netdev - Re: [PATCH] ipv4/ipv6: check hop limit field on input

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Message-Id: <20090601.190430.80366622.davem@davemloft.net>
Date:	Mon, 01 Jun 2009 19:04:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nicolas.dichtel@....6wind.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4/ipv6: check hop limit field on input

From: Nicolas Dichtel <nicolas.dichtel@....6wind.com>
Date: Mon, 01 Jun 2009 17:13:43 +0200

> RFC indicates that a router must drop the packet if this field is 0.

It only must do this when executing the forwarding function.  It's an
egress check, not an ingress one.

I'm not applying this patch, it can even break some applications
out there that use a TTL of zero intentionally to keep traffic
only on a local subnet.
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