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kernel-fxtec-pro1x/net/mac80211/main.c
Assaf Krauss ad81b2f97d mac80211: Fixing slow IBSS rejoin 
This patch fixes the issue of slow reconnection to an IBSS cell after
disconnection from it. Now the interface's bssid is reset upon ifdown.

ieee80211_sta_find_ibss:
if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
	    (bss = ieee80211_rx_bss_get(dev, bssid,
					local->hw.conf.channel->center_freq,
					ifsta->ssid, ifsta->ssid_len)))

Note:
In general disconnection is still not handled properly in mac80211

Signed-off-by: Assaf Krauss <assaf.krauss@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-06-09 15:50:20 -04:00

1906 lines
53 KiB
C
Raw Blame History

/*
* 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"
#define SUPP_MCS_SET_LEN 16
/*
* 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 (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)
{
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) {
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;
bool need_hw_reconfig = 0;
struct sta_info *sta;
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)) {
/*
* 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;
/*
* Disallow multiple IBSS/STA mode interfaces.
*
* This is a technical restriction, it is possible although
* most likely not IEEE 802.11 compliant to have multiple
* STAs with just a single hardware (the TSF timer will not
* be adjusted properly.)
*
* However, because mac80211 uses the master device's BSS
* information for each STA/IBSS interface, doing this will
* currently corrupt that BSS information completely, unless,
* a not very useful case, both STAs are associated to the
* same BSS.
*
* To remove this restriction, the BSS information needs to
* be embedded in the STA/IBSS mode sdata instead of using
* the master device's BSS structure.
*/
if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
(nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
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->u.vlan.ap = nsdata;
}
}
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->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:
case IEEE80211_IF_TYPE_MESH_POINT:
/* 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;
need_hw_reconfig = 1;
ieee80211_led_radio(local, local->hw.conf.radio_enabled);
}
switch (sdata->vif.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:
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_tx_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_tx_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;
ieee80211_if_config(dev);
ieee80211_reset_erp_info(dev);
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;
}
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);
/*
* 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_start_queue(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));
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_stop_queue(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(dev, 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);
sdata->u.vlan.ap = NULL;
/* 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_tx_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_tx_unlock_bh(local->mdev);
break;
case IEEE80211_IF_TYPE_MESH_POINT:
case IEEE80211_IF_TYPE_STA:
case IEEE80211_IF_TYPE_IBSS:
sdata->u.sta.state = IEEE80211_DISABLED;
memset(sdata->u.sta.bssid, 0, ETH_ALEN);
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->scan_dev == sdata->dev) {
if (!local->ops->hw_scan) {
local->sta_sw_scanning = 0;
cancel_delayed_work(&local->scan_work);
} else
local->sta_hw_scanning = 0;
}
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.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);
}
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);
tasklet_disable(&local->tx_pending_tasklet);
tasklet_disable(&local->tasklet);
}
return 0;
}
int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct sta_info *sta;
struct ieee80211_sub_if_data *sdata;
u16 start_seq_num = 0;
u8 *state;
int ret;
DECLARE_MAC_BUF(mac);
if (tid >= STA_TID_NUM)
return -EINVAL;
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
rcu_read_lock();
sta = sta_info_get(local, ra);
if (!sta) {
printk(KERN_DEBUG "Could not find the station\n");
rcu_read_unlock();
return -ENOENT;
}
spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
/* we have tried too many times, receiver does not want A-MPDU */
if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
ret = -EBUSY;
goto start_ba_exit;
}
state = &sta->ampdu_mlme.tid_state_tx[tid];
/* check if the TID is not in aggregation flow already */
if (*state != HT_AGG_STATE_IDLE) {
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "BA request denied - session is not "
"idle on tid %u\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
ret = -EAGAIN;
goto start_ba_exit;
}
/* prepare A-MPDU MLME for Tx aggregation */
sta->ampdu_mlme.tid_tx[tid] =
kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
if (!sta->ampdu_mlme.tid_tx[tid]) {
if (net_ratelimit())
printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
tid);
ret = -ENOMEM;
goto start_ba_exit;
}
/* Tx timer */
sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
sta_addba_resp_timer_expired;
sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
(unsigned long)&sta->timer_to_tid[tid];
init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
/* ensure that TX flow won't interrupt us
* until the end of the call to requeue function */
spin_lock_bh(&local->mdev->queue_lock);
/* create a new queue for this aggregation */
ret = ieee80211_ht_agg_queue_add(local, sta, tid);
/* case no queue is available to aggregation
* don't switch to aggregation */
if (ret) {
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "BA request denied - queue unavailable for"
" tid %d\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
goto start_ba_err;
}
sdata = sta->sdata;
/* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
* call back right away, it must see that the flow has begun */
*state |= HT_ADDBA_REQUESTED_MSK;
if (local->ops->ampdu_action)
ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
ra, tid, &start_seq_num);
if (ret) {
/* No need to requeue the packets in the agg queue, since we
* held the tx lock: no packet could be enqueued to the newly
* allocated queue */
ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "BA request denied - HW unavailable for"
" tid %d\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
*state = HT_AGG_STATE_IDLE;
goto start_ba_err;
}
/* Will put all the packets in the new SW queue */
ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
spin_unlock_bh(&local->mdev->queue_lock);
/* send an addBA request */
sta->ampdu_mlme.dialog_token_allocator++;
sta->ampdu_mlme.tid_tx[tid]->dialog_token =
sta->ampdu_mlme.dialog_token_allocator;
sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
sta->ampdu_mlme.tid_tx[tid]->dialog_token,
sta->ampdu_mlme.tid_tx[tid]->ssn,
0x40, 5000);
/* activate the timer for the recipient's addBA response */
sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
jiffies + ADDBA_RESP_INTERVAL;
add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
goto start_ba_exit;
start_ba_err:
kfree(sta->ampdu_mlme.tid_tx[tid]);
sta->ampdu_mlme.tid_tx[tid] = NULL;
spin_unlock_bh(&local->mdev->queue_lock);
ret = -EBUSY;
start_ba_exit:
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
u8 *ra, u16 tid,
enum ieee80211_back_parties initiator)
{
struct ieee80211_local *local = hw_to_local(hw);
struct sta_info *sta;
u8 *state;
int ret = 0;
DECLARE_MAC_BUF(mac);
if (tid >= STA_TID_NUM)
return -EINVAL;
rcu_read_lock();
sta = sta_info_get(local, ra);
if (!sta) {
rcu_read_unlock();
return -ENOENT;
}
/* check if the TID is in aggregation */
state = &sta->ampdu_mlme.tid_state_tx[tid];
spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
if (*state != HT_AGG_STATE_OPERATIONAL) {
ret = -ENOENT;
goto stop_BA_exit;
}
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
*state = HT_AGG_STATE_REQ_STOP_BA_MSK |
(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
if (local->ops->ampdu_action)
ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
ra, tid, NULL);
/* case HW denied going back to legacy */
if (ret) {
WARN_ON(ret != -EBUSY);
*state = HT_AGG_STATE_OPERATIONAL;
ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
goto stop_BA_exit;
}
stop_BA_exit:
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct sta_info *sta;
u8 *state;
DECLARE_MAC_BUF(mac);
if (tid >= STA_TID_NUM) {
printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
tid, STA_TID_NUM);
return;
}
rcu_read_lock();
sta = sta_info_get(local, ra);
if (!sta) {
rcu_read_unlock();
printk(KERN_DEBUG "Could not find station: %s\n",
print_mac(mac, ra));
return;
}
state = &sta->ampdu_mlme.tid_state_tx[tid];
spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
*state);
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
rcu_read_unlock();
return;
}
WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
*state |= HT_ADDBA_DRV_READY_MSK;
if (*state == HT_AGG_STATE_OPERATIONAL) {
printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
}
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct sta_info *sta;
u8 *state;
int agg_queue;
DECLARE_MAC_BUF(mac);
if (tid >= STA_TID_NUM) {
printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
tid, STA_TID_NUM);
return;
}
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
rcu_read_lock();
sta = sta_info_get(local, ra);
if (!sta) {
printk(KERN_DEBUG "Could not find station: %s\n",
print_mac(mac, ra));
rcu_read_unlock();
return;
}
state = &sta->ampdu_mlme.tid_state_tx[tid];
spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
rcu_read_unlock();
return;
}
if (*state & HT_AGG_STATE_INITIATOR_MSK)
ieee80211_send_delba(sta->sdata->dev, ra, tid,
WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
agg_queue = sta->tid_to_tx_q[tid];
/* avoid ordering issues: we are the only one that can modify
* the content of the qdiscs */
spin_lock_bh(&local->mdev->queue_lock);
/* remove the queue for this aggregation */
ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
spin_unlock_bh(&local->mdev->queue_lock);
/* we just requeued the all the frames that were in the removed
* queue, and since we might miss a softirq we do netif_schedule.
* ieee80211_wake_queue is not used here as this queue is not
* necessarily stopped */
netif_schedule(local->mdev);
*state = HT_AGG_STATE_IDLE;
sta->ampdu_mlme.addba_req_num[tid] = 0;
kfree(sta->ampdu_mlme.tid_tx[tid]);
sta->ampdu_mlme.tid_tx[tid] = NULL;
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
const u8 *ra, u16 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_ra_tid *ra_tid;
struct sk_buff *skb = dev_alloc_skb(0);
if (unlikely(!skb)) {
if (net_ratelimit())
printk(KERN_WARNING "%s: Not enough memory, "
"dropping start BA session", skb->dev->name);
return;
}
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
memcpy(&ra_tid->ra, ra, ETH_ALEN);
ra_tid->tid = tid;
skb->pkt_type = IEEE80211_ADDBA_MSG;
skb_queue_tail(&local->skb_queue, skb);
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
const u8 *ra, u16 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_ra_tid *ra_tid;
struct sk_buff *skb = dev_alloc_skb(0);
if (unlikely(!skb)) {
if (net_ratelimit())
printk(KERN_WARNING "%s: Not enough memory, "
"dropping stop BA session", skb->dev->name);
return;
}
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
memcpy(&ra_tid->ra, ra, ETH_ALEN);
ra_tid->tid = tid;
skb->pkt_type = IEEE80211_DELBA_MSG;
skb_queue_tail(&local->skb_queue, skb);
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
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;
}
/* 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->vif.type;
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 (ieee80211_vif_is_mesh(&sdata->vif)) {
conf.beacon = beacon;
conf.beacon_control = control;
ieee80211_start_mesh(dev);
} else if (sdata->vif.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),
&sdata->vif, &conf);
}
int ieee80211_if_config(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
return ieee80211_if_config_beacon(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 ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sk_buff *skb;
if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
return 0;
skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
&control);
if (!skb)
return -ENOMEM;
return __ieee80211_if_config(dev, skb, &control);
}
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;
int i;
u32 changed = 0;
sband = local->hw.wiphy->bands[conf->channel->band];
/* HT is not supported */
if (!sband->ht_info.ht_supported) {
conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
return 0;
}
memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
if (enable_ht) {
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_MIMO_PS);
ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
for (i = 0; i < 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];
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;
/* 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));
}
} else {
if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
changed |= BSS_CHANGED_HT;
conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
}
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);
}
void ieee80211_reset_erp_info(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
sdata->bss_conf.use_cts_prot = 0;
sdata->bss_conf.use_short_preamble = 0;
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_ERP_CTS_PROT |
BSS_CHANGED_ERP_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;
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:
/* 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;
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: /* 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 = vif_to_sdata(control->vif)->dev->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;
if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
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);
}
}
}
static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
struct sta_info *sta,
struct sk_buff *skb,
struct ieee80211_tx_status *status)
{
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.
*/
sta->flags |= 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 (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);
return;
}
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);
return;
}
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);
}
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;
struct net_device *prev_dev = NULL;
if (!status) {
printk(KERN_ERR
"%s: ieee80211_tx_status called with NULL status\n",
wiphy_name(local->hw.wiphy));
dev_kfree_skb(skb);
return;
}
rcu_read_lock();
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;
ieee80211_handle_filtered_frame(local, sta,
skb, status);
rcu_read_unlock();
return;
}
}
}
if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
struct sta_info *sta;
sta = sta_info_get(local, hdr->addr1);
if (sta) {
ieee80211_handle_filtered_frame(local, sta, skb,
status);
rcu_read_unlock();
return;
}
} else
rate_control_tx_status(local->mdev, skb, status);
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 (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);
/*
* 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 (!(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;
/* 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 ieee80211_sub_if_data *sdata;
/*
* 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;
}
}
result = wiphy_register(local->hw.wiphy);
if (result < 0)
return result;
/* for now, mdev needs sub_if_data :/ */
mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
"wmaster%d", ether_setup);
if (!mdev)
goto fail_mdev_alloc;
sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
mdev->ieee80211_ptr = &sdata->wdev;
sdata->wdev.wiphy = local->hw.wiphy;
local->mdev = mdev;
ieee80211_rx_bss_list_init(mdev);
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->vif.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);
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, NULL);
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);
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 != NULL) {
ieee80211_if_free(local->mdev);
local->mdev = NULL;
}
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);
struct ieee80211_sub_if_data *sdata, *tmp;
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);
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);
ieee80211_if_free(local->mdev);
local->mdev = NULL;
}
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_packet_data) > sizeof(skb->cb));
ret = rc80211_pid_init();
if (ret)
goto out;
ret = ieee80211_wme_register();
if (ret) {
printk(KERN_DEBUG "ieee80211_init: failed to "
"initialize WME (err=%d)\n", ret);
goto out_cleanup_pid;
}
ieee80211_debugfs_netdev_init();
return 0;
out_cleanup_pid:
rc80211_pid_exit();
out:
return ret;
}
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_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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