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/usr/src/xtables-addons-1.40/xt_DNETMAP.h is in xtables-addons-dkms 1.40-1.

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#ifndef _LINUX_NETFILTER_XT_DNETMAP_H
#define _LINUX_NETFILTER_XT_DNETMAP_H 1

enum {
	XT_DNETMAP_TTL = 1 << 0,
	XT_DNETMAP_REUSE = 1 << 1,
	XT_DNETMAP_PREFIX = 1 << 2,
};

struct xt_DNETMAP_tginfo {
	struct nf_nat_multi_range_compat prefix;
	__u8 flags;
	__s16 ttl;
};

#endif