wifi: nl80211: send MLO links channel info in GET_INTERFACE

Currently, MLO link level channel information not sent to
userspace when NL80211_CMD_GET_INTERFACE requested on MLD.

Add support to send channel information for all valid links
for NL80211_CMD_GET_INTERFACE request.
Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
Link: https://lore.kernel.org/r/20220722131000.3437894-1-quic_vjakkam@quicinc.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -3865,12 +3865,19 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
 
 		for_each_valid_link(wdev, link_id) {
 			struct nlattr *link = nla_nest_start(msg, link_id + 1);
+			struct cfg80211_chan_def chandef = {};
+			int ret;
 
 			if (nla_put_u8(msg, NL80211_ATTR_MLO_LINK_ID, link_id))
 				goto nla_put_failure;
 			if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN,
 				    wdev->links[link_id].addr))
 				goto nla_put_failure;
+
+			ret = rdev_get_channel(rdev, wdev, link_id, &chandef);
+			if (ret == 0 && nl80211_send_chandef(msg, &chandef))
+				goto nla_put_failure;
+
 			nla_nest_end(msg, link);
 		}