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) 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 107fcff4f10SPaul Stewart if (elems->parse_error) { 108fcff4f10SPaul Stewart if (beacon) 109fcff4f10SPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 110fcff4f10SPaul Stewart else 111fcff4f10SPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 112fcff4f10SPaul Stewart } else { 113fcff4f10SPaul Stewart if (beacon) 114fcff4f10SPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 115fcff4f10SPaul Stewart else 116fcff4f10SPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 1175484e237SJohannes Berg } 1185484e237SJohannes Berg 119fcff4f10SPaul Stewart /* save the ERP value so that it is available at association time */ 120fcff4f10SPaul Stewart if (elems->erp_info && elems->erp_info_len >= 1 && 121fcff4f10SPaul Stewart (!elems->parse_error || 122fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 123fcff4f10SPaul Stewart bss->erp_value = elems->erp_info[0]; 124fcff4f10SPaul Stewart bss->has_erp_value = true; 125fcff4f10SPaul Stewart if (!elems->parse_error) 126fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_ERP; 127fcff4f10SPaul Stewart } 128fcff4f10SPaul Stewart 129fcff4f10SPaul Stewart if (elems->tim && (!elems->parse_error || 130fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_DTIM))) { 1315484e237SJohannes Berg struct ieee80211_tim_ie *tim_ie = 1325484e237SJohannes Berg (struct ieee80211_tim_ie *)elems->tim; 1335484e237SJohannes Berg bss->dtim_period = tim_ie->dtim_period; 134fcff4f10SPaul Stewart if (!elems->parse_error) 135fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_DTIM; 1365484e237SJohannes Berg } 1375484e237SJohannes Berg 138e5b900d2SJohannes Berg /* If the beacon had no TIM IE, or it was invalid, use 1 */ 139e5b900d2SJohannes Berg if (beacon && !bss->dtim_period) 140e5b900d2SJohannes Berg bss->dtim_period = 1; 141e5b900d2SJohannes Berg 142f0b058b6SStanislaw Gruszka /* replace old supported rates if we get new values */ 143fcff4f10SPaul Stewart if (!elems->parse_error || 144fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 145f0b058b6SStanislaw Gruszka srlen = 0; 1465484e237SJohannes Berg if (elems->supp_rates) { 147f0b058b6SStanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES; 1485484e237SJohannes Berg if (clen > elems->supp_rates_len) 1495484e237SJohannes Berg clen = elems->supp_rates_len; 150f0b058b6SStanislaw Gruszka memcpy(bss->supp_rates, elems->supp_rates, clen); 151f0b058b6SStanislaw Gruszka srlen += clen; 1525484e237SJohannes Berg } 1535484e237SJohannes Berg if (elems->ext_supp_rates) { 154f0b058b6SStanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES - srlen; 1555484e237SJohannes Berg if (clen > elems->ext_supp_rates_len) 1565484e237SJohannes Berg clen = elems->ext_supp_rates_len; 157fcff4f10SPaul Stewart memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 158fcff4f10SPaul Stewart clen); 159f0b058b6SStanislaw Gruszka srlen += clen; 1605484e237SJohannes Berg } 161fcff4f10SPaul Stewart if (srlen) { 162f0b058b6SStanislaw Gruszka bss->supp_rates_len = srlen; 163fcff4f10SPaul Stewart if (!elems->parse_error) 164fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_RATES; 165fcff4f10SPaul Stewart } 166fcff4f10SPaul Stewart } 1675484e237SJohannes Berg 168fcff4f10SPaul Stewart if (!elems->parse_error || 169fcff4f10SPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 1705484e237SJohannes Berg bss->wmm_used = elems->wmm_param || elems->wmm_info; 171ab13315aSKalle Valo bss->uapsd_supported = is_uapsd_supported(elems); 172fcff4f10SPaul Stewart if (!elems->parse_error) 173fcff4f10SPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_WMM; 174fcff4f10SPaul Stewart } 1755484e237SJohannes Berg 1765484e237SJohannes Berg if (!beacon) 1775484e237SJohannes Berg bss->last_probe_resp = jiffies; 1785484e237SJohannes Berg 1795484e237SJohannes Berg return bss; 1805484e237SJohannes Berg } 1810a51b27eSJohannes Berg 18298c8fccfSJohannes Berg ieee80211_rx_result 183f1d58c25SJohannes Berg ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 18498c8fccfSJohannes Berg { 185f1d58c25SJohannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 18698c8fccfSJohannes Berg struct ieee80211_mgmt *mgmt; 187c2b13452SJohannes Berg struct ieee80211_bss *bss; 18898c8fccfSJohannes Berg u8 *elements; 18998c8fccfSJohannes Berg struct ieee80211_channel *channel; 19098c8fccfSJohannes Berg size_t baselen; 19198c8fccfSJohannes Berg int freq; 19298c8fccfSJohannes Berg __le16 fc; 19398c8fccfSJohannes Berg bool presp, beacon = false; 19498c8fccfSJohannes Berg struct ieee802_11_elems elems; 19598c8fccfSJohannes Berg 19698c8fccfSJohannes Berg if (skb->len < 2) 19798c8fccfSJohannes Berg return RX_DROP_UNUSABLE; 19898c8fccfSJohannes Berg 19998c8fccfSJohannes Berg mgmt = (struct ieee80211_mgmt *) skb->data; 20098c8fccfSJohannes Berg fc = mgmt->frame_control; 20198c8fccfSJohannes Berg 20298c8fccfSJohannes Berg if (ieee80211_is_ctl(fc)) 20398c8fccfSJohannes Berg return RX_CONTINUE; 20498c8fccfSJohannes Berg 20598c8fccfSJohannes Berg if (skb->len < 24) 206306fe938SLuciano Coelho return RX_CONTINUE; 20798c8fccfSJohannes Berg 20898c8fccfSJohannes Berg presp = ieee80211_is_probe_resp(fc); 20998c8fccfSJohannes Berg if (presp) { 21098c8fccfSJohannes Berg /* ignore ProbeResp to foreign address */ 211888d04dfSFelix Fietkau if (compare_ether_addr(mgmt->da, sdata->vif.addr)) 21298c8fccfSJohannes Berg return RX_DROP_MONITOR; 21398c8fccfSJohannes Berg 21498c8fccfSJohannes Berg presp = true; 21598c8fccfSJohannes Berg elements = mgmt->u.probe_resp.variable; 21698c8fccfSJohannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 21798c8fccfSJohannes Berg } else { 21898c8fccfSJohannes Berg beacon = ieee80211_is_beacon(fc); 21998c8fccfSJohannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 22098c8fccfSJohannes Berg elements = mgmt->u.beacon.variable; 22198c8fccfSJohannes Berg } 22298c8fccfSJohannes Berg 22398c8fccfSJohannes Berg if (!presp && !beacon) 22498c8fccfSJohannes Berg return RX_CONTINUE; 22598c8fccfSJohannes Berg 22698c8fccfSJohannes Berg if (baselen > skb->len) 22798c8fccfSJohannes Berg return RX_DROP_MONITOR; 22898c8fccfSJohannes Berg 22998c8fccfSJohannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 23098c8fccfSJohannes Berg 23198c8fccfSJohannes Berg if (elems.ds_params && elems.ds_params_len == 1) 23259eb21a6SBruno Randolf freq = ieee80211_channel_to_frequency(elems.ds_params[0], 23359eb21a6SBruno Randolf rx_status->band); 23498c8fccfSJohannes Berg else 23598c8fccfSJohannes Berg freq = rx_status->freq; 23698c8fccfSJohannes Berg 23798c8fccfSJohannes Berg channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 23898c8fccfSJohannes Berg 23998c8fccfSJohannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 24098c8fccfSJohannes Berg return RX_DROP_MONITOR; 24198c8fccfSJohannes Berg 24298c8fccfSJohannes Berg bss = ieee80211_bss_info_update(sdata->local, rx_status, 24398c8fccfSJohannes Berg mgmt, skb->len, &elems, 2442a519311SJohannes Berg channel, beacon); 245d048e503SJouni Malinen if (bss) 24698c8fccfSJohannes Berg ieee80211_rx_bss_put(sdata->local, bss); 24798c8fccfSJohannes Berg 24807ef03eeSJohannes Berg if (channel == sdata->local->oper_channel) 249b23b025fSBen Greear return RX_CONTINUE; 250b23b025fSBen Greear 25198c8fccfSJohannes Berg dev_kfree_skb(skb); 25298c8fccfSJohannes Berg return RX_QUEUED; 25398c8fccfSJohannes Berg } 25498c8fccfSJohannes Berg 2554d36ec58SJohannes Berg /* return false if no more work */ 2564d36ec58SJohannes Berg static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2574d36ec58SJohannes Berg { 2584d36ec58SJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2594d36ec58SJohannes Berg enum ieee80211_band band; 2604d36ec58SJohannes Berg int i, ielen, n_chans; 2614d36ec58SJohannes Berg 2624d36ec58SJohannes Berg do { 2634d36ec58SJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2644d36ec58SJohannes Berg return false; 2654d36ec58SJohannes Berg 2664d36ec58SJohannes Berg band = local->hw_scan_band; 2674d36ec58SJohannes Berg n_chans = 0; 2684d36ec58SJohannes Berg for (i = 0; i < req->n_channels; i++) { 2694d36ec58SJohannes Berg if (req->channels[i]->band == band) { 2704d36ec58SJohannes Berg local->hw_scan_req->channels[n_chans] = 2714d36ec58SJohannes Berg req->channels[i]; 2724d36ec58SJohannes Berg n_chans++; 2734d36ec58SJohannes Berg } 2744d36ec58SJohannes Berg } 2754d36ec58SJohannes Berg 2764d36ec58SJohannes Berg local->hw_scan_band++; 2774d36ec58SJohannes Berg } while (!n_chans); 2784d36ec58SJohannes Berg 2794d36ec58SJohannes Berg local->hw_scan_req->n_channels = n_chans; 2804d36ec58SJohannes Berg 2814d36ec58SJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 2828ee31080SJohannes Berg req->ie, req->ie_len, band, 28385a237feSJohannes Berg req->rates[band], 0); 2844d36ec58SJohannes Berg local->hw_scan_req->ie_len = ielen; 285dcd83976SJohannes Berg local->hw_scan_req->no_cck = req->no_cck; 2864d36ec58SJohannes Berg 2874d36ec58SJohannes Berg return true; 2884d36ec58SJohannes Berg } 2894d36ec58SJohannes Berg 290d07bfd8bSJohannes Berg static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, 291e229f844SStanislaw Gruszka bool was_hw_scan) 292f3b85252SJohannes Berg { 293f3b85252SJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 294f3b85252SJohannes Berg 295e229f844SStanislaw Gruszka lockdep_assert_held(&local->mtx); 296f3b85252SJohannes Berg 2976d3560d4SJohannes Berg /* 2986d3560d4SJohannes Berg * It's ok to abort a not-yet-running scan (that 2996d3560d4SJohannes Berg * we have one at all will be verified by checking 3006d3560d4SJohannes Berg * local->scan_req next), but not to complete it 3016d3560d4SJohannes Berg * successfully. 3026d3560d4SJohannes Berg */ 3036d3560d4SJohannes Berg if (WARN_ON(!local->scanning && !aborted)) 3046d3560d4SJohannes Berg aborted = true; 305f3b85252SJohannes Berg 306e229f844SStanislaw Gruszka if (WARN_ON(!local->scan_req)) 307d07bfd8bSJohannes Berg return; 308f3b85252SJohannes Berg 3094d36ec58SJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 3106eb11a9aSStanislaw Gruszka int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req); 3116eb11a9aSStanislaw Gruszka if (rc == 0) 312d07bfd8bSJohannes Berg return; 3134d36ec58SJohannes Berg } 3144d36ec58SJohannes Berg 3154d36ec58SJohannes Berg kfree(local->hw_scan_req); 3164d36ec58SJohannes Berg local->hw_scan_req = NULL; 317f3b85252SJohannes Berg 3185ba63533SJohannes Berg if (local->scan_req != local->int_scan_req) 3192a519311SJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 3202a519311SJohannes Berg local->scan_req = NULL; 32115db0b7fSJohannes Berg local->scan_sdata = NULL; 3222a519311SJohannes Berg 323fbe9c429SHelmut Schaa local->scanning = 0; 32458905ca5SJohannes Berg local->scan_channel = NULL; 325f3b85252SJohannes Berg 32659bdf3b0SBen Greear /* Set power back to normal operating levels. */ 32759bdf3b0SBen Greear ieee80211_hw_config(local, 0); 328b23b025fSBen Greear 329b23b025fSBen Greear if (!was_hw_scan) { 330b23b025fSBen Greear ieee80211_configure_filter(local); 331b23b025fSBen Greear drv_sw_scan_complete(local); 332e76aadc5SJohannes Berg ieee80211_offchannel_return(local, true); 333b23b025fSBen Greear } 334b23b025fSBen Greear 3355cff20e6SJohannes Berg ieee80211_recalc_idle(local); 336e229f844SStanislaw Gruszka 3370a51b27eSJohannes Berg ieee80211_mlme_notify_scan_completed(local); 33846900298SJohannes Berg ieee80211_ibss_notify_scan_completed(local); 339472dbc45SJohannes Berg ieee80211_mesh_notify_scan_completed(local); 34081ac3462SJohannes Berg ieee80211_queue_work(&local->hw, &local->work_work); 3410a51b27eSJohannes Berg } 3428789d459SJohannes Berg 3438789d459SJohannes Berg void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 3448789d459SJohannes Berg { 3458789d459SJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3468789d459SJohannes Berg 3478789d459SJohannes Berg trace_api_scan_completed(local, aborted); 3488789d459SJohannes Berg 3498789d459SJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3508789d459SJohannes Berg if (aborted) 3518789d459SJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3528789d459SJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3538789d459SJohannes Berg } 3540a51b27eSJohannes Berg EXPORT_SYMBOL(ieee80211_scan_completed); 3550a51b27eSJohannes Berg 356f3b85252SJohannes Berg static int ieee80211_start_sw_scan(struct ieee80211_local *local) 357f3b85252SJohannes Berg { 358f3b85252SJohannes Berg /* 359f3b85252SJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 360f3b85252SJohannes Berg * scanning instead. First send a nullfunc frame with power save 361f3b85252SJohannes Berg * bit on so that AP will buffer the frames for us while we are not 362f3b85252SJohannes Berg * listening, then send probe requests to each channel and wait for 363f3b85252SJohannes Berg * the responses. After all channels are scanned, tune back to the 364f3b85252SJohannes Berg * original channel and send a nullfunc frame with power save bit 365f3b85252SJohannes Berg * off to trigger the AP to send us all the buffered frames. 366f3b85252SJohannes Berg * 367f3b85252SJohannes Berg * Note that while local->sw_scanning is true everything else but 368f3b85252SJohannes Berg * nullfunc frames and probe requests will be dropped in 369f3b85252SJohannes Berg * ieee80211_tx_h_check_assoc(). 370f3b85252SJohannes Berg */ 37124487981SJohannes Berg drv_sw_scan_start(local); 372f3b85252SJohannes Berg 373*de312db3SRajkumar Manoharan local->leave_oper_channel_time = jiffies; 374977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 375f3b85252SJohannes Berg local->scan_channel_idx = 0; 376f3b85252SJohannes Berg 37707ef03eeSJohannes Berg ieee80211_offchannel_stop_vifs(local, true); 378a80f7c0bSJohannes Berg 3793ac64beeSJohannes Berg ieee80211_configure_filter(local); 380f3b85252SJohannes Berg 38159bdf3b0SBen Greear /* We need to set power level at maximum rate for scanning. */ 38259bdf3b0SBen Greear ieee80211_hw_config(local, 0); 38359bdf3b0SBen Greear 38442935ecaSLuis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 38507ef03eeSJohannes Berg &local->scan_work, 0); 386f3b85252SJohannes Berg 387f3b85252SJohannes Berg return 0; 388f3b85252SJohannes Berg } 389f3b85252SJohannes Berg 390f3b85252SJohannes Berg 391f3b85252SJohannes Berg static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 392f3b85252SJohannes Berg struct cfg80211_scan_request *req) 393f3b85252SJohannes Berg { 394f3b85252SJohannes Berg struct ieee80211_local *local = sdata->local; 395f3b85252SJohannes Berg int rc; 396f3b85252SJohannes Berg 397e229f844SStanislaw Gruszka lockdep_assert_held(&local->mtx); 398e229f844SStanislaw Gruszka 399f3b85252SJohannes Berg if (local->scan_req) 400f3b85252SJohannes Berg return -EBUSY; 401f3b85252SJohannes Berg 4026e7e6213SJohn W. Linville if (!list_empty(&local->work_list)) { 4036e7e6213SJohn W. Linville /* wait for the work to finish/time out */ 404c0ce77b8SJohannes Berg local->scan_req = req; 405c0ce77b8SJohannes Berg local->scan_sdata = sdata; 406c0ce77b8SJohannes Berg return 0; 407c0ce77b8SJohannes Berg } 408c0ce77b8SJohannes Berg 409f3b85252SJohannes Berg if (local->ops->hw_scan) { 410f3b85252SJohannes Berg u8 *ies; 411f3b85252SJohannes Berg 4124d36ec58SJohannes Berg local->hw_scan_req = kmalloc( 4134d36ec58SJohannes Berg sizeof(*local->hw_scan_req) + 4144d36ec58SJohannes Berg req->n_channels * sizeof(req->channels[0]) + 4154d36ec58SJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 4164d36ec58SJohannes Berg req->ie_len, GFP_KERNEL); 4174d36ec58SJohannes Berg if (!local->hw_scan_req) 418f3b85252SJohannes Berg return -ENOMEM; 419f3b85252SJohannes Berg 4204d36ec58SJohannes Berg local->hw_scan_req->ssids = req->ssids; 4214d36ec58SJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 4224d36ec58SJohannes Berg ies = (u8 *)local->hw_scan_req + 4234d36ec58SJohannes Berg sizeof(*local->hw_scan_req) + 4244d36ec58SJohannes Berg req->n_channels * sizeof(req->channels[0]); 4254d36ec58SJohannes Berg local->hw_scan_req->ie = ies; 4264d36ec58SJohannes Berg 4274d36ec58SJohannes Berg local->hw_scan_band = 0; 4286e7e6213SJohn W. Linville 4296e7e6213SJohn W. Linville /* 4306e7e6213SJohn W. Linville * After allocating local->hw_scan_req, we must 4316e7e6213SJohn W. Linville * go through until ieee80211_prep_hw_scan(), so 4326e7e6213SJohn W. Linville * anything that might be changed here and leave 4336e7e6213SJohn W. Linville * this function early must not go after this 4346e7e6213SJohn W. Linville * allocation. 4356e7e6213SJohn W. Linville */ 436f3b85252SJohannes Berg } 437f3b85252SJohannes Berg 438f3b85252SJohannes Berg local->scan_req = req; 439f3b85252SJohannes Berg local->scan_sdata = sdata; 440f3b85252SJohannes Berg 441f3b85252SJohannes Berg if (local->ops->hw_scan) 442fbe9c429SHelmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 443f3b85252SJohannes Berg else 444fbe9c429SHelmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 4456e7e6213SJohn W. Linville 4465cff20e6SJohannes Berg ieee80211_recalc_idle(local); 447f3b85252SJohannes Berg 4484d36ec58SJohannes Berg if (local->ops->hw_scan) { 4494d36ec58SJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 450a060bbfeSJohannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 4514d36ec58SJohannes Berg } else 452f3b85252SJohannes Berg rc = ieee80211_start_sw_scan(local); 453f3b85252SJohannes Berg 454f3b85252SJohannes Berg if (rc) { 4554d36ec58SJohannes Berg kfree(local->hw_scan_req); 4564d36ec58SJohannes Berg local->hw_scan_req = NULL; 457fbe9c429SHelmut Schaa local->scanning = 0; 458f3b85252SJohannes Berg 4595cff20e6SJohannes Berg ieee80211_recalc_idle(local); 4605cff20e6SJohannes Berg 461f3b85252SJohannes Berg local->scan_req = NULL; 462f3b85252SJohannes Berg local->scan_sdata = NULL; 463f3b85252SJohannes Berg } 464f3b85252SJohannes Berg 465f3b85252SJohannes Berg return rc; 466f3b85252SJohannes Berg } 467f3b85252SJohannes Berg 468df13cce5SHelmut Schaa static unsigned long 469df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 470df13cce5SHelmut Schaa { 471df13cce5SHelmut Schaa /* 472df13cce5SHelmut Schaa * TODO: channel switching also consumes quite some time, 473df13cce5SHelmut Schaa * add that delay as well to get a better estimation 474df13cce5SHelmut Schaa */ 475df13cce5SHelmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 476df13cce5SHelmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 477df13cce5SHelmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 478df13cce5SHelmut Schaa } 479df13cce5SHelmut Schaa 480e229f844SStanislaw Gruszka static void ieee80211_scan_state_decision(struct ieee80211_local *local, 4812fb3f028SHelmut Schaa unsigned long *next_delay) 4822fb3f028SHelmut Schaa { 483142b9f50SHelmut Schaa bool associated = false; 484df13cce5SHelmut Schaa bool tx_empty = true; 485df13cce5SHelmut Schaa bool bad_latency; 486df13cce5SHelmut Schaa bool listen_int_exceeded; 487df13cce5SHelmut Schaa unsigned long min_beacon_int = 0; 488142b9f50SHelmut Schaa struct ieee80211_sub_if_data *sdata; 489df13cce5SHelmut Schaa struct ieee80211_channel *next_chan; 490142b9f50SHelmut Schaa 491df13cce5SHelmut Schaa /* 492df13cce5SHelmut Schaa * check if at least one STA interface is associated, 493df13cce5SHelmut Schaa * check if at least one STA interface has pending tx frames 494df13cce5SHelmut Schaa * and grab the lowest used beacon interval 495df13cce5SHelmut Schaa */ 496142b9f50SHelmut Schaa mutex_lock(&local->iflist_mtx); 497142b9f50SHelmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 4989607e6b6SJohannes Berg if (!ieee80211_sdata_running(sdata)) 499142b9f50SHelmut Schaa continue; 500142b9f50SHelmut Schaa 501142b9f50SHelmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 502142b9f50SHelmut Schaa if (sdata->u.mgd.associated) { 503142b9f50SHelmut Schaa associated = true; 504df13cce5SHelmut Schaa 505df13cce5SHelmut Schaa if (sdata->vif.bss_conf.beacon_int < 506df13cce5SHelmut Schaa min_beacon_int || min_beacon_int == 0) 507df13cce5SHelmut Schaa min_beacon_int = 508df13cce5SHelmut Schaa sdata->vif.bss_conf.beacon_int; 509df13cce5SHelmut Schaa 510df13cce5SHelmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 511df13cce5SHelmut Schaa tx_empty = false; 512142b9f50SHelmut Schaa break; 513142b9f50SHelmut Schaa } 514142b9f50SHelmut Schaa } 515142b9f50SHelmut Schaa } 516df13cce5SHelmut Schaa } 517142b9f50SHelmut Schaa mutex_unlock(&local->iflist_mtx); 518142b9f50SHelmut Schaa 519b23b025fSBen Greear next_chan = local->scan_req->channels[local->scan_channel_idx]; 520b23b025fSBen Greear 521142b9f50SHelmut Schaa /* 522142b9f50SHelmut Schaa * we're currently scanning a different channel, let's 523df13cce5SHelmut Schaa * see if we can scan another channel without interfering 524df13cce5SHelmut Schaa * with the current traffic situation. 525df13cce5SHelmut Schaa * 526df13cce5SHelmut Schaa * Since we don't know if the AP has pending frames for us 527df13cce5SHelmut Schaa * we can only check for our tx queues and use the current 528df13cce5SHelmut Schaa * pm_qos requirements for rx. Hence, if no tx traffic occurs 529df13cce5SHelmut Schaa * at all we will scan as many channels in a row as the pm_qos 530df13cce5SHelmut Schaa * latency allows us to. Additionally we also check for the 531df13cce5SHelmut Schaa * currently negotiated listen interval to prevent losing 532df13cce5SHelmut Schaa * frames unnecessarily. 533df13cce5SHelmut Schaa * 534df13cce5SHelmut Schaa * Otherwise switch back to the operating channel. 535142b9f50SHelmut Schaa */ 536df13cce5SHelmut Schaa 537df13cce5SHelmut Schaa bad_latency = time_after(jiffies + 538df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(next_chan), 539df13cce5SHelmut Schaa local->leave_oper_channel_time + 540f8965467SLinus Torvalds usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); 541df13cce5SHelmut Schaa 542df13cce5SHelmut Schaa listen_int_exceeded = time_after(jiffies + 543df13cce5SHelmut Schaa ieee80211_scan_get_channel_time(next_chan), 544df13cce5SHelmut Schaa local->leave_oper_channel_time + 545df13cce5SHelmut Schaa usecs_to_jiffies(min_beacon_int * 1024) * 546df13cce5SHelmut Schaa local->hw.conf.listen_interval); 547df13cce5SHelmut Schaa 54807ef03eeSJohannes Berg if (associated && (!tx_empty || bad_latency || listen_int_exceeded)) 54907ef03eeSJohannes Berg local->next_scan_state = SCAN_SUSPEND; 550142b9f50SHelmut Schaa else 551977923b0SHelmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 552142b9f50SHelmut Schaa 553142b9f50SHelmut Schaa *next_delay = 0; 5542fb3f028SHelmut Schaa } 5552fb3f028SHelmut Schaa 5562fb3f028SHelmut Schaa static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 5577d3be3ccSHelmut Schaa unsigned long *next_delay) 5587d3be3ccSHelmut Schaa { 5597d3be3ccSHelmut Schaa int skip; 5607d3be3ccSHelmut Schaa struct ieee80211_channel *chan; 5617d3be3ccSHelmut Schaa 5627d3be3ccSHelmut Schaa skip = 0; 5637d3be3ccSHelmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 5647d3be3ccSHelmut Schaa 5657d3be3ccSHelmut Schaa local->scan_channel = chan; 566b23b025fSBen Greear 567584991dcSJohannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 5687d3be3ccSHelmut Schaa skip = 1; 5697d3be3ccSHelmut Schaa 5707d3be3ccSHelmut Schaa /* advance state machine to next channel/band */ 5717d3be3ccSHelmut Schaa local->scan_channel_idx++; 5727d3be3ccSHelmut Schaa 5730ee9c13cSHelmut Schaa if (skip) { 5740ee9c13cSHelmut Schaa /* if we skip this channel return to the decision state */ 5750ee9c13cSHelmut Schaa local->next_scan_state = SCAN_DECISION; 5762fb3f028SHelmut Schaa return; 5770ee9c13cSHelmut Schaa } 5787d3be3ccSHelmut Schaa 5797d3be3ccSHelmut Schaa /* 5807d3be3ccSHelmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 5817d3be3ccSHelmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 5827d3be3ccSHelmut Schaa * but it waits for the probe delay or until a frame is 5837d3be3ccSHelmut Schaa * received - and the received frame would update the NAV). 5847d3be3ccSHelmut Schaa * For now, we do not support waiting until a frame is 5857d3be3ccSHelmut Schaa * received. 5867d3be3ccSHelmut Schaa * 5877d3be3ccSHelmut Schaa * In any case, it is not necessary for a passive scan. 5887d3be3ccSHelmut Schaa */ 5897d3be3ccSHelmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 5907d3be3ccSHelmut Schaa !local->scan_req->n_ssids) { 5917d3be3ccSHelmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 592977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 5932fb3f028SHelmut Schaa return; 5947d3be3ccSHelmut Schaa } 5957d3be3ccSHelmut Schaa 5962fb3f028SHelmut Schaa /* active scan, send probes */ 5977d3be3ccSHelmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 598977923b0SHelmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 5997d3be3ccSHelmut Schaa } 6007d3be3ccSHelmut Schaa 6017d3be3ccSHelmut Schaa static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 6027d3be3ccSHelmut Schaa unsigned long *next_delay) 6037d3be3ccSHelmut Schaa { 6047d3be3ccSHelmut Schaa int i; 6057d3be3ccSHelmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 60685a237feSJohannes Berg enum ieee80211_band band = local->hw.conf.channel->band; 6077d3be3ccSHelmut Schaa 6087d3be3ccSHelmut Schaa for (i = 0; i < local->scan_req->n_ssids; i++) 6097d3be3ccSHelmut Schaa ieee80211_send_probe_req( 6107d3be3ccSHelmut Schaa sdata, NULL, 6117d3be3ccSHelmut Schaa local->scan_req->ssids[i].ssid, 6127d3be3ccSHelmut Schaa local->scan_req->ssids[i].ssid_len, 613a806c558SPaul Stewart local->scan_req->ie, local->scan_req->ie_len, 614aad14cebSRajkumar Manoharan local->scan_req->rates[band], false, 615aad14cebSRajkumar Manoharan local->scan_req->no_cck); 6167d3be3ccSHelmut Schaa 6177d3be3ccSHelmut Schaa /* 6187d3be3ccSHelmut Schaa * After sending probe requests, wait for probe responses 6197d3be3ccSHelmut Schaa * on the channel. 6207d3be3ccSHelmut Schaa */ 6217d3be3ccSHelmut Schaa *next_delay = IEEE80211_CHANNEL_TIME; 622977923b0SHelmut Schaa local->next_scan_state = SCAN_DECISION; 6237d3be3ccSHelmut Schaa } 6247d3be3ccSHelmut Schaa 62507ef03eeSJohannes Berg static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 62607ef03eeSJohannes Berg unsigned long *next_delay) 62707ef03eeSJohannes Berg { 62807ef03eeSJohannes Berg /* switch back to the operating channel */ 62907ef03eeSJohannes Berg local->scan_channel = NULL; 63007ef03eeSJohannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 63107ef03eeSJohannes Berg 63207ef03eeSJohannes Berg /* 63307ef03eeSJohannes Berg * Re-enable vifs and beaconing. Leave PS 63407ef03eeSJohannes Berg * in off-channel state..will put that back 63507ef03eeSJohannes Berg * on-channel at the end of scanning. 63607ef03eeSJohannes Berg */ 637e76aadc5SJohannes Berg ieee80211_offchannel_return(local, false); 63807ef03eeSJohannes Berg 63907ef03eeSJohannes Berg *next_delay = HZ / 5; 64007ef03eeSJohannes Berg /* afterwards, resume scan & go to next channel */ 64107ef03eeSJohannes Berg local->next_scan_state = SCAN_RESUME; 64207ef03eeSJohannes Berg } 64307ef03eeSJohannes Berg 64407ef03eeSJohannes Berg static void ieee80211_scan_state_resume(struct ieee80211_local *local, 64507ef03eeSJohannes Berg unsigned long *next_delay) 64607ef03eeSJohannes Berg { 64707ef03eeSJohannes Berg /* PS already is in off-channel mode */ 64807ef03eeSJohannes Berg ieee80211_offchannel_stop_vifs(local, false); 64907ef03eeSJohannes Berg 65007ef03eeSJohannes Berg if (local->ops->flush) { 65107ef03eeSJohannes Berg drv_flush(local, false); 65207ef03eeSJohannes Berg *next_delay = 0; 65307ef03eeSJohannes Berg } else 65407ef03eeSJohannes Berg *next_delay = HZ / 10; 65507ef03eeSJohannes Berg 65607ef03eeSJohannes Berg /* remember when we left the operating channel */ 65707ef03eeSJohannes Berg local->leave_oper_channel_time = jiffies; 65807ef03eeSJohannes Berg 65907ef03eeSJohannes Berg /* advance to the next channel to be scanned */ 660de2ee84dSMohammed Shafi Shajakhan local->next_scan_state = SCAN_SET_CHANNEL; 66107ef03eeSJohannes Berg } 66207ef03eeSJohannes Berg 663c2b13452SJohannes Berg void ieee80211_scan_work(struct work_struct *work) 6640a51b27eSJohannes Berg { 6650a51b27eSJohannes Berg struct ieee80211_local *local = 6660a51b27eSJohannes Berg container_of(work, struct ieee80211_local, scan_work.work); 667d07bfd8bSJohannes Berg struct ieee80211_sub_if_data *sdata; 6680a51b27eSJohannes Berg unsigned long next_delay = 0; 669d07bfd8bSJohannes Berg bool aborted, hw_scan; 6708789d459SJohannes Berg 671259b62e3SStanislaw Gruszka mutex_lock(&local->mtx); 672259b62e3SStanislaw Gruszka 673d07bfd8bSJohannes Berg sdata = local->scan_sdata; 674d07bfd8bSJohannes Berg 675259b62e3SStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 6768789d459SJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 677259b62e3SStanislaw Gruszka goto out_complete; 6788789d459SJohannes Berg } 6798789d459SJohannes Berg 680259b62e3SStanislaw Gruszka if (!sdata || !local->scan_req) 681259b62e3SStanislaw Gruszka goto out; 682f3b85252SJohannes Berg 683fbe9c429SHelmut Schaa if (local->scan_req && !local->scanning) { 684f3b85252SJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 685f3b85252SJohannes Berg int rc; 686f3b85252SJohannes Berg 687f3b85252SJohannes Berg local->scan_req = NULL; 68815db0b7fSJohannes Berg local->scan_sdata = NULL; 689f3b85252SJohannes Berg 690f3b85252SJohannes Berg rc = __ieee80211_start_scan(sdata, req); 691259b62e3SStanislaw Gruszka if (rc) { 6923aed49efSStanislaw Gruszka /* need to complete scan in cfg80211 */ 6933aed49efSStanislaw Gruszka local->scan_req = req; 694259b62e3SStanislaw Gruszka aborted = true; 695259b62e3SStanislaw Gruszka goto out_complete; 696259b62e3SStanislaw Gruszka } else 697259b62e3SStanislaw Gruszka goto out; 698f3b85252SJohannes Berg } 699f3b85252SJohannes Berg 7005bc75728SJohannes Berg /* 7015bc75728SJohannes Berg * Avoid re-scheduling when the sdata is going away. 7025bc75728SJohannes Berg */ 7039607e6b6SJohannes Berg if (!ieee80211_sdata_running(sdata)) { 704259b62e3SStanislaw Gruszka aborted = true; 705259b62e3SStanislaw Gruszka goto out_complete; 706f3b85252SJohannes Berg } 7070a51b27eSJohannes Berg 708f502d09bSHelmut Schaa /* 709f502d09bSHelmut Schaa * as long as no delay is required advance immediately 710f502d09bSHelmut Schaa * without scheduling a new work 711f502d09bSHelmut Schaa */ 712f502d09bSHelmut Schaa do { 713c29acf20SRajkumar Manoharan if (!ieee80211_sdata_running(sdata)) { 714c29acf20SRajkumar Manoharan aborted = true; 715c29acf20SRajkumar Manoharan goto out_complete; 716c29acf20SRajkumar Manoharan } 717c29acf20SRajkumar Manoharan 718977923b0SHelmut Schaa switch (local->next_scan_state) { 7192fb3f028SHelmut Schaa case SCAN_DECISION: 720e229f844SStanislaw Gruszka /* if no more bands/channels left, complete scan */ 721e229f844SStanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 722e229f844SStanislaw Gruszka aborted = false; 723e229f844SStanislaw Gruszka goto out_complete; 724e229f844SStanislaw Gruszka } 725e229f844SStanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 7260a51b27eSJohannes Berg break; 7272fb3f028SHelmut Schaa case SCAN_SET_CHANNEL: 7282fb3f028SHelmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7292fb3f028SHelmut Schaa break; 7300a51b27eSJohannes Berg case SCAN_SEND_PROBE: 7317d3be3ccSHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 7320a51b27eSJohannes Berg break; 73307ef03eeSJohannes Berg case SCAN_SUSPEND: 73407ef03eeSJohannes Berg ieee80211_scan_state_suspend(local, &next_delay); 735142b9f50SHelmut Schaa break; 73607ef03eeSJohannes Berg case SCAN_RESUME: 73707ef03eeSJohannes Berg ieee80211_scan_state_resume(local, &next_delay); 738142b9f50SHelmut Schaa break; 7390a51b27eSJohannes Berg } 740f502d09bSHelmut Schaa } while (next_delay == 0); 7410a51b27eSJohannes Berg 74242935ecaSLuis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 743d07bfd8bSJohannes Berg goto out; 744259b62e3SStanislaw Gruszka 745259b62e3SStanislaw Gruszka out_complete: 746e229f844SStanislaw Gruszka hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 747d07bfd8bSJohannes Berg __ieee80211_scan_completed(&local->hw, aborted, hw_scan); 748259b62e3SStanislaw Gruszka out: 749259b62e3SStanislaw Gruszka mutex_unlock(&local->mtx); 7500a51b27eSJohannes Berg } 7510a51b27eSJohannes Berg 752c2b13452SJohannes Berg int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 7532a519311SJohannes Berg struct cfg80211_scan_request *req) 7540a51b27eSJohannes Berg { 755f3b85252SJohannes Berg int res; 7560a51b27eSJohannes Berg 757a1699b75SJohannes Berg mutex_lock(&sdata->local->mtx); 758f3b85252SJohannes Berg res = __ieee80211_start_scan(sdata, req); 759a1699b75SJohannes Berg mutex_unlock(&sdata->local->mtx); 7602a519311SJohannes Berg 761f3b85252SJohannes Berg return res; 7620a51b27eSJohannes Berg } 7630a51b27eSJohannes Berg 764f3b85252SJohannes Berg int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 765be4a4b6aSJohannes Berg const u8 *ssid, u8 ssid_len, 766be4a4b6aSJohannes Berg struct ieee80211_channel *chan) 767f3b85252SJohannes Berg { 768f3b85252SJohannes Berg struct ieee80211_local *local = sdata->local; 769f3b85252SJohannes Berg int ret = -EBUSY; 770fb63bc41SGertjan van Wingerde enum ieee80211_band band; 7719116dd01SJohannes Berg 772a1699b75SJohannes Berg mutex_lock(&local->mtx); 773f3b85252SJohannes Berg 774f3b85252SJohannes Berg /* busy scanning */ 775f3b85252SJohannes Berg if (local->scan_req) 776f3b85252SJohannes Berg goto unlock; 777f3b85252SJohannes Berg 778be4a4b6aSJohannes Berg /* fill internal scan request */ 779be4a4b6aSJohannes Berg if (!chan) { 780be4a4b6aSJohannes Berg int i, nchan = 0; 781be4a4b6aSJohannes Berg 782be4a4b6aSJohannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 783be4a4b6aSJohannes Berg if (!local->hw.wiphy->bands[band]) 784be4a4b6aSJohannes Berg continue; 785be4a4b6aSJohannes Berg for (i = 0; 786be4a4b6aSJohannes Berg i < local->hw.wiphy->bands[band]->n_channels; 787be4a4b6aSJohannes Berg i++) { 788be4a4b6aSJohannes Berg local->int_scan_req->channels[nchan] = 789be4a4b6aSJohannes Berg &local->hw.wiphy->bands[band]->channels[i]; 790be4a4b6aSJohannes Berg nchan++; 791be4a4b6aSJohannes Berg } 792be4a4b6aSJohannes Berg } 793be4a4b6aSJohannes Berg 794be4a4b6aSJohannes Berg local->int_scan_req->n_channels = nchan; 795be4a4b6aSJohannes Berg } else { 796be4a4b6aSJohannes Berg local->int_scan_req->channels[0] = chan; 797be4a4b6aSJohannes Berg local->int_scan_req->n_channels = 1; 798be4a4b6aSJohannes Berg } 799be4a4b6aSJohannes Berg 800be4a4b6aSJohannes Berg local->int_scan_req->ssids = &local->scan_ssid; 801be4a4b6aSJohannes Berg local->int_scan_req->n_ssids = 1; 8025ba63533SJohannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 8035ba63533SJohannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 804f3b85252SJohannes Berg 8055ba63533SJohannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 806f3b85252SJohannes Berg unlock: 807a1699b75SJohannes Berg mutex_unlock(&local->mtx); 808f3b85252SJohannes Berg return ret; 8090a51b27eSJohannes Berg } 8105bb644a0SJohannes Berg 8114136c422SStanislaw Gruszka /* 8124136c422SStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 8134136c422SStanislaw Gruszka */ 8145bb644a0SJohannes Berg void ieee80211_scan_cancel(struct ieee80211_local *local) 8155bb644a0SJohannes Berg { 8165bb644a0SJohannes Berg /* 817b856439bSEliad Peller * We are canceling software scan, or deferred scan that was not 8184136c422SStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 8194136c422SStanislaw Gruszka * 8204136c422SStanislaw Gruszka * Regarding hardware scan: 8214136c422SStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 8224136c422SStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 8234136c422SStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 8244136c422SStanislaw Gruszka * driver which can use local->hw_scan_req 8254136c422SStanislaw Gruszka * 8264136c422SStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 8274136c422SStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 8284136c422SStanislaw Gruszka * 829b856439bSEliad Peller * Hence we only call the cancel_hw_scan() callback, but the low-level 830b856439bSEliad Peller * driver is still responsible for calling ieee80211_scan_completed() 831b856439bSEliad Peller * after the scan was completed/aborted. 8325bb644a0SJohannes Berg */ 8334136c422SStanislaw Gruszka 834a1699b75SJohannes Berg mutex_lock(&local->mtx); 835b856439bSEliad Peller if (!local->scan_req) 836b856439bSEliad Peller goto out; 837b856439bSEliad Peller 838b856439bSEliad Peller if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 839b856439bSEliad Peller if (local->ops->cancel_hw_scan) 840b856439bSEliad Peller drv_cancel_hw_scan(local, local->scan_sdata); 841b856439bSEliad Peller goto out; 842b856439bSEliad Peller } 843b856439bSEliad Peller 844d07bfd8bSJohannes Berg /* 845d07bfd8bSJohannes Berg * If the work is currently running, it must be blocked on 846d07bfd8bSJohannes Berg * the mutex, but we'll set scan_sdata = NULL and it'll 847d07bfd8bSJohannes Berg * simply exit once it acquires the mutex. 848d07bfd8bSJohannes Berg */ 849d07bfd8bSJohannes Berg cancel_delayed_work(&local->scan_work); 850d07bfd8bSJohannes Berg /* and clean up */ 851d07bfd8bSJohannes Berg __ieee80211_scan_completed(&local->hw, true, false); 852b856439bSEliad Peller out: 853d07bfd8bSJohannes Berg mutex_unlock(&local->mtx); 8545bb644a0SJohannes Berg } 85579f460caSLuciano Coelho 85679f460caSLuciano Coelho int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 85779f460caSLuciano Coelho struct cfg80211_sched_scan_request *req) 85879f460caSLuciano Coelho { 85979f460caSLuciano Coelho struct ieee80211_local *local = sdata->local; 86079f460caSLuciano Coelho int ret, i; 86179f460caSLuciano Coelho 86279f460caSLuciano Coelho mutex_lock(&sdata->local->mtx); 86379f460caSLuciano Coelho 86479f460caSLuciano Coelho if (local->sched_scanning) { 86579f460caSLuciano Coelho ret = -EBUSY; 86679f460caSLuciano Coelho goto out; 86779f460caSLuciano Coelho } 86879f460caSLuciano Coelho 86979f460caSLuciano Coelho if (!local->ops->sched_scan_start) { 87079f460caSLuciano Coelho ret = -ENOTSUPP; 87179f460caSLuciano Coelho goto out; 87279f460caSLuciano Coelho } 87379f460caSLuciano Coelho 87479f460caSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 87579f460caSLuciano Coelho local->sched_scan_ies.ie[i] = kzalloc(2 + 87679f460caSLuciano Coelho IEEE80211_MAX_SSID_LEN + 8771186980dSLuciano Coelho local->scan_ies_len + 8781186980dSLuciano Coelho req->ie_len, 87979f460caSLuciano Coelho GFP_KERNEL); 88079f460caSLuciano Coelho if (!local->sched_scan_ies.ie[i]) { 88179f460caSLuciano Coelho ret = -ENOMEM; 88279f460caSLuciano Coelho goto out_free; 88379f460caSLuciano Coelho } 88479f460caSLuciano Coelho 88579f460caSLuciano Coelho local->sched_scan_ies.len[i] = 88679f460caSLuciano Coelho ieee80211_build_preq_ies(local, 88779f460caSLuciano Coelho local->sched_scan_ies.ie[i], 88879f460caSLuciano Coelho req->ie, req->ie_len, i, 88979f460caSLuciano Coelho (u32) -1, 0); 89079f460caSLuciano Coelho } 89179f460caSLuciano Coelho 89279f460caSLuciano Coelho ret = drv_sched_scan_start(local, sdata, req, 89379f460caSLuciano Coelho &local->sched_scan_ies); 89479f460caSLuciano Coelho if (ret == 0) { 89579f460caSLuciano Coelho local->sched_scanning = true; 89679f460caSLuciano Coelho goto out; 89779f460caSLuciano Coelho } 89879f460caSLuciano Coelho 89979f460caSLuciano Coelho out_free: 90079f460caSLuciano Coelho while (i > 0) 90179f460caSLuciano Coelho kfree(local->sched_scan_ies.ie[--i]); 90279f460caSLuciano Coelho out: 90379f460caSLuciano Coelho mutex_unlock(&sdata->local->mtx); 90479f460caSLuciano Coelho return ret; 90579f460caSLuciano Coelho } 90679f460caSLuciano Coelho 90785a9994aSLuciano Coelho int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) 90879f460caSLuciano Coelho { 90979f460caSLuciano Coelho struct ieee80211_local *local = sdata->local; 91079f460caSLuciano Coelho int ret = 0, i; 91179f460caSLuciano Coelho 91279f460caSLuciano Coelho mutex_lock(&sdata->local->mtx); 91379f460caSLuciano Coelho 91479f460caSLuciano Coelho if (!local->ops->sched_scan_stop) { 91579f460caSLuciano Coelho ret = -ENOTSUPP; 91679f460caSLuciano Coelho goto out; 91779f460caSLuciano Coelho } 91879f460caSLuciano Coelho 91979f460caSLuciano Coelho if (local->sched_scanning) { 92079f460caSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) 92179f460caSLuciano Coelho kfree(local->sched_scan_ies.ie[i]); 92279f460caSLuciano Coelho 92379f460caSLuciano Coelho drv_sched_scan_stop(local, sdata); 92479f460caSLuciano Coelho local->sched_scanning = false; 92579f460caSLuciano Coelho } 92679f460caSLuciano Coelho out: 92779f460caSLuciano Coelho mutex_unlock(&sdata->local->mtx); 92879f460caSLuciano Coelho 92979f460caSLuciano Coelho return ret; 93079f460caSLuciano Coelho } 93179f460caSLuciano Coelho 93279f460caSLuciano Coelho void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 93379f460caSLuciano Coelho { 93479f460caSLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 93579f460caSLuciano Coelho 93679f460caSLuciano Coelho trace_api_sched_scan_results(local); 93779f460caSLuciano Coelho 93879f460caSLuciano Coelho cfg80211_sched_scan_results(hw->wiphy); 93979f460caSLuciano Coelho } 94079f460caSLuciano Coelho EXPORT_SYMBOL(ieee80211_sched_scan_results); 94179f460caSLuciano Coelho 94285a9994aSLuciano Coelho void ieee80211_sched_scan_stopped_work(struct work_struct *work) 94385a9994aSLuciano Coelho { 94485a9994aSLuciano Coelho struct ieee80211_local *local = 94585a9994aSLuciano Coelho container_of(work, struct ieee80211_local, 94685a9994aSLuciano Coelho sched_scan_stopped_work); 94785a9994aSLuciano Coelho int i; 94885a9994aSLuciano Coelho 94985a9994aSLuciano Coelho mutex_lock(&local->mtx); 95085a9994aSLuciano Coelho 95185a9994aSLuciano Coelho if (!local->sched_scanning) { 95285a9994aSLuciano Coelho mutex_unlock(&local->mtx); 95385a9994aSLuciano Coelho return; 95485a9994aSLuciano Coelho } 95585a9994aSLuciano Coelho 95685a9994aSLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) 95785a9994aSLuciano Coelho kfree(local->sched_scan_ies.ie[i]); 95885a9994aSLuciano Coelho 95985a9994aSLuciano Coelho local->sched_scanning = false; 96085a9994aSLuciano Coelho 96185a9994aSLuciano Coelho mutex_unlock(&local->mtx); 96285a9994aSLuciano Coelho 96385a9994aSLuciano Coelho cfg80211_sched_scan_stopped(local->hw.wiphy); 96485a9994aSLuciano Coelho } 96585a9994aSLuciano Coelho 96679f460caSLuciano Coelho void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 96779f460caSLuciano Coelho { 96879f460caSLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 96979f460caSLuciano Coelho 97079f460caSLuciano Coelho trace_api_sched_scan_stopped(local); 97179f460caSLuciano Coelho 97285a9994aSLuciano Coelho ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); 97379f460caSLuciano Coelho } 97479f460caSLuciano Coelho EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 975