[deliverable/linux.git] / drivers / net / wireless / hostap / hostap_info.c

/* Host AP driver Info Frame processing (part of hostap.o module) */

#include "hostap_wlan.h"
#include "hostap.h"
#include "hostap_ap.h"

/* Called only as a tasklet (software IRQ) */
static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
				      int left)
{
	struct hfa384x_comm_tallies *tallies;

	if (left < sizeof(struct hfa384x_comm_tallies)) {
		printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
		       "info frame\n", local->dev->name, left);
		return;
	}

	tallies = (struct hfa384x_comm_tallies *) buf;
#define ADD_COMM_TALLIES(name) \
local->comm_tallies.name += le16_to_cpu(tallies->name)
	ADD_COMM_TALLIES(tx_unicast_frames);
	ADD_COMM_TALLIES(tx_multicast_frames);
	ADD_COMM_TALLIES(tx_fragments);
	ADD_COMM_TALLIES(tx_unicast_octets);
	ADD_COMM_TALLIES(tx_multicast_octets);
	ADD_COMM_TALLIES(tx_deferred_transmissions);
	ADD_COMM_TALLIES(tx_single_retry_frames);
	ADD_COMM_TALLIES(tx_multiple_retry_frames);
	ADD_COMM_TALLIES(tx_retry_limit_exceeded);
	ADD_COMM_TALLIES(tx_discards);
	ADD_COMM_TALLIES(rx_unicast_frames);
	ADD_COMM_TALLIES(rx_multicast_frames);
	ADD_COMM_TALLIES(rx_fragments);
	ADD_COMM_TALLIES(rx_unicast_octets);
	ADD_COMM_TALLIES(rx_multicast_octets);
	ADD_COMM_TALLIES(rx_fcs_errors);
	ADD_COMM_TALLIES(rx_discards_no_buffer);
	ADD_COMM_TALLIES(tx_discards_wrong_sa);
	ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
	ADD_COMM_TALLIES(rx_message_in_msg_fragments);
	ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
#undef ADD_COMM_TALLIES
}


/* Called only as a tasklet (software IRQ) */
static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
				      int left)
{
	struct hfa384x_comm_tallies32 *tallies;

	if (left < sizeof(struct hfa384x_comm_tallies32)) {
		printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
		       "info frame\n", local->dev->name, left);
		return;
	}

	tallies = (struct hfa384x_comm_tallies32 *) buf;
#define ADD_COMM_TALLIES(name) \
local->comm_tallies.name += le32_to_cpu(tallies->name)
	ADD_COMM_TALLIES(tx_unicast_frames);
	ADD_COMM_TALLIES(tx_multicast_frames);
	ADD_COMM_TALLIES(tx_fragments);
	ADD_COMM_TALLIES(tx_unicast_octets);
	ADD_COMM_TALLIES(tx_multicast_octets);
	ADD_COMM_TALLIES(tx_deferred_transmissions);
	ADD_COMM_TALLIES(tx_single_retry_frames);
	ADD_COMM_TALLIES(tx_multiple_retry_frames);
	ADD_COMM_TALLIES(tx_retry_limit_exceeded);
	ADD_COMM_TALLIES(tx_discards);
	ADD_COMM_TALLIES(rx_unicast_frames);
	ADD_COMM_TALLIES(rx_multicast_frames);
	ADD_COMM_TALLIES(rx_fragments);
	ADD_COMM_TALLIES(rx_unicast_octets);
	ADD_COMM_TALLIES(rx_multicast_octets);
	ADD_COMM_TALLIES(rx_fcs_errors);
	ADD_COMM_TALLIES(rx_discards_no_buffer);
	ADD_COMM_TALLIES(tx_discards_wrong_sa);
	ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
	ADD_COMM_TALLIES(rx_message_in_msg_fragments);
	ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
#undef ADD_COMM_TALLIES
}


/* Called only as a tasklet (software IRQ) */
static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
				    int left)
{
	if (local->tallies32)
		prism2_info_commtallies32(local, buf, left);
	else
		prism2_info_commtallies16(local, buf, left);
}


#ifndef PRISM2_NO_STATION_MODES
#ifndef PRISM2_NO_DEBUG
static const char* hfa384x_linkstatus_str(u16 linkstatus)
{
	switch (linkstatus) {
	case HFA384X_LINKSTATUS_CONNECTED:
		return "Connected";
	case HFA384X_LINKSTATUS_DISCONNECTED:
		return "Disconnected";
	case HFA384X_LINKSTATUS_AP_CHANGE:
		return "Access point change";
	case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
		return "Access point out of range";
	case HFA384X_LINKSTATUS_AP_IN_RANGE:
		return "Access point in range";
	case HFA384X_LINKSTATUS_ASSOC_FAILED:
		return "Association failed";
	default:
		return "Unknown";
	}
}
#endif /* PRISM2_NO_DEBUG */


/* Called only as a tasklet (software IRQ) */
static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
				    int left)
{
	u16 val;
	int non_sta_mode;

	/* Alloc new JoinRequests to occur since LinkStatus for the previous
	 * has been received */
	local->last_join_time = 0;

	if (left != 2) {
		printk(KERN_DEBUG "%s: invalid linkstatus info frame "
		       "length %d\n", local->dev->name, left);
		return;
	}

	non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
		local->iw_mode == IW_MODE_REPEAT ||
		local->iw_mode == IW_MODE_MONITOR;

	val = buf[0] | (buf[1] << 8);
	if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
		PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
		       local->dev->name, val, hfa384x_linkstatus_str(val));
	}

	if (non_sta_mode) {
		netif_carrier_on(local->dev);
		netif_carrier_on(local->ddev);
		return;
	}

	/* Get current BSSID later in scheduled task */
	set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
	local->prev_link_status = val;
	schedule_work(&local->info_queue);
}


static void prism2_host_roaming(local_info_t *local)
{
	struct hfa384x_join_request req;
	struct net_device *dev = local->dev;
	struct hfa384x_hostscan_result *selected, *entry;
	int i;
	unsigned long flags;

	if (local->last_join_time &&
	    time_before(jiffies, local->last_join_time + 10 * HZ)) {
		PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
		       "completed - waiting for it before issuing new one\n",
		       dev->name);
		return;
	}

	/* ScanResults are sorted: first ESS results in decreasing signal
	 * quality then IBSS results in similar order.
	 * Trivial roaming policy: just select the first entry.
	 * This could probably be improved by adding hysteresis to limit
	 * number of handoffs, etc.
	 *
	 * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
	 * ScanResults */
	spin_lock_irqsave(&local->lock, flags);
	if (local->last_scan_results == NULL ||
	    local->last_scan_results_count == 0) {
		spin_unlock_irqrestore(&local->lock, flags);
		PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
		       dev->name);
		return;
	}

	selected = &local->last_scan_results[0];

	if (local->preferred_ap[0] || local->preferred_ap[1] ||
	    local->preferred_ap[2] || local->preferred_ap[3] ||
	    local->preferred_ap[4] || local->preferred_ap[5]) {
		/* Try to find preferred AP */
		PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
		       dev->name, local->preferred_ap);
		for (i = 0; i < local->last_scan_results_count; i++) {
			entry = &local->last_scan_results[i];
			if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
			{
				PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
				       "selection\n", dev->name);
				selected = entry;
				break;
			}
		}
	}

	memcpy(req.bssid, selected->bssid, 6);
	req.channel = selected->chid;
	spin_unlock_irqrestore(&local->lock, flags);

	PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%pM"
	       " channel=%d\n",
	       dev->name, req.bssid, le16_to_cpu(req.channel));
	if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
				 sizeof(req))) {
		printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
	}
	local->last_join_time = jiffies;
}


static void hostap_report_scan_complete(local_info_t *local)
{
	union iwreq_data wrqu;

	/* Inform user space about new scan results (just empty event,
	 * SIOCGIWSCAN can be used to fetch data */
	wrqu.data.length = 0;
	wrqu.data.flags = 0;
	wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);

	/* Allow SIOCGIWSCAN handling to occur since we have received
	 * scanning result */
	local->scan_timestamp = 0;
}


/* Called only as a tasklet (software IRQ) */
static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
				    int left)
{
	u16 *pos;
	int new_count, i;
	unsigned long flags;
	struct hfa384x_scan_result *res;
	struct hfa384x_hostscan_result *results, *prev;

	if (left < 4) {
		printk(KERN_DEBUG "%s: invalid scanresult info frame "
		       "length %d\n", local->dev->name, left);
		return;
	}

	pos = (u16 *) buf;
	pos++;
	pos++;
	left -= 4;

	new_count = left / sizeof(struct hfa384x_scan_result);
	results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
			  GFP_ATOMIC);
	if (results == NULL)
		return;

	/* Convert to hostscan result format. */
	res = (struct hfa384x_scan_result *) pos;
	for (i = 0; i < new_count; i++) {
		memcpy(&results[i], &res[i],
		       sizeof(struct hfa384x_scan_result));
		results[i].atim = 0;
	}

	spin_lock_irqsave(&local->lock, flags);
	local->last_scan_type = PRISM2_SCAN;
	prev = local->last_scan_results;
	local->last_scan_results = results;
	local->last_scan_results_count = new_count;
	spin_unlock_irqrestore(&local->lock, flags);
	kfree(prev);

	hostap_report_scan_complete(local);

	/* Perform rest of ScanResults handling later in scheduled task */
	set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
	schedule_work(&local->info_queue);
}


/* Called only as a tasklet (software IRQ) */
static void prism2_info_hostscanresults(local_info_t *local,
					unsigned char *buf, int left)
{
	int i, result_size, copy_len, new_count;
	struct hfa384x_hostscan_result *results, *prev;
	unsigned long flags;
	__le16 *pos;
	u8 *ptr;

	wake_up_interruptible(&local->hostscan_wq);

	if (left < 4) {
		printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
		       "length %d\n", local->dev->name, left);
		return;
	}

	pos = (__le16 *) buf;
	copy_len = result_size = le16_to_cpu(*pos);
	if (result_size == 0) {
		printk(KERN_DEBUG "%s: invalid result_size (0) in "
		       "hostscanresults\n", local->dev->name);
		return;
	}
	if (copy_len > sizeof(struct hfa384x_hostscan_result))
		copy_len = sizeof(struct hfa384x_hostscan_result);

	pos++;
	pos++;
	left -= 4;
	ptr = (u8 *) pos;

	new_count = left / result_size;
	results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
			  GFP_ATOMIC);
	if (results == NULL)
		return;

	for (i = 0; i < new_count; i++) {
		memcpy(&results[i], ptr, copy_len);
		ptr += result_size;
		left -= result_size;
	}

	if (left) {
		printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
		       local->dev->name, left, result_size);
	}

	spin_lock_irqsave(&local->lock, flags);
	local->last_scan_type = PRISM2_HOSTSCAN;
	prev = local->last_scan_results;
	local->last_scan_results = results;
	local->last_scan_results_count = new_count;
	spin_unlock_irqrestore(&local->lock, flags);
	kfree(prev);

	hostap_report_scan_complete(local);
}
#endif /* PRISM2_NO_STATION_MODES */


/* Called only as a tasklet (software IRQ) */
void hostap_info_process(local_info_t *local, struct sk_buff *skb)
{
	struct hfa384x_info_frame *info;
	unsigned char *buf;
	int left;
#ifndef PRISM2_NO_DEBUG
	int i;
#endif /* PRISM2_NO_DEBUG */

	info = (struct hfa384x_info_frame *) skb->data;
	buf = skb->data + sizeof(*info);
	left = skb->len - sizeof(*info);

	switch (le16_to_cpu(info->type)) {
	case HFA384X_INFO_COMMTALLIES:
		prism2_info_commtallies(local, buf, left);
		break;

#ifndef PRISM2_NO_STATION_MODES
	case HFA384X_INFO_LINKSTATUS:
		prism2_info_linkstatus(local, buf, left);
		break;

	case HFA384X_INFO_SCANRESULTS:
		prism2_info_scanresults(local, buf, left);
		break;

	case HFA384X_INFO_HOSTSCANRESULTS:
		prism2_info_hostscanresults(local, buf, left);
		break;
#endif /* PRISM2_NO_STATION_MODES */

#ifndef PRISM2_NO_DEBUG
	default:
		PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
		       local->dev->name, le16_to_cpu(info->len),
		       le16_to_cpu(info->type));
		PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
		for (i = 0; i < (left < 100 ? left : 100); i++)
			PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
		PDEBUG2(DEBUG_EXTRA, "\n");
		break;
#endif /* PRISM2_NO_DEBUG */
	}
}


#ifndef PRISM2_NO_STATION_MODES
static void handle_info_queue_linkstatus(local_info_t *local)
{
	int val = local->prev_link_status;
	int connected;
	union iwreq_data wrqu;

	connected =
		val == HFA384X_LINKSTATUS_CONNECTED ||
		val == HFA384X_LINKSTATUS_AP_CHANGE ||
		val == HFA384X_LINKSTATUS_AP_IN_RANGE;

	if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
				 local->bssid, ETH_ALEN, 1) < 0) {
		printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
		       "LinkStatus event\n", local->dev->name);
	} else {
		PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=%pM\n",
		       local->dev->name,
		       (unsigned char *) local->bssid);
		if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
			hostap_add_sta(local->ap, local->bssid);
	}

	/* Get BSSID if we have a valid AP address */
	if (connected) {
		netif_carrier_on(local->dev);
		netif_carrier_on(local->ddev);
		memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
	} else {
		netif_carrier_off(local->dev);
		netif_carrier_off(local->ddev);
		memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
	}
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;

	/*
	 * Filter out sequential disconnect events in order not to cause a
	 * flood of SIOCGIWAP events that have a race condition with EAPOL
	 * frames and can confuse wpa_supplicant about the current association
	 * status.
	 */
	if (connected || local->prev_linkstatus_connected)
		wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
	local->prev_linkstatus_connected = connected;
}


static void handle_info_queue_scanresults(local_info_t *local)
{
	if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
		prism2_host_roaming(local);

	if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
	    memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
		   ETH_ALEN) != 0) {
		/*
		 * Firmware seems to be getting into odd state in host_roaming
		 * mode 2 when hostscan is used without join command, so try
		 * to fix this by re-joining the current AP. This does not
		 * actually trigger a new association if the current AP is
		 * still in the scan results.
		 */
		prism2_host_roaming(local);
	}
}


/* Called only as scheduled task after receiving info frames (used to avoid
 * pending too much time in HW IRQ handler). */
static void handle_info_queue(struct work_struct *work)
{
	local_info_t *local = container_of(work, local_info_t, info_queue);

	if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
			       &local->pending_info))
		handle_info_queue_linkstatus(local);

	if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
			       &local->pending_info))
		handle_info_queue_scanresults(local);
}
#endif /* PRISM2_NO_STATION_MODES */


void hostap_info_init(local_info_t *local)
{
	skb_queue_head_init(&local->info_list);
#ifndef PRISM2_NO_STATION_MODES
	INIT_WORK(&local->info_queue, handle_info_queue);
#endif /* PRISM2_NO_STATION_MODES */
}


EXPORT_SYMBOL(hostap_info_init);
EXPORT_SYMBOL(hostap_info_process);
Commit	Line	Data
ff1d2767 JM	1	/* Host AP driver Info Frame processing (part of hostap.o module) */
ff1d2767 JM	2
5fad5a2e AB	3	#include "hostap_wlan.h"
	4	#include "hostap.h"
	5	#include "hostap_ap.h"
ff1d2767 JM	6
	7	/* Called only as a tasklet (software IRQ) */
	8	static void prism2_info_commtallies16(local_info_t local, unsigned char buf,
	9	int left)
	10	{
	11	struct hfa384x_comm_tallies *tallies;
	12
	13	if (left < sizeof(struct hfa384x_comm_tallies)) {
	14	printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
	15	"info frame\n", local->dev->name, left);
	16	return;
	17	}
	18
	19	tallies = (struct hfa384x_comm_tallies *) buf;
	20	#define ADD_COMM_TALLIES(name) \
	21	local->comm_tallies.name += le16_to_cpu(tallies->name)
	22	ADD_COMM_TALLIES(tx_unicast_frames);
	23	ADD_COMM_TALLIES(tx_multicast_frames);
	24	ADD_COMM_TALLIES(tx_fragments);
	25	ADD_COMM_TALLIES(tx_unicast_octets);
	26	ADD_COMM_TALLIES(tx_multicast_octets);
	27	ADD_COMM_TALLIES(tx_deferred_transmissions);
	28	ADD_COMM_TALLIES(tx_single_retry_frames);
	29	ADD_COMM_TALLIES(tx_multiple_retry_frames);
	30	ADD_COMM_TALLIES(tx_retry_limit_exceeded);
	31	ADD_COMM_TALLIES(tx_discards);
	32	ADD_COMM_TALLIES(rx_unicast_frames);
	33	ADD_COMM_TALLIES(rx_multicast_frames);
	34	ADD_COMM_TALLIES(rx_fragments);
	35	ADD_COMM_TALLIES(rx_unicast_octets);
	36	ADD_COMM_TALLIES(rx_multicast_octets);
	37	ADD_COMM_TALLIES(rx_fcs_errors);
	38	ADD_COMM_TALLIES(rx_discards_no_buffer);
	39	ADD_COMM_TALLIES(tx_discards_wrong_sa);
	40	ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
	41	ADD_COMM_TALLIES(rx_message_in_msg_fragments);
	42	ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
	43	#undef ADD_COMM_TALLIES
	44	}
	45
	46
	47	/* Called only as a tasklet (software IRQ) */
	48	static void prism2_info_commtallies32(local_info_t local, unsigned char buf,
	49	int left)
	50	{
	51	struct hfa384x_comm_tallies32 *tallies;
	52
	53	if (left < sizeof(struct hfa384x_comm_tallies32)) {
	54	printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
	55	"info frame\n", local->dev->name, left);
	56	return;
	57	}
	58
	59	tallies = (struct hfa384x_comm_tallies32 *) buf;
	60	#define ADD_COMM_TALLIES(name) \
	61	local->comm_tallies.name += le32_to_cpu(tallies->name)
	62	ADD_COMM_TALLIES(tx_unicast_frames);
	63	ADD_COMM_TALLIES(tx_multicast_frames);
	64	ADD_COMM_TALLIES(tx_fragments);
	65	ADD_COMM_TALLIES(tx_unicast_octets);
	66	ADD_COMM_TALLIES(tx_multicast_octets);
	67	ADD_COMM_TALLIES(tx_deferred_transmissions);
	68	ADD_COMM_TALLIES(tx_single_retry_frames);
	69	ADD_COMM_TALLIES(tx_multiple_retry_frames);
70	ADD_COMM_TALLIES(tx_retry_limit_exceeded);
71	ADD_COMM_TALLIES(tx_discards);
72	ADD_COMM_TALLIES(rx_unicast_frames);
73	ADD_COMM_TALLIES(rx_multicast_frames);
74	ADD_COMM_TALLIES(rx_fragments);
75	ADD_COMM_TALLIES(rx_unicast_octets);
76	ADD_COMM_TALLIES(rx_multicast_octets);
77	ADD_COMM_TALLIES(rx_fcs_errors);
78	ADD_COMM_TALLIES(rx_discards_no_buffer);
79	ADD_COMM_TALLIES(tx_discards_wrong_sa);
80	ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
81	ADD_COMM_TALLIES(rx_message_in_msg_fragments);
82	ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
83	#undef ADD_COMM_TALLIES
84	}
85
86
87	/* Called only as a tasklet (software IRQ) */
88	static void prism2_info_commtallies(local_info_t local, unsigned char buf,
89	int left)
90	{
91	if (local->tallies32)
92	prism2_info_commtallies32(local, buf, left);
93	else
94	prism2_info_commtallies16(local, buf, left);
95	}
96
97
98	#ifndef PRISM2_NO_STATION_MODES
99	#ifndef PRISM2_NO_DEBUG
100	static const char* hfa384x_linkstatus_str(u16 linkstatus)
101	{
102	switch (linkstatus) {
103	case HFA384X_LINKSTATUS_CONNECTED:
104	return "Connected";
105	case HFA384X_LINKSTATUS_DISCONNECTED:
106	return "Disconnected";
107	case HFA384X_LINKSTATUS_AP_CHANGE:
108	return "Access point change";
109	case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
110	return "Access point out of range";
111	case HFA384X_LINKSTATUS_AP_IN_RANGE:
112	return "Access point in range";
113	case HFA384X_LINKSTATUS_ASSOC_FAILED:
114	return "Association failed";
115	default:
116	return "Unknown";
117	}
118	}
119	#endif /* PRISM2_NO_DEBUG */
120
121
122	/* Called only as a tasklet (software IRQ) */
123	static void prism2_info_linkstatus(local_info_t local, unsigned char buf,
124	int left)
125	{
126	u16 val;
127	int non_sta_mode;
128
129	/* Alloc new JoinRequests to occur since LinkStatus for the previous
130	* has been received */
131	local->last_join_time = 0;
132
133	if (left != 2) {
134	printk(KERN_DEBUG "%s: invalid linkstatus info frame "
135	"length %d\n", local->dev->name, left);
136	return;
137	}
138
139	non_sta_mode = local->iw_mode == IW_MODE_MASTER \|\|
140	local->iw_mode == IW_MODE_REPEAT \|\|
141	local->iw_mode == IW_MODE_MONITOR;
142
143	val = buf[0] \| (buf[1] << 8);
144	if (!non_sta_mode \|\| val != HFA384X_LINKSTATUS_DISCONNECTED) {
145	PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
146	local->dev->name, val, hfa384x_linkstatus_str(val));
147	}
148
149	if (non_sta_mode) {
150	netif_carrier_on(local->dev);
151	netif_carrier_on(local->ddev);
152	return;
153	}
154
155	/* Get current BSSID later in scheduled task */
156	set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
157	local->prev_link_status = val;
158	schedule_work(&local->info_queue);
159	}
160
161
162	static void prism2_host_roaming(local_info_t *local)
163	{
164	struct hfa384x_join_request req;
165	struct net_device *dev = local->dev;
2e4fd068	166	struct hfa384x_hostscan_result selected, entry;
ff1d2767 JM	167	int i;
	168	unsigned long flags;
	169
	170	if (local->last_join_time &&
	171	time_before(jiffies, local->last_join_time + 10 * HZ)) {
	172	PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
	173	"completed - waiting for it before issuing new one\n",
	174	dev->name);
	175	return;
	176	}
	177
	178	/* ScanResults are sorted: first ESS results in decreasing signal
	179	* quality then IBSS results in similar order.
	180	* Trivial roaming policy: just select the first entry.
	181	* This could probably be improved by adding hysteresis to limit
	182	* number of handoffs, etc.
	183	*
	184	* Could do periodic RID_SCANREQUEST or Inquire F101 to get new
	185	* ScanResults */
	186	spin_lock_irqsave(&local->lock, flags);
	187	if (local->last_scan_results == NULL \|\|
	188	local->last_scan_results_count == 0) {
	189	spin_unlock_irqrestore(&local->lock, flags);
	190	PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
	191	dev->name);
	192	return;
	193	}
	194
	195	selected = &local->last_scan_results[0];
	196
	197	if (local->preferred_ap[0] \|\| local->preferred_ap[1] \|\|
	198	local->preferred_ap[2] \|\| local->preferred_ap[3] \|\|
	199	local->preferred_ap[4] \|\| local->preferred_ap[5]) {
	200	/* Try to find preferred AP */
e174961c JB	201	PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
e174961c JB	202	dev->name, local->preferred_ap);
ff1d2767 JM	203	for (i = 0; i < local->last_scan_results_count; i++) {
	204	entry = &local->last_scan_results[i];
	205	if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
	206	{
	207	PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
	208	"selection\n", dev->name);
	209	selected = entry;
	210	break;
	211	}
	212	}
	213	}
	214
	215	memcpy(req.bssid, selected->bssid, 6);
	216	req.channel = selected->chid;
	217	spin_unlock_irqrestore(&local->lock, flags);
	218
e174961c	219	PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%pM"
0795af57	220	" channel=%d\n",
e174961c	221	dev->name, req.bssid, le16_to_cpu(req.channel));
ff1d2767 JM	222	if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
	223	sizeof(req))) {
	224	printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
	225	}
	226	local->last_join_time = jiffies;
	227	}
	228
	229
	230	static void hostap_report_scan_complete(local_info_t *local)
	231	{
	232	union iwreq_data wrqu;
	233
	234	/* Inform user space about new scan results (just empty event,
	235	* SIOCGIWSCAN can be used to fetch data */
	236	wrqu.data.length = 0;
	237	wrqu.data.flags = 0;
	238	wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
	239
	240	/* Allow SIOCGIWSCAN handling to occur since we have received
	241	* scanning result */
	242	local->scan_timestamp = 0;
	243	}
	244
	245
	246	/* Called only as a tasklet (software IRQ) */
	247	static void prism2_info_scanresults(local_info_t local, unsigned char buf,
	248	int left)
	249	{
	250	u16 *pos;
2e4fd068	251	int new_count, i;
ff1d2767	252	unsigned long flags;
2e4fd068 JM	253	struct hfa384x_scan_result *res;
2e4fd068 JM	254	struct hfa384x_hostscan_result results, prev;
ff1d2767 JM	255
	256	if (left < 4) {
	257	printk(KERN_DEBUG "%s: invalid scanresult info frame "
	258	"length %d\n", local->dev->name, left);
	259	return;
	260	}
	261
	262	pos = (u16 *) buf;
	263	pos++;
	264	pos++;
	265	left -= 4;
	266
	267	new_count = left / sizeof(struct hfa384x_scan_result);
2e4fd068	268	results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
ff1d2767 JM	269	GFP_ATOMIC);
	270	if (results == NULL)
	271	return;
2e4fd068 JM	272
	273	/* Convert to hostscan result format. */
	274	res = (struct hfa384x_scan_result *) pos;
	275	for (i = 0; i < new_count; i++) {
	276	memcpy(&results[i], &res[i],
	277	sizeof(struct hfa384x_scan_result));
	278	results[i].atim = 0;
	279	}
ff1d2767 JM	280
	281	spin_lock_irqsave(&local->lock, flags);
	282	local->last_scan_type = PRISM2_SCAN;
	283	prev = local->last_scan_results;
	284	local->last_scan_results = results;
	285	local->last_scan_results_count = new_count;
	286	spin_unlock_irqrestore(&local->lock, flags);
	287	kfree(prev);
	288
	289	hostap_report_scan_complete(local);
	290
	291	/* Perform rest of ScanResults handling later in scheduled task */
	292	set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
	293	schedule_work(&local->info_queue);
	294	}
	295
	296
	297	/* Called only as a tasklet (software IRQ) */
	298	static void prism2_info_hostscanresults(local_info_t *local,
	299	unsigned char *buf, int left)
	300	{
	301	int i, result_size, copy_len, new_count;
	302	struct hfa384x_hostscan_result results, prev;
	303	unsigned long flags;
8a9faf3c	304	__le16 *pos;
ff1d2767 JM	305	u8 *ptr;
	306
	307	wake_up_interruptible(&local->hostscan_wq);
	308
	309	if (left < 4) {
	310	printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
	311	"length %d\n", local->dev->name, left);
	312	return;
	313	}
	314
8a9faf3c	315	pos = (__le16 *) buf;
ff1d2767 JM	316	copy_len = result_size = le16_to_cpu(*pos);
	317	if (result_size == 0) {
	318	printk(KERN_DEBUG "%s: invalid result_size (0) in "
	319	"hostscanresults\n", local->dev->name);
	320	return;
	321	}
	322	if (copy_len > sizeof(struct hfa384x_hostscan_result))
	323	copy_len = sizeof(struct hfa384x_hostscan_result);
	324
	325	pos++;
	326	pos++;
	327	left -= 4;
	328	ptr = (u8 *) pos;
	329
	330	new_count = left / result_size;
b0471bb7	331	results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
ff1d2767 JM	332	GFP_ATOMIC);
	333	if (results == NULL)
	334	return;
ff1d2767 JM	335
	336	for (i = 0; i < new_count; i++) {
	337	memcpy(&results[i], ptr, copy_len);
	338	ptr += result_size;
	339	left -= result_size;
	340	}
	341
	342	if (left) {
	343	printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
	344	local->dev->name, left, result_size);
	345	}
	346
	347	spin_lock_irqsave(&local->lock, flags);
	348	local->last_scan_type = PRISM2_HOSTSCAN;
2e4fd068 JM	349	prev = local->last_scan_results;
	350	local->last_scan_results = results;
	351	local->last_scan_results_count = new_count;
ff1d2767 JM	352	spin_unlock_irqrestore(&local->lock, flags);
	353	kfree(prev);
	354
	355	hostap_report_scan_complete(local);
	356	}
	357	#endif /* PRISM2_NO_STATION_MODES */
	358
	359
	360	/* Called only as a tasklet (software IRQ) */
	361	void hostap_info_process(local_info_t local, struct sk_buff skb)
	362	{
	363	struct hfa384x_info_frame *info;
	364	unsigned char *buf;
	365	int left;
	366	#ifndef PRISM2_NO_DEBUG
	367	int i;
	368	#endif /* PRISM2_NO_DEBUG */
	369
	370	info = (struct hfa384x_info_frame *) skb->data;
	371	buf = skb->data + sizeof(*info);
	372	left = skb->len - sizeof(*info);
	373
184a3b2c	374	switch (le16_to_cpu(info->type)) {
ff1d2767 JM	375	case HFA384X_INFO_COMMTALLIES:
	376	prism2_info_commtallies(local, buf, left);
	377	break;
	378
	379	#ifndef PRISM2_NO_STATION_MODES
	380	case HFA384X_INFO_LINKSTATUS:
	381	prism2_info_linkstatus(local, buf, left);
	382	break;
	383
	384	case HFA384X_INFO_SCANRESULTS:
	385	prism2_info_scanresults(local, buf, left);
	386	break;
	387
	388	case HFA384X_INFO_HOSTSCANRESULTS:
	389	prism2_info_hostscanresults(local, buf, left);
	390	break;
	391	#endif /* PRISM2_NO_STATION_MODES */
	392
	393	#ifndef PRISM2_NO_DEBUG
	394	default:
	395	PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
184a3b2c AV	396	local->dev->name, le16_to_cpu(info->len),
184a3b2c AV	397	le16_to_cpu(info->type));
ff1d2767 JM	398	PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
	399	for (i = 0; i < (left < 100 ? left : 100); i++)
	400	PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
	401	PDEBUG2(DEBUG_EXTRA, "\n");
	402	break;
	403	#endif /* PRISM2_NO_DEBUG */
	404	}
	405	}
	406
	407
	408	#ifndef PRISM2_NO_STATION_MODES
	409	static void handle_info_queue_linkstatus(local_info_t *local)
	410	{
	411	int val = local->prev_link_status;
	412	int connected;
	413	union iwreq_data wrqu;
	414
	415	connected =
	416	val == HFA384X_LINKSTATUS_CONNECTED \|\|
	417	val == HFA384X_LINKSTATUS_AP_CHANGE \|\|
	418	val == HFA384X_LINKSTATUS_AP_IN_RANGE;
	419
	420	if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
	421	local->bssid, ETH_ALEN, 1) < 0) {
	422	printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
	423	"LinkStatus event\n", local->dev->name);
	424	} else {
e174961c	425	PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=%pM\n",
ff1d2767	426	local->dev->name,
e174961c	427	(unsigned char *) local->bssid);
ff1d2767 JM	428	if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
	429	hostap_add_sta(local->ap, local->bssid);
	430	}
	431
	432	/* Get BSSID if we have a valid AP address */
	433	if (connected) {
	434	netif_carrier_on(local->dev);
	435	netif_carrier_on(local->ddev);
	436	memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
	437	} else {
	438	netif_carrier_off(local->dev);
	439	netif_carrier_off(local->ddev);
	440	memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
	441	}
	442	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	443
	444	/*
	445	* Filter out sequential disconnect events in order not to cause a
	446	* flood of SIOCGIWAP events that have a race condition with EAPOL
	447	* frames and can confuse wpa_supplicant about the current association
	448	* status.
	449	*/
	450	if (connected \|\| local->prev_linkstatus_connected)
	451	wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
	452	local->prev_linkstatus_connected = connected;
	453	}
	454
	455
	456	static void handle_info_queue_scanresults(local_info_t *local)
	457	{
	458	if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
	459	prism2_host_roaming(local);
0c629a69 JM	460
	461	if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
	462	memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
	463	ETH_ALEN) != 0) {
	464	/*
	465	* Firmware seems to be getting into odd state in host_roaming
	466	* mode 2 when hostscan is used without join command, so try
	467	* to fix this by re-joining the current AP. This does not
	468	* actually trigger a new association if the current AP is
	469	* still in the scan results.
	470	*/
	471	prism2_host_roaming(local);
	472	}
ff1d2767 JM	473	}
	474
	475
	476	/* Called only as scheduled task after receiving info frames (used to avoid
	477	* pending too much time in HW IRQ handler). */
c4028958	478	static void handle_info_queue(struct work_struct *work)
ff1d2767	479	{
c4028958	480	local_info_t *local = container_of(work, local_info_t, info_queue);
ff1d2767 JM	481
	482	if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
	483	&local->pending_info))
	484	handle_info_queue_linkstatus(local);
	485
	486	if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
	487	&local->pending_info))
	488	handle_info_queue_scanresults(local);
	489	}
	490	#endif /* PRISM2_NO_STATION_MODES */
	491
	492
	493	void hostap_info_init(local_info_t *local)
	494	{
	495	skb_queue_head_init(&local->info_list);
	496	#ifndef PRISM2_NO_STATION_MODES
c4028958	497	INIT_WORK(&local->info_queue, handle_info_queue);
ff1d2767 JM	498	#endif /* PRISM2_NO_STATION_MODES */
	499	}
	500
	501
	502	EXPORT_SYMBOL(hostap_info_init);
	503	EXPORT_SYMBOL(hostap_info_process);