Commit b98ea058 authored by Saravana's avatar Saravana Committed by Johannes Berg

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: default avatarSaravana <saravanad@posedge.com>
[fix NULL pointer issues]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent a6662dba
......@@ -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);
};
......
......@@ -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;
......
......@@ -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 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
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
......
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