path: root/net/wireless/sme.c

/*
 * SME code for cfg80211's connect emulation.
 *
 * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
 * Copyright (C) 2009   Intel Corporation. All rights reserved.
 */

#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>
#include "nl80211.h"
#include "reg.h"

struct cfg80211_conn {
	struct cfg80211_connect_params params;
	/* these are sub-states of the _CONNECTING sme_state */
	enum {
		CFG80211_CONN_IDLE,
		CFG80211_CONN_SCANNING,
		CFG80211_CONN_SCAN_AGAIN,
		CFG80211_CONN_AUTHENTICATE_NEXT,
		CFG80211_CONN_AUTHENTICATING,
		CFG80211_CONN_ASSOCIATE_NEXT,
		CFG80211_CONN_ASSOCIATING,
		CFG80211_CONN_DEAUTH_ASSOC_FAIL,
	} state;
	u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
	u8 *ie;
	size_t ie_len;
	bool auto_auth, prev_bssid_valid;
};

static bool cfg80211_is_all_idle(void)
{
	struct cfg80211_registered_device *rdev;
	struct wireless_dev *wdev;
	bool is_all_idle = true;

	mutex_lock(&cfg80211_mutex);

	/*
	 * All devices must be idle as otherwise if you are actively
	 * scanning some new beacon hints could be learned and would
	 * count as new regulatory hints.
	 */
	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		cfg80211_lock_rdev(rdev);
		list_for_each_entry(wdev, &rdev->netdev_list, list) {
			wdev_lock(wdev);
			if (wdev->sme_state != CFG80211_SME_IDLE)
				is_all_idle = false;
			wdev_unlock(wdev);
		}
		cfg80211_unlock_rdev(rdev);
	}

	mutex_unlock(&cfg80211_mutex);

	return is_all_idle;
}

static void disconnect_work(struct work_struct *work)
{
	if (!cfg80211_is_all_idle())
		return;

	regulatory_hint_disconnect();
}

static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);

static int cfg80211_conn_scan(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	struct cfg80211_scan_request *request;
	int n_channels, err;

	ASSERT_RTNL();
	ASSERT_RDEV_LOCK(rdev);
	ASSERT_WDEV_LOCK(wdev);

	if (rdev->scan_req)
		return -EBUSY;

	if (wdev->conn->params.channel) {
		n_channels = 1;
	} else {
		enum ieee80211_band band;
		n_channels = 0;

		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
			if (!wdev->wiphy->bands[band])
				continue;
			n_channels += wdev->wiphy->bands[band]->n_channels;
		}
	}
	request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
			  sizeof(request->channels[0]) * n_channels,
			  GFP_KERNEL);
	if (!request)
		return -ENOMEM;

	if (wdev->conn->params.channel)
		request->channels[0] = wdev->conn->params.channel;
	else {
		int i = 0, j;
		enum ieee80211_band band;

		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
			if (!wdev->wiphy->bands[band])
				continue;
			for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
			     i++, j++)
				request->channels[i] =
					&wdev->wiphy->bands[band]->channels[j];
		}
	}
	request->n_channels = n_channels;
	request->ssids = (void *)&request->channels[n_channels];
	request->n_ssids = 1;

	memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
		wdev->conn->params.ssid_len);
	request->ssids[0].ssid_len = wdev->conn->params.ssid_len;

	request->dev = wdev->netdev;
	request->wiphy = &rdev->wiphy;

	rdev->scan_req = request;

	err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
	if (!err) {
		wdev->conn->state = CFG80211_CONN_SCANNING;
		nl80211_