Add HostAP wireless driver.

Includes minor cleanups from Adrian Bunk <bunk@stusta.de>.

1 files changed, 478 insertions, 0 deletions

diff --git a/drivers/net/wireless/hostap/hostap_info.c b/drivers/net/wireless/hostap/hostap_info.c
new file mode 100644
index 0000000..cf9e089
--- /dev/null
+++ b/drivers/net/wireless/hostap/hostap_info.c
@@ -0,0 +1,478 @@
+/* Host AP driver Info Frame processing (part of hostap.o module) */
+
+
+/* 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_scan_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 " MACSTR "\n",
+		       dev->name, MAC2STR(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=" MACSTR " channel=%d\n",
+	       dev->name, MAC2STR(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;
+	unsigned long flags;
+	struct hfa384x_scan_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_scan_result),
+			  GFP_ATOMIC);
+	if (results == NULL)
+		return;
+	memcpy(results, pos, new_count * sizeof(struct hfa384x_scan_result));
+
+	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;
+	u16 *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 = (u16 *) 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 = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
+			  GFP_ATOMIC);
+	if (results == NULL)
+		return;
+	memset(results, 0, new_count * sizeof(struct hfa384x_hostscan_result));
+
+	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_hostscan_results;
+	local->last_hostscan_results = results;
+	local->last_hostscan_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 (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, info->len, 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=" MACSTR "\n",
+		       local->dev->name,
+		       MAC2STR((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);
+}
+
+
+/* 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(void *data)
+{
+	local_info_t *local = (local_info_t *) data;
+
+	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, local);
+#endif /* PRISM2_NO_STATION_MODES */
+}
+
+
+EXPORT_SYMBOL(hostap_info_init);
+EXPORT_SYMBOL(hostap_info_process);