netdev - [PATCH net-next 7/9] ipv4: Only Replay routes of interest to new listeners

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20191210172402.463397-8-idosch@idosch.org>
Date:   Tue, 10 Dec 2019 19:24:00 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, dsahern@...il.com,
        roopa@...ulusnetworks.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 7/9] ipv4: Only Replay routes of interest to new listeners

From: Ido Schimmel <idosch@...lanox.com>

When a new listener is registered to the FIB notification chain it
receives a dump of all the available routes in the system. Instead, make
sure to only replay the IPv4 routes that are actually used in the data
path and are of any interest to the new listener.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 net/ipv4/fib_trie.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 60947a44d363..eff45e7795ba 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2096,6 +2096,7 @@ static int fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
 			   struct netlink_ext_ack *extack)
 {
 	struct fib_alias *fa;
+	int last_slen = -1;
 	int err;
 
 	hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) {
@@ -2115,6 +2116,16 @@ static int fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
 					      fa, extack);
 		if (err)
 			return err;
+
+		if (fa->fa_slen == last_slen)
+			continue;
+
+		last_slen = fa->fa_slen;
+		err = call_fib_entry_notifier(nb, FIB_EVENT_ENTRY_REPLACE_TMP,
+					      l->key, KEYLENGTH - fa->fa_slen,
+					      fa, extack);
+		if (err)
+			return err;
 	}
 	return 0;
 }
-- 
2.23.0