/
core.c
1104 lines (913 loc) · 27.4 KB
/
core.c
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/*
* This is the linux wireless configuration interface.
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
*/
//#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "nl80211.h"
#include "core.h"
#include "sysfs.h"
#include "debugfs.h"
#include "wext-compat.h"
#include "ethtool.h"
/* name for sysfs, %d is appended */
#define PHY_NAME "phy"
MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");
/* RCU-protected (and cfg80211_mutex for writers) */
LIST_HEAD(cfg80211_rdev_list);
int cfg80211_rdev_list_generation;
DEFINE_MUTEX(cfg80211_mutex);
/* for debugfs */
static struct dentry *ieee80211_debugfs_dir;
/* for the cleanup, scan and event works */
struct workqueue_struct *cfg80211_wq;
static bool cfg80211_disable_40mhz_24ghz;
module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
"Disable 40MHz support in the 2.4GHz band");
/* requires cfg80211_mutex to be held! */
struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
{
struct cfg80211_registered_device *result = NULL, *rdev;
if (!wiphy_idx_valid(wiphy_idx))
return NULL;
assert_cfg80211_lock();
list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
if (rdev->wiphy_idx == wiphy_idx) {
result = rdev;
break;
}
}
return result;
}
int get_wiphy_idx(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev;
if (!wiphy)
return WIPHY_IDX_STALE;
rdev = wiphy_to_dev(wiphy);
return rdev->wiphy_idx;
}
/* requires cfg80211_rdev_mutex to be held! */
struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
{
struct cfg80211_registered_device *rdev;
if (!wiphy_idx_valid(wiphy_idx))
return NULL;
assert_cfg80211_lock();
rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
if (!rdev)
return NULL;
return &rdev->wiphy;
}
/* requires cfg80211_mutex to be held! */
struct cfg80211_registered_device *
__cfg80211_rdev_from_info(struct genl_info *info)
{
int ifindex;
struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
struct net_device *dev;
int err = -EINVAL;
assert_cfg80211_lock();
if (info->attrs[NL80211_ATTR_WIPHY]) {
bywiphyidx = cfg80211_rdev_by_wiphy_idx(
nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
err = -ENODEV;
}
if (info->attrs[NL80211_ATTR_IFINDEX]) {
ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
dev = dev_get_by_index(genl_info_net(info), ifindex);
if (dev) {
if (dev->ieee80211_ptr)
byifidx =
wiphy_to_dev(dev->ieee80211_ptr->wiphy);
dev_put(dev);
}
err = -ENODEV;
}
if (bywiphyidx && byifidx) {
if (bywiphyidx != byifidx)
return ERR_PTR(-EINVAL);
else
return bywiphyidx; /* == byifidx */
}
if (bywiphyidx)
return bywiphyidx;
if (byifidx)
return byifidx;
return ERR_PTR(err);
}
struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info)
{
struct cfg80211_registered_device *rdev;
mutex_lock(&cfg80211_mutex);
rdev = __cfg80211_rdev_from_info(info);
/* if it is not an error we grab the lock on
* it to assure it won't be going away while
* we operate on it */
if (!IS_ERR(rdev))
mutex_lock(&rdev->mtx);
mutex_unlock(&cfg80211_mutex);
return rdev;
}
struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
{
struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
struct net_device *dev;
mutex_lock(&cfg80211_mutex);
dev = dev_get_by_index(net, ifindex);
if (!dev)
goto out;
if (dev->ieee80211_ptr) {
rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
mutex_lock(&rdev->mtx);
} else
rdev = ERR_PTR(-ENODEV);
dev_put(dev);
out:
mutex_unlock(&cfg80211_mutex);
return rdev;
}
/* requires cfg80211_mutex to be held */
int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname)
{
struct cfg80211_registered_device *rdev2;
int wiphy_idx, taken = -1, result, digits;
assert_cfg80211_lock();
/* prohibit calling the thing phy%d when %d is not its number */
sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
/* count number of places needed to print wiphy_idx */
digits = 1;
while (wiphy_idx /= 10)
digits++;
/*
* deny the name if it is phy<idx> where <idx> is printed
* without leading zeroes. taken == strlen(newname) here
*/
if (taken == strlen(PHY_NAME) + digits)
return -EINVAL;
}
/* Ignore nop renames */
if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
return 0;
/* Ensure another device does not already have this name. */
list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
return -EINVAL;
result = device_rename(&rdev->wiphy.dev, newname);
if (result)
return result;
if (rdev->wiphy.debugfsdir &&
!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
rdev->wiphy.debugfsdir,
rdev->wiphy.debugfsdir->d_parent,
newname))
pr_err("failed to rename debugfs dir to %s!\n", newname);
nl80211_notify_dev_rename(rdev);
return 0;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
struct net *net)
{
struct wireless_dev *wdev;
int err = 0;
if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
return -EOPNOTSUPP;
list_for_each_entry(wdev, &rdev->netdev_list, list) {
wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
if (err)
break;
wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
}
if (err) {
/* failed -- clean up to old netns */
net = wiphy_net(&rdev->wiphy);
list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
list) {
wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
err = dev_change_net_namespace(wdev->netdev, net,
"wlan%d");
WARN_ON(err);
wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
}
return err;
}
wiphy_net_set(&rdev->wiphy, net);
err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
WARN_ON(err);
return 0;
}
#endif
static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
{
struct cfg80211_registered_device *rdev = data;
rdev->ops->rfkill_poll(&rdev->wiphy);
}
static int cfg80211_rfkill_set_block(void *data, bool blocked)
{
struct cfg80211_registered_device *rdev = data;
struct wireless_dev *wdev;
if (!blocked)
return 0;
rtnl_lock();
mutex_lock(&rdev->devlist_mtx);
list_for_each_entry(wdev, &rdev->netdev_list, list)
dev_close(wdev->netdev);
mutex_unlock(&rdev->devlist_mtx);
rtnl_unlock();
return 0;
}
static void cfg80211_rfkill_sync_work(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
}
static void cfg80211_event_work(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device,
event_work);
rtnl_lock();
cfg80211_lock_rdev(rdev);
cfg80211_process_rdev_events(rdev);
cfg80211_unlock_rdev(rdev);
rtnl_unlock();
}
/* exported functions */
struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
{
static int wiphy_counter;
struct cfg80211_registered_device *rdev;
int alloc_size;
/*
* Make sure the padding is >= the rest of the struct so that we
* always keep it large enough to pad out the entire original
* kernel's struct. We really only need to make sure it's larger
* than the kernel compat is compiled against, but since it'll
* only increase in size make sure it's larger than the current
* version of it. Subtract since it's included.
*/
BUILD_BUG_ON(WIPHY_COMPAT_PAD_SIZE <
sizeof(struct wiphy) - WIPHY_COMPAT_PAD_SIZE);
WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
WARN_ON(ops->connect && !ops->disconnect);
WARN_ON(ops->join_ibss && !ops->leave_ibss);
WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
WARN_ON(ops->add_station && !ops->del_station);
WARN_ON(ops->add_mpath && !ops->del_mpath);
WARN_ON(ops->join_mesh && !ops->leave_mesh);
alloc_size = sizeof(*rdev) + sizeof_priv;
rdev = kzalloc(alloc_size, GFP_KERNEL);
if (!rdev)
return NULL;
rdev->ops = ops;
mutex_lock(&cfg80211_mutex);
rdev->wiphy_idx = wiphy_counter++;
if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
wiphy_counter--;
mutex_unlock(&cfg80211_mutex);
/* ugh, wrapped! */
kfree(rdev);
return NULL;
}
mutex_unlock(&cfg80211_mutex);
/* give it a proper name */
dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
mutex_init(&rdev->mtx);
mutex_init(&rdev->devlist_mtx);
mutex_init(&rdev->sched_scan_mtx);
INIT_LIST_HEAD(&rdev->netdev_list);
spin_lock_init(&rdev->bss_lock);
INIT_LIST_HEAD(&rdev->bss_list);
INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
device_initialize(&rdev->wiphy.dev);
rdev->wiphy.dev.class = &ieee80211_class;
rdev->wiphy.dev.platform_data = rdev;
#ifdef CONFIG_CFG80211_DEFAULT_PS
rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
wiphy_net_set(&rdev->wiphy, &init_net);
#endif
rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
&rdev->wiphy.dev, RFKILL_TYPE_WLAN,
&rdev->rfkill_ops, rdev);
if (!rdev->rfkill) {
kfree(rdev);
return NULL;
}
INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
INIT_WORK(&rdev->event_work, cfg80211_event_work);
init_waitqueue_head(&rdev->dev_wait);
/*
* Initialize wiphy parameters to IEEE 802.11 MIB default values.
* Fragmentation and RTS threshold are disabled by default with the
* special -1 value.
*/
rdev->wiphy.retry_short = 7;
rdev->wiphy.retry_long = 4;
rdev->wiphy.frag_threshold = (u32) -1;
rdev->wiphy.rts_threshold = (u32) -1;
rdev->wiphy.coverage_class = 0;
return &rdev->wiphy;
}
EXPORT_SYMBOL(wiphy_new);
static int wiphy_verify_combinations(struct wiphy *wiphy)
{
const struct ieee80211_iface_combination *c;
int i, j;
/* If we have combinations enforce them */
if (wiphy->n_iface_combinations)
wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS;
for (i = 0; i < wiphy->n_iface_combinations; i++) {
u32 cnt = 0;
u16 all_iftypes = 0;
c = &wiphy->iface_combinations[i];
/* Combinations with just one interface aren't real */
if (WARN_ON(c->max_interfaces < 2))
return -EINVAL;
/* Need at least one channel */
if (WARN_ON(!c->num_different_channels))
return -EINVAL;
if (WARN_ON(!c->n_limits))
return -EINVAL;
for (j = 0; j < c->n_limits; j++) {
u16 types = c->limits[j].types;
/*
* interface types shouldn't overlap, this is
* used in cfg80211_can_change_interface()
*/
if (WARN_ON(types & all_iftypes))
return -EINVAL;
all_iftypes |= types;
if (WARN_ON(!c->limits[j].max))
return -EINVAL;
/* Shouldn't list software iftypes in combinations! */
if (WARN_ON(wiphy->software_iftypes & types))
return -EINVAL;
cnt += c->limits[j].max;
/*
* Don't advertise an unsupported type
* in a combination.
*/
if (WARN_ON((wiphy->interface_modes & types) != types))
return -EINVAL;
}
/* You can't even choose that many! */
if (WARN_ON(cnt < c->max_interfaces))
return -EINVAL;
}
return 0;
}
int wiphy_register(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
int res;
enum ieee80211_band band;
struct ieee80211_supported_band *sband;
bool have_band = false;
int i;
u16 ifmodes = wiphy->interface_modes;
if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
!(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
return -EINVAL;
if (WARN_ON(wiphy->ap_sme_capa &&
!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
return -EINVAL;
if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
return -EINVAL;
if (WARN_ON(wiphy->addresses &&
!is_zero_ether_addr(wiphy->perm_addr) &&
memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
ETH_ALEN)))
return -EINVAL;
if (wiphy->addresses)
memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
/* sanity check ifmodes */
WARN_ON(!ifmodes);
ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
if (WARN_ON(ifmodes != wiphy->interface_modes))
wiphy->interface_modes = ifmodes;
res = wiphy_verify_combinations(wiphy);
if (res)
return res;
/* sanity check supported bands/channels */
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
sband = wiphy->bands[band];
if (!sband)
continue;
sband->band = band;
if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
return -EINVAL;
/*
* Since cfg80211_disable_40mhz_24ghz is global, we can
* modify the sband's ht data even if the driver uses a
* global structure for that.
*/
if (cfg80211_disable_40mhz_24ghz &&
band == IEEE80211_BAND_2GHZ &&
sband->ht_cap.ht_supported) {
sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
}
/*
* Since we use a u32 for rate bitmaps in
* ieee80211_get_response_rate, we cannot
* have more than 32 legacy rates.
*/
if (WARN_ON(sband->n_bitrates > 32))
return -EINVAL;
for (i = 0; i < sband->n_channels; i++) {
sband->channels[i].orig_flags =
sband->channels[i].flags;
sband->channels[i].orig_mag =
sband->channels[i].max_antenna_gain;
sband->channels[i].orig_mpwr =
sband->channels[i].max_power;
sband->channels[i].band = band;
}
have_band = true;
}
if (!have_band) {
WARN_ON(1);
return -EINVAL;
}
if (rdev->wiphy.wowlan.n_patterns) {
if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
rdev->wiphy.wowlan.pattern_min_len >
rdev->wiphy.wowlan.pattern_max_len))
return -EINVAL;
}
/* check and set up bitrates */
ieee80211_set_bitrate_flags(wiphy);
mutex_lock(&cfg80211_mutex);
res = device_add(&rdev->wiphy.dev);
if (res) {
mutex_unlock(&cfg80211_mutex);
return res;
}
/* set up regulatory info */
regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE);
list_add_rcu(&rdev->list, &cfg80211_rdev_list);
cfg80211_rdev_list_generation++;
/* add to debugfs */
rdev->wiphy.debugfsdir =
debugfs_create_dir(wiphy_name(&rdev->wiphy),
ieee80211_debugfs_dir);
if (IS_ERR(rdev->wiphy.debugfsdir))
rdev->wiphy.debugfsdir = NULL;
if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
struct regulatory_request request;
request.wiphy_idx = get_wiphy_idx(wiphy);
request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
request.alpha2[0] = '9';
request.alpha2[1] = '9';
nl80211_send_reg_change_event(&request);
}
cfg80211_debugfs_rdev_add(rdev);
mutex_unlock(&cfg80211_mutex);
/*
* due to a locking dependency this has to be outside of the
* cfg80211_mutex lock
*/
res = rfkill_register(rdev->rfkill);
if (res)
goto out_rm_dev;
rtnl_lock();
rdev->wiphy.registered = true;
rtnl_unlock();
return 0;
out_rm_dev:
device_del(&rdev->wiphy.dev);
return res;
}
EXPORT_SYMBOL(wiphy_register);
void wiphy_rfkill_start_polling(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
if (!rdev->ops->rfkill_poll)
return;
rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
rfkill_resume_polling(rdev->rfkill);
}
EXPORT_SYMBOL(wiphy_rfkill_start_polling);
void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
rfkill_pause_polling(rdev->rfkill);
}
EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
void wiphy_unregister(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
rtnl_lock();
rdev->wiphy.registered = false;
rtnl_unlock();
rfkill_unregister(rdev->rfkill);
/* protect the device list */
mutex_lock(&cfg80211_mutex);
wait_event(rdev->dev_wait, ({
int __count;
mutex_lock(&rdev->devlist_mtx);
__count = rdev->opencount;
mutex_unlock(&rdev->devlist_mtx);
__count == 0;}));
mutex_lock(&rdev->devlist_mtx);
BUG_ON(!list_empty(&rdev->netdev_list));
mutex_unlock(&rdev->devlist_mtx);
/*
* First remove the hardware from everywhere, this makes
* it impossible to find from userspace.
*/
debugfs_remove_recursive(rdev->wiphy.debugfsdir);
list_del_rcu(&rdev->list);
synchronize_rcu();
/*
* Try to grab rdev->mtx. If a command is still in progress,
* hopefully the driver will refuse it since it's tearing
* down the device already. We wait for this command to complete
* before unlinking the item from the list.
* Note: as codified by the BUG_ON above we cannot get here if
* a virtual interface is still present. Hence, we can only get
* to lock contention here if userspace issues a command that
* identified the hardware by wiphy index.
*/
cfg80211_lock_rdev(rdev);
/* nothing */
cfg80211_unlock_rdev(rdev);
/* If this device got a regulatory hint tell core its
* free to listen now to a new shiny device regulatory hint */
reg_device_remove(wiphy);
cfg80211_rdev_list_generation++;
device_del(&rdev->wiphy.dev);
mutex_unlock(&cfg80211_mutex);
flush_work(&rdev->scan_done_wk);
cancel_work_sync(&rdev->conn_work);
flush_work(&rdev->event_work);
}
EXPORT_SYMBOL(wiphy_unregister);
void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
{
struct cfg80211_internal_bss *scan, *tmp;
rfkill_destroy(rdev->rfkill);
mutex_destroy(&rdev->mtx);
mutex_destroy(&rdev->devlist_mtx);
mutex_destroy(&rdev->sched_scan_mtx);
list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
cfg80211_put_bss(&scan->pub);
cfg80211_rdev_free_wowlan(rdev);
kfree(rdev);
}
void wiphy_free(struct wiphy *wiphy)
{
put_device(&wiphy->dev);
}
EXPORT_SYMBOL(wiphy_free);
void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
if (rfkill_set_hw_state(rdev->rfkill, blocked))
schedule_work(&rdev->rfkill_sync);
}
EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
static void wdev_cleanup_work(struct work_struct *work)
{
struct wireless_dev *wdev;
struct cfg80211_registered_device *rdev;
wdev = container_of(work, struct wireless_dev, cleanup_work);
rdev = wiphy_to_dev(wdev->wiphy);
cfg80211_lock_rdev(rdev);
if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
rdev->scan_req->aborted = true;
___cfg80211_scan_done(rdev, true);
}
cfg80211_unlock_rdev(rdev);
mutex_lock(&rdev->sched_scan_mtx);
if (WARN_ON(rdev->sched_scan_req &&
rdev->sched_scan_req->dev == wdev->netdev)) {
__cfg80211_stop_sched_scan(rdev, false);
}
mutex_unlock(&rdev->sched_scan_mtx);
mutex_lock(&rdev->devlist_mtx);
rdev->opencount--;
mutex_unlock(&rdev->devlist_mtx);
wake_up(&rdev->dev_wait);
dev_put(wdev->netdev);
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
static struct device_type wiphy_type = {
.name = "wlan",
};
#endif
static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
unsigned long state,
void *ndev)
{
struct net_device *dev = ndev;
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev;
int ret;
if (!wdev)
return NOTIFY_DONE;
rdev = wiphy_to_dev(wdev->wiphy);
WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
switch (state) {
case NETDEV_POST_INIT:
SET_NETDEV_DEVTYPE(dev, &wiphy_type);
break;
case NETDEV_REGISTER:
/*
* NB: cannot take rdev->mtx here because this may be
* called within code protected by it when interfaces
* are added with nl80211.
*/
mutex_init(&wdev->mtx);
INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
INIT_LIST_HEAD(&wdev->event_list);
spin_lock_init(&wdev->event_lock);
INIT_LIST_HEAD(&wdev->mgmt_registrations);
spin_lock_init(&wdev->mgmt_registrations_lock);
mutex_lock(&rdev->devlist_mtx);
list_add_rcu(&wdev->list, &rdev->netdev_list);
rdev->devlist_generation++;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
/* can only change netns with wiphy */
dev->features |= NETIF_F_NETNS_LOCAL;
#endif
if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
"phy80211")) {
pr_err("failed to add phy80211 symlink to netdev!\n");
}
wdev->netdev = dev;
wdev->sme_state = CFG80211_SME_IDLE;
mutex_unlock(&rdev->devlist_mtx);
#ifdef CONFIG_CFG80211_WEXT
#ifdef CONFIG_WIRELESS_EXT
if (!dev->wireless_handlers)
dev->wireless_handlers = &cfg80211_wext_handler;
#else
printk_once(KERN_WARNING "cfg80211: wext will not work because "
"kernel was compiled with CONFIG_WIRELESS_EXT=n. "
"Tools using wext interface, like iwconfig will "
"not work.\n");
#endif
wdev->wext.default_key = -1;
wdev->wext.default_mgmt_key = -1;
wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
#endif
if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
wdev->ps = true;
else
wdev->ps = false;
/* allow mac80211 to determine the timeout */
wdev->ps_timeout = -1;
if (!dev->ethtool_ops)
dev->ethtool_ops = &cfg80211_ethtool_ops;
if ((wdev->iftype == NL80211_IFTYPE_STATION ||
wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
dev->priv_flags |= IFF_DONT_BRIDGE;
break;
case NETDEV_GOING_DOWN:
switch (wdev->iftype) {
case NL80211_IFTYPE_ADHOC:
cfg80211_leave_ibss(rdev, dev, true);
break;
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_STATION:
mutex_lock(&rdev->sched_scan_mtx);
__cfg80211_stop_sched_scan(rdev, false);
mutex_unlock(&rdev->sched_scan_mtx);
wdev_lock(wdev);
#ifdef CONFIG_CFG80211_WEXT
kfree(wdev->wext.ie);
wdev->wext.ie = NULL;
wdev->wext.ie_len = 0;
wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
#endif
__cfg80211_disconnect(rdev, dev,
WLAN_REASON_DEAUTH_LEAVING, true);
cfg80211_mlme_down(rdev, dev);
wdev_unlock(wdev);
break;
case NL80211_IFTYPE_MESH_POINT:
cfg80211_leave_mesh(rdev, dev);
break;
default:
break;
}
wdev->beacon_interval = 0;
break;
case NETDEV_DOWN:
dev_hold(dev);
queue_work(cfg80211_wq, &wdev->cleanup_work);
break;
case NETDEV_UP:
/*
* If we have a really quick DOWN/UP succession we may
* have this work still pending ... cancel it and see
* if it was pending, in which case we need to account
* for some of the work it would have done.
*/
if (cancel_work_sync(&wdev->cleanup_work)) {
mutex_lock(&rdev->devlist_mtx);
rdev->opencount--;
mutex_unlock(&rdev->devlist_mtx);
dev_put(dev);
}
cfg80211_lock_rdev(rdev);
mutex_lock(&rdev->devlist_mtx);
wdev_lock(wdev);
switch (wdev->iftype) {
#ifdef CONFIG_CFG80211_WEXT
case NL80211_IFTYPE_ADHOC:
cfg80211_ibss_wext_join(rdev, wdev);
break;
case NL80211_IFTYPE_STATION:
cfg80211_mgd_wext_connect(rdev, wdev);
break;
#endif
#ifdef CONFIG_MAC80211_MESH
case NL80211_IFTYPE_MESH_POINT:
{
/* backward compat code... */
struct mesh_setup setup;
memcpy(&setup, &default_mesh_setup,
sizeof(setup));
/* back compat only needed for mesh_id */
setup.mesh_id = wdev->ssid;
setup.mesh_id_len = wdev->mesh_id_up_len;
if (wdev->mesh_id_up_len)
__cfg80211_join_mesh(rdev, dev,
&setup,
&default_mesh_config);
break;
}
#endif
default:
break;
}
wdev_unlock(wdev);
rdev->opencount++;
mutex_unlock(&rdev->devlist_mtx);
cfg80211_unlock_rdev(rdev);
/*
* Configure power management to the driver here so that its
* correctly set also after interface type changes etc.
*/
if ((wdev->iftype == NL80211_IFTYPE_STATION ||
wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
rdev->ops->set_power_mgmt)
if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
wdev->ps,
wdev->ps_timeout)) {
/* assume this means it's off */
wdev->ps = false;
}
break;
case NETDEV_UNREGISTER:
/*
* NB: cannot take rdev->mtx here because this may be
* called within code protected by it when interfaces
* are removed with nl80211.
*/
mutex_lock(&rdev->devlist_mtx);
/*
* It is possible to get NETDEV_UNREGISTER
* multiple times. To detect that, check
* that the interface is still on the list
* of registered interfaces, and only then
* remove and clean it up.
*/
if (!list_empty(&wdev->list)) {
sysfs_remove_link(&dev->dev.kobj, "phy80211");
list_del_rcu(&wdev->list);
rdev->devlist_generation++;
cfg80211_mlme_purge_registrations(wdev);
#ifdef CONFIG_CFG80211_WEXT
kfree(wdev->wext.keys);
#endif
}
mutex_unlock(&rdev->devlist_mtx);
/*
* synchronise (so that we won't find this netdev
* from other code any more) and then clear the list
* head so that the above code can safely check for
* !list_empty() to avoid double-cleanup.
*/
synchronize_rcu();