[PATCH] ieee80211: adds support for the creation of RTS packets
tree b45c9c1017fd23216bfbe71e441aed9aa297fc84
parent 04aacdd71e904656a304d923bdcf57ad3bd2b254
author Ivo van Doorn <IvDoorn@gmail.com> 1124445405 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127313029 -0500
This patch adds support for the creation of RTS packets when the
config flag CFG_IEEE80211_RTS has been set.
Signed-Off-By: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/net/ieee80211/ieee80211_module.c b/net/ieee80211/ieee80211_module.c
index 82a4fd7..67d6bdd 100644
--- a/net/ieee80211/ieee80211_module.c
+++ b/net/ieee80211/ieee80211_module.c
@@ -126,6 +126,7 @@
/* Default fragmentation threshold is maximum payload size */
ieee->fts = DEFAULT_FTS;
+ ieee->rts = DEFAULT_FTS;
ieee->scan_age = DEFAULT_MAX_SCAN_AGE;
ieee->open_wep = 1;
diff --git a/net/ieee80211/ieee80211_tx.c b/net/ieee80211/ieee80211_tx.c
index 29770cf..cdee41c 100644
--- a/net/ieee80211/ieee80211_tx.c
+++ b/net/ieee80211/ieee80211_tx.c
@@ -222,13 +222,15 @@
return txb;
}
-/* SKBs are added to the ieee->tx_queue. */
+/* Incoming skb is converted to a txb which consist of
+ * a block of 802.11 fragment packets (stored as skbs) */
int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee80211_device *ieee = netdev_priv(dev);
struct ieee80211_txb *txb = NULL;
struct ieee80211_hdr_3addr *frag_hdr;
- 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 = &ieee->stats;
int ether_type, encrypt, host_encrypt;
@@ -334,6 +336,13 @@
else
bytes_last_frag = bytes_per_frag;
+ rts_required = (frag_size > ieee->rts
+ && ieee->config & CFG_IEEE80211_RTS);
+ if (rts_required)
+ nr_frags++;
+ else
+ bytes_last_frag = bytes_per_frag;
+
/* 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.) */
@@ -346,7 +355,33 @@
txb->encrypted = encrypt;
txb->payload_size = bytes;
- for (i = 0; i < nr_frags; i++) {
+ if (rts_required) {
+ skb_frag = txb->fragments[0];
+ frag_hdr =
+ (struct ieee80211_hdr_3addr *)skb_put(skb_frag, hdr_len);
+
+ /*
+ * Set header frame_ctl to the RTS.
+ */
+ header.frame_ctl =
+ cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
+ memcpy(frag_hdr, &header, hdr_len);
+
+ /*
+ * Restore header frame_ctl to the original data setting.
+ */
+ header.frame_ctl = cpu_to_le16(fc);
+
+ if (ieee->config &
+ (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
+ skb_put(skb_frag, 4);
+
+ txb->rts_included = 1;
+ i = 1;
+ } else
+ i = 0;
+
+ for (; i < nr_frags; i++) {
skb_frag = txb->fragments[i];
if (host_encrypt)
