datapath/vport-vxlan.c

   1 /*
   2  * Copyright (c) 2015,2017 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 #ifdef HAVE_VXLAN_DEV_CFG
  44         if (vxlan->cfg.flags & VXLAN_F_GBP) {
  45 #else
  46         if (vxlan->flags & VXLAN_F_GBP) {
  47 #endif
  48                 struct nlattr *exts;
  49
  50                 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
  51                 if (!exts)
  52                         return -EMSGSIZE;
  53
  54 #ifdef HAVE_VXLAN_DEV_CFG
  55                 if (vxlan->cfg.flags & VXLAN_F_GBP &&
  56 #else
  57                 if (vxlan->flags & VXLAN_F_GBP &&
  58 #endif
  59                     nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
  60                         return -EMSGSIZE;
  61
  62                 nla_nest_end(skb, exts);
  63 #ifdef HAVE_VXLAN_DEV_CFG
  64         } else if (vxlan->cfg.flags & VXLAN_F_GPE) {
  65 #else
  66         } else if (vxlan->flags & VXLAN_F_GPE) {
  67 #endif
  68                 struct nlattr *exts;
  69
  70                 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
  71                 if (!exts)
  72                         return -EMSGSIZE;
  73
  74 #ifdef HAVE_VXLAN_DEV_CFG
  75                 if (vxlan->cfg.flags & VXLAN_F_GPE &&
  76 #else
  77                 if (vxlan->flags & VXLAN_F_GPE &&
  78 #endif
  79                     nla_put_flag(skb, OVS_VXLAN_EXT_GPE))
  80                         return -EMSGSIZE;
  81
  82                 nla_nest_end(skb, exts);
  83         }
  84
  85         return 0;
  86 }
  87
  88 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
  89         [OVS_VXLAN_EXT_GBP]     = { .type = NLA_FLAG, },
  90         [OVS_VXLAN_EXT_GPE]     = { .type = NLA_FLAG, },
  91 };
  92
  93 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
  94                                 struct vxlan_config *conf)
  95 {
  96         struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
  97         int err;
  98
  99         if (nla_len(attr) < sizeof(struct nlattr))
 100                 return -EINVAL;
 101
 102         err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy,
 103                                NULL);
 104         if (err < 0)
 105                 return err;
 106
 107         if (exts[OVS_VXLAN_EXT_GBP])
 108                 conf->flags |= VXLAN_F_GBP;
 109         else if (exts[OVS_VXLAN_EXT_GPE])
 110                 conf->flags |= VXLAN_F_GPE;
 111
 112         return 0;
 113 }
 114
 115 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
 116 {
 117         struct net *net = ovs_dp_get_net(parms->dp);
 118         struct nlattr *options = parms->options;
 119         struct net_device *dev;
 120         struct vport *vport;
 121         struct nlattr *a;
 122         int err;
 123         struct vxlan_config conf = {
 124                 .no_share = true,
 125                 .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
 126                 /* Don't restrict the packets that can be sent by MTU */
 127                 .mtu = IP_MAX_MTU,
 128         };
 129
 130         if (!options) {
 131                 err = -EINVAL;
 132                 goto error;
 133         }
 134
 135         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
 136         if (a && nla_len(a) == sizeof(u16)) {
 137                 conf.dst_port = htons(nla_get_u16(a));
 138         } else {
 139                 /* Require destination port from userspace. */
 140                 err = -EINVAL;
 141                 goto error;
 142         }
 143
 144         vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
 145         if (IS_ERR(vport))
 146                 return vport;
 147
 148         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
 149         if (a) {
 150                 err = vxlan_configure_exts(vport, a, &conf);
 151                 if (err) {
 152                         ovs_vport_free(vport);
 153                         goto error;
 154                 }
 155         }
 156
 157         rtnl_lock();
 158         dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
 159         if (IS_ERR(dev)) {
 160                 rtnl_unlock();
 161                 ovs_vport_free(vport);
 162                 return ERR_CAST(dev);
 163         }
 164
 165         err = dev_change_flags(dev, dev->flags | IFF_UP);
 166         if (err < 0) {
 167                 rtnl_delete_link(dev);
 168                 rtnl_unlock();
 169                 ovs_vport_free(vport);
 170                 goto error;
 171         }
 172
 173         rtnl_unlock();
 174         return vport;
 175 error:
 176         return ERR_PTR(err);
 177 }
 178
 179 static struct vport *vxlan_create(const struct vport_parms *parms)
 180 {
 181         struct vport *vport;
 182
 183         vport = vxlan_tnl_create(parms);
 184         if (IS_ERR(vport))
 185                 return vport;
 186
 187         return ovs_netdev_link(vport, parms->name);
 188 }
 189
 190 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
 191         .type                   = OVS_VPORT_TYPE_VXLAN,
 192         .create                 = vxlan_create,
 193         .destroy                = ovs_netdev_tunnel_destroy,
 194         .get_options            = vxlan_get_options,
 195 #ifndef USE_UPSTREAM_TUNNEL
 196         .fill_metadata_dst      = vxlan_fill_metadata_dst,
 197 #endif
 198         .send                   = vxlan_xmit,
 199 };
 200
 201 static int __init ovs_vxlan_tnl_init(void)
 202 {
 203         return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
 204 }
 205
 206 static void __exit ovs_vxlan_tnl_exit(void)
 207 {
 208         ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
 209 }
 210
 211 module_init(ovs_vxlan_tnl_init);
 212 module_exit(ovs_vxlan_tnl_exit);
 213
 214 MODULE_DESCRIPTION("OVS: VXLAN switching port");
 215 MODULE_LICENSE("GPL");
 216 MODULE_ALIAS("vport-type-4");