af_iucv: allow retrieval of maximum message size

For HS transport the maximum message size depends on the MTU-size
of the HS-device bound to the AF_IUCV socket. This patch adds a
getsockopt option MSGSIZE returning the maximum message size that
can be handled for this AF_IUCV socket.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/iucv/af_iucv.c

@@ -1633,7 +1633,8 @@ static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
 {
 	struct sock *sk = sock->sk;
 	struct iucv_sock *iucv = iucv_sk(sk);
-	int val, len;
+	unsigned int val;
+	int len;
 
 	if (level != SOL_IUCV)
 		return -ENOPROTOOPT;
@@ -1656,6 +1657,13 @@ static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
 					   : iucv->msglimit;	/* default */
 		release_sock(sk);
 		break;
+	case SO_MSGSIZE:
+		if (sk->sk_state == IUCV_OPEN)
+			return -EBADFD;
+		val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
+				sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
+				0x7fffffff;
+		break;
 	default:
 		return -ENOPROTOOPT;
 	}