| /* |
| * Scanning implementation |
| * |
| * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| * Copyright 2004, Instant802 Networks, Inc. |
| * Copyright 2005, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/if_arp.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/pm_qos_params.h> |
| #include <net/sch_generic.h> |
| #include <linux/slab.h> |
| #include <net/mac80211.h> |
| |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "mesh.h" |
| |
| #define IEEE80211_PROBE_DELAY (HZ / 33) |
| #define IEEE80211_CHANNEL_TIME (HZ / 33) |
| #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
| |
| struct ieee80211_bss * |
| ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
| u8 *ssid, u8 ssid_len) |
| { |
| struct cfg80211_bss *cbss; |
| |
| cbss = cfg80211_get_bss(local->hw.wiphy, |
| ieee80211_get_channel(local->hw.wiphy, freq), |
| bssid, ssid, ssid_len, 0, 0); |
| if (!cbss) |
| return NULL; |
| return (void *)cbss->priv; |
| } |
| |
| static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
| { |
| struct ieee80211_bss *bss = (void *)cbss->priv; |
| |
| kfree(bss_mesh_id(bss)); |
| kfree(bss_mesh_cfg(bss)); |
| } |
| |
| void ieee80211_rx_bss_put(struct ieee80211_local *local, |
| struct ieee80211_bss *bss) |
| { |
| if (!bss) |
| return; |
| cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); |
| } |
| |
| static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
| { |
| u8 qos_info; |
| |
| if (elems->wmm_info && elems->wmm_info_len == 7 |
| && elems->wmm_info[5] == 1) |
| qos_info = elems->wmm_info[6]; |
| else if (elems->wmm_param && elems->wmm_param_len == 24 |
| && elems->wmm_param[5] == 1) |
| qos_info = elems->wmm_param[6]; |
| else |
| /* no valid wmm information or parameter element found */ |
| return false; |
| |
| return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; |
| } |
| |
| struct ieee80211_bss * |
| ieee80211_bss_info_update(struct ieee80211_local *local, |
| struct ieee80211_rx_status *rx_status, |
| struct ieee80211_mgmt *mgmt, |
| size_t len, |
| struct ieee802_11_elems *elems, |
| struct ieee80211_channel *channel, |
| bool beacon) |
| { |
| struct cfg80211_bss *cbss; |
| struct ieee80211_bss *bss; |
| int clen, srlen; |
| s32 signal = 0; |
| |
| if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
| signal = rx_status->signal * 100; |
| else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
| signal = (rx_status->signal * 100) / local->hw.max_signal; |
| |
| cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
| mgmt, len, signal, GFP_ATOMIC); |
| |
| if (!cbss) |
| return NULL; |
| |
| cbss->free_priv = ieee80211_rx_bss_free; |
| bss = (void *)cbss->priv; |
| |
| /* save the ERP value so that it is available at association time */ |
| if (elems->erp_info && elems->erp_info_len >= 1) { |
| bss->erp_value = elems->erp_info[0]; |
| bss->has_erp_value = 1; |
| } |
| |
| if (elems->tim) { |
| struct ieee80211_tim_ie *tim_ie = |
| (struct ieee80211_tim_ie *)elems->tim; |
| bss->dtim_period = tim_ie->dtim_period; |
| } |
| |
| /* replace old supported rates if we get new values */ |
| srlen = 0; |
| if (elems->supp_rates) { |
| clen = IEEE80211_MAX_SUPP_RATES; |
| if (clen > elems->supp_rates_len) |
| clen = elems->supp_rates_len; |
| memcpy(bss->supp_rates, elems->supp_rates, clen); |
| srlen += clen; |
| } |
| if (elems->ext_supp_rates) { |
| clen = IEEE80211_MAX_SUPP_RATES - srlen; |
| if (clen > elems->ext_supp_rates_len) |
| clen = elems->ext_supp_rates_len; |
| memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen); |
| srlen += clen; |
| } |
| if (srlen) |
| bss->supp_rates_len = srlen; |
| |
| bss->wmm_used = elems->wmm_param || elems->wmm_info; |
| bss->uapsd_supported = is_uapsd_supported(elems); |
| |
| if (!beacon) |
| bss->last_probe_resp = jiffies; |
| |
| return bss; |
| } |
| |
| ieee80211_rx_result |
| ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
| { |
| struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_mgmt *mgmt; |
| struct ieee80211_bss *bss; |
| u8 *elements; |
| struct ieee80211_channel *channel; |
| size_t baselen; |
| int freq; |
| __le16 fc; |
| bool presp, beacon = false; |
| struct ieee802_11_elems elems; |
| |
| if (skb->len < 2) |
| return RX_DROP_UNUSABLE; |
| |
| mgmt = (struct ieee80211_mgmt *) skb->data; |
| fc = mgmt->frame_control; |
| |
| if (ieee80211_is_ctl(fc)) |
| return RX_CONTINUE; |
| |
| if (skb->len < 24) |
| return RX_DROP_MONITOR; |
| |
| presp = ieee80211_is_probe_resp(fc); |
| if (presp) { |
| /* ignore ProbeResp to foreign address */ |
| if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
| return RX_DROP_MONITOR; |
| |
| presp = true; |
| elements = mgmt->u.probe_resp.variable; |
| baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); |
| } else { |
| beacon = ieee80211_is_beacon(fc); |
| baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
| elements = mgmt->u.beacon.variable; |
| } |
| |
| if (!presp && !beacon) |
| return RX_CONTINUE; |
| |
| if (baselen > skb->len) |
| return RX_DROP_MONITOR; |
| |
| ieee802_11_parse_elems(elements, skb->len - baselen, &elems); |
| |
| if (elems.ds_params && elems.ds_params_len == 1) |
| freq = ieee80211_channel_to_frequency(elems.ds_params[0]); |
| else |
| freq = rx_status->freq; |
| |
| channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); |
| |
| if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
| return RX_DROP_MONITOR; |
| |
| bss = ieee80211_bss_info_update(sdata->local, rx_status, |
| mgmt, skb->len, &elems, |
| channel, beacon); |
| if (bss) |
| ieee80211_rx_bss_put(sdata->local, bss); |
| |
| dev_kfree_skb(skb); |
| return RX_QUEUED; |
| } |
| |
| /* return false if no more work */ |
| static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) |
| { |
| struct cfg80211_scan_request *req = local->scan_req; |
| enum ieee80211_band band; |
| int i, ielen, n_chans; |
| |
| do { |
| if (local->hw_scan_band == IEEE80211_NUM_BANDS) |
| return false; |
| |
| band = local->hw_scan_band; |
| n_chans = 0; |
| for (i = 0; i < req->n_channels; i++) { |
| if (req->channels[i]->band == band) { |
| local->hw_scan_req->channels[n_chans] = |
| req->channels[i]; |
| n_chans++; |
| } |
| } |
| |
| local->hw_scan_band++; |
| } while (!n_chans); |
| |
| local->hw_scan_req->n_channels = n_chans; |
| |
| ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, |
| req->ie, req->ie_len, band); |
| local->hw_scan_req->ie_len = ielen; |
| |
| return true; |
| } |
| |
| void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| bool was_hw_scan; |
| |
| trace_api_scan_completed(local, aborted); |
| |
| mutex_lock(&local->scan_mtx); |
| |
| /* |
| * It's ok to abort a not-yet-running scan (that |
| * we have one at all will be verified by checking |
| * local->scan_req next), but not to complete it |
| * successfully. |
| */ |
| if (WARN_ON(!local->scanning && !aborted)) |
| aborted = true; |
| |
| if (WARN_ON(!local->scan_req)) { |
| mutex_unlock(&local->scan_mtx); |
| return; |
| } |
| |
| was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
| if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
| ieee80211_queue_delayed_work(&local->hw, |
| &local->scan_work, 0); |
| mutex_unlock(&local->scan_mtx); |
| return; |
| } |
| |
| kfree(local->hw_scan_req); |
| local->hw_scan_req = NULL; |
| |
| if (local->scan_req != local->int_scan_req) |
| cfg80211_scan_done(local->scan_req, aborted); |
| local->scan_req = NULL; |
| local->scan_sdata = NULL; |
| |
| local->scanning = 0; |
| local->scan_channel = NULL; |
| |
| drv_sw_scan_complete(local); |
| |
| /* we only have to protect scan_req and hw/sw scan */ |
| mutex_unlock(&local->scan_mtx); |
| |
| ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
| if (was_hw_scan) |
| goto done; |
| |
| ieee80211_configure_filter(local); |
| |
| ieee80211_offchannel_return(local, true); |
| |
| done: |
| ieee80211_recalc_idle(local); |
| ieee80211_mlme_notify_scan_completed(local); |
| ieee80211_ibss_notify_scan_completed(local); |
| ieee80211_mesh_notify_scan_completed(local); |
| ieee80211_queue_work(&local->hw, &local->work_work); |
| } |
| EXPORT_SYMBOL(ieee80211_scan_completed); |
| |
| static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
| { |
| /* |
| * 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); |
| |
| ieee80211_offchannel_stop_beaconing(local); |
| |
| local->leave_oper_channel_time = 0; |
| local->next_scan_state = SCAN_DECISION; |
| local->scan_channel_idx = 0; |
| |
| drv_flush(local, false); |
| |
| ieee80211_configure_filter(local); |
| |
| ieee80211_queue_delayed_work(&local->hw, |
| &local->scan_work, |
| IEEE80211_CHANNEL_TIME); |
| |
| return 0; |
| } |
| |
| |
| static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
| struct cfg80211_scan_request *req) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int rc; |
| |
| if (local->scan_req) |
| return -EBUSY; |
| |
| if (!list_empty(&local->work_list)) { |
| /* wait for the work to finish/time out */ |
| local->scan_req = req; |
| local->scan_sdata = sdata; |
| return 0; |
| } |
| |
| if (local->ops->hw_scan) { |
| u8 *ies; |
| |
| local->hw_scan_req = kmalloc( |
| sizeof(*local->hw_scan_req) + |
| req->n_channels * sizeof(req->channels[0]) + |
| 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + |
| req->ie_len, GFP_KERNEL); |
| if (!local->hw_scan_req) |
| return -ENOMEM; |
| |
| local->hw_scan_req->ssids = req->ssids; |
| local->hw_scan_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->ie = ies; |
| |
| 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. |
| */ |
| } |
| |
| local->scan_req = req; |
| local->scan_sdata = sdata; |
| |
| if (local->ops->hw_scan) |
| __set_bit(SCAN_HW_SCANNING, &local->scanning); |
| else |
| __set_bit(SCAN_SW_SCANNING, &local->scanning); |
| |
| /* |
| * Kicking off the scan need not be protected, |
| * only the scan variable stuff, since now |
| * local->scan_req is assigned and other callers |
| * will abort their scan attempts. |
| * |
| * This avoids too many locking dependencies |
| * so that the scan completed calls have more |
| * locking freedom. |
| */ |
| |
| ieee80211_recalc_idle(local); |
| mutex_unlock(&local->scan_mtx); |
| |
| 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); |
| |
| mutex_lock(&local->scan_mtx); |
| |
| if (rc) { |
| kfree(local->hw_scan_req); |
| local->hw_scan_req = NULL; |
| local->scanning = 0; |
| |
| ieee80211_recalc_idle(local); |
| |
| local->scan_req = NULL; |
| 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_PASSIVE_SCAN) |
| return IEEE80211_PASSIVE_CHANNEL_TIME; |
| return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; |
| } |
| |
| static int ieee80211_scan_state_decision(struct ieee80211_local *local, |
| unsigned long *next_delay) |
| { |
| bool associated = false; |
| bool tx_empty = true; |
| bool bad_latency; |
| bool listen_int_exceeded; |
| unsigned long min_beacon_int = 0; |
| struct ieee80211_sub_if_data *sdata; |
| struct ieee80211_channel *next_chan; |
| |
| /* if no more bands/channels left, complete scan and advance to the idle state */ |
| if (local->scan_channel_idx >= local->scan_req->n_channels) { |
| ieee80211_scan_completed(&local->hw, false); |
| return 1; |
| } |
| |
| /* |
| * 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 (sdata->vif.bss_conf.beacon_int < |
| min_beacon_int || min_beacon_int == 0) |
| min_beacon_int = |
| sdata->vif.bss_conf.beacon_int; |
| |
| if (!qdisc_all_tx_empty(sdata->dev)) { |
| tx_empty = false; |
| break; |
| } |
| } |
| } |
| } |
| mutex_unlock(&local->iflist_mtx); |
| |
| if (local->scan_channel) { |
| /* |
| * we're currently scanning a different channel, let's |
| * see if we can scan another channel without interfering |
| * with the current traffic situation. |
| * |
| * Since we don't know if the AP has pending frames for us |
| * we can only check for our tx queues and use the current |
| * pm_qos requirements for rx. Hence, if no tx traffic occurs |
| * at all we will scan as many channels in a row as the pm_qos |
| * latency allows us to. Additionally we also check for the |
| * currently negotiated listen interval to prevent losing |
| * frames unnecessarily. |
| * |
| * Otherwise switch back to the operating channel. |
| */ |
| next_chan = local->scan_req->channels[local->scan_channel_idx]; |
| |
| bad_latency = time_after(jiffies + |
| ieee80211_scan_get_channel_time(next_chan), |
| local->leave_oper_channel_time + |
| usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); |
| |
| listen_int_exceeded = time_after(jiffies + |
| ieee80211_scan_get_channel_time(next_chan), |
| local->leave_oper_channel_time + |
| usecs_to_jiffies(min_beacon_int * 1024) * |
| local->hw.conf.listen_interval); |
| |
| if (associated && ( !tx_empty || bad_latency || |
| listen_int_exceeded)) |
| local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; |
| else |
| local->next_scan_state = SCAN_SET_CHANNEL; |
| } else { |
| /* |
| * we're on the operating channel currently, let's |
| * leave that channel now to scan another one |
| */ |
| local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; |
| } |
| |
| *next_delay = 0; |
| return 0; |
| } |
| |
| static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, |
| unsigned long *next_delay) |
| { |
| ieee80211_offchannel_stop_station(local); |
| |
| __set_bit(SCAN_OFF_CHANNEL, &local->scanning); |
| |
| /* |
| * What if the nullfunc frames didn't arrive? |
| */ |
| drv_flush(local, false); |
| if (local->ops->flush) |
| *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; |
| } |
| |
| static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, |
| unsigned long *next_delay) |
| { |
| /* switch back to the operating channel */ |
| local->scan_channel = NULL; |
| ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
| |
| /* |
| * Only re-enable station mode interface now; beaconing will be |
| * re-enabled once the full scan has been completed. |
| */ |
| ieee80211_offchannel_return(local, false); |
| |
| __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); |
| |
| *next_delay = HZ / 5; |
| local->next_scan_state = SCAN_DECISION; |
| } |
| |
| static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
| unsigned long *next_delay) |
| { |
| int skip; |
| struct ieee80211_channel *chan; |
| |
| skip = 0; |
| chan = local->scan_req->channels[local->scan_channel_idx]; |
| |
| local->scan_channel = chan; |
| 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_PASSIVE_SCAN || |
| !local->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_send_probe(struct ieee80211_local *local, |
| unsigned long *next_delay) |
| { |
| int i; |
| struct ieee80211_sub_if_data *sdata = local->scan_sdata; |
| |
| for (i = 0; i < local->scan_req->n_ssids; i++) |
| ieee80211_send_probe_req( |
| sdata, NULL, |
| local->scan_req->ssids[i].ssid, |
| local->scan_req->ssids[i].ssid_len, |
| local->scan_req->ie, local->scan_req->ie_len); |
| |
| /* |
| * After sending probe requests, wait for probe responses |
| * on the channel. |
| */ |
| *next_delay = IEEE80211_CHANNEL_TIME; |
| local->next_scan_state = SCAN_DECISION; |
| } |
| |
| 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 = local->scan_sdata; |
| unsigned long next_delay = 0; |
| |
| mutex_lock(&local->scan_mtx); |
| if (!sdata || !local->scan_req) { |
| mutex_unlock(&local->scan_mtx); |
| return; |
| } |
| |
| if (local->hw_scan_req) { |
| int rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
| mutex_unlock(&local->scan_mtx); |
| if (rc) |
| ieee80211_scan_completed(&local->hw, true); |
| return; |
| } |
| |
| if (local->scan_req && !local->scanning) { |
| struct cfg80211_scan_request *req = local->scan_req; |
| int rc; |
| |
| local->scan_req = NULL; |
| local->scan_sdata = NULL; |
| |
| rc = __ieee80211_start_scan(sdata, req); |
| mutex_unlock(&local->scan_mtx); |
| |
| if (rc) |
| ieee80211_scan_completed(&local->hw, true); |
| return; |
| } |
| |
| mutex_unlock(&local->scan_mtx); |
| |
| /* |
| * Avoid re-scheduling when the sdata is going away. |
| */ |
| if (!ieee80211_sdata_running(sdata)) { |
| ieee80211_scan_completed(&local->hw, true); |
| return; |
| } |
| |
| /* |
| * as long as no delay is required advance immediately |
| * without scheduling a new work |
| */ |
| do { |
| switch (local->next_scan_state) { |
| case SCAN_DECISION: |
| if (ieee80211_scan_state_decision(local, &next_delay)) |
| return; |
| 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_LEAVE_OPER_CHANNEL: |
| ieee80211_scan_state_leave_oper_channel(local, &next_delay); |
| break; |
| case SCAN_ENTER_OPER_CHANNEL: |
| ieee80211_scan_state_enter_oper_channel(local, &next_delay); |
| break; |
| } |
| } while (next_delay == 0); |
| |
| ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
| } |
| |
| int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
| struct cfg80211_scan_request *req) |
| { |
| int res; |
| |
| mutex_lock(&sdata->local->scan_mtx); |
| res = __ieee80211_start_scan(sdata, req); |
| mutex_unlock(&sdata->local->scan_mtx); |
| |
| return res; |
| } |
| |
| int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
| const u8 *ssid, u8 ssid_len, |
| struct ieee80211_channel *chan) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int ret = -EBUSY; |
| enum ieee80211_band band; |
| |
| mutex_lock(&local->scan_mtx); |
| |
| /* busy scanning */ |
| if (local->scan_req) |
| goto unlock; |
| |
| /* fill internal scan request */ |
| if (!chan) { |
| int i, nchan = 0; |
| |
| for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| if (!local->hw.wiphy->bands[band]) |
| continue; |
| for (i = 0; |
| i < local->hw.wiphy->bands[band]->n_channels; |
| i++) { |
| local->int_scan_req->channels[nchan] = |
| &local->hw.wiphy->bands[band]->channels[i]; |
| nchan++; |
| } |
| } |
| |
| local->int_scan_req->n_channels = nchan; |
| } else { |
| local->int_scan_req->channels[0] = chan; |
| local->int_scan_req->n_channels = 1; |
| } |
| |
| local->int_scan_req->ssids = &local->scan_ssid; |
| local->int_scan_req->n_ssids = 1; |
| 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->scan_mtx); |
| return ret; |
| } |
| |
| void ieee80211_scan_cancel(struct ieee80211_local *local) |
| { |
| bool abortscan; |
| |
| cancel_delayed_work_sync(&local->scan_work); |
| |
| /* |
| * Only call this function when a scan can't be |
| * queued -- mostly at suspend under RTNL. |
| */ |
| mutex_lock(&local->scan_mtx); |
| abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || |
| (!local->scanning && local->scan_req); |
| mutex_unlock(&local->scan_mtx); |
| |
| if (abortscan) |
| ieee80211_scan_completed(&local->hw, true); |
| } |