netdev - Re: linux kernel's IPV6_MULTICAST_HOPS default is 64; should be 1?

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

Message-ID: <4BDF8387.4000303@hp.com>
Date:	Mon, 03 May 2010 22:16:39 -0400
From:	Brian Haley <brian.haley@...com>
To:	enh <enh@...gle.com>
CC:	netdev@...r.kernel.org
Subject: Re: linux kernel's IPV6_MULTICAST_HOPS default is 64; should be 1?

enh wrote:
> RFC 3493 (http://tools.ietf.org/rfc/rfc3493.txt) says:
> 
>       IPV6_MULTICAST_HOPS
> 
>          Set the hop limit to use for outgoing multicast packets.  (Note
>          a separate option - IPV6_UNICAST_HOPS - is provided to set the
>          hop limit to use for outgoing unicast packets.)
> 
>          The interpretation of the argument is the same as for the
>          IPV6_UNICAST_HOPS option:
> 
>             x < -1:        return an error of EINVAL
>             x == -1:       use kernel default
>             0 <= x <= 255: use x
>             x >= 256:      return an error of EINVAL
> 
>             If IPV6_MULTICAST_HOPS is not set, the default is 1
>             (same as IPv4 today)
> 
>          Argument type: int
> 
> but if i create a socket and call getsockopt, i get 64, not 1. this
> happens both on Android (2.6.32) and on Ubuntu 8.04 (2.6.24).

<snip>

> is this a bug? is this the right place to report it? thanks!

It looks like a bug to me, feel free to send along a patch :)

-Brian

--
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