Adds sequence numbers to IEEE 802.11 headers.


Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: Jirka Bohac <jbohac@suse.cz>

Index: netdev/include/net/ieee80211.h
===================================================================
--- netdev.orig/include/net/ieee80211.h	2005-09-17 14:52:22.000000000 +0200
+++ netdev/include/net/ieee80211.h	2005-09-17 14:52:41.000000000 +0200
@@ -729,6 +729,8 @@ struct ieee80211_device {
 	unsigned int frag_next_idx;
 	u16 fts;		/* Fragmentation Threshold */
 
+	u16 seq_number;	/* sequence number in transmitted frames */
+
 	/* Association info */
 	u8 bssid[ETH_ALEN];
 
Index: netdev/net/ieee80211/ieee80211_module.c
===================================================================
--- netdev.orig/net/ieee80211/ieee80211_module.c	2005-09-17 14:51:12.000000000 +0200
+++ netdev/net/ieee80211/ieee80211_module.c	2005-09-17 14:52:41.000000000 +0200
@@ -138,6 +138,7 @@ struct ieee80211_device *alloc_ieee80211
 
 	/* Default fragmentation threshold is maximum payload size */
 	ieee->fts = DEFAULT_FTS;
+	ieee->seq_number = 0;
 	ieee->scan_age = DEFAULT_MAX_SCAN_AGE;
 	ieee->open_wep = 1;
 
Index: netdev/net/ieee80211/ieee80211_tx.c
===================================================================
--- netdev.orig/net/ieee80211/ieee80211_tx.c	2005-09-17 14:51:12.000000000 +0200
+++ netdev/net/ieee80211/ieee80211_tx.c	2005-09-17 14:52:41.000000000 +0200
@@ -368,6 +368,13 @@ int ieee80211_xmit(struct sk_buff *skb, 
 	else
 		bytes_last_frag = bytes_per_frag;
 
+	if (nr_frags > 16) {
+		/* Should never happen */
+		printk(KERN_WARNING "%s: Fragmentation threshold too low\n",
+			dev->name);
+		goto failed;
+	}
+
 	/* 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.) */
@@ -389,6 +396,8 @@ int ieee80211_xmit(struct sk_buff *skb, 
 		frag_hdr = (struct ieee80211_hdr *)skb_put(skb_frag, hdr_len);
 		memcpy(frag_hdr, &header, hdr_len);
 
+		frag_hdr->seq_ctl = cpu_to_le16(ieee->seq_number | i);
+
 		/* If this is not the last fragment, then add the MOREFRAGS
 		 * bit to the frame control */
 		if (i != nr_frags - 1) {
@@ -421,6 +430,11 @@ int ieee80211_xmit(struct sk_buff *skb, 
 		/* FCS */
 		skb_put(skb_frag, 4);
 	}
+	/* Sequence number is stored in bits 4 to 15 of the Sequence Control
+	 * field in 802.11 header. The seq_number field is organized the
+	 * same way so we don't need to shift while copying it to 802.11
+	 * header. */
+	ieee->seq_number += 0x10;
 
       success:
 	spin_unlock_irqrestore(&ieee->lock, flags);