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

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Date:	Fri, 18 Jan 2008 11:13:19 +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.4.64.0801180242270.14025@...rervta.pbzchgretzou.qr> (at Fri, 18 Jan 2008 02:52:08 +0100 (CET)), Jan Engelhardt <jengelh@...putergmbh.de> says:

> 
> On Jan 18 2008 10:26, YOSHIFUJI Hideaki / 吉藤英明 wrote:
> >> -#define	IN_EXPERIMENTAL(a)	((((long int) (a)) & 0xf0000000) == 0xf0000000)
> >> -#define	IN_BADCLASS(a)		IN_EXPERIMENTAL((a))
> >
> >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,
> 
> Unalign? IPv6? "Limited" broadcast?

Sorry, ipv4_is_badclass().
Assuming IN_BADCLASS() is still there, we should not reuse the name
of "ipv6_is_badclass" because the their meanings are different.

> -static inline bool ipv4_is_badclass(__be32 addr)
> +static inline bool ipv4_is_broadcast(__be32 addr)
>  {

I'm just afraid that people might think ipv4_is_broadcast
is for testing subnet broadcast address.

255.255.255.255 is "limited broadcast address"
(vs subnet broadcast address, which can be forwarded by routers).

--yoshfuji
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