Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 2 | /* |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 3 | * Scanning implementation |
| 4 | * |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 5 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| 6 | * Copyright 2004, Instant802 Networks, Inc. |
| 7 | * Copyright 2005, Devicescape Software, Inc. |
| 8 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 9 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
Sara Sharon | 74d803b | 2015-06-03 10:44:17 +0300 | [diff] [blame] | 10 | * Copyright 2013-2015 Intel Mobile Communications GmbH |
Roee Zamir | 40b0bd2 | 2017-08-06 11:38:23 +0300 | [diff] [blame] | 11 | * Copyright 2016-2017 Intel Deutschland GmbH |
Johannes Berg | 5d24828 | 2021-09-20 15:40:10 +0200 | [diff] [blame] | 12 | * Copyright (C) 2018-2021 Intel Corporation |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 13 | */ |
| 14 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 15 | #include <linux/if_arp.h> |
Felix Fietkau | 888d04d | 2012-03-01 15:22:09 +0100 | [diff] [blame] | 16 | #include <linux/etherdevice.h> |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 17 | #include <linux/rtnetlink.h> |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 18 | #include <net/sch_generic.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 20 | #include <linux/export.h> |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 21 | #include <linux/random.h> |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 22 | #include <net/mac80211.h> |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 23 | |
| 24 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 25 | #include "driver-ops.h" |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 26 | #include "mesh.h" |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 27 | |
| 28 | #define IEEE80211_PROBE_DELAY (HZ / 33) |
| 29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) |
Stanislaw Gruszka | 3f892b6 | 2013-01-23 12:32:45 +0100 | [diff] [blame] | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 31 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 33 | struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 34 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 35 | if (!bss) |
| 36 | return; |
Johannes Berg | 5b112d3 | 2013-02-01 01:49:58 +0100 | [diff] [blame] | 37 | cfg80211_put_bss(local->hw.wiphy, |
| 38 | container_of((void *)bss, struct cfg80211_bss, priv)); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 39 | } |
| 40 | |
Kalle Valo | ab13315 | 2010-01-12 10:42:31 +0200 | [diff] [blame] | 41 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
| 42 | { |
| 43 | u8 qos_info; |
| 44 | |
| 45 | if (elems->wmm_info && elems->wmm_info_len == 7 |
| 46 | && elems->wmm_info[5] == 1) |
| 47 | qos_info = elems->wmm_info[6]; |
| 48 | else if (elems->wmm_param && elems->wmm_param_len == 24 |
| 49 | && elems->wmm_param[5] == 1) |
| 50 | qos_info = elems->wmm_param[6]; |
| 51 | else |
| 52 | /* no valid wmm information or parameter element found */ |
| 53 | return false; |
| 54 | |
| 55 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; |
| 56 | } |
| 57 | |
Sara Sharon | fcea7db | 2019-01-16 20:35:38 +0200 | [diff] [blame] | 58 | static void |
| 59 | ieee80211_update_bss_from_elems(struct ieee80211_local *local, |
| 60 | struct ieee80211_bss *bss, |
| 61 | struct ieee802_11_elems *elems, |
| 62 | struct ieee80211_rx_status *rx_status, |
| 63 | bool beacon) |
| 64 | { |
| 65 | int clen, srlen; |
| 66 | |
| 67 | if (beacon) |
| 68 | bss->device_ts_beacon = rx_status->device_timestamp; |
| 69 | else |
| 70 | bss->device_ts_presp = rx_status->device_timestamp; |
| 71 | |
| 72 | if (elems->parse_error) { |
| 73 | if (beacon) |
| 74 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; |
| 75 | else |
| 76 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; |
| 77 | } else { |
| 78 | if (beacon) |
| 79 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; |
| 80 | else |
| 81 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; |
| 82 | } |
| 83 | |
| 84 | /* save the ERP value so that it is available at association time */ |
| 85 | if (elems->erp_info && (!elems->parse_error || |
| 86 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { |
| 87 | bss->erp_value = elems->erp_info[0]; |
| 88 | bss->has_erp_value = true; |
| 89 | if (!elems->parse_error) |
| 90 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; |
| 91 | } |
| 92 | |
| 93 | /* replace old supported rates if we get new values */ |
| 94 | if (!elems->parse_error || |
| 95 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { |
| 96 | srlen = 0; |
| 97 | if (elems->supp_rates) { |
| 98 | clen = IEEE80211_MAX_SUPP_RATES; |
| 99 | if (clen > elems->supp_rates_len) |
| 100 | clen = elems->supp_rates_len; |
| 101 | memcpy(bss->supp_rates, elems->supp_rates, clen); |
| 102 | srlen += clen; |
| 103 | } |
| 104 | if (elems->ext_supp_rates) { |
| 105 | clen = IEEE80211_MAX_SUPP_RATES - srlen; |
| 106 | if (clen > elems->ext_supp_rates_len) |
| 107 | clen = elems->ext_supp_rates_len; |
| 108 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, |
| 109 | clen); |
| 110 | srlen += clen; |
| 111 | } |
| 112 | if (srlen) { |
| 113 | bss->supp_rates_len = srlen; |
| 114 | if (!elems->parse_error) |
| 115 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | if (!elems->parse_error || |
| 120 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { |
| 121 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
| 122 | bss->uapsd_supported = is_uapsd_supported(elems); |
| 123 | if (!elems->parse_error) |
| 124 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; |
| 125 | } |
| 126 | |
| 127 | if (beacon) { |
| 128 | struct ieee80211_supported_band *sband = |
| 129 | local->hw.wiphy->bands[rx_status->band]; |
| 130 | if (!(rx_status->encoding == RX_ENC_HT) && |
| 131 | !(rx_status->encoding == RX_ENC_VHT)) |
| 132 | bss->beacon_rate = |
| 133 | &sband->bitrates[rx_status->rate_idx]; |
| 134 | } |
Johannes Berg | 2a333a0 | 2020-05-28 21:34:35 +0200 | [diff] [blame] | 135 | |
| 136 | if (elems->vht_cap_elem) |
| 137 | bss->vht_cap_info = |
| 138 | le32_to_cpu(elems->vht_cap_elem->vht_cap_info); |
| 139 | else |
| 140 | bss->vht_cap_info = 0; |
Sara Sharon | fcea7db | 2019-01-16 20:35:38 +0200 | [diff] [blame] | 141 | } |
| 142 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 143 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 144 | ieee80211_bss_info_update(struct ieee80211_local *local, |
| 145 | struct ieee80211_rx_status *rx_status, |
Emmanuel Grumbach | d45c417 | 2012-12-10 16:19:13 +0200 | [diff] [blame] | 146 | struct ieee80211_mgmt *mgmt, size_t len, |
Emmanuel Grumbach | d45c417 | 2012-12-10 16:19:13 +0200 | [diff] [blame] | 147 | struct ieee80211_channel *channel) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 148 | { |
Thomas Pedersen | cd418ba | 2020-09-21 19:28:08 -0700 | [diff] [blame] | 149 | bool beacon = ieee80211_is_beacon(mgmt->frame_control) || |
| 150 | ieee80211_is_s1g_beacon(mgmt->frame_control); |
Sara Sharon | 78ac51f | 2019-01-16 18:22:56 +0200 | [diff] [blame] | 151 | struct cfg80211_bss *cbss, *non_tx_cbss; |
| 152 | struct ieee80211_bss *bss, *non_tx_bss; |
Johannes Berg | 162dd6a | 2016-02-23 23:05:06 +0200 | [diff] [blame] | 153 | struct cfg80211_inform_bss bss_meta = { |
| 154 | .boottime_ns = rx_status->boottime_ns, |
| 155 | }; |
Sara Sharon | 74d803b | 2015-06-03 10:44:17 +0300 | [diff] [blame] | 156 | bool signal_valid; |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 157 | struct ieee80211_sub_if_data *scan_sdata; |
Johannes Berg | 5d24828 | 2021-09-20 15:40:10 +0200 | [diff] [blame] | 158 | struct ieee802_11_elems *elems; |
Sara Sharon | 4abb52a | 2019-01-16 12:14:41 +0200 | [diff] [blame] | 159 | size_t baselen; |
| 160 | u8 *elements; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 161 | |
Tosoni | 1ad22fb | 2018-03-14 16:58:34 +0000 | [diff] [blame] | 162 | if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) |
| 163 | bss_meta.signal = 0; /* invalid signal indication */ |
| 164 | else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 165 | bss_meta.signal = rx_status->signal * 100; |
Johannes Berg | 30686bf | 2015-06-02 21:39:54 +0200 | [diff] [blame] | 166 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 167 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 168 | |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 169 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
Johannes Berg | da6a435 | 2017-04-26 12:14:59 +0200 | [diff] [blame] | 170 | if (rx_status->bw == RATE_INFO_BW_5) |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 171 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
Johannes Berg | da6a435 | 2017-04-26 12:14:59 +0200 | [diff] [blame] | 172 | else if (rx_status->bw == RATE_INFO_BW_10) |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 173 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 174 | |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 175 | bss_meta.chan = channel; |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 176 | |
| 177 | rcu_read_lock(); |
| 178 | scan_sdata = rcu_dereference(local->scan_sdata); |
| 179 | if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && |
| 180 | scan_sdata->vif.bss_conf.assoc && |
| 181 | ieee80211_have_rx_timestamp(rx_status)) { |
| 182 | bss_meta.parent_tsf = |
| 183 | ieee80211_calculate_rx_timestamp(local, rx_status, |
| 184 | len + FCS_LEN, 24); |
| 185 | ether_addr_copy(bss_meta.parent_bssid, |
| 186 | scan_sdata->vif.bss_conf.bssid); |
| 187 | } |
| 188 | rcu_read_unlock(); |
| 189 | |
Johannes Berg | 61f6bba | 2015-10-13 11:36:21 +0200 | [diff] [blame] | 190 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, |
| 191 | mgmt, len, GFP_ATOMIC); |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 192 | if (!cbss) |
Johannes Berg | 00d3f14 | 2009-02-10 21:26:00 +0100 | [diff] [blame] | 193 | return NULL; |
Sara Sharon | 4abb52a | 2019-01-16 12:14:41 +0200 | [diff] [blame] | 194 | |
| 195 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
| 196 | elements = mgmt->u.probe_resp.variable; |
| 197 | baselen = offsetof(struct ieee80211_mgmt, |
| 198 | u.probe_resp.variable); |
Thomas Pedersen | cd418ba | 2020-09-21 19:28:08 -0700 | [diff] [blame] | 199 | } else if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
| 200 | struct ieee80211_ext *ext = (void *) mgmt; |
| 201 | |
| 202 | baselen = offsetof(struct ieee80211_ext, u.s1g_beacon.variable); |
| 203 | elements = ext->u.s1g_beacon.variable; |
Sara Sharon | 4abb52a | 2019-01-16 12:14:41 +0200 | [diff] [blame] | 204 | } else { |
| 205 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
| 206 | elements = mgmt->u.beacon.variable; |
| 207 | } |
| 208 | |
| 209 | if (baselen > len) |
| 210 | return NULL; |
| 211 | |
Johannes Berg | 5d24828 | 2021-09-20 15:40:10 +0200 | [diff] [blame] | 212 | elems = ieee802_11_parse_elems(elements, len - baselen, false, |
| 213 | mgmt->bssid, cbss->bssid); |
| 214 | if (!elems) |
| 215 | return NULL; |
Sara Sharon | 4abb52a | 2019-01-16 12:14:41 +0200 | [diff] [blame] | 216 | |
Sara Sharon | 74d803b | 2015-06-03 10:44:17 +0300 | [diff] [blame] | 217 | /* In case the signal is invalid update the status */ |
Emmanuel Grumbach | 7bb106e | 2020-02-14 23:23:38 +0100 | [diff] [blame] | 218 | signal_valid = channel == cbss->channel; |
Sara Sharon | 74d803b | 2015-06-03 10:44:17 +0300 | [diff] [blame] | 219 | if (!signal_valid) |
| 220 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; |
Johannes Berg | 00d3f14 | 2009-02-10 21:26:00 +0100 | [diff] [blame] | 221 | |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 222 | bss = (void *)cbss->priv; |
Johannes Berg | 5d24828 | 2021-09-20 15:40:10 +0200 | [diff] [blame] | 223 | ieee80211_update_bss_from_elems(local, bss, elems, rx_status, beacon); |
Alexander Bondar | 817cee7 | 2013-05-19 14:23:57 +0300 | [diff] [blame] | 224 | |
Sara Sharon | 78ac51f | 2019-01-16 18:22:56 +0200 | [diff] [blame] | 225 | list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) { |
| 226 | non_tx_bss = (void *)non_tx_cbss->priv; |
| 227 | |
Johannes Berg | 5d24828 | 2021-09-20 15:40:10 +0200 | [diff] [blame] | 228 | ieee80211_update_bss_from_elems(local, non_tx_bss, elems, |
Sara Sharon | 78ac51f | 2019-01-16 18:22:56 +0200 | [diff] [blame] | 229 | rx_status, beacon); |
| 230 | } |
| 231 | |
Johannes Berg | 5d24828 | 2021-09-20 15:40:10 +0200 | [diff] [blame] | 232 | kfree(elems); |
| 233 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 234 | return bss; |
| 235 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 236 | |
Roee Zamir | 40b0bd2 | 2017-08-06 11:38:23 +0300 | [diff] [blame] | 237 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
| 238 | u32 scan_flags, const u8 *da) |
| 239 | { |
| 240 | if (!sdata) |
| 241 | return false; |
| 242 | /* accept broadcast for OCE */ |
| 243 | if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && |
| 244 | is_broadcast_ether_addr(da)) |
| 245 | return true; |
| 246 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
| 247 | return true; |
| 248 | return ether_addr_equal(da, sdata->vif.addr); |
| 249 | } |
| 250 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 251 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 252 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 253 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 254 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
| 255 | struct ieee80211_mgmt *mgmt = (void *)skb->data; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 256 | struct ieee80211_bss *bss; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 257 | struct ieee80211_channel *channel; |
Du Cheng | e298aa3 | 2021-05-10 12:16:49 +0800 | [diff] [blame] | 258 | size_t min_hdr_len = offsetof(struct ieee80211_mgmt, |
| 259 | u.probe_resp.variable); |
| 260 | |
| 261 | if (!ieee80211_is_probe_resp(mgmt->frame_control) && |
| 262 | !ieee80211_is_beacon(mgmt->frame_control) && |
| 263 | !ieee80211_is_s1g_beacon(mgmt->frame_control)) |
| 264 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 265 | |
Thomas Pedersen | cd418ba | 2020-09-21 19:28:08 -0700 | [diff] [blame] | 266 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
Du Cheng | e298aa3 | 2021-05-10 12:16:49 +0800 | [diff] [blame] | 267 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) |
| 268 | min_hdr_len = offsetof(struct ieee80211_ext, |
| 269 | u.s1g_short_beacon.variable); |
| 270 | else |
| 271 | min_hdr_len = offsetof(struct ieee80211_ext, |
| 272 | u.s1g_beacon); |
| 273 | } |
| 274 | |
| 275 | if (skb->len < min_hdr_len) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 276 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 277 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 278 | sdata1 = rcu_dereference(local->scan_sdata); |
| 279 | sdata2 = rcu_dereference(local->sched_scan_sdata); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 280 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 281 | if (likely(!sdata1 && !sdata2)) |
| 282 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 283 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 284 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 285 | struct cfg80211_scan_request *scan_req; |
| 286 | struct cfg80211_sched_scan_request *sched_scan_req; |
Roee Zamir | 40b0bd2 | 2017-08-06 11:38:23 +0300 | [diff] [blame] | 287 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 288 | |
| 289 | scan_req = rcu_dereference(local->scan_req); |
| 290 | sched_scan_req = rcu_dereference(local->sched_scan_req); |
| 291 | |
Roee Zamir | 40b0bd2 | 2017-08-06 11:38:23 +0300 | [diff] [blame] | 292 | if (scan_req) |
| 293 | scan_req_flags = scan_req->flags; |
| 294 | |
| 295 | if (sched_scan_req) |
| 296 | sched_scan_req_flags = sched_scan_req->flags; |
| 297 | |
| 298 | /* ignore ProbeResp to foreign address or non-bcast (OCE) |
| 299 | * unless scanning with randomised address |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 300 | */ |
Roee Zamir | 40b0bd2 | 2017-08-06 11:38:23 +0300 | [diff] [blame] | 301 | if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, |
| 302 | mgmt->da) && |
| 303 | !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, |
| 304 | mgmt->da)) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 305 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 306 | } |
| 307 | |
Thomas Pedersen | 3b23c184 | 2020-04-01 18:18:05 -0700 | [diff] [blame] | 308 | channel = ieee80211_get_channel_khz(local->hw.wiphy, |
| 309 | ieee80211_rx_status_to_khz(rx_status)); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 310 | |
| 311 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 312 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 313 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 314 | bss = ieee80211_bss_info_update(local, rx_status, |
Sara Sharon | 4abb52a | 2019-01-16 12:14:41 +0200 | [diff] [blame] | 315 | mgmt, skb->len, |
Emmanuel Grumbach | d45c417 | 2012-12-10 16:19:13 +0200 | [diff] [blame] | 316 | channel); |
Jouni Malinen | d048e50 | 2008-10-11 03:29:55 +0300 | [diff] [blame] | 317 | if (bss) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 318 | ieee80211_rx_bss_put(local, bss); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 319 | } |
| 320 | |
Simon Wunderlich | 2103dec | 2013-07-08 16:55:53 +0200 | [diff] [blame] | 321 | static void |
| 322 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, |
| 323 | enum nl80211_bss_scan_width scan_width) |
| 324 | { |
| 325 | memset(chandef, 0, sizeof(*chandef)); |
| 326 | switch (scan_width) { |
| 327 | case NL80211_BSS_CHAN_WIDTH_5: |
| 328 | chandef->width = NL80211_CHAN_WIDTH_5; |
| 329 | break; |
| 330 | case NL80211_BSS_CHAN_WIDTH_10: |
| 331 | chandef->width = NL80211_CHAN_WIDTH_10; |
| 332 | break; |
| 333 | default: |
| 334 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; |
| 335 | break; |
| 336 | } |
| 337 | } |
| 338 | |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 339 | /* return false if no more work */ |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 340 | static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 341 | { |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 342 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 343 | struct cfg80211_scan_request *req; |
Simon Wunderlich | 2103dec | 2013-07-08 16:55:53 +0200 | [diff] [blame] | 344 | struct cfg80211_chan_def chandef; |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 345 | u8 bands_used = 0; |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 346 | int i, ielen, n_chans; |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 347 | u32 flags = 0; |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 348 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 349 | req = rcu_dereference_protected(local->scan_req, |
| 350 | lockdep_is_held(&local->mtx)); |
| 351 | |
Emmanuel Grumbach | a754055 | 2013-09-16 11:12:07 +0300 | [diff] [blame] | 352 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
| 353 | return false; |
| 354 | |
Johannes Berg | 30686bf | 2015-06-02 21:39:54 +0200 | [diff] [blame] | 355 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 356 | for (i = 0; i < req->n_channels; i++) { |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 357 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
| 358 | bands_used |= BIT(req->channels[i]->band); |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 359 | } |
| 360 | |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 361 | n_chans = req->n_channels; |
| 362 | } else { |
| 363 | do { |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 364 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 365 | return false; |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 366 | |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 367 | n_chans = 0; |
| 368 | |
| 369 | for (i = 0; i < req->n_channels; i++) { |
| 370 | if (req->channels[i]->band != |
| 371 | local->hw_scan_band) |
| 372 | continue; |
| 373 | local->hw_scan_req->req.channels[n_chans] = |
| 374 | req->channels[i]; |
| 375 | n_chans++; |
| 376 | bands_used |= BIT(req->channels[i]->band); |
| 377 | } |
| 378 | |
| 379 | local->hw_scan_band++; |
| 380 | } while (!n_chans); |
| 381 | } |
| 382 | |
| 383 | local->hw_scan_req->req.n_channels = n_chans; |
Simon Wunderlich | 2103dec | 2013-07-08 16:55:53 +0200 | [diff] [blame] | 384 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 385 | |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 386 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
| 387 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
| 388 | |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 389 | ielen = ieee80211_build_preq_ies(sdata, |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 390 | (u8 *)local->hw_scan_req->req.ie, |
Johannes Berg | c604b9f | 2012-11-29 12:45:18 +0100 | [diff] [blame] | 391 | local->hw_scan_ies_bufsize, |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 392 | &local->hw_scan_req->ies, |
| 393 | req->ie, req->ie_len, |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 394 | bands_used, req->rates, &chandef, |
| 395 | flags); |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 396 | local->hw_scan_req->req.ie_len = ielen; |
| 397 | local->hw_scan_req->req.no_cck = req->no_cck; |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 398 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
| 399 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, |
| 400 | req->mac_addr_mask); |
Jouni Malinen | e345f44 | 2016-02-26 22:12:48 +0200 | [diff] [blame] | 401 | ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 402 | |
| 403 | return true; |
| 404 | } |
| 405 | |
Eliad Peller | 8bd2a24 | 2013-12-05 11:21:27 +0200 | [diff] [blame] | 406 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 407 | { |
| 408 | struct ieee80211_local *local = hw_to_local(hw); |
Johannes Berg | e9da68d | 2018-10-18 10:35:47 +0200 | [diff] [blame] | 409 | bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
Eliad Peller | a2b70e8 | 2013-12-05 11:21:28 +0200 | [diff] [blame] | 410 | bool was_scanning = local->scanning; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 411 | struct cfg80211_scan_request *scan_req; |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 412 | struct ieee80211_sub_if_data *scan_sdata; |
Sachin Kulkarni | 4fa11ec | 2016-01-12 14:30:19 +0530 | [diff] [blame] | 413 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 414 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 415 | lockdep_assert_held(&local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 416 | |
Johannes Berg | 6d3560d | 2009-10-31 07:44:08 +0100 | [diff] [blame] | 417 | /* |
| 418 | * It's ok to abort a not-yet-running scan (that |
| 419 | * we have one at all will be verified by checking |
| 420 | * local->scan_req next), but not to complete it |
| 421 | * successfully. |
| 422 | */ |
| 423 | if (WARN_ON(!local->scanning && !aborted)) |
| 424 | aborted = true; |
Johannes Berg | de95a54b | 2009-04-01 11:58:36 +0200 | [diff] [blame] | 425 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 426 | if (WARN_ON(!local->scan_req)) |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 427 | return; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 428 | |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 429 | scan_sdata = rcu_dereference_protected(local->scan_sdata, |
| 430 | lockdep_is_held(&local->mtx)); |
| 431 | |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 432 | if (hw_scan && !aborted && |
Johannes Berg | 30686bf | 2015-06-02 21:39:54 +0200 | [diff] [blame] | 433 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 434 | ieee80211_prep_hw_scan(scan_sdata)) { |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 435 | int rc; |
| 436 | |
| 437 | rc = drv_hw_scan(local, |
| 438 | rcu_dereference_protected(local->scan_sdata, |
| 439 | lockdep_is_held(&local->mtx)), |
| 440 | local->hw_scan_req); |
| 441 | |
Stanislaw Gruszka | 6eb11a9 | 2010-10-06 11:22:11 +0200 | [diff] [blame] | 442 | if (rc == 0) |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 443 | return; |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 444 | |
Johannes Berg | 7d10f6b | 2016-07-05 15:23:13 +0300 | [diff] [blame] | 445 | /* HW scan failed and is going to be reported as aborted, |
| 446 | * so clear old scan info. |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 447 | */ |
| 448 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
Johannes Berg | 7d10f6b | 2016-07-05 15:23:13 +0300 | [diff] [blame] | 449 | aborted = true; |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | kfree(local->hw_scan_req); |
| 453 | local->hw_scan_req = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 454 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 455 | scan_req = rcu_dereference_protected(local->scan_req, |
| 456 | lockdep_is_held(&local->mtx)); |
| 457 | |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 458 | if (scan_req != local->int_scan_req) { |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 459 | local->scan_info.aborted = aborted; |
| 460 | cfg80211_scan_done(scan_req, &local->scan_info); |
Avraham Stern | 1d76250 | 2016-07-05 17:10:13 +0300 | [diff] [blame] | 461 | } |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 462 | RCU_INIT_POINTER(local->scan_req, NULL); |
Monam Agarwal | 0c2bef46 | 2014-03-24 00:51:43 +0530 | [diff] [blame] | 463 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 464 | |
Helmut Schaa | fbe9c429 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 465 | local->scanning = 0; |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 466 | local->scan_chandef.chan = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 467 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 468 | /* Set power back to normal operating levels. */ |
| 469 | ieee80211_hw_config(local, 0); |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 470 | |
Eliad Peller | 8bd2a24 | 2013-12-05 11:21:27 +0200 | [diff] [blame] | 471 | if (!hw_scan) { |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 472 | ieee80211_configure_filter(local); |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 473 | drv_sw_scan_complete(local, scan_sdata); |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 474 | ieee80211_offchannel_return(local); |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 475 | } |
| 476 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 477 | ieee80211_recalc_idle(local); |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 478 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 479 | ieee80211_mlme_notify_scan_completed(local); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 480 | ieee80211_ibss_notify_scan_completed(local); |
Sachin Kulkarni | 4fa11ec | 2016-01-12 14:30:19 +0530 | [diff] [blame] | 481 | |
| 482 | /* Requeue all the work that might have been ignored while |
| 483 | * the scan was in progress; if there was none this will |
| 484 | * just be a no-op for the particular interface. |
| 485 | */ |
| 486 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| 487 | if (ieee80211_sdata_running(sdata)) |
| 488 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
| 489 | } |
| 490 | |
Eliad Peller | a2b70e8 | 2013-12-05 11:21:28 +0200 | [diff] [blame] | 491 | if (was_scanning) |
| 492 | ieee80211_start_next_roc(local); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 493 | } |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 494 | |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 495 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
| 496 | struct cfg80211_scan_info *info) |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 497 | { |
| 498 | struct ieee80211_local *local = hw_to_local(hw); |
| 499 | |
Johannes Berg | 58bd7f1 | 2016-09-14 09:37:54 +0200 | [diff] [blame] | 500 | trace_api_scan_completed(local, info->aborted); |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 501 | |
| 502 | set_bit(SCAN_COMPLETED, &local->scanning); |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 503 | if (info->aborted) |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 504 | set_bit(SCAN_ABORTED, &local->scanning); |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 505 | |
| 506 | memcpy(&local->scan_info, info, sizeof(*info)); |
| 507 | |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 508 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); |
| 509 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 510 | EXPORT_SYMBOL(ieee80211_scan_completed); |
| 511 | |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 512 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
| 513 | struct ieee80211_sub_if_data *sdata) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 514 | { |
Johannes Berg | fe57d9f | 2012-07-26 14:55:08 +0200 | [diff] [blame] | 515 | /* Software scan is not supported in multi-channel cases */ |
| 516 | if (local->use_chanctx) |
| 517 | return -EOPNOTSUPP; |
| 518 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 519 | /* |
| 520 | * Hardware/driver doesn't support hw_scan, so use software |
| 521 | * scanning instead. First send a nullfunc frame with power save |
| 522 | * bit on so that AP will buffer the frames for us while we are not |
| 523 | * listening, then send probe requests to each channel and wait for |
| 524 | * the responses. After all channels are scanned, tune back to the |
| 525 | * original channel and send a nullfunc frame with power save bit |
| 526 | * off to trigger the AP to send us all the buffered frames. |
| 527 | * |
| 528 | * Note that while local->sw_scanning is true everything else but |
| 529 | * nullfunc frames and probe requests will be dropped in |
| 530 | * ieee80211_tx_h_check_assoc(). |
| 531 | */ |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 532 | drv_sw_scan_start(local, sdata, local->scan_addr); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 533 | |
Rajkumar Manoharan | de312db | 2012-03-27 11:01:06 +0530 | [diff] [blame] | 534 | local->leave_oper_channel_time = jiffies; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 535 | local->next_scan_state = SCAN_DECISION; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 536 | local->scan_channel_idx = 0; |
| 537 | |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 538 | ieee80211_offchannel_stop_vifs(local); |
Johannes Berg | a80f7c0 | 2009-12-23 13:15:32 +0100 | [diff] [blame] | 539 | |
Seth Forshee | 9c35d7d | 2013-02-11 11:21:08 -0600 | [diff] [blame] | 540 | /* ensure nullfunc is transmitted before leaving operating channel */ |
Emmanuel Grumbach | 3b24f4c | 2015-01-07 15:42:39 +0200 | [diff] [blame] | 541 | ieee80211_flush_queues(local, NULL, false); |
Seth Forshee | 9c35d7d | 2013-02-11 11:21:08 -0600 | [diff] [blame] | 542 | |
Johannes Berg | 3ac64be | 2009-08-17 16:16:53 +0200 | [diff] [blame] | 543 | ieee80211_configure_filter(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 544 | |
Ben Greear | 59bdf3b | 2011-02-07 13:44:38 -0800 | [diff] [blame] | 545 | /* We need to set power level at maximum rate for scanning. */ |
| 546 | ieee80211_hw_config(local, 0); |
| 547 | |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 548 | ieee80211_queue_delayed_work(&local->hw, |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 549 | &local->scan_work, 0); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
Aaron Komisar | dc0c18e | 2019-10-02 13:59:07 +0000 | [diff] [blame] | 554 | static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) |
| 555 | { |
| 556 | struct ieee80211_local *local = sdata->local; |
| 557 | struct ieee80211_sub_if_data *sdata_iter; |
| 558 | |
| 559 | if (!ieee80211_is_radar_required(local)) |
| 560 | return true; |
| 561 | |
| 562 | if (!regulatory_pre_cac_allowed(local->hw.wiphy)) |
| 563 | return false; |
| 564 | |
| 565 | mutex_lock(&local->iflist_mtx); |
| 566 | list_for_each_entry(sdata_iter, &local->interfaces, list) { |
| 567 | if (sdata_iter->wdev.cac_started) { |
| 568 | mutex_unlock(&local->iflist_mtx); |
| 569 | return false; |
| 570 | } |
| 571 | } |
| 572 | mutex_unlock(&local->iflist_mtx); |
| 573 | |
| 574 | return true; |
| 575 | } |
| 576 | |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 577 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
| 578 | struct ieee80211_sub_if_data *sdata) |
| 579 | { |
Aaron Komisar | dc0c18e | 2019-10-02 13:59:07 +0000 | [diff] [blame] | 580 | if (!__ieee80211_can_leave_ch(sdata)) |
Simon Wunderlich | 164eb02 | 2013-02-08 18:16:20 +0100 | [diff] [blame] | 581 | return false; |
| 582 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 583 | if (!list_empty(&local->roc_list)) |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 584 | return false; |
| 585 | |
| 586 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
Stanislaw Gruszka | 392b9ff | 2013-08-27 11:36:35 +0200 | [diff] [blame] | 587 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 588 | return false; |
| 589 | |
| 590 | return true; |
| 591 | } |
| 592 | |
| 593 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) |
| 594 | { |
| 595 | lockdep_assert_held(&local->mtx); |
| 596 | |
| 597 | if (!local->scan_req || local->scanning) |
| 598 | return; |
| 599 | |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 600 | if (!ieee80211_can_scan(local, |
| 601 | rcu_dereference_protected( |
| 602 | local->scan_sdata, |
| 603 | lockdep_is_held(&local->mtx)))) |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 604 | return; |
| 605 | |
| 606 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, |
| 607 | round_jiffies_relative(0)); |
| 608 | } |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 609 | |
Johannes Berg | 45ad683 | 2018-05-28 15:47:39 +0200 | [diff] [blame] | 610 | static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, |
| 611 | const u8 *src, const u8 *dst, |
| 612 | const u8 *ssid, size_t ssid_len, |
| 613 | const u8 *ie, size_t ie_len, |
| 614 | u32 ratemask, u32 flags, u32 tx_flags, |
| 615 | struct ieee80211_channel *channel) |
| 616 | { |
| 617 | struct sk_buff *skb; |
| 618 | |
| 619 | skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, |
| 620 | ssid, ssid_len, |
| 621 | ie, ie_len, flags); |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 622 | |
Johannes Berg | 45ad683 | 2018-05-28 15:47:39 +0200 | [diff] [blame] | 623 | if (skb) { |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 624 | if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { |
| 625 | struct ieee80211_hdr *hdr = (void *)skb->data; |
Mathy Vanhoef | 2b3dab1 | 2020-07-23 14:01:51 +0400 | [diff] [blame] | 626 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 627 | u16 sn = get_random_u32(); |
| 628 | |
Mathy Vanhoef | 2b3dab1 | 2020-07-23 14:01:51 +0400 | [diff] [blame] | 629 | info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 630 | hdr->seq_ctrl = |
| 631 | cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); |
| 632 | } |
Johannes Berg | 45ad683 | 2018-05-28 15:47:39 +0200 | [diff] [blame] | 633 | IEEE80211_SKB_CB(skb)->flags |= tx_flags; |
Mathy Vanhoef | 08aca29 | 2020-07-23 14:01:52 +0400 | [diff] [blame] | 634 | ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); |
Johannes Berg | 45ad683 | 2018-05-28 15:47:39 +0200 | [diff] [blame] | 635 | } |
| 636 | } |
| 637 | |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 638 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
| 639 | unsigned long *next_delay) |
| 640 | { |
| 641 | int i; |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 642 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 643 | struct cfg80211_scan_request *scan_req; |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 644 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 645 | u32 flags = 0, tx_flags; |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 646 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 647 | scan_req = rcu_dereference_protected(local->scan_req, |
| 648 | lockdep_is_held(&local->mtx)); |
| 649 | |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 650 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 651 | if (scan_req->no_cck) |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 652 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 653 | if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
| 654 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
| 655 | if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) |
| 656 | flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 657 | |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 658 | sdata = rcu_dereference_protected(local->scan_sdata, |
Peter Senna Tschudin | 316b6b5 | 2012-09-06 18:09:16 +0200 | [diff] [blame] | 659 | lockdep_is_held(&local->mtx)); |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 660 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 661 | for (i = 0; i < scan_req->n_ssids; i++) |
Johannes Berg | 45ad683 | 2018-05-28 15:47:39 +0200 | [diff] [blame] | 662 | ieee80211_send_scan_probe_req( |
Jouni Malinen | e345f44 | 2016-02-26 22:12:48 +0200 | [diff] [blame] | 663 | sdata, local->scan_addr, scan_req->bssid, |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 664 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
| 665 | scan_req->ie, scan_req->ie_len, |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 666 | scan_req->rates[band], flags, |
Johannes Berg | 45ad683 | 2018-05-28 15:47:39 +0200 | [diff] [blame] | 667 | tx_flags, local->hw.conf.chandef.chan); |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 668 | |
| 669 | /* |
| 670 | * After sending probe requests, wait for probe responses |
| 671 | * on the channel. |
| 672 | */ |
| 673 | *next_delay = IEEE80211_CHANNEL_TIME; |
| 674 | local->next_scan_state = SCAN_DECISION; |
| 675 | } |
| 676 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 677 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
| 678 | struct cfg80211_scan_request *req) |
| 679 | { |
| 680 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | e9da68d | 2018-10-18 10:35:47 +0200 | [diff] [blame] | 681 | bool hw_scan = local->ops->hw_scan; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 682 | int rc; |
| 683 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 684 | lockdep_assert_held(&local->mtx); |
| 685 | |
Aaron Komisar | dc0c18e | 2019-10-02 13:59:07 +0000 | [diff] [blame] | 686 | if (local->scan_req) |
| 687 | return -EBUSY; |
| 688 | |
| 689 | if (!__ieee80211_can_leave_ch(sdata)) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 690 | return -EBUSY; |
| 691 | |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 692 | if (!ieee80211_can_scan(local, sdata)) { |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 693 | /* wait for the work to finish/time out */ |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 694 | rcu_assign_pointer(local->scan_req, req); |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 695 | rcu_assign_pointer(local->scan_sdata, sdata); |
Johannes Berg | c0ce77b | 2010-02-03 10:22:31 +0100 | [diff] [blame] | 696 | return 0; |
| 697 | } |
| 698 | |
Johannes Berg | e9da68d | 2018-10-18 10:35:47 +0200 | [diff] [blame] | 699 | again: |
| 700 | if (hw_scan) { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 701 | u8 *ies; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 702 | |
David Spinadel | e4dcbb3 | 2014-02-11 13:45:41 +0200 | [diff] [blame] | 703 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 704 | |
Johannes Berg | 30686bf | 2015-06-02 21:39:54 +0200 | [diff] [blame] | 705 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 706 | int i, n_bands = 0; |
| 707 | u8 bands_counted = 0; |
| 708 | |
| 709 | for (i = 0; i < req->n_channels; i++) { |
| 710 | if (bands_counted & BIT(req->channels[i]->band)) |
| 711 | continue; |
| 712 | bands_counted |= BIT(req->channels[i]->band); |
| 713 | n_bands++; |
| 714 | } |
| 715 | |
| 716 | local->hw_scan_ies_bufsize *= n_bands; |
| 717 | } |
| 718 | |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 719 | local->hw_scan_req = kmalloc( |
| 720 | sizeof(*local->hw_scan_req) + |
| 721 | req->n_channels * sizeof(req->channels[0]) + |
Johannes Berg | c604b9f | 2012-11-29 12:45:18 +0100 | [diff] [blame] | 722 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 723 | if (!local->hw_scan_req) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 724 | return -ENOMEM; |
| 725 | |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 726 | local->hw_scan_req->req.ssids = req->ssids; |
| 727 | local->hw_scan_req->req.n_ssids = req->n_ssids; |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 728 | ies = (u8 *)local->hw_scan_req + |
| 729 | sizeof(*local->hw_scan_req) + |
| 730 | req->n_channels * sizeof(req->channels[0]); |
David Spinadel | c56ef67 | 2014-02-05 15:21:13 +0200 | [diff] [blame] | 731 | local->hw_scan_req->req.ie = ies; |
| 732 | local->hw_scan_req->req.flags = req->flags; |
Jouni Malinen | e345f44 | 2016-02-26 22:12:48 +0200 | [diff] [blame] | 733 | eth_broadcast_addr(local->hw_scan_req->req.bssid); |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 734 | local->hw_scan_req->req.duration = req->duration; |
| 735 | local->hw_scan_req->req.duration_mandatory = |
| 736 | req->duration_mandatory; |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 737 | |
| 738 | local->hw_scan_band = 0; |
Tova Mussai | c8cb5b8 | 2020-09-18 11:33:13 +0200 | [diff] [blame] | 739 | local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; |
| 740 | local->hw_scan_req->req.scan_6ghz_params = |
| 741 | req->scan_6ghz_params; |
| 742 | local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 743 | |
| 744 | /* |
| 745 | * After allocating local->hw_scan_req, we must |
| 746 | * go through until ieee80211_prep_hw_scan(), so |
| 747 | * anything that might be changed here and leave |
| 748 | * this function early must not go after this |
| 749 | * allocation. |
| 750 | */ |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 751 | } |
| 752 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 753 | rcu_assign_pointer(local->scan_req, req); |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 754 | rcu_assign_pointer(local->scan_sdata, sdata); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 755 | |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 756 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
| 757 | get_random_mask_addr(local->scan_addr, |
| 758 | req->mac_addr, |
| 759 | req->mac_addr_mask); |
| 760 | else |
| 761 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); |
| 762 | |
Johannes Berg | e9da68d | 2018-10-18 10:35:47 +0200 | [diff] [blame] | 763 | if (hw_scan) { |
Helmut Schaa | fbe9c429 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 764 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 765 | } else if ((req->n_channels == 1) && |
Karl Beldan | 675a0b0 | 2013-03-25 16:26:57 +0100 | [diff] [blame] | 766 | (req->channels[0] == local->_oper_chandef.chan)) { |
Johannes Berg | 9b86487 | 2012-07-26 14:38:32 +0200 | [diff] [blame] | 767 | /* |
| 768 | * If we are scanning only on the operating channel |
| 769 | * then we do not need to stop normal activities |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 770 | */ |
| 771 | unsigned long next_delay; |
| 772 | |
| 773 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); |
| 774 | |
| 775 | ieee80211_recalc_idle(local); |
| 776 | |
| 777 | /* Notify driver scan is starting, keep order of operations |
| 778 | * same as normal software scan, in case that matters. */ |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 779 | drv_sw_scan_start(local, sdata, local->scan_addr); |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 780 | |
| 781 | ieee80211_configure_filter(local); /* accept probe-responses */ |
| 782 | |
| 783 | /* We need to ensure power level is at max for scanning. */ |
| 784 | ieee80211_hw_config(local, 0); |
| 785 | |
Antonio Quartulli | 4e39cca | 2015-11-21 18:13:40 +0800 | [diff] [blame] | 786 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
| 787 | IEEE80211_CHAN_RADAR)) || |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 788 | !req->n_ssids) { |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 789 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
| 790 | } else { |
| 791 | ieee80211_scan_state_send_probe(local, &next_delay); |
| 792 | next_delay = IEEE80211_CHANNEL_TIME; |
| 793 | } |
| 794 | |
| 795 | /* Now, just wait a bit and we are all done! */ |
| 796 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, |
| 797 | next_delay); |
| 798 | return 0; |
| 799 | } else { |
| 800 | /* Do normal software scan */ |
Helmut Schaa | fbe9c429 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 801 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 802 | } |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 803 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 804 | ieee80211_recalc_idle(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 805 | |
Johannes Berg | e9da68d | 2018-10-18 10:35:47 +0200 | [diff] [blame] | 806 | if (hw_scan) { |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 807 | WARN_ON(!ieee80211_prep_hw_scan(sdata)); |
Johannes Berg | a060bbf | 2010-04-27 11:59:34 +0200 | [diff] [blame] | 808 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
Johannes Berg | a344d67 | 2014-06-12 22:24:31 +0200 | [diff] [blame] | 809 | } else { |
| 810 | rc = ieee80211_start_sw_scan(local, sdata); |
| 811 | } |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 812 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 813 | if (rc) { |
Johannes Berg | 4d36ec5 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 814 | kfree(local->hw_scan_req); |
| 815 | local->hw_scan_req = NULL; |
Helmut Schaa | fbe9c429 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 816 | local->scanning = 0; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 817 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 818 | ieee80211_recalc_idle(local); |
| 819 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 820 | local->scan_req = NULL; |
Monam Agarwal | 0c2bef46 | 2014-03-24 00:51:43 +0530 | [diff] [blame] | 821 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 822 | } |
| 823 | |
Johannes Berg | e9da68d | 2018-10-18 10:35:47 +0200 | [diff] [blame] | 824 | if (hw_scan && rc == 1) { |
| 825 | /* |
| 826 | * we can't fall back to software for P2P-GO |
| 827 | * as it must update NoA etc. |
| 828 | */ |
| 829 | if (ieee80211_vif_type_p2p(&sdata->vif) == |
| 830 | NL80211_IFTYPE_P2P_GO) |
| 831 | return -EOPNOTSUPP; |
| 832 | hw_scan = false; |
| 833 | goto again; |
| 834 | } |
| 835 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 836 | return rc; |
| 837 | } |
| 838 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 839 | static unsigned long |
| 840 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) |
| 841 | { |
| 842 | /* |
| 843 | * TODO: channel switching also consumes quite some time, |
| 844 | * add that delay as well to get a better estimation |
| 845 | */ |
Antonio Quartulli | 4e39cca | 2015-11-21 18:13:40 +0800 | [diff] [blame] | 846 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 847 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
| 848 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; |
| 849 | } |
| 850 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 851 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
| 852 | unsigned long *next_delay) |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 853 | { |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 854 | bool associated = false; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 855 | bool tx_empty = true; |
| 856 | bool bad_latency; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 857 | struct ieee80211_sub_if_data *sdata; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 858 | struct ieee80211_channel *next_chan; |
Sam Leffler | cd2bb51 | 2012-10-11 21:03:35 -0700 | [diff] [blame] | 859 | enum mac80211_scan_state next_scan_state; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 860 | struct cfg80211_scan_request *scan_req; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 861 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 862 | /* |
| 863 | * check if at least one STA interface is associated, |
| 864 | * check if at least one STA interface has pending tx frames |
| 865 | * and grab the lowest used beacon interval |
| 866 | */ |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 867 | mutex_lock(&local->iflist_mtx); |
| 868 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | 9607e6b66 | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 869 | if (!ieee80211_sdata_running(sdata)) |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 870 | continue; |
| 871 | |
| 872 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
| 873 | if (sdata->u.mgd.associated) { |
| 874 | associated = true; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 875 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 876 | if (!qdisc_all_tx_empty(sdata->dev)) { |
| 877 | tx_empty = false; |
| 878 | break; |
| 879 | } |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 880 | } |
| 881 | } |
| 882 | } |
| 883 | mutex_unlock(&local->iflist_mtx); |
| 884 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 885 | scan_req = rcu_dereference_protected(local->scan_req, |
| 886 | lockdep_is_held(&local->mtx)); |
| 887 | |
| 888 | next_chan = scan_req->channels[local->scan_channel_idx]; |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 889 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 890 | /* |
| 891 | * we're currently scanning a different channel, let's |
| 892 | * see if we can scan another channel without interfering |
| 893 | * with the current traffic situation. |
| 894 | * |
Stanislaw Gruszka | 3f892b6 | 2013-01-23 12:32:45 +0100 | [diff] [blame] | 895 | * Keep good latency, do not stay off-channel more than 125 ms. |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 896 | */ |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 897 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 898 | bad_latency = time_after(jiffies + |
Stanislaw Gruszka | 3f892b6 | 2013-01-23 12:32:45 +0100 | [diff] [blame] | 899 | ieee80211_scan_get_channel_time(next_chan), |
| 900 | local->leave_oper_channel_time + HZ / 8); |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 901 | |
Sam Leffler | cd2bb51 | 2012-10-11 21:03:35 -0700 | [diff] [blame] | 902 | if (associated && !tx_empty) { |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 903 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
Sam Leffler | cd2bb51 | 2012-10-11 21:03:35 -0700 | [diff] [blame] | 904 | next_scan_state = SCAN_ABORT; |
| 905 | else |
| 906 | next_scan_state = SCAN_SUSPEND; |
Stanislaw Gruszka | 3f892b6 | 2013-01-23 12:32:45 +0100 | [diff] [blame] | 907 | } else if (associated && bad_latency) { |
Sam Leffler | cd2bb51 | 2012-10-11 21:03:35 -0700 | [diff] [blame] | 908 | next_scan_state = SCAN_SUSPEND; |
| 909 | } else { |
| 910 | next_scan_state = SCAN_SET_CHANNEL; |
| 911 | } |
| 912 | |
| 913 | local->next_scan_state = next_scan_state; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 914 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 915 | *next_delay = 0; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
| 919 | unsigned long *next_delay) |
| 920 | { |
| 921 | int skip; |
| 922 | struct ieee80211_channel *chan; |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 923 | enum nl80211_bss_scan_width oper_scan_width; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 924 | struct cfg80211_scan_request *scan_req; |
| 925 | |
| 926 | scan_req = rcu_dereference_protected(local->scan_req, |
| 927 | lockdep_is_held(&local->mtx)); |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 928 | |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 929 | skip = 0; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 930 | chan = scan_req->channels[local->scan_channel_idx]; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 931 | |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 932 | local->scan_chandef.chan = chan; |
| 933 | local->scan_chandef.center_freq1 = chan->center_freq; |
Thomas Pedersen | b6011960 | 2020-04-01 18:18:04 -0700 | [diff] [blame] | 934 | local->scan_chandef.freq1_offset = chan->freq_offset; |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 935 | local->scan_chandef.center_freq2 = 0; |
Thomas Pedersen | 75b1593 | 2020-09-21 19:28:03 -0700 | [diff] [blame] | 936 | |
| 937 | /* For scanning on the S1G band, ignore scan_width (which is constant |
| 938 | * across all channels) for now since channel width is specific to each |
| 939 | * channel. Detect the required channel width here and likely revisit |
| 940 | * later. Maybe scan_width could be used to build the channel scan list? |
| 941 | */ |
| 942 | if (chan->band == NL80211_BAND_S1GHZ) { |
| 943 | local->scan_chandef.width = ieee80211_s1g_channel_width(chan); |
| 944 | goto set_channel; |
| 945 | } |
| 946 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 947 | switch (scan_req->scan_width) { |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 948 | case NL80211_BSS_CHAN_WIDTH_5: |
| 949 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; |
| 950 | break; |
| 951 | case NL80211_BSS_CHAN_WIDTH_10: |
| 952 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; |
| 953 | break; |
Thomas Pedersen | df78a0c | 2020-06-01 23:22:47 -0700 | [diff] [blame] | 954 | default: |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 955 | case NL80211_BSS_CHAN_WIDTH_20: |
| 956 | /* If scanning on oper channel, use whatever channel-type |
| 957 | * is currently in use. |
| 958 | */ |
| 959 | oper_scan_width = cfg80211_chandef_to_scan_width( |
| 960 | &local->_oper_chandef); |
| 961 | if (chan == local->_oper_chandef.chan && |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 962 | oper_scan_width == scan_req->scan_width) |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 963 | local->scan_chandef = local->_oper_chandef; |
| 964 | else |
| 965 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; |
| 966 | break; |
Thomas Pedersen | 75b1593 | 2020-09-21 19:28:03 -0700 | [diff] [blame] | 967 | case NL80211_BSS_CHAN_WIDTH_1: |
| 968 | case NL80211_BSS_CHAN_WIDTH_2: |
| 969 | /* shouldn't get here, S1G handled above */ |
| 970 | WARN_ON(1); |
| 971 | break; |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 972 | } |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 973 | |
Thomas Pedersen | 75b1593 | 2020-09-21 19:28:03 -0700 | [diff] [blame] | 974 | set_channel: |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 975 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
| 976 | skip = 1; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 977 | |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 978 | /* advance state machine to next channel/band */ |
| 979 | local->scan_channel_idx++; |
| 980 | |
Helmut Schaa | 0ee9c13 | 2009-07-25 17:25:51 +0200 | [diff] [blame] | 981 | if (skip) { |
| 982 | /* if we skip this channel return to the decision state */ |
| 983 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 984 | return; |
Helmut Schaa | 0ee9c13 | 2009-07-25 17:25:51 +0200 | [diff] [blame] | 985 | } |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 986 | |
| 987 | /* |
| 988 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 |
| 989 | * (which unfortunately doesn't say _why_ step a) is done, |
| 990 | * but it waits for the probe delay or until a frame is |
| 991 | * received - and the received frame would update the NAV). |
| 992 | * For now, we do not support waiting until a frame is |
| 993 | * received. |
| 994 | * |
| 995 | * In any case, it is not necessary for a passive scan. |
| 996 | */ |
Antonio Quartulli | 4e39cca | 2015-11-21 18:13:40 +0800 | [diff] [blame] | 997 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
| 998 | !scan_req->n_ssids) { |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 999 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 1000 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 1001 | return; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 1002 | } |
| 1003 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 1004 | /* active scan, send probes */ |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 1005 | *next_delay = IEEE80211_PROBE_DELAY; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 1006 | local->next_scan_state = SCAN_SEND_PROBE; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 1007 | } |
| 1008 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1009 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
| 1010 | unsigned long *next_delay) |
| 1011 | { |
| 1012 | /* switch back to the operating channel */ |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 1013 | local->scan_chandef.chan = NULL; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1014 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
| 1015 | |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 1016 | /* disable PS */ |
| 1017 | ieee80211_offchannel_return(local); |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1018 | |
| 1019 | *next_delay = HZ / 5; |
| 1020 | /* afterwards, resume scan & go to next channel */ |
| 1021 | local->next_scan_state = SCAN_RESUME; |
| 1022 | } |
| 1023 | |
| 1024 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, |
| 1025 | unsigned long *next_delay) |
| 1026 | { |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 1027 | ieee80211_offchannel_stop_vifs(local); |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1028 | |
| 1029 | if (local->ops->flush) { |
Emmanuel Grumbach | 3b24f4c | 2015-01-07 15:42:39 +0200 | [diff] [blame] | 1030 | ieee80211_flush_queues(local, NULL, false); |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1031 | *next_delay = 0; |
| 1032 | } else |
| 1033 | *next_delay = HZ / 10; |
| 1034 | |
| 1035 | /* remember when we left the operating channel */ |
| 1036 | local->leave_oper_channel_time = jiffies; |
| 1037 | |
| 1038 | /* advance to the next channel to be scanned */ |
Mohammed Shafi Shajakhan | de2ee84 | 2011-12-24 18:43:28 +0530 | [diff] [blame] | 1039 | local->next_scan_state = SCAN_SET_CHANNEL; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1040 | } |
| 1041 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 1042 | void ieee80211_scan_work(struct work_struct *work) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1043 | { |
| 1044 | struct ieee80211_local *local = |
| 1045 | container_of(work, struct ieee80211_local, scan_work.work); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 1046 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1047 | struct cfg80211_scan_request *scan_req; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1048 | unsigned long next_delay = 0; |
Eliad Peller | 8bd2a24 | 2013-12-05 11:21:27 +0200 | [diff] [blame] | 1049 | bool aborted; |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 1050 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 1051 | mutex_lock(&local->mtx); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1052 | |
Luciano Coelho | 332ff7f | 2015-01-22 23:34:10 +0200 | [diff] [blame] | 1053 | if (!ieee80211_can_run_worker(local)) { |
| 1054 | aborted = true; |
| 1055 | goto out_complete; |
| 1056 | } |
| 1057 | |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 1058 | sdata = rcu_dereference_protected(local->scan_sdata, |
| 1059 | lockdep_is_held(&local->mtx)); |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1060 | scan_req = rcu_dereference_protected(local->scan_req, |
| 1061 | lockdep_is_held(&local->mtx)); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 1062 | |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 1063 | /* When scanning on-channel, the first-callback means completed. */ |
| 1064 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { |
| 1065 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
| 1066 | goto out_complete; |
| 1067 | } |
| 1068 | |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1069 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
| 1070 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
| 1071 | goto out_complete; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1072 | } |
| 1073 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1074 | if (!sdata || !scan_req) |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1075 | goto out; |
| 1076 | |
Eliad Peller | ff5db43 | 2014-11-12 10:08:29 +0200 | [diff] [blame] | 1077 | if (!local->scanning) { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1078 | int rc; |
| 1079 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1080 | RCU_INIT_POINTER(local->scan_req, NULL); |
Monam Agarwal | 0c2bef46 | 2014-03-24 00:51:43 +0530 | [diff] [blame] | 1081 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1082 | |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1083 | rc = __ieee80211_start_scan(sdata, scan_req); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1084 | if (rc) { |
Stanislaw Gruszka | 3aed49e | 2010-10-06 11:22:12 +0200 | [diff] [blame] | 1085 | /* need to complete scan in cfg80211 */ |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1086 | rcu_assign_pointer(local->scan_req, scan_req); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1087 | aborted = true; |
| 1088 | goto out_complete; |
| 1089 | } else |
| 1090 | goto out; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1091 | } |
| 1092 | |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 1093 | /* |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 1094 | * as long as no delay is required advance immediately |
| 1095 | * without scheduling a new work |
| 1096 | */ |
| 1097 | do { |
Rajkumar Manoharan | c29acf2 | 2011-05-14 09:43:28 +0530 | [diff] [blame] | 1098 | if (!ieee80211_sdata_running(sdata)) { |
| 1099 | aborted = true; |
| 1100 | goto out_complete; |
| 1101 | } |
| 1102 | |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 1103 | switch (local->next_scan_state) { |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 1104 | case SCAN_DECISION: |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 1105 | /* if no more bands/channels left, complete scan */ |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1106 | if (local->scan_channel_idx >= scan_req->n_channels) { |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 1107 | aborted = false; |
| 1108 | goto out_complete; |
| 1109 | } |
| 1110 | ieee80211_scan_state_decision(local, &next_delay); |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 1111 | break; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 1112 | case SCAN_SET_CHANNEL: |
| 1113 | ieee80211_scan_state_set_channel(local, &next_delay); |
| 1114 | break; |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 1115 | case SCAN_SEND_PROBE: |
| 1116 | ieee80211_scan_state_send_probe(local, &next_delay); |
| 1117 | break; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1118 | case SCAN_SUSPEND: |
| 1119 | ieee80211_scan_state_suspend(local, &next_delay); |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 1120 | break; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 1121 | case SCAN_RESUME: |
| 1122 | ieee80211_scan_state_resume(local, &next_delay); |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 1123 | break; |
Sam Leffler | cd2bb51 | 2012-10-11 21:03:35 -0700 | [diff] [blame] | 1124 | case SCAN_ABORT: |
| 1125 | aborted = true; |
| 1126 | goto out_complete; |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 1127 | } |
| 1128 | } while (next_delay == 0); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1129 | |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 1130 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 1131 | goto out; |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1132 | |
| 1133 | out_complete: |
Eliad Peller | 8bd2a24 | 2013-12-05 11:21:27 +0200 | [diff] [blame] | 1134 | __ieee80211_scan_completed(&local->hw, aborted); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 1135 | out: |
| 1136 | mutex_unlock(&local->mtx); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1137 | } |
| 1138 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 1139 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1140 | struct cfg80211_scan_request *req) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1141 | { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1142 | int res; |
| 1143 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 1144 | mutex_lock(&sdata->local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1145 | res = __ieee80211_start_scan(sdata, req); |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 1146 | mutex_unlock(&sdata->local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1147 | |
| 1148 | return res; |
| 1149 | } |
| 1150 | |
Stanislaw Gruszka | 34bcf71 | 2012-12-11 10:48:23 +0100 | [diff] [blame] | 1151 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
| 1152 | const u8 *ssid, u8 ssid_len, |
Janusz.Dziedzic@tieto.com | 76bed0f | 2015-03-20 06:37:00 +0100 | [diff] [blame] | 1153 | struct ieee80211_channel **channels, |
| 1154 | unsigned int n_channels, |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 1155 | enum nl80211_bss_scan_width scan_width) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1156 | { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1157 | struct ieee80211_local *local = sdata->local; |
Janusz.Dziedzic@tieto.com | 76bed0f | 2015-03-20 06:37:00 +0100 | [diff] [blame] | 1158 | int ret = -EBUSY, i, n_ch = 0; |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1159 | enum nl80211_band band; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1160 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 1161 | mutex_lock(&local->mtx); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1162 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1163 | /* busy scanning */ |
| 1164 | if (local->scan_req) |
| 1165 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1166 | |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1167 | /* fill internal scan request */ |
Janusz.Dziedzic@tieto.com | 76bed0f | 2015-03-20 06:37:00 +0100 | [diff] [blame] | 1168 | if (!channels) { |
| 1169 | int max_n; |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1170 | |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1171 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
Tova Mussai | c8cb5b8 | 2020-09-18 11:33:13 +0200 | [diff] [blame] | 1172 | if (!local->hw.wiphy->bands[band] || |
| 1173 | band == NL80211_BAND_6GHZ) |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1174 | continue; |
Stanislaw Gruszka | 34bcf71 | 2012-12-11 10:48:23 +0100 | [diff] [blame] | 1175 | |
| 1176 | max_n = local->hw.wiphy->bands[band]->n_channels; |
| 1177 | for (i = 0; i < max_n; i++) { |
| 1178 | struct ieee80211_channel *tmp_ch = |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1179 | &local->hw.wiphy->bands[band]->channels[i]; |
Stanislaw Gruszka | 34bcf71 | 2012-12-11 10:48:23 +0100 | [diff] [blame] | 1180 | |
Luis R. Rodriguez | 8fe02e1 | 2013-10-21 19:22:25 +0200 | [diff] [blame] | 1181 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
Stanislaw Gruszka | 34bcf71 | 2012-12-11 10:48:23 +0100 | [diff] [blame] | 1182 | IEEE80211_CHAN_DISABLED)) |
| 1183 | continue; |
| 1184 | |
| 1185 | local->int_scan_req->channels[n_ch] = tmp_ch; |
| 1186 | n_ch++; |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1187 | } |
| 1188 | } |
| 1189 | |
Stanislaw Gruszka | 34bcf71 | 2012-12-11 10:48:23 +0100 | [diff] [blame] | 1190 | if (WARN_ON_ONCE(n_ch == 0)) |
| 1191 | goto unlock; |
| 1192 | |
| 1193 | local->int_scan_req->n_channels = n_ch; |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1194 | } else { |
Janusz.Dziedzic@tieto.com | 76bed0f | 2015-03-20 06:37:00 +0100 | [diff] [blame] | 1195 | for (i = 0; i < n_channels; i++) { |
| 1196 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | |
| 1197 | IEEE80211_CHAN_DISABLED)) |
| 1198 | continue; |
| 1199 | |
| 1200 | local->int_scan_req->channels[n_ch] = channels[i]; |
| 1201 | n_ch++; |
| 1202 | } |
| 1203 | |
| 1204 | if (WARN_ON_ONCE(n_ch == 0)) |
Stanislaw Gruszka | 34bcf71 | 2012-12-11 10:48:23 +0100 | [diff] [blame] | 1205 | goto unlock; |
| 1206 | |
Janusz.Dziedzic@tieto.com | 76bed0f | 2015-03-20 06:37:00 +0100 | [diff] [blame] | 1207 | local->int_scan_req->n_channels = n_ch; |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 1208 | } |
| 1209 | |
| 1210 | local->int_scan_req->ssids = &local->scan_ssid; |
| 1211 | local->int_scan_req->n_ssids = 1; |
Simon Wunderlich | 7ca15a0 | 2013-07-08 16:55:56 +0200 | [diff] [blame] | 1212 | local->int_scan_req->scan_width = scan_width; |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 1213 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
| 1214 | local->int_scan_req->ssids[0].ssid_len = ssid_len; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1215 | |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 1216 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1217 | unlock: |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 1218 | mutex_unlock(&local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 1219 | return ret; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1220 | } |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1221 | |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 1222 | /* |
| 1223 | * Only call this function when a scan can't be queued -- under RTNL. |
| 1224 | */ |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1225 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
| 1226 | { |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1227 | /* |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1228 | * We are canceling software scan, or deferred scan that was not |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 1229 | * yet really started (see __ieee80211_start_scan ). |
| 1230 | * |
| 1231 | * Regarding hardware scan: |
| 1232 | * - we can not call __ieee80211_scan_completed() as when |
| 1233 | * SCAN_HW_SCANNING bit is set this function change |
| 1234 | * local->hw_scan_req to operate on 5G band, what race with |
| 1235 | * driver which can use local->hw_scan_req |
| 1236 | * |
| 1237 | * - we can not cancel scan_work since driver can schedule it |
| 1238 | * by ieee80211_scan_completed(..., true) to finish scan |
| 1239 | * |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1240 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
| 1241 | * driver is still responsible for calling ieee80211_scan_completed() |
| 1242 | * after the scan was completed/aborted. |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1243 | */ |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 1244 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 1245 | mutex_lock(&local->mtx); |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1246 | if (!local->scan_req) |
| 1247 | goto out; |
| 1248 | |
Emmanuel Grumbach | a754055 | 2013-09-16 11:12:07 +0300 | [diff] [blame] | 1249 | /* |
| 1250 | * We have a scan running and the driver already reported completion, |
| 1251 | * but the worker hasn't run yet or is stuck on the mutex - mark it as |
| 1252 | * cancelled. |
| 1253 | */ |
| 1254 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && |
| 1255 | test_bit(SCAN_COMPLETED, &local->scanning)) { |
| 1256 | set_bit(SCAN_HW_CANCELLED, &local->scanning); |
| 1257 | goto out; |
| 1258 | } |
| 1259 | |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1260 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
Emmanuel Grumbach | a754055 | 2013-09-16 11:12:07 +0300 | [diff] [blame] | 1261 | /* |
| 1262 | * Make sure that __ieee80211_scan_completed doesn't trigger a |
| 1263 | * scan on another band. |
| 1264 | */ |
| 1265 | set_bit(SCAN_HW_CANCELLED, &local->scanning); |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1266 | if (local->ops->cancel_hw_scan) |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 1267 | drv_cancel_hw_scan(local, |
| 1268 | rcu_dereference_protected(local->scan_sdata, |
| 1269 | lockdep_is_held(&local->mtx))); |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1270 | goto out; |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 1271 | } |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1272 | |
| 1273 | /* |
| 1274 | * If the work is currently running, it must be blocked on |
| 1275 | * the mutex, but we'll set scan_sdata = NULL and it'll |
| 1276 | * simply exit once it acquires the mutex. |
| 1277 | */ |
| 1278 | cancel_delayed_work(&local->scan_work); |
| 1279 | /* and clean up */ |
Avraham Stern | 7947d3e | 2016-07-05 15:23:12 +0300 | [diff] [blame] | 1280 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
Eliad Peller | 8bd2a24 | 2013-12-05 11:21:27 +0200 | [diff] [blame] | 1281 | __ieee80211_scan_completed(&local->hw, true); |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 1282 | out: |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 1283 | mutex_unlock(&local->mtx); |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1284 | } |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1285 | |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1286 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
| 1287 | struct cfg80211_sched_scan_request *req) |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1288 | { |
| 1289 | struct ieee80211_local *local = sdata->local; |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1290 | struct ieee80211_scan_ies sched_scan_ies = {}; |
Simon Wunderlich | 2103dec | 2013-07-08 16:55:53 +0200 | [diff] [blame] | 1291 | struct cfg80211_chan_def chandef; |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1292 | int ret, i, iebufsz, num_bands = 0; |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1293 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1294 | u8 bands_used = 0; |
| 1295 | u8 *ie; |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 1296 | u32 flags = 0; |
Johannes Berg | c604b9f | 2012-11-29 12:45:18 +0100 | [diff] [blame] | 1297 | |
David Spinadel | e4dcbb3 | 2014-02-11 13:45:41 +0200 | [diff] [blame] | 1298 | iebufsz = local->scan_ies_len + req->ie_len; |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1299 | |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1300 | lockdep_assert_held(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1301 | |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1302 | if (!local->ops->sched_scan_start) |
| 1303 | return -ENOTSUPP; |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1304 | |
Johannes Berg | 57fbcce | 2016-04-12 15:56:15 +0200 | [diff] [blame] | 1305 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1306 | if (local->hw.wiphy->bands[i]) { |
| 1307 | bands_used |= BIT(i); |
| 1308 | rate_masks[i] = (u32) -1; |
| 1309 | num_bands++; |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1310 | } |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1311 | } |
| 1312 | |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 1313 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
| 1314 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
| 1315 | |
Kees Cook | 6396bb2 | 2018-06-12 14:03:40 -0700 | [diff] [blame] | 1316 | ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1317 | if (!ie) { |
| 1318 | ret = -ENOMEM; |
| 1319 | goto out; |
| 1320 | } |
| 1321 | |
| 1322 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
| 1323 | |
Ilan Peer | 2ad2274 | 2020-05-28 21:34:39 +0200 | [diff] [blame] | 1324 | ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, |
Kirtika Ruchandani | cd5861b | 2016-11-23 20:45:49 -0800 | [diff] [blame] | 1325 | &sched_scan_ies, req->ie, |
Johannes Berg | 00387f3 | 2018-05-28 15:47:38 +0200 | [diff] [blame] | 1326 | req->ie_len, bands_used, rate_masks, &chandef, |
Johannes Berg | b9771d4 | 2018-05-28 15:47:41 +0200 | [diff] [blame] | 1327 | flags); |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1328 | |
Johannes Berg | 30dd3ed | 2012-09-04 19:15:01 +0200 | [diff] [blame] | 1329 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1330 | if (ret == 0) { |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1331 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1332 | rcu_assign_pointer(local->sched_scan_req, req); |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1333 | } |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1334 | |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1335 | kfree(ie); |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1336 | |
David Spinadel | 633e271 | 2014-02-06 16:15:23 +0200 | [diff] [blame] | 1337 | out: |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1338 | if (ret) { |
| 1339 | /* Clean in case of failure after HW restart or upon resume. */ |
Monam Agarwal | 0c2bef46 | 2014-03-24 00:51:43 +0530 | [diff] [blame] | 1340 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1341 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1342 | } |
| 1343 | |
| 1344 | return ret; |
| 1345 | } |
| 1346 | |
| 1347 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
| 1348 | struct cfg80211_sched_scan_request *req) |
| 1349 | { |
| 1350 | struct ieee80211_local *local = sdata->local; |
| 1351 | int ret; |
| 1352 | |
| 1353 | mutex_lock(&local->mtx); |
| 1354 | |
| 1355 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
| 1356 | mutex_unlock(&local->mtx); |
| 1357 | return -EBUSY; |
| 1358 | } |
| 1359 | |
| 1360 | ret = __ieee80211_request_sched_scan_start(sdata, req); |
| 1361 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1362 | mutex_unlock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1363 | return ret; |
| 1364 | } |
| 1365 | |
Eliad Peller | 0d440ea | 2015-10-25 10:59:33 +0200 | [diff] [blame] | 1366 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1367 | { |
Eliad Peller | 0d440ea | 2015-10-25 10:59:33 +0200 | [diff] [blame] | 1368 | struct ieee80211_sub_if_data *sched_scan_sdata; |
| 1369 | int ret = -ENOENT; |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1370 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1371 | mutex_lock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1372 | |
| 1373 | if (!local->ops->sched_scan_stop) { |
| 1374 | ret = -ENOTSUPP; |
| 1375 | goto out; |
| 1376 | } |
| 1377 | |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1378 | /* We don't want to restart sched scan anymore. */ |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1379 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1380 | |
Eliad Peller | 0d440ea | 2015-10-25 10:59:33 +0200 | [diff] [blame] | 1381 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
| 1382 | lockdep_is_held(&local->mtx)); |
| 1383 | if (sched_scan_sdata) { |
| 1384 | ret = drv_sched_scan_stop(local, sched_scan_sdata); |
Alexander Bondar | 71228a1 | 2014-03-16 10:49:54 +0200 | [diff] [blame] | 1385 | if (!ret) |
Andreea-Cristina Bernat | ad053a9 | 2014-08-22 16:14:49 +0300 | [diff] [blame] | 1386 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
Alexander Bondar | 71228a1 | 2014-03-16 10:49:54 +0200 | [diff] [blame] | 1387 | } |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1388 | out: |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1389 | mutex_unlock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1390 | |
| 1391 | return ret; |
| 1392 | } |
| 1393 | |
| 1394 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) |
| 1395 | { |
| 1396 | struct ieee80211_local *local = hw_to_local(hw); |
| 1397 | |
| 1398 | trace_api_sched_scan_results(local); |
| 1399 | |
Arend Van Spriel | b34939b | 2017-04-28 13:40:28 +0100 | [diff] [blame] | 1400 | cfg80211_sched_scan_results(hw->wiphy, 0); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1401 | } |
| 1402 | EXPORT_SYMBOL(ieee80211_sched_scan_results); |
| 1403 | |
Johannes Berg | f6837ba8 | 2014-04-30 14:19:04 +0200 | [diff] [blame] | 1404 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1405 | { |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1406 | mutex_lock(&local->mtx); |
| 1407 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1408 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1409 | mutex_unlock(&local->mtx); |
| 1410 | return; |
| 1411 | } |
| 1412 | |
Monam Agarwal | 0c2bef46 | 2014-03-24 00:51:43 +0530 | [diff] [blame] | 1413 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1414 | |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1415 | /* If sched scan was aborted by the driver. */ |
Johannes Berg | 6ea0a69 | 2014-11-19 11:55:49 +0100 | [diff] [blame] | 1416 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
David Spinadel | d43c6b6 | 2013-12-08 21:48:57 +0200 | [diff] [blame] | 1417 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1418 | mutex_unlock(&local->mtx); |
| 1419 | |
Arend Van Spriel | b34939b | 2017-04-28 13:40:28 +0100 | [diff] [blame] | 1420 | cfg80211_sched_scan_stopped(local->hw.wiphy, 0); |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1421 | } |
| 1422 | |
Johannes Berg | f6837ba8 | 2014-04-30 14:19:04 +0200 | [diff] [blame] | 1423 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
| 1424 | { |
| 1425 | struct ieee80211_local *local = |
| 1426 | container_of(work, struct ieee80211_local, |
| 1427 | sched_scan_stopped_work); |
| 1428 | |
| 1429 | ieee80211_sched_scan_end(local); |
| 1430 | } |
| 1431 | |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1432 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
| 1433 | { |
| 1434 | struct ieee80211_local *local = hw_to_local(hw); |
| 1435 | |
| 1436 | trace_api_sched_scan_stopped(local); |
| 1437 | |
Eliad Peller | 2bc533b | 2016-01-05 16:28:06 +0200 | [diff] [blame] | 1438 | /* |
| 1439 | * this shouldn't really happen, so for simplicity |
| 1440 | * simply ignore it, and let mac80211 reconfigure |
| 1441 | * the sched scan later on. |
| 1442 | */ |
| 1443 | if (local->in_reconfig) |
| 1444 | return; |
| 1445 | |
Johannes Berg | 18db594 | 2013-11-06 10:34:36 +0100 | [diff] [blame] | 1446 | schedule_work(&local->sched_scan_stopped_work); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1447 | } |
| 1448 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |