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