1 /* 2 * wpa_supplicant - WNM 3 * Copyright (c) 2011-2013, Qualcomm Atheros, Inc. 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "common/ieee802_11_defs.h" 13 #include "common/ieee802_11_common.h" 14 #include "common/wpa_ctrl.h" 15 #include "rsn_supp/wpa.h" 16 #include "wpa_supplicant_i.h" 17 #include "driver_i.h" 18 #include "scan.h" 19 #include "ctrl_iface.h" 20 #include "bss.h" 21 #include "wnm_sta.h" 22 #include "hs20_supplicant.h" 23 24 #define MAX_TFS_IE_LEN 1024 25 #define WNM_MAX_NEIGHBOR_REPORT 10 26 27 28 /* get the TFS IE from driver */ 29 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf, 30 u16 *buf_len, enum wnm_oper oper) 31 { 32 wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper); 33 34 return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len); 35 } 36 37 38 /* set the TFS IE to driver */ 39 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s, 40 const u8 *addr, u8 *buf, u16 *buf_len, 41 enum wnm_oper oper) 42 { 43 wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper); 44 45 return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len); 46 } 47 48 49 /* MLME-SLEEPMODE.request */ 50 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s, 51 u8 action, u16 intval, struct wpabuf *tfs_req) 52 { 53 struct ieee80211_mgmt *mgmt; 54 int res; 55 size_t len; 56 struct wnm_sleep_element *wnmsleep_ie; 57 u8 *wnmtfs_ie; 58 u8 wnmsleep_ie_len; 59 u16 wnmtfs_ie_len; /* possibly multiple IE(s) */ 60 enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD : 61 WNM_SLEEP_TFS_REQ_IE_NONE; 62 63 wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request " 64 "action=%s to " MACSTR, 65 action == 0 ? "enter" : "exit", 66 MAC2STR(wpa_s->bssid)); 67 68 /* WNM-Sleep Mode IE */ 69 wnmsleep_ie_len = sizeof(struct wnm_sleep_element); 70 wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element)); 71 if (wnmsleep_ie == NULL) 72 return -1; 73 wnmsleep_ie->eid = WLAN_EID_WNMSLEEP; 74 wnmsleep_ie->len = wnmsleep_ie_len - 2; 75 wnmsleep_ie->action_type = action; 76 wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT; 77 wnmsleep_ie->intval = host_to_le16(intval); 78 wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element", 79 (u8 *) wnmsleep_ie, wnmsleep_ie_len); 80 81 /* TFS IE(s) */ 82 if (tfs_req) { 83 wnmtfs_ie_len = wpabuf_len(tfs_req); 84 wnmtfs_ie = os_malloc(wnmtfs_ie_len); 85 if (wnmtfs_ie == NULL) { 86 os_free(wnmsleep_ie); 87 return -1; 88 } 89 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len); 90 } else { 91 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN); 92 if (wnmtfs_ie == NULL) { 93 os_free(wnmsleep_ie); 94 return -1; 95 } 96 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len, 97 tfs_oper)) { 98 wnmtfs_ie_len = 0; 99 os_free(wnmtfs_ie); 100 wnmtfs_ie = NULL; 101 } 102 } 103 wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element", 104 (u8 *) wnmtfs_ie, wnmtfs_ie_len); 105 106 mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len); 107 if (mgmt == NULL) { 108 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for " 109 "WNM-Sleep Request action frame"); 110 os_free(wnmsleep_ie); 111 os_free(wnmtfs_ie); 112 return -1; 113 } 114 115 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN); 116 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN); 117 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN); 118 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 119 WLAN_FC_STYPE_ACTION); 120 mgmt->u.action.category = WLAN_ACTION_WNM; 121 mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ; 122 mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1; 123 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie, 124 wnmsleep_ie_len); 125 /* copy TFS IE here */ 126 if (wnmtfs_ie_len > 0) { 127 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable + 128 wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len); 129 } 130 131 len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len + 132 wnmtfs_ie_len; 133 134 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid, 135 wpa_s->own_addr, wpa_s->bssid, 136 &mgmt->u.action.category, len, 0); 137 if (res < 0) 138 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request " 139 "(action=%d, intval=%d)", action, intval); 140 141 os_free(wnmsleep_ie); 142 os_free(wnmtfs_ie); 143 os_free(mgmt); 144 145 return res; 146 } 147 148 149 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s, 150 u8 *tfsresp_ie_start, 151 u8 *tfsresp_ie_end) 152 { 153 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM, 154 wpa_s->bssid, NULL, NULL); 155 /* remove GTK/IGTK ?? */ 156 157 /* set the TFS Resp IE(s) */ 158 if (tfsresp_ie_start && tfsresp_ie_end && 159 tfsresp_ie_end - tfsresp_ie_start >= 0) { 160 u16 tfsresp_ie_len; 161 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) - 162 tfsresp_ie_start; 163 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found"); 164 /* pass the TFS Resp IE(s) to driver for processing */ 165 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid, 166 tfsresp_ie_start, 167 &tfsresp_ie_len, 168 WNM_SLEEP_TFS_RESP_IE_SET)) 169 wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE"); 170 } 171 } 172 173 174 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s, 175 const u8 *frm, u16 key_len_total) 176 { 177 u8 *ptr, *end; 178 u8 gtk_len; 179 180 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid, 181 NULL, NULL); 182 183 /* Install GTK/IGTK */ 184 185 /* point to key data field */ 186 ptr = (u8 *) frm + 1 + 2; 187 end = ptr + key_len_total; 188 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total); 189 190 while (ptr + 1 < end) { 191 if (ptr + 2 + ptr[1] > end) { 192 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element " 193 "length"); 194 if (end > ptr) { 195 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data", 196 ptr, end - ptr); 197 } 198 break; 199 } 200 if (*ptr == WNM_SLEEP_SUBELEM_GTK) { 201 if (ptr[1] < 11 + 5) { 202 wpa_printf(MSG_DEBUG, "WNM: Too short GTK " 203 "subelem"); 204 break; 205 } 206 gtk_len = *(ptr + 4); 207 if (ptr[1] < 11 + gtk_len || 208 gtk_len < 5 || gtk_len > 32) { 209 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK " 210 "subelem"); 211 break; 212 } 213 wpa_wnmsleep_install_key( 214 wpa_s->wpa, 215 WNM_SLEEP_SUBELEM_GTK, 216 ptr); 217 ptr += 13 + gtk_len; 218 #ifdef CONFIG_IEEE80211W 219 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) { 220 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) { 221 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK " 222 "subelem"); 223 break; 224 } 225 wpa_wnmsleep_install_key(wpa_s->wpa, 226 WNM_SLEEP_SUBELEM_IGTK, ptr); 227 ptr += 10 + WPA_IGTK_LEN; 228 #endif /* CONFIG_IEEE80211W */ 229 } else 230 break; /* skip the loop */ 231 } 232 } 233 234 235 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s, 236 const u8 *frm, int len) 237 { 238 /* 239 * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data | 240 * WNM-Sleep Mode IE | TFS Response IE 241 */ 242 u8 *pos = (u8 *) frm; /* point to payload after the action field */ 243 u16 key_len_total; 244 struct wnm_sleep_element *wnmsleep_ie = NULL; 245 /* multiple TFS Resp IE (assuming consecutive) */ 246 u8 *tfsresp_ie_start = NULL; 247 u8 *tfsresp_ie_end = NULL; 248 size_t left; 249 250 if (len < 3) 251 return; 252 key_len_total = WPA_GET_LE16(frm + 1); 253 254 wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d", 255 frm[0], key_len_total); 256 left = len - 3; 257 if (key_len_total > left) { 258 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field"); 259 return; 260 } 261 pos += 3 + key_len_total; 262 while (pos - frm < len) { 263 u8 ie_len = *(pos + 1); 264 if (pos + 2 + ie_len > frm + len) { 265 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len); 266 break; 267 } 268 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len); 269 if (*pos == WLAN_EID_WNMSLEEP) 270 wnmsleep_ie = (struct wnm_sleep_element *) pos; 271 else if (*pos == WLAN_EID_TFS_RESP) { 272 if (!tfsresp_ie_start) 273 tfsresp_ie_start = pos; 274 tfsresp_ie_end = pos; 275 } else 276 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos); 277 pos += ie_len + 2; 278 } 279 280 if (!wnmsleep_ie) { 281 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found"); 282 return; 283 } 284 285 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT || 286 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) { 287 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response " 288 "frame (action=%d, intval=%d)", 289 wnmsleep_ie->action_type, wnmsleep_ie->intval); 290 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) { 291 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start, 292 tfsresp_ie_end); 293 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) { 294 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total); 295 } 296 } else { 297 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame " 298 "(action=%d, intval=%d)", 299 wnmsleep_ie->action_type, wnmsleep_ie->intval); 300 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) 301 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL, 302 wpa_s->bssid, NULL, NULL); 303 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) 304 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL, 305 wpa_s->bssid, NULL, NULL); 306 } 307 } 308 309 310 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s) 311 { 312 int i; 313 314 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 315 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot); 316 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid); 317 } 318 319 wpa_s->wnm_num_neighbor_report = 0; 320 os_free(wpa_s->wnm_neighbor_report_elements); 321 wpa_s->wnm_neighbor_report_elements = NULL; 322 } 323 324 325 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep, 326 u8 id, u8 elen, const u8 *pos) 327 { 328 switch (id) { 329 case WNM_NEIGHBOR_TSF: 330 if (elen < 2 + 2) { 331 wpa_printf(MSG_DEBUG, "WNM: Too short TSF"); 332 break; 333 } 334 rep->tsf_offset = WPA_GET_LE16(pos); 335 rep->beacon_int = WPA_GET_LE16(pos + 2); 336 rep->tsf_present = 1; 337 break; 338 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING: 339 if (elen < 2) { 340 wpa_printf(MSG_DEBUG, "WNM: Too short condensed " 341 "country string"); 342 break; 343 } 344 os_memcpy(rep->country, pos, 2); 345 rep->country_present = 1; 346 break; 347 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE: 348 if (elen < 1) { 349 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition " 350 "candidate"); 351 break; 352 } 353 rep->preference = pos[0]; 354 rep->preference_present = 1; 355 break; 356 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION: 357 rep->bss_term_tsf = WPA_GET_LE64(pos); 358 rep->bss_term_dur = WPA_GET_LE16(pos + 8); 359 rep->bss_term_present = 1; 360 break; 361 case WNM_NEIGHBOR_BEARING: 362 if (elen < 8) { 363 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor " 364 "bearing"); 365 break; 366 } 367 rep->bearing = WPA_GET_LE16(pos); 368 rep->distance = WPA_GET_LE32(pos + 2); 369 rep->rel_height = WPA_GET_LE16(pos + 2 + 4); 370 rep->bearing_present = 1; 371 break; 372 case WNM_NEIGHBOR_MEASUREMENT_PILOT: 373 if (elen < 1) { 374 wpa_printf(MSG_DEBUG, "WNM: Too short measurement " 375 "pilot"); 376 break; 377 } 378 os_free(rep->meas_pilot); 379 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot)); 380 if (rep->meas_pilot == NULL) 381 break; 382 rep->meas_pilot->measurement_pilot = pos[0]; 383 rep->meas_pilot->subelem_len = elen - 1; 384 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1); 385 break; 386 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES: 387 if (elen < 5) { 388 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled " 389 "capabilities"); 390 break; 391 } 392 os_memcpy(rep->rm_capab, pos, 5); 393 rep->rm_capab_present = 1; 394 break; 395 case WNM_NEIGHBOR_MULTIPLE_BSSID: 396 if (elen < 1) { 397 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID"); 398 break; 399 } 400 os_free(rep->mul_bssid); 401 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid)); 402 if (rep->mul_bssid == NULL) 403 break; 404 rep->mul_bssid->max_bssid_indicator = pos[0]; 405 rep->mul_bssid->subelem_len = elen - 1; 406 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1); 407 break; 408 } 409 } 410 411 412 static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan) 413 { 414 struct wpa_bss *bss = wpa_s->current_bss; 415 const char *country = NULL; 416 417 if (bss) { 418 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY); 419 420 if (elem && elem[1] >= 2) 421 country = (const char *) (elem + 2); 422 } 423 424 return ieee80211_chan_to_freq(country, op_class, chan); 425 } 426 427 428 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s, 429 const u8 *pos, u8 len, 430 struct neighbor_report *rep) 431 { 432 u8 left = len; 433 434 if (left < 13) { 435 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report"); 436 return; 437 } 438 439 os_memcpy(rep->bssid, pos, ETH_ALEN); 440 rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN); 441 rep->regulatory_class = *(pos + 10); 442 rep->channel_number = *(pos + 11); 443 rep->phy_type = *(pos + 12); 444 445 pos += 13; 446 left -= 13; 447 448 while (left >= 2) { 449 u8 id, elen; 450 451 id = *pos++; 452 elen = *pos++; 453 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen); 454 left -= 2; 455 if (elen > left) { 456 wpa_printf(MSG_DEBUG, 457 "WNM: Truncated neighbor report subelement"); 458 break; 459 } 460 wnm_parse_neighbor_report_elem(rep, id, elen, pos); 461 left -= elen; 462 pos += elen; 463 } 464 465 rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class, 466 rep->channel_number); 467 } 468 469 470 static struct wpa_bss * 471 compare_scan_neighbor_results(struct wpa_supplicant *wpa_s) 472 { 473 474 u8 i; 475 struct wpa_bss *bss = wpa_s->current_bss; 476 struct wpa_bss *target; 477 478 if (!bss) 479 return 0; 480 481 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d", 482 MAC2STR(wpa_s->bssid), bss->level); 483 484 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 485 struct neighbor_report *nei; 486 487 nei = &wpa_s->wnm_neighbor_report_elements[i]; 488 if (nei->preference_present && nei->preference == 0) { 489 wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR, 490 MAC2STR(nei->bssid)); 491 continue; 492 } 493 494 target = wpa_bss_get_bssid(wpa_s, nei->bssid); 495 if (!target) { 496 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR 497 " (pref %d) not found in scan results", 498 MAC2STR(nei->bssid), 499 nei->preference_present ? nei->preference : 500 -1); 501 continue; 502 } 503 504 if (bss->ssid_len != target->ssid_len || 505 os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) { 506 /* 507 * TODO: Could consider allowing transition to another 508 * ESS if PMF was enabled for the association. 509 */ 510 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR 511 " (pref %d) in different ESS", 512 MAC2STR(nei->bssid), 513 nei->preference_present ? nei->preference : 514 -1); 515 continue; 516 } 517 518 if (target->level < bss->level && target->level < -80) { 519 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR 520 " (pref %d) does not have sufficient signal level (%d)", 521 MAC2STR(nei->bssid), 522 nei->preference_present ? nei->preference : 523 -1, 524 target->level); 525 continue; 526 } 527 528 wpa_printf(MSG_DEBUG, 529 "WNM: Found an acceptable preferred transition candidate BSS " 530 MACSTR " (RSSI %d)", 531 MAC2STR(nei->bssid), target->level); 532 return target; 533 } 534 535 return NULL; 536 } 537 538 539 static void wnm_send_bss_transition_mgmt_resp( 540 struct wpa_supplicant *wpa_s, u8 dialog_token, 541 enum bss_trans_mgmt_status_code status, u8 delay, 542 const u8 *target_bssid) 543 { 544 u8 buf[1000], *pos; 545 struct ieee80211_mgmt *mgmt; 546 size_t len; 547 int res; 548 549 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response " 550 "to " MACSTR " dialog_token=%u status=%u delay=%d", 551 MAC2STR(wpa_s->bssid), dialog_token, status, delay); 552 if (!wpa_s->current_bss) { 553 wpa_printf(MSG_DEBUG, 554 "WNM: Current BSS not known - drop response"); 555 return; 556 } 557 558 mgmt = (struct ieee80211_mgmt *) buf; 559 os_memset(&buf, 0, sizeof(buf)); 560 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN); 561 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN); 562 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN); 563 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 564 WLAN_FC_STYPE_ACTION); 565 mgmt->u.action.category = WLAN_ACTION_WNM; 566 mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP; 567 mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token; 568 mgmt->u.action.u.bss_tm_resp.status_code = status; 569 mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay; 570 pos = mgmt->u.action.u.bss_tm_resp.variable; 571 if (target_bssid) { 572 os_memcpy(pos, target_bssid, ETH_ALEN); 573 pos += ETH_ALEN; 574 } else if (status == WNM_BSS_TM_ACCEPT) { 575 /* 576 * P802.11-REVmc clarifies that the Target BSSID field is always 577 * present when status code is zero, so use a fake value here if 578 * no BSSID is yet known. 579 */ 580 os_memset(pos, 0, ETH_ALEN); 581 pos += ETH_ALEN; 582 } 583 584 len = pos - (u8 *) &mgmt->u.action.category; 585 586 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid, 587 wpa_s->own_addr, wpa_s->bssid, 588 &mgmt->u.action.category, len, 0); 589 if (res < 0) { 590 wpa_printf(MSG_DEBUG, 591 "WNM: Failed to send BSS Transition Management Response"); 592 } 593 } 594 595 596 int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail) 597 { 598 struct wpa_bss *bss; 599 struct wpa_ssid *ssid = wpa_s->current_ssid; 600 enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED; 601 602 if (!wpa_s->wnm_neighbor_report_elements) 603 return 0; 604 605 if (os_reltime_before(&wpa_s->wnm_cand_valid_until, 606 &wpa_s->scan_trigger_time)) { 607 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it"); 608 wnm_deallocate_memory(wpa_s); 609 return 0; 610 } 611 612 if (!wpa_s->current_bss || 613 os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid, 614 ETH_ALEN) != 0) { 615 wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it"); 616 return 0; 617 } 618 619 /* Compare the Neighbor Report and scan results */ 620 bss = compare_scan_neighbor_results(wpa_s); 621 if (!bss) { 622 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found"); 623 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES; 624 goto send_bss_resp_fail; 625 } 626 627 /* Associate to the network */ 628 /* Send the BSS Management Response - Accept */ 629 if (wpa_s->wnm_reply) { 630 wpa_s->wnm_reply = 0; 631 wnm_send_bss_transition_mgmt_resp(wpa_s, 632 wpa_s->wnm_dialog_token, 633 WNM_BSS_TM_ACCEPT, 634 0, bss->bssid); 635 } 636 637 if (bss == wpa_s->current_bss) { 638 wpa_printf(MSG_DEBUG, 639 "WNM: Already associated with the preferred candidate"); 640 return 1; 641 } 642 643 wpa_s->reassociate = 1; 644 wpa_supplicant_connect(wpa_s, bss, ssid); 645 wnm_deallocate_memory(wpa_s); 646 return 1; 647 648 send_bss_resp_fail: 649 if (!reply_on_fail) 650 return 0; 651 652 /* Send reject response for all the failures */ 653 654 if (wpa_s->wnm_reply) { 655 wpa_s->wnm_reply = 0; 656 wnm_send_bss_transition_mgmt_resp(wpa_s, 657 wpa_s->wnm_dialog_token, 658 status, 0, NULL); 659 } 660 wnm_deallocate_memory(wpa_s); 661 662 return 0; 663 } 664 665 666 static int cand_pref_compar(const void *a, const void *b) 667 { 668 const struct neighbor_report *aa = a; 669 const struct neighbor_report *bb = b; 670 671 if (!aa->preference_present && !bb->preference_present) 672 return 0; 673 if (!aa->preference_present) 674 return 1; 675 if (!bb->preference_present) 676 return -1; 677 if (bb->preference > aa->preference) 678 return 1; 679 if (bb->preference < aa->preference) 680 return -1; 681 return 0; 682 } 683 684 685 static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s) 686 { 687 if (!wpa_s->wnm_neighbor_report_elements) 688 return; 689 qsort(wpa_s->wnm_neighbor_report_elements, 690 wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report), 691 cand_pref_compar); 692 } 693 694 695 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s) 696 { 697 unsigned int i; 698 699 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List"); 700 if (!wpa_s->wnm_neighbor_report_elements) 701 return; 702 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 703 struct neighbor_report *nei; 704 705 nei = &wpa_s->wnm_neighbor_report_elements[i]; 706 wpa_printf(MSG_DEBUG, "%u: " MACSTR 707 " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d", 708 i, MAC2STR(nei->bssid), nei->bssid_info, 709 nei->regulatory_class, 710 nei->channel_number, nei->phy_type, 711 nei->preference_present ? nei->preference : -1, 712 nei->freq); 713 } 714 } 715 716 717 static int chan_supported(struct wpa_supplicant *wpa_s, int freq) 718 { 719 unsigned int i; 720 721 for (i = 0; i < wpa_s->hw.num_modes; i++) { 722 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i]; 723 int j; 724 725 for (j = 0; j < mode->num_channels; j++) { 726 struct hostapd_channel_data *chan; 727 728 chan = &mode->channels[j]; 729 if (chan->freq == freq && 730 !(chan->flag & HOSTAPD_CHAN_DISABLED)) 731 return 1; 732 } 733 } 734 735 return 0; 736 } 737 738 739 static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s) 740 { 741 int *freqs; 742 int num_freqs = 0; 743 unsigned int i; 744 745 if (!wpa_s->wnm_neighbor_report_elements) 746 return; 747 748 if (wpa_s->hw.modes == NULL) 749 return; 750 751 os_free(wpa_s->next_scan_freqs); 752 wpa_s->next_scan_freqs = NULL; 753 754 freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int)); 755 if (freqs == NULL) 756 return; 757 758 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 759 struct neighbor_report *nei; 760 761 nei = &wpa_s->wnm_neighbor_report_elements[i]; 762 if (nei->freq <= 0) { 763 wpa_printf(MSG_DEBUG, 764 "WNM: Unknown neighbor operating frequency for " 765 MACSTR " - scan all channels", 766 MAC2STR(nei->bssid)); 767 os_free(freqs); 768 return; 769 } 770 if (chan_supported(wpa_s, nei->freq)) 771 add_freq(freqs, &num_freqs, nei->freq); 772 } 773 774 if (num_freqs == 0) { 775 os_free(freqs); 776 return; 777 } 778 779 wpa_printf(MSG_DEBUG, 780 "WNM: Scan %d frequencies based on transition candidate list", 781 num_freqs); 782 wpa_s->next_scan_freqs = freqs; 783 } 784 785 786 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s, 787 const u8 *pos, const u8 *end, 788 int reply) 789 { 790 unsigned int beacon_int; 791 u8 valid_int; 792 793 if (pos + 5 > end) 794 return; 795 796 if (wpa_s->current_bss) 797 beacon_int = wpa_s->current_bss->beacon_int; 798 else 799 beacon_int = 100; /* best guess */ 800 801 wpa_s->wnm_dialog_token = pos[0]; 802 wpa_s->wnm_mode = pos[1]; 803 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2); 804 valid_int = pos[4]; 805 wpa_s->wnm_reply = reply; 806 807 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: " 808 "dialog_token=%u request_mode=0x%x " 809 "disassoc_timer=%u validity_interval=%u", 810 wpa_s->wnm_dialog_token, wpa_s->wnm_mode, 811 wpa_s->wnm_dissoc_timer, valid_int); 812 813 pos += 5; 814 815 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) { 816 if (pos + 12 > end) { 817 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request"); 818 return; 819 } 820 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12); 821 pos += 12; /* BSS Termination Duration */ 822 } 823 824 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) { 825 char url[256]; 826 827 if (pos + 1 > end || pos + 1 + pos[0] > end) { 828 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition " 829 "Management Request (URL)"); 830 return; 831 } 832 os_memcpy(url, pos + 1, pos[0]); 833 url[pos[0]] = '\0'; 834 pos += 1 + pos[0]; 835 836 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s", 837 wpa_sm_pmf_enabled(wpa_s->wpa), 838 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url); 839 } 840 841 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) { 842 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - " 843 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer); 844 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) { 845 /* TODO: mark current BSS less preferred for 846 * selection */ 847 wpa_printf(MSG_DEBUG, "Trying to find another BSS"); 848 wpa_supplicant_req_scan(wpa_s, 0, 0); 849 } 850 } 851 852 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) { 853 unsigned int valid_ms; 854 855 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available"); 856 wnm_deallocate_memory(wpa_s); 857 wpa_s->wnm_neighbor_report_elements = os_calloc( 858 WNM_MAX_NEIGHBOR_REPORT, 859 sizeof(struct neighbor_report)); 860 if (wpa_s->wnm_neighbor_report_elements == NULL) 861 return; 862 863 while (pos + 2 <= end && 864 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT) 865 { 866 u8 tag = *pos++; 867 u8 len = *pos++; 868 869 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u", 870 tag); 871 if (pos + len > end) { 872 wpa_printf(MSG_DEBUG, "WNM: Truncated request"); 873 return; 874 } 875 if (tag == WLAN_EID_NEIGHBOR_REPORT) { 876 struct neighbor_report *rep; 877 rep = &wpa_s->wnm_neighbor_report_elements[ 878 wpa_s->wnm_num_neighbor_report]; 879 wnm_parse_neighbor_report(wpa_s, pos, len, rep); 880 } 881 882 pos += len; 883 wpa_s->wnm_num_neighbor_report++; 884 } 885 wnm_sort_cand_list(wpa_s); 886 wnm_dump_cand_list(wpa_s); 887 valid_ms = valid_int * beacon_int * 128 / 125; 888 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms", 889 valid_ms); 890 os_get_reltime(&wpa_s->wnm_cand_valid_until); 891 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000; 892 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000; 893 wpa_s->wnm_cand_valid_until.sec += 894 wpa_s->wnm_cand_valid_until.usec / 1000000; 895 wpa_s->wnm_cand_valid_until.usec %= 1000000; 896 os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN); 897 898 if (wpa_s->last_scan_res_used > 0) { 899 struct os_reltime now; 900 901 os_get_reltime(&now); 902 if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) { 903 wpa_printf(MSG_DEBUG, 904 "WNM: Try to use recent scan results"); 905 if (wnm_scan_process(wpa_s, 0) > 0) 906 return; 907 wpa_printf(MSG_DEBUG, 908 "WNM: No match in previous scan results - try a new scan"); 909 } 910 } 911 912 wnm_set_scan_freqs(wpa_s); 913 wpa_supplicant_req_scan(wpa_s, 0, 0); 914 } else if (reply) { 915 enum bss_trans_mgmt_status_code status; 916 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) 917 status = WNM_BSS_TM_ACCEPT; 918 else { 919 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates"); 920 status = WNM_BSS_TM_REJECT_UNSPECIFIED; 921 } 922 wnm_send_bss_transition_mgmt_resp(wpa_s, 923 wpa_s->wnm_dialog_token, 924 status, 0, NULL); 925 } 926 } 927 928 929 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s, 930 u8 query_reason) 931 { 932 u8 buf[1000], *pos; 933 struct ieee80211_mgmt *mgmt; 934 size_t len; 935 int ret; 936 937 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to " 938 MACSTR " query_reason=%u", 939 MAC2STR(wpa_s->bssid), query_reason); 940 941 mgmt = (struct ieee80211_mgmt *) buf; 942 os_memset(&buf, 0, sizeof(buf)); 943 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN); 944 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN); 945 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN); 946 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 947 WLAN_FC_STYPE_ACTION); 948 mgmt->u.action.category = WLAN_ACTION_WNM; 949 mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY; 950 mgmt->u.action.u.bss_tm_query.dialog_token = 1; 951 mgmt->u.action.u.bss_tm_query.query_reason = query_reason; 952 pos = mgmt->u.action.u.bss_tm_query.variable; 953 954 len = pos - (u8 *) &mgmt->u.action.category; 955 956 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid, 957 wpa_s->own_addr, wpa_s->bssid, 958 &mgmt->u.action.category, len, 0); 959 960 return ret; 961 } 962 963 964 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s, 965 const u8 *sa, const u8 *data, 966 int len) 967 { 968 const u8 *pos, *end, *next; 969 u8 ie, ie_len; 970 971 pos = data; 972 end = data + len; 973 974 while (pos + 1 < end) { 975 ie = *pos++; 976 ie_len = *pos++; 977 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u", 978 ie, ie_len); 979 if (ie_len > end - pos) { 980 wpa_printf(MSG_DEBUG, "WNM: Not enough room for " 981 "subelement"); 982 break; 983 } 984 next = pos + ie_len; 985 if (ie_len < 4) { 986 pos = next; 987 continue; 988 } 989 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u", 990 WPA_GET_BE24(pos), pos[3]); 991 992 #ifdef CONFIG_HS20 993 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 && 994 WPA_GET_BE24(pos) == OUI_WFA && 995 pos[3] == HS20_WNM_SUB_REM_NEEDED) { 996 /* Subscription Remediation subelement */ 997 const u8 *ie_end; 998 u8 url_len; 999 char *url; 1000 u8 osu_method; 1001 1002 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation " 1003 "subelement"); 1004 ie_end = pos + ie_len; 1005 pos += 4; 1006 url_len = *pos++; 1007 if (url_len == 0) { 1008 wpa_printf(MSG_DEBUG, "WNM: No Server URL included"); 1009 url = NULL; 1010 osu_method = 1; 1011 } else { 1012 if (pos + url_len + 1 > ie_end) { 1013 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)", 1014 url_len, 1015 (int) (ie_end - pos)); 1016 break; 1017 } 1018 url = os_malloc(url_len + 1); 1019 if (url == NULL) 1020 break; 1021 os_memcpy(url, pos, url_len); 1022 url[url_len] = '\0'; 1023 osu_method = pos[url_len]; 1024 } 1025 hs20_rx_subscription_remediation(wpa_s, url, 1026 osu_method); 1027 os_free(url); 1028 pos = next; 1029 continue; 1030 } 1031 1032 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 && 1033 WPA_GET_BE24(pos) == OUI_WFA && 1034 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) { 1035 const u8 *ie_end; 1036 u8 url_len; 1037 char *url; 1038 u8 code; 1039 u16 reauth_delay; 1040 1041 ie_end = pos + ie_len; 1042 pos += 4; 1043 code = *pos++; 1044 reauth_delay = WPA_GET_LE16(pos); 1045 pos += 2; 1046 url_len = *pos++; 1047 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication " 1048 "Imminent - Reason Code %u " 1049 "Re-Auth Delay %u URL Length %u", 1050 code, reauth_delay, url_len); 1051 if (pos + url_len > ie_end) 1052 break; 1053 url = os_malloc(url_len + 1); 1054 if (url == NULL) 1055 break; 1056 os_memcpy(url, pos, url_len); 1057 url[url_len] = '\0'; 1058 hs20_rx_deauth_imminent_notice(wpa_s, code, 1059 reauth_delay, url); 1060 os_free(url); 1061 pos = next; 1062 continue; 1063 } 1064 #endif /* CONFIG_HS20 */ 1065 1066 pos = next; 1067 } 1068 } 1069 1070 1071 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s, 1072 const u8 *sa, const u8 *frm, int len) 1073 { 1074 const u8 *pos, *end; 1075 u8 dialog_token, type; 1076 1077 /* Dialog Token [1] | Type [1] | Subelements */ 1078 1079 if (len < 2 || sa == NULL) 1080 return; 1081 end = frm + len; 1082 pos = frm; 1083 dialog_token = *pos++; 1084 type = *pos++; 1085 1086 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request " 1087 "(dialog_token %u type %u sa " MACSTR ")", 1088 dialog_token, type, MAC2STR(sa)); 1089 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements", 1090 pos, end - pos); 1091 1092 if (wpa_s->wpa_state != WPA_COMPLETED || 1093 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) { 1094 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not " 1095 "from our AP - ignore it"); 1096 return; 1097 } 1098 1099 switch (type) { 1100 case 1: 1101 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos); 1102 break; 1103 default: 1104 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown " 1105 "WNM-Notification type %u", type); 1106 break; 1107 } 1108 } 1109 1110 1111 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s, 1112 const struct ieee80211_mgmt *mgmt, size_t len) 1113 { 1114 const u8 *pos, *end; 1115 u8 act; 1116 1117 if (len < IEEE80211_HDRLEN + 2) 1118 return; 1119 1120 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1; 1121 act = *pos++; 1122 end = ((const u8 *) mgmt) + len; 1123 1124 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR, 1125 act, MAC2STR(mgmt->sa)); 1126 if (wpa_s->wpa_state < WPA_ASSOCIATED || 1127 os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) { 1128 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action " 1129 "frame"); 1130 return; 1131 } 1132 1133 switch (act) { 1134 case WNM_BSS_TRANS_MGMT_REQ: 1135 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end, 1136 !(mgmt->da[0] & 0x01)); 1137 break; 1138 case WNM_SLEEP_MODE_RESP: 1139 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos); 1140 break; 1141 case WNM_NOTIFICATION_REQ: 1142 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos); 1143 break; 1144 default: 1145 wpa_printf(MSG_ERROR, "WNM: Unknown request"); 1146 break; 1147 } 1148 } 1149
