linux/net/netfilter/nf_conntrack_seqadj.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/types.h>
#include <linux/netfilter.h>
#include <net/tcp.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_seqadj.h>

int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
		      s32 off)
{ … }
EXPORT_SYMBOL_GPL(…);

int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
		     __be32 seq, s32 off)
{ … }
EXPORT_SYMBOL_GPL(…);

void nf_ct_tcp_seqadj_set(struct sk_buff *skb,
			  struct nf_conn *ct, enum ip_conntrack_info ctinfo,
			  s32 off)
{ … }
EXPORT_SYMBOL_GPL(…);

/* Adjust one found SACK option including checksum correction */
static void nf_ct_sack_block_adjust(struct sk_buff *skb,
				    struct tcphdr *tcph,
				    unsigned int sackoff,
				    unsigned int sackend,
				    struct nf_ct_seqadj *seq)
{ … }

/* TCP SACK sequence number adjustment */
static unsigned int nf_ct_sack_adjust(struct sk_buff *skb,
				      unsigned int protoff,
				      struct nf_conn *ct,
				      enum ip_conntrack_info ctinfo)
{ … }

/* TCP sequence number adjustment.  Returns 1 on success, 0 on failure */
int nf_ct_seq_adjust(struct sk_buff *skb,
		     struct nf_conn *ct, enum ip_conntrack_info ctinfo,
		     unsigned int protoff)
{ … }
EXPORT_SYMBOL_GPL(…);

s32 nf_ct_seq_offset(const struct nf_conn *ct,
		     enum ip_conntrack_dir dir,
		     u32 seq)
{ … }
EXPORT_SYMBOL_GPL(…);