1. 根目录:
2. include
3. linux
4. netfilter
5. xt_state.h

#ifndef _XT_STATE_H
#define _XT_STATE_H

#define XT_STATE_BIT(ctinfo) (1 << ((ctinfo)%IP_CT_IS_REPLY+1))
#define XT_STATE_INVALID (1 << 0)

#define XT_STATE_UNTRACKED (1 << (IP_CT_NUMBER + 1))

struct xt_state_info {
	unsigned int statemask;
};
#endif /*_XT_STATE_H*/