--- /dev/null
+/*
+ * hostapd / WMM (Wi-Fi Multimedia)
+ * Copyright 2002-2003, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "common/ieee802_11_defs.h"
+#include "common/ieee802_11_common.h"
+#include "hostapd.h"
+#include "ieee802_11.h"
+#include "sta_info.h"
+#include "ap_config.h"
+#include "wmm.h"
+
+
+/* TODO: maintain separate sequence and fragment numbers for each AC
+ * TODO: IGMP snooping to track which multicasts to forward - and use QOS-DATA
+ * if only WMM stations are receiving a certain group */
+
+
+static inline u8 wmm_aci_aifsn(int aifsn, int acm, int aci)
+{
+ u8 ret;
+ ret = (aifsn << WMM_AC_AIFNS_SHIFT) & WMM_AC_AIFSN_MASK;
+ if (acm)
+ ret |= WMM_AC_ACM;
+ ret |= (aci << WMM_AC_ACI_SHIFT) & WMM_AC_ACI_MASK;
+ return ret;
+}
+
+
+static inline u8 wmm_ecw(int ecwmin, int ecwmax)
+{
+ return ((ecwmin << WMM_AC_ECWMIN_SHIFT) & WMM_AC_ECWMIN_MASK) |
+ ((ecwmax << WMM_AC_ECWMAX_SHIFT) & WMM_AC_ECWMAX_MASK);
+}
+
+
+/*
+ * Add WMM Parameter Element to Beacon, Probe Response, and (Re)Association
+ * Response frames.
+ */
+u8 * hostapd_eid_wmm(struct hostapd_data *hapd, u8 *eid)
+{
+ u8 *pos = eid;
+ struct wmm_parameter_element *wmm =
+ (struct wmm_parameter_element *) (pos + 2);
+ int e;
+
+ if (!hapd->conf->wmm_enabled)
+ return eid;
+ eid[0] = WLAN_EID_VENDOR_SPECIFIC;
+ wmm->oui[0] = 0x00;
+ wmm->oui[1] = 0x50;
+ wmm->oui[2] = 0xf2;
+ wmm->oui_type = WMM_OUI_TYPE;
+ wmm->oui_subtype = WMM_OUI_SUBTYPE_PARAMETER_ELEMENT;
+ wmm->version = WMM_VERSION;
+ wmm->qos_info = hapd->parameter_set_count & 0xf;
+
+ if (hapd->conf->wmm_uapsd)
+ wmm->qos_info |= 0x80;
+
+ /* fill in a parameter set record for each AC */
+ for (e = 0; e < 4; e++) {
+ struct wmm_ac_parameter *ac = &wmm->ac[e];
+ struct hostapd_wmm_ac_params *acp =
+ &hapd->iconf->wmm_ac_params[e];
+
+ ac->aci_aifsn = wmm_aci_aifsn(acp->aifs,
+ acp->admission_control_mandatory,
+ e);
+ ac->cw = wmm_ecw(acp->cwmin, acp->cwmax);
+ ac->txop_limit = host_to_le16(acp->txop_limit);
+ }
+
+ pos = (u8 *) (wmm + 1);
+ eid[1] = pos - eid - 2; /* element length */
+
+ return pos;
+}
+
+
+/* This function is called when a station sends an association request with
+ * WMM info element. The function returns zero on success or non-zero on any
+ * error in WMM element. eid does not include Element ID and Length octets. */
+int hostapd_eid_wmm_valid(struct hostapd_data *hapd, const u8 *eid, size_t len)
+{
+ struct wmm_information_element *wmm;
+
+ wpa_hexdump(MSG_MSGDUMP, "WMM IE", eid, len);
+
+ if (len < sizeof(struct wmm_information_element)) {
+ wpa_printf(MSG_DEBUG, "Too short WMM IE (len=%lu)",
+ (unsigned long) len);
+ return -1;
+ }
+
+ wmm = (struct wmm_information_element *) eid;
+ wpa_printf(MSG_DEBUG, "Validating WMM IE: OUI %02x:%02x:%02x "
+ "OUI type %d OUI sub-type %d version %d QoS info 0x%x",
+ wmm->oui[0], wmm->oui[1], wmm->oui[2], wmm->oui_type,
+ wmm->oui_subtype, wmm->version, wmm->qos_info);
+ if (wmm->oui_subtype != WMM_OUI_SUBTYPE_INFORMATION_ELEMENT ||
+ wmm->version != WMM_VERSION) {
+ wpa_printf(MSG_DEBUG, "Unsupported WMM IE Subtype/Version");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static void wmm_send_action(struct hostapd_data *hapd, const u8 *addr,
+ const struct wmm_tspec_element *tspec,
+ u8 action_code, u8 dialogue_token, u8 status_code)
+{
+ u8 buf[256];
+ struct ieee80211_mgmt *m = (struct ieee80211_mgmt *) buf;
+ struct wmm_tspec_element *t = (struct wmm_tspec_element *)
+ m->u.action.u.wmm_action.variable;
+ int len;
+
+ hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "action response - reason %d", status_code);
+ os_memset(buf, 0, sizeof(buf));
+ m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
+ WLAN_FC_STYPE_ACTION);
+ os_memcpy(m->da, addr, ETH_ALEN);
+ os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
+ os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
+ m->u.action.category = WLAN_ACTION_WMM;
+ m->u.action.u.wmm_action.action_code = action_code;
+ m->u.action.u.wmm_action.dialog_token = dialogue_token;
+ m->u.action.u.wmm_action.status_code = status_code;
+ os_memcpy(t, tspec, sizeof(struct wmm_tspec_element));
+ len = ((u8 *) (t + 1)) - buf;
+
+ if (hapd->drv.send_mgmt_frame(hapd, m, len) < 0)
+ perror("wmm_send_action: send");
+}
+
+
+int wmm_process_tspec(struct wmm_tspec_element *tspec)
+{
+ int medium_time, pps, duration;
+ int up, psb, dir, tid;
+ u16 val, surplus;
+
+ up = (tspec->ts_info[1] >> 3) & 0x07;
+ psb = (tspec->ts_info[1] >> 2) & 0x01;
+ dir = (tspec->ts_info[0] >> 5) & 0x03;
+ tid = (tspec->ts_info[0] >> 1) & 0x0f;
+ wpa_printf(MSG_DEBUG, "WMM: TS Info: UP=%d PSB=%d Direction=%d TID=%d",
+ up, psb, dir, tid);
+ val = le_to_host16(tspec->nominal_msdu_size);
+ wpa_printf(MSG_DEBUG, "WMM: Nominal MSDU Size: %d%s",
+ val & 0x7fff, val & 0x8000 ? " (fixed)" : "");
+ wpa_printf(MSG_DEBUG, "WMM: Mean Data Rate: %u bps",
+ le_to_host32(tspec->mean_data_rate));
+ wpa_printf(MSG_DEBUG, "WMM: Minimum PHY Rate: %u bps",
+ le_to_host32(tspec->minimum_phy_rate));
+ val = le_to_host16(tspec->surplus_bandwidth_allowance);
+ wpa_printf(MSG_DEBUG, "WMM: Surplus Bandwidth Allowance: %u.%04u",
+ val >> 13, 10000 * (val & 0x1fff) / 0x2000);
+
+ val = le_to_host16(tspec->nominal_msdu_size);
+ if (val == 0) {
+ wpa_printf(MSG_DEBUG, "WMM: Invalid Nominal MSDU Size (0)");
+ return WMM_ADDTS_STATUS_INVALID_PARAMETERS;
+ }
+ /* pps = Ceiling((Mean Data Rate / 8) / Nominal MSDU Size) */
+ pps = ((le_to_host32(tspec->mean_data_rate) / 8) + val - 1) / val;
+ wpa_printf(MSG_DEBUG, "WMM: Packets-per-second estimate for TSPEC: %d",
+ pps);
+
+ if (le_to_host32(tspec->minimum_phy_rate) < 1000000) {
+ wpa_printf(MSG_DEBUG, "WMM: Too small Minimum PHY Rate");
+ return WMM_ADDTS_STATUS_INVALID_PARAMETERS;
+ }
+
+ duration = (le_to_host16(tspec->nominal_msdu_size) & 0x7fff) * 8 /
+ (le_to_host32(tspec->minimum_phy_rate) / 1000000) +
+ 50 /* FIX: proper SIFS + ACK duration */;
+
+ /* unsigned binary number with an implicit binary point after the
+ * leftmost 3 bits, i.e., 0x2000 = 1.0 */
+ surplus = le_to_host16(tspec->surplus_bandwidth_allowance);
+ if (surplus <= 0x2000) {
+ wpa_printf(MSG_DEBUG, "WMM: Surplus Bandwidth Allowance not "
+ "greater than unity");
+ return WMM_ADDTS_STATUS_INVALID_PARAMETERS;
+ }
+
+ medium_time = surplus * pps * duration / 0x2000;
+ wpa_printf(MSG_DEBUG, "WMM: Estimated medium time: %u", medium_time);
+
+ /*
+ * TODO: store list of granted (and still active) TSPECs and check
+ * whether there is available medium time for this request. For now,
+ * just refuse requests that would by themselves take very large
+ * portion of the available bandwidth.
+ */
+ if (medium_time > 750000) {
+ wpa_printf(MSG_DEBUG, "WMM: Refuse TSPEC request for over "
+ "75%% of available bandwidth");
+ return WMM_ADDTS_STATUS_REFUSED;
+ }
+
+ /* Convert to 32 microseconds per second unit */
+ tspec->medium_time = host_to_le16(medium_time / 32);
+
+ return WMM_ADDTS_STATUS_ADMISSION_ACCEPTED;
+}
+
+
+static void wmm_addts_req(struct hostapd_data *hapd,
+ const struct ieee80211_mgmt *mgmt,
+ struct wmm_tspec_element *tspec, size_t len)
+{
+ const u8 *end = ((const u8 *) mgmt) + len;
+ int res;
+
+ if ((const u8 *) (tspec + 1) > end) {
+ wpa_printf(MSG_DEBUG, "WMM: TSPEC overflow in ADDTS Request");
+ return;
+ }
+
+ wpa_printf(MSG_DEBUG, "WMM: ADDTS Request (Dialog Token %d) for TSPEC "
+ "from " MACSTR,
+ mgmt->u.action.u.wmm_action.dialog_token,
+ MAC2STR(mgmt->sa));
+
+ res = wmm_process_tspec(tspec);
+ wpa_printf(MSG_DEBUG, "WMM: ADDTS processing result: %d", res);
+
+ wmm_send_action(hapd, mgmt->sa, tspec, WMM_ACTION_CODE_ADDTS_RESP,
+ mgmt->u.action.u.wmm_action.dialog_token, res);
+}
+
+
+void hostapd_wmm_action(struct hostapd_data *hapd,
+ const struct ieee80211_mgmt *mgmt, size_t len)
+{
+ int action_code;
+ int left = len - IEEE80211_HDRLEN - 4;
+ const u8 *pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 4;
+ struct ieee802_11_elems elems;
+ struct sta_info *sta = ap_get_sta(hapd, mgmt->sa);
+
+ /* check that the request comes from a valid station */
+ if (!sta ||
+ (sta->flags & (WLAN_STA_ASSOC | WLAN_STA_WMM)) !=
+ (WLAN_STA_ASSOC | WLAN_STA_WMM)) {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "wmm action received is not from associated wmm"
+ " station");
+ /* TODO: respond with action frame refused status code */
+ return;
+ }
+
+ /* extract the tspec info element */
+ if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "hostapd_wmm_action - could not parse wmm "
+ "action");
+ /* TODO: respond with action frame invalid parameters status
+ * code */
+ return;
+ }
+
+ if (!elems.wmm_tspec ||
+ elems.wmm_tspec_len != (sizeof(struct wmm_tspec_element) - 2)) {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "hostapd_wmm_action - missing or wrong length "
+ "tspec");
+ /* TODO: respond with action frame invalid parameters status
+ * code */
+ return;
+ }
+
+ /* TODO: check the request is for an AC with ACM set, if not, refuse
+ * request */
+
+ action_code = mgmt->u.action.u.wmm_action.action_code;
+ switch (action_code) {
+ case WMM_ACTION_CODE_ADDTS_REQ:
+ wmm_addts_req(hapd, mgmt, (struct wmm_tspec_element *)
+ (elems.wmm_tspec - 2), len);
+ return;
+#if 0
+ /* TODO: needed for client implementation */
+ case WMM_ACTION_CODE_ADDTS_RESP:
+ wmm_setup_request(hapd, mgmt, len);
+ return;
+ /* TODO: handle station teardown requests */
+ case WMM_ACTION_CODE_DELTS:
+ wmm_teardown(hapd, mgmt, len);
+ return;
+#endif
+ }
+
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "hostapd_wmm_action - unknown action code %d",
+ action_code);
+}
projects / mech_eap.git / blobdiff