1 files changed, 45 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_seqadj.h b/include/net/netfilter/nf_conntrack_seqadj.h
new file mode 100644
index 000000000..883c414b7
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_seqadj.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_SEQADJ_H
+#define _NF_CONNTRACK_SEQADJ_H
+
+#include <net/netfilter/nf_conntrack_extend.h>
+
+/**
+ * struct nf_ct_seqadj - sequence number adjustment information
+ *
+ * @correction_pos: position of the last TCP sequence number modification
+ * @offset_before: sequence number offset before last modification
+ * @offset_after: sequence number offset after last modification
+ */
+struct nf_ct_seqadj {
+	u32		correction_pos;
+	s32		offset_before;
+	s32		offset_after;
+};
+
+struct nf_conn_seqadj {
+	struct nf_ct_seqadj	seq[IP_CT_DIR_MAX];
+};
+
+static inline struct nf_conn_seqadj *nfct_seqadj(const struct nf_conn *ct)
+{
+	return nf_ct_ext_find(ct, NF_CT_EXT_SEQADJ);
+}
+
+static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct)
+{
+	return nf_ct_ext_add(ct, NF_CT_EXT_SEQADJ, GFP_ATOMIC);
+}
+
+int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+		      s32 off);
+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,
+			  enum ip_conntrack_info ctinfo, s32 off);
+
+int nf_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
+		     enum ip_conntrack_info ctinfo, unsigned int protoff);
+s32 nf_ct_seq_offset(const struct nf_conn *ct, enum ip_conntrack_dir, u32 seq);
+
+#endif /* _NF_CONNTRACK_SEQADJ_H */