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         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         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         dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 144
 145         dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
 146         dev->ifindex = parms->desired_ifindex;
 147         internal_dev = internal_dev_priv(vport->dev);
 148         internal_dev->vport = vport;
 149
 150         /* Restrict bridge port to current netns. */
 151         if (vport->port_no == OVSP_LOCAL)
 152                 vport->dev->netns_local = true;
 153
 154         rtnl_lock();
 155         err = register_netdevice(vport->dev);
 156         if (err)
 157                 goto error_unlock;
 158         vport->dev->priv_destructor = internal_dev_destructor;
 159
 160         dev_set_promiscuity(vport->dev, 1);
 161         rtnl_unlock();
 162         netif_start_queue(vport->dev);
 163
 164         return vport;
 165
 166 error_unlock:
 167         rtnl_unlock();
 168         free_netdev(dev);
 169 error_free_vport:
 170         ovs_vport_free(vport);
 171 error:
 172         return ERR_PTR(err);
 173 }
 174
 175 static void internal_dev_destroy(struct vport *vport)
 176 {
 177         netif_stop_queue(vport->dev);
 178         rtnl_lock();
 179         dev_set_promiscuity(vport->dev, -1);
 180
 181         /* unregister_netdevice() waits for an RCU grace period. */
 182         unregister_netdevice(vport->dev);
 183         rtnl_unlock();
 184 }
 185
 186 static int internal_dev_recv(struct sk_buff *skb)
 187 {
 188         struct net_device *netdev = skb->dev;
 189
 190         if (unlikely(!(netdev->flags & IFF_UP))) {
 191                 kfree_skb(skb);
 192                 netdev->stats.rx_dropped++;
 193                 return NETDEV_TX_OK;
 194         }
 195
 196         skb_dst_drop(skb);
 197         nf_reset_ct(skb);
 198         secpath_reset(skb);
 199
 200         skb->pkt_type = PACKET_HOST;
 201         skb->protocol = eth_type_trans(skb, netdev);
 202         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 203         dev_sw_netstats_rx_add(netdev, skb->len);
 204
 205         netif_rx(skb);
 206         return NETDEV_TX_OK;
 207 }
 208
 209 static struct vport_ops ovs_internal_vport_ops = {
 210         .type           = OVS_VPORT_TYPE_INTERNAL,
 211         .create         = internal_dev_create,
 212         .destroy        = internal_dev_destroy,
 213         .send           = internal_dev_recv,
 214 };
 215
 216 int ovs_is_internal_dev(const struct net_device *netdev)
 217 {
 218         return netdev->netdev_ops == &internal_dev_netdev_ops;
 219 }
 220
 221 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 222 {
 223         if (!ovs_is_internal_dev(netdev))
 224                 return NULL;
 225
 226         return internal_dev_priv(netdev)->vport;
 227 }
 228
 229 int ovs_internal_dev_rtnl_link_register(void)
 230 {
 231         int err;
 232
 233         err = rtnl_link_register(&internal_dev_link_ops);
 234         if (err < 0)
 235                 return err;
 236
 237         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
 238         if (err < 0)
 239                 rtnl_link_unregister(&internal_dev_link_ops);
 240
 241         return err;
 242 }
 243
 244 void ovs_internal_dev_rtnl_link_unregister(void)
 245 {
 246         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
 247         rtnl_link_unregister(&internal_dev_link_ops);
 248 }