1 files changed, 697 insertions, 0 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
new file mode 100644
index 000000000000..e89ede192ed0
--- /dev/null
+++ b/net/batman-adv/soft-interface.c
@@ -0,0 +1,697 @@
+/*
+ * Copyright (C) 2007-2010 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 "bat_debugfs.h"
+#include "translation-table.h"
+#include "types.h"
+#include "hash.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "send.h"
+#include "bat_sysfs.h"
+#include <linux/slab.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
+#include "unicast.h"
+#include "routing.h"
+
+
+static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static void bat_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info);
+static u32 bat_get_msglevel(struct net_device *dev);
+static void bat_set_msglevel(struct net_device *dev, u32 value);
+static u32 bat_get_link(struct net_device *dev);
+static u32 bat_get_rx_csum(struct net_device *dev);
+static int bat_set_rx_csum(struct net_device *dev, u32 data);
+
+static const struct ethtool_ops bat_ethtool_ops = {
+	.get_settings = bat_get_settings,
+	.get_drvinfo = bat_get_drvinfo,
+	.get_msglevel = bat_get_msglevel,
+	.set_msglevel = bat_set_msglevel,
+	.get_link = bat_get_link,
+	.get_rx_csum = bat_get_rx_csum,
+	.set_rx_csum = bat_set_rx_csum
+};
+
+int my_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 void softif_neigh_free_ref(struct kref *refcount)
+{
+	struct softif_neigh *softif_neigh;
+
+	softif_neigh = container_of(refcount, struct softif_neigh, refcount);
+	kfree(softif_neigh);
+}
+
+static void softif_neigh_free_rcu(struct rcu_head *rcu)
+{
+	struct softif_neigh *softif_neigh;
+
+	softif_neigh = container_of(rcu, struct softif_neigh, rcu);
+	kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+}
+
+void softif_neigh_purge(struct bat_priv *bat_priv)
+{
+	struct softif_neigh *softif_neigh, *softif_neigh_tmp;
+	struct hlist_node *node, *node_tmp;
+
+	spin_lock_bh(&bat_priv->softif_neigh_lock);
+
+	hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
+				  &bat_priv->softif_neigh_list, list) {
+
+		if ((!time_after(jiffies, softif_neigh->last_seen +
+				msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
+		    (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
+			continue;
+
+		hlist_del_rcu(&softif_neigh->list);
+
+		if (bat_priv->softif_neigh == softif_neigh) {
+			bat_dbg(DBG_ROUTES, bat_priv,
+				 "Current mesh exit point '%pM' vanished "
+				 "(vid: %d).\n",
+				 softif_neigh->addr, softif_neigh->vid);
+			softif_neigh_tmp = bat_priv->softif_neigh;
+			bat_priv->softif_neigh = NULL;
+			kref_put(&softif_neigh_tmp->refcount,
+				 softif_neigh_free_ref);
+		}
+
+		call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
+	}
+
+	spin_unlock_bh(&bat_priv->softif_neigh_lock);
+}
+
+static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
+					     uint8_t *addr, short vid)
+{
+	struct softif_neigh *softif_neigh;
+	struct hlist_node *node;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(softif_neigh, node,
+				 &bat_priv->softif_neigh_list, list) {
+		if (memcmp(softif_neigh->addr, addr, ETH_ALEN) != 0)
+			continue;
+
+		if (softif_neigh->vid != vid)
+			continue;
+
+		softif_neigh->last_seen = jiffies;
+		goto found;
+	}
+
+	softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
+	if (!softif_neigh)
+		goto out;
+
+	memcpy(softif_neigh->addr, addr, ETH_ALEN);
+	softif_neigh->vid = vid;
+	softif_neigh->last_seen = jiffies;
+	kref_init(&softif_neigh->refcount);
+
+	INIT_HLIST_NODE(&softif_neigh->list);
+	spin_lock_bh(&bat_priv->softif_neigh_lock);
+	hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
+	spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+found:
+	kref_get(&softif_neigh->refcount);
+out:
+	rcu_read_unlock();
+	return softif_neigh;
+}
+
+int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct softif_neigh *softif_neigh;
+	struct hlist_node *node;
+	size_t buf_size, pos;
+	char *buff;
+
+	if (!bat_priv->primary_if) {
+		return seq_printf(seq, "BATMAN mesh %s disabled - "
+			       "please specify interfaces to enable it\n",
+			       net_dev->name);
+	}
+
+	seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
+
+	buf_size = 1;
+	/* Estimate length for: "   xx:xx:xx:xx:xx:xx\n" */
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(softif_neigh, node,
+				 &bat_priv->softif_neigh_list, list)
+		buf_size += 30;
+	rcu_read_unlock();
+
+	buff = kmalloc(buf_size, GFP_ATOMIC);
+	if (!buff)
+		return -ENOMEM;
+
+	buff[0] = '\0';
+	pos = 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(softif_neigh, node,
+				 &bat_priv->softif_neigh_list, list) {
+		pos += snprintf(buff + pos, 31, "%s %pM (vid: %d)\n",
+				bat_priv->softif_neigh == softif_neigh
+				? "=>" : "  ", softif_neigh->addr,
+				softif_neigh->vid);
+	}
+	rcu_read_unlock();
+
+	seq_printf(seq, "%s", buff);
+	kfree(buff);
+	return 0;
+}
+
+static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
+			       short vid)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct batman_packet *batman_packet;
+	struct softif_neigh *softif_neigh, *softif_neigh_tmp;
+
+	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
+		batman_packet = (struct batman_packet *)
+					(skb->data + ETH_HLEN + VLAN_HLEN);
+	else
+		batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
+
+	if (batman_packet->version != COMPAT_VERSION)
+		goto err;
+
+	if (batman_packet->packet_type != BAT_PACKET)
+		goto err;
+
+	if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
+		goto err;
+
+	if (is_my_mac(batman_packet->orig))
+		goto err;
+
+	softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
+
+	if (!softif_neigh)
+		goto err;
+
+	if (bat_priv->softif_neigh == softif_neigh)
+		goto out;
+
+	/* we got a neighbor but its mac is 'bigger' than ours  */
+	if (memcmp(bat_priv->primary_if->net_dev->dev_addr,
+		   softif_neigh->addr, ETH_ALEN) < 0)
+		goto out;
+
+	/* switch to new 'smallest neighbor' */
+	if ((bat_priv->softif_neigh) &&
+	    (memcmp(softif_neigh->addr, bat_priv->softif_neigh->addr,
+							ETH_ALEN) < 0)) {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Changing mesh exit point from %pM (vid: %d) "
+			"to %pM (vid: %d).\n",
+			 bat_priv->softif_neigh->addr,
+			 bat_priv->softif_neigh->vid,
+			 softif_neigh->addr, softif_neigh->vid);
+		softif_neigh_tmp = bat_priv->softif_neigh;
+		bat_priv->softif_neigh = softif_neigh;
+		kref_put(&softif_neigh_tmp->refcount, softif_neigh_free_ref);
+		/* we need to hold the additional reference */
+		goto err;
+	}
+
+	/* close own batX device and use softif_neigh as exit node */
+	if ((!bat_priv->softif_neigh) &&
+	    (memcmp(softif_neigh->addr,
+		    bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Setting mesh exit point to %pM (vid: %d).\n",
+			softif_neigh->addr, softif_neigh->vid);
+		bat_priv->softif_neigh = softif_neigh;
+		/* we need to hold the additional reference */
+		goto err;
+	}
+
+out:
+	kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+err:
+	kfree_skb(skb);
+	return;
+}
+
+static int interface_open(struct net_device *dev)
+{
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int interface_release(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static struct net_device_stats *interface_stats(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	return &bat_priv->stats;
+}
+
+static int interface_set_mac_addr(struct net_device *dev, void *p)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	/* only modify hna-table if it has been initialised before */
+	if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
+		hna_local_remove(bat_priv, dev->dev_addr,
+				 "mac address changed");
+		hna_local_add(dev, addr->sa_data);
+	}
+
+	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+	return 0;
+}
+
+static int interface_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/* check ranges */
+	if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	struct bcast_packet *bcast_packet;
+	struct vlan_ethhdr *vhdr;
+	int data_len = skb->len, ret;
+	short vid = -1;
+	bool do_bcast = false;
+
+	if (atomic_read(&bat_priv->mesh_state) != 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 (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
+			break;
+
+		/* fall through */
+	case ETH_P_BATMAN:
+		softif_batman_recv(skb, soft_iface, vid);
+		goto end;
+	}
+
+	/**
+	 * if we have a another chosen mesh exit node in range
+	 * it will transport the packets to the mesh
+	 */
+	if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid))
+		goto dropped;
+
+	/* TODO: check this for locks */
+	hna_local_add(soft_iface, ethhdr->h_source);
+
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+		ret = gw_is_target(bat_priv, skb);
+
+		if (ret < 0)
+			goto dropped;
+
+		if (ret == 0)
+			do_bcast = true;
+	}
+
+	/* ethernet packet should be broadcasted */
+	if (do_bcast) {
+		if (!bat_priv->primary_if)
+			goto dropped;
+
+		if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
+			goto dropped;
+
+		bcast_packet = (struct bcast_packet *)skb->data;
+		bcast_packet->version = COMPAT_VERSION;
+		bcast_packet->ttl = TTL;
+
+		/* batman packet type: broadcast */
+		bcast_packet->packet_type = BAT_BCAST;
+
+		/* hw address of first interface is the orig mac because only
+		 * this mac is known throughout the mesh */
+		memcpy(bcast_packet->orig,
+		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+
+		/* set broadcast sequence number */
+		bcast_packet->seqno =
+			htonl(atomic_inc_return(&bat_priv->bcast_seqno));
+
+		add_bcast_packet_to_list(bat_priv, skb);
+
+		/* a copy is stored in the bcast list, therefore removing
+		 * the original skb. */
+		kfree_skb(skb);
+
+	/* unicast packet */
+	} else {
+		ret = unicast_send_skb(skb, bat_priv);
+		if (ret != 0)
+			goto dropped_freed;
+	}
+
+	bat_priv->stats.tx_packets++;
+	bat_priv->stats.tx_bytes += data_len;
+	goto end;
+
+dropped:
+	kfree_skb(skb);
+dropped_freed:
+	bat_priv->stats.tx_dropped++;
+end:
+	return NETDEV_TX_OK;
+}
+
+void interface_rx(struct net_device *soft_iface,
+		  struct sk_buff *skb, struct batman_if *recv_if,
+		  int hdr_size)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	struct unicast_packet *unicast_packet;
+	struct ethhdr *ethhdr;
+	struct vlan_ethhdr *vhdr;
+	short vid = -1;
+	int ret;
+
+	/* 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 (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
+			break;
+
+		/* fall through */
+	case ETH_P_BATMAN:
+		goto dropped;
+	}
+
+	/**
+	 * if we have a another chosen mesh exit node in range
+	 * it will transport the packets to the non-mesh network
+	 */
+	if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid)) {
+		skb_push(skb, hdr_size);
+		unicast_packet = (struct unicast_packet *)skb->data;
+
+		if ((unicast_packet->packet_type != BAT_UNICAST) &&
+		    (unicast_packet->packet_type != BAT_UNICAST_FRAG))
+			goto dropped;
+
+		skb_reset_mac_header(skb);
+
+		memcpy(unicast_packet->dest,
+		       bat_priv->softif_neigh->addr, ETH_ALEN);
+		ret = route_unicast_packet(skb, recv_if, hdr_size);
+		if (ret == NET_RX_DROP)
+			goto dropped;
+
+		goto out;
+	}
+
+	/* 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 neccesary 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;*/
+
+	bat_priv->stats.rx_packets++;
+	bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
+
+	soft_iface->last_rx = jiffies;
+
+	netif_rx(skb);
+	return;
+
+dropped:
+	kfree_skb(skb);
+out:
+	return;
+}
+
+#ifdef HAVE_NET_DEVICE_OPS
+static const struct net_device_ops bat_netdev_ops = {
+	.ndo_open = interface_open,
+	.ndo_stop = interface_release,
+	.ndo_get_stats = interface_stats,
+	.ndo_set_mac_address = interface_set_mac_addr,
+	.ndo_change_mtu = interface_change_mtu,
+	.ndo_start_xmit = interface_tx,
+	.ndo_validate_addr = eth_validate_addr
+};
+#endif
+
+static void interface_setup(struct net_device *dev)
+{
+	struct bat_priv *priv = netdev_priv(dev);
+	char dev_addr[ETH_ALEN];
+
+	ether_setup(dev);
+
+#ifdef HAVE_NET_DEVICE_OPS
+	dev->netdev_ops = &bat_netdev_ops;
+#else
+	dev->open = interface_open;
+	dev->stop = interface_release;
+	dev->get_stats = interface_stats;
+	dev->set_mac_address = interface_set_mac_addr;
+	dev->change_mtu = interface_change_mtu;
+	dev->hard_start_xmit = interface_tx;
+#endif
+	dev->destructor = free_netdev;
+
+	/**
+	 * can't call min_mtu, because the needed variables
+	 * have not been initialized yet
+	 */
+	dev->mtu = ETH_DATA_LEN;
+	dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
+						* skbuff for our header */
+
+	/* generate random address */
+	random_ether_addr(dev_addr);
+	memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
+
+	SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
+
+	memset(priv, 0, sizeof(struct bat_priv));
+}
+
+struct net_device *softif_create(char *name)
+{
+	struct net_device *soft_iface;
+	struct bat_priv *bat_priv;
+	int ret;
+
+	soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
+				   interface_setup);
+
+	if (!soft_iface) {
+		pr_err("Unable to allocate the batman interface: %s\n", name);
+		goto out;
+	}
+
+	ret = register_netdev(soft_iface);
+	if (ret < 0) {
+		pr_err("Unable to register the batman interface '%s': %i\n",
+		       name, ret);
+		goto free_soft_iface;
+	}
+
+	bat_priv = netdev_priv(soft_iface);
+
+	atomic_set(&bat_priv->aggregated_ogms, 1);
+	atomic_set(&bat_priv->bonding, 0);
+	atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
+	atomic_set(&bat_priv->gw_mode, 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, 10);
+	atomic_set(&bat_priv->log_level, 0);
+	atomic_set(&bat_priv->fragmentation, 1);
+	atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
+	atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
+
+	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
+	atomic_set(&bat_priv->bcast_seqno, 1);
+	atomic_set(&bat_priv->hna_local_changed, 0);
+
+	bat_priv->primary_if = NULL;
+	bat_priv->num_ifaces = 0;
+	bat_priv->softif_neigh = NULL;
+
+	ret = sysfs_add_meshif(soft_iface);
+	if (ret < 0)
+		goto unreg_soft_iface;
+
+	ret = debugfs_add_meshif(soft_iface);
+	if (ret < 0)
+		goto unreg_sysfs;
+
+	ret = mesh_init(soft_iface);
+	if (ret < 0)
+		goto unreg_debugfs;
+
+	return soft_iface;
+
+unreg_debugfs:
+	debugfs_del_meshif(soft_iface);
+unreg_sysfs:
+	sysfs_del_meshif(soft_iface);
+unreg_soft_iface:
+	unregister_netdev(soft_iface);
+	return NULL;
+
+free_soft_iface:
+	free_netdev(soft_iface);
+out:
+	return NULL;
+}
+
+void softif_destroy(struct net_device *soft_iface)
+{
+	debugfs_del_meshif(soft_iface);
+	sysfs_del_meshif(soft_iface);
+	mesh_free(soft_iface);
+	unregister_netdevice(soft_iface);
+}
+
+/* ethtool */
+static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	cmd->supported = 0;
+	cmd->advertising = 0;
+	cmd->speed = 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 bat_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, "B.A.T.M.A.N. advanced");
+	strcpy(info->version, SOURCE_VERSION);
+	strcpy(info->fw_version, "N/A");
+	strcpy(info->bus_info, "batman");
+}
+
+static u32 bat_get_msglevel(struct net_device *dev)
+{
+	return -EOPNOTSUPP;
+}
+
+static void bat_set_msglevel(struct net_device *dev, u32 value)
+{
+}
+
+static u32 bat_get_link(struct net_device *dev)
+{
+	return 1;
+}
+
+static u32 bat_get_rx_csum(struct net_device *dev)
+{
+	return 0;
+}
+
+static int bat_set_rx_csum(struct net_device *dev, u32 data)
+{
+	return -EOPNOTSUPP;
+}