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 | VXLAN_F_UDP_ZERO_CSUM6_RX,
  94                 /* Don't restrict the packets that can be sent by MTU */
  95                 .mtu = IP_MAX_MTU,
  96         };
  97
  98         if (!options) {
  99                 err = -EINVAL;
 100                 goto error;
 101         }
 102
 103         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
 104         if (a && nla_len(a) == sizeof(u16)) {
 105                 conf.dst_port = htons(nla_get_u16(a));
 106         } else {
 107                 /* Require destination port from userspace. */
 108                 err = -EINVAL;
 109                 goto error;
 110         }
 111
 112         vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
 113         if (IS_ERR(vport))
 114                 return vport;
 115
 116         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
 117         if (a) {
 118                 err = vxlan_configure_exts(vport, a, &conf);
 119                 if (err) {
 120                         ovs_vport_free(vport);
 121                         goto error;
 122                 }
 123         }
 124
 125         rtnl_lock();
 126         dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
 127         if (IS_ERR(dev)) {
 128                 rtnl_unlock();
 129                 ovs_vport_free(vport);
 130                 return ERR_CAST(dev);
 131         }
 132
 133         dev_change_flags(dev, dev->flags | IFF_UP);
 134         rtnl_unlock();
 135         return vport;
 136 error:
 137         return ERR_PTR(err);
 138 }
 139
 140 static struct vport *vxlan_create(const struct vport_parms *parms)
 141 {
 142         struct vport *vport;
 143
 144         vport = vxlan_tnl_create(parms);
 145         if (IS_ERR(vport))
 146                 return vport;
 147
 148         return ovs_netdev_link(vport, parms->name);
 149 }
 150
 151 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
 152         .type                   = OVS_VPORT_TYPE_VXLAN,
 153         .create                 = vxlan_create,
 154         .destroy                = ovs_netdev_tunnel_destroy,
 155         .get_options            = vxlan_get_options,
 156         .send                   = dev_queue_xmit,
 157 };
 158
 159 static int __init ovs_vxlan_tnl_init(void)
 160 {
 161         return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
 162 }
 163
 164 static void __exit ovs_vxlan_tnl_exit(void)
 165 {
 166         ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
 167 }
 168
 169 module_init(ovs_vxlan_tnl_init);
 170 module_exit(ovs_vxlan_tnl_exit);
 171
 172 MODULE_DESCRIPTION("OVS: VXLAN switching port");
 173 MODULE_LICENSE("GPL");
 174 MODULE_ALIAS("vport-type-4");