Quelle  scan.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file is part of wl12xx
 *
 * Copyright (C) 2012 Texas Instruments. All rights reserved.
 */

#include <linux/ieee80211.h>
#include "scan.h"
#include "../wlcore/debug.h"
#include "../wlcore/tx.h"

static int wl1271_get_scan_channels(struct wl1271 *wl,
        struct cfg80211_scan_request *req,
        struct basic_scan_channel_params *channels,
        enum nl80211_band band, bool passive)
{
 struct conf_scan_settings *c = &wl->conf.scan;
 int i, j;
 u32 flags;

 for (i = 0, j = 0;
      i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
      i++) {
  flags = req->channels[i]->flags;

  if (!test_bit(i, wl->scan.scanned_ch) &&
      !(flags & IEEE80211_CHAN_DISABLED) &&
      (req->channels[i]->band == band) &&
      /*
     * In passive scans, we scan all remaining
     * channels, even if not marked as such.
     * In active scans, we only scan channels not
     * marked as passive.
     */
      (passive || !(flags & IEEE80211_CHAN_NO_IR))) {
   wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
         req->channels[i]->band,
         req->channels[i]->center_freq);
   wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
         req->channels[i]->hw_value,
         req->channels[i]->flags);
   wl1271_debug(DEBUG_SCAN,
         "max_antenna_gain %d, max_power %d",
         req->channels[i]->max_antenna_gain,
         req->channels[i]->max_power);
   wl1271_debug(DEBUG_SCAN, "beacon_found %d",
         req->channels[i]->beacon_found);

   if (!passive) {
    channels[j].min_duration =
     cpu_to_le32(c->min_dwell_time_active);
    channels[j].max_duration =
     cpu_to_le32(c->max_dwell_time_active);
   } else {
    channels[j].min_duration =
     cpu_to_le32(c->dwell_time_passive);
    channels[j].max_duration =
     cpu_to_le32(c->dwell_time_passive);
   }
   channels[j].early_termination = 0;
   channels[j].tx_power_att = req->channels[i]->max_power;
   channels[j].channel = req->channels[i]->hw_value;

   memset(&channels[j].bssid_lsb, 0xff, 4);
   memset(&channels[j].bssid_msb, 0xff, 2);

   /* Mark the channels we already used */
   set_bit(i, wl->scan.scanned_ch);

   j++;
  }
 }

 return j;
}

#define WL1271_NOTHING_TO_SCAN 1

static int wl1271_scan_send(struct wl1271 *wl, struct wl12xx_vif *wlvif,
       enum nl80211_band band,
       bool passive, u32 basic_rate)
{
 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 struct wl1271_cmd_scan *cmd;
 struct wl1271_cmd_trigger_scan_to *trigger;
 int ret;
 u16 scan_options = 0;

 /* skip active scans if we don't have SSIDs */
 if (!passive && wl->scan.req->n_ssids == 0)
  return WL1271_NOTHING_TO_SCAN;

 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 if (!cmd || !trigger) {
  ret = -ENOMEM;
  goto out;
 }

 if (wl->conf.scan.split_scan_timeout)
  scan_options |= WL1271_SCAN_OPT_SPLIT_SCAN;

 if (passive)
  scan_options |= WL1271_SCAN_OPT_PASSIVE;

 /* scan on the dev role if the regular one is not started */
 if (wlcore_is_p2p_mgmt(wlvif))
  cmd->params.role_id = wlvif->dev_role_id;
 else
  cmd->params.role_id = wlvif->role_id;

 if (WARN_ON(cmd->params.role_id == WL12XX_INVALID_ROLE_ID)) {
  ret = -EINVAL;
  goto out;
 }

 cmd->params.scan_options = cpu_to_le16(scan_options);

 cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
          cmd->channels,
          band, passive);
 if (cmd->params.n_ch == 0) {
  ret = WL1271_NOTHING_TO_SCAN;
  goto out;
 }

 cmd->params.tx_rate = cpu_to_le32(basic_rate);
 cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 cmd->params.tid_trigger = CONF_TX_AC_ANY_TID;
 cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;

 if (band == NL80211_BAND_2GHZ)
  cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 else
  cmd->params.band = WL1271_SCAN_BAND_5_GHZ;

 if (wl->scan.ssid_len) {
  cmd->params.ssid_len = wl->scan.ssid_len;
  memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 }

 memcpy(cmd->addr, vif->addr, ETH_ALEN);

 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
      cmd->params.role_id, band,
      wl->scan.ssid, wl->scan.ssid_len,
      wl->scan.req->ie,
      wl->scan.req->ie_len, NULL, 0, false);
 if (ret < 0) {
  wl1271_error("PROBE request template failed");
  goto out;
 }

 trigger->timeout = cpu_to_le32(wl->conf.scan.split_scan_timeout);
 ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
         sizeof(*trigger), 0);
 if (ret < 0) {
  wl1271_error("trigger scan to failed for hw scan");
  goto out;
 }

 wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));

 ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 if (ret < 0) {
  wl1271_error("SCAN failed");
  goto out;
 }

out:
 kfree(cmd);
 kfree(trigger);
 return ret;
}

int wl12xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif)
{
 struct wl1271_cmd_header *cmd = NULL;
 int ret = 0;

 if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
  return -EINVAL;

 wl1271_debug(DEBUG_CMD, "cmd scan stop");

 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 if (!cmd) {
  ret = -ENOMEM;
  goto out;
 }

 ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
         sizeof(*cmd), 0);
 if (ret < 0) {
  wl1271_error("cmd stop_scan failed");
  goto out;
 }
out:
 kfree(cmd);
 return ret;
}

void wl1271_scan_stm(struct wl1271 *wl, struct wl12xx_vif *wlvif)
{
 int ret = 0;
 enum nl80211_band band;
 u32 rate, mask;

 switch (wl->scan.state) {
 case WL1271_SCAN_STATE_IDLE:
  break;

 case WL1271_SCAN_STATE_2GHZ_ACTIVE:
  band = NL80211_BAND_2GHZ;
  mask = wlvif->bitrate_masks[band];
  if (wl->scan.req->no_cck) {
   mask &= ~CONF_TX_CCK_RATES;
   if (!mask)
    mask = CONF_TX_RATE_MASK_BASIC_P2P;
  }
  rate = wl1271_tx_min_rate_get(wl, mask);
  ret = wl1271_scan_send(wl, wlvif, band, false, rate);
  if (ret == WL1271_NOTHING_TO_SCAN) {
   wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
   wl1271_scan_stm(wl, wlvif);
  }

  break;

 case WL1271_SCAN_STATE_2GHZ_PASSIVE:
  band = NL80211_BAND_2GHZ;
  mask = wlvif->bitrate_masks[band];
  if (wl->scan.req->no_cck) {
   mask &= ~CONF_TX_CCK_RATES;
   if (!mask)
    mask = CONF_TX_RATE_MASK_BASIC_P2P;
  }
  rate = wl1271_tx_min_rate_get(wl, mask);
  ret = wl1271_scan_send(wl, wlvif, band, true, rate);
  if (ret == WL1271_NOTHING_TO_SCAN) {
   if (wl->enable_11a)
    wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
   else
    wl->scan.state = WL1271_SCAN_STATE_DONE;
   wl1271_scan_stm(wl, wlvif);
  }

  break;

 case WL1271_SCAN_STATE_5GHZ_ACTIVE:
  band = NL80211_BAND_5GHZ;
  rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
  ret = wl1271_scan_send(wl, wlvif, band, false, rate);
  if (ret == WL1271_NOTHING_TO_SCAN) {
   wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
   wl1271_scan_stm(wl, wlvif);
  }

  break;

 case WL1271_SCAN_STATE_5GHZ_PASSIVE:
  band = NL80211_BAND_5GHZ;
  rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
  ret = wl1271_scan_send(wl, wlvif, band, true, rate);
  if (ret == WL1271_NOTHING_TO_SCAN) {
   wl->scan.state = WL1271_SCAN_STATE_DONE;
   wl1271_scan_stm(wl, wlvif);
  }

  break;

 case WL1271_SCAN_STATE_DONE:
  wl->scan.failed = false;
  cancel_delayed_work(&wl->scan_complete_work);
  ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
          msecs_to_jiffies(0));
  break;

 default:
  wl1271_error("invalid scan state");
  break;
 }

 if (ret < 0) {
  cancel_delayed_work(&wl->scan_complete_work);
  ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
          msecs_to_jiffies(0));
 }
}

static void wl12xx_adjust_channels(struct wl1271_cmd_sched_scan_config *cmd,
       struct wlcore_scan_channels *cmd_channels)
{
 memcpy(cmd->passive, cmd_channels->passive, sizeof(cmd->passive));
 memcpy(cmd->active, cmd_channels->active, sizeof(cmd->active));
 cmd->dfs = cmd_channels->dfs;
 cmd->n_pactive_ch = cmd_channels->passive_active;

 memcpy(cmd->channels_2, cmd_channels->channels_2,
        sizeof(cmd->channels_2));
 memcpy(cmd->channels_5, cmd_channels->channels_5,
        sizeof(cmd->channels_5));
 /* channels_4 are not supported, so no need to copy them */
}

int wl1271_scan_sched_scan_config(struct wl1271 *wl,
      struct wl12xx_vif *wlvif,
      struct cfg80211_sched_scan_request *req,
      struct ieee80211_scan_ies *ies)
{
 struct wl1271_cmd_sched_scan_config *cfg = NULL;
 struct wlcore_scan_channels *cfg_channels = NULL;
 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 int i, ret;
 bool force_passive = !req->n_ssids;

 wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");

 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 if (!cfg)
  return -ENOMEM;

 cfg->role_id = wlvif->role_id;
 cfg->rssi_threshold = c->rssi_threshold;
 cfg->snr_threshold  = c->snr_threshold;
 cfg->n_probe_reqs = c->num_probe_reqs;
 /* cycles set to 0 it means infinite (until manually stopped) */
 cfg->cycles = 0;
 /* report APs when at least 1 is found */
 cfg->report_after = 1;
 /* don't stop scanning automatically when something is found */
 cfg->terminate = 0;
 cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 /* don't filter on BSS type */
 cfg->bss_type = SCAN_BSS_TYPE_ANY;
 /* currently NL80211 supports only a single interval */
 for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
  cfg->intervals[i] = cpu_to_le32(req->scan_plans[0].interval *
      MSEC_PER_SEC);

 cfg->ssid_len = 0;
 ret = wlcore_scan_sched_scan_ssid_list(wl, wlvif, req);
 if (ret < 0)
  goto out;

 cfg->filter_type = ret;

 wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);

 cfg_channels = kzalloc(sizeof(*cfg_channels), GFP_KERNEL);
 if (!cfg_channels) {
  ret = -ENOMEM;
  goto out;
 }

 if (!wlcore_set_scan_chan_params(wl, cfg_channels, req->channels,
      req->n_channels, req->n_ssids,
      SCAN_TYPE_PERIODIC)) {
  wl1271_error("scan channel list is empty");
  ret = -EINVAL;
  goto out;
 }
 wl12xx_adjust_channels(cfg, cfg_channels);

 if (!force_passive && cfg->active[0]) {
  u8 band = NL80211_BAND_2GHZ;
  ret = wl12xx_cmd_build_probe_req(wl, wlvif,
       wlvif->role_id, band,
       req->ssids[0].ssid,
       req->ssids[0].ssid_len,
       ies->ies[band],
       ies->len[band],
       ies->common_ies,
       ies->common_ie_len,
       true);
  if (ret < 0) {
   wl1271_error("2.4GHz PROBE request template failed");
   goto out;
  }
 }

 if (!force_passive && cfg->active[1]) {
  u8 band = NL80211_BAND_5GHZ;
  ret = wl12xx_cmd_build_probe_req(wl, wlvif,
       wlvif->role_id, band,
       req->ssids[0].ssid,
       req->ssids[0].ssid_len,
       ies->ies[band],
       ies->len[band],
       ies->common_ies,
       ies->common_ie_len,
       true);
  if (ret < 0) {
   wl1271_error("5GHz PROBE request template failed");
   goto out;
  }
 }

 wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));

 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
         sizeof(*cfg), 0);
 if (ret < 0) {
  wl1271_error("SCAN configuration failed");
  goto out;
 }
out:
 kfree(cfg_channels);
 kfree(cfg);
 return ret;
}

int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif)
{
 struct wl1271_cmd_sched_scan_start *start;
 int ret = 0;

 wl1271_debug(DEBUG_CMD, "cmd periodic scan start");

 if (wlvif->bss_type != BSS_TYPE_STA_BSS)
  return -EOPNOTSUPP;

 if ((wl->quirks & WLCORE_QUIRK_NO_SCHED_SCAN_WHILE_CONN) &&
     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  return -EBUSY;

 start = kzalloc(sizeof(*start), GFP_KERNEL);
 if (!start)
  return -ENOMEM;

 start->role_id = wlvif->role_id;
 start->tag = WL1271_SCAN_DEFAULT_TAG;

 ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
         sizeof(*start), 0);
 if (ret < 0) {
  wl1271_error("failed to send scan start command");
  goto out_free;
 }

out_free:
 kfree(start);
 return ret;
}

int wl12xx_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif  *wlvif,
       struct cfg80211_sched_scan_request *req,
       struct ieee80211_scan_ies *ies)
{
 int ret;

 ret = wl1271_scan_sched_scan_config(wl, wlvif, req, ies);
 if (ret < 0)
  return ret;

 return wl1271_scan_sched_scan_start(wl, wlvif);
}

void wl12xx_scan_sched_scan_stop(struct wl1271 *wl,  struct wl12xx_vif *wlvif)
{
 struct wl1271_cmd_sched_scan_stop *stop;
 int ret = 0;

 wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");

 /* FIXME: what to do if alloc'ing to stop fails? */
 stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 if (!stop) {
  wl1271_error("failed to alloc memory to send sched scan stop");
  return;
 }

 stop->role_id = wlvif->role_id;
 stop->tag = WL1271_SCAN_DEFAULT_TAG;

 ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
         sizeof(*stop), 0);
 if (ret < 0) {
  wl1271_error("failed to send sched scan stop command");
  goto out_free;
 }

out_free:
 kfree(stop);
}

int wl12xx_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
        struct cfg80211_scan_request *req)
{
 wl1271_scan_stm(wl, wlvif);
 return 0;
}

void wl12xx_scan_completed(struct wl1271 *wl, struct wl12xx_vif *wlvif)
{
 wl1271_scan_stm(wl, wlvif);
}