linux/net/mac80211/iface.c
Johannes Berg 5cff20e6c5 mac80211: tell driver when idle
When we aren't doing anything in mac80211, we can turn off
much of the hardware, depending on the driver/hw. Not doing
anything, aka being idle, means:

 * no monitor interfaces
 * no AP/mesh/wds interfaces
 * any station interfaces are in DISABLED state
 * any IBSS interfaces aren't trying to be in a network
 * we aren't trying to scan

By creating a new function that verifies these conditions and calling
it at strategic points where the states of those conditions change,
we can easily make mac80211 tell the driver when we are idle to save
power.

Additionally, this fixes a small quirk where a recalculated powersave
state is passed to the driver even if the hardware is about to stopped
completely.

This patch intentionally doesn't touch radio_enabled because that is
currently implemented to be a soft rfkill which is inappropriate here
when we need to be able to wake up with low latency.

One thing I'm not entirely sure about is this:

  phy0: device no longer idle - in use
  wlan0: direct probe to AP 00:11:24:91:07:4d try 1
  wlan0 direct probe responded
  wlan0: authenticate with AP 00:11:24:91:07:4d
  wlan0: authenticated
> phy0: device now idle
> phy0: device no longer idle - in use
  wlan0: associate with AP 00:11:24:91:07:4d
  wlan0: RX AssocResp from 00:11:24:91:07:4d (capab=0x401 status=0 aid=1)
  wlan0: associated

Is it appropriate to go into idle state for a short time when we have
just authenticated, but not associated yet? This happens only with the
userspace SME, because we cannot really know how long it will wait
before asking us to associate. Would going idle after a short timeout
be more appropriate? We may need to revisit this, depending on what
happens.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-05-06 15:14:51 -04:00

969 lines
26 KiB
C

/*
* 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/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"
#include "mesh.h"
#include "led.h"
#include "driver-ops.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.
*/
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 == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
/* FIX: what would be proper limits for MTU?
* This interface uses 802.3 frames. */
if (new_mtu < 256 ||
new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
return -EINVAL;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return type1 == NL80211_IFTYPE_MONITOR ||
type2 == NL80211_IFTYPE_MONITOR ||
(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_open(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_sub_if_data *nsdata;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
struct ieee80211_if_init_conf conf;
u32 changed = 0;
int res;
u32 hw_reconf_flags = 0;
u8 null_addr[ETH_ALEN] = {0};
/* fail early if user set an invalid address */
if (compare_ether_addr(dev->dev_addr, null_addr) &&
!is_valid_ether_addr(dev->dev_addr))
return -EADDRNOTAVAIL;
/* we hold the RTNL here so can safely walk the list */
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
if (ndev != dev && netif_running(ndev)) {
/*
* Allow only a single IBSS interface to be up at any
* time. This is restricted because beacon distribution
* cannot work properly if both are in the same IBSS.
*
* To remove this restriction we'd have to disallow them
* from setting the same SSID on different IBSS interfaces
* belonging to the same hardware. Then, however, we're
* faced with having to adopt two different TSF timers...
*/
if (sdata->vif.type == 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 (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 == NL80211_IFTYPE_AP_VLAN &&
nsdata->vif.type == NL80211_IFTYPE_AP)
sdata->bss = &nsdata->u.ap;
}
}
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:
if (!sdata->bss)
return -ENOLINK;
list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
break;
case NL80211_IFTYPE_AP:
sdata->bss = &sdata->u.ap;
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
/* mesh ifaces must set allmulti to forward mcast traffic */
atomic_inc(&local->iff_allmultis);
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_ADHOC:
/* no special treatment */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
/* cannot happen */
WARN_ON(1);
break;
}
if (local->open_count == 0) {
res = drv_start(local);
if (res)
goto err_del_bss;
/* we're brought up, everything changes */
hw_reconf_flags = ~0;
ieee80211_led_radio(local, local->hw.conf.radio_enabled);
}
/*
* Check all interfaces and copy the hopefully now-present
* MAC address to those that have the special null one.
*/
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
/*
* No need to check netif_running since we do not allow
* it to start up with this invalid address.
*/
if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
memcpy(ndev->dev_addr,
local->hw.wiphy->perm_addr,
ETH_ALEN);
}
if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
ETH_ALEN);
/*
* Validate the MAC address for this device.
*/
if (!is_valid_ether_addr(dev->dev_addr)) {
if (!local->open_count)
drv_stop(local);
return -EADDRNOTAVAIL;
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
/* no need to tell driver */
break;
case NL80211_IFTYPE_MONITOR:
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;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
local->fif_control++;
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss++;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
break;
case NL80211_IFTYPE_STATION:
sdata->u.mgd.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 = drv_add_interface(local, &conf);
if (res)
goto err_stop;
if (ieee80211_vif_is_mesh(&sdata->vif)) {
local->fif_other_bss++;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
ieee80211_start_mesh(sdata);
}
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_bss_info_change_notify(sdata, changed);
ieee80211_enable_keys(sdata);
if (sdata->vif.type == NL80211_IFTYPE_STATION)
netif_carrier_off(dev);
else
netif_carrier_on(dev);
}
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;
}
/* no locking required since STA is not live yet */
sta->flags |= WLAN_STA_AUTHORIZED;
res = sta_info_insert(sta);
if (res) {
/* STA has been freed */
goto err_del_interface;
}
}
if (local->open_count == 0) {
res = dev_open(local->mdev);
WARN_ON(res);
if (res)
goto err_del_interface;
tasklet_enable(&local->tx_pending_tasklet);
tasklet_enable(&local->tasklet);
}
/*
* set_multicast_list will be invoked by the networking core
* which will check whether any increments here were done in
* error and sync them down to the hardware as filter flags.
*/
if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
atomic_inc(&local->iff_allmultis);
if (sdata->flags & IEEE80211_SDATA_PROMISC)
atomic_inc(&local->iff_promiscs);
hw_reconf_flags |= __ieee80211_recalc_idle(local);
local->open_count++;
if (hw_reconf_flags) {
ieee80211_hw_config(local, hw_reconf_flags);
/*
* set default queue parameters so drivers don't
* need to initialise the hardware if the hardware
* doesn't start up with sane defaults
*/
ieee80211_set_wmm_default(sdata);
}
ieee80211_recalc_ps(local, -1);
/*
* 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 == NL80211_IFTYPE_STATION)
queue_work(local->hw.workqueue, &sdata->u.mgd.work);
netif_tx_start_all_queues(dev);
return 0;
err_del_interface:
drv_remove_interface(local, &conf);
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);
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;
u32 hw_reconf_flags = 0;
/*
* Stop TX on this interface first.
*/
netif_tx_stop_all_queues(dev);
/*
* Now delete all active aggregation sessions.
*/
rcu_read_lock();
list_for_each_entry_rcu(sta, &local->sta_list, list) {
if (sta->sdata == sdata)
ieee80211_sta_tear_down_BA_sessions(sta);
}
rcu_read_unlock();
/*
* Announce that we are leaving the network, in case we are a
* station interface type. This must be done before removing
* all stations associated with sta_info_flush, otherwise STA
* information will be gone and no announce being done.
*/
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
ieee80211_sta_deauthenticate(sdata,
WLAN_REASON_DEAUTH_LEAVING);
}
/*
* 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);
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
/* APs need special treatment */
if (sdata->vif.type == NL80211_IFTYPE_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 NL80211_IFTYPE_AP_VLAN:
list_del(&sdata->u.vlan.list);
/* 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_RADIOTAP;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
local->fif_control--;
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss--;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
break;
case NL80211_IFTYPE_STATION:
memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
del_timer_sync(&sdata->u.mgd.chswitch_timer);
del_timer_sync(&sdata->u.mgd.timer);
/*
* If the timer fired while we waited for it, it will have
* requeued the work. Now the work will be running again
* but will not rearm the timer again because it checks
* whether the interface is running, which, at this point,
* it no longer is.
*/
cancel_work_sync(&sdata->u.mgd.work);
cancel_work_sync(&sdata->u.mgd.chswitch_work);
cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
/*
* When we get here, the interface is marked down.
* Call synchronize_rcu() to wait for the RX path
* should it be using the interface and enqueuing
* frames at this very time on another CPU.
*/
synchronize_rcu();
skb_queue_purge(&sdata->u.mgd.skb_queue);
sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
IEEE80211_STA_TKIP_WEP_USED);
kfree(sdata->u.mgd.extra_ie);
sdata->u.mgd.extra_ie = NULL;
sdata->u.mgd.extra_ie_len = 0;
/* fall through */
case NL80211_IFTYPE_ADHOC:
if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
del_timer_sync(&sdata->u.ibss.timer);
cancel_work_sync(&sdata->u.ibss.work);
synchronize_rcu();
skb_queue_purge(&sdata->u.ibss.skb_queue);
}
/* fall through */
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif)) {
/* other_bss and allmulti are always set on mesh
* ifaces */
local->fif_other_bss--;
atomic_dec(&local->iff_allmultis);
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
ieee80211_stop_mesh(sdata);
}
/* fall through */
default:
if (local->scan_sdata == sdata) {
if (!local->ops->hw_scan)
cancel_delayed_work_sync(&local->scan_work);
/*
* The software scan can no longer run now, so we can
* clear out the scan_sdata reference. However, the
* hardware scan may still be running. The complete
* function must be prepared to handle a NULL value.
*/
local->scan_sdata = NULL;
/*
* The memory barrier guarantees that another CPU
* that is hardware-scanning will now see the fact
* that this interface is gone.
*/
smp_mb();
/*
* If software scanning, complete the scan but since
* the scan_sdata is NULL already don't send out a
* scan event to userspace -- the scan is incomplete.
*/
if (local->sw_scanning)
ieee80211_scan_completed(&local->hw, true);
}
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);
drv_remove_interface(local, &conf);
}
sdata->bss = NULL;
hw_reconf_flags |= __ieee80211_recalc_idle(local);
ieee80211_recalc_ps(local, -1);
if (local->open_count == 0) {
if (netif_running(local->mdev))
dev_close(local->mdev);
drv_stop(local);
ieee80211_led_radio(local, 0);
flush_workqueue(local->hw.workqueue);
tasklet_disable(&local->tx_pending_tasklet);
tasklet_disable(&local->tasklet);
/* 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);
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;
}
dev_mc_sync(local->mdev, dev);
}
/*
* Called when the netdev is removed or, by the code below, before
* the interface type changes.
*/
static void ieee80211_teardown_sdata(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct beacon_data *beacon;
struct sk_buff *skb;
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;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
beacon = sdata->u.ap.beacon;
rcu_assign_pointer(sdata->u.ap.beacon, NULL);
synchronize_rcu();
kfree(beacon);
while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
local->total_ps_buffered--;
dev_kfree_skb(skb);
}
break;
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_rmc_free(sdata);
break;
case NL80211_IFTYPE_ADHOC:
if (WARN_ON(sdata->u.ibss.presp))
kfree_skb(sdata->u.ibss.presp);
break;
case NL80211_IFTYPE_STATION:
kfree(sdata->u.mgd.extra_ie);
kfree(sdata->u.mgd.assocreq_ies);
kfree(sdata->u.mgd.assocresp_ies);
kfree(sdata->u.mgd.sme_auth_ie);
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_MONITOR:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
BUG();
break;
}
flushed = sta_info_flush(local, sdata);
WARN_ON(flushed);
}
static const struct net_device_ops ieee80211_dataif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_teardown_sdata,
.ndo_start_xmit = ieee80211_subif_start_xmit,
.ndo_set_multicast_list = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
};
static const struct net_device_ops ieee80211_monitorif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_teardown_sdata,
.ndo_start_xmit = ieee80211_monitor_start_xmit,
.ndo_set_multicast_list = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
};
static void ieee80211_if_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &ieee80211_dataif_ops;
dev->wireless_handlers = &ieee80211_iw_handler_def;
dev->destructor = free_netdev;
}
/*
* 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->dev->netdev_ops = &ieee80211_dataif_ops;
sdata->wdev.iftype = type;
/* only monitor differs */
sdata->dev->type = ARPHRD_ETHER;
switch (type) {
case NL80211_IFTYPE_AP:
skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
INIT_LIST_HEAD(&sdata->u.ap.vlans);
break;
case NL80211_IFTYPE_STATION:
ieee80211_sta_setup_sdata(sdata);
break;
case NL80211_IFTYPE_ADHOC:
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:
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
BUG();
break;
}
ieee80211_debugfs_add_netdev(sdata);
}
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
ASSERT_RTNL();
if (type == sdata->vif.type)
return 0;
/* Setting ad-hoc mode on non-IBSS channel is not supported. */
if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
type == NL80211_IFTYPE_ADHOC)
return -EOPNOTSUPP;
/*
* We could, here, on changes between IBSS/STA/MESH modes,
* invoke an MLME function instead that disassociates etc.
* and goes into the requested mode.
*/
if (netif_running(sdata->dev))
return -EBUSY;
/* Purge and reset type-dependent state. */
ieee80211_teardown_sdata(sdata->dev);
ieee80211_setup_sdata(sdata, type);
/* reset some values that shouldn't be kept across type changes */
sdata->vif.bss_conf.basic_rates =
ieee80211_mandatory_rates(sdata->local,
sdata->local->hw.conf.channel->band);
sdata->drop_unencrypted = 0;
return 0;
}
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
struct net_device **new_dev, enum nl80211_iftype type,
struct vif_params *params)
{
struct net_device *ndev;
struct ieee80211_sub_if_data *sdata = NULL;
int ret, i;
ASSERT_RTNL();
ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
name, ieee80211_if_setup);
if (!ndev)
return -ENOMEM;
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)
goto fail;
memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
ndev->features |= NETIF_F_NETNS_LOCAL;
/* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
sdata = netdev_priv(ndev);
ndev->ieee80211_ptr = &sdata->wdev;
/* initialise type-independent data */
sdata->wdev.wiphy = local->hw.wiphy;
sdata->local = local;
sdata->dev = ndev;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
skb_queue_head_init(&sdata->fragments[i].skb_list);
INIT_LIST_HEAD(&sdata->key_list);
sdata->force_unicast_rateidx = -1;
sdata->max_ratectrl_rateidx = -1;
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);
ret = register_netdevice(ndev);
if (ret)
goto fail;
if (ieee80211_vif_is_mesh(&sdata->vif) &&
params && params->mesh_id_len)
ieee80211_sdata_set_mesh_id(sdata,
params->mesh_id_len,
params->mesh_id);
mutex_lock(&local->iflist_mtx);
list_add_tail_rcu(&sdata->list, &local->interfaces);
mutex_unlock(&local->iflist_mtx);
if (new_dev)
*new_dev = ndev;
return 0;
fail:
free_netdev(ndev);
return ret;
}
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();
unregister_netdevice(sdata->dev);
}
/*
* 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;
ASSERT_RTNL();
list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
/*
* we cannot hold the iflist_mtx across unregister_netdevice,
* but we only need to hold it for list modifications to lock
* out readers since we're under the RTNL here as all other
* writers.
*/
mutex_lock(&local->iflist_mtx);
list_del(&sdata->list);
mutex_unlock(&local->iflist_mtx);
unregister_netdevice(sdata->dev);
}
}
static u32 ieee80211_idle_off(struct ieee80211_local *local,
const char *reason)
{
if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
return 0;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: device no longer idle - %s\n",
wiphy_name(local->hw.wiphy), reason);
#endif
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;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: device now idle\n",
wiphy_name(local->hw.wiphy));
#endif
local->hw.conf.flags |= IEEE80211_CONF_IDLE;
return IEEE80211_CONF_CHANGE_IDLE;
}
u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
int count = 0;
if (local->hw_scanning || local->sw_scanning)
return ieee80211_idle_off(local, "scanning");
list_for_each_entry(sdata, &local->interfaces, list) {
if (!netif_running(sdata->dev))
continue;
/* do not count disabled managed interfaces */
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
sdata->u.mgd.state == IEEE80211_STA_MLME_DISABLED)
continue;
/* do not count unused IBSS interfaces */
if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
!sdata->u.ibss.ssid_len)
continue;
/* count everything else */
count++;
}
if (!count)
return ieee80211_idle_on(local);
else
return ieee80211_idle_off(local, "in use");
return 0;
}
void ieee80211_recalc_idle(struct ieee80211_local *local)
{
u32 chg;
mutex_lock(&local->iflist_mtx);
chg = __ieee80211_recalc_idle(local);
mutex_unlock(&local->iflist_mtx);
ieee80211_hw_config(local, chg);
}