[NETFILTER]: conntrack: add fixed timeout flag in connection tracking
Add a flag in a connection status to have a non updated timeout.
This permits to have connection that automatically die at a given
time.
Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter/nf_conntrack_common.h b/include/linux/netfilter/nf_conntrack_common.h
index 3ff88c8..d2e4bd7 100644
--- a/include/linux/netfilter/nf_conntrack_common.h
+++ b/include/linux/netfilter/nf_conntrack_common.h
@@ -69,6 +69,10 @@
/* Connection is dying (removed from lists), can not be unset. */
IPS_DYING_BIT = 9,
IPS_DYING = (1 << IPS_DYING_BIT),
+
+ /* Connection has fixed timeout. */
+ IPS_FIXED_TIMEOUT_BIT = 10,
+ IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
};
/* Connection tracking event bits */
diff --git a/net/ipv4/netfilter/ip_conntrack_core.c b/net/ipv4/netfilter/ip_conntrack_core.c
index a297da7..4fe9e69 100644
--- a/net/ipv4/netfilter/ip_conntrack_core.c
+++ b/net/ipv4/netfilter/ip_conntrack_core.c
@@ -1130,6 +1130,12 @@
write_lock_bh(&ip_conntrack_lock);
+ /* Only update if this is not a fixed timeout */
+ if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) {
+ write_unlock_bh(&ip_conntrack_lock);
+ return;
+ }
+
/* If not in hash table, timer will not be active yet */
if (!is_confirmed(ct)) {
ct->timeout.expires = extra_jiffies;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index f9b83f9..bc2bd4c 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1396,6 +1396,12 @@
write_lock_bh(&nf_conntrack_lock);
+ /* Only update if this is not a fixed timeout */
+ if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) {
+ write_unlock_bh(&nf_conntrack_lock);
+ return;
+ }
+
/* If not in hash table, timer will not be active yet */
if (!nf_ct_is_confirmed(ct)) {
ct->timeout.expires = extra_jiffies;