Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 51363b87 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

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: default avatarUrsula Braun <ursula.braun@de.ibm.com>
Signed-off-by: default avatarFrank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 800c5eb7

include/net/iucv/af_iucv.h

+1 −0
Original line number Diff line number Diff line
@@ -132,6 +132,7 @@ struct iucv_sock { 
/* 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

+9 −1
Original line number Diff line number Diff line
@@ -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;

	}