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b7413430d4
linux/net/mac80211/main.c
Johannes Berg b7413430d4 mac80211: fix work race 
When we stop an interface, the work on it may still be pending
or running. We do cancel the timer, but we do not currently
protect against the work struct. The race is very unlikely to
hit -- it'll happen only when the driver is using mac80211's
workqueue to run long-running tasks and the sta/mesh works are
delayed for quite a bit.

This patch fixes it by cancelling the work explicitly.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-09-15 16:48:20 -04:00

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/*
* 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 "rate.h"
#include "mesh.h"
#include "wep.h"
#include "wme.h"
#include "aes_ccm.h"
#include "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_BCN_PRBRESP_PROMISC;
if (local->fif_fcsfail)
new_flags |= FIF_FCSFAIL;
if (local->fif_plcpfail)
new_flags |= FIF_PLCPFAIL;
if (local->fif_control)
new_flags |= FIF_CONTROL;
if (local->fif_other_bss)
new_flags |= FIF_OTHER_BSS;
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 (netif_running(sdata->dev)) {
res = 0;
break;
}
}
if (res)
return res;
netif_tx_start_all_queues(local->mdev);
return 0;
}
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 (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)
{
int meshhdrlen;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
/* 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 - meshhdrlen) {
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 sta_info *sta;
struct ieee80211_if_init_conf conf;
u32 changed = 0;
int res;
bool need_hw_reconfig = 0;
u8 null_addr[ETH_ALEN] = {0};
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
/* fail early if user set an invalid address */
if (compare_ether_addr(dev->dev_addr, null_addr) &&
!is_valid_ether_addr(dev->dev_addr))
return -EADDRNOTAVAIL;
/* 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 && netif_running(ndev)) {
/*
* Allow only a single IBSS interface to be up at any
* time. This is restricted because beacon distribution
* cannot work properly if both are in the same IBSS.
*
* To remove this restriction we'd have to disallow them
* from setting the same SSID on different IBSS interfaces
* belonging to the same hardware. Then, however, we're
* faced with having to adopt two different TSF timers...
*/
if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
return -EBUSY;
/*
* The remaining checks are only performed for interfaces
* with the same MAC address.
*/
if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
continue;
/*
* check whether it may have the same address
*/
if (!identical_mac_addr_allowed(sdata->vif.type,
nsdata->vif.type))
return -ENOTUNIQ;
/*
* can only add VLANs to enabled APs
*/
if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
nsdata->vif.type == IEEE80211_IF_TYPE_AP)
sdata->bss = &nsdata->u.ap;
}
}
switch (sdata->vif.type) {
case IEEE80211_IF_TYPE_WDS:
if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
return -ENOLINK;
break;
case IEEE80211_IF_TYPE_VLAN:
if (!sdata->bss)
return -ENOLINK;
list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
break;
case IEEE80211_IF_TYPE_AP:
sdata->bss = &sdata->u.ap;
break;
case IEEE80211_IF_TYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
/* mesh ifaces must set allmulti to forward mcast traffic */
atomic_inc(&local->iff_allmultis);
break;
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)
goto err_del_bss;
need_hw_reconfig = 1;
ieee80211_led_radio(local, local->hw.conf.radio_enabled);
}
/*
* Check all interfaces and copy the hopefully now-present
* MAC address to those that have the special null one.
*/
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
/*
* No need to check netif_running since we do not allow
* it to start up with this invalid address.
*/
if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
memcpy(ndev->dev_addr,
local->hw.wiphy->perm_addr,
ETH_ALEN);
}
if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
ETH_ALEN);
/*
* Validate the MAC address for this device.
*/
if (!is_valid_ether_addr(dev->dev_addr)) {
if (!local->open_count && local->ops->stop)
local->ops->stop(local_to_hw(local));
return -EADDRNOTAVAIL;
}
switch (sdata->vif.type) {
case IEEE80211_IF_TYPE_VLAN:
/* no need to tell driver */
break;
case IEEE80211_IF_TYPE_MNTR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs++;
break;
}
/* must be before the call to ieee80211_configure_filter */
local->monitors++;
if (local->monitors == 1)
local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
local->fif_control++;
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss++;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
break;
case IEEE80211_IF_TYPE_STA:
case IEEE80211_IF_TYPE_IBSS:
sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
/* fall through */
default:
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = dev->dev_addr;
res = local->ops->add_interface(local_to_hw(local), &conf);
if (res)
goto err_stop;
if (ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_start_mesh(sdata);
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_bss_info_change_notify(sdata, changed);
ieee80211_enable_keys(sdata);
if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
!(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
netif_carrier_off(dev);
else
netif_carrier_on(dev);
}
if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
/* Create STA entry for the WDS peer */
sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
GFP_KERNEL);
if (!sta) {
res = -ENOMEM;
goto err_del_interface;
}
/* no locking required since STA is not live yet */
sta->flags |= WLAN_STA_AUTHORIZED;
res = sta_info_insert(sta);
if (res) {
/* STA has been freed */
goto err_del_interface;
}
}
if (local->open_count == 0) {
res = dev_open(local->mdev);
WARN_ON(res);
if (res)
goto err_del_interface;
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++;
if (need_hw_reconfig) {
ieee80211_hw_config(local);
/*
* set default queue parameters so drivers don't
* need to initialise the hardware if the hardware
* doesn't start up with sane defaults
*/
ieee80211_set_wmm_default(sdata);
}
/*
* ieee80211_sta_work is disabled while network interface
* is down. Therefore, some configuration changes may not
* yet be effective. Trigger execution of ieee80211_sta_work
* to fix this.
*/
if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
queue_work(local->hw.workqueue, &ifsta->work);
}
netif_tx_start_all_queues(dev);
return 0;
err_del_interface:
local->ops->remove_interface(local_to_hw(local), &conf);
err_stop:
if (!local->open_count && local->ops->stop)
local->ops->stop(local_to_hw(local));
err_del_bss:
sdata->bss = NULL;
if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
list_del(&sdata->u.vlan.list);
return res;
}
static int ieee80211_stop(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_init_conf conf;
struct sta_info *sta;
/*
* Stop TX on this interface first.
*/
netif_tx_stop_all_queues(dev);
/*
* Now delete all active aggregation sessions.
*/
rcu_read_lock();
list_for_each_entry_rcu(sta, &local->sta_list, list) {
if (sta->sdata == sdata)
ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
}
rcu_read_unlock();
/*
* Remove all stations associated with this interface.
*
* This must be done before calling ops->remove_interface()
* because otherwise we can later invoke ops->sta_notify()
* whenever the STAs are removed, and that invalidates driver
* assumptions about always getting a vif pointer that is valid
* (because if we remove a STA after ops->remove_interface()
* the driver will have removed the vif info already!)
*
* We could relax this and only unlink the stations from the
* hash table and list but keep them on a per-sdata list that
* will be inserted back again when the interface is brought
* up again, but I don't currently see a use case for that,
* except with WDS which gets a STA entry created when it is
* brought up.
*/
sta_info_flush(local, sdata);
/*
* 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);
/* APs need special treatment */
if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
struct ieee80211_sub_if_data *vlan, *tmp;
struct beacon_data *old_beacon = sdata->u.ap.beacon;
/* remove beacon */
rcu_assign_pointer(sdata->u.ap.beacon, NULL);
synchronize_rcu();
kfree(old_beacon);
/* down all dependent devices, that is VLANs */
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->vif.type) {
case IEEE80211_IF_TYPE_VLAN:
list_del(&sdata->u.vlan.list);
/* no need to tell driver */
break;
case IEEE80211_IF_TYPE_MNTR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs--;
break;
}
local->monitors--;
if (local->monitors == 0)
local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
local->fif_control--;
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss--;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
break;
case IEEE80211_IF_TYPE_STA:
case IEEE80211_IF_TYPE_IBSS:
sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
memset(sdata->u.sta.bssid, 0, ETH_ALEN);
del_timer_sync(&sdata->u.sta.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->u.sta.work);
/*
* 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->scan_sdata == sdata) {
if (!local->ops->hw_scan) {
local->sta_sw_scanning = 0;
cancel_delayed_work(&local->scan_work);
} else
local->sta_hw_scanning = 0;
}
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 */
case IEEE80211_IF_TYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif)) {
/* allmulti is always set on mesh ifaces */
atomic_dec(&local->iff_allmultis);
ieee80211_stop_mesh(sdata);
}
/* fall through */
default:
conf.vif = &sdata->vif;
conf.type = sdata->vif.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);
}
sdata->bss = NULL;
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));
ieee80211_led_radio(local, 0);
flush_workqueue(local->hw.workqueue);
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,
};
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 = free_netdev;
/* we will validate the address ourselves in ->open */
dev->validate_addr = NULL;
}
/* everything else */
int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_conf conf;
if (WARN_ON(!netif_running(sdata->dev)))
return 0;
if (!local->ops->config_interface)
return 0;
memset(&conf, 0, sizeof(conf));
conf.changed = changed;
if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
sdata->vif.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->vif.type == IEEE80211_IF_TYPE_AP) {
conf.bssid = sdata->dev->dev_addr;
conf.ssid = sdata->u.ap.ssid;
conf.ssid_len = sdata->u.ap.ssid_len;
} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
u8 zero[ETH_ALEN] = { 0 };
conf.bssid = zero;
conf.ssid = zero;
conf.ssid_len = 0;
} else {
WARN_ON(1);
return -EINVAL;
}
if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
return -EINVAL;
if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
return -EINVAL;
return local->ops->config_interface(local_to_hw(local),
&sdata->vif, &conf);
}
int ieee80211_hw_config(struct ieee80211_local *local)
{
struct ieee80211_channel *chan;
int ret = 0;
if (local->sta_sw_scanning)
chan = local->scan_channel;
else
chan = local->oper_channel;
local->hw.conf.channel = chan;
if (!local->hw.conf.power_level)
local->hw.conf.power_level = chan->max_power;
else
local->hw.conf.power_level = min(chan->max_power,
local->hw.conf.power_level);
local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
wiphy_name(local->hw.wiphy), chan->center_freq);
#endif
if (local->open_count)
ret = local->ops->config(local_to_hw(local), &local->hw.conf);
return ret;
}
/**
* ieee80211_handle_ht should be used only after legacy configuration
* has been determined namely band, as ht configuration depends upon
* the hardware's HT abilities for a _specific_ band.
*/
u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
struct ieee80211_ht_info *req_ht_cap,
struct ieee80211_ht_bss_info *req_bss_cap)
{
struct ieee80211_conf *conf = &local->hw.conf;
struct ieee80211_supported_band *sband;
struct ieee80211_ht_info ht_conf;
struct ieee80211_ht_bss_info ht_bss_conf;
u32 changed = 0;
int i;
u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
u8 tx_mcs_set_cap;
sband = local->hw.wiphy->bands[conf->channel->band];
memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
/* HT is not supported */
if (!sband->ht_info.ht_supported) {
conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
goto out;
}
/* disable HT */
if (!enable_ht) {
if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
changed |= BSS_CHANGED_HT;
conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
conf->ht_conf.ht_supported = 0;
goto out;
}
if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
changed |= BSS_CHANGED_HT;
conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
ht_conf.ht_supported = 1;
ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
ht_conf.ampdu_density = req_ht_cap->ampdu_density;
/* Bits 96-100 */
tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
/* configure suppoerted Tx MCS according to requested MCS
* (based in most cases on Rx capabilities of peer) and self
* Tx MCS capabilities (as defined by low level driver HW
* Tx capabilities) */
if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
goto check_changed;
/* Counting from 0 therfore + 1 */
if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
max_tx_streams = ((tx_mcs_set_cap &
IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
for (i = 0; i < max_tx_streams; i++)
ht_conf.supp_mcs_set[i] =
sband->ht_info.supp_mcs_set[i] &
req_ht_cap->supp_mcs_set[i];
if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
for (i = IEEE80211_SUPP_MCS_SET_UEQM;
i < IEEE80211_SUPP_MCS_SET_LEN; i++)
ht_conf.supp_mcs_set[i] =
sband->ht_info.supp_mcs_set[i] &
req_ht_cap->supp_mcs_set[i];
check_changed:
/* if bss configuration changed store the new one */
if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
changed |= BSS_CHANGED_HT;
memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
}
out:
return changed;
}
void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
u32 changed)
{
struct ieee80211_local *local = sdata->local;
if (!changed)
return;
if (local->ops->bss_info_changed)
local->ops->bss_info_changed(local_to_hw(local),
&sdata->vif,
&sdata->bss_conf,
changed);
}
u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
{
sdata->bss_conf.use_cts_prot = 0;
sdata->bss_conf.use_short_preamble = 0;
return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
}
void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
struct sk_buff *skb)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
int tmp;
skb->dev = local->mdev;
skb->pkt_type = IEEE80211_TX_STATUS_MSG;
skb_queue_tail(info->flags & IEEE80211_TX_CTL_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))) {
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_ra_tid *ra_tid;
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->pkt_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:
skb->pkt_type = 0;
ieee80211_tx_status(local_to_hw(local), skb);
break;
case IEEE80211_DELBA_MSG:
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
ieee80211_stop_tx_ba_cb(local_to_hw(local),
ra_tid->ra, ra_tid->tid);
dev_kfree_skb(skb);
break;
case IEEE80211_ADDBA_MSG:
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
ieee80211_start_tx_ba_cb(local_to_hw(local),
ra_tid->ra, ra_tid->tid);
dev_kfree_skb(skb);
break ;
default:
WARN_ON(1);
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.
*/
static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
struct ieee80211_key *key,
struct sk_buff *skb)
{
unsigned int hdrlen, iv_len, mic_len;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
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 >= hdrlen + mic_len &&
!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
skb_trim(skb, skb->len - mic_len);
if (skb->len >= hdrlen + iv_len) {
memmove(skb->data + iv_len, skb->data, hdrlen);
hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
}
no_key:
if (ieee80211_is_data_qos(hdr->frame_control)) {
hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
hdrlen - IEEE80211_QOS_CTL_LEN);
skb_pull(skb, IEEE80211_QOS_CTL_LEN);
}
}
static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
struct sta_info *sta,
struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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 wakes up for the next time.
*/
set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
/*
* This code races in the following way:
*
* (1) STA sends frame indicating it will go to sleep and does so
* (2) hardware/firmware adds STA to filter list, passes frame up
* (3) hardware/firmware processes TX fifo and suppresses a frame
* (4) we get TX status before having processed the frame and
* knowing that the STA has gone to sleep.
*
* This is actually quite unlikely even when both those events are
* processed from interrupts coming in quickly after one another or
* even at the same time because we queue both TX status events and
* RX frames to be processed by a tasklet and process them in the
* same order that they were received or TX status last. Hence, there
* is no race as long as the frame RX is processed before the next TX
* status, which drivers can ensure, see below.
*
* Note that this can only happen if the hardware or firmware can
* actually add STAs to the filter list, if this is done by the
* driver in response to set_tim() (which will only reduce the race
* this whole filtering tries to solve, not completely solve it)
* this situation cannot happen.
*
* To completely solve this race drivers need to make sure that they
* (a) don't mix the irq-safe/not irq-safe TX status/RX processing
* functions and
* (b) always process RX events before TX status events if ordering
* can be unknown, for example with different interrupt status
* bits.
*/
if (test_sta_flags(sta, WLAN_STA_PS) &&
skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
ieee80211_remove_tx_extra(local, sta->key, skb);
skb_queue_tail(&sta->tx_filtered, skb);
return;
}
if (!test_sta_flags(sta, WLAN_STA_PS) &&
!(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
/* Software retry the packet once */
info->flags |= IEEE80211_TX_CTL_REQUEUE;
ieee80211_remove_tx_extra(local, sta->key, skb);
dev_queue_xmit(skb);
return;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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),
!!test_sta_flags(sta, WLAN_STA_PS), jiffies);
#endif
dev_kfree_skb(skb);
}
void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct sk_buff *skb2;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
u16 frag, type;
__le16 fc;
struct ieee80211_tx_status_rtap_hdr *rthdr;
struct ieee80211_sub_if_data *sdata;
struct net_device *prev_dev = NULL;
struct sta_info *sta;
rcu_read_lock();
if (info->status.excessive_retries) {
sta = sta_info_get(local, hdr->addr1);
if (sta) {
if (test_sta_flags(sta, WLAN_STA_PS)) {
/*
* The STA is in power save mode, so assume
* that this TX packet failed because of that.
*/
ieee80211_handle_filtered_frame(local, sta, skb);
rcu_read_unlock();
return;
}
}
}
fc = hdr->frame_control;
if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
(ieee80211_is_data_qos(fc))) {
u16 tid, ssn;
u8 *qc;
sta = sta_info_get(local, hdr->addr1);
if (sta) {
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & 0xf;
ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
& IEEE80211_SCTL_SEQ);
ieee80211_send_bar(sta->sdata, hdr->addr1,
tid, ssn);
}
}
if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
sta = sta_info_get(local, hdr->addr1);
if (sta) {
ieee80211_handle_filtered_frame(local, sta, skb);
rcu_read_unlock();
return;
}
} else
rate_control_tx_status(local->mdev, skb);
rcu_read_unlock();
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 (info->flags & IEEE80211_TX_STAT_ACK) {
if (frag == 0) {
local->dot11TransmittedFrameCount++;
if (is_multicast_ether_addr(hdr->addr1))
local->dot11MulticastTransmittedFrameCount++;
if (info->status.retry_count > 0)
local->dot11RetryCount++;
if (info->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);
/*
* This is a bit racy but we can avoid a lot of work
* with this test...
*/
if (!local->monitors && !local->cooked_mntrs) {
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 (!(info->flags & IEEE80211_TX_STAT_ACK) &&
!is_multicast_ether_addr(hdr->addr1))
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
(info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
rthdr->data_retries = info->status.retry_count;
/* 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));
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
if (!netif_running(sdata->dev))
continue;
if (prev_dev) {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2) {
skb2->dev = prev_dev;
netif_rx(skb2);
}
}
prev_dev = sdata->dev;
}
}
if (prev_dev) {
skb->dev = prev_dev;
netif_rx(skb);
skb = NULL;
}
rcu_read_unlock();
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 ieee80211_local *local;
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;
local->hw.queues = 1; /* default */
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;
INIT_LIST_HEAD(&local->interfaces);
spin_lock_init(&local->key_lock);
INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
sta_info_init(local);
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;
enum ieee80211_band band;
struct net_device *mdev;
struct wireless_dev *mwdev;
/*
* generic code guarantees at least one band,
* set this very early because much code assumes
* that hw.conf.channel is assigned
*/
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[band];
if (sband) {
/* init channel we're on */
local->hw.conf.channel =
local->oper_channel =
local->scan_channel = &sband->channels[0];
break;
}
}
/* if low-level driver supports AP, we also support VLAN */
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
/* mac80211 always supports monitor */
local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
result = wiphy_register(local->hw.wiphy);
if (result < 0)
return result;
/*
* We use the number of queues for feature tests (QoS, HT) internally
* so restrict them appropriately.
*/
if (hw->queues > IEEE80211_MAX_QUEUES)
hw->queues = IEEE80211_MAX_QUEUES;
if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
if (hw->queues < 4)
hw->ampdu_queues = 0;
mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
"wmaster%d", ether_setup,
ieee80211_num_queues(hw));
if (!mdev)
goto fail_mdev_alloc;
mwdev = netdev_priv(mdev);
mdev->ieee80211_ptr = mwdev;
mwdev->wiphy = local->hw.wiphy;
local->mdev = mdev;
ieee80211_rx_bss_list_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;
name = wiphy_dev(local->hw.wiphy)->driver->name;
local->hw.workqueue = create_freezeable_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);
if (local->hw.conf.beacon_int < 10)
local->hw.conf.beacon_int = 100;
if (local->hw.max_listen_interval == 0)
local->hw.max_listen_interval = 1;
local->hw.conf.listen_interval = local->hw.max_listen_interval;
local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
IEEE80211_HW_SIGNAL_DB |
IEEE80211_HW_SIGNAL_DBM) ?
IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
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;
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: %d\n",
wiphy_name(local->hw.wiphy), result);
goto fail_wep;
}
local->mdev->select_queue = ieee80211_select_queue;
/* add one default STA interface */
result = ieee80211_if_add(local, "wlan%d", NULL,
IEEE80211_IF_TYPE_STA, NULL);
if (result)
printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
wiphy_name(local->hw.wiphy));
rtnl_unlock();
ieee80211_led_init(local);
return 0;
fail_wep:
rate_control_deinitialize(local);
fail_rate:
unregister_netdevice(local->mdev);
local->mdev = NULL;
fail_dev:
rtnl_unlock();
sta_info_stop(local);
fail_sta_info:
debugfs_hw_del(local);
destroy_workqueue(local->hw.workqueue);
fail_workqueue:
if (local->mdev)
free_netdev(local->mdev);
fail_mdev_alloc:
wiphy_unregister(local->hw.wiphy);
return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);
void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
tasklet_kill(&local->tx_pending_tasklet);
tasklet_kill(&local->tasklet);
rtnl_lock();
/*
* 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 virtual interfaces. */
ieee80211_remove_interfaces(local);
/* then, finally, remove the master interface */
unregister_netdevice(local->mdev);
rtnl_unlock();
ieee80211_rx_bss_list_deinit(local);
ieee80211_clear_tx_pending(local);
sta_info_stop(local);
rate_control_deinitialize(local);
debugfs_hw_del(local);
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);
free_netdev(local->mdev);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);
void ieee80211_free_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
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_info) > sizeof(skb->cb));
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
ret = rc80211_pid_init();
if (ret)
return ret;
ieee80211_debugfs_netdev_init();
return 0;
}
static void __exit ieee80211_exit(void)
{
rc80211_pid_exit();
/*
* For key todo, it'll be empty by now but the work
* might still be scheduled.
*/
flush_scheduled_work();
if (mesh_allocated)
ieee80211s_stop();
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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