netdev - [PATCH net resend] virtio_net: reject XDP programs using header adjustment

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Date:   Wed, 25 Jan 2017 14:56:36 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org, john.fastabend@...il.com,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        David Miller <davem@...emloft.net>,
        John Fastabend <john.r.fastabend@...el.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net resend] virtio_net: reject XDP programs using header adjustment

commit 17bedab27231 ("bpf: xdp: Allow head adjustment in XDP prog")
added a new XDP helper to prepend and remove data from a frame.
Make virtio_net reject programs making use of this helper until
proper support is added.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Acked-by: John Fastabend <john.r.fastabend@...el.com>
---
 drivers/net/virtio_net.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f9bf94887ff1..a2aac4fd8e42 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1710,6 +1710,11 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog)
 	u16 xdp_qp = 0, curr_qp;
 	int i, err;
 
+	if (prog && prog->xdp_adjust_head) {
+		netdev_warn(dev, "Does not support bpf_xdp_adjust_head()\n");
+		return -EOPNOTSUPP;
+	}
+
 	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
 	    virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
 	    virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
-- 
2.11.0