linux-kernel - [PATCH] IPv4: Enable use of 240/4 address space

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Date:	Fri, 18 Jan 2008 02:13:52 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	"David S. Miller" <davem@...emloft.net>
cc:	Network Development Mailing List <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>,
	YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org>,
	Vince Fuller <vaf@...co.com>
Subject: [PATCH] IPv4: Enable use of 240/4 address space


On Jan 7 2008 17:10, Vince Fuller wrote:
>
>This set of diffs modify the 2.6.20 kernel to enable use of the 240/4
>(aka "class-E") address space as consistent with the Internet Draft
>draft-fuller-240space-00.txt.
>

Below is a patch against davem/net-2.6.25. It might look very spartan, 
but that is actually all that is needed on a sane system. No class E 
macros or so needed.

Only the ipv4_is_badclass() might need renaming if you think it really 
needs a name change. Or maybe a comment. Comments please :)

===
ancestor 7651a1f7ebe567f9088283f6354a5634b5dccb8e
commit 44762168d7cbefc4f8753a79d99a761cbd9875d9
Author: Jan Engelhardt <jengelh@...putergmbh.de>
Date:   Fri Jan 18 02:10:44 2008 +0100

    IPv4: enable use of 240/4 address space
    
    This short patch modifies the IPv4 networking to enable use of the
    240.0.0.0/4 (aka "class-E") address space as propsed in the internet
    draft draft-fuller-240space-00.txt.
    
    Signed-off-by: Jan Engelhardt <jengelh@...putergmbh.de>

diff --git a/include/linux/in.h b/include/linux/in.h
index 27d8a5a..b01bf75 100644
--- a/include/linux/in.h
+++ b/include/linux/in.h
@@ -216,9 +216,6 @@ struct sockaddr_in {
 #define	IN_MULTICAST(a)		IN_CLASSD(a)
 #define IN_MULTICAST_NET	0xF0000000
 
-#define	IN_EXPERIMENTAL(a)	((((long int) (a)) & 0xf0000000) == 0xf0000000)
-#define	IN_BADCLASS(a)		IN_EXPERIMENTAL((a))
-
 /* Address to accept any incoming messages. */
 #define	INADDR_ANY		((unsigned long int) 0x00000000)
 
@@ -264,7 +261,7 @@ static inline bool ipv4_is_local_multicast(__be32 addr)
 
 static inline bool ipv4_is_badclass(__be32 addr)
 {
-	return (addr & htonl(0xf0000000)) == htonl(0xf0000000);
+	return addr == 0xFFFFFFFF;
 }
 
 static inline bool ipv4_is_zeronet(__be32 addr)
--
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