rt2x00: Implement HW encryption

Various rt2x00 devices support hardware encryption.

Most of them require the IV/EIV to be generated by mac80211,
but require it to be provided seperately instead of within
the frame itself. This means that rt2x00lib should extract
the data from the frame and place it in the frame descriptor.
During RX the IV/EIV is provided in the descriptor by the
hardware which means that it should be inserted into the
frame by rt2x00lib.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
index 6bee1d611bbf..5cf4c859e39d 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -35,6 +35,13 @@
 
 #define MAX_LINE_LENGTH 64
 
+struct rt2x00debug_crypto {
+        unsigned long success;
+        unsigned long icv_error;
+        unsigned long mic_error;
+        unsigned long key_error;
+};
+
 struct rt2x00debug_intf {
         /*
          * Pointer to driver structure where
@@ -63,6 +70,7 @@ struct rt2x00debug_intf {
          *   - queue folder
          *     - frame dump file
          *     - queue stats file
+         *     - crypto stats file
          */
         struct dentry *driver_folder;
         struct dentry *driver_entry;
@@ -80,6 +88,7 @@ struct rt2x00debug_intf {
         struct dentry *queue_folder;
         struct dentry *queue_frame_dump_entry;
         struct dentry *queue_stats_entry;
+        struct dentry *crypto_stats_entry;
 
         /*
          * The frame dump file only allows a single reader,
@@ -98,6 +107,12 @@ struct rt2x00debug_intf {
         wait_queue_head_t frame_dump_waitqueue;
 
         /*
+         * HW crypto statistics.
+         * All statistics are stored seperately per cipher type.
+         */
+        struct rt2x00debug_crypto crypto_stats[CIPHER_MAX];
+
+        /*
          * Driver and chipset files will use a data buffer
          * that has been created in advance. This will simplify
          * the code since we can use the debugfs functions.
@@ -114,6 +129,25 @@ struct rt2x00debug_intf {
         unsigned int offset_rf;
 };
 
+void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
+                               enum cipher cipher, enum rx_crypto status)
+{
+        struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
+
+        if (cipher == CIPHER_TKIP_NO_MIC)
+                cipher = CIPHER_TKIP;
+        if (cipher == CIPHER_NONE || cipher > CIPHER_MAX)
+                return;
+
+        /* Remove CIPHER_NONE index */
+        cipher--;
+
+        intf->crypto_stats[cipher].success += (status == RX_CRYPTO_SUCCESS);
+        intf->crypto_stats[cipher].icv_error += (status == RX_CRYPTO_FAIL_ICV);
+        intf->crypto_stats[cipher].mic_error += (status == RX_CRYPTO_FAIL_MIC);
+        intf->crypto_stats[cipher].key_error += (status == RX_CRYPTO_FAIL_KEY);
+}
+
 void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
                             enum rt2x00_dump_type type, struct sk_buff *skb)
 {
@@ -327,6 +361,59 @@ static const struct file_operations rt2x00debug_fop_queue_stats = {
         .release        = rt2x00debug_file_release,
 };
 
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+static ssize_t rt2x00debug_read_crypto_stats(struct file *file,
+                                             char __user *buf,
+                                             size_t length,
+                                             loff_t *offset)
+{
+        struct rt2x00debug_intf *intf = file->private_data;
+        char *name[] = { "WEP64", "WEP128", "TKIP", "AES" };
+        char *data;
+        char *temp;
+        size_t size;
+        unsigned int i;
+
+        if (*offset)
+                return 0;
+
+        data = kzalloc((1 + CIPHER_MAX)* MAX_LINE_LENGTH, GFP_KERNEL);
+        if (!data)
+                return -ENOMEM;
+
+        temp = data;
+        temp += sprintf(data, "cipher\tsuccess\ticv err\tmic err\tkey err\n");
+
+        for (i = 0; i < CIPHER_MAX; i++) {
+                temp += sprintf(temp, "%s\t%lu\t%lu\t%lu\t%lu\n", name[i],
+                                intf->crypto_stats[i].success,
+                                intf->crypto_stats[i].icv_error,
+                                intf->crypto_stats[i].mic_error,
+                                intf->crypto_stats[i].key_error);
+        }
+
+        size = strlen(data);
+        size = min(size, length);
+
+        if (copy_to_user(buf, data, size)) {
+                kfree(data);
+                return -EFAULT;
+        }
+
+        kfree(data);
+
+        *offset += size;
+        return size;
+}
+
+static const struct file_operations rt2x00debug_fop_crypto_stats = {
+        .owner          = THIS_MODULE,
+        .read           = rt2x00debug_read_crypto_stats,
+        .open           = rt2x00debug_file_open,
+        .release        = rt2x00debug_file_release,
+};
+#endif
+
 #define RT2X00DEBUGFS_OPS_READ(__name, __format, __type)        \
 static ssize_t rt2x00debug_read_##__name(struct file *file,     \
                                          char __user *buf,      \
@@ -569,6 +656,13 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
             debugfs_create_file("queue", S_IRUSR, intf->queue_folder,
                                 intf, &rt2x00debug_fop_queue_stats);
 
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+        if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
+                intf->crypto_stats_entry =
+                    debugfs_create_file("crypto", S_IRUGO, intf->queue_folder,
+                                        intf, &rt2x00debug_fop_crypto_stats);
+#endif
+
         return;
 
 exit:
@@ -587,6 +681,9 @@ void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
 
         skb_queue_purge(&intf->frame_dump_skbqueue);
 
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+        debugfs_remove(intf->crypto_stats_entry);
+#endif
         debugfs_remove(intf->queue_stats_entry);
         debugfs_remove(intf->queue_frame_dump_entry);
         debugfs_remove(intf->queue_folder);