2015-07-29 13:52:06 +02:00
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/*
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* Copyright (c) 2014 Nicira, Inc.
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* Copyright (c) 2013 Cisco Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/openvswitch.h>
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#include <linux/module.h>
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#include <net/udp.h>
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#include <net/ip_tunnels.h>
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#include <net/rtnetlink.h>
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#include <net/vxlan.h>
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#include "datapath.h"
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#include "vport.h"
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#include "vport-netdev.h"
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static struct vport_ops ovs_vxlan_netdev_vport_ops;
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static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
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{
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struct vxlan_dev *vxlan = netdev_priv(vport->dev);
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__be16 dst_port = vxlan->cfg.dst_port;
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if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
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return -EMSGSIZE;
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if (vxlan->flags & VXLAN_F_GBP) {
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struct nlattr *exts;
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exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
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if (!exts)
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return -EMSGSIZE;
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if (vxlan->flags & VXLAN_F_GBP &&
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nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
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return -EMSGSIZE;
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nla_nest_end(skb, exts);
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}
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return 0;
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}
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static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
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[OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
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};
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static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
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struct vxlan_config *conf)
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{
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struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
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int err;
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if (nla_len(attr) < sizeof(struct nlattr))
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return -EINVAL;
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err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
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if (err < 0)
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return err;
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if (exts[OVS_VXLAN_EXT_GBP])
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conf->flags |= VXLAN_F_GBP;
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return 0;
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}
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static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
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{
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struct net *net = ovs_dp_get_net(parms->dp);
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struct nlattr *options = parms->options;
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struct net_device *dev;
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struct vport *vport;
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struct nlattr *a;
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int err;
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struct vxlan_config conf = {
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.no_share = true,
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2016-02-17 19:30:01 +01:00
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.flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
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vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices
Prior to 4.3, openvswitch tunnel vports (vxlan, gre and geneve) could
transmit vxlan packets of any size, constrained only by the ability to
send out the resulting packets. 4.3 introduced netdevs corresponding
to tunnel vports. These netdevs have an MTU, which limits the size of
a packet that can be successfully encapsulated. The default MTU
values are low (1500 or less), which is awkwardly small in the context
of physical networks supporting jumbo frames, and leads to a
conspicuous change in behaviour for userspace.
Instead, set the MTU on openvswitch-created netdevs to be the relevant
maximum (i.e. the maximum IP packet size minus any relevant overhead),
effectively restoring the behaviour prior to 4.3.
Signed-off-by: David Wragg <david@weave.works>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-02-10 01:05:58 +01:00
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/* Don't restrict the packets that can be sent by MTU */
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.mtu = IP_MAX_MTU,
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2015-07-29 13:52:06 +02:00
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};
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if (!options) {
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err = -EINVAL;
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goto error;
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}
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a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
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if (a && nla_len(a) == sizeof(u16)) {
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conf.dst_port = htons(nla_get_u16(a));
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} else {
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/* Require destination port from userspace. */
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err = -EINVAL;
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goto error;
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}
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vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
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if (IS_ERR(vport))
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return vport;
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a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
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if (a) {
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err = vxlan_configure_exts(vport, a, &conf);
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if (err) {
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ovs_vport_free(vport);
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goto error;
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}
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}
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rtnl_lock();
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dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
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if (IS_ERR(dev)) {
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rtnl_unlock();
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ovs_vport_free(vport);
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return ERR_CAST(dev);
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}
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dev_change_flags(dev, dev->flags | IFF_UP);
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rtnl_unlock();
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return vport;
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error:
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return ERR_PTR(err);
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}
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static struct vport *vxlan_create(const struct vport_parms *parms)
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{
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struct vport *vport;
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vport = vxlan_tnl_create(parms);
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if (IS_ERR(vport))
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return vport;
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return ovs_netdev_link(vport, parms->name);
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}
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static struct vport_ops ovs_vxlan_netdev_vport_ops = {
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.type = OVS_VPORT_TYPE_VXLAN,
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.create = vxlan_create,
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2015-08-08 08:51:33 +02:00
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.destroy = ovs_netdev_tunnel_destroy,
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2015-07-29 13:52:06 +02:00
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.get_options = vxlan_get_options,
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2015-10-21 08:00:10 +02:00
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.send = dev_queue_xmit,
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2015-07-29 13:52:06 +02:00
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};
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static int __init ovs_vxlan_tnl_init(void)
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{
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return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
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}
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static void __exit ovs_vxlan_tnl_exit(void)
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{
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ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
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}
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module_init(ovs_vxlan_tnl_init);
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module_exit(ovs_vxlan_tnl_exit);
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MODULE_DESCRIPTION("OVS: VXLAN switching port");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("vport-type-4");
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