socket.c 83.5 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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#include <net/busy_poll.h>
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#ifdef CONFIG_NET_RX_BUSY_POLL
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unsigned int sysctl_net_busy_read __read_mostly;
unsigned int sysctl_net_busy_poll __read_mostly;
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#endif
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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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	BUG_ON(klen > sizeof(struct sockaddr_storage));
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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)
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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(IS_ERR(file))) {
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		/* 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 file;
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	}

	sock->file = file;
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	file->f_flags = O_RDWR | (flags & O_NONBLOCK);
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	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,
573
	.llseek = noop_llseek,
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574 575 576 577 578 579 580 581
};

/**
 *	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
582
 *	an inode not a file.
L
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583
 */
584

L
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585 586 587 588 589 590 591 592 593 594
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);
	}

595
	if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
L
Linus Torvalds 已提交
596 597
		printk(KERN_ERR "sock_release: fasync list not empty!\n");

598 599 600
	if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
		return;

601
	this_cpu_sub(sockets_in_use, 1);
L
Linus Torvalds 已提交
602 603 604 605
	if (!sock->file) {
		iput(SOCK_INODE(sock));
		return;
	}
606
	sock->file = NULL;
L
Linus Torvalds 已提交
607
}
608
EXPORT_SYMBOL(sock_release);
L
Linus Torvalds 已提交
609

610
void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
611
{
612
	*tx_flags = 0;
613
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
614
		*tx_flags |= SKBTX_HW_TSTAMP;
615
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
616
		*tx_flags |= SKBTX_SW_TSTAMP;
617 618
	if (sock_flag(sk, SOCK_WIFI_STATUS))
		*tx_flags |= SKBTX_WIFI_STATUS;
619 620 621
}
EXPORT_SYMBOL(sock_tx_timestamp);

622 623
static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
				       struct msghdr *msg, size_t size)
L
Linus Torvalds 已提交
624 625 626 627 628 629 630 631 632 633 634
{
	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);
}

635 636 637 638 639 640 641 642
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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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;
}
656
EXPORT_SYMBOL(sock_sendmsg);
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Linus Torvalds 已提交
657

658
static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
659 660 661 662 663 664 665 666 667 668 669 670 671
{
	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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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
	 */
683
	msg->msg_iov = (struct iovec *)vec;
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	msg->msg_iovlen = num;
	result = sock_sendmsg(sock, msg, size);
	set_fs(oldfs);
	return result;
}
689
EXPORT_SYMBOL(kernel_sendmsg);
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Linus Torvalds 已提交
690

691 692 693 694 695 696
/*
 * 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)
{
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
	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 {
715
			skb_get_timestampns(skb, &ts[0]);
716
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
717
				 sizeof(ts[0]), &ts[0]);
718 719 720 721 722
		}
	}


	memset(ts, 0, sizeof(ts));
723 724
	if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
	    ktime_to_timespec_cond(skb->tstamp, ts + 0))
725 726 727
		empty = 0;
	if (shhwtstamps) {
		if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
728
		    ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
729 730
			empty = 0;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
731
		    ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
732
			empty = 0;
733
	}
734 735 736
	if (!empty)
		put_cmsg(msg, SOL_SOCKET,
			 SCM_TIMESTAMPING, sizeof(ts), &ts);
737
}
738 739
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);

740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
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
756 757
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
				   struct sk_buff *skb)
758 759 760 761 762 763
{
	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
		put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
			sizeof(__u32), &skb->dropcount);
}

764
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
765 766 767 768 769
	struct sk_buff *skb)
{
	sock_recv_timestamp(msg, sk, skb);
	sock_recv_drops(msg, sk, skb);
}
770
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
771

772 773
static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
				       struct msghdr *msg, size_t size, int flags)
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{
	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);
}

786 787 788 789 790 791 792 793
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);
}

794
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
L
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795 796 797 798 799 800
		 size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

801
	init_sync_kiocb(&iocb, NULL);
L
Linus Torvalds 已提交
802 803 804 805 806 807
	iocb.private = &siocb;
	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
808
EXPORT_SYMBOL(sock_recvmsg);
L
Linus Torvalds 已提交
809

810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
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;
}

825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
/**
 * 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.
 */
840 841
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
842 843 844 845 846 847 848 849 850
{
	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
	 */
851
	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
L
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852 853 854 855
	result = sock_recvmsg(sock, msg, size, flags);
	set_fs(oldfs);
	return result;
}
856
EXPORT_SYMBOL(kernel_recvmsg);
L
Linus Torvalds 已提交
857

858 859
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
860 861 862 863
{
	struct socket *sock;
	int flags;

864 865
	sock = file->private_data;

866 867 868
	flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
	/* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
	flags |= more;
869

870
	return kernel_sendpage(sock, page, offset, size, flags);
871
}
L
Linus Torvalds 已提交
872

J
Jens Axboe 已提交
873
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
874
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
875 876 877 878
				unsigned int flags)
{
	struct socket *sock = file->private_data;

879 880 881
	if (unlikely(!sock->ops->splice_read))
		return -EINVAL;

J
Jens Axboe 已提交
882 883 884
	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}

885
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
886
					 struct sock_iocb *siocb)
887
{
K
Kent Overstreet 已提交
888 889
	if (!is_sync_kiocb(iocb))
		BUG();
L
Linus Torvalds 已提交
890

891 892 893
	siocb->kiocb = iocb;
	iocb->private = siocb;
	return siocb;
L
Linus Torvalds 已提交
894 895
}

896
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
897 898
		struct file *file, const struct iovec *iov,
		unsigned long nr_segs)
899 900 901 902
{
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
903

904 905
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
906

907 908 909 910
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
911
	msg->msg_iov = (struct iovec *)iov;
912 913 914 915 916 917
	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);
}

918 919
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
920 921 922
{
	struct sock_iocb siocb, *x;

L
Linus Torvalds 已提交
923 924
	if (pos != 0)
		return -ESPIPE;
925

K
Kent Overstreet 已提交
926
	if (iocb->ki_nbytes == 0)	/* Match SYS5 behaviour */
L
Linus Torvalds 已提交
927 928
		return 0;

929 930

	x = alloc_sock_iocb(iocb, &siocb);
931 932
	if (!x)
		return -ENOMEM;
933
	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
934 935
}

936
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
937 938
			struct file *file, const struct iovec *iov,
			unsigned long nr_segs)
L
Linus Torvalds 已提交
939
{
940 941 942
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
943

944 945
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
946

947 948 949 950
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
951
	msg->msg_iov = (struct iovec *)iov;
952 953 954 955
	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
956

957
	return __sock_sendmsg(iocb, sock, msg, size);
L
Linus Torvalds 已提交
958 959
}

960 961
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos)
962 963
{
	struct sock_iocb siocb, *x;
L
Linus Torvalds 已提交
964

965 966
	if (pos != 0)
		return -ESPIPE;
967 968

	x = alloc_sock_iocb(iocb, &siocb);
969 970
	if (!x)
		return -ENOMEM;
L
Linus Torvalds 已提交
971

972
	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
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973 974 975 976 977 978 979
}

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

A
Arjan van de Ven 已提交
980
static DEFINE_MUTEX(br_ioctl_mutex);
981
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
L
Linus Torvalds 已提交
982

983
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
L
Linus Torvalds 已提交
984
{
A
Arjan van de Ven 已提交
985
	mutex_lock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
986
	br_ioctl_hook = hook;
A
Arjan van de Ven 已提交
987
	mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
988 989 990
}
EXPORT_SYMBOL(brioctl_set);

A
Arjan van de Ven 已提交
991
static DEFINE_MUTEX(vlan_ioctl_mutex);
992
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
L
Linus Torvalds 已提交
993

994
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
L
Linus Torvalds 已提交
995
{
A
Arjan van de Ven 已提交
996
	mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
997
	vlan_ioctl_hook = hook;
A
Arjan van de Ven 已提交
998
	mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
999 1000 1001
}
EXPORT_SYMBOL(vlan_ioctl_set);

A
Arjan van de Ven 已提交
1002
static DEFINE_MUTEX(dlci_ioctl_mutex);
1003
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
L
Linus Torvalds 已提交
1004

1005
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
L
Linus Torvalds 已提交
1006
{
A
Arjan van de Ven 已提交
1007
	mutex_lock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1008
	dlci_ioctl_hook = hook;
A
Arjan van de Ven 已提交
1009
	mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1010 1011 1012
}
EXPORT_SYMBOL(dlci_ioctl_set);

1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
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
1031 1032 1033 1034 1035 1036 1037 1038
/*
 *	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;
1039
	struct sock *sk;
L
Linus Torvalds 已提交
1040 1041
	void __user *argp = (void __user *)arg;
	int pid, err;
1042
	struct net *net;
L
Linus Torvalds 已提交
1043

1044
	sock = file->private_data;
1045
	sk = sock->sk;
1046
	net = sock_net(sk);
L
Linus Torvalds 已提交
1047
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1048
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1049
	} else
J
Johannes Berg 已提交
1050
#ifdef CONFIG_WEXT_CORE
L
Linus Torvalds 已提交
1051
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1052
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1053
	} else
J
Johannes Berg 已提交
1054
#endif
1055
		switch (cmd) {
L
Linus Torvalds 已提交
1056 1057 1058 1059 1060 1061 1062 1063 1064
		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:
1065
			err = put_user(f_getown(sock->file),
1066
				       (int __user *)argp);
L
Linus Torvalds 已提交
1067 1068 1069 1070 1071 1072 1073 1074 1075
			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
1076
			mutex_lock(&br_ioctl_mutex);
1077
			if (br_ioctl_hook)
1078
				err = br_ioctl_hook(net, cmd, argp);
A
Arjan van de Ven 已提交
1079
			mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1080 1081 1082 1083 1084 1085 1086
			break;
		case SIOCGIFVLAN:
		case SIOCSIFVLAN:
			err = -ENOPKG;
			if (!vlan_ioctl_hook)
				request_module("8021q");

A
Arjan van de Ven 已提交
1087
			mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1088
			if (vlan_ioctl_hook)
1089
				err = vlan_ioctl_hook(net, argp);
A
Arjan van de Ven 已提交
1090
			mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1091 1092 1093 1094 1095 1096 1097
			break;
		case SIOCADDDLCI:
		case SIOCDELDLCI:
			err = -ENOPKG;
			if (!dlci_ioctl_hook)
				request_module("dlci");

1098 1099
			mutex_lock(&dlci_ioctl_mutex);
			if (dlci_ioctl_hook)
L
Linus Torvalds 已提交
1100
				err = dlci_ioctl_hook(cmd, argp);
1101
			mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1102 1103
			break;
		default:
1104
			err = sock_do_ioctl(net, sock, cmd, arg);
L
Linus Torvalds 已提交
1105
			break;
1106
		}
L
Linus Torvalds 已提交
1107 1108 1109 1110 1111 1112 1113
	return err;
}

int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
	int err;
	struct socket *sock = NULL;
1114

L
Linus Torvalds 已提交
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
	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
1126 1127 1128 1129
	err = security_socket_post_create(sock, family, type, protocol, 1);
	if (err)
		goto out_release;

L
Linus Torvalds 已提交
1130 1131 1132
out:
	*res = sock;
	return err;
V
Venkat Yekkirala 已提交
1133 1134 1135 1136
out_release:
	sock_release(sock);
	sock = NULL;
	goto out;
L
Linus Torvalds 已提交
1137
}
1138
EXPORT_SYMBOL(sock_create_lite);
L
Linus Torvalds 已提交
1139 1140

/* No kernel lock held - perfect */
1141
static unsigned int sock_poll(struct file *file, poll_table *wait)
L
Linus Torvalds 已提交
1142
{
1143
	unsigned int busy_flag = 0;
L
Linus Torvalds 已提交
1144 1145 1146
	struct socket *sock;

	/*
1147
	 *      We can't return errors to poll, so it's either yes or no.
L
Linus Torvalds 已提交
1148
	 */
1149
	sock = file->private_data;
1150

1151
	if (sk_can_busy_loop(sock->sk)) {
1152
		/* this socket can poll_ll so tell the system call */
1153
		busy_flag = POLL_BUSY_LOOP;
1154 1155

		/* once, only if requested by syscall */
1156 1157
		if (wait && (wait->_key & POLL_BUSY_LOOP))
			sk_busy_loop(sock->sk, 1);
1158 1159
	}

1160
	return busy_flag | sock->ops->poll(file, sock, wait);
L
Linus Torvalds 已提交
1161 1162
}

1163
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1164
{
1165
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
1166 1167 1168 1169

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

1170
static int sock_close(struct inode *inode, struct file *filp)
L
Linus Torvalds 已提交
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
{
	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)
1184
 *	   or under socket lock
L
Linus Torvalds 已提交
1185 1186 1187 1188
 */

static int sock_fasync(int fd, struct file *filp, int on)
{
1189 1190
	struct socket *sock = filp->private_data;
	struct sock *sk = sock->sk;
1191
	struct socket_wq *wq;
L
Linus Torvalds 已提交
1192

1193
	if (sk == NULL)
L
Linus Torvalds 已提交
1194 1195 1196
		return -EINVAL;

	lock_sock(sk);
1197 1198
	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
1199

1200
	if (!wq->fasync_list)
1201 1202
		sock_reset_flag(sk, SOCK_FASYNC);
	else
E
Eric Dumazet 已提交
1203
		sock_set_flag(sk, SOCK_FASYNC);
L
Linus Torvalds 已提交
1204

1205
	release_sock(sk);
L
Linus Torvalds 已提交
1206 1207 1208
	return 0;
}

1209
/* This function may be called only under socket lock or callback_lock or rcu_lock */
L
Linus Torvalds 已提交
1210 1211 1212

int sock_wake_async(struct socket *sock, int how, int band)
{
1213 1214 1215 1216 1217 1218 1219 1220
	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
1221
		return -1;
1222
	}
1223
	switch (how) {
1224
	case SOCK_WAKE_WAITD:
L
Linus Torvalds 已提交
1225 1226 1227
		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
			break;
		goto call_kill;
1228
	case SOCK_WAKE_SPACE:
L
Linus Torvalds 已提交
1229 1230 1231
		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
			break;
		/* fall through */
1232
	case SOCK_WAKE_IO:
1233
call_kill:
1234
		kill_fasync(&wq->fasync_list, SIGIO, band);
L
Linus Torvalds 已提交
1235
		break;
1236
	case SOCK_WAKE_URG:
1237
		kill_fasync(&wq->fasync_list, SIGURG, band);
L
Linus Torvalds 已提交
1238
	}
1239
	rcu_read_unlock();
L
Linus Torvalds 已提交
1240 1241
	return 0;
}
1242
EXPORT_SYMBOL(sock_wake_async);
L
Linus Torvalds 已提交
1243

P
Pavel Emelyanov 已提交
1244
int __sock_create(struct net *net, int family, int type, int protocol,
1245
			 struct socket **res, int kern)
L
Linus Torvalds 已提交
1246 1247 1248
{
	int err;
	struct socket *sock;
1249
	const struct net_proto_family *pf;
L
Linus Torvalds 已提交
1250 1251

	/*
1252
	 *      Check protocol is in range
L
Linus Torvalds 已提交
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
	 */
	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) {
1265
		static int warned;
L
Linus Torvalds 已提交
1266 1267
		if (!warned) {
			warned = 1;
1268 1269
			printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
			       current->comm);
L
Linus Torvalds 已提交
1270 1271 1272 1273 1274 1275 1276
		}
		family = PF_PACKET;
	}

	err = security_socket_create(family, type, protocol, kern);
	if (err)
		return err;
1277

1278 1279 1280 1281 1282 1283 1284
	/*
	 *	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) {
1285
		net_warn_ratelimited("socket: no more sockets\n");
1286 1287 1288 1289 1290 1291
		return -ENFILE;	/* Not exactly a match, but its the
				   closest posix thing */
	}

	sock->type = type;

1292
#ifdef CONFIG_MODULES
1293 1294 1295
	/* 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
1296 1297 1298
	 * requested real, full-featured networking support upon configuration.
	 * Otherwise module support will break!
	 */
E
Eric Dumazet 已提交
1299
	if (rcu_access_pointer(net_families[family]) == NULL)
1300
		request_module("net-pf-%d", family);
L
Linus Torvalds 已提交
1301 1302
#endif

1303 1304 1305 1306 1307
	rcu_read_lock();
	pf = rcu_dereference(net_families[family]);
	err = -EAFNOSUPPORT;
	if (!pf)
		goto out_release;
L
Linus Torvalds 已提交
1308 1309 1310 1311 1312

	/*
	 * We will call the ->create function, that possibly is in a loadable
	 * module, so we have to bump that loadable module refcnt first.
	 */
1313
	if (!try_module_get(pf->owner))
L
Linus Torvalds 已提交
1314 1315
		goto out_release;

1316 1317 1318
	/* Now protected by module ref count */
	rcu_read_unlock();

1319
	err = pf->create(net, sock, protocol, kern);
1320
	if (err < 0)
L
Linus Torvalds 已提交
1321
		goto out_module_put;
1322

L
Linus Torvalds 已提交
1323 1324 1325 1326
	/*
	 * Now to bump the refcnt of the [loadable] module that owns this
	 * socket at sock_release time we decrement its refcnt.
	 */
1327 1328 1329
	if (!try_module_get(sock->ops->owner))
		goto out_module_busy;

L
Linus Torvalds 已提交
1330 1331 1332 1333
	/*
	 * Now that we're done with the ->create function, the [loadable]
	 * module can have its refcnt decremented
	 */
1334
	module_put(pf->owner);
V
Venkat Yekkirala 已提交
1335 1336
	err = security_socket_post_create(sock, family, type, protocol, kern);
	if (err)
1337
		goto out_sock_release;
1338
	*res = sock;
L
Linus Torvalds 已提交
1339

1340 1341 1342 1343
	return 0;

out_module_busy:
	err = -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1344
out_module_put:
1345 1346 1347
	sock->ops = NULL;
	module_put(pf->owner);
out_sock_release:
L
Linus Torvalds 已提交
1348
	sock_release(sock);
1349 1350 1351 1352 1353
	return err;

out_release:
	rcu_read_unlock();
	goto out_sock_release;
L
Linus Torvalds 已提交
1354
}
P
Pavel Emelyanov 已提交
1355
EXPORT_SYMBOL(__sock_create);
L
Linus Torvalds 已提交
1356 1357 1358

int sock_create(int family, int type, int protocol, struct socket **res)
{
1359
	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
L
Linus Torvalds 已提交
1360
}
1361
EXPORT_SYMBOL(sock_create);
L
Linus Torvalds 已提交
1362 1363 1364

int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
1365
	return __sock_create(&init_net, family, type, protocol, res, 1);
L
Linus Torvalds 已提交
1366
}
1367
EXPORT_SYMBOL(sock_create_kern);
L
Linus Torvalds 已提交
1368

1369
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
L
Linus Torvalds 已提交
1370 1371 1372
{
	int retval;
	struct socket *sock;
1373 1374
	int flags;

1375 1376 1377 1378 1379 1380
	/* 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);

1381
	flags = type & ~SOCK_TYPE_MASK;
1382
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1383 1384
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1385

U
Ulrich Drepper 已提交
1386 1387 1388
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1389 1390 1391 1392
	retval = sock_create(family, type, protocol, &sock);
	if (retval < 0)
		goto out;

1393
	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
L
Linus Torvalds 已提交
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
	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.
 */

1410 1411
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
		int __user *, usockvec)
L
Linus Torvalds 已提交
1412 1413 1414
{
	struct socket *sock1, *sock2;
	int fd1, fd2, err;
A
Al Viro 已提交
1415
	struct file *newfile1, *newfile2;
1416 1417 1418
	int flags;

	flags = type & ~SOCK_TYPE_MASK;
1419
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1420 1421
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1422

U
Ulrich Drepper 已提交
1423 1424 1425
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
	/*
	 * 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);
1440
	if (err < 0)
L
Linus Torvalds 已提交
1441 1442
		goto out_release_both;

1443
	fd1 = get_unused_fd_flags(flags);
1444 1445
	if (unlikely(fd1 < 0)) {
		err = fd1;
A
Al Viro 已提交
1446
		goto out_release_both;
1447
	}
1448

1449
	fd2 = get_unused_fd_flags(flags);
1450 1451
	if (unlikely(fd2 < 0)) {
		err = fd2;
1452
		goto out_put_unused_1;
1453 1454
	}

1455
	newfile1 = sock_alloc_file(sock1, flags, NULL);
1456 1457
	if (unlikely(IS_ERR(newfile1))) {
		err = PTR_ERR(newfile1);
1458
		goto out_put_unused_both;
1459 1460
	}

1461
	newfile2 = sock_alloc_file(sock2, flags, NULL);
1462 1463
	if (IS_ERR(newfile2)) {
		err = PTR_ERR(newfile2);
1464
		goto out_fput_1;
A
Al Viro 已提交
1465 1466
	}

1467 1468 1469 1470 1471 1472 1473 1474
	err = put_user(fd1, &usockvec[0]);
	if (err)
		goto out_fput_both;

	err = put_user(fd2, &usockvec[1]);
	if (err)
		goto out_fput_both;

A
Al Viro 已提交
1475
	audit_fd_pair(fd1, fd2);
1476

A
Al Viro 已提交
1477 1478
	fd_install(fd1, newfile1);
	fd_install(fd2, newfile2);
L
Linus Torvalds 已提交
1479 1480 1481 1482
	/* fd1 and fd2 may be already another descriptors.
	 * Not kernel problem.
	 */

1483
	return 0;
L
Linus Torvalds 已提交
1484

1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
out_fput_both:
	fput(newfile2);
	fput(newfile1);
	put_unused_fd(fd2);
	put_unused_fd(fd1);
	goto out;

out_fput_1:
	fput(newfile1);
	put_unused_fd(fd2);
	put_unused_fd(fd1);
	sock_release(sock2);
	goto out;
L
Linus Torvalds 已提交
1498

1499 1500 1501 1502
out_put_unused_both:
	put_unused_fd(fd2);
out_put_unused_1:
	put_unused_fd(fd1);
L
Linus Torvalds 已提交
1503
out_release_both:
1504
	sock_release(sock2);
L
Linus Torvalds 已提交
1505
out_release_1:
1506
	sock_release(sock1);
L
Linus Torvalds 已提交
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
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).
 */

1519
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
L
Linus Torvalds 已提交
1520 1521
{
	struct socket *sock;
1522
	struct sockaddr_storage address;
1523
	int err, fput_needed;
L
Linus Torvalds 已提交
1524

1525
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1526
	if (sock) {
1527
		err = move_addr_to_kernel(umyaddr, addrlen, &address);
1528 1529
		if (err >= 0) {
			err = security_socket_bind(sock,
1530
						   (struct sockaddr *)&address,
1531
						   addrlen);
1532 1533
			if (!err)
				err = sock->ops->bind(sock,
1534
						      (struct sockaddr *)
1535
						      &address, addrlen);
L
Linus Torvalds 已提交
1536
		}
1537
		fput_light(sock->file, fput_needed);
1538
	}
L
Linus Torvalds 已提交
1539 1540 1541 1542 1543 1544 1545 1546 1547
	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.
 */

1548
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
L
Linus Torvalds 已提交
1549 1550
{
	struct socket *sock;
1551
	int err, fput_needed;
1552
	int somaxconn;
1553 1554 1555

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
1556
		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1557
		if ((unsigned int)backlog > somaxconn)
1558
			backlog = somaxconn;
L
Linus Torvalds 已提交
1559 1560

		err = security_socket_listen(sock, backlog);
1561 1562
		if (!err)
			err = sock->ops->listen(sock, backlog);
L
Linus Torvalds 已提交
1563

1564
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580
	}
	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.
 */

1581 1582
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen, int, flags)
L
Linus Torvalds 已提交
1583 1584
{
	struct socket *sock, *newsock;
1585
	struct file *newfile;
1586
	int err, len, newfd, fput_needed;
1587
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1588

1589
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
U
Ulrich Drepper 已提交
1590 1591 1592 1593 1594
		return -EINVAL;

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

1595
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1596 1597 1598 1599
	if (!sock)
		goto out;

	err = -ENFILE;
1600 1601
	newsock = sock_alloc();
	if (!newsock)
L
Linus Torvalds 已提交
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
		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);

1613
	newfd = get_unused_fd_flags(flags);
1614 1615
	if (unlikely(newfd < 0)) {
		err = newfd;
1616 1617
		sock_release(newsock);
		goto out_put;
1618
	}
1619
	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1620 1621 1622 1623 1624 1625
	if (unlikely(IS_ERR(newfile))) {
		err = PTR_ERR(newfile);
		put_unused_fd(newfd);
		sock_release(newsock);
		goto out_put;
	}
1626

1627 1628
	err = security_socket_accept(sock, newsock);
	if (err)
1629
		goto out_fd;
1630

L
Linus Torvalds 已提交
1631 1632
	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
	if (err < 0)
1633
		goto out_fd;
L
Linus Torvalds 已提交
1634 1635

	if (upeer_sockaddr) {
1636
		if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1637
					  &len, 2) < 0) {
L
Linus Torvalds 已提交
1638
			err = -ECONNABORTED;
1639
			goto out_fd;
L
Linus Torvalds 已提交
1640
		}
1641
		err = move_addr_to_user(&address,
1642
					len, upeer_sockaddr, upeer_addrlen);
L
Linus Torvalds 已提交
1643
		if (err < 0)
1644
			goto out_fd;
L
Linus Torvalds 已提交
1645 1646 1647 1648
	}

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

1649 1650
	fd_install(newfd, newfile);
	err = newfd;
L
Linus Torvalds 已提交
1651 1652

out_put:
1653
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1654 1655
out:
	return err;
1656
out_fd:
1657
	fput(newfile);
1658
	put_unused_fd(newfd);
L
Linus Torvalds 已提交
1659 1660 1661
	goto out_put;
}

1662 1663
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen)
U
Ulrich Drepper 已提交
1664
{
U
Ulrich Drepper 已提交
1665
	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
U
Ulrich Drepper 已提交
1666 1667
}

L
Linus Torvalds 已提交
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
/*
 *	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.
 */

1680 1681
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
		int, addrlen)
L
Linus Torvalds 已提交
1682 1683
{
	struct socket *sock;
1684
	struct sockaddr_storage address;
1685
	int err, fput_needed;
L
Linus Torvalds 已提交
1686

1687
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1688 1689
	if (!sock)
		goto out;
1690
	err = move_addr_to_kernel(uservaddr, addrlen, &address);
L
Linus Torvalds 已提交
1691 1692 1693
	if (err < 0)
		goto out_put;

1694
	err =
1695
	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
L
Linus Torvalds 已提交
1696 1697 1698
	if (err)
		goto out_put;

1699
	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
L
Linus Torvalds 已提交
1700 1701
				 sock->file->f_flags);
out_put:
1702
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1703 1704 1705 1706 1707 1708 1709 1710 1711
out:
	return err;
}

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

1712 1713
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1714 1715
{
	struct socket *sock;
1716
	struct sockaddr_storage address;
1717
	int len, err, fput_needed;
1718

1719
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1720 1721 1722 1723 1724 1725 1726
	if (!sock)
		goto out;

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

1727
	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
L
Linus Torvalds 已提交
1728 1729
	if (err)
		goto out_put;
1730
	err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
L
Linus Torvalds 已提交
1731 1732

out_put:
1733
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1734 1735 1736 1737 1738 1739 1740 1741 1742
out:
	return err;
}

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

1743 1744
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1745 1746
{
	struct socket *sock;
1747
	struct sockaddr_storage address;
1748
	int len, err, fput_needed;
L
Linus Torvalds 已提交
1749

1750 1751
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1752 1753
		err = security_socket_getpeername(sock);
		if (err) {
1754
			fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1755 1756 1757
			return err;
		}

1758
		err =
1759
		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1760
				       1);
L
Linus Torvalds 已提交
1761
		if (!err)
1762
			err = move_addr_to_user(&address, len, usockaddr,
1763
						usockaddr_len);
1764
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
	}
	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.
 */

1775
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1776
		unsigned int, flags, struct sockaddr __user *, addr,
1777
		int, addr_len)
L
Linus Torvalds 已提交
1778 1779
{
	struct socket *sock;
1780
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1781 1782 1783
	int err;
	struct msghdr msg;
	struct iovec iov;
1784 1785
	int fput_needed;

1786 1787
	if (len > INT_MAX)
		len = INT_MAX;
1788 1789
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
1790
		goto out;
1791

1792 1793 1794 1795 1796 1797 1798 1799
	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;
1800
	if (addr) {
1801
		err = move_addr_to_kernel(addr, addr_len, &address);
L
Linus Torvalds 已提交
1802 1803
		if (err < 0)
			goto out_put;
1804
		msg.msg_name = (struct sockaddr *)&address;
1805
		msg.msg_namelen = addr_len;
L
Linus Torvalds 已提交
1806 1807 1808 1809 1810 1811
	}
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
	msg.msg_flags = flags;
	err = sock_sendmsg(sock, &msg, len);

1812
out_put:
1813
	fput_light(sock->file, fput_needed);
1814
out:
L
Linus Torvalds 已提交
1815 1816 1817 1818
	return err;
}

/*
1819
 *	Send a datagram down a socket.
L
Linus Torvalds 已提交
1820 1821
 */

1822
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1823
		unsigned int, flags)
L
Linus Torvalds 已提交
1824 1825 1826 1827 1828
{
	return sys_sendto(fd, buff, len, flags, NULL, 0);
}

/*
1829
 *	Receive a frame from the socket and optionally record the address of the
L
Linus Torvalds 已提交
1830 1831 1832 1833
 *	sender. We verify the buffers are writable and if needed move the
 *	sender address from kernel to user space.
 */

1834
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1835
		unsigned int, flags, struct sockaddr __user *, addr,
1836
		int __user *, addr_len)
L
Linus Torvalds 已提交
1837 1838 1839 1840
{
	struct socket *sock;
	struct iovec iov;
	struct msghdr msg;
1841
	struct sockaddr_storage address;
1842
	int err, err2;
1843 1844
	int fput_needed;

1845 1846
	if (size > INT_MAX)
		size = INT_MAX;
1847
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1848
	if (!sock)
1849
		goto out;
L
Linus Torvalds 已提交
1850

1851 1852 1853 1854 1855 1856
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_iovlen = 1;
	msg.msg_iov = &iov;
	iov.iov_len = size;
	iov.iov_base = ubuf;
1857 1858 1859 1860
	/* Save some cycles and don't copy the address if not needed */
	msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
	/* We assume all kernel code knows the size of sockaddr_storage */
	msg.msg_namelen = 0;
L
Linus Torvalds 已提交
1861 1862
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
1863
	err = sock_recvmsg(sock, &msg, size, flags);
L
Linus Torvalds 已提交
1864

1865
	if (err >= 0 && addr != NULL) {
1866
		err2 = move_addr_to_user(&address,
1867
					 msg.msg_namelen, addr, addr_len);
1868 1869
		if (err2 < 0)
			err = err2;
L
Linus Torvalds 已提交
1870
	}
1871 1872

	fput_light(sock->file, fput_needed);
1873
out:
L
Linus Torvalds 已提交
1874 1875 1876 1877
	return err;
}

/*
1878
 *	Receive a datagram from a socket.
L
Linus Torvalds 已提交
1879 1880
 */

1881
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1882
			 unsigned int flags)
L
Linus Torvalds 已提交
1883 1884 1885 1886 1887 1888 1889 1890 1891
{
	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.
 */

1892 1893
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int, optlen)
L
Linus Torvalds 已提交
1894
{
1895
	int err, fput_needed;
L
Linus Torvalds 已提交
1896 1897 1898 1899
	struct socket *sock;

	if (optlen < 0)
		return -EINVAL;
1900 1901 1902 1903

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
		err = security_socket_setsockopt(sock, level, optname);
1904 1905
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1906 1907

		if (level == SOL_SOCKET)
1908 1909 1910
			err =
			    sock_setsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1911
		else
1912 1913 1914
			err =
			    sock->ops->setsockopt(sock, level, optname, optval,
						  optlen);
1915 1916
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1917 1918 1919 1920 1921 1922 1923 1924 1925
	}
	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.
 */

1926 1927
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int __user *, optlen)
L
Linus Torvalds 已提交
1928
{
1929
	int err, fput_needed;
L
Linus Torvalds 已提交
1930 1931
	struct socket *sock;

1932 1933
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
1934 1935 1936
		err = security_socket_getsockopt(sock, level, optname);
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1937 1938

		if (level == SOL_SOCKET)
1939 1940 1941
			err =
			    sock_getsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1942
		else
1943 1944 1945
			err =
			    sock->ops->getsockopt(sock, level, optname, optval,
						  optlen);
1946 1947
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1948 1949 1950 1951 1952 1953 1954 1955
	}
	return err;
}

/*
 *	Shutdown a socket.
 */

1956
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
L
Linus Torvalds 已提交
1957
{
1958
	int err, fput_needed;
L
Linus Torvalds 已提交
1959 1960
	struct socket *sock;

1961 1962
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1963
		err = security_socket_shutdown(sock, how);
1964 1965 1966
		if (!err)
			err = sock->ops->shutdown(sock, how);
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1967 1968 1969 1970
	}
	return err;
}

1971
/* A couple of helpful macros for getting the address of the 32/64 bit
L
Linus Torvalds 已提交
1972 1973 1974 1975 1976 1977
 * 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)

1978 1979 1980 1981 1982
struct used_address {
	struct sockaddr_storage name;
	unsigned int name_len;
};

1983 1984 1985 1986 1987 1988
static int copy_msghdr_from_user(struct msghdr *kmsg,
				 struct msghdr __user *umsg)
{
	if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
		return -EFAULT;
	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1989
		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1990 1991 1992
	return 0;
}

1993
static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
1994
			 struct msghdr *msg_sys, unsigned int flags,
1995
			 struct used_address *used_address)
L
Linus Torvalds 已提交
1996
{
1997 1998
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
1999
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
2000
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2001
	unsigned char ctl[sizeof(struct cmsghdr) + 20]
2002 2003
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));
	/* 20 is size of ipv6_pktinfo */
L
Linus Torvalds 已提交
2004
	unsigned char *ctl_buf = ctl;
E
Eric Dumazet 已提交
2005
	int err, ctl_len, total_len;
2006

L
Linus Torvalds 已提交
2007 2008
	err = -EFAULT;
	if (MSG_CMSG_COMPAT & flags) {
2009
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
2010
			return -EFAULT;
2011 2012 2013 2014 2015
	} else {
		err = copy_msghdr_from_user(msg_sys, msg);
		if (err)
			return err;
	}
L
Linus Torvalds 已提交
2016

2017
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
E
Eric Dumazet 已提交
2018 2019 2020 2021 2022 2023
		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
2024
		if (!iov)
2025
			goto out;
L
Linus Torvalds 已提交
2026 2027 2028 2029
	}

	/* This will also move the address data into kernel space */
	if (MSG_CMSG_COMPAT & flags) {
2030
		err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
L
Linus Torvalds 已提交
2031
	} else
2032
		err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2033
	if (err < 0)
L
Linus Torvalds 已提交
2034 2035 2036 2037 2038
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

2039
	if (msg_sys->msg_controllen > INT_MAX)
L
Linus Torvalds 已提交
2040
		goto out_freeiov;
2041
	ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
2042
	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2043
		err =
2044
		    cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2045
						     sizeof(ctl));
L
Linus Torvalds 已提交
2046 2047
		if (err)
			goto out_freeiov;
2048 2049
		ctl_buf = msg_sys->msg_control;
		ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
2050
	} else if (ctl_len) {
2051
		if (ctl_len > sizeof(ctl)) {
L
Linus Torvalds 已提交
2052
			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2053
			if (ctl_buf == NULL)
L
Linus Torvalds 已提交
2054 2055 2056 2057
				goto out_freeiov;
		}
		err = -EFAULT;
		/*
2058
		 * Careful! Before this, msg_sys->msg_control contains a user pointer.
L
Linus Torvalds 已提交
2059 2060 2061
		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
		 * checking falls down on this.
		 */
2062
		if (copy_from_user(ctl_buf,
2063
				   (void __user __force *)msg_sys->msg_control,
2064
				   ctl_len))
L
Linus Torvalds 已提交
2065
			goto out_freectl;
2066
		msg_sys->msg_control = ctl_buf;
L
Linus Torvalds 已提交
2067
	}
2068
	msg_sys->msg_flags = flags;
L
Linus Torvalds 已提交
2069 2070

	if (sock->file->f_flags & O_NONBLOCK)
2071
		msg_sys->msg_flags |= MSG_DONTWAIT;
2072 2073 2074 2075 2076 2077
	/*
	 * 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.
	 */
2078 2079 2080
	if (used_address && msg_sys->msg_name &&
	    used_address->name_len == msg_sys->msg_namelen &&
	    !memcmp(&used_address->name, msg_sys->msg_name,
2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091
		    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;
2092 2093 2094
		if (msg_sys->msg_name)
			memcpy(&used_address->name, msg_sys->msg_name,
			       used_address->name_len);
2095
	}
L
Linus Torvalds 已提交
2096 2097

out_freectl:
2098
	if (ctl_buf != ctl)
L
Linus Torvalds 已提交
2099 2100 2101
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
E
Eric Dumazet 已提交
2102
		kfree(iov);
2103 2104 2105 2106 2107 2108 2109 2110
out:
	return err;
}

/*
 *	BSD sendmsg interface
 */

2111
long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
2112 2113 2114
{
	int fput_needed, err;
	struct msghdr msg_sys;
2115 2116 2117
	struct socket *sock;

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2118 2119 2120
	if (!sock)
		goto out;

2121
	err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2122

2123
	fput_light(sock->file, fput_needed);
2124
out:
L
Linus Torvalds 已提交
2125 2126 2127
	return err;
}

2128 2129 2130 2131 2132 2133 2134
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
{
	if (flags & MSG_CMSG_COMPAT)
		return -EINVAL;
	return __sys_sendmsg(fd, msg, flags);
}

2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
/*
 *	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;
2147
	struct used_address used_address;
2148

2149 2150
	if (vlen > UIO_MAXIOV)
		vlen = UIO_MAXIOV;
2151 2152 2153 2154 2155 2156 2157

	datagrams = 0;

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

2158
	used_address.name_len = UINT_MAX;
2159 2160
	entry = mmsg;
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2161
	err = 0;
2162 2163 2164

	while (datagrams < vlen) {
		if (MSG_CMSG_COMPAT & flags) {
2165 2166
			err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
					     &msg_sys, flags, &used_address);
2167 2168 2169 2170 2171
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
2172 2173 2174
			err = ___sys_sendmsg(sock,
					     (struct msghdr __user *)entry,
					     &msg_sys, flags, &used_address);
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

		if (err)
			break;
		++datagrams;
	}

	fput_light(sock->file, fput_needed);

2188 2189
	/* We only return an error if no datagrams were able to be sent */
	if (datagrams != 0)
2190 2191 2192 2193 2194 2195 2196 2197
		return datagrams;

	return err;
}

SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
		unsigned int, vlen, unsigned int, flags)
{
2198 2199
	if (flags & MSG_CMSG_COMPAT)
		return -EINVAL;
2200 2201 2202
	return __sys_sendmmsg(fd, mmsg, vlen, flags);
}

2203
static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2204
			 struct msghdr *msg_sys, unsigned int flags, int nosec)
L
Linus Torvalds 已提交
2205
{
2206 2207
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
Linus Torvalds 已提交
2208
	struct iovec iovstack[UIO_FASTIOV];
2209
	struct iovec *iov = iovstack;
L
Linus Torvalds 已提交
2210
	unsigned long cmsg_ptr;
E
Eric Dumazet 已提交
2211
	int err, total_len, len;
L
Linus Torvalds 已提交
2212 2213

	/* kernel mode address */
2214
	struct sockaddr_storage addr;
L
Linus Torvalds 已提交
2215 2216 2217 2218

	/* user mode address pointers */
	struct sockaddr __user *uaddr;
	int __user *uaddr_len;
2219

L
Linus Torvalds 已提交
2220
	if (MSG_CMSG_COMPAT & flags) {
2221
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
2222
			return -EFAULT;
2223 2224 2225 2226 2227
	} else {
		err = copy_msghdr_from_user(msg_sys, msg);
		if (err)
			return err;
	}
L
Linus Torvalds 已提交
2228

2229
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
E
Eric Dumazet 已提交
2230 2231 2232 2233 2234 2235
		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
2236
		if (!iov)
2237
			goto out;
L
Linus Torvalds 已提交
2238 2239
	}

2240 2241
	/* Save the user-mode address (verify_iovec will change the
	 * kernel msghdr to use the kernel address space)
L
Linus Torvalds 已提交
2242
	 */
2243
	uaddr = (__force void __user *)msg_sys->msg_name;
L
Linus Torvalds 已提交
2244
	uaddr_len = COMPAT_NAMELEN(msg);
2245
	if (MSG_CMSG_COMPAT & flags)
2246
		err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2247
	else
2248
		err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
L
Linus Torvalds 已提交
2249 2250
	if (err < 0)
		goto out_freeiov;
2251
	total_len = err;
L
Linus Torvalds 已提交
2252

2253 2254
	cmsg_ptr = (unsigned long)msg_sys->msg_control;
	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2255

2256 2257 2258
	/* We assume all kernel code knows the size of sockaddr_storage */
	msg_sys->msg_namelen = 0;

L
Linus Torvalds 已提交
2259 2260
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
2261 2262
	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
							  total_len, flags);
L
Linus Torvalds 已提交
2263 2264 2265 2266 2267
	if (err < 0)
		goto out_freeiov;
	len = err;

	if (uaddr != NULL) {
2268
		err = move_addr_to_user(&addr,
2269
					msg_sys->msg_namelen, uaddr,
2270
					uaddr_len);
L
Linus Torvalds 已提交
2271 2272 2273
		if (err < 0)
			goto out_freeiov;
	}
2274
	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2275
			 COMPAT_FLAGS(msg));
L
Linus Torvalds 已提交
2276 2277 2278
	if (err)
		goto out_freeiov;
	if (MSG_CMSG_COMPAT & flags)
2279
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2280 2281
				 &msg_compat->msg_controllen);
	else
2282
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2283 2284 2285 2286 2287 2288 2289
				 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

out_freeiov:
	if (iov != iovstack)
E
Eric Dumazet 已提交
2290
		kfree(iov);
2291 2292 2293 2294 2295 2296 2297 2298
out:
	return err;
}

/*
 *	BSD recvmsg interface
 */

2299
long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
2300 2301 2302
{
	int fput_needed, err;
	struct msghdr msg_sys;
2303 2304 2305
	struct socket *sock;

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2306 2307 2308
	if (!sock)
		goto out;

2309
	err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2310

2311
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
2312 2313 2314 2315
out:
	return err;
}

2316 2317 2318 2319 2320 2321 2322 2323
SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
		unsigned int, flags)
{
	if (flags & MSG_CMSG_COMPAT)
		return -EINVAL;
	return __sys_recvmsg(fd, msg, flags);
}

2324 2325 2326 2327 2328 2329 2330 2331 2332 2333
/*
 *     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;
2334
	struct compat_mmsghdr __user *compat_entry;
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
	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;
2354
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2355 2356 2357 2358 2359

	while (datagrams < vlen) {
		/*
		 * No need to ask LSM for more than the first datagram.
		 */
2360
		if (MSG_CMSG_COMPAT & flags) {
2361 2362 2363
			err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
					     &msg_sys, flags & ~MSG_WAITFORONE,
					     datagrams);
2364 2365 2366 2367 2368
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
2369 2370 2371 2372
			err = ___sys_recvmsg(sock,
					     (struct msghdr __user *)entry,
					     &msg_sys, flags & ~MSG_WAITFORONE,
					     datagrams);
2373 2374 2375 2376 2377 2378
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

2379 2380 2381 2382
		if (err)
			break;
		++datagrams;

2383 2384 2385 2386
		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
		if (flags & MSG_WAITFORONE)
			flags |= MSG_DONTWAIT;

2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
		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
2407

2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438
	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;

2439 2440 2441
	if (flags & MSG_CMSG_COMPAT)
		return -EINVAL;

2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457
	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
2458 2459
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
2460
static const unsigned char nargs[21] = {
2461 2462 2463
	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),
2464
	AL(4), AL(5), AL(4)
2465 2466
};

L
Linus Torvalds 已提交
2467 2468 2469
#undef AL

/*
2470
 *	System call vectors.
L
Linus Torvalds 已提交
2471 2472 2473
 *
 *	Argument checking cleaned up. Saved 20% in size.
 *  This function doesn't need to set the kernel lock because
2474
 *  it is set by the callees.
L
Linus Torvalds 已提交
2475 2476
 */

2477
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
L
Linus Torvalds 已提交
2478
{
2479
	unsigned long a[AUDITSC_ARGS];
2480
	unsigned long a0, a1;
L
Linus Torvalds 已提交
2481
	int err;
2482
	unsigned int len;
L
Linus Torvalds 已提交
2483

2484
	if (call < 1 || call > SYS_SENDMMSG)
L
Linus Torvalds 已提交
2485 2486
		return -EINVAL;

2487 2488 2489 2490
	len = nargs[call];
	if (len > sizeof(a))
		return -EINVAL;

L
Linus Torvalds 已提交
2491
	/* copy_from_user should be SMP safe. */
2492
	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
2493
		return -EFAULT;
2494

2495 2496 2497
	err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
	if (err)
		return err;
2498

2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515
	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
2516 2517
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], 0);
2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560
		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;
2561 2562 2563
	case SYS_SENDMMSG:
		err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
		break;
2564 2565 2566
	case SYS_RECVMSG:
		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
2567 2568 2569 2570
	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
2571 2572 2573
	case SYS_ACCEPT4:
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], a[3]);
U
Ulrich Drepper 已提交
2574
		break;
2575 2576 2577
	default:
		err = -EINVAL;
		break;
L
Linus Torvalds 已提交
2578 2579 2580 2581
	}
	return err;
}

2582
#endif				/* __ARCH_WANT_SYS_SOCKETCALL */
L
Linus Torvalds 已提交
2583

2584 2585 2586 2587
/**
 *	sock_register - add a socket protocol handler
 *	@ops: description of protocol
 *
L
Linus Torvalds 已提交
2588 2589
 *	This function is called by a protocol handler that wants to
 *	advertise its address family, and have it linked into the
2590 2591
 *	socket interface. The value ops->family coresponds to the
 *	socket system call protocol family.
L
Linus Torvalds 已提交
2592
 */
2593
int sock_register(const struct net_proto_family *ops)
L
Linus Torvalds 已提交
2594 2595 2596 2597
{
	int err;

	if (ops->family >= NPROTO) {
2598 2599
		printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
		       NPROTO);
L
Linus Torvalds 已提交
2600 2601
		return -ENOBUFS;
	}
2602 2603

	spin_lock(&net_family_lock);
E
Eric Dumazet 已提交
2604 2605
	if (rcu_dereference_protected(net_families[ops->family],
				      lockdep_is_held(&net_family_lock)))
2606 2607
		err = -EEXIST;
	else {
2608
		rcu_assign_pointer(net_families[ops->family], ops);
L
Linus Torvalds 已提交
2609 2610
		err = 0;
	}
2611 2612
	spin_unlock(&net_family_lock);

2613
	printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
L
Linus Torvalds 已提交
2614 2615
	return err;
}
2616
EXPORT_SYMBOL(sock_register);
L
Linus Torvalds 已提交
2617

2618 2619 2620 2621
/**
 *	sock_unregister - remove a protocol handler
 *	@family: protocol family to remove
 *
L
Linus Torvalds 已提交
2622 2623
 *	This function is called by a protocol handler that wants to
 *	remove its address family, and have it unlinked from the
2624 2625 2626 2627 2628 2629
 *	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
2630
 */
2631
void sock_unregister(int family)
L
Linus Torvalds 已提交
2632
{
2633
	BUG_ON(family < 0 || family >= NPROTO);
L
Linus Torvalds 已提交
2634

2635
	spin_lock(&net_family_lock);
2636
	RCU_INIT_POINTER(net_families[family], NULL);
2637 2638 2639 2640
	spin_unlock(&net_family_lock);

	synchronize_rcu();

2641
	printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
L
Linus Torvalds 已提交
2642
}
2643
EXPORT_SYMBOL(sock_unregister);
L
Linus Torvalds 已提交
2644

2645
static int __init sock_init(void)
L
Linus Torvalds 已提交
2646
{
N
Nick Piggin 已提交
2647
	int err;
2648 2649 2650 2651 2652 2653
	/*
	 *      Initialize the network sysctl infrastructure.
	 */
	err = net_sysctl_init();
	if (err)
		goto out;
N
Nick Piggin 已提交
2654

L
Linus Torvalds 已提交
2655
	/*
2656
	 *      Initialize skbuff SLAB cache
L
Linus Torvalds 已提交
2657 2658 2659 2660
	 */
	skb_init();

	/*
2661
	 *      Initialize the protocols module.
L
Linus Torvalds 已提交
2662 2663 2664
	 */

	init_inodecache();
N
Nick Piggin 已提交
2665 2666 2667 2668

	err = register_filesystem(&sock_fs_type);
	if (err)
		goto out_fs;
L
Linus Torvalds 已提交
2669
	sock_mnt = kern_mount(&sock_fs_type);
N
Nick Piggin 已提交
2670 2671 2672 2673
	if (IS_ERR(sock_mnt)) {
		err = PTR_ERR(sock_mnt);
		goto out_mount;
	}
2674 2675

	/* The real protocol initialization is performed in later initcalls.
L
Linus Torvalds 已提交
2676 2677 2678
	 */

#ifdef CONFIG_NETFILTER
2679 2680 2681
	err = netfilter_init();
	if (err)
		goto out;
L
Linus Torvalds 已提交
2682
#endif
2683

2684 2685 2686 2687
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
	skb_timestamping_init();
#endif

N
Nick Piggin 已提交
2688 2689 2690 2691 2692 2693 2694
out:
	return err;

out_mount:
	unregister_filesystem(&sock_fs_type);
out_fs:
	goto out;
L
Linus Torvalds 已提交
2695 2696
}

2697 2698
core_initcall(sock_init);	/* early initcall */

L
Linus Torvalds 已提交
2699 2700 2701 2702 2703 2704
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
	int cpu;
	int counter = 0;

2705
	for_each_possible_cpu(cpu)
2706
	    counter += per_cpu(sockets_in_use, cpu);
L
Linus Torvalds 已提交
2707 2708 2709 2710 2711 2712 2713

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

	seq_printf(seq, "sockets: used %d\n", counter);
}
2714
#endif				/* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2715

2716
#ifdef CONFIG_COMPAT
2717
static int do_siocgstamp(struct net *net, struct socket *sock,
2718
			 unsigned int cmd, void __user *up)
2719 2720 2721 2722 2723 2724
{
	mm_segment_t old_fs = get_fs();
	struct timeval ktv;
	int err;

	set_fs(KERNEL_DS);
2725
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2726
	set_fs(old_fs);
2727
	if (!err)
2728
		err = compat_put_timeval(&ktv, up);
2729

2730 2731 2732
	return err;
}

2733
static int do_siocgstampns(struct net *net, struct socket *sock,
2734
			   unsigned int cmd, void __user *up)
2735 2736 2737 2738 2739 2740
{
	mm_segment_t old_fs = get_fs();
	struct timespec kts;
	int err;

	set_fs(KERNEL_DS);
2741
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2742
	set_fs(old_fs);
2743
	if (!err)
2744
		err = compat_put_timespec(&kts, up);
2745

2746 2747 2748
	return err;
}

2749
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2750 2751 2752 2753 2754
{
	struct ifreq __user *uifr;
	int err;

	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2755
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2756 2757
		return -EFAULT;

2758
	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2759 2760 2761
	if (err)
		return err;

2762
	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2763 2764 2765 2766 2767
		return -EFAULT;

	return 0;
}

2768
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2769
{
2770
	struct compat_ifconf ifc32;
2771 2772
	struct ifconf ifc;
	struct ifconf __user *uifc;
2773
	struct compat_ifreq __user *ifr32;
2774 2775 2776 2777
	struct ifreq __user *ifr;
	unsigned int i, j;
	int err;

2778
	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2779 2780
		return -EFAULT;

2781
	memset(&ifc, 0, sizeof(ifc));
2782 2783 2784 2785 2786 2787
	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 {
2788 2789
		size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
			sizeof(struct ifreq);
2790 2791 2792 2793
		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);
2794
		for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2795
			if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2796 2797 2798 2799 2800 2801 2802 2803
				return -EFAULT;
			ifr++;
			ifr32++;
		}
	}
	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
		return -EFAULT;

2804
	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2805 2806 2807 2808 2809 2810 2811 2812 2813
	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;
2814 2815 2816
	     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)))
2817 2818 2819 2820 2821 2822 2823 2824 2825 2826
			return -EFAULT;
		ifr32++;
		ifr++;
	}

	if (ifc32.ifcbuf == 0) {
		/* Translate from 64-bit structure multiple to
		 * a 32-bit one.
		 */
		i = ifc.ifc_len;
2827
		i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2828 2829 2830 2831
		ifc32.ifc_len = i;
	} else {
		ifc32.ifc_len = i;
	}
2832
	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2833 2834 2835 2836 2837
		return -EFAULT;

	return 0;
}

2838
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2839
{
2840 2841 2842 2843
	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;
2844
	struct ifreq __user *ifr;
2845 2846
	u32 rule_cnt = 0, actual_rule_cnt;
	u32 ethcmd;
2847
	u32 data;
2848
	int ret;
2849

2850 2851
	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
		return -EFAULT;
2852

2853 2854 2855
	compat_rxnfc = compat_ptr(data);

	if (get_user(ethcmd, &compat_rxnfc->cmd))
2856 2857
		return -EFAULT;

2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
	/* 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:
2875
	case ETHTOOL_SRXCLSRLINS:
2876 2877 2878 2879 2880 2881 2882 2883 2884
		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);
S
Stephen Hemminger 已提交
2885
	rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2886 2887

	if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2888 2889
		return -EFAULT;

2890 2891
	if (put_user(convert_in ? rxnfc : compat_ptr(data),
		     &ifr->ifr_ifru.ifru_data))
2892 2893
		return -EFAULT;

2894
	if (convert_in) {
2895
		/* We expect there to be holes between fs.m_ext and
2896 2897
		 * fs.ring_cookie and at the end of fs, but nowhere else.
		 */
2898 2899 2900 2901
		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));
2902 2903 2904 2905 2906 2907 2908
		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,
S
Stephen Hemminger 已提交
2909 2910
				 (void __user *)(&rxnfc->fs.m_ext + 1) -
				 (void __user *)rxnfc) ||
2911 2912
		    copy_in_user(&rxnfc->fs.ring_cookie,
				 &compat_rxnfc->fs.ring_cookie,
S
Stephen Hemminger 已提交
2913 2914
				 (void __user *)(&rxnfc->fs.location + 1) -
				 (void __user *)&rxnfc->fs.ring_cookie) ||
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925
		    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,
S
Stephen Hemminger 已提交
2926 2927
				 (const void __user *)(&rxnfc->fs.m_ext + 1) -
				 (const void __user *)rxnfc) ||
2928 2929
		    copy_in_user(&compat_rxnfc->fs.ring_cookie,
				 &rxnfc->fs.ring_cookie,
S
Stephen Hemminger 已提交
2930 2931
				 (const void __user *)(&rxnfc->fs.location + 1) -
				 (const void __user *)&rxnfc->fs.ring_cookie) ||
2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956
		    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;
2957 2958
}

2959 2960 2961 2962 2963 2964
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2965
	uifr = compat_alloc_user_space(sizeof(*uifr));
2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979
	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);
}

2980 2981
static int bond_ioctl(struct net *net, unsigned int cmd,
			 struct compat_ifreq __user *ifr32)
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991
{
	struct ifreq kifr;
	mm_segment_t old_fs;
	int err;

	switch (cmd) {
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
2992
		if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2993 2994 2995
			return -EFAULT;

		old_fs = get_fs();
2996
		set_fs(KERNEL_DS);
2997 2998
		err = dev_ioctl(net, cmd,
				(struct ifreq __user __force *) &kifr);
2999
		set_fs(old_fs);
3000 3001 3002

		return err;
	default:
3003
		return -ENOIOCTLCMD;
3004
	}
3005 3006
}

3007 3008
/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
3009
				 struct compat_ifreq __user *u_ifreq32)
3010 3011 3012 3013 3014 3015 3016 3017 3018
{
	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;
3019
	if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
3020 3021 3022 3023 3024 3025 3026 3027
		return -EFAULT;
	data64 = compat_ptr(data32);

	u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));

	if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
			 IFNAMSIZ))
		return -EFAULT;
3028
	if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
3029 3030
		return -EFAULT;

3031
	return dev_ioctl(net, cmd, u_ifreq64);
3032 3033
}

3034 3035
static int dev_ifsioc(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_ifreq __user *uifr32)
3036
{
3037
	struct ifreq __user *uifr;
3038 3039
	int err;

3040 3041 3042 3043 3044 3045
	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);

3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
	if (!err) {
		switch (cmd) {
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFINDEX:
		case SIOCGIFADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFNETMASK:
3058
		case SIOCGIFPFLAGS:
3059
		case SIOCGIFTXQLEN:
3060 3061
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
3062
			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3063 3064 3065 3066 3067 3068 3069
				err = -EFAULT;
			break;
		}
	}
	return err;
}

3070 3071 3072 3073 3074 3075 3076 3077 3078 3079
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));
3080 3081 3082 3083 3084 3085
	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);
3086 3087 3088 3089
	if (err)
		return -EFAULT;

	old_fs = get_fs();
3090
	set_fs(KERNEL_DS);
3091
	err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
3092
	set_fs(old_fs);
3093 3094 3095

	if (cmd == SIOCGIFMAP && !err) {
		err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3096 3097 3098 3099 3100 3101
		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);
3102 3103 3104 3105 3106 3107
		if (err)
			err = -EFAULT;
	}
	return err;
}

3108
struct rtentry32 {
3109
	u32		rt_pad1;
3110 3111 3112
	struct sockaddr rt_dst;         /* target address               */
	struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
	struct sockaddr rt_genmask;     /* target network mask (IP)     */
3113 3114 3115 3116 3117 3118 3119
	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! */
3120
	/* char * */ u32 rt_dev;        /* forcing the device at add    */
3121 3122
	u32		rt_mtu;         /* per route MTU/Window         */
	u32		rt_window;      /* Window clamping              */
3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
	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;
};

3139 3140
static int routing_ioctl(struct net *net, struct socket *sock,
			 unsigned int cmd, void __user *argp)
3141 3142 3143 3144 3145 3146 3147 3148 3149
{
	int ret;
	void *r = NULL;
	struct in6_rtmsg r6;
	struct rtentry r4;
	char devname[16];
	u32 rtdev;
	mm_segment_t old_fs = get_fs();

3150 3151
	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
		struct in6_rtmsg32 __user *ur6 = argp;
3152
		ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3153
			3 * sizeof(struct in6_addr));
3154 3155 3156 3157 3158 3159 3160
		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));
3161 3162 3163

		r = (void *) &r6;
	} else { /* ipv4 */
3164
		struct rtentry32 __user *ur4 = argp;
3165
		ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3166
					3 * sizeof(struct sockaddr));
3167 3168 3169 3170 3171 3172
		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));
3173
		if (rtdev) {
3174
			ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3175 3176
			r4.rt_dev = (char __user __force *)devname;
			devname[15] = 0;
3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187
		} else
			r4.rt_dev = NULL;

		r = (void *) &r4;
	}

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

3188
	set_fs(KERNEL_DS);
3189
	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3190
	set_fs(old_fs);
3191 3192 3193 3194 3195 3196 3197

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
3198
 * use compatible ioctls
3199
 */
3200
static int old_bridge_ioctl(compat_ulong_t __user *argp)
3201
{
3202
	compat_ulong_t tmp;
3203

3204
	if (get_user(tmp, argp))
3205 3206 3207 3208 3209 3210
		return -EFAULT;
	if (tmp == BRCTL_GET_VERSION)
		return BRCTL_VERSION + 1;
	return -EINVAL;
}

3211 3212 3213 3214 3215 3216
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);
3217

3218
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3219
		return compat_ifr_data_ioctl(net, cmd, argp);
3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230

	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);
3231 3232
	case SIOCWANDEV:
		return compat_siocwandev(net, argp);
3233 3234 3235
	case SIOCGIFMAP:
	case SIOCSIFMAP:
		return compat_sioc_ifmap(net, cmd, argp);
3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	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);
3248 3249
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
3250
	case SIOCSHWTSTAMP:
3251
	case SIOCGHWTSTAMP:
3252
		return compat_ifr_data_ioctl(net, cmd, argp);
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 3289 3290 3291 3292 3293 3294

	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:
3295 3296 3297 3298
	case SIOCSIFNAME:
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
3299
		return dev_ifsioc(net, sock, cmd, argp);
3300

3301 3302 3303 3304
	case SIOCSARP:
	case SIOCGARP:
	case SIOCDARP:
	case SIOCATMARK:
3305 3306 3307
		return sock_do_ioctl(net, sock, cmd, arg);
	}

3308 3309
	return -ENOIOCTLCMD;
}
3310

3311
static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3312
			      unsigned long arg)
3313 3314 3315
{
	struct socket *sock = file->private_data;
	int ret = -ENOIOCTLCMD;
3316 3317 3318 3319 3320
	struct sock *sk;
	struct net *net;

	sk = sock->sk;
	net = sock_net(sk);
3321 3322 3323 3324

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

3325 3326 3327 3328
	if (ret == -ENOIOCTLCMD &&
	    (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
		ret = compat_wext_handle_ioctl(net, cmd, arg);

3329 3330 3331
	if (ret == -ENOIOCTLCMD)
		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);

3332 3333 3334 3335
	return ret;
}
#endif

3336 3337 3338 3339
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
	return sock->ops->bind(sock, addr, addrlen);
}
3340
EXPORT_SYMBOL(kernel_bind);
3341 3342 3343 3344 3345

int kernel_listen(struct socket *sock, int backlog)
{
	return sock->ops->listen(sock, backlog);
}
3346
EXPORT_SYMBOL(kernel_listen);
3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360

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);
3361
		*newsock = NULL;
3362 3363 3364 3365
		goto done;
	}

	(*newsock)->ops = sock->ops;
3366
	__module_get((*newsock)->ops->owner);
3367 3368 3369 3370

done:
	return err;
}
3371
EXPORT_SYMBOL(kernel_accept);
3372 3373

int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3374
		   int flags)
3375 3376 3377
{
	return sock->ops->connect(sock, addr, addrlen, flags);
}
3378
EXPORT_SYMBOL(kernel_connect);
3379 3380 3381 3382 3383 3384

int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 0);
}
3385
EXPORT_SYMBOL(kernel_getsockname);
3386 3387 3388 3389 3390 3391

int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 1);
}
3392
EXPORT_SYMBOL(kernel_getpeername);
3393 3394 3395 3396 3397

int kernel_getsockopt(struct socket *sock, int level, int optname,
			char *optval, int *optlen)
{
	mm_segment_t oldfs = get_fs();
3398 3399
	char __user *uoptval;
	int __user *uoptlen;
3400 3401
	int err;

3402 3403 3404
	uoptval = (char __user __force *) optval;
	uoptlen = (int __user __force *) optlen;

3405 3406
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3407
		err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3408
	else
3409 3410
		err = sock->ops->getsockopt(sock, level, optname, uoptval,
					    uoptlen);
3411 3412 3413
	set_fs(oldfs);
	return err;
}
3414
EXPORT_SYMBOL(kernel_getsockopt);
3415 3416

int kernel_setsockopt(struct socket *sock, int level, int optname,
3417
			char *optval, unsigned int optlen)
3418 3419
{
	mm_segment_t oldfs = get_fs();
3420
	char __user *uoptval;
3421 3422
	int err;

3423 3424
	uoptval = (char __user __force *) optval;

3425 3426
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3427
		err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3428
	else
3429
		err = sock->ops->setsockopt(sock, level, optname, uoptval,
3430 3431 3432 3433
					    optlen);
	set_fs(oldfs);
	return err;
}
3434
EXPORT_SYMBOL(kernel_setsockopt);
3435 3436 3437 3438 3439 3440 3441 3442 3443

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);
}
3444
EXPORT_SYMBOL(kernel_sendpage);
3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456

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;
}
3457
EXPORT_SYMBOL(kernel_sock_ioctl);
3458

3459 3460 3461 3462 3463
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
	return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);