include/net/netfilter/nf_conntrack_seqadj.h

   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  */
  13 struct nf_ct_seqadj {
  14         u32             correction_pos;
  15         s32             offset_before;
  16         s32             offset_after;
  17 };
  18
  19 struct nf_conn_seqadj {
  20         struct nf_ct_seqadj     seq[IP_CT_DIR_MAX];
  21 };
  22
  23 static 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
  28 static 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
  33 extern int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
  34                              s32 off);
  35 extern int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
  36                             __be32 seq, s32 off);
  37 extern void nf_ct_tcp_seqadj_set(struct sk_buff *skb,
  38                                  struct nf_conn *ct,
  39                                  enum ip_conntrack_info ctinfo,
  40                                  s32 off);
  41
  42 extern int nf_ct_seq_adjust(struct sk_buff *skb,
  43                             struct nf_conn *ct, enum ip_conntrack_info ctinfo,
  44                             unsigned int protoff);
  45 extern s32 nf_ct_seq_offset(const struct nf_conn *ct, enum ip_conntrack_dir,
  46                             u32 seq);
  47
  48 extern int nf_conntrack_seqadj_init(void);
  49 extern void nf_conntrack_seqadj_fini(void);
  50
  51 #endif /* _NF_CONNTRACK_SEQADJ_H */