From c1fe3ca5106d9568791433fa6c7f27e71ac69e1b Mon Sep 17 00:00:00 2001 From: George Hansper Date: Wed, 20 Sep 2006 12:03:23 -0700 Subject: [PATCH] [NETFILTER]: TCP conntrack: improve dead connection detection Don't count window updates as retransmissions. Signed-off-by: George Hansper Signed-off-by: Patrick McHardy --- include/linux/netfilter/nf_conntrack_tcp.h | 1 + net/ipv4/netfilter/ip_conntrack_proto_tcp.c | 4 +++- net/netfilter/nf_conntrack_proto_tcp.c | 4 +++- 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/netfilter/nf_conntrack_tcp.h b/include/linux/netfilter/nf_conntrack_tcp.h index b2feeffde384..6b01ba297727 100644 --- a/include/linux/netfilter/nf_conntrack_tcp.h +++ b/include/linux/netfilter/nf_conntrack_tcp.h @@ -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__ */ diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c index 75a7237eb8c1..03ae9a04cb37 100644 --- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c +++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c @@ -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; } } diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 9fc0ee61f92a..238bbb5b72ef 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -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; } } -- 2.34.1