Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 1 | /* |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 2 | * Scanning implementation |
| 3 | * |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| 5 | * Copyright 2004, Instant802 Networks, Inc. |
| 6 | * Copyright 2005, Devicescape Software, Inc. |
| 7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 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> |
Jean Pihet | e8db0be | 2011-08-25 15:35:03 +0200 | [diff] [blame] | 18 | #include <linux/pm_qos.h> |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 19 | #include <net/sch_generic.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 21 | #include <linux/export.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) |
Helmut Schaa | 96f7e73 | 2009-06-30 14:49:18 +0200 | [diff] [blame] | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 31 | |
Johannes Berg | 00d3f14 | 2009-02-10 21:26:00 +0100 | [diff] [blame] | 32 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 33 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 34 | struct ieee80211_bss *bss = (void *)cbss->priv; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 35 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 36 | kfree(bss_mesh_id(bss)); |
| 37 | kfree(bss_mesh_cfg(bss)); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 41 | struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 42 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 43 | if (!bss) |
| 44 | return; |
| 45 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 46 | } |
| 47 | |
Kalle Valo | ab13315 | 2010-01-12 10:42:31 +0200 | [diff] [blame] | 48 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
| 49 | { |
| 50 | u8 qos_info; |
| 51 | |
| 52 | if (elems->wmm_info && elems->wmm_info_len == 7 |
| 53 | && elems->wmm_info[5] == 1) |
| 54 | qos_info = elems->wmm_info[6]; |
| 55 | else if (elems->wmm_param && elems->wmm_param_len == 24 |
| 56 | && elems->wmm_param[5] == 1) |
| 57 | qos_info = elems->wmm_param[6]; |
| 58 | else |
| 59 | /* no valid wmm information or parameter element found */ |
| 60 | return false; |
| 61 | |
| 62 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; |
| 63 | } |
| 64 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 65 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 66 | ieee80211_bss_info_update(struct ieee80211_local *local, |
| 67 | struct ieee80211_rx_status *rx_status, |
| 68 | struct ieee80211_mgmt *mgmt, |
| 69 | size_t len, |
| 70 | struct ieee802_11_elems *elems, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 71 | struct ieee80211_channel *channel, |
| 72 | bool beacon) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 73 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 74 | struct cfg80211_bss *cbss; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 75 | struct ieee80211_bss *bss; |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 76 | int clen, srlen; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 77 | s32 signal = 0; |
| 78 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 79 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 80 | signal = rx_status->signal * 100; |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 81 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 82 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 83 | |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 84 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
| 85 | mgmt, len, signal, GFP_ATOMIC); |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 86 | if (!cbss) |
Johannes Berg | 00d3f14 | 2009-02-10 21:26:00 +0100 | [diff] [blame] | 87 | return NULL; |
| 88 | |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 89 | cbss->free_priv = ieee80211_rx_bss_free; |
| 90 | bss = (void *)cbss->priv; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 91 | |
Johannes Berg | 8c358bc | 2012-05-22 22:13:05 +0200 | [diff] [blame] | 92 | bss->device_ts = rx_status->device_timestamp; |
| 93 | |
Paul Stewart | fcff4f1 | 2012-02-23 17:59:53 -0800 | [diff] [blame] | 94 | if (elems->parse_error) { |
| 95 | if (beacon) |
| 96 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; |
| 97 | else |
| 98 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; |
| 99 | } else { |
| 100 | if (beacon) |
| 101 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; |
| 102 | else |
| 103 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 104 | } |
| 105 | |
Paul Stewart | fcff4f1 | 2012-02-23 17:59:53 -0800 | [diff] [blame] | 106 | /* save the ERP value so that it is available at association time */ |
| 107 | if (elems->erp_info && elems->erp_info_len >= 1 && |
| 108 | (!elems->parse_error || |
| 109 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { |
| 110 | bss->erp_value = elems->erp_info[0]; |
| 111 | bss->has_erp_value = true; |
| 112 | if (!elems->parse_error) |
| 113 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; |
| 114 | } |
| 115 | |
| 116 | if (elems->tim && (!elems->parse_error || |
| 117 | !(bss->valid_data & IEEE80211_BSS_VALID_DTIM))) { |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 118 | struct ieee80211_tim_ie *tim_ie = elems->tim; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 119 | bss->dtim_period = tim_ie->dtim_period; |
Paul Stewart | fcff4f1 | 2012-02-23 17:59:53 -0800 | [diff] [blame] | 120 | if (!elems->parse_error) |
| 121 | bss->valid_data |= IEEE80211_BSS_VALID_DTIM; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 122 | } |
| 123 | |
Johannes Berg | e5b900d | 2010-07-29 16:08:55 +0200 | [diff] [blame] | 124 | /* If the beacon had no TIM IE, or it was invalid, use 1 */ |
| 125 | if (beacon && !bss->dtim_period) |
| 126 | bss->dtim_period = 1; |
| 127 | |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 128 | /* replace old supported rates if we get new values */ |
Paul Stewart | fcff4f1 | 2012-02-23 17:59:53 -0800 | [diff] [blame] | 129 | if (!elems->parse_error || |
| 130 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { |
| 131 | srlen = 0; |
| 132 | if (elems->supp_rates) { |
| 133 | clen = IEEE80211_MAX_SUPP_RATES; |
| 134 | if (clen > elems->supp_rates_len) |
| 135 | clen = elems->supp_rates_len; |
| 136 | memcpy(bss->supp_rates, elems->supp_rates, clen); |
| 137 | srlen += clen; |
| 138 | } |
| 139 | if (elems->ext_supp_rates) { |
| 140 | clen = IEEE80211_MAX_SUPP_RATES - srlen; |
| 141 | if (clen > elems->ext_supp_rates_len) |
| 142 | clen = elems->ext_supp_rates_len; |
| 143 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, |
| 144 | clen); |
| 145 | srlen += clen; |
| 146 | } |
| 147 | if (srlen) { |
| 148 | bss->supp_rates_len = srlen; |
| 149 | if (!elems->parse_error) |
| 150 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; |
| 151 | } |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 152 | } |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 153 | |
Paul Stewart | fcff4f1 | 2012-02-23 17:59:53 -0800 | [diff] [blame] | 154 | if (!elems->parse_error || |
| 155 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { |
| 156 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
| 157 | bss->uapsd_supported = is_uapsd_supported(elems); |
| 158 | if (!elems->parse_error) |
| 159 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; |
| 160 | } |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 161 | |
| 162 | if (!beacon) |
| 163 | bss->last_probe_resp = jiffies; |
| 164 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 165 | return bss; |
| 166 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 167 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 168 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 169 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 170 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 171 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
| 172 | struct ieee80211_mgmt *mgmt = (void *)skb->data; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 173 | struct ieee80211_bss *bss; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 174 | u8 *elements; |
| 175 | struct ieee80211_channel *channel; |
| 176 | size_t baselen; |
| 177 | int freq; |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 178 | bool beacon; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 179 | struct ieee802_11_elems elems; |
| 180 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 181 | if (skb->len < 24 || |
| 182 | (!ieee80211_is_probe_resp(mgmt->frame_control) && |
| 183 | !ieee80211_is_beacon(mgmt->frame_control))) |
| 184 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 185 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 186 | sdata1 = rcu_dereference(local->scan_sdata); |
| 187 | sdata2 = rcu_dereference(local->sched_scan_sdata); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 188 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 189 | if (likely(!sdata1 && !sdata2)) |
| 190 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 191 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 192 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 193 | /* ignore ProbeResp to foreign address */ |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 194 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
| 195 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) |
| 196 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 197 | |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 198 | elements = mgmt->u.probe_resp.variable; |
| 199 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 200 | beacon = false; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 201 | } else { |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 202 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
| 203 | elements = mgmt->u.beacon.variable; |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 204 | beacon = true; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 205 | } |
| 206 | |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 207 | if (baselen > skb->len) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 208 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 209 | |
| 210 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); |
| 211 | |
| 212 | if (elems.ds_params && elems.ds_params_len == 1) |
Bruno Randolf | 59eb21a | 2011-01-17 13:37:28 +0900 | [diff] [blame] | 213 | freq = ieee80211_channel_to_frequency(elems.ds_params[0], |
| 214 | rx_status->band); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 215 | else |
| 216 | freq = rx_status->freq; |
| 217 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 218 | channel = ieee80211_get_channel(local->hw.wiphy, freq); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 219 | |
| 220 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 221 | return; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 222 | |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 223 | bss = ieee80211_bss_info_update(local, rx_status, |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 224 | mgmt, skb->len, &elems, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 225 | channel, beacon); |
Jouni Malinen | d048e50 | 2008-10-11 03:29:55 +0300 | [diff] [blame] | 226 | if (bss) |
Johannes Berg | d48b296 | 2012-07-06 22:19:27 +0200 | [diff] [blame] | 227 | ieee80211_rx_bss_put(local, bss); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 228 | } |
| 229 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 230 | /* return false if no more work */ |
| 231 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) |
| 232 | { |
| 233 | struct cfg80211_scan_request *req = local->scan_req; |
| 234 | enum ieee80211_band band; |
| 235 | int i, ielen, n_chans; |
| 236 | |
| 237 | do { |
| 238 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) |
| 239 | return false; |
| 240 | |
| 241 | band = local->hw_scan_band; |
| 242 | n_chans = 0; |
| 243 | for (i = 0; i < req->n_channels; i++) { |
| 244 | if (req->channels[i]->band == band) { |
| 245 | local->hw_scan_req->channels[n_chans] = |
| 246 | req->channels[i]; |
| 247 | n_chans++; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | local->hw_scan_band++; |
| 252 | } while (!n_chans); |
| 253 | |
| 254 | local->hw_scan_req->n_channels = n_chans; |
| 255 | |
| 256 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, |
Johannes Berg | 8ee3108 | 2011-06-22 16:43:48 +0200 | [diff] [blame] | 257 | req->ie, req->ie_len, band, |
Johannes Berg | 85a237f | 2011-07-18 18:08:36 +0200 | [diff] [blame] | 258 | req->rates[band], 0); |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 259 | local->hw_scan_req->ie_len = ielen; |
Johannes Berg | dcd8397 | 2011-10-04 15:07:33 +0200 | [diff] [blame] | 260 | local->hw_scan_req->no_cck = req->no_cck; |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 261 | |
| 262 | return true; |
| 263 | } |
| 264 | |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 265 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 266 | bool was_hw_scan) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 267 | { |
| 268 | struct ieee80211_local *local = hw_to_local(hw); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 269 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 270 | lockdep_assert_held(&local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 271 | |
Johannes Berg | 6d3560d | 2009-10-31 07:44:08 +0100 | [diff] [blame] | 272 | /* |
| 273 | * It's ok to abort a not-yet-running scan (that |
| 274 | * we have one at all will be verified by checking |
| 275 | * local->scan_req next), but not to complete it |
| 276 | * successfully. |
| 277 | */ |
| 278 | if (WARN_ON(!local->scanning && !aborted)) |
| 279 | aborted = true; |
Johannes Berg | de95a54 | 2009-04-01 11:58:36 +0200 | [diff] [blame] | 280 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 281 | if (WARN_ON(!local->scan_req)) |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 282 | return; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 283 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 284 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 285 | int rc; |
| 286 | |
| 287 | rc = drv_hw_scan(local, |
| 288 | rcu_dereference_protected(local->scan_sdata, |
| 289 | lockdep_is_held(&local->mtx)), |
| 290 | local->hw_scan_req); |
| 291 | |
Stanislaw Gruszka | 6eb11a9 | 2010-10-06 11:22:11 +0200 | [diff] [blame] | 292 | if (rc == 0) |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 293 | return; |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | kfree(local->hw_scan_req); |
| 297 | local->hw_scan_req = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 298 | |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 299 | if (local->scan_req != local->int_scan_req) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 300 | cfg80211_scan_done(local->scan_req, aborted); |
| 301 | local->scan_req = NULL; |
Johannes Berg | 15db0b7 | 2009-08-25 16:33:47 +0200 | [diff] [blame] | 302 | local->scan_sdata = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 303 | |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 304 | local->scanning = 0; |
Johannes Berg | 58905ca | 2009-05-07 14:23:01 +0200 | [diff] [blame] | 305 | local->scan_channel = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 306 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 307 | /* Set power back to normal operating levels. */ |
| 308 | ieee80211_hw_config(local, 0); |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 309 | |
| 310 | if (!was_hw_scan) { |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 311 | ieee80211_configure_filter(local); |
| 312 | drv_sw_scan_complete(local); |
Johannes Berg | e76aadc | 2011-11-29 10:20:02 +0100 | [diff] [blame] | 313 | ieee80211_offchannel_return(local, true); |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 314 | } |
| 315 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 316 | ieee80211_recalc_idle(local); |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 317 | |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 318 | ieee80211_mlme_notify_scan_completed(local); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 319 | ieee80211_ibss_notify_scan_completed(local); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 320 | ieee80211_mesh_notify_scan_completed(local); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 321 | ieee80211_start_next_roc(local); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 322 | } |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 323 | |
| 324 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
| 325 | { |
| 326 | struct ieee80211_local *local = hw_to_local(hw); |
| 327 | |
| 328 | trace_api_scan_completed(local, aborted); |
| 329 | |
| 330 | set_bit(SCAN_COMPLETED, &local->scanning); |
| 331 | if (aborted) |
| 332 | set_bit(SCAN_ABORTED, &local->scanning); |
| 333 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); |
| 334 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 335 | EXPORT_SYMBOL(ieee80211_scan_completed); |
| 336 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 337 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
| 338 | { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 339 | /* |
| 340 | * Hardware/driver doesn't support hw_scan, so use software |
| 341 | * scanning instead. First send a nullfunc frame with power save |
| 342 | * bit on so that AP will buffer the frames for us while we are not |
| 343 | * listening, then send probe requests to each channel and wait for |
| 344 | * the responses. After all channels are scanned, tune back to the |
| 345 | * original channel and send a nullfunc frame with power save bit |
| 346 | * off to trigger the AP to send us all the buffered frames. |
| 347 | * |
| 348 | * Note that while local->sw_scanning is true everything else but |
| 349 | * nullfunc frames and probe requests will be dropped in |
| 350 | * ieee80211_tx_h_check_assoc(). |
| 351 | */ |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 352 | drv_sw_scan_start(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 353 | |
Rajkumar Manoharan | de312db | 2012-03-27 11:01:06 +0530 | [diff] [blame] | 354 | local->leave_oper_channel_time = jiffies; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 355 | local->next_scan_state = SCAN_DECISION; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 356 | local->scan_channel_idx = 0; |
| 357 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 358 | ieee80211_offchannel_stop_vifs(local, true); |
Johannes Berg | a80f7c0 | 2009-12-23 13:15:32 +0100 | [diff] [blame] | 359 | |
Johannes Berg | 3ac64be | 2009-08-17 16:16:53 +0200 | [diff] [blame] | 360 | ieee80211_configure_filter(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 361 | |
Ben Greear | 59bdf3b | 2011-02-07 13:44:38 -0800 | [diff] [blame] | 362 | /* We need to set power level at maximum rate for scanning. */ |
| 363 | ieee80211_hw_config(local, 0); |
| 364 | |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 365 | ieee80211_queue_delayed_work(&local->hw, |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 366 | &local->scan_work, 0); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 371 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
| 372 | struct ieee80211_sub_if_data *sdata) |
| 373 | { |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 374 | if (!list_empty(&local->roc_list)) |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 375 | return false; |
| 376 | |
| 377 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
| 378 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | |
| 379 | IEEE80211_STA_CONNECTION_POLL)) |
| 380 | return false; |
| 381 | |
| 382 | return true; |
| 383 | } |
| 384 | |
| 385 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) |
| 386 | { |
| 387 | lockdep_assert_held(&local->mtx); |
| 388 | |
| 389 | if (!local->scan_req || local->scanning) |
| 390 | return; |
| 391 | |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 392 | if (!ieee80211_can_scan(local, |
| 393 | rcu_dereference_protected( |
| 394 | local->scan_sdata, |
| 395 | lockdep_is_held(&local->mtx)))) |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 396 | return; |
| 397 | |
| 398 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, |
| 399 | round_jiffies_relative(0)); |
| 400 | } |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 401 | |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 402 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
| 403 | unsigned long *next_delay) |
| 404 | { |
| 405 | int i; |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 406 | struct ieee80211_sub_if_data *sdata; |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 407 | enum ieee80211_band band = local->hw.conf.channel->band; |
| 408 | |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 409 | sdata = rcu_dereference_protected(local->scan_sdata, |
| 410 | lockdep_is_held(&local->mtx));; |
| 411 | |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 412 | for (i = 0; i < local->scan_req->n_ssids; i++) |
| 413 | ieee80211_send_probe_req( |
| 414 | sdata, NULL, |
| 415 | local->scan_req->ssids[i].ssid, |
| 416 | local->scan_req->ssids[i].ssid_len, |
| 417 | local->scan_req->ie, local->scan_req->ie_len, |
| 418 | local->scan_req->rates[band], false, |
| 419 | local->scan_req->no_cck); |
| 420 | |
| 421 | /* |
| 422 | * After sending probe requests, wait for probe responses |
| 423 | * on the channel. |
| 424 | */ |
| 425 | *next_delay = IEEE80211_CHANNEL_TIME; |
| 426 | local->next_scan_state = SCAN_DECISION; |
| 427 | } |
| 428 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 429 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
| 430 | struct cfg80211_scan_request *req) |
| 431 | { |
| 432 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 433 | int rc; |
| 434 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 435 | lockdep_assert_held(&local->mtx); |
| 436 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 437 | if (local->scan_req) |
| 438 | return -EBUSY; |
| 439 | |
Stanislaw Gruszka | 133d40f | 2012-03-28 16:01:19 +0200 | [diff] [blame] | 440 | if (!ieee80211_can_scan(local, sdata)) { |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 441 | /* wait for the work to finish/time out */ |
Johannes Berg | c0ce77b | 2010-02-03 10:22:31 +0100 | [diff] [blame] | 442 | local->scan_req = req; |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 443 | rcu_assign_pointer(local->scan_sdata, sdata); |
Johannes Berg | c0ce77b | 2010-02-03 10:22:31 +0100 | [diff] [blame] | 444 | return 0; |
| 445 | } |
| 446 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 447 | if (local->ops->hw_scan) { |
| 448 | u8 *ies; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 449 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 450 | local->hw_scan_req = kmalloc( |
| 451 | sizeof(*local->hw_scan_req) + |
| 452 | req->n_channels * sizeof(req->channels[0]) + |
| 453 | 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + |
| 454 | req->ie_len, GFP_KERNEL); |
| 455 | if (!local->hw_scan_req) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 456 | return -ENOMEM; |
| 457 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 458 | local->hw_scan_req->ssids = req->ssids; |
| 459 | local->hw_scan_req->n_ssids = req->n_ssids; |
| 460 | ies = (u8 *)local->hw_scan_req + |
| 461 | sizeof(*local->hw_scan_req) + |
| 462 | req->n_channels * sizeof(req->channels[0]); |
| 463 | local->hw_scan_req->ie = ies; |
| 464 | |
| 465 | local->hw_scan_band = 0; |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 466 | |
| 467 | /* |
| 468 | * After allocating local->hw_scan_req, we must |
| 469 | * go through until ieee80211_prep_hw_scan(), so |
| 470 | * anything that might be changed here and leave |
| 471 | * this function early must not go after this |
| 472 | * allocation. |
| 473 | */ |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | local->scan_req = req; |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 477 | rcu_assign_pointer(local->scan_sdata, sdata); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 478 | |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 479 | if (local->ops->hw_scan) { |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 480 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 481 | } else if ((req->n_channels == 1) && |
| 482 | (req->channels[0]->center_freq == |
| 483 | local->hw.conf.channel->center_freq)) { |
| 484 | |
| 485 | /* If we are scanning only on the current channel, then |
| 486 | * we do not need to stop normal activities |
| 487 | */ |
| 488 | unsigned long next_delay; |
| 489 | |
| 490 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); |
| 491 | |
| 492 | ieee80211_recalc_idle(local); |
| 493 | |
| 494 | /* Notify driver scan is starting, keep order of operations |
| 495 | * same as normal software scan, in case that matters. */ |
| 496 | drv_sw_scan_start(local); |
| 497 | |
| 498 | ieee80211_configure_filter(local); /* accept probe-responses */ |
| 499 | |
| 500 | /* We need to ensure power level is at max for scanning. */ |
| 501 | ieee80211_hw_config(local, 0); |
| 502 | |
| 503 | if ((req->channels[0]->flags & |
| 504 | IEEE80211_CHAN_PASSIVE_SCAN) || |
| 505 | !local->scan_req->n_ssids) { |
| 506 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
| 507 | } else { |
| 508 | ieee80211_scan_state_send_probe(local, &next_delay); |
| 509 | next_delay = IEEE80211_CHANNEL_TIME; |
| 510 | } |
| 511 | |
| 512 | /* Now, just wait a bit and we are all done! */ |
| 513 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, |
| 514 | next_delay); |
| 515 | return 0; |
| 516 | } else { |
| 517 | /* Do normal software scan */ |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 518 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 519 | } |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 520 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 521 | ieee80211_recalc_idle(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 522 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 523 | if (local->ops->hw_scan) { |
| 524 | WARN_ON(!ieee80211_prep_hw_scan(local)); |
Johannes Berg | a060bbf | 2010-04-27 11:59:34 +0200 | [diff] [blame] | 525 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 526 | } else |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 527 | rc = ieee80211_start_sw_scan(local); |
| 528 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 529 | if (rc) { |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 530 | kfree(local->hw_scan_req); |
| 531 | local->hw_scan_req = NULL; |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 532 | local->scanning = 0; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 533 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 534 | ieee80211_recalc_idle(local); |
| 535 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 536 | local->scan_req = NULL; |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 537 | rcu_assign_pointer(local->scan_sdata, NULL); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | return rc; |
| 541 | } |
| 542 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 543 | static unsigned long |
| 544 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) |
| 545 | { |
| 546 | /* |
| 547 | * TODO: channel switching also consumes quite some time, |
| 548 | * add that delay as well to get a better estimation |
| 549 | */ |
| 550 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) |
| 551 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
| 552 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; |
| 553 | } |
| 554 | |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 555 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
| 556 | unsigned long *next_delay) |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 557 | { |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 558 | bool associated = false; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 559 | bool tx_empty = true; |
| 560 | bool bad_latency; |
| 561 | bool listen_int_exceeded; |
| 562 | unsigned long min_beacon_int = 0; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 563 | struct ieee80211_sub_if_data *sdata; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 564 | struct ieee80211_channel *next_chan; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 565 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 566 | /* |
| 567 | * check if at least one STA interface is associated, |
| 568 | * check if at least one STA interface has pending tx frames |
| 569 | * and grab the lowest used beacon interval |
| 570 | */ |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 571 | mutex_lock(&local->iflist_mtx); |
| 572 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 573 | if (!ieee80211_sdata_running(sdata)) |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 574 | continue; |
| 575 | |
| 576 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
| 577 | if (sdata->u.mgd.associated) { |
| 578 | associated = true; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 579 | |
| 580 | if (sdata->vif.bss_conf.beacon_int < |
| 581 | min_beacon_int || min_beacon_int == 0) |
| 582 | min_beacon_int = |
| 583 | sdata->vif.bss_conf.beacon_int; |
| 584 | |
| 585 | if (!qdisc_all_tx_empty(sdata->dev)) { |
| 586 | tx_empty = false; |
| 587 | break; |
| 588 | } |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 589 | } |
| 590 | } |
| 591 | } |
| 592 | mutex_unlock(&local->iflist_mtx); |
| 593 | |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 594 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
| 595 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 596 | /* |
| 597 | * we're currently scanning a different channel, let's |
| 598 | * see if we can scan another channel without interfering |
| 599 | * with the current traffic situation. |
| 600 | * |
| 601 | * Since we don't know if the AP has pending frames for us |
| 602 | * we can only check for our tx queues and use the current |
| 603 | * pm_qos requirements for rx. Hence, if no tx traffic occurs |
| 604 | * at all we will scan as many channels in a row as the pm_qos |
| 605 | * latency allows us to. Additionally we also check for the |
| 606 | * currently negotiated listen interval to prevent losing |
| 607 | * frames unnecessarily. |
| 608 | * |
| 609 | * Otherwise switch back to the operating channel. |
| 610 | */ |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 611 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 612 | bad_latency = time_after(jiffies + |
| 613 | ieee80211_scan_get_channel_time(next_chan), |
| 614 | local->leave_oper_channel_time + |
| 615 | usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 616 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 617 | listen_int_exceeded = time_after(jiffies + |
| 618 | ieee80211_scan_get_channel_time(next_chan), |
| 619 | local->leave_oper_channel_time + |
| 620 | usecs_to_jiffies(min_beacon_int * 1024) * |
| 621 | local->hw.conf.listen_interval); |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 622 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 623 | if (associated && (!tx_empty || bad_latency || listen_int_exceeded)) |
| 624 | local->next_scan_state = SCAN_SUSPEND; |
| 625 | else |
| 626 | local->next_scan_state = SCAN_SET_CHANNEL; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 627 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 628 | *next_delay = 0; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
| 632 | unsigned long *next_delay) |
| 633 | { |
| 634 | int skip; |
| 635 | struct ieee80211_channel *chan; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 636 | |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 637 | skip = 0; |
| 638 | chan = local->scan_req->channels[local->scan_channel_idx]; |
| 639 | |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 640 | local->scan_channel = chan; |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 641 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 642 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
| 643 | skip = 1; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 644 | |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 645 | /* advance state machine to next channel/band */ |
| 646 | local->scan_channel_idx++; |
| 647 | |
Helmut Schaa | 0ee9c13 | 2009-07-25 17:25:51 +0200 | [diff] [blame] | 648 | if (skip) { |
| 649 | /* if we skip this channel return to the decision state */ |
| 650 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 651 | return; |
Helmut Schaa | 0ee9c13 | 2009-07-25 17:25:51 +0200 | [diff] [blame] | 652 | } |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 653 | |
| 654 | /* |
| 655 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 |
| 656 | * (which unfortunately doesn't say _why_ step a) is done, |
| 657 | * but it waits for the probe delay or until a frame is |
| 658 | * received - and the received frame would update the NAV). |
| 659 | * For now, we do not support waiting until a frame is |
| 660 | * received. |
| 661 | * |
| 662 | * In any case, it is not necessary for a passive scan. |
| 663 | */ |
| 664 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || |
| 665 | !local->scan_req->n_ssids) { |
| 666 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 667 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 668 | return; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 669 | } |
| 670 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 671 | /* active scan, send probes */ |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 672 | *next_delay = IEEE80211_PROBE_DELAY; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 673 | local->next_scan_state = SCAN_SEND_PROBE; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 674 | } |
| 675 | |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 676 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
| 677 | unsigned long *next_delay) |
| 678 | { |
| 679 | /* switch back to the operating channel */ |
| 680 | local->scan_channel = NULL; |
| 681 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
| 682 | |
| 683 | /* |
| 684 | * Re-enable vifs and beaconing. Leave PS |
| 685 | * in off-channel state..will put that back |
| 686 | * on-channel at the end of scanning. |
| 687 | */ |
Johannes Berg | e76aadc | 2011-11-29 10:20:02 +0100 | [diff] [blame] | 688 | ieee80211_offchannel_return(local, false); |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 689 | |
| 690 | *next_delay = HZ / 5; |
| 691 | /* afterwards, resume scan & go to next channel */ |
| 692 | local->next_scan_state = SCAN_RESUME; |
| 693 | } |
| 694 | |
| 695 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, |
| 696 | unsigned long *next_delay) |
| 697 | { |
| 698 | /* PS already is in off-channel mode */ |
| 699 | ieee80211_offchannel_stop_vifs(local, false); |
| 700 | |
| 701 | if (local->ops->flush) { |
| 702 | drv_flush(local, false); |
| 703 | *next_delay = 0; |
| 704 | } else |
| 705 | *next_delay = HZ / 10; |
| 706 | |
| 707 | /* remember when we left the operating channel */ |
| 708 | local->leave_oper_channel_time = jiffies; |
| 709 | |
| 710 | /* advance to the next channel to be scanned */ |
Mohammed Shafi Shajakhan | de2ee84 | 2011-12-24 18:43:28 +0530 | [diff] [blame] | 711 | local->next_scan_state = SCAN_SET_CHANNEL; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 712 | } |
| 713 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 714 | void ieee80211_scan_work(struct work_struct *work) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 715 | { |
| 716 | struct ieee80211_local *local = |
| 717 | container_of(work, struct ieee80211_local, scan_work.work); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 718 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 719 | unsigned long next_delay = 0; |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 720 | bool aborted, hw_scan; |
Johannes Berg | 8789d45 | 2010-08-26 13:30:26 +0200 | [diff] [blame] | 721 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 722 | mutex_lock(&local->mtx); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 723 | |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 724 | sdata = rcu_dereference_protected(local->scan_sdata, |
| 725 | lockdep_is_held(&local->mtx)); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 726 | |
Ben Greear | 8a69067 | 2012-04-17 10:54:16 -0700 | [diff] [blame] | 727 | /* When scanning on-channel, the first-callback means completed. */ |
| 728 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { |
| 729 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
| 730 | goto out_complete; |
| 731 | } |
| 732 | |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 733 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
| 734 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
| 735 | goto out_complete; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 736 | } |
| 737 | |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 738 | if (!sdata || !local->scan_req) |
| 739 | goto out; |
| 740 | |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 741 | if (local->scan_req && !local->scanning) { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 742 | struct cfg80211_scan_request *req = local->scan_req; |
| 743 | int rc; |
| 744 | |
| 745 | local->scan_req = NULL; |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 746 | rcu_assign_pointer(local->scan_sdata, NULL); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 747 | |
| 748 | rc = __ieee80211_start_scan(sdata, req); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 749 | if (rc) { |
Stanislaw Gruszka | 3aed49e | 2010-10-06 11:22:12 +0200 | [diff] [blame] | 750 | /* need to complete scan in cfg80211 */ |
| 751 | local->scan_req = req; |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 752 | aborted = true; |
| 753 | goto out_complete; |
| 754 | } else |
| 755 | goto out; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 756 | } |
| 757 | |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 758 | /* |
| 759 | * Avoid re-scheduling when the sdata is going away. |
| 760 | */ |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 761 | if (!ieee80211_sdata_running(sdata)) { |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 762 | aborted = true; |
| 763 | goto out_complete; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 764 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 765 | |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 766 | /* |
| 767 | * as long as no delay is required advance immediately |
| 768 | * without scheduling a new work |
| 769 | */ |
| 770 | do { |
Rajkumar Manoharan | c29acf2 | 2011-05-14 09:43:28 +0530 | [diff] [blame] | 771 | if (!ieee80211_sdata_running(sdata)) { |
| 772 | aborted = true; |
| 773 | goto out_complete; |
| 774 | } |
| 775 | |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 776 | switch (local->next_scan_state) { |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 777 | case SCAN_DECISION: |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 778 | /* if no more bands/channels left, complete scan */ |
| 779 | if (local->scan_channel_idx >= local->scan_req->n_channels) { |
| 780 | aborted = false; |
| 781 | goto out_complete; |
| 782 | } |
| 783 | ieee80211_scan_state_decision(local, &next_delay); |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 784 | break; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 785 | case SCAN_SET_CHANNEL: |
| 786 | ieee80211_scan_state_set_channel(local, &next_delay); |
| 787 | break; |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 788 | case SCAN_SEND_PROBE: |
| 789 | ieee80211_scan_state_send_probe(local, &next_delay); |
| 790 | break; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 791 | case SCAN_SUSPEND: |
| 792 | ieee80211_scan_state_suspend(local, &next_delay); |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 793 | break; |
Johannes Berg | 07ef03e | 2011-11-08 16:21:21 +0100 | [diff] [blame] | 794 | case SCAN_RESUME: |
| 795 | ieee80211_scan_state_resume(local, &next_delay); |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 796 | break; |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 797 | } |
| 798 | } while (next_delay == 0); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 799 | |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 800 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 801 | goto out; |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 802 | |
| 803 | out_complete: |
Stanislaw Gruszka | e229f84 | 2010-10-06 11:22:09 +0200 | [diff] [blame] | 804 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 805 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
Stanislaw Gruszka | 259b62e | 2010-10-06 11:22:08 +0200 | [diff] [blame] | 806 | out: |
| 807 | mutex_unlock(&local->mtx); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 808 | } |
| 809 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 810 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 811 | struct cfg80211_scan_request *req) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 812 | { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 813 | int res; |
| 814 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 815 | mutex_lock(&sdata->local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 816 | res = __ieee80211_start_scan(sdata, req); |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 817 | mutex_unlock(&sdata->local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 818 | |
| 819 | return res; |
| 820 | } |
| 821 | |
| 822 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 823 | const u8 *ssid, u8 ssid_len, |
| 824 | struct ieee80211_channel *chan) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 825 | { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 826 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 827 | int ret = -EBUSY; |
Gertjan van Wingerde | fb63bc4 | 2010-06-20 20:28:07 +0200 | [diff] [blame] | 828 | enum ieee80211_band band; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 829 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 830 | mutex_lock(&local->mtx); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 831 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 832 | /* busy scanning */ |
| 833 | if (local->scan_req) |
| 834 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 835 | |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 836 | /* fill internal scan request */ |
| 837 | if (!chan) { |
| 838 | int i, nchan = 0; |
| 839 | |
| 840 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| 841 | if (!local->hw.wiphy->bands[band]) |
| 842 | continue; |
| 843 | for (i = 0; |
| 844 | i < local->hw.wiphy->bands[band]->n_channels; |
| 845 | i++) { |
| 846 | local->int_scan_req->channels[nchan] = |
| 847 | &local->hw.wiphy->bands[band]->channels[i]; |
| 848 | nchan++; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | local->int_scan_req->n_channels = nchan; |
| 853 | } else { |
| 854 | local->int_scan_req->channels[0] = chan; |
| 855 | local->int_scan_req->n_channels = 1; |
| 856 | } |
| 857 | |
| 858 | local->int_scan_req->ssids = &local->scan_ssid; |
| 859 | local->int_scan_req->n_ssids = 1; |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 860 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
| 861 | local->int_scan_req->ssids[0].ssid_len = ssid_len; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 862 | |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 863 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 864 | unlock: |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 865 | mutex_unlock(&local->mtx); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 866 | return ret; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 867 | } |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 868 | |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 869 | /* |
| 870 | * Only call this function when a scan can't be queued -- under RTNL. |
| 871 | */ |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 872 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
| 873 | { |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 874 | /* |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 875 | * We are canceling software scan, or deferred scan that was not |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 876 | * yet really started (see __ieee80211_start_scan ). |
| 877 | * |
| 878 | * Regarding hardware scan: |
| 879 | * - we can not call __ieee80211_scan_completed() as when |
| 880 | * SCAN_HW_SCANNING bit is set this function change |
| 881 | * local->hw_scan_req to operate on 5G band, what race with |
| 882 | * driver which can use local->hw_scan_req |
| 883 | * |
| 884 | * - we can not cancel scan_work since driver can schedule it |
| 885 | * by ieee80211_scan_completed(..., true) to finish scan |
| 886 | * |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 887 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
| 888 | * driver is still responsible for calling ieee80211_scan_completed() |
| 889 | * after the scan was completed/aborted. |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 890 | */ |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 891 | |
Johannes Berg | a1699b7 | 2010-07-30 16:46:07 +0200 | [diff] [blame] | 892 | mutex_lock(&local->mtx); |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 893 | if (!local->scan_req) |
| 894 | goto out; |
| 895 | |
| 896 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
| 897 | if (local->ops->cancel_hw_scan) |
Johannes Berg | e2fd5db | 2012-07-06 21:39:28 +0200 | [diff] [blame] | 898 | drv_cancel_hw_scan(local, |
| 899 | rcu_dereference_protected(local->scan_sdata, |
| 900 | lockdep_is_held(&local->mtx))); |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 901 | goto out; |
Stanislaw Gruszka | 4136c42 | 2010-10-06 11:22:10 +0200 | [diff] [blame] | 902 | } |
Eliad Peller | b856439 | 2011-06-13 12:47:30 +0300 | [diff] [blame] | 903 | |
| 904 | /* |
| 905 | * If the work is currently running, it must be blocked on |
| 906 | * the mutex, but we'll set scan_sdata = NULL and it'll |
| 907 | * simply exit once it acquires the mutex. |
| 908 | */ |
| 909 | cancel_delayed_work(&local->scan_work); |
| 910 | /* and clean up */ |
| 911 | __ieee80211_scan_completed(&local->hw, true, false); |
| 912 | out: |
Johannes Berg | d07bfd8 | 2011-03-07 15:48:41 +0100 | [diff] [blame] | 913 | mutex_unlock(&local->mtx); |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 914 | } |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 915 | |
| 916 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
| 917 | struct cfg80211_sched_scan_request *req) |
| 918 | { |
| 919 | struct ieee80211_local *local = sdata->local; |
| 920 | int ret, i; |
| 921 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 922 | mutex_lock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 923 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 924 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 925 | ret = -EBUSY; |
| 926 | goto out; |
| 927 | } |
| 928 | |
| 929 | if (!local->ops->sched_scan_start) { |
| 930 | ret = -ENOTSUPP; |
| 931 | goto out; |
| 932 | } |
| 933 | |
| 934 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { |
Arik Nemtsov | d811b3d | 2012-07-09 19:57:28 +0300 | [diff] [blame] | 935 | if (!local->hw.wiphy->bands[i]) |
| 936 | continue; |
| 937 | |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 938 | local->sched_scan_ies.ie[i] = kzalloc(2 + |
| 939 | IEEE80211_MAX_SSID_LEN + |
Luciano Coelho | 1186980 | 2011-07-07 15:18:27 +0300 | [diff] [blame] | 940 | local->scan_ies_len + |
| 941 | req->ie_len, |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 942 | GFP_KERNEL); |
| 943 | if (!local->sched_scan_ies.ie[i]) { |
| 944 | ret = -ENOMEM; |
| 945 | goto out_free; |
| 946 | } |
| 947 | |
| 948 | local->sched_scan_ies.len[i] = |
| 949 | ieee80211_build_preq_ies(local, |
| 950 | local->sched_scan_ies.ie[i], |
| 951 | req->ie, req->ie_len, i, |
| 952 | (u32) -1, 0); |
| 953 | } |
| 954 | |
| 955 | ret = drv_sched_scan_start(local, sdata, req, |
| 956 | &local->sched_scan_ies); |
| 957 | if (ret == 0) { |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 958 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 959 | goto out; |
| 960 | } |
| 961 | |
| 962 | out_free: |
| 963 | while (i > 0) |
| 964 | kfree(local->sched_scan_ies.ie[--i]); |
| 965 | out: |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 966 | mutex_unlock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 967 | return ret; |
| 968 | } |
| 969 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 970 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 971 | { |
| 972 | struct ieee80211_local *local = sdata->local; |
| 973 | int ret = 0, i; |
| 974 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 975 | mutex_lock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 976 | |
| 977 | if (!local->ops->sched_scan_stop) { |
| 978 | ret = -ENOTSUPP; |
| 979 | goto out; |
| 980 | } |
| 981 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 982 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 983 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
| 984 | kfree(local->sched_scan_ies.ie[i]); |
| 985 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 986 | drv_sched_scan_stop(local, sdata); |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 987 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 988 | } |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 989 | out: |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 990 | mutex_unlock(&local->mtx); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 991 | |
| 992 | return ret; |
| 993 | } |
| 994 | |
| 995 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) |
| 996 | { |
| 997 | struct ieee80211_local *local = hw_to_local(hw); |
| 998 | |
| 999 | trace_api_sched_scan_results(local); |
| 1000 | |
| 1001 | cfg80211_sched_scan_results(hw->wiphy); |
| 1002 | } |
| 1003 | EXPORT_SYMBOL(ieee80211_sched_scan_results); |
| 1004 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1005 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
| 1006 | { |
| 1007 | struct ieee80211_local *local = |
| 1008 | container_of(work, struct ieee80211_local, |
| 1009 | sched_scan_stopped_work); |
| 1010 | int i; |
| 1011 | |
| 1012 | mutex_lock(&local->mtx); |
| 1013 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1014 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1015 | mutex_unlock(&local->mtx); |
| 1016 | return; |
| 1017 | } |
| 1018 | |
| 1019 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
| 1020 | kfree(local->sched_scan_ies.ie[i]); |
| 1021 | |
Johannes Berg | 5260a5b | 2012-07-06 21:55:11 +0200 | [diff] [blame] | 1022 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1023 | |
| 1024 | mutex_unlock(&local->mtx); |
| 1025 | |
| 1026 | cfg80211_sched_scan_stopped(local->hw.wiphy); |
| 1027 | } |
| 1028 | |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1029 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
| 1030 | { |
| 1031 | struct ieee80211_local *local = hw_to_local(hw); |
| 1032 | |
| 1033 | trace_api_sched_scan_stopped(local); |
| 1034 | |
Luciano Coelho | 85a9994 | 2011-05-12 16:28:29 +0300 | [diff] [blame] | 1035 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
Luciano Coelho | 79f460c | 2011-05-11 17:09:36 +0300 | [diff] [blame] | 1036 | } |
| 1037 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |