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netfilter: nf_conntrack_tcp: decrease timeouts while data in unacknowledged

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In order to time out dead connections quicker, keep track of outstanding data
and cap the timeout.

Suggested by Herbert Xu.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-07-31 00:38:01 -07:00 • committed by David S. Miller
commit ae375044d3
2 changed files with 27 additions and 5 deletions
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3
include/linux/netfilter/nf_conntrack_tcp.h
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@ -30,6 +30,9 @@ enum tcp_conntrack {
/* Be liberal in window checking */
#define IP_CT_TCP_FLAG_BE_LIBERAL 0x08
/* Has unacknowledged data */
#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED 0x10
struct nf_ct_tcp_flags {
u_int8_t flags;
u_int8_t mask;