[5/5] ieee80211: add sequence numbers

[Jiri Benc]

Adds sequence numbers to IEEE 802.11 headers.


Signed-off-by: Jiri Benc <jbenc@xxxxxxx>
Signed-off-by: Jirka Bohac <jbohac@xxxxxxx>

--- a/include/net/ieee80211.h
+++ b/include/net/ieee80211.h
@@ -711,6 +711,8 @@
 	unsigned int frag_next_idx;
 	u16 fts; /* Fragmentation Threshold */
 
+	u16 seq_number;	/* sequence number in transmitted frames */
+
 	/* Association info */
 	u8 bssid[IEEE80211_ALEN];
 
--- a/net/ieee80211/ieee80211_module.c
+++ b/net/ieee80211/ieee80211_module.c
@@ -333,6 +333,7 @@
 
 	/* 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;
 
--- a/net/ieee80211/ieee80211_tx.c
+++ b/net/ieee80211/ieee80211_tx.c
@@ -277,6 +277,13 @@
 	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.) */
@@ -300,6 +307,8 @@
 		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) {
@@ -324,7 +333,7 @@
 		    (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
 			skb_put(skb_frag, 4);
 	}
-
+	ieee->seq_number += 0x10;
 
  success:
 	spin_unlock_irqrestore(&ieee->lock, flags);


--
Jiri Benc
SUSE Labs
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