[PATCH net-next 4/9] ipv4: Notify newly added route if should be offloaded

[Ido Schimmel <idosch@idosch.org>]

From: Ido Schimmel <idosch@mellanox.com>

When a route is added, it should only be notified in case it is the
first route in the FIB alias list with the given {prefix, prefix length,
table ID}. Otherwise, it is not used in the data path and should not be
considered by switch drivers.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
---
 net/ipv4/fib_trie.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 6822aa90657a..66c7926d027d 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1311,6 +1311,16 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
 	if (WARN_ON_ONCE(!l))
 		goto out_free_new_fa;
 
+	if (fib_find_first_alias(&l->leaf, new_fa->fa_slen, tb->tb_id) ==
+	    new_fa) {
+		enum fib_event_type fib_event;
+
+		fib_event = FIB_EVENT_ENTRY_REPLACE_TMP;
+		err = call_fib_entry_notifiers(net, fib_event, key, plen,
+					       new_fa, extack);
+		if (err)
+			goto out_remove_new_fa;
+	}
 	err = call_fib_entry_notifiers(net, event, key, plen, new_fa, extack);
 	if (err)
 		goto out_remove_new_fa;
-- 
2.23.0