/usr/src/xtables-addons-3.0/extensions/xt_quota2.h is in xtables-addons-dkms 3.0-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #ifndef _XT_QUOTA_H
#define _XT_QUOTA_H
enum xt_quota_flags {
	XT_QUOTA_INVERT    = 1 << 0,
	XT_QUOTA_GROW      = 1 << 1,
	XT_QUOTA_PACKET    = 1 << 2,
	XT_QUOTA_NO_CHANGE = 1 << 3,
	XT_QUOTA_MASK      = 0x0F,
};
struct xt_quota_counter;
struct xt_quota_mtinfo2 {
	char name[15];
	u_int8_t flags;
	/* Comparison-invariant */
	aligned_u64 quota;
	/* Used internally by the kernel */
	struct xt_quota_counter *master __attribute__((aligned(8)));
};
#endif /* _XT_QUOTA_H */
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