Quelle  scan.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file is part of wl1271
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 */

#include <linux/ieee80211.h>
#include <linux/pm_runtime.h>

#include "wlcore.h"
#include "debug.h"
#include "cmd.h"
#include "scan.h"
#include "acx.h"
#include "tx.h"

void wl1271_scan_complete_work(struct work_struct *work)
{
 struct delayed_work *dwork;
 struct wl1271 *wl;
 struct wl12xx_vif *wlvif;
 struct cfg80211_scan_info info = {
  .aborted = false,
 };
 int ret;

 dwork = to_delayed_work(work);
 wl = container_of(dwork, struct wl1271, scan_complete_work);

 wl1271_debug(DEBUG_SCAN, "Scanning complete");

 mutex_lock(&wl->mutex);

 if (unlikely(wl->state != WLCORE_STATE_ON))
  goto out;

 if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
  goto out;

 wlvif = wl->scan_wlvif;

 /*
 * Rearm the tx watchdog just before idling scan. This
 * prevents just-finished scans from triggering the watchdog
 */
 wl12xx_rearm_tx_watchdog_locked(wl);

 wl->scan.state = WL1271_SCAN_STATE_IDLE;
 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 wl->scan.req = NULL;
 wl->scan_wlvif = NULL;

 ret = pm_runtime_resume_and_get(wl->dev);
 if (ret < 0)
  goto out;

 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  /* restore hardware connection monitoring template */
  wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
 }

 if (wl->scan.failed) {
  wl1271_info("Scan completed due to error.");
  wl12xx_queue_recovery_work(wl);
 }

 wlcore_cmd_regdomain_config_locked(wl);

 pm_runtime_mark_last_busy(wl->dev);
 pm_runtime_put_autosuspend(wl->dev);

 ieee80211_scan_completed(wl->hw, &info);

out:
 mutex_unlock(&wl->mutex);

}

static void wlcore_started_vifs_iter(void *data, u8 *mac,
         struct ieee80211_vif *vif)
{
 struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 bool active = false;
 int *count = (int *)data;

 /*
 * count active interfaces according to interface type.
 * checking only bss_conf.idle is bad for some cases, e.g.
 * we don't want to count sta in p2p_find as active interface.
 */
 switch (wlvif->bss_type) {
 case BSS_TYPE_STA_BSS:
  if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
   active = true;
  break;

 case BSS_TYPE_AP_BSS:
  if (wlvif->wl->active_sta_count > 0)
   active = true;
  break;

 default:
  break;
 }

 if (active)
  (*count)++;
}

static int wlcore_count_started_vifs(struct wl1271 *wl)
{
 int count = 0;

 ieee80211_iterate_active_interfaces_atomic(wl->hw,
     IEEE80211_IFACE_ITER_RESUME_ALL,
     wlcore_started_vifs_iter, &count);
 return count;
}

static int
wlcore_scan_get_channels(struct wl1271 *wl,
    struct ieee80211_channel *req_channels[],
    u32 n_channels,
    u32 n_ssids,
    struct conn_scan_ch_params *channels,
    u32 band, bool radar, bool passive,
    int start, int max_channels,
    u8 *n_pactive_ch,
    int scan_type)
{
 int i, j;
 u32 flags;
 bool force_passive = !n_ssids;
 u32 min_dwell_time_active, max_dwell_time_active;
 u32 dwell_time_passive, dwell_time_dfs;

 /* configure dwell times according to scan type */
 if (scan_type == SCAN_TYPE_SEARCH) {
  struct conf_scan_settings *c = &wl->conf.scan;
  bool active_vif_exists = !!wlcore_count_started_vifs(wl);

  min_dwell_time_active = active_vif_exists ?
   c->min_dwell_time_active :
   c->min_dwell_time_active_long;
  max_dwell_time_active = active_vif_exists ?
   c->max_dwell_time_active :
   c->max_dwell_time_active_long;
  dwell_time_passive = c->dwell_time_passive;
  dwell_time_dfs = c->dwell_time_dfs;
 } else {
  struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
  u32 delta_per_probe;

  if (band == NL80211_BAND_5GHZ)
   delta_per_probe = c->dwell_time_delta_per_probe_5;
  else
   delta_per_probe = c->dwell_time_delta_per_probe;

  min_dwell_time_active = c->base_dwell_time +
    n_ssids * c->num_probe_reqs * delta_per_probe;

  max_dwell_time_active = min_dwell_time_active +
     c->max_dwell_time_delta;
  dwell_time_passive = c->dwell_time_passive;
  dwell_time_dfs = c->dwell_time_dfs;
 }
 min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);

 for (i = 0, j = start;
      i < n_channels && j < max_channels;
      i++) {
  flags = req_channels[i]->flags;

  if (force_passive)
   flags |= IEEE80211_CHAN_NO_IR;

  if ((req_channels[i]->band == band) &&
      !(flags & IEEE80211_CHAN_DISABLED) &&
      (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
      /* if radar is set, we ignore the passive flag */
      (radar ||
       !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
   if (flags & IEEE80211_CHAN_RADAR) {
    channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;

    channels[j].passive_duration =
     cpu_to_le16(dwell_time_dfs);
   } else {
    channels[j].passive_duration =
     cpu_to_le16(dwell_time_passive);
   }

   channels[j].min_duration =
    cpu_to_le16(min_dwell_time_active);
   channels[j].max_duration =
    cpu_to_le16(max_dwell_time_active);

   channels[j].tx_power_att = req_channels[i]->max_power;
   channels[j].channel = req_channels[i]->hw_value;

   if (n_pactive_ch &&
       (band == NL80211_BAND_2GHZ) &&
       (channels[j].channel >= 12) &&
       (channels[j].channel <= 14) &&
       (flags & IEEE80211_CHAN_NO_IR) &&
       !force_passive) {
    /* pactive channels treated as DFS */
    channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;

    /*
 * n_pactive_ch is counted down from the end of
 * the passive channel list
 */
    (*n_pactive_ch)++;
    wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
          *n_pactive_ch);
   }

   wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
         req_channels[i]->center_freq,
         req_channels[i]->hw_value,
         req_channels[i]->flags,
         req_channels[i]->max_power,
         min_dwell_time_active,
         max_dwell_time_active,
         flags & IEEE80211_CHAN_RADAR ?
     ", DFS" : "",
         flags & IEEE80211_CHAN_NO_IR ?
     ", NO-IR" : "");
   j++;
  }
 }

 return j - start;
}

bool
wlcore_set_scan_chan_params(struct wl1271 *wl,
       struct wlcore_scan_channels *cfg,
       struct ieee80211_channel *channels[],
       u32 n_channels,
       u32 n_ssids,
       int scan_type)
{
 u8 n_pactive_ch = 0;

 cfg->passive[0] =
  wlcore_scan_get_channels(wl,
      channels,
      n_channels,
      n_ssids,
      cfg->channels_2,
      NL80211_BAND_2GHZ,
      false, true, 0,
      MAX_CHANNELS_2GHZ,
      &n_pactive_ch,
      scan_type);
 cfg->active[0] =
  wlcore_scan_get_channels(wl,
      channels,
      n_channels,
      n_ssids,
      cfg->channels_2,
      NL80211_BAND_2GHZ,
      false, false,
      cfg->passive[0],
      MAX_CHANNELS_2GHZ,
      &n_pactive_ch,
      scan_type);
 cfg->passive[1] =
  wlcore_scan_get_channels(wl,
      channels,
      n_channels,
      n_ssids,
      cfg->channels_5,
      NL80211_BAND_5GHZ,
      false, true, 0,
      wl->max_channels_5,
      &n_pactive_ch,
      scan_type);
 cfg->dfs =
  wlcore_scan_get_channels(wl,
      channels,
      n_channels,
      n_ssids,
      cfg->channels_5,
      NL80211_BAND_5GHZ,
      true, true,
      cfg->passive[1],
      wl->max_channels_5,
      &n_pactive_ch,
      scan_type);
 cfg->active[1] =
  wlcore_scan_get_channels(wl,
      channels,
      n_channels,
      n_ssids,
      cfg->channels_5,
      NL80211_BAND_5GHZ,
      false, false,
      cfg->passive[1] + cfg->dfs,
      wl->max_channels_5,
      &n_pactive_ch,
      scan_type);

 /* 802.11j channels are not supported yet */
 cfg->passive[2] = 0;
 cfg->active[2] = 0;

 cfg->passive_active = n_pactive_ch;

 wl1271_debug(DEBUG_SCAN, " 2.4GHz: active %d passive %d",
       cfg->active[0], cfg->passive[0]);
 wl1271_debug(DEBUG_SCAN, " 5GHz: active %d passive %d",
       cfg->active[1], cfg->passive[1]);
 wl1271_debug(DEBUG_SCAN, " DFS: %d", cfg->dfs);

 return  cfg->passive[0] || cfg->active[0] ||
  cfg->passive[1] || cfg->active[1] || cfg->dfs ||
  cfg->passive[2] || cfg->active[2];
}
EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);

int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
  const u8 *ssid, size_t ssid_len,
  struct cfg80211_scan_request *req)
{
 struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);

 /*
 * cfg80211 should guarantee that we don't get more channels
 * than what we have registered.
 */
 BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);

 if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
  return -EBUSY;

 wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;

 if (ssid_len && ssid) {
  wl->scan.ssid_len = ssid_len;
  memcpy(wl->scan.ssid, ssid, ssid_len);
 } else {
  wl->scan.ssid_len = 0;
 }

 wl->scan_wlvif = wlvif;
 wl->scan.req = req;
 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));

 /* we assume failure so that timeout scenarios are handled correctly */
 wl->scan.failed = true;
 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
         msecs_to_jiffies(WL1271_SCAN_TIMEOUT));

 wl->ops->scan_start(wl, wlvif, req);

 return 0;
}
/* Returns the scan type to be used or a negative value on error */
int
wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
     struct wl12xx_vif *wlvif,
     struct cfg80211_sched_scan_request *req)
{
 struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 struct cfg80211_match_set *sets = req->match_sets;
 struct cfg80211_ssid *ssids = req->ssids;
 int ret = 0, type, i, j, n_match_ssids = 0;

 wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");

 /* count the match sets that contain SSIDs */
 for (i = 0; i < req->n_match_sets; i++)
  if (sets[i].ssid.ssid_len > 0)
   n_match_ssids++;

 /* No filter, no ssids or only bcast ssid */
 if (!n_match_ssids &&
     (!req->n_ssids ||
      (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
  type = SCAN_SSID_FILTER_ANY;
  goto out;
 }

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

 cmd->role_id = wlvif->role_id;
 if (!n_match_ssids) {
  /* No filter, with ssids */
  type = SCAN_SSID_FILTER_DISABLED;

  for (i = 0; i < req->n_ssids; i++) {
   cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
    SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
   cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
   memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
          ssids[i].ssid_len);
   cmd->n_ssids++;
  }
 } else {
  type = SCAN_SSID_FILTER_LIST;

  /* Add all SSIDs from the filters */
  for (i = 0; i < req->n_match_sets; i++) {
   /* ignore sets without SSIDs */
   if (!sets[i].ssid.ssid_len)
    continue;

   cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
   cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
   memcpy(cmd->ssids[cmd->n_ssids].ssid,
          sets[i].ssid.ssid, sets[i].ssid.ssid_len);
   cmd->n_ssids++;
  }
  if ((req->n_ssids > 1) ||
      (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
   /*
 * Mark all the SSIDs passed in the SSID list as HIDDEN,
 * so they're used in probe requests.
 */
   for (i = 0; i < req->n_ssids; i++) {
    if (!req->ssids[i].ssid_len)
     continue;

    for (j = 0; j < cmd->n_ssids; j++)
     if ((req->ssids[i].ssid_len ==
          cmd->ssids[j].len) &&
         !memcmp(req->ssids[i].ssid,
         cmd->ssids[j].ssid,
         req->ssids[i].ssid_len)) {
      cmd->ssids[j].type =
       SCAN_SSID_TYPE_HIDDEN;
      break;
     }
    /* Fail if SSID isn't present in the filters */
    if (j == cmd->n_ssids) {
     ret = -EINVAL;
     goto out_free;
    }
   }
  }
 }

 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
         sizeof(*cmd), 0);
 if (ret < 0) {
  wl1271_error("cmd sched scan ssid list failed");
  goto out_free;
 }

out_free:
 kfree(cmd);
out:
 if (ret < 0)
  return ret;
 return type;
}
EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);

void wlcore_scan_sched_scan_results(struct wl1271 *wl)
{
 wl1271_debug(DEBUG_SCAN, "got periodic scan results");

 ieee80211_sched_scan_results(wl->hw);
}
EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);