| 1 | --- a/net/mac80211/key.h |
| 2 | +++ b/net/mac80211/key.h |
| 3 | @@ -86,6 +86,7 @@ struct ieee80211_key { |
| 4 | * Management frames. |
| 5 | */ |
| 6 | u8 rx_pn[NUM_RX_DATA_QUEUES + 1][6]; |
| 7 | + u8 rx_invalid_pn[NUM_RX_DATA_QUEUES + 1]; |
| 8 | struct crypto_cipher *tfm; |
| 9 | u32 replays; /* dot11RSNAStatsCCMPReplays */ |
| 10 | /* scratch buffers for virt_to_page() (crypto API) */ |
| 11 | --- a/net/mac80211/wpa.c |
| 12 | +++ b/net/mac80211/wpa.c |
| 13 | @@ -407,6 +407,13 @@ ieee80211_crypto_ccmp_encrypt(struct iee |
| 14 | return TX_CONTINUE; |
| 15 | } |
| 16 | |
| 17 | +static inline u64 pn_to_u64(u8 *data) |
| 18 | +{ |
| 19 | + u64 pn = get_unaligned_be32(data + 2); |
| 20 | + pn |= ((u64) get_unaligned_be16(data)) << 32; |
| 21 | + return pn; |
| 22 | +} |
| 23 | + |
| 24 | |
| 25 | ieee80211_rx_result |
| 26 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
| 27 | @@ -419,6 +426,7 @@ ieee80211_crypto_ccmp_decrypt(struct iee |
| 28 | u8 pn[CCMP_PN_LEN]; |
| 29 | int data_len; |
| 30 | int queue; |
| 31 | + u64 diff; |
| 32 | |
| 33 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 34 | |
| 35 | @@ -452,6 +460,11 @@ ieee80211_crypto_ccmp_decrypt(struct iee |
| 36 | return RX_DROP_UNUSABLE; |
| 37 | } |
| 38 | |
| 39 | + diff = pn_to_u64(pn) - pn_to_u64(key->u.ccmp.rx_pn[queue]); |
| 40 | + if (diff > 1000 && key->u.ccmp.rx_invalid_pn[queue]++ < 10) |
| 41 | + return RX_DROP_UNUSABLE; |
| 42 | + |
| 43 | + key->u.ccmp.rx_invalid_pn[queue] = 0; |
| 44 | memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN); |
| 45 | |
| 46 | /* Remove CCMP header and MIC */ |
| 47 | |
