Re: [Xen-devel] [PATCH 4/4] docs: Document xenstore paths for domain network address information

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 06/11/15 17:21, Paul Durrant wrote:
> It is useful to be able to see the network addresses in use by a domain
> for a particular vif in xenstore, for example so that ssh can be invoked
> by a toolstack to log into the guest domain.
>
> This patch documents paths to allow a domain to advertise MAC (unicast
> and multicast) and IP (versions 4 and 6) address information.
>
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
> Cc: Tim Deegan <tim@xxxxxxx>
> ---
>  docs/misc/xenstore-paths.markdown | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> diff --git a/docs/misc/xenstore-paths.markdown 
> b/docs/misc/xenstore-paths.markdown
> index 9e98d6f..68d3dbf 100644
> --- a/docs/misc/xenstore-paths.markdown
> +++ b/docs/misc/xenstore-paths.markdown
> @@ -39,6 +39,8 @@ before regexp expansion:
>  * $UUID -- a UUID in the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
>  * $NAME -- a string identifying an object within a domain. Typically
>    comprising only alphanumeric characters.
> +* $INDEX -- an integer used as part of a path when listing a set of
> +            values. Typically these integers are contiguous.
>  
>  VALUES are strings and can take the following forms:
>  
> @@ -56,6 +58,13 @@ VALUES are strings and can take the following forms:
>  * VERSION -- 2 or 3 integers, in decimal form separated by ".",
>               specifying major version, minor version, and then
>            (optionally) micro version.
> +* MAC_ADDRESS -- 6 integers, in hexadecimal form, separated by ':',
> +                 specifying an ethernet MAC address.
> +* IPV4_ADDRESS -- 4 integers, in decimal form, separated by '.',
> +                  specifying an IP version 4 address.
> +* IPV6_ADDRESS -- 8 integers, in hexadecimal form, separated by ':',
> +                  specifying an IP version 6 address. (There should
> +                  be strictly 8 integers i.e. '::' compression).

Given the "strictly", I presume you mean no "::" compression?

But why enforce that restriction? "::" compression is unambiguous and
typically makes the addresses rather more human readable.

~Andrew

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