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 nf_ct_sip_master {
   9         unsigned int    register_cseq;
  10 };
  11
  12 enum sip_expectation_classes {
  13         SIP_EXPECT_SIGNALLING,
  14         SIP_EXPECT_AUDIO,
  15         __SIP_EXPECT_MAX
  16 };
  17 #define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  18
  19 struct sip_handler {
  20         const char      *method;
  21         unsigned int    len;
  22         int             (*request)(struct sk_buff *skb,
  23                                    const char **dptr, unsigned int *datalen,
  24                                    unsigned int cseq);
  25         int             (*response)(struct sk_buff *skb,
  26                                     const char **dptr, unsigned int *datalen,
  27                                     unsigned int cseq, unsigned int code);
  28 };
  29
  30 #define SIP_HANDLER(__method, __request, __response)                    \
  31 {                                                                       \
  32         .method         = (__method),                                   \
  33         .len            = sizeof(__method) - 1,                         \
  34         .request        = (__request),                                  \
  35         .response       = (__response),                                 \
  36 }
  37
  38 struct sip_header {
  39         const char      *name;
  40         const char      *cname;
  41         const char      *search;
  42         unsigned int    len;
  43         unsigned int    clen;
  44         unsigned int    slen;
  45         int             (*match_len)(const struct nf_conn *ct,
  46                                      const char *dptr, const char *limit,
  47                                      int *shift);
  48 };
  49
  50 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  51 {                                                                       \
  52         .name           = (__name),                                     \
  53         .len            = sizeof(__name) - 1,                           \
  54         .cname          = (__cname),                                    \
  55         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  56         .search         = (__search),                                   \
  57         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  58         .match_len      = (__match),                                    \
  59 }
  60
  61 #define SIP_HDR(__name, __cname, __search, __match) \
  62         __SIP_HDR(__name, __cname, __search, __match)
  63
  64 #define SDP_HDR(__name, __search, __match) \
  65         __SIP_HDR(__name, NULL, __search, __match)
  66
  67 enum sip_header_types {
  68         SIP_HDR_CSEQ,
  69         SIP_HDR_FROM,
  70         SIP_HDR_TO,
  71         SIP_HDR_CONTACT,
  72         SIP_HDR_VIA,
  73         SIP_HDR_EXPIRES,
  74         SIP_HDR_CONTENT_LENGTH,
  75 };
  76
  77 enum sdp_header_types {
  78         SDP_HDR_UNSPEC,
  79         SDP_HDR_VERSION,
  80         SDP_HDR_OWNER_IP4,
  81         SDP_HDR_CONNECTION_IP4,
  82         SDP_HDR_OWNER_IP6,
  83         SDP_HDR_CONNECTION_IP6,
  84         SDP_HDR_MEDIA,
  85 };
  86
  87 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
  88                                        const char **dptr,
  89                                        unsigned int *datalen);
  90 extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
  91                                               const char **dptr,
  92                                               unsigned int *datalen,
  93                                               struct nf_conntrack_expect *exp,
  94                                               unsigned int matchoff,
  95                                               unsigned int matchlen);
  96 extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
  97                                        const char **dptr,
  98                                        unsigned int *datalen,
  99                                        struct nf_conntrack_expect *rtp_exp,
 100                                        struct nf_conntrack_expect *rtcp_exp);
 101
 102 extern int ct_sip_parse_request(const struct nf_conn *ct,
 103                                 const char *dptr, unsigned int datalen,
 104                                 unsigned int *matchoff, unsigned int *matchlen,
 105                                 union nf_inet_addr *addr, __be16 *port);
 106 extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 107                              unsigned int dataoff, unsigned int datalen,
 108                              enum sip_header_types type,
 109                              unsigned int *matchoff, unsigned int *matchlen);
 110 extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 111                                    unsigned int *dataoff, unsigned int datalen,
 112                                    enum sip_header_types type, int *in_header,
 113                                    unsigned int *matchoff, unsigned int *matchlen,
 114                                    union nf_inet_addr *addr, __be16 *port);
 115 extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 116                                       unsigned int dataoff, unsigned int datalen,
 117                                       const char *name,
 118                                       unsigned int *matchoff, unsigned int *matchlen,
 119                                       union nf_inet_addr *addr);
 120 extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 121                                         unsigned int off, unsigned int datalen,
 122                                         const char *name,
 123                                         unsigned int *matchoff, unsigned int *matchen,
 124                                         unsigned int *val);
 125
 126 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 127                                  unsigned int dataoff, unsigned int datalen,
 128                                  enum sdp_header_types type,
 129                                  enum sdp_header_types term,
 130                                  unsigned int *matchoff, unsigned int *matchlen);
 131
 132 #endif /* __KERNEL__ */
 133 #endif /* __NF_CONNTRACK_SIP_H__ */