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, <obz@Kodak.COM>
8	* Ross Biro
9	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.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	.llseek = no_llseek,
157	.read_iter = sock_read_iter,
158	.write_iter = sock_write_iter,
159	.poll = sock_poll,
160	.unlocked_ioctl = sock_ioctl,
161	#ifdef CONFIG_COMPAT
162	.compat_ioctl = compat_sock_ioctl,
163	#endif
164	.uring_cmd = io_uring_cmd_sock,
165	.mmap = sock_mmap,
166	.release = sock_close,
167	.fasync = sock_fasync,
168	.splice_write = splice_to_socket,
169	.splice_read = sock_splice_read,
170	.splice_eof = sock_splice_eof,
171	.show_fdinfo = sock_show_fdinfo,
172	};
173
174	static const char * const pf_family_names[] = {
175	[PF_UNSPEC] = "PF_UNSPEC",
176	[PF_UNIX] = "PF_UNIX/PF_LOCAL",
177	[PF_INET] = "PF_INET",
178	[PF_AX25] = "PF_AX25",
179	[PF_IPX] = "PF_IPX",
180	[PF_APPLETALK] = "PF_APPLETALK",
181	[PF_NETROM] = "PF_NETROM",
182	[PF_BRIDGE] = "PF_BRIDGE",
183	[PF_ATMPVC] = "PF_ATMPVC",
184	[PF_X25] = "PF_X25",
185	[PF_INET6] = "PF_INET6",
186	[PF_ROSE] = "PF_ROSE",
187	[PF_DECnet] = "PF_DECnet",
188	[PF_NETBEUI] = "PF_NETBEUI",
189	[PF_SECURITY] = "PF_SECURITY",
190	[PF_KEY] = "PF_KEY",
191	[PF_NETLINK] = "PF_NETLINK/PF_ROUTE",
192	[PF_PACKET] = "PF_PACKET",
193	[PF_ASH] = "PF_ASH",
194	[PF_ECONET] = "PF_ECONET",
195	[PF_ATMSVC] = "PF_ATMSVC",
196	[PF_RDS] = "PF_RDS",
197	[PF_SNA] = "PF_SNA",
198	[PF_IRDA] = "PF_IRDA",
199	[PF_PPPOX] = "PF_PPPOX",
200	[PF_WANPIPE] = "PF_WANPIPE",
201	[PF_LLC] = "PF_LLC",
202	[PF_IB] = "PF_IB",
203	[PF_MPLS] = "PF_MPLS",
204	[PF_CAN] = "PF_CAN",
205	[PF_TIPC] = "PF_TIPC",
206	[PF_BLUETOOTH] = "PF_BLUETOOTH",
207	[PF_IUCV] = "PF_IUCV",
208	[PF_RXRPC] = "PF_RXRPC",
209	[PF_ISDN] = "PF_ISDN",
210	[PF_PHONET] = "PF_PHONET",
211	[PF_IEEE802154] = "PF_IEEE802154",
212	[PF_CAIF] = "PF_CAIF",
213	[PF_ALG] = "PF_ALG",
214	[PF_NFC] = "PF_NFC",
215	[PF_VSOCK] = "PF_VSOCK",
216	[PF_KCM] = "PF_KCM",
217	[PF_QIPCRTR] = "PF_QIPCRTR",
218	[PF_SMC] = "PF_SMC",
219	[PF_XDP] = "PF_XDP",
220	[PF_MCTP] = "PF_MCTP",
221	};
222
223	/*
224	* The protocol list. Each protocol is registered in here.
225	*/
226
227	static DEFINE_SPINLOCK(net_family_lock);
228	static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
229
230	/*
231	* Support routines.
232	* Move socket addresses back and forth across the kernel/user
233	* divide and look after the messy bits.
234	*/
235
236	/**
237	* move_addr_to_kernel - copy a socket address into kernel space
238	* @uaddr: Address in user space
239	* @kaddr: Address in kernel space
240	* @ulen: Length in user space
241	*
242	* The address is copied into kernel space. If the provided address is
243	* too long an error code of -EINVAL is returned. If the copy gives
244	* invalid addresses -EFAULT is returned. On a success 0 is returned.
245	*/
246
247	int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
248	{
249	if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
250	return -EINVAL;
251	if (ulen == 0)
252	return 0;
253	if (copy_from_user(to: kaddr, from: uaddr, n: ulen))
254	return -EFAULT;
255	return audit_sockaddr(len: ulen, addr: kaddr);
256	}
257
258	/**
259	* move_addr_to_user - copy an address to user space
260	* @kaddr: kernel space address
261	* @klen: length of address in kernel
262	* @uaddr: user space address
263	* @ulen: pointer to user length field
264	*
265	* The value pointed to by ulen on entry is the buffer length available.
266	* This is overwritten with the buffer space used. -EINVAL is returned
267	* if an overlong buffer is specified or a negative buffer size. -EFAULT
268	* is returned if either the buffer or the length field are not
269	* accessible.
270	* After copying the data up to the limit the user specifies, the true
271	* length of the data is written over the length limit the user
272	* specified. Zero is returned for a success.
273	*/
274
275	static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
276	void __user *uaddr, int __user *ulen)
277	{
278	int err;
279	int len;
280
281	BUG_ON(klen > sizeof(struct sockaddr_storage));
282	err = get_user(len, ulen);
283	if (err)
284	return err;
285	if (len > klen)
286	len = klen;
287	if (len < 0)
288	return -EINVAL;
289	if (len) {
290	if (audit_sockaddr(len: klen, addr: kaddr))
291	return -ENOMEM;
292	if (copy_to_user(to: uaddr, from: kaddr, n: len))
293	return -EFAULT;
294	}
295	/*
296	* "fromlen shall refer to the value before truncation.."
297	* 1003.1g
298	*/
299	return __put_user(klen, ulen);
300	}
301
302	static struct kmem_cache *sock_inode_cachep __ro_after_init;
303
304	static struct inode *sock_alloc_inode(struct super_block *sb)
305	{
306	struct socket_alloc *ei;
307
308	ei = alloc_inode_sb(sb, cache: sock_inode_cachep, GFP_KERNEL);
309	if (!ei)
310	return NULL;
311	init_waitqueue_head(&ei->socket.wq.wait);
312	ei->socket.wq.fasync_list = NULL;
313	ei->socket.wq.flags = 0;
314
315	ei->socket.state = SS_UNCONNECTED;
316	ei->socket.flags = 0;
317	ei->socket.ops = NULL;
318	ei->socket.sk = NULL;
319	ei->socket.file = NULL;
320
321	return &ei->vfs_inode;
322	}
323
324	static void sock_free_inode(struct inode *inode)
325	{
326	struct socket_alloc *ei;
327
328	ei = container_of(inode, struct socket_alloc, vfs_inode);
329	kmem_cache_free(s: sock_inode_cachep, objp: ei);
330	}
331
332	static void init_once(void *foo)
333	{
334	struct socket_alloc *ei = (struct socket_alloc *)foo;
335
336	inode_init_once(&ei->vfs_inode);
337	}
338
339	static void init_inodecache(void)
340	{
341	sock_inode_cachep = kmem_cache_create(name: "sock_inode_cache",
342	size: sizeof(struct socket_alloc),
343	align: 0,
344	flags: (SLAB_HWCACHE_ALIGN |
345	SLAB_RECLAIM_ACCOUNT |
346	SLAB_ACCOUNT),
347	ctor: init_once);
348	BUG_ON(sock_inode_cachep == NULL);
349	}
350
351	static const struct super_operations sockfs_ops = {
352	.alloc_inode = sock_alloc_inode,
353	.free_inode = sock_free_inode,
354	.statfs = simple_statfs,
355	};
356
357	/*
358	* sockfs_dname() is called from d_path().
359	*/
360	static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
361	{
362	return dynamic_dname(buffer, buflen, "socket:[%lu]",
363	d_inode(dentry)->i_ino);
364	}
365
366	static const struct dentry_operations sockfs_dentry_operations = {
367	.d_dname = sockfs_dname,
368	};
369
370	static int sockfs_xattr_get(const struct xattr_handler *handler,
371	struct dentry *dentry, struct inode *inode,
372	const char *suffix, void *value, size_t size)
373	{
374	if (value) {
375	if (dentry->d_name.len + 1 > size)
376	return -ERANGE;
377	memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
378	}
379	return dentry->d_name.len + 1;
380	}
381
382	#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
383	#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
384	#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
385
386	static const struct xattr_handler sockfs_xattr_handler = {
387	.name = XATTR_NAME_SOCKPROTONAME,
388	.get = sockfs_xattr_get,
389	};
390
391	static int sockfs_security_xattr_set(const struct xattr_handler *handler,
392	struct mnt_idmap *idmap,
393	struct dentry *dentry, struct inode *inode,
394	const char *suffix, const void *value,
395	size_t size, int flags)
396	{
397	/* Handled by LSM. */
398	return -EAGAIN;
399	}
400
401	static const struct xattr_handler sockfs_security_xattr_handler = {
402	.prefix = XATTR_SECURITY_PREFIX,
403	.set = sockfs_security_xattr_set,
404	};
405
406	static const struct xattr_handler * const sockfs_xattr_handlers[] = {
407	&sockfs_xattr_handler,
408	&sockfs_security_xattr_handler,
409	NULL
410	};
411
412	static int sockfs_init_fs_context(struct fs_context *fc)
413	{
414	struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
415	if (!ctx)
416	return -ENOMEM;
417	ctx->ops = &sockfs_ops;
418	ctx->dops = &sockfs_dentry_operations;
419	ctx->xattr = sockfs_xattr_handlers;
420	return 0;
421	}
422
423	static struct vfsmount *sock_mnt __read_mostly;
424
425	static struct file_system_type sock_fs_type = {
426	.name = "sockfs",
427	.init_fs_context = sockfs_init_fs_context,
428	.kill_sb = kill_anon_super,
429	};
430
431	/*
432	* Obtains the first available file descriptor and sets it up for use.
433	*
434	* These functions create file structures and maps them to fd space
435	* of the current process. On success it returns file descriptor
436	* and file struct implicitly stored in sock->file.
437	* Note that another thread may close file descriptor before we return
438	* from this function. We use the fact that now we do not refer
439	* to socket after mapping. If one day we will need it, this
440	* function will increment ref. count on file by 1.
441	*
442	* In any case returned fd MAY BE not valid!
443	* This race condition is unavoidable
444	* with shared fd spaces, we cannot solve it inside kernel,
445	* but we take care of internal coherence yet.
446	*/
447
448	/**
449	* sock_alloc_file - Bind a &socket to a &file
450	* @sock: socket
451	* @flags: file status flags
452	* @dname: protocol name
453	*
454	* Returns the &file bound with @sock, implicitly storing it
455	* in sock->file. If dname is %NULL, sets to "".
456	*
457	* On failure @sock is released, and an ERR pointer is returned.
458	*
459	* This function uses GFP_KERNEL internally.
460	*/
461
462	struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
463	{
464	struct file *file;
465
466	if (!dname)
467	dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
468
469	file = alloc_file_pseudo(SOCK_INODE(socket: sock), sock_mnt, dname,
470	O_RDWR | (flags & O_NONBLOCK),
471	&socket_file_ops);
472	if (IS_ERR(ptr: file)) {
473	sock_release(sock);
474	return file;
475	}
476
477	file->f_mode |= FMODE_NOWAIT;
478	sock->file = file;
479	file->private_data = sock;
480	stream_open(inode: SOCK_INODE(socket: sock), filp: file);
481	return file;
482	}
483	EXPORT_SYMBOL(sock_alloc_file);
484
485	static int sock_map_fd(struct socket *sock, int flags)
486	{
487	struct file *newfile;
488	int fd = get_unused_fd_flags(flags);
489	if (unlikely(fd < 0)) {
490	sock_release(sock);
491	return fd;
492	}
493
494	newfile = sock_alloc_file(sock, flags, NULL);
495	if (!IS_ERR(ptr: newfile)) {
496	fd_install(fd, file: newfile);
497	return fd;
498	}
499
500	put_unused_fd(fd);
501	return PTR_ERR(ptr: newfile);
502	}
503
504	/**
505	* sock_from_file - Return the &socket bounded to @file.
506	* @file: file
507	*
508	* On failure returns %NULL.
509	*/
510
511	struct socket *sock_from_file(struct file *file)
512	{
513	if (file->f_op == &socket_file_ops)
514	return file->private_data; /* set in sock_alloc_file */
515
516	return NULL;
517	}
518	EXPORT_SYMBOL(sock_from_file);
519
520	/**
521	* sockfd_lookup - Go from a file number to its socket slot
522	* @fd: file handle
523	* @err: pointer to an error code return
524	*
525	* The file handle passed in is locked and the socket it is bound
526	* to is returned. If an error occurs the err pointer is overwritten
527	* with a negative errno code and NULL is returned. The function checks
528	* for both invalid handles and passing a handle which is not a socket.
529	*
530	* On a success the socket object pointer is returned.
531	*/
532
533	struct socket *sockfd_lookup(int fd, int *err)
534	{
535	struct file *file;
536	struct socket *sock;
537
538	file = fget(fd);
539	if (!file) {
540	*err = -EBADF;
541	return NULL;
542	}
543
544	sock = sock_from_file(file);
545	if (!sock) {
546	*err = -ENOTSOCK;
547	fput(file);
548	}
549	return sock;
550	}
551	EXPORT_SYMBOL(sockfd_lookup);
552
553	static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
554	{
555	struct fd f = fdget(fd);
556	struct socket *sock;
557
558	*err = -EBADF;
559	if (f.file) {
560	sock = sock_from_file(f.file);
561	if (likely(sock)) {
562	*fput_needed = f.flags & FDPUT_FPUT;
563	return sock;
564	}
565	*err = -ENOTSOCK;
566	fdput(fd: f);
567	}
568	return NULL;
569	}
570
571	static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
572	size_t size)
573	{
574	ssize_t len;
575	ssize_t used = 0;
576
577	len = security_inode_listsecurity(inode: d_inode(dentry), buffer, buffer_size: size);
578	if (len < 0)
579	return len;
580	used += len;
581	if (buffer) {
582	if (size < used)
583	return -ERANGE;
584	buffer += len;
585	}
586
587	len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
588	used += len;
589	if (buffer) {
590	if (size < used)
591	return -ERANGE;
592	memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
593	buffer += len;
594	}
595
596	return used;
597	}
598
599	static int sockfs_setattr(struct mnt_idmap *idmap,
600	struct dentry *dentry, struct iattr *iattr)
601	{
602	int err = simple_setattr(&nop_mnt_idmap, dentry, iattr);
603
604	if (!err && (iattr->ia_valid & ATTR_UID)) {
605	struct socket *sock = SOCKET_I(inode: d_inode(dentry));
606
607	if (sock->sk)
608	sock->sk->sk_uid = iattr->ia_uid;
609	else
610	err = -ENOENT;
611	}
612
613	return err;
614	}
615
616	static const struct inode_operations sockfs_inode_ops = {
617	.listxattr = sockfs_listxattr,
618	.setattr = sockfs_setattr,
619	};
620
621	/**
622	* sock_alloc - allocate a socket
623	*
624	* Allocate a new inode and socket object. The two are bound together
625	* and initialised. The socket is then returned. If we are out of inodes
626	* NULL is returned. This functions uses GFP_KERNEL internally.
627	*/
628
629	struct socket *sock_alloc(void)
630	{
631	struct inode *inode;
632	struct socket *sock;
633
634	inode = new_inode_pseudo(sb: sock_mnt->mnt_sb);
635	if (!inode)
636	return NULL;
637
638	sock = SOCKET_I(inode);
639
640	inode->i_ino = get_next_ino();
641	inode->i_mode = S_IFSOCK | S_IRWXUGO;
642	inode->i_uid = current_fsuid();
643	inode->i_gid = current_fsgid();
644	inode->i_op = &sockfs_inode_ops;
645
646	return sock;
647	}
648	EXPORT_SYMBOL(sock_alloc);
649
650	static void __sock_release(struct socket *sock, struct inode *inode)
651	{
652	const struct proto_ops *ops = READ_ONCE(sock->ops);
653
654	if (ops) {
655	struct module *owner = ops->owner;
656
657	if (inode)
658	inode_lock(inode);
659	ops->release(sock);
660	sock->sk = NULL;
661	if (inode)
662	inode_unlock(inode);
663	sock->ops = NULL;
664	module_put(module: owner);
665	}
666
667	if (sock->wq.fasync_list)
668	pr_err("%s: fasync list not empty!\n", __func__);
669
670	if (!sock->file) {
671	iput(SOCK_INODE(socket: sock));
672	return;
673	}
674	sock->file = NULL;
675	}
676
677	/**
678	* sock_release - close a socket
679	* @sock: socket to close
680	*
681	* The socket is released from the protocol stack if it has a release
682	* callback, and the inode is then released if the socket is bound to
683	* an inode not a file.
684	*/
685	void sock_release(struct socket *sock)
686	{
687	__sock_release(sock, NULL);
688	}
689	EXPORT_SYMBOL(sock_release);
690
691	void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
692	{
693	u8 flags = *tx_flags;
694
695	if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) {
696	flags |= SKBTX_HW_TSTAMP;
697
698	/* PTP hardware clocks can provide a free running cycle counter
699	* as a time base for virtual clocks. Tell driver to use the
700	* free running cycle counter for timestamp if socket is bound
701	* to virtual clock.
702	*/
703	if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
704	flags |= SKBTX_HW_TSTAMP_USE_CYCLES;
705	}
706
707	if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
708	flags |= SKBTX_SW_TSTAMP;
709
710	if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
711	flags |= SKBTX_SCHED_TSTAMP;
712
713	*tx_flags = flags;
714	}
715	EXPORT_SYMBOL(__sock_tx_timestamp);
716
717	INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
718	size_t));
719	INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
720	size_t));
721
722	static noinline void call_trace_sock_send_length(struct sock *sk, int ret,
723	int flags)
724	{
725	trace_sock_send_length(sk, ret, flags: 0);
726	}
727
728	static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
729	{
730	int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->sendmsg, inet6_sendmsg,
731	inet_sendmsg, sock, msg,
732	msg_data_left(msg));
733	BUG_ON(ret == -EIOCBQUEUED);
734
735	if (trace_sock_send_length_enabled())
736	call_trace_sock_send_length(sk: sock->sk, ret, flags: 0);
737	return ret;
738	}
739
740	static int __sock_sendmsg(struct socket *sock, struct msghdr *msg)
741	{
742	int err = security_socket_sendmsg(sock, msg,
743	size: msg_data_left(msg));
744
745	return err ?: sock_sendmsg_nosec(sock, msg);
746	}
747
748	/**
749	* sock_sendmsg - send a message through @sock
750	* @sock: socket
751	* @msg: message to send
752	*
753	* Sends @msg through @sock, passing through LSM.
754	* Returns the number of bytes sent, or an error code.
755	*/
756	int sock_sendmsg(struct socket *sock, struct msghdr *msg)
757	{
758	struct sockaddr_storage *save_addr = (struct sockaddr_storage *)msg->msg_name;
759	struct sockaddr_storage address;
760	int save_len = msg->msg_namelen;
761	int ret;
762
763	if (msg->msg_name) {
764	memcpy(&address, msg->msg_name, msg->msg_namelen);
765	msg->msg_name = &address;
766	}
767
768	ret = __sock_sendmsg(sock, msg);
769	msg->msg_name = save_addr;
770	msg->msg_namelen = save_len;
771
772	return ret;
773	}
774	EXPORT_SYMBOL(sock_sendmsg);
775
776	/**
777	* kernel_sendmsg - send a message through @sock (kernel-space)
778	* @sock: socket
779	* @msg: message header
780	* @vec: kernel vec
781	* @num: vec array length
782	* @size: total message data size
783	*
784	* Builds the message data with @vec and sends it through @sock.
785	* Returns the number of bytes sent, or an error code.
786	*/
787
788	int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
789	struct kvec *vec, size_t num, size_t size)
790	{
791	iov_iter_kvec(i: &msg->msg_iter, ITER_SOURCE, kvec: vec, nr_segs: num, count: size);
792	return sock_sendmsg(sock, msg);
793	}
794	EXPORT_SYMBOL(kernel_sendmsg);
795
796	/**
797	* kernel_sendmsg_locked - send a message through @sock (kernel-space)
798	* @sk: sock
799	* @msg: message header
800	* @vec: output s/g array
801	* @num: output s/g array length
802	* @size: total message data size
803	*
804	* Builds the message data with @vec and sends it through @sock.
805	* Returns the number of bytes sent, or an error code.
806	* Caller must hold @sk.
807	*/
808
809	int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
810	struct kvec *vec, size_t num, size_t size)
811	{
812	struct socket *sock = sk->sk_socket;
813	const struct proto_ops *ops = READ_ONCE(sock->ops);
814
815	if (!ops->sendmsg_locked)
816	return sock_no_sendmsg_locked(sk, msg, len: size);
817
818	iov_iter_kvec(i: &msg->msg_iter, ITER_SOURCE, kvec: vec, nr_segs: num, count: size);
819
820	return ops->sendmsg_locked(sk, msg, msg_data_left(msg));
821	}
822	EXPORT_SYMBOL(kernel_sendmsg_locked);
823
824	static bool skb_is_err_queue(const struct sk_buff *skb)
825	{
826	/* pkt_type of skbs enqueued on the error queue are set to
827	* PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
828	* in recvmsg, since skbs received on a local socket will never
829	* have a pkt_type of PACKET_OUTGOING.
830	*/
831	return skb->pkt_type == PACKET_OUTGOING;
832	}
833
834	/* On transmit, software and hardware timestamps are returned independently.
835	* As the two skb clones share the hardware timestamp, which may be updated
836	* before the software timestamp is received, a hardware TX timestamp may be
837	* returned only if there is no software TX timestamp. Ignore false software
838	* timestamps, which may be made in the __sock_recv_timestamp() call when the
839	* option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
840	* hardware timestamp.
841	*/
842	static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
843	{
844	return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
845	}
846
847	static ktime_t get_timestamp(struct sock *sk, struct sk_buff *skb, int *if_index)
848	{
849	bool cycles = READ_ONCE(sk->sk_tsflags) & SOF_TIMESTAMPING_BIND_PHC;
850	struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
851	struct net_device *orig_dev;
852	ktime_t hwtstamp;
853
854	rcu_read_lock();
855	orig_dev = dev_get_by_napi_id(napi_id: skb_napi_id(skb));
856	if (orig_dev) {
857	*if_index = orig_dev->ifindex;
858	hwtstamp = netdev_get_tstamp(dev: orig_dev, hwtstamps: shhwtstamps, cycles);
859	} else {
860	hwtstamp = shhwtstamps->hwtstamp;
861	}
862	rcu_read_unlock();
863
864	return hwtstamp;
865	}
866
867	static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb,
868	int if_index)
869	{
870	struct scm_ts_pktinfo ts_pktinfo;
871	struct net_device *orig_dev;
872
873	if (!skb_mac_header_was_set(skb))
874	return;
875
876	memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
877
878	if (!if_index) {
879	rcu_read_lock();
880	orig_dev = dev_get_by_napi_id(napi_id: skb_napi_id(skb));
881	if (orig_dev)
882	if_index = orig_dev->ifindex;
883	rcu_read_unlock();
884	}
885	ts_pktinfo.if_index = if_index;
886
887	ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
888	put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
889	len: sizeof(ts_pktinfo), data: &ts_pktinfo);
890	}
891
892	/*
893	* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
894	*/
895	void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
896	struct sk_buff *skb)
897	{
898	int need_software_tstamp = sock_flag(sk, flag: SOCK_RCVTSTAMP);
899	int new_tstamp = sock_flag(sk, flag: SOCK_TSTAMP_NEW);
900	struct scm_timestamping_internal tss;
901	int empty = 1, false_tstamp = 0;
902	struct skb_shared_hwtstamps *shhwtstamps =
903	skb_hwtstamps(skb);
904	int if_index;
905	ktime_t hwtstamp;
906	u32 tsflags;
907
908	/* Race occurred between timestamp enabling and packet
909	receiving. Fill in the current time for now. */
910	if (need_software_tstamp && skb->tstamp == 0) {
911	__net_timestamp(skb);
912	false_tstamp = 1;
913	}
914
915	if (need_software_tstamp) {
916	if (!sock_flag(sk, flag: SOCK_RCVTSTAMPNS)) {
917	if (new_tstamp) {
918	struct __kernel_sock_timeval tv;
919
920	skb_get_new_timestamp(skb, stamp: &tv);
921	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
922	len: sizeof(tv), data: &tv);
923	} else {
924	struct __kernel_old_timeval tv;
925
926	skb_get_timestamp(skb, stamp: &tv);
927	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
928	len: sizeof(tv), data: &tv);
929	}
930	} else {
931	if (new_tstamp) {
932	struct __kernel_timespec ts;
933
934	skb_get_new_timestampns(skb, stamp: &ts);
935	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
936	len: sizeof(ts), data: &ts);
937	} else {
938	struct __kernel_old_timespec ts;
939
940	skb_get_timestampns(skb, stamp: &ts);
941	put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
942	len: sizeof(ts), data: &ts);
943	}
944	}
945	}
946
947	memset(&tss, 0, sizeof(tss));
948	tsflags = READ_ONCE(sk->sk_tsflags);
949	if ((tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
950	ktime_to_timespec64_cond(kt: skb->tstamp, ts: tss.ts + 0))
951	empty = 0;
952	if (shhwtstamps &&
953	(tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
954	!skb_is_swtx_tstamp(skb, false_tstamp)) {
955	if_index = 0;
956	if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP_NETDEV)
957	hwtstamp = get_timestamp(sk, skb, if_index: &if_index);
958	else
959	hwtstamp = shhwtstamps->hwtstamp;
960
961	if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
962	hwtstamp = ptp_convert_timestamp(hwtstamp: &hwtstamp,
963	READ_ONCE(sk->sk_bind_phc));
964
965	if (ktime_to_timespec64_cond(kt: hwtstamp, ts: tss.ts + 2)) {
966	empty = 0;
967
968	if ((tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
969	!skb_is_err_queue(skb))
970	put_ts_pktinfo(msg, skb, if_index);
971	}
972	}
973	if (!empty) {
974	if (sock_flag(sk, flag: SOCK_TSTAMP_NEW))
975	put_cmsg_scm_timestamping64(msg, tss: &tss);
976	else
977	put_cmsg_scm_timestamping(msg, tss: &tss);
978
979	if (skb_is_err_queue(skb) && skb->len &&
980	SKB_EXT_ERR(skb)->opt_stats)
981	put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
982	len: skb->len, data: skb->data);
983	}
984	}
985	EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
986
987	#ifdef CONFIG_WIRELESS
988	void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
989	struct sk_buff *skb)
990	{
991	int ack;
992
993	if (!sock_flag(sk, flag: SOCK_WIFI_STATUS))
994	return;
995	if (!skb->wifi_acked_valid)
996	return;
997
998	ack = skb->wifi_acked;
999
1000	put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, len: sizeof(ack), data: &ack);
1001	}
1002	EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
1003	#endif
1004
1005	static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
1006	struct sk_buff *skb)
1007	{
1008	if (sock_flag(sk, flag: SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
1009	put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
1010	len: sizeof(__u32), data: &SOCK_SKB_CB(skb)->dropcount);
1011	}
1012
1013	static void sock_recv_mark(struct msghdr *msg, struct sock *sk,
1014	struct sk_buff *skb)
1015	{
1016	if (sock_flag(sk, flag: SOCK_RCVMARK) && skb) {
1017	/* We must use a bounce buffer for CONFIG_HARDENED_USERCOPY=y */
1018	__u32 mark = skb->mark;
1019
1020	put_cmsg(msg, SOL_SOCKET, SO_MARK, len: sizeof(__u32), data: &mark);
1021	}
1022	}
1023
1024	void __sock_recv_cmsgs(struct msghdr *msg, struct sock *sk,
1025	struct sk_buff *skb)
1026	{
1027	sock_recv_timestamp(msg, sk, skb);
1028	sock_recv_drops(msg, sk, skb);
1029	sock_recv_mark(msg, sk, skb);
1030	}
1031	EXPORT_SYMBOL_GPL(__sock_recv_cmsgs);
1032
1033	INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
1034	size_t, int));
1035	INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
1036	size_t, int));
1037
1038	static noinline void call_trace_sock_recv_length(struct sock *sk, int ret, int flags)
1039	{
1040	trace_sock_recv_length(sk, ret, flags);
1041	}
1042
1043	static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
1044	int flags)
1045	{
1046	int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->recvmsg,
1047	inet6_recvmsg,
1048	inet_recvmsg, sock, msg,
1049	msg_data_left(msg), flags);
1050	if (trace_sock_recv_length_enabled())
1051	call_trace_sock_recv_length(sk: sock->sk, ret, flags);
1052	return ret;
1053	}
1054
1055	/**
1056	* sock_recvmsg - receive a message from @sock
1057	* @sock: socket
1058	* @msg: message to receive
1059	* @flags: message flags
1060	*
1061	* Receives @msg from @sock, passing through LSM. Returns the total number
1062	* of bytes received, or an error.
1063	*/
1064	int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
1065	{
1066	int err = security_socket_recvmsg(sock, msg, size: msg_data_left(msg), flags);
1067
1068	return err ?: sock_recvmsg_nosec(sock, msg, flags);
1069	}
1070	EXPORT_SYMBOL(sock_recvmsg);
1071
1072	/**
1073	* kernel_recvmsg - Receive a message from a socket (kernel space)
1074	* @sock: The socket to receive the message from
1075	* @msg: Received message
1076	* @vec: Input s/g array for message data
1077	* @num: Size of input s/g array
1078	* @size: Number of bytes to read
1079	* @flags: Message flags (MSG_DONTWAIT, etc...)
1080	*
1081	* On return the msg structure contains the scatter/gather array passed in the
1082	* vec argument. The array is modified so that it consists of the unfilled
1083	* portion of the original array.
1084	*
1085	* The returned value is the total number of bytes received, or an error.
1086	*/
1087
1088	int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
1089	struct kvec *vec, size_t num, size_t size, int flags)
1090	{
1091	msg->msg_control_is_user = false;
1092	iov_iter_kvec(i: &msg->msg_iter, ITER_DEST, kvec: vec, nr_segs: num, count: size);
1093	return sock_recvmsg(sock, msg, flags);
1094	}
1095	EXPORT_SYMBOL(kernel_recvmsg);
1096
1097	static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
1098	struct pipe_inode_info *pipe, size_t len,
1099	unsigned int flags)
1100	{
1101	struct socket *sock = file->private_data;
1102	const struct proto_ops *ops;
1103
1104	ops = READ_ONCE(sock->ops);
1105	if (unlikely(!ops->splice_read))
1106	return copy_splice_read(in: file, ppos, pipe, len, flags);
1107
1108	return ops->splice_read(sock, ppos, pipe, len, flags);
1109	}
1110
1111	static void sock_splice_eof(struct file *file)
1112	{
1113	struct socket *sock = file->private_data;
1114	const struct proto_ops *ops;
1115
1116	ops = READ_ONCE(sock->ops);
1117	if (ops->splice_eof)
1118	ops->splice_eof(sock);
1119	}
1120
1121	static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
1122	{
1123	struct file *file = iocb->ki_filp;
1124	struct socket *sock = file->private_data;
1125	struct msghdr msg = {.msg_iter = *to,
1126	.msg_iocb = iocb};
1127	ssize_t res;
1128
1129	if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
1130	msg.msg_flags = MSG_DONTWAIT;
1131
1132	if (iocb->ki_pos != 0)
1133	return -ESPIPE;
1134
1135	if (!iov_iter_count(i: to)) /* Match SYS5 behaviour */
1136	return 0;
1137
1138	res = sock_recvmsg(sock, &msg, msg.msg_flags);
1139	*to = msg.msg_iter;
1140	return res;
1141	}
1142
1143	static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
1144	{
1145	struct file *file = iocb->ki_filp;
1146	struct socket *sock = file->private_data;
1147	struct msghdr msg = {.msg_iter = *from,
1148	.msg_iocb = iocb};
1149	ssize_t res;
1150
1151	if (iocb->ki_pos != 0)
1152	return -ESPIPE;
1153
1154	if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
1155	msg.msg_flags = MSG_DONTWAIT;
1156
1157	if (sock->type == SOCK_SEQPACKET)
1158	msg.msg_flags |= MSG_EOR;
1159
1160	res = __sock_sendmsg(sock, msg: &msg);
1161	*from = msg.msg_iter;
1162	return res;
1163	}
1164
1165	/*
1166	* Atomic setting of ioctl hooks to avoid race
1167	* with module unload.
1168	*/
1169
1170	static DEFINE_MUTEX(br_ioctl_mutex);
1171	static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br,
1172	unsigned int cmd, struct ifreq *ifr,
1173	void __user *uarg);
1174
1175	void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
1176	unsigned int cmd, struct ifreq *ifr,
1177	void __user *uarg))
1178	{
1179	mutex_lock(&br_ioctl_mutex);
1180	br_ioctl_hook = hook;
1181	mutex_unlock(lock: &br_ioctl_mutex);
1182	}
1183	EXPORT_SYMBOL(brioctl_set);
1184
1185	int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
1186	struct ifreq *ifr, void __user *uarg)
1187	{
1188	int err = -ENOPKG;
1189
1190	if (!br_ioctl_hook)
1191	request_module("bridge");
1192
1193	mutex_lock(&br_ioctl_mutex);
1194	if (br_ioctl_hook)
1195	err = br_ioctl_hook(net, br, cmd, ifr, uarg);
1196	mutex_unlock(lock: &br_ioctl_mutex);
1197
1198	return err;
1199	}
1200
1201	static DEFINE_MUTEX(vlan_ioctl_mutex);
1202	static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
1203
1204	void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
1205	{
1206	mutex_lock(&vlan_ioctl_mutex);
1207	vlan_ioctl_hook = hook;
1208	mutex_unlock(lock: &vlan_ioctl_mutex);
1209	}
1210	EXPORT_SYMBOL(vlan_ioctl_set);
1211
1212	static long sock_do_ioctl(struct net *net, struct socket *sock,
1213	unsigned int cmd, unsigned long arg)
1214	{
1215	const struct proto_ops *ops = READ_ONCE(sock->ops);
1216	struct ifreq ifr;
1217	bool need_copyout;
1218	int err;
1219	void __user *argp = (void __user *)arg;
1220	void __user *data;
1221
1222	err = ops->ioctl(sock, cmd, arg);
1223
1224	/*
1225	* If this ioctl is unknown try to hand it down
1226	* to the NIC driver.
1227	*/
1228	if (err != -ENOIOCTLCMD)
1229	return err;
1230
1231	if (!is_socket_ioctl_cmd(cmd))
1232	return -ENOTTY;
1233
1234	if (get_user_ifreq(ifr: &ifr, ifrdata: &data, arg: argp))
1235	return -EFAULT;
1236	err = dev_ioctl(net, cmd, ifr: &ifr, data, need_copyout: &need_copyout);
1237	if (!err && need_copyout)
1238	if (put_user_ifreq(ifr: &ifr, arg: argp))
1239	return -EFAULT;
1240
1241	return err;
1242	}
1243
1244	/*
1245	* With an ioctl, arg may well be a user mode pointer, but we don't know
1246	* what to do with it - that's up to the protocol still.
1247	*/
1248
1249	static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1250	{
1251	const struct proto_ops *ops;
1252	struct socket *sock;
1253	struct sock *sk;
1254	void __user *argp = (void __user *)arg;
1255	int pid, err;
1256	struct net *net;
1257
1258	sock = file->private_data;
1259	ops = READ_ONCE(sock->ops);
1260	sk = sock->sk;
1261	net = sock_net(sk);
1262	if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1263	struct ifreq ifr;
1264	void __user *data;
1265	bool need_copyout;
1266	if (get_user_ifreq(ifr: &ifr, ifrdata: &data, arg: argp))
1267	return -EFAULT;
1268	err = dev_ioctl(net, cmd, ifr: &ifr, data, need_copyout: &need_copyout);
1269	if (!err && need_copyout)
1270	if (put_user_ifreq(ifr: &ifr, arg: argp))
1271	return -EFAULT;
1272	} else
1273	#ifdef CONFIG_WEXT_CORE
1274	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1275	err = wext_handle_ioctl(net, cmd, arg: argp);
1276	} else
1277	#endif
1278	switch (cmd) {
1279	case FIOSETOWN:
1280	case SIOCSPGRP:
1281	err = -EFAULT;
1282	if (get_user(pid, (int __user *)argp))
1283	break;
1284	err = f_setown(filp: sock->file, who: pid, force: 1);
1285	break;
1286	case FIOGETOWN:
1287	case SIOCGPGRP:
1288	err = put_user(f_getown(sock->file),
1289	(int __user *)argp);
1290	break;
1291	case SIOCGIFBR:
1292	case SIOCSIFBR:
1293	case SIOCBRADDBR:
1294	case SIOCBRDELBR:
1295	err = br_ioctl_call(net, NULL, cmd, NULL, uarg: argp);
1296	break;
1297	case SIOCGIFVLAN:
1298	case SIOCSIFVLAN:
1299	err = -ENOPKG;
1300	if (!vlan_ioctl_hook)
1301	request_module("8021q");
1302
1303	mutex_lock(&vlan_ioctl_mutex);
1304	if (vlan_ioctl_hook)
1305	err = vlan_ioctl_hook(net, argp);
1306	mutex_unlock(lock: &vlan_ioctl_mutex);
1307	break;
1308	case SIOCGSKNS:
1309	err = -EPERM;
1310	if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
1311	break;
1312
1313	err = open_related_ns(ns: &net->ns, get_ns: get_net_ns);
1314	break;
1315	case SIOCGSTAMP_OLD:
1316	case SIOCGSTAMPNS_OLD:
1317	if (!ops->gettstamp) {
1318	err = -ENOIOCTLCMD;
1319	break;
1320	}
1321	err = ops->gettstamp(sock, argp,
1322	cmd == SIOCGSTAMP_OLD,
1323	!IS_ENABLED(CONFIG_64BIT));
1324	break;
1325	case SIOCGSTAMP_NEW:
1326	case SIOCGSTAMPNS_NEW:
1327	if (!ops->gettstamp) {
1328	err = -ENOIOCTLCMD;
1329	break;
1330	}
1331	err = ops->gettstamp(sock, argp,
1332	cmd == SIOCGSTAMP_NEW,
1333	false);
1334	break;
1335
1336	case SIOCGIFCONF:
1337	err = dev_ifconf(net, ifc: argp);
1338	break;
1339
1340	default:
1341	err = sock_do_ioctl(net, sock, cmd, arg);
1342	break;
1343	}
1344	return err;
1345	}
1346
1347	/**
1348	* sock_create_lite - creates a socket
1349	* @family: protocol family (AF_INET, ...)
1350	* @type: communication type (SOCK_STREAM, ...)
1351	* @protocol: protocol (0, ...)
1352	* @res: new socket
1353	*
1354	* Creates a new socket and assigns it to @res, passing through LSM.
1355	* The new socket initialization is not complete, see kernel_accept().
1356	* Returns 0 or an error. On failure @res is set to %NULL.
1357	* This function internally uses GFP_KERNEL.
1358	*/
1359
1360	int sock_create_lite(int family, int type, int protocol, struct socket **res)
1361	{
1362	int err;
1363	struct socket *sock = NULL;
1364
1365	err = security_socket_create(family, type, protocol, kern: 1);
1366	if (err)
1367	goto out;
1368
1369	sock = sock_alloc();
1370	if (!sock) {
1371	err = -ENOMEM;
1372	goto out;
1373	}
1374
1375	sock->type = type;
1376	err = security_socket_post_create(sock, family, type, protocol, kern: 1);
1377	if (err)
1378	goto out_release;
1379
1380	out:
1381	*res = sock;
1382	return err;
1383	out_release:
1384	sock_release(sock);
1385	sock = NULL;
1386	goto out;
1387	}
1388	EXPORT_SYMBOL(sock_create_lite);
1389
1390	/* No kernel lock held - perfect */
1391	static __poll_t sock_poll(struct file *file, poll_table *wait)
1392	{
1393	struct socket *sock = file->private_data;
1394	const struct proto_ops *ops = READ_ONCE(sock->ops);
1395	__poll_t events = poll_requested_events(p: wait), flag = 0;
1396
1397	if (!ops->poll)
1398	return 0;
1399
1400	if (sk_can_busy_loop(sk: sock->sk)) {
1401	/* poll once if requested by the syscall */
1402	if (events & POLL_BUSY_LOOP)
1403	sk_busy_loop(sk: sock->sk, nonblock: 1);
1404
1405	/* if this socket can poll_ll, tell the system call */
1406	flag = POLL_BUSY_LOOP;
1407	}
1408
1409	return ops->poll(file, sock, wait) | flag;
1410	}
1411
1412	static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1413	{
1414	struct socket *sock = file->private_data;
1415
1416	return READ_ONCE(sock->ops)->mmap(file, sock, vma);
1417	}
1418
1419	static int sock_close(struct inode *inode, struct file *filp)
1420	{
1421	__sock_release(sock: SOCKET_I(inode), inode);
1422	return 0;
1423	}
1424
1425	/*
1426	* Update the socket async list
1427	*
1428	* Fasync_list locking strategy.
1429	*
1430	* 1. fasync_list is modified only under process context socket lock
1431	* i.e. under semaphore.
1432	* 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1433	* or under socket lock
1434	*/
1435
1436	static int sock_fasync(int fd, struct file *filp, int on)
1437	{
1438	struct socket *sock = filp->private_data;
1439	struct sock *sk = sock->sk;
1440	struct socket_wq *wq = &sock->wq;
1441
1442	if (sk == NULL)
1443	return -EINVAL;
1444
1445	lock_sock(sk);
1446	fasync_helper(fd, filp, on, &wq->fasync_list);
1447
1448	if (!wq->fasync_list)
1449	sock_reset_flag(sk, flag: SOCK_FASYNC);
1450	else
1451	sock_set_flag(sk, flag: SOCK_FASYNC);
1452
1453	release_sock(sk);
1454	return 0;
1455	}
1456
1457	/* This function may be called only under rcu_lock */
1458
1459	int sock_wake_async(struct socket_wq *wq, int how, int band)
1460	{
1461	if (!wq || !wq->fasync_list)
1462	return -1;
1463
1464	switch (how) {
1465	case SOCK_WAKE_WAITD:
1466	if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
1467	break;
1468	goto call_kill;
1469	case SOCK_WAKE_SPACE:
1470	if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, addr: &wq->flags))
1471	break;
1472	fallthrough;
1473	case SOCK_WAKE_IO:
1474	call_kill:
1475	kill_fasync(&wq->fasync_list, SIGIO, band);
1476	break;
1477	case SOCK_WAKE_URG:
1478	kill_fasync(&wq->fasync_list, SIGURG, band);
1479	}
1480
1481	return 0;
1482	}
1483	EXPORT_SYMBOL(sock_wake_async);
1484
1485	/**
1486	* __sock_create - creates a socket
1487	* @net: net namespace
1488	* @family: protocol family (AF_INET, ...)
1489	* @type: communication type (SOCK_STREAM, ...)
1490	* @protocol: protocol (0, ...)
1491	* @res: new socket
1492	* @kern: boolean for kernel space sockets
1493	*
1494	* Creates a new socket and assigns it to @res, passing through LSM.
1495	* Returns 0 or an error. On failure @res is set to %NULL. @kern must
1496	* be set to true if the socket resides in kernel space.
1497	* This function internally uses GFP_KERNEL.
1498	*/
1499
1500	int __sock_create(struct net *net, int family, int type, int protocol,
1501	struct socket **res, int kern)
1502	{
1503	int err;
1504	struct socket *sock;
1505	const struct net_proto_family *pf;
1506
1507	/*
1508	* Check protocol is in range
1509	*/
1510	if (family < 0 || family >= NPROTO)
1511	return -EAFNOSUPPORT;
1512	if (type < 0 || type >= SOCK_MAX)
1513	return -EINVAL;
1514
1515	/* Compatibility.
1516
1517	This uglymoron is moved from INET layer to here to avoid
1518	deadlock in module load.
1519	*/
1520	if (family == PF_INET && type == SOCK_PACKET) {
1521	pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1522	current->comm);
1523	family = PF_PACKET;
1524	}
1525
1526	err = security_socket_create(family, type, protocol, kern);
1527	if (err)
1528	return err;
1529
1530	/*
1531	* Allocate the socket and allow the family to set things up. if
1532	* the protocol is 0, the family is instructed to select an appropriate
1533	* default.
1534	*/
1535	sock = sock_alloc();
1536	if (!sock) {
1537	net_warn_ratelimited("socket: no more sockets\n");
1538	return -ENFILE; /* Not exactly a match, but its the
1539	closest posix thing */
1540	}
1541
1542	sock->type = type;
1543
1544	#ifdef CONFIG_MODULES
1545	/* Attempt to load a protocol module if the find failed.
1546	*
1547	* 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1548	* requested real, full-featured networking support upon configuration.
1549	* Otherwise module support will break!
1550	*/
1551	if (rcu_access_pointer(net_families[family]) == NULL)
1552	request_module("net-pf-%d", family);
1553	#endif
1554
1555	rcu_read_lock();
1556	pf = rcu_dereference(net_families[family]);
1557	err = -EAFNOSUPPORT;
1558	if (!pf)
1559	goto out_release;
1560
1561	/*
1562	* We will call the ->create function, that possibly is in a loadable
1563	* module, so we have to bump that loadable module refcnt first.
1564	*/
1565	if (!try_module_get(module: pf->owner))
1566	goto out_release;
1567
1568	/* Now protected by module ref count */
1569	rcu_read_unlock();
1570
1571	err = pf->create(net, sock, protocol, kern);
1572	if (err < 0)
1573	goto out_module_put;
1574
1575	/*
1576	* Now to bump the refcnt of the [loadable] module that owns this
1577	* socket at sock_release time we decrement its refcnt.
1578	*/
1579	if (!try_module_get(module: sock->ops->owner))
1580	goto out_module_busy;
1581
1582	/*
1583	* Now that we're done with the ->create function, the [loadable]
1584	* module can have its refcnt decremented
1585	*/
1586	module_put(module: pf->owner);
1587	err = security_socket_post_create(sock, family, type, protocol, kern);
1588	if (err)
1589	goto out_sock_release;
1590	*res = sock;
1591
1592	return 0;
1593
1594	out_module_busy:
1595	err = -EAFNOSUPPORT;
1596	out_module_put:
1597	sock->ops = NULL;
1598	module_put(module: pf->owner);
1599	out_sock_release:
1600	sock_release(sock);
1601	return err;
1602
1603	out_release:
1604	rcu_read_unlock();
1605	goto out_sock_release;
1606	}
1607	EXPORT_SYMBOL(__sock_create);
1608
1609	/**
1610	* sock_create - creates a socket
1611	* @family: protocol family (AF_INET, ...)
1612	* @type: communication type (SOCK_STREAM, ...)
1613	* @protocol: protocol (0, ...)
1614	* @res: new socket
1615	*
1616	* A wrapper around __sock_create().
1617	* Returns 0 or an error. This function internally uses GFP_KERNEL.
1618	*/
1619
1620	int sock_create(int family, int type, int protocol, struct socket **res)
1621	{
1622	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1623	}
1624	EXPORT_SYMBOL(sock_create);
1625
1626	/**
1627	* sock_create_kern - creates a socket (kernel space)
1628	* @net: net namespace
1629	* @family: protocol family (AF_INET, ...)
1630	* @type: communication type (SOCK_STREAM, ...)
1631	* @protocol: protocol (0, ...)
1632	* @res: new socket
1633	*
1634	* A wrapper around __sock_create().
1635	* Returns 0 or an error. This function internally uses GFP_KERNEL.
1636	*/
1637
1638	int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
1639	{
1640	return __sock_create(net, family, type, protocol, res, 1);
1641	}
1642	EXPORT_SYMBOL(sock_create_kern);
1643
1644	static struct socket *__sys_socket_create(int family, int type, int protocol)
1645	{
1646	struct socket *sock;
1647	int retval;
1648
1649	/* Check the SOCK_* constants for consistency. */
1650	BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1651	BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1652	BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1653	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1654
1655	if ((type & ~SOCK_TYPE_MASK) & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1656	return ERR_PTR(error: -EINVAL);
1657	type &= SOCK_TYPE_MASK;
1658
1659	retval = sock_create(family, type, protocol, &sock);
1660	if (retval < 0)
1661	return ERR_PTR(error: retval);
1662
1663	return sock;
1664	}
1665
1666	struct file *__sys_socket_file(int family, int type, int protocol)
1667	{
1668	struct socket *sock;
1669	int flags;
1670
1671	sock = __sys_socket_create(family, type, protocol);
1672	if (IS_ERR(ptr: sock))
1673	return ERR_CAST(ptr: sock);
1674
1675	flags = type & ~SOCK_TYPE_MASK;
1676	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1677	flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1678
1679	return sock_alloc_file(sock, flags, NULL);
1680	}
1681
1682	/* A hook for bpf progs to attach to and update socket protocol.
1683	*
1684	* A static noinline declaration here could cause the compiler to
1685	* optimize away the function. A global noinline declaration will
1686	* keep the definition, but may optimize away the callsite.
1687	* Therefore, __weak is needed to ensure that the call is still
1688	* emitted, by telling the compiler that we don't know what the
1689	* function might eventually be.
1690	*/
1691
1692	__bpf_hook_start();
1693
1694	__weak noinline int update_socket_protocol(int family, int type, int protocol)
1695	{
1696	return protocol;
1697	}
1698
1699	__bpf_hook_end();
1700
1701	int __sys_socket(int family, int type, int protocol)
1702	{
1703	struct socket *sock;
1704	int flags;
1705
1706	sock = __sys_socket_create(family, type,
1707	protocol: update_socket_protocol(family, type, protocol));
1708	if (IS_ERR(ptr: sock))
1709	return PTR_ERR(ptr: sock);
1710
1711	flags = type & ~SOCK_TYPE_MASK;
1712	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1713	flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1714
1715	return sock_map_fd(sock, flags: flags & (O_CLOEXEC | O_NONBLOCK));
1716	}
1717
1718	SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1719	{
1720	return __sys_socket(family, type, protocol);
1721	}
1722
1723	/*
1724	* Create a pair of connected sockets.
1725	*/
1726
1727	int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
1728	{
1729	struct socket *sock1, *sock2;
1730	int fd1, fd2, err;
1731	struct file *newfile1, *newfile2;
1732	int flags;
1733
1734	flags = type & ~SOCK_TYPE_MASK;
1735	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1736	return -EINVAL;
1737	type &= SOCK_TYPE_MASK;
1738
1739	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1740	flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1741
1742	/*
1743	* reserve descriptors and make sure we won't fail
1744	* to return them to userland.
1745	*/
1746	fd1 = get_unused_fd_flags(flags);
1747	if (unlikely(fd1 < 0))
1748	return fd1;
1749
1750	fd2 = get_unused_fd_flags(flags);
1751	if (unlikely(fd2 < 0)) {
1752	put_unused_fd(fd: fd1);
1753	return fd2;
1754	}
1755
1756	err = put_user(fd1, &usockvec[0]);
1757	if (err)
1758	goto out;
1759
1760	err = put_user(fd2, &usockvec[1]);
1761	if (err)
1762	goto out;
1763
1764	/*
1765	* Obtain the first socket and check if the underlying protocol
1766	* supports the socketpair call.
1767	*/
1768
1769	err = sock_create(family, type, protocol, &sock1);
1770	if (unlikely(err < 0))
1771	goto out;
1772
1773	err = sock_create(family, type, protocol, &sock2);
1774	if (unlikely(err < 0)) {
1775	sock_release(sock1);
1776	goto out;
1777	}
1778
1779	err = security_socket_socketpair(socka: sock1, sockb: sock2);
1780	if (unlikely(err)) {
1781	sock_release(sock2);
1782	sock_release(sock1);
1783	goto out;
1784	}
1785
1786	err = READ_ONCE(sock1->ops)->socketpair(sock1, sock2);
1787	if (unlikely(err < 0)) {
1788	sock_release(sock2);
1789	sock_release(sock1);
1790	goto out;
1791	}
1792
1793	newfile1 = sock_alloc_file(sock1, flags, NULL);
1794	if (IS_ERR(ptr: newfile1)) {
1795	err = PTR_ERR(ptr: newfile1);
1796	sock_release(sock2);
1797	goto out;
1798	}
1799
1800	newfile2 = sock_alloc_file(sock2, flags, NULL);
1801	if (IS_ERR(ptr: newfile2)) {
1802	err = PTR_ERR(ptr: newfile2);
1803	fput(newfile1);
1804	goto out;
1805	}
1806
1807	audit_fd_pair(fd1, fd2);
1808
1809	fd_install(fd: fd1, file: newfile1);
1810	fd_install(fd: fd2, file: newfile2);
1811	return 0;
1812
1813	out:
1814	put_unused_fd(fd: fd2);
1815	put_unused_fd(fd: fd1);
1816	return err;
1817	}
1818
1819	SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1820	int __user *, usockvec)
1821	{
1822	return __sys_socketpair(family, type, protocol, usockvec);
1823	}
1824
1825	/*
1826	* Bind a name to a socket. Nothing much to do here since it's
1827	* the protocol's responsibility to handle the local address.
1828	*
1829	* We move the socket address to kernel space before we call
1830	* the protocol layer (having also checked the address is ok).
1831	*/
1832
1833	int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1834	{
1835	struct socket *sock;
1836	struct sockaddr_storage address;
1837	int err, fput_needed;
1838
1839	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
1840	if (sock) {
1841	err = move_addr_to_kernel(uaddr: umyaddr, ulen: addrlen, kaddr: &address);
1842	if (!err) {
1843	err = security_socket_bind(sock,
1844	address: (struct sockaddr *)&address,
1845	addrlen);
1846	if (!err)
1847	err = READ_ONCE(sock->ops)->bind(sock,
1848	(struct sockaddr *)
1849	&address, addrlen);
1850	}
1851	fput_light(file: sock->file, fput_needed);
1852	}
1853	return err;
1854	}
1855
1856	SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1857	{
1858	return __sys_bind(fd, umyaddr, addrlen);
1859	}
1860
1861	/*
1862	* Perform a listen. Basically, we allow the protocol to do anything
1863	* necessary for a listen, and if that works, we mark the socket as
1864	* ready for listening.
1865	*/
1866
1867	int __sys_listen(int fd, int backlog)
1868	{
1869	struct socket *sock;
1870	int err, fput_needed;
1871	int somaxconn;
1872
1873	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
1874	if (sock) {
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
1883	fput_light(file: sock->file, fput_needed);
1884	}
1885	return err;
1886	}
1887
1888	SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1889	{
1890	return __sys_listen(fd, backlog);
1891	}
1892
1893	struct file *do_accept(struct file *file, unsigned file_flags,
1894	struct sockaddr __user *upeer_sockaddr,
1895	int __user *upeer_addrlen, int flags)
1896	{
1897	struct socket *sock, *newsock;
1898	struct file *newfile;
1899	int err, len;
1900	struct sockaddr_storage address;
1901	const struct proto_ops *ops;
1902
1903	sock = sock_from_file(file);
1904	if (!sock)
1905	return ERR_PTR(error: -ENOTSOCK);
1906
1907	newsock = sock_alloc();
1908	if (!newsock)
1909	return ERR_PTR(error: -ENFILE);
1910	ops = READ_ONCE(sock->ops);
1911
1912	newsock->type = sock->type;
1913	newsock->ops = ops;
1914
1915	/*
1916	* We don't need try_module_get here, as the listening socket (sock)
1917	* has the protocol module (sock->ops->owner) held.
1918	*/
1919	__module_get(module: ops->owner);
1920
1921	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1922	if (IS_ERR(ptr: newfile))
1923	return newfile;
1924
1925	err = security_socket_accept(sock, newsock);
1926	if (err)
1927	goto out_fd;
1928
1929	err = ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1930	false);
1931	if (err < 0)
1932	goto out_fd;
1933
1934	if (upeer_sockaddr) {
1935	len = ops->getname(newsock, (struct sockaddr *)&address, 2);
1936	if (len < 0) {
1937	err = -ECONNABORTED;
1938	goto out_fd;
1939	}
1940	err = move_addr_to_user(kaddr: &address,
1941	klen: len, uaddr: upeer_sockaddr, ulen: upeer_addrlen);
1942	if (err < 0)
1943	goto out_fd;
1944	}
1945
1946	/* File flags are not inherited via accept() unlike another OSes. */
1947	return newfile;
1948	out_fd:
1949	fput(newfile);
1950	return ERR_PTR(error: err);
1951	}
1952
1953	static int __sys_accept4_file(struct file *file, struct sockaddr __user *upeer_sockaddr,
1954	int __user *upeer_addrlen, int flags)
1955	{
1956	struct file *newfile;
1957	int newfd;
1958
1959	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1960	return -EINVAL;
1961
1962	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1963	flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1964
1965	newfd = get_unused_fd_flags(flags);
1966	if (unlikely(newfd < 0))
1967	return newfd;
1968
1969	newfile = do_accept(file, file_flags: 0, upeer_sockaddr, upeer_addrlen,
1970	flags);
1971	if (IS_ERR(ptr: newfile)) {
1972	put_unused_fd(fd: newfd);
1973	return PTR_ERR(ptr: newfile);
1974	}
1975	fd_install(fd: newfd, file: newfile);
1976	return newfd;
1977	}
1978
1979	/*
1980	* For accept, we attempt to create a new socket, set up the link
1981	* with the client, wake up the client, then return the new
1982	* connected fd. We collect the address of the connector in kernel
1983	* space and move it to user at the very end. This is unclean because
1984	* we open the socket then return an error.
1985	*
1986	* 1003.1g adds the ability to recvmsg() to query connection pending
1987	* status to recvmsg. We need to add that support in a way thats
1988	* clean when we restructure accept also.
1989	*/
1990
1991	int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1992	int __user *upeer_addrlen, int flags)
1993	{
1994	int ret = -EBADF;
1995	struct fd f;
1996
1997	f = fdget(fd);
1998	if (f.file) {
1999	ret = __sys_accept4_file(file: f.file, upeer_sockaddr,
2000	upeer_addrlen, flags);
2001	fdput(fd: f);
2002	}
2003
2004	return ret;
2005	}
2006
2007	SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
2008	int __user *, upeer_addrlen, int, flags)
2009	{
2010	return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
2011	}
2012
2013	SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
2014	int __user *, upeer_addrlen)
2015	{
2016	return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags: 0);
2017	}
2018
2019	/*
2020	* Attempt to connect to a socket with the server address. The address
2021	* is in user space so we verify it is OK and move it to kernel space.
2022	*
2023	* For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
2024	* break bindings
2025	*
2026	* NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
2027	* other SEQPACKET protocols that take time to connect() as it doesn't
2028	* include the -EINPROGRESS status for such sockets.
2029	*/
2030
2031	int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
2032	int addrlen, int file_flags)
2033	{
2034	struct socket *sock;
2035	int err;
2036
2037	sock = sock_from_file(file);
2038	if (!sock) {
2039	err = -ENOTSOCK;
2040	goto out;
2041	}
2042
2043	err =
2044	security_socket_connect(sock, address: (struct sockaddr *)address, addrlen);
2045	if (err)
2046	goto out;
2047
2048	err = READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)address,
2049	addrlen, sock->file->f_flags | file_flags);
2050	out:
2051	return err;
2052	}
2053
2054	int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
2055	{
2056	int ret = -EBADF;
2057	struct fd f;
2058
2059	f = fdget(fd);
2060	if (f.file) {
2061	struct sockaddr_storage address;
2062
2063	ret = move_addr_to_kernel(uaddr: uservaddr, ulen: addrlen, kaddr: &address);
2064	if (!ret)
2065	ret = __sys_connect_file(file: f.file, address: &address, addrlen, file_flags: 0);
2066	fdput(fd: f);
2067	}
2068
2069	return ret;
2070	}
2071
2072	SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
2073	int, addrlen)
2074	{
2075	return __sys_connect(fd, uservaddr, addrlen);
2076	}
2077
2078	/*
2079	* Get the local address ('name') of a socket object. Move the obtained
2080	* name to user space.
2081	*/
2082
2083	int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
2084	int __user *usockaddr_len)
2085	{
2086	struct socket *sock;
2087	struct sockaddr_storage address;
2088	int err, fput_needed;
2089
2090	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2091	if (!sock)
2092	goto out;
2093
2094	err = security_socket_getsockname(sock);
2095	if (err)
2096	goto out_put;
2097
2098	err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 0);
2099	if (err < 0)
2100	goto out_put;
2101	/* "err" is actually length in this case */
2102	err = move_addr_to_user(kaddr: &address, klen: err, uaddr: usockaddr, ulen: usockaddr_len);
2103
2104	out_put:
2105	fput_light(file: sock->file, fput_needed);
2106	out:
2107	return err;
2108	}
2109
2110	SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
2111	int __user *, usockaddr_len)
2112	{
2113	return __sys_getsockname(fd, usockaddr, usockaddr_len);
2114	}
2115
2116	/*
2117	* Get the remote address ('name') of a socket object. Move the obtained
2118	* name to user space.
2119	*/
2120
2121	int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
2122	int __user *usockaddr_len)
2123	{
2124	struct socket *sock;
2125	struct sockaddr_storage address;
2126	int err, fput_needed;
2127
2128	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2129	if (sock != NULL) {
2130	const struct proto_ops *ops = READ_ONCE(sock->ops);
2131
2132	err = security_socket_getpeername(sock);
2133	if (err) {
2134	fput_light(file: sock->file, fput_needed);
2135	return err;
2136	}
2137
2138	err = ops->getname(sock, (struct sockaddr *)&address, 1);
2139	if (err >= 0)
2140	/* "err" is actually length in this case */
2141	err = move_addr_to_user(kaddr: &address, klen: err, uaddr: usockaddr,
2142	ulen: usockaddr_len);
2143	fput_light(file: sock->file, fput_needed);
2144	}
2145	return err;
2146	}
2147
2148	SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
2149	int __user *, usockaddr_len)
2150	{
2151	return __sys_getpeername(fd, usockaddr, usockaddr_len);
2152	}
2153
2154	/*
2155	* Send a datagram to a given address. We move the address into kernel
2156	* space and check the user space data area is readable before invoking
2157	* the protocol.
2158	*/
2159	int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
2160	struct sockaddr __user *addr, int addr_len)
2161	{
2162	struct socket *sock;
2163	struct sockaddr_storage address;
2164	int err;
2165	struct msghdr msg;
2166	int fput_needed;
2167
2168	err = import_ubuf(ITER_SOURCE, buf: buff, len, i: &msg.msg_iter);
2169	if (unlikely(err))
2170	return err;
2171	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2172	if (!sock)
2173	goto out;
2174
2175	msg.msg_name = NULL;
2176	msg.msg_control = NULL;
2177	msg.msg_controllen = 0;
2178	msg.msg_namelen = 0;
2179	msg.msg_ubuf = NULL;
2180	if (addr) {
2181	err = move_addr_to_kernel(uaddr: addr, ulen: addr_len, kaddr: &address);
2182	if (err < 0)
2183	goto out_put;
2184	msg.msg_name = (struct sockaddr *)&address;
2185	msg.msg_namelen = addr_len;
2186	}
2187	flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
2188	if (sock->file->f_flags & O_NONBLOCK)
2189	flags |= MSG_DONTWAIT;
2190	msg.msg_flags = flags;
2191	err = __sock_sendmsg(sock, msg: &msg);
2192
2193	out_put:
2194	fput_light(file: sock->file, fput_needed);
2195	out:
2196	return err;
2197	}
2198
2199	SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
2200	unsigned int, flags, struct sockaddr __user *, addr,
2201	int, addr_len)
2202	{
2203	return __sys_sendto(fd, buff, len, flags, addr, addr_len);
2204	}
2205
2206	/*
2207	* Send a datagram down a socket.
2208	*/
2209
2210	SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
2211	unsigned int, flags)
2212	{
2213	return __sys_sendto(fd, buff, len, flags, NULL, addr_len: 0);
2214	}
2215
2216	/*
2217	* Receive a frame from the socket and optionally record the address of the
2218	* sender. We verify the buffers are writable and if needed move the
2219	* sender address from kernel to user space.
2220	*/
2221	int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2222	struct sockaddr __user *addr, int __user *addr_len)
2223	{
2224	struct sockaddr_storage address;
2225	struct msghdr msg = {
2226	/* Save some cycles and don't copy the address if not needed */
2227	.msg_name = addr ? (struct sockaddr *)&address : NULL,
2228	};
2229	struct socket *sock;
2230	int err, err2;
2231	int fput_needed;
2232
2233	err = import_ubuf(ITER_DEST, buf: ubuf, len: size, i: &msg.msg_iter);
2234	if (unlikely(err))
2235	return err;
2236	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2237	if (!sock)
2238	goto out;
2239
2240	if (sock->file->f_flags & O_NONBLOCK)
2241	flags |= MSG_DONTWAIT;
2242	err = sock_recvmsg(sock, &msg, flags);
2243
2244	if (err >= 0 && addr != NULL) {
2245	err2 = move_addr_to_user(kaddr: &address,
2246	klen: msg.msg_namelen, uaddr: addr, ulen: addr_len);
2247	if (err2 < 0)
2248	err = err2;
2249	}
2250
2251	fput_light(file: sock->file, fput_needed);
2252	out:
2253	return err;
2254	}
2255
2256	SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2257	unsigned int, flags, struct sockaddr __user *, addr,
2258	int __user *, addr_len)
2259	{
2260	return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2261	}
2262
2263	/*
2264	* Receive a datagram from a socket.
2265	*/
2266
2267	SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2268	unsigned int, flags)
2269	{
2270	return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
2271	}
2272
2273	static bool sock_use_custom_sol_socket(const struct socket *sock)
2274	{
2275	return test_bit(SOCK_CUSTOM_SOCKOPT, &sock->flags);
2276	}
2277
2278	int do_sock_setsockopt(struct socket *sock, bool compat, int level,
2279	int optname, sockptr_t optval, int optlen)
2280	{
2281	const struct proto_ops *ops;
2282	char *kernel_optval = NULL;
2283	int err;
2284
2285	if (optlen < 0)
2286	return -EINVAL;
2287
2288	err = security_socket_setsockopt(sock, level, optname);
2289	if (err)
2290	goto out_put;
2291
2292	if (!compat)
2293	err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
2294	optval, &optlen,
2295	&kernel_optval);
2296	if (err < 0)
2297	goto out_put;
2298	if (err > 0) {
2299	err = 0;
2300	goto out_put;
2301	}
2302
2303	if (kernel_optval)
2304	optval = KERNEL_SOCKPTR(p: kernel_optval);
2305	ops = READ_ONCE(sock->ops);
2306	if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
2307	err = sock_setsockopt(sock, level, op: optname, optval, optlen);
2308	else if (unlikely(!ops->setsockopt))
2309	err = -EOPNOTSUPP;
2310	else
2311	err = ops->setsockopt(sock, level, optname, optval,
2312	optlen);
2313	kfree(objp: kernel_optval);
2314	out_put:
2315	return err;
2316	}
2317	EXPORT_SYMBOL(do_sock_setsockopt);
2318
2319	/* Set a socket option. Because we don't know the option lengths we have
2320	* to pass the user mode parameter for the protocols to sort out.
2321	*/
2322	int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
2323	int optlen)
2324	{
2325	sockptr_t optval = USER_SOCKPTR(p: user_optval);
2326	bool compat = in_compat_syscall();
2327	int err, fput_needed;
2328	struct socket *sock;
2329
2330	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2331	if (!sock)
2332	return err;
2333
2334	err = do_sock_setsockopt(sock, compat, level, optname, optval, optlen);
2335
2336	fput_light(file: sock->file, fput_needed);
2337	return err;
2338	}
2339
2340	SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2341	char __user *, optval, int, optlen)
2342	{
2343	return __sys_setsockopt(fd, level, optname, user_optval: optval, optlen);
2344	}
2345
2346	INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
2347	int optname));
2348
2349	int do_sock_getsockopt(struct socket *sock, bool compat, int level,
2350	int optname, sockptr_t optval, sockptr_t optlen)
2351	{
2352	int max_optlen __maybe_unused;
2353	const struct proto_ops *ops;
2354	int err;
2355
2356	err = security_socket_getsockopt(sock, level, optname);
2357	if (err)
2358	return err;
2359
2360	if (!compat)
2361	max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
2362
2363	ops = READ_ONCE(sock->ops);
2364	if (level == SOL_SOCKET) {
2365	err = sk_getsockopt(sk: sock->sk, level, optname, optval, optlen);
2366	} else if (unlikely(!ops->getsockopt)) {
2367	err = -EOPNOTSUPP;
2368	} else {
2369	if (WARN_ONCE(optval.is_kernel || optlen.is_kernel,
2370	"Invalid argument type"))
2371	return -EOPNOTSUPP;
2372
2373	err = ops->getsockopt(sock, level, optname, optval.user,
2374	optlen.user);
2375	}
2376
2377	if (!compat)
2378	err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2379	optval, optlen, max_optlen,
2380	err);
2381
2382	return err;
2383	}
2384	EXPORT_SYMBOL(do_sock_getsockopt);
2385
2386	/*
2387	* Get a socket option. Because we don't know the option lengths we have
2388	* to pass a user mode parameter for the protocols to sort out.
2389	*/
2390	int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
2391	int __user *optlen)
2392	{
2393	int err, fput_needed;
2394	struct socket *sock;
2395	bool compat;
2396
2397	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2398	if (!sock)
2399	return err;
2400
2401	compat = in_compat_syscall();
2402	err = do_sock_getsockopt(sock, compat, level, optname,
2403	USER_SOCKPTR(p: optval), USER_SOCKPTR(p: optlen));
2404
2405	fput_light(file: sock->file, fput_needed);
2406	return err;
2407	}
2408
2409	SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2410	char __user *, optval, int __user *, optlen)
2411	{
2412	return __sys_getsockopt(fd, level, optname, optval, optlen);
2413	}
2414
2415	/*
2416	* Shutdown a socket.
2417	*/
2418
2419	int __sys_shutdown_sock(struct socket *sock, int how)
2420	{
2421	int err;
2422
2423	err = security_socket_shutdown(sock, how);
2424	if (!err)
2425	err = READ_ONCE(sock->ops)->shutdown(sock, how);
2426
2427	return err;
2428	}
2429
2430	int __sys_shutdown(int fd, int how)
2431	{
2432	int err, fput_needed;
2433	struct socket *sock;
2434
2435	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2436	if (sock != NULL) {
2437	err = __sys_shutdown_sock(sock, how);
2438	fput_light(file: sock->file, fput_needed);
2439	}
2440	return err;
2441	}
2442
2443	SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2444	{
2445	return __sys_shutdown(fd, how);
2446	}
2447
2448	/* A couple of helpful macros for getting the address of the 32/64 bit
2449	* fields which are the same type (int / unsigned) on our platforms.
2450	*/
2451	#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2452	#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2453	#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2454
2455	struct used_address {
2456	struct sockaddr_storage name;
2457	unsigned int name_len;
2458	};
2459
2460	int __copy_msghdr(struct msghdr *kmsg,
2461	struct user_msghdr *msg,
2462	struct sockaddr __user **save_addr)
2463	{
2464	ssize_t err;
2465
2466	kmsg->msg_control_is_user = true;
2467	kmsg->msg_get_inq = 0;
2468	kmsg->msg_control_user = msg->msg_control;
2469	kmsg->msg_controllen = msg->msg_controllen;
2470	kmsg->msg_flags = msg->msg_flags;
2471
2472	kmsg->msg_namelen = msg->msg_namelen;
2473	if (!msg->msg_name)
2474	kmsg->msg_namelen = 0;
2475
2476	if (kmsg->msg_namelen < 0)
2477	return -EINVAL;
2478
2479	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
2480	kmsg->msg_namelen = sizeof(struct sockaddr_storage);
2481
2482	if (save_addr)
2483	*save_addr = msg->msg_name;
2484
2485	if (msg->msg_name && kmsg->msg_namelen) {
2486	if (!save_addr) {
2487	err = move_addr_to_kernel(uaddr: msg->msg_name,
2488	ulen: kmsg->msg_namelen,
2489	kaddr: kmsg->msg_name);
2490	if (err < 0)
2491	return err;
2492	}
2493	} else {
2494	kmsg->msg_name = NULL;
2495	kmsg->msg_namelen = 0;
2496	}
2497
2498	if (msg->msg_iovlen > UIO_MAXIOV)
2499	return -EMSGSIZE;
2500
2501	kmsg->msg_iocb = NULL;
2502	kmsg->msg_ubuf = NULL;
2503	return 0;
2504	}
2505
2506	static int copy_msghdr_from_user(struct msghdr *kmsg,
2507	struct user_msghdr __user *umsg,
2508	struct sockaddr __user **save_addr,
2509	struct iovec **iov)
2510	{
2511	struct user_msghdr msg;
2512	ssize_t err;
2513
2514	if (copy_from_user(to: &msg, from: umsg, n: sizeof(*umsg)))
2515	return -EFAULT;
2516
2517	err = __copy_msghdr(kmsg, msg: &msg, save_addr);
2518	if (err)
2519	return err;
2520
2521	err = import_iovec(type: save_addr ? ITER_DEST : ITER_SOURCE,
2522	uvec: msg.msg_iov, nr_segs: msg.msg_iovlen,
2523	UIO_FASTIOV, iovp: iov, i: &kmsg->msg_iter);
2524	return err < 0 ? err : 0;
2525	}
2526
2527	static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
2528	unsigned int flags, struct used_address *used_address,
2529	unsigned int allowed_msghdr_flags)
2530	{
2531	unsigned char ctl[sizeof(struct cmsghdr) + 20]
2532	__aligned(sizeof(__kernel_size_t));
2533	/* 20 is size of ipv6_pktinfo */
2534	unsigned char *ctl_buf = ctl;
2535	int ctl_len;
2536	ssize_t err;
2537
2538	err = -ENOBUFS;
2539
2540	if (msg_sys->msg_controllen > INT_MAX)
2541	goto out;
2542	flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
2543	ctl_len = msg_sys->msg_controllen;
2544	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2545	err =
2546	cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2547	sizeof(ctl));
2548	if (err)
2549	goto out;
2550	ctl_buf = msg_sys->msg_control;
2551	ctl_len = msg_sys->msg_controllen;
2552	} else if (ctl_len) {
2553	BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2554	CMSG_ALIGN(sizeof(struct cmsghdr)));
2555	if (ctl_len > sizeof(ctl)) {
2556	ctl_buf = sock_kmalloc(sk: sock->sk, size: ctl_len, GFP_KERNEL);
2557	if (ctl_buf == NULL)
2558	goto out;
2559	}
2560	err = -EFAULT;
2561	if (copy_from_user(to: ctl_buf, from: msg_sys->msg_control_user, n: ctl_len))
2562	goto out_freectl;
2563	msg_sys->msg_control = ctl_buf;
2564	msg_sys->msg_control_is_user = false;
2565	}
2566	flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
2567	msg_sys->msg_flags = flags;
2568
2569	if (sock->file->f_flags & O_NONBLOCK)
2570	msg_sys->msg_flags |= MSG_DONTWAIT;
2571	/*
2572	* If this is sendmmsg() and current destination address is same as
2573	* previously succeeded address, omit asking LSM's decision.
2574	* used_address->name_len is initialized to UINT_MAX so that the first
2575	* destination address never matches.
2576	*/
2577	if (used_address && msg_sys->msg_name &&
2578	used_address->name_len == msg_sys->msg_namelen &&
2579	!memcmp(p: &used_address->name, q: msg_sys->msg_name,
2580	size: used_address->name_len)) {
2581	err = sock_sendmsg_nosec(sock, msg: msg_sys);
2582	goto out_freectl;
2583	}
2584	err = __sock_sendmsg(sock, msg: msg_sys);
2585	/*
2586	* If this is sendmmsg() and sending to current destination address was
2587	* successful, remember it.
2588	*/
2589	if (used_address && err >= 0) {
2590	used_address->name_len = msg_sys->msg_namelen;
2591	if (msg_sys->msg_name)
2592	memcpy(&used_address->name, msg_sys->msg_name,
2593	used_address->name_len);
2594	}
2595
2596	out_freectl:
2597	if (ctl_buf != ctl)
2598	sock_kfree_s(sk: sock->sk, mem: ctl_buf, size: ctl_len);
2599	out:
2600	return err;
2601	}
2602
2603	static int sendmsg_copy_msghdr(struct msghdr *msg,
2604	struct user_msghdr __user *umsg, unsigned flags,
2605	struct iovec **iov)
2606	{
2607	int err;
2608
2609	if (flags & MSG_CMSG_COMPAT) {
2610	struct compat_msghdr __user *msg_compat;
2611
2612	msg_compat = (struct compat_msghdr __user *) umsg;
2613	err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2614	} else {
2615	err = copy_msghdr_from_user(kmsg: msg, umsg, NULL, iov);
2616	}
2617	if (err < 0)
2618	return err;
2619
2620	return 0;
2621	}
2622
2623	static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
2624	struct msghdr *msg_sys, unsigned int flags,
2625	struct used_address *used_address,
2626	unsigned int allowed_msghdr_flags)
2627	{
2628	struct sockaddr_storage address;
2629	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2630	ssize_t err;
2631
2632	msg_sys->msg_name = &address;
2633
2634	err = sendmsg_copy_msghdr(msg: msg_sys, umsg: msg, flags, iov: &iov);
2635	if (err < 0)
2636	return err;
2637
2638	err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2639	allowed_msghdr_flags);
2640	kfree(objp: iov);
2641	return err;
2642	}
2643
2644	/*
2645	* BSD sendmsg interface
2646	*/
2647	long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
2648	unsigned int flags)
2649	{
2650	return ____sys_sendmsg(sock, msg_sys: msg, flags, NULL, allowed_msghdr_flags: 0);
2651	}
2652
2653	long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2654	bool forbid_cmsg_compat)
2655	{
2656	int fput_needed, err;
2657	struct msghdr msg_sys;
2658	struct socket *sock;
2659
2660	if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2661	return -EINVAL;
2662
2663	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2664	if (!sock)
2665	goto out;
2666
2667	err = ___sys_sendmsg(sock, msg, msg_sys: &msg_sys, flags, NULL, allowed_msghdr_flags: 0);
2668
2669	fput_light(file: sock->file, fput_needed);
2670	out:
2671	return err;
2672	}
2673
2674	SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
2675	{
2676	return __sys_sendmsg(fd, msg, flags, forbid_cmsg_compat: true);
2677	}
2678
2679	/*
2680	* Linux sendmmsg interface
2681	*/
2682
2683	int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2684	unsigned int flags, bool forbid_cmsg_compat)
2685	{
2686	int fput_needed, err, datagrams;
2687	struct socket *sock;
2688	struct mmsghdr __user *entry;
2689	struct compat_mmsghdr __user *compat_entry;
2690	struct msghdr msg_sys;
2691	struct used_address used_address;
2692	unsigned int oflags = flags;
2693
2694	if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2695	return -EINVAL;
2696
2697	if (vlen > UIO_MAXIOV)
2698	vlen = UIO_MAXIOV;
2699
2700	datagrams = 0;
2701
2702	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2703	if (!sock)
2704	return err;
2705
2706	used_address.name_len = UINT_MAX;
2707	entry = mmsg;
2708	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2709	err = 0;
2710	flags |= MSG_BATCH;
2711
2712	while (datagrams < vlen) {
2713	if (datagrams == vlen - 1)
2714	flags = oflags;
2715
2716	if (MSG_CMSG_COMPAT & flags) {
2717	err = ___sys_sendmsg(sock, msg: (struct user_msghdr __user *)compat_entry,
2718	msg_sys: &msg_sys, flags, used_address: &used_address, MSG_EOR);
2719	if (err < 0)
2720	break;
2721	err = __put_user(err, &compat_entry->msg_len);
2722	++compat_entry;
2723	} else {
2724	err = ___sys_sendmsg(sock,
2725	msg: (struct user_msghdr __user *)entry,
2726	msg_sys: &msg_sys, flags, used_address: &used_address, MSG_EOR);
2727	if (err < 0)
2728	break;
2729	err = put_user(err, &entry->msg_len);
2730	++entry;
2731	}
2732
2733	if (err)
2734	break;
2735	++datagrams;
2736	if (msg_data_left(msg: &msg_sys))
2737	break;
2738	cond_resched();
2739	}
2740
2741	fput_light(file: sock->file, fput_needed);
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, forbid_cmsg_compat: 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(kmsg: msg, umsg, save_addr: 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: 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(kaddr: &addr,
2811	klen: msg_sys->msg_namelen, uaddr,
2812	ulen: 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: msg_sys, umsg: msg, flags, uaddr: &uaddr, iov: &iov);
2842	if (err < 0)
2843	return err;
2844
2845	err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
2846	kfree(objp: 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_sys: msg, msg: umsg, uaddr, flags, nosec: 0);
2859	}
2860
2861	long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2862	bool forbid_cmsg_compat)
2863	{
2864	int fput_needed, err;
2865	struct msghdr msg_sys;
2866	struct socket *sock;
2867
2868	if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2869	return -EINVAL;
2870
2871	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2872	if (!sock)
2873	goto out;
2874
2875	err = ___sys_recvmsg(sock, msg, msg_sys: &msg_sys, flags, nosec: 0);
2876
2877	fput_light(file: sock->file, fput_needed);
2878	out:
2879	return err;
2880	}
2881
2882	SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
2883	unsigned int, flags)
2884	{
2885	return __sys_recvmsg(fd, msg, flags, forbid_cmsg_compat: true);
2886	}
2887
2888	/*
2889	* Linux recvmmsg interface
2890	*/
2891
2892	static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2893	unsigned int vlen, unsigned int flags,
2894	struct timespec64 *timeout)
2895	{
2896	int fput_needed, err, datagrams;
2897	struct socket *sock;
2898	struct mmsghdr __user *entry;
2899	struct compat_mmsghdr __user *compat_entry;
2900	struct msghdr msg_sys;
2901	struct timespec64 end_time;
2902	struct timespec64 timeout64;
2903
2904	if (timeout &&
2905	poll_select_set_timeout(to: &end_time, sec: timeout->tv_sec,
2906	nsec: timeout->tv_nsec))
2907	return -EINVAL;
2908
2909	datagrams = 0;
2910
2911	sock = sockfd_lookup_light(fd, err: &err, fput_needed: &fput_needed);
2912	if (!sock)
2913	return err;
2914
2915	if (likely(!(flags & MSG_ERRQUEUE))) {
2916	err = sock_error(sk: sock->sk);
2917	if (err) {
2918	datagrams = err;
2919	goto out_put;
2920	}
2921	}
2922
2923	entry = mmsg;
2924	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2925
2926	while (datagrams < vlen) {
2927	/*
2928	* No need to ask LSM for more than the first datagram.
2929	*/
2930	if (MSG_CMSG_COMPAT & flags) {
2931	err = ___sys_recvmsg(sock, msg: (struct user_msghdr __user *)compat_entry,
2932	msg_sys: &msg_sys, flags: flags & ~MSG_WAITFORONE,
2933	nosec: datagrams);
2934	if (err < 0)
2935	break;
2936	err = __put_user(err, &compat_entry->msg_len);
2937	++compat_entry;
2938	} else {
2939	err = ___sys_recvmsg(sock,
2940	msg: (struct user_msghdr __user *)entry,
2941	msg_sys: &msg_sys, flags: flags & ~MSG_WAITFORONE,
2942	nosec: datagrams);
2943	if (err < 0)
2944	break;
2945	err = put_user(err, &entry->msg_len);
2946	++entry;
2947	}
2948
2949	if (err)
2950	break;
2951	++datagrams;
2952
2953	/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2954	if (flags & MSG_WAITFORONE)
2955	flags |= MSG_DONTWAIT;
2956
2957	if (timeout) {
2958	ktime_get_ts64(ts: &timeout64);
2959	*timeout = timespec64_sub(lhs: end_time, rhs: timeout64);
2960	if (timeout->tv_sec < 0) {
2961	timeout->tv_sec = timeout->tv_nsec = 0;
2962	break;
2963	}
2964
2965	/* Timeout, return less than vlen datagrams */
2966	if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2967	break;
2968	}
2969
2970	/* Out of band data, return right away */
2971	if (msg_sys.msg_flags & MSG_OOB)
2972	break;
2973	cond_resched();
2974	}
2975
2976	if (err == 0)
2977	goto out_put;
2978
2979	if (datagrams == 0) {
2980	datagrams = err;
2981	goto out_put;
2982	}
2983
2984	/*
2985	* We may return less entries than requested (vlen) if the
2986	* sock is non block and there aren't enough datagrams...
2987	*/
2988	if (err != -EAGAIN) {
2989	/*
2990	* ... or if recvmsg returns an error after we
2991	* received some datagrams, where we record the
2992	* error to return on the next call or if the
2993	* app asks about it using getsockopt(SO_ERROR).
2994	*/
2995	WRITE_ONCE(sock->sk->sk_err, -err);
2996	}
2997	out_put:
2998	fput_light(file: sock->file, fput_needed);
2999
3000	return datagrams;
3001	}
3002
3003	int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
3004	unsigned int vlen, unsigned int flags,
3005	struct __kernel_timespec __user *timeout,
3006	struct old_timespec32 __user *timeout32)
3007	{
3008	int datagrams;
3009	struct timespec64 timeout_sys;
3010
3011	if (timeout && get_timespec64(ts: &timeout_sys, uts: timeout))
3012	return -EFAULT;
3013
3014	if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
3015	return -EFAULT;
3016
3017	if (!timeout && !timeout32)
3018	return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
3019
3020	datagrams = do_recvmmsg(fd, mmsg, vlen, flags, timeout: &timeout_sys);
3021
3022	if (datagrams <= 0)
3023	return datagrams;
3024
3025	if (timeout && put_timespec64(ts: &timeout_sys, uts: timeout))
3026	datagrams = -EFAULT;
3027
3028	if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
3029	datagrams = -EFAULT;
3030
3031	return datagrams;
3032	}
3033
3034	SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
3035	unsigned int, vlen, unsigned int, flags,
3036	struct __kernel_timespec __user *, timeout)
3037	{
3038	if (flags & MSG_CMSG_COMPAT)
3039	return -EINVAL;
3040
3041	return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
3042	}
3043
3044	#ifdef CONFIG_COMPAT_32BIT_TIME
3045	SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
3046	unsigned int, vlen, unsigned int, flags,
3047	struct old_timespec32 __user *, timeout)
3048	{
3049	if (flags & MSG_CMSG_COMPAT)
3050	return -EINVAL;
3051
3052	return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout32: timeout);
3053	}
3054	#endif
3055
3056	#ifdef __ARCH_WANT_SYS_SOCKETCALL
3057	/* Argument list sizes for sys_socketcall */
3058	#define AL(x) ((x) * sizeof(unsigned long))
3059	static const unsigned char nargs[21] = {
3060	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
3061	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
3062	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
3063	AL(4), AL(5), AL(4)
3064	};
3065
3066	#undef AL
3067
3068	/*
3069	* System call vectors.
3070	*
3071	* Argument checking cleaned up. Saved 20% in size.
3072	* This function doesn't need to set the kernel lock because
3073	* it is set by the callees.
3074	*/
3075
3076	SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
3077	{
3078	unsigned long a[AUDITSC_ARGS];
3079	unsigned long a0, a1;
3080	int err;
3081	unsigned int len;
3082
3083	if (call < 1 || call > SYS_SENDMMSG)
3084	return -EINVAL;
3085	call = array_index_nospec(call, SYS_SENDMMSG + 1);
3086
3087	len = nargs[call];
3088	if (len > sizeof(a))
3089	return -EINVAL;
3090
3091	/* copy_from_user should be SMP safe. */
3092	if (copy_from_user(to: a, from: args, n: len))
3093	return -EFAULT;
3094
3095	err = audit_socketcall(nargs: nargs[call] / sizeof(unsigned long), args: a);
3096	if (err)
3097	return err;
3098
3099	a0 = a[0];
3100	a1 = a[1];
3101
3102	switch (call) {
3103	case SYS_SOCKET:
3104	err = __sys_socket(family: a0, type: a1, protocol: a[2]);
3105	break;
3106	case SYS_BIND:
3107	err = __sys_bind(fd: a0, umyaddr: (struct sockaddr __user *)a1, addrlen: a[2]);
3108	break;
3109	case SYS_CONNECT:
3110	err = __sys_connect(fd: a0, uservaddr: (struct sockaddr __user *)a1, addrlen: a[2]);
3111	break;
3112	case SYS_LISTEN:
3113	err = __sys_listen(fd: a0, backlog: a1);
3114	break;
3115	case SYS_ACCEPT:
3116	err = __sys_accept4(fd: a0, upeer_sockaddr: (struct sockaddr __user *)a1,
3117	upeer_addrlen: (int __user *)a[2], flags: 0);
3118	break;
3119	case SYS_GETSOCKNAME:
3120	err =
3121	__sys_getsockname(fd: a0, usockaddr: (struct sockaddr __user *)a1,
3122	usockaddr_len: (int __user *)a[2]);
3123	break;
3124	case SYS_GETPEERNAME:
3125	err =
3126	__sys_getpeername(fd: a0, usockaddr: (struct sockaddr __user *)a1,
3127	usockaddr_len: (int __user *)a[2]);
3128	break;
3129	case SYS_SOCKETPAIR:
3130	err = __sys_socketpair(family: a0, type: a1, protocol: a[2], usockvec: (int __user *)a[3]);
3131	break;
3132	case SYS_SEND:
3133	err = __sys_sendto(fd: a0, buff: (void __user *)a1, len: a[2], flags: a[3],
3134	NULL, addr_len: 0);
3135	break;
3136	case SYS_SENDTO:
3137	err = __sys_sendto(fd: a0, buff: (void __user *)a1, len: a[2], flags: a[3],
3138	addr: (struct sockaddr __user *)a[4], addr_len: a[5]);
3139	break;
3140	case SYS_RECV:
3141	err = __sys_recvfrom(fd: a0, ubuf: (void __user *)a1, size: a[2], flags: a[3],
3142	NULL, NULL);
3143	break;
3144	case SYS_RECVFROM:
3145	err = __sys_recvfrom(fd: a0, ubuf: (void __user *)a1, size: a[2], flags: a[3],
3146	addr: (struct sockaddr __user *)a[4],
3147	addr_len: (int __user *)a[5]);
3148	break;
3149	case SYS_SHUTDOWN:
3150	err = __sys_shutdown(fd: a0, how: a1);
3151	break;
3152	case SYS_SETSOCKOPT:
3153	err = __sys_setsockopt(fd: a0, level: a1, optname: a[2], user_optval: (char __user *)a[3],
3154	optlen: a[4]);
3155	break;
3156	case SYS_GETSOCKOPT:
3157	err =
3158	__sys_getsockopt(fd: a0, level: a1, optname: a[2], optval: (char __user *)a[3],
3159	optlen: (int __user *)a[4]);
3160	break;
3161	case SYS_SENDMSG:
3162	err = __sys_sendmsg(fd: a0, msg: (struct user_msghdr __user *)a1,
3163	flags: a[2], forbid_cmsg_compat: true);
3164	break;
3165	case SYS_SENDMMSG:
3166	err = __sys_sendmmsg(fd: a0, mmsg: (struct mmsghdr __user *)a1, vlen: a[2],
3167	flags: a[3], forbid_cmsg_compat: true);
3168	break;
3169	case SYS_RECVMSG:
3170	err = __sys_recvmsg(fd: a0, msg: (struct user_msghdr __user *)a1,
3171	flags: a[2], forbid_cmsg_compat: true);
3172	break;
3173	case SYS_RECVMMSG:
3174	if (IS_ENABLED(CONFIG_64BIT))
3175	err = __sys_recvmmsg(fd: a0, mmsg: (struct mmsghdr __user *)a1,
3176	vlen: a[2], flags: a[3],
3177	timeout: (struct __kernel_timespec __user *)a[4],
3178	NULL);
3179	else
3180	err = __sys_recvmmsg(fd: a0, mmsg: (struct mmsghdr __user *)a1,
3181	vlen: a[2], flags: a[3], NULL,
3182	timeout32: (struct old_timespec32 __user *)a[4]);
3183	break;
3184	case SYS_ACCEPT4:
3185	err = __sys_accept4(fd: a0, upeer_sockaddr: (struct sockaddr __user *)a1,
3186	upeer_addrlen: (int __user *)a[2], flags: a[3]);
3187	break;
3188	default:
3189	err = -EINVAL;
3190	break;
3191	}
3192	return err;
3193	}
3194
3195	#endif /* __ARCH_WANT_SYS_SOCKETCALL */
3196
3197	/**
3198	* sock_register - add a socket protocol handler
3199	* @ops: description of protocol
3200	*
3201	* This function is called by a protocol handler that wants to
3202	* advertise its address family, and have it linked into the
3203	* socket interface. The value ops->family corresponds to the
3204	* socket system call protocol family.
3205	*/
3206	int sock_register(const struct net_proto_family *ops)
3207	{
3208	int err;
3209
3210	if (ops->family >= NPROTO) {
3211	pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
3212	return -ENOBUFS;
3213	}
3214
3215	spin_lock(lock: &net_family_lock);
3216	if (rcu_dereference_protected(net_families[ops->family],
3217	lockdep_is_held(&net_family_lock)))
3218	err = -EEXIST;
3219	else {
3220	rcu_assign_pointer(net_families[ops->family], ops);
3221	err = 0;
3222	}
3223	spin_unlock(lock: &net_family_lock);
3224
3225	pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]);
3226	return err;
3227	}
3228	EXPORT_SYMBOL(sock_register);
3229
3230	/**
3231	* sock_unregister - remove a protocol handler
3232	* @family: protocol family to remove
3233	*
3234	* This function is called by a protocol handler that wants to
3235	* remove its address family, and have it unlinked from the
3236	* new socket creation.
3237	*
3238	* If protocol handler is a module, then it can use module reference
3239	* counts to protect against new references. If protocol handler is not
3240	* a module then it needs to provide its own protection in
3241	* the ops->create routine.
3242	*/
3243	void sock_unregister(int family)
3244	{
3245	BUG_ON(family < 0 || family >= NPROTO);
3246
3247	spin_lock(lock: &net_family_lock);
3248	RCU_INIT_POINTER(net_families[family], NULL);
3249	spin_unlock(lock: &net_family_lock);
3250
3251	synchronize_rcu();
3252
3253	pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]);
3254	}
3255	EXPORT_SYMBOL(sock_unregister);
3256
3257	bool sock_is_registered(int family)
3258	{
3259	return family < NPROTO && rcu_access_pointer(net_families[family]);
3260	}
3261
3262	static int __init sock_init(void)
3263	{
3264	int err;
3265	/*
3266	* Initialize the network sysctl infrastructure.
3267	*/
3268	err = net_sysctl_init();
3269	if (err)
3270	goto out;
3271
3272	/*
3273	* Initialize skbuff SLAB cache
3274	*/
3275	skb_init();
3276
3277	/*
3278	* Initialize the protocols module.
3279	*/
3280
3281	init_inodecache();
3282
3283	err = register_filesystem(&sock_fs_type);
3284	if (err)
3285	goto out;
3286	sock_mnt = kern_mount(&sock_fs_type);
3287	if (IS_ERR(ptr: sock_mnt)) {
3288	err = PTR_ERR(ptr: sock_mnt);
3289	goto out_mount;
3290	}
3291
3292	/* The real protocol initialization is performed in later initcalls.
3293	*/
3294
3295	#ifdef CONFIG_NETFILTER
3296	err = netfilter_init();
3297	if (err)
3298	goto out;
3299	#endif
3300
3301	ptp_classifier_init();
3302
3303	out:
3304	return err;
3305
3306	out_mount:
3307	unregister_filesystem(&sock_fs_type);
3308	goto out;
3309	}
3310
3311	core_initcall(sock_init); /* early initcall */
3312
3313	#ifdef CONFIG_PROC_FS
3314	void socket_seq_show(struct seq_file *seq)
3315	{
3316	seq_printf(m: seq, fmt: "sockets: used %d\n",
3317	sock_inuse_get(net: seq->private));
3318	}
3319	#endif /* CONFIG_PROC_FS */
3320
3321	/* Handle the fact that while struct ifreq has the same *layout* on
3322	* 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3323	* which are handled elsewhere, it still has different *size* due to
3324	* ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3325	* resulting in struct ifreq being 32 and 40 bytes respectively).
3326	* As a result, if the struct happens to be at the end of a page and
3327	* the next page isn't readable/writable, we get a fault. To prevent
3328	* that, copy back and forth to the full size.
3329	*/
3330	int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg)
3331	{
3332	if (in_compat_syscall()) {
3333	struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr;
3334
3335	memset(ifr, 0, sizeof(*ifr));
3336	if (copy_from_user(to: ifr32, from: arg, n: sizeof(*ifr32)))
3337	return -EFAULT;
3338
3339	if (ifrdata)
3340	*ifrdata = compat_ptr(uptr: ifr32->ifr_data);
3341
3342	return 0;
3343	}
3344
3345	if (copy_from_user(to: ifr, from: arg, n: sizeof(*ifr)))
3346	return -EFAULT;
3347
3348	if (ifrdata)
3349	*ifrdata = ifr->ifr_data;
3350
3351	return 0;
3352	}
3353	EXPORT_SYMBOL(get_user_ifreq);
3354
3355	int put_user_ifreq(struct ifreq *ifr, void __user *arg)
3356	{
3357	size_t size = sizeof(*ifr);
3358
3359	if (in_compat_syscall())
3360	size = sizeof(struct compat_ifreq);
3361
3362	if (copy_to_user(to: arg, from: ifr, n: size))
3363	return -EFAULT;
3364
3365	return 0;
3366	}
3367	EXPORT_SYMBOL(put_user_ifreq);
3368
3369	#ifdef CONFIG_COMPAT
3370	static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3371	{
3372	compat_uptr_t uptr32;
3373	struct ifreq ifr;
3374	void __user *saved;
3375	int err;
3376
3377	if (get_user_ifreq(&ifr, NULL, uifr32))
3378	return -EFAULT;
3379
3380	if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3381	return -EFAULT;
3382
3383	saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3384	ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr: uptr32);
3385
3386	err = dev_ioctl(net, SIOCWANDEV, ifr: &ifr, NULL, NULL);
3387	if (!err) {
3388	ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
3389	if (put_user_ifreq(&ifr, uifr32))
3390	err = -EFAULT;
3391	}
3392	return err;
3393	}
3394
3395	/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3396	static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
3397	struct compat_ifreq __user *u_ifreq32)
3398	{
3399	struct ifreq ifreq;
3400	void __user *data;
3401
3402	if (!is_socket_ioctl_cmd(cmd))
3403	return -ENOTTY;
3404	if (get_user_ifreq(&ifreq, &data, u_ifreq32))
3405	return -EFAULT;
3406	ifreq.ifr_data = data;
3407
3408	return dev_ioctl(net, cmd, ifr: &ifreq, data, NULL);
3409	}
3410
3411	static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3412	unsigned int cmd, unsigned long arg)
3413	{
3414	void __user *argp = compat_ptr(uptr: arg);
3415	struct sock *sk = sock->sk;
3416	struct net *net = sock_net(sk);
3417	const struct proto_ops *ops;
3418
3419	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3420	return sock_ioctl(file, cmd, arg: (unsigned long)argp);
3421
3422	switch (cmd) {
3423	case SIOCWANDEV:
3424	return compat_siocwandev(net, uifr32: argp);
3425	case SIOCGSTAMP_OLD:
3426	case SIOCGSTAMPNS_OLD:
3427	ops = READ_ONCE(sock->ops);
3428	if (!ops->gettstamp)
3429	return -ENOIOCTLCMD;
3430	return ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
3431	!COMPAT_USE_64BIT_TIME);
3432
3433	case SIOCETHTOOL:
3434	case SIOCBONDSLAVEINFOQUERY:
3435	case SIOCBONDINFOQUERY:
3436	case SIOCSHWTSTAMP:
3437	case SIOCGHWTSTAMP:
3438	return compat_ifr_data_ioctl(net, cmd, u_ifreq32: argp);
3439
3440	case FIOSETOWN:
3441	case SIOCSPGRP:
3442	case FIOGETOWN:
3443	case SIOCGPGRP:
3444	case SIOCBRADDBR:
3445	case SIOCBRDELBR:
3446	case SIOCGIFVLAN:
3447	case SIOCSIFVLAN:
3448	case SIOCGSKNS:
3449	case SIOCGSTAMP_NEW:
3450	case SIOCGSTAMPNS_NEW:
3451	case SIOCGIFCONF:
3452	case SIOCSIFBR:
3453	case SIOCGIFBR:
3454	return sock_ioctl(file, cmd, arg);
3455
3456	case SIOCGIFFLAGS:
3457	case SIOCSIFFLAGS:
3458	case SIOCGIFMAP:
3459	case SIOCSIFMAP:
3460	case SIOCGIFMETRIC:
3461	case SIOCSIFMETRIC:
3462	case SIOCGIFMTU:
3463	case SIOCSIFMTU:
3464	case SIOCGIFMEM:
3465	case SIOCSIFMEM:
3466	case SIOCGIFHWADDR:
3467	case SIOCSIFHWADDR:
3468	case SIOCADDMULTI:
3469	case SIOCDELMULTI:
3470	case SIOCGIFINDEX:
3471	case SIOCGIFADDR:
3472	case SIOCSIFADDR:
3473	case SIOCSIFHWBROADCAST:
3474	case SIOCDIFADDR:
3475	case SIOCGIFBRDADDR:
3476	case SIOCSIFBRDADDR:
3477	case SIOCGIFDSTADDR:
3478	case SIOCSIFDSTADDR:
3479	case SIOCGIFNETMASK:
3480	case SIOCSIFNETMASK:
3481	case SIOCSIFPFLAGS:
3482	case SIOCGIFPFLAGS:
3483	case SIOCGIFTXQLEN:
3484	case SIOCSIFTXQLEN:
3485	case SIOCBRADDIF:
3486	case SIOCBRDELIF:
3487	case SIOCGIFNAME:
3488	case SIOCSIFNAME:
3489	case SIOCGMIIPHY:
3490	case SIOCGMIIREG:
3491	case SIOCSMIIREG:
3492	case SIOCBONDENSLAVE:
3493	case SIOCBONDRELEASE:
3494	case SIOCBONDSETHWADDR:
3495	case SIOCBONDCHANGEACTIVE:
3496	case SIOCSARP:
3497	case SIOCGARP:
3498	case SIOCDARP:
3499	case SIOCOUTQ:
3500	case SIOCOUTQNSD:
3501	case SIOCATMARK:
3502	return sock_do_ioctl(net, sock, cmd, arg);
3503	}
3504
3505	return -ENOIOCTLCMD;
3506	}
3507
3508	static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3509	unsigned long arg)
3510	{
3511	struct socket *sock = file->private_data;
3512	const struct proto_ops *ops = READ_ONCE(sock->ops);
3513	int ret = -ENOIOCTLCMD;
3514	struct sock *sk;
3515	struct net *net;
3516
3517	sk = sock->sk;
3518	net = sock_net(sk);
3519
3520	if (ops->compat_ioctl)
3521	ret = ops->compat_ioctl(sock, cmd, arg);
3522
3523	if (ret == -ENOIOCTLCMD &&
3524	(cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3525	ret = compat_wext_handle_ioctl(net, cmd, arg);
3526
3527	if (ret == -ENOIOCTLCMD)
3528	ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3529
3530	return ret;
3531	}
3532	#endif
3533
3534	/**
3535	* kernel_bind - bind an address to a socket (kernel space)
3536	* @sock: socket
3537	* @addr: address
3538	* @addrlen: length of address
3539	*
3540	* Returns 0 or an error.
3541	*/
3542
3543	int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3544	{
3545	struct sockaddr_storage address;
3546
3547	memcpy(&address, addr, addrlen);
3548
3549	return READ_ONCE(sock->ops)->bind(sock, (struct sockaddr *)&address,
3550	addrlen);
3551	}
3552	EXPORT_SYMBOL(kernel_bind);
3553
3554	/**
3555	* kernel_listen - move socket to listening state (kernel space)
3556	* @sock: socket
3557	* @backlog: pending connections queue size
3558	*
3559	* Returns 0 or an error.
3560	*/
3561
3562	int kernel_listen(struct socket *sock, int backlog)
3563	{
3564	return READ_ONCE(sock->ops)->listen(sock, backlog);
3565	}
3566	EXPORT_SYMBOL(kernel_listen);
3567
3568	/**
3569	* kernel_accept - accept a connection (kernel space)
3570	* @sock: listening socket
3571	* @newsock: new connected socket
3572	* @flags: flags
3573	*
3574	* @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3575	* If it fails, @newsock is guaranteed to be %NULL.
3576	* Returns 0 or an error.
3577	*/
3578
3579	int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3580	{
3581	struct sock *sk = sock->sk;
3582	const struct proto_ops *ops = READ_ONCE(sock->ops);
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, flags, true);
3591	if (err < 0) {
3592	sock_release(*newsock);
3593	*newsock = NULL;
3594	goto done;
3595	}
3596
3597	(*newsock)->ops = ops;
3598	__module_get(module: 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: 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);
3722