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>

include/net/iucv/af_iucv.h

diff --git a/include/net/iucv/af_iucv.h b/include/net/iucv/af_iucv.h
index a151788..2e1d5ec 100644
--- a/include/net/iucv/af_iucv.h
+++ b/include/net/iucv/af_iucv.h
@@ -132,6 +132,7 @@
 /* iucv socket options (SOL_IUCV) */
 #define SO_IPRMDATA_MSG	0x0080		/* send/recv IPRM_DATA msgs */
 #define SO_MSGLIMIT	0x1000		/* get/set IUCV MSGLIMIT */
+#define SO_MSGSIZE	0x0800		/* get maximum msgsize */
 
 /* iucv related control messages (scm) */
 #define SCM_IUCV_TRGCLS	0x0001		/* target class control message */

net/iucv/af_iucv.c

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index fbce4a3..98d1f0b 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1633,7 +1633,8 @@
 {
 	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 @@
 					   : 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;
 	}