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diff --git a/src/ratelimiter.h b/src/ratelimiter.h
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+/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
+
+#ifndef RATELIMITER_H
+#define RATELIMITER_H
+
+#include <uapi/linux/netfilter/xt_hashlimit.h>
+struct wireguard_device;
+struct sk_buff;
+
+struct ratelimiter {
+ struct net *net;
+ struct xt_match *v4_match, *v6_match;
+ struct xt_hashlimit_mtinfo1 v4_info, v6_info;
+};
+
+int ratelimiter_init(struct ratelimiter *ratelimiter, struct wireguard_device *wg);
+void ratelimiter_uninit(struct ratelimiter *ratelimiter);
+bool ratelimiter_allow(struct ratelimiter *ratelimiter, struct sk_buff *skb);
+
+#endif