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hostapd/wpa_supplicant/wnm_sta.c
Jouni Malinen 75d65857d5 WNM: Use recent scan results on BSS transition request 
If the last scans are recent (for now, less than ten seconds old), use
them instead of triggering a new scan when a BSS Transition Management
Request frame is received. As a fallback, allow a new scan to be
triggered if no matches were found.

Signed-off-by: Jouni Malinen <j@w1.fi>
2014-11-22 20:17:47 +02:00

1131 lines
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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, u8 *buf, u16 *buf_len,
enum wnm_oper oper)
{
wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, 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,
u8 *tfsresp_ie_start,
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 (ptr + 1 < end) {
if (ptr + 2 + ptr[1] > end) {
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
*/
u8 *pos = (u8 *) 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) */
u8 *tfsresp_ie_start = NULL;
u8 *tfsresp_ie_end = NULL;
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);
pos += 3 + key_len_total;
if (pos > frm + len) {
wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
return;
}
while (pos - frm < len) {
u8 ie_len = *(pos + 1);
if (pos + 2 + ie_len > frm + len) {
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)
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)
{
return ieee80211_chan_to_freq(NULL, 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;
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;
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);
}
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 (pos + 5 > end)
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 (pos + 12 > end) {
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 (pos + 1 > end || pos + 1 + pos[0] > end) {
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_zalloc(
WNM_MAX_NEIGHBOR_REPORT *
sizeof(struct neighbor_report));
if (wpa_s->wnm_neighbor_report_elements == NULL)
return;
while (pos + 2 <= end &&
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 (pos + len > end) {
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 (pos + 1 < end) {
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 (pos + url_len + 1 > ie_end) {
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 (pos + url_len > ie_end)
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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