![Dan Nicholson](/assets/img/avatar_default.png)
The scan path to initiate another scan if the initial association failed was broken due to wpa_s->scan_req being zeroed earlier in wpa_supplicant_scan(). This caused the second scan to bail out early since it thought this was not a requested scan.
216 lines
5.9 KiB
C
216 lines
5.9 KiB
C
/*
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* WPA Supplicant - Scanning
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* Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "eloop.h"
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#include "config.h"
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#include "wpa_supplicant_i.h"
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#include "mlme.h"
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#include "uuid.h"
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static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
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{
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struct wpa_ssid *ssid;
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union wpa_event_data data;
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ssid = wpa_supplicant_get_ssid(wpa_s);
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if (ssid == NULL)
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return;
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if (wpa_s->current_ssid == NULL)
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wpa_s->current_ssid = ssid;
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wpa_supplicant_initiate_eapol(wpa_s);
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wpa_printf(MSG_DEBUG, "Already associated with a configured network - "
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"generating associated event");
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os_memset(&data, 0, sizeof(data));
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wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
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}
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static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
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{
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struct wpa_supplicant *wpa_s = eloop_ctx;
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struct wpa_ssid *ssid;
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int enabled, scan_req = 0, ret;
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const u8 *extra_ie = NULL;
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size_t extra_ie_len = 0;
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if (wpa_s->disconnected && !wpa_s->scan_req)
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return;
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enabled = 0;
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ssid = wpa_s->conf->ssid;
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while (ssid) {
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if (!ssid->disabled) {
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enabled++;
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break;
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}
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ssid = ssid->next;
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}
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if (!enabled && !wpa_s->scan_req) {
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wpa_printf(MSG_DEBUG, "No enabled networks - do not scan");
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wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
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return;
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}
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scan_req = wpa_s->scan_req;
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wpa_s->scan_req = 0;
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if (wpa_s->conf->ap_scan != 0 &&
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wpa_s->driver && os_strcmp(wpa_s->driver->name, "wired") == 0) {
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wpa_printf(MSG_DEBUG, "Using wired driver - overriding "
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"ap_scan configuration");
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wpa_s->conf->ap_scan = 0;
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}
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if (wpa_s->conf->ap_scan == 0) {
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wpa_supplicant_gen_assoc_event(wpa_s);
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return;
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}
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if (wpa_s->wpa_state == WPA_DISCONNECTED ||
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wpa_s->wpa_state == WPA_INACTIVE)
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wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
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ssid = wpa_s->conf->ssid;
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if (wpa_s->prev_scan_ssid != BROADCAST_SSID_SCAN) {
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while (ssid) {
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if (ssid == wpa_s->prev_scan_ssid) {
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ssid = ssid->next;
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break;
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}
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ssid = ssid->next;
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}
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}
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while (ssid) {
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if (!ssid->disabled &&
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(ssid->scan_ssid || wpa_s->conf->ap_scan == 2))
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break;
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ssid = ssid->next;
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}
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if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
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/*
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* ap_scan=2 mode - try to associate with each SSID instead of
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* scanning for each scan_ssid=1 network.
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*/
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if (ssid == NULL) {
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wpa_printf(MSG_DEBUG, "wpa_supplicant_scan: Reached "
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"end of scan list - go back to beginning");
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wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
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wpa_supplicant_req_scan(wpa_s, 0, 0);
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return;
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}
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if (ssid->next) {
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/* Continue from the next SSID on the next attempt. */
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wpa_s->prev_scan_ssid = ssid;
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} else {
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/* Start from the beginning of the SSID list. */
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wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
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}
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wpa_supplicant_associate(wpa_s, NULL, ssid);
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return;
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}
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wpa_printf(MSG_DEBUG, "Starting AP scan (%s SSID)",
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ssid ? "specific": "broadcast");
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if (ssid) {
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wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
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ssid->ssid, ssid->ssid_len);
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wpa_s->prev_scan_ssid = ssid;
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} else
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wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
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if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
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!wpa_s->use_client_mlme) {
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wpa_s->scan_res_tried++;
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wpa_s->scan_req = scan_req;
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wpa_printf(MSG_DEBUG, "Trying to get current scan results "
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"first without requesting a new scan to speed up "
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"initial association");
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wpa_supplicant_event(wpa_s, EVENT_SCAN_RESULTS, NULL);
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return;
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}
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if (wpa_s->use_client_mlme) {
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ieee80211_sta_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len);
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ret = ieee80211_sta_req_scan(wpa_s, ssid ? ssid->ssid : NULL,
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ssid ? ssid->ssid_len : 0);
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} else {
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wpa_drv_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len);
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ret = wpa_drv_scan(wpa_s, ssid ? ssid->ssid : NULL,
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ssid ? ssid->ssid_len : 0);
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}
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if (ret) {
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wpa_printf(MSG_WARNING, "Failed to initiate AP scan.");
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wpa_supplicant_req_scan(wpa_s, 10, 0);
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}
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}
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/**
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* wpa_supplicant_req_scan - Schedule a scan for neighboring access points
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* @wpa_s: Pointer to wpa_supplicant data
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* @sec: Number of seconds after which to scan
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* @usec: Number of microseconds after which to scan
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*
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* This function is used to schedule a scan for neighboring access points after
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* the specified time.
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*/
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void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
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{
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/* If there's at least one network that should be specifically scanned
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* then don't cancel the scan and reschedule. Some drivers do
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* background scanning which generates frequent scan results, and that
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* causes the specific SSID scan to get continually pushed back and
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* never happen, which causes hidden APs to never get probe-scanned.
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*/
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if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
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wpa_s->conf->ap_scan == 1) {
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struct wpa_ssid *ssid = wpa_s->conf->ssid;
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while (ssid) {
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if (!ssid->disabled && ssid->scan_ssid)
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break;
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ssid = ssid->next;
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}
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if (ssid) {
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wpa_msg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
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"ensure that specific SSID scans occur");
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return;
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}
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}
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wpa_msg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
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sec, usec);
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eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
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eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
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}
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/**
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* wpa_supplicant_cancel_scan - Cancel a scheduled scan request
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* @wpa_s: Pointer to wpa_supplicant data
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*
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* This function is used to cancel a scan request scheduled with
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* wpa_supplicant_req_scan().
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*/
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void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
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{
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wpa_msg(wpa_s, MSG_DEBUG, "Cancelling scan request");
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eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
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}
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