/*

   * Copyright (c) 2008, 2009 open80211s Ltd.

   * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
   * 	       Javier Cardona <javier@cozybit.com>
   *
   * 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.
   */

  #include <linux/slab.h>

  #include <asm/unaligned.h>

  #include "ieee80211_i.h"
  #include "mesh.h"

  #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)

  #define IEEE80211_MESH_RANN_INTERVAL	     (1 * HZ)

  #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
  #define MESHCONF_CAPAB_FORWARDING    0x08

  #define TMR_RUNNING_HK	0
  #define TMR_RUNNING_MP	1

  #define TMR_RUNNING_MPR	2

  int mesh_allocated;
  static struct kmem_cache *rm_cache;
  
  void ieee80211s_init(void)
  {
  	mesh_pathtbl_init();
  	mesh_allocated = 1;
  	rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  				     0, 0, NULL);
  }
  
  void ieee80211s_stop(void)
  {
  	mesh_pathtbl_unregister();
  	kmem_cache_destroy(rm_cache);
  }

  static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  {
  	struct ieee80211_sub_if_data *sdata = (void *) data;
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

  	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);

  
  	if (local->quiescing) {
  		set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  		return;
  	}

  	ieee80211_queue_work(&local->hw, &sdata->work);

  }

  /**
   * mesh_matches_local - check if the config of a mesh point matches ours
   *
   * @ie: information elements of a management frame from the mesh peer

   * @sdata: local mesh subif

   *
   * This function checks if the mesh configuration of a mesh point matches the
   * local mesh configuration, i.e. if both nodes belong to the same mesh network.
   */

  bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)

  {

  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

  	/*
  	 * As support for each feature is added, check for matching
  	 * - On mesh config capabilities
  	 *   - Power Save Support En
  	 *   - Sync support enabled
  	 *   - Sync support active
  	 *   - Sync support required from peer
  	 *   - MDA enabled
  	 * - Power management control on fc
  	 */

  	if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  		memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&

  		(ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  		(ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  		(ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  		(ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  		(ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))

  		return true;
  
  	return false;
  }
  
  /**
   * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
   *
   * @ie: information elements of a management frame from the mesh peer

   */

  bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)

  {

  	return (ie->mesh_config->meshconf_cap &

  	    MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;

  }
  
  /**
   * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
   *

   * @sdata: mesh interface in which mesh beacons are going to be updated

   */

  void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)

  {

  	bool free_plinks;
  
  	/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
  	 * the mesh interface might be able to establish plinks with peers that

  	 * are already on the table but are not on PLINK_ESTAB state. However,
  	 * in general the mesh interface is not accepting peer link requests
  	 * from new peers, and that must be reflected in the beacon

  	 */
  	free_plinks = mesh_plink_availables(sdata);

  	if (free_plinks != sdata->u.mesh.accepting_plinks)
  		ieee80211_mesh_housekeeping_timer((unsigned long) sdata);

  }

  int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)

  {

  	int i;

  	sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
  	if (!sdata->u.mesh.rmc)

  		return -ENOMEM;

  	sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;

  	for (i = 0; i < RMC_BUCKETS; i++)

  		INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);

  	return 0;
  }

  void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)

  {

  	struct mesh_rmc *rmc = sdata->u.mesh.rmc;

  	struct rmc_entry *p, *n;
  	int i;

  	if (!sdata->u.mesh.rmc)

  		return;
  
  	for (i = 0; i < RMC_BUCKETS; i++)
  		list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
  			list_del(&p->list);
  			kmem_cache_free(rm_cache, p);
  		}
  
  	kfree(rmc);

  	sdata->u.mesh.rmc = NULL;

  }
  
  /**
   * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
   *
   * @sa:		source address
   * @mesh_hdr:	mesh_header
   *
   * Returns: 0 if the frame is not in the cache, nonzero otherwise.
   *
   * Checks using the source address and the mesh sequence number if we have
   * received this frame lately. If the frame is not in the cache, it is added to
   * it.
   */
  int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,

  		   struct ieee80211_sub_if_data *sdata)

  {

  	struct mesh_rmc *rmc = sdata->u.mesh.rmc;

  	u32 seqnum = 0;
  	int entries = 0;
  	u8 idx;
  	struct rmc_entry *p, *n;
  
  	/* Don't care about endianness since only match matters */

  	memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
  	idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;

  	list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
  		++entries;
  		if (time_after(jiffies, p->exp_time) ||
  				(entries == RMC_QUEUE_MAX_LEN)) {
  			list_del(&p->list);
  			kmem_cache_free(rm_cache, p);
  			--entries;

  		} else if ((seqnum == p->seqnum) &&
  			   (memcmp(sa, p->sa, ETH_ALEN) == 0))

  			return -1;
  	}
  
  	p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
  	if (!p) {
  		printk(KERN_DEBUG "o11s: could not allocate RMC entry
  ");
  		return 0;
  	}
  	p->seqnum = seqnum;
  	p->exp_time = jiffies + RMC_TIMEOUT;
  	memcpy(p->sa, sa, ETH_ALEN);
  	list_add(&p->list, &rmc->bucket[idx].list);
  	return 0;
  }

  void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)

  {

  	struct ieee80211_local *local = sdata->local;

  	struct ieee80211_supported_band *sband;
  	u8 *pos;
  	int len, i, rate;

  	u8 neighbors;

  
  	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
  	len = sband->n_bitrates;
  	if (len > 8)
  		len = 8;
  	pos = skb_put(skb, len + 2);
  	*pos++ = WLAN_EID_SUPP_RATES;
  	*pos++ = len;
  	for (i = 0; i < len; i++) {
  		rate = sband->bitrates[i].bitrate;
  		*pos++ = (u8) (rate / 5);
  	}
  
  	if (sband->n_bitrates > len) {
  		pos = skb_put(skb, sband->n_bitrates - len + 2);
  		*pos++ = WLAN_EID_EXT_SUPP_RATES;
  		*pos++ = sband->n_bitrates - len;
  		for (i = len; i < sband->n_bitrates; i++) {
  			rate = sband->bitrates[i].bitrate;
  			*pos++ = (u8) (rate / 5);
  		}
  	}

  	if (sband->band == IEEE80211_BAND_2GHZ) {
  		pos = skb_put(skb, 2 + 1);
  		*pos++ = WLAN_EID_DS_PARAMS;
  		*pos++ = 1;
  		*pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
  	}

  	pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);

  	*pos++ = WLAN_EID_MESH_ID;

  	*pos++ = sdata->u.mesh.mesh_id_len;
  	if (sdata->u.mesh.mesh_id_len)
  		memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);

  	pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));

  	*pos++ = WLAN_EID_MESH_CONFIG;

  	*pos++ = sizeof(struct ieee80211_meshconf_ie);

  
  	/* Active path selection protocol ID */

  	*pos++ = sdata->u.mesh.mesh_pp_id;

  
  	/* Active path selection metric ID   */

  	*pos++ = sdata->u.mesh.mesh_pm_id;

  
  	/* Congestion control mode identifier */

  	*pos++ = sdata->u.mesh.mesh_cc_id;

  	/* Synchronization protocol identifier */

  	*pos++ = sdata->u.mesh.mesh_sp_id;

  	/* Authentication Protocol identifier */

  	*pos++ = sdata->u.mesh.mesh_auth_id;

  	/* Mesh Formation Info - number of neighbors */
  	neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
  	/* Number of neighbor mesh STAs or 15 whichever is smaller */
  	neighbors = (neighbors > 15) ? 15 : neighbors;
  	*pos++ = neighbors << 1;

  	/* Mesh capability */

  	sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);

  	*pos = MESHCONF_CAPAB_FORWARDING;
  	*pos++ |= sdata->u.mesh.accepting_plinks ?
  	    MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;

  	*pos++ = 0x00;

  	if (sdata->u.mesh.ie) {
  		int len = sdata->u.mesh.ie_len;
  		const u8 *data = sdata->u.mesh.ie;

  		if (skb_tailroom(skb) > len)
  			memcpy(skb_put(skb, len), data, len);
  	}

  }

  
  static void ieee80211_mesh_path_timer(unsigned long data)
  {
  	struct ieee80211_sub_if_data *sdata =
  		(struct ieee80211_sub_if_data *) data;

  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

  	struct ieee80211_local *local = sdata->local;

  	if (local->quiescing) {
  		set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
  		return;
  	}

  	ieee80211_queue_work(&local->hw, &sdata->work);

  }

  static void ieee80211_mesh_path_root_timer(unsigned long data)
  {
  	struct ieee80211_sub_if_data *sdata =
  		(struct ieee80211_sub_if_data *) data;
  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  	struct ieee80211_local *local = sdata->local;
  
  	set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
  
  	if (local->quiescing) {
  		set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
  		return;
  	}

  	ieee80211_queue_work(&local->hw, &sdata->work);

  }

  void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
  {
  	if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
  		set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
  	else {
  		clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
  		/* stop running timer */
  		del_timer_sync(&ifmsh->mesh_path_root_timer);
  	}
  }

  /**

   * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
   * @hdr:    	802.11 frame header
   * @fc:		frame control field
   * @meshda:	destination address in the mesh
   * @meshsa:	source address address in the mesh.  Same as TA, as frame is
   *              locally originated.
   *
   * Return the length of the 802.11 (does not include a mesh control header)
   */

  int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
  				  const u8 *meshda, const u8 *meshsa)
  {

  	if (is_multicast_ether_addr(meshda)) {
  		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
  		/* DA TA SA */
  		memcpy(hdr->addr1, meshda, ETH_ALEN);
  		memcpy(hdr->addr2, meshsa, ETH_ALEN);
  		memcpy(hdr->addr3, meshsa, ETH_ALEN);
  		return 24;
  	} else {
  		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
  				IEEE80211_FCTL_TODS);
  		/* RA TA DA SA */
  		memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
  		memcpy(hdr->addr2, meshsa, ETH_ALEN);
  		memcpy(hdr->addr3, meshda, ETH_ALEN);
  		memcpy(hdr->addr4, meshsa, ETH_ALEN);
  		return 30;
  	}
  }
  
  /**

   * ieee80211_new_mesh_header - create a new mesh header
   * @meshhdr:    uninitialized mesh header
   * @sdata:	mesh interface to be used

   * @addr4or5:   1st address in the ae header, which may correspond to address 4
   *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
   *              be NULL.
   * @addr6:	2nd address in the ae header, which corresponds to addr6 of the
   *              mesh frame

   *
   * Return the header length.
   */
  int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,

  		struct ieee80211_sub_if_data *sdata, char *addr4or5,
  		char *addr6)

  {

  	int aelen = 0;

  	BUG_ON(!addr4or5 && addr6);

  	memset(meshhdr, 0, sizeof(*meshhdr));

  	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
  	put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
  	sdata->u.mesh.mesh_seqnum++;

  	if (addr4or5 && !addr6) {

  		meshhdr->flags |= MESH_FLAGS_AE_A4;
  		aelen += ETH_ALEN;

  		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
  	} else if (addr4or5 && addr6) {

  		meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
  		aelen += 2 * ETH_ALEN;

  		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
  		memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);

  	}
  	return 6 + aelen;

  }

  static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
  			   struct ieee80211_if_mesh *ifmsh)
  {
  	bool free_plinks;
  
  #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  	printk(KERN_DEBUG "%s: running mesh housekeeping
  ",

  	       sdata->name);

  #endif
  
  	ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
  	mesh_path_expire(sdata);
  
  	free_plinks = mesh_plink_availables(sdata);
  	if (free_plinks != sdata->u.mesh.accepting_plinks)

  		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);

  	mod_timer(&ifmsh->housekeeping_timer,
  		  round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
  }

  static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  
  	mesh_path_tx_root_frame(sdata);
  	mod_timer(&ifmsh->mesh_path_root_timer,
  		  round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
  }

  #ifdef CONFIG_PM
  void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

  	/* use atomic bitops in case both timers fire at the same time */
  
  	if (del_timer_sync(&ifmsh->housekeeping_timer))
  		set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  	if (del_timer_sync(&ifmsh->mesh_path_timer))
  		set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);

  	if (del_timer_sync(&ifmsh->mesh_path_root_timer))
  		set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);

  }
  
  void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  
  	if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
  		add_timer(&ifmsh->housekeeping_timer);
  	if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
  		add_timer(&ifmsh->mesh_path_timer);

  	if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
  		add_timer(&ifmsh->mesh_path_root_timer);

  	ieee80211_mesh_root_setup(ifmsh);

  }
  #endif

  
  void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  	struct ieee80211_local *local = sdata->local;

  	local->fif_other_bss++;
  	/* mesh ifaces must set allmulti to forward mcast traffic */
  	atomic_inc(&local->iff_allmultis);
  	ieee80211_configure_filter(local);

  	ifmsh->mesh_cc_id = 0;	/* Disabled */
  	ifmsh->mesh_sp_id = 0;	/* Neighbor Offset */
  	ifmsh->mesh_auth_id = 0;	/* Disabled */

  	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);

  	ieee80211_mesh_root_setup(ifmsh);

  	ieee80211_queue_work(&local->hw, &sdata->work);

  	sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;

  	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |

  						BSS_CHANGED_BEACON_ENABLED |
  						BSS_CHANGED_BEACON_INT);

  }
  
  void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
  {

  	struct ieee80211_local *local = sdata->local;

  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  
  	ifmsh->mesh_id_len = 0;
  	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
  	sta_info_flush(local, NULL);

  	del_timer_sync(&sdata->u.mesh.housekeeping_timer);

  	del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);

  	/*

  	 * If the timer fired while we waited for it, it will have
  	 * requeued the work. Now the work will be running again
  	 * but will not rearm the timer again because it checks
  	 * whether the interface is running, which, at this point,
  	 * it no longer is.
  	 */

  	cancel_work_sync(&sdata->work);

  
  	local->fif_other_bss--;
  	atomic_dec(&local->iff_allmultis);
  	ieee80211_configure_filter(local);

  }
  
  static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
  					u16 stype,
  					struct ieee80211_mgmt *mgmt,
  					size_t len,
  					struct ieee80211_rx_status *rx_status)
  {

  	struct ieee80211_local *local = sdata->local;

  	struct ieee802_11_elems elems;
  	struct ieee80211_channel *channel;

  	u32 supp_rates = 0;

  	size_t baselen;
  	int freq;
  	enum ieee80211_band band = rx_status->band;
  
  	/* ignore ProbeResp to foreign address */
  	if (stype == IEEE80211_STYPE_PROBE_RESP &&

  	    compare_ether_addr(mgmt->da, sdata->vif.addr))

  		return;
  
  	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
  	if (baselen > len)
  		return;
  
  	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
  			       &elems);

  	/* ignore beacons from secure mesh peers if our security is off */

  	if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)

  		return;

  	if (elems.ds_params && elems.ds_params_len == 1)

  		freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);

  	else
  		freq = rx_status->freq;
  
  	channel = ieee80211_get_channel(local->hw.wiphy, freq);
  
  	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
  		return;
  
  	if (elems.mesh_id && elems.mesh_config &&
  	    mesh_matches_local(&elems, sdata)) {
  		supp_rates = ieee80211_sta_get_rates(local, &elems, band);

  		mesh_neighbour_update(mgmt->sa, supp_rates, sdata, &elems);

  	}
  }
  
  static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
  					  struct ieee80211_mgmt *mgmt,
  					  size_t len,
  					  struct ieee80211_rx_status *rx_status)
  {
  	switch (mgmt->u.action.category) {

  	case WLAN_CATEGORY_MESH_ACTION:

  		mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
  		break;

  	case WLAN_CATEGORY_MESH_PATH_SEL:

  		mesh_rx_path_sel_frame(sdata, mgmt, len);
  		break;
  	}
  }

  void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
  				   struct sk_buff *skb)

  {
  	struct ieee80211_rx_status *rx_status;

  	struct ieee80211_mgmt *mgmt;
  	u16 stype;

  	rx_status = IEEE80211_SKB_RXCB(skb);

  	mgmt = (struct ieee80211_mgmt *) skb->data;
  	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
  
  	switch (stype) {
  	case IEEE80211_STYPE_PROBE_RESP:
  	case IEEE80211_STYPE_BEACON:
  		ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
  					    rx_status);
  		break;
  	case IEEE80211_STYPE_ACTION:
  		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
  		break;
  	}

  }

  void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)

  {

  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

  
  	if (ifmsh->preq_queue_len &&
  	    time_after(jiffies,
  		       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
  		mesh_path_start_discovery(sdata);

  	if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
  		mesh_mpath_table_grow();

  	if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))

  		mesh_mpp_table_grow();
  
  	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))

  		ieee80211_mesh_housekeeping(sdata, ifmsh);

  
  	if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
  		ieee80211_mesh_rootpath(sdata);

  }
  
  void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
  {
  	struct ieee80211_sub_if_data *sdata;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(sdata, &local->interfaces, list)
  		if (ieee80211_vif_is_mesh(&sdata->vif))

  			ieee80211_queue_work(&local->hw, &sdata->work);

  	rcu_read_unlock();
  }

  void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
  {

  	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

  	setup_timer(&ifmsh->housekeeping_timer,
  		    ieee80211_mesh_housekeeping_timer,
  		    (unsigned long) sdata);

  	ifmsh->accepting_plinks = true;
  	ifmsh->preq_id = 0;

  	ifmsh->sn = 0;

  	atomic_set(&ifmsh->mpaths, 0);

  	mesh_rmc_init(sdata);

  	ifmsh->last_preq = jiffies;

  	/* Allocate all mesh structures when creating the first mesh interface. */
  	if (!mesh_allocated)
  		ieee80211s_init();

  	setup_timer(&ifmsh->mesh_path_timer,

  		    ieee80211_mesh_path_timer,
  		    (unsigned long) sdata);

  	setup_timer(&ifmsh->mesh_path_root_timer,
  		    ieee80211_mesh_path_root_timer,
  		    (unsigned long) sdata);

  	INIT_LIST_HEAD(&ifmsh->preq_queue.list);
  	spin_lock_init(&ifmsh->mesh_preq_queue_lock);
  }