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hostapd/wpa_supplicant/wnm_sta.c
Ben Greear 67bf89f554 WNM: Choose the best available BSS, not just the first one 
This should allow STA to make better choice about which BSS to roam to.

Use estimated throughput as comparison value. Can improve the estimated
throughput calculation to improve this selection criteria if wanted in
the future.

Signed-off-by: Ben Greear <greearb@candelatech.com>
2023-10-28 19:54:41 +03:00

2031 lines
53 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
#define WNM_SCAN_RESULT_AGE 2 /* 2 seconds */
/* 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_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;
wpabuf_free(wpa_s->coloc_intf_elems);
wpa_s->coloc_intf_elems = 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:
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 &&
os_memcmp(first_candidate_bssid,
info->candidates[i].bssid, ETH_ALEN) == 0)
{
*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, os_time_t age_secs,
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];
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 (age_secs) {
struct os_reltime now;
if (os_get_reltime(&now) == 0 &&
os_reltime_expired(&now, &target->last_update,
age_secs)) {
wpa_printf(MSG_DEBUG,
"Candidate BSS is more than %ld seconds old",
age_secs);
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 (wpa_s->current_ssid &&
!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 (wpa_is_bss_tmp_disallowed(wpa_s, target)) {
wpa_printf(MSG_DEBUG,
"MBO: Candidate BSS " MACSTR
" retry delay is not over yet",
MAC2STR(nei->bssid));
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 void wnm_send_bss_transition_mgmt_resp(
struct wpa_supplicant *wpa_s, u8 dialog_token,
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_printf(MSG_DEBUG,
"WNM: Send BSS Transition Management Response to " MACSTR
" dialog_token=%u status=%u reason=%u delay=%d",
MAC2STR(wpa_s->bssid), dialog_token, status, reason, delay);
if (!wpa_s->current_bss) {
wpa_printf(MSG_DEBUG,
"WNM: Current BSS not known - drop response");
return;
}
buf = wpabuf_alloc(BTM_RESP_MIN_SIZE);
if (!buf) {
wpa_printf(MSG_DEBUG,
"WNM: Failed to allocate memory for BTM response");
return;
}
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, 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)
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;
}
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);
}
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_reply = 0;
wpa_printf(MSG_DEBUG,
"WNM: Sending successful BSS Transition Management Response");
wnm_send_bss_transition_mgmt_resp(
wpa_s, wpa_s->wnm_dialog_token, WNM_BSS_TM_ACCEPT,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
bss->bssid);
}
if (bss == wpa_s->current_bss) {
wpa_printf(MSG_DEBUG,
"WNM: Already associated with the preferred candidate");
wnm_deallocate_memory(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;
wnm_deallocate_memory(wpa_s);
}
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;
enum mbo_transition_reject_reason reason =
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED;
if (!wpa_s->wnm_neighbor_report_elements)
return 0;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Process scan results for BSS Transition Management");
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, 0, &reason);
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 (!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, reason, 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->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->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_fetch_scan_results(struct wpa_supplicant *wpa_s)
{
struct wpa_scan_results *scan_res;
struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid;
u8 i, found = 0;
size_t j;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Fetch current scan results from the driver for checking transition candidates");
scan_res = wpa_drv_get_scan_results2(wpa_s);
if (!scan_res) {
wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Failed to get scan results");
return 0;
}
if (scan_res->fetch_time.sec == 0)
os_get_reltime(&scan_res->fetch_time);
filter_scan_res(wpa_s, scan_res);
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;
for (j = 0; j < scan_res->num; j++) {
struct wpa_scan_res *res;
const u8 *ssid_ie;
res = scan_res->res[j];
if (os_memcmp(nei->bssid, res->bssid, ETH_ALEN) != 0 ||
res->age > WNM_SCAN_RESULT_AGE * 1000)
continue;
bss = wpa_s->current_bss;
ssid_ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
if (bss && ssid_ie && ssid_ie[1] &&
(bss->ssid_len != ssid_ie[1] ||
os_memcmp(bss->ssid, ssid_ie + 2,
bss->ssid_len) != 0))
continue; /* Skip entries for other ESSs */
/* Potential candidate found */
found = 1;
scan_snr(res);
scan_est_throughput(wpa_s, res);
wpa_bss_update_scan_res(wpa_s, res,
&scan_res->fetch_time);
}
}
wpa_scan_results_free(scan_res);
if (!found) {
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: No transition candidate matches existing scan results");
return 0;
}
bss = compare_scan_neighbor_results(wpa_s, WNM_SCAN_RESULT_AGE, NULL);
if (!bss) {
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Comparison of scan results against transition candidates did not find matches");
return 0;
}
/* Associate to the network */
wnm_bss_tm_connect(wpa_s, bss, ssid, 0);
return 1;
}
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 */
if (wpa_s->disable_mbo_oce || wpa_s->conf->disable_btm)
return;
if (end - pos < 5)
return;
#ifdef CONFIG_MBO
wpa_s->wnm_mbo_trans_reason_present = 0;
wpa_s->wnm_mbo_transition_reason = 0;
#endif /* CONFIG_MBO */
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);
#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->wnm_dialog_token,
wpa_s->reject_btm_req_reason,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
return;
}
#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");
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];
u8 url_len;
if (end - pos < 1) {
wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
"Management Request (URL)");
return;
}
url_len = *pos++;
if (url_len > end - pos) {
wpa_printf(MSG_DEBUG,
"WNM: Invalid BSS Transition Management Request (URL truncated)");
return;
}
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_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) {
wpa_printf(MSG_DEBUG, "Trying to find another BSS");
wpa_supplicant_req_scan(wpa_s, 0, 0);
}
}
#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");
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);
if ((wpa_s->wnm_mode &
WNM_BSS_TM_REQ_DISASSOC_IMMINENT) &&
os_memcmp(rep->bssid, wpa_s->bssid,
ETH_ALEN) == 0)
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;
}
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, wpa_s->wnm_dialog_token,
WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
NULL);
return;
}
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);
/*
* Fetch the latest scan results from the kernel and check for
* candidates based on those results first. This can help in
* finding more up-to-date information should the driver has
* done some internal scanning operations after the last scan
* result update in wpa_supplicant.
*/
if (wnm_fetch_scan_results(wpa_s) > 0)
return;
/*
* Try to use previously received scan results, if they are
* recent enough to use for a connection.
*/
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);
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_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,
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
}
}
#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 ||
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;
}
}
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 ||
os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
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 ||
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;
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)
{
wpabuf_free(wpa_s->coloc_intf_elems);
if (elems && wpabuf_len(elems) == 0) {
wpabuf_free(elems);
elems = NULL;
}
wpa_s->coloc_intf_elems = elems;
if (wpa_s->conf->coloc_intf_reporting && wpa_s->coloc_intf_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,
wpa_s->coloc_intf_elems);
}
}
void wnm_clear_coloc_intf_reporting(struct wpa_supplicant *wpa_s)
{
#ifdef CONFIG_WNM
wpa_s->coloc_intf_dialog_token = 0;
wpa_s->coloc_intf_auto_report = 0;
#endif /* CONFIG_WNM */
}
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