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 8struct nf_ct_sip_master { 9 unsigned int register_cseq; 10 unsigned int invite_cseq; 11}; 12 13enum sip_expectation_classes { 14 SIP_EXPECT_SIGNALLING, 15 SIP_EXPECT_AUDIO, 16 SIP_EXPECT_VIDEO, 17 SIP_EXPECT_IMAGE, 18 __SIP_EXPECT_MAX 19}; 20#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1) 21 22struct sdp_media_type { 23 const char *name; 24 unsigned int len; 25 enum sip_expectation_classes class; 26}; 27 28#define SDP_MEDIA_TYPE(__name, __class) \ 29{ \ 30 .name = (__name), \ 31 .len = sizeof(__name) - 1, \ 32 .class = (__class), \ 33} 34 35struct sip_handler { 36 const char *method; 37 unsigned int len; 38 int (*request)(struct sk_buff *skb, unsigned int dataoff, 39 const char **dptr, unsigned int *datalen, 40 unsigned int cseq); 41 int (*response)(struct sk_buff *skb, unsigned int dataoff, 42 const char **dptr, unsigned int *datalen, 43 unsigned int cseq, unsigned int code); 44}; 45 46#define SIP_HANDLER(__method, __request, __response) \ 47{ \ 48 .method = (__method), \ 49 .len = sizeof(__method) - 1, \ 50 .request = (__request), \ 51 .response = (__response), \ 52} 53 54struct sip_header { 55 const char *name; 56 const char *cname; 57 const char *search; 58 unsigned int len; 59 unsigned int clen; 60 unsigned int slen; 61 int (*match_len)(const struct nf_conn *ct, 62 const char *dptr, const char *limit, 63 int *shift); 64}; 65 66#define __SIP_HDR(__name, __cname, __search, __match) \ 67{ \ 68 .name = (__name), \ 69 .len = sizeof(__name) - 1, \ 70 .cname = (__cname), \ 71 .clen = (__cname) ? sizeof(__cname) - 1 : 0, \ 72 .search = (__search), \ 73 .slen = (__search) ? sizeof(__search) - 1 : 0, \ 74 .match_len = (__match), \ 75} 76 77#define SIP_HDR(__name, __cname, __search, __match) \ 78 __SIP_HDR(__name, __cname, __search, __match) 79 80#define SDP_HDR(__name, __search, __match) \ 81 __SIP_HDR(__name, NULL, __search, __match) 82 83enum sip_header_types { 84 SIP_HDR_CSEQ, 85 SIP_HDR_FROM, 86 SIP_HDR_TO, 87 SIP_HDR_CONTACT, 88 SIP_HDR_VIA_UDP, 89 SIP_HDR_VIA_TCP, 90 SIP_HDR_EXPIRES, 91 SIP_HDR_CONTENT_LENGTH, 92}; 93 94enum sdp_header_types { 95 SDP_HDR_UNSPEC, 96 SDP_HDR_VERSION, 97 SDP_HDR_OWNER_IP4, 98 SDP_HDR_CONNECTION_IP4, 99 SDP_HDR_OWNER_IP6, 100 SDP_HDR_CONNECTION_IP6, 101 SDP_HDR_MEDIA, 102}; 103 104extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb, 105 unsigned int dataoff, 106 const char **dptr, 107 unsigned int *datalen); 108extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, s16 off); 109extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb, 110 unsigned int dataoff, 111 const char **dptr, 112 unsigned int *datalen, 113 struct nf_conntrack_expect *exp, 114 unsigned int matchoff, 115 unsigned int matchlen); 116extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb, 117 unsigned int dataoff, 118 const char **dptr, 119 unsigned int *datalen, 120 unsigned int sdpoff, 121 enum sdp_header_types type, 122 enum sdp_header_types term, 123 const union nf_inet_addr *addr); 124extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb, 125 unsigned int dataoff, 126 const char **dptr, 127 unsigned int *datalen, 128 unsigned int matchoff, 129 unsigned int matchlen, 130 u_int16_t port); 131extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb, 132 unsigned int dataoff, 133 const char **dptr, 134 unsigned int *datalen, 135 unsigned int sdpoff, 136 const union nf_inet_addr *addr); 137extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb, 138 unsigned int dataoff, 139 const char **dptr, 140 unsigned int *datalen, 141 struct nf_conntrack_expect *rtp_exp, 142 struct nf_conntrack_expect *rtcp_exp, 143 unsigned int mediaoff, 144 unsigned int medialen, 145 union nf_inet_addr *rtp_addr); 146 147extern int ct_sip_parse_request(const struct nf_conn *ct, 148 const char *dptr, unsigned int datalen, 149 unsigned int *matchoff, unsigned int *matchlen, 150 union nf_inet_addr *addr, __be16 *port); 151extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr, 152 unsigned int dataoff, unsigned int datalen, 153 enum sip_header_types type, 154 unsigned int *matchoff, unsigned int *matchlen); 155extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr, 156 unsigned int *dataoff, unsigned int datalen, 157 enum sip_header_types type, int *in_header, 158 unsigned int *matchoff, unsigned int *matchlen, 159 union nf_inet_addr *addr, __be16 *port); 160extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr, 161 unsigned int dataoff, unsigned int datalen, 162 const char *name, 163 unsigned int *matchoff, unsigned int *matchlen, 164 union nf_inet_addr *addr); 165extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr, 166 unsigned int off, unsigned int datalen, 167 const char *name, 168 unsigned int *matchoff, unsigned int *matchen, 169 unsigned int *val); 170 171extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr, 172 unsigned int dataoff, unsigned int datalen, 173 enum sdp_header_types type, 174 enum sdp_header_types term, 175 unsigned int *matchoff, unsigned int *matchlen); 176 177#endif /* __KERNEL__ */ 178#endif /* __NF_CONNTRACK_SIP_H__ */ 179