linux - net/socket.c

3466 lines · 83.5 KiB

1	/*
2	* NET An implementation of the SOCKET network access protocol.
3	*
4	* Version: @(#)socket.c 1.1.93 18/02/95
5	*
6	* Authors: Orest Zborowski, <[email protected]>
7	* Ross Biro
8	* Fred N. van Kempen, <[email protected]>
9	*
10	* Fixes:
11	* Anonymous : NOTSOCK/BADF cleanup. Error fix in
12	* shutdown()
13	* Alan Cox : verify_area() fixes
14	* Alan Cox : Removed DDI
15	* Jonathan Kamens : SOCK_DGRAM reconnect bug
16	* Alan Cox : Moved a load of checks to the very
17	* top level.
18	* Alan Cox : Move address structures to/from user
19	* mode above the protocol layers.
20	* Rob Janssen : Allow 0 length sends.
21	* Alan Cox : Asynchronous I/O support (cribbed from the
22	* tty drivers).
23	* Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24	* Jeff Uphoff : Made max number of sockets command-line
25	* configurable.
26	* Matti Aarnio : Made the number of sockets dynamic,
27	* to be allocated when needed, and mr.
28	* Uphoff's max is used as max to be
29	* allowed to allocate.
30	* Linus : Argh. removed all the socket allocation
31	* altogether: it's in the inode now.
32	* Alan Cox : Made sock_alloc()/sock_release() public
33	* for NetROM and future kernel nfsd type
34	* stuff.
35	* Alan Cox : sendmsg/recvmsg basics.
36	* Tom Dyas : Export net symbols.
37	* Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38	* Alan Cox : Added thread locking to sys_* calls
39	* for sockets. May have errors at the
40	* moment.
41	* Kevin Buhr : Fixed the dumb errors in the above.
42	* Andi Kleen : Some small cleanups, optimizations,
43	* and fixed a copy_from_user() bug.
44	* Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
45	* Tigran Aivazian : Made listen(2) backlog sanity checks
46	* protocol-independent
47	*
48	*
49	* This program is free software; you can redistribute it and/or
50	* modify it under the terms of the GNU General Public License
51	* as published by the Free Software Foundation; either version
52	* 2 of the License, or (at your option) any later version.
53	*
54	*
55	* This module is effectively the top level interface to the BSD socket
56	* paradigm.
57	*
58	* Based upon Swansea University Computer Society NET3.039
59	*/
60
61	#include <linux/mm.h>
62	#include <linux/socket.h>
63	#include <linux/file.h>
64	#include <linux/net.h>
65	#include <linux/interrupt.h>
66	#include <linux/thread_info.h>
67	#include <linux/rcupdate.h>
68	#include <linux/netdevice.h>
69	#include <linux/proc_fs.h>
70	#include <linux/seq_file.h>
71	#include <linux/mutex.h>
72	#include <linux/if_bridge.h>
73	#include <linux/if_frad.h>
74	#include <linux/if_vlan.h>
75	#include <linux/ptp_classify.h>
76	#include <linux/init.h>
77	#include <linux/poll.h>
78	#include <linux/cache.h>
79	#include <linux/module.h>
80	#include <linux/highmem.h>
81	#include <linux/mount.h>
82	#include <linux/security.h>
83	#include <linux/syscalls.h>
84	#include <linux/compat.h>
85	#include <linux/kmod.h>
86	#include <linux/audit.h>
87	#include <linux/wireless.h>
88	#include <linux/nsproxy.h>
89	#include <linux/magic.h>
90	#include <linux/slab.h>
91	#include <linux/xattr.h>
92
93	#include <asm/uaccess.h>
94	#include <asm/unistd.h>
95
96	#include <net/compat.h>
97	#include <net/wext.h>
98	#include <net/cls_cgroup.h>
99
100	#include <net/sock.h>
101	#include <linux/netfilter.h>
102
103	#include <linux/if_tun.h>
104	#include <linux/ipv6_route.h>
105	#include <linux/route.h>
106	#include <linux/sockios.h>
107	#include <linux/atalk.h>
108	#include <net/busy_poll.h>
109
110	#ifdef CONFIG_NET_RX_BUSY_POLL
111	unsigned int sysctl_net_busy_read __read_mostly;
112	unsigned int sysctl_net_busy_poll __read_mostly;
113	#endif
114
115	static int sock_no_open(struct inode irrelevant, struct file dontcare);
116	static ssize_t sock_aio_read(struct kiocb iocb, const struct iovec iov,
117	unsigned long nr_segs, loff_t pos);
118	static ssize_t sock_aio_write(struct kiocb iocb, const struct iovec iov,
119	unsigned long nr_segs, loff_t pos);
120	static int sock_mmap(struct file file, struct vm_area_struct vma);
121
122	static int sock_close(struct inode inode, struct file file);
123	static unsigned int sock_poll(struct file *file,
124	struct poll_table_struct *wait);
125	static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
126	#ifdef CONFIG_COMPAT
127	static long compat_sock_ioctl(struct file *file,
128	unsigned int cmd, unsigned long arg);
129	#endif
130	static int sock_fasync(int fd, struct file *filp, int on);
131	static ssize_t sock_sendpage(struct file file, struct page page,
132	int offset, size_t size, loff_t *ppos, int more);
133	static ssize_t sock_splice_read(struct file file, loff_t ppos,
134	struct pipe_inode_info *pipe, size_t len,
135	unsigned int flags);
136
137	/*
138	* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
139	* in the operation structures but are done directly via the socketcall() multiplexor.
140	*/
141
142	static const struct file_operations socket_file_ops = {
143	.owner = THIS_MODULE,
144	.llseek = no_llseek,
145	.aio_read = sock_aio_read,
146	.aio_write = sock_aio_write,
147	.poll = sock_poll,
148	.unlocked_ioctl = sock_ioctl,
149	#ifdef CONFIG_COMPAT
150	.compat_ioctl = compat_sock_ioctl,
151	#endif
152	.mmap = sock_mmap,
153	.open = sock_no_open, /* special open code to disallow open via /proc */
154	.release = sock_close,
155	.fasync = sock_fasync,
156	.sendpage = sock_sendpage,
157	.splice_write = generic_splice_sendpage,
158	.splice_read = sock_splice_read,
159	};
160
161	/*
162	* The protocol list. Each protocol is registered in here.
163	*/
164
165	static DEFINE_SPINLOCK(net_family_lock);
166	static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
167
168	/*
169	* Statistics counters of the socket lists
170	*/
171
172	static DEFINE_PER_CPU(int, sockets_in_use);
173
174	/*
175	* Support routines.
176	* Move socket addresses back and forth across the kernel/user
177	* divide and look after the messy bits.
178	*/
179
180	/**
181	* move_addr_to_kernel - copy a socket address into kernel space
182	* @uaddr: Address in user space
183	* @kaddr: Address in kernel space
184	* @ulen: Length in user space
185	*
186	* The address is copied into kernel space. If the provided address is
187	* too long an error code of -EINVAL is returned. If the copy gives
188	* invalid addresses -EFAULT is returned. On a success 0 is returned.
189	*/
190
191	int move_addr_to_kernel(void __user uaddr, int ulen, struct sockaddr_storage kaddr)
192	{
193	if (ulen < 0 \|\| ulen > sizeof(struct sockaddr_storage))
194	return -EINVAL;
195	if (ulen == 0)
196	return 0;
197	if (copy_from_user(kaddr, uaddr, ulen))
198	return -EFAULT;
199	return audit_sockaddr(ulen, kaddr);
200	}
201
202	/**
203	* move_addr_to_user - copy an address to user space
204	* @kaddr: kernel space address
205	* @klen: length of address in kernel
206	* @uaddr: user space address
207	* @ulen: pointer to user length field
208	*
209	* The value pointed to by ulen on entry is the buffer length available.
210	* This is overwritten with the buffer space used. -EINVAL is returned
211	* if an overlong buffer is specified or a negative buffer size. -EFAULT
212	* is returned if either the buffer or the length field are not
213	* accessible.
214	* After copying the data up to the limit the user specifies, the true
215	* length of the data is written over the length limit the user
216	* specified. Zero is returned for a success.
217	*/
218
219	static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
220	void __user uaddr, int __user ulen)
221	{
222	int err;
223	int len;
224
225	BUG_ON(klen > sizeof(struct sockaddr_storage));
226	err = get_user(len, ulen);
227	if (err)
228	return err;
229	if (len > klen)
230	len = klen;
231	if (len < 0)
232	return -EINVAL;
233	if (len) {
234	if (audit_sockaddr(klen, kaddr))
235	return -ENOMEM;
236	if (copy_to_user(uaddr, kaddr, len))
237	return -EFAULT;
238	}
239	/*
240	* "fromlen shall refer to the value before truncation.."
241	* 1003.1g
242	*/
243	return __put_user(klen, ulen);
244	}
245
246	static struct kmem_cache *sock_inode_cachep __read_mostly;
247
248	static struct inode sock_alloc_inode(struct super_block sb)
249	{
250	struct socket_alloc *ei;
251	struct socket_wq *wq;
252
253	ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
254	if (!ei)
255	return NULL;
256	wq = kmalloc(sizeof(*wq), GFP_KERNEL);
257	if (!wq) {
258	kmem_cache_free(sock_inode_cachep, ei);
259	return NULL;
260	}
261	init_waitqueue_head(&wq->wait);
262	wq->fasync_list = NULL;
263	RCU_INIT_POINTER(ei->socket.wq, wq);
264
265	ei->socket.state = SS_UNCONNECTED;
266	ei->socket.flags = 0;
267	ei->socket.ops = NULL;
268	ei->socket.sk = NULL;
269	ei->socket.file = NULL;
270
271	return &ei->vfs_inode;
272	}
273
274	static void sock_destroy_inode(struct inode *inode)
275	{
276	struct socket_alloc *ei;
277	struct socket_wq *wq;
278
279	ei = container_of(inode, struct socket_alloc, vfs_inode);
280	wq = rcu_dereference_protected(ei->socket.wq, 1);
281	kfree_rcu(wq, rcu);
282	kmem_cache_free(sock_inode_cachep, ei);
283	}
284
285	static void init_once(void *foo)
286	{
287	struct socket_alloc ei = (struct socket_alloc )foo;
288
289	inode_init_once(&ei->vfs_inode);
290	}
291
292	static int init_inodecache(void)
293	{
294	sock_inode_cachep = kmem_cache_create("sock_inode_cache",
295	sizeof(struct socket_alloc),
296	0,
297	(SLAB_HWCACHE_ALIGN \|
298	SLAB_RECLAIM_ACCOUNT \|
299	SLAB_MEM_SPREAD),
300	init_once);
301	if (sock_inode_cachep == NULL)
302	return -ENOMEM;
303	return 0;
304	}
305
306	static const struct super_operations sockfs_ops = {
307	.alloc_inode = sock_alloc_inode,
308	.destroy_inode = sock_destroy_inode,
309	.statfs = simple_statfs,
310	};
311
312	/*
313	* sockfs_dname() is called from d_path().
314	*/
315	static char sockfs_dname(struct dentry dentry, char *buffer, int buflen)
316	{
317	return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
318	dentry->d_inode->i_ino);
319	}
320
321	static const struct dentry_operations sockfs_dentry_operations = {
322	.d_dname = sockfs_dname,
323	};
324
325	static struct dentry sockfs_mount(struct file_system_type fs_type,
326	int flags, const char dev_name, void data)
327	{
328	return mount_pseudo(fs_type, "socket:", &sockfs_ops,
329	&sockfs_dentry_operations, SOCKFS_MAGIC);
330	}
331
332	static struct vfsmount *sock_mnt __read_mostly;
333
334	static struct file_system_type sock_fs_type = {
335	.name = "sockfs",
336	.mount = sockfs_mount,
337	.kill_sb = kill_anon_super,
338	};
339
340	/*
341	* Obtains the first available file descriptor and sets it up for use.
342	*
343	* These functions create file structures and maps them to fd space
344	* of the current process. On success it returns file descriptor
345	* and file struct implicitly stored in sock->file.
346	* Note that another thread may close file descriptor before we return
347	* from this function. We use the fact that now we do not refer
348	* to socket after mapping. If one day we will need it, this
349	* function will increment ref. count on file by 1.
350	*
351	* In any case returned fd MAY BE not valid!
352	* This race condition is unavoidable
353	* with shared fd spaces, we cannot solve it inside kernel,
354	* but we take care of internal coherence yet.
355	*/
356
357	struct file sock_alloc_file(struct socket sock, int flags, const char *dname)
358	{
359	struct qstr name = { .name = "" };
360	struct path path;
361	struct file *file;
362
363	if (dname) {
364	name.name = dname;
365	name.len = strlen(name.name);
366	} else if (sock->sk) {
367	name.name = sock->sk->sk_prot_creator->name;
368	name.len = strlen(name.name);
369	}
370	path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
371	if (unlikely(!path.dentry))
372	return ERR_PTR(-ENOMEM);
373	path.mnt = mntget(sock_mnt);
374
375	d_instantiate(path.dentry, SOCK_INODE(sock));
376	SOCK_INODE(sock)->i_fop = &socket_file_ops;
377
378	file = alloc_file(&path, FMODE_READ \| FMODE_WRITE,
379	&socket_file_ops);
380	if (unlikely(IS_ERR(file))) {
381	/* drop dentry, keep inode */
382	ihold(path.dentry->d_inode);
383	path_put(&path);
384	return file;
385	}
386
387	sock->file = file;
388	file->f_flags = O_RDWR \| (flags & O_NONBLOCK);
389	file->private_data = sock;
390	return file;
391	}
392	EXPORT_SYMBOL(sock_alloc_file);
393
394	static int sock_map_fd(struct socket *sock, int flags)
395	{
396	struct file *newfile;
397	int fd = get_unused_fd_flags(flags);
398	if (unlikely(fd < 0))
399	return fd;
400
401	newfile = sock_alloc_file(sock, flags, NULL);
402	if (likely(!IS_ERR(newfile))) {
403	fd_install(fd, newfile);
404	return fd;
405	}
406
407	put_unused_fd(fd);
408	return PTR_ERR(newfile);
409	}
410
411	struct socket sock_from_file(struct file file, int *err)
412	{
413	if (file->f_op == &socket_file_ops)
414	return file->private_data; /* set in sock_map_fd */
415
416	*err = -ENOTSOCK;
417	return NULL;
418	}
419	EXPORT_SYMBOL(sock_from_file);
420
421	/**
422	* sockfd_lookup - Go from a file number to its socket slot
423	* @fd: file handle
424	* @err: pointer to an error code return
425	*
426	* The file handle passed in is locked and the socket it is bound
427	* too is returned. If an error occurs the err pointer is overwritten
428	* with a negative errno code and NULL is returned. The function checks
429	* for both invalid handles and passing a handle which is not a socket.
430	*
431	* On a success the socket object pointer is returned.
432	*/
433
434	struct socket sockfd_lookup(int fd, int err)
435	{
436	struct file *file;
437	struct socket *sock;
438
439	file = fget(fd);
440	if (!file) {
441	*err = -EBADF;
442	return NULL;
443	}
444
445	sock = sock_from_file(file, err);
446	if (!sock)
447	fput(file);
448	return sock;
449	}
450	EXPORT_SYMBOL(sockfd_lookup);
451
452	static struct socket sockfd_lookup_light(int fd, int err, int *fput_needed)
453	{
454	struct fd f = fdget(fd);
455	struct socket *sock;
456
457	*err = -EBADF;
458	if (f.file) {
459	sock = sock_from_file(f.file, err);
460	if (likely(sock)) {
461	*fput_needed = f.flags;
462	return sock;
463	}
464	fdput(f);
465	}
466	return NULL;
467	}
468
469	#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
470	#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
471	#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
472	static ssize_t sockfs_getxattr(struct dentry *dentry,
473	const char name, void value, size_t size)
474	{
475	const char *proto_name;
476	size_t proto_size;
477	int error;
478
479	error = -ENODATA;
480	if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
481	proto_name = dentry->d_name.name;
482	proto_size = strlen(proto_name);
483
484	if (value) {
485	error = -ERANGE;
486	if (proto_size + 1 > size)
487	goto out;
488
489	strncpy(value, proto_name, proto_size + 1);
490	}
491	error = proto_size + 1;
492	}
493
494	out:
495	return error;
496	}
497
498	static ssize_t sockfs_listxattr(struct dentry dentry, char buffer,
499	size_t size)
500	{
501	ssize_t len;
502	ssize_t used = 0;
503
504	len = security_inode_listsecurity(dentry->d_inode, buffer, size);
505	if (len < 0)
506	return len;
507	used += len;
508	if (buffer) {
509	if (size < used)
510	return -ERANGE;
511	buffer += len;
512	}
513
514	len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
515	used += len;
516	if (buffer) {
517	if (size < used)
518	return -ERANGE;
519	memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
520	buffer += len;
521	}
522
523	return used;
524	}
525
526	static const struct inode_operations sockfs_inode_ops = {
527	.getxattr = sockfs_getxattr,
528	.listxattr = sockfs_listxattr,
529	};
530
531	/**
532	* sock_alloc - allocate a socket
533	*
534	* Allocate a new inode and socket object. The two are bound together
535	* and initialised. The socket is then returned. If we are out of inodes
536	* NULL is returned.
537	*/
538
539	static struct socket *sock_alloc(void)
540	{
541	struct inode *inode;
542	struct socket *sock;
543
544	inode = new_inode_pseudo(sock_mnt->mnt_sb);
545	if (!inode)
546	return NULL;
547
548	sock = SOCKET_I(inode);
549
550	kmemcheck_annotate_bitfield(sock, type);
551	inode->i_ino = get_next_ino();
552	inode->i_mode = S_IFSOCK \| S_IRWXUGO;
553	inode->i_uid = current_fsuid();
554	inode->i_gid = current_fsgid();
555	inode->i_op = &sockfs_inode_ops;
556
557	this_cpu_add(sockets_in_use, 1);
558	return sock;
559	}
560
561	/*
562	* In theory you can't get an open on this inode, but /proc provides
563	* a back door. Remember to keep it shut otherwise you'll let the
564	* creepy crawlies in.
565	*/
566
567	static int sock_no_open(struct inode irrelevant, struct file dontcare)
568	{
569	return -ENXIO;
570	}
571
572	const struct file_operations bad_sock_fops = {
573	.owner = THIS_MODULE,
574	.open = sock_no_open,
575	.llseek = noop_llseek,
576	};
577
578	/**
579	* sock_release - close a socket
580	* @sock: socket to close
581	*
582	* The socket is released from the protocol stack if it has a release
583	* callback, and the inode is then released if the socket is bound to
584	* an inode not a file.
585	*/
586
587	void sock_release(struct socket *sock)
588	{
589	if (sock->ops) {
590	struct module *owner = sock->ops->owner;
591
592	sock->ops->release(sock);
593	sock->ops = NULL;
594	module_put(owner);
595	}
596
597	if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
598	pr_err("%s: fasync list not empty!\n", __func__);
599
600	if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
601	return;
602
603	this_cpu_sub(sockets_in_use, 1);
604	if (!sock->file) {
605	iput(SOCK_INODE(sock));
606	return;
607	}
608	sock->file = NULL;
609	}
610	EXPORT_SYMBOL(sock_release);
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	if (sock_flag(sk, SOCK_WIFI_STATUS))
620	*tx_flags \|= SKBTX_WIFI_STATUS;
621	}
622	EXPORT_SYMBOL(sock_tx_timestamp);
623
624	static inline int __sock_sendmsg_nosec(struct kiocb iocb, struct socket sock,
625	struct msghdr *msg, size_t size)
626	{
627	struct sock_iocb *si = kiocb_to_siocb(iocb);
628
629	si->sock = sock;
630	si->scm = NULL;
631	si->msg = msg;
632	si->size = size;
633
634	return sock->ops->sendmsg(iocb, sock, msg, size);
635	}
636
637	static inline int __sock_sendmsg(struct kiocb iocb, struct socket sock,
638	struct msghdr *msg, size_t size)
639	{
640	int err = security_socket_sendmsg(sock, msg, size);
641
642	return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
643	}
644
645	int sock_sendmsg(struct socket sock, struct msghdr msg, size_t size)
646	{
647	struct kiocb iocb;
648	struct sock_iocb siocb;
649	int ret;
650
651	init_sync_kiocb(&iocb, NULL);
652	iocb.private = &siocb;
653	ret = __sock_sendmsg(&iocb, sock, msg, size);
654	if (-EIOCBQUEUED == ret)
655	ret = wait_on_sync_kiocb(&iocb);
656	return ret;
657	}
658	EXPORT_SYMBOL(sock_sendmsg);
659
660	static int sock_sendmsg_nosec(struct socket sock, struct msghdr msg, size_t size)
661	{
662	struct kiocb iocb;
663	struct sock_iocb siocb;
664	int ret;
665
666	init_sync_kiocb(&iocb, NULL);
667	iocb.private = &siocb;
668	ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
669	if (-EIOCBQUEUED == ret)
670	ret = wait_on_sync_kiocb(&iocb);
671	return ret;
672	}
673
674	int kernel_sendmsg(struct socket sock, struct msghdr msg,
675	struct kvec *vec, size_t num, size_t size)
676	{
677	mm_segment_t oldfs = get_fs();
678	int result;
679
680	set_fs(KERNEL_DS);
681	/*
682	* the following is safe, since for compiler definitions of kvec and
683	* iovec are identical, yielding the same in-core layout and alignment
684	*/
685	msg->msg_iov = (struct iovec *)vec;
686	msg->msg_iovlen = num;
687	result = sock_sendmsg(sock, msg, size);
688	set_fs(oldfs);
689	return result;
690	}
691	EXPORT_SYMBOL(kernel_sendmsg);
692
693	/*
694	* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
695	*/
696	void __sock_recv_timestamp(struct msghdr msg, struct sock sk,
697	struct sk_buff *skb)
698	{
699	int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
700	struct timespec ts[3];
701	int empty = 1;
702	struct skb_shared_hwtstamps *shhwtstamps =
703	skb_hwtstamps(skb);
704
705	/* Race occurred between timestamp enabling and packet
706	receiving. Fill in the current time for now. */
707	if (need_software_tstamp && skb->tstamp.tv64 == 0)
708	__net_timestamp(skb);
709
710	if (need_software_tstamp) {
711	if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
712	struct timeval tv;
713	skb_get_timestamp(skb, &tv);
714	put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
715	sizeof(tv), &tv);
716	} 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	if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
726	ktime_to_timespec_cond(skb->tstamp, ts + 0))
727	empty = 0;
728	if (shhwtstamps) {
729	if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
730	ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
731	empty = 0;
732	if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
733	ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
734	empty = 0;
735	}
736	if (!empty)
737	put_cmsg(msg, SOL_SOCKET,
738	SCM_TIMESTAMPING, sizeof(ts), &ts);
739	}
740	EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
741
742	void __sock_recv_wifi_status(struct msghdr msg, struct sock sk,
743	struct sk_buff *skb)
744	{
745	int ack;
746
747	if (!sock_flag(sk, SOCK_WIFI_STATUS))
748	return;
749	if (!skb->wifi_acked_valid)
750	return;
751
752	ack = skb->wifi_acked;
753
754	put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
755	}
756	EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
757
758	static inline void sock_recv_drops(struct msghdr msg, struct sock sk,
759	struct sk_buff *skb)
760	{
761	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
762	put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
763	sizeof(__u32), &skb->dropcount);
764	}
765
766	void __sock_recv_ts_and_drops(struct msghdr msg, struct sock sk,
767	struct sk_buff *skb)
768	{
769	sock_recv_timestamp(msg, sk, skb);
770	sock_recv_drops(msg, sk, skb);
771	}
772	EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
773
774	static inline int __sock_recvmsg_nosec(struct kiocb iocb, struct socket sock,
775	struct msghdr *msg, size_t size, int flags)
776	{
777	struct sock_iocb *si = kiocb_to_siocb(iocb);
778
779	si->sock = sock;
780	si->scm = NULL;
781	si->msg = msg;
782	si->size = size;
783	si->flags = flags;
784
785	return sock->ops->recvmsg(iocb, sock, msg, size, flags);
786	}
787
788	static inline int __sock_recvmsg(struct kiocb iocb, struct socket sock,
789	struct msghdr *msg, size_t size, int flags)
790	{
791	int err = security_socket_recvmsg(sock, msg, size, flags);
792
793	return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
794	}
795
796	int sock_recvmsg(struct socket sock, struct msghdr msg,
797	size_t size, int flags)
798	{
799	struct kiocb iocb;
800	struct sock_iocb siocb;
801	int ret;
802
803	init_sync_kiocb(&iocb, NULL);
804	iocb.private = &siocb;
805	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
806	if (-EIOCBQUEUED == ret)
807	ret = wait_on_sync_kiocb(&iocb);
808	return ret;
809	}
810	EXPORT_SYMBOL(sock_recvmsg);
811
812	static int sock_recvmsg_nosec(struct socket sock, struct msghdr msg,
813	size_t size, int flags)
814	{
815	struct kiocb iocb;
816	struct sock_iocb siocb;
817	int ret;
818
819	init_sync_kiocb(&iocb, NULL);
820	iocb.private = &siocb;
821	ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
822	if (-EIOCBQUEUED == ret)
823	ret = wait_on_sync_kiocb(&iocb);
824	return ret;
825	}
826
827	/**
828	* kernel_recvmsg - Receive a message from a socket (kernel space)
829	* @sock: The socket to receive the message from
830	* @msg: Received message
831	* @vec: Input s/g array for message data
832	* @num: Size of input s/g array
833	* @size: Number of bytes to read
834	* @flags: Message flags (MSG_DONTWAIT, etc...)
835	*
836	* On return the msg structure contains the scatter/gather array passed in the
837	* vec argument. The array is modified so that it consists of the unfilled
838	* portion of the original array.
839	*
840	* The returned value is the total number of bytes received, or an error.
841	*/
842	int kernel_recvmsg(struct socket sock, struct msghdr msg,
843	struct kvec *vec, size_t num, size_t size, int flags)
844	{
845	mm_segment_t oldfs = get_fs();
846	int result;
847
848	set_fs(KERNEL_DS);
849	/*
850	* the following is safe, since for compiler definitions of kvec and
851	* iovec are identical, yielding the same in-core layout and alignment
852	*/
853	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
854	result = sock_recvmsg(sock, msg, size, flags);
855	set_fs(oldfs);
856	return result;
857	}
858	EXPORT_SYMBOL(kernel_recvmsg);
859
860	static ssize_t sock_sendpage(struct file file, struct page page,
861	int offset, size_t size, loff_t *ppos, int more)
862	{
863	struct socket *sock;
864	int flags;
865
866	sock = file->private_data;
867
868	flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
869	/* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
870	flags \|= more;
871
872	return kernel_sendpage(sock, page, offset, size, flags);
873	}
874
875	static ssize_t sock_splice_read(struct file file, loff_t ppos,
876	struct pipe_inode_info *pipe, size_t len,
877	unsigned int flags)
878	{
879	struct socket *sock = file->private_data;
880
881	if (unlikely(!sock->ops->splice_read))
882	return -EINVAL;
883
884	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
885	}
886
887	static struct sock_iocb alloc_sock_iocb(struct kiocb iocb,
888	struct sock_iocb *siocb)
889	{
890	if (!is_sync_kiocb(iocb))
891	BUG();
892
893	siocb->kiocb = iocb;
894	iocb->private = siocb;
895	return siocb;
896	}
897
898	static ssize_t do_sock_read(struct msghdr msg, struct kiocb iocb,
899	struct file file, const struct iovec iov,
900	unsigned long nr_segs)
901	{
902	struct socket *sock = file->private_data;
903	size_t size = 0;
904	int i;
905
906	for (i = 0; i < nr_segs; i++)
907	size += iov[i].iov_len;
908
909	msg->msg_name = NULL;
910	msg->msg_namelen = 0;
911	msg->msg_control = NULL;
912	msg->msg_controllen = 0;
913	msg->msg_iov = (struct iovec *)iov;
914	msg->msg_iovlen = nr_segs;
915	msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
916
917	return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
918	}
919
920	static ssize_t sock_aio_read(struct kiocb iocb, const struct iovec iov,
921	unsigned long nr_segs, loff_t pos)
922	{
923	struct sock_iocb siocb, *x;
924
925	if (pos != 0)
926	return -ESPIPE;
927
928	if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
929	return 0;
930
931
932	x = alloc_sock_iocb(iocb, &siocb);
933	if (!x)
934	return -ENOMEM;
935	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
936	}
937
938	static ssize_t do_sock_write(struct msghdr msg, struct kiocb iocb,
939	struct file file, const struct iovec iov,
940	unsigned long nr_segs)
941	{
942	struct socket *sock = file->private_data;
943	size_t size = 0;
944	int i;
945
946	for (i = 0; i < nr_segs; i++)
947	size += iov[i].iov_len;
948
949	msg->msg_name = NULL;
950	msg->msg_namelen = 0;
951	msg->msg_control = NULL;
952	msg->msg_controllen = 0;
953	msg->msg_iov = (struct iovec *)iov;
954	msg->msg_iovlen = nr_segs;
955	msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
956	if (sock->type == SOCK_SEQPACKET)
957	msg->msg_flags \|= MSG_EOR;
958
959	return __sock_sendmsg(iocb, sock, msg, size);
960	}
961
962	static ssize_t sock_aio_write(struct kiocb iocb, const struct iovec iov,
963	unsigned long nr_segs, loff_t pos)
964	{
965	struct sock_iocb siocb, *x;
966
967	if (pos != 0)
968	return -ESPIPE;
969
970	x = alloc_sock_iocb(iocb, &siocb);
971	if (!x)
972	return -ENOMEM;
973
974	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
975	}
976
977	/*
978	* Atomic setting of ioctl hooks to avoid race
979	* with module unload.
980	*/
981
982	static DEFINE_MUTEX(br_ioctl_mutex);
983	static int (br_ioctl_hook) (struct net , unsigned int cmd, void __user *arg);
984
985	void brioctl_set(int (hook) (struct net , unsigned int, void __user *))
986	{
987	mutex_lock(&br_ioctl_mutex);
988	br_ioctl_hook = hook;
989	mutex_unlock(&br_ioctl_mutex);
990	}
991	EXPORT_SYMBOL(brioctl_set);
992
993	static DEFINE_MUTEX(vlan_ioctl_mutex);
994	static int (vlan_ioctl_hook) (struct net , void __user *arg);
995
996	void vlan_ioctl_set(int (hook) (struct net , void __user *))
997	{
998	mutex_lock(&vlan_ioctl_mutex);
999	vlan_ioctl_hook = hook;
1000	mutex_unlock(&vlan_ioctl_mutex);
1001	}
1002	EXPORT_SYMBOL(vlan_ioctl_set);
1003
1004	static DEFINE_MUTEX(dlci_ioctl_mutex);
1005	static int (dlci_ioctl_hook) (unsigned int, void __user );
1006
1007	void dlci_ioctl_set(int (hook) (unsigned int, void __user ))
1008	{
1009	mutex_lock(&dlci_ioctl_mutex);
1010	dlci_ioctl_hook = hook;
1011	mutex_unlock(&dlci_ioctl_mutex);
1012	}
1013	EXPORT_SYMBOL(dlci_ioctl_set);
1014
1015	static long sock_do_ioctl(struct net net, struct socket sock,
1016	unsigned int cmd, unsigned long arg)
1017	{
1018	int err;
1019	void __user argp = (void __user )arg;
1020
1021	err = sock->ops->ioctl(sock, cmd, arg);
1022
1023	/*
1024	* If this ioctl is unknown try to hand it down
1025	* to the NIC driver.
1026	*/
1027	if (err == -ENOIOCTLCMD)
1028	err = dev_ioctl(net, cmd, argp);
1029
1030	return err;
1031	}
1032
1033	/*
1034	* With an ioctl, arg may well be a user mode pointer, but we don't know
1035	* what to do with it - that's up to the protocol still.
1036	*/
1037
1038	static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1039	{
1040	struct socket *sock;
1041	struct sock *sk;
1042	void __user argp = (void __user )arg;
1043	int pid, err;
1044	struct net *net;
1045
1046	sock = file->private_data;
1047	sk = sock->sk;
1048	net = sock_net(sk);
1049	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1050	err = dev_ioctl(net, cmd, argp);
1051	} else
1052	#ifdef CONFIG_WEXT_CORE
1053	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1054	err = dev_ioctl(net, cmd, argp);
1055	} else
1056	#endif
1057	switch (cmd) {
1058	case FIOSETOWN:
1059	case SIOCSPGRP:
1060	err = -EFAULT;
1061	if (get_user(pid, (int __user *)argp))
1062	break;
1063	err = f_setown(sock->file, pid, 1);
1064	break;
1065	case FIOGETOWN:
1066	case SIOCGPGRP:
1067	err = put_user(f_getown(sock->file),
1068	(int __user *)argp);
1069	break;
1070	case SIOCGIFBR:
1071	case SIOCSIFBR:
1072	case SIOCBRADDBR:
1073	case SIOCBRDELBR:
1074	err = -ENOPKG;
1075	if (!br_ioctl_hook)
1076	request_module("bridge");
1077
1078	mutex_lock(&br_ioctl_mutex);
1079	if (br_ioctl_hook)
1080	err = br_ioctl_hook(net, cmd, argp);
1081	mutex_unlock(&br_ioctl_mutex);
1082	break;
1083	case SIOCGIFVLAN:
1084	case SIOCSIFVLAN:
1085	err = -ENOPKG;
1086	if (!vlan_ioctl_hook)
1087	request_module("8021q");
1088
1089	mutex_lock(&vlan_ioctl_mutex);
1090	if (vlan_ioctl_hook)
1091	err = vlan_ioctl_hook(net, argp);
1092	mutex_unlock(&vlan_ioctl_mutex);
1093	break;
1094	case SIOCADDDLCI:
1095	case SIOCDELDLCI:
1096	err = -ENOPKG;
1097	if (!dlci_ioctl_hook)
1098	request_module("dlci");
1099
1100	mutex_lock(&dlci_ioctl_mutex);
1101	if (dlci_ioctl_hook)
1102	err = dlci_ioctl_hook(cmd, argp);
1103	mutex_unlock(&dlci_ioctl_mutex);
1104	break;
1105	default:
1106	err = sock_do_ioctl(net, sock, cmd, arg);
1107	break;
1108	}
1109	return err;
1110	}
1111
1112	int sock_create_lite(int family, int type, int protocol, struct socket **res)
1113	{
1114	int err;
1115	struct socket *sock = NULL;
1116
1117	err = security_socket_create(family, type, protocol, 1);
1118	if (err)
1119	goto out;
1120
1121	sock = sock_alloc();
1122	if (!sock) {
1123	err = -ENOMEM;
1124	goto out;
1125	}
1126
1127	sock->type = type;
1128	err = security_socket_post_create(sock, family, type, protocol, 1);
1129	if (err)
1130	goto out_release;
1131
1132	out:
1133	*res = sock;
1134	return err;
1135	out_release:
1136	sock_release(sock);
1137	sock = NULL;
1138	goto out;
1139	}
1140	EXPORT_SYMBOL(sock_create_lite);
1141
1142	/* No kernel lock held - perfect */
1143	static unsigned int sock_poll(struct file file, poll_table wait)
1144	{
1145	unsigned int busy_flag = 0;
1146	struct socket *sock;
1147
1148	/*
1149	* We can't return errors to poll, so it's either yes or no.
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	if (wait && (wait->_key & POLL_BUSY_LOOP))
1159	sk_busy_loop(sock->sk, 1);
1160	}
1161
1162	return busy_flag \| sock->ops->poll(file, sock, wait);
1163	}
1164
1165	static int sock_mmap(struct file file, struct vm_area_struct vma)
1166	{
1167	struct socket *sock = file->private_data;
1168
1169	return sock->ops->mmap(file, sock, vma);
1170	}
1171
1172	static int sock_close(struct inode inode, struct file filp)
1173	{
1174	sock_release(SOCKET_I(inode));
1175	return 0;
1176	}
1177
1178	/*
1179	* Update the socket async list
1180	*
1181	* Fasync_list locking strategy.
1182	*
1183	* 1. fasync_list is modified only under process context socket lock
1184	* i.e. under semaphore.
1185	* 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1186	* or under socket lock
1187	*/
1188
1189	static int sock_fasync(int fd, struct file *filp, int on)
1190	{
1191	struct socket *sock = filp->private_data;
1192	struct sock *sk = sock->sk;
1193	struct socket_wq *wq;
1194
1195	if (sk == NULL)
1196	return -EINVAL;
1197
1198	lock_sock(sk);
1199	wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1200	fasync_helper(fd, filp, on, &wq->fasync_list);
1201
1202	if (!wq->fasync_list)
1203	sock_reset_flag(sk, SOCK_FASYNC);
1204	else
1205	sock_set_flag(sk, SOCK_FASYNC);
1206
1207	release_sock(sk);
1208	return 0;
1209	}
1210
1211	/* This function may be called only under socket lock or callback_lock or rcu_lock */
1212
1213	int sock_wake_async(struct socket *sock, int how, int band)
1214	{
1215	struct socket_wq *wq;
1216
1217	if (!sock)
1218	return -1;
1219	rcu_read_lock();
1220	wq = rcu_dereference(sock->wq);
1221	if (!wq \|\| !wq->fasync_list) {
1222	rcu_read_unlock();
1223	return -1;
1224	}
1225	switch (how) {
1226	case SOCK_WAKE_WAITD:
1227	if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1228	break;
1229	goto call_kill;
1230	case SOCK_WAKE_SPACE:
1231	if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1232	break;
1233	/* fall through */
1234	case SOCK_WAKE_IO:
1235	call_kill:
1236	kill_fasync(&wq->fasync_list, SIGIO, band);
1237	break;
1238	case SOCK_WAKE_URG:
1239	kill_fasync(&wq->fasync_list, SIGURG, band);
1240	}
1241	rcu_read_unlock();
1242	return 0;
1243	}
1244	EXPORT_SYMBOL(sock_wake_async);
1245
1246	int __sock_create(struct net *net, int family, int type, int protocol,
1247	struct socket **res, int kern)
1248	{
1249	int err;
1250	struct socket *sock;
1251	const struct net_proto_family *pf;
1252
1253	/*
1254	* Check protocol is in range
1255	*/
1256	if (family < 0 \|\| family >= NPROTO)
1257	return -EAFNOSUPPORT;
1258	if (type < 0 \|\| type >= SOCK_MAX)
1259	return -EINVAL;
1260
1261	/* Compatibility.
1262
1263	This uglymoron is moved from INET layer to here to avoid
1264	deadlock in module load.
1265	*/
1266	if (family == PF_INET && type == SOCK_PACKET) {
1267	static int warned;
1268	if (!warned) {
1269	warned = 1;
1270	pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1271	current->comm);
1272	}
1273	family = PF_PACKET;
1274	}
1275
1276	err = security_socket_create(family, type, protocol, kern);
1277	if (err)
1278	return err;
1279
1280	/*
1281	* Allocate the socket and allow the family to set things up. if
1282	* the protocol is 0, the family is instructed to select an appropriate
1283	* default.
1284	*/
1285	sock = sock_alloc();
1286	if (!sock) {
1287	net_warn_ratelimited("socket: no more sockets\n");
1288	return -ENFILE; /* Not exactly a match, but its the
1289	closest posix thing */
1290	}
1291
1292	sock->type = type;
1293
1294	#ifdef CONFIG_MODULES
1295	/* Attempt to load a protocol module if the find failed.
1296	*
1297	* 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1298	* requested real, full-featured networking support upon configuration.
1299	* Otherwise module support will break!
1300	*/
1301	if (rcu_access_pointer(net_families[family]) == NULL)
1302	request_module("net-pf-%d", family);
1303	#endif
1304
1305	rcu_read_lock();
1306	pf = rcu_dereference(net_families[family]);
1307	err = -EAFNOSUPPORT;
1308	if (!pf)
1309	goto out_release;
1310
1311	/*
1312	* We will call the ->create function, that possibly is in a loadable
1313	* module, so we have to bump that loadable module refcnt first.
1314	*/
1315	if (!try_module_get(pf->owner))
1316	goto out_release;
1317
1318	/* Now protected by module ref count */
1319	rcu_read_unlock();
1320
1321	err = pf->create(net, sock, protocol, kern);
1322	if (err < 0)
1323	goto out_module_put;
1324
1325	/*
1326	* Now to bump the refcnt of the [loadable] module that owns this
1327	* socket at sock_release time we decrement its refcnt.
1328	*/
1329	if (!try_module_get(sock->ops->owner))
1330	goto out_module_busy;
1331
1332	/*
1333	* Now that we're done with the ->create function, the [loadable]
1334	* module can have its refcnt decremented
1335	*/
1336	module_put(pf->owner);
1337	err = security_socket_post_create(sock, family, type, protocol, kern);
1338	if (err)
1339	goto out_sock_release;
1340	*res = sock;
1341
1342	return 0;
1343
1344	out_module_busy:
1345	err = -EAFNOSUPPORT;
1346	out_module_put:
1347	sock->ops = NULL;
1348	module_put(pf->owner);
1349	out_sock_release:
1350	sock_release(sock);
1351	return err;
1352
1353	out_release:
1354	rcu_read_unlock();
1355	goto out_sock_release;
1356	}
1357	EXPORT_SYMBOL(__sock_create);
1358
1359	int sock_create(int family, int type, int protocol, struct socket **res)
1360	{
1361	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1362	}
1363	EXPORT_SYMBOL(sock_create);
1364
1365	int sock_create_kern(int family, int type, int protocol, struct socket **res)
1366	{
1367	return __sock_create(&init_net, family, type, protocol, res, 1);
1368	}
1369	EXPORT_SYMBOL(sock_create_kern);
1370
1371	SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1372	{
1373	int retval;
1374	struct socket *sock;
1375	int flags;
1376
1377	/* Check the SOCK_* constants for consistency. */
1378	BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1379	BUILD_BUG_ON((SOCK_MAX \| SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1380	BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1381	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1382
1383	flags = type & ~SOCK_TYPE_MASK;
1384	if (flags & ~(SOCK_CLOEXEC \| SOCK_NONBLOCK))
1385	return -EINVAL;
1386	type &= SOCK_TYPE_MASK;
1387
1388	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1389	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1390
1391	retval = sock_create(family, type, protocol, &sock);
1392	if (retval < 0)
1393	goto out;
1394
1395	retval = sock_map_fd(sock, flags & (O_CLOEXEC \| O_NONBLOCK));
1396	if (retval < 0)
1397	goto out_release;
1398
1399	out:
1400	/* It may be already another descriptor 8) Not kernel problem. */
1401	return retval;
1402
1403	out_release:
1404	sock_release(sock);
1405	return retval;
1406	}
1407
1408	/*
1409	* Create a pair of connected sockets.
1410	*/
1411
1412	SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1413	int __user *, usockvec)
1414	{
1415	struct socket sock1, sock2;
1416	int fd1, fd2, err;
1417	struct file newfile1, newfile2;
1418	int flags;
1419
1420	flags = type & ~SOCK_TYPE_MASK;
1421	if (flags & ~(SOCK_CLOEXEC \| SOCK_NONBLOCK))
1422	return -EINVAL;
1423	type &= SOCK_TYPE_MASK;
1424
1425	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1426	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1427
1428	/*
1429	* Obtain the first socket and check if the underlying protocol
1430	* supports the socketpair call.
1431	*/
1432
1433	err = sock_create(family, type, protocol, &sock1);
1434	if (err < 0)
1435	goto out;
1436
1437	err = sock_create(family, type, protocol, &sock2);
1438	if (err < 0)
1439	goto out_release_1;
1440
1441	err = sock1->ops->socketpair(sock1, sock2);
1442	if (err < 0)
1443	goto out_release_both;
1444
1445	fd1 = get_unused_fd_flags(flags);
1446	if (unlikely(fd1 < 0)) {
1447	err = fd1;
1448	goto out_release_both;
1449	}
1450
1451	fd2 = get_unused_fd_flags(flags);
1452	if (unlikely(fd2 < 0)) {
1453	err = fd2;
1454	goto out_put_unused_1;
1455	}
1456
1457	newfile1 = sock_alloc_file(sock1, flags, NULL);
1458	if (unlikely(IS_ERR(newfile1))) {
1459	err = PTR_ERR(newfile1);
1460	goto out_put_unused_both;
1461	}
1462
1463	newfile2 = sock_alloc_file(sock2, flags, NULL);
1464	if (IS_ERR(newfile2)) {
1465	err = PTR_ERR(newfile2);
1466	goto out_fput_1;
1467	}
1468
1469	err = put_user(fd1, &usockvec[0]);
1470	if (err)
1471	goto out_fput_both;
1472
1473	err = put_user(fd2, &usockvec[1]);
1474	if (err)
1475	goto out_fput_both;
1476
1477	audit_fd_pair(fd1, fd2);
1478
1479	fd_install(fd1, newfile1);
1480	fd_install(fd2, newfile2);
1481	/* fd1 and fd2 may be already another descriptors.
1482	* Not kernel problem.
1483	*/
1484
1485	return 0;
1486
1487	out_fput_both:
1488	fput(newfile2);
1489	fput(newfile1);
1490	put_unused_fd(fd2);
1491	put_unused_fd(fd1);
1492	goto out;
1493
1494	out_fput_1:
1495	fput(newfile1);
1496	put_unused_fd(fd2);
1497	put_unused_fd(fd1);
1498	sock_release(sock2);
1499	goto out;
1500
1501	out_put_unused_both:
1502	put_unused_fd(fd2);
1503	out_put_unused_1:
1504	put_unused_fd(fd1);
1505	out_release_both:
1506	sock_release(sock2);
1507	out_release_1:
1508	sock_release(sock1);
1509	out:
1510	return err;
1511	}
1512
1513	/*
1514	* Bind a name to a socket. Nothing much to do here since it's
1515	* the protocol's responsibility to handle the local address.
1516	*
1517	* We move the socket address to kernel space before we call
1518	* the protocol layer (having also checked the address is ok).
1519	*/
1520
1521	SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1522	{
1523	struct socket *sock;
1524	struct sockaddr_storage address;
1525	int err, fput_needed;
1526
1527	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1528	if (sock) {
1529	err = move_addr_to_kernel(umyaddr, addrlen, &address);
1530	if (err >= 0) {
1531	err = security_socket_bind(sock,
1532	(struct sockaddr *)&address,
1533	addrlen);
1534	if (!err)
1535	err = sock->ops->bind(sock,
1536	(struct sockaddr *)
1537	&address, addrlen);
1538	}
1539	fput_light(sock->file, fput_needed);
1540	}
1541	return err;
1542	}
1543
1544	/*
1545	* Perform a listen. Basically, we allow the protocol to do anything
1546	* necessary for a listen, and if that works, we mark the socket as
1547	* ready for listening.
1548	*/
1549
1550	SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1551	{
1552	struct socket *sock;
1553	int err, fput_needed;
1554	int somaxconn;
1555
1556	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1557	if (sock) {
1558	somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1559	if ((unsigned int)backlog > somaxconn)
1560	backlog = somaxconn;
1561
1562	err = security_socket_listen(sock, backlog);
1563	if (!err)
1564	err = sock->ops->listen(sock, backlog);
1565
1566	fput_light(sock->file, fput_needed);
1567	}
1568	return err;
1569	}
1570
1571	/*
1572	* For accept, we attempt to create a new socket, set up the link
1573	* with the client, wake up the client, then return the new
1574	* connected fd. We collect the address of the connector in kernel
1575	* space and move it to user at the very end. This is unclean because
1576	* we open the socket then return an error.
1577	*
1578	* 1003.1g adds the ability to recvmsg() to query connection pending
1579	* status to recvmsg. We need to add that support in a way thats
1580	* clean when we restucture accept also.
1581	*/
1582
1583	SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1584	int __user *, upeer_addrlen, int, flags)
1585	{
1586	struct socket sock, newsock;
1587	struct file *newfile;
1588	int err, len, newfd, fput_needed;
1589	struct sockaddr_storage address;
1590
1591	if (flags & ~(SOCK_CLOEXEC \| SOCK_NONBLOCK))
1592	return -EINVAL;
1593
1594	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1595	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1596
1597	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1598	if (!sock)
1599	goto out;
1600
1601	err = -ENFILE;
1602	newsock = sock_alloc();
1603	if (!newsock)
1604	goto out_put;
1605
1606	newsock->type = sock->type;
1607	newsock->ops = sock->ops;
1608
1609	/*
1610	* We don't need try_module_get here, as the listening socket (sock)
1611	* has the protocol module (sock->ops->owner) held.
1612	*/
1613	__module_get(newsock->ops->owner);
1614
1615	newfd = get_unused_fd_flags(flags);
1616	if (unlikely(newfd < 0)) {
1617	err = newfd;
1618	sock_release(newsock);
1619	goto out_put;
1620	}
1621	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1622	if (unlikely(IS_ERR(newfile))) {
1623	err = PTR_ERR(newfile);
1624	put_unused_fd(newfd);
1625	sock_release(newsock);
1626	goto out_put;
1627	}
1628
1629	err = security_socket_accept(sock, newsock);
1630	if (err)
1631	goto out_fd;
1632
1633	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1634	if (err < 0)
1635	goto out_fd;
1636
1637	if (upeer_sockaddr) {
1638	if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1639	&len, 2) < 0) {
1640	err = -ECONNABORTED;
1641	goto out_fd;
1642	}
1643	err = move_addr_to_user(&address,
1644	len, upeer_sockaddr, upeer_addrlen);
1645	if (err < 0)
1646	goto out_fd;
1647	}
1648
1649	/* File flags are not inherited via accept() unlike another OSes. */
1650
1651	fd_install(newfd, newfile);
1652	err = newfd;
1653
1654	out_put:
1655	fput_light(sock->file, fput_needed);
1656	out:
1657	return err;
1658	out_fd:
1659	fput(newfile);
1660	put_unused_fd(newfd);
1661	goto out_put;
1662	}
1663
1664	SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1665	int __user *, upeer_addrlen)
1666	{
1667	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1668	}
1669
1670	/*
1671	* Attempt to connect to a socket with the server address. The address
1672	* is in user space so we verify it is OK and move it to kernel space.
1673	*
1674	* For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1675	* break bindings
1676	*
1677	* NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1678	* other SEQPACKET protocols that take time to connect() as it doesn't
1679	* include the -EINPROGRESS status for such sockets.
1680	*/
1681
1682	SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1683	int, addrlen)
1684	{
1685	struct socket *sock;
1686	struct sockaddr_storage address;
1687	int err, fput_needed;
1688
1689	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1690	if (!sock)
1691	goto out;
1692	err = move_addr_to_kernel(uservaddr, addrlen, &address);
1693	if (err < 0)
1694	goto out_put;
1695
1696	err =
1697	security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1698	if (err)
1699	goto out_put;
1700
1701	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1702	sock->file->f_flags);
1703	out_put:
1704	fput_light(sock->file, fput_needed);
1705	out:
1706	return err;
1707	}
1708
1709	/*
1710	* Get the local address ('name') of a socket object. Move the obtained
1711	* name to user space.
1712	*/
1713
1714	SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1715	int __user *, usockaddr_len)
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);
1722	if (!sock)
1723	goto out;
1724
1725	err = security_socket_getsockname(sock);
1726	if (err)
1727	goto out_put;
1728
1729	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1730	if (err)
1731	goto out_put;
1732	err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1733
1734	out_put:
1735	fput_light(sock->file, fput_needed);
1736	out:
1737	return err;
1738	}
1739
1740	/*
1741	* Get the remote address ('name') of a socket object. Move the obtained
1742	* name to user space.
1743	*/
1744
1745	SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1746	int __user *, usockaddr_len)
1747	{
1748	struct socket *sock;
1749	struct sockaddr_storage address;
1750	int len, err, fput_needed;
1751
1752	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1753	if (sock != NULL) {
1754	err = security_socket_getpeername(sock);
1755	if (err) {
1756	fput_light(sock->file, fput_needed);
1757	return err;
1758	}
1759
1760	err =
1761	sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1762	1);
1763	if (!err)
1764	err = move_addr_to_user(&address, len, usockaddr,
1765	usockaddr_len);
1766	fput_light(sock->file, fput_needed);
1767	}
1768	return err;
1769	}
1770
1771	/*
1772	* Send a datagram to a given address. We move the address into kernel
1773	* space and check the user space data area is readable before invoking
1774	* the protocol.
1775	*/
1776
1777	SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1778	unsigned int, flags, struct sockaddr __user *, addr,
1779	int, addr_len)
1780	{
1781	struct socket *sock;
1782	struct sockaddr_storage address;
1783	int err;
1784	struct msghdr msg;
1785	struct iovec iov;
1786	int fput_needed;
1787
1788	if (len > INT_MAX)
1789	len = INT_MAX;
1790	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1791	if (!sock)
1792	goto out;
1793
1794	iov.iov_base = buff;
1795	iov.iov_len = len;
1796	msg.msg_name = NULL;
1797	msg.msg_iov = &iov;
1798	msg.msg_iovlen = 1;
1799	msg.msg_control = NULL;
1800	msg.msg_controllen = 0;
1801	msg.msg_namelen = 0;
1802	if (addr) {
1803	err = move_addr_to_kernel(addr, addr_len, &address);
1804	if (err < 0)
1805	goto out_put;
1806	msg.msg_name = (struct sockaddr *)&address;
1807	msg.msg_namelen = addr_len;
1808	}
1809	if (sock->file->f_flags & O_NONBLOCK)
1810	flags \|= MSG_DONTWAIT;
1811	msg.msg_flags = flags;
1812	err = sock_sendmsg(sock, &msg, len);
1813
1814	out_put:
1815	fput_light(sock->file, fput_needed);
1816	out:
1817	return err;
1818	}
1819
1820	/*
1821	* Send a datagram down a socket.
1822	*/
1823
1824	SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1825	unsigned int, flags)
1826	{
1827	return sys_sendto(fd, buff, len, flags, NULL, 0);
1828	}
1829
1830	/*
1831	* Receive a frame from the socket and optionally record the address of the
1832	* sender. We verify the buffers are writable and if needed move the
1833	* sender address from kernel to user space.
1834	*/
1835
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)
1839	{
1840	struct socket *sock;
1841	struct iovec iov;
1842	struct msghdr msg;
1843	struct sockaddr_storage address;
1844	int err, err2;
1845	int fput_needed;
1846
1847	if (size > INT_MAX)
1848	size = INT_MAX;
1849	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1850	if (!sock)
1851	goto out;
1852
1853	msg.msg_control = NULL;
1854	msg.msg_controllen = 0;
1855	msg.msg_iovlen = 1;
1856	msg.msg_iov = &iov;
1857	iov.iov_len = size;
1858	iov.iov_base = ubuf;
1859	/* Save some cycles and don't copy the address if not needed */
1860	msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1861	/* We assume all kernel code knows the size of sockaddr_storage */
1862	msg.msg_namelen = 0;
1863	if (sock->file->f_flags & O_NONBLOCK)
1864	flags \|= MSG_DONTWAIT;
1865	err = sock_recvmsg(sock, &msg, size, flags);
1866
1867	if (err >= 0 && addr != NULL) {
1868	err2 = move_addr_to_user(&address,
1869	msg.msg_namelen, addr, addr_len);
1870	if (err2 < 0)
1871	err = err2;
1872	}
1873
1874	fput_light(sock->file, fput_needed);
1875	out:
1876	return err;
1877	}
1878
1879	/*
1880	* Receive a datagram from a socket.
1881	*/
1882
1883	SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1884	unsigned int, flags)
1885	{
1886	return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1887	}
1888
1889	/*
1890	* Set a socket option. Because we don't know the option lengths we have
1891	* to pass the user mode parameter for the protocols to sort out.
1892	*/
1893
1894	SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1895	char __user *, optval, int, optlen)
1896	{
1897	int err, fput_needed;
1898	struct socket *sock;
1899
1900	if (optlen < 0)
1901	return -EINVAL;
1902
1903	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1904	if (sock != NULL) {
1905	err = security_socket_setsockopt(sock, level, optname);
1906	if (err)
1907	goto out_put;
1908
1909	if (level == SOL_SOCKET)
1910	err =
1911	sock_setsockopt(sock, level, optname, optval,
1912	optlen);
1913	else
1914	err =
1915	sock->ops->setsockopt(sock, level, optname, optval,
1916	optlen);
1917	out_put:
1918	fput_light(sock->file, fput_needed);
1919	}
1920	return err;
1921	}
1922
1923	/*
1924	* Get a socket option. Because we don't know the option lengths we have
1925	* to pass a user mode parameter for the protocols to sort out.
1926	*/
1927
1928	SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1929	char __user , optval, int __user , optlen)
1930	{
1931	int err, fput_needed;
1932	struct socket *sock;
1933
1934	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1935	if (sock != NULL) {
1936	err = security_socket_getsockopt(sock, level, optname);
1937	if (err)
1938	goto out_put;
1939
1940	if (level == SOL_SOCKET)
1941	err =
1942	sock_getsockopt(sock, level, optname, optval,
1943	optlen);
1944	else
1945	err =
1946	sock->ops->getsockopt(sock, level, optname, optval,
1947	optlen);
1948	out_put:
1949	fput_light(sock->file, fput_needed);
1950	}
1951	return err;
1952	}
1953
1954	/*
1955	* Shutdown a socket.
1956	*/
1957
1958	SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1959	{
1960	int err, fput_needed;
1961	struct socket *sock;
1962
1963	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1964	if (sock != NULL) {
1965	err = security_socket_shutdown(sock, how);
1966	if (!err)
1967	err = sock->ops->shutdown(sock, how);
1968	fput_light(sock->file, fput_needed);
1969	}
1970	return err;
1971	}
1972
1973	/* A couple of helpful macros for getting the address of the 32/64 bit
1974	* fields which are the same type (int / unsigned) on our platforms.
1975	*/
1976	#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1977	#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1978	#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1979
1980	struct used_address {
1981	struct sockaddr_storage name;
1982	unsigned int name_len;
1983	};
1984
1985	static int copy_msghdr_from_user(struct msghdr *kmsg,
1986	struct msghdr __user *umsg)
1987	{
1988	if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
1989	return -EFAULT;
1990
1991	if (kmsg->msg_namelen < 0)
1992	return -EINVAL;
1993
1994	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1995	kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1996	return 0;
1997	}
1998
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)
2002	{
2003	struct compat_msghdr __user *msg_compat =
2004	(struct compat_msghdr __user *)msg;
2005	struct sockaddr_storage address;
2006	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2007	unsigned char ctl[sizeof(struct cmsghdr) + 20]
2008	__attribute__ ((aligned(sizeof(__kernel_size_t))));
2009	/* 20 is size of ipv6_pktinfo */
2010	unsigned char *ctl_buf = ctl;
2011	int err, ctl_len, total_len;
2012
2013	err = -EFAULT;
2014	if (MSG_CMSG_COMPAT & flags) {
2015	if (get_compat_msghdr(msg_sys, msg_compat))
2016	return -EFAULT;
2017	} else {
2018	err = copy_msghdr_from_user(msg_sys, msg);
2019	if (err)
2020	return err;
2021	}
2022
2023	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2024	err = -EMSGSIZE;
2025	if (msg_sys->msg_iovlen > UIO_MAXIOV)
2026	goto out;
2027	err = -ENOMEM;
2028	iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2029	GFP_KERNEL);
2030	if (!iov)
2031	goto out;
2032	}
2033
2034	/* This will also move the address data into kernel space */
2035	if (MSG_CMSG_COMPAT & flags) {
2036	err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
2037	} else
2038	err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2039	if (err < 0)
2040	goto out_freeiov;
2041	total_len = err;
2042
2043	err = -ENOBUFS;
2044
2045	if (msg_sys->msg_controllen > INT_MAX)
2046	goto out_freeiov;
2047	ctl_len = msg_sys->msg_controllen;
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));
2052	if (err)
2053	goto out_freeiov;
2054	ctl_buf = msg_sys->msg_control;
2055	ctl_len = msg_sys->msg_controllen;
2056	} else if (ctl_len) {
2057	if (ctl_len > sizeof(ctl)) {
2058	ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2059	if (ctl_buf == NULL)
2060	goto out_freeiov;
2061	}
2062	err = -EFAULT;
2063	/*
2064	* Careful! Before this, msg_sys->msg_control contains a user pointer.
2065	* Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2066	* checking falls down on this.
2067	*/
2068	if (copy_from_user(ctl_buf,
2069	(void __user __force *)msg_sys->msg_control,
2070	ctl_len))
2071	goto out_freectl;
2072	msg_sys->msg_control = ctl_buf;
2073	}
2074	msg_sys->msg_flags = flags;
2075
2076	if (sock->file->f_flags & O_NONBLOCK)
2077	msg_sys->msg_flags \|= MSG_DONTWAIT;
2078	/*
2079	* If this is sendmmsg() and current destination address is same as
2080	* previously succeeded address, omit asking LSM's decision.
2081	* used_address->name_len is initialized to UINT_MAX so that the first
2082	* destination address never matches.
2083	*/
2084	if (used_address && msg_sys->msg_name &&
2085	used_address->name_len == msg_sys->msg_namelen &&
2086	!memcmp(&used_address->name, msg_sys->msg_name,
2087	used_address->name_len)) {
2088	err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2089	goto out_freectl;
2090	}
2091	err = sock_sendmsg(sock, msg_sys, total_len);
2092	/*
2093	* If this is sendmmsg() and sending to current destination address was
2094	* successful, remember it.
2095	*/
2096	if (used_address && err >= 0) {
2097	used_address->name_len = msg_sys->msg_namelen;
2098	if (msg_sys->msg_name)
2099	memcpy(&used_address->name, msg_sys->msg_name,
2100	used_address->name_len);
2101	}
2102
2103	out_freectl:
2104	if (ctl_buf != ctl)
2105	sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2106	out_freeiov:
2107	if (iov != iovstack)
2108	kfree(iov);
2109	out:
2110	return err;
2111	}
2112
2113	/*
2114	* BSD sendmsg interface
2115	*/
2116
2117	long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
2118	{
2119	int fput_needed, err;
2120	struct msghdr msg_sys;
2121	struct socket *sock;
2122
2123	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2124	if (!sock)
2125	goto out;
2126
2127	err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2128
2129	fput_light(sock->file, fput_needed);
2130	out:
2131	return err;
2132	}
2133
2134	SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2135	{
2136	if (flags & MSG_CMSG_COMPAT)
2137	return -EINVAL;
2138	return __sys_sendmsg(fd, msg, flags);
2139	}
2140
2141	/*
2142	* Linux sendmmsg interface
2143	*/
2144
2145	int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2146	unsigned int flags)
2147	{
2148	int fput_needed, err, datagrams;
2149	struct socket *sock;
2150	struct mmsghdr __user *entry;
2151	struct compat_mmsghdr __user *compat_entry;
2152	struct msghdr msg_sys;
2153	struct used_address used_address;
2154
2155	if (vlen > UIO_MAXIOV)
2156	vlen = UIO_MAXIOV;
2157
2158	datagrams = 0;
2159
2160	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2161	if (!sock)
2162	return err;
2163
2164	used_address.name_len = UINT_MAX;
2165	entry = mmsg;
2166	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2167	err = 0;
2168
2169	while (datagrams < vlen) {
2170	if (MSG_CMSG_COMPAT & flags) {
2171	err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2172	&msg_sys, flags, &used_address);
2173	if (err < 0)
2174	break;
2175	err = __put_user(err, &compat_entry->msg_len);
2176	++compat_entry;
2177	} else {
2178	err = ___sys_sendmsg(sock,
2179	(struct msghdr __user *)entry,
2180	&msg_sys, flags, &used_address);
2181	if (err < 0)
2182	break;
2183	err = put_user(err, &entry->msg_len);
2184	++entry;
2185	}
2186
2187	if (err)
2188	break;
2189	++datagrams;
2190	}
2191
2192	fput_light(sock->file, fput_needed);
2193
2194	/* We only return an error if no datagrams were able to be sent */
2195	if (datagrams != 0)
2196	return datagrams;
2197
2198	return err;
2199	}
2200
2201	SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2202	unsigned int, vlen, unsigned int, flags)
2203	{
2204	if (flags & MSG_CMSG_COMPAT)
2205	return -EINVAL;
2206	return __sys_sendmmsg(fd, mmsg, vlen, flags);
2207	}
2208
2209	static int ___sys_recvmsg(struct socket sock, struct msghdr __user msg,
2210	struct msghdr *msg_sys, unsigned int flags, int nosec)
2211	{
2212	struct compat_msghdr __user *msg_compat =
2213	(struct compat_msghdr __user *)msg;
2214	struct iovec iovstack[UIO_FASTIOV];
2215	struct iovec *iov = iovstack;
2216	unsigned long cmsg_ptr;
2217	int err, total_len, len;
2218
2219	/* kernel mode address */
2220	struct sockaddr_storage addr;
2221
2222	/* user mode address pointers */
2223	struct sockaddr __user *uaddr;
2224	int __user *uaddr_len;
2225
2226	if (MSG_CMSG_COMPAT & flags) {
2227	if (get_compat_msghdr(msg_sys, msg_compat))
2228	return -EFAULT;
2229	} else {
2230	err = copy_msghdr_from_user(msg_sys, msg);
2231	if (err)
2232	return err;
2233	}
2234
2235	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2236	err = -EMSGSIZE;
2237	if (msg_sys->msg_iovlen > UIO_MAXIOV)
2238	goto out;
2239	err = -ENOMEM;
2240	iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2241	GFP_KERNEL);
2242	if (!iov)
2243	goto out;
2244	}
2245
2246	/* Save the user-mode address (verify_iovec will change the
2247	* kernel msghdr to use the kernel address space)
2248	*/
2249	uaddr = (__force void __user *)msg_sys->msg_name;
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);
2255	if (err < 0)
2256	goto out_freeiov;
2257	total_len = err;
2258
2259	cmsg_ptr = (unsigned long)msg_sys->msg_control;
2260	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC\|MSG_CMSG_COMPAT);
2261
2262	/* We assume all kernel code knows the size of sockaddr_storage */
2263	msg_sys->msg_namelen = 0;
2264
2265	if (sock->file->f_flags & O_NONBLOCK)
2266	flags \|= MSG_DONTWAIT;
2267	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2268	total_len, flags);
2269	if (err < 0)
2270	goto out_freeiov;
2271	len = err;
2272
2273	if (uaddr != NULL) {
2274	err = move_addr_to_user(&addr,
2275	msg_sys->msg_namelen, uaddr,
2276	uaddr_len);
2277	if (err < 0)
2278	goto out_freeiov;
2279	}
2280	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2281	COMPAT_FLAGS(msg));
2282	if (err)
2283	goto out_freeiov;
2284	if (MSG_CMSG_COMPAT & flags)
2285	err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2286	&msg_compat->msg_controllen);
2287	else
2288	err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2289	&msg->msg_controllen);
2290	if (err)
2291	goto out_freeiov;
2292	err = len;
2293
2294	out_freeiov:
2295	if (iov != iovstack)
2296	kfree(iov);
2297	out:
2298	return err;
2299	}
2300
2301	/*
2302	* BSD recvmsg interface
2303	*/
2304
2305	long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
2306	{
2307	int fput_needed, err;
2308	struct msghdr msg_sys;
2309	struct socket *sock;
2310
2311	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2312	if (!sock)
2313	goto out;
2314
2315	err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2316
2317	fput_light(sock->file, fput_needed);
2318	out:
2319	return err;
2320	}
2321
2322	SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2323	unsigned int, flags)
2324	{
2325	if (flags & MSG_CMSG_COMPAT)
2326	return -EINVAL;
2327	return __sys_recvmsg(fd, msg, flags);
2328	}
2329
2330	/*
2331	* Linux recvmmsg interface
2332	*/
2333
2334	int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2335	unsigned int flags, struct timespec *timeout)
2336	{
2337	int fput_needed, err, datagrams;
2338	struct socket *sock;
2339	struct mmsghdr __user *entry;
2340	struct compat_mmsghdr __user *compat_entry;
2341	struct msghdr msg_sys;
2342	struct timespec end_time;
2343
2344	if (timeout &&
2345	poll_select_set_timeout(&end_time, timeout->tv_sec,
2346	timeout->tv_nsec))
2347	return -EINVAL;
2348
2349	datagrams = 0;
2350
2351	sock = sockfd_lookup_light(fd, &err, &fput_needed);
2352	if (!sock)
2353	return err;
2354
2355	err = sock_error(sock->sk);
2356	if (err)
2357	goto out_put;
2358
2359	entry = mmsg;
2360	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2361
2362	while (datagrams < vlen) {
2363	/*
2364	* No need to ask LSM for more than the first datagram.
2365	*/
2366	if (MSG_CMSG_COMPAT & flags) {
2367	err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2368	&msg_sys, flags & ~MSG_WAITFORONE,
2369	datagrams);
2370	if (err < 0)
2371	break;
2372	err = __put_user(err, &compat_entry->msg_len);
2373	++compat_entry;
2374	} else {
2375	err = ___sys_recvmsg(sock,
2376	(struct msghdr __user *)entry,
2377	&msg_sys, flags & ~MSG_WAITFORONE,
2378	datagrams);
2379	if (err < 0)
2380	break;
2381	err = put_user(err, &entry->msg_len);
2382	++entry;
2383	}
2384
2385	if (err)
2386	break;
2387	++datagrams;
2388
2389	/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2390	if (flags & MSG_WAITFORONE)
2391	flags \|= MSG_DONTWAIT;
2392
2393	if (timeout) {
2394	ktime_get_ts(timeout);
2395	timeout = timespec_sub(end_time, timeout);
2396	if (timeout->tv_sec < 0) {
2397	timeout->tv_sec = timeout->tv_nsec = 0;
2398	break;
2399	}
2400
2401	/* Timeout, return less than vlen datagrams */
2402	if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2403	break;
2404	}
2405
2406	/* Out of band data, return right away */
2407	if (msg_sys.msg_flags & MSG_OOB)
2408	break;
2409	}
2410
2411	out_put:
2412	fput_light(sock->file, fput_needed);
2413
2414	if (err == 0)
2415	return datagrams;
2416
2417	if (datagrams != 0) {
2418	/*
2419	* We may return less entries than requested (vlen) if the
2420	* sock is non block and there aren't enough datagrams...
2421	*/
2422	if (err != -EAGAIN) {
2423	/*
2424	* ... or if recvmsg returns an error after we
2425	* received some datagrams, where we record the
2426	* error to return on the next call or if the
2427	* app asks about it using getsockopt(SO_ERROR).
2428	*/
2429	sock->sk->sk_err = -err;
2430	}
2431
2432	return datagrams;
2433	}
2434
2435	return err;
2436	}
2437
2438	SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2439	unsigned int, vlen, unsigned int, flags,
2440	struct timespec __user *, timeout)
2441	{
2442	int datagrams;
2443	struct timespec timeout_sys;
2444
2445	if (flags & MSG_CMSG_COMPAT)
2446	return -EINVAL;
2447
2448	if (!timeout)
2449	return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2450
2451	if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2452	return -EFAULT;
2453
2454	datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2455
2456	if (datagrams > 0 &&
2457	copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2458	datagrams = -EFAULT;
2459
2460	return datagrams;
2461	}
2462
2463	#ifdef __ARCH_WANT_SYS_SOCKETCALL
2464	/* Argument list sizes for sys_socketcall */
2465	#define AL(x) ((x) * sizeof(unsigned long))
2466	static const unsigned char nargs[21] = {
2467	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2468	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2469	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2470	AL(4), AL(5), AL(4)
2471	};
2472
2473	#undef AL
2474
2475	/*
2476	* System call vectors.
2477	*
2478	* Argument checking cleaned up. Saved 20% in size.
2479	* This function doesn't need to set the kernel lock because
2480	* it is set by the callees.
2481	*/
2482
2483	SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2484	{
2485	unsigned long a[AUDITSC_ARGS];
2486	unsigned long a0, a1;
2487	int err;
2488	unsigned int len;
2489
2490	if (call < 1 \|\| call > SYS_SENDMMSG)
2491	return -EINVAL;
2492
2493	len = nargs[call];
2494	if (len > sizeof(a))
2495	return -EINVAL;
2496
2497	/* copy_from_user should be SMP safe. */
2498	if (copy_from_user(a, args, len))
2499	return -EFAULT;
2500
2501	err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2502	if (err)
2503	return err;
2504
2505	a0 = a[0];
2506	a1 = a[1];
2507
2508	switch (call) {
2509	case SYS_SOCKET:
2510	err = sys_socket(a0, a1, a[2]);
2511	break;
2512	case SYS_BIND:
2513	err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2514	break;
2515	case SYS_CONNECT:
2516	err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2517	break;
2518	case SYS_LISTEN:
2519	err = sys_listen(a0, a1);
2520	break;
2521	case SYS_ACCEPT:
2522	err = sys_accept4(a0, (struct sockaddr __user *)a1,
2523	(int __user *)a[2], 0);
2524	break;
2525	case SYS_GETSOCKNAME:
2526	err =
2527	sys_getsockname(a0, (struct sockaddr __user *)a1,
2528	(int __user *)a[2]);
2529	break;
2530	case SYS_GETPEERNAME:
2531	err =
2532	sys_getpeername(a0, (struct sockaddr __user *)a1,
2533	(int __user *)a[2]);
2534	break;
2535	case SYS_SOCKETPAIR:
2536	err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2537	break;
2538	case SYS_SEND:
2539	err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2540	break;
2541	case SYS_SENDTO:
2542	err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2543	(struct sockaddr __user *)a[4], a[5]);
2544	break;
2545	case SYS_RECV:
2546	err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2547	break;
2548	case SYS_RECVFROM:
2549	err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2550	(struct sockaddr __user *)a[4],
2551	(int __user *)a[5]);
2552	break;
2553	case SYS_SHUTDOWN:
2554	err = sys_shutdown(a0, a1);
2555	break;
2556	case SYS_SETSOCKOPT:
2557	err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2558	break;
2559	case SYS_GETSOCKOPT:
2560	err =
2561	sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2562	(int __user *)a[4]);
2563	break;
2564	case SYS_SENDMSG:
2565	err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2566	break;
2567	case SYS_SENDMMSG:
2568	err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2569	break;
2570	case SYS_RECVMSG:
2571	err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2572	break;
2573	case SYS_RECVMMSG:
2574	err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2575	(struct timespec __user *)a[4]);
2576	break;
2577	case SYS_ACCEPT4:
2578	err = sys_accept4(a0, (struct sockaddr __user *)a1,
2579	(int __user *)a[2], a[3]);
2580	break;
2581	default:
2582	err = -EINVAL;
2583	break;
2584	}
2585	return err;
2586	}
2587
2588	#endif /* __ARCH_WANT_SYS_SOCKETCALL */
2589
2590	/**
2591	* sock_register - add a socket protocol handler
2592	* @ops: description of protocol
2593	*
2594	* This function is called by a protocol handler that wants to
2595	* advertise its address family, and have it linked into the
2596	* socket interface. The value ops->family coresponds to the
2597	* socket system call protocol family.
2598	*/
2599	int sock_register(const struct net_proto_family *ops)
2600	{
2601	int err;
2602
2603	if (ops->family >= NPROTO) {
2604	pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
2605	return -ENOBUFS;
2606	}
2607
2608	spin_lock(&net_family_lock);
2609	if (rcu_dereference_protected(net_families[ops->family],
2610	lockdep_is_held(&net_family_lock)))
2611	err = -EEXIST;
2612	else {
2613	rcu_assign_pointer(net_families[ops->family], ops);
2614	err = 0;
2615	}
2616	spin_unlock(&net_family_lock);
2617
2618	pr_info("NET: Registered protocol family %d\n", ops->family);
2619	return err;
2620	}
2621	EXPORT_SYMBOL(sock_register);
2622
2623	/**
2624	* sock_unregister - remove a protocol handler
2625	* @family: protocol family to remove
2626	*
2627	* This function is called by a protocol handler that wants to
2628	* remove its address family, and have it unlinked from the
2629	* new socket creation.
2630	*
2631	* If protocol handler is a module, then it can use module reference
2632	* counts to protect against new references. If protocol handler is not
2633	* a module then it needs to provide its own protection in
2634	* the ops->create routine.
2635	*/
2636	void sock_unregister(int family)
2637	{
2638	BUG_ON(family < 0 \|\| family >= NPROTO);
2639
2640	spin_lock(&net_family_lock);
2641	RCU_INIT_POINTER(net_families[family], NULL);
2642	spin_unlock(&net_family_lock);
2643
2644	synchronize_rcu();
2645
2646	pr_info("NET: Unregistered protocol family %d\n", family);
2647	}
2648	EXPORT_SYMBOL(sock_unregister);
2649
2650	static int __init sock_init(void)
2651	{
2652	int err;
2653	/*
2654	* Initialize the network sysctl infrastructure.
2655	*/
2656	err = net_sysctl_init();
2657	if (err)
2658	goto out;
2659
2660	/*
2661	* Initialize skbuff SLAB cache
2662	*/
2663	skb_init();
2664
2665	/*
2666	* Initialize the protocols module.
2667	*/
2668
2669	init_inodecache();
2670
2671	err = register_filesystem(&sock_fs_type);
2672	if (err)
2673	goto out_fs;
2674	sock_mnt = kern_mount(&sock_fs_type);
2675	if (IS_ERR(sock_mnt)) {
2676	err = PTR_ERR(sock_mnt);
2677	goto out_mount;
2678	}
2679
2680	/* The real protocol initialization is performed in later initcalls.
2681	*/
2682
2683	#ifdef CONFIG_NETFILTER
2684	err = netfilter_init();
2685	if (err)
2686	goto out;
2687	#endif
2688
2689	ptp_classifier_init();
2690
2691	out:
2692	return err;
2693
2694	out_mount:
2695	unregister_filesystem(&sock_fs_type);
2696	out_fs:
2697	goto out;
2698	}
2699
2700	core_initcall(sock_init); /* early initcall */
2701
2702	#ifdef CONFIG_PROC_FS
2703	void socket_seq_show(struct seq_file *seq)
2704	{
2705	int cpu;
2706	int counter = 0;
2707
2708	for_each_possible_cpu(cpu)
2709	counter += per_cpu(sockets_in_use, cpu);
2710
2711	/* It can be negative, by the way. 8) */
2712	if (counter < 0)
2713	counter = 0;
2714
2715	seq_printf(seq, "sockets: used %d\n", counter);
2716	}
2717	#endif /* CONFIG_PROC_FS */
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	mm_segment_t old_fs = get_fs();
2724	struct timeval ktv;
2725	int err;
2726
2727	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	return err;
2734	}
2735
2736	static int do_siocgstampns(struct net net, struct socket sock,
2737	unsigned int cmd, void __user *up)
2738	{
2739	mm_segment_t old_fs = get_fs();
2740	struct timespec kts;
2741	int err;
2742
2743	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	return err;
2750	}
2751
2752	static int dev_ifname32(struct net net, struct compat_ifreq __user uifr32)
2753	{
2754	struct ifreq __user *uifr;
2755	int err;
2756
2757	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2758	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2759	return -EFAULT;
2760
2761	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2762	if (err)
2763	return err;
2764
2765	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2766	return -EFAULT;
2767
2768	return 0;
2769	}
2770
2771	static int dev_ifconf(struct net net, struct compat_ifconf __user uifc32)
2772	{
2773	struct compat_ifconf ifc32;
2774	struct ifconf ifc;
2775	struct ifconf __user *uifc;
2776	struct compat_ifreq __user *ifr32;
2777	struct ifreq __user *ifr;
2778	unsigned int i, j;
2779	int err;
2780
2781	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2782	return -EFAULT;
2783
2784	memset(&ifc, 0, sizeof(ifc));
2785	if (ifc32.ifcbuf == 0) {
2786	ifc32.ifc_len = 0;
2787	ifc.ifc_len = 0;
2788	ifc.ifc_req = NULL;
2789	uifc = compat_alloc_user_space(sizeof(struct ifconf));
2790	} else {
2791	size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2792	sizeof(struct ifreq);
2793	uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2794	ifc.ifc_len = len;
2795	ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2796	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	return -EFAULT;
2800	ifr++;
2801	ifr32++;
2802	}
2803	}
2804	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2805	return -EFAULT;
2806
2807	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2808	if (err)
2809	return err;
2810
2811	if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2812	return -EFAULT;
2813
2814	ifr = ifc.ifc_req;
2815	ifr32 = compat_ptr(ifc32.ifcbuf);
2816	for (i = 0, j = 0;
2817	i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2818	i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2819	if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2820	return -EFAULT;
2821	ifr32++;
2822	ifr++;
2823	}
2824
2825	if (ifc32.ifcbuf == 0) {
2826	/* Translate from 64-bit structure multiple to
2827	* a 32-bit one.
2828	*/
2829	i = ifc.ifc_len;
2830	i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2831	ifc32.ifc_len = i;
2832	} else {
2833	ifc32.ifc_len = i;
2834	}
2835	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2836	return -EFAULT;
2837
2838	return 0;
2839	}
2840
2841	static int ethtool_ioctl(struct net net, struct compat_ifreq __user ifr32)
2842	{
2843	struct compat_ethtool_rxnfc __user *compat_rxnfc;
2844	bool convert_in = false, convert_out = false;
2845	size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2846	struct ethtool_rxnfc __user *rxnfc;
2847	struct ifreq __user *ifr;
2848	u32 rule_cnt = 0, actual_rule_cnt;
2849	u32 ethcmd;
2850	u32 data;
2851	int ret;
2852
2853	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2854	return -EFAULT;
2855
2856	compat_rxnfc = compat_ptr(data);
2857
2858	if (get_user(ethcmd, &compat_rxnfc->cmd))
2859	return -EFAULT;
2860
2861	/* Most ethtool structures are defined without padding.
2862	* Unfortunately struct ethtool_rxnfc is an exception.
2863	*/
2864	switch (ethcmd) {
2865	default:
2866	break;
2867	case ETHTOOL_GRXCLSRLALL:
2868	/* Buffer size is variable */
2869	if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2870	return -EFAULT;
2871	if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2872	return -ENOMEM;
2873	buf_size += rule_cnt * sizeof(u32);
2874	/* fall through */
2875	case ETHTOOL_GRXRINGS:
2876	case ETHTOOL_GRXCLSRLCNT:
2877	case ETHTOOL_GRXCLSRULE:
2878	case ETHTOOL_SRXCLSRLINS:
2879	convert_out = true;
2880	/* fall through */
2881	case ETHTOOL_SRXCLSRLDEL:
2882	buf_size += sizeof(struct ethtool_rxnfc);
2883	convert_in = true;
2884	break;
2885	}
2886
2887	ifr = compat_alloc_user_space(buf_size);
2888	rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2889
2890	if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2891	return -EFAULT;
2892
2893	if (put_user(convert_in ? rxnfc : compat_ptr(data),
2894	&ifr->ifr_ifru.ifru_data))
2895	return -EFAULT;
2896
2897	if (convert_in) {
2898	/* We expect there to be holes between fs.m_ext and
2899	* fs.ring_cookie and at the end of fs, but nowhere else.
2900	*/
2901	BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2902	sizeof(compat_rxnfc->fs.m_ext) !=
2903	offsetof(struct ethtool_rxnfc, fs.m_ext) +
2904	sizeof(rxnfc->fs.m_ext));
2905	BUILD_BUG_ON(
2906	offsetof(struct compat_ethtool_rxnfc, fs.location) -
2907	offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2908	offsetof(struct ethtool_rxnfc, fs.location) -
2909	offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2910
2911	if (copy_in_user(rxnfc, compat_rxnfc,
2912	(void __user *)(&rxnfc->fs.m_ext + 1) -
2913	(void __user *)rxnfc) \|\|
2914	copy_in_user(&rxnfc->fs.ring_cookie,
2915	&compat_rxnfc->fs.ring_cookie,
2916	(void __user *)(&rxnfc->fs.location + 1) -
2917	(void __user *)&rxnfc->fs.ring_cookie) \|\|
2918	copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2919	sizeof(rxnfc->rule_cnt)))
2920	return -EFAULT;
2921	}
2922
2923	ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2924	if (ret)
2925	return ret;
2926
2927	if (convert_out) {
2928	if (copy_in_user(compat_rxnfc, rxnfc,
2929	(const void __user *)(&rxnfc->fs.m_ext + 1) -
2930	(const void __user *)rxnfc) \|\|
2931	copy_in_user(&compat_rxnfc->fs.ring_cookie,
2932	&rxnfc->fs.ring_cookie,
2933	(const void __user *)(&rxnfc->fs.location + 1) -
2934	(const void __user *)&rxnfc->fs.ring_cookie) \|\|
2935	copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2936	sizeof(rxnfc->rule_cnt)))
2937	return -EFAULT;
2938
2939	if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2940	/* As an optimisation, we only copy the actual
2941	* number of rules that the underlying
2942	* function returned. Since Mallory might
2943	* change the rule count in user memory, we
2944	* check that it is less than the rule count
2945	* originally given (as the user buffer size),
2946	* which has been range-checked.
2947	*/
2948	if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2949	return -EFAULT;
2950	if (actual_rule_cnt < rule_cnt)
2951	rule_cnt = actual_rule_cnt;
2952	if (copy_in_user(&compat_rxnfc->rule_locs[0],
2953	&rxnfc->rule_locs[0],
2954	rule_cnt * sizeof(u32)))
2955	return -EFAULT;
2956	}
2957	}
2958
2959	return 0;
2960	}
2961
2962	static int compat_siocwandev(struct net net, struct compat_ifreq __user uifr32)
2963	{
2964	void __user *uptr;
2965	compat_uptr_t uptr32;
2966	struct ifreq __user *uifr;
2967
2968	uifr = compat_alloc_user_space(sizeof(*uifr));
2969	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2970	return -EFAULT;
2971
2972	if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2973	return -EFAULT;
2974
2975	uptr = compat_ptr(uptr32);
2976
2977	if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2978	return -EFAULT;
2979
2980	return dev_ioctl(net, SIOCWANDEV, uifr);
2981	}
2982
2983	static int bond_ioctl(struct net *net, unsigned int cmd,
2984	struct compat_ifreq __user *ifr32)
2985	{
2986	struct ifreq kifr;
2987	mm_segment_t old_fs;
2988	int err;
2989
2990	switch (cmd) {
2991	case SIOCBONDENSLAVE:
2992	case SIOCBONDRELEASE:
2993	case SIOCBONDSETHWADDR:
2994	case SIOCBONDCHANGEACTIVE:
2995	if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2996	return -EFAULT;
2997
2998	old_fs = get_fs();
2999	set_fs(KERNEL_DS);
3000	err = dev_ioctl(net, cmd,
3001	(struct ifreq __user __force *) &kifr);
3002	set_fs(old_fs);
3003
3004	return err;
3005	default:
3006	return -ENOIOCTLCMD;
3007	}
3008	}
3009
3010	/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3011	static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
3012	struct compat_ifreq __user *u_ifreq32)
3013	{
3014	struct ifreq __user *u_ifreq64;
3015	char tmp_buf[IFNAMSIZ];
3016	void __user *data64;
3017	u32 data32;
3018
3019	if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
3020	IFNAMSIZ))
3021	return -EFAULT;
3022	if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
3023	return -EFAULT;
3024	data64 = compat_ptr(data32);
3025
3026	u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
3027
3028	if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
3029	IFNAMSIZ))
3030	return -EFAULT;
3031	if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
3032	return -EFAULT;
3033
3034	return dev_ioctl(net, cmd, u_ifreq64);
3035	}
3036
3037	static int dev_ifsioc(struct net net, struct socket sock,
3038	unsigned int cmd, struct compat_ifreq __user *uifr32)
3039	{
3040	struct ifreq __user *uifr;
3041	int err;
3042
3043	uifr = compat_alloc_user_space(sizeof(*uifr));
3044	if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3045	return -EFAULT;
3046
3047	err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3048
3049	if (!err) {
3050	switch (cmd) {
3051	case SIOCGIFFLAGS:
3052	case SIOCGIFMETRIC:
3053	case SIOCGIFMTU:
3054	case SIOCGIFMEM:
3055	case SIOCGIFHWADDR:
3056	case SIOCGIFINDEX:
3057	case SIOCGIFADDR:
3058	case SIOCGIFBRDADDR:
3059	case SIOCGIFDSTADDR:
3060	case SIOCGIFNETMASK:
3061	case SIOCGIFPFLAGS:
3062	case SIOCGIFTXQLEN:
3063	case SIOCGMIIPHY:
3064	case SIOCGMIIREG:
3065	if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3066	err = -EFAULT;
3067	break;
3068	}
3069	}
3070	return err;
3071	}
3072
3073	static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3074	struct compat_ifreq __user *uifr32)
3075	{
3076	struct ifreq ifr;
3077	struct compat_ifmap __user *uifmap32;
3078	mm_segment_t old_fs;
3079	int err;
3080
3081	uifmap32 = &uifr32->ifr_ifru.ifru_map;
3082	err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
3083	err \|= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3084	err \|= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3085	err \|= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3086	err \|= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3087	err \|= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3088	err \|= get_user(ifr.ifr_map.port, &uifmap32->port);
3089	if (err)
3090	return -EFAULT;
3091
3092	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	if (cmd == SIOCGIFMAP && !err) {
3098	err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3099	err \|= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3100	err \|= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3101	err \|= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3102	err \|= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3103	err \|= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3104	err \|= put_user(ifr.ifr_map.port, &uifmap32->port);
3105	if (err)
3106	err = -EFAULT;
3107	}
3108	return err;
3109	}
3110
3111	struct rtentry32 {
3112	u32 rt_pad1;
3113	struct sockaddr rt_dst; /* target address */
3114	struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3115	struct sockaddr rt_genmask; /* target network mask (IP) */
3116	unsigned short rt_flags;
3117	short rt_pad2;
3118	u32 rt_pad3;
3119	unsigned char rt_tos;
3120	unsigned char rt_class;
3121	short rt_pad4;
3122	short rt_metric; /* +1 for binary compatibility! */
3123	/* char * / u32 rt_dev; / forcing the device at add */
3124	u32 rt_mtu; /* per route MTU/Window */
3125	u32 rt_window; /* Window clamping */
3126	unsigned short rt_irtt; /* Initial RTT */
3127	};
3128
3129	struct in6_rtmsg32 {
3130	struct in6_addr rtmsg_dst;
3131	struct in6_addr rtmsg_src;
3132	struct in6_addr rtmsg_gateway;
3133	u32 rtmsg_type;
3134	u16 rtmsg_dst_len;
3135	u16 rtmsg_src_len;
3136	u32 rtmsg_metric;
3137	u32 rtmsg_info;
3138	u32 rtmsg_flags;
3139	s32 rtmsg_ifindex;
3140	};
3141
3142	static int routing_ioctl(struct net net, struct socket sock,
3143	unsigned int cmd, void __user *argp)
3144	{
3145	int ret;
3146	void *r = NULL;
3147	struct in6_rtmsg r6;
3148	struct rtentry r4;
3149	char devname[16];
3150	u32 rtdev;
3151	mm_segment_t old_fs = get_fs();
3152
3153	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3154	struct in6_rtmsg32 __user *ur6 = argp;
3155	ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3156	3 * sizeof(struct in6_addr));
3157	ret \|= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3158	ret \|= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3159	ret \|= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3160	ret \|= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3161	ret \|= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3162	ret \|= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3163	ret \|= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3164
3165	r = (void *) &r6;
3166	} 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	ret \|= get_user(r4.rt_flags, &(ur4->rt_flags));
3171	ret \|= get_user(r4.rt_metric, &(ur4->rt_metric));
3172	ret \|= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3173	ret \|= get_user(r4.rt_window, &(ur4->rt_window));
3174	ret \|= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3175	ret \|= get_user(rtdev, &(ur4->rt_dev));
3176	if (rtdev) {
3177	ret \|= copy_from_user(devname, compat_ptr(rtdev), 15);
3178	r4.rt_dev = (char __user __force *)devname;
3179	devname[15] = 0;
3180	} else
3181	r4.rt_dev = NULL;
3182
3183	r = (void *) &r4;
3184	}
3185
3186	if (ret) {
3187	ret = -EFAULT;
3188	goto out;
3189	}
3190
3191	set_fs(KERNEL_DS);
3192	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3193	set_fs(old_fs);
3194
3195	out:
3196	return ret;
3197	}
3198
3199	/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3200	* for some operations; this forces use of the newer bridge-utils that
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	return -EFAULT;
3209	if (tmp == BRCTL_GET_VERSION)
3210	return BRCTL_VERSION + 1;
3211	return -EINVAL;
3212	}
3213
3214	static int compat_sock_ioctl_trans(struct file file, struct socket sock,
3215	unsigned int cmd, unsigned long arg)
3216	{
3217	void __user *argp = compat_ptr(arg);
3218	struct sock *sk = sock->sk;
3219	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	switch (cmd) {
3225	case SIOCSIFBR:
3226	case SIOCGIFBR:
3227	return old_bridge_ioctl(argp);
3228	case SIOCGIFNAME:
3229	return dev_ifname32(net, argp);
3230	case SIOCGIFCONF:
3231	return dev_ifconf(net, argp);
3232	case SIOCETHTOOL:
3233	return ethtool_ioctl(net, argp);
3234	case SIOCWANDEV:
3235	return compat_siocwandev(net, argp);
3236	case SIOCGIFMAP:
3237	case SIOCSIFMAP:
3238	return compat_sioc_ifmap(net, cmd, argp);
3239	case SIOCBONDENSLAVE:
3240	case SIOCBONDRELEASE:
3241	case SIOCBONDSETHWADDR:
3242	case SIOCBONDCHANGEACTIVE:
3243	return bond_ioctl(net, cmd, argp);
3244	case SIOCADDRT:
3245	case SIOCDELRT:
3246	return routing_ioctl(net, sock, cmd, argp);
3247	case SIOCGSTAMP:
3248	return do_siocgstamp(net, sock, cmd, argp);
3249	case SIOCGSTAMPNS:
3250	return do_siocgstampns(net, sock, cmd, argp);
3251	case SIOCBONDSLAVEINFOQUERY:
3252	case SIOCBONDINFOQUERY:
3253	case SIOCSHWTSTAMP:
3254	case SIOCGHWTSTAMP:
3255	return compat_ifr_data_ioctl(net, cmd, argp);
3256
3257	case FIOSETOWN:
3258	case SIOCSPGRP:
3259	case FIOGETOWN:
3260	case SIOCGPGRP:
3261	case SIOCBRADDBR:
3262	case SIOCBRDELBR:
3263	case SIOCGIFVLAN:
3264	case SIOCSIFVLAN:
3265	case SIOCADDDLCI:
3266	case SIOCDELDLCI:
3267	return sock_ioctl(file, cmd, arg);
3268
3269	case SIOCGIFFLAGS:
3270	case SIOCSIFFLAGS:
3271	case SIOCGIFMETRIC:
3272	case SIOCSIFMETRIC:
3273	case SIOCGIFMTU:
3274	case SIOCSIFMTU:
3275	case SIOCGIFMEM:
3276	case SIOCSIFMEM:
3277	case SIOCGIFHWADDR:
3278	case SIOCSIFHWADDR:
3279	case SIOCADDMULTI:
3280	case SIOCDELMULTI:
3281	case SIOCGIFINDEX:
3282	case SIOCGIFADDR:
3283	case SIOCSIFADDR:
3284	case SIOCSIFHWBROADCAST:
3285	case SIOCDIFADDR:
3286	case SIOCGIFBRDADDR:
3287	case SIOCSIFBRDADDR:
3288	case SIOCGIFDSTADDR:
3289	case SIOCSIFDSTADDR:
3290	case SIOCGIFNETMASK:
3291	case SIOCSIFNETMASK:
3292	case SIOCSIFPFLAGS:
3293	case SIOCGIFPFLAGS:
3294	case SIOCGIFTXQLEN:
3295	case SIOCSIFTXQLEN:
3296	case SIOCBRADDIF:
3297	case SIOCBRDELIF:
3298	case SIOCSIFNAME:
3299	case SIOCGMIIPHY:
3300	case SIOCGMIIREG:
3301	case SIOCSMIIREG:
3302	return dev_ifsioc(net, sock, cmd, argp);
3303
3304	case SIOCSARP:
3305	case SIOCGARP:
3306	case SIOCDARP:
3307	case SIOCATMARK:
3308	return sock_do_ioctl(net, sock, cmd, arg);
3309	}
3310
3311	return -ENOIOCTLCMD;
3312	}
3313
3314	static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3315	unsigned long arg)
3316	{
3317	struct socket *sock = file->private_data;
3318	int ret = -ENOIOCTLCMD;
3319	struct sock *sk;
3320	struct net *net;
3321
3322	sk = sock->sk;
3323	net = sock_net(sk);
3324
3325	if (sock->ops->compat_ioctl)
3326	ret = sock->ops->compat_ioctl(sock, cmd, arg);
3327
3328	if (ret == -ENOIOCTLCMD &&
3329	(cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3330	ret = compat_wext_handle_ioctl(net, cmd, arg);
3331
3332	if (ret == -ENOIOCTLCMD)
3333	ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3334
3335	return ret;
3336	}
3337	#endif
3338
3339	int kernel_bind(struct socket sock, struct sockaddr addr, int addrlen)
3340	{
3341	return sock->ops->bind(sock, addr, addrlen);
3342	}
3343	EXPORT_SYMBOL(kernel_bind);
3344
3345	int kernel_listen(struct socket *sock, int backlog)
3346	{
3347	return sock->ops->listen(sock, backlog);
3348	}
3349	EXPORT_SYMBOL(kernel_listen);
3350
3351	int kernel_accept(struct socket sock, struct socket *newsock, int flags)
3352	{
3353	struct sock *sk = sock->sk;
3354	int err;
3355
3356	err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3357	newsock);
3358	if (err < 0)
3359	goto done;
3360
3361	err = sock->ops->accept(sock, *newsock, flags);
3362	if (err < 0) {
3363	sock_release(*newsock);
3364	*newsock = NULL;
3365	goto done;
3366	}
3367
3368	(*newsock)->ops = sock->ops;
3369	__module_get((*newsock)->ops->owner);
3370
3371	done:
3372	return err;
3373	}
3374	EXPORT_SYMBOL(kernel_accept);
3375
3376	int kernel_connect(struct socket sock, struct sockaddr addr, int addrlen,
3377	int flags)
3378	{
3379	return sock->ops->connect(sock, addr, addrlen, flags);
3380	}
3381	EXPORT_SYMBOL(kernel_connect);
3382
3383	int kernel_getsockname(struct socket sock, struct sockaddr addr,
3384	int *addrlen)
3385	{
3386	return sock->ops->getname(sock, addr, addrlen, 0);
3387	}
3388	EXPORT_SYMBOL(kernel_getsockname);
3389
3390	int kernel_getpeername(struct socket sock, struct sockaddr addr,
3391	int *addrlen)
3392	{
3393	return sock->ops->getname(sock, addr, addrlen, 1);
3394	}
3395	EXPORT_SYMBOL(kernel_getpeername);
3396
3397	int kernel_getsockopt(struct socket *sock, int level, int optname,
3398	char optval, int optlen)
3399	{
3400	mm_segment_t oldfs = get_fs();
3401	char __user *uoptval;
3402	int __user *uoptlen;
3403	int err;
3404
3405	uoptval = (char __user __force *) optval;
3406	uoptlen = (int __user __force *) optlen;
3407
3408	set_fs(KERNEL_DS);
3409	if (level == SOL_SOCKET)
3410	err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3411	else
3412	err = sock->ops->getsockopt(sock, level, optname, uoptval,
3413	uoptlen);
3414	set_fs(oldfs);
3415	return err;
3416	}
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	int err;
3425
3426	uoptval = (char __user __force *) optval;
3427
3428	set_fs(KERNEL_DS);
3429	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	optlen);
3434	set_fs(oldfs);
3435	return err;
3436	}
3437	EXPORT_SYMBOL(kernel_setsockopt);
3438
3439	int kernel_sendpage(struct socket sock, struct page page, int offset,
3440	size_t size, int flags)
3441	{
3442	if (sock->ops->sendpage)
3443	return sock->ops->sendpage(sock, page, offset, size, flags);
3444
3445	return sock_no_sendpage(sock, page, offset, size, flags);
3446	}
3447	EXPORT_SYMBOL(kernel_sendpage);
3448
3449	int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3450	{
3451	mm_segment_t oldfs = get_fs();
3452	int err;
3453
3454	set_fs(KERNEL_DS);
3455	err = sock->ops->ioctl(sock, cmd, arg);
3456	set_fs(oldfs);
3457
3458	return err;
3459	}
3460	EXPORT_SYMBOL(kernel_sock_ioctl);
3461
3462	int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3463	{
3464	return sock->ops->shutdown(sock, how);
3465	}
3466	EXPORT_SYMBOL(kernel_sock_shutdown);