wnm_sta.c revision 324697
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 */ 29static 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 */ 39static 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 */ 50int 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 else 141 wpa_s->wnmsleep_used = 1; 142 143 os_free(wnmsleep_ie); 144 os_free(wnmtfs_ie); 145 os_free(mgmt); 146 147 return res; 148} 149 150 151static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s, 152 u8 *tfsresp_ie_start, 153 u8 *tfsresp_ie_end) 154{ 155 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM, 156 wpa_s->bssid, NULL, NULL); 157 /* remove GTK/IGTK ?? */ 158 159 /* set the TFS Resp IE(s) */ 160 if (tfsresp_ie_start && tfsresp_ie_end && 161 tfsresp_ie_end - tfsresp_ie_start >= 0) { 162 u16 tfsresp_ie_len; 163 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) - 164 tfsresp_ie_start; 165 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found"); 166 /* pass the TFS Resp IE(s) to driver for processing */ 167 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid, 168 tfsresp_ie_start, 169 &tfsresp_ie_len, 170 WNM_SLEEP_TFS_RESP_IE_SET)) 171 wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE"); 172 } 173} 174 175 176static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s, 177 const u8 *frm, u16 key_len_total) 178{ 179 u8 *ptr, *end; 180 u8 gtk_len; 181 182 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid, 183 NULL, NULL); 184 185 /* Install GTK/IGTK */ 186 187 /* point to key data field */ 188 ptr = (u8 *) frm + 1 + 2; 189 end = ptr + key_len_total; 190 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total); 191 192 if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) { 193 wpa_msg(wpa_s, MSG_INFO, 194 "WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled"); 195 return; 196 } 197 198 while (ptr + 1 < end) { 199 if (ptr + 2 + ptr[1] > end) { 200 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element " 201 "length"); 202 if (end > ptr) { 203 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data", 204 ptr, end - ptr); 205 } 206 break; 207 } 208 if (*ptr == WNM_SLEEP_SUBELEM_GTK) { 209 if (ptr[1] < 11 + 5) { 210 wpa_printf(MSG_DEBUG, "WNM: Too short GTK " 211 "subelem"); 212 break; 213 } 214 gtk_len = *(ptr + 4); 215 if (ptr[1] < 11 + gtk_len || 216 gtk_len < 5 || gtk_len > 32) { 217 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK " 218 "subelem"); 219 break; 220 } 221 wpa_wnmsleep_install_key( 222 wpa_s->wpa, 223 WNM_SLEEP_SUBELEM_GTK, 224 ptr); 225 ptr += 13 + gtk_len; 226#ifdef CONFIG_IEEE80211W 227 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) { 228 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) { 229 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK " 230 "subelem"); 231 break; 232 } 233 wpa_wnmsleep_install_key(wpa_s->wpa, 234 WNM_SLEEP_SUBELEM_IGTK, ptr); 235 ptr += 10 + WPA_IGTK_LEN; 236#endif /* CONFIG_IEEE80211W */ 237 } else 238 break; /* skip the loop */ 239 } 240} 241 242 243static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s, 244 const u8 *frm, int len) 245{ 246 /* 247 * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data | 248 * WNM-Sleep Mode IE | TFS Response IE 249 */ 250 u8 *pos = (u8 *) frm; /* point to payload after the action field */ 251 u16 key_len_total; 252 struct wnm_sleep_element *wnmsleep_ie = NULL; 253 /* multiple TFS Resp IE (assuming consecutive) */ 254 u8 *tfsresp_ie_start = NULL; 255 u8 *tfsresp_ie_end = NULL; 256 size_t left; 257 258 if (!wpa_s->wnmsleep_used) { 259 wpa_printf(MSG_DEBUG, 260 "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested"); 261 return; 262 } 263 264 if (len < 3) 265 return; 266 key_len_total = WPA_GET_LE16(frm + 1); 267 268 wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d", 269 frm[0], key_len_total); 270 left = len - 3; 271 if (key_len_total > left) { 272 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field"); 273 return; 274 } 275 pos += 3 + key_len_total; 276 while (pos - frm < len) { 277 u8 ie_len = *(pos + 1); 278 if (pos + 2 + ie_len > frm + len) { 279 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len); 280 break; 281 } 282 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len); 283 if (*pos == WLAN_EID_WNMSLEEP) 284 wnmsleep_ie = (struct wnm_sleep_element *) pos; 285 else if (*pos == WLAN_EID_TFS_RESP) { 286 if (!tfsresp_ie_start) 287 tfsresp_ie_start = pos; 288 tfsresp_ie_end = pos; 289 } else 290 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos); 291 pos += ie_len + 2; 292 } 293 294 if (!wnmsleep_ie) { 295 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found"); 296 return; 297 } 298 299 wpa_s->wnmsleep_used = 0; 300 301 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT || 302 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) { 303 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response " 304 "frame (action=%d, intval=%d)", 305 wnmsleep_ie->action_type, wnmsleep_ie->intval); 306 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) { 307 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start, 308 tfsresp_ie_end); 309 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) { 310 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total); 311 } 312 } else { 313 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame " 314 "(action=%d, intval=%d)", 315 wnmsleep_ie->action_type, wnmsleep_ie->intval); 316 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) 317 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL, 318 wpa_s->bssid, NULL, NULL); 319 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) 320 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL, 321 wpa_s->bssid, NULL, NULL); 322 } 323} 324 325 326void wnm_deallocate_memory(struct wpa_supplicant *wpa_s) 327{ 328 int i; 329 330 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 331 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot); 332 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid); 333 } 334 335 wpa_s->wnm_num_neighbor_report = 0; 336 os_free(wpa_s->wnm_neighbor_report_elements); 337 wpa_s->wnm_neighbor_report_elements = NULL; 338} 339 340 341static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep, 342 u8 id, u8 elen, const u8 *pos) 343{ 344 switch (id) { 345 case WNM_NEIGHBOR_TSF: 346 if (elen < 2 + 2) { 347 wpa_printf(MSG_DEBUG, "WNM: Too short TSF"); 348 break; 349 } 350 rep->tsf_offset = WPA_GET_LE16(pos); 351 rep->beacon_int = WPA_GET_LE16(pos + 2); 352 rep->tsf_present = 1; 353 break; 354 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING: 355 if (elen < 2) { 356 wpa_printf(MSG_DEBUG, "WNM: Too short condensed " 357 "country string"); 358 break; 359 } 360 os_memcpy(rep->country, pos, 2); 361 rep->country_present = 1; 362 break; 363 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE: 364 if (elen < 1) { 365 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition " 366 "candidate"); 367 break; 368 } 369 rep->preference = pos[0]; 370 rep->preference_present = 1; 371 break; 372 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION: 373 rep->bss_term_tsf = WPA_GET_LE64(pos); 374 rep->bss_term_dur = WPA_GET_LE16(pos + 8); 375 rep->bss_term_present = 1; 376 break; 377 case WNM_NEIGHBOR_BEARING: 378 if (elen < 8) { 379 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor " 380 "bearing"); 381 break; 382 } 383 rep->bearing = WPA_GET_LE16(pos); 384 rep->distance = WPA_GET_LE32(pos + 2); 385 rep->rel_height = WPA_GET_LE16(pos + 2 + 4); 386 rep->bearing_present = 1; 387 break; 388 case WNM_NEIGHBOR_MEASUREMENT_PILOT: 389 if (elen < 1) { 390 wpa_printf(MSG_DEBUG, "WNM: Too short measurement " 391 "pilot"); 392 break; 393 } 394 os_free(rep->meas_pilot); 395 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot)); 396 if (rep->meas_pilot == NULL) 397 break; 398 rep->meas_pilot->measurement_pilot = pos[0]; 399 rep->meas_pilot->subelem_len = elen - 1; 400 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1); 401 break; 402 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES: 403 if (elen < 5) { 404 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled " 405 "capabilities"); 406 break; 407 } 408 os_memcpy(rep->rm_capab, pos, 5); 409 rep->rm_capab_present = 1; 410 break; 411 case WNM_NEIGHBOR_MULTIPLE_BSSID: 412 if (elen < 1) { 413 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID"); 414 break; 415 } 416 os_free(rep->mul_bssid); 417 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid)); 418 if (rep->mul_bssid == NULL) 419 break; 420 rep->mul_bssid->max_bssid_indicator = pos[0]; 421 rep->mul_bssid->subelem_len = elen - 1; 422 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1); 423 break; 424 } 425} 426 427 428static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan) 429{ 430 struct wpa_bss *bss = wpa_s->current_bss; 431 const char *country = NULL; 432 433 if (bss) { 434 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY); 435 436 if (elem && elem[1] >= 2) 437 country = (const char *) (elem + 2); 438 } 439 440 return ieee80211_chan_to_freq(country, op_class, chan); 441} 442 443 444static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s, 445 const u8 *pos, u8 len, 446 struct neighbor_report *rep) 447{ 448 u8 left = len; 449 450 if (left < 13) { 451 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report"); 452 return; 453 } 454 455 os_memcpy(rep->bssid, pos, ETH_ALEN); 456 rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN); 457 rep->regulatory_class = *(pos + 10); 458 rep->channel_number = *(pos + 11); 459 rep->phy_type = *(pos + 12); 460 461 pos += 13; 462 left -= 13; 463 464 while (left >= 2) { 465 u8 id, elen; 466 467 id = *pos++; 468 elen = *pos++; 469 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen); 470 left -= 2; 471 if (elen > left) { 472 wpa_printf(MSG_DEBUG, 473 "WNM: Truncated neighbor report subelement"); 474 break; 475 } 476 wnm_parse_neighbor_report_elem(rep, id, elen, pos); 477 left -= elen; 478 pos += elen; 479 } 480 481 rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class, 482 rep->channel_number); 483} 484 485 486static struct wpa_bss * 487compare_scan_neighbor_results(struct wpa_supplicant *wpa_s) 488{ 489 490 u8 i; 491 struct wpa_bss *bss = wpa_s->current_bss; 492 struct wpa_bss *target; 493 494 if (!bss) 495 return 0; 496 497 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d", 498 MAC2STR(wpa_s->bssid), bss->level); 499 500 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 501 struct neighbor_report *nei; 502 503 nei = &wpa_s->wnm_neighbor_report_elements[i]; 504 if (nei->preference_present && nei->preference == 0) { 505 wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR, 506 MAC2STR(nei->bssid)); 507 continue; 508 } 509 510 target = wpa_bss_get_bssid(wpa_s, nei->bssid); 511 if (!target) { 512 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR 513 " (pref %d) not found in scan results", 514 MAC2STR(nei->bssid), 515 nei->preference_present ? nei->preference : 516 -1); 517 continue; 518 } 519 520 if (bss->ssid_len != target->ssid_len || 521 os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) { 522 /* 523 * TODO: Could consider allowing transition to another 524 * ESS if PMF was enabled for the association. 525 */ 526 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR 527 " (pref %d) in different ESS", 528 MAC2STR(nei->bssid), 529 nei->preference_present ? nei->preference : 530 -1); 531 continue; 532 } 533 534 if (target->level < bss->level && target->level < -80) { 535 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR 536 " (pref %d) does not have sufficient signal level (%d)", 537 MAC2STR(nei->bssid), 538 nei->preference_present ? nei->preference : 539 -1, 540 target->level); 541 continue; 542 } 543 544 wpa_printf(MSG_DEBUG, 545 "WNM: Found an acceptable preferred transition candidate BSS " 546 MACSTR " (RSSI %d)", 547 MAC2STR(nei->bssid), target->level); 548 return target; 549 } 550 551 return NULL; 552} 553 554 555static void wnm_send_bss_transition_mgmt_resp( 556 struct wpa_supplicant *wpa_s, u8 dialog_token, 557 enum bss_trans_mgmt_status_code status, u8 delay, 558 const u8 *target_bssid) 559{ 560 u8 buf[1000], *pos; 561 struct ieee80211_mgmt *mgmt; 562 size_t len; 563 int res; 564 565 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response " 566 "to " MACSTR " dialog_token=%u status=%u delay=%d", 567 MAC2STR(wpa_s->bssid), dialog_token, status, delay); 568 if (!wpa_s->current_bss) { 569 wpa_printf(MSG_DEBUG, 570 "WNM: Current BSS not known - drop response"); 571 return; 572 } 573 574 mgmt = (struct ieee80211_mgmt *) buf; 575 os_memset(&buf, 0, sizeof(buf)); 576 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN); 577 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN); 578 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN); 579 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 580 WLAN_FC_STYPE_ACTION); 581 mgmt->u.action.category = WLAN_ACTION_WNM; 582 mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP; 583 mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token; 584 mgmt->u.action.u.bss_tm_resp.status_code = status; 585 mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay; 586 pos = mgmt->u.action.u.bss_tm_resp.variable; 587 if (target_bssid) { 588 os_memcpy(pos, target_bssid, ETH_ALEN); 589 pos += ETH_ALEN; 590 } else if (status == WNM_BSS_TM_ACCEPT) { 591 /* 592 * P802.11-REVmc clarifies that the Target BSSID field is always 593 * present when status code is zero, so use a fake value here if 594 * no BSSID is yet known. 595 */ 596 os_memset(pos, 0, ETH_ALEN); 597 pos += ETH_ALEN; 598 } 599 600 len = pos - (u8 *) &mgmt->u.action.category; 601 602 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid, 603 wpa_s->own_addr, wpa_s->bssid, 604 &mgmt->u.action.category, len, 0); 605 if (res < 0) { 606 wpa_printf(MSG_DEBUG, 607 "WNM: Failed to send BSS Transition Management Response"); 608 } 609} 610 611 612int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail) 613{ 614 struct wpa_bss *bss; 615 struct wpa_ssid *ssid = wpa_s->current_ssid; 616 enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED; 617 618 if (!wpa_s->wnm_neighbor_report_elements) 619 return 0; 620 621 if (os_reltime_before(&wpa_s->wnm_cand_valid_until, 622 &wpa_s->scan_trigger_time)) { 623 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it"); 624 wnm_deallocate_memory(wpa_s); 625 return 0; 626 } 627 628 if (!wpa_s->current_bss || 629 os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid, 630 ETH_ALEN) != 0) { 631 wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it"); 632 return 0; 633 } 634 635 /* Compare the Neighbor Report and scan results */ 636 bss = compare_scan_neighbor_results(wpa_s); 637 if (!bss) { 638 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found"); 639 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES; 640 goto send_bss_resp_fail; 641 } 642 643 /* Associate to the network */ 644 /* Send the BSS Management Response - Accept */ 645 if (wpa_s->wnm_reply) { 646 wpa_s->wnm_reply = 0; 647 wnm_send_bss_transition_mgmt_resp(wpa_s, 648 wpa_s->wnm_dialog_token, 649 WNM_BSS_TM_ACCEPT, 650 0, bss->bssid); 651 } 652 653 if (bss == wpa_s->current_bss) { 654 wpa_printf(MSG_DEBUG, 655 "WNM: Already associated with the preferred candidate"); 656 return 1; 657 } 658 659 wpa_s->reassociate = 1; 660 wpa_supplicant_connect(wpa_s, bss, ssid); 661 wnm_deallocate_memory(wpa_s); 662 return 1; 663 664send_bss_resp_fail: 665 if (!reply_on_fail) 666 return 0; 667 668 /* Send reject response for all the failures */ 669 670 if (wpa_s->wnm_reply) { 671 wpa_s->wnm_reply = 0; 672 wnm_send_bss_transition_mgmt_resp(wpa_s, 673 wpa_s->wnm_dialog_token, 674 status, 0, NULL); 675 } 676 wnm_deallocate_memory(wpa_s); 677 678 return 0; 679} 680 681 682static int cand_pref_compar(const void *a, const void *b) 683{ 684 const struct neighbor_report *aa = a; 685 const struct neighbor_report *bb = b; 686 687 if (!aa->preference_present && !bb->preference_present) 688 return 0; 689 if (!aa->preference_present) 690 return 1; 691 if (!bb->preference_present) 692 return -1; 693 if (bb->preference > aa->preference) 694 return 1; 695 if (bb->preference < aa->preference) 696 return -1; 697 return 0; 698} 699 700 701static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s) 702{ 703 if (!wpa_s->wnm_neighbor_report_elements) 704 return; 705 qsort(wpa_s->wnm_neighbor_report_elements, 706 wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report), 707 cand_pref_compar); 708} 709 710 711static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s) 712{ 713 unsigned int i; 714 715 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List"); 716 if (!wpa_s->wnm_neighbor_report_elements) 717 return; 718 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 719 struct neighbor_report *nei; 720 721 nei = &wpa_s->wnm_neighbor_report_elements[i]; 722 wpa_printf(MSG_DEBUG, "%u: " MACSTR 723 " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d", 724 i, MAC2STR(nei->bssid), nei->bssid_info, 725 nei->regulatory_class, 726 nei->channel_number, nei->phy_type, 727 nei->preference_present ? nei->preference : -1, 728 nei->freq); 729 } 730} 731 732 733static int chan_supported(struct wpa_supplicant *wpa_s, int freq) 734{ 735 unsigned int i; 736 737 for (i = 0; i < wpa_s->hw.num_modes; i++) { 738 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i]; 739 int j; 740 741 for (j = 0; j < mode->num_channels; j++) { 742 struct hostapd_channel_data *chan; 743 744 chan = &mode->channels[j]; 745 if (chan->freq == freq && 746 !(chan->flag & HOSTAPD_CHAN_DISABLED)) 747 return 1; 748 } 749 } 750 751 return 0; 752} 753 754 755static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s) 756{ 757 int *freqs; 758 int num_freqs = 0; 759 unsigned int i; 760 761 if (!wpa_s->wnm_neighbor_report_elements) 762 return; 763 764 if (wpa_s->hw.modes == NULL) 765 return; 766 767 os_free(wpa_s->next_scan_freqs); 768 wpa_s->next_scan_freqs = NULL; 769 770 freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int)); 771 if (freqs == NULL) 772 return; 773 774 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) { 775 struct neighbor_report *nei; 776 777 nei = &wpa_s->wnm_neighbor_report_elements[i]; 778 if (nei->freq <= 0) { 779 wpa_printf(MSG_DEBUG, 780 "WNM: Unknown neighbor operating frequency for " 781 MACSTR " - scan all channels", 782 MAC2STR(nei->bssid)); 783 os_free(freqs); 784 return; 785 } 786 if (chan_supported(wpa_s, nei->freq)) 787 add_freq(freqs, &num_freqs, nei->freq); 788 } 789 790 if (num_freqs == 0) { 791 os_free(freqs); 792 return; 793 } 794 795 wpa_printf(MSG_DEBUG, 796 "WNM: Scan %d frequencies based on transition candidate list", 797 num_freqs); 798 wpa_s->next_scan_freqs = freqs; 799} 800 801 802static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s, 803 const u8 *pos, const u8 *end, 804 int reply) 805{ 806 unsigned int beacon_int; 807 u8 valid_int; 808 809 if (pos + 5 > end) 810 return; 811 812 if (wpa_s->current_bss) 813 beacon_int = wpa_s->current_bss->beacon_int; 814 else 815 beacon_int = 100; /* best guess */ 816 817 wpa_s->wnm_dialog_token = pos[0]; 818 wpa_s->wnm_mode = pos[1]; 819 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2); 820 valid_int = pos[4]; 821 wpa_s->wnm_reply = reply; 822 823 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: " 824 "dialog_token=%u request_mode=0x%x " 825 "disassoc_timer=%u validity_interval=%u", 826 wpa_s->wnm_dialog_token, wpa_s->wnm_mode, 827 wpa_s->wnm_dissoc_timer, valid_int); 828 829 pos += 5; 830 831 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) { 832 if (pos + 12 > end) { 833 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request"); 834 return; 835 } 836 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12); 837 pos += 12; /* BSS Termination Duration */ 838 } 839 840 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) { 841 char url[256]; 842 843 if (pos + 1 > end || pos + 1 + pos[0] > end) { 844 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition " 845 "Management Request (URL)"); 846 return; 847 } 848 os_memcpy(url, pos + 1, pos[0]); 849 url[pos[0]] = '\0'; 850 pos += 1 + pos[0]; 851 852 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s", 853 wpa_sm_pmf_enabled(wpa_s->wpa), 854 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url); 855 } 856 857 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) { 858 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - " 859 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer); 860 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) { 861 /* TODO: mark current BSS less preferred for 862 * selection */ 863 wpa_printf(MSG_DEBUG, "Trying to find another BSS"); 864 wpa_supplicant_req_scan(wpa_s, 0, 0); 865 } 866 } 867 868 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) { 869 unsigned int valid_ms; 870 871 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available"); 872 wnm_deallocate_memory(wpa_s); 873 wpa_s->wnm_neighbor_report_elements = os_calloc( 874 WNM_MAX_NEIGHBOR_REPORT, 875 sizeof(struct neighbor_report)); 876 if (wpa_s->wnm_neighbor_report_elements == NULL) 877 return; 878 879 while (pos + 2 <= end && 880 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT) 881 { 882 u8 tag = *pos++; 883 u8 len = *pos++; 884 885 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u", 886 tag); 887 if (pos + len > end) { 888 wpa_printf(MSG_DEBUG, "WNM: Truncated request"); 889 return; 890 } 891 if (tag == WLAN_EID_NEIGHBOR_REPORT) { 892 struct neighbor_report *rep; 893 rep = &wpa_s->wnm_neighbor_report_elements[ 894 wpa_s->wnm_num_neighbor_report]; 895 wnm_parse_neighbor_report(wpa_s, pos, len, rep); 896 } 897 898 pos += len; 899 wpa_s->wnm_num_neighbor_report++; 900 } 901 wnm_sort_cand_list(wpa_s); 902 wnm_dump_cand_list(wpa_s); 903 valid_ms = valid_int * beacon_int * 128 / 125; 904 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms", 905 valid_ms); 906 os_get_reltime(&wpa_s->wnm_cand_valid_until); 907 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000; 908 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000; 909 wpa_s->wnm_cand_valid_until.sec += 910 wpa_s->wnm_cand_valid_until.usec / 1000000; 911 wpa_s->wnm_cand_valid_until.usec %= 1000000; 912 os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN); 913 914 if (wpa_s->last_scan_res_used > 0) { 915 struct os_reltime now; 916 917 os_get_reltime(&now); 918 if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) { 919 wpa_printf(MSG_DEBUG, 920 "WNM: Try to use recent scan results"); 921 if (wnm_scan_process(wpa_s, 0) > 0) 922 return; 923 wpa_printf(MSG_DEBUG, 924 "WNM: No match in previous scan results - try a new scan"); 925 } 926 } 927 928 wnm_set_scan_freqs(wpa_s); 929 wpa_supplicant_req_scan(wpa_s, 0, 0); 930 } else if (reply) { 931 enum bss_trans_mgmt_status_code status; 932 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) 933 status = WNM_BSS_TM_ACCEPT; 934 else { 935 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates"); 936 status = WNM_BSS_TM_REJECT_UNSPECIFIED; 937 } 938 wnm_send_bss_transition_mgmt_resp(wpa_s, 939 wpa_s->wnm_dialog_token, 940 status, 0, NULL); 941 } 942} 943 944 945int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s, 946 u8 query_reason) 947{ 948 u8 buf[1000], *pos; 949 struct ieee80211_mgmt *mgmt; 950 size_t len; 951 int ret; 952 953 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to " 954 MACSTR " query_reason=%u", 955 MAC2STR(wpa_s->bssid), query_reason); 956 957 mgmt = (struct ieee80211_mgmt *) buf; 958 os_memset(&buf, 0, sizeof(buf)); 959 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN); 960 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN); 961 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN); 962 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 963 WLAN_FC_STYPE_ACTION); 964 mgmt->u.action.category = WLAN_ACTION_WNM; 965 mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY; 966 mgmt->u.action.u.bss_tm_query.dialog_token = 1; 967 mgmt->u.action.u.bss_tm_query.query_reason = query_reason; 968 pos = mgmt->u.action.u.bss_tm_query.variable; 969 970 len = pos - (u8 *) &mgmt->u.action.category; 971 972 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid, 973 wpa_s->own_addr, wpa_s->bssid, 974 &mgmt->u.action.category, len, 0); 975 976 return ret; 977} 978 979 980static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s, 981 const u8 *sa, const u8 *data, 982 int len) 983{ 984 const u8 *pos, *end, *next; 985 u8 ie, ie_len; 986 987 pos = data; 988 end = data + len; 989 990 while (pos + 1 < end) { 991 ie = *pos++; 992 ie_len = *pos++; 993 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u", 994 ie, ie_len); 995 if (ie_len > end - pos) { 996 wpa_printf(MSG_DEBUG, "WNM: Not enough room for " 997 "subelement"); 998 break; 999 } 1000 next = pos + ie_len; 1001 if (ie_len < 4) { 1002 pos = next; 1003 continue; 1004 } 1005 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u", 1006 WPA_GET_BE24(pos), pos[3]); 1007 1008#ifdef CONFIG_HS20 1009 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 && 1010 WPA_GET_BE24(pos) == OUI_WFA && 1011 pos[3] == HS20_WNM_SUB_REM_NEEDED) { 1012 /* Subscription Remediation subelement */ 1013 const u8 *ie_end; 1014 u8 url_len; 1015 char *url; 1016 u8 osu_method; 1017 1018 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation " 1019 "subelement"); 1020 ie_end = pos + ie_len; 1021 pos += 4; 1022 url_len = *pos++; 1023 if (url_len == 0) { 1024 wpa_printf(MSG_DEBUG, "WNM: No Server URL included"); 1025 url = NULL; 1026 osu_method = 1; 1027 } else { 1028 if (pos + url_len + 1 > ie_end) { 1029 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)", 1030 url_len, 1031 (int) (ie_end - pos)); 1032 break; 1033 } 1034 url = os_malloc(url_len + 1); 1035 if (url == NULL) 1036 break; 1037 os_memcpy(url, pos, url_len); 1038 url[url_len] = '\0'; 1039 osu_method = pos[url_len]; 1040 } 1041 hs20_rx_subscription_remediation(wpa_s, url, 1042 osu_method); 1043 os_free(url); 1044 pos = next; 1045 continue; 1046 } 1047 1048 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 && 1049 WPA_GET_BE24(pos) == OUI_WFA && 1050 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) { 1051 const u8 *ie_end; 1052 u8 url_len; 1053 char *url; 1054 u8 code; 1055 u16 reauth_delay; 1056 1057 ie_end = pos + ie_len; 1058 pos += 4; 1059 code = *pos++; 1060 reauth_delay = WPA_GET_LE16(pos); 1061 pos += 2; 1062 url_len = *pos++; 1063 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication " 1064 "Imminent - Reason Code %u " 1065 "Re-Auth Delay %u URL Length %u", 1066 code, reauth_delay, url_len); 1067 if (pos + url_len > ie_end) 1068 break; 1069 url = os_malloc(url_len + 1); 1070 if (url == NULL) 1071 break; 1072 os_memcpy(url, pos, url_len); 1073 url[url_len] = '\0'; 1074 hs20_rx_deauth_imminent_notice(wpa_s, code, 1075 reauth_delay, url); 1076 os_free(url); 1077 pos = next; 1078 continue; 1079 } 1080#endif /* CONFIG_HS20 */ 1081 1082 pos = next; 1083 } 1084} 1085 1086 1087static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s, 1088 const u8 *sa, const u8 *frm, int len) 1089{ 1090 const u8 *pos, *end; 1091 u8 dialog_token, type; 1092 1093 /* Dialog Token [1] | Type [1] | Subelements */ 1094 1095 if (len < 2 || sa == NULL) 1096 return; 1097 end = frm + len; 1098 pos = frm; 1099 dialog_token = *pos++; 1100 type = *pos++; 1101 1102 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request " 1103 "(dialog_token %u type %u sa " MACSTR ")", 1104 dialog_token, type, MAC2STR(sa)); 1105 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements", 1106 pos, end - pos); 1107 1108 if (wpa_s->wpa_state != WPA_COMPLETED || 1109 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) { 1110 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not " 1111 "from our AP - ignore it"); 1112 return; 1113 } 1114 1115 switch (type) { 1116 case 1: 1117 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos); 1118 break; 1119 default: 1120 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown " 1121 "WNM-Notification type %u", type); 1122 break; 1123 } 1124} 1125 1126 1127void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s, 1128 const struct ieee80211_mgmt *mgmt, size_t len) 1129{ 1130 const u8 *pos, *end; 1131 u8 act; 1132 1133 if (len < IEEE80211_HDRLEN + 2) 1134 return; 1135 1136 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1; 1137 act = *pos++; 1138 end = ((const u8 *) mgmt) + len; 1139 1140 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR, 1141 act, MAC2STR(mgmt->sa)); 1142 if (wpa_s->wpa_state < WPA_ASSOCIATED || 1143 os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) { 1144 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action " 1145 "frame"); 1146 return; 1147 } 1148 1149 switch (act) { 1150 case WNM_BSS_TRANS_MGMT_REQ: 1151 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end, 1152 !(mgmt->da[0] & 0x01)); 1153 break; 1154 case WNM_SLEEP_MODE_RESP: 1155 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos); 1156 break; 1157 case WNM_NOTIFICATION_REQ: 1158 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos); 1159 break; 1160 default: 1161 wpa_printf(MSG_ERROR, "WNM: Unknown request"); 1162 break; 1163 } 1164} 1165