2 * hostapd / WMM (Wi-Fi Multimedia)
3 * Copyright 2002-2003, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
19 #include "ieee802_11.h"
25 /* TODO: maintain separate sequence and fragment numbers for each AC
26 * TODO: IGMP snooping to track which multicasts to forward - and use QOS-DATA
27 * if only WMM stations are receiving a certain group */
30 static u8 wmm_oui[3] = { 0x00, 0x50, 0xf2 };
34 * Add WMM Parameter Element to Beacon, Probe Response, and (Re)Association
37 u8 * hostapd_eid_wmm(struct hostapd_data *hapd, u8 *eid)
40 struct wmm_parameter_element *wmm =
41 (struct wmm_parameter_element *) (pos + 2);
44 if (!hapd->conf->wmm_enabled)
46 eid[0] = WLAN_EID_VENDOR_SPECIFIC;
50 wmm->oui_type = WMM_OUI_TYPE;
51 wmm->oui_subtype = WMM_OUI_SUBTYPE_PARAMETER_ELEMENT;
52 wmm->version = WMM_VERSION;
53 wmm->qos_info = hapd->parameter_set_count & 0xf;
55 /* fill in a parameter set record for each AC */
56 for (e = 0; e < 4; e++) {
57 struct wmm_ac_parameter *ac = &wmm->ac[e];
58 struct hostapd_wmm_ac_params *acp =
59 &hapd->iconf->wmm_ac_params[e];
61 ac->aifsn = acp->aifs;
62 ac->acm = acp->admission_control_mandatory;
65 ac->e_cw_min = acp->cwmin;
66 ac->e_cw_max = acp->cwmax;
67 ac->txop_limit = host_to_le16(acp->txop_limit);
70 pos = (u8 *) (wmm + 1);
71 eid[1] = pos - eid - 2; /* element length */
77 /* This function is called when a station sends an association request with
78 * WMM info element. The function returns zero on success or non-zero on any
79 * error in WMM element. eid does not include Element ID and Length octets. */
80 int hostapd_eid_wmm_valid(struct hostapd_data *hapd, u8 *eid, size_t len)
82 struct wmm_information_element *wmm;
84 wpa_hexdump(MSG_MSGDUMP, "WMM IE", eid, len);
86 if (len < sizeof(struct wmm_information_element)) {
87 wpa_printf(MSG_DEBUG, "Too short WMM IE (len=%lu)",
92 wmm = (struct wmm_information_element *) eid;
93 wpa_printf(MSG_DEBUG, "Validating WMM IE: OUI %02x:%02x:%02x "
94 "OUI type %d OUI sub-type %d version %d",
95 wmm->oui[0], wmm->oui[1], wmm->oui[2], wmm->oui_type,
96 wmm->oui_subtype, wmm->version);
97 if (os_memcmp(wmm->oui, wmm_oui, sizeof(wmm_oui)) != 0 ||
98 wmm->oui_type != WMM_OUI_TYPE ||
99 wmm->oui_subtype != WMM_OUI_SUBTYPE_INFORMATION_ELEMENT ||
100 wmm->version != WMM_VERSION) {
101 wpa_printf(MSG_DEBUG, "Unsupported WMM IE OUI/Type/Subtype/"
110 /* This function is called when a station sends an ACK frame for an AssocResp
111 * frame (status=success) and the matching AssocReq contained a WMM element.
113 int hostapd_wmm_sta_config(struct hostapd_data *hapd, struct sta_info *sta)
115 /* update kernel STA data for WMM related items (WLAN_STA_WPA flag) */
116 if (sta->flags & WLAN_STA_WMM)
117 hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
120 hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
127 static void wmm_send_action(struct hostapd_data *hapd, const u8 *addr,
128 const struct wmm_tspec_element *tspec,
129 u8 action_code, u8 dialogue_token, u8 status_code)
132 struct ieee80211_mgmt *m = (struct ieee80211_mgmt *) buf;
133 struct wmm_tspec_element *t = (struct wmm_tspec_element *)
134 m->u.action.u.wmm_action.variable;
137 hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
139 "action response - reason %d", status_code);
140 os_memset(buf, 0, sizeof(buf));
141 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
142 WLAN_FC_STYPE_ACTION);
143 os_memcpy(m->da, addr, ETH_ALEN);
144 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
145 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
146 m->u.action.category = WLAN_ACTION_WMM;
147 m->u.action.u.wmm_action.action_code = action_code;
148 m->u.action.u.wmm_action.dialog_token = dialogue_token;
149 m->u.action.u.wmm_action.status_code = status_code;
150 os_memcpy(t, tspec, sizeof(struct wmm_tspec_element));
151 len = ((u8 *) (t + 1)) - buf;
153 if (hostapd_send_mgmt_frame(hapd, m, len, 0) < 0)
154 perror("wmm_send_action: send");
158 /* given frame data payload size in bytes, and data_rate in bits per second
159 * returns time to complete frame exchange */
160 /* FIX: should not use floating point types */
161 static double wmm_frame_exchange_time(int bytes, int data_rate, int encryption,
164 /* TODO: account for MAC/PHY headers correctly */
165 /* TODO: account for encryption headers */
166 /* TODO: account for WDS headers */
167 /* TODO: account for CTS protection */
168 /* TODO: account for SIFS + ACK at minimum PHY rate */
169 return (bytes + 400) * 8.0 / data_rate;
173 static void wmm_addts_req(struct hostapd_data *hapd,
174 struct ieee80211_mgmt *mgmt,
175 struct wmm_tspec_element *tspec, size_t len)
177 /* FIX: should not use floating point types */
178 double medium_time, pps;
180 /* TODO: account for airtime and answer no to tspec setup requests
181 * when none left!! */
183 pps = (le_to_host32(tspec->mean_data_rate) / 8.0) /
184 le_to_host16(tspec->nominal_msdu_size);
185 medium_time = (le_to_host16(tspec->surplus_bandwidth_allowance) / 8) *
187 wmm_frame_exchange_time(le_to_host16(tspec->nominal_msdu_size),
188 le_to_host32(tspec->minimum_phy_rate),
190 tspec->medium_time = host_to_le16(medium_time * 1000000.0 / 32.0);
192 wmm_send_action(hapd, mgmt->sa, tspec, WMM_ACTION_CODE_ADDTS_RESP,
193 mgmt->u.action.u.wmm_action.dialog_token,
194 WMM_ADDTS_STATUS_ADMISSION_ACCEPTED);
198 void hostapd_wmm_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
202 int left = len - IEEE80211_HDRLEN - 4;
203 u8 *pos = ((u8 *) mgmt) + IEEE80211_HDRLEN + 4;
204 struct ieee802_11_elems elems;
205 struct sta_info *sta = ap_get_sta(hapd, mgmt->sa);
207 /* check that the request comes from a valid station */
209 (sta->flags & (WLAN_STA_ASSOC | WLAN_STA_WMM)) !=
210 (WLAN_STA_ASSOC | WLAN_STA_WMM)) {
211 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
213 "wmm action received is not from associated wmm"
215 /* TODO: respond with action frame refused status code */
219 /* extract the tspec info element */
220 if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) {
221 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
223 "hostapd_wmm_action - could not parse wmm "
225 /* TODO: respond with action frame invalid parameters status
230 if (!elems.wmm_tspec ||
231 elems.wmm_tspec_len != (sizeof(struct wmm_tspec_element) - 2)) {
232 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
234 "hostapd_wmm_action - missing or wrong length "
236 /* TODO: respond with action frame invalid parameters status
241 /* TODO: check the request is for an AC with ACM set, if not, refuse
244 action_code = mgmt->u.action.u.wmm_action.action_code;
245 switch (action_code) {
246 case WMM_ACTION_CODE_ADDTS_REQ:
247 wmm_addts_req(hapd, mgmt, (struct wmm_tspec_element *)
248 (elems.wmm_tspec - 2), len);
251 /* TODO: needed for client implementation */
252 case WMM_ACTION_CODE_ADDTS_RESP:
253 wmm_setup_request(hapd, mgmt, len);
255 /* TODO: handle station teardown requests */
256 case WMM_ACTION_CODE_DELTS:
257 wmm_teardown(hapd, mgmt, len);
262 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
264 "hostapd_wmm_action - unknown action code %d",