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FRR: T5221: Fixed BGP as-override behavior

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Override peer's ASN even if original as-path contains other ASNs

This is a backport of 9bbdb4572d3bb255211fecf1c756452ab27e91c2 from
the main FRR repository
This commit is contained in:
zsdc 2023-05-12 14:18:45 +03:00
parent 3ba073d0e1
commit f0cf9ac8a9
1 changed files with 77 additions and 0 deletions
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77
packages/frr/patches/0003-Fix-as-override-behavior.patch Normal file
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@ -0,0 +1,77 @@
From 6320d4941777d317989209f26ca513379f729c30 Mon Sep 17 00:00:00 2001
From: zsdc <taras@vyos.io>
Date: Fri, 12 May 2023 13:56:20 +0300
Subject: [PATCH] Fix as-override behavior
Backported 9bbdb4572d3bb255211fecf1c756452ab27e91c2 from FRR 8.5
---
bgpd/bgp_aspath.c | 22 ----------------------
bgpd/bgp_aspath.h | 1 -
bgpd/bgp_route.c | 4 +---
3 files changed, 1 insertion(+), 26 deletions(-)
diff --git a/bgpd/bgp_aspath.c b/bgpd/bgp_aspath.c
index 5cf3c60fa..9595bae5f 100644
--- a/bgpd/bgp_aspath.c
+++ b/bgpd/bgp_aspath.c
@@ -1215,28 +1215,6 @@ bool aspath_private_as_check(struct aspath *aspath)
return true;
}
-/* Return True if the entire ASPATH consist of the specified ASN */
-bool aspath_single_asn_check(struct aspath *aspath, as_t asn)
-{
- struct assegment *seg;
-
- if (!(aspath && aspath->segments))
- return false;
-
- seg = aspath->segments;
-
- while (seg) {
- int i;
-
- for (i = 0; i < seg->length; i++) {
- if (seg->as[i] != asn)
- return false;
- }
- seg = seg->next;
- }
- return true;
-}
-
/* Replace all instances of the target ASN with our own ASN */
struct aspath *aspath_replace_specific_asn(struct aspath *aspath,
as_t target_asn, as_t our_asn)
diff --git a/bgpd/bgp_aspath.h b/bgpd/bgp_aspath.h
index 9df352fcd..9bab5bb7b 100644
--- a/bgpd/bgp_aspath.h
+++ b/bgpd/bgp_aspath.h
@@ -108,7 +108,6 @@ extern unsigned int aspath_get_first_as(struct aspath *);
extern unsigned int aspath_get_last_as(struct aspath *);
extern int aspath_loop_check(struct aspath *, as_t);
extern bool aspath_private_as_check(struct aspath *);
-extern bool aspath_single_asn_check(struct aspath *, as_t asn);
extern struct aspath *aspath_replace_specific_asn(struct aspath *aspath,
as_t target_asn,
as_t our_asn);
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 48ccb669b..6de3e2a7f 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -1571,11 +1571,9 @@ static void bgp_peer_as_override(struct bgp *bgp, afi_t afi, safi_t safi,
struct peer *peer, struct attr *attr)
{
if (peer->sort == BGP_PEER_EBGP
- && peer_af_flag_check(peer, afi, safi, PEER_FLAG_AS_OVERRIDE)) {
- if (aspath_single_asn_check(attr->aspath, peer->as))
+ && peer_af_flag_check(peer, afi, safi, PEER_FLAG_AS_OVERRIDE))
attr->aspath = aspath_replace_specific_asn(
attr->aspath, peer->as, bgp->as);
- }
}
void bgp_attr_add_gshut_community(struct attr *attr)
--
2.34.1