mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:36:42 +07:00
76bed0f43b
In case of wide bandwidth (wider than 20MHz) used by IBSS, scan all channels in chandef to be able to find neighboring IBSS netwqworks that use the same overall channels but a different control channel. Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1212 lines
32 KiB
C
1212 lines
32 KiB
C
/*
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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 2013-2014 Intel Mobile Communications GmbH
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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 the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 <linux/pm_qos.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 <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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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 ieee802_11_elems *elems,
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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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struct cfg80211_bss *cbss;
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struct ieee80211_bss *bss;
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int clen, srlen;
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enum nl80211_bss_scan_width scan_width;
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s32 signal = 0;
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if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
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signal = rx_status->signal * 100;
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else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
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signal = (rx_status->signal * 100) / local->hw.max_signal;
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scan_width = NL80211_BSS_CHAN_WIDTH_20;
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if (rx_status->flag & RX_FLAG_5MHZ)
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scan_width = NL80211_BSS_CHAN_WIDTH_5;
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if (rx_status->flag & RX_FLAG_10MHZ)
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scan_width = NL80211_BSS_CHAN_WIDTH_10;
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cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel,
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scan_width, mgmt, len, signal,
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GFP_ATOMIC);
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if (!cbss)
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return NULL;
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bss = (void *)cbss->priv;
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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->flag & RX_FLAG_HT) &&
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!(rx_status->flag & RX_FLAG_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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return bss;
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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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u8 *elements;
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struct ieee80211_channel *channel;
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size_t baselen;
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struct ieee802_11_elems elems;
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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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scan_req = rcu_dereference(local->scan_req);
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sched_scan_req = rcu_dereference(local->sched_scan_req);
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/* ignore ProbeResp to foreign address unless scanning
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* with randomised address
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*/
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if (!(sdata1 &&
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(ether_addr_equal(mgmt->da, sdata1->vif.addr) ||
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scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) &&
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!(sdata2 &&
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(ether_addr_equal(mgmt->da, sdata2->vif.addr) ||
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sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)))
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return;
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elements = mgmt->u.probe_resp.variable;
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baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.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 > skb->len)
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return;
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ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
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channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
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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, &elems,
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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_local *local)
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{
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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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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 (local->hw.flags & IEEE80211_SINGLE_HW_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 == IEEE80211_NUM_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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ielen = ieee80211_build_preq_ies(local,
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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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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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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 = local->ops->hw_scan;
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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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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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if (hw_scan && !aborted &&
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!(local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) &&
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ieee80211_prep_hw_scan(local)) {
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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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}
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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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cfg80211_scan_done(scan_req, aborted);
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RCU_INIT_POINTER(local->scan_req, NULL);
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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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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. */
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ieee80211_hw_config(local, 0);
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if (!hw_scan) {
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ieee80211_configure_filter(local);
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drv_sw_scan_complete(local, scan_sdata);
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ieee80211_offchannel_return(local);
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}
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ieee80211_recalc_idle(local);
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ieee80211_mlme_notify_scan_completed(local);
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ieee80211_ibss_notify_scan_completed(local);
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ieee80211_mesh_notify_scan_completed(local);
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if (was_scanning)
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ieee80211_start_next_roc(local);
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}
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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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trace_api_scan_completed(local, aborted);
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set_bit(SCAN_COMPLETED, &local->scanning);
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if (aborted)
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set_bit(SCAN_ABORTED, &local->scanning);
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ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
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}
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EXPORT_SYMBOL(ieee80211_scan_completed);
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static int ieee80211_start_sw_scan(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata)
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{
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/* Software scan is not supported in multi-channel cases */
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if (local->use_chanctx)
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return -EOPNOTSUPP;
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/*
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* Hardware/driver doesn't support hw_scan, so use software
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* scanning instead. First send a nullfunc frame with power save
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* bit on so that AP will buffer the frames for us while we are not
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* listening, then send probe requests to each channel and wait for
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* the responses. After all channels are scanned, tune back to the
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* original channel and send a nullfunc frame with power save bit
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* off to trigger the AP to send us all the buffered frames.
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*
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* Note that while local->sw_scanning is true everything else but
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* nullfunc frames and probe requests will be dropped in
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* ieee80211_tx_h_check_assoc().
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*/
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drv_sw_scan_start(local, sdata, local->scan_addr);
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local->leave_oper_channel_time = jiffies;
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local->next_scan_state = SCAN_DECISION;
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local->scan_channel_idx = 0;
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ieee80211_offchannel_stop_vifs(local);
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/* ensure nullfunc is transmitted before leaving operating channel */
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ieee80211_flush_queues(local, NULL, false);
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ieee80211_configure_filter(local);
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/* We need to set power level at maximum rate for scanning. */
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ieee80211_hw_config(local, 0);
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ieee80211_queue_delayed_work(&local->hw,
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&local->scan_work, 0);
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return 0;
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}
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static bool ieee80211_can_scan(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata)
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{
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if (ieee80211_is_radar_required(local))
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return false;
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if (!list_empty(&local->roc_list))
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return false;
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if (sdata->vif.type == NL80211_IFTYPE_STATION &&
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sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
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return false;
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return true;
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}
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void ieee80211_run_deferred_scan(struct ieee80211_local *local)
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{
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lockdep_assert_held(&local->mtx);
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if (!local->scan_req || local->scanning)
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return;
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if (!ieee80211_can_scan(local,
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rcu_dereference_protected(
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local->scan_sdata,
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lockdep_is_held(&local->mtx))))
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return;
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ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
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round_jiffies_relative(0));
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}
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static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
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unsigned long *next_delay)
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{
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int i;
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struct ieee80211_sub_if_data *sdata;
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struct cfg80211_scan_request *scan_req;
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enum ieee80211_band band = local->hw.conf.chandef.chan->band;
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u32 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;
|
|
|
|
sdata = rcu_dereference_protected(local->scan_sdata,
|
|
lockdep_is_held(&local->mtx));
|
|
|
|
for (i = 0; i < scan_req->n_ssids; i++)
|
|
ieee80211_send_probe_req(
|
|
sdata, local->scan_addr, NULL,
|
|
scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
|
|
scan_req->ie, scan_req->ie_len,
|
|
scan_req->rates[band], false,
|
|
tx_flags, local->hw.conf.chandef.chan, true);
|
|
|
|
/*
|
|
* 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;
|
|
int rc;
|
|
|
|
lockdep_assert_held(&local->mtx);
|
|
|
|
if (local->scan_req || ieee80211_is_radar_required(local))
|
|
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;
|
|
}
|
|
|
|
if (local->ops->hw_scan) {
|
|
u8 *ies;
|
|
|
|
local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
|
|
|
|
if (local->hw.flags & IEEE80211_SINGLE_HW_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;
|
|
|
|
local->hw_scan_band = 0;
|
|
|
|
/*
|
|
* 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 (local->ops->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) ||
|
|
!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 (local->ops->hw_scan) {
|
|
WARN_ON(!ieee80211_prep_hw_scan(local));
|
|
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);
|
|
}
|
|
|
|
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)
|
|
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.center_freq2 = 0;
|
|
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;
|
|
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;
|
|
}
|
|
|
|
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 || !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 ieee80211_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 < IEEE80211_NUM_BANDS; band++) {
|
|
if (!local->hw.wiphy->bands[band])
|
|
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 */
|
|
__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[IEEE80211_NUM_BANDS] = {};
|
|
u8 bands_used = 0;
|
|
u8 *ie;
|
|
size_t len;
|
|
|
|
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 < IEEE80211_NUM_BANDS; i++) {
|
|
if (local->hw.wiphy->bands[i]) {
|
|
bands_used |= BIT(i);
|
|
rate_masks[i] = (u32) -1;
|
|
num_bands++;
|
|
}
|
|
}
|
|
|
|
ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
|
|
if (!ie) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
|
|
|
|
len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
|
|
&sched_scan_ies, req->ie,
|
|
req->ie_len, bands_used,
|
|
rate_masks, &chandef);
|
|
|
|
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_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
int ret = 0;
|
|
|
|
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);
|
|
|
|
if (rcu_access_pointer(local->sched_scan_sdata)) {
|
|
ret = drv_sched_scan_stop(local, 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);
|
|
}
|
|
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);
|
|
}
|
|
|
|
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);
|
|
|
|
schedule_work(&local->sched_scan_stopped_work);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
|