hostap/wpa_supplicant/robust_av.c
Jouni Malinen 354f87e2e3 MSCS: Fix MSCS Response frame Status field parsing
This is a 2 octet field, so need to use WPA_GET_LE16() here instead of
using only the first octet of the value.

Fixes: bbd3178af4 ("MSCS: Add support to process MSCS Response frames")
Signed-off-by: Jouni Malinen <j@w1.fi>
2021-03-23 00:42:06 +02:00

155 lines
4.3 KiB
C

/*
* wpa_supplicant - Robust AV procedures
* Copyright (c) 2020, The Linux Foundation
*
* 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/wpa_ctrl.h"
#include "common/ieee802_11_common.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "bss.h"
void wpas_populate_mscs_descriptor_ie(struct robust_av_data *robust_av,
struct wpabuf *buf)
{
u8 *len, *len1;
/* MSCS descriptor element */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION);
len = wpabuf_put(buf, 1);
wpabuf_put_u8(buf, WLAN_EID_EXT_MSCS_DESCRIPTOR);
wpabuf_put_u8(buf, robust_av->request_type);
wpabuf_put_u8(buf, robust_av->up_bitmap);
wpabuf_put_u8(buf, robust_av->up_limit);
wpabuf_put_le32(buf, robust_av->stream_timeout);
if (robust_av->request_type != SCS_REQ_REMOVE) {
/* TCLAS mask element */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION);
len1 = wpabuf_put(buf, 1);
wpabuf_put_u8(buf, WLAN_EID_EXT_TCLAS_MASK);
/* Frame classifier */
wpabuf_put_data(buf, robust_av->frame_classifier,
robust_av->frame_classifier_len);
*len1 = (u8 *) wpabuf_put(buf, 0) - len1 - 1;
}
*len = (u8 *) wpabuf_put(buf, 0) - len - 1;
}
int wpas_send_mscs_req(struct wpa_supplicant *wpa_s)
{
struct wpabuf *buf;
size_t buf_len;
int ret;
if (wpa_s->wpa_state != WPA_COMPLETED || !wpa_s->current_ssid)
return 0;
if (!wpa_bss_ext_capab(wpa_s->current_bss, WLAN_EXT_CAPAB_MSCS)) {
wpa_dbg(wpa_s, MSG_INFO,
"AP does not support MSCS - could not send MSCS Req");
return -1;
}
if (!wpa_s->mscs_setup_done &&
wpa_s->robust_av.request_type != SCS_REQ_ADD) {
wpa_msg(wpa_s, MSG_INFO,
"MSCS: Failed to send MSCS Request: request type invalid");
return -1;
}
buf_len = 3 + /* Action frame header */
3 + /* MSCS descriptor IE header */
1 + /* Request type */
2 + /* User priority control */
4 + /* Stream timeout */
3 + /* TCLAS Mask IE header */
wpa_s->robust_av.frame_classifier_len;
buf = wpabuf_alloc(buf_len);
if (!buf) {
wpa_printf(MSG_ERROR, "Failed to allocate MSCS req");
return -1;
}
wpabuf_put_u8(buf, WLAN_ACTION_ROBUST_AV_STREAMING);
wpabuf_put_u8(buf, ROBUST_AV_MSCS_REQ);
wpa_s->robust_av.dialog_token++;
wpabuf_put_u8(buf, wpa_s->robust_av.dialog_token);
/* MSCS descriptor element */
wpas_populate_mscs_descriptor_ie(&wpa_s->robust_av, buf);
wpa_hexdump_buf(MSG_MSGDUMP, "MSCS Request", buf);
ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head(buf), wpabuf_len(buf), 0);
if (ret < 0)
wpa_dbg(wpa_s, MSG_INFO, "MSCS: Failed to send MSCS Request");
wpabuf_free(buf);
return ret;
}
void wpas_handle_robust_av_recv_action(struct wpa_supplicant *wpa_s,
const u8 *src, const u8 *buf, size_t len)
{
u8 dialog_token;
u16 status_code;
if (len < 3)
return;
dialog_token = *buf++;
if (dialog_token != wpa_s->robust_av.dialog_token) {
wpa_printf(MSG_INFO,
"MSCS: Drop received frame due to dialog token mismatch: received:%u expected:%u",
dialog_token, wpa_s->robust_av.dialog_token);
return;
}
status_code = WPA_GET_LE16(buf);
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_MSCS_RESULT "bssid=" MACSTR
" status_code=%u", MAC2STR(src), status_code);
wpa_s->mscs_setup_done = status_code == WLAN_STATUS_SUCCESS;
}
void wpas_handle_assoc_resp_mscs(struct wpa_supplicant *wpa_s, const u8 *bssid,
const u8 *ies, size_t ies_len)
{
const u8 *mscs_desc_ie, *mscs_status;
u16 status;
/* Process optional MSCS Status subelement when MSCS IE is in
* (Re)Association Response frame */
if (!ies || ies_len == 0 || !wpa_s->robust_av.valid_config)
return;
mscs_desc_ie = get_ie_ext(ies, ies_len, WLAN_EID_EXT_MSCS_DESCRIPTOR);
if (!mscs_desc_ie || mscs_desc_ie[1] <= 8)
return;
/* Subelements start after (ie_id(1) + ie_len(1) + ext_id(1) +
* request type(1) + upc(2) + stream timeout(4) =) 10.
*/
mscs_status = get_ie(&mscs_desc_ie[10], mscs_desc_ie[1] - 8,
MCSC_SUBELEM_STATUS);
if (!mscs_status || mscs_status[1] < 2)
return;
status = WPA_GET_LE16(mscs_status + 2);
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_MSCS_RESULT "bssid=" MACSTR
" status_code=%u", MAC2STR(bssid), status);
wpa_s->mscs_setup_done = status == WLAN_STATUS_SUCCESS;
}