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hostapd/wpa_supplicant/wnm_sta.c
Benjamin Berg d9d8627873 WNM: Consolidate the scanning paths for BTM requests 
There was an ancient code path to trigger a scan that was apparently
forgotten when the code was extended over time. It does not make any
sense to trigger a scan twice, so remove the earlier scan.

The earlier scan call was avoiding to trigger a new scan if a fixed
BSSID is configured. This seems like a reasonable restriction to do, so
add this check before starting a scan.

Consolidate everything so that scanning happens at the end of the
functions unless we bail out before. Add a "reset" label for all other
cases to ensure that we don't leave things in the a bad state.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
2024-08-02 13:40:37 +03:00

2118 lines
55 KiB
C
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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 "common/ocv.h"
#include "rsn_supp/wpa.h"
#include "config.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 "notify.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, *oci_ie;
u8 wnmsleep_ie_len, oci_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_memdup(wpabuf_head(tfs_req), wnmtfs_ie_len);
if (wnmtfs_ie == NULL) {
os_free(wnmsleep_ie);
return -1;
}
} 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);
oci_ie = NULL;
oci_ie_len = 0;
#ifdef CONFIG_OCV
if (action == WNM_SLEEP_MODE_EXIT && wpa_sm_ocv_enabled(wpa_s->wpa)) {
struct wpa_channel_info ci;
if (wpa_drv_channel_info(wpa_s, &ci) != 0) {
wpa_printf(MSG_WARNING,
"Failed to get channel info for OCI element in WNM-Sleep Mode frame");
os_free(wnmsleep_ie);
os_free(wnmtfs_ie);
return -1;
}
#ifdef CONFIG_TESTING_OPTIONS
if (wpa_s->oci_freq_override_wnm_sleep) {
wpa_printf(MSG_INFO,
"TEST: Override OCI KDE frequency %d -> %d MHz",
ci.frequency,
wpa_s->oci_freq_override_wnm_sleep);
ci.frequency = wpa_s->oci_freq_override_wnm_sleep;
}
#endif /* CONFIG_TESTING_OPTIONS */
oci_ie_len = OCV_OCI_EXTENDED_LEN;
oci_ie = os_zalloc(oci_ie_len);
if (!oci_ie) {
wpa_printf(MSG_WARNING,
"Failed to allocate buffer for for OCI element in WNM-Sleep Mode frame");
os_free(wnmsleep_ie);
os_free(wnmtfs_ie);
return -1;
}
if (ocv_insert_extended_oci(&ci, oci_ie) < 0) {
os_free(wnmsleep_ie);
os_free(wnmtfs_ie);
os_free(oci_ie);
return -1;
}
}
#endif /* CONFIG_OCV */
mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len +
oci_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);
}
#ifdef CONFIG_OCV
/* copy OCV OCI here */
if (oci_ie_len > 0) {
os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
wnmsleep_ie_len + wnmtfs_ie_len, oci_ie, oci_ie_len);
}
#endif /* CONFIG_OCV */
len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
wnmtfs_ie_len + oci_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);
else
wpa_s->wnmsleep_used = 1;
os_free(wnmsleep_ie);
os_free(wnmtfs_ie);
os_free(oci_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);
if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) {
wpa_msg(wpa_s, MSG_INFO,
"WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled");
return;
}
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;
} 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;
} else if (*ptr == WNM_SLEEP_SUBELEM_BIGTK) {
if (ptr[1] < 2 + 6 + WPA_BIGTK_LEN) {
wpa_printf(MSG_DEBUG,
"WNM: Too short BIGTK subelem");
break;
}
wpa_wnmsleep_install_key(wpa_s->wpa,
WNM_SLEEP_SUBELEM_BIGTK, ptr);
ptr += 10 + WPA_BIGTK_LEN;
} 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;
#ifdef CONFIG_OCV
const u8 *oci_ie = NULL;
u8 oci_ie_len = 0;
#endif /* CONFIG_OCV */
size_t left;
if (!wpa_s->wnmsleep_used) {
wpa_printf(MSG_DEBUG,
"WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested");
return;
}
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;
#ifdef CONFIG_OCV
} else if (*pos == WLAN_EID_EXTENSION && ie_len >= 1 &&
pos[2] == WLAN_EID_EXT_OCV_OCI) {
oci_ie = pos + 3;
oci_ie_len = ie_len - 1;
#endif /* CONFIG_OCV */
} 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;
}
#ifdef CONFIG_OCV
if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT &&
wpa_sm_ocv_enabled(wpa_s->wpa)) {
struct wpa_channel_info ci;
if (wpa_drv_channel_info(wpa_s, &ci) != 0) {
wpa_msg(wpa_s, MSG_WARNING,
"Failed to get channel info to validate received OCI in WNM-Sleep Mode frame");
return;
}
if (ocv_verify_tx_params(oci_ie, oci_ie_len, &ci,
channel_width_to_int(ci.chanwidth),
ci.seg1_idx) != OCI_SUCCESS) {
wpa_msg(wpa_s, MSG_WARNING, "WNM: OCV failed: %s",
ocv_errorstr);
return;
}
}
#endif /* CONFIG_OCV */
wpa_s->wnmsleep_used = 0;
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_btm_reset(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;
wpa_s->wnm_cand_valid_until.sec = 0;
wpa_s->wnm_cand_valid_until.usec = 0;
wpa_s->wnm_mode = 0;
wpa_s->wnm_dialog_token = 0;
wpa_s->wnm_reply = 0;
#ifdef CONFIG_MBO
wpa_s->wnm_mbo_trans_reason_present = 0;
wpa_s->wnm_mbo_transition_reason = 0;
#endif /* CONFIG_MBO */
}
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:
if (elen < 10) {
wpa_printf(MSG_DEBUG,
"WNM: Too short BSS termination duration");
break;
}
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;
default:
wpa_printf(MSG_DEBUG,
"WNM: Unsupported neighbor report subelement id %u",
id);
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;
int freq;
if (bss) {
const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
if (elem && elem[1] >= 2)
country = (const char *) (elem + 2);
}
freq = ieee80211_chan_to_freq(country, op_class, chan);
if (freq <= 0 && op_class == 0) {
/*
* Some APs do not advertise correct operating class
* information. Try to determine the most likely operating
* frequency based on the channel number.
*/
if (chan >= 1 && chan <= 13)
freq = 2407 + chan * 5;
else if (chan == 14)
freq = 2484;
else if (chan >= 36 && chan <= 177)
freq = 5000 + chan * 5;
}
return freq;
}
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 void wnm_clear_acceptable(struct wpa_supplicant *wpa_s)
{
unsigned int i;
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++)
wpa_s->wnm_neighbor_report_elements[i].acceptable = 0;
}
#ifdef CONFIG_MBO
static struct wpa_bss *
get_mbo_transition_candidate(struct wpa_supplicant *wpa_s,
enum mbo_transition_reject_reason *reason)
{
struct wpa_bss *target = NULL;
struct wpa_bss_trans_info params;
struct wpa_bss_candidate_info *info = NULL;
struct neighbor_report *nei = wpa_s->wnm_neighbor_report_elements;
u8 *first_candidate_bssid = NULL, *pos;
unsigned int i;
params.mbo_transition_reason = wpa_s->wnm_mbo_transition_reason;
params.n_candidates = 0;
params.bssid = os_calloc(wpa_s->wnm_num_neighbor_report, ETH_ALEN);
if (!params.bssid)
return NULL;
pos = params.bssid;
for (i = 0; i < wpa_s->wnm_num_neighbor_report; nei++, i++) {
if (nei->is_first)
first_candidate_bssid = nei->bssid;
if (!nei->acceptable)
continue;
os_memcpy(pos, nei->bssid, ETH_ALEN);
pos += ETH_ALEN;
params.n_candidates++;
}
if (!params.n_candidates)
goto end;
info = wpa_drv_get_bss_trans_status(wpa_s, &params);
if (!info) {
/* If failed to get candidate BSS transition status from driver,
* get the first acceptable candidate from wpa_supplicant.
*/
target = wpa_bss_get_bssid(wpa_s, params.bssid);
goto end;
}
/* Get the first acceptable candidate from driver */
for (i = 0; i < info->num; i++) {
if (info->candidates[i].is_accept) {
target = wpa_bss_get_bssid(wpa_s,
info->candidates[i].bssid);
goto end;
}
}
/* If Disassociation Imminent is set and driver rejects all the
* candidate select first acceptable candidate which has
* rssi > disassoc_imminent_rssi_threshold
*/
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
for (i = 0; i < info->num; i++) {
target = wpa_bss_get_bssid(wpa_s,
info->candidates[i].bssid);
if (target &&
(target->level <
wpa_s->conf->disassoc_imminent_rssi_threshold))
continue;
goto end;
}
}
/* While sending BTM reject use reason code of the first candidate
* received in BTM request frame
*/
if (reason) {
for (i = 0; i < info->num; i++) {
if (first_candidate_bssid &&
ether_addr_equal(first_candidate_bssid,
info->candidates[i].bssid)) {
*reason = info->candidates[i].reject_reason;
break;
}
}
}
target = NULL;
end:
os_free(params.bssid);
if (info) {
os_free(info->candidates);
os_free(info);
}
return target;
}
#endif /* CONFIG_MBO */
static struct wpa_bss * find_better_target(struct wpa_bss *a,
struct wpa_bss *b)
{
if (!a)
return b;
if (!b)
return a;
if (a->est_throughput > b->est_throughput) {
wpa_printf(MSG_DEBUG, "WNM: A is better: " MACSTR
" est-tput: %d B: " MACSTR " est-tput: %d",
MAC2STR(a->bssid), a->est_throughput,
MAC2STR(b->bssid), b->est_throughput);
return a;
}
wpa_printf(MSG_DEBUG, "WNM: B is better, A: " MACSTR
" est-tput: %d B: " MACSTR " est-tput: %d",
MAC2STR(a->bssid), a->est_throughput,
MAC2STR(b->bssid), b->est_throughput);
return b;
}
static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
enum mbo_transition_reject_reason *reason)
{
u8 i;
struct wpa_bss *bss = wpa_s->current_bss;
struct wpa_bss *target;
struct wpa_bss *best_target = NULL;
struct wpa_bss *bss_in_list = NULL;
if (!bss)
return NULL;
wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
MAC2STR(wpa_s->bssid), bss->level);
wnm_clear_acceptable(wpa_s);
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
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;
}
/*
* TODO: Could consider allowing transition to another ESS if
* PMF was enabled for the association.
*/
if (!wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
1, 0)) {
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) does not match the current network profile",
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;
}
nei->acceptable = 1;
best_target = find_better_target(target, best_target);
if (target == bss)
bss_in_list = bss;
}
#ifdef CONFIG_MBO
if (wpa_s->wnm_mbo_trans_reason_present)
target = get_mbo_transition_candidate(wpa_s, reason);
else
target = best_target;
#else /* CONFIG_MBO */
target = best_target;
#endif /* CONFIG_MBO */
if (!target)
return NULL;
wpa_printf(MSG_DEBUG,
"WNM: Found an acceptable preferred transition candidate BSS "
MACSTR " (RSSI %d, tput: %d bss-tput: %d)",
MAC2STR(target->bssid), target->level,
target->est_throughput, bss->est_throughput);
if (!bss_in_list)
return target;
if ((!target->est_throughput && !bss_in_list->est_throughput) ||
(target->est_throughput > bss_in_list->est_throughput &&
target->est_throughput - bss_in_list->est_throughput >
bss_in_list->est_throughput >> 4)) {
/* It is more than 100/16 percent better, so switch. */
return target;
}
wpa_printf(MSG_DEBUG,
"WNM: Stay with our current BSS, not enough change in estimated throughput to switch");
return bss_in_list;
}
static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
{
const u8 *ie_a, *ie_b;
if (!a || !b)
return 0;
ie_a = wpa_bss_get_ie(a, eid);
ie_b = wpa_bss_get_ie(b, eid);
if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
return 0;
return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
}
static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
u32 info = 0;
info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
/*
* Leave the security and key scope bits unset to indicate that the
* security information is not available.
*/
if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
if (bss->caps & WLAN_CAPABILITY_QOS)
info |= NEI_REP_BSSID_INFO_QOS;
if (bss->caps & WLAN_CAPABILITY_APSD)
info |= NEI_REP_BSSID_INFO_APSD;
if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
info |= NEI_REP_BSSID_INFO_RM;
if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
info |= NEI_REP_BSSID_INFO_DELAYED_BA;
if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
info |= NEI_REP_BSSID_INFO_IMM_BA;
if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
info |= NEI_REP_BSSID_INFO_HT;
return info;
}
static int wnm_add_nei_rep(struct wpabuf **buf, const u8 *bssid,
u32 bss_info, u8 op_class, u8 chan, u8 phy_type,
u8 pref)
{
if (wpabuf_len(*buf) + 18 >
IEEE80211_MAX_MMPDU_SIZE - IEEE80211_HDRLEN) {
wpa_printf(MSG_DEBUG,
"WNM: No room in frame for Neighbor Report element");
return -1;
}
if (wpabuf_resize(buf, 18) < 0) {
wpa_printf(MSG_DEBUG,
"WNM: Failed to allocate memory for Neighbor Report element");
return -1;
}
wpabuf_put_u8(*buf, WLAN_EID_NEIGHBOR_REPORT);
/* length: 13 for basic neighbor report + 3 for preference subelement */
wpabuf_put_u8(*buf, 16);
wpabuf_put_data(*buf, bssid, ETH_ALEN);
wpabuf_put_le32(*buf, bss_info);
wpabuf_put_u8(*buf, op_class);
wpabuf_put_u8(*buf, chan);
wpabuf_put_u8(*buf, phy_type);
wpabuf_put_u8(*buf, WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE);
wpabuf_put_u8(*buf, 1);
wpabuf_put_u8(*buf, pref);
return 0;
}
static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
struct wpa_bss *bss, struct wpabuf **buf,
u8 pref)
{
const u8 *ie;
u8 op_class, chan;
int sec_chan = 0;
enum oper_chan_width vht = CONF_OPER_CHWIDTH_USE_HT;
enum phy_type phy_type;
u32 info;
struct ieee80211_ht_operation *ht_oper = NULL;
struct ieee80211_vht_operation *vht_oper = NULL;
ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
if (ie && ie[1] >= 2) {
ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
sec_chan = 1;
else if (ht_oper->ht_param &
HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
sec_chan = -1;
}
ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
if (ie && ie[1] >= 1) {
vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
if (vht_oper->vht_op_info_chwidth == CHANWIDTH_80MHZ ||
vht_oper->vht_op_info_chwidth == CHANWIDTH_160MHZ ||
vht_oper->vht_op_info_chwidth == CHANWIDTH_80P80MHZ)
vht = vht_oper->vht_op_info_chwidth;
}
if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
&chan) == NUM_HOSTAPD_MODES) {
wpa_printf(MSG_DEBUG,
"WNM: Cannot determine operating class and channel");
return -2;
}
phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
(vht_oper != NULL));
if (phy_type == PHY_TYPE_UNSPECIFIED) {
wpa_printf(MSG_DEBUG,
"WNM: Cannot determine BSS phy type for Neighbor Report");
return -2;
}
info = wnm_get_bss_info(wpa_s, bss);
return wnm_add_nei_rep(buf, bss->bssid, info, op_class, chan, phy_type,
pref);
}
static void wnm_add_cand_list(struct wpa_supplicant *wpa_s, struct wpabuf **buf)
{
unsigned int i, pref = 255;
struct os_reltime now;
struct wpa_ssid *ssid = wpa_s->current_ssid;
if (!ssid)
return;
/*
* TODO: Define when scan results are no longer valid for the candidate
* list.
*/
os_get_reltime(&now);
if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
return;
wpa_printf(MSG_DEBUG,
"WNM: Add candidate list to BSS Transition Management Response frame");
for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
struct wpa_bss *bss = wpa_s->last_scan_res[i];
int res;
if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1, 0)) {
res = wnm_nei_rep_add_bss(wpa_s, bss, buf, pref--);
if (res == -2)
continue; /* could not build entry for BSS */
if (res < 0)
break; /* no more room for candidates */
if (pref == 1)
break;
}
}
wpa_hexdump_buf(MSG_DEBUG,
"WNM: BSS Transition Management Response candidate list",
*buf);
}
#define BTM_RESP_MIN_SIZE 5 + ETH_ALEN
static int wnm_send_bss_transition_mgmt_resp(
struct wpa_supplicant *wpa_s,
enum bss_trans_mgmt_status_code status,
enum mbo_transition_reject_reason reason,
u8 delay, const u8 *target_bssid)
{
struct wpabuf *buf;
int res;
wpa_s->wnm_reply = 0;
wpa_printf(MSG_DEBUG,
"WNM: Send BSS Transition Management Response to " MACSTR
" dialog_token=%u status=%u reason=%u delay=%d",
MAC2STR(wpa_s->bssid), wpa_s->wnm_dialog_token, status,
reason, delay);
if (!wpa_s->current_bss) {
wpa_printf(MSG_DEBUG,
"WNM: Current BSS not known - drop response");
return -1;
}
buf = wpabuf_alloc(BTM_RESP_MIN_SIZE);
if (!buf) {
wpa_printf(MSG_DEBUG,
"WNM: Failed to allocate memory for BTM response");
return -1;
}
wpa_s->bss_tm_status = status;
wpas_notify_bss_tm_status(wpa_s);
wpabuf_put_u8(buf, WLAN_ACTION_WNM);
wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_RESP);
wpabuf_put_u8(buf, wpa_s->wnm_dialog_token);
wpabuf_put_u8(buf, status);
wpabuf_put_u8(buf, delay);
if (target_bssid) {
wpabuf_put_data(buf, target_bssid, 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.
*/
wpabuf_put_data(buf, "\0\0\0\0\0\0", ETH_ALEN);
}
if (status == WNM_BSS_TM_ACCEPT && target_bssid)
wnm_add_cand_list(wpa_s, &buf);
#ifdef CONFIG_MBO
if (status != WNM_BSS_TM_ACCEPT &&
wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE)) {
u8 mbo[10];
size_t ret;
ret = wpas_mbo_ie_bss_trans_reject(wpa_s, mbo, sizeof(mbo),
reason);
if (ret) {
if (wpabuf_resize(&buf, ret) < 0) {
wpabuf_free(buf);
wpa_printf(MSG_DEBUG,
"WNM: Failed to allocate memory for MBO IE");
return -1;
}
wpabuf_put_data(buf, mbo, ret);
}
}
#endif /* CONFIG_MBO */
res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head_u8(buf), wpabuf_len(buf), 0);
if (res < 0) {
wpa_printf(MSG_DEBUG,
"WNM: Failed to send BSS Transition Management Response");
}
wpabuf_free(buf);
return res;
}
static void wnm_bss_tm_connect(struct wpa_supplicant *wpa_s,
struct wpa_bss *bss, struct wpa_ssid *ssid,
int after_new_scan)
{
struct wpa_radio_work *already_connecting;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Transition to BSS " MACSTR
" based on BSS Transition Management Request (old BSSID "
MACSTR " after_new_scan=%d)",
MAC2STR(bss->bssid), MAC2STR(wpa_s->bssid), after_new_scan);
/* Send the BSS Management Response - Accept */
if (wpa_s->wnm_reply) {
wpa_s->wnm_target_bss = bss;
wpa_printf(MSG_DEBUG,
"WNM: Sending successful BSS Transition Management Response");
/* This function will be called again from the TX handler to
* start the actual reassociation after this response has been
* delivered to the current AP. */
if (wnm_send_bss_transition_mgmt_resp(
wpa_s, WNM_BSS_TM_ACCEPT,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
bss->bssid) >= 0)
return;
}
if (bss == wpa_s->current_bss) {
wpa_printf(MSG_DEBUG,
"WNM: Already associated with the preferred candidate");
wnm_btm_reset(wpa_s);
return;
}
already_connecting = radio_work_pending(wpa_s, "sme-connect");
wpa_s->reassociate = 1;
wpa_printf(MSG_DEBUG, "WNM: Issuing connect");
wpa_supplicant_connect(wpa_s, bss, ssid);
/*
* Indicate that a BSS transition is in progress so scan results that
* come in before the 'sme-connect' radio work gets executed do not
* override the original connection attempt.
*/
if (!already_connecting && radio_work_pending(wpa_s, "sme-connect"))
wpa_s->bss_trans_mgmt_in_progress = true;
}
int wnm_scan_process(struct wpa_supplicant *wpa_s, bool pre_scan_check)
{
struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid;
enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
enum mbo_transition_reject_reason reason =
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED;
if (!wpa_s->wnm_dialog_token)
return 0;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Process scan results for BSS Transition Management");
if (!pre_scan_check &&
os_reltime_initialized(&wpa_s->wnm_cand_valid_until) &&
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");
goto send_bss_resp_fail;
}
if (!pre_scan_check && !wpa_s->wnm_transition_scan)
return 0;
wpa_s->wnm_transition_scan = false;
/* Compare the Neighbor Report and scan results */
bss = compare_scan_neighbor_results(wpa_s, &reason);
/*
* If this is a pre-scan check, returning 0 will trigger a scan and
* another call. In that case, reject "bad" candidates in the hope of
* finding a better candidate after scanning.
*
* Use a simple heuristic to check whether the selection is reasonable
* or a scan is a good idea. For that, we need to have found a
* candidate BSS (which might be the current one), it is up-to-date,
* and we don't want to immediately roam back again.
*/
if (pre_scan_check) {
struct os_reltime age;
if (!bss)
return 0;
os_reltime_age(&bss->last_update, &age);
if (age.sec >= 10)
return 0;
#ifndef CONFIG_NO_ROAMING
if (wpa_s->current_bss && bss != wpa_s->current_bss &&
wpa_supplicant_need_to_roam_within_ess(wpa_s,
wpa_s->current_bss,
bss))
return 0;
#endif /* CONFIG_NO_ROAMING */
}
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 */
wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
return 1;
send_bss_resp_fail:
if (wpa_s->wnm_reply) {
/* If disassoc imminent is set, we must not reject */
if (wpa_s->wnm_mode &
(WNM_BSS_TM_REQ_DISASSOC_IMMINENT |
WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)) {
wpa_printf(MSG_DEBUG,
"WNM: Accept BTM request because disassociation imminent bit is set");
status = WNM_BSS_TM_ACCEPT;
}
wnm_send_bss_transition_mgmt_resp(wpa_s, status, reason,
0, NULL);
}
wnm_btm_reset(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->disassoc_imminent && !bb->disassoc_imminent)
return 1;
if (bb->disassoc_imminent && !aa->disassoc_imminent)
return -1;
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->preference_present && nei->preference == 0)
continue;
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 int wnm_parse_candidate_list(struct wpa_supplicant *wpa_s,
const u8 *pos, const u8 *end)
{
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 -1;
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 -1;
}
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);
if ((wpa_s->wnm_mode &
WNM_BSS_TM_REQ_DISASSOC_IMMINENT) &&
ether_addr_equal(rep->bssid, wpa_s->bssid))
rep->disassoc_imminent = 1;
wpa_s->wnm_num_neighbor_report++;
#ifdef CONFIG_MBO
if (wpa_s->wnm_mbo_trans_reason_present &&
wpa_s->wnm_num_neighbor_report == 1) {
rep->is_first = 1;
wpa_printf(MSG_DEBUG,
"WNM: First transition candidate is "
MACSTR, MAC2STR(rep->bssid));
}
#endif /* CONFIG_MBO */
}
pos += len;
}
return 0;
}
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;
#ifdef CONFIG_MBO
const u8 *vendor;
#endif /* CONFIG_MBO */
bool disassoc_imminent;
if (wpa_s->disable_mbo_oce || wpa_s->conf->disable_btm)
return;
if (end - pos < 5)
return;
if (wpa_s->current_bss)
beacon_int = wpa_s->current_bss->beacon_int;
else
beacon_int = 100; /* best guess */
wnm_btm_reset(wpa_s);
wpa_s->wnm_dialog_token = pos[0];
wpa_s->wnm_mode = pos[1];
wpa_s->wnm_disassoc_timer = WPA_GET_LE16(pos + 2);
wpa_s->wnm_link_removal = false;
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_disassoc_timer, valid_int);
if (!wpa_s->wnm_dialog_token) {
wpa_printf(MSG_DEBUG, "WNM: Invalid dialog token");
goto reset;
}
#if defined(CONFIG_MBO) && defined(CONFIG_TESTING_OPTIONS)
if (wpa_s->reject_btm_req_reason) {
wpa_printf(MSG_INFO,
"WNM: Testing - reject BSS Transition Management Request: reject_btm_req_reason=%d",
wpa_s->reject_btm_req_reason);
wnm_send_bss_transition_mgmt_resp(
wpa_s, wpa_s->reject_btm_req_reason,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
goto reset;
}
#endif /* CONFIG_MBO && CONFIG_TESTING_OPTIONS */
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");
goto reset;
}
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];
u8 url_len;
if (end - pos < 1) {
wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
"Management Request (URL)");
goto reset;
}
url_len = *pos++;
if (url_len > end - pos) {
wpa_printf(MSG_DEBUG,
"WNM: Invalid BSS Transition Management Request (URL truncated)");
goto reset;
}
os_memcpy(url, pos, url_len);
url[url_len] = '\0';
pos += url_len;
wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
wpa_sm_pmf_enabled(wpa_s->wpa),
wpa_s->wnm_disassoc_timer * beacon_int * 128 / 125,
url);
}
disassoc_imminent = wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT;
/*
* Based on IEEE P802.11be/D5.0, when a station is a non-AP MLD with
* more than one affiliated link, the Link Removal Imminent field is
* set to 1, and the BSS Termination Included field is set to 1, only
* one of the links is removed and the other links remain associated.
* Ignore the Disassociation Imminent field in such a case.
*
* TODO: We should check if the AP has more than one link.
* TODO: We should pass the RX link and use that
*/
if (disassoc_imminent && wpa_s->valid_links &&
(wpa_s->wnm_mode & WNM_BSS_TM_REQ_LINK_REMOVAL_IMMINENT) &&
(wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED)) {
/* If we still have a link, then just accept the request */
if (wpa_s->valid_links & (wpa_s->valid_links - 1)) {
wpa_printf(MSG_INFO,
"WNM: BTM request for a single MLO link - ignore disassociation imminent since other links remain associated");
disassoc_imminent = false;
wnm_send_bss_transition_mgmt_resp(
wpa_s, WNM_BSS_TM_ACCEPT, 0, 0, NULL);
goto reset;
}
/* The last link is being removed (which must be the assoc link)
*/
wpa_s->wnm_link_removal = true;
wpa_s->wnm_disassoc_mld = false;
os_memcpy(wpa_s->wnm_disassoc_addr,
wpa_s->links[wpa_s->mlo_assoc_link_id].bssid,
ETH_ALEN);
} else if (wpa_s->valid_links) {
wpa_s->wnm_disassoc_mld = true;
os_memcpy(wpa_s->wnm_disassoc_addr, wpa_s->ap_mld_addr,
ETH_ALEN);
} else {
wpa_s->wnm_disassoc_mld = false;
os_memcpy(wpa_s->wnm_disassoc_addr, wpa_s->bssid, ETH_ALEN);
}
if (disassoc_imminent)
wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
"Disassociation Timer %u", wpa_s->wnm_disassoc_timer);
#ifdef CONFIG_MBO
vendor = get_ie(pos, end - pos, WLAN_EID_VENDOR_SPECIFIC);
if (vendor)
wpas_mbo_ie_trans_req(wpa_s, vendor + 2, vendor[1]);
#endif /* CONFIG_MBO */
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");
if (wnm_parse_candidate_list(wpa_s, pos, end) < 0)
goto reset;
if (!wpa_s->wnm_num_neighbor_report) {
wpa_printf(MSG_DEBUG,
"WNM: Candidate list included bit is set, but no candidates found");
wnm_send_bss_transition_mgmt_resp(
wpa_s, WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
NULL);
goto reset;
}
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);
os_reltime_add_ms(&wpa_s->wnm_cand_valid_until, valid_ms);
} else if (!disassoc_imminent) {
enum bss_trans_mgmt_status_code status;
/* No candidate list and disassociation is not imminent */
if ((wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) ||
wpa_s->wnm_link_removal)
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;
}
if (reply)
wnm_send_bss_transition_mgmt_resp(
wpa_s, status,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
NULL);
goto reset;
}
/*
* Try fetching the latest scan results from the kernel.
* This can help in finding more up-to-date information should
* the driver have done some internal scanning operations after
* the last scan result update in wpa_supplicant.
*
* It is not a new scan, this does not update the last_scan
* timestamp nor will it expire old BSSs.
*/
wpa_supplicant_update_scan_results(wpa_s, NULL);
if (wnm_scan_process(wpa_s, true) > 0)
return;
wpa_printf(MSG_DEBUG,
"WNM: No valid match in previous scan results - try a new scan");
/*
* If we have a fixed BSSID configured, just reject at this point.
* NOTE: We could actually check if we are allowed to stay (and we do
* above if we have scan results available).
*/
if (wpa_s->current_ssid && wpa_s->current_ssid->bssid_set) {
wpa_printf(MSG_DEBUG, "WNM: Fixed BSSID, rejecting request");
if (reply)
wnm_send_bss_transition_mgmt_resp(
wpa_s, WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
NULL);
goto reset;
}
wnm_set_scan_freqs(wpa_s);
if (wpa_s->wnm_num_neighbor_report == 1) {
os_memcpy(wpa_s->next_scan_bssid,
wpa_s->wnm_neighbor_report_elements[0].bssid,
ETH_ALEN);
wpa_printf(MSG_DEBUG,
"WNM: Scan only for a specific BSSID since there is only a single candidate "
MACSTR, MAC2STR(wpa_s->next_scan_bssid));
}
wpa_s->wnm_transition_scan = true;
wpa_supplicant_req_scan(wpa_s, 0, 0);
/* Continue from scan handler */
return;
reset:
wnm_btm_reset(wpa_s);
}
int wnm_btm_resp_tx_status(struct wpa_supplicant *wpa_s, const u8 *data,
size_t data_len)
{
const struct ieee80211_mgmt *frame =
(const struct ieee80211_mgmt *) data;
if (data_len <
IEEE80211_HDRLEN + sizeof(frame->u.action.u.bss_tm_resp) ||
frame->u.action.category != WLAN_ACTION_WNM ||
frame->u.action.u.bss_tm_resp.action != WNM_BSS_TRANS_MGMT_RESP ||
frame->u.action.u.bss_tm_resp.status_code != WNM_BSS_TM_ACCEPT)
return -1;
/*
* If disassoc imminent bit was set in the request, the response may
* indicate accept even if no candidate was found, so bail out here.
*/
if (!wpa_s->wnm_target_bss) {
wpa_printf(MSG_DEBUG, "WNM: Target BSS is not set");
return 0;
}
if (!wpa_s->current_ssid)
return 0;
wnm_bss_tm_connect(wpa_s, wpa_s->wnm_target_bss, wpa_s->current_ssid,
0);
wpa_s->wnm_target_bss = NULL;
return 0;
}
#define BTM_QUERY_MIN_SIZE 4
int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
u8 query_reason,
const char *btm_candidates,
int cand_list)
{
struct wpabuf *buf;
int ret;
wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
MACSTR " query_reason=%u%s",
MAC2STR(wpa_s->bssid), query_reason,
cand_list ? " candidate list" : "");
buf = wpabuf_alloc(BTM_QUERY_MIN_SIZE);
if (!buf)
return -1;
wpabuf_put_u8(buf, WLAN_ACTION_WNM);
wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_QUERY);
wpabuf_put_u8(buf, 1);
wpabuf_put_u8(buf, query_reason);
if (cand_list)
wnm_add_cand_list(wpa_s, &buf);
if (btm_candidates) {
const size_t max_len = 1000;
ret = wpabuf_resize(&buf, max_len);
if (ret < 0) {
wpabuf_free(buf);
return ret;
}
ret = ieee802_11_parse_candidate_list(btm_candidates,
wpabuf_put(buf, 0),
max_len);
if (ret < 0) {
wpabuf_free(buf);
return ret;
}
wpabuf_put(buf, ret);
}
ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head_u8(buf), wpabuf_len(buf), 0);
wpabuf_free(buf);
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;
}
if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
WPA_GET_BE24(pos) == OUI_WFA &&
pos[3] == HS20_WNM_T_C_ACCEPTANCE) {
const u8 *ie_end;
u8 url_len;
char *url;
ie_end = pos + ie_len;
pos += 4;
url_len = *pos++;
wpa_printf(MSG_DEBUG,
"WNM: HS 2.0 Terms and Conditions Acceptance (URL Length %u)",
url_len);
if (url_len > ie_end - pos)
break;
url = os_malloc(url_len + 1);
if (!url)
break;
os_memcpy(url, pos, url_len);
url[url_len] = '\0';
hs20_rx_t_c_acceptance(wpa_s, 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 ||
(!ether_addr_equal(sa, wpa_s->bssid) &&
(!wpa_s->valid_links ||
!ether_addr_equal(sa, wpa_s->ap_mld_addr)))) {
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;
}
}
static void ieee802_11_rx_wnm_coloc_intf_req(struct wpa_supplicant *wpa_s,
const u8 *sa, const u8 *frm,
int len)
{
u8 dialog_token, req_info, auto_report, timeout;
if (!wpa_s->conf->coloc_intf_reporting)
return;
/* Dialog Token [1] | Request Info [1] */
if (len < 2)
return;
dialog_token = frm[0];
req_info = frm[1];
auto_report = req_info & 0x03;
timeout = req_info >> 2;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Received Collocated Interference Request (dialog_token %u auto_report %u timeout %u sa " MACSTR ")",
dialog_token, auto_report, timeout, MAC2STR(sa));
if (dialog_token == 0)
return; /* only nonzero values are used for request */
if (wpa_s->wpa_state != WPA_COMPLETED ||
(!ether_addr_equal(sa, wpa_s->bssid) &&
(!wpa_s->valid_links ||
!ether_addr_equal(sa, wpa_s->ap_mld_addr)))) {
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Collocated Interference Request frame not from current AP - ignore it");
return;
}
wpa_msg(wpa_s, MSG_INFO, COLOC_INTF_REQ "%u %u %u",
dialog_token, auto_report, timeout);
wpa_s->coloc_intf_dialog_token = dialog_token;
wpa_s->coloc_intf_auto_report = auto_report;
wpa_s->coloc_intf_timeout = timeout;
}
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 ||
(!ether_addr_equal(mgmt->sa, wpa_s->bssid) &&
(!wpa_s->valid_links ||
!ether_addr_equal(mgmt->sa, wpa_s->ap_mld_addr)))) {
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;
case WNM_COLLOCATED_INTERFERENCE_REQ:
ieee802_11_rx_wnm_coloc_intf_req(wpa_s, mgmt->sa, pos,
end - pos);
break;
default:
wpa_printf(MSG_ERROR, "WNM: Unknown request");
break;
}
}
int wnm_send_coloc_intf_report(struct wpa_supplicant *wpa_s, u8 dialog_token,
const struct wpabuf *elems)
{
struct wpabuf *buf;
int ret;
if (wpa_s->wpa_state < WPA_ASSOCIATED || !elems)
return -1;
wpa_printf(MSG_DEBUG, "WNM: Send Collocated Interference Report to "
MACSTR " (dialog token %u)",
MAC2STR(wpa_s->bssid), dialog_token);
buf = wpabuf_alloc(3 + wpabuf_len(elems));
if (!buf)
return -1;
wpabuf_put_u8(buf, WLAN_ACTION_WNM);
wpabuf_put_u8(buf, WNM_COLLOCATED_INTERFERENCE_REPORT);
wpabuf_put_u8(buf, dialog_token);
wpabuf_put_buf(buf, elems);
ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head_u8(buf), wpabuf_len(buf), 0);
wpabuf_free(buf);
return ret;
}
void wnm_set_coloc_intf_elems(struct wpa_supplicant *wpa_s,
struct wpabuf *elems)
{
if (elems && wpabuf_len(elems) == 0) {
wpabuf_free(elems);
elems = NULL;
}
/* NOTE: The elements are not stored as they are only send out once */
if (wpa_s->conf->coloc_intf_reporting && elems &&
wpa_s->coloc_intf_dialog_token &&
(wpa_s->coloc_intf_auto_report == 1 ||
wpa_s->coloc_intf_auto_report == 3)) {
/* TODO: Check that there has not been less than
* wpa_s->coloc_intf_timeout * 200 TU from the last report.
*/
wnm_send_coloc_intf_report(wpa_s,
wpa_s->coloc_intf_dialog_token,
elems);
}
wpabuf_free(elems);
}
void wnm_clear_coloc_intf_reporting(struct wpa_supplicant *wpa_s)
{
wpa_s->coloc_intf_dialog_token = 0;
wpa_s->coloc_intf_auto_report = 0;
}
bool wnm_is_bss_excluded(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
int i;
/*
* In case disassociation imminent is set, do no try to use a BSS to
* which we are connected.
*/
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
if (!wpa_s->wnm_disassoc_mld) {
if (ether_addr_equal(bss->bssid,
wpa_s->wnm_disassoc_addr))
return true;
} else {
if (ether_addr_equal(bss->mld_addr,
wpa_s->wnm_disassoc_addr))
return true;
}
}
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
if (!ether_addr_equal(nei->bssid, bss->bssid))
continue;
if (nei->preference_present && nei->preference == 0)
return true;
break;
}
/* If the abridged bit is set, the BSS must be a known neighbor. */
if ((wpa_s->wnm_mode & WNM_BSS_TM_REQ_ABRIDGED) &&
wpa_s->wnm_num_neighbor_report == i)
return true;
return false;
}
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