scan.c revision 9c35d7d2368f54313b988a01c408e5cf863ffd9e
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; 692a5193119269062608582418deba7af82844159aJohannes Berg s32 signal = 0; 702a5193119269062608582418deba7af82844159aJohannes Berg 7177965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 722a5193119269062608582418deba7af82844159aJohannes Berg signal = rx_status->signal * 100; 7377965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 742a5193119269062608582418deba7af82844159aJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 752a5193119269062608582418deba7af82844159aJohannes Berg 760c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, 770c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg mgmt, len, signal, GFP_ATOMIC); 780c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!cbss) 7900d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg return NULL; 8000d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg 810c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg bss = (void *)cbss->priv; 825484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 83ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg if (beacon) 84ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg bss->device_ts_beacon = rx_status->device_timestamp; 85ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg else 86ef429dadf33feeb150098dbe84ccaa877e3261f6Johannes Berg bss->device_ts_presp = rx_status->device_timestamp; 878c358bcd097fa1f63e57fb82525ba52f4a537bfaJohannes Berg 88fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->parse_error) { 89fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (beacon) 90fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 91fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart else 92fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 93fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } else { 94fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (beacon) 95fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 96fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart else 97fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 98fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 99fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart 1005484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg /* save the ERP value so that it is available at association time */ 101fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->erp_info && elems->erp_info_len >= 1 && 102fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart (!elems->parse_error || 103fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 1045484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->erp_value = elems->erp_info[0]; 1053db1cd5c05f35fb43eb134df6f321de4e63141f2Rusty Russell bss->has_erp_value = true; 106fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 107fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_ERP; 1085484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1095484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 110f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka /* replace old supported rates if we get new values */ 111fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error || 112fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 113fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen = 0; 114fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->supp_rates) { 115fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = IEEE80211_MAX_SUPP_RATES; 116fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (clen > elems->supp_rates_len) 117fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = elems->supp_rates_len; 118fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart memcpy(bss->supp_rates, elems->supp_rates, clen); 119fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen += clen; 120fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 121fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->ext_supp_rates) { 122fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = IEEE80211_MAX_SUPP_RATES - srlen; 123fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (clen > elems->ext_supp_rates_len) 124fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = elems->ext_supp_rates_len; 125fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 126fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen); 127fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen += clen; 128fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 129fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (srlen) { 130fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->supp_rates_len = srlen; 131fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 132fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_RATES; 133fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 1345484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1355484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 136fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error || 137fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 138fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->wmm_used = elems->wmm_param || elems->wmm_info; 139fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->uapsd_supported = is_uapsd_supported(elems); 140fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 141fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_WMM; 142fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 1435484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1445484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg return bss; 1455484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 1460a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 147d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Bergvoid ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 14898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg{ 149f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 150d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg struct ieee80211_sub_if_data *sdata1, *sdata2; 151d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg struct ieee80211_mgmt *mgmt = (void *)skb->data; 152c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 15398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg u8 *elements; 15498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_channel *channel; 15598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg size_t baselen; 156d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg bool beacon; 15798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee802_11_elems elems; 15898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 159d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if (skb->len < 24 || 160d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg (!ieee80211_is_probe_resp(mgmt->frame_control) && 161d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg !ieee80211_is_beacon(mgmt->frame_control))) 162d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 16398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 164d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg sdata1 = rcu_dereference(local->scan_sdata); 165d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg sdata2 = rcu_dereference(local->sched_scan_sdata); 16698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 167d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if (likely(!sdata1 && !sdata2)) 168d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 16998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 170d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if (ieee80211_is_probe_resp(mgmt->frame_control)) { 17198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg /* ignore ProbeResp to foreign address */ 172d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && 173d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) 174d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 17598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.probe_resp.variable; 17798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 178d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg beacon = false; 17998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } else { 18098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 18198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.beacon.variable; 182d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg beacon = true; 18398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } 18498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (baselen > skb->len) 186d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 18798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 18998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 1900172bb75073e11a5aa9d8a953bdaefb8709f00c8Johannes Berg channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 19198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 193d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg return; 19498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 195d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg bss = ieee80211_bss_info_update(local, rx_status, 19698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt, skb->len, &elems, 197d45c41722a3eca639ced2c4c93665ced229b1da9Emmanuel Grumbach channel); 198d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen if (bss) 199d48b296850f25cb559cb9b907d6d8c09eca3e89dJohannes Berg ieee80211_rx_bss_put(local, bss); 20098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg} 20198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 2024d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg/* return false if no more work */ 2034d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Bergstatic bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2044d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg{ 2054d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2064d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg enum ieee80211_band band; 2074d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int i, ielen, n_chans; 2084d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2094d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg do { 2104d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2114d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return false; 2124d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2134d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg band = local->hw_scan_band; 2144d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans = 0; 2154d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg for (i = 0; i < req->n_channels; i++) { 2164d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (req->channels[i]->band == band) { 2174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->channels[n_chans] = 2184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->channels[i]; 2194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans++; 2204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2234d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band++; 2244d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } while (!n_chans); 2254d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2264d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_channels = n_chans; 2274d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2284d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 229c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->hw_scan_ies_bufsize, 2308ee3108075c9e9e2701493a245a754b8b0db8e57Johannes Berg req->ie, req->ie_len, band, 23185a237fe308405ee38eb9c6733571c49902ec229Johannes Berg req->rates[band], 0); 2324d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie_len = ielen; 233dcd83976bea3ae3bc0822ed26cf200d9d6203121Johannes Berg local->hw_scan_req->no_cck = req->no_cck; 2344d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2354d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return true; 2364d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg} 2374d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 238d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Bergstatic void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, 239e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka bool was_hw_scan) 2400a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2410a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 2420a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 243e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 2445bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 2456d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 2466d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 2476d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 2486d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 2496d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 2506d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 2516d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 2526d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 2535bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 254e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (WARN_ON(!local->scan_req)) 255d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg return; 256de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 2574d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 258e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg int rc; 259e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 260e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rc = drv_hw_scan(local, 261e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected(local->scan_sdata, 262e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)), 263e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg local->hw_scan_req); 264e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 2656eb11a9a311a0f7e5b9b66c18f7498a26c9ec206Stanislaw Gruszka if (rc == 0) 266d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg return; 2674d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2684d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2694d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 2704d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 271f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 2725ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 2732a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 2742a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 2753aa569c3fedbd0d16041d08bf6e89b8c43aee650Johannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 2762a5193119269062608582418deba7af82844159aJohannes Berg 277fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 27858905ca5b11a0ff3860f55b789cbbf052f7158a7Johannes Berg local->scan_channel = NULL; 279f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 28007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* Set power back to normal operating levels. */ 28107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_hw_config(local, 0); 282a0daa0e7592ada797d6835f11529097aabc27ad2Luis R. Rodriguez 283e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (!was_hw_scan) { 284e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_configure_filter(local); 285e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka drv_sw_scan_complete(local); 286aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_return(local); 287e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 2880a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 2895cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 290e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 2910a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 292469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 293472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 2942eb278e083549f4eb29838037004054b3b55df62Johannes Berg ieee80211_start_next_roc(local); 2950a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 2968789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 2978789d459bc5e837bf37d261453df96ef54018d7bJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 2988789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg{ 2998789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3008789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3018789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg trace_api_scan_completed(local, aborted); 3028789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3038789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3048789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg if (aborted) 3058789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3068789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3078789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg} 3080a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3090a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 310f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 311f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 312fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg /* Software scan is not supported in multi-channel cases */ 313fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg if (local->use_chanctx) 314fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg return -EOPNOTSUPP; 315fe57d9f5c0a2c1ef97ba8cdc42cfda5743f287b8Johannes Berg 316f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 317f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 318f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 319f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 320f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 321f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 322f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 323f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 324f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 325f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 326f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 327f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 328f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3292448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 330f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 331de312db345f9770b64ff39ef5a7f86f6358e93ccRajkumar Manoharan local->leave_oper_channel_time = jiffies; 332977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 333f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 334f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 335aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_stop_vifs(local); 336a80f7c0b088187c8471b441d461e937991870661Johannes Berg 3379c35d7d2368f54313b988a01c408e5cf863ffd9eSeth Forshee /* ensure nullfunc is transmitted before leaving operating channel */ 3389c35d7d2368f54313b988a01c408e5cf863ffd9eSeth Forshee drv_flush(local, false); 3399c35d7d2368f54313b988a01c408e5cf863ffd9eSeth Forshee 3403ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 341f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 34259bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear /* We need to set power level at maximum rate for scanning. */ 34359bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear ieee80211_hw_config(local, 0); 34459bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear 34542935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 34607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg &local->scan_work, 0); 347f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 348f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 349f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 350f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 351133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszkastatic bool ieee80211_can_scan(struct ieee80211_local *local, 352133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka struct ieee80211_sub_if_data *sdata) 353133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka{ 3542eb278e083549f4eb29838037004054b3b55df62Johannes Berg if (!list_empty(&local->roc_list)) 355133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return false; 356133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 357133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (sdata->vif.type == NL80211_IFTYPE_STATION && 358133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | 359133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka IEEE80211_STA_CONNECTION_POLL)) 360133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return false; 361133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 362133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return true; 363133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka} 364133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 365133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszkavoid ieee80211_run_deferred_scan(struct ieee80211_local *local) 366133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka{ 367133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka lockdep_assert_held(&local->mtx); 368133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 369133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (!local->scan_req || local->scanning) 370133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return; 371133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 372e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg if (!ieee80211_can_scan(local, 373e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected( 374e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg local->scan_sdata, 375e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)))) 376133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return; 377133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 378133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 379133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka round_jiffies_relative(0)); 380133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka} 381f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3828a690674e0601efbe9a7b16a5826fc522645cca3Ben Greearstatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 3838a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear unsigned long *next_delay) 3848a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear{ 3858a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear int i; 386e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg struct ieee80211_sub_if_data *sdata; 3878a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear enum ieee80211_band band = local->hw.conf.channel->band; 3886c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee u32 tx_flags; 3896c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee 3906c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 3916c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee if (local->scan_req->no_cck) 3926c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 3938a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 394e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 395316b6b5df77db801d62ec381cfae0c38ff84252cPeter Senna Tschudin lockdep_is_held(&local->mtx)); 396e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 3978a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear for (i = 0; i < local->scan_req->n_ssids; i++) 3988a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_send_probe_req( 3998a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear sdata, NULL, 4008a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ssids[i].ssid, 4018a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ssids[i].ssid_len, 4028a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ie, local->scan_req->ie_len, 4038a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->rates[band], false, 4046c17b77b67587b9f9e3070fb89fe98cef3187131Seth Forshee tx_flags, local->hw.conf.channel, true); 4058a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4068a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* 4078a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * After sending probe requests, wait for probe responses 4088a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * on the channel. 4098a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear */ 4108a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear *next_delay = IEEE80211_CHANNEL_TIME; 4118a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->next_scan_state = SCAN_DECISION; 4128a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear} 4138a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 414f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 415f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 416f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 417f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 418f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 419f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 420e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 421e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 422f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 423f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 424f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 425133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (!ieee80211_can_scan(local, sdata)) { 4266e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* wait for the work to finish/time out */ 427c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_req = req; 428e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 429c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg return 0; 430c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg } 431c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg 432f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 433f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 434f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 435c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + 436c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->scan_ies_len + 437c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg req->ie_len; 4384d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 4394d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4404d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 441c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->hw_scan_ies_bufsize, GFP_KERNEL); 4424d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 443f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 444f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4454d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ssids = req->ssids; 4464d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 4474d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 4484d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4494d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 4504d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie = ies; 451cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler local->hw_scan_req->flags = req->flags; 4524d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 4534d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 4546e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 4556e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* 4566e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * After allocating local->hw_scan_req, we must 4576e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * go through until ieee80211_prep_hw_scan(), so 4586e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * anything that might be changed here and leave 4596e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * this function early must not go after this 4606e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * allocation. 4616e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville */ 462f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 463f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 464f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 465e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 466f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4678a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if (local->ops->hw_scan) { 468fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 4698a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else if ((req->n_channels == 1) && 47055de908ab292c03f1eb280f51170ddb9c6b57e31Johannes Berg (req->channels[0] == local->_oper_channel)) { 4719b8648704358e42f9865cd6de7cedb5ac0db67e7Johannes Berg /* 4729b8648704358e42f9865cd6de7cedb5ac0db67e7Johannes Berg * If we are scanning only on the operating channel 4739b8648704358e42f9865cd6de7cedb5ac0db67e7Johannes Berg * then we do not need to stop normal activities 4748a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear */ 4758a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear unsigned long next_delay; 4768a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4778a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 4788a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4798a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_recalc_idle(local); 4808a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4818a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Notify driver scan is starting, keep order of operations 4828a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * same as normal software scan, in case that matters. */ 4838a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear drv_sw_scan_start(local); 4848a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4858a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_configure_filter(local); /* accept probe-responses */ 4868a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4878a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* We need to ensure power level is at max for scanning. */ 4888a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_hw_config(local, 0); 4898a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4908a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if ((req->channels[0]->flags & 4918a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear IEEE80211_CHAN_PASSIVE_SCAN) || 4928a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear !local->scan_req->n_ssids) { 4938a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 4948a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else { 4958a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_scan_state_send_probe(local, &next_delay); 4968a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay = IEEE80211_CHANNEL_TIME; 4978a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 4988a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4998a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Now, just wait a bit and we are all done! */ 5008a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 5018a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay); 5028a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear return 0; 5038a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else { 5048a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Do normal software scan */ 505fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 5068a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 5076e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 5085cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 509f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5104d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 5114d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 512a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 5134d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 514f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 515f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 516f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 5174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 5184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 519fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 520f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5215cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 5225cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 523f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 524e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 525f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 526f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 527f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 528f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 529f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 530df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaastatic unsigned long 531df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaaieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 532df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa{ 533df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 534df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * TODO: channel switching also consumes quite some time, 535df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * add that delay as well to get a better estimation 536df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 537df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 538df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 539df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 540df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa} 541df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 542e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszkastatic void ieee80211_scan_state_decision(struct ieee80211_local *local, 543e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka unsigned long *next_delay) 5447d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 545142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 546df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool tx_empty = true; 547df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool bad_latency; 548142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 549df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa struct ieee80211_channel *next_chan; 550cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler enum mac80211_scan_state next_scan_state; 551142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 552df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 553df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface is associated, 554df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface has pending tx frames 555df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * and grab the lowest used beacon interval 556df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 557142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 558142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 5599607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 560142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 561142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 562142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 563142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 564142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 565df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 566df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 567df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa tx_empty = false; 568df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa break; 569df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa } 570142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 571142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 572142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 573142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 574142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 575b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear next_chan = local->scan_req->channels[local->scan_channel_idx]; 576b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 577a80f7c0b088187c8471b441d461e937991870661Johannes Berg /* 57807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * we're currently scanning a different channel, let's 57907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * see if we can scan another channel without interfering 58007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * with the current traffic situation. 58107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * 5823f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka * Keep good latency, do not stay off-channel more than 125 ms. 583a80f7c0b088187c8471b441d461e937991870661Johannes Berg */ 584a80f7c0b088187c8471b441d461e937991870661Johannes Berg 58507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg bad_latency = time_after(jiffies + 5863f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka ieee80211_scan_get_channel_time(next_chan), 5873f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka local->leave_oper_channel_time + HZ / 8); 588142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 589cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler if (associated && !tx_empty) { 590cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 591cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_ABORT; 592cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler else 593cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_SUSPEND; 5943f892b61a8cf6a85bc389c8d13209d686a4f6403Stanislaw Gruszka } else if (associated && bad_latency) { 595cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_SUSPEND; 596cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler } else { 597cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler next_scan_state = SCAN_SET_CHANNEL; 598cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler } 599cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler 600cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler local->next_scan_state = next_scan_state; 601142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 60207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = 0; 603142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 604142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 6052fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 6062fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 6072fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 6082fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 6092fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 6102fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 6117d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 6127d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 6137d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 614584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg local->scan_channel = chan; 615b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 61607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 61707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg skip = 1; 6187d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6197d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 6207d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 6217d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6220ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 6230ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 6240ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 6252fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6260ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 6277d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6287d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6297d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6307d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6317d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 6327d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 6337d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 6347d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 6357d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 6367d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 6377d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6387d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6397d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 6407d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 641977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6422fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6437d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6447d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6452fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 6467d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 647977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6487d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6497d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 65007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Bergstatic void ieee80211_scan_state_suspend(struct ieee80211_local *local, 65107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg unsigned long *next_delay) 65207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg{ 65307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* switch back to the operating channel */ 65407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->scan_channel = NULL; 65507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 65607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 657aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka /* disable PS */ 658aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_return(local); 65907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 66007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = HZ / 5; 66107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* afterwards, resume scan & go to next channel */ 66207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->next_scan_state = SCAN_RESUME; 66307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg} 66407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 66507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Bergstatic void ieee80211_scan_state_resume(struct ieee80211_local *local, 66607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg unsigned long *next_delay) 66707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg{ 668aacde9ee45225f7e0b90960f479aef83c66bfdc0Stanislaw Gruszka ieee80211_offchannel_stop_vifs(local); 66907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 67007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (local->ops->flush) { 67107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg drv_flush(local, false); 67207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = 0; 67307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg } else 67407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = HZ / 10; 67507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 67607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* remember when we left the operating channel */ 67707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->leave_oper_channel_time = jiffies; 67807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 67907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* advance to the next channel to be scanned */ 680de2ee84db6a0201278e35590821cd014cb71830aMohammed Shafi Shajakhan local->next_scan_state = SCAN_SET_CHANNEL; 68107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg} 68207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 683c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 6840a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 6850a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 6860a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 687d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg struct ieee80211_sub_if_data *sdata; 6880a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 689d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg bool aborted, hw_scan; 6900a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 691259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_lock(&local->mtx); 6928789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 693e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 694e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)); 695d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg 6968a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* When scanning on-channel, the first-callback means completed. */ 6978a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 6988a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 6998a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear goto out_complete; 7008a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 7018a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 702259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 7038789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 704259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 7058789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg } 7068789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 707259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (!sdata || !local->scan_req) 708259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 709f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 710fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 711f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 712f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 713f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 714f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 715e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 716f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 717f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 718259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (rc) { 7193aed49ef17c7bc8397420529ac976fe058818e3dStanislaw Gruszka /* need to complete scan in cfg80211 */ 7203aed49ef17c7bc8397420529ac976fe058818e3dStanislaw Gruszka local->scan_req = req; 721259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 722259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 723259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka } else 724259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 725f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 726f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 7275bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 7285bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg * Avoid re-scheduling when the sdata is going away. 7295bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg */ 7309607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) { 731259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 732259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 733f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 7340a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 735f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa /* 736f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 737f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 738f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 739f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 740c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan if (!ieee80211_sdata_running(sdata)) { 741c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan aborted = true; 742c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan goto out_complete; 743c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan } 744c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan 745977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 7462fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 747e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka /* if no more bands/channels left, complete scan */ 748e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 749e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka aborted = false; 750e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka goto out_complete; 751e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 752e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 753f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 7542fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 7552fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7562fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 757f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 758f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 759f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 76007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg case SCAN_SUSPEND: 76107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_state_suspend(local, &next_delay); 762142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 76307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg case SCAN_RESUME: 76407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_state_resume(local, &next_delay); 765142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 766cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler case SCAN_ABORT: 767cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler aborted = true; 768cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0Sam Leffler goto out_complete; 769f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 770f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 7710a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 77242935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 773d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg goto out; 774259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka 775259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout_complete: 776e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 777d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg __ieee80211_scan_completed(&local->hw, aborted, hw_scan); 778259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout: 779259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_unlock(&local->mtx); 7800a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7810a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 782f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 783f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 7840a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 785f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 786de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 787a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&sdata->local->mtx); 788f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 789a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&sdata->local->mtx); 7900a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 791f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 7920a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7930a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 79434bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszkaint ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 79534bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka const u8 *ssid, u8 ssid_len, 79634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka struct ieee80211_channel *chan) 7970a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7980a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 799f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 800fb63bc41772259701a827e9a6117219a7393554fGertjan van Wingerde enum ieee80211_band band; 8012a5193119269062608582418deba7af82844159aJohannes Berg 802a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 8030a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 804f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 805f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 806f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 8079116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 808be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg /* fill internal scan request */ 809be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!chan) { 81034bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka int i, max_n; 81134bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka int n_ch = 0; 812be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 813be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 814be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!local->hw.wiphy->bands[band]) 815be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg continue; 81634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 81734bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka max_n = local->hw.wiphy->bands[band]->n_channels; 81834bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka for (i = 0; i < max_n; i++) { 81934bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka struct ieee80211_channel *tmp_ch = 820be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg &local->hw.wiphy->bands[band]->channels[i]; 82134bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 82234bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | 82334bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka IEEE80211_CHAN_DISABLED)) 82434bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka continue; 82534bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 82634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka local->int_scan_req->channels[n_ch] = tmp_ch; 82734bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka n_ch++; 828be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 829be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 830be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 83134bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka if (WARN_ON_ONCE(n_ch == 0)) 83234bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka goto unlock; 83334bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 83434bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka local->int_scan_req->n_channels = n_ch; 835be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } else { 83634bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | 83734bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka IEEE80211_CHAN_DISABLED))) 83834bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka goto unlock; 83934bcf71502413f8903ade93746f2d0f04b937a78Stanislaw Gruszka 840be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[0] = chan; 841be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = 1; 842be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 843be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 844be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->ssids = &local->scan_ssid; 845be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_ssids = 1; 8465ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 8475ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 8489116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 8495ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 850f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 851a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&local->mtx); 852f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 8530a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8545bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8554136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka/* 8564136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 8574136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka */ 8585bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 8595bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 8605bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 861b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * We are canceling software scan, or deferred scan that was not 8624136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 8634136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8644136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Regarding hardware scan: 8654136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 8664136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 8674136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 8684136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * driver which can use local->hw_scan_req 8694136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8704136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 8714136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 8724136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 873b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * Hence we only call the cancel_hw_scan() callback, but the low-level 874b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * driver is still responsible for calling ieee80211_scan_completed() 875b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * after the scan was completed/aborted. 8765bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 8774136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka 878a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 879b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (!local->scan_req) 880b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller goto out; 881b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller 882b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 883b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (local->ops->cancel_hw_scan) 884e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg drv_cancel_hw_scan(local, 885e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected(local->scan_sdata, 886e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx))); 887b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller goto out; 8884136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka } 889b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller 890b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller /* 891b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * If the work is currently running, it must be blocked on 892b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * the mutex, but we'll set scan_sdata = NULL and it'll 893b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * simply exit once it acquires the mutex. 894b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller */ 895b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller cancel_delayed_work(&local->scan_work); 896b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller /* and clean up */ 897b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller __ieee80211_scan_completed(&local->hw, true, false); 898b856439b1b54358e580aaee5dbe683af5ada9403Eliad Pellerout: 899d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg mutex_unlock(&local->mtx); 9005bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 90179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 90279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoint ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 90379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct cfg80211_sched_scan_request *req) 90479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 90579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = sdata->local; 906bca1e29fb54c51856dda6772d488d41b10ed91daDavid Spinadel struct ieee80211_sched_scan_ies sched_scan_ies = {}; 907c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg int ret, i, iebufsz; 908c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg 909c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg iebufsz = 2 + IEEE80211_MAX_SSID_LEN + 910c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg local->scan_ies_len + req->ie_len; 91179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9125260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_lock(&local->mtx); 91379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9145260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg if (rcu_access_pointer(local->sched_scan_sdata)) { 91579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -EBUSY; 91679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 91779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 91879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 91979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (!local->ops->sched_scan_start) { 92079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOTSUPP; 92179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 92279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 92379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 92479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 925d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov if (!local->hw.wiphy->bands[i]) 926d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov continue; 927d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov 928c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); 92930dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg if (!sched_scan_ies.ie[i]) { 93079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOMEM; 93179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out_free; 93279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 93379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 93430dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg sched_scan_ies.len[i] = 93530dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], 936c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg iebufsz, req->ie, req->ie_len, 937c604b9f219422e969fe371cc7259de34c3c5601dJohannes Berg i, (u32) -1, 0); 93879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 93979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 94030dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 94130dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg if (ret == 0) 9425260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, sdata); 94379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 94479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout_free: 94579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho while (i > 0) 94630dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg kfree(sched_scan_ies.ie[--i]); 94779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout: 9485260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_unlock(&local->mtx); 94979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho return ret; 95079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 95179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 95285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelhoint ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) 95379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 95479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = sdata->local; 95530dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg int ret = 0; 95679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9575260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_lock(&local->mtx); 95879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 95979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (!local->ops->sched_scan_stop) { 96079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOTSUPP; 96179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 96279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 96379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 96430dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg if (rcu_access_pointer(local->sched_scan_sdata)) 96585a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho drv_sched_scan_stop(local, sdata); 96630dd3edf97abda301150c8cf26fed21e53e3a9ceJohannes Berg 96779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout: 9685260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_unlock(&local->mtx); 96979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 97079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho return ret; 97179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 97279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 97379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhovoid ieee80211_sched_scan_results(struct ieee80211_hw *hw) 97479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 97579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 97679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 97779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho trace_api_sched_scan_results(local); 97879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 97979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho cfg80211_sched_scan_results(hw->wiphy); 98079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 98179f460ca49d8d5700756ab7071c951311c7f29ccLuciano CoelhoEXPORT_SYMBOL(ieee80211_sched_scan_results); 98279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 98385a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelhovoid ieee80211_sched_scan_stopped_work(struct work_struct *work) 98485a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho{ 98585a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho struct ieee80211_local *local = 98685a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho container_of(work, struct ieee80211_local, 98785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho sched_scan_stopped_work); 98885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 98985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_lock(&local->mtx); 99085a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 9915260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg if (!rcu_access_pointer(local->sched_scan_sdata)) { 99285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_unlock(&local->mtx); 99385a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho return; 99485a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho } 99585a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 9965260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, NULL); 99785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 99885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_unlock(&local->mtx); 99985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 100085a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho cfg80211_sched_scan_stopped(local->hw.wiphy); 100185a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho} 100285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 100379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhovoid ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 100479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 100579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 100679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 100779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho trace_api_sched_scan_stopped(local); 100879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 100985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); 101079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 101179f460ca49d8d5700756ab7071c951311c7f29ccLuciano CoelhoEXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1012