From 6dfd8f67760b977ec7e345aece872c2a40a3be1e Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 2 Jan 2013 16:12:02 +0100
Subject: add uh_addr_rfc1918()

---
 utils.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'utils.c')

diff --git a/utils.c b/utils.c
index d2ad296..742e280 100644
--- a/utils.c
+++ b/utils.c
@@ -217,3 +217,18 @@ char *uh_split_header(char *str)
 
 	return val;
 }
+
+bool uh_addr_rfc1918(struct uh_addr *addr)
+{
+	uint32_t a;
+
+	if (addr->family != AF_INET)
+		return false;
+
+	a = htonl(addr->in.s_addr);
+	return ((a >= 0x0A000000) && (a <= 0x0AFFFFFF)) ||
+	       ((a >= 0xAC100000) && (a <= 0xAC1FFFFF)) ||
+	       ((a >= 0xC0A80000) && (a <= 0xC0A8FFFF));
+
+	return 0;
+}
-- 
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