hostapd: support MBO in bss_transition_request

Support the use of MBO in the bss_transition_request ubus method.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: David Bauer <mail@david-bauer.net>

package/network/services/hostapd/README.md

@@ -29,6 +29,9 @@ Initiate an 802.11v transition request.
 | neighbors | array | no | BSS Transition Candidate List |
 | abridged | bool | no | prefer APs in the BSS Transition Candidate List |
 | dialog_token | int32 | no | identifier for the request/report transaction |
+| mbo_reason | int32 | no | MBO Transition Reason Code Attribute |
+| cell_pref | int32 | no | MBO Cellular Data Connection Preference Attribute |
+| reassoc_delay | int32 | no | MBO Re-association retry delay |
 
 ### example
 `ubus call hostapd.wl5-fb bss_transition_request '{ "addr": "68:2F:67:8B:98:ED", "disassociation_imminent": false, "disassociation_timer": 0, "validity_period": 30, "neighbors": ["b6a7b9cbeebabf5900008064090603026a00"], "abridged": 1 }'`

package/network/services/hostapd/src/src/ap/ubus.c

@@ -1454,7 +1454,7 @@ void hostapd_ubus_handle_link_measurement(struct hostapd_data *hapd, const u8 *d
 static int
 hostapd_bss_tr_send(struct hostapd_data *hapd, u8 *addr, bool disassoc_imminent, bool abridged,
 		    u16 disassoc_timer, u8 validity_period, u8 dialog_token,
-		    struct blob_attr *neighbors)
+		    struct blob_attr *neighbors, u8 mbo_reason, u8 cell_pref, u8 reassoc_delay)
 {
 	struct blob_attr *cur;
 	struct sta_info *sta;
@@ -1462,6 +1462,8 @@ hostapd_bss_tr_send(struct hostapd_data *hapd, u8 *addr, bool disassoc_imminent,
 	int rem;
 	u8 *nr = NULL;
 	u8 req_mode = 0;
+	u8 mbo[10];
+	size_t mbo_len = 0;
 
 	sta = ap_get_sta(hapd, addr);
 	if (!sta)
@@ -1513,8 +1515,37 @@ hostapd_bss_tr_send(struct hostapd_data *hapd, u8 *addr, bool disassoc_imminent,
 	if (disassoc_imminent)
 		req_mode |= WNM_BSS_TM_REQ_DISASSOC_IMMINENT;
 
+#ifdef CONFIG_MBO
+	u8 *mbo_pos = mbo;
+
+	if (mbo_reason > MBO_TRANSITION_REASON_PREMIUM_AP)
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	if (cell_pref != 0 && cell_pref != 1 && cell_pref != 255)
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	if (reassoc_delay > 65535 || (reassoc_delay && !disassoc_imminent))
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	*mbo_pos++ = MBO_ATTR_ID_TRANSITION_REASON;
+	*mbo_pos++ = 1;
+	*mbo_pos++ = mbo_reason;
+	*mbo_pos++ = MBO_ATTR_ID_CELL_DATA_PREF;
+	*mbo_pos++ = 1;
+	*mbo_pos++ = cell_pref;
+
+	if (reassoc_delay) {
+		*mbo_pos++ = MBO_ATTR_ID_ASSOC_RETRY_DELAY;
+		*mbo_pos++ = 2;
+		WPA_PUT_LE16(mbo_pos, reassoc_delay);
+		mbo_pos += 2;
+	}
+
+	mbo_len = mbo_pos - mbo;
+#endif
+
 	if (wnm_send_bss_tm_req(hapd, sta, req_mode, disassoc_timer, validity_period, NULL,
-				dialog_token, NULL, nr, nr_len, NULL, 0))
+				dialog_token, NULL, nr, nr_len, mbo_len ? mbo : NULL, mbo_len))
 		return UBUS_STATUS_UNKNOWN_ERROR;
 
 	return 0;
@@ -1528,6 +1559,11 @@ enum {
 	BSS_TR_NEIGHBORS,
 	BSS_TR_ABRIDGED,
 	BSS_TR_DIALOG_TOKEN,
+#ifdef CONFIG_MBO
+	BSS_TR_MBO_REASON,
+	BSS_TR_CELL_PREF,
+	BSS_TR_REASSOC_DELAY,
+#endif
 	__BSS_TR_DISASSOC_MAX
 };
 
@@ -1539,6 +1575,11 @@ static const struct blobmsg_policy bss_tr_policy[__BSS_TR_DISASSOC_MAX] = {
 	[BSS_TR_NEIGHBORS] = { "neighbors", BLOBMSG_TYPE_ARRAY },
 	[BSS_TR_ABRIDGED] = { "abridged", BLOBMSG_TYPE_BOOL },
 	[BSS_TR_DIALOG_TOKEN] = { "dialog_token", BLOBMSG_TYPE_INT32 },
+#ifdef CONFIG_MBO
+	[BSS_TR_MBO_REASON] = { "mbo_reason", BLOBMSG_TYPE_INT32 },
+	[BSS_TR_CELL_PREF] = { "cell_pref", BLOBMSG_TYPE_INT32 },
+	[BSS_TR_REASSOC_DELAY] = { "reassoc_delay", BLOBMSG_TYPE_INT32 },
+#endif
 };
 
 static int
@@ -1555,6 +1596,9 @@ hostapd_bss_transition_request(struct ubus_context *ctx, struct ubus_object *obj
 	u32 dialog_token = 1;
 	bool abridged;
 	bool da_imminent;
+	u8 mbo_reason;
+	u8 cell_pref;
+	u8 reassoc_delay;
 
 	blobmsg_parse(bss_tr_policy, __BSS_TR_DISASSOC_MAX, tb, blob_data(msg), blob_len(msg));
 
@@ -1576,8 +1620,19 @@ hostapd_bss_transition_request(struct ubus_context *ctx, struct ubus_object *obj
 	da_imminent = !!(tb[BSS_TR_DA_IMMINENT] && blobmsg_get_bool(tb[BSS_TR_DA_IMMINENT]));
 	abridged = !!(tb[BSS_TR_ABRIDGED] && blobmsg_get_bool(tb[BSS_TR_ABRIDGED]));
 
+#ifdef CONFIG_MBO
+	if (tb[BSS_TR_MBO_REASON])
+		mbo_reason = blobmsg_get_u32(tb[BSS_TR_MBO_REASON]);
+
+	if (tb[BSS_TR_CELL_PREF])
+		cell_pref = blobmsg_get_u32(tb[BSS_TR_CELL_PREF]);
+
+	if (tb[BSS_TR_REASSOC_DELAY])
+		reassoc_delay = blobmsg_get_u32(tb[BSS_TR_REASSOC_DELAY]);
+#endif
+
 	return hostapd_bss_tr_send(hapd, addr, da_imminent, abridged, da_timer, valid_period,
-				   dialog_token, tb[BSS_TR_NEIGHBORS]);
+				   dialog_token, tb[BSS_TR_NEIGHBORS], mbo_reason, cell_pref, reassoc_delay);
 }
 #endif