From 18c8241a91bd9208879666f1a1a13f454e66d75b Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sun, 3 May 1998 16:43:39 +0000
Subject: BIRD library: The story continues.

Complete resource manages and IP address handling.
---
 lib/ipv4.h | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

(limited to 'lib/ipv4.h')

diff --git a/lib/ipv4.h b/lib/ipv4.h
index 4b8c44c..fa8a27b 100644
--- a/lib/ipv4.h
+++ b/lib/ipv4.h
@@ -11,6 +11,15 @@
 
 #include <netinet/in.h>
 
+#include "lib/bitops.h"
+
+#ifdef DEBUG
+
+/*
+ *	Use the structural representation when you want to make sure
+ *	nobody unauthorized attempts to handle ip_addr as number.
+ */
+
 typedef struct ipv4_addr {
   u32 addr;
 } ip_addr;
@@ -18,18 +27,37 @@ typedef struct ipv4_addr {
 #define _I(x) (x).addr
 #define _MI(x) ((struct ip_addr) { x })
 
+#else
+
+typedef u32 ip_addr;
+
+#define _I(x) (x)
+#define _MI(x) (x)
+
+#endif
+
 #define IPA_NONE (_MI(0))
 
 #define ipa_equal(x,y) (_I(x) == _I(y))
+#define ipa_nonzero(x) _I(x)
 #define ipa_and(x,y) _MI(_I(x) & _I(y))
 #define ipa_or(x,y) _MI(_I(x) | _I(y))
 #define ipa_not(x) _MI(~_I(x))
-#define ipa_mkmask(x) _MI(ipv4_mkmask(x))
-#define ipa_mklen(x) ipv4_mklen(_I(x))
+#define ipa_mkmask(x) _MI(u32_mkmask(x))
+#define ipa_mklen(x) u32_masklen(_I(x))
+#define ipa_hash(x) ipv4_hash(_I(x))
+#define ipa_hton(x) x = _MI(htonl(_I(x)))
+#define ipa_ntoh(x) x = _MI(ntohl(_I(x)))
+#define ipa_classify(x) ipv4_classify(_I(x))
 
 unsigned ipv4_mklen(u32);
 u32 ipv4_mkmask(unsigned);
+int ipv4_classify(u32);
 
-/* ??? htonl and ntohl ??? */
+/* FIXME: Is this hash function uniformly distributed over standard routing tables? */
+static inline unsigned ipv4_hash(u32 a)
+{
+  return a ^ (a >> 16) ^ (a >> 24);
+}
 
 #endif
-- 
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