wifi: mac80211: Add support for parsing Reconfiguration Multi Link element

Parse Reconfiguration Multi Link IE.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230616094949.6eeb6c9a4a6e.I1cb137da9b3c712fc7c7949a6dec9e314b5d7f63@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/ieee80211_i.h

@@ -1727,6 +1727,7 @@ struct ieee802_11_elems {
 	const struct ieee80211_eht_cap_elem *eht_cap;
 	const struct ieee80211_eht_operation *eht_operation;
 	const struct ieee80211_multi_link_elem *ml_basic;
+	const struct ieee80211_multi_link_elem *ml_reconf;
 
 	/* length of them, respectively */
 	u8 ext_capab_len;
@@ -1752,10 +1753,14 @@ struct ieee802_11_elems {
 
 	/* mult-link element can be de-fragmented and thus u8 is not sufficient */
 	size_t ml_basic_len;
+	size_t ml_reconf_len;
 
 	/* The basic Multi-Link element in the original IEs */
 	const struct element *ml_basic_elem;
 
+	/* The reconfiguration Multi-Link element in the original IEs */
+	const struct element *ml_reconf_elem;
+
 	/*
 	 * store the per station profile pointer and length in case that the
 	 * parsing also handled Multi-Link element parsing for a specific link

net/mac80211/util.c

@@ -984,9 +984,24 @@ ieee80211_parse_extension_element(u32 *crc,
 		break;
 	case WLAN_EID_EXT_EHT_MULTI_LINK:
 		if (ieee80211_mle_size_ok(data, len)) {
-			elems->ml_basic_elem = (void *)elem;
-			elems->ml_basic = (void *)data;
-			elems->ml_basic_len = len;
+			const struct ieee80211_multi_link_elem *mle =
+				(void *)data;
+
+			switch (le16_get_bits(mle->control,
+					      IEEE80211_ML_CONTROL_TYPE)) {
+			case IEEE80211_ML_CONTROL_TYPE_BASIC:
+				elems->ml_basic_elem = (void *)elem;
+				elems->ml_basic = data;
+				elems->ml_basic_len = len;
+				break;
+			case IEEE80211_ML_CONTROL_TYPE_RECONF:
+				elems->ml_reconf_elem = (void *)elem;
+				elems->ml_reconf = data;
+				elems->ml_reconf_len = len;
+				break;
+			default:
+				break;
+			}
 		}
 		break;
 	}