| /* |
| * This is the linux wireless configuration interface. |
| * |
| * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net> |
| */ |
| |
| #include <linux/if.h> |
| #include <linux/module.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| #include <linux/nl80211.h> |
| #include <linux/debugfs.h> |
| #include <linux/notifier.h> |
| #include <linux/device.h> |
| #include <net/genetlink.h> |
| #include <net/cfg80211.h> |
| #include "nl80211.h" |
| #include "core.h" |
| #include "sysfs.h" |
| |
| /* name for sysfs, %d is appended */ |
| #define PHY_NAME "phy" |
| |
| MODULE_AUTHOR("Johannes Berg"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("wireless configuration support"); |
| |
| /* RCU might be appropriate here since we usually |
| * only read the list, and that can happen quite |
| * often because we need to do it for each command */ |
| LIST_HEAD(cfg80211_drv_list); |
| |
| /* |
| * This is used to protect the cfg80211_drv_list, cfg80211_regdomain, |
| * country_ie_regdomain, the reg_beacon_list and the the last regulatory |
| * request receipt (last_request). |
| */ |
| DEFINE_MUTEX(cfg80211_mutex); |
| |
| /* for debugfs */ |
| static struct dentry *ieee80211_debugfs_dir; |
| |
| /* requires cfg80211_mutex to be held! */ |
| struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx) |
| { |
| struct cfg80211_registered_device *result = NULL, *drv; |
| |
| if (!wiphy_idx_valid(wiphy_idx)) |
| return NULL; |
| |
| assert_cfg80211_lock(); |
| |
| list_for_each_entry(drv, &cfg80211_drv_list, list) { |
| if (drv->wiphy_idx == wiphy_idx) { |
| result = drv; |
| break; |
| } |
| } |
| |
| return result; |
| } |
| |
| int get_wiphy_idx(struct wiphy *wiphy) |
| { |
| struct cfg80211_registered_device *drv; |
| if (!wiphy) |
| return WIPHY_IDX_STALE; |
| drv = wiphy_to_dev(wiphy); |
| return drv->wiphy_idx; |
| } |
| |
| /* requires cfg80211_drv_mutex to be held! */ |
| struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) |
| { |
| struct cfg80211_registered_device *drv; |
| |
| if (!wiphy_idx_valid(wiphy_idx)) |
| return NULL; |
| |
| assert_cfg80211_lock(); |
| |
| drv = cfg80211_drv_by_wiphy_idx(wiphy_idx); |
| if (!drv) |
| return NULL; |
| return &drv->wiphy; |
| } |
| |
| /* requires cfg80211_mutex to be held! */ |
| struct cfg80211_registered_device * |
| __cfg80211_drv_from_info(struct genl_info *info) |
| { |
| int ifindex; |
| struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; |
| struct net_device *dev; |
| int err = -EINVAL; |
| |
| assert_cfg80211_lock(); |
| |
| if (info->attrs[NL80211_ATTR_WIPHY]) { |
| bywiphyidx = cfg80211_drv_by_wiphy_idx( |
| nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); |
| err = -ENODEV; |
| } |
| |
| if (info->attrs[NL80211_ATTR_IFINDEX]) { |
| ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); |
| dev = dev_get_by_index(&init_net, ifindex); |
| if (dev) { |
| if (dev->ieee80211_ptr) |
| byifidx = |
| wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
| dev_put(dev); |
| } |
| err = -ENODEV; |
| } |
| |
| if (bywiphyidx && byifidx) { |
| if (bywiphyidx != byifidx) |
| return ERR_PTR(-EINVAL); |
| else |
| return bywiphyidx; /* == byifidx */ |
| } |
| if (bywiphyidx) |
| return bywiphyidx; |
| |
| if (byifidx) |
| return byifidx; |
| |
| return ERR_PTR(err); |
| } |
| |
| struct cfg80211_registered_device * |
| cfg80211_get_dev_from_info(struct genl_info *info) |
| { |
| struct cfg80211_registered_device *drv; |
| |
| mutex_lock(&cfg80211_mutex); |
| drv = __cfg80211_drv_from_info(info); |
| |
| /* if it is not an error we grab the lock on |
| * it to assure it won't be going away while |
| * we operate on it */ |
| if (!IS_ERR(drv)) |
| mutex_lock(&drv->mtx); |
| |
| mutex_unlock(&cfg80211_mutex); |
| |
| return drv; |
| } |
| |
| struct cfg80211_registered_device * |
| cfg80211_get_dev_from_ifindex(int ifindex) |
| { |
| struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV); |
| struct net_device *dev; |
| |
| mutex_lock(&cfg80211_mutex); |
| dev = dev_get_by_index(&init_net, ifindex); |
| if (!dev) |
| goto out; |
| if (dev->ieee80211_ptr) { |
| drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
| mutex_lock(&drv->mtx); |
| } else |
| drv = ERR_PTR(-ENODEV); |
| dev_put(dev); |
| out: |
| mutex_unlock(&cfg80211_mutex); |
| return drv; |
| } |
| |
| void cfg80211_put_dev(struct cfg80211_registered_device *drv) |
| { |
| BUG_ON(IS_ERR(drv)); |
| mutex_unlock(&drv->mtx); |
| } |
| |
| /* requires cfg80211_mutex to be held */ |
| int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, |
| char *newname) |
| { |
| struct cfg80211_registered_device *drv; |
| int wiphy_idx, taken = -1, result, digits; |
| |
| assert_cfg80211_lock(); |
| |
| /* prohibit calling the thing phy%d when %d is not its number */ |
| sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); |
| if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { |
| /* count number of places needed to print wiphy_idx */ |
| digits = 1; |
| while (wiphy_idx /= 10) |
| digits++; |
| /* |
| * deny the name if it is phy<idx> where <idx> is printed |
| * without leading zeroes. taken == strlen(newname) here |
| */ |
| if (taken == strlen(PHY_NAME) + digits) |
| return -EINVAL; |
| } |
| |
| |
| /* Ignore nop renames */ |
| if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) |
| return 0; |
| |
| /* Ensure another device does not already have this name. */ |
| list_for_each_entry(drv, &cfg80211_drv_list, list) |
| if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0) |
| return -EINVAL; |
| |
| result = device_rename(&rdev->wiphy.dev, newname); |
| if (result) |
| return result; |
| |
| if (rdev->wiphy.debugfsdir && |
| !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, |
| rdev->wiphy.debugfsdir, |
| rdev->wiphy.debugfsdir->d_parent, |
| newname)) |
| printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", |
| newname); |
| |
| nl80211_notify_dev_rename(rdev); |
| |
| return 0; |
| } |
| |
| /* exported functions */ |
| |
| struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) |
| { |
| static int wiphy_counter; |
| |
| struct cfg80211_registered_device *drv; |
| int alloc_size; |
| |
| WARN_ON(!ops->add_key && ops->del_key); |
| WARN_ON(ops->add_key && !ops->del_key); |
| |
| alloc_size = sizeof(*drv) + sizeof_priv; |
| |
| drv = kzalloc(alloc_size, GFP_KERNEL); |
| if (!drv) |
| return NULL; |
| |
| drv->ops = ops; |
| |
| mutex_lock(&cfg80211_mutex); |
| |
| drv->wiphy_idx = wiphy_counter++; |
| |
| if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) { |
| wiphy_counter--; |
| mutex_unlock(&cfg80211_mutex); |
| /* ugh, wrapped! */ |
| kfree(drv); |
| return NULL; |
| } |
| |
| mutex_unlock(&cfg80211_mutex); |
| |
| /* give it a proper name */ |
| dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx); |
| |
| mutex_init(&drv->mtx); |
| mutex_init(&drv->devlist_mtx); |
| INIT_LIST_HEAD(&drv->netdev_list); |
| spin_lock_init(&drv->bss_lock); |
| INIT_LIST_HEAD(&drv->bss_list); |
| |
| device_initialize(&drv->wiphy.dev); |
| drv->wiphy.dev.class = &ieee80211_class; |
| drv->wiphy.dev.platform_data = drv; |
| |
| /* |
| * Initialize wiphy parameters to IEEE 802.11 MIB default values. |
| * Fragmentation and RTS threshold are disabled by default with the |
| * special -1 value. |
| */ |
| drv->wiphy.retry_short = 7; |
| drv->wiphy.retry_long = 4; |
| drv->wiphy.frag_threshold = (u32) -1; |
| drv->wiphy.rts_threshold = (u32) -1; |
| |
| return &drv->wiphy; |
| } |
| EXPORT_SYMBOL(wiphy_new); |
| |
| int wiphy_register(struct wiphy *wiphy) |
| { |
| struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); |
| int res; |
| enum ieee80211_band band; |
| struct ieee80211_supported_band *sband; |
| bool have_band = false; |
| int i; |
| u16 ifmodes = wiphy->interface_modes; |
| |
| if (WARN_ON(wiphy->max_scan_ssids < 1)) |
| return -EINVAL; |
| |
| /* sanity check ifmodes */ |
| WARN_ON(!ifmodes); |
| ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; |
| if (WARN_ON(ifmodes != wiphy->interface_modes)) |
| wiphy->interface_modes = ifmodes; |
| |
| /* sanity check supported bands/channels */ |
| for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| sband = wiphy->bands[band]; |
| if (!sband) |
| continue; |
| |
| sband->band = band; |
| |
| if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) |
| return -EINVAL; |
| |
| /* |
| * Since we use a u32 for rate bitmaps in |
| * ieee80211_get_response_rate, we cannot |
| * have more than 32 legacy rates. |
| */ |
| if (WARN_ON(sband->n_bitrates > 32)) |
| return -EINVAL; |
| |
| for (i = 0; i < sband->n_channels; i++) { |
| sband->channels[i].orig_flags = |
| sband->channels[i].flags; |
| sband->channels[i].orig_mag = |
| sband->channels[i].max_antenna_gain; |
| sband->channels[i].orig_mpwr = |
| sband->channels[i].max_power; |
| sband->channels[i].band = band; |
| } |
| |
| have_band = true; |
| } |
| |
| if (!have_band) { |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| |
| /* check and set up bitrates */ |
| ieee80211_set_bitrate_flags(wiphy); |
| |
| mutex_lock(&cfg80211_mutex); |
| |
| /* set up regulatory info */ |
| wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); |
| |
| res = device_add(&drv->wiphy.dev); |
| if (res) |
| goto out_unlock; |
| |
| list_add(&drv->list, &cfg80211_drv_list); |
| |
| /* add to debugfs */ |
| drv->wiphy.debugfsdir = |
| debugfs_create_dir(wiphy_name(&drv->wiphy), |
| ieee80211_debugfs_dir); |
| if (IS_ERR(drv->wiphy.debugfsdir)) |
| drv->wiphy.debugfsdir = NULL; |
| |
| if (wiphy->custom_regulatory) { |
| struct regulatory_request request; |
| |
| request.wiphy_idx = get_wiphy_idx(wiphy); |
| request.initiator = NL80211_REGDOM_SET_BY_DRIVER; |
| request.alpha2[0] = '9'; |
| request.alpha2[1] = '9'; |
| |
| nl80211_send_reg_change_event(&request); |
| } |
| |
| res = 0; |
| out_unlock: |
| mutex_unlock(&cfg80211_mutex); |
| return res; |
| } |
| EXPORT_SYMBOL(wiphy_register); |
| |
| void wiphy_unregister(struct wiphy *wiphy) |
| { |
| struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); |
| |
| /* protect the device list */ |
| mutex_lock(&cfg80211_mutex); |
| |
| BUG_ON(!list_empty(&drv->netdev_list)); |
| |
| /* |
| * Try to grab drv->mtx. If a command is still in progress, |
| * hopefully the driver will refuse it since it's tearing |
| * down the device already. We wait for this command to complete |
| * before unlinking the item from the list. |
| * Note: as codified by the BUG_ON above we cannot get here if |
| * a virtual interface is still associated. Hence, we can only |
| * get to lock contention here if userspace issues a command |
| * that identified the hardware by wiphy index. |
| */ |
| mutex_lock(&drv->mtx); |
| /* unlock again before freeing */ |
| mutex_unlock(&drv->mtx); |
| |
| /* If this device got a regulatory hint tell core its |
| * free to listen now to a new shiny device regulatory hint */ |
| reg_device_remove(wiphy); |
| |
| list_del(&drv->list); |
| device_del(&drv->wiphy.dev); |
| debugfs_remove(drv->wiphy.debugfsdir); |
| |
| mutex_unlock(&cfg80211_mutex); |
| } |
| EXPORT_SYMBOL(wiphy_unregister); |
| |
| void cfg80211_dev_free(struct cfg80211_registered_device *drv) |
| { |
| struct cfg80211_internal_bss *scan, *tmp; |
| mutex_destroy(&drv->mtx); |
| mutex_destroy(&drv->devlist_mtx); |
| list_for_each_entry_safe(scan, tmp, &drv->bss_list, list) |
| cfg80211_put_bss(&scan->pub); |
| kfree(drv); |
| } |
| |
| void wiphy_free(struct wiphy *wiphy) |
| { |
| put_device(&wiphy->dev); |
| } |
| EXPORT_SYMBOL(wiphy_free); |
| |
| 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 0; |
| |
| 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; |
| 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.ssid_len) |
| break; |
| cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext); |
| 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; |
| } |
| |
| return 0; |
| } |
| |
| 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); |