scan.c revision 4136c4224ccf1907d309e1cdfaefef9da97dbc5e
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 117e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg /* If the beacon had no TIM IE, or it was invalid, use 1 */ 118e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg if (beacon && !bss->dtim_period) 119e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg bss->dtim_period = 1; 120e5b900d228b76d445a4240d9aeb3cd8f79205a91Johannes Berg 121f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka /* replace old supported rates if we get new values */ 122f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka srlen = 0; 1235484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->supp_rates) { 124f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES; 1255484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (clen > elems->supp_rates_len) 1265484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = elems->supp_rates_len; 127f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka memcpy(bss->supp_rates, elems->supp_rates, clen); 128f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka srlen += clen; 1295484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1305484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->ext_supp_rates) { 131f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka clen = IEEE80211_MAX_SUPP_RATES - srlen; 1325484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (clen > elems->ext_supp_rates_len) 1335484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = elems->ext_supp_rates_len; 134f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen); 135f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka srlen += clen; 1365484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 137f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka if (srlen) 138f0b058b61711ebf5be94d6865ca7b2c259b71d37Stanislaw Gruszka bss->supp_rates_len = srlen; 1395484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1405484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->wmm_used = elems->wmm_param || elems->wmm_info; 141ab13315af97919fae0e014748105fdc2e30afb2dKalle Valo bss->uapsd_supported = is_uapsd_supported(elems); 1425484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1435484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (!beacon) 1445484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->last_probe_resp = jiffies; 1455484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1465484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg return bss; 1475484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 1480a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 14998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Bergieee80211_rx_result 150f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Bergieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 15198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg{ 152f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 15398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_mgmt *mgmt; 154c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 15598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg u8 *elements; 15698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_channel *channel; 15798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg size_t baselen; 15898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg int freq; 15998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg __le16 fc; 16098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bool presp, beacon = false; 16198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee802_11_elems elems; 16298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 2) 16498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_UNUSABLE; 16598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt = (struct ieee80211_mgmt *) skb->data; 16798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg fc = mgmt->frame_control; 16898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (ieee80211_is_ctl(fc)) 17098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 17198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 24) 17398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 17498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = ieee80211_is_probe_resp(fc); 17698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (presp) { 17798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg /* ignore ProbeResp to foreign address */ 17847846c9b0c10808d9337d2e7d09361f3e0a0a71aJohannes Berg if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 17998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 18098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = true; 18298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.probe_resp.variable; 18398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 18498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } else { 18598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg beacon = ieee80211_is_beacon(fc); 18698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 18798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.beacon.variable; 18898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } 18998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!presp && !beacon) 19198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 19298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (baselen > skb->len) 19498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 19598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 19798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 19898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (elems.ds_params && elems.ds_params_len == 1) 19998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = ieee80211_channel_to_frequency(elems.ds_params[0]); 20098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg else 20198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = rx_status->freq; 20298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 20498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 20698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 20798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 20898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bss = ieee80211_bss_info_update(sdata->local, rx_status, 20998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt, skb->len, &elems, 2102a5193119269062608582418deba7af82844159aJohannes Berg channel, beacon); 211d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen if (bss) 212d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen ieee80211_rx_bss_put(sdata->local, bss); 21398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 21498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg dev_kfree_skb(skb); 21598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_QUEUED; 21698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg} 21798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 2184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg/* return false if no more work */ 2194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Bergstatic bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 2204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg{ 2214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 2224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg enum ieee80211_band band; 2234d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int i, ielen, n_chans; 2244d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2254d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg do { 2264d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 2274d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return false; 2284d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2294d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg band = local->hw_scan_band; 2304d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans = 0; 2314d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg for (i = 0; i < req->n_channels; i++) { 2324d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (req->channels[i]->band == band) { 2334d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->channels[n_chans] = 2344d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->channels[i]; 2354d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans++; 2364d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2374d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2384d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2394d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band++; 2404d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } while (!n_chans); 2414d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2424d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_channels = n_chans; 2434d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2444d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 245651b52254fc061f02d965524e71de4333a009a5aJouni Malinen req->ie, req->ie_len, band, (u32) -1, 246651b52254fc061f02d965524e71de4333a009a5aJouni Malinen 0); 2474d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie_len = ielen; 2484d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2494d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return true; 2504d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg} 2514d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 252e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszkastatic bool __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, 253e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka bool was_hw_scan) 2540a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2550a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 2560a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 257e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 2585bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 2596d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 2606d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 2616d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 2626d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 2636d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 2646d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 2656d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 2666d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 2675bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 268e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (WARN_ON(!local->scan_req)) 269e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka return false; 270de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 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); 274e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka return false; 2754d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2764d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2774d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 2784d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 279f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 2805ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 2812a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 2822a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 28315db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 2842a5193119269062608582418deba7af82844159aJohannes Berg 285fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 28658905ca5b11a0ff3860f55b789cbbf052f7158a7Johannes Berg local->scan_channel = NULL; 287f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 288e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka return true; 289e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka} 2900a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 291e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszkastatic void __ieee80211_scan_completed_finish(struct ieee80211_hw *hw, 292e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka bool was_hw_scan) 293e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka{ 294e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka struct ieee80211_local *local = hw_to_local(hw); 295a0daa0e7592ada797d6835f11529097aabc27ad2Luis R. Rodriguez 296e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 297e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (!was_hw_scan) { 298e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_configure_filter(local); 299e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka drv_sw_scan_complete(local); 300e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_offchannel_return(local, true); 301e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 3020a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3037da7cc1d42d8ce02cca16df8c021e6d657f1f8fdJohannes Berg mutex_lock(&local->mtx); 3045cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 3057da7cc1d42d8ce02cca16df8c021e6d657f1f8fdJohannes Berg mutex_unlock(&local->mtx); 306e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 3070a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 308469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 309472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 31081ac3462d346ee7aaf037a35156b0a7a354e98cfJohannes Berg ieee80211_queue_work(&local->hw, &local->work_work); 3110a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 3128789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3138789d459bc5e837bf37d261453df96ef54018d7bJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 3148789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg{ 3158789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg struct ieee80211_local *local = hw_to_local(hw); 3168789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3178789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg trace_api_scan_completed(local, aborted); 3188789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 3198789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_COMPLETED, &local->scanning); 3208789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg if (aborted) 3218789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg set_bit(SCAN_ABORTED, &local->scanning); 3228789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 3238789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg} 3240a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3250a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 326f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 327f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 328f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 329f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 330f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 331f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 332f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 333f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 334f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 335f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 336f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 337f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 338f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 339f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 340f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3412448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 342f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 343b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_stop_beaconing(local); 344f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 345df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time = 0; 346977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 347f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 348f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 349a80f7c0b088187c8471b441d461e937991870661Johannes Berg drv_flush(local, false); 350a80f7c0b088187c8471b441d461e937991870661Johannes Berg 3513ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 352f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 35342935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 35442935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez &local->scan_work, 35542935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez IEEE80211_CHANNEL_TIME); 356f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 357f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 358f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 359f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 360f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 361f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 362f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 363f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 364f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 365f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 366f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 367e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka lockdep_assert_held(&local->mtx); 368e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka 369f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 370f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 371f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3726e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville if (!list_empty(&local->work_list)) { 3736e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* wait for the work to finish/time out */ 374c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_req = req; 375c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg local->scan_sdata = sdata; 376c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg return 0; 377c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg } 378c0ce77b8323c1a0d4eeef97caf16c0ea971222a9Johannes Berg 379f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 380f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 381f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3824d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 3834d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 3844d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 3854d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 3864d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie_len, GFP_KERNEL); 3874d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 388f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 389f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3904d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ssids = req->ssids; 3914d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 3924d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 3934d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 3944d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 3954d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie = ies; 3964d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 3974d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 3986e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 3996e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville /* 4006e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * After allocating local->hw_scan_req, we must 4016e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * go through until ieee80211_prep_hw_scan(), so 4026e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * anything that might be changed here and leave 4036e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * this function early must not go after this 4046e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville * allocation. 4056e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville */ 406f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 407f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 408f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 409f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = sdata; 410f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 411f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) 412fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 413f3b85252f081581a8f257545ed748062dce7798bJohannes Berg else 414fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 4156e7e6213e4956828927c30e3ef5a42812d00c650John W. Linville 4165cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 417f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 4194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 420a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg rc = drv_hw_scan(local, sdata, local->hw_scan_req); 4214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 422f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 423f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 424f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 4254d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 4264d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 427fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 428f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4295cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 4305cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 431f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 432f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = NULL; 433f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 434f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 435f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 436f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 437f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 438df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaastatic unsigned long 439df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaaieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 440df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa{ 441df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 442df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * TODO: channel switching also consumes quite some time, 443df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * add that delay as well to get a better estimation 444df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 445df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) 446df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PASSIVE_CHANNEL_TIME; 447df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 448df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa} 449df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 450e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszkastatic void ieee80211_scan_state_decision(struct ieee80211_local *local, 451e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka unsigned long *next_delay) 4527d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 453142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 454df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool tx_empty = true; 455df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool bad_latency; 456df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bool listen_int_exceeded; 457df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa unsigned long min_beacon_int = 0; 458142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 459df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa struct ieee80211_channel *next_chan; 460142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 461df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* 462df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface is associated, 463df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * check if at least one STA interface has pending tx frames 464df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * and grab the lowest used beacon interval 465df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa */ 466142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 467142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 4689607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 469142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 470142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 471142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 472142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 473142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 474df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 475df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (sdata->vif.bss_conf.beacon_int < 476df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa min_beacon_int || min_beacon_int == 0) 477df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa min_beacon_int = 478df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa sdata->vif.bss_conf.beacon_int; 479df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 480df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (!qdisc_all_tx_empty(sdata->dev)) { 481df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa tx_empty = false; 482df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa break; 483df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa } 484142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 485142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 486142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 487142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 488142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 489142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (local->scan_channel) { 490142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 491142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're currently scanning a different channel, let's 492df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * see if we can scan another channel without interfering 493df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * with the current traffic situation. 494df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * 495df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * Since we don't know if the AP has pending frames for us 496df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * we can only check for our tx queues and use the current 497df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * pm_qos requirements for rx. Hence, if no tx traffic occurs 498df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * at all we will scan as many channels in a row as the pm_qos 499df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * latency allows us to. Additionally we also check for the 500df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * currently negotiated listen interval to prevent losing 501df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * frames unnecessarily. 502df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * 503df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa * Otherwise switch back to the operating channel. 504142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 505df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa next_chan = local->scan_req->channels[local->scan_channel_idx]; 506df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 507df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa bad_latency = time_after(jiffies + 508df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa ieee80211_scan_get_channel_time(next_chan), 509df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time + 510f8965467f366fd18f01feafb5db10512d7b4422cLinus Torvalds usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); 511df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 512df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa listen_int_exceeded = time_after(jiffies + 513df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa ieee80211_scan_get_channel_time(next_chan), 514df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time + 515df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa usecs_to_jiffies(min_beacon_int * 1024) * 516df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->hw.conf.listen_interval); 517df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 518df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa if (associated && ( !tx_empty || bad_latency || 519df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa listen_int_exceeded)) 520977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; 521142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa else 522977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 523142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } else { 524142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 525142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're on the operating channel currently, let's 526142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * leave that channel now to scan another one 527142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 528977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; 529142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 530142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 5312fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa *next_delay = 0; 5322fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa} 5332fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 534142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, 535142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 536142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 537b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_stop_station(local); 538142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 539142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __set_bit(SCAN_OFF_CHANNEL, &local->scanning); 540142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 541a80f7c0b088187c8471b441d461e937991870661Johannes Berg /* 542a80f7c0b088187c8471b441d461e937991870661Johannes Berg * What if the nullfunc frames didn't arrive? 543a80f7c0b088187c8471b441d461e937991870661Johannes Berg */ 544a80f7c0b088187c8471b441d461e937991870661Johannes Berg drv_flush(local, false); 545a80f7c0b088187c8471b441d461e937991870661Johannes Berg if (local->ops->flush) 546a80f7c0b088187c8471b441d461e937991870661Johannes Berg *next_delay = 0; 547a80f7c0b088187c8471b441d461e937991870661Johannes Berg else 548a80f7c0b088187c8471b441d461e937991870661Johannes Berg *next_delay = HZ / 10; 549a80f7c0b088187c8471b441d461e937991870661Johannes Berg 550df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa /* remember when we left the operating channel */ 551df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa local->leave_oper_channel_time = jiffies; 552df13cce53a7b28a81460e6bfc4857e9df4956141Helmut Schaa 553142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* advance to the next channel to be scanned */ 554977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 555142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 556142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 557142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, 558142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 559142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 560142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* switch back to the operating channel */ 561142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa local->scan_channel = NULL; 562142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 563142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 564142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 565b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen * Only re-enable station mode interface now; beaconing will be 566b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen * re-enabled once the full scan has been completed. 567142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 568b203ffc3a447eb8d9e6120b783ddee081b143061Jouni Malinen ieee80211_offchannel_return(local, false); 569142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 570142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); 571142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 572142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa *next_delay = HZ / 5; 573977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 574142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 575142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 5762fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 5772fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 5782fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 5792fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 5802fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 5812fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 5827d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 5837d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 5847d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 585584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg local->scan_channel = chan; 586584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 5877d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 1; 5887d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 5897d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 5907d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 5917d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 5920ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 5930ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 5940ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 5952fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 5960ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 5977d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 5987d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 5997d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6007d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6017d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 6027d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 6037d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 6047d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 6057d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 6067d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 6077d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6087d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6097d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 6107d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 611977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6122fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6137d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6147d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6152fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 6167d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 617977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6187d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6197d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6207d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaastatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 6217d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa unsigned long *next_delay) 6227d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 6237d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa int i; 6247d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6257d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6267d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa for (i = 0; i < local->scan_req->n_ssids; i++) 6277d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_send_probe_req( 6287d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa sdata, NULL, 6297d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid, 6307d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid_len, 6317d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ie, local->scan_req->ie_len); 6327d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6337d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6347d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * After sending probe requests, wait for probe responses 6357d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * on the channel. 6367d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6377d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_CHANNEL_TIME; 638977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6397d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6407d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 641c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 6420a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 6430a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 6440a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 6450a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6460a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 647e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka bool aborted, hw_scan, finish; 6480a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 649259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_lock(&local->mtx); 6508789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 651259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 6528789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 653259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 6548789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg } 6558789d459bc5e837bf37d261453df96ef54018d7bJohannes Berg 656259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (!sdata || !local->scan_req) 657259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 658f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 6594d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_req) { 660a060bbfe4ee95d115e8f9705a66894ac34e2c475Johannes Berg int rc = drv_hw_scan(local, sdata, local->hw_scan_req); 661259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (rc) { 662259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 663259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 664259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka } else 665259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 6664d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 6674d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 668fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 669f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 670f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 671f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 672f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 67315db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 674f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 675f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 676259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka if (rc) { 677259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 678259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 679259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka } else 680259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out; 681f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 682f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 6835bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 6845bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg * Avoid re-scheduling when the sdata is going away. 6855bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg */ 6869607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) { 687259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka aborted = true; 688259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka goto out_complete; 689f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 6900a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 691259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_unlock(&local->mtx); 692259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka 693f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa /* 694f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 695f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 696f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 697f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 698977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 6992fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 700e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka /* if no more bands/channels left, complete scan */ 701e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (local->scan_channel_idx >= local->scan_req->n_channels) { 702e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka aborted = false; 703e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka goto out_complete; 704e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka } 705e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka ieee80211_scan_state_decision(local, &next_delay); 706f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 7072fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 7082fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7092fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 710f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 711f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 712f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 713142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_LEAVE_OPER_CHANNEL: 714142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_leave_oper_channel(local, &next_delay); 715142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 716142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_ENTER_OPER_CHANNEL: 717142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_enter_oper_channel(local, &next_delay); 718142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 719f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 720f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 7210a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 72242935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 723259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka return; 724259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka 725259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout_complete: 726e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 727e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka finish = __ieee80211_scan_completed(&local->hw, aborted, hw_scan); 728259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_unlock(&local->mtx); 729e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (finish) 730e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka __ieee80211_scan_completed_finish(&local->hw, hw_scan); 731259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka return; 732259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka 733259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszkaout: 734259b62e35bf44a97983f275de569929a7d2bd5ddStanislaw Gruszka mutex_unlock(&local->mtx); 7350a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7360a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 737f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 738f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 7390a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 740f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 741de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 742a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&sdata->local->mtx); 743f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 744a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&sdata->local->mtx); 7450a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 746f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 7470a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7480a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 749f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 750be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg const u8 *ssid, u8 ssid_len, 751be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg struct ieee80211_channel *chan) 7520a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7530a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 754f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 755fb63bc41772259701a827e9a6117219a7393554fGertjan van Wingerde enum ieee80211_band band; 7562a5193119269062608582418deba7af82844159aJohannes Berg 757a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 7580a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 759f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 760f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 761f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 7629116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 763be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg /* fill internal scan request */ 764be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!chan) { 765be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg int i, nchan = 0; 766be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 767be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 768be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg if (!local->hw.wiphy->bands[band]) 769be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg continue; 770be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg for (i = 0; 771be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg i < local->hw.wiphy->bands[band]->n_channels; 772be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg i++) { 773be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[nchan] = 774be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg &local->hw.wiphy->bands[band]->channels[i]; 775be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg nchan++; 776be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 777be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 778be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 779be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = nchan; 780be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } else { 781be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->channels[0] = chan; 782be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_channels = 1; 783be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg } 784be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg 785be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->ssids = &local->scan_ssid; 786be4a4b6a5d2f76393f545a2545fbaa1b65577e13Johannes Berg local->int_scan_req->n_ssids = 1; 7875ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 7885ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 7899116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 7905ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 791f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 792a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&local->mtx); 793f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 7940a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7955bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7964136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka/* 7974136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Only call this function when a scan can't be queued -- under RTNL. 7984136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka */ 7995bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 8005bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 8014136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka bool abortscan, finish; 8025bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8035bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 8044136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * We are only canceling software scan, or deferred scan that was not 8054136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * yet really started (see __ieee80211_start_scan ). 8064136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8074136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Regarding hardware scan: 8084136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not call __ieee80211_scan_completed() as when 8094136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * SCAN_HW_SCANNING bit is set this function change 8104136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * local->hw_scan_req to operate on 5G band, what race with 8114136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * driver which can use local->hw_scan_req 8124136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8134136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * - we can not cancel scan_work since driver can schedule it 8144136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * by ieee80211_scan_completed(..., true) to finish scan 8154136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * 8164136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka * Hence low lever driver is responsible for canceling HW scan. 8175bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 8184136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka 819a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_lock(&local->mtx); 8204136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka abortscan = local->scan_req && !test_bit(SCAN_HW_SCANNING, &local->scanning); 821e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka if (abortscan) 822e229f844d7223b7063bea1e649203ac521a58fe1Stanislaw Gruszka finish = __ieee80211_scan_completed(&local->hw, true, false); 823a1699b75a1db31a1da2f0fc610ee696d02a19280Johannes Berg mutex_unlock(&local->mtx); 8245bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8254136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka if (abortscan) { 8264136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka /* The scan is canceled, but stop work from being pending */ 8274136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka cancel_delayed_work_sync(&local->scan_work); 8284136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka if (finish) 8294136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka __ieee80211_scan_completed_finish(&local->hw, false); 8304136c4224ccf1907d309e1cdfaefef9da97dbc5eStanislaw Gruszka } 8315bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 832