path: root/drivers/net/ipvlan/ipvlan_main.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
 */

#include <linux/ethtool.h>
#include <net/netdev_lock.h>

#include "ipvlan.h"

static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
				struct netlink_ext_ack *extack)
{
	struct ipvl_dev *ipvlan;
	unsigned int flags;
	int err;

	ASSERT_RTNL();
	if (port->mode != nval) {
		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
			flags = ipvlan->dev->flags;
			if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
				err = dev_change_flags(ipvlan->dev,
						       flags | IFF_NOARP,
						       extack);
			} else {
				err = dev_change_flags(ipvlan->dev,
						       flags & ~IFF_NOARP,
						       extack);
			}
			if (unlikely(err))
				goto fail;
		}
		if (nval == IPVLAN_MODE_L3S) {
			/* New mode is L3S */
			err = ipvlan_l3s_register(port);
			if (err)
				goto fail;
		} else if (port->mode == IPVLAN_MODE_L3S) {
			/* Old mode was L3S */
			ipvlan_l3s_unregister(port);
		}
		port->mode = nval;
	}
	return 0;

fail:
	/* Undo the flags changes that have been done so far. */
	list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
		flags = ipvlan->dev->flags;
		if (port->mode == IPVLAN_MODE_L3 ||
		    port->mode == IPVLAN_MODE_L3S)
			dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
					 NULL);
		else
			dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
					 NULL);
	}

	return err;
}

static int ipvlan_port_create(struct net_device *dev)
{
	struct ipvl_port *port;
	int err, idx;

	port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
	if (!port)
		return -ENOMEM;

	write_pnet(&port->pnet, dev_net(dev));
	port->dev = dev;
	port->mode = IPVLAN_MODE_L3;
	INIT_LIST_HEAD(&port->ipvlans);
	for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
		INIT_HLIST_HEAD(&port->hlhead[idx]);

	spin_lock_init(&port->addrs_lock);
	skb_queue_head_init(&port->backlog);
	INIT_WORK(&port->wq, ipvlan_process_multicast);
	ida_init(&port->ida);
	port->dev_id_start = 1;

	err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
	if (err)
		goto err;

	netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
	return 0;

err:
	kfree(port);
	return err;
}

static void ipvlan_port_destroy(struct net_device *dev)
{
	struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
	struct sk_buff *skb;

	netdev_put(dev, &port->dev_tracker);
	if (port->mode == IPVLAN_MODE_L3S)
		ipvlan_l3s_unregister(port);
	netdev_rx_handler_unregister(dev);
	cancel_work_sync(&port->wq);
	while ((skb =