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> |
Johannes Berg | 078e1e6 | 2009-01-22 18:07:31 +0100 | [diff] [blame] | 16 | #include <linux/rtnetlink.h> |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 17 | #include <linux/pm_qos_params.h> |
| 18 | #include <net/sch_generic.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 20 | #include <net/mac80211.h> |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 21 | |
| 22 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 23 | #include "driver-ops.h" |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 24 | #include "mesh.h" |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 25 | |
| 26 | #define IEEE80211_PROBE_DELAY (HZ / 33) |
| 27 | #define IEEE80211_CHANNEL_TIME (HZ / 33) |
Helmut Schaa | 96f7e73 | 2009-06-30 14:49:18 +0200 | [diff] [blame] | 28 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 29 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 30 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 31 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
| 32 | u8 *ssid, u8 ssid_len) |
| 33 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 34 | struct cfg80211_bss *cbss; |
| 35 | |
| 36 | cbss = cfg80211_get_bss(local->hw.wiphy, |
| 37 | ieee80211_get_channel(local->hw.wiphy, freq), |
| 38 | bssid, ssid, ssid_len, 0, 0); |
| 39 | if (!cbss) |
| 40 | return NULL; |
| 41 | return (void *)cbss->priv; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 42 | } |
| 43 | |
Johannes Berg | 00d3f14 | 2009-02-10 21:26:00 +0100 | [diff] [blame] | 44 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 45 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 46 | struct ieee80211_bss *bss = (void *)cbss->priv; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 47 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 48 | kfree(bss_mesh_id(bss)); |
| 49 | kfree(bss_mesh_cfg(bss)); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 53 | struct ieee80211_bss *bss) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 54 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 55 | if (!bss) |
| 56 | return; |
| 57 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 58 | } |
| 59 | |
Kalle Valo | ab13315 | 2010-01-12 10:42:31 +0200 | [diff] [blame] | 60 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
| 61 | { |
| 62 | u8 qos_info; |
| 63 | |
| 64 | if (elems->wmm_info && elems->wmm_info_len == 7 |
| 65 | && elems->wmm_info[5] == 1) |
| 66 | qos_info = elems->wmm_info[6]; |
| 67 | else if (elems->wmm_param && elems->wmm_param_len == 24 |
| 68 | && elems->wmm_param[5] == 1) |
| 69 | qos_info = elems->wmm_param[6]; |
| 70 | else |
| 71 | /* no valid wmm information or parameter element found */ |
| 72 | return false; |
| 73 | |
| 74 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; |
| 75 | } |
| 76 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 77 | struct ieee80211_bss * |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 78 | ieee80211_bss_info_update(struct ieee80211_local *local, |
| 79 | struct ieee80211_rx_status *rx_status, |
| 80 | struct ieee80211_mgmt *mgmt, |
| 81 | size_t len, |
| 82 | struct ieee802_11_elems *elems, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 83 | struct ieee80211_channel *channel, |
| 84 | bool beacon) |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 85 | { |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 86 | struct cfg80211_bss *cbss; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 87 | struct ieee80211_bss *bss; |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 88 | int clen, srlen; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 89 | s32 signal = 0; |
| 90 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 91 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 92 | signal = rx_status->signal * 100; |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 93 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 94 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 95 | |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 96 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
| 97 | mgmt, len, signal, GFP_ATOMIC); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 98 | |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 99 | if (!cbss) |
Johannes Berg | 00d3f14 | 2009-02-10 21:26:00 +0100 | [diff] [blame] | 100 | return NULL; |
| 101 | |
Johannes Berg | 0c1ad2c | 2009-12-23 13:15:39 +0100 | [diff] [blame] | 102 | cbss->free_priv = ieee80211_rx_bss_free; |
| 103 | bss = (void *)cbss->priv; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 104 | |
| 105 | /* save the ERP value so that it is available at association time */ |
| 106 | if (elems->erp_info && elems->erp_info_len >= 1) { |
| 107 | bss->erp_value = elems->erp_info[0]; |
| 108 | bss->has_erp_value = 1; |
| 109 | } |
| 110 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 111 | if (elems->tim) { |
| 112 | struct ieee80211_tim_ie *tim_ie = |
| 113 | (struct ieee80211_tim_ie *)elems->tim; |
| 114 | bss->dtim_period = tim_ie->dtim_period; |
| 115 | } |
| 116 | |
Johannes Berg | e5b900d | 2010-07-29 16:08:55 +0200 | [diff] [blame] | 117 | /* If the beacon had no TIM IE, or it was invalid, use 1 */ |
| 118 | if (beacon && !bss->dtim_period) |
| 119 | bss->dtim_period = 1; |
| 120 | |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 121 | /* replace old supported rates if we get new values */ |
| 122 | srlen = 0; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 123 | if (elems->supp_rates) { |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 124 | clen = IEEE80211_MAX_SUPP_RATES; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 125 | if (clen > elems->supp_rates_len) |
| 126 | clen = elems->supp_rates_len; |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 127 | memcpy(bss->supp_rates, elems->supp_rates, clen); |
| 128 | srlen += clen; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 129 | } |
| 130 | if (elems->ext_supp_rates) { |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 131 | clen = IEEE80211_MAX_SUPP_RATES - srlen; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 132 | if (clen > elems->ext_supp_rates_len) |
| 133 | clen = elems->ext_supp_rates_len; |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 134 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen); |
| 135 | srlen += clen; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 136 | } |
Stanislaw Gruszka | f0b058b | 2010-04-28 15:17:03 +0200 | [diff] [blame] | 137 | if (srlen) |
| 138 | bss->supp_rates_len = srlen; |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 139 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 140 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
Kalle Valo | ab13315 | 2010-01-12 10:42:31 +0200 | [diff] [blame] | 141 | bss->uapsd_supported = is_uapsd_supported(elems); |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 142 | |
| 143 | if (!beacon) |
| 144 | bss->last_probe_resp = jiffies; |
| 145 | |
Johannes Berg | 5484e23 | 2008-09-08 17:44:27 +0200 | [diff] [blame] | 146 | return bss; |
| 147 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 148 | |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 149 | ieee80211_rx_result |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 150 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 151 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 152 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 153 | struct ieee80211_mgmt *mgmt; |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 154 | struct ieee80211_bss *bss; |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 155 | u8 *elements; |
| 156 | struct ieee80211_channel *channel; |
| 157 | size_t baselen; |
| 158 | int freq; |
| 159 | __le16 fc; |
| 160 | bool presp, beacon = false; |
| 161 | struct ieee802_11_elems elems; |
| 162 | |
| 163 | if (skb->len < 2) |
| 164 | return RX_DROP_UNUSABLE; |
| 165 | |
| 166 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 167 | fc = mgmt->frame_control; |
| 168 | |
| 169 | if (ieee80211_is_ctl(fc)) |
| 170 | return RX_CONTINUE; |
| 171 | |
| 172 | if (skb->len < 24) |
| 173 | return RX_DROP_MONITOR; |
| 174 | |
| 175 | presp = ieee80211_is_probe_resp(fc); |
| 176 | if (presp) { |
| 177 | /* ignore ProbeResp to foreign address */ |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 178 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 179 | return RX_DROP_MONITOR; |
| 180 | |
| 181 | presp = true; |
| 182 | elements = mgmt->u.probe_resp.variable; |
| 183 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); |
| 184 | } else { |
| 185 | beacon = ieee80211_is_beacon(fc); |
| 186 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
| 187 | elements = mgmt->u.beacon.variable; |
| 188 | } |
| 189 | |
| 190 | if (!presp && !beacon) |
| 191 | return RX_CONTINUE; |
| 192 | |
| 193 | if (baselen > skb->len) |
| 194 | return RX_DROP_MONITOR; |
| 195 | |
| 196 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); |
| 197 | |
| 198 | if (elems.ds_params && elems.ds_params_len == 1) |
| 199 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); |
| 200 | else |
| 201 | freq = rx_status->freq; |
| 202 | |
| 203 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); |
| 204 | |
| 205 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
| 206 | return RX_DROP_MONITOR; |
| 207 | |
| 208 | bss = ieee80211_bss_info_update(sdata->local, rx_status, |
| 209 | mgmt, skb->len, &elems, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 210 | channel, beacon); |
Jouni Malinen | d048e50 | 2008-10-11 03:29:55 +0300 | [diff] [blame] | 211 | if (bss) |
| 212 | ieee80211_rx_bss_put(sdata->local, bss); |
Johannes Berg | 98c8fcc | 2008-09-08 17:44:26 +0200 | [diff] [blame] | 213 | |
| 214 | dev_kfree_skb(skb); |
| 215 | return RX_QUEUED; |
| 216 | } |
| 217 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 218 | /* return false if no more work */ |
| 219 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) |
| 220 | { |
| 221 | struct cfg80211_scan_request *req = local->scan_req; |
| 222 | enum ieee80211_band band; |
| 223 | int i, ielen, n_chans; |
| 224 | |
| 225 | do { |
| 226 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) |
| 227 | return false; |
| 228 | |
| 229 | band = local->hw_scan_band; |
| 230 | n_chans = 0; |
| 231 | for (i = 0; i < req->n_channels; i++) { |
| 232 | if (req->channels[i]->band == band) { |
| 233 | local->hw_scan_req->channels[n_chans] = |
| 234 | req->channels[i]; |
| 235 | n_chans++; |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | local->hw_scan_band++; |
| 240 | } while (!n_chans); |
| 241 | |
| 242 | local->hw_scan_req->n_channels = n_chans; |
| 243 | |
| 244 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, |
| 245 | req->ie, req->ie_len, band); |
| 246 | local->hw_scan_req->ie_len = ielen; |
| 247 | |
| 248 | return true; |
| 249 | } |
| 250 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 251 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 252 | { |
| 253 | struct ieee80211_local *local = hw_to_local(hw); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 254 | bool was_hw_scan; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 255 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 256 | trace_api_scan_completed(local, aborted); |
| 257 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 258 | mutex_lock(&local->scan_mtx); |
| 259 | |
Johannes Berg | 6d3560d | 2009-10-31 07:44:08 +0100 | [diff] [blame] | 260 | /* |
| 261 | * It's ok to abort a not-yet-running scan (that |
| 262 | * we have one at all will be verified by checking |
| 263 | * local->scan_req next), but not to complete it |
| 264 | * successfully. |
| 265 | */ |
| 266 | if (WARN_ON(!local->scanning && !aborted)) |
| 267 | aborted = true; |
Johannes Berg | de95a54 | 2009-04-01 11:58:36 +0200 | [diff] [blame] | 268 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 269 | if (WARN_ON(!local->scan_req)) { |
| 270 | mutex_unlock(&local->scan_mtx); |
| 271 | return; |
| 272 | } |
| 273 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 274 | was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
| 275 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
| 276 | ieee80211_queue_delayed_work(&local->hw, |
| 277 | &local->scan_work, 0); |
| 278 | mutex_unlock(&local->scan_mtx); |
| 279 | return; |
| 280 | } |
| 281 | |
| 282 | kfree(local->hw_scan_req); |
| 283 | local->hw_scan_req = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 284 | |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 285 | if (local->scan_req != local->int_scan_req) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 286 | cfg80211_scan_done(local->scan_req, aborted); |
| 287 | local->scan_req = NULL; |
Johannes Berg | 15db0b7 | 2009-08-25 16:33:47 +0200 | [diff] [blame] | 288 | local->scan_sdata = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 289 | |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 290 | local->scanning = 0; |
Johannes Berg | 58905ca | 2009-05-07 14:23:01 +0200 | [diff] [blame] | 291 | local->scan_channel = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 292 | |
| 293 | /* we only have to protect scan_req and hw/sw scan */ |
| 294 | mutex_unlock(&local->scan_mtx); |
| 295 | |
Johannes Berg | e897558 | 2008-10-09 12:18:51 +0200 | [diff] [blame] | 296 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 297 | if (was_hw_scan) |
| 298 | goto done; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 299 | |
Johannes Berg | 3ac64be | 2009-08-17 16:16:53 +0200 | [diff] [blame] | 300 | ieee80211_configure_filter(local); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 301 | |
Luis R. Rodriguez | a0daa0e | 2010-07-27 16:33:08 -0400 | [diff] [blame] | 302 | drv_sw_scan_complete(local); |
| 303 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 304 | ieee80211_offchannel_return(local, true); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 305 | |
| 306 | done: |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 307 | ieee80211_recalc_idle(local); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 308 | ieee80211_mlme_notify_scan_completed(local); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 309 | ieee80211_ibss_notify_scan_completed(local); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 310 | ieee80211_mesh_notify_scan_completed(local); |
Johannes Berg | 81ac346 | 2010-01-06 15:30:58 +0100 | [diff] [blame] | 311 | ieee80211_queue_work(&local->hw, &local->work_work); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 312 | } |
| 313 | EXPORT_SYMBOL(ieee80211_scan_completed); |
| 314 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 315 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
| 316 | { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 317 | /* |
| 318 | * Hardware/driver doesn't support hw_scan, so use software |
| 319 | * scanning instead. First send a nullfunc frame with power save |
| 320 | * bit on so that AP will buffer the frames for us while we are not |
| 321 | * listening, then send probe requests to each channel and wait for |
| 322 | * the responses. After all channels are scanned, tune back to the |
| 323 | * original channel and send a nullfunc frame with power save bit |
| 324 | * off to trigger the AP to send us all the buffered frames. |
| 325 | * |
| 326 | * Note that while local->sw_scanning is true everything else but |
| 327 | * nullfunc frames and probe requests will be dropped in |
| 328 | * ieee80211_tx_h_check_assoc(). |
| 329 | */ |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 330 | drv_sw_scan_start(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 331 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 332 | ieee80211_offchannel_stop_beaconing(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 333 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 334 | local->leave_oper_channel_time = 0; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 335 | local->next_scan_state = SCAN_DECISION; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 336 | local->scan_channel_idx = 0; |
| 337 | |
Johannes Berg | a80f7c0 | 2009-12-23 13:15:32 +0100 | [diff] [blame] | 338 | drv_flush(local, false); |
| 339 | |
Johannes Berg | 3ac64be | 2009-08-17 16:16:53 +0200 | [diff] [blame] | 340 | ieee80211_configure_filter(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 341 | |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 342 | ieee80211_queue_delayed_work(&local->hw, |
| 343 | &local->scan_work, |
| 344 | IEEE80211_CHANNEL_TIME); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | |
| 350 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
| 351 | struct cfg80211_scan_request *req) |
| 352 | { |
| 353 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 354 | int rc; |
| 355 | |
| 356 | if (local->scan_req) |
| 357 | return -EBUSY; |
| 358 | |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 359 | if (!list_empty(&local->work_list)) { |
| 360 | /* wait for the work to finish/time out */ |
Johannes Berg | c0ce77b | 2010-02-03 10:22:31 +0100 | [diff] [blame] | 361 | local->scan_req = req; |
| 362 | local->scan_sdata = sdata; |
| 363 | return 0; |
| 364 | } |
| 365 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 366 | if (local->ops->hw_scan) { |
| 367 | u8 *ies; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 368 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 369 | local->hw_scan_req = kmalloc( |
| 370 | sizeof(*local->hw_scan_req) + |
| 371 | req->n_channels * sizeof(req->channels[0]) + |
| 372 | 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + |
| 373 | req->ie_len, GFP_KERNEL); |
| 374 | if (!local->hw_scan_req) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 375 | return -ENOMEM; |
| 376 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 377 | local->hw_scan_req->ssids = req->ssids; |
| 378 | local->hw_scan_req->n_ssids = req->n_ssids; |
| 379 | ies = (u8 *)local->hw_scan_req + |
| 380 | sizeof(*local->hw_scan_req) + |
| 381 | req->n_channels * sizeof(req->channels[0]); |
| 382 | local->hw_scan_req->ie = ies; |
| 383 | |
| 384 | local->hw_scan_band = 0; |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 385 | |
| 386 | /* |
| 387 | * After allocating local->hw_scan_req, we must |
| 388 | * go through until ieee80211_prep_hw_scan(), so |
| 389 | * anything that might be changed here and leave |
| 390 | * this function early must not go after this |
| 391 | * allocation. |
| 392 | */ |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 393 | } |
| 394 | |
| 395 | local->scan_req = req; |
| 396 | local->scan_sdata = sdata; |
| 397 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 398 | if (local->ops->hw_scan) |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 399 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 400 | else |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 401 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 402 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 403 | /* |
| 404 | * Kicking off the scan need not be protected, |
| 405 | * only the scan variable stuff, since now |
| 406 | * local->scan_req is assigned and other callers |
| 407 | * will abort their scan attempts. |
| 408 | * |
John W. Linville | 6e7e621 | 2010-02-08 16:38:38 -0500 | [diff] [blame] | 409 | * This avoids too many locking dependencies |
| 410 | * so that the scan completed calls have more |
| 411 | * locking freedom. |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 412 | */ |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 413 | |
| 414 | ieee80211_recalc_idle(local); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 415 | mutex_unlock(&local->scan_mtx); |
| 416 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 417 | if (local->ops->hw_scan) { |
| 418 | WARN_ON(!ieee80211_prep_hw_scan(local)); |
Johannes Berg | a060bbf | 2010-04-27 11:59:34 +0200 | [diff] [blame] | 419 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 420 | } else |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 421 | rc = ieee80211_start_sw_scan(local); |
| 422 | |
| 423 | mutex_lock(&local->scan_mtx); |
| 424 | |
| 425 | if (rc) { |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 426 | kfree(local->hw_scan_req); |
| 427 | local->hw_scan_req = NULL; |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 428 | local->scanning = 0; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 429 | |
Johannes Berg | 5cff20e | 2009-04-29 12:26:17 +0200 | [diff] [blame] | 430 | ieee80211_recalc_idle(local); |
| 431 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 432 | local->scan_req = NULL; |
| 433 | local->scan_sdata = NULL; |
| 434 | } |
| 435 | |
| 436 | return rc; |
| 437 | } |
| 438 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 439 | static unsigned long |
| 440 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) |
| 441 | { |
| 442 | /* |
| 443 | * TODO: channel switching also consumes quite some time, |
| 444 | * add that delay as well to get a better estimation |
| 445 | */ |
| 446 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) |
| 447 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
| 448 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; |
| 449 | } |
| 450 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 451 | static int ieee80211_scan_state_decision(struct ieee80211_local *local, |
| 452 | unsigned long *next_delay) |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 453 | { |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 454 | bool associated = false; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 455 | bool tx_empty = true; |
| 456 | bool bad_latency; |
| 457 | bool listen_int_exceeded; |
| 458 | unsigned long min_beacon_int = 0; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 459 | struct ieee80211_sub_if_data *sdata; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 460 | struct ieee80211_channel *next_chan; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 461 | |
| 462 | /* if no more bands/channels left, complete scan and advance to the idle state */ |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 463 | if (local->scan_channel_idx >= local->scan_req->n_channels) { |
| 464 | ieee80211_scan_completed(&local->hw, false); |
| 465 | return 1; |
| 466 | } |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 467 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 468 | /* |
| 469 | * check if at least one STA interface is associated, |
| 470 | * check if at least one STA interface has pending tx frames |
| 471 | * and grab the lowest used beacon interval |
| 472 | */ |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 473 | mutex_lock(&local->iflist_mtx); |
| 474 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 475 | if (!ieee80211_sdata_running(sdata)) |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 476 | continue; |
| 477 | |
| 478 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
| 479 | if (sdata->u.mgd.associated) { |
| 480 | associated = true; |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 481 | |
| 482 | if (sdata->vif.bss_conf.beacon_int < |
| 483 | min_beacon_int || min_beacon_int == 0) |
| 484 | min_beacon_int = |
| 485 | sdata->vif.bss_conf.beacon_int; |
| 486 | |
| 487 | if (!qdisc_all_tx_empty(sdata->dev)) { |
| 488 | tx_empty = false; |
| 489 | break; |
| 490 | } |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 491 | } |
| 492 | } |
| 493 | } |
| 494 | mutex_unlock(&local->iflist_mtx); |
| 495 | |
| 496 | if (local->scan_channel) { |
| 497 | /* |
| 498 | * we're currently scanning a different channel, let's |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 499 | * see if we can scan another channel without interfering |
| 500 | * with the current traffic situation. |
| 501 | * |
| 502 | * Since we don't know if the AP has pending frames for us |
| 503 | * we can only check for our tx queues and use the current |
| 504 | * pm_qos requirements for rx. Hence, if no tx traffic occurs |
| 505 | * at all we will scan as many channels in a row as the pm_qos |
| 506 | * latency allows us to. Additionally we also check for the |
| 507 | * currently negotiated listen interval to prevent losing |
| 508 | * frames unnecessarily. |
| 509 | * |
| 510 | * Otherwise switch back to the operating channel. |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 511 | */ |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 512 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
| 513 | |
| 514 | bad_latency = time_after(jiffies + |
| 515 | ieee80211_scan_get_channel_time(next_chan), |
| 516 | local->leave_oper_channel_time + |
Linus Torvalds | f896546 | 2010-05-20 21:04:44 -0700 | [diff] [blame] | 517 | usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 518 | |
| 519 | listen_int_exceeded = time_after(jiffies + |
| 520 | ieee80211_scan_get_channel_time(next_chan), |
| 521 | local->leave_oper_channel_time + |
| 522 | usecs_to_jiffies(min_beacon_int * 1024) * |
| 523 | local->hw.conf.listen_interval); |
| 524 | |
| 525 | if (associated && ( !tx_empty || bad_latency || |
| 526 | listen_int_exceeded)) |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 527 | local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 528 | else |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 529 | local->next_scan_state = SCAN_SET_CHANNEL; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 530 | } else { |
| 531 | /* |
| 532 | * we're on the operating channel currently, let's |
| 533 | * leave that channel now to scan another one |
| 534 | */ |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 535 | local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 536 | } |
| 537 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 538 | *next_delay = 0; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 539 | return 0; |
| 540 | } |
| 541 | |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 542 | static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, |
| 543 | unsigned long *next_delay) |
| 544 | { |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 545 | ieee80211_offchannel_stop_station(local); |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 546 | |
| 547 | __set_bit(SCAN_OFF_CHANNEL, &local->scanning); |
| 548 | |
Johannes Berg | a80f7c0 | 2009-12-23 13:15:32 +0100 | [diff] [blame] | 549 | /* |
| 550 | * What if the nullfunc frames didn't arrive? |
| 551 | */ |
| 552 | drv_flush(local, false); |
| 553 | if (local->ops->flush) |
| 554 | *next_delay = 0; |
| 555 | else |
| 556 | *next_delay = HZ / 10; |
| 557 | |
Helmut Schaa | df13cce | 2010-02-24 14:19:21 +0100 | [diff] [blame] | 558 | /* remember when we left the operating channel */ |
| 559 | local->leave_oper_channel_time = jiffies; |
| 560 | |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 561 | /* advance to the next channel to be scanned */ |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 562 | local->next_scan_state = SCAN_SET_CHANNEL; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, |
| 566 | unsigned long *next_delay) |
| 567 | { |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 568 | /* switch back to the operating channel */ |
| 569 | local->scan_channel = NULL; |
| 570 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
| 571 | |
| 572 | /* |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 573 | * Only re-enable station mode interface now; beaconing will be |
| 574 | * re-enabled once the full scan has been completed. |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 575 | */ |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 576 | ieee80211_offchannel_return(local, false); |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 577 | |
| 578 | __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); |
| 579 | |
| 580 | *next_delay = HZ / 5; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 581 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 582 | } |
| 583 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 584 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
| 585 | unsigned long *next_delay) |
| 586 | { |
| 587 | int skip; |
| 588 | struct ieee80211_channel *chan; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 589 | |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 590 | skip = 0; |
| 591 | chan = local->scan_req->channels[local->scan_channel_idx]; |
| 592 | |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 593 | local->scan_channel = chan; |
| 594 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 595 | skip = 1; |
| 596 | |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 597 | /* advance state machine to next channel/band */ |
| 598 | local->scan_channel_idx++; |
| 599 | |
Helmut Schaa | 0ee9c13 | 2009-07-25 17:25:51 +0200 | [diff] [blame] | 600 | if (skip) { |
| 601 | /* if we skip this channel return to the decision state */ |
| 602 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 603 | return; |
Helmut Schaa | 0ee9c13 | 2009-07-25 17:25:51 +0200 | [diff] [blame] | 604 | } |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 605 | |
| 606 | /* |
| 607 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 |
| 608 | * (which unfortunately doesn't say _why_ step a) is done, |
| 609 | * but it waits for the probe delay or until a frame is |
| 610 | * received - and the received frame would update the NAV). |
| 611 | * For now, we do not support waiting until a frame is |
| 612 | * received. |
| 613 | * |
| 614 | * In any case, it is not necessary for a passive scan. |
| 615 | */ |
| 616 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || |
| 617 | !local->scan_req->n_ssids) { |
| 618 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 619 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 620 | return; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 621 | } |
| 622 | |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 623 | /* active scan, send probes */ |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 624 | *next_delay = IEEE80211_PROBE_DELAY; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 625 | local->next_scan_state = SCAN_SEND_PROBE; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
| 629 | unsigned long *next_delay) |
| 630 | { |
| 631 | int i; |
| 632 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; |
| 633 | |
| 634 | for (i = 0; i < local->scan_req->n_ssids; i++) |
| 635 | ieee80211_send_probe_req( |
| 636 | sdata, NULL, |
| 637 | local->scan_req->ssids[i].ssid, |
| 638 | local->scan_req->ssids[i].ssid_len, |
| 639 | local->scan_req->ie, local->scan_req->ie_len); |
| 640 | |
| 641 | /* |
| 642 | * After sending probe requests, wait for probe responses |
| 643 | * on the channel. |
| 644 | */ |
| 645 | *next_delay = IEEE80211_CHANNEL_TIME; |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 646 | local->next_scan_state = SCAN_DECISION; |
Helmut Schaa | 7d3be3c | 2009-07-23 12:13:41 +0200 | [diff] [blame] | 647 | } |
| 648 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 649 | void ieee80211_scan_work(struct work_struct *work) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 650 | { |
| 651 | struct ieee80211_local *local = |
| 652 | container_of(work, struct ieee80211_local, scan_work.work); |
| 653 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 654 | unsigned long next_delay = 0; |
| 655 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 656 | mutex_lock(&local->scan_mtx); |
| 657 | if (!sdata || !local->scan_req) { |
| 658 | mutex_unlock(&local->scan_mtx); |
| 659 | return; |
| 660 | } |
| 661 | |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 662 | if (local->hw_scan_req) { |
Johannes Berg | a060bbf | 2010-04-27 11:59:34 +0200 | [diff] [blame] | 663 | int rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
Johannes Berg | 4d36ec58 | 2009-10-27 20:59:55 +0100 | [diff] [blame] | 664 | mutex_unlock(&local->scan_mtx); |
| 665 | if (rc) |
| 666 | ieee80211_scan_completed(&local->hw, true); |
| 667 | return; |
| 668 | } |
| 669 | |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 670 | if (local->scan_req && !local->scanning) { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 671 | struct cfg80211_scan_request *req = local->scan_req; |
| 672 | int rc; |
| 673 | |
| 674 | local->scan_req = NULL; |
Johannes Berg | 15db0b7 | 2009-08-25 16:33:47 +0200 | [diff] [blame] | 675 | local->scan_sdata = NULL; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 676 | |
| 677 | rc = __ieee80211_start_scan(sdata, req); |
| 678 | mutex_unlock(&local->scan_mtx); |
| 679 | |
| 680 | if (rc) |
| 681 | ieee80211_scan_completed(&local->hw, true); |
| 682 | return; |
| 683 | } |
| 684 | |
| 685 | mutex_unlock(&local->scan_mtx); |
| 686 | |
Johannes Berg | 5bc7572 | 2008-09-11 00:01:51 +0200 | [diff] [blame] | 687 | /* |
| 688 | * Avoid re-scheduling when the sdata is going away. |
| 689 | */ |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 690 | if (!ieee80211_sdata_running(sdata)) { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 691 | ieee80211_scan_completed(&local->hw, true); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 692 | return; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 693 | } |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 694 | |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 695 | /* |
| 696 | * as long as no delay is required advance immediately |
| 697 | * without scheduling a new work |
| 698 | */ |
| 699 | do { |
Helmut Schaa | 977923b | 2009-07-23 12:14:20 +0200 | [diff] [blame] | 700 | switch (local->next_scan_state) { |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 701 | case SCAN_DECISION: |
| 702 | if (ieee80211_scan_state_decision(local, &next_delay)) |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 703 | return; |
| 704 | break; |
Helmut Schaa | 2fb3f02 | 2009-07-23 12:13:56 +0200 | [diff] [blame] | 705 | case SCAN_SET_CHANNEL: |
| 706 | ieee80211_scan_state_set_channel(local, &next_delay); |
| 707 | break; |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 708 | case SCAN_SEND_PROBE: |
| 709 | ieee80211_scan_state_send_probe(local, &next_delay); |
| 710 | break; |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 711 | case SCAN_LEAVE_OPER_CHANNEL: |
| 712 | ieee80211_scan_state_leave_oper_channel(local, &next_delay); |
| 713 | break; |
| 714 | case SCAN_ENTER_OPER_CHANNEL: |
| 715 | ieee80211_scan_state_enter_oper_channel(local, &next_delay); |
| 716 | break; |
Helmut Schaa | f502d09 | 2009-07-23 12:13:48 +0200 | [diff] [blame] | 717 | } |
| 718 | } while (next_delay == 0); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 719 | |
Luis R. Rodriguez | 42935ec | 2009-07-29 20:08:07 -0400 | [diff] [blame] | 720 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 721 | } |
| 722 | |
Johannes Berg | c2b1345 | 2008-09-11 00:01:55 +0200 | [diff] [blame] | 723 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 724 | struct cfg80211_scan_request *req) |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 725 | { |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 726 | int res; |
| 727 | |
| 728 | mutex_lock(&sdata->local->scan_mtx); |
| 729 | res = __ieee80211_start_scan(sdata, req); |
| 730 | mutex_unlock(&sdata->local->scan_mtx); |
| 731 | |
| 732 | return res; |
| 733 | } |
| 734 | |
| 735 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 736 | const u8 *ssid, u8 ssid_len, |
| 737 | struct ieee80211_channel *chan) |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 738 | { |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 739 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 740 | int ret = -EBUSY; |
Gertjan van Wingerde | fb63bc4 | 2010-06-20 20:28:07 +0200 | [diff] [blame] | 741 | enum ieee80211_band band; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 742 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 743 | mutex_lock(&local->scan_mtx); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 744 | |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 745 | /* busy scanning */ |
| 746 | if (local->scan_req) |
| 747 | goto unlock; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 748 | |
Johannes Berg | be4a4b6 | 2010-05-03 08:49:48 +0200 | [diff] [blame] | 749 | /* fill internal scan request */ |
| 750 | if (!chan) { |
| 751 | int i, nchan = 0; |
| 752 | |
| 753 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| 754 | if (!local->hw.wiphy->bands[band]) |
| 755 | continue; |
| 756 | for (i = 0; |
| 757 | i < local->hw.wiphy->bands[band]->n_channels; |
| 758 | i++) { |
| 759 | local->int_scan_req->channels[nchan] = |
| 760 | &local->hw.wiphy->bands[band]->channels[i]; |
| 761 | nchan++; |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | local->int_scan_req->n_channels = nchan; |
| 766 | } else { |
| 767 | local->int_scan_req->channels[0] = chan; |
| 768 | local->int_scan_req->n_channels = 1; |
| 769 | } |
| 770 | |
| 771 | local->int_scan_req->ssids = &local->scan_ssid; |
| 772 | local->int_scan_req->n_ssids = 1; |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 773 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
| 774 | local->int_scan_req->ssids[0].ssid_len = ssid_len; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 775 | |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 776 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
Johannes Berg | f3b8525 | 2009-04-23 16:01:47 +0200 | [diff] [blame] | 777 | unlock: |
| 778 | mutex_unlock(&local->scan_mtx); |
| 779 | return ret; |
Johannes Berg | 0a51b27 | 2008-09-08 17:44:25 +0200 | [diff] [blame] | 780 | } |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 781 | |
| 782 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
| 783 | { |
Johannes Berg | 15db0b7 | 2009-08-25 16:33:47 +0200 | [diff] [blame] | 784 | bool abortscan; |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 785 | |
| 786 | cancel_delayed_work_sync(&local->scan_work); |
| 787 | |
| 788 | /* |
| 789 | * Only call this function when a scan can't be |
| 790 | * queued -- mostly at suspend under RTNL. |
| 791 | */ |
| 792 | mutex_lock(&local->scan_mtx); |
Johannes Berg | 15db0b7 | 2009-08-25 16:33:47 +0200 | [diff] [blame] | 793 | abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || |
| 794 | (!local->scanning && local->scan_req); |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 795 | mutex_unlock(&local->scan_mtx); |
| 796 | |
Johannes Berg | 15db0b7 | 2009-08-25 16:33:47 +0200 | [diff] [blame] | 797 | if (abortscan) |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 798 | ieee80211_scan_completed(&local->hw, true); |
| 799 | } |