linux-kernel - [PATCH net-next v2 1/4] net: route: expire rt if the dst it holds is expired

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Message-Id: <20240702142406.465415-2-leone4fernando@gmail.com>
Date: Tue,  2 Jul 2024 16:24:03 +0200
From: Leone Fernando <leone4fernando@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	dsahern@...nel.org,
	willemb@...gle.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leone Fernando <leone4fernando@...il.com>
Subject: [PATCH net-next v2 1/4] net: route: expire rt if the dst it holds is expired

The function rt_is_expired is used to verify that a cached dst is valid.
Currently, this function ignores the rt.dst->expires value.

Add a check to rt_is_expired that validates that the dst is not expired.

Signed-off-by: Leone Fernando <leone4fernando@...il.com>
---
 net/ipv4/route.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 54512acbead7..fd0883da7834 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -390,7 +390,8 @@ static inline int ip_rt_proc_init(void)
 
 static inline bool rt_is_expired(const struct rtable *rth)
 {
-	return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev));
+	return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)) ||
+	       (rth->dst.expires && time_after(jiffies, rth->dst.expires));
 }
 
 void rt_cache_flush(struct net *net)
-- 
2.34.1