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authorSara Sharon <sara.sharon@intel.com>2016-05-03 15:59:44 +0300
committerJohannes Berg <johannes.berg@intel.com>2016-05-12 11:14:45 +0200
commitf631a77ba920f7153a1094d09cd8f2ebbffd0328 (patch)
treeb5baaab1e31664bf225c04581178efaf6e1f387a
parent20eb7ea93f7ffaaa24b19b8bfc411b1f7605759f (diff)
downloadlinux-f631a77ba920f7153a1094d09cd8f2ebbffd0328.tar.bz2
mac80211: allow same PN for AMSDU sub-frames
Some hardware (iwlwifi an example) de-aggregate AMSDUs and copy the IV as is to the generated MPDUs, so the same PN appears in multiple packets without being a replay attack. Allow driver to explicitly indicate that a frame is allowed to have the same PN as the previous frame. Signed-off-by: Sara Sharon <sara.sharon@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--include/net/mac80211.h6
-rw-r--r--net/mac80211/wpa.c16
2 files changed, 17 insertions, 5 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 07ef9378df2b..ce2f6e3be3cf 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1068,6 +1068,9 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
* @RX_FLAG_RADIOTAP_VENDOR_DATA: This frame contains vendor-specific
* radiotap data in the skb->data (before the frame) as described by
* the &struct ieee80211_vendor_radiotap.
+ * @RX_FLAG_ALLOW_SAME_PN: Allow the same PN as same packet before.
+ * This is used for AMSDU subframes which can have the same PN as
+ * the first subframe.
*/
enum mac80211_rx_flags {
RX_FLAG_MMIC_ERROR = BIT(0),
@@ -1101,7 +1104,8 @@ enum mac80211_rx_flags {
RX_FLAG_5MHZ = BIT(29),
RX_FLAG_AMSDU_MORE = BIT(30),
RX_FLAG_RADIOTAP_VENDOR_DATA = BIT(31),
- RX_FLAG_MIC_STRIPPED = BIT_ULL(32),
+ RX_FLAG_MIC_STRIPPED = BIT_ULL(32),
+ RX_FLAG_ALLOW_SAME_PN = BIT_ULL(33),
};
#define RX_FLAG_STBC_SHIFT 26
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 7e4f2652bca7..b48c1e13e281 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -519,12 +519,16 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
return RX_DROP_UNUSABLE;
if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
+ int res;
+
ccmp_hdr2pn(pn, skb->data + hdrlen);
queue = rx->security_idx;
- if (memcmp(pn, key->u.ccmp.rx_pn[queue],
- IEEE80211_CCMP_PN_LEN) <= 0) {
+ res = memcmp(pn, key->u.ccmp.rx_pn[queue],
+ IEEE80211_CCMP_PN_LEN);
+ if (res < 0 ||
+ (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
key->u.ccmp.replays++;
return RX_DROP_UNUSABLE;
}
@@ -745,12 +749,16 @@ ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
return RX_DROP_UNUSABLE;
if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
+ int res;
+
gcmp_hdr2pn(pn, skb->data + hdrlen);
queue = rx->security_idx;
- if (memcmp(pn, key->u.gcmp.rx_pn[queue],
- IEEE80211_GCMP_PN_LEN) <= 0) {
+ res = memcmp(pn, key->u.gcmp.rx_pn[queue],
+ IEEE80211_GCMP_PN_LEN);
+ if (res < 0 ||
+ (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
key->u.gcmp.replays++;
return RX_DROP_UNUSABLE;
}