This change adds support for reporting the BT_PKT_STATUS to the socket
CMSG data to allow the implementation of a packet loss correction on
erronous data received on the SCO socket.
The patch was partially developed by Marcel Holtmann and validated by
Hsin-yu Chao.
Signed-off-by: Alain Michaud <alainm@xxxxxxxxxxxx>
---
Changes in v6:
- Fixing sparse errors.
Changes in v5:
- reducing cmsg_mask to 8 bit
- clarifying the public symbol usage versus internal CMSG flags.
Changes in v4:
- Addressing feedback from Marcel
include/net/bluetooth/bluetooth.h | 10 ++++++++++
include/net/bluetooth/sco.h | 2 ++
net/bluetooth/af_bluetooth.c | 3 +++
net/bluetooth/hci_core.c | 1 +
net/bluetooth/sco.c | 32 +++++++++++++++++++++++++++++++
5 files changed, 48 insertions(+)
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 3fa7b1e3c5d9..4044c6a1ffd0 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -147,6 +147,10 @@ struct bt_voice {
#define BT_MODE_LE_FLOWCTL 0x03
#define BT_MODE_EXT_FLOWCTL 0x04
+#define BT_PKT_STATUS 16
+
+#define BT_SCM_PKT_STATUS 0x03
+
__printf(1, 2)
void bt_info(const char *fmt, ...);
__printf(1, 2)
@@ -275,6 +279,7 @@ struct bt_sock {
struct sock *parent;
unsigned long flags;
void (*skb_msg_name)(struct sk_buff *, void *, int *);
+ void (*skb_put_cmsg)(struct sk_buff *, struct msghdr *, struct sock *);
};
enum {
@@ -324,6 +329,10 @@ struct l2cap_ctrl {
struct l2cap_chan *chan;
};
+struct sco_ctrl {
+ u8 pkt_status;
+};
+
struct hci_dev;
typedef void (*hci_req_complete_t)(struct hci_dev *hdev, u8 status, u16 opcode);
@@ -350,6 +359,7 @@ struct bt_skb_cb {
u8 incoming:1;
union {
struct l2cap_ctrl l2cap;
+ struct sco_ctrl sco;
struct hci_ctrl hci;
};
};
diff --git a/include/net/bluetooth/sco.h b/include/net/bluetooth/sco.h
index f40ddb4264fc..1aa2e14b6c94 100644
--- a/include/net/bluetooth/sco.h
+++ b/include/net/bluetooth/sco.h
@@ -46,4 +46,6 @@ struct sco_conninfo {
__u8 dev_class[3];
};
+#define SCO_CMSG_PKT_STATUS 0x01
+
#endif /* __SCO_H */
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 3fd124927d4d..d0abea8d08cc 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -286,6 +286,9 @@ int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (msg->msg_name && bt_sk(sk)->skb_msg_name)
bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
&msg->msg_namelen);
+
+ if (bt_sk(sk)->skb_put_cmsg)
+ bt_sk(sk)->skb_put_cmsg(skb, msg, sk);
}
skb_free_datagram(sk, skb);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 51d399273276..7b5e46198d99 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -4549,6 +4549,7 @@ static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
if (conn) {
/* Send to upper protocol */
+ bt_cb(skb)->sco.pkt_status = flags & 0x03;
sco_recv_scodata(conn, skb);
return;
} else {
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index c8c3d38cdc7b..83a48860bb5d 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -66,6 +66,7 @@ struct sco_pinfo {
bdaddr_t dst;
__u32 flags;
__u16 setting;
+ __u8 cmsg_mask;
struct sco_conn *conn;
};
@@ -449,6 +450,15 @@ static void sco_sock_close(struct sock *sk)
sco_sock_kill(sk);
}
+static void sco_skb_put_cmsg(struct sk_buff *skb, struct msghdr *msg,
+ struct sock *sk)
+{
+ if (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS)
+ put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
+ sizeof(bt_cb(skb)->sco.pkt_status),
+ &bt_cb(skb)->sco.pkt_status);
+}
+
static void sco_sock_init(struct sock *sk, struct sock *parent)
{
BT_DBG("sk %p", sk);
@@ -457,6 +467,8 @@ static void sco_sock_init(struct sock *sk, struct sock *parent)
sk->sk_type = parent->sk_type;
bt_sk(sk)->flags = bt_sk(parent)->flags;
security_sk_clone(parent, sk);
+ } else {
+ bt_sk(sk)->skb_put_cmsg = sco_skb_put_cmsg;
}
}
@@ -846,6 +858,18 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
sco_pi(sk)->setting = voice.setting;
break;
+ case BT_PKT_STATUS:
+ if (get_user(opt, (u32 __user *)optval)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (opt)
+ sco_pi(sk)->cmsg_mask |= SCO_CMSG_PKT_STATUS;
+ else
+ sco_pi(sk)->cmsg_mask &= SCO_CMSG_PKT_STATUS;
+ break;
+
default:
err = -ENOPROTOOPT;
break;
@@ -923,6 +947,7 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
int len, err = 0;
struct bt_voice voice;
u32 phys;
+ int pkt_status;
BT_DBG("sk %p", sk);
@@ -969,6 +994,13 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
err = -EFAULT;
break;
+ case BT_PKT_STATUS:
+ pkt_status = (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS);
+
+ if (put_user(pkt_status, (int __user *)optval))
+ err = -EFAULT;
+ break;
+
default:
err = -ENOPROTOOPT;
break;
--
2.27.0.290.gba653c62da-goog
