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Bluetooth: Add support for BT_PKT_STATUS CMSG data for SCO connections
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>
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@ -147,6 +147,10 @@ struct bt_voice {
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#define BT_MODE_LE_FLOWCTL 0x03
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#define BT_MODE_EXT_FLOWCTL 0x04
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#define BT_PKT_STATUS 16
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#define BT_SCM_PKT_STATUS 0x03
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__printf(1, 2)
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void bt_info(const char *fmt, ...);
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__printf(1, 2)
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@ -286,6 +290,7 @@ struct bt_sock {
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struct sock *parent;
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unsigned long flags;
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void (*skb_msg_name)(struct sk_buff *, void *, int *);
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void (*skb_put_cmsg)(struct sk_buff *, struct msghdr *, struct sock *);
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};
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enum {
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@ -335,6 +340,10 @@ struct l2cap_ctrl {
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struct l2cap_chan *chan;
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};
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struct sco_ctrl {
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u8 pkt_status;
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};
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struct hci_dev;
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typedef void (*hci_req_complete_t)(struct hci_dev *hdev, u8 status, u16 opcode);
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@ -361,6 +370,7 @@ struct bt_skb_cb {
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u8 incoming:1;
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union {
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struct l2cap_ctrl l2cap;
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struct sco_ctrl sco;
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struct hci_ctrl hci;
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};
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};
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@ -46,4 +46,6 @@ struct sco_conninfo {
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__u8 dev_class[3];
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};
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#define SCO_CMSG_PKT_STATUS 0x01
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#endif /* __SCO_H */
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@ -286,6 +286,9 @@ int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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if (msg->msg_name && bt_sk(sk)->skb_msg_name)
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bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
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&msg->msg_namelen);
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if (bt_sk(sk)->skb_put_cmsg)
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bt_sk(sk)->skb_put_cmsg(skb, msg, sk);
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}
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skb_free_datagram(sk, skb);
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@ -4554,6 +4554,7 @@ static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
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if (conn) {
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/* Send to upper protocol */
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bt_cb(skb)->sco.pkt_status = flags & 0x03;
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sco_recv_scodata(conn, skb);
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return;
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} else {
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@ -66,6 +66,7 @@ struct sco_pinfo {
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bdaddr_t dst;
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__u32 flags;
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__u16 setting;
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__u8 cmsg_mask;
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struct sco_conn *conn;
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};
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@ -449,6 +450,15 @@ static void sco_sock_close(struct sock *sk)
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sco_sock_kill(sk);
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}
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static void sco_skb_put_cmsg(struct sk_buff *skb, struct msghdr *msg,
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struct sock *sk)
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{
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if (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS)
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put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
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sizeof(bt_cb(skb)->sco.pkt_status),
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&bt_cb(skb)->sco.pkt_status);
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}
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static void sco_sock_init(struct sock *sk, struct sock *parent)
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{
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BT_DBG("sk %p", sk);
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@ -457,6 +467,8 @@ static void sco_sock_init(struct sock *sk, struct sock *parent)
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sk->sk_type = parent->sk_type;
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bt_sk(sk)->flags = bt_sk(parent)->flags;
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security_sk_clone(parent, sk);
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} else {
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bt_sk(sk)->skb_put_cmsg = sco_skb_put_cmsg;
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}
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}
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@ -846,6 +858,18 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
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sco_pi(sk)->setting = voice.setting;
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break;
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case BT_PKT_STATUS:
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if (get_user(opt, (u32 __user *)optval)) {
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err = -EFAULT;
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break;
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}
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if (opt)
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sco_pi(sk)->cmsg_mask |= SCO_CMSG_PKT_STATUS;
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else
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sco_pi(sk)->cmsg_mask &= SCO_CMSG_PKT_STATUS;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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@ -923,6 +947,7 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
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int len, err = 0;
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struct bt_voice voice;
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u32 phys;
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int pkt_status;
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BT_DBG("sk %p", sk);
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@ -969,6 +994,13 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
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err = -EFAULT;
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break;
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case BT_PKT_STATUS:
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pkt_status = (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS);
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if (put_user(pkt_status, (int __user *)optval))
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err = -EFAULT;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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