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[NETFILTER]: TCP conntrack: improve dead connection detection 

Don't count window updates as retransmissions.

Signed-off-by: George Hansper <georgeh@anstat.com.au>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
George Hansper 2006-09-20 12:03:23 -07:00 committed by David S. Miller
parent 71cd83a8bd
commit c1fe3ca510
3 changed files with 7 additions and 2 deletions
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1
include/linux/netfilter/nf_conntrack_tcp.h
View File

@ -49,6 +49,7 @@ struct ip_ct_tcp
u_int32_t last_seq; /* Last sequence number seen in dir */
u_int32_t last_ack; /* Last sequence number seen in opposite dir */
u_int32_t last_end; /* Last seq + len */
u_int16_t last_win; /* Last window advertisement seen in dir */
};
#endif /* __KERNEL__ */

4
net/ipv4/netfilter/ip_conntrack_proto_tcp.c
View File

@ -731,13 +731,15 @@ static int tcp_in_window(struct ip_ct_tcp *state,
if (state->last_dir == dir
&& state->last_seq == seq
&& state->last_ack == ack
&& state->last_end == end)
&& state->last_end == end
&& state->last_win == win)
state->retrans++;
else {
state->last_dir = dir;
state->last_seq = seq;
state->last_ack = ack;
state->last_end = end;
state->last_win = win;
state->retrans = 0;
}
}

4
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -688,13 +688,15 @@ static int tcp_in_window(struct ip_ct_tcp *state,
if (state->last_dir == dir
&& state->last_seq == seq
&& state->last_ack == ack
&& state->last_end == end)
&& state->last_end == end
&& state->last_win == win)
state->retrans++;
else {
state->last_dir = dir;
state->last_seq = seq;
state->last_ack = ack;
state->last_end = end;
state->last_win = win;
state->retrans = 0;
}
}