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_VIDEO,
  16         __SIP_EXPECT_MAX
  17 };
  18 #define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  19
  20 struct sdp_media_type {
  21         const char                      *name;
  22         unsigned int                    len;
  23         enum sip_expectation_classes    class;
  24 };
  25
  26 #define SDP_MEDIA_TYPE(__name, __class)                                 \
  27 {                                                                       \
  28         .name   = (__name),                                             \
  29         .len    = sizeof(__name) - 1,                                   \
  30         .class  = (__class),                                            \
  31 }
  32
  33 struct sip_handler {
  34         const char      *method;
  35         unsigned int    len;
  36         int             (*request)(struct sk_buff *skb,
  37                                    const char **dptr, unsigned int *datalen,
  38                                    unsigned int cseq);
  39         int             (*response)(struct sk_buff *skb,
  40                                     const char **dptr, unsigned int *datalen,
  41                                     unsigned int cseq, unsigned int code);
  42 };
  43
  44 #define SIP_HANDLER(__method, __request, __response)                    \
  45 {                                                                       \
  46         .method         = (__method),                                   \
  47         .len            = sizeof(__method) - 1,                         \
  48         .request        = (__request),                                  \
  49         .response       = (__response),                                 \
  50 }
  51
  52 struct sip_header {
  53         const char      *name;
  54         const char      *cname;
  55         const char      *search;
  56         unsigned int    len;
  57         unsigned int    clen;
  58         unsigned int    slen;
  59         int             (*match_len)(const struct nf_conn *ct,
  60                                      const char *dptr, const char *limit,
  61                                      int *shift);
  62 };
  63
  64 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  65 {                                                                       \
  66         .name           = (__name),                                     \
  67         .len            = sizeof(__name) - 1,                           \
  68         .cname          = (__cname),                                    \
  69         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  70         .search         = (__search),                                   \
  71         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  72         .match_len      = (__match),                                    \
  73 }
  74
  75 #define SIP_HDR(__name, __cname, __search, __match) \
  76         __SIP_HDR(__name, __cname, __search, __match)
  77
  78 #define SDP_HDR(__name, __search, __match) \
  79         __SIP_HDR(__name, NULL, __search, __match)
  80
  81 enum sip_header_types {
  82         SIP_HDR_CSEQ,
  83         SIP_HDR_FROM,
  84         SIP_HDR_TO,
  85         SIP_HDR_CONTACT,
  86         SIP_HDR_VIA,
  87         SIP_HDR_EXPIRES,
  88         SIP_HDR_CONTENT_LENGTH,
  89 };
  90
  91 enum sdp_header_types {
  92         SDP_HDR_UNSPEC,
  93         SDP_HDR_VERSION,
  94         SDP_HDR_OWNER_IP4,
  95         SDP_HDR_CONNECTION_IP4,
  96         SDP_HDR_OWNER_IP6,
  97         SDP_HDR_CONNECTION_IP6,
  98         SDP_HDR_MEDIA,
  99 };
 100
 101 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
 102                                        const char **dptr,
 103                                        unsigned int *datalen);
 104 extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
 105                                               const char **dptr,
 106                                               unsigned int *datalen,
 107                                               struct nf_conntrack_expect *exp,
 108                                               unsigned int matchoff,
 109                                               unsigned int matchlen);
 110 extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
 111                                             const char **dptr,
 112                                             unsigned int dataoff,
 113                                             unsigned int *datalen,
 114                                             enum sdp_header_types type,
 115                                             enum sdp_header_types term,
 116                                             const union nf_inet_addr *addr);
 117 extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
 118                                             const char **dptr,
 119                                             unsigned int *datalen,
 120                                             unsigned int matchoff,
 121                                             unsigned int matchlen,
 122                                             u_int16_t port);
 123 extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
 124                                                const char **dptr,
 125                                                unsigned int dataoff,
 126                                                unsigned int *datalen,
 127                                                const union nf_inet_addr *addr);
 128 extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
 129                                              const char **dptr,
 130                                              unsigned int *datalen,
 131                                              struct nf_conntrack_expect *rtp_exp,
 132                                              struct nf_conntrack_expect *rtcp_exp,
 133                                              unsigned int mediaoff,
 134                                              unsigned int medialen,
 135                                              union nf_inet_addr *rtp_addr);
 136
 137 extern int ct_sip_parse_request(const struct nf_conn *ct,
 138                                 const char *dptr, unsigned int datalen,
 139                                 unsigned int *matchoff, unsigned int *matchlen,
 140                                 union nf_inet_addr *addr, __be16 *port);
 141 extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 142                              unsigned int dataoff, unsigned int datalen,
 143                              enum sip_header_types type,
 144                              unsigned int *matchoff, unsigned int *matchlen);
 145 extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 146                                    unsigned int *dataoff, unsigned int datalen,
 147                                    enum sip_header_types type, int *in_header,
 148                                    unsigned int *matchoff, unsigned int *matchlen,
 149                                    union nf_inet_addr *addr, __be16 *port);
 150 extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 151                                       unsigned int dataoff, unsigned int datalen,
 152                                       const char *name,
 153                                       unsigned int *matchoff, unsigned int *matchlen,
 154                                       union nf_inet_addr *addr);
 155 extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 156                                         unsigned int off, unsigned int datalen,
 157                                         const char *name,
 158                                         unsigned int *matchoff, unsigned int *matchen,
 159                                         unsigned int *val);
 160
 161 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 162                                  unsigned int dataoff, unsigned int datalen,
 163                                  enum sdp_header_types type,
 164                                  enum sdp_header_types term,
 165                                  unsigned int *matchoff, unsigned int *matchlen);
 166
 167 #endif /* __KERNEL__ */
 168 #endif /* __NF_CONNTRACK_SIP_H__ */