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 inline u8 wmm_aci_aifsn(int aifsn, int acm, int aci)
33 ret = (aifsn << WMM_AC_AIFNS_SHIFT) & WMM_AC_AIFSN_MASK;
36 ret |= (aci << WMM_AC_ACI_SHIFT) & WMM_AC_ACI_MASK;
41 static inline u8 wmm_ecw(int ecwmin, int ecwmax)
43 return ((ecwmin << WMM_AC_ECWMIN_SHIFT) & WMM_AC_ECWMIN_MASK) |
44 ((ecwmax << WMM_AC_ECWMAX_SHIFT) & WMM_AC_ECWMAX_MASK);
49 * Add WMM Parameter Element to Beacon, Probe Response, and (Re)Association
52 u8 * hostapd_eid_wmm(struct hostapd_data *hapd, u8 *eid)
55 struct wmm_parameter_element *wmm =
56 (struct wmm_parameter_element *) (pos + 2);
59 if (!hapd->conf->wmm_enabled)
61 eid[0] = WLAN_EID_VENDOR_SPECIFIC;
65 wmm->oui_type = WMM_OUI_TYPE;
66 wmm->oui_subtype = WMM_OUI_SUBTYPE_PARAMETER_ELEMENT;
67 wmm->version = WMM_VERSION;
68 wmm->qos_info = hapd->parameter_set_count & 0xf;
70 /* fill in a parameter set record for each AC */
71 for (e = 0; e < 4; e++) {
72 struct wmm_ac_parameter *ac = &wmm->ac[e];
73 struct hostapd_wmm_ac_params *acp =
74 &hapd->iconf->wmm_ac_params[e];
76 ac->aci_aifsn = wmm_aci_aifsn(acp->aifs,
77 acp->admission_control_mandatory,
79 ac->cw = wmm_ecw(acp->cwmin, acp->cwmax);
80 ac->txop_limit = host_to_le16(acp->txop_limit);
83 pos = (u8 *) (wmm + 1);
84 eid[1] = pos - eid - 2; /* element length */
90 /* This function is called when a station sends an association request with
91 * WMM info element. The function returns zero on success or non-zero on any
92 * error in WMM element. eid does not include Element ID and Length octets. */
93 int hostapd_eid_wmm_valid(struct hostapd_data *hapd, u8 *eid, size_t len)
95 struct wmm_information_element *wmm;
97 wpa_hexdump(MSG_MSGDUMP, "WMM IE", eid, len);
99 if (len < sizeof(struct wmm_information_element)) {
100 wpa_printf(MSG_DEBUG, "Too short WMM IE (len=%lu)",
101 (unsigned long) len);
105 wmm = (struct wmm_information_element *) eid;
106 wpa_printf(MSG_DEBUG, "Validating WMM IE: OUI %02x:%02x:%02x "
107 "OUI type %d OUI sub-type %d version %d QoS info 0x%x",
108 wmm->oui[0], wmm->oui[1], wmm->oui[2], wmm->oui_type,
109 wmm->oui_subtype, wmm->version, wmm->qos_info);
110 if (wmm->oui_subtype != WMM_OUI_SUBTYPE_INFORMATION_ELEMENT ||
111 wmm->version != WMM_VERSION) {
112 wpa_printf(MSG_DEBUG, "Unsupported WMM IE Subtype/Version");
120 /* This function is called when a station sends an ACK frame for an AssocResp
121 * frame (status=success) and the matching AssocReq contained a WMM element.
123 int hostapd_wmm_sta_config(struct hostapd_data *hapd, struct sta_info *sta)
125 /* update kernel STA data for WMM related items (WLAN_STA_WPA flag) */
126 if (sta->flags & WLAN_STA_WMM)
127 hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
130 hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
137 static void wmm_send_action(struct hostapd_data *hapd, const u8 *addr,
138 const struct wmm_tspec_element *tspec,
139 u8 action_code, u8 dialogue_token, u8 status_code)
142 struct ieee80211_mgmt *m = (struct ieee80211_mgmt *) buf;
143 struct wmm_tspec_element *t = (struct wmm_tspec_element *)
144 m->u.action.u.wmm_action.variable;
147 hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
149 "action response - reason %d", status_code);
150 os_memset(buf, 0, sizeof(buf));
151 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
152 WLAN_FC_STYPE_ACTION);
153 os_memcpy(m->da, addr, ETH_ALEN);
154 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
155 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
156 m->u.action.category = WLAN_ACTION_WMM;
157 m->u.action.u.wmm_action.action_code = action_code;
158 m->u.action.u.wmm_action.dialog_token = dialogue_token;
159 m->u.action.u.wmm_action.status_code = status_code;
160 os_memcpy(t, tspec, sizeof(struct wmm_tspec_element));
161 len = ((u8 *) (t + 1)) - buf;
163 if (hostapd_send_mgmt_frame(hapd, m, len, 0) < 0)
164 perror("wmm_send_action: send");
168 /* given frame data payload size in bytes, and data_rate in bits per second
169 * returns time to complete frame exchange */
170 /* FIX: should not use floating point types */
171 static double wmm_frame_exchange_time(int bytes, int data_rate, int encryption,
174 /* TODO: account for MAC/PHY headers correctly */
175 /* TODO: account for encryption headers */
176 /* TODO: account for WDS headers */
177 /* TODO: account for CTS protection */
178 /* TODO: account for SIFS + ACK at minimum PHY rate */
179 return (bytes + 400) * 8.0 / data_rate;
183 static void wmm_addts_req(struct hostapd_data *hapd,
184 struct ieee80211_mgmt *mgmt,
185 struct wmm_tspec_element *tspec, size_t len)
187 /* FIX: should not use floating point types */
188 double medium_time, pps;
190 /* TODO: account for airtime and answer no to tspec setup requests
191 * when none left!! */
193 pps = (le_to_host32(tspec->mean_data_rate) / 8.0) /
194 le_to_host16(tspec->nominal_msdu_size);
195 medium_time = (le_to_host16(tspec->surplus_bandwidth_allowance) / 8) *
197 wmm_frame_exchange_time(le_to_host16(tspec->nominal_msdu_size),
198 le_to_host32(tspec->minimum_phy_rate),
200 tspec->medium_time = host_to_le16(medium_time * 1000000.0 / 32.0);
202 wmm_send_action(hapd, mgmt->sa, tspec, WMM_ACTION_CODE_ADDTS_RESP,
203 mgmt->u.action.u.wmm_action.dialog_token,
204 WMM_ADDTS_STATUS_ADMISSION_ACCEPTED);
208 void hostapd_wmm_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
212 int left = len - IEEE80211_HDRLEN - 4;
213 u8 *pos = ((u8 *) mgmt) + IEEE80211_HDRLEN + 4;
214 struct ieee802_11_elems elems;
215 struct sta_info *sta = ap_get_sta(hapd, mgmt->sa);
217 /* check that the request comes from a valid station */
219 (sta->flags & (WLAN_STA_ASSOC | WLAN_STA_WMM)) !=
220 (WLAN_STA_ASSOC | WLAN_STA_WMM)) {
221 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
223 "wmm action received is not from associated wmm"
225 /* TODO: respond with action frame refused status code */
229 /* extract the tspec info element */
230 if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) {
231 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
233 "hostapd_wmm_action - could not parse wmm "
235 /* TODO: respond with action frame invalid parameters status
240 if (!elems.wmm_tspec ||
241 elems.wmm_tspec_len != (sizeof(struct wmm_tspec_element) - 2)) {
242 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
244 "hostapd_wmm_action - missing or wrong length "
246 /* TODO: respond with action frame invalid parameters status
251 /* TODO: check the request is for an AC with ACM set, if not, refuse
254 action_code = mgmt->u.action.u.wmm_action.action_code;
255 switch (action_code) {
256 case WMM_ACTION_CODE_ADDTS_REQ:
257 wmm_addts_req(hapd, mgmt, (struct wmm_tspec_element *)
258 (elems.wmm_tspec - 2), len);
261 /* TODO: needed for client implementation */
262 case WMM_ACTION_CODE_ADDTS_RESP:
263 wmm_setup_request(hapd, mgmt, len);
265 /* TODO: handle station teardown requests */
266 case WMM_ACTION_CODE_DELTS:
267 wmm_teardown(hapd, mgmt, len);
272 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
274 "hostapd_wmm_action - unknown action code %d",