Bluetooth: mgmt: Move command handlers into a table

By moving the command handlers into a table (the index being equal to
the opcode) the lookup is made a bit more efficient. Having a struct to
describe each handler also paves the way to add more meta-data for each
handler, e.g. the minimum message size for the command and allow
handling of common tasks like this in a centralized place.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 79 insertions, 140 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index cf8c8403571e..88a342a12593 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -267,7 +267,8 @@ static int cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
         return err;
 }
 
-static int read_version(struct sock *sk)
+static int read_version(struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len)
 {
         struct mgmt_rp_read_version rp;
 
@@ -280,7 +281,8 @@ static int read_version(struct sock *sk)
                                                                 sizeof(rp));
 }
 
-static int read_commands(struct sock *sk)
+static int read_commands(struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len)
 {
         struct mgmt_rp_read_commands *rp;
         u16 num_commands = ARRAY_SIZE(mgmt_commands);
@@ -313,7 +315,8 @@ static int read_commands(struct sock *sk)
         return err;
 }
 
-static int read_index_list(struct sock *sk)
+static int read_index_list(struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len)
 {
         struct mgmt_rp_read_index_list *rp;
         struct list_head *p;
@@ -627,7 +630,8 @@ static void mgmt_init_hdev(struct sock *sk, struct hci_dev *hdev)
         }
 }
 
-static int read_controller_info(struct sock *sk, struct hci_dev *hdev)
+static int read_controller_info(struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len)
 {
         struct mgmt_rp_read_info rp;
 
@@ -1689,7 +1693,8 @@ static u8 link_to_mgmt(u8 link_type, u8 addr_type)
         }
 }
 
-static int get_connections(struct sock *sk, struct hci_dev *hdev)
+static int get_connections(struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len)
 {
         struct mgmt_rp_get_connections *rp;
         struct hci_conn *c;
@@ -2015,9 +2020,9 @@ unlock:
 }
 
 static int cancel_pair_device(struct sock *sk, struct hci_dev *hdev,
-                                                unsigned char *data, u16 len)
+                                                        void *data, u16 len)
 {
-        struct mgmt_addr_info *addr = (void *) data;
+        struct mgmt_addr_info *addr = data;
         struct pending_cmd *cmd;
         struct hci_conn *conn;
         int err;
@@ -2240,7 +2245,8 @@ failed:
         return err;
 }
 
-static int read_local_oob_data(struct sock *sk, struct hci_dev *hdev)
+static int read_local_oob_data(struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len)
 {
         struct pending_cmd *cmd;
         int err;
@@ -2718,6 +2724,53 @@ static int load_long_term_keys(struct sock *sk, struct hci_dev *hdev,
         return 0;
 }
 
+struct mgmt_handler {
+        int (*func) (struct sock *sk, struct hci_dev *hdev,
+                                                void *data, u16 data_len);
+} mgmt_handlers[] = {
+        { NULL }, /* 0x0000 (no command) */
+        { read_version, },
+        { read_commands, },
+        { read_index_list, },
+        { read_controller_info, },
+        { set_powered, },
+        { set_discoverable, },
+        { set_connectable, },
+        { set_fast_connectable, },
+        { set_pairable, },
+        { set_link_security, },
+        { set_ssp, },
+        { set_hs, },
+        { set_le, },
+        { set_dev_class, },
+        { set_local_name, },
+        { add_uuid, },
+        { remove_uuid, },
+        { load_link_keys, },
+        { load_long_term_keys, },
+        { disconnect, },
+        { get_connections, },
+        { pin_code_reply, },
+        { pin_code_neg_reply, },
+        { set_io_capability, },
+        { pair_device, },
+        { cancel_pair_device, },
+        { unpair_device, },
+        { user_confirm_reply, },
+        { user_confirm_neg_reply, },
+        { user_passkey_reply, },
+        { user_passkey_neg_reply, },
+        { read_local_oob_data, },
+        { add_remote_oob_data, },
+        { remove_remote_oob_data, },
+        { start_discovery, },
+        { stop_discovery, },
+        { confirm_name, },
+        { block_device, },
+        { unblock_device, },
+};
+
+
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 {
         void *buf;
@@ -2751,150 +2804,36 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
                 goto done;
         }
 
-        if (opcode < MGMT_OP_READ_INFO) {
-                if (index != MGMT_INDEX_NONE) {
-                        err = cmd_status(sk, index, opcode,
-                                                MGMT_STATUS_INVALID_PARAMS);
-                        goto done;
-                }
-        } else {
+        if (index != MGMT_INDEX_NONE) {
                 hdev = hci_dev_get(index);
                 if (!hdev) {
                         err = cmd_status(sk, index, opcode,
-                                                MGMT_STATUS_INVALID_PARAMS);
+                                        MGMT_STATUS_INVALID_PARAMS);
                         goto done;
                 }
-
-                mgmt_init_hdev(sk, hdev);
         }
 
-        cp = buf + sizeof(*hdr);
-
-        switch (opcode) {
-        case MGMT_OP_READ_VERSION:
-                err = read_version(sk);
-                break;
-        case MGMT_OP_READ_COMMANDS:
-                err = read_commands(sk);
-                break;
-        case MGMT_OP_READ_INDEX_LIST:
-                err = read_index_list(sk);
-                break;
-        case MGMT_OP_READ_INFO:
-                err = read_controller_info(sk, hdev);
-                break;
-        case MGMT_OP_SET_POWERED:
-                err = set_powered(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_DISCOVERABLE:
-                err = set_discoverable(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_CONNECTABLE:
-                err = set_connectable(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_FAST_CONNECTABLE:
-                err = set_fast_connectable(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_PAIRABLE:
-                err = set_pairable(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_LINK_SECURITY:
-                err = set_link_security(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_SSP:
-                err = set_ssp(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_HS:
-                err = set_hs(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_LE:
-                err = set_le(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_ADD_UUID:
-                err = add_uuid(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_REMOVE_UUID:
-                err = remove_uuid(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_DEV_CLASS:
-                err = set_dev_class(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_LOAD_LINK_KEYS:
-                err = load_link_keys(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_DISCONNECT:
-                err = disconnect(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_GET_CONNECTIONS:
-                err = get_connections(sk, hdev);
-                break;
-        case MGMT_OP_PIN_CODE_REPLY:
-                err = pin_code_reply(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_PIN_CODE_NEG_REPLY:
-                err = pin_code_neg_reply(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_IO_CAPABILITY:
-                err = set_io_capability(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_PAIR_DEVICE:
-                err = pair_device(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_CANCEL_PAIR_DEVICE:
-                err = cancel_pair_device(sk, hdev, buf + sizeof(*hdr), len);
-                break;
-        case MGMT_OP_UNPAIR_DEVICE:
-                err = unpair_device(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_USER_CONFIRM_REPLY:
-                err = user_confirm_reply(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_USER_CONFIRM_NEG_REPLY:
-                err = user_confirm_neg_reply(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_USER_PASSKEY_REPLY:
-                err = user_passkey_reply(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_USER_PASSKEY_NEG_REPLY:
-                err = user_passkey_neg_reply(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_SET_LOCAL_NAME:
-                err = set_local_name(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_READ_LOCAL_OOB_DATA:
-                err = read_local_oob_data(sk, hdev);
-                break;
-        case MGMT_OP_ADD_REMOTE_OOB_DATA:
-                err = add_remote_oob_data(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_REMOVE_REMOTE_OOB_DATA:
-                err = remove_remote_oob_data(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_START_DISCOVERY:
-                err = start_discovery(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_STOP_DISCOVERY:
-                err = stop_discovery(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_CONFIRM_NAME:
-                err = confirm_name(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_BLOCK_DEVICE:
-                err = block_device(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_UNBLOCK_DEVICE:
-                err = unblock_device(sk, hdev, cp, len);
-                break;
-        case MGMT_OP_LOAD_LONG_TERM_KEYS:
-                err = load_long_term_keys(sk, hdev, cp, len);
-                break;
-        default:
+        if (opcode >= ARRAY_SIZE(mgmt_handlers) ||
+                                        mgmt_handlers[opcode].func == NULL) {
                 BT_DBG("Unknown op %u", opcode);
                 err = cmd_status(sk, index, opcode,
                                                 MGMT_STATUS_UNKNOWN_COMMAND);
-                break;
+                goto done;
+        }
+
+        if ((hdev && opcode < MGMT_OP_READ_INFO) ||
+                        (!hdev && opcode >= MGMT_OP_READ_INFO)) {
+                err = cmd_status(sk, index, opcode,
+                                                MGMT_STATUS_INVALID_PARAMS);
+                goto done;
         }
 
+        if (hdev)
+                mgmt_init_hdev(sk, hdev);
+
+        cp = buf + sizeof(*hdr);
+
+        err = mgmt_handlers[opcode].func(sk, hdev, cp, len);
         if (err < 0)
                 goto done;