Re: [PATCH] xenstore-paths: Allow subnet prefix in IP address

[Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>]

On 22/07/2026 10:49, Jürgen Groß wrote:
> On 22.07.26 09:14, Jan Beulich wrote:
>> On 08.06.2026 11:49, Tu Dinh wrote:
>>> In the guest-reported IP address in xenstore, it's useful to know which
>>> subnet it belongs to.
>>>
>>> Add a specification for the IPv6 host address/prefix format specified by
>>> RFC 4291.
>>>
>>> For the IPv4 address/prefix notation, as there seems to be no equivalent
>>> RFC specifying the host address/prefix format, specify it ourselves.
>>>
>>> Signed-off-by: Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>
>>
>> Btw, even if get_maintainer.pl doesn't say so, it would help to Cc the
>> maintainer of the component the doc for which is being modified.
> 
> Indeed.
> 
> I'm sharing Teddy's concerns. We just don't know who are potential 
> consumers
> of those Xenstore nodes. I know of at least three large SUSE customers 
> using
> Xen having written tooling accessing Xenstore.
> 
> What about adding another node for the prefix, like
> 
>    ~/attr/vif/$DEVID/ipv4/$INDEX/prefix = INTEGER
> 

Okay, I'll try adding that.

> 
> Juergen
> 
>>
>> Jan
>>
>>> --- a/docs/misc/xenstore-paths.pandoc
>>> +++ b/docs/misc/xenstore-paths.pandoc
>>> @@ -78,12 +78,12 @@ VALUES are strings and can take the following forms:
>>>   * MAC_ADDRESS -- 6 integers, in hexadecimal form, separated by ':',
>>>                    specifying an IEEE 802.3 ethernet MAC address.
>>> -* IPV4_ADDRESS -- 4 integers, in decimal form, separated by '.',
>>> -                  specifying an IP version 4 address as described
>>> -                  IETF RFC 791.
>>> -* IPV6_ADDRESS -- Up to 8 integers, in hexadecimal form, separated
>>> -                  by ':', specifying an IP version 6 address as
>>> -                  described in IETF RFC 4291.
>>> +* IPV4_ADDRESS -- An IP version 4 address as specified by IETF RFC 791,
>>> +                  optionally appended with a "/prefix" value 
>>> representing the
>>> +                  prefix length of the host address's subnet, with 
>>> "prefix"
>>> +                  being a decimal integer in the range of 0 to 32.
>>> +* IPV6_ADDRESS -- An IP version 6 address or abbreviated "address/ 
>>> prefix"
>>> +                  combination as specified by IETF RFC 4291 and RFC 
>>> 5952.
>>>   Additional TAGS may follow as a comma separated set of the following
>>>   tags enclosed in square brackets.
>>
> 



--
Ngoc Tu Dinh | Vates XCP-ng Developer

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