diff options
| author | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2011-05-01 01:45:26 +0000 |
|---|---|---|
| committer | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2011-05-01 01:45:26 +0000 |
| commit | d75d999a720d07495811415ca129727f69c94843 (patch) | |
| tree | 92bc5385ca6f5673d00a97153fec2efc2c8e729e /package/mac80211 | |
| parent | 44370d22ed7d75d197e54f1c53df617231224bd8 (diff) | |
mac80211: detect and drop incoming packets with invalid CCMP packet numbers to fix connection hangs on some devices
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26795 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'package/mac80211')
| -rw-r--r-- | package/mac80211/patches/420-mac80211_ignore_invalid_ccmp_rx_pn.patch | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/package/mac80211/patches/420-mac80211_ignore_invalid_ccmp_rx_pn.patch b/package/mac80211/patches/420-mac80211_ignore_invalid_ccmp_rx_pn.patch new file mode 100644 index 0000000000..4d0f861344 --- /dev/null +++ b/package/mac80211/patches/420-mac80211_ignore_invalid_ccmp_rx_pn.patch @@ -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 */ |