1 /* 2 * This file is part of wl12xx 3 * 4 * Copyright (C) 2012 Texas Instruments. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 18 * 02110-1301 USA 19 * 20 */ 21 22 #include <linux/ieee80211.h> 23 #include "scan.h" 24 #include "../wlcore/debug.h" 25 #include "../wlcore/tx.h" 26 27 static int wl1271_get_scan_channels(struct wl1271 *wl, 28 struct cfg80211_scan_request *req, 29 struct basic_scan_channel_params *channels, 30 enum ieee80211_band band, bool passive) 31 { 32 struct conf_scan_settings *c = &wl->conf.scan; 33 int i, j; 34 u32 flags; 35 36 for (i = 0, j = 0; 37 i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS; 38 i++) { 39 flags = req->channels[i]->flags; 40 41 if (!test_bit(i, wl->scan.scanned_ch) && 42 !(flags & IEEE80211_CHAN_DISABLED) && 43 (req->channels[i]->band == band) && 44 /* 45 * In passive scans, we scan all remaining 46 * channels, even if not marked as such. 47 * In active scans, we only scan channels not 48 * marked as passive. 49 */ 50 (passive || !(flags & IEEE80211_CHAN_PASSIVE_SCAN))) { 51 wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ", 52 req->channels[i]->band, 53 req->channels[i]->center_freq); 54 wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X", 55 req->channels[i]->hw_value, 56 req->channels[i]->flags); 57 wl1271_debug(DEBUG_SCAN, 58 "max_antenna_gain %d, max_power %d", 59 req->channels[i]->max_antenna_gain, 60 req->channels[i]->max_power); 61 wl1271_debug(DEBUG_SCAN, "beacon_found %d", 62 req->channels[i]->beacon_found); 63 64 if (!passive) { 65 channels[j].min_duration = 66 cpu_to_le32(c->min_dwell_time_active); 67 channels[j].max_duration = 68 cpu_to_le32(c->max_dwell_time_active); 69 } else { 70 channels[j].min_duration = 71 cpu_to_le32(c->dwell_time_passive); 72 channels[j].max_duration = 73 cpu_to_le32(c->dwell_time_passive); 74 } 75 channels[j].early_termination = 0; 76 channels[j].tx_power_att = req->channels[i]->max_power; 77 channels[j].channel = req->channels[i]->hw_value; 78 79 memset(&channels[j].bssid_lsb, 0xff, 4); 80 memset(&channels[j].bssid_msb, 0xff, 2); 81 82 /* Mark the channels we already used */ 83 set_bit(i, wl->scan.scanned_ch); 84 85 j++; 86 } 87 } 88 89 return j; 90 } 91 92 #define WL1271_NOTHING_TO_SCAN 1 93 94 static int wl1271_scan_send(struct wl1271 *wl, struct wl12xx_vif *wlvif, 95 enum ieee80211_band band, 96 bool passive, u32 basic_rate) 97 { 98 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 99 struct wl1271_cmd_scan *cmd; 100 struct wl1271_cmd_trigger_scan_to *trigger; 101 int ret; 102 u16 scan_options = 0; 103 104 /* skip active scans if we don't have SSIDs */ 105 if (!passive && wl->scan.req->n_ssids == 0) 106 return WL1271_NOTHING_TO_SCAN; 107 108 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 109 trigger = kzalloc(sizeof(*trigger), GFP_KERNEL); 110 if (!cmd || !trigger) { 111 ret = -ENOMEM; 112 goto out; 113 } 114 115 if (wl->conf.scan.split_scan_timeout) 116 scan_options |= WL1271_SCAN_OPT_SPLIT_SCAN; 117 118 if (passive) 119 scan_options |= WL1271_SCAN_OPT_PASSIVE; 120 121 cmd->params.role_id = wlvif->role_id; 122 123 if (WARN_ON(cmd->params.role_id == WL12XX_INVALID_ROLE_ID)) { 124 ret = -EINVAL; 125 goto out; 126 } 127 128 cmd->params.scan_options = cpu_to_le16(scan_options); 129 130 cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req, 131 cmd->channels, 132 band, passive); 133 if (cmd->params.n_ch == 0) { 134 ret = WL1271_NOTHING_TO_SCAN; 135 goto out; 136 } 137 138 cmd->params.tx_rate = cpu_to_le32(basic_rate); 139 cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs; 140 cmd->params.tid_trigger = CONF_TX_AC_ANY_TID; 141 cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG; 142 143 if (band == IEEE80211_BAND_2GHZ) 144 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ; 145 else 146 cmd->params.band = WL1271_SCAN_BAND_5_GHZ; 147 148 if (wl->scan.ssid_len && wl->scan.ssid) { 149 cmd->params.ssid_len = wl->scan.ssid_len; 150 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len); 151 } 152 153 memcpy(cmd->addr, vif->addr, ETH_ALEN); 154 155 ret = wl12xx_cmd_build_probe_req(wl, wlvif, 156 cmd->params.role_id, band, 157 wl->scan.ssid, wl->scan.ssid_len, 158 wl->scan.req->ie, 159 wl->scan.req->ie_len, false); 160 if (ret < 0) { 161 wl1271_error("PROBE request template failed"); 162 goto out; 163 } 164 165 trigger->timeout = cpu_to_le32(wl->conf.scan.split_scan_timeout); 166 ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger, 167 sizeof(*trigger), 0); 168 if (ret < 0) { 169 wl1271_error("trigger scan to failed for hw scan"); 170 goto out; 171 } 172 173 wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd)); 174 175 ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0); 176 if (ret < 0) { 177 wl1271_error("SCAN failed"); 178 goto out; 179 } 180 181 out: 182 kfree(cmd); 183 kfree(trigger); 184 return ret; 185 } 186 187 int wl12xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif) 188 { 189 struct wl1271_cmd_header *cmd = NULL; 190 int ret = 0; 191 192 if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE)) 193 return -EINVAL; 194 195 wl1271_debug(DEBUG_CMD, "cmd scan stop"); 196 197 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 198 if (!cmd) { 199 ret = -ENOMEM; 200 goto out; 201 } 202 203 ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd, 204 sizeof(*cmd), 0); 205 if (ret < 0) { 206 wl1271_error("cmd stop_scan failed"); 207 goto out; 208 } 209 out: 210 kfree(cmd); 211 return ret; 212 } 213 214 void wl1271_scan_stm(struct wl1271 *wl, struct wl12xx_vif *wlvif) 215 { 216 int ret = 0; 217 enum ieee80211_band band; 218 u32 rate, mask; 219 220 switch (wl->scan.state) { 221 case WL1271_SCAN_STATE_IDLE: 222 break; 223 224 case WL1271_SCAN_STATE_2GHZ_ACTIVE: 225 band = IEEE80211_BAND_2GHZ; 226 mask = wlvif->bitrate_masks[band]; 227 if (wl->scan.req->no_cck) { 228 mask &= ~CONF_TX_CCK_RATES; 229 if (!mask) 230 mask = CONF_TX_RATE_MASK_BASIC_P2P; 231 } 232 rate = wl1271_tx_min_rate_get(wl, mask); 233 ret = wl1271_scan_send(wl, wlvif, band, false, rate); 234 if (ret == WL1271_NOTHING_TO_SCAN) { 235 wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE; 236 wl1271_scan_stm(wl, wlvif); 237 } 238 239 break; 240 241 case WL1271_SCAN_STATE_2GHZ_PASSIVE: 242 band = IEEE80211_BAND_2GHZ; 243 mask = wlvif->bitrate_masks[band]; 244 if (wl->scan.req->no_cck) { 245 mask &= ~CONF_TX_CCK_RATES; 246 if (!mask) 247 mask = CONF_TX_RATE_MASK_BASIC_P2P; 248 } 249 rate = wl1271_tx_min_rate_get(wl, mask); 250 ret = wl1271_scan_send(wl, wlvif, band, true, rate); 251 if (ret == WL1271_NOTHING_TO_SCAN) { 252 if (wl->enable_11a) 253 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE; 254 else 255 wl->scan.state = WL1271_SCAN_STATE_DONE; 256 wl1271_scan_stm(wl, wlvif); 257 } 258 259 break; 260 261 case WL1271_SCAN_STATE_5GHZ_ACTIVE: 262 band = IEEE80211_BAND_5GHZ; 263 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]); 264 ret = wl1271_scan_send(wl, wlvif, band, false, rate); 265 if (ret == WL1271_NOTHING_TO_SCAN) { 266 wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE; 267 wl1271_scan_stm(wl, wlvif); 268 } 269 270 break; 271 272 case WL1271_SCAN_STATE_5GHZ_PASSIVE: 273 band = IEEE80211_BAND_5GHZ; 274 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]); 275 ret = wl1271_scan_send(wl, wlvif, band, true, rate); 276 if (ret == WL1271_NOTHING_TO_SCAN) { 277 wl->scan.state = WL1271_SCAN_STATE_DONE; 278 wl1271_scan_stm(wl, wlvif); 279 } 280 281 break; 282 283 case WL1271_SCAN_STATE_DONE: 284 wl->scan.failed = false; 285 cancel_delayed_work(&wl->scan_complete_work); 286 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work, 287 msecs_to_jiffies(0)); 288 break; 289 290 default: 291 wl1271_error("invalid scan state"); 292 break; 293 } 294 295 if (ret < 0) { 296 cancel_delayed_work(&wl->scan_complete_work); 297 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work, 298 msecs_to_jiffies(0)); 299 } 300 } 301 302 static void wl12xx_adjust_channels(struct wl1271_cmd_sched_scan_config *cmd, 303 struct wlcore_scan_channels *cmd_channels) 304 { 305 memcpy(cmd->passive, cmd_channels->passive, sizeof(cmd->passive)); 306 memcpy(cmd->active, cmd_channels->active, sizeof(cmd->active)); 307 cmd->dfs = cmd_channels->dfs; 308 cmd->n_pactive_ch = cmd_channels->passive_active; 309 310 memcpy(cmd->channels_2, cmd_channels->channels_2, 311 sizeof(cmd->channels_2)); 312 memcpy(cmd->channels_5, cmd_channels->channels_5, 313 sizeof(cmd->channels_5)); 314 /* channels_4 are not supported, so no need to copy them */ 315 } 316 317 int wl1271_scan_sched_scan_config(struct wl1271 *wl, 318 struct wl12xx_vif *wlvif, 319 struct cfg80211_sched_scan_request *req, 320 struct ieee80211_sched_scan_ies *ies) 321 { 322 struct wl1271_cmd_sched_scan_config *cfg = NULL; 323 struct wlcore_scan_channels *cfg_channels = NULL; 324 struct conf_sched_scan_settings *c = &wl->conf.sched_scan; 325 int i, ret; 326 bool force_passive = !req->n_ssids; 327 328 wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config"); 329 330 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 331 if (!cfg) 332 return -ENOMEM; 333 334 cfg->role_id = wlvif->role_id; 335 cfg->rssi_threshold = c->rssi_threshold; 336 cfg->snr_threshold = c->snr_threshold; 337 cfg->n_probe_reqs = c->num_probe_reqs; 338 /* cycles set to 0 it means infinite (until manually stopped) */ 339 cfg->cycles = 0; 340 /* report APs when at least 1 is found */ 341 cfg->report_after = 1; 342 /* don't stop scanning automatically when something is found */ 343 cfg->terminate = 0; 344 cfg->tag = WL1271_SCAN_DEFAULT_TAG; 345 /* don't filter on BSS type */ 346 cfg->bss_type = SCAN_BSS_TYPE_ANY; 347 /* currently NL80211 supports only a single interval */ 348 for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++) 349 cfg->intervals[i] = cpu_to_le32(req->interval); 350 351 cfg->ssid_len = 0; 352 ret = wlcore_scan_sched_scan_ssid_list(wl, wlvif, req); 353 if (ret < 0) 354 goto out; 355 356 cfg->filter_type = ret; 357 358 wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type); 359 360 cfg_channels = kzalloc(sizeof(*cfg_channels), GFP_KERNEL); 361 if (!cfg_channels) { 362 ret = -ENOMEM; 363 goto out; 364 } 365 366 if (!wlcore_set_scan_chan_params(wl, cfg_channels, req->channels, 367 req->n_channels, req->n_ssids, 368 SCAN_TYPE_PERIODIC)) { 369 wl1271_error("scan channel list is empty"); 370 ret = -EINVAL; 371 goto out; 372 } 373 wl12xx_adjust_channels(cfg, cfg_channels); 374 375 if (!force_passive && cfg->active[0]) { 376 u8 band = IEEE80211_BAND_2GHZ; 377 ret = wl12xx_cmd_build_probe_req(wl, wlvif, 378 wlvif->role_id, band, 379 req->ssids[0].ssid, 380 req->ssids[0].ssid_len, 381 ies->ie[band], 382 ies->len[band], true); 383 if (ret < 0) { 384 wl1271_error("2.4GHz PROBE request template failed"); 385 goto out; 386 } 387 } 388 389 if (!force_passive && cfg->active[1]) { 390 u8 band = IEEE80211_BAND_5GHZ; 391 ret = wl12xx_cmd_build_probe_req(wl, wlvif, 392 wlvif->role_id, band, 393 req->ssids[0].ssid, 394 req->ssids[0].ssid_len, 395 ies->ie[band], 396 ies->len[band], true); 397 if (ret < 0) { 398 wl1271_error("5GHz PROBE request template failed"); 399 goto out; 400 } 401 } 402 403 wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg)); 404 405 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg, 406 sizeof(*cfg), 0); 407 if (ret < 0) { 408 wl1271_error("SCAN configuration failed"); 409 goto out; 410 } 411 out: 412 kfree(cfg_channels); 413 kfree(cfg); 414 return ret; 415 } 416 417 int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif) 418 { 419 struct wl1271_cmd_sched_scan_start *start; 420 int ret = 0; 421 422 wl1271_debug(DEBUG_CMD, "cmd periodic scan start"); 423 424 if (wlvif->bss_type != BSS_TYPE_STA_BSS) 425 return -EOPNOTSUPP; 426 427 if ((wl->quirks & WLCORE_QUIRK_NO_SCHED_SCAN_WHILE_CONN) && 428 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 429 return -EBUSY; 430 431 start = kzalloc(sizeof(*start), GFP_KERNEL); 432 if (!start) 433 return -ENOMEM; 434 435 start->role_id = wlvif->role_id; 436 start->tag = WL1271_SCAN_DEFAULT_TAG; 437 438 ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start, 439 sizeof(*start), 0); 440 if (ret < 0) { 441 wl1271_error("failed to send scan start command"); 442 goto out_free; 443 } 444 445 out_free: 446 kfree(start); 447 return ret; 448 } 449 450 int wl12xx_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, 451 struct cfg80211_sched_scan_request *req, 452 struct ieee80211_sched_scan_ies *ies) 453 { 454 int ret; 455 456 ret = wl1271_scan_sched_scan_config(wl, wlvif, req, ies); 457 if (ret < 0) 458 return ret; 459 460 return wl1271_scan_sched_scan_start(wl, wlvif); 461 } 462 463 void wl12xx_scan_sched_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif) 464 { 465 struct wl1271_cmd_sched_scan_stop *stop; 466 int ret = 0; 467 468 wl1271_debug(DEBUG_CMD, "cmd periodic scan stop"); 469 470 /* FIXME: what to do if alloc'ing to stop fails? */ 471 stop = kzalloc(sizeof(*stop), GFP_KERNEL); 472 if (!stop) { 473 wl1271_error("failed to alloc memory to send sched scan stop"); 474 return; 475 } 476 477 stop->role_id = wlvif->role_id; 478 stop->tag = WL1271_SCAN_DEFAULT_TAG; 479 480 ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop, 481 sizeof(*stop), 0); 482 if (ret < 0) { 483 wl1271_error("failed to send sched scan stop command"); 484 goto out_free; 485 } 486 487 out_free: 488 kfree(stop); 489 } 490 491 int wl12xx_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, 492 struct cfg80211_scan_request *req) 493 { 494 wl1271_scan_stm(wl, wlvif); 495 return 0; 496 } 497 498 void wl12xx_scan_completed(struct wl1271 *wl, struct wl12xx_vif *wlvif) 499 { 500 wl1271_scan_stm(wl, wlvif); 501 } 502