diff options
| author | Ursula Braun <ursula.braun@de.ibm.com> | 2012-02-08 00:19:48 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-08 18:50:19 -0500 |
| commit | 51363b8751a673a00ad48eea895266396d53fa52 (patch) | |
| tree | ea8b4278a7a5115ee848bac4b33e5f0f44369488 | |
| parent | 800c5eb7b5eba6cb2a32738d763fd59f0fbcdde4 (diff) | |
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>
| -rw-r--r-- | include/net/iucv/af_iucv.h | 1 | ||||
| -rw-r--r-- | net/iucv/af_iucv.c | 10 |
2 files changed, 10 insertions, 1 deletions
diff --git a/include/net/iucv/af_iucv.h b/include/net/iucv/af_iucv.h index a1517887aea..2e1d5ecc2d1 100644 --- a/include/net/iucv/af_iucv.h +++ b/include/net/iucv/af_iucv.h @@ -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 */ diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index fbce4a3126d..98d1f0ba7fe 100644 --- a/net/iucv/af_iucv.c +++ b/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; } |