Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / net / wireless / core.c
index 24a21ad..45bd63a 100644 (file)
@@ -1,23 +1,28 @@
 /*
  * This is the linux wireless configuration interface.
  *
- * Copyright 2006, 2007                Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2006-2009         Johannes Berg <johannes@sipsolutions.net>
  */
 
 #include <linux/if.h>
 #include <linux/module.h>
 #include <linux/err.h>
-#include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/nl80211.h>
 #include <linux/debugfs.h>
 #include <linux/notifier.h>
 #include <linux/device.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/sched.h>
 #include <net/genetlink.h>
 #include <net/cfg80211.h>
-#include <net/wireless.h>
+#include "nl80211.h"
 #include "core.h"
 #include "sysfs.h"
+#include "debugfs.h"
+#include "wext-compat.h"
+#include "ethtool.h"
 
 /* name for sysfs, %d is appended */
 #define PHY_NAME "phy"
@@ -29,111 +34,560 @@ MODULE_DESCRIPTION("wireless configuration support");
 /* RCU might be appropriate here since we usually
  * only read the list, and that can happen quite
  * often because we need to do it for each command */
-LIST_HEAD(cfg80211_drv_list);
-DEFINE_MUTEX(cfg80211_drv_mutex);
-static int wiphy_counter;
+LIST_HEAD(cfg80211_rdev_list);
+int cfg80211_rdev_list_generation;
+
+/*
+ * This is used to protect the cfg80211_rdev_list
+ */
+DEFINE_MUTEX(cfg80211_mutex);
 
 /* for debugfs */
 static struct dentry *ieee80211_debugfs_dir;
 
-/* exported functions */
+/* requires cfg80211_mutex to be held! */
+struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
+{
+       struct cfg80211_registered_device *result = NULL, *rdev;
+
+       if (!wiphy_idx_valid(wiphy_idx))
+               return NULL;
+
+       assert_cfg80211_lock();
+
+       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+               if (rdev->wiphy_idx == wiphy_idx) {
+                       result = rdev;
+                       break;
+               }
+       }
+
+       return result;
+}
 
-struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
+int get_wiphy_idx(struct wiphy *wiphy)
 {
-       struct cfg80211_registered_device *drv;
-       int alloc_size;
+       struct cfg80211_registered_device *rdev;
+       if (!wiphy)
+               return WIPHY_IDX_STALE;
+       rdev = wiphy_to_dev(wiphy);
+       return rdev->wiphy_idx;
+}
+
+/* requires cfg80211_rdev_mutex to be held! */
+struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
+{
+       struct cfg80211_registered_device *rdev;
+
+       if (!wiphy_idx_valid(wiphy_idx))
+               return NULL;
 
-       alloc_size = sizeof(*drv) + sizeof_priv;
+       assert_cfg80211_lock();
 
-       drv = kzalloc(alloc_size, GFP_KERNEL);
-       if (!drv)
+       rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
+       if (!rdev)
                return NULL;
+       return &rdev->wiphy;
+}
+
+/* requires cfg80211_mutex to be held! */
+struct cfg80211_registered_device *
+__cfg80211_rdev_from_info(struct genl_info *info)
+{
+       int ifindex;
+       struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
+       struct net_device *dev;
+       int err = -EINVAL;
+
+       assert_cfg80211_lock();
+
+       if (info->attrs[NL80211_ATTR_WIPHY]) {
+               bywiphyidx = cfg80211_rdev_by_wiphy_idx(
+                               nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
+               err = -ENODEV;
+       }
+
+       if (info->attrs[NL80211_ATTR_IFINDEX]) {
+               ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
+               dev = dev_get_by_index(genl_info_net(info), ifindex);
+               if (dev) {
+                       if (dev->ieee80211_ptr)
+                               byifidx =
+                                       wiphy_to_dev(dev->ieee80211_ptr->wiphy);
+                       dev_put(dev);
+               }
+               err = -ENODEV;
+       }
+
+       if (bywiphyidx && byifidx) {
+               if (bywiphyidx != byifidx)
+                       return ERR_PTR(-EINVAL);
+               else
+                       return bywiphyidx; /* == byifidx */
+       }
+       if (bywiphyidx)
+               return bywiphyidx;
+
+       if (byifidx)
+               return byifidx;
+
+       return ERR_PTR(err);
+}
+
+struct cfg80211_registered_device *
+cfg80211_get_dev_from_info(struct genl_info *info)
+{
+       struct cfg80211_registered_device *rdev;
+
+       mutex_lock(&cfg80211_mutex);
+       rdev = __cfg80211_rdev_from_info(info);
+
+       /* if it is not an error we grab the lock on
+        * it to assure it won't be going away while
+        * we operate on it */
+       if (!IS_ERR(rdev))
+               mutex_lock(&rdev->mtx);
+
+       mutex_unlock(&cfg80211_mutex);
+
+       return rdev;
+}
+
+struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
+{
+       struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
+       struct net_device *dev;
+
+       mutex_lock(&cfg80211_mutex);
+       dev = dev_get_by_index(net, ifindex);
+       if (!dev)
+               goto out;
+       if (dev->ieee80211_ptr) {
+               rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
+               mutex_lock(&rdev->mtx);
+       } else
+               rdev = ERR_PTR(-ENODEV);
+       dev_put(dev);
+ out:
+       mutex_unlock(&cfg80211_mutex);
+       return rdev;
+}
+
+/* requires cfg80211_mutex to be held */
+int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
+                       char *newname)
+{
+       struct cfg80211_registered_device *rdev2;
+       int wiphy_idx, taken = -1, result, digits;
+
+       assert_cfg80211_lock();
+
+       /* prohibit calling the thing phy%d when %d is not its number */
+       sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
+       if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
+               /* count number of places needed to print wiphy_idx */
+               digits = 1;
+               while (wiphy_idx /= 10)
+                       digits++;
+               /*
+                * deny the name if it is phy<idx> where <idx> is printed
+                * without leading zeroes. taken == strlen(newname) here
+                */
+               if (taken == strlen(PHY_NAME) + digits)
+                       return -EINVAL;
+       }
+
+
+       /* Ignore nop renames */
+       if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
+               return 0;
+
+       /* Ensure another device does not already have this name. */
+       list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
+               if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
+                       return -EINVAL;
+
+       result = device_rename(&rdev->wiphy.dev, newname);
+       if (result)
+               return result;
+
+       if (rdev->wiphy.debugfsdir &&
+           !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
+                           rdev->wiphy.debugfsdir,
+                           rdev->wiphy.debugfsdir->d_parent,
+                           newname))
+               printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
+                      newname);
+
+       nl80211_notify_dev_rename(rdev);
+
+       return 0;
+}
+
+int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
+                         struct net *net)
+{
+       struct wireless_dev *wdev;
+       int err = 0;
+
+       if (!rdev->wiphy.netnsok)
+               return -EOPNOTSUPP;
+
+       list_for_each_entry(wdev, &rdev->netdev_list, list) {
+               wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
+               err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
+               if (err)
+                       break;
+               wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
+       }
+
+       if (err) {
+               /* failed -- clean up to old netns */
+               net = wiphy_net(&rdev->wiphy);
+
+               list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
+                                                    list) {
+                       wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
+                       err = dev_change_net_namespace(wdev->netdev, net,
+                                                       "wlan%d");
+                       WARN_ON(err);
+                       wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
+               }
+       }
+
+       wiphy_net_set(&rdev->wiphy, net);
+
+       return err;
+}
+
+static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
+{
+       struct cfg80211_registered_device *rdev = data;
+
+       rdev->ops->rfkill_poll(&rdev->wiphy);
+}
+
+static int cfg80211_rfkill_set_block(void *data, bool blocked)
+{
+       struct cfg80211_registered_device *rdev = data;
+       struct wireless_dev *wdev;
+
+       if (!blocked)
+               return 0;
+
+       rtnl_lock();
+       mutex_lock(&rdev->devlist_mtx);
+
+       list_for_each_entry(wdev, &rdev->netdev_list, list)
+               dev_close(wdev->netdev);
+
+       mutex_unlock(&rdev->devlist_mtx);
+       rtnl_unlock();
+
+       return 0;
+}
+
+static void cfg80211_rfkill_sync_work(struct work_struct *work)
+{
+       struct cfg80211_registered_device *rdev;
+
+       rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
+       cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
+}
+
+static void cfg80211_event_work(struct work_struct *work)
+{
+       struct cfg80211_registered_device *rdev;
+
+       rdev = container_of(work, struct cfg80211_registered_device,
+                           event_work);
+
+       rtnl_lock();
+       cfg80211_lock_rdev(rdev);
+
+       cfg80211_process_rdev_events(rdev);
+       cfg80211_unlock_rdev(rdev);
+       rtnl_unlock();
+}
 
-       drv->ops = ops;
+/* exported functions */
+
+struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
+{
+       static int wiphy_counter;
+
+       struct cfg80211_registered_device *rdev;
+       int alloc_size;
 
-       mutex_lock(&cfg80211_drv_mutex);
+       WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
+       WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
+       WARN_ON(ops->connect && !ops->disconnect);
+       WARN_ON(ops->join_ibss && !ops->leave_ibss);
+       WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
+       WARN_ON(ops->add_station && !ops->del_station);
+       WARN_ON(ops->add_mpath && !ops->del_mpath);
 
-       drv->idx = wiphy_counter;
+       alloc_size = sizeof(*rdev) + sizeof_priv;
 
-       /* now increase counter for the next device unless
-        * it has wrapped previously */
-       if (wiphy_counter >= 0)
-               wiphy_counter++;
+       rdev = kzalloc(alloc_size, GFP_KERNEL);
+       if (!rdev)
+               return NULL;
+
+       rdev->ops = ops;
+
+       mutex_lock(&cfg80211_mutex);
 
-       mutex_unlock(&cfg80211_drv_mutex);
+       rdev->wiphy_idx = wiphy_counter++;
 
-       if (unlikely(drv->idx < 0)) {
+       if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
+               wiphy_counter--;
+               mutex_unlock(&cfg80211_mutex);
                /* ugh, wrapped! */
-               kfree(drv);
+               kfree(rdev);
                return NULL;
        }
 
+       mutex_unlock(&cfg80211_mutex);
+
        /* give it a proper name */
-       snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
-                PHY_NAME "%d", drv->idx);
+       dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
+
+       mutex_init(&rdev->mtx);
+       mutex_init(&rdev->devlist_mtx);
+       INIT_LIST_HEAD(&rdev->netdev_list);
+       spin_lock_init(&rdev->bss_lock);
+       INIT_LIST_HEAD(&rdev->bss_list);
+       INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
+
+#ifdef CONFIG_CFG80211_WEXT
+       rdev->wiphy.wext = &cfg80211_wext_handler;
+#endif
 
-       mutex_init(&drv->mtx);
-       mutex_init(&drv->devlist_mtx);
-       INIT_LIST_HEAD(&drv->netdev_list);
+       device_initialize(&rdev->wiphy.dev);
+       rdev->wiphy.dev.class = &ieee80211_class;
+       rdev->wiphy.dev.platform_data = rdev;
 
-       device_initialize(&drv->wiphy.dev);
-       drv->wiphy.dev.class = &ieee80211_class;
-       drv->wiphy.dev.platform_data = drv;
+       rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 
-       return &drv->wiphy;
+       wiphy_net_set(&rdev->wiphy, &init_net);
+
+       rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
+       rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
+                                  &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
+                                  &rdev->rfkill_ops, rdev);
+
+       if (!rdev->rfkill) {
+               kfree(rdev);
+               return NULL;
+       }
+
+       INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
+       INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
+       INIT_WORK(&rdev->event_work, cfg80211_event_work);
+
+       init_waitqueue_head(&rdev->dev_wait);
+
+       /*
+        * Initialize wiphy parameters to IEEE 802.11 MIB default values.
+        * Fragmentation and RTS threshold are disabled by default with the
+        * special -1 value.
+        */
+       rdev->wiphy.retry_short = 7;
+       rdev->wiphy.retry_long = 4;
+       rdev->wiphy.frag_threshold = (u32) -1;
+       rdev->wiphy.rts_threshold = (u32) -1;
+
+       return &rdev->wiphy;
 }
 EXPORT_SYMBOL(wiphy_new);
 
 int wiphy_register(struct wiphy *wiphy)
 {
-       struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
        int res;
+       enum ieee80211_band band;
+       struct ieee80211_supported_band *sband;
+       bool have_band = false;
+       int i;
+       u16 ifmodes = wiphy->interface_modes;
+
+       /* sanity check ifmodes */
+       WARN_ON(!ifmodes);
+       ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
+       if (WARN_ON(ifmodes != wiphy->interface_modes))
+               wiphy->interface_modes = ifmodes;
+
+       /* sanity check supported bands/channels */
+       for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+               sband = wiphy->bands[band];
+               if (!sband)
+                       continue;
+
+               sband->band = band;
+
+               if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
+                       return -EINVAL;
+
+               /*
+                * Since we use a u32 for rate bitmaps in
+                * ieee80211_get_response_rate, we cannot
+                * have more than 32 legacy rates.
+                */
+               if (WARN_ON(sband->n_bitrates > 32))
+                       return -EINVAL;
+
+               for (i = 0; i < sband->n_channels; i++) {
+                       sband->channels[i].orig_flags =
+                               sband->channels[i].flags;
+                       sband->channels[i].orig_mag =
+                               sband->channels[i].max_antenna_gain;
+                       sband->channels[i].orig_mpwr =
+                               sband->channels[i].max_power;
+                       sband->channels[i].band = band;
+               }
+
+               have_band = true;
+       }
+
+       if (!have_band) {
+               WARN_ON(1);
+               return -EINVAL;
+       }
 
-       mutex_lock(&cfg80211_drv_mutex);
+       /* check and set up bitrates */
+       ieee80211_set_bitrate_flags(wiphy);
 
+       res = device_add(&rdev->wiphy.dev);
+       if (res)
+               return res;
 
-       res = device_add(&drv->wiphy.dev);
+       res = rfkill_register(rdev->rfkill);
        if (res)
-               goto out_unlock;
+               goto out_rm_dev;
+
+       mutex_lock(&cfg80211_mutex);
 
-       list_add(&drv->list, &cfg80211_drv_list);
+       /* set up regulatory info */
+       wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
+
+       list_add(&rdev->list, &cfg80211_rdev_list);
+       cfg80211_rdev_list_generation++;
+
+       mutex_unlock(&cfg80211_mutex);
 
        /* add to debugfs */
-       drv->wiphy.debugfsdir =
-               debugfs_create_dir(wiphy_name(&drv->wiphy),
+       rdev->wiphy.debugfsdir =
+               debugfs_create_dir(wiphy_name(&rdev->wiphy),
                                   ieee80211_debugfs_dir);
+       if (IS_ERR(rdev->wiphy.debugfsdir))
+               rdev->wiphy.debugfsdir = NULL;
+
+       if (wiphy->custom_regulatory) {
+               struct regulatory_request request;
+
+               request.wiphy_idx = get_wiphy_idx(wiphy);
+               request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
+               request.alpha2[0] = '9';
+               request.alpha2[1] = '9';
+
+               nl80211_send_reg_change_event(&request);
+       }
+
+       cfg80211_debugfs_rdev_add(rdev);
+
+       return 0;
 
-       res = 0;
-out_unlock:
-       mutex_unlock(&cfg80211_drv_mutex);
+ out_rm_dev:
+       device_del(&rdev->wiphy.dev);
        return res;
 }
 EXPORT_SYMBOL(wiphy_register);
 
-void wiphy_unregister(struct wiphy *wiphy)
+void wiphy_rfkill_start_polling(struct wiphy *wiphy)
+{
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+       if (!rdev->ops->rfkill_poll)
+               return;
+       rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
+       rfkill_resume_polling(rdev->rfkill);
+}
+EXPORT_SYMBOL(wiphy_rfkill_start_polling);
+
+void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 {
-       struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+       rfkill_pause_polling(rdev->rfkill);
+}
+EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 
-       mutex_lock(&cfg80211_drv_mutex);
+void wiphy_unregister(struct wiphy *wiphy)
+{
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 
-       /* hold registered driver mutex during list removal as well
-        * to make sure no commands are in progress at the moment */
-       mutex_lock(&drv->mtx);
-       list_del(&drv->list);
-       mutex_unlock(&drv->mtx);
+       rfkill_unregister(rdev->rfkill);
 
-       device_del(&drv->wiphy.dev);
-       debugfs_remove(drv->wiphy.debugfsdir);
+       /* protect the device list */
+       mutex_lock(&cfg80211_mutex);
 
-       mutex_unlock(&cfg80211_drv_mutex);
+       wait_event(rdev->dev_wait, ({
+               int __count;
+               mutex_lock(&rdev->devlist_mtx);
+               __count = rdev->opencount;
+               mutex_unlock(&rdev->devlist_mtx);
+               __count == 0;}));
+
+       mutex_lock(&rdev->devlist_mtx);
+       BUG_ON(!list_empty(&rdev->netdev_list));
+       mutex_unlock(&rdev->devlist_mtx);
+
+       /*
+        * First remove the hardware from everywhere, this makes
+        * it impossible to find from userspace.
+        */
+       debugfs_remove_recursive(rdev->wiphy.debugfsdir);
+       list_del(&rdev->list);
+
+       /*
+        * Try to grab rdev->mtx. If a command is still in progress,
+        * hopefully the driver will refuse it since it's tearing
+        * down the device already. We wait for this command to complete
+        * before unlinking the item from the list.
+        * Note: as codified by the BUG_ON above we cannot get here if
+        * a virtual interface is still present. Hence, we can only get
+        * to lock contention here if userspace issues a command that
+        * identified the hardware by wiphy index.
+        */
+       cfg80211_lock_rdev(rdev);
+       /* nothing */
+       cfg80211_unlock_rdev(rdev);
+
+       /* If this device got a regulatory hint tell core its
+        * free to listen now to a new shiny device regulatory hint */
+       reg_device_remove(wiphy);
+
+       cfg80211_rdev_list_generation++;
+       device_del(&rdev->wiphy.dev);
+
+       mutex_unlock(&cfg80211_mutex);
+
+       flush_work(&rdev->scan_done_wk);
+       cancel_work_sync(&rdev->conn_work);
+       flush_work(&rdev->event_work);
 }
 EXPORT_SYMBOL(wiphy_unregister);
 
-void cfg80211_dev_free(struct cfg80211_registered_device *drv)
+void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 {
-       mutex_destroy(&drv->mtx);
-       mutex_destroy(&drv->devlist_mtx);
-       kfree(drv);
+       struct cfg80211_internal_bss *scan, *tmp;
+       rfkill_destroy(rdev->rfkill);
+       mutex_destroy(&rdev->mtx);
+       mutex_destroy(&rdev->devlist_mtx);
+       list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
+               cfg80211_put_bss(&scan->pub);
+       kfree(rdev);
 }
 
 void wiphy_free(struct wiphy *wiphy)
@@ -142,50 +596,229 @@ void wiphy_free(struct wiphy *wiphy)
 }
 EXPORT_SYMBOL(wiphy_free);
 
+void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
+{
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+       if (rfkill_set_hw_state(rdev->rfkill, blocked))
+               schedule_work(&rdev->rfkill_sync);
+}
+EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
+
+static void wdev_cleanup_work(struct work_struct *work)
+{
+       struct wireless_dev *wdev;
+       struct cfg80211_registered_device *rdev;
+
+       wdev = container_of(work, struct wireless_dev, cleanup_work);
+       rdev = wiphy_to_dev(wdev->wiphy);
+
+       cfg80211_lock_rdev(rdev);
+
+       if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
+               rdev->scan_req->aborted = true;
+               ___cfg80211_scan_done(rdev, true);
+       }
+
+       cfg80211_unlock_rdev(rdev);
+
+       mutex_lock(&rdev->devlist_mtx);
+       rdev->opencount--;
+       mutex_unlock(&rdev->devlist_mtx);
+       wake_up(&rdev->dev_wait);
+
+       dev_put(wdev->netdev);
+}
+
+static struct device_type wiphy_type = {
+       .name   = "wlan",
+};
+
 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
                                         unsigned long state,
                                         void *ndev)
 {
        struct net_device *dev = ndev;
+       struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev;
 
-       if (!dev->ieee80211_ptr)
-               return 0;
+       if (!wdev)
+               return NOTIFY_DONE;
+
+       rdev = wiphy_to_dev(wdev->wiphy);
 
-       rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
+       WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 
        switch (state) {
+       case NETDEV_POST_INIT:
+               SET_NETDEV_DEVTYPE(dev, &wiphy_type);
+               break;
        case NETDEV_REGISTER:
+               /*
+                * NB: cannot take rdev->mtx here because this may be
+                * called within code protected by it when interfaces
+                * are added with nl80211.
+                */
+               mutex_init(&wdev->mtx);
+               INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
+               INIT_LIST_HEAD(&wdev->event_list);
+               spin_lock_init(&wdev->event_lock);
                mutex_lock(&rdev->devlist_mtx);
-               list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
+               list_add(&wdev->list, &rdev->netdev_list);
+               rdev->devlist_generation++;
+               /* can only change netns with wiphy */
+               dev->features |= NETIF_F_NETNS_LOCAL;
+
                if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
                                      "phy80211")) {
                        printk(KERN_ERR "wireless: failed to add phy80211 "
                                "symlink to netdev!\n");
                }
-               dev->ieee80211_ptr->netdev = dev;
+               wdev->netdev = dev;
+               wdev->sme_state = CFG80211_SME_IDLE;
                mutex_unlock(&rdev->devlist_mtx);
+#ifdef CONFIG_CFG80211_WEXT
+               wdev->wext.default_key = -1;
+               wdev->wext.default_mgmt_key = -1;
+               wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
+               wdev->wext.ps = wdev->wiphy->ps_default;
+               wdev->wext.ps_timeout = 100;
+               if (rdev->ops->set_power_mgmt)
+                       if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
+                                                     wdev->wext.ps,
+                                                     wdev->wext.ps_timeout)) {
+                               /* assume this means it's off */
+                               wdev->wext.ps = false;
+                       }
+#endif
+               if (!dev->ethtool_ops)
+                       dev->ethtool_ops = &cfg80211_ethtool_ops;
+               break;
+       case NETDEV_GOING_DOWN:
+               switch (wdev->iftype) {
+               case NL80211_IFTYPE_ADHOC:
+                       cfg80211_leave_ibss(rdev, dev, true);
+                       break;
+               case NL80211_IFTYPE_STATION:
+                       wdev_lock(wdev);
+#ifdef CONFIG_CFG80211_WEXT
+                       kfree(wdev->wext.ie);
+                       wdev->wext.ie = NULL;
+                       wdev->wext.ie_len = 0;
+                       wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
+#endif
+                       __cfg80211_disconnect(rdev, dev,
+                                             WLAN_REASON_DEAUTH_LEAVING, true);
+                       cfg80211_mlme_down(rdev, dev);
+                       wdev_unlock(wdev);
+                       break;
+               default:
+                       break;
+               }
+               break;
+       case NETDEV_DOWN:
+               dev_hold(dev);
+               schedule_work(&wdev->cleanup_work);
+               break;
+       case NETDEV_UP:
+               /*
+                * If we have a really quick DOWN/UP succession we may
+                * have this work still pending ... cancel it and see
+                * if it was pending, in which case we need to account
+                * for some of the work it would have done.
+                */
+               if (cancel_work_sync(&wdev->cleanup_work)) {
+                       mutex_lock(&rdev->devlist_mtx);
+                       rdev->opencount--;
+                       mutex_unlock(&rdev->devlist_mtx);
+                       dev_put(dev);
+               }
+#ifdef CONFIG_CFG80211_WEXT
+               cfg80211_lock_rdev(rdev);
+               mutex_lock(&rdev->devlist_mtx);
+               wdev_lock(wdev);
+               switch (wdev->iftype) {
+               case NL80211_IFTYPE_ADHOC:
+                       cfg80211_ibss_wext_join(rdev, wdev);
+                       break;
+               case NL80211_IFTYPE_STATION:
+                       cfg80211_mgd_wext_connect(rdev, wdev);
+                       break;
+               default:
+                       break;
+               }
+               wdev_unlock(wdev);
+               rdev->opencount++;
+               mutex_unlock(&rdev->devlist_mtx);
+               cfg80211_unlock_rdev(rdev);
+#endif
                break;
        case NETDEV_UNREGISTER:
+               /*
+                * NB: cannot take rdev->mtx here because this may be
+                * called within code protected by it when interfaces
+                * are removed with nl80211.
+                */
                mutex_lock(&rdev->devlist_mtx);
-               if (!list_empty(&dev->ieee80211_ptr->list)) {
+               /*
+                * It is possible to get NETDEV_UNREGISTER
+                * multiple times. To detect that, check
+                * that the interface is still on the list
+                * of registered interfaces, and only then
+                * remove and clean it up.
+                */
+               if (!list_empty(&wdev->list)) {
                        sysfs_remove_link(&dev->dev.kobj, "phy80211");
-                       list_del_init(&dev->ieee80211_ptr->list);
+                       list_del_init(&wdev->list);
+                       rdev->devlist_generation++;
+#ifdef CONFIG_CFG80211_WEXT
+                       kfree(wdev->wext.keys);
+#endif
                }
                mutex_unlock(&rdev->devlist_mtx);
                break;
+       case NETDEV_PRE_UP:
+               if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
+                       return notifier_from_errno(-EOPNOTSUPP);
+               if (rfkill_blocked(rdev->rfkill))
+                       return notifier_from_errno(-ERFKILL);
+               break;
        }
 
-       return 0;
+       return NOTIFY_DONE;
 }
 
 static struct notifier_block cfg80211_netdev_notifier = {
        .notifier_call = cfg80211_netdev_notifier_call,
 };
 
-static int cfg80211_init(void)
+static void __net_exit cfg80211_pernet_exit(struct net *net)
 {
-       int err = wiphy_sysfs_init();
+       struct cfg80211_registered_device *rdev;
+
+       rtnl_lock();
+       mutex_lock(&cfg80211_mutex);
+       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+               if (net_eq(wiphy_net(&rdev->wiphy), net))
+                       WARN_ON(cfg80211_switch_netns(rdev, &init_net));
+       }
+       mutex_unlock(&cfg80211_mutex);
+       rtnl_unlock();
+}
+
+static struct pernet_operations cfg80211_pernet_ops = {
+       .exit = cfg80211_pernet_exit,
+};
+
+static int __init cfg80211_init(void)
+{
+       int err;
+
+       err = register_pernet_device(&cfg80211_pernet_ops);
+       if (err)
+               goto out_fail_pernet;
+
+       err = wiphy_sysfs_init();
        if (err)
                goto out_fail_sysfs;
 
@@ -193,21 +826,38 @@ static int cfg80211_init(void)
        if (err)
                goto out_fail_notifier;
 
+       err = nl80211_init();
+       if (err)
+               goto out_fail_nl80211;
+
        ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 
+       err = regulatory_init();
+       if (err)
+               goto out_fail_reg;
+
        return 0;
 
+out_fail_reg:
+       debugfs_remove(ieee80211_debugfs_dir);
+out_fail_nl80211:
+       unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 out_fail_notifier:
        wiphy_sysfs_exit();
 out_fail_sysfs:
+       unregister_pernet_device(&cfg80211_pernet_ops);
+out_fail_pernet:
        return err;
 }
-module_init(cfg80211_init);
+subsys_initcall(cfg80211_init);
 
 static void cfg80211_exit(void)
 {
        debugfs_remove(ieee80211_debugfs_dir);
+       nl80211_exit();
        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
        wiphy_sysfs_exit();
+       regulatory_exit();
+       unregister_pernet_device(&cfg80211_pernet_ops);
 }
 module_exit(cfg80211_exit);