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mac80211: detect and drop incoming packets with invalid CCMP packet numbers to fix connection hangs on some devices

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26795 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2011-05-01 01:45:26 +00:00
parent 44370d22ed
commit d75d999a72
1 changed files with 46 additions and 0 deletions
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46
package/mac80211/patches/420-mac80211_ignore_invalid_ccmp_rx_pn.patch Normal file
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@ -0,0 +1,46 @@
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -86,6 +86,7 @@ struct ieee80211_key {
* Management frames.
*/
u8 rx_pn[NUM_RX_DATA_QUEUES + 1][6];
+ u8 rx_invalid_pn[NUM_RX_DATA_QUEUES + 1];
struct crypto_cipher *tfm;
u32 replays; /* dot11RSNAStatsCCMPReplays */
/* scratch buffers for virt_to_page() (crypto API) */
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -407,6 +407,13 @@ ieee80211_crypto_ccmp_encrypt(struct iee
return TX_CONTINUE;
}
+static inline u64 pn_to_u64(u8 *data)
+{
+ u64 pn = get_unaligned_be32(data + 2);
+ pn |= ((u64) get_unaligned_be16(data)) << 32;
+ return pn;
+}
+
ieee80211_rx_result
ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
@@ -419,6 +426,7 @@ ieee80211_crypto_ccmp_decrypt(struct iee
u8 pn[CCMP_PN_LEN];
int data_len;
int queue;
+ u64 diff;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
@@ -452,6 +460,11 @@ ieee80211_crypto_ccmp_decrypt(struct iee
return RX_DROP_UNUSABLE;
}
+ diff = pn_to_u64(pn) - pn_to_u64(key->u.ccmp.rx_pn[queue]);
+ if (diff > 1000 && key->u.ccmp.rx_invalid_pn[queue]++ < 10)
+ return RX_DROP_UNUSABLE;
+
+ key->u.ccmp.rx_invalid_pn[queue] = 0;
memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN);
/* Remove CCMP header and MIC */