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hostap/src/ap/ieee802_11_shared.c
Helmut Schaa 8cfa3527e1 Allow MLME frames to be sent without expecting an ACK (no retries) 
In some situations it might be benefical to send a unicast frame without
the need for getting it ACKed (probe responses for example). In order to
achieve this add a new noack parameter to the drivers send_mlme callback
that can be used to advise the driver to not wait for an ACK for this
frame.

Signed-hostap: Helmut Schaa <helmut.schaa@googlemail.com>
2011-11-19 19:02:05 +02:00

405 lines
9.9 KiB
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/*
* hostapd / IEEE 802.11 Management
* Copyright (c) 2002-2010, 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 "hostapd.h"
#include "sta_info.h"
#include "ap_config.h"
#include "ap_drv_ops.h"
#include "ieee802_11.h"
#ifdef CONFIG_IEEE80211W
u8 * hostapd_eid_assoc_comeback_time(struct hostapd_data *hapd,
struct sta_info *sta, u8 *eid)
{
u8 *pos = eid;
u32 timeout, tu;
struct os_time now, passed;
*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
*pos++ = 5;
*pos++ = WLAN_TIMEOUT_ASSOC_COMEBACK;
os_get_time(&now);
os_time_sub(&now, &sta->sa_query_start, &passed);
tu = (passed.sec * 1000000 + passed.usec) / 1024;
if (hapd->conf->assoc_sa_query_max_timeout > tu)
timeout = hapd->conf->assoc_sa_query_max_timeout - tu;
else
timeout = 0;
if (timeout < hapd->conf->assoc_sa_query_max_timeout)
timeout++; /* add some extra time for local timers */
WPA_PUT_LE32(pos, timeout);
pos += 4;
return pos;
}
/* MLME-SAQuery.request */
void ieee802_11_send_sa_query_req(struct hostapd_data *hapd,
const u8 *addr, const u8 *trans_id)
{
struct ieee80211_mgmt mgmt;
u8 *end;
wpa_printf(MSG_DEBUG, "IEEE 802.11: Sending SA Query Request to "
MACSTR, MAC2STR(addr));
wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
trans_id, WLAN_SA_QUERY_TR_ID_LEN);
os_memset(&mgmt, 0, sizeof(mgmt));
mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_ACTION);
os_memcpy(mgmt.da, addr, ETH_ALEN);
os_memcpy(mgmt.sa, hapd->own_addr, ETH_ALEN);
os_memcpy(mgmt.bssid, hapd->own_addr, ETH_ALEN);
mgmt.u.action.category = WLAN_ACTION_SA_QUERY;
mgmt.u.action.u.sa_query_req.action = WLAN_SA_QUERY_REQUEST;
os_memcpy(mgmt.u.action.u.sa_query_req.trans_id, trans_id,
WLAN_SA_QUERY_TR_ID_LEN);
end = mgmt.u.action.u.sa_query_req.trans_id + WLAN_SA_QUERY_TR_ID_LEN;
if (hostapd_drv_send_mlme(hapd, &mgmt, end - (u8 *) &mgmt, 0) < 0)
perror("ieee802_11_send_sa_query_req: send");
}
static void ieee802_11_send_sa_query_resp(struct hostapd_data *hapd,
const u8 *sa, const u8 *trans_id)
{
struct sta_info *sta;
struct ieee80211_mgmt resp;
u8 *end;
wpa_printf(MSG_DEBUG, "IEEE 802.11: Received SA Query Request from "
MACSTR, MAC2STR(sa));
wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
trans_id, WLAN_SA_QUERY_TR_ID_LEN);
sta = ap_get_sta(hapd, sa);
if (sta == NULL || !(sta->flags & WLAN_STA_ASSOC)) {
wpa_printf(MSG_DEBUG, "IEEE 802.11: Ignore SA Query Request "
"from unassociated STA " MACSTR, MAC2STR(sa));
return;
}
wpa_printf(MSG_DEBUG, "IEEE 802.11: Sending SA Query Response to "
MACSTR, MAC2STR(sa));
os_memset(&resp, 0, sizeof(resp));
resp.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_ACTION);
os_memcpy(resp.da, sa, ETH_ALEN);
os_memcpy(resp.sa, hapd->own_addr, ETH_ALEN);
os_memcpy(resp.bssid, hapd->own_addr, ETH_ALEN);
resp.u.action.category = WLAN_ACTION_SA_QUERY;
resp.u.action.u.sa_query_req.action = WLAN_SA_QUERY_RESPONSE;
os_memcpy(resp.u.action.u.sa_query_req.trans_id, trans_id,
WLAN_SA_QUERY_TR_ID_LEN);
end = resp.u.action.u.sa_query_req.trans_id + WLAN_SA_QUERY_TR_ID_LEN;
if (hostapd_drv_send_mlme(hapd, &resp, end - (u8 *) &resp, 0) < 0)
perror("ieee80211_mgmt_sa_query_request: send");
}
void ieee802_11_sa_query_action(struct hostapd_data *hapd, const u8 *sa,
const u8 action_type, const u8 *trans_id)
{
struct sta_info *sta;
int i;
if (action_type == WLAN_SA_QUERY_REQUEST) {
ieee802_11_send_sa_query_resp(hapd, sa, trans_id);
return;
}
if (action_type != WLAN_SA_QUERY_RESPONSE) {
wpa_printf(MSG_DEBUG, "IEEE 802.11: Unexpected SA Query "
"Action %d", action_type);
return;
}
wpa_printf(MSG_DEBUG, "IEEE 802.11: Received SA Query Response from "
MACSTR, MAC2STR(sa));
wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
trans_id, WLAN_SA_QUERY_TR_ID_LEN);
/* MLME-SAQuery.confirm */
sta = ap_get_sta(hapd, sa);
if (sta == NULL || sta->sa_query_trans_id == NULL) {
wpa_printf(MSG_DEBUG, "IEEE 802.11: No matching STA with "
"pending SA Query request found");
return;
}
for (i = 0; i < sta->sa_query_count; i++) {
if (os_memcmp(sta->sa_query_trans_id +
i * WLAN_SA_QUERY_TR_ID_LEN,
trans_id, WLAN_SA_QUERY_TR_ID_LEN) == 0)
break;
}
if (i >= sta->sa_query_count) {
wpa_printf(MSG_DEBUG, "IEEE 802.11: No matching SA Query "
"transaction identifier found");
return;
}
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"Reply to pending SA Query received");
ap_sta_stop_sa_query(hapd, sta);
}
#endif /* CONFIG_IEEE80211W */
u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
u8 len = 0;
if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
len = 5;
if (len < 4 && hapd->conf->interworking)
len = 4;
if (len == 0)
return eid;
*pos++ = WLAN_EID_EXT_CAPAB;
*pos++ = len;
*pos++ = 0x00;
*pos++ = 0x00;
*pos++ = 0x00;
*pos = 0x00;
if (hapd->conf->time_advertisement == 2)
*pos |= 0x08; /* Bit 27 - UTC TSF Offset */
if (hapd->conf->interworking)
*pos |= 0x80; /* Bit 31 - Interworking */
pos++;
if (len < 5)
return pos;
*pos = 0x00;
if (hapd->conf->tdls & TDLS_PROHIBIT)
*pos |= 0x40; /* Bit 38 - TDLS Prohibited */
if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH)
*pos |= 0x80; /* Bit 39 - TDLS Channel Switching Prohibited */
pos++;
return pos;
}
u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
#ifdef CONFIG_INTERWORKING
u8 *len;
if (!hapd->conf->interworking)
return eid;
*pos++ = WLAN_EID_INTERWORKING;
len = pos++;
*pos = hapd->conf->access_network_type;
if (hapd->conf->internet)
*pos |= INTERWORKING_ANO_INTERNET;
if (hapd->conf->asra)
*pos |= INTERWORKING_ANO_ASRA;
if (hapd->conf->esr)
*pos |= INTERWORKING_ANO_ESR;
if (hapd->conf->uesa)
*pos |= INTERWORKING_ANO_UESA;
pos++;
if (hapd->conf->venue_info_set) {
*pos++ = hapd->conf->venue_group;
*pos++ = hapd->conf->venue_type;
}
if (!is_zero_ether_addr(hapd->conf->hessid)) {
os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
pos += ETH_ALEN;
}
*len = pos - len - 1;
#endif /* CONFIG_INTERWORKING */
return pos;
}
u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
#ifdef CONFIG_INTERWORKING
/* TODO: Separate configuration for ANQP? */
if (!hapd->conf->interworking)
return eid;
*pos++ = WLAN_EID_ADV_PROTO;
*pos++ = 2;
*pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
*pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
#endif /* CONFIG_INTERWORKING */
return pos;
}
u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
#ifdef CONFIG_INTERWORKING
u8 *len;
unsigned int i, count;
if (!hapd->conf->interworking ||
hapd->conf->roaming_consortium == NULL ||
hapd->conf->roaming_consortium_count == 0)
return eid;
*pos++ = WLAN_EID_ROAMING_CONSORTIUM;
len = pos++;
/* Number of ANQP OIs (in addition to the max 3 listed here) */
if (hapd->conf->roaming_consortium_count > 3 + 255)
*pos++ = 255;
else if (hapd->conf->roaming_consortium_count > 3)
*pos++ = hapd->conf->roaming_consortium_count - 3;
else
*pos++ = 0;
/* OU #1 and #2 Lengths */
*pos = hapd->conf->roaming_consortium[0].len;
if (hapd->conf->roaming_consortium_count > 1)
*pos |= hapd->conf->roaming_consortium[1].len << 4;
pos++;
if (hapd->conf->roaming_consortium_count > 3)
count = 3;
else
count = hapd->conf->roaming_consortium_count;
for (i = 0; i < count; i++) {
os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
hapd->conf->roaming_consortium[i].len);
pos += hapd->conf->roaming_consortium[i].len;
}
*len = pos - len - 1;
#endif /* CONFIG_INTERWORKING */
return pos;
}
u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
{
if (hapd->conf->time_advertisement != 2)
return eid;
if (hapd->time_adv == NULL &&
hostapd_update_time_adv(hapd) < 0)
return eid;
if (hapd->time_adv == NULL)
return eid;
os_memcpy(eid, wpabuf_head(hapd->time_adv),
wpabuf_len(hapd->time_adv));
eid += wpabuf_len(hapd->time_adv);
return eid;
}
u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
{
size_t len;
if (hapd->conf->time_advertisement != 2)
return eid;
len = os_strlen(hapd->conf->time_zone);
*eid++ = WLAN_EID_TIME_ZONE;
*eid++ = len;
os_memcpy(eid, hapd->conf->time_zone, len);
eid += len;
return eid;
}
int hostapd_update_time_adv(struct hostapd_data *hapd)
{
const int elen = 2 + 1 + 10 + 5 + 1;
struct os_time t;
struct os_tm tm;
u8 *pos;
if (hapd->conf->time_advertisement != 2)
return 0;
if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
return -1;
if (!hapd->time_adv) {
hapd->time_adv = wpabuf_alloc(elen);
if (hapd->time_adv == NULL)
return -1;
pos = wpabuf_put(hapd->time_adv, elen);
} else
pos = wpabuf_mhead_u8(hapd->time_adv);
*pos++ = WLAN_EID_TIME_ADVERTISEMENT;
*pos++ = 1 + 10 + 5 + 1;
*pos++ = 2; /* UTC time at which the TSF timer is 0 */
/* Time Value at TSF 0 */
/* FIX: need to calculate this based on the current TSF value */
WPA_PUT_LE16(pos, tm.year); /* Year */
pos += 2;
*pos++ = tm.month; /* Month */
*pos++ = tm.day; /* Day of month */
*pos++ = tm.hour; /* Hours */
*pos++ = tm.min; /* Minutes */
*pos++ = tm.sec; /* Seconds */
WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
pos += 2;
*pos++ = 0; /* Reserved */
/* Time Error */
/* TODO: fill in an estimate on the error */
*pos++ = 0;
*pos++ = 0;
*pos++ = 0;
*pos++ = 0;
*pos++ = 0;
*pos++ = hapd->time_update_counter++;
return 0;
}
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