1 /* 2 * hostapd / WMM (Wi-Fi Multimedia) 3 * Copyright 2002-2003, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright (c) 2009, Jouni Malinen <j (at) w1.fi> 6 * 7 * This software may be distributed under the terms of the BSD license. 8 * See README for more details. 9 */ 10 11 #include "utils/includes.h" 12 13 #include "utils/common.h" 14 #include "common/ieee802_11_defs.h" 15 #include "common/ieee802_11_common.h" 16 #include "hostapd.h" 17 #include "ieee802_11.h" 18 #include "sta_info.h" 19 #include "ap_config.h" 20 #include "ap_drv_ops.h" 21 #include "wmm.h" 22 23 24 static inline u8 wmm_aci_aifsn(int aifsn, int acm, int aci) 25 { 26 u8 ret; 27 ret = (aifsn << WMM_AC_AIFNS_SHIFT) & WMM_AC_AIFSN_MASK; 28 if (acm) 29 ret |= WMM_AC_ACM; 30 ret |= (aci << WMM_AC_ACI_SHIFT) & WMM_AC_ACI_MASK; 31 return ret; 32 } 33 34 35 static inline u8 wmm_ecw(int ecwmin, int ecwmax) 36 { 37 return ((ecwmin << WMM_AC_ECWMIN_SHIFT) & WMM_AC_ECWMIN_MASK) | 38 ((ecwmax << WMM_AC_ECWMAX_SHIFT) & WMM_AC_ECWMAX_MASK); 39 } 40 41 42 static void 43 wmm_set_regulatory_limit(const struct hostapd_wmm_ac_params *wmm_conf, 44 struct hostapd_wmm_ac_params *wmm, 45 const struct hostapd_wmm_rule *wmm_reg) 46 { 47 int ac; 48 49 for (ac = 0; ac < WMM_AC_NUM; ac++) { 50 wmm[ac].cwmin = MAX(wmm_conf[ac].cwmin, wmm_reg[ac].min_cwmin); 51 wmm[ac].cwmax = MAX(wmm_conf[ac].cwmax, wmm_reg[ac].min_cwmax); 52 wmm[ac].aifs = MAX(wmm_conf[ac].aifs, wmm_reg[ac].min_aifs); 53 wmm[ac].txop_limit = 54 MIN(wmm_conf[ac].txop_limit, wmm_reg[ac].max_txop); 55 wmm[ac].admission_control_mandatory = 56 wmm_conf[ac].admission_control_mandatory; 57 } 58 } 59 60 61 /* 62 * Calculate WMM regulatory limit if any. 63 */ 64 static void wmm_calc_regulatory_limit(struct hostapd_data *hapd, 65 struct hostapd_wmm_ac_params *acp) 66 { 67 struct hostapd_hw_modes *mode = hapd->iface->current_mode; 68 int c; 69 70 os_memcpy(acp, hapd->iconf->wmm_ac_params, 71 sizeof(hapd->iconf->wmm_ac_params)); 72 73 for (c = 0; mode && c < mode->num_channels; c++) { 74 struct hostapd_channel_data *chan = &mode->channels[c]; 75 76 if (chan->freq != hapd->iface->freq) 77 continue; 78 79 if (chan->wmm_rules_valid) 80 wmm_set_regulatory_limit(hapd->iconf->wmm_ac_params, 81 acp, chan->wmm_rules); 82 break; 83 } 84 85 /* 86 * Check if we need to update set count. Since both were initialized to 87 * zero we can compare the whole array in one shot. 88 */ 89 if (os_memcmp(acp, hapd->iface->prev_wmm, 90 sizeof(hapd->iconf->wmm_ac_params)) != 0) { 91 os_memcpy(hapd->iface->prev_wmm, acp, 92 sizeof(hapd->iconf->wmm_ac_params)); 93 hapd->parameter_set_count++; 94 } 95 } 96 97 98 /* 99 * Add WMM Parameter Element to Beacon, Probe Response, and (Re)Association 100 * Response frames. 101 */ 102 u8 * hostapd_eid_wmm(struct hostapd_data *hapd, u8 *eid) 103 { 104 u8 *pos = eid; 105 struct wmm_parameter_element *wmm = 106 (struct wmm_parameter_element *) (pos + 2); 107 struct hostapd_wmm_ac_params wmmp[WMM_AC_NUM]; 108 int e; 109 110 os_memset(wmmp, 0, sizeof(wmmp)); 111 112 if (!hapd->conf->wmm_enabled) 113 return eid; 114 wmm_calc_regulatory_limit(hapd, wmmp); 115 eid[0] = WLAN_EID_VENDOR_SPECIFIC; 116 wmm->oui[0] = 0x00; 117 wmm->oui[1] = 0x50; 118 wmm->oui[2] = 0xf2; 119 wmm->oui_type = WMM_OUI_TYPE; 120 wmm->oui_subtype = WMM_OUI_SUBTYPE_PARAMETER_ELEMENT; 121 wmm->version = WMM_VERSION; 122 wmm->qos_info = hapd->parameter_set_count & 0xf; 123 124 if (hapd->conf->wmm_uapsd && 125 (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_UAPSD)) 126 wmm->qos_info |= 0x80; 127 128 wmm->reserved = 0; 129 130 /* fill in a parameter set record for each AC */ 131 for (e = 0; e < 4; e++) { 132 struct wmm_ac_parameter *ac = &wmm->ac[e]; 133 struct hostapd_wmm_ac_params *acp = &wmmp[e]; 134 135 ac->aci_aifsn = wmm_aci_aifsn(acp->aifs, 136 acp->admission_control_mandatory, 137 e); 138 ac->cw = wmm_ecw(acp->cwmin, acp->cwmax); 139 ac->txop_limit = host_to_le16(acp->txop_limit); 140 } 141 142 pos = (u8 *) (wmm + 1); 143 eid[1] = pos - eid - 2; /* element length */ 144 145 return pos; 146 } 147 148 149 /* 150 * This function is called when a station sends an association request with 151 * WMM info element. The function returns 1 on success or 0 on any error in WMM 152 * element. eid does not include Element ID and Length octets. 153 */ 154 int hostapd_eid_wmm_valid(struct hostapd_data *hapd, const u8 *eid, size_t len) 155 { 156 struct wmm_information_element *wmm; 157 158 wpa_hexdump(MSG_MSGDUMP, "WMM IE", eid, len); 159 160 if (len < sizeof(struct wmm_information_element)) { 161 wpa_printf(MSG_DEBUG, "Too short WMM IE (len=%lu)", 162 (unsigned long) len); 163 return 0; 164 } 165 166 wmm = (struct wmm_information_element *) eid; 167 wpa_printf(MSG_DEBUG, "Validating WMM IE: OUI %02x:%02x:%02x " 168 "OUI type %d OUI sub-type %d version %d QoS info 0x%x", 169 wmm->oui[0], wmm->oui[1], wmm->oui[2], wmm->oui_type, 170 wmm->oui_subtype, wmm->version, wmm->qos_info); 171 if (wmm->oui_subtype != WMM_OUI_SUBTYPE_INFORMATION_ELEMENT || 172 wmm->version != WMM_VERSION) { 173 wpa_printf(MSG_DEBUG, "Unsupported WMM IE Subtype/Version"); 174 return 0; 175 } 176 177 return 1; 178 } 179 180 181 static void wmm_send_action(struct hostapd_data *hapd, const u8 *addr, 182 const struct wmm_tspec_element *tspec, 183 u8 action_code, u8 dialogue_token, u8 status_code) 184 { 185 u8 buf[256]; 186 struct ieee80211_mgmt *m = (struct ieee80211_mgmt *) buf; 187 struct wmm_tspec_element *t = (struct wmm_tspec_element *) 188 m->u.action.u.wmm_action.variable; 189 int len; 190 191 hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211, 192 HOSTAPD_LEVEL_DEBUG, 193 "action response - reason %d", status_code); 194 os_memset(buf, 0, sizeof(buf)); 195 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 196 WLAN_FC_STYPE_ACTION); 197 os_memcpy(m->da, addr, ETH_ALEN); 198 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN); 199 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN); 200 m->u.action.category = WLAN_ACTION_WMM; 201 m->u.action.u.wmm_action.action_code = action_code; 202 m->u.action.u.wmm_action.dialog_token = dialogue_token; 203 m->u.action.u.wmm_action.status_code = status_code; 204 os_memcpy(t, tspec, sizeof(struct wmm_tspec_element)); 205 len = ((u8 *) (t + 1)) - buf; 206 207 if (hostapd_drv_send_mlme(hapd, m, len, 0, NULL, 0, 0) < 0) 208 wpa_printf(MSG_INFO, "wmm_send_action: send failed"); 209 } 210 211 212 int wmm_process_tspec(struct wmm_tspec_element *tspec) 213 { 214 u64 medium_time; 215 unsigned int pps, duration; 216 unsigned int up, psb, dir, tid; 217 u16 val, surplus; 218 219 up = (tspec->ts_info[1] >> 3) & 0x07; 220 psb = (tspec->ts_info[1] >> 2) & 0x01; 221 dir = (tspec->ts_info[0] >> 5) & 0x03; 222 tid = (tspec->ts_info[0] >> 1) & 0x0f; 223 wpa_printf(MSG_DEBUG, "WMM: TS Info: UP=%d PSB=%d Direction=%d TID=%d", 224 up, psb, dir, tid); 225 val = le_to_host16(tspec->nominal_msdu_size); 226 wpa_printf(MSG_DEBUG, "WMM: Nominal MSDU Size: %d%s", 227 val & 0x7fff, val & 0x8000 ? " (fixed)" : ""); 228 wpa_printf(MSG_DEBUG, "WMM: Mean Data Rate: %u bps", 229 le_to_host32(tspec->mean_data_rate)); 230 wpa_printf(MSG_DEBUG, "WMM: Minimum PHY Rate: %u bps", 231 le_to_host32(tspec->minimum_phy_rate)); 232 val = le_to_host16(tspec->surplus_bandwidth_allowance); 233 wpa_printf(MSG_DEBUG, "WMM: Surplus Bandwidth Allowance: %u.%04u", 234 val >> 13, 10000 * (val & 0x1fff) / 0x2000); 235 236 val = le_to_host16(tspec->nominal_msdu_size); 237 if (val == 0) { 238 wpa_printf(MSG_DEBUG, "WMM: Invalid Nominal MSDU Size (0)"); 239 return WMM_ADDTS_STATUS_INVALID_PARAMETERS; 240 } 241 /* pps = Ceiling((Mean Data Rate / 8) / Nominal MSDU Size) */ 242 pps = ((le_to_host32(tspec->mean_data_rate) / 8) + val - 1) / val; 243 wpa_printf(MSG_DEBUG, "WMM: Packets-per-second estimate for TSPEC: %d", 244 pps); 245 246 if (le_to_host32(tspec->minimum_phy_rate) < 1000000) { 247 wpa_printf(MSG_DEBUG, "WMM: Too small Minimum PHY Rate"); 248 return WMM_ADDTS_STATUS_INVALID_PARAMETERS; 249 } 250 251 duration = (le_to_host16(tspec->nominal_msdu_size) & 0x7fff) * 8 / 252 (le_to_host32(tspec->minimum_phy_rate) / 1000000) + 253 50 /* FIX: proper SIFS + ACK duration */; 254 255 /* unsigned binary number with an implicit binary point after the 256 * leftmost 3 bits, i.e., 0x2000 = 1.0 */ 257 surplus = le_to_host16(tspec->surplus_bandwidth_allowance); 258 if (surplus <= 0x2000) { 259 wpa_printf(MSG_DEBUG, "WMM: Surplus Bandwidth Allowance not " 260 "greater than unity"); 261 return WMM_ADDTS_STATUS_INVALID_PARAMETERS; 262 } 263 264 medium_time = (u64) surplus * pps * duration / 0x2000; 265 wpa_printf(MSG_DEBUG, "WMM: Estimated medium time: %lu", 266 (unsigned long) medium_time); 267 268 /* 269 * TODO: store list of granted (and still active) TSPECs and check 270 * whether there is available medium time for this request. For now, 271 * just refuse requests that would by themselves take very large 272 * portion of the available bandwidth. 273 */ 274 if (medium_time > 750000) { 275 wpa_printf(MSG_DEBUG, "WMM: Refuse TSPEC request for over " 276 "75%% of available bandwidth"); 277 return WMM_ADDTS_STATUS_REFUSED; 278 } 279 280 /* Convert to 32 microseconds per second unit */ 281 tspec->medium_time = host_to_le16(medium_time / 32); 282 283 return WMM_ADDTS_STATUS_ADMISSION_ACCEPTED; 284 } 285 286 287 static void wmm_addts_req(struct hostapd_data *hapd, 288 const struct ieee80211_mgmt *mgmt, 289 const struct wmm_tspec_element *tspec, size_t len) 290 { 291 const u8 *end = ((const u8 *) mgmt) + len; 292 int res; 293 struct wmm_tspec_element tspec_resp; 294 295 if ((const u8 *) (tspec + 1) > end) { 296 wpa_printf(MSG_DEBUG, "WMM: TSPEC overflow in ADDTS Request"); 297 return; 298 } 299 300 wpa_printf(MSG_DEBUG, "WMM: ADDTS Request (Dialog Token %d) for TSPEC " 301 "from " MACSTR, 302 mgmt->u.action.u.wmm_action.dialog_token, 303 MAC2STR(mgmt->sa)); 304 305 os_memcpy(&tspec_resp, tspec, sizeof(struct wmm_tspec_element)); 306 res = wmm_process_tspec(&tspec_resp); 307 wpa_printf(MSG_DEBUG, "WMM: ADDTS processing result: %d", res); 308 309 wmm_send_action(hapd, mgmt->sa, &tspec_resp, WMM_ACTION_CODE_ADDTS_RESP, 310 mgmt->u.action.u.wmm_action.dialog_token, res); 311 } 312 313 314 void hostapd_wmm_action(struct hostapd_data *hapd, 315 const struct ieee80211_mgmt *mgmt, size_t len) 316 { 317 int action_code; 318 int left = len - IEEE80211_HDRLEN - 4; 319 const u8 *pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 4; 320 struct ieee802_11_elems elems; 321 struct sta_info *sta = ap_get_sta(hapd, mgmt->sa); 322 323 /* check that the request comes from a valid station */ 324 if (!sta || 325 (sta->flags & (WLAN_STA_ASSOC | WLAN_STA_WMM)) != 326 (WLAN_STA_ASSOC | WLAN_STA_WMM)) { 327 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211, 328 HOSTAPD_LEVEL_DEBUG, 329 "wmm action received is not from associated wmm" 330 " station"); 331 /* TODO: respond with action frame refused status code */ 332 return; 333 } 334 335 if (left < 0) 336 return; /* not a valid WMM Action frame */ 337 338 /* extract the tspec info element */ 339 if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) { 340 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211, 341 HOSTAPD_LEVEL_DEBUG, 342 "hostapd_wmm_action - could not parse wmm " 343 "action"); 344 /* TODO: respond with action frame invalid parameters status 345 * code */ 346 return; 347 } 348 349 if (!elems.wmm_tspec || 350 elems.wmm_tspec_len != (sizeof(struct wmm_tspec_element) - 2)) { 351 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211, 352 HOSTAPD_LEVEL_DEBUG, 353 "hostapd_wmm_action - missing or wrong length " 354 "tspec"); 355 /* TODO: respond with action frame invalid parameters status 356 * code */ 357 return; 358 } 359 360 /* TODO: check the request is for an AC with ACM set, if not, refuse 361 * request */ 362 363 action_code = mgmt->u.action.u.wmm_action.action_code; 364 switch (action_code) { 365 case WMM_ACTION_CODE_ADDTS_REQ: 366 wmm_addts_req(hapd, mgmt, (struct wmm_tspec_element *) 367 (elems.wmm_tspec - 2), len); 368 return; 369 #if 0 370 /* TODO: needed for client implementation */ 371 case WMM_ACTION_CODE_ADDTS_RESP: 372 wmm_setup_request(hapd, mgmt, len); 373 return; 374 /* TODO: handle station teardown requests */ 375 case WMM_ACTION_CODE_DELTS: 376 wmm_teardown(hapd, mgmt, len); 377 return; 378 #endif 379 } 380 381 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211, 382 HOSTAPD_LEVEL_DEBUG, 383 "hostapd_wmm_action - unknown action code %d", 384 action_code); 385 } 386
Indexes created Wed Jun 24 00:24:50 UTC 2026