[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / batman-adv / soft-interface.c

/* Copyright (C) 2007-2012 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#include "main.h"
#include "soft-interface.h"
#include "hard-interface.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 "unicast.h"
#include "bridge_loop_avoidance.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,
				       "mac address changed", false);
		batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
	}

	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
	return 0;
}

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

	dev->mtu = new_mtu;

	return 0;
}

static int batadv_interface_tx(struct sk_buff *skb,
			       struct net_device *soft_iface)
{
	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	struct batadv_hard_iface *primary_if = NULL;
	struct batadv_bcast_packet *bcast_packet;
	struct vlan_ethhdr *vhdr;
	__be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
	static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
						   0x00};
	unsigned int header_len = 0;
	int data_len = skb->len, ret;
	short vid __maybe_unused = -1;
	bool do_bcast = false;
	uint32_t seqno;

	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
		goto dropped;

	soft_iface->trans_start = jiffies;

	switch (ntohs(ethhdr->h_proto)) {
	case ETH_P_8021Q:
		vhdr = (struct vlan_ethhdr *)skb->data;
		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;

		if (vhdr->h_vlan_encapsulated_proto != ethertype)
			break;

		/* fall through */
	case BATADV_ETH_P_BATMAN:
		goto dropped;
	}

	if (batadv_bla_tx(bat_priv, skb, vid))
		goto dropped;

	/* Register the client MAC in the transtable */
	batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);

	/* don't accept stp packets. STP does not help in meshes.
	 * better use the bridge loop avoidance ...
	 */
	if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
		goto dropped;

	if (is_multicast_ether_addr(ethhdr->h_dest)) {
		do_bcast = true;

		switch (atomic_read(&bat_priv->gw_mode)) {
		case BATADV_GW_MODE_SERVER:
			/* gateway servers should not send dhcp
			 * requests into the mesh
			 */
			ret = batadv_gw_is_dhcp_target(skb, &header_len);
			if (ret)
				goto dropped;
			break;
		case BATADV_GW_MODE_CLIENT:
			/* gateway clients should send dhcp requests
			 * via unicast to their gateway
			 */
			ret = batadv_gw_is_dhcp_target(skb, &header_len);
			if (ret)
				do_bcast = false;
			break;
		case BATADV_GW_MODE_OFF:
		default:
			break;
		}
	}

	/* ethernet packet should be broadcasted */
	if (do_bcast) {
		primary_if = batadv_primary_if_get_selected(bat_priv);
		if (!primary_if)
			goto dropped;

		if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
			goto dropped;

		bcast_packet = (struct batadv_bcast_packet *)skb->data;
		bcast_packet->header.version = BATADV_COMPAT_VERSION;
		bcast_packet->header.ttl = BATADV_TTL;

		/* batman packet type: broadcast */
		bcast_packet->header.packet_type = BATADV_BCAST;
		bcast_packet->reserved = 0;

		/* hw address of first interface is the orig mac because only
		 * this mac is known throughout the mesh
		 */
		memcpy(bcast_packet->orig,
		       primary_if->net_dev->dev_addr, ETH_ALEN);

		/* set broadcast sequence number */
		seqno = atomic_inc_return(&bat_priv->bcast_seqno);
		bcast_packet->seqno = htonl(seqno);

		batadv_add_bcast_packet_to_list(bat_priv, skb, 1);

		/* a copy is stored in the bcast list, therefore removing
		 * the original skb.
		 */
		kfree_skb(skb);

	/* unicast packet */
	} else {
		if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
			ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
			if (ret)
				goto dropped;
		}

		ret = batadv_unicast_send_skb(skb, bat_priv);
		if (ret != 0)
			goto dropped_freed;
	}

	batadv_inc_counter(bat_priv, BATADV_CNT_TX);
	batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
	goto end;

dropped:
	kfree_skb(skb);
dropped_freed:
	batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
end:
	if (primary_if)
		batadv_hardif_free_ref(primary_if);
	return NETDEV_TX_OK;
}

void batadv_interface_rx(struct net_device *soft_iface,
			 struct sk_buff *skb, struct batadv_hard_iface *recv_if,
			 int hdr_size, struct batadv_orig_node *orig_node)
{
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	struct ethhdr *ethhdr;
	struct vlan_ethhdr *vhdr;
	struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
	short vid __maybe_unused = -1;
	__be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
	bool is_bcast;

	is_bcast = (batadv_header->packet_type == BATADV_BCAST);

	/* check if enough space is available for pulling, and pull */
	if (!pskb_may_pull(skb, hdr_size))
		goto dropped;

	skb_pull_rcsum(skb, hdr_size);
	skb_reset_mac_header(skb);

	ethhdr = (struct ethhdr *)skb_mac_header(skb);

	switch (ntohs(ethhdr->h_proto)) {
	case ETH_P_8021Q:
		vhdr = (struct vlan_ethhdr *)skb->data;
		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;

		if (vhdr->h_vlan_encapsulated_proto != ethertype)
			break;

		/* fall through */
	case BATADV_ETH_P_BATMAN:
		goto dropped;
	}

	/* skb->dev & skb->pkt_type are set here */
	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
		goto dropped;
	skb->protocol = eth_type_trans(skb, soft_iface);

	/* should not be necessary anymore as we use skb_pull_rcsum()
	 * TODO: please verify this and remove this TODO
	 * -- Dec 21st 2009, Simon Wunderlich
	 */

	/* skb->ip_summed = CHECKSUM_UNNECESSARY; */

	batadv_inc_counter(bat_priv, BATADV_CNT_RX);
	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
			   skb->len + ETH_HLEN);

	soft_iface->last_rx = jiffies;

	if (orig_node)
		batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
						     ethhdr->h_source);

	if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
		goto dropped;

	/* Let the bridge loop avoidance check the packet. If will
	 * not handle it, we can safely push it up.
	 */
	if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
		goto out;

	netif_rx(skb);
	goto out;

dropped:
	kfree_skb(skb);
out:
	return;
}

static const struct net_device_ops batadv_netdev_ops = {
	.ndo_open = batadv_interface_open,
	.ndo_stop = batadv_interface_release,
	.ndo_get_stats = batadv_interface_stats,
	.ndo_set_mac_address = batadv_interface_set_mac_addr,
	.ndo_change_mtu = batadv_interface_change_mtu,
	.ndo_start_xmit = batadv_interface_tx,
	.ndo_validate_addr = eth_validate_addr
};

static void batadv_interface_setup(struct net_device *dev)
{
	struct batadv_priv *priv = netdev_priv(dev);

	ether_setup(dev);

	dev->netdev_ops = &batadv_netdev_ops;
	dev->destructor = free_netdev;
	dev->tx_queue_len = 0;

	/* can't call min_mtu, because the needed variables
	 * have not been initialized yet
	 */
	dev->mtu = ETH_DATA_LEN;
	/* reserve more space in the skbuff for our header */
	dev->hard_header_len = BATADV_HEADER_LEN;

	/* generate random address */
	eth_hw_addr_random(dev);

	SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);

	memset(priv, 0, sizeof(*priv));
}

struct net_device *batadv_softif_create(const char *name)
{
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;
	int ret;
	size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;

	soft_iface = alloc_netdev(sizeof(*bat_priv), name,
				  batadv_interface_setup);

	if (!soft_iface)
		goto out;

	bat_priv = netdev_priv(soft_iface);

	/* batadv_interface_stats() needs to be available as soon as
	 * register_netdevice() has been called
	 */
	bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
	if (!bat_priv->bat_counters)
		goto free_soft_iface;

	ret = register_netdevice(soft_iface);
	if (ret < 0) {
		pr_err("Unable to register the batman interface '%s': %i\n",
		       name, ret);
		goto free_bat_counters;
	}

	atomic_set(&bat_priv->aggregated_ogms, 1);
	atomic_set(&bat_priv->bonding, 0);
	atomic_set(&bat_priv->bridge_loop_avoidance, 0);
	atomic_set(&bat_priv->ap_isolation, 0);
	atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
	atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
	atomic_set(&bat_priv->gw_sel_class, 20);
	atomic_set(&bat_priv->gw_bandwidth, 41);
	atomic_set(&bat_priv->orig_interval, 1000);
	atomic_set(&bat_priv->hop_penalty, 30);
	atomic_set(&bat_priv->log_level, 0);
	atomic_set(&bat_priv->fragmentation, 1);
	atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
	atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);

	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
	atomic_set(&bat_priv->bcast_seqno, 1);
	atomic_set(&bat_priv->tt.vn, 0);
	atomic_set(&bat_priv->tt.local_changes, 0);
	atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
#ifdef CONFIG_BATMAN_ADV_BLA
	atomic_set(&bat_priv->bla.num_requests, 0);
#endif
	bat_priv->tt.last_changeset = NULL;
	bat_priv->tt.last_changeset_len = 0;
	bat_priv->tt.poss_change = false;

	bat_priv->primary_if = NULL;
	bat_priv->num_ifaces = 0;

	ret = batadv_algo_select(bat_priv, batadv_routing_algo);
	if (ret < 0)
		goto unreg_soft_iface;

	ret = batadv_sysfs_add_meshif(soft_iface);
	if (ret < 0)
		goto unreg_soft_iface;

	ret = batadv_debugfs_add_meshif(soft_iface);
	if (ret < 0)
		goto unreg_sysfs;

	ret = batadv_mesh_init(soft_iface);
	if (ret < 0)
		goto unreg_debugfs;

	return soft_iface;

unreg_debugfs:
	batadv_debugfs_del_meshif(soft_iface);
unreg_sysfs:
	batadv_sysfs_del_meshif(soft_iface);
unreg_soft_iface:
	free_percpu(bat_priv->bat_counters);
	unregister_netdevice(soft_iface);
	return NULL;

free_bat_counters:
	free_percpu(bat_priv->bat_counters);
free_soft_iface:
	free_netdev(soft_iface);
out:
	return NULL;
}

void batadv_softif_destroy(struct net_device *soft_iface)
{
	batadv_debugfs_del_meshif(soft_iface);
	batadv_sysfs_del_meshif(soft_iface);
	batadv_mesh_free(soft_iface);
	unregister_netdevice(soft_iface);
}

int batadv_softif_is_valid(const struct net_device *net_dev)
{
	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
		return 1;

	return 0;
}

/* ethtool */
static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	cmd->supported = 0;
	cmd->advertising = 0;
	ethtool_cmd_speed_set(cmd, SPEED_10);
	cmd->duplex = DUPLEX_FULL;
	cmd->port = PORT_TP;
	cmd->phy_address = 0;
	cmd->transceiver = XCVR_INTERNAL;
	cmd->autoneg = AUTONEG_DISABLE;
	cmd->maxtxpkt = 0;
	cmd->maxrxpkt = 0;

	return 0;
}

static void batadv_get_drvinfo(struct net_device *dev,
			       struct ethtool_drvinfo *info)
{
	strcpy(info->driver, "B.A.T.M.A.N. advanced");
	strcpy(info->version, BATADV_SOURCE_VERSION);
	strcpy(info->fw_version, "N/A");
	strcpy(info->bus_info, "batman");
}

static u32 batadv_get_msglevel(struct net_device *dev)
{
	return -EOPNOTSUPP;
}

static void batadv_set_msglevel(struct net_device *dev, u32 value)
{
}

static u32 batadv_get_link(struct net_device *dev)
{
	return 1;
}

/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 * Declare each description string in struct.name[] to get fixed sized buffer
 * and compile time checking for strings longer than ETH_GSTRING_LEN.
 */
static const struct {
	const char name[ETH_GSTRING_LEN];
} batadv_counters_strings[] = {
	{ "tx" },
	{ "tx_bytes" },
	{ "tx_dropped" },
	{ "rx" },
	{ "rx_bytes" },
	{ "forward" },
	{ "forward_bytes" },
	{ "mgmt_tx" },
	{ "mgmt_tx_bytes" },
	{ "mgmt_rx" },
	{ "mgmt_rx_bytes" },
	{ "tt_request_tx" },
	{ "tt_request_rx" },
	{ "tt_response_tx" },
	{ "tt_response_rx" },
	{ "tt_roam_adv_tx" },
	{ "tt_roam_adv_rx" },
};

static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
			       uint8_t *data)
{
	if (stringset == ETH_SS_STATS)
		memcpy(data, batadv_counters_strings,
		       sizeof(batadv_counters_strings));
}

static void batadv_get_ethtool_stats(struct net_device *dev,
				     struct ethtool_stats *stats,
				     uint64_t *data)
{
	struct batadv_priv *bat_priv = netdev_priv(dev);
	int i;

	for (i = 0; i < BATADV_CNT_NUM; i++)
		data[i] = batadv_sum_counter(bat_priv, i);
}

static int batadv_get_sset_count(struct net_device *dev, int stringset)
{
	if (stringset == ETH_SS_STATS)
		return BATADV_CNT_NUM;

	return -EOPNOTSUPP;
}
Commit	Line	Data
9cfc7bd6	1	/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
c6c8fea2 SE	2	*
	3	* Marek Lindner, Simon Wunderlich
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of version 2 of the GNU General Public
	7	* License as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	17	* 02110-1301, USA
c6c8fea2 SE	18	*/
	19
	20	#include "main.h"
	21	#include "soft-interface.h"
	22	#include "hard-interface.h"
	23	#include "routing.h"
	24	#include "send.h"
b706b13b	25	#include "debugfs.h"
c6c8fea2	26	#include "translation-table.h"
c6c8fea2 SE	27	#include "hash.h"
	28	#include "gateway_common.h"
	29	#include "gateway_client.h"
b706b13b	30	#include "sysfs.h"
43676ab5	31	#include "originator.h"
c6c8fea2 SE	32	#include <linux/slab.h>
	33	#include <linux/ethtool.h>
	34	#include <linux/etherdevice.h>
	35	#include <linux/if_vlan.h>
	36	#include "unicast.h"
23721387	37	#include "bridge_loop_avoidance.h"
c6c8fea2 SE	38
c6c8fea2 SE	39
0294ca0d SE	40	static int batadv_get_settings(struct net_device dev, struct ethtool_cmd cmd);
	41	static void batadv_get_drvinfo(struct net_device *dev,
	42	struct ethtool_drvinfo *info);
	43	static u32 batadv_get_msglevel(struct net_device *dev);
	44	static void batadv_set_msglevel(struct net_device *dev, u32 value);
	45	static u32 batadv_get_link(struct net_device *dev);
f8214865 MH	46	static void batadv_get_strings(struct net_device dev, u32 stringset, u8 data);
	47	static void batadv_get_ethtool_stats(struct net_device *dev,
	48	struct ethtool_stats stats, u64 data);
	49	static int batadv_get_sset_count(struct net_device *dev, int stringset);
c6c8fea2	50
0294ca0d SE	51	static const struct ethtool_ops batadv_ethtool_ops = {
	52	.get_settings = batadv_get_settings,
	53	.get_drvinfo = batadv_get_drvinfo,
	54	.get_msglevel = batadv_get_msglevel,
	55	.set_msglevel = batadv_set_msglevel,
	56	.get_link = batadv_get_link,
f8214865 MH	57	.get_strings = batadv_get_strings,
	58	.get_ethtool_stats = batadv_get_ethtool_stats,
	59	.get_sset_count = batadv_get_sset_count,
c6c8fea2 SE	60	};
c6c8fea2 SE	61
04b482a2	62	int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
c6c8fea2 SE	63	{
	64	int result;
	65
9cfc7bd6	66	/* TODO: We must check if we can release all references to non-payload
c6c8fea2 SE	67	* data using skb_header_release in our skbs to allow skb_cow_header to
	68	* work optimally. This means that those skbs are not allowed to read
	69	* or write any data which is before the current position of skb->data
	70	* after that call and thus allow other skbs with the same data buffer
	71	* to write freely in that area.
	72	*/
	73	result = skb_cow_head(skb, len);
	74	if (result < 0)
	75	return result;
	76
	77	skb_push(skb, len);
	78	return 0;
	79	}
	80
0294ca0d	81	static int batadv_interface_open(struct net_device *dev)
c6c8fea2 SE	82	{
	83	netif_start_queue(dev);
	84	return 0;
	85	}
	86
0294ca0d	87	static int batadv_interface_release(struct net_device *dev)
c6c8fea2 SE	88	{
	89	netif_stop_queue(dev);
	90	return 0;
	91	}
	92
0294ca0d	93	static struct net_device_stats batadv_interface_stats(struct net_device dev)
c6c8fea2	94	{
56303d34	95	struct batadv_priv *bat_priv = netdev_priv(dev);
1c9b0550 ML	96	struct net_device_stats *stats = &bat_priv->stats;
	97
	98	stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
	99	stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
	100	stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
	101	stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
	102	stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
	103	return stats;
c6c8fea2 SE	104	}
c6c8fea2 SE	105
0294ca0d	106	static int batadv_interface_set_mac_addr(struct net_device dev, void p)
c6c8fea2	107	{
56303d34	108	struct batadv_priv *bat_priv = netdev_priv(dev);
c6c8fea2	109	struct sockaddr *addr = p;
40a3eb33	110	uint8_t old_addr[ETH_ALEN];
c6c8fea2 SE	111
	112	if (!is_valid_ether_addr(addr->sa_data))
	113	return -EADDRNOTAVAIL;
	114
40a3eb33 D	115	memcpy(old_addr, dev->dev_addr, ETH_ALEN);
	116	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	117
015758d0	118	/* only modify transtable if it has been initialized before */
39c75a51	119	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
40a3eb33	120	batadv_tt_local_remove(bat_priv, old_addr,
08c36d3e	121	"mac address changed", false);
42d0b044	122	batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
c6c8fea2 SE	123	}
c6c8fea2 SE	124
28009a6c	125	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
c6c8fea2 SE	126	return 0;
	127	}
	128
0294ca0d	129	static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
c6c8fea2 SE	130	{
c6c8fea2 SE	131	/* check ranges */
9563877e	132	if ((new_mtu < 68) \|\| (new_mtu > batadv_hardif_min_mtu(dev)))
c6c8fea2 SE	133	return -EINVAL;
	134
	135	dev->mtu = new_mtu;
	136
	137	return 0;
	138	}
	139
0294ca0d SE	140	static int batadv_interface_tx(struct sk_buff *skb,
0294ca0d SE	141	struct net_device *soft_iface)
c6c8fea2 SE	142	{
c6c8fea2 SE	143	struct ethhdr ethhdr = (struct ethhdr )skb->data;
56303d34 SE	144	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
56303d34 SE	145	struct batadv_hard_iface *primary_if = NULL;
96412690	146	struct batadv_bcast_packet *bcast_packet;
c6c8fea2	147	struct vlan_ethhdr *vhdr;
7e071c79	148	__be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
b1a8c04b SW	149	static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
b1a8c04b SW	150	0x00};
be7af5cf	151	unsigned int header_len = 0;
c6c8fea2	152	int data_len = skb->len, ret;
7a5cc242	153	short vid __maybe_unused = -1;
be7af5cf	154	bool do_bcast = false;
bbb1f90e	155	uint32_t seqno;
c6c8fea2	156
39c75a51	157	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
c6c8fea2 SE	158	goto dropped;
	159
	160	soft_iface->trans_start = jiffies;
	161
	162	switch (ntohs(ethhdr->h_proto)) {
	163	case ETH_P_8021Q:
	164	vhdr = (struct vlan_ethhdr *)skb->data;
	165	vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
	166
7e071c79	167	if (vhdr->h_vlan_encapsulated_proto != ethertype)
c6c8fea2 SE	168	break;
	169
	170	/* fall through */
7e071c79	171	case BATADV_ETH_P_BATMAN:
c6c8fea2	172	goto dropped;
a7f6ee94	173	}
c6c8fea2	174
08adf151	175	if (batadv_bla_tx(bat_priv, skb, vid))
23721387 SW	176	goto dropped;
23721387 SW	177
a73105b8	178	/* Register the client MAC in the transtable */
08c36d3e	179	batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
c6c8fea2	180
b1a8c04b SW	181	/* don't accept stp packets. STP does not help in meshes.
	182	* better use the bridge loop avoidance ...
	183	*/
1eda58bf	184	if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
b1a8c04b SW	185	goto dropped;
b1a8c04b SW	186
be7af5cf ML	187	if (is_multicast_ether_addr(ethhdr->h_dest)) {
be7af5cf ML	188	do_bcast = true;
c6c8fea2	189
be7af5cf	190	switch (atomic_read(&bat_priv->gw_mode)) {
cd646ab1	191	case BATADV_GW_MODE_SERVER:
be7af5cf	192	/* gateway servers should not send dhcp
9cfc7bd6 SE	193	* requests into the mesh
9cfc7bd6 SE	194	*/
7cf06bc6	195	ret = batadv_gw_is_dhcp_target(skb, &header_len);
be7af5cf ML	196	if (ret)
	197	goto dropped;
	198	break;
cd646ab1	199	case BATADV_GW_MODE_CLIENT:
be7af5cf	200	/* gateway clients should send dhcp requests
9cfc7bd6 SE	201	* via unicast to their gateway
9cfc7bd6 SE	202	*/
7cf06bc6	203	ret = batadv_gw_is_dhcp_target(skb, &header_len);
be7af5cf ML	204	if (ret)
	205	do_bcast = false;
	206	break;
cd646ab1	207	case BATADV_GW_MODE_OFF:
be7af5cf ML	208	default:
	209	break;
	210	}
c6c8fea2 SE	211	}
	212
	213	/* ethernet packet should be broadcasted */
	214	if (do_bcast) {
e5d89254	215	primary_if = batadv_primary_if_get_selected(bat_priv);
32ae9b22	216	if (!primary_if)
c6c8fea2 SE	217	goto dropped;
c6c8fea2 SE	218
04b482a2	219	if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
c6c8fea2 SE	220	goto dropped;
c6c8fea2 SE	221
96412690	222	bcast_packet = (struct batadv_bcast_packet *)skb->data;
7e071c79	223	bcast_packet->header.version = BATADV_COMPAT_VERSION;
42d0b044	224	bcast_packet->header.ttl = BATADV_TTL;
c6c8fea2 SE	225
c6c8fea2 SE	226	/* batman packet type: broadcast */
acd34afa	227	bcast_packet->header.packet_type = BATADV_BCAST;
162d549c	228	bcast_packet->reserved = 0;
c6c8fea2 SE	229
c6c8fea2 SE	230	/* hw address of first interface is the orig mac because only
9cfc7bd6 SE	231	* this mac is known throughout the mesh
9cfc7bd6 SE	232	*/
c6c8fea2	233	memcpy(bcast_packet->orig,
32ae9b22	234	primary_if->net_dev->dev_addr, ETH_ALEN);
c6c8fea2 SE	235
c6c8fea2 SE	236	/* set broadcast sequence number */
bbb1f90e SE	237	seqno = atomic_inc_return(&bat_priv->bcast_seqno);
bbb1f90e SE	238	bcast_packet->seqno = htonl(seqno);
c6c8fea2	239
9455e34c	240	batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
c6c8fea2 SE	241
c6c8fea2 SE	242	/* a copy is stored in the bcast list, therefore removing
9cfc7bd6 SE	243	* the original skb.
9cfc7bd6 SE	244	*/
c6c8fea2 SE	245	kfree_skb(skb);
	246
	247	/* unicast packet */
	248	} else {
cd646ab1	249	if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
7cf06bc6	250	ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
be7af5cf ML	251	if (ret)
	252	goto dropped;
	253	}
	254
88ed1e77	255	ret = batadv_unicast_send_skb(skb, bat_priv);
c6c8fea2 SE	256	if (ret != 0)
	257	goto dropped_freed;
	258	}
	259
1c9b0550 ML	260	batadv_inc_counter(bat_priv, BATADV_CNT_TX);
1c9b0550 ML	261	batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
c6c8fea2 SE	262	goto end;
	263
	264	dropped:
	265	kfree_skb(skb);
	266	dropped_freed:
1c9b0550	267	batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
c6c8fea2	268	end:
32ae9b22	269	if (primary_if)
e5d89254	270	batadv_hardif_free_ref(primary_if);
c6c8fea2 SE	271	return NETDEV_TX_OK;
	272	}
	273
04b482a2	274	void batadv_interface_rx(struct net_device *soft_iface,
56303d34	275	struct sk_buff skb, struct batadv_hard_iface recv_if,
37135173	276	int hdr_size, struct batadv_orig_node *orig_node)
c6c8fea2	277	{
56303d34	278	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
c6c8fea2 SE	279	struct ethhdr *ethhdr;
c6c8fea2 SE	280	struct vlan_ethhdr *vhdr;
04c9f416	281	struct batadv_header batadv_header = (struct batadv_header )skb->data;
7a5cc242	282	short vid __maybe_unused = -1;
7e071c79	283	__be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
2d3f6ccc SW	284	bool is_bcast;
2d3f6ccc SW	285
04c9f416	286	is_bcast = (batadv_header->packet_type == BATADV_BCAST);
c6c8fea2 SE	287
	288	/* check if enough space is available for pulling, and pull */
	289	if (!pskb_may_pull(skb, hdr_size))
	290	goto dropped;
	291
	292	skb_pull_rcsum(skb, hdr_size);
	293	skb_reset_mac_header(skb);
	294
	295	ethhdr = (struct ethhdr *)skb_mac_header(skb);
	296
	297	switch (ntohs(ethhdr->h_proto)) {
	298	case ETH_P_8021Q:
	299	vhdr = (struct vlan_ethhdr *)skb->data;
	300	vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
	301
7e071c79	302	if (vhdr->h_vlan_encapsulated_proto != ethertype)
c6c8fea2 SE	303	break;
	304
	305	/* fall through */
7e071c79	306	case BATADV_ETH_P_BATMAN:
c6c8fea2 SE	307	goto dropped;
	308	}
	309
c6c8fea2 SE	310	/* skb->dev & skb->pkt_type are set here */
	311	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
	312	goto dropped;
	313	skb->protocol = eth_type_trans(skb, soft_iface);
	314
25985edc	315	/* should not be necessary anymore as we use skb_pull_rcsum()
c6c8fea2	316	* TODO: please verify this and remove this TODO
9cfc7bd6 SE	317	* -- Dec 21st 2009, Simon Wunderlich
9cfc7bd6 SE	318	*/
c6c8fea2	319
9cfc7bd6	320	/* skb->ip_summed = CHECKSUM_UNNECESSARY; */
c6c8fea2	321
1c9b0550 ML	322	batadv_inc_counter(bat_priv, BATADV_CNT_RX);
	323	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
	324	skb->len + ETH_HLEN);
c6c8fea2 SE	325
	326	soft_iface->last_rx = jiffies;
	327
37135173 AQ	328	if (orig_node)
	329	batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
	330	ethhdr->h_source);
	331
08c36d3e	332	if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
59b699cd AQ	333	goto dropped;
59b699cd AQ	334
23721387 SW	335	/* Let the bridge loop avoidance check the packet. If will
	336	* not handle it, we can safely push it up.
	337	*/
04c9f416	338	if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
23721387 SW	339	goto out;
23721387 SW	340
c6c8fea2	341	netif_rx(skb);
ba85fac2	342	goto out;
c6c8fea2 SE	343
	344	dropped:
	345	kfree_skb(skb);
	346	out:
	347	return;
	348	}
	349
0294ca0d SE	350	static const struct net_device_ops batadv_netdev_ops = {
	351	.ndo_open = batadv_interface_open,
	352	.ndo_stop = batadv_interface_release,
	353	.ndo_get_stats = batadv_interface_stats,
	354	.ndo_set_mac_address = batadv_interface_set_mac_addr,
	355	.ndo_change_mtu = batadv_interface_change_mtu,
	356	.ndo_start_xmit = batadv_interface_tx,
c6c8fea2 SE	357	.ndo_validate_addr = eth_validate_addr
c6c8fea2 SE	358	};
c6c8fea2	359
0294ca0d	360	static void batadv_interface_setup(struct net_device *dev)
c6c8fea2	361	{
56303d34	362	struct batadv_priv *priv = netdev_priv(dev);
c6c8fea2 SE	363
	364	ether_setup(dev);
	365
0294ca0d	366	dev->netdev_ops = &batadv_netdev_ops;
c6c8fea2	367	dev->destructor = free_netdev;
af20b710	368	dev->tx_queue_len = 0;
c6c8fea2	369
9cfc7bd6	370	/* can't call min_mtu, because the needed variables
c6c8fea2 SE	371	* have not been initialized yet
	372	*/
	373	dev->mtu = ETH_DATA_LEN;
6e215fd8	374	/* reserve more space in the skbuff for our header */
c11fdfae	375	dev->hard_header_len = BATADV_HEADER_LEN;
c6c8fea2 SE	376
c6c8fea2 SE	377	/* generate random address */
28009a6c	378	eth_hw_addr_random(dev);
c6c8fea2	379
0294ca0d	380	SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
c6c8fea2	381
704509b8	382	memset(priv, 0, sizeof(*priv));
c6c8fea2 SE	383	}
c6c8fea2 SE	384
04b482a2	385	struct net_device batadv_softif_create(const char name)
c6c8fea2 SE	386	{
c6c8fea2 SE	387	struct net_device *soft_iface;
56303d34	388	struct batadv_priv *bat_priv;
c6c8fea2	389	int ret;
d69909d2	390	size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
c6c8fea2	391
0294ca0d SE	392	soft_iface = alloc_netdev(sizeof(*bat_priv), name,
0294ca0d SE	393	batadv_interface_setup);
c6c8fea2	394
320f422f	395	if (!soft_iface)
c6c8fea2	396	goto out;
c6c8fea2	397
1c9b0550 ML	398	bat_priv = netdev_priv(soft_iface);
	399
	400	/* batadv_interface_stats() needs to be available as soon as
	401	* register_netdevice() has been called
	402	*/
	403	bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
	404	if (!bat_priv->bat_counters)
	405	goto free_soft_iface;
	406
c3caf519	407	ret = register_netdevice(soft_iface);
c6c8fea2 SE	408	if (ret < 0) {
	409	pr_err("Unable to register the batman interface '%s': %i\n",
	410	name, ret);
1c9b0550	411	goto free_bat_counters;
c6c8fea2 SE	412	}
c6c8fea2 SE	413
c6c8fea2 SE	414	atomic_set(&bat_priv->aggregated_ogms, 1);
c6c8fea2 SE	415	atomic_set(&bat_priv->bonding, 0);
23721387	416	atomic_set(&bat_priv->bridge_loop_avoidance, 0);
59b699cd	417	atomic_set(&bat_priv->ap_isolation, 0);
acd34afa	418	atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
cd646ab1	419	atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
c6c8fea2 SE	420	atomic_set(&bat_priv->gw_sel_class, 20);
	421	atomic_set(&bat_priv->gw_bandwidth, 41);
	422	atomic_set(&bat_priv->orig_interval, 1000);
8681a1c4	423	atomic_set(&bat_priv->hop_penalty, 30);
c6c8fea2 SE	424	atomic_set(&bat_priv->log_level, 0);
c6c8fea2 SE	425	atomic_set(&bat_priv->fragmentation, 1);
42d0b044 SE	426	atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
42d0b044 SE	427	atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
c6c8fea2	428
39c75a51	429	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
c6c8fea2	430	atomic_set(&bat_priv->bcast_seqno, 1);
807736f6 SE	431	atomic_set(&bat_priv->tt.vn, 0);
	432	atomic_set(&bat_priv->tt.local_changes, 0);
	433	atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
	434	#ifdef CONFIG_BATMAN_ADV_BLA
	435	atomic_set(&bat_priv->bla.num_requests, 0);
	436	#endif
	437	bat_priv->tt.last_changeset = NULL;
	438	bat_priv->tt.last_changeset_len = 0;
	439	bat_priv->tt.poss_change = false;
c6c8fea2 SE	440
	441	bat_priv->primary_if = NULL;
	442	bat_priv->num_ifaces = 0;
c6c8fea2	443
3193e8fd	444	ret = batadv_algo_select(bat_priv, batadv_routing_algo);
1c280471	445	if (ret < 0)
1c9b0550	446	goto unreg_soft_iface;
1c280471	447
5853e22c	448	ret = batadv_sysfs_add_meshif(soft_iface);
c6c8fea2	449	if (ret < 0)
1c9b0550	450	goto unreg_soft_iface;
c6c8fea2	451
40a072d7	452	ret = batadv_debugfs_add_meshif(soft_iface);
c6c8fea2 SE	453	if (ret < 0)
	454	goto unreg_sysfs;
	455
3193e8fd	456	ret = batadv_mesh_init(soft_iface);
c6c8fea2 SE	457	if (ret < 0)
	458	goto unreg_debugfs;
	459
	460	return soft_iface;
	461
	462	unreg_debugfs:
40a072d7	463	batadv_debugfs_del_meshif(soft_iface);
c6c8fea2	464	unreg_sysfs:
5853e22c	465	batadv_sysfs_del_meshif(soft_iface);
c6c8fea2	466	unreg_soft_iface:
1c9b0550	467	free_percpu(bat_priv->bat_counters);
06ba7ce2	468	unregister_netdevice(soft_iface);
c6c8fea2 SE	469	return NULL;
c6c8fea2 SE	470
1c9b0550 ML	471	free_bat_counters:
1c9b0550 ML	472	free_percpu(bat_priv->bat_counters);
c6c8fea2 SE	473	free_soft_iface:
	474	free_netdev(soft_iface);
	475	out:
	476	return NULL;
	477	}
	478
04b482a2	479	void batadv_softif_destroy(struct net_device *soft_iface)
c6c8fea2	480	{
40a072d7	481	batadv_debugfs_del_meshif(soft_iface);
5853e22c	482	batadv_sysfs_del_meshif(soft_iface);
3193e8fd	483	batadv_mesh_free(soft_iface);
c6c8fea2 SE	484	unregister_netdevice(soft_iface);
	485	}
	486
04b482a2	487	int batadv_softif_is_valid(const struct net_device *net_dev)
e44d8fe2	488	{
0294ca0d	489	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
e44d8fe2	490	return 1;
e44d8fe2 SE	491
	492	return 0;
	493	}
	494
c6c8fea2	495	/* ethtool */
0294ca0d	496	static int batadv_get_settings(struct net_device dev, struct ethtool_cmd cmd)
c6c8fea2 SE	497	{
	498	cmd->supported = 0;
	499	cmd->advertising = 0;
70739497	500	ethtool_cmd_speed_set(cmd, SPEED_10);
c6c8fea2 SE	501	cmd->duplex = DUPLEX_FULL;
	502	cmd->port = PORT_TP;
	503	cmd->phy_address = 0;
	504	cmd->transceiver = XCVR_INTERNAL;
	505	cmd->autoneg = AUTONEG_DISABLE;
	506	cmd->maxtxpkt = 0;
	507	cmd->maxrxpkt = 0;
	508
	509	return 0;
	510	}
	511
0294ca0d SE	512	static void batadv_get_drvinfo(struct net_device *dev,
0294ca0d SE	513	struct ethtool_drvinfo *info)
c6c8fea2 SE	514	{
c6c8fea2 SE	515	strcpy(info->driver, "B.A.T.M.A.N. advanced");
42d0b044	516	strcpy(info->version, BATADV_SOURCE_VERSION);
c6c8fea2 SE	517	strcpy(info->fw_version, "N/A");
	518	strcpy(info->bus_info, "batman");
	519	}
	520
0294ca0d	521	static u32 batadv_get_msglevel(struct net_device *dev)
c6c8fea2 SE	522	{
	523	return -EOPNOTSUPP;
	524	}
	525
0294ca0d	526	static void batadv_set_msglevel(struct net_device *dev, u32 value)
c6c8fea2 SE	527	{
	528	}
	529
0294ca0d	530	static u32 batadv_get_link(struct net_device *dev)
c6c8fea2 SE	531	{
	532	return 1;
	533	}
f8214865 MH	534
	535	/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
	536	* Declare each description string in struct.name[] to get fixed sized buffer
	537	* and compile time checking for strings longer than ETH_GSTRING_LEN.
	538	*/
	539	static const struct {
	540	const char name[ETH_GSTRING_LEN];
0294ca0d	541	} batadv_counters_strings[] = {
1c9b0550 ML	542	{ "tx" },
	543	{ "tx_bytes" },
	544	{ "tx_dropped" },
	545	{ "rx" },
	546	{ "rx_bytes" },
f8214865 MH	547	{ "forward" },
	548	{ "forward_bytes" },
	549	{ "mgmt_tx" },
	550	{ "mgmt_tx_bytes" },
	551	{ "mgmt_rx" },
	552	{ "mgmt_rx_bytes" },
	553	{ "tt_request_tx" },
	554	{ "tt_request_rx" },
	555	{ "tt_response_tx" },
	556	{ "tt_response_rx" },
	557	{ "tt_roam_adv_tx" },
	558	{ "tt_roam_adv_rx" },
	559	};
	560
	561	static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
	562	uint8_t *data)
	563	{
	564	if (stringset == ETH_SS_STATS)
0294ca0d SE	565	memcpy(data, batadv_counters_strings,
0294ca0d SE	566	sizeof(batadv_counters_strings));
f8214865 MH	567	}
	568
	569	static void batadv_get_ethtool_stats(struct net_device *dev,
	570	struct ethtool_stats *stats,
	571	uint64_t *data)
	572	{
56303d34	573	struct batadv_priv *bat_priv = netdev_priv(dev);
f8214865 MH	574	int i;
f8214865 MH	575
d69909d2	576	for (i = 0; i < BATADV_CNT_NUM; i++)
f8214865 MH	577	data[i] = batadv_sum_counter(bat_priv, i);
	578	}
	579
	580	static int batadv_get_sset_count(struct net_device *dev, int stringset)
	581	{
	582	if (stringset == ETH_SS_STATS)
d69909d2	583	return BATADV_CNT_NUM;
f8214865 MH	584
	585	return -EOPNOTSUPP;
	586	}