diff options
| -rw-r--r-- | net/bluetooth/smp.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index d0220fb76dc0..d9ed5e8ee6a0 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -84,6 +84,7 @@ struct smp_dev { u8 local_rand[16]; bool debug_key; + u8 min_key_size; u8 max_key_size; struct crypto_blkcipher *tfm_aes; @@ -3136,6 +3137,7 @@ static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) smp->tfm_aes = tfm_aes; smp->tfm_cmac = tfm_cmac; + smp->min_key_size = SMP_MIN_ENC_KEY_SIZE; smp->max_key_size = SMP_MAX_ENC_KEY_SIZE; create_chan: @@ -3259,6 +3261,50 @@ static const struct file_operations force_bredr_smp_fops = { .llseek = default_llseek, }; +static ssize_t le_min_key_size_read(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct hci_dev *hdev = file->private_data; + char buf[4]; + + snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size); + + return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); +} + +static ssize_t le_min_key_size_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct hci_dev *hdev = file->private_data; + char buf[32]; + size_t buf_size = min(count, (sizeof(buf) - 1)); + u8 key_size; + + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + + buf[buf_size] = '\0'; + + sscanf(buf, "%hhu", &key_size); + + if (key_size > SMP_DEV(hdev)->max_key_size || + key_size < SMP_MIN_ENC_KEY_SIZE) + return -EINVAL; + + SMP_DEV(hdev)->min_key_size = key_size; + + return count; +} + +static const struct file_operations le_min_key_size_fops = { + .open = simple_open, + .read = le_min_key_size_read, + .write = le_min_key_size_write, + .llseek = default_llseek, +}; + static ssize_t le_max_key_size_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) @@ -3287,7 +3333,8 @@ static ssize_t le_max_key_size_write(struct file *file, sscanf(buf, "%hhu", &key_size); - if (key_size > SMP_MAX_ENC_KEY_SIZE || key_size < SMP_MIN_ENC_KEY_SIZE) + if (key_size > SMP_MAX_ENC_KEY_SIZE || + key_size < SMP_DEV(hdev)->min_key_size) return -EINVAL; SMP_DEV(hdev)->max_key_size = key_size; @@ -3326,6 +3373,8 @@ int smp_register(struct hci_dev *hdev) hdev->smp_data = chan; + debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev, + &le_min_key_size_fops); debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev, &le_max_key_size_fops); |