![Johannes Berg](/assets/img/avatar_default.png)
rfkill currently requires a global lock within the rfkill_register() function, and holds that lock over calls to the set_block() methods. This means that we cannot hold a lock around rfkill_register() that we also require in set_block(), directly or indirectly. Fix cfg80211 to register rfkill outside the block locked by its global lock. Much of what cfg80211 does in the locked block doesn't need to be locked anyway. Reported-by: Vasanthakumar Thiagarajan <vasanth@atheros.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
639 lines
15 KiB
C
639 lines
15 KiB
C
/*
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* This is the linux wireless configuration interface.
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*
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* Copyright 2006-2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/if.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/nl80211.h>
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#include <linux/debugfs.h>
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#include <linux/notifier.h>
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#include <linux/device.h>
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#include <linux/rtnetlink.h>
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#include <net/genetlink.h>
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#include <net/cfg80211.h>
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#include "nl80211.h"
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#include "core.h"
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#include "sysfs.h"
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#include "debugfs.h"
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/* name for sysfs, %d is appended */
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#define PHY_NAME "phy"
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MODULE_AUTHOR("Johannes Berg");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("wireless configuration support");
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/* RCU might be appropriate here since we usually
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* only read the list, and that can happen quite
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* often because we need to do it for each command */
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LIST_HEAD(cfg80211_drv_list);
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/*
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* This is used to protect the cfg80211_drv_list, cfg80211_regdomain,
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* country_ie_regdomain, the reg_beacon_list and the the last regulatory
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* request receipt (last_request).
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*/
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DEFINE_MUTEX(cfg80211_mutex);
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/* for debugfs */
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static struct dentry *ieee80211_debugfs_dir;
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/* requires cfg80211_mutex to be held! */
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struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx)
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{
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struct cfg80211_registered_device *result = NULL, *drv;
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if (!wiphy_idx_valid(wiphy_idx))
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return NULL;
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assert_cfg80211_lock();
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list_for_each_entry(drv, &cfg80211_drv_list, list) {
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if (drv->wiphy_idx == wiphy_idx) {
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result = drv;
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break;
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}
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}
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return result;
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}
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int get_wiphy_idx(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *drv;
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if (!wiphy)
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return WIPHY_IDX_STALE;
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drv = wiphy_to_dev(wiphy);
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return drv->wiphy_idx;
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}
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/* requires cfg80211_drv_mutex to be held! */
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struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
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{
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struct cfg80211_registered_device *drv;
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if (!wiphy_idx_valid(wiphy_idx))
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return NULL;
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assert_cfg80211_lock();
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drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
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if (!drv)
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return NULL;
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return &drv->wiphy;
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}
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/* requires cfg80211_mutex to be held! */
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struct cfg80211_registered_device *
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__cfg80211_drv_from_info(struct genl_info *info)
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{
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int ifindex;
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struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
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struct net_device *dev;
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int err = -EINVAL;
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assert_cfg80211_lock();
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if (info->attrs[NL80211_ATTR_WIPHY]) {
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bywiphyidx = cfg80211_drv_by_wiphy_idx(
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nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
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err = -ENODEV;
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}
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if (info->attrs[NL80211_ATTR_IFINDEX]) {
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ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
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dev = dev_get_by_index(&init_net, ifindex);
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if (dev) {
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if (dev->ieee80211_ptr)
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byifidx =
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wiphy_to_dev(dev->ieee80211_ptr->wiphy);
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dev_put(dev);
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}
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err = -ENODEV;
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}
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if (bywiphyidx && byifidx) {
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if (bywiphyidx != byifidx)
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return ERR_PTR(-EINVAL);
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else
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return bywiphyidx; /* == byifidx */
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}
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if (bywiphyidx)
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return bywiphyidx;
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if (byifidx)
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return byifidx;
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return ERR_PTR(err);
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}
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struct cfg80211_registered_device *
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cfg80211_get_dev_from_info(struct genl_info *info)
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{
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struct cfg80211_registered_device *drv;
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mutex_lock(&cfg80211_mutex);
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drv = __cfg80211_drv_from_info(info);
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/* if it is not an error we grab the lock on
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* it to assure it won't be going away while
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* we operate on it */
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if (!IS_ERR(drv))
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mutex_lock(&drv->mtx);
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mutex_unlock(&cfg80211_mutex);
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return drv;
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}
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struct cfg80211_registered_device *
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cfg80211_get_dev_from_ifindex(int ifindex)
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{
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struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
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struct net_device *dev;
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mutex_lock(&cfg80211_mutex);
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dev = dev_get_by_index(&init_net, ifindex);
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if (!dev)
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goto out;
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if (dev->ieee80211_ptr) {
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drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
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mutex_lock(&drv->mtx);
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} else
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drv = ERR_PTR(-ENODEV);
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dev_put(dev);
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out:
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mutex_unlock(&cfg80211_mutex);
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return drv;
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}
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void cfg80211_put_dev(struct cfg80211_registered_device *drv)
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{
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BUG_ON(IS_ERR(drv));
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mutex_unlock(&drv->mtx);
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}
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/* requires cfg80211_mutex to be held */
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int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
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char *newname)
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{
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struct cfg80211_registered_device *drv;
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int wiphy_idx, taken = -1, result, digits;
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assert_cfg80211_lock();
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/* prohibit calling the thing phy%d when %d is not its number */
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sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
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if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
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/* count number of places needed to print wiphy_idx */
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digits = 1;
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while (wiphy_idx /= 10)
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digits++;
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/*
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* deny the name if it is phy<idx> where <idx> is printed
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* without leading zeroes. taken == strlen(newname) here
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*/
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if (taken == strlen(PHY_NAME) + digits)
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return -EINVAL;
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}
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/* Ignore nop renames */
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if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
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return 0;
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/* Ensure another device does not already have this name. */
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list_for_each_entry(drv, &cfg80211_drv_list, list)
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if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
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return -EINVAL;
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result = device_rename(&rdev->wiphy.dev, newname);
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if (result)
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return result;
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if (rdev->wiphy.debugfsdir &&
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!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
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rdev->wiphy.debugfsdir,
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rdev->wiphy.debugfsdir->d_parent,
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newname))
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printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
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newname);
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nl80211_notify_dev_rename(rdev);
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return 0;
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}
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static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
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{
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struct cfg80211_registered_device *drv = data;
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drv->ops->rfkill_poll(&drv->wiphy);
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}
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static int cfg80211_rfkill_set_block(void *data, bool blocked)
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{
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struct cfg80211_registered_device *drv = data;
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struct wireless_dev *wdev;
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if (!blocked)
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return 0;
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rtnl_lock();
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mutex_lock(&drv->devlist_mtx);
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list_for_each_entry(wdev, &drv->netdev_list, list)
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dev_close(wdev->netdev);
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mutex_unlock(&drv->devlist_mtx);
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rtnl_unlock();
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return 0;
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}
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static void cfg80211_rfkill_sync_work(struct work_struct *work)
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{
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struct cfg80211_registered_device *drv;
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drv = container_of(work, struct cfg80211_registered_device, rfkill_sync);
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cfg80211_rfkill_set_block(drv, rfkill_blocked(drv->rfkill));
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}
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/* exported functions */
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struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
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{
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static int wiphy_counter;
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struct cfg80211_registered_device *drv;
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int alloc_size;
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WARN_ON(!ops->add_key && ops->del_key);
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WARN_ON(ops->add_key && !ops->del_key);
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alloc_size = sizeof(*drv) + sizeof_priv;
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drv = kzalloc(alloc_size, GFP_KERNEL);
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if (!drv)
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return NULL;
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drv->ops = ops;
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mutex_lock(&cfg80211_mutex);
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drv->wiphy_idx = wiphy_counter++;
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if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
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wiphy_counter--;
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mutex_unlock(&cfg80211_mutex);
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/* ugh, wrapped! */
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kfree(drv);
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return NULL;
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}
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mutex_unlock(&cfg80211_mutex);
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/* give it a proper name */
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dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
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mutex_init(&drv->mtx);
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mutex_init(&drv->devlist_mtx);
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INIT_LIST_HEAD(&drv->netdev_list);
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spin_lock_init(&drv->bss_lock);
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INIT_LIST_HEAD(&drv->bss_list);
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device_initialize(&drv->wiphy.dev);
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drv->wiphy.dev.class = &ieee80211_class;
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drv->wiphy.dev.platform_data = drv;
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drv->rfkill_ops.set_block = cfg80211_rfkill_set_block;
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drv->rfkill = rfkill_alloc(dev_name(&drv->wiphy.dev),
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&drv->wiphy.dev, RFKILL_TYPE_WLAN,
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&drv->rfkill_ops, drv);
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if (!drv->rfkill) {
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kfree(drv);
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return NULL;
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}
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INIT_WORK(&drv->rfkill_sync, cfg80211_rfkill_sync_work);
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/*
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* Initialize wiphy parameters to IEEE 802.11 MIB default values.
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* Fragmentation and RTS threshold are disabled by default with the
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* special -1 value.
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*/
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drv->wiphy.retry_short = 7;
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drv->wiphy.retry_long = 4;
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drv->wiphy.frag_threshold = (u32) -1;
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drv->wiphy.rts_threshold = (u32) -1;
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return &drv->wiphy;
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}
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EXPORT_SYMBOL(wiphy_new);
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int wiphy_register(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
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int res;
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enum ieee80211_band band;
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struct ieee80211_supported_band *sband;
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bool have_band = false;
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int i;
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u16 ifmodes = wiphy->interface_modes;
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if (WARN_ON(wiphy->max_scan_ssids < 1))
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return -EINVAL;
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/* sanity check ifmodes */
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WARN_ON(!ifmodes);
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ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
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if (WARN_ON(ifmodes != wiphy->interface_modes))
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wiphy->interface_modes = ifmodes;
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/* sanity check supported bands/channels */
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for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
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sband = wiphy->bands[band];
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if (!sband)
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continue;
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sband->band = band;
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if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
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return -EINVAL;
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/*
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* Since we use a u32 for rate bitmaps in
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* ieee80211_get_response_rate, we cannot
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* have more than 32 legacy rates.
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*/
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if (WARN_ON(sband->n_bitrates > 32))
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return -EINVAL;
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for (i = 0; i < sband->n_channels; i++) {
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sband->channels[i].orig_flags =
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sband->channels[i].flags;
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sband->channels[i].orig_mag =
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sband->channels[i].max_antenna_gain;
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sband->channels[i].orig_mpwr =
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sband->channels[i].max_power;
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sband->channels[i].band = band;
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}
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have_band = true;
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}
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if (!have_band) {
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WARN_ON(1);
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return -EINVAL;
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}
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/* check and set up bitrates */
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ieee80211_set_bitrate_flags(wiphy);
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res = device_add(&drv->wiphy.dev);
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if (res)
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return res;
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res = rfkill_register(drv->rfkill);
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if (res)
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goto out_rm_dev;
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mutex_lock(&cfg80211_mutex);
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/* set up regulatory info */
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wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
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list_add(&drv->list, &cfg80211_drv_list);
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mutex_unlock(&cfg80211_mutex);
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/* add to debugfs */
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drv->wiphy.debugfsdir =
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debugfs_create_dir(wiphy_name(&drv->wiphy),
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ieee80211_debugfs_dir);
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if (IS_ERR(drv->wiphy.debugfsdir))
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drv->wiphy.debugfsdir = NULL;
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if (wiphy->custom_regulatory) {
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struct regulatory_request request;
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request.wiphy_idx = get_wiphy_idx(wiphy);
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request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
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request.alpha2[0] = '9';
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request.alpha2[1] = '9';
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nl80211_send_reg_change_event(&request);
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}
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cfg80211_debugfs_drv_add(drv);
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return 0;
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out_rm_dev:
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device_del(&drv->wiphy.dev);
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return res;
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}
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EXPORT_SYMBOL(wiphy_register);
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void wiphy_rfkill_start_polling(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
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if (!drv->ops->rfkill_poll)
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return;
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drv->rfkill_ops.poll = cfg80211_rfkill_poll;
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rfkill_resume_polling(drv->rfkill);
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}
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EXPORT_SYMBOL(wiphy_rfkill_start_polling);
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void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
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rfkill_pause_polling(drv->rfkill);
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}
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EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
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void wiphy_unregister(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
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rfkill_unregister(drv->rfkill);
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/* protect the device list */
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mutex_lock(&cfg80211_mutex);
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BUG_ON(!list_empty(&drv->netdev_list));
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/*
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* Try to grab drv->mtx. If a command is still in progress,
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* hopefully the driver will refuse it since it's tearing
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* down the device already. We wait for this command to complete
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* before unlinking the item from the list.
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* Note: as codified by the BUG_ON above we cannot get here if
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* a virtual interface is still associated. Hence, we can only
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* get to lock contention here if userspace issues a command
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* that identified the hardware by wiphy index.
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*/
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mutex_lock(&drv->mtx);
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/* unlock again before freeing */
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mutex_unlock(&drv->mtx);
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cfg80211_debugfs_drv_del(drv);
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/* If this device got a regulatory hint tell core its
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* free to listen now to a new shiny device regulatory hint */
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reg_device_remove(wiphy);
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list_del(&drv->list);
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device_del(&drv->wiphy.dev);
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debugfs_remove(drv->wiphy.debugfsdir);
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mutex_unlock(&cfg80211_mutex);
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}
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EXPORT_SYMBOL(wiphy_unregister);
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void cfg80211_dev_free(struct cfg80211_registered_device *drv)
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{
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struct cfg80211_internal_bss *scan, *tmp;
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rfkill_destroy(drv->rfkill);
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mutex_destroy(&drv->mtx);
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mutex_destroy(&drv->devlist_mtx);
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list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
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cfg80211_put_bss(&scan->pub);
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kfree(drv);
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}
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void wiphy_free(struct wiphy *wiphy)
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{
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put_device(&wiphy->dev);
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}
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EXPORT_SYMBOL(wiphy_free);
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void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
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{
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struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
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if (rfkill_set_hw_state(drv->rfkill, blocked))
|
|
schedule_work(&drv->rfkill_sync);
|
|
}
|
|
EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
|
|
|
|
static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
|
|
unsigned long state,
|
|
void *ndev)
|
|
{
|
|
struct net_device *dev = ndev;
|
|
struct cfg80211_registered_device *rdev;
|
|
|
|
if (!dev->ieee80211_ptr)
|
|
return NOTIFY_DONE;
|
|
|
|
rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
|
|
|
|
WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
|
|
|
|
switch (state) {
|
|
case NETDEV_REGISTER:
|
|
mutex_lock(&rdev->devlist_mtx);
|
|
list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
|
|
if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
|
|
"phy80211")) {
|
|
printk(KERN_ERR "wireless: failed to add phy80211 "
|
|
"symlink to netdev!\n");
|
|
}
|
|
dev->ieee80211_ptr->netdev = dev;
|
|
#ifdef CONFIG_WIRELESS_EXT
|
|
dev->ieee80211_ptr->wext.default_key = -1;
|
|
dev->ieee80211_ptr->wext.default_mgmt_key = -1;
|
|
#endif
|
|
mutex_unlock(&rdev->devlist_mtx);
|
|
break;
|
|
case NETDEV_GOING_DOWN:
|
|
if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
|
|
break;
|
|
if (!dev->ieee80211_ptr->ssid_len)
|
|
break;
|
|
cfg80211_leave_ibss(rdev, dev, true);
|
|
break;
|
|
case NETDEV_UP:
|
|
#ifdef CONFIG_WIRELESS_EXT
|
|
if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
|
|
break;
|
|
if (!dev->ieee80211_ptr->wext.ibss.ssid_len)
|
|
break;
|
|
cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext.ibss);
|
|
break;
|
|
#endif
|
|
case NETDEV_UNREGISTER:
|
|
mutex_lock(&rdev->devlist_mtx);
|
|
if (!list_empty(&dev->ieee80211_ptr->list)) {
|
|
sysfs_remove_link(&dev->dev.kobj, "phy80211");
|
|
list_del_init(&dev->ieee80211_ptr->list);
|
|
}
|
|
mutex_unlock(&rdev->devlist_mtx);
|
|
break;
|
|
case NETDEV_PRE_UP:
|
|
if (rfkill_blocked(rdev->rfkill))
|
|
return notifier_from_errno(-ERFKILL);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block cfg80211_netdev_notifier = {
|
|
.notifier_call = cfg80211_netdev_notifier_call,
|
|
};
|
|
|
|
static int cfg80211_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = wiphy_sysfs_init();
|
|
if (err)
|
|
goto out_fail_sysfs;
|
|
|
|
err = register_netdevice_notifier(&cfg80211_netdev_notifier);
|
|
if (err)
|
|
goto out_fail_notifier;
|
|
|
|
err = nl80211_init();
|
|
if (err)
|
|
goto out_fail_nl80211;
|
|
|
|
ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
|
|
|
|
err = regulatory_init();
|
|
if (err)
|
|
goto out_fail_reg;
|
|
|
|
return 0;
|
|
|
|
out_fail_reg:
|
|
debugfs_remove(ieee80211_debugfs_dir);
|
|
out_fail_nl80211:
|
|
unregister_netdevice_notifier(&cfg80211_netdev_notifier);
|
|
out_fail_notifier:
|
|
wiphy_sysfs_exit();
|
|
out_fail_sysfs:
|
|
return err;
|
|
}
|
|
|
|
subsys_initcall(cfg80211_init);
|
|
|
|
static void cfg80211_exit(void)
|
|
{
|
|
debugfs_remove(ieee80211_debugfs_dir);
|
|
nl80211_exit();
|
|
unregister_netdevice_notifier(&cfg80211_netdev_notifier);
|
|
wiphy_sysfs_exit();
|
|
regulatory_exit();
|
|
}
|
|
module_exit(cfg80211_exit);
|