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

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Date:	Fri, 18 Jan 2008 10:26:35 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	jengelh@...putergmbh.de
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ak@...e.de, vaf@...co.com,
	yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] IPv4: Enable use of 240/4 address space

In article <Pine.LNX.4.64.0801180023450.18447@...rervta.pbzchgretzou.qr> (at Fri, 18 Jan 2008 02:13:52 +0100 (CET)), Jan Engelhardt <jengelh@...putergmbh.de> says:

> 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)
>  

No, please keep these macros.

> @@ -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;
>  }
>  

To (un)align the IN_BADCLASS macro and ipv6_is_badclass() definition,
you should change the name anyway, e.g., ipv6_is_limited_broadcast()
or some something alike.

--yoshfuji
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