From: Jiri Benc <jbenc@redhat.com>
To: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net,
hannes@stressinduktion.org, aduyck@mirantis.com,
daniel@iogearbox.net, pabeni@redhat.com
Subject: Re: [PATCH net-next] net/vxlan: Avoid unaligned access in vxlan_build_skb()
Date: Tue, 20 Sep 2016 19:09:29 +0200 [thread overview]
Message-ID: <20160920190929.57ddaeb0@griffin> (raw)
In-Reply-To: <20160920184333.17444823@griffin>
On Tue, 20 Sep 2016 18:43:33 +0200, Jiri Benc wrote:
> On Tue, 20 Sep 2016 12:31:08 -0400, Sowmini Varadhan wrote:
> > The vxlan header is after the ethernet header (14 bytes),
> > IP header (20 bytes, assuming no options) and udp header (8 bytes).
>
> If the VXLAN header is not aligned to 4 bytes, then IP header is not
> aligned to 4 bytes, too, and you have greater problems than just VXLAN.
...which is indeed the case. Sorry, I guess I'm too much focused on
VXLAN-GPE nowadays and I missed that we're building this before the
inner Ethernet header.
But the point stands, we have much greater problems here than VXLAN.
And I don't think that wrapping all IP address accesses into
get/put_unaligned all around the stack is the solution.
Jiri
next prev parent reply other threads:[~2016-09-20 17:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 14:27 [PATCH net-next] net/vxlan: Avoid unaligned access in vxlan_build_skb() Sowmini Varadhan
2016-09-20 15:31 ` Tom Herbert
2016-09-20 15:49 ` Sowmini Varadhan
2016-09-20 16:11 ` Jiri Benc
2016-09-20 16:31 ` Sowmini Varadhan
2016-09-20 16:43 ` Jiri Benc
2016-09-20 17:07 ` Sowmini Varadhan
2016-09-20 17:15 ` Jiri Benc
2016-09-20 17:09 ` Jiri Benc [this message]
2016-09-20 17:19 ` Tom Herbert
2016-09-20 17:24 ` Sowmini Varadhan
2016-09-22 5:52 ` David Miller
2016-09-22 21:30 ` Sowmini Varadhan
2016-09-23 12:06 ` David Miller
2016-09-23 14:17 ` Alexander Duyck
2016-09-23 17:20 ` Sowmini Varadhan
2016-09-23 17:38 ` Alexander Duyck
2016-09-23 23:41 ` Sowmini Varadhan
2016-09-24 0:43 ` Alexander Duyck
2016-09-28 17:03 ` Sowmini Varadhan
2016-09-28 18:08 ` Alexander Duyck
2016-09-28 19:56 ` Sowmini Varadhan
2016-09-20 16:45 ` Hannes Frederic Sowa
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