Re: [PATCH bluetooth-next 2/4] 6lowpan: add nhc module for GHC extension header detection

[Stefan Schmidt <stefan@osg.samsung.com>]

Hello.

On 19/09/15 00:14, Alexander Aring wrote:
> On Fri, Sep 18, 2015 at 11:44:15PM +0200, Alexander Aring wrote:
>> Hi,
>>
>> On Fri, Sep 18, 2015 at 01:52:46PM +0200, Stefan Schmidt wrote:
> ....
>
>> btw:
>>
>> Something is wrong at iana registration:
>>
>> https://www.iana.org/assignments/_6lowpan-parameters/_6lowpan-parameters.xhtml#lowpan_nhc
>>
>> For RFC6282 they did each entry for each extension header, for GHC not.
>>
>> Don't know why :-(
>>
>> Also iana says it's
>>
>> 10110EEN whereas RFC7400 says it's 1011EIDN
>>      ^
>>      |
>>      I don't know where this bit comes from.
>>
> it isn't wrong, GHC EID is defined for 0-3 only so the first bit is
> always zero. So 10110 E E N is right whereas:
>
> 1011000N -> Hop
> 1011001N -> Routing
> 1011010N -> Fragment
> 1011011N -> Destination
>
> Seems like Mobility and IPv6 is not defined for GHC.
>
> But I still don't know why iana put it for RFC6282 in a new entry on the
> list for each EID and for GHC they did only one entry for the mask without
> EID bits.

I guess we could ask them if we really want to know.

regards
Stefan Schmidt