net/udp: switch udp_lib_setsockopt to sockptr_t

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/udp.h

@@ -306,7 +306,7 @@ struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
 int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 		       char __user *optval, int __user *optlen);
 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
-		       char __user *optval, unsigned int optlen,
+		       sockptr_t optval, unsigned int optlen,
 		       int (*push_pending_frames)(struct sock *));
 struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
 			     __be32 daddr, __be16 dport, int dif);

net/ipv4/udp.c

@@ -2588,7 +2588,7 @@ void udp_destroy_sock(struct sock *sk)
  *	Socket option code for UDP
  */
 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
-		       char __user *optval, unsigned int optlen,
+		       sockptr_t optval, unsigned int optlen,
 		       int (*push_pending_frames)(struct sock *))
 {
 	struct udp_sock *up = udp_sk(sk);
@@ -2599,7 +2599,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	valbool = val ? 1 : 0;
@@ -2707,7 +2707,8 @@ int udp_setsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+		return udp_lib_setsockopt(sk, level, optname,
+					  USER_SOCKPTR(optval), optlen,
 					  udp_push_pending_frames);
 	return ip_setsockopt(sk, level, optname, optval, optlen);
 }

net/ipv6/udp.c

@@ -1622,7 +1622,8 @@ int udpv6_setsockopt(struct sock *sk, int level, int optname,
 		     char __user *optval, unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+		return udp_lib_setsockopt(sk, level, optname,
+					  USER_SOCKPTR(optval), optlen,
 					  udp_v6_push_pending_frames);
 	return ipv6_setsockopt(sk, level, optname, optval, optlen);
 }