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> 16888d04dfSFelix 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) 303f892b61SStanislaw Gruszka #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) 310a51b27eSJohannes Berg 325484e237SJohannes Berg void ieee80211_rx_bss_put(struct ieee80211_local *local, 33c2b13452SJohannes Berg struct ieee80211_bss *bss) 345484e237SJohannes Berg { 350c1ad2caSJohannes Berg if (!bss) 360c1ad2caSJohannes Berg return; 375b112d3dSJohannes Berg cfg80211_put_bss(local->hw.wiphy, 385b112d3dSJohannes Berg container_of((void *)bss, struct cfg80211_bss, priv)); 395484e237SJohannes Berg } 405484e237SJohannes Berg 41ab13315aSKalle Valo static bool is_uapsd_supported(struct ieee802_11_elems *elems) 42ab13315aSKalle Valo { 43ab13315aSKalle Valo u8 qos_info; 44ab13315aSKalle Valo 45ab13315aSKalle Valo if (elems->wmm_info && elems->wmm_info_len == 7 46ab13315aSKalle Valo && elems->wmm_info[5] == 1) 47ab13315aSKalle Valo qos_info = elems->wmm_info[6]; 48ab13315aSKalle Valo else if (elems->wmm_param && elems->wmm_param_len == 24 49ab13315aSKalle Valo && elems->wmm_param[5] == 1) 50ab13315aSKalle Valo qos_info = elems->wmm_param[6]; 51ab13315aSKalle Valo else 52ab13315aSKalle Valo /* no valid wmm information or parameter element found */ 53ab13315aSKalle Valo return false; 54ab13315aSKalle Valo 55ab13315aSKalle Valo return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 56ab13315aSKalle Valo } 57ab13315aSKalle Valo 58c2b13452SJohannes Berg struct ieee80211_bss * 595484e237SJohannes Berg ieee80211_bss_info_update(struct ieee80211_local *local, 605484e237SJohannes Berg struct ieee80211_rx_status *rx_status, 61d45c4172SEmmanuel Grumbach struct ieee80211_mgmt *mgmt, size_t len, 625484e237SJohannes Berg struct ieee802_11_elems *elems, 63d45c4172SEmmanuel Grumbach struct ieee80211_channel *channel) 645484e237SJohannes Berg { 65d45c4172SEmmanuel Grumbach bool beacon = ieee80211_is_beacon(mgmt->frame_control); 660c1ad2caSJohannes Berg struct cfg80211_bss *cbss; 67c2b13452SJohannes Berg struct ieee80211_bss *bss; 68f0b058b6SStanislaw Gruszka int clen, srlen; 692a519311SJohannes Berg s32 signal = 0; 702a519311SJohannes Berg 7177965c97SJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 722a519311SJohannes Berg signal = rx_status->signal * 100; 7377965c97SJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 742a519311SJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 752a519311SJohannes Berg 760c1ad2caSJohannes Berg cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, 7777965c97SJohannes Berg mgmt, len, signal, GFP_ATOMIC); 780c1ad2caSJohannes Berg if (!cbss) 795484e237SJohannes Berg return NULL; 8000d3f14cSJohannes Berg 810c1ad2caSJohannes Berg bss = (void *)cbss->priv; 825484e237SJohannes Berg 83ef429dadSJohannes Berg if (beacon) 84ef429dadSJohannes Berg bss->device_ts_beacon = rx_status->device_timestamp; 85ef429dadSJohannes Berg else 86ef429dadSJohannes Berg bss->device_ts_presp = rx_status->device_timestamp; 878c358bcdSJohannes Berg 88fcff4f10SPaul Stewart if (elems->parse_error) { 89fcff4f10SPaul Stewart if (beacon) 90fcff4f10SPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 91fcff4f10SPaul Stewart else 92fcff4f10SPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 93fcff4f10SPaul Stewart } else { 94fcff4f10SPaul Stewart if (beacon) 95fcff4f10SPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 96fcff4f10SPaul Stewart else 97fcff4f10SPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 985484e237SJohannes Berg } 995484e237SJohannes Berg 100fcff4f10SPaul Stewart /* save the ERP value so that it is available at association time */ 1011946bed9SJohannes Berg if (elems->erp_info && (!elems->parse_error || 102fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 103fcff4f10SPaul Stewart bss->erp_value = elems->erp_info[0]; 104fcff4f10SPaul Stewart bss->has_erp_value = true; 105fcff4f10SPaul Stewart if (!elems->parse_error) 106fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_ERP; 107fcff4f10SPaul Stewart } 108fcff4f10SPaul Stewart 109f0b058b6SStanislaw Gruszka /* replace old supported rates if we get new values */ 110fcff4f10SPaul Stewart if (!elems->parse_error || 111fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 112f0b058b6SStanislaw Gruszka srlen = 0; 1135484e237SJohannes Berg if (elems->supp_rates) { 114f0b058b6SStanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES; 1155484e237SJohannes Berg if (clen > elems->supp_rates_len) 1165484e237SJohannes Berg clen = elems->supp_rates_len; 117f0b058b6SStanislaw Gruszka memcpy(bss->supp_rates, elems->supp_rates, clen); 118f0b058b6SStanislaw Gruszka srlen += clen; 1195484e237SJohannes Berg } 1205484e237SJohannes Berg if (elems->ext_supp_rates) { 121f0b058b6SStanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES - srlen; 1225484e237SJohannes Berg if (clen > elems->ext_supp_rates_len) 1235484e237SJohannes Berg clen = elems->ext_supp_rates_len; 124fcff4f10SPaul Stewart memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 125fcff4f10SPaul Stewart clen); 126f0b058b6SStanislaw Gruszka srlen += clen; 1275484e237SJohannes Berg } 128fcff4f10SPaul Stewart if (srlen) { 129f0b058b6SStanislaw Gruszka bss->supp_rates_len = srlen; 130fcff4f10SPaul Stewart if (!elems->parse_error) 131fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_RATES; 132fcff4f10SPaul Stewart } 133fcff4f10SPaul Stewart } 1345484e237SJohannes Berg 135fcff4f10SPaul Stewart if (!elems->parse_error || 136fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 1375484e237SJohannes Berg bss->wmm_used = elems->wmm_param || elems->wmm_info; 138ab13315aSKalle Valo bss->uapsd_supported = is_uapsd_supported(elems); 139fcff4f10SPaul Stewart if (!elems->parse_error) 140fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_WMM; 141fcff4f10SPaul Stewart } 1425484e237SJohannes Berg 143*817cee76SAlexander Bondar if (beacon) { 144*817cee76SAlexander Bondar struct ieee80211_supported_band *sband = 145*817cee76SAlexander Bondar local->hw.wiphy->bands[rx_status->band]; 146*817cee76SAlexander Bondar if (!(rx_status->flag & RX_FLAG_HT) && 147*817cee76SAlexander Bondar !(rx_status->flag & RX_FLAG_VHT)) 148*817cee76SAlexander Bondar bss->beacon_rate = 149*817cee76SAlexander Bondar &sband->bitrates[rx_status->rate_idx]; 150*817cee76SAlexander Bondar } 151*817cee76SAlexander Bondar 1525484e237SJohannes Berg return bss; 1535484e237SJohannes Berg } 1540a51b27eSJohannes Berg 155d48b2968SJohannes Berg void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 15698c8fccfSJohannes Berg { 157f1d58c25SJohannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 158d48b2968SJohannes Berg struct ieee80211_sub_if_data *sdata1, *sdata2; 159d48b2968SJohannes Berg struct ieee80211_mgmt *mgmt = (void *)skb->data; 160c2b13452SJohannes Berg struct ieee80211_bss *bss; 16198c8fccfSJohannes Berg u8 *elements; 16298c8fccfSJohannes Berg struct ieee80211_channel *channel; 16398c8fccfSJohannes Berg size_t baselen; 16498c8fccfSJohannes Berg struct ieee802_11_elems elems; 16598c8fccfSJohannes Berg 166d48b2968SJohannes Berg if (skb->len < 24 || 167d48b2968SJohannes Berg (!ieee80211_is_probe_resp(mgmt->frame_control) && 168d48b2968SJohannes Berg !ieee80211_is_beacon(mgmt->frame_control))) 169d48b2968SJohannes Berg return; 17098c8fccfSJohannes Berg 171d48b2968SJohannes Berg sdata1 = rcu_dereference(local->scan_sdata); 172d48b2968SJohannes Berg sdata2 = rcu_dereference(local->sched_scan_sdata); 17398c8fccfSJohannes Berg 174d48b2968SJohannes Berg if (likely(!sdata1 && !sdata2)) 175d48b2968SJohannes Berg return; 17698c8fccfSJohannes Berg 177d48b2968SJohannes Berg if (ieee80211_is_probe_resp(mgmt->frame_control)) { 17898c8fccfSJohannes Berg /* ignore ProbeResp to foreign address */ 179d48b2968SJohannes Berg if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && 180d48b2968SJohannes Berg (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) 181d48b2968SJohannes Berg return; 18298c8fccfSJohannes Berg 18398c8fccfSJohannes Berg elements = mgmt->u.probe_resp.variable; 18498c8fccfSJohannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 18598c8fccfSJohannes Berg } else { 18698c8fccfSJohannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 18798c8fccfSJohannes Berg elements = mgmt->u.beacon.variable; 18898c8fccfSJohannes Berg } 18998c8fccfSJohannes Berg 19098c8fccfSJohannes Berg if (baselen > skb->len) 191d48b2968SJohannes Berg return; 19298c8fccfSJohannes Berg 193b2e506bfSJohannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); 19498c8fccfSJohannes Berg 1950172bb75SJohannes Berg channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 19698c8fccfSJohannes Berg 19798c8fccfSJohannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 198d48b2968SJohannes Berg return; 19998c8fccfSJohannes Berg 200d48b2968SJohannes Berg bss = ieee80211_bss_info_update(local, rx_status, 20198c8fccfSJohannes Berg mgmt, skb->len, &elems, 202d45c4172SEmmanuel Grumbach channel); 203d048e503SJouni Malinen if (bss) 204d48b2968SJohannes Berg ieee80211_rx_bss_put(local, bss); 20598c8fccfSJohannes Berg } 20698c8fccfSJohannes Berg 2074d36ec58SJohannes Berg /* return false if no more work */ 2084d36ec58SJohannes Berg static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2094d36ec58SJohannes Berg { 2104d36ec58SJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2114d36ec58SJohannes Berg enum ieee80211_band band; 2124d36ec58SJohannes Berg int i, ielen, n_chans; 2134d36ec58SJohannes Berg 2144d36ec58SJohannes Berg do { 2154d36ec58SJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2164d36ec58SJohannes Berg return false; 2174d36ec58SJohannes Berg 2184d36ec58SJohannes Berg band = local->hw_scan_band; 2194d36ec58SJohannes Berg n_chans = 0; 2204d36ec58SJohannes Berg for (i = 0; i < req->n_channels; i++) { 2214d36ec58SJohannes Berg if (req->channels[i]->band == band) { 2224d36ec58SJohannes Berg local->hw_scan_req->channels[n_chans] = 2234d36ec58SJohannes Berg req->channels[i]; 2244d36ec58SJohannes Berg n_chans++; 2254d36ec58SJohannes Berg } 2264d36ec58SJohannes Berg } 2274d36ec58SJohannes Berg 2284d36ec58SJohannes Berg local->hw_scan_band++; 2294d36ec58SJohannes Berg } while (!n_chans); 2304d36ec58SJohannes Berg 2314d36ec58SJohannes Berg local->hw_scan_req->n_channels = n_chans; 2324d36ec58SJohannes Berg 2334d36ec58SJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 234c604b9f2SJohannes Berg local->hw_scan_ies_bufsize, 2358ee31080SJohannes Berg req->ie, req->ie_len, band, 23685a237feSJohannes Berg req->rates[band], 0); 2374d36ec58SJohannes Berg local->hw_scan_req->ie_len = ielen; 238dcd83976SJohannes Berg local->hw_scan_req->no_cck = req->no_cck; 2394d36ec58SJohannes Berg 2404d36ec58SJohannes Berg return true; 2414d36ec58SJohannes Berg } 2424d36ec58SJohannes Berg 243d07bfd8bSJohannes Berg static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, 244e229f844SStanislaw Gruszka bool was_hw_scan) 245f3b85252SJohannes Berg { 246f3b85252SJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 247f3b85252SJohannes Berg 248e229f844SStanislaw Gruszka lockdep_assert_held(&local->mtx); 249f3b85252SJohannes Berg 2506d3560d4SJohannes Berg /* 2516d3560d4SJohannes Berg * It's ok to abort a not-yet-running scan (that 2526d3560d4SJohannes Berg * we have one at all will be verified by checking 2536d3560d4SJohannes Berg * local->scan_req next), but not to complete it 2546d3560d4SJohannes Berg * successfully. 2556d3560d4SJohannes Berg */ 2566d3560d4SJohannes Berg if (WARN_ON(!local->scanning && !aborted)) 2576d3560d4SJohannes Berg aborted = true; 258f3b85252SJohannes Berg 259e229f844SStanislaw Gruszka if (WARN_ON(!local->scan_req)) 260d07bfd8bSJohannes Berg return; 261f3b85252SJohannes Berg 2624d36ec58SJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 263e2fd5dbcSJohannes Berg int rc; 264e2fd5dbcSJohannes Berg 265e2fd5dbcSJohannes Berg rc = drv_hw_scan(local, 266e2fd5dbcSJohannes Berg rcu_dereference_protected(local->scan_sdata, 267e2fd5dbcSJohannes Berg lockdep_is_held(&local->mtx)), 268e2fd5dbcSJohannes Berg local->hw_scan_req); 269e2fd5dbcSJohannes Berg 2706eb11a9aSStanislaw Gruszka if (rc == 0) 271d07bfd8bSJohannes Berg return; 2724d36ec58SJohannes Berg } 2734d36ec58SJohannes Berg 2744d36ec58SJohannes Berg kfree(local->hw_scan_req); 2754d36ec58SJohannes Berg local->hw_scan_req = NULL; 276f3b85252SJohannes Berg 2775ba63533SJohannes Berg if (local->scan_req != local->int_scan_req) 2782a519311SJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 2792a519311SJohannes Berg local->scan_req = NULL; 2803aa569c3SJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 2812a519311SJohannes Berg 282fbe9c429SHelmut Schaa local->scanning = 0; 28358905ca5SJohannes Berg local->scan_channel = NULL; 284f3b85252SJohannes Berg 28559bdf3b0SBen Greear /* Set power back to normal operating levels. */ 28659bdf3b0SBen Greear ieee80211_hw_config(local, 0); 287b23b025fSBen Greear 288b23b025fSBen Greear if (!was_hw_scan) { 289b23b025fSBen Greear ieee80211_configure_filter(local); 290b23b025fSBen Greear drv_sw_scan_complete(local); 291aacde9eeSStanislaw Gruszka ieee80211_offchannel_return(local); 292b23b025fSBen Greear } 293b23b025fSBen Greear 2945cff20e6SJohannes Berg ieee80211_recalc_idle(local); 295e229f844SStanislaw Gruszka 2960a51b27eSJohannes Berg ieee80211_mlme_notify_scan_completed(local); 29746900298SJohannes Berg ieee80211_ibss_notify_scan_completed(local); 298472dbc45SJohannes Berg ieee80211_mesh_notify_scan_completed(local); 2992eb278e0SJohannes Berg ieee80211_start_next_roc(local); 3000a51b27eSJohannes Berg } 3018789d459SJohannes Berg 3028789d459SJohannes Berg void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 3038789d459SJohannes Berg { 3048789d459SJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3058789d459SJohannes Berg 3068789d459SJohannes Berg trace_api_scan_completed(local, aborted); 3078789d459SJohannes Berg 3088789d459SJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3098789d459SJohannes Berg if (aborted) 3108789d459SJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3118789d459SJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3128789d459SJohannes Berg } 3130a51b27eSJohannes Berg EXPORT_SYMBOL(ieee80211_scan_completed); 3140a51b27eSJohannes Berg 315f3b85252SJohannes Berg static int ieee80211_start_sw_scan(struct ieee80211_local *local) 316f3b85252SJohannes Berg { 317fe57d9f5SJohannes Berg /* Software scan is not supported in multi-channel cases */ 318fe57d9f5SJohannes Berg if (local->use_chanctx) 319fe57d9f5SJohannes Berg return -EOPNOTSUPP; 320fe57d9f5SJohannes Berg 321f3b85252SJohannes Berg /* 322f3b85252SJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 323f3b85252SJohannes Berg * scanning instead. First send a nullfunc frame with power save 324f3b85252SJohannes Berg * bit on so that AP will buffer the frames for us while we are not 325f3b85252SJohannes Berg * listening, then send probe requests to each channel and wait for 326f3b85252SJohannes Berg * the responses. After all channels are scanned, tune back to the 327f3b85252SJohannes Berg * original channel and send a nullfunc frame with power save bit 328f3b85252SJohannes Berg * off to trigger the AP to send us all the buffered frames. 329f3b85252SJohannes Berg * 330f3b85252SJohannes Berg * Note that while local->sw_scanning is true everything else but 331f3b85252SJohannes Berg * nullfunc frames and probe requests will be dropped in 332f3b85252SJohannes Berg * ieee80211_tx_h_check_assoc(). 333f3b85252SJohannes Berg */ 33424487981SJohannes Berg drv_sw_scan_start(local); 335f3b85252SJohannes Berg 336de312db3SRajkumar Manoharan local->leave_oper_channel_time = jiffies; 337977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 338f3b85252SJohannes Berg local->scan_channel_idx = 0; 339f3b85252SJohannes Berg 340aacde9eeSStanislaw Gruszka ieee80211_offchannel_stop_vifs(local); 341a80f7c0bSJohannes Berg 3429c35d7d2SSeth Forshee /* ensure nullfunc is transmitted before leaving operating channel */ 34339ecc01dSJohannes Berg ieee80211_flush_queues(local, NULL); 3449c35d7d2SSeth Forshee 3453ac64beeSJohannes Berg ieee80211_configure_filter(local); 346f3b85252SJohannes Berg 34759bdf3b0SBen Greear /* We need to set power level at maximum rate for scanning. */ 34859bdf3b0SBen Greear ieee80211_hw_config(local, 0); 34959bdf3b0SBen Greear 35042935ecaSLuis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 35107ef03eeSJohannes Berg &local->scan_work, 0); 352f3b85252SJohannes Berg 353f3b85252SJohannes Berg return 0; 354f3b85252SJohannes Berg } 355f3b85252SJohannes Berg 356133d40f9SStanislaw Gruszka static bool ieee80211_can_scan(struct ieee80211_local *local, 357133d40f9SStanislaw Gruszka struct ieee80211_sub_if_data *sdata) 358133d40f9SStanislaw Gruszka { 359164eb02dSSimon Wunderlich if (local->radar_detect_enabled) 360164eb02dSSimon Wunderlich return false; 361164eb02dSSimon Wunderlich 3622eb278e0SJohannes Berg if (!list_empty(&local->roc_list)) 363133d40f9SStanislaw Gruszka return false; 364133d40f9SStanislaw Gruszka 365133d40f9SStanislaw Gruszka if (sdata->vif.type == NL80211_IFTYPE_STATION && 366133d40f9SStanislaw Gruszka sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | 367133d40f9SStanislaw Gruszka IEEE80211_STA_CONNECTION_POLL)) 368133d40f9SStanislaw Gruszka return false; 369133d40f9SStanislaw Gruszka 370133d40f9SStanislaw Gruszka return true; 371133d40f9SStanislaw Gruszka } 372133d40f9SStanislaw Gruszka 373133d40f9SStanislaw Gruszka void ieee80211_run_deferred_scan(struct ieee80211_local *local) 374133d40f9SStanislaw Gruszka { 375133d40f9SStanislaw Gruszka lockdep_assert_held(&local->mtx); 376133d40f9SStanislaw Gruszka 377133d40f9SStanislaw Gruszka if (!local->scan_req || local->scanning) 378133d40f9SStanislaw Gruszka return; 379133d40f9SStanislaw Gruszka 380e2fd5dbcSJohannes Berg if (!ieee80211_can_scan(local, 381e2fd5dbcSJohannes Berg rcu_dereference_protected( 382e2fd5dbcSJohannes Berg local->scan_sdata, 383e2fd5dbcSJohannes Berg lockdep_is_held(&local->mtx)))) 384133d40f9SStanislaw Gruszka return; 385133d40f9SStanislaw Gruszka 386133d40f9SStanislaw Gruszka ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 387133d40f9SStanislaw Gruszka round_jiffies_relative(0)); 388133d40f9SStanislaw Gruszka } 389f3b85252SJohannes Berg 3908a690674SBen Greear static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 3918a690674SBen Greear unsigned long *next_delay) 3928a690674SBen Greear { 3938a690674SBen Greear int i; 394e2fd5dbcSJohannes Berg struct ieee80211_sub_if_data *sdata; 395675a0b04SKarl Beldan enum ieee80211_band band = local->hw.conf.chandef.chan->band; 3966c17b77bSSeth Forshee u32 tx_flags; 3976c17b77bSSeth Forshee 3986c17b77bSSeth Forshee tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 3996c17b77bSSeth Forshee if (local->scan_req->no_cck) 4006c17b77bSSeth Forshee tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 4018a690674SBen Greear 402e2fd5dbcSJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 403316b6b5dSPeter Senna Tschudin lockdep_is_held(&local->mtx)); 404e2fd5dbcSJohannes Berg 4058a690674SBen Greear for (i = 0; i < local->scan_req->n_ssids; i++) 4068a690674SBen Greear ieee80211_send_probe_req( 4078a690674SBen Greear sdata, NULL, 4088a690674SBen Greear local->scan_req->ssids[i].ssid, 4098a690674SBen Greear local->scan_req->ssids[i].ssid_len, 4108a690674SBen Greear local->scan_req->ie, local->scan_req->ie_len, 4118a690674SBen Greear local->scan_req->rates[band], false, 412675a0b04SKarl Beldan tx_flags, local->hw.conf.chandef.chan, true); 4138a690674SBen Greear 4148a690674SBen Greear /* 4158a690674SBen Greear * After sending probe requests, wait for probe responses 4168a690674SBen Greear * on the channel. 4178a690674SBen Greear */ 4188a690674SBen Greear *next_delay = IEEE80211_CHANNEL_TIME; 4198a690674SBen Greear local->next_scan_state = SCAN_DECISION; 4208a690674SBen Greear } 4218a690674SBen Greear 422f3b85252SJohannes Berg static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 423f3b85252SJohannes Berg struct cfg80211_scan_request *req) 424f3b85252SJohannes Berg { 425f3b85252SJohannes Berg struct ieee80211_local *local = sdata->local; 426f3b85252SJohannes Berg int rc; 427f3b85252SJohannes Berg 428e229f844SStanislaw Gruszka lockdep_assert_held(&local->mtx); 429e229f844SStanislaw Gruszka 430f3b85252SJohannes Berg if (local->scan_req) 431f3b85252SJohannes Berg return -EBUSY; 432f3b85252SJohannes Berg 433133d40f9SStanislaw Gruszka if (!ieee80211_can_scan(local, sdata)) { 4346e7e6213SJohn W. Linville /* wait for the work to finish/time out */ 435c0ce77b8SJohannes Berg local->scan_req = req; 436e2fd5dbcSJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 437c0ce77b8SJohannes Berg return 0; 438c0ce77b8SJohannes Berg } 439c0ce77b8SJohannes Berg 440f3b85252SJohannes Berg if (local->ops->hw_scan) { 441f3b85252SJohannes Berg u8 *ies; 442f3b85252SJohannes Berg 443c604b9f2SJohannes Berg local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + 444c604b9f2SJohannes Berg local->scan_ies_len + 445c604b9f2SJohannes Berg req->ie_len; 4464d36ec58SJohannes Berg local->hw_scan_req = kmalloc( 4474d36ec58SJohannes Berg sizeof(*local->hw_scan_req) + 4484d36ec58SJohannes Berg req->n_channels * sizeof(req->channels[0]) + 449c604b9f2SJohannes Berg local->hw_scan_ies_bufsize, GFP_KERNEL); 4504d36ec58SJohannes Berg if (!local->hw_scan_req) 451f3b85252SJohannes Berg return -ENOMEM; 452f3b85252SJohannes Berg 4534d36ec58SJohannes Berg local->hw_scan_req->ssids = req->ssids; 4544d36ec58SJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 4554d36ec58SJohannes Berg ies = (u8 *)local->hw_scan_req + 4564d36ec58SJohannes Berg sizeof(*local->hw_scan_req) + 4574d36ec58SJohannes Berg req->n_channels * sizeof(req->channels[0]); 4584d36ec58SJohannes Berg local->hw_scan_req->ie = ies; 459cd2bb512SSam Leffler local->hw_scan_req->flags = req->flags; 4604d36ec58SJohannes Berg 4614d36ec58SJohannes Berg local->hw_scan_band = 0; 4626e7e6213SJohn W. Linville 4636e7e6213SJohn W. Linville /* 4646e7e6213SJohn W. Linville * After allocating local->hw_scan_req, we must 4656e7e6213SJohn W. Linville * go through until ieee80211_prep_hw_scan(), so 4666e7e6213SJohn W. Linville * anything that might be changed here and leave 4676e7e6213SJohn W. Linville * this function early must not go after this 4686e7e6213SJohn W. Linville * allocation. 4696e7e6213SJohn W. Linville */ 470f3b85252SJohannes Berg } 471f3b85252SJohannes Berg 472f3b85252SJohannes Berg local->scan_req = req; 473e2fd5dbcSJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 474f3b85252SJohannes Berg 4758a690674SBen Greear if (local->ops->hw_scan) { 476fbe9c429SHelmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 4778a690674SBen Greear } else if ((req->n_channels == 1) && 478675a0b04SKarl Beldan (req->channels[0] == local->_oper_chandef.chan)) { 4799b864870SJohannes Berg /* 4809b864870SJohannes Berg * If we are scanning only on the operating channel 4819b864870SJohannes Berg * then we do not need to stop normal activities 4828a690674SBen Greear */ 4838a690674SBen Greear unsigned long next_delay; 4848a690674SBen Greear 4858a690674SBen Greear __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 4868a690674SBen Greear 4878a690674SBen Greear ieee80211_recalc_idle(local); 4888a690674SBen Greear 4898a690674SBen Greear /* Notify driver scan is starting, keep order of operations 4908a690674SBen Greear * same as normal software scan, in case that matters. */ 4918a690674SBen Greear drv_sw_scan_start(local); 4928a690674SBen Greear 4938a690674SBen Greear ieee80211_configure_filter(local); /* accept probe-responses */ 4948a690674SBen Greear 4958a690674SBen Greear /* We need to ensure power level is at max for scanning. */ 4968a690674SBen Greear ieee80211_hw_config(local, 0); 4978a690674SBen Greear 4988a690674SBen Greear if ((req->channels[0]->flags & 4998a690674SBen Greear IEEE80211_CHAN_PASSIVE_SCAN) || 5008a690674SBen Greear !local->scan_req->n_ssids) { 5018a690674SBen Greear next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 5028a690674SBen Greear } else { 5038a690674SBen Greear ieee80211_scan_state_send_probe(local, &next_delay); 5048a690674SBen Greear next_delay = IEEE80211_CHANNEL_TIME; 5058a690674SBen Greear } 5068a690674SBen Greear 5078a690674SBen Greear /* Now, just wait a bit and we are all done! */ 5088a690674SBen Greear ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 5098a690674SBen Greear next_delay); 5108a690674SBen Greear return 0; 5118a690674SBen Greear } else { 5128a690674SBen Greear /* Do normal software scan */ 513fbe9c429SHelmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 5148a690674SBen Greear } 5156e7e6213SJohn W. Linville 5165cff20e6SJohannes Berg ieee80211_recalc_idle(local); 517f3b85252SJohannes Berg 5184d36ec58SJohannes Berg if (local->ops->hw_scan) { 5194d36ec58SJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 520a060bbfeSJohannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 5214d36ec58SJohannes Berg } else 522f3b85252SJohannes Berg rc = ieee80211_start_sw_scan(local); 523f3b85252SJohannes Berg 524f3b85252SJohannes Berg if (rc) { 5254d36ec58SJohannes Berg kfree(local->hw_scan_req); 5264d36ec58SJohannes Berg local->hw_scan_req = NULL; 527fbe9c429SHelmut Schaa local->scanning = 0; 528f3b85252SJohannes Berg 5295cff20e6SJohannes Berg ieee80211_recalc_idle(local); 5305cff20e6SJohannes Berg 531f3b85252SJohannes Berg local->scan_req = NULL; 532e2fd5dbcSJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 533f3b85252SJohannes Berg } 534f3b85252SJohannes Berg 535f3b85252SJohannes Berg return rc; 536f3b85252SJohannes Berg } 537f3b85252SJohannes Berg 538df13cce5SHelmut Schaa static unsigned long 539df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 540df13cce5SHelmut Schaa { 541df13cce5SHelmut Schaa /* 542df13cce5SHelmut Schaa * TODO: channel switching also consumes quite some time, 543df13cce5SHelmut Schaa * add that delay as well to get a better estimation 544df13cce5SHelmut Schaa */ 545df13cce5SHelmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 546df13cce5SHelmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 547df13cce5SHelmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 548df13cce5SHelmut Schaa } 549df13cce5SHelmut Schaa 550e229f844SStanislaw Gruszka static void ieee80211_scan_state_decision(struct ieee80211_local *local, 5512fb3f028SHelmut Schaa unsigned long *next_delay) 5522fb3f028SHelmut Schaa { 553142b9f50SHelmut Schaa bool associated = false; 554df13cce5SHelmut Schaa bool tx_empty = true; 555df13cce5SHelmut Schaa bool bad_latency; 556142b9f50SHelmut Schaa struct ieee80211_sub_if_data *sdata; 557df13cce5SHelmut Schaa struct ieee80211_channel *next_chan; 558cd2bb512SSam Leffler enum mac80211_scan_state next_scan_state; 559142b9f50SHelmut Schaa 560df13cce5SHelmut Schaa /* 561df13cce5SHelmut Schaa * check if at least one STA interface is associated, 562df13cce5SHelmut Schaa * check if at least one STA interface has pending tx frames 563df13cce5SHelmut Schaa * and grab the lowest used beacon interval 564df13cce5SHelmut Schaa */ 565142b9f50SHelmut Schaa mutex_lock(&local->iflist_mtx); 566142b9f50SHelmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 5679607e6b6SJohannes Berg if (!ieee80211_sdata_running(sdata)) 568142b9f50SHelmut Schaa continue; 569142b9f50SHelmut Schaa 570142b9f50SHelmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 571142b9f50SHelmut Schaa if (sdata->u.mgd.associated) { 572142b9f50SHelmut Schaa associated = true; 573df13cce5SHelmut Schaa 574df13cce5SHelmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 575df13cce5SHelmut Schaa tx_empty = false; 576142b9f50SHelmut Schaa break; 577142b9f50SHelmut Schaa } 578142b9f50SHelmut Schaa } 579142b9f50SHelmut Schaa } 580df13cce5SHelmut Schaa } 581142b9f50SHelmut Schaa mutex_unlock(&local->iflist_mtx); 582142b9f50SHelmut Schaa 583b23b025fSBen Greear next_chan = local->scan_req->channels[local->scan_channel_idx]; 584b23b025fSBen Greear 585142b9f50SHelmut Schaa /* 586142b9f50SHelmut Schaa * we're currently scanning a different channel, let's 587df13cce5SHelmut Schaa * see if we can scan another channel without interfering 588df13cce5SHelmut Schaa * with the current traffic situation. 589df13cce5SHelmut Schaa * 5903f892b61SStanislaw Gruszka * Keep good latency, do not stay off-channel more than 125 ms. 591142b9f50SHelmut Schaa */ 592df13cce5SHelmut Schaa 593df13cce5SHelmut Schaa bad_latency = time_after(jiffies + 594df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(next_chan), 5953f892b61SStanislaw Gruszka local->leave_oper_channel_time + HZ / 8); 596df13cce5SHelmut Schaa 597cd2bb512SSam Leffler if (associated && !tx_empty) { 598cd2bb512SSam Leffler if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 599cd2bb512SSam Leffler next_scan_state = SCAN_ABORT; 600142b9f50SHelmut Schaa else 601cd2bb512SSam Leffler next_scan_state = SCAN_SUSPEND; 6023f892b61SStanislaw Gruszka } else if (associated && bad_latency) { 603cd2bb512SSam Leffler next_scan_state = SCAN_SUSPEND; 604cd2bb512SSam Leffler } else { 605cd2bb512SSam Leffler next_scan_state = SCAN_SET_CHANNEL; 606cd2bb512SSam Leffler } 607cd2bb512SSam Leffler 608cd2bb512SSam Leffler local->next_scan_state = next_scan_state; 609142b9f50SHelmut Schaa 610142b9f50SHelmut Schaa *next_delay = 0; 6112fb3f028SHelmut Schaa } 6122fb3f028SHelmut Schaa 6132fb3f028SHelmut Schaa static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 6147d3be3ccSHelmut Schaa unsigned long *next_delay) 6157d3be3ccSHelmut Schaa { 6167d3be3ccSHelmut Schaa int skip; 6177d3be3ccSHelmut Schaa struct ieee80211_channel *chan; 6187d3be3ccSHelmut Schaa 6197d3be3ccSHelmut Schaa skip = 0; 6207d3be3ccSHelmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 6217d3be3ccSHelmut Schaa 6227d3be3ccSHelmut Schaa local->scan_channel = chan; 623b23b025fSBen Greear 624584991dcSJohannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 6257d3be3ccSHelmut Schaa skip = 1; 6267d3be3ccSHelmut Schaa 6277d3be3ccSHelmut Schaa /* advance state machine to next channel/band */ 6287d3be3ccSHelmut Schaa local->scan_channel_idx++; 6297d3be3ccSHelmut Schaa 6300ee9c13cSHelmut Schaa if (skip) { 6310ee9c13cSHelmut Schaa /* if we skip this channel return to the decision state */ 6320ee9c13cSHelmut Schaa local->next_scan_state = SCAN_DECISION; 6332fb3f028SHelmut Schaa return; 6340ee9c13cSHelmut Schaa } 6357d3be3ccSHelmut Schaa 6367d3be3ccSHelmut Schaa /* 6377d3be3ccSHelmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6387d3be3ccSHelmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6397d3be3ccSHelmut Schaa * but it waits for the probe delay or until a frame is 6407d3be3ccSHelmut Schaa * received - and the received frame would update the NAV). 6417d3be3ccSHelmut Schaa * For now, we do not support waiting until a frame is 6427d3be3ccSHelmut Schaa * received. 6437d3be3ccSHelmut Schaa * 6447d3be3ccSHelmut Schaa * In any case, it is not necessary for a passive scan. 6457d3be3ccSHelmut Schaa */ 6467d3be3ccSHelmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6477d3be3ccSHelmut Schaa !local->scan_req->n_ssids) { 6487d3be3ccSHelmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 649977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 6502fb3f028SHelmut Schaa return; 6517d3be3ccSHelmut Schaa } 6527d3be3ccSHelmut Schaa 6532fb3f028SHelmut Schaa /* active scan, send probes */ 6547d3be3ccSHelmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 655977923b0SHelmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6567d3be3ccSHelmut Schaa } 6577d3be3ccSHelmut Schaa 65807ef03eeSJohannes Berg static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 65907ef03eeSJohannes Berg unsigned long *next_delay) 66007ef03eeSJohannes Berg { 66107ef03eeSJohannes Berg /* switch back to the operating channel */ 66207ef03eeSJohannes Berg local->scan_channel = NULL; 66307ef03eeSJohannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 66407ef03eeSJohannes Berg 665aacde9eeSStanislaw Gruszka /* disable PS */ 666aacde9eeSStanislaw Gruszka ieee80211_offchannel_return(local); 66707ef03eeSJohannes Berg 66807ef03eeSJohannes Berg *next_delay = HZ / 5; 66907ef03eeSJohannes Berg /* afterwards, resume scan & go to next channel */ 67007ef03eeSJohannes Berg local->next_scan_state = SCAN_RESUME; 67107ef03eeSJohannes Berg } 67207ef03eeSJohannes Berg 67307ef03eeSJohannes Berg static void ieee80211_scan_state_resume(struct ieee80211_local *local, 67407ef03eeSJohannes Berg unsigned long *next_delay) 67507ef03eeSJohannes Berg { 676aacde9eeSStanislaw Gruszka ieee80211_offchannel_stop_vifs(local); 67707ef03eeSJohannes Berg 67807ef03eeSJohannes Berg if (local->ops->flush) { 67939ecc01dSJohannes Berg ieee80211_flush_queues(local, NULL); 68007ef03eeSJohannes Berg *next_delay = 0; 68107ef03eeSJohannes Berg } else 68207ef03eeSJohannes Berg *next_delay = HZ / 10; 68307ef03eeSJohannes Berg 68407ef03eeSJohannes Berg /* remember when we left the operating channel */ 68507ef03eeSJohannes Berg local->leave_oper_channel_time = jiffies; 68607ef03eeSJohannes Berg 68707ef03eeSJohannes Berg /* advance to the next channel to be scanned */ 688de2ee84dSMohammed Shafi Shajakhan local->next_scan_state = SCAN_SET_CHANNEL; 68907ef03eeSJohannes Berg } 69007ef03eeSJohannes Berg 691c2b13452SJohannes Berg void ieee80211_scan_work(struct work_struct *work) 6920a51b27eSJohannes Berg { 6930a51b27eSJohannes Berg struct ieee80211_local *local = 6940a51b27eSJohannes Berg container_of(work, struct ieee80211_local, scan_work.work); 695d07bfd8bSJohannes Berg struct ieee80211_sub_if_data *sdata; 6960a51b27eSJohannes Berg unsigned long next_delay = 0; 697d07bfd8bSJohannes Berg bool aborted, hw_scan; 6988789d459SJohannes Berg 699259b62e3SStanislaw Gruszka mutex_lock(&local->mtx); 700259b62e3SStanislaw Gruszka 701e2fd5dbcSJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 702e2fd5dbcSJohannes Berg lockdep_is_held(&local->mtx)); 703d07bfd8bSJohannes Berg 7048a690674SBen Greear /* When scanning on-channel, the first-callback means completed. */ 7058a690674SBen Greear if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 7068a690674SBen Greear aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 7078a690674SBen Greear goto out_complete; 7088a690674SBen Greear } 7098a690674SBen Greear 710259b62e3SStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 7118789d459SJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 712259b62e3SStanislaw Gruszka goto out_complete; 7138789d459SJohannes Berg } 7148789d459SJohannes Berg 715259b62e3SStanislaw Gruszka if (!sdata || !local->scan_req) 716259b62e3SStanislaw Gruszka goto out; 717f3b85252SJohannes Berg 718fbe9c429SHelmut Schaa if (local->scan_req && !local->scanning) { 719f3b85252SJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 720f3b85252SJohannes Berg int rc; 721f3b85252SJohannes Berg 722f3b85252SJohannes Berg local->scan_req = NULL; 723e2fd5dbcSJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 724f3b85252SJohannes Berg 725f3b85252SJohannes Berg rc = __ieee80211_start_scan(sdata, req); 726259b62e3SStanislaw Gruszka if (rc) { 7273aed49efSStanislaw Gruszka /* need to complete scan in cfg80211 */ 7283aed49efSStanislaw Gruszka local->scan_req = req; 729259b62e3SStanislaw Gruszka aborted = true; 730259b62e3SStanislaw Gruszka goto out_complete; 731259b62e3SStanislaw Gruszka } else 732259b62e3SStanislaw Gruszka goto out; 733f3b85252SJohannes Berg } 734f3b85252SJohannes Berg 7355bc75728SJohannes Berg /* 7365bc75728SJohannes Berg * Avoid re-scheduling when the sdata is going away. 7375bc75728SJohannes Berg */ 7389607e6b6SJohannes Berg if (!ieee80211_sdata_running(sdata)) { 739259b62e3SStanislaw Gruszka aborted = true; 740259b62e3SStanislaw Gruszka goto out_complete; 741f3b85252SJohannes Berg } 7420a51b27eSJohannes Berg 743f502d09bSHelmut Schaa /* 744f502d09bSHelmut Schaa * as long as no delay is required advance immediately 745f502d09bSHelmut Schaa * without scheduling a new work 746f502d09bSHelmut Schaa */ 747f502d09bSHelmut Schaa do { 748c29acf20SRajkumar Manoharan if (!ieee80211_sdata_running(sdata)) { 749c29acf20SRajkumar Manoharan aborted = true; 750c29acf20SRajkumar Manoharan goto out_complete; 751c29acf20SRajkumar Manoharan } 752c29acf20SRajkumar Manoharan 753977923b0SHelmut Schaa switch (local->next_scan_state) { 7542fb3f028SHelmut Schaa case SCAN_DECISION: 755e229f844SStanislaw Gruszka /* if no more bands/channels left, complete scan */ 756e229f844SStanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 757e229f844SStanislaw Gruszka aborted = false; 758e229f844SStanislaw Gruszka goto out_complete; 759e229f844SStanislaw Gruszka } 760e229f844SStanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 7610a51b27eSJohannes Berg break; 7622fb3f028SHelmut Schaa case SCAN_SET_CHANNEL: 7632fb3f028SHelmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7642fb3f028SHelmut Schaa break; 7650a51b27eSJohannes Berg case SCAN_SEND_PROBE: 7667d3be3ccSHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 7670a51b27eSJohannes Berg break; 76807ef03eeSJohannes Berg case SCAN_SUSPEND: 76907ef03eeSJohannes Berg ieee80211_scan_state_suspend(local, &next_delay); 770142b9f50SHelmut Schaa break; 77107ef03eeSJohannes Berg case SCAN_RESUME: 77207ef03eeSJohannes Berg ieee80211_scan_state_resume(local, &next_delay); 773142b9f50SHelmut Schaa break; 774cd2bb512SSam Leffler case SCAN_ABORT: 775cd2bb512SSam Leffler aborted = true; 776cd2bb512SSam Leffler goto out_complete; 7770a51b27eSJohannes Berg } 778f502d09bSHelmut Schaa } while (next_delay == 0); 7790a51b27eSJohannes Berg 78042935ecaSLuis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 781d07bfd8bSJohannes Berg goto out; 782259b62e3SStanislaw Gruszka 783259b62e3SStanislaw Gruszka out_complete: 784e229f844SStanislaw Gruszka hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 785d07bfd8bSJohannes Berg __ieee80211_scan_completed(&local->hw, aborted, hw_scan); 786259b62e3SStanislaw Gruszka out: 787259b62e3SStanislaw Gruszka mutex_unlock(&local->mtx); 7880a51b27eSJohannes Berg } 7890a51b27eSJohannes Berg 790c2b13452SJohannes Berg int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 7912a519311SJohannes Berg struct cfg80211_scan_request *req) 7920a51b27eSJohannes Berg { 793f3b85252SJohannes Berg int res; 7940a51b27eSJohannes Berg 795a1699b75SJohannes Berg mutex_lock(&sdata->local->mtx); 796f3b85252SJohannes Berg res = __ieee80211_start_scan(sdata, req); 797a1699b75SJohannes Berg mutex_unlock(&sdata->local->mtx); 7982a519311SJohannes Berg 799f3b85252SJohannes Berg return res; 8000a51b27eSJohannes Berg } 8010a51b27eSJohannes Berg 80234bcf715SStanislaw Gruszka int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 803be4a4b6aSJohannes Berg const u8 *ssid, u8 ssid_len, 804be4a4b6aSJohannes Berg struct ieee80211_channel *chan) 805f3b85252SJohannes Berg { 806f3b85252SJohannes Berg struct ieee80211_local *local = sdata->local; 807f3b85252SJohannes Berg int ret = -EBUSY; 808fb63bc41SGertjan van Wingerde enum ieee80211_band band; 8099116dd01SJohannes Berg 810a1699b75SJohannes Berg mutex_lock(&local->mtx); 811f3b85252SJohannes Berg 812f3b85252SJohannes Berg /* busy scanning */ 813f3b85252SJohannes Berg if (local->scan_req) 814f3b85252SJohannes Berg goto unlock; 815f3b85252SJohannes Berg 816be4a4b6aSJohannes Berg /* fill internal scan request */ 817be4a4b6aSJohannes Berg if (!chan) { 81834bcf715SStanislaw Gruszka int i, max_n; 81934bcf715SStanislaw Gruszka int n_ch = 0; 820be4a4b6aSJohannes Berg 821be4a4b6aSJohannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 822be4a4b6aSJohannes Berg if (!local->hw.wiphy->bands[band]) 823be4a4b6aSJohannes Berg continue; 82434bcf715SStanislaw Gruszka 82534bcf715SStanislaw Gruszka max_n = local->hw.wiphy->bands[band]->n_channels; 82634bcf715SStanislaw Gruszka for (i = 0; i < max_n; i++) { 82734bcf715SStanislaw Gruszka struct ieee80211_channel *tmp_ch = 828be4a4b6aSJohannes Berg &local->hw.wiphy->bands[band]->channels[i]; 82934bcf715SStanislaw Gruszka 83034bcf715SStanislaw Gruszka if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | 83134bcf715SStanislaw Gruszka IEEE80211_CHAN_DISABLED)) 83234bcf715SStanislaw Gruszka continue; 83334bcf715SStanislaw Gruszka 83434bcf715SStanislaw Gruszka local->int_scan_req->channels[n_ch] = tmp_ch; 83534bcf715SStanislaw Gruszka n_ch++; 836be4a4b6aSJohannes Berg } 837be4a4b6aSJohannes Berg } 838be4a4b6aSJohannes Berg 83934bcf715SStanislaw Gruszka if (WARN_ON_ONCE(n_ch == 0)) 84034bcf715SStanislaw Gruszka goto unlock; 84134bcf715SStanislaw Gruszka 84234bcf715SStanislaw Gruszka local->int_scan_req->n_channels = n_ch; 843be4a4b6aSJohannes Berg } else { 84434bcf715SStanislaw Gruszka if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | 84534bcf715SStanislaw Gruszka IEEE80211_CHAN_DISABLED))) 84634bcf715SStanislaw Gruszka goto unlock; 84734bcf715SStanislaw Gruszka 848be4a4b6aSJohannes Berg local->int_scan_req->channels[0] = chan; 849be4a4b6aSJohannes Berg local->int_scan_req->n_channels = 1; 850be4a4b6aSJohannes Berg } 851be4a4b6aSJohannes Berg 852be4a4b6aSJohannes Berg local->int_scan_req->ssids = &local->scan_ssid; 853be4a4b6aSJohannes Berg local->int_scan_req->n_ssids = 1; 8545ba63533SJohannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 8555ba63533SJohannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 856f3b85252SJohannes Berg 8575ba63533SJohannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 858f3b85252SJohannes Berg unlock: 859a1699b75SJohannes Berg mutex_unlock(&local->mtx); 860f3b85252SJohannes Berg return ret; 8610a51b27eSJohannes Berg } 8625bb644a0SJohannes Berg 8634136c422SStanislaw Gruszka /* 8644136c422SStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 8654136c422SStanislaw Gruszka */ 8665bb644a0SJohannes Berg void ieee80211_scan_cancel(struct ieee80211_local *local) 8675bb644a0SJohannes Berg { 8685bb644a0SJohannes Berg /* 869b856439bSEliad Peller * We are canceling software scan, or deferred scan that was not 8704136c422SStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 8714136c422SStanislaw Gruszka * 8724136c422SStanislaw Gruszka * Regarding hardware scan: 8734136c422SStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 8744136c422SStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 8754136c422SStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 8764136c422SStanislaw Gruszka * driver which can use local->hw_scan_req 8774136c422SStanislaw Gruszka * 8784136c422SStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 8794136c422SStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 8804136c422SStanislaw Gruszka * 881b856439bSEliad Peller * Hence we only call the cancel_hw_scan() callback, but the low-level 882b856439bSEliad Peller * driver is still responsible for calling ieee80211_scan_completed() 883b856439bSEliad Peller * after the scan was completed/aborted. 8845bb644a0SJohannes Berg */ 8854136c422SStanislaw Gruszka 886a1699b75SJohannes Berg mutex_lock(&local->mtx); 887b856439bSEliad Peller if (!local->scan_req) 888b856439bSEliad Peller goto out; 889b856439bSEliad Peller 890b856439bSEliad Peller if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 891b856439bSEliad Peller if (local->ops->cancel_hw_scan) 892e2fd5dbcSJohannes Berg drv_cancel_hw_scan(local, 893e2fd5dbcSJohannes Berg rcu_dereference_protected(local->scan_sdata, 894e2fd5dbcSJohannes Berg lockdep_is_held(&local->mtx))); 895b856439bSEliad Peller goto out; 896b856439bSEliad Peller } 897b856439bSEliad Peller 898d07bfd8bSJohannes Berg /* 899d07bfd8bSJohannes Berg * If the work is currently running, it must be blocked on 900d07bfd8bSJohannes Berg * the mutex, but we'll set scan_sdata = NULL and it'll 901d07bfd8bSJohannes Berg * simply exit once it acquires the mutex. 902d07bfd8bSJohannes Berg */ 903d07bfd8bSJohannes Berg cancel_delayed_work(&local->scan_work); 904d07bfd8bSJohannes Berg /* and clean up */ 905d07bfd8bSJohannes Berg __ieee80211_scan_completed(&local->hw, true, false); 906b856439bSEliad Peller out: 907d07bfd8bSJohannes Berg mutex_unlock(&local->mtx); 9085bb644a0SJohannes Berg } 90979f460caSLuciano Coelho 91079f460caSLuciano Coelho int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 91179f460caSLuciano Coelho struct cfg80211_sched_scan_request *req) 91279f460caSLuciano Coelho { 91379f460caSLuciano Coelho struct ieee80211_local *local = sdata->local; 914bca1e29fSDavid Spinadel struct ieee80211_sched_scan_ies sched_scan_ies = {}; 915c604b9f2SJohannes Berg int ret, i, iebufsz; 916c604b9f2SJohannes Berg 917c604b9f2SJohannes Berg iebufsz = 2 + IEEE80211_MAX_SSID_LEN + 918c604b9f2SJohannes Berg local->scan_ies_len + req->ie_len; 91979f460caSLuciano Coelho 9205260a5b2SJohannes Berg mutex_lock(&local->mtx); 92179f460caSLuciano Coelho 9225260a5b2SJohannes Berg if (rcu_access_pointer(local->sched_scan_sdata)) { 92379f460caSLuciano Coelho ret = -EBUSY; 92479f460caSLuciano Coelho goto out; 92579f460caSLuciano Coelho } 92679f460caSLuciano Coelho 92779f460caSLuciano Coelho if (!local->ops->sched_scan_start) { 92879f460caSLuciano Coelho ret = -ENOTSUPP; 92979f460caSLuciano Coelho goto out; 93079f460caSLuciano Coelho } 93179f460caSLuciano Coelho 93279f460caSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 933d811b3d5SArik Nemtsov if (!local->hw.wiphy->bands[i]) 934d811b3d5SArik Nemtsov continue; 935d811b3d5SArik Nemtsov 936c604b9f2SJohannes Berg sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); 93730dd3edfSJohannes Berg if (!sched_scan_ies.ie[i]) { 93879f460caSLuciano Coelho ret = -ENOMEM; 93979f460caSLuciano Coelho goto out_free; 94079f460caSLuciano Coelho } 94179f460caSLuciano Coelho 94230dd3edfSJohannes Berg sched_scan_ies.len[i] = 94330dd3edfSJohannes Berg ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], 944c604b9f2SJohannes Berg iebufsz, req->ie, req->ie_len, 945c604b9f2SJohannes Berg i, (u32) -1, 0); 94679f460caSLuciano Coelho } 94779f460caSLuciano Coelho 94830dd3edfSJohannes Berg ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 94930dd3edfSJohannes Berg if (ret == 0) 9505260a5b2SJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, sdata); 95179f460caSLuciano Coelho 95279f460caSLuciano Coelho out_free: 95379f460caSLuciano Coelho while (i > 0) 95430dd3edfSJohannes Berg kfree(sched_scan_ies.ie[--i]); 95579f460caSLuciano Coelho out: 9565260a5b2SJohannes Berg mutex_unlock(&local->mtx); 95779f460caSLuciano Coelho return ret; 95879f460caSLuciano Coelho } 95979f460caSLuciano Coelho 96085a9994aSLuciano Coelho int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) 96179f460caSLuciano Coelho { 96279f460caSLuciano Coelho struct ieee80211_local *local = sdata->local; 96330dd3edfSJohannes Berg int ret = 0; 96479f460caSLuciano Coelho 9655260a5b2SJohannes Berg mutex_lock(&local->mtx); 96679f460caSLuciano Coelho 96779f460caSLuciano Coelho if (!local->ops->sched_scan_stop) { 96879f460caSLuciano Coelho ret = -ENOTSUPP; 96979f460caSLuciano Coelho goto out; 97079f460caSLuciano Coelho } 97179f460caSLuciano Coelho 97230dd3edfSJohannes Berg if (rcu_access_pointer(local->sched_scan_sdata)) 97379f460caSLuciano Coelho drv_sched_scan_stop(local, sdata); 97430dd3edfSJohannes Berg 97579f460caSLuciano Coelho out: 9765260a5b2SJohannes Berg mutex_unlock(&local->mtx); 97779f460caSLuciano Coelho 97879f460caSLuciano Coelho return ret; 97979f460caSLuciano Coelho } 98079f460caSLuciano Coelho 98179f460caSLuciano Coelho void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 98279f460caSLuciano Coelho { 98379f460caSLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 98479f460caSLuciano Coelho 98579f460caSLuciano Coelho trace_api_sched_scan_results(local); 98679f460caSLuciano Coelho 98779f460caSLuciano Coelho cfg80211_sched_scan_results(hw->wiphy); 98879f460caSLuciano Coelho } 98979f460caSLuciano Coelho EXPORT_SYMBOL(ieee80211_sched_scan_results); 99079f460caSLuciano Coelho 99185a9994aSLuciano Coelho void ieee80211_sched_scan_stopped_work(struct work_struct *work) 99285a9994aSLuciano Coelho { 99385a9994aSLuciano Coelho struct ieee80211_local *local = 99485a9994aSLuciano Coelho container_of(work, struct ieee80211_local, 99585a9994aSLuciano Coelho sched_scan_stopped_work); 99685a9994aSLuciano Coelho 99785a9994aSLuciano Coelho mutex_lock(&local->mtx); 99885a9994aSLuciano Coelho 9995260a5b2SJohannes Berg if (!rcu_access_pointer(local->sched_scan_sdata)) { 100085a9994aSLuciano Coelho mutex_unlock(&local->mtx); 100185a9994aSLuciano Coelho return; 100285a9994aSLuciano Coelho } 100385a9994aSLuciano Coelho 10045260a5b2SJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, NULL); 100585a9994aSLuciano Coelho 100685a9994aSLuciano Coelho mutex_unlock(&local->mtx); 100785a9994aSLuciano Coelho 100885a9994aSLuciano Coelho cfg80211_sched_scan_stopped(local->hw.wiphy); 100985a9994aSLuciano Coelho } 101085a9994aSLuciano Coelho 101179f460caSLuciano Coelho void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 101279f460caSLuciano Coelho { 101379f460caSLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 101479f460caSLuciano Coelho 101579f460caSLuciano Coelho trace_api_sched_scan_stopped(local); 101679f460caSLuciano Coelho 101785a9994aSLuciano Coelho ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); 101879f460caSLuciano Coelho } 101979f460caSLuciano Coelho EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1020