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
56 #include <linux/socket.h>
135 	struct socket *sock = f->private_data;  in sock_show_fdinfo()
145 …*	Socket files have a set of 'special' operations as well as the generic file ones. These don't ap…
177  * Move socket addresses back and forth across the kernel/user
182  *	move_addr_to_kernel	-	copy a socket address into kernel space
256 	init_waitqueue_head(&ei->socket.wq.wait);  in sock_alloc_inode()
257 	ei->socket.wq.fasync_list = NULL;  in sock_alloc_inode()
258 	ei->socket.wq.flags = 0;  in sock_alloc_inode()
260 	ei->socket.state = SS_UNCONNECTED;  in sock_alloc_inode()
261 	ei->socket.flags = 0;  in sock_alloc_inode()
262 	ei->socket.ops = NULL;  in sock_alloc_inode()
263 	ei->socket.sk = NULL;  in sock_alloc_inode()
264 	ei->socket.file = NULL;  in sock_alloc_inode()
307 	return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",  in sockfs_dname()
384  *	to socket after mapping. If one day we will need it, this
394  *	sock_alloc_file - Bind a &socket to a &file
395  *	@sock: socket
405 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)  in sock_alloc_file()
427 static int sock_map_fd(struct socket *sock, int flags)  in sock_map_fd()
447  *	sock_from_file - Return the &socket bounded to @file.
454 struct socket *sock_from_file(struct file *file, int *err)  in sock_from_file()
465  *	sockfd_lookup - Go from a file number to its socket slot
469  *	The file handle passed in is locked and the socket it is bound
472  *	for both invalid handles and passing a handle which is not a socket.
474  *	On a success the socket object pointer is returned.
477 struct socket *sockfd_lookup(int fd, int *err)  in sockfd_lookup()
480 	struct socket *sock;  in sockfd_lookup()
495 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)  in sockfd_lookup_light()
498 	struct socket *sock;  in sockfd_lookup_light()
545 		struct socket *sock = SOCKET_I(d_inode(dentry));  in sockfs_setattr()
562  *	sock_alloc - allocate a socket
564  *	Allocate a new inode and socket object. The two are bound together
565  *	and initialised. The socket is then returned. If we are out of inodes
569 struct socket *sock_alloc(void)  in sock_alloc()
572 	struct socket *sock;  in sock_alloc()
590 static void __sock_release(struct socket *sock, struct inode *inode)  in __sock_release()
616  *	sock_release - close a socket
617  *	@sock: socket to close
619  *	The socket is released from the protocol stack if it has a release
620  *	callback, and the inode is then released if the socket is bound to
623 void sock_release(struct socket *sock)  in sock_release()
646 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
648 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
650 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)  in sock_sendmsg_nosec()
661  *	@sock: socket
667 int sock_sendmsg(struct socket *sock, struct msghdr *msg)  in sock_sendmsg()
678  *	@sock: socket
688 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,  in kernel_sendmsg()
712 	struct socket *sock = sk->sk_socket;  in kernel_sendmsg_locked()
727 	 * in recvmsg, since skbs received on a local socket will never  in skb_is_err_queue()
738  * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
879 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
881 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
883 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,  in sock_recvmsg_nosec()
893  *	@sock: socket
900 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)  in sock_recvmsg()
909  *	kernel_recvmsg - Receive a message from a socket (kernel space)
910  *	@sock: The socket to receive the message from
924 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,  in kernel_recvmsg()
936 	struct socket *sock;  in sock_sendpage()
952 	struct socket *sock = file->private_data;  in sock_splice_read()
963 	struct socket *sock = file->private_data;  in sock_read_iter()
985 	struct socket *sock = file->private_data;  in sock_write_iter()
1042 static long sock_do_ioctl(struct net *net, struct socket *sock,  in sock_do_ioctl()
1088 	struct socket *sock;  in sock_ioctl()
1195  *	sock_create_lite - creates a socket
1199  *	@res: new socket
1201  *	Creates a new socket and assigns it to @res, passing through LSM.
1202  *	The new socket initialization is not complete, see kernel_accept().
1207 int sock_create_lite(int family, int type, int protocol, struct socket **res)  in sock_create_lite()
1210 	struct socket *sock = NULL;  in sock_create_lite()
1240 	struct socket *sock = file->private_data;  in sock_poll()
1251 		/* if this socket can poll_ll, tell the system call */  in sock_poll()
1260 	struct socket *sock = file->private_data;  in sock_mmap()
1272  *	Update the socket async list
1276  *	1. fasync_list is modified only under process context socket lock
1279  *	   or under socket lock
1284 	struct socket *sock = filp->private_data;  in sock_fasync()
1332  *	__sock_create - creates a socket
1337  *	@res: new socket
1340  *	Creates a new socket and assigns it to @res, passing through LSM.
1342  *	be set to true if the socket resides in kernel space.
1347 			 struct socket **res, int kern)  in __sock_create()
1350 	struct socket *sock;  in __sock_create()
1377 	 *	Allocate the socket and allow the family to set things up. if  in __sock_create()
1383 		net_warn_ratelimited("socket: no more sockets\n");  in __sock_create()
1423 	 * socket at sock_release time we decrement its refcnt.  in __sock_create()
1456  *	sock_create - creates a socket
1460  *	@res: new socket
1466 int sock_create(int family, int type, int protocol, struct socket **res)  in sock_create()
1473  *	sock_create_kern - creates a socket (kernel space)
1478  *	@res: new socket
1484 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)  in sock_create_kern()
1493 	struct socket *sock;  in __sys_socket()
1517 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)  in SYSCALL_DEFINE3()  argument
1528 	struct socket *sock1, *sock2;  in __sys_socketpair()
1564 	 * Obtain the first socket and check if the underlying protocol  in __sys_socketpair()
1625  *	Bind a name to a socket. Nothing much to do here since it's
1628  *	We move the socket address to kernel space before we call
1634 	struct socket *sock;  in __sys_bind()
1662  *	necessary for a listen, and if that works, we mark the socket as
1668 	struct socket *sock;  in __sys_listen()
1696 	struct socket *sock, *newsock;  in do_accept()
1713 	 * We don't need try_module_get here, as the listening socket (sock)  in do_accept()
1780  *	For accept, we attempt to create a new socket, set up the link
1784  *	we open the socket then return an error.
1821  *	Attempt to connect to a socket with the server address.  The address
1835 	struct socket *sock;  in __sys_connect_file()
1878  *	Get the local address ('name') of a socket object. Move the obtained
1885 	struct socket *sock;  in __sys_getsockname()
1916  *	Get the remote address ('name') of a socket object. Move the obtained
1923 	struct socket *sock;  in __sys_getpeername()
1959 	struct socket *sock;  in __sys_sendto()
2003  *	Send a datagram down a socket.
2013  *	Receive a frame from the socket and optionally record the address of the
2020 	struct socket *sock;  in __sys_recvfrom()
2066  *	Receive a datagram from a socket.
2075 static bool sock_use_custom_sol_socket(const struct socket *sock)  in sock_use_custom_sol_socket()
2087  *	Set a socket option. Because we don't know the option lengths we have
2096 	struct socket *sock;  in __sys_setsockopt()
2142  *	Get a socket option. Because we don't know the option lengths we have
2149 	struct socket *sock;  in __sys_getsockopt()
2187  *	Shutdown a socket.
2190 int __sys_shutdown_sock(struct socket *sock, int how)  in __sys_shutdown_sock()
2204 	struct socket *sock;  in __sys_shutdown()
2301 static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,  in ____sys_sendmsg()
2396 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,  in ___sys_sendmsg()
2420 long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,  in __sys_sendmsg_sock()
2431 	struct socket *sock;  in __sys_sendmsg()
2460 	struct socket *sock;  in __sys_sendmmsg()
2550 static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,  in ____sys_recvmsg()
2606 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,  in ___sys_recvmsg()
2627 long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,  in __sys_recvmsg_sock()
2639 	struct socket *sock;  in __sys_recvmsg()
2670 	struct socket *sock;  in do_recvmmsg()
2971  *	sock_register - add a socket protocol handler
2976  *	socket interface. The value ops->family corresponds to the
2977  *	socket system call protocol family.
3009  *	new socket creation.
3163 static int compat_ifreq_ioctl(struct net *net, struct socket *sock,  in compat_ifreq_ioctl()
3260 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,  in compat_sock_ioctl_trans()
3365 	struct socket *sock = file->private_data;  in compat_sock_ioctl()
3388  *	kernel_bind - bind an address to a socket (kernel space)
3389  *	@sock: socket
3396 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)  in kernel_bind()
3403  *	kernel_listen - move socket to listening state (kernel space)
3404  *	@sock: socket
3410 int kernel_listen(struct socket *sock, int backlog)  in kernel_listen()
3418  *	@sock: listening socket
3419  *	@newsock: new connected socket
3427 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)  in kernel_accept()
3453  *	kernel_connect - connect a socket (kernel space)
3454  *	@sock: socket
3465 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,  in kernel_connect()
3473  *	kernel_getsockname - get the address which the socket is bound (kernel space)
3474  *	@sock: socket
3477  * 	Fills the @addr pointer with the address which the socket is bound.
3481 int kernel_getsockname(struct socket *sock, struct sockaddr *addr)  in kernel_getsockname()
3488  *	kernel_getpeername - get the address which the socket is connected (kernel space)
3489  *	@sock: socket
3492  * 	Fills the @addr pointer with the address which the socket is connected.
3496 int kernel_getpeername(struct socket *sock, struct sockaddr *addr)  in kernel_getpeername()
3503  *	kernel_sendpage - send a &page through a socket (kernel space)
3504  *	@sock: socket
3513 int kernel_sendpage(struct socket *sock, struct page *page, int offset,  in kernel_sendpage()
3540 	struct socket *sock = sk->sk_socket;  in kernel_sendpage_locked()
3552  *	@sock: socket
3558 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)  in kernel_sock_shutdown()
3565  *	kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3566  *	@sk: socket
3568  *	This routine returns the IP overhead imposed by a socket i.e.
3570  *	this is an IPv4 or IPv6 socket and the length from IP options turned
3571  *	on at the socket. Assumes that the caller has a lock on the socket.
3607 	default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */  in kernel_sock_ip_overhead()