/*
* hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response
* Copyright (c) 2002-2004, Instant802 Networks, Inc.
* Copyright (c) 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2008-2012, 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"
#ifndef CONFIG_NATIVE_WINDOWS
#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "wps/wps_defs.h"
#include "p2p/p2p.h"
#include "hostapd.h"
#include "ieee802_11.h"
#include "wpa_auth.h"
#include "wmm.h"
#include "ap_config.h"
#include "sta_info.h"
#include "p2p_hostapd.h"
#include "ap_drv_ops.h"
#include "beacon.h"
#include "hs20.h"
#include "dfs.h"
#ifdef NEED_AP_MLME
static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
{
#ifdef CONFIG_TESTING_OPTIONS
if (hapd->conf->bss_load_test_set) {
if (2 + 5 > len)
return eid;
*eid++ = WLAN_EID_BSS_LOAD;
*eid++ = 5;
os_memcpy(eid, hapd->conf->bss_load_test, 5);
eid += 5;
}
#endif /* CONFIG_TESTING_OPTIONS */
return eid;
}
static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
{
u8 erp = 0;
if (hapd->iface->current_mode == NULL ||
hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
return 0;
if (hapd->iface->olbc)
erp |= ERP_INFO_USE_PROTECTION;
if (hapd->iface->num_sta_non_erp > 0) {
erp |= ERP_INFO_NON_ERP_PRESENT |
ERP_INFO_USE_PROTECTION;
}
if (hapd->iface->num_sta_no_short_preamble > 0 ||
hapd->iconf->preamble == LONG_PREAMBLE)
erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
return erp;
}
static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
{
*eid++ = WLAN_EID_DS_PARAMS;
*eid++ = 1;
*eid++ = hapd->iconf->channel;
return eid;
}
static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
{
if (hapd->iface->current_mode == NULL ||
hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
return eid;
/* Set NonERP_present and use_protection bits if there
* are any associated NonERP stations. */
/* TODO: use_protection bit can be set to zero even if
* there are NonERP stations present. This optimization
* might be useful if NonERP stations are "quiet".
* See 802.11g/D6 E-1 for recommended practice.
* In addition, Non ERP present might be set, if AP detects Non ERP
* operation on other APs. */
/* Add ERP Information element */
*eid++ = WLAN_EID_ERP_INFO;
*eid++ = 1;
*eid++ = ieee802_11_erp_info(hapd);
return eid;
}
static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
u8 local_pwr_constraint = 0;
int dfs;
if (hapd->iface->current_mode == NULL ||
hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
return eid;
/* Let host drivers add this IE if DFS support is offloaded */
if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
return eid;
/*
* There is no DFS support and power constraint was not directly
* requested by config option.
*/
if (!hapd->iconf->ieee80211h &&
hapd->iconf->local_pwr_constraint == -1)
return eid;
/* Check if DFS is required by regulatory. */
dfs = hostapd_is_dfs_required(hapd->iface);
if (dfs < 0) {
wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
dfs);
dfs = 0;
}
if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
return eid;
/*
* ieee80211h (DFS) is enabled so Power Constraint element shall
* be added when running on DFS channel whenever local_pwr_constraint
* is configured or not. In order to meet regulations when TPC is not
* implemented using a transmit power that is below the legal maximum
* (including any mitigation factor) should help. In this case,
* indicate 3 dB below maximum allowed transmit power.
*/
if (hapd->iconf->local_pwr_constraint == -1)
local_pwr_constraint = 3;
/*
* A STA that is not an AP shall use a transmit power less than or
* equal to the local maximum transmit power level for the channel.
* The local maximum transmit power can be calculated from the formula:
* local max TX pwr = max TX pwr - local pwr constraint
* Where max TX pwr is maximum transmit power level specified for
* channel in Country element and local pwr constraint is specified
* for channel in this Power Constraint element.
*/
/* Element ID */
*pos++ = WLAN_EID_PWR_CONSTRAINT;
/* Length */
*pos++ = 1;
/* Local Power Constraint */
if (local_pwr_constraint)
*pos++ = local_pwr_constraint;
else
*pos++ = hapd->iconf->local_pwr_constraint;
return pos;
}
static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
struct hostapd_channel_data *start,
struct hostapd_channel_data *prev)
{
if (end - pos < 3)
return pos;
/* first channel number */
*pos++ = start->chan;
/* number of channels */
*pos++ = (prev->chan - start->chan) / chan_spacing + 1;
/* maximum transmit power level */
*pos++ = start->max_tx_power;
return pos;
}
static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
int max_len)
{
u8 *pos = eid;
u8 *end = eid + max_len;
int i;
struct hostapd_hw_modes *mode;
struct hostapd_channel_data *start, *prev;
int chan_spacing = 1;
if (!hapd->iconf->ieee80211d || max_len < 6 ||
hapd->iface->current_mode == NULL)
return eid;
*pos++ = WLAN_EID_COUNTRY;
pos++; /* length will be set later */
os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
pos += 3;
mode = hapd->iface->current_mode;
if (mode->mode == HOSTAPD_MODE_IEEE80211A)
chan_spacing = 4;
start = prev = NULL;
for (i = 0; i < mode->num_channels; i++) {
struct hostapd_channel_data *chan = &mode->channels[i];
if (chan->flag & HOSTAPD_CHAN_DISABLED)
continue;
if (start && prev &&
prev->chan + chan_spacing == chan->chan &&
start->max_tx_power == chan->max_tx_power) {
prev = chan;
continue; /* can use same entry */
}
if (start && prev) {
pos = hostapd_eid_country_add(pos, end, chan_spacing,
start, prev);
start = NULL;
}
/* Start new group */
start = prev = chan;
}
if (start) {
pos = hostapd_eid_country_add(pos, end, chan_spacing,
start, prev);
}
if ((pos - eid) & 1) {
if (end - pos < 1)
return eid;
*pos++ = 0; /* pad for 16-bit alignment */
}
eid[1] = (pos - eid) - 2;
return pos;
}
static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
{
const u8 *ie;
size_t ielen;
ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
if (ie == NULL || ielen > len)
return eid;
os_memcpy(eid, ie, ielen);
return eid + ielen;
}
static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
{
u8 chan;
if (!hapd->cs_freq_params.freq)
return eid;
if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
NUM_HOSTAPD_MODES)
return eid;
*eid++ = WLAN_EID_CHANNEL_SWITCH;
*eid++ = 3;
*eid++ = hapd->cs_block_tx;
*eid++ = chan;
*eid++ = hapd->cs_count;
return eid;
}
static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
{
u8 sec_ch;
if (!hapd->cs_freq_params.sec_channel_offset)
return eid;
if (hapd->cs_freq_params.sec_channel_offset == -1)
sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
else if (hapd->cs_freq_params.sec_channel_offset == 1)
sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
else
return eid;
*eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
*eid++ = 1;
*eid++ = sec_ch;
return eid;
}
static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
u8 *start, unsigned int *csa_counter_off)
{
u8 *old_pos = pos;
if (!csa_counter_off)
return pos;
*csa_counter_off = 0;
pos = hostapd_eid_csa(hapd, pos);
if (pos != old_pos) {
/* save an offset to the counter - should be last byte */
*csa_counter_off = pos - start - 1;
pos = hostapd_eid_secondary_channel(hapd, pos);
}
return pos;
}
static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
struct sta_info *sta,
const struct ieee80211_mgmt *req,
int is_p2p, size_t *resp_len)
{
struct ieee80211_mgmt *resp;
u8 *pos, *epos;
size_t buflen;
#define MAX_PROBERESP_LEN 768
buflen = MAX_PROBERESP_LEN;
#ifdef CONFIG_WPS
if (hapd->wps_probe_resp_ie)
buflen += wpabuf_len(hapd->wps_probe_resp_ie);
#endif /* CONFIG_WPS */
#ifdef CONFIG_P2P
if (hapd->p2p_probe_resp_ie)
buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
#endif /* CONFIG_P2P */
if (hapd->conf->vendor_elements)
buflen += wpabuf_len(hapd->conf->vendor_elements);
resp = os_zalloc(buflen);
if (resp == NULL)
return NULL;
epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_PROBE_RESP);
if (req)
os_memcpy(resp->da, req->sa, ETH_ALEN);
os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
resp->u.probe_resp.beacon_int =
host_to_le16(hapd->iconf->beacon_int);
/* hardware or low-level driver will setup seq_ctrl and timestamp */
resp->u.probe_resp.capab_info =
host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
pos = resp->u.probe_resp.variable;
*pos++ = WLAN_EID_SSID;
*pos++ = hapd->conf->ssid.ssid_len;
os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
pos += hapd->conf->ssid.ssid_len;
/* Supported rates */
pos = hostapd_eid_supp_rates(hapd, pos);
/* DS Params */
pos = hostapd_eid_ds_params(hapd, pos);
pos = hostapd_eid_country(hapd, pos, epos - pos);
/* Power Constraint element */
pos = hostapd_eid_pwr_constraint(hapd, pos);
/* ERP Information element */
pos = hostapd_eid_erp_info(hapd, pos);
/* Extended supported rates */
pos = hostapd_eid_ext_supp_rates(hapd, pos);
/* RSN, MDIE, WPA */
pos = hostapd_eid_wpa(hapd, pos, epos - pos);
pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
#ifdef CONFIG_IEEE80211N
pos = hostapd_eid_ht_capabilities(hapd, pos);
pos = hostapd_eid_ht_operation(hapd, pos);
#endif /* CONFIG_IEEE80211N */
pos = hostapd_eid_ext_capab(hapd, pos);
pos = hostapd_eid_time_adv(hapd, pos);
pos = hostapd_eid_time_zone(hapd, pos);
pos = hostapd_eid_interworking(hapd, pos);
pos = hostapd_eid_adv_proto(hapd, pos);
pos = hostapd_eid_roaming_consortium(hapd, pos);
pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
&hapd->cs_c_off_proberesp);
#ifdef CONFIG_IEEE80211AC
pos = hostapd_eid_vht_capabilities(hapd, pos);
pos = hostapd_eid_vht_operation(hapd, pos);
#endif /* CONFIG_IEEE80211AC */
/* Wi-Fi Alliance WMM */
pos = hostapd_eid_wmm(hapd, pos);
#ifdef CONFIG_WPS
if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
wpabuf_len(hapd->wps_probe_resp_ie));
pos += wpabuf_len(hapd->wps_probe_resp_ie);
}
#endif /* CONFIG_WPS */
#ifdef CONFIG_P2P
if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
hapd->p2p_probe_resp_ie) {
os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
wpabuf_len(hapd->p2p_probe_resp_ie));
pos += wpabuf_len(hapd->p2p_probe_resp_ie);
}
#endif /* CONFIG_P2P */
#ifdef CONFIG_P2P_MANAGER
if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
P2P_MANAGE)
pos = hostapd_eid_p2p_manage(hapd, pos);
#endif /* CONFIG_P2P_MANAGER */
#ifdef CONFIG_HS20
pos = hostapd_eid_hs20_indication(hapd, pos);
pos = hostapd_eid_osen(hapd, pos);
#endif /* CONFIG_HS20 */
if (hapd->conf->vendor_elements) {
os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
wpabuf_len(hapd->conf->vendor_elements));
pos += wpabuf_len(hapd->conf->vendor_elements);
}
*resp_len = pos - (u8 *) resp;
return (u8 *) resp;
}
enum ssid_match_result {
NO_SSID_MATCH,
EXACT_SSID_MATCH,
WILDCARD_SSID_MATCH
};
static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
const u8 *ssid, size_t ssid_len,
const u8 *ssid_list,
size_t ssid_list_len)
{
const u8 *pos, *end;
int wildcard = 0;
if (ssid_len == 0)
wildcard = 1;
if (ssid_len == hapd->conf->ssid.ssid_len &&
os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
return EXACT_SSID_MATCH;
if (ssid_list == NULL)
return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
pos = ssid_list;
end = ssid_list + ssid_list_len;
while (pos + 1 <= end) {
if (pos + 2 + pos[1] > end)
break;
if (pos[1] == 0)
wildcard = 1;
if (pos[1] == hapd->conf->ssid.ssid_len &&
os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
return EXACT_SSID_MATCH;
pos += 2 + pos[1];
}
return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
}
void handle_probe_req(struct hostapd_data *hapd,
const struct ieee80211_mgmt *mgmt, size_t len,
int ssi_signal)
{
u8 *resp;
struct ieee802_11_elems elems;
const u8 *ie;
size_t ie_len;
struct sta_info *sta = NULL;
size_t i, resp_len;
int noack;
enum ssid_match_result res;
ie = mgmt->u.probe_req.variable;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
return;
ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
mgmt->sa, mgmt->da, mgmt->bssid,
ie, ie_len, ssi_signal) > 0)
return;
if (!hapd->iconf->send_probe_response)
return;
if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
MAC2STR(mgmt->sa));
return;
}
if ((!elems.ssid || !elems.supp_rates)) {
wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
"without SSID or supported rates element",
MAC2STR(mgmt->sa));
return;
}
#ifdef CONFIG_P2P
if (hapd->p2p && elems.wps_ie) {
struct wpabuf *wps;
wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
"due to mismatch with Requested Device "
"Type");
wpabuf_free(wps);
return;
}
wpabuf_free(wps);
}
if (hapd->p2p && elems.p2p) {
struct wpabuf *p2p;
p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
"due to mismatch with Device ID");
wpabuf_free(p2p);
return;
}
wpabuf_free(p2p);
}
#endif /* CONFIG_P2P */
if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
elems.ssid_list_len == 0) {
wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
"broadcast SSID ignored", MAC2STR(mgmt->sa));
return;
}
sta = ap_get_sta(hapd, mgmt->sa);
#ifdef CONFIG_P2P
if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
P2P_WILDCARD_SSID_LEN) == 0) {
/* Process P2P Wildcard SSID like Wildcard SSID */
elems.ssid_len = 0;
}
#endif /* CONFIG_P2P */
res = ssid_match(hapd, elems.ssid, elems.ssid_len,
elems.ssid_list, elems.ssid_list_len);
if (res != NO_SSID_MATCH) {
if (sta)
sta->ssid_probe = &hapd->conf->ssid;
} else {
if (!(mgmt->da[0] & 0x01)) {
wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
" for foreign SSID '%s' (DA " MACSTR ")%s",
MAC2STR(mgmt->sa),
wpa_ssid_txt(elems.ssid, elems.ssid_len),
MAC2STR(mgmt->da),
elems.ssid_list ? " (SSID list)" : "");
}
return;
}
#ifdef CONFIG_INTERWORKING
if (hapd->conf->interworking &&
elems.interworking && elems.interworking_len >= 1) {
u8 ant = elems.interworking[0] & 0x0f;
if (ant != INTERWORKING_ANT_WILDCARD &&
ant != hapd->conf->access_network_type) {
wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
" for mismatching ANT %u ignored",
MAC2STR(mgmt->sa), ant);
return;
}
}
if (hapd->conf->interworking && elems.interworking &&
(elems.interworking_len == 7 || elems.interworking_len == 9)) {
const u8 *hessid;
if (elems.interworking_len == 7)
hessid = elems.interworking + 1;
else
hessid = elems.interworking + 1 + 2;
if (!is_broadcast_ether_addr(hessid) &&
os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
" for mismatching HESSID " MACSTR
" ignored",
MAC2STR(mgmt->sa), MAC2STR(hessid));
return;
}
}
#endif /* CONFIG_INTERWORKING */
#ifdef CONFIG_P2P
if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
supp_rates_11b_only(&elems)) {
/* Indicates support for 11b rates only */
wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
MACSTR " with only 802.11b rates",
MAC2STR(mgmt->sa));
return;
}
#endif /* CONFIG_P2P */
/* TODO: verify that supp_rates contains at least one matching rate
* with AP configuration */
#ifdef CONFIG_TESTING_OPTIONS
if (hapd->iconf->ignore_probe_probability > 0.0 &&
drand48() < hapd->iconf->ignore_probe_probability) {
wpa_printf(MSG_INFO,
"TESTING: ignoring probe request from " MACSTR,
MAC2STR(mgmt->sa));
return;
}
#endif /* CONFIG_TESTING_OPTIONS */
resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
&resp_len);
if (resp == NULL)
return;
/*
* If this is a broadcast probe request, apply no ack policy to avoid
* excessive retries.
*/
noack = !!(res == WILDCARD_SSID_MATCH &&
is_broadcast_ether_addr(mgmt->da));
if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
wpa_printf(MSG_INFO, "handle_probe_req: send failed");
os_free(resp);
wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
"SSID", MAC2STR(mgmt->sa),
elems.ssid_len == 0 ? "broadcast" : "our");
}
static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
size_t *resp_len)
{
/* check probe response offloading caps and print warnings */
if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
return NULL;
#ifdef CONFIG_WPS
if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
(!(hapd->iface->probe_resp_offloads &
(WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
"Probe Response while not supporting this");
#endif /* CONFIG_WPS */
#ifdef CONFIG_P2P
if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
!(hapd->iface->probe_resp_offloads &
WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
"Probe Response while not supporting this");
#endif /* CONFIG_P2P */
if (hapd->conf->interworking &&
!(hapd->iface->probe_resp_offloads &
WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
wpa_printf(MSG_WARNING, "Device is trying to offload "
"Interworking Probe Response while not supporting "
"this");
/* Generate a Probe Response template for the non-P2P case */
return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
}
#endif /* NEED_AP_MLME */
int ieee802_11_build_ap_params(struct hostapd_data *hapd,
struct wpa_driver_ap_params *params)
{
struct ieee80211_mgmt *head = NULL;
u8 *tail = NULL;
size_t head_len = 0, tail_len = 0;
u8 *resp = NULL;
size_t resp_len = 0;
#ifdef NEED_AP_MLME
u16 capab_info;
u8 *pos, *tailpos;
#define BEACON_HEAD_BUF_SIZE 256
#define BEACON_TAIL_BUF_SIZE 512
head = os_zalloc(BEACON_HEAD_BUF_SIZE);
tail_len = BEACON_TAIL_BUF_SIZE;
#ifdef CONFIG_WPS
if (hapd->conf->wps_state && hapd->wps_beacon_ie)
tail_len += wpabuf_len(hapd->wps_beacon_ie);
#endif /* CONFIG_WPS */
#ifdef CONFIG_P2P
if (hapd->p2p_beacon_ie)
tail_len += wpabuf_len(hapd->p2p_beacon_ie);
#endif /* CONFIG_P2P */
if (hapd->conf->vendor_elements)
tail_len += wpabuf_len(hapd->conf->vendor_elements);
tailpos = tail = os_malloc(tail_len);
if (head == NULL || tail == NULL) {
wpa_printf(MSG_ERROR, "Failed to set beacon data");
os_free(head);
os_free(tail);
return -1;
}
head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_BEACON);
head->duration = host_to_le16(0);
os_memset(head->da, 0xff, ETH_ALEN);
os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
head->u.beacon.beacon_int =
host_to_le16(hapd->iconf->beacon_int);
/* hardware or low-level driver will setup seq_ctrl and timestamp */
capab_info = hostapd_own_capab_info(hapd, NULL, 0);
head->u.beacon.capab_info = host_to_le16(capab_info);
pos = &head->u.beacon.variable[0];
/* SSID */
*pos++ = WLAN_EID_SSID;
if (hapd->conf->ignore_broadcast_ssid == 2) {
/* clear the data, but keep the correct length of the SSID */
*pos++ = hapd->conf->ssid.ssid_len;
os_memset(pos, 0, hapd->conf->ssid.ssid_len);
pos += hapd->conf->ssid.ssid_len;
} else if (hapd->conf->ignore_broadcast_ssid) {
*pos++ = 0; /* empty SSID */
} else {
*pos++ = hapd->conf->ssid.ssid_len;
os_memcpy(pos, hapd->conf->ssid.ssid,
hapd->conf->ssid.ssid_len);
pos += hapd->conf->ssid.ssid_len;
}
/* Supported rates */
pos = hostapd_eid_supp_rates(hapd, pos);
/* DS Params */
pos = hostapd_eid_ds_params(hapd, pos);
head_len = pos - (u8 *) head;
tailpos = hostapd_eid_country(hapd, tailpos,
tail + BEACON_TAIL_BUF_SIZE - tailpos);
/* Power Constraint element */
tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
/* ERP Information element */
tailpos = hostapd_eid_erp_info(hapd, tailpos);
/* Extended supported rates */
tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
/* RSN, MDIE, WPA */
tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
tailpos);
tailpos = hostapd_eid_bss_load(hapd, tailpos,
tail + BEACON_TAIL_BUF_SIZE - tailpos);
#ifdef CONFIG_IEEE80211N
tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
tailpos = hostapd_eid_ht_operation(hapd, tailpos);
#endif /* CONFIG_IEEE80211N */
tailpos = hostapd_eid_ext_capab(hapd, tailpos);
/*
* TODO: Time Advertisement element should only be included in some
* DTIM Beacon frames.
*/
tailpos = hostapd_eid_time_adv(hapd, tailpos);
tailpos = hostapd_eid_interworking(hapd, tailpos);
tailpos = hostapd_eid_adv_proto(hapd, tailpos);
tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
&hapd->cs_c_off_beacon);
#ifdef CONFIG_IEEE80211AC
tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
tailpos = hostapd_eid_vht_operation(hapd, tailpos);
#endif /* CONFIG_IEEE80211AC */
/* Wi-Fi Alliance WMM */
tailpos = hostapd_eid_wmm(hapd, tailpos);
#ifdef CONFIG_WPS
if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
wpabuf_len(hapd->wps_beacon_ie));
tailpos += wpabuf_len(hapd->wps_beacon_ie);
}
#endif /* CONFIG_WPS */
#ifdef CONFIG_P2P
if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
wpabuf_len(hapd->p2p_beacon_ie));
tailpos += wpabuf_len(hapd->p2p_beacon_ie);
}
#endif /* CONFIG_P2P */
#ifdef CONFIG_P2P_MANAGER
if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
P2P_MANAGE)
tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
#endif /* CONFIG_P2P_MANAGER */
#ifdef CONFIG_HS20
tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
tailpos = hostapd_eid_osen(hapd, tailpos);
#endif /* CONFIG_HS20 */
if (hapd->conf->vendor_elements) {
os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
wpabuf_len(hapd->conf->vendor_elements));
tailpos += wpabuf_len(hapd->conf->vendor_elements);
}
tail_len = tailpos > tail ? tailpos - tail : 0;
resp = hostapd_probe_resp_offloads(hapd, &resp_len);
#endif /* NEED_AP_MLME */
os_memset(params, 0, sizeof(*params));
params->head = (u8 *) head;
params->head_len = head_len;
params->tail = tail;
params->tail_len = tail_len;
params->proberesp = resp;
params->proberesp_len = resp_len;
params->dtim_period = hapd->conf->dtim_period;
params->beacon_int = hapd->iconf->beacon_int;
params->basic_rates = hapd->iface->basic_rates;
params->ssid = hapd->conf->ssid.ssid;
params->ssid_len = hapd->conf->ssid.ssid_len;
params->pairwise_ciphers = hapd->conf->wpa_pairwise |
hapd->conf->rsn_pairwise;
params->group_cipher = hapd->conf->wpa_group;
params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
params->auth_algs = hapd->conf->auth_algs;
params->wpa_version = hapd->conf->wpa;
params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
(hapd->conf->ieee802_1x &&
(hapd->conf->default_wep_key_len ||
hapd->conf->individual_wep_key_len));
switch (hapd->conf->ignore_broadcast_ssid) {
case 0:
params->hide_ssid = NO_SSID_HIDING;
break;
case 1:
params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
break;
case 2:
params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
break;
}
params->isolate = hapd->conf->isolate;
#ifdef NEED_AP_MLME
params->cts_protect = !!(ieee802_11_erp_info(hapd) &
ERP_INFO_USE_PROTECTION);
params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
hapd->iconf->preamble == SHORT_PREAMBLE;
if (hapd->iface->current_mode &&
hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
params->short_slot_time =
hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
else
params->short_slot_time = -1;
if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
params->ht_opmode = -1;
else
params->ht_opmode = hapd->iface->ht_op_mode;
#endif /* NEED_AP_MLME */
params->interworking = hapd->conf->interworking;
if (hapd->conf->interworking &&
!is_zero_ether_addr(hapd->conf->hessid))
params->hessid = hapd->conf->hessid;
params->access_network_type = hapd->conf->access_network_type;
params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
#ifdef CONFIG_HS20
params->disable_dgaf = hapd->conf->disable_dgaf;
if (hapd->conf->osen) {
params->privacy = 1;
params->osen = 1;
}
#endif /* CONFIG_HS20 */
return 0;
}
void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
{
os_free(params->tail);
params->tail = NULL;
os_free(params->head);
params->head = NULL;
os_free(params->proberesp);
params->proberesp = NULL;
}
int ieee802_11_set_beacon(struct hostapd_data *hapd)
{
struct wpa_driver_ap_params params;
struct hostapd_freq_params freq;
struct hostapd_iface *iface = hapd->iface;
struct hostapd_config *iconf = iface->conf;
struct wpabuf *beacon, *proberesp, *assocresp;
int res, ret = -1;
if (hapd->csa_in_progress) {
wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
return -1;
}
hapd->beacon_set_done = 1;
if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
return -1;
if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
0)
goto fail;
params.beacon_ies = beacon;
params.proberesp_ies = proberesp;
params.assocresp_ies = assocresp;
if (iface->current_mode &&
hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
iconf->channel, iconf->ieee80211n,
iconf->ieee80211ac,
iconf->secondary_channel,
iconf->vht_oper_chwidth,
iconf->vht_oper_centr_freq_seg0_idx,
iconf->vht_oper_centr_freq_seg1_idx,
iface->current_mode->vht_capab) == 0)
params.freq = &freq;
res = hostapd_drv_set_ap(hapd, ¶ms);
hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
if (res)
wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
else
ret = 0;
fail:
ieee802_11_free_ap_params(¶ms);
return ret;
}
int ieee802_11_set_beacons(struct hostapd_iface *iface)
{
size_t i;
int ret = 0;
for (i = 0; i < iface->num_bss; i++) {
if (iface->bss[i]->started &&
ieee802_11_set_beacon(iface->bss[i]) < 0)
ret = -1;
}
return ret;
}
/* only update beacons if started */
int ieee802_11_update_beacons(struct hostapd_iface *iface)
{
size_t i;
int ret = 0;
for (i = 0; i < iface->num_bss; i++) {
if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
ieee802_11_set_beacon(iface->bss[i]) < 0)
ret = -1;
}
return ret;
}
#endif /* CONFIG_NATIVE_WINDOWS */