3  * NET		An implementation of the SOCKET network access protocol.
5  * Version:	@(#)socket.c	1.1.93	18/02/95
31  *		Linus		:	Argh. removed all the socket allocation
49  *	This module is effectively the top level interface to the BSD socket
58 #include <linux/socket.h>
141 	struct socket *sock = f->private_data;  in sock_show_fdinfo()
152 …*	Socket files have a set of 'special' operations as well as the generic file ones. These don't ap…
233  * Move socket addresses back and forth across the kernel/user
238  *	move_addr_to_kernel	-	copy a socket address into kernel space
312 	init_waitqueue_head(&ei->socket.wq.wait);  in sock_alloc_inode()
313 	ei->socket.wq.fasync_list = NULL;  in sock_alloc_inode()
314 	ei->socket.wq.flags = 0;  in sock_alloc_inode()
316 	ei->socket.state = SS_UNCONNECTED;  in sock_alloc_inode()
317 	ei->socket.flags = 0;  in sock_alloc_inode()
318 	ei->socket.ops = NULL;  in sock_alloc_inode()
319 	ei->socket.sk = NULL;  in sock_alloc_inode()
320 	ei->socket.file = NULL;  in sock_alloc_inode()
363 	return dynamic_dname(buffer, buflen, "socket:[%lu]",  in sockfs_dname()
440  *	to socket after mapping. If one day we will need it, this
450  *	sock_alloc_file - Bind a &socket to a &file
451  *	@sock: socket
463 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)  in sock_alloc_file()
491 static int sock_map_fd(struct socket *sock, int flags)  in sock_map_fd()
511  *	sock_from_file - Return the &socket bounded to @file.
517 struct socket *sock_from_file(struct file *file)  in sock_from_file()
527  *	sockfd_lookup - Go from a file number to its socket slot
531  *	The file handle passed in is locked and the socket it is bound
534  *	for both invalid handles and passing a handle which is not a socket.
536  *	On a success the socket object pointer is returned.
539 struct socket *sockfd_lookup(int fd, int *err)  in sockfd_lookup()
542 	struct socket *sock;  in sockfd_lookup()
593 		struct socket *sock = SOCKET_I(d_inode(dentry));  in sockfs_setattr()
610  *	sock_alloc - allocate a socket
612  *	Allocate a new inode and socket object. The two are bound together
613  *	and initialised. The socket is then returned. If we are out of inodes
617 struct socket *sock_alloc(void)  in sock_alloc()
620 	struct socket *sock;  in sock_alloc()
638 static void __sock_release(struct socket *sock, struct inode *inode)  in __sock_release()
666  *	sock_release - close a socket
667  *	@sock: socket to close
669  *	The socket is released from the protocol stack if it has a release
670  *	callback, and the inode is then released if the socket is bound to
673 void sock_release(struct socket *sock)  in sock_release()
688 		 * free running cycle counter for timestamp if socket is bound  in __sock_tx_timestamp()
705 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
707 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
716 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)  in sock_sendmsg_nosec()
728 static int __sock_sendmsg(struct socket *sock, struct msghdr *msg)  in __sock_sendmsg()
738  *	@sock: socket
744 int sock_sendmsg(struct socket *sock, struct msghdr *msg)  in sock_sendmsg()
766  *	@sock: socket
776 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,  in kernel_sendmsg()
788 	 * in recvmsg, since skbs received on a local socket will never  in skb_is_err_queue()
799  * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
1010 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
1012 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
1020 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,  in sock_recvmsg_nosec()
1034  *	@sock: socket
1041 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)  in sock_recvmsg()
1050  *	kernel_recvmsg - Receive a message from a socket (kernel space)
1051  *	@sock: The socket to receive the message from
1065 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,  in kernel_recvmsg()
1078 	struct socket *sock = file->private_data;  in sock_splice_read()
1090 	struct socket *sock = file->private_data;  in sock_splice_eof()
1101 	struct socket *sock = file->private_data;  in sock_read_iter()
1123 	struct socket *sock = file->private_data;  in sock_write_iter()
1186 static long sock_do_ioctl(struct net *net, struct socket *sock,  in sock_do_ioctl()
1226 	struct socket *sock;  in sock_ioctl()
1324  *	sock_create_lite - creates a socket
1328  *	@res: new socket
1330  *	Creates a new socket and assigns it to @res, passing through LSM.
1331  *	The new socket initialization is not complete, see kernel_accept().
1336 int sock_create_lite(int family, int type, int protocol, struct socket **res)  in sock_create_lite()
1339 	struct socket *sock = NULL;  in sock_create_lite()
1369 	struct socket *sock = file->private_data;  in sock_poll()
1381 		/* if this socket can poll_ll, tell the system call */  in sock_poll()
1390 	struct socket *sock = file->private_data;  in sock_mmap()
1402  *	Update the socket async list
1406  *	1. fasync_list is modified only under process context socket lock
1409  *	   or under socket lock
1414 	struct socket *sock = filp->private_data;  in sock_fasync()
1462  *	__sock_create - creates a socket
1467  *	@res: new socket
1470  *	Creates a new socket and assigns it to @res, passing through LSM.
1472  *	be set to true if the socket resides in kernel space.
1477 			 struct socket **res, int kern)  in __sock_create()
1480 	struct socket *sock;  in __sock_create()
1507 	 *	Allocate the socket and allow the family to set things up. if  in __sock_create()
1513 		net_warn_ratelimited("socket: no more sockets\n");  in __sock_create()
1560 	 * socket at sock_release time we decrement its refcnt.  in __sock_create()
1593  *	sock_create - creates a socket
1597  *	@res: new socket
1603 int sock_create(int family, int type, int protocol, struct socket **res)  in sock_create()
1610  *	sock_create_kern - creates a socket (kernel space)
1615  *	@res: new socket
1621 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)  in sock_create_kern()
1627 static struct socket *__sys_socket_create(int family, int type, int protocol)  in __sys_socket_create()
1629 	struct socket *sock;  in __sys_socket_create()
1651 	struct socket *sock;  in __sys_socket_file()
1665 /*	A hook for bpf progs to attach to and update socket protocol.
1686 	struct socket *sock;  in __sys_socket()
1701 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)  in SYSCALL_DEFINE3()  argument
1712 	struct socket *sock1, *sock2;  in __sys_socketpair()
1748 	 * Obtain the first socket and check if the underlying protocol  in __sys_socketpair()
1808 int __sys_bind_socket(struct socket *sock, struct sockaddr_storage *address,  in __sys_bind_socket()
1823  *	Bind a name to a socket. Nothing much to do here since it's
1826  *	We move the socket address to kernel space before we call
1832 	struct socket *sock;  in __sys_bind()
1857  *	necessary for a listen, and if that works, we mark the socket as
1860 int __sys_listen_socket(struct socket *sock, int backlog)  in __sys_listen_socket()
1877 	struct socket *sock;  in __sys_listen()
1897 	struct socket *sock, *newsock;  in do_accept()
1916 	 * We don't need try_module_get here, as the listening socket (sock)  in do_accept()
1981  *	For accept, we attempt to create a new socket, set up the link
1985  *	we open the socket then return an error.
2016  *	Attempt to connect to a socket with the server address.  The address
2030 	struct socket *sock;  in __sys_connect_file()
2073  *	Get the local address ('name') of a socket object. Move the obtained
2080 	struct socket *sock;  in __sys_getsockname()
2110  *	Get the remote address ('name') of a socket object. Move the obtained
2117 	struct socket *sock;  in __sys_getpeername()
2154 	struct socket *sock;  in __sys_sendto()
2197  *	Send a datagram down a socket.
2207  *	Receive a frame from the socket and optionally record the address of the
2219 	struct socket *sock;  in __sys_recvfrom()
2255  *	Receive a datagram from a socket.
2264 static bool sock_use_custom_sol_socket(const struct socket *sock)  in sock_use_custom_sol_socket()
2269 int do_sock_setsockopt(struct socket *sock, bool compat, int level,  in do_sock_setsockopt()
2310 /* Set a socket option. Because we don't know the option lengths we have
2318 	struct socket *sock;  in __sys_setsockopt()
2339 int do_sock_getsockopt(struct socket *sock, bool compat, int level,  in do_sock_getsockopt()
2377  *	Get a socket option. Because we don't know the option lengths we have
2383 	struct socket *sock;  in __sys_getsockopt()
2403  *	Shutdown a socket.
2406 int __sys_shutdown_sock(struct socket *sock, int how)  in __sys_shutdown_sock()
2419 	struct socket *sock;  in __sys_shutdown()
2515 static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,  in ____sys_sendmsg()
2611 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,  in ___sys_sendmsg()
2635 long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,  in __sys_sendmsg_sock()
2645 	struct socket *sock;  in __sys_sendmsg()
2674 	struct socket *sock;  in __sys_sendmmsg()
2766 static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,  in ____sys_recvmsg()
2822 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,  in ___sys_recvmsg()
2843 long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,  in __sys_recvmsg_sock()
2854 	struct socket *sock;  in __sys_recvmsg()
2885 	struct socket *sock;  in do_recvmmsg()
3183  *	sock_register - add a socket protocol handler
3188  *	socket interface. The value ops->family corresponds to the
3189  *	socket system call protocol family.
3221  *	new socket creation.
3396 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,  in compat_sock_ioctl_trans()
3496 	struct socket *sock = file->private_data;  in compat_sock_ioctl()
3520  *	kernel_bind - bind an address to a socket (kernel space)
3521  *	@sock: socket
3528 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)  in kernel_bind()
3540  *	kernel_listen - move socket to listening state (kernel space)
3541  *	@sock: socket
3547 int kernel_listen(struct socket *sock, int backlog)  in kernel_listen()
3555  *	@sock: listening socket
3556  *	@newsock: new connected socket
3564 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)  in kernel_accept()
3595  *	kernel_connect - connect a socket (kernel space)
3596  *	@sock: socket
3607 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,  in kernel_connect()
3620  *	kernel_getsockname - get the address which the socket is bound (kernel space)
3621  *	@sock: socket
3624  * 	Fills the @addr pointer with the address which the socket is bound.
3628 int kernel_getsockname(struct socket *sock, struct sockaddr *addr)  in kernel_getsockname()
3635  *	kernel_getpeername - get the address which the socket is connected (kernel space)
3636  *	@sock: socket
3639  * 	Fills the @addr pointer with the address which the socket is connected.
3643 int kernel_getpeername(struct socket *sock, struct sockaddr *addr)  in kernel_getpeername()
3651  *	@sock: socket
3657 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)  in kernel_sock_shutdown()
3664  *	kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3665  *	@sk: socket
3667  *	This routine returns the IP overhead imposed by a socket i.e.
3669  *	this is an IPv4 or IPv6 socket and the length from IP options turned
3670  *	on at the socket. Assumes that the caller has a lock on the socket.
3706 	default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */  in kernel_sock_ip_overhead()