On Tue, Mar 26, 2019 at 8:16 PM <we...@ucloud.cn> wrote:
>
> From: wenxu <we...@ucloud.cn>
>
> There is currently no support for the multicast/broadcast aspects
> of VXLAN in ovs. In the datapath flow the tun_dst must specific.
> But in the IP_TUNNEL_INFO_BRIDGE mode the tun_dst can not be specific.
> And the packet can forward through the fdb table of vxlan devcice. In
> this mode the broadcast/multicast packet can be sent through the
> following ways in ovs.
>
> ovs-vsctl add-port br0 vxlan -- set in vxlan type=vxlan \
> options:key=1000 options:remote_ip=flow
> ovs-ofctl add-flow br0 in_port=LOCAL,dl_dst=ff:ff:ff:ff:ff:ff, \
> action=output:vxlan
>
> bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.1 \
> src_vni 1000 vni 1000 self
> bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.2 \
> src_vni 1000 vni 1000 self
>
> Signed-off-by: wenxu <we...@ucloud.cn>
> ---
> include/uapi/linux/openvswitch.h | 1 +
> net/openvswitch/flow_netlink.c | 36 ++++++++++++++++++++++++++++++++----
> 2 files changed, 33 insertions(+), 4 deletions(-)
>
> diff --git a/include/uapi/linux/openvswitch.h
> b/include/uapi/linux/openvswitch.h
> index dbe0cbe..b8913b9 100644
> --- a/include/uapi/linux/openvswitch.h
> +++ b/include/uapi/linux/openvswitch.h
> @@ -364,6 +364,7 @@ enum ovs_tunnel_key_attr {
> OVS_TUNNEL_KEY_ATTR_IPV6_DST, /* struct in6_addr dst IPv6
> address. */
> OVS_TUNNEL_KEY_ATTR_PAD,
> OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS, /* struct erspan_metadata */
> + OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE, /* No argument.
> IPV4_INFO_BRIDGE mode.*/
> __OVS_TUNNEL_KEY_ATTR_MAX
> };
>
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index 691da85..edd7b41 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
...
> @@ -912,6 +931,13 @@ static int __ip_tun_to_nlattr(struct sk_buff *skb,
> return -EMSGSIZE;
> }
>
> + if (tun_proto == AF_INET && !(output->tun_flags & ~TUNNEL_KEY) &&
> + !output->u.ipv4.src && !output->u.ipv4.dst &&
> + !output->tp_src && !output->tp_dst &&
> + !output->ttl && !output->tos &&
> + nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE))
> + return -EMSGSIZE;
> +
It would be easier to just check IP_TUNNEL_INFO_BRIDGE in tunnel-info.
we can also skip serializing other parameters except VNI in this case.
