diff options
| author | Saravana <saravanad@posedge.com> | 2012-12-04 19:47:42 +0530 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2012-12-05 09:44:41 +0100 |
| commit | b98ea05861d76f458029096e8b2939fcb58e9530 (patch) | |
| tree | a12b1993b0495a2c5f980f14ea94553ccae2b24e /net | |
| parent | a6662dbae0b3a7a91317ec88b5aa0cf8d716f183 (diff) | |
| download | lwn-b98ea05861d76f458029096e8b2939fcb58e9530.tar.gz lwn-b98ea05861d76f458029096e8b2939fcb58e9530.zip | |
mac80211: add debug file for mic failure
The mic failure count provides the number of mic failures that
have happened on a given key (without a countermeasure being
started, since that would remove the key).
Signed-off-by: Saravana <saravanad@posedge.com>
[fix NULL pointer issues]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/debugfs_key.c | 17 | ||||
| -rw-r--r-- | net/mac80211/key.h | 3 | ||||
| -rw-r--r-- | net/mac80211/wpa.c | 5 |
3 files changed, 24 insertions, 1 deletions
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c index 2d4235497f1b..c3a3082b72e5 100644 --- a/net/mac80211/debugfs_key.c +++ b/net/mac80211/debugfs_key.c @@ -199,6 +199,22 @@ static ssize_t key_icverrors_read(struct file *file, char __user *userbuf, } KEY_OPS(icverrors); +static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct ieee80211_key *key = file->private_data; + char buf[20]; + int len; + + if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP) + return -EINVAL; + + len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures); + + return simple_read_from_buffer(userbuf, count, ppos, buf, len); +} +KEY_OPS(mic_failures); + static ssize_t key_key_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { @@ -260,6 +276,7 @@ void ieee80211_debugfs_key_add(struct ieee80211_key *key) DEBUGFS_ADD(rx_spec); DEBUGFS_ADD(replays); DEBUGFS_ADD(icverrors); + DEBUGFS_ADD(mic_failures); DEBUGFS_ADD(key); DEBUGFS_ADD(ifindex); }; diff --git a/net/mac80211/key.h b/net/mac80211/key.h index 7cff0d3a519c..382dc44ed330 100644 --- a/net/mac80211/key.h +++ b/net/mac80211/key.h @@ -81,6 +81,9 @@ struct ieee80211_key { /* last received RSC */ struct tkip_ctx rx[IEEE80211_NUM_TIDS]; + + /* number of mic failures */ + u32 mic_failures; } tkip; struct { atomic64_t tx_pn; diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c index 8bd2f5c6a56e..c175ee866ff4 100644 --- a/net/mac80211/wpa.c +++ b/net/mac80211/wpa.c @@ -104,7 +104,7 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) */ if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { if (status->flag & RX_FLAG_MMIC_ERROR) - goto mic_fail; + goto mic_fail_no_key; if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) @@ -161,6 +161,9 @@ update_iv: return RX_CONTINUE; mic_fail: + rx->key->u.tkip.mic_failures++; + +mic_fail_no_key: /* * In some cases the key can be unset - e.g. a multicast packet, in * a driver that supports HW encryption. Send up the key idx only if |