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Bluetooth: Automate remote name requests
In Bluetooth there are no automatic updates of remote device names when they get changed on the remote side. Instead, it is a good idea to do a manual name request when a new connection gets created (for whatever reason) since at this point it is very cheap (no costly baseband connection creation needed just for the sake of the name request). So far userspace has been responsible for this extra name request but tighter control is needed in order not to flood Bluetooth controllers with two many commands during connection creation. It has been shown that some controllers simply fail to function correctly if they get too many (almost) simultaneous commands during connection creation. The simplest way to acheive better control of these commands is to move their sending completely to the kernel side. This patch inserts name requests into the sequence of events that the kernel performs during connection creation. It does this after the remote features have been successfully requested and before any pending authentication requests are performed. The code will work sub-optimally with userspace versions that still do the name requesting themselves (it shouldn't break anything though) so it is recommended to combine this with a userspace software version that doesn't have automated name requests. Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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1 changed files with 54 additions and 18 deletions
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@ -677,11 +677,9 @@ static void hci_cs_set_conn_encrypt(struct hci_dev *hdev, __u8 status)
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hci_dev_unlock(hdev);
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}
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static int hci_request_outgoing_auth(struct hci_dev *hdev,
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static int hci_outgoing_auth_needed(struct hci_dev *hdev,
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struct hci_conn *conn)
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{
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struct hci_cp_auth_requested cp;
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if (conn->state != BT_CONFIG || !conn->out)
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return 0;
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@ -694,15 +692,35 @@ static int hci_request_outgoing_auth(struct hci_dev *hdev,
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conn->sec_level != BT_SECURITY_HIGH)
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return 0;
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cp.handle = __cpu_to_le16(conn->handle);
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hci_send_cmd(hdev, HCI_OP_AUTH_REQUESTED, sizeof(cp), &cp);
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return 1;
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}
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static void hci_cs_remote_name_req(struct hci_dev *hdev, __u8 status)
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{
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struct hci_cp_remote_name_req *cp;
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struct hci_conn *conn;
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BT_DBG("%s status 0x%x", hdev->name, status);
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/* If successful wait for the name req complete event before
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* checking for the need to do authentication */
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if (!status)
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return;
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cp = hci_sent_cmd_data(hdev, HCI_OP_REMOTE_NAME_REQ);
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if (!cp)
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return;
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hci_dev_lock(hdev);
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conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &cp->bdaddr);
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if (conn && hci_outgoing_auth_needed(hdev, conn)) {
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struct hci_cp_auth_requested cp;
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cp.handle = __cpu_to_le16(conn->handle);
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hci_send_cmd(hdev, HCI_OP_AUTH_REQUESTED, sizeof(cp), &cp);
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}
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hci_dev_unlock(hdev);
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}
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static void hci_cs_read_remote_features(struct hci_dev *hdev, __u8 status)
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@ -1113,9 +1131,23 @@ static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *s
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static inline void hci_remote_name_evt(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct hci_ev_remote_name *ev = (void *) skb->data;
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struct hci_conn *conn;
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BT_DBG("%s", hdev->name);
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hci_conn_check_pending(hdev);
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hci_dev_lock(hdev);
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conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &ev->bdaddr);
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if (conn && hci_outgoing_auth_needed(hdev, conn)) {
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struct hci_cp_auth_requested cp;
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cp.handle = __cpu_to_le16(conn->handle);
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hci_send_cmd(hdev, HCI_OP_AUTH_REQUESTED, sizeof(cp), &cp);
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}
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hci_dev_unlock(hdev);
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}
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static inline void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
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@ -1179,7 +1211,6 @@ static inline void hci_remote_features_evt(struct hci_dev *hdev, struct sk_buff
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{
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struct hci_ev_remote_features *ev = (void *) skb->data;
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struct hci_conn *conn;
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int auth_requested;
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BT_DBG("%s status %d", hdev->name, ev->status);
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@ -1204,12 +1235,15 @@ static inline void hci_remote_features_evt(struct hci_dev *hdev, struct sk_buff
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goto unlock;
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}
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if (!ev->status)
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auth_requested = hci_request_outgoing_auth(hdev, conn);
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else
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auth_requested = 0;
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if (!ev->status) {
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struct hci_cp_remote_name_req cp;
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memset(&cp, 0, sizeof(cp));
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bacpy(&cp.bdaddr, &conn->dst);
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cp.pscan_rep_mode = 0x02;
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hci_send_cmd(hdev, HCI_OP_REMOTE_NAME_REQ, sizeof(cp), &cp);
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}
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if (!auth_requested) {
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if (!hci_outgoing_auth_needed(hdev, conn)) {
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conn->state = BT_CONNECTED;
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hci_proto_connect_cfm(conn, ev->status);
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hci_conn_put(conn);
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@ -1667,7 +1701,6 @@ static inline void hci_remote_ext_features_evt(struct hci_dev *hdev, struct sk_b
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{
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struct hci_ev_remote_ext_features *ev = (void *) skb->data;
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struct hci_conn *conn;
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int auth_requested;
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BT_DBG("%s", hdev->name);
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@ -1689,12 +1722,15 @@ static inline void hci_remote_ext_features_evt(struct hci_dev *hdev, struct sk_b
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if (conn->state != BT_CONFIG)
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goto unlock;
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if (!ev->status)
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auth_requested = hci_request_outgoing_auth(hdev, conn);
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else
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auth_requested = 0;
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if (!ev->status) {
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struct hci_cp_remote_name_req cp;
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memset(&cp, 0, sizeof(cp));
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bacpy(&cp.bdaddr, &conn->dst);
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cp.pscan_rep_mode = 0x02;
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hci_send_cmd(hdev, HCI_OP_REMOTE_NAME_REQ, sizeof(cp), &cp);
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}
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if (!auth_requested) {
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if (!hci_outgoing_auth_needed(hdev, conn)) {
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conn->state = BT_CONNECTED;
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hci_proto_connect_cfm(conn, ev->status);
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hci_conn_put(conn);
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