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->needs_free_netdev = true; 106 netdev->priv_destructor = NULL; 107 netdev->ethtool_ops = &internal_dev_ethtool_ops; 108 netdev->rtnl_link_ops = &internal_dev_link_ops; 109 110 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 111 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 112 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 113 114 netdev->vlan_features = netdev->features; 115 netdev->hw_enc_features = netdev->features; 116 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 117 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 118 119 eth_hw_addr_random(netdev); 120 } 121 122 static struct vport *internal_dev_create(const struct vport_parms *parms) 123 { 124 struct vport *vport; 125 struct internal_dev *internal_dev; 126 struct net_device *dev; 127 int err; 128 129 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 130 if (IS_ERR(vport)) { 131 err = PTR_ERR(vport); 132 goto error; 133 } 134 135 dev = alloc_netdev(sizeof(struct internal_dev), 136 parms->name, NET_NAME_USER, do_setup); 137 vport->dev = dev; 138 if (!vport->dev) { 139 err = -ENOMEM; 140 goto error_free_vport; 141 } 142 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 143 144 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 145 dev->ifindex = parms->desired_ifindex; 146 internal_dev = internal_dev_priv(vport->dev); 147 internal_dev->vport = vport; 148 149 /* Restrict bridge port to current netns. */ 150 if (vport->port_no == OVSP_LOCAL) 151 vport->dev->features |= NETIF_F_NETNS_LOCAL; 152 153 rtnl_lock(); 154 err = register_netdevice(vport->dev); 155 if (err) 156 goto error_unlock; 157 vport->dev->priv_destructor = internal_dev_destructor; 158 159 dev_set_promiscuity(vport->dev, 1); 160 rtnl_unlock(); 161 netif_start_queue(vport->dev); 162 163 return vport; 164 165 error_unlock: 166 rtnl_unlock(); 167 free_netdev(dev); 168 error_free_vport: 169 ovs_vport_free(vport); 170 error: 171 return ERR_PTR(err); 172 } 173 174 static void internal_dev_destroy(struct vport *vport) 175 { 176 netif_stop_queue(vport->dev); 177 rtnl_lock(); 178 dev_set_promiscuity(vport->dev, -1); 179 180 /* unregister_netdevice() waits for an RCU grace period. */ 181 unregister_netdevice(vport->dev); 182 rtnl_unlock(); 183 } 184 185 static int internal_dev_recv(struct sk_buff *skb) 186 { 187 struct net_device *netdev = skb->dev; 188 189 if (unlikely(!(netdev->flags & IFF_UP))) { 190 kfree_skb(skb); 191 netdev->stats.rx_dropped++; 192 return NETDEV_TX_OK; 193 } 194 195 skb_dst_drop(skb); 196 nf_reset_ct(skb); 197 secpath_reset(skb); 198 199 skb->pkt_type = PACKET_HOST; 200 skb->protocol = eth_type_trans(skb, netdev); 201 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 202 dev_sw_netstats_rx_add(netdev, skb->len); 203 204 netif_rx(skb); 205 return NETDEV_TX_OK; 206 } 207 208 static struct vport_ops ovs_internal_vport_ops = { 209 .type = OVS_VPORT_TYPE_INTERNAL, 210 .create = internal_dev_create, 211 .destroy = internal_dev_destroy, 212 .send = internal_dev_recv, 213 }; 214 215 int ovs_is_internal_dev(const struct net_device *netdev) 216 { 217 return netdev->netdev_ops == &internal_dev_netdev_ops; 218 } 219 220 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 221 { 222 if (!ovs_is_internal_dev(netdev)) 223 return NULL; 224 225 return internal_dev_priv(netdev)->vport; 226 } 227 228 int ovs_internal_dev_rtnl_link_register(void) 229 { 230 int err; 231 232 err = rtnl_link_register(&internal_dev_link_ops); 233 if (err < 0) 234 return err; 235 236 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 237 if (err < 0) 238 rtnl_link_unregister(&internal_dev_link_ops); 239 240 return err; 241 } 242 243 void ovs_internal_dev_rtnl_link_unregister(void) 244 { 245 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 246 rtnl_link_unregister(&internal_dev_link_ops); 247 } 248