[Ieee80211-devel] [PATCH] Add RTS support

[Ivo v. D. <iv...@gm...>]

Hi,

This patch adds support for the creation of RTS packets when the config fla=
g=20
CFG_IEEE80211_RTS has been set.

Patch is against ieee80211 1.0.3.

Signed-Off-By: Ivo van Doorn <Iv...@gm...>

IvD

diff -U 3 -H -w -E -d -r -N -- ieee80211-1.0.3/ieee80211_module.c=20
ieee80211-1.0.3-rts/ieee80211_module.c
=2D-- ieee80211-1.0.3/ieee80211_module.c	2005-07-15 01:53:35.000000000 +0200
+++ ieee80211-1.0.3-rts/ieee80211_module.c	2005-07-19 16:47:37.000000000 +0=
200
@@ -131,6 +131,7 @@
=20
 	/* Default fragmentation threshold is maximum payload size */
 	ieee->fts =3D DEFAULT_FTS;
+	ieee->rts =3D DEFAULT_FTS;
 	ieee->scan_age =3D DEFAULT_MAX_SCAN_AGE;
 	ieee->open_wep =3D 1;
=20
diff -U 3 -H -w -E -d -r -N -- ieee80211-1.0.3/ieee80211_tx.c=20
ieee80211-1.0.3-rts/ieee80211_tx.c
=2D-- ieee80211-1.0.3/ieee80211_tx.c	2005-07-15 01:53:35.000000000 +0200
+++ ieee80211-1.0.3-rts/ieee80211_tx.c	2005-07-19 16:47:37.000000000 +0200
@@ -244,7 +244,7 @@
 	struct ieee80211_device *ieee =3D netdev_priv(dev);
 	struct ieee80211_txb *txb =3D NULL;
 	struct ieee80211_hdr *frag_hdr;
=2D	int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
+	int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size, rts_required;
 	unsigned long flags;
 	struct net_device_stats *stats =3D &ieee->stats;
 	int ether_type, encrypt, host_encrypt, host_encrypt_msdu;
@@ -399,6 +399,10 @@
 		frag_size =3D bytes + IEEE80211_3ADDR_LEN;
 	}
=20
+	rts_required =3D (frag_size > ieee->rts && ieee->config & CFG_IEEE80211_R=
TS);
+	if (rts_required)
+		nr_frags++;
+
 	/* When we allocate the TXB we allocate enough space for the reserve
 	 * and full fragment bytes (bytes_per_frag doesn't include prefix,
 	 * postfix, header, FCS, etc.) */
@@ -414,7 +418,31 @@
 	else
 		txb->payload_size =3D bytes;
=20
=2D	for (i =3D 0; i < nr_frags; i++) {
+	i =3D 0;
+	if (rts_required) {
+		skb_frag =3D txb->fragments[i];
+		frag_hdr =3D (struct ieee80211_hdr *)skb_put(skb_frag, hdr_len);
+
+		/*
+		 * Set header frame_ctl to the RTS.
+		 */
+		header.frame_ctl =3D cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_R=
TS);
+		memcpy(frag_hdr, &header, hdr_len);
+
+		/*
+		 * Restore header frame_ctl to the original data setting.
+		 */
+		header.frame_ctl =3D cpu_to_le16(fc);
+
+		if (ieee->config &
+		    (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
+			skb_put(skb_frag, 4);
+
+		txb->rts_included =3D 1;
+		i =3D 1;
+	}
+
+	for (; i < nr_frags; i++) {
 		skb_frag =3D txb->fragments[i];
=20
 		if (host_encrypt)
diff -U 3 -H -w -E -d -r -N -- ieee80211-1.0.3/net/ieee80211.h=20
ieee80211-1.0.3-rts/net/ieee80211.h
=2D-- ieee80211-1.0.3/net/ieee80211.h	2005-07-15 01:53:35.000000000 +0200
+++ ieee80211-1.0.3-rts/net/ieee80211.h	2005-07-19 16:47:37.000000000 +0200
@@ -584,7 +584,8 @@
 struct ieee80211_txb {
 	u8 nr_frags;
 	u8 encrypted;
=2D	u16 reserved;
+	u8 rts_included;
+	u8 reserved;
 	u16 frag_size;
 	u16 payload_size;
 	struct sk_buff *fragments[0];
@@ -723,6 +724,7 @@
=20
 #define CFG_IEEE80211_RESERVE_FCS (1<<0)
 #define CFG_IEEE80211_COMPUTE_FCS (1<<1)
+#define CFG_IEEE80211_RTS (1<<2)
=20
 #define IEEE80211_24GHZ_MIN_FREQ 2412
 #define IEEE80211_24GHZ_MAX_FREQ 2477
@@ -821,6 +823,7 @@
 	struct ieee80211_frag_entry frag_cache[IEEE80211_FRAG_CACHE_LEN];
 	unsigned int frag_next_idx;
 	u16 fts; /* Fragmentation Threshold */
+	u16 rts; /* RTS threshold */
=20
 	/* Association info */
 	u8 bssid[ETH_ALEN];