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         unsigned int    invite_cseq;
  11 };
  12
  13 enum sip_expectation_classes {
  14         SIP_EXPECT_SIGNALLING,
  15         SIP_EXPECT_AUDIO,
  16         SIP_EXPECT_VIDEO,
  17         SIP_EXPECT_IMAGE,
  18         __SIP_EXPECT_MAX
  19 };
  20 #define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  21
  22 struct sdp_media_type {
  23         const char                      *name;
  24         unsigned int                    len;
  25         enum sip_expectation_classes    class;
  26 };
  27
  28 #define SDP_MEDIA_TYPE(__name, __class)                                 \
  29 {                                                                       \
  30         .name   = (__name),                                             \
  31         .len    = sizeof(__name) - 1,                                   \
  32         .class  = (__class),                                            \
  33 }
  34
  35 struct sip_handler {
  36         const char      *method;
  37         unsigned int    len;
  38         int             (*request)(struct sk_buff *skb, unsigned int dataoff,
  39                                    const char **dptr, unsigned int *datalen,
  40                                    unsigned int cseq);
  41         int             (*response)(struct sk_buff *skb, unsigned int dataoff,
  42                                     const char **dptr, unsigned int *datalen,
  43                                     unsigned int cseq, unsigned int code);
  44 };
  45
  46 #define SIP_HANDLER(__method, __request, __response)                    \
  47 {                                                                       \
  48         .method         = (__method),                                   \
  49         .len            = sizeof(__method) - 1,                         \
  50         .request        = (__request),                                  \
  51         .response       = (__response),                                 \
  52 }
  53
  54 struct sip_header {
  55         const char      *name;
  56         const char      *cname;
  57         const char      *search;
  58         unsigned int    len;
  59         unsigned int    clen;
  60         unsigned int    slen;
  61         int             (*match_len)(const struct nf_conn *ct,
  62                                      const char *dptr, const char *limit,
  63                                      int *shift);
  64 };
  65
  66 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  67 {                                                                       \
  68         .name           = (__name),                                     \
  69         .len            = sizeof(__name) - 1,                           \
  70         .cname          = (__cname),                                    \
  71         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  72         .search         = (__search),                                   \
  73         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  74         .match_len      = (__match),                                    \
  75 }
  76
  77 #define SIP_HDR(__name, __cname, __search, __match) \
  78         __SIP_HDR(__name, __cname, __search, __match)
  79
  80 #define SDP_HDR(__name, __search, __match) \
  81         __SIP_HDR(__name, NULL, __search, __match)
  82
  83 enum sip_header_types {
  84         SIP_HDR_CSEQ,
  85         SIP_HDR_FROM,
  86         SIP_HDR_TO,
  87         SIP_HDR_CONTACT,
  88         SIP_HDR_VIA_UDP,
  89         SIP_HDR_VIA_TCP,
  90         SIP_HDR_EXPIRES,
  91         SIP_HDR_CONTENT_LENGTH,
  92         SIP_HDR_CALL_ID,
  93 };
  94
  95 enum sdp_header_types {
  96         SDP_HDR_UNSPEC,
  97         SDP_HDR_VERSION,
  98         SDP_HDR_OWNER_IP4,
  99         SDP_HDR_CONNECTION_IP4,
 100         SDP_HDR_OWNER_IP6,
 101         SDP_HDR_CONNECTION_IP6,
 102         SDP_HDR_MEDIA,
 103 };
 104
 105 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
 106                                        unsigned int dataoff,
 107                                        const char **dptr,
 108                                        unsigned int *datalen);
 109 extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, s16 off);
 110 extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
 111                                               unsigned int dataoff,
 112                                               const char **dptr,
 113                                               unsigned int *datalen,
 114                                               struct nf_conntrack_expect *exp,
 115                                               unsigned int matchoff,
 116                                               unsigned int matchlen);
 117 extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
 118                                             unsigned int dataoff,
 119                                             const char **dptr,
 120                                             unsigned int *datalen,
 121                                             unsigned int sdpoff,
 122                                             enum sdp_header_types type,
 123                                             enum sdp_header_types term,
 124                                             const union nf_inet_addr *addr);
 125 extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
 126                                             unsigned int dataoff,
 127                                             const char **dptr,
 128                                             unsigned int *datalen,
 129                                             unsigned int matchoff,
 130                                             unsigned int matchlen,
 131                                             u_int16_t port);
 132 extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
 133                                                unsigned int dataoff,
 134                                                const char **dptr,
 135                                                unsigned int *datalen,
 136                                                unsigned int sdpoff,
 137                                                const union nf_inet_addr *addr);
 138 extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
 139                                              unsigned int dataoff,
 140                                              const char **dptr,
 141                                              unsigned int *datalen,
 142                                              struct nf_conntrack_expect *rtp_exp,
 143                                              struct nf_conntrack_expect *rtcp_exp,
 144                                              unsigned int mediaoff,
 145                                              unsigned int medialen,
 146                                              union nf_inet_addr *rtp_addr);
 147
 148 extern int ct_sip_parse_request(const struct nf_conn *ct,
 149                                 const char *dptr, unsigned int datalen,
 150                                 unsigned int *matchoff, unsigned int *matchlen,
 151                                 union nf_inet_addr *addr, __be16 *port);
 152 extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 153                              unsigned int dataoff, unsigned int datalen,
 154                              enum sip_header_types type,
 155                              unsigned int *matchoff, unsigned int *matchlen);
 156 extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 157                                    unsigned int *dataoff, unsigned int datalen,
 158                                    enum sip_header_types type, int *in_header,
 159                                    unsigned int *matchoff, unsigned int *matchlen,
 160                                    union nf_inet_addr *addr, __be16 *port);
 161 extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 162                                       unsigned int dataoff, unsigned int datalen,
 163                                       const char *name,
 164                                       unsigned int *matchoff, unsigned int *matchlen,
 165                                       union nf_inet_addr *addr);
 166 extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 167                                         unsigned int off, unsigned int datalen,
 168                                         const char *name,
 169                                         unsigned int *matchoff, unsigned int *matchen,
 170                                         unsigned int *val);
 171
 172 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 173                                  unsigned int dataoff, unsigned int datalen,
 174                                  enum sdp_header_types type,
 175                                  enum sdp_header_types term,
 176                                  unsigned int *matchoff, unsigned int *matchlen);
 177
 178 #endif /* __KERNEL__ */
 179 #endif /* __NF_CONNTRACK_SIP_H__ */