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Bluetooth: Add support for BT_PKT_STATUS CMSG data for SCO connections

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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
erroneous 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@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alain Michaud 2020-06-11 19:50:41 +00:00 committed by Marcel Holtmann
parent e660b3510e
commit 00398e1d51
5 changed files with 48 additions and 0 deletions
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10
include/net/bluetooth/bluetooth.h
View file

@ -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)
@ -286,6 +290,7 @@ 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 {
@ -335,6 +340,10 @@ 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);
@ -361,6 +370,7 @@ struct bt_skb_cb {
u8 incoming:1;
union {
struct l2cap_ctrl l2cap;
struct sco_ctrl sco;
struct hci_ctrl hci;
};
};

2
include/net/bluetooth/sco.h
View file

@ -46,4 +46,6 @@ struct sco_conninfo {
__u8 dev_class[3];
};
#define SCO_CMSG_PKT_STATUS 0x01
#endif /* __SCO_H */

3
net/bluetooth/af_bluetooth.c
View file

@ -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);

1
net/bluetooth/hci_core.c
View file

@ -4554,6 +4554,7 @@ 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 {

32
net/bluetooth/sco.c
View file

@ -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;