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ieee80211.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 *
 * 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 <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/rtnetlink.h>
#include <linux/bitmap.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>

#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "wep.h"
#include "wme.h"
#include "aes_ccm.h"
#include "ieee80211_led.h"
#include "cfg.h"
#include "debugfs.h"
#include "debugfs_netdev.h"

/*
 * For seeing transmitted packets on monitor interfaces
 * we have a radiotap header too.
 */
struct ieee80211_tx_status_rtap_hdr {
      struct ieee80211_radiotap_header hdr;
      __le16 tx_flags;
      u8 data_retries;
} __attribute__ ((packed));

/* common interface routines */

static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
{
      memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
      return ETH_ALEN;
}

/* must be called under mdev tx lock */
static void ieee80211_configure_filter(struct ieee80211_local *local)
{
      unsigned int changed_flags;
      unsigned int new_flags = 0;

      if (atomic_read(&local->iff_promiscs))
            new_flags |= FIF_PROMISC_IN_BSS;

      if (atomic_read(&local->iff_allmultis))
            new_flags |= FIF_ALLMULTI;

      if (local->monitors)
            new_flags |= FIF_CONTROL |
                       FIF_OTHER_BSS |
                       FIF_BCN_PRBRESP_PROMISC;

      changed_flags = local->filter_flags ^ new_flags;

      /* be a bit nasty */
      new_flags |= (1<<31);

      local->ops->configure_filter(local_to_hw(local),
                             changed_flags, &new_flags,
                             local->mdev->mc_count,
                             local->mdev->mc_list);

      WARN_ON(new_flags & (1<<31));

      local->filter_flags = new_flags & ~(1<<31);
}

/* master interface */

static int ieee80211_master_open(struct net_device *dev)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_sub_if_data *sdata;
      int res = -EOPNOTSUPP;

      /* we hold the RTNL here so can safely walk the list */
      list_for_each_entry(sdata, &local->interfaces, list) {
            if (sdata->dev != dev && netif_running(sdata->dev)) {
                  res = 0;
                  break;
            }
      }
      return res;
}

static int ieee80211_master_stop(struct net_device *dev)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_sub_if_data *sdata;

      /* we hold the RTNL here so can safely walk the list */
      list_for_each_entry(sdata, &local->interfaces, list)
            if (sdata->dev != dev && netif_running(sdata->dev))
                  dev_close(sdata->dev);

      return 0;
}

static void ieee80211_master_set_multicast_list(struct net_device *dev)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

      ieee80211_configure_filter(local);
}

/* regular interfaces */

static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
      /* FIX: what would be proper limits for MTU?
       * This interface uses 802.3 frames. */
      if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
            printk(KERN_WARNING "%s: invalid MTU %d\n",
                   dev->name, new_mtu);
            return -EINVAL;
      }

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
      printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
      dev->mtu = new_mtu;
      return 0;
}

static inline int identical_mac_addr_allowed(int type1, int type2)
{
      return (type1 == IEEE80211_IF_TYPE_MNTR ||
            type2 == IEEE80211_IF_TYPE_MNTR ||
            (type1 == IEEE80211_IF_TYPE_AP &&
             type2 == IEEE80211_IF_TYPE_WDS) ||
            (type1 == IEEE80211_IF_TYPE_WDS &&
             (type2 == IEEE80211_IF_TYPE_WDS ||
              type2 == IEEE80211_IF_TYPE_AP)) ||
            (type1 == IEEE80211_IF_TYPE_AP &&
             type2 == IEEE80211_IF_TYPE_VLAN) ||
            (type1 == IEEE80211_IF_TYPE_VLAN &&
             (type2 == IEEE80211_IF_TYPE_AP ||
              type2 == IEEE80211_IF_TYPE_VLAN)));
}

static int ieee80211_open(struct net_device *dev)
{
      struct ieee80211_sub_if_data *sdata, *nsdata;
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_if_init_conf conf;
      int res;

      sdata = IEEE80211_DEV_TO_SUB_IF(dev);

      /* we hold the RTNL here so can safely walk the list */
      list_for_each_entry(nsdata, &local->interfaces, list) {
            struct net_device *ndev = nsdata->dev;

            if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
                compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
                  /*
                   * check whether it may have the same address
                   */
                  if (!identical_mac_addr_allowed(sdata->type,
                                          nsdata->type))
                        return -ENOTUNIQ;

                  /*
                   * can only add VLANs to enabled APs
                   */
                  if (sdata->type == IEEE80211_IF_TYPE_VLAN &&
                      nsdata->type == IEEE80211_IF_TYPE_AP &&
                      netif_running(nsdata->dev))
                        sdata->u.vlan.ap = nsdata;
            }
      }

      switch (sdata->type) {
      case IEEE80211_IF_TYPE_WDS:
            if (is_zero_ether_addr(sdata->u.wds.remote_addr))
                  return -ENOLINK;
            break;
      case IEEE80211_IF_TYPE_VLAN:
            if (!sdata->u.vlan.ap)
                  return -ENOLINK;
            break;
      case IEEE80211_IF_TYPE_AP:
      case IEEE80211_IF_TYPE_STA:
      case IEEE80211_IF_TYPE_MNTR:
      case IEEE80211_IF_TYPE_IBSS:
            /* no special treatment */
            break;
      case IEEE80211_IF_TYPE_INVALID:
            /* cannot happen */
            WARN_ON(1);
            break;
      }

      if (local->open_count == 0) {
            res = 0;
            if (local->ops->start)
                  res = local->ops->start(local_to_hw(local));
            if (res)
                  return res;
            ieee80211_hw_config(local);
      }

      switch (sdata->type) {
      case IEEE80211_IF_TYPE_VLAN:
            list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
            /* no need to tell driver */
            break;
      case IEEE80211_IF_TYPE_MNTR:
            /* must be before the call to ieee80211_configure_filter */
            local->monitors++;
            if (local->monitors == 1) {
                  netif_tx_lock_bh(local->mdev);
                  ieee80211_configure_filter(local);
                  netif_tx_unlock_bh(local->mdev);

                  local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
            }
            break;
      case IEEE80211_IF_TYPE_STA:
      case IEEE80211_IF_TYPE_IBSS:
            sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
            /* fall through */
      default:
            conf.if_id = dev->ifindex;
            conf.type = sdata->type;
            conf.mac_addr = dev->dev_addr;
            res = local->ops->add_interface(local_to_hw(local), &conf);
            if (res && !local->open_count && local->ops->stop)
                  local->ops->stop(local_to_hw(local));
            if (res)
                  return res;

            ieee80211_if_config(dev);
            ieee80211_reset_erp_info(dev);
            ieee80211_enable_keys(sdata);

            if (sdata->type == IEEE80211_IF_TYPE_STA &&
                !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
                  netif_carrier_off(dev);
            else
                  netif_carrier_on(dev);
      }

      if (local->open_count == 0) {
            res = dev_open(local->mdev);
            WARN_ON(res);
            tasklet_enable(&local->tx_pending_tasklet);
            tasklet_enable(&local->tasklet);
      }

      /*
       * set_multicast_list will be invoked by the networking core
       * which will check whether any increments here were done in
       * error and sync them down to the hardware as filter flags.
       */
      if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
            atomic_inc(&local->iff_allmultis);

      if (sdata->flags & IEEE80211_SDATA_PROMISC)
            atomic_inc(&local->iff_promiscs);

      local->open_count++;

      netif_start_queue(dev);

      return 0;
}

static int ieee80211_stop(struct net_device *dev)
{
      struct ieee80211_sub_if_data *sdata;
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_if_init_conf conf;

      sdata = IEEE80211_DEV_TO_SUB_IF(dev);

      netif_stop_queue(dev);

      /*
       * Don't count this interface for promisc/allmulti while it
       * is down. dev_mc_unsync() will invoke set_multicast_list
       * on the master interface which will sync these down to the
       * hardware as filter flags.
       */
      if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
            atomic_dec(&local->iff_allmultis);

      if (sdata->flags & IEEE80211_SDATA_PROMISC)
            atomic_dec(&local->iff_promiscs);

      dev_mc_unsync(local->mdev, dev);

      /* down all dependent devices, that is VLANs */
      if (sdata->type == IEEE80211_IF_TYPE_AP) {
            struct ieee80211_sub_if_data *vlan, *tmp;

            list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
                               u.vlan.list)
                  dev_close(vlan->dev);
            WARN_ON(!list_empty(&sdata->u.ap.vlans));
      }

      local->open_count--;

      switch (sdata->type) {
      case IEEE80211_IF_TYPE_VLAN:
            list_del(&sdata->u.vlan.list);
            sdata->u.vlan.ap = NULL;
            /* no need to tell driver */
            break;
      case IEEE80211_IF_TYPE_MNTR:
            local->monitors--;
            if (local->monitors == 0) {
                  netif_tx_lock_bh(local->mdev);
                  ieee80211_configure_filter(local);
                  netif_tx_unlock_bh(local->mdev);

                  local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
            }
            break;
      case IEEE80211_IF_TYPE_STA:
      case IEEE80211_IF_TYPE_IBSS:
            sdata->u.sta.state = IEEE80211_DISABLED;
            del_timer_sync(&sdata->u.sta.timer);
            /*
             * When we get here, the interface is marked down.
             * Call synchronize_rcu() to wait for the RX path
             * should it be using the interface and enqueuing
             * frames at this very time on another CPU.
             */
            synchronize_rcu();
            skb_queue_purge(&sdata->u.sta.skb_queue);

            if (!local->ops->hw_scan &&
                local->scan_dev == sdata->dev) {
                  local->sta_scanning = 0;
                  cancel_delayed_work(&local->scan_work);
            }
            flush_workqueue(local->hw.workqueue);

            sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
            kfree(sdata->u.sta.extra_ie);
            sdata->u.sta.extra_ie = NULL;
            sdata->u.sta.extra_ie_len = 0;
            /* fall through */
      default:
            conf.if_id = dev->ifindex;
            conf.type = sdata->type;
            conf.mac_addr = dev->dev_addr;
            /* disable all keys for as long as this netdev is down */
            ieee80211_disable_keys(sdata);
            local->ops->remove_interface(local_to_hw(local), &conf);
      }

      if (local->open_count == 0) {
            if (netif_running(local->mdev))
                  dev_close(local->mdev);

            if (local->ops->stop)
                  local->ops->stop(local_to_hw(local));

            tasklet_disable(&local->tx_pending_tasklet);
            tasklet_disable(&local->tasklet);
      }

      return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
      int allmulti, promisc, sdata_allmulti, sdata_promisc;

      allmulti = !!(dev->flags & IFF_ALLMULTI);
      promisc = !!(dev->flags & IFF_PROMISC);
      sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
      sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);

      if (allmulti != sdata_allmulti) {
            if (dev->flags & IFF_ALLMULTI)
                  atomic_inc(&local->iff_allmultis);
            else
                  atomic_dec(&local->iff_allmultis);
            sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
      }

      if (promisc != sdata_promisc) {
            if (dev->flags & IFF_PROMISC)
                  atomic_inc(&local->iff_promiscs);
            else
                  atomic_dec(&local->iff_promiscs);
            sdata->flags ^= IEEE80211_SDATA_PROMISC;
      }

      dev_mc_sync(local->mdev, dev);
}

static const struct header_ops ieee80211_header_ops = {
      .create           = eth_header,
      .parse            = header_parse_80211,
      .rebuild    = eth_rebuild_header,
      .cache            = eth_header_cache,
      .cache_update     = eth_header_cache_update,
};

/* Must not be called for mdev */
void ieee80211_if_setup(struct net_device *dev)
{
      ether_setup(dev);
      dev->hard_start_xmit = ieee80211_subif_start_xmit;
      dev->wireless_handlers = &ieee80211_iw_handler_def;
      dev->set_multicast_list = ieee80211_set_multicast_list;
      dev->change_mtu = ieee80211_change_mtu;
      dev->open = ieee80211_open;
      dev->stop = ieee80211_stop;
      dev->destructor = ieee80211_if_free;
}

/* WDS specialties */

int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
      struct sta_info *sta;
      DECLARE_MAC_BUF(mac);

      if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
            return 0;

      /* Create STA entry for the new peer */
      sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
      if (!sta)
            return -ENOMEM;
      sta_info_put(sta);

      /* Remove STA entry for the old peer */
      sta = sta_info_get(local, sdata->u.wds.remote_addr);
      if (sta) {
            sta_info_free(sta);
            sta_info_put(sta);
      } else {
            printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
                   "peer %s\n",
                   dev->name, print_mac(mac, sdata->u.wds.remote_addr));
      }

      /* Update WDS link data */
      memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);

      return 0;
}

/* everything else */

static int __ieee80211_if_config(struct net_device *dev,
                         struct sk_buff *beacon,
                         struct ieee80211_tx_control *control)
{
      struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_if_conf conf;

      if (!local->ops->config_interface || !netif_running(dev))
            return 0;

      memset(&conf, 0, sizeof(conf));
      conf.type = sdata->type;
      if (sdata->type == IEEE80211_IF_TYPE_STA ||
          sdata->type == IEEE80211_IF_TYPE_IBSS) {
            conf.bssid = sdata->u.sta.bssid;
            conf.ssid = sdata->u.sta.ssid;
            conf.ssid_len = sdata->u.sta.ssid_len;
      } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
            conf.ssid = sdata->u.ap.ssid;
            conf.ssid_len = sdata->u.ap.ssid_len;
            conf.beacon = beacon;
            conf.beacon_control = control;
      }
      return local->ops->config_interface(local_to_hw(local),
                                 dev->ifindex, &conf);
}

int ieee80211_if_config(struct net_device *dev)
{
      return __ieee80211_if_config(dev, NULL, NULL);
}

int ieee80211_if_config_beacon(struct net_device *dev)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_tx_control control;
      struct sk_buff *skb;

      if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
            return 0;
      skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
      if (!skb)
            return -ENOMEM;
      return __ieee80211_if_config(dev, skb, &control);
}

int ieee80211_hw_config(struct ieee80211_local *local)
{
      struct ieee80211_hw_mode *mode;
      struct ieee80211_channel *chan;
      int ret = 0;

      if (local->sta_scanning) {
            chan = local->scan_channel;
            mode = local->scan_hw_mode;
      } else {
            chan = local->oper_channel;
            mode = local->oper_hw_mode;
      }

      local->hw.conf.channel = chan->chan;
      local->hw.conf.channel_val = chan->val;
      if (!local->hw.conf.power_level) {
            local->hw.conf.power_level = chan->power_level;
      } else {
            local->hw.conf.power_level = min(chan->power_level,
                                     local->hw.conf.power_level);
      }
      local->hw.conf.freq = chan->freq;
      local->hw.conf.phymode = mode->mode;
      local->hw.conf.antenna_max = chan->antenna_max;
      local->hw.conf.chan = chan;
      local->hw.conf.mode = mode;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
      printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
             "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
             local->hw.conf.phymode);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */

      if (local->open_count)
            ret = local->ops->config(local_to_hw(local), &local->hw.conf);

      return ret;
}

void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
{
      struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
      struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
      if (local->ops->erp_ie_changed)
            local->ops->erp_ie_changed(local_to_hw(local), changes,
                  !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
                  !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
}

void ieee80211_reset_erp_info(struct net_device *dev)
{
      struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

      sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
                  IEEE80211_SDATA_SHORT_PREAMBLE);
      ieee80211_erp_info_change_notify(dev,
                               IEEE80211_ERP_CHANGE_PROTECTION |
                               IEEE80211_ERP_CHANGE_PREAMBLE);
}

void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
                         struct sk_buff *skb,
                         struct ieee80211_tx_status *status)
{
      struct ieee80211_local *local = hw_to_local(hw);
      struct ieee80211_tx_status *saved;
      int tmp;

      skb->dev = local->mdev;
      saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
      if (unlikely(!saved)) {
            if (net_ratelimit())
                  printk(KERN_WARNING "%s: Not enough memory, "
                         "dropping tx status", skb->dev->name);
            /* should be dev_kfree_skb_irq, but due to this function being
             * named _irqsafe instead of just _irq we can't be sure that
             * people won't call it from non-irq contexts */
            dev_kfree_skb_any(skb);
            return;
      }
      memcpy(saved, status, sizeof(struct ieee80211_tx_status));
      /* copy pointer to saved status into skb->cb for use by tasklet */
      memcpy(skb->cb, &saved, sizeof(saved));

      skb->pkt_type = IEEE80211_TX_STATUS_MSG;
      skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
                   &local->skb_queue : &local->skb_queue_unreliable, skb);
      tmp = skb_queue_len(&local->skb_queue) +
            skb_queue_len(&local->skb_queue_unreliable);
      while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
             (skb = skb_dequeue(&local->skb_queue_unreliable))) {
            memcpy(&saved, skb->cb, sizeof(saved));
            kfree(saved);
            dev_kfree_skb_irq(skb);
            tmp--;
            I802_DEBUG_INC(local->tx_status_drop);
      }
      tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);

static void ieee80211_tasklet_handler(unsigned long data)
{
      struct ieee80211_local *local = (struct ieee80211_local *) data;
      struct sk_buff *skb;
      struct ieee80211_rx_status rx_status;
      struct ieee80211_tx_status *tx_status;

      while ((skb = skb_dequeue(&local->skb_queue)) ||
             (skb = skb_dequeue(&local->skb_queue_unreliable))) {
            switch (skb->pkt_type) {
            case IEEE80211_RX_MSG:
                  /* status is in skb->cb */
                  memcpy(&rx_status, skb->cb, sizeof(rx_status));
                  /* Clear skb->type in order to not confuse kernel
                   * netstack. */
                  skb->pkt_type = 0;
                  __ieee80211_rx(local_to_hw(local), skb, &rx_status);
                  break;
            case IEEE80211_TX_STATUS_MSG:
                  /* get pointer to saved status out of skb->cb */
                  memcpy(&tx_status, skb->cb, sizeof(tx_status));
                  skb->pkt_type = 0;
                  ieee80211_tx_status(local_to_hw(local),
                                  skb, tx_status);
                  kfree(tx_status);
                  break;
            default: /* should never get here! */
                  printk(KERN_ERR "%s: Unknown message type (%d)\n",
                         wiphy_name(local->hw.wiphy), skb->pkt_type);
                  dev_kfree_skb(skb);
                  break;
            }
      }
}

/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 * make a prepared TX frame (one that has been given to hw) to look like brand
 * new IEEE 802.11 frame that is ready to go through TX processing again.
 * Also, tx_packet_data in cb is restored from tx_control. */
static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
                              struct ieee80211_key *key,
                              struct sk_buff *skb,
                              struct ieee80211_tx_control *control)
{
      int hdrlen, iv_len, mic_len;
      struct ieee80211_tx_packet_data *pkt_data;

      pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
      pkt_data->ifindex = control->ifindex;
      pkt_data->flags = 0;
      if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
            pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
      if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
            pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
      if (control->flags & IEEE80211_TXCTL_REQUEUE)
            pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
      pkt_data->queue = control->queue;

      hdrlen = ieee80211_get_hdrlen_from_skb(skb);

      if (!key)
            goto no_key;

      switch (key->conf.alg) {
      case ALG_WEP:
            iv_len = WEP_IV_LEN;
            mic_len = WEP_ICV_LEN;
            break;
      case ALG_TKIP:
            iv_len = TKIP_IV_LEN;
            mic_len = TKIP_ICV_LEN;
            break;
      case ALG_CCMP:
            iv_len = CCMP_HDR_LEN;
            mic_len = CCMP_MIC_LEN;
            break;
      default:
            goto no_key;
      }

      if (skb->len >= mic_len &&
          !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
            skb_trim(skb, skb->len - mic_len);
      if (skb->len >= iv_len && skb->len > hdrlen) {
            memmove(skb->data + iv_len, skb->data, hdrlen);
            skb_pull(skb, iv_len);
      }

no_key:
      {
            struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
            u16 fc = le16_to_cpu(hdr->frame_control);
            if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
                  fc &= ~IEEE80211_STYPE_QOS_DATA;
                  hdr->frame_control = cpu_to_le16(fc);
                  memmove(skb->data + 2, skb->data, hdrlen - 2);
                  skb_pull(skb, 2);
            }
      }
}

void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
                   struct ieee80211_tx_status *status)
{
      struct sk_buff *skb2;
      struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
      struct ieee80211_local *local = hw_to_local(hw);
      u16 frag, type;
      struct ieee80211_tx_status_rtap_hdr *rthdr;
      struct ieee80211_sub_if_data *sdata;
      int monitors;

      if (!status) {
            printk(KERN_ERR
                   "%s: ieee80211_tx_status called with NULL status\n",
                   wiphy_name(local->hw.wiphy));
            dev_kfree_skb(skb);
            return;
      }

      if (status->excessive_retries) {
            struct sta_info *sta;
            sta = sta_info_get(local, hdr->addr1);
            if (sta) {
                  if (sta->flags & WLAN_STA_PS) {
                        /* The STA is in power save mode, so assume
                         * that this TX packet failed because of that.
                         */
                        status->excessive_retries = 0;
                        status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
                  }
                  sta_info_put(sta);
            }
      }

      if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
            struct sta_info *sta;
            sta = sta_info_get(local, hdr->addr1);
            if (sta) {
                  sta->tx_filtered_count++;

                  /* Clear the TX filter mask for this STA when sending
                   * the next packet. If the STA went to power save mode,
                   * this will happen when it is waking up for the next
                   * time. */
                  sta->clear_dst_mask = 1;

                  /* TODO: Is the WLAN_STA_PS flag always set here or is
                   * the race between RX and TX status causing some
                   * packets to be filtered out before 80211.o gets an
                   * update for PS status? This seems to be the case, so
                   * no changes are likely to be needed. */
                  if (sta->flags & WLAN_STA_PS &&
                      skb_queue_len(&sta->tx_filtered) <
                      STA_MAX_TX_BUFFER) {
                        ieee80211_remove_tx_extra(local, sta->key,
                                            skb,
                                            &status->control);
                        skb_queue_tail(&sta->tx_filtered, skb);
                  } else if (!(sta->flags & WLAN_STA_PS) &&
                           !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
                        /* Software retry the packet once */
                        status->control.flags |= IEEE80211_TXCTL_REQUEUE;
                        ieee80211_remove_tx_extra(local, sta->key,
                                            skb,
                                            &status->control);
                        dev_queue_xmit(skb);
                  } else {
                        if (net_ratelimit()) {
                              printk(KERN_DEBUG "%s: dropped TX "
                                     "filtered frame queue_len=%d "
                                     "PS=%d @%lu\n",
                                     wiphy_name(local->hw.wiphy),
                                     skb_queue_len(
                                           &sta->tx_filtered),
                                     !!(sta->flags & WLAN_STA_PS),
                                     jiffies);
                        }
                        dev_kfree_skb(skb);
                  }
                  sta_info_put(sta);
                  return;
            }
      } else {
            /* FIXME: STUPID to call this with both local and local->mdev */
            rate_control_tx_status(local, local->mdev, skb, status);
      }

      ieee80211_led_tx(local, 0);

      /* SNMP counters
       * Fragments are passed to low-level drivers as separate skbs, so these
       * are actually fragments, not frames. Update frame counters only for
       * the first fragment of the frame. */

      frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
      type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;

      if (status->flags & IEEE80211_TX_STATUS_ACK) {
            if (frag == 0) {
                  local->dot11TransmittedFrameCount++;
                  if (is_multicast_ether_addr(hdr->addr1))
                        local->dot11MulticastTransmittedFrameCount++;
                  if (status->retry_count > 0)
                        local->dot11RetryCount++;
                  if (status->retry_count > 1)
                        local->dot11MultipleRetryCount++;
            }

            /* This counter shall be incremented for an acknowledged MPDU
             * with an individual address in the address 1 field or an MPDU
             * with a multicast address in the address 1 field of type Data
             * or Management. */
            if (!is_multicast_ether_addr(hdr->addr1) ||
                type == IEEE80211_FTYPE_DATA ||
                type == IEEE80211_FTYPE_MGMT)
                  local->dot11TransmittedFragmentCount++;
      } else {
            if (frag == 0)
                  local->dot11FailedCount++;
      }

      /* this was a transmitted frame, but now we want to reuse it */
      skb_orphan(skb);

      if (!local->monitors) {
            dev_kfree_skb(skb);
            return;
      }

      /* send frame to monitor interfaces now */

      if (skb_headroom(skb) < sizeof(*rthdr)) {
            printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
            dev_kfree_skb(skb);
            return;
      }

      rthdr = (struct ieee80211_tx_status_rtap_hdr*)
                        skb_push(skb, sizeof(*rthdr));

      memset(rthdr, 0, sizeof(*rthdr));
      rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
      rthdr->hdr.it_present =
            cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
                      (1 << IEEE80211_RADIOTAP_DATA_RETRIES));

      if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
          !is_multicast_ether_addr(hdr->addr1))
            rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);

      if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
          (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
            rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
      else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
            rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);

      rthdr->data_retries = status->retry_count;

      rcu_read_lock();
      monitors = local->monitors;
      list_for_each_entry_rcu(sdata, &local->interfaces, list) {
            /*
             * Using the monitors counter is possibly racy, but
             * if the value is wrong we simply either clone the skb
             * once too much or forget sending it to one monitor iface
             * The latter case isn't nice but fixing the race is much
             * more complicated.
             */
            if (!monitors || !skb)
                  goto out;

            if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
                  if (!netif_running(sdata->dev))
                        continue;
                  monitors--;
                  if (monitors)
                        skb2 = skb_clone(skb, GFP_ATOMIC);
                  else
                        skb2 = NULL;
                  skb->dev = sdata->dev;
                  /* XXX: is this sufficient for BPF? */
                  skb_set_mac_header(skb, 0);
                  skb->ip_summed = CHECKSUM_UNNECESSARY;
                  skb->pkt_type = PACKET_OTHERHOST;
                  skb->protocol = htons(ETH_P_802_2);
                  memset(skb->cb, 0, sizeof(skb->cb));
                  netif_rx(skb);
                  skb = skb2;
            }
      }
 out:
      rcu_read_unlock();
      if (skb)
            dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_tx_status);

struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
                              const struct ieee80211_ops *ops)
{
      struct net_device *mdev;
      struct ieee80211_local *local;
      struct ieee80211_sub_if_data *sdata;
      int priv_size;
      struct wiphy *wiphy;

      /* Ensure 32-byte alignment of our private data and hw private data.
       * We use the wiphy priv data for both our ieee80211_local and for
       * the driver's private data
       *
       * In memory it'll be like this:
       *
       * +-------------------------+
       * | struct wiphy     |
       * +-------------------------+
       * | struct ieee80211_local  |
       * +-------------------------+
       * | driver's private data   |
       * +-------------------------+
       *
       */
      priv_size = ((sizeof(struct ieee80211_local) +
                  NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
                priv_data_len;

      wiphy = wiphy_new(&mac80211_config_ops, priv_size);

      if (!wiphy)
            return NULL;

      wiphy->privid = mac80211_wiphy_privid;

      local = wiphy_priv(wiphy);
      local->hw.wiphy = wiphy;

      local->hw.priv = (char *)local +
                   ((sizeof(struct ieee80211_local) +
                     NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);

      BUG_ON(!ops->tx);
      BUG_ON(!ops->start);
      BUG_ON(!ops->stop);
      BUG_ON(!ops->config);
      BUG_ON(!ops->add_interface);
      BUG_ON(!ops->remove_interface);
      BUG_ON(!ops->configure_filter);
      local->ops = ops;

      /* for now, mdev needs sub_if_data :/ */
      mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
                      "wmaster%d", ether_setup);
      if (!mdev) {
            wiphy_free(wiphy);
            return NULL;
      }

      sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
      mdev->ieee80211_ptr = &sdata->wdev;
      sdata->wdev.wiphy = wiphy;

      local->hw.queues = 1; /* default */

      local->mdev = mdev;
      local->rx_pre_handlers = ieee80211_rx_pre_handlers;
      local->rx_handlers = ieee80211_rx_handlers;
      local->tx_handlers = ieee80211_tx_handlers;

      local->bridge_packets = 1;

      local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
      local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
      local->short_retry_limit = 7;
      local->long_retry_limit = 4;
      local->hw.conf.radio_enabled = 1;

      local->enabled_modes = ~0;

      INIT_LIST_HEAD(&local->modes_list);

      INIT_LIST_HEAD(&local->interfaces);

      INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
      ieee80211_rx_bss_list_init(mdev);

      sta_info_init(local);

      mdev->hard_start_xmit = ieee80211_master_start_xmit;
      mdev->open = ieee80211_master_open;
      mdev->stop = ieee80211_master_stop;
      mdev->type = ARPHRD_IEEE80211;
      mdev->header_ops = &ieee80211_header_ops;
      mdev->set_multicast_list = ieee80211_master_set_multicast_list;

      sdata->type = IEEE80211_IF_TYPE_AP;
      sdata->dev = mdev;
      sdata->local = local;
      sdata->u.ap.force_unicast_rateidx = -1;
      sdata->u.ap.max_ratectrl_rateidx = -1;
      ieee80211_if_sdata_init(sdata);
      /* no RCU needed since we're still during init phase */
      list_add_tail(&sdata->list, &local->interfaces);

      tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
                 (unsigned long)local);
      tasklet_disable(&local->tx_pending_tasklet);

      tasklet_init(&local->tasklet,
                 ieee80211_tasklet_handler,
                 (unsigned long) local);
      tasklet_disable(&local->tasklet);

      skb_queue_head_init(&local->skb_queue);
      skb_queue_head_init(&local->skb_queue_unreliable);

      return local_to_hw(local);
}
EXPORT_SYMBOL(ieee80211_alloc_hw);

int ieee80211_register_hw(struct ieee80211_hw *hw)
{
      struct ieee80211_local *local = hw_to_local(hw);
      const char *name;
      int result;

      result = wiphy_register(local->hw.wiphy);
      if (result < 0)
            return result;

      name = wiphy_dev(local->hw.wiphy)->driver->name;
      local->hw.workqueue = create_singlethread_workqueue(name);
      if (!local->hw.workqueue) {
            result = -ENOMEM;
            goto fail_workqueue;
      }

      /*
       * The hardware needs headroom for sending the frame,
       * and we need some headroom for passing the frame to monitor
       * interfaces, but never both at the same time.
       */
      local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
                           sizeof(struct ieee80211_tx_status_rtap_hdr));

      debugfs_hw_add(local);

      local->hw.conf.beacon_int = 1000;

      local->wstats_flags |= local->hw.max_rssi ?
                         IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
      local->wstats_flags |= local->hw.max_signal ?
                         IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
      local->wstats_flags |= local->hw.max_noise ?
                         IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
      if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
            local->wstats_flags |= IW_QUAL_DBM;

      result = sta_info_start(local);
      if (result < 0)
            goto fail_sta_info;

      rtnl_lock();
      result = dev_alloc_name(local->mdev, local->mdev->name);
      if (result < 0)
            goto fail_dev;

      memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
      SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));

      result = register_netdevice(local->mdev);
      if (result < 0)
            goto fail_dev;

      ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
      ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);

      result = ieee80211_init_rate_ctrl_alg(local,
                                    hw->rate_control_algorithm);
      if (result < 0) {
            printk(KERN_DEBUG "%s: Failed to initialize rate control "
                   "algorithm\n", wiphy_name(local->hw.wiphy));
            goto fail_rate;
      }

      result = ieee80211_wep_init(local);

      if (result < 0) {
            printk(KERN_DEBUG "%s: Failed to initialize wep\n",
                   wiphy_name(local->hw.wiphy));
            goto fail_wep;
      }

      ieee80211_install_qdisc(local->mdev);

      /* add one default STA interface */
      result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
                          IEEE80211_IF_TYPE_STA);
      if (result)
            printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
                   wiphy_name(local->hw.wiphy));

      local->reg_state = IEEE80211_DEV_REGISTERED;
      rtnl_unlock();

      ieee80211_led_init(local);

      return 0;

fail_wep:
      rate_control_deinitialize(local);
fail_rate:
      ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
      unregister_netdevice(local->mdev);
fail_dev:
      rtnl_unlock();
      sta_info_stop(local);
fail_sta_info:
      debugfs_hw_del(local);
      destroy_workqueue(local->hw.workqueue);
fail_workqueue:
      wiphy_unregister(local->hw.wiphy);
      return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);

int ieee80211_register_hwmode(struct ieee80211_hw *hw,
                        struct ieee80211_hw_mode *mode)
{
      struct ieee80211_local *local = hw_to_local(hw);
      struct ieee80211_rate *rate;
      int i;

      INIT_LIST_HEAD(&mode->list);
      list_add_tail(&mode->list, &local->modes_list);

      local->hw_modes |= (1 << mode->mode);
      for (i = 0; i < mode->num_rates; i++) {
            rate = &(mode->rates[i]);
            rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
      }
      ieee80211_prepare_rates(local, mode);

      if (!local->oper_hw_mode) {
            /* Default to this mode */
            local->hw.conf.phymode = mode->mode;
            local->oper_hw_mode = local->scan_hw_mode = mode;
            local->oper_channel = local->scan_channel = &mode->channels[0];
            local->hw.conf.mode = local->oper_hw_mode;
            local->hw.conf.chan = local->oper_channel;
      }

      if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
            ieee80211_set_default_regdomain(mode);

      return 0;
}
EXPORT_SYMBOL(ieee80211_register_hwmode);

void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{
      struct ieee80211_local *local = hw_to_local(hw);
      struct ieee80211_sub_if_data *sdata, *tmp;
      int i;

      tasklet_kill(&local->tx_pending_tasklet);
      tasklet_kill(&local->tasklet);

      rtnl_lock();

      BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);

      local->reg_state = IEEE80211_DEV_UNREGISTERED;

      /*
       * At this point, interface list manipulations are fine
       * because the driver cannot be handing us frames any
       * more and the tasklet is killed.
       */

      /*
       * First, we remove all non-master interfaces. Do this because they
       * may have bss pointer dependency on the master, and when we free
       * the master these would be freed as well, breaking our list
       * iteration completely.
       */
      list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
            if (sdata->dev == local->mdev)
                  continue;
            list_del(&sdata->list);
            __ieee80211_if_del(local, sdata);
      }

      /* then, finally, remove the master interface */
      __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));

      rtnl_unlock();

      ieee80211_rx_bss_list_deinit(local->mdev);
      ieee80211_clear_tx_pending(local);
      sta_info_stop(local);
      rate_control_deinitialize(local);
      debugfs_hw_del(local);

      for (i = 0; i < NUM_IEEE80211_MODES; i++) {
            kfree(local->supp_rates[i]);
            kfree(local->basic_rates[i]);
      }

      if (skb_queue_len(&local->skb_queue)
                  || skb_queue_len(&local->skb_queue_unreliable))
            printk(KERN_WARNING "%s: skb_queue not empty\n",
                   wiphy_name(local->hw.wiphy));
      skb_queue_purge(&local->skb_queue);
      skb_queue_purge(&local->skb_queue_unreliable);

      destroy_workqueue(local->hw.workqueue);
      wiphy_unregister(local->hw.wiphy);
      ieee80211_wep_free(local);
      ieee80211_led_exit(local);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);

void ieee80211_free_hw(struct ieee80211_hw *hw)
{
      struct ieee80211_local *local = hw_to_local(hw);

      ieee80211_if_free(local->mdev);
      wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);

static int __init ieee80211_init(void)
{
      struct sk_buff *skb;
      int ret;

      BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));

#ifdef CONFIG_MAC80211_RCSIMPLE
      ret = ieee80211_rate_control_register(&mac80211_rcsimple);
      if (ret)
            return ret;
#endif

      ret = ieee80211_wme_register();
      if (ret) {
#ifdef CONFIG_MAC80211_RCSIMPLE
            ieee80211_rate_control_unregister(&mac80211_rcsimple);
#endif
            printk(KERN_DEBUG "ieee80211_init: failed to "
                   "initialize WME (err=%d)\n", ret);
            return ret;
      }

      ieee80211_debugfs_netdev_init();
      ieee80211_regdomain_init();

      return 0;
}

static void __exit ieee80211_exit(void)
{
#ifdef CONFIG_MAC80211_RCSIMPLE
      ieee80211_rate_control_unregister(&mac80211_rcsimple);
#endif

      ieee80211_wme_unregister();
      ieee80211_debugfs_netdev_exit();
}


subsys_initcall(ieee80211_init);
module_exit(ieee80211_exit);

MODULE_DESCRIPTION("IEEE 802.11 subsystem");
MODULE_LICENSE("GPL");

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