Bluetooth: Add support for set_powered management command

This patch adds a set_powered command to the management interface
through which the powered state of local adapters can be controlled.

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 32e11b3..2d046e0 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -667,7 +667,8 @@ void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode);
 void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data);
 
 /* ----- HCI Sockets ----- */
-void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb);
+void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb,
+                                                       struct sock *skip_sk);
 
 /* Management interface */
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t len);

diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 0ac1520..81ef789 100644 (file)
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -58,6 +58,16 @@ struct mgmt_rp_read_info {
        __u16 hci_rev;
 } __packed;
 
+#define MGMT_OP_SET_POWERED            0x0005
+struct mgmt_cp_set_powered {
+       __le16 index;
+       __u8 powered;
+} __packed;
+struct mgmt_rp_set_powered {
+       __le16 index;
+       __u8 powered;
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE           0x0001
 struct mgmt_ev_cmd_complete {
        __le16 opcode;

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index c5a78e7..dfc4ef9 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1377,7 +1377,7 @@ static int hci_send_frame(struct sk_buff *skb)
                /* Time stamp */
                __net_timestamp(skb);
 
-               hci_send_to_sock(hdev, skb);
+               hci_send_to_sock(hdev, skb, NULL);
        }
 
        /* Get rid of skb owner, prior to sending to the driver. */
@@ -1767,7 +1767,7 @@ static void hci_rx_task(unsigned long arg)
        while ((skb = skb_dequeue(&hdev->rx_q))) {
                if (atomic_read(&hdev->promisc)) {
                        /* Send copy to the sockets */
-                       hci_send_to_sock(hdev, skb);
+                       hci_send_to_sock(hdev, skb, NULL);
                }
 
                if (test_bit(HCI_RAW, &hdev->flags)) {

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index a290854..d42fb35 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2083,6 +2083,6 @@ void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
 
        bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
        skb->dev = (void *) hdev;
-       hci_send_to_sock(hdev, skb);
+       hci_send_to_sock(hdev, skb, NULL);
        kfree_skb(skb);
 }

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 29827c7..d50e961 100644 (file)
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -85,7 +85,8 @@ static struct bt_sock_list hci_sk_list = {
 };
 
 /* Send frame to RAW socket */
-void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
+void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb,
+                                                       struct sock *skip_sk)
 {
        struct sock *sk;
        struct hlist_node *node;
@@ -97,6 +98,9 @@ void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
                struct hci_filter *flt;
                struct sk_buff *nskb;
 
+               if (sk == skip_sk)
+                       continue;
+
                if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
                        continue;
 

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index f746e19..b65b6ca 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -32,6 +32,16 @@
 #define MGMT_VERSION   0
 #define MGMT_REVISION  1
 
+struct pending_cmd {
+       struct list_head list;
+       __u16 opcode;
+       int index;
+       void *cmd;
+       struct sock *sk;
+};
+
+LIST_HEAD(cmd_list);
+
 static int cmd_status(struct sock *sk, u16 cmd, u8 status)
 {
        struct sk_buff *skb;
@@ -220,6 +230,129 @@ static int read_controller_info(struct sock *sk, unsigned char *data, u16 len)
        return 0;
 }
 
+static void mgmt_pending_free(struct pending_cmd *cmd)
+{
+       sock_put(cmd->sk);
+       kfree(cmd->cmd);
+       kfree(cmd);
+}
+
+static int mgmt_pending_add(struct sock *sk, u16 opcode, int index,
+                                                       void *data, u16 len)
+{
+       struct pending_cmd *cmd;
+
+       cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
+       if (!cmd)
+               return -ENOMEM;
+
+       cmd->opcode = opcode;
+       cmd->index = index;
+
+       cmd->cmd = kmalloc(len, GFP_ATOMIC);
+       if (!cmd->cmd) {
+               kfree(cmd);
+               return -ENOMEM;
+       }
+
+       memcpy(cmd->cmd, data, len);
+
+       cmd->sk = sk;
+       sock_hold(sk);
+
+       list_add(&cmd->list, &cmd_list);
+
+       return 0;
+}
+
+static void mgmt_pending_foreach(u16 opcode, int index,
+                               void (*cb)(struct pending_cmd *cmd, void *data),
+                               void *data)
+{
+       struct list_head *p, *n;
+
+       list_for_each_safe(p, n, &cmd_list) {
+               struct pending_cmd *cmd;
+
+               cmd = list_entry(p, struct pending_cmd, list);
+
+               if (cmd->opcode != opcode)
+                       continue;
+
+               if (index >= 0 && cmd->index != index)
+                       continue;
+
+               cb(cmd, data);
+       }
+}
+
+static struct pending_cmd *mgmt_pending_find(u16 opcode, int index)
+{
+       struct list_head *p;
+
+       list_for_each(p, &cmd_list) {
+               struct pending_cmd *cmd;
+
+               cmd = list_entry(p, struct pending_cmd, list);
+
+               if (cmd->opcode != opcode)
+                       continue;
+
+               if (index >= 0 && cmd->index != index)
+                       continue;
+
+               return cmd;
+       }
+
+       return NULL;
+}
+
+static int set_powered(struct sock *sk, unsigned char *data, u16 len)
+{
+       struct mgmt_cp_set_powered *cp;
+       struct hci_dev *hdev;
+       u16 dev_id;
+       int ret, up;
+
+       cp = (void *) data;
+       dev_id = get_unaligned_le16(&cp->index);
+
+       BT_DBG("request for hci%u", dev_id);
+
+       hdev = hci_dev_get(dev_id);
+       if (!hdev)
+               return cmd_status(sk, MGMT_OP_SET_POWERED, ENODEV);
+
+       hci_dev_lock_bh(hdev);
+
+       up = test_bit(HCI_UP, &hdev->flags);
+       if ((cp->powered && up) || (!cp->powered && !up)) {
+               ret = cmd_status(sk, MGMT_OP_SET_POWERED, EALREADY);
+               goto failed;
+       }
+
+       if (mgmt_pending_find(MGMT_OP_SET_POWERED, dev_id)) {
+               ret = cmd_status(sk, MGMT_OP_SET_POWERED, EBUSY);
+               goto failed;
+       }
+
+       ret = mgmt_pending_add(sk, MGMT_OP_SET_POWERED, dev_id, data, len);
+       if (ret < 0)
+               goto failed;
+
+       if (cp->powered)
+               queue_work(hdev->workqueue, &hdev->power_on);
+       else
+               queue_work(hdev->workqueue, &hdev->power_off);
+
+       ret = 0;
+
+failed:
+       hci_dev_unlock_bh(hdev);
+       hci_dev_put(hdev);
+       return ret;
+}
+
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 {
        unsigned char *buf;
@@ -260,6 +393,9 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
        case MGMT_OP_READ_INFO:
                err = read_controller_info(sk, buf + sizeof(*hdr), len);
                break;
+       case MGMT_OP_SET_POWERED:
+               err = set_powered(sk, buf + sizeof(*hdr), len);
+               break;
        default:
                BT_DBG("Unknown op %u", opcode);
                err = cmd_status(sk, opcode, 0x01);
@@ -276,7 +412,7 @@ done:
        return err;
 }
 
-static int mgmt_event(u16 event, void *data, u16 data_len)
+static int mgmt_event(u16 event, void *data, u16 data_len, struct sock *skip_sk)
 {
        struct sk_buff *skb;
        struct mgmt_hdr *hdr;
@@ -293,7 +429,7 @@ static int mgmt_event(u16 event, void *data, u16 data_len)
 
        memcpy(skb_put(skb, data_len), data, data_len);
 
-       hci_send_to_sock(NULL, skb);
+       hci_send_to_sock(NULL, skb, skip_sk);
        kfree_skb(skb);
 
        return 0;
@@ -305,7 +441,7 @@ int mgmt_index_added(u16 index)
 
        put_unaligned_le16(index, &ev.index);
 
-       return mgmt_event(MGMT_EV_INDEX_ADDED, &ev, sizeof(ev));
+       return mgmt_event(MGMT_EV_INDEX_ADDED, &ev, sizeof(ev), NULL);
 }
 
 int mgmt_index_removed(u16 index)
@@ -314,15 +450,69 @@ int mgmt_index_removed(u16 index)
 
        put_unaligned_le16(index, &ev.index);
 
-       return mgmt_event(MGMT_EV_INDEX_REMOVED, &ev, sizeof(ev));
+       return mgmt_event(MGMT_EV_INDEX_REMOVED, &ev, sizeof(ev), NULL);
+}
+
+struct powered_lookup {
+       u8 powered;
+       struct sock *sk;
+};
+
+static void power_rsp(struct pending_cmd *cmd, void *data)
+{
+       struct mgmt_hdr *hdr;
+       struct mgmt_ev_cmd_complete *ev;
+       struct mgmt_rp_set_powered *rp;
+       struct mgmt_cp_set_powered *cp = cmd->cmd;
+       struct sk_buff *skb;
+       struct powered_lookup *match = data;
+
+       if (cp->powered != match->powered)
+               return;
+
+       skb = alloc_skb(sizeof(*hdr) + sizeof(*ev) + sizeof(*rp), GFP_ATOMIC);
+       if (!skb)
+               return;
+
+       hdr = (void *) skb_put(skb, sizeof(*hdr));
+       hdr->opcode = cpu_to_le16(MGMT_EV_CMD_COMPLETE);
+       hdr->len = cpu_to_le16(sizeof(*ev) + sizeof(*rp));
+
+       ev = (void *) skb_put(skb, sizeof(*ev));
+       put_unaligned_le16(cmd->opcode, &ev->opcode);
+
+       rp = (void *) skb_put(skb, sizeof(*rp));
+       put_unaligned_le16(cmd->index, &rp->index);
+       rp->powered = cp->powered;
+
+       if (sock_queue_rcv_skb(cmd->sk, skb) < 0)
+               kfree_skb(skb);
+
+       list_del(&cmd->list);
+
+       if (match->sk == NULL) {
+               match->sk = cmd->sk;
+               sock_hold(match->sk);
+       }
+
+       mgmt_pending_free(cmd);
 }
 
 int mgmt_powered(u16 index, u8 powered)
 {
        struct mgmt_ev_powered ev;
+       struct powered_lookup match = { powered, NULL };
+       int ret;
 
        put_unaligned_le16(index, &ev.index);
        ev.powered = powered;
 
-       return mgmt_event(MGMT_EV_POWERED, &ev, sizeof(ev));
+       mgmt_pending_foreach(MGMT_OP_SET_POWERED, index, power_rsp, &match);
+
+       ret = mgmt_event(MGMT_EV_POWERED, &ev, sizeof(ev), match.sk);
+
+       if (match.sk)
+               sock_put(match.sk);
+
+       return ret;
 }