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/usr/src/xtables-addons-2.6/extensions/xt_IPMARK.h is in xtables-addons-dkms 2.6-1.

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#ifndef _LINUX_NETFILTER_XT_IPMARK_H
#define _LINUX_NETFILTER_XT_IPMARK_H 1

enum {
	XT_IPMARK_SRC,
	XT_IPMARK_DST,
};

struct xt_ipmark_tginfo {
	__u32 andmask;
	__u32 ormask;
	__u8 selector;
	__u8 shift;
};

#endif /* _LINUX_NETFILTER_XT_IPMARK_H */