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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2007-2012 Nicira, Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/if_arp.h>
#include <linux/if_bridge.h>
#include <linux/if_vlan.h>
#include <linux/kernel.h>
#include <linux/llc.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/openvswitch.h>
#include <linux/export.h>
#include <net/ip_tunnels.h>
#include <net/rtnetlink.h>
#include "datapath.h"
#include "vport.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"
static struct vport_ops ovs_netdev_vport_ops;
/* Must be called with rcu_read_lock. */
static void netdev_port_receive(struct sk_buff *skb)
{
struct vport *vport;
vport = ovs_netdev_get_vport(skb->dev);
if (unlikely(!vport))
goto error;
if (unlikely(skb_warn_if_lro(skb)))
goto error;
/* Make our own copy of the packet. Otherwise we will mangle the
* packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
*/
skb = skb_share_check(skb, GFP_ATOMIC);
if (unlikely(!skb))
return;
if (skb->dev->type == ARPHRD_ETHER)
skb_push_rcsum(skb, ETH_HLEN);
ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
return;
error:
kfree_skb(skb);
}
/* Called with rcu_read_lock and bottom-halves disabled. */
static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
return RX_HANDLER_PASS;
netdev_port_receive(skb);
return RX_HANDLER_CONSUMED;
}
static struct net_device *get_dpdev(const struct datapath *dp)
{
struct vport *local;
local = ovs_vport_ovsl(dp, OVSP_LOCAL);
return local->dev;
}
struct vport *ovs_netdev_link(struct vport *vport, const char *name)
{
int err;
vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
/* Ensure that the device exists and that the provided
* name is not one of its aliases.
*/
if (!vport->dev || strcmp(name, ovs_vport_name(vport))) {
err = -ENODEV;
goto error_free_vport;
}
netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL);
if (vport->dev->flags & IFF_LOOPBACK ||
(vport->dev->type != ARPHRD_ETHER &&
vport->dev->type != ARPHRD_NONE) ||
ovs_is_internal_dev(vport->dev)) {
err = -EINVAL;
goto error_put;
}
rtnl_lock();
err = netdev_master_upper_dev_link(vport->dev,
get_dpdev(vport->dp),
NULL, NULL, NULL);
if (err)
goto error_unlock;
err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
vport);
if (err)
goto error_master_upper_dev_unlink;
dev_disable_lro(vport->dev);
dev_set_promiscuity(vport->dev, 1);
vport->dev->priv_flags |= IFF_OVS_DATAPATH;
rtnl_unlock();
return vport;
error_master_upper_dev_unlink:
netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
error_unlock:
rtnl_unlock();
error_put:
netdev_put(vport->dev, &vport->dev_tracker);
error_free_vport:
ovs_vport_free(vport);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(ovs_netdev_link);
static struct vport *netdev_create(const struct vport_parms *parms)
{
struct vport *vport;
vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
if (IS_ERR(vport))
return vport;
return ovs_netdev_link(vport, parms->name);
}
static void vport_netdev_free(struct rcu_head *rcu)
{
struct vport *vport = container_of(rcu, struct vport, rcu);
netdev_put(vport->dev, &vport->dev_tracker);
ovs_vport_free(vport);
}
void ovs_netdev_detach_dev(struct vport *vport)
{
ASSERT_RTNL();
vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
netdev_rx_handler_unregister(vport->dev);
netdev_upper_dev_unlink(vport->dev,
netdev_master_upper_dev_get(vport->dev));
dev_set_promiscuity(vport->dev, -1);
}
static void netdev_destroy(struct vport *vport)
{
rtnl_lock();
if (netif_is_ovs_port(vport->dev))
ovs_netdev_detach_dev(vport);
rtnl_unlock();
call_rcu(&vport->rcu, vport_netdev_free);
}
void ovs_netdev_tunnel_destroy(struct vport *vport)
{
rtnl_lock();
if (netif_is_ovs_port(vport->dev))
ovs_netdev_detach_dev(vport);
/* We can be invoked by both explicit vport deletion and
* underlying netdev deregistration; delete the link only
* if it's not already shutting down.
*/
if (vport->dev->reg_state == NETREG_REGISTERED)
rtnl_delete_link(vport->dev, 0, NULL);
netdev_put(vport->dev, &vport->dev_tracker);
vport->dev = NULL;
rtnl_unlock();
call_rcu(&vport->rcu, vport_netdev_free);
}
EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
/* Returns null if this device is not attached to a datapath. */
struct vport *ovs_netdev_get_vport(struct net_device *dev)
{
if (likely(netif_is_ovs_port(dev)))
return (struct vport *)
rcu_dereference_rtnl(dev->rx_handler_data);
else
return NULL;
}
static struct vport_ops ovs_netdev_vport_ops = {
.type = OVS_VPORT_TYPE_NETDEV,
.create = netdev_create,
.destroy = netdev_destroy,
.send = dev_queue_xmit,
};
int __init ovs_netdev_init(void)
{
return ovs_vport_ops_register(&ovs_netdev_vport_ops);
}
void ovs_netdev_exit(void)
{
ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
}
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