>If encryption is enabled, each fragment payload size is reduced by enough space
>to add the prefix and postfix (IV and ICV totalling 8 bytes in the case of WEP)
>So if you have 1500 bytes of payload with ieee->fts set to 500 without
>encryption it will take 3 frames. With WEP it will take 4 frames as the
>payload of each frame is reduced to 492 bytes.
Text is correct, but in picture (IV,payload,ICV) sits inside SNAP.
Patch corrects this.
Signed-Off-By: Denis Vlasenko <[EMAIL PROTECTED]>
Acked-By: Johannes Berg <[EMAIL PROTECTED]>
--
vda
diff -urpN softmac-snapshot/net/ieee80211/ieee80211_tx.c softmac-snapshot.1/net/ieee80211/ieee80211_tx.c
--- softmac-snapshot/net/ieee80211/ieee80211_tx.c Sun Jan 15 07:27:04 2006
+++ softmac-snapshot.1/net/ieee80211/ieee80211_tx.c Tue Jan 17 15:37:55 2006
@@ -56,7 +56,18 @@ Desc. | ctrl | dura | DA/RA | TA
`--------------------------------------------------| |------'
Total: 28 non-data bytes `----.----'
|
- .- 'Frame data' expands to <---------------------------'
+ .- 'Frame data' expands, if WEP enabled, to <----------'
+ |
+ V
+ ,-----------------------.
+Bytes | 4 | 0-2296 | 4 |
+ |-----|-----------|-----|
+Desc. | IV | Encrypted | ICV |
+ | | Packet | |
+ `-----| |-----'
+ `-----.-----'
+ |
+ .- 'Encrypted Packet' expands to
|
V
,---------------------------------------------------.
@@ -65,18 +76,7 @@ Bytes | 1 | 1 | 1 | 3
Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP |
| DSAP | SSAP | | | | Packet |
| 0xAA | 0xAA |0x03 (UI)|0x00-00-F8| | |
- `-----------------------------------------| |
-Total: 8 non-data bytes `----.----'
- |
- .- 'IP Packet' expands, if WEP enabled, to <--'
- |
- V
- ,-----------------------.
-Bytes | 4 | 0-2296 | 4 |
- |-----|-----------|-----|
-Desc. | IV | Encrypted | ICV |
- | | IP Packet | |
- `-----------------------'
+ `----------------------------------------------------
Total: 8 non-data bytes
802.3 Ethernet Data Frame
