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bgpd: Only supply ifindex for a v6 nexthop if LL

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BGP is calculating a v6 routes nexthop as the nexthop address
+ an ifindex.  The ifindex calculated comes from where we received
the route from as that we have to do this for LL addresses.

But a v6 address that is not a LL we do not need to provide
to zebra for nexthop resolution because a global address
by default can be looked up and resolved appropriately.

Modify the code so that we must have an ifindex for a v6 nexthop
if the address is LL, else don't pass the ifindex down to zebra.

Fixes: #1986
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2018-03-29 11:43:49 -04:00
parent 615e608d76
commit d4f8783d95
1 changed files with 8 additions and 3 deletions
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11
bgpd/bgp_zebra.c
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@ -1197,12 +1197,17 @@ void bgp_zebra_announce(struct bgp_node *rn, struct prefix *p,
ifindex = mpinfo->peer->nexthop.ifp ifindex = mpinfo->peer->nexthop.ifp
->ifindex; ->ifindex;
} }
if (ifindex == 0)
continue; if (IN6_IS_ADDR_LINKLOCAL(nexthop)) {
if (ifindex == 0)
continue;
} else
ifindex = 0;
api_nh->gate.ipv6 = *nexthop; api_nh->gate.ipv6 = *nexthop;
api_nh->ifindex = ifindex; api_nh->ifindex = ifindex;
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX; api_nh->type = ifindex ? NEXTHOP_TYPE_IPV6_IFINDEX
: NEXTHOP_TYPE_IPV6;
} }
if (mpinfo->extra if (mpinfo->extra