net/openvswitch/vport-vxlan.c

   1 /*
   2  * Copyright (c) 2014 Nicira, Inc.
   3  * Copyright (c) 2013 Cisco Systems, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/openvswitch.h>
  23 #include <linux/module.h>
  24 #include <net/udp.h>
  25 #include <net/ip_tunnels.h>
  26 #include <net/rtnetlink.h>
  27 #include <net/vxlan.h>
  28
  29 #include "datapath.h"
  30 #include "vport.h"
  31 #include "vport-netdev.h"
  32
  33 static struct vport_ops ovs_vxlan_netdev_vport_ops;
  34
  35 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
  36 {
  37         struct vxlan_dev *vxlan = netdev_priv(vport->dev);
  38         __be16 dst_port = vxlan->cfg.dst_port;
  39
  40         if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
  41                 return -EMSGSIZE;
  42
  43         if (vxlan->flags & VXLAN_F_GBP) {
  44                 struct nlattr *exts;
  45
  46                 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
  47                 if (!exts)
  48                         return -EMSGSIZE;
  49
  50                 if (vxlan->flags & VXLAN_F_GBP &&
  51                     nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
  52                         return -EMSGSIZE;
  53
  54                 nla_nest_end(skb, exts);
  55         }
  56
  57         return 0;
  58 }
  59
  60 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
  61         [OVS_VXLAN_EXT_GBP]     = { .type = NLA_FLAG, },
  62 };
  63
  64 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
  65                                 struct vxlan_config *conf)
  66 {
  67         struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
  68         int err;
  69
  70         if (nla_len(attr) < sizeof(struct nlattr))
  71                 return -EINVAL;
  72
  73         err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
  74         if (err < 0)
  75                 return err;
  76
  77         if (exts[OVS_VXLAN_EXT_GBP])
  78                 conf->flags |= VXLAN_F_GBP;
  79
  80         return 0;
  81 }
  82
  83 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
  84 {
  85         struct net *net = ovs_dp_get_net(parms->dp);
  86         struct nlattr *options = parms->options;
  87         struct net_device *dev;
  88         struct vport *vport;
  89         struct nlattr *a;
  90         int err;
  91         struct vxlan_config conf = {
  92                 .no_share = true,
  93                 .flags = VXLAN_F_COLLECT_METADATA,
  94         };
  95
  96         if (!options) {
  97                 err = -EINVAL;
  98                 goto error;
  99         }
 100
 101         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
 102         if (a && nla_len(a) == sizeof(u16)) {
 103                 conf.dst_port = htons(nla_get_u16(a));
 104         } else {
 105                 /* Require destination port from userspace. */
 106                 err = -EINVAL;
 107                 goto error;
 108         }
 109
 110         vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
 111         if (IS_ERR(vport))
 112                 return vport;
 113
 114         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
 115         if (a) {
 116                 err = vxlan_configure_exts(vport, a, &conf);
 117                 if (err) {
 118                         ovs_vport_free(vport);
 119                         goto error;
 120                 }
 121         }
 122
 123         rtnl_lock();
 124         dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
 125         if (IS_ERR(dev)) {
 126                 rtnl_unlock();
 127                 ovs_vport_free(vport);
 128                 return ERR_CAST(dev);
 129         }
 130
 131         dev_change_flags(dev, dev->flags | IFF_UP);
 132         rtnl_unlock();
 133         return vport;
 134 error:
 135         return ERR_PTR(err);
 136 }
 137
 138 static struct vport *vxlan_create(const struct vport_parms *parms)
 139 {
 140         struct vport *vport;
 141
 142         vport = vxlan_tnl_create(parms);
 143         if (IS_ERR(vport))
 144                 return vport;
 145
 146         return ovs_netdev_link(vport, parms->name);
 147 }
 148
 149 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
 150                                      struct dp_upcall_info *upcall)
 151 {
 152         struct vxlan_dev *vxlan = netdev_priv(vport->dev);
 153         struct net *net = ovs_dp_get_net(vport->dp);
 154         __be16 dst_port = vxlan_dev_dst_port(vxlan);
 155         __be16 src_port;
 156         int port_min;
 157         int port_max;
 158
 159         inet_get_local_port_range(net, &port_min, &port_max);
 160         src_port = udp_flow_src_port(net, skb, 0, 0, true);
 161
 162         return ovs_tunnel_get_egress_info(upcall, net,
 163                                           skb, IPPROTO_UDP,
 164                                           src_port, dst_port);
 165 }
 166
 167 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
 168         .type                   = OVS_VPORT_TYPE_VXLAN,
 169         .create                 = vxlan_create,
 170         .destroy                = ovs_netdev_tunnel_destroy,
 171         .get_options            = vxlan_get_options,
 172         .send                   = ovs_netdev_send,
 173         .get_egress_tun_info    = vxlan_get_egress_tun_info,
 174 };
 175
 176 static int __init ovs_vxlan_tnl_init(void)
 177 {
 178         return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
 179 }
 180
 181 static void __exit ovs_vxlan_tnl_exit(void)
 182 {
 183         ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
 184 }
 185
 186 module_init(ovs_vxlan_tnl_init);
 187 module_exit(ovs_vxlan_tnl_exit);
 188
 189 MODULE_DESCRIPTION("OVS: VXLAN switching port");
 190 MODULE_LICENSE("GPL");
 191 MODULE_ALIAS("vport-type-4");