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->cfg.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->cfg.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                                NULL);
  75         if (err < 0)
  76                 return err;
  77
  78         if (exts[OVS_VXLAN_EXT_GBP])
  79                 conf->flags |= VXLAN_F_GBP;
  80
  81         return 0;
  82 }
  83
  84 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
  85 {
  86         struct net *net = ovs_dp_get_net(parms->dp);
  87         struct nlattr *options = parms->options;
  88         struct net_device *dev;
  89         struct vport *vport;
  90         struct nlattr *a;
  91         int err;
  92         struct vxlan_config conf = {
  93                 .no_share = true,
  94                 .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
  95                 /* Don't restrict the packets that can be sent by MTU */
  96                 .mtu = IP_MAX_MTU,
  97         };
  98
  99         if (!options) {
 100                 err = -EINVAL;
 101                 goto error;
 102         }
 103
 104         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
 105         if (a && nla_len(a) == sizeof(u16)) {
 106                 conf.dst_port = htons(nla_get_u16(a));
 107         } else {
 108                 /* Require destination port from userspace. */
 109                 err = -EINVAL;
 110                 goto error;
 111         }
 112
 113         vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
 114         if (IS_ERR(vport))
 115                 return vport;
 116
 117         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
 118         if (a) {
 119                 err = vxlan_configure_exts(vport, a, &conf);
 120                 if (err) {
 121                         ovs_vport_free(vport);
 122                         goto error;
 123                 }
 124         }
 125
 126         rtnl_lock();
 127         dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
 128         if (IS_ERR(dev)) {
 129                 rtnl_unlock();
 130                 ovs_vport_free(vport);
 131                 return ERR_CAST(dev);
 132         }
 133
 134         err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
 135         if (err < 0) {
 136                 rtnl_delete_link(dev);
 137                 rtnl_unlock();
 138                 ovs_vport_free(vport);
 139                 goto error;
 140         }
 141
 142         rtnl_unlock();
 143         return vport;
 144 error:
 145         return ERR_PTR(err);
 146 }
 147
 148 static struct vport *vxlan_create(const struct vport_parms *parms)
 149 {
 150         struct vport *vport;
 151
 152         vport = vxlan_tnl_create(parms);
 153         if (IS_ERR(vport))
 154                 return vport;
 155
 156         return ovs_netdev_link(vport, parms->name);
 157 }
 158
 159 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
 160         .type                   = OVS_VPORT_TYPE_VXLAN,
 161         .create                 = vxlan_create,
 162         .destroy                = ovs_netdev_tunnel_destroy,
 163         .get_options            = vxlan_get_options,
 164         .send                   = dev_queue_xmit,
 165 };
 166
 167 static int __init ovs_vxlan_tnl_init(void)
 168 {
 169         return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
 170 }
 171
 172 static void __exit ovs_vxlan_tnl_exit(void)
 173 {
 174         ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
 175 }
 176
 177 module_init(ovs_vxlan_tnl_init);
 178 module_exit(ovs_vxlan_tnl_exit);
 179
 180 MODULE_DESCRIPTION("OVS: VXLAN switching port");
 181 MODULE_LICENSE("GPL");
 182 MODULE_ALIAS("vport-type-4");