![Johannes Berg](/assets/img/avatar_default.png)
To be easier on drivers and users, have cfg80211 register an rfkill structure that drivers can access. When soft-killed, simply take down all interfaces; when hard-killed the driver needs to notify us and we will take down the interfaces after the fact. While rfkilled, interfaces cannot be set UP. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
640 lines
15 KiB
C
640 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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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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res = device_add(&drv->wiphy.dev);
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if (res)
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goto out_unlock;
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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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list_add(&drv->list, &cfg80211_drv_list);
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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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res = 0;
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goto out_unlock;
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out_rm_dev:
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device_del(&drv->wiphy.dev);
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out_unlock:
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mutex_unlock(&cfg80211_mutex);
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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))
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schedule_work(&drv->rfkill_sync);
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}
|
|
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);
|