NFC: Implement LLCP connection less Tx path

It simply involves getting the client dsap and ssap and calling the UI
frame building and sending routine.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

net/nfc/llcp/sock.c

@@ -608,6 +608,25 @@ static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 
  lock_sock(sk);
 
+ if (sk->sk_type == SOCK_DGRAM) {
+ struct sockaddr_nfc_llcp *addr =
+ (struct sockaddr_nfc_llcp *)msg->msg_name;
+
+ if (msg->msg_namelen < sizeof(*addr)) {
+ release_sock(sk);
+
+ pr_err("Invalid socket address length %d\n",
+ msg->msg_namelen);
+
+ return -EINVAL;
+ }
+
+ release_sock(sk);
+
+ return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
+ msg, len);
+ }
+
  if (sk->sk_state != LLCP_CONNECTED) {
  release_sock(sk);
  return -ENOTCONN;