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 struct sip_header {
   9         const char      *name;
  10         const char      *cname;
  11         const char      *search;
  12         unsigned int    len;
  13         unsigned int    clen;
  14         unsigned int    slen;
  15         int             (*match_len)(const struct nf_conn *ct,
  16                                      const char *dptr, const char *limit,
  17                                      int *shift);
  18 };
  19
  20 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  21 {                                                                       \
  22         .name           = (__name),                                     \
  23         .len            = sizeof(__name) - 1,                           \
  24         .cname          = (__cname),                                    \
  25         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  26         .search         = (__search),                                   \
  27         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  28         .match_len      = (__match),                                    \
  29 }
  30
  31 #define SIP_HDR(__name, __cname, __search, __match) \
  32         __SIP_HDR(__name, __cname, __search, __match)
  33
  34 #define SDP_HDR(__name, __search, __match) \
  35         __SIP_HDR(__name, NULL, __search, __match)
  36
  37 enum sip_header_types {
  38         SIP_HDR_FROM,
  39         SIP_HDR_TO,
  40         SIP_HDR_CONTACT,
  41         SIP_HDR_VIA,
  42         SIP_HDR_CONTENT_LENGTH,
  43 };
  44
  45 enum sdp_header_types {
  46         SDP_HDR_UNSPEC,
  47         SDP_HDR_VERSION,
  48         SDP_HDR_OWNER_IP4,
  49         SDP_HDR_CONNECTION_IP4,
  50         SDP_HDR_OWNER_IP6,
  51         SDP_HDR_CONNECTION_IP6,
  52         SDP_HDR_MEDIA,
  53 };
  54
  55 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
  56                                        const char **dptr,
  57                                        unsigned int *datalen);
  58 extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
  59                                        const char **dptr,
  60                                        unsigned int *datalen,
  61                                        struct nf_conntrack_expect *exp);
  62
  63 extern int ct_sip_parse_request(const struct nf_conn *ct,
  64                                 const char *dptr, unsigned int datalen,
  65                                 unsigned int *matchoff, unsigned int *matchlen);
  66 extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
  67                              unsigned int dataoff, unsigned int datalen,
  68                              enum sip_header_types type,
  69                              unsigned int *matchoff, unsigned int *matchlen);
  70
  71 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
  72                                  unsigned int dataoff, unsigned int datalen,
  73                                  enum sdp_header_types type,
  74                                  enum sdp_header_types term,
  75                                  unsigned int *matchoff, unsigned int *matchlen);
  76
  77 #endif /* __KERNEL__ */
  78 #endif /* __NF_CONNTRACK_SIP_H__ */