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hostapd/wpa_supplicant/wnm_sta.c
Jouni Malinen 8acbe7f2a4 WNM: Verify WNM Sleep Mode element length 
This element is required to have at least four octets of actual payload.
This was not previously verified before use and the extra buffer data
after the IE might have been used instead if a received WNM-Sleep Mode
Response frame was invalid.

Signed-off-by: Jouni Malinen <j@w1.fi>
2015-10-25 19:37:17 +02:00

1150 lines
30 KiB
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/*
* wpa_supplicant - WNM
* Copyright (c) 2011-2013, 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 "common/ieee802_11_common.h"
#include "common/wpa_ctrl.h"
#include "rsn_supp/wpa.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "scan.h"
#include "ctrl_iface.h"
#include "bss.h"
#include "wnm_sta.h"
#include "hs20_supplicant.h"
#define MAX_TFS_IE_LEN 1024
#define WNM_MAX_NEIGHBOR_REPORT 10
/* get the TFS IE from driver */
static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
u16 *buf_len, enum wnm_oper oper)
{
wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
}
/* set the TFS IE to driver */
static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
const u8 *addr, const u8 *buf, u16 buf_len,
enum wnm_oper oper)
{
u16 len = buf_len;
wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
return wpa_drv_wnm_oper(wpa_s, oper, addr, (u8 *) buf, &len);
}
/* MLME-SLEEPMODE.request */
int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
u8 action, u16 intval, struct wpabuf *tfs_req)
{
struct ieee80211_mgmt *mgmt;
int res;
size_t len;
struct wnm_sleep_element *wnmsleep_ie;
u8 *wnmtfs_ie;
u8 wnmsleep_ie_len;
u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
WNM_SLEEP_TFS_REQ_IE_NONE;
wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
"action=%s to " MACSTR,
action == 0 ? "enter" : "exit",
MAC2STR(wpa_s->bssid));
/* WNM-Sleep Mode IE */
wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
if (wnmsleep_ie == NULL)
return -1;
wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
wnmsleep_ie->len = wnmsleep_ie_len - 2;
wnmsleep_ie->action_type = action;
wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
wnmsleep_ie->intval = host_to_le16(intval);
wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
(u8 *) wnmsleep_ie, wnmsleep_ie_len);
/* TFS IE(s) */
if (tfs_req) {
wnmtfs_ie_len = wpabuf_len(tfs_req);
wnmtfs_ie = os_malloc(wnmtfs_ie_len);
if (wnmtfs_ie == NULL) {
os_free(wnmsleep_ie);
return -1;
}
os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
} else {
wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
if (wnmtfs_ie == NULL) {
os_free(wnmsleep_ie);
return -1;
}
if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
tfs_oper)) {
wnmtfs_ie_len = 0;
os_free(wnmtfs_ie);
wnmtfs_ie = NULL;
}
}
wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
(u8 *) wnmtfs_ie, wnmtfs_ie_len);
mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
if (mgmt == NULL) {
wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
"WNM-Sleep Request action frame");
os_free(wnmsleep_ie);
os_free(wnmtfs_ie);
return -1;
}
os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
os_memcpy(mgmt->bssid, wpa_s->bssid, 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_req.action = WNM_SLEEP_MODE_REQ;
mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
wnmsleep_ie_len);
/* copy TFS IE here */
if (wnmtfs_ie_len > 0) {
os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
}
len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
wnmtfs_ie_len;
res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
&mgmt->u.action.category, len, 0);
if (res < 0)
wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
"(action=%d, intval=%d)", action, intval);
os_free(wnmsleep_ie);
os_free(wnmtfs_ie);
os_free(mgmt);
return res;
}
static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
const u8 *tfsresp_ie_start,
const u8 *tfsresp_ie_end)
{
wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
wpa_s->bssid, NULL, NULL);
/* remove GTK/IGTK ?? */
/* set the TFS Resp IE(s) */
if (tfsresp_ie_start && tfsresp_ie_end &&
tfsresp_ie_end - tfsresp_ie_start >= 0) {
u16 tfsresp_ie_len;
tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
tfsresp_ie_start;
wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
/* pass the TFS Resp IE(s) to driver for processing */
if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
tfsresp_ie_start,
tfsresp_ie_len,
WNM_SLEEP_TFS_RESP_IE_SET))
wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
}
}
static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
const u8 *frm, u16 key_len_total)
{
u8 *ptr, *end;
u8 gtk_len;
wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
NULL, NULL);
/* Install GTK/IGTK */
/* point to key data field */
ptr = (u8 *) frm + 1 + 2;
end = ptr + key_len_total;
wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
while (end - ptr > 1) {
if (2 + ptr[1] > end - ptr) {
wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
"length");
if (end > ptr) {
wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
ptr, end - ptr);
}
break;
}
if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
if (ptr[1] < 11 + 5) {
wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
"subelem");
break;
}
gtk_len = *(ptr + 4);
if (ptr[1] < 11 + gtk_len ||
gtk_len < 5 || gtk_len > 32) {
wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
"subelem");
break;
}
wpa_wnmsleep_install_key(
wpa_s->wpa,
WNM_SLEEP_SUBELEM_GTK,
ptr);
ptr += 13 + gtk_len;
#ifdef CONFIG_IEEE80211W
} else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
"subelem");
break;
}
wpa_wnmsleep_install_key(wpa_s->wpa,
WNM_SLEEP_SUBELEM_IGTK, ptr);
ptr += 10 + WPA_IGTK_LEN;
#endif /* CONFIG_IEEE80211W */
} else
break; /* skip the loop */
}
}
static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
const u8 *frm, int len)
{
/*
* Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
* WNM-Sleep Mode IE | TFS Response IE
*/
const u8 *pos = frm; /* point to payload after the action field */
u16 key_len_total;
struct wnm_sleep_element *wnmsleep_ie = NULL;
/* multiple TFS Resp IE (assuming consecutive) */
const u8 *tfsresp_ie_start = NULL;
const u8 *tfsresp_ie_end = NULL;
size_t left;
if (len < 3)
return;
key_len_total = WPA_GET_LE16(frm + 1);
wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
frm[0], key_len_total);
left = len - 3;
if (key_len_total > left) {
wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
return;
}
pos += 3 + key_len_total;
while (pos - frm + 1 < len) {
u8 ie_len = *(pos + 1);
if (2 + ie_len > frm + len - pos) {
wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
break;
}
wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
if (*pos == WLAN_EID_WNMSLEEP && ie_len >= 4)
wnmsleep_ie = (struct wnm_sleep_element *) pos;
else if (*pos == WLAN_EID_TFS_RESP) {
if (!tfsresp_ie_start)
tfsresp_ie_start = pos;
tfsresp_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->status == WNM_STATUS_SLEEP_ACCEPT ||
wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
"frame (action=%d, intval=%d)",
wnmsleep_ie->action_type, wnmsleep_ie->intval);
if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
tfsresp_ie_end);
} else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
}
} else {
wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
"(action=%d, intval=%d)",
wnmsleep_ie->action_type, wnmsleep_ie->intval);
if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
wpa_s->bssid, NULL, NULL);
else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
wpa_s->bssid, NULL, NULL);
}
}
void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
{
int i;
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
}
wpa_s->wnm_num_neighbor_report = 0;
os_free(wpa_s->wnm_neighbor_report_elements);
wpa_s->wnm_neighbor_report_elements = NULL;
}
static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
u8 id, u8 elen, const u8 *pos)
{
switch (id) {
case WNM_NEIGHBOR_TSF:
if (elen < 2 + 2) {
wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
break;
}
rep->tsf_offset = WPA_GET_LE16(pos);
rep->beacon_int = WPA_GET_LE16(pos + 2);
rep->tsf_present = 1;
break;
case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
if (elen < 2) {
wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
"country string");
break;
}
os_memcpy(rep->country, pos, 2);
rep->country_present = 1;
break;
case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
if (elen < 1) {
wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
"candidate");
break;
}
rep->preference = pos[0];
rep->preference_present = 1;
break;
case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
rep->bss_term_tsf = WPA_GET_LE64(pos);
rep->bss_term_dur = WPA_GET_LE16(pos + 8);
rep->bss_term_present = 1;
break;
case WNM_NEIGHBOR_BEARING:
if (elen < 8) {
wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
"bearing");
break;
}
rep->bearing = WPA_GET_LE16(pos);
rep->distance = WPA_GET_LE32(pos + 2);
rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
rep->bearing_present = 1;
break;
case WNM_NEIGHBOR_MEASUREMENT_PILOT:
if (elen < 1) {
wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
"pilot");
break;
}
os_free(rep->meas_pilot);
rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
if (rep->meas_pilot == NULL)
break;
rep->meas_pilot->measurement_pilot = pos[0];
rep->meas_pilot->subelem_len = elen - 1;
os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
break;
case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
if (elen < 5) {
wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
"capabilities");
break;
}
os_memcpy(rep->rm_capab, pos, 5);
rep->rm_capab_present = 1;
break;
case WNM_NEIGHBOR_MULTIPLE_BSSID:
if (elen < 1) {
wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
break;
}
os_free(rep->mul_bssid);
rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
if (rep->mul_bssid == NULL)
break;
rep->mul_bssid->max_bssid_indicator = pos[0];
rep->mul_bssid->subelem_len = elen - 1;
os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
break;
}
}
static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
{
struct wpa_bss *bss = wpa_s->current_bss;
const char *country = NULL;
if (bss) {
const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
if (elem && elem[1] >= 2)
country = (const char *) (elem + 2);
}
return ieee80211_chan_to_freq(country, op_class, chan);
}
static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
const u8 *pos, u8 len,
struct neighbor_report *rep)
{
u8 left = len;
if (left < 13) {
wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
return;
}
os_memcpy(rep->bssid, pos, ETH_ALEN);
rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
rep->regulatory_class = *(pos + 10);
rep->channel_number = *(pos + 11);
rep->phy_type = *(pos + 12);
pos += 13;
left -= 13;
while (left >= 2) {
u8 id, elen;
id = *pos++;
elen = *pos++;
wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
left -= 2;
if (elen > left) {
wpa_printf(MSG_DEBUG,
"WNM: Truncated neighbor report subelement");
break;
}
wnm_parse_neighbor_report_elem(rep, id, elen, pos);
left -= elen;
pos += elen;
}
rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class,
rep->channel_number);
}
static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
{
u8 i;
struct wpa_bss *bss = wpa_s->current_bss;
struct wpa_bss *target;
if (!bss)
return 0;
wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
MAC2STR(wpa_s->bssid), bss->level);
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
if (nei->preference_present && nei->preference == 0) {
wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
MAC2STR(nei->bssid));
continue;
}
target = wpa_bss_get_bssid(wpa_s, nei->bssid);
if (!target) {
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) not found in scan results",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1);
continue;
}
if (bss->ssid_len != target->ssid_len ||
os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
/*
* TODO: Could consider allowing transition to another
* ESS if PMF was enabled for the association.
*/
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) in different ESS",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1);
continue;
}
if (target->level < bss->level && target->level < -80) {
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) does not have sufficient signal level (%d)",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1,
target->level);
continue;
}
wpa_printf(MSG_DEBUG,
"WNM: Found an acceptable preferred transition candidate BSS "
MACSTR " (RSSI %d)",
MAC2STR(nei->bssid), target->level);
return target;
}
return NULL;
}
static void wnm_send_bss_transition_mgmt_resp(
struct wpa_supplicant *wpa_s, u8 dialog_token,
enum bss_trans_mgmt_status_code status, u8 delay,
const u8 *target_bssid)
{
u8 buf[1000], *pos;
struct ieee80211_mgmt *mgmt;
size_t len;
int res;
wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
"to " MACSTR " dialog_token=%u status=%u delay=%d",
MAC2STR(wpa_s->bssid), dialog_token, status, delay);
if (!wpa_s->current_bss) {
wpa_printf(MSG_DEBUG,
"WNM: Current BSS not known - drop response");
return;
}
mgmt = (struct ieee80211_mgmt *) buf;
os_memset(&buf, 0, sizeof(buf));
os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
os_memcpy(mgmt->bssid, wpa_s->bssid, 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.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
mgmt->u.action.u.bss_tm_resp.status_code = status;
mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
pos = mgmt->u.action.u.bss_tm_resp.variable;
if (target_bssid) {
os_memcpy(pos, target_bssid, ETH_ALEN);
pos += ETH_ALEN;
} else if (status == WNM_BSS_TM_ACCEPT) {
/*
* P802.11-REVmc clarifies that the Target BSSID field is always
* present when status code is zero, so use a fake value here if
* no BSSID is yet known.
*/
os_memset(pos, 0, ETH_ALEN);
pos += ETH_ALEN;
}
len = pos - (u8 *) &mgmt->u.action.category;
res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
&mgmt->u.action.category, len, 0);
if (res < 0) {
wpa_printf(MSG_DEBUG,
"WNM: Failed to send BSS Transition Management Response");
}
}
int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
{
struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid;
enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
if (!wpa_s->wnm_neighbor_report_elements)
return 0;
if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
&wpa_s->scan_trigger_time)) {
wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
wnm_deallocate_memory(wpa_s);
return 0;
}
if (!wpa_s->current_bss ||
os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid,
ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it");
return 0;
}
/* Compare the Neighbor Report and scan results */
bss = compare_scan_neighbor_results(wpa_s);
if (!bss) {
wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
goto send_bss_resp_fail;
}
/* Associate to the network */
/* Send the BSS Management Response - Accept */
if (wpa_s->wnm_reply) {
wpa_s->wnm_reply = 0;
wnm_send_bss_transition_mgmt_resp(wpa_s,
wpa_s->wnm_dialog_token,
WNM_BSS_TM_ACCEPT,
0, bss->bssid);
}
if (bss == wpa_s->current_bss) {
wpa_printf(MSG_DEBUG,
"WNM: Already associated with the preferred candidate");
return 1;
}
wpa_s->reassociate = 1;
wpa_supplicant_connect(wpa_s, bss, ssid);
wnm_deallocate_memory(wpa_s);
return 1;
send_bss_resp_fail:
if (!reply_on_fail)
return 0;
/* Send reject response for all the failures */
if (wpa_s->wnm_reply) {
wpa_s->wnm_reply = 0;
wnm_send_bss_transition_mgmt_resp(wpa_s,
wpa_s->wnm_dialog_token,
status, 0, NULL);
}
wnm_deallocate_memory(wpa_s);
return 0;
}
static int cand_pref_compar(const void *a, const void *b)
{
const struct neighbor_report *aa = a;
const struct neighbor_report *bb = b;
if (!aa->preference_present && !bb->preference_present)
return 0;
if (!aa->preference_present)
return 1;
if (!bb->preference_present)
return -1;
if (bb->preference > aa->preference)
return 1;
if (bb->preference < aa->preference)
return -1;
return 0;
}
static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s)
{
if (!wpa_s->wnm_neighbor_report_elements)
return;
qsort(wpa_s->wnm_neighbor_report_elements,
wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report),
cand_pref_compar);
}
static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
{
unsigned int i;
wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
if (!wpa_s->wnm_neighbor_report_elements)
return;
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
wpa_printf(MSG_DEBUG, "%u: " MACSTR
" info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d",
i, MAC2STR(nei->bssid), nei->bssid_info,
nei->regulatory_class,
nei->channel_number, nei->phy_type,
nei->preference_present ? nei->preference : -1,
nei->freq);
}
}
static int chan_supported(struct wpa_supplicant *wpa_s, int freq)
{
unsigned int i;
for (i = 0; i < wpa_s->hw.num_modes; i++) {
struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i];
int j;
for (j = 0; j < mode->num_channels; j++) {
struct hostapd_channel_data *chan;
chan = &mode->channels[j];
if (chan->freq == freq &&
!(chan->flag & HOSTAPD_CHAN_DISABLED))
return 1;
}
}
return 0;
}
static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
{
int *freqs;
int num_freqs = 0;
unsigned int i;
if (!wpa_s->wnm_neighbor_report_elements)
return;
if (wpa_s->hw.modes == NULL)
return;
os_free(wpa_s->next_scan_freqs);
wpa_s->next_scan_freqs = NULL;
freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int));
if (freqs == NULL)
return;
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
if (nei->freq <= 0) {
wpa_printf(MSG_DEBUG,
"WNM: Unknown neighbor operating frequency for "
MACSTR " - scan all channels",
MAC2STR(nei->bssid));
os_free(freqs);
return;
}
if (chan_supported(wpa_s, nei->freq))
add_freq(freqs, &num_freqs, nei->freq);
}
if (num_freqs == 0) {
os_free(freqs);
return;
}
wpa_printf(MSG_DEBUG,
"WNM: Scan %d frequencies based on transition candidate list",
num_freqs);
wpa_s->next_scan_freqs = freqs;
}
static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
const u8 *pos, const u8 *end,
int reply)
{
unsigned int beacon_int;
u8 valid_int;
if (end - pos < 5)
return;
if (wpa_s->current_bss)
beacon_int = wpa_s->current_bss->beacon_int;
else
beacon_int = 100; /* best guess */
wpa_s->wnm_dialog_token = pos[0];
wpa_s->wnm_mode = pos[1];
wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
valid_int = pos[4];
wpa_s->wnm_reply = reply;
wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
"dialog_token=%u request_mode=0x%x "
"disassoc_timer=%u validity_interval=%u",
wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
wpa_s->wnm_dissoc_timer, valid_int);
pos += 5;
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
if (end - pos < 12) {
wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
return;
}
os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
pos += 12; /* BSS Termination Duration */
}
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
char url[256];
if (end - pos < 1 || 1 + pos[0] > end - pos) {
wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
"Management Request (URL)");
return;
}
os_memcpy(url, pos + 1, pos[0]);
url[pos[0]] = '\0';
pos += 1 + pos[0];
wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
wpa_sm_pmf_enabled(wpa_s->wpa),
wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
}
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
"Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
/* TODO: mark current BSS less preferred for
* selection */
wpa_printf(MSG_DEBUG, "Trying to find another BSS");
wpa_supplicant_req_scan(wpa_s, 0, 0);
}
}
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
unsigned int valid_ms;
wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
wnm_deallocate_memory(wpa_s);
wpa_s->wnm_neighbor_report_elements = os_calloc(
WNM_MAX_NEIGHBOR_REPORT,
sizeof(struct neighbor_report));
if (wpa_s->wnm_neighbor_report_elements == NULL)
return;
while (end - pos >= 2 &&
wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
{
u8 tag = *pos++;
u8 len = *pos++;
wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
tag);
if (len > end - pos) {
wpa_printf(MSG_DEBUG, "WNM: Truncated request");
return;
}
if (tag == WLAN_EID_NEIGHBOR_REPORT) {
struct neighbor_report *rep;
rep = &wpa_s->wnm_neighbor_report_elements[
wpa_s->wnm_num_neighbor_report];
wnm_parse_neighbor_report(wpa_s, pos, len, rep);
}
pos += len;
wpa_s->wnm_num_neighbor_report++;
}
wnm_sort_cand_list(wpa_s);
wnm_dump_cand_list(wpa_s);
valid_ms = valid_int * beacon_int * 128 / 125;
wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
valid_ms);
os_get_reltime(&wpa_s->wnm_cand_valid_until);
wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
wpa_s->wnm_cand_valid_until.sec +=
wpa_s->wnm_cand_valid_until.usec / 1000000;
wpa_s->wnm_cand_valid_until.usec %= 1000000;
os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
if (wpa_s->last_scan_res_used > 0) {
struct os_reltime now;
os_get_reltime(&now);
if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) {
wpa_printf(MSG_DEBUG,
"WNM: Try to use recent scan results");
if (wnm_scan_process(wpa_s, 0) > 0)
return;
wpa_printf(MSG_DEBUG,
"WNM: No match in previous scan results - try a new scan");
}
}
wnm_set_scan_freqs(wpa_s);
wpa_supplicant_req_scan(wpa_s, 0, 0);
} else if (reply) {
enum bss_trans_mgmt_status_code status;
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
status = WNM_BSS_TM_ACCEPT;
else {
wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
status = WNM_BSS_TM_REJECT_UNSPECIFIED;
}
wnm_send_bss_transition_mgmt_resp(wpa_s,
wpa_s->wnm_dialog_token,
status, 0, NULL);
}
}
int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
u8 query_reason)
{
u8 buf[1000], *pos;
struct ieee80211_mgmt *mgmt;
size_t len;
int ret;
wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
MACSTR " query_reason=%u",
MAC2STR(wpa_s->bssid), query_reason);
mgmt = (struct ieee80211_mgmt *) buf;
os_memset(&buf, 0, sizeof(buf));
os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
os_memcpy(mgmt->bssid, wpa_s->bssid, 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.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
mgmt->u.action.u.bss_tm_query.dialog_token = 1;
mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
pos = mgmt->u.action.u.bss_tm_query.variable;
len = pos - (u8 *) &mgmt->u.action.category;
ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
&mgmt->u.action.category, len, 0);
return ret;
}
static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
const u8 *sa, const u8 *data,
int len)
{
const u8 *pos, *end, *next;
u8 ie, ie_len;
pos = data;
end = data + len;
while (end - pos > 1) {
ie = *pos++;
ie_len = *pos++;
wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
ie, ie_len);
if (ie_len > end - pos) {
wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
"subelement");
break;
}
next = pos + ie_len;
if (ie_len < 4) {
pos = next;
continue;
}
wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
WPA_GET_BE24(pos), pos[3]);
#ifdef CONFIG_HS20
if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
WPA_GET_BE24(pos) == OUI_WFA &&
pos[3] == HS20_WNM_SUB_REM_NEEDED) {
/* Subscription Remediation subelement */
const u8 *ie_end;
u8 url_len;
char *url;
u8 osu_method;
wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
"subelement");
ie_end = pos + ie_len;
pos += 4;
url_len = *pos++;
if (url_len == 0) {
wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
url = NULL;
osu_method = 1;
} else {
if (url_len + 1 > ie_end - pos) {
wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
url_len,
(int) (ie_end - pos));
break;
}
url = os_malloc(url_len + 1);
if (url == NULL)
break;
os_memcpy(url, pos, url_len);
url[url_len] = '\0';
osu_method = pos[url_len];
}
hs20_rx_subscription_remediation(wpa_s, url,
osu_method);
os_free(url);
pos = next;
continue;
}
if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
WPA_GET_BE24(pos) == OUI_WFA &&
pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
const u8 *ie_end;
u8 url_len;
char *url;
u8 code;
u16 reauth_delay;
ie_end = pos + ie_len;
pos += 4;
code = *pos++;
reauth_delay = WPA_GET_LE16(pos);
pos += 2;
url_len = *pos++;
wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
"Imminent - Reason Code %u "
"Re-Auth Delay %u URL Length %u",
code, reauth_delay, url_len);
if (url_len > ie_end - pos)
break;
url = os_malloc(url_len + 1);
if (url == NULL)
break;
os_memcpy(url, pos, url_len);
url[url_len] = '\0';
hs20_rx_deauth_imminent_notice(wpa_s, code,
reauth_delay, url);
os_free(url);
pos = next;
continue;
}
#endif /* CONFIG_HS20 */
pos = next;
}
}
static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
const u8 *sa, const u8 *frm, int len)
{
const u8 *pos, *end;
u8 dialog_token, type;
/* Dialog Token [1] | Type [1] | Subelements */
if (len < 2 || sa == NULL)
return;
end = frm + len;
pos = frm;
dialog_token = *pos++;
type = *pos++;
wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
"(dialog_token %u type %u sa " MACSTR ")",
dialog_token, type, MAC2STR(sa));
wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
pos, end - pos);
if (wpa_s->wpa_state != WPA_COMPLETED ||
os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
"from our AP - ignore it");
return;
}
switch (type) {
case 1:
ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
break;
default:
wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
"WNM-Notification type %u", type);
break;
}
}
void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
const struct ieee80211_mgmt *mgmt, size_t len)
{
const u8 *pos, *end;
u8 act;
if (len < IEEE80211_HDRLEN + 2)
return;
pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
act = *pos++;
end = ((const u8 *) mgmt) + len;
wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
act, MAC2STR(mgmt->sa));
if (wpa_s->wpa_state < WPA_ASSOCIATED ||
os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
"frame");
return;
}
switch (act) {
case WNM_BSS_TRANS_MGMT_REQ:
ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
!(mgmt->da[0] & 0x01));
break;
case WNM_SLEEP_MODE_RESP:
ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
break;
case WNM_NOTIFICATION_REQ:
ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
break;
default:
wpa_printf(MSG_ERROR, "WNM: Unknown request");
break;
}
}
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