Release 4.7 include/linux/netfilter/nf_conntrack_sip.h

#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 /* __KERNEL__ */
#endif /* __NF_CONNTRACK_SIP_H__ */
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Directory: include/linux/netfilter

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