include/linux/netfilter/nf_conntrack_sip.h

   1 #ifndef __NF_CONNTRACK_SIP_H__
   2 #define __NF_CONNTRACK_SIP_H__
   3 #ifdef __KERNEL__
   4
   5 #include <net/netfilter/nf_conntrack_expect.h>
   6
   7 #define SIP_PORT        5060
   8 #define SIP_TIMEOUT     3600
   9
  10 struct nf_ct_sip_master {
  11         unsigned int    register_cseq;
  12         unsigned int    invite_cseq;
  13 };
  14
  15 enum sip_expectation_classes {
  16         SIP_EXPECT_SIGNALLING,
  17         SIP_EXPECT_AUDIO,
  18         SIP_EXPECT_VIDEO,
  19         SIP_EXPECT_IMAGE,
  20         __SIP_EXPECT_MAX
  21 };
  22 #define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  23
  24 struct sdp_media_type {
  25         const char                      *name;
  26         unsigned int                    len;
  27         enum sip_expectation_classes    class;
  28 };
  29
  30 #define SDP_MEDIA_TYPE(__name, __class)                                 \
  31 {                                                                       \
  32         .name   = (__name),                                             \
  33         .len    = sizeof(__name) - 1,                                   \
  34         .class  = (__class),                                            \
  35 }
  36
  37 struct sip_handler {
  38         const char      *method;
  39         unsigned int    len;
  40         int             (*request)(struct sk_buff *skb, unsigned int protoff,
  41                                    unsigned int dataoff,
  42                                    const char **dptr, unsigned int *datalen,
  43                                    unsigned int cseq);
  44         int             (*response)(struct sk_buff *skb, unsigned int protoff,
  45                                     unsigned int dataoff,
  46                                     const char **dptr, unsigned int *datalen,
  47                                     unsigned int cseq, unsigned int code);
  48 };
  49
  50 #define SIP_HANDLER(__method, __request, __response)                    \
  51 {                                                                       \
  52         .method         = (__method),                                   \
  53         .len            = sizeof(__method) - 1,                         \
  54         .request        = (__request),                                  \
  55         .response       = (__response),                                 \
  56 }
  57
  58 struct sip_header {
  59         const char      *name;
  60         const char      *cname;
  61         const char      *search;
  62         unsigned int    len;
  63         unsigned int    clen;
  64         unsigned int    slen;
  65         int             (*match_len)(const struct nf_conn *ct,
  66                                      const char *dptr, const char *limit,
  67                                      int *shift);
  68 };
  69
  70 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  71 {                                                                       \
  72         .name           = (__name),                                     \
  73         .len            = sizeof(__name) - 1,                           \
  74         .cname          = (__cname),                                    \
  75         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  76         .search         = (__search),                                   \
  77         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  78         .match_len      = (__match),                                    \
  79 }
  80
  81 #define SIP_HDR(__name, __cname, __search, __match) \
  82         __SIP_HDR(__name, __cname, __search, __match)
  83
  84 #define SDP_HDR(__name, __search, __match) \
  85         __SIP_HDR(__name, NULL, __search, __match)
  86
  87 enum sip_header_types {
  88         SIP_HDR_CSEQ,
  89         SIP_HDR_FROM,
  90         SIP_HDR_TO,
  91         SIP_HDR_CONTACT,
  92         SIP_HDR_VIA_UDP,
  93         SIP_HDR_VIA_TCP,
  94         SIP_HDR_EXPIRES,
  95         SIP_HDR_CONTENT_LENGTH,
  96         SIP_HDR_CALL_ID,
  97 };
  98
  99 enum sdp_header_types {
 100         SDP_HDR_UNSPEC,
 101         SDP_HDR_VERSION,
 102         SDP_HDR_OWNER,
 103         SDP_HDR_CONNECTION,
 104         SDP_HDR_MEDIA,
 105 };
 106
 107 extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
 108                                        unsigned int protoff,
 109                                        unsigned int dataoff,
 110                                        const char **dptr,
 111                                        unsigned int *datalen);
 112 extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb,
 113                                           unsigned int protoff, s16 off);
 114 extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
 115                                               unsigned int protoff,
 116                                               unsigned int dataoff,
 117                                               const char **dptr,
 118                                               unsigned int *datalen,
 119                                               struct nf_conntrack_expect *exp,
 120                                               unsigned int matchoff,
 121                                               unsigned int matchlen);
 122 extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
 123                                             unsigned int protoff,
 124                                             unsigned int dataoff,
 125                                             const char **dptr,
 126                                             unsigned int *datalen,
 127                                             unsigned int sdpoff,
 128                                             enum sdp_header_types type,
 129                                             enum sdp_header_types term,
 130                                             const union nf_inet_addr *addr);
 131 extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
 132                                             unsigned int protoff,
 133                                             unsigned int dataoff,
 134                                             const char **dptr,
 135                                             unsigned int *datalen,
 136                                             unsigned int matchoff,
 137                                             unsigned int matchlen,
 138                                             u_int16_t port);
 139 extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
 140                                                unsigned int protoff,
 141                                                unsigned int dataoff,
 142                                                const char **dptr,
 143                                                unsigned int *datalen,
 144                                                unsigned int sdpoff,
 145                                                const union nf_inet_addr *addr);
 146 extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
 147                                              unsigned int protoff,
 148                                              unsigned int dataoff,
 149                                              const char **dptr,
 150                                              unsigned int *datalen,
 151                                              struct nf_conntrack_expect *rtp_exp,
 152                                              struct nf_conntrack_expect *rtcp_exp,
 153                                              unsigned int mediaoff,
 154                                              unsigned int medialen,
 155                                              union nf_inet_addr *rtp_addr);
 156
 157 extern int ct_sip_parse_request(const struct nf_conn *ct,
 158                                 const char *dptr, unsigned int datalen,
 159                                 unsigned int *matchoff, unsigned int *matchlen,
 160                                 union nf_inet_addr *addr, __be16 *port);
 161 extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 162                              unsigned int dataoff, unsigned int datalen,
 163                              enum sip_header_types type,
 164                              unsigned int *matchoff, unsigned int *matchlen);
 165 extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 166                                    unsigned int *dataoff, unsigned int datalen,
 167                                    enum sip_header_types type, int *in_header,
 168                                    unsigned int *matchoff, unsigned int *matchlen,
 169                                    union nf_inet_addr *addr, __be16 *port);
 170 extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 171                                       unsigned int dataoff, unsigned int datalen,
 172                                       const char *name,
 173                                       unsigned int *matchoff, unsigned int *matchlen,
 174                                       union nf_inet_addr *addr, bool delim);
 175 extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 176                                         unsigned int off, unsigned int datalen,
 177                                         const char *name,
 178                                         unsigned int *matchoff, unsigned int *matchen,
 179                                         unsigned int *val);
 180
 181 extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 182                                  unsigned int dataoff, unsigned int datalen,
 183                                  enum sdp_header_types type,
 184                                  enum sdp_header_types term,
 185                                  unsigned int *matchoff, unsigned int *matchlen);
 186
 187 #endif /* __KERNEL__ */
 188 #endif /* __NF_CONNTRACK_SIP_H__ */