netdev - [RFC PATCH net-next v1 1/3] net: route: expire rt if the dst it holds is expired

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Message-ID: <a6c0b46e-e5c1-4aec-b2e1-8bf610fe98fb@gmail.com>
Date: Thu, 25 Jan 2024 14:12:39 +0100
From: Leone Fernando <leone4fernando@...il.com>
To: dennis@...nel.org, tj@...nel.org, cl@...ux.com, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [RFC PATCH net-next v1 1/3] 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 16615d107cf0..7c5e68117ee2 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -392,7 +392,8 @@ 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