netdev - Re: [PATCH] iproute2: support xfrm upper protocol gre key

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Date:	Tue, 23 Nov 2010 10:54:18 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Timo Teräs <timo.teras@....fi>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] iproute2: support xfrm upper protocol gre key

On Tue, 23 Nov 2010 20:38:58 +0200
Timo Teräs <timo.teras@....fi> wrote:

> On 11/23/2010 08:13 PM, Stephen Hemminger wrote:
> > On Tue, 23 Nov 2010 18:44:44 +0200
> > Timo Teräs <timo.teras@....fi> wrote:
> >> On 11/23/2010 06:24 PM, Stephen Hemminger wrote:
> >>> The GRE key is not really an IPv4 address. Why should the utilities
> >>> use IPv4 address manipulation to format/scan it.  It makes more sense
> >>> to me to just use u32 an do the necessary ntohl.
> >>
> >> This is pretty much how iptunnel.c does it, so I copied the code. Would
> >> you prefer to format it as single u32 number? Or use something else for
> >> formatting it similar to IPv4?
> >>
> >> In either case, we should change iptunnel.c to match ipxfrm.c. It'll be
> >> easier if both parts handling the gre key treat it equivalently.
> >>
> >> I think Cisco does indeed treat it as u32 number in the configurations.
> >> So I'm okay updating this patch, and fixing iptunnel.c side too. We
> >> might still want to keep the parsing of ipv4 format to keep backwards
> >> compatibility.
> > 
> > My preference would be to take both dotted quad and a single
> > number.
> 
> And I assume that when dumping stuff, it should be output as single
> number. Or make that configurable with some switch?
> 
> I'll refresh my patch and fix iptunnel.c output tomorrow.

Just show it as a decimal number. That is what Cisco and Juniper do.

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