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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Johannes Berg](/assets/img/avatar_default.png)
This patch creates new cfg80211 wiphy API for channel and bitrate registration and converts mac80211 and drivers to the new API. The old mac80211 API is completely ripped out. All drivers (except ath5k) are updated to the new API, in many cases I expect that optimisations can be done. Along with the regulatory code I've also ripped out the IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag, I believe it to be unnecessary if the hardware simply gives us whatever channels it wants to support and we then enable/disable them as required, which is pretty much required for travelling. Additionally, the patch adds proper "basic" rate handling for STA mode interface, AP mode interface will have to have new API added to allow userspace to set the basic rate set, currently it'll be empty... However, the basic rate handling will need to be moved to the BSS conf stuff. I do expect there to be bugs in this, especially wrt. transmit power handling where I'm basically clueless about how it should work. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
416 lines
9.4 KiB
C
416 lines
9.4 KiB
C
/*
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* This is the linux wireless configuration interface.
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*
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* Copyright 2006, 2007 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/mutex.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 <net/genetlink.h>
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#include <net/cfg80211.h>
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#include <net/wireless.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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/* 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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DEFINE_MUTEX(cfg80211_drv_mutex);
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static int wiphy_counter;
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/* for debugfs */
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static struct dentry *ieee80211_debugfs_dir;
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/* requires cfg80211_drv_mutex to be held! */
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static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
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{
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struct cfg80211_registered_device *result = NULL, *drv;
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list_for_each_entry(drv, &cfg80211_drv_list, list) {
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if (drv->idx == wiphy) {
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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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/* requires cfg80211_drv_mutex to be held! */
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static 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 *bywiphy = NULL, *byifidx = NULL;
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struct net_device *dev;
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int err = -EINVAL;
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if (info->attrs[NL80211_ATTR_WIPHY]) {
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bywiphy = cfg80211_drv_by_wiphy(
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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 (bywiphy && byifidx) {
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if (bywiphy != byifidx)
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return ERR_PTR(-EINVAL);
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else
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return bywiphy; /* == byifidx */
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}
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if (bywiphy)
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return bywiphy;
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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_drv_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_drv_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_drv_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_drv_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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int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
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char *newname)
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{
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int idx, taken = -1, result, digits;
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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", &idx, &taken);
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if (taken == strlen(newname) && idx != rdev->idx) {
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/* count number of places needed to print idx */
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digits = 1;
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while (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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/* this will check for collisions */
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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 (!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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/* exported functions */
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struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
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{
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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_drv_mutex);
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drv->idx = wiphy_counter;
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/* now increase counter for the next device unless
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* it has wrapped previously */
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if (wiphy_counter >= 0)
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wiphy_counter++;
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mutex_unlock(&cfg80211_drv_mutex);
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if (unlikely(drv->idx < 0)) {
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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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/* give it a proper name */
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snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
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PHY_NAME "%d", drv->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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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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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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/* 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 (!sband->n_channels || !sband->n_bitrates) {
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WARN_ON(1);
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return -EINVAL;
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}
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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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/* set up regulatory info */
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wiphy_update_regulatory(wiphy);
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mutex_lock(&cfg80211_drv_mutex);
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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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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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res = 0;
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out_unlock:
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mutex_unlock(&cfg80211_drv_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_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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/* protect the device list */
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mutex_lock(&cfg80211_drv_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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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_drv_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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mutex_destroy(&drv->mtx);
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mutex_destroy(&drv->devlist_mtx);
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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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static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
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unsigned long state,
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void *ndev)
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{
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struct net_device *dev = ndev;
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struct cfg80211_registered_device *rdev;
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if (!dev->ieee80211_ptr)
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return 0;
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rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
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switch (state) {
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case NETDEV_REGISTER:
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mutex_lock(&rdev->devlist_mtx);
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list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
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if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
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"phy80211")) {
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printk(KERN_ERR "wireless: failed to add phy80211 "
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"symlink to netdev!\n");
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}
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dev->ieee80211_ptr->netdev = dev;
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mutex_unlock(&rdev->devlist_mtx);
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break;
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case NETDEV_UNREGISTER:
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mutex_lock(&rdev->devlist_mtx);
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if (!list_empty(&dev->ieee80211_ptr->list)) {
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sysfs_remove_link(&dev->dev.kobj, "phy80211");
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list_del_init(&dev->ieee80211_ptr->list);
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}
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mutex_unlock(&rdev->devlist_mtx);
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break;
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}
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return 0;
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}
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static struct notifier_block cfg80211_netdev_notifier = {
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.notifier_call = cfg80211_netdev_notifier_call,
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};
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static int cfg80211_init(void)
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{
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int err = wiphy_sysfs_init();
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if (err)
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goto out_fail_sysfs;
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err = register_netdevice_notifier(&cfg80211_netdev_notifier);
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if (err)
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goto out_fail_notifier;
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err = nl80211_init();
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if (err)
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goto out_fail_nl80211;
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ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
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return 0;
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out_fail_nl80211:
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unregister_netdevice_notifier(&cfg80211_netdev_notifier);
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out_fail_notifier:
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wiphy_sysfs_exit();
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out_fail_sysfs:
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return err;
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}
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subsys_initcall(cfg80211_init);
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static void cfg80211_exit(void)
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{
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debugfs_remove(ieee80211_debugfs_dir);
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nl80211_exit();
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unregister_netdevice_notifier(&cfg80211_netdev_notifier);
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wiphy_sysfs_exit();
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}
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module_exit(cfg80211_exit);
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