mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-28 18:28:23 -05:00
245 lines
6.7 KiB
C
245 lines
6.7 KiB
C
/*
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* wpa_supplicant - WNM
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* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "common/ieee802_11_defs.h"
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#include "rsn_supp/wpa.h"
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#include "wpa_supplicant_i.h"
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#include "driver_i.h"
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#define MAX_TFS_IE_LEN 1024
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#ifdef CONFIG_IEEE80211V
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/* get the TFS IE from driver */
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static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
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u16 *buf_len, enum wnm_oper oper)
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{
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wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
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return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
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}
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/* set the TFS IE to driver */
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static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
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const u8 *addr, u8 *buf, u16 *buf_len,
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enum wnm_oper oper)
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{
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wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
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return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
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}
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/* MLME-SLEEPMODE.request */
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int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
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u8 action, u16 intval)
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{
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struct ieee80211_mgmt *mgmt;
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int res;
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size_t len;
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struct wnm_sleep_element *wnmsleep_ie;
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u8 *wnmtfs_ie;
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u8 wnmsleep_ie_len;
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u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
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enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
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WNM_SLEEP_TFS_REQ_IE_NONE;
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/* WNM-Sleep Mode IE */
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wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
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wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
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if (wnmsleep_ie == NULL)
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return -1;
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wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
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wnmsleep_ie->len = wnmsleep_ie_len - 2;
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wnmsleep_ie->action_type = action;
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wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
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wnmsleep_ie->intval = host_to_le16(intval);
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/* TFS IE(s) */
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wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
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if (wnmtfs_ie == NULL) {
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os_free(wnmsleep_ie);
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return -1;
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}
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if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
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tfs_oper)) {
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wnmtfs_ie_len = 0;
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os_free(wnmtfs_ie);
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wnmtfs_ie = NULL;
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}
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mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
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if (mgmt == NULL) {
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wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
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"WNM-Sleep Request action frame");
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return -1;
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}
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os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
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os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
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os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
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mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
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WLAN_FC_STYPE_ACTION);
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mgmt->u.action.category = WLAN_ACTION_WNM;
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mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
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os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
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wnmsleep_ie_len);
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/* copy TFS IE here */
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if (wnmtfs_ie_len > 0) {
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os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
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wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
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}
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len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
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wnmtfs_ie_len;
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res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
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wpa_s->own_addr, wpa_s->bssid,
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&mgmt->u.action.category, len, 0);
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if (res < 0)
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wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
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"(action=%d, intval=%d)", action, intval);
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os_free(wnmsleep_ie);
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os_free(wnmtfs_ie);
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os_free(mgmt);
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return res;
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}
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static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
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const u8 *frm, int len)
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{
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/*
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* Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
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* WNM-Sleep Mode IE | TFS Response IE
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*/
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u8 *pos = (u8 *) frm; /* point to action field */
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u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
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u8 gtk_len;
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struct wnm_sleep_element *wnmsleep_ie = NULL;
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/* multiple TFS Resp IE (assuming consecutive) */
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u8 *tfsresp_ie_start = NULL;
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u8 *tfsresp_ie_end = NULL;
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u16 tfsresp_ie_len = 0;
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wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
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frm[0], frm[1], key_len_total);
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pos += 4 + key_len_total;
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while (pos - frm < len) {
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u8 ie_len = *(pos + 1);
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if (*pos == WLAN_EID_WNMSLEEP)
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wnmsleep_ie = (struct wnm_sleep_element *) pos;
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else if (*pos == WLAN_EID_TFS_RESP) {
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if (!tfsresp_ie_start)
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tfsresp_ie_start = pos;
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tfsresp_ie_end = pos;
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} else
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wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
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pos += ie_len + 2;
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}
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if (!wnmsleep_ie) {
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wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
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return;
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}
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if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT) {
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wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
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"frame (action=%d, intval=%d)",
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wnmsleep_ie->action_type, wnmsleep_ie->intval);
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if (wnmsleep_ie->action_type == 0) {
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
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wpa_s->bssid, NULL, NULL);
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/* remove GTK/IGTK ?? */
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/* set the TFS Resp IE(s) */
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if (tfsresp_ie_start && tfsresp_ie_end &&
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tfsresp_ie_end - tfsresp_ie_start >= 0) {
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tfsresp_ie_len = (tfsresp_ie_end +
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tfsresp_ie_end[1] + 2) -
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tfsresp_ie_start;
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wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
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/*
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* pass the TFS Resp IE(s) to driver for
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* processing
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*/
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if (ieee80211_11_set_tfs_ie(
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wpa_s, wpa_s->bssid,
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tfsresp_ie_start,
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&tfsresp_ie_len,
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WNM_SLEEP_TFS_RESP_IE_SET))
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wpa_printf(MSG_DEBUG, "Fail to set "
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"TFS Resp IE");
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}
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} else if (wnmsleep_ie->action_type == 1) {
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,
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wpa_s->bssid, NULL, NULL);
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/* Install GTK/IGTK */
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do {
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/* point to key data field */
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u8 *ptr = (u8 *) frm + 1 + 1 + 2;
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while (ptr < (u8 *) frm + 4 + key_len_total) {
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if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
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gtk_len = *(ptr + 4);
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wpa_wnmsleep_install_key(
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wpa_s->wpa,
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WNM_SLEEP_SUBELEM_GTK,
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ptr);
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ptr += 13 + gtk_len;
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#ifdef CONFIG_IEEE80211W
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} else if (*ptr ==
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WNM_SLEEP_SUBELEM_IGTK) {
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wpa_wnmsleep_install_key(
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wpa_s->wpa,
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WNM_SLEEP_SUBELEM_IGTK,
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ptr);
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ptr += 10 + WPA_IGTK_LEN;
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#endif /* CONFIG_IEEE80211W */
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} else
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break; /* skip the loop */
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}
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} while(0);
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}
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} else {
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wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
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"(action=%d, intval=%d)",
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wnmsleep_ie->action_type, wnmsleep_ie->intval);
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if (wnmsleep_ie->action_type == 0)
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
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wpa_s->bssid, NULL, NULL);
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else if (wnmsleep_ie->action_type == 1)
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
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wpa_s->bssid, NULL, NULL);
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}
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}
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void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
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struct rx_action *action)
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{
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u8 *pos = (u8 *) action->data; /* point to action field */
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u8 act = *pos++;
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/* u8 dialog_token = *pos++; */
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switch (act) {
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case WNM_SLEEP_MODE_RESP:
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ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
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break;
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default:
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break;
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}
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}
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#endif /* CONFIG_IEEE80211V */
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