neigh: support to add fdb entry

[wangli8850]

rtnl_neigh.n_family should be set as AF_BRIDGE when we want to add a fdb entry, but the func build_neigh_msg does not allow dst addr to be put at that time.

Here is the example: struct rtnl_neigh neigh = rtnl_neigh_alloc(); struct nl_addr mac = nl_addr_build(AF_LLC, eth, ETH_ALEN); struct nl_addr *dst = nl_addr_build(AF_INET, addr, 4);

rtnl_neigh_set_ifindex(neigh, rtnl_link_get_ifindex(vxlan_link));
rtnl_neigh_set_state(neigh, NUD_NOARP | NUD_PERMANENT);
rtnl_neigh_set_lladdr(neigh, mac);
rtnl_neigh_set_flags(neigh, NTF_SELF);
rtnl_neigh_set_dst(neigh, dst);
rtnl_neigh_set_family(neigh, AF_BRIDGE);

rtnl_neigh_add(sk, neigh, NLM_F_CREATE);

Then command "bridge fdb show" will print out the fdb entry: 02:68:60:19:6b:a4 dev flannel.1 dst 10.40.252.12 self permanent

Signed-off-by: huangxuesen huangxuesen@kuaishou.com Signed-off-by: wangli09 wangli09@kuaishou.com

[thom311]

merged.

Thank you!!