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wifi: mac80211: add support for the monitor SKIP_TX flag

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Do not pass locally sent packets to monitor interfaces with this flag set.
Skip processing tx packets on the status call entirely if no monitor
interfaces without this flag are present.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/c327bb57ef8dadaa6a0e8e4dc2f5f99ae8123e6c.1728462320.git-series.nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2024-10-09 10:25:50 +02:00 committed by Johannes Berg
parent a77e527b47
commit 754905ce1a
3 changed files with 7 additions and 2 deletions
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2
net/mac80211/ieee80211_i.h
View File

@ -1368,7 +1368,7 @@ struct ieee80211_local {
spinlock_t queue_stop_reason_lock;
int open_count;
int monitors, cooked_mntrs;
int monitors, cooked_mntrs, tx_mntrs;
/* number of interfaces with corresponding FIF_ flags */
int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll,
fif_probe_req;

2
net/mac80211/iface.c
View File

@ -1094,6 +1094,8 @@ void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
ADJUST(CONTROL, control);
ADJUST(CONTROL, pspoll);
ADJUST(OTHER_BSS, other_bss);
if (!(flags & MONITOR_FLAG_SKIP_TX))
local->tx_mntrs += offset;
#undef ADJUST
}

5
net/mac80211/status.c
View File

@ -927,6 +927,9 @@ void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
if (!ieee80211_sdata_running(sdata))
continue;
if (sdata->u.mntr.flags & MONITOR_FLAG_SKIP_TX)
continue;
if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
!send_to_cooked)
continue;
@ -1099,7 +1102,7 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw,
* This is a bit racy but we can avoid a lot of work
* with this test...
*/
if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
if (!local->tx_mntrs && (!send_to_cooked || !local->cooked_mntrs)) {
if (status->free_list)
list_add_tail(&skb->list, status->free_list);
else