wifi: mac80211: determine missing link_id in ieee80211_rx_for_interface() based on...

For broadcast frames, every interface might have to process it and
therefore the link_id cannot be determined in the driver.

In mac80211, when the frame is about to be forwarded to each interface,
we can use the member "freq" in struct ieee80211_rx_status to determine
the "link_id" for each interface.

Signed-off-by: Michael-CY Lee <michael-cy.lee@mediatek.com>
Reviewed-by: Money Wang <money.wang@mediatek.com>
Link: https://patch.msgid.link/20250721062929.1662700-1-michael-cy.lee@mediatek.com
[simplify, remove unnecessary link->conf check]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index b414c9e6e61b1f8360cd0e03f489bc9601bf8f73..576e399fc99cfd82122ffe2c3689409df2508f44 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -5106,8 +5106,24 @@ static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
                struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 
                sta = sta_info_get_bss(rx->sdata, hdr->addr2);
-               if (status->link_valid)
+               if (status->link_valid) {
                        link_id = status->link_id;
+               } else if (ieee80211_vif_is_mld(&rx->sdata->vif) &&
+                          status->freq) {
+                       struct ieee80211_link_data *link;
+                       struct ieee80211_chanctx_conf *conf;
+
+                       for_each_link_data_rcu(rx->sdata, link) {
+                               conf = rcu_dereference(link->conf->chanctx_conf);
+                               if (!conf || !conf->def.chan)
+                                       continue;
+
+                               if (status->freq == conf->def.chan->center_freq) {
+                                       link_id = link->link_id;
+                                       break;
+                               }
+                       }
+               }
        }
 
        if (!ieee80211_rx_data_set_sta(rx, sta, link_id))