Add two new functions:

- ieee80211_get_rts
- ieee80211_get_cts_to_self
that can be use by drivers for chipsets that don't offer hardware assisted
RTS/CTS protection (like ral/ural/rum).

"no objections here" jsg@

1 files changed, 55 insertions, 1 deletions

diff --git a/sys/net80211/ieee80211_output.c b/sys/net80211/ieee80211_output.c
index a90f55453fc..2965b623364 100644
--- a/sys/net80211/ieee80211_output.c
+++ b/sys/net80211/ieee80211_output.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ieee80211_output.c,v 1.21 2006/06/27 20:55:51 reyk Exp $	*/
+/*	$OpenBSD: ieee80211_output.c,v 1.22 2006/11/03 19:02:08 damien Exp $	*/
 /*	$NetBSD: ieee80211_output.c,v 1.13 2004/05/31 11:02:55 dyoung Exp $	*/
 
 /*-
@@ -929,6 +929,60 @@ bad:
 #undef senderr
 }
 
+/*
+ * Build a RTS (Request To Send) control frame.
+ */
+struct mbuf *
+ieee80211_get_rts(struct ieee80211com *ic, const struct ieee80211_frame *wh,
+    u_int16_t dur)
+{
+	struct ieee80211_frame_rts *rts;
+	struct mbuf *m;
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	if (m == NULL) {
+		ic->ic_stats.is_tx_nombuf++;
+		return NULL;
+	}
+	m->m_pkthdr.len = m->m_len = sizeof (struct ieee80211_frame_rts);
+
+	rts = mtod(m, struct ieee80211_frame_rts *);
+	rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_CTL |
+	    IEEE80211_FC0_SUBTYPE_RTS;
+	rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
+	*(uint16_t *)rts->i_dur = htole16(dur);
+	IEEE80211_ADDR_COPY(rts->i_ra, wh->i_addr1);
+	IEEE80211_ADDR_COPY(rts->i_ta, wh->i_addr2);
+
+	return m;
+}
+
+/*
+ * Build a CTS-to-self (Clear To Send) control frame.
+ */
+struct mbuf *
+ieee80211_get_cts_to_self(struct ieee80211com *ic, u_int16_t dur)
+{
+	struct ieee80211_frame_cts *cts;
+	struct mbuf *m;
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	if (m == NULL) {
+		ic->ic_stats.is_tx_nombuf++;
+		return NULL;
+	}
+	m->m_pkthdr.len = m->m_len = sizeof (struct ieee80211_frame_cts);
+
+	cts = mtod(m, struct ieee80211_frame_cts *);
+	cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_CTL |
+	    IEEE80211_FC0_SUBTYPE_CTS;
+	cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
+	*(uint16_t *)cts->i_dur = htole16(dur);
+	IEEE80211_ADDR_COPY(cts->i_ra, ic->ic_myaddr);
+
+	return m;
+}
+
 struct mbuf *
 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni)
 {