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authorDenis Vlasenko <vda@ilport.com.ua>2006-01-18 12:02:33 +0200
committerJohn W. Linville <linville@tuxdriver.com>2006-01-27 17:08:06 -0500
commit44d7a8cfbdc1112fd80546591fd6f5c831ea0363 (patch)
tree87e0b6360f041847e519cd25aaa2dbc4b48cbde0 /net/ieee80211
parent4a99ac3a9ee7e1b90ebc3ddbb44db75eef5c41e6 (diff)
[PATCH] WEP fields are incorrectly shown to be INSIDE snap in the doc
>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 <vda@ilport.com.ua> Acked-By: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/ieee80211')
-rw-r--r--net/ieee80211/ieee80211_tx.c26
1 files changed, 13 insertions, 13 deletions
diff --git a/net/ieee80211/ieee80211_tx.c b/net/ieee80211/ieee80211_tx.c
index 8fdd943ebe8e..0949803b9c7d 100644
--- a/net/ieee80211/ieee80211_tx.c
+++ b/net/ieee80211/ieee80211_tx.c
@@ -56,7 +56,18 @@ Desc. | ctrl | dura | DA/RA | TA | SA | Sequ | Frame | fcs |
`--------------------------------------------------| |------'
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 | 2 | 0-2304 |
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