1 /* BGP attributes management routines.
2 * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro
4 * This file is part of GNU Zebra.
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
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.
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
36 #include "bgpd/bgpd.h"
37 #include "bgpd/bgp_attr.h"
38 #include "bgpd/bgp_route.h"
39 #include "bgpd/bgp_aspath.h"
40 #include "bgpd/bgp_community.h"
41 #include "bgpd/bgp_debug.h"
42 #include "bgpd/bgp_label.h"
43 #include "bgpd/bgp_packet.h"
44 #include "bgpd/bgp_ecommunity.h"
45 #include "bgpd/bgp_lcommunity.h"
46 #include "bgpd/bgp_updgrp.h"
47 #include "bgpd/bgp_encap_types.h"
49 #include "bgpd/rfapi/bgp_rfapi_cfg.h"
50 #include "bgp_encap_types.h"
51 #include "bgp_vnc_types.h"
53 #include "bgp_encap_types.h"
56 /* Attribute strings for logging. */
57 static const struct message attr_str
[] = {
58 {BGP_ATTR_ORIGIN
, "ORIGIN"},
59 {BGP_ATTR_AS_PATH
, "AS_PATH"},
60 {BGP_ATTR_NEXT_HOP
, "NEXT_HOP"},
61 {BGP_ATTR_MULTI_EXIT_DISC
, "MULTI_EXIT_DISC"},
62 {BGP_ATTR_LOCAL_PREF
, "LOCAL_PREF"},
63 {BGP_ATTR_ATOMIC_AGGREGATE
, "ATOMIC_AGGREGATE"},
64 {BGP_ATTR_AGGREGATOR
, "AGGREGATOR"},
65 {BGP_ATTR_COMMUNITIES
, "COMMUNITY"},
66 {BGP_ATTR_ORIGINATOR_ID
, "ORIGINATOR_ID"},
67 {BGP_ATTR_CLUSTER_LIST
, "CLUSTER_LIST"},
68 {BGP_ATTR_DPA
, "DPA"},
69 {BGP_ATTR_ADVERTISER
, "ADVERTISER"},
70 {BGP_ATTR_RCID_PATH
, "RCID_PATH"},
71 {BGP_ATTR_MP_REACH_NLRI
, "MP_REACH_NLRI"},
72 {BGP_ATTR_MP_UNREACH_NLRI
, "MP_UNREACH_NLRI"},
73 {BGP_ATTR_EXT_COMMUNITIES
, "EXT_COMMUNITIES"},
74 {BGP_ATTR_AS4_PATH
, "AS4_PATH"},
75 {BGP_ATTR_AS4_AGGREGATOR
, "AS4_AGGREGATOR"},
76 {BGP_ATTR_AS_PATHLIMIT
, "AS_PATHLIMIT"},
77 {BGP_ATTR_ENCAP
, "ENCAP"},
79 {BGP_ATTR_VNC
, "VNC"},
81 {BGP_ATTR_LARGE_COMMUNITIES
, "LARGE_COMMUNITY"},
82 {BGP_ATTR_PREFIX_SID
, "PREFIX_SID"},
85 static const struct message attr_flag_str
[] =
87 {BGP_ATTR_FLAG_OPTIONAL
, "Optional"},
88 {BGP_ATTR_FLAG_TRANS
, "Transitive"},
89 {BGP_ATTR_FLAG_PARTIAL
, "Partial"},
90 /* bgp_attr_flags_diagnose() relies on this bit being last in
92 {BGP_ATTR_FLAG_EXTLEN
, "Extended Length"},
95 static struct hash
*cluster_hash
;
97 static void *cluster_hash_alloc(void *p
)
99 const struct cluster_list
*val
= (const struct cluster_list
*)p
;
100 struct cluster_list
*cluster
;
102 cluster
= XMALLOC(MTYPE_CLUSTER
, sizeof(struct cluster_list
));
103 cluster
->length
= val
->length
;
105 if (cluster
->length
) {
106 cluster
->list
= XMALLOC(MTYPE_CLUSTER_VAL
, val
->length
);
107 memcpy(cluster
->list
, val
->list
, val
->length
);
109 cluster
->list
= NULL
;
116 /* Cluster list related functions. */
117 static struct cluster_list
*cluster_parse(struct in_addr
*pnt
, int length
)
119 struct cluster_list tmp
;
120 struct cluster_list
*cluster
;
125 cluster
= hash_get(cluster_hash
, &tmp
, cluster_hash_alloc
);
130 int cluster_loop_check(struct cluster_list
*cluster
, struct in_addr originator
)
134 for (i
= 0; i
< cluster
->length
/ 4; i
++)
135 if (cluster
->list
[i
].s_addr
== originator
.s_addr
)
140 static unsigned int cluster_hash_key_make(void *p
)
142 const struct cluster_list
*cluster
= p
;
144 return jhash(cluster
->list
, cluster
->length
, 0);
147 static int cluster_hash_cmp(const void *p1
, const void *p2
)
149 const struct cluster_list
*cluster1
= p1
;
150 const struct cluster_list
*cluster2
= p2
;
152 return (cluster1
->length
== cluster2
->length
153 && memcmp(cluster1
->list
, cluster2
->list
, cluster1
->length
)
157 static void cluster_free(struct cluster_list
*cluster
)
160 XFREE(MTYPE_CLUSTER_VAL
, cluster
->list
);
161 XFREE(MTYPE_CLUSTER
, cluster
);
164 static struct cluster_list
*cluster_intern(struct cluster_list
*cluster
)
166 struct cluster_list
*find
;
168 find
= hash_get(cluster_hash
, cluster
, cluster_hash_alloc
);
174 void cluster_unintern(struct cluster_list
*cluster
)
179 if (cluster
->refcnt
== 0) {
180 hash_release(cluster_hash
, cluster
);
181 cluster_free(cluster
);
185 static void cluster_init(void)
187 cluster_hash
= hash_create(cluster_hash_key_make
,
192 static void cluster_finish(void)
194 hash_clean(cluster_hash
, (void (*)(void *))cluster_free
);
195 hash_free(cluster_hash
);
199 static struct hash
*encap_hash
= NULL
;
201 static struct hash
*vnc_hash
= NULL
;
204 struct bgp_attr_encap_subtlv
*encap_tlv_dup(struct bgp_attr_encap_subtlv
*orig
)
206 struct bgp_attr_encap_subtlv
*new;
207 struct bgp_attr_encap_subtlv
*tail
;
208 struct bgp_attr_encap_subtlv
*p
;
210 for (p
= orig
, tail
= new = NULL
; p
; p
= p
->next
) {
211 int size
= sizeof(struct bgp_attr_encap_subtlv
) - 1 + p
->length
;
213 tail
->next
= XCALLOC(MTYPE_ENCAP_TLV
, size
);
216 tail
= new = XCALLOC(MTYPE_ENCAP_TLV
, size
);
219 memcpy(tail
, p
, size
);
226 static void encap_free(struct bgp_attr_encap_subtlv
*p
)
228 struct bgp_attr_encap_subtlv
*next
;
232 XFREE(MTYPE_ENCAP_TLV
, p
);
237 void bgp_attr_flush_encap(struct attr
*attr
)
242 if (attr
->encap_subtlvs
) {
243 encap_free(attr
->encap_subtlvs
);
244 attr
->encap_subtlvs
= NULL
;
247 if (attr
->vnc_subtlvs
) {
248 encap_free(attr
->vnc_subtlvs
);
249 attr
->vnc_subtlvs
= NULL
;
255 * Compare encap sub-tlv chains
260 * This algorithm could be made faster if needed
262 static int encap_same(struct bgp_attr_encap_subtlv
*h1
,
263 struct bgp_attr_encap_subtlv
*h2
)
265 struct bgp_attr_encap_subtlv
*p
;
266 struct bgp_attr_encap_subtlv
*q
;
270 if (h1
== NULL
|| h2
== NULL
)
273 for (p
= h1
; p
; p
= p
->next
) {
274 for (q
= h2
; q
; q
= q
->next
) {
275 if ((p
->type
== q
->type
) && (p
->length
== q
->length
)
276 && !memcmp(p
->value
, q
->value
, p
->length
)) {
285 for (p
= h2
; p
; p
= p
->next
) {
286 for (q
= h1
; q
; q
= q
->next
) {
287 if ((p
->type
== q
->type
) && (p
->length
== q
->length
)
288 && !memcmp(p
->value
, q
->value
, p
->length
)) {
300 static void *encap_hash_alloc(void *p
)
302 /* Encap structure is already allocated. */
313 static struct bgp_attr_encap_subtlv
*
314 encap_intern(struct bgp_attr_encap_subtlv
*encap
, encap_subtlv_type type
)
316 struct bgp_attr_encap_subtlv
*find
;
317 struct hash
*hash
= encap_hash
;
319 if (type
== VNC_SUBTLV_TYPE
)
323 find
= hash_get(hash
, encap
, encap_hash_alloc
);
331 static void encap_unintern(struct bgp_attr_encap_subtlv
**encapp
,
332 encap_subtlv_type type
)
334 struct bgp_attr_encap_subtlv
*encap
= *encapp
;
338 if (encap
->refcnt
== 0) {
339 struct hash
*hash
= encap_hash
;
341 if (type
== VNC_SUBTLV_TYPE
)
344 hash_release(hash
, encap
);
350 static unsigned int encap_hash_key_make(void *p
)
352 const struct bgp_attr_encap_subtlv
*encap
= p
;
354 return jhash(encap
->value
, encap
->length
, 0);
357 static int encap_hash_cmp(const void *p1
, const void *p2
)
359 return encap_same((struct bgp_attr_encap_subtlv
*)p1
,
360 (struct bgp_attr_encap_subtlv
*)p2
);
363 static void encap_init(void)
365 encap_hash
= hash_create(encap_hash_key_make
,
369 vnc_hash
= hash_create(encap_hash_key_make
,
375 static void encap_finish(void)
377 hash_clean(encap_hash
, (void (*)(void *))encap_free
);
378 hash_free(encap_hash
);
381 hash_clean(vnc_hash
, (void (*)(void *))encap_free
);
387 static bool overlay_index_same(const struct attr
*a1
, const struct attr
*a2
)
395 return !memcmp(&(a1
->evpn_overlay
), &(a2
->evpn_overlay
),
396 sizeof(struct overlay_index
));
399 /* Unknown transit attribute. */
400 static struct hash
*transit_hash
;
402 static void transit_free(struct transit
*transit
)
405 XFREE(MTYPE_TRANSIT_VAL
, transit
->val
);
406 XFREE(MTYPE_TRANSIT
, transit
);
409 static void *transit_hash_alloc(void *p
)
411 /* Transit structure is already allocated. */
415 static struct transit
*transit_intern(struct transit
*transit
)
417 struct transit
*find
;
419 find
= hash_get(transit_hash
, transit
, transit_hash_alloc
);
421 transit_free(transit
);
427 void transit_unintern(struct transit
*transit
)
432 if (transit
->refcnt
== 0) {
433 hash_release(transit_hash
, transit
);
434 transit_free(transit
);
438 static unsigned int transit_hash_key_make(void *p
)
440 const struct transit
*transit
= p
;
442 return jhash(transit
->val
, transit
->length
, 0);
445 static int transit_hash_cmp(const void *p1
, const void *p2
)
447 const struct transit
*transit1
= p1
;
448 const struct transit
*transit2
= p2
;
450 return (transit1
->length
== transit2
->length
451 && memcmp(transit1
->val
, transit2
->val
, transit1
->length
) == 0);
454 static void transit_init(void)
456 transit_hash
= hash_create(transit_hash_key_make
,
461 static void transit_finish(void)
463 hash_clean(transit_hash
, (void (*)(void *))transit_free
);
464 hash_free(transit_hash
);
468 /* Attribute hash routines. */
469 static struct hash
*attrhash
;
471 /* Shallow copy of an attribute
472 * Though, not so shallow that it doesn't copy the contents
473 * of the attr_extra pointed to by 'extra'
475 void bgp_attr_dup(struct attr
*new, struct attr
*orig
)
480 unsigned long int attr_count(void)
482 return attrhash
->count
;
485 unsigned long int attr_unknown_count(void)
487 return transit_hash
->count
;
490 unsigned int attrhash_key_make(void *p
)
492 const struct attr
*attr
= (struct attr
*)p
;
494 #define MIX(val) key = jhash_1word(val, key)
497 MIX(attr
->nexthop
.s_addr
);
499 MIX(attr
->local_pref
);
500 MIX(attr
->aggregator_as
);
501 MIX(attr
->aggregator_addr
.s_addr
);
503 MIX(attr
->mp_nexthop_global_in
.s_addr
);
504 MIX(attr
->originator_id
.s_addr
);
507 MIX(attr
->label_index
);
510 MIX(aspath_key_make(attr
->aspath
));
512 MIX(community_hash_make(attr
->community
));
514 if (attr
->lcommunity
)
515 MIX(lcommunity_hash_make(attr
->lcommunity
));
516 if (attr
->ecommunity
)
517 MIX(ecommunity_hash_make(attr
->ecommunity
));
519 MIX(cluster_hash_key_make(attr
->cluster
));
521 MIX(transit_hash_key_make(attr
->transit
));
522 if (attr
->encap_subtlvs
)
523 MIX(encap_hash_key_make(attr
->encap_subtlvs
));
525 if (attr
->vnc_subtlvs
)
526 MIX(encap_hash_key_make(attr
->vnc_subtlvs
));
528 MIX(attr
->mp_nexthop_len
);
529 key
= jhash(attr
->mp_nexthop_global
.s6_addr
, IPV6_MAX_BYTELEN
, key
);
530 key
= jhash(attr
->mp_nexthop_local
.s6_addr
, IPV6_MAX_BYTELEN
, key
);
535 int attrhash_cmp(const void *p1
, const void *p2
)
537 const struct attr
*attr1
= p1
;
538 const struct attr
*attr2
= p2
;
540 if (attr1
->flag
== attr2
->flag
&& attr1
->origin
== attr2
->origin
541 && attr1
->nexthop
.s_addr
== attr2
->nexthop
.s_addr
542 && attr1
->aspath
== attr2
->aspath
543 && attr1
->community
== attr2
->community
&& attr1
->med
== attr2
->med
544 && attr1
->local_pref
== attr2
->local_pref
545 && attr1
->rmap_change_flags
== attr2
->rmap_change_flags
) {
546 if (attr1
->aggregator_as
== attr2
->aggregator_as
547 && attr1
->aggregator_addr
.s_addr
548 == attr2
->aggregator_addr
.s_addr
549 && attr1
->weight
== attr2
->weight
550 && attr1
->tag
== attr2
->tag
551 && attr1
->label_index
== attr2
->label_index
552 && attr1
->mp_nexthop_len
== attr2
->mp_nexthop_len
553 && IPV6_ADDR_SAME(&attr1
->mp_nexthop_global
,
554 &attr2
->mp_nexthop_global
)
555 && IPV6_ADDR_SAME(&attr1
->mp_nexthop_local
,
556 &attr2
->mp_nexthop_local
)
557 && IPV4_ADDR_SAME(&attr1
->mp_nexthop_global_in
,
558 &attr2
->mp_nexthop_global_in
)
559 && attr1
->ecommunity
== attr2
->ecommunity
560 && attr1
->lcommunity
== attr2
->lcommunity
561 && attr1
->cluster
== attr2
->cluster
562 && attr1
->transit
== attr2
->transit
563 && (attr1
->encap_tunneltype
== attr2
->encap_tunneltype
)
564 && encap_same(attr1
->encap_subtlvs
, attr2
->encap_subtlvs
)
566 && encap_same(attr1
->vnc_subtlvs
, attr2
->vnc_subtlvs
)
568 && IPV4_ADDR_SAME(&attr1
->originator_id
,
569 &attr2
->originator_id
)
570 && overlay_index_same(attr1
, attr2
))
577 static void attrhash_init(void)
579 attrhash
= hash_create(attrhash_key_make
,
585 * special for hash_clean below
587 static void attr_vfree(void *attr
)
589 XFREE(MTYPE_ATTR
, attr
);
592 static void attrhash_finish(void)
594 hash_clean(attrhash
, attr_vfree
);
599 static void attr_show_all_iterator(struct hash_backet
*backet
, struct vty
*vty
)
601 struct attr
*attr
= backet
->data
;
603 vty_out(vty
, "attr[%ld] nexthop %s\n", attr
->refcnt
,
604 inet_ntoa(attr
->nexthop
));
607 void attr_show_all(struct vty
*vty
)
609 hash_iterate(attrhash
, (void (*)(struct hash_backet
*,
610 void *))attr_show_all_iterator
,
614 static void *bgp_attr_hash_alloc(void *p
)
616 struct attr
*val
= (struct attr
*)p
;
619 attr
= XMALLOC(MTYPE_ATTR
, sizeof(struct attr
));
621 if (val
->encap_subtlvs
) {
622 val
->encap_subtlvs
= NULL
;
625 if (val
->vnc_subtlvs
) {
626 val
->vnc_subtlvs
= NULL
;
633 /* Internet argument attribute. */
634 struct attr
*bgp_attr_intern(struct attr
*attr
)
638 /* Intern referenced strucutre. */
640 if (!attr
->aspath
->refcnt
)
641 attr
->aspath
= aspath_intern(attr
->aspath
);
643 attr
->aspath
->refcnt
++;
645 if (attr
->community
) {
646 if (!attr
->community
->refcnt
)
647 attr
->community
= community_intern(attr
->community
);
649 attr
->community
->refcnt
++;
652 if (attr
->ecommunity
) {
653 if (!attr
->ecommunity
->refcnt
)
654 attr
->ecommunity
= ecommunity_intern(attr
->ecommunity
);
656 attr
->ecommunity
->refcnt
++;
658 if (attr
->lcommunity
) {
659 if (!attr
->lcommunity
->refcnt
)
660 attr
->lcommunity
= lcommunity_intern(attr
->lcommunity
);
662 attr
->lcommunity
->refcnt
++;
665 if (!attr
->cluster
->refcnt
)
666 attr
->cluster
= cluster_intern(attr
->cluster
);
668 attr
->cluster
->refcnt
++;
671 if (!attr
->transit
->refcnt
)
672 attr
->transit
= transit_intern(attr
->transit
);
674 attr
->transit
->refcnt
++;
676 if (attr
->encap_subtlvs
) {
677 if (!attr
->encap_subtlvs
->refcnt
)
678 attr
->encap_subtlvs
= encap_intern(attr
->encap_subtlvs
,
681 attr
->encap_subtlvs
->refcnt
++;
684 if (attr
->vnc_subtlvs
) {
685 if (!attr
->vnc_subtlvs
->refcnt
)
686 attr
->vnc_subtlvs
= encap_intern(attr
->vnc_subtlvs
,
689 attr
->vnc_subtlvs
->refcnt
++;
693 /* At this point, attr only contains intern'd pointers. that means
694 * if we find it in attrhash, it has all the same pointers and we
695 * correctly updated the refcounts on these.
696 * If we don't find it, we need to allocate a one because in all
697 * cases this returns a new reference to a hashed attr, but the input
699 find
= (struct attr
*)hash_get(attrhash
, attr
, bgp_attr_hash_alloc
);
705 /* Make network statement's attribute. */
706 struct attr
*bgp_attr_default_set(struct attr
*attr
, u_char origin
)
708 memset(attr
, 0, sizeof(struct attr
));
710 attr
->origin
= origin
;
711 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
);
712 attr
->aspath
= aspath_empty();
713 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
);
714 attr
->weight
= BGP_ATTR_DEFAULT_WEIGHT
;
716 attr
->label_index
= BGP_INVALID_LABEL_INDEX
;
717 attr
->label
= MPLS_INVALID_LABEL
;
718 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
);
719 attr
->mp_nexthop_len
= IPV6_MAX_BYTELEN
;
724 /* Create the attributes for an aggregate */
725 struct attr
*bgp_attr_aggregate_intern(struct bgp
*bgp
, u_char origin
,
726 struct aspath
*aspath
,
727 struct community
*community
, int as_set
,
728 u_char atomic_aggregate
)
733 memset(&attr
, 0, sizeof(struct attr
));
735 /* Origin attribute. */
736 attr
.origin
= origin
;
737 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
);
739 /* AS path attribute. */
741 attr
.aspath
= aspath_intern(aspath
);
743 attr
.aspath
= aspath_empty();
744 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
);
746 /* Next hop attribute. */
747 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
);
750 u_int32_t gshut
= COMMUNITY_GSHUT
;
752 /* If we are not shutting down ourselves and we are
753 * aggregating a route that contains the GSHUT community we
754 * need to remove that community when creating the aggregate */
755 if (!bgp_flag_check(bgp
, BGP_FLAG_GRACEFUL_SHUTDOWN
) &&
756 community_include(community
, gshut
)) {
757 community_del_val(community
, &gshut
);
760 attr
.community
= community
;
761 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
);
764 if (bgp_flag_check(bgp
, BGP_FLAG_GRACEFUL_SHUTDOWN
)) {
765 bgp_attr_add_gshut_community(&attr
);
768 attr
.label_index
= BGP_INVALID_LABEL_INDEX
;
769 attr
.label
= MPLS_INVALID_LABEL
;
770 attr
.weight
= BGP_ATTR_DEFAULT_WEIGHT
;
771 attr
.mp_nexthop_len
= IPV6_MAX_BYTELEN
;
772 if (!as_set
|| atomic_aggregate
)
773 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
);
774 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
);
775 if (CHECK_FLAG(bgp
->config
, BGP_CONFIG_CONFEDERATION
))
776 attr
.aggregator_as
= bgp
->confed_id
;
778 attr
.aggregator_as
= bgp
->as
;
779 attr
.aggregator_addr
= bgp
->router_id
;
780 attr
.label_index
= BGP_INVALID_LABEL_INDEX
;
781 attr
.label
= MPLS_INVALID_LABEL
;
783 new = bgp_attr_intern(&attr
);
785 aspath_unintern(&new->aspath
);
789 /* Unintern just the sub-components of the attr, but not the attr */
790 void bgp_attr_unintern_sub(struct attr
*attr
)
792 /* aspath refcount shoud be decrement. */
794 aspath_unintern(&attr
->aspath
);
795 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
));
798 community_unintern(&attr
->community
);
799 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
));
801 if (attr
->ecommunity
)
802 ecommunity_unintern(&attr
->ecommunity
);
803 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
));
805 if (attr
->lcommunity
)
806 lcommunity_unintern(&attr
->lcommunity
);
807 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
));
810 cluster_unintern(attr
->cluster
);
811 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST
));
814 transit_unintern(attr
->transit
);
816 if (attr
->encap_subtlvs
)
817 encap_unintern(&attr
->encap_subtlvs
, ENCAP_SUBTLV_TYPE
);
820 if (attr
->vnc_subtlvs
)
821 encap_unintern(&attr
->vnc_subtlvs
, VNC_SUBTLV_TYPE
);
825 /* Free bgp attribute and aspath. */
826 void bgp_attr_unintern(struct attr
**pattr
)
828 struct attr
*attr
= *pattr
;
832 /* Decrement attribute reference. */
837 /* If reference becomes zero then free attribute object. */
838 if (attr
->refcnt
== 0) {
839 ret
= hash_release(attrhash
, attr
);
841 XFREE(MTYPE_ATTR
, attr
);
845 bgp_attr_unintern_sub(&tmp
);
848 void bgp_attr_flush(struct attr
*attr
)
850 if (attr
->aspath
&& !attr
->aspath
->refcnt
) {
851 aspath_free(attr
->aspath
);
854 if (attr
->community
&& !attr
->community
->refcnt
) {
855 community_free(attr
->community
);
856 attr
->community
= NULL
;
859 if (attr
->ecommunity
&& !attr
->ecommunity
->refcnt
)
860 ecommunity_free(&attr
->ecommunity
);
861 if (attr
->lcommunity
&& !attr
->lcommunity
->refcnt
)
862 lcommunity_free(&attr
->lcommunity
);
863 if (attr
->cluster
&& !attr
->cluster
->refcnt
) {
864 cluster_free(attr
->cluster
);
865 attr
->cluster
= NULL
;
867 if (attr
->transit
&& !attr
->transit
->refcnt
) {
868 transit_free(attr
->transit
);
869 attr
->transit
= NULL
;
871 if (attr
->encap_subtlvs
&& !attr
->encap_subtlvs
->refcnt
) {
872 encap_free(attr
->encap_subtlvs
);
873 attr
->encap_subtlvs
= NULL
;
876 if (attr
->vnc_subtlvs
&& !attr
->vnc_subtlvs
->refcnt
) {
877 encap_free(attr
->vnc_subtlvs
);
878 attr
->vnc_subtlvs
= NULL
;
883 /* Implement draft-scudder-idr-optional-transitive behaviour and
884 * avoid resetting sessions for malformed attributes which are
885 * are partial/optional and hence where the error likely was not
886 * introduced by the sending neighbour.
888 static bgp_attr_parse_ret_t
889 bgp_attr_malformed(struct bgp_attr_parser_args
*args
, u_char subcode
,
892 struct peer
*const peer
= args
->peer
;
893 const u_int8_t flags
= args
->flags
;
894 /* startp and length must be special-cased, as whether or not to
895 * send the attribute data with the NOTIFY depends on the error,
896 * the caller therefore signals this with the seperate length argument
898 u_char
*notify_datap
= (length
> 0 ? args
->startp
: NULL
);
900 /* Only relax error handling for eBGP peers */
901 if (peer
->sort
!= BGP_PEER_EBGP
) {
902 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
, subcode
,
903 notify_datap
, length
);
904 return BGP_ATTR_PARSE_ERROR
;
907 /* Adjust the stream getp to the end of the attribute, in case we can
908 * still proceed but the caller hasn't read all the attribute.
910 stream_set_getp(BGP_INPUT(peer
),
911 (args
->startp
- STREAM_DATA(BGP_INPUT(peer
)))
914 switch (args
->type
) {
915 /* where an attribute is relatively inconsequential, e.g. it does not
916 * affect route selection, and can be safely ignored, then any such
917 * attributes which are malformed should just be ignored and the route
918 * processed as normal.
920 case BGP_ATTR_AS4_AGGREGATOR
:
921 case BGP_ATTR_AGGREGATOR
:
922 case BGP_ATTR_ATOMIC_AGGREGATE
:
923 return BGP_ATTR_PARSE_PROCEED
;
925 /* Core attributes, particularly ones which may influence route
926 * selection, should always cause session resets
928 case BGP_ATTR_ORIGIN
:
929 case BGP_ATTR_AS_PATH
:
930 case BGP_ATTR_NEXT_HOP
:
931 case BGP_ATTR_MULTI_EXIT_DISC
:
932 case BGP_ATTR_LOCAL_PREF
:
933 case BGP_ATTR_COMMUNITIES
:
934 case BGP_ATTR_ORIGINATOR_ID
:
935 case BGP_ATTR_CLUSTER_LIST
:
936 case BGP_ATTR_MP_REACH_NLRI
:
937 case BGP_ATTR_MP_UNREACH_NLRI
:
938 case BGP_ATTR_EXT_COMMUNITIES
:
939 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
, subcode
,
940 notify_datap
, length
);
941 return BGP_ATTR_PARSE_ERROR
;
944 /* Partial optional attributes that are malformed should not cause
945 * the whole session to be reset. Instead treat it as a withdrawal
946 * of the routes, if possible.
948 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_TRANS
)
949 && CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)
950 && CHECK_FLAG(flags
, BGP_ATTR_FLAG_PARTIAL
))
951 return BGP_ATTR_PARSE_WITHDRAW
;
953 /* default to reset */
954 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
957 /* Find out what is wrong with the path attribute flag bits and log the error.
958 "Flag bits" here stand for Optional, Transitive and Partial, but not for
959 Extended Length. Checking O/T/P bits at once implies, that the attribute
960 being diagnosed is defined by RFC as either a "well-known" or an "optional,
961 non-transitive" attribute. */
963 bgp_attr_flags_diagnose(struct bgp_attr_parser_args
*args
,
964 u_int8_t desired_flags
/* how RFC says it must be */
968 u_char real_flags
= args
->flags
;
969 const u_int8_t attr_code
= args
->type
;
971 desired_flags
&= ~BGP_ATTR_FLAG_EXTLEN
;
972 real_flags
&= ~BGP_ATTR_FLAG_EXTLEN
;
973 for (i
= 0; i
<= 2; i
++) /* O,T,P, but not E */
974 if (CHECK_FLAG(desired_flags
, attr_flag_str
[i
].key
)
975 != CHECK_FLAG(real_flags
, attr_flag_str
[i
].key
)) {
976 zlog_err("%s attribute must%s be flagged as \"%s\"",
977 lookup_msg(attr_str
, attr_code
, NULL
),
978 CHECK_FLAG(desired_flags
, attr_flag_str
[i
].key
)
981 attr_flag_str
[i
].str
);
986 "Strange, %s called for attr %s, but no problem found with flags"
987 " (real flags 0x%x, desired 0x%x)",
988 __func__
, lookup_msg(attr_str
, attr_code
, NULL
),
989 real_flags
, desired_flags
);
993 /* Required flags for attributes. EXTLEN will be masked off when testing,
994 * as will PARTIAL for optional+transitive attributes.
996 const u_int8_t attr_flags_values
[] = {
997 [BGP_ATTR_ORIGIN
] = BGP_ATTR_FLAG_TRANS
,
998 [BGP_ATTR_AS_PATH
] = BGP_ATTR_FLAG_TRANS
,
999 [BGP_ATTR_NEXT_HOP
] = BGP_ATTR_FLAG_TRANS
,
1000 [BGP_ATTR_MULTI_EXIT_DISC
] = BGP_ATTR_FLAG_OPTIONAL
,
1001 [BGP_ATTR_LOCAL_PREF
] = BGP_ATTR_FLAG_TRANS
,
1002 [BGP_ATTR_ATOMIC_AGGREGATE
] = BGP_ATTR_FLAG_TRANS
,
1003 [BGP_ATTR_AGGREGATOR
] =
1004 BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
,
1005 [BGP_ATTR_COMMUNITIES
] =
1006 BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
,
1007 [BGP_ATTR_ORIGINATOR_ID
] = BGP_ATTR_FLAG_OPTIONAL
,
1008 [BGP_ATTR_CLUSTER_LIST
] = BGP_ATTR_FLAG_OPTIONAL
,
1009 [BGP_ATTR_MP_REACH_NLRI
] = BGP_ATTR_FLAG_OPTIONAL
,
1010 [BGP_ATTR_MP_UNREACH_NLRI
] = BGP_ATTR_FLAG_OPTIONAL
,
1011 [BGP_ATTR_EXT_COMMUNITIES
] =
1012 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1013 [BGP_ATTR_AS4_PATH
] =
1014 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1015 [BGP_ATTR_AS4_AGGREGATOR
] =
1016 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1017 [BGP_ATTR_LARGE_COMMUNITIES
] =
1018 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1019 [BGP_ATTR_PREFIX_SID
] =
1020 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1022 static const size_t attr_flags_values_max
= array_size(attr_flags_values
) - 1;
1024 static int bgp_attr_flag_invalid(struct bgp_attr_parser_args
*args
)
1026 u_int8_t mask
= BGP_ATTR_FLAG_EXTLEN
;
1027 const u_int8_t flags
= args
->flags
;
1028 const u_int8_t attr_code
= args
->type
;
1030 /* there may be attributes we don't know about */
1031 if (attr_code
> attr_flags_values_max
)
1033 if (attr_flags_values
[attr_code
] == 0)
1036 /* RFC4271, "For well-known attributes, the Transitive bit MUST be set
1040 if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL
, flags
)
1041 && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS
, flags
)) {
1043 "%s well-known attributes must have transitive flag set (%x)",
1044 lookup_msg(attr_str
, attr_code
, NULL
), flags
);
1048 /* "For well-known attributes and for optional non-transitive
1050 * the Partial bit MUST be set to 0."
1052 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_PARTIAL
)) {
1053 if (!CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)) {
1055 "%s well-known attribute "
1056 "must NOT have the partial flag set (%x)",
1057 lookup_msg(attr_str
, attr_code
, NULL
), flags
);
1060 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)
1061 && !CHECK_FLAG(flags
, BGP_ATTR_FLAG_TRANS
)) {
1063 "%s optional + transitive attribute "
1064 "must NOT have the partial flag set (%x)",
1065 lookup_msg(attr_str
, attr_code
, NULL
), flags
);
1070 /* Optional transitive attributes may go through speakers that don't
1071 * reocgnise them and set the Partial bit.
1073 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)
1074 && CHECK_FLAG(flags
, BGP_ATTR_FLAG_TRANS
))
1075 SET_FLAG(mask
, BGP_ATTR_FLAG_PARTIAL
);
1077 if ((flags
& ~mask
) == attr_flags_values
[attr_code
])
1080 bgp_attr_flags_diagnose(args
, attr_flags_values
[attr_code
]);
1084 /* Get origin attribute of the update message. */
1085 static bgp_attr_parse_ret_t
bgp_attr_origin(struct bgp_attr_parser_args
*args
)
1087 struct peer
*const peer
= args
->peer
;
1088 struct attr
*const attr
= args
->attr
;
1089 const bgp_size_t length
= args
->length
;
1091 /* If any recognized attribute has Attribute Length that conflicts
1092 with the expected length (based on the attribute type code), then
1093 the Error Subcode is set to Attribute Length Error. The Data
1094 field contains the erroneous attribute (type, length and
1097 zlog_err("Origin attribute length is not one %d", length
);
1098 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1102 /* Fetch origin attribute. */
1103 attr
->origin
= stream_getc(BGP_INPUT(peer
));
1105 /* If the ORIGIN attribute has an undefined value, then the Error
1106 Subcode is set to Invalid Origin Attribute. The Data field
1107 contains the unrecognized attribute (type, length and value). */
1108 if ((attr
->origin
!= BGP_ORIGIN_IGP
) && (attr
->origin
!= BGP_ORIGIN_EGP
)
1109 && (attr
->origin
!= BGP_ORIGIN_INCOMPLETE
)) {
1110 zlog_err("Origin attribute value is invalid %d", attr
->origin
);
1111 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_INVAL_ORIGIN
,
1115 /* Set oring attribute flag. */
1116 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
);
1121 /* Parse AS path information. This function is wrapper of
1123 static int bgp_attr_aspath(struct bgp_attr_parser_args
*args
)
1125 struct attr
*const attr
= args
->attr
;
1126 struct peer
*const peer
= args
->peer
;
1127 const bgp_size_t length
= args
->length
;
1130 * peer with AS4 => will get 4Byte ASnums
1131 * otherwise, will get 16 Bit
1133 attr
->aspath
= aspath_parse(peer
->ibuf
, length
,
1134 CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
));
1136 /* In case of IBGP, length will be zero. */
1137 if (!attr
->aspath
) {
1138 zlog_err("Malformed AS path from %s, length is %d", peer
->host
,
1140 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_MAL_AS_PATH
,
1144 /* Set aspath attribute flag. */
1145 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
);
1147 return BGP_ATTR_PARSE_PROCEED
;
1150 static bgp_attr_parse_ret_t
bgp_attr_aspath_check(struct peer
*const peer
,
1151 struct attr
*const attr
)
1153 /* These checks were part of bgp_attr_aspath, but with
1154 * as4 we should to check aspath things when
1155 * aspath synthesizing with as4_path has already taken place.
1156 * Otherwise we check ASPATH and use the synthesized thing, and that is
1158 * So do the checks later, i.e. here
1160 struct bgp
*bgp
= peer
->bgp
;
1161 struct aspath
*aspath
;
1163 /* Confederation sanity check. */
1164 if ((peer
->sort
== BGP_PEER_CONFED
1165 && !aspath_left_confed_check(attr
->aspath
))
1166 || (peer
->sort
== BGP_PEER_EBGP
1167 && aspath_confed_check(attr
->aspath
))) {
1168 zlog_err("Malformed AS path from %s", peer
->host
);
1169 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
1170 BGP_NOTIFY_UPDATE_MAL_AS_PATH
);
1171 return BGP_ATTR_PARSE_ERROR
;
1174 /* First AS check for EBGP. */
1175 if (bgp
!= NULL
&& bgp_flag_check(bgp
, BGP_FLAG_ENFORCE_FIRST_AS
)) {
1176 if (peer
->sort
== BGP_PEER_EBGP
1177 && !aspath_firstas_check(attr
->aspath
, peer
->as
)) {
1178 zlog_err("%s incorrect first AS (must be %u)",
1179 peer
->host
, peer
->as
);
1180 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
1181 BGP_NOTIFY_UPDATE_MAL_AS_PATH
);
1182 return BGP_ATTR_PARSE_ERROR
;
1186 /* local-as prepend */
1187 if (peer
->change_local_as
1188 && !CHECK_FLAG(peer
->flags
, PEER_FLAG_LOCAL_AS_NO_PREPEND
)) {
1189 aspath
= aspath_dup(attr
->aspath
);
1190 aspath
= aspath_add_seq(aspath
, peer
->change_local_as
);
1191 aspath_unintern(&attr
->aspath
);
1192 attr
->aspath
= aspath_intern(aspath
);
1195 return BGP_ATTR_PARSE_PROCEED
;
1198 /* Parse AS4 path information. This function is another wrapper of
1200 static int bgp_attr_as4_path(struct bgp_attr_parser_args
*args
,
1201 struct aspath
**as4_path
)
1203 struct peer
*const peer
= args
->peer
;
1204 struct attr
*const attr
= args
->attr
;
1205 const bgp_size_t length
= args
->length
;
1207 *as4_path
= aspath_parse(peer
->ibuf
, length
, 1);
1209 /* In case of IBGP, length will be zero. */
1211 zlog_err("Malformed AS4 path from %s, length is %d", peer
->host
,
1213 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_MAL_AS_PATH
,
1217 /* Set aspath attribute flag. */
1218 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH
);
1220 return BGP_ATTR_PARSE_PROCEED
;
1223 /* Nexthop attribute. */
1224 static bgp_attr_parse_ret_t
bgp_attr_nexthop(struct bgp_attr_parser_args
*args
)
1226 struct peer
*const peer
= args
->peer
;
1227 struct attr
*const attr
= args
->attr
;
1228 const bgp_size_t length
= args
->length
;
1230 in_addr_t nexthop_h
, nexthop_n
;
1232 /* Check nexthop attribute length. */
1234 zlog_err("Nexthop attribute length isn't four [%d]", length
);
1236 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1240 /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP
1241 attribute must result in a NOTIFICATION message (this is implemented
1243 At the same time, semantically incorrect NEXT_HOP is more likely to
1245 logged locally (this is implemented somewhere else). The UPDATE
1247 gets ignored in any of these cases. */
1248 nexthop_n
= stream_get_ipv4(peer
->ibuf
);
1249 nexthop_h
= ntohl(nexthop_n
);
1250 if ((IPV4_NET0(nexthop_h
) || IPV4_NET127(nexthop_h
)
1251 || IPV4_CLASS_DE(nexthop_h
))
1254 ALLOW_MARTIANS
)) /* loopbacks may be used in testing */
1256 char buf
[INET_ADDRSTRLEN
];
1257 inet_ntop(AF_INET
, &nexthop_n
, buf
, INET_ADDRSTRLEN
);
1258 zlog_err("Martian nexthop %s", buf
);
1259 return bgp_attr_malformed(
1260 args
, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP
, args
->total
);
1263 attr
->nexthop
.s_addr
= nexthop_n
;
1264 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
);
1266 return BGP_ATTR_PARSE_PROCEED
;
1269 /* MED atrribute. */
1270 static bgp_attr_parse_ret_t
bgp_attr_med(struct bgp_attr_parser_args
*args
)
1272 struct peer
*const peer
= args
->peer
;
1273 struct attr
*const attr
= args
->attr
;
1274 const bgp_size_t length
= args
->length
;
1278 zlog_err("MED attribute length isn't four [%d]", length
);
1280 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1284 attr
->med
= stream_getl(peer
->ibuf
);
1286 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC
);
1288 return BGP_ATTR_PARSE_PROCEED
;
1291 /* Local preference attribute. */
1292 static bgp_attr_parse_ret_t
1293 bgp_attr_local_pref(struct bgp_attr_parser_args
*args
)
1295 struct peer
*const peer
= args
->peer
;
1296 struct attr
*const attr
= args
->attr
;
1297 const bgp_size_t length
= args
->length
;
1301 zlog_err("LOCAL_PREF attribute length isn't 4 [%u]", length
);
1302 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1306 /* If it is contained in an UPDATE message that is received from an
1307 external peer, then this attribute MUST be ignored by the
1308 receiving speaker. */
1309 if (peer
->sort
== BGP_PEER_EBGP
) {
1310 stream_forward_getp(peer
->ibuf
, length
);
1311 return BGP_ATTR_PARSE_PROCEED
;
1314 attr
->local_pref
= stream_getl(peer
->ibuf
);
1316 /* Set the local-pref flag. */
1317 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF
);
1319 return BGP_ATTR_PARSE_PROCEED
;
1322 /* Atomic aggregate. */
1323 static int bgp_attr_atomic(struct bgp_attr_parser_args
*args
)
1325 struct attr
*const attr
= args
->attr
;
1326 const bgp_size_t length
= args
->length
;
1330 zlog_err("ATOMIC_AGGREGATE attribute length isn't 0 [%u]",
1332 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1336 /* Set atomic aggregate flag. */
1337 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
);
1339 return BGP_ATTR_PARSE_PROCEED
;
1342 /* Aggregator attribute */
1343 static int bgp_attr_aggregator(struct bgp_attr_parser_args
*args
)
1345 struct peer
*const peer
= args
->peer
;
1346 struct attr
*const attr
= args
->attr
;
1347 const bgp_size_t length
= args
->length
;
1351 /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */
1352 if (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
))
1355 if (length
!= wantedlen
) {
1356 zlog_err("AGGREGATOR attribute length isn't %u [%u]", wantedlen
,
1358 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1362 if (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
))
1363 attr
->aggregator_as
= stream_getl(peer
->ibuf
);
1365 attr
->aggregator_as
= stream_getw(peer
->ibuf
);
1366 attr
->aggregator_addr
.s_addr
= stream_get_ipv4(peer
->ibuf
);
1368 /* Set atomic aggregate flag. */
1369 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
);
1371 return BGP_ATTR_PARSE_PROCEED
;
1374 /* New Aggregator attribute */
1375 static bgp_attr_parse_ret_t
1376 bgp_attr_as4_aggregator(struct bgp_attr_parser_args
*args
,
1377 as_t
*as4_aggregator_as
,
1378 struct in_addr
*as4_aggregator_addr
)
1380 struct peer
*const peer
= args
->peer
;
1381 struct attr
*const attr
= args
->attr
;
1382 const bgp_size_t length
= args
->length
;
1385 zlog_err("New Aggregator length is not 8 [%d]", length
);
1386 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1390 *as4_aggregator_as
= stream_getl(peer
->ibuf
);
1391 as4_aggregator_addr
->s_addr
= stream_get_ipv4(peer
->ibuf
);
1393 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR
);
1395 return BGP_ATTR_PARSE_PROCEED
;
1398 /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH.
1400 static bgp_attr_parse_ret_t
1401 bgp_attr_munge_as4_attrs(struct peer
*const peer
, struct attr
*const attr
,
1402 struct aspath
*as4_path
, as_t as4_aggregator
,
1403 struct in_addr
*as4_aggregator_addr
)
1405 int ignore_as4_path
= 0;
1406 struct aspath
*newpath
;
1408 if (!attr
->aspath
) {
1409 /* NULL aspath shouldn't be possible as bgp_attr_parse should
1411 * checked that all well-known, mandatory attributes were
1414 * Can only be a problem with peer itself - hard error
1416 return BGP_ATTR_PARSE_ERROR
;
1419 if (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
)) {
1420 /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR
1422 * It is worth a warning though, because the peer really
1423 * should not send them
1425 if (BGP_DEBUG(as4
, AS4
)) {
1426 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH
)))
1427 zlog_debug("[AS4] %s %s AS4_PATH", peer
->host
,
1428 "AS4 capable peer, yet it sent");
1431 & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR
)))
1432 zlog_debug("[AS4] %s %s AS4_AGGREGATOR",
1434 "AS4 capable peer, yet it sent");
1437 return BGP_ATTR_PARSE_PROCEED
;
1440 /* We have a asn16 peer. First, look for AS4_AGGREGATOR
1441 * because that may override AS4_PATH
1443 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR
))) {
1444 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
))) {
1446 * if the as_number in aggregator is not AS_TRANS,
1447 * then AS4_AGGREGATOR and AS4_PATH shall be ignored
1448 * and the Aggregator shall be taken as
1449 * info on the aggregating node, and the AS_PATH
1450 * shall be taken as the AS_PATH
1452 * the Aggregator shall be ignored and the
1453 * AS4_AGGREGATOR shall be taken as the
1454 * Aggregating node and the AS_PATH is to be
1455 * constructed "as in all other cases"
1457 if (attr
->aggregator_as
!= BGP_AS_TRANS
) {
1459 if (BGP_DEBUG(as4
, AS4
))
1461 "[AS4] %s BGP not AS4 capable peer"
1462 " send AGGREGATOR != AS_TRANS and"
1463 " AS4_AGGREGATOR, so ignore"
1464 " AS4_AGGREGATOR and AS4_PATH",
1466 ignore_as4_path
= 1;
1468 /* "New_aggregator shall be taken as aggregator"
1470 attr
->aggregator_as
= as4_aggregator
;
1471 attr
->aggregator_addr
.s_addr
=
1472 as4_aggregator_addr
->s_addr
;
1475 /* We received a AS4_AGGREGATOR but no AGGREGATOR.
1476 * That is bogus - but reading the conditions
1477 * we have to handle AS4_AGGREGATOR as if it were
1478 * AGGREGATOR in that case
1480 if (BGP_DEBUG(as4
, AS4
))
1482 "[AS4] %s BGP not AS4 capable peer send"
1483 " AS4_AGGREGATOR but no AGGREGATOR, will take"
1484 " it as if AGGREGATOR with AS_TRANS had been there",
1486 attr
->aggregator_as
= as4_aggregator
;
1487 /* sweep it under the carpet and simulate a "good"
1489 attr
->flag
|= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
));
1493 /* need to reconcile NEW_AS_PATH and AS_PATH */
1494 if (!ignore_as4_path
1495 && (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH
)))) {
1496 newpath
= aspath_reconcile_as4(attr
->aspath
, as4_path
);
1497 aspath_unintern(&attr
->aspath
);
1498 attr
->aspath
= aspath_intern(newpath
);
1500 return BGP_ATTR_PARSE_PROCEED
;
1503 /* Community attribute. */
1504 static bgp_attr_parse_ret_t
1505 bgp_attr_community(struct bgp_attr_parser_args
*args
)
1507 struct peer
*const peer
= args
->peer
;
1508 struct attr
*const attr
= args
->attr
;
1509 const bgp_size_t length
= args
->length
;
1512 attr
->community
= NULL
;
1513 return BGP_ATTR_PARSE_PROCEED
;
1517 community_parse((u_int32_t
*)stream_pnt(peer
->ibuf
), length
);
1519 /* XXX: fix community_parse to use stream API and remove this */
1520 stream_forward_getp(peer
->ibuf
, length
);
1522 if (!attr
->community
)
1523 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1526 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
);
1528 return BGP_ATTR_PARSE_PROCEED
;
1531 /* Originator ID attribute. */
1532 static bgp_attr_parse_ret_t
1533 bgp_attr_originator_id(struct bgp_attr_parser_args
*args
)
1535 struct peer
*const peer
= args
->peer
;
1536 struct attr
*const attr
= args
->attr
;
1537 const bgp_size_t length
= args
->length
;
1541 zlog_err("Bad originator ID length %d", length
);
1543 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1547 attr
->originator_id
.s_addr
= stream_get_ipv4(peer
->ibuf
);
1549 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID
);
1551 return BGP_ATTR_PARSE_PROCEED
;
1554 /* Cluster list attribute. */
1555 static bgp_attr_parse_ret_t
1556 bgp_attr_cluster_list(struct bgp_attr_parser_args
*args
)
1558 struct peer
*const peer
= args
->peer
;
1559 struct attr
*const attr
= args
->attr
;
1560 const bgp_size_t length
= args
->length
;
1564 zlog_err("Bad cluster list length %d", length
);
1566 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1571 cluster_parse((struct in_addr
*)stream_pnt(peer
->ibuf
), length
);
1573 /* XXX: Fix cluster_parse to use stream API and then remove this */
1574 stream_forward_getp(peer
->ibuf
, length
);
1576 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST
);
1578 return BGP_ATTR_PARSE_PROCEED
;
1581 /* Multiprotocol reachability information parse. */
1582 int bgp_mp_reach_parse(struct bgp_attr_parser_args
*args
,
1583 struct bgp_nlri
*mp_update
)
1587 iana_safi_t pkt_safi
;
1589 bgp_size_t nlri_len
;
1592 struct peer
*const peer
= args
->peer
;
1593 struct attr
*const attr
= args
->attr
;
1594 const bgp_size_t length
= args
->length
;
1596 /* Set end of packet. */
1597 s
= BGP_INPUT(peer
);
1598 start
= stream_get_getp(s
);
1600 /* safe to read statically sized header? */
1601 #define BGP_MP_REACH_MIN_SIZE 5
1602 #define LEN_LEFT (length - (stream_get_getp(s) - start))
1603 if ((length
> STREAM_READABLE(s
)) || (length
< BGP_MP_REACH_MIN_SIZE
)) {
1604 zlog_info("%s: %s sent invalid length, %lu", __func__
,
1605 peer
->host
, (unsigned long)length
);
1606 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1609 /* Load AFI, SAFI. */
1610 pkt_afi
= stream_getw(s
);
1611 pkt_safi
= stream_getc(s
);
1613 /* Convert AFI, SAFI to internal values, check. */
1614 if (bgp_map_afi_safi_iana2int(pkt_afi
, pkt_safi
, &afi
, &safi
)) {
1615 /* Log if AFI or SAFI is unrecognized. This is not an error
1617 * the attribute is otherwise malformed.
1619 if (bgp_debug_update(peer
, NULL
, NULL
, 0))
1621 "%s: MP_REACH received AFI %u or SAFI %u is unrecognized",
1622 peer
->host
, pkt_afi
, pkt_safi
);
1623 return BGP_ATTR_PARSE_ERROR
;
1626 /* Get nexthop length. */
1627 attr
->mp_nexthop_len
= stream_getc(s
);
1629 if (LEN_LEFT
< attr
->mp_nexthop_len
) {
1631 "%s: %s, MP nexthop length, %u, goes past end of attribute",
1632 __func__
, peer
->host
, attr
->mp_nexthop_len
);
1633 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1636 /* Nexthop length check. */
1637 switch (attr
->mp_nexthop_len
) {
1638 case BGP_ATTR_NHLEN_IPV4
:
1639 stream_get(&attr
->mp_nexthop_global_in
, s
, IPV4_MAX_BYTELEN
);
1640 /* Probably needed for RFC 2283 */
1641 if (attr
->nexthop
.s_addr
== 0)
1642 memcpy(&attr
->nexthop
.s_addr
,
1643 &attr
->mp_nexthop_global_in
, IPV4_MAX_BYTELEN
);
1645 case BGP_ATTR_NHLEN_VPNV4
:
1646 stream_getl(s
); /* RD high */
1647 stream_getl(s
); /* RD low */
1648 stream_get(&attr
->mp_nexthop_global_in
, s
, IPV4_MAX_BYTELEN
);
1650 case BGP_ATTR_NHLEN_IPV6_GLOBAL
:
1651 case BGP_ATTR_NHLEN_VPNV6_GLOBAL
:
1652 if (attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_VPNV6_GLOBAL
) {
1653 stream_getl(s
); /* RD high */
1654 stream_getl(s
); /* RD low */
1656 stream_get(&attr
->mp_nexthop_global
, s
, IPV6_MAX_BYTELEN
);
1658 case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
:
1659 case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL
:
1660 if (attr
->mp_nexthop_len
1661 == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL
) {
1662 stream_getl(s
); /* RD high */
1663 stream_getl(s
); /* RD low */
1665 stream_get(&attr
->mp_nexthop_global
, s
, IPV6_MAX_BYTELEN
);
1666 if (attr
->mp_nexthop_len
1667 == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL
) {
1668 stream_getl(s
); /* RD high */
1669 stream_getl(s
); /* RD low */
1671 stream_get(&attr
->mp_nexthop_local
, s
, IPV6_MAX_BYTELEN
);
1672 if (!IN6_IS_ADDR_LINKLOCAL(&attr
->mp_nexthop_local
)) {
1673 char buf1
[INET6_ADDRSTRLEN
];
1674 char buf2
[INET6_ADDRSTRLEN
];
1676 if (bgp_debug_update(peer
, NULL
, NULL
, 1))
1678 "%s rcvd nexthops %s, %s -- ignoring non-LL value",
1681 &attr
->mp_nexthop_global
,
1682 buf1
, INET6_ADDRSTRLEN
),
1684 &attr
->mp_nexthop_local
, buf2
,
1687 attr
->mp_nexthop_len
= IPV6_MAX_BYTELEN
;
1691 zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d",
1692 __func__
, peer
->host
, attr
->mp_nexthop_len
);
1693 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1697 zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__
,
1699 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1704 if ((val
= stream_getc(s
)))
1706 "%s sent non-zero value, %u, for defunct SNPA-length field",
1710 /* must have nrli_len, what is left of the attribute */
1711 nlri_len
= LEN_LEFT
;
1712 if ((!nlri_len
) || (nlri_len
> STREAM_READABLE(s
))) {
1713 zlog_info("%s: (%s) Failed to read NLRI", __func__
, peer
->host
);
1714 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1717 mp_update
->afi
= afi
;
1718 mp_update
->safi
= safi
;
1719 mp_update
->nlri
= stream_pnt(s
);
1720 mp_update
->length
= nlri_len
;
1722 stream_forward_getp(s
, nlri_len
);
1724 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI
);
1726 return BGP_ATTR_PARSE_PROCEED
;
1730 /* Multiprotocol unreachable parse */
1731 int bgp_mp_unreach_parse(struct bgp_attr_parser_args
*args
,
1732 struct bgp_nlri
*mp_withdraw
)
1737 iana_safi_t pkt_safi
;
1739 u_int16_t withdraw_len
;
1740 struct peer
*const peer
= args
->peer
;
1741 struct attr
*const attr
= args
->attr
;
1742 const bgp_size_t length
= args
->length
;
1746 #define BGP_MP_UNREACH_MIN_SIZE 3
1747 if ((length
> STREAM_READABLE(s
)) || (length
< BGP_MP_UNREACH_MIN_SIZE
))
1748 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1750 pkt_afi
= stream_getw(s
);
1751 pkt_safi
= stream_getc(s
);
1753 /* Convert AFI, SAFI to internal values, check. */
1754 if (bgp_map_afi_safi_iana2int(pkt_afi
, pkt_safi
, &afi
, &safi
)) {
1755 /* Log if AFI or SAFI is unrecognized. This is not an error
1757 * the attribute is otherwise malformed.
1759 if (bgp_debug_update(peer
, NULL
, NULL
, 0))
1761 "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized",
1762 peer
->host
, pkt_afi
, pkt_safi
);
1763 return BGP_ATTR_PARSE_ERROR
;
1766 withdraw_len
= length
- BGP_MP_UNREACH_MIN_SIZE
;
1768 mp_withdraw
->afi
= afi
;
1769 mp_withdraw
->safi
= safi
;
1770 mp_withdraw
->nlri
= stream_pnt(s
);
1771 mp_withdraw
->length
= withdraw_len
;
1773 stream_forward_getp(s
, withdraw_len
);
1775 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI
);
1777 return BGP_ATTR_PARSE_PROCEED
;
1780 /* Large Community attribute. */
1781 static bgp_attr_parse_ret_t
1782 bgp_attr_large_community(struct bgp_attr_parser_args
*args
)
1784 struct peer
*const peer
= args
->peer
;
1785 struct attr
*const attr
= args
->attr
;
1786 const bgp_size_t length
= args
->length
;
1789 * Large community follows new attribute format.
1792 attr
->lcommunity
= NULL
;
1793 /* Empty extcomm doesn't seem to be invalid per se */
1794 return BGP_ATTR_PARSE_PROCEED
;
1798 lcommunity_parse((u_int8_t
*)stream_pnt(peer
->ibuf
), length
);
1799 /* XXX: fix ecommunity_parse to use stream API */
1800 stream_forward_getp(peer
->ibuf
, length
);
1802 if (!attr
->lcommunity
)
1803 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1806 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
);
1808 return BGP_ATTR_PARSE_PROCEED
;
1811 /* Extended Community attribute. */
1812 static bgp_attr_parse_ret_t
1813 bgp_attr_ext_communities(struct bgp_attr_parser_args
*args
)
1815 struct peer
*const peer
= args
->peer
;
1816 struct attr
*const attr
= args
->attr
;
1817 const bgp_size_t length
= args
->length
;
1821 attr
->ecommunity
= NULL
;
1822 /* Empty extcomm doesn't seem to be invalid per se */
1823 return BGP_ATTR_PARSE_PROCEED
;
1827 ecommunity_parse((u_int8_t
*)stream_pnt(peer
->ibuf
), length
);
1828 /* XXX: fix ecommunity_parse to use stream API */
1829 stream_forward_getp(peer
->ibuf
, length
);
1831 if (!attr
->ecommunity
)
1832 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1835 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
);
1837 /* Extract MAC mobility sequence number, if any. */
1838 attr
->mm_seqnum
= bgp_attr_mac_mobility_seqnum(attr
, &sticky
);
1839 attr
->sticky
= sticky
;
1841 return BGP_ATTR_PARSE_PROCEED
;
1844 /* Parse Tunnel Encap attribute in an UPDATE */
1845 static int bgp_attr_encap(uint8_t type
, struct peer
*peer
, /* IN */
1846 bgp_size_t length
, /* IN: attr's length field */
1847 struct attr
*attr
, /* IN: caller already allocated */
1848 u_char flag
, /* IN: attr's flags field */
1852 uint16_t tunneltype
= 0;
1854 total
= length
+ (CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
) ? 4 : 3);
1856 if (!CHECK_FLAG(flag
, BGP_ATTR_FLAG_TRANS
)
1857 || !CHECK_FLAG(flag
, BGP_ATTR_FLAG_OPTIONAL
)) {
1859 "Tunnel Encap attribute flag isn't optional and transitive %d",
1861 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
,
1862 BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR
,
1867 if (BGP_ATTR_ENCAP
== type
) {
1868 /* read outer TLV type and length */
1869 uint16_t tlv_length
;
1873 "Tunnel Encap attribute not long enough to contain outer T,L");
1874 bgp_notify_send_with_data(
1875 peer
, BGP_NOTIFY_UPDATE_ERR
,
1876 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
, startp
, total
);
1879 tunneltype
= stream_getw(BGP_INPUT(peer
));
1880 tlv_length
= stream_getw(BGP_INPUT(peer
));
1883 if (tlv_length
!= length
) {
1884 zlog_info("%s: tlv_length(%d) != length(%d)", __func__
,
1885 tlv_length
, length
);
1889 while (length
>= 4) {
1890 uint16_t subtype
= 0;
1891 uint16_t sublength
= 0;
1892 struct bgp_attr_encap_subtlv
*tlv
;
1894 if (BGP_ATTR_ENCAP
== type
) {
1895 subtype
= stream_getc(BGP_INPUT(peer
));
1896 sublength
= stream_getc(BGP_INPUT(peer
));
1900 subtype
= stream_getw(BGP_INPUT(peer
));
1901 sublength
= stream_getw(BGP_INPUT(peer
));
1906 if (sublength
> length
) {
1908 "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
1910 bgp_notify_send_with_data(
1911 peer
, BGP_NOTIFY_UPDATE_ERR
,
1912 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
, startp
, total
);
1916 /* alloc and copy sub-tlv */
1917 /* TBD make sure these are freed when attributes are released */
1918 tlv
= XCALLOC(MTYPE_ENCAP_TLV
,
1919 sizeof(struct bgp_attr_encap_subtlv
) - 1
1921 tlv
->type
= subtype
;
1922 tlv
->length
= sublength
;
1923 stream_get(tlv
->value
, peer
->ibuf
, sublength
);
1924 length
-= sublength
;
1926 /* attach tlv to encap chain */
1927 if (BGP_ATTR_ENCAP
== type
) {
1928 struct bgp_attr_encap_subtlv
*stlv_last
;
1929 for (stlv_last
= attr
->encap_subtlvs
;
1930 stlv_last
&& stlv_last
->next
;
1931 stlv_last
= stlv_last
->next
)
1934 stlv_last
->next
= tlv
;
1936 attr
->encap_subtlvs
= tlv
;
1940 struct bgp_attr_encap_subtlv
*stlv_last
;
1941 for (stlv_last
= attr
->vnc_subtlvs
;
1942 stlv_last
&& stlv_last
->next
;
1943 stlv_last
= stlv_last
->next
)
1946 stlv_last
->next
= tlv
;
1948 attr
->vnc_subtlvs
= tlv
;
1954 if (BGP_ATTR_ENCAP
== type
) {
1955 attr
->encap_tunneltype
= tunneltype
;
1959 /* spurious leftover data */
1961 "Tunnel Encap attribute length is bad: %d leftover octets",
1963 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
,
1964 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1972 /* Prefix SID attribute
1973 * draft-ietf-idr-bgp-prefix-sid-05
1975 static bgp_attr_parse_ret_t
1976 bgp_attr_prefix_sid(struct bgp_attr_parser_args
*args
,
1977 struct bgp_nlri
*mp_update
)
1979 struct peer
*const peer
= args
->peer
;
1980 struct attr
*const attr
= args
->attr
;
1983 u_int32_t label_index
;
1984 struct in6_addr ipv6_sid
;
1985 u_int32_t srgb_base
;
1986 u_int32_t srgb_range
;
1989 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID
);
1991 type
= stream_getc(peer
->ibuf
);
1992 length
= stream_getw(peer
->ibuf
);
1994 if (type
== BGP_PREFIX_SID_LABEL_INDEX
) {
1995 if (length
!= BGP_PREFIX_SID_LABEL_INDEX_LENGTH
) {
1997 "Prefix SID label index length is %d instead of %d",
1998 length
, BGP_PREFIX_SID_LABEL_INDEX_LENGTH
);
1999 return bgp_attr_malformed(
2000 args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2004 /* Ignore flags and reserved */
2005 stream_getc(peer
->ibuf
);
2006 stream_getw(peer
->ibuf
);
2008 /* Fetch the label index and see if it is valid. */
2009 label_index
= stream_getl(peer
->ibuf
);
2010 if (label_index
== BGP_INVALID_LABEL_INDEX
)
2011 return bgp_attr_malformed(
2012 args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
2015 /* Store label index; subsequently, we'll check on
2017 attr
->label_index
= label_index
;
2020 * Ignore the Label index attribute unless received for
2024 if (!mp_update
->length
2025 || mp_update
->safi
!= SAFI_LABELED_UNICAST
)
2026 attr
->label_index
= BGP_INVALID_LABEL_INDEX
;
2029 /* Placeholder code for the IPv6 SID type */
2030 else if (type
== BGP_PREFIX_SID_IPV6
) {
2031 if (length
!= BGP_PREFIX_SID_IPV6_LENGTH
) {
2032 zlog_err("Prefix SID IPv6 length is %d instead of %d",
2033 length
, BGP_PREFIX_SID_IPV6_LENGTH
);
2034 return bgp_attr_malformed(
2035 args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2039 /* Ignore reserved */
2040 stream_getc(peer
->ibuf
);
2041 stream_getw(peer
->ibuf
);
2043 stream_get(&ipv6_sid
, peer
->ibuf
, 16);
2046 /* Placeholder code for the Originator SRGB type */
2047 else if (type
== BGP_PREFIX_SID_ORIGINATOR_SRGB
) {
2049 stream_getw(peer
->ibuf
);
2053 if (length
% BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH
) {
2055 "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ",
2056 length
, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH
);
2057 return bgp_attr_malformed(
2058 args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2062 srgb_count
= length
/ BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH
;
2064 for (int i
= 0; i
< srgb_count
; i
++) {
2065 stream_get(&srgb_base
, peer
->ibuf
, 3);
2066 stream_get(&srgb_range
, peer
->ibuf
, 3);
2070 return BGP_ATTR_PARSE_PROCEED
;
2073 /* BGP unknown attribute treatment. */
2074 static bgp_attr_parse_ret_t
bgp_attr_unknown(struct bgp_attr_parser_args
*args
)
2076 bgp_size_t total
= args
->total
;
2077 struct transit
*transit
;
2078 struct peer
*const peer
= args
->peer
;
2079 struct attr
*const attr
= args
->attr
;
2080 u_char
*const startp
= args
->startp
;
2081 const u_char type
= args
->type
;
2082 const u_char flag
= args
->flags
;
2083 const bgp_size_t length
= args
->length
;
2085 if (bgp_debug_update(peer
, NULL
, NULL
, 1))
2087 "%s Unknown attribute is received (type %d, length %d)",
2088 peer
->host
, type
, length
);
2090 /* Forward read pointer of input stream. */
2091 stream_forward_getp(peer
->ibuf
, length
);
2093 /* If any of the mandatory well-known attributes are not recognized,
2094 then the Error Subcode is set to Unrecognized Well-known
2095 Attribute. The Data field contains the unrecognized attribute
2096 (type, length and value). */
2097 if (!CHECK_FLAG(flag
, BGP_ATTR_FLAG_OPTIONAL
)) {
2098 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_UNREC_ATTR
,
2102 /* Unrecognized non-transitive optional attributes must be quietly
2103 ignored and not passed along to other BGP peers. */
2104 if (!CHECK_FLAG(flag
, BGP_ATTR_FLAG_TRANS
))
2105 return BGP_ATTR_PARSE_PROCEED
;
2107 /* If a path with recognized transitive optional attribute is
2108 accepted and passed along to other BGP peers and the Partial bit
2109 in the Attribute Flags octet is set to 1 by some previous AS, it
2110 is not set back to 0 by the current AS. */
2111 SET_FLAG(*startp
, BGP_ATTR_FLAG_PARTIAL
);
2113 /* Store transitive attribute to the end of attr->transit. */
2115 attr
->transit
= XCALLOC(MTYPE_TRANSIT
, sizeof(struct transit
));
2117 transit
= attr
->transit
;
2120 transit
->val
= XREALLOC(MTYPE_TRANSIT_VAL
, transit
->val
,
2121 transit
->length
+ total
);
2123 transit
->val
= XMALLOC(MTYPE_TRANSIT_VAL
, total
);
2125 memcpy(transit
->val
+ transit
->length
, startp
, total
);
2126 transit
->length
+= total
;
2128 return BGP_ATTR_PARSE_PROCEED
;
2131 /* Well-known attribute check. */
2132 static int bgp_attr_check(struct peer
*peer
, struct attr
*attr
)
2136 /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an
2138 if (CHECK_FLAG(peer
->cap
, PEER_CAP_RESTART_RCV
) && !attr
->flag
)
2139 return BGP_ATTR_PARSE_PROCEED
;
2141 /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required
2142 to carry any other path attributes.", though if MP_REACH_NLRI or NLRI
2143 are present, it should. Check for any other attribute being present
2146 if (attr
->flag
== ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI
))
2147 return BGP_ATTR_PARSE_PROCEED
;
2149 if (!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
)))
2150 type
= BGP_ATTR_ORIGIN
;
2152 if (!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
)))
2153 type
= BGP_ATTR_AS_PATH
;
2155 /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present
2157 * NLRI is empty. We can't easily check NLRI empty here though.
2159 if (!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
))
2160 && !CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI
)))
2161 type
= BGP_ATTR_NEXT_HOP
;
2163 if (peer
->sort
== BGP_PEER_IBGP
2164 && !CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF
)))
2165 type
= BGP_ATTR_LOCAL_PREF
;
2168 zlog_warn("%s Missing well-known attribute %s.", peer
->host
,
2169 lookup_msg(attr_str
, type
, NULL
));
2170 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
,
2171 BGP_NOTIFY_UPDATE_MISS_ATTR
, &type
,
2173 return BGP_ATTR_PARSE_ERROR
;
2175 return BGP_ATTR_PARSE_PROCEED
;
2178 /* Read attribute of update packet. This function is called from
2179 bgp_update_receive() in bgp_packet.c. */
2180 bgp_attr_parse_ret_t
bgp_attr_parse(struct peer
*peer
, struct attr
*attr
,
2181 bgp_size_t size
, struct bgp_nlri
*mp_update
,
2182 struct bgp_nlri
*mp_withdraw
)
2188 u_char
*startp
, *endp
;
2190 u_char seen
[BGP_ATTR_BITMAP_SIZE
];
2191 /* we need the as4_path only until we have synthesized the as_path with
2193 /* same goes for as4_aggregator */
2194 struct aspath
*as4_path
= NULL
;
2195 as_t as4_aggregator
= 0;
2196 struct in_addr as4_aggregator_addr
= {.s_addr
= 0};
2198 /* Initialize bitmap. */
2199 memset(seen
, 0, BGP_ATTR_BITMAP_SIZE
);
2201 /* End pointer of BGP attribute. */
2202 endp
= BGP_INPUT_PNT(peer
) + size
;
2204 /* Get attributes to the end of attribute length. */
2205 while (BGP_INPUT_PNT(peer
) < endp
) {
2206 /* Check remaining length check.*/
2207 if (endp
- BGP_INPUT_PNT(peer
) < BGP_ATTR_MIN_LEN
) {
2208 /* XXX warning: long int format, int arg (arg 5) */
2210 "%s: error BGP attribute length %lu is smaller than min len",
2212 (unsigned long)(endp
2213 - STREAM_PNT(BGP_INPUT(peer
))));
2215 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2216 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2217 return BGP_ATTR_PARSE_ERROR
;
2220 /* Fetch attribute flag and type. */
2221 startp
= BGP_INPUT_PNT(peer
);
2222 /* "The lower-order four bits of the Attribute Flags octet are
2223 unused. They MUST be zero when sent and MUST be ignored when
2225 flag
= 0xF0 & stream_getc(BGP_INPUT(peer
));
2226 type
= stream_getc(BGP_INPUT(peer
));
2228 /* Check whether Extended-Length applies and is in bounds */
2229 if (CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
)
2230 && ((endp
- startp
) < (BGP_ATTR_MIN_LEN
+ 1))) {
2232 "%s: Extended length set, but just %lu bytes of attr header",
2234 (unsigned long)(endp
2235 - STREAM_PNT(BGP_INPUT(peer
))));
2237 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2238 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2239 return BGP_ATTR_PARSE_ERROR
;
2242 /* Check extended attribue length bit. */
2243 if (CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
))
2244 length
= stream_getw(BGP_INPUT(peer
));
2246 length
= stream_getc(BGP_INPUT(peer
));
2248 /* If any attribute appears more than once in the UPDATE
2249 message, then the Error Subcode is set to Malformed Attribute
2252 if (CHECK_BITMAP(seen
, type
)) {
2254 "%s: error BGP attribute type %d appears twice in a message",
2257 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2258 BGP_NOTIFY_UPDATE_MAL_ATTR
);
2259 return BGP_ATTR_PARSE_ERROR
;
2262 /* Set type to bitmap to check duplicate attribute. `type' is
2263 unsigned char so it never overflow bitmap range. */
2265 SET_BITMAP(seen
, type
);
2267 /* Overflow check. */
2268 attr_endp
= BGP_INPUT_PNT(peer
) + length
;
2270 if (attr_endp
> endp
) {
2272 "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p",
2273 peer
->host
, type
, length
, size
, attr_endp
,
2275 bgp_notify_send_with_data(
2276 peer
, BGP_NOTIFY_UPDATE_ERR
,
2277 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
, startp
,
2278 attr_endp
- startp
);
2279 return BGP_ATTR_PARSE_ERROR
;
2282 struct bgp_attr_parser_args attr_args
= {
2289 .total
= attr_endp
- startp
,
2293 /* If any recognized attribute has Attribute Flags that conflict
2294 with the Attribute Type Code, then the Error Subcode is set
2296 Attribute Flags Error. The Data field contains the erroneous
2297 attribute (type, length and value). */
2298 if (bgp_attr_flag_invalid(&attr_args
)) {
2299 bgp_attr_parse_ret_t ret
;
2300 ret
= bgp_attr_malformed(
2301 &attr_args
, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR
,
2303 if (ret
== BGP_ATTR_PARSE_PROCEED
)
2308 /* OK check attribute and store it's value. */
2310 case BGP_ATTR_ORIGIN
:
2311 ret
= bgp_attr_origin(&attr_args
);
2313 case BGP_ATTR_AS_PATH
:
2314 ret
= bgp_attr_aspath(&attr_args
);
2316 case BGP_ATTR_AS4_PATH
:
2317 ret
= bgp_attr_as4_path(&attr_args
, &as4_path
);
2319 case BGP_ATTR_NEXT_HOP
:
2320 ret
= bgp_attr_nexthop(&attr_args
);
2322 case BGP_ATTR_MULTI_EXIT_DISC
:
2323 ret
= bgp_attr_med(&attr_args
);
2325 case BGP_ATTR_LOCAL_PREF
:
2326 ret
= bgp_attr_local_pref(&attr_args
);
2328 case BGP_ATTR_ATOMIC_AGGREGATE
:
2329 ret
= bgp_attr_atomic(&attr_args
);
2331 case BGP_ATTR_AGGREGATOR
:
2332 ret
= bgp_attr_aggregator(&attr_args
);
2334 case BGP_ATTR_AS4_AGGREGATOR
:
2335 ret
= bgp_attr_as4_aggregator(&attr_args
,
2337 &as4_aggregator_addr
);
2339 case BGP_ATTR_COMMUNITIES
:
2340 ret
= bgp_attr_community(&attr_args
);
2342 case BGP_ATTR_LARGE_COMMUNITIES
:
2343 ret
= bgp_attr_large_community(&attr_args
);
2345 case BGP_ATTR_ORIGINATOR_ID
:
2346 ret
= bgp_attr_originator_id(&attr_args
);
2348 case BGP_ATTR_CLUSTER_LIST
:
2349 ret
= bgp_attr_cluster_list(&attr_args
);
2351 case BGP_ATTR_MP_REACH_NLRI
:
2352 ret
= bgp_mp_reach_parse(&attr_args
, mp_update
);
2354 case BGP_ATTR_MP_UNREACH_NLRI
:
2355 ret
= bgp_mp_unreach_parse(&attr_args
, mp_withdraw
);
2357 case BGP_ATTR_EXT_COMMUNITIES
:
2358 ret
= bgp_attr_ext_communities(&attr_args
);
2363 case BGP_ATTR_ENCAP
:
2364 ret
= bgp_attr_encap(type
, peer
, length
, attr
, flag
,
2367 case BGP_ATTR_PREFIX_SID
:
2368 ret
= bgp_attr_prefix_sid(&attr_args
, mp_update
);
2371 ret
= bgp_attr_unknown(&attr_args
);
2375 if (ret
== BGP_ATTR_PARSE_ERROR_NOTIFYPLS
) {
2376 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2377 BGP_NOTIFY_UPDATE_MAL_ATTR
);
2378 ret
= BGP_ATTR_PARSE_ERROR
;
2381 /* If hard error occured immediately return to the caller. */
2382 if (ret
== BGP_ATTR_PARSE_ERROR
) {
2383 zlog_warn("%s: Attribute %s, parse error", peer
->host
,
2384 lookup_msg(attr_str
, type
, NULL
));
2386 aspath_unintern(&as4_path
);
2389 if (ret
== BGP_ATTR_PARSE_WITHDRAW
) {
2392 "%s: Attribute %s, parse error - treating as withdrawal",
2393 peer
->host
, lookup_msg(attr_str
, type
, NULL
));
2395 aspath_unintern(&as4_path
);
2399 /* Check the fetched length. */
2400 if (BGP_INPUT_PNT(peer
) != attr_endp
) {
2401 zlog_warn("%s: BGP attribute %s, fetch error",
2402 peer
->host
, lookup_msg(attr_str
, type
, NULL
));
2403 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2404 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2406 aspath_unintern(&as4_path
);
2407 return BGP_ATTR_PARSE_ERROR
;
2411 /* Check final read pointer is same as end pointer. */
2412 if (BGP_INPUT_PNT(peer
) != endp
) {
2413 zlog_warn("%s: BGP attribute %s, length mismatch", peer
->host
,
2414 lookup_msg(attr_str
, type
, NULL
));
2415 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2416 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2418 aspath_unintern(&as4_path
);
2419 return BGP_ATTR_PARSE_ERROR
;
2422 /* Check all mandatory well-known attributes are present */
2424 bgp_attr_parse_ret_t ret
;
2425 if ((ret
= bgp_attr_check(peer
, attr
)) < 0) {
2427 aspath_unintern(&as4_path
);
2433 * At this place we can see whether we got AS4_PATH and/or
2434 * AS4_AGGREGATOR from a 16Bit peer and act accordingly.
2435 * We can not do this before we've read all attributes because
2436 * the as4 handling does not say whether AS4_PATH has to be sent
2437 * after AS_PATH or not - and when AS4_AGGREGATOR will be send
2438 * in relationship to AGGREGATOR.
2439 * So, to be defensive, we are not relying on any order and read
2440 * all attributes first, including these 32bit ones, and now,
2441 * afterwards, we look what and if something is to be done for as4.
2443 * It is possible to not have AS_PATH, e.g. GR EoR and sole
2446 /* actually... this doesn't ever return failure currently, but
2447 * better safe than sorry */
2448 if (CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
))
2449 && bgp_attr_munge_as4_attrs(peer
, attr
, as4_path
, as4_aggregator
,
2450 &as4_aggregator_addr
)) {
2451 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2452 BGP_NOTIFY_UPDATE_MAL_ATTR
);
2454 aspath_unintern(&as4_path
);
2455 return BGP_ATTR_PARSE_ERROR
;
2458 /* At this stage, we have done all fiddling with as4, and the
2459 * resulting info is in attr->aggregator resp. attr->aspath
2460 * so we can chuck as4_aggregator and as4_path alltogether in
2461 * order to save memory
2464 aspath_unintern(&as4_path
); /* unintern - it is in the hash */
2465 /* The flag that we got this is still there, but that does not
2470 * The "rest" of the code does nothing with as4_aggregator.
2471 * there is no memory attached specifically which is not part
2473 * so ignoring just means do nothing.
2476 * Finally do the checks on the aspath we did not do yet
2477 * because we waited for a potentially synthesized aspath.
2479 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
))) {
2480 ret
= bgp_attr_aspath_check(peer
, attr
);
2481 if (ret
!= BGP_ATTR_PARSE_PROCEED
)
2484 /* Finally intern unknown attribute. */
2486 attr
->transit
= transit_intern(attr
->transit
);
2487 if (attr
->encap_subtlvs
)
2488 attr
->encap_subtlvs
=
2489 encap_intern(attr
->encap_subtlvs
, ENCAP_SUBTLV_TYPE
);
2491 if (attr
->vnc_subtlvs
)
2493 encap_intern(attr
->vnc_subtlvs
, VNC_SUBTLV_TYPE
);
2496 return BGP_ATTR_PARSE_PROCEED
;
2499 size_t bgp_packet_mpattr_start(struct stream
*s
, struct peer
*peer
, afi_t afi
,
2500 safi_t safi
, struct bpacket_attr_vec_arr
*vecarr
,
2505 iana_safi_t pkt_safi
;
2508 /* Set extended bit always to encode the attribute length as 2 bytes */
2509 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_EXTLEN
);
2510 stream_putc(s
, BGP_ATTR_MP_REACH_NLRI
);
2511 sizep
= stream_get_endp(s
);
2512 stream_putw(s
, 0); /* Marker: Attribute length. */
2515 /* Convert AFI, SAFI to values for packet. */
2516 bgp_map_afi_safi_int2iana(afi
, safi
, &pkt_afi
, &pkt_safi
);
2518 stream_putw(s
, pkt_afi
); /* AFI */
2519 stream_putc(s
, pkt_safi
); /* SAFI */
2523 && (safi
== SAFI_UNICAST
|| safi
== SAFI_LABELED_UNICAST
))
2524 nh_afi
= peer_cap_enhe(peer
, afi
, safi
) ? AFI_IP6
: AFI_IP
;
2526 nh_afi
= BGP_NEXTHOP_AFI_FROM_NHLEN(attr
->mp_nexthop_len
);
2529 bpacket_attr_vec_arr_set_vec(vecarr
, BGP_ATTR_VEC_NH
, s
, attr
);
2534 case SAFI_MULTICAST
:
2535 case SAFI_LABELED_UNICAST
:
2537 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
2541 stream_putl(s
, 0); /* RD = 0, per RFC */
2543 stream_put(s
, &attr
->mp_nexthop_global_in
, 4);
2548 stream_put(s
, &attr
->mp_nexthop_global_in
, 4);
2557 case SAFI_MULTICAST
:
2558 case SAFI_LABELED_UNICAST
:
2560 if (attr
->mp_nexthop_len
2561 == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
) {
2563 BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
);
2564 stream_put(s
, &attr
->mp_nexthop_global
,
2566 stream_put(s
, &attr
->mp_nexthop_local
,
2569 stream_putc(s
, IPV6_MAX_BYTELEN
);
2570 stream_put(s
, &attr
->mp_nexthop_global
,
2574 case SAFI_MPLS_VPN
: {
2575 if (attr
->mp_nexthop_len
2576 == BGP_ATTR_NHLEN_IPV6_GLOBAL
) {
2578 stream_putl(s
, 0); /* RD = 0, per RFC */
2580 stream_put(s
, &attr
->mp_nexthop_global
,
2582 } else if (attr
->mp_nexthop_len
2583 == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
) {
2585 stream_putl(s
, 0); /* RD = 0, per RFC */
2587 stream_put(s
, &attr
->mp_nexthop_global
,
2589 stream_putl(s
, 0); /* RD = 0, per RFC */
2591 stream_put(s
, &attr
->mp_nexthop_local
,
2596 stream_putc(s
, IPV6_MAX_BYTELEN
);
2597 stream_put(s
, &attr
->mp_nexthop_global
,
2606 "Bad nexthop when sening to %s, AFI %u SAFI %u nhlen %d",
2607 peer
->host
, afi
, safi
, attr
->mp_nexthop_len
);
2616 void bgp_packet_mpattr_prefix(struct stream
*s
, afi_t afi
, safi_t safi
,
2617 struct prefix
*p
, struct prefix_rd
*prd
,
2618 mpls_label_t
*label
, int addpath_encode
,
2619 u_int32_t addpath_tx_id
, struct attr
*attr
)
2621 if (safi
== SAFI_MPLS_VPN
) {
2623 stream_putl(s
, addpath_tx_id
);
2624 /* Label, RD, Prefix write. */
2625 stream_putc(s
, p
->prefixlen
+ 88);
2626 stream_put(s
, label
, BGP_LABEL_BYTES
);
2627 stream_put(s
, prd
->val
, 8);
2628 stream_put(s
, &p
->u
.prefix
, PSIZE(p
->prefixlen
));
2629 } else if (afi
== AFI_L2VPN
&& safi
== SAFI_EVPN
) {
2630 /* EVPN prefix - contents depend on type */
2631 bgp_evpn_encode_prefix(s
, p
, prd
, label
, attr
, addpath_encode
,
2633 } else if (safi
== SAFI_LABELED_UNICAST
) {
2634 /* Prefix write with label. */
2635 stream_put_labeled_prefix(s
, p
, label
);
2637 stream_put_prefix_addpath(s
, p
, addpath_encode
, addpath_tx_id
);
2640 size_t bgp_packet_mpattr_prefix_size(afi_t afi
, safi_t safi
, struct prefix
*p
)
2642 int size
= PSIZE(p
->prefixlen
);
2643 if (safi
== SAFI_MPLS_VPN
)
2645 else if (afi
== AFI_L2VPN
&& safi
== SAFI_EVPN
)
2646 size
+= 232; // TODO: Maximum possible for type-2, type-3 and
2652 * Encodes the tunnel encapsulation attribute,
2653 * and with ENABLE_BGP_VNC the VNC attribute which uses
2654 * almost the same TLV format
2656 static void bgp_packet_mpattr_tea(struct bgp
*bgp
, struct peer
*peer
,
2657 struct stream
*s
, struct attr
*attr
,
2660 unsigned int attrlenfield
= 0;
2661 unsigned int attrhdrlen
= 0;
2662 struct bgp_attr_encap_subtlv
*subtlvs
;
2663 struct bgp_attr_encap_subtlv
*st
;
2664 const char *attrname
;
2666 if (!attr
|| (attrtype
== BGP_ATTR_ENCAP
2667 && (!attr
->encap_tunneltype
2668 || attr
->encap_tunneltype
== BGP_ENCAP_TYPE_MPLS
)))
2672 case BGP_ATTR_ENCAP
:
2673 attrname
= "Tunnel Encap";
2674 subtlvs
= attr
->encap_subtlvs
;
2675 if (subtlvs
== NULL
) /* nothing to do */
2678 * The tunnel encap attr has an "outer" tlv.
2680 * L = total length of subtlvs,
2681 * V = concatenated subtlvs.
2683 attrlenfield
= 2 + 2; /* T + L */
2684 attrhdrlen
= 1 + 1; /* subTLV T + L */
2690 subtlvs
= attr
->vnc_subtlvs
;
2691 if (subtlvs
== NULL
) /* nothing to do */
2693 attrlenfield
= 0; /* no outer T + L */
2694 attrhdrlen
= 2 + 2; /* subTLV T + L */
2702 /* compute attr length */
2703 for (st
= subtlvs
; st
; st
= st
->next
) {
2704 attrlenfield
+= (attrhdrlen
+ st
->length
);
2707 if (attrlenfield
> 0xffff) {
2708 zlog_info("%s attribute is too long (length=%d), can't send it",
2709 attrname
, attrlenfield
);
2713 if (attrlenfield
> 0xff) {
2714 /* 2-octet length field */
2715 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
2716 | BGP_ATTR_FLAG_EXTLEN
);
2717 stream_putc(s
, attrtype
);
2718 stream_putw(s
, attrlenfield
& 0xffff);
2720 /* 1-octet length field */
2721 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
);
2722 stream_putc(s
, attrtype
);
2723 stream_putc(s
, attrlenfield
& 0xff);
2726 if (attrtype
== BGP_ATTR_ENCAP
) {
2727 /* write outer T+L */
2728 stream_putw(s
, attr
->encap_tunneltype
);
2729 stream_putw(s
, attrlenfield
- 4);
2732 /* write each sub-tlv */
2733 for (st
= subtlvs
; st
; st
= st
->next
) {
2734 if (attrtype
== BGP_ATTR_ENCAP
) {
2735 stream_putc(s
, st
->type
);
2736 stream_putc(s
, st
->length
);
2739 stream_putw(s
, st
->type
);
2740 stream_putw(s
, st
->length
);
2743 stream_put(s
, st
->value
, st
->length
);
2747 void bgp_packet_mpattr_end(struct stream
*s
, size_t sizep
)
2749 /* Set MP attribute length. Don't count the (2) bytes used to encode
2751 stream_putw_at(s
, sizep
, (stream_get_endp(s
) - sizep
) - 2);
2754 /* Make attribute packet. */
2755 bgp_size_t
bgp_packet_attribute(struct bgp
*bgp
, struct peer
*peer
,
2756 struct stream
*s
, struct attr
*attr
,
2757 struct bpacket_attr_vec_arr
*vecarr
,
2758 struct prefix
*p
, afi_t afi
, safi_t safi
,
2759 struct peer
*from
, struct prefix_rd
*prd
,
2760 mpls_label_t
*label
, int addpath_encode
,
2761 u_int32_t addpath_tx_id
)
2764 size_t aspath_sizep
;
2765 struct aspath
*aspath
;
2766 int send_as4_path
= 0;
2767 int send_as4_aggregator
= 0;
2768 int use32bit
= (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
)) ? 1 : 0;
2773 /* Remember current pointer. */
2774 cp
= stream_get_endp(s
);
2777 && !((afi
== AFI_IP
&& safi
== SAFI_UNICAST
)
2778 && !peer_cap_enhe(peer
, afi
, safi
))) {
2779 size_t mpattrlen_pos
= 0;
2781 mpattrlen_pos
= bgp_packet_mpattr_start(s
, peer
, afi
, safi
,
2783 bgp_packet_mpattr_prefix(s
, afi
, safi
, p
, prd
, label
,
2784 addpath_encode
, addpath_tx_id
, attr
);
2785 bgp_packet_mpattr_end(s
, mpattrlen_pos
);
2788 /* Origin attribute. */
2789 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
2790 stream_putc(s
, BGP_ATTR_ORIGIN
);
2792 stream_putc(s
, attr
->origin
);
2794 /* AS path attribute. */
2796 /* If remote-peer is EBGP */
2797 if (peer
->sort
== BGP_PEER_EBGP
2798 && (!CHECK_FLAG(peer
->af_flags
[afi
][safi
],
2799 PEER_FLAG_AS_PATH_UNCHANGED
)
2800 || attr
->aspath
->segments
== NULL
)
2801 && (!CHECK_FLAG(peer
->af_flags
[afi
][safi
],
2802 PEER_FLAG_RSERVER_CLIENT
))) {
2803 aspath
= aspath_dup(attr
->aspath
);
2805 /* Even though we may not be configured for confederations we
2807 * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */
2808 aspath
= aspath_delete_confed_seq(aspath
);
2810 if (CHECK_FLAG(bgp
->config
, BGP_CONFIG_CONFEDERATION
)) {
2811 /* Stuff our path CONFED_ID on the front */
2812 aspath
= aspath_add_seq(aspath
, bgp
->confed_id
);
2814 if (peer
->change_local_as
) {
2815 /* If replace-as is specified, we only use the
2816 change_local_as when
2817 advertising routes. */
2820 PEER_FLAG_LOCAL_AS_REPLACE_AS
)) {
2821 aspath
= aspath_add_seq(aspath
,
2824 aspath
= aspath_add_seq(aspath
,
2825 peer
->change_local_as
);
2827 aspath
= aspath_add_seq(aspath
, peer
->local_as
);
2830 } else if (peer
->sort
== BGP_PEER_CONFED
) {
2831 /* A confed member, so we need to do the AS_CONFED_SEQUENCE
2833 aspath
= aspath_dup(attr
->aspath
);
2834 aspath
= aspath_add_confed_seq(aspath
, peer
->local_as
);
2836 aspath
= attr
->aspath
;
2838 /* If peer is not AS4 capable, then:
2839 * - send the created AS_PATH out as AS4_PATH (optional, transitive),
2840 * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path
2842 * types are in it (i.e. exclude them if they are there)
2843 * AND do this only if there is at least one asnum > 65535 in the
2845 * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and
2847 * all ASnums > 65535 to BGP_AS_TRANS
2850 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_EXTLEN
);
2851 stream_putc(s
, BGP_ATTR_AS_PATH
);
2852 aspath_sizep
= stream_get_endp(s
);
2854 stream_putw_at(s
, aspath_sizep
, aspath_put(s
, aspath
, use32bit
));
2856 /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs
2859 if (!use32bit
&& aspath_has_as4(aspath
))
2861 1; /* we'll do this later, at the correct place */
2863 /* Nexthop attribute. */
2864 if (afi
== AFI_IP
&& safi
== SAFI_UNICAST
2865 && !peer_cap_enhe(peer
, afi
, safi
)) {
2866 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
)) {
2867 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
2868 stream_putc(s
, BGP_ATTR_NEXT_HOP
);
2869 bpacket_attr_vec_arr_set_vec(vecarr
, BGP_ATTR_VEC_NH
, s
,
2872 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
2873 } else if (peer_cap_enhe(from
, afi
, safi
)) {
2875 * Likely this is the case when an IPv4 prefix was
2877 * Extended Next-hop capability and now being advertised
2880 * Setting the mandatory (ipv4) next-hop attribute here
2882 * implicit next-hop self with correct (ipv4 address
2885 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
2886 stream_putc(s
, BGP_ATTR_NEXT_HOP
);
2887 bpacket_attr_vec_arr_set_vec(vecarr
, BGP_ATTR_VEC_NH
, s
,
2890 stream_put_ipv4(s
, 0);
2894 /* MED attribute. */
2895 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC
)
2896 || bgp
->maxmed_active
) {
2897 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
2898 stream_putc(s
, BGP_ATTR_MULTI_EXIT_DISC
);
2900 stream_putl(s
, (bgp
->maxmed_active
? bgp
->maxmed_value
2904 /* Local preference. */
2905 if (peer
->sort
== BGP_PEER_IBGP
|| peer
->sort
== BGP_PEER_CONFED
) {
2906 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
2907 stream_putc(s
, BGP_ATTR_LOCAL_PREF
);
2909 stream_putl(s
, attr
->local_pref
);
2912 /* Atomic aggregate. */
2913 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
)) {
2914 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
2915 stream_putc(s
, BGP_ATTR_ATOMIC_AGGREGATE
);
2920 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
)) {
2921 /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */
2922 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
2923 stream_putc(s
, BGP_ATTR_AGGREGATOR
);
2926 /* AS4 capable peer */
2928 stream_putl(s
, attr
->aggregator_as
);
2930 /* 2-byte AS peer */
2933 /* Is ASN representable in 2-bytes? Or must AS_TRANS be
2935 if (attr
->aggregator_as
> 65535) {
2936 stream_putw(s
, BGP_AS_TRANS
);
2938 /* we have to send AS4_AGGREGATOR, too.
2939 * we'll do that later in order to send
2940 * attributes in ascending
2943 send_as4_aggregator
= 1;
2945 stream_putw(s
, (u_int16_t
)attr
->aggregator_as
);
2947 stream_put_ipv4(s
, attr
->aggregator_addr
.s_addr
);
2950 /* Community attribute. */
2951 if (CHECK_FLAG(peer
->af_flags
[afi
][safi
], PEER_FLAG_SEND_COMMUNITY
)
2952 && (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
))) {
2953 if (attr
->community
->size
* 4 > 255) {
2954 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
2955 | BGP_ATTR_FLAG_TRANS
2956 | BGP_ATTR_FLAG_EXTLEN
);
2957 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
2958 stream_putw(s
, attr
->community
->size
* 4);
2960 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
2961 | BGP_ATTR_FLAG_TRANS
);
2962 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
2963 stream_putc(s
, attr
->community
->size
* 4);
2965 stream_put(s
, attr
->community
->val
, attr
->community
->size
* 4);
2969 * Large Community attribute.
2971 if (CHECK_FLAG(peer
->af_flags
[afi
][safi
],
2972 PEER_FLAG_SEND_LARGE_COMMUNITY
)
2973 && (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
))) {
2974 if (lcom_length(attr
->lcommunity
) > 255) {
2975 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
2976 | BGP_ATTR_FLAG_TRANS
2977 | BGP_ATTR_FLAG_EXTLEN
);
2978 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
2979 stream_putw(s
, lcom_length(attr
->lcommunity
));
2981 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
2982 | BGP_ATTR_FLAG_TRANS
);
2983 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
2984 stream_putc(s
, lcom_length(attr
->lcommunity
));
2986 stream_put(s
, attr
->lcommunity
->val
,
2987 lcom_length(attr
->lcommunity
));
2990 /* Route Reflector. */
2991 if (peer
->sort
== BGP_PEER_IBGP
&& from
2992 && from
->sort
== BGP_PEER_IBGP
) {
2993 /* Originator ID. */
2994 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
2995 stream_putc(s
, BGP_ATTR_ORIGINATOR_ID
);
2998 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID
))
2999 stream_put_in_addr(s
, &attr
->originator_id
);
3001 stream_put_in_addr(s
, &from
->remote_id
);
3004 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3005 stream_putc(s
, BGP_ATTR_CLUSTER_LIST
);
3007 if (attr
->cluster
) {
3008 stream_putc(s
, attr
->cluster
->length
+ 4);
3009 /* If this peer configuration's parent BGP has
3011 if (bgp
->config
& BGP_CONFIG_CLUSTER_ID
)
3012 stream_put_in_addr(s
, &bgp
->cluster_id
);
3014 stream_put_in_addr(s
, &bgp
->router_id
);
3015 stream_put(s
, attr
->cluster
->list
,
3016 attr
->cluster
->length
);
3019 /* If this peer configuration's parent BGP has
3021 if (bgp
->config
& BGP_CONFIG_CLUSTER_ID
)
3022 stream_put_in_addr(s
, &bgp
->cluster_id
);
3024 stream_put_in_addr(s
, &bgp
->router_id
);
3028 /* Extended Communities attribute. */
3029 if (CHECK_FLAG(peer
->af_flags
[afi
][safi
], PEER_FLAG_SEND_EXT_COMMUNITY
)
3030 && (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
))) {
3031 if (peer
->sort
== BGP_PEER_IBGP
3032 || peer
->sort
== BGP_PEER_CONFED
) {
3033 if (attr
->ecommunity
->size
* 8 > 255) {
3034 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3035 | BGP_ATTR_FLAG_TRANS
3036 | BGP_ATTR_FLAG_EXTLEN
);
3037 stream_putc(s
, BGP_ATTR_EXT_COMMUNITIES
);
3038 stream_putw(s
, attr
->ecommunity
->size
* 8);
3040 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3041 | BGP_ATTR_FLAG_TRANS
);
3042 stream_putc(s
, BGP_ATTR_EXT_COMMUNITIES
);
3043 stream_putc(s
, attr
->ecommunity
->size
* 8);
3045 stream_put(s
, attr
->ecommunity
->val
,
3046 attr
->ecommunity
->size
* 8);
3050 int ecom_tr_size
= 0;
3053 for (i
= 0; i
< attr
->ecommunity
->size
; i
++) {
3054 pnt
= attr
->ecommunity
->val
+ (i
* 8);
3057 if (CHECK_FLAG(tbit
,
3058 ECOMMUNITY_FLAG_NON_TRANSITIVE
))
3065 if (ecom_tr_size
* 8 > 255) {
3068 BGP_ATTR_FLAG_OPTIONAL
3069 | BGP_ATTR_FLAG_TRANS
3070 | BGP_ATTR_FLAG_EXTLEN
);
3072 BGP_ATTR_EXT_COMMUNITIES
);
3073 stream_putw(s
, ecom_tr_size
* 8);
3077 BGP_ATTR_FLAG_OPTIONAL
3078 | BGP_ATTR_FLAG_TRANS
);
3080 BGP_ATTR_EXT_COMMUNITIES
);
3081 stream_putc(s
, ecom_tr_size
* 8);
3084 for (i
= 0; i
< attr
->ecommunity
->size
; i
++) {
3085 pnt
= attr
->ecommunity
->val
+ (i
* 8);
3090 ECOMMUNITY_FLAG_NON_TRANSITIVE
))
3093 stream_put(s
, pnt
, 8);
3099 /* Label index attribute. */
3100 if (safi
== SAFI_LABELED_UNICAST
) {
3101 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID
)) {
3102 u_int32_t label_index
;
3104 label_index
= attr
->label_index
;
3106 if (label_index
!= BGP_INVALID_LABEL_INDEX
) {
3107 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3108 | BGP_ATTR_FLAG_TRANS
);
3109 stream_putc(s
, BGP_ATTR_PREFIX_SID
);
3111 stream_putc(s
, BGP_PREFIX_SID_LABEL_INDEX
);
3113 BGP_PREFIX_SID_LABEL_INDEX_LENGTH
);
3114 stream_putc(s
, 0); // reserved
3115 stream_putw(s
, 0); // flags
3116 stream_putl(s
, label_index
);
3121 if (send_as4_path
) {
3122 /* If the peer is NOT As4 capable, AND */
3123 /* there are ASnums > 65535 in path THEN
3124 * give out AS4_PATH */
3126 /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET
3128 * Hm, I wonder... confederation things *should* only be at
3129 * the beginning of an aspath, right? Then we should use
3130 * aspath_delete_confed_seq for this, because it is already
3132 * Folks, talk to me: what is reasonable here!?
3134 aspath
= aspath_delete_confed_seq(aspath
);
3136 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
3137 | BGP_ATTR_FLAG_EXTLEN
);
3138 stream_putc(s
, BGP_ATTR_AS4_PATH
);
3139 aspath_sizep
= stream_get_endp(s
);
3141 stream_putw_at(s
, aspath_sizep
, aspath_put(s
, aspath
, 1));
3144 if (aspath
!= attr
->aspath
)
3145 aspath_free(aspath
);
3147 if (send_as4_aggregator
) {
3148 /* send AS4_AGGREGATOR, at this place */
3149 /* this section of code moved here in order to ensure the
3151 * *ascending* order of attributes
3153 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
3154 stream_putc(s
, BGP_ATTR_AS4_AGGREGATOR
);
3156 stream_putl(s
, attr
->aggregator_as
);
3157 stream_put_ipv4(s
, attr
->aggregator_addr
.s_addr
);
3160 if (((afi
== AFI_IP
|| afi
== AFI_IP6
)
3161 && (safi
== SAFI_ENCAP
|| safi
== SAFI_MPLS_VPN
))
3162 || (afi
== AFI_L2VPN
&& safi
== SAFI_EVPN
)) {
3163 /* Tunnel Encap attribute */
3164 bgp_packet_mpattr_tea(bgp
, peer
, s
, attr
, BGP_ATTR_ENCAP
);
3168 bgp_packet_mpattr_tea(bgp
, peer
, s
, attr
, BGP_ATTR_VNC
);
3172 /* Unknown transit attribute. */
3174 stream_put(s
, attr
->transit
->val
, attr
->transit
->length
);
3176 /* Return total size of attribute. */
3177 return stream_get_endp(s
) - cp
;
3180 size_t bgp_packet_mpunreach_start(struct stream
*s
, afi_t afi
, safi_t safi
)
3182 unsigned long attrlen_pnt
;
3184 iana_safi_t pkt_safi
;
3186 /* Set extended bit always to encode the attribute length as 2 bytes */
3187 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_EXTLEN
);
3188 stream_putc(s
, BGP_ATTR_MP_UNREACH_NLRI
);
3190 attrlen_pnt
= stream_get_endp(s
);
3191 stream_putw(s
, 0); /* Length of this attribute. */
3193 /* Convert AFI, SAFI to values for packet. */
3194 bgp_map_afi_safi_int2iana(afi
, safi
, &pkt_afi
, &pkt_safi
);
3196 stream_putw(s
, pkt_afi
);
3197 stream_putc(s
, pkt_safi
);
3202 void bgp_packet_mpunreach_prefix(struct stream
*s
, struct prefix
*p
, afi_t afi
,
3203 safi_t safi
, struct prefix_rd
*prd
,
3204 mpls_label_t
*label
, int addpath_encode
,
3205 u_int32_t addpath_tx_id
, struct attr
*attr
)
3207 u_char wlabel
[3] = {0x80, 0x00, 0x00};
3209 if (safi
== SAFI_LABELED_UNICAST
)
3210 label
= (mpls_label_t
*)wlabel
;
3212 return bgp_packet_mpattr_prefix(s
, afi
, safi
, p
, prd
, label
,
3213 addpath_encode
, addpath_tx_id
, attr
);
3216 void bgp_packet_mpunreach_end(struct stream
*s
, size_t attrlen_pnt
)
3218 bgp_packet_mpattr_end(s
, attrlen_pnt
);
3221 /* Initialization of attribute. */
3222 void bgp_attr_init(void)
3234 void bgp_attr_finish(void)
3239 ecommunity_finish();
3240 lcommunity_finish();
3246 /* Make attribute packet. */
3247 void bgp_dump_routes_attr(struct stream
*s
, struct attr
*attr
,
3248 struct prefix
*prefix
)
3253 struct aspath
*aspath
;
3254 int addpath_encode
= 0;
3255 u_int32_t addpath_tx_id
= 0;
3257 /* Remember current pointer. */
3258 cp
= stream_get_endp(s
);
3260 /* Place holder of length. */
3263 /* Origin attribute. */
3264 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3265 stream_putc(s
, BGP_ATTR_ORIGIN
);
3267 stream_putc(s
, attr
->origin
);
3269 aspath
= attr
->aspath
;
3271 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_EXTLEN
);
3272 stream_putc(s
, BGP_ATTR_AS_PATH
);
3273 aspath_lenp
= stream_get_endp(s
);
3276 stream_putw_at(s
, aspath_lenp
, aspath_put(s
, aspath
, 1));
3278 /* Nexthop attribute. */
3279 /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */
3280 if (prefix
!= NULL
&& prefix
->family
!= AF_INET6
) {
3281 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3282 stream_putc(s
, BGP_ATTR_NEXT_HOP
);
3284 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
3287 /* MED attribute. */
3288 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC
)) {
3289 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3290 stream_putc(s
, BGP_ATTR_MULTI_EXIT_DISC
);
3292 stream_putl(s
, attr
->med
);
3295 /* Local preference. */
3296 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF
)) {
3297 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3298 stream_putc(s
, BGP_ATTR_LOCAL_PREF
);
3300 stream_putl(s
, attr
->local_pref
);
3303 /* Atomic aggregate. */
3304 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
)) {
3305 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3306 stream_putc(s
, BGP_ATTR_ATOMIC_AGGREGATE
);
3311 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
)) {
3312 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
3313 stream_putc(s
, BGP_ATTR_AGGREGATOR
);
3315 stream_putl(s
, attr
->aggregator_as
);
3316 stream_put_ipv4(s
, attr
->aggregator_addr
.s_addr
);
3319 /* Community attribute. */
3320 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
)) {
3321 if (attr
->community
->size
* 4 > 255) {
3322 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3323 | BGP_ATTR_FLAG_TRANS
3324 | BGP_ATTR_FLAG_EXTLEN
);
3325 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
3326 stream_putw(s
, attr
->community
->size
* 4);
3328 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3329 | BGP_ATTR_FLAG_TRANS
);
3330 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
3331 stream_putc(s
, attr
->community
->size
* 4);
3333 stream_put(s
, attr
->community
->val
, attr
->community
->size
* 4);
3336 /* Large Community attribute. */
3337 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
)) {
3338 if (lcom_length(attr
->lcommunity
) > 255) {
3339 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3340 | BGP_ATTR_FLAG_TRANS
3341 | BGP_ATTR_FLAG_EXTLEN
);
3342 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
3343 stream_putw(s
, lcom_length(attr
->lcommunity
));
3345 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3346 | BGP_ATTR_FLAG_TRANS
);
3347 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
3348 stream_putc(s
, lcom_length(attr
->lcommunity
));
3351 stream_put(s
, attr
->lcommunity
->val
, lcom_length(attr
->lcommunity
));
3354 /* Add a MP_NLRI attribute to dump the IPv6 next hop */
3355 if (prefix
!= NULL
&& prefix
->family
== AF_INET6
3356 && (attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL
3357 || attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
)) {
3360 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3361 stream_putc(s
, BGP_ATTR_MP_REACH_NLRI
);
3362 sizep
= stream_get_endp(s
);
3365 stream_putc(s
, 0); /* Marker: Attribute length. */
3366 stream_putw(s
, AFI_IP6
); /* AFI */
3367 stream_putc(s
, SAFI_UNICAST
); /* SAFI */
3370 stream_putc(s
, attr
->mp_nexthop_len
);
3371 stream_put(s
, &attr
->mp_nexthop_global
, IPV6_MAX_BYTELEN
);
3372 if (attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
)
3373 stream_put(s
, &attr
->mp_nexthop_local
,
3380 stream_put_prefix_addpath(s
, prefix
, addpath_encode
,
3383 /* Set MP attribute length. */
3384 stream_putc_at(s
, sizep
, (stream_get_endp(s
) - sizep
) - 1);
3388 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID
)) {
3389 if (attr
->label_index
!= BGP_INVALID_LABEL_INDEX
) {
3390 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
3391 | BGP_ATTR_FLAG_TRANS
);
3392 stream_putc(s
, BGP_ATTR_PREFIX_SID
);
3394 stream_putc(s
, BGP_PREFIX_SID_LABEL_INDEX
);
3395 stream_putc(s
, BGP_PREFIX_SID_LABEL_INDEX_LENGTH
);
3396 stream_putc(s
, 0); // reserved
3397 stream_putw(s
, 0); // flags
3398 stream_putl(s
, attr
->label_index
);
3402 /* Return total size of attribute. */
3403 len
= stream_get_endp(s
) - cp
- 2;
3404 stream_putw_at(s
, cp
, len
);