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linux/net/mac80211/iface.c
Johannes Berg 8b305780ed mac80211: fix virtual monitor interface locking 
The virtual monitor interface has a locking issue, it calls
into the channel context code with the iflist mutex held
which isn't allowed since it is usually acquired the other
way around. The mutex is still required for the interface
iteration, but need not be held across the channel calls.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-03-20 22:26:35 +01:00

1697 lines
43 KiB
C
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/*
* Interface handling (except master interface)
*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"
#include "mesh.h"
#include "led.h"
#include "driver-ops.h"
#include "wme.h"
#include "rate.h"
/**
* DOC: Interface list locking
*
* The interface list in each struct ieee80211_local is protected
* three-fold:
*
* (1) modifications may only be done under the RTNL
* (2) modifications and readers are protected against each other by
* the iflist_mtx.
* (3) modifications are done in an RCU manner so atomic readers
* can traverse the list in RCU-safe blocks.
*
* As a consequence, reads (traversals) of the list can be protected
* by either the RTNL, the iflist_mtx or RCU.
*/
bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_chanctx_conf *chanctx_conf;
int power;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (!chanctx_conf) {
rcu_read_unlock();
return false;
}
power = chanctx_conf->def.chan->max_power;
rcu_read_unlock();
if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
power = min(power, sdata->user_power_level);
if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
power = min(power, sdata->ap_power_level);
if (power != sdata->vif.bss_conf.txpower) {
sdata->vif.bss_conf.txpower = power;
ieee80211_hw_config(sdata->local, 0);
return true;
}
return false;
}
void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
{
if (__ieee80211_recalc_txpower(sdata))
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
}
static u32 ieee80211_idle_off(struct ieee80211_local *local)
{
if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
return 0;
local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
return IEEE80211_CONF_CHANGE_IDLE;
}
static u32 ieee80211_idle_on(struct ieee80211_local *local)
{
if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
return 0;
drv_flush(local, false);
local->hw.conf.flags |= IEEE80211_CONF_IDLE;
return IEEE80211_CONF_CHANGE_IDLE;
}
void ieee80211_recalc_idle(struct ieee80211_local *local)
{
bool working = false, scanning, active;
unsigned int led_trig_start = 0, led_trig_stop = 0;
struct ieee80211_roc_work *roc;
u32 change;
lockdep_assert_held(&local->mtx);
active = !list_empty(&local->chanctx_list) || local->monitors;
if (!local->ops->remain_on_channel) {
list_for_each_entry(roc, &local->roc_list, list) {
working = true;
break;
}
}
scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
if (working || scanning)
led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
else
led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
if (active)
led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
else
led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
if (working || scanning || active)
change = ieee80211_idle_off(local);
else
change = ieee80211_idle_on(local);
if (change)
ieee80211_hw_config(local, change);
}
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
{
struct ieee80211_sub_if_data *sdata;
u64 new, mask, tmp;
u8 *m;
int ret = 0;
if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
return 0;
m = addr;
new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
m = local->hw.wiphy->addr_mask;
mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
mutex_lock(&local->iflist_mtx);
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
continue;
m = sdata->vif.addr;
tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
if ((new & ~mask) != (tmp & ~mask)) {
ret = -EINVAL;
break;
}
}
mutex_unlock(&local->iflist_mtx);
return ret;
}
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sockaddr *sa = addr;
int ret;
if (ieee80211_sdata_running(sdata))
return -EBUSY;
ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
if (ret)
return ret;
ret = eth_mac_addr(dev, sa);
if (ret == 0)
memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
return ret;
}
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return type1 == NL80211_IFTYPE_MONITOR ||
type2 == NL80211_IFTYPE_MONITOR ||
type1 == NL80211_IFTYPE_P2P_DEVICE ||
type2 == NL80211_IFTYPE_P2P_DEVICE ||
(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
(type1 == NL80211_IFTYPE_WDS &&
(type2 == NL80211_IFTYPE_WDS ||
type2 == NL80211_IFTYPE_AP)) ||
(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
(type1 == NL80211_IFTYPE_AP_VLAN &&
(type2 == NL80211_IFTYPE_AP ||
type2 == NL80211_IFTYPE_AP_VLAN));
}
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype iftype)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *nsdata;
ASSERT_RTNL();
/* we hold the RTNL here so can safely walk the list */
list_for_each_entry(nsdata, &local->interfaces, list) {
if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
/*
* 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 (iftype == NL80211_IFTYPE_ADHOC &&
nsdata->vif.type == NL80211_IFTYPE_ADHOC)
return -EBUSY;
/*
* The remaining checks are only performed for interfaces
* with the same MAC address.
*/
if (!ether_addr_equal(sdata->vif.addr,
nsdata->vif.addr))
continue;
/*
* check whether it may have the same address
*/
if (!identical_mac_addr_allowed(iftype,
nsdata->vif.type))
return -ENOTUNIQ;
/*
* can only add VLANs to enabled APs
*/
if (iftype == NL80211_IFTYPE_AP_VLAN &&
nsdata->vif.type == NL80211_IFTYPE_AP)
sdata->bss = &nsdata->u.ap;
}
}
return 0;
}
static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
{
int n_queues = sdata->local->hw.queues;
int i;
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
IEEE80211_INVAL_HW_QUEUE))
return -EINVAL;
if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
n_queues))
return -EINVAL;
}
}
if ((sdata->vif.type != NL80211_IFTYPE_AP &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
!(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
return 0;
}
if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
return -EINVAL;
if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
return -EINVAL;
return 0;
}
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
const int offset)
{
struct ieee80211_local *local = sdata->local;
u32 flags = sdata->u.mntr_flags;
#define ADJUST(_f, _s) do { \
if (flags & MONITOR_FLAG_##_f) \
local->fif_##_s += offset; \
} while (0)
ADJUST(FCSFAIL, fcsfail);
ADJUST(PLCPFAIL, plcpfail);
ADJUST(CONTROL, control);
ADJUST(CONTROL, pspoll);
ADJUST(OTHER_BSS, other_bss);
#undef ADJUST
}
static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
int i;
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
else if (local->hw.queues >= IEEE80211_NUM_ACS)
sdata->vif.hw_queue[i] = i;
else
sdata->vif.hw_queue[i] = 0;
}
sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}
static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
int ret;
if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
return 0;
ASSERT_RTNL();
if (local->monitor_sdata)
return 0;
sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
if (!sdata)
return -ENOMEM;
/* set up data */
sdata->local = local;
sdata->vif.type = NL80211_IFTYPE_MONITOR;
snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
wiphy_name(local->hw.wiphy));
ieee80211_set_default_queues(sdata);
ret = drv_add_interface(local, sdata);
if (WARN_ON(ret)) {
/* ok .. stupid driver, it asked for this! */
kfree(sdata);
return ret;
}
ret = ieee80211_check_queues(sdata);
if (ret) {
kfree(sdata);
return ret;
}
ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
IEEE80211_CHANCTX_EXCLUSIVE);
if (ret) {
drv_remove_interface(local, sdata);
kfree(sdata);
return ret;
}
mutex_lock(&local->iflist_mtx);
rcu_assign_pointer(local->monitor_sdata, sdata);
mutex_unlock(&local->iflist_mtx);
return 0;
}
static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
return;
ASSERT_RTNL();
mutex_lock(&local->iflist_mtx);
sdata = rcu_dereference_protected(local->monitor_sdata,
lockdep_is_held(&local->iflist_mtx));
if (!sdata) {
mutex_unlock(&local->iflist_mtx);
return;
}
rcu_assign_pointer(local->monitor_sdata, NULL);
mutex_unlock(&local->iflist_mtx);
synchronize_net();
ieee80211_vif_release_channel(sdata);
drv_remove_interface(local, sdata);
kfree(sdata);
}
/*
* NOTE: Be very careful when changing this function, it must NOT return
* an error on interface type changes that have been pre-checked, so most
* checks should be in ieee80211_check_concurrent_iface.
*/
int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
struct net_device *dev = wdev->netdev;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
u32 changed = 0;
int res;
u32 hw_reconf_flags = 0;
switch (sdata->vif.type) {
case NL80211_IFTYPE_WDS:
if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
return -ENOLINK;
break;
case NL80211_IFTYPE_AP_VLAN: {
struct ieee80211_sub_if_data *master;
if (!sdata->bss)
return -ENOLINK;
list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
master = container_of(sdata->bss,
struct ieee80211_sub_if_data, u.ap);
sdata->control_port_protocol =
master->control_port_protocol;
sdata->control_port_no_encrypt =
master->control_port_no_encrypt;
break;
}
case NL80211_IFTYPE_AP:
sdata->bss = &sdata->u.ap;
break;
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_P2P_DEVICE:
/* no special treatment */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
/* cannot happen */
WARN_ON(1);
break;
}
if (local->open_count == 0) {
res = drv_start(local);
if (res)
goto err_del_bss;
if (local->ops->napi_poll)
napi_enable(&local->napi);
/* we're brought up, everything changes */
hw_reconf_flags = ~0;
ieee80211_led_radio(local, true);
ieee80211_mod_tpt_led_trig(local,
IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
}
/*
* Copy the hopefully now-present MAC address to
* this interface, if it has the special null one.
*/
if (dev && is_zero_ether_addr(dev->dev_addr)) {
memcpy(dev->dev_addr,
local->hw.wiphy->perm_addr,
ETH_ALEN);
memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
if (!is_valid_ether_addr(dev->dev_addr)) {
res = -EADDRNOTAVAIL;
goto err_stop;
}
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
/* no need to tell driver, but set carrier and chanctx */
if (rtnl_dereference(sdata->bss->beacon)) {
ieee80211_vif_vlan_copy_chanctx(sdata);
netif_carrier_on(dev);
} else {
netif_carrier_off(dev);
}
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs++;
break;
}
if (local->monitors == 0 && local->open_count == 0) {
res = ieee80211_add_virtual_monitor(local);
if (res)
goto err_stop;
}
/* must be before the call to ieee80211_configure_filter */
local->monitors++;
if (local->monitors == 1) {
local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
}
ieee80211_adjust_monitor_flags(sdata, 1);
ieee80211_configure_filter(local);
mutex_lock(&local->mtx);
ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
netif_carrier_on(dev);
break;
default:
if (coming_up) {
ieee80211_del_virtual_monitor(local);
res = drv_add_interface(local, sdata);
if (res)
goto err_stop;
res = ieee80211_check_queues(sdata);
if (res)
goto err_del_interface;
}
drv_add_interface_debugfs(local, sdata);
if (sdata->vif.type == NL80211_IFTYPE_AP) {
local->fif_pspoll++;
local->fif_probe_req++;
ieee80211_configure_filter(local);
} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
local->fif_probe_req++;
}
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_bss_info_change_notify(sdata, changed);
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
netif_carrier_off(dev);
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_P2P_DEVICE:
break;
default:
netif_carrier_on(dev);
}
/*
* 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, true);
}
set_bit(SDATA_STATE_RUNNING, &sdata->state);
if (sdata->vif.type == NL80211_IFTYPE_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_info_pre_move_state(sta, IEEE80211_STA_AUTH);
sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
res = sta_info_insert(sta);
if (res) {
/* STA has been freed */
goto err_del_interface;
}
rate_control_rate_init(sta);
netif_carrier_on(dev);
} else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
rcu_assign_pointer(local->p2p_sdata, sdata);
}
/*
* 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);
if (coming_up)
local->open_count++;
if (hw_reconf_flags)
ieee80211_hw_config(local, hw_reconf_flags);
ieee80211_recalc_ps(local, -1);
if (dev)
netif_tx_start_all_queues(dev);
return 0;
err_del_interface:
drv_remove_interface(local, sdata);
err_stop:
if (!local->open_count)
drv_stop(local);
err_del_bss:
sdata->bss = NULL;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
list_del(&sdata->u.vlan.list);
/* might already be clear but that doesn't matter */
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
return res;
}
static int ieee80211_open(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
int err;
/* fail early if user set an invalid address */
if (!is_valid_ether_addr(dev->dev_addr))
return -EADDRNOTAVAIL;
err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
if (err)
return err;
return ieee80211_do_open(&sdata->wdev, true);
}
static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
bool going_down)
{
struct ieee80211_local *local = sdata->local;
unsigned long flags;
struct sk_buff *skb, *tmp;
u32 hw_reconf_flags = 0;
int i, flushed;
struct ps_data *ps;
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
if (rcu_access_pointer(local->scan_sdata) == sdata)
ieee80211_scan_cancel(local);
/*
* Stop TX on this interface first.
*/
if (sdata->dev)
netif_tx_stop_all_queues(sdata->dev);
ieee80211_roc_purge(sdata);
if (sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_mgd_stop(sdata);
/*
* 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!)
*
* This is relevant only in WDS mode, in all other modes we've
* already removed all stations when disconnecting or similar,
* so warn otherwise.
*
* We call sta_info_flush_cleanup() later, to combine RCU waits.
*/
flushed = sta_info_flush_defer(sdata);
WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
(sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
/*
* 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);
if (sdata->vif.type == NL80211_IFTYPE_AP) {
local->fif_pspoll--;
local->fif_probe_req--;
} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
local->fif_probe_req--;
}
if (sdata->dev) {
netif_addr_lock_bh(sdata->dev);
spin_lock_bh(&local->filter_lock);
__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
sdata->dev->addr_len);
spin_unlock_bh(&local->filter_lock);
netif_addr_unlock_bh(sdata->dev);
ieee80211_configure_filter(local);
}
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
cancel_work_sync(&sdata->recalc_smps);
cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
if (sdata->wdev.cac_started) {
mutex_lock(&local->iflist_mtx);
ieee80211_vif_release_channel(sdata);
mutex_unlock(&local->iflist_mtx);
cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
GFP_KERNEL);
}
/* APs need special treatment */
if (sdata->vif.type == NL80211_IFTYPE_AP) {
struct ieee80211_sub_if_data *vlan, *tmpsdata;
/* down all dependent devices, that is VLANs */
list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
u.vlan.list)
dev_close(vlan->dev);
WARN_ON(!list_empty(&sdata->u.ap.vlans));
} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
/* remove all packets in parent bc_buf pointing to this dev */
ps = &sdata->bss->ps;
spin_lock_irqsave(&ps->bc_buf.lock, flags);
skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
if (skb->dev == sdata->dev) {
__skb_unlink(skb, &ps->bc_buf);
local->total_ps_buffered--;
ieee80211_free_txskb(&local->hw, skb);
}
}
spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
}
if (going_down)
local->open_count--;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
list_del(&sdata->u.vlan.list);
rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
/* no need to tell driver */
break;
case NL80211_IFTYPE_MONITOR:
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_MONITOR;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
ieee80211_del_virtual_monitor(local);
}
ieee80211_adjust_monitor_flags(sdata, -1);
ieee80211_configure_filter(local);
mutex_lock(&local->mtx);
ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
break;
case NL80211_IFTYPE_P2P_DEVICE:
/* relies on synchronize_rcu() below */
rcu_assign_pointer(local->p2p_sdata, NULL);
/* fall through */
default:
cancel_work_sync(&sdata->work);
/*
* When we get here, the interface is marked down.
*
* sta_info_flush_cleanup() requires rcu_barrier()
* first to wait for the station call_rcu() calls
* to complete, here we need at least sychronize_rcu()
* it to wait for the RX path in case it is using the
* interface and enqueuing frames at this very time on
* another CPU.
*/
rcu_barrier();
sta_info_flush_cleanup(sdata);
skb_queue_purge(&sdata->skb_queue);
/*
* Free all remaining keys, there shouldn't be any,
* except maybe group keys in AP more or WDS?
*/
ieee80211_free_keys(sdata);
drv_remove_interface_debugfs(local, sdata);
if (going_down)
drv_remove_interface(local, sdata);
}
sdata->bss = NULL;
ieee80211_recalc_ps(local, -1);
if (local->open_count == 0) {
if (local->ops->napi_poll)
napi_disable(&local->napi);
ieee80211_clear_tx_pending(local);
ieee80211_stop_device(local);
/* no reconfiguring after stop! */
hw_reconf_flags = 0;
}
/* do after stop to avoid reconfiguring when we stop anyway */
if (hw_reconf_flags)
ieee80211_hw_config(local, hw_reconf_flags);
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
skb_queue_walk_safe(&local->pending[i], skb, tmp) {
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
if (info->control.vif == &sdata->vif) {
__skb_unlink(skb, &local->pending[i]);
ieee80211_free_txskb(&local->hw, skb);
}
}
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
if (local->monitors == local->open_count && local->monitors > 0)
ieee80211_add_virtual_monitor(local);
}
static int ieee80211_stop(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ieee80211_do_stop(sdata, true);
return 0;
}
static void ieee80211_set_multicast_list(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
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;
}
spin_lock_bh(&local->filter_lock);
__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
spin_unlock_bh(&local->filter_lock);
ieee80211_queue_work(&local->hw, &local->reconfig_filter);
}
/*
* Called when the netdev is removed or, by the code below, before
* the interface type changes.
*/
static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
{
int flushed;
int i;
/* free extra data */
ieee80211_free_keys(sdata);
ieee80211_debugfs_remove_netdev(sdata);
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
__skb_queue_purge(&sdata->fragments[i].skb_list);
sdata->fragment_next = 0;
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_rmc_free(sdata);
flushed = sta_info_flush(sdata);
WARN_ON(flushed);
}
static void ieee80211_uninit(struct net_device *dev)
{
ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
}
static u16 ieee80211_netdev_select_queue(struct net_device *dev,
struct sk_buff *skb)
{
return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
}
static const struct net_device_ops ieee80211_dataif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_uninit,
.ndo_start_xmit = ieee80211_subif_start_xmit,
.ndo_set_rx_mode = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_netdev_select_queue,
};
static u16 ieee80211_monitor_select_queue(struct net_device *dev,
struct sk_buff *skb)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct ieee80211_hdr *hdr;
struct ieee80211_radiotap_header *rtap = (void *)skb->data;
if (local->hw.queues < IEEE80211_NUM_ACS)
return 0;
if (skb->len < 4 ||
skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
return 0; /* doesn't matter, frame will be dropped */
hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
return ieee80211_select_queue_80211(sdata, skb, hdr);
}
static const struct net_device_ops ieee80211_monitorif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_uninit,
.ndo_start_xmit = ieee80211_monitor_start_xmit,
.ndo_set_rx_mode = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_select_queue = ieee80211_monitor_select_queue,
};
static void ieee80211_if_setup(struct net_device *dev)
{
ether_setup(dev);
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->netdev_ops = &ieee80211_dataif_ops;
dev->destructor = free_netdev;
}
static void ieee80211_iface_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, work);
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct sta_info *sta;
struct ieee80211_ra_tid *ra_tid;
if (!ieee80211_sdata_running(sdata))
return;
if (local->scanning)
return;
/*
* ieee80211_queue_work() should have picked up most cases,
* here we'll pick the rest.
*/
if (WARN(local->suspended,
"interface work scheduled while going to suspend\n"))
return;
/* first process frames */
while ((skb = skb_dequeue(&sdata->skb_queue))) {
struct ieee80211_mgmt *mgmt = (void *)skb->data;
if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
ra_tid = (void *)&skb->cb;
ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
ra_tid->tid);
} else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
ra_tid = (void *)&skb->cb;
ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
ra_tid->tid);
} else if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_BACK) {
int len = skb->len;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (sta) {
switch (mgmt->u.action.u.addba_req.action_code) {
case WLAN_ACTION_ADDBA_REQ:
ieee80211_process_addba_request(
local, sta, mgmt, len);
break;
case WLAN_ACTION_ADDBA_RESP:
ieee80211_process_addba_resp(local, sta,
mgmt, len);
break;
case WLAN_ACTION_DELBA:
ieee80211_process_delba(sdata, sta,
mgmt, len);
break;
default:
WARN_ON(1);
break;
}
}
mutex_unlock(&local->sta_mtx);
} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
struct ieee80211_hdr *hdr = (void *)mgmt;
/*
* So the frame isn't mgmt, but frame_control
* is at the right place anyway, of course, so
* the if statement is correct.
*
* Warn if we have other data frame types here,
* they must not get here.
*/
WARN_ON(hdr->frame_control &
cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
WARN_ON(!(hdr->seq_ctrl &
cpu_to_le16(IEEE80211_SCTL_FRAG)));
/*
* This was a fragment of a frame, received while
* a block-ack session was active. That cannot be
* right, so terminate the session.
*/
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (sta) {
u16 tid = *ieee80211_get_qos_ctl(hdr) &
IEEE80211_QOS_CTL_TID_MASK;
__ieee80211_stop_rx_ba_session(
sta, tid, WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_REQUIRE_SETUP,
true);
}
mutex_unlock(&local->sta_mtx);
} else switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ieee80211_sta_rx_queued_mgmt(sdata, skb);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_rx_queued_mgmt(sdata, skb);
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
ieee80211_mesh_rx_queued_mgmt(sdata, skb);
break;
default:
WARN(1, "frame for unexpected interface type");
break;
}
kfree_skb(skb);
}
/* then other type-dependent work */
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ieee80211_sta_work(sdata);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_work(sdata);
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
ieee80211_mesh_work(sdata);
break;
default:
break;
}
}
static void ieee80211_recalc_smps_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, recalc_smps);
ieee80211_recalc_smps(sdata);
}
/*
* Helper function to initialise an interface to a specific type.
*/
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
/* clear type-dependent union */
memset(&sdata->u, 0, sizeof(sdata->u));
/* and set some type-dependent values */
sdata->vif.type = type;
sdata->vif.p2p = false;
sdata->wdev.iftype = type;
sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
sdata->control_port_no_encrypt = false;
sdata->noack_map = 0;
/* only monitor/p2p-device differ */
if (sdata->dev) {
sdata->dev->netdev_ops = &ieee80211_dataif_ops;
sdata->dev->type = ARPHRD_ETHER;
}
skb_queue_head_init(&sdata->skb_queue);
INIT_WORK(&sdata->work, ieee80211_iface_work);
INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
switch (type) {
case NL80211_IFTYPE_P2P_GO:
type = NL80211_IFTYPE_AP;
sdata->vif.type = type;
sdata->vif.p2p = true;
/* fall through */
case NL80211_IFTYPE_AP:
skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
INIT_LIST_HEAD(&sdata->u.ap.vlans);
sdata->vif.bss_conf.bssid = sdata->vif.addr;
break;
case NL80211_IFTYPE_P2P_CLIENT:
type = NL80211_IFTYPE_STATION;
sdata->vif.type = type;
sdata->vif.p2p = true;
/* fall through */
case NL80211_IFTYPE_STATION:
sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
ieee80211_sta_setup_sdata(sdata);
break;
case NL80211_IFTYPE_ADHOC:
sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
ieee80211_ibss_setup_sdata(sdata);
break;
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_mesh_init_sdata(sdata);
break;
case NL80211_IFTYPE_MONITOR:
sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
MONITOR_FLAG_OTHER_BSS;
break;
case NL80211_IFTYPE_WDS:
sdata->vif.bss_conf.bssid = NULL;
break;
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_P2P_DEVICE:
sdata->vif.bss_conf.bssid = sdata->vif.addr;
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
BUG();
break;
}
ieee80211_debugfs_add_netdev(sdata);
}
static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
struct ieee80211_local *local = sdata->local;
int ret, err;
enum nl80211_iftype internal_type = type;
bool p2p = false;
ASSERT_RTNL();
if (!local->ops->change_interface)
return -EBUSY;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
/*
* Could maybe also all others here?
* Just not sure how that interacts
* with the RX/config path e.g. for
* mesh.
*/
break;
default:
return -EBUSY;
}
switch (type) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
/*
* Could probably support everything
* but WDS here (WDS do_open can fail
* under memory pressure, which this
* code isn't prepared to handle).
*/
break;
case NL80211_IFTYPE_P2P_CLIENT:
p2p = true;
internal_type = NL80211_IFTYPE_STATION;
break;
case NL80211_IFTYPE_P2P_GO:
p2p = true;
internal_type = NL80211_IFTYPE_AP;
break;
default:
return -EBUSY;
}
ret = ieee80211_check_concurrent_iface(sdata, internal_type);
if (ret)
return ret;
ieee80211_do_stop(sdata, false);
ieee80211_teardown_sdata(sdata);
ret = drv_change_interface(local, sdata, internal_type, p2p);
if (ret)
type = sdata->vif.type;
/*
* Ignore return value here, there's not much we can do since
* the driver changed the interface type internally already.
* The warnings will hopefully make driver authors fix it :-)
*/
ieee80211_check_queues(sdata);
ieee80211_setup_sdata(sdata, type);
err = ieee80211_do_open(&sdata->wdev, false);
WARN(err, "type change: do_open returned %d", err);
return ret;
}
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
int ret;
ASSERT_RTNL();
if (type == ieee80211_vif_type_p2p(&sdata->vif))
return 0;
if (ieee80211_sdata_running(sdata)) {
ret = ieee80211_runtime_change_iftype(sdata, type);
if (ret)
return ret;
} else {
/* Purge and reset type-dependent state. */
ieee80211_teardown_sdata(sdata);
ieee80211_setup_sdata(sdata, type);
}
/* reset some values that shouldn't be kept across type changes */
sdata->drop_unencrypted = 0;
if (type == NL80211_IFTYPE_STATION)
sdata->u.mgd.use_4addr = false;
return 0;
}
static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
u8 *perm_addr, enum nl80211_iftype type)
{
struct ieee80211_sub_if_data *sdata;
u64 mask, start, addr, val, inc;
u8 *m;
u8 tmp_addr[ETH_ALEN];
int i;
/* default ... something at least */
memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
local->hw.wiphy->n_addresses <= 1)
return;
mutex_lock(&local->iflist_mtx);
switch (type) {
case NL80211_IFTYPE_MONITOR:
/* doesn't matter */
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
/* match up with an AP interface */
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->vif.type != NL80211_IFTYPE_AP)
continue;
memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
break;
}
/* keep default if no AP interface present */
break;
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
continue;
if (!ieee80211_sdata_running(sdata))
continue;
memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
goto out_unlock;
}
}
/* otherwise fall through */
default:
/* assign a new address if possible -- try n_addresses first */
for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
bool used = false;
list_for_each_entry(sdata, &local->interfaces, list) {
if (memcmp(local->hw.wiphy->addresses[i].addr,
sdata->vif.addr, ETH_ALEN) == 0) {
used = true;
break;
}
}
if (!used) {
memcpy(perm_addr,
local->hw.wiphy->addresses[i].addr,
ETH_ALEN);
break;
}
}
/* try mask if available */
if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
break;
m = local->hw.wiphy->addr_mask;
mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
/* not a contiguous mask ... not handled now! */
pr_info("not contiguous\n");
break;
}
m = local->hw.wiphy->perm_addr;
start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
inc = 1ULL<<__ffs64(mask);
val = (start & mask);
addr = (start & ~mask) | (val & mask);
do {
bool used = false;
tmp_addr[5] = addr >> 0*8;
tmp_addr[4] = addr >> 1*8;
tmp_addr[3] = addr >> 2*8;
tmp_addr[2] = addr >> 3*8;
tmp_addr[1] = addr >> 4*8;
tmp_addr[0] = addr >> 5*8;
val += inc;
list_for_each_entry(sdata, &local->interfaces, list) {
if (memcmp(tmp_addr, sdata->vif.addr,
ETH_ALEN) == 0) {
used = true;
break;
}
}
if (!used) {
memcpy(perm_addr, tmp_addr, ETH_ALEN);
break;
}
addr = (start & ~mask) | (val & mask);
} while (addr != start);
break;
}
out_unlock:
mutex_unlock(&local->iflist_mtx);
}
static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
{
struct ieee80211_sub_if_data *sdata;
sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
ieee80211_cleanup_sdata_stas(sdata);
}
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
struct wireless_dev **new_wdev, enum nl80211_iftype type,
struct vif_params *params)
{
struct net_device *ndev = NULL;
struct ieee80211_sub_if_data *sdata = NULL;
int ret, i;
int txqs = 1;
ASSERT_RTNL();
if (type == NL80211_IFTYPE_P2P_DEVICE) {
struct wireless_dev *wdev;
sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
GFP_KERNEL);
if (!sdata)
return -ENOMEM;
wdev = &sdata->wdev;
sdata->dev = NULL;
strlcpy(sdata->name, name, IFNAMSIZ);
ieee80211_assign_perm_addr(local, wdev->address, type);
memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
} else {
if (local->hw.queues >= IEEE80211_NUM_ACS)
txqs = IEEE80211_NUM_ACS;
ndev = alloc_netdev_mqs(sizeof(*sdata) +
local->hw.vif_data_size,
name, ieee80211_if_setup, txqs, 1);
if (!ndev)
return -ENOMEM;
dev_net_set(ndev, wiphy_net(local->hw.wiphy));
ndev->needed_headroom = local->tx_headroom +
4*6 /* four MAC addresses */
+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
+ 6 /* mesh */
+ 8 /* rfc1042/bridge tunnel */
- ETH_HLEN /* ethernet hard_header_len */
+ IEEE80211_ENCRYPT_HEADROOM;
ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
ret = dev_alloc_name(ndev, ndev->name);
if (ret < 0) {
free_netdev(ndev);
return ret;
}
ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
sdata = netdev_priv(ndev);
ndev->ieee80211_ptr = &sdata->wdev;
memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
memcpy(sdata->name, ndev->name, IFNAMSIZ);
sdata->dev = ndev;
}
/* initialise type-independent data */
sdata->wdev.wiphy = local->hw.wiphy;
sdata->local = local;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
skb_queue_head_init(&sdata->fragments[i].skb_list);
INIT_LIST_HEAD(&sdata->key_list);
spin_lock_init(&sdata->cleanup_stations_lock);
INIT_LIST_HEAD(&sdata->cleanup_stations);
INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
ieee80211_dfs_cac_timer_work);
for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[i];
sdata->rc_rateidx_mask[i] =
sband ? (1 << sband->n_bitrates) - 1 : 0;
if (sband)
memcpy(sdata->rc_rateidx_mcs_mask[i],
sband->ht_cap.mcs.rx_mask,
sizeof(sdata->rc_rateidx_mcs_mask[i]));
else
memset(sdata->rc_rateidx_mcs_mask[i], 0,
sizeof(sdata->rc_rateidx_mcs_mask[i]));
}
ieee80211_set_default_queues(sdata);
sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
sdata->user_power_level = local->user_power_level;
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);
if (ndev) {
if (params) {
ndev->ieee80211_ptr->use_4addr = params->use_4addr;
if (type == NL80211_IFTYPE_STATION)
sdata->u.mgd.use_4addr = params->use_4addr;
}
ndev->features |= local->hw.netdev_features;
ret = register_netdevice(ndev);
if (ret) {
free_netdev(ndev);
return ret;
}
}
mutex_lock(&local->iflist_mtx);
list_add_tail_rcu(&sdata->list, &local->interfaces);
mutex_unlock(&local->iflist_mtx);
if (new_wdev)
*new_wdev = &sdata->wdev;
return 0;
}
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
{
ASSERT_RTNL();
mutex_lock(&sdata->local->iflist_mtx);
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
synchronize_rcu();
if (sdata->dev) {
unregister_netdevice(sdata->dev);
} else {
cfg80211_unregister_wdev(&sdata->wdev);
kfree(sdata);
}
}
void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
{
if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
return;
ieee80211_do_stop(sdata, true);
ieee80211_teardown_sdata(sdata);
}
/*
* Remove all interfaces, may only be called at hardware unregistration
* time because it doesn't do RCU-safe list removals.
*/
void ieee80211_remove_interfaces(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata, *tmp;
LIST_HEAD(unreg_list);
LIST_HEAD(wdev_list);
ASSERT_RTNL();
mutex_lock(&local->iflist_mtx);
list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
list_del(&sdata->list);
if (sdata->dev)
unregister_netdevice_queue(sdata->dev, &unreg_list);
else
list_add(&sdata->list, &wdev_list);
}
mutex_unlock(&local->iflist_mtx);
unregister_netdevice_many(&unreg_list);
list_del(&unreg_list);
list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
list_del(&sdata->list);
cfg80211_unregister_wdev(&sdata->wdev);
kfree(sdata);
}
}
static int netdev_notify(struct notifier_block *nb,
unsigned long state,
void *ndev)
{
struct net_device *dev = ndev;
struct ieee80211_sub_if_data *sdata;
if (state != NETDEV_CHANGENAME)
return 0;
if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
return 0;
if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
return 0;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
memcpy(sdata->name, dev->name, IFNAMSIZ);
ieee80211_debugfs_rename_netdev(sdata);
return 0;
}
static struct notifier_block mac80211_netdev_notifier = {
.notifier_call = netdev_notify,
};
int ieee80211_iface_init(void)
{
return register_netdevice_notifier(&mac80211_netdev_notifier);
}
void ieee80211_iface_exit(void)
{
unregister_netdevice_notifier(&mac80211_netdev_notifier);
}
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