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path: root/src/drivers/driver_nl80211_scan.c
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Diffstat (limited to 'src/drivers/driver_nl80211_scan.c')
-rw-r--r--src/drivers/driver_nl80211_scan.c775
1 files changed, 775 insertions, 0 deletions
diff --git a/src/drivers/driver_nl80211_scan.c b/src/drivers/driver_nl80211_scan.c
new file mode 100644
index 0000000000000..3911f485f72e4
--- /dev/null
+++ b/src/drivers/driver_nl80211_scan.c
@@ -0,0 +1,775 @@
+/*
+ * Driver interaction with Linux nl80211/cfg80211 - Scanning
+ * Copyright (c) 2002-2014, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2007, Johannes Berg <johannes@sipsolutions.net>
+ * Copyright (c) 2009-2010, Atheros Communications
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+#include <netlink/genl/genl.h>
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "common/ieee802_11_defs.h"
+#include "driver_nl80211.h"
+
+
+static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
+{
+ struct nlattr *tb[NL80211_ATTR_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
+ static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
+ [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
+ [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
+ };
+ struct wpa_scan_results *scan_results = arg;
+ struct wpa_scan_res *scan_res;
+ size_t i;
+
+ nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+
+ if (!tb[NL80211_ATTR_SURVEY_INFO]) {
+ wpa_printf(MSG_DEBUG, "nl80211: Survey data missing");
+ return NL_SKIP;
+ }
+
+ if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
+ tb[NL80211_ATTR_SURVEY_INFO],
+ survey_policy)) {
+ wpa_printf(MSG_DEBUG, "nl80211: Failed to parse nested "
+ "attributes");
+ return NL_SKIP;
+ }
+
+ if (!sinfo[NL80211_SURVEY_INFO_NOISE])
+ return NL_SKIP;
+
+ if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY])
+ return NL_SKIP;
+
+ for (i = 0; i < scan_results->num; ++i) {
+ scan_res = scan_results->res[i];
+ if (!scan_res)
+ continue;
+ if ((int) nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]) !=
+ scan_res->freq)
+ continue;
+ if (!(scan_res->flags & WPA_SCAN_NOISE_INVALID))
+ continue;
+ scan_res->noise = (s8)
+ nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
+ scan_res->flags &= ~WPA_SCAN_NOISE_INVALID;
+ }
+
+ return NL_SKIP;
+}
+
+
+static int nl80211_get_noise_for_scan_results(
+ struct wpa_driver_nl80211_data *drv,
+ struct wpa_scan_results *scan_res)
+{
+ struct nl_msg *msg;
+
+ msg = nl80211_drv_msg(drv, NLM_F_DUMP, NL80211_CMD_GET_SURVEY);
+ return send_and_recv_msgs(drv, msg, get_noise_for_scan_results,
+ scan_res);
+}
+
+
+/**
+ * wpa_driver_nl80211_scan_timeout - Scan timeout to report scan completion
+ * @eloop_ctx: Driver private data
+ * @timeout_ctx: ctx argument given to wpa_driver_nl80211_init()
+ *
+ * This function can be used as registered timeout when starting a scan to
+ * generate a scan completed event if the driver does not report this.
+ */
+void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_driver_nl80211_data *drv = eloop_ctx;
+ if (drv->ap_scan_as_station != NL80211_IFTYPE_UNSPECIFIED) {
+ wpa_driver_nl80211_set_mode(drv->first_bss,
+ drv->ap_scan_as_station);
+ drv->ap_scan_as_station = NL80211_IFTYPE_UNSPECIFIED;
+ }
+ wpa_printf(MSG_DEBUG, "Scan timeout - try to get results");
+ wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
+}
+
+
+static struct nl_msg *
+nl80211_scan_common(struct i802_bss *bss, u8 cmd,
+ struct wpa_driver_scan_params *params)
+{
+ struct wpa_driver_nl80211_data *drv = bss->drv;
+ struct nl_msg *msg;
+ size_t i;
+ u32 scan_flags = 0;
+
+ msg = nl80211_cmd_msg(bss, 0, cmd);
+ if (!msg)
+ return NULL;
+
+ if (params->num_ssids) {
+ struct nlattr *ssids;
+
+ ssids = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
+ if (ssids == NULL)
+ goto fail;
+ for (i = 0; i < params->num_ssids; i++) {
+ wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
+ params->ssids[i].ssid,
+ params->ssids[i].ssid_len);
+ if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
+ params->ssids[i].ssid))
+ goto fail;
+ }
+ nla_nest_end(msg, ssids);
+ }
+
+ if (params->extra_ies) {
+ wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
+ params->extra_ies, params->extra_ies_len);
+ if (nla_put(msg, NL80211_ATTR_IE, params->extra_ies_len,
+ params->extra_ies))
+ goto fail;
+ }
+
+ if (params->freqs) {
+ struct nlattr *freqs;
+ freqs = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
+ if (freqs == NULL)
+ goto fail;
+ for (i = 0; params->freqs[i]; i++) {
+ wpa_printf(MSG_MSGDUMP, "nl80211: Scan frequency %u "
+ "MHz", params->freqs[i]);
+ if (nla_put_u32(msg, i + 1, params->freqs[i]))
+ goto fail;
+ }
+ nla_nest_end(msg, freqs);
+ }
+
+ os_free(drv->filter_ssids);
+ drv->filter_ssids = params->filter_ssids;
+ params->filter_ssids = NULL;
+ drv->num_filter_ssids = params->num_filter_ssids;
+
+ if (params->only_new_results) {
+ wpa_printf(MSG_DEBUG, "nl80211: Add NL80211_SCAN_FLAG_FLUSH");
+ scan_flags |= NL80211_SCAN_FLAG_FLUSH;
+ }
+
+ if (params->low_priority && drv->have_low_prio_scan) {
+ wpa_printf(MSG_DEBUG,
+ "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
+ scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
+ }
+
+ if (params->mac_addr_rand) {
+ wpa_printf(MSG_DEBUG,
+ "nl80211: Add NL80211_SCAN_FLAG_RANDOM_ADDR");
+ scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
+
+ if (params->mac_addr) {
+ wpa_printf(MSG_DEBUG, "nl80211: MAC address: " MACSTR,
+ MAC2STR(params->mac_addr));
+ if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN,
+ params->mac_addr))
+ goto fail;
+ }
+
+ if (params->mac_addr_mask) {
+ wpa_printf(MSG_DEBUG, "nl80211: MAC address mask: "
+ MACSTR, MAC2STR(params->mac_addr_mask));
+ if (nla_put(msg, NL80211_ATTR_MAC_MASK, ETH_ALEN,
+ params->mac_addr_mask))
+ goto fail;
+ }
+ }
+
+ if (scan_flags &&
+ nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags))
+ goto fail;
+
+ return msg;
+
+fail:
+ nlmsg_free(msg);
+ return NULL;
+}
+
+
+/**
+ * wpa_driver_nl80211_scan - Request the driver to initiate scan
+ * @bss: Pointer to private driver data from wpa_driver_nl80211_init()
+ * @params: Scan parameters
+ * Returns: 0 on success, -1 on failure
+ */
+int wpa_driver_nl80211_scan(struct i802_bss *bss,
+ struct wpa_driver_scan_params *params)
+{
+ struct wpa_driver_nl80211_data *drv = bss->drv;
+ int ret = -1, timeout;
+ struct nl_msg *msg = NULL;
+
+ wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: scan request");
+ drv->scan_for_auth = 0;
+
+ msg = nl80211_scan_common(bss, NL80211_CMD_TRIGGER_SCAN, params);
+ if (!msg)
+ return -1;
+
+ if (params->p2p_probe) {
+ struct nlattr *rates;
+
+ wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");
+
+ rates = nla_nest_start(msg, NL80211_ATTR_SCAN_SUPP_RATES);
+ if (rates == NULL)
+ goto fail;
+
+ /*
+ * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
+ * by masking out everything else apart from the OFDM rates 6,
+ * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
+ * rates are left enabled.
+ */
+ if (nla_put(msg, NL80211_BAND_2GHZ, 8,
+ "\x0c\x12\x18\x24\x30\x48\x60\x6c"))
+ goto fail;
+ nla_nest_end(msg, rates);
+
+ if (nla_put_flag(msg, NL80211_ATTR_TX_NO_CCK_RATE))
+ goto fail;
+ }
+
+ ret = send_and_recv_msgs(drv, msg, NULL, NULL);
+ msg = NULL;
+ if (ret) {
+ wpa_printf(MSG_DEBUG, "nl80211: Scan trigger failed: ret=%d "
+ "(%s)", ret, strerror(-ret));
+ if (drv->hostapd && is_ap_interface(drv->nlmode)) {
+ enum nl80211_iftype old_mode = drv->nlmode;
+
+ /*
+ * mac80211 does not allow scan requests in AP mode, so
+ * try to do this in station mode.
+ */
+ if (wpa_driver_nl80211_set_mode(
+ bss, NL80211_IFTYPE_STATION))
+ goto fail;
+
+ if (wpa_driver_nl80211_scan(bss, params)) {
+ wpa_driver_nl80211_set_mode(bss, old_mode);
+ goto fail;
+ }
+
+ /* Restore AP mode when processing scan results */
+ drv->ap_scan_as_station = old_mode;
+ ret = 0;
+ } else
+ goto fail;
+ }
+
+ drv->scan_state = SCAN_REQUESTED;
+ /* Not all drivers generate "scan completed" wireless event, so try to
+ * read results after a timeout. */
+ timeout = 10;
+ if (drv->scan_complete_events) {
+ /*
+ * The driver seems to deliver events to notify when scan is
+ * complete, so use longer timeout to avoid race conditions
+ * with scanning and following association request.
+ */
+ timeout = 30;
+ }
+ wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
+ "seconds", ret, timeout);
+ eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
+ eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout,
+ drv, drv->ctx);
+
+fail:
+ nlmsg_free(msg);
+ return ret;
+}
+
+
+/**
+ * wpa_driver_nl80211_sched_scan - Initiate a scheduled scan
+ * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
+ * @params: Scan parameters
+ * @interval: Interval between scan cycles in milliseconds
+ * Returns: 0 on success, -1 on failure or if not supported
+ */
+int wpa_driver_nl80211_sched_scan(void *priv,
+ struct wpa_driver_scan_params *params,
+ u32 interval)
+{
+ struct i802_bss *bss = priv;
+ struct wpa_driver_nl80211_data *drv = bss->drv;
+ int ret = -1;
+ struct nl_msg *msg;
+ size_t i;
+
+ wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: sched_scan request");
+
+#ifdef ANDROID
+ if (!drv->capa.sched_scan_supported)
+ return android_pno_start(bss, params);
+#endif /* ANDROID */
+
+ msg = nl80211_scan_common(bss, NL80211_CMD_START_SCHED_SCAN, params);
+ if (!msg ||
+ nla_put_u32(msg, NL80211_ATTR_SCHED_SCAN_INTERVAL, interval))
+ goto fail;
+
+ if ((drv->num_filter_ssids &&
+ (int) drv->num_filter_ssids <= drv->capa.max_match_sets) ||
+ params->filter_rssi) {
+ struct nlattr *match_sets;
+ match_sets = nla_nest_start(msg, NL80211_ATTR_SCHED_SCAN_MATCH);
+ if (match_sets == NULL)
+ goto fail;
+
+ for (i = 0; i < drv->num_filter_ssids; i++) {
+ struct nlattr *match_set_ssid;
+ wpa_hexdump_ascii(MSG_MSGDUMP,
+ "nl80211: Sched scan filter SSID",
+ drv->filter_ssids[i].ssid,
+ drv->filter_ssids[i].ssid_len);
+
+ match_set_ssid = nla_nest_start(msg, i + 1);
+ if (match_set_ssid == NULL ||
+ nla_put(msg, NL80211_ATTR_SCHED_SCAN_MATCH_SSID,
+ drv->filter_ssids[i].ssid_len,
+ drv->filter_ssids[i].ssid) ||
+ (params->filter_rssi &&
+ nla_put_u32(msg,
+ NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
+ params->filter_rssi)))
+ goto fail;
+
+ nla_nest_end(msg, match_set_ssid);
+ }
+
+ /*
+ * Due to backward compatibility code, newer kernels treat this
+ * matchset (with only an RSSI filter) as the default for all
+ * other matchsets, unless it's the only one, in which case the
+ * matchset will actually allow all SSIDs above the RSSI.
+ */
+ if (params->filter_rssi) {
+ struct nlattr *match_set_rssi;
+ match_set_rssi = nla_nest_start(msg, 0);
+ if (match_set_rssi == NULL ||
+ nla_put_u32(msg, NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
+ params->filter_rssi))
+ goto fail;
+ wpa_printf(MSG_MSGDUMP,
+ "nl80211: Sched scan RSSI filter %d dBm",
+ params->filter_rssi);
+ nla_nest_end(msg, match_set_rssi);
+ }
+
+ nla_nest_end(msg, match_sets);
+ }
+
+ ret = send_and_recv_msgs(drv, msg, NULL, NULL);
+
+ /* TODO: if we get an error here, we should fall back to normal scan */
+
+ msg = NULL;
+ if (ret) {
+ wpa_printf(MSG_DEBUG, "nl80211: Sched scan start failed: "
+ "ret=%d (%s)", ret, strerror(-ret));
+ goto fail;
+ }
+
+ wpa_printf(MSG_DEBUG, "nl80211: Sched scan requested (ret=%d) - "
+ "scan interval %d msec", ret, interval);
+
+fail:
+ nlmsg_free(msg);
+ return ret;
+}
+
+
+/**
+ * wpa_driver_nl80211_stop_sched_scan - Stop a scheduled scan
+ * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
+ * Returns: 0 on success, -1 on failure or if not supported
+ */
+int wpa_driver_nl80211_stop_sched_scan(void *priv)
+{
+ struct i802_bss *bss = priv;
+ struct wpa_driver_nl80211_data *drv = bss->drv;
+ int ret;
+ struct nl_msg *msg;
+
+#ifdef ANDROID
+ if (!drv->capa.sched_scan_supported)
+ return android_pno_stop(bss);
+#endif /* ANDROID */
+
+ msg = nl80211_drv_msg(drv, 0, NL80211_CMD_STOP_SCHED_SCAN);
+ ret = send_and_recv_msgs(drv, msg, NULL, NULL);
+ if (ret) {
+ wpa_printf(MSG_DEBUG,
+ "nl80211: Sched scan stop failed: ret=%d (%s)",
+ ret, strerror(-ret));
+ } else {
+ wpa_printf(MSG_DEBUG,
+ "nl80211: Sched scan stop sent");
+ }
+
+ return ret;
+}
+
+
+static const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie)
+{
+ const u8 *end, *pos;
+
+ if (ies == NULL)
+ return NULL;
+
+ pos = ies;
+ end = ies + ies_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == ie)
+ return pos;
+ pos += 2 + pos[1];
+ }
+
+ return NULL;
+}
+
+
+static int nl80211_scan_filtered(struct wpa_driver_nl80211_data *drv,
+ const u8 *ie, size_t ie_len)
+{
+ const u8 *ssid;
+ size_t i;
+
+ if (drv->filter_ssids == NULL)
+ return 0;
+
+ ssid = nl80211_get_ie(ie, ie_len, WLAN_EID_SSID);
+ if (ssid == NULL)
+ return 1;
+
+ for (i = 0; i < drv->num_filter_ssids; i++) {
+ if (ssid[1] == drv->filter_ssids[i].ssid_len &&
+ os_memcmp(ssid + 2, drv->filter_ssids[i].ssid, ssid[1]) ==
+ 0)
+ return 0;
+ }
+
+ return 1;
+}
+
+
+int bss_info_handler(struct nl_msg *msg, void *arg)
+{
+ struct nlattr *tb[NL80211_ATTR_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *bss[NL80211_BSS_MAX + 1];
+ static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
+ [NL80211_BSS_BSSID] = { .type = NLA_UNSPEC },
+ [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
+ [NL80211_BSS_TSF] = { .type = NLA_U64 },
+ [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
+ [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
+ [NL80211_BSS_INFORMATION_ELEMENTS] = { .type = NLA_UNSPEC },
+ [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
+ [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
+ [NL80211_BSS_STATUS] = { .type = NLA_U32 },
+ [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
+ [NL80211_BSS_BEACON_IES] = { .type = NLA_UNSPEC },
+ };
+ struct nl80211_bss_info_arg *_arg = arg;
+ struct wpa_scan_results *res = _arg->res;
+ struct wpa_scan_res **tmp;
+ struct wpa_scan_res *r;
+ const u8 *ie, *beacon_ie;
+ size_t ie_len, beacon_ie_len;
+ u8 *pos;
+ size_t i;
+
+ nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+ if (!tb[NL80211_ATTR_BSS])
+ return NL_SKIP;
+ if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
+ bss_policy))
+ return NL_SKIP;
+ if (bss[NL80211_BSS_STATUS]) {
+ enum nl80211_bss_status status;
+ status = nla_get_u32(bss[NL80211_BSS_STATUS]);
+ if (status == NL80211_BSS_STATUS_ASSOCIATED &&
+ bss[NL80211_BSS_FREQUENCY]) {
+ _arg->assoc_freq =
+ nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
+ wpa_printf(MSG_DEBUG, "nl80211: Associated on %u MHz",
+ _arg->assoc_freq);
+ }
+ if (status == NL80211_BSS_STATUS_IBSS_JOINED &&
+ bss[NL80211_BSS_FREQUENCY]) {
+ _arg->ibss_freq =
+ nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
+ wpa_printf(MSG_DEBUG, "nl80211: IBSS-joined on %u MHz",
+ _arg->ibss_freq);
+ }
+ if (status == NL80211_BSS_STATUS_ASSOCIATED &&
+ bss[NL80211_BSS_BSSID]) {
+ os_memcpy(_arg->assoc_bssid,
+ nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
+ wpa_printf(MSG_DEBUG, "nl80211: Associated with "
+ MACSTR, MAC2STR(_arg->assoc_bssid));
+ }
+ }
+ if (!res)
+ return NL_SKIP;
+ if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
+ ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
+ ie_len = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
+ } else {
+ ie = NULL;
+ ie_len = 0;
+ }
+ if (bss[NL80211_BSS_BEACON_IES]) {
+ beacon_ie = nla_data(bss[NL80211_BSS_BEACON_IES]);
+ beacon_ie_len = nla_len(bss[NL80211_BSS_BEACON_IES]);
+ } else {
+ beacon_ie = NULL;
+ beacon_ie_len = 0;
+ }
+
+ if (nl80211_scan_filtered(_arg->drv, ie ? ie : beacon_ie,
+ ie ? ie_len : beacon_ie_len))
+ return NL_SKIP;
+
+ r = os_zalloc(sizeof(*r) + ie_len + beacon_ie_len);
+ if (r == NULL)
+ return NL_SKIP;
+ if (bss[NL80211_BSS_BSSID])
+ os_memcpy(r->bssid, nla_data(bss[NL80211_BSS_BSSID]),
+ ETH_ALEN);
+ if (bss[NL80211_BSS_FREQUENCY])
+ r->freq = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
+ if (bss[NL80211_BSS_BEACON_INTERVAL])
+ r->beacon_int = nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]);
+ if (bss[NL80211_BSS_CAPABILITY])
+ r->caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
+ r->flags |= WPA_SCAN_NOISE_INVALID;
+ if (bss[NL80211_BSS_SIGNAL_MBM]) {
+ r->level = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
+ r->level /= 100; /* mBm to dBm */
+ r->flags |= WPA_SCAN_LEVEL_DBM | WPA_SCAN_QUAL_INVALID;
+ } else if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
+ r->level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
+ r->flags |= WPA_SCAN_QUAL_INVALID;
+ } else
+ r->flags |= WPA_SCAN_LEVEL_INVALID | WPA_SCAN_QUAL_INVALID;
+ if (bss[NL80211_BSS_TSF])
+ r->tsf = nla_get_u64(bss[NL80211_BSS_TSF]);
+ if (bss[NL80211_BSS_SEEN_MS_AGO])
+ r->age = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
+ r->ie_len = ie_len;
+ pos = (u8 *) (r + 1);
+ if (ie) {
+ os_memcpy(pos, ie, ie_len);
+ pos += ie_len;
+ }
+ r->beacon_ie_len = beacon_ie_len;
+ if (beacon_ie)
+ os_memcpy(pos, beacon_ie, beacon_ie_len);
+
+ if (bss[NL80211_BSS_STATUS]) {
+ enum nl80211_bss_status status;
+ status = nla_get_u32(bss[NL80211_BSS_STATUS]);
+ switch (status) {
+ case NL80211_BSS_STATUS_ASSOCIATED:
+ r->flags |= WPA_SCAN_ASSOCIATED;
+ break;
+ default:
+ break;
+ }
+ }
+
+ /*
+ * cfg80211 maintains separate BSS table entries for APs if the same
+ * BSSID,SSID pair is seen on multiple channels. wpa_supplicant does
+ * not use frequency as a separate key in the BSS table, so filter out
+ * duplicated entries. Prefer associated BSS entry in such a case in
+ * order to get the correct frequency into the BSS table. Similarly,
+ * prefer newer entries over older.
+ */
+ for (i = 0; i < res->num; i++) {
+ const u8 *s1, *s2;
+ if (os_memcmp(res->res[i]->bssid, r->bssid, ETH_ALEN) != 0)
+ continue;
+
+ s1 = nl80211_get_ie((u8 *) (res->res[i] + 1),
+ res->res[i]->ie_len, WLAN_EID_SSID);
+ s2 = nl80211_get_ie((u8 *) (r + 1), r->ie_len, WLAN_EID_SSID);
+ if (s1 == NULL || s2 == NULL || s1[1] != s2[1] ||
+ os_memcmp(s1, s2, 2 + s1[1]) != 0)
+ continue;
+
+ /* Same BSSID,SSID was already included in scan results */
+ wpa_printf(MSG_DEBUG, "nl80211: Remove duplicated scan result "
+ "for " MACSTR, MAC2STR(r->bssid));
+
+ if (((r->flags & WPA_SCAN_ASSOCIATED) &&
+ !(res->res[i]->flags & WPA_SCAN_ASSOCIATED)) ||
+ r->age < res->res[i]->age) {
+ os_free(res->res[i]);
+ res->res[i] = r;
+ } else
+ os_free(r);
+ return NL_SKIP;
+ }
+
+ tmp = os_realloc_array(res->res, res->num + 1,
+ sizeof(struct wpa_scan_res *));
+ if (tmp == NULL) {
+ os_free(r);
+ return NL_SKIP;
+ }
+ tmp[res->num++] = r;
+ res->res = tmp;
+
+ return NL_SKIP;
+}
+
+
+static void clear_state_mismatch(struct wpa_driver_nl80211_data *drv,
+ const u8 *addr)
+{
+ if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
+ wpa_printf(MSG_DEBUG, "nl80211: Clear possible state "
+ "mismatch (" MACSTR ")", MAC2STR(addr));
+ wpa_driver_nl80211_mlme(drv, addr,
+ NL80211_CMD_DEAUTHENTICATE,
+ WLAN_REASON_PREV_AUTH_NOT_VALID, 1);
+ }
+}
+
+
+static void wpa_driver_nl80211_check_bss_status(
+ struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
+{
+ size_t i;
+
+ for (i = 0; i < res->num; i++) {
+ struct wpa_scan_res *r = res->res[i];
+
+ if (r->flags & WPA_SCAN_ASSOCIATED) {
+ wpa_printf(MSG_DEBUG, "nl80211: Scan results "
+ "indicate BSS status with " MACSTR
+ " as associated",
+ MAC2STR(r->bssid));
+ if (is_sta_interface(drv->nlmode) &&
+ !drv->associated) {
+ wpa_printf(MSG_DEBUG, "nl80211: Local state "
+ "(not associated) does not match "
+ "with BSS state");
+ clear_state_mismatch(drv, r->bssid);
+ } else if (is_sta_interface(drv->nlmode) &&
+ os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
+ 0) {
+ wpa_printf(MSG_DEBUG, "nl80211: Local state "
+ "(associated with " MACSTR ") does "
+ "not match with BSS state",
+ MAC2STR(drv->bssid));
+ clear_state_mismatch(drv, r->bssid);
+ clear_state_mismatch(drv, drv->bssid);
+ }
+ }
+ }
+}
+
+
+static struct wpa_scan_results *
+nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
+{
+ struct nl_msg *msg;
+ struct wpa_scan_results *res;
+ int ret;
+ struct nl80211_bss_info_arg arg;
+
+ res = os_zalloc(sizeof(*res));
+ if (res == NULL)
+ return NULL;
+ if (!(msg = nl80211_cmd_msg(drv->first_bss, NLM_F_DUMP,
+ NL80211_CMD_GET_SCAN))) {
+ wpa_scan_results_free(res);
+ return NULL;
+ }
+
+ arg.drv = drv;
+ arg.res = res;
+ ret = send_and_recv_msgs(drv, msg, bss_info_handler, &arg);
+ if (ret == 0) {
+ wpa_printf(MSG_DEBUG, "nl80211: Received scan results (%lu "
+ "BSSes)", (unsigned long) res->num);
+ nl80211_get_noise_for_scan_results(drv, res);
+ return res;
+ }
+ wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "
+ "(%s)", ret, strerror(-ret));
+ wpa_scan_results_free(res);
+ return NULL;
+}
+
+
+/**
+ * wpa_driver_nl80211_get_scan_results - Fetch the latest scan results
+ * @priv: Pointer to private wext data from wpa_driver_nl80211_init()
+ * Returns: Scan results on success, -1 on failure
+ */
+struct wpa_scan_results * wpa_driver_nl80211_get_scan_results(void *priv)
+{
+ struct i802_bss *bss = priv;
+ struct wpa_driver_nl80211_data *drv = bss->drv;
+ struct wpa_scan_results *res;
+
+ res = nl80211_get_scan_results(drv);
+ if (res)
+ wpa_driver_nl80211_check_bss_status(drv, res);
+ return res;
+}
+
+
+void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv)
+{
+ struct wpa_scan_results *res;
+ size_t i;
+
+ res = nl80211_get_scan_results(drv);
+ if (res == NULL) {
+ wpa_printf(MSG_DEBUG, "nl80211: Failed to get scan results");
+ return;
+ }
+
+ wpa_printf(MSG_DEBUG, "nl80211: Scan result dump");
+ for (i = 0; i < res->num; i++) {
+ struct wpa_scan_res *r = res->res[i];
+ wpa_printf(MSG_DEBUG, "nl80211: %d/%d " MACSTR "%s",
+ (int) i, (int) res->num, MAC2STR(r->bssid),
+ r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
+ }
+
+ wpa_scan_results_free(res);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-02 05:22:36 +0000