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linux/net/mac80211/iface.c
Wolfram Sang 28b904ec48 wifi: mac80211: move from strlcpy with unused retval to strscpy 
Follow the advice of the below link and prefer 'strscpy' in this
subsystem. Conversion is 1:1 because the return value is not used.
Generated by a coccinelle script.

Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2022-08-26 09:57:51 +02:00

2570 lines
67 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Interface handling
*
* 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>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (c) 2016 Intel Deutschland GmbH
* Copyright (C) 2018-2022 Intel Corporation
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/kcov.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.
*/
static void ieee80211_iface_work(struct work_struct *work);
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.bss_conf.chanctx_conf);
if (!chanctx_conf) {
rcu_read_unlock();
return false;
}
power = ieee80211_chandef_max_power(&chanctx_conf->def);
rcu_read_unlock();
if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
power = min(power, sdata->deflink.user_power_level);
if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
power = min(power, sdata->deflink.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,
bool update_bss)
{
if (__ieee80211_recalc_txpower(sdata) ||
(update_bss && ieee80211_sdata_running(sdata)))
ieee80211_link_info_change_notify(sdata, &sdata->deflink,
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;
ieee80211_flush_queues(local, NULL, false);
local->hw.conf.flags |= IEEE80211_CONF_IDLE;
return IEEE80211_CONF_CHANGE_IDLE;
}
static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
bool force_active)
{
bool working, scanning, active;
unsigned int led_trig_start = 0, led_trig_stop = 0;
lockdep_assert_held(&local->mtx);
active = force_active ||
!list_empty(&local->chanctx_list) ||
local->monitors;
working = !local->ops->remain_on_channel &&
!list_empty(&local->roc_list);
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)
return __ieee80211_idle_off(local);
return __ieee80211_idle_on(local);
}
u32 ieee80211_idle_off(struct ieee80211_local *local)
{
return __ieee80211_recalc_idle(local, true);
}
void ieee80211_recalc_idle(struct ieee80211_local *local)
{
u32 change = __ieee80211_recalc_idle(local, false);
if (change)
ieee80211_hw_config(local, change);
}
static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
bool check_dup)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *iter;
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);
if (!check_dup)
return ret;
mutex_lock(&local->iflist_mtx);
list_for_each_entry(iter, &local->interfaces, list) {
if (iter == sdata)
continue;
if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
!(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
continue;
m = iter->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;
bool check_dup = true;
int ret;
if (ieee80211_sdata_running(sdata))
return -EBUSY;
if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
check_dup = false;
ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
if (ret)
return ret;
ret = eth_mac_addr(dev, sa);
if (ret == 0) {
memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
}
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_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;
int ret;
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)) {
/*
* Only OCB and monitor mode may coexist
*/
if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
(sdata->vif.type != NL80211_IFTYPE_MONITOR &&
nsdata->vif.type == NL80211_IFTYPE_OCB))
return -EBUSY;
/*
* 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;
/*
* will not add another interface while any channel
* switch is active.
*/
if (nsdata->vif.bss_conf.csa_active)
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;
}
}
mutex_lock(&local->chanctx_mtx);
ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
mutex_unlock(&local->chanctx_mtx);
return ret;
}
static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype iftype)
{
int n_queues = sdata->local->hw.queues;
int i;
if (iftype == NL80211_IFTYPE_NAN)
return 0;
if (iftype != 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 ((iftype != NL80211_IFTYPE_AP &&
iftype != NL80211_IFTYPE_P2P_GO &&
iftype != NL80211_IFTYPE_MESH_POINT) ||
!ieee80211_hw_check(&sdata->local->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;
}
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;
wiphy_lock(sdata->local->hw.wiphy);
err = ieee80211_do_open(&sdata->wdev, true);
wiphy_unlock(sdata->local->hw.wiphy);
return err;
}
static void ieee80211_link_setup(struct ieee80211_link_data *link)
{
if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_mgd_setup_link(link);
}
static void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
int link_id,
struct ieee80211_link_data *link,
struct ieee80211_bss_conf *link_conf)
{
bool deflink = link_id < 0;
if (link_id < 0)
link_id = 0;
rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
rcu_assign_pointer(sdata->link[link_id], link);
link->sdata = sdata;
link->link_id = link_id;
link->conf = link_conf;
link_conf->link_id = link_id;
INIT_WORK(&link->csa_finalize_work,
ieee80211_csa_finalize_work);
INIT_WORK(&link->color_change_finalize_work,
ieee80211_color_change_finalize_work);
INIT_LIST_HEAD(&link->assigned_chanctx_list);
INIT_LIST_HEAD(&link->reserved_chanctx_list);
INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
ieee80211_dfs_cac_timer_work);
if (!deflink) {
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
ether_addr_copy(link_conf->addr,
sdata->wdev.links[link_id].addr);
link_conf->bssid = link_conf->addr;
WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
break;
case NL80211_IFTYPE_STATION:
/* station sets the bssid in ieee80211_mgd_setup_link */
break;
default:
WARN_ON(1);
}
}
}
static void ieee80211_link_stop(struct ieee80211_link_data *link)
{
if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_mgd_stop_link(link);
ieee80211_link_release_channel(link);
}
struct link_container {
struct ieee80211_link_data data;
struct ieee80211_bss_conf conf;
};
static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
struct link_container **links)
{
LIST_HEAD(keys);
unsigned int link_id;
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
if (!links[link_id])
continue;
ieee80211_remove_link_keys(&links[link_id]->data, &keys);
}
synchronize_rcu();
ieee80211_free_key_list(sdata->local, &keys);
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
if (!links[link_id])
continue;
ieee80211_link_stop(&links[link_id]->data);
kfree(links[link_id]);
}
}
static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
{
unsigned int i, j;
for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
struct ieee80211_link_data *link1;
link1 = sdata_dereference(sdata->link[i], sdata);
if (!link1)
continue;
for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
struct ieee80211_link_data *link2;
link2 = sdata_dereference(sdata->link[j], sdata);
if (!link2)
continue;
if (ether_addr_equal(link1->conf->addr,
link2->conf->addr))
return -EALREADY;
}
}
return 0;
}
static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
struct link_container **to_free,
u16 new_links)
{
u16 old_links = sdata->vif.valid_links;
unsigned long add = new_links & ~old_links;
unsigned long rem = old_links & ~new_links;
unsigned int link_id;
int ret;
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
bool use_deflink = old_links == 0; /* set for error case */
sdata_assert_lock(sdata);
memset(to_free, 0, sizeof(links));
if (old_links == new_links)
return 0;
/* if there were no old links, need to clear the pointers to deflink */
if (!old_links)
rem |= BIT(0);
/* allocate new link structures first */
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link) {
ret = -ENOMEM;
goto free;
}
links[link_id] = link;
}
/* keep track of the old pointers for the driver */
BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
memcpy(old, sdata->vif.link_conf, sizeof(old));
/* and for us in error cases */
BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
memcpy(old_data, sdata->link, sizeof(old_data));
/* grab old links to free later */
for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
/*
* we must have allocated the data through this path so
* we know we can free both at the same time
*/
to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
typeof(*links[link_id]),
data);
}
RCU_INIT_POINTER(sdata->link[link_id], NULL);
RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
}
/* link them into data structures */
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
WARN_ON(!use_deflink &&
rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
link = links[link_id];
ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
ieee80211_link_setup(&link->data);
}
if (new_links == 0)
ieee80211_link_init(sdata, -1, &sdata->deflink,
&sdata->vif.bss_conf);
sdata->vif.valid_links = new_links;
ret = ieee80211_check_dup_link_addrs(sdata);
if (!ret) {
/* tell the driver */
ret = drv_change_vif_links(sdata->local, sdata,
old_links, new_links,
old);
}
if (ret) {
/* restore config */
memcpy(sdata->link, old_data, sizeof(old_data));
memcpy(sdata->vif.link_conf, old, sizeof(old));
sdata->vif.valid_links = old_links;
/* and free (only) the newly allocated links */
memset(to_free, 0, sizeof(links));
goto free;
}
/* use deflink/bss_conf again if and only if there are no more links */
use_deflink = new_links == 0;
goto deinit;
free:
/* if we failed during allocation, only free all */
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
kfree(links[link_id]);
links[link_id] = NULL;
}
deinit:
if (use_deflink)
ieee80211_link_init(sdata, -1, &sdata->deflink,
&sdata->vif.bss_conf);
return ret;
}
int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
u16 new_links)
{
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
int ret;
ret = ieee80211_vif_update_links(sdata, links, new_links);
ieee80211_free_links(sdata, links);
return ret;
}
static void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
{
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
/*
* The locking here is different because when we free links
* in the station case we need to be able to cancel_work_sync()
* something that also takes the lock.
*/
sdata_lock(sdata);
ieee80211_vif_update_links(sdata, links, 0);
sdata_unlock(sdata);
ieee80211_free_links(sdata, links);
}
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;
struct cfg80211_chan_def chandef;
bool cancel_scan;
struct cfg80211_nan_func *func;
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
if (cancel_scan)
ieee80211_scan_cancel(local);
/*
* Stop TX on this interface first.
*/
if (sdata->dev)
netif_tx_stop_all_queues(sdata->dev);
ieee80211_roc_purge(local, sdata);
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ieee80211_mgd_stop(sdata);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_stop(sdata);
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
break;
list_del_rcu(&sdata->u.mntr.list);
break;
default:
break;
}
/*
* 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!)
*
* For AP_VLANs stations may exist since there's nothing else that
* would have removed them, but in other modes there shouldn't
* be any stations.
*/
flushed = sta_info_flush(sdata);
WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
/* don't count this interface for allmulti while it is down */
if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
atomic_dec(&local->iff_allmultis);
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);
}
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
cancel_work_sync(&sdata->recalc_smps);
sdata_lock(sdata);
WARN(sdata->vif.valid_links,
"destroying interface with valid links 0x%04x\n",
sdata->vif.valid_links);
mutex_lock(&local->mtx);
sdata->vif.bss_conf.csa_active = false;
if (sdata->vif.type == NL80211_IFTYPE_STATION)
sdata->deflink.u.mgd.csa_waiting_bcn = false;
if (sdata->deflink.csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->deflink.csa_block_tx = false;
}
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
cancel_work_sync(&sdata->deflink.csa_finalize_work);
cancel_work_sync(&sdata->deflink.color_change_finalize_work);
cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
if (sdata->wdev.cac_started) {
chandef = sdata->vif.bss_conf.chandef;
WARN_ON(local->suspended);
mutex_lock(&local->mtx);
ieee80211_link_release_channel(&sdata->deflink);
mutex_unlock(&local->mtx);
cfg80211_cac_event(sdata->dev, &chandef,
NL80211_RADAR_CAC_ABORTED,
GFP_KERNEL);
}
if (sdata->vif.type == NL80211_IFTYPE_AP) {
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:
mutex_lock(&local->mtx);
list_del(&sdata->u.vlan.list);
mutex_unlock(&local->mtx);
RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
/* see comment in the default case below */
ieee80211_free_keys(sdata, true);
/* 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_adjust_monitor_flags(sdata, -1);
break;
case NL80211_IFTYPE_NAN:
/* clean all the functions */
spin_lock_bh(&sdata->u.nan.func_lock);
idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
idr_remove(&sdata->u.nan.function_inst_ids, i);
cfg80211_free_nan_func(func);
}
idr_destroy(&sdata->u.nan.function_inst_ids);
spin_unlock_bh(&sdata->u.nan.func_lock);
break;
case NL80211_IFTYPE_P2P_DEVICE:
/* relies on synchronize_rcu() below */
RCU_INIT_POINTER(local->p2p_sdata, NULL);
fallthrough;
default:
cancel_work_sync(&sdata->work);
/*
* When we get here, the interface is marked down.
* Free the remaining keys, if there are any
* (which can happen in AP mode if userspace sets
* keys before the interface is operating)
*
* Force the key freeing to always synchronize_net()
* to wait for the RX path in case it is using this
* interface enqueuing frames at this very time on
* another CPU.
*/
ieee80211_free_keys(sdata, true);
skb_queue_purge(&sdata->skb_queue);
skb_queue_purge(&sdata->status_queue);
}
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 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
ieee80211_txq_remove_vlan(local, sdata);
sdata->bss = NULL;
if (local->open_count == 0)
ieee80211_clear_tx_pending(local);
sdata->vif.bss_conf.beacon_int = 0;
/*
* If the interface goes down while suspended, presumably because
* the device was unplugged and that happens before our resume,
* then the driver is already unconfigured and the remainder of
* this function isn't needed.
* XXX: what about WoWLAN? If the device has software state, e.g.
* memory allocated, it might expect teardown commands from
* mac80211 here?
*/
if (local->suspended) {
WARN_ON(local->wowlan);
WARN_ON(rcu_access_pointer(local->monitor_sdata));
return;
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_MONITOR:
if (local->monitors == 0)
ieee80211_del_virtual_monitor(local);
mutex_lock(&local->mtx);
ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
break;
fallthrough;
default:
if (going_down)
drv_remove_interface(local, sdata);
}
ieee80211_recalc_ps(local);
if (cancel_scan)
flush_delayed_work(&local->scan_work);
if (local->open_count == 0) {
ieee80211_stop_device(local);
/* no reconfiguring after stop! */
return;
}
/* do after stop to avoid reconfiguring when we stop anyway */
ieee80211_configure_filter(local);
ieee80211_hw_config(local, hw_reconf_flags);
if (local->monitors == local->open_count)
ieee80211_add_virtual_monitor(local);
}
static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
if (!tx_vif)
return;
tx_sdata = vif_to_sdata(tx_vif);
sdata->vif.mbssid_tx_vif = NULL;
list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
&tx_sdata->local->interfaces, list) {
if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
ieee80211_sdata_running(non_tx_sdata)) {
non_tx_sdata->vif.mbssid_tx_vif = NULL;
dev_close(non_tx_sdata->wdev.netdev);
}
}
if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
tx_sdata->vif.mbssid_tx_vif = NULL;
dev_close(tx_sdata->wdev.netdev);
}
}
static int ieee80211_stop(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
/* close dependent VLAN and MBSSID interfaces before locking wiphy */
if (sdata->vif.type == NL80211_IFTYPE_AP) {
struct ieee80211_sub_if_data *vlan, *tmpsdata;
list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
u.vlan.list)
dev_close(vlan->dev);
ieee80211_stop_mbssid(sdata);
}
wiphy_lock(sdata->local->hw.wiphy);
ieee80211_do_stop(sdata, true);
wiphy_unlock(sdata->local->hw.wiphy);
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, sdata_allmulti;
allmulti = !!(dev->flags & IFF_ALLMULTI);
sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
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;
}
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)
{
/* free extra data */
ieee80211_free_keys(sdata, false);
ieee80211_debugfs_remove_netdev(sdata);
ieee80211_destroy_frag_cache(&sdata->frags);
if (ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_mesh_teardown_sdata(sdata);
ieee80211_vif_clear_links(sdata);
ieee80211_link_stop(&sdata->deflink);
}
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,
struct net_device *sb_dev)
{
return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
}
static void
ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
dev_fetch_sw_netstats(stats, dev->tstats);
}
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_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_netdev_select_queue,
.ndo_get_stats64 = ieee80211_get_stats64,
};
static u16 ieee80211_monitor_select_queue(struct net_device *dev,
struct sk_buff *skb,
struct net_device *sb_dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr;
int len_rthdr;
if (local->hw.queues < IEEE80211_NUM_ACS)
return 0;
/* reset flags and info before parsing radiotap header */
memset(info, 0, sizeof(*info));
if (!ieee80211_parse_tx_radiotap(skb, dev))
return 0; /* doesn't matter, frame will be dropped */
len_rthdr = ieee80211_get_radiotap_len(skb->data);
hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
if (skb->len < len_rthdr + 2 ||
skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
return 0; /* doesn't matter, frame will be dropped */
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_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_monitor_select_queue,
.ndo_get_stats64 = ieee80211_get_stats64,
};
static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
struct net_device_path *path)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_local *local;
struct sta_info *sta;
int ret = -ENOENT;
sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
local = sdata->local;
if (!local->ops->net_fill_forward_path)
return -EOPNOTSUPP;
rcu_read_lock();
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
sta = rcu_dereference(sdata->u.vlan.sta);
if (sta)
break;
if (sdata->wdev.use_4addr)
goto out;
if (is_multicast_ether_addr(ctx->daddr))
goto out;
sta = sta_info_get_bss(sdata, ctx->daddr);
break;
case NL80211_IFTYPE_AP:
if (is_multicast_ether_addr(ctx->daddr))
goto out;
sta = sta_info_get(sdata, ctx->daddr);
break;
case NL80211_IFTYPE_STATION:
if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
sta = sta_info_get(sdata, ctx->daddr);
if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
goto out;
break;
}
}
sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
break;
default:
goto out;
}
if (!sta)
goto out;
ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
out:
rcu_read_unlock();
return ret;
}
static const struct net_device_ops ieee80211_dataif_8023_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_uninit,
.ndo_start_xmit = ieee80211_subif_start_xmit_8023,
.ndo_set_rx_mode = ieee80211_set_multicast_list,
.ndo_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_netdev_select_queue,
.ndo_get_stats64 = ieee80211_get_stats64,
.ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
};
static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
{
switch (iftype) {
/* P2P GO and client are mapped to AP/STATION types */
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_STATION:
return true;
default:
return false;
}
}
static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
u32 flags;
flags = sdata->vif.offload_flags;
if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
local->hw.wiphy->frag_threshold != (u32)-1)
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (local->monitors)
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
} else {
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
}
if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
if (local->monitors &&
!ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
} else {
flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
}
if (sdata->vif.offload_flags == flags)
return false;
sdata->vif.offload_flags = flags;
ieee80211_check_fast_rx_iface(sdata);
return true;
}
static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *bss = sdata;
bool enabled;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
if (!sdata->bss)
return;
bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
}
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
!ieee80211_iftype_supports_hdr_offload(bss->vif.type))
return;
enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (sdata->wdev.use_4addr &&
!(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
enabled = false;
sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
&ieee80211_dataif_ops;
}
static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *vsdata;
if (ieee80211_set_sdata_offload_flags(sdata)) {
drv_update_vif_offload(local, sdata);
ieee80211_set_vif_encap_ops(sdata);
}
list_for_each_entry(vsdata, &local->interfaces, list) {
if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
vsdata->bss != &sdata->u.ap)
continue;
ieee80211_set_vif_encap_ops(vsdata);
}
}
void ieee80211_recalc_offload(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
return;
mutex_lock(&local->iflist_mtx);
list_for_each_entry(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
ieee80211_recalc_sdata_offload(sdata);
}
mutex_unlock(&local->iflist_mtx);
}
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 (ieee80211_hw_check(&local->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 void ieee80211_sdata_init(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
sdata->local = local;
/*
* Initialize the default link, so we can use link_id 0 for non-MLD,
* and that continues to work for non-MLD-aware drivers that use just
* vif.bss_conf instead of vif.link_conf.
*
* Note that we never change this, so if link ID 0 isn't used in an
* MLD connection, we get a separate allocation for it.
*/
ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
}
int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
int ret;
if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
return 0;
ASSERT_RTNL();
lockdep_assert_wiphy(local->hw.wiphy);
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->vif.type = NL80211_IFTYPE_MONITOR;
snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
wiphy_name(local->hw.wiphy));
sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
ieee80211_sdata_init(local, sdata);
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;
}
set_bit(SDATA_STATE_RUNNING, &sdata->state);
ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
if (ret) {
kfree(sdata);
return ret;
}
mutex_lock(&local->iflist_mtx);
rcu_assign_pointer(local->monitor_sdata, sdata);
mutex_unlock(&local->iflist_mtx);
mutex_lock(&local->mtx);
ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
IEEE80211_CHANCTX_EXCLUSIVE);
mutex_unlock(&local->mtx);
if (ret) {
mutex_lock(&local->iflist_mtx);
RCU_INIT_POINTER(local->monitor_sdata, NULL);
mutex_unlock(&local->iflist_mtx);
synchronize_net();
drv_remove_interface(local, sdata);
kfree(sdata);
return ret;
}
skb_queue_head_init(&sdata->skb_queue);
skb_queue_head_init(&sdata->status_queue);
INIT_WORK(&sdata->work, ieee80211_iface_work);
return 0;
}
void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
return;
ASSERT_RTNL();
lockdep_assert_wiphy(local->hw.wiphy);
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_INIT_POINTER(local->monitor_sdata, NULL);
mutex_unlock(&local->iflist_mtx);
synchronize_net();
mutex_lock(&local->mtx);
ieee80211_link_release_channel(&sdata->deflink);
mutex_unlock(&local->mtx);
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;
u32 changed = 0;
int res;
u32 hw_reconf_flags = 0;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN: {
struct ieee80211_sub_if_data *master;
if (!sdata->bss)
return -ENOLINK;
mutex_lock(&local->mtx);
list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
mutex_unlock(&local->mtx);
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;
sdata->control_port_over_nl80211 =
master->control_port_over_nl80211;
sdata->control_port_no_preauth =
master->control_port_no_preauth;
sdata->vif.cab_queue = master->vif.cab_queue;
memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
sizeof(sdata->vif.hw_queue));
sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
mutex_lock(&local->key_mtx);
sdata->crypto_tx_tailroom_needed_cnt +=
master->crypto_tx_tailroom_needed_cnt;
mutex_unlock(&local->key_mtx);
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:
case NL80211_IFTYPE_OCB:
case NL80211_IFTYPE_NAN:
/* no special treatment */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_WDS:
/* 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, 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)) {
eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
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 (sdata->bss->active) {
ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
netif_carrier_on(dev);
ieee80211_set_vif_encap_ops(sdata);
} else {
netif_carrier_off(dev);
}
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs++;
break;
}
if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
res = drv_add_interface(local, sdata);
if (res)
goto err_stop;
} else 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);
ieee80211_recalc_offload(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);
ieee80211_set_sdata_offload_flags(sdata);
res = drv_add_interface(local, sdata);
if (res)
goto err_stop;
ieee80211_set_vif_encap_ops(sdata);
res = ieee80211_check_queues(sdata,
ieee80211_vif_type_p2p(&sdata->vif));
if (res)
goto err_del_interface;
}
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.probe_req_reg)
drv_config_iface_filter(local, sdata,
FIF_PROBE_REQ,
FIF_PROBE_REQ);
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
sdata->vif.type != NL80211_IFTYPE_NAN)
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_link_info_change_notify(sdata, &sdata->deflink,
changed);
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
netif_carrier_off(dev);
break;
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
break;
default:
/* not reached */
WARN_ON(1);
}
/*
* Set default queue parameters so drivers don't
* need to initialise the hardware if the hardware
* doesn't start up with sane defaults.
* Enable QoS for anything but station interfaces.
*/
ieee80211_set_wmm_default(&sdata->deflink, true,
sdata->vif.type != NL80211_IFTYPE_STATION);
}
set_bit(SDATA_STATE_RUNNING, &sdata->state);
switch (sdata->vif.type) {
case NL80211_IFTYPE_P2P_DEVICE:
rcu_assign_pointer(local->p2p_sdata, sdata);
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
break;
list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
break;
default:
break;
}
/*
* 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 (coming_up)
local->open_count++;
if (hw_reconf_flags)
ieee80211_hw_config(local, hw_reconf_flags);
ieee80211_recalc_ps(local);
if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
local->ops->wake_tx_queue) {
/* XXX: for AP_VLAN, actually track AP queues */
if (dev)
netif_tx_start_all_queues(dev);
} else if (dev) {
unsigned long flags;
int n_acs = IEEE80211_NUM_ACS;
int ac;
if (local->hw.queues < IEEE80211_NUM_ACS)
n_acs = 1;
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
(local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
for (ac = 0; ac < n_acs; ac++) {
int ac_queue = sdata->vif.hw_queue[ac];
if (local->queue_stop_reasons[ac_queue] == 0 &&
skb_queue_empty(&local->pending[ac_queue]))
netif_start_subqueue(dev, ac);
}
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}
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) {
mutex_lock(&local->mtx);
list_del(&sdata->u.vlan.list);
mutex_unlock(&local->mtx);
}
/* might already be clear but that doesn't matter */
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
return res;
}
static void ieee80211_if_free(struct net_device *dev)
{
free_percpu(dev->tstats);
}
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->needs_free_netdev = true;
dev->priv_destructor = ieee80211_if_free;
}
static void ieee80211_if_setup_no_queue(struct net_device *dev)
{
ieee80211_if_setup(dev);
dev->priv_flags |= IFF_NO_QUEUE;
}
static void ieee80211_iface_process_skb(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_BACK) {
struct sta_info *sta;
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_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_VHT) {
switch (mgmt->u.action.u.vht_group_notif.action_code) {
case WLAN_VHT_ACTION_OPMODE_NOTIF: {
struct ieee80211_rx_status *status;
enum nl80211_band band;
struct sta_info *sta;
u8 opmode;
status = IEEE80211_SKB_RXCB(skb);
band = status->band;
opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (sta)
ieee80211_vht_handle_opmode(sdata,
&sta->deflink,
opmode, band);
mutex_unlock(&local->sta_mtx);
break;
}
case WLAN_VHT_ACTION_GROUPID_MGMT:
ieee80211_process_mu_groups(sdata, &sdata->deflink,
mgmt);
break;
default:
WARN_ON(1);
break;
}
} else if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_S1G) {
switch (mgmt->u.action.u.s1g.action_code) {
case WLAN_S1G_TWT_TEARDOWN:
case WLAN_S1G_TWT_SETUP:
ieee80211_s1g_rx_twt_action(sdata, skb);
break;
default:
break;
}
} else if (ieee80211_is_ext(mgmt->frame_control)) {
if (sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_sta_rx_queued_ext(sdata, skb);
else
WARN_ON(1);
} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
struct ieee80211_hdr *hdr = (void *)mgmt;
struct sta_info *sta;
/*
* 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_tid(hdr);
__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;
}
}
static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_S1G) {
switch (mgmt->u.action.u.s1g.action_code) {
case WLAN_S1G_TWT_TEARDOWN:
case WLAN_S1G_TWT_SETUP:
ieee80211_s1g_status_twt_action(sdata, skb);
break;
default:
break;
}
}
}
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;
if (!ieee80211_sdata_running(sdata))
return;
if (test_bit(SCAN_SW_SCANNING, &local->scanning))
return;
if (!ieee80211_can_run_worker(local))
return;
/* first process frames */
while ((skb = skb_dequeue(&sdata->skb_queue))) {
kcov_remote_start_common(skb_get_kcov_handle(skb));
if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
ieee80211_process_tdls_channel_switch(sdata, skb);
else
ieee80211_iface_process_skb(local, sdata, skb);
kfree_skb(skb);
kcov_remote_stop();
}
/* process status queue */
while ((skb = skb_dequeue(&sdata->status_queue))) {
kcov_remote_start_common(skb_get_kcov_handle(skb));
ieee80211_iface_process_status(sdata, skb);
kfree_skb(skb);
kcov_remote_stop();
}
/* 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;
case NL80211_IFTYPE_OCB:
ieee80211_ocb_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, &sdata->deflink);
}
/*
* 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)
{
static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
0xff, 0xff, 0xff};
/* clear type-dependent unions */
memset(&sdata->u, 0, sizeof(sdata->u));
memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.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->control_port_over_nl80211 = false;
sdata->control_port_no_preauth = false;
sdata->vif.cfg.idle = true;
sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
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);
skb_queue_head_init(&sdata->status_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;
fallthrough;
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;
fallthrough;
case NL80211_IFTYPE_STATION:
sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
ieee80211_sta_setup_sdata(sdata);
break;
case NL80211_IFTYPE_OCB:
sdata->vif.bss_conf.bssid = bssid_wildcard;
ieee80211_ocb_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_NAN:
idr_init(&sdata->u.nan.function_inst_ids);
spin_lock_init(&sdata->u.nan.func_lock);
sdata->vif.bss_conf.bssid = sdata->vif.addr;
break;
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_P2P_DEVICE:
sdata->vif.bss_conf.bssid = sdata->vif.addr;
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NL80211_IFTYPE_WDS:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
break;
}
/* need to do this after the switch so vif.type is correct */
ieee80211_link_setup(&sdata->deflink);
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;
/* for now, don't support changing while links exist */
if (sdata->vif.valid_links)
return -EBUSY;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
if (!list_empty(&sdata->u.ap.vlans))
return -EBUSY;
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_OCB:
/*
* 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:
case NL80211_IFTYPE_OCB:
/*
* Could probably support everything
* but here.
*/
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_stop_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
synchronize_net();
ieee80211_do_stop(sdata, false);
ieee80211_teardown_sdata(sdata);
ieee80211_set_sdata_offload_flags(sdata);
ret = drv_change_interface(local, sdata, internal_type, p2p);
if (ret)
type = ieee80211_vif_type_p2p(&sdata->vif);
/*
* 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, type);
ieee80211_setup_sdata(sdata, type);
ieee80211_set_vif_encap_ops(sdata);
err = ieee80211_do_open(&sdata->wdev, false);
WARN(err, "type change: do_open returned %d", err);
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
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 */
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_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 (ieee80211_hw_check(&local->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;
}
}
fallthrough;
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 (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
sdata->vif.addr)) {
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;
}
/*
* Pick address of existing interface in case user changed
* MAC address manually, default to perm_addr.
*/
m = local->hw.wiphy->perm_addr;
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
continue;
m = sdata->vif.addr;
break;
}
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 (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
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);
}
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
unsigned char name_assign_type,
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;
struct txq_info *txqi;
void (*if_setup)(struct net_device *dev);
int ret, i;
int txqs = 1;
ASSERT_RTNL();
if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
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;
strscpy(sdata->name, name, IFNAMSIZ);
ieee80211_assign_perm_addr(local, wdev->address, type);
memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
} else {
int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
sizeof(void *));
int txq_size = 0;
if (local->ops->wake_tx_queue &&
type != NL80211_IFTYPE_AP_VLAN &&
(type != NL80211_IFTYPE_MONITOR ||
(params->flags & MONITOR_FLAG_ACTIVE)))
txq_size += sizeof(struct txq_info) +
local->hw.txq_data_size;
if (local->ops->wake_tx_queue) {
if_setup = ieee80211_if_setup_no_queue;
} else {
if_setup = ieee80211_if_setup;
if (local->hw.queues >= IEEE80211_NUM_ACS)
txqs = IEEE80211_NUM_ACS;
}
ndev = alloc_netdev_mqs(size + txq_size,
name, name_assign_type,
if_setup, txqs, 1);
if (!ndev)
return -ENOMEM;
if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
dev_net_set(ndev, wiphy_net(local->hw.wiphy));
ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!ndev->tstats) {
free_netdev(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) {
ieee80211_if_free(ndev);
free_netdev(ndev);
return ret;
}
ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
if (is_valid_ether_addr(params->macaddr))
eth_hw_addr_set(ndev, params->macaddr);
else
eth_hw_addr_set(ndev, ndev->perm_addr);
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);
ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
memcpy(sdata->name, ndev->name, IFNAMSIZ);
if (txq_size) {
txqi = netdev_priv(ndev) + size;
ieee80211_txq_init(sdata, NULL, txqi, 0);
}
sdata->dev = ndev;
}
/* initialise type-independent data */
sdata->wdev.wiphy = local->hw.wiphy;
ieee80211_sdata_init(local, sdata);
ieee80211_init_frag_cache(&sdata->frags);
INIT_LIST_HEAD(&sdata->key_list);
INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
ieee80211_delayed_tailroom_dec);
for (i = 0; i < NUM_NL80211_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) {
__le16 cap;
u16 *vht_rate_mask;
memcpy(sdata->rc_rateidx_mcs_mask[i],
sband->ht_cap.mcs.rx_mask,
sizeof(sdata->rc_rateidx_mcs_mask[i]));
cap = sband->vht_cap.vht_mcs.rx_mcs_map;
vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
} else {
memset(sdata->rc_rateidx_mcs_mask[i], 0,
sizeof(sdata->rc_rateidx_mcs_mask[i]));
memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
}
}
ieee80211_set_default_queues(sdata);
sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
sdata->deflink.user_power_level = local->user_power_level;
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);
if (ndev) {
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;
ndev->hw_features |= ndev->features &
MAC80211_SUPPORTED_FEATURES_TX;
netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
/* MTU range is normally 256 - 2304, where the upper limit is
* the maximum MSDU size. Monitor interfaces send and receive
* MPDU and A-MSDU frames which may be much larger so we do
* not impose an upper limit in that case.
*/
ndev->min_mtu = 256;
if (type == NL80211_IFTYPE_MONITOR)
ndev->max_mtu = 0;
else
ndev->max_mtu = local->hw.max_mtu;
ret = cfg80211_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);
if (sdata->vif.txq)
ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
synchronize_rcu();
cfg80211_unregister_wdev(&sdata->wdev);
if (!sdata->dev) {
ieee80211_teardown_sdata(sdata);
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);
}
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();
/* Before destroying the interfaces, make sure they're all stopped so
* that the hardware is stopped. Otherwise, the driver might still be
* iterating the interfaces during the shutdown, e.g. from a worker
* or from RX processing or similar, and if it does so (using atomic
* iteration) while we're manipulating the list, the iteration will
* crash.
*
* After this, the hardware should be stopped and the driver should
* have stopped all of its activities, so that we can do RCU-unaware
* manipulations of the interface list below.
*/
cfg80211_shutdown_all_interfaces(local->hw.wiphy);
WARN(local->open_count, "%s: open count remains %d\n",
wiphy_name(local->hw.wiphy), local->open_count);
ieee80211_txq_teardown_flows(local);
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);
wiphy_lock(local->hw.wiphy);
list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
list_del(&sdata->list);
cfg80211_unregister_wdev(&sdata->wdev);
kfree(sdata);
}
wiphy_unlock(local->hw.wiphy);
}
static int netdev_notify(struct notifier_block *nb,
unsigned long state, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct ieee80211_sub_if_data *sdata;
if (state != NETDEV_CHANGENAME)
return NOTIFY_DONE;
if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
return NOTIFY_DONE;
if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
return NOTIFY_DONE;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
memcpy(sdata->name, dev->name, IFNAMSIZ);
ieee80211_debugfs_rename_netdev(sdata);
return NOTIFY_OK;
}
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);
}
void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.type == NL80211_IFTYPE_AP)
atomic_inc(&sdata->u.ap.num_mcast_sta);
else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
atomic_inc(&sdata->u.vlan.num_mcast_sta);
}
void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.type == NL80211_IFTYPE_AP)
atomic_dec(&sdata->u.ap.num_mcast_sta);
else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
atomic_dec(&sdata->u.vlan.num_mcast_sta);
}
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