kernel/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 #include <linux/types.h>
   8
   9 #define SIP_PORT        5060
  10 #define SIP_TIMEOUT     3600
  11
  12 struct nf_ct_sip_master {
  13         unsigned int    register_cseq;
  14         unsigned int    invite_cseq;
  15         __be16          forced_dport;
  16 };
  17
  18 enum sip_expectation_classes {
  19         SIP_EXPECT_SIGNALLING,
  20         SIP_EXPECT_AUDIO,
  21         SIP_EXPECT_VIDEO,
  22         SIP_EXPECT_IMAGE,
  23         __SIP_EXPECT_MAX
  24 };
  25 #define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  26
  27 struct sdp_media_type {
  28         const char                      *name;
  29         unsigned int                    len;
  30         enum sip_expectation_classes    class;
  31 };
  32
  33 #define SDP_MEDIA_TYPE(__name, __class)                                 \
  34 {                                                                       \
  35         .name   = (__name),                                             \
  36         .len    = sizeof(__name) - 1,                                   \
  37         .class  = (__class),                                            \
  38 }
  39
  40 struct sip_handler {
  41         const char      *method;
  42         unsigned int    len;
  43         int             (*request)(struct sk_buff *skb, unsigned int protoff,
  44                                    unsigned int dataoff,
  45                                    const char **dptr, unsigned int *datalen,
  46                                    unsigned int cseq);
  47         int             (*response)(struct sk_buff *skb, unsigned int protoff,
  48                                     unsigned int dataoff,
  49                                     const char **dptr, unsigned int *datalen,
  50                                     unsigned int cseq, unsigned int code);
  51 };
  52
  53 #define SIP_HANDLER(__method, __request, __response)                    \
  54 {                                                                       \
  55         .method         = (__method),                                   \
  56         .len            = sizeof(__method) - 1,                         \
  57         .request        = (__request),                                  \
  58         .response       = (__response),                                 \
  59 }
  60
  61 struct sip_header {
  62         const char      *name;
  63         const char      *cname;
  64         const char      *search;
  65         unsigned int    len;
  66         unsigned int    clen;
  67         unsigned int    slen;
  68         int             (*match_len)(const struct nf_conn *ct,
  69                                      const char *dptr, const char *limit,
  70                                      int *shift);
  71 };
  72
  73 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  74 {                                                                       \
  75         .name           = (__name),                                     \
  76         .len            = sizeof(__name) - 1,                           \
  77         .cname          = (__cname),                                    \
  78         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  79         .search         = (__search),                                   \
  80         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  81         .match_len      = (__match),                                    \
  82 }
  83
  84 #define SIP_HDR(__name, __cname, __search, __match) \
  85         __SIP_HDR(__name, __cname, __search, __match)
  86
  87 #define SDP_HDR(__name, __search, __match) \
  88         __SIP_HDR(__name, NULL, __search, __match)
  89
  90 enum sip_header_types {
  91         SIP_HDR_CSEQ,
  92         SIP_HDR_FROM,
  93         SIP_HDR_TO,
  94         SIP_HDR_CONTACT,
  95         SIP_HDR_VIA_UDP,
  96         SIP_HDR_VIA_TCP,
  97         SIP_HDR_EXPIRES,
  98         SIP_HDR_CONTENT_LENGTH,
  99         SIP_HDR_CALL_ID,
 100 };
 101
 102 enum sdp_header_types {
 103         SDP_HDR_UNSPEC,
 104         SDP_HDR_VERSION,
 105         SDP_HDR_OWNER,
 106         SDP_HDR_CONNECTION,
 107         SDP_HDR_MEDIA,
 108 };
 109
 110 struct nf_nat_sip_hooks {
 111         unsigned int (*msg)(struct sk_buff *skb,
 112                             unsigned int protoff,
 113                             unsigned int dataoff,
 114                             const char **dptr,
 115                             unsigned int *datalen);
 116
 117         void (*seq_adjust)(struct sk_buff *skb,
 118                            unsigned int protoff, s16 off);
 119
 120         unsigned int (*expect)(struct sk_buff *skb,
 121                                unsigned int protoff,
 122                                unsigned int dataoff,
 123                                const char **dptr,
 124                                unsigned int *datalen,
 125                                struct nf_conntrack_expect *exp,
 126                                unsigned int matchoff,
 127                                unsigned int matchlen);
 128
 129         unsigned int (*sdp_addr)(struct sk_buff *skb,
 130                                  unsigned int protoff,
 131                                  unsigned int dataoff,
 132                                  const char **dptr,
 133                                  unsigned int *datalen,
 134                                  unsigned int sdpoff,
 135                                  enum sdp_header_types type,
 136                                  enum sdp_header_types term,
 137                                  const union nf_inet_addr *addr);
 138
 139         unsigned int (*sdp_port)(struct sk_buff *skb,
 140                                  unsigned int protoff,
 141                                  unsigned int dataoff,
 142                                  const char **dptr,
 143                                  unsigned int *datalen,
 144                                  unsigned int matchoff,
 145                                  unsigned int matchlen,
 146                                  u_int16_t port);
 147
 148         unsigned int (*sdp_session)(struct sk_buff *skb,
 149                                     unsigned int protoff,
 150                                     unsigned int dataoff,
 151                                     const char **dptr,
 152                                     unsigned int *datalen,
 153                                     unsigned int sdpoff,
 154                                     const union nf_inet_addr *addr);
 155
 156         unsigned int (*sdp_media)(struct sk_buff *skb,
 157                                   unsigned int protoff,
 158                                   unsigned int dataoff,
 159                                   const char **dptr,
 160                                   unsigned int *datalen,
 161                                   struct nf_conntrack_expect *rtp_exp,
 162                                   struct nf_conntrack_expect *rtcp_exp,
 163                                   unsigned int mediaoff,
 164                                   unsigned int medialen,
 165                                   union nf_inet_addr *rtp_addr);
 166 };
 167 extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
 168
 169 int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr,
 170                          unsigned int datalen, unsigned int *matchoff,
 171                          unsigned int *matchlen, union nf_inet_addr *addr,
 172                          __be16 *port);
 173 int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 174                       unsigned int dataoff, unsigned int datalen,
 175                       enum sip_header_types type, unsigned int *matchoff,
 176                       unsigned int *matchlen);
 177 int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 178                             unsigned int *dataoff, unsigned int datalen,
 179                             enum sip_header_types type, int *in_header,
 180                             unsigned int *matchoff, unsigned int *matchlen,
 181                             union nf_inet_addr *addr, __be16 *port);
 182 int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 183                                unsigned int dataoff, unsigned int datalen,
 184                                const char *name, unsigned int *matchoff,
 185                                unsigned int *matchlen, union nf_inet_addr *addr,
 186                                bool delim);
 187 int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 188                                  unsigned int off, unsigned int datalen,
 189                                  const char *name, unsigned int *matchoff,
 190                                  unsigned int *matchen, unsigned int *val);
 191
 192 int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 193                           unsigned int dataoff, unsigned int datalen,
 194                           enum sdp_header_types type,
 195                           enum sdp_header_types term,
 196                           unsigned int *matchoff, unsigned int *matchlen);
 197
 198 #endif /* __KERNEL__ */
 199 #endif /* __NF_CONNTRACK_SIP_H__ */