Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic advertisement service (GAS) server |
| 3 | * Copyright (c) 2011-2012, 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 "includes.h" |
| 10 | |
| 11 | #include "common.h" |
| 12 | #include "common/ieee802_11_defs.h" |
| 13 | #include "common/gas.h" |
| 14 | #include "utils/eloop.h" |
| 15 | #include "hostapd.h" |
| 16 | #include "ap_config.h" |
| 17 | #include "ap_drv_ops.h" |
| 18 | #include "sta_info.h" |
| 19 | #include "gas_serv.h" |
| 20 | |
| 21 | |
| 22 | static struct gas_dialog_info * |
| 23 | gas_dialog_create(struct hostapd_data *hapd, const u8 *addr, u8 dialog_token) |
| 24 | { |
| 25 | struct sta_info *sta; |
| 26 | struct gas_dialog_info *dia = NULL; |
| 27 | int i, j; |
| 28 | |
| 29 | sta = ap_get_sta(hapd, addr); |
| 30 | if (!sta) { |
| 31 | /* |
| 32 | * We need a STA entry to be able to maintain state for |
| 33 | * the GAS query. |
| 34 | */ |
| 35 | wpa_printf(MSG_DEBUG, "ANQP: Add a temporary STA entry for " |
| 36 | "GAS query"); |
| 37 | sta = ap_sta_add(hapd, addr); |
| 38 | if (!sta) { |
| 39 | wpa_printf(MSG_DEBUG, "Failed to add STA " MACSTR |
| 40 | " for GAS query", MAC2STR(addr)); |
| 41 | return NULL; |
| 42 | } |
| 43 | sta->flags |= WLAN_STA_GAS; |
| 44 | /* |
| 45 | * The default inactivity is 300 seconds. We don't need |
| 46 | * it to be that long. |
| 47 | */ |
| 48 | ap_sta_session_timeout(hapd, sta, 5); |
| 49 | } |
| 50 | |
| 51 | if (sta->gas_dialog == NULL) { |
| 52 | sta->gas_dialog = os_zalloc(GAS_DIALOG_MAX * |
| 53 | sizeof(struct gas_dialog_info)); |
| 54 | if (sta->gas_dialog == NULL) |
| 55 | return NULL; |
| 56 | } |
| 57 | |
| 58 | for (i = sta->gas_dialog_next, j = 0; j < GAS_DIALOG_MAX; i++, j++) { |
| 59 | if (i == GAS_DIALOG_MAX) |
| 60 | i = 0; |
| 61 | if (sta->gas_dialog[i].valid) |
| 62 | continue; |
| 63 | dia = &sta->gas_dialog[i]; |
| 64 | dia->valid = 1; |
| 65 | dia->index = i; |
| 66 | dia->dialog_token = dialog_token; |
| 67 | sta->gas_dialog_next = (++i == GAS_DIALOG_MAX) ? 0 : i; |
| 68 | return dia; |
| 69 | } |
| 70 | |
| 71 | wpa_msg(hapd->msg_ctx, MSG_ERROR, "ANQP: Could not create dialog for " |
| 72 | MACSTR " dialog_token %u. Consider increasing " |
| 73 | "GAS_DIALOG_MAX.", MAC2STR(addr), dialog_token); |
| 74 | |
| 75 | return NULL; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | struct gas_dialog_info * |
| 80 | gas_serv_dialog_find(struct hostapd_data *hapd, const u8 *addr, |
| 81 | u8 dialog_token) |
| 82 | { |
| 83 | struct sta_info *sta; |
| 84 | int i; |
| 85 | |
| 86 | sta = ap_get_sta(hapd, addr); |
| 87 | if (!sta) { |
| 88 | wpa_printf(MSG_DEBUG, "ANQP: could not find STA " MACSTR, |
| 89 | MAC2STR(addr)); |
| 90 | return NULL; |
| 91 | } |
| 92 | for (i = 0; sta->gas_dialog && i < GAS_DIALOG_MAX; i++) { |
| 93 | if (sta->gas_dialog[i].dialog_token != dialog_token || |
| 94 | !sta->gas_dialog[i].valid) |
| 95 | continue; |
| 96 | return &sta->gas_dialog[i]; |
| 97 | } |
| 98 | wpa_printf(MSG_DEBUG, "ANQP: Could not find dialog for " |
| 99 | MACSTR " dialog_token %u", MAC2STR(addr), dialog_token); |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | |
| 104 | void gas_serv_dialog_clear(struct gas_dialog_info *dia) |
| 105 | { |
| 106 | wpabuf_free(dia->sd_resp); |
| 107 | os_memset(dia, 0, sizeof(*dia)); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | static void gas_serv_free_dialogs(struct hostapd_data *hapd, |
| 112 | const u8 *sta_addr) |
| 113 | { |
| 114 | struct sta_info *sta; |
| 115 | int i; |
| 116 | |
| 117 | sta = ap_get_sta(hapd, sta_addr); |
| 118 | if (sta == NULL || sta->gas_dialog == NULL) |
| 119 | return; |
| 120 | |
| 121 | for (i = 0; i < GAS_DIALOG_MAX; i++) { |
| 122 | if (sta->gas_dialog[i].valid) |
| 123 | return; |
| 124 | } |
| 125 | |
| 126 | os_free(sta->gas_dialog); |
| 127 | sta->gas_dialog = NULL; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | static void anqp_add_capab_list(struct hostapd_data *hapd, |
| 132 | struct wpabuf *buf) |
| 133 | { |
| 134 | u8 *len; |
| 135 | |
| 136 | len = gas_anqp_add_element(buf, ANQP_CAPABILITY_LIST); |
| 137 | wpabuf_put_le16(buf, ANQP_CAPABILITY_LIST); |
| 138 | if (hapd->conf->venue_name) |
| 139 | wpabuf_put_le16(buf, ANQP_VENUE_NAME); |
| 140 | if (hapd->conf->roaming_consortium) |
| 141 | wpabuf_put_le16(buf, ANQP_ROAMING_CONSORTIUM); |
| 142 | gas_anqp_set_element_len(buf, len); |
| 143 | } |
| 144 | |
| 145 | |
| 146 | static void anqp_add_venue_name(struct hostapd_data *hapd, struct wpabuf *buf) |
| 147 | { |
| 148 | if (hapd->conf->venue_name) { |
| 149 | u8 *len; |
| 150 | unsigned int i; |
| 151 | len = gas_anqp_add_element(buf, ANQP_VENUE_NAME); |
| 152 | wpabuf_put_u8(buf, hapd->conf->venue_group); |
| 153 | wpabuf_put_u8(buf, hapd->conf->venue_type); |
| 154 | for (i = 0; i < hapd->conf->venue_name_count; i++) { |
| 155 | struct hostapd_venue_name *vn; |
| 156 | vn = &hapd->conf->venue_name[i]; |
| 157 | wpabuf_put_u8(buf, 3 + vn->name_len); |
| 158 | wpabuf_put_data(buf, vn->lang, 3); |
| 159 | wpabuf_put_data(buf, vn->name, vn->name_len); |
| 160 | } |
| 161 | gas_anqp_set_element_len(buf, len); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | |
| 166 | static void anqp_add_roaming_consortium(struct hostapd_data *hapd, |
| 167 | struct wpabuf *buf) |
| 168 | { |
| 169 | unsigned int i; |
| 170 | u8 *len; |
| 171 | |
| 172 | len = gas_anqp_add_element(buf, ANQP_ROAMING_CONSORTIUM); |
| 173 | for (i = 0; i < hapd->conf->roaming_consortium_count; i++) { |
| 174 | struct hostapd_roaming_consortium *rc; |
| 175 | rc = &hapd->conf->roaming_consortium[i]; |
| 176 | wpabuf_put_u8(buf, rc->len); |
| 177 | wpabuf_put_data(buf, rc->oi, rc->len); |
| 178 | } |
| 179 | gas_anqp_set_element_len(buf, len); |
| 180 | } |
| 181 | |
| 182 | |
| 183 | static struct wpabuf * |
| 184 | gas_serv_build_gas_resp_payload(struct hostapd_data *hapd, |
| 185 | unsigned int request, |
| 186 | struct gas_dialog_info *di) |
| 187 | { |
| 188 | struct wpabuf *buf; |
| 189 | |
| 190 | buf = wpabuf_alloc(1400); |
| 191 | if (buf == NULL) |
| 192 | return NULL; |
| 193 | |
| 194 | if (request & ANQP_REQ_CAPABILITY_LIST) |
| 195 | anqp_add_capab_list(hapd, buf); |
| 196 | if (request & ANQP_REQ_VENUE_NAME) |
| 197 | anqp_add_venue_name(hapd, buf); |
| 198 | if (request & ANQP_REQ_ROAMING_CONSORTIUM) |
| 199 | anqp_add_roaming_consortium(hapd, buf); |
| 200 | |
| 201 | return buf; |
| 202 | } |
| 203 | |
| 204 | |
| 205 | static void gas_serv_clear_cached_ies(void *eloop_data, void *user_ctx) |
| 206 | { |
| 207 | struct gas_dialog_info *dia = eloop_data; |
| 208 | |
| 209 | wpa_printf(MSG_DEBUG, "GAS: Timeout triggered, clearing dialog for " |
| 210 | "dialog token %d", dia->dialog_token); |
| 211 | |
| 212 | gas_serv_dialog_clear(dia); |
| 213 | } |
| 214 | |
| 215 | |
| 216 | struct anqp_query_info { |
| 217 | unsigned int request; |
| 218 | unsigned int remote_request; |
| 219 | const void *param; |
| 220 | u32 param_arg; |
| 221 | u16 remote_delay; |
| 222 | }; |
| 223 | |
| 224 | |
| 225 | static void set_anqp_req(unsigned int bit, const char *name, int local, |
| 226 | unsigned int remote, u16 remote_delay, |
| 227 | struct anqp_query_info *qi) |
| 228 | { |
| 229 | qi->request |= bit; |
| 230 | if (local) { |
| 231 | wpa_printf(MSG_DEBUG, "ANQP: %s (local)", name); |
| 232 | } else if (bit & remote) { |
| 233 | wpa_printf(MSG_DEBUG, "ANQP: %s (remote)", name); |
| 234 | qi->remote_request |= bit; |
| 235 | if (remote_delay > qi->remote_delay) |
| 236 | qi->remote_delay = remote_delay; |
| 237 | } else { |
| 238 | wpa_printf(MSG_DEBUG, "ANQP: %s not available", name); |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | |
| 243 | static void rx_anqp_query_list_id(struct hostapd_data *hapd, u16 info_id, |
| 244 | struct anqp_query_info *qi) |
| 245 | { |
| 246 | switch (info_id) { |
| 247 | case ANQP_CAPABILITY_LIST: |
| 248 | set_anqp_req(ANQP_REQ_CAPABILITY_LIST, "Capability List", 1, 0, |
| 249 | 0, qi); |
| 250 | break; |
| 251 | case ANQP_VENUE_NAME: |
| 252 | set_anqp_req(ANQP_REQ_VENUE_NAME, "Venue Name", |
| 253 | hapd->conf->venue_name != NULL, 0, 0, qi); |
| 254 | break; |
| 255 | case ANQP_ROAMING_CONSORTIUM: |
| 256 | set_anqp_req(ANQP_REQ_ROAMING_CONSORTIUM, "Roaming Consortium", |
| 257 | hapd->conf->roaming_consortium != NULL, 0, 0, qi); |
| 258 | break; |
| 259 | default: |
| 260 | wpa_printf(MSG_DEBUG, "ANQP: Unsupported Info Id %u", |
| 261 | info_id); |
| 262 | break; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | |
| 267 | static void rx_anqp_query_list(struct hostapd_data *hapd, |
| 268 | const u8 *pos, const u8 *end, |
| 269 | struct anqp_query_info *qi) |
| 270 | { |
| 271 | wpa_printf(MSG_DEBUG, "ANQP: %u Info IDs requested in Query list", |
| 272 | (unsigned int) (end - pos) / 2); |
| 273 | |
| 274 | while (pos + 2 <= end) { |
| 275 | rx_anqp_query_list_id(hapd, WPA_GET_LE16(pos), qi); |
| 276 | pos += 2; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | |
| 281 | static void gas_serv_req_local_processing(struct hostapd_data *hapd, |
| 282 | const u8 *sa, u8 dialog_token, |
| 283 | struct anqp_query_info *qi) |
| 284 | { |
| 285 | struct wpabuf *buf, *tx_buf; |
| 286 | |
| 287 | buf = gas_serv_build_gas_resp_payload(hapd, qi->request, NULL); |
| 288 | wpa_hexdump_buf(MSG_MSGDUMP, "ANQP: Locally generated ANQP responses", |
| 289 | buf); |
| 290 | if (!buf) |
| 291 | return; |
| 292 | |
| 293 | if (wpabuf_len(buf) > hapd->gas_frag_limit || |
| 294 | hapd->conf->gas_comeback_delay) { |
| 295 | struct gas_dialog_info *di; |
| 296 | u16 comeback_delay = 1; |
| 297 | |
| 298 | if (hapd->conf->gas_comeback_delay) { |
| 299 | /* Testing - allow overriding of the delay value */ |
| 300 | comeback_delay = hapd->conf->gas_comeback_delay; |
| 301 | } |
| 302 | |
| 303 | wpa_printf(MSG_DEBUG, "ANQP: Too long response to fit in " |
| 304 | "initial response - use GAS comeback"); |
| 305 | di = gas_dialog_create(hapd, sa, dialog_token); |
| 306 | if (!di) { |
| 307 | wpa_printf(MSG_INFO, "ANQP: Could not create dialog " |
| 308 | "for " MACSTR " (dialog token %u)", |
| 309 | MAC2STR(sa), dialog_token); |
| 310 | wpabuf_free(buf); |
| 311 | return; |
| 312 | } |
| 313 | di->sd_resp = buf; |
| 314 | di->sd_resp_pos = 0; |
| 315 | tx_buf = gas_anqp_build_initial_resp_buf( |
| 316 | dialog_token, WLAN_STATUS_SUCCESS, comeback_delay, |
| 317 | NULL); |
| 318 | } else { |
| 319 | wpa_printf(MSG_DEBUG, "ANQP: Initial response (no comeback)"); |
| 320 | tx_buf = gas_anqp_build_initial_resp_buf( |
| 321 | dialog_token, WLAN_STATUS_SUCCESS, 0, buf); |
| 322 | wpabuf_free(buf); |
| 323 | } |
| 324 | if (!tx_buf) |
| 325 | return; |
| 326 | |
| 327 | hostapd_drv_send_action(hapd, hapd->iface->freq, 0, sa, |
| 328 | wpabuf_head(tx_buf), wpabuf_len(tx_buf)); |
| 329 | wpabuf_free(tx_buf); |
| 330 | } |
| 331 | |
| 332 | |
| 333 | static void gas_serv_rx_gas_initial_req(struct hostapd_data *hapd, |
| 334 | const u8 *sa, |
| 335 | const u8 *data, size_t len) |
| 336 | { |
| 337 | const u8 *pos = data; |
| 338 | const u8 *end = data + len; |
| 339 | const u8 *next; |
| 340 | u8 dialog_token; |
| 341 | u16 slen; |
| 342 | struct anqp_query_info qi; |
| 343 | const u8 *adv_proto; |
| 344 | |
| 345 | if (len < 1 + 2) |
| 346 | return; |
| 347 | |
| 348 | os_memset(&qi, 0, sizeof(qi)); |
| 349 | |
| 350 | dialog_token = *pos++; |
| 351 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, |
| 352 | "GAS: GAS Initial Request from " MACSTR " (dialog token %u) ", |
| 353 | MAC2STR(sa), dialog_token); |
| 354 | |
| 355 | if (*pos != WLAN_EID_ADV_PROTO) { |
| 356 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, |
| 357 | "GAS: Unexpected IE in GAS Initial Request: %u", *pos); |
| 358 | return; |
| 359 | } |
| 360 | adv_proto = pos++; |
| 361 | |
| 362 | slen = *pos++; |
| 363 | next = pos + slen; |
| 364 | if (next > end || slen < 2) { |
| 365 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, |
| 366 | "GAS: Invalid IE in GAS Initial Request"); |
| 367 | return; |
| 368 | } |
| 369 | pos++; /* skip QueryRespLenLimit and PAME-BI */ |
| 370 | |
| 371 | if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) { |
| 372 | struct wpabuf *buf; |
| 373 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, |
| 374 | "GAS: Unsupported GAS advertisement protocol id %u", |
| 375 | *pos); |
| 376 | if (sa[0] & 0x01) |
| 377 | return; /* Invalid source address - drop silently */ |
| 378 | buf = gas_build_initial_resp( |
| 379 | dialog_token, WLAN_STATUS_GAS_ADV_PROTO_NOT_SUPPORTED, |
| 380 | 0, 2 + slen + 2); |
| 381 | if (buf == NULL) |
| 382 | return; |
| 383 | wpabuf_put_data(buf, adv_proto, 2 + slen); |
| 384 | wpabuf_put_le16(buf, 0); /* Query Response Length */ |
| 385 | hostapd_drv_send_action(hapd, hapd->iface->freq, 0, sa, |
| 386 | wpabuf_head(buf), wpabuf_len(buf)); |
| 387 | wpabuf_free(buf); |
| 388 | return; |
| 389 | } |
| 390 | |
| 391 | pos = next; |
| 392 | /* Query Request */ |
| 393 | if (pos + 2 > end) |
| 394 | return; |
| 395 | slen = WPA_GET_LE16(pos); |
| 396 | pos += 2; |
| 397 | if (pos + slen > end) |
| 398 | return; |
| 399 | end = pos + slen; |
| 400 | |
| 401 | /* ANQP Query Request */ |
| 402 | while (pos < end) { |
| 403 | u16 info_id, elen; |
| 404 | |
| 405 | if (pos + 4 > end) |
| 406 | return; |
| 407 | |
| 408 | info_id = WPA_GET_LE16(pos); |
| 409 | pos += 2; |
| 410 | elen = WPA_GET_LE16(pos); |
| 411 | pos += 2; |
| 412 | |
| 413 | if (pos + elen > end) { |
| 414 | wpa_printf(MSG_DEBUG, "ANQP: Invalid Query Request"); |
| 415 | return; |
| 416 | } |
| 417 | |
| 418 | switch (info_id) { |
| 419 | case ANQP_QUERY_LIST: |
| 420 | rx_anqp_query_list(hapd, pos, pos + elen, &qi); |
| 421 | break; |
| 422 | default: |
| 423 | wpa_printf(MSG_DEBUG, "ANQP: Unsupported Query " |
| 424 | "Request element %u", info_id); |
| 425 | break; |
| 426 | } |
| 427 | |
| 428 | pos += elen; |
| 429 | } |
| 430 | |
| 431 | gas_serv_req_local_processing(hapd, sa, dialog_token, &qi); |
| 432 | } |
| 433 | |
| 434 | |
| 435 | void gas_serv_tx_gas_response(struct hostapd_data *hapd, const u8 *dst, |
| 436 | struct gas_dialog_info *dialog) |
| 437 | { |
| 438 | struct wpabuf *buf, *tx_buf; |
| 439 | u8 dialog_token = dialog->dialog_token; |
| 440 | size_t frag_len; |
| 441 | |
| 442 | if (dialog->sd_resp == NULL) { |
| 443 | buf = gas_serv_build_gas_resp_payload(hapd, |
| 444 | dialog->all_requested, |
| 445 | dialog); |
| 446 | wpa_hexdump_buf(MSG_MSGDUMP, "ANQP: Generated ANQP responses", |
| 447 | buf); |
| 448 | if (!buf) |
| 449 | goto tx_gas_response_done; |
| 450 | dialog->sd_resp = buf; |
| 451 | dialog->sd_resp_pos = 0; |
| 452 | } |
| 453 | frag_len = wpabuf_len(dialog->sd_resp) - dialog->sd_resp_pos; |
| 454 | if (frag_len > hapd->gas_frag_limit || dialog->comeback_delay || |
| 455 | hapd->conf->gas_comeback_delay) { |
| 456 | u16 comeback_delay_tus = dialog->comeback_delay + |
| 457 | GAS_SERV_COMEBACK_DELAY_FUDGE; |
| 458 | u32 comeback_delay_secs, comeback_delay_usecs; |
| 459 | |
| 460 | if (hapd->conf->gas_comeback_delay) { |
| 461 | /* Testing - allow overriding of the delay value */ |
| 462 | comeback_delay_tus = hapd->conf->gas_comeback_delay; |
| 463 | } |
| 464 | |
| 465 | wpa_printf(MSG_DEBUG, "GAS: Response frag_len %u (frag limit " |
| 466 | "%u) and comeback delay %u, " |
| 467 | "requesting comebacks", (unsigned int) frag_len, |
| 468 | (unsigned int) hapd->gas_frag_limit, |
| 469 | dialog->comeback_delay); |
| 470 | tx_buf = gas_anqp_build_initial_resp_buf(dialog_token, |
| 471 | WLAN_STATUS_SUCCESS, |
| 472 | comeback_delay_tus, |
| 473 | NULL); |
| 474 | if (tx_buf) { |
| 475 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, |
| 476 | "GAS: Tx GAS Initial Resp (comeback = 10TU)"); |
| 477 | hostapd_drv_send_action(hapd, hapd->iface->freq, 0, |
| 478 | dst, |
| 479 | wpabuf_head(tx_buf), |
| 480 | wpabuf_len(tx_buf)); |
| 481 | } |
| 482 | wpabuf_free(tx_buf); |
| 483 | |
| 484 | /* start a timer of 1.5 * comeback-delay */ |
| 485 | comeback_delay_tus = comeback_delay_tus + |
| 486 | (comeback_delay_tus / 2); |
| 487 | comeback_delay_secs = (comeback_delay_tus * 1024) / 1000000; |
| 488 | comeback_delay_usecs = (comeback_delay_tus * 1024) - |
| 489 | (comeback_delay_secs * 1000000); |
| 490 | eloop_register_timeout(comeback_delay_secs, |
| 491 | comeback_delay_usecs, |
| 492 | gas_serv_clear_cached_ies, dialog, |
| 493 | NULL); |
| 494 | goto tx_gas_response_done; |
| 495 | } |
| 496 | |
| 497 | buf = wpabuf_alloc_copy(wpabuf_head_u8(dialog->sd_resp) + |
| 498 | dialog->sd_resp_pos, frag_len); |
| 499 | if (buf == NULL) { |
| 500 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Buffer allocation " |
| 501 | "failed"); |
| 502 | goto tx_gas_response_done; |
| 503 | } |
| 504 | tx_buf = gas_anqp_build_initial_resp_buf(dialog_token, |
| 505 | WLAN_STATUS_SUCCESS, 0, buf); |
| 506 | wpabuf_free(buf); |
| 507 | if (tx_buf == NULL) |
| 508 | goto tx_gas_response_done; |
| 509 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Tx GAS Initial " |
| 510 | "Response (frag_id %d frag_len %d)", |
| 511 | dialog->sd_frag_id, (int) frag_len); |
| 512 | dialog->sd_frag_id++; |
| 513 | |
| 514 | hostapd_drv_send_action(hapd, hapd->iface->freq, 0, dst, |
| 515 | wpabuf_head(tx_buf), wpabuf_len(tx_buf)); |
| 516 | wpabuf_free(tx_buf); |
| 517 | tx_gas_response_done: |
| 518 | gas_serv_clear_cached_ies(dialog, NULL); |
| 519 | } |
| 520 | |
| 521 | |
| 522 | static void gas_serv_rx_gas_comeback_req(struct hostapd_data *hapd, |
| 523 | const u8 *sa, |
| 524 | const u8 *data, size_t len) |
| 525 | { |
| 526 | struct gas_dialog_info *dialog; |
| 527 | struct wpabuf *buf, *tx_buf; |
| 528 | u8 dialog_token; |
| 529 | size_t frag_len; |
| 530 | int more = 0; |
| 531 | |
| 532 | wpa_hexdump(MSG_DEBUG, "GAS: RX GAS Comeback Request", data, len); |
| 533 | if (len < 1) |
| 534 | return; |
| 535 | dialog_token = *data; |
| 536 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Dialog Token: %u", |
| 537 | dialog_token); |
| 538 | |
| 539 | dialog = gas_serv_dialog_find(hapd, sa, dialog_token); |
| 540 | if (!dialog) { |
| 541 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: No pending SD " |
| 542 | "response fragment for " MACSTR " dialog token %u", |
| 543 | MAC2STR(sa), dialog_token); |
| 544 | |
| 545 | if (sa[0] & 0x01) |
| 546 | return; /* Invalid source address - drop silently */ |
| 547 | tx_buf = gas_anqp_build_comeback_resp_buf( |
| 548 | dialog_token, WLAN_STATUS_NO_OUTSTANDING_GAS_REQ, 0, 0, |
| 549 | 0, NULL); |
| 550 | if (tx_buf == NULL) |
| 551 | return; |
| 552 | goto send_resp; |
| 553 | } |
| 554 | |
| 555 | if (dialog->sd_resp == NULL) { |
| 556 | wpa_printf(MSG_DEBUG, "GAS: Remote request 0x%x received 0x%x", |
| 557 | dialog->requested, dialog->received); |
| 558 | if ((dialog->requested & dialog->received) != |
| 559 | dialog->requested) { |
| 560 | wpa_printf(MSG_DEBUG, "GAS: Did not receive response " |
| 561 | "from remote processing"); |
| 562 | gas_serv_dialog_clear(dialog); |
| 563 | tx_buf = gas_anqp_build_comeback_resp_buf( |
| 564 | dialog_token, |
| 565 | WLAN_STATUS_GAS_RESP_NOT_RECEIVED, 0, 0, 0, |
| 566 | NULL); |
| 567 | if (tx_buf == NULL) |
| 568 | return; |
| 569 | goto send_resp; |
| 570 | } |
| 571 | |
| 572 | buf = gas_serv_build_gas_resp_payload(hapd, |
| 573 | dialog->all_requested, |
| 574 | dialog); |
| 575 | wpa_hexdump_buf(MSG_MSGDUMP, "ANQP: Generated ANQP responses", |
| 576 | buf); |
| 577 | if (!buf) |
| 578 | goto rx_gas_comeback_req_done; |
| 579 | dialog->sd_resp = buf; |
| 580 | dialog->sd_resp_pos = 0; |
| 581 | } |
| 582 | frag_len = wpabuf_len(dialog->sd_resp) - dialog->sd_resp_pos; |
| 583 | if (frag_len > hapd->gas_frag_limit) { |
| 584 | frag_len = hapd->gas_frag_limit; |
| 585 | more = 1; |
| 586 | } |
| 587 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: resp frag_len %u", |
| 588 | (unsigned int) frag_len); |
| 589 | buf = wpabuf_alloc_copy(wpabuf_head_u8(dialog->sd_resp) + |
| 590 | dialog->sd_resp_pos, frag_len); |
| 591 | if (buf == NULL) { |
| 592 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Failed to allocate " |
| 593 | "buffer"); |
| 594 | goto rx_gas_comeback_req_done; |
| 595 | } |
| 596 | tx_buf = gas_anqp_build_comeback_resp_buf(dialog_token, |
| 597 | WLAN_STATUS_SUCCESS, |
| 598 | dialog->sd_frag_id, |
| 599 | more, 0, buf); |
| 600 | wpabuf_free(buf); |
| 601 | if (tx_buf == NULL) |
| 602 | goto rx_gas_comeback_req_done; |
| 603 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Tx GAS Comeback Response " |
| 604 | "(frag_id %d more=%d frag_len=%d)", |
| 605 | dialog->sd_frag_id, more, (int) frag_len); |
| 606 | dialog->sd_frag_id++; |
| 607 | dialog->sd_resp_pos += frag_len; |
| 608 | |
| 609 | if (more) { |
| 610 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: %d more bytes remain " |
| 611 | "to be sent", |
| 612 | (int) (wpabuf_len(dialog->sd_resp) - |
| 613 | dialog->sd_resp_pos)); |
| 614 | } else { |
| 615 | wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: All fragments of " |
| 616 | "SD response sent"); |
| 617 | gas_serv_dialog_clear(dialog); |
| 618 | gas_serv_free_dialogs(hapd, sa); |
| 619 | } |
| 620 | |
| 621 | send_resp: |
| 622 | hostapd_drv_send_action(hapd, hapd->iface->freq, 0, sa, |
| 623 | wpabuf_head(tx_buf), wpabuf_len(tx_buf)); |
| 624 | wpabuf_free(tx_buf); |
| 625 | return; |
| 626 | |
| 627 | rx_gas_comeback_req_done: |
| 628 | gas_serv_clear_cached_ies(dialog, NULL); |
| 629 | } |
| 630 | |
| 631 | |
| 632 | static void gas_serv_rx_public_action(void *ctx, const u8 *buf, size_t len, |
| 633 | int freq) |
| 634 | { |
| 635 | struct hostapd_data *hapd = ctx; |
| 636 | const struct ieee80211_mgmt *mgmt; |
| 637 | size_t hdr_len; |
| 638 | const u8 *sa, *data; |
| 639 | |
| 640 | mgmt = (const struct ieee80211_mgmt *) buf; |
| 641 | hdr_len = (const u8 *) &mgmt->u.action.u.vs_public_action.action - buf; |
| 642 | if (hdr_len > len) |
| 643 | return; |
| 644 | if (mgmt->u.action.category != WLAN_ACTION_PUBLIC) |
| 645 | return; |
| 646 | sa = mgmt->sa; |
| 647 | len -= hdr_len; |
| 648 | data = &mgmt->u.action.u.public_action.action; |
| 649 | switch (data[0]) { |
| 650 | case WLAN_PA_GAS_INITIAL_REQ: |
| 651 | gas_serv_rx_gas_initial_req(hapd, sa, data + 1, len - 1); |
| 652 | break; |
| 653 | case WLAN_PA_GAS_COMEBACK_REQ: |
| 654 | gas_serv_rx_gas_comeback_req(hapd, sa, data + 1, len - 1); |
| 655 | break; |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | |
| 660 | int gas_serv_init(struct hostapd_data *hapd) |
| 661 | { |
| 662 | hapd->public_action_cb = gas_serv_rx_public_action; |
| 663 | hapd->public_action_cb_ctx = hapd; |
| 664 | hapd->gas_frag_limit = 1400; |
| 665 | if (hapd->conf->gas_frag_limit > 0) |
| 666 | hapd->gas_frag_limit = hapd->conf->gas_frag_limit; |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | |
| 671 | void gas_serv_deinit(struct hostapd_data *hapd) |
| 672 | { |
| 673 | } |