On Wed, 10 Feb 2016 16:47:21 +0100, Paolo Abeni wrote:
> --- a/drivers/net/geneve.c
> +++ b/drivers/net/geneve.c
> @@ -1441,7 +1441,8 @@ struct net_device *geneve_dev_create_fb(struct net
> *net, const char *name,
> return dev;
>
> err = geneve_configure(net, dev, &geneve_remote_unspec,
> - 0, 0, 0, htons(dst_port), true, 0);
> + 0, 0, 0, htons(dst_port), true,
> + GENEVE_F_UDP_ZERO_CSUM6_RX);
> if (err) {
> free_netdev(dev);
> return ERR_PTR(err);
> diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
> index 1605691..d933cb8 100644
> --- a/net/openvswitch/vport-vxlan.c
> +++ b/net/openvswitch/vport-vxlan.c
> @@ -90,7 +90,7 @@ static struct vport *vxlan_tnl_create(const struct
> vport_parms *parms)
> int err;
> struct vxlan_config conf = {
> .no_share = true,
> - .flags = VXLAN_F_COLLECT_METADATA,
> + .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
I'm afraid this looks wrong, we should not default to zero UDP checksum
over IPv6. See RFC 2460, section 8.1:
o Unlike IPv4, when UDP packets are originated by an IPv6 node,
the UDP checksum is not optional. That is, whenever
originating a UDP packet, an IPv6 node must compute a UDP
checksum over the packet and the pseudo-header, and, if that
computation yields a result of zero, it must be changed to hex
FFFF for placement in the UDP header. IPv6 receivers must
discard UDP packets containing a zero checksum, and should log
the error.
One may argue that with tunneling, the situation is different but
that's the reason why we have the IPv6 checksum flag and why it has
opposite meaning to the IPv4 one. We shouldn't default to non-RFC
behavior by default.
What is the problem with the current code? Is the UDP checksum not
calculated correctly?
Jiri
--
Jiri Benc
