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 strscpy(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 }; 89 90 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 91 .kind = "openvswitch", 92 }; 93 94 static void do_setup(struct net_device *netdev) 95 { 96 ether_setup(netdev); 97 98 netdev->max_mtu = ETH_MAX_MTU; 99 100 netdev->netdev_ops = &internal_dev_netdev_ops; 101 102 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 103 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | 104 IFF_NO_QUEUE; 105 netdev->lltx = true; 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_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | 112 NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | 113 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; 119 120 netif_set_tso_max_size(netdev, GSO_MAX_SIZE); 121 122 eth_hw_addr_random(netdev); 123 } 124 125 static struct vport *internal_dev_create(const struct vport_parms *parms) 126 { 127 struct vport *vport; 128 struct internal_dev *internal_dev; 129 struct net_device *dev; 130 int err; 131 132 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 133 if (IS_ERR(vport)) { 134 err = PTR_ERR(vport); 135 goto error; 136 } 137 138 dev = alloc_netdev(sizeof(struct internal_dev), 139 parms->name, NET_NAME_USER, do_setup); 140 vport->dev = dev; 141 if (!vport->dev) { 142 err = -ENOMEM; 143 goto error_free_vport; 144 } 145 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 146 147 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 148 dev->ifindex = parms->desired_ifindex; 149 internal_dev = internal_dev_priv(vport->dev); 150 internal_dev->vport = vport; 151 152 /* Restrict bridge port to current netns. */ 153 if (vport->port_no == OVSP_LOCAL) 154 vport->dev->netns_immutable = true; 155 156 rtnl_lock(); 157 err = register_netdevice(vport->dev); 158 if (err) 159 goto error_unlock; 160 vport->dev->priv_destructor = internal_dev_destructor; 161 162 dev_set_promiscuity(vport->dev, 1); 163 rtnl_unlock(); 164 netif_start_queue(vport->dev); 165 166 return vport; 167 168 error_unlock: 169 rtnl_unlock(); 170 free_netdev(dev); 171 error_free_vport: 172 ovs_vport_free(vport); 173 error: 174 return ERR_PTR(err); 175 } 176 177 static void internal_dev_destroy(struct vport *vport) 178 { 179 netif_stop_queue(vport->dev); 180 rtnl_lock(); 181 dev_set_promiscuity(vport->dev, -1); 182 183 /* unregister_netdevice() waits for an RCU grace period. */ 184 unregister_netdevice(vport->dev); 185 rtnl_unlock(); 186 } 187 188 static int internal_dev_recv(struct sk_buff *skb) 189 { 190 struct net_device *netdev = skb->dev; 191 192 if (unlikely(!(netdev->flags & IFF_UP))) { 193 kfree_skb(skb); 194 netdev->stats.rx_dropped++; 195 return NETDEV_TX_OK; 196 } 197 198 skb_dst_drop(skb); 199 nf_reset_ct(skb); 200 201 skb->pkt_type = PACKET_HOST; 202 skb->protocol = eth_type_trans(skb, netdev); 203 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 204 dev_sw_netstats_rx_add(netdev, skb->len); 205 206 netif_rx(skb); 207 return NETDEV_TX_OK; 208 } 209 210 static struct vport_ops ovs_internal_vport_ops = { 211 .type = OVS_VPORT_TYPE_INTERNAL, 212 .create = internal_dev_create, 213 .destroy = internal_dev_destroy, 214 .send = internal_dev_recv, 215 }; 216 217 int ovs_is_internal_dev(const struct net_device *netdev) 218 { 219 return netdev->netdev_ops == &internal_dev_netdev_ops; 220 } 221 222 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 223 { 224 if (!ovs_is_internal_dev(netdev)) 225 return NULL; 226 227 return internal_dev_priv(netdev)->vport; 228 } 229 230 int ovs_internal_dev_rtnl_link_register(void) 231 { 232 int err; 233 234 err = rtnl_link_register(&internal_dev_link_ops); 235 if (err < 0) 236 return err; 237 238 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 239 if (err < 0) 240 rtnl_link_unregister(&internal_dev_link_ops); 241 242 return err; 243 } 244 245 void ovs_internal_dev_rtnl_link_unregister(void) 246 { 247 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 248 rtnl_link_unregister(&internal_dev_link_ops); 249 } 250