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hostap/hostapd/wme.c

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/*
* 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 = WLAN_ACTION_WMM;
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(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);
}
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