netdev - RE: [PATCH net v3] vti: fix spd lookup: match plaintext pkt, not ipsec pkt

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Date:	Mon, 18 Nov 2013 13:38:19 -0800
From:	Saurabh Mohan <saurabh.mohan@...cade.com>
To:	Christophe Gouault <christophe.gouault@...nd.com>,
	Steffen Klassert <steffen.klassert@...unet.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: RE: [PATCH net v3] vti: fix spd lookup: match plaintext pkt, not
 ipsec pkt



> -----Original Message-----
> From: Christophe Gouault [mailto:christophe.gouault@...nd.com]
> Sent: Thursday, November 07, 2013 4:56 AM
> To: Steffen Klassert
> Cc: David S. Miller; Herbert Xu; netdev@...r.kernel.org; Saurabh Mohan;
> Sergei Shtylyov; Eric Dumazet
> Subject: Re: [PATCH net v3] vti: fix spd lookup: match plaintext pkt, not ipsec
> pkt
> 
> Hello Steffen,
> 
> I am also interested in knowing Saurabh's intentions regarding the
> behavior of policies bound to vti interfaces.
>
The semantics is to match the policy "src 0.0.0.0/0 dst 0.0.0.0/0 proto any"
That is the only policy that VTI should use. The mark is needed to
distinguish and limit the policy to a specific vti tunnel interface only.
There is no other policy that may be applied to a vti interface.
The fact that traffic is going over the tunnel  interface implies that it
must be encrypted/decrypted. Applying the above policy is a way
to achieve that.
 
> However, please note that setting a policy with a wildcard selector
> works in both cases (before or after this patch), so a common test case
> can be defined.
> 
> Actually the *previous* patch on vti (7263a5187f9e vti: get rid of nf
> mark rule in prerouting) introduced significant changes, and implies
> behaviors dependant on the kernel version, but it seemed to meet
> Saurabh's agreement, as the following thread witnesses:
> 
> http://www.spinics.net/lists/netdev/msg253134.html
> 
Getting rid of the pre-routing mark, which had to be done outside of
the vti tunnel code was prone to misconfiguration.
Though it is unfortunate that it creates a kernel version dependency.
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