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
57 #include <linux/socket.h>
136 	struct socket *sock = f->private_data;  in sock_show_fdinfo()
146 …*	Socket files have a set of 'special' operations as well as the generic file ones. These don't ap…
227  * Move socket addresses back and forth across the kernel/user
232  *	move_addr_to_kernel	-	copy a socket address into kernel space
306 	init_waitqueue_head(&ei->socket.wq.wait);  in sock_alloc_inode()
307 	ei->socket.wq.fasync_list = NULL;  in sock_alloc_inode()
308 	ei->socket.wq.flags = 0;  in sock_alloc_inode()
310 	ei->socket.state = SS_UNCONNECTED;  in sock_alloc_inode()
311 	ei->socket.flags = 0;  in sock_alloc_inode()
312 	ei->socket.ops = NULL;  in sock_alloc_inode()
313 	ei->socket.sk = NULL;  in sock_alloc_inode()
314 	ei->socket.file = NULL;  in sock_alloc_inode()
357 	return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",  in sockfs_dname()
434  *	to socket after mapping. If one day we will need it, this
444  *	sock_alloc_file - Bind a &socket to a &file
445  *	@sock: socket
455 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)  in sock_alloc_file()
477 static int sock_map_fd(struct socket *sock, int flags)  in sock_map_fd()
497  *	sock_from_file - Return the &socket bounded to @file.
503 struct socket *sock_from_file(struct file *file)  in sock_from_file()
513  *	sockfd_lookup - Go from a file number to its socket slot
517  *	The file handle passed in is locked and the socket it is bound
520  *	for both invalid handles and passing a handle which is not a socket.
522  *	On a success the socket object pointer is returned.
525 struct socket *sockfd_lookup(int fd, int *err)  in sockfd_lookup()
528 	struct socket *sock;  in sockfd_lookup()
545 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)  in sockfd_lookup_light()
548 	struct socket *sock;  in sockfd_lookup_light()
597 		struct socket *sock = SOCKET_I(d_inode(dentry));  in sockfs_setattr()
614  *	sock_alloc - allocate a socket
616  *	Allocate a new inode and socket object. The two are bound together
617  *	and initialised. The socket is then returned. If we are out of inodes
621 struct socket *sock_alloc(void)  in sock_alloc()
624 	struct socket *sock;  in sock_alloc()
642 static void __sock_release(struct socket *sock, struct inode *inode)  in __sock_release()
668  *	sock_release - close a socket
669  *	@sock: socket to close
671  *	The socket is released from the protocol stack if it has a release
672  *	callback, and the inode is then released if the socket is bound to
675 void sock_release(struct socket *sock)  in sock_release()
698 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
700 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
702 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)  in sock_sendmsg_nosec()
713  *	@sock: socket
719 int sock_sendmsg(struct socket *sock, struct msghdr *msg)  in sock_sendmsg()
730  *	@sock: socket
740 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,  in kernel_sendmsg()
764 	struct socket *sock = sk->sk_socket;  in kernel_sendmsg_locked()
779 	 * in recvmsg, since skbs received on a local socket will never  in skb_is_err_queue()
790  * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
937 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
939 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
941 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,  in sock_recvmsg_nosec()
951  *	@sock: socket
958 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)  in sock_recvmsg()
967  *	kernel_recvmsg - Receive a message from a socket (kernel space)
968  *	@sock: The socket to receive the message from
982 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,  in kernel_recvmsg()
994 	struct socket *sock;  in sock_sendpage()
1010 	struct socket *sock = file->private_data;  in sock_splice_read()
1021 	struct socket *sock = file->private_data;  in sock_read_iter()
1043 	struct socket *sock = file->private_data;  in sock_write_iter()
1109 static long sock_do_ioctl(struct net *net, struct socket *sock,  in sock_do_ioctl()
1147 	struct socket *sock;  in sock_ioctl()
1242  *	sock_create_lite - creates a socket
1246  *	@res: new socket
1248  *	Creates a new socket and assigns it to @res, passing through LSM.
1249  *	The new socket initialization is not complete, see kernel_accept().
1254 int sock_create_lite(int family, int type, int protocol, struct socket **res)  in sock_create_lite()
1257 	struct socket *sock = NULL;  in sock_create_lite()
1287 	struct socket *sock = file->private_data;  in sock_poll()
1298 		/* if this socket can poll_ll, tell the system call */  in sock_poll()
1307 	struct socket *sock = file->private_data;  in sock_mmap()
1319  *	Update the socket async list
1323  *	1. fasync_list is modified only under process context socket lock
1326  *	   or under socket lock
1331 	struct socket *sock = filp->private_data;  in sock_fasync()
1379  *	__sock_create - creates a socket
1384  *	@res: new socket
1387  *	Creates a new socket and assigns it to @res, passing through LSM.
1389  *	be set to true if the socket resides in kernel space.
1394 			 struct socket **res, int kern)  in __sock_create()
1397 	struct socket *sock;  in __sock_create()
1424 	 *	Allocate the socket and allow the family to set things up. if  in __sock_create()
1430 		net_warn_ratelimited("socket: no more sockets\n");  in __sock_create()
1470 	 * socket at sock_release time we decrement its refcnt.  in __sock_create()
1503  *	sock_create - creates a socket
1507  *	@res: new socket
1513 int sock_create(int family, int type, int protocol, struct socket **res)  in sock_create()
1520  *	sock_create_kern - creates a socket (kernel space)
1525  *	@res: new socket
1531 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)  in sock_create_kern()
1540 	struct socket *sock;  in __sys_socket()
1564 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)  in SYSCALL_DEFINE3()  argument
1575 	struct socket *sock1, *sock2;  in __sys_socketpair()
1611 	 * Obtain the first socket and check if the underlying protocol  in __sys_socketpair()
1672  *	Bind a name to a socket. Nothing much to do here since it's
1675  *	We move the socket address to kernel space before we call
1681 	struct socket *sock;  in __sys_bind()
1709  *	necessary for a listen, and if that works, we mark the socket as
1715 	struct socket *sock;  in __sys_listen()
1743 	struct socket *sock, *newsock;  in do_accept()
1760 	 * We don't need try_module_get here, as the listening socket (sock)  in do_accept()
1827  *	For accept, we attempt to create a new socket, set up the link
1831  *	we open the socket then return an error.
1868  *	Attempt to connect to a socket with the server address.  The address
1882 	struct socket *sock;  in __sys_connect_file()
1927  *	Get the local address ('name') of a socket object. Move the obtained
1934 	struct socket *sock;  in __sys_getsockname()
1965  *	Get the remote address ('name') of a socket object. Move the obtained
1972 	struct socket *sock;  in __sys_getpeername()
2008 	struct socket *sock;  in __sys_sendto()
2052  *	Send a datagram down a socket.
2062  *	Receive a frame from the socket and optionally record the address of the
2069 	struct socket *sock;  in __sys_recvfrom()
2115  *	Receive a datagram from a socket.
2124 static bool sock_use_custom_sol_socket(const struct socket *sock)  in sock_use_custom_sol_socket()
2136  *	Set a socket option. Because we don't know the option lengths we have
2145 	struct socket *sock;  in __sys_setsockopt()
2194  *	Get a socket option. Because we don't know the option lengths we have
2201 	struct socket *sock;  in __sys_getsockopt()
2239  *	Shutdown a socket.
2242 int __sys_shutdown_sock(struct socket *sock, int how)  in __sys_shutdown_sock()
2256 	struct socket *sock;  in __sys_shutdown()
2353 static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,  in ____sys_sendmsg()
2448 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,  in ___sys_sendmsg()
2472 long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,  in __sys_sendmsg_sock()
2483 	struct socket *sock;  in __sys_sendmsg()
2512 	struct socket *sock;  in __sys_sendmmsg()
2602 static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,  in ____sys_recvmsg()
2658 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,  in ___sys_recvmsg()
2679 long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,  in __sys_recvmsg_sock()
2691 	struct socket *sock;  in __sys_recvmsg()
2722 	struct socket *sock;  in do_recvmmsg()
3023  *	sock_register - add a socket protocol handler
3028  *	socket interface. The value ops->family corresponds to the
3029  *	socket system call protocol family.
3061  *	new socket creation.
3251 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,  in compat_sock_ioctl_trans()
3350 	struct socket *sock = file->private_data;  in compat_sock_ioctl()
3373  *	kernel_bind - bind an address to a socket (kernel space)
3374  *	@sock: socket
3381 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)  in kernel_bind()
3388  *	kernel_listen - move socket to listening state (kernel space)
3389  *	@sock: socket
3395 int kernel_listen(struct socket *sock, int backlog)  in kernel_listen()
3403  *	@sock: listening socket
3404  *	@newsock: new connected socket
3412 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)  in kernel_accept()
3438  *	kernel_connect - connect a socket (kernel space)
3439  *	@sock: socket
3450 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,  in kernel_connect()
3458  *	kernel_getsockname - get the address which the socket is bound (kernel space)
3459  *	@sock: socket
3462  * 	Fills the @addr pointer with the address which the socket is bound.
3466 int kernel_getsockname(struct socket *sock, struct sockaddr *addr)  in kernel_getsockname()
3473  *	kernel_getpeername - get the address which the socket is connected (kernel space)
3474  *	@sock: socket
3477  * 	Fills the @addr pointer with the address which the socket is connected.
3481 int kernel_getpeername(struct socket *sock, struct sockaddr *addr)  in kernel_getpeername()
3488  *	kernel_sendpage - send a &page through a socket (kernel space)
3489  *	@sock: socket
3498 int kernel_sendpage(struct socket *sock, struct page *page, int offset,  in kernel_sendpage()
3525 	struct socket *sock = sk->sk_socket;  in kernel_sendpage_locked()
3537  *	@sock: socket
3543 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)  in kernel_sock_shutdown()
3550  *	kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3551  *	@sk: socket
3553  *	This routine returns the IP overhead imposed by a socket i.e.
3555  *	this is an IPv4 or IPv6 socket and the length from IP options turned
3556  *	on at the socket. Assumes that the caller has a lock on the socket.
3592 	default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */  in kernel_sock_ip_overhead()