From 648106c30a635e18fb55da60d4fcbfca6f6483ac Mon Sep 17 00:00:00 2001
From: Amit Cohen <amcohen@nvidia.com>
Date: Sun, 7 Feb 2021 10:22:51 +0200
Subject: IPv4: Extend 'fib_notify_on_flag_change' sysctl

Add the value '2' to 'fib_notify_on_flag_change' to allow sending
notifications only for failed route installation.

Separate value is added for such notifications because there are less of
them, so they do not impact performance and some users will find them more
important.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/fib_trie.c        | 6 ++++++
 net/ipv4/sysctl_net_ipv4.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

(limited to 'net/ipv4')

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 80147caa9bfd..25cf387cca5b 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1053,6 +1053,12 @@ void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri)
 
 	fa_match->offload = fri->offload;
 	fa_match->trap = fri->trap;
+
+	/* 2 means send notifications only if offload_failed was changed. */
+	if (net->ipv4.sysctl_fib_notify_on_flag_change == 2 &&
+	    fa_match->offload_failed == fri->offload_failed)
+		goto out;
+
 	fa_match->offload_failed = fri->offload_failed;
 
 	if (!net->ipv4.sysctl_fib_notify_on_flag_change)
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index e5798b3b59d2..f55095d3ed16 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -1361,7 +1361,7 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_ONE,
+		.extra2		= &two,
 	},
 	{ }
 };
-- 
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