Exemplo n.º 1
0
static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
{
	struct wpabuf *extra_ie = NULL;
#ifdef CONFIG_WPS
	int wps = 0;
	enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
#endif /* CONFIG_WPS */

#ifdef CONFIG_INTERWORKING
	if (wpa_s->conf->interworking &&
	    wpabuf_resize(&extra_ie, 100) == 0)
		wpas_add_interworking_elements(wpa_s, extra_ie);
#endif /* CONFIG_INTERWORKING */

#ifdef CONFIG_WPS
	wps = wpas_wps_in_use(wpa_s, &req_type);

	if (wps) {
		struct wpabuf *wps_ie;
		wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
						DEV_PW_DEFAULT,
						&wpa_s->wps->dev,
						wpa_s->wps->uuid, req_type,
						0, NULL);
		if (wps_ie) {
			if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
				wpabuf_put_buf(extra_ie, wps_ie);
			wpabuf_free(wps_ie);
		}
	}

#ifdef CONFIG_P2P
	if (wps) {
		size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
		if (wpabuf_resize(&extra_ie, ielen) == 0)
			wpas_p2p_scan_ie(wpa_s, extra_ie);
	}
#endif /* CONFIG_P2P */

#endif /* CONFIG_WPS */

#ifdef CONFIG_HS20
	if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
		wpas_hs20_add_indication(extra_ie);
#endif /* CONFIG_HS20 */

	return extra_ie;
}
Exemplo n.º 2
0
static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
{
	struct wpa_supplicant *wpa_s = eloop_ctx;
	struct wpa_ssid *ssid;
	int scan_req = 0, ret;
	struct wpabuf *wps_ie = NULL;
#ifdef CONFIG_WPS
	int wps = 0;
	enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
#endif /* CONFIG_WPS */
	struct wpa_driver_scan_params params;
	size_t max_ssids;
	enum wpa_states prev_state;

	if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
		wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
		return;
	}

	if (wpa_s->disconnected && !wpa_s->scan_req) {
		wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
		return;
	}

	if (!wpa_supplicant_enabled_networks(wpa_s->conf) &&
	    !wpa_s->scan_req) {
		wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
		wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
		return;
	}

	if (wpa_s->conf->ap_scan != 0 &&
	    (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
		wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
			"overriding ap_scan configuration");
		wpa_s->conf->ap_scan = 0;
		wpas_notify_ap_scan_changed(wpa_s);
	}

	if (wpa_s->conf->ap_scan == 0) {
		wpa_supplicant_gen_assoc_event(wpa_s);
		return;
	}

	if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) ||
	    wpa_s->conf->ap_scan == 2)
		max_ssids = 1;
	else {
		max_ssids = wpa_s->max_scan_ssids;
		if (max_ssids > WPAS_MAX_SCAN_SSIDS)
			max_ssids = WPAS_MAX_SCAN_SSIDS;
	}

#ifdef CONFIG_WPS
	wps = wpas_wps_in_use(wpa_s->conf, &req_type);
#endif /* CONFIG_WPS */

	scan_req = wpa_s->scan_req;
	wpa_s->scan_req = 0;

	os_memset(&params, 0, sizeof(params));

	prev_state = wpa_s->wpa_state;
	if (wpa_s->wpa_state == WPA_DISCONNECTED ||
	    wpa_s->wpa_state == WPA_INACTIVE)
		wpa_supplicant_set_state(wpa_s, WPA_SCANNING);

	/* Find the starting point from which to continue scanning */
	ssid = wpa_s->conf->ssid;
	if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
		while (ssid) {
			if (ssid == wpa_s->prev_scan_ssid) {
				ssid = ssid->next;
				break;
			}
			ssid = ssid->next;
		}
	}

	if (scan_req != 2 && (wpa_s->conf->ap_scan == 2 ||
			      wpa_s->connect_without_scan)) {
		wpa_s->connect_without_scan = 0;
		wpa_supplicant_assoc_try(wpa_s, ssid);
		return;
	} else if (wpa_s->conf->ap_scan == 2) {
		/*
		 * User-initiated scan request in ap_scan == 2; scan with
		 * wildcard SSID.
		 */
		ssid = NULL;
	} else {
		struct wpa_ssid *start = ssid, *tssid;
		int freqs_set = 0;
		if (ssid == NULL && max_ssids > 1)
			ssid = wpa_s->conf->ssid;
		while (ssid) {
			if (!ssid->disabled && ssid->scan_ssid) {
				wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
						  ssid->ssid, ssid->ssid_len);
				params.ssids[params.num_ssids].ssid =
					ssid->ssid;
				params.ssids[params.num_ssids].ssid_len =
					ssid->ssid_len;
				params.num_ssids++;
				if (params.num_ssids + 1 >= max_ssids)
					break;
			}
			ssid = ssid->next;
			if (ssid == start)
				break;
			if (ssid == NULL && max_ssids > 1 &&
			    start != wpa_s->conf->ssid)
				ssid = wpa_s->conf->ssid;
		}

		for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
			if (tssid->disabled)
				continue;
			if ((params.freqs || !freqs_set) && tssid->scan_freq) {
				int_array_concat(&params.freqs,
						 tssid->scan_freq);
			} else {
				os_free(params.freqs);
				params.freqs = NULL;
			}
			freqs_set = 1;
		}
		int_array_sort_unique(params.freqs);
	}

	if (ssid) {
		wpa_s->prev_scan_ssid = ssid;
		if (max_ssids > 1) {
			wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
				"the scan request");
			params.num_ssids++;
		}
		wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for specific "
			"SSID(s)");
	} else {
		wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
		params.num_ssids++;
		wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
			"SSID");
	}

#ifdef CONFIG_P2P
	wpa_s->wps->dev.p2p = 1;
	if (!wps) {
		wps = 1;
		req_type = WPS_REQ_ENROLLEE_INFO;
	}

	if (params.freqs == NULL && wpa_s->p2p_in_provisioning &&
	    wpa_s->go_params) {
		/* Optimize provisioning state scan based on GO information */
		if (wpa_s->p2p_in_provisioning < 5 &&
		    wpa_s->go_params->freq > 0) {
			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
				"preferred frequency %d MHz",
				wpa_s->go_params->freq);
			params.freqs = os_zalloc(2 * sizeof(int));
			if (params.freqs)
				params.freqs[0] = wpa_s->go_params->freq;
		} else if (wpa_s->p2p_in_provisioning < 8 &&
			   wpa_s->go_params->freq_list[0]) {
			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
				"channels");
			int_array_concat(&params.freqs,
					 wpa_s->go_params->freq_list);
			if (params.freqs)
				int_array_sort_unique(params.freqs);
		}
		wpa_s->p2p_in_provisioning++;
	}
#endif /* CONFIG_P2P */

#ifdef CONFIG_WPS
	if (params.freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
		/*
		 * Optimize post-provisioning scan based on channel used
		 * during provisioning.
		 */
		wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
			"that was used during provisioning", wpa_s->wps_freq);
		params.freqs = os_zalloc(2 * sizeof(int));
		if (params.freqs)
			params.freqs[0] = wpa_s->wps_freq;
		wpa_s->after_wps--;
	}

	if (wps) {
		wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
						wpa_s->wps->uuid, req_type,
						0, NULL, wpa_s->wps->config_methods);
		if (wps_ie) {
			params.extra_ies = wpabuf_head(wps_ie);
			params.extra_ies_len = wpabuf_len(wps_ie);
		}
	}
#endif /* CONFIG_WPS */

#ifdef CONFIG_P2P
	if (wps_ie) {
		if (wpabuf_resize(&wps_ie, 100) == 0) {
			wpas_p2p_scan_ie(wpa_s, wps_ie);
			params.extra_ies = wpabuf_head(wps_ie);
			params.extra_ies_len = wpabuf_len(wps_ie);
		}
	}
#endif /* CONFIG_P2P */

	if (params.freqs == NULL && wpa_s->next_scan_freqs) {
		wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
			"generated frequency list");
		params.freqs = wpa_s->next_scan_freqs;
	} else
		os_free(wpa_s->next_scan_freqs);
	wpa_s->next_scan_freqs = NULL;

	params.filter_ssids = wpa_supplicant_build_filter_ssids(
		wpa_s->conf, &params.num_filter_ssids);

	ret = wpa_supplicant_trigger_scan(wpa_s, &params);

	wpabuf_free(wps_ie);
	os_free(params.freqs);
	os_free(params.filter_ssids);

	if (ret) {
		wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
		if (prev_state != wpa_s->wpa_state)
			wpa_supplicant_set_state(wpa_s, prev_state);
		wpa_supplicant_req_scan(wpa_s, 1, 0);
	}
}