From c237899d1f8c5bfcfc9d6204052e0e065827ff75 Mon Sep 17 00:00:00 2001 From: Michael Wu Date: Tue, 30 Oct 2007 16:50:05 -0400 Subject: ieee80211: Add IEEE80211_MAX_FRAME_LEN to linux/ieee80211.h This patch adds IEEE80211_MAX_FRAME_LEN which is useful for drivers trying to determine how much to allocate for their RX buffers. It also updates the comment on IEEE80211_MAX_DATA_LEN based on revisions in 802.11e. IEEE80211_MAX_FRAG_THRESHOLD and IEEE80211_MAX_RTS_THRESHOLD are also revised due to the new maximum frame size. Signed-off-by: Michael Wu Signed-off-by: John W. Linville Signed-off-by: David S. Miller --- include/linux/ieee80211.h | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'include/linux') diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 30621c27159..214821af3d5 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -81,18 +81,18 @@ /* miscellaneous IEEE 802.11 constants */ -#define IEEE80211_MAX_FRAG_THRESHOLD 2346 -#define IEEE80211_MAX_RTS_THRESHOLD 2347 +#define IEEE80211_MAX_FRAG_THRESHOLD 2352 +#define IEEE80211_MAX_RTS_THRESHOLD 2353 #define IEEE80211_MAX_AID 2007 #define IEEE80211_MAX_TIM_LEN 251 -#define IEEE80211_MAX_DATA_LEN 2304 /* Maximum size for the MA-UNITDATA primitive, 802.11 standard section 6.2.1.1.2. - The figure in section 7.1.2 suggests a body size of up to 2312 - bytes is allowed, which is a bit confusing, I suspect this - represents the 2304 bytes of real data, plus a possible 8 bytes of - WEP IV and ICV. (this interpretation suggested by Ramiro Barreiro) */ + 802.11e clarifies the figure in section 7.1.2. The frame body is + up to 2304 octets long (maximum MSDU size) plus any crypt overhead. */ +#define IEEE80211_MAX_DATA_LEN 2304 +/* 30 byte 4 addr hdr, 2 byte QoS, 2304 byte MSDU, 12 byte crypt, 4 byte FCS */ +#define IEEE80211_MAX_FRAME_LEN 2352 #define IEEE80211_MAX_SSID_LEN 32 -- cgit v1.2.3-70-g09d2