net/openvswitch/vport-internal_dev.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2007-2012 Nicira, Inc.
0004  */
0005
0006 #include <linux/if_vlan.h>
0007 #include <linux/kernel.h>
0008 #include <linux/netdevice.h>
0009 #include <linux/etherdevice.h>
0010 #include <linux/ethtool.h>
0011 #include <linux/skbuff.h>
0012
0013 #include <net/dst.h>
0014 #include <net/xfrm.h>
0015 #include <net/rtnetlink.h>
0016
0017 #include "datapath.h"
0018 #include "vport-internal_dev.h"
0019 #include "vport-netdev.h"
0020
0021 struct internal_dev {
0022     struct vport *vport;
0023 };
0024
0025 static struct vport_ops ovs_internal_vport_ops;
0026
0027 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
0028 {
0029     return netdev_priv(netdev);
0030 }
0031
0032 /* Called with rcu_read_lock_bh. */
0033 static netdev_tx_t
0034 internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
0035 {
0036     int len, err;
0037
0038     /* store len value because skb can be freed inside ovs_vport_receive() */
0039     len = skb->len;
0040
0041     rcu_read_lock();
0042     err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
0043     rcu_read_unlock();
0044
0045     if (likely(!err))
0046         dev_sw_netstats_tx_add(netdev, 1, len);
0047     else
0048         netdev->stats.tx_errors++;
0049
0050     return NETDEV_TX_OK;
0051 }
0052
0053 static int internal_dev_open(struct net_device *netdev)
0054 {
0055     netif_start_queue(netdev);
0056     return 0;
0057 }
0058
0059 static int internal_dev_stop(struct net_device *netdev)
0060 {
0061     netif_stop_queue(netdev);
0062     return 0;
0063 }
0064
0065 static void internal_dev_getinfo(struct net_device *netdev,
0066                  struct ethtool_drvinfo *info)
0067 {
0068     strlcpy(info->driver, "openvswitch", sizeof(info->driver));
0069 }
0070
0071 static const struct ethtool_ops internal_dev_ethtool_ops = {
0072     .get_drvinfo    = internal_dev_getinfo,
0073     .get_link   = ethtool_op_get_link,
0074 };
0075
0076 static void internal_dev_destructor(struct net_device *dev)
0077 {
0078     struct vport *vport = ovs_internal_dev_get_vport(dev);
0079
0080     ovs_vport_free(vport);
0081 }
0082
0083 static const struct net_device_ops internal_dev_netdev_ops = {
0084     .ndo_open = internal_dev_open,
0085     .ndo_stop = internal_dev_stop,
0086     .ndo_start_xmit = internal_dev_xmit,
0087     .ndo_set_mac_address = eth_mac_addr,
0088     .ndo_get_stats64 = dev_get_tstats64,
0089 };
0090
0091 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
0092     .kind = "openvswitch",
0093 };
0094
0095 static void do_setup(struct net_device *netdev)
0096 {
0097     ether_setup(netdev);
0098
0099     netdev->max_mtu = ETH_MAX_MTU;
0100
0101     netdev->netdev_ops = &internal_dev_netdev_ops;
0102
0103     netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
0104     netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
0105                   IFF_NO_QUEUE;
0106     netdev->needs_free_netdev = true;
0107     netdev->priv_destructor = NULL;
0108     netdev->ethtool_ops = &internal_dev_ethtool_ops;
0109     netdev->rtnl_link_ops = &internal_dev_link_ops;
0110
0111     netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
0112                NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
0113                NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
0114
0115     netdev->vlan_features = netdev->features;
0116     netdev->hw_enc_features = netdev->features;
0117     netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0118     netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
0119
0120     eth_hw_addr_random(netdev);
0121 }
0122
0123 static struct vport *internal_dev_create(const struct vport_parms *parms)
0124 {
0125     struct vport *vport;
0126     struct internal_dev *internal_dev;
0127     struct net_device *dev;
0128     int err;
0129
0130     vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
0131     if (IS_ERR(vport)) {
0132         err = PTR_ERR(vport);
0133         goto error;
0134     }
0135
0136     dev = alloc_netdev(sizeof(struct internal_dev),
0137                parms->name, NET_NAME_USER, do_setup);
0138     vport->dev = dev;
0139     if (!vport->dev) {
0140         err = -ENOMEM;
0141         goto error_free_vport;
0142     }
0143     vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
0144     if (!vport->dev->tstats) {
0145         err = -ENOMEM;
0146         goto error_free_netdev;
0147     }
0148
0149     dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
0150     internal_dev = internal_dev_priv(vport->dev);
0151     internal_dev->vport = vport;
0152
0153     /* Restrict bridge port to current netns. */
0154     if (vport->port_no == OVSP_LOCAL)
0155         vport->dev->features |= NETIF_F_NETNS_LOCAL;
0156
0157     rtnl_lock();
0158     err = register_netdevice(vport->dev);
0159     if (err)
0160         goto error_unlock;
0161     vport->dev->priv_destructor = internal_dev_destructor;
0162
0163     dev_set_promiscuity(vport->dev, 1);
0164     rtnl_unlock();
0165     netif_start_queue(vport->dev);
0166
0167     return vport;
0168
0169 error_unlock:
0170     rtnl_unlock();
0171     free_percpu(dev->tstats);
0172 error_free_netdev:
0173     free_netdev(dev);
0174 error_free_vport:
0175     ovs_vport_free(vport);
0176 error:
0177     return ERR_PTR(err);
0178 }
0179
0180 static void internal_dev_destroy(struct vport *vport)
0181 {
0182     netif_stop_queue(vport->dev);
0183     rtnl_lock();
0184     dev_set_promiscuity(vport->dev, -1);
0185
0186     /* unregister_netdevice() waits for an RCU grace period. */
0187     unregister_netdevice(vport->dev);
0188     free_percpu(vport->dev->tstats);
0189     rtnl_unlock();
0190 }
0191
0192 static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
0193 {
0194     struct net_device *netdev = skb->dev;
0195
0196     if (unlikely(!(netdev->flags & IFF_UP))) {
0197         kfree_skb(skb);
0198         netdev->stats.rx_dropped++;
0199         return NETDEV_TX_OK;
0200     }
0201
0202     skb_dst_drop(skb);
0203     nf_reset_ct(skb);
0204     secpath_reset(skb);
0205
0206     skb->pkt_type = PACKET_HOST;
0207     skb->protocol = eth_type_trans(skb, netdev);
0208     skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
0209     dev_sw_netstats_rx_add(netdev, skb->len);
0210
0211     netif_rx(skb);
0212     return NETDEV_TX_OK;
0213 }
0214
0215 static struct vport_ops ovs_internal_vport_ops = {
0216     .type       = OVS_VPORT_TYPE_INTERNAL,
0217     .create     = internal_dev_create,
0218     .destroy    = internal_dev_destroy,
0219     .send       = internal_dev_recv,
0220 };
0221
0222 int ovs_is_internal_dev(const struct net_device *netdev)
0223 {
0224     return netdev->netdev_ops == &internal_dev_netdev_ops;
0225 }
0226
0227 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
0228 {
0229     if (!ovs_is_internal_dev(netdev))
0230         return NULL;
0231
0232     return internal_dev_priv(netdev)->vport;
0233 }
0234
0235 int ovs_internal_dev_rtnl_link_register(void)
0236 {
0237     int err;
0238
0239     err = rtnl_link_register(&internal_dev_link_ops);
0240     if (err < 0)
0241         return err;
0242
0243     err = ovs_vport_ops_register(&ovs_internal_vport_ops);
0244     if (err < 0)
0245         rtnl_link_unregister(&internal_dev_link_ops);
0246
0247     return err;
0248 }
0249
0250 void ovs_internal_dev_rtnl_link_unregister(void)
0251 {
0252     ovs_vport_ops_unregister(&ovs_internal_vport_ops);
0253     rtnl_link_unregister(&internal_dev_link_ops);
0254 }