text: /*
   * Copyright (c) 2015 Nicira, Inc.
   * Copyright (c) 2013 Cisco Systems, Inc.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   * 02110-1301, USA
   */
  
  #include <linux/kernel.h>
  #include <linux/skbuff.h>
  #include <linux/openvswitch.h>
  #include <linux/module.h>
  #include <net/udp.h>
  #include <net/ip_tunnels.h>
  #include <net/rtnetlink.h>
  #include <net/vxlan.h>
  
  #include "datapath.h"
  #include "vport.h"
  #include "vport-netdev.h"
  
  static struct vport_ops ovs_vxlan_netdev_vport_ops;
  
  static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
  {
  	struct vxlan_dev *vxlan = netdev_priv(vport->dev);
  	__be16 dst_port = vxlan->cfg.dst_port;
  
  	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
  		return -EMSGSIZE;
  
  	if (vxlan->flags & VXLAN_F_GBP) {
  		struct nlattr *exts;
  
  		exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
  		if (!exts)
  			return -EMSGSIZE;
  
  		if (vxlan->flags & VXLAN_F_GBP &&
  		    nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
  			return -EMSGSIZE;
  
  		nla_nest_end(skb, exts);
  	}
  
  	return 0;
  }
  
  static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
  	[OVS_VXLAN_EXT_GBP]	= { .type = NLA_FLAG, },
  };
  
  static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
  				struct vxlan_config *conf)
  {
  	struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
  	int err;
  
  	if (nla_len(attr) < sizeof(struct nlattr))
  		return -EINVAL;
  
  	err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
  	if (err < 0)
  		return err;
  
  	if (exts[OVS_VXLAN_EXT_GBP])
  		conf->flags |= VXLAN_F_GBP;
  
  	return 0;
  }
  
  static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
  {
  	struct net *net = ovs_dp_get_net(parms->dp);
  	struct nlattr *options = parms->options;
  	struct net_device *dev;
  	struct vport *vport;
  	struct nlattr *a;
  	int err;
  	struct vxlan_config conf = {
  		.no_share = true,
  		.flags = VXLAN_F_COLLECT_METADATA,
  	};
  
  	if (!options) {
  		err = -EINVAL;
  		goto error;
  	}
  
  	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
  	if (a && nla_len(a) == sizeof(u16)) {
  		conf.dst_port = htons(nla_get_u16(a));
  	} else {
  		/* Require destination port from userspace. */
  		err = -EINVAL;
  		goto error;
  	}
  
  	vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
  	if (IS_ERR(vport))
  		return vport;
  
  	a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
  	if (a) {
  		err = vxlan_configure_exts(vport, a, &conf);
  		if (err) {
  			ovs_vport_free(vport);
  			goto error;
  		}
  	}
  
  	rtnl_lock();
  	dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
  	if (IS_ERR(dev)) {
  		rtnl_unlock();
  		ovs_vport_free(vport);
  		return ERR_CAST(dev);
  	}
  
  	dev_change_flags(dev, dev->flags | IFF_UP);
  	rtnl_unlock();
  	return vport;
  error:
  	return ERR_PTR(err);
  }
  
  static struct vport *vxlan_create(const struct vport_parms *parms)
  {
  	struct vport *vport;
  
  	vport = vxlan_tnl_create(parms);
  	if (IS_ERR(vport))
  		return vport;
  
  	return ovs_netdev_link(vport, parms->name);
  }
  
  static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
  				     struct dp_upcall_info *upcall)
  {
  	struct vxlan_dev *vxlan = netdev_priv(vport->dev);
  	struct net *net = ovs_dp_get_net(vport->dp);
  	__be16 dst_port = vxlan_dev_dst_port(vxlan);
  	__be16 src_port;
  	int port_min;
  	int port_max;
  
  	inet_get_local_port_range(net, &port_min, &port_max);
  	src_port = udp_flow_src_port(net, skb, 0, 0, true);
  
  	return ovs_tunnel_get_egress_info(upcall, net,
  					  skb, IPPROTO_UDP,
  					  src_port, dst_port);
  }
  
  static struct vport_ops ovs_vxlan_netdev_vport_ops = {
  	.type			= OVS_VPORT_TYPE_VXLAN,
  	.create			= vxlan_create,
  	.destroy		= ovs_netdev_tunnel_destroy,
  	.get_options		= vxlan_get_options,
  	.send			= vxlan_xmit,
  	.get_egress_tun_info	= vxlan_get_egress_tun_info,
  };
  
  static int __init ovs_vxlan_tnl_init(void)
  {
  	return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
  }
  
  static void __exit ovs_vxlan_tnl_exit(void)
  {
  	ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
  }
  
  module_init(ovs_vxlan_tnl_init);
  module_exit(ovs_vxlan_tnl_exit);
  
  MODULE_DESCRIPTION("OVS: VXLAN switching port");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("vport-type-4");
  