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authorRajkumar Manoharan <rmanohar@qca.qualcomm.com>2012-05-03 09:13:43 (GMT)
committerJouni Malinen <j@w1.fi>2012-05-03 12:55:38 (GMT)
commitc3701c66a5f57c95b7353688429149e904a9d1df (patch)
tree6cb4261fcd75e7e80b3108cbaacf89af3c89fae6 /wpa_supplicant/sme.c
parent73cdd917a33ebaaed8dca43e16eb5432eb20ccba (diff)
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Add handling of OBSS scan requests and 20/40 BSS coex reports
Add support for HT STA to report 40 MHz intolerance to the associated AP. A HT station generates a report (20/40 BSS coexistence) of channel list if it finds a non-HT capable AP or a HT AP which prohibits 40 MHz transmission (i.e., 40 MHz intolerant bit is set in HT capabilities IE) from the scan results. Parse the OBSS scan parameter from Beacon or Probe Response frames and schedule periodic scan to generate 20/40 coexistence channel report if requested to do so. This patch decodes Scan Interval alone from the OBSS Scan Parameters element and triggers scan on timeout. Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com> Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
Diffstat (limited to 'wpa_supplicant/sme.c')
-rw-r--r--wpa_supplicant/sme.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/wpa_supplicant/sme.c b/wpa_supplicant/sme.c
index b366847..0051ded 100644
--- a/wpa_supplicant/sme.c
+++ b/wpa_supplicant/sme.c
@@ -32,6 +32,7 @@
static void sme_auth_timer(void *eloop_ctx, void *timeout_ctx);
static void sme_assoc_timer(void *eloop_ctx, void *timeout_ctx);
+static void sme_obss_scan_timeout(void *eloop_ctx, void *timeout_ctx);
#ifdef CONFIG_IEEE80211W
static void sme_stop_sa_query(struct wpa_supplicant *wpa_s);
#endif /* CONFIG_IEEE80211W */
@@ -606,6 +607,221 @@ void sme_deinit(struct wpa_supplicant *wpa_s)
eloop_cancel_timeout(sme_assoc_timer, wpa_s, NULL);
eloop_cancel_timeout(sme_auth_timer, wpa_s, NULL);
+ eloop_cancel_timeout(sme_obss_scan_timeout, wpa_s, NULL);
+}
+
+
+static void sme_send_2040_bss_coex(struct wpa_supplicant *wpa_s,
+ const u8 *chan_list, u8 num_channels,
+ u8 num_intol)
+{
+ struct ieee80211_2040_bss_coex_ie *bc_ie;
+ struct ieee80211_2040_intol_chan_report *ic_report;
+ struct wpabuf *buf;
+
+ wpa_printf(MSG_DEBUG, "SME: Send 20/40 BSS Coexistence to " MACSTR,
+ MAC2STR(wpa_s->bssid));
+
+ buf = wpabuf_alloc(2 + /* action.category + action_code */
+ sizeof(struct ieee80211_2040_bss_coex_ie) +
+ sizeof(struct ieee80211_2040_intol_chan_report) +
+ num_channels);
+ if (buf == NULL)
+ return;
+
+ wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
+ wpabuf_put_u8(buf, WLAN_PA_20_40_BSS_COEX);
+
+ bc_ie = wpabuf_put(buf, sizeof(*bc_ie));
+ bc_ie->element_id = WLAN_EID_20_40_BSS_COEXISTENCE;
+ bc_ie->length = 1;
+ if (num_intol)
+ bc_ie->coex_param |= WLAN_20_40_BSS_COEX_20MHZ_WIDTH_REQ;
+
+ if (num_channels > 0) {
+ ic_report = wpabuf_put(buf, sizeof(*ic_report));
+ ic_report->element_id = WLAN_EID_20_40_BSS_INTOLERANT;
+ ic_report->length = num_channels + 1;
+ ic_report->op_class = 0;
+ os_memcpy(wpabuf_put(buf, num_channels), chan_list,
+ num_channels);
+ }
+
+ if (wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
+ wpa_s->own_addr, wpa_s->bssid,
+ wpabuf_head(buf), wpabuf_len(buf), 0) < 0) {
+ wpa_msg(wpa_s, MSG_INFO,
+ "SME: Failed to send 20/40 BSS Coexistence frame");
+ }
+
+ wpabuf_free(buf);
+}
+
+
+/**
+ * enum wpas_band - Frequency band
+ * @WPAS_BAND_2GHZ: 2.4 GHz ISM band
+ * @WPAS_BAND_5GHZ: around 5 GHz band (4.9 - 5.7 GHz)
+ */
+enum wpas_band {
+ WPAS_BAND_2GHZ,
+ WPAS_BAND_5GHZ,
+ WPAS_BAND_INVALID
+};
+
+/**
+ * freq_to_channel - Convert frequency into channel info
+ * @channel: Buffer for returning channel number
+ * Returns: Band (2 or 5 GHz)
+ */
+static enum wpas_band freq_to_channel(int freq, u8 *channel)
+{
+ enum wpas_band band = (freq <= 2484) ? WPAS_BAND_2GHZ : WPAS_BAND_5GHZ;
+ u8 chan = 0;
+
+ if (freq >= 2412 && freq <= 2472)
+ chan = (freq - 2407) / 5;
+ else if (freq == 2484)
+ chan = 14;
+ else if (freq >= 5180 && freq <= 5805)
+ chan = (freq - 5000) / 5;
+
+ *channel = chan;
+ return band;
+}
+
+
+int sme_proc_obss_scan(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_bss *bss;
+ const u8 *ie;
+ u16 ht_cap;
+ u8 chan_list[P2P_MAX_CHANNELS], channel;
+ u8 num_channels = 0, num_intol = 0, i;
+
+ if (!wpa_s->sme.sched_obss_scan)
+ return 0;
+
+ wpa_s->sme.sched_obss_scan = 0;
+ if (!wpa_s->current_bss || wpa_s->wpa_state != WPA_COMPLETED)
+ return 1;
+
+ /*
+ * Check whether AP uses regulatory triplet or channel triplet in
+ * country info. Right now the operating class of the BSS channel
+ * width trigger event is "unknown" (IEEE Std 802.11-2012 10.15.12),
+ * based on the assumption that operating class triplet is not used in
+ * beacon frame. If the First Channel Number/Operating Extension
+ * Identifier octet has a positive integer value of 201 or greater,
+ * then its operating class triplet.
+ *
+ * TODO: If Supported Operating Classes element is present in beacon
+ * frame, have to lookup operating class in Annex E and fill them in
+ * 2040 coex frame.
+ */
+ ie = wpa_bss_get_ie(wpa_s->current_bss, WLAN_EID_COUNTRY);
+ if (ie && (ie[1] >= 6) && (ie[5] >= 201))
+ return 1;
+
+ os_memset(chan_list, 0, sizeof(chan_list));
+
+ dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
+ /* Skip other band bss */
+ if (freq_to_channel(bss->freq, &channel) != WPAS_BAND_2GHZ)
+ continue;
+
+ ie = wpa_bss_get_ie(bss, WLAN_EID_HT_CAP);
+ ht_cap = (ie && (ie[1] == 26)) ? WPA_GET_LE16(ie + 2) : 0;
+
+ if (!ht_cap || (ht_cap & HT_CAP_INFO_40MHZ_INTOLERANT)) {
+ /* Check whether the channel is already considered */
+ for (i = 0; i < num_channels; i++) {
+ if (channel == chan_list[i])
+ break;
+ }
+ if (i != num_channels)
+ continue;
+
+ if (ht_cap & HT_CAP_INFO_40MHZ_INTOLERANT)
+ num_intol++;
+
+ chan_list[num_channels++] = channel;
+ }
+ }
+
+ sme_send_2040_bss_coex(wpa_s, chan_list, num_channels, num_intol);
+ return 1;
+}
+
+
+static void sme_obss_scan_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+ struct wpa_driver_scan_params params;
+
+ if (!wpa_s->current_bss) {
+ wpa_printf(MSG_DEBUG, "SME OBSS: Ignore scan request");
+ return;
+ }
+
+ os_memset(&params, 0, sizeof(params));
+ /* TODO: 2.4 GHz channels only */
+ wpa_printf(MSG_DEBUG, "SME OBSS: Request an OBSS scan");
+
+ if (wpa_supplicant_trigger_scan(wpa_s, &params))
+ wpa_printf(MSG_DEBUG, "SME OBSS: Failed to trigger scan");
+ else
+ wpa_s->sme.sched_obss_scan = 1;
+
+ eloop_register_timeout(wpa_s->sme.obss_scan_int, 0,
+ sme_obss_scan_timeout, wpa_s, NULL);
+}
+
+
+void sme_sched_obss_scan(struct wpa_supplicant *wpa_s, int enable)
+{
+ const u8 *ie;
+ struct wpa_bss *bss = wpa_s->current_bss;
+ struct wpa_ssid *ssid = wpa_s->current_ssid;
+
+ eloop_cancel_timeout(sme_obss_scan_timeout, wpa_s, NULL);
+ wpa_s->sme.sched_obss_scan = 0;
+ if (!enable)
+ return;
+
+ if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME) || ssid == NULL ||
+ ssid->mode != IEEE80211_MODE_INFRA)
+ return; /* Not using station SME in wpa_supplicant */
+
+ if (!wpa_s->hw.modes ||
+ !(wpa_s->hw.modes->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET))
+ return; /* Driver does not support HT40 */
+
+ if (bss == NULL || bss->freq < 2400 || bss->freq > 2500)
+ return; /* Not associated on 2.4 GHz band */
+
+ /* Check whether AP supports HT40 */
+ ie = wpa_bss_get_ie(wpa_s->current_bss, WLAN_EID_HT_CAP);
+ if (!ie || ie[1] < 2 ||
+ !(WPA_GET_LE16(ie + 2) & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET))
+ return; /* AP does not support HT40 */
+
+ ie = wpa_bss_get_ie(wpa_s->current_bss,
+ WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS);
+ if (!ie || ie[1] < 14)
+ return; /* AP does not request OBSS scans */
+
+ wpa_s->sme.obss_scan_int = WPA_GET_LE16(ie + 6);
+ if (wpa_s->sme.obss_scan_int < 10) {
+ wpa_printf(MSG_DEBUG, "SME: Invalid OBSS Scan Interval %u "
+ "replaced with the minimum 10 sec",
+ wpa_s->sme.obss_scan_int);
+ wpa_s->sme.obss_scan_int = 10;
+ }
+ wpa_printf(MSG_DEBUG, "SME: OBSS Scan Interval %u sec",
+ wpa_s->sme.obss_scan_int);
+ eloop_register_timeout(wpa_s->sme.obss_scan_int, 0,
+ sme_obss_scan_timeout, wpa_s, NULL);
}