linux-kernel - [PATCH] netfilter/ipvs: expire no destination UDP connections when expire_nodest

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Date:   Thu, 14 May 2020 21:35:56 -0400
From:   Andrew Sy Kim <kim.andrewsy@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     kim.andrewsy@...il.com, Wensong Zhang <wensong@...ux-vs.org>,
        Simon Horman <horms@...ge.net.au>,
        Julian Anastasov <ja@....bg>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org (open list:IPVS),
        lvs-devel@...r.kernel.org (open list:IPVS),
        netfilter-devel@...r.kernel.org (open list:NETFILTER),
        coreteam@...filter.org (open list:NETFILTER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] netfilter/ipvs: expire no destination UDP connections when expire_nodest_conn=1

When expire_nodest_conn=1 and an IPVS destination is deleted, IPVS
doesn't expire connections with the IP_VS_CONN_F_ONE_PACKET flag set (any
UDP connection). If there are many UDP packets to a virtual server from a
single client and a destination is deleted, many packets are silently
dropped whenever an existing connection entry with the same source port
exists. This patch ensures IPVS also expires UDP connections when a
packet matches an existing connection with no destinations.

Signed-off-by: Andrew Sy Kim <kim.andrewsy@...il.com>
---
 net/netfilter/ipvs/ip_vs_core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index aa6a603a2425..f0535586fe75 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -2116,8 +2116,7 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int
 		else
 			ip_vs_conn_put(cp);
 
-		if (sysctl_expire_nodest_conn(ipvs) &&
-		    !(flags & IP_VS_CONN_F_ONE_PACKET)) {
+		if (sysctl_expire_nodest_conn(ipvs)) {
 			/* try to expire the connection immediately */
 			ip_vs_conn_expire_now(cp);
 		}
-- 
2.20.1