/* * WPA Supplicant - Scanning * Copyright (c) 2003-2014, Jouni Malinen * * 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 "common/wpa_ctrl.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" #include "mesh.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; 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 && 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; if (wpa_s->p2p_mgmt) return 0; /* no normal network profiles on p2p_mgmt interface */ 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 void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit) { struct wpa_supplicant *wpa_s = work->wpa_s; struct wpa_driver_scan_params *params = work->ctx; int ret; if (deinit) { if (!work->started) { wpa_scan_free_params(params); return; } wpa_supplicant_notify_scanning(wpa_s, 0); wpas_notify_scan_done(wpa_s, 0); wpa_s->scan_work = NULL; return; } if (wpas_update_random_addr_disassoc(wpa_s) < 0) { wpa_msg(wpa_s, MSG_INFO, "Failed to assign random MAC address for a scan"); wpa_scan_free_params(params); wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1"); radio_work_done(work); return; } wpa_supplicant_notify_scanning(wpa_s, 1); if (wpa_s->clear_driver_scan_cache) { wpa_printf(MSG_DEBUG, "Request driver to clear scan cache due to local BSS flush"); params->only_new_results = 1; } ret = wpa_drv_scan(wpa_s, params); /* * Store the obtained vendor scan cookie (if any) in wpa_s context. * The current design is to allow only one scan request on each * interface, hence having this scan cookie stored in wpa_s context is * fine for now. * * Revisit this logic if concurrent scan operations per interface * is supported. */ if (ret == 0) wpa_s->curr_scan_cookie = params->scan_cookie; wpa_scan_free_params(params); work->ctx = NULL; if (ret) { int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ; if (wpa_s->disconnected) retry = 0; wpa_supplicant_notify_scanning(wpa_s, 0); wpas_notify_scan_done(wpa_s, 0); if (wpa_s->wpa_state == WPA_SCANNING) wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state); wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s", ret, retry ? " retry=1" : ""); radio_work_done(work); if (retry) { /* Restore scan_req since we will try to scan again */ wpa_s->scan_req = wpa_s->last_scan_req; wpa_supplicant_req_scan(wpa_s, 1, 0); } return; } os_get_reltime(&wpa_s->scan_trigger_time); wpa_s->scan_runs++; wpa_s->normal_scans++; wpa_s->own_scan_requested = 1; wpa_s->clear_driver_scan_cache = 0; wpa_s->scan_work = work; } /** * 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) { struct wpa_driver_scan_params *ctx; if (wpa_s->scan_work) { wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending"); return -1; } ctx = wpa_scan_clone_params(params); if (!ctx || radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0) { wpa_scan_free_params(ctx); wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1"); return -1; } return 0; } 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 ret; wpa_supplicant_notify_scanning(wpa_s, 1); ret = wpa_drv_sched_scan(wpa_s, params); 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_calloc(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_calloc(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++; } if (params->freqs == NULL && wpa_s->p2p_in_invitation) { /* * Optimize scan based on GO information during persistent * group reinvocation */ if (wpa_s->p2p_in_invitation < 5 && wpa_s->p2p_invite_go_freq > 0) { wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation", wpa_s->p2p_invite_go_freq); params->freqs = os_calloc(2, sizeof(int)); if (params->freqs) params->freqs[0] = wpa_s->p2p_invite_go_freq; } wpa_s->p2p_in_invitation++; if (wpa_s->p2p_in_invitation > 20) { /* * This should not really happen since the variable is * cleared on group removal, but if it does happen, make * sure we do not get stuck in special invitation scan * mode. */ wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation"); wpa_s->p2p_in_invitation = 0; } } #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_calloc(2, sizeof(int)); if (params->freqs) params->freqs[0] = wpa_s->wps_freq; wpa_s->after_wps--; } else if (wpa_s->after_wps) 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_calloc(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) { 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 */ void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s) { struct wpabuf *default_ies = NULL; u8 ext_capab[18]; int ext_capab_len; enum wpa_driver_if_type type = WPA_IF_STATION; #ifdef CONFIG_P2P if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT) type = WPA_IF_P2P_CLIENT; #endif /* CONFIG_P2P */ wpa_drv_get_ext_capa(wpa_s, type); ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab, sizeof(ext_capab)); if (ext_capab_len > 0 && wpabuf_resize(&default_ies, ext_capab_len) == 0) wpabuf_put_data(default_ies, ext_capab, ext_capab_len); #ifdef CONFIG_MBO /* Send cellular capabilities for potential MBO STAs */ if (wpabuf_resize(&default_ies, 9) == 0) wpas_mbo_scan_ie(wpa_s, default_ies); #endif /* CONFIG_MBO */ if (default_ies) wpa_drv_set_default_scan_ies(wpa_s, wpabuf_head(default_ies), wpabuf_len(default_ies)); wpabuf_free(default_ies); } static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s) { struct wpabuf *extra_ie = NULL; u8 ext_capab[18]; int ext_capab_len; #ifdef CONFIG_WPS int wps = 0; enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO; #endif /* CONFIG_WPS */ #ifdef CONFIG_P2P if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT) wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT); else #endif /* CONFIG_P2P */ wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION); ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab, sizeof(ext_capab)); if (ext_capab_len > 0 && wpabuf_resize(&extra_ie, ext_capab_len) == 0) wpabuf_put_data(extra_ie, ext_capab, ext_capab_len); #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 */ wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie); #endif /* CONFIG_WPS */ #ifdef CONFIG_HS20 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0) wpas_hs20_add_indication(extra_ie, -1); #endif /* CONFIG_HS20 */ #ifdef CONFIG_FST if (wpa_s->fst_ies && wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0) wpabuf_put_buf(extra_ie, wpa_s->fst_ies); #endif /* CONFIG_FST */ #ifdef CONFIG_MBO /* Send cellular capabilities for potential MBO STAs */ if (wpabuf_resize(&extra_ie, 9) == 0) wpas_mbo_scan_ie(wpa_s, extra_ie); #endif /* CONFIG_MBO */ if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) { struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]; if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0) wpabuf_put_buf(extra_ie, buf); } 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; } #endif /* CONFIG_P2P */ static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s, enum hostapd_hw_mode band, struct wpa_driver_scan_params *params) { /* Include only supported channels for the specified band */ struct hostapd_hw_modes *mode; int count, i; mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band); if (mode == NULL) { /* No channels supported in this band - use empty list */ params->freqs = os_zalloc(sizeof(int)); return; } params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); if (params->freqs == NULL) return; for (count = 0, i = 0; i < mode->num_channels; i++) { if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED) continue; params->freqs[count++] = mode->channels[i].freq; } } static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) { if (wpa_s->hw.modes == NULL) return; /* unknown what channels the driver supports */ if (params->freqs) return; /* already using a limited channel set */ if (wpa_s->setband == WPA_SETBAND_5G) wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A, params); else if (wpa_s->setband == WPA_SETBAND_2G) wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G, params); } static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params, size_t max_ssids) { unsigned int i; struct wpa_ssid *ssid; /* * For devices with max_ssids greater than 1, leave the last slot empty * for adding the wildcard scan entry. */ max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids; for (i = 0; i < wpa_s->scan_id_count; i++) { unsigned int j; ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]); if (!ssid || !ssid->scan_ssid) continue; for (j = 0; j < params->num_ssids; j++) { if (params->ssids[j].ssid_len == ssid->ssid_len && params->ssids[j].ssid && os_memcmp(params->ssids[j].ssid, ssid->ssid, ssid->ssid_len) == 0) break; } if (j < params->num_ssids) continue; /* already in the list */ if (params->num_ssids + 1 > max_ssids) { wpa_printf(MSG_DEBUG, "Over max scan SSIDs for manual request"); break; } wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %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++; } wpa_s->scan_id_count = 0; } static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params, size_t max_ssids) { unsigned int i; if (wpa_s->ssids_from_scan_req == NULL || wpa_s->num_ssids_from_scan_req == 0) return 0; if (wpa_s->num_ssids_from_scan_req > max_ssids) { wpa_s->num_ssids_from_scan_req = max_ssids; wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u", (unsigned int) max_ssids); } for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) { params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid; params->ssids[i].ssid_len = wpa_s->ssids_from_scan_req[i].ssid_len; wpa_hexdump_ascii(MSG_DEBUG, "specific SSID", params->ssids[i].ssid, params->ssids[i].ssid_len); } params->num_ssids = wpa_s->num_ssids_from_scan_req; wpa_s->num_ssids_from_scan_req = 0; return 1; } static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) { struct wpa_supplicant *wpa_s = eloop_ctx; struct wpa_ssid *ssid; int ret, p2p_in_prog; struct wpabuf *extra_ie = NULL; struct wpa_driver_scan_params params; struct wpa_driver_scan_params *scan_params; size_t max_ssids; int connect_without_scan = 0; wpa_s->ignore_post_flush_scan_res = 0; 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_s->scanning) { /* * If we are already in scanning state, we shall reschedule the * the incoming scan request. */ wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req"); wpa_supplicant_req_scan(wpa_s, 1, 0); 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); 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; } ssid = NULL; if (wpa_s->scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) { connect_without_scan = 1; for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { if (ssid == wpa_s->connect_without_scan) break; } } p2p_in_prog = wpas_p2p_in_progress(wpa_s); if (p2p_in_prog && p2p_in_prog != 2 && (!ssid || (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) { wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress"); wpa_supplicant_req_scan(wpa_s, 5, 0); return; } /* * Don't cancel the scan based on ongoing PNO; defer it. Some scans are * used for changing modes inside wpa_supplicant (roaming, * auto-reconnect, etc). Discarding the scan might hurt these processes. * The normal use case for PNO is to suspend the host immediately after * starting PNO, so the periodic 100 ms attempts to run the scan do not * normally happen in practice multiple times, i.e., this is simply * restarting scanning once the host is woken up and PNO stopped. */ if (wpa_s->pno || wpa_s->pno_sched_pending) { wpa_dbg(wpa_s, MSG_DEBUG, "Defer scan - PNO is in progress"); wpa_supplicant_req_scan(wpa_s, 0, 100000); return; } 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; } wpa_s->last_scan_req = wpa_s->scan_req; wpa_s->scan_req = NORMAL_SCAN_REQ; if (connect_without_scan) { 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; } } os_memset(¶ms, 0, sizeof(params)); wpa_s->scan_prev_wpa_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 (wpa_s->last_scan_req == MANUAL_SCAN_REQ && wpa_set_ssids_from_scan_req(wpa_s, ¶ms, max_ssids)) { wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command"); goto ssid_list_set; } #ifdef CONFIG_P2P if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && wpa_s->go_params && !wpa_s->conf->passive_scan) { wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)", wpa_s->p2p_in_provisioning, wpa_s->show_group_started); 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; } if (wpa_s->p2p_in_invitation) { if (wpa_s->current_ssid) { wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation"); params.ssids[0].ssid = wpa_s->current_ssid->ssid; params.ssids[0].ssid_len = wpa_s->current_ssid->ssid_len; params.num_ssids = 1; } else { wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation"); } 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 (wpa_s->last_scan_req != MANUAL_SCAN_REQ && #ifdef CONFIG_AP !wpa_s->ap_iface && #endif /* CONFIG_AP */ 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 if (wpa_s->reattach && wpa_s->current_ssid != NULL) { /* * Perform single-channel single-SSID scan for * reassociate-to-same-BSS operation. */ /* Setup SSID */ ssid = wpa_s->current_ssid; wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", ssid->ssid, ssid->ssid_len); params.ssids[0].ssid = ssid->ssid; params.ssids[0].ssid_len = ssid->ssid_len; params.num_ssids = 1; /* * Allocate memory for frequency array, allocate one extra * slot for the zero-terminator. */ params.freqs = os_malloc(sizeof(int) * 2); if (params.freqs) { params.freqs[0] = wpa_s->assoc_freq; params.freqs[1] = 0; } /* * Reset the reattach flag so that we fall back to full scan if * this scan fails. */ wpa_s->reattach = 0; } 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; } if (wpa_s->scan_id_count && wpa_s->last_scan_req == MANUAL_SCAN_REQ) wpa_set_scan_ssids(wpa_s, ¶ms, max_ssids); for (tssid = wpa_s->conf->ssid; wpa_s->last_scan_req != MANUAL_SCAN_REQ && 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 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && wpa_s->manual_scan_passive && params.num_ssids == 0) { wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request"); } else if (wpa_s->conf->passive_scan) { wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on configuration"); } else { wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; params.num_ssids++; wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " "SSID"); } ssid_list_set: wpa_supplicant_optimize_freqs(wpa_s, ¶ms); extra_ie = wpa_supplicant_extra_ies(wpa_s); if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && wpa_s->manual_scan_only_new) { wpa_printf(MSG_DEBUG, "Request driver to clear scan cache due to manual only_new=1 scan"); params.only_new_results = 1; } if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL && wpa_s->manual_scan_freqs) { wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels"); params.freqs = wpa_s->manual_scan_freqs; wpa_s->manual_scan_freqs = NULL; } 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; wpa_setband_scan_freqs(wpa_s, ¶ms); /* See if user specified frequencies. If so, scan only those. */ if (wpa_s->conf->freq_list && !params.freqs) { wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on conf->freq_list"); int_array_concat(¶ms.freqs, wpa_s->conf->freq_list); } /* Use current associated channel? */ if (wpa_s->conf->scan_cur_freq && !params.freqs) { unsigned int num = wpa_s->num_multichan_concurrent; params.freqs = os_calloc(num + 1, sizeof(int)); if (params.freqs) { num = get_shared_radio_freqs(wpa_s, params.freqs, num); if (num > 0) { wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the " "current operating channels since " "scan_cur_freq is enabled"); } else { os_free(params.freqs); params.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->p2p_in_invitation || (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 */ if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) && wpa_s->wpa_state <= WPA_SCANNING) { params.mac_addr_rand = 1; if (wpa_s->mac_addr_scan) { params.mac_addr = wpa_s->mac_addr_scan; params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN; } } if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) { struct wpa_bss *bss; params.bssid = wpa_s->next_scan_bssid; bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid); if (bss && bss->ssid_len && params.num_ssids == 1 && params.ssids[0].ssid_len == 0) { params.ssids[0].ssid = bss->ssid; params.ssids[0].ssid_len = bss->ssid_len; wpa_dbg(wpa_s, MSG_DEBUG, "Scan a previously specified BSSID " MACSTR " and SSID %s", MAC2STR(params.bssid), wpa_ssid_txt(bss->ssid, bss->ssid_len)); } else { wpa_dbg(wpa_s, MSG_DEBUG, "Scan a previously specified BSSID " MACSTR, MAC2STR(params.bssid)); } } 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 && wpa_s->last_scan_req == NORMAL_SCAN_REQ && !scan_params->freqs && !params.freqs && wpas_is_p2p_prioritized(wpa_s) && wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE && non_p2p_network_enabled(wpa_s)) { unsigned int num = wpa_s->num_multichan_concurrent; params.freqs = os_calloc(num + 1, sizeof(int)); if (params.freqs) { num = get_shared_radio_freqs(wpa_s, params.freqs, num); if (num > 0 && num == wpa_s->num_multichan_concurrent) { wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used"); } else { os_free(params.freqs); params.freqs = NULL; } } } #endif /* CONFIG_P2P */ ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs && !wpa_s->manual_scan_freqs) { /* Restore manual_scan_freqs for the next attempt */ wpa_s->manual_scan_freqs = params.freqs; params.freqs = NULL; } 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 (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state) wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state); /* Restore scan_req since we will try to scan again */ wpa_s->scan_req = wpa_s->last_scan_req; wpa_supplicant_req_scan(wpa_s, 1, 0); } else { wpa_s->scan_for_connection = 0; #ifdef CONFIG_INTERWORKING wpa_s->interworking_fast_assoc_tried = 0; #endif /* CONFIG_INTERWORKING */ if (params.bssid) os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN); } } void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec) { struct os_reltime remaining, new_int; int cancelled; cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL, &remaining); new_int.sec = sec; new_int.usec = 0; if (cancelled && os_reltime_before(&remaining, &new_int)) { new_int.sec = remaining.sec; new_int.usec = remaining.usec; } if (cancelled) { eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan, wpa_s, NULL); } wpa_s->scan_interval = sec; } /** * 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) { int res; if (wpa_s->p2p_mgmt) { wpa_dbg(wpa_s, MSG_DEBUG, "Ignore scan request (%d.%06d sec) on p2p_mgmt interface", sec, usec); return; } res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); if (res == 1) { wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec", sec, usec); } else if (res == 0) { wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner", sec, usec); } else { wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec", sec, usec); 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; } static void wpa_scan_set_relative_rssi_params(struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) { if (wpa_s->wpa_state != WPA_COMPLETED || !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SCHED_SCAN_RELATIVE_RSSI) || wpa_s->srp.relative_rssi_set == 0) return; params->relative_rssi_set = 1; params->relative_rssi = wpa_s->srp.relative_rssi; if (wpa_s->srp.relative_adjust_rssi == 0) return; params->relative_adjust_band = wpa_s->srp.relative_adjust_band; params->relative_adjust_rssi = wpa_s->srp.relative_adjust_rssi; } /** * 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; struct sched_scan_plan scan_plan; 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; wpa_s->sched_scan_stop_req = 0; 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_calloc(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"); 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); } if (wpa_s->conf->filter_rssi) params.filter_rssi = wpa_s->conf->filter_rssi; /* See if user specified frequencies. If so, scan only those. */ if (wpa_s->conf->freq_list && !params.freqs) { wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on conf->freq_list"); int_array_concat(¶ms.freqs, wpa_s->conf->freq_list); } scan_params = ¶ms; scan: wpa_s->sched_scan_timed_out = 0; /* * We cannot support multiple scan plans if the scan request includes * too many SSID's, so in this case use only the last scan plan and make * it run infinitely. It will be stopped by the timeout. */ if (wpa_s->sched_scan_plans_num == 1 || (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) { params.sched_scan_plans = wpa_s->sched_scan_plans; params.sched_scan_plans_num = wpa_s->sched_scan_plans_num; } else if (wpa_s->sched_scan_plans_num > 1) { wpa_dbg(wpa_s, MSG_DEBUG, "Too many SSIDs. Default to using single scheduled_scan plan"); params.sched_scan_plans = &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num - 1]; params.sched_scan_plans_num = 1; } else { if (wpa_s->conf->sched_scan_interval) scan_plan.interval = wpa_s->conf->sched_scan_interval; else scan_plan.interval = 10; if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) { wpa_printf(MSG_WARNING, "Scan interval too long(%u), use the maximum allowed(%u)", scan_plan.interval, wpa_s->max_sched_scan_plan_interval); scan_plan.interval = wpa_s->max_sched_scan_plan_interval; } scan_plan.iterations = 0; params.sched_scan_plans = &scan_plan; params.sched_scan_plans_num = 1; } if (ssid || !wpa_s->first_sched_scan) { wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan: interval %u timeout %d", params.sched_scan_plans[0].interval, wpa_s->sched_scan_timeout); } else { wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)"); } wpa_setband_scan_freqs(wpa_s, scan_params); if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) && wpa_s->wpa_state <= WPA_SCANNING) { params.mac_addr_rand = 1; if (wpa_s->mac_addr_sched_scan) { params.mac_addr = wpa_s->mac_addr_sched_scan; params.mac_addr_mask = wpa_s->mac_addr_sched_scan + ETH_ALEN; } } wpa_scan_set_relative_rssi_params(wpa_s, scan_params); ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params); 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; params.sched_scan_plans[0].interval *= 2; if ((unsigned int) wpa_s->sched_scan_timeout < params.sched_scan_plans[0].interval || params.sched_scan_plans[0].interval > wpa_s->max_sched_scan_plan_interval) { params.sched_scan_plans[0].interval = 10; wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; } } /* If there is no more ssids, start next time from the beginning */ if (!ssid) wpa_s->prev_sched_ssid = NULL; 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_cancel_delayed_sched_scan - Stop a delayed scheduled scan * @wpa_s: Pointer to wpa_supplicant data * * This function is used to stop a delayed scheduled scan. */ void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s) { if (!wpa_s->sched_scan_supported) return; wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan"); eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout, wpa_s, NULL); } /** * 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; if (wpa_s->sched_scanning) wpa_s->sched_scan_stop_req = 1; 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) { size_t ie_len = res->ie_len; /* Use the Beacon frame IEs if res->ie_len is not available */ if (!ie_len) ie_len = res->beacon_ie_len; return get_ie((const u8 *) (res + 1), ie_len, ie); } /** * 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 (end - pos > 1) { if (2 + pos[1] > end - pos) 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_beacon - Fetch vendor information 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. * * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only * from Beacon frames instead of either Beacon or Probe Response frames. */ const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res, u32 vendor_type) { const u8 *end, *pos; if (res->beacon_ie_len == 0) return NULL; pos = (const u8 *) (res + 1); pos += res->ie_len; end = pos + res->beacon_ie_len; while (end - pos > 1) { if (2 + pos[1] > end - pos) 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 (end - pos > 1) { if (2 + pos[1] > end - pos) 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. The estimates used in * scan_est_throughput() allow even smaller SNR values for the maximum rates * (21 for 54 Mbps, 22 for VHT80 MCS9, 24 for HT40 and HT20 MCS7). Use 25 as a * somewhat conservative value here. */ #define GREAT_SNR 25 #define IS_5GHZ(n) (n > 4000) /* 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 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; int snr_a, snr_b, snr_a_full, snr_b_full; /* 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) { snr_a_full = wa->snr; snr_a = MIN(wa->snr, GREAT_SNR); snr_b_full = wb->snr; snr_b = MIN(wb->snr, GREAT_SNR); } else { /* Level is not in dBm, so we can't calculate * SNR. Just use raw level (units unknown). */ snr_a = snr_a_full = wa->level; snr_b = snr_b_full = wb->level; } /* if SNR is close, decide by max rate or frequency band */ if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { if (wa->est_throughput != wb->est_throughput) return wb->est_throughput - wa->est_throughput; if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) return IS_5GHZ(wa->freq) ? -1 : 1; } /* 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_full == snr_a_full) return wb->qual - wa->qual; return snr_b_full - snr_a_full; #undef MIN } #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) { int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID); wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u", MAC2STR(r->bssid), r->freq, r->qual, r->noise, noise_valid ? "" : "~", r->level, r->snr, r->snr >= GREAT_SNR ? "*" : "", r->flags, r->age, r->est_throughput); } else { wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " "noise=%d level=%d flags=0x%x age=%u est=%u", MAC2STR(r->bssid), r->freq, r->qual, r->noise, r->level, r->flags, r->age, r->est_throughput); } 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; } 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; } } /* * Noise floor values to use when we have signal strength * measurements, but no noise floor measurements. These values were * measured in an office environment with many APs. */ #define DEFAULT_NOISE_FLOOR_2GHZ (-89) #define DEFAULT_NOISE_FLOOR_5GHZ (-92) void scan_snr(struct wpa_scan_res *res) { if (res->flags & WPA_SCAN_NOISE_INVALID) { res->noise = IS_5GHZ(res->freq) ? DEFAULT_NOISE_FLOOR_5GHZ : DEFAULT_NOISE_FLOOR_2GHZ; } if (res->flags & WPA_SCAN_LEVEL_DBM) { res->snr = res->level - res->noise; } else { /* Level is not in dBm, so we can't calculate * SNR. Just use raw level (units unknown). */ res->snr = res->level; } } static unsigned int max_ht20_rate(int snr) { if (snr < 6) return 6500; /* HT20 MCS0 */ if (snr < 8) return 13000; /* HT20 MCS1 */ if (snr < 13) return 19500; /* HT20 MCS2 */ if (snr < 17) return 26000; /* HT20 MCS3 */ if (snr < 20) return 39000; /* HT20 MCS4 */ if (snr < 23) return 52000; /* HT20 MCS5 */ if (snr < 24) return 58500; /* HT20 MCS6 */ return 65000; /* HT20 MCS7 */ } static unsigned int max_ht40_rate(int snr) { if (snr < 3) return 13500; /* HT40 MCS0 */ if (snr < 6) return 27000; /* HT40 MCS1 */ if (snr < 10) return 40500; /* HT40 MCS2 */ if (snr < 15) return 54000; /* HT40 MCS3 */ if (snr < 17) return 81000; /* HT40 MCS4 */ if (snr < 22) return 108000; /* HT40 MCS5 */ if (snr < 24) return 121500; /* HT40 MCS6 */ return 135000; /* HT40 MCS7 */ } static unsigned int max_vht80_rate(int snr) { if (snr < 1) return 0; if (snr < 2) return 29300; /* VHT80 MCS0 */ if (snr < 5) return 58500; /* VHT80 MCS1 */ if (snr < 9) return 87800; /* VHT80 MCS2 */ if (snr < 11) return 117000; /* VHT80 MCS3 */ if (snr < 15) return 175500; /* VHT80 MCS4 */ if (snr < 16) return 234000; /* VHT80 MCS5 */ if (snr < 18) return 263300; /* VHT80 MCS6 */ if (snr < 20) return 292500; /* VHT80 MCS7 */ if (snr < 22) return 351000; /* VHT80 MCS8 */ return 390000; /* VHT80 MCS9 */ } void scan_est_throughput(struct wpa_supplicant *wpa_s, struct wpa_scan_res *res) { enum local_hw_capab capab = wpa_s->hw_capab; int rate; /* max legacy rate in 500 kb/s units */ const u8 *ie; unsigned int est, tmp; int snr = res->snr; if (res->est_throughput) return; /* Get maximum legacy rate */ rate = wpa_scan_get_max_rate(res); /* Limit based on estimated SNR */ if (rate > 1 * 2 && snr < 1) rate = 1 * 2; else if (rate > 2 * 2 && snr < 4) rate = 2 * 2; else if (rate > 6 * 2 && snr < 5) rate = 6 * 2; else if (rate > 9 * 2 && snr < 6) rate = 9 * 2; else if (rate > 12 * 2 && snr < 7) rate = 12 * 2; else if (rate > 18 * 2 && snr < 10) rate = 18 * 2; else if (rate > 24 * 2 && snr < 11) rate = 24 * 2; else if (rate > 36 * 2 && snr < 15) rate = 36 * 2; else if (rate > 48 * 2 && snr < 19) rate = 48 * 2; else if (rate > 54 * 2 && snr < 21) rate = 54 * 2; est = rate * 500; if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) { ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP); if (ie) { tmp = max_ht20_rate(snr); if (tmp > est) est = tmp; } } if (capab == CAPAB_HT40 || capab == CAPAB_VHT) { ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION); if (ie && ie[1] >= 2 && (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) { tmp = max_ht40_rate(snr); if (tmp > est) est = tmp; } } if (capab == CAPAB_VHT) { /* Use +1 to assume VHT is always faster than HT */ ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP); if (ie) { tmp = max_ht20_rate(snr) + 1; if (tmp > est) est = tmp; ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION); if (ie && ie[1] >= 2 && (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) { tmp = max_ht40_rate(snr) + 1; if (tmp > est) est = tmp; } ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION); if (ie && ie[1] >= 1 && (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) { tmp = max_vht80_rate(snr) + 1; if (tmp > est) est = tmp; } } } /* TODO: channel utilization and AP load (e.g., from AP Beacon) */ res->est_throughput = est; } /** * 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; } if (scan_res->fetch_time.sec == 0) { /* * Make sure we have a valid timestamp if the driver wrapper * does not set this. */ os_get_reltime(&scan_res->fetch_time); } filter_scan_res(wpa_s, scan_res); for (i = 0; i < scan_res->num; i++) { struct wpa_scan_res *scan_res_item = scan_res->res[i]; scan_snr(scan_res_item); scan_est_throughput(wpa_s, scan_res_item); } #ifdef CONFIG_WPS if (wpas_wps_searching(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 */ if (scan_res->res) { qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), compar); } dump_scan_res(scan_res); if (wpa_s->ignore_post_flush_scan_res) { /* FLUSH command aborted an ongoing scan and these are the * results from the aborted scan. Do not process the results to * maintain flushed state. */ wpa_dbg(wpa_s, MSG_DEBUG, "Do not update BSS table based on pending post-FLUSH scan results"); wpa_s->ignore_post_flush_scan_res = 0; return 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], &scan_res->fetch_time); 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; } /** * scan_only_handler - Reports scan results */ void scan_only_handler(struct wpa_supplicant *wpa_s, struct wpa_scan_results *scan_res) { wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received"); if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && wpa_s->manual_scan_use_id && wpa_s->own_scan_running) { wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u", wpa_s->manual_scan_id); wpa_s->manual_scan_use_id = 0; } else { wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); } wpas_notify_scan_results(wpa_s); wpas_notify_scan_done(wpa_s, 1); if (wpa_s->scan_work) { struct wpa_radio_work *work = wpa_s->scan_work; wpa_s->scan_work = NULL; radio_work_done(work); } if (wpa_s->wpa_state == WPA_SCANNING) wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state); } int wpas_scan_scheduled(struct wpa_supplicant *wpa_s) { return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL); } struct wpa_driver_scan_params * wpa_scan_clone_params(const struct wpa_driver_scan_params *src) { struct wpa_driver_scan_params *params; size_t i; u8 *n; params = os_zalloc(sizeof(*params)); if (params == NULL) return NULL; for (i = 0; i < src->num_ssids; i++) { if (src->ssids[i].ssid) { n = os_malloc(src->ssids[i].ssid_len); if (n == NULL) goto failed; os_memcpy(n, src->ssids[i].ssid, src->ssids[i].ssid_len); params->ssids[i].ssid = n; params->ssids[i].ssid_len = src->ssids[i].ssid_len; } } params->num_ssids = src->num_ssids; if (src->extra_ies) { n = os_malloc(src->extra_ies_len); if (n == NULL) goto failed; os_memcpy(n, src->extra_ies, src->extra_ies_len); params->extra_ies = n; params->extra_ies_len = src->extra_ies_len; } if (src->freqs) { int len = int_array_len(src->freqs); params->freqs = os_malloc((len + 1) * sizeof(int)); if (params->freqs == NULL) goto failed; os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int)); } if (src->filter_ssids) { params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) * src->num_filter_ssids); if (params->filter_ssids == NULL) goto failed; os_memcpy(params->filter_ssids, src->filter_ssids, sizeof(*params->filter_ssids) * src->num_filter_ssids); params->num_filter_ssids = src->num_filter_ssids; } params->filter_rssi = src->filter_rssi; params->p2p_probe = src->p2p_probe; params->only_new_results = src->only_new_results; params->low_priority = src->low_priority; params->duration = src->duration; params->duration_mandatory = src->duration_mandatory; if (src->sched_scan_plans_num > 0) { params->sched_scan_plans = os_malloc(sizeof(*src->sched_scan_plans) * src->sched_scan_plans_num); if (!params->sched_scan_plans) goto failed; os_memcpy(params->sched_scan_plans, src->sched_scan_plans, sizeof(*src->sched_scan_plans) * src->sched_scan_plans_num); params->sched_scan_plans_num = src->sched_scan_plans_num; } if (src->mac_addr_rand) { params->mac_addr_rand = src->mac_addr_rand; if (src->mac_addr && src->mac_addr_mask) { u8 *mac_addr; mac_addr = os_malloc(2 * ETH_ALEN); if (!mac_addr) goto failed; os_memcpy(mac_addr, src->mac_addr, ETH_ALEN); os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask, ETH_ALEN); params->mac_addr = mac_addr; params->mac_addr_mask = mac_addr + ETH_ALEN; } } if (src->bssid) { u8 *bssid; bssid = os_malloc(ETH_ALEN); if (!bssid) goto failed; os_memcpy(bssid, src->bssid, ETH_ALEN); params->bssid = bssid; } params->relative_rssi_set = src->relative_rssi_set; params->relative_rssi = src->relative_rssi; params->relative_adjust_band = src->relative_adjust_band; params->relative_adjust_rssi = src->relative_adjust_rssi; return params; failed: wpa_scan_free_params(params); return NULL; } void wpa_scan_free_params(struct wpa_driver_scan_params *params) { size_t i; if (params == NULL) return; for (i = 0; i < params->num_ssids; i++) os_free((u8 *) params->ssids[i].ssid); os_free((u8 *) params->extra_ies); os_free(params->freqs); os_free(params->filter_ssids); os_free(params->sched_scan_plans); /* * Note: params->mac_addr_mask points to same memory allocation and * must not be freed separately. */ os_free((u8 *) params->mac_addr); os_free((u8 *) params->bssid); os_free(params); } int wpas_start_pno(struct wpa_supplicant *wpa_s) { int ret, prio; size_t i, num_ssid, num_match_ssid; struct wpa_ssid *ssid; struct wpa_driver_scan_params params; struct sched_scan_plan scan_plan; unsigned int max_sched_scan_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) return -1; if (wpa_s->pno || wpa_s->pno_sched_pending) return 0; if ((wpa_s->wpa_state > WPA_SCANNING) && (wpa_s->wpa_state < WPA_COMPLETED)) { wpa_printf(MSG_ERROR, "PNO: In assoc process"); return -EAGAIN; } if (wpa_s->wpa_state == WPA_SCANNING) { wpa_supplicant_cancel_scan(wpa_s); if (wpa_s->sched_scanning) { wpa_printf(MSG_DEBUG, "Schedule PNO on completion of " "ongoing sched scan"); wpa_supplicant_cancel_sched_scan(wpa_s); wpa_s->pno_sched_pending = 1; return 0; } } if (wpa_s->sched_scan_stop_req) { wpa_printf(MSG_DEBUG, "Schedule PNO after previous sched scan has stopped"); wpa_s->pno_sched_pending = 1; return 0; } os_memset(¶ms, 0, sizeof(params)); num_ssid = num_match_ssid = 0; ssid = wpa_s->conf->ssid; while (ssid) { if (!wpas_network_disabled(wpa_s, ssid)) { num_match_ssid++; if (ssid->scan_ssid) num_ssid++; } ssid = ssid->next; } if (num_match_ssid == 0) { wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs"); return -1; } if (num_match_ssid > num_ssid) { params.num_ssids++; /* wildcard */ num_ssid++; } if (num_ssid > max_sched_scan_ssids) { wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from " "%u", max_sched_scan_ssids, (unsigned int) num_ssid); num_ssid = max_sched_scan_ssids; } if (num_match_ssid > wpa_s->max_match_sets) { num_match_ssid = wpa_s->max_match_sets; wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match"); } params.filter_ssids = os_calloc(num_match_ssid, sizeof(struct wpa_driver_scan_filter)); if (params.filter_ssids == NULL) return -1; i = 0; prio = 0; ssid = wpa_s->conf->pssid[prio]; while (ssid) { if (!wpas_network_disabled(wpa_s, ssid)) { if (ssid->scan_ssid && params.num_ssids < num_ssid) { params.ssids[params.num_ssids].ssid = ssid->ssid; params.ssids[params.num_ssids].ssid_len = ssid->ssid_len; params.num_ssids++; } os_memcpy(params.filter_ssids[i].ssid, ssid->ssid, ssid->ssid_len); params.filter_ssids[i].ssid_len = ssid->ssid_len; params.num_filter_ssids++; i++; if (i == num_match_ssid) break; } if (ssid->pnext) ssid = ssid->pnext; else if (prio + 1 == wpa_s->conf->num_prio) break; else ssid = wpa_s->conf->pssid[++prio]; } if (wpa_s->conf->filter_rssi) params.filter_rssi = wpa_s->conf->filter_rssi; if (wpa_s->sched_scan_plans_num) { params.sched_scan_plans = wpa_s->sched_scan_plans; params.sched_scan_plans_num = wpa_s->sched_scan_plans_num; } else { /* Set one scan plan that will run infinitely */ if (wpa_s->conf->sched_scan_interval) scan_plan.interval = wpa_s->conf->sched_scan_interval; else scan_plan.interval = 10; scan_plan.iterations = 0; params.sched_scan_plans = &scan_plan; params.sched_scan_plans_num = 1; } if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) { wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels"); params.freqs = wpa_s->manual_sched_scan_freqs; } if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) && wpa_s->wpa_state <= WPA_SCANNING) { params.mac_addr_rand = 1; if (wpa_s->mac_addr_pno) { params.mac_addr = wpa_s->mac_addr_pno; params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN; } } wpa_scan_set_relative_rssi_params(wpa_s, ¶ms); ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms); os_free(params.filter_ssids); if (ret == 0) wpa_s->pno = 1; else wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO"); return ret; } int wpas_stop_pno(struct wpa_supplicant *wpa_s) { int ret = 0; if (!wpa_s->pno) return 0; ret = wpa_supplicant_stop_sched_scan(wpa_s); wpa_s->sched_scan_stop_req = 1; wpa_s->pno = 0; wpa_s->pno_sched_pending = 0; if (wpa_s->wpa_state == WPA_SCANNING) wpa_supplicant_req_scan(wpa_s, 0, 0); return ret; } void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s, unsigned int type) { type &= MAC_ADDR_RAND_ALL; wpa_s->mac_addr_rand_enable &= ~type; if (type & MAC_ADDR_RAND_SCAN) { os_free(wpa_s->mac_addr_scan); wpa_s->mac_addr_scan = NULL; } if (type & MAC_ADDR_RAND_SCHED_SCAN) { os_free(wpa_s->mac_addr_sched_scan); wpa_s->mac_addr_sched_scan = NULL; } if (type & MAC_ADDR_RAND_PNO) { os_free(wpa_s->mac_addr_pno); wpa_s->mac_addr_pno = NULL; } } int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s, unsigned int type, const u8 *addr, const u8 *mask) { u8 *tmp = NULL; wpas_mac_addr_rand_scan_clear(wpa_s, type); if (addr) { tmp = os_malloc(2 * ETH_ALEN); if (!tmp) return -1; os_memcpy(tmp, addr, ETH_ALEN); os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN); } if (type == MAC_ADDR_RAND_SCAN) { wpa_s->mac_addr_scan = tmp; } else if (type == MAC_ADDR_RAND_SCHED_SCAN) { wpa_s->mac_addr_sched_scan = tmp; } else if (type == MAC_ADDR_RAND_PNO) { wpa_s->mac_addr_pno = tmp; } else { wpa_printf(MSG_INFO, "scan: Invalid MAC randomization type=0x%x", type); os_free(tmp); return -1; } wpa_s->mac_addr_rand_enable |= type; return 0; } int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s) { struct wpa_radio_work *work; struct wpa_radio *radio = wpa_s->radio; dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) { if (work->wpa_s != wpa_s || !work->started || (os_strcmp(work->type, "scan") != 0 && os_strcmp(work->type, "p2p-scan") != 0)) continue; wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan"); return wpa_drv_abort_scan(wpa_s, wpa_s->curr_scan_cookie); } wpa_dbg(wpa_s, MSG_DEBUG, "No ongoing scan/p2p-scan found to abort"); return -1; } int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd) { struct sched_scan_plan *scan_plans = NULL; const char *token, *context = NULL; unsigned int num = 0; if (!cmd) return -1; if (!cmd[0]) { wpa_printf(MSG_DEBUG, "Clear sched scan plans"); os_free(wpa_s->sched_scan_plans); wpa_s->sched_scan_plans = NULL; wpa_s->sched_scan_plans_num = 0; return 0; } while ((token = cstr_token(cmd, " ", &context))) { int ret; struct sched_scan_plan *scan_plan, *n; n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans)); if (!n) goto fail; scan_plans = n; scan_plan = &scan_plans[num]; num++; ret = sscanf(token, "%u:%u", &scan_plan->interval, &scan_plan->iterations); if (ret <= 0 || ret > 2 || !scan_plan->interval) { wpa_printf(MSG_ERROR, "Invalid sched scan plan input: %s", token); goto fail; } if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) { wpa_printf(MSG_WARNING, "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)", num, scan_plan->interval, wpa_s->max_sched_scan_plan_interval); scan_plan->interval = wpa_s->max_sched_scan_plan_interval; } if (ret == 1) { scan_plan->iterations = 0; break; } if (!scan_plan->iterations) { wpa_printf(MSG_ERROR, "scan plan %u: Number of iterations cannot be zero", num); goto fail; } if (scan_plan->iterations > wpa_s->max_sched_scan_plan_iterations) { wpa_printf(MSG_WARNING, "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)", num, scan_plan->iterations, wpa_s->max_sched_scan_plan_iterations); scan_plan->iterations = wpa_s->max_sched_scan_plan_iterations; } wpa_printf(MSG_DEBUG, "scan plan %u: interval=%u iterations=%u", num, scan_plan->interval, scan_plan->iterations); } if (!scan_plans) { wpa_printf(MSG_ERROR, "Invalid scan plans entry"); goto fail; } if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) { wpa_printf(MSG_ERROR, "All scan plans but the last must specify a number of iterations"); goto fail; } wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u", num, scan_plans[num - 1].interval); if (num > wpa_s->max_sched_scan_plans) { wpa_printf(MSG_WARNING, "Too many scheduled scan plans (only %u supported)", wpa_s->max_sched_scan_plans); wpa_printf(MSG_WARNING, "Use only the first %u scan plans, and the last one (in infinite loop)", wpa_s->max_sched_scan_plans - 1); os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1], &scan_plans[num - 1], sizeof(*scan_plans)); num = wpa_s->max_sched_scan_plans; } os_free(wpa_s->sched_scan_plans); wpa_s->sched_scan_plans = scan_plans; wpa_s->sched_scan_plans_num = num; return 0; fail: os_free(scan_plans); wpa_printf(MSG_ERROR, "invalid scan plans list"); return -1; } /** * wpas_scan_reset_sched_scan - Reset sched_scan state * @wpa_s: Pointer to wpa_supplicant data * * This function is used to cancel a running scheduled scan and to reset an * internal scan state to continue with a regular scan on the following * wpa_supplicant_req_scan() calls. */ void wpas_scan_reset_sched_scan(struct wpa_supplicant *wpa_s) { wpa_s->normal_scans = 0; if (wpa_s->sched_scanning) { wpa_s->sched_scan_timed_out = 0; wpa_s->prev_sched_ssid = NULL; wpa_supplicant_cancel_sched_scan(wpa_s); } } void wpas_scan_restart_sched_scan(struct wpa_supplicant *wpa_s) { /* simulate timeout to restart the sched scan */ wpa_s->sched_scan_timed_out = 1; wpa_s->prev_sched_ssid = NULL; wpa_supplicant_cancel_sched_scan(wpa_s); }