net/openvswitch/vport-internal_dev.c

   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 }