Bluetooth: Add blacklist support for incoming connections

In some circumstances it could be desirable to reject incoming
connections on the baseband level. This patch adds this feature through
two new ioctl's: HCIBLOCKADDR and HCIUNBLOCKADDR. Both take a simple
Bluetooth address as a parameter. BDADDR_ANY can be used with
HCIUNBLOCKADDR to remove all devices from the blacklist.

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

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 641640d..1863896 100644 (file)
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1328,6 +1328,8 @@ COMPATIBLE_IOCTL(HCISETLINKPOL)
 COMPATIBLE_IOCTL(HCISETLINKMODE)
 COMPATIBLE_IOCTL(HCISETACLMTU)
 COMPATIBLE_IOCTL(HCISETSCOMTU)
+COMPATIBLE_IOCTL(HCIBLOCKADDR)
+COMPATIBLE_IOCTL(HCIUNBLOCKADDR)
 COMPATIBLE_IOCTL(HCIINQUIRY)
 COMPATIBLE_IOCTL(HCIUARTSETPROTO)
 COMPATIBLE_IOCTL(HCIUARTGETPROTO)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index fc0c502..ca2518e 100644 (file)
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -100,6 +100,9 @@ enum {
 #define HCISETACLMTU   _IOW('H', 227, int)
 #define HCISETSCOMTU   _IOW('H', 228, int)
 
+#define HCIBLOCKADDR   _IOW('H', 230, int)
+#define HCIUNBLOCKADDR _IOW('H', 231, int)
+
 #define HCIINQUIRY     _IOR('H', 240, int)
 
 /* HCI timeouts */

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index e42f6ed..ffc6377 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -62,6 +62,11 @@ struct hci_conn_hash {
        unsigned int     sco_num;
 };
 
+struct bdaddr_list {
+       struct list_head list;
+       bdaddr_t bdaddr;
+};
+
 struct hci_dev {
        struct list_head list;
        spinlock_t      lock;
@@ -127,6 +132,7 @@ struct hci_dev {
 
        struct inquiry_cache    inq_cache;
        struct hci_conn_hash    conn_hash;
+       struct bdaddr_list      blacklist;
 
        struct hci_dev_stats    stat;
 
@@ -424,6 +430,9 @@ int hci_get_conn_info(struct hci_dev *hdev, void __user *arg);
 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg);
 int hci_inquiry(void __user *arg);
 
+struct bdaddr_list *hci_blacklist_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr);
+int hci_blacklist_clear(struct hci_dev *hdev);
+
 void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);
 
 int hci_recv_frame(struct sk_buff *skb);

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2f768de..aeb2982 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -562,6 +562,7 @@ static int hci_dev_do_close(struct hci_dev *hdev)
        hci_dev_lock_bh(hdev);
        inquiry_cache_flush(hdev);
        hci_conn_hash_flush(hdev);
+       hci_blacklist_clear(hdev);
        hci_dev_unlock_bh(hdev);
 
        hci_notify(hdev, HCI_DEV_DOWN);
@@ -923,6 +924,8 @@ int hci_register_dev(struct hci_dev *hdev)
 
        hci_conn_hash_init(hdev);
 
+       INIT_LIST_HEAD(&hdev->blacklist.list);
+
        memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
 
        atomic_set(&hdev->promisc, 0);

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 786b5de..43feeef 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -952,7 +952,7 @@ static inline void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *sk
 
        mask |= hci_proto_connect_ind(hdev, &ev->bdaddr, ev->link_type);
 
-       if (mask & HCI_LM_ACCEPT) {
+       if ((mask & HCI_LM_ACCEPT) && !hci_blacklist_lookup(hdev, &ev->bdaddr)) {
                /* Connection accepted */
                struct inquiry_entry *ie;
                struct hci_conn *conn;

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 38f08f6..4f170a5 100644 (file)
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -165,6 +165,86 @@ static int hci_sock_release(struct socket *sock)
        return 0;
 }
 
+struct bdaddr_list *hci_blacklist_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
+{
+       struct list_head *p;
+       struct bdaddr_list *blacklist = &hdev->blacklist;
+
+       list_for_each(p, &blacklist->list) {
+               struct bdaddr_list *b;
+
+               b = list_entry(p, struct bdaddr_list, list);
+
+               if (bacmp(bdaddr, &b->bdaddr) == 0)
+                       return b;
+       }
+
+       return NULL;
+}
+
+static int hci_blacklist_add(struct hci_dev *hdev, void __user *arg)
+{
+       bdaddr_t bdaddr;
+       struct bdaddr_list *entry;
+
+       if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
+               return -EFAULT;
+
+       if (bacmp(&bdaddr, BDADDR_ANY) == 0)
+               return -EBADF;
+
+       if (hci_blacklist_lookup(hdev, &bdaddr))
+               return -EEXIST;
+
+       entry = kzalloc(sizeof(struct bdaddr_list), GFP_KERNEL);
+       if (!entry)
+               return -ENOMEM;
+
+       bacpy(&entry->bdaddr, &bdaddr);
+
+       list_add(&entry->list, &hdev->blacklist.list);
+
+       return 0;
+}
+
+int hci_blacklist_clear(struct hci_dev *hdev)
+{
+       struct list_head *p, *n;
+       struct bdaddr_list *blacklist = &hdev->blacklist;
+
+       list_for_each_safe(p, n, &blacklist->list) {
+               struct bdaddr_list *b;
+
+               b = list_entry(p, struct bdaddr_list, list);
+
+               list_del(p);
+               kfree(b);
+       }
+
+       return 0;
+}
+
+static int hci_blacklist_del(struct hci_dev *hdev, void __user *arg)
+{
+       bdaddr_t bdaddr;
+       struct bdaddr_list *entry;
+
+       if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
+               return -EFAULT;
+
+       if (bacmp(&bdaddr, BDADDR_ANY) == 0)
+               return hci_blacklist_clear(hdev);
+
+       entry = hci_blacklist_lookup(hdev, &bdaddr);
+       if (!entry)
+               return -ENOENT;
+
+       list_del(&entry->list);
+       kfree(entry);
+
+       return 0;
+}
+
 /* Ioctls that require bound socket */
 static inline int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 {
@@ -194,6 +274,16 @@ static inline int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, unsign
        case HCIGETAUTHINFO:
                return hci_get_auth_info(hdev, (void __user *) arg);
 
+       case HCIBLOCKADDR:
+               if (!capable(CAP_NET_ADMIN))
+                       return -EACCES;
+               return hci_blacklist_add(hdev, (void __user *) arg);
+
+       case HCIUNBLOCKADDR:
+               if (!capable(CAP_NET_ADMIN))
+                       return -EACCES;
+               return hci_blacklist_del(hdev, (void __user *) arg);
+
        default:
                if (hdev->ioctl)
                        return hdev->ioctl(hdev, cmd, arg);