On Mon, 2016-03-14 at 15:47 -0400, Sowmini Varadhan wrote: > > For LLC based protocols like lldp, stp etc., the ethernet header > is an 802.3 header with a h_proto that is not 0x800, 0x86dd, or > even 0x806. In this world, the skb_network_header() points at > the DSAP/SSAP/.. and is not likely to be NET_IP_ALIGNed in > ixgbe_atr(). > > With LLC, drivers are not likely to correctly find IPVERSION, > or "6", at hdr.ipv4->version, but will instead just needlessly > trigger an unaligned access. (IPv4/IPv6 over LLC is almost never > implemented). > > The unaligned access is thus avoidable: bail out quickly after > examining skb->protocol. The only Ethernet II protocols handled > are IPv4 and IPv6 > > Signed-off-by: Sowmini Varadhan <sowmini.varad...@oracle.com> > --- > v2: Alexander Duyck comments > v3: filter out all ethertypes except for Ethernet II and (IPv4 or > IPv6) > > drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 5 +++++ > 1 files changed, 5 insertions(+), 0 deletions(-)
This does not apply since Alex Duyck beat you to the fix. Here is the patch he submitted on 3/15 which corrects the issue. So I am dropping your patch from the queue. commit 04b8b51c34837765cf6250f69d419c439dc393bf Author: Alexander Duyck <adu...@mirantis.com> Date: Tue Mar 15 15:10:22 2016 -0700 ixgbe: Fix ATR so that it correctly handles IPv6 extension headers The ATR code was assuming that it would be able to use tcp_hdr for every TCP frame that came through. However this isn't the case as it is possible for a frame to arrive that is TCP but sent through something like a raw socket. As a result the driver was setting up bad filters in which tcp_hdr was really pointing to the network header so the data was all invalid. In order to correct this I have added a bit of parsing logic that will determine the TCP header location based off of the network header and either the offset in the case of the IPv4 header, or a walk through the IPv6 extension headers until it encounters the header that indicates IPPROTO_TCP. In addition I have added checks to verify that the lowest protocol provided is recognized as IPv4 or IPv6 to help mitigate raw sockets using ETH_P_ALL from having ATR applied to them. Signed-off-by: Alexander Duyck <adu...@mirantis.com>
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