scan.c revision f8965467f366fd18f01feafb5db10512d7b4422c
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> 16078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg#include <linux/rtnetlink.h> 17df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa#include <linux/pm_qos_params.h> 18df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa#include <net/sch_generic.h> 195a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 200a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include <net/mac80211.h> 210a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 220a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include "ieee80211_i.h" 232448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg#include "driver-ops.h" 245484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg#include "mesh.h" 250a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 260a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#define IEEE80211_PROBE_DELAY (HZ / 33) 270a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#define IEEE80211_CHANNEL_TIME (HZ / 33) 2896f7e73938da744e718ce4817dd3e7e424624654Helmut Schaa#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) 290a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 30c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergstruct ieee80211_bss * 315484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, 325484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg u8 *ssid, u8 ssid_len) 335484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 340c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg struct cfg80211_bss *cbss; 350c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg 360c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cbss = cfg80211_get_bss(local->hw.wiphy, 370c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg ieee80211_get_channel(local->hw.wiphy, freq), 380c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg bssid, ssid, ssid_len, 0, 0); 390c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!cbss) 400c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg return NULL; 410c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg return (void *)cbss->priv; 425484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 435484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 4400d3f14cf9f12c21428121026a5e1d5f65926447Johannes Bergstatic void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) 455484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 460c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg struct ieee80211_bss *bss = (void *)cbss->priv; 475484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 485484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg kfree(bss_mesh_id(bss)); 495484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg kfree(bss_mesh_cfg(bss)); 505484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 515484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 525484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergvoid ieee80211_rx_bss_put(struct ieee80211_local *local, 53c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss) 545484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 550c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!bss) 560c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg return; 570c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); 585484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 595484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 60ab13315af97919fae0e014748105fdc2e30afb2dKalle Valostatic bool is_uapsd_supported(struct ieee802_11_elems *elems) 61ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo{ 62ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo u8 qos_info; 63ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 64ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo if (elems->wmm_info && elems->wmm_info_len == 7 65ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo && elems->wmm_info[5] == 1) 66ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo qos_info = elems->wmm_info[6]; 67ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo else if (elems->wmm_param && elems->wmm_param_len == 24 68ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo && elems->wmm_param[5] == 1) 69ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo qos_info = elems->wmm_param[6]; 70ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo else 71ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo /* no valid wmm information or parameter element found */ 72ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo return false; 73ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 74ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 75ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo} 76ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo 77c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergstruct ieee80211_bss * 785484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergieee80211_bss_info_update(struct ieee80211_local *local, 795484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_rx_status *rx_status, 805484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_mgmt *mgmt, 815484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg size_t len, 825484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee802_11_elems *elems, 832a5193119269062608582418deba7af82844159aJohannes Berg struct ieee80211_channel *channel, 842a5193119269062608582418deba7af82844159aJohannes Berg bool beacon) 855484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 860c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg struct cfg80211_bss *cbss; 87c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 88f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka int clen, srlen; 892a5193119269062608582418deba7af82844159aJohannes Berg s32 signal = 0; 902a5193119269062608582418deba7af82844159aJohannes Berg 9177965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 922a5193119269062608582418deba7af82844159aJohannes Berg signal = rx_status->signal * 100; 9377965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 942a5193119269062608582418deba7af82844159aJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 952a5193119269062608582418deba7af82844159aJohannes Berg 960c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, 970c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg mgmt, len, signal, GFP_ATOMIC); 985484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 990c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg if (!cbss) 10000d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg return NULL; 10100d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg 1020c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg cbss->free_priv = ieee80211_rx_bss_free; 1030c1ad2cac1cb54db38fd4cc1822965071ee83f6eJohannes Berg bss = (void *)cbss->priv; 1045484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1055484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg /* save the ERP value so that it is available at association time */ 1065484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->erp_info && elems->erp_info_len >= 1) { 1075484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->erp_value = elems->erp_info[0]; 1085484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->has_erp_value = 1; 1095484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1105484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1115484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->tim) { 1125484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_tim_ie *tim_ie = 1135484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg (struct ieee80211_tim_ie *)elems->tim; 1145484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->dtim_period = tim_ie->dtim_period; 1155484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1165484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 117f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka /* replace old supported rates if we get new values */ 118f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka srlen = 0; 1195484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->supp_rates) { 120f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES; 1215484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (clen > elems->supp_rates_len) 1225484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = elems->supp_rates_len; 123f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka memcpy(bss->supp_rates, elems->supp_rates, clen); 124f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka srlen += clen; 1255484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1265484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->ext_supp_rates) { 127f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES - srlen; 1285484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (clen > elems->ext_supp_rates_len) 1295484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = elems->ext_supp_rates_len; 130f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen); 131f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka srlen += clen; 1325484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 133f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka if (srlen) 134f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka bss->supp_rates_len = srlen; 1355484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1365484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->wmm_used = elems->wmm_param || elems->wmm_info; 137ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo bss->uapsd_supported = is_uapsd_supported(elems); 1385484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1395484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (!beacon) 1405484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->last_probe_resp = jiffies; 1415484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1425484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg return bss; 1435484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 1440a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 14598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Bergieee80211_rx_result 146f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Bergieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 14798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg{ 148f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 14998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_mgmt *mgmt; 150c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 15198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg u8 *elements; 15298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_channel *channel; 15398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg size_t baselen; 15498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg int freq; 15598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg __le16 fc; 15698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bool presp, beacon = false; 15798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee802_11_elems elems; 15898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 15998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 2) 16098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_UNUSABLE; 16198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt = (struct ieee80211_mgmt *) skb->data; 16398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg fc = mgmt->frame_control; 16498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (ieee80211_is_ctl(fc)) 16698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 16798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 24) 16998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 17098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = ieee80211_is_probe_resp(fc); 17298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (presp) { 17398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg /* ignore ProbeResp to foreign address */ 17447846c9b0c10808d9337d2e7d09361f3e0a0a71aJohannes Berg if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 17598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 17698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = true; 17898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.probe_resp.variable; 17998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 18098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } else { 18198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg beacon = ieee80211_is_beacon(fc); 18298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 18398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.beacon.variable; 18498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } 18598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!presp && !beacon) 18798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 18898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (baselen > skb->len) 19098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 19198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 19398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (elems.ds_params && elems.ds_params_len == 1) 19598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = ieee80211_channel_to_frequency(elems.ds_params[0]); 19698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg else 19798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = rx_status->freq; 19898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 20098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 20298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 20398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bss = ieee80211_bss_info_update(sdata->local, rx_status, 20598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt, skb->len, &elems, 2062a5193119269062608582418deba7af82844159aJohannes Berg channel, beacon); 207d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen if (bss) 208d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen ieee80211_rx_bss_put(sdata->local, bss); 20998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 21098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg dev_kfree_skb(skb); 21198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_QUEUED; 21298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg} 21398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 2144d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg/* return false if no more work */ 2154d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Bergstatic bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2164d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg{ 2174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg enum ieee80211_band band; 2194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int i, ielen, n_chans; 2204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg do { 2224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2234d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return false; 2244d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2254d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg band = local->hw_scan_band; 2264d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans = 0; 2274d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg for (i = 0; i < req->n_channels; i++) { 2284d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (req->channels[i]->band == band) { 2294d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->channels[n_chans] = 2304d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->channels[i]; 2314d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans++; 2324d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2334d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2344d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2354d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band++; 2364d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } while (!n_chans); 2374d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2384d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_channels = n_chans; 2394d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2404d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 2414d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie, req->ie_len, band); 2424d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie_len = ielen; 2434d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2444d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return true; 2454d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg} 2464d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2472a5193119269062608582418deba7af82844159aJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 2480a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2490a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 250f3b85252f081581a8f257545ed748062dce7798bJohannes Berg bool was_hw_scan; 2510a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 252b5878a2dc5e7e7f031a52c3e15b571224cb6b540Johannes Berg trace_api_scan_completed(local, aborted); 253b5878a2dc5e7e7f031a52c3e15b571224cb6b540Johannes Berg 254f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 2555bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 2566d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 2576d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 2586d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 2596d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 2606d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 2616d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 2626d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 2636d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 2645bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 265f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (WARN_ON(!local->scan_req)) { 266f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 267f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 268de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg } 269de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 2704d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 2714d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 2724d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ieee80211_queue_delayed_work(&local->hw, 2734d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg &local->scan_work, 0); 2744d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg mutex_unlock(&local->scan_mtx); 2754d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return; 2764d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2774d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2784d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 2794d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 280f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 2815ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 2822a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 2832a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 28415db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 2852a5193119269062608582418deba7af82844159aJohannes Berg 286fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 28758905ca5b11a0ff3860f55b789cbbf052f7158a7Johannes Berg local->scan_channel = NULL; 288f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 289f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* we only have to protect scan_req and hw/sw scan */ 290f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 291f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 292e8975581f63870be42ff4662b293d1b0c8c21350Johannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 2935cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg if (was_hw_scan) 2945cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg goto done; 2950a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 2963ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 2970a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 2982448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_complete(local); 29980e775bf08f1915870fbb0c1c7a45a3fdc291721Michael Buesch 300b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_return(local, true); 3010a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3020a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg done: 3035cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 3040a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 305469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 306472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 30781ac3462d346ee7aaf037a35156b0a7a354e98cfJohannes Berg ieee80211_queue_work(&local->hw, &local->work_work); 3080a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 3090a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3100a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 311f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 312f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 313f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 314f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 315f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 316f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 317f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 318f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 319f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 320f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 321f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 322f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 323f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 324f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 325f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3262448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 327f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 328b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_stop_beaconing(local); 329f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 330df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time = 0; 331977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 332f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 333f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 334a80f7c0b088187c8471b441d461e937991870661Johannes Berg drv_flush(local, false); 335a80f7c0b088187c8471b441d461e937991870661Johannes Berg 3363ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 337f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 33842935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 33942935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez &local->scan_work, 34042935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez IEEE80211_CHANNEL_TIME); 341f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 342f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 343f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 344f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 345f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 346f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 347f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 348f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 349f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 350f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 351f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 352f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 353f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 354f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3556e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville if (!list_empty(&local->work_list)) { 3566e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* wait for the work to finish/time out */ 357c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_req = req; 358c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_sdata = sdata; 359c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg return 0; 360c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg } 361c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg 362f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 363f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 364f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3654d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 3664d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 3674d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 3684d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 3694d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie_len, GFP_KERNEL); 3704d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 371f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 372f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3734d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ssids = req->ssids; 3744d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 3754d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 3764d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 3774d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 3784d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie = ies; 3794d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 3804d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 3816e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 3826e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* 3836e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * After allocating local->hw_scan_req, we must 3846e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * go through until ieee80211_prep_hw_scan(), so 3856e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * anything that might be changed here and leave 3866e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * this function early must not go after this 3876e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * allocation. 3886e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville */ 389f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 390f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 391f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 392f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = sdata; 393f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 394f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) 395fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 396f3b85252f081581a8f257545ed748062dce7798bJohannes Berg else 397fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 3986e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 399f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 400f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Kicking off the scan need not be protected, 401f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * only the scan variable stuff, since now 402f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * local->scan_req is assigned and other callers 403f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * will abort their scan attempts. 404f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 4056e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * This avoids too many locking dependencies 4066e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * so that the scan completed calls have more 4076e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * locking freedom. 408f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 4095cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 4105cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 411f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 412f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4134d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 4144d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 415a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 4164d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 417f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 418f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 419f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 420f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 421f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 4224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 4234d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 424fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 425f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4265cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 4275cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 428f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 429f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = NULL; 430f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 431f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 432f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 433f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 434f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 435df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaastatic unsigned long 436df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaaieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 437df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa{ 438df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 439df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * TODO: channel switching also consumes quite some time, 440df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * add that delay as well to get a better estimation 441df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 442df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 443df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 444df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 445df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa} 446df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 4472fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic int ieee80211_scan_state_decision(struct ieee80211_local *local, 4482fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 4497d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 450142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 451df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool tx_empty = true; 452df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool bad_latency; 453df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool listen_int_exceeded; 454df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa unsigned long min_beacon_int = 0; 455142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 456df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa struct ieee80211_channel *next_chan; 457142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 458142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* if no more bands/channels left, complete scan and advance to the idle state */ 4597d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (local->scan_channel_idx >= local->scan_req->n_channels) { 4607d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_scan_completed(&local->hw, false); 4617d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa return 1; 4627d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 4632fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 464df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 465df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface is associated, 466df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface has pending tx frames 467df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * and grab the lowest used beacon interval 468df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 469142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 470142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 4719607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 472142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 473142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 474142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 475142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 476142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 477df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 478df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (sdata->vif.bss_conf.beacon_int < 479df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa min_beacon_int || min_beacon_int == 0) 480df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa min_beacon_int = 481df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa sdata->vif.bss_conf.beacon_int; 482df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 483df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 484df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa tx_empty = false; 485df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa break; 486df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa } 487142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 488142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 489142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 490142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 491142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 492142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (local->scan_channel) { 493142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 494142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're currently scanning a different channel, let's 495df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * see if we can scan another channel without interfering 496df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * with the current traffic situation. 497df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * 498df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * Since we don't know if the AP has pending frames for us 499df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * we can only check for our tx queues and use the current 500df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * pm_qos requirements for rx. Hence, if no tx traffic occurs 501df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * at all we will scan as many channels in a row as the pm_qos 502df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * latency allows us to. Additionally we also check for the 503df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * currently negotiated listen interval to prevent losing 504df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * frames unnecessarily. 505df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * 506df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * Otherwise switch back to the operating channel. 507142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 508df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa next_chan = local->scan_req->channels[local->scan_channel_idx]; 509df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 510df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bad_latency = time_after(jiffies + 511df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa ieee80211_scan_get_channel_time(next_chan), 512df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time + 513f8965467f366fd18f01feafb5db10512d7b4422cLinus Torvalds usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); 514df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 515df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa listen_int_exceeded = time_after(jiffies + 516df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa ieee80211_scan_get_channel_time(next_chan), 517df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time + 518df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa usecs_to_jiffies(min_beacon_int * 1024) * 519df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->hw.conf.listen_interval); 520df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 521df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (associated && ( !tx_empty || bad_latency || 522df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa listen_int_exceeded)) 523977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; 524142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa else 525977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 526142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } else { 527142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 528142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're on the operating channel currently, let's 529142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * leave that channel now to scan another one 530142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 531977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; 532142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 533142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 5342fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa *next_delay = 0; 5352fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return 0; 5362fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa} 5372fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 538142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, 539142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 540142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 541b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_stop_station(local); 542142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 543142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __set_bit(SCAN_OFF_CHANNEL, &local->scanning); 544142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 545a80f7c0b088187c8471b441d461e937991870661Johannes Berg /* 546a80f7c0b088187c8471b441d461e937991870661Johannes Berg * What if the nullfunc frames didn't arrive? 547a80f7c0b088187c8471b441d461e937991870661Johannes Berg */ 548a80f7c0b088187c8471b441d461e937991870661Johannes Berg drv_flush(local, false); 549a80f7c0b088187c8471b441d461e937991870661Johannes Berg if (local->ops->flush) 550a80f7c0b088187c8471b441d461e937991870661Johannes Berg *next_delay = 0; 551a80f7c0b088187c8471b441d461e937991870661Johannes Berg else 552a80f7c0b088187c8471b441d461e937991870661Johannes Berg *next_delay = HZ / 10; 553a80f7c0b088187c8471b441d461e937991870661Johannes Berg 554df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* remember when we left the operating channel */ 555df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time = jiffies; 556df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 557142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* advance to the next channel to be scanned */ 558977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 559142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 560142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 561142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, 562142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 563142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 564142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* switch back to the operating channel */ 565142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa local->scan_channel = NULL; 566142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 567142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 568142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 569b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen * Only re-enable station mode interface now; beaconing will be 570b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen * re-enabled once the full scan has been completed. 571142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 572b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_return(local, false); 573142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 574142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); 575142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 576142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa *next_delay = HZ / 5; 577977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 578142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 579142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 5802fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 5812fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 5822fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 5832fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 5842fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 5852fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 5867d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 5877d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 5887d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 589584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg local->scan_channel = chan; 590584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 5917d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 1; 5927d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 5937d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 5947d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 5957d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 5960ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 5970ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 5980ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 5992fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6000ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 6017d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6027d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6037d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6047d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6057d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 6067d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 6077d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 6087d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 6097d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 6107d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 6117d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6127d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6137d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 6147d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 615977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6162fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6177d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6187d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6192fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 6207d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 621977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6227d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6237d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6247d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaastatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 6257d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa unsigned long *next_delay) 6267d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 6277d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa int i; 6287d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6297d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6307d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa for (i = 0; i < local->scan_req->n_ssids; i++) 6317d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_send_probe_req( 6327d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa sdata, NULL, 6337d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid, 6347d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid_len, 6357d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ie, local->scan_req->ie_len); 6367d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6377d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6387d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * After sending probe requests, wait for probe responses 6397d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * on the channel. 6407d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6417d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_CHANNEL_TIME; 642977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6437d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6447d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 645c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 6460a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 6470a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 6480a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 6490a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6500a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 6510a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 652f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 653f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (!sdata || !local->scan_req) { 654f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 655f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 656f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 657f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 6584d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_req) { 659a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg int rc = drv_hw_scan(local, sdata, local->hw_scan_req); 6604d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg mutex_unlock(&local->scan_mtx); 6614d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (rc) 6624d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ieee80211_scan_completed(&local->hw, true); 6634d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return; 6644d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 6654d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 666fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 667f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 668f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 669f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 670f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 67115db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 672f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 673f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 674f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 675f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 676f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) 677f3b85252f081581a8f257545ed748062dce7798bJohannes Berg ieee80211_scan_completed(&local->hw, true); 678f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 679f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 680f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 681f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 682f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 6835bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 6845bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg * Avoid re-scheduling when the sdata is going away. 6855bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg */ 6869607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) { 687f3b85252f081581a8f257545ed748062dce7798bJohannes Berg ieee80211_scan_completed(&local->hw, true); 6880a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg return; 689f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 6900a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 691f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa /* 692f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 693f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 694f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 695f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 696977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 6972fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 6982fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa if (ieee80211_scan_state_decision(local, &next_delay)) 699f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa return; 700f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 7012fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 7022fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7032fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 704f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 705f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 706f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 707142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_LEAVE_OPER_CHANNEL: 708142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_leave_oper_channel(local, &next_delay); 709142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 710142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_ENTER_OPER_CHANNEL: 711142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_enter_oper_channel(local, &next_delay); 712142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 713f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 714f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 7150a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 71642935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 7170a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7180a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 719f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 720f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 7210a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 722f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 723de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 724f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&sdata->local->scan_mtx); 725f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 726f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&sdata->local->scan_mtx); 7270a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 728f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 7290a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7300a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 731f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 732be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg const u8 *ssid, u8 ssid_len, 733be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg struct ieee80211_channel *chan) 7340a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7350a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 736f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 737be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg enum nl80211_band band; 7382a5193119269062608582418deba7af82844159aJohannes Berg 739f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 7400a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 741f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 742f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 743f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 7449116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 745be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg /* fill internal scan request */ 746be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!chan) { 747be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg int i, nchan = 0; 748be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 749be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 750be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!local->hw.wiphy->bands[band]) 751be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg continue; 752be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (i = 0; 753be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg i < local->hw.wiphy->bands[band]->n_channels; 754be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg i++) { 755be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[nchan] = 756be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg &local->hw.wiphy->bands[band]->channels[i]; 757be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg nchan++; 758be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 759be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 760be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 761be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = nchan; 762be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } else { 763be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[0] = chan; 764be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = 1; 765be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 766be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 767be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->ssids = &local->scan_ssid; 768be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_ssids = 1; 7695ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 7705ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 7719116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 7725ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 773f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 774f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 775f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 7760a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7775bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7785bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 7795bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 78015db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg bool abortscan; 7815bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7825bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg cancel_delayed_work_sync(&local->scan_work); 7835bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7845bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 7855bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg * Only call this function when a scan can't be 7865bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg * queued -- mostly at suspend under RTNL. 7875bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 7885bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg mutex_lock(&local->scan_mtx); 78915db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || 79015db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg (!local->scanning && local->scan_req); 7915bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg mutex_unlock(&local->scan_mtx); 7925bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 79315db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg if (abortscan) 7945bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg ieee80211_scan_completed(&local->hw, true); 7955bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 796