/**
* Delete a neighbour
* @arg handle netlink handle
* @arg neigh neighbour to delete
*
* Builds a netlink message by calling rtnl_neigh_build_delete_request(),
* sends the request to the kernel and waits for the next ACK to be
* received and thus blocks until the request has been fullfilled.
*
* @return 0 on sucess or a negative error if an error occured.
*/
int rtnl_neigh_delete(struct nl_handle *handle, struct rtnl_neigh *neigh)
{
int err;
struct nl_msg *m = rtnl_neigh_build_delete_request(neigh);
if ((err = nl_send_auto_complete(handle, nl_msg_get(m))) < 0)
return err;
nl_msg_free(m);
return nl_wait_for_ack(handle);
}
int nl_bridge::fdb_timeout(rtnl_link *br_link, uint16_t vid,
const rofl::caddress_ll &mac) {
int rv = 0;
std::unique_ptr<rtnl_neigh, decltype(&rtnl_neigh_put)> n(rtnl_neigh_alloc(),
rtnl_neigh_put);
std::unique_ptr<nl_addr, decltype(&nl_addr_put)> h_src(
nl_addr_build(AF_LLC, mac.somem(), mac.memlen()), nl_addr_put);
rtnl_neigh_set_ifindex(n.get(), rtnl_link_get_ifindex(br_link));
rtnl_neigh_set_master(n.get(), rtnl_link_get_master(br_link));
rtnl_neigh_set_family(n.get(), AF_BRIDGE);
rtnl_neigh_set_vlan(n.get(), vid);
rtnl_neigh_set_lladdr(n.get(), h_src.get());
rtnl_neigh_set_flags(n.get(), NTF_MASTER | NTF_EXT_LEARNED);
rtnl_neigh_set_state(n.get(), NUD_REACHABLE);
// find entry in local l2_cache
std::unique_ptr<rtnl_neigh, decltype(&rtnl_neigh_put)> n_lookup(
NEIGH_CAST(nl_cache_search(l2_cache.get(), OBJ_CAST(n.get()))),
rtnl_neigh_put);
if (n_lookup) {
// * remove l2 entry from kernel
nl_msg *msg = nullptr;
rtnl_neigh_build_delete_request(n.get(), NLM_F_REQUEST, &msg);
assert(msg);
// send the message and create new fdb entry
if (nl->send_nl_msg(msg) < 0) {
LOG(ERROR) << __FUNCTION__ << ": failed to send netlink message";
return -EINVAL;
}
// XXX TODO maybe delete after NL event and not yet here
nl_cache_remove(OBJ_CAST(n_lookup.get()));
}
return rv;
}
