From e9b90dfac2225927c035f6a76277b850c282dc9a Mon Sep 17 00:00:00 2001 From: Yousong Zhou Date: Fri, 24 Jul 2020 12:52:59 +0800 Subject: [PATCH] zones: apply tcp mss clamping also on ingress path Fixes FS#3231 Signed-off-by: Yousong Zhou Acked-by: Jo-Philipp Wich --- zones.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/zones.c b/zones.c index 68b02ab..d45077a 100644 --- a/zones.c +++ b/zones.c @@ -580,6 +580,14 @@ print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state, fw3_ipt_rule_target(r, "TCPMSS"); fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL); fw3_ipt_rule_replace(r, "FORWARD"); + + r = fw3_ipt_rule_create(handle, &tcp, dev, NULL, sub, NULL); + fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST"); + fw3_ipt_rule_addarg(r, false, "SYN", NULL); + fw3_ipt_rule_comment(r, "Zone %s MTU fixing", zone->name); + fw3_ipt_rule_target(r, "TCPMSS"); + fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL); + fw3_ipt_rule_replace(r, "FORWARD"); } } else if (handle->table == FW3_TABLE_RAW) -- 2.30.2