/
scan.c
2464 lines (2104 loc) · 64.5 KB
/
scan.c
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/*
* 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)
{
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;
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 */
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 */
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 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;
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;
}
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 == 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");
}
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