af_iucv: add sockopt() to enable/disable use of IPRM_DATA msgs

Provide the socket operations getsocktopt() and setsockopt() to enable/disable
sending of data in the parameter list of IUCV messages.
The patch sets respective flag only.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 81 insertions, 3 deletions

diff --git a/include/linux/socket.h b/include/linux/socket.h
index 42a0396f2c59..d2310cb45d2f 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -303,6 +303,7 @@ struct ucred {
 #define SOL_BLUETOOTH   274
 #define SOL_PNPIPE      275
 #define SOL_RDS         276
+#define SOL_IUCV        277
 
 /* IPX options */
 #define IPX_TYPE        1
diff --git a/include/net/iucv/af_iucv.h b/include/net/iucv/af_iucv.h
index 85f80eadfa35..78a72764aeff 100644
--- a/include/net/iucv/af_iucv.h
+++ b/include/net/iucv/af_iucv.h
@@ -73,8 +73,12 @@ struct iucv_sock {
         struct sk_buff_head     backlog_skb_q;
         struct sock_msg_q       message_q;
         unsigned int            send_tag;
+        u8                      flags;
 };
 
+/* iucv socket options (SOL_IUCV) */
+#define SO_IPRMDATA_MSG 0x0080          /* send/recv IPRM_DATA msgs */
+
 struct iucv_sock_list {
         struct hlist_head head;
         rwlock_t          lock;
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 6cf02b41ef95..b7c40c979921 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -32,7 +32,7 @@
 #define CONFIG_IUCV_SOCK_DEBUG 1
 
 #define IPRMDATA 0x80
-#define VERSION "1.0"
+#define VERSION "1.1"
 
 static char iucv_userid[80];
 
@@ -226,6 +226,7 @@ static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
         spin_lock_init(&iucv_sk(sk)->message_q.lock);
         skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
         iucv_sk(sk)->send_tag = 0;
+        iucv_sk(sk)->flags = 0;
 
         sk->sk_destruct = iucv_sock_destruct;
         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
@@ -1003,6 +1004,78 @@ static int iucv_sock_release(struct socket *sock)
         return err;
 }
 
+/* getsockopt and setsockopt */
+static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
+                                char __user *optval, int optlen)
+{
+        struct sock *sk = sock->sk;
+        struct iucv_sock *iucv = iucv_sk(sk);
+        int val;
+        int rc;
+
+        if (level != SOL_IUCV)
+                return -ENOPROTOOPT;
+
+        if (optlen < sizeof(int))
+                return -EINVAL;
+
+        if (get_user(val, (int __user *) optval))
+                return -EFAULT;
+
+        rc = 0;
+
+        lock_sock(sk);
+        switch (optname) {
+        case SO_IPRMDATA_MSG:
+                if (val)
+                        iucv->flags |= IUCV_IPRMDATA;
+                else
+                        iucv->flags &= ~IUCV_IPRMDATA;
+                break;
+        default:
+                rc = -ENOPROTOOPT;
+                break;
+        }
+        release_sock(sk);
+
+        return rc;
+}
+
+static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
+                                char __user *optval, int __user *optlen)
+{
+        struct sock *sk = sock->sk;
+        struct iucv_sock *iucv = iucv_sk(sk);
+        int val, len;
+
+        if (level != SOL_IUCV)
+                return -ENOPROTOOPT;
+
+        if (get_user(len, optlen))
+                return -EFAULT;
+
+        if (len < 0)
+                return -EINVAL;
+
+        len = min_t(unsigned int, len, sizeof(int));
+
+        switch (optname) {
+        case SO_IPRMDATA_MSG:
+                val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
+                break;
+        default:
+                return -ENOPROTOOPT;
+        }
+
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &val, len))
+                return -EFAULT;
+
+        return 0;
+}
+
+
 /* Callback wrappers - called from iucv base support */
 static int iucv_callback_connreq(struct iucv_path *path,
                                  u8 ipvmid[8], u8 ipuser[16])
@@ -1229,8 +1302,8 @@ static struct proto_ops iucv_sock_ops = {
         .mmap           = sock_no_mmap,
         .socketpair     = sock_no_socketpair,
         .shutdown       = iucv_sock_shutdown,
-        .setsockopt     = sock_no_setsockopt,
-        .getsockopt     = sock_no_getsockopt
+        .setsockopt     = iucv_sock_setsockopt,
+        .getsockopt     = iucv_sock_getsockopt,
 };
 
 static struct net_proto_family iucv_sock_family_ops = {