#ifndef __NF_CONNTRACK_SIP_H__
#define __NF_CONNTRACK_SIP_H__
#ifdef __KERNEL__
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/types.h>
#define SIP_PORT 5060
#define SIP_TIMEOUT 3600
struct nf_ct_sip_master {
unsigned int register_cseq;
unsigned int invite_cseq;
__be16 forced_dport;
};
enum sip_expectation_classes {
SIP_EXPECT_SIGNALLING,
SIP_EXPECT_AUDIO,
SIP_EXPECT_VIDEO,
SIP_EXPECT_IMAGE,
__SIP_EXPECT_MAX
};
#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
struct sdp_media_type {
const char *name;
unsigned int len;
enum sip_expectation_classes class;
};
#define SDP_MEDIA_TYPE(__name, __class) \
{ \
.name = (__name), \
.len = sizeof(__name) - 1, \
.class = (__class), \
}
struct sip_handler {
const char *method;
unsigned int len;
int (*request)(struct sk_buff *skb, unsigned int protoff,
unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq);
int (*response)(struct sk_buff *skb, unsigned int protoff,
unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq, unsigned int code);
};
#define SIP_HANDLER(__method, __request, __response) \
{ \
.method = (__method), \
.len = sizeof(__method) - 1, \
.request = (__request), \
.response = (__response), \
}
struct sip_header {
const char *name;
const char *cname;
const char *search;
unsigned int len;
unsigned int clen;
unsigned int slen;
int (*match_len)(const struct nf_conn *ct,
const char *dptr, const char *limit,
int *shift);
};
#define __SIP_HDR(__name, __cname, __search, __match) \
{ \
.name = (__name), \
.len = sizeof(__name) - 1, \
.cname = (__cname), \
.clen = (__cname) ? sizeof(__cname) - 1 : 0, \
.search = (__search), \
.slen = (__search) ? sizeof(__search) - 1 : 0, \
.match_len = (__match), \
}
#define SIP_HDR(__name, __cname, __search, __match) \
__SIP_HDR(__name, __cname, __search, __match)
#define SDP_HDR(__name, __search, __match) \
__SIP_HDR(__name, NULL, __search, __match)
enum sip_header_types {
SIP_HDR_CSEQ,
SIP_HDR_FROM,
SIP_HDR_TO,
SIP_HDR_CONTACT,
SIP_HDR_VIA_UDP,
SIP_HDR_VIA_TCP,
SIP_HDR_EXPIRES,
SIP_HDR_CONTENT_LENGTH,
SIP_HDR_CALL_ID,
};
enum sdp_header_types {
SDP_HDR_UNSPEC,
SDP_HDR_VERSION,
SDP_HDR_OWNER,
SDP_HDR_CONNECTION,
SDP_HDR_MEDIA,
};
struct nf_nat_sip_hooks {
unsigned int (*msg)(struct sk_buff *skb,
unsigned int protoff,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen);
void (*seq_adjust)(struct sk_buff *skb,
unsigned int protoff, s16 off);
unsigned int (*expect)(struct sk_buff *skb,
unsigned int protoff,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *exp,
unsigned int matchoff,
unsigned int matchlen);
unsigned int (*sdp_addr)(struct sk_buff *skb,
unsigned int protoff,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
unsigned int sdpoff,
enum sdp_header_types type,
enum sdp_header_types term,
const union nf_inet_addr *addr);
unsigned int (*sdp_port)(struct sk_buff *skb,
unsigned int protoff,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
unsigned int matchoff,
unsigned int matchlen,
u_int16_t port);
unsigned int (*sdp_session)(struct sk_buff *skb,
unsigned int protoff,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
unsigned int sdpoff,
const union nf_inet_addr *addr);
unsigned int (*sdp_media)(struct sk_buff *skb,
unsigned int protoff,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *rtp_exp,
struct nf_conntrack_expect *rtcp_exp,
unsigned int mediaoff,
unsigned int medialen,
union nf_inet_addr *rtp_addr);
};
extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr,
unsigned int datalen, unsigned int *matchoff,
unsigned int *matchlen, union nf_inet_addr *addr,
__be16 *port);
int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
unsigned int dataoff, unsigned int datalen,
enum sip_header_types type, unsigned int *matchoff,
unsigned int *matchlen);
int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
unsigned int *dataoff, unsigned int datalen,
enum sip_header_types type, int *in_header,
unsigned int *matchoff, unsigned int *matchlen,
union nf_inet_addr *addr, __be16 *port);
int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
unsigned int dataoff, unsigned int datalen,
const char *name, unsigned int *matchoff,
unsigned int *matchlen, union nf_inet_addr *addr,
bool delim);
int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
unsigned int off, unsigned int datalen,
const char *name, unsigned int *matchoff,
unsigned int *matchen, unsigned int *val);
int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
unsigned int dataoff, unsigned int datalen,
enum sdp_header_types type,
enum sdp_header_types term,
unsigned int *matchoff, unsigned int *matchlen);
#endif
#endif