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Commit be038b37 authored by Assaf Krauss's avatar Assaf Krauss Committed by John W. Linville
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mac80211: Checking IBSS support while changing channel in ad-hoc mode 



This patch adds a check to the set_channel flow. When attempting to change
the channel while in IBSS mode, and the new channel does not support IBSS
mode, the flow return with an error value with no consequences on the
mac80211 and driver state.

Signed-off-by: default avatarAssaf Krauss <assaf.krauss@intel.com>
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 872ba533

net/mac80211/ieee80211_i.h

+1 −1
Original line number Diff line number Diff line
@@ -899,7 +899,7 @@ extern const struct iw_handler_def ieee80211_iw_handler_def; 




/* ieee80211_ioctl.c */

int ieee80211_set_freq(struct ieee80211_local *local, int freq);

int ieee80211_set_freq(struct net_device *dev, int freq);

/* ieee80211_sta.c */

void ieee80211_sta_timer(unsigned long data);

void ieee80211_sta_work(struct work_struct *work);

net/mac80211/mlme.c

+4 −7
Original line number Diff line number Diff line
@@ -2359,13 +2359,10 @@ static int ieee80211_sta_join_ibss(struct net_device *dev, 
	sdata->drop_unencrypted = bss->capability &

		WLAN_CAPABILITY_PRIVACY ? 1 : 0;



	res = ieee80211_set_freq(local, bss->freq);

	res = ieee80211_set_freq(dev, bss->freq);



	if (local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS) {

		printk(KERN_DEBUG "%s: IBSS not allowed on frequency "

		       "%d MHz\n", dev->name, local->oper_channel->center_freq);

		return -1;

	}

	if (res)

		return res;



	/* Set beacon template */

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
@@ -3491,7 +3488,7 @@ static int ieee80211_sta_config_auth(struct net_device *dev, 
	spin_unlock_bh(&local->sta_bss_lock);



	if (selected) {

		ieee80211_set_freq(local, selected->freq);

		ieee80211_set_freq(dev, selected->freq);

		if (!(ifsta->flags & IEEE80211_STA_SSID_SET))

			ieee80211_sta_set_ssid(dev, selected->ssid,

					       selected->ssid_len);

net/mac80211/wext.c

+11 −4
Original line number Diff line number Diff line
@@ -290,14 +290,22 @@ static int ieee80211_ioctl_giwmode(struct net_device *dev, 
	return 0;

}



int ieee80211_set_freq(struct ieee80211_local *local, int freqMHz)

int ieee80211_set_freq(struct net_device *dev, int freqMHz)

{

	int ret = -EINVAL;

	struct ieee80211_channel *chan;

	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);



	chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);



	if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {

		if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&

		    chan->flags & IEEE80211_CHAN_NO_IBSS) {

			printk(KERN_DEBUG "%s: IBSS not allowed on frequency "

				"%d MHz\n", dev->name, chan->center_freq);

			return ret;

		}

		local->oper_channel = chan;



		if (local->sta_sw_scanning || local->sta_hw_scanning)
@@ -315,7 +323,6 @@ static int ieee80211_ioctl_siwfreq(struct net_device *dev, 
				   struct iw_request_info *info,

				   struct iw_freq *freq, char *extra)

{

	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);



	if (sdata->vif.type == IEEE80211_IF_TYPE_STA)
@@ -329,14 +336,14 @@ static int ieee80211_ioctl_siwfreq(struct net_device *dev, 
					IEEE80211_STA_AUTO_CHANNEL_SEL;

			return 0;

		} else

			return ieee80211_set_freq(local,

			return ieee80211_set_freq(dev,

				ieee80211_channel_to_frequency(freq->m));

	} else {

		int i, div = 1000000;

		for (i = 0; i < freq->e; i++)

			div /= 10;

		if (div > 0)

			return ieee80211_set_freq(local, freq->m / div);

			return ieee80211_set_freq(dev, freq->m / div);

		else

			return -EINVAL;

	}