socket.c 83.3 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/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 <linux/xattr.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_storage *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_storage *kaddr, int klen,
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			     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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struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
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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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	if (dname) {
		name.name = dname;
		name.len = strlen(name.name);
	} else if (sock->sk) {
		name.name = sock->sk->sk_prot_creator->name;
		name.len = strlen(name.name);
	}
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	path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
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	if (unlikely(!path.dentry))
		return ERR_PTR(-ENOMEM);
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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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		return ERR_PTR(-ENFILE);
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	}

	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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	return file;
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}
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EXPORT_SYMBOL(sock_alloc_file);
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static int sock_map_fd(struct socket *sock, int flags)
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{
	struct file *newfile;
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	int fd = get_unused_fd_flags(flags);
	if (unlikely(fd < 0))
		return fd;
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	newfile = sock_alloc_file(sock, flags, NULL);
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	if (likely(!IS_ERR(newfile))) {
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		fd_install(fd, newfile);
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		return fd;
	}
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	put_unused_fd(fd);
	return PTR_ERR(newfile);
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}

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struct socket *sock_from_file(struct file *file, int *err)
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{
	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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EXPORT_SYMBOL(sock_from_file);
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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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}

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#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
static ssize_t sockfs_getxattr(struct dentry *dentry,
			       const char *name, void *value, size_t size)
{
	const char *proto_name;
	size_t proto_size;
	int error;

	error = -ENODATA;
	if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
		proto_name = dentry->d_name.name;
		proto_size = strlen(proto_name);

		if (value) {
			error = -ERANGE;
			if (proto_size + 1 > size)
				goto out;

			strncpy(value, proto_name, proto_size + 1);
		}
		error = proto_size + 1;
	}

out:
	return error;
}

static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
				size_t size)
{
	ssize_t len;
	ssize_t used = 0;

	len = security_inode_listsecurity(dentry->d_inode, buffer, size);
	if (len < 0)
		return len;
	used += len;
	if (buffer) {
		if (size < used)
			return -ERANGE;
		buffer += len;
	}

	len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
	used += len;
	if (buffer) {
		if (size < used)
			return -ERANGE;
		memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
		buffer += len;
	}

	return used;
}

static const struct inode_operations sockfs_inode_ops = {
	.getxattr = sockfs_getxattr,
	.listxattr = sockfs_listxattr,
};

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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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	inode->i_op = &sockfs_inode_ops;
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	this_cpu_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
576
 *	an inode not a file.
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 */
578

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579 580 581 582 583 584 585 586 587 588
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);
	}

589
	if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
L
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590 591
		printk(KERN_ERR "sock_release: fasync list not empty!\n");

592 593 594
	if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
		return;

595
	this_cpu_sub(sockets_in_use, 1);
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Linus Torvalds 已提交
596 597 598 599
	if (!sock->file) {
		iput(SOCK_INODE(sock));
		return;
	}
600
	sock->file = NULL;
L
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601
}
602
EXPORT_SYMBOL(sock_release);
L
Linus Torvalds 已提交
603

604
int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
605
{
606
	*tx_flags = 0;
607
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
608
		*tx_flags |= SKBTX_HW_TSTAMP;
609
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
610
		*tx_flags |= SKBTX_SW_TSTAMP;
611 612
	if (sock_flag(sk, SOCK_WIFI_STATUS))
		*tx_flags |= SKBTX_WIFI_STATUS;
613 614 615 616
	return 0;
}
EXPORT_SYMBOL(sock_tx_timestamp);

617 618
static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
				       struct msghdr *msg, size_t size)
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Linus Torvalds 已提交
619 620 621 622 623 624 625 626 627 628 629
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);

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

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

630 631 632 633 634 635 636 637
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);
}

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638 639 640 641 642 643 644 645 646 647 648 649 650
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;
}
651
EXPORT_SYMBOL(sock_sendmsg);
L
Linus Torvalds 已提交
652

653
static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
654 655 656 657 658 659 660 661 662 663 664 665 666
{
	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;
}

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667 668 669 670 671 672 673 674 675 676 677
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
	 */
678
	msg->msg_iov = (struct iovec *)vec;
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679 680 681 682 683
	msg->msg_iovlen = num;
	result = sock_sendmsg(sock, msg, size);
	set_fs(oldfs);
	return result;
}
684
EXPORT_SYMBOL(kernel_sendmsg);
L
Linus Torvalds 已提交
685

686 687 688 689 690 691 692 693 694 695
static int ktime2ts(ktime_t kt, struct timespec *ts)
{
	if (kt.tv64) {
		*ts = ktime_to_timespec(kt);
		return 1;
	} else {
		return 0;
	}
}

696 697 698 699 700 701
/*
 * 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)
{
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
	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 {
720
			skb_get_timestampns(skb, &ts[0]);
721
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
722
				 sizeof(ts[0]), &ts[0]);
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
		}
	}


	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;
740
	}
741 742 743
	if (!empty)
		put_cmsg(msg, SOL_SOCKET,
			 SCM_TIMESTAMPING, sizeof(ts), &ts);
744
}
745 746
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);

747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
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
763 764
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
				   struct sk_buff *skb)
765 766 767 768 769 770
{
	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
		put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
			sizeof(__u32), &skb->dropcount);
}

771
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
772 773 774 775 776
	struct sk_buff *skb)
{
	sock_recv_timestamp(msg, sk, skb);
	sock_recv_drops(msg, sk, skb);
}
777
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
778

779 780
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
781 782 783 784 785 786 787 788 789 790 791 792
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);

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

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

793 794 795 796 797 798 799 800
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);
}

801
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
L
Linus Torvalds 已提交
802 803 804 805 806 807
		 size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

808
	init_sync_kiocb(&iocb, NULL);
L
Linus Torvalds 已提交
809 810 811 812 813 814
	iocb.private = &siocb;
	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
815
EXPORT_SYMBOL(sock_recvmsg);
L
Linus Torvalds 已提交
816

817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
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;
}

832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
/**
 * 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.
 */
847 848
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
849 850 851 852 853 854 855 856 857
{
	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
	 */
858
	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
L
Linus Torvalds 已提交
859 860 861 862
	result = sock_recvmsg(sock, msg, size, flags);
	set_fs(oldfs);
	return result;
}
863
EXPORT_SYMBOL(kernel_recvmsg);
L
Linus Torvalds 已提交
864 865 866 867 868 869

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

870 871
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
872 873 874 875
{
	struct socket *sock;
	int flags;

876 877
	sock = file->private_data;

878 879 880
	flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
	/* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
	flags |= more;
881

882
	return kernel_sendpage(sock, page, offset, size, flags);
883
}
L
Linus Torvalds 已提交
884

J
Jens Axboe 已提交
885
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
886
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
887 888 889 890
				unsigned int flags)
{
	struct socket *sock = file->private_data;

891 892 893
	if (unlikely(!sock->ops->splice_read))
		return -EINVAL;

J
Jens Axboe 已提交
894 895 896
	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}

897
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
898
					 struct sock_iocb *siocb)
899 900 901 902 903
{
	if (!is_sync_kiocb(iocb)) {
		siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
		if (!siocb)
			return NULL;
L
Linus Torvalds 已提交
904 905 906
		iocb->ki_dtor = sock_aio_dtor;
	}

907 908 909
	siocb->kiocb = iocb;
	iocb->private = siocb;
	return siocb;
L
Linus Torvalds 已提交
910 911
}

912
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
913 914
		struct file *file, const struct iovec *iov,
		unsigned long nr_segs)
915 916 917 918
{
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
919

920 921
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
922

923 924 925 926
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
927
	msg->msg_iov = (struct iovec *)iov;
928 929 930 931 932 933
	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);
}

934 935
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
936 937 938
{
	struct sock_iocb siocb, *x;

L
Linus Torvalds 已提交
939 940
	if (pos != 0)
		return -ESPIPE;
941 942

	if (iocb->ki_left == 0)	/* Match SYS5 behaviour */
L
Linus Torvalds 已提交
943 944
		return 0;

945 946

	x = alloc_sock_iocb(iocb, &siocb);
947 948
	if (!x)
		return -ENOMEM;
949
	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
950 951
}

952
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
953 954
			struct file *file, const struct iovec *iov,
			unsigned long nr_segs)
L
Linus Torvalds 已提交
955
{
956 957 958
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
959

960 961
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
962

963 964 965 966
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
967
	msg->msg_iov = (struct iovec *)iov;
968 969 970 971
	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
972

973
	return __sock_sendmsg(iocb, sock, msg, size);
L
Linus Torvalds 已提交
974 975
}

976 977
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos)
978 979
{
	struct sock_iocb siocb, *x;
L
Linus Torvalds 已提交
980

981 982
	if (pos != 0)
		return -ESPIPE;
983 984

	x = alloc_sock_iocb(iocb, &siocb);
985 986
	if (!x)
		return -ENOMEM;
L
Linus Torvalds 已提交
987

988
	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
989 990 991 992 993 994 995
}

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

A
Arjan van de Ven 已提交
996
static DEFINE_MUTEX(br_ioctl_mutex);
997
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
L
Linus Torvalds 已提交
998

999
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
L
Linus Torvalds 已提交
1000
{
A
Arjan van de Ven 已提交
1001
	mutex_lock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1002
	br_ioctl_hook = hook;
A
Arjan van de Ven 已提交
1003
	mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1004 1005 1006
}
EXPORT_SYMBOL(brioctl_set);

A
Arjan van de Ven 已提交
1007
static DEFINE_MUTEX(vlan_ioctl_mutex);
1008
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
L
Linus Torvalds 已提交
1009

1010
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
L
Linus Torvalds 已提交
1011
{
A
Arjan van de Ven 已提交
1012
	mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1013
	vlan_ioctl_hook = hook;
A
Arjan van de Ven 已提交
1014
	mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1015 1016 1017
}
EXPORT_SYMBOL(vlan_ioctl_set);

A
Arjan van de Ven 已提交
1018
static DEFINE_MUTEX(dlci_ioctl_mutex);
1019
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
L
Linus Torvalds 已提交
1020

1021
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
L
Linus Torvalds 已提交
1022
{
A
Arjan van de Ven 已提交
1023
	mutex_lock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1024
	dlci_ioctl_hook = hook;
A
Arjan van de Ven 已提交
1025
	mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1026 1027 1028
}
EXPORT_SYMBOL(dlci_ioctl_set);

1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
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
1047 1048 1049 1050 1051 1052 1053 1054
/*
 *	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;
1055
	struct sock *sk;
L
Linus Torvalds 已提交
1056 1057
	void __user *argp = (void __user *)arg;
	int pid, err;
1058
	struct net *net;
L
Linus Torvalds 已提交
1059

1060
	sock = file->private_data;
1061
	sk = sock->sk;
1062
	net = sock_net(sk);
L
Linus Torvalds 已提交
1063
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1064
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1065
	} else
J
Johannes Berg 已提交
1066
#ifdef CONFIG_WEXT_CORE
L
Linus Torvalds 已提交
1067
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1068
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1069
	} else
J
Johannes Berg 已提交
1070
#endif
1071
		switch (cmd) {
L
Linus Torvalds 已提交
1072 1073 1074 1075 1076 1077 1078 1079 1080
		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:
1081
			err = put_user(f_getown(sock->file),
1082
				       (int __user *)argp);
L
Linus Torvalds 已提交
1083 1084 1085 1086 1087 1088 1089 1090 1091
			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
1092
			mutex_lock(&br_ioctl_mutex);
1093
			if (br_ioctl_hook)
1094
				err = br_ioctl_hook(net, cmd, argp);
A
Arjan van de Ven 已提交
1095
			mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100 1101 1102
			break;
		case SIOCGIFVLAN:
		case SIOCSIFVLAN:
			err = -ENOPKG;
			if (!vlan_ioctl_hook)
				request_module("8021q");

A
Arjan van de Ven 已提交
1103
			mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1104
			if (vlan_ioctl_hook)
1105
				err = vlan_ioctl_hook(net, argp);
A
Arjan van de Ven 已提交
1106
			mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1107 1108 1109 1110 1111 1112 1113
			break;
		case SIOCADDDLCI:
		case SIOCDELDLCI:
			err = -ENOPKG;
			if (!dlci_ioctl_hook)
				request_module("dlci");

1114 1115
			mutex_lock(&dlci_ioctl_mutex);
			if (dlci_ioctl_hook)
L
Linus Torvalds 已提交
1116
				err = dlci_ioctl_hook(cmd, argp);
1117
			mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1118 1119
			break;
		default:
1120
			err = sock_do_ioctl(net, sock, cmd, arg);
L
Linus Torvalds 已提交
1121
			break;
1122
		}
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128 1129
	return err;
}

int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
	int err;
	struct socket *sock = NULL;
1130

L
Linus Torvalds 已提交
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
	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
1142 1143 1144 1145
	err = security_socket_post_create(sock, family, type, protocol, 1);
	if (err)
		goto out_release;

L
Linus Torvalds 已提交
1146 1147 1148
out:
	*res = sock;
	return err;
V
Venkat Yekkirala 已提交
1149 1150 1151 1152
out_release:
	sock_release(sock);
	sock = NULL;
	goto out;
L
Linus Torvalds 已提交
1153
}
1154
EXPORT_SYMBOL(sock_create_lite);
L
Linus Torvalds 已提交
1155 1156

/* No kernel lock held - perfect */
1157
static unsigned int sock_poll(struct file *file, poll_table *wait)
L
Linus Torvalds 已提交
1158 1159 1160 1161
{
	struct socket *sock;

	/*
1162
	 *      We can't return errors to poll, so it's either yes or no.
L
Linus Torvalds 已提交
1163
	 */
1164
	sock = file->private_data;
L
Linus Torvalds 已提交
1165 1166 1167
	return sock->ops->poll(file, sock, wait);
}

1168
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1169
{
1170
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
1171 1172 1173 1174

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

1175
static int sock_close(struct inode *inode, struct file *filp)
L
Linus Torvalds 已提交
1176 1177
{
	/*
1178 1179
	 *      It was possible the inode is NULL we were
	 *      closing an unfinished socket.
L
Linus Torvalds 已提交
1180 1181
	 */

1182
	if (!inode) {
L
Linus Torvalds 已提交
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
		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)
1198
 *	   or under socket lock
L
Linus Torvalds 已提交
1199 1200 1201 1202
 */

static int sock_fasync(int fd, struct file *filp, int on)
{
1203 1204
	struct socket *sock = filp->private_data;
	struct sock *sk = sock->sk;
1205
	struct socket_wq *wq;
L
Linus Torvalds 已提交
1206

1207
	if (sk == NULL)
L
Linus Torvalds 已提交
1208 1209 1210
		return -EINVAL;

	lock_sock(sk);
1211 1212
	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
1213

1214
	if (!wq->fasync_list)
1215 1216
		sock_reset_flag(sk, SOCK_FASYNC);
	else
E
Eric Dumazet 已提交
1217
		sock_set_flag(sk, SOCK_FASYNC);
L
Linus Torvalds 已提交
1218

1219
	release_sock(sk);
L
Linus Torvalds 已提交
1220 1221 1222
	return 0;
}

1223
/* This function may be called only under socket lock or callback_lock or rcu_lock */
L
Linus Torvalds 已提交
1224 1225 1226

int sock_wake_async(struct socket *sock, int how, int band)
{
1227 1228 1229 1230 1231 1232 1233 1234
	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
1235
		return -1;
1236
	}
1237
	switch (how) {
1238
	case SOCK_WAKE_WAITD:
L
Linus Torvalds 已提交
1239 1240 1241
		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
			break;
		goto call_kill;
1242
	case SOCK_WAKE_SPACE:
L
Linus Torvalds 已提交
1243 1244 1245
		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
			break;
		/* fall through */
1246
	case SOCK_WAKE_IO:
1247
call_kill:
1248
		kill_fasync(&wq->fasync_list, SIGIO, band);
L
Linus Torvalds 已提交
1249
		break;
1250
	case SOCK_WAKE_URG:
1251
		kill_fasync(&wq->fasync_list, SIGURG, band);
L
Linus Torvalds 已提交
1252
	}
1253
	rcu_read_unlock();
L
Linus Torvalds 已提交
1254 1255
	return 0;
}
1256
EXPORT_SYMBOL(sock_wake_async);
L
Linus Torvalds 已提交
1257

P
Pavel Emelyanov 已提交
1258
int __sock_create(struct net *net, int family, int type, int protocol,
1259
			 struct socket **res, int kern)
L
Linus Torvalds 已提交
1260 1261 1262
{
	int err;
	struct socket *sock;
1263
	const struct net_proto_family *pf;
L
Linus Torvalds 已提交
1264 1265

	/*
1266
	 *      Check protocol is in range
L
Linus Torvalds 已提交
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
	 */
	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) {
1279
		static int warned;
L
Linus Torvalds 已提交
1280 1281
		if (!warned) {
			warned = 1;
1282 1283
			printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
			       current->comm);
L
Linus Torvalds 已提交
1284 1285 1286 1287 1288 1289 1290
		}
		family = PF_PACKET;
	}

	err = security_socket_create(family, type, protocol, kern);
	if (err)
		return err;
1291

1292 1293 1294 1295 1296 1297 1298
	/*
	 *	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) {
1299
		net_warn_ratelimited("socket: no more sockets\n");
1300 1301 1302 1303 1304 1305
		return -ENFILE;	/* Not exactly a match, but its the
				   closest posix thing */
	}

	sock->type = type;

1306
#ifdef CONFIG_MODULES
1307 1308 1309
	/* 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
1310 1311 1312
	 * requested real, full-featured networking support upon configuration.
	 * Otherwise module support will break!
	 */
E
Eric Dumazet 已提交
1313
	if (rcu_access_pointer(net_families[family]) == NULL)
1314
		request_module("net-pf-%d", family);
L
Linus Torvalds 已提交
1315 1316
#endif

1317 1318 1319 1320 1321
	rcu_read_lock();
	pf = rcu_dereference(net_families[family]);
	err = -EAFNOSUPPORT;
	if (!pf)
		goto out_release;
L
Linus Torvalds 已提交
1322 1323 1324 1325 1326

	/*
	 * We will call the ->create function, that possibly is in a loadable
	 * module, so we have to bump that loadable module refcnt first.
	 */
1327
	if (!try_module_get(pf->owner))
L
Linus Torvalds 已提交
1328 1329
		goto out_release;

1330 1331 1332
	/* Now protected by module ref count */
	rcu_read_unlock();

1333
	err = pf->create(net, sock, protocol, kern);
1334
	if (err < 0)
L
Linus Torvalds 已提交
1335
		goto out_module_put;
1336

L
Linus Torvalds 已提交
1337 1338 1339 1340
	/*
	 * Now to bump the refcnt of the [loadable] module that owns this
	 * socket at sock_release time we decrement its refcnt.
	 */
1341 1342 1343
	if (!try_module_get(sock->ops->owner))
		goto out_module_busy;

L
Linus Torvalds 已提交
1344 1345 1346 1347
	/*
	 * Now that we're done with the ->create function, the [loadable]
	 * module can have its refcnt decremented
	 */
1348
	module_put(pf->owner);
V
Venkat Yekkirala 已提交
1349 1350
	err = security_socket_post_create(sock, family, type, protocol, kern);
	if (err)
1351
		goto out_sock_release;
1352
	*res = sock;
L
Linus Torvalds 已提交
1353

1354 1355 1356 1357
	return 0;

out_module_busy:
	err = -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1358
out_module_put:
1359 1360 1361
	sock->ops = NULL;
	module_put(pf->owner);
out_sock_release:
L
Linus Torvalds 已提交
1362
	sock_release(sock);
1363 1364 1365 1366 1367
	return err;

out_release:
	rcu_read_unlock();
	goto out_sock_release;
L
Linus Torvalds 已提交
1368
}
P
Pavel Emelyanov 已提交
1369
EXPORT_SYMBOL(__sock_create);
L
Linus Torvalds 已提交
1370 1371 1372

int sock_create(int family, int type, int protocol, struct socket **res)
{
1373
	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
L
Linus Torvalds 已提交
1374
}
1375
EXPORT_SYMBOL(sock_create);
L
Linus Torvalds 已提交
1376 1377 1378

int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
1379
	return __sock_create(&init_net, family, type, protocol, res, 1);
L
Linus Torvalds 已提交
1380
}
1381
EXPORT_SYMBOL(sock_create_kern);
L
Linus Torvalds 已提交
1382

1383
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
L
Linus Torvalds 已提交
1384 1385 1386
{
	int retval;
	struct socket *sock;
1387 1388
	int flags;

1389 1390 1391 1392 1393 1394
	/* 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);

1395
	flags = type & ~SOCK_TYPE_MASK;
1396
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1397 1398
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1399

U
Ulrich Drepper 已提交
1400 1401 1402
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1403 1404 1405 1406
	retval = sock_create(family, type, protocol, &sock);
	if (retval < 0)
		goto out;

1407
	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
L
Linus Torvalds 已提交
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
	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.
 */

1424 1425
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
		int __user *, usockvec)
L
Linus Torvalds 已提交
1426 1427 1428
{
	struct socket *sock1, *sock2;
	int fd1, fd2, err;
A
Al Viro 已提交
1429
	struct file *newfile1, *newfile2;
1430 1431 1432
	int flags;

	flags = type & ~SOCK_TYPE_MASK;
1433
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1434 1435
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1436

U
Ulrich Drepper 已提交
1437 1438 1439
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
	/*
	 * 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);
1454
	if (err < 0)
L
Linus Torvalds 已提交
1455 1456
		goto out_release_both;

1457
	fd1 = get_unused_fd_flags(flags);
1458 1459
	if (unlikely(fd1 < 0)) {
		err = fd1;
A
Al Viro 已提交
1460
		goto out_release_both;
1461
	}
1462
	fd2 = get_unused_fd_flags(flags);
1463 1464
	if (unlikely(fd2 < 0)) {
		err = fd2;
1465 1466 1467 1468
		put_unused_fd(fd1);
		goto out_release_both;
	}

1469
	newfile1 = sock_alloc_file(sock1, flags, NULL);
1470 1471 1472 1473 1474 1475 1476
	if (unlikely(IS_ERR(newfile1))) {
		err = PTR_ERR(newfile1);
		put_unused_fd(fd1);
		put_unused_fd(fd2);
		goto out_release_both;
	}

1477
	newfile2 = sock_alloc_file(sock2, flags, NULL);
1478 1479
	if (IS_ERR(newfile2)) {
		err = PTR_ERR(newfile2);
1480 1481
		fput(newfile1);
		put_unused_fd(fd1);
1482
		put_unused_fd(fd2);
1483 1484
		sock_release(sock2);
		goto out;
A
Al Viro 已提交
1485 1486
	}

A
Al Viro 已提交
1487
	audit_fd_pair(fd1, fd2);
A
Al Viro 已提交
1488 1489
	fd_install(fd1, newfile1);
	fd_install(fd2, newfile2);
L
Linus Torvalds 已提交
1490 1491 1492 1493
	/* fd1 and fd2 may be already another descriptors.
	 * Not kernel problem.
	 */

1494
	err = put_user(fd1, &usockvec[0]);
L
Linus Torvalds 已提交
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
	if (!err)
		err = put_user(fd2, &usockvec[1]);
	if (!err)
		return 0;

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

out_release_both:
1505
	sock_release(sock2);
L
Linus Torvalds 已提交
1506
out_release_1:
1507
	sock_release(sock1);
L
Linus Torvalds 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
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).
 */

1520
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
L
Linus Torvalds 已提交
1521 1522
{
	struct socket *sock;
1523
	struct sockaddr_storage address;
1524
	int err, fput_needed;
L
Linus Torvalds 已提交
1525

1526
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1527
	if (sock) {
1528
		err = move_addr_to_kernel(umyaddr, addrlen, &address);
1529 1530
		if (err >= 0) {
			err = security_socket_bind(sock,
1531
						   (struct sockaddr *)&address,
1532
						   addrlen);
1533 1534
			if (!err)
				err = sock->ops->bind(sock,
1535
						      (struct sockaddr *)
1536
						      &address, addrlen);
L
Linus Torvalds 已提交
1537
		}
1538
		fput_light(sock->file, fput_needed);
1539
	}
L
Linus Torvalds 已提交
1540 1541 1542 1543 1544 1545 1546 1547 1548
	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.
 */

1549
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
L
Linus Torvalds 已提交
1550 1551
{
	struct socket *sock;
1552
	int err, fput_needed;
1553
	int somaxconn;
1554 1555 1556

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
1557
		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1558
		if ((unsigned int)backlog > somaxconn)
1559
			backlog = somaxconn;
L
Linus Torvalds 已提交
1560 1561

		err = security_socket_listen(sock, backlog);
1562 1563
		if (!err)
			err = sock->ops->listen(sock, backlog);
L
Linus Torvalds 已提交
1564

1565
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
	}
	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.
 */

1582 1583
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen, int, flags)
L
Linus Torvalds 已提交
1584 1585
{
	struct socket *sock, *newsock;
1586
	struct file *newfile;
1587
	int err, len, newfd, fput_needed;
1588
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1589

1590
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
U
Ulrich Drepper 已提交
1591 1592 1593 1594 1595
		return -EINVAL;

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

1596
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1597 1598 1599 1600
	if (!sock)
		goto out;

	err = -ENFILE;
1601 1602
	newsock = sock_alloc();
	if (!newsock)
L
Linus Torvalds 已提交
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
		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);

1614
	newfd = get_unused_fd_flags(flags);
1615 1616
	if (unlikely(newfd < 0)) {
		err = newfd;
1617 1618
		sock_release(newsock);
		goto out_put;
1619
	}
1620
	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1621 1622 1623 1624 1625 1626
	if (unlikely(IS_ERR(newfile))) {
		err = PTR_ERR(newfile);
		put_unused_fd(newfd);
		sock_release(newsock);
		goto out_put;
	}
1627

1628 1629
	err = security_socket_accept(sock, newsock);
	if (err)
1630
		goto out_fd;
1631

L
Linus Torvalds 已提交
1632 1633
	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
	if (err < 0)
1634
		goto out_fd;
L
Linus Torvalds 已提交
1635 1636

	if (upeer_sockaddr) {
1637
		if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1638
					  &len, 2) < 0) {
L
Linus Torvalds 已提交
1639
			err = -ECONNABORTED;
1640
			goto out_fd;
L
Linus Torvalds 已提交
1641
		}
1642
		err = move_addr_to_user(&address,
1643
					len, upeer_sockaddr, upeer_addrlen);
L
Linus Torvalds 已提交
1644
		if (err < 0)
1645
			goto out_fd;
L
Linus Torvalds 已提交
1646 1647 1648 1649
	}

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

1650 1651
	fd_install(newfd, newfile);
	err = newfd;
L
Linus Torvalds 已提交
1652 1653

out_put:
1654
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1655 1656
out:
	return err;
1657
out_fd:
1658
	fput(newfile);
1659
	put_unused_fd(newfd);
L
Linus Torvalds 已提交
1660 1661 1662
	goto out_put;
}

1663 1664
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen)
U
Ulrich Drepper 已提交
1665
{
U
Ulrich Drepper 已提交
1666
	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
U
Ulrich Drepper 已提交
1667 1668
}

L
Linus Torvalds 已提交
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
/*
 *	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.
 */

1681 1682
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
		int, addrlen)
L
Linus Torvalds 已提交
1683 1684
{
	struct socket *sock;
1685
	struct sockaddr_storage address;
1686
	int err, fput_needed;
L
Linus Torvalds 已提交
1687

1688
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1689 1690
	if (!sock)
		goto out;
1691
	err = move_addr_to_kernel(uservaddr, addrlen, &address);
L
Linus Torvalds 已提交
1692 1693 1694
	if (err < 0)
		goto out_put;

1695
	err =
1696
	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
L
Linus Torvalds 已提交
1697 1698 1699
	if (err)
		goto out_put;

1700
	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
L
Linus Torvalds 已提交
1701 1702
				 sock->file->f_flags);
out_put:
1703
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1704 1705 1706 1707 1708 1709 1710 1711 1712
out:
	return err;
}

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

1713 1714
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1715 1716
{
	struct socket *sock;
1717
	struct sockaddr_storage address;
1718
	int len, err, fput_needed;
1719

1720
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1721 1722 1723 1724 1725 1726 1727
	if (!sock)
		goto out;

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

1728
	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
L
Linus Torvalds 已提交
1729 1730
	if (err)
		goto out_put;
1731
	err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
L
Linus Torvalds 已提交
1732 1733

out_put:
1734
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1735 1736 1737 1738 1739 1740 1741 1742 1743
out:
	return err;
}

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

1744 1745
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1746 1747
{
	struct socket *sock;
1748
	struct sockaddr_storage address;
1749
	int len, err, fput_needed;
L
Linus Torvalds 已提交
1750

1751 1752
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1753 1754
		err = security_socket_getpeername(sock);
		if (err) {
1755
			fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1756 1757 1758
			return err;
		}

1759
		err =
1760
		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1761
				       1);
L
Linus Torvalds 已提交
1762
		if (!err)
1763
			err = move_addr_to_user(&address, len, usockaddr,
1764
						usockaddr_len);
1765
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
	}
	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.
 */

1776
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1777
		unsigned int, flags, struct sockaddr __user *, addr,
1778
		int, addr_len)
L
Linus Torvalds 已提交
1779 1780
{
	struct socket *sock;
1781
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1782 1783 1784
	int err;
	struct msghdr msg;
	struct iovec iov;
1785 1786
	int fput_needed;

1787 1788
	if (len > INT_MAX)
		len = INT_MAX;
1789 1790
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
1791
		goto out;
1792

1793 1794 1795 1796 1797 1798 1799 1800
	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;
1801
	if (addr) {
1802
		err = move_addr_to_kernel(addr, addr_len, &address);
L
Linus Torvalds 已提交
1803 1804
		if (err < 0)
			goto out_put;
1805
		msg.msg_name = (struct sockaddr *)&address;
1806
		msg.msg_namelen = addr_len;
L
Linus Torvalds 已提交
1807 1808 1809 1810 1811 1812
	}
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
	msg.msg_flags = flags;
	err = sock_sendmsg(sock, &msg, len);

1813
out_put:
1814
	fput_light(sock->file, fput_needed);
1815
out:
L
Linus Torvalds 已提交
1816 1817 1818 1819
	return err;
}

/*
1820
 *	Send a datagram down a socket.
L
Linus Torvalds 已提交
1821 1822
 */

1823
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1824
		unsigned int, flags)
L
Linus Torvalds 已提交
1825 1826 1827 1828 1829
{
	return sys_sendto(fd, buff, len, flags, NULL, 0);
}

/*
1830
 *	Receive a frame from the socket and optionally record the address of the
L
Linus Torvalds 已提交
1831 1832 1833 1834
 *	sender. We verify the buffers are writable and if needed move the
 *	sender address from kernel to user space.
 */

1835
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1836
		unsigned int, flags, struct sockaddr __user *, addr,
1837
		int __user *, addr_len)
L
Linus Torvalds 已提交
1838 1839 1840 1841
{
	struct socket *sock;
	struct iovec iov;
	struct msghdr msg;
1842
	struct sockaddr_storage address;
1843
	int err, err2;
1844 1845
	int fput_needed;

1846 1847
	if (size > INT_MAX)
		size = INT_MAX;
1848
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1849
	if (!sock)
1850
		goto out;
L
Linus Torvalds 已提交
1851

1852 1853 1854 1855 1856 1857
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_iovlen = 1;
	msg.msg_iov = &iov;
	iov.iov_len = size;
	iov.iov_base = ubuf;
1858 1859
	msg.msg_name = (struct sockaddr *)&address;
	msg.msg_namelen = sizeof(address);
L
Linus Torvalds 已提交
1860 1861
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
1862
	err = sock_recvmsg(sock, &msg, size, flags);
L
Linus Torvalds 已提交
1863

1864
	if (err >= 0 && addr != NULL) {
1865
		err2 = move_addr_to_user(&address,
1866
					 msg.msg_namelen, addr, addr_len);
1867 1868
		if (err2 < 0)
			err = err2;
L
Linus Torvalds 已提交
1869
	}
1870 1871

	fput_light(sock->file, fput_needed);
1872
out:
L
Linus Torvalds 已提交
1873 1874 1875 1876
	return err;
}

/*
1877
 *	Receive a datagram from a socket.
L
Linus Torvalds 已提交
1878 1879
 */

1880
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1881
			 unsigned int flags)
L
Linus Torvalds 已提交
1882 1883 1884 1885 1886 1887 1888 1889 1890
{
	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.
 */

1891 1892
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int, optlen)
L
Linus Torvalds 已提交
1893
{
1894
	int err, fput_needed;
L
Linus Torvalds 已提交
1895 1896 1897 1898
	struct socket *sock;

	if (optlen < 0)
		return -EINVAL;
1899 1900 1901 1902

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
		err = security_socket_setsockopt(sock, level, optname);
1903 1904
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1905 1906

		if (level == SOL_SOCKET)
1907 1908 1909
			err =
			    sock_setsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1910
		else
1911 1912 1913
			err =
			    sock->ops->setsockopt(sock, level, optname, optval,
						  optlen);
1914 1915
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1916 1917 1918 1919 1920 1921 1922 1923 1924
	}
	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.
 */

1925 1926
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int __user *, optlen)
L
Linus Torvalds 已提交
1927
{
1928
	int err, fput_needed;
L
Linus Torvalds 已提交
1929 1930
	struct socket *sock;

1931 1932
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
1933 1934 1935
		err = security_socket_getsockopt(sock, level, optname);
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1936 1937

		if (level == SOL_SOCKET)
1938 1939 1940
			err =
			    sock_getsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1941
		else
1942 1943 1944
			err =
			    sock->ops->getsockopt(sock, level, optname, optval,
						  optlen);
1945 1946
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1947 1948 1949 1950 1951 1952 1953 1954
	}
	return err;
}

/*
 *	Shutdown a socket.
 */

1955
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
L
Linus Torvalds 已提交
1956
{
1957
	int err, fput_needed;
L
Linus Torvalds 已提交
1958 1959
	struct socket *sock;

1960 1961
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1962
		err = security_socket_shutdown(sock, how);
1963 1964 1965
		if (!err)
			err = sock->ops->shutdown(sock, how);
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1966 1967 1968 1969
	}
	return err;
}

1970
/* A couple of helpful macros for getting the address of the 32/64 bit
L
Linus Torvalds 已提交
1971 1972 1973 1974 1975 1976
 * 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)

1977 1978 1979 1980 1981
struct used_address {
	struct sockaddr_storage name;
	unsigned int name_len;
};

1982
static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
1983
			 struct msghdr *msg_sys, unsigned int flags,
1984
			 struct used_address *used_address)
L
Linus Torvalds 已提交
1985
{
1986 1987
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
1988
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1989
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1990
	unsigned char ctl[sizeof(struct cmsghdr) + 20]
1991 1992
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));
	/* 20 is size of ipv6_pktinfo */
L
Linus Torvalds 已提交
1993
	unsigned char *ctl_buf = ctl;
E
Eric Dumazet 已提交
1994
	int err, ctl_len, total_len;
1995

L
Linus Torvalds 已提交
1996 1997
	err = -EFAULT;
	if (MSG_CMSG_COMPAT & flags) {
1998
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
1999
			return -EFAULT;
2000
	} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
L
Linus Torvalds 已提交
2001 2002
		return -EFAULT;

2003
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
E
Eric Dumazet 已提交
2004 2005 2006 2007 2008 2009
		err = -EMSGSIZE;
		if (msg_sys->msg_iovlen > UIO_MAXIOV)
			goto out;
		err = -ENOMEM;
		iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
			      GFP_KERNEL);
L
Linus Torvalds 已提交
2010
		if (!iov)
2011
			goto out;
L
Linus Torvalds 已提交
2012 2013 2014 2015
	}

	/* This will also move the address data into kernel space */
	if (MSG_CMSG_COMPAT & flags) {
2016
		err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
L
Linus Torvalds 已提交
2017
	} else
2018
		err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2019
	if (err < 0)
L
Linus Torvalds 已提交
2020 2021 2022 2023 2024
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

2025
	if (msg_sys->msg_controllen > INT_MAX)
L
Linus Torvalds 已提交
2026
		goto out_freeiov;
2027
	ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
2028
	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2029
		err =
2030
		    cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2031
						     sizeof(ctl));
L
Linus Torvalds 已提交
2032 2033
		if (err)
			goto out_freeiov;
2034 2035
		ctl_buf = msg_sys->msg_control;
		ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
2036
	} else if (ctl_len) {
2037
		if (ctl_len > sizeof(ctl)) {
L
Linus Torvalds 已提交
2038
			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2039
			if (ctl_buf == NULL)
L
Linus Torvalds 已提交
2040 2041 2042 2043
				goto out_freeiov;
		}
		err = -EFAULT;
		/*
2044
		 * Careful! Before this, msg_sys->msg_control contains a user pointer.
L
Linus Torvalds 已提交
2045 2046 2047
		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
		 * checking falls down on this.
		 */
2048
		if (copy_from_user(ctl_buf,
2049
				   (void __user __force *)msg_sys->msg_control,
2050
				   ctl_len))
L
Linus Torvalds 已提交
2051
			goto out_freectl;
2052
		msg_sys->msg_control = ctl_buf;
L
Linus Torvalds 已提交
2053
	}
2054
	msg_sys->msg_flags = flags;
L
Linus Torvalds 已提交
2055 2056

	if (sock->file->f_flags & O_NONBLOCK)
2057
		msg_sys->msg_flags |= MSG_DONTWAIT;
2058 2059 2060 2061 2062 2063
	/*
	 * 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.
	 */
2064 2065 2066
	if (used_address && msg_sys->msg_name &&
	    used_address->name_len == msg_sys->msg_namelen &&
	    !memcmp(&used_address->name, msg_sys->msg_name,
2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
		    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;
2078 2079 2080
		if (msg_sys->msg_name)
			memcpy(&used_address->name, msg_sys->msg_name,
			       used_address->name_len);
2081
	}
L
Linus Torvalds 已提交
2082 2083

out_freectl:
2084
	if (ctl_buf != ctl)
L
Linus Torvalds 已提交
2085 2086 2087
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
E
Eric Dumazet 已提交
2088
		kfree(iov);
2089 2090 2091 2092 2093 2094 2095 2096
out:
	return err;
}

/*
 *	BSD sendmsg interface
 */

2097
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2098 2099 2100 2101 2102 2103 2104 2105
{
	int fput_needed, err;
	struct msghdr msg_sys;
	struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);

	if (!sock)
		goto out;

2106
	err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2107

2108
	fput_light(sock->file, fput_needed);
2109
out:
L
Linus Torvalds 已提交
2110 2111 2112
	return err;
}

2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
/*
 *	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;
2125
	struct used_address used_address;
2126

2127 2128
	if (vlen > UIO_MAXIOV)
		vlen = UIO_MAXIOV;
2129 2130 2131 2132 2133 2134 2135

	datagrams = 0;

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

2136
	used_address.name_len = UINT_MAX;
2137 2138
	entry = mmsg;
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2139
	err = 0;
2140 2141 2142 2143

	while (datagrams < vlen) {
		if (MSG_CMSG_COMPAT & flags) {
			err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2144
					    &msg_sys, flags, &used_address);
2145 2146 2147 2148 2149 2150
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
			err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
2151
					    &msg_sys, flags, &used_address);
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

		if (err)
			break;
		++datagrams;
	}

	fput_light(sock->file, fput_needed);

2165 2166
	/* We only return an error if no datagrams were able to be sent */
	if (datagrams != 0)
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177
		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);
}

2178
static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2179
			 struct msghdr *msg_sys, unsigned int flags, int nosec)
L
Linus Torvalds 已提交
2180
{
2181 2182
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
Linus Torvalds 已提交
2183
	struct iovec iovstack[UIO_FASTIOV];
2184
	struct iovec *iov = iovstack;
L
Linus Torvalds 已提交
2185
	unsigned long cmsg_ptr;
E
Eric Dumazet 已提交
2186
	int err, total_len, len;
L
Linus Torvalds 已提交
2187 2188

	/* kernel mode address */
2189
	struct sockaddr_storage addr;
L
Linus Torvalds 已提交
2190 2191 2192 2193

	/* user mode address pointers */
	struct sockaddr __user *uaddr;
	int __user *uaddr_len;
2194

L
Linus Torvalds 已提交
2195
	if (MSG_CMSG_COMPAT & flags) {
2196
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
2197
			return -EFAULT;
2198
	} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
2199
		return -EFAULT;
L
Linus Torvalds 已提交
2200

2201
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
E
Eric Dumazet 已提交
2202 2203 2204 2205 2206 2207
		err = -EMSGSIZE;
		if (msg_sys->msg_iovlen > UIO_MAXIOV)
			goto out;
		err = -ENOMEM;
		iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
			      GFP_KERNEL);
L
Linus Torvalds 已提交
2208
		if (!iov)
2209
			goto out;
L
Linus Torvalds 已提交
2210 2211 2212
	}

	/*
2213 2214
	 *      Save the user-mode address (verify_iovec will change the
	 *      kernel msghdr to use the kernel address space)
L
Linus Torvalds 已提交
2215
	 */
2216

2217
	uaddr = (__force void __user *)msg_sys->msg_name;
L
Linus Torvalds 已提交
2218 2219
	uaddr_len = COMPAT_NAMELEN(msg);
	if (MSG_CMSG_COMPAT & flags) {
2220
		err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
L
Linus Torvalds 已提交
2221
	} else
2222
		err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
L
Linus Torvalds 已提交
2223 2224
	if (err < 0)
		goto out_freeiov;
2225
	total_len = err;
L
Linus Torvalds 已提交
2226

2227 2228
	cmsg_ptr = (unsigned long)msg_sys->msg_control;
	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2229

L
Linus Torvalds 已提交
2230 2231
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
2232 2233
	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
							  total_len, flags);
L
Linus Torvalds 已提交
2234 2235 2236 2237 2238
	if (err < 0)
		goto out_freeiov;
	len = err;

	if (uaddr != NULL) {
2239
		err = move_addr_to_user(&addr,
2240
					msg_sys->msg_namelen, uaddr,
2241
					uaddr_len);
L
Linus Torvalds 已提交
2242 2243 2244
		if (err < 0)
			goto out_freeiov;
	}
2245
	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2246
			 COMPAT_FLAGS(msg));
L
Linus Torvalds 已提交
2247 2248 2249
	if (err)
		goto out_freeiov;
	if (MSG_CMSG_COMPAT & flags)
2250
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2251 2252
				 &msg_compat->msg_controllen);
	else
2253
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2254 2255 2256 2257 2258 2259 2260
				 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

out_freeiov:
	if (iov != iovstack)
E
Eric Dumazet 已提交
2261
		kfree(iov);
2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281
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);

2282
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
2283 2284 2285 2286
out:
	return err;
}

2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
/*
 *     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;
2297
	struct compat_mmsghdr __user *compat_entry;
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316
	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;
2317
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2318 2319 2320 2321 2322

	while (datagrams < vlen) {
		/*
		 * No need to ask LSM for more than the first datagram.
		 */
2323 2324
		if (MSG_CMSG_COMPAT & flags) {
			err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2325 2326
					    &msg_sys, flags & ~MSG_WAITFORONE,
					    datagrams);
2327 2328 2329 2330 2331 2332
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
			err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2333 2334
					    &msg_sys, flags & ~MSG_WAITFORONE,
					    datagrams);
2335 2336 2337 2338 2339 2340
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

2341 2342 2343 2344
		if (err)
			break;
		++datagrams;

2345 2346 2347 2348
		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
		if (flags & MSG_WAITFORONE)
			flags |= MSG_DONTWAIT;

2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
		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
2369

2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416
	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
2417 2418
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
2419
static const unsigned char nargs[21] = {
2420 2421 2422
	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),
2423
	AL(4), AL(5), AL(4)
2424 2425
};

L
Linus Torvalds 已提交
2426 2427 2428
#undef AL

/*
2429
 *	System call vectors.
L
Linus Torvalds 已提交
2430 2431 2432
 *
 *	Argument checking cleaned up. Saved 20% in size.
 *  This function doesn't need to set the kernel lock because
2433
 *  it is set by the callees.
L
Linus Torvalds 已提交
2434 2435
 */

2436
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
L
Linus Torvalds 已提交
2437 2438
{
	unsigned long a[6];
2439
	unsigned long a0, a1;
L
Linus Torvalds 已提交
2440
	int err;
2441
	unsigned int len;
L
Linus Torvalds 已提交
2442

2443
	if (call < 1 || call > SYS_SENDMMSG)
L
Linus Torvalds 已提交
2444 2445
		return -EINVAL;

2446 2447 2448 2449
	len = nargs[call];
	if (len > sizeof(a))
		return -EINVAL;

L
Linus Torvalds 已提交
2450
	/* copy_from_user should be SMP safe. */
2451
	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
2452
		return -EFAULT;
2453

A
Al Viro 已提交
2454
	audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2455

2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472
	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
2473 2474
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], 0);
2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517
		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;
2518 2519 2520
	case SYS_SENDMMSG:
		err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
		break;
2521 2522 2523
	case SYS_RECVMSG:
		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
2524 2525 2526 2527
	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
2528 2529 2530
	case SYS_ACCEPT4:
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], a[3]);
U
Ulrich Drepper 已提交
2531
		break;
2532 2533 2534
	default:
		err = -EINVAL;
		break;
L
Linus Torvalds 已提交
2535 2536 2537 2538
	}
	return err;
}

2539
#endif				/* __ARCH_WANT_SYS_SOCKETCALL */
L
Linus Torvalds 已提交
2540

2541 2542 2543 2544
/**
 *	sock_register - add a socket protocol handler
 *	@ops: description of protocol
 *
L
Linus Torvalds 已提交
2545 2546
 *	This function is called by a protocol handler that wants to
 *	advertise its address family, and have it linked into the
2547 2548
 *	socket interface. The value ops->family coresponds to the
 *	socket system call protocol family.
L
Linus Torvalds 已提交
2549
 */
2550
int sock_register(const struct net_proto_family *ops)
L
Linus Torvalds 已提交
2551 2552 2553 2554
{
	int err;

	if (ops->family >= NPROTO) {
2555 2556
		printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
		       NPROTO);
L
Linus Torvalds 已提交
2557 2558
		return -ENOBUFS;
	}
2559 2560

	spin_lock(&net_family_lock);
E
Eric Dumazet 已提交
2561 2562
	if (rcu_dereference_protected(net_families[ops->family],
				      lockdep_is_held(&net_family_lock)))
2563 2564
		err = -EEXIST;
	else {
2565
		rcu_assign_pointer(net_families[ops->family], ops);
L
Linus Torvalds 已提交
2566 2567
		err = 0;
	}
2568 2569
	spin_unlock(&net_family_lock);

2570
	printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
L
Linus Torvalds 已提交
2571 2572
	return err;
}
2573
EXPORT_SYMBOL(sock_register);
L
Linus Torvalds 已提交
2574

2575 2576 2577 2578
/**
 *	sock_unregister - remove a protocol handler
 *	@family: protocol family to remove
 *
L
Linus Torvalds 已提交
2579 2580
 *	This function is called by a protocol handler that wants to
 *	remove its address family, and have it unlinked from the
2581 2582 2583 2584 2585 2586
 *	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
2587
 */
2588
void sock_unregister(int family)
L
Linus Torvalds 已提交
2589
{
2590
	BUG_ON(family < 0 || family >= NPROTO);
L
Linus Torvalds 已提交
2591

2592
	spin_lock(&net_family_lock);
2593
	RCU_INIT_POINTER(net_families[family], NULL);
2594 2595 2596 2597
	spin_unlock(&net_family_lock);

	synchronize_rcu();

2598
	printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
L
Linus Torvalds 已提交
2599
}
2600
EXPORT_SYMBOL(sock_unregister);
L
Linus Torvalds 已提交
2601

2602
static int __init sock_init(void)
L
Linus Torvalds 已提交
2603
{
N
Nick Piggin 已提交
2604
	int err;
2605 2606 2607 2608 2609 2610
	/*
	 *      Initialize the network sysctl infrastructure.
	 */
	err = net_sysctl_init();
	if (err)
		goto out;
N
Nick Piggin 已提交
2611

L
Linus Torvalds 已提交
2612
	/*
2613
	 *      Initialize skbuff SLAB cache
L
Linus Torvalds 已提交
2614 2615 2616 2617
	 */
	skb_init();

	/*
2618
	 *      Initialize the protocols module.
L
Linus Torvalds 已提交
2619 2620 2621
	 */

	init_inodecache();
N
Nick Piggin 已提交
2622 2623 2624 2625

	err = register_filesystem(&sock_fs_type);
	if (err)
		goto out_fs;
L
Linus Torvalds 已提交
2626
	sock_mnt = kern_mount(&sock_fs_type);
N
Nick Piggin 已提交
2627 2628 2629 2630
	if (IS_ERR(sock_mnt)) {
		err = PTR_ERR(sock_mnt);
		goto out_mount;
	}
2631 2632

	/* The real protocol initialization is performed in later initcalls.
L
Linus Torvalds 已提交
2633 2634 2635 2636 2637
	 */

#ifdef CONFIG_NETFILTER
	netfilter_init();
#endif
2638

2639 2640 2641 2642
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
	skb_timestamping_init();
#endif

N
Nick Piggin 已提交
2643 2644 2645 2646 2647 2648 2649
out:
	return err;

out_mount:
	unregister_filesystem(&sock_fs_type);
out_fs:
	goto out;
L
Linus Torvalds 已提交
2650 2651
}

2652 2653
core_initcall(sock_init);	/* early initcall */

L
Linus Torvalds 已提交
2654 2655 2656 2657 2658 2659
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
	int cpu;
	int counter = 0;

2660
	for_each_possible_cpu(cpu)
2661
	    counter += per_cpu(sockets_in_use, cpu);
L
Linus Torvalds 已提交
2662 2663 2664 2665 2666 2667 2668

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

	seq_printf(seq, "sockets: used %d\n", counter);
}
2669
#endif				/* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2670

2671
#ifdef CONFIG_COMPAT
2672
static int do_siocgstamp(struct net *net, struct socket *sock,
2673
			 unsigned int cmd, void __user *up)
2674 2675 2676 2677 2678 2679
{
	mm_segment_t old_fs = get_fs();
	struct timeval ktv;
	int err;

	set_fs(KERNEL_DS);
2680
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2681
	set_fs(old_fs);
2682
	if (!err)
2683
		err = compat_put_timeval(&ktv, up);
2684

2685 2686 2687
	return err;
}

2688
static int do_siocgstampns(struct net *net, struct socket *sock,
2689
			   unsigned int cmd, void __user *up)
2690 2691 2692 2693 2694 2695
{
	mm_segment_t old_fs = get_fs();
	struct timespec kts;
	int err;

	set_fs(KERNEL_DS);
2696
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2697
	set_fs(old_fs);
2698
	if (!err)
2699
		err = compat_put_timespec(&kts, up);
2700

2701 2702 2703
	return err;
}

2704
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2705 2706 2707 2708 2709
{
	struct ifreq __user *uifr;
	int err;

	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2710
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2711 2712
		return -EFAULT;

2713
	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2714 2715 2716
	if (err)
		return err;

2717
	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2718 2719 2720 2721 2722
		return -EFAULT;

	return 0;
}

2723
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2724
{
2725
	struct compat_ifconf ifc32;
2726 2727
	struct ifconf ifc;
	struct ifconf __user *uifc;
2728
	struct compat_ifreq __user *ifr32;
2729 2730 2731 2732
	struct ifreq __user *ifr;
	unsigned int i, j;
	int err;

2733
	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2734 2735
		return -EFAULT;

2736
	memset(&ifc, 0, sizeof(ifc));
2737 2738 2739 2740 2741 2742
	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 {
2743 2744
		size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
			sizeof(struct ifreq);
2745 2746 2747 2748
		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);
2749
		for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2750
			if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2751 2752 2753 2754 2755 2756 2757 2758
				return -EFAULT;
			ifr++;
			ifr32++;
		}
	}
	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
		return -EFAULT;

2759
	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2760 2761 2762 2763 2764 2765 2766 2767 2768
	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;
2769 2770 2771
	     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)))
2772 2773 2774 2775 2776 2777 2778 2779 2780 2781
			return -EFAULT;
		ifr32++;
		ifr++;
	}

	if (ifc32.ifcbuf == 0) {
		/* Translate from 64-bit structure multiple to
		 * a 32-bit one.
		 */
		i = ifc.ifc_len;
2782
		i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2783 2784 2785 2786
		ifc32.ifc_len = i;
	} else {
		ifc32.ifc_len = i;
	}
2787
	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2788 2789 2790 2791 2792
		return -EFAULT;

	return 0;
}

2793
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2794
{
2795 2796 2797 2798
	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;
2799
	struct ifreq __user *ifr;
2800 2801
	u32 rule_cnt = 0, actual_rule_cnt;
	u32 ethcmd;
2802
	u32 data;
2803
	int ret;
2804

2805 2806
	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
		return -EFAULT;
2807

2808 2809 2810
	compat_rxnfc = compat_ptr(data);

	if (get_user(ethcmd, &compat_rxnfc->cmd))
2811 2812
		return -EFAULT;

2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
	/* 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:
2830
	case ETHTOOL_SRXCLSRLINS:
2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842
		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))
2843 2844
		return -EFAULT;

2845 2846
	if (put_user(convert_in ? rxnfc : compat_ptr(data),
		     &ifr->ifr_ifru.ifru_data))
2847 2848
		return -EFAULT;

2849
	if (convert_in) {
2850
		/* We expect there to be holes between fs.m_ext and
2851 2852
		 * fs.ring_cookie and at the end of fs, but nowhere else.
		 */
2853 2854 2855 2856
		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));
2857 2858 2859 2860 2861 2862 2863
		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,
2864
				 (void *)(&rxnfc->fs.m_ext + 1) -
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880
				 (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,
2881
				 (const void *)(&rxnfc->fs.m_ext + 1) -
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911
				 (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;
2912 2913
}

2914 2915 2916 2917 2918 2919
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2920
	uifr = compat_alloc_user_space(sizeof(*uifr));
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
	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);
}

2935 2936
static int bond_ioctl(struct net *net, unsigned int cmd,
			 struct compat_ifreq __user *ifr32)
2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949
{
	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:
2950
		if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2951 2952 2953
			return -EFAULT;

		old_fs = get_fs();
2954
		set_fs(KERNEL_DS);
2955 2956
		err = dev_ioctl(net, cmd,
				(struct ifreq __user __force *) &kifr);
2957
		set_fs(old_fs);
2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972

		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;

2973
		return dev_ioctl(net, cmd, uifr);
2974
	default:
2975
		return -ENOIOCTLCMD;
2976
	}
2977 2978
}

2979 2980
static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
				 struct compat_ifreq __user *u_ifreq32)
2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004
{
	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;

3005
	return dev_ioctl(net, cmd, u_ifreq64);
3006 3007
}

3008 3009
static int dev_ifsioc(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_ifreq __user *uifr32)
3010
{
3011
	struct ifreq __user *uifr;
3012 3013
	int err;

3014 3015 3016 3017 3018 3019
	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);

3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031
	if (!err) {
		switch (cmd) {
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFINDEX:
		case SIOCGIFADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFNETMASK:
3032
		case SIOCGIFPFLAGS:
3033
		case SIOCGIFTXQLEN:
3034 3035
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
3036
			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3037 3038 3039 3040 3041 3042 3043
				err = -EFAULT;
			break;
		}
	}
	return err;
}

3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063
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();
3064
	set_fs(KERNEL_DS);
3065
	err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
3066
	set_fs(old_fs);
3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087

	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;

3088
	uifr = compat_alloc_user_space(sizeof(*uifr));
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102
	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);
}

3103
struct rtentry32 {
3104
	u32		rt_pad1;
3105 3106 3107
	struct sockaddr rt_dst;         /* target address               */
	struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
	struct sockaddr rt_genmask;     /* target network mask (IP)     */
3108 3109 3110 3111 3112 3113 3114
	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! */
3115
	/* char * */ u32 rt_dev;        /* forcing the device at add    */
3116 3117
	u32		rt_mtu;         /* per route MTU/Window         */
	u32		rt_window;      /* Window clamping              */
3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133
	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;
};

3134 3135
static int routing_ioctl(struct net *net, struct socket *sock,
			 unsigned int cmd, void __user *argp)
3136 3137 3138 3139 3140 3141 3142 3143 3144
{
	int ret;
	void *r = NULL;
	struct in6_rtmsg r6;
	struct rtentry r4;
	char devname[16];
	u32 rtdev;
	mm_segment_t old_fs = get_fs();

3145 3146
	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
		struct in6_rtmsg32 __user *ur6 = argp;
3147
		ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3148
			3 * sizeof(struct in6_addr));
3149 3150 3151 3152 3153 3154 3155
		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));
3156 3157 3158

		r = (void *) &r6;
	} else { /* ipv4 */
3159
		struct rtentry32 __user *ur4 = argp;
3160
		ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3161
					3 * sizeof(struct sockaddr));
3162 3163 3164 3165 3166 3167
		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));
3168
		if (rtdev) {
3169
			ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3170 3171
			r4.rt_dev = (char __user __force *)devname;
			devname[15] = 0;
3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182
		} else
			r4.rt_dev = NULL;

		r = (void *) &r4;
	}

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

3183
	set_fs(KERNEL_DS);
3184
	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3185
	set_fs(old_fs);
3186 3187 3188 3189 3190 3191 3192

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
3193
 * use compatible ioctls
3194
 */
3195
static int old_bridge_ioctl(compat_ulong_t __user *argp)
3196
{
3197
	compat_ulong_t tmp;
3198

3199
	if (get_user(tmp, argp))
3200 3201 3202 3203 3204 3205
		return -EFAULT;
	if (tmp == BRCTL_GET_VERSION)
		return BRCTL_VERSION + 1;
	return -EINVAL;
}

3206 3207 3208 3209 3210 3211
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);
3212

3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
	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);
3226 3227
	case SIOCWANDEV:
		return compat_siocwandev(net, argp);
3228 3229 3230
	case SIOCGIFMAP:
	case SIOCSIFMAP:
		return compat_sioc_ifmap(net, cmd, argp);
3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244
	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);
3245 3246
	case SIOCSHWTSTAMP:
		return compat_siocshwtstamp(net, argp);
3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288

	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:
3289 3290 3291 3292
	case SIOCSIFNAME:
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
3293
		return dev_ifsioc(net, sock, cmd, argp);
3294

3295 3296 3297 3298
	case SIOCSARP:
	case SIOCGARP:
	case SIOCDARP:
	case SIOCATMARK:
3299 3300 3301
		return sock_do_ioctl(net, sock, cmd, arg);
	}

3302 3303
	return -ENOIOCTLCMD;
}
3304

3305
static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3306
			      unsigned long arg)
3307 3308 3309
{
	struct socket *sock = file->private_data;
	int ret = -ENOIOCTLCMD;
3310 3311 3312 3313 3314
	struct sock *sk;
	struct net *net;

	sk = sock->sk;
	net = sock_net(sk);
3315 3316 3317 3318

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

3319 3320 3321 3322
	if (ret == -ENOIOCTLCMD &&
	    (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
		ret = compat_wext_handle_ioctl(net, cmd, arg);

3323 3324 3325
	if (ret == -ENOIOCTLCMD)
		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);

3326 3327 3328 3329
	return ret;
}
#endif

3330 3331 3332 3333
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
	return sock->ops->bind(sock, addr, addrlen);
}
3334
EXPORT_SYMBOL(kernel_bind);
3335 3336 3337 3338 3339

int kernel_listen(struct socket *sock, int backlog)
{
	return sock->ops->listen(sock, backlog);
}
3340
EXPORT_SYMBOL(kernel_listen);
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354

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);
3355
		*newsock = NULL;
3356 3357 3358 3359
		goto done;
	}

	(*newsock)->ops = sock->ops;
3360
	__module_get((*newsock)->ops->owner);
3361 3362 3363 3364

done:
	return err;
}
3365
EXPORT_SYMBOL(kernel_accept);
3366 3367

int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3368
		   int flags)
3369 3370 3371
{
	return sock->ops->connect(sock, addr, addrlen, flags);
}
3372
EXPORT_SYMBOL(kernel_connect);
3373 3374 3375 3376 3377 3378

int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 0);
}
3379
EXPORT_SYMBOL(kernel_getsockname);
3380 3381 3382 3383 3384 3385

int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 1);
}
3386
EXPORT_SYMBOL(kernel_getpeername);
3387 3388 3389 3390 3391

int kernel_getsockopt(struct socket *sock, int level, int optname,
			char *optval, int *optlen)
{
	mm_segment_t oldfs = get_fs();
3392 3393
	char __user *uoptval;
	int __user *uoptlen;
3394 3395
	int err;

3396 3397 3398
	uoptval = (char __user __force *) optval;
	uoptlen = (int __user __force *) optlen;

3399 3400
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3401
		err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3402
	else
3403 3404
		err = sock->ops->getsockopt(sock, level, optname, uoptval,
					    uoptlen);
3405 3406 3407
	set_fs(oldfs);
	return err;
}
3408
EXPORT_SYMBOL(kernel_getsockopt);
3409 3410

int kernel_setsockopt(struct socket *sock, int level, int optname,
3411
			char *optval, unsigned int optlen)
3412 3413
{
	mm_segment_t oldfs = get_fs();
3414
	char __user *uoptval;
3415 3416
	int err;

3417 3418
	uoptval = (char __user __force *) optval;

3419 3420
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3421
		err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3422
	else
3423
		err = sock->ops->setsockopt(sock, level, optname, uoptval,
3424 3425 3426 3427
					    optlen);
	set_fs(oldfs);
	return err;
}
3428
EXPORT_SYMBOL(kernel_setsockopt);
3429 3430 3431 3432 3433 3434 3435 3436 3437

int kernel_sendpage(struct socket *sock, struct page *page, int offset,
		    size_t size, int flags)
{
	if (sock->ops->sendpage)
		return sock->ops->sendpage(sock, page, offset, size, flags);

	return sock_no_sendpage(sock, page, offset, size, flags);
}
3438
EXPORT_SYMBOL(kernel_sendpage);
3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450

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;
}
3451
EXPORT_SYMBOL(kernel_sock_ioctl);
3452

3453 3454 3455 3456 3457
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
	return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);