10a51b27eSJohannes Berg /* 25484e237SJohannes Berg * Scanning implementation 35484e237SJohannes Berg * 40a51b27eSJohannes Berg * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 50a51b27eSJohannes Berg * Copyright 2004, Instant802 Networks, Inc. 60a51b27eSJohannes Berg * Copyright 2005, Devicescape Software, Inc. 70a51b27eSJohannes Berg * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 80a51b27eSJohannes Berg * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 90a51b27eSJohannes Berg * 100a51b27eSJohannes Berg * This program is free software; you can redistribute it and/or modify 110a51b27eSJohannes Berg * it under the terms of the GNU General Public License version 2 as 120a51b27eSJohannes Berg * published by the Free Software Foundation. 130a51b27eSJohannes Berg */ 140a51b27eSJohannes Berg 150a51b27eSJohannes Berg #include <linux/if_arp.h> 16*888d04dfSFelix Fietkau #include <linux/etherdevice.h> 17078e1e60SJohannes Berg #include <linux/rtnetlink.h> 18e8db0be1SJean Pihet #include <linux/pm_qos.h> 19df13cce5SHelmut Schaa #include <net/sch_generic.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 21bc3b2d7fSPaul Gortmaker #include <linux/export.h> 220a51b27eSJohannes Berg #include <net/mac80211.h> 230a51b27eSJohannes Berg 240a51b27eSJohannes Berg #include "ieee80211_i.h" 2524487981SJohannes Berg #include "driver-ops.h" 265484e237SJohannes Berg #include "mesh.h" 270a51b27eSJohannes Berg 280a51b27eSJohannes Berg #define IEEE80211_PROBE_DELAY (HZ / 33) 290a51b27eSJohannes Berg #define IEEE80211_CHANNEL_TIME (HZ / 33) 3096f7e739SHelmut Schaa #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) 310a51b27eSJohannes Berg 32c2b13452SJohannes Berg struct ieee80211_bss * 335484e237SJohannes Berg ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, 345484e237SJohannes Berg u8 *ssid, u8 ssid_len) 355484e237SJohannes Berg { 360c1ad2caSJohannes Berg struct cfg80211_bss *cbss; 370c1ad2caSJohannes Berg 380c1ad2caSJohannes Berg cbss = cfg80211_get_bss(local->hw.wiphy, 390c1ad2caSJohannes Berg ieee80211_get_channel(local->hw.wiphy, freq), 400c1ad2caSJohannes Berg bssid, ssid, ssid_len, 0, 0); 410c1ad2caSJohannes Berg if (!cbss) 420c1ad2caSJohannes Berg return NULL; 430c1ad2caSJohannes Berg return (void *)cbss->priv; 445484e237SJohannes Berg } 455484e237SJohannes Berg 4600d3f14cSJohannes Berg static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) 475484e237SJohannes Berg { 480c1ad2caSJohannes Berg struct ieee80211_bss *bss = (void *)cbss->priv; 495484e237SJohannes Berg 505484e237SJohannes Berg kfree(bss_mesh_id(bss)); 515484e237SJohannes Berg kfree(bss_mesh_cfg(bss)); 525484e237SJohannes Berg } 535484e237SJohannes Berg 545484e237SJohannes Berg void ieee80211_rx_bss_put(struct ieee80211_local *local, 55c2b13452SJohannes Berg struct ieee80211_bss *bss) 565484e237SJohannes Berg { 570c1ad2caSJohannes Berg if (!bss) 580c1ad2caSJohannes Berg return; 590c1ad2caSJohannes Berg cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); 605484e237SJohannes Berg } 615484e237SJohannes Berg 62ab13315aSKalle Valo static bool is_uapsd_supported(struct ieee802_11_elems *elems) 63ab13315aSKalle Valo { 64ab13315aSKalle Valo u8 qos_info; 65ab13315aSKalle Valo 66ab13315aSKalle Valo if (elems->wmm_info && elems->wmm_info_len == 7 67ab13315aSKalle Valo && elems->wmm_info[5] == 1) 68ab13315aSKalle Valo qos_info = elems->wmm_info[6]; 69ab13315aSKalle Valo else if (elems->wmm_param && elems->wmm_param_len == 24 70ab13315aSKalle Valo && elems->wmm_param[5] == 1) 71ab13315aSKalle Valo qos_info = elems->wmm_param[6]; 72ab13315aSKalle Valo else 73ab13315aSKalle Valo /* no valid wmm information or parameter element found */ 74ab13315aSKalle Valo return false; 75ab13315aSKalle Valo 76ab13315aSKalle Valo return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 77ab13315aSKalle Valo } 78ab13315aSKalle Valo 79c2b13452SJohannes Berg struct ieee80211_bss * 805484e237SJohannes Berg ieee80211_bss_info_update(struct ieee80211_local *local, 815484e237SJohannes Berg struct ieee80211_rx_status *rx_status, 825484e237SJohannes Berg struct ieee80211_mgmt *mgmt, 835484e237SJohannes Berg size_t len, 845484e237SJohannes Berg struct ieee802_11_elems *elems, 852a519311SJohannes Berg struct ieee80211_channel *channel, 862a519311SJohannes Berg bool beacon) 875484e237SJohannes Berg { 880c1ad2caSJohannes Berg struct cfg80211_bss *cbss; 89c2b13452SJohannes Berg struct ieee80211_bss *bss; 90f0b058b6SStanislaw Gruszka int clen, srlen; 912a519311SJohannes Berg s32 signal = 0; 922a519311SJohannes Berg 9377965c97SJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 942a519311SJohannes Berg signal = rx_status->signal * 100; 9577965c97SJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 962a519311SJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 972a519311SJohannes Berg 980c1ad2caSJohannes Berg cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, 9977965c97SJohannes Berg mgmt, len, signal, GFP_ATOMIC); 1005484e237SJohannes Berg 1010c1ad2caSJohannes Berg if (!cbss) 1025484e237SJohannes Berg return NULL; 10300d3f14cSJohannes Berg 1040c1ad2caSJohannes Berg cbss->free_priv = ieee80211_rx_bss_free; 1050c1ad2caSJohannes Berg bss = (void *)cbss->priv; 1065484e237SJohannes Berg 1075484e237SJohannes Berg /* save the ERP value so that it is available at association time */ 1085484e237SJohannes Berg if (elems->erp_info && elems->erp_info_len >= 1) { 1095484e237SJohannes Berg bss->erp_value = elems->erp_info[0]; 1103db1cd5cSRusty Russell bss->has_erp_value = true; 1115484e237SJohannes Berg } 1125484e237SJohannes Berg 1135484e237SJohannes Berg if (elems->tim) { 1145484e237SJohannes Berg struct ieee80211_tim_ie *tim_ie = 1155484e237SJohannes Berg (struct ieee80211_tim_ie *)elems->tim; 1165484e237SJohannes Berg bss->dtim_period = tim_ie->dtim_period; 1175484e237SJohannes Berg } 1185484e237SJohannes Berg 119e5b900d2SJohannes Berg /* If the beacon had no TIM IE, or it was invalid, use 1 */ 120e5b900d2SJohannes Berg if (beacon && !bss->dtim_period) 121e5b900d2SJohannes Berg bss->dtim_period = 1; 122e5b900d2SJohannes Berg 123f0b058b6SStanislaw Gruszka /* replace old supported rates if we get new values */ 124f0b058b6SStanislaw Gruszka srlen = 0; 1255484e237SJohannes Berg if (elems->supp_rates) { 126f0b058b6SStanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES; 1275484e237SJohannes Berg if (clen > elems->supp_rates_len) 1285484e237SJohannes Berg clen = elems->supp_rates_len; 129f0b058b6SStanislaw Gruszka memcpy(bss->supp_rates, elems->supp_rates, clen); 130f0b058b6SStanislaw Gruszka srlen += clen; 1315484e237SJohannes Berg } 1325484e237SJohannes Berg if (elems->ext_supp_rates) { 133f0b058b6SStanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES - srlen; 1345484e237SJohannes Berg if (clen > elems->ext_supp_rates_len) 1355484e237SJohannes Berg clen = elems->ext_supp_rates_len; 136f0b058b6SStanislaw Gruszka memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen); 137f0b058b6SStanislaw Gruszka srlen += clen; 1385484e237SJohannes Berg } 139f0b058b6SStanislaw Gruszka if (srlen) 140f0b058b6SStanislaw Gruszka bss->supp_rates_len = srlen; 1415484e237SJohannes Berg 1425484e237SJohannes Berg bss->wmm_used = elems->wmm_param || elems->wmm_info; 143ab13315aSKalle Valo bss->uapsd_supported = is_uapsd_supported(elems); 1445484e237SJohannes Berg 1455484e237SJohannes Berg if (!beacon) 1465484e237SJohannes Berg bss->last_probe_resp = jiffies; 1475484e237SJohannes Berg 1485484e237SJohannes Berg return bss; 1495484e237SJohannes Berg } 1500a51b27eSJohannes Berg 15198c8fccfSJohannes Berg ieee80211_rx_result 152f1d58c25SJohannes Berg ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 15398c8fccfSJohannes Berg { 154f1d58c25SJohannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 15598c8fccfSJohannes Berg struct ieee80211_mgmt *mgmt; 156c2b13452SJohannes Berg struct ieee80211_bss *bss; 15798c8fccfSJohannes Berg u8 *elements; 15898c8fccfSJohannes Berg struct ieee80211_channel *channel; 15998c8fccfSJohannes Berg size_t baselen; 16098c8fccfSJohannes Berg int freq; 16198c8fccfSJohannes Berg __le16 fc; 16298c8fccfSJohannes Berg bool presp, beacon = false; 16398c8fccfSJohannes Berg struct ieee802_11_elems elems; 16498c8fccfSJohannes Berg 16598c8fccfSJohannes Berg if (skb->len < 2) 16698c8fccfSJohannes Berg return RX_DROP_UNUSABLE; 16798c8fccfSJohannes Berg 16898c8fccfSJohannes Berg mgmt = (struct ieee80211_mgmt *) skb->data; 16998c8fccfSJohannes Berg fc = mgmt->frame_control; 17098c8fccfSJohannes Berg 17198c8fccfSJohannes Berg if (ieee80211_is_ctl(fc)) 17298c8fccfSJohannes Berg return RX_CONTINUE; 17398c8fccfSJohannes Berg 17498c8fccfSJohannes Berg if (skb->len < 24) 175306fe938SLuciano Coelho return RX_CONTINUE; 17698c8fccfSJohannes Berg 17798c8fccfSJohannes Berg presp = ieee80211_is_probe_resp(fc); 17898c8fccfSJohannes Berg if (presp) { 17998c8fccfSJohannes Berg /* ignore ProbeResp to foreign address */ 180*888d04dfSFelix Fietkau if (compare_ether_addr(mgmt->da, sdata->vif.addr)) 18198c8fccfSJohannes Berg return RX_DROP_MONITOR; 18298c8fccfSJohannes Berg 18398c8fccfSJohannes Berg presp = true; 18498c8fccfSJohannes Berg elements = mgmt->u.probe_resp.variable; 18598c8fccfSJohannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 18698c8fccfSJohannes Berg } else { 18798c8fccfSJohannes Berg beacon = ieee80211_is_beacon(fc); 18898c8fccfSJohannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 18998c8fccfSJohannes Berg elements = mgmt->u.beacon.variable; 19098c8fccfSJohannes Berg } 19198c8fccfSJohannes Berg 19298c8fccfSJohannes Berg if (!presp && !beacon) 19398c8fccfSJohannes Berg return RX_CONTINUE; 19498c8fccfSJohannes Berg 19598c8fccfSJohannes Berg if (baselen > skb->len) 19698c8fccfSJohannes Berg return RX_DROP_MONITOR; 19798c8fccfSJohannes Berg 19898c8fccfSJohannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 19998c8fccfSJohannes Berg 20098c8fccfSJohannes Berg if (elems.ds_params && elems.ds_params_len == 1) 20159eb21a6SBruno Randolf freq = ieee80211_channel_to_frequency(elems.ds_params[0], 20259eb21a6SBruno Randolf rx_status->band); 20398c8fccfSJohannes Berg else 20498c8fccfSJohannes Berg freq = rx_status->freq; 20598c8fccfSJohannes Berg 20698c8fccfSJohannes Berg channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 20798c8fccfSJohannes Berg 20898c8fccfSJohannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 20998c8fccfSJohannes Berg return RX_DROP_MONITOR; 21098c8fccfSJohannes Berg 21198c8fccfSJohannes Berg bss = ieee80211_bss_info_update(sdata->local, rx_status, 21298c8fccfSJohannes Berg mgmt, skb->len, &elems, 2132a519311SJohannes Berg channel, beacon); 214d048e503SJouni Malinen if (bss) 21598c8fccfSJohannes Berg ieee80211_rx_bss_put(sdata->local, bss); 21698c8fccfSJohannes Berg 21707ef03eeSJohannes Berg if (channel == sdata->local->oper_channel) 218b23b025fSBen Greear return RX_CONTINUE; 219b23b025fSBen Greear 22098c8fccfSJohannes Berg dev_kfree_skb(skb); 22198c8fccfSJohannes Berg return RX_QUEUED; 22298c8fccfSJohannes Berg } 22398c8fccfSJohannes Berg 2244d36ec58SJohannes Berg /* return false if no more work */ 2254d36ec58SJohannes Berg static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2264d36ec58SJohannes Berg { 2274d36ec58SJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2284d36ec58SJohannes Berg enum ieee80211_band band; 2294d36ec58SJohannes Berg int i, ielen, n_chans; 2304d36ec58SJohannes Berg 2314d36ec58SJohannes Berg do { 2324d36ec58SJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2334d36ec58SJohannes Berg return false; 2344d36ec58SJohannes Berg 2354d36ec58SJohannes Berg band = local->hw_scan_band; 2364d36ec58SJohannes Berg n_chans = 0; 2374d36ec58SJohannes Berg for (i = 0; i < req->n_channels; i++) { 2384d36ec58SJohannes Berg if (req->channels[i]->band == band) { 2394d36ec58SJohannes Berg local->hw_scan_req->channels[n_chans] = 2404d36ec58SJohannes Berg req->channels[i]; 2414d36ec58SJohannes Berg n_chans++; 2424d36ec58SJohannes Berg } 2434d36ec58SJohannes Berg } 2444d36ec58SJohannes Berg 2454d36ec58SJohannes Berg local->hw_scan_band++; 2464d36ec58SJohannes Berg } while (!n_chans); 2474d36ec58SJohannes Berg 2484d36ec58SJohannes Berg local->hw_scan_req->n_channels = n_chans; 2494d36ec58SJohannes Berg 2504d36ec58SJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 2518ee31080SJohannes Berg req->ie, req->ie_len, band, 25285a237feSJohannes Berg req->rates[band], 0); 2534d36ec58SJohannes Berg local->hw_scan_req->ie_len = ielen; 254dcd83976SJohannes Berg local->hw_scan_req->no_cck = req->no_cck; 2554d36ec58SJohannes Berg 2564d36ec58SJohannes Berg return true; 2574d36ec58SJohannes Berg } 2584d36ec58SJohannes Berg 259d07bfd8bSJohannes Berg static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, 260e229f844SStanislaw Gruszka bool was_hw_scan) 261f3b85252SJohannes Berg { 262f3b85252SJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 263f3b85252SJohannes Berg 264e229f844SStanislaw Gruszka lockdep_assert_held(&local->mtx); 265f3b85252SJohannes Berg 2666d3560d4SJohannes Berg /* 2676d3560d4SJohannes Berg * It's ok to abort a not-yet-running scan (that 2686d3560d4SJohannes Berg * we have one at all will be verified by checking 2696d3560d4SJohannes Berg * local->scan_req next), but not to complete it 2706d3560d4SJohannes Berg * successfully. 2716d3560d4SJohannes Berg */ 2726d3560d4SJohannes Berg if (WARN_ON(!local->scanning && !aborted)) 2736d3560d4SJohannes Berg aborted = true; 274f3b85252SJohannes Berg 275e229f844SStanislaw Gruszka if (WARN_ON(!local->scan_req)) 276d07bfd8bSJohannes Berg return; 277f3b85252SJohannes Berg 2784d36ec58SJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 2796eb11a9aSStanislaw Gruszka int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req); 2806eb11a9aSStanislaw Gruszka if (rc == 0) 281d07bfd8bSJohannes Berg return; 2824d36ec58SJohannes Berg } 2834d36ec58SJohannes Berg 2844d36ec58SJohannes Berg kfree(local->hw_scan_req); 2854d36ec58SJohannes Berg local->hw_scan_req = NULL; 286f3b85252SJohannes Berg 2875ba63533SJohannes Berg if (local->scan_req != local->int_scan_req) 2882a519311SJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 2892a519311SJohannes Berg local->scan_req = NULL; 29015db0b7fSJohannes Berg local->scan_sdata = NULL; 2912a519311SJohannes Berg 292fbe9c429SHelmut Schaa local->scanning = 0; 29358905ca5SJohannes Berg local->scan_channel = NULL; 294f3b85252SJohannes Berg 29559bdf3b0SBen Greear /* Set power back to normal operating levels. */ 29659bdf3b0SBen Greear ieee80211_hw_config(local, 0); 297b23b025fSBen Greear 298b23b025fSBen Greear if (!was_hw_scan) { 299b23b025fSBen Greear ieee80211_configure_filter(local); 300b23b025fSBen Greear drv_sw_scan_complete(local); 301e76aadc5SJohannes Berg ieee80211_offchannel_return(local, true); 302b23b025fSBen Greear } 303b23b025fSBen Greear 3045cff20e6SJohannes Berg ieee80211_recalc_idle(local); 305e229f844SStanislaw Gruszka 3060a51b27eSJohannes Berg ieee80211_mlme_notify_scan_completed(local); 30746900298SJohannes Berg ieee80211_ibss_notify_scan_completed(local); 308472dbc45SJohannes Berg ieee80211_mesh_notify_scan_completed(local); 30981ac3462SJohannes Berg ieee80211_queue_work(&local->hw, &local->work_work); 3100a51b27eSJohannes Berg } 3118789d459SJohannes Berg 3128789d459SJohannes Berg void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 3138789d459SJohannes Berg { 3148789d459SJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3158789d459SJohannes Berg 3168789d459SJohannes Berg trace_api_scan_completed(local, aborted); 3178789d459SJohannes Berg 3188789d459SJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3198789d459SJohannes Berg if (aborted) 3208789d459SJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3218789d459SJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3228789d459SJohannes Berg } 3230a51b27eSJohannes Berg EXPORT_SYMBOL(ieee80211_scan_completed); 3240a51b27eSJohannes Berg 325f3b85252SJohannes Berg static int ieee80211_start_sw_scan(struct ieee80211_local *local) 326f3b85252SJohannes Berg { 327f3b85252SJohannes Berg /* 328f3b85252SJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 329f3b85252SJohannes Berg * scanning instead. First send a nullfunc frame with power save 330f3b85252SJohannes Berg * bit on so that AP will buffer the frames for us while we are not 331f3b85252SJohannes Berg * listening, then send probe requests to each channel and wait for 332f3b85252SJohannes Berg * the responses. After all channels are scanned, tune back to the 333f3b85252SJohannes Berg * original channel and send a nullfunc frame with power save bit 334f3b85252SJohannes Berg * off to trigger the AP to send us all the buffered frames. 335f3b85252SJohannes Berg * 336f3b85252SJohannes Berg * Note that while local->sw_scanning is true everything else but 337f3b85252SJohannes Berg * nullfunc frames and probe requests will be dropped in 338f3b85252SJohannes Berg * ieee80211_tx_h_check_assoc(). 339f3b85252SJohannes Berg */ 34024487981SJohannes Berg drv_sw_scan_start(local); 341f3b85252SJohannes Berg 342df13cce5SHelmut Schaa local->leave_oper_channel_time = 0; 343977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 344f3b85252SJohannes Berg local->scan_channel_idx = 0; 345f3b85252SJohannes Berg 34607ef03eeSJohannes Berg ieee80211_offchannel_stop_vifs(local, true); 347a80f7c0bSJohannes Berg 3483ac64beeSJohannes Berg ieee80211_configure_filter(local); 349f3b85252SJohannes Berg 35059bdf3b0SBen Greear /* We need to set power level at maximum rate for scanning. */ 35159bdf3b0SBen Greear ieee80211_hw_config(local, 0); 35259bdf3b0SBen Greear 35342935ecaSLuis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 35407ef03eeSJohannes Berg &local->scan_work, 0); 355f3b85252SJohannes Berg 356f3b85252SJohannes Berg return 0; 357f3b85252SJohannes Berg } 358f3b85252SJohannes Berg 359f3b85252SJohannes Berg 360f3b85252SJohannes Berg static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 361f3b85252SJohannes Berg struct cfg80211_scan_request *req) 362f3b85252SJohannes Berg { 363f3b85252SJohannes Berg struct ieee80211_local *local = sdata->local; 364f3b85252SJohannes Berg int rc; 365f3b85252SJohannes Berg 366e229f844SStanislaw Gruszka lockdep_assert_held(&local->mtx); 367e229f844SStanislaw Gruszka 368f3b85252SJohannes Berg if (local->scan_req) 369f3b85252SJohannes Berg return -EBUSY; 370f3b85252SJohannes Berg 3716e7e6213SJohn W. Linville if (!list_empty(&local->work_list)) { 3726e7e6213SJohn W. Linville /* wait for the work to finish/time out */ 373c0ce77b8SJohannes Berg local->scan_req = req; 374c0ce77b8SJohannes Berg local->scan_sdata = sdata; 375c0ce77b8SJohannes Berg return 0; 376c0ce77b8SJohannes Berg } 377c0ce77b8SJohannes Berg 378f3b85252SJohannes Berg if (local->ops->hw_scan) { 379f3b85252SJohannes Berg u8 *ies; 380f3b85252SJohannes Berg 3814d36ec58SJohannes Berg local->hw_scan_req = kmalloc( 3824d36ec58SJohannes Berg sizeof(*local->hw_scan_req) + 3834d36ec58SJohannes Berg req->n_channels * sizeof(req->channels[0]) + 3844d36ec58SJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 3854d36ec58SJohannes Berg req->ie_len, GFP_KERNEL); 3864d36ec58SJohannes Berg if (!local->hw_scan_req) 387f3b85252SJohannes Berg return -ENOMEM; 388f3b85252SJohannes Berg 3894d36ec58SJohannes Berg local->hw_scan_req->ssids = req->ssids; 3904d36ec58SJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 3914d36ec58SJohannes Berg ies = (u8 *)local->hw_scan_req + 3924d36ec58SJohannes Berg sizeof(*local->hw_scan_req) + 3934d36ec58SJohannes Berg req->n_channels * sizeof(req->channels[0]); 3944d36ec58SJohannes Berg local->hw_scan_req->ie = ies; 3954d36ec58SJohannes Berg 3964d36ec58SJohannes Berg local->hw_scan_band = 0; 3976e7e6213SJohn W. Linville 3986e7e6213SJohn W. Linville /* 3996e7e6213SJohn W. Linville * After allocating local->hw_scan_req, we must 4006e7e6213SJohn W. Linville * go through until ieee80211_prep_hw_scan(), so 4016e7e6213SJohn W. Linville * anything that might be changed here and leave 4026e7e6213SJohn W. Linville * this function early must not go after this 4036e7e6213SJohn W. Linville * allocation. 4046e7e6213SJohn W. Linville */ 405f3b85252SJohannes Berg } 406f3b85252SJohannes Berg 407f3b85252SJohannes Berg local->scan_req = req; 408f3b85252SJohannes Berg local->scan_sdata = sdata; 409f3b85252SJohannes Berg 410f3b85252SJohannes Berg if (local->ops->hw_scan) 411fbe9c429SHelmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 412f3b85252SJohannes Berg else 413fbe9c429SHelmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 4146e7e6213SJohn W. Linville 4155cff20e6SJohannes Berg ieee80211_recalc_idle(local); 416f3b85252SJohannes Berg 4174d36ec58SJohannes Berg if (local->ops->hw_scan) { 4184d36ec58SJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 419a060bbfeSJohannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 4204d36ec58SJohannes Berg } else 421f3b85252SJohannes Berg rc = ieee80211_start_sw_scan(local); 422f3b85252SJohannes Berg 423f3b85252SJohannes Berg if (rc) { 4244d36ec58SJohannes Berg kfree(local->hw_scan_req); 4254d36ec58SJohannes Berg local->hw_scan_req = NULL; 426fbe9c429SHelmut Schaa local->scanning = 0; 427f3b85252SJohannes Berg 4285cff20e6SJohannes Berg ieee80211_recalc_idle(local); 4295cff20e6SJohannes Berg 430f3b85252SJohannes Berg local->scan_req = NULL; 431f3b85252SJohannes Berg local->scan_sdata = NULL; 432f3b85252SJohannes Berg } 433f3b85252SJohannes Berg 434f3b85252SJohannes Berg return rc; 435f3b85252SJohannes Berg } 436f3b85252SJohannes Berg 437df13cce5SHelmut Schaa static unsigned long 438df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 439df13cce5SHelmut Schaa { 440df13cce5SHelmut Schaa /* 441df13cce5SHelmut Schaa * TODO: channel switching also consumes quite some time, 442df13cce5SHelmut Schaa * add that delay as well to get a better estimation 443df13cce5SHelmut Schaa */ 444df13cce5SHelmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 445df13cce5SHelmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 446df13cce5SHelmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 447df13cce5SHelmut Schaa } 448df13cce5SHelmut Schaa 449e229f844SStanislaw Gruszka static void ieee80211_scan_state_decision(struct ieee80211_local *local, 4502fb3f028SHelmut Schaa unsigned long *next_delay) 4512fb3f028SHelmut Schaa { 452142b9f50SHelmut Schaa bool associated = false; 453df13cce5SHelmut Schaa bool tx_empty = true; 454df13cce5SHelmut Schaa bool bad_latency; 455df13cce5SHelmut Schaa bool listen_int_exceeded; 456df13cce5SHelmut Schaa unsigned long min_beacon_int = 0; 457142b9f50SHelmut Schaa struct ieee80211_sub_if_data *sdata; 458df13cce5SHelmut Schaa struct ieee80211_channel *next_chan; 459142b9f50SHelmut Schaa 460df13cce5SHelmut Schaa /* 461df13cce5SHelmut Schaa * check if at least one STA interface is associated, 462df13cce5SHelmut Schaa * check if at least one STA interface has pending tx frames 463df13cce5SHelmut Schaa * and grab the lowest used beacon interval 464df13cce5SHelmut Schaa */ 465142b9f50SHelmut Schaa mutex_lock(&local->iflist_mtx); 466142b9f50SHelmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 4679607e6b6SJohannes Berg if (!ieee80211_sdata_running(sdata)) 468142b9f50SHelmut Schaa continue; 469142b9f50SHelmut Schaa 470142b9f50SHelmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 471142b9f50SHelmut Schaa if (sdata->u.mgd.associated) { 472142b9f50SHelmut Schaa associated = true; 473df13cce5SHelmut Schaa 474df13cce5SHelmut Schaa if (sdata->vif.bss_conf.beacon_int < 475df13cce5SHelmut Schaa min_beacon_int || min_beacon_int == 0) 476df13cce5SHelmut Schaa min_beacon_int = 477df13cce5SHelmut Schaa sdata->vif.bss_conf.beacon_int; 478df13cce5SHelmut Schaa 479df13cce5SHelmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 480df13cce5SHelmut Schaa tx_empty = false; 481142b9f50SHelmut Schaa break; 482142b9f50SHelmut Schaa } 483142b9f50SHelmut Schaa } 484142b9f50SHelmut Schaa } 485df13cce5SHelmut Schaa } 486142b9f50SHelmut Schaa mutex_unlock(&local->iflist_mtx); 487142b9f50SHelmut Schaa 488b23b025fSBen Greear next_chan = local->scan_req->channels[local->scan_channel_idx]; 489b23b025fSBen Greear 490142b9f50SHelmut Schaa /* 491142b9f50SHelmut Schaa * we're currently scanning a different channel, let's 492df13cce5SHelmut Schaa * see if we can scan another channel without interfering 493df13cce5SHelmut Schaa * with the current traffic situation. 494df13cce5SHelmut Schaa * 495df13cce5SHelmut Schaa * Since we don't know if the AP has pending frames for us 496df13cce5SHelmut Schaa * we can only check for our tx queues and use the current 497df13cce5SHelmut Schaa * pm_qos requirements for rx. Hence, if no tx traffic occurs 498df13cce5SHelmut Schaa * at all we will scan as many channels in a row as the pm_qos 499df13cce5SHelmut Schaa * latency allows us to. Additionally we also check for the 500df13cce5SHelmut Schaa * currently negotiated listen interval to prevent losing 501df13cce5SHelmut Schaa * frames unnecessarily. 502df13cce5SHelmut Schaa * 503df13cce5SHelmut Schaa * Otherwise switch back to the operating channel. 504142b9f50SHelmut Schaa */ 505df13cce5SHelmut Schaa 506df13cce5SHelmut Schaa bad_latency = time_after(jiffies + 507df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(next_chan), 508df13cce5SHelmut Schaa local->leave_oper_channel_time + 509f8965467SLinus Torvalds usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); 510df13cce5SHelmut Schaa 511df13cce5SHelmut Schaa listen_int_exceeded = time_after(jiffies + 512df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(next_chan), 513df13cce5SHelmut Schaa local->leave_oper_channel_time + 514df13cce5SHelmut Schaa usecs_to_jiffies(min_beacon_int * 1024) * 515df13cce5SHelmut Schaa local->hw.conf.listen_interval); 516df13cce5SHelmut Schaa 51707ef03eeSJohannes Berg if (associated && (!tx_empty || bad_latency || listen_int_exceeded)) 51807ef03eeSJohannes Berg local->next_scan_state = SCAN_SUSPEND; 519142b9f50SHelmut Schaa else 520977923b0SHelmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 521142b9f50SHelmut Schaa 522142b9f50SHelmut Schaa *next_delay = 0; 5232fb3f028SHelmut Schaa } 5242fb3f028SHelmut Schaa 5252fb3f028SHelmut Schaa static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 5267d3be3ccSHelmut Schaa unsigned long *next_delay) 5277d3be3ccSHelmut Schaa { 5287d3be3ccSHelmut Schaa int skip; 5297d3be3ccSHelmut Schaa struct ieee80211_channel *chan; 5307d3be3ccSHelmut Schaa 5317d3be3ccSHelmut Schaa skip = 0; 5327d3be3ccSHelmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 5337d3be3ccSHelmut Schaa 5347d3be3ccSHelmut Schaa local->scan_channel = chan; 535b23b025fSBen Greear 536584991dcSJohannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 5377d3be3ccSHelmut Schaa skip = 1; 5387d3be3ccSHelmut Schaa 5397d3be3ccSHelmut Schaa /* advance state machine to next channel/band */ 5407d3be3ccSHelmut Schaa local->scan_channel_idx++; 5417d3be3ccSHelmut Schaa 5420ee9c13cSHelmut Schaa if (skip) { 5430ee9c13cSHelmut Schaa /* if we skip this channel return to the decision state */ 5440ee9c13cSHelmut Schaa local->next_scan_state = SCAN_DECISION; 5452fb3f028SHelmut Schaa return; 5460ee9c13cSHelmut Schaa } 5477d3be3ccSHelmut Schaa 5487d3be3ccSHelmut Schaa /* 5497d3be3ccSHelmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 5507d3be3ccSHelmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 5517d3be3ccSHelmut Schaa * but it waits for the probe delay or until a frame is 5527d3be3ccSHelmut Schaa * received - and the received frame would update the NAV). 5537d3be3ccSHelmut Schaa * For now, we do not support waiting until a frame is 5547d3be3ccSHelmut Schaa * received. 5557d3be3ccSHelmut Schaa * 5567d3be3ccSHelmut Schaa * In any case, it is not necessary for a passive scan. 5577d3be3ccSHelmut Schaa */ 5587d3be3ccSHelmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 5597d3be3ccSHelmut Schaa !local->scan_req->n_ssids) { 5607d3be3ccSHelmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 561977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 5622fb3f028SHelmut Schaa return; 5637d3be3ccSHelmut Schaa } 5647d3be3ccSHelmut Schaa 5652fb3f028SHelmut Schaa /* active scan, send probes */ 5667d3be3ccSHelmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 567977923b0SHelmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 5687d3be3ccSHelmut Schaa } 5697d3be3ccSHelmut Schaa 5707d3be3ccSHelmut Schaa static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 5717d3be3ccSHelmut Schaa unsigned long *next_delay) 5727d3be3ccSHelmut Schaa { 5737d3be3ccSHelmut Schaa int i; 5747d3be3ccSHelmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 57585a237feSJohannes Berg enum ieee80211_band band = local->hw.conf.channel->band; 5767d3be3ccSHelmut Schaa 5777d3be3ccSHelmut Schaa for (i = 0; i < local->scan_req->n_ssids; i++) 5787d3be3ccSHelmut Schaa ieee80211_send_probe_req( 5797d3be3ccSHelmut Schaa sdata, NULL, 5807d3be3ccSHelmut Schaa local->scan_req->ssids[i].ssid, 5817d3be3ccSHelmut Schaa local->scan_req->ssids[i].ssid_len, 582a806c558SPaul Stewart local->scan_req->ie, local->scan_req->ie_len, 583aad14cebSRajkumar Manoharan local->scan_req->rates[band], false, 584aad14cebSRajkumar Manoharan local->scan_req->no_cck); 5857d3be3ccSHelmut Schaa 5867d3be3ccSHelmut Schaa /* 5877d3be3ccSHelmut Schaa * After sending probe requests, wait for probe responses 5887d3be3ccSHelmut Schaa * on the channel. 5897d3be3ccSHelmut Schaa */ 5907d3be3ccSHelmut Schaa *next_delay = IEEE80211_CHANNEL_TIME; 591977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 5927d3be3ccSHelmut Schaa } 5937d3be3ccSHelmut Schaa 59407ef03eeSJohannes Berg static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 59507ef03eeSJohannes Berg unsigned long *next_delay) 59607ef03eeSJohannes Berg { 59707ef03eeSJohannes Berg /* switch back to the operating channel */ 59807ef03eeSJohannes Berg local->scan_channel = NULL; 59907ef03eeSJohannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 60007ef03eeSJohannes Berg 60107ef03eeSJohannes Berg /* 60207ef03eeSJohannes Berg * Re-enable vifs and beaconing. Leave PS 60307ef03eeSJohannes Berg * in off-channel state..will put that back 60407ef03eeSJohannes Berg * on-channel at the end of scanning. 60507ef03eeSJohannes Berg */ 606e76aadc5SJohannes Berg ieee80211_offchannel_return(local, false); 60707ef03eeSJohannes Berg 60807ef03eeSJohannes Berg *next_delay = HZ / 5; 60907ef03eeSJohannes Berg /* afterwards, resume scan & go to next channel */ 61007ef03eeSJohannes Berg local->next_scan_state = SCAN_RESUME; 61107ef03eeSJohannes Berg } 61207ef03eeSJohannes Berg 61307ef03eeSJohannes Berg static void ieee80211_scan_state_resume(struct ieee80211_local *local, 61407ef03eeSJohannes Berg unsigned long *next_delay) 61507ef03eeSJohannes Berg { 61607ef03eeSJohannes Berg /* PS already is in off-channel mode */ 61707ef03eeSJohannes Berg ieee80211_offchannel_stop_vifs(local, false); 61807ef03eeSJohannes Berg 61907ef03eeSJohannes Berg if (local->ops->flush) { 62007ef03eeSJohannes Berg drv_flush(local, false); 62107ef03eeSJohannes Berg *next_delay = 0; 62207ef03eeSJohannes Berg } else 62307ef03eeSJohannes Berg *next_delay = HZ / 10; 62407ef03eeSJohannes Berg 62507ef03eeSJohannes Berg /* remember when we left the operating channel */ 62607ef03eeSJohannes Berg local->leave_oper_channel_time = jiffies; 62707ef03eeSJohannes Berg 62807ef03eeSJohannes Berg /* advance to the next channel to be scanned */ 629de2ee84dSMohammed Shafi Shajakhan local->next_scan_state = SCAN_SET_CHANNEL; 63007ef03eeSJohannes Berg } 63107ef03eeSJohannes Berg 632c2b13452SJohannes Berg void ieee80211_scan_work(struct work_struct *work) 6330a51b27eSJohannes Berg { 6340a51b27eSJohannes Berg struct ieee80211_local *local = 6350a51b27eSJohannes Berg container_of(work, struct ieee80211_local, scan_work.work); 636d07bfd8bSJohannes Berg struct ieee80211_sub_if_data *sdata; 6370a51b27eSJohannes Berg unsigned long next_delay = 0; 638d07bfd8bSJohannes Berg bool aborted, hw_scan; 6398789d459SJohannes Berg 640259b62e3SStanislaw Gruszka mutex_lock(&local->mtx); 641259b62e3SStanislaw Gruszka 642d07bfd8bSJohannes Berg sdata = local->scan_sdata; 643d07bfd8bSJohannes Berg 644259b62e3SStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 6458789d459SJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 646259b62e3SStanislaw Gruszka goto out_complete; 6478789d459SJohannes Berg } 6488789d459SJohannes Berg 649259b62e3SStanislaw Gruszka if (!sdata || !local->scan_req) 650259b62e3SStanislaw Gruszka goto out; 651f3b85252SJohannes Berg 652fbe9c429SHelmut Schaa if (local->scan_req && !local->scanning) { 653f3b85252SJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 654f3b85252SJohannes Berg int rc; 655f3b85252SJohannes Berg 656f3b85252SJohannes Berg local->scan_req = NULL; 65715db0b7fSJohannes Berg local->scan_sdata = NULL; 658f3b85252SJohannes Berg 659f3b85252SJohannes Berg rc = __ieee80211_start_scan(sdata, req); 660259b62e3SStanislaw Gruszka if (rc) { 6613aed49efSStanislaw Gruszka /* need to complete scan in cfg80211 */ 6623aed49efSStanislaw Gruszka local->scan_req = req; 663259b62e3SStanislaw Gruszka aborted = true; 664259b62e3SStanislaw Gruszka goto out_complete; 665259b62e3SStanislaw Gruszka } else 666259b62e3SStanislaw Gruszka goto out; 667f3b85252SJohannes Berg } 668f3b85252SJohannes Berg 6695bc75728SJohannes Berg /* 6705bc75728SJohannes Berg * Avoid re-scheduling when the sdata is going away. 6715bc75728SJohannes Berg */ 6729607e6b6SJohannes Berg if (!ieee80211_sdata_running(sdata)) { 673259b62e3SStanislaw Gruszka aborted = true; 674259b62e3SStanislaw Gruszka goto out_complete; 675f3b85252SJohannes Berg } 6760a51b27eSJohannes Berg 677f502d09bSHelmut Schaa /* 678f502d09bSHelmut Schaa * as long as no delay is required advance immediately 679f502d09bSHelmut Schaa * without scheduling a new work 680f502d09bSHelmut Schaa */ 681f502d09bSHelmut Schaa do { 682c29acf20SRajkumar Manoharan if (!ieee80211_sdata_running(sdata)) { 683c29acf20SRajkumar Manoharan aborted = true; 684c29acf20SRajkumar Manoharan goto out_complete; 685c29acf20SRajkumar Manoharan } 686c29acf20SRajkumar Manoharan 687977923b0SHelmut Schaa switch (local->next_scan_state) { 6882fb3f028SHelmut Schaa case SCAN_DECISION: 689e229f844SStanislaw Gruszka /* if no more bands/channels left, complete scan */ 690e229f844SStanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 691e229f844SStanislaw Gruszka aborted = false; 692e229f844SStanislaw Gruszka goto out_complete; 693e229f844SStanislaw Gruszka } 694e229f844SStanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 6950a51b27eSJohannes Berg break; 6962fb3f028SHelmut Schaa case SCAN_SET_CHANNEL: 6972fb3f028SHelmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 6982fb3f028SHelmut Schaa break; 6990a51b27eSJohannes Berg case SCAN_SEND_PROBE: 7007d3be3ccSHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 7010a51b27eSJohannes Berg break; 70207ef03eeSJohannes Berg case SCAN_SUSPEND: 70307ef03eeSJohannes Berg ieee80211_scan_state_suspend(local, &next_delay); 704142b9f50SHelmut Schaa break; 70507ef03eeSJohannes Berg case SCAN_RESUME: 70607ef03eeSJohannes Berg ieee80211_scan_state_resume(local, &next_delay); 707142b9f50SHelmut Schaa break; 7080a51b27eSJohannes Berg } 709f502d09bSHelmut Schaa } while (next_delay == 0); 7100a51b27eSJohannes Berg 71142935ecaSLuis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 712d07bfd8bSJohannes Berg goto out; 713259b62e3SStanislaw Gruszka 714259b62e3SStanislaw Gruszka out_complete: 715e229f844SStanislaw Gruszka hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 716d07bfd8bSJohannes Berg __ieee80211_scan_completed(&local->hw, aborted, hw_scan); 717259b62e3SStanislaw Gruszka out: 718259b62e3SStanislaw Gruszka mutex_unlock(&local->mtx); 7190a51b27eSJohannes Berg } 7200a51b27eSJohannes Berg 721c2b13452SJohannes Berg int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 7222a519311SJohannes Berg struct cfg80211_scan_request *req) 7230a51b27eSJohannes Berg { 724f3b85252SJohannes Berg int res; 7250a51b27eSJohannes Berg 726a1699b75SJohannes Berg mutex_lock(&sdata->local->mtx); 727f3b85252SJohannes Berg res = __ieee80211_start_scan(sdata, req); 728a1699b75SJohannes Berg mutex_unlock(&sdata->local->mtx); 7292a519311SJohannes Berg 730f3b85252SJohannes Berg return res; 7310a51b27eSJohannes Berg } 7320a51b27eSJohannes Berg 733f3b85252SJohannes Berg int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 734be4a4b6aSJohannes Berg const u8 *ssid, u8 ssid_len, 735be4a4b6aSJohannes Berg struct ieee80211_channel *chan) 736f3b85252SJohannes Berg { 737f3b85252SJohannes Berg struct ieee80211_local *local = sdata->local; 738f3b85252SJohannes Berg int ret = -EBUSY; 739fb63bc41SGertjan van Wingerde enum ieee80211_band band; 7409116dd01SJohannes Berg 741a1699b75SJohannes Berg mutex_lock(&local->mtx); 742f3b85252SJohannes Berg 743f3b85252SJohannes Berg /* busy scanning */ 744f3b85252SJohannes Berg if (local->scan_req) 745f3b85252SJohannes Berg goto unlock; 746f3b85252SJohannes Berg 747be4a4b6aSJohannes Berg /* fill internal scan request */ 748be4a4b6aSJohannes Berg if (!chan) { 749be4a4b6aSJohannes Berg int i, nchan = 0; 750be4a4b6aSJohannes Berg 751be4a4b6aSJohannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 752be4a4b6aSJohannes Berg if (!local->hw.wiphy->bands[band]) 753be4a4b6aSJohannes Berg continue; 754be4a4b6aSJohannes Berg for (i = 0; 755be4a4b6aSJohannes Berg i < local->hw.wiphy->bands[band]->n_channels; 756be4a4b6aSJohannes Berg i++) { 757be4a4b6aSJohannes Berg local->int_scan_req->channels[nchan] = 758be4a4b6aSJohannes Berg &local->hw.wiphy->bands[band]->channels[i]; 759be4a4b6aSJohannes Berg nchan++; 760be4a4b6aSJohannes Berg } 761be4a4b6aSJohannes Berg } 762be4a4b6aSJohannes Berg 763be4a4b6aSJohannes Berg local->int_scan_req->n_channels = nchan; 764be4a4b6aSJohannes Berg } else { 765be4a4b6aSJohannes Berg local->int_scan_req->channels[0] = chan; 766be4a4b6aSJohannes Berg local->int_scan_req->n_channels = 1; 767be4a4b6aSJohannes Berg } 768be4a4b6aSJohannes Berg 769be4a4b6aSJohannes Berg local->int_scan_req->ssids = &local->scan_ssid; 770be4a4b6aSJohannes Berg local->int_scan_req->n_ssids = 1; 7715ba63533SJohannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 7725ba63533SJohannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 773f3b85252SJohannes Berg 7745ba63533SJohannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 775f3b85252SJohannes Berg unlock: 776a1699b75SJohannes Berg mutex_unlock(&local->mtx); 777f3b85252SJohannes Berg return ret; 7780a51b27eSJohannes Berg } 7795bb644a0SJohannes Berg 7804136c422SStanislaw Gruszka /* 7814136c422SStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 7824136c422SStanislaw Gruszka */ 7835bb644a0SJohannes Berg void ieee80211_scan_cancel(struct ieee80211_local *local) 7845bb644a0SJohannes Berg { 7855bb644a0SJohannes Berg /* 786b856439bSEliad Peller * We are canceling software scan, or deferred scan that was not 7874136c422SStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 7884136c422SStanislaw Gruszka * 7894136c422SStanislaw Gruszka * Regarding hardware scan: 7904136c422SStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 7914136c422SStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 7924136c422SStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 7934136c422SStanislaw Gruszka * driver which can use local->hw_scan_req 7944136c422SStanislaw Gruszka * 7954136c422SStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 7964136c422SStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 7974136c422SStanislaw Gruszka * 798b856439bSEliad Peller * Hence we only call the cancel_hw_scan() callback, but the low-level 799b856439bSEliad Peller * driver is still responsible for calling ieee80211_scan_completed() 800b856439bSEliad Peller * after the scan was completed/aborted. 8015bb644a0SJohannes Berg */ 8024136c422SStanislaw Gruszka 803a1699b75SJohannes Berg mutex_lock(&local->mtx); 804b856439bSEliad Peller if (!local->scan_req) 805b856439bSEliad Peller goto out; 806b856439bSEliad Peller 807b856439bSEliad Peller if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 808b856439bSEliad Peller if (local->ops->cancel_hw_scan) 809b856439bSEliad Peller drv_cancel_hw_scan(local, local->scan_sdata); 810b856439bSEliad Peller goto out; 811b856439bSEliad Peller } 812b856439bSEliad Peller 813d07bfd8bSJohannes Berg /* 814d07bfd8bSJohannes Berg * If the work is currently running, it must be blocked on 815d07bfd8bSJohannes Berg * the mutex, but we'll set scan_sdata = NULL and it'll 816d07bfd8bSJohannes Berg * simply exit once it acquires the mutex. 817d07bfd8bSJohannes Berg */ 818d07bfd8bSJohannes Berg cancel_delayed_work(&local->scan_work); 819d07bfd8bSJohannes Berg /* and clean up */ 820d07bfd8bSJohannes Berg __ieee80211_scan_completed(&local->hw, true, false); 821b856439bSEliad Peller out: 822d07bfd8bSJohannes Berg mutex_unlock(&local->mtx); 8235bb644a0SJohannes Berg } 82479f460caSLuciano Coelho 82579f460caSLuciano Coelho int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 82679f460caSLuciano Coelho struct cfg80211_sched_scan_request *req) 82779f460caSLuciano Coelho { 82879f460caSLuciano Coelho struct ieee80211_local *local = sdata->local; 82979f460caSLuciano Coelho int ret, i; 83079f460caSLuciano Coelho 83179f460caSLuciano Coelho mutex_lock(&sdata->local->mtx); 83279f460caSLuciano Coelho 83379f460caSLuciano Coelho if (local->sched_scanning) { 83479f460caSLuciano Coelho ret = -EBUSY; 83579f460caSLuciano Coelho goto out; 83679f460caSLuciano Coelho } 83779f460caSLuciano Coelho 83879f460caSLuciano Coelho if (!local->ops->sched_scan_start) { 83979f460caSLuciano Coelho ret = -ENOTSUPP; 84079f460caSLuciano Coelho goto out; 84179f460caSLuciano Coelho } 84279f460caSLuciano Coelho 84379f460caSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 84479f460caSLuciano Coelho local->sched_scan_ies.ie[i] = kzalloc(2 + 84579f460caSLuciano Coelho IEEE80211_MAX_SSID_LEN + 8461186980dSLuciano Coelho local->scan_ies_len + 8471186980dSLuciano Coelho req->ie_len, 84879f460caSLuciano Coelho GFP_KERNEL); 84979f460caSLuciano Coelho if (!local->sched_scan_ies.ie[i]) { 85079f460caSLuciano Coelho ret = -ENOMEM; 85179f460caSLuciano Coelho goto out_free; 85279f460caSLuciano Coelho } 85379f460caSLuciano Coelho 85479f460caSLuciano Coelho local->sched_scan_ies.len[i] = 85579f460caSLuciano Coelho ieee80211_build_preq_ies(local, 85679f460caSLuciano Coelho local->sched_scan_ies.ie[i], 85779f460caSLuciano Coelho req->ie, req->ie_len, i, 85879f460caSLuciano Coelho (u32) -1, 0); 85979f460caSLuciano Coelho } 86079f460caSLuciano Coelho 86179f460caSLuciano Coelho ret = drv_sched_scan_start(local, sdata, req, 86279f460caSLuciano Coelho &local->sched_scan_ies); 86379f460caSLuciano Coelho if (ret == 0) { 86479f460caSLuciano Coelho local->sched_scanning = true; 86579f460caSLuciano Coelho goto out; 86679f460caSLuciano Coelho } 86779f460caSLuciano Coelho 86879f460caSLuciano Coelho out_free: 86979f460caSLuciano Coelho while (i > 0) 87079f460caSLuciano Coelho kfree(local->sched_scan_ies.ie[--i]); 87179f460caSLuciano Coelho out: 87279f460caSLuciano Coelho mutex_unlock(&sdata->local->mtx); 87379f460caSLuciano Coelho return ret; 87479f460caSLuciano Coelho } 87579f460caSLuciano Coelho 87685a9994aSLuciano Coelho int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) 87779f460caSLuciano Coelho { 87879f460caSLuciano Coelho struct ieee80211_local *local = sdata->local; 87979f460caSLuciano Coelho int ret = 0, i; 88079f460caSLuciano Coelho 88179f460caSLuciano Coelho mutex_lock(&sdata->local->mtx); 88279f460caSLuciano Coelho 88379f460caSLuciano Coelho if (!local->ops->sched_scan_stop) { 88479f460caSLuciano Coelho ret = -ENOTSUPP; 88579f460caSLuciano Coelho goto out; 88679f460caSLuciano Coelho } 88779f460caSLuciano Coelho 88879f460caSLuciano Coelho if (local->sched_scanning) { 88979f460caSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) 89079f460caSLuciano Coelho kfree(local->sched_scan_ies.ie[i]); 89179f460caSLuciano Coelho 89279f460caSLuciano Coelho drv_sched_scan_stop(local, sdata); 89379f460caSLuciano Coelho local->sched_scanning = false; 89479f460caSLuciano Coelho } 89579f460caSLuciano Coelho out: 89679f460caSLuciano Coelho mutex_unlock(&sdata->local->mtx); 89779f460caSLuciano Coelho 89879f460caSLuciano Coelho return ret; 89979f460caSLuciano Coelho } 90079f460caSLuciano Coelho 90179f460caSLuciano Coelho void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 90279f460caSLuciano Coelho { 90379f460caSLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 90479f460caSLuciano Coelho 90579f460caSLuciano Coelho trace_api_sched_scan_results(local); 90679f460caSLuciano Coelho 90779f460caSLuciano Coelho cfg80211_sched_scan_results(hw->wiphy); 90879f460caSLuciano Coelho } 90979f460caSLuciano Coelho EXPORT_SYMBOL(ieee80211_sched_scan_results); 91079f460caSLuciano Coelho 91185a9994aSLuciano Coelho void ieee80211_sched_scan_stopped_work(struct work_struct *work) 91285a9994aSLuciano Coelho { 91385a9994aSLuciano Coelho struct ieee80211_local *local = 91485a9994aSLuciano Coelho container_of(work, struct ieee80211_local, 91585a9994aSLuciano Coelho sched_scan_stopped_work); 91685a9994aSLuciano Coelho int i; 91785a9994aSLuciano Coelho 91885a9994aSLuciano Coelho mutex_lock(&local->mtx); 91985a9994aSLuciano Coelho 92085a9994aSLuciano Coelho if (!local->sched_scanning) { 92185a9994aSLuciano Coelho mutex_unlock(&local->mtx); 92285a9994aSLuciano Coelho return; 92385a9994aSLuciano Coelho } 92485a9994aSLuciano Coelho 92585a9994aSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) 92685a9994aSLuciano Coelho kfree(local->sched_scan_ies.ie[i]); 92785a9994aSLuciano Coelho 92885a9994aSLuciano Coelho local->sched_scanning = false; 92985a9994aSLuciano Coelho 93085a9994aSLuciano Coelho mutex_unlock(&local->mtx); 93185a9994aSLuciano Coelho 93285a9994aSLuciano Coelho cfg80211_sched_scan_stopped(local->hw.wiphy); 93385a9994aSLuciano Coelho } 93485a9994aSLuciano Coelho 93579f460caSLuciano Coelho void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 93679f460caSLuciano Coelho { 93779f460caSLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 93879f460caSLuciano Coelho 93979f460caSLuciano Coelho trace_api_sched_scan_stopped(local); 94079f460caSLuciano Coelho 94185a9994aSLuciano Coelho ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); 94279f460caSLuciano Coelho } 94379f460caSLuciano Coelho EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 944