1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2012 Nicira, Inc. 4 */ 5 6 #include <linux/if_vlan.h> 7 #include <linux/kernel.h> 8 #include <linux/netdevice.h> 9 #include <linux/etherdevice.h> 10 #include <linux/ethtool.h> 11 #include <linux/skbuff.h> 12 13 #include <net/dst.h> 14 #include <net/xfrm.h> 15 #include <net/rtnetlink.h> 16 17 #include "datapath.h" 18 #include "vport-internal_dev.h" 19 #include "vport-netdev.h" 20 21 struct internal_dev { 22 struct vport *vport; 23 }; 24 25 static struct vport_ops ovs_internal_vport_ops; 26 27 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 28 { 29 return netdev_priv(netdev); 30 } 31 32 /* Called with rcu_read_lock_bh. */ 33 static netdev_tx_t 34 internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 35 { 36 int len, err; 37 38 /* store len value because skb can be freed inside ovs_vport_receive() */ 39 len = skb->len; 40 41 rcu_read_lock(); 42 err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); 43 rcu_read_unlock(); 44 45 if (likely(!err)) 46 dev_sw_netstats_tx_add(netdev, 1, len); 47 else 48 netdev->stats.tx_errors++; 49 50 return NETDEV_TX_OK; 51 } 52 53 static int internal_dev_open(struct net_device *netdev) 54 { 55 netif_start_queue(netdev); 56 return 0; 57 } 58 59 static int internal_dev_stop(struct net_device *netdev) 60 { 61 netif_stop_queue(netdev); 62 return 0; 63 } 64 65 static void internal_dev_getinfo(struct net_device *netdev, 66 struct ethtool_drvinfo *info) 67 { 68 strlcpy(info->driver, "openvswitch", sizeof(info->driver)); 69 } 70 71 static const struct ethtool_ops internal_dev_ethtool_ops = { 72 .get_drvinfo = internal_dev_getinfo, 73 .get_link = ethtool_op_get_link, 74 }; 75 76 static void internal_dev_destructor(struct net_device *dev) 77 { 78 struct vport *vport = ovs_internal_dev_get_vport(dev); 79 80 ovs_vport_free(vport); 81 } 82 83 static const struct net_device_ops internal_dev_netdev_ops = { 84 .ndo_open = internal_dev_open, 85 .ndo_stop = internal_dev_stop, 86 .ndo_start_xmit = internal_dev_xmit, 87 .ndo_set_mac_address = eth_mac_addr, 88 .ndo_get_stats64 = dev_get_tstats64, 89 }; 90 91 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 92 .kind = "openvswitch", 93 }; 94 95 static void do_setup(struct net_device *netdev) 96 { 97 ether_setup(netdev); 98 99 netdev->max_mtu = ETH_MAX_MTU; 100 101 netdev->netdev_ops = &internal_dev_netdev_ops; 102 103 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 104 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | 105 IFF_NO_QUEUE; 106 netdev->needs_free_netdev = true; 107 netdev->priv_destructor = NULL; 108 netdev->ethtool_ops = &internal_dev_ethtool_ops; 109 netdev->rtnl_link_ops = &internal_dev_link_ops; 110 111 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 112 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 113 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 114 115 netdev->vlan_features = netdev->features; 116 netdev->hw_enc_features = netdev->features; 117 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 118 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 119 120 eth_hw_addr_random(netdev); 121 } 122 123 static struct vport *internal_dev_create(const struct vport_parms *parms) 124 { 125 struct vport *vport; 126 struct internal_dev *internal_dev; 127 struct net_device *dev; 128 int err; 129 130 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 131 if (IS_ERR(vport)) { 132 err = PTR_ERR(vport); 133 goto error; 134 } 135 136 dev = alloc_netdev(sizeof(struct internal_dev), 137 parms->name, NET_NAME_USER, do_setup); 138 vport->dev = dev; 139 if (!vport->dev) { 140 err = -ENOMEM; 141 goto error_free_vport; 142 } 143 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 144 if (!vport->dev->tstats) { 145 err = -ENOMEM; 146 goto error_free_netdev; 147 } 148 149 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 150 internal_dev = internal_dev_priv(vport->dev); 151 internal_dev->vport = vport; 152 153 /* Restrict bridge port to current netns. */ 154 if (vport->port_no == OVSP_LOCAL) 155 vport->dev->features |= NETIF_F_NETNS_LOCAL; 156 157 rtnl_lock(); 158 err = register_netdevice(vport->dev); 159 if (err) 160 goto error_unlock; 161 vport->dev->priv_destructor = internal_dev_destructor; 162 163 dev_set_promiscuity(vport->dev, 1); 164 rtnl_unlock(); 165 netif_start_queue(vport->dev); 166 167 return vport; 168 169 error_unlock: 170 rtnl_unlock(); 171 free_percpu(dev->tstats); 172 error_free_netdev: 173 free_netdev(dev); 174 error_free_vport: 175 ovs_vport_free(vport); 176 error: 177 return ERR_PTR(err); 178 } 179 180 static void internal_dev_destroy(struct vport *vport) 181 { 182 netif_stop_queue(vport->dev); 183 rtnl_lock(); 184 dev_set_promiscuity(vport->dev, -1); 185 186 /* unregister_netdevice() waits for an RCU grace period. */ 187 unregister_netdevice(vport->dev); 188 free_percpu(vport->dev->tstats); 189 rtnl_unlock(); 190 } 191 192 static netdev_tx_t internal_dev_recv(struct sk_buff *skb) 193 { 194 struct net_device *netdev = skb->dev; 195 196 if (unlikely(!(netdev->flags & IFF_UP))) { 197 kfree_skb(skb); 198 netdev->stats.rx_dropped++; 199 return NETDEV_TX_OK; 200 } 201 202 skb_dst_drop(skb); 203 nf_reset_ct(skb); 204 secpath_reset(skb); 205 206 skb->pkt_type = PACKET_HOST; 207 skb->protocol = eth_type_trans(skb, netdev); 208 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 209 dev_sw_netstats_rx_add(netdev, skb->len); 210 211 netif_rx(skb); 212 return NETDEV_TX_OK; 213 } 214 215 static struct vport_ops ovs_internal_vport_ops = { 216 .type = OVS_VPORT_TYPE_INTERNAL, 217 .create = internal_dev_create, 218 .destroy = internal_dev_destroy, 219 .send = internal_dev_recv, 220 }; 221 222 int ovs_is_internal_dev(const struct net_device *netdev) 223 { 224 return netdev->netdev_ops == &internal_dev_netdev_ops; 225 } 226 227 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 228 { 229 if (!ovs_is_internal_dev(netdev)) 230 return NULL; 231 232 return internal_dev_priv(netdev)->vport; 233 } 234 235 int ovs_internal_dev_rtnl_link_register(void) 236 { 237 int err; 238 239 err = rtnl_link_register(&internal_dev_link_ops); 240 if (err < 0) 241 return err; 242 243 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 244 if (err < 0) 245 rtnl_link_unregister(&internal_dev_link_ops); 246 247 return err; 248 } 249 250 void ovs_internal_dev_rtnl_link_unregister(void) 251 { 252 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 253 rtnl_link_unregister(&internal_dev_link_ops); 254 } 255