Release 4.7 include/net/netfilter/nf_conntrack_synproxy.h

#ifndef _NF_CONNTRACK_SYNPROXY_H

#define _NF_CONNTRACK_SYNPROXY_H

#include <net/netns/generic.h>


struct nf_conn_synproxy {
	
u32	isn;
	
u32	its;
	
u32	tsoff;
};



static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
	return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY);
#else
	return NULL;
#endif
}

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static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
	return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC);
#else
	return NULL;
#endif
}

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struct synproxy_stats {
	
unsigned int			syn_received;
	
unsigned int			cookie_invalid;
	
unsigned int			cookie_valid;
	
unsigned int			cookie_retrans;
	
unsigned int			conn_reopened;
};


struct synproxy_net {
	
struct nf_conn			*tmpl;
	
struct synproxy_stats __percpu	*stats;
};

extern int synproxy_net_id;


static inline struct synproxy_net *synproxy_pernet(struct net *net)
{
	return net_generic(net, synproxy_net_id);
}

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struct synproxy_options {
	
u8				options;
	
u8				wscale;
	
u16				mss;
	
u32				tsval;
	
u32				tsecr;
};

struct tcphdr;
struct xt_synproxy_info;
bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
			    const struct tcphdr *th,
			    struct synproxy_options *opts);
unsigned int synproxy_options_size(const struct synproxy_options *opts);
void synproxy_build_options(struct tcphdr *th,
			    const struct synproxy_options *opts);

void synproxy_init_timestamp_cookie(const struct xt_synproxy_info *info,
				    struct synproxy_options *opts);
void synproxy_check_timestamp_cookie(struct synproxy_options *opts);

unsigned int synproxy_tstamp_adjust(struct sk_buff *skb, unsigned int protoff,
				    struct tcphdr *th, struct nf_conn *ct,
				    enum ip_conntrack_info ctinfo,
				    const struct nf_conn_synproxy *synproxy);

#endif /* _NF_CONNTRACK_SYNPROXY_H */
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Directory: include/net/netfilter

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