include/linux/netfilter/nf_conntrack_sip.h

   1 #ifndef __NF_CONNTRACK_SIP_H__
   2 #define __NF_CONNTRACK_SIP_H__
   3 #ifdef __KERNEL__
   4
   5 #define SIP_PORT        5060
   6 #define SIP_TIMEOUT     3600
   7
   8 enum sip_header_pos {
   9         POS_REG_REQ_URI,
  10         POS_REQ_URI,
  11         POS_FROM,
  12         POS_TO,
  13         POS_VIA,
  14         POS_CONTACT,
  15         POS_CONTENT,
  16 };
  17
  18 struct sip_header {
  19         const char      *name;
  20         const char      *cname;
  21         const char      *search;
  22         unsigned int    len;
  23         unsigned int    clen;
  24         unsigned int    slen;
  25         int             (*match_len)(const struct nf_conn *ct,
  26                                      const char *dptr, const char *limit,
  27                                      int *shift);
  28 };
  29
  30 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  31 {                                                                       \
  32         .name           = (__name),                                     \
  33         .len            = sizeof(__name) - 1,                           \
  34         .cname          = (__cname),                                    \
  35         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  36         .search         = (__search),                                   \
  37         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  38         .match_len      = (__match),                                    \
  39 }
  40
  41 #define SDP_HDR(__name, __search, __match) \
  42         __SIP_HDR(__name, NULL, __search, __match)
  43
  44 enum sdp_header_types {
  45         SDP_HDR_UNSPEC,
  46         SDP_HDR_VERSION,
  47         SDP_HDR_OWNER_IP4,
  48         SDP_HDR_CONNECTION_IP4,
  49         SDP_HDR_OWNER_IP6,
  50         SDP_HDR_CONNECTION_IP6,
  51         SDP_HDR_MEDIA,
  52 };
  53
  54 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
  55                                        const char **dptr,
  56                                        unsigned int *datalen);
  57 extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
  58                                        const char **dptr,
  59                                        unsigned int *datalen,
  60                                        struct nf_conntrack_expect *exp);
  61
  62 extern int ct_sip_get_info(const struct nf_conn *ct, const char *dptr,
  63                            size_t dlen, unsigned int *matchoff,
  64                            unsigned int *matchlen, enum sip_header_pos pos);
  65 extern int ct_sip_lnlen(const char *line, const char *limit);
  66 extern const char *ct_sip_search(const char *needle, const char *haystack,
  67                                  size_t needle_len, size_t haystack_len,
  68                                  int case_sensitive);
  69
  70 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
  71                                  unsigned int dataoff, unsigned int datalen,
  72                                  enum sdp_header_types type,
  73                                  enum sdp_header_types term,
  74                                  unsigned int *matchoff, unsigned int *matchlen);
  75
  76 #endif /* __KERNEL__ */
  77 #endif /* __NF_CONNTRACK_SIP_H__ */