netdev - Re: [PATCH net-next 6/8] iproute2: Add support for the RTA

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Date:	Tue, 07 Apr 2015 07:55:39 -0700
From:	roopa <roopa@...ulusnetworks.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <shemming@...cade.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Vivek Venkatraman <vivek@...ulusnetworks.com>,
	rshearma@...cade.com
Subject: Re: [PATCH net-next 6/8] iproute2: Add support for the RTA_VIA attribute

On 4/6/15, 4:27 PM, Andy Gospodarek wrote:
> On Mon, Apr 06, 2015 at 04:04:06PM -0700, roopa wrote:
>> On 3/15/15, 12:52 PM, Eric W. Biederman wrote:
>>> Add support for the RTA_VIA attribute that specifies an address family
>>> as well as an address for the next hop gateway.
>>>
>>> To make it easy to pass this reorder inet_prefix so that it's tail
>>> is a proper RTA_VIA attribute.
>>>
>>> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
>>> ---
>>>   include/linux/rtnetlink.h |  7 +++++
>>>   include/utils.h           |  7 +++--
>>>   ip/iproute.c              | 76 +++++++++++++++++++++++++++++++++++++++++------
>>>   man/man8/ip-route.8.in    | 18 +++++++----
>>>   4 files changed, 90 insertions(+), 18 deletions(-)
>>>
>>> diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
>>> index 3eb78105399b..03e4c8df8e60 100644
>>> --- a/include/linux/rtnetlink.h
>>> +++ b/include/linux/rtnetlink.h
>>> @@ -303,6 +303,7 @@ enum rtattr_type_t {
>>>   	RTA_TABLE,
>>>   	RTA_MARK,
>>>   	RTA_MFC_STATS,
>>> +	RTA_VIA,
>> eric, if its not too late, what do you think about renaming RTA_VIA
>> attribute to
>> RTA_NEWGATEWAY (similar to your new RTA_NEWDST attribute to specify a label
>> dst) ?. RTA_VIA is fine too.
>> This is indeed a new way to specify a gateway (and can/will be used by RFC
>> 5549 in the future).
>>
>> If there is interest in renaming it to RTA_NEWGATEWAY (or any other name,
>> cant think of anything better right now),
>> I will be happy to submit a follow-on patch.
> FWIW, I actually do not mind the name RTA_VIA.  I was planning to
> replace use of RTA_GATEWAY in iproute2 and just usa RTA_VIA for all
> nexthops regardless of the address family of the dest route or nexthop
> and would allow easy creation of the infrastructure needed to support
> RFC5549 -- obviously while keeping backwards compatibility in the
> kernel.
ok, good to know.
>
> This was what my orignal set did (not submitted to netdev, but discussed
> with others at netconf) and it was much cleaner code-wise (but not ideal
> as I overloaded the use of RTA_GATEWAY and that was not pleasing to me
> or others).
ok, yeah i remember you had RTA_GATEWAY6 or something like that.

just to clarify, i was not suggesting overloading.
eric introduced cleaner abstracted attributes for RTA_DST and RTA_GATEWAY.
One is called RTA_NEWDST and I was thinking if changing RTA_GATEWAY to 
RTA_NEWGATEWAY
would be less confusing (because, the rest of the structures (ipv4/ipv6) 
where you will put the
RTA_VIA information is still called gw).

No worries, RTA_VIA can stay if more people prefer that.

Thanks!.
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