[PATCH v3 6/7] multiple_bssid: always use the transmitting BSSs when generating the beacons

[John Crispin <john@xxxxxxxxxxx>]

Add the multiple bssid IEs to the probe response. If this is a unicast
request only add the requested non-transmitting BSS. Beacons track the
IEs in an additional array and pass them to the kernel which will be
responsible for creating the EMA beacons.

When generating a beacon or probe response for a non transmitting BSS,
always use the transmittings BSSs data. If this is a legacy beacon, the
helper becomes a no-op.

Signed-off-by: John Crispin <john@xxxxxxxxxxx>
---
 src/ap/beacon.c            | 30 ++++++++++++++++++++++++++++--
 src/ap/ieee802_11_shared.c |  2 ++
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/ap/beacon.c b/src/ap/beacon.c
index 4988ee2a1..c59842edc 100644
--- a/src/ap/beacon.c
+++ b/src/ap/beacon.c
@@ -293,7 +293,7 @@ static const u8 * hostapd_vendor_wpa_ie(struct hostapd_data *hapd,
 }
 
 
-static u8 * hostapd_get_rsne(struct hostapd_data *hapd, u8 *pos, size_t len)
+u8 * hostapd_get_rsne(struct hostapd_data *hapd, u8 *pos, size_t len)
 {
 	const u8 *ie;
 
@@ -436,6 +436,9 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 	u8 *pos, *epos, *csa_pos;
 	size_t buflen;
 
+	if (hapd->iconf->multiple_bssid)
+		hapd = hostapd_get_primary_bss(hapd);
+
 #define MAX_PROBERESP_LEN 768
 	buflen = MAX_PROBERESP_LEN;
 #ifdef CONFIG_WPS
@@ -472,6 +475,8 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 	buflen += hostapd_mbo_ie_len(hapd);
 	buflen += hostapd_eid_owe_trans_len(hapd);
 	buflen += hostapd_eid_dpp_cc_len(hapd);
+	if (hapd->iconf->multiple_bssid)
+		buflen += hostapd_eid_multiple_bssid_len(hapd);
 
 	resp = os_zalloc(buflen);
 	if (resp == NULL)
@@ -527,6 +532,9 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 	pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos);
 	pos = hostapd_get_mde(hapd, pos, epos - pos);
 
+        if (hapd->iconf->multiple_bssid)
+		pos = hostapd_eid_multiple_bssid(hapd, pos, epos, 0, NULL, 0, 0);
+
 	/* eCSA IE */
 	csa_pos = hostapd_eid_ecsa(hapd, pos);
 	if (csa_pos != pos)
@@ -818,6 +826,10 @@ void handle_probe_req(struct hostapd_data *hapd,
 	size_t csa_offs_len;
 	struct radius_sta rad_info;
 
+        if (hapd->iconf->multiple_bssid &&
+	    hapd != hostapd_get_primary_bss(hapd))
+		return;
+
 	if (len < IEEE80211_HDRLEN)
 		return;
 	ie = ((const u8 *) mgmt) + IEEE80211_HDRLEN;
@@ -1061,7 +1073,7 @@ void handle_probe_req(struct hostapd_data *hapd,
 				hapd->cs_c_off_ecsa_proberesp;
 	}
 
-	ret = hostapd_drv_send_mlme(hapd, resp, resp_len, noack,
+	ret = hostapd_drv_send_mlme(hostapd_get_primary_bss(hapd), resp, resp_len, noack,
 				    csa_offs_len ? csa_offs : NULL,
 				    csa_offs_len, 0);
 
@@ -1461,6 +1473,8 @@ void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 	params->head = NULL;
 	os_free(params->proberesp);
 	params->proberesp = NULL;
+	os_free(params->multiple_bssid_ies);
+	params->multiple_bssid_ies = NULL;
 }
 
 
@@ -1507,8 +1521,20 @@ int ieee802_11_set_beacon(struct hostapd_data *hapd)
 							    IEEE80211_MODE_AP);
 #endif /* CONFIG_IEEE80211AX */
         if (hapd->iconf->multiple_bssid) {
+		int len = hostapd_eid_multiple_bssid_len(hapd);
+		u8 *end;
+
 		params.multiple_bssid_index = hostapd_get_bss_index(hapd);
 		params.multiple_bssid_count = iface->num_bss;
+		params.multiple_bssid_ies = os_zalloc(len);
+		if (params.multiple_bssid_ies == NULL)
+			goto fail;
+		end = hostapd_eid_multiple_bssid(hapd, params.multiple_bssid_ies,
+						 params.multiple_bssid_ies + len,
+						 1, params.multiple_bssid_ie_offsets,
+						 &params.multiple_bssid_ie_count,
+						 MULTIPLE_BSSID_IE_MAX);
+		params.multiple_bssid_ie_len = end - params.multiple_bssid_ies;
 	}
 	hapd->reenable_beacon = 0;
 
diff --git a/src/ap/ieee802_11_shared.c b/src/ap/ieee802_11_shared.c
index 79ed450e2..961e91e66 100644
--- a/src/ap/ieee802_11_shared.c
+++ b/src/ap/ieee802_11_shared.c
@@ -356,6 +356,8 @@ static void hostapd_ext_capab_byte(struct hostapd_data *hapd, u8 *pos, int idx)
 			*pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
 		if (hapd->conf->bss_transition)
 			*pos |= 0x08; /* Bit 19 - BSS Transition */
+		if (hapd->iconf->multiple_bssid)
+                        *pos |= 0x40; /* Bit 22 - Multiple BSSID */
 		break;
 	case 3: /* Bits 24-31 */
 #ifdef CONFIG_WNM_AP
-- 
2.25.1


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