From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 30 Sep 2024 17:04:09 +0200
Subject: [PATCH] wifi: cfg80211: add monitor SKIP_TX flag

This can be used to indicate that the user is not interested in receiving
locally sent packets on the monitor interface.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2272,6 +2272,7 @@ static inline int cfg80211_get_station(s
  * @MONITOR_FLAG_OTHER_BSS: disable BSSID filtering
  * @MONITOR_FLAG_COOK_FRAMES: report frames after processing
  * @MONITOR_FLAG_ACTIVE: active monitor, ACKs frames on its MAC address
+ * @MONITOR_FLAG_SKIP_TX: do not pass locally transmitted frames
  */
 enum monitor_flags {
 	MONITOR_FLAG_CHANGED		= BIT(__NL80211_MNTR_FLAG_INVALID),
@@ -2281,6 +2282,7 @@ enum monitor_flags {
 	MONITOR_FLAG_OTHER_BSS		= BIT(NL80211_MNTR_FLAG_OTHER_BSS),
 	MONITOR_FLAG_COOK_FRAMES	= BIT(NL80211_MNTR_FLAG_COOK_FRAMES),
 	MONITOR_FLAG_ACTIVE		= BIT(NL80211_MNTR_FLAG_ACTIVE),
+	MONITOR_FLAG_SKIP_TX		= BIT(NL80211_MNTR_FLAG_SKIP_TX),
 };
 
 /**
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -4703,6 +4703,7 @@ enum nl80211_survey_info {
  *	overrides all other flags.
  * @NL80211_MNTR_FLAG_ACTIVE: use the configured MAC address
  *	and ACK incoming unicast packets.
+ * @NL80211_MNTR_FLAG_SKIP_TX: do not pass local tx packets
  *
  * @__NL80211_MNTR_FLAG_AFTER_LAST: internal use
  * @NL80211_MNTR_FLAG_MAX: highest possible monitor flag
@@ -4715,6 +4716,7 @@ enum nl80211_mntr_flags {
 	NL80211_MNTR_FLAG_OTHER_BSS,
 	NL80211_MNTR_FLAG_COOK_FRAMES,
 	NL80211_MNTR_FLAG_ACTIVE,
+	NL80211_MNTR_FLAG_SKIP_TX,
 
 	/* keep last */
 	__NL80211_MNTR_FLAG_AFTER_LAST,
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4201,6 +4201,7 @@ static const struct nla_policy mntr_flag
 	[NL80211_MNTR_FLAG_OTHER_BSS] = { .type = NLA_FLAG },
 	[NL80211_MNTR_FLAG_COOK_FRAMES] = { .type = NLA_FLAG },
 	[NL80211_MNTR_FLAG_ACTIVE] = { .type = NLA_FLAG },
+	[NL80211_MNTR_FLAG_SKIP_TX] = { .type = NLA_FLAG },
 };
 
 static int parse_monitor_flags(struct nlattr *nla, u32 *mntrflags)
