scan.c revision c56ef6725068c0ce499e517409c0da226ef51b08
10a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg/* 25484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg * Scanning implementation 35484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg * 40a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 50a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2004, Instant802 Networks, Inc. 60a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2005, Devicescape Software, Inc. 70a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 80a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 90a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * 100a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * This program is free software; you can redistribute it and/or modify 110a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * it under the terms of the GNU General Public License version 2 as 120a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * published by the Free Software Foundation. 130a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg */ 140a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 150a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include <linux/if_arp.h> 16888d04dfbe7e09f930fdaafb257cce2c54c9c3f3Felix Fietkau#include <linux/etherdevice.h> 17078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg#include <linux/rtnetlink.h> 18e8db0be1245de16a6cc6365506abc392c3c212d4Jean Pihet#include <linux/pm_qos.h> 19df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa#include <net/sch_generic.h> 205a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 21bc3b2d7fb9b014d75ebb79ba371a763dbab5e8cfPaul Gortmaker#include <linux/export.h> 220a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include <net/mac80211.h> 230a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 240a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include "ieee80211_i.h" 252448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg#include "driver-ops.h" 265484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg#include "mesh.h" 270a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 280a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#define IEEE80211_PROBE_DELAY (HZ / 33) 290a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#define IEEE80211_CHANNEL_TIME (HZ / 33) 303f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) 310a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 325484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergvoid ieee80211_rx_bss_put(struct ieee80211_local *local, 33c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss) 345484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 350c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!bss) 360c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg return; 375b112d3d098c97b867cc580f590395cd1e72f18cJohannes Berg cfg80211_put_bss(local->hw.wiphy, 385b112d3d098c97b867cc580f590395cd1e72f18cJohannes Berg container_of((void *)bss, struct cfg80211_bss, priv)); 395484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 405484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 41ab13315af97919fae0e014748105fdc2e30afb2dKalle Valostatic bool is_uapsd_supported(struct ieee802_11_elems *elems) 42ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo{ 43ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo u8 qos_info; 44ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 45ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo if (elems->wmm_info && elems->wmm_info_len == 7 46ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo && elems->wmm_info[5] == 1) 47ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo qos_info = elems->wmm_info[6]; 48ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo else if (elems->wmm_param && elems->wmm_param_len == 24 49ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo && elems->wmm_param[5] == 1) 50ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo qos_info = elems->wmm_param[6]; 51ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo else 52ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo /* no valid wmm information or parameter element found */ 53ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo return false; 54ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 55ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 56ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo} 57ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 58c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergstruct ieee80211_bss * 595484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergieee80211_bss_info_update(struct ieee80211_local *local, 605484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_rx_status *rx_status, 61d45c41722a3eca639ced2c4c93665ced229b1da9Emmanuel Grumbach struct ieee80211_mgmt *mgmt, size_t len, 625484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee802_11_elems *elems, 63d45c41722a3eca639ced2c4c93665ced229b1da9Emmanuel Grumbach struct ieee80211_channel *channel) 645484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 65d45c41722a3eca639ced2c4c93665ced229b1da9Emmanuel Grumbach bool beacon = ieee80211_is_beacon(mgmt->frame_control); 660c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg struct cfg80211_bss *cbss; 67c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 68f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka int clen, srlen; 697ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich enum nl80211_bss_scan_width scan_width; 702a5193119269062608582418deba7af82844159aJohannes Berg s32 signal = 0; 712a5193119269062608582418deba7af82844159aJohannes Berg 7277965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 732a5193119269062608582418deba7af82844159aJohannes Berg signal = rx_status->signal * 100; 7477965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 752a5193119269062608582418deba7af82844159aJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 762a5193119269062608582418deba7af82844159aJohannes Berg 777ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich scan_width = NL80211_BSS_CHAN_WIDTH_20; 787ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich if (rx_status->flag & RX_FLAG_5MHZ) 797ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich scan_width = NL80211_BSS_CHAN_WIDTH_5; 807ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich if (rx_status->flag & RX_FLAG_10MHZ) 817ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich scan_width = NL80211_BSS_CHAN_WIDTH_10; 827ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich 837ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel, 847ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich scan_width, mgmt, len, signal, 857ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich GFP_ATOMIC); 860c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!cbss) 8700d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg return NULL; 8800d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg 890c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg bss = (void *)cbss->priv; 905484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 91ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg if (beacon) 92ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg bss->device_ts_beacon = rx_status->device_timestamp; 93ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg else 94ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg bss->device_ts_presp = rx_status->device_timestamp; 958c358bcd097fa1f63e57fb82525ba52f4a537bfaJohannes Berg 96fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->parse_error) { 97fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (beacon) 98fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 99fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart else 100fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 101fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } else { 102fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (beacon) 103fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 104fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart else 105fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 106fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 107fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart 1085484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg /* save the ERP value so that it is available at association time */ 1091946bed95707ef75d85e94ebe106ce7a119ca831Johannes Berg if (elems->erp_info && (!elems->parse_error || 1101946bed95707ef75d85e94ebe106ce7a119ca831Johannes Berg !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 1115484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->erp_value = elems->erp_info[0]; 1123db1cd5c05f35fb43eb134df6f321de4e63141f2Rusty Russell bss->has_erp_value = true; 113fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 114fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_ERP; 1155484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1165484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 117f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka /* replace old supported rates if we get new values */ 118fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error || 119fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 120fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen = 0; 121fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->supp_rates) { 122fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = IEEE80211_MAX_SUPP_RATES; 123fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (clen > elems->supp_rates_len) 124fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = elems->supp_rates_len; 125fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart memcpy(bss->supp_rates, elems->supp_rates, clen); 126fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen += clen; 127fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 128fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->ext_supp_rates) { 129fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = IEEE80211_MAX_SUPP_RATES - srlen; 130fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (clen > elems->ext_supp_rates_len) 131fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = elems->ext_supp_rates_len; 132fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 133fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen); 134fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen += clen; 135fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 136fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (srlen) { 137fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->supp_rates_len = srlen; 138fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 139fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_RATES; 140fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 1415484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1425484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 143fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error || 144fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 145fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->wmm_used = elems->wmm_param || elems->wmm_info; 146fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->uapsd_supported = is_uapsd_supported(elems); 147fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 148fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_WMM; 149fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 1505484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 151817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar if (beacon) { 152817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar struct ieee80211_supported_band *sband = 153817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar local->hw.wiphy->bands[rx_status->band]; 154817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar if (!(rx_status->flag & RX_FLAG_HT) && 155817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar !(rx_status->flag & RX_FLAG_VHT)) 156817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar bss->beacon_rate = 157817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar &sband->bitrates[rx_status->rate_idx]; 158817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar } 159817cee767523769cbc5ac94e439cde0c21752cbcAlexander Bondar 1605484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg return bss; 1615484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 1620a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 163d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Bergvoid ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 16498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg{ 165f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 166d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg struct ieee80211_sub_if_data *sdata1, *sdata2; 167d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg struct ieee80211_mgmt *mgmt = (void *)skb->data; 168c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 16998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg u8 *elements; 17098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_channel *channel; 17198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg size_t baselen; 17298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee802_11_elems elems; 17398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 174d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if (skb->len < 24 || 175d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg (!ieee80211_is_probe_resp(mgmt->frame_control) && 176d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg !ieee80211_is_beacon(mgmt->frame_control))) 177d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 17898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 179d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg sdata1 = rcu_dereference(local->scan_sdata); 180d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg sdata2 = rcu_dereference(local->sched_scan_sdata); 18198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 182d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if (likely(!sdata1 && !sdata2)) 183d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 18498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 185d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if (ieee80211_is_probe_resp(mgmt->frame_control)) { 18698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg /* ignore ProbeResp to foreign address */ 187d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && 188d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) 189d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 19098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.probe_resp.variable; 19298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 19398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } else { 19498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 19598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.beacon.variable; 19698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } 19798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (baselen > skb->len) 199d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 20098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 201b2e506bfc4d752b68a0ccaae1e977898263eba4cJohannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); 20298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 2030172bb75073e11a5aa9d8a953bdaefb8709f00c8Johannes Berg channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 20498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 206d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 20798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 208d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg bss = ieee80211_bss_info_update(local, rx_status, 20998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt, skb->len, &elems, 210d45c41722a3eca639ced2c4c93665ced229b1da9Emmanuel Grumbach channel); 211d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen if (bss) 212d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg ieee80211_rx_bss_put(local, bss); 21398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg} 21498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 2152103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlichstatic void 2162103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlichieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, 2172103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich enum nl80211_bss_scan_width scan_width) 2182103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich{ 2192103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich memset(chandef, 0, sizeof(*chandef)); 2202103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich switch (scan_width) { 2212103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich case NL80211_BSS_CHAN_WIDTH_5: 2222103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich chandef->width = NL80211_CHAN_WIDTH_5; 2232103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich break; 2242103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich case NL80211_BSS_CHAN_WIDTH_10: 2252103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich chandef->width = NL80211_CHAN_WIDTH_10; 2262103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich break; 2272103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich default: 2282103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 2292103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich break; 2302103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich } 2312103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich} 2322103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich 2334d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg/* return false if no more work */ 2344d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Bergstatic bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2354d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg{ 2364d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2372103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich struct cfg80211_chan_def chandef; 238c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel u8 bands_used = 0; 2394d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int i, ielen, n_chans; 2404d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 241a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 242a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach return false; 243a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach 244c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { 2454d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg for (i = 0; i < req->n_channels; i++) { 246c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.channels[i] = req->channels[i]; 247c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel bands_used |= BIT(req->channels[i]->band); 248c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel } 249c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 250c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel n_chans = req->n_channels; 251c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel } else { 252c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel do { 253c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel if (local->hw_scan_band == IEEE80211_NUM_BANDS) 254c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel return false; 255c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 256c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel n_chans = 0; 257c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 258c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel for (i = 0; i < req->n_channels; i++) { 259c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel if (req->channels[i]->band != 260c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_band) 261c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel continue; 262c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.channels[n_chans] = 2634d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->channels[i]; 2644d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans++; 265c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel bands_used |= BIT(req->channels[i]->band); 2664d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2674d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 268c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_band++; 269c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel } while (!n_chans); 270c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel } 2714d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 272c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.n_channels = n_chans; 2732103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 2744d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 275c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel ielen = ieee80211_build_preq_ies(local, 276c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel (u8 *)local->hw_scan_req->req.ie, 277c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->hw_scan_ies_bufsize, 278c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel &local->hw_scan_req->ies, 279c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel req->ie, req->ie_len, 280c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel bands_used, req->rates, &chandef); 281c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.ie_len = ielen; 282c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.no_cck = req->no_cck; 2834d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2844d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return true; 2854d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg} 2864d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2878bd2a2489971d3bcdbae6d9d9e9414f04cb0543bEliad Pellerstatic void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 2880a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2890a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 2908bd2a2489971d3bcdbae6d9d9e9414f04cb0543bEliad Peller bool hw_scan = local->ops->hw_scan; 291a2b70e833e189a4aefb2d3b668e3d7046dcc45c2Eliad Peller bool was_scanning = local->scanning; 2920a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 293e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 2945bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 2956d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 2966d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 2976d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 2986d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 2996d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 3006d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 3016d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 3026d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 3035bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 304e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (WARN_ON(!local->scan_req)) 305d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg return; 306de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 307c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel if (hw_scan && !aborted && 308c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel !(local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) && 309c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel ieee80211_prep_hw_scan(local)) { 310e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg int rc; 311e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 312e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rc = drv_hw_scan(local, 313e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected(local->scan_sdata, 314e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)), 315e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg local->hw_scan_req); 316e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 3176eb11a9a311a0f7e5b9b66c18f7498a26c9ec206Stanislaw Gruszka if (rc == 0) 318d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg return; 3194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 3204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 3214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 3224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 323f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3245ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 3252a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 3262a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 3270c2bef4621c5feb5bda9068c9964b2e9acf57017Monam Agarwal RCU_INIT_POINTER(local->scan_sdata, NULL); 3282a5193119269062608582418deba7af82844159aJohannes Berg 329fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 3307ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.chan = NULL; 331f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 33207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* Set power back to normal operating levels. */ 33307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_hw_config(local, 0); 334a0daa0e7592ada797d6835f11529097aabc27ad2Luis R. Rodriguez 3358bd2a2489971d3bcdbae6d9d9e9414f04cb0543bEliad Peller if (!hw_scan) { 336e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_configure_filter(local); 337e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka drv_sw_scan_complete(local); 338aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_return(local); 339e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 3400a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3415cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 342e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 3430a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 344469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 345472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 346a2b70e833e189a4aefb2d3b668e3d7046dcc45c2Eliad Peller if (was_scanning) 347a2b70e833e189a4aefb2d3b668e3d7046dcc45c2Eliad Peller ieee80211_start_next_roc(local); 3480a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 3498789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3508789d459bc5e837bf37d261453df96ef54018d7bJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 3518789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg{ 3528789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3538789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3548789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg trace_api_scan_completed(local, aborted); 3558789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3568789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3578789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg if (aborted) 3588789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3598789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3608789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg} 3610a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3620a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 363f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 364f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 365fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg /* Software scan is not supported in multi-channel cases */ 366fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg if (local->use_chanctx) 367fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg return -EOPNOTSUPP; 368fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg 369f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 370f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 371f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 372f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 373f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 374f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 375f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 376f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 377f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 378f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 379f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 380f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 381f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3822448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 383f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 384de312db345f9770b64ff39ef5a7f86f6358e93ccRajkumar Manoharan local->leave_oper_channel_time = jiffies; 385977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 386f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 387f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 388aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_stop_vifs(local); 389a80f7c0b088187c8471b441d461e937991870661Johannes Berg 3909c35d7d2368f54313b988a01c408e5cf863ffd9eSeth Forshee /* ensure nullfunc is transmitted before leaving operating channel */ 39139ecc01d1bbe3de2cf5f01a81e176ea5160d3b95Johannes Berg ieee80211_flush_queues(local, NULL); 3929c35d7d2368f54313b988a01c408e5cf863ffd9eSeth Forshee 3933ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 394f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 39559bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear /* We need to set power level at maximum rate for scanning. */ 39659bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear ieee80211_hw_config(local, 0); 39759bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear 39842935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 39907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg &local->scan_work, 0); 400f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 401f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 402f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 403f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 404133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszkastatic bool ieee80211_can_scan(struct ieee80211_local *local, 405133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka struct ieee80211_sub_if_data *sdata) 406133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka{ 407164eb02d070af987890e1db1c12b8ae0394b19f7Simon Wunderlich if (local->radar_detect_enabled) 408164eb02d070af987890e1db1c12b8ae0394b19f7Simon Wunderlich return false; 409164eb02d070af987890e1db1c12b8ae0394b19f7Simon Wunderlich 4102eb278e083549f4eb29838037004054b3b55df62Johannes Berg if (!list_empty(&local->roc_list)) 411133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return false; 412133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 413133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (sdata->vif.type == NL80211_IFTYPE_STATION && 414392b9ffb05b62fe38aa813b924d160ab663cec8dStanislaw Gruszka sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 415133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return false; 416133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 417133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return true; 418133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka} 419133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 420133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszkavoid ieee80211_run_deferred_scan(struct ieee80211_local *local) 421133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka{ 422133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka lockdep_assert_held(&local->mtx); 423133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 424133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (!local->scan_req || local->scanning) 425133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return; 426133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 427e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg if (!ieee80211_can_scan(local, 428e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected( 429e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg local->scan_sdata, 430e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)))) 431133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return; 432133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 433133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 434133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka round_jiffies_relative(0)); 435133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka} 436f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4378a690674e0601efbe9a7b16a5826fc522645cca3Ben Greearstatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 4388a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear unsigned long *next_delay) 4398a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear{ 4408a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear int i; 441e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg struct ieee80211_sub_if_data *sdata; 442675a0b049abf6edf30f8dd84c5610b6edc2296c8Karl Beldan enum ieee80211_band band = local->hw.conf.chandef.chan->band; 4436c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee u32 tx_flags; 4446c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee 4456c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 4466c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee if (local->scan_req->no_cck) 4476c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 4488a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 449e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 450316b6b5df77db801d62ec381cfae0c38ff84252cPeter Senna Tschudin lockdep_is_held(&local->mtx)); 451e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 4528a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear for (i = 0; i < local->scan_req->n_ssids; i++) 4538a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_send_probe_req( 4548a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear sdata, NULL, 4558a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ssids[i].ssid, 4568a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ssids[i].ssid_len, 4578a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ie, local->scan_req->ie_len, 4588a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->rates[band], false, 459675a0b049abf6edf30f8dd84c5610b6edc2296c8Karl Beldan tx_flags, local->hw.conf.chandef.chan, true); 4608a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4618a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* 4628a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * After sending probe requests, wait for probe responses 4638a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * on the channel. 4648a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear */ 4658a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear *next_delay = IEEE80211_CHANNEL_TIME; 4668a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->next_scan_state = SCAN_DECISION; 4678a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear} 4688a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 469f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 470f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 471f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 472f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 473f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 474f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 475e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 476e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 477f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 478f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 479f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 480133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (!ieee80211_can_scan(local, sdata)) { 4816e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* wait for the work to finish/time out */ 482c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_req = req; 483e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 484c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg return 0; 485c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg } 486c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg 487f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 488f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 489f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 490e4dcbb375cd829e1649b12e0ab7d7e5b7efcb5a5David Spinadel local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 491c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 492c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { 493c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel int i, n_bands = 0; 494c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel u8 bands_counted = 0; 495c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 496c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel for (i = 0; i < req->n_channels; i++) { 497c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel if (bands_counted & BIT(req->channels[i]->band)) 498c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel continue; 499c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel bands_counted |= BIT(req->channels[i]->band); 500c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel n_bands++; 501c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel } 502c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 503c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_ies_bufsize *= n_bands; 504c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel } 505c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 5064d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 5074d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 5084d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 509c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->hw_scan_ies_bufsize, GFP_KERNEL); 5104d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 511f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 512f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 513c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.ssids = req->ssids; 514c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.n_ssids = req->n_ssids; 5154d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 5164d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 5174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 518c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.ie = ies; 519c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel local->hw_scan_req->req.flags = req->flags; 5204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 5214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 5226e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 5236e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* 5246e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * After allocating local->hw_scan_req, we must 5256e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * go through until ieee80211_prep_hw_scan(), so 5266e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * anything that might be changed here and leave 5276e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * this function early must not go after this 5286e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * allocation. 5296e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville */ 530f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 531f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 532f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 533e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 534f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5358a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if (local->ops->hw_scan) { 536fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 5378a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else if ((req->n_channels == 1) && 538675a0b049abf6edf30f8dd84c5610b6edc2296c8Karl Beldan (req->channels[0] == local->_oper_chandef.chan)) { 5399b8648704358e42f9865cd6de7cedb5ac0db67e7Johannes Berg /* 5409b8648704358e42f9865cd6de7cedb5ac0db67e7Johannes Berg * If we are scanning only on the operating channel 5419b8648704358e42f9865cd6de7cedb5ac0db67e7Johannes Berg * then we do not need to stop normal activities 5428a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear */ 5438a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear unsigned long next_delay; 5448a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5458a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 5468a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5478a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_recalc_idle(local); 5488a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5498a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Notify driver scan is starting, keep order of operations 5508a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * same as normal software scan, in case that matters. */ 5518a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear drv_sw_scan_start(local); 5528a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5538a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_configure_filter(local); /* accept probe-responses */ 5548a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5558a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* We need to ensure power level is at max for scanning. */ 5568a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_hw_config(local, 0); 5578a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5588a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if ((req->channels[0]->flags & 5598fe02e167efa8ed4a4503a5eedc0f49fcb7e3eb9Luis R. Rodriguez IEEE80211_CHAN_NO_IR) || 5608a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear !local->scan_req->n_ssids) { 5618a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 5628a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else { 5638a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_scan_state_send_probe(local, &next_delay); 5648a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay = IEEE80211_CHANNEL_TIME; 5658a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 5668a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5678a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Now, just wait a bit and we are all done! */ 5688a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 5698a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay); 5708a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear return 0; 5718a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else { 5728a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Do normal software scan */ 573fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 5748a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 5756e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 5765cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 577f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5784d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 5794d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 580a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 5814d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 582f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 583f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 584f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 5854d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 5864d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 587fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 588f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5895cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 5905cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 591f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 5920c2bef4621c5feb5bda9068c9964b2e9acf57017Monam Agarwal RCU_INIT_POINTER(local->scan_sdata, NULL); 593f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 594f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 595f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 596f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 597f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 598df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaastatic unsigned long 599df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaaieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 600df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa{ 601df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 602df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * TODO: channel switching also consumes quite some time, 603df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * add that delay as well to get a better estimation 604df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 6058fe02e167efa8ed4a4503a5eedc0f49fcb7e3eb9Luis R. Rodriguez if (chan->flags & IEEE80211_CHAN_NO_IR) 606df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 607df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 608df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa} 609df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 610e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszkastatic void ieee80211_scan_state_decision(struct ieee80211_local *local, 611e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka unsigned long *next_delay) 6127d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 613142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 614df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool tx_empty = true; 615df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool bad_latency; 616142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 617df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa struct ieee80211_channel *next_chan; 618cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler enum mac80211_scan_state next_scan_state; 619142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 620df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 621df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface is associated, 622df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface has pending tx frames 623df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * and grab the lowest used beacon interval 624df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 625142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 626142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 6279607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 628142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 629142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 630142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 631142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 632142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 633df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 634df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 635df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa tx_empty = false; 636df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa break; 637df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa } 638142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 639142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 640142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 641142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 642142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 643b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear next_chan = local->scan_req->channels[local->scan_channel_idx]; 644b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 645a80f7c0b088187c8471b441d461e937991870661Johannes Berg /* 64607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * we're currently scanning a different channel, let's 64707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * see if we can scan another channel without interfering 64807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * with the current traffic situation. 64907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * 6503f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka * Keep good latency, do not stay off-channel more than 125 ms. 651a80f7c0b088187c8471b441d461e937991870661Johannes Berg */ 652a80f7c0b088187c8471b441d461e937991870661Johannes Berg 65307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg bad_latency = time_after(jiffies + 6543f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka ieee80211_scan_get_channel_time(next_chan), 6553f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka local->leave_oper_channel_time + HZ / 8); 656142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 657cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler if (associated && !tx_empty) { 658cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 659cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_ABORT; 660cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler else 661cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_SUSPEND; 6623f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka } else if (associated && bad_latency) { 663cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_SUSPEND; 664cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler } else { 665cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_SET_CHANNEL; 666cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler } 667cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler 668cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler local->next_scan_state = next_scan_state; 669142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 67007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = 0; 671142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 672142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 6732fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 6742fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 6752fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 6762fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 6772fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 6787ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich enum nl80211_bss_scan_width oper_scan_width; 6792fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 6807d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 6817d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 6827d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6837ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.chan = chan; 6847ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.center_freq1 = chan->center_freq; 6857ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.center_freq2 = 0; 6867ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich switch (local->scan_req->scan_width) { 6877ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich case NL80211_BSS_CHAN_WIDTH_5: 6887ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.width = NL80211_CHAN_WIDTH_5; 6897ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich break; 6907ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich case NL80211_BSS_CHAN_WIDTH_10: 6917ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.width = NL80211_CHAN_WIDTH_10; 6927ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich break; 6937ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich case NL80211_BSS_CHAN_WIDTH_20: 6947ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich /* If scanning on oper channel, use whatever channel-type 6957ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich * is currently in use. 6967ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich */ 6977ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich oper_scan_width = cfg80211_chandef_to_scan_width( 6987ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich &local->_oper_chandef); 6997ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich if (chan == local->_oper_chandef.chan && 7007ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich oper_scan_width == local->scan_req->scan_width) 7017ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef = local->_oper_chandef; 7027ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich else 7037ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 7047ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich break; 7057ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich } 706b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 70707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 70807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg skip = 1; 7097d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 7107d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 7117d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 7127d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 7130ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 7140ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 7150ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 7162fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 7170ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 7187d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 7197d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 7207d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 7217d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 7227d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 7237d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 7247d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 7257d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 7267d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 7277d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 7287d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 7298fe02e167efa8ed4a4503a5eedc0f49fcb7e3eb9Luis R. Rodriguez if (chan->flags & IEEE80211_CHAN_NO_IR || 7307d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 7317d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 732977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 7332fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 7347d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 7357d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 7362fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 7377d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 738977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 7397d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 7407d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 74107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Bergstatic void ieee80211_scan_state_suspend(struct ieee80211_local *local, 74207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg unsigned long *next_delay) 74307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg{ 74407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* switch back to the operating channel */ 7457ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->scan_chandef.chan = NULL; 74607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 74707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 748aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka /* disable PS */ 749aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_return(local); 75007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 75107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = HZ / 5; 75207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* afterwards, resume scan & go to next channel */ 75307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->next_scan_state = SCAN_RESUME; 75407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg} 75507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 75607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Bergstatic void ieee80211_scan_state_resume(struct ieee80211_local *local, 75707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg unsigned long *next_delay) 75807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg{ 759aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_stop_vifs(local); 76007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 76107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (local->ops->flush) { 76239ecc01d1bbe3de2cf5f01a81e176ea5160d3b95Johannes Berg ieee80211_flush_queues(local, NULL); 76307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = 0; 76407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg } else 76507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = HZ / 10; 76607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 76707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* remember when we left the operating channel */ 76807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->leave_oper_channel_time = jiffies; 76907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 77007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* advance to the next channel to be scanned */ 771de2ee84db6a0201278e35590821cd014cb71830aMohammed Shafi Shajakhan local->next_scan_state = SCAN_SET_CHANNEL; 77207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg} 77307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 774c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 7750a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7760a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 7770a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 778d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg struct ieee80211_sub_if_data *sdata; 7790a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 7808bd2a2489971d3bcdbae6d9d9e9414f04cb0543bEliad Peller bool aborted; 7810a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 782259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_lock(&local->mtx); 7838789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 784e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 785e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)); 786d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg 7878a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* When scanning on-channel, the first-callback means completed. */ 7888a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 7898a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 7908a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear goto out_complete; 7918a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 7928a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 793259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 7948789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 795259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 7968789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg } 7978789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 798259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (!sdata || !local->scan_req) 799259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 800f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 801fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 802f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 803f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 804f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 805f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 8060c2bef4621c5feb5bda9068c9964b2e9acf57017Monam Agarwal RCU_INIT_POINTER(local->scan_sdata, NULL); 807f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 808f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 809259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (rc) { 8103aed49ef17c7bc8397420529ac976fe058818e3dStanislaw Gruszka /* need to complete scan in cfg80211 */ 8113aed49ef17c7bc8397420529ac976fe058818e3dStanislaw Gruszka local->scan_req = req; 812259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 813259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 814259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka } else 815259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 816f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 817f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 8185bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 819f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 820f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 821f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 822f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 823c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan if (!ieee80211_sdata_running(sdata)) { 824c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan aborted = true; 825c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan goto out_complete; 826c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan } 827c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan 828977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 8292fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 830e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka /* if no more bands/channels left, complete scan */ 831e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 832e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka aborted = false; 833e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka goto out_complete; 834e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 835e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 836f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 8372fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 8382fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 8392fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 840f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 841f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 842f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 84307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg case SCAN_SUSPEND: 84407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_state_suspend(local, &next_delay); 845142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 84607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg case SCAN_RESUME: 84707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_state_resume(local, &next_delay); 848142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 849cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler case SCAN_ABORT: 850cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler aborted = true; 851cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler goto out_complete; 852f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 853f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 8540a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 85542935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 856d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg goto out; 857259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka 858259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout_complete: 8598bd2a2489971d3bcdbae6d9d9e9414f04cb0543bEliad Peller __ieee80211_scan_completed(&local->hw, aborted); 860259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout: 861259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_unlock(&local->mtx); 8620a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8630a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 864f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 865f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 8660a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 867f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 868de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 869a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&sdata->local->mtx); 870f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 871a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&sdata->local->mtx); 8720a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 873f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 8740a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8750a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 87634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszkaint ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 87734bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka const u8 *ssid, u8 ssid_len, 8787ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich struct ieee80211_channel *chan, 8797ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich enum nl80211_bss_scan_width scan_width) 8800a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 8810a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 882f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 883fb63bc41772259701a827e9a6117219a7393554fGertjan van Wingerde enum ieee80211_band band; 8842a5193119269062608582418deba7af82844159aJohannes Berg 885a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 8860a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 887f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 888f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 889f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 8909116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 891be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg /* fill internal scan request */ 892be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!chan) { 89334bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka int i, max_n; 89434bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka int n_ch = 0; 895be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 896be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 897be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!local->hw.wiphy->bands[band]) 898be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg continue; 89934bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 90034bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka max_n = local->hw.wiphy->bands[band]->n_channels; 90134bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka for (i = 0; i < max_n; i++) { 90234bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka struct ieee80211_channel *tmp_ch = 903be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg &local->hw.wiphy->bands[band]->channels[i]; 90434bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 9058fe02e167efa8ed4a4503a5eedc0f49fcb7e3eb9Luis R. Rodriguez if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 90634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka IEEE80211_CHAN_DISABLED)) 90734bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka continue; 90834bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 90934bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka local->int_scan_req->channels[n_ch] = tmp_ch; 91034bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka n_ch++; 911be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 912be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 913be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 91434bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka if (WARN_ON_ONCE(n_ch == 0)) 91534bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka goto unlock; 91634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 91734bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka local->int_scan_req->n_channels = n_ch; 918be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } else { 9198fe02e167efa8ed4a4503a5eedc0f49fcb7e3eb9Luis R. Rodriguez if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IR | 92034bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka IEEE80211_CHAN_DISABLED))) 92134bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka goto unlock; 92234bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 923be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[0] = chan; 924be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = 1; 925be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 926be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 927be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->ssids = &local->scan_ssid; 928be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_ssids = 1; 9297ca15a0ae865067aac8d36e27e0acbe4a8f1e70aSimon Wunderlich local->int_scan_req->scan_width = scan_width; 9305ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 9315ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 9329116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 9335ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 934f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 935a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&local->mtx); 936f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 9370a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 9385bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 9394136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka/* 9404136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 9414136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka */ 9425bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 9435bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 9445bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 945b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * We are canceling software scan, or deferred scan that was not 9464136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 9474136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 9484136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Regarding hardware scan: 9494136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 9504136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 9514136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 9524136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * driver which can use local->hw_scan_req 9534136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 9544136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 9554136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 9564136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 957b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * Hence we only call the cancel_hw_scan() callback, but the low-level 958b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * driver is still responsible for calling ieee80211_scan_completed() 959b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * after the scan was completed/aborted. 9605bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 9614136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka 962a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 963b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (!local->scan_req) 964b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller goto out; 965b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller 966a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach /* 967a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach * We have a scan running and the driver already reported completion, 968a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach * but the worker hasn't run yet or is stuck on the mutex - mark it as 969a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach * cancelled. 970a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach */ 971a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 972a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach test_bit(SCAN_COMPLETED, &local->scanning)) { 973a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach set_bit(SCAN_HW_CANCELLED, &local->scanning); 974a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach goto out; 975a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach } 976a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach 977b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 978a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach /* 979a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach * Make sure that __ieee80211_scan_completed doesn't trigger a 980a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach * scan on another band. 981a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach */ 982a754055a1296fcbe6f32de3a5eaca6efb2fd1865Emmanuel Grumbach set_bit(SCAN_HW_CANCELLED, &local->scanning); 983b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (local->ops->cancel_hw_scan) 984e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg drv_cancel_hw_scan(local, 985e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected(local->scan_sdata, 986e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx))); 987b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller goto out; 9884136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka } 989b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller 990b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller /* 991b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * If the work is currently running, it must be blocked on 992b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * the mutex, but we'll set scan_sdata = NULL and it'll 993b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * simply exit once it acquires the mutex. 994b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller */ 995b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller cancel_delayed_work(&local->scan_work); 996b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller /* and clean up */ 9978bd2a2489971d3bcdbae6d9d9e9414f04cb0543bEliad Peller __ieee80211_scan_completed(&local->hw, true); 998b856439b1b54358e580aaee5dbe683af5ada9403Eliad Pellerout: 999d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg mutex_unlock(&local->mtx); 10005bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 100179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 1002d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadelint __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1003d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel struct cfg80211_sched_scan_request *req) 100479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 100579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = sdata->local; 1006bca1e29fb54c51856dda6772d488d41b10ed91daDavid Spinadel struct ieee80211_sched_scan_ies sched_scan_ies = {}; 10072103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich struct cfg80211_chan_def chandef; 1008c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg int ret, i, iebufsz; 1009c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel struct ieee80211_scan_ies dummy_ie_desc; 1010c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg 1011e4dcbb375cd829e1649b12e0ab7d7e5b7efcb5a5David Spinadel iebufsz = local->scan_ies_len + req->ie_len; 101279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 1013d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel lockdep_assert_held(&local->mtx); 101479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 1015d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel if (!local->ops->sched_scan_start) 1016d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel return -ENOTSUPP; 101779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 101879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1019c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel u32 rate_masks[IEEE80211_NUM_BANDS] = {}; 1020c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel 1021d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov if (!local->hw.wiphy->bands[i]) 1022d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov continue; 1023d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov 1024c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); 102530dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg if (!sched_scan_ies.ie[i]) { 102679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOMEM; 102779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out_free; 102879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 102979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 10302103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 1031c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel rate_masks[i] = (u32) -1; 10322103dec14792be2c2194a454630b01120d30e5cbSimon Wunderlich 103330dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg sched_scan_ies.len[i] = 103430dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], 1035c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel iebufsz, &dummy_ie_desc, 1036c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel req->ie, req->ie_len, BIT(i), 1037c56ef6725068c0ce499e517409c0da226ef51b08David Spinadel rate_masks, &chandef); 103879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 103979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 104030dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1041d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel if (ret == 0) { 10425260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, sdata); 1043d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel local->sched_scan_req = req; 1044d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel } 104579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 104679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout_free: 104779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho while (i > 0) 104830dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg kfree(sched_scan_ies.ie[--i]); 1049d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 1050d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel if (ret) { 1051d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel /* Clean in case of failure after HW restart or upon resume. */ 10520c2bef4621c5feb5bda9068c9964b2e9acf57017Monam Agarwal RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1053d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel local->sched_scan_req = NULL; 1054d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel } 1055d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 1056d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel return ret; 1057d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel} 1058d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 1059d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadelint ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1060d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel struct cfg80211_sched_scan_request *req) 1061d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel{ 1062d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel struct ieee80211_local *local = sdata->local; 1063d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel int ret; 1064d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 1065d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel mutex_lock(&local->mtx); 1066d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 1067d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel if (rcu_access_pointer(local->sched_scan_sdata)) { 1068d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel mutex_unlock(&local->mtx); 1069d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel return -EBUSY; 1070d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel } 1071d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 1072d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel ret = __ieee80211_request_sched_scan_start(sdata, req); 1073d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 10745260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_unlock(&local->mtx); 107579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho return ret; 107679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 107779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 107885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelhoint ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) 107979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 108079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = sdata->local; 108130dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg int ret = 0; 108279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 10835260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_lock(&local->mtx); 108479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 108579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (!local->ops->sched_scan_stop) { 108679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOTSUPP; 108779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 108879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 108979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 1090d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel /* We don't want to restart sched scan anymore. */ 1091d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel local->sched_scan_req = NULL; 1092d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 109371228a1eabaf7fa4b2c3060cfee60875254cec14Alexander Bondar if (rcu_access_pointer(local->sched_scan_sdata)) { 109437e3308cb2b6933019d9d9c2045877d6d68d9c5aJohannes Berg ret = drv_sched_scan_stop(local, sdata); 109571228a1eabaf7fa4b2c3060cfee60875254cec14Alexander Bondar if (!ret) 109671228a1eabaf7fa4b2c3060cfee60875254cec14Alexander Bondar rcu_assign_pointer(local->sched_scan_sdata, NULL); 109771228a1eabaf7fa4b2c3060cfee60875254cec14Alexander Bondar } 109879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout: 10995260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_unlock(&local->mtx); 110079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 110179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho return ret; 110279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 110379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 110479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhovoid ieee80211_sched_scan_results(struct ieee80211_hw *hw) 110579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 110679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 110779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 110879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho trace_api_sched_scan_results(local); 110979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 111079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho cfg80211_sched_scan_results(hw->wiphy); 111179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 111279f460ca49d8d5700756ab7071c951311c7f29ccLuciano CoelhoEXPORT_SYMBOL(ieee80211_sched_scan_results); 111379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 1114f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Bergvoid ieee80211_sched_scan_end(struct ieee80211_local *local) 111585a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho{ 111685a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_lock(&local->mtx); 111785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 11185260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg if (!rcu_access_pointer(local->sched_scan_sdata)) { 111985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_unlock(&local->mtx); 112085a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho return; 112185a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho } 112285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 11230c2bef4621c5feb5bda9068c9964b2e9acf57017Monam Agarwal RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 112485a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 1125d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel /* If sched scan was aborted by the driver. */ 1126d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel local->sched_scan_req = NULL; 1127d43c6b6e6f2fcaebf198c499716e5e24d878fdd2David Spinadel 112885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_unlock(&local->mtx); 112985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 113085a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho cfg80211_sched_scan_stopped(local->hw.wiphy); 113185a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho} 113285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 1133f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Bergvoid ieee80211_sched_scan_stopped_work(struct work_struct *work) 1134f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg{ 1135f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg struct ieee80211_local *local = 1136f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg container_of(work, struct ieee80211_local, 1137f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg sched_scan_stopped_work); 1138f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg 1139f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg ieee80211_sched_scan_end(local); 1140f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg} 1141f6837ba8c98afcf28ec25f6863a8597274aeefd6Johannes Berg 114279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhovoid ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 114379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 114479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 114579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 114679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho trace_api_sched_scan_stopped(local); 114779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 114818db594a1005d908d995a2fc8f5a7bf4286fdca0Johannes Berg schedule_work(&local->sched_scan_stopped_work); 114979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 115079f460ca49d8d5700756ab7071c951311c7f29ccLuciano CoelhoEXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1151