[8/9] ieee80211: add sequence numbers

[Jiri Benc <jbenc@xxxxxxx>]

Adds sequence numbers to IEEE 802.11 headers.


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

Index: netdev/include/net/ieee80211.h
===================================================================
--- netdev.orig/include/net/ieee80211.h 2005-06-03 13:21:00.000000000 +0200
+++ netdev/include/net/ieee80211.h      2005-06-03 13:21:06.000000000 +0200
@@ -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];
 
Index: netdev/net/ieee80211/ieee80211_module.c
===================================================================
--- netdev.orig/net/ieee80211/ieee80211_module.c        2005-06-03 
13:21:00.000000000 +0200
+++ netdev/net/ieee80211/ieee80211_module.c     2005-06-03 13:21:06.000000000 
+0200
@@ -128,6 +128,7 @@
 
        /* 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;
 
Index: netdev/net/ieee80211/ieee80211_tx.c
===================================================================
--- netdev.orig/net/ieee80211/ieee80211_tx.c    2005-06-03 13:21:00.000000000 
+0200
+++ netdev/net/ieee80211/ieee80211_tx.c 2005-06-03 13:21:06.000000000 +0200
@@ -276,6 +276,13 @@
        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.) */
@@ -299,6 +306,8 @@
                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) {
@@ -323,7 +332,7 @@
                    (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