WNM: Add WNM-Sleep Mode implementation for AP

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Xi Chen 2012-02-26 17:25:55 +02:00 committed by Jouni Malinen
parent a884be9da1
commit d32d94dbf4
7 changed files with 432 additions and 0 deletions

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@ -165,6 +165,11 @@ NEED_AES_OMAC1=y
NEED_AES_UNWRAP=y NEED_AES_UNWRAP=y
endif endif
ifdef CONFIG_IEEE80211V
CFLAGS += -DCONFIG_IEEE80211V
OBJS += ../src/ap/wnm_ap.o
endif
ifdef CONFIG_IEEE80211N ifdef CONFIG_IEEE80211N
CFLAGS += -DCONFIG_IEEE80211N CFLAGS += -DCONFIG_IEEE80211N
endif endif

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@ -16,6 +16,7 @@
#include "crypto/random.h" #include "crypto/random.h"
#include "p2p/p2p.h" #include "p2p/p2p.h"
#include "wps/wps.h" #include "wps/wps.h"
#include "wnm_ap.h"
#include "hostapd.h" #include "hostapd.h"
#include "ieee802_11.h" #include "ieee802_11.h"
#include "sta_info.h" #include "sta_info.h"
@ -502,6 +503,13 @@ static void hostapd_action_rx(struct hostapd_data *hapd,
action->data + 2); action->data + 2);
} }
#endif /* CONFIG_IEEE80211W */ #endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_IEEE80211V
if (action->category == WLAN_ACTION_WNM) {
wpa_printf(MSG_DEBUG, "%s: WNM_ACTION length %d",
__func__, (int) action->len);
ieee802_11_rx_wnm_action_ap(hapd, action);
}
#endif /* CONFIG_IEEE80211V */
} }

258
src/ap/wnm_ap.c Normal file
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@ -0,0 +1,258 @@
/*
* hostapd - WNM
* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
*
* 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 "ap/hostapd.h"
#include "ap/sta_info.h"
#include "ap/ap_config.h"
#include "ap/ap_drv_ops.h"
#include "ap/wpa_auth.h"
#include "wnm_ap.h"
#define MAX_TFS_IE_LEN 1024
#ifdef CONFIG_IEEE80211V
/* get the TFS IE from driver */
static int ieee80211_11_get_tfs_ie(struct hostapd_data *hapd, const u8 *addr,
u8 *buf, u16 *buf_len, enum wnm_oper oper)
{
wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
return hostapd_drv_wnm_oper(hapd, oper, addr, buf, buf_len);
}
/* set the TFS IE to driver */
static int ieee80211_11_set_tfs_ie(struct hostapd_data *hapd, const u8 *addr,
u8 *buf, u16 *buf_len, enum wnm_oper oper)
{
wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
return hostapd_drv_wnm_oper(hapd, oper, addr, buf, buf_len);
}
/* MLME-SLEEPMODE.response */
static int ieee802_11_send_wnmsleep_resp(struct hostapd_data *hapd,
const u8 *addr, u8 dialog_token,
u8 action_type, u16 intval)
{
struct ieee80211_mgmt *mgmt;
int res;
size_t len;
size_t gtk_elem_len = 0;
size_t igtk_elem_len = 0;
struct wnm_sleep_element wnmsleep_ie;
u8 *wnmtfs_ie;
u8 wnmsleep_ie_len;
u16 wnmtfs_ie_len;
u8 *pos;
struct sta_info *sta;
enum wnm_oper tfs_oper = action_type == 0 ? WNM_SLEEP_TFS_RESP_IE_ADD :
WNM_SLEEP_TFS_RESP_IE_NONE;
sta = ap_get_sta(hapd, addr);
if (sta == NULL) {
wpa_printf(MSG_DEBUG, "%s: station not found", __func__);
return -EINVAL;
}
/* WNM-Sleep Mode IE */
os_memset(&wnmsleep_ie, 0, sizeof(struct wnm_sleep_element));
wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
wnmsleep_ie.eid = WLAN_EID_WNMSLEEP;
wnmsleep_ie.len = wnmsleep_ie_len - 2;
wnmsleep_ie.action_type = action_type;
wnmsleep_ie.status = WNM_STATUS_SLEEP_ACCEPT;
wnmsleep_ie.intval = intval;
/* TFS IE(s) */
wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
if (wnmtfs_ie == NULL)
return -1;
if (ieee80211_11_get_tfs_ie(hapd, addr, wnmtfs_ie, &wnmtfs_ie_len,
tfs_oper)) {
wnmtfs_ie_len = 0;
os_free(wnmtfs_ie);
wnmtfs_ie = NULL;
}
#define MAX_GTK_SUBELEM_LEN 45
#define MAX_IGTK_SUBELEM_LEN 26
mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len +
MAX_GTK_SUBELEM_LEN + MAX_IGTK_SUBELEM_LEN);
if (mgmt == NULL) {
wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
"WNM-Sleep Response action frame");
return -1;
}
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->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_ACTION);
mgmt->u.action.category = WLAN_ACTION_WNM;
mgmt->u.action.u.wnm_sleep_resp.action = WNM_SLEEP_MODE_RESP;
mgmt->u.action.u.wnm_sleep_resp.dialogtoken = dialog_token;
pos = (u8 *)mgmt->u.action.u.wnm_sleep_resp.variable;
/* add key data if MFP is enabled */
if (wpa_auth_uses_mfp(sta->wpa_sm) || action_type != 1){
mgmt->u.action.u.wnm_sleep_resp.keydata_len = 0;
} else {
gtk_elem_len = wpa_wnmsleep_gtk_subelem(sta->wpa_sm, pos);
pos += gtk_elem_len;
wpa_printf(MSG_DEBUG, "Pass 4, gtk_len = %d",
(int) gtk_elem_len);
#ifdef CONFIG_IEEE80211W
res = wpa_wnmsleep_igtk_subelem(sta->wpa_sm, pos);
if (res < 0) {
os_free(wnmtfs_ie);
os_free(mgmt);
return -1;
}
igtk_elem_len = res;
pos += igtk_elem_len;
wpa_printf(MSG_DEBUG, "Pass 4 igtk_len = %d",
(int) igtk_elem_len);
#endif /* CONFIG_IEEE80211W */
WPA_PUT_LE16((u8 *)
&mgmt->u.action.u.wnm_sleep_resp.keydata_len,
gtk_elem_len + igtk_elem_len);
}
os_memcpy(pos, &wnmsleep_ie, wnmsleep_ie_len);
/* copy TFS IE here */
pos += wnmsleep_ie_len;
os_memcpy(pos, wnmtfs_ie, wnmtfs_ie_len);
len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_resp) + gtk_elem_len +
igtk_elem_len + wnmsleep_ie_len + wnmtfs_ie_len;
/* In driver, response frame should be forced to sent when STA is in
* PS mode */
res = hostapd_drv_send_action(hapd, hapd->iface->freq, 0,
mgmt->da, &mgmt->u.action.category, len);
if (!res) {
wpa_printf(MSG_DEBUG, "Successfully send WNM-Sleep Response "
"frame");
/* when entering wnmsleep
* 1. pause the node in driver
* 2. mark the node so that AP won't update GTK/IGTK during
* WNM Sleep
*/
if (wnmsleep_ie.status == WNM_STATUS_SLEEP_ACCEPT &&
wnmsleep_ie.action_type == 0) {
hostapd_drv_wnm_oper(hapd, WNM_SLEEP_ENTER_CONFIRM,
addr, NULL, NULL);
wpa_set_wnmsleep(sta->wpa_sm, 1);
}
/* when exiting wnmsleep
* 1. unmark the node
* 2. start GTK/IGTK update if MFP is not used
* 3. unpause the node in driver
*/
if (wnmsleep_ie.status == WNM_STATUS_SLEEP_ACCEPT &&
wnmsleep_ie.action_type == 1) {
wpa_set_wnmsleep(sta->wpa_sm, 0);
hostapd_drv_wnm_oper(hapd, WNM_SLEEP_EXIT_CONFIRM,
addr, NULL, NULL);
if (wpa_auth_uses_mfp(sta->wpa_sm) && action_type == 1)
wpa_wnmsleep_rekey_gtk(sta->wpa_sm);
}
} else
wpa_printf(MSG_DEBUG, "Fail to send WNM-Sleep Response frame");
#undef MAX_GTK_SUBELEM_LEN
#undef MAX_IGTK_SUBELEM_LEN
os_free(wnmtfs_ie);
os_free(mgmt);
return res;
}
static void ieee802_11_rx_wnmsleep_req(struct hostapd_data *hapd,
const u8 *addr, const u8 *frm, int len)
{
/*
* Action [1] | Dialog Token [1] | WNM-Sleep Mode IE |
* TFS Response IE
*/
u8 *pos = (u8 *) frm; /* point to action field */
u8 dialog_token = pos[1];
struct wnm_sleep_element *wnmsleep_ie = NULL;
/* multiple TFS Req IE (assuming consecutive) */
u8 *tfsreq_ie_start = NULL;
u8 *tfsreq_ie_end = NULL;
u16 tfsreq_ie_len = 0;
pos += 1 + 1;
while (pos - frm < len - 1) {
u8 ie_len = *(pos+1);
if (*pos == WLAN_EID_WNMSLEEP)
wnmsleep_ie = (struct wnm_sleep_element *)pos;
else if (*pos == WLAN_EID_TFS_REQ) {
if (!tfsreq_ie_start)
tfsreq_ie_start = pos;
tfsreq_ie_end = pos;
} else
wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
pos += ie_len + 2;
}
if (!wnmsleep_ie) {
wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
return;
}
if (wnmsleep_ie->action_type == 0 && tfsreq_ie_start &&
tfsreq_ie_end && tfsreq_ie_end - tfsreq_ie_start >= 0) {
tfsreq_ie_len = (tfsreq_ie_end + tfsreq_ie_end[1] + 2) -
tfsreq_ie_start;
wpa_printf(MSG_DEBUG, "TFS Req IE(s) found");
/* pass the TFS Req IE(s) to driver for processing */
if (ieee80211_11_set_tfs_ie(hapd, addr, tfsreq_ie_start,
&tfsreq_ie_len,
WNM_SLEEP_TFS_REQ_IE_SET))
wpa_printf(MSG_DEBUG, "Fail to set TFS Req IE");
}
ieee802_11_send_wnmsleep_resp(hapd, addr, dialog_token,
wnmsleep_ie->action_type,
wnmsleep_ie->intval);
if (wnmsleep_ie->action_type == 1) {
/* clear the tfs after sending the resp frame */
ieee80211_11_set_tfs_ie(hapd, addr, tfsreq_ie_start,
&tfsreq_ie_len, WNM_SLEEP_TFS_IE_DEL);
}
}
void ieee802_11_rx_wnm_action_ap(struct hostapd_data *hapd,
struct rx_action *action)
{
u8 *pos = (u8 *) action->data + 1; /* point to the action field */
u8 act = *pos;
switch (act) {
case WNM_SLEEP_MODE_REQ:
ieee802_11_rx_wnmsleep_req(hapd, action->sa, action->data + 1,
action->len);
break;
default:
break;
}
}
#endif /* CONFIG_IEEE80211V */

17
src/ap/wnm_ap.h Normal file
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@ -0,0 +1,17 @@
/*
* IEEE 802.11v WNM related functions and structures
* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#ifndef WNM_AP_H
#define WNM_AP_H
struct rx_action;
void ieee802_11_rx_wnm_action_ap(struct hostapd_data *hapd,
struct rx_action *action);
#endif /* WNM_AP_H */

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@ -2461,6 +2461,12 @@ static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
"marking station for GTK rekeying"); "marking station for GTK rekeying");
} }
#ifdef CONFIG_IEEE80211V
/* Do not rekey GTK/IGTK when STA is in wnmsleep */
if (sm->is_wnmsleep)
return 0;
#endif /* CONFIG_IEEE80211V */
sm->group->GKeyDoneStations++; sm->group->GKeyDoneStations++;
sm->GUpdateStationKeys = TRUE; sm->GUpdateStationKeys = TRUE;
@ -2469,6 +2475,132 @@ static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
} }
#ifdef CONFIG_IEEE80211V
/* update GTK when exiting wnmsleep mode */
void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
{
if (sm->is_wnmsleep)
return;
wpa_group_update_sta(sm, NULL);
}
void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
{
sm->is_wnmsleep = !!flag;
}
int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
{
u8 *subelem;
struct wpa_group *gsm = sm->group;
size_t subelem_len, pad_len;
const u8 *key;
size_t key_len;
u8 keybuf[32];
/* GTK subslement */
key_len = gsm->GTK_len;
if (key_len > sizeof(keybuf))
return 0;
/*
* Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
* than 16 bytes.
*/
pad_len = key_len % 8;
if (pad_len)
pad_len = 8 - pad_len;
if (key_len + pad_len < 16)
pad_len += 8;
if (pad_len) {
os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
os_memset(keybuf + key_len, 0, pad_len);
keybuf[key_len] = 0xdd;
key_len += pad_len;
key = keybuf;
} else
key = gsm->GTK[gsm->GN - 1];
/*
* Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
* Key[5..32] | 8 padding.
*/
subelem_len = 13 + key_len + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return 0;
subelem[0] = WNM_SLEEP_SUBELEM_GTK;
subelem[1] = 11 + key_len + 8;
/* Key ID in B0-B1 of Key Info */
WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
subelem[4] = gsm->GTK_len;
if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5) != 0)
{
os_free(subelem);
return 0;
}
if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
os_free(subelem);
return 0;
}
os_memcpy(pos, subelem, subelem_len);
wpa_hexdump_key(MSG_DEBUG, "Plaintext GTK",
gsm->GTK[gsm->GN - 1], gsm->GTK_len);
os_free(subelem);
return subelem_len;
}
#ifdef CONFIG_IEEE80211W
int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
{
u8 *subelem, *ptr;
struct wpa_group *gsm = sm->group;
size_t subelem_len;
/* IGTK subelement
* Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] |
* Key[16] | 8 padding */
subelem_len = 1 + 1 + 2 + 6 + WPA_IGTK_LEN + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return 0;
ptr = subelem;
*ptr++ = WNM_SLEEP_SUBELEM_IGTK;
*ptr++ = subelem_len - 2;
WPA_PUT_LE16(ptr, gsm->GN_igtk);
ptr += 2;
if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, ptr) != 0) {
os_free(subelem);
return 0;
}
ptr += 6;
if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
gsm->IGTK[gsm->GN_igtk - 4], ptr)) {
os_free(subelem);
return -1;
}
os_memcpy(pos, subelem, subelem_len);
wpa_hexdump_key(MSG_DEBUG, "Plaintext IGTK",
gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
os_free(subelem);
return subelem_len;
}
#endif /* CONFIG_IEEE80211W */
#endif /* CONFIG_IEEE80211V */
static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
struct wpa_group *group) struct wpa_group *group)
{ {

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@ -282,4 +282,13 @@ int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr); void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr);
#endif /* CONFIG_IEEE80211R */ #endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211V
void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm);
void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag);
int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos);
#ifdef CONFIG_IEEE80211W
int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos);
#endif /* CONFIG_IEEE80211W */
#endif /* CONFIG_IEEE80211V */
#endif /* WPA_AUTH_H */ #endif /* WPA_AUTH_H */

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@ -87,6 +87,9 @@ struct wpa_state_machine {
unsigned int ft_completed:1; unsigned int ft_completed:1;
unsigned int pmk_r1_name_valid:1; unsigned int pmk_r1_name_valid:1;
#endif /* CONFIG_IEEE80211R */ #endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211V
unsigned int is_wnmsleep:1;
#endif /* CONFIG_IEEE80211V */
u8 req_replay_counter[WPA_REPLAY_COUNTER_LEN]; u8 req_replay_counter[WPA_REPLAY_COUNTER_LEN];
int req_replay_counter_used; int req_replay_counter_used;