netdev - Re: [PATCH] net: reallocate new socket option number for IPV6

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Message-Id: <20140806.151715.2113268376810129182.davem@davemloft.net>
Date:	Wed, 06 Aug 2014 15:17:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	pablo@...filter.org, therbert@...gle.com,
	netfilter-devel@...r.kernel.org, davej@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net: reallocate new socket option number for
 IPV6_AUTOFLOWLABEL

From: Florian Westphal <fw@...len.de>
Date: Thu, 7 Aug 2014 00:13:13 +0200

> Pablo Neira Ayuso <pablo@...filter.org> wrote:
>> cb1ce2e ("ipv6: Implement automatic flow label generation on transmit")
>> accidentally uses socket option 64, which is already used by ip6tables:
>> 
>>  IP6T_SO_SET_REPLACE / IP6T_SO_GET_INFO               64
>>  IP6T_SO_SET_ADD_COUNTERS / IP6T_SO_GET_ENTRIES       65
>> 
>> There is comment include/uapi/linux/in6.h warning about that.
>> 
>> Cc: Tom Herbert <therbert@...gle.com>
>> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
...
>> @@ -250,6 +249,7 @@ struct in6_flowlabel_req {
>>   */
>>  #define IPV6_RECVTCLASS		66
>>  #define IPV6_TCLASS		67
>> +#define IPV6_AUTOFLOWLABEL	68
> 
> This clashes with IP6T_SO_GET_REVISION_MATCH 8-}

:-)  77 appears to be the next actually usable value.
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