netdev - Re: [PATCH v9 net-next 5/7] openvswitch: add layer 3 support to ovs_packet_cmd

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Date:	Wed, 18 May 2016 11:24:21 +0900
From:	Simon Horman <simon.horman@...ronome.com>
To:	Jiri Benc <jbenc@...hat.com>
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org,
	Lorand Jakab <lojakab@...co.com>
Subject: Re: [PATCH v9 net-next 5/7] openvswitch: add layer 3 support to
 ovs_packet_cmd_execute()

On Tue, May 17, 2016 at 04:51:08PM +0200, Jiri Benc wrote:
> On Wed,  4 May 2016 16:36:31 +0900, Simon Horman wrote:
> > +	/* Packets from user space for execution only have metadata key
> > +	 * attributes.  OVS_KEY_ATTR_PACKET_ETHERTYPE is then used to specify
> > +	 * the starting layer of the packet.  Packets with Ethernet headers
> > +	 * have this attribute set to 0
> > +	 */
> > +	if (*attrs & (1ULL << OVS_KEY_ATTR_PACKET_ETHERTYPE)) {
> > +		__be16 eth_type;
> > +
> > +		if (is_mask) {
> > +			/* Always exact match packet EtherType */
> > +			eth_type = htons(0xffff);
> > +		} else {
> > +			eth_type = nla_get_be16(a[OVS_KEY_ATTR_PACKET_ETHERTYPE]);
> > +			is_layer3 = ((eth_type == htons(ETH_P_IP)) ||
> > +				     (eth_type == htons(ETH_P_IPV6)));
> 
> Unknown types need to be rejected, not treated as layer2, otherwise we
> may run into problems later (with combination of this kernel + newer
> user space) when we add more types, such as ETH_P_NSH.

I believe this is fixed by the following patch.

Possibly it makes sense to squash that patch into and earlier patches.