From a8708aa9fe1095ca7859cb3f102b6a3fa0fb98bd Mon Sep 17 00:00:00 2001 From: Fernando Fernandez Mancera Date: Wed, 19 Aug 2026 12:24:08 +0200 Subject: netfilter: synproxy: fix reset of ct seqadj when reopening a connection SYNPROXY is resetting conntrack seqadj when a closed connection is re-opened, but it was using nf_ct_seqadj_init() which is a no-op for a zero offset. This patch introduces nf_ct_seqadj_reset() which sets the offset values directly to zero and avoid setting IPS_SEQ_ADJUST_BIT flag, it changes SYNPROXY code to use it when needed. Fixes: 48b1de4c110a ("netfilter: add SYNPROXY core/target") Signed-off-by: Fernando Fernandez Mancera Signed-off-by: Pablo Neira Ayuso --- include/net/netfilter/nf_conntrack_seqadj.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/net/netfilter/nf_conntrack_seqadj.h b/include/net/netfilter/nf_conntrack_seqadj.h index 883c414b768e..0f5bbb14a25a 100644 --- a/include/net/netfilter/nf_conntrack_seqadj.h +++ b/include/net/netfilter/nf_conntrack_seqadj.h @@ -33,6 +33,7 @@ static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct) int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo, s32 off); +void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo); int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo, __be32 seq, s32 off); void nf_ct_tcp_seqadj_set(struct sk_buff *skb, struct nf_conn *ct, -- cgit v1.2.3