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