netdev - RE: ipip tunnel code (IPV4)

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Message-ID: <39C363776A4E8C4A94691D2BD9D1C9A1029EDD92@XCH-NW-7V2.nw.nos.boeing.com>
Date:	Thu, 10 Jan 2008 09:58:50 -0800
From:	"Templin, Fred L" <Fred.L.Templin@...ing.com>
To:	"Andy Johnson" <johnsonzjo@...il.com>, <netdev@...r.kernel.org>
Subject: RE: ipip tunnel code (IPV4)

Andy,

> -----Original Message-----
> From: Andy Johnson [mailto:johnsonzjo@...il.com] 
> Sent: Thursday, January 10, 2008 6:35 AM
> To: netdev@...r.kernel.org
> Subject: ipip tunnel code (IPV4)
> 
> Hello,
> 
> I am trying to learn the IPV4 ipip tunnel code  (net/ipv4/ipip.c)
> and I have two little questions about
> semantics of variables:
> 
> ipip_fb_tunnel_init - what does "fb" stand for ?
> 
> In tunnels_wc   : what does "wc" stand for ?

Similar names occur in net/ipv6/sit.c, which is the
IPv6-in-IPv4 analog of ipip.c. I am 90% certain that
"wc" stands for "wildcard" - it is used for selecting
the default tunnel interface when no other tunnel
interfaces match a specific (src, dst) pair.

In that light, I assume "fb" stands for something like
"fallback" although I am not certain. It would seem to
fit though, because the "fallback" tunnel interface is
the one that is selected by a "wildcard" match.

Would be interested if anyone could confirm or correct
my assumptions.

Thanks - Fred
fred.l.templin@...ing.com 

> Regards,
> Andy
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