linux-kernel - Re: [PATCH net-2.6.25 1/8] Create ipv4_is_<type>(_

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Message-ID: <Pine.LNX.4.64.0712180001110.32270@fbirervta.pbzchgretzou.qr>
Date:	Tue, 18 Dec 2007 00:02:37 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	David Miller <davem@...emloft.net>
cc:	joe@...ches.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-2.6.25 1/8] Create ipv4_is_<type>(__be32 addr)
 functions


On Dec 17 2007 14:43, David Miller wrote:
>> On Dec 13 2007 15:38, Joe Perches wrote:
>> >+static inline bool ipv4_is_private_10(__be32 addr)
>> >+{
>> >+	return (addr & htonl(0xff000000)) == htonl(0x0a000000);
>> >+}
>> 
>> What are these functions needed for, even? There does not seem to be
>> any code (at least in davem's net-2.6.25:net/ipv4/, where I dared to grep)
>> that uses them.
>
>You really need to grep the whole tree, never ever decrease the scope
>of directories to search if you want to see if an interface is used.
>
Hah you got me there :)

>It's used by some ipv6 address translation code as well as some
>bits in SCTP:
>
>include/net/addrconf.h:	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
>net/sctp/protocol.c:	} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
>
>So lazy...

I just discovered git-grep...
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