/*
* 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