mlme.c

WLAN无线网络管理的最新程序

	switch (wpa_s->mlme.state) {
	case IEEE80211_DISABLED:
		break;
	case IEEE80211_AUTHENTICATE:
		ieee80211_authenticate(wpa_s);
		break;
	case IEEE80211_ASSOCIATE:
		ieee80211_associate(wpa_s);
		break;
	case IEEE80211_ASSOCIATED:
		ieee80211_associated(wpa_s);
		break;
	case IEEE80211_IBSS_SEARCH:
		ieee80211_sta_find_ibss(wpa_s);
		break;
	case IEEE80211_IBSS_JOINED:
		ieee80211_sta_merge_ibss(wpa_s);
		break;
	default:
		wpa_printf(MSG_DEBUG, "ieee80211_sta_timer: Unknown state %d",
			   wpa_s->mlme.state);
		break;
	}

	if (ieee80211_privacy_mismatch(wpa_s)) {
		wpa_printf(MSG_DEBUG, "MLME: privacy configuration mismatch "
			   "and mixed-cell disabled - disassociate");

		ieee80211_send_disassoc(wpa_s, WLAN_REASON_UNSPECIFIED);
		ieee80211_set_associated(wpa_s, 0);
	}
}


static void ieee80211_sta_new_auth(struct wpa_supplicant *wpa_s)
{
	struct wpa_ssid *ssid = wpa_s->current_ssid;
	if (ssid && ssid->mode != 0)
		return;

#if 0 /* FIX */
	if (local->hw->reset_tsf) {
		/* Reset own TSF to allow time synchronization work. */
		local->hw->reset_tsf(local->mdev);
	}
#endif

	wpa_s->mlme.wmm_last_param_set = -1; /* allow any WMM update */


	if (wpa_s->mlme.auth_algs & IEEE80211_AUTH_ALG_OPEN)
		wpa_s->mlme.auth_alg = WLAN_AUTH_OPEN;
	else if (wpa_s->mlme.auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
		wpa_s->mlme.auth_alg = WLAN_AUTH_SHARED_KEY;
	else if (wpa_s->mlme.auth_algs & IEEE80211_AUTH_ALG_LEAP)
		wpa_s->mlme.auth_alg = WLAN_AUTH_LEAP;
	else
		wpa_s->mlme.auth_alg = WLAN_AUTH_OPEN;
	wpa_printf(MSG_DEBUG, "MLME: Initial auth_alg=%d",
		   wpa_s->mlme.auth_alg);
	wpa_s->mlme.auth_transaction = -1;
	wpa_s->mlme.auth_tries = wpa_s->mlme.assoc_tries = 0;
	ieee80211_authenticate(wpa_s);
}


static int ieee80211_ibss_allowed(struct wpa_supplicant *wpa_s)
{
#if 0 /* FIX */
	int m, c;

	for (m = 0; m < local->hw->num_modes; m++) {
		struct ieee80211_hw_modes *mode = &local->hw->modes[m];
		if (mode->mode != local->conf.phymode)
			continue;
		for (c = 0; c < mode->num_channels; c++) {
			struct ieee80211_channel *chan = &mode->channels[c];
			if (chan->flag & IEEE80211_CHAN_W_SCAN &&
			    chan->chan == local->conf.channel) {
				if (chan->flag & IEEE80211_CHAN_W_IBSS)
					return 1;
				break;
			}
		}
	}
#endif

	return 0;
}


static int ieee80211_sta_join_ibss(struct wpa_supplicant *wpa_s,
				   struct ieee80211_sta_bss *bss)
{
	int res = 0, rates, done = 0;
	struct ieee80211_mgmt *mgmt;
#if 0 /* FIX */
	struct ieee80211_tx_control control;
	struct ieee80211_rate *rate;
	struct rate_control_extra extra;
#endif
	u8 *pos, *buf;
	size_t len;

	/* Remove possible STA entries from other IBSS networks. */
#if 0 /* FIX */
	sta_info_flush(local, NULL);

	if (local->hw->reset_tsf) {
		/* Reset own TSF to allow time synchronization work. */
		local->hw->reset_tsf(local->mdev);
	}
#endif
	os_memcpy(wpa_s->bssid, bss->bssid, ETH_ALEN);

#if 0 /* FIX */
	local->conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;

	sdata->drop_unencrypted = bss->capability &
		host_to_le16(WLAN_CAPABILITY_PRIVACY) ? 1 : 0;
#endif

#if 0 /* FIX */
	os_memset(&rq, 0, sizeof(rq));
	rq.m = bss->freq * 100000;
	rq.e = 1;
	res = ieee80211_ioctl_siwfreq(wpa_s, NULL, &rq, NULL);
#endif

	if (!ieee80211_ibss_allowed(wpa_s)) {
#if 0 /* FIX */
		wpa_printf(MSG_DEBUG, "MLME: IBSS not allowed on channel %d "
			   "(%d MHz)", local->conf.channel,
			   local->conf.freq);
#endif
		return -1;
	}

	/* Set beacon template based on scan results */
	buf = os_malloc(400);
	len = 0;
	do {
		if (buf == NULL)
			break;

		mgmt = (struct ieee80211_mgmt *) buf;
		len += 24 + sizeof(mgmt->u.beacon);
		os_memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
		mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
						   WLAN_FC_STYPE_BEACON);
		os_memset(mgmt->da, 0xff, ETH_ALEN);
		os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
		os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
#if 0 /* FIX */
		mgmt->u.beacon.beacon_int =
			host_to_le16(local->conf.beacon_int);
#endif
		mgmt->u.beacon.capab_info = host_to_le16(bss->capability);

		pos = buf + len;
		len += 2 + wpa_s->mlme.ssid_len;
		*pos++ = WLAN_EID_SSID;
		*pos++ = wpa_s->mlme.ssid_len;
		os_memcpy(pos, wpa_s->mlme.ssid, wpa_s->mlme.ssid_len);

		rates = bss->supp_rates_len;
		if (rates > 8)
			rates = 8;
		pos = buf + len;
		len += 2 + rates;
		*pos++ = WLAN_EID_SUPP_RATES;
		*pos++ = rates;
		os_memcpy(pos, bss->supp_rates, rates);

		pos = buf + len;
		len += 2 + 1;
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = bss->channel;

		pos = buf + len;
		len += 2 + 2;
		*pos++ = WLAN_EID_IBSS_PARAMS;
		*pos++ = 2;
		/* FIX: set ATIM window based on scan results */
		*pos++ = 0;
		*pos++ = 0;

		if (bss->supp_rates_len > 8) {
			rates = bss->supp_rates_len - 8;
			pos = buf + len;
			len += 2 + rates;
			*pos++ = WLAN_EID_EXT_SUPP_RATES;
			*pos++ = rates;
			os_memcpy(pos, &bss->supp_rates[8], rates);
		}

#if 0 /* FIX */
		os_memset(&control, 0, sizeof(control));
		control.pkt_type = PKT_PROBE_RESP;
		os_memset(&extra, 0, sizeof(extra));
		extra.endidx = local->num_curr_rates;
		rate = rate_control_get_rate(wpa_s, skb, &extra);
		if (rate == NULL) {
			wpa_printf(MSG_DEBUG, "MLME: Failed to determine TX "
				   "rate for IBSS beacon");
			break;
		}
		control.tx_rate = (wpa_s->mlme.short_preamble &&
				   (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
			rate->val2 : rate->val;
		control.antenna_sel = local->conf.antenna_sel;
		control.power_level = local->conf.power_level;
		control.no_ack = 1;
		control.retry_limit = 1;
		control.rts_cts_duration = 0;
#endif

#if 0 /* FIX */
		wpa_s->mlme.probe_resp = skb_copy(skb, GFP_ATOMIC);
		if (wpa_s->mlme.probe_resp) {
			mgmt = (struct ieee80211_mgmt *)
				wpa_s->mlme.probe_resp->data;
			mgmt->frame_control =
				IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					     WLAN_FC_STYPE_PROBE_RESP);
		} else {
			wpa_printf(MSG_DEBUG, "MLME: Could not allocate "
				   "ProbeResp template for IBSS");
		}

		if (local->hw->beacon_update &&
		    local->hw->beacon_update(wpa_s, skb, &control) == 0) {
			wpa_printf(MSG_DEBUG, "MLME: Configured IBSS beacon "
				   "template based on scan results");
			skb = NULL;
		}

		rates = 0;
		for (i = 0; i < bss->supp_rates_len; i++) {
			int rate = (bss->supp_rates[i] & 0x7f) * 5;
			if (local->conf.phymode == MODE_ATHEROS_TURBO)
				rate *= 2;
			for (j = 0; j < local->num_curr_rates; j++)
				if (local->curr_rates[j].rate == rate)
					rates |= BIT(j);
		}
		wpa_s->mlme.supp_rates_bits = rates;
#endif
		done = 1;
	} while (0);

	os_free(buf);
	if (!done) {
		wpa_printf(MSG_DEBUG, "MLME: Failed to configure IBSS beacon "
			   "template");
	}

	wpa_s->mlme.state = IEEE80211_IBSS_JOINED;
	ieee80211_reschedule_timer(wpa_s, IEEE80211_IBSS_MERGE_INTERVAL);

	return res;
}


#if 0 /* FIX */
static int ieee80211_sta_create_ibss(struct wpa_supplicant *wpa_s)
{
	struct ieee80211_sta_bss *bss;
	u8 bssid[ETH_ALEN], *pos;
	int i;

#if 0
	/* Easier testing, use fixed BSSID. */
	os_memset(bssid, 0xfe, ETH_ALEN);
#else
	/* Generate random, not broadcast, locally administered BSSID. Mix in
	 * own MAC address to make sure that devices that do not have proper
	 * random number generator get different BSSID. */
	os_get_random(bssid, ETH_ALEN);
	for (i = 0; i < ETH_ALEN; i++)
		bssid[i] ^= wpa_s->own_addr[i];
	bssid[0] &= ~0x01;
	bssid[0] |= 0x02;
#endif

	wpa_printf(MSG_DEBUG, "MLME: Creating new IBSS network, BSSID "
		   MACSTR "", MAC2STR(bssid));

	bss = ieee80211_bss_add(wpa_s, bssid);
	if (bss == NULL)
		return -ENOMEM;

#if 0 /* FIX */
	if (local->conf.beacon_int == 0)
		local->conf.beacon_int = 100;
	bss->beacon_int = local->conf.beacon_int;
	bss->hw_mode = local->conf.phymode;
	bss->channel = local->conf.channel;
	bss->freq = local->conf.freq;
#endif
	os_get_time(&bss->last_update);
	bss->capability = host_to_le16(WLAN_CAPABILITY_IBSS);
#if 0 /* FIX */
	if (sdata->default_key) {
		bss->capability |= host_to_le16(WLAN_CAPABILITY_PRIVACY);
	} else
		sdata->drop_unencrypted = 0;
	bss->supp_rates_len = local->num_curr_rates;
#endif
	pos = bss->supp_rates;
#if 0 /* FIX */
	for (i = 0; i < local->num_curr_rates; i++) {
		int rate = local->curr_rates[i].rate;
		if (local->conf.phymode == MODE_ATHEROS_TURBO)
			rate /= 2;
		*pos++ = (u8) (rate / 5);
	}
#endif

	return ieee80211_sta_join_ibss(wpa_s, bss);
}
#endif


static int ieee80211_sta_find_ibss(struct wpa_supplicant *wpa_s)
{
	struct ieee80211_sta_bss *bss;
	int found = 0;
	u8 bssid[ETH_ALEN];
	int active_ibss;
	struct os_time now;

	if (wpa_s->mlme.ssid_len == 0)
		return -EINVAL;

	active_ibss = ieee80211_sta_active_ibss(wpa_s);
#ifdef IEEE80211_IBSS_DEBUG
	wpa_printf(MSG_DEBUG, "MLME: sta_find_ibss (active_ibss=%d)",
		   active_ibss);
#endif /* IEEE80211_IBSS_DEBUG */
	for (bss = wpa_s->mlme.sta_bss_list; bss; bss = bss->next) {
		if (wpa_s->mlme.ssid_len != bss->ssid_len ||
		    os_memcmp(wpa_s->mlme.ssid, bss->ssid, bss->ssid_len) != 0
		    || !(bss->capability & WLAN_CAPABILITY_IBSS))
			continue;
#ifdef IEEE80211_IBSS_DEBUG
		wpa_printf(MSG_DEBUG, "   bssid=" MACSTR " found",
			   MAC2STR(bss->bssid));
#endif /* IEEE80211_IBSS_DEBUG */
		os_memcpy(bssid, bss->bssid, ETH_ALEN);
		found = 1;
		if (active_ibss ||
		    os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)
			break;
	}

#ifdef IEEE80211_IBSS_DEBUG
	wpa_printf(MSG_DEBUG, "   sta_find_ibss: selected " MACSTR " current "
		   MACSTR, MAC2STR(bssid), MAC2STR(wpa_s->bssid));
#endif /* IEEE80211_IBSS_DEBUG */
	if (found && os_memcmp(wpa_s->bssid, bssid, ETH_ALEN) != 0 &&
	    (bss = ieee80211_bss_get(wpa_s, bssid))) {
		wpa_printf(MSG_DEBUG, "MLME: Selected IBSS BSSID " MACSTR
			   " based on configured SSID",
			   MAC2STR(bssid));
		return ieee80211_sta_join_ibss(wpa_s, bss);
	}
#ifdef IEEE80211_IBSS_DEBUG
	wpa_printf(MSG_DEBUG, "   did not try to join ibss");
#endif /* IEEE80211_IBSS_DEBUG */

	/* Selected IBSS not found in current scan results - try to scan */
	os_get_time(&now);
#if 0 /* FIX */
	if (wpa_s->mlme.state == IEEE80211_IBSS_JOINED &&
	    !ieee80211_sta_active_ibss(wpa_s)) {
		ieee80211_reschedule_timer(wpa_s,
					   IEEE80211_IBSS_MERGE_INTERVAL);
	} else if (time_after(jiffies, wpa_s->mlme.last_scan_completed +
			      IEEE80211_SCAN_INTERVAL)) {
		wpa_printf(MSG_DEBUG, "MLME: Trigger new scan to find an IBSS "
			   "to join");
		return ieee80211_sta_req_scan(wpa_s->mlme.ssid,
					      wpa_s->mlme.ssid_len);
	} else if (wpa_s->mlme.state != IEEE80211_IBSS_JOINED) {
		int interval = IEEE80211_SCAN_INTERVAL;

		if (time_after(jiffies, wpa_s->mlme.ibss_join_req +
			       IEEE80211_IBSS_JOIN_TIMEOUT)) {
			if (wpa_s->mlme.create_ibss &&
			    ieee80211_ibss_allowed(wpa_s))
				return ieee80211_sta_create_ibss(wpa_s);
			if (wpa_s->mlme.create_ibss) {
				wpa_printf(MSG_DEBUG, "MLME: IBSS not allowed "
					   "on the configured channel %d "
					   "(%d MHz)",
					   local->conf.channel,
					   local->conf.freq);
			}

			/* No IBSS found - decrease scan interval and continue
			 * scanning. */
			interval = IEEE80211_SCAN_INTERVAL_SLOW;
		}

		wpa_s->mlme.state = IEEE80211_IBSS_SEARCH;
		ieee80211_reschedule_timer(wpa_s, interval);
		return 0;
	}
#endif

	return 0;
}


int ieee80211_sta_get_ssid(struct wpa_supplicant *wpa_s, u8 *ssid,
			   size_t *len)
{
	os_memcpy(ssid, wpa_s->mlme.ssid, wpa_s->mlme.ssid_len);
	*len = wpa_s->mlme.ssid_len;
	return 0;
}


int ieee80211_sta_associate(struct wpa_supplicant *wpa_s,
			    struct wpa_driver_associate_params *params)
{
	struct ieee80211_sta_bss *bss;

	wpa_s->mlme.bssid_set = 0;
	wpa_s->mlme.freq = params->freq;
	if (params->bssid) {
		os_memcpy(wpa_s->bssid, params->bssid, ETH_ALEN);
		if (os_memcmp(params->bssid, "\x00\x00\x00\x00\x00\x00",
			      ETH_ALEN))
			wpa_s->mlme.bssid_set = 1;
		bss = ieee80211_bss_get(wpa_s, wpa_s->bssid);
		if (bss) {
			wpa_s->mlme.phymode = bss->hw_mode;
			wpa_s->mlme.channel = bss->channel;
			wpa_s->mlme.freq = bss->freq;
		}
	}

#if 0 /* FIX */
	/* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
	 * not defined. */
	if (local->hw->conf_tx) {
		struct ieee80211_tx_queue_params qparam;
		int i;

		os_memset(&qparam, 0, sizeof(qparam));
		/* TODO: are these ok defaults for all hw_modes? */
		qparam.aifs = 2;
		qparam.cw_min =
			local->conf.phymode == MODE_IEEE80211B ? 31 : 15;
		qparam.cw_max = 1023;
		qparam.burst_time = 0;
		for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
		{
			local->hw->conf_tx(wpa_s, i + IEEE80211_TX_QUEUE_DATA0,
					   &qparam);
		}
		/* IBSS uses different parameters for Beacon sending */
		qparam.cw_min++;
		qparam.cw_min *= 2;
		qparam.cw_min--;
		local->hw->conf_tx(wpa_s, IEEE80211_TX_QUEUE_BEACON, &qparam);
	}
#endif

	if (wpa_s->mlme.ssid_len != params->ssid_len ||
	    os_memcmp(wpa_s->mlme.ssid, params->ssid, params->ssid_len) != 0)
		wpa_s->mlme.prev_bssid_set = 0;
	os_memcpy(wpa_s->mlme.ssid, params->ssid, params->ssid_len);
	os_memset(wpa_s->mlme.ssid + params->ssid_len, 0,
		  MAX_SSID_LEN - params->ssid_len);
	wpa_s->mlme.ssid_len = params->ssid_len;
	wpa_s->mlme.ssid_set = 1;

	os_free(wpa_s->mlme.extra_ie);
	if (params->wpa_ie == NULL || params->wpa_ie_len == 0) {
		wpa_s->mlme.extra_ie = NULL;
		wpa_s->mlme.extra_ie_len = 0;
		return 0;
	}
	wpa_s->mlme.extra_ie = os_malloc(params->wpa_ie_len);
	if (wpa_s->mlme.extra_ie == NULL) {
		wpa_s->mlme.extra_ie_len = 0;
		return -1;
	}
	os_memcpy(wpa_s->mlme.extra_ie, params->wpa_ie, params->wpa_ie_len);
	wpa_s->mlme.extra_ie_len = params->wpa_ie_len;