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From: Mark Gillott <mgillott@vyatta.att-mail.com>
To: nicolas.dichtel@6wind.com, netdev@vger.kernel.org
Cc: steffen.klassert@secunet.com, herbert@gondor.apana.org.au
Subject: Re: [PATCH ipsec] xfrm: check DST_NOPOLICY as well as DST_NOXFRM
Date: Thu, 05 Dec 2019 08:10:36 +0000	[thread overview]
Message-ID: <9a0813f2446b0423963d871795e34b3fe99e301d.camel@vyatta.att-mail.com> (raw)
In-Reply-To: <5a033c2e-dbf3-426a-007c-e7eec85fc3a6@6wind.com>

On Wed, 2019-12-04 at 17:57 +0100, Nicolas Dichtel wrote:
> Le 04/12/2019 à 16:17, Mark Gillott a écrit :
> > Before performing a policy bundle lookup, check the DST_NOPOLICY
> > option, as well as DST_NOXFRM. That is, skip further processing if
> > either of the disable_policy or disable_xfrm sysctl attributes are
> > set.
> 
> Can you elaborate why this change is needed?

We have a separate DPDK-based dataplane that is responsible for all
IPsec processing - policy handing/encryption/decryption. Consequently
we set the net.ipv[4|6].conf.<if>.disable_policy sysctl to 1 for all
"interesting" interfaces. That is we want the kernel to ignore any
IPsec policies.

Despite the above & depending on configuration, we found that
originating traffic was ending up deep inside XFRM where it would get
dropped because of a route lookup problem.

Does that help?

Mark



  reply	other threads:[~2019-12-05  8:11 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 15:17 [PATCH ipsec] xfrm: check DST_NOPOLICY as well as DST_NOXFRM Mark Gillott
2019-12-04 16:57 ` Nicolas Dichtel
2019-12-05  8:10   ` Mark Gillott [this message]
2019-12-05  8:52     ` Nicolas Dichtel
2019-12-05 10:05       ` Mark Gillott
2019-12-05 10:51         ` Nicolas Dichtel
2019-12-05 11:11           ` Mark Gillott

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