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kernel: fix regression on 4.19 with 613-netfilter_optional_tcp_window_check.patch (FS#2253)

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Since ct->proto.tcp.last_win isn't updated when nf_ct_tcp_no_window_check is
enabled, the retransmission timeout check needs to be bypassed.

Based on patch by Rob Mosher

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-04-27 18:56:30 +02:00
parent 17cb490ac4
commit 9af2735734
1 changed files with 9 additions and 0 deletions
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9
target/linux/generic/pending-4.19/613-netfilter_optional_tcp_window_check.patch
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@ -28,6 +28,15 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
/*
* Get the required data from the packet.
*/
@@ -1057,7 +1063,7 @@ static int tcp_packet(struct nf_conn *ct
IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED &&
timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK])
timeout = timeouts[TCP_CONNTRACK_UNACK];
- else if (ct->proto.tcp.last_win == 0 &&
+ else if (!nf_ct_tcp_no_window_check && ct->proto.tcp.last_win == 0 &&
timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS])
timeout = timeouts[TCP_CONNTRACK_RETRANS];
else
@@ -1506,6 +1512,13 @@ static struct ctl_table tcp_sysctl_table
.mode = 0644,
.proc_handler = proc_dointvec,