Add xt_quota2

Support for inversion, upcounting, and changing the quota/counter
through sysfs.

extensions/xt_quota2.h

@@ -0,0 +1,24 @@
+#ifndef _XT_QUOTA_H
+#define _XT_QUOTA_H
+
+enum xt_quota_flags {
+	XT_QUOTA_INVERT = 0x1,
+	XT_QUOTA_GROW   = 0x2,
+	XT_QUOTA_MASK   = 0x3,
+};
+
+struct quota_sysfs_entry;
+
+struct xt_quota_mtinfo2 {
+	char name[31];
+	u_int8_t flags;
+
+	/* Comparison-invariant section */
+	aligned_u64 quota;
+
+	/* Used internally by the kernel */
+	struct xt_quota_mtinfo2 *master __attribute__((aligned(8)));
+	void *procfs_entry __attribute__((aligned(8)));
+};
+
+#endif /* _XT_QUOTA_H */