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1.x: nl_bridge: properly handle L2 neighbors moving between ports #458

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1.x: nl_bridge: properly handle L2 neighbors moving between ports #458

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0a4261f
nl_bridge::fdb_timeout(): check ifindex of hit before deletion
KanjiMonster Sep 18, 2023
da2efd9
nl_bridge::add_neigh_to_fdb(): remove old cache item on update
KanjiMonster Sep 18, 2023
1ac2438
nl_bridge: fix removing aged out neighbors from fdb
KanjiMonster Mar 7, 2024
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14 changes: 8 additions & 6 deletions src/netlink/nl_bridge.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -722,8 +722,11 @@ void nl_bridge::add_neigh_to_fdb(rtnl_neigh *neigh, bool update) {
NEIGH_CAST(nl_cache_search(l2_cache.get(), OBJ_CAST(n.get()))),
rtnl_neigh_put);

if (n_lookup && rtnl_neigh_get_ifindex(n_lookup.get()) == ifindex) {
return;
if (n_lookup) {
if (rtnl_neigh_get_ifindex(n_lookup.get()) == ifindex)
return;

nl_cache_remove(OBJ_CAST(n_lookup.get()));
}
rtnl_neigh_set_ifindex(n.get(), ifindex);

Expand Down Expand Up @@ -824,23 +827,22 @@ int nl_bridge::fdb_timeout(rtnl_link *br_link, uint16_t vid,
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) {
if (n_lookup && rtnl_neigh_get_ifindex(n_lookup.get()) ==
rtnl_link_get_ifindex(br_link)) {
// * remove l2 entry from kernel
nl_msg *msg = nullptr;
rtnl_neigh_build_delete_request(n.get(), NLM_F_REQUEST, &msg);
rtnl_neigh_build_delete_request(n_lookup.get(), NLM_F_REQUEST, &msg);
assert(msg);

// send the message and create new fdb entry
Expand Down