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_errors.h"
43 #include "bgpd/bgp_label.h"
44 #include "bgpd/bgp_packet.h"
45 #include "bgpd/bgp_ecommunity.h"
46 #include "bgpd/bgp_lcommunity.h"
47 #include "bgpd/bgp_updgrp.h"
48 #include "bgpd/bgp_encap_types.h"
50 #include "bgpd/rfapi/bgp_rfapi_cfg.h"
51 #include "bgp_encap_types.h"
52 #include "bgp_vnc_types.h"
54 #include "bgp_encap_types.h"
56 #include "bgp_flowspec_private.h"
58 /* Attribute strings for logging. */
59 static const struct message attr_str
[] = {
60 {BGP_ATTR_ORIGIN
, "ORIGIN"},
61 {BGP_ATTR_AS_PATH
, "AS_PATH"},
62 {BGP_ATTR_NEXT_HOP
, "NEXT_HOP"},
63 {BGP_ATTR_MULTI_EXIT_DISC
, "MULTI_EXIT_DISC"},
64 {BGP_ATTR_LOCAL_PREF
, "LOCAL_PREF"},
65 {BGP_ATTR_ATOMIC_AGGREGATE
, "ATOMIC_AGGREGATE"},
66 {BGP_ATTR_AGGREGATOR
, "AGGREGATOR"},
67 {BGP_ATTR_COMMUNITIES
, "COMMUNITY"},
68 {BGP_ATTR_ORIGINATOR_ID
, "ORIGINATOR_ID"},
69 {BGP_ATTR_CLUSTER_LIST
, "CLUSTER_LIST"},
70 {BGP_ATTR_DPA
, "DPA"},
71 {BGP_ATTR_ADVERTISER
, "ADVERTISER"},
72 {BGP_ATTR_RCID_PATH
, "RCID_PATH"},
73 {BGP_ATTR_MP_REACH_NLRI
, "MP_REACH_NLRI"},
74 {BGP_ATTR_MP_UNREACH_NLRI
, "MP_UNREACH_NLRI"},
75 {BGP_ATTR_EXT_COMMUNITIES
, "EXT_COMMUNITIES"},
76 {BGP_ATTR_AS4_PATH
, "AS4_PATH"},
77 {BGP_ATTR_AS4_AGGREGATOR
, "AS4_AGGREGATOR"},
78 {BGP_ATTR_AS_PATHLIMIT
, "AS_PATHLIMIT"},
79 {BGP_ATTR_PMSI_TUNNEL
, "PMSI_TUNNEL_ATTRIBUTE"},
80 {BGP_ATTR_ENCAP
, "ENCAP"},
82 {BGP_ATTR_VNC
, "VNC"},
84 {BGP_ATTR_LARGE_COMMUNITIES
, "LARGE_COMMUNITY"},
85 {BGP_ATTR_PREFIX_SID
, "PREFIX_SID"},
88 static const struct message attr_flag_str
[] = {
89 {BGP_ATTR_FLAG_OPTIONAL
, "Optional"},
90 {BGP_ATTR_FLAG_TRANS
, "Transitive"},
91 {BGP_ATTR_FLAG_PARTIAL
, "Partial"},
92 /* bgp_attr_flags_diagnose() relies on this bit being last in
94 {BGP_ATTR_FLAG_EXTLEN
, "Extended Length"},
97 static struct hash
*cluster_hash
;
99 static void *cluster_hash_alloc(void *p
)
101 const struct cluster_list
*val
= (const struct cluster_list
*)p
;
102 struct cluster_list
*cluster
;
104 cluster
= XMALLOC(MTYPE_CLUSTER
, sizeof(struct cluster_list
));
105 cluster
->length
= val
->length
;
107 if (cluster
->length
) {
108 cluster
->list
= XMALLOC(MTYPE_CLUSTER_VAL
, val
->length
);
109 memcpy(cluster
->list
, val
->list
, val
->length
);
111 cluster
->list
= NULL
;
118 /* Cluster list related functions. */
119 static struct cluster_list
*cluster_parse(struct in_addr
*pnt
, int length
)
121 struct cluster_list tmp
;
122 struct cluster_list
*cluster
;
127 cluster
= hash_get(cluster_hash
, &tmp
, cluster_hash_alloc
);
132 int cluster_loop_check(struct cluster_list
*cluster
, struct in_addr originator
)
136 for (i
= 0; i
< cluster
->length
/ 4; i
++)
137 if (cluster
->list
[i
].s_addr
== originator
.s_addr
)
142 static unsigned int cluster_hash_key_make(void *p
)
144 const struct cluster_list
*cluster
= p
;
146 return jhash(cluster
->list
, cluster
->length
, 0);
149 static bool cluster_hash_cmp(const void *p1
, const void *p2
)
151 const struct cluster_list
*cluster1
= p1
;
152 const struct cluster_list
*cluster2
= p2
;
154 return (cluster1
->length
== cluster2
->length
155 && memcmp(cluster1
->list
, cluster2
->list
, cluster1
->length
)
159 static void cluster_free(struct cluster_list
*cluster
)
162 XFREE(MTYPE_CLUSTER_VAL
, cluster
->list
);
163 XFREE(MTYPE_CLUSTER
, cluster
);
166 static struct cluster_list
*cluster_intern(struct cluster_list
*cluster
)
168 struct cluster_list
*find
;
170 find
= hash_get(cluster_hash
, cluster
, cluster_hash_alloc
);
176 void cluster_unintern(struct cluster_list
*cluster
)
181 if (cluster
->refcnt
== 0) {
182 hash_release(cluster_hash
, cluster
);
183 cluster_free(cluster
);
187 static void cluster_init(void)
189 cluster_hash
= hash_create(cluster_hash_key_make
, cluster_hash_cmp
,
193 static void cluster_finish(void)
195 hash_clean(cluster_hash
, (void (*)(void *))cluster_free
);
196 hash_free(cluster_hash
);
200 static struct hash
*encap_hash
= NULL
;
202 static struct hash
*vnc_hash
= NULL
;
205 struct bgp_attr_encap_subtlv
*encap_tlv_dup(struct bgp_attr_encap_subtlv
*orig
)
207 struct bgp_attr_encap_subtlv
*new;
208 struct bgp_attr_encap_subtlv
*tail
;
209 struct bgp_attr_encap_subtlv
*p
;
211 for (p
= orig
, tail
= new = NULL
; p
; p
= p
->next
) {
212 int size
= sizeof(struct bgp_attr_encap_subtlv
) + p
->length
;
214 tail
->next
= XCALLOC(MTYPE_ENCAP_TLV
, size
);
217 tail
= new = XCALLOC(MTYPE_ENCAP_TLV
, size
);
220 memcpy(tail
, p
, size
);
227 static void encap_free(struct bgp_attr_encap_subtlv
*p
)
229 struct bgp_attr_encap_subtlv
*next
;
233 XFREE(MTYPE_ENCAP_TLV
, p
);
238 void bgp_attr_flush_encap(struct attr
*attr
)
243 if (attr
->encap_subtlvs
) {
244 encap_free(attr
->encap_subtlvs
);
245 attr
->encap_subtlvs
= NULL
;
248 if (attr
->vnc_subtlvs
) {
249 encap_free(attr
->vnc_subtlvs
);
250 attr
->vnc_subtlvs
= NULL
;
256 * Compare encap sub-tlv chains
261 * This algorithm could be made faster if needed
263 static int encap_same(const struct bgp_attr_encap_subtlv
*h1
,
264 const struct bgp_attr_encap_subtlv
*h2
)
266 const struct bgp_attr_encap_subtlv
*p
;
267 const struct bgp_attr_encap_subtlv
*q
;
271 if (h1
== NULL
|| h2
== NULL
)
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
)) {
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
)) {
301 static void *encap_hash_alloc(void *p
)
303 /* Encap structure is already allocated. */
314 static struct bgp_attr_encap_subtlv
*
315 encap_intern(struct bgp_attr_encap_subtlv
*encap
, encap_subtlv_type type
)
317 struct bgp_attr_encap_subtlv
*find
;
318 struct hash
*hash
= encap_hash
;
320 if (type
== VNC_SUBTLV_TYPE
)
324 find
= hash_get(hash
, encap
, encap_hash_alloc
);
332 static void encap_unintern(struct bgp_attr_encap_subtlv
**encapp
,
333 encap_subtlv_type type
)
335 struct bgp_attr_encap_subtlv
*encap
= *encapp
;
339 if (encap
->refcnt
== 0) {
340 struct hash
*hash
= encap_hash
;
342 if (type
== VNC_SUBTLV_TYPE
)
345 hash_release(hash
, encap
);
351 static unsigned int encap_hash_key_make(void *p
)
353 const struct bgp_attr_encap_subtlv
*encap
= p
;
355 return jhash(encap
->value
, encap
->length
, 0);
358 static bool encap_hash_cmp(const void *p1
, const void *p2
)
360 return encap_same((const struct bgp_attr_encap_subtlv
*)p1
,
361 (const struct bgp_attr_encap_subtlv
*)p2
);
364 static void encap_init(void)
366 encap_hash
= hash_create(encap_hash_key_make
, encap_hash_cmp
,
369 vnc_hash
= hash_create(encap_hash_key_make
, encap_hash_cmp
,
374 static void encap_finish(void)
376 hash_clean(encap_hash
, (void (*)(void *))encap_free
);
377 hash_free(encap_hash
);
380 hash_clean(vnc_hash
, (void (*)(void *))encap_free
);
386 static bool overlay_index_same(const struct attr
*a1
, const struct attr
*a2
)
394 return !memcmp(&(a1
->evpn_overlay
), &(a2
->evpn_overlay
),
395 sizeof(struct overlay_index
));
398 /* Unknown transit attribute. */
399 static struct hash
*transit_hash
;
401 static void transit_free(struct transit
*transit
)
404 XFREE(MTYPE_TRANSIT_VAL
, transit
->val
);
405 XFREE(MTYPE_TRANSIT
, transit
);
408 static void *transit_hash_alloc(void *p
)
410 /* Transit structure is already allocated. */
414 static struct transit
*transit_intern(struct transit
*transit
)
416 struct transit
*find
;
418 find
= hash_get(transit_hash
, transit
, transit_hash_alloc
);
420 transit_free(transit
);
426 void transit_unintern(struct transit
*transit
)
431 if (transit
->refcnt
== 0) {
432 hash_release(transit_hash
, transit
);
433 transit_free(transit
);
437 static unsigned int transit_hash_key_make(void *p
)
439 const struct transit
*transit
= p
;
441 return jhash(transit
->val
, transit
->length
, 0);
444 static bool transit_hash_cmp(const void *p1
, const void *p2
)
446 const struct transit
*transit1
= p1
;
447 const struct transit
*transit2
= p2
;
449 return (transit1
->length
== transit2
->length
450 && memcmp(transit1
->val
, transit2
->val
, transit1
->length
) == 0);
453 static void transit_init(void)
455 transit_hash
= hash_create(transit_hash_key_make
, transit_hash_cmp
,
459 static void transit_finish(void)
461 hash_clean(transit_hash
, (void (*)(void *))transit_free
);
462 hash_free(transit_hash
);
466 /* Attribute hash routines. */
467 static struct hash
*attrhash
;
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'
473 void bgp_attr_dup(struct attr
*new, struct attr
*orig
)
478 unsigned long int attr_count(void)
480 return attrhash
->count
;
483 unsigned long int attr_unknown_count(void)
485 return transit_hash
->count
;
488 unsigned int attrhash_key_make(void *p
)
490 const struct attr
*attr
= (struct attr
*)p
;
492 #define MIX(val) key = jhash_1word(val, key)
493 #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key)
495 MIX3(attr
->origin
, attr
->nexthop
.s_addr
, attr
->med
);
496 MIX3(attr
->local_pref
, attr
->aggregator_as
,
497 attr
->aggregator_addr
.s_addr
);
498 MIX3(attr
->weight
, attr
->mp_nexthop_global_in
.s_addr
,
499 attr
->originator_id
.s_addr
);
500 MIX3(attr
->tag
, attr
->label
, attr
->label_index
);
503 MIX(aspath_key_make(attr
->aspath
));
505 MIX(community_hash_make(attr
->community
));
507 if (attr
->lcommunity
)
508 MIX(lcommunity_hash_make(attr
->lcommunity
));
509 if (attr
->ecommunity
)
510 MIX(ecommunity_hash_make(attr
->ecommunity
));
512 MIX(cluster_hash_key_make(attr
->cluster
));
514 MIX(transit_hash_key_make(attr
->transit
));
515 if (attr
->encap_subtlvs
)
516 MIX(encap_hash_key_make(attr
->encap_subtlvs
));
518 if (attr
->vnc_subtlvs
)
519 MIX(encap_hash_key_make(attr
->vnc_subtlvs
));
521 MIX(attr
->mp_nexthop_len
);
522 key
= jhash(attr
->mp_nexthop_global
.s6_addr
, IPV6_MAX_BYTELEN
, key
);
523 key
= jhash(attr
->mp_nexthop_local
.s6_addr
, IPV6_MAX_BYTELEN
, key
);
524 MIX(attr
->nh_ifindex
);
525 MIX(attr
->nh_lla_ifindex
);
530 bool attrhash_cmp(const void *p1
, const void *p2
)
532 const struct attr
*attr1
= p1
;
533 const struct attr
*attr2
= p2
;
535 if (attr1
->flag
== attr2
->flag
&& attr1
->origin
== attr2
->origin
536 && attr1
->nexthop
.s_addr
== attr2
->nexthop
.s_addr
537 && attr1
->aspath
== attr2
->aspath
538 && attr1
->community
== attr2
->community
&& attr1
->med
== attr2
->med
539 && attr1
->local_pref
== attr2
->local_pref
540 && attr1
->rmap_change_flags
== attr2
->rmap_change_flags
) {
541 if (attr1
->aggregator_as
== attr2
->aggregator_as
542 && attr1
->aggregator_addr
.s_addr
543 == attr2
->aggregator_addr
.s_addr
544 && attr1
->weight
== attr2
->weight
545 && attr1
->tag
== attr2
->tag
546 && attr1
->label_index
== attr2
->label_index
547 && attr1
->mp_nexthop_len
== attr2
->mp_nexthop_len
548 && attr1
->ecommunity
== attr2
->ecommunity
549 && attr1
->lcommunity
== attr2
->lcommunity
550 && attr1
->cluster
== attr2
->cluster
551 && attr1
->transit
== attr2
->transit
552 && (attr1
->encap_tunneltype
== attr2
->encap_tunneltype
)
553 && encap_same(attr1
->encap_subtlvs
, attr2
->encap_subtlvs
)
555 && encap_same(attr1
->vnc_subtlvs
, attr2
->vnc_subtlvs
)
557 && IPV6_ADDR_SAME(&attr1
->mp_nexthop_global
,
558 &attr2
->mp_nexthop_global
)
559 && IPV6_ADDR_SAME(&attr1
->mp_nexthop_local
,
560 &attr2
->mp_nexthop_local
)
561 && IPV4_ADDR_SAME(&attr1
->mp_nexthop_global_in
,
562 &attr2
->mp_nexthop_global_in
)
563 && IPV4_ADDR_SAME(&attr1
->originator_id
,
564 &attr2
->originator_id
)
565 && overlay_index_same(attr1
, attr2
)
566 && attr1
->nh_ifindex
== attr2
->nh_ifindex
567 && attr1
->nh_lla_ifindex
== attr2
->nh_lla_ifindex
)
574 static void attrhash_init(void)
577 hash_create(attrhash_key_make
, attrhash_cmp
, "BGP Attributes");
581 * special for hash_clean below
583 static void attr_vfree(void *attr
)
585 XFREE(MTYPE_ATTR
, attr
);
588 static void attrhash_finish(void)
590 hash_clean(attrhash
, attr_vfree
);
595 static void attr_show_all_iterator(struct hash_backet
*backet
, struct vty
*vty
)
597 struct attr
*attr
= backet
->data
;
599 vty_out(vty
, "attr[%ld] nexthop %s\n", attr
->refcnt
,
600 inet_ntoa(attr
->nexthop
));
601 vty_out(vty
, "\tflags: %" PRIu64
" med: %u local_pref: %u origin: %u weight: %u label: %u\n",
602 attr
->flag
, attr
->med
, attr
->local_pref
, attr
->origin
,
603 attr
->weight
, attr
->label
);
606 void attr_show_all(struct vty
*vty
)
608 hash_iterate(attrhash
, (void (*)(struct hash_backet
*,
609 void *))attr_show_all_iterator
,
613 static void *bgp_attr_hash_alloc(void *p
)
615 struct attr
*val
= (struct attr
*)p
;
618 attr
= XMALLOC(MTYPE_ATTR
, sizeof(struct attr
));
620 if (val
->encap_subtlvs
) {
621 val
->encap_subtlvs
= NULL
;
624 if (val
->vnc_subtlvs
) {
625 val
->vnc_subtlvs
= NULL
;
632 /* Internet argument attribute. */
633 struct attr
*bgp_attr_intern(struct attr
*attr
)
637 /* Intern referenced strucutre. */
639 if (!attr
->aspath
->refcnt
)
640 attr
->aspath
= aspath_intern(attr
->aspath
);
642 attr
->aspath
->refcnt
++;
644 if (attr
->community
) {
645 if (!attr
->community
->refcnt
)
646 attr
->community
= community_intern(attr
->community
);
648 attr
->community
->refcnt
++;
651 if (attr
->ecommunity
) {
652 if (!attr
->ecommunity
->refcnt
)
653 attr
->ecommunity
= ecommunity_intern(attr
->ecommunity
);
655 attr
->ecommunity
->refcnt
++;
657 if (attr
->lcommunity
) {
658 if (!attr
->lcommunity
->refcnt
)
659 attr
->lcommunity
= lcommunity_intern(attr
->lcommunity
);
661 attr
->lcommunity
->refcnt
++;
664 if (!attr
->cluster
->refcnt
)
665 attr
->cluster
= cluster_intern(attr
->cluster
);
667 attr
->cluster
->refcnt
++;
670 if (!attr
->transit
->refcnt
)
671 attr
->transit
= transit_intern(attr
->transit
);
673 attr
->transit
->refcnt
++;
675 if (attr
->encap_subtlvs
) {
676 if (!attr
->encap_subtlvs
->refcnt
)
677 attr
->encap_subtlvs
= encap_intern(attr
->encap_subtlvs
,
680 attr
->encap_subtlvs
->refcnt
++;
683 if (attr
->vnc_subtlvs
) {
684 if (!attr
->vnc_subtlvs
->refcnt
)
685 attr
->vnc_subtlvs
= encap_intern(attr
->vnc_subtlvs
,
688 attr
->vnc_subtlvs
->refcnt
++;
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
698 find
= (struct attr
*)hash_get(attrhash
, attr
, bgp_attr_hash_alloc
);
704 /* Make network statement's attribute. */
705 struct attr
*bgp_attr_default_set(struct attr
*attr
, uint8_t origin
)
707 memset(attr
, 0, sizeof(struct attr
));
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
;
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
;
723 /* Create the attributes for an aggregate */
724 struct attr
*bgp_attr_aggregate_intern(struct bgp
*bgp
, uint8_t origin
,
725 struct aspath
*aspath
,
726 struct community
*community
,
727 struct ecommunity
*ecommunity
,
728 struct lcommunity
*lcommunity
,
729 int as_set
, uint8_t atomic_aggregate
)
734 memset(&attr
, 0, sizeof(struct attr
));
736 /* Origin attribute. */
737 attr
.origin
= origin
;
738 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
);
740 /* AS path attribute. */
742 attr
.aspath
= aspath_intern(aspath
);
744 attr
.aspath
= aspath_empty();
745 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
);
747 /* Next hop attribute. */
748 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
);
751 uint32_t gshut
= COMMUNITY_GSHUT
;
753 /* If we are not shutting down ourselves and we are
754 * aggregating a route that contains the GSHUT community we
755 * need to remove that community when creating the aggregate */
756 if (!bgp_flag_check(bgp
, BGP_FLAG_GRACEFUL_SHUTDOWN
)
757 && community_include(community
, gshut
)) {
758 community_del_val(community
, &gshut
);
761 attr
.community
= community
;
762 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
);
766 attr
.ecommunity
= ecommunity
;
767 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
);
771 attr
.lcommunity
= lcommunity
;
772 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
);
775 if (bgp_flag_check(bgp
, BGP_FLAG_GRACEFUL_SHUTDOWN
)) {
776 bgp_attr_add_gshut_community(&attr
);
779 attr
.label_index
= BGP_INVALID_LABEL_INDEX
;
780 attr
.label
= MPLS_INVALID_LABEL
;
781 attr
.weight
= BGP_ATTR_DEFAULT_WEIGHT
;
782 attr
.mp_nexthop_len
= IPV6_MAX_BYTELEN
;
783 if (!as_set
|| atomic_aggregate
)
784 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
);
785 attr
.flag
|= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
);
786 if (CHECK_FLAG(bgp
->config
, BGP_CONFIG_CONFEDERATION
))
787 attr
.aggregator_as
= bgp
->confed_id
;
789 attr
.aggregator_as
= bgp
->as
;
790 attr
.aggregator_addr
= bgp
->router_id
;
791 attr
.label_index
= BGP_INVALID_LABEL_INDEX
;
792 attr
.label
= MPLS_INVALID_LABEL
;
794 new = bgp_attr_intern(&attr
);
796 aspath_unintern(&new->aspath
);
800 /* Unintern just the sub-components of the attr, but not the attr */
801 void bgp_attr_unintern_sub(struct attr
*attr
)
803 /* aspath refcount shoud be decrement. */
805 aspath_unintern(&attr
->aspath
);
806 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
));
809 community_unintern(&attr
->community
);
810 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
));
812 if (attr
->ecommunity
)
813 ecommunity_unintern(&attr
->ecommunity
);
814 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
));
816 if (attr
->lcommunity
)
817 lcommunity_unintern(&attr
->lcommunity
);
818 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
));
821 cluster_unintern(attr
->cluster
);
822 UNSET_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST
));
825 transit_unintern(attr
->transit
);
827 if (attr
->encap_subtlvs
)
828 encap_unintern(&attr
->encap_subtlvs
, ENCAP_SUBTLV_TYPE
);
831 if (attr
->vnc_subtlvs
)
832 encap_unintern(&attr
->vnc_subtlvs
, VNC_SUBTLV_TYPE
);
837 * We have some show commands that let you experimentally
838 * apply a route-map. When we apply the route-map
839 * we are reseting values but not saving them for
840 * posterity via intern'ing( because route-maps don't
841 * do that) but at this point in time we need
842 * to compare the new attr to the old and if the
843 * routemap has changed it we need to, as Snoop Dog says,
844 * Drop it like it's hot
846 void bgp_attr_undup(struct attr
*new, struct attr
*old
)
848 if (new->aspath
!= old
->aspath
)
849 aspath_free(new->aspath
);
851 if (new->community
!= old
->community
)
852 community_free(new->community
);
854 if (new->ecommunity
!= old
->ecommunity
)
855 ecommunity_free(&new->ecommunity
);
857 if (new->lcommunity
!= old
->lcommunity
)
858 lcommunity_free(&new->lcommunity
);
861 /* Free bgp attribute and aspath. */
862 void bgp_attr_unintern(struct attr
**pattr
)
864 struct attr
*attr
= *pattr
;
868 /* Decrement attribute reference. */
873 /* If reference becomes zero then free attribute object. */
874 if (attr
->refcnt
== 0) {
875 ret
= hash_release(attrhash
, attr
);
877 XFREE(MTYPE_ATTR
, attr
);
881 bgp_attr_unintern_sub(&tmp
);
884 void bgp_attr_flush(struct attr
*attr
)
886 if (attr
->aspath
&& !attr
->aspath
->refcnt
) {
887 aspath_free(attr
->aspath
);
890 if (attr
->community
&& !attr
->community
->refcnt
) {
891 community_free(attr
->community
);
892 attr
->community
= NULL
;
895 if (attr
->ecommunity
&& !attr
->ecommunity
->refcnt
)
896 ecommunity_free(&attr
->ecommunity
);
897 if (attr
->lcommunity
&& !attr
->lcommunity
->refcnt
)
898 lcommunity_free(&attr
->lcommunity
);
899 if (attr
->cluster
&& !attr
->cluster
->refcnt
) {
900 cluster_free(attr
->cluster
);
901 attr
->cluster
= NULL
;
903 if (attr
->transit
&& !attr
->transit
->refcnt
) {
904 transit_free(attr
->transit
);
905 attr
->transit
= NULL
;
907 if (attr
->encap_subtlvs
&& !attr
->encap_subtlvs
->refcnt
) {
908 encap_free(attr
->encap_subtlvs
);
909 attr
->encap_subtlvs
= NULL
;
912 if (attr
->vnc_subtlvs
&& !attr
->vnc_subtlvs
->refcnt
) {
913 encap_free(attr
->vnc_subtlvs
);
914 attr
->vnc_subtlvs
= NULL
;
919 /* Implement draft-scudder-idr-optional-transitive behaviour and
920 * avoid resetting sessions for malformed attributes which are
921 * are partial/optional and hence where the error likely was not
922 * introduced by the sending neighbour.
924 static bgp_attr_parse_ret_t
925 bgp_attr_malformed(struct bgp_attr_parser_args
*args
, uint8_t subcode
,
928 struct peer
*const peer
= args
->peer
;
929 const uint8_t flags
= args
->flags
;
930 /* startp and length must be special-cased, as whether or not to
931 * send the attribute data with the NOTIFY depends on the error,
932 * the caller therefore signals this with the seperate length argument
934 uint8_t *notify_datap
= (length
> 0 ? args
->startp
: NULL
);
936 /* Only relax error handling for eBGP peers */
937 if (peer
->sort
!= BGP_PEER_EBGP
) {
938 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
, subcode
,
939 notify_datap
, length
);
940 return BGP_ATTR_PARSE_ERROR
;
943 /* Adjust the stream getp to the end of the attribute, in case we can
944 * still proceed but the caller hasn't read all the attribute.
946 stream_set_getp(BGP_INPUT(peer
),
947 (args
->startp
- STREAM_DATA(BGP_INPUT(peer
)))
950 switch (args
->type
) {
951 /* where an attribute is relatively inconsequential, e.g. it does not
952 * affect route selection, and can be safely ignored, then any such
953 * attributes which are malformed should just be ignored and the route
954 * processed as normal.
956 case BGP_ATTR_AS4_AGGREGATOR
:
957 case BGP_ATTR_AGGREGATOR
:
958 case BGP_ATTR_ATOMIC_AGGREGATE
:
959 return BGP_ATTR_PARSE_PROCEED
;
961 /* Core attributes, particularly ones which may influence route
962 * selection, should always cause session resets
964 case BGP_ATTR_ORIGIN
:
965 case BGP_ATTR_AS_PATH
:
966 case BGP_ATTR_NEXT_HOP
:
967 case BGP_ATTR_MULTI_EXIT_DISC
:
968 case BGP_ATTR_LOCAL_PREF
:
969 case BGP_ATTR_COMMUNITIES
:
970 case BGP_ATTR_ORIGINATOR_ID
:
971 case BGP_ATTR_CLUSTER_LIST
:
972 case BGP_ATTR_MP_REACH_NLRI
:
973 case BGP_ATTR_MP_UNREACH_NLRI
:
974 case BGP_ATTR_EXT_COMMUNITIES
:
975 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
, subcode
,
976 notify_datap
, length
);
977 return BGP_ATTR_PARSE_ERROR
;
980 /* Partial optional attributes that are malformed should not cause
981 * the whole session to be reset. Instead treat it as a withdrawal
982 * of the routes, if possible.
984 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_TRANS
)
985 && CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)
986 && CHECK_FLAG(flags
, BGP_ATTR_FLAG_PARTIAL
))
987 return BGP_ATTR_PARSE_WITHDRAW
;
989 /* default to reset */
990 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
993 /* Find out what is wrong with the path attribute flag bits and log the error.
994 "Flag bits" here stand for Optional, Transitive and Partial, but not for
995 Extended Length. Checking O/T/P bits at once implies, that the attribute
996 being diagnosed is defined by RFC as either a "well-known" or an "optional,
997 non-transitive" attribute. */
999 bgp_attr_flags_diagnose(struct bgp_attr_parser_args
*args
,
1000 uint8_t desired_flags
/* how RFC says it must be */
1003 uint8_t seen
= 0, i
;
1004 uint8_t real_flags
= args
->flags
;
1005 const uint8_t attr_code
= args
->type
;
1007 desired_flags
&= ~BGP_ATTR_FLAG_EXTLEN
;
1008 real_flags
&= ~BGP_ATTR_FLAG_EXTLEN
;
1009 for (i
= 0; i
<= 2; i
++) /* O,T,P, but not E */
1010 if (CHECK_FLAG(desired_flags
, attr_flag_str
[i
].key
)
1011 != CHECK_FLAG(real_flags
, attr_flag_str
[i
].key
)) {
1012 flog_err(EC_BGP_ATTR_FLAG
,
1013 "%s attribute must%s be flagged as \"%s\"",
1014 lookup_msg(attr_str
, attr_code
, NULL
),
1015 CHECK_FLAG(desired_flags
, attr_flag_str
[i
].key
)
1018 attr_flag_str
[i
].str
);
1023 "Strange, %s called for attr %s, but no problem found with flags"
1024 " (real flags 0x%x, desired 0x%x)",
1025 __func__
, lookup_msg(attr_str
, attr_code
, NULL
),
1026 real_flags
, desired_flags
);
1030 /* Required flags for attributes. EXTLEN will be masked off when testing,
1031 * as will PARTIAL for optional+transitive attributes.
1033 const uint8_t attr_flags_values
[] = {
1034 [BGP_ATTR_ORIGIN
] = BGP_ATTR_FLAG_TRANS
,
1035 [BGP_ATTR_AS_PATH
] = BGP_ATTR_FLAG_TRANS
,
1036 [BGP_ATTR_NEXT_HOP
] = BGP_ATTR_FLAG_TRANS
,
1037 [BGP_ATTR_MULTI_EXIT_DISC
] = BGP_ATTR_FLAG_OPTIONAL
,
1038 [BGP_ATTR_LOCAL_PREF
] = BGP_ATTR_FLAG_TRANS
,
1039 [BGP_ATTR_ATOMIC_AGGREGATE
] = BGP_ATTR_FLAG_TRANS
,
1040 [BGP_ATTR_AGGREGATOR
] = BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
,
1041 [BGP_ATTR_COMMUNITIES
] = BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
,
1042 [BGP_ATTR_ORIGINATOR_ID
] = BGP_ATTR_FLAG_OPTIONAL
,
1043 [BGP_ATTR_CLUSTER_LIST
] = BGP_ATTR_FLAG_OPTIONAL
,
1044 [BGP_ATTR_MP_REACH_NLRI
] = BGP_ATTR_FLAG_OPTIONAL
,
1045 [BGP_ATTR_MP_UNREACH_NLRI
] = BGP_ATTR_FLAG_OPTIONAL
,
1046 [BGP_ATTR_EXT_COMMUNITIES
] =
1047 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1048 [BGP_ATTR_AS4_PATH
] = BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1049 [BGP_ATTR_AS4_AGGREGATOR
] =
1050 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1051 [BGP_ATTR_PMSI_TUNNEL
] = BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1052 [BGP_ATTR_LARGE_COMMUNITIES
] =
1053 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1054 [BGP_ATTR_PREFIX_SID
] = BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
,
1056 static const size_t attr_flags_values_max
= array_size(attr_flags_values
) - 1;
1058 static int bgp_attr_flag_invalid(struct bgp_attr_parser_args
*args
)
1060 uint8_t mask
= BGP_ATTR_FLAG_EXTLEN
;
1061 const uint8_t flags
= args
->flags
;
1062 const uint8_t attr_code
= args
->type
;
1064 /* there may be attributes we don't know about */
1065 if (attr_code
> attr_flags_values_max
)
1067 if (attr_flags_values
[attr_code
] == 0)
1070 /* RFC4271, "For well-known attributes, the Transitive bit MUST be set
1074 if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL
, flags
)
1075 && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS
, flags
)) {
1078 "%s well-known attributes must have transitive flag set (%x)",
1079 lookup_msg(attr_str
, attr_code
, NULL
), flags
);
1083 /* "For well-known attributes and for optional non-transitive
1085 * the Partial bit MUST be set to 0."
1087 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_PARTIAL
)) {
1088 if (!CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)) {
1089 flog_err(EC_BGP_ATTR_FLAG
,
1090 "%s well-known attribute "
1091 "must NOT have the partial flag set (%x)",
1092 lookup_msg(attr_str
, attr_code
, NULL
), flags
);
1095 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)
1096 && !CHECK_FLAG(flags
, BGP_ATTR_FLAG_TRANS
)) {
1097 flog_err(EC_BGP_ATTR_FLAG
,
1098 "%s optional + transitive attribute "
1099 "must NOT have the partial flag set (%x)",
1100 lookup_msg(attr_str
, attr_code
, NULL
), flags
);
1105 /* Optional transitive attributes may go through speakers that don't
1106 * reocgnise them and set the Partial bit.
1108 if (CHECK_FLAG(flags
, BGP_ATTR_FLAG_OPTIONAL
)
1109 && CHECK_FLAG(flags
, BGP_ATTR_FLAG_TRANS
))
1110 SET_FLAG(mask
, BGP_ATTR_FLAG_PARTIAL
);
1112 if ((flags
& ~mask
) == attr_flags_values
[attr_code
])
1115 bgp_attr_flags_diagnose(args
, attr_flags_values
[attr_code
]);
1119 /* Get origin attribute of the update message. */
1120 static bgp_attr_parse_ret_t
bgp_attr_origin(struct bgp_attr_parser_args
*args
)
1122 struct peer
*const peer
= args
->peer
;
1123 struct attr
*const attr
= args
->attr
;
1124 const bgp_size_t length
= args
->length
;
1126 /* If any recognized attribute has Attribute Length that conflicts
1127 with the expected length (based on the attribute type code), then
1128 the Error Subcode is set to Attribute Length Error. The Data
1129 field contains the erroneous attribute (type, length and
1132 flog_err(EC_BGP_ATTR_LEN
,
1133 "Origin attribute length is not one %d", length
);
1134 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1138 /* Fetch origin attribute. */
1139 attr
->origin
= stream_getc(BGP_INPUT(peer
));
1141 /* If the ORIGIN attribute has an undefined value, then the Error
1142 Subcode is set to Invalid Origin Attribute. The Data field
1143 contains the unrecognized attribute (type, length and value). */
1144 if ((attr
->origin
!= BGP_ORIGIN_IGP
) && (attr
->origin
!= BGP_ORIGIN_EGP
)
1145 && (attr
->origin
!= BGP_ORIGIN_INCOMPLETE
)) {
1146 flog_err(EC_BGP_ATTR_ORIGIN
,
1147 "Origin attribute value is invalid %d", attr
->origin
);
1148 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_INVAL_ORIGIN
,
1152 /* Set oring attribute flag. */
1153 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
);
1158 /* Parse AS path information. This function is wrapper of
1160 static int bgp_attr_aspath(struct bgp_attr_parser_args
*args
)
1162 struct attr
*const attr
= args
->attr
;
1163 struct peer
*const peer
= args
->peer
;
1164 const bgp_size_t length
= args
->length
;
1167 * peer with AS4 => will get 4Byte ASnums
1168 * otherwise, will get 16 Bit
1170 attr
->aspath
= aspath_parse(peer
->curr
, length
,
1171 CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
));
1173 /* In case of IBGP, length will be zero. */
1174 if (!attr
->aspath
) {
1175 flog_err(EC_BGP_ATTR_MAL_AS_PATH
,
1176 "Malformed AS path from %s, length is %d", peer
->host
,
1178 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_MAL_AS_PATH
,
1182 /* Set aspath attribute flag. */
1183 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
);
1185 return BGP_ATTR_PARSE_PROCEED
;
1188 static bgp_attr_parse_ret_t
bgp_attr_aspath_check(struct peer
*const peer
,
1189 struct attr
*const attr
)
1191 /* These checks were part of bgp_attr_aspath, but with
1192 * as4 we should to check aspath things when
1193 * aspath synthesizing with as4_path has already taken place.
1194 * Otherwise we check ASPATH and use the synthesized thing, and that is
1196 * So do the checks later, i.e. here
1198 struct aspath
*aspath
;
1200 /* Confederation sanity check. */
1201 if ((peer
->sort
== BGP_PEER_CONFED
1202 && !aspath_left_confed_check(attr
->aspath
))
1203 || (peer
->sort
== BGP_PEER_EBGP
1204 && aspath_confed_check(attr
->aspath
))) {
1205 flog_err(EC_BGP_ATTR_MAL_AS_PATH
, "Malformed AS path from %s",
1207 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
1208 BGP_NOTIFY_UPDATE_MAL_AS_PATH
);
1209 return BGP_ATTR_PARSE_ERROR
;
1212 /* First AS check for EBGP. */
1213 if (CHECK_FLAG(peer
->flags
, PEER_FLAG_ENFORCE_FIRST_AS
)) {
1214 if (peer
->sort
== BGP_PEER_EBGP
1215 && !aspath_firstas_check(attr
->aspath
, peer
->as
)) {
1216 flog_err(EC_BGP_ATTR_FIRST_AS
,
1217 "%s incorrect first AS (must be %u)",
1218 peer
->host
, peer
->as
);
1219 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
1220 BGP_NOTIFY_UPDATE_MAL_AS_PATH
);
1221 return BGP_ATTR_PARSE_ERROR
;
1225 /* local-as prepend */
1226 if (peer
->change_local_as
1227 && !CHECK_FLAG(peer
->flags
, PEER_FLAG_LOCAL_AS_NO_PREPEND
)) {
1228 aspath
= aspath_dup(attr
->aspath
);
1229 aspath
= aspath_add_seq(aspath
, peer
->change_local_as
);
1230 aspath_unintern(&attr
->aspath
);
1231 attr
->aspath
= aspath_intern(aspath
);
1234 return BGP_ATTR_PARSE_PROCEED
;
1237 /* Parse AS4 path information. This function is another wrapper of
1239 static int bgp_attr_as4_path(struct bgp_attr_parser_args
*args
,
1240 struct aspath
**as4_path
)
1242 struct peer
*const peer
= args
->peer
;
1243 struct attr
*const attr
= args
->attr
;
1244 const bgp_size_t length
= args
->length
;
1246 *as4_path
= aspath_parse(peer
->curr
, length
, 1);
1248 /* In case of IBGP, length will be zero. */
1250 flog_err(EC_BGP_ATTR_MAL_AS_PATH
,
1251 "Malformed AS4 path from %s, length is %d", peer
->host
,
1253 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_MAL_AS_PATH
,
1257 /* Set aspath attribute flag. */
1258 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH
);
1260 return BGP_ATTR_PARSE_PROCEED
;
1263 /* Nexthop attribute. */
1264 static bgp_attr_parse_ret_t
bgp_attr_nexthop(struct bgp_attr_parser_args
*args
)
1266 struct peer
*const peer
= args
->peer
;
1267 struct attr
*const attr
= args
->attr
;
1268 const bgp_size_t length
= args
->length
;
1270 in_addr_t nexthop_h
, nexthop_n
;
1272 /* Check nexthop attribute length. */
1274 flog_err(EC_BGP_ATTR_LEN
,
1275 "Nexthop attribute length isn't four [%d]", length
);
1277 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1281 /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP
1282 attribute must result in a NOTIFICATION message (this is implemented
1284 At the same time, semantically incorrect NEXT_HOP is more likely to
1286 logged locally (this is implemented somewhere else). The UPDATE
1288 gets ignored in any of these cases. */
1289 nexthop_n
= stream_get_ipv4(peer
->curr
);
1290 nexthop_h
= ntohl(nexthop_n
);
1291 if ((IPV4_NET0(nexthop_h
) || IPV4_NET127(nexthop_h
)
1292 || IPV4_CLASS_DE(nexthop_h
))
1295 ALLOW_MARTIANS
)) /* loopbacks may be used in testing */
1297 char buf
[INET_ADDRSTRLEN
];
1298 inet_ntop(AF_INET
, &nexthop_n
, buf
, INET_ADDRSTRLEN
);
1299 flog_err(EC_BGP_ATTR_MARTIAN_NH
, "Martian nexthop %s", buf
);
1300 return bgp_attr_malformed(
1301 args
, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP
, args
->total
);
1304 attr
->nexthop
.s_addr
= nexthop_n
;
1305 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
);
1307 return BGP_ATTR_PARSE_PROCEED
;
1310 /* MED atrribute. */
1311 static bgp_attr_parse_ret_t
bgp_attr_med(struct bgp_attr_parser_args
*args
)
1313 struct peer
*const peer
= args
->peer
;
1314 struct attr
*const attr
= args
->attr
;
1315 const bgp_size_t length
= args
->length
;
1319 flog_err(EC_BGP_ATTR_LEN
,
1320 "MED attribute length isn't four [%d]", length
);
1322 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1326 attr
->med
= stream_getl(peer
->curr
);
1328 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC
);
1330 return BGP_ATTR_PARSE_PROCEED
;
1333 /* Local preference attribute. */
1334 static bgp_attr_parse_ret_t
1335 bgp_attr_local_pref(struct bgp_attr_parser_args
*args
)
1337 struct peer
*const peer
= args
->peer
;
1338 struct attr
*const attr
= args
->attr
;
1339 const bgp_size_t length
= args
->length
;
1343 flog_err(EC_BGP_ATTR_LEN
,
1344 "LOCAL_PREF attribute length isn't 4 [%u]", length
);
1345 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1349 /* If it is contained in an UPDATE message that is received from an
1350 external peer, then this attribute MUST be ignored by the
1351 receiving speaker. */
1352 if (peer
->sort
== BGP_PEER_EBGP
) {
1353 stream_forward_getp(peer
->curr
, length
);
1354 return BGP_ATTR_PARSE_PROCEED
;
1357 attr
->local_pref
= stream_getl(peer
->curr
);
1359 /* Set the local-pref flag. */
1360 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF
);
1362 return BGP_ATTR_PARSE_PROCEED
;
1365 /* Atomic aggregate. */
1366 static int bgp_attr_atomic(struct bgp_attr_parser_args
*args
)
1368 struct attr
*const attr
= args
->attr
;
1369 const bgp_size_t length
= args
->length
;
1373 flog_err(EC_BGP_ATTR_LEN
,
1374 "ATOMIC_AGGREGATE attribute length isn't 0 [%u]",
1376 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1380 /* Set atomic aggregate flag. */
1381 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
);
1383 return BGP_ATTR_PARSE_PROCEED
;
1386 /* Aggregator attribute */
1387 static int bgp_attr_aggregator(struct bgp_attr_parser_args
*args
)
1389 struct peer
*const peer
= args
->peer
;
1390 struct attr
*const attr
= args
->attr
;
1391 const bgp_size_t length
= args
->length
;
1395 /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */
1396 if (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
))
1399 if (length
!= wantedlen
) {
1400 flog_err(EC_BGP_ATTR_LEN
,
1401 "AGGREGATOR attribute length isn't %u [%u]", wantedlen
,
1403 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1407 if (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
))
1408 attr
->aggregator_as
= stream_getl(peer
->curr
);
1410 attr
->aggregator_as
= stream_getw(peer
->curr
);
1411 attr
->aggregator_addr
.s_addr
= stream_get_ipv4(peer
->curr
);
1413 /* Set atomic aggregate flag. */
1414 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
);
1416 return BGP_ATTR_PARSE_PROCEED
;
1419 /* New Aggregator attribute */
1420 static bgp_attr_parse_ret_t
1421 bgp_attr_as4_aggregator(struct bgp_attr_parser_args
*args
,
1422 as_t
*as4_aggregator_as
,
1423 struct in_addr
*as4_aggregator_addr
)
1425 struct peer
*const peer
= args
->peer
;
1426 struct attr
*const attr
= args
->attr
;
1427 const bgp_size_t length
= args
->length
;
1430 flog_err(EC_BGP_ATTR_LEN
, "New Aggregator length is not 8 [%d]",
1432 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1436 *as4_aggregator_as
= stream_getl(peer
->curr
);
1437 as4_aggregator_addr
->s_addr
= stream_get_ipv4(peer
->curr
);
1439 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR
);
1441 return BGP_ATTR_PARSE_PROCEED
;
1444 /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH.
1446 static bgp_attr_parse_ret_t
1447 bgp_attr_munge_as4_attrs(struct peer
*const peer
, struct attr
*const attr
,
1448 struct aspath
*as4_path
, as_t as4_aggregator
,
1449 struct in_addr
*as4_aggregator_addr
)
1451 int ignore_as4_path
= 0;
1452 struct aspath
*newpath
;
1454 if (!attr
->aspath
) {
1455 /* NULL aspath shouldn't be possible as bgp_attr_parse should
1457 * checked that all well-known, mandatory attributes were
1460 * Can only be a problem with peer itself - hard error
1462 return BGP_ATTR_PARSE_ERROR
;
1465 if (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
)) {
1466 /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR
1468 * It is worth a warning though, because the peer really
1469 * should not send them
1471 if (BGP_DEBUG(as4
, AS4
)) {
1472 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH
)))
1473 zlog_debug("[AS4] %s %s AS4_PATH", peer
->host
,
1474 "AS4 capable peer, yet it sent");
1477 & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR
)))
1478 zlog_debug("[AS4] %s %s AS4_AGGREGATOR",
1480 "AS4 capable peer, yet it sent");
1483 return BGP_ATTR_PARSE_PROCEED
;
1486 /* We have a asn16 peer. First, look for AS4_AGGREGATOR
1487 * because that may override AS4_PATH
1489 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR
))) {
1490 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
))) {
1492 * if the as_number in aggregator is not AS_TRANS,
1493 * then AS4_AGGREGATOR and AS4_PATH shall be ignored
1494 * and the Aggregator shall be taken as
1495 * info on the aggregating node, and the AS_PATH
1496 * shall be taken as the AS_PATH
1498 * the Aggregator shall be ignored and the
1499 * AS4_AGGREGATOR shall be taken as the
1500 * Aggregating node and the AS_PATH is to be
1501 * constructed "as in all other cases"
1503 if (attr
->aggregator_as
!= BGP_AS_TRANS
) {
1505 if (BGP_DEBUG(as4
, AS4
))
1507 "[AS4] %s BGP not AS4 capable peer"
1508 " send AGGREGATOR != AS_TRANS and"
1509 " AS4_AGGREGATOR, so ignore"
1510 " AS4_AGGREGATOR and AS4_PATH",
1512 ignore_as4_path
= 1;
1514 /* "New_aggregator shall be taken as aggregator"
1516 attr
->aggregator_as
= as4_aggregator
;
1517 attr
->aggregator_addr
.s_addr
=
1518 as4_aggregator_addr
->s_addr
;
1521 /* We received a AS4_AGGREGATOR but no AGGREGATOR.
1522 * That is bogus - but reading the conditions
1523 * we have to handle AS4_AGGREGATOR as if it were
1524 * AGGREGATOR in that case
1526 if (BGP_DEBUG(as4
, AS4
))
1528 "[AS4] %s BGP not AS4 capable peer send"
1529 " AS4_AGGREGATOR but no AGGREGATOR, will take"
1530 " it as if AGGREGATOR with AS_TRANS had been there",
1532 attr
->aggregator_as
= as4_aggregator
;
1533 /* sweep it under the carpet and simulate a "good"
1535 attr
->flag
|= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
));
1539 /* need to reconcile NEW_AS_PATH and AS_PATH */
1540 if (!ignore_as4_path
1541 && (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH
)))) {
1542 newpath
= aspath_reconcile_as4(attr
->aspath
, as4_path
);
1544 return BGP_ATTR_PARSE_ERROR
;
1546 aspath_unintern(&attr
->aspath
);
1547 attr
->aspath
= aspath_intern(newpath
);
1549 return BGP_ATTR_PARSE_PROCEED
;
1552 /* Community attribute. */
1553 static bgp_attr_parse_ret_t
1554 bgp_attr_community(struct bgp_attr_parser_args
*args
)
1556 struct peer
*const peer
= args
->peer
;
1557 struct attr
*const attr
= args
->attr
;
1558 const bgp_size_t length
= args
->length
;
1561 attr
->community
= NULL
;
1562 return BGP_ATTR_PARSE_PROCEED
;
1566 community_parse((uint32_t *)stream_pnt(peer
->curr
), length
);
1568 /* XXX: fix community_parse to use stream API and remove this */
1569 stream_forward_getp(peer
->curr
, length
);
1571 if (!attr
->community
)
1572 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1575 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
);
1577 return BGP_ATTR_PARSE_PROCEED
;
1580 /* Originator ID attribute. */
1581 static bgp_attr_parse_ret_t
1582 bgp_attr_originator_id(struct bgp_attr_parser_args
*args
)
1584 struct peer
*const peer
= args
->peer
;
1585 struct attr
*const attr
= args
->attr
;
1586 const bgp_size_t length
= args
->length
;
1590 flog_err(EC_BGP_ATTR_LEN
, "Bad originator ID length %d",
1593 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1597 attr
->originator_id
.s_addr
= stream_get_ipv4(peer
->curr
);
1599 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID
);
1601 return BGP_ATTR_PARSE_PROCEED
;
1604 /* Cluster list attribute. */
1605 static bgp_attr_parse_ret_t
1606 bgp_attr_cluster_list(struct bgp_attr_parser_args
*args
)
1608 struct peer
*const peer
= args
->peer
;
1609 struct attr
*const attr
= args
->attr
;
1610 const bgp_size_t length
= args
->length
;
1614 flog_err(EC_BGP_ATTR_LEN
, "Bad cluster list length %d", length
);
1616 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
1621 cluster_parse((struct in_addr
*)stream_pnt(peer
->curr
), length
);
1623 /* XXX: Fix cluster_parse to use stream API and then remove this */
1624 stream_forward_getp(peer
->curr
, length
);
1626 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST
);
1628 return BGP_ATTR_PARSE_PROCEED
;
1631 /* Multiprotocol reachability information parse. */
1632 int bgp_mp_reach_parse(struct bgp_attr_parser_args
*args
,
1633 struct bgp_nlri
*mp_update
)
1637 iana_safi_t pkt_safi
;
1639 bgp_size_t nlri_len
;
1642 struct peer
*const peer
= args
->peer
;
1643 struct attr
*const attr
= args
->attr
;
1644 const bgp_size_t length
= args
->length
;
1646 /* Set end of packet. */
1647 s
= BGP_INPUT(peer
);
1648 start
= stream_get_getp(s
);
1650 /* safe to read statically sized header? */
1651 #define BGP_MP_REACH_MIN_SIZE 5
1652 #define LEN_LEFT (length - (stream_get_getp(s) - start))
1653 if ((length
> STREAM_READABLE(s
)) || (length
< BGP_MP_REACH_MIN_SIZE
)) {
1654 zlog_info("%s: %s sent invalid length, %lu", __func__
,
1655 peer
->host
, (unsigned long)length
);
1656 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1659 /* Load AFI, SAFI. */
1660 pkt_afi
= stream_getw(s
);
1661 pkt_safi
= stream_getc(s
);
1663 /* Convert AFI, SAFI to internal values, check. */
1664 if (bgp_map_afi_safi_iana2int(pkt_afi
, pkt_safi
, &afi
, &safi
)) {
1665 /* Log if AFI or SAFI is unrecognized. This is not an error
1667 * the attribute is otherwise malformed.
1669 if (bgp_debug_update(peer
, NULL
, NULL
, 0))
1671 "%s: MP_REACH received AFI %u or SAFI %u is unrecognized",
1672 peer
->host
, pkt_afi
, pkt_safi
);
1673 return BGP_ATTR_PARSE_ERROR
;
1676 /* Get nexthop length. */
1677 attr
->mp_nexthop_len
= stream_getc(s
);
1679 if (LEN_LEFT
< attr
->mp_nexthop_len
) {
1681 "%s: %s, MP nexthop length, %u, goes past end of attribute",
1682 __func__
, peer
->host
, attr
->mp_nexthop_len
);
1683 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1686 /* Nexthop length check. */
1687 switch (attr
->mp_nexthop_len
) {
1689 if (safi
!= SAFI_FLOWSPEC
) {
1690 zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d",
1691 __func__
, peer
->host
, attr
->mp_nexthop_len
);
1692 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1695 case BGP_ATTR_NHLEN_VPNV4
:
1696 stream_getl(s
); /* RD high */
1697 stream_getl(s
); /* RD low */
1699 * NOTE: intentional fall through
1700 * - for consistency in rx processing
1702 * The following comment is to signal GCC this intention
1703 * and supress the warning
1706 case BGP_ATTR_NHLEN_IPV4
:
1707 stream_get(&attr
->mp_nexthop_global_in
, s
, IPV4_MAX_BYTELEN
);
1708 /* Probably needed for RFC 2283 */
1709 if (attr
->nexthop
.s_addr
== 0)
1710 memcpy(&attr
->nexthop
.s_addr
,
1711 &attr
->mp_nexthop_global_in
, IPV4_MAX_BYTELEN
);
1713 case BGP_ATTR_NHLEN_IPV6_GLOBAL
:
1714 case BGP_ATTR_NHLEN_VPNV6_GLOBAL
:
1715 if (attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_VPNV6_GLOBAL
) {
1716 stream_getl(s
); /* RD high */
1717 stream_getl(s
); /* RD low */
1719 stream_get(&attr
->mp_nexthop_global
, s
, IPV6_MAX_BYTELEN
);
1720 if (IN6_IS_ADDR_LINKLOCAL(&attr
->mp_nexthop_global
)) {
1721 if (!peer
->nexthop
.ifp
) {
1722 zlog_warn("%s: interface not set appropriately to handle some attributes",
1724 return BGP_ATTR_PARSE_WITHDRAW
;
1726 attr
->nh_ifindex
= peer
->nexthop
.ifp
->ifindex
;
1729 case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
:
1730 case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL
:
1731 if (attr
->mp_nexthop_len
1732 == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL
) {
1733 stream_getl(s
); /* RD high */
1734 stream_getl(s
); /* RD low */
1736 stream_get(&attr
->mp_nexthop_global
, s
, IPV6_MAX_BYTELEN
);
1737 if (IN6_IS_ADDR_LINKLOCAL(&attr
->mp_nexthop_global
)) {
1738 if (!peer
->nexthop
.ifp
) {
1739 zlog_warn("%s: interface not set appropriately to handle some attributes",
1741 return BGP_ATTR_PARSE_WITHDRAW
;
1743 attr
->nh_ifindex
= peer
->nexthop
.ifp
->ifindex
;
1745 if (attr
->mp_nexthop_len
1746 == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL
) {
1747 stream_getl(s
); /* RD high */
1748 stream_getl(s
); /* RD low */
1750 stream_get(&attr
->mp_nexthop_local
, s
, IPV6_MAX_BYTELEN
);
1751 if (!IN6_IS_ADDR_LINKLOCAL(&attr
->mp_nexthop_local
)) {
1752 char buf1
[INET6_ADDRSTRLEN
];
1753 char buf2
[INET6_ADDRSTRLEN
];
1755 if (bgp_debug_update(peer
, NULL
, NULL
, 1))
1757 "%s rcvd nexthops %s, %s -- ignoring non-LL value",
1760 &attr
->mp_nexthop_global
,
1761 buf1
, INET6_ADDRSTRLEN
),
1763 &attr
->mp_nexthop_local
, buf2
,
1766 attr
->mp_nexthop_len
= IPV6_MAX_BYTELEN
;
1768 if (!peer
->nexthop
.ifp
) {
1769 zlog_warn("%s: Interface not set appropriately to handle this some attributes",
1771 return BGP_ATTR_PARSE_WITHDRAW
;
1773 attr
->nh_lla_ifindex
= peer
->nexthop
.ifp
->ifindex
;
1776 zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d",
1777 __func__
, peer
->host
, attr
->mp_nexthop_len
);
1778 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1782 zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__
,
1784 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1789 if ((val
= stream_getc(s
)))
1791 EC_BGP_DEFUNCT_SNPA_LEN
,
1792 "%s sent non-zero value, %u, for defunct SNPA-length field",
1796 /* must have nrli_len, what is left of the attribute */
1797 nlri_len
= LEN_LEFT
;
1798 if (nlri_len
> STREAM_READABLE(s
)) {
1799 zlog_info("%s: (%s) Failed to read NLRI", __func__
, peer
->host
);
1800 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1804 zlog_info("%s: (%s) No Reachability, Treating as a EOR marker",
1805 __func__
, peer
->host
);
1807 mp_update
->afi
= afi
;
1808 mp_update
->safi
= safi
;
1809 return BGP_ATTR_PARSE_EOR
;
1812 mp_update
->afi
= afi
;
1813 mp_update
->safi
= safi
;
1814 mp_update
->nlri
= stream_pnt(s
);
1815 mp_update
->length
= nlri_len
;
1817 stream_forward_getp(s
, nlri_len
);
1819 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI
);
1821 return BGP_ATTR_PARSE_PROCEED
;
1825 /* Multiprotocol unreachable parse */
1826 int bgp_mp_unreach_parse(struct bgp_attr_parser_args
*args
,
1827 struct bgp_nlri
*mp_withdraw
)
1832 iana_safi_t pkt_safi
;
1834 uint16_t withdraw_len
;
1835 struct peer
*const peer
= args
->peer
;
1836 struct attr
*const attr
= args
->attr
;
1837 const bgp_size_t length
= args
->length
;
1841 #define BGP_MP_UNREACH_MIN_SIZE 3
1842 if ((length
> STREAM_READABLE(s
)) || (length
< BGP_MP_UNREACH_MIN_SIZE
))
1843 return BGP_ATTR_PARSE_ERROR_NOTIFYPLS
;
1845 pkt_afi
= stream_getw(s
);
1846 pkt_safi
= stream_getc(s
);
1848 /* Convert AFI, SAFI to internal values, check. */
1849 if (bgp_map_afi_safi_iana2int(pkt_afi
, pkt_safi
, &afi
, &safi
)) {
1850 /* Log if AFI or SAFI is unrecognized. This is not an error
1852 * the attribute is otherwise malformed.
1854 if (bgp_debug_update(peer
, NULL
, NULL
, 0))
1856 "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized",
1857 peer
->host
, pkt_afi
, pkt_safi
);
1858 return BGP_ATTR_PARSE_ERROR
;
1861 withdraw_len
= length
- BGP_MP_UNREACH_MIN_SIZE
;
1863 mp_withdraw
->afi
= afi
;
1864 mp_withdraw
->safi
= safi
;
1865 mp_withdraw
->nlri
= stream_pnt(s
);
1866 mp_withdraw
->length
= withdraw_len
;
1868 stream_forward_getp(s
, withdraw_len
);
1870 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI
);
1872 return BGP_ATTR_PARSE_PROCEED
;
1875 /* Large Community attribute. */
1876 static bgp_attr_parse_ret_t
1877 bgp_attr_large_community(struct bgp_attr_parser_args
*args
)
1879 struct peer
*const peer
= args
->peer
;
1880 struct attr
*const attr
= args
->attr
;
1881 const bgp_size_t length
= args
->length
;
1884 * Large community follows new attribute format.
1887 attr
->lcommunity
= NULL
;
1888 /* Empty extcomm doesn't seem to be invalid per se */
1889 return BGP_ATTR_PARSE_PROCEED
;
1893 lcommunity_parse((uint8_t *)stream_pnt(peer
->curr
), length
);
1894 /* XXX: fix ecommunity_parse to use stream API */
1895 stream_forward_getp(peer
->curr
, length
);
1897 if (!attr
->lcommunity
)
1898 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1901 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
);
1903 return BGP_ATTR_PARSE_PROCEED
;
1906 /* Extended Community attribute. */
1907 static bgp_attr_parse_ret_t
1908 bgp_attr_ext_communities(struct bgp_attr_parser_args
*args
)
1910 struct peer
*const peer
= args
->peer
;
1911 struct attr
*const attr
= args
->attr
;
1912 const bgp_size_t length
= args
->length
;
1916 attr
->ecommunity
= NULL
;
1917 /* Empty extcomm doesn't seem to be invalid per se */
1918 return BGP_ATTR_PARSE_PROCEED
;
1922 ecommunity_parse((uint8_t *)stream_pnt(peer
->curr
), length
);
1923 /* XXX: fix ecommunity_parse to use stream API */
1924 stream_forward_getp(peer
->curr
, length
);
1926 if (!attr
->ecommunity
)
1927 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
1930 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
);
1932 /* Extract MAC mobility sequence number, if any. */
1933 attr
->mm_seqnum
= bgp_attr_mac_mobility_seqnum(attr
, &sticky
);
1934 attr
->sticky
= sticky
;
1936 /* Check if this is a Gateway MAC-IP advertisement */
1937 attr
->default_gw
= bgp_attr_default_gw(attr
);
1939 /* Handle scenario where router flag ecommunity is not
1940 * set but default gw ext community is present.
1941 * Use default gateway, set and propogate R-bit.
1943 if (attr
->default_gw
)
1944 attr
->router_flag
= 1;
1946 /* Check EVPN Neighbor advertisement flags, R-bit */
1947 bgp_attr_evpn_na_flag(attr
, &attr
->router_flag
);
1949 /* Extract the Rmac, if any */
1950 bgp_attr_rmac(attr
, &attr
->rmac
);
1952 return BGP_ATTR_PARSE_PROCEED
;
1955 /* Parse Tunnel Encap attribute in an UPDATE */
1956 static int bgp_attr_encap(uint8_t type
, struct peer
*peer
, /* IN */
1957 bgp_size_t length
, /* IN: attr's length field */
1958 struct attr
*attr
, /* IN: caller already allocated */
1959 uint8_t flag
, /* IN: attr's flags field */
1963 uint16_t tunneltype
= 0;
1965 total
= length
+ (CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
) ? 4 : 3);
1967 if (!CHECK_FLAG(flag
, BGP_ATTR_FLAG_TRANS
)
1968 || !CHECK_FLAG(flag
, BGP_ATTR_FLAG_OPTIONAL
)) {
1970 "Tunnel Encap attribute flag isn't optional and transitive %d",
1972 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
,
1973 BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR
,
1978 if (BGP_ATTR_ENCAP
== type
) {
1979 /* read outer TLV type and length */
1980 uint16_t tlv_length
;
1984 "Tunnel Encap attribute not long enough to contain outer T,L");
1985 bgp_notify_send_with_data(
1986 peer
, BGP_NOTIFY_UPDATE_ERR
,
1987 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
, startp
, total
);
1990 tunneltype
= stream_getw(BGP_INPUT(peer
));
1991 tlv_length
= stream_getw(BGP_INPUT(peer
));
1994 if (tlv_length
!= length
) {
1995 zlog_info("%s: tlv_length(%d) != length(%d)", __func__
,
1996 tlv_length
, length
);
2000 while (length
>= 4) {
2001 uint16_t subtype
= 0;
2002 uint16_t sublength
= 0;
2003 struct bgp_attr_encap_subtlv
*tlv
;
2005 if (BGP_ATTR_ENCAP
== type
) {
2006 subtype
= stream_getc(BGP_INPUT(peer
));
2007 sublength
= stream_getc(BGP_INPUT(peer
));
2011 subtype
= stream_getw(BGP_INPUT(peer
));
2012 sublength
= stream_getw(BGP_INPUT(peer
));
2017 if (sublength
> length
) {
2019 "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
2021 bgp_notify_send_with_data(
2022 peer
, BGP_NOTIFY_UPDATE_ERR
,
2023 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
, startp
, total
);
2027 /* alloc and copy sub-tlv */
2028 /* TBD make sure these are freed when attributes are released */
2029 tlv
= XCALLOC(MTYPE_ENCAP_TLV
,
2030 sizeof(struct bgp_attr_encap_subtlv
) + sublength
);
2031 tlv
->type
= subtype
;
2032 tlv
->length
= sublength
;
2033 stream_get(tlv
->value
, peer
->curr
, sublength
);
2034 length
-= sublength
;
2036 /* attach tlv to encap chain */
2037 if (BGP_ATTR_ENCAP
== type
) {
2038 struct bgp_attr_encap_subtlv
*stlv_last
;
2039 for (stlv_last
= attr
->encap_subtlvs
;
2040 stlv_last
&& stlv_last
->next
;
2041 stlv_last
= stlv_last
->next
)
2044 stlv_last
->next
= tlv
;
2046 attr
->encap_subtlvs
= tlv
;
2050 struct bgp_attr_encap_subtlv
*stlv_last
;
2051 for (stlv_last
= attr
->vnc_subtlvs
;
2052 stlv_last
&& stlv_last
->next
;
2053 stlv_last
= stlv_last
->next
)
2056 stlv_last
->next
= tlv
;
2058 attr
->vnc_subtlvs
= tlv
;
2064 if (BGP_ATTR_ENCAP
== type
) {
2065 attr
->encap_tunneltype
= tunneltype
;
2069 /* spurious leftover data */
2071 "Tunnel Encap attribute length is bad: %d leftover octets",
2073 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
,
2074 BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
2083 * Read an individual SID value returning how much data we have read
2084 * Returns 0 if there was an error that needs to be passed up the stack
2086 static bgp_attr_parse_ret_t
bgp_attr_psid_sub(int32_t type
,
2088 struct bgp_attr_parser_args
*args
,
2089 struct bgp_nlri
*mp_update
)
2091 struct peer
*const peer
= args
->peer
;
2092 struct attr
*const attr
= args
->attr
;
2093 uint32_t label_index
;
2094 struct in6_addr ipv6_sid
;
2096 uint32_t srgb_range
;
2099 if (type
== BGP_PREFIX_SID_LABEL_INDEX
) {
2100 if (length
!= BGP_PREFIX_SID_LABEL_INDEX_LENGTH
) {
2103 "Prefix SID label index length is %d instead of %d",
2104 length
, BGP_PREFIX_SID_LABEL_INDEX_LENGTH
);
2105 return bgp_attr_malformed(args
,
2106 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2110 /* Ignore flags and reserved */
2111 stream_getc(peer
->curr
);
2112 stream_getw(peer
->curr
);
2114 /* Fetch the label index and see if it is valid. */
2115 label_index
= stream_getl(peer
->curr
);
2116 if (label_index
== BGP_INVALID_LABEL_INDEX
)
2117 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
2120 /* Store label index; subsequently, we'll check on
2122 attr
->label_index
= label_index
;
2125 * Ignore the Label index attribute unless received for
2129 if (!mp_update
->length
2130 || mp_update
->safi
!= SAFI_LABELED_UNICAST
)
2131 attr
->label_index
= BGP_INVALID_LABEL_INDEX
;
2134 /* Placeholder code for the IPv6 SID type */
2135 else if (type
== BGP_PREFIX_SID_IPV6
) {
2136 if (length
!= BGP_PREFIX_SID_IPV6_LENGTH
) {
2137 flog_err(EC_BGP_ATTR_LEN
,
2138 "Prefix SID IPv6 length is %d instead of %d",
2139 length
, BGP_PREFIX_SID_IPV6_LENGTH
);
2140 return bgp_attr_malformed(args
,
2141 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2145 /* Ignore reserved */
2146 stream_getc(peer
->curr
);
2147 stream_getw(peer
->curr
);
2149 stream_get(&ipv6_sid
, peer
->curr
, 16);
2152 /* Placeholder code for the Originator SRGB type */
2153 else if (type
== BGP_PREFIX_SID_ORIGINATOR_SRGB
) {
2155 stream_getw(peer
->curr
);
2159 if (length
% BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH
) {
2162 "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ",
2163 length
, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH
);
2164 return bgp_attr_malformed(
2165 args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2169 srgb_count
= length
/ BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH
;
2171 for (int i
= 0; i
< srgb_count
; i
++) {
2172 stream_get(&srgb_base
, peer
->curr
, 3);
2173 stream_get(&srgb_range
, peer
->curr
, 3);
2177 return BGP_ATTR_PARSE_PROCEED
;
2180 /* Prefix SID attribute
2181 * draft-ietf-idr-bgp-prefix-sid-05
2183 bgp_attr_parse_ret_t
2184 bgp_attr_prefix_sid(int32_t tlength
, struct bgp_attr_parser_args
*args
,
2185 struct bgp_nlri
*mp_update
)
2187 struct peer
*const peer
= args
->peer
;
2188 struct attr
*const attr
= args
->attr
;
2189 bgp_attr_parse_ret_t ret
;
2191 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID
);
2194 int32_t type
, length
;
2196 type
= stream_getc(peer
->curr
);
2197 length
= stream_getw(peer
->curr
);
2199 ret
= bgp_attr_psid_sub(type
, length
, args
, mp_update
);
2201 if (ret
!= BGP_ATTR_PARSE_PROCEED
)
2204 * Subtract length + the T and the L
2205 * since length is the Vector portion
2207 tlength
-= length
+ 3;
2212 "Prefix SID internal length %d causes us to read beyond the total Prefix SID length",
2214 return bgp_attr_malformed(args
,
2215 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2220 return BGP_ATTR_PARSE_PROCEED
;
2223 /* PMSI tunnel attribute (RFC 6514)
2224 * Basic validation checks done here.
2226 static bgp_attr_parse_ret_t
2227 bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args
*args
)
2229 struct peer
*const peer
= args
->peer
;
2230 struct attr
*const attr
= args
->attr
;
2231 const bgp_size_t length
= args
->length
;
2234 /* Verify that the receiver is expecting "ingress replication" as we
2235 * can only support that.
2238 flog_err(EC_BGP_ATTR_LEN
, "Bad PMSI tunnel attribute length %d",
2240 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2243 stream_getc(peer
->curr
); /* Flags */
2244 tnl_type
= stream_getc(peer
->curr
);
2245 if (tnl_type
> PMSI_TNLTYPE_MAX
) {
2246 flog_err(EC_BGP_ATTR_PMSI_TYPE
,
2247 "Invalid PMSI tunnel attribute type %d", tnl_type
);
2248 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR
,
2251 if (tnl_type
== PMSI_TNLTYPE_INGR_REPL
) {
2253 flog_err(EC_BGP_ATTR_PMSI_LEN
,
2254 "Bad PMSI tunnel attribute length %d for IR",
2256 return bgp_attr_malformed(
2257 args
, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
,
2262 attr
->flag
|= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL
);
2263 attr
->pmsi_tnl_type
= tnl_type
;
2265 /* Forward read pointer of input stream. */
2266 stream_forward_getp(peer
->curr
, length
- 2);
2268 return BGP_ATTR_PARSE_PROCEED
;
2271 /* BGP unknown attribute treatment. */
2272 static bgp_attr_parse_ret_t
bgp_attr_unknown(struct bgp_attr_parser_args
*args
)
2274 bgp_size_t total
= args
->total
;
2275 struct transit
*transit
;
2276 struct peer
*const peer
= args
->peer
;
2277 struct attr
*const attr
= args
->attr
;
2278 uint8_t *const startp
= args
->startp
;
2279 const uint8_t type
= args
->type
;
2280 const uint8_t flag
= args
->flags
;
2281 const bgp_size_t length
= args
->length
;
2283 if (bgp_debug_update(peer
, NULL
, NULL
, 1))
2285 "%s Unknown attribute is received (type %d, length %d)",
2286 peer
->host
, type
, length
);
2288 /* Forward read pointer of input stream. */
2289 stream_forward_getp(peer
->curr
, length
);
2291 /* If any of the mandatory well-known attributes are not recognized,
2292 then the Error Subcode is set to Unrecognized Well-known
2293 Attribute. The Data field contains the unrecognized attribute
2294 (type, length and value). */
2295 if (!CHECK_FLAG(flag
, BGP_ATTR_FLAG_OPTIONAL
)) {
2296 return bgp_attr_malformed(args
, BGP_NOTIFY_UPDATE_UNREC_ATTR
,
2300 /* Unrecognized non-transitive optional attributes must be quietly
2301 ignored and not passed along to other BGP peers. */
2302 if (!CHECK_FLAG(flag
, BGP_ATTR_FLAG_TRANS
))
2303 return BGP_ATTR_PARSE_PROCEED
;
2305 /* If a path with recognized transitive optional attribute is
2306 accepted and passed along to other BGP peers and the Partial bit
2307 in the Attribute Flags octet is set to 1 by some previous AS, it
2308 is not set back to 0 by the current AS. */
2309 SET_FLAG(*startp
, BGP_ATTR_FLAG_PARTIAL
);
2311 /* Store transitive attribute to the end of attr->transit. */
2313 attr
->transit
= XCALLOC(MTYPE_TRANSIT
, sizeof(struct transit
));
2315 transit
= attr
->transit
;
2318 transit
->val
= XREALLOC(MTYPE_TRANSIT_VAL
, transit
->val
,
2319 transit
->length
+ total
);
2321 transit
->val
= XMALLOC(MTYPE_TRANSIT_VAL
, total
);
2323 memcpy(transit
->val
+ transit
->length
, startp
, total
);
2324 transit
->length
+= total
;
2326 return BGP_ATTR_PARSE_PROCEED
;
2329 /* Well-known attribute check. */
2330 static int bgp_attr_check(struct peer
*peer
, struct attr
*attr
)
2334 /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an
2336 if (CHECK_FLAG(peer
->cap
, PEER_CAP_RESTART_RCV
) && !attr
->flag
)
2337 return BGP_ATTR_PARSE_PROCEED
;
2339 /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required
2340 to carry any other path attributes.", though if MP_REACH_NLRI or NLRI
2341 are present, it should. Check for any other attribute being present
2344 if ((!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI
)) &&
2345 CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI
))))
2346 return BGP_ATTR_PARSE_PROCEED
;
2348 if (!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN
)))
2349 type
= BGP_ATTR_ORIGIN
;
2351 if (!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
)))
2352 type
= BGP_ATTR_AS_PATH
;
2354 /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present
2356 * NLRI is empty. We can't easily check NLRI empty here though.
2358 if (!CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
))
2359 && !CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI
)))
2360 type
= BGP_ATTR_NEXT_HOP
;
2362 if (peer
->sort
== BGP_PEER_IBGP
2363 && !CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF
)))
2364 type
= BGP_ATTR_LOCAL_PREF
;
2367 flog_warn(EC_BGP_MISSING_ATTRIBUTE
,
2368 "%s Missing well-known attribute %s.", peer
->host
,
2369 lookup_msg(attr_str
, type
, NULL
));
2370 bgp_notify_send_with_data(peer
, BGP_NOTIFY_UPDATE_ERR
,
2371 BGP_NOTIFY_UPDATE_MISS_ATTR
, &type
,
2373 return BGP_ATTR_PARSE_ERROR
;
2375 return BGP_ATTR_PARSE_PROCEED
;
2378 /* Read attribute of update packet. This function is called from
2379 bgp_update_receive() in bgp_packet.c. */
2380 bgp_attr_parse_ret_t
bgp_attr_parse(struct peer
*peer
, struct attr
*attr
,
2381 bgp_size_t size
, struct bgp_nlri
*mp_update
,
2382 struct bgp_nlri
*mp_withdraw
)
2384 bgp_attr_parse_ret_t ret
;
2388 uint8_t *startp
, *endp
;
2390 uint8_t seen
[BGP_ATTR_BITMAP_SIZE
];
2391 /* we need the as4_path only until we have synthesized the as_path with
2393 /* same goes for as4_aggregator */
2394 struct aspath
*as4_path
= NULL
;
2395 as_t as4_aggregator
= 0;
2396 struct in_addr as4_aggregator_addr
= {.s_addr
= 0};
2398 /* Initialize bitmap. */
2399 memset(seen
, 0, BGP_ATTR_BITMAP_SIZE
);
2401 /* End pointer of BGP attribute. */
2402 endp
= BGP_INPUT_PNT(peer
) + size
;
2404 /* Get attributes to the end of attribute length. */
2405 while (BGP_INPUT_PNT(peer
) < endp
) {
2406 /* Check remaining length check.*/
2407 if (endp
- BGP_INPUT_PNT(peer
) < BGP_ATTR_MIN_LEN
) {
2408 /* XXX warning: long int format, int arg (arg 5) */
2410 EC_BGP_ATTRIBUTE_TOO_SMALL
,
2411 "%s: error BGP attribute length %lu is smaller than min len",
2413 (unsigned long)(endp
2414 - stream_pnt(BGP_INPUT(peer
))));
2416 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2417 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2418 return BGP_ATTR_PARSE_ERROR
;
2421 /* Fetch attribute flag and type. */
2422 startp
= BGP_INPUT_PNT(peer
);
2423 /* "The lower-order four bits of the Attribute Flags octet are
2424 unused. They MUST be zero when sent and MUST be ignored when
2426 flag
= 0xF0 & stream_getc(BGP_INPUT(peer
));
2427 type
= stream_getc(BGP_INPUT(peer
));
2429 /* Check whether Extended-Length applies and is in bounds */
2430 if (CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
)
2431 && ((endp
- startp
) < (BGP_ATTR_MIN_LEN
+ 1))) {
2433 EC_BGP_EXT_ATTRIBUTE_TOO_SMALL
,
2434 "%s: Extended length set, but just %lu bytes of attr header",
2436 (unsigned long)(endp
2437 - stream_pnt(BGP_INPUT(peer
))));
2439 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2440 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2441 return BGP_ATTR_PARSE_ERROR
;
2444 /* Check extended attribue length bit. */
2445 if (CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
))
2446 length
= stream_getw(BGP_INPUT(peer
));
2448 length
= stream_getc(BGP_INPUT(peer
));
2450 /* If any attribute appears more than once in the UPDATE
2451 message, then the Error Subcode is set to Malformed Attribute
2454 if (CHECK_BITMAP(seen
, type
)) {
2456 EC_BGP_ATTRIBUTE_REPEATED
,
2457 "%s: error BGP attribute type %d appears twice in a message",
2460 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2461 BGP_NOTIFY_UPDATE_MAL_ATTR
);
2462 return BGP_ATTR_PARSE_ERROR
;
2465 /* Set type to bitmap to check duplicate attribute. `type' is
2466 unsigned char so it never overflow bitmap range. */
2468 SET_BITMAP(seen
, type
);
2470 /* Overflow check. */
2471 attr_endp
= BGP_INPUT_PNT(peer
) + length
;
2473 if (attr_endp
> endp
) {
2475 EC_BGP_ATTRIBUTE_TOO_LARGE
,
2476 "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p",
2477 peer
->host
, type
, length
, size
, attr_endp
,
2481 * If any recognized attribute has an Attribute
2482 * Length that conflicts with the expected length
2483 * (based on the attribute type code), then the
2484 * Error Subcode MUST be set to Attribute Length
2485 * Error. The Data field MUST contain the erroneous
2486 * attribute (type, length, and value).
2488 * We do not currently have a good way to determine the
2489 * length of the attribute independent of the length
2490 * received in the message. Instead we send the
2491 * minimum between the amount of data we have and the
2492 * amount specified by the attribute length field.
2494 * Instead of directly passing in the packet buffer and
2495 * offset we use the stream_get* functions to read into
2496 * a stack buffer, since they perform bounds checking
2497 * and we are working with untrusted data.
2499 unsigned char ndata
[BGP_MAX_PACKET_SIZE
];
2500 memset(ndata
, 0x00, sizeof(ndata
));
2502 CHECK_FLAG(flag
, BGP_ATTR_FLAG_EXTLEN
) ? 2 : 1;
2503 /* Rewind to end of flag field */
2504 stream_forward_getp(BGP_INPUT(peer
), -(1 + lfl
));
2506 stream_get(&ndata
[0], BGP_INPUT(peer
), 1);
2508 stream_get(&ndata
[1], BGP_INPUT(peer
), lfl
);
2510 size_t atl
= attr_endp
- startp
;
2511 size_t ndl
= MIN(atl
, STREAM_READABLE(BGP_INPUT(peer
)));
2512 stream_get(&ndata
[lfl
+ 1], BGP_INPUT(peer
), ndl
);
2514 bgp_notify_send_with_data(
2515 peer
, BGP_NOTIFY_UPDATE_ERR
,
2516 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
, ndata
,
2519 return BGP_ATTR_PARSE_ERROR
;
2522 struct bgp_attr_parser_args attr_args
= {
2529 .total
= attr_endp
- startp
,
2533 /* If any recognized attribute has Attribute Flags that conflict
2534 with the Attribute Type Code, then the Error Subcode is set
2536 Attribute Flags Error. The Data field contains the erroneous
2537 attribute (type, length and value). */
2538 if (bgp_attr_flag_invalid(&attr_args
)) {
2539 ret
= bgp_attr_malformed(
2540 &attr_args
, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR
,
2542 if (ret
== BGP_ATTR_PARSE_PROCEED
)
2547 /* OK check attribute and store it's value. */
2549 case BGP_ATTR_ORIGIN
:
2550 ret
= bgp_attr_origin(&attr_args
);
2552 case BGP_ATTR_AS_PATH
:
2553 ret
= bgp_attr_aspath(&attr_args
);
2555 case BGP_ATTR_AS4_PATH
:
2556 ret
= bgp_attr_as4_path(&attr_args
, &as4_path
);
2558 case BGP_ATTR_NEXT_HOP
:
2559 ret
= bgp_attr_nexthop(&attr_args
);
2561 case BGP_ATTR_MULTI_EXIT_DISC
:
2562 ret
= bgp_attr_med(&attr_args
);
2564 case BGP_ATTR_LOCAL_PREF
:
2565 ret
= bgp_attr_local_pref(&attr_args
);
2567 case BGP_ATTR_ATOMIC_AGGREGATE
:
2568 ret
= bgp_attr_atomic(&attr_args
);
2570 case BGP_ATTR_AGGREGATOR
:
2571 ret
= bgp_attr_aggregator(&attr_args
);
2573 case BGP_ATTR_AS4_AGGREGATOR
:
2574 ret
= bgp_attr_as4_aggregator(&attr_args
,
2576 &as4_aggregator_addr
);
2578 case BGP_ATTR_COMMUNITIES
:
2579 ret
= bgp_attr_community(&attr_args
);
2581 case BGP_ATTR_LARGE_COMMUNITIES
:
2582 ret
= bgp_attr_large_community(&attr_args
);
2584 case BGP_ATTR_ORIGINATOR_ID
:
2585 ret
= bgp_attr_originator_id(&attr_args
);
2587 case BGP_ATTR_CLUSTER_LIST
:
2588 ret
= bgp_attr_cluster_list(&attr_args
);
2590 case BGP_ATTR_MP_REACH_NLRI
:
2591 ret
= bgp_mp_reach_parse(&attr_args
, mp_update
);
2593 case BGP_ATTR_MP_UNREACH_NLRI
:
2594 ret
= bgp_mp_unreach_parse(&attr_args
, mp_withdraw
);
2596 case BGP_ATTR_EXT_COMMUNITIES
:
2597 ret
= bgp_attr_ext_communities(&attr_args
);
2602 case BGP_ATTR_ENCAP
:
2603 ret
= bgp_attr_encap(type
, peer
, length
, attr
, flag
,
2606 case BGP_ATTR_PREFIX_SID
:
2607 ret
= bgp_attr_prefix_sid(length
,
2608 &attr_args
, mp_update
);
2610 case BGP_ATTR_PMSI_TUNNEL
:
2611 ret
= bgp_attr_pmsi_tunnel(&attr_args
);
2614 ret
= bgp_attr_unknown(&attr_args
);
2618 if (ret
== BGP_ATTR_PARSE_ERROR_NOTIFYPLS
) {
2619 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2620 BGP_NOTIFY_UPDATE_MAL_ATTR
);
2621 ret
= BGP_ATTR_PARSE_ERROR
;
2624 if (ret
== BGP_ATTR_PARSE_EOR
) {
2626 aspath_unintern(&as4_path
);
2630 /* If hard error occured immediately return to the caller. */
2631 if (ret
== BGP_ATTR_PARSE_ERROR
) {
2632 flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR
,
2633 "%s: Attribute %s, parse error", peer
->host
,
2634 lookup_msg(attr_str
, type
, NULL
));
2636 aspath_unintern(&as4_path
);
2639 if (ret
== BGP_ATTR_PARSE_WITHDRAW
) {
2642 EC_BGP_ATTRIBUTE_PARSE_WITHDRAW
,
2643 "%s: Attribute %s, parse error - treating as withdrawal",
2644 peer
->host
, lookup_msg(attr_str
, type
, NULL
));
2646 aspath_unintern(&as4_path
);
2650 /* Check the fetched length. */
2651 if (BGP_INPUT_PNT(peer
) != attr_endp
) {
2652 flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR
,
2653 "%s: BGP attribute %s, fetch error",
2654 peer
->host
, lookup_msg(attr_str
, type
, NULL
));
2655 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2656 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2658 aspath_unintern(&as4_path
);
2659 return BGP_ATTR_PARSE_ERROR
;
2663 /* Check final read pointer is same as end pointer. */
2664 if (BGP_INPUT_PNT(peer
) != endp
) {
2665 flog_warn(EC_BGP_ATTRIBUTES_MISMATCH
,
2666 "%s: BGP attribute %s, length mismatch", peer
->host
,
2667 lookup_msg(attr_str
, type
, NULL
));
2668 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2669 BGP_NOTIFY_UPDATE_ATTR_LENG_ERR
);
2671 aspath_unintern(&as4_path
);
2672 return BGP_ATTR_PARSE_ERROR
;
2675 /* Check all mandatory well-known attributes are present */
2676 if ((ret
= bgp_attr_check(peer
, attr
)) < 0) {
2678 aspath_unintern(&as4_path
);
2683 * At this place we can see whether we got AS4_PATH and/or
2684 * AS4_AGGREGATOR from a 16Bit peer and act accordingly.
2685 * We can not do this before we've read all attributes because
2686 * the as4 handling does not say whether AS4_PATH has to be sent
2687 * after AS_PATH or not - and when AS4_AGGREGATOR will be send
2688 * in relationship to AGGREGATOR.
2689 * So, to be defensive, we are not relying on any order and read
2690 * all attributes first, including these 32bit ones, and now,
2691 * afterwards, we look what and if something is to be done for as4.
2693 * It is possible to not have AS_PATH, e.g. GR EoR and sole
2696 /* actually... this doesn't ever return failure currently, but
2697 * better safe than sorry */
2698 if (CHECK_FLAG(attr
->flag
, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
))
2699 && bgp_attr_munge_as4_attrs(peer
, attr
, as4_path
, as4_aggregator
,
2700 &as4_aggregator_addr
)) {
2701 bgp_notify_send(peer
, BGP_NOTIFY_UPDATE_ERR
,
2702 BGP_NOTIFY_UPDATE_MAL_ATTR
);
2704 aspath_unintern(&as4_path
);
2705 return BGP_ATTR_PARSE_ERROR
;
2708 /* At this stage, we have done all fiddling with as4, and the
2709 * resulting info is in attr->aggregator resp. attr->aspath
2710 * so we can chuck as4_aggregator and as4_path alltogether in
2711 * order to save memory
2714 aspath_unintern(&as4_path
); /* unintern - it is in the hash */
2715 /* The flag that we got this is still there, but that does not
2720 * The "rest" of the code does nothing with as4_aggregator.
2721 * there is no memory attached specifically which is not part
2723 * so ignoring just means do nothing.
2726 * Finally do the checks on the aspath we did not do yet
2727 * because we waited for a potentially synthesized aspath.
2729 if (attr
->flag
& (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH
))) {
2730 ret
= bgp_attr_aspath_check(peer
, attr
);
2731 if (ret
!= BGP_ATTR_PARSE_PROCEED
)
2734 /* Finally intern unknown attribute. */
2736 attr
->transit
= transit_intern(attr
->transit
);
2737 if (attr
->encap_subtlvs
)
2738 attr
->encap_subtlvs
=
2739 encap_intern(attr
->encap_subtlvs
, ENCAP_SUBTLV_TYPE
);
2741 if (attr
->vnc_subtlvs
)
2743 encap_intern(attr
->vnc_subtlvs
, VNC_SUBTLV_TYPE
);
2746 return BGP_ATTR_PARSE_PROCEED
;
2749 size_t bgp_packet_mpattr_start(struct stream
*s
, struct peer
*peer
, afi_t afi
,
2750 safi_t safi
, struct bpacket_attr_vec_arr
*vecarr
,
2755 iana_safi_t pkt_safi
;
2758 /* Set extended bit always to encode the attribute length as 2 bytes */
2759 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_EXTLEN
);
2760 stream_putc(s
, BGP_ATTR_MP_REACH_NLRI
);
2761 sizep
= stream_get_endp(s
);
2762 stream_putw(s
, 0); /* Marker: Attribute length. */
2765 /* Convert AFI, SAFI to values for packet. */
2766 bgp_map_afi_safi_int2iana(afi
, safi
, &pkt_afi
, &pkt_safi
);
2768 stream_putw(s
, pkt_afi
); /* AFI */
2769 stream_putc(s
, pkt_safi
); /* SAFI */
2773 && (safi
== SAFI_UNICAST
|| safi
== SAFI_LABELED_UNICAST
))
2774 nh_afi
= peer_cap_enhe(peer
, afi
, safi
) ? AFI_IP6
: AFI_IP
;
2776 nh_afi
= BGP_NEXTHOP_AFI_FROM_NHLEN(attr
->mp_nexthop_len
);
2779 bpacket_attr_vec_arr_set_vec(vecarr
, BGP_ATTR_VEC_NH
, s
, attr
);
2784 case SAFI_MULTICAST
:
2785 case SAFI_LABELED_UNICAST
:
2787 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
2791 stream_putl(s
, 0); /* RD = 0, per RFC */
2793 stream_put(s
, &attr
->mp_nexthop_global_in
, 4);
2798 stream_put(s
, &attr
->mp_nexthop_global_in
, 4);
2801 stream_putc(s
, 0); /* no nexthop for flowspec */
2809 case SAFI_MULTICAST
:
2810 case SAFI_LABELED_UNICAST
:
2812 if (attr
->mp_nexthop_len
2813 == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
) {
2815 BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
);
2816 stream_put(s
, &attr
->mp_nexthop_global
,
2818 stream_put(s
, &attr
->mp_nexthop_local
,
2821 stream_putc(s
, IPV6_MAX_BYTELEN
);
2822 stream_put(s
, &attr
->mp_nexthop_global
,
2826 case SAFI_MPLS_VPN
: {
2827 if (attr
->mp_nexthop_len
2828 == BGP_ATTR_NHLEN_IPV6_GLOBAL
) {
2830 stream_putl(s
, 0); /* RD = 0, per RFC */
2832 stream_put(s
, &attr
->mp_nexthop_global
,
2834 } else if (attr
->mp_nexthop_len
2835 == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
) {
2837 stream_putl(s
, 0); /* RD = 0, per RFC */
2839 stream_put(s
, &attr
->mp_nexthop_global
,
2841 stream_putl(s
, 0); /* RD = 0, per RFC */
2843 stream_put(s
, &attr
->mp_nexthop_local
,
2848 stream_putc(s
, IPV6_MAX_BYTELEN
);
2849 stream_put(s
, &attr
->mp_nexthop_global
,
2853 stream_putc(s
, 0); /* no nexthop for flowspec */
2859 if (safi
!= SAFI_FLOWSPEC
)
2861 EC_BGP_ATTR_NH_SEND_LEN
,
2862 "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d",
2863 peer
->host
, afi
, safi
, attr
->mp_nexthop_len
);
2872 void bgp_packet_mpattr_prefix(struct stream
*s
, afi_t afi
, safi_t safi
,
2873 struct prefix
*p
, struct prefix_rd
*prd
,
2874 mpls_label_t
*label
, uint32_t num_labels
,
2875 int addpath_encode
, uint32_t addpath_tx_id
,
2878 if (safi
== SAFI_MPLS_VPN
) {
2880 stream_putl(s
, addpath_tx_id
);
2881 /* Label, RD, Prefix write. */
2882 stream_putc(s
, p
->prefixlen
+ 88);
2883 stream_put(s
, label
, BGP_LABEL_BYTES
);
2884 stream_put(s
, prd
->val
, 8);
2885 stream_put(s
, &p
->u
.prefix
, PSIZE(p
->prefixlen
));
2886 } else if (afi
== AFI_L2VPN
&& safi
== SAFI_EVPN
) {
2887 /* EVPN prefix - contents depend on type */
2888 bgp_evpn_encode_prefix(s
, p
, prd
, label
, num_labels
, attr
,
2889 addpath_encode
, addpath_tx_id
);
2890 } else if (safi
== SAFI_LABELED_UNICAST
) {
2891 /* Prefix write with label. */
2892 stream_put_labeled_prefix(s
, p
, label
);
2893 } else if (safi
== SAFI_FLOWSPEC
) {
2894 if (PSIZE (p
->prefixlen
)+2 < FLOWSPEC_NLRI_SIZELIMIT
)
2895 stream_putc(s
, PSIZE (p
->prefixlen
)+2);
2897 stream_putw(s
, (PSIZE (p
->prefixlen
)+2)|(0xf<<12));
2898 stream_putc(s
, 2);/* Filter type */
2899 stream_putc(s
, p
->prefixlen
);/* Prefix length */
2900 stream_put(s
, &p
->u
.prefix
, PSIZE (p
->prefixlen
));
2902 stream_put_prefix_addpath(s
, p
, addpath_encode
, addpath_tx_id
);
2905 size_t bgp_packet_mpattr_prefix_size(afi_t afi
, safi_t safi
, struct prefix
*p
)
2907 int size
= PSIZE(p
->prefixlen
);
2908 if (safi
== SAFI_MPLS_VPN
)
2910 else if (afi
== AFI_L2VPN
&& safi
== SAFI_EVPN
)
2911 size
+= 232; // TODO: Maximum possible for type-2, type-3 and
2917 * Encodes the tunnel encapsulation attribute,
2918 * and with ENABLE_BGP_VNC the VNC attribute which uses
2919 * almost the same TLV format
2921 static void bgp_packet_mpattr_tea(struct bgp
*bgp
, struct peer
*peer
,
2922 struct stream
*s
, struct attr
*attr
,
2925 unsigned int attrlenfield
= 0;
2926 unsigned int attrhdrlen
= 0;
2927 struct bgp_attr_encap_subtlv
*subtlvs
;
2928 struct bgp_attr_encap_subtlv
*st
;
2929 const char *attrname
;
2931 if (!attr
|| (attrtype
== BGP_ATTR_ENCAP
2932 && (!attr
->encap_tunneltype
2933 || attr
->encap_tunneltype
== BGP_ENCAP_TYPE_MPLS
)))
2937 case BGP_ATTR_ENCAP
:
2938 attrname
= "Tunnel Encap";
2939 subtlvs
= attr
->encap_subtlvs
;
2940 if (subtlvs
== NULL
) /* nothing to do */
2943 * The tunnel encap attr has an "outer" tlv.
2945 * L = total length of subtlvs,
2946 * V = concatenated subtlvs.
2948 attrlenfield
= 2 + 2; /* T + L */
2949 attrhdrlen
= 1 + 1; /* subTLV T + L */
2955 subtlvs
= attr
->vnc_subtlvs
;
2956 if (subtlvs
== NULL
) /* nothing to do */
2958 attrlenfield
= 0; /* no outer T + L */
2959 attrhdrlen
= 2 + 2; /* subTLV T + L */
2967 /* compute attr length */
2968 for (st
= subtlvs
; st
; st
= st
->next
) {
2969 attrlenfield
+= (attrhdrlen
+ st
->length
);
2972 if (attrlenfield
> 0xffff) {
2973 zlog_info("%s attribute is too long (length=%d), can't send it",
2974 attrname
, attrlenfield
);
2978 if (attrlenfield
> 0xff) {
2979 /* 2-octet length field */
2981 BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
2982 | BGP_ATTR_FLAG_EXTLEN
);
2983 stream_putc(s
, attrtype
);
2984 stream_putw(s
, attrlenfield
& 0xffff);
2986 /* 1-octet length field */
2987 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
);
2988 stream_putc(s
, attrtype
);
2989 stream_putc(s
, attrlenfield
& 0xff);
2992 if (attrtype
== BGP_ATTR_ENCAP
) {
2993 /* write outer T+L */
2994 stream_putw(s
, attr
->encap_tunneltype
);
2995 stream_putw(s
, attrlenfield
- 4);
2998 /* write each sub-tlv */
2999 for (st
= subtlvs
; st
; st
= st
->next
) {
3000 if (attrtype
== BGP_ATTR_ENCAP
) {
3001 stream_putc(s
, st
->type
);
3002 stream_putc(s
, st
->length
);
3005 stream_putw(s
, st
->type
);
3006 stream_putw(s
, st
->length
);
3009 stream_put(s
, st
->value
, st
->length
);
3013 void bgp_packet_mpattr_end(struct stream
*s
, size_t sizep
)
3015 /* Set MP attribute length. Don't count the (2) bytes used to encode
3017 stream_putw_at(s
, sizep
, (stream_get_endp(s
) - sizep
) - 2);
3020 /* Make attribute packet. */
3021 bgp_size_t
bgp_packet_attribute(struct bgp
*bgp
, struct peer
*peer
,
3022 struct stream
*s
, struct attr
*attr
,
3023 struct bpacket_attr_vec_arr
*vecarr
,
3024 struct prefix
*p
, afi_t afi
, safi_t safi
,
3025 struct peer
*from
, struct prefix_rd
*prd
,
3026 mpls_label_t
*label
, uint32_t num_labels
,
3027 int addpath_encode
, uint32_t addpath_tx_id
)
3030 size_t aspath_sizep
;
3031 struct aspath
*aspath
;
3032 int send_as4_path
= 0;
3033 int send_as4_aggregator
= 0;
3034 int use32bit
= (CHECK_FLAG(peer
->cap
, PEER_CAP_AS4_RCV
)) ? 1 : 0;
3039 /* Remember current pointer. */
3040 cp
= stream_get_endp(s
);
3043 && !((afi
== AFI_IP
&& safi
== SAFI_UNICAST
)
3044 && !peer_cap_enhe(peer
, afi
, safi
))) {
3045 size_t mpattrlen_pos
= 0;
3047 mpattrlen_pos
= bgp_packet_mpattr_start(s
, peer
, afi
, safi
,
3049 bgp_packet_mpattr_prefix(s
, afi
, safi
, p
, prd
, label
,
3050 num_labels
, addpath_encode
,
3051 addpath_tx_id
, attr
);
3052 bgp_packet_mpattr_end(s
, mpattrlen_pos
);
3055 /* Origin attribute. */
3056 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3057 stream_putc(s
, BGP_ATTR_ORIGIN
);
3059 stream_putc(s
, attr
->origin
);
3061 /* AS path attribute. */
3063 /* If remote-peer is EBGP */
3064 if (peer
->sort
== BGP_PEER_EBGP
3065 && (!CHECK_FLAG(peer
->af_flags
[afi
][safi
],
3066 PEER_FLAG_AS_PATH_UNCHANGED
)
3067 || attr
->aspath
->segments
== NULL
)
3068 && (!CHECK_FLAG(peer
->af_flags
[afi
][safi
],
3069 PEER_FLAG_RSERVER_CLIENT
))) {
3070 aspath
= aspath_dup(attr
->aspath
);
3072 /* Even though we may not be configured for confederations we
3074 * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */
3075 aspath
= aspath_delete_confed_seq(aspath
);
3077 if (CHECK_FLAG(bgp
->config
, BGP_CONFIG_CONFEDERATION
)) {
3078 /* Stuff our path CONFED_ID on the front */
3079 aspath
= aspath_add_seq(aspath
, bgp
->confed_id
);
3081 if (peer
->change_local_as
) {
3082 /* If replace-as is specified, we only use the
3083 change_local_as when
3084 advertising routes. */
3087 PEER_FLAG_LOCAL_AS_REPLACE_AS
)) {
3088 aspath
= aspath_add_seq(aspath
,
3091 aspath
= aspath_add_seq(aspath
,
3092 peer
->change_local_as
);
3094 aspath
= aspath_add_seq(aspath
, peer
->local_as
);
3097 } else if (peer
->sort
== BGP_PEER_CONFED
) {
3098 /* A confed member, so we need to do the AS_CONFED_SEQUENCE
3100 aspath
= aspath_dup(attr
->aspath
);
3101 aspath
= aspath_add_confed_seq(aspath
, peer
->local_as
);
3103 aspath
= attr
->aspath
;
3105 /* If peer is not AS4 capable, then:
3106 * - send the created AS_PATH out as AS4_PATH (optional, transitive),
3107 * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path
3109 * types are in it (i.e. exclude them if they are there)
3110 * AND do this only if there is at least one asnum > 65535 in the
3112 * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and
3114 * all ASnums > 65535 to BGP_AS_TRANS
3117 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_EXTLEN
);
3118 stream_putc(s
, BGP_ATTR_AS_PATH
);
3119 aspath_sizep
= stream_get_endp(s
);
3121 stream_putw_at(s
, aspath_sizep
, aspath_put(s
, aspath
, use32bit
));
3123 /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs
3126 if (!use32bit
&& aspath_has_as4(aspath
))
3128 1; /* we'll do this later, at the correct place */
3130 /* Nexthop attribute. */
3131 if (afi
== AFI_IP
&& safi
== SAFI_UNICAST
3132 && !peer_cap_enhe(peer
, afi
, safi
)) {
3133 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP
)) {
3134 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3135 stream_putc(s
, BGP_ATTR_NEXT_HOP
);
3136 bpacket_attr_vec_arr_set_vec(vecarr
, BGP_ATTR_VEC_NH
, s
,
3139 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
3140 } else if (peer_cap_enhe(from
, afi
, safi
)) {
3142 * Likely this is the case when an IPv4 prefix was
3144 * Extended Next-hop capability and now being advertised
3147 * Setting the mandatory (ipv4) next-hop attribute here
3149 * implicit next-hop self with correct (ipv4 address
3152 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3153 stream_putc(s
, BGP_ATTR_NEXT_HOP
);
3154 bpacket_attr_vec_arr_set_vec(vecarr
, BGP_ATTR_VEC_NH
, s
,
3157 stream_put_ipv4(s
, 0);
3161 /* MED attribute. */
3162 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC
)
3163 || bgp
->maxmed_active
) {
3164 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3165 stream_putc(s
, BGP_ATTR_MULTI_EXIT_DISC
);
3167 stream_putl(s
, (bgp
->maxmed_active
? bgp
->maxmed_value
3171 /* Local preference. */
3172 if (peer
->sort
== BGP_PEER_IBGP
|| peer
->sort
== BGP_PEER_CONFED
) {
3173 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3174 stream_putc(s
, BGP_ATTR_LOCAL_PREF
);
3176 stream_putl(s
, attr
->local_pref
);
3179 /* Atomic aggregate. */
3180 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
)) {
3181 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3182 stream_putc(s
, BGP_ATTR_ATOMIC_AGGREGATE
);
3187 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
)) {
3188 /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */
3189 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
3190 stream_putc(s
, BGP_ATTR_AGGREGATOR
);
3193 /* AS4 capable peer */
3195 stream_putl(s
, attr
->aggregator_as
);
3197 /* 2-byte AS peer */
3200 /* Is ASN representable in 2-bytes? Or must AS_TRANS be
3202 if (attr
->aggregator_as
> 65535) {
3203 stream_putw(s
, BGP_AS_TRANS
);
3205 /* we have to send AS4_AGGREGATOR, too.
3206 * we'll do that later in order to send
3207 * attributes in ascending
3210 send_as4_aggregator
= 1;
3212 stream_putw(s
, (uint16_t)attr
->aggregator_as
);
3214 stream_put_ipv4(s
, attr
->aggregator_addr
.s_addr
);
3217 /* Community attribute. */
3218 if (CHECK_FLAG(peer
->af_flags
[afi
][safi
], PEER_FLAG_SEND_COMMUNITY
)
3219 && (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
))) {
3220 if (attr
->community
->size
* 4 > 255) {
3222 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
3223 | BGP_ATTR_FLAG_EXTLEN
);
3224 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
3225 stream_putw(s
, attr
->community
->size
* 4);
3228 BGP_ATTR_FLAG_OPTIONAL
3229 | BGP_ATTR_FLAG_TRANS
);
3230 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
3231 stream_putc(s
, attr
->community
->size
* 4);
3233 stream_put(s
, attr
->community
->val
, attr
->community
->size
* 4);
3237 * Large Community attribute.
3239 if (CHECK_FLAG(peer
->af_flags
[afi
][safi
],
3240 PEER_FLAG_SEND_LARGE_COMMUNITY
)
3241 && (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
))) {
3242 if (lcom_length(attr
->lcommunity
) > 255) {
3244 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
3245 | BGP_ATTR_FLAG_EXTLEN
);
3246 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
3247 stream_putw(s
, lcom_length(attr
->lcommunity
));
3250 BGP_ATTR_FLAG_OPTIONAL
3251 | BGP_ATTR_FLAG_TRANS
);
3252 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
3253 stream_putc(s
, lcom_length(attr
->lcommunity
));
3255 stream_put(s
, attr
->lcommunity
->val
,
3256 lcom_length(attr
->lcommunity
));
3259 /* Route Reflector. */
3260 if (peer
->sort
== BGP_PEER_IBGP
&& from
3261 && from
->sort
== BGP_PEER_IBGP
) {
3262 /* Originator ID. */
3263 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3264 stream_putc(s
, BGP_ATTR_ORIGINATOR_ID
);
3267 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID
))
3268 stream_put_in_addr(s
, &attr
->originator_id
);
3270 stream_put_in_addr(s
, &from
->remote_id
);
3273 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3274 stream_putc(s
, BGP_ATTR_CLUSTER_LIST
);
3276 if (attr
->cluster
) {
3277 stream_putc(s
, attr
->cluster
->length
+ 4);
3278 /* If this peer configuration's parent BGP has
3280 if (bgp
->config
& BGP_CONFIG_CLUSTER_ID
)
3281 stream_put_in_addr(s
, &bgp
->cluster_id
);
3283 stream_put_in_addr(s
, &bgp
->router_id
);
3284 stream_put(s
, attr
->cluster
->list
,
3285 attr
->cluster
->length
);
3288 /* If this peer configuration's parent BGP has
3290 if (bgp
->config
& BGP_CONFIG_CLUSTER_ID
)
3291 stream_put_in_addr(s
, &bgp
->cluster_id
);
3293 stream_put_in_addr(s
, &bgp
->router_id
);
3297 /* Extended Communities attribute. */
3298 if (CHECK_FLAG(peer
->af_flags
[afi
][safi
], PEER_FLAG_SEND_EXT_COMMUNITY
)
3299 && (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES
))) {
3300 if (peer
->sort
== BGP_PEER_IBGP
3301 || peer
->sort
== BGP_PEER_CONFED
) {
3302 if (attr
->ecommunity
->size
* 8 > 255) {
3304 BGP_ATTR_FLAG_OPTIONAL
3305 | BGP_ATTR_FLAG_TRANS
3306 | BGP_ATTR_FLAG_EXTLEN
);
3307 stream_putc(s
, BGP_ATTR_EXT_COMMUNITIES
);
3308 stream_putw(s
, attr
->ecommunity
->size
* 8);
3311 BGP_ATTR_FLAG_OPTIONAL
3312 | BGP_ATTR_FLAG_TRANS
);
3313 stream_putc(s
, BGP_ATTR_EXT_COMMUNITIES
);
3314 stream_putc(s
, attr
->ecommunity
->size
* 8);
3316 stream_put(s
, attr
->ecommunity
->val
,
3317 attr
->ecommunity
->size
* 8);
3321 int ecom_tr_size
= 0;
3324 for (i
= 0; i
< attr
->ecommunity
->size
; i
++) {
3325 pnt
= attr
->ecommunity
->val
+ (i
* 8);
3328 if (CHECK_FLAG(tbit
,
3329 ECOMMUNITY_FLAG_NON_TRANSITIVE
))
3336 if (ecom_tr_size
* 8 > 255) {
3339 BGP_ATTR_FLAG_OPTIONAL
3340 | BGP_ATTR_FLAG_TRANS
3341 | BGP_ATTR_FLAG_EXTLEN
);
3343 BGP_ATTR_EXT_COMMUNITIES
);
3344 stream_putw(s
, ecom_tr_size
* 8);
3348 BGP_ATTR_FLAG_OPTIONAL
3349 | BGP_ATTR_FLAG_TRANS
);
3351 BGP_ATTR_EXT_COMMUNITIES
);
3352 stream_putc(s
, ecom_tr_size
* 8);
3355 for (i
= 0; i
< attr
->ecommunity
->size
; i
++) {
3356 pnt
= attr
->ecommunity
->val
+ (i
* 8);
3361 ECOMMUNITY_FLAG_NON_TRANSITIVE
))
3364 stream_put(s
, pnt
, 8);
3370 /* Label index attribute. */
3371 if (safi
== SAFI_LABELED_UNICAST
) {
3372 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID
)) {
3373 uint32_t label_index
;
3375 label_index
= attr
->label_index
;
3377 if (label_index
!= BGP_INVALID_LABEL_INDEX
) {
3379 BGP_ATTR_FLAG_OPTIONAL
3380 | BGP_ATTR_FLAG_TRANS
);
3381 stream_putc(s
, BGP_ATTR_PREFIX_SID
);
3383 stream_putc(s
, BGP_PREFIX_SID_LABEL_INDEX
);
3385 BGP_PREFIX_SID_LABEL_INDEX_LENGTH
);
3386 stream_putc(s
, 0); // reserved
3387 stream_putw(s
, 0); // flags
3388 stream_putl(s
, label_index
);
3393 if (send_as4_path
) {
3394 /* If the peer is NOT As4 capable, AND */
3395 /* there are ASnums > 65535 in path THEN
3396 * give out AS4_PATH */
3398 /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET
3400 * Hm, I wonder... confederation things *should* only be at
3401 * the beginning of an aspath, right? Then we should use
3402 * aspath_delete_confed_seq for this, because it is already
3404 * Folks, talk to me: what is reasonable here!?
3406 aspath
= aspath_delete_confed_seq(aspath
);
3409 BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_OPTIONAL
3410 | BGP_ATTR_FLAG_EXTLEN
);
3411 stream_putc(s
, BGP_ATTR_AS4_PATH
);
3412 aspath_sizep
= stream_get_endp(s
);
3414 stream_putw_at(s
, aspath_sizep
, aspath_put(s
, aspath
, 1));
3417 if (aspath
!= attr
->aspath
)
3418 aspath_free(aspath
);
3420 if (send_as4_aggregator
) {
3421 /* send AS4_AGGREGATOR, at this place */
3422 /* this section of code moved here in order to ensure the
3424 * *ascending* order of attributes
3426 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
3427 stream_putc(s
, BGP_ATTR_AS4_AGGREGATOR
);
3429 stream_putl(s
, attr
->aggregator_as
);
3430 stream_put_ipv4(s
, attr
->aggregator_addr
.s_addr
);
3433 if (((afi
== AFI_IP
|| afi
== AFI_IP6
)
3434 && (safi
== SAFI_ENCAP
|| safi
== SAFI_MPLS_VPN
))
3435 || (afi
== AFI_L2VPN
&& safi
== SAFI_EVPN
)) {
3436 /* Tunnel Encap attribute */
3437 bgp_packet_mpattr_tea(bgp
, peer
, s
, attr
, BGP_ATTR_ENCAP
);
3441 bgp_packet_mpattr_tea(bgp
, peer
, s
, attr
, BGP_ATTR_VNC
);
3446 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL
)) {
3447 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
3448 stream_putc(s
, BGP_ATTR_PMSI_TUNNEL
);
3449 stream_putc(s
, 9); // Length
3450 stream_putc(s
, 0); // Flags
3451 stream_putc(s
, PMSI_TNLTYPE_INGR_REPL
); // IR (6)
3452 stream_put(s
, &(attr
->label
),
3453 BGP_LABEL_BYTES
); // MPLS Label / VXLAN VNI
3454 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
3455 // Unicast tunnel endpoint IP address
3458 /* Unknown transit attribute. */
3460 stream_put(s
, attr
->transit
->val
, attr
->transit
->length
);
3462 /* Return total size of attribute. */
3463 return stream_get_endp(s
) - cp
;
3466 size_t bgp_packet_mpunreach_start(struct stream
*s
, afi_t afi
, safi_t safi
)
3468 unsigned long attrlen_pnt
;
3470 iana_safi_t pkt_safi
;
3472 /* Set extended bit always to encode the attribute length as 2 bytes */
3473 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_EXTLEN
);
3474 stream_putc(s
, BGP_ATTR_MP_UNREACH_NLRI
);
3476 attrlen_pnt
= stream_get_endp(s
);
3477 stream_putw(s
, 0); /* Length of this attribute. */
3479 /* Convert AFI, SAFI to values for packet. */
3480 bgp_map_afi_safi_int2iana(afi
, safi
, &pkt_afi
, &pkt_safi
);
3482 stream_putw(s
, pkt_afi
);
3483 stream_putc(s
, pkt_safi
);
3488 void bgp_packet_mpunreach_prefix(struct stream
*s
, struct prefix
*p
, afi_t afi
,
3489 safi_t safi
, struct prefix_rd
*prd
,
3490 mpls_label_t
*label
, uint32_t num_labels
,
3491 int addpath_encode
, uint32_t addpath_tx_id
,
3494 uint8_t wlabel
[3] = {0x80, 0x00, 0x00};
3496 if (safi
== SAFI_LABELED_UNICAST
) {
3497 label
= (mpls_label_t
*)wlabel
;
3501 return bgp_packet_mpattr_prefix(s
, afi
, safi
, p
, prd
, label
, num_labels
,
3502 addpath_encode
, addpath_tx_id
, attr
);
3505 void bgp_packet_mpunreach_end(struct stream
*s
, size_t attrlen_pnt
)
3507 bgp_packet_mpattr_end(s
, attrlen_pnt
);
3510 /* Initialization of attribute. */
3511 void bgp_attr_init(void)
3523 void bgp_attr_finish(void)
3528 ecommunity_finish();
3529 lcommunity_finish();
3535 /* Make attribute packet. */
3536 void bgp_dump_routes_attr(struct stream
*s
, struct attr
*attr
,
3537 struct prefix
*prefix
)
3542 struct aspath
*aspath
;
3543 int addpath_encode
= 0;
3544 uint32_t addpath_tx_id
= 0;
3546 /* Remember current pointer. */
3547 cp
= stream_get_endp(s
);
3549 /* Place holder of length. */
3552 /* Origin attribute. */
3553 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3554 stream_putc(s
, BGP_ATTR_ORIGIN
);
3556 stream_putc(s
, attr
->origin
);
3558 aspath
= attr
->aspath
;
3560 stream_putc(s
, BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_EXTLEN
);
3561 stream_putc(s
, BGP_ATTR_AS_PATH
);
3562 aspath_lenp
= stream_get_endp(s
);
3565 stream_putw_at(s
, aspath_lenp
, aspath_put(s
, aspath
, 1));
3567 /* Nexthop attribute. */
3568 /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */
3569 if (prefix
!= NULL
&& prefix
->family
!= AF_INET6
) {
3570 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3571 stream_putc(s
, BGP_ATTR_NEXT_HOP
);
3573 stream_put_ipv4(s
, attr
->nexthop
.s_addr
);
3576 /* MED attribute. */
3577 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC
)) {
3578 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3579 stream_putc(s
, BGP_ATTR_MULTI_EXIT_DISC
);
3581 stream_putl(s
, attr
->med
);
3584 /* Local preference. */
3585 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF
)) {
3586 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3587 stream_putc(s
, BGP_ATTR_LOCAL_PREF
);
3589 stream_putl(s
, attr
->local_pref
);
3592 /* Atomic aggregate. */
3593 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE
)) {
3594 stream_putc(s
, BGP_ATTR_FLAG_TRANS
);
3595 stream_putc(s
, BGP_ATTR_ATOMIC_AGGREGATE
);
3600 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR
)) {
3601 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
);
3602 stream_putc(s
, BGP_ATTR_AGGREGATOR
);
3604 stream_putl(s
, attr
->aggregator_as
);
3605 stream_put_ipv4(s
, attr
->aggregator_addr
.s_addr
);
3608 /* Community attribute. */
3609 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES
)) {
3610 if (attr
->community
->size
* 4 > 255) {
3612 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
3613 | BGP_ATTR_FLAG_EXTLEN
);
3614 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
3615 stream_putw(s
, attr
->community
->size
* 4);
3618 BGP_ATTR_FLAG_OPTIONAL
3619 | BGP_ATTR_FLAG_TRANS
);
3620 stream_putc(s
, BGP_ATTR_COMMUNITIES
);
3621 stream_putc(s
, attr
->community
->size
* 4);
3623 stream_put(s
, attr
->community
->val
, attr
->community
->size
* 4);
3626 /* Large Community attribute. */
3627 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES
)) {
3628 if (lcom_length(attr
->lcommunity
) > 255) {
3630 BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS
3631 | BGP_ATTR_FLAG_EXTLEN
);
3632 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
3633 stream_putw(s
, lcom_length(attr
->lcommunity
));
3636 BGP_ATTR_FLAG_OPTIONAL
3637 | BGP_ATTR_FLAG_TRANS
);
3638 stream_putc(s
, BGP_ATTR_LARGE_COMMUNITIES
);
3639 stream_putc(s
, lcom_length(attr
->lcommunity
));
3642 stream_put(s
, attr
->lcommunity
->val
,
3643 lcom_length(attr
->lcommunity
));
3646 /* Add a MP_NLRI attribute to dump the IPv6 next hop */
3647 if (prefix
!= NULL
&& prefix
->family
== AF_INET6
3648 && (attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL
3649 || attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
)) {
3652 stream_putc(s
, BGP_ATTR_FLAG_OPTIONAL
);
3653 stream_putc(s
, BGP_ATTR_MP_REACH_NLRI
);
3654 sizep
= stream_get_endp(s
);
3657 stream_putc(s
, 0); /* Marker: Attribute length. */
3658 stream_putw(s
, AFI_IP6
); /* AFI */
3659 stream_putc(s
, SAFI_UNICAST
); /* SAFI */
3662 stream_putc(s
, attr
->mp_nexthop_len
);
3663 stream_put(s
, &attr
->mp_nexthop_global
, IPV6_MAX_BYTELEN
);
3664 if (attr
->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
)
3665 stream_put(s
, &attr
->mp_nexthop_local
,
3672 stream_put_prefix_addpath(s
, prefix
, addpath_encode
,
3675 /* Set MP attribute length. */
3676 stream_putc_at(s
, sizep
, (stream_get_endp(s
) - sizep
) - 1);
3680 if (attr
->flag
& ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID
)) {
3681 if (attr
->label_index
!= BGP_INVALID_LABEL_INDEX
) {
3683 BGP_ATTR_FLAG_OPTIONAL
3684 | BGP_ATTR_FLAG_TRANS
);
3685 stream_putc(s
, BGP_ATTR_PREFIX_SID
);
3687 stream_putc(s
, BGP_PREFIX_SID_LABEL_INDEX
);
3688 stream_putc(s
, BGP_PREFIX_SID_LABEL_INDEX_LENGTH
);
3689 stream_putc(s
, 0); // reserved
3690 stream_putw(s
, 0); // flags
3691 stream_putl(s
, attr
->label_index
);
3695 /* Return total size of attribute. */
3696 len
= stream_get_endp(s
) - cp
- 2;
3697 stream_putw_at(s
, cp
, len
);