Each nexthop group contains an indication if it has IPv4 nexthops
('has_v4'). Its purpose is to prevent IPv6 routes from using groups with
IPv4 nexthops.
However, the indication is not updated when a nexthop is removed. This
results in the kernel wrongly rejecting IPv6 routes from pointing to
groups that only contain IPv6 nexthops. Example:
# ip nexthop replace id 1 via 192.0.2.2 dev dummy10
# ip nexthop replace id 2 via 2001:db8:1::2 dev dummy10
# ip nexthop replace id 10 group 1/2
# ip nexthop del id 1
# ip route replace 2001:db8:10::/64 nhid 10
Error: IPv6 routes can not use an IPv4 nexthop.
Solve this by updating the indication according to the new set of
member nexthops.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
return;
}
- newg->has_v4 = nhg->has_v4;
+ newg->has_v4 = false;
newg->mpath = nhg->mpath;
newg->fdb_nh = nhg->fdb_nh;
newg->num_nh = nhg->num_nh;
nhges = nhg->nh_entries;
new_nhges = newg->nh_entries;
for (i = 0, j = 0; i < nhg->num_nh; ++i) {
+ struct nh_info *nhi;
+
/* current nexthop getting removed */
if (nhg->nh_entries[i].nh == nh) {
newg->num_nh--;
continue;
}
+ nhi = rtnl_dereference(nhges[i].nh->nh_info);
+ if (nhi->family == AF_INET)
+ newg->has_v4 = true;
+
list_del(&nhges[i].nh_list);
new_nhges[j].nh_parent = nhges[i].nh_parent;
new_nhges[j].nh = nhges[i].nh;