forked from Minki/linux
f444de05d2
Currently (all tested with hwsim) you can do stupid things like setting up an AP on a certain channel, then adding another virtual interface and making that associate on another channel -- this will make the beaconing to move channel but obviously without the necessary IEs data update. In order to improve this situation, first make the configuration APIs (cfg80211 and nl80211) aware of multi-channel operation -- we'll eventually need that in the future anyway. There's one userland API change and one API addition. The API change is that now SET_WIPHY must be called with virtual interface index rather than only wiphy index in order to take effect for that interface -- luckily all current users (hostapd) do that. For monitor interfaces, the old setting is preserved, but monitors are always slaved to other devices anyway so no guarantees. The second userland API change is the introduction of a per virtual interface SET_CHANNEL command, that hostapd should use going forward to make it easier to understand what's going on (it can automatically detect a kernel with this command). Other than mac80211, no existing cfg80211 drivers are affected by this change because they only allow a single virtual interface. mac80211, however, now needs to be aware that the channel settings are per interface now, and needs to disallow (for now) real multi-channel operation, which is another important part of this patch. One of the immediate benefits is that you can now start hostapd to operate on a hardware that already has a connection on another virtual interface, as long as you specify the same channel. Note that two things are left unhandled (this is an improvement -- not a complete fix): * different HT/no-HT modes currently you could start an HT AP and then connect to a non-HT network on the same channel which would configure the hardware for no HT; that can be fixed fairly easily * CSA An AP we're connected to on a virtual interface might indicate switching channels, and in that case we would follow it, regardless of how many other interfaces are operating; this requires more effort to fix but is pretty rare after all Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
505 lines
11 KiB
C
505 lines
11 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 "wext-compat.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_CFG80211_WEXT
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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 (!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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cfg80211_upload_connect_keys(wdev);
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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_CFG80211_WEXT
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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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CFG80211_DEV_WARN_ON(!wdev->ssid_len);
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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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queue_work(cfg80211_wq, &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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struct cfg80211_cached_keys *connkeys)
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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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if (WARN_ON(wdev->connect_keys))
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kfree(wdev->connect_keys);
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wdev->connect_keys = connkeys;
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#ifdef CONFIG_CFG80211_WEXT
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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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wdev->connect_keys = NULL;
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return err;
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}
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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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struct cfg80211_cached_keys *connkeys)
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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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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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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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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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int i;
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ASSERT_WDEV_LOCK(wdev);
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kfree(wdev->connect_keys);
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wdev->connect_keys = NULL;
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/*
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* Delete all the keys ... pairwise keys can't really
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* exist any more anyway, but default keys might.
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*/
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if (rdev->ops->del_key)
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for (i = 0; i < 6; i++)
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rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
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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_CFG80211_WEXT
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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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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_CFG80211_WEXT
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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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struct cfg80211_cached_keys *ck = NULL;
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enum ieee80211_band band;
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int i, err;
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ASSERT_WDEV_LOCK(wdev);
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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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if (wdev->wext.keys)
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wdev->wext.keys->def = wdev->wext.default_key;
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wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
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if (wdev->wext.keys) {
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ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
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if (!ck)
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return -ENOMEM;
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for (i = 0; i < 6; i++)
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ck->params[i].key = ck->data[i];
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}
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err = __cfg80211_join_ibss(rdev, wdev->netdev,
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&wdev->wext.ibss, ck);
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if (err)
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kfree(ck);
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return err;
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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 *wextfreq, char *extra)
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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 ieee80211_channel *chan = NULL;
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int err, freq;
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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 (!rdev->ops->join_ibss)
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return -EOPNOTSUPP;
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freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
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if (freq < 0)
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return freq;
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if (freq) {
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chan = ieee80211_get_channel(wdev->wiphy, freq);
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if (!chan)
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return -EINVAL;
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if (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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}
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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(rdev, 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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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = cfg80211_ibss_wext_join(rdev, wdev);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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return err;
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}
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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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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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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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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 (!rdev->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(rdev, 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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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = cfg80211_ibss_wext_join(rdev, wdev);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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return err;
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}
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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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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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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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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 (!rdev->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(rdev, 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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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = cfg80211_ibss_wext_join(rdev, wdev);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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return err;
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}
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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))
|
|
return -EINVAL;
|
|
|
|
ap_addr->sa_family = ARPHRD_ETHER;
|
|
|
|
wdev_lock(wdev);
|
|
if (wdev->current_bss)
|
|
memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
|
|
else if (wdev->wext.ibss.bssid)
|
|
memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
|
|
else
|
|
memset(ap_addr->sa_data, 0, ETH_ALEN);
|
|
|
|
wdev_unlock(wdev);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|