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/usr/src/xtables-addons-3.0/extensions/xt_lscan.h is in xtables-addons-dkms 3.0-0.1.

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#ifndef _LINUX_NETFILTER_XT_LSCAN_H
#define _LINUX_NETFILTER_XT_LSCAN_H 1

struct xt_lscan_mtinfo {
	uint8_t match_stealth, match_syn, match_cn, match_gr;
};

#endif /* _LINUX_NETFILTER_XT_LSCAN_H */