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Bluetooth: Provide msg_name callback for L2CAP connectionless channels 

The L2CAP connectionless channels use SOCK_DGRAM and recvmsg() and need
to receive the remote BD_ADDR and PSM information via msg_name from
the recvmsg() system call.

So in case the L2CAP socket is for connectionless channels, provide
a msg_name callback that can update the data. Also store the remote
BD_ADDR and PSM in the skb so it can be extracted later on.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2013-10-13 12:55:29 -07:00 committed by Johan Hedberg
parent d97636980f
commit 2edf870d19
3 changed files with 20 additions and 1 deletions
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2
include/net/bluetooth/bluetooth.h
View File

@ -284,6 +284,8 @@ struct bt_skb_cb {
__u8 force_active;
struct l2cap_ctrl control;
struct hci_req_ctrl req;
bdaddr_t bdaddr;
__le16 psm;
};
#define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))

4
net/bluetooth/l2cap_core.c
View File

@ -6459,6 +6459,10 @@ static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
if (chan->imtu < skb->len)
goto drop;
/* Store remote BD_ADDR and PSM for msg_name */
bacpy(&bt_cb(skb)->bdaddr, &conn->hcon->dst);
bt_cb(skb)->psm = psm;
if (!chan->ops->recv(chan, skb))
return;

15
net/bluetooth/l2cap_sock.c
View File

@ -1137,6 +1137,19 @@ static void l2cap_sock_destruct(struct sock *sk)
skb_queue_purge(&sk->sk_write_queue);
}
static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
int *msg_namelen)
{
struct sockaddr_l2 *la = (struct sockaddr_l2 *) msg_name;
memset(la, 0, sizeof(struct sockaddr_l2));
la->l2_family = AF_BLUETOOTH;
la->l2_psm = bt_cb(skb)->psm;
bacpy(&la->l2_bdaddr, &bt_cb(skb)->bdaddr);
*msg_namelen = sizeof(struct sockaddr_l2);
}
static void l2cap_sock_init(struct sock *sk, struct sock *parent)
{
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
@ -1163,13 +1176,13 @@ static void l2cap_sock_init(struct sock *sk, struct sock *parent)
security_sk_clone(parent, sk);
} else {
switch (sk->sk_type) {
case SOCK_RAW:
chan->chan_type = L2CAP_CHAN_RAW;
break;
case SOCK_DGRAM:
chan->chan_type = L2CAP_CHAN_CONN_LESS;
bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
break;
case SOCK_SEQPACKET:
case SOCK_STREAM: