linux-kernel - Re: [PATCH net] openvswitch: Fix mask generation for IPv6 labels.

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Date:	Wed, 19 Nov 2014 15:19:48 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	joestringer@...ira.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	pshelar@...ira.com, dev@...nvswitch.org
Subject: Re: [PATCH net] openvswitch: Fix mask generation for IPv6 labels.

From: Joe Stringer <joestringer@...ira.com>
Date: Tue, 18 Nov 2014 10:54:17 -0800

> When userspace doesn't provide a mask, OVS datapath generates a fully
> unwildcarded mask for the flow. This is done by taking a copy of the
> flow key, then iterating across its attributes, setting all values to
> 0xff. This works for most attributes, as the length of the netlink
> attribute typically matches the length of the value. However, IPv6
> labels only use the lower 20 bits of the field. This patch makes a
> special case to handle this.
> 
> This fixes the following error seen when installing IPv6 flows without a mask:
> 
> openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff, max=fffff)
> 
> Signed-off-by: Joe Stringer <joestringer@...ira.com>

Judging by the discussion ongoing about this patch, I am assuming there
will be a new version of this change forthcoming.

Thanks.
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