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_handler {
   9         const char      *method;
  10         unsigned int    len;
  11         int             (*request)(struct sk_buff *skb,
  12                                    const char **dptr, unsigned int *datalen,
  13                                    unsigned int cseq);
  14         int             (*response)(struct sk_buff *skb,
  15                                     const char **dptr, unsigned int *datalen,
  16                                     unsigned int cseq, unsigned int code);
  17 };
  18
  19 #define SIP_HANDLER(__method, __request, __response)                    \
  20 {                                                                       \
  21         .method         = (__method),                                   \
  22         .len            = sizeof(__method) - 1,                         \
  23         .request        = (__request),                                  \
  24         .response       = (__response),                                 \
  25 }
  26
  27 struct sip_header {
  28         const char      *name;
  29         const char      *cname;
  30         const char      *search;
  31         unsigned int    len;
  32         unsigned int    clen;
  33         unsigned int    slen;
  34         int             (*match_len)(const struct nf_conn *ct,
  35                                      const char *dptr, const char *limit,
  36                                      int *shift);
  37 };
  38
  39 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  40 {                                                                       \
  41         .name           = (__name),                                     \
  42         .len            = sizeof(__name) - 1,                           \
  43         .cname          = (__cname),                                    \
  44         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  45         .search         = (__search),                                   \
  46         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  47         .match_len      = (__match),                                    \
  48 }
  49
  50 #define SIP_HDR(__name, __cname, __search, __match) \
  51         __SIP_HDR(__name, __cname, __search, __match)
  52
  53 #define SDP_HDR(__name, __search, __match) \
  54         __SIP_HDR(__name, NULL, __search, __match)
  55
  56 enum sip_header_types {
  57         SIP_HDR_CSEQ,
  58         SIP_HDR_FROM,
  59         SIP_HDR_TO,
  60         SIP_HDR_CONTACT,
  61         SIP_HDR_VIA,
  62         SIP_HDR_CONTENT_LENGTH,
  63 };
  64
  65 enum sdp_header_types {
  66         SDP_HDR_UNSPEC,
  67         SDP_HDR_VERSION,
  68         SDP_HDR_OWNER_IP4,
  69         SDP_HDR_CONNECTION_IP4,
  70         SDP_HDR_OWNER_IP6,
  71         SDP_HDR_CONNECTION_IP6,
  72         SDP_HDR_MEDIA,
  73 };
  74
  75 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
  76                                        const char **dptr,
  77                                        unsigned int *datalen);
  78 extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
  79                                        const char **dptr,
  80                                        unsigned int *datalen,
  81                                        struct nf_conntrack_expect *exp);
  82
  83 extern int ct_sip_parse_request(const struct nf_conn *ct,
  84                                 const char *dptr, unsigned int datalen,
  85                                 unsigned int *matchoff, unsigned int *matchlen,
  86                                 union nf_inet_addr *addr, __be16 *port);
  87 extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
  88                              unsigned int dataoff, unsigned int datalen,
  89                              enum sip_header_types type,
  90                              unsigned int *matchoff, unsigned int *matchlen);
  91 extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
  92                                    unsigned int *dataoff, unsigned int datalen,
  93                                    enum sip_header_types type, int *in_header,
  94                                    unsigned int *matchoff, unsigned int *matchlen,
  95                                    union nf_inet_addr *addr, __be16 *port);
  96
  97 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
  98                                  unsigned int dataoff, unsigned int datalen,
  99                                  enum sdp_header_types type,
 100                                  enum sdp_header_types term,
 101                                  unsigned int *matchoff, unsigned int *matchlen);
 102
 103 #endif /* __KERNEL__ */
 104 #endif /* __NF_CONNTRACK_SIP_H__ */