include/linux/netfilter/nf_conntrack_sip.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NF_CONNTRACK_SIP_H__
   3 #define __NF_CONNTRACK_SIP_H__
   4 #ifdef __KERNEL__
   5
   6 #include <net/netfilter/nf_conntrack_expect.h>
   7
   8 #include <linux/types.h>
   9
  10 #define SIP_PORT        5060
  11 #define SIP_TIMEOUT     3600
  12
  13 struct nf_ct_sip_master {
  14         unsigned int    register_cseq;
  15         unsigned int    invite_cseq;
  16         __be16          forced_dport;
  17 };
  18
  19 enum sip_expectation_classes {
  20         SIP_EXPECT_SIGNALLING,
  21         SIP_EXPECT_AUDIO,
  22         SIP_EXPECT_VIDEO,
  23         SIP_EXPECT_IMAGE,
  24         __SIP_EXPECT_MAX
  25 };
  26 #define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  27
  28 struct sdp_media_type {
  29         const char                      *name;
  30         unsigned int                    len;
  31         enum sip_expectation_classes    class;
  32 };
  33
  34 #define SDP_MEDIA_TYPE(__name, __class)                                 \
  35 {                                                                       \
  36         .name   = (__name),                                             \
  37         .len    = sizeof(__name) - 1,                                   \
  38         .class  = (__class),                                            \
  39 }
  40
  41 struct sip_handler {
  42         const char      *method;
  43         unsigned int    len;
  44         int             (*request)(struct sk_buff *skb, unsigned int protoff,
  45                                    unsigned int dataoff,
  46                                    const char **dptr, unsigned int *datalen,
  47                                    unsigned int cseq);
  48         int             (*response)(struct sk_buff *skb, unsigned int protoff,
  49                                     unsigned int dataoff,
  50                                     const char **dptr, unsigned int *datalen,
  51                                     unsigned int cseq, unsigned int code);
  52 };
  53
  54 #define SIP_HANDLER(__method, __request, __response)                    \
  55 {                                                                       \
  56         .method         = (__method),                                   \
  57         .len            = sizeof(__method) - 1,                         \
  58         .request        = (__request),                                  \
  59         .response       = (__response),                                 \
  60 }
  61
  62 struct sip_header {
  63         const char      *name;
  64         const char      *cname;
  65         const char      *search;
  66         unsigned int    len;
  67         unsigned int    clen;
  68         unsigned int    slen;
  69         int             (*match_len)(const struct nf_conn *ct,
  70                                      const char *dptr, const char *limit,
  71                                      int *shift);
  72 };
  73
  74 #define __SIP_HDR(__name, __cname, __search, __match)                   \
  75 {                                                                       \
  76         .name           = (__name),                                     \
  77         .len            = sizeof(__name) - 1,                           \
  78         .cname          = (__cname),                                    \
  79         .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  80         .search         = (__search),                                   \
  81         .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  82         .match_len      = (__match),                                    \
  83 }
  84
  85 #define SIP_HDR(__name, __cname, __search, __match) \
  86         __SIP_HDR(__name, __cname, __search, __match)
  87
  88 #define SDP_HDR(__name, __search, __match) \
  89         __SIP_HDR(__name, NULL, __search, __match)
  90
  91 enum sip_header_types {
  92         SIP_HDR_CSEQ,
  93         SIP_HDR_FROM,
  94         SIP_HDR_TO,
  95         SIP_HDR_CONTACT,
  96         SIP_HDR_VIA_UDP,
  97         SIP_HDR_VIA_TCP,
  98         SIP_HDR_EXPIRES,
  99         SIP_HDR_CONTENT_LENGTH,
 100         SIP_HDR_CALL_ID,
 101 };
 102
 103 enum sdp_header_types {
 104         SDP_HDR_UNSPEC,
 105         SDP_HDR_VERSION,
 106         SDP_HDR_OWNER,
 107         SDP_HDR_CONNECTION,
 108         SDP_HDR_MEDIA,
 109 };
 110
 111 struct nf_nat_sip_hooks {
 112         unsigned int (*msg)(struct sk_buff *skb,
 113                             unsigned int protoff,
 114                             unsigned int dataoff,
 115                             const char **dptr,
 116                             unsigned int *datalen);
 117
 118         void (*seq_adjust)(struct sk_buff *skb,
 119                            unsigned int protoff, s16 off);
 120
 121         unsigned int (*expect)(struct sk_buff *skb,
 122                                unsigned int protoff,
 123                                unsigned int dataoff,
 124                                const char **dptr,
 125                                unsigned int *datalen,
 126                                struct nf_conntrack_expect *exp,
 127                                unsigned int matchoff,
 128                                unsigned int matchlen);
 129
 130         unsigned int (*sdp_addr)(struct sk_buff *skb,
 131                                  unsigned int protoff,
 132                                  unsigned int dataoff,
 133                                  const char **dptr,
 134                                  unsigned int *datalen,
 135                                  unsigned int sdpoff,
 136                                  enum sdp_header_types type,
 137                                  enum sdp_header_types term,
 138                                  const union nf_inet_addr *addr);
 139
 140         unsigned int (*sdp_port)(struct sk_buff *skb,
 141                                  unsigned int protoff,
 142                                  unsigned int dataoff,
 143                                  const char **dptr,
 144                                  unsigned int *datalen,
 145                                  unsigned int matchoff,
 146                                  unsigned int matchlen,
 147                                  u_int16_t port);
 148
 149         unsigned int (*sdp_session)(struct sk_buff *skb,
 150                                     unsigned int protoff,
 151                                     unsigned int dataoff,
 152                                     const char **dptr,
 153                                     unsigned int *datalen,
 154                                     unsigned int sdpoff,
 155                                     const union nf_inet_addr *addr);
 156
 157         unsigned int (*sdp_media)(struct sk_buff *skb,
 158                                   unsigned int protoff,
 159                                   unsigned int dataoff,
 160                                   const char **dptr,
 161                                   unsigned int *datalen,
 162                                   struct nf_conntrack_expect *rtp_exp,
 163                                   struct nf_conntrack_expect *rtcp_exp,
 164                                   unsigned int mediaoff,
 165                                   unsigned int medialen,
 166                                   union nf_inet_addr *rtp_addr);
 167 };
 168 extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
 169
 170 int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr,
 171                          unsigned int datalen, unsigned int *matchoff,
 172                          unsigned int *matchlen, union nf_inet_addr *addr,
 173                          __be16 *port);
 174 int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 175                       unsigned int dataoff, unsigned int datalen,
 176                       enum sip_header_types type, unsigned int *matchoff,
 177                       unsigned int *matchlen);
 178 int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 179                             unsigned int *dataoff, unsigned int datalen,
 180                             enum sip_header_types type, int *in_header,
 181                             unsigned int *matchoff, unsigned int *matchlen,
 182                             union nf_inet_addr *addr, __be16 *port);
 183 int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 184                                unsigned int dataoff, unsigned int datalen,
 185                                const char *name, unsigned int *matchoff,
 186                                unsigned int *matchlen, union nf_inet_addr *addr,
 187                                bool delim);
 188 int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 189                                  unsigned int off, unsigned int datalen,
 190                                  const char *name, unsigned int *matchoff,
 191                                  unsigned int *matchen, unsigned int *val);
 192
 193 int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 194                           unsigned int dataoff, unsigned int datalen,
 195                           enum sdp_header_types type,
 196                           enum sdp_header_types term,
 197                           unsigned int *matchoff, unsigned int *matchlen);
 198
 199 #endif /* __KERNEL__ */
 200 #endif /* __NF_CONNTRACK_SIP_H__ */