socket.c 78.7 KB
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/*
 * NET		An implementation of the SOCKET network access protocol.
 *
 * Version:	@(#)socket.c	1.1.93	18/02/95
 *
 * Authors:	Orest Zborowski, <obz@Kodak.COM>
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 *		Ross Biro
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 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 * Fixes:
 *		Anonymous	:	NOTSOCK/BADF cleanup. Error fix in
 *					shutdown()
 *		Alan Cox	:	verify_area() fixes
 *		Alan Cox	:	Removed DDI
 *		Jonathan Kamens	:	SOCK_DGRAM reconnect bug
 *		Alan Cox	:	Moved a load of checks to the very
 *					top level.
 *		Alan Cox	:	Move address structures to/from user
 *					mode above the protocol layers.
 *		Rob Janssen	:	Allow 0 length sends.
 *		Alan Cox	:	Asynchronous I/O support (cribbed from the
 *					tty drivers).
 *		Niibe Yutaka	:	Asynchronous I/O for writes (4.4BSD style)
 *		Jeff Uphoff	:	Made max number of sockets command-line
 *					configurable.
 *		Matti Aarnio	:	Made the number of sockets dynamic,
 *					to be allocated when needed, and mr.
 *					Uphoff's max is used as max to be
 *					allowed to allocate.
 *		Linus		:	Argh. removed all the socket allocation
 *					altogether: it's in the inode now.
 *		Alan Cox	:	Made sock_alloc()/sock_release() public
 *					for NetROM and future kernel nfsd type
 *					stuff.
 *		Alan Cox	:	sendmsg/recvmsg basics.
 *		Tom Dyas	:	Export net symbols.
 *		Marcin Dalecki	:	Fixed problems with CONFIG_NET="n".
 *		Alan Cox	:	Added thread locking to sys_* calls
 *					for sockets. May have errors at the
 *					moment.
 *		Kevin Buhr	:	Fixed the dumb errors in the above.
 *		Andi Kleen	:	Some small cleanups, optimizations,
 *					and fixed a copy_from_user() bug.
 *		Tigran Aivazian	:	sys_send(args) calls sys_sendto(args, NULL, 0)
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 *		Tigran Aivazian	:	Made listen(2) backlog sanity checks
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 *					protocol-independent
 *
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *
 *	This module is effectively the top level interface to the BSD socket
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 *	paradigm.
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 *
 *	Based upon Swansea University Computer Society NET3.039
 */

#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/file.h>
#include <linux/net.h>
#include <linux/interrupt.h>
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#include <linux/thread_info.h>
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#include <linux/rcupdate.h>
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#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/mutex.h>
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#include <linux/wanrouter.h>
#include <linux/if_bridge.h>
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#include <linux/if_frad.h>
#include <linux/if_vlan.h>
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#include <linux/init.h>
#include <linux/poll.h>
#include <linux/cache.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/kmod.h>
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#include <linux/audit.h>
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#include <linux/wireless.h>
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#include <linux/nsproxy.h>
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#include <linux/magic.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
#include <asm/unistd.h>

#include <net/compat.h>
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#include <net/wext.h>
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#include <net/cls_cgroup.h>
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#include <net/sock.h>
#include <linux/netfilter.h>

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#include <linux/if_tun.h>
#include <linux/ipv6_route.h>
#include <linux/route.h>
#include <linux/sockios.h>
#include <linux/atalk.h>

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static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
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static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
			 unsigned long nr_segs, loff_t pos);
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos);
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static int sock_mmap(struct file *file, struct vm_area_struct *vma);
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static int sock_close(struct inode *inode, struct file *file);
static unsigned int sock_poll(struct file *file,
			      struct poll_table_struct *wait);
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static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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#ifdef CONFIG_COMPAT
static long compat_sock_ioctl(struct file *file,
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			      unsigned int cmd, unsigned long arg);
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#endif
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static int sock_fasync(int fd, struct file *filp, int on);
static ssize_t sock_sendpage(struct file *file, struct page *page,
			     int offset, size_t size, loff_t *ppos, int more);
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static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
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				struct pipe_inode_info *pipe, size_t len,
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				unsigned int flags);
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/*
 *	Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
 *	in the operation structures but are done directly via the socketcall() multiplexor.
 */

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static const struct file_operations socket_file_ops = {
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	.owner =	THIS_MODULE,
	.llseek =	no_llseek,
	.aio_read =	sock_aio_read,
	.aio_write =	sock_aio_write,
	.poll =		sock_poll,
	.unlocked_ioctl = sock_ioctl,
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#ifdef CONFIG_COMPAT
	.compat_ioctl = compat_sock_ioctl,
#endif
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	.mmap =		sock_mmap,
	.open =		sock_no_open,	/* special open code to disallow open via /proc */
	.release =	sock_close,
	.fasync =	sock_fasync,
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	.sendpage =	sock_sendpage,
	.splice_write = generic_splice_sendpage,
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	.splice_read =	sock_splice_read,
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};

/*
 *	The protocol list. Each protocol is registered in here.
 */

static DEFINE_SPINLOCK(net_family_lock);
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static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
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/*
 *	Statistics counters of the socket lists
 */

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static DEFINE_PER_CPU(int, sockets_in_use);
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/*
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 * Support routines.
 * Move socket addresses back and forth across the kernel/user
 * divide and look after the messy bits.
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 */

/**
 *	move_addr_to_kernel	-	copy a socket address into kernel space
 *	@uaddr: Address in user space
 *	@kaddr: Address in kernel space
 *	@ulen: Length in user space
 *
 *	The address is copied into kernel space. If the provided address is
 *	too long an error code of -EINVAL is returned. If the copy gives
 *	invalid addresses -EFAULT is returned. On a success 0 is returned.
 */

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int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
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{
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	if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
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		return -EINVAL;
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	if (ulen == 0)
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		return 0;
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	if (copy_from_user(kaddr, uaddr, ulen))
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		return -EFAULT;
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	return audit_sockaddr(ulen, kaddr);
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}

/**
 *	move_addr_to_user	-	copy an address to user space
 *	@kaddr: kernel space address
 *	@klen: length of address in kernel
 *	@uaddr: user space address
 *	@ulen: pointer to user length field
 *
 *	The value pointed to by ulen on entry is the buffer length available.
 *	This is overwritten with the buffer space used. -EINVAL is returned
 *	if an overlong buffer is specified or a negative buffer size. -EFAULT
 *	is returned if either the buffer or the length field are not
 *	accessible.
 *	After copying the data up to the limit the user specifies, the true
 *	length of the data is written over the length limit the user
 *	specified. Zero is returned for a success.
 */
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static int move_addr_to_user(struct sockaddr *kaddr, int klen,
			     void __user *uaddr, int __user *ulen)
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{
	int err;
	int len;

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	err = get_user(len, ulen);
	if (err)
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		return err;
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	if (len > klen)
		len = klen;
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	if (len < 0 || len > sizeof(struct sockaddr_storage))
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		return -EINVAL;
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	if (len) {
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		if (audit_sockaddr(klen, kaddr))
			return -ENOMEM;
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		if (copy_to_user(uaddr, kaddr, len))
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			return -EFAULT;
	}
	/*
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	 *      "fromlen shall refer to the value before truncation.."
	 *                      1003.1g
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	 */
	return __put_user(klen, ulen);
}

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static struct kmem_cache *sock_inode_cachep __read_mostly;
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static struct inode *sock_alloc_inode(struct super_block *sb)
{
	struct socket_alloc *ei;
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	struct socket_wq *wq;
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	ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
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	if (!ei)
		return NULL;
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	wq = kmalloc(sizeof(*wq), GFP_KERNEL);
	if (!wq) {
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		kmem_cache_free(sock_inode_cachep, ei);
		return NULL;
	}
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	init_waitqueue_head(&wq->wait);
	wq->fasync_list = NULL;
	RCU_INIT_POINTER(ei->socket.wq, wq);
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	ei->socket.state = SS_UNCONNECTED;
	ei->socket.flags = 0;
	ei->socket.ops = NULL;
	ei->socket.sk = NULL;
	ei->socket.file = NULL;

	return &ei->vfs_inode;
}

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static void wq_free_rcu(struct rcu_head *head)
{
	struct socket_wq *wq = container_of(head, struct socket_wq, rcu);

	kfree(wq);
}

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static void sock_destroy_inode(struct inode *inode)
{
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	struct socket_alloc *ei;
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	struct socket_wq *wq;
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	ei = container_of(inode, struct socket_alloc, vfs_inode);
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	wq = rcu_dereference_protected(ei->socket.wq, 1);
	call_rcu(&wq->rcu, wq_free_rcu);
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	kmem_cache_free(sock_inode_cachep, ei);
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}

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static void init_once(void *foo)
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{
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	struct socket_alloc *ei = (struct socket_alloc *)foo;
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	inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
{
	sock_inode_cachep = kmem_cache_create("sock_inode_cache",
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					      sizeof(struct socket_alloc),
					      0,
					      (SLAB_HWCACHE_ALIGN |
					       SLAB_RECLAIM_ACCOUNT |
					       SLAB_MEM_SPREAD),
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					      init_once);
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	if (sock_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

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static const struct super_operations sockfs_ops = {
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	.alloc_inode	= sock_alloc_inode,
	.destroy_inode	= sock_destroy_inode,
	.statfs		= simple_statfs,
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};

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/*
 * sockfs_dname() is called from d_path().
 */
static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
{
	return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
				dentry->d_inode->i_ino);
}

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static const struct dentry_operations sockfs_dentry_operations = {
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	.d_dname  = sockfs_dname,
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};

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static struct dentry *sockfs_mount(struct file_system_type *fs_type,
			 int flags, const char *dev_name, void *data)
{
	return mount_pseudo(fs_type, "socket:", &sockfs_ops,
		&sockfs_dentry_operations, SOCKFS_MAGIC);
}

static struct vfsmount *sock_mnt __read_mostly;

static struct file_system_type sock_fs_type = {
	.name =		"sockfs",
	.mount =	sockfs_mount,
	.kill_sb =	kill_anon_super,
};

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/*
 *	Obtains the first available file descriptor and sets it up for use.
 *
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 *	These functions create file structures and maps them to fd space
 *	of the current process. On success it returns file descriptor
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 *	and file struct implicitly stored in sock->file.
 *	Note that another thread may close file descriptor before we return
 *	from this function. We use the fact that now we do not refer
 *	to socket after mapping. If one day we will need it, this
 *	function will increment ref. count on file by 1.
 *
 *	In any case returned fd MAY BE not valid!
 *	This race condition is unavoidable
 *	with shared fd spaces, we cannot solve it inside kernel,
 *	but we take care of internal coherence yet.
 */

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static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
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{
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	struct qstr name = { .name = "" };
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	struct path path;
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	struct file *file;
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	int fd;

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	fd = get_unused_fd_flags(flags);
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	if (unlikely(fd < 0))
		return fd;
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	path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
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	if (unlikely(!path.dentry)) {
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		put_unused_fd(fd);
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		return -ENOMEM;
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	}
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	path.mnt = mntget(sock_mnt);
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	d_instantiate(path.dentry, SOCK_INODE(sock));
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	SOCK_INODE(sock)->i_fop = &socket_file_ops;
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	file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
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		  &socket_file_ops);
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	if (unlikely(!file)) {
		/* drop dentry, keep inode */
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		ihold(path.dentry->d_inode);
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		path_put(&path);
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		put_unused_fd(fd);
		return -ENFILE;
	}

	sock->file = file;
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	file->f_flags = O_RDWR | (flags & O_NONBLOCK);
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	file->f_pos = 0;
	file->private_data = sock;
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	*f = file;
	return fd;
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}

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int sock_map_fd(struct socket *sock, int flags)
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{
	struct file *newfile;
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	int fd = sock_alloc_file(sock, &newfile, flags);
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	if (likely(fd >= 0))
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		fd_install(fd, newfile);
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	return fd;
}
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EXPORT_SYMBOL(sock_map_fd);
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static struct socket *sock_from_file(struct file *file, int *err)
{
	if (file->f_op == &socket_file_ops)
		return file->private_data;	/* set in sock_map_fd */

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	*err = -ENOTSOCK;
	return NULL;
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}

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/**
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 *	sockfd_lookup - Go from a file number to its socket slot
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 *	@fd: file handle
 *	@err: pointer to an error code return
 *
 *	The file handle passed in is locked and the socket it is bound
 *	too is returned. If an error occurs the err pointer is overwritten
 *	with a negative errno code and NULL is returned. The function checks
 *	for both invalid handles and passing a handle which is not a socket.
 *
 *	On a success the socket object pointer is returned.
 */

struct socket *sockfd_lookup(int fd, int *err)
{
	struct file *file;
	struct socket *sock;

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	file = fget(fd);
	if (!file) {
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		*err = -EBADF;
		return NULL;
	}
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	sock = sock_from_file(file, err);
	if (!sock)
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		fput(file);
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	return sock;
}
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EXPORT_SYMBOL(sockfd_lookup);
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static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
{
	struct file *file;
	struct socket *sock;

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	*err = -EBADF;
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	file = fget_light(fd, fput_needed);
	if (file) {
		sock = sock_from_file(file, err);
		if (sock)
			return sock;
		fput_light(file, *fput_needed);
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	}
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	return NULL;
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}

/**
 *	sock_alloc	-	allocate a socket
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 *
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 *	Allocate a new inode and socket object. The two are bound together
 *	and initialised. The socket is then returned. If we are out of inodes
 *	NULL is returned.
 */

static struct socket *sock_alloc(void)
{
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	struct inode *inode;
	struct socket *sock;
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	inode = new_inode(sock_mnt->mnt_sb);
	if (!inode)
		return NULL;

	sock = SOCKET_I(inode);

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	kmemcheck_annotate_bitfield(sock, type);
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	inode->i_ino = get_next_ino();
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	inode->i_mode = S_IFSOCK | S_IRWXUGO;
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	inode->i_uid = current_fsuid();
	inode->i_gid = current_fsgid();
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	percpu_add(sockets_in_use, 1);
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	return sock;
}

/*
 *	In theory you can't get an open on this inode, but /proc provides
 *	a back door. Remember to keep it shut otherwise you'll let the
 *	creepy crawlies in.
 */
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static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
{
	return -ENXIO;
}

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const struct file_operations bad_sock_fops = {
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	.owner = THIS_MODULE,
	.open = sock_no_open,
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	.llseek = noop_llseek,
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};

/**
 *	sock_release	-	close a socket
 *	@sock: socket to close
 *
 *	The socket is released from the protocol stack if it has a release
 *	callback, and the inode is then released if the socket is bound to
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 *	an inode not a file.
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 */
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void sock_release(struct socket *sock)
{
	if (sock->ops) {
		struct module *owner = sock->ops->owner;

		sock->ops->release(sock);
		sock->ops = NULL;
		module_put(owner);
	}

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	if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
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		printk(KERN_ERR "sock_release: fasync list not empty!\n");

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	percpu_sub(sockets_in_use, 1);
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	if (!sock->file) {
		iput(SOCK_INODE(sock));
		return;
	}
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	sock->file = NULL;
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}
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EXPORT_SYMBOL(sock_release);
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int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
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{
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	*tx_flags = 0;
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	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
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		*tx_flags |= SKBTX_HW_TSTAMP;
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	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
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		*tx_flags |= SKBTX_SW_TSTAMP;
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	return 0;
}
EXPORT_SYMBOL(sock_tx_timestamp);

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static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
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				 struct msghdr *msg, size_t size)
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);
	int err;

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	sock_update_classid(sock->sk);

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	si->sock = sock;
	si->scm = NULL;
	si->msg = msg;
	si->size = size;

	err = security_socket_sendmsg(sock, msg, size);
	if (err)
		return err;

	return sock->ops->sendmsg(iocb, sock, msg, size);
}

int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

	init_sync_kiocb(&iocb, NULL);
	iocb.private = &siocb;
	ret = __sock_sendmsg(&iocb, sock, msg, size);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
587
EXPORT_SYMBOL(sock_sendmsg);
L
Linus Torvalds 已提交
588 589 590 591 592 593 594 595 596 597 598 599

int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
		   struct kvec *vec, size_t num, size_t size)
{
	mm_segment_t oldfs = get_fs();
	int result;

	set_fs(KERNEL_DS);
	/*
	 * the following is safe, since for compiler definitions of kvec and
	 * iovec are identical, yielding the same in-core layout and alignment
	 */
600
	msg->msg_iov = (struct iovec *)vec;
L
Linus Torvalds 已提交
601 602 603 604 605
	msg->msg_iovlen = num;
	result = sock_sendmsg(sock, msg, size);
	set_fs(oldfs);
	return result;
}
606
EXPORT_SYMBOL(kernel_sendmsg);
L
Linus Torvalds 已提交
607

608 609 610 611 612 613 614 615 616 617
static int ktime2ts(ktime_t kt, struct timespec *ts)
{
	if (kt.tv64) {
		*ts = ktime_to_timespec(kt);
		return 1;
	} else {
		return 0;
	}
}

618 619 620 621 622 623
/*
 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
 */
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
	struct sk_buff *skb)
{
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
	int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
	struct timespec ts[3];
	int empty = 1;
	struct skb_shared_hwtstamps *shhwtstamps =
		skb_hwtstamps(skb);

	/* Race occurred between timestamp enabling and packet
	   receiving.  Fill in the current time for now. */
	if (need_software_tstamp && skb->tstamp.tv64 == 0)
		__net_timestamp(skb);

	if (need_software_tstamp) {
		if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
			struct timeval tv;
			skb_get_timestamp(skb, &tv);
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
				 sizeof(tv), &tv);
		} else {
642
			skb_get_timestampns(skb, &ts[0]);
643
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
644
				 sizeof(ts[0]), &ts[0]);
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661
		}
	}


	memset(ts, 0, sizeof(ts));
	if (skb->tstamp.tv64 &&
	    sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
		skb_get_timestampns(skb, ts + 0);
		empty = 0;
	}
	if (shhwtstamps) {
		if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
		    ktime2ts(shhwtstamps->syststamp, ts + 1))
			empty = 0;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
		    ktime2ts(shhwtstamps->hwtstamp, ts + 2))
			empty = 0;
662
	}
663 664 665
	if (!empty)
		put_cmsg(msg, SOL_SOCKET,
			 SCM_TIMESTAMPING, sizeof(ts), &ts);
666
}
667 668
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);

S
stephen hemminger 已提交
669 670
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
				   struct sk_buff *skb)
671 672 673 674 675 676
{
	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
		put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
			sizeof(__u32), &skb->dropcount);
}

677
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
678 679 680 681 682
	struct sk_buff *skb)
{
	sock_recv_timestamp(msg, sk, skb);
	sock_recv_drops(msg, sk, skb);
}
683
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
684

685 686
static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
				       struct msghdr *msg, size_t size, int flags)
L
Linus Torvalds 已提交
687 688 689
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);

690 691
	sock_update_classid(sock->sk);

L
Linus Torvalds 已提交
692 693 694 695 696 697 698 699 700
	si->sock = sock;
	si->scm = NULL;
	si->msg = msg;
	si->size = size;
	si->flags = flags;

	return sock->ops->recvmsg(iocb, sock, msg, size, flags);
}

701 702 703 704 705 706 707 708
static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
				 struct msghdr *msg, size_t size, int flags)
{
	int err = security_socket_recvmsg(sock, msg, size, flags);

	return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
}

709
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
L
Linus Torvalds 已提交
710 711 712 713 714 715
		 size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

716
	init_sync_kiocb(&iocb, NULL);
L
Linus Torvalds 已提交
717 718 719 720 721 722
	iocb.private = &siocb;
	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
723
EXPORT_SYMBOL(sock_recvmsg);
L
Linus Torvalds 已提交
724

725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
			      size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

	init_sync_kiocb(&iocb, NULL);
	iocb.private = &siocb;
	ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}

740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
/**
 * kernel_recvmsg - Receive a message from a socket (kernel space)
 * @sock:       The socket to receive the message from
 * @msg:        Received message
 * @vec:        Input s/g array for message data
 * @num:        Size of input s/g array
 * @size:       Number of bytes to read
 * @flags:      Message flags (MSG_DONTWAIT, etc...)
 *
 * On return the msg structure contains the scatter/gather array passed in the
 * vec argument. The array is modified so that it consists of the unfilled
 * portion of the original array.
 *
 * The returned value is the total number of bytes received, or an error.
 */
755 756
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
		   struct kvec *vec, size_t num, size_t size, int flags)
L
Linus Torvalds 已提交
757 758 759 760 761 762 763 764 765
{
	mm_segment_t oldfs = get_fs();
	int result;

	set_fs(KERNEL_DS);
	/*
	 * the following is safe, since for compiler definitions of kvec and
	 * iovec are identical, yielding the same in-core layout and alignment
	 */
766
	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
L
Linus Torvalds 已提交
767 768 769 770
	result = sock_recvmsg(sock, msg, size, flags);
	set_fs(oldfs);
	return result;
}
771
EXPORT_SYMBOL(kernel_recvmsg);
L
Linus Torvalds 已提交
772 773 774 775 776 777

static void sock_aio_dtor(struct kiocb *iocb)
{
	kfree(iocb->private);
}

778 779
static ssize_t sock_sendpage(struct file *file, struct page *page,
			     int offset, size_t size, loff_t *ppos, int more)
L
Linus Torvalds 已提交
780 781 782 783
{
	struct socket *sock;
	int flags;

784 785 786 787 788 789
	sock = file->private_data;

	flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
	if (more)
		flags |= MSG_MORE;

790
	return kernel_sendpage(sock, page, offset, size, flags);
791
}
L
Linus Torvalds 已提交
792

J
Jens Axboe 已提交
793
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
794
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
795 796 797 798
				unsigned int flags)
{
	struct socket *sock = file->private_data;

799 800 801
	if (unlikely(!sock->ops->splice_read))
		return -EINVAL;

802 803
	sock_update_classid(sock->sk);

J
Jens Axboe 已提交
804 805 806
	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}

807
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
808
					 struct sock_iocb *siocb)
809 810 811 812 813
{
	if (!is_sync_kiocb(iocb)) {
		siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
		if (!siocb)
			return NULL;
L
Linus Torvalds 已提交
814 815 816
		iocb->ki_dtor = sock_aio_dtor;
	}

817 818 819
	siocb->kiocb = iocb;
	iocb->private = siocb;
	return siocb;
L
Linus Torvalds 已提交
820 821
}

822
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
823 824
		struct file *file, const struct iovec *iov,
		unsigned long nr_segs)
825 826 827 828
{
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
829

830 831
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
832

833 834 835 836
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
837
	msg->msg_iov = (struct iovec *)iov;
838 839 840 841 842 843
	msg->msg_iovlen = nr_segs;
	msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;

	return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
}

844 845
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
846 847 848
{
	struct sock_iocb siocb, *x;

L
Linus Torvalds 已提交
849 850
	if (pos != 0)
		return -ESPIPE;
851 852

	if (iocb->ki_left == 0)	/* Match SYS5 behaviour */
L
Linus Torvalds 已提交
853 854
		return 0;

855 856

	x = alloc_sock_iocb(iocb, &siocb);
857 858
	if (!x)
		return -ENOMEM;
859
	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
860 861
}

862
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
863 864
			struct file *file, const struct iovec *iov,
			unsigned long nr_segs)
L
Linus Torvalds 已提交
865
{
866 867 868
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
869

870 871
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
872

873 874 875 876
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
877
	msg->msg_iov = (struct iovec *)iov;
878 879 880 881
	msg->msg_iovlen = nr_segs;
	msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
	if (sock->type == SOCK_SEQPACKET)
		msg->msg_flags |= MSG_EOR;
L
Linus Torvalds 已提交
882

883
	return __sock_sendmsg(iocb, sock, msg, size);
L
Linus Torvalds 已提交
884 885
}

886 887
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos)
888 889
{
	struct sock_iocb siocb, *x;
L
Linus Torvalds 已提交
890

891 892
	if (pos != 0)
		return -ESPIPE;
893 894

	x = alloc_sock_iocb(iocb, &siocb);
895 896
	if (!x)
		return -ENOMEM;
L
Linus Torvalds 已提交
897

898
	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
899 900 901 902 903 904 905
}

/*
 * Atomic setting of ioctl hooks to avoid race
 * with module unload.
 */

A
Arjan van de Ven 已提交
906
static DEFINE_MUTEX(br_ioctl_mutex);
907
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
L
Linus Torvalds 已提交
908

909
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
L
Linus Torvalds 已提交
910
{
A
Arjan van de Ven 已提交
911
	mutex_lock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
912
	br_ioctl_hook = hook;
A
Arjan van de Ven 已提交
913
	mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
914 915 916
}
EXPORT_SYMBOL(brioctl_set);

A
Arjan van de Ven 已提交
917
static DEFINE_MUTEX(vlan_ioctl_mutex);
918
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
L
Linus Torvalds 已提交
919

920
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
L
Linus Torvalds 已提交
921
{
A
Arjan van de Ven 已提交
922
	mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
923
	vlan_ioctl_hook = hook;
A
Arjan van de Ven 已提交
924
	mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
925 926 927
}
EXPORT_SYMBOL(vlan_ioctl_set);

A
Arjan van de Ven 已提交
928
static DEFINE_MUTEX(dlci_ioctl_mutex);
929
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
L
Linus Torvalds 已提交
930

931
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
L
Linus Torvalds 已提交
932
{
A
Arjan van de Ven 已提交
933
	mutex_lock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
934
	dlci_ioctl_hook = hook;
A
Arjan van de Ven 已提交
935
	mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
936 937 938
}
EXPORT_SYMBOL(dlci_ioctl_set);

939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
static long sock_do_ioctl(struct net *net, struct socket *sock,
				 unsigned int cmd, unsigned long arg)
{
	int err;
	void __user *argp = (void __user *)arg;

	err = sock->ops->ioctl(sock, cmd, arg);

	/*
	 * If this ioctl is unknown try to hand it down
	 * to the NIC driver.
	 */
	if (err == -ENOIOCTLCMD)
		err = dev_ioctl(net, cmd, argp);

	return err;
}

L
Linus Torvalds 已提交
957 958 959 960 961 962 963 964
/*
 *	With an ioctl, arg may well be a user mode pointer, but we don't know
 *	what to do with it - that's up to the protocol still.
 */

static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
	struct socket *sock;
965
	struct sock *sk;
L
Linus Torvalds 已提交
966 967
	void __user *argp = (void __user *)arg;
	int pid, err;
968
	struct net *net;
L
Linus Torvalds 已提交
969

970
	sock = file->private_data;
971
	sk = sock->sk;
972
	net = sock_net(sk);
L
Linus Torvalds 已提交
973
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
974
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
975
	} else
J
Johannes Berg 已提交
976
#ifdef CONFIG_WEXT_CORE
L
Linus Torvalds 已提交
977
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
978
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
979
	} else
J
Johannes Berg 已提交
980
#endif
981
		switch (cmd) {
L
Linus Torvalds 已提交
982 983 984 985 986 987 988 989 990
		case FIOSETOWN:
		case SIOCSPGRP:
			err = -EFAULT;
			if (get_user(pid, (int __user *)argp))
				break;
			err = f_setown(sock->file, pid, 1);
			break;
		case FIOGETOWN:
		case SIOCGPGRP:
991
			err = put_user(f_getown(sock->file),
992
				       (int __user *)argp);
L
Linus Torvalds 已提交
993 994 995 996 997 998 999 1000 1001
			break;
		case SIOCGIFBR:
		case SIOCSIFBR:
		case SIOCBRADDBR:
		case SIOCBRDELBR:
			err = -ENOPKG;
			if (!br_ioctl_hook)
				request_module("bridge");

A
Arjan van de Ven 已提交
1002
			mutex_lock(&br_ioctl_mutex);
1003
			if (br_ioctl_hook)
1004
				err = br_ioctl_hook(net, cmd, argp);
A
Arjan van de Ven 已提交
1005
			mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1006 1007 1008 1009 1010 1011 1012
			break;
		case SIOCGIFVLAN:
		case SIOCSIFVLAN:
			err = -ENOPKG;
			if (!vlan_ioctl_hook)
				request_module("8021q");

A
Arjan van de Ven 已提交
1013
			mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1014
			if (vlan_ioctl_hook)
1015
				err = vlan_ioctl_hook(net, argp);
A
Arjan van de Ven 已提交
1016
			mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1017 1018 1019 1020 1021 1022 1023
			break;
		case SIOCADDDLCI:
		case SIOCDELDLCI:
			err = -ENOPKG;
			if (!dlci_ioctl_hook)
				request_module("dlci");

1024 1025
			mutex_lock(&dlci_ioctl_mutex);
			if (dlci_ioctl_hook)
L
Linus Torvalds 已提交
1026
				err = dlci_ioctl_hook(cmd, argp);
1027
			mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1028 1029
			break;
		default:
1030
			err = sock_do_ioctl(net, sock, cmd, arg);
L
Linus Torvalds 已提交
1031
			break;
1032
		}
L
Linus Torvalds 已提交
1033 1034 1035 1036 1037 1038 1039
	return err;
}

int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
	int err;
	struct socket *sock = NULL;
1040

L
Linus Torvalds 已提交
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	err = security_socket_create(family, type, protocol, 1);
	if (err)
		goto out;

	sock = sock_alloc();
	if (!sock) {
		err = -ENOMEM;
		goto out;
	}

	sock->type = type;
V
Venkat Yekkirala 已提交
1052 1053 1054 1055
	err = security_socket_post_create(sock, family, type, protocol, 1);
	if (err)
		goto out_release;

L
Linus Torvalds 已提交
1056 1057 1058
out:
	*res = sock;
	return err;
V
Venkat Yekkirala 已提交
1059 1060 1061 1062
out_release:
	sock_release(sock);
	sock = NULL;
	goto out;
L
Linus Torvalds 已提交
1063
}
1064
EXPORT_SYMBOL(sock_create_lite);
L
Linus Torvalds 已提交
1065 1066

/* No kernel lock held - perfect */
1067
static unsigned int sock_poll(struct file *file, poll_table *wait)
L
Linus Torvalds 已提交
1068 1069 1070 1071
{
	struct socket *sock;

	/*
1072
	 *      We can't return errors to poll, so it's either yes or no.
L
Linus Torvalds 已提交
1073
	 */
1074
	sock = file->private_data;
L
Linus Torvalds 已提交
1075 1076 1077
	return sock->ops->poll(file, sock, wait);
}

1078
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1079
{
1080
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
1081 1082 1083 1084

	return sock->ops->mmap(file, sock, vma);
}

1085
static int sock_close(struct inode *inode, struct file *filp)
L
Linus Torvalds 已提交
1086 1087
{
	/*
1088 1089
	 *      It was possible the inode is NULL we were
	 *      closing an unfinished socket.
L
Linus Torvalds 已提交
1090 1091
	 */

1092
	if (!inode) {
L
Linus Torvalds 已提交
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
		printk(KERN_DEBUG "sock_close: NULL inode\n");
		return 0;
	}
	sock_release(SOCKET_I(inode));
	return 0;
}

/*
 *	Update the socket async list
 *
 *	Fasync_list locking strategy.
 *
 *	1. fasync_list is modified only under process context socket lock
 *	   i.e. under semaphore.
 *	2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1108
 *	   or under socket lock
L
Linus Torvalds 已提交
1109 1110 1111 1112
 */

static int sock_fasync(int fd, struct file *filp, int on)
{
1113 1114
	struct socket *sock = filp->private_data;
	struct sock *sk = sock->sk;
1115
	struct socket_wq *wq;
L
Linus Torvalds 已提交
1116

1117
	if (sk == NULL)
L
Linus Torvalds 已提交
1118 1119 1120
		return -EINVAL;

	lock_sock(sk);
1121 1122
	wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
	fasync_helper(fd, filp, on, &wq->fasync_list);
L
Linus Torvalds 已提交
1123

1124
	if (!wq->fasync_list)
1125 1126
		sock_reset_flag(sk, SOCK_FASYNC);
	else
E
Eric Dumazet 已提交
1127
		sock_set_flag(sk, SOCK_FASYNC);
L
Linus Torvalds 已提交
1128

1129
	release_sock(sk);
L
Linus Torvalds 已提交
1130 1131 1132
	return 0;
}

1133
/* This function may be called only under socket lock or callback_lock or rcu_lock */
L
Linus Torvalds 已提交
1134 1135 1136

int sock_wake_async(struct socket *sock, int how, int band)
{
1137 1138 1139 1140 1141 1142 1143 1144
	struct socket_wq *wq;

	if (!sock)
		return -1;
	rcu_read_lock();
	wq = rcu_dereference(sock->wq);
	if (!wq || !wq->fasync_list) {
		rcu_read_unlock();
L
Linus Torvalds 已提交
1145
		return -1;
1146
	}
1147
	switch (how) {
1148
	case SOCK_WAKE_WAITD:
L
Linus Torvalds 已提交
1149 1150 1151
		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
			break;
		goto call_kill;
1152
	case SOCK_WAKE_SPACE:
L
Linus Torvalds 已提交
1153 1154 1155
		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
			break;
		/* fall through */
1156
	case SOCK_WAKE_IO:
1157
call_kill:
1158
		kill_fasync(&wq->fasync_list, SIGIO, band);
L
Linus Torvalds 已提交
1159
		break;
1160
	case SOCK_WAKE_URG:
1161
		kill_fasync(&wq->fasync_list, SIGURG, band);
L
Linus Torvalds 已提交
1162
	}
1163
	rcu_read_unlock();
L
Linus Torvalds 已提交
1164 1165
	return 0;
}
1166
EXPORT_SYMBOL(sock_wake_async);
L
Linus Torvalds 已提交
1167

P
Pavel Emelyanov 已提交
1168
int __sock_create(struct net *net, int family, int type, int protocol,
1169
			 struct socket **res, int kern)
L
Linus Torvalds 已提交
1170 1171 1172
{
	int err;
	struct socket *sock;
1173
	const struct net_proto_family *pf;
L
Linus Torvalds 已提交
1174 1175

	/*
1176
	 *      Check protocol is in range
L
Linus Torvalds 已提交
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	 */
	if (family < 0 || family >= NPROTO)
		return -EAFNOSUPPORT;
	if (type < 0 || type >= SOCK_MAX)
		return -EINVAL;

	/* Compatibility.

	   This uglymoron is moved from INET layer to here to avoid
	   deadlock in module load.
	 */
	if (family == PF_INET && type == SOCK_PACKET) {
1189
		static int warned;
L
Linus Torvalds 已提交
1190 1191
		if (!warned) {
			warned = 1;
1192 1193
			printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
			       current->comm);
L
Linus Torvalds 已提交
1194 1195 1196 1197 1198 1199 1200
		}
		family = PF_PACKET;
	}

	err = security_socket_create(family, type, protocol, kern);
	if (err)
		return err;
1201

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
	/*
	 *	Allocate the socket and allow the family to set things up. if
	 *	the protocol is 0, the family is instructed to select an appropriate
	 *	default.
	 */
	sock = sock_alloc();
	if (!sock) {
		if (net_ratelimit())
			printk(KERN_WARNING "socket: no more sockets\n");
		return -ENFILE;	/* Not exactly a match, but its the
				   closest posix thing */
	}

	sock->type = type;

1217
#ifdef CONFIG_MODULES
1218 1219 1220
	/* Attempt to load a protocol module if the find failed.
	 *
	 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
L
Linus Torvalds 已提交
1221 1222 1223
	 * requested real, full-featured networking support upon configuration.
	 * Otherwise module support will break!
	 */
E
Eric Dumazet 已提交
1224
	if (rcu_access_pointer(net_families[family]) == NULL)
1225
		request_module("net-pf-%d", family);
L
Linus Torvalds 已提交
1226 1227
#endif

1228 1229 1230 1231 1232
	rcu_read_lock();
	pf = rcu_dereference(net_families[family]);
	err = -EAFNOSUPPORT;
	if (!pf)
		goto out_release;
L
Linus Torvalds 已提交
1233 1234 1235 1236 1237

	/*
	 * We will call the ->create function, that possibly is in a loadable
	 * module, so we have to bump that loadable module refcnt first.
	 */
1238
	if (!try_module_get(pf->owner))
L
Linus Torvalds 已提交
1239 1240
		goto out_release;

1241 1242 1243
	/* Now protected by module ref count */
	rcu_read_unlock();

1244
	err = pf->create(net, sock, protocol, kern);
1245
	if (err < 0)
L
Linus Torvalds 已提交
1246
		goto out_module_put;
1247

L
Linus Torvalds 已提交
1248 1249 1250 1251
	/*
	 * Now to bump the refcnt of the [loadable] module that owns this
	 * socket at sock_release time we decrement its refcnt.
	 */
1252 1253 1254
	if (!try_module_get(sock->ops->owner))
		goto out_module_busy;

L
Linus Torvalds 已提交
1255 1256 1257 1258
	/*
	 * Now that we're done with the ->create function, the [loadable]
	 * module can have its refcnt decremented
	 */
1259
	module_put(pf->owner);
V
Venkat Yekkirala 已提交
1260 1261
	err = security_socket_post_create(sock, family, type, protocol, kern);
	if (err)
1262
		goto out_sock_release;
1263
	*res = sock;
L
Linus Torvalds 已提交
1264

1265 1266 1267 1268
	return 0;

out_module_busy:
	err = -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1269
out_module_put:
1270 1271 1272
	sock->ops = NULL;
	module_put(pf->owner);
out_sock_release:
L
Linus Torvalds 已提交
1273
	sock_release(sock);
1274 1275 1276 1277 1278
	return err;

out_release:
	rcu_read_unlock();
	goto out_sock_release;
L
Linus Torvalds 已提交
1279
}
P
Pavel Emelyanov 已提交
1280
EXPORT_SYMBOL(__sock_create);
L
Linus Torvalds 已提交
1281 1282 1283

int sock_create(int family, int type, int protocol, struct socket **res)
{
1284
	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
L
Linus Torvalds 已提交
1285
}
1286
EXPORT_SYMBOL(sock_create);
L
Linus Torvalds 已提交
1287 1288 1289

int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
1290
	return __sock_create(&init_net, family, type, protocol, res, 1);
L
Linus Torvalds 已提交
1291
}
1292
EXPORT_SYMBOL(sock_create_kern);
L
Linus Torvalds 已提交
1293

1294
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
L
Linus Torvalds 已提交
1295 1296 1297
{
	int retval;
	struct socket *sock;
1298 1299
	int flags;

1300 1301 1302 1303 1304 1305
	/* Check the SOCK_* constants for consistency.  */
	BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
	BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
	BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);

1306
	flags = type & ~SOCK_TYPE_MASK;
1307
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1308 1309
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1310

U
Ulrich Drepper 已提交
1311 1312 1313
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1314 1315 1316 1317
	retval = sock_create(family, type, protocol, &sock);
	if (retval < 0)
		goto out;

1318
	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
L
Linus Torvalds 已提交
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
	if (retval < 0)
		goto out_release;

out:
	/* It may be already another descriptor 8) Not kernel problem. */
	return retval;

out_release:
	sock_release(sock);
	return retval;
}

/*
 *	Create a pair of connected sockets.
 */

1335 1336
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
		int __user *, usockvec)
L
Linus Torvalds 已提交
1337 1338 1339
{
	struct socket *sock1, *sock2;
	int fd1, fd2, err;
A
Al Viro 已提交
1340
	struct file *newfile1, *newfile2;
1341 1342 1343
	int flags;

	flags = type & ~SOCK_TYPE_MASK;
1344
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1345 1346
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1347

U
Ulrich Drepper 已提交
1348 1349 1350
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
	/*
	 * Obtain the first socket and check if the underlying protocol
	 * supports the socketpair call.
	 */

	err = sock_create(family, type, protocol, &sock1);
	if (err < 0)
		goto out;

	err = sock_create(family, type, protocol, &sock2);
	if (err < 0)
		goto out_release_1;

	err = sock1->ops->socketpair(sock1, sock2);
1365
	if (err < 0)
L
Linus Torvalds 已提交
1366 1367
		goto out_release_both;

1368
	fd1 = sock_alloc_file(sock1, &newfile1, flags);
1369 1370
	if (unlikely(fd1 < 0)) {
		err = fd1;
A
Al Viro 已提交
1371
		goto out_release_both;
1372
	}
L
Linus Torvalds 已提交
1373

1374
	fd2 = sock_alloc_file(sock2, &newfile2, flags);
1375 1376 1377 1378 1379 1380
	if (unlikely(fd2 < 0)) {
		err = fd2;
		fput(newfile1);
		put_unused_fd(fd1);
		sock_release(sock2);
		goto out;
A
Al Viro 已提交
1381 1382
	}

A
Al Viro 已提交
1383
	audit_fd_pair(fd1, fd2);
A
Al Viro 已提交
1384 1385
	fd_install(fd1, newfile1);
	fd_install(fd2, newfile2);
L
Linus Torvalds 已提交
1386 1387 1388 1389
	/* fd1 and fd2 may be already another descriptors.
	 * Not kernel problem.
	 */

1390
	err = put_user(fd1, &usockvec[0]);
L
Linus Torvalds 已提交
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
	if (!err)
		err = put_user(fd2, &usockvec[1]);
	if (!err)
		return 0;

	sys_close(fd2);
	sys_close(fd1);
	return err;

out_release_both:
1401
	sock_release(sock2);
L
Linus Torvalds 已提交
1402
out_release_1:
1403
	sock_release(sock1);
L
Linus Torvalds 已提交
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
out:
	return err;
}

/*
 *	Bind a name to a socket. Nothing much to do here since it's
 *	the protocol's responsibility to handle the local address.
 *
 *	We move the socket address to kernel space before we call
 *	the protocol layer (having also checked the address is ok).
 */

1416
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
L
Linus Torvalds 已提交
1417 1418
{
	struct socket *sock;
1419
	struct sockaddr_storage address;
1420
	int err, fput_needed;
L
Linus Torvalds 已提交
1421

1422
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1423
	if (sock) {
1424
		err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
1425 1426
		if (err >= 0) {
			err = security_socket_bind(sock,
1427
						   (struct sockaddr *)&address,
1428
						   addrlen);
1429 1430
			if (!err)
				err = sock->ops->bind(sock,
1431
						      (struct sockaddr *)
1432
						      &address, addrlen);
L
Linus Torvalds 已提交
1433
		}
1434
		fput_light(sock->file, fput_needed);
1435
	}
L
Linus Torvalds 已提交
1436 1437 1438 1439 1440 1441 1442 1443 1444
	return err;
}

/*
 *	Perform a listen. Basically, we allow the protocol to do anything
 *	necessary for a listen, and if that works, we mark the socket as
 *	ready for listening.
 */

1445
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
L
Linus Torvalds 已提交
1446 1447
{
	struct socket *sock;
1448
	int err, fput_needed;
1449
	int somaxconn;
1450 1451 1452

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
1453
		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1454 1455
		if ((unsigned)backlog > somaxconn)
			backlog = somaxconn;
L
Linus Torvalds 已提交
1456 1457

		err = security_socket_listen(sock, backlog);
1458 1459
		if (!err)
			err = sock->ops->listen(sock, backlog);
L
Linus Torvalds 已提交
1460

1461
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
	}
	return err;
}

/*
 *	For accept, we attempt to create a new socket, set up the link
 *	with the client, wake up the client, then return the new
 *	connected fd. We collect the address of the connector in kernel
 *	space and move it to user at the very end. This is unclean because
 *	we open the socket then return an error.
 *
 *	1003.1g adds the ability to recvmsg() to query connection pending
 *	status to recvmsg. We need to add that support in a way thats
 *	clean when we restucture accept also.
 */

1478 1479
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen, int, flags)
L
Linus Torvalds 已提交
1480 1481
{
	struct socket *sock, *newsock;
1482
	struct file *newfile;
1483
	int err, len, newfd, fput_needed;
1484
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1485

1486
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
U
Ulrich Drepper 已提交
1487 1488 1489 1490 1491
		return -EINVAL;

	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

1492
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1493 1494 1495 1496
	if (!sock)
		goto out;

	err = -ENFILE;
1497 1498
	newsock = sock_alloc();
	if (!newsock)
L
Linus Torvalds 已提交
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
		goto out_put;

	newsock->type = sock->type;
	newsock->ops = sock->ops;

	/*
	 * We don't need try_module_get here, as the listening socket (sock)
	 * has the protocol module (sock->ops->owner) held.
	 */
	__module_get(newsock->ops->owner);

1510
	newfd = sock_alloc_file(newsock, &newfile, flags);
1511 1512
	if (unlikely(newfd < 0)) {
		err = newfd;
1513 1514
		sock_release(newsock);
		goto out_put;
1515 1516
	}

1517 1518
	err = security_socket_accept(sock, newsock);
	if (err)
1519
		goto out_fd;
1520

L
Linus Torvalds 已提交
1521 1522
	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
	if (err < 0)
1523
		goto out_fd;
L
Linus Torvalds 已提交
1524 1525

	if (upeer_sockaddr) {
1526
		if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1527
					  &len, 2) < 0) {
L
Linus Torvalds 已提交
1528
			err = -ECONNABORTED;
1529
			goto out_fd;
L
Linus Torvalds 已提交
1530
		}
1531 1532
		err = move_addr_to_user((struct sockaddr *)&address,
					len, upeer_sockaddr, upeer_addrlen);
L
Linus Torvalds 已提交
1533
		if (err < 0)
1534
			goto out_fd;
L
Linus Torvalds 已提交
1535 1536 1537 1538
	}

	/* File flags are not inherited via accept() unlike another OSes. */

1539 1540
	fd_install(newfd, newfile);
	err = newfd;
L
Linus Torvalds 已提交
1541 1542

out_put:
1543
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1544 1545
out:
	return err;
1546
out_fd:
1547
	fput(newfile);
1548
	put_unused_fd(newfd);
L
Linus Torvalds 已提交
1549 1550 1551
	goto out_put;
}

1552 1553
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen)
U
Ulrich Drepper 已提交
1554
{
U
Ulrich Drepper 已提交
1555
	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
U
Ulrich Drepper 已提交
1556 1557
}

L
Linus Torvalds 已提交
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
/*
 *	Attempt to connect to a socket with the server address.  The address
 *	is in user space so we verify it is OK and move it to kernel space.
 *
 *	For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
 *	break bindings
 *
 *	NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
 *	other SEQPACKET protocols that take time to connect() as it doesn't
 *	include the -EINPROGRESS status for such sockets.
 */

1570 1571
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
		int, addrlen)
L
Linus Torvalds 已提交
1572 1573
{
	struct socket *sock;
1574
	struct sockaddr_storage address;
1575
	int err, fput_needed;
L
Linus Torvalds 已提交
1576

1577
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1578 1579
	if (!sock)
		goto out;
1580
	err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
L
Linus Torvalds 已提交
1581 1582 1583
	if (err < 0)
		goto out_put;

1584
	err =
1585
	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
L
Linus Torvalds 已提交
1586 1587 1588
	if (err)
		goto out_put;

1589
	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
L
Linus Torvalds 已提交
1590 1591
				 sock->file->f_flags);
out_put:
1592
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1593 1594 1595 1596 1597 1598 1599 1600 1601
out:
	return err;
}

/*
 *	Get the local address ('name') of a socket object. Move the obtained
 *	name to user space.
 */

1602 1603
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1604 1605
{
	struct socket *sock;
1606
	struct sockaddr_storage address;
1607
	int len, err, fput_needed;
1608

1609
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1610 1611 1612 1613 1614 1615 1616
	if (!sock)
		goto out;

	err = security_socket_getsockname(sock);
	if (err)
		goto out_put;

1617
	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
L
Linus Torvalds 已提交
1618 1619
	if (err)
		goto out_put;
1620
	err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
L
Linus Torvalds 已提交
1621 1622

out_put:
1623
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1624 1625 1626 1627 1628 1629 1630 1631 1632
out:
	return err;
}

/*
 *	Get the remote address ('name') of a socket object. Move the obtained
 *	name to user space.
 */

1633 1634
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1635 1636
{
	struct socket *sock;
1637
	struct sockaddr_storage address;
1638
	int len, err, fput_needed;
L
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1639

1640 1641
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
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1642 1643
		err = security_socket_getpeername(sock);
		if (err) {
1644
			fput_light(sock->file, fput_needed);
L
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1645 1646 1647
			return err;
		}

1648
		err =
1649
		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1650
				       1);
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1651
		if (!err)
1652
			err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
1653
						usockaddr_len);
1654
		fput_light(sock->file, fput_needed);
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1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
	}
	return err;
}

/*
 *	Send a datagram to a given address. We move the address into kernel
 *	space and check the user space data area is readable before invoking
 *	the protocol.
 */

1665 1666 1667
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
		unsigned, flags, struct sockaddr __user *, addr,
		int, addr_len)
L
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1668 1669
{
	struct socket *sock;
1670
	struct sockaddr_storage address;
L
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1671 1672 1673
	int err;
	struct msghdr msg;
	struct iovec iov;
1674 1675
	int fput_needed;

1676 1677
	if (len > INT_MAX)
		len = INT_MAX;
1678 1679
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
1680
		goto out;
1681

1682 1683 1684 1685 1686 1687 1688 1689
	iov.iov_base = buff;
	iov.iov_len = len;
	msg.msg_name = NULL;
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_namelen = 0;
1690
	if (addr) {
1691
		err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
L
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1692 1693
		if (err < 0)
			goto out_put;
1694
		msg.msg_name = (struct sockaddr *)&address;
1695
		msg.msg_namelen = addr_len;
L
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1696 1697 1698 1699 1700 1701
	}
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
	msg.msg_flags = flags;
	err = sock_sendmsg(sock, &msg, len);

1702
out_put:
1703
	fput_light(sock->file, fput_needed);
1704
out:
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1705 1706 1707 1708
	return err;
}

/*
1709
 *	Send a datagram down a socket.
L
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1710 1711
 */

1712 1713
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
		unsigned, flags)
L
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1714 1715 1716 1717 1718
{
	return sys_sendto(fd, buff, len, flags, NULL, 0);
}

/*
1719
 *	Receive a frame from the socket and optionally record the address of the
L
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1720 1721 1722 1723
 *	sender. We verify the buffers are writable and if needed move the
 *	sender address from kernel to user space.
 */

1724 1725 1726
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
		unsigned, flags, struct sockaddr __user *, addr,
		int __user *, addr_len)
L
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1727 1728 1729 1730
{
	struct socket *sock;
	struct iovec iov;
	struct msghdr msg;
1731
	struct sockaddr_storage address;
1732
	int err, err2;
1733 1734
	int fput_needed;

1735 1736
	if (size > INT_MAX)
		size = INT_MAX;
1737
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
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1738
	if (!sock)
1739
		goto out;
L
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1740

1741 1742 1743 1744 1745 1746
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_iovlen = 1;
	msg.msg_iov = &iov;
	iov.iov_len = size;
	iov.iov_base = ubuf;
1747 1748
	msg.msg_name = (struct sockaddr *)&address;
	msg.msg_namelen = sizeof(address);
L
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1749 1750
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
1751
	err = sock_recvmsg(sock, &msg, size, flags);
L
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1752

1753
	if (err >= 0 && addr != NULL) {
1754 1755
		err2 = move_addr_to_user((struct sockaddr *)&address,
					 msg.msg_namelen, addr, addr_len);
1756 1757
		if (err2 < 0)
			err = err2;
L
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1758
	}
1759 1760

	fput_light(sock->file, fput_needed);
1761
out:
L
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1762 1763 1764 1765
	return err;
}

/*
1766
 *	Receive a datagram from a socket.
L
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1767 1768
 */

1769 1770
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
			 unsigned flags)
L
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1771 1772 1773 1774 1775 1776 1777 1778 1779
{
	return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
}

/*
 *	Set a socket option. Because we don't know the option lengths we have
 *	to pass the user mode parameter for the protocols to sort out.
 */

1780 1781
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int, optlen)
L
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1782
{
1783
	int err, fput_needed;
L
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1784 1785 1786 1787
	struct socket *sock;

	if (optlen < 0)
		return -EINVAL;
1788 1789 1790 1791

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
		err = security_socket_setsockopt(sock, level, optname);
1792 1793
		if (err)
			goto out_put;
L
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1794 1795

		if (level == SOL_SOCKET)
1796 1797 1798
			err =
			    sock_setsockopt(sock, level, optname, optval,
					    optlen);
L
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1799
		else
1800 1801 1802
			err =
			    sock->ops->setsockopt(sock, level, optname, optval,
						  optlen);
1803 1804
out_put:
		fput_light(sock->file, fput_needed);
L
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1805 1806 1807 1808 1809 1810 1811 1812 1813
	}
	return err;
}

/*
 *	Get a socket option. Because we don't know the option lengths we have
 *	to pass a user mode parameter for the protocols to sort out.
 */

1814 1815
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int __user *, optlen)
L
Linus Torvalds 已提交
1816
{
1817
	int err, fput_needed;
L
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1818 1819
	struct socket *sock;

1820 1821
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
1822 1823 1824
		err = security_socket_getsockopt(sock, level, optname);
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1825 1826

		if (level == SOL_SOCKET)
1827 1828 1829
			err =
			    sock_getsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1830
		else
1831 1832 1833
			err =
			    sock->ops->getsockopt(sock, level, optname, optval,
						  optlen);
1834 1835
out_put:
		fput_light(sock->file, fput_needed);
L
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1836 1837 1838 1839 1840 1841 1842 1843
	}
	return err;
}

/*
 *	Shutdown a socket.
 */

1844
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
L
Linus Torvalds 已提交
1845
{
1846
	int err, fput_needed;
L
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1847 1848
	struct socket *sock;

1849 1850
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1851
		err = security_socket_shutdown(sock, how);
1852 1853 1854
		if (!err)
			err = sock->ops->shutdown(sock, how);
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1855 1856 1857 1858
	}
	return err;
}

1859
/* A couple of helpful macros for getting the address of the 32/64 bit
L
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1860 1861 1862 1863 1864 1865 1866 1867 1868 1869
 * fields which are the same type (int / unsigned) on our platforms.
 */
#define COMPAT_MSG(msg, member)	((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
#define COMPAT_NAMELEN(msg)	COMPAT_MSG(msg, msg_namelen)
#define COMPAT_FLAGS(msg)	COMPAT_MSG(msg, msg_flags)

/*
 *	BSD sendmsg interface
 */

1870
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
L
Linus Torvalds 已提交
1871
{
1872 1873
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
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1874
	struct socket *sock;
1875
	struct sockaddr_storage address;
L
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1876
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1877
	unsigned char ctl[sizeof(struct cmsghdr) + 20]
1878 1879
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));
	/* 20 is size of ipv6_pktinfo */
L
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1880 1881 1882
	unsigned char *ctl_buf = ctl;
	struct msghdr msg_sys;
	int err, ctl_len, iov_size, total_len;
1883
	int fput_needed;
1884

L
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1885 1886 1887 1888
	err = -EFAULT;
	if (MSG_CMSG_COMPAT & flags) {
		if (get_compat_msghdr(&msg_sys, msg_compat))
			return -EFAULT;
1889
	} else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
L
Linus Torvalds 已提交
1890 1891
		return -EFAULT;

1892
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1893
	if (!sock)
L
Linus Torvalds 已提交
1894 1895 1896 1897 1898 1899 1900
		goto out;

	/* do not move before msg_sys is valid */
	err = -EMSGSIZE;
	if (msg_sys.msg_iovlen > UIO_MAXIOV)
		goto out_put;

1901
	/* Check whether to allocate the iovec area */
L
Linus Torvalds 已提交
1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	err = -ENOMEM;
	iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
	if (msg_sys.msg_iovlen > UIO_FASTIOV) {
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
			goto out_put;
	}

	/* This will also move the address data into kernel space */
	if (MSG_CMSG_COMPAT & flags) {
1912 1913 1914
		err = verify_compat_iovec(&msg_sys, iov,
					  (struct sockaddr *)&address,
					  VERIFY_READ);
L
Linus Torvalds 已提交
1915
	} else
1916 1917 1918
		err = verify_iovec(&msg_sys, iov,
				   (struct sockaddr *)&address,
				   VERIFY_READ);
1919
	if (err < 0)
L
Linus Torvalds 已提交
1920 1921 1922 1923 1924 1925 1926
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

	if (msg_sys.msg_controllen > INT_MAX)
		goto out_freeiov;
1927
	ctl_len = msg_sys.msg_controllen;
L
Linus Torvalds 已提交
1928
	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1929 1930 1931
		err =
		    cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
						     sizeof(ctl));
L
Linus Torvalds 已提交
1932 1933 1934
		if (err)
			goto out_freeiov;
		ctl_buf = msg_sys.msg_control;
A
Al Viro 已提交
1935
		ctl_len = msg_sys.msg_controllen;
L
Linus Torvalds 已提交
1936
	} else if (ctl_len) {
1937
		if (ctl_len > sizeof(ctl)) {
L
Linus Torvalds 已提交
1938
			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1939
			if (ctl_buf == NULL)
L
Linus Torvalds 已提交
1940 1941 1942 1943 1944 1945 1946 1947
				goto out_freeiov;
		}
		err = -EFAULT;
		/*
		 * Careful! Before this, msg_sys.msg_control contains a user pointer.
		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
		 * checking falls down on this.
		 */
1948 1949
		if (copy_from_user(ctl_buf,
				   (void __user __force *)msg_sys.msg_control,
1950
				   ctl_len))
L
Linus Torvalds 已提交
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
			goto out_freectl;
		msg_sys.msg_control = ctl_buf;
	}
	msg_sys.msg_flags = flags;

	if (sock->file->f_flags & O_NONBLOCK)
		msg_sys.msg_flags |= MSG_DONTWAIT;
	err = sock_sendmsg(sock, &msg_sys, total_len);

out_freectl:
1961
	if (ctl_buf != ctl)
L
Linus Torvalds 已提交
1962 1963 1964 1965 1966
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
out_put:
1967
	fput_light(sock->file, fput_needed);
1968
out:
L
Linus Torvalds 已提交
1969 1970 1971
	return err;
}

1972 1973
static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
			 struct msghdr *msg_sys, unsigned flags, int nosec)
L
Linus Torvalds 已提交
1974
{
1975 1976
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
Linus Torvalds 已提交
1977
	struct iovec iovstack[UIO_FASTIOV];
1978
	struct iovec *iov = iovstack;
L
Linus Torvalds 已提交
1979 1980 1981 1982
	unsigned long cmsg_ptr;
	int err, iov_size, total_len, len;

	/* kernel mode address */
1983
	struct sockaddr_storage addr;
L
Linus Torvalds 已提交
1984 1985 1986 1987

	/* user mode address pointers */
	struct sockaddr __user *uaddr;
	int __user *uaddr_len;
1988

L
Linus Torvalds 已提交
1989
	if (MSG_CMSG_COMPAT & flags) {
1990
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
1991
			return -EFAULT;
1992
	} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
1993
		return -EFAULT;
L
Linus Torvalds 已提交
1994 1995

	err = -EMSGSIZE;
1996 1997
	if (msg_sys->msg_iovlen > UIO_MAXIOV)
		goto out;
1998 1999

	/* Check whether to allocate the iovec area */
L
Linus Torvalds 已提交
2000
	err = -ENOMEM;
2001 2002
	iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
L
Linus Torvalds 已提交
2003 2004
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
2005
			goto out;
L
Linus Torvalds 已提交
2006 2007 2008
	}

	/*
2009 2010
	 *      Save the user-mode address (verify_iovec will change the
	 *      kernel msghdr to use the kernel address space)
L
Linus Torvalds 已提交
2011
	 */
2012

2013
	uaddr = (__force void __user *)msg_sys->msg_name;
L
Linus Torvalds 已提交
2014 2015
	uaddr_len = COMPAT_NAMELEN(msg);
	if (MSG_CMSG_COMPAT & flags) {
2016
		err = verify_compat_iovec(msg_sys, iov,
2017 2018
					  (struct sockaddr *)&addr,
					  VERIFY_WRITE);
L
Linus Torvalds 已提交
2019
	} else
2020
		err = verify_iovec(msg_sys, iov,
2021 2022
				   (struct sockaddr *)&addr,
				   VERIFY_WRITE);
L
Linus Torvalds 已提交
2023 2024
	if (err < 0)
		goto out_freeiov;
2025
	total_len = err;
L
Linus Torvalds 已提交
2026

2027 2028
	cmsg_ptr = (unsigned long)msg_sys->msg_control;
	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2029

L
Linus Torvalds 已提交
2030 2031
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
2032 2033
	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
							  total_len, flags);
L
Linus Torvalds 已提交
2034 2035 2036 2037 2038
	if (err < 0)
		goto out_freeiov;
	len = err;

	if (uaddr != NULL) {
2039
		err = move_addr_to_user((struct sockaddr *)&addr,
2040
					msg_sys->msg_namelen, uaddr,
2041
					uaddr_len);
L
Linus Torvalds 已提交
2042 2043 2044
		if (err < 0)
			goto out_freeiov;
	}
2045
	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2046
			 COMPAT_FLAGS(msg));
L
Linus Torvalds 已提交
2047 2048 2049
	if (err)
		goto out_freeiov;
	if (MSG_CMSG_COMPAT & flags)
2050
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2051 2052
				 &msg_compat->msg_controllen);
	else
2053
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2054 2055 2056 2057 2058 2059 2060 2061
				 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081
out:
	return err;
}

/*
 *	BSD recvmsg interface
 */

SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
		unsigned int, flags)
{
	int fput_needed, err;
	struct msghdr msg_sys;
	struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);

	if (!sock)
		goto out;

	err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);

2082
	fput_light(sock->file, fput_needed);
L
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2083 2084 2085 2086
out:
	return err;
}

2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
/*
 *     Linux recvmmsg interface
 */

int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
		   unsigned int flags, struct timespec *timeout)
{
	int fput_needed, err, datagrams;
	struct socket *sock;
	struct mmsghdr __user *entry;
2097
	struct compat_mmsghdr __user *compat_entry;
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116
	struct msghdr msg_sys;
	struct timespec end_time;

	if (timeout &&
	    poll_select_set_timeout(&end_time, timeout->tv_sec,
				    timeout->tv_nsec))
		return -EINVAL;

	datagrams = 0;

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
		return err;

	err = sock_error(sock->sk);
	if (err)
		goto out_put;

	entry = mmsg;
2117
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2118 2119 2120 2121 2122

	while (datagrams < vlen) {
		/*
		 * No need to ask LSM for more than the first datagram.
		 */
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138
		if (MSG_CMSG_COMPAT & flags) {
			err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
					    &msg_sys, flags, datagrams);
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
			err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
					    &msg_sys, flags, datagrams);
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

2139 2140 2141 2142
		if (err)
			break;
		++datagrams;

2143 2144 2145 2146
		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
		if (flags & MSG_WAITFORONE)
			flags |= MSG_DONTWAIT;

2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
		if (timeout) {
			ktime_get_ts(timeout);
			*timeout = timespec_sub(end_time, *timeout);
			if (timeout->tv_sec < 0) {
				timeout->tv_sec = timeout->tv_nsec = 0;
				break;
			}

			/* Timeout, return less than vlen datagrams */
			if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
				break;
		}

		/* Out of band data, return right away */
		if (msg_sys.msg_flags & MSG_OOB)
			break;
	}

out_put:
	fput_light(sock->file, fput_needed);
L
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2167

2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
	if (err == 0)
		return datagrams;

	if (datagrams != 0) {
		/*
		 * We may return less entries than requested (vlen) if the
		 * sock is non block and there aren't enough datagrams...
		 */
		if (err != -EAGAIN) {
			/*
			 * ... or  if recvmsg returns an error after we
			 * received some datagrams, where we record the
			 * error to return on the next call or if the
			 * app asks about it using getsockopt(SO_ERROR).
			 */
			sock->sk->sk_err = -err;
		}

		return datagrams;
	}

	return err;
}

SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
		unsigned int, vlen, unsigned int, flags,
		struct timespec __user *, timeout)
{
	int datagrams;
	struct timespec timeout_sys;

	if (!timeout)
		return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);

	if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
		return -EFAULT;

	datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);

	if (datagrams > 0 &&
	    copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
		datagrams = -EFAULT;

	return datagrams;
}

#ifdef __ARCH_WANT_SYS_SOCKETCALL
L
Linus Torvalds 已提交
2215 2216
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
2217
static const unsigned char nargs[20] = {
2218 2219 2220 2221
	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
	AL(4), AL(5)
2222 2223
};

L
Linus Torvalds 已提交
2224 2225 2226
#undef AL

/*
2227
 *	System call vectors.
L
Linus Torvalds 已提交
2228 2229 2230
 *
 *	Argument checking cleaned up. Saved 20% in size.
 *  This function doesn't need to set the kernel lock because
2231
 *  it is set by the callees.
L
Linus Torvalds 已提交
2232 2233
 */

2234
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
L
Linus Torvalds 已提交
2235 2236
{
	unsigned long a[6];
2237
	unsigned long a0, a1;
L
Linus Torvalds 已提交
2238
	int err;
2239
	unsigned int len;
L
Linus Torvalds 已提交
2240

2241
	if (call < 1 || call > SYS_RECVMMSG)
L
Linus Torvalds 已提交
2242 2243
		return -EINVAL;

2244 2245 2246 2247
	len = nargs[call];
	if (len > sizeof(a))
		return -EINVAL;

L
Linus Torvalds 已提交
2248
	/* copy_from_user should be SMP safe. */
2249
	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
2250
		return -EFAULT;
2251

A
Al Viro 已提交
2252
	audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2253

2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
	a0 = a[0];
	a1 = a[1];

	switch (call) {
	case SYS_SOCKET:
		err = sys_socket(a0, a1, a[2]);
		break;
	case SYS_BIND:
		err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
		break;
	case SYS_CONNECT:
		err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
		break;
	case SYS_LISTEN:
		err = sys_listen(a0, a1);
		break;
	case SYS_ACCEPT:
U
Ulrich Drepper 已提交
2271 2272
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], 0);
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318
		break;
	case SYS_GETSOCKNAME:
		err =
		    sys_getsockname(a0, (struct sockaddr __user *)a1,
				    (int __user *)a[2]);
		break;
	case SYS_GETPEERNAME:
		err =
		    sys_getpeername(a0, (struct sockaddr __user *)a1,
				    (int __user *)a[2]);
		break;
	case SYS_SOCKETPAIR:
		err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
		break;
	case SYS_SEND:
		err = sys_send(a0, (void __user *)a1, a[2], a[3]);
		break;
	case SYS_SENDTO:
		err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
				 (struct sockaddr __user *)a[4], a[5]);
		break;
	case SYS_RECV:
		err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
		break;
	case SYS_RECVFROM:
		err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
				   (struct sockaddr __user *)a[4],
				   (int __user *)a[5]);
		break;
	case SYS_SHUTDOWN:
		err = sys_shutdown(a0, a1);
		break;
	case SYS_SETSOCKOPT:
		err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
		break;
	case SYS_GETSOCKOPT:
		err =
		    sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
				   (int __user *)a[4]);
		break;
	case SYS_SENDMSG:
		err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
	case SYS_RECVMSG:
		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
2319 2320 2321 2322
	case SYS_RECVMMSG:
		err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
				   (struct timespec __user *)a[4]);
		break;
U
Ulrich Drepper 已提交
2323 2324 2325
	case SYS_ACCEPT4:
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], a[3]);
U
Ulrich Drepper 已提交
2326
		break;
2327 2328 2329
	default:
		err = -EINVAL;
		break;
L
Linus Torvalds 已提交
2330 2331 2332 2333
	}
	return err;
}

2334
#endif				/* __ARCH_WANT_SYS_SOCKETCALL */
L
Linus Torvalds 已提交
2335

2336 2337 2338 2339
/**
 *	sock_register - add a socket protocol handler
 *	@ops: description of protocol
 *
L
Linus Torvalds 已提交
2340 2341
 *	This function is called by a protocol handler that wants to
 *	advertise its address family, and have it linked into the
2342 2343
 *	socket interface. The value ops->family coresponds to the
 *	socket system call protocol family.
L
Linus Torvalds 已提交
2344
 */
2345
int sock_register(const struct net_proto_family *ops)
L
Linus Torvalds 已提交
2346 2347 2348 2349
{
	int err;

	if (ops->family >= NPROTO) {
2350 2351
		printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
		       NPROTO);
L
Linus Torvalds 已提交
2352 2353
		return -ENOBUFS;
	}
2354 2355

	spin_lock(&net_family_lock);
E
Eric Dumazet 已提交
2356 2357
	if (rcu_dereference_protected(net_families[ops->family],
				      lockdep_is_held(&net_family_lock)))
2358 2359
		err = -EEXIST;
	else {
E
Eric Dumazet 已提交
2360
		rcu_assign_pointer(net_families[ops->family], ops);
L
Linus Torvalds 已提交
2361 2362
		err = 0;
	}
2363 2364
	spin_unlock(&net_family_lock);

2365
	printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
L
Linus Torvalds 已提交
2366 2367
	return err;
}
2368
EXPORT_SYMBOL(sock_register);
L
Linus Torvalds 已提交
2369

2370 2371 2372 2373
/**
 *	sock_unregister - remove a protocol handler
 *	@family: protocol family to remove
 *
L
Linus Torvalds 已提交
2374 2375
 *	This function is called by a protocol handler that wants to
 *	remove its address family, and have it unlinked from the
2376 2377 2378 2379 2380 2381
 *	new socket creation.
 *
 *	If protocol handler is a module, then it can use module reference
 *	counts to protect against new references. If protocol handler is not
 *	a module then it needs to provide its own protection in
 *	the ops->create routine.
L
Linus Torvalds 已提交
2382
 */
2383
void sock_unregister(int family)
L
Linus Torvalds 已提交
2384
{
2385
	BUG_ON(family < 0 || family >= NPROTO);
L
Linus Torvalds 已提交
2386

2387
	spin_lock(&net_family_lock);
E
Eric Dumazet 已提交
2388
	rcu_assign_pointer(net_families[family], NULL);
2389 2390 2391 2392
	spin_unlock(&net_family_lock);

	synchronize_rcu();

2393
	printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
L
Linus Torvalds 已提交
2394
}
2395
EXPORT_SYMBOL(sock_unregister);
L
Linus Torvalds 已提交
2396

2397
static int __init sock_init(void)
L
Linus Torvalds 已提交
2398
{
N
Nick Piggin 已提交
2399 2400
	int err;

L
Linus Torvalds 已提交
2401
	/*
2402
	 *      Initialize sock SLAB cache.
L
Linus Torvalds 已提交
2403
	 */
2404

L
Linus Torvalds 已提交
2405 2406 2407
	sk_init();

	/*
2408
	 *      Initialize skbuff SLAB cache
L
Linus Torvalds 已提交
2409 2410 2411 2412
	 */
	skb_init();

	/*
2413
	 *      Initialize the protocols module.
L
Linus Torvalds 已提交
2414 2415 2416
	 */

	init_inodecache();
N
Nick Piggin 已提交
2417 2418 2419 2420

	err = register_filesystem(&sock_fs_type);
	if (err)
		goto out_fs;
L
Linus Torvalds 已提交
2421
	sock_mnt = kern_mount(&sock_fs_type);
N
Nick Piggin 已提交
2422 2423 2424 2425
	if (IS_ERR(sock_mnt)) {
		err = PTR_ERR(sock_mnt);
		goto out_mount;
	}
2426 2427

	/* The real protocol initialization is performed in later initcalls.
L
Linus Torvalds 已提交
2428 2429 2430 2431 2432
	 */

#ifdef CONFIG_NETFILTER
	netfilter_init();
#endif
2433

2434 2435 2436 2437
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
	skb_timestamping_init();
#endif

N
Nick Piggin 已提交
2438 2439 2440 2441 2442 2443 2444
out:
	return err;

out_mount:
	unregister_filesystem(&sock_fs_type);
out_fs:
	goto out;
L
Linus Torvalds 已提交
2445 2446
}

2447 2448
core_initcall(sock_init);	/* early initcall */

L
Linus Torvalds 已提交
2449 2450 2451 2452 2453 2454
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
	int cpu;
	int counter = 0;

2455
	for_each_possible_cpu(cpu)
2456
	    counter += per_cpu(sockets_in_use, cpu);
L
Linus Torvalds 已提交
2457 2458 2459 2460 2461 2462 2463

	/* It can be negative, by the way. 8) */
	if (counter < 0)
		counter = 0;

	seq_printf(seq, "sockets: used %d\n", counter);
}
2464
#endif				/* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2465

2466
#ifdef CONFIG_COMPAT
2467 2468
static int do_siocgstamp(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_timeval __user *up)
2469 2470 2471 2472 2473 2474
{
	mm_segment_t old_fs = get_fs();
	struct timeval ktv;
	int err;

	set_fs(KERNEL_DS);
2475
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2476 2477 2478 2479 2480 2481 2482 2483
	set_fs(old_fs);
	if (!err) {
		err = put_user(ktv.tv_sec, &up->tv_sec);
		err |= __put_user(ktv.tv_usec, &up->tv_usec);
	}
	return err;
}

2484 2485
static int do_siocgstampns(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_timespec __user *up)
2486 2487 2488 2489 2490 2491
{
	mm_segment_t old_fs = get_fs();
	struct timespec kts;
	int err;

	set_fs(KERNEL_DS);
2492
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2493 2494 2495 2496 2497 2498 2499 2500
	set_fs(old_fs);
	if (!err) {
		err = put_user(kts.tv_sec, &up->tv_sec);
		err |= __put_user(kts.tv_nsec, &up->tv_nsec);
	}
	return err;
}

2501
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2502 2503 2504 2505 2506
{
	struct ifreq __user *uifr;
	int err;

	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2507
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2508 2509
		return -EFAULT;

2510
	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2511 2512 2513
	if (err)
		return err;

2514
	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2515 2516 2517 2518 2519
		return -EFAULT;

	return 0;
}

2520
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2521
{
2522
	struct compat_ifconf ifc32;
2523 2524
	struct ifconf ifc;
	struct ifconf __user *uifc;
2525
	struct compat_ifreq __user *ifr32;
2526 2527 2528 2529
	struct ifreq __user *ifr;
	unsigned int i, j;
	int err;

2530
	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2531 2532 2533 2534 2535 2536 2537 2538
		return -EFAULT;

	if (ifc32.ifcbuf == 0) {
		ifc32.ifc_len = 0;
		ifc.ifc_len = 0;
		ifc.ifc_req = NULL;
		uifc = compat_alloc_user_space(sizeof(struct ifconf));
	} else {
2539 2540
		size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
			sizeof(struct ifreq);
2541 2542 2543 2544
		uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
		ifc.ifc_len = len;
		ifr = ifc.ifc_req = (void __user *)(uifc + 1);
		ifr32 = compat_ptr(ifc32.ifcbuf);
2545
		for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2546
			if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2547 2548 2549 2550 2551 2552 2553 2554
				return -EFAULT;
			ifr++;
			ifr32++;
		}
	}
	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
		return -EFAULT;

2555
	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2556 2557 2558 2559 2560 2561 2562 2563 2564
	if (err)
		return err;

	if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
		return -EFAULT;

	ifr = ifc.ifc_req;
	ifr32 = compat_ptr(ifc32.ifcbuf);
	for (i = 0, j = 0;
2565 2566 2567
	     i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
	     i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
		if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2568 2569 2570 2571 2572 2573 2574 2575 2576 2577
			return -EFAULT;
		ifr32++;
		ifr++;
	}

	if (ifc32.ifcbuf == 0) {
		/* Translate from 64-bit structure multiple to
		 * a 32-bit one.
		 */
		i = ifc.ifc_len;
2578
		i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2579 2580 2581 2582
		ifc32.ifc_len = i;
	} else {
		ifc32.ifc_len = i;
	}
2583
	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2584 2585 2586 2587 2588
		return -EFAULT;

	return 0;
}

2589
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2590
{
2591 2592 2593 2594
	struct compat_ethtool_rxnfc __user *compat_rxnfc;
	bool convert_in = false, convert_out = false;
	size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
	struct ethtool_rxnfc __user *rxnfc;
2595
	struct ifreq __user *ifr;
2596 2597
	u32 rule_cnt = 0, actual_rule_cnt;
	u32 ethcmd;
2598
	u32 data;
2599
	int ret;
2600

2601 2602
	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
		return -EFAULT;
2603

2604 2605 2606
	compat_rxnfc = compat_ptr(data);

	if (get_user(ethcmd, &compat_rxnfc->cmd))
2607 2608
		return -EFAULT;

2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638
	/* Most ethtool structures are defined without padding.
	 * Unfortunately struct ethtool_rxnfc is an exception.
	 */
	switch (ethcmd) {
	default:
		break;
	case ETHTOOL_GRXCLSRLALL:
		/* Buffer size is variable */
		if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
			return -EFAULT;
		if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
			return -ENOMEM;
		buf_size += rule_cnt * sizeof(u32);
		/* fall through */
	case ETHTOOL_GRXRINGS:
	case ETHTOOL_GRXCLSRLCNT:
	case ETHTOOL_GRXCLSRULE:
		convert_out = true;
		/* fall through */
	case ETHTOOL_SRXCLSRLDEL:
	case ETHTOOL_SRXCLSRLINS:
		buf_size += sizeof(struct ethtool_rxnfc);
		convert_in = true;
		break;
	}

	ifr = compat_alloc_user_space(buf_size);
	rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);

	if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2639 2640
		return -EFAULT;

2641 2642
	if (put_user(convert_in ? rxnfc : compat_ptr(data),
		     &ifr->ifr_ifru.ifru_data))
2643 2644
		return -EFAULT;

2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707
	if (convert_in) {
		/* We expect there to be holes between fs.m_u and
		 * fs.ring_cookie and at the end of fs, but nowhere else.
		 */
		BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_u) +
			     sizeof(compat_rxnfc->fs.m_u) !=
			     offsetof(struct ethtool_rxnfc, fs.m_u) +
			     sizeof(rxnfc->fs.m_u));
		BUILD_BUG_ON(
			offsetof(struct compat_ethtool_rxnfc, fs.location) -
			offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
			offsetof(struct ethtool_rxnfc, fs.location) -
			offsetof(struct ethtool_rxnfc, fs.ring_cookie));

		if (copy_in_user(rxnfc, compat_rxnfc,
				 (void *)(&rxnfc->fs.m_u + 1) -
				 (void *)rxnfc) ||
		    copy_in_user(&rxnfc->fs.ring_cookie,
				 &compat_rxnfc->fs.ring_cookie,
				 (void *)(&rxnfc->fs.location + 1) -
				 (void *)&rxnfc->fs.ring_cookie) ||
		    copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
				 sizeof(rxnfc->rule_cnt)))
			return -EFAULT;
	}

	ret = dev_ioctl(net, SIOCETHTOOL, ifr);
	if (ret)
		return ret;

	if (convert_out) {
		if (copy_in_user(compat_rxnfc, rxnfc,
				 (const void *)(&rxnfc->fs.m_u + 1) -
				 (const void *)rxnfc) ||
		    copy_in_user(&compat_rxnfc->fs.ring_cookie,
				 &rxnfc->fs.ring_cookie,
				 (const void *)(&rxnfc->fs.location + 1) -
				 (const void *)&rxnfc->fs.ring_cookie) ||
		    copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
				 sizeof(rxnfc->rule_cnt)))
			return -EFAULT;

		if (ethcmd == ETHTOOL_GRXCLSRLALL) {
			/* As an optimisation, we only copy the actual
			 * number of rules that the underlying
			 * function returned.  Since Mallory might
			 * change the rule count in user memory, we
			 * check that it is less than the rule count
			 * originally given (as the user buffer size),
			 * which has been range-checked.
			 */
			if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
				return -EFAULT;
			if (actual_rule_cnt < rule_cnt)
				rule_cnt = actual_rule_cnt;
			if (copy_in_user(&compat_rxnfc->rule_locs[0],
					 &rxnfc->rule_locs[0],
					 rule_cnt * sizeof(u32)))
				return -EFAULT;
		}
	}

	return 0;
2708 2709
}

2710 2711 2712 2713 2714 2715
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2716
	uifr = compat_alloc_user_space(sizeof(*uifr));
2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
		return -EFAULT;

	if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
		return -EFAULT;

	uptr = compat_ptr(uptr32);

	if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
		return -EFAULT;

	return dev_ioctl(net, SIOCWANDEV, uifr);
}

2731 2732
static int bond_ioctl(struct net *net, unsigned int cmd,
			 struct compat_ifreq __user *ifr32)
2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745
{
	struct ifreq kifr;
	struct ifreq __user *uifr;
	mm_segment_t old_fs;
	int err;
	u32 data;
	void __user *datap;

	switch (cmd) {
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
2746
		if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2747 2748 2749
			return -EFAULT;

		old_fs = get_fs();
2750
		set_fs(KERNEL_DS);
2751 2752
		err = dev_ioctl(net, cmd,
				(struct ifreq __user __force *) &kifr);
2753
		set_fs(old_fs);
2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768

		return err;
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
		uifr = compat_alloc_user_space(sizeof(*uifr));
		if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
			return -EFAULT;

		if (get_user(data, &ifr32->ifr_ifru.ifru_data))
			return -EFAULT;

		datap = compat_ptr(data);
		if (put_user(datap, &uifr->ifr_ifru.ifru_data))
			return -EFAULT;

2769
		return dev_ioctl(net, cmd, uifr);
2770 2771
	default:
		return -EINVAL;
2772
	}
2773 2774
}

2775 2776
static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
				 struct compat_ifreq __user *u_ifreq32)
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800
{
	struct ifreq __user *u_ifreq64;
	char tmp_buf[IFNAMSIZ];
	void __user *data64;
	u32 data32;

	if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
			   IFNAMSIZ))
		return -EFAULT;
	if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
		return -EFAULT;
	data64 = compat_ptr(data32);

	u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));

	/* Don't check these user accesses, just let that get trapped
	 * in the ioctl handler instead.
	 */
	if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
			 IFNAMSIZ))
		return -EFAULT;
	if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
		return -EFAULT;

2801
	return dev_ioctl(net, cmd, u_ifreq64);
2802 2803
}

2804 2805
static int dev_ifsioc(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_ifreq __user *uifr32)
2806
{
2807
	struct ifreq __user *uifr;
2808 2809
	int err;

2810 2811 2812 2813 2814 2815
	uifr = compat_alloc_user_space(sizeof(*uifr));
	if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
		return -EFAULT;

	err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);

2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827
	if (!err) {
		switch (cmd) {
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFINDEX:
		case SIOCGIFADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFNETMASK:
2828
		case SIOCGIFPFLAGS:
2829
		case SIOCGIFTXQLEN:
2830 2831
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
2832
			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2833 2834 2835 2836 2837 2838 2839
				err = -EFAULT;
			break;
		}
	}
	return err;
}

2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859
static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
			struct compat_ifreq __user *uifr32)
{
	struct ifreq ifr;
	struct compat_ifmap __user *uifmap32;
	mm_segment_t old_fs;
	int err;

	uifmap32 = &uifr32->ifr_ifru.ifru_map;
	err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
	err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
	err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
	err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
	err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
	err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
	err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
	if (err)
		return -EFAULT;

	old_fs = get_fs();
2860
	set_fs(KERNEL_DS);
2861
	err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
2862
	set_fs(old_fs);
2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883

	if (cmd == SIOCGIFMAP && !err) {
		err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
		err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
		err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
		err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
		err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
		err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
		err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
		if (err)
			err = -EFAULT;
	}
	return err;
}

static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2884
	uifr = compat_alloc_user_space(sizeof(*uifr));
2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
		return -EFAULT;

	if (get_user(uptr32, &uifr32->ifr_data))
		return -EFAULT;

	uptr = compat_ptr(uptr32);

	if (put_user(uptr, &uifr->ifr_data))
		return -EFAULT;

	return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
}

2899
struct rtentry32 {
2900
	u32		rt_pad1;
2901 2902 2903
	struct sockaddr rt_dst;         /* target address               */
	struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
	struct sockaddr rt_genmask;     /* target network mask (IP)     */
2904 2905 2906 2907 2908 2909 2910
	unsigned short	rt_flags;
	short		rt_pad2;
	u32		rt_pad3;
	unsigned char	rt_tos;
	unsigned char	rt_class;
	short		rt_pad4;
	short		rt_metric;      /* +1 for binary compatibility! */
2911
	/* char * */ u32 rt_dev;        /* forcing the device at add    */
2912 2913
	u32		rt_mtu;         /* per route MTU/Window         */
	u32		rt_window;      /* Window clamping              */
2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929
	unsigned short  rt_irtt;        /* Initial RTT                  */
};

struct in6_rtmsg32 {
	struct in6_addr		rtmsg_dst;
	struct in6_addr		rtmsg_src;
	struct in6_addr		rtmsg_gateway;
	u32			rtmsg_type;
	u16			rtmsg_dst_len;
	u16			rtmsg_src_len;
	u32			rtmsg_metric;
	u32			rtmsg_info;
	u32			rtmsg_flags;
	s32			rtmsg_ifindex;
};

2930 2931
static int routing_ioctl(struct net *net, struct socket *sock,
			 unsigned int cmd, void __user *argp)
2932 2933 2934 2935 2936 2937 2938 2939 2940
{
	int ret;
	void *r = NULL;
	struct in6_rtmsg r6;
	struct rtentry r4;
	char devname[16];
	u32 rtdev;
	mm_segment_t old_fs = get_fs();

2941 2942
	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
		struct in6_rtmsg32 __user *ur6 = argp;
2943
		ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
2944
			3 * sizeof(struct in6_addr));
2945 2946 2947 2948 2949 2950 2951
		ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
		ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
		ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
		ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
		ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
		ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
		ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
2952 2953 2954

		r = (void *) &r6;
	} else { /* ipv4 */
2955
		struct rtentry32 __user *ur4 = argp;
2956
		ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
2957
					3 * sizeof(struct sockaddr));
2958 2959 2960 2961 2962 2963
		ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
		ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
		ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
		ret |= __get_user(r4.rt_window, &(ur4->rt_window));
		ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
		ret |= __get_user(rtdev, &(ur4->rt_dev));
2964
		if (rtdev) {
2965
			ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
2966 2967
			r4.rt_dev = (char __user __force *)devname;
			devname[15] = 0;
2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978
		} else
			r4.rt_dev = NULL;

		r = (void *) &r4;
	}

	if (ret) {
		ret = -EFAULT;
		goto out;
	}

2979
	set_fs(KERNEL_DS);
2980
	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
2981
	set_fs(old_fs);
2982 2983 2984 2985 2986 2987 2988 2989 2990

out:
	return ret;
}

/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
 * for some operations; this forces use of the newer bridge-utils that
 * use compatiable ioctls
 */
2991
static int old_bridge_ioctl(compat_ulong_t __user *argp)
2992
{
2993
	compat_ulong_t tmp;
2994

2995
	if (get_user(tmp, argp))
2996 2997 2998 2999 3000 3001
		return -EFAULT;
	if (tmp == BRCTL_GET_VERSION)
		return BRCTL_VERSION + 1;
	return -EINVAL;
}

3002 3003 3004 3005 3006 3007
static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
			 unsigned int cmd, unsigned long arg)
{
	void __user *argp = compat_ptr(arg);
	struct sock *sk = sock->sk;
	struct net *net = sock_net(sk);
3008

3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
		return siocdevprivate_ioctl(net, cmd, argp);

	switch (cmd) {
	case SIOCSIFBR:
	case SIOCGIFBR:
		return old_bridge_ioctl(argp);
	case SIOCGIFNAME:
		return dev_ifname32(net, argp);
	case SIOCGIFCONF:
		return dev_ifconf(net, argp);
	case SIOCETHTOOL:
		return ethtool_ioctl(net, argp);
3022 3023
	case SIOCWANDEV:
		return compat_siocwandev(net, argp);
3024 3025 3026
	case SIOCGIFMAP:
	case SIOCSIFMAP:
		return compat_sioc_ifmap(net, cmd, argp);
3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
	case SIOCBONDCHANGEACTIVE:
		return bond_ioctl(net, cmd, argp);
	case SIOCADDRT:
	case SIOCDELRT:
		return routing_ioctl(net, sock, cmd, argp);
	case SIOCGSTAMP:
		return do_siocgstamp(net, sock, cmd, argp);
	case SIOCGSTAMPNS:
		return do_siocgstampns(net, sock, cmd, argp);
3041 3042
	case SIOCSHWTSTAMP:
		return compat_siocshwtstamp(net, argp);
3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084

	case FIOSETOWN:
	case SIOCSPGRP:
	case FIOGETOWN:
	case SIOCGPGRP:
	case SIOCBRADDBR:
	case SIOCBRDELBR:
	case SIOCGIFVLAN:
	case SIOCSIFVLAN:
	case SIOCADDDLCI:
	case SIOCDELDLCI:
		return sock_ioctl(file, cmd, arg);

	case SIOCGIFFLAGS:
	case SIOCSIFFLAGS:
	case SIOCGIFMETRIC:
	case SIOCSIFMETRIC:
	case SIOCGIFMTU:
	case SIOCSIFMTU:
	case SIOCGIFMEM:
	case SIOCSIFMEM:
	case SIOCGIFHWADDR:
	case SIOCSIFHWADDR:
	case SIOCADDMULTI:
	case SIOCDELMULTI:
	case SIOCGIFINDEX:
	case SIOCGIFADDR:
	case SIOCSIFADDR:
	case SIOCSIFHWBROADCAST:
	case SIOCDIFADDR:
	case SIOCGIFBRDADDR:
	case SIOCSIFBRDADDR:
	case SIOCGIFDSTADDR:
	case SIOCSIFDSTADDR:
	case SIOCGIFNETMASK:
	case SIOCSIFNETMASK:
	case SIOCSIFPFLAGS:
	case SIOCGIFPFLAGS:
	case SIOCGIFTXQLEN:
	case SIOCSIFTXQLEN:
	case SIOCBRADDIF:
	case SIOCBRDELIF:
3085 3086 3087 3088
	case SIOCSIFNAME:
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
3089
		return dev_ifsioc(net, sock, cmd, argp);
3090

3091 3092 3093 3094
	case SIOCSARP:
	case SIOCGARP:
	case SIOCDARP:
	case SIOCATMARK:
3095 3096 3097 3098 3099 3100 3101 3102
		return sock_do_ioctl(net, sock, cmd, arg);
	}

	/* Prevent warning from compat_sys_ioctl, these always
	 * result in -EINVAL in the native case anyway. */
	switch (cmd) {
	case SIOCRTMSG:
	case SIOCGIFCOUNT:
3103 3104 3105
	case SIOCSRARP:
	case SIOCGRARP:
	case SIOCDRARP:
3106 3107 3108 3109
	case SIOCSIFLINK:
	case SIOCGIFSLAVE:
	case SIOCSIFSLAVE:
		return -EINVAL;
3110 3111 3112 3113
	}

	return -ENOIOCTLCMD;
}
3114

3115
static long compat_sock_ioctl(struct file *file, unsigned cmd,
3116
			      unsigned long arg)
3117 3118 3119
{
	struct socket *sock = file->private_data;
	int ret = -ENOIOCTLCMD;
3120 3121 3122 3123 3124
	struct sock *sk;
	struct net *net;

	sk = sock->sk;
	net = sock_net(sk);
3125 3126 3127 3128

	if (sock->ops->compat_ioctl)
		ret = sock->ops->compat_ioctl(sock, cmd, arg);

3129 3130 3131 3132
	if (ret == -ENOIOCTLCMD &&
	    (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
		ret = compat_wext_handle_ioctl(net, cmd, arg);

3133 3134 3135
	if (ret == -ENOIOCTLCMD)
		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);

3136 3137 3138 3139
	return ret;
}
#endif

3140 3141 3142 3143
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
	return sock->ops->bind(sock, addr, addrlen);
}
3144
EXPORT_SYMBOL(kernel_bind);
3145 3146 3147 3148 3149

int kernel_listen(struct socket *sock, int backlog)
{
	return sock->ops->listen(sock, backlog);
}
3150
EXPORT_SYMBOL(kernel_listen);
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164

int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
{
	struct sock *sk = sock->sk;
	int err;

	err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
			       newsock);
	if (err < 0)
		goto done;

	err = sock->ops->accept(sock, *newsock, flags);
	if (err < 0) {
		sock_release(*newsock);
3165
		*newsock = NULL;
3166 3167 3168 3169
		goto done;
	}

	(*newsock)->ops = sock->ops;
3170
	__module_get((*newsock)->ops->owner);
3171 3172 3173 3174

done:
	return err;
}
3175
EXPORT_SYMBOL(kernel_accept);
3176 3177

int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3178
		   int flags)
3179 3180 3181
{
	return sock->ops->connect(sock, addr, addrlen, flags);
}
3182
EXPORT_SYMBOL(kernel_connect);
3183 3184 3185 3186 3187 3188

int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 0);
}
3189
EXPORT_SYMBOL(kernel_getsockname);
3190 3191 3192 3193 3194 3195

int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 1);
}
3196
EXPORT_SYMBOL(kernel_getpeername);
3197 3198 3199 3200 3201

int kernel_getsockopt(struct socket *sock, int level, int optname,
			char *optval, int *optlen)
{
	mm_segment_t oldfs = get_fs();
3202 3203
	char __user *uoptval;
	int __user *uoptlen;
3204 3205
	int err;

3206 3207 3208
	uoptval = (char __user __force *) optval;
	uoptlen = (int __user __force *) optlen;

3209 3210
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3211
		err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3212
	else
3213 3214
		err = sock->ops->getsockopt(sock, level, optname, uoptval,
					    uoptlen);
3215 3216 3217
	set_fs(oldfs);
	return err;
}
3218
EXPORT_SYMBOL(kernel_getsockopt);
3219 3220

int kernel_setsockopt(struct socket *sock, int level, int optname,
3221
			char *optval, unsigned int optlen)
3222 3223
{
	mm_segment_t oldfs = get_fs();
3224
	char __user *uoptval;
3225 3226
	int err;

3227 3228
	uoptval = (char __user __force *) optval;

3229 3230
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3231
		err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3232
	else
3233
		err = sock->ops->setsockopt(sock, level, optname, uoptval,
3234 3235 3236 3237
					    optlen);
	set_fs(oldfs);
	return err;
}
3238
EXPORT_SYMBOL(kernel_setsockopt);
3239 3240 3241 3242

int kernel_sendpage(struct socket *sock, struct page *page, int offset,
		    size_t size, int flags)
{
3243 3244
	sock_update_classid(sock->sk);

3245 3246 3247 3248 3249
	if (sock->ops->sendpage)
		return sock->ops->sendpage(sock, page, offset, size, flags);

	return sock_no_sendpage(sock, page, offset, size, flags);
}
3250
EXPORT_SYMBOL(kernel_sendpage);
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262

int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
{
	mm_segment_t oldfs = get_fs();
	int err;

	set_fs(KERNEL_DS);
	err = sock->ops->ioctl(sock, cmd, arg);
	set_fs(oldfs);

	return err;
}
3263
EXPORT_SYMBOL(kernel_sock_ioctl);
3264

3265 3266 3267 3268 3269
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
	return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);