667503ddcb
Over time, a lot of locking issues have crept into the smarts of cfg80211, so e.g. scan completion can race against a new scan, IBSS join can race against leaving an IBSS, etc. Introduce a new per-interface lock that protects most of the per-interface data that we need to keep track of, and sprinkle assertions about that lock everywhere. Some things now need to be offloaded to work structs so that we don't require being able to sleep in functions the drivers call. The exception to that are the MLME callbacks (rx_auth etc.) that currently only mac80211 calls because it was easier to do that there instead of in cfg80211, and future drivers implementing those calls will, if they ever exist, probably need to use a similar scheme like mac80211 anyway... In order to be able to handle _deauth and _disassoc properly, introduce a cookie passed to it that will determine locking requirements. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
446 lines
10 KiB
C
446 lines
10 KiB
C
/*
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* Some IBSS support code for cfg80211.
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*
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <net/cfg80211.h>
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#include "nl80211.h"
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void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_bss *bss;
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#ifdef CONFIG_WIRELESS_EXT
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union iwreq_data wrqu;
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#endif
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return;
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if (WARN_ON(!wdev->ssid_len))
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return;
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bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
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wdev->ssid, wdev->ssid_len,
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WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
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if (WARN_ON(!bss))
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return;
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if (wdev->current_bss) {
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cfg80211_unhold_bss(wdev->current_bss);
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cfg80211_put_bss(&wdev->current_bss->pub);
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}
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cfg80211_hold_bss(bss_from_pub(bss));
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wdev->current_bss = bss_from_pub(bss);
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nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid,
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GFP_KERNEL);
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#ifdef CONFIG_WIRELESS_EXT
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memset(&wrqu, 0, sizeof(wrqu));
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memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
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wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
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#endif
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}
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void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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struct cfg80211_event *ev;
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unsigned long flags;
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ev = kzalloc(sizeof(*ev), gfp);
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if (!ev)
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return;
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ev->type = EVENT_IBSS_JOINED;
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memcpy(ev->cr.bssid, bssid, ETH_ALEN);
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spin_lock_irqsave(&wdev->event_lock, flags);
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list_add_tail(&ev->list, &wdev->event_list);
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spin_unlock_irqrestore(&wdev->event_lock, flags);
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schedule_work(&rdev->event_work);
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}
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EXPORT_SYMBOL(cfg80211_ibss_joined);
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int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev,
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struct cfg80211_ibss_params *params)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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ASSERT_WDEV_LOCK(wdev);
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if (wdev->ssid_len)
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return -EALREADY;
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#ifdef CONFIG_WIRELESS_EXT
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wdev->wext.ibss.channel = params->channel;
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#endif
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err = rdev->ops->join_ibss(&rdev->wiphy, dev, params);
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if (err)
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return err;
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memcpy(wdev->ssid, params->ssid, params->ssid_len);
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wdev->ssid_len = params->ssid_len;
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return 0;
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}
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int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev,
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struct cfg80211_ibss_params *params)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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wdev_lock(wdev);
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err = __cfg80211_join_ibss(rdev, dev, params);
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wdev_unlock(wdev);
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return err;
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}
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static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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ASSERT_WDEV_LOCK(wdev);
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if (wdev->current_bss) {
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cfg80211_unhold_bss(wdev->current_bss);
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cfg80211_put_bss(&wdev->current_bss->pub);
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}
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wdev->current_bss = NULL;
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wdev->ssid_len = 0;
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#ifdef CONFIG_WIRELESS_EXT
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if (!nowext)
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wdev->wext.ibss.ssid_len = 0;
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#endif
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}
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void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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wdev_lock(wdev);
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__cfg80211_clear_ibss(dev, nowext);
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wdev_unlock(wdev);
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}
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static int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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ASSERT_WDEV_LOCK(wdev);
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if (!wdev->ssid_len)
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return -ENOLINK;
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err = rdev->ops->leave_ibss(&rdev->wiphy, dev);
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if (err)
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return err;
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__cfg80211_clear_ibss(dev, nowext);
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return 0;
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}
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int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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wdev_lock(wdev);
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err = __cfg80211_leave_ibss(rdev, dev, nowext);
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wdev_unlock(wdev);
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return err;
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}
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#ifdef CONFIG_WIRELESS_EXT
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static int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
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struct wireless_dev *wdev)
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{
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enum ieee80211_band band;
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int i;
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if (!wdev->wext.ibss.beacon_interval)
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wdev->wext.ibss.beacon_interval = 100;
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/* try to find an IBSS channel if none requested ... */
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if (!wdev->wext.ibss.channel) {
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for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
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struct ieee80211_supported_band *sband;
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struct ieee80211_channel *chan;
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sband = rdev->wiphy.bands[band];
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if (!sband)
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continue;
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for (i = 0; i < sband->n_channels; i++) {
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chan = &sband->channels[i];
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if (chan->flags & IEEE80211_CHAN_NO_IBSS)
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continue;
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if (chan->flags & IEEE80211_CHAN_DISABLED)
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continue;
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wdev->wext.ibss.channel = chan;
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break;
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}
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if (wdev->wext.ibss.channel)
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break;
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}
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if (!wdev->wext.ibss.channel)
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return -EINVAL;
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}
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/* don't join -- SSID is not there */
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if (!wdev->wext.ibss.ssid_len)
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return 0;
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if (!netif_running(wdev->netdev))
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return 0;
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return cfg80211_join_ibss(wiphy_to_dev(wdev->wiphy),
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wdev->netdev, &wdev->wext.ibss);
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}
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int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *freq, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct ieee80211_channel *chan;
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int err;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
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return -EOPNOTSUPP;
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chan = cfg80211_wext_freq(wdev->wiphy, freq);
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if (chan && IS_ERR(chan))
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return PTR_ERR(chan);
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if (chan &&
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(chan->flags & IEEE80211_CHAN_NO_IBSS ||
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chan->flags & IEEE80211_CHAN_DISABLED))
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return -EINVAL;
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if (wdev->wext.ibss.channel == chan)
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return 0;
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wdev_lock(wdev);
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err = 0;
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if (wdev->ssid_len)
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err = __cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
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dev, true);
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wdev_unlock(wdev);
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if (err)
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return err;
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if (chan) {
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wdev->wext.ibss.channel = chan;
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wdev->wext.ibss.channel_fixed = true;
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} else {
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/* cfg80211_ibss_wext_join will pick one if needed */
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wdev->wext.ibss.channel_fixed = false;
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}
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return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
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}
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/* temporary symbol - mark GPL - in the future the handler won't be */
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EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwfreq);
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int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *freq, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct ieee80211_channel *chan = NULL;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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wdev_lock(wdev);
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if (wdev->current_bss)
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chan = wdev->current_bss->pub.channel;
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else if (wdev->wext.ibss.channel)
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chan = wdev->wext.ibss.channel;
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wdev_unlock(wdev);
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if (chan) {
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freq->m = chan->center_freq;
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freq->e = 6;
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return 0;
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}
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/* no channel if not joining */
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return -EINVAL;
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}
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/* temporary symbol - mark GPL - in the future the handler won't be */
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EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwfreq);
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int cfg80211_ibss_wext_siwessid(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *ssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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size_t len = data->length;
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int err;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
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return -EOPNOTSUPP;
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wdev_lock(wdev);
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err = 0;
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if (wdev->ssid_len)
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err = __cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
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dev, true);
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wdev_unlock(wdev);
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if (err)
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return err;
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/* iwconfig uses nul termination in SSID.. */
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if (len > 0 && ssid[len - 1] == '\0')
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len--;
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wdev->wext.ibss.ssid = wdev->ssid;
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memcpy(wdev->wext.ibss.ssid, ssid, len);
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wdev->wext.ibss.ssid_len = len;
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return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
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}
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/* temporary symbol - mark GPL - in the future the handler won't be */
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EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwessid);
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int cfg80211_ibss_wext_giwessid(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *ssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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data->flags = 0;
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wdev_lock(wdev);
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if (wdev->ssid_len) {
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data->flags = 1;
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data->length = wdev->ssid_len;
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memcpy(ssid, wdev->ssid, data->length);
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} else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
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data->flags = 1;
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data->length = wdev->wext.ibss.ssid_len;
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memcpy(ssid, wdev->wext.ibss.ssid, data->length);
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}
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wdev_unlock(wdev);
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return 0;
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}
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/* temporary symbol - mark GPL - in the future the handler won't be */
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EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwessid);
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int cfg80211_ibss_wext_siwap(struct net_device *dev,
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struct iw_request_info *info,
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struct sockaddr *ap_addr, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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u8 *bssid = ap_addr->sa_data;
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int err;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
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return -EOPNOTSUPP;
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if (ap_addr->sa_family != ARPHRD_ETHER)
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return -EINVAL;
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/* automatic mode */
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if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
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bssid = NULL;
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/* both automatic */
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if (!bssid && !wdev->wext.ibss.bssid)
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return 0;
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/* fixed already - and no change */
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if (wdev->wext.ibss.bssid && bssid &&
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compare_ether_addr(bssid, wdev->wext.ibss.bssid) == 0)
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return 0;
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wdev_lock(wdev);
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err = 0;
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if (wdev->ssid_len)
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err = __cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
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dev, true);
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wdev_unlock(wdev);
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if (err)
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return err;
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if (bssid) {
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memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
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wdev->wext.ibss.bssid = wdev->wext.bssid;
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} else
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wdev->wext.ibss.bssid = NULL;
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return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
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}
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/* temporary symbol - mark GPL - in the future the handler won't be */
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EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwap);
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int cfg80211_ibss_wext_giwap(struct net_device *dev,
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struct iw_request_info *info,
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struct sockaddr *ap_addr, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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ap_addr->sa_family = ARPHRD_ETHER;
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wdev_lock(wdev);
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if (wdev->current_bss)
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memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
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else
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memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
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wdev_unlock(wdev);
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return 0;
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}
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/* temporary symbol - mark GPL - in the future the handler won't be */
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EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwap);
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#endif
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