net: get rid of some pointless casts to sockaddr

The following 4 functions:
  move_addr_to_kernel
  move_addr_to_user
  verify_iovec
  verify_compat_iovec
are always effectively called with a sockaddr_storage.

Make this explicit by changing their signature.

This removes a large number of casts from sockaddr_storage to sockaddr.
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/socket.h

@@ -326,11 +326,11 @@ extern int csum_partial_copy_fromiovecend(unsigned char *kdata,
 					  int offset, 
 					  unsigned int len, __wsum *csump);
 
-extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode);
+extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode);
 extern int memcpy_toiovec(struct iovec *v, unsigned char *kdata, int len);
 extern int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata,
 			     int offset, int len);
-extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr);
+extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
 extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
 
 struct timespec;

include/net/compat.h

@@ -41,7 +41,7 @@ extern int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
 #endif /* defined(CONFIG_COMPAT) */
 
 extern int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);
-extern int verify_compat_iovec(struct msghdr *, struct iovec *, struct sockaddr *, int);
+extern int verify_compat_iovec(struct msghdr *, struct iovec *, struct sockaddr_storage *, int);
 extern asmlinkage long compat_sys_sendmsg(int,struct compat_msghdr __user *,unsigned);
 extern asmlinkage long compat_sys_sendmmsg(int, struct compat_mmsghdr __user *,
 					   unsigned, unsigned);

net/compat.c

@@ -79,7 +79,7 @@ int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
 
 /* I've named the args so it is easy to tell whose space the pointers are in. */
 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
-		   struct sockaddr *kern_address, int mode)
+		   struct sockaddr_storage *kern_address, int mode)
 {
 	int tot_len;
 

net/core/iovec.c

@@ -35,7 +35,7 @@
  *	in any case.
  */
 
-int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode)
+int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode)
 {
 	int size, ct, err;
 

net/socket.c

@@ -181,7 +181,7 @@ static DEFINE_PER_CPU(int, sockets_in_use);
  *	invalid addresses -EFAULT is returned. On a success 0 is returned.
  */
 
-int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
+int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
 {
 	if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
 		return -EINVAL;
@@ -209,7 +209,7 @@ int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
  *	specified. Zero is returned for a success.
  */
 
-static int move_addr_to_user(struct sockaddr *kaddr, int klen,
+static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
 			     void __user *uaddr, int __user *ulen)
 {
 	int err;
@@ -1449,7 +1449,7 @@ SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
 
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (sock) {
-		err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
+		err = move_addr_to_kernel(umyaddr, addrlen, &address);
 		if (err >= 0) {
 			err = security_socket_bind(sock,
 						   (struct sockaddr *)&address,
@@ -1556,7 +1556,7 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
 			err = -ECONNABORTED;
 			goto out_fd;
 		}
-		err = move_addr_to_user((struct sockaddr *)&address,
+		err = move_addr_to_user(&address,
 					len, upeer_sockaddr, upeer_addrlen);
 		if (err < 0)
 			goto out_fd;
@@ -1605,7 +1605,7 @@ SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (!sock)
 		goto out;
-	err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
+	err = move_addr_to_kernel(uservaddr, addrlen, &address);
 	if (err < 0)
 		goto out_put;
 
@@ -1645,7 +1645,7 @@ SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
 	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
 	if (err)
 		goto out_put;
-	err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
+	err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
 
 out_put:
 	fput_light(sock->file, fput_needed);
@@ -1677,7 +1677,7 @@ SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
 		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
 				       1);
 		if (!err)
-			err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
+			err = move_addr_to_user(&address, len, usockaddr,
 						usockaddr_len);
 		fput_light(sock->file, fput_needed);
 	}
@@ -1716,7 +1716,7 @@ SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
 	msg.msg_controllen = 0;
 	msg.msg_namelen = 0;
 	if (addr) {
-		err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
+		err = move_addr_to_kernel(addr, addr_len, &address);
 		if (err < 0)
 			goto out_put;
 		msg.msg_name = (struct sockaddr *)&address;
@@ -1779,7 +1779,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
 	err = sock_recvmsg(sock, &msg, size, flags);
 
 	if (err >= 0 && addr != NULL) {
-		err2 = move_addr_to_user((struct sockaddr *)&address,
+		err2 = move_addr_to_user(&address,
 					 msg.msg_namelen, addr, addr_len);
 		if (err2 < 0)
 			err = err2;
@@ -1933,13 +1933,9 @@ static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
 
 	/* This will also move the address data into kernel space */
 	if (MSG_CMSG_COMPAT & flags) {
-		err = verify_compat_iovec(msg_sys, iov,
-					  (struct sockaddr *)&address,
-					  VERIFY_READ);
+		err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
 	} else
-		err = verify_iovec(msg_sys, iov,
-				   (struct sockaddr *)&address,
-				   VERIFY_READ);
+		err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
 	if (err < 0)
 		goto out_freeiov;
 	total_len = err;
@@ -2143,13 +2139,9 @@ static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
 	uaddr = (__force void __user *)msg_sys->msg_name;
 	uaddr_len = COMPAT_NAMELEN(msg);
 	if (MSG_CMSG_COMPAT & flags) {
-		err = verify_compat_iovec(msg_sys, iov,
-					  (struct sockaddr *)&addr,
-					  VERIFY_WRITE);
+		err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
 	} else
-		err = verify_iovec(msg_sys, iov,
-				   (struct sockaddr *)&addr,
-				   VERIFY_WRITE);
+		err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
 	if (err < 0)
 		goto out_freeiov;
 	total_len = err;
@@ -2166,7 +2158,7 @@ static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
 	len = err;
 
 	if (uaddr != NULL) {
-		err = move_addr_to_user((struct sockaddr *)&addr,
+		err = move_addr_to_user(&addr,
 					msg_sys->msg_namelen, uaddr,
 					uaddr_len);
 		if (err < 0)