[PATCH wireless] wifi: mac80211: set info->band for 802.3 encap offload frames

[Felix Fietkau <nbd@nbd.name>]

Unlike the 802.11 TX paths, ieee80211_8023_xmit() does not set
info->band from the channel context on non-MLD interfaces. It stays at
0, so ieee80211_get_tx_rates() uses the wrong band for these frames.

Set it the same way as ieee80211_build_hdr(): drop the frame if there is
no channel context, and leave the band at 0 on MLD interfaces.

Reported-by: Andrea Pesaresi <andreapesaresi82@gmail.com>
Fixes: 50ff477a8639 ("mac80211: add 802.11 encapsulation offloading support")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/tx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index c8217f6d146e..b88acb18e04d 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -4735,6 +4735,7 @@ static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
 {
 	struct ieee80211_tx_info *info;
 	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_chanctx_conf *chanctx_conf;
 	struct tid_ampdu_tx *tid_tx = NULL;
 	struct sk_buff *seg, *next;
 	unsigned int skbs = 0, len = 0;
@@ -4784,6 +4785,16 @@ static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
 		sdata = container_of(sdata->bss,
 				     struct ieee80211_sub_if_data, u.ap);
 
+	/* MLD transmissions must not rely on the band */
+	if (!ieee80211_vif_is_mld(&sdata->vif)) {
+		chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
+		if (unlikely(!chanctx_conf)) {
+			kfree_skb_list(skb);
+			return;
+		}
+		info->band = chanctx_conf->def.chan->band;
+	}
+
 	info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
 	info->control.vif = &sdata->vif;
 
-- 
2.47.3