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bgpd: Do not send next-hop as :: in MP_REACH_NLRI if no link-local exists

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This is the unusual case when you have global IPv6 address and no link-local
on interface attached. Like here:

eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
 link/ether 08:00:27:65:c6:82 brd ff:ff:ff:ff:ff:ff
 inet6 2a02:4780:face::1/64 scope global
    valid_lft forever preferred_lft forever

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>
This commit is contained in:
Donatas Abraitis 2019-09-06 12:12:23 +03:00
parent 514f508fc6
commit 33038f887d
1 changed files with 7 additions and 3 deletions
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10
bgpd/bgp_route.c
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@ -1752,18 +1752,22 @@ int subgroup_announce_check(struct bgp_node *rn, struct bgp_path_info *pi,
* if
* the peer (group) is configured to receive link-local nexthop
* unchanged
* and it is available in the prefix OR we're not reflecting the route
* and
* and it is available in the prefix OR we're not reflecting the route,
* link-local nexthop address is valid and
* the peer (group) to whom we're going to announce is on a shared
* network
* and this is either a self-originated route or the peer is EBGP.
* By checking if nexthop LL address is valid we are sure that
* we do not announce LL address as `::`.
*/
if (NEXTHOP_IS_V6) {
attr->mp_nexthop_len = BGP_ATTR_NHLEN_IPV6_GLOBAL;
if ((CHECK_FLAG(peer->af_flags[afi][safi],
PEER_FLAG_NEXTHOP_LOCAL_UNCHANGED)
&& IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local))
|| (!reflect && peer->shared_network
|| (!reflect
&& IN6_IS_ADDR_LINKLOCAL(&peer->nexthop.v6_local)
&& peer->shared_network
&& (from == bgp->peer_self
|| peer->sort == BGP_PEER_EBGP))) {
attr->mp_nexthop_len =