1 From 4a7df7d8c4e40fd2ce0d9f125755249dee17a8bd Mon Sep 17 00:00:00 2001
2 From: Yousong Zhou <yszhou4tech@gmail.com>
3 Date: Fri, 24 Jul 2020 12:52:59 +0800
4 Subject: [PATCH] zones: apply tcp mss clamping also on ingress path
8 Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
9 Acked-by: Jo-Philipp Wich <jo@mein.io>
10 (cherry picked from commit e9b90dfac2225927c035f6a76277b850c282dc9a)
13 1 file changed, 8 insertions(+)
15 diff --git a/zones.c b/zones.c
16 index 01fb706..3d54a76 100644
19 @@ -552,6 +552,14 @@ print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
20 fw3_ipt_rule_target(r, "TCPMSS");
21 fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
22 fw3_ipt_rule_replace(r, "FORWARD");
24 + r = fw3_ipt_rule_create(handle, &tcp, dev, NULL, sub, NULL);
25 + fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
26 + fw3_ipt_rule_addarg(r, false, "SYN", NULL);
27 + fw3_ipt_rule_comment(r, "Zone %s MTU fixing", zone->name);
28 + fw3_ipt_rule_target(r, "TCPMSS");
29 + fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
30 + fw3_ipt_rule_replace(r, "FORWARD");
33 else if (handle->table == FW3_TABLE_RAW)