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mac80211: fix monitor mode tx radiotap header handling 

When an injected frame gets buffered for a powersave STA or filtered
and retransmitted, mac80211 attempts to parse the radiotap header
again, which doesn't work because it's gone at that point.
This patch adds a new flag for checking the availability of a radiotap
header, so that it only attempts to parse it once, reusing the tx info
on the next call to ieee80211_tx().
This fixes severe issues with rekeying in AP mode.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2010-01-31 21:56:25 +01:00 committed by John W. Linville
parent 4754ffd68b
commit 17ad353b8d
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/mac80211.h
View File

@ -275,6 +275,8 @@ struct ieee80211_bss_conf {
* @IEEE80211_TX_INTFL_RETRANSMISSION: This frame is being retransmitted
* after TX status because the destination was asleep, it must not
* be modified again (no seqno assignment, crypto, etc.)
* @IEEE80211_TX_INTFL_HAS_RADIOTAP: This frame was injected and still
* has a radiotap header at skb->data.
*/
enum mac80211_tx_control_flags {
IEEE80211_TX_CTL_REQ_TX_STATUS = BIT(0),
@ -296,6 +298,7 @@ enum mac80211_tx_control_flags {
IEEE80211_TX_CTL_PSPOLL_RESPONSE = BIT(17),
IEEE80211_TX_CTL_MORE_FRAMES = BIT(18),
IEEE80211_TX_INTFL_RETRANSMISSION = BIT(19),
IEEE80211_TX_INTFL_HAS_RADIOTAP = BIT(20),
};
/**

6
net/mac80211/tx.c
View File

@ -1108,7 +1108,7 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
tx->flags |= IEEE80211_TX_FRAGMENTED;
/* process and remove the injection radiotap header */
if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
if (!__ieee80211_parse_tx_radiotap(tx, skb))
return TX_DROP;
@ -1117,6 +1117,7 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
* the radiotap header that was present and pre-filled
* 'tx' with tx control information.
*/
info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
}
/*
@ -1499,7 +1500,8 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
int hdrlen;
u16 len_rthdr;
info->flags |= IEEE80211_TX_CTL_INJECTED;
info->flags |= IEEE80211_TX_CTL_INJECTED |
IEEE80211_TX_INTFL_HAS_RADIOTAP;
len_rthdr = ieee80211_get_radiotap_len(skb->data);
hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);