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_FLOW_BASED | 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 void vxlan_destroy(struct vport *vport) 150 { 151 rtnl_lock(); 152 if (vport->dev->priv_flags & IFF_OVS_DATAPATH) 153 ovs_netdev_detach_dev(vport); 154 155 /* Early release so we can unregister the device */ 156 dev_put(vport->dev); 157 rtnl_delete_link(vport->dev); 158 vport->dev = NULL; 159 rtnl_unlock(); 160 161 call_rcu(&vport->rcu, ovs_vport_free_rcu); 162 } 163 164 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, 165 struct ip_tunnel_info *egress_tun_info) 166 { 167 struct vxlan_dev *vxlan = netdev_priv(vport->dev); 168 struct net *net = ovs_dp_get_net(vport->dp); 169 __be16 dst_port = vxlan_dev_dst_port(vxlan); 170 __be16 src_port; 171 int port_min; 172 int port_max; 173 174 inet_get_local_port_range(net, &port_min, &port_max); 175 src_port = udp_flow_src_port(net, skb, 0, 0, true); 176 177 return ovs_tunnel_get_egress_info(egress_tun_info, net, 178 OVS_CB(skb)->egress_tun_info, 179 IPPROTO_UDP, skb->mark, 180 src_port, dst_port); 181 } 182 183 static struct vport_ops ovs_vxlan_netdev_vport_ops = { 184 .type = OVS_VPORT_TYPE_VXLAN, 185 .create = vxlan_create, 186 .destroy = vxlan_destroy, 187 .get_options = vxlan_get_options, 188 .send = ovs_netdev_send, 189 .get_egress_tun_info = vxlan_get_egress_tun_info, 190 }; 191 192 static int __init ovs_vxlan_tnl_init(void) 193 { 194 return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops); 195 } 196 197 static void __exit ovs_vxlan_tnl_exit(void) 198 { 199 ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops); 200 } 201 202 module_init(ovs_vxlan_tnl_init); 203 module_exit(ovs_vxlan_tnl_exit); 204 205 MODULE_DESCRIPTION("OVS: VXLAN switching port"); 206 MODULE_LICENSE("GPL"); 207 MODULE_ALIAS("vport-type-4"); 208