From: David Miller <davem@davemloft.net>
To: dada1@cosmosbay.com
Cc: nicolas.dichtel@dev.6wind.com, netdev@vger.kernel.org
Subject: Re: [PATCH] ipv4/ipv6: check hop limit field on input
Date: Mon, 01 Jun 2009 22:43:30 -0700 (PDT) [thread overview]
Message-ID: <20090601.224330.267938162.davem@davemloft.net> (raw)
In-Reply-To: <4A24B920.2010605@cosmosbay.com>
From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 02 Jun 2009 07:31:12 +0200
> David Miller a écrit :
>> From: Nicolas Dichtel <nicolas.dichtel@dev.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.
>
> I wonder if we then should allow setting ttl to zero. I had to patch
> my kernel to allow ping to do this...
>
> I'll check RFC when time permits.
Eric, notice how I mentioned in my other reply to this thread
"multicast" applications, which use mc_ttl which we allow to be set to
zero.
next prev parent reply other threads:[~2009-06-02 5:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-01 15:13 [PATCH] ipv4/ipv6: check hop limit field on input Nicolas Dichtel
2009-06-01 16:19 ` Florian Westphal
2009-06-01 16:49 ` Nicolas Dichtel
2009-06-01 17:13 ` Florian Westphal
2009-06-02 9:30 ` Nicolas Dichtel
2009-06-01 18:43 ` Eric Dumazet
2009-06-01 18:55 ` Brian Haley
2009-06-02 1:54 ` John Dykstra
2009-06-02 2:02 ` David Miller
2009-06-02 9:22 ` John Dykstra
2009-06-02 9:32 ` David Miller
2009-06-02 9:35 ` Nicolas Dichtel
2009-06-02 9:30 ` Nicolas Dichtel
2009-06-02 9:30 ` Nicolas Dichtel
2009-06-02 2:04 ` David Miller
2009-06-02 5:31 ` Eric Dumazet
2009-06-02 5:43 ` David Miller [this message]
2009-06-02 9:36 ` Nicolas Dichtel
2009-06-02 9:37 ` David Miller
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