linux - net/socket.c

3721 lines · 90.6 KiB

1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* NET An implementation of the SOCKET network access protocol.
4	*
5	* Version: @(#)socket.c 1.1.93 18/02/95
6	*
7	* Authors: Orest Zborowski, <[email protected]>
8	* Ross Biro
9	* Fred N. van Kempen, <[email protected]>
10	*
11	* Fixes:
12	* Anonymous : NOTSOCK/BADF cleanup. Error fix in
13	* shutdown()
14	* Alan Cox : verify_area() fixes
15	* Alan Cox : Removed DDI
16	* Jonathan Kamens : SOCK_DGRAM reconnect bug
17	* Alan Cox : Moved a load of checks to the very
18	* top level.
19	* Alan Cox : Move address structures to/from user
20	* mode above the protocol layers.
21	* Rob Janssen : Allow 0 length sends.
22	* Alan Cox : Asynchronous I/O support (cribbed from the
23	* tty drivers).
24	* Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
25	* Jeff Uphoff : Made max number of sockets command-line
26	* configurable.
27	* Matti Aarnio : Made the number of sockets dynamic,
28	* to be allocated when needed, and mr.
29	* Uphoff's max is used as max to be
30	* allowed to allocate.
31	* Linus : Argh. removed all the socket allocation
32	* altogether: it's in the inode now.
33	* Alan Cox : Made sock_alloc()/sock_release() public
34	* for NetROM and future kernel nfsd type
35	* stuff.
36	* Alan Cox : sendmsg/recvmsg basics.
37	* Tom Dyas : Export net symbols.
38	* Marcin Dalecki : Fixed problems with CONFIG_NET="n".
39	* Alan Cox : Added thread locking to sys_* calls
40	* for sockets. May have errors at the
41	* moment.
42	* Kevin Buhr : Fixed the dumb errors in the above.
43	* Andi Kleen : Some small cleanups, optimizations,
44	* and fixed a copy_from_user() bug.
45	* Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
46	* Tigran Aivazian : Made listen(2) backlog sanity checks
47	* protocol-independent
48	*
49	* This module is effectively the top level interface to the BSD socket
50	* paradigm.
51	*
52	* Based upon Swansea University Computer Society NET3.039
53	*/
54
55	#include <linux/bpf-cgroup.h>
56	#include <linux/ethtool.h>
57	#include <linux/mm.h>
58	#include <linux/socket.h>
59	#include <linux/file.h>
60	#include <linux/splice.h>
61	#include <linux/net.h>
62	#include <linux/interrupt.h>
63	#include <linux/thread_info.h>
64	#include <linux/rcupdate.h>
65	#include <linux/netdevice.h>
66	#include <linux/proc_fs.h>
67	#include <linux/seq_file.h>
68	#include <linux/mutex.h>
69	#include <linux/if_bridge.h>
70	#include <linux/if_vlan.h>
71	#include <linux/ptp_classify.h>
72	#include <linux/init.h>
73	#include <linux/poll.h>
74	#include <linux/cache.h>
75	#include <linux/module.h>
76	#include <linux/highmem.h>
77	#include <linux/mount.h>
78	#include <linux/pseudo_fs.h>
79	#include <linux/security.h>
80	#include <linux/syscalls.h>
81	#include <linux/compat.h>
82	#include <linux/kmod.h>
83	#include <linux/audit.h>
84	#include <linux/wireless.h>
85	#include <linux/nsproxy.h>
86	#include <linux/magic.h>
87	#include <linux/slab.h>
88	#include <linux/xattr.h>
89	#include <linux/nospec.h>
90	#include <linux/indirect_call_wrapper.h>
91	#include <linux/io_uring/net.h>
92
93	#include <linux/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/termios.h>
107	#include <linux/sockios.h>
108	#include <net/busy_poll.h>
109	#include <linux/errqueue.h>
110	#include <linux/ptp_clock_kernel.h>
111	#include <trace/events/sock.h>
112
113	#ifdef CONFIG_NET_RX_BUSY_POLL
114	unsigned int sysctl_net_busy_read __read_mostly;
115	unsigned int sysctl_net_busy_poll __read_mostly;
116	#endif
117
118	static ssize_t sock_read_iter(struct kiocb iocb, struct iov_iter to);
119	static ssize_t sock_write_iter(struct kiocb iocb, struct iov_iter from);
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 __poll_t 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_splice_read(struct file file, loff_t ppos,
132	struct pipe_inode_info *pipe, size_t len,
133	unsigned int flags);
134	static void sock_splice_eof(struct file *file);
135
136	#ifdef CONFIG_PROC_FS
137	static void sock_show_fdinfo(struct seq_file m, struct file f)
138	{
139	struct socket *sock = f->private_data;
140	const struct proto_ops *ops = READ_ONCE(sock->ops);
141
142	if (ops->show_fdinfo)
143	ops->show_fdinfo(m, sock);
144	}
145	#else
146	#define sock_show_fdinfo NULL
147	#endif
148
149	/*
150	* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
151	* in the operation structures but are done directly via the socketcall() multiplexor.
152	*/
153
154	static const struct file_operations socket_file_ops = {
155	.owner = THIS_MODULE,
156	.read_iter = sock_read_iter,
157	.write_iter = sock_write_iter,
158	.poll = sock_poll,
159	.unlocked_ioctl = sock_ioctl,
160	#ifdef CONFIG_COMPAT
161	.compat_ioctl = compat_sock_ioctl,
162	#endif
163	.uring_cmd = io_uring_cmd_sock,
164	.mmap = sock_mmap,
165	.release = sock_close,
166	.fasync = sock_fasync,
167	.splice_write = splice_to_socket,
168	.splice_read = sock_splice_read,
169	.splice_eof = sock_splice_eof,
170	.show_fdinfo = sock_show_fdinfo,
171	};
172
173	static const char * const pf_family_names[] = {
174	[PF_UNSPEC] = "PF_UNSPEC",
175	[PF_UNIX] = "PF_UNIX/PF_LOCAL",
176	[PF_INET] = "PF_INET",
177	[PF_AX25] = "PF_AX25",
178	[PF_IPX] = "PF_IPX",
179	[PF_APPLETALK] = "PF_APPLETALK",
180	[PF_NETROM] = "PF_NETROM",
181	[PF_BRIDGE] = "PF_BRIDGE",
182	[PF_ATMPVC] = "PF_ATMPVC",
183	[PF_X25] = "PF_X25",
184	[PF_INET6] = "PF_INET6",
185	[PF_ROSE] = "PF_ROSE",
186	[PF_DECnet] = "PF_DECnet",
187	[PF_NETBEUI] = "PF_NETBEUI",
188	[PF_SECURITY] = "PF_SECURITY",
189	[PF_KEY] = "PF_KEY",
190	[PF_NETLINK] = "PF_NETLINK/PF_ROUTE",
191	[PF_PACKET] = "PF_PACKET",
192	[PF_ASH] = "PF_ASH",
193	[PF_ECONET] = "PF_ECONET",
194	[PF_ATMSVC] = "PF_ATMSVC",
195	[PF_RDS] = "PF_RDS",
196	[PF_SNA] = "PF_SNA",
197	[PF_IRDA] = "PF_IRDA",
198	[PF_PPPOX] = "PF_PPPOX",
199	[PF_WANPIPE] = "PF_WANPIPE",
200	[PF_LLC] = "PF_LLC",
201	[PF_IB] = "PF_IB",
202	[PF_MPLS] = "PF_MPLS",
203	[PF_CAN] = "PF_CAN",
204	[PF_TIPC] = "PF_TIPC",
205	[PF_BLUETOOTH] = "PF_BLUETOOTH",
206	[PF_IUCV] = "PF_IUCV",
207	[PF_RXRPC] = "PF_RXRPC",
208	[PF_ISDN] = "PF_ISDN",
209	[PF_PHONET] = "PF_PHONET",
210	[PF_IEEE802154] = "PF_IEEE802154",
211	[PF_CAIF] = "PF_CAIF",
212	[PF_ALG] = "PF_ALG",
213	[PF_NFC] = "PF_NFC",
214	[PF_VSOCK] = "PF_VSOCK",
215	[PF_KCM] = "PF_KCM",
216	[PF_QIPCRTR] = "PF_QIPCRTR",
217	[PF_SMC] = "PF_SMC",
218	[PF_XDP] = "PF_XDP",
219	[PF_MCTP] = "PF_MCTP",
220	};
221
222	/*
223	* The protocol list. Each protocol is registered in here.
224	*/
225
226	static DEFINE_SPINLOCK(net_family_lock);
227	static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
228
229	/*
230	* Support routines.
231	* Move socket addresses back and forth across the kernel/user
232	* divide and look after the messy bits.
233	*/
234
235	/**
236	* move_addr_to_kernel - copy a socket address into kernel space
237	* @uaddr: Address in user space
238	* @kaddr: Address in kernel space
239	* @ulen: Length in user space
240	*
241	* The address is copied into kernel space. If the provided address is
242	* too long an error code of -EINVAL is returned. If the copy gives
243	* invalid addresses -EFAULT is returned. On a success 0 is returned.
244	*/
245
246	int move_addr_to_kernel(void __user uaddr, int ulen, struct sockaddr_storage kaddr)
247	{
248	if (ulen < 0 \|\| ulen > sizeof(struct sockaddr_storage))
249	return -EINVAL;
250	if (ulen == 0)
251	return 0;
252	if (copy_from_user(kaddr, uaddr, ulen))
253	return -EFAULT;
254	return audit_sockaddr(ulen, kaddr);
255	}
256
257	/**
258	* move_addr_to_user - copy an address to user space
259	* @kaddr: kernel space address
260	* @klen: length of address in kernel
261	* @uaddr: user space address
262	* @ulen: pointer to user length field
263	*
264	* The value pointed to by ulen on entry is the buffer length available.
265	* This is overwritten with the buffer space used. -EINVAL is returned
266	* if an overlong buffer is specified or a negative buffer size. -EFAULT
267	* is returned if either the buffer or the length field are not
268	* accessible.
269	* After copying the data up to the limit the user specifies, the true
270	* length of the data is written over the length limit the user
271	* specified. Zero is returned for a success.
272	*/
273
274	static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
275	void __user uaddr, int __user ulen)
276	{
277	int err;
278	int len;
279
280	BUG_ON(klen > sizeof(struct sockaddr_storage));
281	err = get_user(len, ulen);
282	if (err)
283	return err;
284	if (len > klen)
285	len = klen;
286	if (len < 0)
287	return -EINVAL;
288	if (len) {
289	if (audit_sockaddr(klen, kaddr))
290	return -ENOMEM;
291	if (copy_to_user(uaddr, kaddr, len))
292	return -EFAULT;
293	}
294	/*
295	* "fromlen shall refer to the value before truncation.."
296	* 1003.1g
297	*/
298	return __put_user(klen, ulen);
299	}
300
301	static struct kmem_cache *sock_inode_cachep __ro_after_init;
302
303	static struct inode sock_alloc_inode(struct super_block sb)
304	{
305	struct socket_alloc *ei;
306
307	ei = alloc_inode_sb(sb, sock_inode_cachep, GFP_KERNEL);
308	if (!ei)
309	return NULL;
310	init_waitqueue_head(&ei->socket.wq.wait);
311	ei->socket.wq.fasync_list = NULL;
312	ei->socket.wq.flags = 0;
313
314	ei->socket.state = SS_UNCONNECTED;
315	ei->socket.flags = 0;
316	ei->socket.ops = NULL;
317	ei->socket.sk = NULL;
318	ei->socket.file = NULL;
319
320	return &ei->vfs_inode;
321	}
322
323	static void sock_free_inode(struct inode *inode)
324	{
325	struct socket_alloc *ei;
326
327	ei = container_of(inode, struct socket_alloc, vfs_inode);
328	kmem_cache_free(sock_inode_cachep, ei);
329	}
330
331	static void init_once(void *foo)
332	{
333	struct socket_alloc ei = (struct socket_alloc )foo;
334
335	inode_init_once(&ei->vfs_inode);
336	}
337
338	static void init_inodecache(void)
339	{
340	sock_inode_cachep = kmem_cache_create("sock_inode_cache",
341	sizeof(struct socket_alloc),
342	0,
343	(SLAB_HWCACHE_ALIGN \|
344	SLAB_RECLAIM_ACCOUNT \|
345	SLAB_ACCOUNT),
346	init_once);
347	BUG_ON(sock_inode_cachep == NULL);
348	}
349
350	static const struct super_operations sockfs_ops = {
351	.alloc_inode = sock_alloc_inode,
352	.free_inode = sock_free_inode,
353	.statfs = simple_statfs,
354	};
355
356	/*
357	* sockfs_dname() is called from d_path().
358	*/
359	static char sockfs_dname(struct dentry dentry, char *buffer, int buflen)
360	{
361	return dynamic_dname(buffer, buflen, "socket:[%lu]",
362	d_inode(dentry)->i_ino);
363	}
364
365	static const struct dentry_operations sockfs_dentry_operations = {
366	.d_dname = sockfs_dname,
367	};
368
369	static int sockfs_xattr_get(const struct xattr_handler *handler,
370	struct dentry dentry, struct inode inode,
371	const char suffix, void value, size_t size)
372	{
373	if (value) {
374	if (dentry->d_name.len + 1 > size)
375	return -ERANGE;
376	memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
377	}
378	return dentry->d_name.len + 1;
379	}
380
381	#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
382	#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
383	#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
384
385	static const struct xattr_handler sockfs_xattr_handler = {
386	.name = XATTR_NAME_SOCKPROTONAME,
387	.get = sockfs_xattr_get,
388	};
389
390	static int sockfs_security_xattr_set(const struct xattr_handler *handler,
391	struct mnt_idmap *idmap,
392	struct dentry dentry, struct inode inode,
393	const char suffix, const void value,
394	size_t size, int flags)
395	{
396	/* Handled by LSM. */
397	return -EAGAIN;
398	}
399
400	static const struct xattr_handler sockfs_security_xattr_handler = {
401	.prefix = XATTR_SECURITY_PREFIX,
402	.set = sockfs_security_xattr_set,
403	};
404
405	static const struct xattr_handler * const sockfs_xattr_handlers[] = {
406	&sockfs_xattr_handler,
407	&sockfs_security_xattr_handler,
408	NULL
409	};
410
411	static int sockfs_init_fs_context(struct fs_context *fc)
412	{
413	struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
414	if (!ctx)
415	return -ENOMEM;
416	ctx->ops = &sockfs_ops;
417	ctx->dops = &sockfs_dentry_operations;
418	ctx->xattr = sockfs_xattr_handlers;
419	return 0;
420	}
421
422	static struct vfsmount *sock_mnt __read_mostly;
423
424	static struct file_system_type sock_fs_type = {
425	.name = "sockfs",
426	.init_fs_context = sockfs_init_fs_context,
427	.kill_sb = kill_anon_super,
428	};
429
430	/*
431	* Obtains the first available file descriptor and sets it up for use.
432	*
433	* These functions create file structures and maps them to fd space
434	* of the current process. On success it returns file descriptor
435	* and file struct implicitly stored in sock->file.
436	* Note that another thread may close file descriptor before we return
437	* from this function. We use the fact that now we do not refer
438	* to socket after mapping. If one day we will need it, this
439	* function will increment ref. count on file by 1.
440	*
441	* In any case returned fd MAY BE not valid!
442	* This race condition is unavoidable
443	* with shared fd spaces, we cannot solve it inside kernel,
444	* but we take care of internal coherence yet.
445	*/
446
447	/**
448	* sock_alloc_file - Bind a &socket to a &file
449	* @sock: socket
450	* @flags: file status flags
451	* @dname: protocol name
452	*
453	* Returns the &file bound with @sock, implicitly storing it
454	* in sock->file. If dname is %NULL, sets to "".
455	*
456	* On failure @sock is released, and an ERR pointer is returned.
457	*
458	* This function uses GFP_KERNEL internally.
459	*/
460
461	struct file sock_alloc_file(struct socket sock, int flags, const char *dname)
462	{
463	struct file *file;
464
465	if (!dname)
466	dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
467
468	file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
469	O_RDWR \| (flags & O_NONBLOCK),
470	&socket_file_ops);
471	if (IS_ERR(file)) {
472	sock_release(sock);
473	return file;
474	}
475
476	file->f_mode \|= FMODE_NOWAIT;
477	sock->file = file;
478	file->private_data = sock;
479	stream_open(SOCK_INODE(sock), file);
480	return file;
481	}
482	EXPORT_SYMBOL(sock_alloc_file);
483
484	static int sock_map_fd(struct socket *sock, int flags)
485	{
486	struct file *newfile;
487	int fd = get_unused_fd_flags(flags);
488	if (unlikely(fd < 0)) {
489	sock_release(sock);
490	return fd;
491	}
492
493	newfile = sock_alloc_file(sock, flags, NULL);
494	if (!IS_ERR(newfile)) {
495	fd_install(fd, newfile);
496	return fd;
497	}
498
499	put_unused_fd(fd);
500	return PTR_ERR(newfile);
501	}
502
503	/**
504	* sock_from_file - Return the &socket bounded to @file.
505	* @file: file
506	*
507	* On failure returns %NULL.
508	*/
509
510	struct socket sock_from_file(struct file file)
511	{
512	if (likely(file->f_op == &socket_file_ops))
513	return file->private_data; /* set in sock_alloc_file */
514
515	return NULL;
516	}
517	EXPORT_SYMBOL(sock_from_file);
518
519	/**
520	* sockfd_lookup - Go from a file number to its socket slot
521	* @fd: file handle
522	* @err: pointer to an error code return
523	*
524	* The file handle passed in is locked and the socket it is bound
525	* to is returned. If an error occurs the err pointer is overwritten
526	* with a negative errno code and NULL is returned. The function checks
527	* for both invalid handles and passing a handle which is not a socket.
528	*
529	* On a success the socket object pointer is returned.
530	*/
531
532	struct socket sockfd_lookup(int fd, int err)
533	{
534	struct file *file;
535	struct socket *sock;
536
537	file = fget(fd);
538	if (!file) {
539	*err = -EBADF;
540	return NULL;
541	}
542
543	sock = sock_from_file(file);
544	if (!sock) {
545	*err = -ENOTSOCK;
546	fput(file);
547	}
548	return sock;
549	}
550	EXPORT_SYMBOL(sockfd_lookup);
551
552	static ssize_t sockfs_listxattr(struct dentry dentry, char buffer,
553	size_t size)
554	{
555	ssize_t len;
556	ssize_t used = 0;
557
558	len = security_inode_listsecurity(d_inode(dentry), buffer, size);
559	if (len < 0)
560	return len;
561	used += len;
562	if (buffer) {
563	if (size < used)
564	return -ERANGE;
565	buffer += len;
566	}
567
568	len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
569	used += len;
570	if (buffer) {
571	if (size < used)
572	return -ERANGE;
573	memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
574	buffer += len;
575	}
576
577	return used;
578	}
579
580	static int sockfs_setattr(struct mnt_idmap *idmap,
581	struct dentry dentry, struct iattr iattr)
582	{
583	int err = simple_setattr(&nop_mnt_idmap, dentry, iattr);
584
585	if (!err && (iattr->ia_valid & ATTR_UID)) {
586	struct socket *sock = SOCKET_I(d_inode(dentry));
587
588	if (sock->sk)
589	sock->sk->sk_uid = iattr->ia_uid;
590	else
591	err = -ENOENT;
592	}
593
594	return err;
595	}
596
597	static const struct inode_operations sockfs_inode_ops = {
598	.listxattr = sockfs_listxattr,
599	.setattr = sockfs_setattr,
600	};
601
602	/**
603	* sock_alloc - allocate a socket
604	*
605	* Allocate a new inode and socket object. The two are bound together
606	* and initialised. The socket is then returned. If we are out of inodes
607	* NULL is returned. This functions uses GFP_KERNEL internally.
608	*/
609
610	struct socket *sock_alloc(void)
611	{
612	struct inode *inode;
613	struct socket *sock;
614
615	inode = new_inode_pseudo(sock_mnt->mnt_sb);
616	if (!inode)
617	return NULL;
618
619	sock = SOCKET_I(inode);
620
621	inode->i_ino = get_next_ino();
622	inode->i_mode = S_IFSOCK \| S_IRWXUGO;
623	inode->i_uid = current_fsuid();
624	inode->i_gid = current_fsgid();
625	inode->i_op = &sockfs_inode_ops;
626
627	return sock;
628	}
629	EXPORT_SYMBOL(sock_alloc);
630
631	static void __sock_release(struct socket sock, struct inode inode)
632	{
633	const struct proto_ops *ops = READ_ONCE(sock->ops);
634
635	if (ops) {
636	struct module *owner = ops->owner;
637
638	if (inode)
639	inode_lock(inode);
640	ops->release(sock);
641	sock->sk = NULL;
642	if (inode)
643	inode_unlock(inode);
644	sock->ops = NULL;
645	module_put(owner);
646	}
647
648	if (sock->wq.fasync_list)
649	pr_err("%s: fasync list not empty!\n", __func__);
650
651	if (!sock->file) {
652	iput(SOCK_INODE(sock));
653	return;
654	}
655	sock->file = NULL;
656	}
657
658	/**
659	* sock_release - close a socket
660	* @sock: socket to close
661	*
662	* The socket is released from the protocol stack if it has a release
663	* callback, and the inode is then released if the socket is bound to
664	* an inode not a file.
665	*/
666	void sock_release(struct socket *sock)
667	{
668	__sock_release(sock, NULL);
669	}
670	EXPORT_SYMBOL(sock_release);
671
672	void __sock_tx_timestamp(__u32 tsflags, __u8 *tx_flags)
673	{
674	u8 flags = *tx_flags;
675
676	if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) {
677	flags \|= SKBTX_HW_TSTAMP;
678
679	/* PTP hardware clocks can provide a free running cycle counter
680	* as a time base for virtual clocks. Tell driver to use the
681	* free running cycle counter for timestamp if socket is bound
682	* to virtual clock.
683	*/
684	if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
685	flags \|= SKBTX_HW_TSTAMP_USE_CYCLES;
686	}
687
688	if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
689	flags \|= SKBTX_SW_TSTAMP;
690
691	if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
692	flags \|= SKBTX_SCHED_TSTAMP;
693
694	*tx_flags = flags;
695	}
696	EXPORT_SYMBOL(__sock_tx_timestamp);
697
698	INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket , struct msghdr ,
699	size_t));
700	INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket , struct msghdr ,
701	size_t));
702
703	static noinline void call_trace_sock_send_length(struct sock *sk, int ret,
704	int flags)
705	{
706	trace_sock_send_length(sk, ret, 0);
707	}
708
709	static inline int sock_sendmsg_nosec(struct socket sock, struct msghdr msg)
710	{
711	int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->sendmsg, inet6_sendmsg,
712	inet_sendmsg, sock, msg,
713	msg_data_left(msg));
714	BUG_ON(ret == -EIOCBQUEUED);
715
716	if (trace_sock_send_length_enabled())
717	call_trace_sock_send_length(sock->sk, ret, 0);
718	return ret;
719	}
720
721	static int __sock_sendmsg(struct socket sock, struct msghdr msg)
722	{
723	int err = security_socket_sendmsg(sock, msg,
724	msg_data_left(msg));
725
726	return err ?: sock_sendmsg_nosec(sock, msg);
727	}
728
729	/**
730	* sock_sendmsg - send a message through @sock
731	* @sock: socket
732	* @msg: message to send
733	*
734	* Sends @msg through @sock, passing through LSM.
735	* Returns the number of bytes sent, or an error code.
736	*/
737	int sock_sendmsg(struct socket sock, struct msghdr msg)
738	{
739	struct sockaddr_storage save_addr = (struct sockaddr_storage )msg->msg_name;
740	struct sockaddr_storage address;
741	int save_len = msg->msg_namelen;
742	int ret;
743
744	if (msg->msg_name) {
745	memcpy(&address, msg->msg_name, msg->msg_namelen);
746	msg->msg_name = &address;
747	}
748
749	ret = __sock_sendmsg(sock, msg);
750	msg->msg_name = save_addr;
751	msg->msg_namelen = save_len;
752
753	return ret;
754	}
755	EXPORT_SYMBOL(sock_sendmsg);
756
757	/**
758	* kernel_sendmsg - send a message through @sock (kernel-space)
759	* @sock: socket
760	* @msg: message header
761	* @vec: kernel vec
762	* @num: vec array length
763	* @size: total message data size
764	*
765	* Builds the message data with @vec and sends it through @sock.
766	* Returns the number of bytes sent, or an error code.
767	*/
768
769	int kernel_sendmsg(struct socket sock, struct msghdr msg,
770	struct kvec *vec, size_t num, size_t size)
771	{
772	iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size);
773	return sock_sendmsg(sock, msg);
774	}
775	EXPORT_SYMBOL(kernel_sendmsg);
776
777	/**
778	* kernel_sendmsg_locked - send a message through @sock (kernel-space)
779	* @sk: sock
780	* @msg: message header
781	* @vec: output s/g array
782	* @num: output s/g array length
783	* @size: total message data size
784	*
785	* Builds the message data with @vec and sends it through @sock.
786	* Returns the number of bytes sent, or an error code.
787	* Caller must hold @sk.
788	*/
789
790	int kernel_sendmsg_locked(struct sock sk, struct msghdr msg,
791	struct kvec *vec, size_t num, size_t size)
792	{
793	struct socket *sock = sk->sk_socket;
794	const struct proto_ops *ops = READ_ONCE(sock->ops);
795
796	if (!ops->sendmsg_locked)
797	return sock_no_sendmsg_locked(sk, msg, size);
798
799	iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size);
800
801	return ops->sendmsg_locked(sk, msg, msg_data_left(msg));
802	}
803	EXPORT_SYMBOL(kernel_sendmsg_locked);
804
805	static bool skb_is_err_queue(const struct sk_buff *skb)
806	{
807	/* pkt_type of skbs enqueued on the error queue are set to
808	* PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
809	* in recvmsg, since skbs received on a local socket will never
810	* have a pkt_type of PACKET_OUTGOING.
811	*/
812	return skb->pkt_type == PACKET_OUTGOING;
813	}
814
815	/* On transmit, software and hardware timestamps are returned independently.
816	* As the two skb clones share the hardware timestamp, which may be updated
817	* before the software timestamp is received, a hardware TX timestamp may be
818	* returned only if there is no software TX timestamp. Ignore false software
819	* timestamps, which may be made in the __sock_recv_timestamp() call when the
820	* option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
821	* hardware timestamp.
822	*/
823	static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
824	{
825	return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
826	}
827
828	static ktime_t get_timestamp(struct sock sk, struct sk_buff skb, int *if_index)
829	{
830	bool cycles = READ_ONCE(sk->sk_tsflags) & SOF_TIMESTAMPING_BIND_PHC;
831	struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
832	struct net_device *orig_dev;
833	ktime_t hwtstamp;
834
835	rcu_read_lock();
836	orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
837	if (orig_dev) {
838	*if_index = orig_dev->ifindex;
839	hwtstamp = netdev_get_tstamp(orig_dev, shhwtstamps, cycles);
840	} else {
841	hwtstamp = shhwtstamps->hwtstamp;
842	}
843	rcu_read_unlock();
844
845	return hwtstamp;
846	}
847
848	static void put_ts_pktinfo(struct msghdr msg, struct sk_buff skb,
849	int if_index)
850	{
851	struct scm_ts_pktinfo ts_pktinfo;
852	struct net_device *orig_dev;
853
854	if (!skb_mac_header_was_set(skb))
855	return;
856
857	memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
858
859	if (!if_index) {
860	rcu_read_lock();
861	orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
862	if (orig_dev)
863	if_index = orig_dev->ifindex;
864	rcu_read_unlock();
865	}
866	ts_pktinfo.if_index = if_index;
867
868	ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
869	put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
870	sizeof(ts_pktinfo), &ts_pktinfo);
871	}
872
873	/*
874	* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
875	*/
876	void __sock_recv_timestamp(struct msghdr msg, struct sock sk,
877	struct sk_buff *skb)
878	{
879	int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
880	int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
881	struct scm_timestamping_internal tss;
882	int empty = 1, false_tstamp = 0;
883	struct skb_shared_hwtstamps *shhwtstamps =
884	skb_hwtstamps(skb);
885	int if_index;
886	ktime_t hwtstamp;
887	u32 tsflags;
888
889	/* Race occurred between timestamp enabling and packet
890	receiving. Fill in the current time for now. */
891	if (need_software_tstamp && skb->tstamp == 0) {
892	__net_timestamp(skb);
893	false_tstamp = 1;
894	}
895
896	if (need_software_tstamp) {
897	if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
898	if (new_tstamp) {
899	struct __kernel_sock_timeval tv;
900
901	skb_get_new_timestamp(skb, &tv);
902	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
903	sizeof(tv), &tv);
904	} else {
905	struct __kernel_old_timeval tv;
906
907	skb_get_timestamp(skb, &tv);
908	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
909	sizeof(tv), &tv);
910	}
911	} else {
912	if (new_tstamp) {
913	struct __kernel_timespec ts;
914
915	skb_get_new_timestampns(skb, &ts);
916	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
917	sizeof(ts), &ts);
918	} else {
919	struct __kernel_old_timespec ts;
920
921	skb_get_timestampns(skb, &ts);
922	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
923	sizeof(ts), &ts);
924	}
925	}
926	}
927
928	memset(&tss, 0, sizeof(tss));
929	tsflags = READ_ONCE(sk->sk_tsflags);
930	if ((tsflags & SOF_TIMESTAMPING_SOFTWARE &&
931	(tsflags & SOF_TIMESTAMPING_RX_SOFTWARE \|\|
932	skb_is_err_queue(skb) \|\|
933	!(tsflags & SOF_TIMESTAMPING_OPT_RX_FILTER))) &&
934	ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
935	empty = 0;
936	if (shhwtstamps &&
937	(tsflags & SOF_TIMESTAMPING_RAW_HARDWARE &&
938	(tsflags & SOF_TIMESTAMPING_RX_HARDWARE \|\|
939	skb_is_err_queue(skb) \|\|
940	!(tsflags & SOF_TIMESTAMPING_OPT_RX_FILTER))) &&
941	!skb_is_swtx_tstamp(skb, false_tstamp)) {
942	if_index = 0;
943	if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP_NETDEV)
944	hwtstamp = get_timestamp(sk, skb, &if_index);
945	else
946	hwtstamp = shhwtstamps->hwtstamp;
947
948	if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
949	hwtstamp = ptp_convert_timestamp(&hwtstamp,
950	READ_ONCE(sk->sk_bind_phc));
951
952	if (ktime_to_timespec64_cond(hwtstamp, tss.ts + 2)) {
953	empty = 0;
954
955	if ((tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
956	!skb_is_err_queue(skb))
957	put_ts_pktinfo(msg, skb, if_index);
958	}
959	}
960	if (!empty) {
961	if (sock_flag(sk, SOCK_TSTAMP_NEW))
962	put_cmsg_scm_timestamping64(msg, &tss);
963	else
964	put_cmsg_scm_timestamping(msg, &tss);
965
966	if (skb_is_err_queue(skb) && skb->len &&
967	SKB_EXT_ERR(skb)->opt_stats)
968	put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
969	skb->len, skb->data);
970	}
971	}
972	EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
973
974	#ifdef CONFIG_WIRELESS
975	void __sock_recv_wifi_status(struct msghdr msg, struct sock sk,
976	struct sk_buff *skb)
977	{
978	int ack;
979
980	if (!sock_flag(sk, SOCK_WIFI_STATUS))
981	return;
982	if (!skb->wifi_acked_valid)
983	return;
984
985	ack = skb->wifi_acked;
986
987	put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
988	}
989	EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
990	#endif
991
992	static inline void sock_recv_drops(struct msghdr msg, struct sock sk,
993	struct sk_buff *skb)
994	{
995	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
996	put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
997	sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
998	}
999
1000	static void sock_recv_mark(struct msghdr msg, struct sock sk,
1001	struct sk_buff *skb)
1002	{
1003	if (sock_flag(sk, SOCK_RCVMARK) && skb) {
1004	/* We must use a bounce buffer for CONFIG_HARDENED_USERCOPY=y */
1005	__u32 mark = skb->mark;
1006
1007	put_cmsg(msg, SOL_SOCKET, SO_MARK, sizeof(__u32), &mark);
1008	}
1009	}
1010
1011	void __sock_recv_cmsgs(struct msghdr msg, struct sock sk,
1012	struct sk_buff *skb)
1013	{
1014	sock_recv_timestamp(msg, sk, skb);
1015	sock_recv_drops(msg, sk, skb);
1016	sock_recv_mark(msg, sk, skb);
1017	}
1018	EXPORT_SYMBOL_GPL(__sock_recv_cmsgs);
1019
1020	INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket , struct msghdr ,
1021	size_t, int));
1022	INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket , struct msghdr ,
1023	size_t, int));
1024
1025	static noinline void call_trace_sock_recv_length(struct sock *sk, int ret, int flags)
1026	{
1027	trace_sock_recv_length(sk, ret, flags);
1028	}
1029
1030	static inline int sock_recvmsg_nosec(struct socket sock, struct msghdr msg,
1031	int flags)
1032	{
1033	int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->recvmsg,
1034	inet6_recvmsg,
1035	inet_recvmsg, sock, msg,
1036	msg_data_left(msg), flags);
1037	if (trace_sock_recv_length_enabled())
1038	call_trace_sock_recv_length(sock->sk, ret, flags);
1039	return ret;
1040	}
1041
1042	/**
1043	* sock_recvmsg - receive a message from @sock
1044	* @sock: socket
1045	* @msg: message to receive
1046	* @flags: message flags
1047	*
1048	* Receives @msg from @sock, passing through LSM. Returns the total number
1049	* of bytes received, or an error.
1050	*/
1051	int sock_recvmsg(struct socket sock, struct msghdr msg, int flags)
1052	{
1053	int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
1054
1055	return err ?: sock_recvmsg_nosec(sock, msg, flags);
1056	}
1057	EXPORT_SYMBOL(sock_recvmsg);
1058
1059	/**
1060	* kernel_recvmsg - Receive a message from a socket (kernel space)
1061	* @sock: The socket to receive the message from
1062	* @msg: Received message
1063	* @vec: Input s/g array for message data
1064	* @num: Size of input s/g array
1065	* @size: Number of bytes to read
1066	* @flags: Message flags (MSG_DONTWAIT, etc...)
1067	*
1068	* On return the msg structure contains the scatter/gather array passed in the
1069	* vec argument. The array is modified so that it consists of the unfilled
1070	* portion of the original array.
1071	*
1072	* The returned value is the total number of bytes received, or an error.
1073	*/
1074
1075	int kernel_recvmsg(struct socket sock, struct msghdr msg,
1076	struct kvec *vec, size_t num, size_t size, int flags)
1077	{
1078	msg->msg_control_is_user = false;
1079	iov_iter_kvec(&msg->msg_iter, ITER_DEST, vec, num, size);
1080	return sock_recvmsg(sock, msg, flags);
1081	}
1082	EXPORT_SYMBOL(kernel_recvmsg);
1083
1084	static ssize_t sock_splice_read(struct file file, loff_t ppos,
1085	struct pipe_inode_info *pipe, size_t len,
1086	unsigned int flags)
1087	{
1088	struct socket *sock = file->private_data;
1089	const struct proto_ops *ops;
1090
1091	ops = READ_ONCE(sock->ops);
1092	if (unlikely(!ops->splice_read))
1093	return copy_splice_read(file, ppos, pipe, len, flags);
1094
1095	return ops->splice_read(sock, ppos, pipe, len, flags);
1096	}
1097
1098	static void sock_splice_eof(struct file *file)
1099	{
1100	struct socket *sock = file->private_data;
1101	const struct proto_ops *ops;
1102
1103	ops = READ_ONCE(sock->ops);
1104	if (ops->splice_eof)
1105	ops->splice_eof(sock);
1106	}
1107
1108	static ssize_t sock_read_iter(struct kiocb iocb, struct iov_iter to)
1109	{
1110	struct file *file = iocb->ki_filp;
1111	struct socket *sock = file->private_data;
1112	struct msghdr msg = {.msg_iter = *to,
1113	.msg_iocb = iocb};
1114	ssize_t res;
1115
1116	if (file->f_flags & O_NONBLOCK \|\| (iocb->ki_flags & IOCB_NOWAIT))
1117	msg.msg_flags = MSG_DONTWAIT;
1118
1119	if (iocb->ki_pos != 0)
1120	return -ESPIPE;
1121
1122	if (!iov_iter_count(to)) /* Match SYS5 behaviour */
1123	return 0;
1124
1125	res = sock_recvmsg(sock, &msg, msg.msg_flags);
1126	*to = msg.msg_iter;
1127	return res;
1128	}
1129
1130	static ssize_t sock_write_iter(struct kiocb iocb, struct iov_iter from)
1131	{
1132	struct file *file = iocb->ki_filp;
1133	struct socket *sock = file->private_data;
1134	struct msghdr msg = {.msg_iter = *from,
1135	.msg_iocb = iocb};
1136	ssize_t res;
1137
1138	if (iocb->ki_pos != 0)
1139	return -ESPIPE;
1140
1141	if (file->f_flags & O_NONBLOCK \|\| (iocb->ki_flags & IOCB_NOWAIT))
1142	msg.msg_flags = MSG_DONTWAIT;
1143
1144	if (sock->type == SOCK_SEQPACKET)
1145	msg.msg_flags \|= MSG_EOR;
1146
1147	res = __sock_sendmsg(sock, &msg);
1148	*from = msg.msg_iter;
1149	return res;
1150	}
1151
1152	/*
1153	* Atomic setting of ioctl hooks to avoid race
1154	* with module unload.
1155	*/
1156
1157	static DEFINE_MUTEX(br_ioctl_mutex);
1158	static int (br_ioctl_hook)(struct net net, struct net_bridge *br,
1159	unsigned int cmd, struct ifreq *ifr,
1160	void __user *uarg);
1161
1162	void brioctl_set(int (hook)(struct net net, struct net_bridge *br,
1163	unsigned int cmd, struct ifreq *ifr,
1164	void __user *uarg))
1165	{
1166	mutex_lock(&br_ioctl_mutex);
1167	br_ioctl_hook = hook;
1168	mutex_unlock(&br_ioctl_mutex);
1169	}
1170	EXPORT_SYMBOL(brioctl_set);
1171
1172	int br_ioctl_call(struct net net, struct net_bridge br, unsigned int cmd,
1173	struct ifreq ifr, void __user uarg)
1174	{
1175	int err = -ENOPKG;
1176
1177	if (!br_ioctl_hook)
1178	request_module("bridge");
1179
1180	mutex_lock(&br_ioctl_mutex);
1181	if (br_ioctl_hook)
1182	err = br_ioctl_hook(net, br, cmd, ifr, uarg);
1183	mutex_unlock(&br_ioctl_mutex);
1184
1185	return err;
1186	}
1187
1188	static DEFINE_MUTEX(vlan_ioctl_mutex);
1189	static int (vlan_ioctl_hook) (struct net , void __user *arg);
1190
1191	void vlan_ioctl_set(int (hook) (struct net , void __user *))
1192	{
1193	mutex_lock(&vlan_ioctl_mutex);
1194	vlan_ioctl_hook = hook;
1195	mutex_unlock(&vlan_ioctl_mutex);
1196	}
1197	EXPORT_SYMBOL(vlan_ioctl_set);
1198
1199	static long sock_do_ioctl(struct net net, struct socket sock,
1200	unsigned int cmd, unsigned long arg)
1201	{
1202	const struct proto_ops *ops = READ_ONCE(sock->ops);
1203	struct ifreq ifr;
1204	bool need_copyout;
1205	int err;
1206	void __user argp = (void __user )arg;
1207	void __user *data;
1208
1209	err = ops->ioctl(sock, cmd, arg);
1210
1211	/*
1212	* If this ioctl is unknown try to hand it down
1213	* to the NIC driver.
1214	*/
1215	if (err != -ENOIOCTLCMD)
1216	return err;
1217
1218	if (!is_socket_ioctl_cmd(cmd))
1219	return -ENOTTY;
1220
1221	if (get_user_ifreq(&ifr, &data, argp))
1222	return -EFAULT;
1223	err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
1224	if (!err && need_copyout)
1225	if (put_user_ifreq(&ifr, argp))
1226	return -EFAULT;
1227
1228	return err;
1229	}
1230
1231	/*
1232	* With an ioctl, arg may well be a user mode pointer, but we don't know
1233	* what to do with it - that's up to the protocol still.
1234	*/
1235
1236	static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1237	{
1238	const struct proto_ops *ops;
1239	struct socket *sock;
1240	struct sock *sk;
1241	void __user argp = (void __user )arg;
1242	int pid, err;
1243	struct net *net;
1244
1245	sock = file->private_data;
1246	ops = READ_ONCE(sock->ops);
1247	sk = sock->sk;
1248	net = sock_net(sk);
1249	if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1250	struct ifreq ifr;
1251	void __user *data;
1252	bool need_copyout;
1253	if (get_user_ifreq(&ifr, &data, argp))
1254	return -EFAULT;
1255	err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
1256	if (!err && need_copyout)
1257	if (put_user_ifreq(&ifr, argp))
1258	return -EFAULT;
1259	} else
1260	#ifdef CONFIG_WEXT_CORE
1261	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1262	err = wext_handle_ioctl(net, cmd, argp);
1263	} else
1264	#endif
1265	switch (cmd) {
1266	case FIOSETOWN:
1267	case SIOCSPGRP:
1268	err = -EFAULT;
1269	if (get_user(pid, (int __user *)argp))
1270	break;
1271	err = f_setown(sock->file, pid, 1);
1272	break;
1273	case FIOGETOWN:
1274	case SIOCGPGRP:
1275	err = put_user(f_getown(sock->file),
1276	(int __user *)argp);
1277	break;
1278	case SIOCGIFBR:
1279	case SIOCSIFBR:
1280	case SIOCBRADDBR:
1281	case SIOCBRDELBR:
1282	err = br_ioctl_call(net, NULL, cmd, NULL, argp);
1283	break;
1284	case SIOCGIFVLAN:
1285	case SIOCSIFVLAN:
1286	err = -ENOPKG;
1287	if (!vlan_ioctl_hook)
1288	request_module("8021q");
1289
1290	mutex_lock(&vlan_ioctl_mutex);
1291	if (vlan_ioctl_hook)
1292	err = vlan_ioctl_hook(net, argp);
1293	mutex_unlock(&vlan_ioctl_mutex);
1294	break;
1295	case SIOCGSKNS:
1296	err = -EPERM;
1297	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1298	break;
1299
1300	err = open_related_ns(&net->ns, get_net_ns);
1301	break;
1302	case SIOCGSTAMP_OLD:
1303	case SIOCGSTAMPNS_OLD:
1304	if (!ops->gettstamp) {
1305	err = -ENOIOCTLCMD;
1306	break;
1307	}
1308	err = ops->gettstamp(sock, argp,
1309	cmd == SIOCGSTAMP_OLD,
1310	!IS_ENABLED(CONFIG_64BIT));
1311	break;
1312	case SIOCGSTAMP_NEW:
1313	case SIOCGSTAMPNS_NEW:
1314	if (!ops->gettstamp) {
1315	err = -ENOIOCTLCMD;
1316	break;
1317	}
1318	err = ops->gettstamp(sock, argp,
1319	cmd == SIOCGSTAMP_NEW,
1320	false);
1321	break;
1322
1323	case SIOCGIFCONF:
1324	err = dev_ifconf(net, argp);
1325	break;
1326
1327	default:
1328	err = sock_do_ioctl(net, sock, cmd, arg);
1329	break;
1330	}
1331	return err;
1332	}
1333
1334	/**
1335	* sock_create_lite - creates a socket
1336	* @family: protocol family (AF_INET, ...)
1337	* @type: communication type (SOCK_STREAM, ...)
1338	* @protocol: protocol (0, ...)
1339	* @res: new socket
1340	*
1341	* Creates a new socket and assigns it to @res, passing through LSM.
1342	* The new socket initialization is not complete, see kernel_accept().
1343	* Returns 0 or an error. On failure @res is set to %NULL.
1344	* This function internally uses GFP_KERNEL.
1345	*/
1346
1347	int sock_create_lite(int family, int type, int protocol, struct socket **res)
1348	{
1349	int err;
1350	struct socket *sock = NULL;
1351
1352	err = security_socket_create(family, type, protocol, 1);
1353	if (err)
1354	goto out;
1355
1356	sock = sock_alloc();
1357	if (!sock) {
1358	err = -ENOMEM;
1359	goto out;
1360	}
1361
1362	sock->type = type;
1363	err = security_socket_post_create(sock, family, type, protocol, 1);
1364	if (err)
1365	goto out_release;
1366
1367	out:
1368	*res = sock;
1369	return err;
1370	out_release:
1371	sock_release(sock);
1372	sock = NULL;
1373	goto out;
1374	}
1375	EXPORT_SYMBOL(sock_create_lite);
1376
1377	/* No kernel lock held - perfect */
1378	static __poll_t sock_poll(struct file file, poll_table wait)
1379	{
1380	struct socket *sock = file->private_data;
1381	const struct proto_ops *ops = READ_ONCE(sock->ops);
1382	__poll_t events = poll_requested_events(wait), flag = 0;
1383
1384	if (!ops->poll)
1385	return 0;
1386
1387	if (sk_can_busy_loop(sock->sk)) {
1388	/* poll once if requested by the syscall */
1389	if (events & POLL_BUSY_LOOP)
1390	sk_busy_loop(sock->sk, 1);
1391
1392	/* if this socket can poll_ll, tell the system call */
1393	flag = POLL_BUSY_LOOP;
1394	}
1395
1396	return ops->poll(file, sock, wait) \| flag;
1397	}
1398
1399	static int sock_mmap(struct file file, struct vm_area_struct vma)
1400	{
1401	struct socket *sock = file->private_data;
1402
1403	return READ_ONCE(sock->ops)->mmap(file, sock, vma);
1404	}
1405
1406	static int sock_close(struct inode inode, struct file filp)
1407	{
1408	__sock_release(SOCKET_I(inode), inode);
1409	return 0;
1410	}
1411
1412	/*
1413	* Update the socket async list
1414	*
1415	* Fasync_list locking strategy.
1416	*
1417	* 1. fasync_list is modified only under process context socket lock
1418	* i.e. under semaphore.
1419	* 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1420	* or under socket lock
1421	*/
1422
1423	static int sock_fasync(int fd, struct file *filp, int on)
1424	{
1425	struct socket *sock = filp->private_data;
1426	struct sock *sk = sock->sk;
1427	struct socket_wq *wq = &sock->wq;
1428
1429	if (sk == NULL)
1430	return -EINVAL;
1431
1432	lock_sock(sk);
1433	fasync_helper(fd, filp, on, &wq->fasync_list);
1434
1435	if (!wq->fasync_list)
1436	sock_reset_flag(sk, SOCK_FASYNC);
1437	else
1438	sock_set_flag(sk, SOCK_FASYNC);
1439
1440	release_sock(sk);
1441	return 0;
1442	}
1443
1444	/* This function may be called only under rcu_lock */
1445
1446	int sock_wake_async(struct socket_wq *wq, int how, int band)
1447	{
1448	if (!wq \|\| !wq->fasync_list)
1449	return -1;
1450
1451	switch (how) {
1452	case SOCK_WAKE_WAITD:
1453	if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
1454	break;
1455	goto call_kill;
1456	case SOCK_WAKE_SPACE:
1457	if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
1458	break;
1459	fallthrough;
1460	case SOCK_WAKE_IO:
1461	call_kill:
1462	kill_fasync(&wq->fasync_list, SIGIO, band);
1463	break;
1464	case SOCK_WAKE_URG:
1465	kill_fasync(&wq->fasync_list, SIGURG, band);
1466	}
1467
1468	return 0;
1469	}
1470	EXPORT_SYMBOL(sock_wake_async);
1471
1472	/**
1473	* __sock_create - creates a socket
1474	* @net: net namespace
1475	* @family: protocol family (AF_INET, ...)
1476	* @type: communication type (SOCK_STREAM, ...)
1477	* @protocol: protocol (0, ...)
1478	* @res: new socket
1479	* @kern: boolean for kernel space sockets
1480	*
1481	* Creates a new socket and assigns it to @res, passing through LSM.
1482	* Returns 0 or an error. On failure @res is set to %NULL. @kern must
1483	* be set to true if the socket resides in kernel space.
1484	* This function internally uses GFP_KERNEL.
1485	*/
1486
1487	int __sock_create(struct net *net, int family, int type, int protocol,
1488	struct socket **res, int kern)
1489	{
1490	int err;
1491	struct socket *sock;
1492	const struct net_proto_family *pf;
1493
1494	/*
1495	* Check protocol is in range
1496	*/
1497	if (family < 0 \|\| family >= NPROTO)
1498	return -EAFNOSUPPORT;
1499	if (type < 0 \|\| type >= SOCK_MAX)
1500	return -EINVAL;
1501
1502	/* Compatibility.
1503
1504	This uglymoron is moved from INET layer to here to avoid
1505	deadlock in module load.
1506	*/
1507	if (family == PF_INET && type == SOCK_PACKET) {
1508	pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1509	current->comm);
1510	family = PF_PACKET;
1511	}
1512
1513	err = security_socket_create(family, type, protocol, kern);
1514	if (err)
1515	return err;
1516
1517	/*
1518	* Allocate the socket and allow the family to set things up. if
1519	* the protocol is 0, the family is instructed to select an appropriate
1520	* default.
1521	*/
1522	sock = sock_alloc();
1523	if (!sock) {
1524	net_warn_ratelimited("socket: no more sockets\n");
1525	return -ENFILE; /* Not exactly a match, but its the
1526	closest posix thing */
1527	}
1528
1529	sock->type = type;
1530
1531	#ifdef CONFIG_MODULES
1532	/* Attempt to load a protocol module if the find failed.
1533	*
1534	* 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1535	* requested real, full-featured networking support upon configuration.
1536	* Otherwise module support will break!
1537	*/
1538	if (rcu_access_pointer(net_families[family]) == NULL)
1539	request_module("net-pf-%d", family);
1540	#endif
1541
1542	rcu_read_lock();
1543	pf = rcu_dereference(net_families[family]);
1544	err = -EAFNOSUPPORT;
1545	if (!pf)
1546	goto out_release;
1547
1548	/*
1549	* We will call the ->create function, that possibly is in a loadable
1550	* module, so we have to bump that loadable module refcnt first.
1551	*/
1552	if (!try_module_get(pf->owner))
1553	goto out_release;
1554
1555	/* Now protected by module ref count */
1556	rcu_read_unlock();
1557
1558	err = pf->create(net, sock, protocol, kern);
1559	if (err < 0) {
1560	/* ->create should release the allocated sock->sk object on error
1561	* and make sure sock->sk is set to NULL to avoid use-after-free
1562	*/
1563	DEBUG_NET_WARN_ONCE(sock->sk,
1564	"%ps must clear sock->sk on failure, family: %d, type: %d, protocol: %d\n",
1565	pf->create, family, type, protocol);
1566	goto out_module_put;
1567	}
1568
1569	/*
1570	* Now to bump the refcnt of the [loadable] module that owns this
1571	* socket at sock_release time we decrement its refcnt.
1572	*/
1573	if (!try_module_get(sock->ops->owner))
1574	goto out_module_busy;
1575
1576	/*
1577	* Now that we're done with the ->create function, the [loadable]
1578	* module can have its refcnt decremented
1579	*/
1580	module_put(pf->owner);
1581	err = security_socket_post_create(sock, family, type, protocol, kern);
1582	if (err)
1583	goto out_sock_release;
1584	*res = sock;
1585
1586	return 0;
1587
1588	out_module_busy:
1589	err = -EAFNOSUPPORT;
1590	out_module_put:
1591	sock->ops = NULL;
1592	module_put(pf->owner);
1593	out_sock_release:
1594	sock_release(sock);
1595	return err;
1596
1597	out_release:
1598	rcu_read_unlock();
1599	goto out_sock_release;
1600	}
1601	EXPORT_SYMBOL(__sock_create);
1602
1603	/**
1604	* sock_create - creates a socket
1605	* @family: protocol family (AF_INET, ...)
1606	* @type: communication type (SOCK_STREAM, ...)
1607	* @protocol: protocol (0, ...)
1608	* @res: new socket
1609	*
1610	* A wrapper around __sock_create().
1611	* Returns 0 or an error. This function internally uses GFP_KERNEL.
1612	*/
1613
1614	int sock_create(int family, int type, int protocol, struct socket **res)
1615	{
1616	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1617	}
1618	EXPORT_SYMBOL(sock_create);
1619
1620	/**
1621	* sock_create_kern - creates a socket (kernel space)
1622	* @net: net namespace
1623	* @family: protocol family (AF_INET, ...)
1624	* @type: communication type (SOCK_STREAM, ...)
1625	* @protocol: protocol (0, ...)
1626	* @res: new socket
1627	*
1628	* A wrapper around __sock_create().
1629	* Returns 0 or an error. This function internally uses GFP_KERNEL.
1630	*/
1631
1632	int sock_create_kern(struct net net, int family, int type, int protocol, struct socket *res)
1633	{
1634	return __sock_create(net, family, type, protocol, res, 1);
1635	}
1636	EXPORT_SYMBOL(sock_create_kern);
1637
1638	static struct socket *__sys_socket_create(int family, int type, int protocol)
1639	{
1640	struct socket *sock;
1641	int retval;
1642
1643	/* Check the SOCK_* constants for consistency. */
1644	BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1645	BUILD_BUG_ON((SOCK_MAX \| SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1646	BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1647	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1648
1649	if ((type & ~SOCK_TYPE_MASK) & ~(SOCK_CLOEXEC \| SOCK_NONBLOCK))
1650	return ERR_PTR(-EINVAL);
1651	type &= SOCK_TYPE_MASK;
1652
1653	retval = sock_create(family, type, protocol, &sock);
1654	if (retval < 0)
1655	return ERR_PTR(retval);
1656
1657	return sock;
1658	}
1659
1660	struct file *__sys_socket_file(int family, int type, int protocol)
1661	{
1662	struct socket *sock;
1663	int flags;
1664
1665	sock = __sys_socket_create(family, type, protocol);
1666	if (IS_ERR(sock))
1667	return ERR_CAST(sock);
1668
1669	flags = type & ~SOCK_TYPE_MASK;
1670	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1671	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1672
1673	return sock_alloc_file(sock, flags, NULL);
1674	}
1675
1676	/* A hook for bpf progs to attach to and update socket protocol.
1677	*
1678	* A static noinline declaration here could cause the compiler to
1679	* optimize away the function. A global noinline declaration will
1680	* keep the definition, but may optimize away the callsite.
1681	* Therefore, __weak is needed to ensure that the call is still
1682	* emitted, by telling the compiler that we don't know what the
1683	* function might eventually be.
1684	*/
1685
1686	__bpf_hook_start();
1687
1688	__weak noinline int update_socket_protocol(int family, int type, int protocol)
1689	{
1690	return protocol;
1691	}
1692
1693	__bpf_hook_end();
1694
1695	int __sys_socket(int family, int type, int protocol)
1696	{
1697	struct socket *sock;
1698	int flags;
1699
1700	sock = __sys_socket_create(family, type,
1701	update_socket_protocol(family, type, protocol));
1702	if (IS_ERR(sock))
1703	return PTR_ERR(sock);
1704
1705	flags = type & ~SOCK_TYPE_MASK;
1706	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1707	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1708
1709	return sock_map_fd(sock, flags & (O_CLOEXEC \| O_NONBLOCK));
1710	}
1711
1712	SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1713	{
1714	return __sys_socket(family, type, protocol);
1715	}
1716
1717	/*
1718	* Create a pair of connected sockets.
1719	*/
1720
1721	int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
1722	{
1723	struct socket sock1, sock2;
1724	int fd1, fd2, err;
1725	struct file newfile1, newfile2;
1726	int flags;
1727
1728	flags = type & ~SOCK_TYPE_MASK;
1729	if (flags & ~(SOCK_CLOEXEC \| SOCK_NONBLOCK))
1730	return -EINVAL;
1731	type &= SOCK_TYPE_MASK;
1732
1733	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1734	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1735
1736	/*
1737	* reserve descriptors and make sure we won't fail
1738	* to return them to userland.
1739	*/
1740	fd1 = get_unused_fd_flags(flags);
1741	if (unlikely(fd1 < 0))
1742	return fd1;
1743
1744	fd2 = get_unused_fd_flags(flags);
1745	if (unlikely(fd2 < 0)) {
1746	put_unused_fd(fd1);
1747	return fd2;
1748	}
1749
1750	err = put_user(fd1, &usockvec[0]);
1751	if (err)
1752	goto out;
1753
1754	err = put_user(fd2, &usockvec[1]);
1755	if (err)
1756	goto out;
1757
1758	/*
1759	* Obtain the first socket and check if the underlying protocol
1760	* supports the socketpair call.
1761	*/
1762
1763	err = sock_create(family, type, protocol, &sock1);
1764	if (unlikely(err < 0))
1765	goto out;
1766
1767	err = sock_create(family, type, protocol, &sock2);
1768	if (unlikely(err < 0)) {
1769	sock_release(sock1);
1770	goto out;
1771	}
1772
1773	err = security_socket_socketpair(sock1, sock2);
1774	if (unlikely(err)) {
1775	sock_release(sock2);
1776	sock_release(sock1);
1777	goto out;
1778	}
1779
1780	err = READ_ONCE(sock1->ops)->socketpair(sock1, sock2);
1781	if (unlikely(err < 0)) {
1782	sock_release(sock2);
1783	sock_release(sock1);
1784	goto out;
1785	}
1786
1787	newfile1 = sock_alloc_file(sock1, flags, NULL);
1788	if (IS_ERR(newfile1)) {
1789	err = PTR_ERR(newfile1);
1790	sock_release(sock2);
1791	goto out;
1792	}
1793
1794	newfile2 = sock_alloc_file(sock2, flags, NULL);
1795	if (IS_ERR(newfile2)) {
1796	err = PTR_ERR(newfile2);
1797	fput(newfile1);
1798	goto out;
1799	}
1800
1801	audit_fd_pair(fd1, fd2);
1802
1803	fd_install(fd1, newfile1);
1804	fd_install(fd2, newfile2);
1805	return 0;
1806
1807	out:
1808	put_unused_fd(fd2);
1809	put_unused_fd(fd1);
1810	return err;
1811	}
1812
1813	SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1814	int __user *, usockvec)
1815	{
1816	return __sys_socketpair(family, type, protocol, usockvec);
1817	}
1818
1819	int __sys_bind_socket(struct socket sock, struct sockaddr_storage address,
1820	int addrlen)
1821	{
1822	int err;
1823
1824	err = security_socket_bind(sock, (struct sockaddr *)address,
1825	addrlen);
1826	if (!err)
1827	err = READ_ONCE(sock->ops)->bind(sock,
1828	(struct sockaddr *)address,
1829	addrlen);
1830	return err;
1831	}
1832
1833	/*
1834	* Bind a name to a socket. Nothing much to do here since it's
1835	* the protocol's responsibility to handle the local address.
1836	*
1837	* We move the socket address to kernel space before we call
1838	* the protocol layer (having also checked the address is ok).
1839	*/
1840
1841	int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1842	{
1843	struct socket *sock;
1844	struct sockaddr_storage address;
1845	CLASS(fd, f)(fd);
1846	int err;
1847
1848	if (fd_empty(f))
1849	return -EBADF;
1850	sock = sock_from_file(fd_file(f));
1851	if (unlikely(!sock))
1852	return -ENOTSOCK;
1853
1854	err = move_addr_to_kernel(umyaddr, addrlen, &address);
1855	if (unlikely(err))
1856	return err;
1857
1858	return __sys_bind_socket(sock, &address, addrlen);
1859	}
1860
1861	SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1862	{
1863	return __sys_bind(fd, umyaddr, addrlen);
1864	}
1865
1866	/*
1867	* Perform a listen. Basically, we allow the protocol to do anything
1868	* necessary for a listen, and if that works, we mark the socket as
1869	* ready for listening.
1870	*/
1871	int __sys_listen_socket(struct socket *sock, int backlog)
1872	{
1873	int somaxconn, err;
1874
1875	somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn);
1876	if ((unsigned int)backlog > somaxconn)
1877	backlog = somaxconn;
1878
1879	err = security_socket_listen(sock, backlog);
1880	if (!err)
1881	err = READ_ONCE(sock->ops)->listen(sock, backlog);
1882	return err;
1883	}
1884
1885	int __sys_listen(int fd, int backlog)
1886	{
1887	CLASS(fd, f)(fd);
1888	struct socket *sock;
1889
1890	if (fd_empty(f))
1891	return -EBADF;
1892	sock = sock_from_file(fd_file(f));
1893	if (unlikely(!sock))
1894	return -ENOTSOCK;
1895
1896	return __sys_listen_socket(sock, backlog);
1897	}
1898
1899	SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1900	{
1901	return __sys_listen(fd, backlog);
1902	}
1903
1904	struct file do_accept(struct file file, struct proto_accept_arg *arg,
1905	struct sockaddr __user *upeer_sockaddr,
1906	int __user *upeer_addrlen, int flags)
1907	{
1908	struct socket sock, newsock;
1909	struct file *newfile;
1910	int err, len;
1911	struct sockaddr_storage address;
1912	const struct proto_ops *ops;
1913
1914	sock = sock_from_file(file);
1915	if (!sock)
1916	return ERR_PTR(-ENOTSOCK);
1917
1918	newsock = sock_alloc();
1919	if (!newsock)
1920	return ERR_PTR(-ENFILE);
1921	ops = READ_ONCE(sock->ops);
1922
1923	newsock->type = sock->type;
1924	newsock->ops = ops;
1925
1926	/*
1927	* We don't need try_module_get here, as the listening socket (sock)
1928	* has the protocol module (sock->ops->owner) held.
1929	*/
1930	__module_get(ops->owner);
1931
1932	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1933	if (IS_ERR(newfile))
1934	return newfile;
1935
1936	err = security_socket_accept(sock, newsock);
1937	if (err)
1938	goto out_fd;
1939
1940	arg->flags \|= sock->file->f_flags;
1941	err = ops->accept(sock, newsock, arg);
1942	if (err < 0)
1943	goto out_fd;
1944
1945	if (upeer_sockaddr) {
1946	len = ops->getname(newsock, (struct sockaddr *)&address, 2);
1947	if (len < 0) {
1948	err = -ECONNABORTED;
1949	goto out_fd;
1950	}
1951	err = move_addr_to_user(&address,
1952	len, upeer_sockaddr, upeer_addrlen);
1953	if (err < 0)
1954	goto out_fd;
1955	}
1956
1957	/* File flags are not inherited via accept() unlike another OSes. */
1958	return newfile;
1959	out_fd:
1960	fput(newfile);
1961	return ERR_PTR(err);
1962	}
1963
1964	static int __sys_accept4_file(struct file file, struct sockaddr __user upeer_sockaddr,
1965	int __user *upeer_addrlen, int flags)
1966	{
1967	struct proto_accept_arg arg = { };
1968	struct file *newfile;
1969	int newfd;
1970
1971	if (flags & ~(SOCK_CLOEXEC \| SOCK_NONBLOCK))
1972	return -EINVAL;
1973
1974	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1975	flags = (flags & ~SOCK_NONBLOCK) \| O_NONBLOCK;
1976
1977	newfd = get_unused_fd_flags(flags);
1978	if (unlikely(newfd < 0))
1979	return newfd;
1980
1981	newfile = do_accept(file, &arg, upeer_sockaddr, upeer_addrlen,
1982	flags);
1983	if (IS_ERR(newfile)) {
1984	put_unused_fd(newfd);
1985	return PTR_ERR(newfile);
1986	}
1987	fd_install(newfd, newfile);
1988	return newfd;
1989	}
1990
1991	/*
1992	* For accept, we attempt to create a new socket, set up the link
1993	* with the client, wake up the client, then return the new
1994	* connected fd. We collect the address of the connector in kernel
1995	* space and move it to user at the very end. This is unclean because
1996	* we open the socket then return an error.
1997	*
1998	* 1003.1g adds the ability to recvmsg() to query connection pending
1999	* status to recvmsg. We need to add that support in a way thats
2000	* clean when we restructure accept also.
2001	*/
2002
2003	int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
2004	int __user *upeer_addrlen, int flags)
2005	{
2006	CLASS(fd, f)(fd);
2007
2008	if (fd_empty(f))
2009	return -EBADF;
2010	return __sys_accept4_file(fd_file(f), upeer_sockaddr,
2011	upeer_addrlen, flags);
2012	}
2013
2014	SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
2015	int __user *, upeer_addrlen, int, flags)
2016	{
2017	return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
2018	}
2019
2020	SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
2021	int __user *, upeer_addrlen)
2022	{
2023	return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
2024	}
2025
2026	/*
2027	* Attempt to connect to a socket with the server address. The address
2028	* is in user space so we verify it is OK and move it to kernel space.
2029	*
2030	* For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
2031	* break bindings
2032	*
2033	* NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
2034	* other SEQPACKET protocols that take time to connect() as it doesn't
2035	* include the -EINPROGRESS status for such sockets.
2036	*/
2037
2038	int __sys_connect_file(struct file file, struct sockaddr_storage address,
2039	int addrlen, int file_flags)
2040	{
2041	struct socket *sock;
2042	int err;
2043
2044	sock = sock_from_file(file);
2045	if (!sock) {
2046	err = -ENOTSOCK;
2047	goto out;
2048	}
2049
2050	err =
2051	security_socket_connect(sock, (struct sockaddr *)address, addrlen);
2052	if (err)
2053	goto out;
2054
2055	err = READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)address,
2056	addrlen, sock->file->f_flags \| file_flags);
2057	out:
2058	return err;
2059	}
2060
2061	int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
2062	{
2063	struct sockaddr_storage address;
2064	CLASS(fd, f)(fd);
2065	int ret;
2066
2067	if (fd_empty(f))
2068	return -EBADF;
2069
2070	ret = move_addr_to_kernel(uservaddr, addrlen, &address);
2071	if (ret)
2072	return ret;
2073
2074	return __sys_connect_file(fd_file(f), &address, addrlen, 0);
2075	}
2076
2077	SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
2078	int, addrlen)
2079	{
2080	return __sys_connect(fd, uservaddr, addrlen);
2081	}
2082
2083	/*
2084	* Get the local address ('name') of a socket object. Move the obtained
2085	* name to user space.
2086	*/
2087
2088	int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
2089	int __user *usockaddr_len)
2090	{
2091	struct socket *sock;
2092	struct sockaddr_storage address;
2093	CLASS(fd, f)(fd);
2094	int err;
2095
2096	if (fd_empty(f))
2097	return -EBADF;
2098	sock = sock_from_file(fd_file(f));
2099	if (unlikely(!sock))
2100	return -ENOTSOCK;
2101
2102	err = security_socket_getsockname(sock);
2103	if (err)
2104	return err;
2105
2106	err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 0);
2107	if (err < 0)
2108	return err;
2109
2110	/* "err" is actually length in this case */
2111	return move_addr_to_user(&address, err, usockaddr, usockaddr_len);
2112	}
2113
2114	SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
2115	int __user *, usockaddr_len)
2116	{
2117	return __sys_getsockname(fd, usockaddr, usockaddr_len);
2118	}
2119
2120	/*
2121	* Get the remote address ('name') of a socket object. Move the obtained
2122	* name to user space.
2123	*/
2124
2125	int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
2126	int __user *usockaddr_len)
2127	{
2128	struct socket *sock;
2129	struct sockaddr_storage address;
2130	CLASS(fd, f)(fd);
2131	int err;
2132
2133	if (fd_empty(f))
2134	return -EBADF;
2135	sock = sock_from_file(fd_file(f));
2136	if (unlikely(!sock))
2137	return -ENOTSOCK;
2138
2139	err = security_socket_getpeername(sock);
2140	if (err)
2141	return err;
2142
2143	err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 1);
2144	if (err < 0)
2145	return err;
2146
2147	/* "err" is actually length in this case */
2148	return move_addr_to_user(&address, err, usockaddr, usockaddr_len);
2149	}
2150
2151	SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
2152	int __user *, usockaddr_len)
2153	{
2154	return __sys_getpeername(fd, usockaddr, usockaddr_len);
2155	}
2156
2157	/*
2158	* Send a datagram to a given address. We move the address into kernel
2159	* space and check the user space data area is readable before invoking
2160	* the protocol.
2161	*/
2162	int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
2163	struct sockaddr __user *addr, int addr_len)
2164	{
2165	struct socket *sock;
2166	struct sockaddr_storage address;
2167	int err;
2168	struct msghdr msg;
2169
2170	err = import_ubuf(ITER_SOURCE, buff, len, &msg.msg_iter);
2171	if (unlikely(err))
2172	return err;
2173
2174	CLASS(fd, f)(fd);
2175	if (fd_empty(f))
2176	return -EBADF;
2177	sock = sock_from_file(fd_file(f));
2178	if (unlikely(!sock))
2179	return -ENOTSOCK;
2180
2181	msg.msg_name = NULL;
2182	msg.msg_control = NULL;
2183	msg.msg_controllen = 0;
2184	msg.msg_namelen = 0;
2185	msg.msg_ubuf = NULL;
2186	if (addr) {
2187	err = move_addr_to_kernel(addr, addr_len, &address);
2188	if (err < 0)
2189	return err;
2190	msg.msg_name = (struct sockaddr *)&address;
2191	msg.msg_namelen = addr_len;
2192	}
2193	flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
2194	if (sock->file->f_flags & O_NONBLOCK)
2195	flags \|= MSG_DONTWAIT;
2196	msg.msg_flags = flags;
2197	return __sock_sendmsg(sock, &msg);
2198	}
2199
2200	SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
2201	unsigned int, flags, struct sockaddr __user *, addr,
2202	int, addr_len)
2203	{
2204	return __sys_sendto(fd, buff, len, flags, addr, addr_len);
2205	}
2206
2207	/*
2208	* Send a datagram down a socket.
2209	*/
2210
2211	SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
2212	unsigned int, flags)
2213	{
2214	return __sys_sendto(fd, buff, len, flags, NULL, 0);
2215	}
2216
2217	/*
2218	* Receive a frame from the socket and optionally record the address of the
2219	* sender. We verify the buffers are writable and if needed move the
2220	* sender address from kernel to user space.
2221	*/
2222	int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2223	struct sockaddr __user addr, int __user addr_len)
2224	{
2225	struct sockaddr_storage address;
2226	struct msghdr msg = {
2227	/* Save some cycles and don't copy the address if not needed */
2228	.msg_name = addr ? (struct sockaddr *)&address : NULL,
2229	};
2230	struct socket *sock;
2231	int err, err2;
2232
2233	err = import_ubuf(ITER_DEST, ubuf, size, &msg.msg_iter);
2234	if (unlikely(err))
2235	return err;
2236
2237	CLASS(fd, f)(fd);
2238
2239	if (fd_empty(f))
2240	return -EBADF;
2241	sock = sock_from_file(fd_file(f));
2242	if (unlikely(!sock))
2243	return -ENOTSOCK;
2244
2245	if (sock->file->f_flags & O_NONBLOCK)
2246	flags \|= MSG_DONTWAIT;
2247	err = sock_recvmsg(sock, &msg, flags);
2248
2249	if (err >= 0 && addr != NULL) {
2250	err2 = move_addr_to_user(&address,
2251	msg.msg_namelen, addr, addr_len);
2252	if (err2 < 0)
2253	err = err2;
2254	}
2255	return err;
2256	}
2257
2258	SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2259	unsigned int, flags, struct sockaddr __user *, addr,
2260	int __user *, addr_len)
2261	{
2262	return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2263	}
2264
2265	/*
2266	* Receive a datagram from a socket.
2267	*/
2268
2269	SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2270	unsigned int, flags)
2271	{
2272	return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
2273	}
2274
2275	static bool sock_use_custom_sol_socket(const struct socket *sock)
2276	{
2277	return test_bit(SOCK_CUSTOM_SOCKOPT, &sock->flags);
2278	}
2279
2280	int do_sock_setsockopt(struct socket *sock, bool compat, int level,
2281	int optname, sockptr_t optval, int optlen)
2282	{
2283	const struct proto_ops *ops;
2284	char *kernel_optval = NULL;
2285	int err;
2286
2287	if (optlen < 0)
2288	return -EINVAL;
2289
2290	err = security_socket_setsockopt(sock, level, optname);
2291	if (err)
2292	goto out_put;
2293
2294	if (!compat)
2295	err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
2296	optval, &optlen,
2297	&kernel_optval);
2298	if (err < 0)
2299	goto out_put;
2300	if (err > 0) {
2301	err = 0;
2302	goto out_put;
2303	}
2304
2305	if (kernel_optval)
2306	optval = KERNEL_SOCKPTR(kernel_optval);
2307	ops = READ_ONCE(sock->ops);
2308	if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
2309	err = sock_setsockopt(sock, level, optname, optval, optlen);
2310	else if (unlikely(!ops->setsockopt))
2311	err = -EOPNOTSUPP;
2312	else
2313	err = ops->setsockopt(sock, level, optname, optval,
2314	optlen);
2315	kfree(kernel_optval);
2316	out_put:
2317	return err;
2318	}
2319	EXPORT_SYMBOL(do_sock_setsockopt);
2320
2321	/* Set a socket option. Because we don't know the option lengths we have
2322	* to pass the user mode parameter for the protocols to sort out.
2323	*/
2324	int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
2325	int optlen)
2326	{
2327	sockptr_t optval = USER_SOCKPTR(user_optval);
2328	bool compat = in_compat_syscall();
2329	struct socket *sock;
2330	CLASS(fd, f)(fd);
2331
2332	if (fd_empty(f))
2333	return -EBADF;
2334	sock = sock_from_file(fd_file(f));
2335	if (unlikely(!sock))
2336	return -ENOTSOCK;
2337
2338	return do_sock_setsockopt(sock, compat, level, optname, optval, optlen);
2339	}
2340
2341	SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2342	char __user *, optval, int, optlen)
2343	{
2344	return __sys_setsockopt(fd, level, optname, optval, optlen);
2345	}
2346
2347	INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
2348	int optname));
2349
2350	int do_sock_getsockopt(struct socket *sock, bool compat, int level,
2351	int optname, sockptr_t optval, sockptr_t optlen)
2352	{
2353	int max_optlen __maybe_unused = 0;
2354	const struct proto_ops *ops;
2355	int err;
2356
2357	err = security_socket_getsockopt(sock, level, optname);
2358	if (err)
2359	return err;
2360
2361	if (!compat)
2362	copy_from_sockptr(&max_optlen, optlen, sizeof(int));
2363
2364	ops = READ_ONCE(sock->ops);
2365	if (level == SOL_SOCKET) {
2366	err = sk_getsockopt(sock->sk, level, optname, optval, optlen);
2367	} else if (unlikely(!ops->getsockopt)) {
2368	err = -EOPNOTSUPP;
2369	} else {
2370	if (WARN_ONCE(optval.is_kernel \|\| optlen.is_kernel,
2371	"Invalid argument type"))
2372	return -EOPNOTSUPP;
2373
2374	err = ops->getsockopt(sock, level, optname, optval.user,
2375	optlen.user);
2376	}
2377
2378	if (!compat)
2379	err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2380	optval, optlen, max_optlen,
2381	err);
2382
2383	return err;
2384	}
2385	EXPORT_SYMBOL(do_sock_getsockopt);
2386
2387	/*
2388	* Get a socket option. Because we don't know the option lengths we have
2389	* to pass a user mode parameter for the protocols to sort out.
2390	*/
2391	int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
2392	int __user *optlen)
2393	{
2394	struct socket *sock;
2395	CLASS(fd, f)(fd);
2396
2397	if (fd_empty(f))
2398	return -EBADF;
2399	sock = sock_from_file(fd_file(f));
2400	if (unlikely(!sock))
2401	return -ENOTSOCK;
2402
2403	return do_sock_getsockopt(sock, in_compat_syscall(), level, optname,
2404	USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
2405	}
2406
2407	SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2408	char __user , optval, int __user , optlen)
2409	{
2410	return __sys_getsockopt(fd, level, optname, optval, optlen);
2411	}
2412
2413	/*
2414	* Shutdown a socket.
2415	*/
2416
2417	int __sys_shutdown_sock(struct socket *sock, int how)
2418	{
2419	int err;
2420
2421	err = security_socket_shutdown(sock, how);
2422	if (!err)
2423	err = READ_ONCE(sock->ops)->shutdown(sock, how);
2424
2425	return err;
2426	}
2427
2428	int __sys_shutdown(int fd, int how)
2429	{
2430	struct socket *sock;
2431	CLASS(fd, f)(fd);
2432
2433	if (fd_empty(f))
2434	return -EBADF;
2435	sock = sock_from_file(fd_file(f));
2436	if (unlikely(!sock))
2437	return -ENOTSOCK;
2438
2439	return __sys_shutdown_sock(sock, how);
2440	}
2441
2442	SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2443	{
2444	return __sys_shutdown(fd, how);
2445	}
2446
2447	/* A couple of helpful macros for getting the address of the 32/64 bit
2448	* fields which are the same type (int / unsigned) on our platforms.
2449	*/
2450	#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2451	#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2452	#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2453
2454	struct used_address {
2455	struct sockaddr_storage name;
2456	unsigned int name_len;
2457	};
2458
2459	int __copy_msghdr(struct msghdr *kmsg,
2460	struct user_msghdr *msg,
2461	struct sockaddr __user **save_addr)
2462	{
2463	ssize_t err;
2464
2465	kmsg->msg_control_is_user = true;
2466	kmsg->msg_get_inq = 0;
2467	kmsg->msg_control_user = msg->msg_control;
2468	kmsg->msg_controllen = msg->msg_controllen;
2469	kmsg->msg_flags = msg->msg_flags;
2470
2471	kmsg->msg_namelen = msg->msg_namelen;
2472	if (!msg->msg_name)
2473	kmsg->msg_namelen = 0;
2474
2475	if (kmsg->msg_namelen < 0)
2476	return -EINVAL;
2477
2478	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
2479	kmsg->msg_namelen = sizeof(struct sockaddr_storage);
2480
2481	if (save_addr)
2482	*save_addr = msg->msg_name;
2483
2484	if (msg->msg_name && kmsg->msg_namelen) {
2485	if (!save_addr) {
2486	err = move_addr_to_kernel(msg->msg_name,
2487	kmsg->msg_namelen,
2488	kmsg->msg_name);
2489	if (err < 0)
2490	return err;
2491	}
2492	} else {
2493	kmsg->msg_name = NULL;
2494	kmsg->msg_namelen = 0;
2495	}
2496
2497	if (msg->msg_iovlen > UIO_MAXIOV)
2498	return -EMSGSIZE;
2499
2500	kmsg->msg_iocb = NULL;
2501	kmsg->msg_ubuf = NULL;
2502	return 0;
2503	}
2504
2505	static int copy_msghdr_from_user(struct msghdr *kmsg,
2506	struct user_msghdr __user *umsg,
2507	struct sockaddr __user **save_addr,
2508	struct iovec **iov)
2509	{
2510	struct user_msghdr msg;
2511	ssize_t err;
2512
2513	if (copy_from_user(&msg, umsg, sizeof(*umsg)))
2514	return -EFAULT;
2515
2516	err = __copy_msghdr(kmsg, &msg, save_addr);
2517	if (err)
2518	return err;
2519
2520	err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE,
2521	msg.msg_iov, msg.msg_iovlen,
2522	UIO_FASTIOV, iov, &kmsg->msg_iter);
2523	return err < 0 ? err : 0;
2524	}
2525
2526	static int ____sys_sendmsg(struct socket sock, struct msghdr msg_sys,
2527	unsigned int flags, struct used_address *used_address,
2528	unsigned int allowed_msghdr_flags)
2529	{
2530	unsigned char ctl[sizeof(struct cmsghdr) + 20]
2531	__aligned(sizeof(__kernel_size_t));
2532	/* 20 is size of ipv6_pktinfo */
2533	unsigned char *ctl_buf = ctl;
2534	int ctl_len;
2535	ssize_t err;
2536
2537	err = -ENOBUFS;
2538
2539	if (msg_sys->msg_controllen > INT_MAX)
2540	goto out;
2541	flags \|= (msg_sys->msg_flags & allowed_msghdr_flags);
2542	ctl_len = msg_sys->msg_controllen;
2543	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2544	err =
2545	cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2546	sizeof(ctl));
2547	if (err)
2548	goto out;
2549	ctl_buf = msg_sys->msg_control;
2550	ctl_len = msg_sys->msg_controllen;
2551	} else if (ctl_len) {
2552	BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2553	CMSG_ALIGN(sizeof(struct cmsghdr)));
2554	if (ctl_len > sizeof(ctl)) {
2555	ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2556	if (ctl_buf == NULL)
2557	goto out;
2558	}
2559	err = -EFAULT;
2560	if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len))
2561	goto out_freectl;
2562	msg_sys->msg_control = ctl_buf;
2563	msg_sys->msg_control_is_user = false;
2564	}
2565	flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
2566	msg_sys->msg_flags = flags;
2567
2568	if (sock->file->f_flags & O_NONBLOCK)
2569	msg_sys->msg_flags \|= MSG_DONTWAIT;
2570	/*
2571	* If this is sendmmsg() and current destination address is same as
2572	* previously succeeded address, omit asking LSM's decision.
2573	* used_address->name_len is initialized to UINT_MAX so that the first
2574	* destination address never matches.
2575	*/
2576	if (used_address && msg_sys->msg_name &&
2577	used_address->name_len == msg_sys->msg_namelen &&
2578	!memcmp(&used_address->name, msg_sys->msg_name,
2579	used_address->name_len)) {
2580	err = sock_sendmsg_nosec(sock, msg_sys);
2581	goto out_freectl;
2582	}
2583	err = __sock_sendmsg(sock, msg_sys);
2584	/*
2585	* If this is sendmmsg() and sending to current destination address was
2586	* successful, remember it.
2587	*/
2588	if (used_address && err >= 0) {
2589	used_address->name_len = msg_sys->msg_namelen;
2590	if (msg_sys->msg_name)
2591	memcpy(&used_address->name, msg_sys->msg_name,
2592	used_address->name_len);
2593	}
2594
2595	out_freectl:
2596	if (ctl_buf != ctl)
2597	sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2598	out:
2599	return err;
2600	}
2601
2602	static int sendmsg_copy_msghdr(struct msghdr *msg,
2603	struct user_msghdr __user *umsg, unsigned flags,
2604	struct iovec **iov)
2605	{
2606	int err;
2607
2608	if (flags & MSG_CMSG_COMPAT) {
2609	struct compat_msghdr __user *msg_compat;
2610
2611	msg_compat = (struct compat_msghdr __user *) umsg;
2612	err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2613	} else {
2614	err = copy_msghdr_from_user(msg, umsg, NULL, iov);
2615	}
2616	if (err < 0)
2617	return err;
2618
2619	return 0;
2620	}
2621
2622	static int ___sys_sendmsg(struct socket sock, struct user_msghdr __user msg,
2623	struct msghdr *msg_sys, unsigned int flags,
2624	struct used_address *used_address,
2625	unsigned int allowed_msghdr_flags)
2626	{
2627	struct sockaddr_storage address;
2628	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2629	ssize_t err;
2630
2631	msg_sys->msg_name = &address;
2632
2633	err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
2634	if (err < 0)
2635	return err;
2636
2637	err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2638	allowed_msghdr_flags);
2639	kfree(iov);
2640	return err;
2641	}
2642
2643	/*
2644	* BSD sendmsg interface
2645	*/
2646	long __sys_sendmsg_sock(struct socket sock, struct msghdr msg,
2647	unsigned int flags)
2648	{
2649	return ____sys_sendmsg(sock, msg, flags, NULL, 0);
2650	}
2651
2652	long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2653	bool forbid_cmsg_compat)
2654	{
2655	struct msghdr msg_sys;
2656	struct socket *sock;
2657
2658	if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2659	return -EINVAL;
2660
2661	CLASS(fd, f)(fd);
2662
2663	if (fd_empty(f))
2664	return -EBADF;
2665	sock = sock_from_file(fd_file(f));
2666	if (unlikely(!sock))
2667	return -ENOTSOCK;
2668
2669	return ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
2670	}
2671
2672	SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
2673	{
2674	return __sys_sendmsg(fd, msg, flags, true);
2675	}
2676
2677	/*
2678	* Linux sendmmsg interface
2679	*/
2680
2681	int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2682	unsigned int flags, bool forbid_cmsg_compat)
2683	{
2684	int err, datagrams;
2685	struct socket *sock;
2686	struct mmsghdr __user *entry;
2687	struct compat_mmsghdr __user *compat_entry;
2688	struct msghdr msg_sys;
2689	struct used_address used_address;
2690	unsigned int oflags = flags;
2691
2692	if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2693	return -EINVAL;
2694
2695	if (vlen > UIO_MAXIOV)
2696	vlen = UIO_MAXIOV;
2697
2698	datagrams = 0;
2699
2700	CLASS(fd, f)(fd);
2701
2702	if (fd_empty(f))
2703	return -EBADF;
2704	sock = sock_from_file(fd_file(f));
2705	if (unlikely(!sock))
2706	return -ENOTSOCK;
2707
2708	used_address.name_len = UINT_MAX;
2709	entry = mmsg;
2710	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2711	err = 0;
2712	flags \|= MSG_BATCH;
2713
2714	while (datagrams < vlen) {
2715	if (datagrams == vlen - 1)
2716	flags = oflags;
2717
2718	if (MSG_CMSG_COMPAT & flags) {
2719	err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
2720	&msg_sys, flags, &used_address, MSG_EOR);
2721	if (err < 0)
2722	break;
2723	err = __put_user(err, &compat_entry->msg_len);
2724	++compat_entry;
2725	} else {
2726	err = ___sys_sendmsg(sock,
2727	(struct user_msghdr __user *)entry,
2728	&msg_sys, flags, &used_address, MSG_EOR);
2729	if (err < 0)
2730	break;
2731	err = put_user(err, &entry->msg_len);
2732	++entry;
2733	}
2734
2735	if (err)
2736	break;
2737	++datagrams;
2738	if (msg_data_left(&msg_sys))
2739	break;
2740	cond_resched();
2741	}
2742
2743	/* We only return an error if no datagrams were able to be sent */
2744	if (datagrams != 0)
2745	return datagrams;
2746
2747	return err;
2748	}
2749
2750	SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2751	unsigned int, vlen, unsigned int, flags)
2752	{
2753	return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
2754	}
2755
2756	static int recvmsg_copy_msghdr(struct msghdr *msg,
2757	struct user_msghdr __user *umsg, unsigned flags,
2758	struct sockaddr __user **uaddr,
2759	struct iovec **iov)
2760	{
2761	ssize_t err;
2762
2763	if (MSG_CMSG_COMPAT & flags) {
2764	struct compat_msghdr __user *msg_compat;
2765
2766	msg_compat = (struct compat_msghdr __user *) umsg;
2767	err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
2768	} else {
2769	err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
2770	}
2771	if (err < 0)
2772	return err;
2773
2774	return 0;
2775	}
2776
2777	static int ____sys_recvmsg(struct socket sock, struct msghdr msg_sys,
2778	struct user_msghdr __user *msg,
2779	struct sockaddr __user *uaddr,
2780	unsigned int flags, int nosec)
2781	{
2782	struct compat_msghdr __user *msg_compat =
2783	(struct compat_msghdr __user *) msg;
2784	int __user *uaddr_len = COMPAT_NAMELEN(msg);
2785	struct sockaddr_storage addr;
2786	unsigned long cmsg_ptr;
2787	int len;
2788	ssize_t err;
2789
2790	msg_sys->msg_name = &addr;
2791	cmsg_ptr = (unsigned long)msg_sys->msg_control;
2792	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC\|MSG_CMSG_COMPAT);
2793
2794	/* We assume all kernel code knows the size of sockaddr_storage */
2795	msg_sys->msg_namelen = 0;
2796
2797	if (sock->file->f_flags & O_NONBLOCK)
2798	flags \|= MSG_DONTWAIT;
2799
2800	if (unlikely(nosec))
2801	err = sock_recvmsg_nosec(sock, msg_sys, flags);
2802	else
2803	err = sock_recvmsg(sock, msg_sys, flags);
2804
2805	if (err < 0)
2806	goto out;
2807	len = err;
2808
2809	if (uaddr != NULL) {
2810	err = move_addr_to_user(&addr,
2811	msg_sys->msg_namelen, uaddr,
2812	uaddr_len);
2813	if (err < 0)
2814	goto out;
2815	}
2816	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2817	COMPAT_FLAGS(msg));
2818	if (err)
2819	goto out;
2820	if (MSG_CMSG_COMPAT & flags)
2821	err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2822	&msg_compat->msg_controllen);
2823	else
2824	err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2825	&msg->msg_controllen);
2826	if (err)
2827	goto out;
2828	err = len;
2829	out:
2830	return err;
2831	}
2832
2833	static int ___sys_recvmsg(struct socket sock, struct user_msghdr __user msg,
2834	struct msghdr *msg_sys, unsigned int flags, int nosec)
2835	{
2836	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2837	/* user mode address pointers */
2838	struct sockaddr __user *uaddr;
2839	ssize_t err;
2840
2841	err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
2842	if (err < 0)
2843	return err;
2844
2845	err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
2846	kfree(iov);
2847	return err;
2848	}
2849
2850	/*
2851	* BSD recvmsg interface
2852	*/
2853
2854	long __sys_recvmsg_sock(struct socket sock, struct msghdr msg,
2855	struct user_msghdr __user *umsg,
2856	struct sockaddr __user *uaddr, unsigned int flags)
2857	{
2858	return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
2859	}
2860
2861	long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2862	bool forbid_cmsg_compat)
2863	{
2864	struct msghdr msg_sys;
2865	struct socket *sock;
2866
2867	if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2868	return -EINVAL;
2869
2870	CLASS(fd, f)(fd);
2871
2872	if (fd_empty(f))
2873	return -EBADF;
2874	sock = sock_from_file(fd_file(f));
2875	if (unlikely(!sock))
2876	return -ENOTSOCK;
2877
2878	return ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2879	}
2880
2881	SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
2882	unsigned int, flags)
2883	{
2884	return __sys_recvmsg(fd, msg, flags, true);
2885	}
2886
2887	/*
2888	* Linux recvmmsg interface
2889	*/
2890
2891	static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2892	unsigned int vlen, unsigned int flags,
2893	struct timespec64 *timeout)
2894	{
2895	int err = 0, datagrams;
2896	struct socket *sock;
2897	struct mmsghdr __user *entry;
2898	struct compat_mmsghdr __user *compat_entry;
2899	struct msghdr msg_sys;
2900	struct timespec64 end_time;
2901	struct timespec64 timeout64;
2902
2903	if (timeout &&
2904	poll_select_set_timeout(&end_time, timeout->tv_sec,
2905	timeout->tv_nsec))
2906	return -EINVAL;
2907
2908	datagrams = 0;
2909
2910	CLASS(fd, f)(fd);
2911
2912	if (fd_empty(f))
2913	return -EBADF;
2914	sock = sock_from_file(fd_file(f));
2915	if (unlikely(!sock))
2916	return -ENOTSOCK;
2917
2918	if (likely(!(flags & MSG_ERRQUEUE))) {
2919	err = sock_error(sock->sk);
2920	if (err)
2921	return err;
2922	}
2923
2924	entry = mmsg;
2925	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2926
2927	while (datagrams < vlen) {
2928	/*
2929	* No need to ask LSM for more than the first datagram.
2930	*/
2931	if (MSG_CMSG_COMPAT & flags) {
2932	err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
2933	&msg_sys, flags & ~MSG_WAITFORONE,
2934	datagrams);
2935	if (err < 0)
2936	break;
2937	err = __put_user(err, &compat_entry->msg_len);
2938	++compat_entry;
2939	} else {
2940	err = ___sys_recvmsg(sock,
2941	(struct user_msghdr __user *)entry,
2942	&msg_sys, flags & ~MSG_WAITFORONE,
2943	datagrams);
2944	if (err < 0)
2945	break;
2946	err = put_user(err, &entry->msg_len);
2947	++entry;
2948	}
2949
2950	if (err)
2951	break;
2952	++datagrams;
2953
2954	/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2955	if (flags & MSG_WAITFORONE)
2956	flags \|= MSG_DONTWAIT;
2957
2958	if (timeout) {
2959	ktime_get_ts64(&timeout64);
2960	*timeout = timespec64_sub(end_time, timeout64);
2961	if (timeout->tv_sec < 0) {
2962	timeout->tv_sec = timeout->tv_nsec = 0;
2963	break;
2964	}
2965
2966	/* Timeout, return less than vlen datagrams */
2967	if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2968	break;
2969	}
2970
2971	/* Out of band data, return right away */
2972	if (msg_sys.msg_flags & MSG_OOB)
2973	break;
2974	cond_resched();
2975	}
2976
2977	if (err == 0)
2978	return datagrams;
2979
2980	if (datagrams == 0)
2981	return err;
2982
2983	/*
2984	* We may return less entries than requested (vlen) if the
2985	* sock is non block and there aren't enough datagrams...
2986	*/
2987	if (err != -EAGAIN) {
2988	/*
2989	* ... or if recvmsg returns an error after we
2990	* received some datagrams, where we record the
2991	* error to return on the next call or if the
2992	* app asks about it using getsockopt(SO_ERROR).
2993	*/
2994	WRITE_ONCE(sock->sk->sk_err, -err);
2995	}
2996	return datagrams;
2997	}
2998
2999	int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
3000	unsigned int vlen, unsigned int flags,
3001	struct __kernel_timespec __user *timeout,
3002	struct old_timespec32 __user *timeout32)
3003	{
3004	int datagrams;
3005	struct timespec64 timeout_sys;
3006
3007	if (timeout && get_timespec64(&timeout_sys, timeout))
3008	return -EFAULT;
3009
3010	if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
3011	return -EFAULT;
3012
3013	if (!timeout && !timeout32)
3014	return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
3015
3016	datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
3017
3018	if (datagrams <= 0)
3019	return datagrams;
3020
3021	if (timeout && put_timespec64(&timeout_sys, timeout))
3022	datagrams = -EFAULT;
3023
3024	if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
3025	datagrams = -EFAULT;
3026
3027	return datagrams;
3028	}
3029
3030	SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
3031	unsigned int, vlen, unsigned int, flags,
3032	struct __kernel_timespec __user *, timeout)
3033	{
3034	if (flags & MSG_CMSG_COMPAT)
3035	return -EINVAL;
3036
3037	return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
3038	}
3039
3040	#ifdef CONFIG_COMPAT_32BIT_TIME
3041	SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
3042	unsigned int, vlen, unsigned int, flags,
3043	struct old_timespec32 __user *, timeout)
3044	{
3045	if (flags & MSG_CMSG_COMPAT)
3046	return -EINVAL;
3047
3048	return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
3049	}
3050	#endif
3051
3052	#ifdef __ARCH_WANT_SYS_SOCKETCALL
3053	/* Argument list sizes for sys_socketcall */
3054	#define AL(x) ((x) * sizeof(unsigned long))
3055	static const unsigned char nargs[21] = {
3056	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
3057	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
3058	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
3059	AL(4), AL(5), AL(4)
3060	};
3061
3062	#undef AL
3063
3064	/*
3065	* System call vectors.
3066	*
3067	* Argument checking cleaned up. Saved 20% in size.
3068	* This function doesn't need to set the kernel lock because
3069	* it is set by the callees.
3070	*/
3071
3072	SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
3073	{
3074	unsigned long a[AUDITSC_ARGS];
3075	unsigned long a0, a1;
3076	int err;
3077	unsigned int len;
3078
3079	if (call < 1 \|\| call > SYS_SENDMMSG)
3080	return -EINVAL;
3081	call = array_index_nospec(call, SYS_SENDMMSG + 1);
3082
3083	len = nargs[call];
3084	if (len > sizeof(a))
3085	return -EINVAL;
3086
3087	/* copy_from_user should be SMP safe. */
3088	if (copy_from_user(a, args, len))
3089	return -EFAULT;
3090
3091	err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
3092	if (err)
3093	return err;
3094
3095	a0 = a[0];
3096	a1 = a[1];
3097
3098	switch (call) {
3099	case SYS_SOCKET:
3100	err = __sys_socket(a0, a1, a[2]);
3101	break;
3102	case SYS_BIND:
3103	err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
3104	break;
3105	case SYS_CONNECT:
3106	err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
3107	break;
3108	case SYS_LISTEN:
3109	err = __sys_listen(a0, a1);
3110	break;
3111	case SYS_ACCEPT:
3112	err = __sys_accept4(a0, (struct sockaddr __user *)a1,
3113	(int __user *)a[2], 0);
3114	break;
3115	case SYS_GETSOCKNAME:
3116	err =
3117	__sys_getsockname(a0, (struct sockaddr __user *)a1,
3118	(int __user *)a[2]);
3119	break;
3120	case SYS_GETPEERNAME:
3121	err =
3122	__sys_getpeername(a0, (struct sockaddr __user *)a1,
3123	(int __user *)a[2]);
3124	break;
3125	case SYS_SOCKETPAIR:
3126	err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
3127	break;
3128	case SYS_SEND:
3129	err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
3130	NULL, 0);
3131	break;
3132	case SYS_SENDTO:
3133	err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
3134	(struct sockaddr __user *)a[4], a[5]);
3135	break;
3136	case SYS_RECV:
3137	err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
3138	NULL, NULL);
3139	break;
3140	case SYS_RECVFROM:
3141	err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
3142	(struct sockaddr __user *)a[4],
3143	(int __user *)a[5]);
3144	break;
3145	case SYS_SHUTDOWN:
3146	err = __sys_shutdown(a0, a1);
3147	break;
3148	case SYS_SETSOCKOPT:
3149	err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
3150	a[4]);
3151	break;
3152	case SYS_GETSOCKOPT:
3153	err =
3154	__sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
3155	(int __user *)a[4]);
3156	break;
3157	case SYS_SENDMSG:
3158	err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
3159	a[2], true);
3160	break;
3161	case SYS_SENDMMSG:
3162	err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
3163	a[3], true);
3164	break;
3165	case SYS_RECVMSG:
3166	err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
3167	a[2], true);
3168	break;
3169	case SYS_RECVMMSG:
3170	if (IS_ENABLED(CONFIG_64BIT))
3171	err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
3172	a[2], a[3],
3173	(struct __kernel_timespec __user *)a[4],
3174	NULL);
3175	else
3176	err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
3177	a[2], a[3], NULL,
3178	(struct old_timespec32 __user *)a[4]);
3179	break;
3180	case SYS_ACCEPT4:
3181	err = __sys_accept4(a0, (struct sockaddr __user *)a1,
3182	(int __user *)a[2], a[3]);
3183	break;
3184	default:
3185	err = -EINVAL;
3186	break;
3187	}
3188	return err;
3189	}
3190
3191	#endif /* __ARCH_WANT_SYS_SOCKETCALL */
3192
3193	/**
3194	* sock_register - add a socket protocol handler
3195	* @ops: description of protocol
3196	*
3197	* This function is called by a protocol handler that wants to
3198	* advertise its address family, and have it linked into the
3199	* socket interface. The value ops->family corresponds to the
3200	* socket system call protocol family.
3201	*/
3202	int sock_register(const struct net_proto_family *ops)
3203	{
3204	int err;
3205
3206	if (ops->family >= NPROTO) {
3207	pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
3208	return -ENOBUFS;
3209	}
3210
3211	spin_lock(&net_family_lock);
3212	if (rcu_dereference_protected(net_families[ops->family],
3213	lockdep_is_held(&net_family_lock)))
3214	err = -EEXIST;
3215	else {
3216	rcu_assign_pointer(net_families[ops->family], ops);
3217	err = 0;
3218	}
3219	spin_unlock(&net_family_lock);
3220
3221	pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]);
3222	return err;
3223	}
3224	EXPORT_SYMBOL(sock_register);
3225
3226	/**
3227	* sock_unregister - remove a protocol handler
3228	* @family: protocol family to remove
3229	*
3230	* This function is called by a protocol handler that wants to
3231	* remove its address family, and have it unlinked from the
3232	* new socket creation.
3233	*
3234	* If protocol handler is a module, then it can use module reference
3235	* counts to protect against new references. If protocol handler is not
3236	* a module then it needs to provide its own protection in
3237	* the ops->create routine.
3238	*/
3239	void sock_unregister(int family)
3240	{
3241	BUG_ON(family < 0 \|\| family >= NPROTO);
3242
3243	spin_lock(&net_family_lock);
3244	RCU_INIT_POINTER(net_families[family], NULL);
3245	spin_unlock(&net_family_lock);
3246
3247	synchronize_rcu();
3248
3249	pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]);
3250	}
3251	EXPORT_SYMBOL(sock_unregister);
3252
3253	bool sock_is_registered(int family)
3254	{
3255	return family < NPROTO && rcu_access_pointer(net_families[family]);
3256	}
3257
3258	static int __init sock_init(void)
3259	{
3260	int err;
3261	/*
3262	* Initialize the network sysctl infrastructure.
3263	*/
3264	err = net_sysctl_init();
3265	if (err)
3266	goto out;
3267
3268	/*
3269	* Initialize skbuff SLAB cache
3270	*/
3271	skb_init();
3272
3273	/*
3274	* Initialize the protocols module.
3275	*/
3276
3277	init_inodecache();
3278
3279	err = register_filesystem(&sock_fs_type);
3280	if (err)
3281	goto out;
3282	sock_mnt = kern_mount(&sock_fs_type);
3283	if (IS_ERR(sock_mnt)) {
3284	err = PTR_ERR(sock_mnt);
3285	goto out_mount;
3286	}
3287
3288	/* The real protocol initialization is performed in later initcalls.
3289	*/
3290
3291	#ifdef CONFIG_NETFILTER
3292	err = netfilter_init();
3293	if (err)
3294	goto out;
3295	#endif
3296
3297	ptp_classifier_init();
3298
3299	out:
3300	return err;
3301
3302	out_mount:
3303	unregister_filesystem(&sock_fs_type);
3304	goto out;
3305	}
3306
3307	core_initcall(sock_init); /* early initcall */
3308
3309	#ifdef CONFIG_PROC_FS
3310	void socket_seq_show(struct seq_file *seq)
3311	{
3312	seq_printf(seq, "sockets: used %d\n",
3313	sock_inuse_get(seq->private));
3314	}
3315	#endif /* CONFIG_PROC_FS */
3316
3317	/* Handle the fact that while struct ifreq has the same layout on
3318	* 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3319	* which are handled elsewhere, it still has different size due to
3320	* ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3321	* resulting in struct ifreq being 32 and 40 bytes respectively).
3322	* As a result, if the struct happens to be at the end of a page and
3323	* the next page isn't readable/writable, we get a fault. To prevent
3324	* that, copy back and forth to the full size.
3325	*/
3326	int get_user_ifreq(struct ifreq ifr, void __user ifrdata, void __user arg)
3327	{
3328	if (in_compat_syscall()) {
3329	struct compat_ifreq ifr32 = (struct compat_ifreq )ifr;
3330
3331	memset(ifr, 0, sizeof(*ifr));
3332	if (copy_from_user(ifr32, arg, sizeof(*ifr32)))
3333	return -EFAULT;
3334
3335	if (ifrdata)
3336	*ifrdata = compat_ptr(ifr32->ifr_data);
3337
3338	return 0;
3339	}
3340
3341	if (copy_from_user(ifr, arg, sizeof(*ifr)))
3342	return -EFAULT;
3343
3344	if (ifrdata)
3345	*ifrdata = ifr->ifr_data;
3346
3347	return 0;
3348	}
3349	EXPORT_SYMBOL(get_user_ifreq);
3350
3351	int put_user_ifreq(struct ifreq ifr, void __user arg)
3352	{
3353	size_t size = sizeof(*ifr);
3354
3355	if (in_compat_syscall())
3356	size = sizeof(struct compat_ifreq);
3357
3358	if (copy_to_user(arg, ifr, size))
3359	return -EFAULT;
3360
3361	return 0;
3362	}
3363	EXPORT_SYMBOL(put_user_ifreq);
3364
3365	#ifdef CONFIG_COMPAT
3366	static int compat_siocwandev(struct net net, struct compat_ifreq __user uifr32)
3367	{
3368	compat_uptr_t uptr32;
3369	struct ifreq ifr;
3370	void __user *saved;
3371	int err;
3372
3373	if (get_user_ifreq(&ifr, NULL, uifr32))
3374	return -EFAULT;
3375
3376	if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3377	return -EFAULT;
3378
3379	saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3380	ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
3381
3382	err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL);
3383	if (!err) {
3384	ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
3385	if (put_user_ifreq(&ifr, uifr32))
3386	err = -EFAULT;
3387	}
3388	return err;
3389	}
3390
3391	/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3392	static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
3393	struct compat_ifreq __user *u_ifreq32)
3394	{
3395	struct ifreq ifreq;
3396	void __user *data;
3397
3398	if (!is_socket_ioctl_cmd(cmd))
3399	return -ENOTTY;
3400	if (get_user_ifreq(&ifreq, &data, u_ifreq32))
3401	return -EFAULT;
3402	ifreq.ifr_data = data;
3403
3404	return dev_ioctl(net, cmd, &ifreq, data, NULL);
3405	}
3406
3407	static int compat_sock_ioctl_trans(struct file file, struct socket sock,
3408	unsigned int cmd, unsigned long arg)
3409	{
3410	void __user *argp = compat_ptr(arg);
3411	struct sock *sk = sock->sk;
3412	struct net *net = sock_net(sk);
3413	const struct proto_ops *ops;
3414
3415	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3416	return sock_ioctl(file, cmd, (unsigned long)argp);
3417
3418	switch (cmd) {
3419	case SIOCWANDEV:
3420	return compat_siocwandev(net, argp);
3421	case SIOCGSTAMP_OLD:
3422	case SIOCGSTAMPNS_OLD:
3423	ops = READ_ONCE(sock->ops);
3424	if (!ops->gettstamp)
3425	return -ENOIOCTLCMD;
3426	return ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
3427	!COMPAT_USE_64BIT_TIME);
3428
3429	case SIOCETHTOOL:
3430	case SIOCBONDSLAVEINFOQUERY:
3431	case SIOCBONDINFOQUERY:
3432	case SIOCSHWTSTAMP:
3433	case SIOCGHWTSTAMP:
3434	return compat_ifr_data_ioctl(net, cmd, argp);
3435
3436	case FIOSETOWN:
3437	case SIOCSPGRP:
3438	case FIOGETOWN:
3439	case SIOCGPGRP:
3440	case SIOCBRADDBR:
3441	case SIOCBRDELBR:
3442	case SIOCGIFVLAN:
3443	case SIOCSIFVLAN:
3444	case SIOCGSKNS:
3445	case SIOCGSTAMP_NEW:
3446	case SIOCGSTAMPNS_NEW:
3447	case SIOCGIFCONF:
3448	case SIOCSIFBR:
3449	case SIOCGIFBR:
3450	return sock_ioctl(file, cmd, arg);
3451
3452	case SIOCGIFFLAGS:
3453	case SIOCSIFFLAGS:
3454	case SIOCGIFMAP:
3455	case SIOCSIFMAP:
3456	case SIOCGIFMETRIC:
3457	case SIOCSIFMETRIC:
3458	case SIOCGIFMTU:
3459	case SIOCSIFMTU:
3460	case SIOCGIFMEM:
3461	case SIOCSIFMEM:
3462	case SIOCGIFHWADDR:
3463	case SIOCSIFHWADDR:
3464	case SIOCADDMULTI:
3465	case SIOCDELMULTI:
3466	case SIOCGIFINDEX:
3467	case SIOCGIFADDR:
3468	case SIOCSIFADDR:
3469	case SIOCSIFHWBROADCAST:
3470	case SIOCDIFADDR:
3471	case SIOCGIFBRDADDR:
3472	case SIOCSIFBRDADDR:
3473	case SIOCGIFDSTADDR:
3474	case SIOCSIFDSTADDR:
3475	case SIOCGIFNETMASK:
3476	case SIOCSIFNETMASK:
3477	case SIOCSIFPFLAGS:
3478	case SIOCGIFPFLAGS:
3479	case SIOCGIFTXQLEN:
3480	case SIOCSIFTXQLEN:
3481	case SIOCBRADDIF:
3482	case SIOCBRDELIF:
3483	case SIOCGIFNAME:
3484	case SIOCSIFNAME:
3485	case SIOCGMIIPHY:
3486	case SIOCGMIIREG:
3487	case SIOCSMIIREG:
3488	case SIOCBONDENSLAVE:
3489	case SIOCBONDRELEASE:
3490	case SIOCBONDSETHWADDR:
3491	case SIOCBONDCHANGEACTIVE:
3492	case SIOCSARP:
3493	case SIOCGARP:
3494	case SIOCDARP:
3495	case SIOCOUTQ:
3496	case SIOCOUTQNSD:
3497	case SIOCATMARK:
3498	return sock_do_ioctl(net, sock, cmd, arg);
3499	}
3500
3501	return -ENOIOCTLCMD;
3502	}
3503
3504	static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3505	unsigned long arg)
3506	{
3507	struct socket *sock = file->private_data;
3508	const struct proto_ops *ops = READ_ONCE(sock->ops);
3509	int ret = -ENOIOCTLCMD;
3510	struct sock *sk;
3511	struct net *net;
3512
3513	sk = sock->sk;
3514	net = sock_net(sk);
3515
3516	if (ops->compat_ioctl)
3517	ret = ops->compat_ioctl(sock, cmd, arg);
3518
3519	if (ret == -ENOIOCTLCMD &&
3520	(cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3521	ret = compat_wext_handle_ioctl(net, cmd, arg);
3522
3523	if (ret == -ENOIOCTLCMD)
3524	ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3525
3526	return ret;
3527	}
3528	#endif
3529
3530	/**
3531	* kernel_bind - bind an address to a socket (kernel space)
3532	* @sock: socket
3533	* @addr: address
3534	* @addrlen: length of address
3535	*
3536	* Returns 0 or an error.
3537	*/
3538
3539	int kernel_bind(struct socket sock, struct sockaddr addr, int addrlen)
3540	{
3541	struct sockaddr_storage address;
3542
3543	memcpy(&address, addr, addrlen);
3544
3545	return READ_ONCE(sock->ops)->bind(sock, (struct sockaddr *)&address,
3546	addrlen);
3547	}
3548	EXPORT_SYMBOL(kernel_bind);
3549
3550	/**
3551	* kernel_listen - move socket to listening state (kernel space)
3552	* @sock: socket
3553	* @backlog: pending connections queue size
3554	*
3555	* Returns 0 or an error.
3556	*/
3557
3558	int kernel_listen(struct socket *sock, int backlog)
3559	{
3560	return READ_ONCE(sock->ops)->listen(sock, backlog);
3561	}
3562	EXPORT_SYMBOL(kernel_listen);
3563
3564	/**
3565	* kernel_accept - accept a connection (kernel space)
3566	* @sock: listening socket
3567	* @newsock: new connected socket
3568	* @flags: flags
3569	*
3570	* @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3571	* If it fails, @newsock is guaranteed to be %NULL.
3572	* Returns 0 or an error.
3573	*/
3574
3575	int kernel_accept(struct socket sock, struct socket *newsock, int flags)
3576	{
3577	struct sock *sk = sock->sk;
3578	const struct proto_ops *ops = READ_ONCE(sock->ops);
3579	struct proto_accept_arg arg = {
3580	.flags = flags,
3581	.kern = true,
3582	};
3583	int err;
3584
3585	err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3586	newsock);
3587	if (err < 0)
3588	goto done;
3589
3590	err = ops->accept(sock, *newsock, &arg);
3591	if (err < 0) {
3592	sock_release(*newsock);
3593	*newsock = NULL;
3594	goto done;
3595	}
3596
3597	(*newsock)->ops = ops;
3598	__module_get(ops->owner);
3599
3600	done:
3601	return err;
3602	}
3603	EXPORT_SYMBOL(kernel_accept);
3604
3605	/**
3606	* kernel_connect - connect a socket (kernel space)
3607	* @sock: socket
3608	* @addr: address
3609	* @addrlen: address length
3610	* @flags: flags (O_NONBLOCK, ...)
3611	*
3612	* For datagram sockets, @addr is the address to which datagrams are sent
3613	* by default, and the only address from which datagrams are received.
3614	* For stream sockets, attempts to connect to @addr.
3615	* Returns 0 or an error code.
3616	*/
3617
3618	int kernel_connect(struct socket sock, struct sockaddr addr, int addrlen,
3619	int flags)
3620	{
3621	struct sockaddr_storage address;
3622
3623	memcpy(&address, addr, addrlen);
3624
3625	return READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)&address,
3626	addrlen, flags);
3627	}
3628	EXPORT_SYMBOL(kernel_connect);
3629
3630	/**
3631	* kernel_getsockname - get the address which the socket is bound (kernel space)
3632	* @sock: socket
3633	* @addr: address holder
3634	*
3635	* Fills the @addr pointer with the address which the socket is bound.
3636	* Returns the length of the address in bytes or an error code.
3637	*/
3638
3639	int kernel_getsockname(struct socket sock, struct sockaddr addr)
3640	{
3641	return READ_ONCE(sock->ops)->getname(sock, addr, 0);
3642	}
3643	EXPORT_SYMBOL(kernel_getsockname);
3644
3645	/**
3646	* kernel_getpeername - get the address which the socket is connected (kernel space)
3647	* @sock: socket
3648	* @addr: address holder
3649	*
3650	* Fills the @addr pointer with the address which the socket is connected.
3651	* Returns the length of the address in bytes or an error code.
3652	*/
3653
3654	int kernel_getpeername(struct socket sock, struct sockaddr addr)
3655	{
3656	return READ_ONCE(sock->ops)->getname(sock, addr, 1);
3657	}
3658	EXPORT_SYMBOL(kernel_getpeername);
3659
3660	/**
3661	* kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
3662	* @sock: socket
3663	* @how: connection part
3664	*
3665	* Returns 0 or an error.
3666	*/
3667
3668	int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3669	{
3670	return READ_ONCE(sock->ops)->shutdown(sock, how);
3671	}
3672	EXPORT_SYMBOL(kernel_sock_shutdown);
3673
3674	/**
3675	* kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3676	* @sk: socket
3677	*
3678	* This routine returns the IP overhead imposed by a socket i.e.
3679	* the length of the underlying IP header, depending on whether
3680	* this is an IPv4 or IPv6 socket and the length from IP options turned
3681	* on at the socket. Assumes that the caller has a lock on the socket.
3682	*/
3683
3684	u32 kernel_sock_ip_overhead(struct sock *sk)
3685	{
3686	struct inet_sock *inet;
3687	struct ip_options_rcu *opt;
3688	u32 overhead = 0;
3689	#if IS_ENABLED(CONFIG_IPV6)
3690	struct ipv6_pinfo *np;
3691	struct ipv6_txoptions *optv6 = NULL;
3692	#endif /* IS_ENABLED(CONFIG_IPV6) */
3693
3694	if (!sk)
3695	return overhead;
3696
3697	switch (sk->sk_family) {
3698	case AF_INET:
3699	inet = inet_sk(sk);
3700	overhead += sizeof(struct iphdr);
3701	opt = rcu_dereference_protected(inet->inet_opt,
3702	sock_owned_by_user(sk));
3703	if (opt)
3704	overhead += opt->opt.optlen;
3705	return overhead;
3706	#if IS_ENABLED(CONFIG_IPV6)
3707	case AF_INET6:
3708	np = inet6_sk(sk);
3709	overhead += sizeof(struct ipv6hdr);
3710	if (np)
3711	optv6 = rcu_dereference_protected(np->opt,
3712	sock_owned_by_user(sk));
3713	if (optv6)
3714	overhead += (optv6->opt_flen + optv6->opt_nflen);
3715	return overhead;
3716	#endif /* IS_ENABLED(CONFIG_IPV6) */
3717	default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3718	return overhead;
3719	}
3720	}
3721	EXPORT_SYMBOL(kernel_sock_ip_overhead);