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af_iucv: allow retrieval of maximum message size

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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 <[email protected]>
Signed-off-by: Frank Blaschka <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Ursula Braun 2012-02-08 00:19:48 +00:00 • committed by David S. Miller
commit 51363b8751
2 changed files with 10 additions and 1 deletions
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10
net/iucv/af_iucv.c
View file

@ -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;
}