linux/include/net/netfilter/nf_conntrack_seqadj.h

/* 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 { … };

struct nf_conn_seqadj { … };

static inline struct nf_conn_seqadj *nfct_seqadj(const struct nf_conn *ct)
{ … }

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);
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 */