socket.c 81.8 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;
}

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);
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	kfree_rcu(wq, 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_pseudo(sock_mnt->mnt_sb);
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	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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	if (sock_flag(sk, SOCK_WIFI_STATUS))
		*tx_flags |= SKBTX_WIFI_STATUS;
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	return 0;
}
EXPORT_SYMBOL(sock_tx_timestamp);

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

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	sock_update_classid(sock->sk);

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	sock_update_netprioidx(sock->sk);

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

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

564 565 566 567 568 569 570 571
static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
				 struct msghdr *msg, size_t size)
{
	int err = security_socket_sendmsg(sock, msg, size);

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

L
Linus Torvalds 已提交
572 573 574 575 576 577 578 579 580 581 582 583 584
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;
}
585
EXPORT_SYMBOL(sock_sendmsg);
L
Linus Torvalds 已提交
586

587
static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
588 589 590 591 592 593 594 595 596 597 598 599 600
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

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

L
Linus Torvalds 已提交
601 602 603 604 605 606 607 608 609 610 611
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
	 */
612
	msg->msg_iov = (struct iovec *)vec;
L
Linus Torvalds 已提交
613 614 615 616 617
	msg->msg_iovlen = num;
	result = sock_sendmsg(sock, msg, size);
	set_fs(oldfs);
	return result;
}
618
EXPORT_SYMBOL(kernel_sendmsg);
L
Linus Torvalds 已提交
619

620 621 622 623 624 625 626 627 628 629
static int ktime2ts(ktime_t kt, struct timespec *ts)
{
	if (kt.tv64) {
		*ts = ktime_to_timespec(kt);
		return 1;
	} else {
		return 0;
	}
}

630 631 632 633 634 635
/*
 * 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)
{
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
	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 {
654
			skb_get_timestampns(skb, &ts[0]);
655
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
656
				 sizeof(ts[0]), &ts[0]);
657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673
		}
	}


	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;
674
	}
675 676 677
	if (!empty)
		put_cmsg(msg, SOL_SOCKET,
			 SCM_TIMESTAMPING, sizeof(ts), &ts);
678
}
679 680
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);

681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
	struct sk_buff *skb)
{
	int ack;

	if (!sock_flag(sk, SOCK_WIFI_STATUS))
		return;
	if (!skb->wifi_acked_valid)
		return;

	ack = skb->wifi_acked;

	put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
}
EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);

S
stephen hemminger 已提交
697 698
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
				   struct sk_buff *skb)
699 700 701 702 703 704
{
	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
		put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
			sizeof(__u32), &skb->dropcount);
}

705
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
706 707 708 709 710
	struct sk_buff *skb)
{
	sock_recv_timestamp(msg, sk, skb);
	sock_recv_drops(msg, sk, skb);
}
711
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
712

713 714
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
715 716 717
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);

718 719
	sock_update_classid(sock->sk);

L
Linus Torvalds 已提交
720 721 722 723 724 725 726 727 728
	si->sock = sock;
	si->scm = NULL;
	si->msg = msg;
	si->size = size;
	si->flags = flags;

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

729 730 731 732 733 734 735 736
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);
}

737
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
L
Linus Torvalds 已提交
738 739 740 741 742 743
		 size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

744
	init_sync_kiocb(&iocb, NULL);
L
Linus Torvalds 已提交
745 746 747 748 749 750
	iocb.private = &siocb;
	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
751
EXPORT_SYMBOL(sock_recvmsg);
L
Linus Torvalds 已提交
752

753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
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;
}

768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
/**
 * 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.
 */
783 784
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
785 786 787 788 789 790 791 792 793
{
	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
	 */
794
	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
L
Linus Torvalds 已提交
795 796 797 798
	result = sock_recvmsg(sock, msg, size, flags);
	set_fs(oldfs);
	return result;
}
799
EXPORT_SYMBOL(kernel_recvmsg);
L
Linus Torvalds 已提交
800 801 802 803 804 805

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

806 807
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
808 809 810 811
{
	struct socket *sock;
	int flags;

812 813 814 815 816 817
	sock = file->private_data;

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

818
	return kernel_sendpage(sock, page, offset, size, flags);
819
}
L
Linus Torvalds 已提交
820

J
Jens Axboe 已提交
821
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
822
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
823 824 825 826
				unsigned int flags)
{
	struct socket *sock = file->private_data;

827 828 829
	if (unlikely(!sock->ops->splice_read))
		return -EINVAL;

830 831
	sock_update_classid(sock->sk);

J
Jens Axboe 已提交
832 833 834
	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}

835
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
836
					 struct sock_iocb *siocb)
837 838 839 840 841
{
	if (!is_sync_kiocb(iocb)) {
		siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
		if (!siocb)
			return NULL;
L
Linus Torvalds 已提交
842 843 844
		iocb->ki_dtor = sock_aio_dtor;
	}

845 846 847
	siocb->kiocb = iocb;
	iocb->private = siocb;
	return siocb;
L
Linus Torvalds 已提交
848 849
}

850
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
851 852
		struct file *file, const struct iovec *iov,
		unsigned long nr_segs)
853 854 855 856
{
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
857

858 859
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
860

861 862 863 864
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
865
	msg->msg_iov = (struct iovec *)iov;
866 867 868 869 870 871
	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);
}

872 873
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
874 875 876
{
	struct sock_iocb siocb, *x;

L
Linus Torvalds 已提交
877 878
	if (pos != 0)
		return -ESPIPE;
879 880

	if (iocb->ki_left == 0)	/* Match SYS5 behaviour */
L
Linus Torvalds 已提交
881 882
		return 0;

883 884

	x = alloc_sock_iocb(iocb, &siocb);
885 886
	if (!x)
		return -ENOMEM;
887
	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
888 889
}

890
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
891 892
			struct file *file, const struct iovec *iov,
			unsigned long nr_segs)
L
Linus Torvalds 已提交
893
{
894 895 896
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
897

898 899
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
900

901 902 903 904
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
905
	msg->msg_iov = (struct iovec *)iov;
906 907 908 909
	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
910

911
	return __sock_sendmsg(iocb, sock, msg, size);
L
Linus Torvalds 已提交
912 913
}

914 915
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos)
916 917
{
	struct sock_iocb siocb, *x;
L
Linus Torvalds 已提交
918

919 920
	if (pos != 0)
		return -ESPIPE;
921 922

	x = alloc_sock_iocb(iocb, &siocb);
923 924
	if (!x)
		return -ENOMEM;
L
Linus Torvalds 已提交
925

926
	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
927 928 929 930 931 932 933
}

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

A
Arjan van de Ven 已提交
934
static DEFINE_MUTEX(br_ioctl_mutex);
935
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
L
Linus Torvalds 已提交
936

937
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
L
Linus Torvalds 已提交
938
{
A
Arjan van de Ven 已提交
939
	mutex_lock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
940
	br_ioctl_hook = hook;
A
Arjan van de Ven 已提交
941
	mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
942 943 944
}
EXPORT_SYMBOL(brioctl_set);

A
Arjan van de Ven 已提交
945
static DEFINE_MUTEX(vlan_ioctl_mutex);
946
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
L
Linus Torvalds 已提交
947

948
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
L
Linus Torvalds 已提交
949
{
A
Arjan van de Ven 已提交
950
	mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
951
	vlan_ioctl_hook = hook;
A
Arjan van de Ven 已提交
952
	mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
953 954 955
}
EXPORT_SYMBOL(vlan_ioctl_set);

A
Arjan van de Ven 已提交
956
static DEFINE_MUTEX(dlci_ioctl_mutex);
957
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
L
Linus Torvalds 已提交
958

959
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
L
Linus Torvalds 已提交
960
{
A
Arjan van de Ven 已提交
961
	mutex_lock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
962
	dlci_ioctl_hook = hook;
A
Arjan van de Ven 已提交
963
	mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
964 965 966
}
EXPORT_SYMBOL(dlci_ioctl_set);

967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
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
985 986 987 988 989 990 991 992
/*
 *	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;
993
	struct sock *sk;
L
Linus Torvalds 已提交
994 995
	void __user *argp = (void __user *)arg;
	int pid, err;
996
	struct net *net;
L
Linus Torvalds 已提交
997

998
	sock = file->private_data;
999
	sk = sock->sk;
1000
	net = sock_net(sk);
L
Linus Torvalds 已提交
1001
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1002
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1003
	} else
J
Johannes Berg 已提交
1004
#ifdef CONFIG_WEXT_CORE
L
Linus Torvalds 已提交
1005
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1006
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1007
	} else
J
Johannes Berg 已提交
1008
#endif
1009
		switch (cmd) {
L
Linus Torvalds 已提交
1010 1011 1012 1013 1014 1015 1016 1017 1018
		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:
1019
			err = put_user(f_getown(sock->file),
1020
				       (int __user *)argp);
L
Linus Torvalds 已提交
1021 1022 1023 1024 1025 1026 1027 1028 1029
			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
1030
			mutex_lock(&br_ioctl_mutex);
1031
			if (br_ioctl_hook)
1032
				err = br_ioctl_hook(net, cmd, argp);
A
Arjan van de Ven 已提交
1033
			mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1034 1035 1036 1037 1038 1039 1040
			break;
		case SIOCGIFVLAN:
		case SIOCSIFVLAN:
			err = -ENOPKG;
			if (!vlan_ioctl_hook)
				request_module("8021q");

A
Arjan van de Ven 已提交
1041
			mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1042
			if (vlan_ioctl_hook)
1043
				err = vlan_ioctl_hook(net, argp);
A
Arjan van de Ven 已提交
1044
			mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049 1050 1051
			break;
		case SIOCADDDLCI:
		case SIOCDELDLCI:
			err = -ENOPKG;
			if (!dlci_ioctl_hook)
				request_module("dlci");

1052 1053
			mutex_lock(&dlci_ioctl_mutex);
			if (dlci_ioctl_hook)
L
Linus Torvalds 已提交
1054
				err = dlci_ioctl_hook(cmd, argp);
1055
			mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1056 1057
			break;
		default:
1058
			err = sock_do_ioctl(net, sock, cmd, arg);
L
Linus Torvalds 已提交
1059
			break;
1060
		}
L
Linus Torvalds 已提交
1061 1062 1063 1064 1065 1066 1067
	return err;
}

int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
	int err;
	struct socket *sock = NULL;
1068

L
Linus Torvalds 已提交
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
	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
1080 1081 1082 1083
	err = security_socket_post_create(sock, family, type, protocol, 1);
	if (err)
		goto out_release;

L
Linus Torvalds 已提交
1084 1085 1086
out:
	*res = sock;
	return err;
V
Venkat Yekkirala 已提交
1087 1088 1089 1090
out_release:
	sock_release(sock);
	sock = NULL;
	goto out;
L
Linus Torvalds 已提交
1091
}
1092
EXPORT_SYMBOL(sock_create_lite);
L
Linus Torvalds 已提交
1093 1094

/* No kernel lock held - perfect */
1095
static unsigned int sock_poll(struct file *file, poll_table *wait)
L
Linus Torvalds 已提交
1096 1097 1098 1099
{
	struct socket *sock;

	/*
1100
	 *      We can't return errors to poll, so it's either yes or no.
L
Linus Torvalds 已提交
1101
	 */
1102
	sock = file->private_data;
L
Linus Torvalds 已提交
1103 1104 1105
	return sock->ops->poll(file, sock, wait);
}

1106
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1107
{
1108
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
1109 1110 1111 1112

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

1113
static int sock_close(struct inode *inode, struct file *filp)
L
Linus Torvalds 已提交
1114 1115
{
	/*
1116 1117
	 *      It was possible the inode is NULL we were
	 *      closing an unfinished socket.
L
Linus Torvalds 已提交
1118 1119
	 */

1120
	if (!inode) {
L
Linus Torvalds 已提交
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
		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)
1136
 *	   or under socket lock
L
Linus Torvalds 已提交
1137 1138 1139 1140
 */

static int sock_fasync(int fd, struct file *filp, int on)
{
1141 1142
	struct socket *sock = filp->private_data;
	struct sock *sk = sock->sk;
1143
	struct socket_wq *wq;
L
Linus Torvalds 已提交
1144

1145
	if (sk == NULL)
L
Linus Torvalds 已提交
1146 1147 1148
		return -EINVAL;

	lock_sock(sk);
1149 1150
	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
1151

1152
	if (!wq->fasync_list)
1153 1154
		sock_reset_flag(sk, SOCK_FASYNC);
	else
E
Eric Dumazet 已提交
1155
		sock_set_flag(sk, SOCK_FASYNC);
L
Linus Torvalds 已提交
1156

1157
	release_sock(sk);
L
Linus Torvalds 已提交
1158 1159 1160
	return 0;
}

1161
/* This function may be called only under socket lock or callback_lock or rcu_lock */
L
Linus Torvalds 已提交
1162 1163 1164

int sock_wake_async(struct socket *sock, int how, int band)
{
1165 1166 1167 1168 1169 1170 1171 1172
	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
1173
		return -1;
1174
	}
1175
	switch (how) {
1176
	case SOCK_WAKE_WAITD:
L
Linus Torvalds 已提交
1177 1178 1179
		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
			break;
		goto call_kill;
1180
	case SOCK_WAKE_SPACE:
L
Linus Torvalds 已提交
1181 1182 1183
		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
			break;
		/* fall through */
1184
	case SOCK_WAKE_IO:
1185
call_kill:
1186
		kill_fasync(&wq->fasync_list, SIGIO, band);
L
Linus Torvalds 已提交
1187
		break;
1188
	case SOCK_WAKE_URG:
1189
		kill_fasync(&wq->fasync_list, SIGURG, band);
L
Linus Torvalds 已提交
1190
	}
1191
	rcu_read_unlock();
L
Linus Torvalds 已提交
1192 1193
	return 0;
}
1194
EXPORT_SYMBOL(sock_wake_async);
L
Linus Torvalds 已提交
1195

P
Pavel Emelyanov 已提交
1196
int __sock_create(struct net *net, int family, int type, int protocol,
1197
			 struct socket **res, int kern)
L
Linus Torvalds 已提交
1198 1199 1200
{
	int err;
	struct socket *sock;
1201
	const struct net_proto_family *pf;
L
Linus Torvalds 已提交
1202 1203

	/*
1204
	 *      Check protocol is in range
L
Linus Torvalds 已提交
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
	 */
	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) {
1217
		static int warned;
L
Linus Torvalds 已提交
1218 1219
		if (!warned) {
			warned = 1;
1220 1221
			printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
			       current->comm);
L
Linus Torvalds 已提交
1222 1223 1224 1225 1226 1227 1228
		}
		family = PF_PACKET;
	}

	err = security_socket_create(family, type, protocol, kern);
	if (err)
		return err;
1229

1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
	/*
	 *	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;

1245
#ifdef CONFIG_MODULES
1246 1247 1248
	/* 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
1249 1250 1251
	 * requested real, full-featured networking support upon configuration.
	 * Otherwise module support will break!
	 */
E
Eric Dumazet 已提交
1252
	if (rcu_access_pointer(net_families[family]) == NULL)
1253
		request_module("net-pf-%d", family);
L
Linus Torvalds 已提交
1254 1255
#endif

1256 1257 1258 1259 1260
	rcu_read_lock();
	pf = rcu_dereference(net_families[family]);
	err = -EAFNOSUPPORT;
	if (!pf)
		goto out_release;
L
Linus Torvalds 已提交
1261 1262 1263 1264 1265

	/*
	 * We will call the ->create function, that possibly is in a loadable
	 * module, so we have to bump that loadable module refcnt first.
	 */
1266
	if (!try_module_get(pf->owner))
L
Linus Torvalds 已提交
1267 1268
		goto out_release;

1269 1270 1271
	/* Now protected by module ref count */
	rcu_read_unlock();

1272
	err = pf->create(net, sock, protocol, kern);
1273
	if (err < 0)
L
Linus Torvalds 已提交
1274
		goto out_module_put;
1275

L
Linus Torvalds 已提交
1276 1277 1278 1279
	/*
	 * Now to bump the refcnt of the [loadable] module that owns this
	 * socket at sock_release time we decrement its refcnt.
	 */
1280 1281 1282
	if (!try_module_get(sock->ops->owner))
		goto out_module_busy;

L
Linus Torvalds 已提交
1283 1284 1285 1286
	/*
	 * Now that we're done with the ->create function, the [loadable]
	 * module can have its refcnt decremented
	 */
1287
	module_put(pf->owner);
V
Venkat Yekkirala 已提交
1288 1289
	err = security_socket_post_create(sock, family, type, protocol, kern);
	if (err)
1290
		goto out_sock_release;
1291
	*res = sock;
L
Linus Torvalds 已提交
1292

1293 1294 1295 1296
	return 0;

out_module_busy:
	err = -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1297
out_module_put:
1298 1299 1300
	sock->ops = NULL;
	module_put(pf->owner);
out_sock_release:
L
Linus Torvalds 已提交
1301
	sock_release(sock);
1302 1303 1304 1305 1306
	return err;

out_release:
	rcu_read_unlock();
	goto out_sock_release;
L
Linus Torvalds 已提交
1307
}
P
Pavel Emelyanov 已提交
1308
EXPORT_SYMBOL(__sock_create);
L
Linus Torvalds 已提交
1309 1310 1311

int sock_create(int family, int type, int protocol, struct socket **res)
{
1312
	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
L
Linus Torvalds 已提交
1313
}
1314
EXPORT_SYMBOL(sock_create);
L
Linus Torvalds 已提交
1315 1316 1317

int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
1318
	return __sock_create(&init_net, family, type, protocol, res, 1);
L
Linus Torvalds 已提交
1319
}
1320
EXPORT_SYMBOL(sock_create_kern);
L
Linus Torvalds 已提交
1321

1322
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
L
Linus Torvalds 已提交
1323 1324 1325
{
	int retval;
	struct socket *sock;
1326 1327
	int flags;

1328 1329 1330 1331 1332 1333
	/* 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);

1334
	flags = type & ~SOCK_TYPE_MASK;
1335
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1336 1337
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1338

U
Ulrich Drepper 已提交
1339 1340 1341
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1342 1343 1344 1345
	retval = sock_create(family, type, protocol, &sock);
	if (retval < 0)
		goto out;

1346
	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
L
Linus Torvalds 已提交
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
	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.
 */

1363 1364
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
		int __user *, usockvec)
L
Linus Torvalds 已提交
1365 1366 1367
{
	struct socket *sock1, *sock2;
	int fd1, fd2, err;
A
Al Viro 已提交
1368
	struct file *newfile1, *newfile2;
1369 1370 1371
	int flags;

	flags = type & ~SOCK_TYPE_MASK;
1372
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1373 1374
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1375

U
Ulrich Drepper 已提交
1376 1377 1378
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
	/*
	 * 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);
1393
	if (err < 0)
L
Linus Torvalds 已提交
1394 1395
		goto out_release_both;

1396
	fd1 = sock_alloc_file(sock1, &newfile1, flags);
1397 1398
	if (unlikely(fd1 < 0)) {
		err = fd1;
A
Al Viro 已提交
1399
		goto out_release_both;
1400
	}
L
Linus Torvalds 已提交
1401

1402
	fd2 = sock_alloc_file(sock2, &newfile2, flags);
1403 1404 1405 1406 1407 1408
	if (unlikely(fd2 < 0)) {
		err = fd2;
		fput(newfile1);
		put_unused_fd(fd1);
		sock_release(sock2);
		goto out;
A
Al Viro 已提交
1409 1410
	}

A
Al Viro 已提交
1411
	audit_fd_pair(fd1, fd2);
A
Al Viro 已提交
1412 1413
	fd_install(fd1, newfile1);
	fd_install(fd2, newfile2);
L
Linus Torvalds 已提交
1414 1415 1416 1417
	/* fd1 and fd2 may be already another descriptors.
	 * Not kernel problem.
	 */

1418
	err = put_user(fd1, &usockvec[0]);
L
Linus Torvalds 已提交
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
	if (!err)
		err = put_user(fd2, &usockvec[1]);
	if (!err)
		return 0;

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

out_release_both:
1429
	sock_release(sock2);
L
Linus Torvalds 已提交
1430
out_release_1:
1431
	sock_release(sock1);
L
Linus Torvalds 已提交
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
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).
 */

1444
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
L
Linus Torvalds 已提交
1445 1446
{
	struct socket *sock;
1447
	struct sockaddr_storage address;
1448
	int err, fput_needed;
L
Linus Torvalds 已提交
1449

1450
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1451
	if (sock) {
1452
		err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
1453 1454
		if (err >= 0) {
			err = security_socket_bind(sock,
1455
						   (struct sockaddr *)&address,
1456
						   addrlen);
1457 1458
			if (!err)
				err = sock->ops->bind(sock,
1459
						      (struct sockaddr *)
1460
						      &address, addrlen);
L
Linus Torvalds 已提交
1461
		}
1462
		fput_light(sock->file, fput_needed);
1463
	}
L
Linus Torvalds 已提交
1464 1465 1466 1467 1468 1469 1470 1471 1472
	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.
 */

1473
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
L
Linus Torvalds 已提交
1474 1475
{
	struct socket *sock;
1476
	int err, fput_needed;
1477
	int somaxconn;
1478 1479 1480

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
1481
		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1482 1483
		if ((unsigned)backlog > somaxconn)
			backlog = somaxconn;
L
Linus Torvalds 已提交
1484 1485

		err = security_socket_listen(sock, backlog);
1486 1487
		if (!err)
			err = sock->ops->listen(sock, backlog);
L
Linus Torvalds 已提交
1488

1489
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
	}
	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.
 */

1506 1507
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen, int, flags)
L
Linus Torvalds 已提交
1508 1509
{
	struct socket *sock, *newsock;
1510
	struct file *newfile;
1511
	int err, len, newfd, fput_needed;
1512
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1513

1514
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
U
Ulrich Drepper 已提交
1515 1516 1517 1518 1519
		return -EINVAL;

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

1520
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1521 1522 1523 1524
	if (!sock)
		goto out;

	err = -ENFILE;
1525 1526
	newsock = sock_alloc();
	if (!newsock)
L
Linus Torvalds 已提交
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
		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);

1538
	newfd = sock_alloc_file(newsock, &newfile, flags);
1539 1540
	if (unlikely(newfd < 0)) {
		err = newfd;
1541 1542
		sock_release(newsock);
		goto out_put;
1543 1544
	}

1545 1546
	err = security_socket_accept(sock, newsock);
	if (err)
1547
		goto out_fd;
1548

L
Linus Torvalds 已提交
1549 1550
	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
	if (err < 0)
1551
		goto out_fd;
L
Linus Torvalds 已提交
1552 1553

	if (upeer_sockaddr) {
1554
		if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1555
					  &len, 2) < 0) {
L
Linus Torvalds 已提交
1556
			err = -ECONNABORTED;
1557
			goto out_fd;
L
Linus Torvalds 已提交
1558
		}
1559 1560
		err = move_addr_to_user((struct sockaddr *)&address,
					len, upeer_sockaddr, upeer_addrlen);
L
Linus Torvalds 已提交
1561
		if (err < 0)
1562
			goto out_fd;
L
Linus Torvalds 已提交
1563 1564 1565 1566
	}

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

1567 1568
	fd_install(newfd, newfile);
	err = newfd;
L
Linus Torvalds 已提交
1569 1570

out_put:
1571
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1572 1573
out:
	return err;
1574
out_fd:
1575
	fput(newfile);
1576
	put_unused_fd(newfd);
L
Linus Torvalds 已提交
1577 1578 1579
	goto out_put;
}

1580 1581
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen)
U
Ulrich Drepper 已提交
1582
{
U
Ulrich Drepper 已提交
1583
	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
U
Ulrich Drepper 已提交
1584 1585
}

L
Linus Torvalds 已提交
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
/*
 *	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.
 */

1598 1599
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
		int, addrlen)
L
Linus Torvalds 已提交
1600 1601
{
	struct socket *sock;
1602
	struct sockaddr_storage address;
1603
	int err, fput_needed;
L
Linus Torvalds 已提交
1604

1605
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1606 1607
	if (!sock)
		goto out;
1608
	err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
L
Linus Torvalds 已提交
1609 1610 1611
	if (err < 0)
		goto out_put;

1612
	err =
1613
	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
L
Linus Torvalds 已提交
1614 1615 1616
	if (err)
		goto out_put;

1617
	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
L
Linus Torvalds 已提交
1618 1619
				 sock->file->f_flags);
out_put:
1620
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1621 1622 1623 1624 1625 1626 1627 1628 1629
out:
	return err;
}

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

1630 1631
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1632 1633
{
	struct socket *sock;
1634
	struct sockaddr_storage address;
1635
	int len, err, fput_needed;
1636

1637
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
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1638 1639 1640 1641 1642 1643 1644
	if (!sock)
		goto out;

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

1645
	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
L
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1646 1647
	if (err)
		goto out_put;
1648
	err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
L
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1649 1650

out_put:
1651
	fput_light(sock->file, fput_needed);
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1652 1653 1654 1655 1656 1657 1658 1659 1660
out:
	return err;
}

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

1661 1662
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
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1663 1664
{
	struct socket *sock;
1665
	struct sockaddr_storage address;
1666
	int len, err, fput_needed;
L
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1667

1668 1669
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
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1670 1671
		err = security_socket_getpeername(sock);
		if (err) {
1672
			fput_light(sock->file, fput_needed);
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1673 1674 1675
			return err;
		}

1676
		err =
1677
		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1678
				       1);
L
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1679
		if (!err)
1680
			err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
1681
						usockaddr_len);
1682
		fput_light(sock->file, fput_needed);
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1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
	}
	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.
 */

1693 1694 1695
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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1696 1697
{
	struct socket *sock;
1698
	struct sockaddr_storage address;
L
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1699 1700 1701
	int err;
	struct msghdr msg;
	struct iovec iov;
1702 1703
	int fput_needed;

1704 1705
	if (len > INT_MAX)
		len = INT_MAX;
1706 1707
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
1708
		goto out;
1709

1710 1711 1712 1713 1714 1715 1716 1717
	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;
1718
	if (addr) {
1719
		err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
L
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1720 1721
		if (err < 0)
			goto out_put;
1722
		msg.msg_name = (struct sockaddr *)&address;
1723
		msg.msg_namelen = addr_len;
L
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1724 1725 1726 1727 1728 1729
	}
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
	msg.msg_flags = flags;
	err = sock_sendmsg(sock, &msg, len);

1730
out_put:
1731
	fput_light(sock->file, fput_needed);
1732
out:
L
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1733 1734 1735 1736
	return err;
}

/*
1737
 *	Send a datagram down a socket.
L
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1738 1739
 */

1740 1741
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
		unsigned, flags)
L
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1742 1743 1744 1745 1746
{
	return sys_sendto(fd, buff, len, flags, NULL, 0);
}

/*
1747
 *	Receive a frame from the socket and optionally record the address of the
L
Linus Torvalds 已提交
1748 1749 1750 1751
 *	sender. We verify the buffers are writable and if needed move the
 *	sender address from kernel to user space.
 */

1752 1753 1754
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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1755 1756 1757 1758
{
	struct socket *sock;
	struct iovec iov;
	struct msghdr msg;
1759
	struct sockaddr_storage address;
1760
	int err, err2;
1761 1762
	int fput_needed;

1763 1764
	if (size > INT_MAX)
		size = INT_MAX;
1765
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
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1766
	if (!sock)
1767
		goto out;
L
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1768

1769 1770 1771 1772 1773 1774
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_iovlen = 1;
	msg.msg_iov = &iov;
	iov.iov_len = size;
	iov.iov_base = ubuf;
1775 1776
	msg.msg_name = (struct sockaddr *)&address;
	msg.msg_namelen = sizeof(address);
L
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1777 1778
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
1779
	err = sock_recvmsg(sock, &msg, size, flags);
L
Linus Torvalds 已提交
1780

1781
	if (err >= 0 && addr != NULL) {
1782 1783
		err2 = move_addr_to_user((struct sockaddr *)&address,
					 msg.msg_namelen, addr, addr_len);
1784 1785
		if (err2 < 0)
			err = err2;
L
Linus Torvalds 已提交
1786
	}
1787 1788

	fput_light(sock->file, fput_needed);
1789
out:
L
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1790 1791 1792 1793
	return err;
}

/*
1794
 *	Receive a datagram from a socket.
L
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1795 1796
 */

1797 1798
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
			 unsigned flags)
L
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1799 1800 1801 1802 1803 1804 1805 1806 1807
{
	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.
 */

1808 1809
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int, optlen)
L
Linus Torvalds 已提交
1810
{
1811
	int err, fput_needed;
L
Linus Torvalds 已提交
1812 1813 1814 1815
	struct socket *sock;

	if (optlen < 0)
		return -EINVAL;
1816 1817 1818 1819

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

		if (level == SOL_SOCKET)
1824 1825 1826
			err =
			    sock_setsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1827
		else
1828 1829 1830
			err =
			    sock->ops->setsockopt(sock, level, optname, optval,
						  optlen);
1831 1832
out_put:
		fput_light(sock->file, fput_needed);
L
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1833 1834 1835 1836 1837 1838 1839 1840 1841
	}
	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.
 */

1842 1843
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int __user *, optlen)
L
Linus Torvalds 已提交
1844
{
1845
	int err, fput_needed;
L
Linus Torvalds 已提交
1846 1847
	struct socket *sock;

1848 1849
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
1850 1851 1852
		err = security_socket_getsockopt(sock, level, optname);
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1853 1854

		if (level == SOL_SOCKET)
1855 1856 1857
			err =
			    sock_getsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1858
		else
1859 1860 1861
			err =
			    sock->ops->getsockopt(sock, level, optname, optval,
						  optlen);
1862 1863
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1864 1865 1866 1867 1868 1869 1870 1871
	}
	return err;
}

/*
 *	Shutdown a socket.
 */

1872
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
L
Linus Torvalds 已提交
1873
{
1874
	int err, fput_needed;
L
Linus Torvalds 已提交
1875 1876
	struct socket *sock;

1877 1878
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1879
		err = security_socket_shutdown(sock, how);
1880 1881 1882
		if (!err)
			err = sock->ops->shutdown(sock, how);
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1883 1884 1885 1886
	}
	return err;
}

1887
/* A couple of helpful macros for getting the address of the 32/64 bit
L
Linus Torvalds 已提交
1888 1889 1890 1891 1892 1893
 * 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)

1894 1895 1896 1897 1898
struct used_address {
	struct sockaddr_storage name;
	unsigned int name_len;
};

1899
static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
1900 1901
			 struct msghdr *msg_sys, unsigned flags,
			 struct used_address *used_address)
L
Linus Torvalds 已提交
1902
{
1903 1904
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
1905
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1906
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1907
	unsigned char ctl[sizeof(struct cmsghdr) + 20]
1908 1909
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));
	/* 20 is size of ipv6_pktinfo */
L
Linus Torvalds 已提交
1910 1911
	unsigned char *ctl_buf = ctl;
	int err, ctl_len, iov_size, total_len;
1912

L
Linus Torvalds 已提交
1913 1914
	err = -EFAULT;
	if (MSG_CMSG_COMPAT & flags) {
1915
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
1916
			return -EFAULT;
1917
	} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
L
Linus Torvalds 已提交
1918 1919 1920 1921
		return -EFAULT;

	/* do not move before msg_sys is valid */
	err = -EMSGSIZE;
1922 1923
	if (msg_sys->msg_iovlen > UIO_MAXIOV)
		goto out;
L
Linus Torvalds 已提交
1924

1925
	/* Check whether to allocate the iovec area */
L
Linus Torvalds 已提交
1926
	err = -ENOMEM;
1927 1928
	iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
L
Linus Torvalds 已提交
1929 1930
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
1931
			goto out;
L
Linus Torvalds 已提交
1932 1933 1934 1935
	}

	/* This will also move the address data into kernel space */
	if (MSG_CMSG_COMPAT & flags) {
1936
		err = verify_compat_iovec(msg_sys, iov,
1937 1938
					  (struct sockaddr *)&address,
					  VERIFY_READ);
L
Linus Torvalds 已提交
1939
	} else
1940
		err = verify_iovec(msg_sys, iov,
1941 1942
				   (struct sockaddr *)&address,
				   VERIFY_READ);
1943
	if (err < 0)
L
Linus Torvalds 已提交
1944 1945 1946 1947 1948
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

1949
	if (msg_sys->msg_controllen > INT_MAX)
L
Linus Torvalds 已提交
1950
		goto out_freeiov;
1951
	ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
1952
	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1953
		err =
1954
		    cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
1955
						     sizeof(ctl));
L
Linus Torvalds 已提交
1956 1957
		if (err)
			goto out_freeiov;
1958 1959
		ctl_buf = msg_sys->msg_control;
		ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
1960
	} else if (ctl_len) {
1961
		if (ctl_len > sizeof(ctl)) {
L
Linus Torvalds 已提交
1962
			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1963
			if (ctl_buf == NULL)
L
Linus Torvalds 已提交
1964 1965 1966 1967
				goto out_freeiov;
		}
		err = -EFAULT;
		/*
1968
		 * Careful! Before this, msg_sys->msg_control contains a user pointer.
L
Linus Torvalds 已提交
1969 1970 1971
		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
		 * checking falls down on this.
		 */
1972
		if (copy_from_user(ctl_buf,
1973
				   (void __user __force *)msg_sys->msg_control,
1974
				   ctl_len))
L
Linus Torvalds 已提交
1975
			goto out_freectl;
1976
		msg_sys->msg_control = ctl_buf;
L
Linus Torvalds 已提交
1977
	}
1978
	msg_sys->msg_flags = flags;
L
Linus Torvalds 已提交
1979 1980

	if (sock->file->f_flags & O_NONBLOCK)
1981
		msg_sys->msg_flags |= MSG_DONTWAIT;
1982 1983 1984 1985 1986 1987
	/*
	 * If this is sendmmsg() and current destination address is same as
	 * previously succeeded address, omit asking LSM's decision.
	 * used_address->name_len is initialized to UINT_MAX so that the first
	 * destination address never matches.
	 */
1988 1989 1990
	if (used_address && msg_sys->msg_name &&
	    used_address->name_len == msg_sys->msg_namelen &&
	    !memcmp(&used_address->name, msg_sys->msg_name,
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
		    used_address->name_len)) {
		err = sock_sendmsg_nosec(sock, msg_sys, total_len);
		goto out_freectl;
	}
	err = sock_sendmsg(sock, msg_sys, total_len);
	/*
	 * If this is sendmmsg() and sending to current destination address was
	 * successful, remember it.
	 */
	if (used_address && err >= 0) {
		used_address->name_len = msg_sys->msg_namelen;
2002 2003 2004
		if (msg_sys->msg_name)
			memcpy(&used_address->name, msg_sys->msg_name,
			       used_address->name_len);
2005
	}
L
Linus Torvalds 已提交
2006 2007

out_freectl:
2008
	if (ctl_buf != ctl)
L
Linus Torvalds 已提交
2009 2010 2011 2012
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
out:
	return err;
}

/*
 *	BSD sendmsg interface
 */

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

	if (!sock)
		goto out;

2030
	err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2031

2032
	fput_light(sock->file, fput_needed);
2033
out:
L
Linus Torvalds 已提交
2034 2035 2036
	return err;
}

2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
/*
 *	Linux sendmmsg interface
 */

int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
		   unsigned int flags)
{
	int fput_needed, err, datagrams;
	struct socket *sock;
	struct mmsghdr __user *entry;
	struct compat_mmsghdr __user *compat_entry;
	struct msghdr msg_sys;
2049
	struct used_address used_address;
2050

2051 2052
	if (vlen > UIO_MAXIOV)
		vlen = UIO_MAXIOV;
2053 2054 2055 2056 2057 2058 2059

	datagrams = 0;

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

2060
	used_address.name_len = UINT_MAX;
2061 2062
	entry = mmsg;
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2063
	err = 0;
2064 2065 2066 2067

	while (datagrams < vlen) {
		if (MSG_CMSG_COMPAT & flags) {
			err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2068
					    &msg_sys, flags, &used_address);
2069 2070 2071 2072 2073 2074
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
			err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
2075
					    &msg_sys, flags, &used_address);
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

		if (err)
			break;
		++datagrams;
	}

	fput_light(sock->file, fput_needed);

2089 2090
	/* We only return an error if no datagrams were able to be sent */
	if (datagrams != 0)
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101
		return datagrams;

	return err;
}

SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
		unsigned int, vlen, unsigned int, flags)
{
	return __sys_sendmmsg(fd, mmsg, vlen, flags);
}

2102 2103
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
2104
{
2105 2106
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
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2107
	struct iovec iovstack[UIO_FASTIOV];
2108
	struct iovec *iov = iovstack;
L
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2109 2110 2111 2112
	unsigned long cmsg_ptr;
	int err, iov_size, total_len, len;

	/* kernel mode address */
2113
	struct sockaddr_storage addr;
L
Linus Torvalds 已提交
2114 2115 2116 2117

	/* user mode address pointers */
	struct sockaddr __user *uaddr;
	int __user *uaddr_len;
2118

L
Linus Torvalds 已提交
2119
	if (MSG_CMSG_COMPAT & flags) {
2120
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
2121
			return -EFAULT;
2122
	} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
2123
		return -EFAULT;
L
Linus Torvalds 已提交
2124 2125

	err = -EMSGSIZE;
2126 2127
	if (msg_sys->msg_iovlen > UIO_MAXIOV)
		goto out;
2128 2129

	/* Check whether to allocate the iovec area */
L
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2130
	err = -ENOMEM;
2131 2132
	iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
L
Linus Torvalds 已提交
2133 2134
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
2135
			goto out;
L
Linus Torvalds 已提交
2136 2137 2138
	}

	/*
2139 2140
	 *      Save the user-mode address (verify_iovec will change the
	 *      kernel msghdr to use the kernel address space)
L
Linus Torvalds 已提交
2141
	 */
2142

2143
	uaddr = (__force void __user *)msg_sys->msg_name;
L
Linus Torvalds 已提交
2144 2145
	uaddr_len = COMPAT_NAMELEN(msg);
	if (MSG_CMSG_COMPAT & flags) {
2146
		err = verify_compat_iovec(msg_sys, iov,
2147 2148
					  (struct sockaddr *)&addr,
					  VERIFY_WRITE);
L
Linus Torvalds 已提交
2149
	} else
2150
		err = verify_iovec(msg_sys, iov,
2151 2152
				   (struct sockaddr *)&addr,
				   VERIFY_WRITE);
L
Linus Torvalds 已提交
2153 2154
	if (err < 0)
		goto out_freeiov;
2155
	total_len = err;
L
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2156

2157 2158
	cmsg_ptr = (unsigned long)msg_sys->msg_control;
	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2159

L
Linus Torvalds 已提交
2160 2161
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
2162 2163
	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
							  total_len, flags);
L
Linus Torvalds 已提交
2164 2165 2166 2167 2168
	if (err < 0)
		goto out_freeiov;
	len = err;

	if (uaddr != NULL) {
2169
		err = move_addr_to_user((struct sockaddr *)&addr,
2170
					msg_sys->msg_namelen, uaddr,
2171
					uaddr_len);
L
Linus Torvalds 已提交
2172 2173 2174
		if (err < 0)
			goto out_freeiov;
	}
2175
	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2176
			 COMPAT_FLAGS(msg));
L
Linus Torvalds 已提交
2177 2178 2179
	if (err)
		goto out_freeiov;
	if (MSG_CMSG_COMPAT & flags)
2180
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2181 2182
				 &msg_compat->msg_controllen);
	else
2183
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2184 2185 2186 2187 2188 2189 2190 2191
				 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211
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);

2212
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
2213 2214 2215 2216
out:
	return err;
}

2217 2218 2219 2220 2221 2222 2223 2224 2225 2226
/*
 *     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;
2227
	struct compat_mmsghdr __user *compat_entry;
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
	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;
2247
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2248 2249 2250 2251 2252

	while (datagrams < vlen) {
		/*
		 * No need to ask LSM for more than the first datagram.
		 */
2253 2254
		if (MSG_CMSG_COMPAT & flags) {
			err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2255 2256
					    &msg_sys, flags & ~MSG_WAITFORONE,
					    datagrams);
2257 2258 2259 2260 2261 2262
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
			err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2263 2264
					    &msg_sys, flags & ~MSG_WAITFORONE,
					    datagrams);
2265 2266 2267 2268 2269 2270
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

2271 2272 2273 2274
		if (err)
			break;
		++datagrams;

2275 2276 2277 2278
		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
		if (flags & MSG_WAITFORONE)
			flags |= MSG_DONTWAIT;

2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298
		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
Linus Torvalds 已提交
2299

2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
	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
2347 2348
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
2349
static const unsigned char nargs[21] = {
2350 2351 2352
	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),
2353
	AL(4), AL(5), AL(4)
2354 2355
};

L
Linus Torvalds 已提交
2356 2357 2358
#undef AL

/*
2359
 *	System call vectors.
L
Linus Torvalds 已提交
2360 2361 2362
 *
 *	Argument checking cleaned up. Saved 20% in size.
 *  This function doesn't need to set the kernel lock because
2363
 *  it is set by the callees.
L
Linus Torvalds 已提交
2364 2365
 */

2366
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
L
Linus Torvalds 已提交
2367 2368
{
	unsigned long a[6];
2369
	unsigned long a0, a1;
L
Linus Torvalds 已提交
2370
	int err;
2371
	unsigned int len;
L
Linus Torvalds 已提交
2372

2373
	if (call < 1 || call > SYS_SENDMMSG)
L
Linus Torvalds 已提交
2374 2375
		return -EINVAL;

2376 2377 2378 2379
	len = nargs[call];
	if (len > sizeof(a))
		return -EINVAL;

L
Linus Torvalds 已提交
2380
	/* copy_from_user should be SMP safe. */
2381
	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
2382
		return -EFAULT;
2383

A
Al Viro 已提交
2384
	audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2385

2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402
	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
2403 2404
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], 0);
2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447
		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;
2448 2449 2450
	case SYS_SENDMMSG:
		err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
		break;
2451 2452 2453
	case SYS_RECVMSG:
		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
2454 2455 2456 2457
	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
2458 2459 2460
	case SYS_ACCEPT4:
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], a[3]);
U
Ulrich Drepper 已提交
2461
		break;
2462 2463 2464
	default:
		err = -EINVAL;
		break;
L
Linus Torvalds 已提交
2465 2466 2467 2468
	}
	return err;
}

2469
#endif				/* __ARCH_WANT_SYS_SOCKETCALL */
L
Linus Torvalds 已提交
2470

2471 2472 2473 2474
/**
 *	sock_register - add a socket protocol handler
 *	@ops: description of protocol
 *
L
Linus Torvalds 已提交
2475 2476
 *	This function is called by a protocol handler that wants to
 *	advertise its address family, and have it linked into the
2477 2478
 *	socket interface. The value ops->family coresponds to the
 *	socket system call protocol family.
L
Linus Torvalds 已提交
2479
 */
2480
int sock_register(const struct net_proto_family *ops)
L
Linus Torvalds 已提交
2481 2482 2483 2484
{
	int err;

	if (ops->family >= NPROTO) {
2485 2486
		printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
		       NPROTO);
L
Linus Torvalds 已提交
2487 2488
		return -ENOBUFS;
	}
2489 2490

	spin_lock(&net_family_lock);
E
Eric Dumazet 已提交
2491 2492
	if (rcu_dereference_protected(net_families[ops->family],
				      lockdep_is_held(&net_family_lock)))
2493 2494
		err = -EEXIST;
	else {
2495
		RCU_INIT_POINTER(net_families[ops->family], ops);
L
Linus Torvalds 已提交
2496 2497
		err = 0;
	}
2498 2499
	spin_unlock(&net_family_lock);

2500
	printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
L
Linus Torvalds 已提交
2501 2502
	return err;
}
2503
EXPORT_SYMBOL(sock_register);
L
Linus Torvalds 已提交
2504

2505 2506 2507 2508
/**
 *	sock_unregister - remove a protocol handler
 *	@family: protocol family to remove
 *
L
Linus Torvalds 已提交
2509 2510
 *	This function is called by a protocol handler that wants to
 *	remove its address family, and have it unlinked from the
2511 2512 2513 2514 2515 2516
 *	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
2517
 */
2518
void sock_unregister(int family)
L
Linus Torvalds 已提交
2519
{
2520
	BUG_ON(family < 0 || family >= NPROTO);
L
Linus Torvalds 已提交
2521

2522
	spin_lock(&net_family_lock);
2523
	RCU_INIT_POINTER(net_families[family], NULL);
2524 2525 2526 2527
	spin_unlock(&net_family_lock);

	synchronize_rcu();

2528
	printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
L
Linus Torvalds 已提交
2529
}
2530
EXPORT_SYMBOL(sock_unregister);
L
Linus Torvalds 已提交
2531

2532
static int __init sock_init(void)
L
Linus Torvalds 已提交
2533
{
N
Nick Piggin 已提交
2534 2535
	int err;

L
Linus Torvalds 已提交
2536
	/*
2537
	 *      Initialize sock SLAB cache.
L
Linus Torvalds 已提交
2538
	 */
2539

L
Linus Torvalds 已提交
2540 2541 2542
	sk_init();

	/*
2543
	 *      Initialize skbuff SLAB cache
L
Linus Torvalds 已提交
2544 2545 2546 2547
	 */
	skb_init();

	/*
2548
	 *      Initialize the protocols module.
L
Linus Torvalds 已提交
2549 2550 2551
	 */

	init_inodecache();
N
Nick Piggin 已提交
2552 2553 2554 2555

	err = register_filesystem(&sock_fs_type);
	if (err)
		goto out_fs;
L
Linus Torvalds 已提交
2556
	sock_mnt = kern_mount(&sock_fs_type);
N
Nick Piggin 已提交
2557 2558 2559 2560
	if (IS_ERR(sock_mnt)) {
		err = PTR_ERR(sock_mnt);
		goto out_mount;
	}
2561 2562

	/* The real protocol initialization is performed in later initcalls.
L
Linus Torvalds 已提交
2563 2564 2565 2566 2567
	 */

#ifdef CONFIG_NETFILTER
	netfilter_init();
#endif
2568

2569 2570 2571 2572
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
	skb_timestamping_init();
#endif

N
Nick Piggin 已提交
2573 2574 2575 2576 2577 2578 2579
out:
	return err;

out_mount:
	unregister_filesystem(&sock_fs_type);
out_fs:
	goto out;
L
Linus Torvalds 已提交
2580 2581
}

2582 2583
core_initcall(sock_init);	/* early initcall */

L
Linus Torvalds 已提交
2584 2585 2586 2587 2588 2589
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
	int cpu;
	int counter = 0;

2590
	for_each_possible_cpu(cpu)
2591
	    counter += per_cpu(sockets_in_use, cpu);
L
Linus Torvalds 已提交
2592 2593 2594 2595 2596 2597 2598

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

	seq_printf(seq, "sockets: used %d\n", counter);
}
2599
#endif				/* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2600

2601
#ifdef CONFIG_COMPAT
2602 2603
static int do_siocgstamp(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_timeval __user *up)
2604 2605 2606 2607 2608 2609
{
	mm_segment_t old_fs = get_fs();
	struct timeval ktv;
	int err;

	set_fs(KERNEL_DS);
2610
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2611 2612 2613 2614 2615 2616 2617 2618
	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;
}

2619 2620
static int do_siocgstampns(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_timespec __user *up)
2621 2622 2623 2624 2625 2626
{
	mm_segment_t old_fs = get_fs();
	struct timespec kts;
	int err;

	set_fs(KERNEL_DS);
2627
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2628 2629 2630 2631 2632 2633 2634 2635
	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;
}

2636
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2637 2638 2639 2640 2641
{
	struct ifreq __user *uifr;
	int err;

	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2642
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2643 2644
		return -EFAULT;

2645
	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2646 2647 2648
	if (err)
		return err;

2649
	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2650 2651 2652 2653 2654
		return -EFAULT;

	return 0;
}

2655
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2656
{
2657
	struct compat_ifconf ifc32;
2658 2659
	struct ifconf ifc;
	struct ifconf __user *uifc;
2660
	struct compat_ifreq __user *ifr32;
2661 2662 2663 2664
	struct ifreq __user *ifr;
	unsigned int i, j;
	int err;

2665
	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2666 2667 2668 2669 2670 2671 2672 2673
		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 {
2674 2675
		size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
			sizeof(struct ifreq);
2676 2677 2678 2679
		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);
2680
		for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2681
			if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2682 2683 2684 2685 2686 2687 2688 2689
				return -EFAULT;
			ifr++;
			ifr32++;
		}
	}
	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
		return -EFAULT;

2690
	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2691 2692 2693 2694 2695 2696 2697 2698 2699
	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;
2700 2701 2702
	     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)))
2703 2704 2705 2706 2707 2708 2709 2710 2711 2712
			return -EFAULT;
		ifr32++;
		ifr++;
	}

	if (ifc32.ifcbuf == 0) {
		/* Translate from 64-bit structure multiple to
		 * a 32-bit one.
		 */
		i = ifc.ifc_len;
2713
		i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2714 2715 2716 2717
		ifc32.ifc_len = i;
	} else {
		ifc32.ifc_len = i;
	}
2718
	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2719 2720 2721 2722 2723
		return -EFAULT;

	return 0;
}

2724
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2725
{
2726 2727 2728 2729
	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;
2730
	struct ifreq __user *ifr;
2731 2732
	u32 rule_cnt = 0, actual_rule_cnt;
	u32 ethcmd;
2733
	u32 data;
2734
	int ret;
2735

2736 2737
	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
		return -EFAULT;
2738

2739 2740 2741
	compat_rxnfc = compat_ptr(data);

	if (get_user(ethcmd, &compat_rxnfc->cmd))
2742 2743
		return -EFAULT;

2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760
	/* 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:
2761
	case ETHTOOL_SRXCLSRLINS:
2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773
		convert_out = true;
		/* fall through */
	case ETHTOOL_SRXCLSRLDEL:
		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))
2774 2775
		return -EFAULT;

2776 2777
	if (put_user(convert_in ? rxnfc : compat_ptr(data),
		     &ifr->ifr_ifru.ifru_data))
2778 2779
		return -EFAULT;

2780
	if (convert_in) {
2781
		/* We expect there to be holes between fs.m_ext and
2782 2783
		 * fs.ring_cookie and at the end of fs, but nowhere else.
		 */
2784 2785 2786 2787
		BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
			     sizeof(compat_rxnfc->fs.m_ext) !=
			     offsetof(struct ethtool_rxnfc, fs.m_ext) +
			     sizeof(rxnfc->fs.m_ext));
2788 2789 2790 2791 2792 2793 2794
		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,
2795
				 (void *)(&rxnfc->fs.m_ext + 1) -
2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811
				 (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,
2812
				 (const void *)(&rxnfc->fs.m_ext + 1) -
2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842
				 (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;
2843 2844
}

2845 2846 2847 2848 2849 2850
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2851
	uifr = compat_alloc_user_space(sizeof(*uifr));
2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865
	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);
}

2866 2867
static int bond_ioctl(struct net *net, unsigned int cmd,
			 struct compat_ifreq __user *ifr32)
2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880
{
	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:
2881
		if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2882 2883 2884
			return -EFAULT;

		old_fs = get_fs();
2885
		set_fs(KERNEL_DS);
2886 2887
		err = dev_ioctl(net, cmd,
				(struct ifreq __user __force *) &kifr);
2888
		set_fs(old_fs);
2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903

		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;

2904
		return dev_ioctl(net, cmd, uifr);
2905
	default:
2906
		return -ENOIOCTLCMD;
2907
	}
2908 2909
}

2910 2911
static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
				 struct compat_ifreq __user *u_ifreq32)
2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935
{
	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;

2936
	return dev_ioctl(net, cmd, u_ifreq64);
2937 2938
}

2939 2940
static int dev_ifsioc(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_ifreq __user *uifr32)
2941
{
2942
	struct ifreq __user *uifr;
2943 2944
	int err;

2945 2946 2947 2948 2949 2950
	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);

2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962
	if (!err) {
		switch (cmd) {
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFINDEX:
		case SIOCGIFADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFNETMASK:
2963
		case SIOCGIFPFLAGS:
2964
		case SIOCGIFTXQLEN:
2965 2966
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
2967
			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2968 2969 2970 2971 2972 2973 2974
				err = -EFAULT;
			break;
		}
	}
	return err;
}

2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994
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();
2995
	set_fs(KERNEL_DS);
2996
	err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
2997
	set_fs(old_fs);
2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018

	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;

3019
	uifr = compat_alloc_user_space(sizeof(*uifr));
3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033
	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);
}

3034
struct rtentry32 {
3035
	u32		rt_pad1;
3036 3037 3038
	struct sockaddr rt_dst;         /* target address               */
	struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
	struct sockaddr rt_genmask;     /* target network mask (IP)     */
3039 3040 3041 3042 3043 3044 3045
	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! */
3046
	/* char * */ u32 rt_dev;        /* forcing the device at add    */
3047 3048
	u32		rt_mtu;         /* per route MTU/Window         */
	u32		rt_window;      /* Window clamping              */
3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064
	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;
};

3065 3066
static int routing_ioctl(struct net *net, struct socket *sock,
			 unsigned int cmd, void __user *argp)
3067 3068 3069 3070 3071 3072 3073 3074 3075
{
	int ret;
	void *r = NULL;
	struct in6_rtmsg r6;
	struct rtentry r4;
	char devname[16];
	u32 rtdev;
	mm_segment_t old_fs = get_fs();

3076 3077
	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
		struct in6_rtmsg32 __user *ur6 = argp;
3078
		ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3079
			3 * sizeof(struct in6_addr));
3080 3081 3082 3083 3084 3085 3086
		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));
3087 3088 3089

		r = (void *) &r6;
	} else { /* ipv4 */
3090
		struct rtentry32 __user *ur4 = argp;
3091
		ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3092
					3 * sizeof(struct sockaddr));
3093 3094 3095 3096 3097 3098
		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));
3099
		if (rtdev) {
3100
			ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3101 3102
			r4.rt_dev = (char __user __force *)devname;
			devname[15] = 0;
3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113
		} else
			r4.rt_dev = NULL;

		r = (void *) &r4;
	}

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

3114
	set_fs(KERNEL_DS);
3115
	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3116
	set_fs(old_fs);
3117 3118 3119 3120 3121 3122 3123

out:
	return ret;
}

/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
 * for some operations; this forces use of the newer bridge-utils that
L
Lucas De Marchi 已提交
3124
 * use compatible ioctls
3125
 */
3126
static int old_bridge_ioctl(compat_ulong_t __user *argp)
3127
{
3128
	compat_ulong_t tmp;
3129

3130
	if (get_user(tmp, argp))
3131 3132 3133 3134 3135 3136
		return -EFAULT;
	if (tmp == BRCTL_GET_VERSION)
		return BRCTL_VERSION + 1;
	return -EINVAL;
}

3137 3138 3139 3140 3141 3142
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);
3143

3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156
	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);
3157 3158
	case SIOCWANDEV:
		return compat_siocwandev(net, argp);
3159 3160 3161
	case SIOCGIFMAP:
	case SIOCSIFMAP:
		return compat_sioc_ifmap(net, cmd, argp);
3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
	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);
3176 3177
	case SIOCSHWTSTAMP:
		return compat_siocshwtstamp(net, argp);
3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219

	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:
3220 3221 3222 3223
	case SIOCSIFNAME:
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
3224
		return dev_ifsioc(net, sock, cmd, argp);
3225

3226 3227 3228 3229
	case SIOCSARP:
	case SIOCGARP:
	case SIOCDARP:
	case SIOCATMARK:
3230 3231 3232
		return sock_do_ioctl(net, sock, cmd, arg);
	}

3233 3234
	return -ENOIOCTLCMD;
}
3235

3236
static long compat_sock_ioctl(struct file *file, unsigned cmd,
3237
			      unsigned long arg)
3238 3239 3240
{
	struct socket *sock = file->private_data;
	int ret = -ENOIOCTLCMD;
3241 3242 3243 3244 3245
	struct sock *sk;
	struct net *net;

	sk = sock->sk;
	net = sock_net(sk);
3246 3247 3248 3249

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

3250 3251 3252 3253
	if (ret == -ENOIOCTLCMD &&
	    (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
		ret = compat_wext_handle_ioctl(net, cmd, arg);

3254 3255 3256
	if (ret == -ENOIOCTLCMD)
		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);

3257 3258 3259 3260
	return ret;
}
#endif

3261 3262 3263 3264
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
	return sock->ops->bind(sock, addr, addrlen);
}
3265
EXPORT_SYMBOL(kernel_bind);
3266 3267 3268 3269 3270

int kernel_listen(struct socket *sock, int backlog)
{
	return sock->ops->listen(sock, backlog);
}
3271
EXPORT_SYMBOL(kernel_listen);
3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285

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);
3286
		*newsock = NULL;
3287 3288 3289 3290
		goto done;
	}

	(*newsock)->ops = sock->ops;
3291
	__module_get((*newsock)->ops->owner);
3292 3293 3294 3295

done:
	return err;
}
3296
EXPORT_SYMBOL(kernel_accept);
3297 3298

int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3299
		   int flags)
3300 3301 3302
{
	return sock->ops->connect(sock, addr, addrlen, flags);
}
3303
EXPORT_SYMBOL(kernel_connect);
3304 3305 3306 3307 3308 3309

int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 0);
}
3310
EXPORT_SYMBOL(kernel_getsockname);
3311 3312 3313 3314 3315 3316

int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 1);
}
3317
EXPORT_SYMBOL(kernel_getpeername);
3318 3319 3320 3321 3322

int kernel_getsockopt(struct socket *sock, int level, int optname,
			char *optval, int *optlen)
{
	mm_segment_t oldfs = get_fs();
3323 3324
	char __user *uoptval;
	int __user *uoptlen;
3325 3326
	int err;

3327 3328 3329
	uoptval = (char __user __force *) optval;
	uoptlen = (int __user __force *) optlen;

3330 3331
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3332
		err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3333
	else
3334 3335
		err = sock->ops->getsockopt(sock, level, optname, uoptval,
					    uoptlen);
3336 3337 3338
	set_fs(oldfs);
	return err;
}
3339
EXPORT_SYMBOL(kernel_getsockopt);
3340 3341

int kernel_setsockopt(struct socket *sock, int level, int optname,
3342
			char *optval, unsigned int optlen)
3343 3344
{
	mm_segment_t oldfs = get_fs();
3345
	char __user *uoptval;
3346 3347
	int err;

3348 3349
	uoptval = (char __user __force *) optval;

3350 3351
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3352
		err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3353
	else
3354
		err = sock->ops->setsockopt(sock, level, optname, uoptval,
3355 3356 3357 3358
					    optlen);
	set_fs(oldfs);
	return err;
}
3359
EXPORT_SYMBOL(kernel_setsockopt);
3360 3361 3362 3363

int kernel_sendpage(struct socket *sock, struct page *page, int offset,
		    size_t size, int flags)
{
3364 3365
	sock_update_classid(sock->sk);

3366 3367 3368 3369 3370
	if (sock->ops->sendpage)
		return sock->ops->sendpage(sock, page, offset, size, flags);

	return sock_no_sendpage(sock, page, offset, size, flags);
}
3371
EXPORT_SYMBOL(kernel_sendpage);
3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383

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;
}
3384
EXPORT_SYMBOL(kernel_sock_ioctl);
3385

3386 3387 3388 3389 3390
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
	return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);