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Commit 37c73b5f authored by Ben Greear's avatar Ben Greear Committed by Johannes Berg
Browse files

cfg80211: allow registering more than one beacon listener 



The commit:

commit 5e760230
Author: Johannes Berg <johannes.berg@intel.com>
Date:   Fri Nov 4 11:18:17 2011 +0100

    cfg80211: allow registering to beacons

allowed only a single process to register for beacon events
per wiphy.  This breaks cases where a user may want two or
more VIFs on a wiphy and run a seperate hostapd process on
each vif.

This patch allows multiple beacon listeners, fixing the
regression.

Signed-off-by: default avatarBen Greear <greearb@candelatech.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 391e53e3

include/net/cfg80211.h

+1 −2
Original line number Diff line number Diff line
@@ -3560,7 +3560,6 @@ void cfg80211_probe_status(struct net_device *dev, const u8 *addr, 
 * @len: length of the frame

 * @freq: frequency the frame was received on

 * @sig_dbm: signal strength in mBm, or 0 if unknown

 * @gfp: allocation flags

 *

 * Use this function to report to userspace when a beacon was

 * received. It is not useful to call this when there is no
@@ -3568,7 +3567,7 @@ void cfg80211_probe_status(struct net_device *dev, const u8 *addr, 
 */

void cfg80211_report_obss_beacon(struct wiphy *wiphy,

				 const u8 *frame, size_t len,

				 int freq, int sig_dbm, gfp_t gfp);

				 int freq, int sig_dbm);



/**

 * cfg80211_can_beacon_sec_chan - test if ht40 on extension channel can be used

net/mac80211/rx.c

+1 −1
Original line number Diff line number Diff line
@@ -2200,7 +2200,7 @@ ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 


		cfg80211_report_obss_beacon(rx->local->hw.wiphy,

					    rx->skb->data, rx->skb->len,

					    status->freq, sig, GFP_ATOMIC);

					    status->freq, sig);

		rx->flags |= IEEE80211_RX_BEACON_REPORTED;

	}

net/wireless/core.c

+7 −0
Original line number Diff line number Diff line
@@ -326,6 +326,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 
	mutex_init(&rdev->devlist_mtx);

	mutex_init(&rdev->sched_scan_mtx);

	INIT_LIST_HEAD(&rdev->wdev_list);

	INIT_LIST_HEAD(&rdev->beacon_registrations);

	spin_lock_init(&rdev->beacon_registrations_lock);

	spin_lock_init(&rdev->bss_lock);

	INIT_LIST_HEAD(&rdev->bss_list);

	INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
@@ -698,10 +700,15 @@ EXPORT_SYMBOL(wiphy_unregister); 
void cfg80211_dev_free(struct cfg80211_registered_device *rdev)

{

	struct cfg80211_internal_bss *scan, *tmp;

	struct cfg80211_beacon_registration *reg, *treg;

	rfkill_destroy(rdev->rfkill);

	mutex_destroy(&rdev->mtx);

	mutex_destroy(&rdev->devlist_mtx);

	mutex_destroy(&rdev->sched_scan_mtx);

	list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {

		list_del(&reg->list);

		kfree(reg);

	}

	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)

		cfg80211_put_bss(&scan->pub);

	kfree(rdev);

net/wireless/core.h

+6 −1
Original line number Diff line number Diff line
@@ -55,7 +55,8 @@ struct cfg80211_registered_device { 
	int opencount; /* also protected by devlist_mtx */

	wait_queue_head_t dev_wait;



	u32 ap_beacons_nlportid;

	struct list_head beacon_registrations;

	spinlock_t beacon_registrations_lock;



	/* protected by RTNL only */

	int num_running_ifaces;
@@ -260,6 +261,10 @@ enum cfg80211_chan_mode { 
	CHAN_MODE_EXCLUSIVE,

};



struct cfg80211_beacon_registration {

	struct list_head list;

	u32 nlportid;

};



/* free object */

extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);

net/wireless/nl80211.c

+60 −28
Original line number Diff line number Diff line
@@ -6934,16 +6934,35 @@ static int nl80211_probe_client(struct sk_buff *skb, 
static int nl80211_register_beacons(struct sk_buff *skb, struct genl_info *info)

{

	struct cfg80211_registered_device *rdev = info->user_ptr[0];

	struct cfg80211_beacon_registration *reg, *nreg;

	int rv;



	if (!(rdev->wiphy.flags & WIPHY_FLAG_REPORTS_OBSS))

		return -EOPNOTSUPP;



	if (rdev->ap_beacons_nlportid)

		return -EBUSY;

	nreg = kzalloc(sizeof(*nreg), GFP_KERNEL);

	if (!nreg)

		return -ENOMEM;



	rdev->ap_beacons_nlportid = info->snd_portid;

	/* First, check if already registered. */

	spin_lock_bh(&rdev->beacon_registrations_lock);

	list_for_each_entry(reg, &rdev->beacon_registrations, list) {

		if (reg->nlportid == info->snd_portid) {

			rv = -EALREADY;

			goto out_err;

		}

	}

	/* Add it to the list */

	nreg->nlportid = info->snd_portid;

	list_add(&nreg->list, &rdev->beacon_registrations);



	spin_unlock_bh(&rdev->beacon_registrations_lock);



	return 0;

out_err:

	spin_unlock_bh(&rdev->beacon_registrations_lock);

	kfree(nreg);

	return rv;

}



static int nl80211_start_p2p_device(struct sk_buff *skb, struct genl_info *info)
@@ -8957,27 +8976,26 @@ EXPORT_SYMBOL(cfg80211_probe_status); 


void cfg80211_report_obss_beacon(struct wiphy *wiphy,

				 const u8 *frame, size_t len,

				 int freq, int sig_dbm, gfp_t gfp)

				 int freq, int sig_dbm)

{

	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);

	struct sk_buff *msg;

	void *hdr;

	u32 nlportid = ACCESS_ONCE(rdev->ap_beacons_nlportid);

	struct cfg80211_beacon_registration *reg;



	trace_cfg80211_report_obss_beacon(wiphy, frame, len, freq, sig_dbm);



	if (!nlportid)

		return;



	msg = nlmsg_new(len + 100, gfp);

	if (!msg)

	spin_lock_bh(&rdev->beacon_registrations_lock);

	list_for_each_entry(reg, &rdev->beacon_registrations, list) {

		msg = nlmsg_new(len + 100, GFP_ATOMIC);

		if (!msg) {

			spin_unlock_bh(&rdev->beacon_registrations_lock);

			return;

		}



		hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_FRAME);

	if (!hdr) {

		nlmsg_free(msg);

		return;

	}

		if (!hdr)

			goto nla_put_failure;



		if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||

		    (freq &&
@@ -8989,10 +9007,14 @@ void cfg80211_report_obss_beacon(struct wiphy *wiphy, 


		genlmsg_end(msg, hdr);



	genlmsg_unicast(wiphy_net(&rdev->wiphy), msg, nlportid);

		genlmsg_unicast(wiphy_net(&rdev->wiphy), msg, reg->nlportid);

	}

	spin_unlock_bh(&rdev->beacon_registrations_lock);

	return;



 nla_put_failure:

	spin_unlock_bh(&rdev->beacon_registrations_lock);

	if (hdr)

		genlmsg_cancel(msg, hdr);

	nlmsg_free(msg);

}
@@ -9005,6 +9027,7 @@ static int nl80211_netlink_notify(struct notifier_block * nb, 
	struct netlink_notify *notify = _notify;

	struct cfg80211_registered_device *rdev;

	struct wireless_dev *wdev;

	struct cfg80211_beacon_registration *reg, *tmp;



	if (state != NETLINK_URELEASE)

		return NOTIFY_DONE;
@@ -9014,8 +9037,17 @@ static int nl80211_netlink_notify(struct notifier_block * nb, 
	list_for_each_entry_rcu(rdev, &cfg80211_rdev_list, list) {

		list_for_each_entry_rcu(wdev, &rdev->wdev_list, list)

			cfg80211_mlme_unregister_socket(wdev, notify->portid);

		if (rdev->ap_beacons_nlportid == notify->portid)

			rdev->ap_beacons_nlportid = 0;



		spin_lock_bh(&rdev->beacon_registrations_lock);

		list_for_each_entry_safe(reg, tmp, &rdev->beacon_registrations,

					 list) {

			if (reg->nlportid == notify->portid) {

				list_del(&reg->list);

				kfree(reg);

				break;

			}

		}

		spin_unlock_bh(&rdev->beacon_registrations_lock);

	}



	rcu_read_unlock();