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![Thomas Pedersen](/assets/img/avatar_default.png)
This commit finds the correct offset for Information Elements in S1G beacon frames so they can be reported in scan results. Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com> Link: https://lore.kernel.org/r/20200922022818.15855-8-thomas@adapt-ip.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1433 lines
38 KiB
C
1433 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Scanning implementation
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2013-2015 Intel Mobile Communications GmbH
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* Copyright 2016-2017 Intel Deutschland GmbH
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* Copyright (C) 2018-2020 Intel Corporation
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*/
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/sch_generic.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/random.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "mesh.h"
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#define IEEE80211_PROBE_DELAY (HZ / 33)
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#define IEEE80211_CHANNEL_TIME (HZ / 33)
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#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
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void ieee80211_rx_bss_put(struct ieee80211_local *local,
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struct ieee80211_bss *bss)
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{
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if (!bss)
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return;
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cfg80211_put_bss(local->hw.wiphy,
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container_of((void *)bss, struct cfg80211_bss, priv));
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}
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static bool is_uapsd_supported(struct ieee802_11_elems *elems)
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{
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u8 qos_info;
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if (elems->wmm_info && elems->wmm_info_len == 7
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&& elems->wmm_info[5] == 1)
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qos_info = elems->wmm_info[6];
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else if (elems->wmm_param && elems->wmm_param_len == 24
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&& elems->wmm_param[5] == 1)
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qos_info = elems->wmm_param[6];
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else
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/* no valid wmm information or parameter element found */
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return false;
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return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
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}
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static void
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ieee80211_update_bss_from_elems(struct ieee80211_local *local,
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struct ieee80211_bss *bss,
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struct ieee802_11_elems *elems,
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struct ieee80211_rx_status *rx_status,
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bool beacon)
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{
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int clen, srlen;
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if (beacon)
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bss->device_ts_beacon = rx_status->device_timestamp;
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else
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bss->device_ts_presp = rx_status->device_timestamp;
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if (elems->parse_error) {
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if (beacon)
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bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
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else
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bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
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} else {
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if (beacon)
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bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
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else
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bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
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}
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/* save the ERP value so that it is available at association time */
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if (elems->erp_info && (!elems->parse_error ||
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!(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
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bss->erp_value = elems->erp_info[0];
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bss->has_erp_value = true;
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if (!elems->parse_error)
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bss->valid_data |= IEEE80211_BSS_VALID_ERP;
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}
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/* replace old supported rates if we get new values */
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if (!elems->parse_error ||
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!(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
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srlen = 0;
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if (elems->supp_rates) {
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clen = IEEE80211_MAX_SUPP_RATES;
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if (clen > elems->supp_rates_len)
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clen = elems->supp_rates_len;
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memcpy(bss->supp_rates, elems->supp_rates, clen);
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srlen += clen;
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}
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if (elems->ext_supp_rates) {
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clen = IEEE80211_MAX_SUPP_RATES - srlen;
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if (clen > elems->ext_supp_rates_len)
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clen = elems->ext_supp_rates_len;
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memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
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clen);
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srlen += clen;
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}
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if (srlen) {
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bss->supp_rates_len = srlen;
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if (!elems->parse_error)
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bss->valid_data |= IEEE80211_BSS_VALID_RATES;
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}
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}
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if (!elems->parse_error ||
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!(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
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bss->wmm_used = elems->wmm_param || elems->wmm_info;
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bss->uapsd_supported = is_uapsd_supported(elems);
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if (!elems->parse_error)
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bss->valid_data |= IEEE80211_BSS_VALID_WMM;
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}
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if (beacon) {
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struct ieee80211_supported_band *sband =
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local->hw.wiphy->bands[rx_status->band];
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if (!(rx_status->encoding == RX_ENC_HT) &&
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!(rx_status->encoding == RX_ENC_VHT))
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bss->beacon_rate =
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&sband->bitrates[rx_status->rate_idx];
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}
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if (elems->vht_cap_elem)
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bss->vht_cap_info =
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le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
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else
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bss->vht_cap_info = 0;
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}
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struct ieee80211_bss *
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ieee80211_bss_info_update(struct ieee80211_local *local,
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struct ieee80211_rx_status *rx_status,
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struct ieee80211_mgmt *mgmt, size_t len,
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struct ieee80211_channel *channel)
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{
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bool beacon = ieee80211_is_beacon(mgmt->frame_control) ||
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ieee80211_is_s1g_beacon(mgmt->frame_control);
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struct cfg80211_bss *cbss, *non_tx_cbss;
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struct ieee80211_bss *bss, *non_tx_bss;
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struct cfg80211_inform_bss bss_meta = {
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.boottime_ns = rx_status->boottime_ns,
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};
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bool signal_valid;
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struct ieee80211_sub_if_data *scan_sdata;
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struct ieee802_11_elems elems;
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size_t baselen;
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u8 *elements;
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if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
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bss_meta.signal = 0; /* invalid signal indication */
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else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
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bss_meta.signal = rx_status->signal * 100;
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else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
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bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
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bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
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if (rx_status->bw == RATE_INFO_BW_5)
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bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
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else if (rx_status->bw == RATE_INFO_BW_10)
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bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
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bss_meta.chan = channel;
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rcu_read_lock();
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scan_sdata = rcu_dereference(local->scan_sdata);
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if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
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scan_sdata->vif.bss_conf.assoc &&
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ieee80211_have_rx_timestamp(rx_status)) {
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bss_meta.parent_tsf =
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ieee80211_calculate_rx_timestamp(local, rx_status,
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len + FCS_LEN, 24);
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ether_addr_copy(bss_meta.parent_bssid,
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scan_sdata->vif.bss_conf.bssid);
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}
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rcu_read_unlock();
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cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
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mgmt, len, GFP_ATOMIC);
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if (!cbss)
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return NULL;
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if (ieee80211_is_probe_resp(mgmt->frame_control)) {
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elements = mgmt->u.probe_resp.variable;
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baselen = offsetof(struct ieee80211_mgmt,
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u.probe_resp.variable);
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} else if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
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struct ieee80211_ext *ext = (void *) mgmt;
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baselen = offsetof(struct ieee80211_ext, u.s1g_beacon.variable);
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elements = ext->u.s1g_beacon.variable;
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} else {
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baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
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elements = mgmt->u.beacon.variable;
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}
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if (baselen > len)
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return NULL;
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ieee802_11_parse_elems(elements, len - baselen, false, &elems,
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mgmt->bssid, cbss->bssid);
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/* In case the signal is invalid update the status */
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signal_valid = channel == cbss->channel;
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if (!signal_valid)
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rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
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bss = (void *)cbss->priv;
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ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon);
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list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) {
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non_tx_bss = (void *)non_tx_cbss->priv;
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ieee80211_update_bss_from_elems(local, non_tx_bss, &elems,
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rx_status, beacon);
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}
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return bss;
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}
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static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
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u32 scan_flags, const u8 *da)
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{
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if (!sdata)
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return false;
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/* accept broadcast for OCE */
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if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
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is_broadcast_ether_addr(da))
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return true;
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if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
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return true;
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return ether_addr_equal(da, sdata->vif.addr);
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}
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void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
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{
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struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
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struct ieee80211_sub_if_data *sdata1, *sdata2;
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struct ieee80211_mgmt *mgmt = (void *)skb->data;
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struct ieee80211_bss *bss;
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struct ieee80211_channel *channel;
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if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
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if (skb->len < 15)
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return;
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} else if (skb->len < 24 ||
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(!ieee80211_is_probe_resp(mgmt->frame_control) &&
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!ieee80211_is_beacon(mgmt->frame_control)))
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return;
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sdata1 = rcu_dereference(local->scan_sdata);
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sdata2 = rcu_dereference(local->sched_scan_sdata);
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if (likely(!sdata1 && !sdata2))
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return;
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if (ieee80211_is_probe_resp(mgmt->frame_control)) {
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struct cfg80211_scan_request *scan_req;
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struct cfg80211_sched_scan_request *sched_scan_req;
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u32 scan_req_flags = 0, sched_scan_req_flags = 0;
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scan_req = rcu_dereference(local->scan_req);
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sched_scan_req = rcu_dereference(local->sched_scan_req);
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if (scan_req)
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scan_req_flags = scan_req->flags;
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if (sched_scan_req)
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sched_scan_req_flags = sched_scan_req->flags;
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/* ignore ProbeResp to foreign address or non-bcast (OCE)
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* unless scanning with randomised address
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*/
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if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
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mgmt->da) &&
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!ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
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mgmt->da))
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return;
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}
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channel = ieee80211_get_channel_khz(local->hw.wiphy,
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ieee80211_rx_status_to_khz(rx_status));
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if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
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return;
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bss = ieee80211_bss_info_update(local, rx_status,
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mgmt, skb->len,
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channel);
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if (bss)
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ieee80211_rx_bss_put(local, bss);
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}
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static void
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ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
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enum nl80211_bss_scan_width scan_width)
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{
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memset(chandef, 0, sizeof(*chandef));
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switch (scan_width) {
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case NL80211_BSS_CHAN_WIDTH_5:
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chandef->width = NL80211_CHAN_WIDTH_5;
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break;
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case NL80211_BSS_CHAN_WIDTH_10:
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chandef->width = NL80211_CHAN_WIDTH_10;
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break;
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default:
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chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
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break;
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}
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}
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/* return false if no more work */
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static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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struct cfg80211_scan_request *req;
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struct cfg80211_chan_def chandef;
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u8 bands_used = 0;
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int i, ielen, n_chans;
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u32 flags = 0;
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req = rcu_dereference_protected(local->scan_req,
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lockdep_is_held(&local->mtx));
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if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
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return false;
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if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
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for (i = 0; i < req->n_channels; i++) {
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local->hw_scan_req->req.channels[i] = req->channels[i];
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bands_used |= BIT(req->channels[i]->band);
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}
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n_chans = req->n_channels;
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} else {
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do {
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if (local->hw_scan_band == NUM_NL80211_BANDS)
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return false;
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n_chans = 0;
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for (i = 0; i < req->n_channels; i++) {
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if (req->channels[i]->band !=
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local->hw_scan_band)
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continue;
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local->hw_scan_req->req.channels[n_chans] =
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req->channels[i];
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n_chans++;
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bands_used |= BIT(req->channels[i]->band);
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}
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local->hw_scan_band++;
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} while (!n_chans);
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}
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local->hw_scan_req->req.n_channels = n_chans;
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ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
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if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
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flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
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ielen = ieee80211_build_preq_ies(sdata,
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(u8 *)local->hw_scan_req->req.ie,
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local->hw_scan_ies_bufsize,
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&local->hw_scan_req->ies,
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req->ie, req->ie_len,
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bands_used, req->rates, &chandef,
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flags);
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local->hw_scan_req->req.ie_len = ielen;
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local->hw_scan_req->req.no_cck = req->no_cck;
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ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
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ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
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req->mac_addr_mask);
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ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
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return true;
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}
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static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
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bool was_scanning = local->scanning;
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struct cfg80211_scan_request *scan_req;
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struct ieee80211_sub_if_data *scan_sdata;
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struct ieee80211_sub_if_data *sdata;
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lockdep_assert_held(&local->mtx);
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/*
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* It's ok to abort a not-yet-running scan (that
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* we have one at all will be verified by checking
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* local->scan_req next), but not to complete it
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* successfully.
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*/
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if (WARN_ON(!local->scanning && !aborted))
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aborted = true;
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if (WARN_ON(!local->scan_req))
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return;
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scan_sdata = rcu_dereference_protected(local->scan_sdata,
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lockdep_is_held(&local->mtx));
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if (hw_scan && !aborted &&
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!ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
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ieee80211_prep_hw_scan(scan_sdata)) {
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int rc;
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rc = drv_hw_scan(local,
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rcu_dereference_protected(local->scan_sdata,
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lockdep_is_held(&local->mtx)),
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local->hw_scan_req);
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if (rc == 0)
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return;
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/* HW scan failed and is going to be reported as aborted,
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* so clear old scan info.
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*/
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memset(&local->scan_info, 0, sizeof(local->scan_info));
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aborted = true;
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}
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kfree(local->hw_scan_req);
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local->hw_scan_req = NULL;
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scan_req = rcu_dereference_protected(local->scan_req,
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lockdep_is_held(&local->mtx));
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if (scan_req != local->int_scan_req) {
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local->scan_info.aborted = aborted;
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cfg80211_scan_done(scan_req, &local->scan_info);
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}
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RCU_INIT_POINTER(local->scan_req, NULL);
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RCU_INIT_POINTER(local->scan_sdata, NULL);
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local->scanning = 0;
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local->scan_chandef.chan = NULL;
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/* Set power back to normal operating levels. */
|
|
ieee80211_hw_config(local, 0);
|
|
|
|
if (!hw_scan) {
|
|
ieee80211_configure_filter(local);
|
|
drv_sw_scan_complete(local, scan_sdata);
|
|
ieee80211_offchannel_return(local);
|
|
}
|
|
|
|
ieee80211_recalc_idle(local);
|
|
|
|
ieee80211_mlme_notify_scan_completed(local);
|
|
ieee80211_ibss_notify_scan_completed(local);
|
|
|
|
/* Requeue all the work that might have been ignored while
|
|
* the scan was in progress; if there was none this will
|
|
* just be a no-op for the particular interface.
|
|
*/
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
|
if (ieee80211_sdata_running(sdata))
|
|
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
|
|
}
|
|
|
|
if (was_scanning)
|
|
ieee80211_start_next_roc(local);
|
|
}
|
|
|
|
void ieee80211_scan_completed(struct ieee80211_hw *hw,
|
|
struct cfg80211_scan_info *info)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
trace_api_scan_completed(local, info->aborted);
|
|
|
|
set_bit(SCAN_COMPLETED, &local->scanning);
|
|
if (info->aborted)
|
|
set_bit(SCAN_ABORTED, &local->scanning);
|
|
|
|
memcpy(&local->scan_info, info, sizeof(*info));
|
|
|
|
ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_scan_completed);
|
|
|
|
static int ieee80211_start_sw_scan(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
/* Software scan is not supported in multi-channel cases */
|
|
if (local->use_chanctx)
|
|
return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* Hardware/driver doesn't support hw_scan, so use software
|
|
* scanning instead. First send a nullfunc frame with power save
|
|
* bit on so that AP will buffer the frames for us while we are not
|
|
* listening, then send probe requests to each channel and wait for
|
|
* the responses. After all channels are scanned, tune back to the
|
|
* original channel and send a nullfunc frame with power save bit
|
|
* off to trigger the AP to send us all the buffered frames.
|
|
*
|
|
* Note that while local->sw_scanning is true everything else but
|
|
* nullfunc frames and probe requests will be dropped in
|
|
* ieee80211_tx_h_check_assoc().
|
|
*/
|
|
drv_sw_scan_start(local, sdata, local->scan_addr);
|
|
|
|
local->leave_oper_channel_time = jiffies;
|
|
local->next_scan_state = SCAN_DECISION;
|
|
local->scan_channel_idx = 0;
|
|
|
|
ieee80211_offchannel_stop_vifs(local);
|
|
|
|
/* ensure nullfunc is transmitted before leaving operating channel */
|
|
ieee80211_flush_queues(local, NULL, false);
|
|
|
|
ieee80211_configure_filter(local);
|
|
|
|
/* We need to set power level at maximum rate for scanning. */
|
|
ieee80211_hw_config(local, 0);
|
|
|
|
ieee80211_queue_delayed_work(&local->hw,
|
|
&local->scan_work, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_sub_if_data *sdata_iter;
|
|
|
|
if (!ieee80211_is_radar_required(local))
|
|
return true;
|
|
|
|
if (!regulatory_pre_cac_allowed(local->hw.wiphy))
|
|
return false;
|
|
|
|
mutex_lock(&local->iflist_mtx);
|
|
list_for_each_entry(sdata_iter, &local->interfaces, list) {
|
|
if (sdata_iter->wdev.cac_started) {
|
|
mutex_unlock(&local->iflist_mtx);
|
|
return false;
|
|
}
|
|
}
|
|
mutex_unlock(&local->iflist_mtx);
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool ieee80211_can_scan(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
if (!__ieee80211_can_leave_ch(sdata))
|
|
return false;
|
|
|
|
if (!list_empty(&local->roc_list))
|
|
return false;
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
|
|
sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void ieee80211_run_deferred_scan(struct ieee80211_local *local)
|
|
{
|
|
lockdep_assert_held(&local->mtx);
|
|
|
|
if (!local->scan_req || local->scanning)
|
|
return;
|
|
|
|
if (!ieee80211_can_scan(local,
|
|
rcu_dereference_protected(
|
|
local->scan_sdata,
|
|
lockdep_is_held(&local->mtx))))
|
|
return;
|
|
|
|
ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
|
|
round_jiffies_relative(0));
|
|
}
|
|
|
|
static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *src, const u8 *dst,
|
|
const u8 *ssid, size_t ssid_len,
|
|
const u8 *ie, size_t ie_len,
|
|
u32 ratemask, u32 flags, u32 tx_flags,
|
|
struct ieee80211_channel *channel)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
|
|
ssid, ssid_len,
|
|
ie, ie_len, flags);
|
|
|
|
if (skb) {
|
|
if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
|
|
struct ieee80211_hdr *hdr = (void *)skb->data;
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
u16 sn = get_random_u32();
|
|
|
|
info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
|
|
hdr->seq_ctrl =
|
|
cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
|
|
}
|
|
IEEE80211_SKB_CB(skb)->flags |= tx_flags;
|
|
ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
|
|
}
|
|
}
|
|
|
|
static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
|
|
unsigned long *next_delay)
|
|
{
|
|
int i;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct cfg80211_scan_request *scan_req;
|
|
enum nl80211_band band = local->hw.conf.chandef.chan->band;
|
|
u32 flags = 0, tx_flags;
|
|
|
|
scan_req = rcu_dereference_protected(local->scan_req,
|
|
lockdep_is_held(&local->mtx));
|
|
|
|
tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
|
|
if (scan_req->no_cck)
|
|
tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
|
|
if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
|
|
flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
|
|
if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
|
|
flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
|
|
|
|
sdata = rcu_dereference_protected(local->scan_sdata,
|
|
lockdep_is_held(&local->mtx));
|
|
|
|
for (i = 0; i < scan_req->n_ssids; i++)
|
|
ieee80211_send_scan_probe_req(
|
|
sdata, local->scan_addr, scan_req->bssid,
|
|
scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
|
|
scan_req->ie, scan_req->ie_len,
|
|
scan_req->rates[band], flags,
|
|
tx_flags, local->hw.conf.chandef.chan);
|
|
|
|
/*
|
|
* After sending probe requests, wait for probe responses
|
|
* on the channel.
|
|
*/
|
|
*next_delay = IEEE80211_CHANNEL_TIME;
|
|
local->next_scan_state = SCAN_DECISION;
|
|
}
|
|
|
|
static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
|
|
struct cfg80211_scan_request *req)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
bool hw_scan = local->ops->hw_scan;
|
|
int rc;
|
|
|
|
lockdep_assert_held(&local->mtx);
|
|
|
|
if (local->scan_req)
|
|
return -EBUSY;
|
|
|
|
if (!__ieee80211_can_leave_ch(sdata))
|
|
return -EBUSY;
|
|
|
|
if (!ieee80211_can_scan(local, sdata)) {
|
|
/* wait for the work to finish/time out */
|
|
rcu_assign_pointer(local->scan_req, req);
|
|
rcu_assign_pointer(local->scan_sdata, sdata);
|
|
return 0;
|
|
}
|
|
|
|
again:
|
|
if (hw_scan) {
|
|
u8 *ies;
|
|
|
|
local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
|
|
|
|
if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
|
|
int i, n_bands = 0;
|
|
u8 bands_counted = 0;
|
|
|
|
for (i = 0; i < req->n_channels; i++) {
|
|
if (bands_counted & BIT(req->channels[i]->band))
|
|
continue;
|
|
bands_counted |= BIT(req->channels[i]->band);
|
|
n_bands++;
|
|
}
|
|
|
|
local->hw_scan_ies_bufsize *= n_bands;
|
|
}
|
|
|
|
local->hw_scan_req = kmalloc(
|
|
sizeof(*local->hw_scan_req) +
|
|
req->n_channels * sizeof(req->channels[0]) +
|
|
local->hw_scan_ies_bufsize, GFP_KERNEL);
|
|
if (!local->hw_scan_req)
|
|
return -ENOMEM;
|
|
|
|
local->hw_scan_req->req.ssids = req->ssids;
|
|
local->hw_scan_req->req.n_ssids = req->n_ssids;
|
|
ies = (u8 *)local->hw_scan_req +
|
|
sizeof(*local->hw_scan_req) +
|
|
req->n_channels * sizeof(req->channels[0]);
|
|
local->hw_scan_req->req.ie = ies;
|
|
local->hw_scan_req->req.flags = req->flags;
|
|
eth_broadcast_addr(local->hw_scan_req->req.bssid);
|
|
local->hw_scan_req->req.duration = req->duration;
|
|
local->hw_scan_req->req.duration_mandatory =
|
|
req->duration_mandatory;
|
|
|
|
local->hw_scan_band = 0;
|
|
local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
|
|
local->hw_scan_req->req.scan_6ghz_params =
|
|
req->scan_6ghz_params;
|
|
local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
|
|
|
|
/*
|
|
* After allocating local->hw_scan_req, we must
|
|
* go through until ieee80211_prep_hw_scan(), so
|
|
* anything that might be changed here and leave
|
|
* this function early must not go after this
|
|
* allocation.
|
|
*/
|
|
}
|
|
|
|
rcu_assign_pointer(local->scan_req, req);
|
|
rcu_assign_pointer(local->scan_sdata, sdata);
|
|
|
|
if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
|
|
get_random_mask_addr(local->scan_addr,
|
|
req->mac_addr,
|
|
req->mac_addr_mask);
|
|
else
|
|
memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
|
|
|
|
if (hw_scan) {
|
|
__set_bit(SCAN_HW_SCANNING, &local->scanning);
|
|
} else if ((req->n_channels == 1) &&
|
|
(req->channels[0] == local->_oper_chandef.chan)) {
|
|
/*
|
|
* If we are scanning only on the operating channel
|
|
* then we do not need to stop normal activities
|
|
*/
|
|
unsigned long next_delay;
|
|
|
|
__set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
|
|
|
|
ieee80211_recalc_idle(local);
|
|
|
|
/* Notify driver scan is starting, keep order of operations
|
|
* same as normal software scan, in case that matters. */
|
|
drv_sw_scan_start(local, sdata, local->scan_addr);
|
|
|
|
ieee80211_configure_filter(local); /* accept probe-responses */
|
|
|
|
/* We need to ensure power level is at max for scanning. */
|
|
ieee80211_hw_config(local, 0);
|
|
|
|
if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
|
|
IEEE80211_CHAN_RADAR)) ||
|
|
!req->n_ssids) {
|
|
next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
|
|
} else {
|
|
ieee80211_scan_state_send_probe(local, &next_delay);
|
|
next_delay = IEEE80211_CHANNEL_TIME;
|
|
}
|
|
|
|
/* Now, just wait a bit and we are all done! */
|
|
ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
|
|
next_delay);
|
|
return 0;
|
|
} else {
|
|
/* Do normal software scan */
|
|
__set_bit(SCAN_SW_SCANNING, &local->scanning);
|
|
}
|
|
|
|
ieee80211_recalc_idle(local);
|
|
|
|
if (hw_scan) {
|
|
WARN_ON(!ieee80211_prep_hw_scan(sdata));
|
|
rc = drv_hw_scan(local, sdata, local->hw_scan_req);
|
|
} else {
|
|
rc = ieee80211_start_sw_scan(local, sdata);
|
|
}
|
|
|
|
if (rc) {
|
|
kfree(local->hw_scan_req);
|
|
local->hw_scan_req = NULL;
|
|
local->scanning = 0;
|
|
|
|
ieee80211_recalc_idle(local);
|
|
|
|
local->scan_req = NULL;
|
|
RCU_INIT_POINTER(local->scan_sdata, NULL);
|
|
}
|
|
|
|
if (hw_scan && rc == 1) {
|
|
/*
|
|
* we can't fall back to software for P2P-GO
|
|
* as it must update NoA etc.
|
|
*/
|
|
if (ieee80211_vif_type_p2p(&sdata->vif) ==
|
|
NL80211_IFTYPE_P2P_GO)
|
|
return -EOPNOTSUPP;
|
|
hw_scan = false;
|
|
goto again;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static unsigned long
|
|
ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
|
|
{
|
|
/*
|
|
* TODO: channel switching also consumes quite some time,
|
|
* add that delay as well to get a better estimation
|
|
*/
|
|
if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
|
|
return IEEE80211_PASSIVE_CHANNEL_TIME;
|
|
return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
|
|
}
|
|
|
|
static void ieee80211_scan_state_decision(struct ieee80211_local *local,
|
|
unsigned long *next_delay)
|
|
{
|
|
bool associated = false;
|
|
bool tx_empty = true;
|
|
bool bad_latency;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct ieee80211_channel *next_chan;
|
|
enum mac80211_scan_state next_scan_state;
|
|
struct cfg80211_scan_request *scan_req;
|
|
|
|
/*
|
|
* check if at least one STA interface is associated,
|
|
* check if at least one STA interface has pending tx frames
|
|
* and grab the lowest used beacon interval
|
|
*/
|
|
mutex_lock(&local->iflist_mtx);
|
|
list_for_each_entry(sdata, &local->interfaces, list) {
|
|
if (!ieee80211_sdata_running(sdata))
|
|
continue;
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
|
|
if (sdata->u.mgd.associated) {
|
|
associated = true;
|
|
|
|
if (!qdisc_all_tx_empty(sdata->dev)) {
|
|
tx_empty = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
mutex_unlock(&local->iflist_mtx);
|
|
|
|
scan_req = rcu_dereference_protected(local->scan_req,
|
|
lockdep_is_held(&local->mtx));
|
|
|
|
next_chan = scan_req->channels[local->scan_channel_idx];
|
|
|
|
/*
|
|
* we're currently scanning a different channel, let's
|
|
* see if we can scan another channel without interfering
|
|
* with the current traffic situation.
|
|
*
|
|
* Keep good latency, do not stay off-channel more than 125 ms.
|
|
*/
|
|
|
|
bad_latency = time_after(jiffies +
|
|
ieee80211_scan_get_channel_time(next_chan),
|
|
local->leave_oper_channel_time + HZ / 8);
|
|
|
|
if (associated && !tx_empty) {
|
|
if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
|
|
next_scan_state = SCAN_ABORT;
|
|
else
|
|
next_scan_state = SCAN_SUSPEND;
|
|
} else if (associated && bad_latency) {
|
|
next_scan_state = SCAN_SUSPEND;
|
|
} else {
|
|
next_scan_state = SCAN_SET_CHANNEL;
|
|
}
|
|
|
|
local->next_scan_state = next_scan_state;
|
|
|
|
*next_delay = 0;
|
|
}
|
|
|
|
static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
|
|
unsigned long *next_delay)
|
|
{
|
|
int skip;
|
|
struct ieee80211_channel *chan;
|
|
enum nl80211_bss_scan_width oper_scan_width;
|
|
struct cfg80211_scan_request *scan_req;
|
|
|
|
scan_req = rcu_dereference_protected(local->scan_req,
|
|
lockdep_is_held(&local->mtx));
|
|
|
|
skip = 0;
|
|
chan = scan_req->channels[local->scan_channel_idx];
|
|
|
|
local->scan_chandef.chan = chan;
|
|
local->scan_chandef.center_freq1 = chan->center_freq;
|
|
local->scan_chandef.freq1_offset = chan->freq_offset;
|
|
local->scan_chandef.center_freq2 = 0;
|
|
|
|
/* For scanning on the S1G band, ignore scan_width (which is constant
|
|
* across all channels) for now since channel width is specific to each
|
|
* channel. Detect the required channel width here and likely revisit
|
|
* later. Maybe scan_width could be used to build the channel scan list?
|
|
*/
|
|
if (chan->band == NL80211_BAND_S1GHZ) {
|
|
local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
|
|
goto set_channel;
|
|
}
|
|
|
|
switch (scan_req->scan_width) {
|
|
case NL80211_BSS_CHAN_WIDTH_5:
|
|
local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
|
|
break;
|
|
case NL80211_BSS_CHAN_WIDTH_10:
|
|
local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
|
|
break;
|
|
default:
|
|
case NL80211_BSS_CHAN_WIDTH_20:
|
|
/* If scanning on oper channel, use whatever channel-type
|
|
* is currently in use.
|
|
*/
|
|
oper_scan_width = cfg80211_chandef_to_scan_width(
|
|
&local->_oper_chandef);
|
|
if (chan == local->_oper_chandef.chan &&
|
|
oper_scan_width == scan_req->scan_width)
|
|
local->scan_chandef = local->_oper_chandef;
|
|
else
|
|
local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
|
|
break;
|
|
case NL80211_BSS_CHAN_WIDTH_1:
|
|
case NL80211_BSS_CHAN_WIDTH_2:
|
|
/* shouldn't get here, S1G handled above */
|
|
WARN_ON(1);
|
|
break;
|
|
}
|
|
|
|
set_channel:
|
|
if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
|
|
skip = 1;
|
|
|
|
/* advance state machine to next channel/band */
|
|
local->scan_channel_idx++;
|
|
|
|
if (skip) {
|
|
/* if we skip this channel return to the decision state */
|
|
local->next_scan_state = SCAN_DECISION;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Probe delay is used to update the NAV, cf. 11.1.3.2.2
|
|
* (which unfortunately doesn't say _why_ step a) is done,
|
|
* but it waits for the probe delay or until a frame is
|
|
* received - and the received frame would update the NAV).
|
|
* For now, we do not support waiting until a frame is
|
|
* received.
|
|
*
|
|
* In any case, it is not necessary for a passive scan.
|
|
*/
|
|
if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
|
|
!scan_req->n_ssids) {
|
|
*next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
|
|
local->next_scan_state = SCAN_DECISION;
|
|
return;
|
|
}
|
|
|
|
/* active scan, send probes */
|
|
*next_delay = IEEE80211_PROBE_DELAY;
|
|
local->next_scan_state = SCAN_SEND_PROBE;
|
|
}
|
|
|
|
static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
|
|
unsigned long *next_delay)
|
|
{
|
|
/* switch back to the operating channel */
|
|
local->scan_chandef.chan = NULL;
|
|
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
|
|
|
|
/* disable PS */
|
|
ieee80211_offchannel_return(local);
|
|
|
|
*next_delay = HZ / 5;
|
|
/* afterwards, resume scan & go to next channel */
|
|
local->next_scan_state = SCAN_RESUME;
|
|
}
|
|
|
|
static void ieee80211_scan_state_resume(struct ieee80211_local *local,
|
|
unsigned long *next_delay)
|
|
{
|
|
ieee80211_offchannel_stop_vifs(local);
|
|
|
|
if (local->ops->flush) {
|
|
ieee80211_flush_queues(local, NULL, false);
|
|
*next_delay = 0;
|
|
} else
|
|
*next_delay = HZ / 10;
|
|
|
|
/* remember when we left the operating channel */
|
|
local->leave_oper_channel_time = jiffies;
|
|
|
|
/* advance to the next channel to be scanned */
|
|
local->next_scan_state = SCAN_SET_CHANNEL;
|
|
}
|
|
|
|
void ieee80211_scan_work(struct work_struct *work)
|
|
{
|
|
struct ieee80211_local *local =
|
|
container_of(work, struct ieee80211_local, scan_work.work);
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct cfg80211_scan_request *scan_req;
|
|
unsigned long next_delay = 0;
|
|
bool aborted;
|
|
|
|
mutex_lock(&local->mtx);
|
|
|
|
if (!ieee80211_can_run_worker(local)) {
|
|
aborted = true;
|
|
goto out_complete;
|
|
}
|
|
|
|
sdata = rcu_dereference_protected(local->scan_sdata,
|
|
lockdep_is_held(&local->mtx));
|
|
scan_req = rcu_dereference_protected(local->scan_req,
|
|
lockdep_is_held(&local->mtx));
|
|
|
|
/* When scanning on-channel, the first-callback means completed. */
|
|
if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
|
|
aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
|
|
goto out_complete;
|
|
}
|
|
|
|
if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
|
|
aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
|
|
goto out_complete;
|
|
}
|
|
|
|
if (!sdata || !scan_req)
|
|
goto out;
|
|
|
|
if (!local->scanning) {
|
|
int rc;
|
|
|
|
RCU_INIT_POINTER(local->scan_req, NULL);
|
|
RCU_INIT_POINTER(local->scan_sdata, NULL);
|
|
|
|
rc = __ieee80211_start_scan(sdata, scan_req);
|
|
if (rc) {
|
|
/* need to complete scan in cfg80211 */
|
|
rcu_assign_pointer(local->scan_req, scan_req);
|
|
aborted = true;
|
|
goto out_complete;
|
|
} else
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* as long as no delay is required advance immediately
|
|
* without scheduling a new work
|
|
*/
|
|
do {
|
|
if (!ieee80211_sdata_running(sdata)) {
|
|
aborted = true;
|
|
goto out_complete;
|
|
}
|
|
|
|
switch (local->next_scan_state) {
|
|
case SCAN_DECISION:
|
|
/* if no more bands/channels left, complete scan */
|
|
if (local->scan_channel_idx >= scan_req->n_channels) {
|
|
aborted = false;
|
|
goto out_complete;
|
|
}
|
|
ieee80211_scan_state_decision(local, &next_delay);
|
|
break;
|
|
case SCAN_SET_CHANNEL:
|
|
ieee80211_scan_state_set_channel(local, &next_delay);
|
|
break;
|
|
case SCAN_SEND_PROBE:
|
|
ieee80211_scan_state_send_probe(local, &next_delay);
|
|
break;
|
|
case SCAN_SUSPEND:
|
|
ieee80211_scan_state_suspend(local, &next_delay);
|
|
break;
|
|
case SCAN_RESUME:
|
|
ieee80211_scan_state_resume(local, &next_delay);
|
|
break;
|
|
case SCAN_ABORT:
|
|
aborted = true;
|
|
goto out_complete;
|
|
}
|
|
} while (next_delay == 0);
|
|
|
|
ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
|
|
goto out;
|
|
|
|
out_complete:
|
|
__ieee80211_scan_completed(&local->hw, aborted);
|
|
out:
|
|
mutex_unlock(&local->mtx);
|
|
}
|
|
|
|
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
|
|
struct cfg80211_scan_request *req)
|
|
{
|
|
int res;
|
|
|
|
mutex_lock(&sdata->local->mtx);
|
|
res = __ieee80211_start_scan(sdata, req);
|
|
mutex_unlock(&sdata->local->mtx);
|
|
|
|
return res;
|
|
}
|
|
|
|
int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *ssid, u8 ssid_len,
|
|
struct ieee80211_channel **channels,
|
|
unsigned int n_channels,
|
|
enum nl80211_bss_scan_width scan_width)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
int ret = -EBUSY, i, n_ch = 0;
|
|
enum nl80211_band band;
|
|
|
|
mutex_lock(&local->mtx);
|
|
|
|
/* busy scanning */
|
|
if (local->scan_req)
|
|
goto unlock;
|
|
|
|
/* fill internal scan request */
|
|
if (!channels) {
|
|
int max_n;
|
|
|
|
for (band = 0; band < NUM_NL80211_BANDS; band++) {
|
|
if (!local->hw.wiphy->bands[band] ||
|
|
band == NL80211_BAND_6GHZ)
|
|
continue;
|
|
|
|
max_n = local->hw.wiphy->bands[band]->n_channels;
|
|
for (i = 0; i < max_n; i++) {
|
|
struct ieee80211_channel *tmp_ch =
|
|
&local->hw.wiphy->bands[band]->channels[i];
|
|
|
|
if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
|
|
IEEE80211_CHAN_DISABLED))
|
|
continue;
|
|
|
|
local->int_scan_req->channels[n_ch] = tmp_ch;
|
|
n_ch++;
|
|
}
|
|
}
|
|
|
|
if (WARN_ON_ONCE(n_ch == 0))
|
|
goto unlock;
|
|
|
|
local->int_scan_req->n_channels = n_ch;
|
|
} else {
|
|
for (i = 0; i < n_channels; i++) {
|
|
if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
|
|
IEEE80211_CHAN_DISABLED))
|
|
continue;
|
|
|
|
local->int_scan_req->channels[n_ch] = channels[i];
|
|
n_ch++;
|
|
}
|
|
|
|
if (WARN_ON_ONCE(n_ch == 0))
|
|
goto unlock;
|
|
|
|
local->int_scan_req->n_channels = n_ch;
|
|
}
|
|
|
|
local->int_scan_req->ssids = &local->scan_ssid;
|
|
local->int_scan_req->n_ssids = 1;
|
|
local->int_scan_req->scan_width = scan_width;
|
|
memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
|
|
local->int_scan_req->ssids[0].ssid_len = ssid_len;
|
|
|
|
ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
|
|
unlock:
|
|
mutex_unlock(&local->mtx);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Only call this function when a scan can't be queued -- under RTNL.
|
|
*/
|
|
void ieee80211_scan_cancel(struct ieee80211_local *local)
|
|
{
|
|
/*
|
|
* We are canceling software scan, or deferred scan that was not
|
|
* yet really started (see __ieee80211_start_scan ).
|
|
*
|
|
* Regarding hardware scan:
|
|
* - we can not call __ieee80211_scan_completed() as when
|
|
* SCAN_HW_SCANNING bit is set this function change
|
|
* local->hw_scan_req to operate on 5G band, what race with
|
|
* driver which can use local->hw_scan_req
|
|
*
|
|
* - we can not cancel scan_work since driver can schedule it
|
|
* by ieee80211_scan_completed(..., true) to finish scan
|
|
*
|
|
* Hence we only call the cancel_hw_scan() callback, but the low-level
|
|
* driver is still responsible for calling ieee80211_scan_completed()
|
|
* after the scan was completed/aborted.
|
|
*/
|
|
|
|
mutex_lock(&local->mtx);
|
|
if (!local->scan_req)
|
|
goto out;
|
|
|
|
/*
|
|
* We have a scan running and the driver already reported completion,
|
|
* but the worker hasn't run yet or is stuck on the mutex - mark it as
|
|
* cancelled.
|
|
*/
|
|
if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
|
|
test_bit(SCAN_COMPLETED, &local->scanning)) {
|
|
set_bit(SCAN_HW_CANCELLED, &local->scanning);
|
|
goto out;
|
|
}
|
|
|
|
if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
|
|
/*
|
|
* Make sure that __ieee80211_scan_completed doesn't trigger a
|
|
* scan on another band.
|
|
*/
|
|
set_bit(SCAN_HW_CANCELLED, &local->scanning);
|
|
if (local->ops->cancel_hw_scan)
|
|
drv_cancel_hw_scan(local,
|
|
rcu_dereference_protected(local->scan_sdata,
|
|
lockdep_is_held(&local->mtx)));
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If the work is currently running, it must be blocked on
|
|
* the mutex, but we'll set scan_sdata = NULL and it'll
|
|
* simply exit once it acquires the mutex.
|
|
*/
|
|
cancel_delayed_work(&local->scan_work);
|
|
/* and clean up */
|
|
memset(&local->scan_info, 0, sizeof(local->scan_info));
|
|
__ieee80211_scan_completed(&local->hw, true);
|
|
out:
|
|
mutex_unlock(&local->mtx);
|
|
}
|
|
|
|
int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
|
|
struct cfg80211_sched_scan_request *req)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_scan_ies sched_scan_ies = {};
|
|
struct cfg80211_chan_def chandef;
|
|
int ret, i, iebufsz, num_bands = 0;
|
|
u32 rate_masks[NUM_NL80211_BANDS] = {};
|
|
u8 bands_used = 0;
|
|
u8 *ie;
|
|
u32 flags = 0;
|
|
|
|
iebufsz = local->scan_ies_len + req->ie_len;
|
|
|
|
lockdep_assert_held(&local->mtx);
|
|
|
|
if (!local->ops->sched_scan_start)
|
|
return -ENOTSUPP;
|
|
|
|
for (i = 0; i < NUM_NL80211_BANDS; i++) {
|
|
if (local->hw.wiphy->bands[i]) {
|
|
bands_used |= BIT(i);
|
|
rate_masks[i] = (u32) -1;
|
|
num_bands++;
|
|
}
|
|
}
|
|
|
|
if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
|
|
flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
|
|
|
|
ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
|
|
if (!ie) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
|
|
|
|
ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz,
|
|
&sched_scan_ies, req->ie,
|
|
req->ie_len, bands_used, rate_masks, &chandef,
|
|
flags);
|
|
|
|
ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
|
|
if (ret == 0) {
|
|
rcu_assign_pointer(local->sched_scan_sdata, sdata);
|
|
rcu_assign_pointer(local->sched_scan_req, req);
|
|
}
|
|
|
|
kfree(ie);
|
|
|
|
out:
|
|
if (ret) {
|
|
/* Clean in case of failure after HW restart or upon resume. */
|
|
RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
|
|
RCU_INIT_POINTER(local->sched_scan_req, NULL);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
|
|
struct cfg80211_sched_scan_request *req)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
int ret;
|
|
|
|
mutex_lock(&local->mtx);
|
|
|
|
if (rcu_access_pointer(local->sched_scan_sdata)) {
|
|
mutex_unlock(&local->mtx);
|
|
return -EBUSY;
|
|
}
|
|
|
|
ret = __ieee80211_request_sched_scan_start(sdata, req);
|
|
|
|
mutex_unlock(&local->mtx);
|
|
return ret;
|
|
}
|
|
|
|
int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
|
|
{
|
|
struct ieee80211_sub_if_data *sched_scan_sdata;
|
|
int ret = -ENOENT;
|
|
|
|
mutex_lock(&local->mtx);
|
|
|
|
if (!local->ops->sched_scan_stop) {
|
|
ret = -ENOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
/* We don't want to restart sched scan anymore. */
|
|
RCU_INIT_POINTER(local->sched_scan_req, NULL);
|
|
|
|
sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
|
|
lockdep_is_held(&local->mtx));
|
|
if (sched_scan_sdata) {
|
|
ret = drv_sched_scan_stop(local, sched_scan_sdata);
|
|
if (!ret)
|
|
RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
|
|
}
|
|
out:
|
|
mutex_unlock(&local->mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
trace_api_sched_scan_results(local);
|
|
|
|
cfg80211_sched_scan_results(hw->wiphy, 0);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sched_scan_results);
|
|
|
|
void ieee80211_sched_scan_end(struct ieee80211_local *local)
|
|
{
|
|
mutex_lock(&local->mtx);
|
|
|
|
if (!rcu_access_pointer(local->sched_scan_sdata)) {
|
|
mutex_unlock(&local->mtx);
|
|
return;
|
|
}
|
|
|
|
RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
|
|
|
|
/* If sched scan was aborted by the driver. */
|
|
RCU_INIT_POINTER(local->sched_scan_req, NULL);
|
|
|
|
mutex_unlock(&local->mtx);
|
|
|
|
cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
|
|
}
|
|
|
|
void ieee80211_sched_scan_stopped_work(struct work_struct *work)
|
|
{
|
|
struct ieee80211_local *local =
|
|
container_of(work, struct ieee80211_local,
|
|
sched_scan_stopped_work);
|
|
|
|
ieee80211_sched_scan_end(local);
|
|
}
|
|
|
|
void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
trace_api_sched_scan_stopped(local);
|
|
|
|
/*
|
|
* this shouldn't really happen, so for simplicity
|
|
* simply ignore it, and let mac80211 reconfigure
|
|
* the sched scan later on.
|
|
*/
|
|
if (local->in_reconfig)
|
|
return;
|
|
|
|
schedule_work(&local->sched_scan_stopped_work);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
|