1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2012 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/if_arp.h> 9 #include <linux/if_bridge.h> 10 #include <linux/if_vlan.h> 11 #include <linux/kernel.h> 12 #include <linux/llc.h> 13 #include <linux/rtnetlink.h> 14 #include <linux/skbuff.h> 15 #include <linux/openvswitch.h> 16 #include <linux/export.h> 17 18 #include <net/ip_tunnels.h> 19 #include <net/rtnetlink.h> 20 21 #include "datapath.h" 22 #include "vport.h" 23 #include "vport-internal_dev.h" 24 #include "vport-netdev.h" 25 26 static struct vport_ops ovs_netdev_vport_ops; 27 28 /* Must be called with rcu_read_lock. */ 29 static void netdev_port_receive(struct sk_buff *skb) 30 { 31 struct vport *vport; 32 33 vport = ovs_netdev_get_vport(skb->dev); 34 if (unlikely(!vport)) 35 goto error; 36 37 if (unlikely(skb_warn_if_lro(skb))) 38 goto error; 39 40 /* Make our own copy of the packet. Otherwise we will mangle the 41 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). 42 */ 43 skb = skb_share_check(skb, GFP_ATOMIC); 44 if (unlikely(!skb)) 45 return; 46 47 if (skb->dev->type == ARPHRD_ETHER) 48 skb_push_rcsum(skb, ETH_HLEN); 49 50 ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); 51 return; 52 error: 53 kfree_skb(skb); 54 } 55 56 /* Called with rcu_read_lock and bottom-halves disabled. */ 57 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) 58 { 59 struct sk_buff *skb = *pskb; 60 61 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 62 return RX_HANDLER_PASS; 63 64 netdev_port_receive(skb); 65 return RX_HANDLER_CONSUMED; 66 } 67 68 static struct net_device *get_dpdev(const struct datapath *dp) 69 { 70 struct vport *local; 71 72 local = ovs_vport_ovsl(dp, OVSP_LOCAL); 73 return local->dev; 74 } 75 76 struct vport *ovs_netdev_link(struct vport *vport, bool tunnel) 77 { 78 int err; 79 80 if (WARN_ON_ONCE(!vport->dev)) { 81 err = -ENODEV; 82 goto error_free_vport; 83 } 84 85 rtnl_lock(); 86 err = netdev_master_upper_dev_link(vport->dev, 87 get_dpdev(vport->dp), 88 NULL, NULL, NULL); 89 if (err) 90 goto error_put_unlock; 91 92 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, 93 vport); 94 if (err) 95 goto error_master_upper_dev_unlink; 96 97 dev_disable_lro(vport->dev); 98 dev_set_promiscuity(vport->dev, 1); 99 vport->dev->priv_flags |= IFF_OVS_DATAPATH; 100 rtnl_unlock(); 101 102 return vport; 103 104 error_master_upper_dev_unlink: 105 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); 106 error_put_unlock: 107 if (tunnel && vport->dev->reg_state == NETREG_REGISTERED) 108 rtnl_delete_link(vport->dev, 0, NULL); 109 netdev_put(vport->dev, &vport->dev_tracker); 110 rtnl_unlock(); 111 error_free_vport: 112 ovs_vport_free(vport); 113 return ERR_PTR(err); 114 } 115 EXPORT_SYMBOL_GPL(ovs_netdev_link); 116 117 static struct vport *netdev_create(const struct vport_parms *parms) 118 { 119 struct vport *vport; 120 int err; 121 122 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); 123 if (IS_ERR(vport)) 124 return vport; 125 126 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); 127 if (!vport->dev) { 128 err = -ENODEV; 129 goto error_free_vport; 130 } 131 netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL); 132 133 /* Ensure that the provided name is not an alias. */ 134 if (strcmp(parms->name, ovs_vport_name(vport))) { 135 err = -ENODEV; 136 goto error_put; 137 } 138 139 if (vport->dev->flags & IFF_LOOPBACK || 140 (vport->dev->type != ARPHRD_ETHER && 141 vport->dev->type != ARPHRD_NONE) || 142 ovs_is_internal_dev(vport->dev)) { 143 err = -EINVAL; 144 goto error_put; 145 } 146 147 return ovs_netdev_link(vport, false); 148 error_put: 149 netdev_put(vport->dev, &vport->dev_tracker); 150 error_free_vport: 151 ovs_vport_free(vport); 152 return ERR_PTR(err); 153 } 154 155 static void vport_netdev_free(struct rcu_head *rcu) 156 { 157 struct vport *vport = container_of(rcu, struct vport, rcu); 158 159 netdev_put(vport->dev, &vport->dev_tracker); 160 ovs_vport_free(vport); 161 } 162 163 void ovs_netdev_detach_dev(struct vport *vport) 164 { 165 ASSERT_RTNL(); 166 netdev_rx_handler_unregister(vport->dev); 167 netdev_upper_dev_unlink(vport->dev, 168 netdev_master_upper_dev_get(vport->dev)); 169 dev_set_promiscuity(vport->dev, -1); 170 171 /* paired with smp_mb() in netdev_destroy() */ 172 smp_wmb(); 173 174 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 175 } 176 177 static void netdev_destroy(struct vport *vport) 178 { 179 /* When called from ovs_db_notify_wq() after a dp_device_event(), the 180 * port has already been detached, so we can avoid taking the RTNL by 181 * checking this first. 182 */ 183 if (netif_is_ovs_port(vport->dev)) { 184 rtnl_lock(); 185 /* Check again while holding the lock to ensure we don't race 186 * with the netdev notifier and detach twice. 187 */ 188 if (netif_is_ovs_port(vport->dev)) 189 ovs_netdev_detach_dev(vport); 190 rtnl_unlock(); 191 } 192 193 /* paired with smp_wmb() in ovs_netdev_detach_dev() */ 194 smp_mb(); 195 196 call_rcu(&vport->rcu, vport_netdev_free); 197 } 198 199 void ovs_netdev_tunnel_destroy(struct vport *vport) 200 { 201 rtnl_lock(); 202 if (netif_is_ovs_port(vport->dev)) 203 ovs_netdev_detach_dev(vport); 204 205 /* We can be invoked by both explicit vport deletion and 206 * underlying netdev deregistration; delete the link only 207 * if it's not already shutting down. 208 */ 209 if (vport->dev->reg_state == NETREG_REGISTERED) 210 rtnl_delete_link(vport->dev, 0, NULL); 211 212 /* We can't put the device reference yet, since it can still be in 213 * use, but rtnl_unlock()->netdev_run_todo() will block until all 214 * the references are released, so the RCU call must be before it. 215 */ 216 call_rcu(&vport->rcu, vport_netdev_free); 217 rtnl_unlock(); 218 } 219 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); 220 221 /* Returns null if this device is not attached to a datapath. */ 222 struct vport *ovs_netdev_get_vport(struct net_device *dev) 223 { 224 if (likely(netif_is_ovs_port(dev))) 225 return (struct vport *) 226 rcu_dereference_rtnl(dev->rx_handler_data); 227 else 228 return NULL; 229 } 230 231 static struct vport_ops ovs_netdev_vport_ops = { 232 .type = OVS_VPORT_TYPE_NETDEV, 233 .create = netdev_create, 234 .destroy = netdev_destroy, 235 .send = dev_queue_xmit, 236 }; 237 238 int __init ovs_netdev_init(void) 239 { 240 return ovs_vport_ops_register(&ovs_netdev_vport_ops); 241 } 242 243 void ovs_netdev_exit(void) 244 { 245 ovs_vport_ops_unregister(&ovs_netdev_vport_ops); 246 } 247