DGNum/hostapd
6
0
Fork 0
Code Issues Pull requests 1 Projects Releases Packages Wiki Activity Actions
hostapd/src/ap/wmm.c
Haim Dreyfuss de6aafaa63 AP: Consider regulatory limitation when filling WMM element 
In case the current channel has regulatory WMM limitations, take them
into account when filling the WMM element. Also check if the new WMM
element is different from the previous one and if so change the
parameter_set_count to imply stations to look into it.

Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
2019-05-28 23:37:25 +03:00

388 lines
12 KiB
C
Raw Blame History

/*
* 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 software may be distributed under the terms of the BSD license.
* See README 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 "ap_drv_ops.h"
#include "wmm.h"
#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif
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);
}
static void
wmm_set_regulatory_limit(const struct hostapd_wmm_ac_params *wmm_conf,
struct hostapd_wmm_ac_params *wmm,
const struct hostapd_wmm_rule *wmm_reg)
{
int ac;
for (ac = 0; ac < WMM_AC_NUM; ac++) {
wmm[ac].cwmin = MAX(wmm_conf[ac].cwmin, wmm_reg[ac].min_cwmin);
wmm[ac].cwmax = MAX(wmm_conf[ac].cwmax, wmm_reg[ac].min_cwmax);
wmm[ac].aifs = MAX(wmm_conf[ac].aifs, wmm_reg[ac].min_aifs);
wmm[ac].txop_limit =
MIN(wmm_conf[ac].txop_limit, wmm_reg[ac].max_txop);
wmm[ac].admission_control_mandatory =
wmm_conf[ac].admission_control_mandatory;
}
}
/*
* Calculate WMM regulatory limit if any.
*/
static void wmm_calc_regulatory_limit(struct hostapd_data *hapd,
struct hostapd_wmm_ac_params *acp)
{
struct hostapd_hw_modes *mode = hapd->iface->current_mode;
int c;
os_memcpy(acp, hapd->iconf->wmm_ac_params,
sizeof(hapd->iconf->wmm_ac_params));
for (c = 0; mode && c < mode->num_channels; c++) {
struct hostapd_channel_data *chan = &mode->channels[c];
if (chan->freq != hapd->iface->freq)
continue;
if (chan->wmm_rules_valid)
wmm_set_regulatory_limit(hapd->iconf->wmm_ac_params,
acp, chan->wmm_rules);
break;
}
/*
* Check if we need to update set count. Since both were initialized to
* zero we can compare the whole array in one shot.
*/
if (os_memcmp(acp, hapd->iface->prev_wmm,
sizeof(hapd->iconf->wmm_ac_params)) != 0) {
os_memcpy(hapd->iface->prev_wmm, acp,
sizeof(hapd->iconf->wmm_ac_params));
hapd->parameter_set_count++;
}
}
/*
* 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);
struct hostapd_wmm_ac_params wmmp[WMM_AC_NUM] = { 0 };
int e;
if (!hapd->conf->wmm_enabled)
return eid;
wmm_calc_regulatory_limit(hapd, wmmp);
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 &&
(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_UAPSD))
wmm->qos_info |= 0x80;
wmm->reserved = 0;
/* 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 = &wmmp[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 1 on success or 0 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 0;
}
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 0;
}
return 1;
}
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 (hostapd_drv_send_mlme(hapd, m, len, 0) < 0)
wpa_printf(MSG_INFO, "wmm_send_action: send failed");
}
int wmm_process_tspec(struct wmm_tspec_element *tspec)
{
u64 medium_time;
unsigned int pps, duration;
unsigned 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 = (u64) surplus * pps * duration / 0x2000;
wpa_printf(MSG_DEBUG, "WMM: Estimated medium time: %lu",
(unsigned long) 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;
}
if (left < 0)
return; /* not a valid WMM Action frame */
/* 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);
}
Reference in a new issue View git blame Copy permalink