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33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
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From 17de3a023f7bde293892b41bfafe5740c8553fc8 Mon Sep 17 00:00:00 2001
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From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
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Date: Wed, 29 Apr 2020 02:50:29 +0200
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Subject: [PATCH] BGP: Fix handling of strange IPv6 link-local-only next hops
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There are three common ways how to encode IPv6 link-local-only next hops:
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(:: ll), (ll), and (ll ll). We use the first one but we should accept all
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three. The patch fixes handling of the last one.
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Thanks to Sebastian Hahn for the bugreport.
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---
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proto/bgp/packets.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c
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index ee031c05..78fdd1e0 100644
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--- a/proto/bgp/packets.c
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+++ b/proto/bgp/packets.c
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@@ -1157,7 +1157,10 @@ bgp_decode_next_hop_ip(struct bgp_parse_state *s, byte *data, uint len, rta *a)
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nh[0] = ipa_from_ip6(get_ip6(data));
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nh[1] = ipa_from_ip6(get_ip6(data+16));
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- if (ipa_is_ip4(nh[0]) || !ip6_is_link_local(nh[1]))
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+ if (ipa_is_link_local(nh[0]))
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+ { nh[1] = nh[0]; nh[0] = IPA_NONE; }
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+
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+ if (ipa_is_ip4(nh[0]) || !ipa_is_link_local(nh[1]))
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nh[1] = IPA_NONE;
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}
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else
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--
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2.24.1
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