Revert "ipv4/fib: send notify when delete source address routes"

This reverts commit 5b7cae7c35 which is
commit 4b2b606075e50cdae62ab2356b0a1e206947c354 upstream.

It breaks the android ABI and if this is needed in the future, can be
brought back in an abi-safe way.

Bug: 161946584
Change-Id: I445b109db38243faa7154021212e3f7ca0ad820f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

include/net/ip_fib.h

@@ -151,7 +151,6 @@ struct fib_info {
 	int			fib_nhs;
 	bool			fib_nh_is_v6;
 	bool			nh_updated;
-	bool			pfsrc_removed;
 	struct nexthop		*nh;
 	struct rcu_head		rcu;
 	struct fib_nh		fib_nh[];

net/ipv4/fib_semantics.c

@@ -1908,7 +1908,6 @@ int fib_sync_down_addr(struct net_device *dev, __be32 local)
 			continue;
 		if (fi->fib_prefsrc == local) {
 			fi->fib_flags |= RTNH_F_DEAD;
-			fi->pfsrc_removed = true;
 			ret++;
 		}
 	}

net/ipv4/fib_trie.c

@@ -1977,7 +1977,6 @@ void fib_table_flush_external(struct fib_table *tb)
 int fib_table_flush(struct net *net, struct fib_table *tb, bool flush_all)
 {
 	struct trie *t = (struct trie *)tb->tb_data;
-	struct nl_info info = { .nl_net = net };
 	struct key_vector *pn = t->kv;
 	unsigned long cindex = 1;
 	struct hlist_node *tmp;
@@ -2040,9 +2039,6 @@ int fib_table_flush(struct net *net, struct fib_table *tb, bool flush_all)
 
 			fib_notify_alias_delete(net, n->key, &n->leaf, fa,
 						NULL);
-			if (fi->pfsrc_removed)
-				rtmsg_fib(RTM_DELROUTE, htonl(n->key), fa,
-					  KEYLENGTH - fa->fa_slen, tb->tb_id, &info, 0);
 			hlist_del_rcu(&fa->fa_list);
 			fib_release_info(fa->fa_info);
 			alias_free_mem_rcu(fa);