net/tcp: switch ->md5_parse 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/tcp.h

@@ -2002,7 +2002,7 @@ struct tcp_sock_af_ops {
 					 const struct sk_buff *skb);
 	int		(*md5_parse)(struct sock *sk,
 				     int optname,
-				     char __user *optval,
+				     sockptr_t optval,
 				     int optlen);
 #endif
 };

net/ipv4/tcp.c

@@ -3249,7 +3249,8 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 #ifdef CONFIG_TCP_MD5SIG
 	case TCP_MD5SIG:
 	case TCP_MD5SIG_EXT:
-		err = tp->af_specific->md5_parse(sk, optname, optval, optlen);
+		err = tp->af_specific->md5_parse(sk, optname,
+						 USER_SOCKPTR(optval), optlen);
 		break;
 #endif
 	case TCP_USER_TIMEOUT:

net/ipv4/tcp_ipv4.c

@@ -1195,7 +1195,7 @@ static void tcp_clear_md5_list(struct sock *sk)
 }
 
 static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
-				 char __user *optval, int optlen)
+				 sockptr_t optval, int optlen)
 {
 	struct tcp_md5sig cmd;
 	struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
@@ -1206,7 +1206,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
 	if (optlen < sizeof(cmd))
 		return -EINVAL;
 
-	if (copy_from_user(&cmd, optval, sizeof(cmd)))
+	if (copy_from_sockptr(&cmd, optval, sizeof(cmd)))
 		return -EFAULT;
 
 	if (sin->sin_family != AF_INET)

net/ipv6/tcp_ipv6.c

@@ -567,7 +567,7 @@ static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
 }
 
 static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
-				 char __user *optval, int optlen)
+				 sockptr_t optval, int optlen)
 {
 	struct tcp_md5sig cmd;
 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
@@ -577,7 +577,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 	if (optlen < sizeof(cmd))
 		return -EINVAL;
 
-	if (copy_from_user(&cmd, optval, sizeof(cmd)))
+	if (copy_from_sockptr(&cmd, optval, sizeof(cmd)))
 		return -EFAULT;
 
 	if (sin6->sin6_family != AF_INET6)