From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steve Wise <swise@opengridcomputing.com>
Subject: Re: [PATCH 1/4 2.6.28] cxgb3 - manage a private ip address for iSCSI
Date: Fri, 22 Aug 2008 14:17:18 -0500
Message-ID: <48AF10BE.9050100@opengridcomputing.com>
References: <200808221838.m7MIcW6a004400@localhost.localdomain> <20080822120851.c45a90f2.akpm@linux-foundation.org>
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Cc: Karen Xie <kxie@chelsio.com>, netdev@vger.kernel.org,
	open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org,
	linux-kernel@vger.kernel.org, jgarzik@pobox.com,
	davem@davemloft.net, michaelc@cs.wisc.edu, rdreier@cisco.com,
	daisyc@us.ibm.com, wenxiong@us.ibm.com, bhua@us.ibm.com,
	divy@chelsio.com, dm@chelsio.com, leedom@chelsio.com
To: Andrew Morton <akpm@linux-foundation.org>
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Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

Andrew Morton wrote:
>> +	unsigned long octet;
>> +	const char *parse = buf;
>> +	char *endp;
>> +	int i;
>> +
>> +	for (i = 1; i <= 4; i++) {
>> +		octet = simple_strtoul(parse, &endp, 10);
>> +		if (endp == buf || octet > 255 ||
>> +		    (i < 4 && *endp != '.') ||
>> +		    (i == 4 && *endp != '\0' && *endp != '\n'))
>> +			return -EINVAL;
>> +		a = (a << 8) | octet;
>> +		parse = endp+1;
>> +	}
>> +	pi->iscsi_ipaddr = htonl(a);
>> +	return endp-buf;
>> +}
>>     
>
> This appears to be taking a dotted quad ipv4 address in ascii form,
> turning it into a u32 while performing checking?
>
> Surely we have a library function somewhere in networking which does
> this?  If not, I'd suggest writing one. 
>
>   

try in_aton() from include/linux/inet.h.