netdev - Re: [PATCH 2/3] sit: handle ICMPv4 for tunnels with no remote

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <4A2D4052.2010108@trash.net>
Date:	Mon, 08 Jun 2009 18:46:10 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	mail@...chahlusiak.de
CC:	David Miller <davem@...emloft.net>, contact@...chahlusiak.de,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] sit: handle ICMPv4 for tunnels with no remote

mail@...chahlusiak.de wrote:
> If iph.ttl == 0, it means that the ttl of the ipv4 package is inherited
> from the ipv6 package to be sent. In case the ipv4 ttl of the path
> expires, the ipv6 ttl would expire too. While the link does send a
> time_exceeded, I believe that the application should receive an ICMPv6
> time_exceeded as well, even if the package died right on the tunnel
> endpoint.

I have some patches that I wanted to post tommorrow, which will allow
to propagate errno values and queue congestion state of the underlying
device upwards from the hard_start_xmit() functions of virtual network
devices. With these patches, you can simply return -EHOSTUNREACH or
whatever is appropriate and it will be delivered to the application.

Would that help?

--
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