| /* |
| * WPA Supplicant - Scanning |
| * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi> |
| * |
| * 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 "utils/eloop.h" |
| #include "common/ieee802_11_defs.h" |
| #include "config.h" |
| #include "wpa_supplicant_i.h" |
| #include "driver_i.h" |
| #include "wps_supplicant.h" |
| #include "p2p_supplicant.h" |
| #include "p2p/p2p.h" |
| #include "hs20_supplicant.h" |
| #include "notify.h" |
| #include "bss.h" |
| #include "scan.h" |
| |
| |
| static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) |
| { |
| struct wpa_ssid *ssid; |
| union wpa_event_data data; |
| |
| ssid = wpa_supplicant_get_ssid(wpa_s); |
| if (ssid == NULL) |
| return; |
| |
| if (wpa_s->current_ssid == NULL) { |
| wpa_s->current_ssid = ssid; |
| if (wpa_s->current_ssid != NULL) |
| wpas_notify_network_changed(wpa_s); |
| } |
| wpa_supplicant_initiate_eapol(wpa_s); |
| wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
| "network - generating associated event"); |
| os_memset(&data, 0, sizeof(data)); |
| wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); |
| } |
| |
| |
| #ifdef CONFIG_WPS |
| static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
| enum wps_request_type *req_type) |
| { |
| struct wpa_ssid *ssid; |
| int wps = 0; |
| |
| for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
| if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
| continue; |
| |
| wps = 1; |
| *req_type = wpas_wps_get_req_type(ssid); |
| if (!ssid->eap.phase1) |
| continue; |
| |
| if (os_strstr(ssid->eap.phase1, "pbc=1")) |
| return 2; |
| } |
| |
| #ifdef CONFIG_P2P |
| if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p && |
| !wpa_s->conf->p2p_disabled) { |
| wpa_s->wps->dev.p2p = 1; |
| if (!wps) { |
| wps = 1; |
| *req_type = WPS_REQ_ENROLLEE_INFO; |
| } |
| } |
| #endif /* CONFIG_P2P */ |
| |
| return wps; |
| } |
| #endif /* CONFIG_WPS */ |
| |
| |
| /** |
| * wpa_supplicant_enabled_networks - Check whether there are enabled networks |
| * @wpa_s: Pointer to wpa_supplicant data |
| * Returns: 0 if no networks are enabled, >0 if networks are enabled |
| * |
| * This function is used to figure out whether any networks (or Interworking |
| * with enabled credentials and auto_interworking) are present in the current |
| * configuration. |
| */ |
| int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s) |
| { |
| struct wpa_ssid *ssid = wpa_s->conf->ssid; |
| int count = 0, disabled = 0; |
| while (ssid) { |
| if (!wpas_network_disabled(wpa_s, ssid)) |
| count++; |
| else |
| disabled++; |
| ssid = ssid->next; |
| } |
| if (wpa_s->conf->cred && wpa_s->conf->interworking && |
| wpa_s->conf->auto_interworking) |
| count++; |
| if (count == 0 && disabled > 0) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled " |
| "networks)", disabled); |
| } |
| return count; |
| } |
| |
| |
| static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, |
| struct wpa_ssid *ssid) |
| { |
| while (ssid) { |
| if (!wpas_network_disabled(wpa_s, ssid)) |
| break; |
| ssid = ssid->next; |
| } |
| |
| /* ap_scan=2 mode - try to associate with each SSID. */ |
| if (ssid == NULL) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
| "end of scan list - go back to beginning"); |
| wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
| wpa_supplicant_req_scan(wpa_s, 0, 0); |
| return; |
| } |
| if (ssid->next) { |
| /* Continue from the next SSID on the next attempt. */ |
| wpa_s->prev_scan_ssid = ssid; |
| } else { |
| /* Start from the beginning of the SSID list. */ |
| wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
| } |
| wpa_supplicant_associate(wpa_s, NULL, ssid); |
| } |
| |
| |
| static int int_array_len(const int *a) |
| { |
| int i; |
| for (i = 0; a && a[i]; i++) |
| ; |
| return i; |
| } |
| |
| |
| static void int_array_concat(int **res, const int *a) |
| { |
| int reslen, alen, i; |
| int *n; |
| |
| reslen = int_array_len(*res); |
| alen = int_array_len(a); |
| |
| n = os_realloc_array(*res, reslen + alen + 1, sizeof(int)); |
| if (n == NULL) { |
| os_free(*res); |
| *res = NULL; |
| return; |
| } |
| for (i = 0; i <= alen; i++) |
| n[reslen + i] = a[i]; |
| *res = n; |
| } |
| |
| |
| static int freq_cmp(const void *a, const void *b) |
| { |
| int _a = *(int *) a; |
| int _b = *(int *) b; |
| |
| if (_a == 0) |
| return 1; |
| if (_b == 0) |
| return -1; |
| return _a - _b; |
| } |
| |
| |
| static void int_array_sort_unique(int *a) |
| { |
| int alen; |
| int i, j; |
| |
| if (a == NULL) |
| return; |
| |
| alen = int_array_len(a); |
| qsort(a, alen, sizeof(int), freq_cmp); |
| |
| i = 0; |
| j = 1; |
| while (a[i] && a[j]) { |
| if (a[i] == a[j]) { |
| j++; |
| continue; |
| } |
| a[++i] = a[j++]; |
| } |
| if (a[i]) |
| i++; |
| a[i] = 0; |
| } |
| |
| |
| /** |
| * wpa_supplicant_trigger_scan - Request driver to start a scan |
| * @wpa_s: Pointer to wpa_supplicant data |
| * @params: Scan parameters |
| * Returns: 0 on success, -1 on failure |
| */ |
| int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
| struct wpa_driver_scan_params *params) |
| { |
| int ret; |
| |
| wpa_supplicant_notify_scanning(wpa_s, 1); |
| |
| ret = wpa_drv_scan(wpa_s, params); |
| if (ret) { |
| wpa_supplicant_notify_scanning(wpa_s, 0); |
| wpas_notify_scan_done(wpa_s, 0); |
| } else { |
| wpa_s->scan_runs++; |
| wpa_s->normal_scans++; |
| } |
| |
| return ret; |
| } |
| |
| |
| static void |
| wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) |
| { |
| struct wpa_supplicant *wpa_s = eloop_ctx; |
| |
| wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); |
| |
| if (wpa_supplicant_req_sched_scan(wpa_s)) |
| wpa_supplicant_req_scan(wpa_s, 0, 0); |
| } |
| |
| |
| static void |
| wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) |
| { |
| struct wpa_supplicant *wpa_s = eloop_ctx; |
| |
| wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); |
| |
| wpa_s->sched_scan_timed_out = 1; |
| wpa_supplicant_cancel_sched_scan(wpa_s); |
| } |
| |
| |
| static int |
| wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, |
| struct wpa_driver_scan_params *params, |
| int interval) |
| { |
| int ret; |
| |
| wpa_supplicant_notify_scanning(wpa_s, 1); |
| ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); |
| if (ret) |
| wpa_supplicant_notify_scanning(wpa_s, 0); |
| else |
| wpa_s->sched_scanning = 1; |
| |
| return ret; |
| } |
| |
| |
| static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) |
| { |
| int ret; |
| |
| ret = wpa_drv_stop_sched_scan(wpa_s); |
| if (ret) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); |
| /* TODO: what to do if stopping fails? */ |
| return -1; |
| } |
| |
| return ret; |
| } |
| |
| |
| static struct wpa_driver_scan_filter * |
| wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) |
| { |
| struct wpa_driver_scan_filter *ssids; |
| struct wpa_ssid *ssid; |
| size_t count; |
| |
| *num_ssids = 0; |
| if (!conf->filter_ssids) |
| return NULL; |
| |
| for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { |
| if (ssid->ssid && ssid->ssid_len) |
| count++; |
| } |
| if (count == 0) |
| return NULL; |
| ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); |
| if (ssids == NULL) |
| return NULL; |
| |
| for (ssid = conf->ssid; ssid; ssid = ssid->next) { |
| if (!ssid->ssid || !ssid->ssid_len) |
| continue; |
| os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); |
| ssids[*num_ssids].ssid_len = ssid->ssid_len; |
| (*num_ssids)++; |
| } |
| |
| return ssids; |
| } |
| |
| |
| static void wpa_supplicant_optimize_freqs( |
| struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) |
| { |
| #ifdef CONFIG_P2P |
| 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(¶ms->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 (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq) |
| { |
| /* Optimize provisioning scan based on already known channel */ |
| wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz", |
| wpa_s->wps_freq); |
| params->freqs = os_zalloc(2 * sizeof(int)); |
| if (params->freqs) |
| params->freqs[0] = wpa_s->wps_freq; |
| wpa_s->known_wps_freq = 0; /* only do this once */ |
| } |
| #endif /* CONFIG_WPS */ |
| } |
| |
| |
| #ifdef CONFIG_INTERWORKING |
| static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s, |
| struct wpabuf *buf) |
| { |
| if (wpa_s->conf->interworking == 0) |
| return; |
| |
| wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); |
| wpabuf_put_u8(buf, 4); |
| wpabuf_put_u8(buf, 0x00); |
| wpabuf_put_u8(buf, 0x00); |
| wpabuf_put_u8(buf, 0x00); |
| wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */ |
| |
| wpabuf_put_u8(buf, WLAN_EID_INTERWORKING); |
| wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 : |
| 1 + ETH_ALEN); |
| wpabuf_put_u8(buf, wpa_s->conf->access_network_type); |
| /* No Venue Info */ |
| if (!is_zero_ether_addr(wpa_s->conf->hessid)) |
| wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN); |
| } |
| #endif /* CONFIG_INTERWORKING */ |
| |
| |
| 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 */ |
| |
| return extra_ie; |
| } |
| |
| |
| #ifdef CONFIG_P2P |
| |
| /* |
| * Check whether there are any enabled networks or credentials that could be |
| * used for a non-P2P connection. |
| */ |
| static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s) |
| { |
| struct wpa_ssid *ssid; |
| |
| for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
| if (wpas_network_disabled(wpa_s, ssid)) |
| continue; |
| if (!ssid->p2p_group) |
| return 1; |
| } |
| |
| if (wpa_s->conf->cred && wpa_s->conf->interworking && |
| wpa_s->conf->auto_interworking) |
| return 1; |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Find the operating frequency of any other virtual interface that is using |
| * the same radio concurrently. |
| */ |
| static int shared_vif_oper_freq(struct wpa_supplicant *wpa_s) |
| { |
| const char *rn, *rn2; |
| struct wpa_supplicant *ifs; |
| u8 bssid[ETH_ALEN]; |
| |
| if (!wpa_s->driver->get_radio_name) |
| return -1; |
| |
| rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv); |
| if (rn == NULL || rn[0] == '\0') |
| return -1; |
| |
| for (ifs = wpa_s->global->ifaces; ifs; ifs = ifs->next) { |
| if (ifs == wpa_s || !ifs->driver->get_radio_name) |
| continue; |
| |
| rn2 = ifs->driver->get_radio_name(ifs->drv_priv); |
| if (!rn2 || os_strcmp(rn, rn2) != 0) |
| continue; |
| |
| if (ifs->current_ssid == NULL || ifs->assoc_freq == 0) |
| continue; |
| |
| if (ifs->current_ssid->mode == WPAS_MODE_AP || |
| ifs->current_ssid->mode == WPAS_MODE_P2P_GO) |
| return ifs->current_ssid->frequency; |
| if (wpa_drv_get_bssid(ifs, bssid) == 0) |
| return ifs->assoc_freq; |
| } |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_P2P */ |
| |
| |
| static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) |
| { |
| struct wpa_supplicant *wpa_s = eloop_ctx; |
| struct wpa_ssid *ssid; |
| enum scan_req_type scan_req = NORMAL_SCAN_REQ; |
| int ret; |
| struct wpabuf *extra_ie = NULL; |
| struct wpa_driver_scan_params params; |
| struct wpa_driver_scan_params *scan_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 == NORMAL_SCAN_REQ) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan"); |
| wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); |
| return; |
| } |
| |
| if (!wpa_supplicant_enabled_networks(wpa_s) && |
| wpa_s->scan_req == NORMAL_SCAN_REQ) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
| wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
| #ifdef CONFIG_P2P |
| wpa_s->sta_scan_pending = 0; |
| #endif /* CONFIG_P2P */ |
| 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; |
| } |
| |
| #ifdef CONFIG_P2P |
| if (wpas_p2p_in_progress(wpa_s)) { |
| if (wpa_s->sta_scan_pending && |
| wpas_p2p_in_progress(wpa_s) == 2 && |
| wpa_s->global->p2p_cb_on_scan_complete) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station " |
| "mode scan during P2P search"); |
| } else { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " |
| "while P2P operation is in progress"); |
| wpa_s->sta_scan_pending = 1; |
| wpa_supplicant_req_scan(wpa_s, 5, 0); |
| return; |
| } |
| } |
| #endif /* CONFIG_P2P */ |
| |
| if (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; |
| } |
| |
| scan_req = wpa_s->scan_req; |
| wpa_s->scan_req = NORMAL_SCAN_REQ; |
| |
| os_memset(¶ms, 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); |
| |
| /* |
| * If autoscan has set its own scanning parameters |
| */ |
| if (wpa_s->autoscan_params != NULL) { |
| scan_params = wpa_s->autoscan_params; |
| goto scan; |
| } |
| |
| if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) { |
| for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
| if (ssid == wpa_s->connect_without_scan) |
| break; |
| } |
| wpa_s->connect_without_scan = NULL; |
| if (ssid) { |
| wpa_printf(MSG_DEBUG, "Start a pre-selected network " |
| "without scan step"); |
| wpa_supplicant_associate(wpa_s, NULL, ssid); |
| return; |
| } |
| } |
| |
| #ifdef CONFIG_P2P |
| if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && |
| wpa_s->go_params) { |
| wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during " |
| "P2P group formation"); |
| params.ssids[0].ssid = wpa_s->go_params->ssid; |
| params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; |
| params.num_ssids = 1; |
| goto ssid_list_set; |
| } |
| #endif /* CONFIG_P2P */ |
| |
| /* 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 != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) { |
| wpa_s->connect_without_scan = NULL; |
| wpa_s->prev_scan_wildcard = 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 (!wpas_network_disabled(wpa_s, ssid) && |
| 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 (wpas_network_disabled(wpa_s, tssid)) |
| continue; |
| if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
| int_array_concat(¶ms.freqs, |
| tssid->scan_freq); |
| } else { |
| os_free(params.freqs); |
| params.freqs = NULL; |
| } |
| freqs_set = 1; |
| } |
| int_array_sort_unique(params.freqs); |
| } |
| |
| if (ssid && max_ssids == 1) { |
| /* |
| * If the driver is limited to 1 SSID at a time interleave |
| * wildcard SSID scans with specific SSID scans to avoid |
| * waiting a long time for a wildcard scan. |
| */ |
| if (!wpa_s->prev_scan_wildcard) { |
| params.ssids[0].ssid = NULL; |
| params.ssids[0].ssid_len = 0; |
| wpa_s->prev_scan_wildcard = 1; |
| wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " |
| "wildcard SSID (Interleave with specific)"); |
| } else { |
| wpa_s->prev_scan_ssid = ssid; |
| wpa_s->prev_scan_wildcard = 0; |
| wpa_dbg(wpa_s, MSG_DEBUG, |
| "Starting AP scan for specific SSID: %s", |
| wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
| } |
| } else if (ssid) { |
| /* max_ssids > 1 */ |
| |
| wpa_s->prev_scan_ssid = ssid; |
| wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " |
| "the scan request"); |
| params.num_ssids++; |
| } 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 |
| ssid_list_set: |
| #endif /* CONFIG_P2P */ |
| |
| wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
| extra_ie = wpa_supplicant_extra_ies(wpa_s); |
| |
| #ifdef CONFIG_HS20 |
| if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 6) == 0) |
| wpas_hs20_add_indication(extra_ie); |
| #endif /* CONFIG_HS20 */ |
| |
| 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, ¶ms.num_filter_ssids); |
| if (extra_ie) { |
| params.extra_ies = wpabuf_head(extra_ie); |
| params.extra_ies_len = wpabuf_len(extra_ie); |
| } |
| |
| #ifdef CONFIG_P2P |
| if (wpa_s->p2p_in_provisioning || |
| (wpa_s->show_group_started && wpa_s->go_params)) { |
| /* |
| * The interface may not yet be in P2P mode, so we have to |
| * explicitly request P2P probe to disable CCK rates. |
| */ |
| params.p2p_probe = 1; |
| } |
| #endif /* CONFIG_P2P */ |
| |
| scan_params = ¶ms; |
| |
| scan: |
| #ifdef CONFIG_P2P |
| /* |
| * If the driver does not support multi-channel concurrency and a |
| * virtual interface that shares the same radio with the wpa_s interface |
| * is operating there may not be need to scan other channels apart from |
| * the current operating channel on the other virtual interface. Filter |
| * out other channels in case we are trying to find a connection for a |
| * station interface when we are not configured to prefer station |
| * connection and a concurrent operation is already in process. |
| */ |
| if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ && |
| !scan_params->freqs && !params.freqs && |
| wpas_is_p2p_prioritized(wpa_s) && |
| !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) && |
| wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE && |
| non_p2p_network_enabled(wpa_s)) { |
| int freq = shared_vif_oper_freq(wpa_s); |
| if (freq > 0) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only the current " |
| "operating channel (%d MHz) since driver does " |
| "not support multi-channel concurrency", freq); |
| params.freqs = os_zalloc(sizeof(int) * 2); |
| if (params.freqs) |
| params.freqs[0] = freq; |
| scan_params->freqs = params.freqs; |
| } |
| } |
| #endif /* CONFIG_P2P */ |
| |
| ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); |
| |
| wpabuf_free(extra_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); |
| /* Restore scan_req since we will try to scan again */ |
| wpa_s->scan_req = scan_req; |
| wpa_supplicant_req_scan(wpa_s, 1, 0); |
| } else { |
| wpa_s->scan_for_connection = 0; |
| } |
| } |
| |
| |
| /** |
| * wpa_supplicant_req_scan - Schedule a scan for neighboring access points |
| * @wpa_s: Pointer to wpa_supplicant data |
| * @sec: Number of seconds after which to scan |
| * @usec: Number of microseconds after which to scan |
| * |
| * This function is used to schedule a scan for neighboring access points after |
| * the specified time. |
| */ |
| void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) |
| { |
| /* If there's at least one network that should be specifically scanned |
| * then don't cancel the scan and reschedule. Some drivers do |
| * background scanning which generates frequent scan results, and that |
| * causes the specific SSID scan to get continually pushed back and |
| * never happen, which causes hidden APs to never get probe-scanned. |
| */ |
| if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && |
| wpa_s->conf->ap_scan == 1) { |
| struct wpa_ssid *ssid = wpa_s->conf->ssid; |
| |
| while (ssid) { |
| if (!wpas_network_disabled(wpa_s, ssid) && |
| ssid->scan_ssid) |
| break; |
| ssid = ssid->next; |
| } |
| if (ssid) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " |
| "ensure that specific SSID scans occur"); |
| return; |
| } |
| } |
| |
| wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
| sec, usec); |
| eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
| eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); |
| } |
| |
| |
| /** |
| * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan |
| * @wpa_s: Pointer to wpa_supplicant data |
| * @sec: Number of seconds after which to scan |
| * @usec: Number of microseconds after which to scan |
| * Returns: 0 on success or -1 otherwise |
| * |
| * This function is used to schedule periodic scans for neighboring |
| * access points after the specified time. |
| */ |
| int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, |
| int sec, int usec) |
| { |
| if (!wpa_s->sched_scan_supported) |
| return -1; |
| |
| eloop_register_timeout(sec, usec, |
| wpa_supplicant_delayed_sched_scan_timeout, |
| wpa_s, NULL); |
| |
| return 0; |
| } |
| |
| |
| /** |
| * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan |
| * @wpa_s: Pointer to wpa_supplicant data |
| * Returns: 0 is sched_scan was started or -1 otherwise |
| * |
| * This function is used to schedule periodic scans for neighboring |
| * access points repeating the scan continuously. |
| */ |
| int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) |
| { |
| struct wpa_driver_scan_params params; |
| struct wpa_driver_scan_params *scan_params; |
| enum wpa_states prev_state; |
| struct wpa_ssid *ssid = NULL; |
| struct wpabuf *extra_ie = NULL; |
| int ret; |
| unsigned int max_sched_scan_ssids; |
| int wildcard = 0; |
| int need_ssids; |
| |
| if (!wpa_s->sched_scan_supported) |
| return -1; |
| |
| if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) |
| max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; |
| else |
| max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; |
| if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) |
| return -1; |
| |
| if (wpa_s->sched_scanning) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); |
| return 0; |
| } |
| |
| need_ssids = 0; |
| for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
| if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) { |
| /* Use wildcard SSID to find this network */ |
| wildcard = 1; |
| } else if (!wpas_network_disabled(wpa_s, ssid) && |
| ssid->ssid_len) |
| need_ssids++; |
| |
| #ifdef CONFIG_WPS |
| if (!wpas_network_disabled(wpa_s, ssid) && |
| ssid->key_mgmt == WPA_KEY_MGMT_WPS) { |
| /* |
| * Normal scan is more reliable and faster for WPS |
| * operations and since these are for short periods of |
| * time, the benefit of trying to use sched_scan would |
| * be limited. |
| */ |
| wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " |
| "sched_scan for WPS"); |
| return -1; |
| } |
| #endif /* CONFIG_WPS */ |
| } |
| if (wildcard) |
| need_ssids++; |
| |
| if (wpa_s->normal_scans < 3 && |
| (need_ssids <= wpa_s->max_scan_ssids || |
| wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { |
| /* |
| * When normal scan can speed up operations, use that for the |
| * first operations before starting the sched_scan to allow |
| * user space sleep more. We do this only if the normal scan |
| * has functionality that is suitable for this or if the |
| * sched_scan does not have better support for multiple SSIDs. |
| */ |
| wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " |
| "sched_scan for initial scans (normal_scans=%d)", |
| wpa_s->normal_scans); |
| return -1; |
| } |
| |
| os_memset(¶ms, 0, sizeof(params)); |
| |
| /* If we can't allocate space for the filters, we just don't filter */ |
| params.filter_ssids = os_zalloc(wpa_s->max_match_sets * |
| sizeof(struct wpa_driver_scan_filter)); |
| |
| 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); |
| |
| if (wpa_s->autoscan_params != NULL) { |
| scan_params = wpa_s->autoscan_params; |
| goto scan; |
| } |
| |
| /* Find the starting point from which to continue scanning */ |
| ssid = wpa_s->conf->ssid; |
| if (wpa_s->prev_sched_ssid) { |
| while (ssid) { |
| if (ssid == wpa_s->prev_sched_ssid) { |
| ssid = ssid->next; |
| break; |
| } |
| ssid = ssid->next; |
| } |
| } |
| |
| if (!ssid || !wpa_s->prev_sched_ssid) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); |
| |
| if (wpa_s->sched_scan_interval == 0) |
| wpa_s->sched_scan_interval = 10; |
| wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; |
| wpa_s->first_sched_scan = 1; |
| ssid = wpa_s->conf->ssid; |
| wpa_s->prev_sched_ssid = ssid; |
| } |
| |
| if (wildcard) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); |
| params.num_ssids++; |
| } |
| |
| while (ssid) { |
| if (wpas_network_disabled(wpa_s, ssid)) |
| goto next; |
| |
| if (params.num_filter_ssids < wpa_s->max_match_sets && |
| params.filter_ssids && ssid->ssid && ssid->ssid_len) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", |
| wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
| os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, |
| ssid->ssid, ssid->ssid_len); |
| params.filter_ssids[params.num_filter_ssids].ssid_len = |
| ssid->ssid_len; |
| params.num_filter_ssids++; |
| } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) |
| { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " |
| "filter for sched_scan - drop filter"); |
| os_free(params.filter_ssids); |
| params.filter_ssids = NULL; |
| params.num_filter_ssids = 0; |
| } |
| |
| if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { |
| if (params.num_ssids == max_sched_scan_ssids) |
| break; /* only room for broadcast SSID */ |
| wpa_dbg(wpa_s, MSG_DEBUG, |
| "add to active scan ssid: %s", |
| wpa_ssid_txt(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 >= max_sched_scan_ssids) { |
| wpa_s->prev_sched_ssid = ssid; |
| do { |
| ssid = ssid->next; |
| } while (ssid && |
| (wpas_network_disabled(wpa_s, ssid) || |
| !ssid->scan_ssid)); |
| break; |
| } |
| } |
| |
| next: |
| wpa_s->prev_sched_ssid = ssid; |
| ssid = ssid->next; |
| } |
| |
| if (params.num_filter_ssids == 0) { |
| os_free(params.filter_ssids); |
| params.filter_ssids = NULL; |
| } |
| |
| extra_ie = wpa_supplicant_extra_ies(wpa_s); |
| if (extra_ie) { |
| params.extra_ies = wpabuf_head(extra_ie); |
| params.extra_ies_len = wpabuf_len(extra_ie); |
| } |
| |
| scan_params = ¶ms; |
| |
| scan: |
| if (ssid || !wpa_s->first_sched_scan) { |
| wpa_dbg(wpa_s, MSG_DEBUG, |
| "Starting sched scan: interval %d timeout %d", |
| wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); |
| } else { |
| wpa_dbg(wpa_s, MSG_DEBUG, |
| "Starting sched scan: interval %d (no timeout)", |
| wpa_s->sched_scan_interval); |
| } |
| |
| ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params, |
| wpa_s->sched_scan_interval); |
| wpabuf_free(extra_ie); |
| os_free(params.filter_ssids); |
| if (ret) { |
| wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); |
| if (prev_state != wpa_s->wpa_state) |
| wpa_supplicant_set_state(wpa_s, prev_state); |
| return ret; |
| } |
| |
| /* If we have more SSIDs to scan, add a timeout so we scan them too */ |
| if (ssid || !wpa_s->first_sched_scan) { |
| wpa_s->sched_scan_timed_out = 0; |
| eloop_register_timeout(wpa_s->sched_scan_timeout, 0, |
| wpa_supplicant_sched_scan_timeout, |
| wpa_s, NULL); |
| wpa_s->first_sched_scan = 0; |
| wpa_s->sched_scan_timeout /= 2; |
| wpa_s->sched_scan_interval *= 2; |
| } |
| |
| return 0; |
| } |
| |
| |
| /** |
| * wpa_supplicant_cancel_scan - Cancel a scheduled scan request |
| * @wpa_s: Pointer to wpa_supplicant data |
| * |
| * This function is used to cancel a scan request scheduled with |
| * wpa_supplicant_req_scan(). |
| */ |
| void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) |
| { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
| eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
| wpa_supplicant_notify_scanning(wpa_s, 0); |
| } |
| |
| |
| /** |
| * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans |
| * @wpa_s: Pointer to wpa_supplicant data |
| * |
| * This function is used to stop a periodic scheduled scan. |
| */ |
| void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) |
| { |
| if (!wpa_s->sched_scanning) |
| return; |
| |
| wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); |
| eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); |
| wpa_supplicant_stop_sched_scan(wpa_s); |
| } |
| |
| |
| /** |
| * wpa_supplicant_notify_scanning - Indicate possible scan state change |
| * @wpa_s: Pointer to wpa_supplicant data |
| * @scanning: Whether scanning is currently in progress |
| * |
| * This function is to generate scanning notifycations. It is called whenever |
| * there may have been a change in scanning (scan started, completed, stopped). |
| * wpas_notify_scanning() is called whenever the scanning state changed from the |
| * previously notified state. |
| */ |
| void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
| int scanning) |
| { |
| if (wpa_s->scanning != scanning) { |
| wpa_s->scanning = scanning; |
| wpas_notify_scanning(wpa_s); |
| } |
| } |
| |
| |
| static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) |
| { |
| int rate = 0; |
| const u8 *ie; |
| int i; |
| |
| ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); |
| for (i = 0; ie && i < ie[1]; i++) { |
| if ((ie[i + 2] & 0x7f) > rate) |
| rate = ie[i + 2] & 0x7f; |
| } |
| |
| ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); |
| for (i = 0; ie && i < ie[1]; i++) { |
| if ((ie[i + 2] & 0x7f) > rate) |
| rate = ie[i + 2] & 0x7f; |
| } |
| |
| return rate; |
| } |
| |
| |
| /** |
| * wpa_scan_get_ie - Fetch a specified information element from a scan result |
| * @res: Scan result entry |
| * @ie: Information element identitifier (WLAN_EID_*) |
| * Returns: Pointer to the information element (id field) or %NULL if not found |
| * |
| * This function returns the first matching information element in the scan |
| * result. |
| */ |
| const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
| { |
| const u8 *end, *pos; |
| |
| pos = (const u8 *) (res + 1); |
| end = pos + res->ie_len; |
| |
| while (pos + 1 < end) { |
| if (pos + 2 + pos[1] > end) |
| break; |
| if (pos[0] == ie) |
| return pos; |
| pos += 2 + pos[1]; |
| } |
| |
| return NULL; |
| } |
| |
| |
| /** |
| * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result |
| * @res: Scan result entry |
| * @vendor_type: Vendor type (four octets starting the IE payload) |
| * Returns: Pointer to the information element (id field) or %NULL if not found |
| * |
| * This function returns the first matching information element in the scan |
| * result. |
| */ |
| const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
| u32 vendor_type) |
| { |
| const u8 *end, *pos; |
| |
| pos = (const u8 *) (res + 1); |
| end = pos + res->ie_len; |
| |
| while (pos + 1 < end) { |
| if (pos + 2 + pos[1] > end) |
| break; |
| if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| vendor_type == WPA_GET_BE32(&pos[2])) |
| return pos; |
| pos += 2 + pos[1]; |
| } |
| |
| return NULL; |
| } |
| |
| |
| /** |
| * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result |
| * @res: Scan result entry |
| * @vendor_type: Vendor type (four octets starting the IE payload) |
| * Returns: Pointer to the information element payload or %NULL if not found |
| * |
| * This function returns concatenated payload of possibly fragmented vendor |
| * specific information elements in the scan result. The caller is responsible |
| * for freeing the returned buffer. |
| */ |
| struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, |
| u32 vendor_type) |
| { |
| struct wpabuf *buf; |
| const u8 *end, *pos; |
| |
| buf = wpabuf_alloc(res->ie_len); |
| if (buf == NULL) |
| return NULL; |
| |
| pos = (const u8 *) (res + 1); |
| end = pos + res->ie_len; |
| |
| while (pos + 1 < end) { |
| if (pos + 2 + pos[1] > end) |
| break; |
| if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| vendor_type == WPA_GET_BE32(&pos[2])) |
| wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); |
| pos += 2 + pos[1]; |
| } |
| |
| if (wpabuf_len(buf) == 0) { |
| wpabuf_free(buf); |
| buf = NULL; |
| } |
| |
| return buf; |
| } |
| |
| |
| /* |
| * Channels with a great SNR can operate at full rate. What is a great SNR? |
| * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general |
| * rule of thumb is that any SNR above 20 is good." This one |
| * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 |
| * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a |
| * conservative value. |
| */ |
| #define GREAT_SNR 30 |
| |
| /* Compare function for sorting scan results. Return >0 if @b is considered |
| * better. */ |
| static int wpa_scan_result_compar(const void *a, const void *b) |
| { |
| #define IS_5GHZ(n) (n > 4000) |
| #define MIN(a,b) a < b ? a : b |
| struct wpa_scan_res **_wa = (void *) a; |
| struct wpa_scan_res **_wb = (void *) b; |
| struct wpa_scan_res *wa = *_wa; |
| struct wpa_scan_res *wb = *_wb; |
| int wpa_a, wpa_b, maxrate_a, maxrate_b; |
| int snr_a, snr_b; |
| |
| /* WPA/WPA2 support preferred */ |
| wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || |
| wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; |
| wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || |
| wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; |
| |
| if (wpa_b && !wpa_a) |
| return 1; |
| if (!wpa_b && wpa_a) |
| return -1; |
| |
| /* privacy support preferred */ |
| if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && |
| (wb->caps & IEEE80211_CAP_PRIVACY)) |
| return 1; |
| if ((wa->caps & IEEE80211_CAP_PRIVACY) && |
| (wb->caps & IEEE80211_CAP_PRIVACY) == 0) |
| return -1; |
| |
| if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && |
| !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { |
| snr_a = MIN(wa->level - wa->noise, GREAT_SNR); |
| snr_b = MIN(wb->level - wb->noise, GREAT_SNR); |
| } else { |
| /* Not suitable information to calculate SNR, so use level */ |
| snr_a = wa->level; |
| snr_b = wb->level; |
| } |
| |
| /* best/max rate preferred if SNR close enough */ |
| if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || |
| (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { |
| maxrate_a = wpa_scan_get_max_rate(wa); |
| maxrate_b = wpa_scan_get_max_rate(wb); |
| if (maxrate_a != maxrate_b) |
| return maxrate_b - maxrate_a; |
| if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) |
| return IS_5GHZ(wa->freq) ? -1 : 1; |
| } |
| |
| /* use freq for channel preference */ |
| |
| /* all things being equal, use SNR; if SNRs are |
| * identical, use quality values since some drivers may only report |
| * that value and leave the signal level zero */ |
| if (snr_b == snr_a) |
| return wb->qual - wa->qual; |
| return snr_b - snr_a; |
| #undef MIN |
| #undef IS_5GHZ |
| } |
| |
| |
| #ifdef CONFIG_WPS |
| /* Compare function for sorting scan results when searching a WPS AP for |
| * provisioning. Return >0 if @b is considered better. */ |
| static int wpa_scan_result_wps_compar(const void *a, const void *b) |
| { |
| struct wpa_scan_res **_wa = (void *) a; |
| struct wpa_scan_res **_wb = (void *) b; |
| struct wpa_scan_res *wa = *_wa; |
| struct wpa_scan_res *wb = *_wb; |
| int uses_wps_a, uses_wps_b; |
| struct wpabuf *wps_a, *wps_b; |
| int res; |
| |
| /* Optimization - check WPS IE existence before allocated memory and |
| * doing full reassembly. */ |
| uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; |
| uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; |
| if (uses_wps_a && !uses_wps_b) |
| return -1; |
| if (!uses_wps_a && uses_wps_b) |
| return 1; |
| |
| if (uses_wps_a && uses_wps_b) { |
| wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); |
| wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); |
| res = wps_ap_priority_compar(wps_a, wps_b); |
| wpabuf_free(wps_a); |
| wpabuf_free(wps_b); |
| if (res) |
| return res; |
| } |
| |
| /* |
| * Do not use current AP security policy as a sorting criteria during |
| * WPS provisioning step since the AP may get reconfigured at the |
| * completion of provisioning. |
| */ |
| |
| /* all things being equal, use signal level; if signal levels are |
| * identical, use quality values since some drivers may only report |
| * that value and leave the signal level zero */ |
| if (wb->level == wa->level) |
| return wb->qual - wa->qual; |
| return wb->level - wa->level; |
| } |
| #endif /* CONFIG_WPS */ |
| |
| |
| static void dump_scan_res(struct wpa_scan_results *scan_res) |
| { |
| #ifndef CONFIG_NO_STDOUT_DEBUG |
| size_t i; |
| |
| if (scan_res->res == NULL || scan_res->num == 0) |
| return; |
| |
| wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); |
| |
| for (i = 0; i < scan_res->num; i++) { |
| struct wpa_scan_res *r = scan_res->res[i]; |
| u8 *pos; |
| if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) |
| == WPA_SCAN_LEVEL_DBM) { |
| int snr = r->level - r->noise; |
| wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " |
| "noise=%d level=%d snr=%d%s flags=0x%x", |
| MAC2STR(r->bssid), r->freq, r->qual, |
| r->noise, r->level, snr, |
| snr >= GREAT_SNR ? "*" : "", r->flags); |
| } else { |
| wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " |
| "noise=%d level=%d flags=0x%x", |
| MAC2STR(r->bssid), r->freq, r->qual, |
| r->noise, r->level, r->flags); |
| } |
| pos = (u8 *) (r + 1); |
| if (r->ie_len) |
| wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len); |
| pos += r->ie_len; |
| if (r->beacon_ie_len) |
| wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs", |
| pos, r->beacon_ie_len); |
| } |
| #endif /* CONFIG_NO_STDOUT_DEBUG */ |
| } |
| |
| |
| /** |
| * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed |
| * @wpa_s: Pointer to wpa_supplicant data |
| * @bssid: BSSID to check |
| * Returns: 0 if the BSSID is filtered or 1 if not |
| * |
| * This function is used to filter out specific BSSIDs from scan reslts mainly |
| * for testing purposes (SET bssid_filter ctrl_iface command). |
| */ |
| int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, |
| const u8 *bssid) |
| { |
| size_t i; |
| |
| if (wpa_s->bssid_filter == NULL) |
| return 1; |
| |
| for (i = 0; i < wpa_s->bssid_filter_count; i++) { |
| if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, |
| ETH_ALEN) == 0) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| |
| static void filter_scan_res(struct wpa_supplicant *wpa_s, |
| struct wpa_scan_results *res) |
| { |
| size_t i, j; |
| |
| if (wpa_s->bssid_filter == NULL) |
| return; |
| |
| for (i = 0, j = 0; i < res->num; i++) { |
| if (wpa_supplicant_filter_bssid_match(wpa_s, |
| res->res[i]->bssid)) { |
| res->res[j++] = res->res[i]; |
| } else { |
| os_free(res->res[i]); |
| res->res[i] = NULL; |
| } |
| } |
| |
| if (res->num != j) { |
| wpa_printf(MSG_DEBUG, "Filtered out %d scan results", |
| (int) (res->num - j)); |
| res->num = j; |
| } |
| } |
| |
| |
| /** |
| * wpa_supplicant_get_scan_results - Get scan results |
| * @wpa_s: Pointer to wpa_supplicant data |
| * @info: Information about what was scanned or %NULL if not available |
| * @new_scan: Whether a new scan was performed |
| * Returns: Scan results, %NULL on failure |
| * |
| * This function request the current scan results from the driver and updates |
| * the local BSS list wpa_s->bss. The caller is responsible for freeing the |
| * results with wpa_scan_results_free(). |
| */ |
| struct wpa_scan_results * |
| wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, |
| struct scan_info *info, int new_scan) |
| { |
| struct wpa_scan_results *scan_res; |
| size_t i; |
| int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
| |
| scan_res = wpa_drv_get_scan_results2(wpa_s); |
| if (scan_res == NULL) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
| return NULL; |
| } |
| filter_scan_res(wpa_s, scan_res); |
| |
| #ifdef CONFIG_WPS |
| if (wpas_wps_in_progress(wpa_s)) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
| "provisioning rules"); |
| compar = wpa_scan_result_wps_compar; |
| } |
| #endif /* CONFIG_WPS */ |
| |
| qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
| compar); |
| dump_scan_res(scan_res); |
| |
| wpa_bss_update_start(wpa_s); |
| for (i = 0; i < scan_res->num; i++) |
| wpa_bss_update_scan_res(wpa_s, scan_res->res[i]); |
| wpa_bss_update_end(wpa_s, info, new_scan); |
| |
| return scan_res; |
| } |
| |
| |
| /** |
| * wpa_supplicant_update_scan_results - Update scan results from the driver |
| * @wpa_s: Pointer to wpa_supplicant data |
| * Returns: 0 on success, -1 on failure |
| * |
| * This function updates the BSS table within wpa_supplicant based on the |
| * currently available scan results from the driver without requesting a new |
| * scan. This is used in cases where the driver indicates an association |
| * (including roaming within ESS) and wpa_supplicant does not yet have the |
| * needed information to complete the connection (e.g., to perform validation |
| * steps in 4-way handshake). |
| */ |
| int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) |
| { |
| struct wpa_scan_results *scan_res; |
| scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); |
| if (scan_res == NULL) |
| return -1; |
| wpa_scan_results_free(scan_res); |
| |
| return 0; |
| } |