LXR linux/include/net/netfilter/nf_conntrack

   1#ifndef _NF_CONNTRACK_SEQADJ_H
   2#define _NF_CONNTRACK_SEQADJ_H
   3
   4#include <net/netfilter/nf_conntrack_extend.h>
   5
   6/**
   7 * struct nf_ct_seqadj - sequence number adjustment information
   8 *
   9 * @correction_pos: position of the last TCP sequence number modification
  10 * @offset_before: sequence number offset before last modification
  11 * @offset_after: sequence number offset after last modification
  12 */
  13struct nf_ct_seqadj {
  14        u32             correction_pos;
  15        s32             offset_before;
  16        s32             offset_after;
  17};
  18
  19struct nf_conn_seqadj {
  20        struct nf_ct_seqadj     seq[IP_CT_DIR_MAX];
  21};
  22
  23static inline struct nf_conn_seqadj *nfct_seqadj(const struct nf_conn *ct)
  24{
  25        return nf_ct_ext_find(ct, NF_CT_EXT_SEQADJ);
  26}
  27
  28static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct)
  29{
  30        return nf_ct_ext_add(ct, NF_CT_EXT_SEQADJ, GFP_ATOMIC);
  31}
  32
  33int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
  34                      s32 off);
  35int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
  36                     __be32 seq, s32 off);
  37void nf_ct_tcp_seqadj_set(struct sk_buff *skb, struct nf_conn *ct,
  38                          enum ip_conntrack_info ctinfo, s32 off);
  39
  40int nf_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
  41                     enum ip_conntrack_info ctinfo, unsigned int protoff);
  42s32 nf_ct_seq_offset(const struct nf_conn *ct, enum ip_conntrack_dir, u32 seq);
  43
  44int nf_conntrack_seqadj_init(void);
  45void nf_conntrack_seqadj_fini(void);
  46
  47#endif /* _NF_CONNTRACK_SEQADJ_H */
  48