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mac80211: add a comment about monitor-to-dev injection

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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 <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2019-11-22 12:42:42 +01:00
parent 13baf667fa
commit b226a826d8
1 changed files with 3 additions and 0 deletions
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3
net/mac80211/tx.c
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@ -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 * isn't always enough to find the interface to use; for proper
* VLAN/WDS support we will need a different mechanism (which * VLAN/WDS support we will need a different mechanism (which
* likely isn't going to be monitor interfaces). * 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); sdata = IEEE80211_DEV_TO_SUB_IF(dev);