Bluetooth: Convert LTK list to RCU
This patch set converts the hdev->long_term_keys list to use RCU to eliminate the need to use hci_dev_lock/unlock. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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3e64b7bd82
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@ -108,6 +108,7 @@ struct smp_csrk {
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struct smp_ltk {
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struct list_head list;
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struct rcu_head rcu;
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bdaddr_t bdaddr;
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u8 bdaddr_type;
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u8 authenticated;
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@ -778,17 +778,15 @@ static const struct file_operations identity_resolving_keys_fops = {
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static int long_term_keys_show(struct seq_file *f, void *ptr)
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{
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struct hci_dev *hdev = f->private;
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struct list_head *p, *n;
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struct smp_ltk *ltk;
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hci_dev_lock(hdev);
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list_for_each_safe(p, n, &hdev->long_term_keys) {
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struct smp_ltk *ltk = list_entry(p, struct smp_ltk, list);
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rcu_read_lock();
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list_for_each_entry_rcu(ltk, &hdev->long_term_keys, list)
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seq_printf(f, "%pMR (type %u) %u 0x%02x %u %.4x %.16llx %*phN\n",
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<k->bdaddr, ltk->bdaddr_type, ltk->authenticated,
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ltk->type, ltk->enc_size, __le16_to_cpu(ltk->ediv),
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__le64_to_cpu(ltk->rand), 16, ltk->val);
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}
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hci_dev_unlock(hdev);
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rcu_read_unlock();
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return 0;
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}
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@ -3106,11 +3104,11 @@ void hci_link_keys_clear(struct hci_dev *hdev)
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void hci_smp_ltks_clear(struct hci_dev *hdev)
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{
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struct smp_ltk *k, *tmp;
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struct smp_ltk *k;
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list_for_each_entry_safe(k, tmp, &hdev->long_term_keys, list) {
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list_del(&k->list);
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kfree(k);
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list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
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list_del_rcu(&k->list);
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kfree_rcu(k, rcu);
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}
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}
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@ -3184,15 +3182,18 @@ struct smp_ltk *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, __le64 rand,
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{
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struct smp_ltk *k;
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list_for_each_entry(k, &hdev->long_term_keys, list) {
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rcu_read_lock();
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list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
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if (k->ediv != ediv || k->rand != rand)
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continue;
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if (ltk_role(k->type) != role)
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continue;
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rcu_read_unlock();
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return k;
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}
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rcu_read_unlock();
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return NULL;
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}
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@ -3202,11 +3203,16 @@ struct smp_ltk *hci_find_ltk_by_addr(struct hci_dev *hdev, bdaddr_t *bdaddr,
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{
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struct smp_ltk *k;
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list_for_each_entry(k, &hdev->long_term_keys, list)
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rcu_read_lock();
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list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
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if (addr_type == k->bdaddr_type &&
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bacmp(bdaddr, &k->bdaddr) == 0 &&
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ltk_role(k->type) == role)
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ltk_role(k->type) == role) {
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rcu_read_unlock();
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return k;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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@ -3309,7 +3315,7 @@ struct smp_ltk *hci_add_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr,
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key = kzalloc(sizeof(*key), GFP_KERNEL);
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if (!key)
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return NULL;
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list_add(&key->list, &hdev->long_term_keys);
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list_add_rcu(&key->list, &hdev->long_term_keys);
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}
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bacpy(&key->bdaddr, bdaddr);
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@ -3365,17 +3371,17 @@ int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
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int hci_remove_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 bdaddr_type)
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{
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struct smp_ltk *k, *tmp;
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struct smp_ltk *k;
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int removed = 0;
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list_for_each_entry_safe(k, tmp, &hdev->long_term_keys, list) {
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list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
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if (bacmp(bdaddr, &k->bdaddr) || k->bdaddr_type != bdaddr_type)
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continue;
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BT_DBG("%s removing %pMR", hdev->name, bdaddr);
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list_del(&k->list);
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kfree(k);
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list_del_rcu(&k->list);
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kfree_rcu(k, rcu);
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removed++;
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}
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@ -4578,8 +4578,8 @@ static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
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*/
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if (ltk->type == SMP_STK) {
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set_bit(HCI_CONN_STK_ENCRYPT, &conn->flags);
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list_del(<k->list);
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kfree(ltk);
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list_del_rcu(<k->list);
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kfree_rcu(ltk, rcu);
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} else {
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clear_bit(HCI_CONN_STK_ENCRYPT, &conn->flags);
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}
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@ -383,13 +383,13 @@ static void smp_chan_destroy(struct l2cap_conn *conn)
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/* If pairing failed clean up any keys we might have */
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if (!complete) {
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if (smp->ltk) {
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list_del(&smp->ltk->list);
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kfree(smp->ltk);
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list_del_rcu(&smp->ltk->list);
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kfree_rcu(smp->ltk, rcu);
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}
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if (smp->slave_ltk) {
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list_del(&smp->slave_ltk->list);
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kfree(smp->slave_ltk);
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list_del_rcu(&smp->slave_ltk->list);
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kfree_rcu(smp->slave_ltk, rcu);
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}
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if (smp->remote_irk) {
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@ -1321,7 +1321,6 @@ static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
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skb_pull(skb, sizeof(*rp));
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hci_dev_lock(hdev);
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authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
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ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
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authenticated, smp->tk, smp->enc_key_size,
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@ -1329,7 +1328,6 @@ static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
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smp->ltk = ltk;
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if (!(smp->remote_key_dist & KEY_DIST_MASK))
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smp_distribute_keys(smp);
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hci_dev_unlock(hdev);
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return 0;
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}
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