| /* |
| * WPA Supplicant - Scanning |
| * Copyright (c) 2003-2014, 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 "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; |
| 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; |
| |
| 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"); |
| 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); |
| 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 == NULL) |
| return -1; |
| |
| if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0) |
| { |
| wpa_scan_free_params(ctx); |
| 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); |
| } |
| |
| |
| 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; |
| } |
| |
| |
| 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) |
| { |
| if (wpa_s->conf->interworking == 0) |
| return; |
| |
| wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); |
| wpabuf_put_u8(buf, 6); |
| 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, 0x00); |
| #ifdef CONFIG_HS20 |
| wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */ |
| #else /* CONFIG_HS20 */ |
| wpabuf_put_u8(buf, 0x00); |
| #endif /* CONFIG_HS20 */ |
| |
| 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 */ |
| |
| 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 */ |
| |
| 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 struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes, |
| u16 num_modes, |
| enum hostapd_hw_mode mode) |
| { |
| u16 i; |
| |
| for (i = 0; i < num_modes; i++) { |
| if (modes[i].mode == mode) |
| return &modes[i]; |
| } |
| |
| return NULL; |
| } |
| |
| |
| 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 (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 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; |
| |
| if (wpa_s->pno || wpa_s->pno_sched_pending) { |
| wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress"); |
| return; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| #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 && |
| 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 == NULL) { |
| wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed"); |
| return; |
| } |
| 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"); |
| } |
| #ifdef CONFIG_P2P |
| ssid_list_set: |
| #endif /* CONFIG_P2P */ |
| |
| 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) { |
| 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; |
| } |
| } |
| |
| 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 */ |
| } |
| } |
| |
| |
| 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; |
| } |
| |
| |
| /** |
| * 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_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"); |
| if (wpa_s->conf->sched_scan_interval) |
| wpa_s->sched_scan_interval = |
| wpa_s->conf->sched_scan_interval; |
| 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); |
| } |
| |
| 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: |
| 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); |
| } |
| |
| wpa_setband_scan_freqs(wpa_s, scan_params); |
| |
| if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) { |
| 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; |
| } |
| } |
| |
| 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; |
| if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) { |
| wpa_s->sched_scan_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; |
| |
| 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_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 (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 |
| |
| #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(wa->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; |
| } |
| |
| |
| 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; |
| } |
| } |
| |
| |
| /* |
| * Noise floor values to use when we have signal strength |
| * measurements, but no noise floor measurments. These values were |
| * measured in an office environment with many APs. |
| */ |
| #define DEFAULT_NOISE_FLOOR_2GHZ (-89) |
| #define DEFAULT_NOISE_FLOOR_5GHZ (-92) |
| |
| static 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 */ |
| } |
| |
| |
| static 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 */ |
| |
| 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], |
| &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); |
| } |
| } |
| |
| |
| 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; |
| |
| 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; |
| } |
| } |
| 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); |
| |
| /* |
| * Note: params->mac_addr_mask points to same memory allocation and |
| * must not be freed separately. |
| */ |
| os_free((u8 *) params->mac_addr); |
| |
| os_free(params); |
| } |
| |
| |
| int wpas_start_pno(struct wpa_supplicant *wpa_s) |
| { |
| int ret, interval, prio; |
| size_t i, num_ssid, num_match_ssid; |
| struct wpa_ssid *ssid; |
| struct wpa_driver_scan_params params; |
| |
| if (!wpa_s->sched_scan_supported) |
| 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; |
| } |
| } |
| |
| 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 > WPAS_MAX_SCAN_SSIDS) { |
| wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from " |
| "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid); |
| num_ssid = WPAS_MAX_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; |
| |
| interval = wpa_s->conf->sched_scan_interval ? |
| wpa_s->conf->sched_scan_interval : 10; |
| |
| 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) { |
| 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; |
| } |
| } |
| |
| ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms, interval); |
| 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->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; |
| } |