path: root/net/batman-adv/soft-interface.c

/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "main.h"
#include "soft-interface.h"
#include "hard-interface.h"
#include "distributed-arp-table.h"
#include "routing.h"
#include "send.h"
#include "debugfs.h"
#include "translation-table.h"
#include "hash.h"
#include "gateway_common.h"
#include "gateway_client.h"
#include "sysfs.h"
#include "originator.h"
#include <linux/slab.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include "bridge_loop_avoidance.h"
#include "network-coding.h"


static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
static void batadv_get_drvinfo(struct net_device *dev,
			       struct ethtool_drvinfo *info);
static u32 batadv_get_msglevel(struct net_device *dev);
static void batadv_set_msglevel(struct net_device *dev, u32 value);
static u32 batadv_get_link(struct net_device *dev);
static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
static void batadv_get_ethtool_stats(struct net_device *dev,
				     struct ethtool_stats *stats, u64 *data);
static int batadv_get_sset_count(struct net_device *dev, int stringset);

static const struct ethtool_ops batadv_ethtool_ops = {
	.get_settings = batadv_get_settings,
	.get_drvinfo = batadv_get_drvinfo,
	.get_msglevel = batadv_get_msglevel,
	.set_msglevel = batadv_set_msglevel,
	.get_link = batadv_get_link,
	.get_strings = batadv_get_strings,
	.get_ethtool_stats = batadv_get_ethtool_stats,
	.get_sset_count = batadv_get_sset_count,
};

int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
{
	int result;

	/* TODO: We must check if we can release all references to non-payload
	 * data using skb_header_release in our skbs to allow skb_cow_header to
	 * work optimally. This means that those skbs are not allowed to read
	 * or write any data which is before the current position of skb->data
	 * after that call and thus allow other skbs with the same data buffer
	 * to write freely in that area.
	 */
	result = skb_cow_head(skb, len);
	if (result < 0)
		return result;

	skb_push(skb, len);
	return 0;
}

static int batadv_interface_open(struct net_device *dev)
{
	netif_start_queue(dev);
	return 0;
}

static int batadv_interface_release(struct net_device *dev)
{
	netif_stop_queue(dev);
	return 0;
}

static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
{
	struct batadv_priv *bat_priv = netdev_priv(dev);
	struct net_device_stats *stats = &bat_priv->stats;

	stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
	stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
	stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
	stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
	stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
	return stats;
}

static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
{
	struct batadv_priv *bat_priv = netdev_priv(dev);
	struct sockaddr *addr = p;
	uint8_t old_addr[ETH_ALEN];

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(old_addr, dev->dev_addr, ETH_ALEN);
	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);

	/* only modify transtable if it has been initialized before */
	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
		batadv_tt_local_remove(bat_priv, old_addr, BATADV_NO_FLAGS,
				       "mac address changed", false);
		batadv_tt_local_add(dev, addr->sa_data, BATADV_NO_FLAGS,
				    BATADV_NULL_IFINDEX);
	}

	return 0;
}

static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
{
	/* check ranges */
	if ((new_mtu < 68) || (new_mtu >