#ifndef __NF_CONNTRACK_SIP_H__

#define __NF_CONNTRACK_SIP_H__

#ifdef __KERNEL__

#define SIP_PORT	5060

#define SIP_TIMEOUT	3600

struct nf_ct_sip_master {

	unsigned int	register_cseq;

	unsigned int	invite_cseq;

};

enum sip_expectation_classes {

	SIP_EXPECT_SIGNALLING,

	SIP_EXPECT_AUDIO,

	SIP_EXPECT_VIDEO,

	__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,

				   const char **dptr, unsigned int *datalen,

				   unsigned int cseq);

	int		(*response)(struct sk_buff *skb,

				    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,

	SIP_HDR_EXPIRES,

	SIP_HDR_CONTENT_LENGTH,

};

enum sdp_header_types {

	SDP_HDR_UNSPEC,

	SDP_HDR_VERSION,

	SDP_HDR_OWNER_IP4,

	SDP_HDR_CONNECTION_IP4,

	SDP_HDR_OWNER_IP6,

	SDP_HDR_CONNECTION_IP6,

	SDP_HDR_MEDIA,

};

extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,

				       const char **dptr,

				       unsigned int *datalen);

extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,

					      const char **dptr,

					      unsigned int *datalen,

					      struct nf_conntrack_expect *exp,

					      unsigned int matchoff,

					      unsigned int matchlen);

extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,

					    const char **dptr,

					    unsigned int dataoff,

					    unsigned int *datalen,

					    enum sdp_header_types type,

					    enum sdp_header_types term,

					    const union nf_inet_addr *addr);

extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,

					    const char **dptr,

					    unsigned int *datalen,

					    unsigned int matchoff,

					    unsigned int matchlen,

					    u_int16_t port);

extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,

					       const char **dptr,

					       unsigned int dataoff,

					       unsigned int *datalen,

					       const union nf_inet_addr *addr);

extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,

					     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 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);

extern 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);

extern 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);

extern 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);

extern 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);

extern 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 /* __KERNEL__ */

#endif /* __NF_CONNTRACK_SIP_H__ */