Adds sequence numbers to IEEE 802.11 headers.
Signed-off-by: Jiri Benc <[email protected]>
Signed-off-by: Jirka Bohac <[email protected]>
--- 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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