FLAG_AS_PATH_UNCHANGED)
3034 || attr->aspath->segments == NULL)
3035 && (!CHECK_FLAG(peer->af_flags[afi][safi],
3036 PEER_FLAG_RSERVER_CLIENT))) {
3037 aspath = aspath_dup(attr->aspath);
3038
3039 /* Even though we may not be configured for confederations we
3040 * may have
3041 * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */
3042 aspath = aspath_delete_confed_seq(aspath);
3043
3044 if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) {
3045 /* Stuff our path CONFED_ID on the front */
3046 aspath = aspath_add_seq(aspath, bgp->confed_id);
3047 } else {
3048 if (peer->change_local_as) {
3049 /* If replace-as is specified, we only use the
3050 change_local_as when
3051 advertising routes. */
3052 if (!CHECK_FLAG(
3053 peer->flags,
3054 PEER_FLAG_LOCAL_AS_REPLACE_AS)) {
3055 aspath = aspath_add_seq(aspath,
3056 peer->local_as);
3057 }
3058 aspath = aspath_add_seq(aspath,
3059 peer->change_local_as);
3060 } else {
3061 aspath = aspath_add_seq(aspath, peer->local_as);
3062 }
3063 }
3064 } else if (peer->sort == BGP_PEER_CONFED) {
3065 /* A confed member, so we need to do the AS_CONFED_SEQUENCE
3066 * thing */
3067 aspath = aspath_dup(attr->aspath);
3068 aspath = aspath_add_confed_seq(aspath, peer->local_as);
3069 } else
3070 aspath = attr->aspath;
3071
3072 /* If peer is not AS4 capable, then:
3073 * - send the created AS_PATH out as AS4_PATH (optional, transitive),
3074 * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path
3075 * segment
3076 * types are in it (i.e. exclude them if they are there)
3077 * AND do this only if there is at least one asnum > 65535 in the
3078 * path!
3079 * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and
3080 * change
3081 * all ASnums > 65535 to BGP_AS_TRANS
3082 */
3083
3084 stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN);
3085 stream_putc(s, BGP_ATTR_AS_PATH);
3086 aspath_sizep = stream_get_endp(s);
3087 stream_putw(s, 0);
3088 stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit));
3089
3090 /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs
3091 * in the path
3092 */
3093 if (!use32bit && aspath_has_as4(aspath))
3094 send_as4_path =
3095 1; /* we'll do this later, at the correct place */
3096
3097 /* Nexthop attribute. */
3098 if (afi == AFI_IP && safi == SAFI_UNICAST
3099 && !peer_cap_enhe(peer, afi, safi)) {
3100 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) {
3101 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3102 stream_putc(s, BGP_ATTR_NEXT_HOP);
3103 bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s,
3104 attr);
3105 stream_putc(s, 4);
3106 stream_put_ipv4(s, attr->nexthop.s_addr);
3107 } else if (peer_cap_enhe(from, afi, safi)) {
3108 /*
3109 * Likely this is the case when an IPv4 prefix was
3110 * received with
3111 * Extended Next-hop capability and now being advertised
3112 * to
3113 * non-ENHE peers.
3114 * Setting the mandatory (ipv4) next-hop attribute here
3115 * to enable
3116 * implicit next-hop self with correct (ipv4 address
3117 * family).
3118 */
3119 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3120 stream_putc(s, BGP_ATTR_NEXT_HOP);
3121 bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s,
3122 NULL);
3123 stream_putc(s, 4);
3124 stream_put_ipv4(s, 0);
3125 }
718e3744 3126 }
d62a17ae 3127
3128 /* MED attribute. */
3129 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)
3130 || bgp->maxmed_active) {
3131 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
3132 stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC);
3133 stream_putc(s, 4);
3134 stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value
3135 : attr->med));
3136 }
3137
3138 /* Local preference. */
3139 if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) {
3140 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3141 stream_putc(s, BGP_ATTR_LOCAL_PREF);
3142 stream_putc(s, 4);
3143 stream_putl(s, attr->local_pref);
3144 }
3145
3146 /* Atomic aggregate. */
3147 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) {
3148 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3149 stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE);
3150 stream_putc(s, 0);
3151 }
3152
3153 /* Aggregator. */
3154 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) {
3155 /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */
3156 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS);
3157 stream_putc(s, BGP_ATTR_AGGREGATOR);
3158
3159 if (use32bit) {
3160 /* AS4 capable peer */
3161 stream_putc(s, 8);
3162 stream_putl(s, attr->aggregator_as);
3163 } else {
3164 /* 2-byte AS peer */
3165 stream_putc(s, 6);
3166
3167 /* Is ASN representable in 2-bytes? Or must AS_TRANS be
3168 * used? */
3169 if (attr->aggregator_as > 65535) {
3170 stream_putw(s, BGP_AS_TRANS);
3171
3172 /* we have to send AS4_AGGREGATOR, too.
3173 * we'll do that later in order to send
3174 * attributes in ascending
3175 * order.
3176 */
3177 send_as4_aggregator = 1;
3178 } else
d7c0a89a 3179 stream_putw(s, (uint16_t)attr->aggregator_as);
d62a17ae 3180 }
3181 stream_put_ipv4(s, attr->aggregator_addr.s_addr);
3182 }
3183
3184 /* Community attribute. */
3185 if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY)
3186 && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) {
3187 if (attr->community->size * 4 > 255) {
996c9314
LB		 3188 stream_putc(s,
3189 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
3190 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 3191 stream_putc(s, BGP_ATTR_COMMUNITIES);
3192 stream_putw(s, attr->community->size * 4);
3193 } else {
996c9314
LB		 3194 stream_putc(s,
3195 BGP_ATTR_FLAG_OPTIONAL
3196 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3197 stream_putc(s, BGP_ATTR_COMMUNITIES);
3198 stream_putc(s, attr->community->size * 4);
4372df71 3199 }
d62a17ae 3200 stream_put(s, attr->community->val, attr->community->size * 4);
3201 }
3202
3203 /*
3204 * Large Community attribute.
3205 */
3206 if (CHECK_FLAG(peer->af_flags[afi][safi],
3207 PEER_FLAG_SEND_LARGE_COMMUNITY)
3208 && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) {
79dab4b7 3209 if (lcom_length(attr->lcommunity) > 255) {
996c9314
LB		 3210 stream_putc(s,
3211 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
3212 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 3213 stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
79dab4b7 3214 stream_putw(s, lcom_length(attr->lcommunity));
d62a17ae 3215 } else {
996c9314
LB		 3216 stream_putc(s,
3217 BGP_ATTR_FLAG_OPTIONAL
3218 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3219 stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
79dab4b7 3220 stream_putc(s, lcom_length(attr->lcommunity));
4372df71 3221 }
d62a17ae 3222 stream_put(s, attr->lcommunity->val,
79dab4b7 3223 lcom_length(attr->lcommunity));
d62a17ae 3224 }
4372df71 3225
d62a17ae 3226 /* Route Reflector. */
3227 if (peer->sort == BGP_PEER_IBGP && from
3228 && from->sort == BGP_PEER_IBGP) {
3229 /* Originator ID. */
3230 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
3231 stream_putc(s, BGP_ATTR_ORIGINATOR_ID);
3232 stream_putc(s, 4);
3233
3234 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID))
3235 stream_put_in_addr(s, &attr->originator_id);
3236 else
3237 stream_put_in_addr(s, &from->remote_id);
3238
3239 /* Cluster list. */
3240 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
3241 stream_putc(s, BGP_ATTR_CLUSTER_LIST);
3242
3243 if (attr->cluster) {
3244 stream_putc(s, attr->cluster->length + 4);
3245 /* If this peer configuration's parent BGP has
3246 * cluster_id. */
3247 if (bgp->config & BGP_CONFIG_CLUSTER_ID)
3248 stream_put_in_addr(s, &bgp->cluster_id);
3249 else
3250 stream_put_in_addr(s, &bgp->router_id);
3251 stream_put(s, attr->cluster->list,
3252 attr->cluster->length);
3253 } else {
3254 stream_putc(s, 4);
3255 /* If this peer configuration's parent BGP has
3256 * cluster_id. */
3257 if (bgp->config & BGP_CONFIG_CLUSTER_ID)
3258 stream_put_in_addr(s, &bgp->cluster_id);
3259 else
3260 stream_put_in_addr(s, &bgp->router_id);
3261 }
3262 }
4372df71 3263
d62a17ae 3264 /* Extended Communities attribute. */
3265 if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY)
3266 && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) {
3267 if (peer->sort == BGP_PEER_IBGP
3268 || peer->sort == BGP_PEER_CONFED) {
3269 if (attr->ecommunity->size * 8 > 255) {
996c9314
LB		 3270 stream_putc(s,
3271 BGP_ATTR_FLAG_OPTIONAL
3272 | BGP_ATTR_FLAG_TRANS
3273 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 3274 stream_putc(s, BGP_ATTR_EXT_COMMUNITIES);
3275 stream_putw(s, attr->ecommunity->size * 8);
3276 } else {
996c9314
LB		 3277 stream_putc(s,
3278 BGP_ATTR_FLAG_OPTIONAL
3279 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3280 stream_putc(s, BGP_ATTR_EXT_COMMUNITIES);
3281 stream_putc(s, attr->ecommunity->size * 8);
3282 }
3283 stream_put(s, attr->ecommunity->val,
3284 attr->ecommunity->size * 8);
3285 } else {
d7c0a89a 3286 uint8_t *pnt;
d62a17ae 3287 int tbit;
3288 int ecom_tr_size = 0;
3289 int i;
3290
3291 for (i = 0; i < attr->ecommunity->size; i++) {
3292 pnt = attr->ecommunity->val + (i * 8);
3293 tbit = *pnt;
3294
3295 if (CHECK_FLAG(tbit,
3296 ECOMMUNITY_FLAG_NON_TRANSITIVE))
3297 continue;
3298
3299 ecom_tr_size++;
3300 }
3301
3302 if (ecom_tr_size) {
3303 if (ecom_tr_size * 8 > 255) {
3304 stream_putc(
3305 s,
3306 BGP_ATTR_FLAG_OPTIONAL
3307 | BGP_ATTR_FLAG_TRANS
3308 | BGP_ATTR_FLAG_EXTLEN);
3309 stream_putc(s,
3310 BGP_ATTR_EXT_COMMUNITIES);
3311 stream_putw(s, ecom_tr_size * 8);
3312 } else {
3313 stream_putc(
3314 s,
3315 BGP_ATTR_FLAG_OPTIONAL
3316 | BGP_ATTR_FLAG_TRANS);
3317 stream_putc(s,
3318 BGP_ATTR_EXT_COMMUNITIES);
3319 stream_putc(s, ecom_tr_size * 8);
3320 }
3321
3322 for (i = 0; i < attr->ecommunity->size; i++) {
3323 pnt = attr->ecommunity->val + (i * 8);
3324 tbit = *pnt;
3325
3326 if (CHECK_FLAG(
3327 tbit,
3328 ECOMMUNITY_FLAG_NON_TRANSITIVE))
3329 continue;
3330
3331 stream_put(s, pnt, 8);
3332 }
3333 }
3334 }
3335 }
4372df71 3336
d62a17ae 3337 /* Label index attribute. */
3338 if (safi == SAFI_LABELED_UNICAST) {
3339 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) {
d7c0a89a 3340 uint32_t label_index;
d62a17ae 3341
3342 label_index = attr->label_index;
3343
3344 if (label_index != BGP_INVALID_LABEL_INDEX) {
996c9314
LB		 3345 stream_putc(s,
3346 BGP_ATTR_FLAG_OPTIONAL
3347 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3348 stream_putc(s, BGP_ATTR_PREFIX_SID);
3349 stream_putc(s, 10);
3350 stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX);
3351 stream_putw(s,
3352 BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
3353 stream_putc(s, 0); // reserved
3354 stream_putw(s, 0); // flags
3355 stream_putl(s, label_index);
3356 }
4372df71 3357 }
d62a17ae 3358 }
3359
3360 if (send_as4_path) {
3361 /* If the peer is NOT As4 capable, AND */
3362 /* there are ASnums > 65535 in path THEN
3363 * give out AS4_PATH */
3364
3365 /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET
3366 * path segments!
3367 * Hm, I wonder... confederation things *should* only be at
3368 * the beginning of an aspath, right? Then we should use
3369 * aspath_delete_confed_seq for this, because it is already
3370 * there! (JK)
3371 * Folks, talk to me: what is reasonable here!?
3372 */
3373 aspath = aspath_delete_confed_seq(aspath);
3374
996c9314
LB		 3375 stream_putc(s,
3376 BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL
3377 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 3378 stream_putc(s, BGP_ATTR_AS4_PATH);
3379 aspath_sizep = stream_get_endp(s);
3380 stream_putw(s, 0);
3381 stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1));
3382 }
3383
3384 if (aspath != attr->aspath)
3385 aspath_free(aspath);
3386
3387 if (send_as4_aggregator) {
3388 /* send AS4_AGGREGATOR, at this place */
3389 /* this section of code moved here in order to ensure the
3390 * correct
3391 * *ascending* order of attributes
3392 */
3393 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS);
3394 stream_putc(s, BGP_ATTR_AS4_AGGREGATOR);
3395 stream_putc(s, 8);
3396 stream_putl(s, attr->aggregator_as);
3397 stream_put_ipv4(s, attr->aggregator_addr.s_addr);
3398 }
3399
3400 if (((afi == AFI_IP || afi == AFI_IP6)
3401 && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN))
3402 || (afi == AFI_L2VPN && safi == SAFI_EVPN)) {
3403 /* Tunnel Encap attribute */
3404 bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP);
65efcfce
LB		 3405
3406#if ENABLE_BGP_VNC
d62a17ae 3407 /* VNC attribute */
3408 bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC);
65efcfce 3409#endif
d62a17ae 3410 }
587ff0fd 3411
a21bd7a3
DW		 3412 /* PMSI Tunnel */
3413 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) {
3414 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS);
3415 stream_putc(s, BGP_ATTR_PMSI_TUNNEL);
3416 stream_putc(s, 9); // Length
3417 stream_putc(s, 0); // Flags
7fd077aa 3418 stream_putc(s, PMSI_TNLTYPE_INGR_REPL); // IR (6)
996c9314
LB		 3419 stream_put(s, &(attr->label),
3420 BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI
30d85a30
LB		 3421 stream_put_ipv4(s, attr->nexthop.s_addr);
3422 // Unicast tunnel endpoint IP address
a21bd7a3
DW		 3423 }
3424
d62a17ae 3425 /* Unknown transit attribute. */
3426 if (attr->transit)
3427 stream_put(s, attr->transit->val, attr->transit->length);
718e3744 3428
d62a17ae 3429 /* Return total size of attribute. */
3430 return stream_get_endp(s) - cp;
718e3744 3431}
3432
d62a17ae 3433size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi)
718e3744 3434{
d62a17ae 3435 unsigned long attrlen_pnt;
3436 iana_afi_t pkt_afi;
5c525538 3437 iana_safi_t pkt_safi;
718e3744 3438
d62a17ae 3439 /* Set extended bit always to encode the attribute length as 2 bytes */
3440 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN);
3441 stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI);
718e3744 3442
d62a17ae 3443 attrlen_pnt = stream_get_endp(s);
3444 stream_putw(s, 0); /* Length of this attribute. */
718e3744 3445
d62a17ae 3446 /* Convert AFI, SAFI to values for packet. */
3447 bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi);
9cabb64b 3448
d62a17ae 3449 stream_putw(s, pkt_afi);
3450 stream_putc(s, pkt_safi);
9cabb64b 3451
d62a17ae 3452 return attrlen_pnt;
8c71e481 3453}
718e3744 3454
d62a17ae 3455void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi,
3456 safi_t safi, struct prefix_rd *prd,
d7c0a89a
QY		 3457 mpls_label_t *label, uint32_t num_labels,
3458 int addpath_encode, uint32_t addpath_tx_id,
b57ba6d2 3459 struct attr *attr)
8c71e481 3460{
d7c0a89a 3461 uint8_t wlabel[3] = {0x80, 0x00, 0x00};
cd1964ff 3462
b57ba6d2 3463 if (safi == SAFI_LABELED_UNICAST) {
d62a17ae 3464 label = (mpls_label_t *)wlabel;
b57ba6d2
MK		 3465 num_labels = 1;
3466 }
cd1964ff 3467
996c9314 3468 return bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels,
d62a17ae 3469 addpath_encode, addpath_tx_id, attr);
8c71e481 3470}
718e3744 3471
d62a17ae 3472void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt)
8c71e481 3473{
d62a17ae 3474 bgp_packet_mpattr_end(s, attrlen_pnt);
718e3744 3475}
3476
3477/* Initialization of attribute. */
d62a17ae 3478void bgp_attr_init(void)
718e3744 3479{
d62a17ae 3480 aspath_init();
3481 attrhash_init();
3482 community_init();
3483 ecommunity_init();
3484 lcommunity_init();
3485 cluster_init();
3486 transit_init();
3487 encap_init();
718e3744 3488}
3489
d62a17ae 3490void bgp_attr_finish(void)
228da428 3491{
d62a17ae 3492 aspath_finish();
3493 attrhash_finish();
3494 community_finish();
3495 ecommunity_finish();
3496 lcommunity_finish();
3497 cluster_finish();
3498 transit_finish();
3499 encap_finish();
228da428
CC		 3500}
3501
718e3744 3502/* Make attribute packet. */
d62a17ae 3503void bgp_dump_routes_attr(struct stream *s, struct attr *attr,
3504 struct prefix *prefix)
3505{
3506 unsigned long cp;
3507 unsigned long len;
3508 size_t aspath_lenp;
3509 struct aspath *aspath;
3510 int addpath_encode = 0;
d7c0a89a 3511 uint32_t addpath_tx_id = 0;
d62a17ae 3512
3513 /* Remember current pointer. */
3514 cp = stream_get_endp(s);
3515
3516 /* Place holder of length. */
3517 stream_putw(s, 0);
3518
3519 /* Origin attribute. */
3520 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3521 stream_putc(s, BGP_ATTR_ORIGIN);
3522 stream_putc(s, 1);
3523 stream_putc(s, attr->origin);
3524
3525 aspath = attr->aspath;
3526
3527 stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN);
3528 stream_putc(s, BGP_ATTR_AS_PATH);
3529 aspath_lenp = stream_get_endp(s);
3530 stream_putw(s, 0);
3531
3532 stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1));
3533
3534 /* Nexthop attribute. */
3535 /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */
3536 if (prefix != NULL && prefix->family != AF_INET6) {
3537 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3538 stream_putc(s, BGP_ATTR_NEXT_HOP);
3539 stream_putc(s, 4);
3540 stream_put_ipv4(s, attr->nexthop.s_addr);
718e3744 3541 }
d62a17ae 3542
3543 /* MED attribute. */
3544 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) {
3545 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
3546 stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC);
3547 stream_putc(s, 4);
3548 stream_putl(s, attr->med);
3549 }
3550
3551 /* Local preference. */
3552 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) {
3553 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3554 stream_putc(s, BGP_ATTR_LOCAL_PREF);
3555 stream_putc(s, 4);
3556 stream_putl(s, attr->local_pref);
3557 }
3558
3559 /* Atomic aggregate. */
3560 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) {
3561 stream_putc(s, BGP_ATTR_FLAG_TRANS);
3562 stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE);
3563 stream_putc(s, 0);
3564 }
3565
3566 /* Aggregator. */
3567 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) {
3568 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS);
3569 stream_putc(s, BGP_ATTR_AGGREGATOR);
3570 stream_putc(s, 8);
3571 stream_putl(s, attr->aggregator_as);
3572 stream_put_ipv4(s, attr->aggregator_addr.s_addr);
3573 }
3574
3575 /* Community attribute. */
3576 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) {
3577 if (attr->community->size * 4 > 255) {
996c9314
LB		 3578 stream_putc(s,
3579 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
3580 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 3581 stream_putc(s, BGP_ATTR_COMMUNITIES);
3582 stream_putw(s, attr->community->size * 4);
3583 } else {
996c9314
LB		 3584 stream_putc(s,
3585 BGP_ATTR_FLAG_OPTIONAL
3586 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3587 stream_putc(s, BGP_ATTR_COMMUNITIES);
3588 stream_putc(s, attr->community->size * 4);
3589 }
3590 stream_put(s, attr->community->val, attr->community->size * 4);
3591 }
3592
3593 /* Large Community attribute. */
3594 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) {
79dab4b7 3595 if (lcom_length(attr->lcommunity) > 255) {
996c9314
LB		 3596 stream_putc(s,
3597 BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
3598 | BGP_ATTR_FLAG_EXTLEN);
d62a17ae 3599 stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
79dab4b7 3600 stream_putw(s, lcom_length(attr->lcommunity));
d62a17ae 3601 } else {
996c9314
LB		 3602 stream_putc(s,
3603 BGP_ATTR_FLAG_OPTIONAL
3604 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3605 stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
79dab4b7 3606 stream_putc(s, lcom_length(attr->lcommunity));
d62a17ae 3607 }
3608
996c9314
LB		 3609 stream_put(s, attr->lcommunity->val,
3610 lcom_length(attr->lcommunity));
d62a17ae 3611 }
3612
3613 /* Add a MP_NLRI attribute to dump the IPv6 next hop */
3614 if (prefix != NULL && prefix->family == AF_INET6
3615 && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL
3616 || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) {
3617 int sizep;
3618
3619 stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
3620 stream_putc(s, BGP_ATTR_MP_REACH_NLRI);
3621 sizep = stream_get_endp(s);
3622
3623 /* MP header */
3624 stream_putc(s, 0); /* Marker: Attribute length. */
3625 stream_putw(s, AFI_IP6); /* AFI */
3626 stream_putc(s, SAFI_UNICAST); /* SAFI */
3627
3628 /* Next hop */
3629 stream_putc(s, attr->mp_nexthop_len);
3630 stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN);
3631 if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)
3632 stream_put(s, &attr->mp_nexthop_local,
3633 IPV6_MAX_BYTELEN);
3634
3635 /* SNPA */
3636 stream_putc(s, 0);
3637
3638 /* Prefix */
3639 stream_put_prefix_addpath(s, prefix, addpath_encode,
3640 addpath_tx_id);
3641
3642 /* Set MP attribute length. */
3643 stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1);
3644 }
3645
3646 /* Prefix SID */
3647 if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) {
3648 if (attr->label_index != BGP_INVALID_LABEL_INDEX) {
996c9314
LB		 3649 stream_putc(s,
3650 BGP_ATTR_FLAG_OPTIONAL
3651 | BGP_ATTR_FLAG_TRANS);
d62a17ae 3652 stream_putc(s, BGP_ATTR_PREFIX_SID);
3653 stream_putc(s, 10);
3654 stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX);
3655 stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
3656 stream_putc(s, 0); // reserved
3657 stream_putw(s, 0); // flags
3658 stream_putl(s, attr->label_index);
3659 }
3660 }
3661
3662 /* Return total size of attribute. */
3663 len = stream_get_endp(s) - cp - 2;
3664 stream_putw_at(s, cp, len);
718e3744 3665}
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