text: /*
   * Copyright 2007-2012 Siemens AG
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2
   * 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.
   *
   * Written by:
   * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
   * Sergey Lapin <slapin@ossfans.org>
   * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
   * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   */
  
  #include <linux/netdevice.h>
  #include <linux/module.h>
  #include <linux/if_arp.h>
  #include <linux/ieee802154.h>
  
  #include <net/nl802154.h>
  #include <net/mac802154.h>
  #include <net/ieee802154_netdev.h>
  #include <net/cfg802154.h>
  
  #include "ieee802154_i.h"
  #include "driver-ops.h"
  
  int mac802154_wpan_update_llsec(struct net_device *dev)
  {
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	int rc = 0;
  
  	if (ops->llsec) {
  		struct ieee802154_llsec_params params;
  		int changed = 0;
  
  		params.pan_id = wpan_dev->pan_id;
  		changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  
  		params.hwaddr = wpan_dev->extended_addr;
  		changed |= IEEE802154_LLSEC_PARAM_HWADDR;
  
  		rc = ops->llsec->set_params(dev, &params, changed);
  	}
  
  	return rc;
  }
  
  static int
  mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  {
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	struct sockaddr_ieee802154 *sa =
  		(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  	int err = -ENOIOCTLCMD;
  
  	if (cmd != SIOCGIFADDR && cmd != SIOCSIFADDR)
  		return err;
  
  	rtnl_lock();
  
  	switch (cmd) {
  	case SIOCGIFADDR:
  	{
  		u16 pan_id, short_addr;
  
  		pan_id = le16_to_cpu(wpan_dev->pan_id);
  		short_addr = le16_to_cpu(wpan_dev->short_addr);
  		if (pan_id == IEEE802154_PANID_BROADCAST ||
  		    short_addr == IEEE802154_ADDR_BROADCAST) {
  			err = -EADDRNOTAVAIL;
  			break;
  		}
  
  		sa->family = AF_IEEE802154;
  		sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  		sa->addr.pan_id = pan_id;
  		sa->addr.short_addr = short_addr;
  
  		err = 0;
  		break;
  	}
  	case SIOCSIFADDR:
  		if (netif_running(dev)) {
  			rtnl_unlock();
  			return -EBUSY;
  		}
  
  		dev_warn(&dev->dev,
  			 "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  		if (sa->family != AF_IEEE802154 ||
  		    sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
  		    sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
  		    sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
  		    sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
  			err = -EINVAL;
  			break;
  		}
  
  		wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
  		wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
  
  		err = mac802154_wpan_update_llsec(dev);
  		break;
  	}
  
  	rtnl_unlock();
  	return err;
  }
  
  static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
  {
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct sockaddr *addr = p;
  	__le64 extended_addr;
  
  	if (netif_running(dev))
  		return -EBUSY;
  
  	/* lowpan need to be down for update
  	 * SLAAC address after ifup
  	 */
  	if (sdata->wpan_dev.lowpan_dev) {
  		if (netif_running(sdata->wpan_dev.lowpan_dev))
  			return -EBUSY;
  	}
  
  	ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
  	if (!ieee802154_is_valid_extended_unicast_addr(extended_addr))
  		return -EINVAL;
  
  	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  	sdata->wpan_dev.extended_addr = extended_addr;
  
  	/* update lowpan interface mac address when
  	 * wpan mac has been changed
  	 */
  	if (sdata->wpan_dev.lowpan_dev)
  		memcpy(sdata->wpan_dev.lowpan_dev->dev_addr, dev->dev_addr,
  		       dev->addr_len);
  
  	return mac802154_wpan_update_llsec(dev);
  }
  
  static int ieee802154_setup_hw(struct ieee802154_sub_if_data *sdata)
  {
  	struct ieee802154_local *local = sdata->local;
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	int ret;
  
  	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
  		ret = drv_set_promiscuous_mode(local,
  					       wpan_dev->promiscuous_mode);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_AFILT) {
  		ret = drv_set_pan_id(local, wpan_dev->pan_id);
  		if (ret < 0)
  			return ret;
  
  		ret = drv_set_extended_addr(local, wpan_dev->extended_addr);
  		if (ret < 0)
  			return ret;
  
  		ret = drv_set_short_addr(local, wpan_dev->short_addr);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_LBT) {
  		ret = drv_set_lbt_mode(local, wpan_dev->lbt);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
  		ret = drv_set_csma_params(local, wpan_dev->min_be,
  					  wpan_dev->max_be,
  					  wpan_dev->csma_retries);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
  		ret = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
  		if (ret < 0)
  			return ret;
  	}
  
  	return 0;
  }
  
  static int mac802154_slave_open(struct net_device *dev)
  {
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct ieee802154_local *local = sdata->local;
  	int res;
  
  	ASSERT_RTNL();
  
  	set_bit(SDATA_STATE_RUNNING, &sdata->state);
  
  	if (!local->open_count) {
  		res = ieee802154_setup_hw(sdata);
  		if (res)
  			goto err;
  
  		res = drv_start(local);
  		if (res)
  			goto err;
  	}
  
  	local->open_count++;
  	netif_start_queue(dev);
  	return 0;
  err:
  	/* might already be clear but that doesn't matter */
  	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
  
  	return res;
  }
  
  static int
  ieee802154_check_mac_settings(struct ieee802154_local *local,
  			      struct wpan_dev *wpan_dev,
  			      struct wpan_dev *nwpan_dev)
  {
  	ASSERT_RTNL();
  
  	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
  		if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
  			return -EBUSY;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_AFILT) {
  		if (wpan_dev->pan_id != nwpan_dev->pan_id ||
  		    wpan_dev->short_addr != nwpan_dev->short_addr ||
  		    wpan_dev->extended_addr != nwpan_dev->extended_addr)
  			return -EBUSY;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
  		if (wpan_dev->min_be != nwpan_dev->min_be ||
  		    wpan_dev->max_be != nwpan_dev->max_be ||
  		    wpan_dev->csma_retries != nwpan_dev->csma_retries)
  			return -EBUSY;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
  		if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
  			return -EBUSY;
  	}
  
  	if (local->hw.flags & IEEE802154_HW_LBT) {
  		if (wpan_dev->lbt != nwpan_dev->lbt)
  			return -EBUSY;
  	}
  
  	return 0;
  }
  
  static int
  ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
  				  enum nl802154_iftype iftype)
  {
  	struct ieee802154_local *local = sdata->local;
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	struct ieee802154_sub_if_data *nsdata;
  
  	/* we hold the RTNL here so can safely walk the list */
  	list_for_each_entry(nsdata, &local->interfaces, list) {
  		if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
  			int ret;
  
  			/* TODO currently we don't support multiple node types
  			 * we need to run skb_clone at rx path. Check if there
  			 * exist really an use case if we need to support
  			 * multiple node types at the same time.
  			 */
  			if (wpan_dev->iftype == NL802154_IFTYPE_NODE &&
  			    nsdata->wpan_dev.iftype == NL802154_IFTYPE_NODE)
  				return -EBUSY;
  
  			/* check all phy mac sublayer settings are the same.
  			 * We have only one phy, different values makes trouble.
  			 */
  			ret = ieee802154_check_mac_settings(local, wpan_dev,
  							    &nsdata->wpan_dev);
  			if (ret < 0)
  				return ret;
  		}
  	}
  
  	return 0;
  }
  
  static int mac802154_wpan_open(struct net_device *dev)
  {
  	int rc;
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  
  	rc = ieee802154_check_concurrent_iface(sdata, wpan_dev->iftype);
  	if (rc < 0)
  		return rc;
  
  	return mac802154_slave_open(dev);
  }
  
  static int mac802154_slave_close(struct net_device *dev)
  {
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct ieee802154_local *local = sdata->local;
  
  	ASSERT_RTNL();
  
  	netif_stop_queue(dev);
  	local->open_count--;
  
  	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
  
  	if (!local->open_count)
  		ieee802154_stop_device(local);
  
  	return 0;
  }
  
  static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
  					 struct ieee802154_hdr *hdr,
  					 const struct ieee802154_mac_cb *cb)
  {
  	struct ieee802154_llsec_params params;
  	u8 level;
  
  	mac802154_llsec_get_params(&sdata->sec, &params);
  
  	if (!params.enabled && cb->secen_override && cb->secen)
  		return -EINVAL;
  	if (!params.enabled ||
  	    (cb->secen_override && !cb->secen) ||
  	    !params.out_level)
  		return 0;
  	if (cb->seclevel_override && !cb->seclevel)
  		return -EINVAL;
  
  	level = cb->seclevel_override ? cb->seclevel : params.out_level;
  
  	hdr->fc.security_enabled = 1;
  	hdr->sec.level = level;
  	hdr->sec.key_id_mode = params.out_key.mode;
  	if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
  		hdr->sec.short_src = params.out_key.short_source;
  	else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
  		hdr->sec.extended_src = params.out_key.extended_source;
  	hdr->sec.key_id = params.out_key.id;
  
  	return 0;
  }
  
  static int ieee802154_header_create(struct sk_buff *skb,
  				    struct net_device *dev,
  				    const struct ieee802154_addr *daddr,
  				    const struct ieee802154_addr *saddr,
  				    unsigned len)
  {
  	struct ieee802154_hdr hdr;
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	struct ieee802154_mac_cb *cb = mac_cb(skb);
  	int hlen;
  
  	if (!daddr)
  		return -EINVAL;
  
  	memset(&hdr.fc, 0, sizeof(hdr.fc));
  	hdr.fc.type = cb->type;
  	hdr.fc.security_enabled = cb->secen;
  	hdr.fc.ack_request = cb->ackreq;
  	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
  
  	if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
  		return -EINVAL;
  
  	if (!saddr) {
  		if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
  		    wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
  		    wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
  			hdr.source.mode = IEEE802154_ADDR_LONG;
  			hdr.source.extended_addr = wpan_dev->extended_addr;
  		} else {
  			hdr.source.mode = IEEE802154_ADDR_SHORT;
  			hdr.source.short_addr = wpan_dev->short_addr;
  		}
  
  		hdr.source.pan_id = wpan_dev->pan_id;
  	} else {
  		hdr.source = *(const struct ieee802154_addr *)saddr;
  	}
  
  	hdr.dest = *(const struct ieee802154_addr *)daddr;
  
  	hlen = ieee802154_hdr_push(skb, &hdr);
  	if (hlen < 0)
  		return -EINVAL;
  
  	skb_reset_mac_header(skb);
  	skb->mac_len = hlen;
  
  	if (len > ieee802154_max_payload(&hdr))
  		return -EMSGSIZE;
  
  	return hlen;
  }
  
  static const struct wpan_dev_header_ops ieee802154_header_ops = {
  	.create		= ieee802154_header_create,
  };
  
  /* This header create functionality assumes a 8 byte array for
   * source and destination pointer at maximum. To adapt this for
   * the 802.15.4 dataframe header we use extended address handling
   * here only and intra pan connection. fc fields are mostly fallback
   * handling. For provide dev_hard_header for dgram sockets.
   */
  static int mac802154_header_create(struct sk_buff *skb,
  				   struct net_device *dev,
  				   unsigned short type,
  				   const void *daddr,
  				   const void *saddr,
  				   unsigned len)
  {
  	struct ieee802154_hdr hdr;
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	struct ieee802154_mac_cb cb = { };
  	int hlen;
  
  	if (!daddr)
  		return -EINVAL;
  
  	memset(&hdr.fc, 0, sizeof(hdr.fc));
  	hdr.fc.type = IEEE802154_FC_TYPE_DATA;
  	hdr.fc.ack_request = wpan_dev->ackreq;
  	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
  
  	/* TODO currently a workaround to give zero cb block to set
  	 * security parameters defaults according MIB.
  	 */
  	if (mac802154_set_header_security(sdata, &hdr, &cb) < 0)
  		return -EINVAL;
  
  	hdr.dest.pan_id = wpan_dev->pan_id;
  	hdr.dest.mode = IEEE802154_ADDR_LONG;
  	ieee802154_be64_to_le64(&hdr.dest.extended_addr, daddr);
  
  	hdr.source.pan_id = hdr.dest.pan_id;
  	hdr.source.mode = IEEE802154_ADDR_LONG;
  
  	if (!saddr)
  		hdr.source.extended_addr = wpan_dev->extended_addr;
  	else
  		ieee802154_be64_to_le64(&hdr.source.extended_addr, saddr);
  
  	hlen = ieee802154_hdr_push(skb, &hdr);
  	if (hlen < 0)
  		return -EINVAL;
  
  	skb_reset_mac_header(skb);
  	skb->mac_len = hlen;
  
  	if (len > ieee802154_max_payload(&hdr))
  		return -EMSGSIZE;
  
  	return hlen;
  }
  
  static int
  mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
  {
  	struct ieee802154_hdr hdr;
  
  	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
  		pr_debug("malformed packet\n");
  		return 0;
  	}
  
  	if (hdr.source.mode == IEEE802154_ADDR_LONG) {
  		ieee802154_le64_to_be64(haddr, &hdr.source.extended_addr);
  		return IEEE802154_EXTENDED_ADDR_LEN;
  	}
  
  	return 0;
  }
  
  static const struct header_ops mac802154_header_ops = {
  	.create         = mac802154_header_create,
  	.parse          = mac802154_header_parse,
  };
  
  static const struct net_device_ops mac802154_wpan_ops = {
  	.ndo_open		= mac802154_wpan_open,
  	.ndo_stop		= mac802154_slave_close,
  	.ndo_start_xmit		= ieee802154_subif_start_xmit,
  	.ndo_do_ioctl		= mac802154_wpan_ioctl,
  	.ndo_set_mac_address	= mac802154_wpan_mac_addr,
  };
  
  static const struct net_device_ops mac802154_monitor_ops = {
  	.ndo_open		= mac802154_wpan_open,
  	.ndo_stop		= mac802154_slave_close,
  	.ndo_start_xmit		= ieee802154_monitor_start_xmit,
  };
  
  static void mac802154_wpan_free(struct net_device *dev)
  {
  	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  
  	mac802154_llsec_destroy(&sdata->sec);
  
  	free_netdev(dev);
  }
  
  static void ieee802154_if_setup(struct net_device *dev)
  {
  	dev->addr_len		= IEEE802154_EXTENDED_ADDR_LEN;
  	memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
  
  	/* Let hard_header_len set to IEEE802154_MIN_HEADER_LEN. AF_PACKET
  	 * will not send frames without any payload, but ack frames
  	 * has no payload, so substract one that we can send a 3 bytes
  	 * frame. The xmit callback assumes at least a hard header where two
  	 * bytes fc and sequence field are set.
  	 */
  	dev->hard_header_len	= IEEE802154_MIN_HEADER_LEN - 1;
  	/* The auth_tag header is for security and places in private payload
  	 * room of mac frame which stucks between payload and FCS field.
  	 */
  	dev->needed_tailroom	= IEEE802154_MAX_AUTH_TAG_LEN +
  				  IEEE802154_FCS_LEN;
  	/* The mtu size is the payload without mac header in this case.
  	 * We have a dynamic length header with a minimum header length
  	 * which is hard_header_len. In this case we let mtu to the size
  	 * of maximum payload which is IEEE802154_MTU - IEEE802154_FCS_LEN -
  	 * hard_header_len. The FCS which is set by hardware or ndo_start_xmit
  	 * and the minimum mac header which can be evaluated inside driver
  	 * layer. The rest of mac header will be part of payload if greater
  	 * than hard_header_len.
  	 */
  	dev->mtu		= IEEE802154_MTU - IEEE802154_FCS_LEN -
  				  dev->hard_header_len;
  	dev->tx_queue_len	= 300;
  	dev->flags		= IFF_NOARP | IFF_BROADCAST;
  }
  
  static int
  ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
  		       enum nl802154_iftype type)
  {
  	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  	int ret;
  	u8 tmp;
  
  	/* set some type-dependent values */
  	sdata->wpan_dev.iftype = type;
  
  	get_random_bytes(&tmp, sizeof(tmp));
  	atomic_set(&wpan_dev->bsn, tmp);
  	get_random_bytes(&tmp, sizeof(tmp));
  	atomic_set(&wpan_dev->dsn, tmp);
  
  	/* defaults per 802.15.4-2011 */
  	wpan_dev->min_be = 3;
  	wpan_dev->max_be = 5;
  	wpan_dev->csma_retries = 4;
  	wpan_dev->frame_retries = 3;
  
  	wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
  	wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
  
  	switch (type) {
  	case NL802154_IFTYPE_NODE:
  		ieee802154_be64_to_le64(&wpan_dev->extended_addr,
  					sdata->dev->dev_addr);
  
  		sdata->dev->header_ops = &mac802154_header_ops;
  		sdata->dev->destructor = mac802154_wpan_free;
  		sdata->dev->netdev_ops = &mac802154_wpan_ops;
  		sdata->dev->ml_priv = &mac802154_mlme_wpan;
  		wpan_dev->promiscuous_mode = false;
  		wpan_dev->header_ops = &ieee802154_header_ops;
  
  		mutex_init(&sdata->sec_mtx);
  
  		mac802154_llsec_init(&sdata->sec);
  		ret = mac802154_wpan_update_llsec(sdata->dev);
  		if (ret < 0)
  			return ret;
  
  		break;
  	case NL802154_IFTYPE_MONITOR:
  		sdata->dev->destructor = free_netdev;
  		sdata->dev->netdev_ops = &mac802154_monitor_ops;
  		wpan_dev->promiscuous_mode = true;
  		break;
  	default:
  		BUG();
  	}
  
  	return 0;
  }
  
  struct net_device *
  ieee802154_if_add(struct ieee802154_local *local, const char *name,
  		  unsigned char name_assign_type, enum nl802154_iftype type,
  		  __le64 extended_addr)
  {
  	struct net_device *ndev = NULL;
  	struct ieee802154_sub_if_data *sdata = NULL;
  	int ret = -ENOMEM;
  
  	ASSERT_RTNL();
  
  	ndev = alloc_netdev(sizeof(*sdata), name,
  			    name_assign_type, ieee802154_if_setup);
  	if (!ndev)
  		return ERR_PTR(-ENOMEM);
  
  	ndev->needed_headroom = local->hw.extra_tx_headroom +
  				IEEE802154_MAX_HEADER_LEN;
  
  	ret = dev_alloc_name(ndev, ndev->name);
  	if (ret < 0)
  		goto err;
  
  	ieee802154_le64_to_be64(ndev->perm_addr,
  				&local->hw.phy->perm_extended_addr);
  	switch (type) {
  	case NL802154_IFTYPE_NODE:
  		ndev->type = ARPHRD_IEEE802154;
  		if (ieee802154_is_valid_extended_unicast_addr(extended_addr))
  			ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
  		else
  			memcpy(ndev->dev_addr, ndev->perm_addr,
  			       IEEE802154_EXTENDED_ADDR_LEN);
  		break;
  	case NL802154_IFTYPE_MONITOR:
  		ndev->type = ARPHRD_IEEE802154_MONITOR;
  		break;
  	default:
  		ret = -EINVAL;
  		goto err;
  	}
  
  	/* TODO check this */
  	SET_NETDEV_DEV(ndev, &local->phy->dev);
  	dev_net_set(ndev, wpan_phy_net(local->hw.phy));
  	sdata = netdev_priv(ndev);
  	ndev->ieee802154_ptr = &sdata->wpan_dev;
  	memcpy(sdata->name, ndev->name, IFNAMSIZ);
  	sdata->dev = ndev;
  	sdata->wpan_dev.wpan_phy = local->hw.phy;
  	sdata->local = local;
  
  	/* setup type-dependent data */
  	ret = ieee802154_setup_sdata(sdata, type);
  	if (ret)
  		goto err;
  
  	ret = register_netdevice(ndev);
  	if (ret < 0)
  		goto err;
  
  	mutex_lock(&local->iflist_mtx);
  	list_add_tail_rcu(&sdata->list, &local->interfaces);
  	mutex_unlock(&local->iflist_mtx);
  
  	return ndev;
  
  err:
  	free_netdev(ndev);
  	return ERR_PTR(ret);
  }
  
  void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
  {
  	ASSERT_RTNL();
  
  	mutex_lock(&sdata->local->iflist_mtx);
  	list_del_rcu(&sdata->list);
  	mutex_unlock(&sdata->local->iflist_mtx);
  
  	synchronize_rcu();
  	unregister_netdevice(sdata->dev);
  }
  
  void ieee802154_remove_interfaces(struct ieee802154_local *local)
  {
  	struct ieee802154_sub_if_data *sdata, *tmp;
  
  	mutex_lock(&local->iflist_mtx);
  	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
  		list_del(&sdata->list);
  
  		unregister_netdevice(sdata->dev);
  	}
  	mutex_unlock(&local->iflist_mtx);
  }
  
  static int netdev_notify(struct notifier_block *nb,
  			 unsigned long state, void *ptr)
  {
  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  	struct ieee802154_sub_if_data *sdata;
  
  	if (state != NETDEV_CHANGENAME)
  		return NOTIFY_DONE;
  
  	if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
  		return NOTIFY_DONE;
  
  	if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
  		return NOTIFY_DONE;
  
  	sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  	memcpy(sdata->name, dev->name, IFNAMSIZ);
  
  	return NOTIFY_OK;
  }
  
  static struct notifier_block mac802154_netdev_notifier = {
  	.notifier_call = netdev_notify,
  };
  
  int ieee802154_iface_init(void)
  {
  	return register_netdevice_notifier(&mac802154_netdev_notifier);
  }
  
  void ieee802154_iface_exit(void)
  {
  	unregister_netdevice_notifier(&mac802154_netdev_notifier);
  }
  