Bluetooth: Allow SCO/eSCO packet type selection for outgoing SCO connections.

__u16 sco_pkt_type is introduced to struct sockaddr_sco. It allows bitwise
selection of SCO/eSCO packet types. Currently those bits are:

0x0001 HV1 may be used.
0x0002 HV2 may be used.
0x0004 HV3 may be used.
0x0008 EV3 may be used.
0x0010 EV4 may be used.
0x0020 EV5 may be used.
0x0040 2-EV3 may be used.
0x0080 3-EV3 may be used.
0x0100 2-EV5 may be used.
0x0200 3-EV5 may be used.

This is similar to the Packet Type parameter in the HCI Setup Synchronous
Connection Command, except that we are not reversing the logic on the EDR bits.
This makes the use of sco_pkt_tpye forward portable for the use case of
white-listing packet types, which we expect will be the primary use case.

If sco_pkt_type is zero, or userspace uses the old struct sockaddr_sco,
then the default behavior is to allow all packet types.

Packet type selection is just a request made to the Bluetooth chipset, and
it is up to the link manager on the chipset to negiotiate and decide on the
actual packet types used. Furthermore, when a SCO/eSCO connection is eventually
made there is no way for the host stack to determine which packet type was used
(however it is possible to get the link type of SCO or eSCO).

sco_pkt_type is ignored for incoming SCO connections. It is possible
to add this in the future as a parameter to the Accept Synchronous Connection
Command, however its a little trickier because the kernel does not
currently preserve sockaddr_sco data between userspace calls to accept().

The most common use for sco_pkt_type will be to white-list only SCO packets,
which can be done with the hci.h constant SCO_ESCO_MASK.

This patch is motivated by broken Bluetooth carkits such as the Motorolo
HF850 (it claims to support eSCO, but will actually reject eSCO connections
after 5 seconds) and the 2007/2008 Infiniti G35/37 (fails to route audio
if a 2-EV5 packet type is negiotiated). With this patch userspace can maintain
a list of compatible packet types to workaround remote devices such as these.

Based on a patch by Marcel Holtmann.

Rebased to 2.6.39.

Change-Id: Ide1c89574fa4f6f1b9218282e1af17051eb86315
Signed-off-by: Nick Pelly <npelly@google.com>

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 498963373d60d19aeef6a660f63cee9b6cb5eddb..e35817632e4fae1c4cf68d461701d8fea8d3ac73 100644 (file)
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -157,8 +157,10 @@ enum {
 #define ESCO_2EV5      0x0100
 #define ESCO_3EV5      0x0200
 
-#define SCO_ESCO_MASK  (ESCO_HV1 | ESCO_HV2 | ESCO_HV3)
-#define EDR_ESCO_MASK  (ESCO_2EV3 | ESCO_3EV3 | ESCO_2EV5 | ESCO_3EV5)
+#define SCO_ESCO_MASK  (ESCO_HV1 | ESCO_HV2 | ESCO_HV3)
+#define EDR_ESCO_MASK  (ESCO_2EV3 | ESCO_3EV3 | ESCO_2EV5 | ESCO_3EV5)
+#define ALL_ESCO_MASK  (SCO_ESCO_MASK | ESCO_EV3 | ESCO_EV4 | ESCO_EV5 | \
+                       EDR_ESCO_MASK)
 
 /* ACL flags */
 #define ACL_START_NO_FLUSH     0x00

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 199c3474bcbf79754490e6fd80706b9082ec8271..16732f7fb724083f8386ea64b051783e84d208c0 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -415,12 +415,15 @@ void hci_add_sco(struct hci_conn *conn, __u16 handle);
 void hci_setup_sync(struct hci_conn *conn, __u16 handle);
 void hci_sco_setup(struct hci_conn *conn, __u8 status);
 
-struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst);
+struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type,
+                                       __u16 pkt_type, bdaddr_t *dst);
 int hci_conn_del(struct hci_conn *conn);
 void hci_conn_hash_flush(struct hci_dev *hdev);
 void hci_conn_check_pending(struct hci_dev *hdev);
 
-struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type);
+struct hci_conn *hci_connect(struct hci_dev *hdev, int type,
+                                       __u16 pkt_type, bdaddr_t *dst,
+                                       __u8 sec_level, __u8 auth_type);
 int hci_conn_check_link_mode(struct hci_conn *conn);
 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level);
 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type);

diff --git a/include/net/bluetooth/sco.h b/include/net/bluetooth/sco.h
index 1e35c43657c85c71560f2010242c4105701b6287..6d1857ab8e5f710926885ebf579db91584b09360 100644 (file)
--- a/include/net/bluetooth/sco.h
+++ b/include/net/bluetooth/sco.h
@@ -37,6 +37,7 @@
 struct sockaddr_sco {
        sa_family_t     sco_family;
        bdaddr_t        sco_bdaddr;
+       __u16           sco_pkt_type;
 };
 
 /* SCO socket options */
@@ -72,7 +73,8 @@ struct sco_conn {
 
 struct sco_pinfo {
        struct bt_sock  bt;
-       __u32           flags;
+       __u16           pkt_type;
+
        struct sco_conn *conn;
 };
 

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 50ced197ee04356fc6efb57a14853c826e565f31..c693889175ab9286780fa22e9428716c9a749023 100644 (file)
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -282,7 +282,8 @@ static void hci_conn_auto_accept(unsigned long arg)
        hci_dev_unlock(hdev);
 }
 
-struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
+struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type,
+                                       __u16 pkt_type, bdaddr_t *dst)
 {
        struct hci_conn *conn;
 
@@ -310,14 +311,22 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
                conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
                break;
        case SCO_LINK:
-               if (lmp_esco_capable(hdev))
-                       conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
-                                       (hdev->esco_type & EDR_ESCO_MASK);
-               else
-                       conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
-               break;
+               if (!pkt_type)
+                       pkt_type = SCO_ESCO_MASK;
        case ESCO_LINK:
-               conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
+               if (!pkt_type)
+                       pkt_type = ALL_ESCO_MASK;
+               if (lmp_esco_capable(hdev)) {
+                       /* HCI Setup Synchronous Connection Command uses
+                          reverse logic on the EDR_ESCO_MASK bits */
+                       conn->pkt_type = (pkt_type ^ EDR_ESCO_MASK) &
+                                       hdev->esco_type;
+               } else {
+                       /* Legacy HCI Add Sco Connection Command uses a
+                          shifted bitmask */
+                       conn->pkt_type = (pkt_type << 5) & hdev->pkt_type &
+                                       SCO_PTYPE_MASK;
+               }
                break;
        }
 
@@ -438,7 +447,9 @@ EXPORT_SYMBOL(hci_get_route);
 
 /* Create SCO, ACL or LE connection.
  * Device _must_ be locked */
-struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
+struct hci_conn *hci_connect(struct hci_dev *hdev, int type,
+                                       __u16 pkt_type, bdaddr_t *dst,
+                                       __u8 sec_level, __u8 auth_type)
 {
        struct hci_conn *acl;
        struct hci_conn *sco;
@@ -450,7 +461,7 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8
                le = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
                if (le)
                        return ERR_PTR(-EBUSY);
-               le = hci_conn_add(hdev, LE_LINK, dst);
+               le = hci_conn_add(hdev, LE_LINK, 0, dst);
                if (!le)
                        return ERR_PTR(-ENOMEM);
                if (le->state == BT_OPEN)
@@ -463,7 +474,7 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8
 
        acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
        if (!acl) {
-               acl = hci_conn_add(hdev, ACL_LINK, dst);
+               acl = hci_conn_add(hdev, ACL_LINK, 0, dst);
                if (!acl)
                        return NULL;
        }
@@ -482,7 +493,7 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8
 
        sco = hci_conn_hash_lookup_ba(hdev, type, dst);
        if (!sco) {
-               sco = hci_conn_add(hdev, type, dst);
+               sco = hci_conn_add(hdev, type, pkt_type, dst);
                if (!sco) {
                        hci_conn_put(acl);
                        return NULL;

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 9bf48e1ef69b4bd27a412ab09ded2cee11d76993..b46ab0c481f05432c6eb26312d63d029fb2e62e5 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -883,7 +883,7 @@ static inline void hci_cs_create_conn(struct hci_dev *hdev, __u8 status)
                }
        } else {
                if (!conn) {
-                       conn = hci_conn_add(hdev, ACL_LINK, &cp->bdaddr);
+                       conn = hci_conn_add(hdev, ACL_LINK, 0, &cp->bdaddr);
                        if (conn) {
                                conn->out = 1;
                                conn->link_mode |= HCI_LM_MASTER;
@@ -1206,7 +1206,7 @@ static void hci_cs_le_create_conn(struct hci_dev *hdev, __u8 status)
                }
        } else {
                if (!conn) {
-                       conn = hci_conn_add(hdev, LE_LINK, &cp->peer_addr);
+                       conn = hci_conn_add(hdev, LE_LINK, 0, &cp->peer_addr);
                        if (conn)
                                conn->out = 1;
                        else
@@ -1370,7 +1370,8 @@ static inline void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *sk
 
                conn = hci_conn_hash_lookup_ba(hdev, ev->link_type, &ev->bdaddr);
                if (!conn) {
-                       conn = hci_conn_add(hdev, ev->link_type, &ev->bdaddr);
+                       /* pkt_type not yet used for incoming connections */
+                       conn = hci_conn_add(hdev, ev->link_type, 0, &ev->bdaddr);
                        if (!conn) {
                                BT_ERR("No memory for new connection");
                                hci_dev_unlock(hdev);
@@ -2651,7 +2652,7 @@ static inline void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff
 
        conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, &ev->bdaddr);
        if (!conn) {
-               conn = hci_conn_add(hdev, LE_LINK, &ev->bdaddr);
+               conn = hci_conn_add(hdev, LE_LINK, 0, &ev->bdaddr);
                if (!conn) {
                        BT_ERR("No memory for new connection");
                        hci_dev_unlock(hdev);

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 32f830acee68ea3aaff5f15301e47af84d2e46b7..70e71a7a2e363cc26a7651367a94f86b7b026689 100644 (file)
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -945,10 +945,10 @@ int l2cap_chan_connect(struct l2cap_chan *chan)
        auth_type = l2cap_get_auth_type(chan);
 
        if (chan->dcid == L2CAP_CID_LE_DATA)
-               hcon = hci_connect(hdev, LE_LINK, dst,
+               hcon = hci_connect(hdev, LE_LINK, 0, dst,
                                        chan->sec_level, auth_type);
        else
-               hcon = hci_connect(hdev, ACL_LINK, dst,
+               hcon = hci_connect(hdev, ACL_LINK, 0, dst,
                                        chan->sec_level, auth_type);
 
        if (IS_ERR(hcon)) {

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index dae382ce70201d5f4adbacde509c665c467d95ac..0e272e0c3c7342b62656fe0f47d851fca63849a8 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1328,7 +1328,7 @@ static int pair_device(struct sock *sk, u16 index, unsigned char *data, u16 len)
                auth_type = HCI_AT_DEDICATED_BONDING_MITM;
        }
 
-       conn = hci_connect(hdev, ACL_LINK, &cp->bdaddr, sec_level, auth_type);
+       conn = hci_connect(hdev, ACL_LINK, 0, &cp->bdaddr, sec_level, auth_type);
        if (IS_ERR(conn)) {
                err = PTR_ERR(conn);
                goto unlock;

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 42fdffd1d76c0c17c5ab3382b94ea5bf4fcc62c9..3e1c6b1910381dea4973269bd0a9e5fcf2a453cb 100644 (file)
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -177,6 +177,7 @@ static int sco_connect(struct sock *sk)
 {
        bdaddr_t *src = &bt_sk(sk)->src;
        bdaddr_t *dst = &bt_sk(sk)->dst;
+       __u16 pkt_type = sco_pi(sk)->pkt_type;
        struct sco_conn *conn;
        struct hci_conn *hcon;
        struct hci_dev  *hdev;
@@ -192,10 +193,12 @@ static int sco_connect(struct sock *sk)
 
        if (lmp_esco_capable(hdev) && !disable_esco)
                type = ESCO_LINK;
-       else
+       else {
                type = SCO_LINK;
+               pkt_type &= SCO_ESCO_MASK;
+       }
 
-       hcon = hci_connect(hdev, type, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
+       hcon = hci_connect(hdev, type, pkt_type, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
        if (IS_ERR(hcon)) {
                err = PTR_ERR(hcon);
                goto done;
@@ -451,18 +454,22 @@ static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
        return 0;
 }
 
-static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
+static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 {
-       struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
+       struct sockaddr_sco sa;
        struct sock *sk = sock->sk;
-       bdaddr_t *src = &sa->sco_bdaddr;
-       int err = 0;
+       bdaddr_t *src = &sa.sco_bdaddr;
+       int len, err = 0;
 
-       BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
+       BT_DBG("sk %p %s", sk, batostr(&sa.sco_bdaddr));
 
        if (!addr || addr->sa_family != AF_BLUETOOTH)
                return -EINVAL;
 
+       memset(&sa, 0, sizeof(sa));
+       len = min_t(unsigned int, sizeof(sa), alen);
+       memcpy(&sa, addr, len);
+
        lock_sock(sk);
 
        if (sk->sk_state != BT_OPEN) {
@@ -476,7 +483,8 @@ static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_le
                err = -EADDRINUSE;
        } else {
                /* Save source address */
-               bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
+               bacpy(&bt_sk(sk)->src, &sa.sco_bdaddr);
+               sco_pi(sk)->pkt_type = sa.sco_pkt_type;
                sk->sk_state = BT_BOUND;
        }
 
@@ -489,27 +497,34 @@ done:
 
 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 {
-       struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
        struct sock *sk = sock->sk;
-       int err = 0;
-
+       struct sockaddr_sco sa;
+       int len, err = 0;
 
        BT_DBG("sk %p", sk);
 
-       if (alen < sizeof(struct sockaddr_sco) ||
-           addr->sa_family != AF_BLUETOOTH)
+       if (!addr || addr->sa_family != AF_BLUETOOTH)
                return -EINVAL;
 
-       if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
-               return -EBADFD;
-
-       if (sk->sk_type != SOCK_SEQPACKET)
-               return -EINVAL;
+       memset(&sa, 0, sizeof(sa));
+       len = min_t(unsigned int, sizeof(sa), alen);
+       memcpy(&sa, addr, len);
 
        lock_sock(sk);
 
+       if (sk->sk_type != SOCK_SEQPACKET) {
+               err = -EINVAL;
+               goto done;
+       }
+
+       if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
+               err = -EBADFD;
+               goto done;
+       }
+
        /* Set destination address and psm */
-       bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
+       bacpy(&bt_sk(sk)->dst, &sa.sco_bdaddr);
+       sco_pi(sk)->pkt_type = sa.sco_pkt_type;
 
        err = sco_connect(sk);
        if (err)
@@ -616,6 +631,7 @@ static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len
                bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
        else
                bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
+       sa->sco_pkt_type = sco_pi(sk)->pkt_type;
 
        return 0;
 }