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authorJouni Malinen <j@w1.fi>2008-02-28 01:34:43 (GMT)
committerJouni Malinen <jm@jm.kir.nu>2008-02-28 01:34:43 (GMT)
commit6fc6879bd55a394f807cbbe927df736c190cb8ab (patch)
treecdf50da0c58f21510a808d53502a060d911ff243 /hostapd/wme.c
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Re-initialize hostapd/wpa_supplicant git repository based on 0.6.3 release
Diffstat (limited to 'hostapd/wme.c')
-rw-r--r--hostapd/wme.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/hostapd/wme.c b/hostapd/wme.c
new file mode 100644
index 0000000..ae2357e
--- /dev/null
+++ b/hostapd/wme.c
@@ -0,0 +1,263 @@
+/*
+ * hostapd / WMM (Wi-Fi Multimedia)
+ * Copyright 2002-2003, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ *
+ * 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 "includes.h"
+
+#include "hostapd.h"
+#include "ieee802_11.h"
+#include "wme.h"
+#include "sta_info.h"
+#include "driver.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 WME stations are receiving a certain group */
+
+
+static u8 wme_oui[3] = { 0x00, 0x50, 0xf2 };
+
+
+/* Add WME Parameter Element to Beacon and Probe Response frames. */
+u8 * hostapd_eid_wme(struct hostapd_data *hapd, u8 *eid)
+{
+ u8 *pos = eid;
+ struct wme_parameter_element *wme =
+ (struct wme_parameter_element *) (pos + 2);
+ int e;
+
+ if (!hapd->conf->wme_enabled)
+ return eid;
+ eid[0] = WLAN_EID_VENDOR_SPECIFIC;
+ wme->oui[0] = 0x00;
+ wme->oui[1] = 0x50;
+ wme->oui[2] = 0xf2;
+ wme->oui_type = WME_OUI_TYPE;
+ wme->oui_subtype = WME_OUI_SUBTYPE_PARAMETER_ELEMENT;
+ wme->version = WME_VERSION;
+ wme->acInfo = hapd->parameter_set_count & 0xf;
+
+ /* fill in a parameter set record for each AC */
+ for (e = 0; e < 4; e++) {
+ struct wme_ac_parameter *ac = &wme->ac[e];
+ struct hostapd_wme_ac_params *acp =
+ &hapd->iconf->wme_ac_params[e];
+
+ ac->aifsn = acp->aifs;
+ ac->acm = acp->admission_control_mandatory;
+ ac->aci = e;
+ ac->reserved = 0;
+ ac->eCWmin = acp->cwmin;
+ ac->eCWmax = acp->cwmax;
+ ac->txopLimit = host_to_le16(acp->txopLimit);
+ }
+
+ pos = (u8 *) (wme + 1);
+ eid[1] = pos - eid - 2; /* element length */
+
+ return pos;
+}
+
+
+/* This function is called when a station sends an association request with
+ * WME info element. The function returns zero on success or non-zero on any
+ * error in WME element. eid does not include Element ID and Length octets. */
+int hostapd_eid_wme_valid(struct hostapd_data *hapd, u8 *eid, size_t len)
+{
+ struct wme_information_element *wme;
+
+ wpa_hexdump(MSG_MSGDUMP, "WME IE", eid, len);
+
+ if (len < sizeof(struct wme_information_element)) {
+ wpa_printf(MSG_DEBUG, "Too short WME IE (len=%lu)",
+ (unsigned long) len);
+ return -1;
+ }
+
+ wme = (struct wme_information_element *) eid;
+ wpa_printf(MSG_DEBUG, "Validating WME IE: OUI %02x:%02x:%02x "
+ "OUI type %d OUI sub-type %d version %d",
+ wme->oui[0], wme->oui[1], wme->oui[2], wme->oui_type,
+ wme->oui_subtype, wme->version);
+ if (os_memcmp(wme->oui, wme_oui, sizeof(wme_oui)) != 0 ||
+ wme->oui_type != WME_OUI_TYPE ||
+ wme->oui_subtype != WME_OUI_SUBTYPE_INFORMATION_ELEMENT ||
+ wme->version != WME_VERSION) {
+ wpa_printf(MSG_DEBUG, "Unsupported WME IE OUI/Type/Subtype/"
+ "Version");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/* This function is called when a station sends an ACK frame for an AssocResp
+ * frame (status=success) and the matching AssocReq contained a WME element.
+ */
+int hostapd_wme_sta_config(struct hostapd_data *hapd, struct sta_info *sta)
+{
+ /* update kernel STA data for WME related items (WLAN_STA_WPA flag) */
+ if (sta->flags & WLAN_STA_WME)
+ hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
+ WLAN_STA_WME, ~0);
+ else
+ hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
+ 0, ~WLAN_STA_WME);
+
+ return 0;
+}
+
+
+static void wme_send_action(struct hostapd_data *hapd, const u8 *addr,
+ const struct wme_tspec_info_element *tspec,
+ u8 action_code, u8 dialogue_token, u8 status_code)
+{
+ u8 buf[256];
+ struct ieee80211_mgmt *m = (struct ieee80211_mgmt *) buf;
+ struct wme_tspec_info_element *t =
+ (struct wme_tspec_info_element *)
+ m->u.action.u.wme_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 = WME_ACTION_CATEGORY;
+ m->u.action.u.wme_action.action_code = action_code;
+ m->u.action.u.wme_action.dialog_token = dialogue_token;
+ m->u.action.u.wme_action.status_code = status_code;
+ os_memcpy(t, tspec, sizeof(struct wme_tspec_info_element));
+ len = ((u8 *) (t + 1)) - buf;
+
+ if (hostapd_send_mgmt_frame(hapd, m, len, 0) < 0)
+ perror("wme_send_action: send");
+}
+
+
+/* given frame data payload size in bytes, and data_rate in bits per second
+ * returns time to complete frame exchange */
+/* FIX: should not use floating point types */
+static double wme_frame_exchange_time(int bytes, int data_rate, int encryption,
+ int cts_protection)
+{
+ /* TODO: account for MAC/PHY headers correctly */
+ /* TODO: account for encryption headers */
+ /* TODO: account for WDS headers */
+ /* TODO: account for CTS protection */
+ /* TODO: account for SIFS + ACK at minimum PHY rate */
+ return (bytes + 400) * 8.0 / data_rate;
+}
+
+
+static void wme_setup_request(struct hostapd_data *hapd,
+ struct ieee80211_mgmt *mgmt,
+ struct wme_tspec_info_element *tspec, size_t len)
+{
+ /* FIX: should not use floating point types */
+ double medium_time, pps;
+
+ /* TODO: account for airtime and answer no to tspec setup requests
+ * when none left!! */
+
+ pps = (tspec->mean_data_rate / 8.0) / tspec->nominal_msdu_size;
+ medium_time = (tspec->surplus_bandwidth_allowance / 8) * pps *
+ wme_frame_exchange_time(tspec->nominal_msdu_size,
+ tspec->minimum_phy_rate, 0, 0);
+ tspec->medium_time = medium_time * 1000000.0 / 32.0;
+
+ wme_send_action(hapd, mgmt->sa, tspec, WME_ACTION_CODE_SETUP_RESPONSE,
+ mgmt->u.action.u.wme_action.dialog_token,
+ WME_SETUP_RESPONSE_STATUS_ADMISSION_ACCEPTED);
+}
+
+
+void hostapd_wme_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ int action_code;
+ int left = len - IEEE80211_HDRLEN - 4;
+ u8 *pos = ((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_WME)) !=
+ (WLAN_STA_ASSOC | WLAN_STA_WME)) {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "wme action received is not from associated wme"
+ " station");
+ /* TODO: respond with action frame refused status code */
+ return;
+ }
+
+ /* extract the tspec info element */
+ if (ieee802_11_parse_elems(hapd, pos, left, &elems, 1) == ParseFailed)
+ {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "hostapd_wme_action - could not parse wme "
+ "action");
+ /* TODO: respond with action frame invalid parameters status
+ * code */
+ return;
+ }
+
+ if (!elems.wme_tspec ||
+ elems.wme_tspec_len != (sizeof(struct wme_tspec_info_element) - 2))
+ {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "hostapd_wme_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.wme_action.action_code;
+ switch (action_code) {
+ case WME_ACTION_CODE_SETUP_REQUEST:
+ wme_setup_request(hapd, mgmt, (struct wme_tspec_info_element *)
+ elems.wme_tspec, len);
+ return;
+#if 0
+ /* TODO: needed for client implementation */
+ case WME_ACTION_CODE_SETUP_RESPONSE:
+ wme_setup_request(hapd, mgmt, len);
+ return;
+ /* TODO: handle station teardown requests */
+ case WME_ACTION_CODE_TEARDOWN:
+ wme_teardown(hapd, mgmt, len);
+ return;
+#endif
+ }
+
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+ HOSTAPD_LEVEL_DEBUG,
+ "hostapd_wme_action - unknown action code %d",
+ action_code);
+}