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mac80211: allow drivers to access key sequence counter

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In order to implement GTK rekeying, the device needs
to be able to encrypt frames with the right PN/IV and
check the PN/IV in RX frames. To be able to tell it
about all those counters, we need to be able to get
them from mac80211, this adds the required API.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2011-07-07 18:58:00 +02:00
committed by John W. Linville
parent 9e26297a56
commit 3ea542d3c2
3 changed files with 137 additions and 2 deletions
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60
include/net/mac80211.h
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@@ -2591,6 +2591,66 @@ void ieee80211_get_tkip_p1k(struct ieee80211_key_conf *keyconf,
void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
struct sk_buff *skb, u8 *p2k);
/**
* struct ieee80211_key_seq - key sequence counter
*
* @tkip: TKIP data, containing IV32 and IV16 in host byte order
* @ccmp: PN data, most significant byte first (big endian,
* reverse order than in packet)
* @aes_cmac: PN data, most significant byte first (big endian,
* reverse order than in packet)
*/
struct ieee80211_key_seq {
union {
struct {
u32 iv32;
u16 iv16;
} tkip;
struct {
u8 pn[6];
} ccmp;
struct {
u8 pn[6];
} aes_cmac;
};
};
/**
* ieee80211_get_key_tx_seq - get key TX sequence counter
*
* @keyconf: the parameter passed with the set key
* @seq: buffer to receive the sequence data
*
* This function allows a driver to retrieve the current TX IV/PN
* for the given key. It must not be called if IV generation is
* offloaded to the device.
*
* Note that this function may only be called when no TX processing
* can be done concurrently, for example when queues are stopped
* and the stop has been synchronized.
*/
void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
struct ieee80211_key_seq *seq);
/**
* ieee80211_get_key_rx_seq - get key RX sequence counter
*
* @keyconf: the parameter passed with the set key
* @tid: The TID, or -1 for the management frame value (CCMP only);
* the value on TID 0 is also used for non-QoS frames. For
* CMAC, only TID 0 is valid.
* @seq: buffer to receive the sequence data
*
* This function allows a driver to retrieve the current RX IV/PNs
* for the given key. It must not be called if IV checking is done
* by the device and not by mac80211.
*
* Note that this function may only be called when no RX processing
* can be done concurrently.
*/
void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
int tid, struct ieee80211_key_seq *seq);
/**
* ieee80211_gtk_rekey_notify - notify userspace supplicant of rekeying
* @vif: virtual interface the rekeying was done on