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#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);
}
extern int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
s32 off);
extern int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
__be32 seq, s32 off);
extern void nf_ct_tcp_seqadj_set(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
s32 off);
extern int nf_ct_seq_adjust(struct sk_buff *skb,
struct nf_conn *ct, enum ip_conntrack_info ctinfo,
unsigned int protoff);
extern s32 nf_ct_seq_offset(const struct nf_conn *ct, enum ip_conntrack_dir,
u32 seq);
extern int nf_conntrack_seqadj_init(void);
extern void nf_conntrack_seqadj_fini(void);
#endif /* _NF_CONNTRACK_SEQADJ_H */
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