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Open Source and information security mailing list archives
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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 > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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