[PATCH net-next v4 3/7] ieee802154: convert dgram getsockopt to sockopt_t

Continue converting the proto-layer getsockopt callbacks to the sockopt_t
interface, splitting dgram_getsockopt() into a do_dgram_getsockopt() helper
that takes a sockopt_t.

No functional change.

Reviewed-by: Joe Damato <[email protected]>
Acked-by: Stanislav Fomichev <[email protected]>
Signed-off-by: Breno Leitao <[email protected]>
---
 net/ieee802154/socket.c | 38 ++++++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 85dce296d7513..5a36e87893f64 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -831,20 +831,12 @@ static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
 	return ret;
 }
 
-static int dgram_getsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, int __user *optlen)
+static int do_dgram_getsockopt(struct sock *sk, int optname, sockopt_t *opt)
 {
 	struct dgram_sock *ro = dgram_sk(sk);
-
 	int val, len;
 
-	if (level != SOL_IEEE802154)
-		return -EOPNOTSUPP;
-
-	if (get_user(len, optlen))
-		return -EFAULT;
-
-	len = min_t(unsigned int, len, sizeof(int));
+	len = umin(sizeof(int), opt->optlen);
 
 	switch (optname) {
 	case WPAN_WANTACK:
@@ -871,10 +863,32 @@ static int dgram_getsockopt(struct sock *sk, int level, int optname,
 		return -ENOPROTOOPT;
 	}
 
-	if (put_user(len, optlen))
+	opt->optlen = len;
+	if (copy_to_iter(&val, len, &opt->iter_out) != len)
 		return -EFAULT;
-	if (copy_to_user(optval, &val, len))
+	return 0;
+}
+
+static int dgram_getsockopt(struct sock *sk, int level, int optname,
+			    char __user *optval, int __user *optlen)
+{
+	sockopt_t opt;
+	int err;
+
+	if (level != SOL_IEEE802154)
+		return -EOPNOTSUPP;
+
+	err = sockopt_init_user(&opt, optval, optlen);
+	if (err)
+		return err;
+
+	err = do_dgram_getsockopt(sk, optname, &opt);
+	if (err)
+		return err;
+
+	if (put_user(opt.optlen, optlen))
 		return -EFAULT;
+
 	return 0;
 }
 

-- 
2.53.0-Meta