[PATCH 3/4] ipvs: allow rescheduling after RST

To: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Subject: [PATCH 3/4] ipvs: allow rescheduling after RST
Cc: lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, Wensong Zhang <wensong@xxxxxxxxxxxx>, Julian Anastasov <ja@xxxxxx>, Simon Horman <horms@xxxxxxxxxxxx>
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Mon, 7 Mar 2016 12:03:33 +0900
From: Julian Anastasov <ja@xxxxxx>

"RFC 5961, 4.2. Mitigation" describes a mechanism to request
client to confirm with RST the restart of TCP connection
before resending its SYN. As result, IPVS can see SYNs for
existing connection in CLOSE state. Add check to allow
rescheduling in this state.

Signed-off-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
 net/netfilter/ipvs/ip_vs_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 4da560005b0e..b9a4082afa3a 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -1089,6 +1089,7 @@ static inline bool is_new_conn_expected(const struct 
ip_vs_conn *cp,
        switch (cp->protocol) {
        case IPPROTO_TCP:
                return (cp->state == IP_VS_TCP_S_TIME_WAIT) ||
+                      (cp->state == IP_VS_TCP_S_CLOSE) ||
                        ((conn_reuse_mode & 2) &&
                         (cp->state == IP_VS_TCP_S_FIN_WAIT) &&
                         (cp->flags & IP_VS_CONN_F_NOOUTPUT));

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