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, const char *name) 77 { 78 int err; 79 80 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); 81 /* Ensure that the device exists and that the provided 82 * name is not one of its aliases. 83 */ 84 if (!vport->dev || strcmp(name, ovs_vport_name(vport))) { 85 err = -ENODEV; 86 goto error_free_vport; 87 } 88 netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL); 89 if (vport->dev->flags & IFF_LOOPBACK || 90 (vport->dev->type != ARPHRD_ETHER && 91 vport->dev->type != ARPHRD_NONE) || 92 ovs_is_internal_dev(vport->dev)) { 93 err = -EINVAL; 94 goto error_put; 95 } 96 97 rtnl_lock(); 98 err = netdev_master_upper_dev_link(vport->dev, 99 get_dpdev(vport->dp), 100 NULL, NULL, NULL); 101 if (err) 102 goto error_unlock; 103 104 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, 105 vport); 106 if (err) 107 goto error_master_upper_dev_unlink; 108 109 dev_disable_lro(vport->dev); 110 dev_set_promiscuity(vport->dev, 1); 111 vport->dev->priv_flags |= IFF_OVS_DATAPATH; 112 rtnl_unlock(); 113 114 return vport; 115 116 error_master_upper_dev_unlink: 117 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); 118 error_unlock: 119 rtnl_unlock(); 120 error_put: 121 netdev_put(vport->dev, &vport->dev_tracker); 122 error_free_vport: 123 ovs_vport_free(vport); 124 return ERR_PTR(err); 125 } 126 EXPORT_SYMBOL_GPL(ovs_netdev_link); 127 128 static struct vport *netdev_create(const struct vport_parms *parms) 129 { 130 struct vport *vport; 131 132 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); 133 if (IS_ERR(vport)) 134 return vport; 135 136 return ovs_netdev_link(vport, parms->name); 137 } 138 139 static void vport_netdev_free(struct rcu_head *rcu) 140 { 141 struct vport *vport = container_of(rcu, struct vport, rcu); 142 143 netdev_put(vport->dev, &vport->dev_tracker); 144 ovs_vport_free(vport); 145 } 146 147 void ovs_netdev_detach_dev(struct vport *vport) 148 { 149 ASSERT_RTNL(); 150 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 151 netdev_rx_handler_unregister(vport->dev); 152 netdev_upper_dev_unlink(vport->dev, 153 netdev_master_upper_dev_get(vport->dev)); 154 dev_set_promiscuity(vport->dev, -1); 155 } 156 157 static void netdev_destroy(struct vport *vport) 158 { 159 rtnl_lock(); 160 if (netif_is_ovs_port(vport->dev)) 161 ovs_netdev_detach_dev(vport); 162 rtnl_unlock(); 163 164 call_rcu(&vport->rcu, vport_netdev_free); 165 } 166 167 void ovs_netdev_tunnel_destroy(struct vport *vport) 168 { 169 rtnl_lock(); 170 if (netif_is_ovs_port(vport->dev)) 171 ovs_netdev_detach_dev(vport); 172 173 /* We can be invoked by both explicit vport deletion and 174 * underlying netdev deregistration; delete the link only 175 * if it's not already shutting down. 176 */ 177 if (vport->dev->reg_state == NETREG_REGISTERED) 178 rtnl_delete_link(vport->dev, 0, NULL); 179 netdev_put(vport->dev, &vport->dev_tracker); 180 vport->dev = NULL; 181 rtnl_unlock(); 182 183 call_rcu(&vport->rcu, vport_netdev_free); 184 } 185 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); 186 187 /* Returns null if this device is not attached to a datapath. */ 188 struct vport *ovs_netdev_get_vport(struct net_device *dev) 189 { 190 if (likely(netif_is_ovs_port(dev))) 191 return (struct vport *) 192 rcu_dereference_rtnl(dev->rx_handler_data); 193 else 194 return NULL; 195 } 196 197 static struct vport_ops ovs_netdev_vport_ops = { 198 .type = OVS_VPORT_TYPE_NETDEV, 199 .create = netdev_create, 200 .destroy = netdev_destroy, 201 .send = dev_queue_xmit, 202 }; 203 204 int __init ovs_netdev_init(void) 205 { 206 return ovs_vport_ops_register(&ovs_netdev_vport_ops); 207 } 208 209 void ovs_netdev_exit(void) 210 { 211 ovs_vport_ops_unregister(&ovs_netdev_vport_ops); 212 } 213