scan.c revision 5260a5b2c3524f198ea062fe0a6a4faa724e6a9d
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) 3096f7e73938da744e718ce4817dd3e7e424624654Helmut Schaa#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) 310a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3200d3f14cf9f12c21428121026a5e1d5f65926447Johannes Bergstatic void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) 335484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 340c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg struct ieee80211_bss *bss = (void *)cbss->priv; 355484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 365484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg kfree(bss_mesh_id(bss)); 375484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg kfree(bss_mesh_cfg(bss)); 385484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 395484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 405484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergvoid ieee80211_rx_bss_put(struct ieee80211_local *local, 41c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss) 425484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 430c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!bss) 440c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg return; 450c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); 465484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 475484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 48ab13315af97919fae0e014748105fdc2e30afb2dKalle Valostatic bool is_uapsd_supported(struct ieee802_11_elems *elems) 49ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo{ 50ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo u8 qos_info; 51ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 52ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo if (elems->wmm_info && elems->wmm_info_len == 7 53ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo && elems->wmm_info[5] == 1) 54ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo qos_info = elems->wmm_info[6]; 55ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo else if (elems->wmm_param && elems->wmm_param_len == 24 56ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo && elems->wmm_param[5] == 1) 57ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo qos_info = elems->wmm_param[6]; 58ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo else 59ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo /* no valid wmm information or parameter element found */ 60ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo return false; 61ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 62ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 63ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo} 64ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 65c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergstruct ieee80211_bss * 665484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergieee80211_bss_info_update(struct ieee80211_local *local, 675484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_rx_status *rx_status, 685484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_mgmt *mgmt, 695484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg size_t len, 705484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee802_11_elems *elems, 712a5193119269062608582418deba7af82844159aJohannes Berg struct ieee80211_channel *channel, 722a5193119269062608582418deba7af82844159aJohannes Berg bool beacon) 735484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 740c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg struct cfg80211_bss *cbss; 75c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 76f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka int clen, srlen; 772a5193119269062608582418deba7af82844159aJohannes Berg s32 signal = 0; 782a5193119269062608582418deba7af82844159aJohannes Berg 7977965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 802a5193119269062608582418deba7af82844159aJohannes Berg signal = rx_status->signal * 100; 8177965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 822a5193119269062608582418deba7af82844159aJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 832a5193119269062608582418deba7af82844159aJohannes Berg 840c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, 850c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg mgmt, len, signal, GFP_ATOMIC); 865484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 870c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!cbss) 8800d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg return NULL; 8900d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg 900c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cbss->free_priv = ieee80211_rx_bss_free; 910c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg bss = (void *)cbss->priv; 925484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 93fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->parse_error) { 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 } else { 99fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (beacon) 100fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 101fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart else 102fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 103fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 104fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart 1055484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg /* save the ERP value so that it is available at association time */ 106fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->erp_info && elems->erp_info_len >= 1 && 107fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart (!elems->parse_error || 108fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 1095484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->erp_value = elems->erp_info[0]; 1103db1cd5c05f35fb43eb134df6f321de4e63141f2Rusty Russell bss->has_erp_value = true; 111fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 112fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_ERP; 1135484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1145484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 115fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->tim && (!elems->parse_error || 116fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_DTIM))) { 1175484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_tim_ie *tim_ie = 1185484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg (struct ieee80211_tim_ie *)elems->tim; 1195484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->dtim_period = tim_ie->dtim_period; 120fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 121fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_DTIM; 1225484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1235484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 124e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg /* If the beacon had no TIM IE, or it was invalid, use 1 */ 125e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg if (beacon && !bss->dtim_period) 126e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg bss->dtim_period = 1; 127e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg 128f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka /* replace old supported rates if we get new values */ 129fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error || 130fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 131fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen = 0; 132fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->supp_rates) { 133fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = IEEE80211_MAX_SUPP_RATES; 134fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (clen > elems->supp_rates_len) 135fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = elems->supp_rates_len; 136fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart memcpy(bss->supp_rates, elems->supp_rates, clen); 137fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen += clen; 138fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 139fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (elems->ext_supp_rates) { 140fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = IEEE80211_MAX_SUPP_RATES - srlen; 141fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (clen > elems->ext_supp_rates_len) 142fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen = elems->ext_supp_rates_len; 143fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 144fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart clen); 145fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart srlen += clen; 146fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 147fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (srlen) { 148fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->supp_rates_len = srlen; 149fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 150fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_RATES; 151fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 1525484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1535484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 154fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error || 155fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 156fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->wmm_used = elems->wmm_param || elems->wmm_info; 157fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->uapsd_supported = is_uapsd_supported(elems); 158fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart if (!elems->parse_error) 159fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart bss->valid_data |= IEEE80211_BSS_VALID_WMM; 160fcff4f108dce0692410f390a05565f4b1b84577fPaul Stewart } 1615484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1625484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (!beacon) 1635484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->last_probe_resp = jiffies; 1645484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1655484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg return bss; 1665484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 1670a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 16898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Bergieee80211_rx_result 169f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Bergieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 17098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg{ 171f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 17298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_mgmt *mgmt; 173c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 17498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg u8 *elements; 17598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_channel *channel; 17698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg size_t baselen; 17798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg int freq; 17898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg __le16 fc; 17998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bool presp, beacon = false; 18098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee802_11_elems elems; 18198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 2) 18398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_UNUSABLE; 18498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt = (struct ieee80211_mgmt *) skb->data; 18698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg fc = mgmt->frame_control; 18798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (ieee80211_is_ctl(fc)) 18998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 19098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 24) 192306fe9384f06d31219778cece2d3c646146e7bb6Luciano Coelho return RX_CONTINUE; 19398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = ieee80211_is_probe_resp(fc); 19598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (presp) { 19698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg /* ignore ProbeResp to foreign address */ 197b203ca39126bad99583c908be587df067820a1eaJoe Perches if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 19898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 19998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = true; 20198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.probe_resp.variable; 20298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 20398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } else { 20498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg beacon = ieee80211_is_beacon(fc); 20598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 20698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.beacon.variable; 20798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } 20898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!presp && !beacon) 21098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 21198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 21298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (baselen > skb->len) 21398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 21498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 21598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 21698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 21798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (elems.ds_params && elems.ds_params_len == 1) 21859eb21a6504731fc16db4cf9463065dd61093e08Bruno Randolf freq = ieee80211_channel_to_frequency(elems.ds_params[0], 21959eb21a6504731fc16db4cf9463065dd61093e08Bruno Randolf rx_status->band); 22098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg else 22198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = rx_status->freq; 22298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 22398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 22498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 22598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 22698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 22798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 22898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bss = ieee80211_bss_info_update(sdata->local, rx_status, 22998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt, skb->len, &elems, 2302a5193119269062608582418deba7af82844159aJohannes Berg channel, beacon); 231d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen if (bss) 232d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen ieee80211_rx_bss_put(sdata->local, bss); 23398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 23407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (channel == sdata->local->oper_channel) 235b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear return RX_CONTINUE; 236b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 23798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg dev_kfree_skb(skb); 23898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_QUEUED; 23998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg} 24098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 2414d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg/* return false if no more work */ 2424d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Bergstatic bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2434d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg{ 2444d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2454d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg enum ieee80211_band band; 2464d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int i, ielen, n_chans; 2474d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2484d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg do { 2494d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2504d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return false; 2514d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2524d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg band = local->hw_scan_band; 2534d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans = 0; 2544d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg for (i = 0; i < req->n_channels; i++) { 2554d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (req->channels[i]->band == band) { 2564d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->channels[n_chans] = 2574d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->channels[i]; 2584d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans++; 2594d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2604d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2614d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2624d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band++; 2634d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } while (!n_chans); 2644d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2654d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_channels = n_chans; 2664d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2674d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 2688ee3108075c9e9e2701493a245a754b8b0db8e57Johannes Berg req->ie, req->ie_len, band, 26985a237fe308405ee38eb9c6733571c49902ec229Johannes Berg req->rates[band], 0); 2704d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie_len = ielen; 271dcd83976bea3ae3bc0822ed26cf200d9d6203121Johannes Berg local->hw_scan_req->no_cck = req->no_cck; 2724d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2734d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return true; 2744d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg} 2754d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 276d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Bergstatic void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, 277e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka bool was_hw_scan) 2780a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2790a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 2800a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 281e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 2825bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 2836d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 2846d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 2856d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 2866d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 2876d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 2886d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 2896d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 2906d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 2915bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 292e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (WARN_ON(!local->scan_req)) 293d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg return; 294de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 2954d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 296e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg int rc; 297e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 298e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rc = drv_hw_scan(local, 299e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected(local->scan_sdata, 300e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)), 301e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg local->hw_scan_req); 302e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 3036eb11a9a311a0f7e5b9b66c18f7498a26c9ec206Stanislaw Gruszka if (rc == 0) 304d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg return; 3054d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 3064d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 3074d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 3084d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 309f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3105ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 3112a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 3122a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 31315db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 3142a5193119269062608582418deba7af82844159aJohannes Berg 315fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 31658905ca5b11a0ff3860f55b789cbbf052f7158a7Johannes Berg local->scan_channel = NULL; 317f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 31807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* Set power back to normal operating levels. */ 31907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_hw_config(local, 0); 320a0daa0e7592ada797d6835f11529097aabc27ad2Luis R. Rodriguez 321e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (!was_hw_scan) { 322e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_configure_filter(local); 323e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka drv_sw_scan_complete(local); 324e76aadc572288a158ae18ae1c10fe395c7bca066Johannes Berg ieee80211_offchannel_return(local, true); 325e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 3260a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3275cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 328e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 3290a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 330469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 331472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 3322eb278e083549f4eb29838037004054b3b55df62Johannes Berg ieee80211_start_next_roc(local); 3330a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 3348789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3358789d459bc5e837bf37d261453df96ef54018d7bJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 3368789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg{ 3378789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3388789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3398789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg trace_api_scan_completed(local, aborted); 3408789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3418789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3428789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg if (aborted) 3438789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3448789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3458789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg} 3460a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3470a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 348f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 349f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 350f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 351f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 352f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 353f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 354f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 355f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 356f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 357f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 358f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 359f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 360f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 361f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 362f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3632448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 364f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 365de312db345f9770b64ff39ef5a7f86f6358e93ccRajkumar Manoharan local->leave_oper_channel_time = jiffies; 366977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 367f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 368f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 36907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_offchannel_stop_vifs(local, true); 370a80f7c0b088187c8471b441d461e937991870661Johannes Berg 3713ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 372f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 37359bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear /* We need to set power level at maximum rate for scanning. */ 37459bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear ieee80211_hw_config(local, 0); 37559bdf3b0fe7a183f18ce94696259c4c76abb4568Ben Greear 37642935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 37707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg &local->scan_work, 0); 378f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 379f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 380f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 381f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 382133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszkastatic bool ieee80211_can_scan(struct ieee80211_local *local, 383133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka struct ieee80211_sub_if_data *sdata) 384133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka{ 3852eb278e083549f4eb29838037004054b3b55df62Johannes Berg if (!list_empty(&local->roc_list)) 386133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return false; 387133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 388133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (sdata->vif.type == NL80211_IFTYPE_STATION && 389133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | 390133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka IEEE80211_STA_CONNECTION_POLL)) 391133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return false; 392133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 393133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return true; 394133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka} 395133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 396133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszkavoid ieee80211_run_deferred_scan(struct ieee80211_local *local) 397133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka{ 398133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka lockdep_assert_held(&local->mtx); 399133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 400133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (!local->scan_req || local->scanning) 401133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return; 402133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 403e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg if (!ieee80211_can_scan(local, 404e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected( 405e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg local->scan_sdata, 406e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)))) 407133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka return; 408133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka 409133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 410133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka round_jiffies_relative(0)); 411133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka} 412f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4138a690674e0601efbe9a7b16a5826fc522645cca3Ben Greearstatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 4148a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear unsigned long *next_delay) 4158a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear{ 4168a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear int i; 417e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg struct ieee80211_sub_if_data *sdata; 4188a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear enum ieee80211_band band = local->hw.conf.channel->band; 4198a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 420e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 421e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx));; 422e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg 4238a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear for (i = 0; i < local->scan_req->n_ssids; i++) 4248a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_send_probe_req( 4258a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear sdata, NULL, 4268a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ssids[i].ssid, 4278a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ssids[i].ssid_len, 4288a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->ie, local->scan_req->ie_len, 4298a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->rates[band], false, 4308a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->scan_req->no_cck); 4318a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4328a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* 4338a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * After sending probe requests, wait for probe responses 4348a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * on the channel. 4358a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear */ 4368a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear *next_delay = IEEE80211_CHANNEL_TIME; 4378a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->next_scan_state = SCAN_DECISION; 4388a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear} 4398a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 440f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 441f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 442f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 443f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 444f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 445f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 446e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 447e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 448f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 449f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 450f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 451133d40f9a22bdfd2617a446f1e3209537c5415ecStanislaw Gruszka if (!ieee80211_can_scan(local, sdata)) { 4526e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* wait for the work to finish/time out */ 453c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_req = req; 454e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 455c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg return 0; 456c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg } 457c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg 458f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 459f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 460f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4614d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 4624d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4634d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 4644d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 4654d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie_len, GFP_KERNEL); 4664d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 467f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 468f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4694d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ssids = req->ssids; 4704d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 4714d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 4724d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4734d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 4744d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie = ies; 4754d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 4764d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 4776e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 4786e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* 4796e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * After allocating local->hw_scan_req, we must 4806e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * go through until ieee80211_prep_hw_scan(), so 4816e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * anything that might be changed here and leave 4826e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * this function early must not go after this 4836e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * allocation. 4846e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville */ 485f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 486f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 487f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 488e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, sdata); 489f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4908a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if (local->ops->hw_scan) { 491fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 4928a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else if ((req->n_channels == 1) && 4938a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear (req->channels[0]->center_freq == 4948a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear local->hw.conf.channel->center_freq)) { 4958a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 4968a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* If we are scanning only on the current channel, then 4978a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * we do not need to stop normal activities 4988a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear */ 4998a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear unsigned long next_delay; 5008a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5018a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 5028a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5038a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_recalc_idle(local); 5048a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5058a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Notify driver scan is starting, keep order of operations 5068a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear * same as normal software scan, in case that matters. */ 5078a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear drv_sw_scan_start(local); 5088a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5098a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_configure_filter(local); /* accept probe-responses */ 5108a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5118a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* We need to ensure power level is at max for scanning. */ 5128a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_hw_config(local, 0); 5138a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5148a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if ((req->channels[0]->flags & 5158a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear IEEE80211_CHAN_PASSIVE_SCAN) || 5168a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear !local->scan_req->n_ssids) { 5178a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 5188a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else { 5198a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_scan_state_send_probe(local, &next_delay); 5208a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay = IEEE80211_CHANNEL_TIME; 5218a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 5228a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 5238a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Now, just wait a bit and we are all done! */ 5248a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 5258a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear next_delay); 5268a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear return 0; 5278a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } else { 5288a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* Do normal software scan */ 529fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 5308a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 5316e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 5325cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 533f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5344d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 5354d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 536a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 5374d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 538f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 539f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 540f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 5414d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 5424d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 543fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 544f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5455cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 5465cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 547f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 548e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 549f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 550f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 551f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 552f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 553f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 554df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaastatic unsigned long 555df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaaieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 556df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa{ 557df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 558df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * TODO: channel switching also consumes quite some time, 559df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * add that delay as well to get a better estimation 560df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 561df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 562df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 563df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 564df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa} 565df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 566e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszkastatic void ieee80211_scan_state_decision(struct ieee80211_local *local, 567e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka unsigned long *next_delay) 5687d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 569142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 570df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool tx_empty = true; 571df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool bad_latency; 572df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool listen_int_exceeded; 573df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa unsigned long min_beacon_int = 0; 574142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 575df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa struct ieee80211_channel *next_chan; 576142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 577df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 578df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface is associated, 579df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface has pending tx frames 580df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * and grab the lowest used beacon interval 581df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 582142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 583142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 5849607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 585142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 586142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 587142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 588142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 589142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 590df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 591df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (sdata->vif.bss_conf.beacon_int < 592df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa min_beacon_int || min_beacon_int == 0) 593df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa min_beacon_int = 594df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa sdata->vif.bss_conf.beacon_int; 595df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 596df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 597df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa tx_empty = false; 598df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa break; 599df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa } 600142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 601142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 602142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 603142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 604142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 605b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear next_chan = local->scan_req->channels[local->scan_channel_idx]; 606b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 607a80f7c0b088187c8471b441d461e937991870661Johannes Berg /* 60807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * we're currently scanning a different channel, let's 60907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * see if we can scan another channel without interfering 61007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * with the current traffic situation. 61107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * 61207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * Since we don't know if the AP has pending frames for us 61307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * we can only check for our tx queues and use the current 61407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * pm_qos requirements for rx. Hence, if no tx traffic occurs 61507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * at all we will scan as many channels in a row as the pm_qos 61607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * latency allows us to. Additionally we also check for the 61707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * currently negotiated listen interval to prevent losing 61807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * frames unnecessarily. 61907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * 62007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * Otherwise switch back to the operating channel. 621a80f7c0b088187c8471b441d461e937991870661Johannes Berg */ 622a80f7c0b088187c8471b441d461e937991870661Johannes Berg 62307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg bad_latency = time_after(jiffies + 62407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_get_channel_time(next_chan), 62507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->leave_oper_channel_time + 62607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); 627df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 62807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg listen_int_exceeded = time_after(jiffies + 62907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_get_channel_time(next_chan), 63007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->leave_oper_channel_time + 63107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg usecs_to_jiffies(min_beacon_int * 1024) * 63207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->hw.conf.listen_interval); 633142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 63407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (associated && (!tx_empty || bad_latency || listen_int_exceeded)) 63507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->next_scan_state = SCAN_SUSPEND; 63607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg else 63707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->next_scan_state = SCAN_SET_CHANNEL; 638142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 63907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = 0; 640142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 641142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 6422fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 6432fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 6442fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 6452fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 6462fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 6472fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 6487d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 6497d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 6507d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 651584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg local->scan_channel = chan; 652b23b025fe246f3acc2988eb6d400df34c27cb8aeBen Greear 65307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 65407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg skip = 1; 6557d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6567d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 6577d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 6587d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6590ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 6600ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 6610ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 6622fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6630ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 6647d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6657d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6667d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6677d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6687d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 6697d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 6707d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 6717d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 6727d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 6737d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 6747d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6757d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6767d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 6777d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 678977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6792fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6807d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6817d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6822fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 6837d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 684977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6857d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6867d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 68707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Bergstatic void ieee80211_scan_state_suspend(struct ieee80211_local *local, 68807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg unsigned long *next_delay) 68907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg{ 69007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* switch back to the operating channel */ 69107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->scan_channel = NULL; 69207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 69307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 69407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* 69507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * Re-enable vifs and beaconing. Leave PS 69607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * in off-channel state..will put that back 69707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg * on-channel at the end of scanning. 69807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg */ 699e76aadc572288a158ae18ae1c10fe395c7bca066Johannes Berg ieee80211_offchannel_return(local, false); 70007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 70107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = HZ / 5; 70207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* afterwards, resume scan & go to next channel */ 70307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->next_scan_state = SCAN_RESUME; 70407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg} 70507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 70607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Bergstatic void ieee80211_scan_state_resume(struct ieee80211_local *local, 70707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg unsigned long *next_delay) 70807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg{ 70907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* PS already is in off-channel mode */ 71007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_offchannel_stop_vifs(local, false); 71107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 71207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg if (local->ops->flush) { 71307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg drv_flush(local, false); 71407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = 0; 71507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg } else 71607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg *next_delay = HZ / 10; 71707ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 71807ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* remember when we left the operating channel */ 71907ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg local->leave_oper_channel_time = jiffies; 72007ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 72107ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg /* advance to the next channel to be scanned */ 722de2ee84db6a0201278e35590821cd014cb71830aMohammed Shafi Shajakhan local->next_scan_state = SCAN_SET_CHANNEL; 72307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg} 72407ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg 725c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 7260a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7270a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 7280a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 729d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg struct ieee80211_sub_if_data *sdata; 7300a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 731d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg bool aborted, hw_scan; 7320a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 733259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_lock(&local->mtx); 7348789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 735e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg sdata = rcu_dereference_protected(local->scan_sdata, 736e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx)); 737d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg 7388a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear /* When scanning on-channel, the first-callback means completed. */ 7398a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 7408a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 7418a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear goto out_complete; 7428a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear } 7438a690674e0601efbe9a7b16a5826fc522645cca3Ben Greear 744259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 7458789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 746259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 7478789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg } 7488789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 749259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (!sdata || !local->scan_req) 750259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 751f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 752fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 753f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 754f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 755f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 756f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 757e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_assign_pointer(local->scan_sdata, NULL); 758f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 759f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 760259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (rc) { 7613aed49ef17c7bc8397420529ac976fe058818e3dStanislaw Gruszka /* need to complete scan in cfg80211 */ 7623aed49ef17c7bc8397420529ac976fe058818e3dStanislaw Gruszka local->scan_req = req; 763259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 764259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 765259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka } else 766259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 767f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 768f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 7695bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 7705bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg * Avoid re-scheduling when the sdata is going away. 7715bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg */ 7729607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) { 773259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 774259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 775f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 7760a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 777f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa /* 778f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 779f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 780f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 781f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 782c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan if (!ieee80211_sdata_running(sdata)) { 783c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan aborted = true; 784c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan goto out_complete; 785c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan } 786c29acf201007a6d73223f864f52406eb5ba19933Rajkumar Manoharan 787977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 7882fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 789e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka /* if no more bands/channels left, complete scan */ 790e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 791e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka aborted = false; 792e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka goto out_complete; 793e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 794e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 795f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 7962fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 7972fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7982fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 799f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 800f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 801f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 80207ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg case SCAN_SUSPEND: 80307ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_state_suspend(local, &next_delay); 804142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 80507ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg case SCAN_RESUME: 80607ef03ee8b280a536b38ccfe512b9556996f0492Johannes Berg ieee80211_scan_state_resume(local, &next_delay); 807142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 808f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 809f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 8100a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 81142935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 812d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg goto out; 813259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka 814259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout_complete: 815e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 816d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg __ieee80211_scan_completed(&local->hw, aborted, hw_scan); 817259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout: 818259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_unlock(&local->mtx); 8190a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8200a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 821f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 822f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 8230a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 824f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 825de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 826a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&sdata->local->mtx); 827f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 828a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&sdata->local->mtx); 8290a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 830f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 8310a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8320a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 833f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 834be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg const u8 *ssid, u8 ssid_len, 835be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg struct ieee80211_channel *chan) 8360a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 8370a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 838f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 839fb63bc41772259701a827e9a6117219a7393554fGertjan van Wingerde enum ieee80211_band band; 8402a5193119269062608582418deba7af82844159aJohannes Berg 841a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 8420a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 843f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 844f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 845f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 8469116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 847be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg /* fill internal scan request */ 848be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!chan) { 849be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg int i, nchan = 0; 850be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 851be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 852be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!local->hw.wiphy->bands[band]) 853be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg continue; 854be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (i = 0; 855be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg i < local->hw.wiphy->bands[band]->n_channels; 856be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg i++) { 857be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[nchan] = 858be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg &local->hw.wiphy->bands[band]->channels[i]; 859be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg nchan++; 860be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 861be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 862be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 863be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = nchan; 864be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } else { 865be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[0] = chan; 866be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = 1; 867be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 868be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 869be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->ssids = &local->scan_ssid; 870be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_ssids = 1; 8715ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 8725ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 8739116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 8745ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 875f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 876a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&local->mtx); 877f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 8780a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8795bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8804136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka/* 8814136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 8824136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka */ 8835bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 8845bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 8855bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 886b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * We are canceling software scan, or deferred scan that was not 8874136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 8884136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8894136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Regarding hardware scan: 8904136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 8914136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 8924136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 8934136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * driver which can use local->hw_scan_req 8944136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8954136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 8964136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 8974136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 898b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * Hence we only call the cancel_hw_scan() callback, but the low-level 899b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * driver is still responsible for calling ieee80211_scan_completed() 900b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * after the scan was completed/aborted. 9015bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 9024136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka 903a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 904b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (!local->scan_req) 905b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller goto out; 906b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller 907b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 908b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller if (local->ops->cancel_hw_scan) 909e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg drv_cancel_hw_scan(local, 910e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg rcu_dereference_protected(local->scan_sdata, 911e2fd5dbc1c7031be5b5de043bcc0a18c7a59a68aJohannes Berg lockdep_is_held(&local->mtx))); 912b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller goto out; 9134136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka } 914b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller 915b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller /* 916b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * If the work is currently running, it must be blocked on 917b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * the mutex, but we'll set scan_sdata = NULL and it'll 918b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller * simply exit once it acquires the mutex. 919b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller */ 920b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller cancel_delayed_work(&local->scan_work); 921b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller /* and clean up */ 922b856439b1b54358e580aaee5dbe683af5ada9403Eliad Peller __ieee80211_scan_completed(&local->hw, true, false); 923b856439b1b54358e580aaee5dbe683af5ada9403Eliad Pellerout: 924d07bfd8b6f20a81d7ec65c50f35b053d9e3aa740Johannes Berg mutex_unlock(&local->mtx); 9255bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 92679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 92779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoint ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 92879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct cfg80211_sched_scan_request *req) 92979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 93079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = sdata->local; 93179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho int ret, i; 93279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9335260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_lock(&local->mtx); 93479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9355260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg if (rcu_access_pointer(local->sched_scan_sdata)) { 93679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -EBUSY; 93779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 93879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 93979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 94079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (!local->ops->sched_scan_start) { 94179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOTSUPP; 94279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 94379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 94479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 94579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 946d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov if (!local->hw.wiphy->bands[i]) 947d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov continue; 948d811b3d5566f1441b321a1219c260124b209e0bdArik Nemtsov 94979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho local->sched_scan_ies.ie[i] = kzalloc(2 + 95079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho IEEE80211_MAX_SSID_LEN + 9511186980dafcd14d0e257a4dd6990cefdc6f3e362Luciano Coelho local->scan_ies_len + 9521186980dafcd14d0e257a4dd6990cefdc6f3e362Luciano Coelho req->ie_len, 95379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho GFP_KERNEL); 95479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (!local->sched_scan_ies.ie[i]) { 95579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOMEM; 95679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out_free; 95779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 95879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 95979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho local->sched_scan_ies.len[i] = 96079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ieee80211_build_preq_ies(local, 96179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho local->sched_scan_ies.ie[i], 96279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho req->ie, req->ie_len, i, 96379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho (u32) -1, 0); 96479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 96579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 96679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = drv_sched_scan_start(local, sdata, req, 96779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho &local->sched_scan_ies); 96879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (ret == 0) { 9695260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, sdata); 97079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 97179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 97279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 97379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout_free: 97479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho while (i > 0) 97579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho kfree(local->sched_scan_ies.ie[--i]); 97679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout: 9775260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_unlock(&local->mtx); 97879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho return ret; 97979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 98079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 98185a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelhoint ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) 98279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 98379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = sdata->local; 98479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho int ret = 0, i; 98579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9865260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_lock(&local->mtx); 98779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 98879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho if (!local->ops->sched_scan_stop) { 98979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho ret = -ENOTSUPP; 99079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho goto out; 99179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 99279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 9935260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg if (rcu_access_pointer(local->sched_scan_sdata)) { 99479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) 99579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho kfree(local->sched_scan_ies.ie[i]); 99679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 99785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho drv_sched_scan_stop(local, sdata); 9985260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, NULL); 99979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho } 100079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhoout: 10015260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg mutex_unlock(&local->mtx); 100279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 100379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho return ret; 100479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 100579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 100679f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhovoid ieee80211_sched_scan_results(struct ieee80211_hw *hw) 100779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 100879f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 100979f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 101079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho trace_api_sched_scan_results(local); 101179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 101279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho cfg80211_sched_scan_results(hw->wiphy); 101379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 101479f460ca49d8d5700756ab7071c951311c7f29ccLuciano CoelhoEXPORT_SYMBOL(ieee80211_sched_scan_results); 101579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 101685a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelhovoid ieee80211_sched_scan_stopped_work(struct work_struct *work) 101785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho{ 101885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho struct ieee80211_local *local = 101985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho container_of(work, struct ieee80211_local, 102085a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho sched_scan_stopped_work); 102185a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho int i; 102285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 102385a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_lock(&local->mtx); 102485a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 10255260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg if (!rcu_access_pointer(local->sched_scan_sdata)) { 102685a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_unlock(&local->mtx); 102785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho return; 102885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho } 102985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 103085a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho for (i = 0; i < IEEE80211_NUM_BANDS; i++) 103185a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho kfree(local->sched_scan_ies.ie[i]); 103285a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 10335260a5b2c3524f198ea062fe0a6a4faa724e6a9dJohannes Berg rcu_assign_pointer(local->sched_scan_sdata, NULL); 103485a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 103585a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho mutex_unlock(&local->mtx); 103685a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 103785a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho cfg80211_sched_scan_stopped(local->hw.wiphy); 103885a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho} 103985a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho 104079f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelhovoid ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 104179f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho{ 104279f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho struct ieee80211_local *local = hw_to_local(hw); 104379f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 104479f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho trace_api_sched_scan_stopped(local); 104579f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho 104685a9994a0a6cba1a6cc6af4bd3ebd85f778be0feLuciano Coelho ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); 104779f460ca49d8d5700756ab7071c951311c7f29ccLuciano Coelho} 104879f460ca49d8d5700756ab7071c951311c7f29ccLuciano CoelhoEXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1049