netdev - Re: [PATCH net-next v2] net: Add fib rules at vrf device create

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Message-ID: <20151209130422.GB9900@pox.localdomain>
Date:	Wed, 9 Dec 2015 14:04:22 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	shm@...ulusnetworks.com
Subject: Re: [PATCH net-next v2] net: Add fib rules at vrf device create

On 12/08/15 at 08:08pm, David Ahern wrote:
> On 12/8/15 7:44 PM, David Miller wrote:
> >Unfortunately it's too late for this, you should have considered this
> >issue fully when VRF first went into an upstream release.
> >
> >If I add your change, the user experience is _worse_.
> >
> >Users on older kernels have to use the full sequence, then if they
> >upgrade their kernels to one with this patch then the 'ru add' et
> >al. commands will fail.
> >
> 
> Perhaps this is another fug (feature bug), they do not fail:
> 
> root@...ny-jessie2:~# ip ru ls
> 0:	from all lookup local
> 32760:	from all iif vrf-green lookup vrf-green
> 32761:	from all oif vrf-green lookup vrf-green
> 32762:	from all iif vrf-blue lookup vrf-blue
> 32763:	from all oif vrf-blue lookup vrf-blue
> 32764:	from all iif vrf-red lookup vrf-red
> 32765:	from all oif vrf-red lookup vrf-red
> 32766:	from all lookup main
> 32767:	from all lookup default
> 
> root@...ny-jessie2:~# ip ru add oif vrf-red lookup vrf-red

This is not a bug. FIB rules can include forward jumps so it's
perfectly valid to have the same rule in the entire chain
multiple times. Just like it is for iptables and multiple chains.
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