From b226a826d83d66806fae20fc3518dace8b86bacb Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 22 Nov 2019 12:42:42 +0100 Subject: [PATCH] mac80211: add a comment about monitor-to-dev injection Add a note with a use-case for the monitor-to-dev injection mechanism in mac80211, reported by Ben Greear. Change-Id: I6456997ef9bc40b24ede860b6ef2fed5af49cf44 Signed-off-by: Johannes Berg --- net/mac80211/tx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index db38be1b75fa..a53af8cd3756 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2270,6 +2270,9 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, * isn't always enough to find the interface to use; for proper * VLAN/WDS support we will need a different mechanism (which * likely isn't going to be monitor interfaces). + * + * This is necessary, for example, for old hostapd versions that + * don't use nl80211-based management TX/RX. */ sdata = IEEE80211_DEV_TO_SUB_IF(dev);