[patch 3/3] af_iucv: exploit target message class support of IUCV

[Ursula Braun <braunu@de.ibm.com>]

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From: Ursula Braun <braunu@de.ibm.com>

The first 4 bytes of data to be sent are stored additionally into
the message class field of the send request. A receiving target
program (not an af_iucv socket program) can make use of this
information to pre-screen incoming messages.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
---

 net/iucv/af_iucv.c |    1 +
 1 file changed, 1 insertion(+)

Index: net-2.6-uschi/net/iucv/af_iucv.c
===================================================================
--- net-2.6-uschi.orig/net/iucv/af_iucv.c
+++ net-2.6-uschi/net/iucv/af_iucv.c
@@ -644,6 +644,7 @@ static int iucv_sock_sendmsg(struct kioc
 		}
 
 		txmsg.class = 0;
+		memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
 		txmsg.tag = iucv->send_tag++;
 		memcpy(skb->cb, &txmsg.tag, 4);
 		skb_queue_tail(&iucv->send_skb_q, skb);

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