From d24ac5fb28cfd201ce1e701bbb511e1c277b5a98 Mon Sep 17 00:00:00 2001
From: Adrian Chadd <adrian@FreeBSD.org>
Date: Sun, 23 Oct 2016 08:21:35 +0000
Subject: [PATCH] [net80211] Add a variant on ieee80211_get_rx_params() that
 returns a pointer.

Be careful when calling this, as the underlying mbuf may change
afterwards - common in the RX path.
---
 sys/net80211/ieee80211_freebsd.c | 15 +++++++++++++++
 sys/net80211/ieee80211_freebsd.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/sys/net80211/ieee80211_freebsd.c b/sys/net80211/ieee80211_freebsd.c
index e685e1d37d60..bf0407c0b840 100644
--- a/sys/net80211/ieee80211_freebsd.c
+++ b/sys/net80211/ieee80211_freebsd.c
@@ -529,6 +529,21 @@ ieee80211_get_rx_params(struct mbuf *m, struct ieee80211_rx_stats *rxs)
 	return (0);
 }
 
+const struct ieee80211_rx_stats *
+ieee80211_get_rx_params_ptr(struct mbuf *m)
+{
+	struct m_tag *mtag;
+	struct ieee80211_rx_params *rx;
+
+	mtag = m_tag_locate(m, MTAG_ABI_NET80211, NET80211_TAG_RECV_PARAMS,
+	    NULL);
+	if (mtag == NULL)
+		return (NULL);
+	rx = (struct ieee80211_rx_params *)(mtag + 1);
+	return (&rx->params);
+}
+
+
 /*
  * Add TOA parameters to the given mbuf.
  */
diff --git a/sys/net80211/ieee80211_freebsd.h b/sys/net80211/ieee80211_freebsd.h
index f21423c3e375..cbacc08b51cf 100644
--- a/sys/net80211/ieee80211_freebsd.h
+++ b/sys/net80211/ieee80211_freebsd.h
@@ -713,6 +713,7 @@ int	ieee80211_add_rx_params(struct mbuf *m,
 	    const struct ieee80211_rx_stats *rxs);
 int	ieee80211_get_rx_params(struct mbuf *m,
 	    struct ieee80211_rx_stats *rxs);
+const struct ieee80211_rx_stats * ieee80211_get_rx_params_ptr(struct mbuf *m);
 
 struct ieee80211_toa_params {
 	int request_id;