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 err = dev_change_flags(dev, dev->flags | IFF_UP); 134 if (err < 0) { 135 rtnl_delete_link(dev); 136 rtnl_unlock(); 137 ovs_vport_free(vport); 138 goto error; 139 } 140 141 rtnl_unlock(); 142 return vport; 143 error: 144 return ERR_PTR(err); 145 } 146 147 static struct vport *vxlan_create(const struct vport_parms *parms) 148 { 149 struct vport *vport; 150 151 vport = vxlan_tnl_create(parms); 152 if (IS_ERR(vport)) 153 return vport; 154 155 return ovs_netdev_link(vport, parms->name); 156 } 157 158 static struct vport_ops ovs_vxlan_netdev_vport_ops = { 159 .type = OVS_VPORT_TYPE_VXLAN, 160 .create = vxlan_create, 161 .destroy = ovs_netdev_tunnel_destroy, 162 .get_options = vxlan_get_options, 163 .send = dev_queue_xmit, 164 }; 165 166 static int __init ovs_vxlan_tnl_init(void) 167 { 168 return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops); 169 } 170 171 static void __exit ovs_vxlan_tnl_exit(void) 172 { 173 ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops); 174 } 175 176 module_init(ovs_vxlan_tnl_init); 177 module_exit(ovs_vxlan_tnl_exit); 178 179 MODULE_DESCRIPTION("OVS: VXLAN switching port"); 180 MODULE_LICENSE("GPL"); 181 MODULE_ALIAS("vport-type-4"); 182