Bluetooth: Add initial Bluetooth Management interface callbacks

Add initial code for handling Bluetooth Management interface messages.

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Andrei Emeltchenko <andrei.emeltchenko@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

3 files changed, 133 insertions, 7 deletions

diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile
index 7ca1f46a471a..250f954f0213 100644
--- a/net/bluetooth/Makefile
+++ b/net/bluetooth/Makefile
@@ -10,4 +10,4 @@ obj-$(CONFIG_BT_BNEP)	+= bnep/
 obj-$(CONFIG_BT_CMTP)   += cmtp/
 obj-$(CONFIG_BT_HIDP)   += hidp/
 
-bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o hci_sock.o hci_sysfs.o lib.o
+bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o hci_sock.o hci_sysfs.o lib.o
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index b3753bad2a55..207be7abda9f 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -49,6 +49,8 @@
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
+static int enable_mgmt;
+
 /* ----- HCI socket interface ----- */
 
 static inline int hci_test_bit(int nr, void *addr)
@@ -353,25 +355,35 @@ static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long a
 
 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 {
-        struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
+        struct sockaddr_hci haddr;
         struct sock *sk = sock->sk;
         struct hci_dev *hdev = NULL;
-        int err = 0;
+        int len, err = 0;
 
         BT_DBG("sock %p sk %p", sock, sk);
 
-        if (!haddr || haddr->hci_family != AF_BLUETOOTH)
+        if (!addr)
+                return -EINVAL;
+
+        memset(&haddr, 0, sizeof(haddr));
+        len = min_t(unsigned int, sizeof(haddr), addr_len);
+        memcpy(&haddr, addr, len);
+
+        if (haddr.hci_family != AF_BLUETOOTH)
+                return -EINVAL;
+
+        if (haddr.hci_channel != HCI_CHANNEL_RAW && !enable_mgmt)
                 return -EINVAL;
 
         lock_sock(sk);
 
-        if (hci_pi(sk)->hdev) {
+        if (sk->sk_state == BT_BOUND || hci_pi(sk)->hdev) {
                 err = -EALREADY;
                 goto done;
         }
 
-        if (haddr->hci_dev != HCI_DEV_NONE) {
-                hdev = hci_dev_get(haddr->hci_dev);
+        if (haddr.hci_dev != HCI_DEV_NONE) {
+                hdev = hci_dev_get(haddr.hci_dev);
                 if (!hdev) {
                         err = -ENODEV;
                         goto done;
@@ -380,6 +392,7 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_le
                 atomic_inc(&hdev->promisc);
         }
 
+        hci_pi(sk)->channel = haddr.hci_channel;
         hci_pi(sk)->hdev = hdev;
         sk->sk_state = BT_BOUND;
 
@@ -502,6 +515,17 @@ static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 
         lock_sock(sk);
 
+        switch (hci_pi(sk)->channel) {
+        case HCI_CHANNEL_RAW:
+                break;
+        case HCI_CHANNEL_CONTROL:
+                err = mgmt_control(sk, msg, len);
+                goto done;
+        default:
+                err = -EINVAL;
+                goto done;
+        }
+
         hdev = hci_pi(sk)->hdev;
         if (!hdev) {
                 err = -EBADFD;
@@ -831,3 +855,6 @@ void __exit hci_sock_cleanup(void)
 
         proto_unregister(&hci_sk_proto);
 }
+
+module_param(enable_mgmt, bool, 0644);
+MODULE_PARM_DESC(enable_mgmt, "Enable Management interface");
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
new file mode 100644
index 000000000000..d15bf676c350
--- /dev/null
+++ b/net/bluetooth/mgmt.c
@@ -0,0 +1,99 @@
+/*
+   BlueZ - Bluetooth protocol stack for Linux
+   Copyright (C) 2010  Nokia Corporation
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License version 2 as
+   published by the Free Software Foundation;
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+   SOFTWARE IS DISCLAIMED.
+*/
+
+/* Bluetooth HCI Management interface */
+
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/mgmt.h>
+
+static void cmd_status(struct sock *sk, u16 cmd, u8 status)
+{
+        struct sk_buff *skb;
+        struct mgmt_hdr *hdr;
+        struct mgmt_ev_cmd_status *ev;
+
+        BT_DBG("sock %p", sk);
+
+        skb = alloc_skb(sizeof(*hdr) + sizeof(*ev), GFP_ATOMIC);
+        if (!skb)
+                return;
+
+        hdr = (void *) skb_put(skb, sizeof(*hdr));
+
+        hdr->opcode = cpu_to_le16(MGMT_EV_CMD_STATUS);
+        hdr->len = cpu_to_le16(sizeof(*ev));
+
+        ev = (void *) skb_put(skb, sizeof(*ev));
+        ev->status = status;
+        put_unaligned_le16(cmd, &ev->opcode);
+
+        if (sock_queue_rcv_skb(sk, skb) < 0)
+                kfree_skb(skb);
+}
+
+int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
+{
+        unsigned char *buf;
+        struct mgmt_hdr *hdr;
+        u16 opcode, len;
+        int err;
+
+        BT_DBG("got %zu bytes", msglen);
+
+        if (msglen < sizeof(*hdr))
+                return -EINVAL;
+
+        buf = kmalloc(msglen, GFP_ATOMIC);
+        if (!buf)
+                return -ENOMEM;
+
+        if (memcpy_fromiovec(buf, msg->msg_iov, msglen)) {
+                err = -EFAULT;
+                goto done;
+        }
+
+        hdr = (struct mgmt_hdr *) buf;
+        opcode = get_unaligned_le16(&hdr->opcode);
+        len = get_unaligned_le16(&hdr->len);
+
+        if (len != msglen - sizeof(*hdr)) {
+                err = -EINVAL;
+                goto done;
+        }
+
+        switch (opcode) {
+        default:
+                BT_DBG("Unknown op %u", opcode);
+                cmd_status(sk, opcode, 0x01);
+                break;
+        }
+
+        err = msglen;
+
+done:
+        kfree(buf);
+        return err;
+}