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BGP: Promiscuous ASN mode

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Allow to specify just 'internal' or 'external' for remote neighbor
instead of specific ASN. In the second case that means BGP peers with
any non-local ASNs are accepted.
This commit is contained in:
Ondrej Zajicek (work)
2019-04-03 15:54:50 +02:00
parent a22c3e5968
commit 23ee6b1cd6
5 changed files with 42 additions and 12 deletions
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9
proto/bgp/packets.c
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@@ -732,13 +732,18 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, uint len)
if ((as4 != asn) && (asn != AS_TRANS))
log(L_WARN "%s: Peer advertised inconsistent AS numbers", p->p.name);
if (as4 != p->remote_as)
/* When remote ASN is unspecified, it must be external one */
if (p->remote_as ? (as4 != p->remote_as) : (as4 == p->local_as))
{ as4 = htonl(as4); bgp_error(conn, 2, 2, (byte *) &as4, 4); return; }
conn->received_as = as4;
}
else
{
if (asn != p->remote_as)
if (p->remote_as ? (asn != p->remote_as) : (asn == p->local_as))
{ bgp_error(conn, 2, 2, pkt+20, 2); return; }
conn->received_as = asn;
}
/* Check the other connection */