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linux/net/mac80211/main.c
Eliad Peller 2bc533bd9d mac80211: handle sched_scan_stopped vs. hw restart race 
On hw restart, mac80211 might try to reconfigure already
stopped sched scan, if ieee80211_sched_scan_stopped_work()
wasn't scheduled yet.

This in turn will keep the device driver with scheduled scan
configured, while both mac80211 and cfg80211 will clear
their sched scan state once the work is scheduled.

Fix it by ignoring ieee80211_sched_scan_stopped() calls
while in hw restart, and flush the work before starting
the reconfiguration.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-01-14 11:10:20 +01:00

1259 lines
34 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>
* Copyright 2013-2014 Intel Mobile Communications GmbH
*
* 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 <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/rtnetlink.h>
#include <linux/bitmap.h>
#include <linux/inetdevice.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>
#include <net/addrconf.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "mesh.h"
#include "wep.h"
#include "led.h"
#include "debugfs.h"
void ieee80211_configure_filter(struct ieee80211_local *local)
{
u64 mc;
unsigned int changed_flags;
unsigned int new_flags = 0;
if (atomic_read(&local->iff_allmultis))
new_flags |= FIF_ALLMULTI;
if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
new_flags |= FIF_BCN_PRBRESP_PROMISC;
if (local->fif_probe_req || local->probe_req_reg)
new_flags |= FIF_PROBE_REQ;
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;
if (local->fif_pspoll)
new_flags |= FIF_PSPOLL;
spin_lock_bh(&local->filter_lock);
changed_flags = local->filter_flags ^ new_flags;
mc = drv_prepare_multicast(local, &local->mc_list);
spin_unlock_bh(&local->filter_lock);
/* be a bit nasty */
new_flags |= (1<<31);
drv_configure_filter(local, changed_flags, &new_flags, mc);
WARN_ON(new_flags & (1<<31));
local->filter_flags = new_flags & ~(1<<31);
}
static void ieee80211_reconfig_filter(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, reconfig_filter);
ieee80211_configure_filter(local);
}
static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
struct cfg80211_chan_def chandef = {};
u32 changed = 0;
int power;
u32 offchannel_flag;
offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
if (local->scan_chandef.chan) {
chandef = local->scan_chandef;
} else if (local->tmp_channel) {
chandef.chan = local->tmp_channel;
chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
chandef.center_freq1 = chandef.chan->center_freq;
} else
chandef = local->_oper_chandef;
WARN(!cfg80211_chandef_valid(&chandef),
"control:%d MHz width:%d center: %d/%d MHz",
chandef.chan->center_freq, chandef.width,
chandef.center_freq1, chandef.center_freq2);
if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
else
local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
if (offchannel_flag ||
!cfg80211_chandef_identical(&local->hw.conf.chandef,
&local->_oper_chandef)) {
local->hw.conf.chandef = chandef;
changed |= IEEE80211_CONF_CHANGE_CHANNEL;
}
if (!conf_is_ht(&local->hw.conf)) {
/*
* mac80211.h documents that this is only valid
* when the channel is set to an HT type, and
* that otherwise STATIC is used.
*/
local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
} else if (local->hw.conf.smps_mode != local->smps_mode) {
local->hw.conf.smps_mode = local->smps_mode;
changed |= IEEE80211_CONF_CHANGE_SMPS;
}
power = ieee80211_chandef_max_power(&chandef);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!rcu_access_pointer(sdata->vif.chanctx_conf))
continue;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
continue;
power = min(power, sdata->vif.bss_conf.txpower);
}
rcu_read_unlock();
if (local->hw.conf.power_level != power) {
changed |= IEEE80211_CONF_CHANGE_POWER;
local->hw.conf.power_level = power;
}
return changed;
}
int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
{
int ret = 0;
might_sleep();
if (!local->use_chanctx)
changed |= ieee80211_hw_conf_chan(local);
else
changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
IEEE80211_CONF_CHANGE_POWER);
if (changed && local->open_count) {
ret = drv_config(local, changed);
/*
* Goal:
* HW reconfiguration should never fail, the driver has told
* us what it can support so it should live up to that promise.
*
* Current status:
* rfkill is not integrated with mac80211 and a
* configuration command can thus fail if hardware rfkill
* is enabled
*
* FIXME: integrate rfkill with mac80211 and then add this
* WARN_ON() back
*
*/
/* WARN_ON(ret); */
}
return ret;
}
void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
u32 changed)
{
struct ieee80211_local *local = sdata->local;
if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
return;
drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
}
u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
{
sdata->vif.bss_conf.use_cts_prot = false;
sdata->vif.bss_conf.use_short_preamble = false;
sdata->vif.bss_conf.use_short_slot = false;
return BSS_CHANGED_ERP_CTS_PROT |
BSS_CHANGED_ERP_PREAMBLE |
BSS_CHANGED_ERP_SLOT;
}
static void ieee80211_tasklet_handler(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sk_buff *skb;
while ((skb = skb_dequeue(&local->skb_queue)) ||
(skb = skb_dequeue(&local->skb_queue_unreliable))) {
switch (skb->pkt_type) {
case IEEE80211_RX_MSG:
/* Clear skb->pkt_type in order to not confuse kernel
* netstack. */
skb->pkt_type = 0;
ieee80211_rx(&local->hw, skb);
break;
case IEEE80211_TX_STATUS_MSG:
skb->pkt_type = 0;
ieee80211_tx_status(&local->hw, skb);
break;
default:
WARN(1, "mac80211: Packet is of unknown type %d\n",
skb->pkt_type);
dev_kfree_skb(skb);
break;
}
}
}
static void ieee80211_restart_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, restart_work);
struct ieee80211_sub_if_data *sdata;
/* wait for scan work complete */
flush_workqueue(local->workqueue);
flush_work(&local->sched_scan_stopped_work);
WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
"%s called with hardware scan in progress\n", __func__);
rtnl_lock();
list_for_each_entry(sdata, &local->interfaces, list)
flush_delayed_work(&sdata->dec_tailroom_needed_wk);
ieee80211_scan_cancel(local);
/* make sure any new ROC will consider local->in_reconfig */
flush_delayed_work(&local->roc_work);
flush_work(&local->hw_roc_done);
ieee80211_reconfig(local);
rtnl_unlock();
}
void ieee80211_restart_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
trace_api_restart_hw(local);
wiphy_info(hw->wiphy,
"Hardware restart was requested\n");
/* use this reason, ieee80211_reconfig will unblock it */
ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
IEEE80211_QUEUE_STOP_REASON_SUSPEND,
false);
/*
* Stop all Rx during the reconfig. We don't want state changes
* or driver callbacks while this is in progress.
*/
local->in_reconfig = true;
barrier();
queue_work(system_freezable_wq, &local->restart_work);
}
EXPORT_SYMBOL(ieee80211_restart_hw);
#ifdef CONFIG_INET
static int ieee80211_ifa_changed(struct notifier_block *nb,
unsigned long data, void *arg)
{
struct in_ifaddr *ifa = arg;
struct ieee80211_local *local =
container_of(nb, struct ieee80211_local,
ifa_notifier);
struct net_device *ndev = ifa->ifa_dev->dev;
struct wireless_dev *wdev = ndev->ieee80211_ptr;
struct in_device *idev;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_bss_conf *bss_conf;
struct ieee80211_if_managed *ifmgd;
int c = 0;
/* Make sure it's our interface that got changed */
if (!wdev)
return NOTIFY_DONE;
if (wdev->wiphy != local->hw.wiphy)
return NOTIFY_DONE;
sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
bss_conf = &sdata->vif.bss_conf;
/* ARP filtering is only supported in managed mode */
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return NOTIFY_DONE;
idev = __in_dev_get_rtnl(sdata->dev);
if (!idev)
return NOTIFY_DONE;
ifmgd = &sdata->u.mgd;
sdata_lock(sdata);
/* Copy the addresses to the bss_conf list */
ifa = idev->ifa_list;
while (ifa) {
if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
bss_conf->arp_addr_list[c] = ifa->ifa_address;
ifa = ifa->ifa_next;
c++;
}
bss_conf->arp_addr_cnt = c;
/* Configure driver only if associated (which also implies it is up) */
if (ifmgd->associated)
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_ARP_FILTER);
sdata_unlock(sdata);
return NOTIFY_OK;
}
#endif
#if IS_ENABLED(CONFIG_IPV6)
static int ieee80211_ifa6_changed(struct notifier_block *nb,
unsigned long data, void *arg)
{
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
struct inet6_dev *idev = ifa->idev;
struct net_device *ndev = ifa->idev->dev;
struct ieee80211_local *local =
container_of(nb, struct ieee80211_local, ifa6_notifier);
struct wireless_dev *wdev = ndev->ieee80211_ptr;
struct ieee80211_sub_if_data *sdata;
/* Make sure it's our interface that got changed */
if (!wdev || wdev->wiphy != local->hw.wiphy)
return NOTIFY_DONE;
sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
/*
* For now only support station mode. This is mostly because
* doing AP would have to handle AP_VLAN in some way ...
*/
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return NOTIFY_DONE;
drv_ipv6_addr_change(local, sdata, idev);
return NOTIFY_OK;
}
#endif
/* There isn't a lot of sense in it, but you can transmit anything you like */
static const struct ieee80211_txrx_stypes
ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
[NL80211_IFTYPE_ADHOC] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
},
[NL80211_IFTYPE_STATION] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
},
[NL80211_IFTYPE_AP] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
BIT(IEEE80211_STYPE_DISASSOC >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4) |
BIT(IEEE80211_STYPE_ACTION >> 4),
},
[NL80211_IFTYPE_AP_VLAN] = {
/* copy AP */
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
BIT(IEEE80211_STYPE_DISASSOC >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4) |
BIT(IEEE80211_STYPE_ACTION >> 4),
},
[NL80211_IFTYPE_P2P_CLIENT] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
},
[NL80211_IFTYPE_P2P_GO] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
BIT(IEEE80211_STYPE_DISASSOC >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4) |
BIT(IEEE80211_STYPE_ACTION >> 4),
},
[NL80211_IFTYPE_MESH_POINT] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4),
},
[NL80211_IFTYPE_P2P_DEVICE] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
},
};
static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
IEEE80211_HT_AMPDU_PARM_DENSITY,
.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
IEEE80211_HT_CAP_MAX_AMSDU |
IEEE80211_HT_CAP_SGI_20 |
IEEE80211_HT_CAP_SGI_40 |
IEEE80211_HT_CAP_LDPC_CODING |
IEEE80211_HT_CAP_40MHZ_INTOLERANT),
.mcs = {
.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, },
},
};
static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
.vht_cap_info =
cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
IEEE80211_VHT_CAP_SHORT_GI_80 |
IEEE80211_VHT_CAP_SHORT_GI_160 |
IEEE80211_VHT_CAP_RXSTBC_1 |
IEEE80211_VHT_CAP_RXSTBC_2 |
IEEE80211_VHT_CAP_RXSTBC_3 |
IEEE80211_VHT_CAP_RXSTBC_4 |
IEEE80211_VHT_CAP_TXSTBC |
IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
.supp_mcs = {
.rx_mcs_map = cpu_to_le16(~0),
.tx_mcs_map = cpu_to_le16(~0),
},
};
struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
const struct ieee80211_ops *ops,
const char *requested_name)
{
struct ieee80211_local *local;
int priv_size, i;
struct wiphy *wiphy;
bool use_chanctx;
if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
!ops->add_interface || !ops->remove_interface ||
!ops->configure_filter))
return NULL;
if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
return NULL;
/* check all or no channel context operations exist */
i = !!ops->add_chanctx + !!ops->remove_chanctx +
!!ops->change_chanctx + !!ops->assign_vif_chanctx +
!!ops->unassign_vif_chanctx;
if (WARN_ON(i != 0 && i != 5))
return NULL;
use_chanctx = i == 5;
/* 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 = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
if (!wiphy)
return NULL;
wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
wiphy->privid = mac80211_wiphy_privid;
wiphy->flags |= WIPHY_FLAG_NETNS_OK |
WIPHY_FLAG_4ADDR_AP |
WIPHY_FLAG_4ADDR_STATION |
WIPHY_FLAG_REPORTS_OBSS |
WIPHY_FLAG_OFFCHAN_TX;
if (ops->remain_on_channel)
wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
NL80211_FEATURE_SAE |
NL80211_FEATURE_HT_IBSS |
NL80211_FEATURE_VIF_TXPOWER |
NL80211_FEATURE_MAC_ON_CREATE |
NL80211_FEATURE_USERSPACE_MPM |
NL80211_FEATURE_FULL_AP_CLIENT_STATE;
if (!ops->hw_scan)
wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
NL80211_FEATURE_AP_SCAN;
if (!ops->set_key)
wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
local = wiphy_priv(wiphy);
if (sta_info_init(local))
goto err_free;
local->hw.wiphy = wiphy;
local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
local->ops = ops;
local->use_chanctx = use_chanctx;
/* set up some defaults */
local->hw.queues = 1;
local->hw.max_rates = 1;
local->hw.max_report_rates = 0;
local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
IEEE80211_RADIOTAP_MCS_HAVE_GI |
IEEE80211_RADIOTAP_MCS_HAVE_BW;
local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
wiphy->extended_capabilities = local->ext_capa;
wiphy->extended_capabilities_mask = local->ext_capa;
wiphy->extended_capabilities_len =
ARRAY_SIZE(local->ext_capa);
INIT_LIST_HEAD(&local->interfaces);
__hw_addr_init(&local->mc_list);
mutex_init(&local->iflist_mtx);
mutex_init(&local->mtx);
mutex_init(&local->key_mtx);
spin_lock_init(&local->filter_lock);
spin_lock_init(&local->rx_path_lock);
spin_lock_init(&local->queue_stop_reason_lock);
INIT_LIST_HEAD(&local->chanctx_list);
mutex_init(&local->chanctx_mtx);
INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
INIT_WORK(&local->restart_work, ieee80211_restart_work);
INIT_WORK(&local->radar_detected_work,
ieee80211_dfs_radar_detected_work);
INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
local->smps_mode = IEEE80211_SMPS_OFF;
INIT_WORK(&local->dynamic_ps_enable_work,
ieee80211_dynamic_ps_enable_work);
INIT_WORK(&local->dynamic_ps_disable_work,
ieee80211_dynamic_ps_disable_work);
setup_timer(&local->dynamic_ps_timer,
ieee80211_dynamic_ps_timer, (unsigned long) local);
INIT_WORK(&local->sched_scan_stopped_work,
ieee80211_sched_scan_stopped_work);
INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
spin_lock_init(&local->ack_status_lock);
idr_init(&local->ack_status_frames);
for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
skb_queue_head_init(&local->pending[i]);
atomic_set(&local->agg_queue_stop[i], 0);
}
tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
(unsigned long)local);
tasklet_init(&local->tasklet,
ieee80211_tasklet_handler,
(unsigned long) local);
skb_queue_head_init(&local->skb_queue);
skb_queue_head_init(&local->skb_queue_unreliable);
skb_queue_head_init(&local->skb_queue_tdls_chsw);
ieee80211_alloc_led_names(local);
ieee80211_roc_setup(local);
return &local->hw;
err_free:
wiphy_free(wiphy);
return NULL;
}
EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
{
bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
IS_ERR(local->wep_rx_tfm));
bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
int n_suites = 0, r = 0, w = 0;
u32 *suites;
static const u32 cipher_suites[] = {
/* keep WEP first, it may be removed below */
WLAN_CIPHER_SUITE_WEP40,
WLAN_CIPHER_SUITE_WEP104,
WLAN_CIPHER_SUITE_TKIP,
WLAN_CIPHER_SUITE_CCMP,
WLAN_CIPHER_SUITE_CCMP_256,
WLAN_CIPHER_SUITE_GCMP,
WLAN_CIPHER_SUITE_GCMP_256,
/* keep last -- depends on hw flags! */
WLAN_CIPHER_SUITE_AES_CMAC,
WLAN_CIPHER_SUITE_BIP_CMAC_256,
WLAN_CIPHER_SUITE_BIP_GMAC_128,
WLAN_CIPHER_SUITE_BIP_GMAC_256,
};
if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
local->hw.wiphy->cipher_suites) {
/* If the driver advertises, or doesn't support SW crypto,
* we only need to remove WEP if necessary.
*/
if (have_wep)
return 0;
/* well if it has _no_ ciphers ... fine */
if (!local->hw.wiphy->n_cipher_suites)
return 0;
/* Driver provides cipher suites, but we need to exclude WEP */
suites = kmemdup(local->hw.wiphy->cipher_suites,
sizeof(u32) * local->hw.wiphy->n_cipher_suites,
GFP_KERNEL);
if (!suites)
return -ENOMEM;
for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
u32 suite = local->hw.wiphy->cipher_suites[r];
if (suite == WLAN_CIPHER_SUITE_WEP40 ||
suite == WLAN_CIPHER_SUITE_WEP104)
continue;
suites[w++] = suite;
}
} else if (!local->hw.cipher_schemes) {
/* If the driver doesn't have cipher schemes, there's nothing
* else to do other than assign the (software supported and
* perhaps offloaded) cipher suites.
*/
local->hw.wiphy->cipher_suites = cipher_suites;
local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
if (!have_mfp)
local->hw.wiphy->n_cipher_suites -= 4;
if (!have_wep) {
local->hw.wiphy->cipher_suites += 2;
local->hw.wiphy->n_cipher_suites -= 2;
}
/* not dynamically allocated, so just return */
return 0;
} else {
const struct ieee80211_cipher_scheme *cs;
cs = local->hw.cipher_schemes;
/* Driver specifies cipher schemes only (but not cipher suites
* including the schemes)
*
* We start counting ciphers defined by schemes, TKIP, CCMP,
* CCMP-256, GCMP, and GCMP-256
*/
n_suites = local->hw.n_cipher_schemes + 5;
/* check if we have WEP40 and WEP104 */
if (have_wep)
n_suites += 2;
/* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
* BIP-GMAC-256
*/
if (have_mfp)
n_suites += 4;
suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
if (!suites)
return -ENOMEM;
suites[w++] = WLAN_CIPHER_SUITE_CCMP;
suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
suites[w++] = WLAN_CIPHER_SUITE_TKIP;
suites[w++] = WLAN_CIPHER_SUITE_GCMP;
suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
if (have_wep) {
suites[w++] = WLAN_CIPHER_SUITE_WEP40;
suites[w++] = WLAN_CIPHER_SUITE_WEP104;
}
if (have_mfp) {
suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
}
for (r = 0; r < local->hw.n_cipher_schemes; r++) {
suites[w++] = cs[r].cipher;
if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
kfree(suites);
return -EINVAL;
}
}
}
local->hw.wiphy->cipher_suites = suites;
local->hw.wiphy->n_cipher_suites = w;
local->wiphy_ciphers_allocated = true;
return 0;
}
int ieee80211_register_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
int result, i;
enum ieee80211_band band;
int channels, max_bitrates;
bool supp_ht, supp_vht;
netdev_features_t feature_whitelist;
struct cfg80211_chan_def dflt_chandef = {};
if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
(local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
local->hw.offchannel_tx_hw_queue >= local->hw.queues))
return -EINVAL;
if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
(!local->ops->tdls_channel_switch ||
!local->ops->tdls_cancel_channel_switch ||
!local->ops->tdls_recv_channel_switch))
return -EOPNOTSUPP;
#ifdef CONFIG_PM
if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
return -EINVAL;
#endif
if (!local->use_chanctx) {
for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
const struct ieee80211_iface_combination *comb;
comb = &local->hw.wiphy->iface_combinations[i];
if (comb->num_different_channels > 1)
return -EINVAL;
}
} else {
/*
* WDS is currently prohibited when channel contexts are used
* because there's no clear definition of which channel WDS
* type interfaces use
*/
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
return -EINVAL;
/* DFS is not supported with multi-channel combinations yet */
for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
const struct ieee80211_iface_combination *comb;
comb = &local->hw.wiphy->iface_combinations[i];
if (comb->radar_detect_widths &&
comb->num_different_channels > 1)
return -EINVAL;
}
}
/* Only HW csum features are currently compatible with mac80211 */
feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
NETIF_F_GSO_SOFTWARE;
if (WARN_ON(hw->netdev_features & ~feature_whitelist))
return -EINVAL;
if (hw->max_report_rates == 0)
hw->max_report_rates = hw->max_rates;
local->rx_chains = 1;
/*
* generic code guarantees at least one band,
* set this very early because much code assumes
* that hw.conf.channel is assigned
*/
channels = 0;
max_bitrates = 0;
supp_ht = false;
supp_vht = false;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[band];
if (!sband)
continue;
if (!dflt_chandef.chan) {
cfg80211_chandef_create(&dflt_chandef,
&sband->channels[0],
NL80211_CHAN_NO_HT);
/* init channel we're on */
if (!local->use_chanctx && !local->_oper_chandef.chan) {
local->hw.conf.chandef = dflt_chandef;
local->_oper_chandef = dflt_chandef;
}
local->monitor_chandef = dflt_chandef;
}
channels += sband->n_channels;
if (max_bitrates < sband->n_bitrates)
max_bitrates = sband->n_bitrates;
supp_ht = supp_ht || sband->ht_cap.ht_supported;
supp_vht = supp_vht || sband->vht_cap.vht_supported;
if (sband->ht_cap.ht_supported)
local->rx_chains =
max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
local->rx_chains);
/* TODO: consider VHT for RX chains, hopefully it's the same */
}
/* if low-level driver supports AP, we also support VLAN */
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
}
/* mac80211 always supports monitor */
hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
/* mac80211 doesn't support more than one IBSS interface right now */
for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
const struct ieee80211_iface_combination *c;
int j;
c = &hw->wiphy->iface_combinations[i];
for (j = 0; j < c->n_limits; j++)
if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
c->limits[j].max > 1)
return -EINVAL;
}
local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
sizeof(void *) * channels, GFP_KERNEL);
if (!local->int_scan_req)
return -ENOMEM;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!local->hw.wiphy->bands[band])
continue;
local->int_scan_req->rates[band] = (u32) -1;
}
#ifndef CONFIG_MAC80211_MESH
/* mesh depends on Kconfig, but drivers should set it if they want */
local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
#endif
/* if the underlying driver supports mesh, mac80211 will (at least)
* provide routing of mesh authentication frames to userspace */
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
/* mac80211 supports control port protocol changing */
local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
} else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
if (hw->max_signal <= 0) {
result = -EINVAL;
goto fail_wiphy_register;
}
}
/*
* Calculate scan IE length -- we need this to alloc
* memory and to subtract from the driver limit. It
* includes the DS Params, (extended) supported rates, and HT
* information -- SSID is the driver's responsibility.
*/
local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
3 /* DS Params */;
if (supp_ht)
local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
if (supp_vht)
local->scan_ies_len +=
2 + sizeof(struct ieee80211_vht_cap);
if (!local->ops->hw_scan) {
/* For hw_scan, driver needs to set these up. */
local->hw.wiphy->max_scan_ssids = 4;
local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
}
/*
* If the driver supports any scan IEs, then assume the
* limit includes the IEs mac80211 will add, otherwise
* leave it at zero and let the driver sort it out; we
* still pass our IEs to the driver but userspace will
* not be allowed to in that case.
*/
if (local->hw.wiphy->max_scan_ie_len)
local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
local->hw.n_cipher_schemes));
result = ieee80211_init_cipher_suites(local);
if (result < 0)
goto fail_wiphy_register;
if (!local->ops->remain_on_channel)
local->hw.wiphy->max_remain_on_channel_duration = 5000;
/* mac80211 based drivers don't support internal TDLS setup */
if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
/* mac80211 supports eCSA, if the driver supports STA CSA at all */
if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
result = wiphy_register(local->hw.wiphy);
if (result < 0)
goto fail_wiphy_register;
/*
* We use the number of queues for feature tests (QoS, HT) internally
* so restrict them appropriately.
*/
if (hw->queues > IEEE80211_MAX_QUEUES)
hw->queues = IEEE80211_MAX_QUEUES;
local->workqueue =
alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
if (!local->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,
IEEE80211_TX_STATUS_HEADROOM);
debugfs_hw_add(local);
/*
* if the driver doesn't specify a max listen interval we
* use 5 which should be a safe default
*/
if (local->hw.max_listen_interval == 0)
local->hw.max_listen_interval = 5;
local->hw.conf.listen_interval = local->hw.max_listen_interval;
local->dynamic_ps_forced_timeout = -1;
if (!local->hw.txq_ac_max_pending)
local->hw.txq_ac_max_pending = 64;
result = ieee80211_wep_init(local);
if (result < 0)
wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
result);
local->hw.conf.flags = IEEE80211_CONF_IDLE;
ieee80211_led_init(local);
rtnl_lock();
result = ieee80211_init_rate_ctrl_alg(local,
hw->rate_control_algorithm);
if (result < 0) {
wiphy_debug(local->hw.wiphy,
"Failed to initialize rate control algorithm\n");
goto fail_rate;
}
/* add one default STA interface if supported */
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
!ieee80211_hw_check(hw, NO_AUTO_VIF)) {
result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
NL80211_IFTYPE_STATION, NULL);
if (result)
wiphy_warn(local->hw.wiphy,
"Failed to add default virtual iface\n");
}
rtnl_unlock();
#ifdef CONFIG_INET
local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
result = register_inetaddr_notifier(&local->ifa_notifier);
if (result)
goto fail_ifa;
#endif
#if IS_ENABLED(CONFIG_IPV6)
local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
result = register_inet6addr_notifier(&local->ifa6_notifier);
if (result)
goto fail_ifa6;
#endif
return 0;
#if IS_ENABLED(CONFIG_IPV6)
fail_ifa6:
#ifdef CONFIG_INET
unregister_inetaddr_notifier(&local->ifa_notifier);
#endif
#endif
#if defined(CONFIG_INET) || defined(CONFIG_IPV6)
fail_ifa:
#endif
rtnl_lock();
rate_control_deinitialize(local);
ieee80211_remove_interfaces(local);
fail_rate:
rtnl_unlock();
ieee80211_led_exit(local);
ieee80211_wep_free(local);
destroy_workqueue(local->workqueue);
fail_workqueue:
wiphy_unregister(local->hw.wiphy);
fail_wiphy_register:
if (local->wiphy_ciphers_allocated)
kfree(local->hw.wiphy->cipher_suites);
kfree(local->int_scan_req);
return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);
void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
tasklet_kill(&local->tx_pending_tasklet);
tasklet_kill(&local->tasklet);
#ifdef CONFIG_INET
unregister_inetaddr_notifier(&local->ifa_notifier);
#endif
#if IS_ENABLED(CONFIG_IPV6)
unregister_inet6addr_notifier(&local->ifa6_notifier);
#endif
rtnl_lock();
/*
* At this point, interface list manipulations are fine
* because the driver cannot be handing us frames any
* more and the tasklet is killed.
*/
ieee80211_remove_interfaces(local);
rtnl_unlock();
cancel_delayed_work_sync(&local->roc_work);
cancel_work_sync(&local->restart_work);
cancel_work_sync(&local->reconfig_filter);
cancel_work_sync(&local->tdls_chsw_work);
flush_work(&local->sched_scan_stopped_work);
ieee80211_clear_tx_pending(local);
rate_control_deinitialize(local);
if (skb_queue_len(&local->skb_queue) ||
skb_queue_len(&local->skb_queue_unreliable))
wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
skb_queue_purge(&local->skb_queue);
skb_queue_purge(&local->skb_queue_unreliable);
skb_queue_purge(&local->skb_queue_tdls_chsw);
destroy_workqueue(local->workqueue);
wiphy_unregister(local->hw.wiphy);
ieee80211_wep_free(local);
ieee80211_led_exit(local);
kfree(local->int_scan_req);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);
static int ieee80211_free_ack_frame(int id, void *p, void *data)
{
WARN_ONCE(1, "Have pending ack frames!\n");
kfree_skb(p);
return 0;
}
void ieee80211_free_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
mutex_destroy(&local->iflist_mtx);
mutex_destroy(&local->mtx);
if (local->wiphy_ciphers_allocated)
kfree(local->hw.wiphy->cipher_suites);
idr_for_each(&local->ack_status_frames,
ieee80211_free_ack_frame, NULL);
idr_destroy(&local->ack_status_frames);
sta_info_stop(local);
ieee80211_free_led_names(local);
wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);
static int __init ieee80211_init(void)
{
struct sk_buff *skb;
int ret;
BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
ret = rc80211_minstrel_init();
if (ret)
return ret;
ret = rc80211_minstrel_ht_init();
if (ret)
goto err_minstrel;
ret = ieee80211_iface_init();
if (ret)
goto err_netdev;
return 0;
err_netdev:
rc80211_minstrel_ht_exit();
err_minstrel:
rc80211_minstrel_exit();
return ret;
}
static void __exit ieee80211_exit(void)
{
rc80211_minstrel_ht_exit();
rc80211_minstrel_exit();
ieee80211s_stop();
ieee80211_iface_exit();
rcu_barrier();
}
subsys_initcall(ieee80211_init);
module_exit(ieee80211_exit);
MODULE_DESCRIPTION("IEEE 802.11 subsystem");
MODULE_LICENSE("GPL");
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