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@@ -0,0 +1,896 @@
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+/******************************************************************************
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+ *
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+ * GPL LICENSE SUMMARY
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+ *
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+ * Copyright(c) 2008 Intel Corporation. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of version 2 of the GNU General Public License as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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+ * USA
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+ *
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+ * The full GNU General Public License is included in this distribution
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+ * in the file called LICENSE.GPL.
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+ *
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+ * Contact Information:
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+ * Tomas Winkler <tomas.winkler@intel.com>
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+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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+ *****************************************************************************/
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+#include <net/mac80211.h>
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+#include <linux/etherdevice.h>
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+
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+#include "iwl-eeprom.h"
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+#include "iwl-dev.h"
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+#include "iwl-core.h"
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+#include "iwl-sta.h"
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+#include "iwl-io.h"
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+#include "iwl-helpers.h"
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+
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+/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
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+ * sending probe req. This should be set long enough to hear probe responses
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+ * from more than one AP. */
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+#define IWL_ACTIVE_DWELL_TIME_24 (20) /* all times in msec */
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+#define IWL_ACTIVE_DWELL_TIME_52 (10)
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+
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+/* For faster active scanning, scan will move to the next channel if fewer than
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+ * PLCP_QUIET_THRESH packets are heard on this channel within
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+ * ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell
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+ * time if it's a quiet channel (nothing responded to our probe, and there's
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+ * no other traffic).
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+ * Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
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+#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
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+#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(5) /* msec */
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+
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+/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
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+ * Must be set longer than active dwell time.
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+ * For the most reliable scan, set > AP beacon interval (typically 100msec). */
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+#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
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+#define IWL_PASSIVE_DWELL_TIME_52 (10)
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+#define IWL_PASSIVE_DWELL_BASE (100)
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+#define IWL_CHANNEL_TUNE_TIME 5
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+
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+
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+
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+static int iwl_is_empty_essid(const char *essid, int essid_len)
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+{
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+ /* Single white space is for Linksys APs */
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+ if (essid_len == 1 && essid[0] == ' ')
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+ return 1;
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+
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+ /* Otherwise, if the entire essid is 0, we assume it is hidden */
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+ while (essid_len) {
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+ essid_len--;
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+ if (essid[essid_len] != '\0')
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+ return 0;
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+ }
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+
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+ return 1;
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+}
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+
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+
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+
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+const char *iwl_escape_essid(const char *essid, u8 essid_len)
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+{
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+ static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
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+ const char *s = essid;
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+ char *d = escaped;
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+
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+ if (iwl_is_empty_essid(essid, essid_len)) {
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+ memcpy(escaped, "<hidden>", sizeof("<hidden>"));
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+ return escaped;
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+ }
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+
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+ essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
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+ while (essid_len--) {
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+ if (*s == '\0') {
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+ *d++ = '\\';
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+ *d++ = '0';
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+ s++;
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+ } else
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+ *d++ = *s++;
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+ }
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+ *d = '\0';
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+ return escaped;
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+}
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+EXPORT_SYMBOL(iwl_escape_essid);
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+
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+/**
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+ * iwl_scan_cancel - Cancel any currently executing HW scan
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+ *
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+ * NOTE: priv->mutex is not required before calling this function
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+ */
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+int iwl_scan_cancel(struct iwl_priv *priv)
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+{
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+ if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
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+ clear_bit(STATUS_SCANNING, &priv->status);
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+ return 0;
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+ }
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+
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+ if (test_bit(STATUS_SCANNING, &priv->status)) {
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+ if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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+ IWL_DEBUG_SCAN("Queuing scan abort.\n");
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+ set_bit(STATUS_SCAN_ABORTING, &priv->status);
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+ queue_work(priv->workqueue, &priv->abort_scan);
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+
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+ } else
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+ IWL_DEBUG_SCAN("Scan abort already in progress.\n");
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+
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+ return test_bit(STATUS_SCANNING, &priv->status);
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(iwl_scan_cancel);
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+/**
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+ * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
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+ * @ms: amount of time to wait (in milliseconds) for scan to abort
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+ *
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+ * NOTE: priv->mutex must be held before calling this function
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+ */
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+int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
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+{
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+ unsigned long now = jiffies;
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+ int ret;
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+
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+ ret = iwl_scan_cancel(priv);
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+ if (ret && ms) {
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+ mutex_unlock(&priv->mutex);
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+ while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
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+ test_bit(STATUS_SCANNING, &priv->status))
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+ msleep(1);
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+ mutex_lock(&priv->mutex);
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+
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+ return test_bit(STATUS_SCANNING, &priv->status);
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+ }
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+
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+ return ret;
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+}
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+EXPORT_SYMBOL(iwl_scan_cancel_timeout);
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+
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+static int iwl_send_scan_abort(struct iwl_priv *priv)
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+{
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+ int ret = 0;
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+ struct iwl_rx_packet *res;
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+ struct iwl_host_cmd cmd = {
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+ .id = REPLY_SCAN_ABORT_CMD,
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+ .meta.flags = CMD_WANT_SKB,
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+ };
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+
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+ /* If there isn't a scan actively going on in the hardware
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+ * then we are in between scan bands and not actually
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+ * actively scanning, so don't send the abort command */
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+ if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
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+ clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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+ return 0;
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+ }
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+
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+ ret = iwl_send_cmd_sync(priv, &cmd);
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+ if (ret) {
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+ clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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+ return ret;
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+ }
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+
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+ res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
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+ if (res->u.status != CAN_ABORT_STATUS) {
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+ /* The scan abort will return 1 for success or
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+ * 2 for "failure". A failure condition can be
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+ * due to simply not being in an active scan which
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+ * can occur if we send the scan abort before we
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+ * the microcode has notified us that a scan is
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+ * completed. */
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+ IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status);
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+ clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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+ clear_bit(STATUS_SCAN_HW, &priv->status);
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+ }
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+
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+ dev_kfree_skb_any(cmd.meta.u.skb);
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+
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+ return ret;
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+}
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+
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+
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+/* Service response to REPLY_SCAN_CMD (0x80) */
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+static void iwl_rx_reply_scan(struct iwl_priv *priv,
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+ struct iwl_rx_mem_buffer *rxb)
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+{
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+#ifdef CONFIG_IWLWIFI_DEBUG
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+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
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+ struct iwl_scanreq_notification *notif =
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+ (struct iwl_scanreq_notification *)pkt->u.raw;
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+
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+ IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status);
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+#endif
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+}
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+
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+/* Service SCAN_START_NOTIFICATION (0x82) */
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+static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
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+ struct iwl_rx_mem_buffer *rxb)
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+{
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+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
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+ struct iwl_scanstart_notification *notif =
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+ (struct iwl_scanstart_notification *)pkt->u.raw;
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+ priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
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+ IWL_DEBUG_SCAN("Scan start: "
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+ "%d [802.11%s] "
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+ "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
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+ notif->channel,
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+ notif->band ? "bg" : "a",
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+ notif->tsf_high,
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+ notif->tsf_low, notif->status, notif->beacon_timer);
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+}
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+
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+/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
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+static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
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+ struct iwl_rx_mem_buffer *rxb)
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+{
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+#ifdef CONFIG_IWLWIFI_DEBUG
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+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
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+ struct iwl_scanresults_notification *notif =
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+ (struct iwl_scanresults_notification *)pkt->u.raw;
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+
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+ IWL_DEBUG_SCAN("Scan ch.res: "
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+ "%d [802.11%s] "
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+ "(TSF: 0x%08X:%08X) - %d "
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+ "elapsed=%lu usec (%dms since last)\n",
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+ notif->channel,
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+ notif->band ? "bg" : "a",
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+ le32_to_cpu(notif->tsf_high),
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+ le32_to_cpu(notif->tsf_low),
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+ le32_to_cpu(notif->statistics[0]),
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+ le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
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+ jiffies_to_msecs(elapsed_jiffies
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+ (priv->last_scan_jiffies, jiffies)));
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+#endif
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+
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+ priv->last_scan_jiffies = jiffies;
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+ priv->next_scan_jiffies = 0;
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+}
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+
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+/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
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+static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
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+ struct iwl_rx_mem_buffer *rxb)
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+{
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+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
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+ struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
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+
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+ IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
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+ scan_notif->scanned_channels,
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+ scan_notif->tsf_low,
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+ scan_notif->tsf_high, scan_notif->status);
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+
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+ /* The HW is no longer scanning */
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+ clear_bit(STATUS_SCAN_HW, &priv->status);
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+
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+ /* The scan completion notification came in, so kill that timer... */
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+ cancel_delayed_work(&priv->scan_check);
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+
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+ IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
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+ (priv->scan_bands == 2) ? "2.4" : "5.2",
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+ jiffies_to_msecs(elapsed_jiffies
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+ (priv->scan_pass_start, jiffies)));
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+
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+ /* Remove this scanned band from the list
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+ * of pending bands to scan */
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+ priv->scan_bands--;
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+
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+ /* If a request to abort was given, or the scan did not succeed
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+ * then we reset the scan state machine and terminate,
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+ * re-queuing another scan if one has been requested */
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+ if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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+ IWL_DEBUG_INFO("Aborted scan completed.\n");
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+ clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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+ } else {
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+ /* If there are more bands on this scan pass reschedule */
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+ if (priv->scan_bands > 0)
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+ goto reschedule;
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+ }
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+
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+ priv->last_scan_jiffies = jiffies;
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+ priv->next_scan_jiffies = 0;
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+ IWL_DEBUG_INFO("Setting scan to off\n");
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+
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+ clear_bit(STATUS_SCANNING, &priv->status);
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+
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+ IWL_DEBUG_INFO("Scan took %dms\n",
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+ jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
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+
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+ queue_work(priv->workqueue, &priv->scan_completed);
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+
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+ return;
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+
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+reschedule:
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+ priv->scan_pass_start = jiffies;
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+ queue_work(priv->workqueue, &priv->request_scan);
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+}
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+
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+void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
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+{
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+ /* scan handlers */
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+ priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
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+ priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
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+ priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
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+ iwl_rx_scan_results_notif;
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+ priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
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+ iwl_rx_scan_complete_notif;
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+}
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+EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
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+
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+static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
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+ enum ieee80211_band band)
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+{
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+ if (band == IEEE80211_BAND_5GHZ)
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+ return IWL_ACTIVE_DWELL_TIME_52;
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+ else
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+ return IWL_ACTIVE_DWELL_TIME_24;
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+}
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+
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+static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
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+ enum ieee80211_band band)
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+{
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+ u16 active = iwl_get_active_dwell_time(priv, band);
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+ u16 passive = (band != IEEE80211_BAND_5GHZ) ?
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+ IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
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+ IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
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+
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+ if (iwl_is_associated(priv)) {
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+ /* If we're associated, we clamp the maximum passive
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+ * dwell time to be 98% of the beacon interval (minus
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+ * 2 * channel tune time) */
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+ passive = priv->beacon_int;
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+ if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
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+ passive = IWL_PASSIVE_DWELL_BASE;
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+ passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
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+ }
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+
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+ if (passive <= active)
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+ passive = active + 1;
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+
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+ return passive;
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+}
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+
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+static int iwl_get_channels_for_scan(struct iwl_priv *priv,
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+ enum ieee80211_band band,
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+ u8 is_active, u8 direct_mask,
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+ struct iwl_scan_channel *scan_ch)
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+{
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+ const struct ieee80211_channel *channels = NULL;
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+ const struct ieee80211_supported_band *sband;
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+ const struct iwl_channel_info *ch_info;
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+ u16 passive_dwell = 0;
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+ u16 active_dwell = 0;
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+ int added, i;
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+
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+ sband = iwl_get_hw_mode(priv, band);
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+ if (!sband)
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+ return 0;
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+
|
|
|
+ channels = sband->channels;
|
|
|
+
|
|
|
+ active_dwell = iwl_get_active_dwell_time(priv, band);
|
|
|
+ passive_dwell = iwl_get_passive_dwell_time(priv, band);
|
|
|
+
|
|
|
+ for (i = 0, added = 0; i < sband->n_channels; i++) {
|
|
|
+ if (channels[i].flags & IEEE80211_CHAN_DISABLED)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ scan_ch->channel =
|
|
|
+ ieee80211_frequency_to_channel(channels[i].center_freq);
|
|
|
+
|
|
|
+ ch_info = iwl_get_channel_info(priv, band,
|
|
|
+ scan_ch->channel);
|
|
|
+ if (!is_channel_valid(ch_info)) {
|
|
|
+ IWL_DEBUG_SCAN("Channel %d is INVALID for this SKU.\n",
|
|
|
+ scan_ch->channel);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!is_active || is_channel_passive(ch_info) ||
|
|
|
+ (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
|
|
|
+ scan_ch->type = 0; /* passive */
|
|
|
+ else
|
|
|
+ scan_ch->type = 1; /* active */
|
|
|
+
|
|
|
+ if (scan_ch->type & 1)
|
|
|
+ scan_ch->type |= (direct_mask << 1);
|
|
|
+
|
|
|
+ scan_ch->active_dwell = cpu_to_le16(active_dwell);
|
|
|
+ scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
|
|
|
+
|
|
|
+ /* Set txpower levels to defaults */
|
|
|
+ scan_ch->tpc.dsp_atten = 110;
|
|
|
+ /* scan_pwr_info->tpc.dsp_atten; */
|
|
|
+
|
|
|
+ /*scan_pwr_info->tpc.tx_gain; */
|
|
|
+ if (band == IEEE80211_BAND_5GHZ)
|
|
|
+ scan_ch->tpc.tx_gain = ((1 << 5) | (3 << 3)) | 3;
|
|
|
+ else {
|
|
|
+ scan_ch->tpc.tx_gain = ((1 << 5) | (5 << 3));
|
|
|
+ /* NOTE: if we were doing 6Mb OFDM for scans we'd use
|
|
|
+ * power level:
|
|
|
+ * scan_ch->tpc.tx_gain = ((1 << 5) | (2 << 3)) | 3;
|
|
|
+ */
|
|
|
+ }
|
|
|
+
|
|
|
+ IWL_DEBUG_SCAN("Scanning %d [%s %d]\n",
|
|
|
+ scan_ch->channel,
|
|
|
+ (scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
|
|
|
+ (scan_ch->type & 1) ?
|
|
|
+ active_dwell : passive_dwell);
|
|
|
+
|
|
|
+ scan_ch++;
|
|
|
+ added++;
|
|
|
+ }
|
|
|
+
|
|
|
+ IWL_DEBUG_SCAN("total channels to scan %d \n", added);
|
|
|
+ return added;
|
|
|
+}
|
|
|
+
|
|
|
+int iwl_scan_initiate(struct iwl_priv *priv)
|
|
|
+{
|
|
|
+ if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
|
|
|
+ IWL_ERROR("APs don't scan.\n");
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!iwl_is_ready_rf(priv)) {
|
|
|
+ IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (test_bit(STATUS_SCANNING, &priv->status)) {
|
|
|
+ IWL_DEBUG_SCAN("Scan already in progress.\n");
|
|
|
+ return -EAGAIN;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
|
+ IWL_DEBUG_SCAN("Scan request while abort pending. "
|
|
|
+ "Queuing.\n");
|
|
|
+ return -EAGAIN;
|
|
|
+ }
|
|
|
+
|
|
|
+ IWL_DEBUG_INFO("Starting scan...\n");
|
|
|
+ priv->scan_bands = 2;
|
|
|
+ set_bit(STATUS_SCANNING, &priv->status);
|
|
|
+ priv->scan_start = jiffies;
|
|
|
+ priv->scan_pass_start = priv->scan_start;
|
|
|
+
|
|
|
+ queue_work(priv->workqueue, &priv->request_scan);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(iwl_scan_initiate);
|
|
|
+
|
|
|
+#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
|
|
|
+
|
|
|
+static void iwl_bg_scan_check(struct work_struct *data)
|
|
|
+{
|
|
|
+ struct iwl_priv *priv =
|
|
|
+ container_of(data, struct iwl_priv, scan_check.work);
|
|
|
+
|
|
|
+ if (test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
|
+ return;
|
|
|
+
|
|
|
+ mutex_lock(&priv->mutex);
|
|
|
+ if (test_bit(STATUS_SCANNING, &priv->status) ||
|
|
|
+ test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
|
+ IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
|
|
|
+ "adapter (%dms)\n",
|
|
|
+ jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
|
|
|
+
|
|
|
+ if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
|
+ iwl_send_scan_abort(priv);
|
|
|
+ }
|
|
|
+ mutex_unlock(&priv->mutex);
|
|
|
+}
|
|
|
+/**
|
|
|
+ * iwl_supported_rate_to_ie - fill in the supported rate in IE field
|
|
|
+ *
|
|
|
+ * return : set the bit for each supported rate insert in ie
|
|
|
+ */
|
|
|
+static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
|
|
|
+ u16 basic_rate, int *left)
|
|
|
+{
|
|
|
+ u16 ret_rates = 0, bit;
|
|
|
+ int i;
|
|
|
+ u8 *cnt = ie;
|
|
|
+ u8 *rates = ie + 1;
|
|
|
+
|
|
|
+ for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
|
|
|
+ if (bit & supported_rate) {
|
|
|
+ ret_rates |= bit;
|
|
|
+ rates[*cnt] = iwl_rates[i].ieee |
|
|
|
+ ((bit & basic_rate) ? 0x80 : 0x00);
|
|
|
+ (*cnt)++;
|
|
|
+ (*left)--;
|
|
|
+ if ((*left <= 0) ||
|
|
|
+ (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return ret_rates;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
|
|
|
+ u8 *pos, int *left)
|
|
|
+{
|
|
|
+ struct ieee80211_ht_cap *ht_cap;
|
|
|
+
|
|
|
+ if (!sband || !sband->ht_info.ht_supported)
|
|
|
+ return;
|
|
|
+
|
|
|
+ if (*left < sizeof(struct ieee80211_ht_cap))
|
|
|
+ return;
|
|
|
+
|
|
|
+ *pos++ = sizeof(struct ieee80211_ht_cap);
|
|
|
+ ht_cap = (struct ieee80211_ht_cap *) pos;
|
|
|
+
|
|
|
+ ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
|
|
|
+ memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
|
|
|
+ ht_cap->ampdu_params_info =
|
|
|
+ (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
|
|
|
+ ((sband->ht_info.ampdu_density << 2) &
|
|
|
+ IEEE80211_HT_CAP_AMPDU_DENSITY);
|
|
|
+ *left -= sizeof(struct ieee80211_ht_cap);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * iwl_fill_probe_req - fill in all required fields and IE for probe request
|
|
|
+ */
|
|
|
+static u16 iwl_fill_probe_req(struct iwl_priv *priv,
|
|
|
+ enum ieee80211_band band,
|
|
|
+ struct ieee80211_mgmt *frame,
|
|
|
+ int left, int is_direct)
|
|
|
+{
|
|
|
+ int len = 0;
|
|
|
+ u8 *pos = NULL;
|
|
|
+ u16 active_rates, ret_rates, cck_rates, active_rate_basic;
|
|
|
+ const struct ieee80211_supported_band *sband =
|
|
|
+ iwl_get_hw_mode(priv, band);
|
|
|
+
|
|
|
+ /* Make sure there is enough space for the probe request,
|
|
|
+ * two mandatory IEs and the data */
|
|
|
+ left -= 24;
|
|
|
+ if (left < 0)
|
|
|
+ return 0;
|
|
|
+ len += 24;
|
|
|
+
|
|
|
+ frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
|
|
|
+ memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
|
|
|
+ memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
|
|
|
+ memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
|
|
|
+ frame->seq_ctrl = 0;
|
|
|
+
|
|
|
+ /* fill in our indirect SSID IE */
|
|
|
+ /* ...next IE... */
|
|
|
+
|
|
|
+ left -= 2;
|
|
|
+ if (left < 0)
|
|
|
+ return 0;
|
|
|
+ len += 2;
|
|
|
+ pos = &(frame->u.probe_req.variable[0]);
|
|
|
+ *pos++ = WLAN_EID_SSID;
|
|
|
+ *pos++ = 0;
|
|
|
+
|
|
|
+ /* fill in our direct SSID IE... */
|
|
|
+ if (is_direct) {
|
|
|
+ /* ...next IE... */
|
|
|
+ left -= 2 + priv->essid_len;
|
|
|
+ if (left < 0)
|
|
|
+ return 0;
|
|
|
+ /* ... fill it in... */
|
|
|
+ *pos++ = WLAN_EID_SSID;
|
|
|
+ *pos++ = priv->essid_len;
|
|
|
+ memcpy(pos, priv->essid, priv->essid_len);
|
|
|
+ pos += priv->essid_len;
|
|
|
+ len += 2 + priv->essid_len;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* fill in supported rate */
|
|
|
+ /* ...next IE... */
|
|
|
+ left -= 2;
|
|
|
+ if (left < 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ /* ... fill it in... */
|
|
|
+ *pos++ = WLAN_EID_SUPP_RATES;
|
|
|
+ *pos = 0;
|
|
|
+
|
|
|
+ /* exclude 60M rate */
|
|
|
+ active_rates = priv->rates_mask;
|
|
|
+ active_rates &= ~IWL_RATE_60M_MASK;
|
|
|
+
|
|
|
+ active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
|
|
|
+
|
|
|
+ cck_rates = IWL_CCK_RATES_MASK & active_rates;
|
|
|
+ ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
|
|
|
+ active_rate_basic, &left);
|
|
|
+ active_rates &= ~ret_rates;
|
|
|
+
|
|
|
+ ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
|
|
|
+ active_rate_basic, &left);
|
|
|
+ active_rates &= ~ret_rates;
|
|
|
+
|
|
|
+ len += 2 + *pos;
|
|
|
+ pos += (*pos) + 1;
|
|
|
+ if (active_rates == 0)
|
|
|
+ goto fill_end;
|
|
|
+
|
|
|
+ /* fill in supported extended rate */
|
|
|
+ /* ...next IE... */
|
|
|
+ left -= 2;
|
|
|
+ if (left < 0)
|
|
|
+ return 0;
|
|
|
+ /* ... fill it in... */
|
|
|
+ *pos++ = WLAN_EID_EXT_SUPP_RATES;
|
|
|
+ *pos = 0;
|
|
|
+ iwl_supported_rate_to_ie(pos, active_rates,
|
|
|
+ active_rate_basic, &left);
|
|
|
+ if (*pos > 0)
|
|
|
+ len += 2 + *pos;
|
|
|
+
|
|
|
+ fill_end:
|
|
|
+ /* fill in HT IE */
|
|
|
+ left -= 2;
|
|
|
+ if (left < 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ *pos++ = WLAN_EID_HT_CAPABILITY;
|
|
|
+ *pos = 0;
|
|
|
+
|
|
|
+ iwl_ht_cap_to_ie(sband, pos, &left);
|
|
|
+
|
|
|
+ if (*pos > 0)
|
|
|
+ len += 2 + *pos;
|
|
|
+ return (u16)len;
|
|
|
+}
|
|
|
+
|
|
|
+static void iwl_bg_request_scan(struct work_struct *data)
|
|
|
+{
|
|
|
+ struct iwl_priv *priv =
|
|
|
+ container_of(data, struct iwl_priv, request_scan);
|
|
|
+ struct iwl_host_cmd cmd = {
|
|
|
+ .id = REPLY_SCAN_CMD,
|
|
|
+ .len = sizeof(struct iwl_scan_cmd),
|
|
|
+ .meta.flags = CMD_SIZE_HUGE,
|
|
|
+ };
|
|
|
+ struct iwl_scan_cmd *scan;
|
|
|
+ struct ieee80211_conf *conf = NULL;
|
|
|
+ u16 cmd_len;
|
|
|
+ enum ieee80211_band band;
|
|
|
+ u8 direct_mask;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ conf = ieee80211_get_hw_conf(priv->hw);
|
|
|
+
|
|
|
+ mutex_lock(&priv->mutex);
|
|
|
+
|
|
|
+ if (!iwl_is_ready(priv)) {
|
|
|
+ IWL_WARNING("request scan called when driver not ready.\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Make sure the scan wasn't cancelled before this queued work
|
|
|
+ * was given the chance to run... */
|
|
|
+ if (!test_bit(STATUS_SCANNING, &priv->status))
|
|
|
+ goto done;
|
|
|
+
|
|
|
+ /* This should never be called or scheduled if there is currently
|
|
|
+ * a scan active in the hardware. */
|
|
|
+ if (test_bit(STATUS_SCAN_HW, &priv->status)) {
|
|
|
+ IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
|
|
|
+ "Ignoring second request.\n");
|
|
|
+ ret = -EIO;
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
|
|
|
+ IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
|
+ IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (iwl_is_rfkill(priv)) {
|
|
|
+ IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!test_bit(STATUS_READY, &priv->status)) {
|
|
|
+ IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!priv->scan_bands) {
|
|
|
+ IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!priv->scan) {
|
|
|
+ priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
|
|
|
+ IWL_MAX_SCAN_SIZE, GFP_KERNEL);
|
|
|
+ if (!priv->scan) {
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ scan = priv->scan;
|
|
|
+ memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
|
|
|
+
|
|
|
+ scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
|
|
|
+ scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
|
|
|
+
|
|
|
+ if (iwl_is_associated(priv)) {
|
|
|
+ u16 interval = 0;
|
|
|
+ u32 extra;
|
|
|
+ u32 suspend_time = 100;
|
|
|
+ u32 scan_suspend_time = 100;
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ IWL_DEBUG_INFO("Scanning while associated...\n");
|
|
|
+
|
|
|
+ spin_lock_irqsave(&priv->lock, flags);
|
|
|
+ interval = priv->beacon_int;
|
|
|
+ spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
+
|
|
|
+ scan->suspend_time = 0;
|
|
|
+ scan->max_out_time = cpu_to_le32(200 * 1024);
|
|
|
+ if (!interval)
|
|
|
+ interval = suspend_time;
|
|
|
+
|
|
|
+ extra = (suspend_time / interval) << 22;
|
|
|
+ scan_suspend_time = (extra |
|
|
|
+ ((suspend_time % interval) * 1024));
|
|
|
+ scan->suspend_time = cpu_to_le32(scan_suspend_time);
|
|
|
+ IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
|
|
|
+ scan_suspend_time, interval);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* We should add the ability for user to lock to PASSIVE ONLY */
|
|
|
+ if (priv->one_direct_scan) {
|
|
|
+ IWL_DEBUG_SCAN
|
|
|
+ ("Kicking off one direct scan for '%s'\n",
|
|
|
+ iwl_escape_essid(priv->direct_ssid,
|
|
|
+ priv->direct_ssid_len));
|
|
|
+ scan->direct_scan[0].id = WLAN_EID_SSID;
|
|
|
+ scan->direct_scan[0].len = priv->direct_ssid_len;
|
|
|
+ memcpy(scan->direct_scan[0].ssid,
|
|
|
+ priv->direct_ssid, priv->direct_ssid_len);
|
|
|
+ direct_mask = 1;
|
|
|
+ } else if (!iwl_is_associated(priv) && priv->essid_len) {
|
|
|
+ IWL_DEBUG_SCAN
|
|
|
+ ("Kicking off one direct scan for '%s' when not associated\n",
|
|
|
+ iwl_escape_essid(priv->essid, priv->essid_len));
|
|
|
+ scan->direct_scan[0].id = WLAN_EID_SSID;
|
|
|
+ scan->direct_scan[0].len = priv->essid_len;
|
|
|
+ memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
|
|
|
+ direct_mask = 1;
|
|
|
+ } else {
|
|
|
+ IWL_DEBUG_SCAN("Kicking off one indirect scan.\n");
|
|
|
+ direct_mask = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
|
|
|
+ scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
|
|
|
+ scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
|
|
|
+
|
|
|
+
|
|
|
+ switch (priv->scan_bands) {
|
|
|
+ case 2:
|
|
|
+ scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
|
|
|
+ scan->tx_cmd.rate_n_flags =
|
|
|
+ iwl4965_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
|
|
|
+ RATE_MCS_ANT_B_MSK|RATE_MCS_CCK_MSK);
|
|
|
+
|
|
|
+ scan->good_CRC_th = 0;
|
|
|
+ band = IEEE80211_BAND_2GHZ;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 1:
|
|
|
+ scan->tx_cmd.rate_n_flags =
|
|
|
+ iwl4965_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
|
|
|
+ RATE_MCS_ANT_B_MSK);
|
|
|
+ scan->good_CRC_th = IWL_GOOD_CRC_TH;
|
|
|
+ band = IEEE80211_BAND_5GHZ;
|
|
|
+ break;
|
|
|
+
|
|
|
+ default:
|
|
|
+ IWL_WARNING("Invalid scan band count\n");
|
|
|
+ goto done;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* We don't build a direct scan probe request; the uCode will do
|
|
|
+ * that based on the direct_mask added to each channel entry */
|
|
|
+ cmd_len = iwl_fill_probe_req(priv, band,
|
|
|
+ (struct ieee80211_mgmt *)scan->data,
|
|
|
+ IWL_MAX_SCAN_SIZE - sizeof(*scan), 0);
|
|
|
+
|
|
|
+ scan->tx_cmd.len = cpu_to_le16(cmd_len);
|
|
|
+ /* select Rx chains */
|
|
|
+
|
|
|
+ /* Force use of chains B and C (0x6) for scan Rx.
|
|
|
+ * Avoid A (0x1) because of its off-channel reception on A-band.
|
|
|
+ * MIMO is not used here, but value is required to make uCode happy. */
|
|
|
+ scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
|
|
|
+ cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
|
|
|
+ (0x6 << RXON_RX_CHAIN_FORCE_SEL_POS) |
|
|
|
+ (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
|
|
|
+
|
|
|
+ if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
|
|
|
+ scan->filter_flags = RXON_FILTER_PROMISC_MSK;
|
|
|
+
|
|
|
+ if (direct_mask)
|
|
|
+ scan->channel_count =
|
|
|
+ iwl_get_channels_for_scan(
|
|
|
+ priv, band, 1, /* active */
|
|
|
+ direct_mask,
|
|
|
+ (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
|
|
|
+ else
|
|
|
+ scan->channel_count =
|
|
|
+ iwl_get_channels_for_scan(
|
|
|
+ priv, band, 0, /* passive */
|
|
|
+ direct_mask,
|
|
|
+ (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
|
|
|
+
|
|
|
+ scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
|
|
|
+ RXON_FILTER_BCON_AWARE_MSK);
|
|
|
+ cmd.len += le16_to_cpu(scan->tx_cmd.len) +
|
|
|
+ scan->channel_count * sizeof(struct iwl_scan_channel);
|
|
|
+ cmd.data = scan;
|
|
|
+ scan->len = cpu_to_le16(cmd.len);
|
|
|
+
|
|
|
+ set_bit(STATUS_SCAN_HW, &priv->status);
|
|
|
+ ret = iwl_send_cmd_sync(priv, &cmd);
|
|
|
+ if (ret)
|
|
|
+ goto done;
|
|
|
+
|
|
|
+ queue_delayed_work(priv->workqueue, &priv->scan_check,
|
|
|
+ IWL_SCAN_CHECK_WATCHDOG);
|
|
|
+
|
|
|
+ mutex_unlock(&priv->mutex);
|
|
|
+ return;
|
|
|
+
|
|
|
+ done:
|
|
|
+ /* inform mac80211 scan aborted */
|
|
|
+ queue_work(priv->workqueue, &priv->scan_completed);
|
|
|
+ mutex_unlock(&priv->mutex);
|
|
|
+}
|
|
|
+
|
|
|
+static void iwl_bg_abort_scan(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
|
|
|
+
|
|
|
+ if (!iwl_is_ready(priv))
|
|
|
+ return;
|
|
|
+
|
|
|
+ mutex_lock(&priv->mutex);
|
|
|
+
|
|
|
+ set_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
|
+ iwl_send_scan_abort(priv);
|
|
|
+
|
|
|
+ mutex_unlock(&priv->mutex);
|
|
|
+}
|
|
|
+
|
|
|
+void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
|
|
|
+{
|
|
|
+ /* FIXME: move here when resolved PENDING
|
|
|
+ * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
|
|
|
+ INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
|
|
|
+ INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
|
|
|
+ INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
|
|
|
+
|
Tomas Winkler