linux-kernel - [PATCH 1/1] netfilter: Added nfct_seqadj_ext

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Message-ID: <20251014114334.4167561-1-a.melnychenko@vyos.io>
Date: Tue, 14 Oct 2025 13:43:34 +0200
From: Andrii Melnychenko <a.melnychenko@...s.io>
To: pablo@...filter.org,
	kadlec@...filter.org,
	fw@...len.de,
	phil@....cc
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	netfilter-devel@...r.kernel.org,
	coreteam@...filter.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] netfilter: Added nfct_seqadj_ext_add() for ftp's conntrack.

There was an issue with NAT'ed ftp and replaced messages
for PASV/EPSV mode. "New" IP in the message may have a
different length that would require sequence adjustment.

Signed-off-by: Andrii Melnychenko <a.melnychenko@...s.io>
---
 net/netfilter/nf_conntrack_ftp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 617f744a2..555ff77f4 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -390,6 +390,8 @@ static int help(struct sk_buff *skb,
 	/* Until there's been traffic both ways, don't look in packets. */
 	if (ctinfo != IP_CT_ESTABLISHED &&
 	    ctinfo != IP_CT_ESTABLISHED_REPLY) {
+		if (!nf_ct_is_confirmed(ct))
+			nfct_seqadj_ext_add(ct);
 		pr_debug("ftp: Conntrackinfo = %u\n", ctinfo);
 		return NF_ACCEPT;
 	}
-- 
2.43.0