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/ptp_classify.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)
{
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	struct fd f = fdget(fd);
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	struct socket *sock;

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	*err = -EBADF;
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	if (f.file) {
		sock = sock_from_file(f.file, err);
		if (likely(sock)) {
			*fput_needed = f.flags;
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			return sock;
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		}
		fdput(f);
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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,
575
	.llseek = noop_llseek,
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576 577 578 579 580 581 582 583
};

/**
 *	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
584
 *	an inode not a file.
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 */
586

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void sock_release(struct socket *sock)
{
	if (sock->ops) {
		struct module *owner = sock->ops->owner;

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

597
	if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
598
		pr_err("%s: fasync list not empty!\n", __func__);
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600 601 602
	if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
		return;

603
	this_cpu_sub(sockets_in_use, 1);
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	if (!sock->file) {
		iput(SOCK_INODE(sock));
		return;
	}
608
	sock->file = NULL;
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}
610
EXPORT_SYMBOL(sock_release);
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611

612
void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
613
{
614
	*tx_flags = 0;
615
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
616
		*tx_flags |= SKBTX_HW_TSTAMP;
617
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
618
		*tx_flags |= SKBTX_SW_TSTAMP;
619 620
	if (sock_flag(sk, SOCK_WIFI_STATUS))
		*tx_flags |= SKBTX_WIFI_STATUS;
621 622 623
}
EXPORT_SYMBOL(sock_tx_timestamp);

624 625
static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
				       struct msghdr *msg, size_t size)
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{
	struct sock_iocb *si = kiocb_to_siocb(iocb);

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

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

637 638 639 640 641 642 643 644
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;
}
658
EXPORT_SYMBOL(sock_sendmsg);
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660
static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
661 662 663 664 665 666 667 668 669 670 671 672 673
{
	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
	 */
685
	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;
}
691
EXPORT_SYMBOL(kernel_sendmsg);
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693 694 695 696 697 698
/*
 * 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)
{
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
	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 {
717
			skb_get_timestampns(skb, &ts[0]);
718
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
719
				 sizeof(ts[0]), &ts[0]);
720 721 722 723 724
		}
	}


	memset(ts, 0, sizeof(ts));
725 726
	if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
	    ktime_to_timespec_cond(skb->tstamp, ts + 0))
727 728 729
		empty = 0;
	if (shhwtstamps) {
		if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
730
		    ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
731 732
			empty = 0;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
733
		    ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
734
			empty = 0;
735
	}
736 737 738
	if (!empty)
		put_cmsg(msg, SOL_SOCKET,
			 SCM_TIMESTAMPING, sizeof(ts), &ts);
739
}
740 741
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);

742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
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
758 759
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
				   struct sk_buff *skb)
760 761 762 763 764 765
{
	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
		put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
			sizeof(__u32), &skb->dropcount);
}

766
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
767 768 769 770 771
	struct sk_buff *skb)
{
	sock_recv_timestamp(msg, sk, skb);
	sock_recv_drops(msg, sk, skb);
}
772
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
773

774 775
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);
}

788 789 790 791 792 793 794 795
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);
}

796
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
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		 size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

803
	init_sync_kiocb(&iocb, NULL);
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	iocb.private = &siocb;
	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
810
EXPORT_SYMBOL(sock_recvmsg);
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811

812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
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;
}

827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
/**
 * 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.
 */
842 843
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
		   struct kvec *vec, size_t num, size_t size, int flags)
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844 845 846 847 848 849 850 851 852
{
	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
	 */
853
	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
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	result = sock_recvmsg(sock, msg, size, flags);
	set_fs(oldfs);
	return result;
}
858
EXPORT_SYMBOL(kernel_recvmsg);
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859

860 861
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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862 863 864 865
{
	struct socket *sock;
	int flags;

866 867
	sock = file->private_data;

868 869 870
	flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
	/* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
	flags |= more;
871

872
	return kernel_sendpage(sock, page, offset, size, flags);
873
}
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874

J
Jens Axboe 已提交
875
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
876
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
877 878 879 880
				unsigned int flags)
{
	struct socket *sock = file->private_data;

881 882 883
	if (unlikely(!sock->ops->splice_read))
		return -EINVAL;

J
Jens Axboe 已提交
884 885 886
	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}

887
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
888
					 struct sock_iocb *siocb)
889
{
K
Kent Overstreet 已提交
890 891
	if (!is_sync_kiocb(iocb))
		BUG();
L
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892

893 894 895
	siocb->kiocb = iocb;
	iocb->private = siocb;
	return siocb;
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896 897
}

898
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
899 900
		struct file *file, const struct iovec *iov,
		unsigned long nr_segs)
901 902 903 904
{
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
905

906 907
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
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908

909 910 911 912
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
913
	msg->msg_iov = (struct iovec *)iov;
914 915 916 917 918 919
	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);
}

920 921
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
922 923 924
{
	struct sock_iocb siocb, *x;

L
Linus Torvalds 已提交
925 926
	if (pos != 0)
		return -ESPIPE;
927

K
Kent Overstreet 已提交
928
	if (iocb->ki_nbytes == 0)	/* Match SYS5 behaviour */
L
Linus Torvalds 已提交
929 930
		return 0;

931 932

	x = alloc_sock_iocb(iocb, &siocb);
933 934
	if (!x)
		return -ENOMEM;
935
	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
936 937
}

938
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
939 940
			struct file *file, const struct iovec *iov,
			unsigned long nr_segs)
L
Linus Torvalds 已提交
941
{
942 943 944
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
945

946 947
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
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948

949 950 951 952
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
953
	msg->msg_iov = (struct iovec *)iov;
954 955 956 957
	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
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958

959
	return __sock_sendmsg(iocb, sock, msg, size);
L
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960 961
}

962 963
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos)
964 965
{
	struct sock_iocb siocb, *x;
L
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966

967 968
	if (pos != 0)
		return -ESPIPE;
969 970

	x = alloc_sock_iocb(iocb, &siocb);
971 972
	if (!x)
		return -ENOMEM;
L
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973

974
	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
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975 976 977 978 979 980 981
}

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

A
Arjan van de Ven 已提交
982
static DEFINE_MUTEX(br_ioctl_mutex);
983
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
L
Linus Torvalds 已提交
984

985
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
L
Linus Torvalds 已提交
986
{
A
Arjan van de Ven 已提交
987
	mutex_lock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
988
	br_ioctl_hook = hook;
A
Arjan van de Ven 已提交
989
	mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
990 991 992
}
EXPORT_SYMBOL(brioctl_set);

A
Arjan van de Ven 已提交
993
static DEFINE_MUTEX(vlan_ioctl_mutex);
994
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
L
Linus Torvalds 已提交
995

996
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
L
Linus Torvalds 已提交
997
{
A
Arjan van de Ven 已提交
998
	mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
999
	vlan_ioctl_hook = hook;
A
Arjan van de Ven 已提交
1000
	mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1001 1002 1003
}
EXPORT_SYMBOL(vlan_ioctl_set);

A
Arjan van de Ven 已提交
1004
static DEFINE_MUTEX(dlci_ioctl_mutex);
1005
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
L
Linus Torvalds 已提交
1006

1007
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
L
Linus Torvalds 已提交
1008
{
A
Arjan van de Ven 已提交
1009
	mutex_lock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1010
	dlci_ioctl_hook = hook;
A
Arjan van de Ven 已提交
1011
	mutex_unlock(&dlci_ioctl_mutex);
L
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1012 1013 1014
}
EXPORT_SYMBOL(dlci_ioctl_set);

1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
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;
}

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Linus Torvalds 已提交
1033 1034 1035 1036 1037 1038 1039 1040
/*
 *	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;
1041
	struct sock *sk;
L
Linus Torvalds 已提交
1042 1043
	void __user *argp = (void __user *)arg;
	int pid, err;
1044
	struct net *net;
L
Linus Torvalds 已提交
1045

1046
	sock = file->private_data;
1047
	sk = sock->sk;
1048
	net = sock_net(sk);
L
Linus Torvalds 已提交
1049
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1050
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1051
	} else
J
Johannes Berg 已提交
1052
#ifdef CONFIG_WEXT_CORE
L
Linus Torvalds 已提交
1053
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1054
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
1055
	} else
J
Johannes Berg 已提交
1056
#endif
1057
		switch (cmd) {
L
Linus Torvalds 已提交
1058 1059 1060 1061 1062 1063 1064 1065 1066
		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:
1067
			err = put_user(f_getown(sock->file),
1068
				       (int __user *)argp);
L
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1069 1070 1071 1072 1073 1074 1075 1076 1077
			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
1078
			mutex_lock(&br_ioctl_mutex);
1079
			if (br_ioctl_hook)
1080
				err = br_ioctl_hook(net, cmd, argp);
A
Arjan van de Ven 已提交
1081
			mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
1082 1083 1084 1085 1086 1087 1088
			break;
		case SIOCGIFVLAN:
		case SIOCSIFVLAN:
			err = -ENOPKG;
			if (!vlan_ioctl_hook)
				request_module("8021q");

A
Arjan van de Ven 已提交
1089
			mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1090
			if (vlan_ioctl_hook)
1091
				err = vlan_ioctl_hook(net, argp);
A
Arjan van de Ven 已提交
1092
			mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
1093 1094 1095 1096 1097 1098 1099
			break;
		case SIOCADDDLCI:
		case SIOCDELDLCI:
			err = -ENOPKG;
			if (!dlci_ioctl_hook)
				request_module("dlci");

1100 1101
			mutex_lock(&dlci_ioctl_mutex);
			if (dlci_ioctl_hook)
L
Linus Torvalds 已提交
1102
				err = dlci_ioctl_hook(cmd, argp);
1103
			mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1104 1105
			break;
		default:
1106
			err = sock_do_ioctl(net, sock, cmd, arg);
L
Linus Torvalds 已提交
1107
			break;
1108
		}
L
Linus Torvalds 已提交
1109 1110 1111 1112 1113 1114 1115
	return err;
}

int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
	int err;
	struct socket *sock = NULL;
1116

L
Linus Torvalds 已提交
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
	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
1128 1129 1130 1131
	err = security_socket_post_create(sock, family, type, protocol, 1);
	if (err)
		goto out_release;

L
Linus Torvalds 已提交
1132 1133 1134
out:
	*res = sock;
	return err;
V
Venkat Yekkirala 已提交
1135 1136 1137 1138
out_release:
	sock_release(sock);
	sock = NULL;
	goto out;
L
Linus Torvalds 已提交
1139
}
1140
EXPORT_SYMBOL(sock_create_lite);
L
Linus Torvalds 已提交
1141 1142

/* No kernel lock held - perfect */
1143
static unsigned int sock_poll(struct file *file, poll_table *wait)
L
Linus Torvalds 已提交
1144
{
1145
	unsigned int busy_flag = 0;
L
Linus Torvalds 已提交
1146 1147 1148
	struct socket *sock;

	/*
1149
	 *      We can't return errors to poll, so it's either yes or no.
L
Linus Torvalds 已提交
1150
	 */
1151
	sock = file->private_data;
1152

1153
	if (sk_can_busy_loop(sock->sk)) {
1154
		/* this socket can poll_ll so tell the system call */
1155
		busy_flag = POLL_BUSY_LOOP;
1156 1157

		/* once, only if requested by syscall */
1158 1159
		if (wait && (wait->_key & POLL_BUSY_LOOP))
			sk_busy_loop(sock->sk, 1);
1160 1161
	}

1162
	return busy_flag | sock->ops->poll(file, sock, wait);
L
Linus Torvalds 已提交
1163 1164
}

1165
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1166
{
1167
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
1168 1169 1170 1171

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

1172
static int sock_close(struct inode *inode, struct file *filp)
L
Linus Torvalds 已提交
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
{
	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)
1186
 *	   or under socket lock
L
Linus Torvalds 已提交
1187 1188 1189 1190
 */

static int sock_fasync(int fd, struct file *filp, int on)
{
1191 1192
	struct socket *sock = filp->private_data;
	struct sock *sk = sock->sk;
1193
	struct socket_wq *wq;
L
Linus Torvalds 已提交
1194

1195
	if (sk == NULL)
L
Linus Torvalds 已提交
1196 1197 1198
		return -EINVAL;

	lock_sock(sk);
1199 1200
	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
1201

1202
	if (!wq->fasync_list)
1203 1204
		sock_reset_flag(sk, SOCK_FASYNC);
	else
E
Eric Dumazet 已提交
1205
		sock_set_flag(sk, SOCK_FASYNC);
L
Linus Torvalds 已提交
1206

1207
	release_sock(sk);
L
Linus Torvalds 已提交
1208 1209 1210
	return 0;
}

1211
/* This function may be called only under socket lock or callback_lock or rcu_lock */
L
Linus Torvalds 已提交
1212 1213 1214

int sock_wake_async(struct socket *sock, int how, int band)
{
1215 1216 1217 1218 1219 1220 1221 1222
	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
1223
		return -1;
1224
	}
1225
	switch (how) {
1226
	case SOCK_WAKE_WAITD:
L
Linus Torvalds 已提交
1227 1228 1229
		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
			break;
		goto call_kill;
1230
	case SOCK_WAKE_SPACE:
L
Linus Torvalds 已提交
1231 1232 1233
		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
			break;
		/* fall through */
1234
	case SOCK_WAKE_IO:
1235
call_kill:
1236
		kill_fasync(&wq->fasync_list, SIGIO, band);
L
Linus Torvalds 已提交
1237
		break;
1238
	case SOCK_WAKE_URG:
1239
		kill_fasync(&wq->fasync_list, SIGURG, band);
L
Linus Torvalds 已提交
1240
	}
1241
	rcu_read_unlock();
L
Linus Torvalds 已提交
1242 1243
	return 0;
}
1244
EXPORT_SYMBOL(sock_wake_async);
L
Linus Torvalds 已提交
1245

P
Pavel Emelyanov 已提交
1246
int __sock_create(struct net *net, int family, int type, int protocol,
1247
			 struct socket **res, int kern)
L
Linus Torvalds 已提交
1248 1249 1250
{
	int err;
	struct socket *sock;
1251
	const struct net_proto_family *pf;
L
Linus Torvalds 已提交
1252 1253

	/*
1254
	 *      Check protocol is in range
L
Linus Torvalds 已提交
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
	 */
	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) {
1267
		static int warned;
L
Linus Torvalds 已提交
1268 1269
		if (!warned) {
			warned = 1;
1270 1271
			pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
				current->comm);
L
Linus Torvalds 已提交
1272 1273 1274 1275 1276 1277 1278
		}
		family = PF_PACKET;
	}

	err = security_socket_create(family, type, protocol, kern);
	if (err)
		return err;
1279

1280 1281 1282 1283 1284 1285 1286
	/*
	 *	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) {
1287
		net_warn_ratelimited("socket: no more sockets\n");
1288 1289 1290 1291 1292 1293
		return -ENFILE;	/* Not exactly a match, but its the
				   closest posix thing */
	}

	sock->type = type;

1294
#ifdef CONFIG_MODULES
1295 1296 1297
	/* 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
1298 1299 1300
	 * requested real, full-featured networking support upon configuration.
	 * Otherwise module support will break!
	 */
E
Eric Dumazet 已提交
1301
	if (rcu_access_pointer(net_families[family]) == NULL)
1302
		request_module("net-pf-%d", family);
L
Linus Torvalds 已提交
1303 1304
#endif

1305 1306 1307 1308 1309
	rcu_read_lock();
	pf = rcu_dereference(net_families[family]);
	err = -EAFNOSUPPORT;
	if (!pf)
		goto out_release;
L
Linus Torvalds 已提交
1310 1311 1312 1313 1314

	/*
	 * We will call the ->create function, that possibly is in a loadable
	 * module, so we have to bump that loadable module refcnt first.
	 */
1315
	if (!try_module_get(pf->owner))
L
Linus Torvalds 已提交
1316 1317
		goto out_release;

1318 1319 1320
	/* Now protected by module ref count */
	rcu_read_unlock();

1321
	err = pf->create(net, sock, protocol, kern);
1322
	if (err < 0)
L
Linus Torvalds 已提交
1323
		goto out_module_put;
1324

L
Linus Torvalds 已提交
1325 1326 1327 1328
	/*
	 * Now to bump the refcnt of the [loadable] module that owns this
	 * socket at sock_release time we decrement its refcnt.
	 */
1329 1330 1331
	if (!try_module_get(sock->ops->owner))
		goto out_module_busy;

L
Linus Torvalds 已提交
1332 1333 1334 1335
	/*
	 * Now that we're done with the ->create function, the [loadable]
	 * module can have its refcnt decremented
	 */
1336
	module_put(pf->owner);
V
Venkat Yekkirala 已提交
1337 1338
	err = security_socket_post_create(sock, family, type, protocol, kern);
	if (err)
1339
		goto out_sock_release;
1340
	*res = sock;
L
Linus Torvalds 已提交
1341

1342 1343 1344 1345
	return 0;

out_module_busy:
	err = -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1346
out_module_put:
1347 1348 1349
	sock->ops = NULL;
	module_put(pf->owner);
out_sock_release:
L
Linus Torvalds 已提交
1350
	sock_release(sock);
1351 1352 1353 1354 1355
	return err;

out_release:
	rcu_read_unlock();
	goto out_sock_release;
L
Linus Torvalds 已提交
1356
}
P
Pavel Emelyanov 已提交
1357
EXPORT_SYMBOL(__sock_create);
L
Linus Torvalds 已提交
1358 1359 1360

int sock_create(int family, int type, int protocol, struct socket **res)
{
1361
	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
L
Linus Torvalds 已提交
1362
}
1363
EXPORT_SYMBOL(sock_create);
L
Linus Torvalds 已提交
1364 1365 1366

int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
1367
	return __sock_create(&init_net, family, type, protocol, res, 1);
L
Linus Torvalds 已提交
1368
}
1369
EXPORT_SYMBOL(sock_create_kern);
L
Linus Torvalds 已提交
1370

1371
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
L
Linus Torvalds 已提交
1372 1373 1374
{
	int retval;
	struct socket *sock;
1375 1376
	int flags;

1377 1378 1379 1380 1381 1382
	/* 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);

1383
	flags = type & ~SOCK_TYPE_MASK;
1384
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1385 1386
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1387

U
Ulrich Drepper 已提交
1388 1389 1390
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1391 1392 1393 1394
	retval = sock_create(family, type, protocol, &sock);
	if (retval < 0)
		goto out;

1395
	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
L
Linus Torvalds 已提交
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
	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.
 */

1412 1413
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
		int __user *, usockvec)
L
Linus Torvalds 已提交
1414 1415 1416
{
	struct socket *sock1, *sock2;
	int fd1, fd2, err;
A
Al Viro 已提交
1417
	struct file *newfile1, *newfile2;
1418 1419 1420
	int flags;

	flags = type & ~SOCK_TYPE_MASK;
1421
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1422 1423
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1424

U
Ulrich Drepper 已提交
1425 1426 1427
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
	/*
	 * 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);
1442
	if (err < 0)
L
Linus Torvalds 已提交
1443 1444
		goto out_release_both;

1445
	fd1 = get_unused_fd_flags(flags);
1446 1447
	if (unlikely(fd1 < 0)) {
		err = fd1;
A
Al Viro 已提交
1448
		goto out_release_both;
1449
	}
1450

1451
	fd2 = get_unused_fd_flags(flags);
1452 1453
	if (unlikely(fd2 < 0)) {
		err = fd2;
1454
		goto out_put_unused_1;
1455 1456
	}

1457
	newfile1 = sock_alloc_file(sock1, flags, NULL);
1458 1459
	if (unlikely(IS_ERR(newfile1))) {
		err = PTR_ERR(newfile1);
1460
		goto out_put_unused_both;
1461 1462
	}

1463
	newfile2 = sock_alloc_file(sock2, flags, NULL);
1464 1465
	if (IS_ERR(newfile2)) {
		err = PTR_ERR(newfile2);
1466
		goto out_fput_1;
A
Al Viro 已提交
1467 1468
	}

1469 1470 1471 1472 1473 1474 1475 1476
	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
1477
	audit_fd_pair(fd1, fd2);
1478

A
Al Viro 已提交
1479 1480
	fd_install(fd1, newfile1);
	fd_install(fd2, newfile2);
L
Linus Torvalds 已提交
1481 1482 1483 1484
	/* fd1 and fd2 may be already another descriptors.
	 * Not kernel problem.
	 */

1485
	return 0;
L
Linus Torvalds 已提交
1486

1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
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
1500

1501 1502 1503 1504
out_put_unused_both:
	put_unused_fd(fd2);
out_put_unused_1:
	put_unused_fd(fd1);
L
Linus Torvalds 已提交
1505
out_release_both:
1506
	sock_release(sock2);
L
Linus Torvalds 已提交
1507
out_release_1:
1508
	sock_release(sock1);
L
Linus Torvalds 已提交
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
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).
 */

1521
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
L
Linus Torvalds 已提交
1522 1523
{
	struct socket *sock;
1524
	struct sockaddr_storage address;
1525
	int err, fput_needed;
L
Linus Torvalds 已提交
1526

1527
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1528
	if (sock) {
1529
		err = move_addr_to_kernel(umyaddr, addrlen, &address);
1530 1531
		if (err >= 0) {
			err = security_socket_bind(sock,
1532
						   (struct sockaddr *)&address,
1533
						   addrlen);
1534 1535
			if (!err)
				err = sock->ops->bind(sock,
1536
						      (struct sockaddr *)
1537
						      &address, addrlen);
L
Linus Torvalds 已提交
1538
		}
1539
		fput_light(sock->file, fput_needed);
1540
	}
L
Linus Torvalds 已提交
1541 1542 1543 1544 1545 1546 1547 1548 1549
	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.
 */

1550
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
L
Linus Torvalds 已提交
1551 1552
{
	struct socket *sock;
1553
	int err, fput_needed;
1554
	int somaxconn;
1555 1556 1557

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
1558
		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1559
		if ((unsigned int)backlog > somaxconn)
1560
			backlog = somaxconn;
L
Linus Torvalds 已提交
1561 1562

		err = security_socket_listen(sock, backlog);
1563 1564
		if (!err)
			err = sock->ops->listen(sock, backlog);
L
Linus Torvalds 已提交
1565

1566
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
	}
	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.
 */

1583 1584
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen, int, flags)
L
Linus Torvalds 已提交
1585 1586
{
	struct socket *sock, *newsock;
1587
	struct file *newfile;
1588
	int err, len, newfd, fput_needed;
1589
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1590

1591
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
U
Ulrich Drepper 已提交
1592 1593 1594 1595 1596
		return -EINVAL;

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

1597
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1598 1599 1600 1601
	if (!sock)
		goto out;

	err = -ENFILE;
1602 1603
	newsock = sock_alloc();
	if (!newsock)
L
Linus Torvalds 已提交
1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
		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);

1615
	newfd = get_unused_fd_flags(flags);
1616 1617
	if (unlikely(newfd < 0)) {
		err = newfd;
1618 1619
		sock_release(newsock);
		goto out_put;
1620
	}
1621
	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1622 1623 1624 1625 1626 1627
	if (unlikely(IS_ERR(newfile))) {
		err = PTR_ERR(newfile);
		put_unused_fd(newfd);
		sock_release(newsock);
		goto out_put;
	}
1628

1629 1630
	err = security_socket_accept(sock, newsock);
	if (err)
1631
		goto out_fd;
1632

L
Linus Torvalds 已提交
1633 1634
	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
	if (err < 0)
1635
		goto out_fd;
L
Linus Torvalds 已提交
1636 1637

	if (upeer_sockaddr) {
1638
		if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1639
					  &len, 2) < 0) {
L
Linus Torvalds 已提交
1640
			err = -ECONNABORTED;
1641
			goto out_fd;
L
Linus Torvalds 已提交
1642
		}
1643
		err = move_addr_to_user(&address,
1644
					len, upeer_sockaddr, upeer_addrlen);
L
Linus Torvalds 已提交
1645
		if (err < 0)
1646
			goto out_fd;
L
Linus Torvalds 已提交
1647 1648 1649 1650
	}

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

1651 1652
	fd_install(newfd, newfile);
	err = newfd;
L
Linus Torvalds 已提交
1653 1654

out_put:
1655
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1656 1657
out:
	return err;
1658
out_fd:
1659
	fput(newfile);
1660
	put_unused_fd(newfd);
L
Linus Torvalds 已提交
1661 1662 1663
	goto out_put;
}

1664 1665
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen)
U
Ulrich Drepper 已提交
1666
{
U
Ulrich Drepper 已提交
1667
	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
U
Ulrich Drepper 已提交
1668 1669
}

L
Linus Torvalds 已提交
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
/*
 *	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.
 */

1682 1683
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
		int, addrlen)
L
Linus Torvalds 已提交
1684 1685
{
	struct socket *sock;
1686
	struct sockaddr_storage address;
1687
	int err, fput_needed;
L
Linus Torvalds 已提交
1688

1689
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1690 1691
	if (!sock)
		goto out;
1692
	err = move_addr_to_kernel(uservaddr, addrlen, &address);
L
Linus Torvalds 已提交
1693 1694 1695
	if (err < 0)
		goto out_put;

1696
	err =
1697
	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
L
Linus Torvalds 已提交
1698 1699 1700
	if (err)
		goto out_put;

1701
	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
L
Linus Torvalds 已提交
1702 1703
				 sock->file->f_flags);
out_put:
1704
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1705 1706 1707 1708 1709 1710 1711 1712 1713
out:
	return err;
}

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

1714 1715
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1716 1717
{
	struct socket *sock;
1718
	struct sockaddr_storage address;
1719
	int len, err, fput_needed;
1720

1721
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1722 1723 1724 1725 1726 1727 1728
	if (!sock)
		goto out;

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

1729
	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
L
Linus Torvalds 已提交
1730 1731
	if (err)
		goto out_put;
1732
	err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
L
Linus Torvalds 已提交
1733 1734

out_put:
1735
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1736 1737 1738 1739 1740 1741 1742 1743 1744
out:
	return err;
}

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

1745 1746
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1747 1748
{
	struct socket *sock;
1749
	struct sockaddr_storage address;
1750
	int len, err, fput_needed;
L
Linus Torvalds 已提交
1751

1752 1753
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1754 1755
		err = security_socket_getpeername(sock);
		if (err) {
1756
			fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1757 1758 1759
			return err;
		}

1760
		err =
1761
		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1762
				       1);
L
Linus Torvalds 已提交
1763
		if (!err)
1764
			err = move_addr_to_user(&address, len, usockaddr,
1765
						usockaddr_len);
1766
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
	}
	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.
 */

1777
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1778
		unsigned int, flags, struct sockaddr __user *, addr,
1779
		int, addr_len)
L
Linus Torvalds 已提交
1780 1781
{
	struct socket *sock;
1782
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1783 1784 1785
	int err;
	struct msghdr msg;
	struct iovec iov;
1786 1787
	int fput_needed;

1788 1789
	if (len > INT_MAX)
		len = INT_MAX;
1790 1791
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
1792
		goto out;
1793

1794 1795 1796 1797 1798 1799 1800 1801
	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;
1802
	if (addr) {
1803
		err = move_addr_to_kernel(addr, addr_len, &address);
L
Linus Torvalds 已提交
1804 1805
		if (err < 0)
			goto out_put;
1806
		msg.msg_name = (struct sockaddr *)&address;
1807
		msg.msg_namelen = addr_len;
L
Linus Torvalds 已提交
1808 1809 1810 1811 1812 1813
	}
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
	msg.msg_flags = flags;
	err = sock_sendmsg(sock, &msg, len);

1814
out_put:
1815
	fput_light(sock->file, fput_needed);
1816
out:
L
Linus Torvalds 已提交
1817 1818 1819 1820
	return err;
}

/*
1821
 *	Send a datagram down a socket.
L
Linus Torvalds 已提交
1822 1823
 */

1824
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1825
		unsigned int, flags)
L
Linus Torvalds 已提交
1826 1827 1828 1829 1830
{
	return sys_sendto(fd, buff, len, flags, NULL, 0);
}

/*
1831
 *	Receive a frame from the socket and optionally record the address of the
L
Linus Torvalds 已提交
1832 1833 1834 1835
 *	sender. We verify the buffers are writable and if needed move the
 *	sender address from kernel to user space.
 */

1836
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1837
		unsigned int, flags, struct sockaddr __user *, addr,
1838
		int __user *, addr_len)
L
Linus Torvalds 已提交
1839 1840 1841 1842
{
	struct socket *sock;
	struct iovec iov;
	struct msghdr msg;
1843
	struct sockaddr_storage address;
1844
	int err, err2;
1845 1846
	int fput_needed;

1847 1848
	if (size > INT_MAX)
		size = INT_MAX;
1849
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1850
	if (!sock)
1851
		goto out;
L
Linus Torvalds 已提交
1852

1853 1854 1855 1856 1857 1858
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_iovlen = 1;
	msg.msg_iov = &iov;
	iov.iov_len = size;
	iov.iov_base = ubuf;
1859 1860 1861 1862
	/* 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
1863 1864
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
1865
	err = sock_recvmsg(sock, &msg, size, flags);
L
Linus Torvalds 已提交
1866

1867
	if (err >= 0 && addr != NULL) {
1868
		err2 = move_addr_to_user(&address,
1869
					 msg.msg_namelen, addr, addr_len);
1870 1871
		if (err2 < 0)
			err = err2;
L
Linus Torvalds 已提交
1872
	}
1873 1874

	fput_light(sock->file, fput_needed);
1875
out:
L
Linus Torvalds 已提交
1876 1877 1878 1879
	return err;
}

/*
1880
 *	Receive a datagram from a socket.
L
Linus Torvalds 已提交
1881 1882
 */

1883
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1884
			 unsigned int flags)
L
Linus Torvalds 已提交
1885 1886 1887 1888 1889 1890 1891 1892 1893
{
	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.
 */

1894 1895
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int, optlen)
L
Linus Torvalds 已提交
1896
{
1897
	int err, fput_needed;
L
Linus Torvalds 已提交
1898 1899 1900 1901
	struct socket *sock;

	if (optlen < 0)
		return -EINVAL;
1902 1903 1904 1905

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
		err = security_socket_setsockopt(sock, level, optname);
1906 1907
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1908 1909

		if (level == SOL_SOCKET)
1910 1911 1912
			err =
			    sock_setsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1913
		else
1914 1915 1916
			err =
			    sock->ops->setsockopt(sock, level, optname, optval,
						  optlen);
1917 1918
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1919 1920 1921 1922 1923 1924 1925 1926 1927
	}
	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.
 */

1928 1929
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int __user *, optlen)
L
Linus Torvalds 已提交
1930
{
1931
	int err, fput_needed;
L
Linus Torvalds 已提交
1932 1933
	struct socket *sock;

1934 1935
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
1936 1937 1938
		err = security_socket_getsockopt(sock, level, optname);
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1939 1940

		if (level == SOL_SOCKET)
1941 1942 1943
			err =
			    sock_getsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1944
		else
1945 1946 1947
			err =
			    sock->ops->getsockopt(sock, level, optname, optval,
						  optlen);
1948 1949
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1950 1951 1952 1953 1954 1955 1956 1957
	}
	return err;
}

/*
 *	Shutdown a socket.
 */

1958
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
L
Linus Torvalds 已提交
1959
{
1960
	int err, fput_needed;
L
Linus Torvalds 已提交
1961 1962
	struct socket *sock;

1963 1964
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1965
		err = security_socket_shutdown(sock, how);
1966 1967 1968
		if (!err)
			err = sock->ops->shutdown(sock, how);
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1969 1970 1971 1972
	}
	return err;
}

1973
/* A couple of helpful macros for getting the address of the 32/64 bit
L
Linus Torvalds 已提交
1974 1975 1976 1977 1978 1979
 * 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)

1980 1981 1982 1983 1984
struct used_address {
	struct sockaddr_storage name;
	unsigned int name_len;
};

1985 1986 1987 1988 1989
static int copy_msghdr_from_user(struct msghdr *kmsg,
				 struct msghdr __user *umsg)
{
	if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
		return -EFAULT;
1990 1991 1992 1993

	if (kmsg->msg_namelen < 0)
		return -EINVAL;

1994
	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1995
		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1996 1997 1998
	return 0;
}

1999
static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
2000
			 struct msghdr *msg_sys, unsigned int flags,
2001
			 struct used_address *used_address)
L
Linus Torvalds 已提交
2002
{
2003 2004
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
2005
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
2006
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2007
	unsigned char ctl[sizeof(struct cmsghdr) + 20]
2008 2009
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));
	/* 20 is size of ipv6_pktinfo */
L
Linus Torvalds 已提交
2010
	unsigned char *ctl_buf = ctl;
E
Eric Dumazet 已提交
2011
	int err, ctl_len, total_len;
2012

L
Linus Torvalds 已提交
2013 2014
	err = -EFAULT;
	if (MSG_CMSG_COMPAT & flags) {
2015
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
2016
			return -EFAULT;
2017 2018 2019 2020 2021
	} else {
		err = copy_msghdr_from_user(msg_sys, msg);
		if (err)
			return err;
	}
L
Linus Torvalds 已提交
2022

2023
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
E
Eric Dumazet 已提交
2024 2025 2026 2027 2028 2029
		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
2030
		if (!iov)
2031
			goto out;
L
Linus Torvalds 已提交
2032 2033 2034 2035
	}

	/* This will also move the address data into kernel space */
	if (MSG_CMSG_COMPAT & flags) {
2036
		err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
L
Linus Torvalds 已提交
2037
	} else
2038
		err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2039
	if (err < 0)
L
Linus Torvalds 已提交
2040 2041 2042 2043 2044
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

2045
	if (msg_sys->msg_controllen > INT_MAX)
L
Linus Torvalds 已提交
2046
		goto out_freeiov;
2047
	ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
2048
	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2049
		err =
2050
		    cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2051
						     sizeof(ctl));
L
Linus Torvalds 已提交
2052 2053
		if (err)
			goto out_freeiov;
2054 2055
		ctl_buf = msg_sys->msg_control;
		ctl_len = msg_sys->msg_controllen;
L
Linus Torvalds 已提交
2056
	} else if (ctl_len) {
2057
		if (ctl_len > sizeof(ctl)) {
L
Linus Torvalds 已提交
2058
			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2059
			if (ctl_buf == NULL)
L
Linus Torvalds 已提交
2060 2061 2062 2063
				goto out_freeiov;
		}
		err = -EFAULT;
		/*
2064
		 * Careful! Before this, msg_sys->msg_control contains a user pointer.
L
Linus Torvalds 已提交
2065 2066 2067
		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
		 * checking falls down on this.
		 */
2068
		if (copy_from_user(ctl_buf,
2069
				   (void __user __force *)msg_sys->msg_control,
2070
				   ctl_len))
L
Linus Torvalds 已提交
2071
			goto out_freectl;
2072
		msg_sys->msg_control = ctl_buf;
L
Linus Torvalds 已提交
2073
	}
2074
	msg_sys->msg_flags = flags;
L
Linus Torvalds 已提交
2075 2076

	if (sock->file->f_flags & O_NONBLOCK)
2077
		msg_sys->msg_flags |= MSG_DONTWAIT;
2078 2079 2080 2081 2082 2083
	/*
	 * 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.
	 */
2084 2085 2086
	if (used_address && msg_sys->msg_name &&
	    used_address->name_len == msg_sys->msg_namelen &&
	    !memcmp(&used_address->name, msg_sys->msg_name,
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097
		    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;
2098 2099 2100
		if (msg_sys->msg_name)
			memcpy(&used_address->name, msg_sys->msg_name,
			       used_address->name_len);
2101
	}
L
Linus Torvalds 已提交
2102 2103

out_freectl:
2104
	if (ctl_buf != ctl)
L
Linus Torvalds 已提交
2105 2106 2107
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
E
Eric Dumazet 已提交
2108
		kfree(iov);
2109 2110 2111 2112 2113 2114 2115 2116
out:
	return err;
}

/*
 *	BSD sendmsg interface
 */

2117
long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
2118 2119 2120
{
	int fput_needed, err;
	struct msghdr msg_sys;
2121 2122 2123
	struct socket *sock;

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2124 2125 2126
	if (!sock)
		goto out;

2127
	err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2128

2129
	fput_light(sock->file, fput_needed);
2130
out:
L
Linus Torvalds 已提交
2131 2132 2133
	return err;
}

2134 2135 2136 2137 2138 2139 2140
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);
}

2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
/*
 *	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;
2153
	struct used_address used_address;
2154

2155 2156
	if (vlen > UIO_MAXIOV)
		vlen = UIO_MAXIOV;
2157 2158 2159 2160 2161 2162 2163

	datagrams = 0;

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

2164
	used_address.name_len = UINT_MAX;
2165 2166
	entry = mmsg;
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2167
	err = 0;
2168 2169 2170

	while (datagrams < vlen) {
		if (MSG_CMSG_COMPAT & flags) {
2171 2172
			err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
					     &msg_sys, flags, &used_address);
2173 2174 2175 2176 2177
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
2178 2179 2180
			err = ___sys_sendmsg(sock,
					     (struct msghdr __user *)entry,
					     &msg_sys, flags, &used_address);
2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

		if (err)
			break;
		++datagrams;
	}

	fput_light(sock->file, fput_needed);

2194 2195
	/* We only return an error if no datagrams were able to be sent */
	if (datagrams != 0)
2196 2197 2198 2199 2200 2201 2202 2203
		return datagrams;

	return err;
}

SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
		unsigned int, vlen, unsigned int, flags)
{
2204 2205
	if (flags & MSG_CMSG_COMPAT)
		return -EINVAL;
2206 2207 2208
	return __sys_sendmmsg(fd, mmsg, vlen, flags);
}

2209
static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2210
			 struct msghdr *msg_sys, unsigned int flags, int nosec)
L
Linus Torvalds 已提交
2211
{
2212 2213
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
Linus Torvalds 已提交
2214
	struct iovec iovstack[UIO_FASTIOV];
2215
	struct iovec *iov = iovstack;
L
Linus Torvalds 已提交
2216
	unsigned long cmsg_ptr;
E
Eric Dumazet 已提交
2217
	int err, total_len, len;
L
Linus Torvalds 已提交
2218 2219

	/* kernel mode address */
2220
	struct sockaddr_storage addr;
L
Linus Torvalds 已提交
2221 2222 2223 2224

	/* user mode address pointers */
	struct sockaddr __user *uaddr;
	int __user *uaddr_len;
2225

L
Linus Torvalds 已提交
2226
	if (MSG_CMSG_COMPAT & flags) {
2227
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
2228
			return -EFAULT;
2229 2230 2231 2232 2233
	} else {
		err = copy_msghdr_from_user(msg_sys, msg);
		if (err)
			return err;
	}
L
Linus Torvalds 已提交
2234

2235
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
E
Eric Dumazet 已提交
2236 2237 2238 2239 2240 2241
		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
2242
		if (!iov)
2243
			goto out;
L
Linus Torvalds 已提交
2244 2245
	}

2246 2247
	/* Save the user-mode address (verify_iovec will change the
	 * kernel msghdr to use the kernel address space)
L
Linus Torvalds 已提交
2248
	 */
2249
	uaddr = (__force void __user *)msg_sys->msg_name;
L
Linus Torvalds 已提交
2250
	uaddr_len = COMPAT_NAMELEN(msg);
2251
	if (MSG_CMSG_COMPAT & flags)
2252
		err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2253
	else
2254
		err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
L
Linus Torvalds 已提交
2255 2256
	if (err < 0)
		goto out_freeiov;
2257
	total_len = err;
L
Linus Torvalds 已提交
2258

2259 2260
	cmsg_ptr = (unsigned long)msg_sys->msg_control;
	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2261

2262 2263 2264
	/* We assume all kernel code knows the size of sockaddr_storage */
	msg_sys->msg_namelen = 0;

L
Linus Torvalds 已提交
2265 2266
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
2267 2268
	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
							  total_len, flags);
L
Linus Torvalds 已提交
2269 2270 2271 2272 2273
	if (err < 0)
		goto out_freeiov;
	len = err;

	if (uaddr != NULL) {
2274
		err = move_addr_to_user(&addr,
2275
					msg_sys->msg_namelen, uaddr,
2276
					uaddr_len);
L
Linus Torvalds 已提交
2277 2278 2279
		if (err < 0)
			goto out_freeiov;
	}
2280
	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2281
			 COMPAT_FLAGS(msg));
L
Linus Torvalds 已提交
2282 2283 2284
	if (err)
		goto out_freeiov;
	if (MSG_CMSG_COMPAT & flags)
2285
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2286 2287
				 &msg_compat->msg_controllen);
	else
2288
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2289 2290 2291 2292 2293 2294 2295
				 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

out_freeiov:
	if (iov != iovstack)
E
Eric Dumazet 已提交
2296
		kfree(iov);
2297 2298 2299 2300 2301 2302 2303 2304
out:
	return err;
}

/*
 *	BSD recvmsg interface
 */

2305
long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
2306 2307 2308
{
	int fput_needed, err;
	struct msghdr msg_sys;
2309 2310 2311
	struct socket *sock;

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2312 2313 2314
	if (!sock)
		goto out;

2315
	err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2316

2317
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
2318 2319 2320 2321
out:
	return err;
}

2322 2323 2324 2325 2326 2327 2328 2329
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);
}

2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
/*
 *     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;
2340
	struct compat_mmsghdr __user *compat_entry;
2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
	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;
2360
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2361 2362 2363 2364 2365

	while (datagrams < vlen) {
		/*
		 * No need to ask LSM for more than the first datagram.
		 */
2366
		if (MSG_CMSG_COMPAT & flags) {
2367 2368 2369
			err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
					     &msg_sys, flags & ~MSG_WAITFORONE,
					     datagrams);
2370 2371 2372 2373 2374
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
2375 2376 2377 2378
			err = ___sys_recvmsg(sock,
					     (struct msghdr __user *)entry,
					     &msg_sys, flags & ~MSG_WAITFORONE,
					     datagrams);
2379 2380 2381 2382 2383 2384
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

2385 2386 2387 2388
		if (err)
			break;
		++datagrams;

2389 2390 2391 2392
		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
		if (flags & MSG_WAITFORONE)
			flags |= MSG_DONTWAIT;

2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
		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
2413

2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444
	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;

2445 2446 2447
	if (flags & MSG_CMSG_COMPAT)
		return -EINVAL;

2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463
	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
2464 2465
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
2466
static const unsigned char nargs[21] = {
2467 2468 2469
	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),
2470
	AL(4), AL(5), AL(4)
2471 2472
};

L
Linus Torvalds 已提交
2473 2474 2475
#undef AL

/*
2476
 *	System call vectors.
L
Linus Torvalds 已提交
2477 2478 2479
 *
 *	Argument checking cleaned up. Saved 20% in size.
 *  This function doesn't need to set the kernel lock because
2480
 *  it is set by the callees.
L
Linus Torvalds 已提交
2481 2482
 */

2483
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
L
Linus Torvalds 已提交
2484
{
2485
	unsigned long a[AUDITSC_ARGS];
2486
	unsigned long a0, a1;
L
Linus Torvalds 已提交
2487
	int err;
2488
	unsigned int len;
L
Linus Torvalds 已提交
2489

2490
	if (call < 1 || call > SYS_SENDMMSG)
L
Linus Torvalds 已提交
2491 2492
		return -EINVAL;

2493 2494 2495 2496
	len = nargs[call];
	if (len > sizeof(a))
		return -EINVAL;

L
Linus Torvalds 已提交
2497
	/* copy_from_user should be SMP safe. */
2498
	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
2499
		return -EFAULT;
2500

2501 2502 2503
	err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
	if (err)
		return err;
2504

2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521
	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
2522 2523
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], 0);
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 2561 2562 2563 2564 2565 2566
		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;
2567 2568 2569
	case SYS_SENDMMSG:
		err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
		break;
2570 2571 2572
	case SYS_RECVMSG:
		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
2573 2574 2575 2576
	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
2577 2578 2579
	case SYS_ACCEPT4:
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], a[3]);
U
Ulrich Drepper 已提交
2580
		break;
2581 2582 2583
	default:
		err = -EINVAL;
		break;
L
Linus Torvalds 已提交
2584 2585 2586 2587
	}
	return err;
}

2588
#endif				/* __ARCH_WANT_SYS_SOCKETCALL */
L
Linus Torvalds 已提交
2589

2590 2591 2592 2593
/**
 *	sock_register - add a socket protocol handler
 *	@ops: description of protocol
 *
L
Linus Torvalds 已提交
2594 2595
 *	This function is called by a protocol handler that wants to
 *	advertise its address family, and have it linked into the
2596 2597
 *	socket interface. The value ops->family coresponds to the
 *	socket system call protocol family.
L
Linus Torvalds 已提交
2598
 */
2599
int sock_register(const struct net_proto_family *ops)
L
Linus Torvalds 已提交
2600 2601 2602 2603
{
	int err;

	if (ops->family >= NPROTO) {
2604
		pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
L
Linus Torvalds 已提交
2605 2606
		return -ENOBUFS;
	}
2607 2608

	spin_lock(&net_family_lock);
E
Eric Dumazet 已提交
2609 2610
	if (rcu_dereference_protected(net_families[ops->family],
				      lockdep_is_held(&net_family_lock)))
2611 2612
		err = -EEXIST;
	else {
2613
		rcu_assign_pointer(net_families[ops->family], ops);
L
Linus Torvalds 已提交
2614 2615
		err = 0;
	}
2616 2617
	spin_unlock(&net_family_lock);

2618
	pr_info("NET: Registered protocol family %d\n", ops->family);
L
Linus Torvalds 已提交
2619 2620
	return err;
}
2621
EXPORT_SYMBOL(sock_register);
L
Linus Torvalds 已提交
2622

2623 2624 2625 2626
/**
 *	sock_unregister - remove a protocol handler
 *	@family: protocol family to remove
 *
L
Linus Torvalds 已提交
2627 2628
 *	This function is called by a protocol handler that wants to
 *	remove its address family, and have it unlinked from the
2629 2630 2631 2632 2633 2634
 *	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
2635
 */
2636
void sock_unregister(int family)
L
Linus Torvalds 已提交
2637
{
2638
	BUG_ON(family < 0 || family >= NPROTO);
L
Linus Torvalds 已提交
2639

2640
	spin_lock(&net_family_lock);
2641
	RCU_INIT_POINTER(net_families[family], NULL);
2642 2643 2644 2645
	spin_unlock(&net_family_lock);

	synchronize_rcu();

2646
	pr_info("NET: Unregistered protocol family %d\n", family);
L
Linus Torvalds 已提交
2647
}
2648
EXPORT_SYMBOL(sock_unregister);
L
Linus Torvalds 已提交
2649

2650
static int __init sock_init(void)
L
Linus Torvalds 已提交
2651
{
N
Nick Piggin 已提交
2652
	int err;
2653 2654 2655 2656 2657 2658
	/*
	 *      Initialize the network sysctl infrastructure.
	 */
	err = net_sysctl_init();
	if (err)
		goto out;
N
Nick Piggin 已提交
2659

L
Linus Torvalds 已提交
2660
	/*
2661
	 *      Initialize skbuff SLAB cache
L
Linus Torvalds 已提交
2662 2663 2664 2665
	 */
	skb_init();

	/*
2666
	 *      Initialize the protocols module.
L
Linus Torvalds 已提交
2667 2668 2669
	 */

	init_inodecache();
N
Nick Piggin 已提交
2670 2671 2672 2673

	err = register_filesystem(&sock_fs_type);
	if (err)
		goto out_fs;
L
Linus Torvalds 已提交
2674
	sock_mnt = kern_mount(&sock_fs_type);
N
Nick Piggin 已提交
2675 2676 2677 2678
	if (IS_ERR(sock_mnt)) {
		err = PTR_ERR(sock_mnt);
		goto out_mount;
	}
2679 2680

	/* The real protocol initialization is performed in later initcalls.
L
Linus Torvalds 已提交
2681 2682 2683
	 */

#ifdef CONFIG_NETFILTER
2684 2685 2686
	err = netfilter_init();
	if (err)
		goto out;
L
Linus Torvalds 已提交
2687
#endif
2688

2689
	ptp_classifier_init();
2690

N
Nick Piggin 已提交
2691 2692 2693 2694 2695 2696 2697
out:
	return err;

out_mount:
	unregister_filesystem(&sock_fs_type);
out_fs:
	goto out;
L
Linus Torvalds 已提交
2698 2699
}

2700 2701
core_initcall(sock_init);	/* early initcall */

L
Linus Torvalds 已提交
2702 2703 2704 2705 2706 2707
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
	int cpu;
	int counter = 0;

2708
	for_each_possible_cpu(cpu)
2709
	    counter += per_cpu(sockets_in_use, cpu);
L
Linus Torvalds 已提交
2710 2711 2712 2713 2714 2715 2716

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

	seq_printf(seq, "sockets: used %d\n", counter);
}
2717
#endif				/* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2718

2719
#ifdef CONFIG_COMPAT
2720
static int do_siocgstamp(struct net *net, struct socket *sock,
2721
			 unsigned int cmd, void __user *up)
2722 2723 2724 2725 2726 2727
{
	mm_segment_t old_fs = get_fs();
	struct timeval ktv;
	int err;

	set_fs(KERNEL_DS);
2728
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2729
	set_fs(old_fs);
2730
	if (!err)
2731
		err = compat_put_timeval(&ktv, up);
2732

2733 2734 2735
	return err;
}

2736
static int do_siocgstampns(struct net *net, struct socket *sock,
2737
			   unsigned int cmd, void __user *up)
2738 2739 2740 2741 2742 2743
{
	mm_segment_t old_fs = get_fs();
	struct timespec kts;
	int err;

	set_fs(KERNEL_DS);
2744
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2745
	set_fs(old_fs);
2746
	if (!err)
2747
		err = compat_put_timespec(&kts, up);
2748

2749 2750 2751
	return err;
}

2752
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2753 2754 2755 2756 2757
{
	struct ifreq __user *uifr;
	int err;

	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2758
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2759 2760
		return -EFAULT;

2761
	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2762 2763 2764
	if (err)
		return err;

2765
	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2766 2767 2768 2769 2770
		return -EFAULT;

	return 0;
}

2771
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2772
{
2773
	struct compat_ifconf ifc32;
2774 2775
	struct ifconf ifc;
	struct ifconf __user *uifc;
2776
	struct compat_ifreq __user *ifr32;
2777 2778 2779 2780
	struct ifreq __user *ifr;
	unsigned int i, j;
	int err;

2781
	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2782 2783
		return -EFAULT;

2784
	memset(&ifc, 0, sizeof(ifc));
2785 2786 2787 2788 2789 2790
	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 {
2791 2792
		size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
			sizeof(struct ifreq);
2793 2794 2795 2796
		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);
2797
		for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2798
			if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2799 2800 2801 2802 2803 2804 2805 2806
				return -EFAULT;
			ifr++;
			ifr32++;
		}
	}
	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
		return -EFAULT;

2807
	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2808 2809 2810 2811 2812 2813 2814 2815 2816
	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;
2817 2818 2819
	     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)))
2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
			return -EFAULT;
		ifr32++;
		ifr++;
	}

	if (ifc32.ifcbuf == 0) {
		/* Translate from 64-bit structure multiple to
		 * a 32-bit one.
		 */
		i = ifc.ifc_len;
2830
		i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2831 2832 2833 2834
		ifc32.ifc_len = i;
	} else {
		ifc32.ifc_len = i;
	}
2835
	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2836 2837 2838 2839 2840
		return -EFAULT;

	return 0;
}

2841
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2842
{
2843 2844 2845 2846
	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;
2847
	struct ifreq __user *ifr;
2848 2849
	u32 rule_cnt = 0, actual_rule_cnt;
	u32 ethcmd;
2850
	u32 data;
2851
	int ret;
2852

2853 2854
	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
		return -EFAULT;
2855

2856 2857 2858
	compat_rxnfc = compat_ptr(data);

	if (get_user(ethcmd, &compat_rxnfc->cmd))
2859 2860
		return -EFAULT;

2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877
	/* 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:
2878
	case ETHTOOL_SRXCLSRLINS:
2879 2880 2881 2882 2883 2884 2885 2886 2887
		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
2888
	rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2889 2890

	if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2891 2892
		return -EFAULT;

2893 2894
	if (put_user(convert_in ? rxnfc : compat_ptr(data),
		     &ifr->ifr_ifru.ifru_data))
2895 2896
		return -EFAULT;

2897
	if (convert_in) {
2898
		/* We expect there to be holes between fs.m_ext and
2899 2900
		 * fs.ring_cookie and at the end of fs, but nowhere else.
		 */
2901 2902 2903 2904
		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));
2905 2906 2907 2908 2909 2910 2911
		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
2912 2913
				 (void __user *)(&rxnfc->fs.m_ext + 1) -
				 (void __user *)rxnfc) ||
2914 2915
		    copy_in_user(&rxnfc->fs.ring_cookie,
				 &compat_rxnfc->fs.ring_cookie,
S
Stephen Hemminger 已提交
2916 2917
				 (void __user *)(&rxnfc->fs.location + 1) -
				 (void __user *)&rxnfc->fs.ring_cookie) ||
2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928
		    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
2929 2930
				 (const void __user *)(&rxnfc->fs.m_ext + 1) -
				 (const void __user *)rxnfc) ||
2931 2932
		    copy_in_user(&compat_rxnfc->fs.ring_cookie,
				 &rxnfc->fs.ring_cookie,
S
Stephen Hemminger 已提交
2933 2934
				 (const void __user *)(&rxnfc->fs.location + 1) -
				 (const void __user *)&rxnfc->fs.ring_cookie) ||
2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959
		    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;
2960 2961
}

2962 2963 2964 2965 2966 2967
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2968
	uifr = compat_alloc_user_space(sizeof(*uifr));
2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982
	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);
}

2983 2984
static int bond_ioctl(struct net *net, unsigned int cmd,
			 struct compat_ifreq __user *ifr32)
2985 2986 2987 2988 2989 2990 2991 2992 2993 2994
{
	struct ifreq kifr;
	mm_segment_t old_fs;
	int err;

	switch (cmd) {
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
2995
		if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2996 2997 2998
			return -EFAULT;

		old_fs = get_fs();
2999
		set_fs(KERNEL_DS);
3000 3001
		err = dev_ioctl(net, cmd,
				(struct ifreq __user __force *) &kifr);
3002
		set_fs(old_fs);
3003 3004 3005

		return err;
	default:
3006
		return -ENOIOCTLCMD;
3007
	}
3008 3009
}

3010 3011
/* 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,
3012
				 struct compat_ifreq __user *u_ifreq32)
3013 3014 3015 3016 3017 3018 3019 3020 3021
{
	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;
3022
	if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
3023 3024 3025 3026 3027 3028 3029 3030
		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;
3031
	if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
3032 3033
		return -EFAULT;

3034
	return dev_ioctl(net, cmd, u_ifreq64);
3035 3036
}

3037 3038
static int dev_ifsioc(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_ifreq __user *uifr32)
3039
{
3040
	struct ifreq __user *uifr;
3041 3042
	int err;

3043 3044 3045 3046 3047 3048
	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);

3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060
	if (!err) {
		switch (cmd) {
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFINDEX:
		case SIOCGIFADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFNETMASK:
3061
		case SIOCGIFPFLAGS:
3062
		case SIOCGIFTXQLEN:
3063 3064
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
3065
			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3066 3067 3068 3069 3070 3071 3072
				err = -EFAULT;
			break;
		}
	}
	return err;
}

3073 3074 3075 3076 3077 3078 3079 3080 3081 3082
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));
3083 3084 3085 3086 3087 3088
	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);
3089 3090 3091 3092
	if (err)
		return -EFAULT;

	old_fs = get_fs();
3093
	set_fs(KERNEL_DS);
3094
	err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
3095
	set_fs(old_fs);
3096 3097 3098

	if (cmd == SIOCGIFMAP && !err) {
		err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3099 3100 3101 3102 3103 3104
		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);
3105 3106 3107 3108 3109 3110
		if (err)
			err = -EFAULT;
	}
	return err;
}

3111
struct rtentry32 {
3112
	u32		rt_pad1;
3113 3114 3115
	struct sockaddr rt_dst;         /* target address               */
	struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
	struct sockaddr rt_genmask;     /* target network mask (IP)     */
3116 3117 3118 3119 3120 3121 3122
	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! */
3123
	/* char * */ u32 rt_dev;        /* forcing the device at add    */
3124 3125
	u32		rt_mtu;         /* per route MTU/Window         */
	u32		rt_window;      /* Window clamping              */
3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141
	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;
};

3142 3143
static int routing_ioctl(struct net *net, struct socket *sock,
			 unsigned int cmd, void __user *argp)
3144 3145 3146 3147 3148 3149 3150 3151 3152
{
	int ret;
	void *r = NULL;
	struct in6_rtmsg r6;
	struct rtentry r4;
	char devname[16];
	u32 rtdev;
	mm_segment_t old_fs = get_fs();

3153 3154
	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
		struct in6_rtmsg32 __user *ur6 = argp;
3155
		ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3156
			3 * sizeof(struct in6_addr));
3157 3158 3159 3160 3161 3162 3163
		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));
3164 3165 3166

		r = (void *) &r6;
	} else { /* ipv4 */
3167
		struct rtentry32 __user *ur4 = argp;
3168
		ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3169
					3 * sizeof(struct sockaddr));
3170 3171 3172 3173 3174 3175
		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));
3176
		if (rtdev) {
3177
			ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3178 3179
			r4.rt_dev = (char __user __force *)devname;
			devname[15] = 0;
3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190
		} else
			r4.rt_dev = NULL;

		r = (void *) &r4;
	}

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

3191
	set_fs(KERNEL_DS);
3192
	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3193
	set_fs(old_fs);
3194 3195 3196 3197 3198 3199 3200

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
3201
 * use compatible ioctls
3202
 */
3203
static int old_bridge_ioctl(compat_ulong_t __user *argp)
3204
{
3205
	compat_ulong_t tmp;
3206

3207
	if (get_user(tmp, argp))
3208 3209 3210 3211 3212 3213
		return -EFAULT;
	if (tmp == BRCTL_GET_VERSION)
		return BRCTL_VERSION + 1;
	return -EINVAL;
}

3214 3215 3216 3217 3218 3219
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);
3220

3221
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3222
		return compat_ifr_data_ioctl(net, cmd, argp);
3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233

	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);
3234 3235
	case SIOCWANDEV:
		return compat_siocwandev(net, argp);
3236 3237 3238
	case SIOCGIFMAP:
	case SIOCSIFMAP:
		return compat_sioc_ifmap(net, cmd, argp);
3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250
	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);
3251 3252
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
3253
	case SIOCSHWTSTAMP:
3254
	case SIOCGHWTSTAMP:
3255
		return compat_ifr_data_ioctl(net, cmd, argp);
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 3295 3296 3297

	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:
3298 3299 3300 3301
	case SIOCSIFNAME:
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
3302
		return dev_ifsioc(net, sock, cmd, argp);
3303

3304 3305 3306 3307
	case SIOCSARP:
	case SIOCGARP:
	case SIOCDARP:
	case SIOCATMARK:
3308 3309 3310
		return sock_do_ioctl(net, sock, cmd, arg);
	}

3311 3312
	return -ENOIOCTLCMD;
}
3313

3314
static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3315
			      unsigned long arg)
3316 3317 3318
{
	struct socket *sock = file->private_data;
	int ret = -ENOIOCTLCMD;
3319 3320 3321 3322 3323
	struct sock *sk;
	struct net *net;

	sk = sock->sk;
	net = sock_net(sk);
3324 3325 3326 3327

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

3328 3329 3330 3331
	if (ret == -ENOIOCTLCMD &&
	    (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
		ret = compat_wext_handle_ioctl(net, cmd, arg);

3332 3333 3334
	if (ret == -ENOIOCTLCMD)
		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);

3335 3336 3337 3338
	return ret;
}
#endif

3339 3340 3341 3342
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
	return sock->ops->bind(sock, addr, addrlen);
}
3343
EXPORT_SYMBOL(kernel_bind);
3344 3345 3346 3347 3348

int kernel_listen(struct socket *sock, int backlog)
{
	return sock->ops->listen(sock, backlog);
}
3349
EXPORT_SYMBOL(kernel_listen);
3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363

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);
3364
		*newsock = NULL;
3365 3366 3367 3368
		goto done;
	}

	(*newsock)->ops = sock->ops;
3369
	__module_get((*newsock)->ops->owner);
3370 3371 3372 3373

done:
	return err;
}
3374
EXPORT_SYMBOL(kernel_accept);
3375 3376

int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3377
		   int flags)
3378 3379 3380
{
	return sock->ops->connect(sock, addr, addrlen, flags);
}
3381
EXPORT_SYMBOL(kernel_connect);
3382 3383 3384 3385 3386 3387

int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 0);
}
3388
EXPORT_SYMBOL(kernel_getsockname);
3389 3390 3391 3392 3393 3394

int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 1);
}
3395
EXPORT_SYMBOL(kernel_getpeername);
3396 3397 3398 3399 3400

int kernel_getsockopt(struct socket *sock, int level, int optname,
			char *optval, int *optlen)
{
	mm_segment_t oldfs = get_fs();
3401 3402
	char __user *uoptval;
	int __user *uoptlen;
3403 3404
	int err;

3405 3406 3407
	uoptval = (char __user __force *) optval;
	uoptlen = (int __user __force *) optlen;

3408 3409
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3410
		err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3411
	else
3412 3413
		err = sock->ops->getsockopt(sock, level, optname, uoptval,
					    uoptlen);
3414 3415 3416
	set_fs(oldfs);
	return err;
}
3417
EXPORT_SYMBOL(kernel_getsockopt);
3418 3419

int kernel_setsockopt(struct socket *sock, int level, int optname,
3420
			char *optval, unsigned int optlen)
3421 3422
{
	mm_segment_t oldfs = get_fs();
3423
	char __user *uoptval;
3424 3425
	int err;

3426 3427
	uoptval = (char __user __force *) optval;

3428 3429
	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
3430
		err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3431
	else
3432
		err = sock->ops->setsockopt(sock, level, optname, uoptval,
3433 3434 3435 3436
					    optlen);
	set_fs(oldfs);
	return err;
}
3437
EXPORT_SYMBOL(kernel_setsockopt);
3438 3439 3440 3441 3442 3443 3444 3445 3446

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);
}
3447
EXPORT_SYMBOL(kernel_sendpage);
3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459

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;
}
3460
EXPORT_SYMBOL(kernel_sock_ioctl);
3461

3462 3463 3464 3465 3466
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
	return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);