net/openvswitch/vport-netdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2012 Nicira, Inc.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/if_arp.h>
   9 #include <linux/if_bridge.h>
  10 #include <linux/if_vlan.h>
  11 #include <linux/kernel.h>
  12 #include <linux/llc.h>
  13 #include <linux/rtnetlink.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/openvswitch.h>
  16 #include <linux/export.h>
  17
  18 #include <net/ip_tunnels.h>
  19 #include <net/rtnetlink.h>
  20
  21 #include "datapath.h"
  22 #include "vport.h"
  23 #include "vport-internal_dev.h"
  24 #include "vport-netdev.h"
  25
  26 static struct vport_ops ovs_netdev_vport_ops;
  27
  28 /* Must be called with rcu_read_lock. */
  29 static void netdev_port_receive(struct sk_buff *skb)
  30 {
  31         struct vport *vport;
  32
  33         vport = ovs_netdev_get_vport(skb->dev);
  34         if (unlikely(!vport))
  35                 goto error;
  36
  37         if (unlikely(skb_warn_if_lro(skb)))
  38                 goto error;
  39
  40         /* Make our own copy of the packet.  Otherwise we will mangle the
  41          * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
  42          */
  43         skb = skb_share_check(skb, GFP_ATOMIC);
  44         if (unlikely(!skb))
  45                 return;
  46
  47         if (skb->dev->type == ARPHRD_ETHER)
  48                 skb_push_rcsum(skb, ETH_HLEN);
  49
  50         ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
  51         return;
  52 error:
  53         kfree_skb(skb);
  54 }
  55
  56 /* Called with rcu_read_lock and bottom-halves disabled. */
  57 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
  58 {
  59         struct sk_buff *skb = *pskb;
  60
  61         if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
  62                 return RX_HANDLER_PASS;
  63
  64         netdev_port_receive(skb);
  65         return RX_HANDLER_CONSUMED;
  66 }
  67
  68 static struct net_device *get_dpdev(const struct datapath *dp)
  69 {
  70         struct vport *local;
  71
  72         local = ovs_vport_ovsl(dp, OVSP_LOCAL);
  73         return local->dev;
  74 }
  75
  76 struct vport *ovs_netdev_link(struct vport *vport, const char *name)
  77 {
  78         int err;
  79
  80         vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
  81         if (!vport->dev) {
  82                 err = -ENODEV;
  83                 goto error_free_vport;
  84         }
  85         /* Ensure that the device exists and that the provided
  86          * name is not one of its aliases.
  87          */
  88         if (strcmp(name, ovs_vport_name(vport))) {
  89                 err = -ENODEV;
  90                 goto error_put;
  91         }
  92         netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL);
  93         if (vport->dev->flags & IFF_LOOPBACK ||
  94             (vport->dev->type != ARPHRD_ETHER &&
  95              vport->dev->type != ARPHRD_NONE) ||
  96             ovs_is_internal_dev(vport->dev)) {
  97                 err = -EINVAL;
  98                 goto error_put;
  99         }
 100
 101         rtnl_lock();
 102         err = netdev_master_upper_dev_link(vport->dev,
 103                                            get_dpdev(vport->dp),
 104                                            NULL, NULL, NULL);
 105         if (err)
 106                 goto error_unlock;
 107
 108         err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
 109                                          vport);
 110         if (err)
 111                 goto error_master_upper_dev_unlink;
 112
 113         dev_disable_lro(vport->dev);
 114         dev_set_promiscuity(vport->dev, 1);
 115         vport->dev->priv_flags |= IFF_OVS_DATAPATH;
 116         rtnl_unlock();
 117
 118         return vport;
 119
 120 error_master_upper_dev_unlink:
 121         netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
 122 error_unlock:
 123         rtnl_unlock();
 124 error_put:
 125         netdev_put(vport->dev, &vport->dev_tracker);
 126 error_free_vport:
 127         ovs_vport_free(vport);
 128         return ERR_PTR(err);
 129 }
 130 EXPORT_SYMBOL_GPL(ovs_netdev_link);
 131
 132 static struct vport *netdev_create(const struct vport_parms *parms)
 133 {
 134         struct vport *vport;
 135
 136         vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
 137         if (IS_ERR(vport))
 138                 return vport;
 139
 140         return ovs_netdev_link(vport, parms->name);
 141 }
 142
 143 static void vport_netdev_free(struct rcu_head *rcu)
 144 {
 145         struct vport *vport = container_of(rcu, struct vport, rcu);
 146
 147         netdev_put(vport->dev, &vport->dev_tracker);
 148         ovs_vport_free(vport);
 149 }
 150
 151 void ovs_netdev_detach_dev(struct vport *vport)
 152 {
 153         ASSERT_RTNL();
 154         vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
 155         netdev_rx_handler_unregister(vport->dev);
 156         netdev_upper_dev_unlink(vport->dev,
 157                                 netdev_master_upper_dev_get(vport->dev));
 158         dev_set_promiscuity(vport->dev, -1);
 159 }
 160
 161 static void netdev_destroy(struct vport *vport)
 162 {
 163         rtnl_lock();
 164         if (netif_is_ovs_port(vport->dev))
 165                 ovs_netdev_detach_dev(vport);
 166         rtnl_unlock();
 167
 168         call_rcu(&vport->rcu, vport_netdev_free);
 169 }
 170
 171 void ovs_netdev_tunnel_destroy(struct vport *vport)
 172 {
 173         rtnl_lock();
 174         if (netif_is_ovs_port(vport->dev))
 175                 ovs_netdev_detach_dev(vport);
 176
 177         /* We can be invoked by both explicit vport deletion and
 178          * underlying netdev deregistration; delete the link only
 179          * if it's not already shutting down.
 180          */
 181         if (vport->dev->reg_state == NETREG_REGISTERED)
 182                 rtnl_delete_link(vport->dev, 0, NULL);
 183         netdev_put(vport->dev, &vport->dev_tracker);
 184         vport->dev = NULL;
 185         rtnl_unlock();
 186
 187         call_rcu(&vport->rcu, vport_netdev_free);
 188 }
 189 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
 190
 191 /* Returns null if this device is not attached to a datapath. */
 192 struct vport *ovs_netdev_get_vport(struct net_device *dev)
 193 {
 194         if (likely(netif_is_ovs_port(dev)))
 195                 return (struct vport *)
 196                         rcu_dereference_rtnl(dev->rx_handler_data);
 197         else
 198                 return NULL;
 199 }
 200
 201 static struct vport_ops ovs_netdev_vport_ops = {
 202         .type           = OVS_VPORT_TYPE_NETDEV,
 203         .create         = netdev_create,
 204         .destroy        = netdev_destroy,
 205         .send           = dev_queue_xmit,
 206 };
 207
 208 int __init ovs_netdev_init(void)
 209 {
 210         return ovs_vport_ops_register(&ovs_netdev_vport_ops);
 211 }
 212
 213 void ovs_netdev_exit(void)
 214 {
 215         ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
 216 }