linux-master/net/socket.c

59 #include <linux/file.h>
120 static int sock_mmap(struct file *file, struct vm_area_struct *vma);
122 static int sock_close(struct inode *inode, struct file *file);
123 static __poll_t sock_poll(struct file *file,
125 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
127 static long compat_sock_ioctl(struct file *file,
130 static int sock_fasync(int fd, struct file *filp, int on);
131 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
134 static void sock_splice_eof(struct file *file);
137 static void sock_show_fdinfo(struct seq_file *m, struct file *f)
150  *	Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
319 	ei->socket.file = NULL;
432  *	Obtains the first available file descriptor and sets it up for use.
434  *	These functions create file structures and maps them to fd space
435  *	of the current process. On success it returns file descriptor
436  *	and file struct implicitly stored in sock->file.
437  *	Note that another thread may close file descriptor before we return
440  *	function will increment ref. count on file by 1.
449  *	sock_alloc_file - Bind a &socket to a &file
451  *	@flags: file status flags
454  *	Returns the &file bound with @sock, implicitly storing it
455  *	in sock->file. If dname is %NULL, sets to "".
462 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
464 	struct file *file;
469 	file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
472 	if (IS_ERR(file)) {
474 		return file;
477 	file->f_mode |= FMODE_NOWAIT;
478 	sock->file = file;
479 	file->private_data = sock;
480 	stream_open(SOCK_INODE(sock), file);
481 	return file;
487 	struct file *newfile;
505  *	sock_from_file - Return the &socket bounded to @file.
506  *	@file: file
511 struct socket *sock_from_file(struct file *file)
513 	if (file->f_op == &socket_file_ops)
514 		return file->private_data;	/* set in sock_alloc_file */
521  *	sockfd_lookup - Go from a file number to its socket slot
522  *	@fd: file handle
525  *	The file handle passed in is locked and the socket it is bound
535 	struct file *file;
538 	file = fget(fd);
539 	if (!file) {
544 	sock = sock_from_file(file);
547 		fput(file);
559 	if (f.file) {
560 		sock = sock_from_file(f.file);
670 	if (!sock->file) {
674 	sock->file = NULL;
683  *	an inode not a file.
1097 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
1101 	struct socket *sock = file->private_data;
1106 		return copy_splice_read(file, ppos, pipe, len, flags);
1111 static void sock_splice_eof(struct file *file)
1113 	struct socket *sock = file->private_data;
1123 	struct file *file = iocb->ki_filp;
1124 	struct socket *sock = file->private_data;
1129 	if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
1145 	struct file *file = iocb->ki_filp;
1146 	struct socket *sock = file->private_data;
1154 	if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
1249 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1258 	sock = file->private_data;
1284 			err = f_setown(sock->file, pid, 1);
1288 			err = put_user(f_getown(sock->file),
1391 static __poll_t sock_poll(struct file *file, poll_table *wait)
1393 	struct socket *sock = file->private_data;
1409 	return ops->poll(file, sock, wait) | flag;
1412 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1414 	struct socket *sock = file->private_data;
1416 	return READ_ONCE(sock->ops)->mmap(file, sock, vma);
1419 static int sock_close(struct inode *inode, struct file *filp)
1436 static int sock_fasync(int fd, struct file *filp, int on)
1666 struct file *__sys_socket_file(int family, int type, int protocol)
1731 	struct file *newfile1, *newfile2;
1851 		fput_light(sock->file, fput_needed);
1883 		fput_light(sock->file, fput_needed);
1893 struct file *do_accept(struct file *file, unsigned file_flags,
1898 	struct file *newfile;
1903 	sock = sock_from_file(file);
1929 	err = ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1953 static int __sys_accept4_file(struct file *file, struct sockaddr __user *upeer_sockaddr,
1956 	struct file *newfile;
1969 	newfile = do_accept(file, 0, upeer_sockaddr, upeer_addrlen,
1998 	if (f.file) {
1999 		ret = __sys_accept4_file(f.file, upeer_sockaddr,
2031 int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
2037 	sock = sock_from_file(file);
2049 				addrlen, sock->file->f_flags | file_flags);
2060 	if (f.file) {
2065 			ret = __sys_connect_file(f.file, &address, addrlen, 0);
2105 	fput_light(sock->file, fput_needed);
2134 			fput_light(sock->file, fput_needed);
2143 		fput_light(sock->file, fput_needed);
2188 	if (sock->file->f_flags & O_NONBLOCK)
2194 	fput_light(sock->file, fput_needed);
2240 	if (sock->file->f_flags & O_NONBLOCK)
2251 	fput_light(sock->file, fput_needed);
2336 	fput_light(sock->file, fput_needed);
2405 	fput_light(sock->file, fput_needed);
2438 		fput_light(sock->file, fput_needed);
2569 	if (sock->file->f_flags & O_NONBLOCK)
2669 	fput_light(sock->file, fput_needed);
2741 	fput_light(sock->file, fput_needed);
2797 	if (sock->file->f_flags & O_NONBLOCK)
2877 	fput_light(sock->file, fput_needed);
2998 	fput_light(sock->file, fput_needed);
3411 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3420 		return sock_ioctl(file, cmd, (unsigned long)argp);
3454 		return sock_ioctl(file, cmd, arg);
3508 static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3511 	struct socket *sock = file->private_data;
3528 		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);